1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/moduleEntry.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genCollectedHeap.hpp" 33 #include "gc/shared/referenceProcessor.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/arguments_ext.hpp" 45 #include "runtime/commandLineFlagConstraintList.hpp" 46 #include "runtime/commandLineFlagWriteableList.hpp" 47 #include "runtime/commandLineFlagRangeList.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/globals_extension.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/defaultStream.hpp" 56 #include "utilities/macros.hpp" 57 #include "utilities/stringUtils.hpp" 58 #if INCLUDE_JVMCI 59 #include "jvmci/jvmciRuntime.hpp" 60 #endif 61 #if INCLUDE_ALL_GCS 62 #include "gc/cms/compactibleFreeListSpace.hpp" 63 #include "gc/g1/g1CollectedHeap.inline.hpp" 64 #include "gc/parallel/parallelScavengeHeap.hpp" 65 #endif // INCLUDE_ALL_GCS 66 67 // Note: This is a special bug reporting site for the JVM 68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 bool Arguments::_has_profile = false; 80 size_t Arguments::_conservative_max_heap_alignment = 0; 81 size_t Arguments::_min_heap_size = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args() 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98 char* Arguments::SharedArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 abort_hook_t Arguments::_abort_hook = NULL; 104 exit_hook_t Arguments::_exit_hook = NULL; 105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108 SystemProperty *Arguments::_sun_boot_library_path = NULL; 109 SystemProperty *Arguments::_java_library_path = NULL; 110 SystemProperty *Arguments::_java_home = NULL; 111 SystemProperty *Arguments::_java_class_path = NULL; 112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 113 114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 115 PathString *Arguments::_system_boot_class_path = NULL; 116 bool Arguments::_has_jimage = false; 117 118 char* Arguments::_ext_dirs = NULL; 119 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 121 // part of the option string. 122 static bool match_option(const JavaVMOption *option, const char* name, 123 const char** tail) { 124 size_t len = strlen(name); 125 if (strncmp(option->optionString, name, len) == 0) { 126 *tail = option->optionString + len; 127 return true; 128 } else { 129 return false; 130 } 131 } 132 133 // Check if 'option' matches 'name'. No "tail" is allowed. 134 static bool match_option(const JavaVMOption *option, const char* name) { 135 const char* tail = NULL; 136 bool result = match_option(option, name, &tail); 137 if (tail != NULL && *tail == '\0') { 138 return result; 139 } else { 140 return false; 141 } 142 } 143 144 // Return true if any of the strings in null-terminated array 'names' matches. 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 146 // the option must match exactly. 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 148 bool tail_allowed) { 149 for (/* empty */; *names != NULL; ++names) { 150 if (match_option(option, *names, tail)) { 151 if (**tail == '\0' || tail_allowed && **tail == ':') { 152 return true; 153 } 154 } 155 } 156 return false; 157 } 158 159 static void logOption(const char* opt) { 160 if (PrintVMOptions) { 161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 162 } 163 } 164 165 bool needs_module_property_warning = false; 166 167 #define MODULE_PROPERTY_PREFIX "jdk.module." 168 #define MODULE_PROPERTY_PREFIX_LEN 11 169 #define ADDEXPORTS "addexports" 170 #define ADDEXPORTS_LEN 10 171 #define ADDREADS "addreads" 172 #define ADDREADS_LEN 8 173 #define ADDOPENS "addopens" 174 #define ADDOPENS_LEN 8 175 #define PATCH "patch" 176 #define PATCH_LEN 5 177 #define ADDMODS "addmods" 178 #define ADDMODS_LEN 7 179 #define LIMITMODS "limitmods" 180 #define LIMITMODS_LEN 9 181 #define PATH "path" 182 #define PATH_LEN 4 183 #define UPGRADE_PATH "upgrade.path" 184 #define UPGRADE_PATH_LEN 12 185 186 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 187 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 188 return ((strncmp(option, property, len) == 0) && 189 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 190 } 191 192 // Return true if property starts with "jdk.module." and its ensuing chars match 193 // any of the reserved module properties. 194 // property should be passed without the leading "-D". 195 bool Arguments::is_internal_module_property(const char* property) { 196 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 197 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 198 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 199 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 200 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 201 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 202 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 203 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 204 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 205 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 206 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 207 return true; 208 } 209 } 210 return false; 211 } 212 213 // Process java launcher properties. 214 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 215 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 216 // sun.java.launcher.pid is defined. 217 // Must do this before setting up other system properties, 218 // as some of them may depend on launcher type. 219 for (int index = 0; index < args->nOptions; index++) { 220 const JavaVMOption* option = args->options + index; 221 const char* tail; 222 223 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 224 process_java_launcher_argument(tail, option->extraInfo); 225 continue; 226 } 227 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 228 if (strcmp(tail, "true") == 0) { 229 _sun_java_launcher_is_altjvm = true; 230 } 231 continue; 232 } 233 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 234 _sun_java_launcher_pid = atoi(tail); 235 continue; 236 } 237 } 238 } 239 240 // Initialize system properties key and value. 241 void Arguments::init_system_properties() { 242 243 // Set up _system_boot_class_path which is not a property but 244 // relies heavily on argument processing and the jdk.boot.class.path.append 245 // property. It is used to store the underlying system boot class path. 246 _system_boot_class_path = new PathString(NULL); 247 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 249 "Java Virtual Machine Specification", false)); 250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 253 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 254 255 // Following are JVMTI agent writable properties. 256 // Properties values are set to NULL and they are 257 // os specific they are initialized in os::init_system_properties_values(). 258 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 259 _java_library_path = new SystemProperty("java.library.path", NULL, true); 260 _java_home = new SystemProperty("java.home", NULL, true); 261 _java_class_path = new SystemProperty("java.class.path", "", true); 262 // jdk.boot.class.path.append is a non-writeable, internal property. 263 // It can only be set by either: 264 // - -Xbootclasspath/a: 265 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 266 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 267 268 // Add to System Property list. 269 PropertyList_add(&_system_properties, _sun_boot_library_path); 270 PropertyList_add(&_system_properties, _java_library_path); 271 PropertyList_add(&_system_properties, _java_home); 272 PropertyList_add(&_system_properties, _java_class_path); 273 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 274 275 // Set OS specific system properties values 276 os::init_system_properties_values(); 277 } 278 279 // Update/Initialize System properties after JDK version number is known 280 void Arguments::init_version_specific_system_properties() { 281 enum { bufsz = 16 }; 282 char buffer[bufsz]; 283 const char* spec_vendor = "Oracle Corporation"; 284 uint32_t spec_version = JDK_Version::current().major_version(); 285 286 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 287 288 PropertyList_add(&_system_properties, 289 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 290 PropertyList_add(&_system_properties, 291 new SystemProperty("java.vm.specification.version", buffer, false)); 292 PropertyList_add(&_system_properties, 293 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 294 } 295 296 /* 297 * -XX argument processing: 298 * 299 * -XX arguments are defined in several places, such as: 300 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 301 * -XX arguments are parsed in parse_argument(). 302 * -XX argument bounds checking is done in check_vm_args_consistency(). 303 * 304 * Over time -XX arguments may change. There are mechanisms to handle common cases: 305 * 306 * ALIASED: An option that is simply another name for another option. This is often 307 * part of the process of deprecating a flag, but not all aliases need 308 * to be deprecated. 309 * 310 * Create an alias for an option by adding the old and new option names to the 311 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 312 * 313 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 314 * support may be removed in the future. Both regular and aliased options may be 315 * deprecated. 316 * 317 * Add a deprecation warning for an option (or alias) by adding an entry in the 318 * "special_jvm_flags" table and setting the "deprecated_in" field. 319 * Often an option "deprecated" in one major release will 320 * be made "obsolete" in the next. In this case the entry should also have it's 321 * "obsolete_in" field set. 322 * 323 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 324 * on the command line. A warning is printed to let the user know that option might not 325 * be accepted in the future. 326 * 327 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 328 * table and setting the "obsolete_in" field. 329 * 330 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 331 * to the current JDK version. The system will flatly refuse to admit the existence of 332 * the flag. This allows a flag to die automatically over JDK releases. 333 * 334 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 335 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 336 * - Newly obsolete or expired deprecated options should have their global variable 337 * definitions removed (from globals.hpp, etc) and related implementations removed. 338 * 339 * Recommended approach for removing options: 340 * 341 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 342 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 343 * 344 * To remove internal options (e.g. diagnostic, experimental, develop options), use 345 * a 2-step model adding major release numbers to the obsolete and expire columns. 346 * 347 * To change the name of an option, use the alias table as well as a 2-step 348 * model adding major release numbers to the deprecate and expire columns. 349 * Think twice about aliasing commonly used customer options. 350 * 351 * There are times when it is appropriate to leave a future release number as undefined. 352 * 353 * Tests: Aliases should be tested in VMAliasOptions.java. 354 * Deprecated options should be tested in VMDeprecatedOptions.java. 355 */ 356 357 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 358 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 359 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 360 // the command-line as usual, but will issue a warning. 361 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 362 // the command-line, while issuing a warning and ignoring the flag value. 363 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 364 // existence of the flag. 365 // 366 // MANUAL CLEANUP ON JDK VERSION UPDATES: 367 // This table ensures that the handling of options will update automatically when the JDK 368 // version is incremented, but the source code needs to be cleanup up manually: 369 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 370 // variable should be removed, as well as users of the variable. 371 // - As "deprecated" options age into "obsolete" options, move the entry into the 372 // "Obsolete Flags" section of the table. 373 // - All expired options should be removed from the table. 374 static SpecialFlag const special_jvm_flags[] = { 375 // -------------- Deprecated Flags -------------- 376 // --- Non-alias flags - sorted by obsolete_in then expired_in: 377 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 378 379 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 380 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 381 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 382 383 // -------------- Obsolete Flags - sorted by expired_in -------------- 384 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 385 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 386 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 387 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 388 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 389 390 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 391 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 392 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 393 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 394 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 395 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 396 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 397 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 398 #endif 399 400 { NULL, JDK_Version(0), JDK_Version(0) } 401 }; 402 403 // Flags that are aliases for other flags. 404 typedef struct { 405 const char* alias_name; 406 const char* real_name; 407 } AliasedFlag; 408 409 static AliasedFlag const aliased_jvm_flags[] = { 410 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 411 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 412 { NULL, NULL} 413 }; 414 415 // NOTE: A compatibility request will be necessary for each alias to be removed. 416 static AliasedLoggingFlag const aliased_logging_flags[] = { 417 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 418 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 419 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 420 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 421 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 422 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 423 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 424 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 425 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 426 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 427 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 428 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 429 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 430 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 431 }; 432 433 #ifndef PRODUCT 434 // These options are removed in jdk9. Remove this code for jdk10. 435 static AliasedFlag const removed_develop_logging_flags[] = { 436 { "TraceClassInitialization", "-Xlog:class+init" }, 437 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 438 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 439 { "TraceItables", "-Xlog:itables=debug" }, 440 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 441 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 442 { "TraceStartupTime", "-Xlog:startuptime" }, 443 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 444 { "PrintVtables", "-Xlog:vtables=debug" }, 445 { "VerboseVerification", "-Xlog:verification" }, 446 { NULL, NULL } 447 }; 448 #endif //PRODUCT 449 450 // Return true if "v" is less than "other", where "other" may be "undefined". 451 static bool version_less_than(JDK_Version v, JDK_Version other) { 452 assert(!v.is_undefined(), "must be defined"); 453 if (!other.is_undefined() && v.compare(other) >= 0) { 454 return false; 455 } else { 456 return true; 457 } 458 } 459 460 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 461 462 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 463 // Allow extensions to have priority 464 if (lookup_special_flag_ext(flag_name, flag)) { 465 return true; 466 } 467 468 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 469 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 470 flag = special_jvm_flags[i]; 471 return true; 472 } 473 } 474 return false; 475 } 476 477 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 478 assert(version != NULL, "Must provide a version buffer"); 479 SpecialFlag flag; 480 if (lookup_special_flag(flag_name, flag)) { 481 if (!flag.obsolete_in.is_undefined()) { 482 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 483 *version = flag.obsolete_in; 484 return true; 485 } 486 } 487 } 488 return false; 489 } 490 491 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 492 assert(version != NULL, "Must provide a version buffer"); 493 SpecialFlag flag; 494 if (lookup_special_flag(flag_name, flag)) { 495 if (!flag.deprecated_in.is_undefined()) { 496 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 497 version_less_than(JDK_Version::current(), flag.expired_in)) { 498 *version = flag.deprecated_in; 499 return 1; 500 } else { 501 return -1; 502 } 503 } 504 } 505 return 0; 506 } 507 508 #ifndef PRODUCT 509 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 510 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 511 const AliasedFlag& flag = removed_develop_logging_flags[i]; 512 if (strcmp(flag.alias_name, name) == 0) { 513 return flag.real_name; 514 } 515 } 516 return NULL; 517 } 518 #endif // PRODUCT 519 520 const char* Arguments::real_flag_name(const char *flag_name) { 521 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 522 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 523 if (strcmp(flag_status.alias_name, flag_name) == 0) { 524 return flag_status.real_name; 525 } 526 } 527 return flag_name; 528 } 529 530 #ifdef ASSERT 531 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 532 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 533 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 534 return true; 535 } 536 } 537 return false; 538 } 539 540 static bool verify_special_jvm_flags() { 541 bool success = true; 542 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 543 const SpecialFlag& flag = special_jvm_flags[i]; 544 if (lookup_special_flag(flag.name, i)) { 545 warning("Duplicate special flag declaration \"%s\"", flag.name); 546 success = false; 547 } 548 if (flag.deprecated_in.is_undefined() && 549 flag.obsolete_in.is_undefined()) { 550 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 551 success = false; 552 } 553 554 if (!flag.deprecated_in.is_undefined()) { 555 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 556 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 557 success = false; 558 } 559 560 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 561 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 562 success = false; 563 } 564 } 565 566 if (!flag.obsolete_in.is_undefined()) { 567 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 568 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 569 success = false; 570 } 571 572 // if flag has become obsolete it should not have a "globals" flag defined anymore. 