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 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 379 380 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 381 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 382 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 383 384 // -------------- Obsolete Flags - sorted by expired_in -------------- 385 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 386 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 387 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 388 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 389 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 390 391 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 392 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 393 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 394 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 395 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 396 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 397 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 398 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 399 #endif 400 401 { NULL, JDK_Version(0), JDK_Version(0) } 402 }; 403 404 // Flags that are aliases for other flags. 405 typedef struct { 406 const char* alias_name; 407 const char* real_name; 408 } AliasedFlag; 409 410 static AliasedFlag const aliased_jvm_flags[] = { 411 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 412 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 413 { NULL, NULL} 414 }; 415 416 // NOTE: A compatibility request will be necessary for each alias to be removed. 417 static AliasedLoggingFlag const aliased_logging_flags[] = { 418 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 419 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 420 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 421 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 422 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 423 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 424 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 425 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 426 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 427 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 428 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 429 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 430 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 431 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 432 }; 433 434 #ifndef PRODUCT 435 // These options are removed in jdk9. Remove this code for jdk10. 436 static AliasedFlag const removed_develop_logging_flags[] = { 437 { "TraceClassInitialization", "-Xlog:class+init" }, 438 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 439 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 440 { "TraceItables", "-Xlog:itables=debug" }, 441 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 442 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 443 { "TraceStartupTime", "-Xlog:startuptime" }, 444 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 445 { "PrintVtables", "-Xlog:vtables=debug" }, 446 { "VerboseVerification", "-Xlog:verification" }, 447 { NULL, NULL } 448 }; 449 #endif //PRODUCT 450 451 // Return true if "v" is less than "other", where "other" may be "undefined". 452 static bool version_less_than(JDK_Version v, JDK_Version other) { 453 assert(!v.is_undefined(), "must be defined"); 454 if (!other.is_undefined() && v.compare(other) >= 0) { 455 return false; 456 } else { 457 return true; 458 } 459 } 460 461 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 462 463 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 464 // Allow extensions to have priority 465 if (lookup_special_flag_ext(flag_name, flag)) { 466 return true; 467 } 468 469 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 470 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 471 flag = special_jvm_flags[i]; 472 return true; 473 } 474 } 475 return false; 476 } 477 478 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 479 assert(version != NULL, "Must provide a version buffer"); 480 SpecialFlag flag; 481 if (lookup_special_flag(flag_name, flag)) { 482 if (!flag.obsolete_in.is_undefined()) { 483 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 484 *version = flag.obsolete_in; 485 return true; 486 } 487 } 488 } 489 return false; 490 } 491 492 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 493 assert(version != NULL, "Must provide a version buffer"); 494 SpecialFlag flag; 495 if (lookup_special_flag(flag_name, flag)) { 496 if (!flag.deprecated_in.is_undefined()) { 497 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 498 version_less_than(JDK_Version::current(), flag.expired_in)) { 499 *version = flag.deprecated_in; 500 return 1; 501 } else { 502 return -1; 503 } 504 } 505 } 506 return 0; 507 } 508 509 #ifndef PRODUCT 510 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 511 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 512 const AliasedFlag& flag = removed_develop_logging_flags[i]; 513 if (strcmp(flag.alias_name, name) == 0) { 514 return flag.real_name; 515 } 516 } 517 return NULL; 518 } 519 #endif // PRODUCT 520 521 const char* Arguments::real_flag_name(const char *flag_name) { 522 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 523 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 524 if (strcmp(flag_status.alias_name, flag_name) == 0) { 525 return flag_status.real_name; 526 } 527 } 528 return flag_name; 529 } 530 531 #ifdef ASSERT 532 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 533 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 534 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 535 return true; 536 } 537 } 538 return false; 539 } 540 541 static bool verify_special_jvm_flags() { 542 bool success = true; 543 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 544 const SpecialFlag& flag = special_jvm_flags[i]; 545 if (lookup_special_flag(flag.name, i)) { 546 warning("Duplicate special flag declaration \"%s\"", flag.name); 547 success = false; 548 } 549 if (flag.deprecated_in.is_undefined() && 550 flag.obsolete_in.is_undefined()) { 551 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 552 success = false; 553 } 554 555 if (!flag.deprecated_in.is_undefined()) { 556 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 557 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 558 success = false; 559 } 560 561 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 562 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 563 success = false; 564 } 565 } 566 567 if (!flag.obsolete_in.is_undefined()) { 568 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 569 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 570 success = false; 571 } 572 573 // if flag has become obsolete it should not have a "globals" flag defined anymore. 574 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 575 if (Flag::find_flag(flag.name) != NULL) { 576 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 577 success = false; 578 } 579 } 580 } 581 582 if (!flag.expired_in.is_undefined()) { 583 // if flag has become expired it should not have a "globals" flag defined anymore. 584 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 585 if (Flag::find_flag(flag.name) != NULL) { 586 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 587 success = false; 588 } 589 } 590 } 591 592 } 593 return success; 594 } 595 #endif 596 597 // Parses a size specification string. 598 bool Arguments::atojulong(const char *s, julong* result) { 599 julong n = 0; 600 601 // First char must be a digit. Don't allow negative numbers or leading spaces. 602 if (!isdigit(*s)) { 603 return false; 604 } 605 606 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 607 char* remainder; 608 errno = 0; 609 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 610 if (errno != 0) { 611 return false; 612 } 613 614 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 615 if (remainder == s || strlen(remainder) > 1) { 616 return false; 617 } 618 619 switch (*remainder) { 620 case 'T': case 't': 621 *result = n * G * K; 622 // Check for overflow. 623 if (*result/((julong)G * K) != n) return false; 624 return true; 625 case 'G': case 'g': 626 *result = n * G; 627 if (*result/G != n) return false; 628 return true; 629 case 'M': case 'm': 630 *result = n * M; 631 if (*result/M != n) return false; 632 return true; 633 case 'K': case 'k': 634 *result = n * K; 635 if (*result/K != n) return false; 636 return true; 637 case '\0': 638 *result = n; 639 return true; 640 default: 641 return false; 642 } 643 } 644 645 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 646 if (size < min_size) return arg_too_small; 647 // Check that size will fit in a size_t (only relevant on 32-bit) 648 if (size > max_uintx) return arg_too_big; 649 return arg_in_range; 650 } 651 652 // Describe an argument out of range error 653 void Arguments::describe_range_error(ArgsRange errcode) { 654 switch(errcode) { 655 case arg_too_big: 656 jio_fprintf(defaultStream::error_stream(), 657 "The specified size exceeds the maximum " 658 "representable size.\n"); 659 break; 660 case arg_too_small: 661 case arg_unreadable: 662 case arg_in_range: 663 // do nothing for now 664 break; 665 default: 666 ShouldNotReachHere(); 667 } 668 } 669 670 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 671 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 672 return true; 673 } else { 674 return false; 675 } 676 } 677 678 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 679 char* end; 680 errno = 0; 681 double v = strtod(value, &end); 682 if ((errno != 0) || (*end != 0)) { 683 return false; 684 } 685 686 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 687 return true; 688 } 689 return false; 690 } 691 692 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 693 julong v; 694 int int_v; 695 intx intx_v; 696 bool is_neg = false; 697 Flag* result = Flag::find_flag(name, strlen(name)); 698 699 if (result == NULL) { 700 return false; 701 } 702 703 // Check the sign first since atojulong() parses only unsigned values. 704 if (*value == '-') { 705 if (!result->is_intx() && !result->is_int()) { 706 return false; 707 } 708 value++; 709 is_neg = true; 710 } 711 if (!Arguments::atojulong(value, &v)) { 712 return false; 713 } 714 if (result->is_int()) { 715 int_v = (int) v; 716 if (is_neg) { 717 int_v = -int_v; 718 } 719 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 720 } else if (result->is_uint()) { 721 uint uint_v = (uint) v; 722 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 723 } else if (result->is_intx()) { 724 intx_v = (intx) v; 725 if (is_neg) { 726 intx_v = -intx_v; 727 } 728 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 729 } else if (result->is_uintx()) { 730 uintx uintx_v = (uintx) v; 731 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 732 } else if (result->is_uint64_t()) { 733 uint64_t uint64_t_v = (uint64_t) v; 734 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 735 } else if (result->is_size_t()) { 736 size_t size_t_v = (size_t) v; 737 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 738 } else if (result->is_double()) { 739 double double_v = (double) v; 740 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS; 741 } else { 742 return false; 743 } 744 } 745 746 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 747 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 748 // Contract: CommandLineFlags always returns a pointer that needs freeing. 749 FREE_C_HEAP_ARRAY(char, value); 750 return true; 751 } 752 753 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 754 const char* old_value = ""; 755 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 756 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 757 size_t new_len = strlen(new_value); 758 const char* value; 759 char* free_this_too = NULL; 760 if (old_len == 0) { 761 value = new_value; 762 } else if (new_len == 0) { 763 value = old_value; 764 } else { 765 size_t length = old_len + 1 + new_len + 1; 766 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 767 // each new setting adds another LINE to the switch: 768 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 769 value = buf; 770 free_this_too = buf; 771 } 772 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 773 // CommandLineFlags always returns a pointer that needs freeing. 774 FREE_C_HEAP_ARRAY(char, value); 775 if (free_this_too != NULL) { 776 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 777 FREE_C_HEAP_ARRAY(char, free_this_too); 778 } 779 return true; 780 } 781 782 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 783 const char* real_name = real_flag_name(arg); 784 JDK_Version since = JDK_Version(); 785 switch (is_deprecated_flag(arg, &since)) { 786 case -1: 787 return NULL; // obsolete or expired, don't process normally 788 case 0: 789 return real_name; 790 case 1: { 791 if (warn) { 792 char version[256]; 793 since.to_string(version, sizeof(version)); 794 if (real_name != arg) { 795 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 796 arg, version, real_name); 797 } else { 798 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 799 arg, version); 800 } 801 } 802 return real_name; 803 } 804 } 805 ShouldNotReachHere(); 806 return NULL; 807 } 808 809 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 810 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 811 // Set tagset string buffer at max size of 256, large enough for any alias tagset 812 const int max_tagset_size = 256; 813 int max_tagset_len = max_tagset_size - 1; 814 char tagset_buffer[max_tagset_size]; 815 tagset_buffer[0] = '\0'; 816 817 // Write tag-set for aliased logging option, in string list form 818 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 819 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 820 if (i > 0) { 821 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 822 } 823 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 824 } 825 if (!alf.exactMatch) { 826 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 827 } 828 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 829 (on) ? "+" : "-", 830 name, 831 tagset_buffer, 832 (on) ? LogLevel::name(alf.level) : "off"); 833 } 834 835 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 836 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 837 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 838 if (strcmp(alf.alias_name, name) == 0) { 839 log_deprecated_flag(name, on, alf); 840 return alf; 841 } 842 } 843 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 844 return a; 845 } 846 847 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 848 849 // range of acceptable characters spelled out for portability reasons 850 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 851 #define BUFLEN 255 852 char name[BUFLEN+1]; 853 char dummy; 854 const char* real_name; 855 bool warn_if_deprecated = true; 856 857 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 858 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 859 if (alf.alias_name != NULL){ 860 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 861 return true; 862 } 863 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 864 if (real_name == NULL) { 865 return false; 866 } 867 return set_bool_flag(real_name, false, origin); 868 } 869 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 870 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 871 if (alf.alias_name != NULL){ 872 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 873 return true; 874 } 875 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 876 if (real_name == NULL) { 877 return false; 878 } 879 return set_bool_flag(real_name, true, origin); 880 } 881 882 char punct; 883 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 884 const char* value = strchr(arg, '=') + 1; 885 Flag* flag; 886 887 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 888 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 889 if (alf.alias_name != NULL) { 890 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 891 return true; 892 } 893 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 894 if (real_name == NULL) { 895 return false; 896 } 897 flag = Flag::find_flag(real_name); 898 if (flag != NULL && flag->is_ccstr()) { 899 if (flag->ccstr_accumulates()) { 900 return append_to_string_flag(real_name, value, origin); 901 } else { 902 if (value[0] == '\0') { 903 value = NULL; 904 } 905 return set_string_flag(real_name, value, origin); 906 } 907 } else { 908 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 909 } 910 } 911 912 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 913 const char* value = strchr(arg, '=') + 1; 914 // -XX:Foo:=xxx will reset the string flag to the given value. 915 if (value[0] == '\0') { 916 value = NULL; 917 } 918 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 919 if (real_name == NULL) { 920 return false; 921 } 922 return set_string_flag(real_name, value, origin); 923 } 924 925 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 926 #define SIGNED_NUMBER_RANGE "[-0123456789]" 927 #define NUMBER_RANGE "[0123456789eE+-]" 928 char value[BUFLEN + 1]; 929 char value2[BUFLEN + 1]; 930 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 931 // Looks like a floating-point number -- try again with more lenient format string 932 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 933 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 934 if (real_name == NULL) { 935 return false; 936 } 937 return set_fp_numeric_flag(real_name, value, origin); 938 } 939 } 940 941 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 942 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 943 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 944 if (real_name == NULL) { 945 return false; 946 } 947 return set_numeric_flag(real_name, value, origin); 948 } 949 950 return false; 951 } 952 953 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 954 assert(bldarray != NULL, "illegal argument"); 955 956 if (arg == NULL) { 957 return; 958 } 959 960 int new_count = *count + 1; 961 962 // expand the array and add arg to the last element 963 if (*bldarray == NULL) { 964 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 965 } else { 966 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 967 } 968 (*bldarray)[*count] = os::strdup_check_oom(arg); 969 *count = new_count; 970 } 971 972 void Arguments::build_jvm_args(const char* arg) { 973 add_string(&_jvm_args_array, &_num_jvm_args, arg); 974 } 975 976 void Arguments::build_jvm_flags(const char* arg) { 977 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 978 } 979 980 // utility function to return a string that concatenates all 981 // strings in a given char** array 982 const char* Arguments::build_resource_string(char** args, int count) { 983 if (args == NULL || count == 0) { 984 return NULL; 985 } 986 size_t length = 0; 987 for (int i = 0; i < count; i++) { 988 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 989 } 990 char* s = NEW_RESOURCE_ARRAY(char, length); 991 char* dst = s; 992 for (int j = 0; j < count; j++) { 993 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 994 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 995 dst += offset; 996 length -= offset; 997 } 998 return (const char*) s; 999 } 1000 1001 void Arguments::print_on(outputStream* st) { 1002 st->print_cr("VM Arguments:"); 1003 if (num_jvm_flags() > 0) { 1004 st->print("jvm_flags: "); print_jvm_flags_on(st); 1005 st->cr(); 1006 } 1007 if (num_jvm_args() > 0) { 1008 st->print("jvm_args: "); print_jvm_args_on(st); 1009 st->cr(); 1010 } 1011 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1012 if (_java_class_path != NULL) { 1013 char* path = _java_class_path->value(); 1014 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1015 } 1016 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1017 } 1018 1019 void Arguments::print_summary_on(outputStream* st) { 1020 // Print the command line. Environment variables that are helpful for 1021 // reproducing the problem are written later in the hs_err file. 1022 // flags are from setting file 1023 if (num_jvm_flags() > 0) { 1024 st->print_raw("Settings File: "); 1025 print_jvm_flags_on(st); 1026 st->cr(); 1027 } 1028 // args are the command line and environment variable arguments. 