573 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 574 if (Flag::find_flag(flag.name) != NULL) { 575 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 576 success = false; 577 } 578 } 579 } 580 581 if (!flag.expired_in.is_undefined()) { 582 // if flag has become expired it should not have a "globals" flag defined anymore. 583 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 584 if (Flag::find_flag(flag.name) != NULL) { 585 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 586 success = false; 587 } 588 } 589 } 590 591 } 592 return success; 593 } 594 #endif 595 596 // Parses a size specification string. 597 bool Arguments::atojulong(const char *s, julong* result) { 598 julong n = 0; 599 600 // First char must be a digit. Don't allow negative numbers or leading spaces. 601 if (!isdigit(*s)) { 602 return false; 603 } 604 605 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 606 char* remainder; 607 errno = 0; 608 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 609 if (errno != 0) { 610 return false; 611 } 612 613 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 614 if (remainder == s || strlen(remainder) > 1) { 615 return false; 616 } 617 618 switch (*remainder) { 619 case 'T': case 't': 620 *result = n * G * K; 621 // Check for overflow. 622 if (*result/((julong)G * K) != n) return false; 623 return true; 624 case 'G': case 'g': 625 *result = n * G; 626 if (*result/G != n) return false; 627 return true; 628 case 'M': case 'm': 629 *result = n * M; 630 if (*result/M != n) return false; 631 return true; 632 case 'K': case 'k': 633 *result = n * K; 634 if (*result/K != n) return false; 635 return true; 636 case '\0': 637 *result = n; 638 return true; 639 default: 640 return false; 641 } 642 } 643 644 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 645 if (size < min_size) return arg_too_small; 646 // Check that size will fit in a size_t (only relevant on 32-bit) 647 if (size > max_uintx) return arg_too_big; 648 return arg_in_range; 649 } 650 651 // Describe an argument out of range error 652 void Arguments::describe_range_error(ArgsRange errcode) { 653 switch(errcode) { 654 case arg_too_big: 655 jio_fprintf(defaultStream::error_stream(), 656 "The specified size exceeds the maximum " 657 "representable size.\n"); 658 break; 659 case arg_too_small: 660 case arg_unreadable: 661 case arg_in_range: 662 // do nothing for now 663 break; 664 default: 665 ShouldNotReachHere(); 666 } 667 } 668 669 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 670 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 671 return true; 672 } else { 673 return false; 674 } 675 } 676 677 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 678 char* end; 679 errno = 0; 680 double v = strtod(value, &end); 681 if ((errno != 0) || (*end != 0)) { 682 return false; 683 } 684 685 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 686 return true; 687 } 688 return false; 689 } 690 691 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 692 julong v; 693 int int_v; 694 intx intx_v; 695 bool is_neg = false; 696 Flag* result = Flag::find_flag(name, strlen(name)); 697 698 if (result == NULL) { 699 return false; 700 } 701 702 // Check the sign first since atojulong() parses only unsigned values. 703 if (*value == '-') { 704 if (!result->is_intx() && !result->is_int()) { 705 return false; 706 } 707 value++; 708 is_neg = true; 709 } 710 if (!Arguments::atojulong(value, &v)) { 711 return false; 712 } 713 if (result->is_int()) { 714 int_v = (int) v; 715 if (is_neg) { 716 int_v = -int_v; 717 } 718 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 719 } else if (result->is_uint()) { 720 uint uint_v = (uint) v; 721 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 722 } else if (result->is_intx()) { 723 intx_v = (intx) v; 724 if (is_neg) { 725 intx_v = -intx_v; 726 } 727 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 728 } else if (result->is_uintx()) { 729 uintx uintx_v = (uintx) v; 730 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 731 } else if (result->is_uint64_t()) { 732 uint64_t uint64_t_v = (uint64_t) v; 733 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 734 } else if (result->is_size_t()) { 735 size_t size_t_v = (size_t) v; 736 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 737 } else if (result->is_double()) { 738 double double_v = (double) v; 739 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS; 740 } else { 741 return false; 742 } 743 } 744 745 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 746 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 747 // Contract: CommandLineFlags always returns a pointer that needs freeing. 748 FREE_C_HEAP_ARRAY(char, value); 749 return true; 750 } 751 752 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 753 const char* old_value = ""; 754 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 755 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 756 size_t new_len = strlen(new_value); 757 const char* value; 758 char* free_this_too = NULL; 759 if (old_len == 0) { 760 value = new_value; 761 } else if (new_len == 0) { 762 value = old_value; 763 } else { 764 size_t length = old_len + 1 + new_len + 1; 765 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 766 // each new setting adds another LINE to the switch: 767 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 768 value = buf; 769 free_this_too = buf; 770 } 771 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 772 // CommandLineFlags always returns a pointer that needs freeing. 773 FREE_C_HEAP_ARRAY(char, value); 774 if (free_this_too != NULL) { 775 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 776 FREE_C_HEAP_ARRAY(char, free_this_too); 777 } 778 return true; 779 } 780 781 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 782 const char* real_name = real_flag_name(arg); 783 JDK_Version since = JDK_Version(); 784 switch (is_deprecated_flag(arg, &since)) { 785 case -1: 786 return NULL; // obsolete or expired, don't process normally 787 case 0: 788 return real_name; 789 case 1: { 790 if (warn) { 791 char version[256]; 792 since.to_string(version, sizeof(version)); 793 if (real_name != arg) { 794 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 795 arg, version, real_name); 796 } else { 797 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 798 arg, version); 799 } 800 } 801 return real_name; 802 } 803 } 804 ShouldNotReachHere(); 805 return NULL; 806 } 807 808 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 809 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 810 // Set tagset string buffer at max size of 256, large enough for any alias tagset 811 const int max_tagset_size = 256; 812 int max_tagset_len = max_tagset_size - 1; 813 char tagset_buffer[max_tagset_size]; 814 tagset_buffer[0] = '\0'; 815 816 // Write tag-set for aliased logging option, in string list form 817 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 818 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 819 if (i > 0) { 820 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 821 } 822 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 823 } 824 if (!alf.exactMatch) { 825 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 826 } 827 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 828 (on) ? "+" : "-", 829 name, 830 tagset_buffer, 831 (on) ? LogLevel::name(alf.level) : "off"); 832 } 833 834 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 835 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 836 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 837 if (strcmp(alf.alias_name, name) == 0) { 838 log_deprecated_flag(name, on, alf); 839 return alf; 840 } 841 } 842 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 843 return a; 844 } 845 846 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 847 848 // range of acceptable characters spelled out for portability reasons 849 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 850 #define BUFLEN 255 851 char name[BUFLEN+1]; 852 char dummy; 853 const char* real_name; 854 bool warn_if_deprecated = true; 855 856 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 857 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 858 if (alf.alias_name != NULL){ 859 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 860 return true; 861 } 862 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 863 if (real_name == NULL) { 864 return false; 865 } 866 return set_bool_flag(real_name, false, origin); 867 } 868 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 869 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 870 if (alf.alias_name != NULL){ 871 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 872 return true; 873 } 874 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 875 if (real_name == NULL) { 876 return false; 877 } 878 return set_bool_flag(real_name, true, origin); 879 } 880 881 char punct; 882 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 883 const char* value = strchr(arg, '=') + 1; 884 Flag* flag; 885 886 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 887 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 888 if (alf.alias_name != NULL) { 889 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 890 return true; 891 } 892 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 893 if (real_name == NULL) { 894 return false; 895 } 896 flag = Flag::find_flag(real_name); 897 if (flag != NULL && flag->is_ccstr()) { 898 if (flag->ccstr_accumulates()) { 899 return append_to_string_flag(real_name, value, origin); 900 } else { 901 if (value[0] == '\0') { 902 value = NULL; 903 } 904 return set_string_flag(real_name, value, origin); 905 } 906 } else { 907 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 908 } 909 } 910 911 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 912 const char* value = strchr(arg, '=') + 1; 913 // -XX:Foo:=xxx will reset the string flag to the given value. 914 if (value[0] == '\0') { 915 value = NULL; 916 } 917 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 918 if (real_name == NULL) { 919 return false; 920 } 921 return set_string_flag(real_name, value, origin); 922 } 923 924 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 925 #define SIGNED_NUMBER_RANGE "[-0123456789]" 926 #define NUMBER_RANGE "[0123456789eE+-]" 927 char value[BUFLEN + 1]; 928 char value2[BUFLEN + 1]; 929 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 930 // Looks like a floating-point number -- try again with more lenient format string 931 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 932 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 933 if (real_name == NULL) { 934 return false; 935 } 936 return set_fp_numeric_flag(real_name, value, origin); 937 } 938 } 939 940 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 941 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 942 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 943 if (real_name == NULL) { 944 return false; 945 } 946 return set_numeric_flag(real_name, value, origin); 947 } 948 949 return false; 950 } 951 952 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 953 assert(bldarray != NULL, "illegal argument"); 954 955 if (arg == NULL) { 956 return; 957 } 958 959 int new_count = *count + 1; 960 961 // expand the array and add arg to the last element 962 if (*bldarray == NULL) { 963 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 964 } else { 965 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 966 } 967 (*bldarray)[*count] = os::strdup_check_oom(arg); 968 *count = new_count; 969 } 970 971 void Arguments::build_jvm_args(const char* arg) { 972 add_string(&_jvm_args_array, &_num_jvm_args, arg); 973 } 974 975 void Arguments::build_jvm_flags(const char* arg) { 976 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 977 } 978 979 // utility function to return a string that concatenates all 980 // strings in a given char** array 981 const char* Arguments::build_resource_string(char** args, int count) { 982 if (args == NULL || count == 0) { 983 return NULL; 984 } 985 size_t length = 0; 986 for (int i = 0; i < count; i++) { 987 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 988 } 989 char* s = NEW_RESOURCE_ARRAY(char, length); 990 char* dst = s; 991 for (int j = 0; j < count; j++) { 992 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 993 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 994 dst += offset; 995 length -= offset; 996 } 997 return (const char*) s; 998 } 999 1000 void Arguments::print_on(outputStream* st) { 1001 st->print_cr("VM Arguments:"); 1002 if (num_jvm_flags() > 0) { 1003 st->print("jvm_flags: "); print_jvm_flags_on(st); 1004 st->cr(); 1005 } 1006 if (num_jvm_args() > 0) { 1007 st->print("jvm_args: "); print_jvm_args_on(st); 1008 st->cr(); 1009 } 1010 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1011 if (_java_class_path != NULL) { 1012 char* path = _java_class_path->value(); 1013 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1014 } 1015 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1016 } 1017 1018 void Arguments::print_summary_on(outputStream* st) { 1019 // Print the command line. Environment variables that are helpful for 1020 // reproducing the problem are written later in the hs_err file. 1021 // flags are from setting file 1022 if (num_jvm_flags() > 0) { 1023 st->print_raw("Settings File: "); 1024 print_jvm_flags_on(st); 1025 st->cr(); 1026 } 1027 // args are the command line and environment variable arguments. 1028 st->print_raw("Command Line: "); 1029 if (num_jvm_args() > 0) { 1030 print_jvm_args_on(st); 1031 } 1032 // this is the classfile and any arguments to the java program 1033 if (java_command() != NULL) { 1034 st->print("%s", java_command()); 1035 } 1036 st->cr(); 1037 } 1038 1039 void Arguments::print_jvm_flags_on(outputStream* st) { 1040 if (_num_jvm_flags > 0) { 1041 for (int i=0; i < _num_jvm_flags; i++) { 1042 st->print("%s ", _jvm_flags_array[i]); 1043 } 1044 } 1045 } 1046 1047 void Arguments::print_jvm_args_on(outputStream* st) { 1048 if (_num_jvm_args > 0) { 1049 for (int i=0; i < _num_jvm_args; i++) { 1050 st->print("%s ", _jvm_args_array[i]); 1051 } 1052 } 1053 } 1054 1055 bool Arguments::process_argument(const char* arg, 1056 jboolean ignore_unrecognized, 1057 Flag::Flags origin) { 1058 JDK_Version since = JDK_Version(); 1059 1060 if (parse_argument(arg, origin)) { 1061 return true; 1062 } 1063 1064 // Determine if the flag has '+', '-', or '=' characters. 1065 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1066 const char* const argname = has_plus_minus ? arg + 1 : arg; 1067 1068 size_t arg_len; 1069 const char* equal_sign = strchr(argname, '='); 1070 if (equal_sign == NULL) { 1071 arg_len = strlen(argname); 1072 } else { 1073 arg_len = equal_sign - argname; 1074 } 1075 1076 // Only make the obsolete check for valid arguments. 1077 if (arg_len <= BUFLEN) { 1078 // Construct a string which consists only of the argument name without '+', '-', or '='. 1079 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1080 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1081 if (is_obsolete_flag(stripped_argname, &since)) { 1082 char version[256]; 1083 since.to_string(version, sizeof(version)); 1084 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1085 return true; 1086 } 1087 #ifndef PRODUCT 1088 else { 1089 const char* replacement; 1090 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1091 log_warning(arguments)("%s has been removed. Please use %s instead.", 1092 stripped_argname, 1093 replacement); 1094 return false; 1095 } 1096 } 1097 #endif //PRODUCT 1098 } 1099 1100 // For locked flags, report a custom error message if available. 1101 // Otherwise, report the standard unrecognized VM option. 1102 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1103 if (found_flag != NULL) { 1104 char locked_message_buf[BUFLEN]; 1105 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1106 if (strlen(locked_message_buf) == 0) { 1107 if (found_flag->is_bool() && !has_plus_minus) { 1108 jio_fprintf(defaultStream::error_stream(), 1109 "Missing +/- setting for VM option '%s'\n", argname); 1110 } else if (!found_flag->is_bool() && has_plus_minus) { 1111 jio_fprintf(defaultStream::error_stream(), 1112 "Unexpected +/- setting in VM option '%s'\n", argname); 1113 } else { 1114 jio_fprintf(defaultStream::error_stream(), 1115 "Improperly specified VM option '%s'\n", argname); 1116 } 1117 } else { 1118 #ifdef PRODUCT 1119 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1120 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1121 if (ignore_unrecognized && mismatched) { 1122 return true; 1123 } 1124 #endif 1125 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1126 } 1127 } else { 1128 if (ignore_unrecognized) { 1129 return true; 1130 } 1131 jio_fprintf(defaultStream::error_stream(), 1132 "Unrecognized VM option '%s'\n", argname); 1133 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1134 if (fuzzy_matched != NULL) { 1135 jio_fprintf(defaultStream::error_stream(), 1136 "Did you mean '%s%s%s'? ", 1137 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1138 fuzzy_matched->_name, 1139 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1140 } 1141 } 1142 1143 // allow for commandline "commenting out" options like -XX:#+Verbose 1144 return arg[0] == '#'; 1145 } 1146 1147 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1148 FILE* stream = fopen(file_name, "rb"); 1149 if (stream == NULL) { 1150 if (should_exist) { 1151 jio_fprintf(defaultStream::error_stream(), 1152 "Could not open settings file %s\n", file_name); 1153 return false; 1154 } else { 1155 return true; 1156 } 1157 } 1158 1159 char token[1024]; 1160 int pos = 0; 1161 1162 bool in_white_space = true; 1163 bool in_comment = false; 1164 bool in_quote = false; 1165 char quote_c = 0; 1166 bool result = true; 1167 1168 int c = getc(stream); 1169 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1170 if (in_white_space) { 1171 if (in_comment) { 1172 if (c == '\n') in_comment = false; 1173 } else { 1174 if (c == '#') in_comment = true; 1175 else if (!isspace(c)) { 1176 in_white_space = false; 1177 token[pos++] = c; 1178 } 1179 } 1180 } else { 1181 if (c == '\n' || (!in_quote && isspace(c))) { 1182 // token ends at newline, or at unquoted whitespace 1183 // this allows a way to include spaces in string-valued options 1184 token[pos] = '\0'; 1185 logOption(token); 1186 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1187 build_jvm_flags(token); 1188 pos = 0; 1189 in_white_space = true; 1190 in_quote = false; 1191 } else if (!in_quote && (c == '\'' || c == '"')) { 1192 in_quote = true; 1193 quote_c = c; 1194 } else if (in_quote && (c == quote_c)) { 1195 in_quote = false; 1196 } else { 1197 token[pos++] = c; 1198 } 1199 } 1200 c = getc(stream); 1201 } 1202 if (pos > 0) { 1203 token[pos] = '\0'; 1204 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1205 build_jvm_flags(token); 1206 } 1207 fclose(stream); 1208 return result; 1209 } 1210 1211 //============================================================================================================= 1212 // Parsing of properties (-D) 1213 1214 const char* Arguments::get_property(const char* key) { 1215 return PropertyList_get_value(system_properties(), key); 1216 } 1217 1218 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1219 const char* eq = strchr(prop, '='); 1220 const char* key; 1221 const char* value = ""; 1222 1223 if (eq == NULL) { 1224 // property doesn't have a value, thus use passed string 1225 key = prop; 1226 } else { 1227 // property have a value, thus extract it and save to the 1228 // allocated string 1229 size_t key_len = eq - prop; 1230 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1231 1232 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1233 key = tmp_key; 1234 1235 value = &prop[key_len + 1]; 1236 } 1237 1238 if (strcmp(key, "java.compiler") == 0) { 1239 process_java_compiler_argument(value); 1240 // Record value in Arguments, but let it get passed to Java. 1241 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1242 strcmp(key, "sun.java.launcher.pid") == 0) { 1243 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1244 // private and are processed in process_sun_java_launcher_properties(); 1245 // the sun.java.launcher property is passed on to the java application 1246 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1247 // append is true, writable is true, internal is false 1248 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1249 WriteableProperty, ExternalProperty); 1250 } else { 1251 if (strcmp(key, "sun.java.command") == 0) { 1252 char *old_java_command = _java_command; 1253 _java_command = os::strdup_check_oom(value, mtArguments); 1254 if (old_java_command != NULL) { 1255 os::free(old_java_command); 1256 } 1257 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1258 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1259 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1260 // its value without going through the property list or making a Java call. 1261 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1262 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1263 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1264 os::free((void *)old_java_vendor_url_bug); 1265 } 1266 } 1267 1268 // Create new property and add at the end of the list 1269 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1270 } 1271 1272 if (key != prop) { 1273 // SystemProperty copy passed value, thus free previously allocated 1274 // memory 1275 FreeHeap((void *)key); 1276 } 1277 1278 return true; 1279 } 1280 1281 #if INCLUDE_CDS 1282 void Arguments::check_unsupported_dumping_properties() { 1283 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1284 const char* unsupported_properties[] = { "jdk.module.main", 1285 "jdk.module.limitmods", 1286 "jdk.module.path", 1287 "jdk.module.upgrade.path", 1288 "jdk.module.addmods.0", 1289 "jdk.module.patch.0" }; 1290 const char* unsupported_options[] = { "-m", // cannot use at dump time 1291 "--limit-modules", // ignored at dump time 1292 "--module-path", // ignored at dump time 1293 "--upgrade-module-path", // ignored at dump time 1294 "--add-modules", // ignored at dump time 1295 "--patch-module" // ignored at dump time 1296 }; 1297 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1298 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1299 // vm will exit with an error message. Otherwise, it will print an informational message if 1300 // PrintSharedSpaces is enabled. 1301 uint info_idx = 1; 1302 SystemProperty* sp = system_properties(); 1303 while (sp != NULL) { 1304 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1305 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1306 if (i < info_idx) { 1307 vm_exit_during_initialization( 1308 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1309 } else { 1310 if (PrintSharedSpaces) { 1311 tty->print_cr( 1312 "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]); 1313 } 1314 } 1315 } 1316 } 1317 sp = sp->next(); 1318 } 1319 1320 // Check for an exploded module build in use with -Xshare:dump. 1321 if (!has_jimage()) { 1322 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1323 } 1324 } 1325 #endif 1326 1327 //=========================================================================================================== 1328 // Setting int/mixed/comp mode flags 1329 1330 void Arguments::set_mode_flags(Mode mode) { 1331 // Set up default values for all flags. 1332 // If you add a flag to any of the branches below, 1333 // add a default value for it here. 1334 set_java_compiler(false); 1335 _mode = mode; 1336 1337 // Ensure Agent_OnLoad has the correct initial values. 1338 // This may not be the final mode; mode may change later in onload phase. 1339 PropertyList_unique_add(&_system_properties, "java.vm.info", 1340 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1341 1342 UseInterpreter = true; 1343 UseCompiler = true; 1344 UseLoopCounter = true; 1345 1346 // Default values may be platform/compiler dependent - 1347 // use the saved values 1348 ClipInlining = Arguments::_ClipInlining; 1349 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1350 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1351 BackgroundCompilation = Arguments::_BackgroundCompilation; 1352 if (TieredCompilation) { 1353 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1354 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1355 } 1356 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1357 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1358 } 1359 } 1360 1361 // Change from defaults based on mode 1362 switch (mode) { 1363 default: 1364 ShouldNotReachHere(); 1365 break; 1366 case _int: 1367 UseCompiler = false; 1368 UseLoopCounter = false; 1369 AlwaysCompileLoopMethods = false; 1370 UseOnStackReplacement = false; 1371 break; 1372 case _mixed: 1373 // same as default 1374 break; 1375 case _comp: 1376 UseInterpreter = false; 1377 BackgroundCompilation = false; 1378 ClipInlining = false; 1379 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1380 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1381 // compile a level 4 (C2) and then continue executing it. 1382 if (TieredCompilation) { 1383 Tier3InvokeNotifyFreqLog = 0; 1384 Tier4InvocationThreshold = 0; 1385 } 1386 break; 1387 } 1388 } 1389 1390 // Conflict: required to use shared spaces (-Xshare:on), but 1391 // incompatible command line options were chosen. 1392 static void no_shared_spaces(const char* message) { 1393 if (RequireSharedSpaces) { 1394 jio_fprintf(defaultStream::error_stream(), 1395 "Class data sharing is inconsistent with other specified options.\n"); 1396 vm_exit_during_initialization("Unable to use shared archive.", message); 1397 } else { 1398 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1399 } 1400 } 1401 1402 // Returns threshold scaled with the value of scale. 1403 // If scale < 0.0, threshold is returned without scaling. 1404 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1405 if (scale == 1.0 || scale < 0.0) { 1406 return threshold; 1407 } else { 1408 return (intx)(threshold * scale); 1409 } 1410 } 1411 1412 // Returns freq_log scaled with the value of scale. 1413 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1414 // If scale < 0.0, freq_log is returned without scaling. 1415 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1416 // Check if scaling is necessary or if negative value was specified. 1417 if (scale == 1.0 || scale < 0.0) { 1418 return freq_log; 1419 } 1420 // Check values to avoid calculating log2 of 0. 1421 if (scale == 0.0 || freq_log == 0) { 1422 return 0; 1423 } 1424 // Determine the maximum notification frequency value currently supported. 1425 // The largest mask value that the interpreter/C1 can handle is 1426 // of length InvocationCounter::number_of_count_bits. Mask values are always 1427 // one bit shorter then the value of the notification frequency. Set 1428 // max_freq_bits accordingly. 1429 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1430 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1431 if (scaled_freq == 0) { 1432 // Return 0 right away to avoid calculating log2 of 0. 1433 return 0; 1434 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1435 return max_freq_bits; 1436 } else { 1437 return log2_intptr(scaled_freq); 1438 } 1439 } 1440 1441 void Arguments::set_tiered_flags() { 1442 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1443 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1444 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1445 } 1446 if (CompilationPolicyChoice < 2) { 1447 vm_exit_during_initialization( 1448 "Incompatible compilation policy selected", NULL); 1449 } 1450 // Increase the code cache size - tiered compiles a lot more. 1451 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1452 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1453 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1454 } 1455 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1456 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1457 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1458 } 1459 if (!UseInterpreter) { // -Xcomp 1460 Tier3InvokeNotifyFreqLog = 0; 1461 Tier4InvocationThreshold = 0; 1462 } 1463 1464 if (CompileThresholdScaling < 0) { 1465 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1466 } 1467 1468 // Scale tiered compilation thresholds. 1469 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1470 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1471 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1472 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1473 1474 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1475 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1476 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1477 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1478 1479 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1480 // once these thresholds become supported. 1481 1482 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1483 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1484 1485 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1486 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1487 1488 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1489 1490 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1491 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1492 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1493 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1494 } 1495 } 1496 1497 #if INCLUDE_ALL_GCS 1498 static void disable_adaptive_size_policy(const char* collector_name) { 1499 if (UseAdaptiveSizePolicy) { 1500 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1501 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1502 collector_name); 1503 } 1504 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1505 } 1506 } 1507 1508 void Arguments::set_parnew_gc_flags() { 1509 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1510 "control point invariant"); 1511 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1512 1513 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1514 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1515 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1516 } else if (ParallelGCThreads == 0) { 1517 jio_fprintf(defaultStream::error_stream(), 1518 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1519 vm_exit(1); 1520 } 1521 1522 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1523 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1524 // we set them to 1024 and 1024. 1525 // See CR 6362902. 1526 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1527 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1528 } 1529 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1530 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1531 } 1532 1533 // When using compressed oops, we use local overflow stacks, 1534 // rather than using a global overflow list chained through 1535 // the klass word of the object's pre-image. 1536 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1537 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1538 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1539 } 1540 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1541 } 1542 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1543 } 1544 1545 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1546 // sparc/solaris for certain applications, but would gain from 1547 // further optimization and tuning efforts, and would almost 1548 // certainly gain from analysis of platform and environment. 1549 void Arguments::set_cms_and_parnew_gc_flags() { 1550 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1551 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1552 1553 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1554 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1555 1556 set_parnew_gc_flags(); 1557 1558 size_t max_heap = align_size_down(MaxHeapSize, 1559 CardTableRS::ct_max_alignment_constraint()); 1560 1561 // Now make adjustments for CMS 1562 intx tenuring_default = (intx)6; 1563 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1564 1565 // Preferred young gen size for "short" pauses: 1566 // upper bound depends on # of threads and NewRatio. 1567 const size_t preferred_max_new_size_unaligned = 1568 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1569 size_t preferred_max_new_size = 1570 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1571 1572 // Unless explicitly requested otherwise, size young gen 1573 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1574 1575 // If either MaxNewSize or NewRatio is set on the command line, 1576 // assume the user is trying to set the size of the young gen. 1577 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1578 1579 // Set MaxNewSize to our calculated preferred_max_new_size unless 1580 // NewSize was set on the command line and it is larger than 1581 // preferred_max_new_size. 1582 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1583 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1584 } else { 1585 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1586 } 1587 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1588 1589 // Code along this path potentially sets NewSize and OldSize 1590 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1591 min_heap_size(), InitialHeapSize, max_heap); 1592 size_t min_new = preferred_max_new_size; 1593 if (FLAG_IS_CMDLINE(NewSize)) { 1594 min_new = NewSize; 1595 } 1596 if (max_heap > min_new && min_heap_size() > min_new) { 1597 // Unless explicitly requested otherwise, make young gen 1598 // at least min_new, and at most preferred_max_new_size. 1599 if (FLAG_IS_DEFAULT(NewSize)) { 1600 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1601 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1602 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1603 } 1604 // Unless explicitly requested otherwise, size old gen 1605 // so it's NewRatio x of NewSize. 1606 if (FLAG_IS_DEFAULT(OldSize)) { 1607 if (max_heap > NewSize) { 1608 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1609 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1610 } 1611 } 1612 } 1613 } 1614 // Unless explicitly requested otherwise, definitely 1615 // promote all objects surviving "tenuring_default" scavenges. 1616 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1617 FLAG_IS_DEFAULT(SurvivorRatio)) { 1618 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1619 } 1620 // If we decided above (or user explicitly requested) 1621 // `promote all' (via MaxTenuringThreshold := 0), 1622 // prefer minuscule survivor spaces so as not to waste 1623 // space for (non-existent) survivors 1624 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1625 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1626 } 1627 1628 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1629 // but rather the number of free blocks of a given size that are used when 1630 // replenishing the local per-worker free list caches. 1631 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1632 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1633 // OldPLAB sizing manually turned off: Use a larger default setting, 1634 // unless it was manually specified. This is because a too-low value 1635 // will slow down scavenges. 1636 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1637 } else { 1638 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1639 } 1640 } 1641 1642 // If either of the static initialization defaults have changed, note this 1643 // modification. 1644 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1645 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1646 } 1647 1648 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1649 } 1650 #endif // INCLUDE_ALL_GCS 1651 1652 void set_object_alignment() { 1653 // Object alignment. 1654 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1655 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1656 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1657 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1658 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1659 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1660 1661 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1662 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1663 1664 // Oop encoding heap max 1665 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1666 1667 if (SurvivorAlignmentInBytes == 0) { 1668 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1669 } 1670 1671 #if INCLUDE_ALL_GCS 1672 // Set CMS global values 1673 CompactibleFreeListSpace::set_cms_values(); 1674 #endif // INCLUDE_ALL_GCS 1675 } 1676 1677 size_t Arguments::max_heap_for_compressed_oops() { 1678 // Avoid sign flip. 1679 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1680 // We need to fit both the NULL page and the heap into the memory budget, while 1681 // keeping alignment constraints of the heap. To guarantee the latter, as the 1682 // NULL page is located before the heap, we pad the NULL page to the conservative 1683 // maximum alignment that the GC may ever impose upon the heap. 1684 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1685 _conservative_max_heap_alignment); 1686 1687 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1688 NOT_LP64(ShouldNotReachHere(); return 0); 1689 } 1690 1691 void Arguments::set_use_compressed_oops() { 1692 #ifndef ZERO 1693 #ifdef _LP64 1694 // MaxHeapSize is not set up properly at this point, but 1695 // the only value that can override MaxHeapSize if we are 1696 // to use UseCompressedOops is InitialHeapSize. 1697 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1698 1699 if (max_heap_size <= max_heap_for_compressed_oops()) { 1700 #if !defined(COMPILER1) || defined(TIERED) 1701 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1702 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1703 } 1704 #endif 1705 } else { 1706 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1707 warning("Max heap size too large for Compressed Oops"); 1708 FLAG_SET_DEFAULT(UseCompressedOops, false); 1709 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1710 } 1711 } 1712 #endif // _LP64 1713 #endif // ZERO 1714 } 1715 1716 1717 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1718 // set_use_compressed_oops(). 