1029 st->print_raw("Command Line: "); 1030 if (num_jvm_args() > 0) { 1031 print_jvm_args_on(st); 1032 } 1033 // this is the classfile and any arguments to the java program 1034 if (java_command() != NULL) { 1035 st->print("%s", java_command()); 1036 } 1037 st->cr(); 1038 } 1039 1040 void Arguments::print_jvm_flags_on(outputStream* st) { 1041 if (_num_jvm_flags > 0) { 1042 for (int i=0; i < _num_jvm_flags; i++) { 1043 st->print("%s ", _jvm_flags_array[i]); 1044 } 1045 } 1046 } 1047 1048 void Arguments::print_jvm_args_on(outputStream* st) { 1049 if (_num_jvm_args > 0) { 1050 for (int i=0; i < _num_jvm_args; i++) { 1051 st->print("%s ", _jvm_args_array[i]); 1052 } 1053 } 1054 } 1055 1056 bool Arguments::process_argument(const char* arg, 1057 jboolean ignore_unrecognized, 1058 Flag::Flags origin) { 1059 JDK_Version since = JDK_Version(); 1060 1061 if (parse_argument(arg, origin)) { 1062 return true; 1063 } 1064 1065 // Determine if the flag has '+', '-', or '=' characters. 1066 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1067 const char* const argname = has_plus_minus ? arg + 1 : arg; 1068 1069 size_t arg_len; 1070 const char* equal_sign = strchr(argname, '='); 1071 if (equal_sign == NULL) { 1072 arg_len = strlen(argname); 1073 } else { 1074 arg_len = equal_sign - argname; 1075 } 1076 1077 // Only make the obsolete check for valid arguments. 1078 if (arg_len <= BUFLEN) { 1079 // Construct a string which consists only of the argument name without '+', '-', or '='. 1080 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1081 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1082 if (is_obsolete_flag(stripped_argname, &since)) { 1083 char version[256]; 1084 since.to_string(version, sizeof(version)); 1085 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1086 return true; 1087 } 1088 #ifndef PRODUCT 1089 else { 1090 const char* replacement; 1091 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1092 log_warning(arguments)("%s has been removed. Please use %s instead.", 1093 stripped_argname, 1094 replacement); 1095 return false; 1096 } 1097 } 1098 #endif //PRODUCT 1099 } 1100 1101 // For locked flags, report a custom error message if available. 1102 // Otherwise, report the standard unrecognized VM option. 1103 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1104 if (found_flag != NULL) { 1105 char locked_message_buf[BUFLEN]; 1106 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1107 if (strlen(locked_message_buf) == 0) { 1108 if (found_flag->is_bool() && !has_plus_minus) { 1109 jio_fprintf(defaultStream::error_stream(), 1110 "Missing +/- setting for VM option '%s'\n", argname); 1111 } else if (!found_flag->is_bool() && has_plus_minus) { 1112 jio_fprintf(defaultStream::error_stream(), 1113 "Unexpected +/- setting in VM option '%s'\n", argname); 1114 } else { 1115 jio_fprintf(defaultStream::error_stream(), 1116 "Improperly specified VM option '%s'\n", argname); 1117 } 1118 } else { 1119 #ifdef PRODUCT 1120 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1121 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1122 if (ignore_unrecognized && mismatched) { 1123 return true; 1124 } 1125 #endif 1126 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1127 } 1128 } else { 1129 if (ignore_unrecognized) { 1130 return true; 1131 } 1132 jio_fprintf(defaultStream::error_stream(), 1133 "Unrecognized VM option '%s'\n", argname); 1134 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1135 if (fuzzy_matched != NULL) { 1136 jio_fprintf(defaultStream::error_stream(), 1137 "Did you mean '%s%s%s'? ", 1138 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1139 fuzzy_matched->_name, 1140 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1141 } 1142 } 1143 1144 // allow for commandline "commenting out" options like -XX:#+Verbose 1145 return arg[0] == '#'; 1146 } 1147 1148 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1149 FILE* stream = fopen(file_name, "rb"); 1150 if (stream == NULL) { 1151 if (should_exist) { 1152 jio_fprintf(defaultStream::error_stream(), 1153 "Could not open settings file %s\n", file_name); 1154 return false; 1155 } else { 1156 return true; 1157 } 1158 } 1159 1160 char token[1024]; 1161 int pos = 0; 1162 1163 bool in_white_space = true; 1164 bool in_comment = false; 1165 bool in_quote = false; 1166 char quote_c = 0; 1167 bool result = true; 1168 1169 int c = getc(stream); 1170 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1171 if (in_white_space) { 1172 if (in_comment) { 1173 if (c == '\n') in_comment = false; 1174 } else { 1175 if (c == '#') in_comment = true; 1176 else if (!isspace(c)) { 1177 in_white_space = false; 1178 token[pos++] = c; 1179 } 1180 } 1181 } else { 1182 if (c == '\n' || (!in_quote && isspace(c))) { 1183 // token ends at newline, or at unquoted whitespace 1184 // this allows a way to include spaces in string-valued options 1185 token[pos] = '\0'; 1186 logOption(token); 1187 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1188 build_jvm_flags(token); 1189 pos = 0; 1190 in_white_space = true; 1191 in_quote = false; 1192 } else if (!in_quote && (c == '\'' || c == '"')) { 1193 in_quote = true; 1194 quote_c = c; 1195 } else if (in_quote && (c == quote_c)) { 1196 in_quote = false; 1197 } else { 1198 token[pos++] = c; 1199 } 1200 } 1201 c = getc(stream); 1202 } 1203 if (pos > 0) { 1204 token[pos] = '\0'; 1205 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1206 build_jvm_flags(token); 1207 } 1208 fclose(stream); 1209 return result; 1210 } 1211 1212 //============================================================================================================= 1213 // Parsing of properties (-D) 1214 1215 const char* Arguments::get_property(const char* key) { 1216 return PropertyList_get_value(system_properties(), key); 1217 } 1218 1219 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1220 const char* eq = strchr(prop, '='); 1221 const char* key; 1222 const char* value = ""; 1223 1224 if (eq == NULL) { 1225 // property doesn't have a value, thus use passed string 1226 key = prop; 1227 } else { 1228 // property have a value, thus extract it and save to the 1229 // allocated string 1230 size_t key_len = eq - prop; 1231 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1232 1233 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1234 key = tmp_key; 1235 1236 value = &prop[key_len + 1]; 1237 } 1238 1239 if (strcmp(key, "java.compiler") == 0) { 1240 process_java_compiler_argument(value); 1241 // Record value in Arguments, but let it get passed to Java. 1242 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1243 strcmp(key, "sun.java.launcher.pid") == 0) { 1244 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1245 // private and are processed in process_sun_java_launcher_properties(); 1246 // the sun.java.launcher property is passed on to the java application 1247 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1248 // append is true, writable is true, internal is false 1249 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1250 WriteableProperty, ExternalProperty); 1251 } else { 1252 if (strcmp(key, "sun.java.command") == 0) { 1253 char *old_java_command = _java_command; 1254 _java_command = os::strdup_check_oom(value, mtArguments); 1255 if (old_java_command != NULL) { 1256 os::free(old_java_command); 1257 } 1258 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1259 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1260 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1261 // its value without going through the property list or making a Java call. 1262 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1263 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1264 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1265 os::free((void *)old_java_vendor_url_bug); 1266 } 1267 } 1268 1269 // Create new property and add at the end of the list 1270 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1271 } 1272 1273 if (key != prop) { 1274 // SystemProperty copy passed value, thus free previously allocated 1275 // memory 1276 FreeHeap((void *)key); 1277 } 1278 1279 return true; 1280 } 1281 1282 #if INCLUDE_CDS 1283 void Arguments::check_unsupported_dumping_properties() { 1284 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1285 const char* unsupported_properties[] = { "jdk.module.main", 1286 "jdk.module.limitmods", 1287 "jdk.module.path", 1288 "jdk.module.upgrade.path", 1289 "jdk.module.addmods.0", 1290 "jdk.module.patch.0" }; 1291 const char* unsupported_options[] = { "-m", // cannot use at dump time 1292 "--limit-modules", // ignored at dump time 1293 "--module-path", // ignored at dump time 1294 "--upgrade-module-path", // ignored at dump time 1295 "--add-modules", // ignored at dump time 1296 "--patch-module" // ignored at dump time 1297 }; 1298 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1299 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1300 // vm will exit with an error message. Otherwise, it will print an informational message if 1301 // PrintSharedSpaces is enabled. 1302 uint info_idx = 1; 1303 SystemProperty* sp = system_properties(); 1304 while (sp != NULL) { 1305 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1306 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1307 if (i < info_idx) { 1308 vm_exit_during_initialization( 1309 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1310 } else { 1311 if (PrintSharedSpaces) { 1312 tty->print_cr( 1313 "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]); 1314 } 1315 } 1316 } 1317 } 1318 sp = sp->next(); 1319 } 1320 1321 // Check for an exploded module build in use with -Xshare:dump. 1322 if (!has_jimage()) { 1323 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1324 } 1325 } 1326 #endif 1327 1328 //=========================================================================================================== 1329 // Setting int/mixed/comp mode flags 1330 1331 void Arguments::set_mode_flags(Mode mode) { 1332 // Set up default values for all flags. 1333 // If you add a flag to any of the branches below, 1334 // add a default value for it here. 1335 set_java_compiler(false); 1336 _mode = mode; 1337 1338 // Ensure Agent_OnLoad has the correct initial values. 1339 // This may not be the final mode; mode may change later in onload phase. 1340 PropertyList_unique_add(&_system_properties, "java.vm.info", 1341 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1342 1343 UseInterpreter = true; 1344 UseCompiler = true; 1345 UseLoopCounter = true; 1346 1347 // Default values may be platform/compiler dependent - 1348 // use the saved values 1349 ClipInlining = Arguments::_ClipInlining; 1350 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1351 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1352 BackgroundCompilation = Arguments::_BackgroundCompilation; 1353 if (TieredCompilation) { 1354 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1355 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1356 } 1357 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1358 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1359 } 1360 } 1361 1362 // Change from defaults based on mode 1363 switch (mode) { 1364 default: 1365 ShouldNotReachHere(); 1366 break; 1367 case _int: 1368 UseCompiler = false; 1369 UseLoopCounter = false; 1370 AlwaysCompileLoopMethods = false; 1371 UseOnStackReplacement = false; 1372 break; 1373 case _mixed: 1374 // same as default 1375 break; 1376 case _comp: 1377 UseInterpreter = false; 1378 BackgroundCompilation = false; 1379 ClipInlining = false; 1380 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1381 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1382 // compile a level 4 (C2) and then continue executing it. 1383 if (TieredCompilation) { 1384 Tier3InvokeNotifyFreqLog = 0; 1385 Tier4InvocationThreshold = 0; 1386 } 1387 break; 1388 } 1389 } 1390 1391 // Conflict: required to use shared spaces (-Xshare:on), but 1392 // incompatible command line options were chosen. 1393 static void no_shared_spaces(const char* message) { 1394 if (RequireSharedSpaces) { 1395 jio_fprintf(defaultStream::error_stream(), 1396 "Class data sharing is inconsistent with other specified options.\n"); 1397 vm_exit_during_initialization("Unable to use shared archive.", message); 1398 } else { 1399 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1400 } 1401 } 1402 1403 // Returns threshold scaled with the value of scale. 1404 // If scale < 0.0, threshold is returned without scaling. 1405 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1406 if (scale == 1.0 || scale < 0.0) { 1407 return threshold; 1408 } else { 1409 return (intx)(threshold * scale); 1410 } 1411 } 1412 1413 // Returns freq_log scaled with the value of scale. 1414 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1415 // If scale < 0.0, freq_log is returned without scaling. 1416 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1417 // Check if scaling is necessary or if negative value was specified. 1418 if (scale == 1.0 || scale < 0.0) { 1419 return freq_log; 1420 } 1421 // Check values to avoid calculating log2 of 0. 1422 if (scale == 0.0 || freq_log == 0) { 1423 return 0; 1424 } 1425 // Determine the maximum notification frequency value currently supported. 1426 // The largest mask value that the interpreter/C1 can handle is 1427 // of length InvocationCounter::number_of_count_bits. Mask values are always 1428 // one bit shorter then the value of the notification frequency. Set 1429 // max_freq_bits accordingly. 1430 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1431 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1432 if (scaled_freq == 0) { 1433 // Return 0 right away to avoid calculating log2 of 0. 1434 return 0; 1435 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1436 return max_freq_bits; 1437 } else { 1438 return log2_intptr(scaled_freq); 1439 } 1440 } 1441 1442 void Arguments::set_tiered_flags() { 1443 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1444 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1445 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1446 } 1447 if (CompilationPolicyChoice < 2) { 1448 vm_exit_during_initialization( 1449 "Incompatible compilation policy selected", NULL); 1450 } 1451 // Increase the code cache size - tiered compiles a lot more. 1452 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1453 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1454 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1455 } 1456 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1457 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1458 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1459 } 1460 if (!UseInterpreter) { // -Xcomp 1461 Tier3InvokeNotifyFreqLog = 0; 1462 Tier4InvocationThreshold = 0; 1463 } 1464 1465 if (CompileThresholdScaling < 0) { 1466 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1467 } 1468 1469 // Scale tiered compilation thresholds. 1470 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1471 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1472 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1473 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1474 1475 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1476 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1477 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1478 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1479 1480 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1481 // once these thresholds become supported. 1482 1483 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1484 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1485 1486 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1487 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1488 1489 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1490 1491 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1492 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1493 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1494 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1495 } 1496 } 1497 1498 #if INCLUDE_ALL_GCS 1499 static void disable_adaptive_size_policy(const char* collector_name) { 1500 if (UseAdaptiveSizePolicy) { 1501 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1502 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1503 collector_name); 1504 } 1505 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1506 } 1507 } 1508 1509 void Arguments::set_parnew_gc_flags() { 1510 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1511 "control point invariant"); 1512 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1513 1514 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1515 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1516 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1517 } else if (ParallelGCThreads == 0) { 1518 jio_fprintf(defaultStream::error_stream(), 1519 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1520 vm_exit(1); 1521 } 1522 1523 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1524 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1525 // we set them to 1024 and 1024. 