1719 void Arguments::set_use_compressed_klass_ptrs() { 1720 #ifndef ZERO 1721 #ifdef _LP64 1722 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1723 if (!UseCompressedOops) { 1724 if (UseCompressedClassPointers) { 1725 warning("UseCompressedClassPointers requires UseCompressedOops"); 1726 } 1727 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1728 } else { 1729 // Turn on UseCompressedClassPointers too 1730 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1731 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1732 } 1733 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1734 if (UseCompressedClassPointers) { 1735 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1736 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1737 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1738 } 1739 } 1740 } 1741 #endif // _LP64 1742 #endif // !ZERO 1743 } 1744 1745 void Arguments::set_conservative_max_heap_alignment() { 1746 // The conservative maximum required alignment for the heap is the maximum of 1747 // the alignments imposed by several sources: any requirements from the heap 1748 // itself, the collector policy and the maximum page size we may run the VM 1749 // with. 1750 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1751 #if INCLUDE_ALL_GCS 1752 if (UseParallelGC) { 1753 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1754 } else if (UseG1GC) { 1755 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1756 } 1757 #endif // INCLUDE_ALL_GCS 1758 _conservative_max_heap_alignment = MAX4(heap_alignment, 1759 (size_t)os::vm_allocation_granularity(), 1760 os::max_page_size(), 1761 CollectorPolicy::compute_heap_alignment()); 1762 } 1763 1764 bool Arguments::gc_selected() { 1765 #if INCLUDE_ALL_GCS 1766 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1767 #else 1768 return UseSerialGC; 1769 #endif // INCLUDE_ALL_GCS 1770 } 1771 1772 #ifdef TIERED 1773 bool Arguments::compilation_mode_selected() { 1774 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1775 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1776 1777 } 1778 1779 void Arguments::select_compilation_mode_ergonomically() { 1780 #if defined(_WINDOWS) && !defined(_LP64) 1781 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1782 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1783 } 1784 #endif 1785 if (NeverActAsServerClassMachine) { 1786 set_client_compilation_mode(); 1787 } 1788 } 1789 #endif //TIERED 1790 1791 void Arguments::select_gc_ergonomically() { 1792 #if INCLUDE_ALL_GCS 1793 if (os::is_server_class_machine()) { 1794 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1795 } else { 1796 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1797 } 1798 #else 1799 UNSUPPORTED_OPTION(UseG1GC); 1800 UNSUPPORTED_OPTION(UseParallelGC); 1801 UNSUPPORTED_OPTION(UseParallelOldGC); 1802 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1803 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1804 #endif // INCLUDE_ALL_GCS 1805 } 1806 1807 void Arguments::select_gc() { 1808 if (!gc_selected()) { 1809 select_gc_ergonomically(); 1810 if (!gc_selected()) { 1811 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1812 } 1813 } 1814 } 1815 1816 #if INCLUDE_JVMCI 1817 void Arguments::set_jvmci_specific_flags() { 1818 if (UseJVMCICompiler) { 1819 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1820 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1821 } 1822 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1823 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1824 } 1825 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1826 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1827 } 1828 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1829 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1830 } 1831 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1832 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1833 } 1834 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1835 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1836 } 1837 if (TieredStopAtLevel != CompLevel_full_optimization) { 1838 // Currently JVMCI compiler can only work at the full optimization level 1839 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1840 TieredStopAtLevel = CompLevel_full_optimization; 1841 } 1842 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1843 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1844 } 1845 } 1846 } 1847 #endif 1848 1849 void Arguments::set_ergonomics_flags() { 1850 #ifdef TIERED 1851 if (!compilation_mode_selected()) { 1852 select_compilation_mode_ergonomically(); 1853 } 1854 #endif 1855 select_gc(); 1856 1857 #if defined(COMPILER2) || INCLUDE_JVMCI 1858 // Shared spaces work fine with other GCs but causes bytecode rewriting 1859 // to be disabled, which hurts interpreter performance and decreases 1860 // server performance. When -server is specified, keep the default off 1861 // unless it is asked for. Future work: either add bytecode rewriting 1862 // at link time, or rewrite bytecodes in non-shared methods. 1863 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1864 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1865 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1866 } 1867 #endif 1868 1869 set_conservative_max_heap_alignment(); 1870 1871 #ifndef ZERO 1872 #ifdef _LP64 1873 set_use_compressed_oops(); 1874 1875 // set_use_compressed_klass_ptrs() must be called after calling 1876 // set_use_compressed_oops(). 1877 set_use_compressed_klass_ptrs(); 1878 1879 // Also checks that certain machines are slower with compressed oops 1880 // in vm_version initialization code. 1881 #endif // _LP64 1882 #endif // !ZERO 1883 1884 } 1885 1886 void Arguments::set_parallel_gc_flags() { 1887 assert(UseParallelGC || UseParallelOldGC, "Error"); 1888 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1889 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1890 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1891 } 1892 FLAG_SET_DEFAULT(UseParallelGC, true); 1893 1894 // If no heap maximum was requested explicitly, use some reasonable fraction 1895 // of the physical memory, up to a maximum of 1GB. 1896 FLAG_SET_DEFAULT(ParallelGCThreads, 1897 Abstract_VM_Version::parallel_worker_threads()); 1898 if (ParallelGCThreads == 0) { 1899 jio_fprintf(defaultStream::error_stream(), 1900 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1901 vm_exit(1); 1902 } 1903 1904 if (UseAdaptiveSizePolicy) { 1905 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1906 // unless the user actually sets these flags. 1907 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1908 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1909 } 1910 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1911 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1912 } 1913 } 1914 1915 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1916 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1917 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1918 // See CR 6362902 for details. 1919 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1920 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1921 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1922 } 1923 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1924 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1925 } 1926 } 1927 1928 if (UseParallelOldGC) { 1929 // Par compact uses lower default values since they are treated as 1930 // minimums. These are different defaults because of the different 1931 // interpretation and are not ergonomically set. 1932 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1933 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1934 } 1935 } 1936 } 1937 1938 void Arguments::set_g1_gc_flags() { 1939 assert(UseG1GC, "Error"); 1940 #if defined(COMPILER1) || INCLUDE_JVMCI 1941 FastTLABRefill = false; 1942 #endif 1943 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1944 if (ParallelGCThreads == 0) { 1945 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1946 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1947 } 1948 1949 #if INCLUDE_ALL_GCS 1950 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1951 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1952 } 1953 #endif 1954 1955 // MarkStackSize will be set (if it hasn't been set by the user) 1956 // when concurrent marking is initialized. 1957 // Its value will be based upon the number of parallel marking threads. 1958 // But we do set the maximum mark stack size here. 1959 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1960 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1961 } 1962 1963 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1964 // In G1, we want the default GC overhead goal to be higher than 1965 // it is for PS, or the heap might be expanded too aggressively. 1966 // We set it here to ~8%. 1967 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1968 } 1969 1970 // Below, we might need to calculate the pause time interval based on 1971 // the pause target. When we do so we are going to give G1 maximum 1972 // flexibility and allow it to do pauses when it needs to. So, we'll 1973 // arrange that the pause interval to be pause time target + 1 to 1974 // ensure that a) the pause time target is maximized with respect to 1975 // the pause interval and b) we maintain the invariant that pause 1976 // time target < pause interval. If the user does not want this 1977 // maximum flexibility, they will have to set the pause interval 1978 // explicitly. 1979 1980 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1981 // The default pause time target in G1 is 200ms 1982 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1983 } 1984 1985 // Then, if the interval parameter was not set, set it according to 1986 // the pause time target (this will also deal with the case when the 1987 // pause time target is the default value). 1988 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1989 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1990 } 1991 1992 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1993 } 1994 1995 void Arguments::set_gc_specific_flags() { 1996 #if INCLUDE_ALL_GCS 1997 // Set per-collector flags 1998 if (UseParallelGC || UseParallelOldGC) { 1999 set_parallel_gc_flags(); 2000 } else if (UseConcMarkSweepGC) { 2001 set_cms_and_parnew_gc_flags(); 2002 } else if (UseG1GC) { 2003 set_g1_gc_flags(); 2004 } 2005 if (AssumeMP && !UseSerialGC) { 2006 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2007 warning("If the number of processors is expected to increase from one, then" 2008 " you should configure the number of parallel GC threads appropriately" 2009 " using -XX:ParallelGCThreads=N"); 2010 } 2011 } 2012 if (MinHeapFreeRatio == 100) { 2013 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2014 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2015 } 2016 2017 // If class unloading is disabled, also disable concurrent class unloading. 2018 if (!ClassUnloading) { 2019 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2020 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2021 } 2022 #endif // INCLUDE_ALL_GCS 2023 } 2024 2025 julong Arguments::limit_by_allocatable_memory(julong limit) { 2026 julong max_allocatable; 2027 julong result = limit; 2028 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2029 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2030 } 2031 return result; 2032 } 2033 2034 // Use static initialization to get the default before parsing 2035 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2036 2037 void Arguments::set_heap_size() { 2038 julong phys_mem = 2039 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2040 : (julong)MaxRAM; 2041 2042 // Experimental support for CGroup memory limits 2043 if (UseCGroupMemoryLimitForHeap) { 2044 // This is a rough indicator that a CGroup limit may be in force 2045 // for this process 2046 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 2047 FILE *fp = fopen(lim_file, "r"); 2048 if (fp != NULL) { 2049 julong cgroup_max = 0; 2050 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2051 if (ret == 1 && cgroup_max > 0) { 2052 // If unlimited, cgroup_max will be a very large, but unspecified 2053 // value, so use initial phys_mem as a limit 2054 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2055 JULONG_FORMAT "MB) and initial phys_mem (" 2056 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2057 phys_mem = MIN2(cgroup_max, phys_mem); 2058 } else { 2059 warning("Unable to read/parse cgroup memory limit from %s: %s", 2060 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2061 } 2062 fclose(fp); 2063 } else { 2064 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2065 } 2066 } 2067 2068 // If the maximum heap size has not been set with -Xmx, 2069 // then set it as fraction of the size of physical memory, 2070 // respecting the maximum and minimum sizes of the heap. 2071 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2072 julong reasonable_max = phys_mem / MaxRAMFraction; 2073 2074 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2075 // Small physical memory, so use a minimum fraction of it for the heap 2076 reasonable_max = phys_mem / MinRAMFraction; 2077 } else { 2078 // Not-small physical memory, so require a heap at least 2079 // as large as MaxHeapSize 2080 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2081 } 2082 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2083 // Limit the heap size to ErgoHeapSizeLimit 2084 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2085 } 2086 if (UseCompressedOops) { 2087 // Limit the heap size to the maximum possible when using compressed oops 2088 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2089 2090 // HeapBaseMinAddress can be greater than default but not less than. 2091 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2092 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2093 // matches compressed oops printing flags 2094 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2095 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2096 DefaultHeapBaseMinAddress, 2097 DefaultHeapBaseMinAddress/G, 2098 HeapBaseMinAddress); 2099 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2100 } 2101 } 2102 2103 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2104 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2105 // but it should be not less than default MaxHeapSize. 2106 max_coop_heap -= HeapBaseMinAddress; 2107 } 2108 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2109 } 2110 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2111 2112 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2113 // An initial heap size was specified on the command line, 2114 // so be sure that the maximum size is consistent. Done 2115 // after call to limit_by_allocatable_memory because that 2116 // method might reduce the allocation size. 2117 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2118 } 2119 2120 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2121 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2122 } 2123 2124 // If the minimum or initial heap_size have not been set or requested to be set 2125 // ergonomically, set them accordingly. 2126 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2127 julong reasonable_minimum = (julong)(OldSize + NewSize); 2128 2129 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2130 2131 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2132 2133 if (InitialHeapSize == 0) { 2134 julong reasonable_initial = phys_mem / InitialRAMFraction; 2135 2136 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2137 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2138 2139 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2140 2141 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2142 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2143 } 2144 // If the minimum heap size has not been set (via -Xms), 2145 // synchronize with InitialHeapSize to avoid errors with the default value. 2146 if (min_heap_size() == 0) { 2147 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2148 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2149 } 2150 } 2151 } 2152 2153 // This option inspects the machine and attempts to set various 2154 // parameters to be optimal for long-running, memory allocation 2155 // intensive jobs. It is intended for machines with large 2156 // amounts of cpu and memory. 2157 jint Arguments::set_aggressive_heap_flags() { 2158 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2159 // VM, but we may not be able to represent the total physical memory 2160 // available (like having 8gb of memory on a box but using a 32bit VM). 2161 // Thus, we need to make sure we're using a julong for intermediate 2162 // calculations. 2163 julong initHeapSize; 2164 julong total_memory = os::physical_memory(); 2165 2166 if (total_memory < (julong) 256 * M) { 2167 jio_fprintf(defaultStream::error_stream(), 2168 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2169 vm_exit(1); 2170 } 2171 2172 // The heap size is half of available memory, or (at most) 2173 // all of possible memory less 160mb (leaving room for the OS 2174 // when using ISM). This is the maximum; because adaptive sizing 2175 // is turned on below, the actual space used may be smaller. 2176 2177 initHeapSize = MIN2(total_memory / (julong) 2, 2178 total_memory - (julong) 160 * M); 2179 2180 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2181 2182 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2183 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2184 return JNI_EINVAL; 2185 } 2186 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2187 return JNI_EINVAL; 2188 } 2189 // Currently the minimum size and the initial heap sizes are the same. 2190 set_min_heap_size(initHeapSize); 2191 } 2192 if (FLAG_IS_DEFAULT(NewSize)) { 2193 // Make the young generation 3/8ths of the total heap. 2194 if (FLAG_SET_CMDLINE(size_t, NewSize, 2195 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2196 return JNI_EINVAL; 2197 } 2198 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2199 return JNI_EINVAL; 2200 } 2201 } 2202 2203 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2204 FLAG_SET_DEFAULT(UseLargePages, true); 2205 #endif 2206 2207 // Increase some data structure sizes for efficiency 2208 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2209 return JNI_EINVAL; 2210 } 2211 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2212 return JNI_EINVAL; 2213 } 2214 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2215 return JNI_EINVAL; 2216 } 2217 2218 // See the OldPLABSize comment below, but replace 'after promotion' 2219 // with 'after copying'. YoungPLABSize is the size of the survivor 2220 // space per-gc-thread buffers. The default is 4kw. 2221 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2222 return JNI_EINVAL; 2223 } 2224 2225 // OldPLABSize is the size of the buffers in the old gen that 2226 // UseParallelGC uses to promote live data that doesn't fit in the 2227 // survivor spaces. At any given time, there's one for each gc thread. 