1526 // See CR 6362902. 1527 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1528 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1529 } 1530 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1531 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1532 } 1533 1534 // When using compressed oops, we use local overflow stacks, 1535 // rather than using a global overflow list chained through 1536 // the klass word of the object's pre-image. 1537 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1538 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1539 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1540 } 1541 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1542 } 1543 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1544 } 1545 1546 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1547 // sparc/solaris for certain applications, but would gain from 1548 // further optimization and tuning efforts, and would almost 1549 // certainly gain from analysis of platform and environment. 1550 void Arguments::set_cms_and_parnew_gc_flags() { 1551 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1552 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1553 1554 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1555 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1556 1557 set_parnew_gc_flags(); 1558 1559 size_t max_heap = align_size_down(MaxHeapSize, 1560 CardTableRS::ct_max_alignment_constraint()); 1561 1562 // Now make adjustments for CMS 1563 intx tenuring_default = (intx)6; 1564 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1565 1566 // Preferred young gen size for "short" pauses: 1567 // upper bound depends on # of threads and NewRatio. 1568 const size_t preferred_max_new_size_unaligned = 1569 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1570 size_t preferred_max_new_size = 1571 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1572 1573 // Unless explicitly requested otherwise, size young gen 1574 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1575 1576 // If either MaxNewSize or NewRatio is set on the command line, 1577 // assume the user is trying to set the size of the young gen. 1578 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1579 1580 // Set MaxNewSize to our calculated preferred_max_new_size unless 1581 // NewSize was set on the command line and it is larger than 1582 // preferred_max_new_size. 1583 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1584 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1585 } else { 1586 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1587 } 1588 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1589 1590 // Code along this path potentially sets NewSize and OldSize 1591 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1592 min_heap_size(), InitialHeapSize, max_heap); 1593 size_t min_new = preferred_max_new_size; 1594 if (FLAG_IS_CMDLINE(NewSize)) { 1595 min_new = NewSize; 1596 } 1597 if (max_heap > min_new && min_heap_size() > min_new) { 1598 // Unless explicitly requested otherwise, make young gen 1599 // at least min_new, and at most preferred_max_new_size. 1600 if (FLAG_IS_DEFAULT(NewSize)) { 1601 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1602 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1603 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1604 } 1605 // Unless explicitly requested otherwise, size old gen 1606 // so it's NewRatio x of NewSize. 1607 if (FLAG_IS_DEFAULT(OldSize)) { 1608 if (max_heap > NewSize) { 1609 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1610 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1611 } 1612 } 1613 } 1614 } 1615 // Unless explicitly requested otherwise, definitely 1616 // promote all objects surviving "tenuring_default" scavenges. 1617 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1618 FLAG_IS_DEFAULT(SurvivorRatio)) { 1619 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1620 } 1621 // If we decided above (or user explicitly requested) 1622 // `promote all' (via MaxTenuringThreshold := 0), 1623 // prefer minuscule survivor spaces so as not to waste 1624 // space for (non-existent) survivors 1625 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1626 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1627 } 1628 1629 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1630 // but rather the number of free blocks of a given size that are used when 1631 // replenishing the local per-worker free list caches. 1632 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1633 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1634 // OldPLAB sizing manually turned off: Use a larger default setting, 1635 // unless it was manually specified. This is because a too-low value 1636 // will slow down scavenges. 1637 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1638 } else { 1639 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1640 } 1641 } 1642 1643 // If either of the static initialization defaults have changed, note this 1644 // modification. 1645 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1646 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1647 } 1648 1649 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1650 } 1651 #endif // INCLUDE_ALL_GCS 1652 1653 void set_object_alignment() { 1654 // Object alignment. 1655 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1656 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1657 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1658 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1659 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1660 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1661 1662 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1663 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1664 1665 // Oop encoding heap max 1666 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1667 1668 if (SurvivorAlignmentInBytes == 0) { 1669 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1670 } 1671 1672 #if INCLUDE_ALL_GCS 1673 // Set CMS global values 1674 CompactibleFreeListSpace::set_cms_values(); 1675 #endif // INCLUDE_ALL_GCS 1676 } 1677 1678 size_t Arguments::max_heap_for_compressed_oops() { 1679 // Avoid sign flip. 1680 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1681 // We need to fit both the NULL page and the heap into the memory budget, while 1682 // keeping alignment constraints of the heap. To guarantee the latter, as the 1683 // NULL page is located before the heap, we pad the NULL page to the conservative 1684 // maximum alignment that the GC may ever impose upon the heap. 1685 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1686 _conservative_max_heap_alignment); 1687 1688 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1689 NOT_LP64(ShouldNotReachHere(); return 0); 1690 } 1691 1692 void Arguments::set_use_compressed_oops() { 1693 #ifndef ZERO 1694 #ifdef _LP64 1695 // MaxHeapSize is not set up properly at this point, but 1696 // the only value that can override MaxHeapSize if we are 1697 // to use UseCompressedOops is InitialHeapSize. 1698 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1699 1700 if (max_heap_size <= max_heap_for_compressed_oops()) { 1701 #if !defined(COMPILER1) || defined(TIERED) 1702 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1703 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1704 } 1705 #endif 1706 } else { 1707 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1708 warning("Max heap size too large for Compressed Oops"); 1709 FLAG_SET_DEFAULT(UseCompressedOops, false); 1710 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1711 } 1712 } 1713 #endif // _LP64 1714 #endif // ZERO 1715 } 1716 1717 1718 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1719 // set_use_compressed_oops(). 1720 void Arguments::set_use_compressed_klass_ptrs() { 1721 #ifndef ZERO 1722 #ifdef _LP64 1723 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1724 if (!UseCompressedOops) { 1725 if (UseCompressedClassPointers) { 1726 warning("UseCompressedClassPointers requires UseCompressedOops"); 1727 } 1728 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1729 } else { 1730 // Turn on UseCompressedClassPointers too 1731 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1732 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1733 } 1734 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1735 if (UseCompressedClassPointers) { 1736 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1737 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1738 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1739 } 1740 } 1741 } 1742 #endif // _LP64 1743 #endif // !ZERO 1744 } 1745 1746 void Arguments::set_conservative_max_heap_alignment() { 1747 // The conservative maximum required alignment for the heap is the maximum of 1748 // the alignments imposed by several sources: any requirements from the heap 1749 // itself, the collector policy and the maximum page size we may run the VM 1750 // with. 1751 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1752 #if INCLUDE_ALL_GCS 1753 if (UseParallelGC) { 1754 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1755 } else if (UseG1GC) { 1756 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1757 } 1758 #endif // INCLUDE_ALL_GCS 1759 _conservative_max_heap_alignment = MAX4(heap_alignment, 1760 (size_t)os::vm_allocation_granularity(), 1761 os::max_page_size(), 1762 CollectorPolicy::compute_heap_alignment()); 1763 } 1764 1765 bool Arguments::gc_selected() { 1766 #if INCLUDE_ALL_GCS 1767 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1768 #else 1769 return UseSerialGC; 1770 #endif // INCLUDE_ALL_GCS 1771 } 1772 1773 #ifdef TIERED 1774 bool Arguments::compilation_mode_selected() { 1775 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1776 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1777 1778 } 1779 1780 void Arguments::select_compilation_mode_ergonomically() { 1781 #if defined(_WINDOWS) && !defined(_LP64) 1782 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1783 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1784 } 1785 #endif 1786 if (NeverActAsServerClassMachine) { 1787 set_client_compilation_mode(); 1788 } 1789 } 1790 #endif //TIERED 1791 1792 void Arguments::select_gc_ergonomically() { 1793 #if INCLUDE_ALL_GCS 1794 if (os::is_server_class_machine()) { 1795 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1796 } else { 1797 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1798 } 1799 #else 1800 UNSUPPORTED_OPTION(UseG1GC); 1801 UNSUPPORTED_OPTION(UseParallelGC); 1802 UNSUPPORTED_OPTION(UseParallelOldGC); 1803 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1804 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1805 #endif // INCLUDE_ALL_GCS 1806 } 1807 1808 void Arguments::select_gc() { 1809 if (!gc_selected()) { 1810 select_gc_ergonomically(); 1811 if (!gc_selected()) { 1812 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1813 } 1814 } 1815 } 1816 1817 #if INCLUDE_JVMCI 1818 void Arguments::set_jvmci_specific_flags() { 1819 if (UseJVMCICompiler) { 1820 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1821 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1822 } 1823 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1824 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1825 } 1826 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1827 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1828 } 1829 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1830 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1831 } 1832 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1833 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1834 } 1835 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1836 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1837 } 1838 if (TieredStopAtLevel != CompLevel_full_optimization) { 1839 // Currently JVMCI compiler can only work at the full optimization level 1840 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1841 TieredStopAtLevel = CompLevel_full_optimization; 1842 } 1843 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1844 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1845 } 1846 } 1847 } 1848 #endif 1849 1850 void Arguments::set_ergonomics_flags() { 1851 #ifdef TIERED 1852 if (!compilation_mode_selected()) { 1853 select_compilation_mode_ergonomically(); 1854 } 1855 #endif 1856 select_gc(); 1857 1858 #if defined(COMPILER2) || INCLUDE_JVMCI 1859 // Shared spaces work fine with other GCs but causes bytecode rewriting 1860 // to be disabled, which hurts interpreter performance and decreases 1861 // server performance. When -server is specified, keep the default off 1862 // unless it is asked for. Future work: either add bytecode rewriting 1863 // at link time, or rewrite bytecodes in non-shared methods. 1864 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1865 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1866 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1867 } 1868 #endif 1869 1870 set_conservative_max_heap_alignment(); 1871 1872 #ifndef ZERO 1873 #ifdef _LP64 1874 set_use_compressed_oops(); 1875 1876 // set_use_compressed_klass_ptrs() must be called after calling 1877 // set_use_compressed_oops(). 1878 set_use_compressed_klass_ptrs(); 1879 1880 // Also checks that certain machines are slower with compressed oops 1881 // in vm_version initialization code. 1882 #endif // _LP64 1883 #endif // !ZERO 1884 1885 } 1886 1887 void Arguments::set_parallel_gc_flags() { 1888 assert(UseParallelGC || UseParallelOldGC, "Error"); 1889 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1890 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1891 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1892 } 1893 FLAG_SET_DEFAULT(UseParallelGC, true); 1894 1895 // If no heap maximum was requested explicitly, use some reasonable fraction 1896 // of the physical memory, up to a maximum of 1GB. 1897 FLAG_SET_DEFAULT(ParallelGCThreads, 1898 Abstract_VM_Version::parallel_worker_threads()); 1899 if (ParallelGCThreads == 0) { 1900 jio_fprintf(defaultStream::error_stream(), 1901 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1902 vm_exit(1); 1903 } 1904 1905 if (UseAdaptiveSizePolicy) { 1906 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1907 // unless the user actually sets these flags. 1908 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1909 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1910 } 1911 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1912 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1913 } 1914 } 1915 1916 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1917 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1918 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1919 // See CR 6362902 for details. 1920 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1921 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1922 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1923 } 1924 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1925 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1926 } 1927 } 1928 1929 if (UseParallelOldGC) { 1930 // Par compact uses lower default values since they are treated as 1931 // minimums. These are different defaults because of the different 1932 // interpretation and are not ergonomically set. 1933 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1934 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1935 } 1936 } 1937 } 1938 1939 void Arguments::set_g1_gc_flags() { 1940 assert(UseG1GC, "Error"); 1941 #if defined(COMPILER1) || INCLUDE_JVMCI 1942 FastTLABRefill = false; 1943 #endif 1944 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1945 if (ParallelGCThreads == 0) { 1946 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1947 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1948 } 1949 1950 #if INCLUDE_ALL_GCS 1951 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1952 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1953 } 1954 #endif 1955 1956 // MarkStackSize will be set (if it hasn't been set by the user) 1957 // when concurrent marking is initialized. 1958 // Its value will be based upon the number of parallel marking threads. 1959 // But we do set the maximum mark stack size here. 1960 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1961 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1962 } 1963 1964 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1965 // In G1, we want the default GC overhead goal to be higher than 1966 // it is for PS, or the heap might be expanded too aggressively. 1967 // We set it here to ~8%. 1968 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1969 } 1970 1971 // Below, we might need to calculate the pause time interval based on 1972 // the pause target. When we do so we are going to give G1 maximum 1973 // flexibility and allow it to do pauses when it needs to. So, we'll 1974 // arrange that the pause interval to be pause time target + 1 to 1975 // ensure that a) the pause time target is maximized with respect to 1976 // the pause interval and b) we maintain the invariant that pause 1977 // time target < pause interval. If the user does not want this 1978 // maximum flexibility, they will have to set the pause interval 1979 // explicitly. 1980 1981 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1982 // The default pause time target in G1 is 200ms 1983 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1984 } 1985 1986 // Then, if the interval parameter was not set, set it according to 1987 // the pause time target (this will also deal with the case when the 1988 // pause time target is the default value). 1989 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1990 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1991 } 1992 1993 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1994 } 1995 1996 void Arguments::set_gc_specific_flags() { 1997 #if INCLUDE_ALL_GCS 1998 // Set per-collector flags 1999 if (UseParallelGC || UseParallelOldGC) { 2000 set_parallel_gc_flags(); 2001 } else if (UseConcMarkSweepGC) { 2002 set_cms_and_parnew_gc_flags(); 2003 } else if (UseG1GC) { 2004 set_g1_gc_flags(); 2005 } 2006 if (AssumeMP && !UseSerialGC) { 2007 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2008 warning("If the number of processors is expected to increase from one, then" 2009 " you should configure the number of parallel GC threads appropriately" 2010 " using -XX:ParallelGCThreads=N"); 2011 } 2012 } 2013 if (MinHeapFreeRatio == 100) { 2014 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2015 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2016 } 2017 2018 // If class unloading is disabled, also disable concurrent class unloading. 2019 if (!ClassUnloading) { 2020 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2021 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2022 } 2023 #endif // INCLUDE_ALL_GCS 2024 } 2025 2026 julong Arguments::limit_by_allocatable_memory(julong limit) { 2027 julong max_allocatable; 2028 julong result = limit; 2029 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2030 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2031 } 2032 return result; 2033 } 2034 2035 // Use static initialization to get the default before parsing 2036 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2037 2038 void Arguments::set_heap_size() { 2039 julong phys_mem = 2040 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2041 : (julong)MaxRAM; 2042 2043 // Experimental support for CGroup memory limits 2044 if (UseCGroupMemoryLimitForHeap) { 2045 // This is a rough indicator that a CGroup limit may be in force 2046 // for this process 2047 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 2048 FILE *fp = fopen(lim_file, "r"); 2049 if (fp != NULL) { 2050 julong cgroup_max = 0; 2051 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2052 if (ret == 1 && cgroup_max > 0) { 2053 // If unlimited, cgroup_max will be a very large, but unspecified 2054 // value, so use initial phys_mem as a limit 2055 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2056 JULONG_FORMAT "MB) and initial phys_mem (" 2057 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2058 phys_mem = MIN2(cgroup_max, phys_mem); 2059 } else { 2060 warning("Unable to read/parse cgroup memory limit from %s: %s", 2061 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2062 } 2063 fclose(fp); 2064 } else { 2065 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2066 } 2067 } 2068 2069 // If the maximum heap size has not been set with -Xmx, 2070 // then set it as fraction of the size of physical memory, 2071 // respecting the maximum and minimum sizes of the heap. 2072 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2073 julong reasonable_max = phys_mem / MaxRAMFraction; 2074 2075 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2076 // Small physical memory, so use a minimum fraction of it for the heap 2077 reasonable_max = phys_mem / MinRAMFraction; 2078 } else { 2079 // Not-small physical memory, so require a heap at least 2080 // as large as MaxHeapSize 2081 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2082 } 2083 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2084 // Limit the heap size to ErgoHeapSizeLimit 2085 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2086 } 2087 if (UseCompressedOops) { 2088 // Limit the heap size to the maximum possible when using compressed oops 2089 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2090 2091 // HeapBaseMinAddress can be greater than default but not less than. 2092 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2093 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2094 // matches compressed oops printing flags 2095 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2096 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2097 DefaultHeapBaseMinAddress, 2098 DefaultHeapBaseMinAddress/G, 2099 HeapBaseMinAddress); 2100 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2101 } 2102 } 2103 2104 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2105 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2106 // but it should be not less than default MaxHeapSize. 2107 max_coop_heap -= HeapBaseMinAddress; 2108 } 2109 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2110 } 2111 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2112 2113 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2114 // An initial heap size was specified on the command line, 2115 // so be sure that the maximum size is consistent. Done 2116 // after call to limit_by_allocatable_memory because that 2117 // method might reduce the allocation size. 2118 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2119 } 2120 2121 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2122 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2123 } 2124 2125 // If the minimum or initial heap_size have not been set or requested to be set 2126 // ergonomically, set them accordingly. 2127 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2128 julong reasonable_minimum = (julong)(OldSize + NewSize); 2129 2130 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2131 2132 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2133 2134 if (InitialHeapSize == 0) { 2135 julong reasonable_initial = phys_mem / InitialRAMFraction; 2136 2137 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2138 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2139 2140 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2141 2142 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2143 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2144 } 2145 // If the minimum heap size has not been set (via -Xms), 2146 // synchronize with InitialHeapSize to avoid errors with the default value. 2147 if (min_heap_size() == 0) { 2148 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2149 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2150 } 2151 } 2152 } 2153 2154 // This option inspects the machine and attempts to set various 2155 // parameters to be optimal for long-running, memory allocation 2156 // intensive jobs. It is intended for machines with large 2157 // amounts of cpu and memory. 2158 jint Arguments::set_aggressive_heap_flags() { 2159 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2160 // VM, but we may not be able to represent the total physical memory 2161 // available (like having 8gb of memory on a box but using a 32bit VM). 2162 // Thus, we need to make sure we're using a julong for intermediate 2163 // calculations. 2164 julong initHeapSize; 2165 julong total_memory = os::physical_memory(); 2166 2167 if (total_memory < (julong) 256 * M) { 2168 jio_fprintf(defaultStream::error_stream(), 2169 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2170 vm_exit(1); 2171 } 2172 2173 // The heap size is half of available memory, or (at most) 2174 // all of possible memory less 160mb (leaving room for the OS 2175 // when using ISM). This is the maximum; because adaptive sizing 2176 // is turned on below, the actual space used may be smaller. 2177 2178 initHeapSize = MIN2(total_memory / (julong) 2, 2179 total_memory - (julong) 160 * M); 2180 2181 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2182 2183 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2184 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2185 return JNI_EINVAL; 2186 } 2187 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2188 return JNI_EINVAL; 2189 } 2190 // Currently the minimum size and the initial heap sizes are the same. 2191 set_min_heap_size(initHeapSize); 2192 } 2193 if (FLAG_IS_DEFAULT(NewSize)) { 2194 // Make the young generation 3/8ths of the total heap. 2195 if (FLAG_SET_CMDLINE(size_t, NewSize, 2196 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2197 return JNI_EINVAL; 2198 } 2199 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2200 return JNI_EINVAL; 2201 } 2202 } 2203 2204 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2205 FLAG_SET_DEFAULT(UseLargePages, true); 2206 #endif 2207 2208 // Increase some data structure sizes for efficiency 2209 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2210 return JNI_EINVAL; 2211 } 2212 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2213 return JNI_EINVAL; 2214 } 2215 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2216 return JNI_EINVAL; 2217 } 2218 2219 // See the OldPLABSize comment below, but replace 'after promotion' 2220 // with 'after copying'. YoungPLABSize is the size of the survivor 2221 // space per-gc-thread buffers. The default is 4kw. 2222 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2223 return JNI_EINVAL; 2224 } 2225 2226 // OldPLABSize is the size of the buffers in the old gen that 2227 // UseParallelGC uses to promote live data that doesn't fit in the 2228 // survivor spaces. At any given time, there's one for each gc thread. 2229 // The default size is 1kw. These buffers are rarely used, since the 2230 // survivor spaces are usually big enough. For specjbb, however, there 2231 // are occasions when there's lots of live data in the young gen 2232 // and we end up promoting some of it. We don't have a definite 2233 // explanation for why bumping OldPLABSize helps, but the theory 2234 // is that a bigger PLAB results in retaining something like the 2235 // original allocation order after promotion, which improves mutator 2236 // locality. A minor effect may be that larger PLABs reduce the 2237 // number of PLAB allocation events during gc. The value of 8kw 2238 // was arrived at by experimenting with specjbb. 2239 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2240 return JNI_EINVAL; 2241 } 2242 2243 // Enable parallel GC and adaptive generation sizing 2244 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2245 return JNI_EINVAL; 2246 } 2247 2248 // Encourage steady state memory management 2249 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2250 return JNI_EINVAL; 2251 } 2252 2253 // This appears to improve mutator locality 2254 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2255 return JNI_EINVAL; 2256 } 2257 2258 // Get around early Solaris scheduling bug 2259 // (affinity vs other jobs on system) 2260 // but disallow DR and offlining (5008695). 2261 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2262 return JNI_EINVAL; 2263 } 2264 2265 return JNI_OK; 2266 } 2267 2268 // This must be called after ergonomics. 2269 void Arguments::set_bytecode_flags() { 2270 if (!RewriteBytecodes) { 2271 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2272 } 2273 } 2274 2275 // Aggressive optimization flags -XX:+AggressiveOpts 2276 jint Arguments::set_aggressive_opts_flags() { 2277 #ifdef COMPILER2 2278 if (AggressiveUnboxing) { 2279 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2280 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2281 } else if (!EliminateAutoBox) { 2282 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2283 AggressiveUnboxing = false; 2284 } 2285 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2286 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2287 } else if (!DoEscapeAnalysis) { 2288 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2289 AggressiveUnboxing = false; 2290 } 2291 } 2292 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2293 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2294 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2295 } 2296 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2297 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2298 } 2299 2300 // Feed the cache size setting into the JDK 2301 char buffer[1024]; 2302 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2303 if (!add_property(buffer)) { 2304 return JNI_ENOMEM; 2305 } 2306 } 2307 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2308 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2309 } 2310 #endif 2311 2312 if (AggressiveOpts) { 2313 // Sample flag setting code 2314 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2315 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2316 // } 2317 } 2318 2319 return JNI_OK; 2320 } 2321 2322 //=========================================================================================================== 2323 // Parsing of java.compiler property 2324 2325 void Arguments::process_java_compiler_argument(const char* arg) { 2326 // For backwards compatibility, Djava.compiler=NONE or "" 2327 // causes us to switch to -Xint mode UNLESS -Xdebug 2328 // is also specified. 2329 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2330 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2331 } 2332 } 2333 2334 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2335 _sun_java_launcher = os::strdup_check_oom(launcher); 2336 } 2337 2338 bool Arguments::created_by_java_launcher() { 2339 assert(_sun_java_launcher != NULL, "property must have value"); 2340 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2341 } 2342 2343 bool Arguments::sun_java_launcher_is_altjvm() { 2344 return _sun_java_launcher_is_altjvm; 2345 } 2346 2347 //=========================================================================================================== 2348 // Parsing of main arguments 2349 2350 #if INCLUDE_JVMCI 2351 // Check consistency of jvmci vm argument settings. 2352 bool Arguments::check_jvmci_args_consistency() { 2353 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2354 } 2355 #endif //INCLUDE_JVMCI 2356 2357 // Check consistency of GC selection 2358 bool Arguments::check_gc_consistency() { 2359 // Ensure that the user has not selected conflicting sets 2360 // of collectors. 2361 uint i = 0; 2362 if (UseSerialGC) i++; 2363 if (UseConcMarkSweepGC) i++; 2364 if (UseParallelGC || UseParallelOldGC) i++; 2365 if (UseG1GC) i++; 2366 if (i > 1) { 2367 jio_fprintf(defaultStream::error_stream(), 2368 "Conflicting collector combinations in option list; " 2369 "please refer to the release notes for the combinations " 2370 "allowed\n"); 2371 return false; 2372 } 2373 2374 return true; 2375 } 2376 2377 // Check the consistency of vm_init_args 2378 bool Arguments::check_vm_args_consistency() { 2379 // Method for adding checks for flag consistency. 2380 // The intent is to warn the user of all possible conflicts, 2381 // before returning an error. 2382 // Note: Needs platform-dependent factoring. 2383 bool status = true; 2384 2385 if (TLABRefillWasteFraction == 0) { 2386 jio_fprintf(defaultStream::error_stream(), 2387 "TLABRefillWasteFraction should be a denominator, " 2388 "not " SIZE_FORMAT "\n", 2389 TLABRefillWasteFraction); 2390 status = false; 2391 } 2392 2393 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2394 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2395 } 2396 2397 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2398 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2399 } 2400 2401 if (GCTimeLimit == 100) { 2402 // Turn off gc-overhead-limit-exceeded checks 2403 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2404 } 2405 2406 status = status && check_gc_consistency(); 2407 2408 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2409 // insists that we hold the requisite locks so that the iteration is 2410 // MT-safe. For the verification at start-up and shut-down, we don't 2411 // yet have a good way of acquiring and releasing these locks, 2412 // which are not visible at the CollectedHeap level. We want to 2413 // be able to acquire these locks and then do the iteration rather 2414 // than just disable the lock verification. This will be fixed under 2415 // bug 4788986. 2416 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2417 if (VerifyDuringStartup) { 2418 warning("Heap verification at start-up disabled " 2419 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2420 VerifyDuringStartup = false; // Disable verification at start-up 2421 } 2422 2423 if (VerifyBeforeExit) { 2424 warning("Heap verification at shutdown disabled " 2425 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2426 VerifyBeforeExit = false; // Disable verification at shutdown 2427 } 2428 } 2429 2430 if (PrintNMTStatistics) { 2431 #if INCLUDE_NMT 2432 if (MemTracker::tracking_level() == NMT_off) { 2433 #endif // INCLUDE_NMT 2434 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2435 PrintNMTStatistics = false; 2436 #if INCLUDE_NMT 2437 } 2438 #endif 2439 } 2440 2441 #if INCLUDE_JVMCI 2442 status = status && check_jvmci_args_consistency(); 2443 2444 if (EnableJVMCI) { 2445 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2446 AddProperty, UnwriteableProperty, InternalProperty); 2447 2448 if (!ScavengeRootsInCode) { 2449 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2450 ScavengeRootsInCode = 1; 2451 } 2452 } 2453 #endif 2454 2455 // Check lower bounds of the code cache 2456 // Template Interpreter code is approximately 3X larger in debug builds. 2457 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2458 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2459 jio_fprintf(defaultStream::error_stream(), 2460 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2461 os::vm_page_size()/K); 2462 status = false; 2463 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2464 jio_fprintf(defaultStream::error_stream(), 2465 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2466 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2467 status = false; 2468 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2469 jio_fprintf(defaultStream::error_stream(), 2470 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2471 min_code_cache_size/K); 2472 status = false; 2473 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2474 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2475 jio_fprintf(defaultStream::error_stream(), 2476 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2477 CODE_CACHE_SIZE_LIMIT/M); 2478 status = false; 2479 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2480 jio_fprintf(defaultStream::error_stream(), 2481 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2482 min_code_cache_size/K); 2483 status = false; 2484 } 2485 2486 #ifdef _LP64 2487 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2488 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2489 } 2490 #endif 2491 2492 #ifndef SUPPORT_RESERVED_STACK_AREA 2493 if (StackReservedPages != 0) { 2494 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2495 warning("Reserved Stack Area not supported on this platform"); 2496 } 2497 #endif 2498 2499 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2500 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2501 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2502 } 2503 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2504 } 2505 if (UseCompiler && is_interpreter_only()) { 2506 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2507 warning("UseCompiler disabled due to -Xint."); 2508 } 2509 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2510 } 2511 #ifdef COMPILER2 2512 if (PostLoopMultiversioning && !RangeCheckElimination) { 2513 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2514 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2515 } 2516 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2517 } 2518 #endif 2519 2520 if (LP64_ONLY(false &&) !FLAG_IS_DEFAULT(ValueTypePassFieldsAsArgs)) { 2521 FLAG_SET_CMDLINE(bool, ValueTypePassFieldsAsArgs, false); 2522 warning("ValueTypePassFieldsAsArgs is not supported on this platform"); 2523 } 2524 2525 if (LP64_ONLY(false &&) !FLAG_IS_DEFAULT(ValueTypeReturnedAsFields)) { 2526 FLAG_SET_CMDLINE(bool, ValueTypeReturnedAsFields, false); 2527 warning("ValueTypeReturnedAsFields is not supported on this platform"); 2528 } 2529 2530 if (FLAG_IS_DEFAULT(TieredCompilation)) { 2531 // C1 has no support for value types 2532 TieredCompilation = false; 2533 } 2534 2535 if(EnableMVT && EnableValhalla) { 2536 jio_fprintf(defaultStream::error_stream(), 2537 "Conflicting combination in option list: EnableMVT and EnableValhalla cannot be both enabled at the same time"); 2538 } 2539 2540 return status; 2541 } 2542 2543 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2544 const char* option_type) { 2545 if (ignore) return false; 2546 2547 const char* spacer = " "; 2548 if (option_type == NULL) { 2549 option_type = ++spacer; // Set both to the empty string. 