2228 // The default size is 1kw. These buffers are rarely used, since the 2229 // survivor spaces are usually big enough. For specjbb, however, there 2230 // are occasions when there's lots of live data in the young gen 2231 // and we end up promoting some of it. We don't have a definite 2232 // explanation for why bumping OldPLABSize helps, but the theory 2233 // is that a bigger PLAB results in retaining something like the 2234 // original allocation order after promotion, which improves mutator 2235 // locality. A minor effect may be that larger PLABs reduce the 2236 // number of PLAB allocation events during gc. The value of 8kw 2237 // was arrived at by experimenting with specjbb. 2238 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2239 return JNI_EINVAL; 2240 } 2241 2242 // Enable parallel GC and adaptive generation sizing 2243 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2244 return JNI_EINVAL; 2245 } 2246 FLAG_SET_DEFAULT(ParallelGCThreads, 2247 Abstract_VM_Version::parallel_worker_threads()); 2248 2249 // Encourage steady state memory management 2250 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2251 return JNI_EINVAL; 2252 } 2253 2254 // This appears to improve mutator locality 2255 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2256 return JNI_EINVAL; 2257 } 2258 2259 // Get around early Solaris scheduling bug 2260 // (affinity vs other jobs on system) 2261 // but disallow DR and offlining (5008695). 2262 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2263 return JNI_EINVAL; 2264 } 2265 2266 return JNI_OK; 2267 } 2268 2269 // This must be called after ergonomics. 2270 void Arguments::set_bytecode_flags() { 2271 if (!RewriteBytecodes) { 2272 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2273 } 2274 } 2275 2276 // Aggressive optimization flags -XX:+AggressiveOpts 2277 jint Arguments::set_aggressive_opts_flags() { 2278 #ifdef COMPILER2 2279 if (AggressiveUnboxing) { 2280 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2281 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2282 } else if (!EliminateAutoBox) { 2283 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2284 AggressiveUnboxing = false; 2285 } 2286 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2287 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2288 } else if (!DoEscapeAnalysis) { 2289 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2290 AggressiveUnboxing = false; 2291 } 2292 } 2293 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2294 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2295 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2296 } 2297 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2298 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2299 } 2300 2301 // Feed the cache size setting into the JDK 2302 char buffer[1024]; 2303 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2304 if (!add_property(buffer)) { 2305 return JNI_ENOMEM; 2306 } 2307 } 2308 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2309 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2310 } 2311 #endif 2312 2313 if (AggressiveOpts) { 2314 // Sample flag setting code 2315 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2316 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2317 // } 2318 } 2319 2320 return JNI_OK; 2321 } 2322 2323 //=========================================================================================================== 2324 // Parsing of java.compiler property 2325 2326 void Arguments::process_java_compiler_argument(const char* arg) { 2327 // For backwards compatibility, Djava.compiler=NONE or "" 2328 // causes us to switch to -Xint mode UNLESS -Xdebug 2329 // is also specified. 2330 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2331 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2332 } 2333 } 2334 2335 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2336 _sun_java_launcher = os::strdup_check_oom(launcher); 2337 } 2338 2339 bool Arguments::created_by_java_launcher() { 2340 assert(_sun_java_launcher != NULL, "property must have value"); 2341 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2342 } 2343 2344 bool Arguments::sun_java_launcher_is_altjvm() { 2345 return _sun_java_launcher_is_altjvm; 2346 } 2347 2348 //=========================================================================================================== 2349 // Parsing of main arguments 2350 2351 #if INCLUDE_JVMCI 2352 // Check consistency of jvmci vm argument settings. 2353 bool Arguments::check_jvmci_args_consistency() { 2354 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2355 } 2356 #endif //INCLUDE_JVMCI 2357 2358 // Check consistency of GC selection 2359 bool Arguments::check_gc_consistency() { 2360 // Ensure that the user has not selected conflicting sets 2361 // of collectors. 2362 uint i = 0; 2363 if (UseSerialGC) i++; 2364 if (UseConcMarkSweepGC) i++; 2365 if (UseParallelGC || UseParallelOldGC) i++; 2366 if (UseG1GC) i++; 2367 if (i > 1) { 2368 jio_fprintf(defaultStream::error_stream(), 2369 "Conflicting collector combinations in option list; " 2370 "please refer to the release notes for the combinations " 2371 "allowed\n"); 2372 return false; 2373 } 2374 2375 return true; 2376 } 2377 2378 // Check the consistency of vm_init_args 2379 bool Arguments::check_vm_args_consistency() { 2380 // Method for adding checks for flag consistency. 2381 // The intent is to warn the user of all possible conflicts, 2382 // before returning an error. 2383 // Note: Needs platform-dependent factoring. 2384 bool status = true; 2385 2386 if (TLABRefillWasteFraction == 0) { 2387 jio_fprintf(defaultStream::error_stream(), 2388 "TLABRefillWasteFraction should be a denominator, " 2389 "not " SIZE_FORMAT "\n", 2390 TLABRefillWasteFraction); 2391 status = false; 2392 } 2393 2394 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2395 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2396 } 2397 2398 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2399 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2400 } 2401 2402 if (GCTimeLimit == 100) { 2403 // Turn off gc-overhead-limit-exceeded checks 2404 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2405 } 2406 2407 status = status && check_gc_consistency(); 2408 2409 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2410 // insists that we hold the requisite locks so that the iteration is 2411 // MT-safe. For the verification at start-up and shut-down, we don't 2412 // yet have a good way of acquiring and releasing these locks, 2413 // which are not visible at the CollectedHeap level. We want to 2414 // be able to acquire these locks and then do the iteration rather 2415 // than just disable the lock verification. This will be fixed under 2416 // bug 4788986. 2417 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2418 if (VerifyDuringStartup) { 2419 warning("Heap verification at start-up disabled " 2420 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2421 VerifyDuringStartup = false; // Disable verification at start-up 2422 } 2423 2424 if (VerifyBeforeExit) { 2425 warning("Heap verification at shutdown disabled " 2426 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2427 VerifyBeforeExit = false; // Disable verification at shutdown 2428 } 2429 } 2430 2431 if (PrintNMTStatistics) { 2432 #if INCLUDE_NMT 2433 if (MemTracker::tracking_level() == NMT_off) { 2434 #endif // INCLUDE_NMT 2435 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2436 PrintNMTStatistics = false; 2437 #if INCLUDE_NMT 2438 } 2439 #endif 2440 } 2441 2442 #if INCLUDE_JVMCI 2443 status = status && check_jvmci_args_consistency(); 2444 2445 if (EnableJVMCI) { 2446 if (!ScavengeRootsInCode) { 2447 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2448 ScavengeRootsInCode = 1; 2449 } 2450 } 2451 #endif 2452 2453 // Check lower bounds of the code cache 2454 // Template Interpreter code is approximately 3X larger in debug builds. 2455 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2456 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2457 jio_fprintf(defaultStream::error_stream(), 2458 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2459 os::vm_page_size()/K); 2460 status = false; 2461 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2462 jio_fprintf(defaultStream::error_stream(), 2463 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2464 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2465 status = false; 2466 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2467 jio_fprintf(defaultStream::error_stream(), 2468 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2469 min_code_cache_size/K); 2470 status = false; 2471 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2472 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2473 jio_fprintf(defaultStream::error_stream(), 2474 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2475 CODE_CACHE_SIZE_LIMIT/M); 2476 status = false; 2477 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2478 jio_fprintf(defaultStream::error_stream(), 2479 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2480 min_code_cache_size/K); 2481 status = false; 2482 } 2483 2484 #ifdef _LP64 2485 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2486 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2487 } 2488 #endif 2489 2490 #ifndef SUPPORT_RESERVED_STACK_AREA 2491 if (StackReservedPages != 0) { 2492 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2493 warning("Reserved Stack Area not supported on this platform"); 2494 } 2495 #endif 2496 2497 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2498 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2499 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2500 } 2501 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2502 } 2503 if (UseCompiler && is_interpreter_only()) { 2504 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2505 warning("UseCompiler disabled due to -Xint."); 2506 } 2507 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2508 } 2509 #ifdef COMPILER2 2510 if (PostLoopMultiversioning && !RangeCheckElimination) { 2511 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2512 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2513 } 2514 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2515 } 2516 #endif 2517 return status; 2518 } 2519 2520 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2521 const char* option_type) { 2522 if (ignore) return false; 2523 2524 const char* spacer = " "; 2525 if (option_type == NULL) { 2526 option_type = ++spacer; // Set both to the empty string. 2527 } 2528 2529 if (os::obsolete_option(option)) { 2530 jio_fprintf(defaultStream::error_stream(), 2531 "Obsolete %s%soption: %s\n", option_type, spacer, 2532 option->optionString); 2533 return false; 2534 } else { 2535 jio_fprintf(defaultStream::error_stream(), 2536 "Unrecognized %s%soption: %s\n", option_type, spacer, 2537 option->optionString); 2538 return true; 2539 } 2540 } 2541 2542 static const char* user_assertion_options[] = { 2543 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2544 }; 2545 2546 static const char* system_assertion_options[] = { 2547 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2548 }; 2549 2550 bool Arguments::parse_uintx(const char* value, 2551 uintx* uintx_arg, 2552 uintx min_size) { 2553 2554 // Check the sign first since atojulong() parses only unsigned values. 2555 bool value_is_positive = !(*value == '-'); 2556 2557 if (value_is_positive) { 2558 julong n; 2559 bool good_return = atojulong(value, &n); 2560 if (good_return) { 2561 bool above_minimum = n >= min_size; 2562 bool value_is_too_large = n > max_uintx; 2563 2564 if (above_minimum && !value_is_too_large) { 2565 *uintx_arg = n; 2566 return true; 2567 } 2568 } 2569 } 2570 return false; 2571 } 2572 2573 unsigned int addreads_count = 0; 2574 unsigned int addexports_count = 0; 2575 unsigned int addopens_count = 0; 2576 unsigned int addmods_count = 0; 2577 unsigned int patch_mod_count = 0; 2578 2579 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2580 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2581 char* property = AllocateHeap(prop_len, mtArguments); 2582 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2583 if (ret < 0 || ret >= (int)prop_len) { 2584 FreeHeap(property); 2585 return false; 2586 } 2587 bool added = add_property(property, UnwriteableProperty, internal); 2588 FreeHeap(property); 2589 return added; 2590 } 2591 2592 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2593 const unsigned int props_count_limit = 1000; 2594 const int max_digits = 3; 2595 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2596 2597 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2598 if (count < props_count_limit) { 2599 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2600 char* property = AllocateHeap(prop_len, mtArguments); 2601 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2602 if (ret < 0 || ret >= (int)prop_len) { 2603 FreeHeap(property); 2604 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2605 return false; 2606 } 2607 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2608 FreeHeap(property); 2609 return added; 2610 } 2611 2612 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2613 return false; 2614 } 2615 2616 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2617 julong* long_arg, 2618 julong min_size) { 2619 if (!atojulong(s, long_arg)) return arg_unreadable; 2620 return check_memory_size(*long_arg, min_size); 2621 } 2622 2623 // Parse JavaVMInitArgs structure 2624 2625 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2626 const JavaVMInitArgs *java_options_args, 2627 const JavaVMInitArgs *cmd_line_args) { 2628 bool patch_mod_javabase = false; 2629 2630 // Save default settings for some mode flags 2631 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2632 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2633 Arguments::_ClipInlining = ClipInlining; 2634 Arguments::_BackgroundCompilation = BackgroundCompilation; 2635 if (TieredCompilation) { 2636 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2637 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2638 } 2639 2640 // Setup flags for mixed which is the default 2641 set_mode_flags(_mixed); 2642 2643 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2644 // variable (if present). 2645 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2646 if (result != JNI_OK) { 2647 return result; 2648 } 2649 2650 // Parse args structure generated from the command line flags. 2651 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2652 if (result != JNI_OK) { 2653 return result; 2654 } 2655 2656 // Parse args structure generated from the _JAVA_OPTIONS environment 2657 // variable (if present) (mimics classic VM) 2658 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2659 if (result != JNI_OK) { 2660 return result; 2661 } 2662 2663 // Do final processing now that all arguments have been parsed 2664 result = finalize_vm_init_args(); 2665 if (result != JNI_OK) { 2666 return result; 2667 } 2668 2669 #if INCLUDE_CDS 2670 if (UseSharedSpaces && patch_mod_javabase) { 2671 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 2672 } 2673 #endif 2674 2675 return JNI_OK; 2676 } 2677 2678 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2679 // represents a valid JDWP agent. is_path==true denotes that we 2680 // are dealing with -agentpath (case where name is a path), otherwise with 2681 // -agentlib 2682 bool valid_jdwp_agent(char *name, bool is_path) { 2683 char *_name; 2684 const char *_jdwp = "jdwp"; 2685 size_t _len_jdwp, _len_prefix; 2686 2687 if (is_path) { 2688 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2689 return false; 2690 } 2691 2692 _name++; // skip past last path separator 2693 _len_prefix = strlen(JNI_LIB_PREFIX); 2694 2695 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2696 return false; 2697 } 2698 2699 _name += _len_prefix; 2700 _len_jdwp = strlen(_jdwp); 2701 2702 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2703 _name += _len_jdwp; 2704 } 2705 else { 2706 return false; 2707 } 2708 2709 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2710 return false; 2711 } 2712 2713 return true; 2714 } 2715 2716 if (strcmp(name, _jdwp) == 0) { 2717 return true; 2718 } 2719 2720 return false; 2721 } 2722 2723 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2724 // --patch-module=<module>=<file>(<pathsep><file>)* 2725 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2726 // Find the equal sign between the module name and the path specification 2727 const char* module_equal = strchr(patch_mod_tail, '='); 2728 if (module_equal == NULL) { 2729 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2730 return JNI_ERR; 2731 } else { 2732 // Pick out the module name 2733 size_t module_len = module_equal - patch_mod_tail; 2734 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2735 if (module_name != NULL) { 2736 memcpy(module_name, patch_mod_tail, module_len); 2737 *(module_name + module_len) = '\0'; 2738 // The path piece begins one past the module_equal sign 2739 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2740 FREE_C_HEAP_ARRAY(char, module_name); 2741 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2742 return JNI_ENOMEM; 2743 } 2744 } else { 2745 return JNI_ENOMEM; 2746 } 2747 } 2748 return JNI_OK; 2749 } 2750 2751 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2752 // For match_option to return remaining or value part of option string 2753 const char* tail; 2754 2755 // iterate over arguments 2756 for (int index = 0; index < args->nOptions; index++) { 2757 bool is_absolute_path = false; // for -agentpath vs -agentlib 2758 2759 const JavaVMOption* option = args->options + index; 2760 2761 if (!match_option(option, "-Djava.class.path", &tail) && 2762 !match_option(option, "-Dsun.java.command", &tail) && 2763 !match_option(option, "-Dsun.java.launcher", &tail)) { 2764 2765 // add all jvm options to the jvm_args string. This string 2766 // is used later to set the java.vm.args PerfData string constant. 2767 // the -Djava.class.path and the -Dsun.java.command options are 2768 // omitted from jvm_args string as each have their own PerfData 2769 // string constant object. 2770 build_jvm_args(option->optionString); 2771 } 2772 2773 // -verbose:[class/gc/jni] 2774 if (match_option(option, "-verbose", &tail)) { 2775 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2776 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2777 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2778 } else if (!strcmp(tail, ":gc")) { 2779 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2780 } else if (!strcmp(tail, ":jni")) { 2781 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2782 return JNI_EINVAL; 2783 } 2784 } 2785 // -da / -ea / -disableassertions / -enableassertions 2786 // These accept an optional class/package name separated by a colon, e.g., 2787 // -da:java.lang.Thread. 2788 } else if (match_option(option, user_assertion_options, &tail, true)) { 2789 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2790 if (*tail == '\0') { 2791 JavaAssertions::setUserClassDefault(enable); 2792 } else { 2793 assert(*tail == ':', "bogus match by match_option()"); 2794 JavaAssertions::addOption(tail + 1, enable); 2795 } 2796 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2797 } else if (match_option(option, system_assertion_options, &tail, false)) { 2798 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2799 JavaAssertions::setSystemClassDefault(enable); 2800 // -bootclasspath: 2801 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2802 jio_fprintf(defaultStream::output_stream(), 2803 "-Xbootclasspath is no longer a supported option.