2550 } 2551 2552 if (os::obsolete_option(option)) { 2553 jio_fprintf(defaultStream::error_stream(), 2554 "Obsolete %s%soption: %s\n", option_type, spacer, 2555 option->optionString); 2556 return false; 2557 } else { 2558 jio_fprintf(defaultStream::error_stream(), 2559 "Unrecognized %s%soption: %s\n", option_type, spacer, 2560 option->optionString); 2561 return true; 2562 } 2563 } 2564 2565 static const char* user_assertion_options[] = { 2566 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2567 }; 2568 2569 static const char* system_assertion_options[] = { 2570 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2571 }; 2572 2573 bool Arguments::parse_uintx(const char* value, 2574 uintx* uintx_arg, 2575 uintx min_size) { 2576 2577 // Check the sign first since atojulong() parses only unsigned values. 2578 bool value_is_positive = !(*value == '-'); 2579 2580 if (value_is_positive) { 2581 julong n; 2582 bool good_return = atojulong(value, &n); 2583 if (good_return) { 2584 bool above_minimum = n >= min_size; 2585 bool value_is_too_large = n > max_uintx; 2586 2587 if (above_minimum && !value_is_too_large) { 2588 *uintx_arg = n; 2589 return true; 2590 } 2591 } 2592 } 2593 return false; 2594 } 2595 2596 unsigned int addreads_count = 0; 2597 unsigned int addexports_count = 0; 2598 unsigned int addopens_count = 0; 2599 unsigned int addmods_count = 0; 2600 unsigned int patch_mod_count = 0; 2601 2602 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2603 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2604 char* property = AllocateHeap(prop_len, mtArguments); 2605 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2606 if (ret < 0 || ret >= (int)prop_len) { 2607 FreeHeap(property); 2608 return false; 2609 } 2610 bool added = add_property(property, UnwriteableProperty, internal); 2611 FreeHeap(property); 2612 return added; 2613 } 2614 2615 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2616 const unsigned int props_count_limit = 1000; 2617 const int max_digits = 3; 2618 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2619 2620 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2621 if (count < props_count_limit) { 2622 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2623 char* property = AllocateHeap(prop_len, mtArguments); 2624 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2625 if (ret < 0 || ret >= (int)prop_len) { 2626 FreeHeap(property); 2627 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2628 return false; 2629 } 2630 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2631 FreeHeap(property); 2632 return added; 2633 } 2634 2635 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2636 return false; 2637 } 2638 2639 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2640 julong* long_arg, 2641 julong min_size) { 2642 if (!atojulong(s, long_arg)) return arg_unreadable; 2643 return check_memory_size(*long_arg, min_size); 2644 } 2645 2646 // Parse JavaVMInitArgs structure 2647 2648 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2649 const JavaVMInitArgs *java_options_args, 2650 const JavaVMInitArgs *cmd_line_args) { 2651 bool patch_mod_javabase = false; 2652 2653 // Save default settings for some mode flags 2654 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2655 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2656 Arguments::_ClipInlining = ClipInlining; 2657 Arguments::_BackgroundCompilation = BackgroundCompilation; 2658 if (TieredCompilation) { 2659 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2660 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2661 } 2662 2663 // Setup flags for mixed which is the default 2664 set_mode_flags(_mixed); 2665 2666 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2667 // variable (if present). 2668 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2669 if (result != JNI_OK) { 2670 return result; 2671 } 2672 2673 // Parse args structure generated from the command line flags. 2674 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2675 if (result != JNI_OK) { 2676 return result; 2677 } 2678 2679 // Parse args structure generated from the _JAVA_OPTIONS environment 2680 // variable (if present) (mimics classic VM) 2681 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2682 if (result != JNI_OK) { 2683 return result; 2684 } 2685 2686 // Do final processing now that all arguments have been parsed 2687 result = finalize_vm_init_args(); 2688 if (result != JNI_OK) { 2689 return result; 2690 } 2691 2692 #if INCLUDE_CDS 2693 if (UseSharedSpaces && patch_mod_javabase) { 2694 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 2695 } 2696 #endif 2697 2698 return JNI_OK; 2699 } 2700 2701 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2702 // represents a valid JDWP agent. is_path==true denotes that we 2703 // are dealing with -agentpath (case where name is a path), otherwise with 2704 // -agentlib 2705 bool valid_jdwp_agent(char *name, bool is_path) { 2706 char *_name; 2707 const char *_jdwp = "jdwp"; 2708 size_t _len_jdwp, _len_prefix; 2709 2710 if (is_path) { 2711 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2712 return false; 2713 } 2714 2715 _name++; // skip past last path separator 2716 _len_prefix = strlen(JNI_LIB_PREFIX); 2717 2718 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2719 return false; 2720 } 2721 2722 _name += _len_prefix; 2723 _len_jdwp = strlen(_jdwp); 2724 2725 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2726 _name += _len_jdwp; 2727 } 2728 else { 2729 return false; 2730 } 2731 2732 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2733 return false; 2734 } 2735 2736 return true; 2737 } 2738 2739 if (strcmp(name, _jdwp) == 0) { 2740 return true; 2741 } 2742 2743 return false; 2744 } 2745 2746 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2747 // --patch-module=<module>=<file>(<pathsep><file>)* 2748 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2749 // Find the equal sign between the module name and the path specification 2750 const char* module_equal = strchr(patch_mod_tail, '='); 2751 if (module_equal == NULL) { 2752 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2753 return JNI_ERR; 2754 } else { 2755 // Pick out the module name 2756 size_t module_len = module_equal - patch_mod_tail; 2757 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2758 if (module_name != NULL) { 2759 memcpy(module_name, patch_mod_tail, module_len); 2760 *(module_name + module_len) = '\0'; 2761 // The path piece begins one past the module_equal sign 2762 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2763 FREE_C_HEAP_ARRAY(char, module_name); 2764 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2765 return JNI_ENOMEM; 2766 } 2767 } else { 2768 return JNI_ENOMEM; 2769 } 2770 } 2771 return JNI_OK; 2772 } 2773 2774 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2775 // For match_option to return remaining or value part of option string 2776 const char* tail; 2777 2778 // iterate over arguments 2779 for (int index = 0; index < args->nOptions; index++) { 2780 bool is_absolute_path = false; // for -agentpath vs -agentlib 2781 2782 const JavaVMOption* option = args->options + index; 2783 2784 if (!match_option(option, "-Djava.class.path", &tail) && 2785 !match_option(option, "-Dsun.java.command", &tail) && 2786 !match_option(option, "-Dsun.java.launcher", &tail)) { 2787 2788 // add all jvm options to the jvm_args string. This string 2789 // is used later to set the java.vm.args PerfData string constant. 2790 // the -Djava.class.path and the -Dsun.java.command options are 2791 // omitted from jvm_args string as each have their own PerfData 2792 // string constant object. 2793 build_jvm_args(option->optionString); 2794 } 2795 2796 // -verbose:[class/module/gc/jni] 2797 if (match_option(option, "-verbose", &tail)) { 2798 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2799 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2800 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2801 } else if (!strcmp(tail, ":module")) { 2802 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2803 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2804 } else if (!strcmp(tail, ":gc")) { 2805 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2806 } else if (!strcmp(tail, ":jni")) { 2807 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2808 return JNI_EINVAL; 2809 } 2810 } 2811 // -da / -ea / -disableassertions / -enableassertions 2812 // These accept an optional class/package name separated by a colon, e.g., 2813 // -da:java.lang.Thread. 2814 } else if (match_option(option, user_assertion_options, &tail, true)) { 2815 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2816 if (*tail == '\0') { 2817 JavaAssertions::setUserClassDefault(enable); 2818 } else { 2819 assert(*tail == ':', "bogus match by match_option()"); 2820 JavaAssertions::addOption(tail + 1, enable); 2821 } 2822 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2823 } else if (match_option(option, system_assertion_options, &tail, false)) { 2824 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2825 JavaAssertions::setSystemClassDefault(enable); 2826 // -bootclasspath: 2827 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2828 jio_fprintf(defaultStream::output_stream(), 2829 "-Xbootclasspath is no longer a supported option.\n"); 2830 return JNI_EINVAL; 2831 // -bootclasspath/a: 2832 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2833 Arguments::append_sysclasspath(tail); 2834 // -bootclasspath/p: 2835 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2836 jio_fprintf(defaultStream::output_stream(), 2837 "-Xbootclasspath/p is no longer a supported option.\n"); 2838 return JNI_EINVAL; 2839 // -Xrun 2840 } else if (match_option(option, "-Xrun", &tail)) { 2841 if (tail != NULL) { 2842 const char* pos = strchr(tail, ':'); 2843 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2844 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2845 jio_snprintf(name, len + 1, "%s", tail); 2846 2847 char *options = NULL; 2848 if(pos != NULL) { 2849 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2850 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2851 } 2852 #if !INCLUDE_JVMTI 2853 if (strcmp(name, "jdwp") == 0) { 2854 jio_fprintf(defaultStream::error_stream(), 2855 "Debugging agents are not supported in this VM\n"); 2856 return JNI_ERR; 2857 } 2858 #endif // !INCLUDE_JVMTI 2859 add_init_library(name, options); 2860 } 2861 } else if (match_option(option, "--add-reads=", &tail)) { 2862 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2863 return JNI_ENOMEM; 2864 } 2865 } else if (match_option(option, "--add-exports=", &tail)) { 2866 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2867 return JNI_ENOMEM; 2868 } 2869 } else if (match_option(option, "--add-opens=", &tail)) { 2870 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2871 return JNI_ENOMEM; 2872 } 2873 } else if (match_option(option, "--add-modules=", &tail)) { 2874 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2875 return JNI_ENOMEM; 2876 } 2877 } else if (match_option(option, "--limit-modules=", &tail)) { 2878 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2879 return JNI_ENOMEM; 2880 } 2881 } else if (match_option(option, "--module-path=", &tail)) { 2882 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2883 return JNI_ENOMEM; 2884 } 2885 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2886 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2887 return JNI_ENOMEM; 2888 } 2889 } else if (match_option(option, "--patch-module=", &tail)) { 2890 // --patch-module=<module>=<file>(<pathsep><file>)* 2891 int res = process_patch_mod_option(tail, patch_mod_javabase); 2892 if (res != JNI_OK) { 2893 return res; 2894 } 2895 } else if (match_option(option, "--permit-illegal-access")) { 2896 if (!create_property("jdk.module.permitIllegalAccess", "true", ExternalProperty)) { 2897 return JNI_ENOMEM; 2898 } 2899 // -agentlib and -agentpath 2900 } else if (match_option(option, "-agentlib:", &tail) || 2901 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2902 if(tail != NULL) { 2903 const char* pos = strchr(tail, '='); 2904 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2905 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2906 name[len] = '\0'; 2907 2908 char *options = NULL; 2909 if(pos != NULL) { 2910 options = os::strdup_check_oom(pos + 1, mtArguments); 2911 } 2912 #if !INCLUDE_JVMTI 2913 if (valid_jdwp_agent(name, is_absolute_path)) { 2914 jio_fprintf(defaultStream::error_stream(), 2915 "Debugging agents are not supported in this VM\n"); 2916 return JNI_ERR; 2917 } 2918 #endif // !INCLUDE_JVMTI 2919 add_init_agent(name, options, is_absolute_path); 2920 } 2921 // -javaagent 2922 } else if (match_option(option, "-javaagent:", &tail)) { 2923 #if !INCLUDE_JVMTI 2924 jio_fprintf(defaultStream::error_stream(), 2925 "Instrumentation agents are not supported in this VM\n"); 2926 return JNI_ERR; 2927 #else 2928 if (tail != NULL) { 2929 size_t length = strlen(tail) + 1; 2930 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2931 jio_snprintf(options, length, "%s", tail); 2932 add_init_agent("instrument", options, false); 2933 // java agents need module java.instrument 2934 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2935 return JNI_ENOMEM; 2936 } 2937 } 2938 #endif // !INCLUDE_JVMTI 2939 // -Xnoclassgc 2940 } else if (match_option(option, "-Xnoclassgc")) { 2941 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2942 return JNI_EINVAL; 2943 } 2944 // -Xconcgc 2945 } else if (match_option(option, "-Xconcgc")) { 2946 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2947 return JNI_EINVAL; 2948 } 2949 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2950 // -Xnoconcgc 2951 } else if (match_option(option, "-Xnoconcgc")) { 2952 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2953 return JNI_EINVAL; 2954 } 2955 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2956 // -Xbatch 2957 } else if (match_option(option, "-Xbatch")) { 2958 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2959 return JNI_EINVAL; 2960 } 2961 // -Xmn for compatibility with other JVM vendors 2962 } else if (match_option(option, "-Xmn", &tail)) { 2963 julong long_initial_young_size = 0; 2964 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2965 if (errcode != arg_in_range) { 2966 jio_fprintf(defaultStream::error_stream(), 2967 "Invalid initial young generation size: %s\n", option->optionString); 2968 describe_range_error(errcode); 2969 return JNI_EINVAL; 2970 } 2971 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2972 return JNI_EINVAL; 2973 } 2974 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2975 return JNI_EINVAL; 2976 } 2977 // -Xms 2978 } else if (match_option(option, "-Xms", &tail)) { 2979 julong long_initial_heap_size = 0; 2980 // an initial heap size of 0 means automatically determine 2981 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2982 if (errcode != arg_in_range) { 2983 jio_fprintf(defaultStream::error_stream(), 2984 "Invalid initial heap size: %s\n", option->optionString); 2985 describe_range_error(errcode); 2986 return JNI_EINVAL; 2987 } 2988 set_min_heap_size((size_t)long_initial_heap_size); 2989 // Currently the minimum size and the initial heap sizes are the same. 2990 // Can be overridden with -XX:InitialHeapSize. 2991 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 // -Xmx 2995 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2996 julong long_max_heap_size = 0; 2997 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2998 if (errcode != arg_in_range) { 2999 jio_fprintf(defaultStream::error_stream(), 3000 "Invalid maximum heap size: %s\n", option->optionString); 3001 describe_range_error(errcode); 3002 return JNI_EINVAL; 3003 } 3004 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 3005 return JNI_EINVAL; 3006 } 3007 // Xmaxf 3008 } else if (match_option(option, "-Xmaxf", &tail)) { 3009 char* err; 3010 int maxf = (int)(strtod(tail, &err) * 100); 3011 if (*err != '\0' || *tail == '\0') { 3012 jio_fprintf(defaultStream::error_stream(), 3013 "Bad max heap free percentage size: %s\n", 3014 option->optionString); 3015 return JNI_EINVAL; 3016 } else { 3017 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 3018 return JNI_EINVAL; 3019 } 3020 } 3021 // Xminf 3022 } else if (match_option(option, "-Xminf", &tail)) { 3023 char* err; 3024 int minf = (int)(strtod(tail, &err) * 100); 3025 if (*err != '\0' || *tail == '\0') { 3026 jio_fprintf(defaultStream::error_stream(), 3027 "Bad min heap free percentage size: %s\n", 3028 option->optionString); 3029 return JNI_EINVAL; 3030 } else { 3031 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3032 return JNI_EINVAL; 3033 } 3034 } 3035 // -Xss 3036 } else if (match_option(option, "-Xss", &tail)) { 3037 julong long_ThreadStackSize = 0; 3038 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3039 if (errcode != arg_in_range) { 3040 jio_fprintf(defaultStream::error_stream(), 3041 "Invalid thread stack size: %s\n", option->optionString); 3042 describe_range_error(errcode); 3043 return JNI_EINVAL; 3044 } 3045 // Internally track ThreadStackSize in units of 1024 bytes. 3046 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 3047 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 3048 return JNI_EINVAL; 3049 } 3050 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 3051 } else if (match_option(option, "-Xoss", &tail) || 3052 match_option(option, "-Xsqnopause") || 3053 match_option(option, "-Xoptimize") || 3054 match_option(option, "-Xboundthreads") || 3055 match_option(option, "-Xusealtsigs")) { 3056 // All these options are deprecated in JDK 9 and will be removed in a future release 3057 char version[256]; 3058 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3059 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3060 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3061 julong long_CodeCacheExpansionSize = 0; 3062 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3063 if (errcode != arg_in_range) { 3064 jio_fprintf(defaultStream::error_stream(), 3065 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3066 os::vm_page_size()/K); 3067 return JNI_EINVAL; 3068 } 3069 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3070 return JNI_EINVAL; 3071 } 3072 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3073 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3074 julong long_ReservedCodeCacheSize = 0; 3075 3076 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3077 if (errcode != arg_in_range) { 3078 jio_fprintf(defaultStream::error_stream(), 3079 "Invalid maximum code cache size: %s.\n", option->optionString); 3080 return JNI_EINVAL; 3081 } 3082 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3083 return JNI_EINVAL; 3084 } 3085 // -XX:NonNMethodCodeHeapSize= 3086 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3087 julong long_NonNMethodCodeHeapSize = 0; 3088 3089 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3090 if (errcode != arg_in_range) { 3091 jio_fprintf(defaultStream::error_stream(), 3092 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3093 return JNI_EINVAL; 3094 } 3095 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3096 return JNI_EINVAL; 3097 } 3098 // -XX:ProfiledCodeHeapSize= 3099 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3100 julong long_ProfiledCodeHeapSize = 0; 3101 3102 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3103 if (errcode != arg_in_range) { 3104 jio_fprintf(defaultStream::error_stream(), 3105 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3106 return JNI_EINVAL; 3107 } 3108 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3109 return JNI_EINVAL; 3110 } 3111 // -XX:NonProfiledCodeHeapSizee= 3112 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3113 julong long_NonProfiledCodeHeapSize = 0; 3114 3115 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3116 if (errcode != arg_in_range) { 3117 jio_fprintf(defaultStream::error_stream(), 3118 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3119 return JNI_EINVAL; 3120 } 3121 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3122 return JNI_EINVAL; 3123 } 3124 // -green 3125 } else if (match_option(option, "-green")) { 3126 jio_fprintf(defaultStream::error_stream(), 3127 "Green threads support not available\n"); 3128 return JNI_EINVAL; 3129 // -native 3130 } else if (match_option(option, "-native")) { 3131 // HotSpot always uses native threads, ignore silently for compatibility 3132 // -Xrs 3133 } else if (match_option(option, "-Xrs")) { 3134 // Classic/EVM option, new functionality 3135 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3136 return JNI_EINVAL; 3137 } 3138 // -Xprof 3139 } else if (match_option(option, "-Xprof")) { 3140 #if INCLUDE_FPROF 3141 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release."); 3142 _has_profile = true; 3143 #else // INCLUDE_FPROF 3144 jio_fprintf(defaultStream::error_stream(), 3145 "Flat profiling is not supported in this VM.\n"); 3146 return JNI_ERR; 3147 #endif // INCLUDE_FPROF 3148 // -Xconcurrentio 3149 } else if (match_option(option, "-Xconcurrentio")) { 3150 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3151 return JNI_EINVAL; 3152 } 3153 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3154 return JNI_EINVAL; 3155 } 3156 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3157 return JNI_EINVAL; 3158 } 3159 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3160 return JNI_EINVAL; 3161 } 3162 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3163 return JNI_EINVAL; 3164 } 3165 3166 // -Xinternalversion 3167 } else if (match_option(option, "-Xinternalversion")) { 3168 jio_fprintf(defaultStream::output_stream(), "%s\n", 3169 VM_Version::internal_vm_info_string()); 3170 vm_exit(0); 3171 #ifndef PRODUCT 3172 // -Xprintflags 3173 } else if (match_option(option, "-Xprintflags")) { 3174 CommandLineFlags::printFlags(tty, false); 3175 vm_exit(0); 3176 #endif 3177 // -D 3178 } else if (match_option(option, "-D", &tail)) { 3179 const char* value; 3180 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3181 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3182 // abort if -Djava.endorsed.dirs is set 3183 jio_fprintf(defaultStream::output_stream(), 3184 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3185 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3186 return JNI_EINVAL; 3187 } 3188 if (match_option(option, "-Djava.ext.dirs=", &value) && 3189 *value != '\0' && strcmp(value, "\"\"") != 0) { 3190 // abort if -Djava.ext.dirs is set 3191 jio_fprintf(defaultStream::output_stream(), 3192 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3193 return JNI_EINVAL; 3194 } 3195 // Check for module related properties. They must be set using the modules 3196 // options. For example: use "--add-modules=java.sql", not 3197 // "-Djdk.module.addmods=java.sql" 3198 if (is_internal_module_property(option->optionString + 2)) { 3199 needs_module_property_warning = true; 3200 continue; 3201 } 3202 3203 if (!add_property(tail)) { 3204 return JNI_ENOMEM; 3205 } 3206 // Out of the box management support 3207 if (match_option(option, "-Dcom.sun.management", &tail)) { 3208 #if INCLUDE_MANAGEMENT 3209 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3210 return JNI_EINVAL; 3211 } 3212 // management agent in module jdk.management.agent 3213 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3214 return JNI_ENOMEM; 3215 } 3216 #else 3217 jio_fprintf(defaultStream::output_stream(), 3218 "-Dcom.sun.management is not supported in this VM.\n"); 3219 return JNI_ERR; 3220 #endif 3221 } 3222 // -Xint 3223 } else if (match_option(option, "-Xint")) { 3224 set_mode_flags(_int); 3225 // -Xmixed 3226 } else if (match_option(option, "-Xmixed")) { 3227 set_mode_flags(_mixed); 3228 // -Xcomp 3229 } else if (match_option(option, "-Xcomp")) { 3230 // for testing the compiler; turn off all flags that inhibit compilation 3231 set_mode_flags(_comp); 3232 // -Xshare:dump 3233 } else if (match_option(option, "-Xshare:dump")) { 3234 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3235 return JNI_EINVAL; 3236 } 3237 set_mode_flags(_int); // Prevent compilation, which creates objects 3238 // -Xshare:on 3239 } else if (match_option(option, "-Xshare:on")) { 3240 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3241 return JNI_EINVAL; 3242 } 3243 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3244 return JNI_EINVAL; 3245 } 3246 // -Xshare:auto 3247 } else if (match_option(option, "-Xshare:auto")) { 3248 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3249 return JNI_EINVAL; 3250 } 3251 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3252 return JNI_EINVAL; 3253 } 3254 // -Xshare:off 3255 } else if (match_option(option, "-Xshare:off")) { 3256 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3257 return JNI_EINVAL; 3258 } 3259 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3260 return JNI_EINVAL; 3261 } 3262 // -Xverify 3263 } else if (match_option(option, "-Xverify", &tail)) { 3264 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3265 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3266 return JNI_EINVAL; 3267 } 3268 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3269 return JNI_EINVAL; 3270 } 3271 } else if (strcmp(tail, ":remote") == 0) { 3272 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3273 return JNI_EINVAL; 3274 } 3275 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3276 return JNI_EINVAL; 3277 } 3278 } else if (strcmp(tail, ":none") == 0) { 3279 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3280 return JNI_EINVAL; 3281 } 3282 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3283 return JNI_EINVAL; 3284 } 3285 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3286 return JNI_EINVAL; 3287 } 3288 // -Xdebug 3289 } else if (match_option(option, "-Xdebug")) { 3290 // note this flag has been used, then ignore 3291 set_xdebug_mode(true); 3292 // -Xnoagent 3293 } else if (match_option(option, "-Xnoagent")) { 3294 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3295 } else if (match_option(option, "-Xloggc:", &tail)) { 3296 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3297 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3298 _gc_log_filename = os::strdup_check_oom(tail); 3299 } else if (match_option(option, "-Xlog", &tail)) { 3300 bool ret = false; 3301 if (strcmp(tail, ":help") == 0) { 3302 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3303 vm_exit(0); 3304 } else if (strcmp(tail, ":disable") == 0) { 3305 LogConfiguration::disable_logging(); 3306 ret = true; 3307 } else if (*tail == '\0') { 3308 ret = LogConfiguration::parse_command_line_arguments(); 3309 assert(ret, "-Xlog without arguments should never fail to parse"); 3310 } else if (*tail == ':') { 3311 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3312 } 3313 if (ret == false) { 3314 jio_fprintf(defaultStream::error_stream(), 3315 "Invalid -Xlog option '-Xlog%s'\n", 3316 tail); 3317 return JNI_EINVAL; 3318 } 3319 // JNI hooks 3320 } else if (match_option(option, "-Xcheck", &tail)) { 3321 if (!strcmp(tail, ":jni")) { 3322 #if !INCLUDE_JNI_CHECK 3323 warning("JNI CHECKING is not supported in this VM"); 3324 #else 3325 CheckJNICalls = true; 3326 #endif // INCLUDE_JNI_CHECK 3327 } else if (is_bad_option(option, args->ignoreUnrecognized, 3328 "check")) { 3329 return JNI_EINVAL; 3330 } 3331 } else if (match_option(option, "vfprintf")) { 3332 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3333 } else if (match_option(option, "exit")) { 3334 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3335 } else if (match_option(option, "abort")) { 3336 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3337 // -XX:+AggressiveHeap 3338 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3339 jint result = set_aggressive_heap_flags(); 3340 if (result != JNI_OK) { 3341 return result; 3342 } 3343 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3344 // and the last option wins. 3345 } else if (match_option(option, "-XX:+NeverTenure")) { 3346 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3347 return JNI_EINVAL; 3348 } 3349 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3350 return JNI_EINVAL; 3351 } 3352 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3353 return JNI_EINVAL; 3354 } 3355 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3356 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3357 return JNI_EINVAL; 3358 } 3359 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3360 return JNI_EINVAL; 3361 } 3362 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3363 return JNI_EINVAL; 3364 } 3365 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3366 uintx max_tenuring_thresh = 0; 3367 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3368 jio_fprintf(defaultStream::error_stream(), 3369 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3370 return JNI_EINVAL; 3371 } 3372 3373 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3374 return JNI_EINVAL; 3375 } 3376 3377 if (MaxTenuringThreshold == 0) { 3378 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3379 return JNI_EINVAL; 3380 } 3381 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3382 return JNI_EINVAL; 3383 } 3384 } else { 3385 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3386 return JNI_EINVAL; 3387 } 3388 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3389 return JNI_EINVAL; 3390 } 3391 } 3392 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3393 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3394 return JNI_EINVAL; 3395 } 3396 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3397 return JNI_EINVAL; 3398 } 3399 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3400 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3401 return JNI_EINVAL; 3402 } 3403 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3404 return JNI_EINVAL; 3405 } 3406 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3407 #if defined(DTRACE_ENABLED) 3408 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3409 return JNI_EINVAL; 3410 } 3411 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3412 return JNI_EINVAL; 3413 } 3414 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3415 return JNI_EINVAL; 3416 } 3417 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3418 return JNI_EINVAL; 3419 } 3420 #else // defined(DTRACE_ENABLED) 3421 jio_fprintf(defaultStream::error_stream(), 3422 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3423 return JNI_EINVAL; 3424 #endif // defined(DTRACE_ENABLED) 3425 #ifdef ASSERT 3426 } else if (match_option(option, "-XX:+FullGCALot")) { 3427 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3428 return JNI_EINVAL; 3429 } 3430 // disable scavenge before parallel mark-compact 3431 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3432 return JNI_EINVAL; 3433 } 3434 #endif 3435 #if !INCLUDE_MANAGEMENT 3436 } else if (match_option(option, "-XX:+ManagementServer")) { 3437 jio_fprintf(defaultStream::error_stream(), 3438 "ManagementServer is not supported in this VM.\n"); 3439 return JNI_ERR; 3440 #endif // INCLUDE_MANAGEMENT 3441 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3442 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3443 // already been handled 3444 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3445 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3446 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3447 return JNI_EINVAL; 3448 } 3449 } 3450 // Unknown option 3451 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3452 return JNI_ERR; 3453 } 3454 } 3455 3456 // PrintSharedArchiveAndExit will turn on 3457 // -Xshare:on 3458 // -Xlog:class+path=info 3459 if (PrintSharedArchiveAndExit) { 3460 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3461 return JNI_EINVAL; 3462 } 3463 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3464 return JNI_EINVAL; 3465 } 3466 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3467 } 3468 3469 // Change the default value for flags which have different default values 3470 // when working with older JDKs. 3471 #ifdef LINUX 3472 if (JDK_Version::current().compare_major(6) <= 0 && 3473 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3474 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3475 } 3476 #endif // LINUX 3477 fix_appclasspath(); 3478 return JNI_OK; 3479 } 3480 3481 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3482 // For java.base check for duplicate --patch-module options being specified on the command line. 3483 // This check is only required for java.base, all other duplicate module specifications 3484 // will be checked during module system initialization. The module system initialization 3485 // will throw an ExceptionInInitializerError if this situation occurs. 3486 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3487 if (*patch_mod_javabase) { 3488 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3489 } else { 3490 *patch_mod_javabase = true; 3491 } 3492 } 3493 3494 // Create GrowableArray lazily, only if --patch-module has been specified 3495 if (_patch_mod_prefix == NULL) { 3496 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3497 } 3498 3499 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3500 } 3501 3502 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3503 // 3504 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3505 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3506 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3507 // path is treated as the current directory. 3508 // 3509 // This causes problems with CDS, which requires that all directories specified in the classpath 3510 // must be empty. In most cases, applications do NOT want to load classes from the current 3511 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3512 // scripts compatible with CDS. 3513 void Arguments::fix_appclasspath() { 3514 if (IgnoreEmptyClassPaths) { 3515 const char separator = *os::path_separator(); 3516 const char* src = _java_class_path->value(); 3517 3518 // skip over all the leading empty paths 3519 while (*src == separator) { 3520 src ++; 3521 } 3522 3523 char* copy = os::strdup_check_oom(src, mtArguments); 3524 3525 // trim all trailing empty paths 3526 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3527 *tail = '\0'; 3528 } 3529 3530 char from[3] = {separator, separator, '\0'}; 3531 char to [2] = {separator, '\0'}; 3532 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3533 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3534 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3535 } 3536 3537 _java_class_path->set_writeable_value(copy); 3538 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3539 } 3540 } 3541 3542 static bool has_jar_files(const char* directory) { 3543 DIR* dir = os::opendir(directory); 3544 if (dir == NULL) return false; 3545 3546 struct dirent *entry; 3547 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3548 bool hasJarFile = false; 3549 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3550 const char* name = entry->d_name; 3551 const char* ext = name + strlen(name) - 4; 3552 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3553 } 3554 FREE_C_HEAP_ARRAY(char, dbuf); 3555 os::closedir(dir); 3556 return hasJarFile ; 3557 } 3558 3559 static int check_non_empty_dirs(const char* path) { 3560 const char separator = *os::path_separator(); 3561 const char* const end = path + strlen(path); 3562 int nonEmptyDirs = 0; 3563 while (path < end) { 3564 const char* tmp_end = strchr(path, separator); 3565 if (tmp_end == NULL) { 3566 if (has_jar_files(path)) { 3567 nonEmptyDirs++; 3568 jio_fprintf(defaultStream::output_stream(), 3569 "Non-empty directory: %s\n", path); 3570 } 3571 path = end; 3572 } else { 3573 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3574 memcpy(dirpath, path, tmp_end - path); 3575 dirpath[tmp_end - path] = '\0'; 3576 if (has_jar_files(dirpath)) { 3577 nonEmptyDirs++; 3578 jio_fprintf(defaultStream::output_stream(), 3579 "Non-empty directory: %s\n", dirpath); 3580 } 3581 FREE_C_HEAP_ARRAY(char, dirpath); 3582 path = tmp_end + 1; 3583 } 3584 } 3585 return nonEmptyDirs; 3586 } 3587 3588 jint Arguments::finalize_vm_init_args() { 3589 // check if the default lib/endorsed directory exists; if so, error 3590 char path[JVM_MAXPATHLEN]; 3591 const char* fileSep = os::file_separator(); 3592 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3593 3594 if (CheckEndorsedAndExtDirs) { 3595 int nonEmptyDirs = 0; 3596 // check endorsed directory 3597 nonEmptyDirs += check_non_empty_dirs(path); 3598 // check the extension directories 3599 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3600 if (nonEmptyDirs > 0) { 3601 return JNI_ERR; 3602 } 3603 } 3604 3605 DIR* dir = os::opendir(path); 3606 if (dir != NULL) { 3607 jio_fprintf(defaultStream::output_stream(), 3608 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3609 "in modular form will be supported via the concept of upgradeable modules.