\n"); 2804 return JNI_EINVAL; 2805 // -bootclasspath/a: 2806 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2807 Arguments::append_sysclasspath(tail); 2808 // -bootclasspath/p: 2809 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2810 jio_fprintf(defaultStream::output_stream(), 2811 "-Xbootclasspath/p is no longer a supported option.\n"); 2812 return JNI_EINVAL; 2813 // -Xrun 2814 } else if (match_option(option, "-Xrun", &tail)) { 2815 if (tail != NULL) { 2816 const char* pos = strchr(tail, ':'); 2817 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2818 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2819 jio_snprintf(name, len + 1, "%s", tail); 2820 2821 char *options = NULL; 2822 if(pos != NULL) { 2823 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2824 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2825 } 2826 #if !INCLUDE_JVMTI 2827 if (strcmp(name, "jdwp") == 0) { 2828 jio_fprintf(defaultStream::error_stream(), 2829 "Debugging agents are not supported in this VM\n"); 2830 return JNI_ERR; 2831 } 2832 #endif // !INCLUDE_JVMTI 2833 add_init_library(name, options); 2834 } 2835 } else if (match_option(option, "--add-reads=", &tail)) { 2836 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2837 return JNI_ENOMEM; 2838 } 2839 } else if (match_option(option, "--add-exports=", &tail)) { 2840 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2841 return JNI_ENOMEM; 2842 } 2843 } else if (match_option(option, "--add-opens=", &tail)) { 2844 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2845 return JNI_ENOMEM; 2846 } 2847 } else if (match_option(option, "--add-modules=", &tail)) { 2848 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2849 return JNI_ENOMEM; 2850 } 2851 } else if (match_option(option, "--limit-modules=", &tail)) { 2852 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2853 return JNI_ENOMEM; 2854 } 2855 } else if (match_option(option, "--module-path=", &tail)) { 2856 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2857 return JNI_ENOMEM; 2858 } 2859 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2860 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2861 return JNI_ENOMEM; 2862 } 2863 } else if (match_option(option, "--patch-module=", &tail)) { 2864 // --patch-module=<module>=<file>(<pathsep><file>)* 2865 int res = process_patch_mod_option(tail, patch_mod_javabase); 2866 if (res != JNI_OK) { 2867 return res; 2868 } 2869 } else if (match_option(option, "--permit-illegal-access")) { 2870 if (!create_property("jdk.module.permitIllegalAccess", "true", ExternalProperty)) { 2871 return JNI_ENOMEM; 2872 } 2873 // -agentlib and -agentpath 2874 } else if (match_option(option, "-agentlib:", &tail) || 2875 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2876 if(tail != NULL) { 2877 const char* pos = strchr(tail, '='); 2878 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2879 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2880 name[len] = '\0'; 2881 2882 char *options = NULL; 2883 if(pos != NULL) { 2884 options = os::strdup_check_oom(pos + 1, mtArguments); 2885 } 2886 #if !INCLUDE_JVMTI 2887 if (valid_jdwp_agent(name, is_absolute_path)) { 2888 jio_fprintf(defaultStream::error_stream(), 2889 "Debugging agents are not supported in this VM\n"); 2890 return JNI_ERR; 2891 } 2892 #endif // !INCLUDE_JVMTI 2893 add_init_agent(name, options, is_absolute_path); 2894 } 2895 // -javaagent 2896 } else if (match_option(option, "-javaagent:", &tail)) { 2897 #if !INCLUDE_JVMTI 2898 jio_fprintf(defaultStream::error_stream(), 2899 "Instrumentation agents are not supported in this VM\n"); 2900 return JNI_ERR; 2901 #else 2902 if (tail != NULL) { 2903 size_t length = strlen(tail) + 1; 2904 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2905 jio_snprintf(options, length, "%s", tail); 2906 add_init_agent("instrument", options, false); 2907 // java agents need module java.instrument 2908 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2909 return JNI_ENOMEM; 2910 } 2911 } 2912 #endif // !INCLUDE_JVMTI 2913 // -Xnoclassgc 2914 } else if (match_option(option, "-Xnoclassgc")) { 2915 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2916 return JNI_EINVAL; 2917 } 2918 // -Xconcgc 2919 } else if (match_option(option, "-Xconcgc")) { 2920 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2921 return JNI_EINVAL; 2922 } 2923 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2924 // -Xnoconcgc 2925 } else if (match_option(option, "-Xnoconcgc")) { 2926 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2927 return JNI_EINVAL; 2928 } 2929 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2930 // -Xbatch 2931 } else if (match_option(option, "-Xbatch")) { 2932 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2933 return JNI_EINVAL; 2934 } 2935 // -Xmn for compatibility with other JVM vendors 2936 } else if (match_option(option, "-Xmn", &tail)) { 2937 julong long_initial_young_size = 0; 2938 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2939 if (errcode != arg_in_range) { 2940 jio_fprintf(defaultStream::error_stream(), 2941 "Invalid initial young generation size: %s\n", option->optionString); 2942 describe_range_error(errcode); 2943 return JNI_EINVAL; 2944 } 2945 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2946 return JNI_EINVAL; 2947 } 2948 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2949 return JNI_EINVAL; 2950 } 2951 // -Xms 2952 } else if (match_option(option, "-Xms", &tail)) { 2953 julong long_initial_heap_size = 0; 2954 // an initial heap size of 0 means automatically determine 2955 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2956 if (errcode != arg_in_range) { 2957 jio_fprintf(defaultStream::error_stream(), 2958 "Invalid initial heap size: %s\n", option->optionString); 2959 describe_range_error(errcode); 2960 return JNI_EINVAL; 2961 } 2962 set_min_heap_size((size_t)long_initial_heap_size); 2963 // Currently the minimum size and the initial heap sizes are the same. 2964 // Can be overridden with -XX:InitialHeapSize. 2965 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2966 return JNI_EINVAL; 2967 } 2968 // -Xmx 2969 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2970 julong long_max_heap_size = 0; 2971 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2972 if (errcode != arg_in_range) { 2973 jio_fprintf(defaultStream::error_stream(), 2974 "Invalid maximum heap size: %s\n", option->optionString); 2975 describe_range_error(errcode); 2976 return JNI_EINVAL; 2977 } 2978 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2979 return JNI_EINVAL; 2980 } 2981 // Xmaxf 2982 } else if (match_option(option, "-Xmaxf", &tail)) { 2983 char* err; 2984 int maxf = (int)(strtod(tail, &err) * 100); 2985 if (*err != '\0' || *tail == '\0') { 2986 jio_fprintf(defaultStream::error_stream(), 2987 "Bad max heap free percentage size: %s\n", 2988 option->optionString); 2989 return JNI_EINVAL; 2990 } else { 2991 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 } 2995 // Xminf 2996 } else if (match_option(option, "-Xminf", &tail)) { 2997 char* err; 2998 int minf = (int)(strtod(tail, &err) * 100); 2999 if (*err != '\0' || *tail == '\0') { 3000 jio_fprintf(defaultStream::error_stream(), 3001 "Bad min heap free percentage size: %s\n", 3002 option->optionString); 3003 return JNI_EINVAL; 3004 } else { 3005 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3006 return JNI_EINVAL; 3007 } 3008 } 3009 // -Xss 3010 } else if (match_option(option, "-Xss", &tail)) { 3011 julong long_ThreadStackSize = 0; 3012 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3013 if (errcode != arg_in_range) { 3014 jio_fprintf(defaultStream::error_stream(), 3015 "Invalid thread stack size: %s\n", option->optionString); 3016 describe_range_error(errcode); 3017 return JNI_EINVAL; 3018 } 3019 // Internally track ThreadStackSize in units of 1024 bytes. 3020 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 3021 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 3022 return JNI_EINVAL; 3023 } 3024 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 3025 } else if (match_option(option, "-Xoss", &tail) || 3026 match_option(option, "-Xsqnopause") || 3027 match_option(option, "-Xoptimize") || 3028 match_option(option, "-Xboundthreads") || 3029 match_option(option, "-Xusealtsigs")) { 3030 // All these options are deprecated in JDK 9 and will be removed in a future release 3031 char version[256]; 3032 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3033 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3034 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3035 julong long_CodeCacheExpansionSize = 0; 3036 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3037 if (errcode != arg_in_range) { 3038 jio_fprintf(defaultStream::error_stream(), 3039 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3040 os::vm_page_size()/K); 3041 return JNI_EINVAL; 3042 } 3043 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3044 return JNI_EINVAL; 3045 } 3046 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3047 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3048 julong long_ReservedCodeCacheSize = 0; 3049 3050 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3051 if (errcode != arg_in_range) { 3052 jio_fprintf(defaultStream::error_stream(), 3053 "Invalid maximum code cache size: %s.\n", option->optionString); 3054 return JNI_EINVAL; 3055 } 3056 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3057 return JNI_EINVAL; 3058 } 3059 // -XX:NonNMethodCodeHeapSize= 3060 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3061 julong long_NonNMethodCodeHeapSize = 0; 3062 3063 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3064 if (errcode != arg_in_range) { 3065 jio_fprintf(defaultStream::error_stream(), 3066 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3067 return JNI_EINVAL; 3068 } 3069 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3070 return JNI_EINVAL; 3071 } 3072 // -XX:ProfiledCodeHeapSize= 3073 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3074 julong long_ProfiledCodeHeapSize = 0; 3075 3076 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3077 if (errcode != arg_in_range) { 3078 jio_fprintf(defaultStream::error_stream(), 3079 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3080 return JNI_EINVAL; 3081 } 3082 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3083 return JNI_EINVAL; 3084 } 3085 // -XX:NonProfiledCodeHeapSizee= 3086 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3087 julong long_NonProfiledCodeHeapSize = 0; 3088 3089 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3090 if (errcode != arg_in_range) { 3091 jio_fprintf(defaultStream::error_stream(), 3092 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3093 return JNI_EINVAL; 3094 } 3095 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3096 return JNI_EINVAL; 3097 } 3098 // -green 3099 } else if (match_option(option, "-green")) { 3100 jio_fprintf(defaultStream::error_stream(), 3101 "Green threads support not available\n"); 3102 return JNI_EINVAL; 3103 // -native 3104 } else if (match_option(option, "-native")) { 3105 // HotSpot always uses native threads, ignore silently for compatibility 3106 // -Xrs 3107 } else if (match_option(option, "-Xrs")) { 3108 // Classic/EVM option, new functionality 3109 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3110 return JNI_EINVAL; 3111 } 3112 // -Xprof 3113 } else if (match_option(option, "-Xprof")) { 3114 #if INCLUDE_FPROF 3115 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release."); 3116 _has_profile = true; 3117 #else // INCLUDE_FPROF 3118 jio_fprintf(defaultStream::error_stream(), 3119 "Flat profiling is not supported in this VM.\n"); 3120 return JNI_ERR; 3121 #endif // INCLUDE_FPROF 3122 // -Xconcurrentio 3123 } else if (match_option(option, "-Xconcurrentio")) { 3124 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3125 return JNI_EINVAL; 3126 } 3127 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3128 return JNI_EINVAL; 3129 } 3130 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3131 return JNI_EINVAL; 3132 } 3133 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3134 return JNI_EINVAL; 3135 } 3136 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3137 return JNI_EINVAL; 3138 } 3139 3140 // -Xinternalversion 3141 } else if (match_option(option, "-Xinternalversion")) { 3142 jio_fprintf(defaultStream::output_stream(), "%s\n", 3143 VM_Version::internal_vm_info_string()); 3144 vm_exit(0); 3145 #ifndef PRODUCT 3146 // -Xprintflags 3147 } else if (match_option(option, "-Xprintflags")) { 3148 CommandLineFlags::printFlags(tty, false); 3149 vm_exit(0); 3150 #endif 3151 // -D 3152 } else if (match_option(option, "-D", &tail)) { 3153 const char* value; 3154 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3155 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3156 // abort if -Djava.endorsed.dirs is set 3157 jio_fprintf(defaultStream::output_stream(), 3158 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3159 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3160 return JNI_EINVAL; 3161 } 3162 if (match_option(option, "-Djava.ext.dirs=", &value) && 3163 *value != '\0' && strcmp(value, "\"\"") != 0) { 3164 // abort if -Djava.ext.dirs is set 3165 jio_fprintf(defaultStream::output_stream(), 3166 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3167 return JNI_EINVAL; 3168 } 3169 // Check for module related properties. They must be set using the modules 3170 // options. For example: use "--add-modules=java.sql", not 3171 // "-Djdk.module.addmods=java.sql" 3172 if (is_internal_module_property(option->optionString + 2)) { 3173 needs_module_property_warning = true; 3174 continue; 3175 } 3176 3177 if (!add_property(tail)) { 3178 return JNI_ENOMEM; 3179 } 3180 // Out of the box management support 3181 if (match_option(option, "-Dcom.sun.management", &tail)) { 3182 #if INCLUDE_MANAGEMENT 3183 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3184 return JNI_EINVAL; 3185 } 3186 // management agent in module jdk.management.agent 3187 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3188 return JNI_ENOMEM; 3189 } 3190 #else 3191 jio_fprintf(defaultStream::output_stream(), 3192 "-Dcom.sun.management is not supported in this VM.\n"); 3193 return JNI_ERR; 3194 #endif 3195 } 3196 // -Xint 3197 } else if (match_option(option, "-Xint")) { 3198 set_mode_flags(_int); 3199 // -Xmixed 3200 } else if (match_option(option, "-Xmixed")) { 3201 set_mode_flags(_mixed); 3202 // -Xcomp 3203 } else if (match_option(option, "-Xcomp")) { 3204 // for testing the compiler; turn off all flags that inhibit compilation 3205 set_mode_flags(_comp); 3206 // -Xshare:dump 3207 } else if (match_option(option, "-Xshare:dump")) { 3208 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3209 return JNI_EINVAL; 3210 } 3211 set_mode_flags(_int); // Prevent compilation, which creates objects 3212 // -Xshare:on 3213 } else if (match_option(option, "-Xshare:on")) { 3214 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3215 return JNI_EINVAL; 3216 } 3217 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3218 return JNI_EINVAL; 3219 } 3220 // -Xshare:auto 3221 } else if (match_option(option, "-Xshare:auto")) { 3222 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3223 return JNI_EINVAL; 3224 } 3225 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3226 return JNI_EINVAL; 3227 } 3228 // -Xshare:off 3229 } else if (match_option(option, "-Xshare:off")) { 3230 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3231 return JNI_EINVAL; 3232 } 3233 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3234 return JNI_EINVAL; 3235 } 3236 // -Xverify 3237 } else if (match_option(option, "-Xverify", &tail)) { 3238 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3239 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3240 return JNI_EINVAL; 3241 } 3242 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3243 return JNI_EINVAL; 3244 } 3245 } else if (strcmp(tail, ":remote") == 0) { 3246 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3247 return JNI_EINVAL; 3248 } 3249 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3250 return JNI_EINVAL; 3251 } 3252 } else if (strcmp(tail, ":none") == 0) { 3253 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3254 return JNI_EINVAL; 3255 } 3256 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3257 return JNI_EINVAL; 3258 } 3259 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3260 return JNI_EINVAL; 3261 } 3262 // -Xdebug 3263 } else if (match_option(option, "-Xdebug")) { 3264 // note this flag has been used, then ignore 3265 set_xdebug_mode(true); 3266 // -Xnoagent 3267 } else if (match_option(option, "-Xnoagent")) { 3268 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3269 } else if (match_option(option, "-Xloggc:", &tail)) { 3270 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3271 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3272 _gc_log_filename = os::strdup_check_oom(tail); 3273 } else if (match_option(option, "-Xlog", &tail)) { 3274 bool ret = false; 3275 if (strcmp(tail, ":help") == 0) { 3276 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3277 vm_exit(0); 3278 } else if (strcmp(tail, ":disable") == 0) { 3279 LogConfiguration::disable_logging(); 3280 ret = true; 3281 } else if (*tail == '\0') { 3282 ret = LogConfiguration::parse_command_line_arguments(); 3283 assert(ret, "-Xlog without arguments should never fail to parse"); 3284 } else if (*tail == ':') { 3285 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3286 } 3287 if (ret == false) { 3288 jio_fprintf(defaultStream::error_stream(), 3289 "Invalid -Xlog option '-Xlog%s'\n", 3290 tail); 3291 return JNI_EINVAL; 3292 } 3293 // JNI hooks 3294 } else if (match_option(option, "-Xcheck", &tail)) { 3295 if (!strcmp(tail, ":jni")) { 3296 #if !INCLUDE_JNI_CHECK 3297 warning("JNI CHECKING is not supported in this VM"); 3298 #else 3299 CheckJNICalls = true; 3300 #endif // INCLUDE_JNI_CHECK 3301 } else if (is_bad_option(option, args->ignoreUnrecognized, 3302 "check")) { 3303 return JNI_EINVAL; 3304 } 3305 } else if (match_option(option, "vfprintf")) { 3306 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3307 } else if (match_option(option, "exit")) { 3308 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3309 } else if (match_option(option, "abort")) { 3310 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3311 // -XX:+AggressiveHeap 3312 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3313 jint result = set_aggressive_heap_flags(); 3314 if (result != JNI_OK) { 3315 return result; 3316 } 3317 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3318 // and the last option wins. 3319 } else if (match_option(option, "-XX:+NeverTenure")) { 3320 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3321 return JNI_EINVAL; 3322 } 3323 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3324 return JNI_EINVAL; 3325 } 3326 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3327 return JNI_EINVAL; 3328 } 3329 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3330 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3331 return JNI_EINVAL; 3332 } 3333 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3334 return JNI_EINVAL; 3335 } 3336 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3337 return JNI_EINVAL; 3338 } 3339 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3340 uintx max_tenuring_thresh = 0; 3341 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3342 jio_fprintf(defaultStream::error_stream(), 3343 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3344 return JNI_EINVAL; 3345 } 3346 3347 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3348 return JNI_EINVAL; 3349 } 3350 3351 if (MaxTenuringThreshold == 0) { 3352 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3353 return JNI_EINVAL; 3354 } 3355 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3356 return JNI_EINVAL; 3357 } 3358 } else { 3359 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3360 return JNI_EINVAL; 3361 } 3362 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3363 return JNI_EINVAL; 3364 } 3365 } 3366 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3367 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3368 return JNI_EINVAL; 3369 } 3370 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3371 return JNI_EINVAL; 3372 } 3373 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3374 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3375 return JNI_EINVAL; 3376 } 3377 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3378 return JNI_EINVAL; 3379 } 3380 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3381 #if defined(DTRACE_ENABLED) 3382 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3383 return JNI_EINVAL; 3384 } 3385 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3386 return JNI_EINVAL; 3387 } 3388 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3389 return JNI_EINVAL; 3390 } 3391 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3392 return JNI_EINVAL; 3393 } 3394 #else // defined(DTRACE_ENABLED) 3395 jio_fprintf(defaultStream::error_stream(), 3396 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3397 return JNI_EINVAL; 3398 #endif // defined(DTRACE_ENABLED) 3399 #ifdef ASSERT 3400 } else if (match_option(option, "-XX:+FullGCALot")) { 3401 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3402 return JNI_EINVAL; 3403 } 3404 // disable scavenge before parallel mark-compact 3405 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3406 return JNI_EINVAL; 3407 } 3408 #endif 3409 #if !INCLUDE_MANAGEMENT 3410 } else if (match_option(option, "-XX:+ManagementServer")) { 3411 jio_fprintf(defaultStream::error_stream(), 3412 "ManagementServer is not supported in this VM.