\n"); 3610 os::closedir(dir); 3611 return JNI_ERR; 3612 } 3613 3614 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3615 dir = os::opendir(path); 3616 if (dir != NULL) { 3617 jio_fprintf(defaultStream::output_stream(), 3618 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3619 "Use -classpath instead.\n."); 3620 os::closedir(dir); 3621 return JNI_ERR; 3622 } 3623 3624 // This must be done after all arguments have been processed. 3625 // java_compiler() true means set to "NONE" or empty. 3626 if (java_compiler() && !xdebug_mode()) { 3627 // For backwards compatibility, we switch to interpreted mode if 3628 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3629 // not specified. 3630 set_mode_flags(_int); 3631 } 3632 3633 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3634 // but like -Xint, leave compilation thresholds unaffected. 3635 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3636 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3637 set_mode_flags(_int); 3638 } 3639 3640 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3641 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3642 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3643 } 3644 3645 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3646 // Don't degrade server performance for footprint 3647 if (FLAG_IS_DEFAULT(UseLargePages) && 3648 MaxHeapSize < LargePageHeapSizeThreshold) { 3649 // No need for large granularity pages w/small heaps. 3650 // Note that large pages are enabled/disabled for both the 3651 // Java heap and the code cache. 3652 FLAG_SET_DEFAULT(UseLargePages, false); 3653 } 3654 3655 #elif defined(COMPILER2) 3656 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3657 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3658 } 3659 #endif 3660 3661 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3662 UNSUPPORTED_OPTION(ProfileInterpreter); 3663 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3664 #endif 3665 3666 #ifndef TIERED 3667 // Tiered compilation is undefined. 3668 UNSUPPORTED_OPTION(TieredCompilation); 3669 #endif 3670 3671 #if INCLUDE_JVMCI 3672 if (EnableJVMCI && 3673 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3674 return JNI_ENOMEM; 3675 } 3676 #endif 3677 3678 // If we are running in a headless jre, force java.awt.headless property 3679 // to be true unless the property has already been set. 3680 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3681 if (os::is_headless_jre()) { 3682 const char* headless = Arguments::get_property("java.awt.headless"); 3683 if (headless == NULL) { 3684 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3685 if (headless_env == NULL) { 3686 if (!add_property("java.awt.headless=true")) { 3687 return JNI_ENOMEM; 3688 } 3689 } else { 3690 char buffer[256]; 3691 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3692 if (!add_property(buffer)) { 3693 return JNI_ENOMEM; 3694 } 3695 } 3696 } 3697 } 3698 3699 if (!check_vm_args_consistency()) { 3700 return JNI_ERR; 3701 } 3702 3703 #if INCLUDE_JVMCI 3704 if (UseJVMCICompiler) { 3705 Compilation_mode = CompMode_server; 3706 } 3707 #endif 3708 3709 return JNI_OK; 3710 } 3711 3712 // Helper class for controlling the lifetime of JavaVMInitArgs 3713 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3714 // deleted on the destruction of the ScopedVMInitArgs object. 3715 class ScopedVMInitArgs : public StackObj { 3716 private: 3717 JavaVMInitArgs _args; 3718 char* _container_name; 3719 bool _is_set; 3720 char* _vm_options_file_arg; 3721 3722 public: 3723 ScopedVMInitArgs(const char *container_name) { 3724 _args.version = JNI_VERSION_1_2; 3725 _args.nOptions = 0; 3726 _args.options = NULL; 3727 _args.ignoreUnrecognized = false; 3728 _container_name = (char *)container_name; 3729 _is_set = false; 3730 _vm_options_file_arg = NULL; 3731 } 3732 3733 // Populates the JavaVMInitArgs object represented by this 3734 // ScopedVMInitArgs object with the arguments in options. The 3735 // allocated memory is deleted by the destructor. If this method 3736 // returns anything other than JNI_OK, then this object is in a 3737 // partially constructed state, and should be abandoned. 3738 jint set_args(GrowableArray<JavaVMOption>* options) { 3739 _is_set = true; 3740 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3741 JavaVMOption, options->length(), mtArguments); 3742 if (options_arr == NULL) { 3743 return JNI_ENOMEM; 3744 } 3745 _args.options = options_arr; 3746 3747 for (int i = 0; i < options->length(); i++) { 3748 options_arr[i] = options->at(i); 3749 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3750 if (options_arr[i].optionString == NULL) { 3751 // Rely on the destructor to do cleanup. 3752 _args.nOptions = i; 3753 return JNI_ENOMEM; 3754 } 3755 } 3756 3757 _args.nOptions = options->length(); 3758 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3759 return JNI_OK; 3760 } 3761 3762 JavaVMInitArgs* get() { return &_args; } 3763 char* container_name() { return _container_name; } 3764 bool is_set() { return _is_set; } 3765 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3766 char* vm_options_file_arg() { return _vm_options_file_arg; } 3767 3768 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3769 if (_vm_options_file_arg != NULL) { 3770 os::free(_vm_options_file_arg); 3771 } 3772 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3773 } 3774 3775 ~ScopedVMInitArgs() { 3776 if (_vm_options_file_arg != NULL) { 3777 os::free(_vm_options_file_arg); 3778 } 3779 if (_args.options == NULL) return; 3780 for (int i = 0; i < _args.nOptions; i++) { 3781 os::free(_args.options[i].optionString); 3782 } 3783 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3784 } 3785 3786 // Insert options into this option list, to replace option at 3787 // vm_options_file_pos (-XX:VMOptionsFile) 3788 jint insert(const JavaVMInitArgs* args, 3789 const JavaVMInitArgs* args_to_insert, 3790 const int vm_options_file_pos) { 3791 assert(_args.options == NULL, "shouldn't be set yet"); 3792 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3793 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3794 3795 int length = args->nOptions + args_to_insert->nOptions - 1; 3796 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3797 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3798 for (int i = 0; i < args->nOptions; i++) { 3799 if (i == vm_options_file_pos) { 3800 // insert the new options starting at the same place as the 3801 // -XX:VMOptionsFile option 3802 for (int j = 0; j < args_to_insert->nOptions; j++) { 3803 options->push(args_to_insert->options[j]); 3804 } 3805 } else { 3806 options->push(args->options[i]); 3807 } 3808 } 3809 // make into options array 3810 jint result = set_args(options); 3811 delete options; 3812 return result; 3813 } 3814 }; 3815 3816 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3817 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3818 } 3819 3820 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3821 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3822 } 3823 3824 jint Arguments::parse_options_environment_variable(const char* name, 3825 ScopedVMInitArgs* vm_args) { 3826 char *buffer = ::getenv(name); 3827 3828 // Don't check this environment variable if user has special privileges 3829 // (e.g. unix su command). 3830 if (buffer == NULL || os::have_special_privileges()) { 3831 return JNI_OK; 3832 } 3833 3834 if ((buffer = os::strdup(buffer)) == NULL) { 3835 return JNI_ENOMEM; 3836 } 3837 3838 jio_fprintf(defaultStream::error_stream(), 3839 "Picked up %s: %s\n", name, buffer); 3840 3841 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3842 3843 os::free(buffer); 3844 return retcode; 3845 } 3846 3847 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3848 // read file into buffer 3849 int fd = ::open(file_name, O_RDONLY); 3850 if (fd < 0) { 3851 jio_fprintf(defaultStream::error_stream(), 3852 "Could not open options file '%s'\n", 3853 file_name); 3854 return JNI_ERR; 3855 } 3856 3857 struct stat stbuf; 3858 int retcode = os::stat(file_name, &stbuf); 3859 if (retcode != 0) { 3860 jio_fprintf(defaultStream::error_stream(), 3861 "Could not stat options file '%s'\n", 3862 file_name); 3863 os::close(fd); 3864 return JNI_ERR; 3865 } 3866 3867 if (stbuf.st_size == 0) { 3868 // tell caller there is no option data and that is ok 3869 os::close(fd); 3870 return JNI_OK; 3871 } 3872 3873 // '+ 1' for NULL termination even with max bytes 3874 size_t bytes_alloc = stbuf.st_size + 1; 3875 3876 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3877 if (NULL == buf) { 3878 jio_fprintf(defaultStream::error_stream(), 3879 "Could not allocate read buffer for options file parse\n"); 3880 os::close(fd); 3881 return JNI_ENOMEM; 3882 } 3883 3884 memset(buf, 0, bytes_alloc); 3885 3886 // Fill buffer 3887 // Use ::read() instead of os::read because os::read() 3888 // might do a thread state transition 3889 // and it is too early for that here 3890 3891 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3892 os::close(fd); 3893 if (bytes_read < 0) { 3894 FREE_C_HEAP_ARRAY(char, buf); 3895 jio_fprintf(defaultStream::error_stream(), 3896 "Could not read options file '%s'\n", file_name); 3897 return JNI_ERR; 3898 } 3899 3900 if (bytes_read == 0) { 3901 // tell caller there is no option data and that is ok 3902 FREE_C_HEAP_ARRAY(char, buf); 3903 return JNI_OK; 3904 } 3905 3906 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3907 3908 FREE_C_HEAP_ARRAY(char, buf); 3909 return retcode; 3910 } 3911 3912 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3913 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3914 3915 // some pointers to help with parsing 3916 char *buffer_end = buffer + buf_len; 3917 char *opt_hd = buffer; 3918 char *wrt = buffer; 3919 char *rd = buffer; 3920 3921 // parse all options 3922 while (rd < buffer_end) { 3923 // skip leading white space from the input string 3924 while (rd < buffer_end && isspace(*rd)) { 3925 rd++; 3926 } 3927 3928 if (rd >= buffer_end) { 3929 break; 3930 } 3931 3932 // Remember this is where we found the head of the token. 3933 opt_hd = wrt; 3934 3935 // Tokens are strings of non white space characters separated 3936 // by one or more white spaces. 3937 while (rd < buffer_end && !isspace(*rd)) { 3938 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3939 int quote = *rd; // matching quote to look for 3940 rd++; // don't copy open quote 3941 while (rd < buffer_end && *rd != quote) { 3942 // include everything (even spaces) 3943 // up until the close quote 3944 *wrt++ = *rd++; // copy to option string 3945 } 3946 3947 if (rd < buffer_end) { 3948 rd++; // don't copy close quote 3949 } else { 3950 // did not see closing quote 3951 jio_fprintf(defaultStream::error_stream(), 3952 "Unmatched quote in %s\n", name); 3953 delete options; 3954 return JNI_ERR; 3955 } 3956 } else { 3957 *wrt++ = *rd++; // copy to option string 3958 } 3959 } 3960 3961 // steal a white space character and set it to NULL 3962 *wrt++ = '\0'; 3963 // We now have a complete token 3964 3965 JavaVMOption option; 3966 option.optionString = opt_hd; 3967 option.extraInfo = NULL; 3968 3969 options->append(option); // Fill in option 3970 3971 rd++; // Advance to next character 3972 } 3973 3974 // Fill out JavaVMInitArgs structure. 3975 jint status = vm_args->set_args(options); 3976 3977 delete options; 3978 return status; 3979 } 3980 3981 void Arguments::set_shared_spaces_flags() { 3982 if (DumpSharedSpaces) { 3983 if (FailOverToOldVerifier) { 3984 // Don't fall back to the old verifier on verification failure. If a 3985 // class fails verification with the split verifier, it might fail the 3986 // CDS runtime verifier constraint check. In that case, we don't want 3987 // to share the class. We only archive classes that pass the split verifier. 3988 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3989 } 3990 3991 if (RequireSharedSpaces) { 3992 warning("Cannot dump shared archive while using shared archive"); 3993 } 3994 UseSharedSpaces = false; 3995 #ifdef _LP64 3996 if (!UseCompressedOops || !UseCompressedClassPointers) { 3997 vm_exit_during_initialization( 3998 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3999 } 4000 } else { 4001 if (!UseCompressedOops || !UseCompressedClassPointers) { 4002 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 4003 } 4004 #endif 4005 } 4006 } 4007 4008 // Sharing support 4009 // Construct the path to the archive 4010 static char* get_shared_archive_path() { 4011 char *shared_archive_path; 4012 if (SharedArchiveFile == NULL) { 4013 char jvm_path[JVM_MAXPATHLEN]; 4014 os::jvm_path(jvm_path, sizeof(jvm_path)); 4015 char *end = strrchr(jvm_path, *os::file_separator()); 4016 if (end != NULL) *end = '\0'; 4017 size_t jvm_path_len = strlen(jvm_path); 4018 size_t file_sep_len = strlen(os::file_separator()); 4019 const size_t len = jvm_path_len + file_sep_len + 20; 4020 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 4021 if (shared_archive_path != NULL) { 4022 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 4023 jvm_path, os::file_separator()); 4024 } 4025 } else { 4026 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 4027 } 4028 return shared_archive_path; 4029 } 4030 4031 #ifndef PRODUCT 4032 // Determine whether LogVMOutput should be implicitly turned on. 4033 static bool use_vm_log() { 4034 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4035 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4036 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4037 PrintAssembly || TraceDeoptimization || TraceDependencies || 4038 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4039 return true; 4040 } 4041 4042 #ifdef COMPILER1 4043 if (PrintC1Statistics) { 4044 return true; 4045 } 4046 #endif // COMPILER1 4047 4048 #ifdef COMPILER2 4049 if (PrintOptoAssembly || PrintOptoStatistics) { 4050 return true; 4051 } 4052 #endif // COMPILER2 4053 4054 return false; 4055 } 4056 4057 #endif // PRODUCT 4058 4059 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4060 for (int index = 0; index < args->nOptions; index++) { 4061 const JavaVMOption* option = args->options + index; 4062 const char* tail; 4063 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4064 return true; 4065 } 4066 } 4067 return false; 4068 } 4069 4070 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4071 const char* vm_options_file, 4072 const int vm_options_file_pos, 4073 ScopedVMInitArgs* vm_options_file_args, 4074 ScopedVMInitArgs* args_out) { 4075 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4076 if (code != JNI_OK) { 4077 return code; 4078 } 4079 4080 if (vm_options_file_args->get()->nOptions < 1) { 4081 return JNI_OK; 4082 } 4083 4084 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4085 jio_fprintf(defaultStream::error_stream(), 4086 "A VM options file may not refer to a VM options file. " 4087 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4088 "options file '%s' in options container '%s' is an error.\n", 4089 vm_options_file_args->vm_options_file_arg(), 4090 vm_options_file_args->container_name()); 4091 return JNI_EINVAL; 4092 } 4093 4094 return args_out->insert(args, vm_options_file_args->get(), 4095 vm_options_file_pos); 4096 } 4097 4098 // Expand -XX:VMOptionsFile found in args_in as needed. 4099 // mod_args and args_out parameters may return values as needed. 4100 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4101 ScopedVMInitArgs* mod_args, 4102 JavaVMInitArgs** args_out) { 4103 jint code = match_special_option_and_act(args_in, mod_args); 4104 if (code != JNI_OK) { 4105 return code; 4106 } 4107 4108 if (mod_args->is_set()) { 4109 // args_in contains -XX:VMOptionsFile and mod_args contains the 4110 // original options from args_in along with the options expanded 4111 // from the VMOptionsFile. Return a short-hand to the caller. 4112 *args_out = mod_args->get(); 4113 } else { 4114 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4115 } 4116 return JNI_OK; 4117 } 4118 4119 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4120 ScopedVMInitArgs* args_out) { 4121 // Remaining part of option string 4122 const char* tail; 4123 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4124 4125 for (int index = 0; index < args->nOptions; index++) { 4126 const JavaVMOption* option = args->options + index; 4127 if (ArgumentsExt::process_options(option)) { 4128 continue; 4129 } 4130 if (match_option(option, "-XX:Flags=", &tail)) { 4131 Arguments::set_jvm_flags_file(tail); 4132 continue; 4133 } 4134 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4135 if (vm_options_file_args.found_vm_options_file_arg()) { 4136 jio_fprintf(defaultStream::error_stream(), 4137 "The option '%s' is already specified in the options " 4138 "container '%s' so the specification of '%s' in the " 4139 "same options container is an error.\n", 4140 vm_options_file_args.vm_options_file_arg(), 4141 vm_options_file_args.container_name(), 4142 option->optionString); 4143 return JNI_EINVAL; 4144 } 4145 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4146 // If there's a VMOptionsFile, parse that 4147 jint code = insert_vm_options_file(args, tail, index, 4148 &vm_options_file_args, args_out); 4149 if (code != JNI_OK) { 4150 return code; 4151 } 4152 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4153 if (args_out->is_set()) { 4154 // The VMOptions file inserted some options so switch 'args' 4155 // to the new set of options, and continue processing which 4156 // preserves "last option wins" semantics. 