\n"); 3413 return JNI_ERR; 3414 #endif // INCLUDE_MANAGEMENT 3415 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3416 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3417 // already been handled 3418 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3419 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3420 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3421 return JNI_EINVAL; 3422 } 3423 } 3424 // Unknown option 3425 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3426 return JNI_ERR; 3427 } 3428 } 3429 3430 // PrintSharedArchiveAndExit will turn on 3431 // -Xshare:on 3432 // -Xlog:class+path=info 3433 if (PrintSharedArchiveAndExit) { 3434 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3435 return JNI_EINVAL; 3436 } 3437 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3438 return JNI_EINVAL; 3439 } 3440 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3441 } 3442 3443 // Change the default value for flags which have different default values 3444 // when working with older JDKs. 3445 #ifdef LINUX 3446 if (JDK_Version::current().compare_major(6) <= 0 && 3447 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3448 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3449 } 3450 #endif // LINUX 3451 fix_appclasspath(); 3452 return JNI_OK; 3453 } 3454 3455 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3456 // For java.base check for duplicate --patch-module options being specified on the command line. 3457 // This check is only required for java.base, all other duplicate module specifications 3458 // will be checked during module system initialization. The module system initialization 3459 // will throw an ExceptionInInitializerError if this situation occurs. 3460 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3461 if (*patch_mod_javabase) { 3462 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3463 } else { 3464 *patch_mod_javabase = true; 3465 } 3466 } 3467 3468 // Create GrowableArray lazily, only if --patch-module has been specified 3469 if (_patch_mod_prefix == NULL) { 3470 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3471 } 3472 3473 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3474 } 3475 3476 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3477 // 3478 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3479 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3480 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3481 // path is treated as the current directory. 3482 // 3483 // This causes problems with CDS, which requires that all directories specified in the classpath 3484 // must be empty. In most cases, applications do NOT want to load classes from the current 3485 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3486 // scripts compatible with CDS. 3487 void Arguments::fix_appclasspath() { 3488 if (IgnoreEmptyClassPaths) { 3489 const char separator = *os::path_separator(); 3490 const char* src = _java_class_path->value(); 3491 3492 // skip over all the leading empty paths 3493 while (*src == separator) { 3494 src ++; 3495 } 3496 3497 char* copy = os::strdup_check_oom(src, mtArguments); 3498 3499 // trim all trailing empty paths 3500 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3501 *tail = '\0'; 3502 } 3503 3504 char from[3] = {separator, separator, '\0'}; 3505 char to [2] = {separator, '\0'}; 3506 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3507 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3508 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3509 } 3510 3511 _java_class_path->set_writeable_value(copy); 3512 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3513 } 3514 } 3515 3516 static bool has_jar_files(const char* directory) { 3517 DIR* dir = os::opendir(directory); 3518 if (dir == NULL) return false; 3519 3520 struct dirent *entry; 3521 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3522 bool hasJarFile = false; 3523 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3524 const char* name = entry->d_name; 3525 const char* ext = name + strlen(name) - 4; 3526 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3527 } 3528 FREE_C_HEAP_ARRAY(char, dbuf); 3529 os::closedir(dir); 3530 return hasJarFile ; 3531 } 3532 3533 static int check_non_empty_dirs(const char* path) { 3534 const char separator = *os::path_separator(); 3535 const char* const end = path + strlen(path); 3536 int nonEmptyDirs = 0; 3537 while (path < end) { 3538 const char* tmp_end = strchr(path, separator); 3539 if (tmp_end == NULL) { 3540 if (has_jar_files(path)) { 3541 nonEmptyDirs++; 3542 jio_fprintf(defaultStream::output_stream(), 3543 "Non-empty directory: %s\n", path); 3544 } 3545 path = end; 3546 } else { 3547 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3548 memcpy(dirpath, path, tmp_end - path); 3549 dirpath[tmp_end - path] = '\0'; 3550 if (has_jar_files(dirpath)) { 3551 nonEmptyDirs++; 3552 jio_fprintf(defaultStream::output_stream(), 3553 "Non-empty directory: %s\n", dirpath); 3554 } 3555 FREE_C_HEAP_ARRAY(char, dirpath); 3556 path = tmp_end + 1; 3557 } 3558 } 3559 return nonEmptyDirs; 3560 } 3561 3562 jint Arguments::finalize_vm_init_args() { 3563 // check if the default lib/endorsed directory exists; if so, error 3564 char path[JVM_MAXPATHLEN]; 3565 const char* fileSep = os::file_separator(); 3566 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3567 3568 if (CheckEndorsedAndExtDirs) { 3569 int nonEmptyDirs = 0; 3570 // check endorsed directory 3571 nonEmptyDirs += check_non_empty_dirs(path); 3572 // check the extension directories 3573 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3574 if (nonEmptyDirs > 0) { 3575 return JNI_ERR; 3576 } 3577 } 3578 3579 DIR* dir = os::opendir(path); 3580 if (dir != NULL) { 3581 jio_fprintf(defaultStream::output_stream(), 3582 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3583 "in modular form will be supported via the concept of upgradeable modules.\n"); 3584 os::closedir(dir); 3585 return JNI_ERR; 3586 } 3587 3588 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3589 dir = os::opendir(path); 3590 if (dir != NULL) { 3591 jio_fprintf(defaultStream::output_stream(), 3592 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3593 "Use -classpath instead.\n."); 3594 os::closedir(dir); 3595 return JNI_ERR; 3596 } 3597 3598 // This must be done after all arguments have been processed. 3599 // java_compiler() true means set to "NONE" or empty. 3600 if (java_compiler() && !xdebug_mode()) { 3601 // For backwards compatibility, we switch to interpreted mode if 3602 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3603 // not specified. 3604 set_mode_flags(_int); 3605 } 3606 3607 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3608 // but like -Xint, leave compilation thresholds unaffected. 3609 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3610 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3611 set_mode_flags(_int); 3612 } 3613 3614 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3615 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3616 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3617 } 3618 3619 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3620 // Don't degrade server performance for footprint 3621 if (FLAG_IS_DEFAULT(UseLargePages) && 3622 MaxHeapSize < LargePageHeapSizeThreshold) { 3623 // No need for large granularity pages w/small heaps. 3624 // Note that large pages are enabled/disabled for both the 3625 // Java heap and the code cache. 3626 FLAG_SET_DEFAULT(UseLargePages, false); 3627 } 3628 3629 #elif defined(COMPILER2) 3630 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3631 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3632 } 3633 #endif 3634 3635 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3636 UNSUPPORTED_OPTION(ProfileInterpreter); 3637 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3638 #endif 3639 3640 #ifndef TIERED 3641 // Tiered compilation is undefined. 3642 UNSUPPORTED_OPTION(TieredCompilation); 3643 #endif 3644 3645 #if INCLUDE_JVMCI 3646 if (EnableJVMCI && 3647 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3648 return JNI_ENOMEM; 3649 } 3650 #endif 3651 3652 // If we are running in a headless jre, force java.awt.headless property 3653 // to be true unless the property has already been set. 3654 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3655 if (os::is_headless_jre()) { 3656 const char* headless = Arguments::get_property("java.awt.headless"); 3657 if (headless == NULL) { 3658 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3659 if (headless_env == NULL) { 3660 if (!add_property("java.awt.headless=true")) { 3661 return JNI_ENOMEM; 3662 } 3663 } else { 3664 char buffer[256]; 3665 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3666 if (!add_property(buffer)) { 3667 return JNI_ENOMEM; 3668 } 3669 } 3670 } 3671 } 3672 3673 if (!check_vm_args_consistency()) { 3674 return JNI_ERR; 3675 } 3676 3677 #if INCLUDE_JVMCI 3678 if (UseJVMCICompiler) { 3679 Compilation_mode = CompMode_server; 3680 } 3681 #endif 3682 3683 return JNI_OK; 3684 } 3685 3686 // Helper class for controlling the lifetime of JavaVMInitArgs 3687 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3688 // deleted on the destruction of the ScopedVMInitArgs object. 3689 class ScopedVMInitArgs : public StackObj { 3690 private: 3691 JavaVMInitArgs _args; 3692 char* _container_name; 3693 bool _is_set; 3694 char* _vm_options_file_arg; 3695 3696 public: 3697 ScopedVMInitArgs(const char *container_name) { 3698 _args.version = JNI_VERSION_1_2; 3699 _args.nOptions = 0; 3700 _args.options = NULL; 3701 _args.ignoreUnrecognized = false; 3702 _container_name = (char *)container_name; 3703 _is_set = false; 3704 _vm_options_file_arg = NULL; 3705 } 3706 3707 // Populates the JavaVMInitArgs object represented by this 3708 // ScopedVMInitArgs object with the arguments in options. The 3709 // allocated memory is deleted by the destructor. If this method 3710 // returns anything other than JNI_OK, then this object is in a 3711 // partially constructed state, and should be abandoned. 3712 jint set_args(GrowableArray<JavaVMOption>* options) { 3713 _is_set = true; 3714 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3715 JavaVMOption, options->length(), mtArguments); 3716 if (options_arr == NULL) { 3717 return JNI_ENOMEM; 3718 } 3719 _args.options = options_arr; 3720 3721 for (int i = 0; i < options->length(); i++) { 3722 options_arr[i] = options->at(i); 3723 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3724 if (options_arr[i].optionString == NULL) { 3725 // Rely on the destructor to do cleanup. 3726 _args.nOptions = i; 3727 return JNI_ENOMEM; 3728 } 3729 } 3730 3731 _args.nOptions = options->length(); 3732 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3733 return JNI_OK; 3734 } 3735 3736 JavaVMInitArgs* get() { return &_args; } 3737 char* container_name() { return _container_name; } 3738 bool is_set() { return _is_set; } 3739 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3740 char* vm_options_file_arg() { return _vm_options_file_arg; } 3741 3742 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3743 if (_vm_options_file_arg != NULL) { 3744 os::free(_vm_options_file_arg); 3745 } 3746 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3747 } 3748 3749 ~ScopedVMInitArgs() { 3750 if (_vm_options_file_arg != NULL) { 3751 os::free(_vm_options_file_arg); 3752 } 3753 if (_args.options == NULL) return; 3754 for (int i = 0; i < _args.nOptions; i++) { 3755 os::free(_args.options[i].optionString); 3756 } 3757 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3758 } 3759 3760 // Insert options into this option list, to replace option at 3761 // vm_options_file_pos (-XX:VMOptionsFile) 3762 jint insert(const JavaVMInitArgs* args, 3763 const JavaVMInitArgs* args_to_insert, 3764 const int vm_options_file_pos) { 3765 assert(_args.options == NULL, "shouldn't be set yet"); 3766 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3767 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3768 3769 int length = args->nOptions + args_to_insert->nOptions - 1; 3770 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3771 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3772 for (int i = 0; i < args->nOptions; i++) { 3773 if (i == vm_options_file_pos) { 3774 // insert the new options starting at the same place as the 3775 // -XX:VMOptionsFile option 3776 for (int j = 0; j < args_to_insert->nOptions; j++) { 3777 options->push(args_to_insert->options[j]); 3778 } 3779 } else { 3780 options->push(args->options[i]); 3781 } 3782 } 3783 // make into options array 3784 jint result = set_args(options); 3785 delete options; 3786 return result; 3787 } 3788 }; 3789 3790 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3791 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3792 } 3793 3794 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3795 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3796 } 3797 3798 jint Arguments::parse_options_environment_variable(const char* name, 3799 ScopedVMInitArgs* vm_args) { 3800 char *buffer = ::getenv(name); 3801 3802 // Don't check this environment variable if user has special privileges 3803 // (e.g. unix su command). 3804 if (buffer == NULL || os::have_special_privileges()) { 3805 return JNI_OK; 3806 } 3807 3808 if ((buffer = os::strdup(buffer)) == NULL) { 3809 return JNI_ENOMEM; 3810 } 3811 3812 jio_fprintf(defaultStream::error_stream(), 3813 "Picked up %s: %s\n", name, buffer); 3814 3815 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3816 3817 os::free(buffer); 3818 return retcode; 3819 } 3820 3821 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3822 // read file into buffer 3823 int fd = ::open(file_name, O_RDONLY); 3824 if (fd < 0) { 3825 jio_fprintf(defaultStream::error_stream(), 3826 "Could not open options file '%s'\n", 3827 file_name); 3828 return JNI_ERR; 3829 } 3830 3831 struct stat stbuf; 3832 int retcode = os::stat(file_name, &stbuf); 3833 if (retcode != 0) { 3834 jio_fprintf(defaultStream::error_stream(), 3835 "Could not stat options file '%s'\n", 3836 file_name); 3837 os::close(fd); 3838 return JNI_ERR; 3839 } 3840 3841 if (stbuf.st_size == 0) { 3842 // tell caller there is no option data and that is ok 3843 os::close(fd); 3844 return JNI_OK; 3845 } 3846 3847 // '+ 1' for NULL termination even with max bytes 3848 size_t bytes_alloc = stbuf.st_size + 1; 3849 3850 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3851 if (NULL == buf) { 3852 jio_fprintf(defaultStream::error_stream(), 3853 "Could not allocate read buffer for options file parse\n"); 3854 os::close(fd); 3855 return JNI_ENOMEM; 3856 } 3857 3858 memset(buf, 0, bytes_alloc); 3859 3860 // Fill buffer 3861 // Use ::read() instead of os::read because os::read() 3862 // might do a thread state transition 3863 // and it is too early for that here 3864 3865 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3866 os::close(fd); 3867 if (bytes_read < 0) { 3868 FREE_C_HEAP_ARRAY(char, buf); 3869 jio_fprintf(defaultStream::error_stream(), 3870 "Could not read options file '%s'\n", file_name); 3871 return JNI_ERR; 3872 } 3873 3874 if (bytes_read == 0) { 3875 // tell caller there is no option data and that is ok 3876 FREE_C_HEAP_ARRAY(char, buf); 3877 return JNI_OK; 3878 } 3879 3880 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3881 3882 FREE_C_HEAP_ARRAY(char, buf); 3883 return retcode; 3884 } 3885 3886 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3887 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3888 3889 // some pointers to help with parsing 3890 char *buffer_end = buffer + buf_len; 3891 char *opt_hd = buffer; 3892 char *wrt = buffer; 3893 char *rd = buffer; 3894 3895 // parse all options 3896 while (rd < buffer_end) { 3897 // skip leading white space from the input string 3898 while (rd < buffer_end && isspace(*rd)) { 3899 rd++; 3900 } 3901 3902 if (rd >= buffer_end) { 3903 break; 3904 } 3905 3906 // Remember this is where we found the head of the token. 3907 opt_hd = wrt; 3908 3909 // Tokens are strings of non white space characters separated 3910 // by one or more white spaces. 