4157 args = args_out->get(); 4158 // The first option from the VMOptionsFile replaces the 4159 // current option. So we back track to process the 4160 // replacement option. 4161 index--; 4162 } 4163 continue; 4164 } 4165 if (match_option(option, "-XX:+PrintVMOptions")) { 4166 PrintVMOptions = true; 4167 continue; 4168 } 4169 if (match_option(option, "-XX:-PrintVMOptions")) { 4170 PrintVMOptions = false; 4171 continue; 4172 } 4173 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4174 IgnoreUnrecognizedVMOptions = true; 4175 continue; 4176 } 4177 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4178 IgnoreUnrecognizedVMOptions = false; 4179 continue; 4180 } 4181 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4182 CommandLineFlags::printFlags(tty, false); 4183 vm_exit(0); 4184 } 4185 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4186 #if INCLUDE_NMT 4187 // The launcher did not setup nmt environment variable properly. 4188 if (!MemTracker::check_launcher_nmt_support(tail)) { 4189 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4190 } 4191 4192 // Verify if nmt option is valid. 4193 if (MemTracker::verify_nmt_option()) { 4194 // Late initialization, still in single-threaded mode. 4195 if (MemTracker::tracking_level() >= NMT_summary) { 4196 MemTracker::init(); 4197 } 4198 } else { 4199 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4200 } 4201 continue; 4202 #else 4203 jio_fprintf(defaultStream::error_stream(), 4204 "Native Memory Tracking is not supported in this VM\n"); 4205 return JNI_ERR; 4206 #endif 4207 } 4208 4209 #ifndef PRODUCT 4210 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4211 CommandLineFlags::printFlags(tty, true); 4212 vm_exit(0); 4213 } 4214 #endif 4215 } 4216 return JNI_OK; 4217 } 4218 4219 static void print_options(const JavaVMInitArgs *args) { 4220 const char* tail; 4221 for (int index = 0; index < args->nOptions; index++) { 4222 const JavaVMOption *option = args->options + index; 4223 if (match_option(option, "-XX:", &tail)) { 4224 logOption(tail); 4225 } 4226 } 4227 } 4228 4229 bool Arguments::handle_deprecated_print_gc_flags() { 4230 if (PrintGC) { 4231 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4232 } 4233 if (PrintGCDetails) { 4234 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4235 } 4236 4237 if (_gc_log_filename != NULL) { 4238 // -Xloggc was used to specify a filename 4239 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4240 4241 LogTarget(Error, logging) target; 4242 LogStreamCHeap errstream(target); 4243 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4244 } else if (PrintGC || PrintGCDetails) { 4245 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4246 } 4247 return true; 4248 } 4249 4250 void Arguments::handle_extra_cms_flags(const char* msg) { 4251 SpecialFlag flag; 4252 const char *flag_name = "UseConcMarkSweepGC"; 4253 if (lookup_special_flag(flag_name, flag)) { 4254 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4255 warning("%s", msg); 4256 } 4257 } 4258 4259 // Parse entry point called from JNI_CreateJavaVM 4260 4261 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4262 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4263 4264 // Initialize ranges, constraints and writeables 4265 CommandLineFlagRangeList::init(); 4266 CommandLineFlagConstraintList::init(); 4267 CommandLineFlagWriteableList::init(); 4268 4269 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4270 const char* hotspotrc = ".hotspotrc"; 4271 bool settings_file_specified = false; 4272 bool needs_hotspotrc_warning = false; 4273 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4274 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4275 4276 // Pointers to current working set of containers 4277 JavaVMInitArgs* cur_cmd_args; 4278 JavaVMInitArgs* cur_java_options_args; 4279 JavaVMInitArgs* cur_java_tool_options_args; 4280 4281 // Containers for modified/expanded options 4282 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4283 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4284 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4285 4286 4287 jint code = 4288 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4289 if (code != JNI_OK) { 4290 return code; 4291 } 4292 4293 code = parse_java_options_environment_variable(&initial_java_options_args); 4294 if (code != JNI_OK) { 4295 return code; 4296 } 4297 4298 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4299 &mod_java_tool_options_args, 4300 &cur_java_tool_options_args); 4301 if (code != JNI_OK) { 4302 return code; 4303 } 4304 4305 code = expand_vm_options_as_needed(initial_cmd_args, 4306 &mod_cmd_args, 4307 &cur_cmd_args); 4308 if (code != JNI_OK) { 4309 return code; 4310 } 4311 4312 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4313 &mod_java_options_args, 4314 &cur_java_options_args); 4315 if (code != JNI_OK) { 4316 return code; 4317 } 4318 4319 const char* flags_file = Arguments::get_jvm_flags_file(); 4320 settings_file_specified = (flags_file != NULL); 4321 4322 if (IgnoreUnrecognizedVMOptions) { 4323 cur_cmd_args->ignoreUnrecognized = true; 4324 cur_java_tool_options_args->ignoreUnrecognized = true; 4325 cur_java_options_args->ignoreUnrecognized = true; 4326 } 4327 4328 // Parse specified settings file 4329 if (settings_file_specified) { 4330 if (!process_settings_file(flags_file, true, 4331 cur_cmd_args->ignoreUnrecognized)) { 4332 return JNI_EINVAL; 4333 } 4334 } else { 4335 #ifdef ASSERT 4336 // Parse default .hotspotrc settings file 4337 if (!process_settings_file(".hotspotrc", false, 4338 cur_cmd_args->ignoreUnrecognized)) { 4339 return JNI_EINVAL; 4340 } 4341 #else 4342 struct stat buf; 4343 if (os::stat(hotspotrc, &buf) == 0) { 4344 needs_hotspotrc_warning = true; 4345 } 4346 #endif 4347 } 4348 4349 if (PrintVMOptions) { 4350 print_options(cur_java_tool_options_args); 4351 print_options(cur_cmd_args); 4352 print_options(cur_java_options_args); 4353 } 4354 4355 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4356 jint result = parse_vm_init_args(cur_java_tool_options_args, 4357 cur_java_options_args, 4358 cur_cmd_args); 4359 4360 if (result != JNI_OK) { 4361 return result; 4362 } 4363 4364 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4365 SharedArchivePath = get_shared_archive_path(); 4366 if (SharedArchivePath == NULL) { 4367 return JNI_ENOMEM; 4368 } 4369 4370 // Set up VerifySharedSpaces 4371 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4372 VerifySharedSpaces = true; 4373 } 4374 4375 // Delay warning until here so that we've had a chance to process 4376 // the -XX:-PrintWarnings flag 4377 if (needs_hotspotrc_warning) { 4378 warning("%s file is present but has been ignored. " 4379 "Run with -XX:Flags=%s to load the file.", 4380 hotspotrc, hotspotrc); 4381 } 4382 4383 if (needs_module_property_warning) { 4384 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4385 " names that are reserved for internal use."); 4386 } 4387 4388 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4389 UNSUPPORTED_OPTION(UseLargePages); 4390 #endif 4391 4392 ArgumentsExt::report_unsupported_options(); 4393 4394 #ifndef PRODUCT 4395 if (TraceBytecodesAt != 0) { 4396 TraceBytecodes = true; 4397 } 4398 if (CountCompiledCalls) { 4399 if (UseCounterDecay) { 4400 warning("UseCounterDecay disabled because CountCalls is set"); 4401 UseCounterDecay = false; 4402 } 4403 } 4404 #endif // PRODUCT 4405 4406 if (ScavengeRootsInCode == 0) { 4407 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4408 warning("Forcing ScavengeRootsInCode non-zero"); 4409 } 4410 ScavengeRootsInCode = 1; 4411 } 4412 4413 if (!handle_deprecated_print_gc_flags()) { 4414 return JNI_EINVAL; 4415 } 4416 4417 // Set object alignment values. 4418 set_object_alignment(); 4419 4420 #if !INCLUDE_CDS 4421 if (DumpSharedSpaces || RequireSharedSpaces) { 4422 jio_fprintf(defaultStream::error_stream(), 4423 "Shared spaces are not supported in this VM\n"); 4424 return JNI_ERR; 4425 } 4426 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4427 warning("Shared spaces are not supported in this VM"); 4428 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4429 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4430 } 4431 no_shared_spaces("CDS Disabled"); 4432 #endif // INCLUDE_CDS 4433 4434 return JNI_OK; 4435 } 4436 4437 jint Arguments::apply_ergo() { 4438 // Set flags based on ergonomics. 4439 set_ergonomics_flags(); 4440 4441 #if INCLUDE_JVMCI 4442 set_jvmci_specific_flags(); 4443 #endif 4444 4445 set_shared_spaces_flags(); 4446 4447 // Check the GC selections again. 4448 if (!check_gc_consistency()) { 4449 return JNI_EINVAL; 4450 } 4451 4452 if (TieredCompilation) { 4453 set_tiered_flags(); 4454 } else { 4455 int max_compilation_policy_choice = 1; 4456 #ifdef COMPILER2 4457 if (is_server_compilation_mode_vm()) { 4458 max_compilation_policy_choice = 2; 4459 } 4460 #endif 4461 // Check if the policy is valid. 4462 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4463 vm_exit_during_initialization( 4464 "Incompatible compilation policy selected", NULL); 4465 } 4466 // Scale CompileThreshold 4467 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4468 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4469 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4470 } 4471 } 4472 4473 #ifdef COMPILER2 4474 #ifndef PRODUCT 4475 if (PrintIdealGraphLevel > 0) { 4476 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4477 } 4478 #endif 4479 #endif 4480 4481 // Set heap size based on available physical memory 4482 set_heap_size(); 4483 4484 ArgumentsExt::set_gc_specific_flags(); 4485 4486 // Initialize Metaspace flags and alignments 4487 Metaspace::ergo_initialize(); 4488 4489 // Set bytecode rewriting flags 4490 set_bytecode_flags(); 4491 4492 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4493 jint code = set_aggressive_opts_flags(); 4494 if (code != JNI_OK) { 4495 return code; 4496 } 4497 4498 // Turn off biased locking for locking debug mode flags, 4499 // which are subtly different from each other but neither works with 4500 // biased locking 4501 if (UseHeavyMonitors 4502 #ifdef COMPILER1 4503 || !UseFastLocking 4504 #endif // COMPILER1 4505 #if INCLUDE_JVMCI 4506 || !JVMCIUseFastLocking 4507 #endif 4508 ) { 4509 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4510 // flag set to true on command line; warn the user that they 4511 // can't enable biased locking here 4512 warning("Biased Locking is not supported with locking debug flags" 4513 "; ignoring UseBiasedLocking flag." ); 4514 } 4515 UseBiasedLocking = false; 4516 } 4517 4518 #ifdef CC_INTERP 4519 // Clear flags not supported on zero. 4520 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4521 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4522 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4523 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4524 #endif // CC_INTERP 4525 4526 #ifdef COMPILER2 4527 if (!EliminateLocks) { 4528 EliminateNestedLocks = false; 4529 } 4530 if (!Inline) { 4531 IncrementalInline = false; 4532 } 4533 #ifndef PRODUCT 4534 if (!IncrementalInline) { 4535 AlwaysIncrementalInline = false; 4536 } 4537 #endif 4538 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4539 // nothing to use the profiling, turn if off 4540 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4541 } 4542 #endif 4543 4544 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4545 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4546 DebugNonSafepoints = true; 4547 } 4548 4549 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4550 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4551 } 4552 4553 if (UseOnStackReplacement && !UseLoopCounter) { 4554 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4555 FLAG_SET_DEFAULT(UseLoopCounter, true); 4556 } 4557 4558 #ifndef PRODUCT 4559 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4560 if (use_vm_log()) { 4561 LogVMOutput = true; 4562 } 4563 } 4564 #endif // PRODUCT 4565 4566 if (PrintCommandLineFlags) { 4567 CommandLineFlags::printSetFlags(tty); 4568 } 4569 4570 // Apply CPU specific policy for the BiasedLocking 4571 if (UseBiasedLocking) { 4572 if (!VM_Version::use_biased_locking() && 4573 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4574 UseBiasedLocking = false; 4575 } 4576 } 4577 #ifdef COMPILER2 4578 if (!UseBiasedLocking || EmitSync != 0) { 4579 UseOptoBiasInlining = false; 4580 } 4581 #endif 4582 4583 return JNI_OK; 4584 } 4585 4586 jint Arguments::adjust_after_os() { 4587 if (UseNUMA) { 4588 if (UseParallelGC || UseParallelOldGC) { 4589 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4590 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4591 } 4592 } 4593 // UseNUMAInterleaving is set to ON for all collectors and 4594 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4595 // such as the parallel collector for Linux and Solaris will 4596 // interleave old gen and survivor spaces on top of NUMA 4597 // allocation policy for the eden space. 4598 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4599 // all platforms and ParallelGC on Windows will interleave all 4600 // of the heap spaces across NUMA nodes. 4601 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4602 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4603 } 4604 } 4605 return JNI_OK; 4606 } 4607 4608 int Arguments::PropertyList_count(SystemProperty* pl) { 4609 int count = 0; 4610 while(pl != NULL) { 4611 count++; 4612 pl = pl->next(); 4613 } 4614 return count; 4615 } 4616 4617 // Return the number of readable properties. 4618 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4619 int count = 0; 4620 while(pl != NULL) { 4621 if (pl->is_readable()) { 4622 count++; 4623 } 4624 pl = pl->next(); 4625 } 4626 return count; 4627 } 4628 4629 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4630 assert(key != NULL, "just checking"); 4631 SystemProperty* prop; 4632 for (prop = pl; prop != NULL; prop = prop->next()) { 4633 if (strcmp(key, prop->key()) == 0) return prop->value(); 4634 } 4635 return NULL; 4636 } 4637 4638 // Return the value of the requested property provided that it is a readable property. 4639 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4640 assert(key != NULL, "just checking"); 4641 SystemProperty* prop; 4642 // Return the property value if the keys match and the property is not internal or 4643 // it's the special internal property "jdk.boot.class.path.append". 4644 for (prop = pl; prop != NULL; prop = prop->next()) { 4645 if (strcmp(key, prop->key()) == 0) { 4646 if (!prop->internal()) { 4647 return prop->value(); 4648 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4649 return prop->value(); 4650 } else { 4651 // Property is internal and not jdk.boot.class.path.append so return NULL. 4652 return NULL; 4653 } 4654 } 4655 } 4656 return NULL; 4657 } 4658 4659 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4660 int count = 0; 4661 const char* ret_val = NULL; 4662 4663 while(pl != NULL) { 4664 if(count >= index) { 4665 ret_val = pl->key(); 4666 break; 4667 } 4668 count++; 4669 pl = pl->next(); 4670 } 4671 4672 return ret_val; 4673 } 4674 4675 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4676 int count = 0; 4677 char* ret_val = NULL; 4678 4679 while(pl != NULL) { 4680 if(count >= index) { 4681 ret_val = pl->value(); 4682 break; 4683 } 4684 count++; 4685 pl = pl->next(); 4686 } 4687 4688 return ret_val; 4689 } 4690 4691 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4692 SystemProperty* p = *plist; 4693 if (p == NULL) { 4694 *plist = new_p; 4695 } else { 4696 while (p->next() != NULL) { 4697 p = p->next(); 4698 } 4699 p->set_next(new_p); 4700 } 4701 } 4702 4703 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4704 bool writeable, bool internal) { 4705 if (plist == NULL) 4706 return; 4707 4708 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4709 PropertyList_add(plist, new_p); 4710 } 4711 4712 void Arguments::PropertyList_add(SystemProperty *element) { 4713 PropertyList_add(&_system_properties, element); 4714 } 4715 4716 // This add maintains unique property key in the list. 4717 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4718 PropertyAppendable append, PropertyWriteable writeable, 4719 PropertyInternal internal) { 4720 if (plist == NULL) 4721 return; 4722 4723 // If property key exist then update with new value. 4724 SystemProperty* prop; 4725 for (prop = *plist; prop != NULL; prop = prop->next()) { 4726 if (strcmp(k, prop->key()) == 0) { 4727 if (append == AppendProperty) { 4728 prop->append_value(v); 4729 } else { 4730 prop->set_value(v); 4731 } 4732 return; 4733 } 4734 } 4735 4736 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4737 } 4738 4739 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4740 // Returns true if all of the source pointed by src has been copied over to 4741 // the destination buffer pointed by buf. Otherwise, returns false. 4742 // Notes: 4743 // 1. If the length (buflen) of the destination buffer excluding the 4744 // NULL terminator character is not long enough for holding the expanded 4745 // pid characters, it also returns false instead of returning the partially 4746 // expanded one. 4747 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4748 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4749 char* buf, size_t buflen) { 4750 const char* p = src; 4751 char* b = buf; 4752 const char* src_end = &src[srclen]; 4753 char* buf_end = &buf[buflen - 1]; 4754 4755 while (p < src_end && b < buf_end) { 4756 if (*p == '%') { 4757 switch (*(++p)) { 4758 case '%': // "%%" ==> "%" 4759 *b++ = *p++; 4760 break; 4761 case 'p': { // "%p" ==> current process id 4762 // buf_end points to the character before the last character so 4763 // that we could write '\0' to the end of the buffer. 4764 size_t buf_sz = buf_end - b + 1; 4765 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4766 4767 // if jio_snprintf fails or the buffer is not long enough to hold 4768 // the expanded pid, returns false. 4769 if (ret < 0 || ret >= (int)buf_sz) { 4770 return false; 4771 } else { 4772 b += ret; 4773 assert(*b == '\0', "fail in copy_expand_pid"); 4774 if (p == src_end && b == buf_end + 1) { 4775 // reach the end of the buffer. 4776 return true; 4777 } 4778 } 4779 p++; 4780 break; 4781 } 4782 default : 4783 *b++ = '%'; 4784 } 4785 } else { 4786 *b++ = *p++; 4787 } 4788 } 4789 *b = '\0'; 4790 return (p == src_end); // return false if not all of the source was copied 4791 }