3911 while (rd < buffer_end && !isspace(*rd)) { 3912 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3913 int quote = *rd; // matching quote to look for 3914 rd++; // don't copy open quote 3915 while (rd < buffer_end && *rd != quote) { 3916 // include everything (even spaces) 3917 // up until the close quote 3918 *wrt++ = *rd++; // copy to option string 3919 } 3920 3921 if (rd < buffer_end) { 3922 rd++; // don't copy close quote 3923 } else { 3924 // did not see closing quote 3925 jio_fprintf(defaultStream::error_stream(), 3926 "Unmatched quote in %s\n", name); 3927 delete options; 3928 return JNI_ERR; 3929 } 3930 } else { 3931 *wrt++ = *rd++; // copy to option string 3932 } 3933 } 3934 3935 // steal a white space character and set it to NULL 3936 *wrt++ = '\0'; 3937 // We now have a complete token 3938 3939 JavaVMOption option; 3940 option.optionString = opt_hd; 3941 option.extraInfo = NULL; 3942 3943 options->append(option); // Fill in option 3944 3945 rd++; // Advance to next character 3946 } 3947 3948 // Fill out JavaVMInitArgs structure. 3949 jint status = vm_args->set_args(options); 3950 3951 delete options; 3952 return status; 3953 } 3954 3955 void Arguments::set_shared_spaces_flags() { 3956 if (DumpSharedSpaces) { 3957 if (FailOverToOldVerifier) { 3958 // Don't fall back to the old verifier on verification failure. If a 3959 // class fails verification with the split verifier, it might fail the 3960 // CDS runtime verifier constraint check. In that case, we don't want 3961 // to share the class. We only archive classes that pass the split verifier. 3962 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3963 } 3964 3965 if (RequireSharedSpaces) { 3966 warning("Cannot dump shared archive while using shared archive"); 3967 } 3968 UseSharedSpaces = false; 3969 #ifdef _LP64 3970 if (!UseCompressedOops || !UseCompressedClassPointers) { 3971 vm_exit_during_initialization( 3972 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3973 } 3974 } else { 3975 if (!UseCompressedOops || !UseCompressedClassPointers) { 3976 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3977 } 3978 #endif 3979 } 3980 } 3981 3982 // Sharing support 3983 // Construct the path to the archive 3984 static char* get_shared_archive_path() { 3985 char *shared_archive_path; 3986 if (SharedArchiveFile == NULL) { 3987 char jvm_path[JVM_MAXPATHLEN]; 3988 os::jvm_path(jvm_path, sizeof(jvm_path)); 3989 char *end = strrchr(jvm_path, *os::file_separator()); 3990 if (end != NULL) *end = '\0'; 3991 size_t jvm_path_len = strlen(jvm_path); 3992 size_t file_sep_len = strlen(os::file_separator()); 3993 const size_t len = jvm_path_len + file_sep_len + 20; 3994 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3995 if (shared_archive_path != NULL) { 3996 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3997 jvm_path, os::file_separator()); 3998 } 3999 } else { 4000 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 4001 } 4002 return shared_archive_path; 4003 } 4004 4005 #ifndef PRODUCT 4006 // Determine whether LogVMOutput should be implicitly turned on. 4007 static bool use_vm_log() { 4008 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4009 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4010 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4011 PrintAssembly || TraceDeoptimization || TraceDependencies || 4012 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4013 return true; 4014 } 4015 4016 #ifdef COMPILER1 4017 if (PrintC1Statistics) { 4018 return true; 4019 } 4020 #endif // COMPILER1 4021 4022 #ifdef COMPILER2 4023 if (PrintOptoAssembly || PrintOptoStatistics) { 4024 return true; 4025 } 4026 #endif // COMPILER2 4027 4028 return false; 4029 } 4030 4031 #endif // PRODUCT 4032 4033 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4034 for (int index = 0; index < args->nOptions; index++) { 4035 const JavaVMOption* option = args->options + index; 4036 const char* tail; 4037 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4038 return true; 4039 } 4040 } 4041 return false; 4042 } 4043 4044 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4045 const char* vm_options_file, 4046 const int vm_options_file_pos, 4047 ScopedVMInitArgs* vm_options_file_args, 4048 ScopedVMInitArgs* args_out) { 4049 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4050 if (code != JNI_OK) { 4051 return code; 4052 } 4053 4054 if (vm_options_file_args->get()->nOptions < 1) { 4055 return JNI_OK; 4056 } 4057 4058 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4059 jio_fprintf(defaultStream::error_stream(), 4060 "A VM options file may not refer to a VM options file. " 4061 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4062 "options file '%s' in options container '%s' is an error.\n", 4063 vm_options_file_args->vm_options_file_arg(), 4064 vm_options_file_args->container_name()); 4065 return JNI_EINVAL; 4066 } 4067 4068 return args_out->insert(args, vm_options_file_args->get(), 4069 vm_options_file_pos); 4070 } 4071 4072 // Expand -XX:VMOptionsFile found in args_in as needed. 4073 // mod_args and args_out parameters may return values as needed. 4074 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4075 ScopedVMInitArgs* mod_args, 4076 JavaVMInitArgs** args_out) { 4077 jint code = match_special_option_and_act(args_in, mod_args); 4078 if (code != JNI_OK) { 4079 return code; 4080 } 4081 4082 if (mod_args->is_set()) { 4083 // args_in contains -XX:VMOptionsFile and mod_args contains the 4084 // original options from args_in along with the options expanded 4085 // from the VMOptionsFile. Return a short-hand to the caller. 4086 *args_out = mod_args->get(); 4087 } else { 4088 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4089 } 4090 return JNI_OK; 4091 } 4092 4093 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4094 ScopedVMInitArgs* args_out) { 4095 // Remaining part of option string 4096 const char* tail; 4097 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4098 4099 for (int index = 0; index < args->nOptions; index++) { 4100 const JavaVMOption* option = args->options + index; 4101 if (ArgumentsExt::process_options(option)) { 4102 continue; 4103 } 4104 if (match_option(option, "-XX:Flags=", &tail)) { 4105 Arguments::set_jvm_flags_file(tail); 4106 continue; 4107 } 4108 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4109 if (vm_options_file_args.found_vm_options_file_arg()) { 4110 jio_fprintf(defaultStream::error_stream(), 4111 "The option '%s' is already specified in the options " 4112 "container '%s' so the specification of '%s' in the " 4113 "same options container is an error.\n", 4114 vm_options_file_args.vm_options_file_arg(), 4115 vm_options_file_args.container_name(), 4116 option->optionString); 4117 return JNI_EINVAL; 4118 } 4119 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4120 // If there's a VMOptionsFile, parse that 4121 jint code = insert_vm_options_file(args, tail, index, 4122 &vm_options_file_args, args_out); 4123 if (code != JNI_OK) { 4124 return code; 4125 } 4126 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4127 if (args_out->is_set()) { 4128 // The VMOptions file inserted some options so switch 'args' 4129 // to the new set of options, and continue processing which 4130 // preserves "last option wins" semantics. 4131 args = args_out->get(); 4132 // The first option from the VMOptionsFile replaces the 4133 // current option. So we back track to process the 4134 // replacement option. 4135 index--; 4136 } 4137 continue; 4138 } 4139 if (match_option(option, "-XX:+PrintVMOptions")) { 4140 PrintVMOptions = true; 4141 continue; 4142 } 4143 if (match_option(option, "-XX:-PrintVMOptions")) { 4144 PrintVMOptions = false; 4145 continue; 4146 } 4147 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4148 IgnoreUnrecognizedVMOptions = true; 4149 continue; 4150 } 4151 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4152 IgnoreUnrecognizedVMOptions = false; 4153 continue; 4154 } 4155 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4156 CommandLineFlags::printFlags(tty, false); 4157 vm_exit(0); 4158 } 4159 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4160 #if INCLUDE_NMT 4161 // The launcher did not setup nmt environment variable properly. 4162 if (!MemTracker::check_launcher_nmt_support(tail)) { 4163 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4164 } 4165 4166 // Verify if nmt option is valid. 4167 if (MemTracker::verify_nmt_option()) { 4168 // Late initialization, still in single-threaded mode. 4169 if (MemTracker::tracking_level() >= NMT_summary) { 4170 MemTracker::init(); 4171 } 4172 } else { 4173 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4174 } 4175 continue; 4176 #else 4177 jio_fprintf(defaultStream::error_stream(), 4178 "Native Memory Tracking is not supported in this VM\n"); 4179 return JNI_ERR; 4180 #endif 4181 } 4182 4183 #ifndef PRODUCT 4184 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4185 CommandLineFlags::printFlags(tty, true); 4186 vm_exit(0); 4187 } 4188 #endif 4189 } 4190 return JNI_OK; 4191 } 4192 4193 static void print_options(const JavaVMInitArgs *args) { 4194 const char* tail; 4195 for (int index = 0; index < args->nOptions; index++) { 4196 const JavaVMOption *option = args->options + index; 4197 if (match_option(option, "-XX:", &tail)) { 4198 logOption(tail); 4199 } 4200 } 4201 } 4202 4203 bool Arguments::handle_deprecated_print_gc_flags() { 4204 if (PrintGC) { 4205 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4206 } 4207 if (PrintGCDetails) { 4208 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4209 } 4210 4211 if (_gc_log_filename != NULL) { 4212 // -Xloggc was used to specify a filename 4213 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4214 4215 LogTarget(Error, logging) target; 4216 LogStreamCHeap errstream(target); 4217 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4218 } else if (PrintGC || PrintGCDetails) { 4219 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4220 } 4221 return true; 4222 } 4223 4224 void Arguments::handle_extra_cms_flags(const char* msg) { 4225 SpecialFlag flag; 4226 const char *flag_name = "UseConcMarkSweepGC"; 4227 if (lookup_special_flag(flag_name, flag)) { 4228 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4229 warning("%s", msg); 4230 } 4231 } 4232 4233 // Parse entry point called from JNI_CreateJavaVM 4234 4235 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4236 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4237 4238 // Initialize ranges, constraints and writeables 4239 CommandLineFlagRangeList::init(); 4240 CommandLineFlagConstraintList::init(); 4241 CommandLineFlagWriteableList::init(); 4242 4243 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4244 const char* hotspotrc = ".hotspotrc"; 4245 bool settings_file_specified = false; 4246 bool needs_hotspotrc_warning = false; 4247 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4248 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4249 4250 // Pointers to current working set of containers 4251 JavaVMInitArgs* cur_cmd_args; 4252 JavaVMInitArgs* cur_java_options_args; 4253 JavaVMInitArgs* cur_java_tool_options_args; 4254 4255 // Containers for modified/expanded options 4256 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4257 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4258 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4259 4260 4261 jint code = 4262 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4263 if (code != JNI_OK) { 4264 return code; 4265 } 4266 4267 code = parse_java_options_environment_variable(&initial_java_options_args); 4268 if (code != JNI_OK) { 4269 return code; 4270 } 4271 4272 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4273 &mod_java_tool_options_args, 4274 &cur_java_tool_options_args); 4275 if (code != JNI_OK) { 4276 return code; 4277 } 4278 4279 code = expand_vm_options_as_needed(initial_cmd_args, 4280 &mod_cmd_args, 4281 &cur_cmd_args); 4282 if (code != JNI_OK) { 4283 return code; 4284 } 4285 4286 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4287 &mod_java_options_args, 4288 &cur_java_options_args); 4289 if (code != JNI_OK) { 4290 return code; 4291 } 4292 4293 const char* flags_file = Arguments::get_jvm_flags_file(); 4294 settings_file_specified = (flags_file != NULL); 4295 4296 if (IgnoreUnrecognizedVMOptions) { 4297 cur_cmd_args->ignoreUnrecognized = true; 4298 cur_java_tool_options_args->ignoreUnrecognized = true; 4299 cur_java_options_args->ignoreUnrecognized = true; 4300 } 4301 4302 // Parse specified settings file 4303 if (settings_file_specified) { 4304 if (!process_settings_file(flags_file, true, 4305 cur_cmd_args->ignoreUnrecognized)) { 4306 return JNI_EINVAL; 4307 } 4308 } else { 4309 #ifdef ASSERT 4310 // Parse default .hotspotrc settings file 4311 if (!process_settings_file(".hotspotrc", false, 4312 cur_cmd_args->ignoreUnrecognized)) { 4313 return JNI_EINVAL; 4314 } 4315 #else 4316 struct stat buf; 4317 if (os::stat(hotspotrc, &buf) == 0) { 4318 needs_hotspotrc_warning = true; 4319 } 4320 #endif 4321 } 4322 4323 if (PrintVMOptions) { 4324 print_options(cur_java_tool_options_args); 4325 print_options(cur_cmd_args); 4326 print_options(cur_java_options_args); 4327 } 4328 4329 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4330 jint result = parse_vm_init_args(cur_java_tool_options_args, 4331 cur_java_options_args, 4332 cur_cmd_args); 4333 4334 if (result != JNI_OK) { 4335 return result; 4336 } 4337 4338 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4339 SharedArchivePath = get_shared_archive_path(); 4340 if (SharedArchivePath == NULL) { 4341 return JNI_ENOMEM; 4342 } 4343 4344 // Set up VerifySharedSpaces 4345 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4346 VerifySharedSpaces = true; 4347 } 4348 4349 // Delay warning until here so that we've had a chance to process 4350 // the -XX:-PrintWarnings flag 4351 if (needs_hotspotrc_warning) { 4352 warning("%s file is present but has been ignored. " 4353 "Run with -XX:Flags=%s to load the file.", 4354 hotspotrc, hotspotrc); 4355 } 4356 4357 if (needs_module_property_warning) { 4358 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4359 " names that are reserved for internal use."); 4360 } 4361 4362 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4363 UNSUPPORTED_OPTION(UseLargePages); 4364 #endif 4365 4366 ArgumentsExt::report_unsupported_options(); 4367 4368 #ifndef PRODUCT 4369 if (TraceBytecodesAt != 0) { 4370 TraceBytecodes = true; 4371 } 4372 if (CountCompiledCalls) { 4373 if (UseCounterDecay) { 4374 warning("UseCounterDecay disabled because CountCalls is set"); 4375 UseCounterDecay = false; 4376 } 4377 } 4378 #endif // PRODUCT 4379 4380 if (ScavengeRootsInCode == 0) { 4381 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4382 warning("Forcing ScavengeRootsInCode non-zero"); 4383 } 4384 ScavengeRootsInCode = 1; 4385 } 4386 4387 if (!handle_deprecated_print_gc_flags()) { 4388 return JNI_EINVAL; 4389 } 4390 4391 // Set object alignment values. 4392 set_object_alignment(); 4393 4394 #if !INCLUDE_CDS 4395 if (DumpSharedSpaces || RequireSharedSpaces) { 4396 jio_fprintf(defaultStream::error_stream(), 4397 "Shared spaces are not supported in this VM\n"); 4398 return JNI_ERR; 4399 } 4400 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4401 warning("Shared spaces are not supported in this VM"); 4402 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4403 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4404 } 4405 no_shared_spaces("CDS Disabled"); 4406 #endif // INCLUDE_CDS 4407 4408 return JNI_OK; 4409 } 4410 4411 jint Arguments::apply_ergo() { 4412 // Set flags based on ergonomics. 4413 set_ergonomics_flags(); 4414 4415 #if INCLUDE_JVMCI 4416 set_jvmci_specific_flags(); 4417 #endif 4418 4419 set_shared_spaces_flags(); 4420 4421 // Check the GC selections again. 4422 if (!check_gc_consistency()) { 4423 return JNI_EINVAL; 4424 } 4425 4426 if (TieredCompilation) { 4427 set_tiered_flags(); 4428 } else { 4429 int max_compilation_policy_choice = 1; 4430 #ifdef COMPILER2 4431 if (is_server_compilation_mode_vm()) { 4432 max_compilation_policy_choice = 2; 4433 } 4434 #endif 4435 // Check if the policy is valid. 4436 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4437 vm_exit_during_initialization( 4438 "Incompatible compilation policy selected", NULL); 4439 } 4440 // Scale CompileThreshold 4441 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4442 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4443 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4444 } 4445 } 4446 4447 #ifdef COMPILER2 4448 #ifndef PRODUCT 4449 if (PrintIdealGraphLevel > 0) { 4450 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4451 } 4452 #endif 4453 #endif 4454 4455 // Set heap size based on available physical memory 4456 set_heap_size(); 4457 4458 ArgumentsExt::set_gc_specific_flags(); 4459 4460 // Initialize Metaspace flags and alignments 4461 Metaspace::ergo_initialize(); 4462 4463 // Set bytecode rewriting flags 4464 set_bytecode_flags(); 4465 4466 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4467 jint code = set_aggressive_opts_flags(); 4468 if (code != JNI_OK) { 4469 return code; 4470 } 4471 4472 // Turn off biased locking for locking debug mode flags, 4473 // which are subtly different from each other but neither works with 4474 // biased locking 4475 if (UseHeavyMonitors 4476 #ifdef COMPILER1 4477 || !UseFastLocking 4478 #endif // COMPILER1 4479 #if INCLUDE_JVMCI 4480 || !JVMCIUseFastLocking 4481 #endif 4482 ) { 4483 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4484 // flag set to true on command line; warn the user that they 4485 // can't enable biased locking here 4486 warning("Biased Locking is not supported with locking debug flags" 4487 "; ignoring UseBiasedLocking flag." ); 4488 } 4489 UseBiasedLocking = false; 4490 } 4491 4492 #ifdef CC_INTERP 4493 // Clear flags not supported on zero. 4494 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4495 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4496 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4497 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4498 #endif // CC_INTERP 4499 4500 #ifdef COMPILER2 4501 if (!EliminateLocks) { 4502 EliminateNestedLocks = false; 4503 } 4504 if (!Inline) { 4505 IncrementalInline = false; 4506 } 4507 #ifndef PRODUCT 4508 if (!IncrementalInline) { 4509 AlwaysIncrementalInline = false; 4510 } 4511 #endif 4512 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4513 // nothing to use the profiling, turn if off 4514 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4515 } 4516 #endif 4517 4518 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4519 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4520 DebugNonSafepoints = true; 4521 } 4522 4523 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4524 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4525 } 4526 4527 if (UseOnStackReplacement && !UseLoopCounter) { 4528 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4529 FLAG_SET_DEFAULT(UseLoopCounter, true); 4530 } 4531 4532 #ifndef PRODUCT 4533 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4534 if (use_vm_log()) { 4535 LogVMOutput = true; 4536 } 4537 } 4538 #endif // PRODUCT 4539 4540 if (PrintCommandLineFlags) { 4541 CommandLineFlags::printSetFlags(tty); 4542 } 4543 4544 // Apply CPU specific policy for the BiasedLocking 4545 if (UseBiasedLocking) { 4546 if (!VM_Version::use_biased_locking() && 4547 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4548 UseBiasedLocking = false; 4549 } 4550 } 4551 #ifdef COMPILER2 4552 if (!UseBiasedLocking || EmitSync != 0) { 4553 UseOptoBiasInlining = false; 4554 } 4555 #endif 4556 4557 return JNI_OK; 4558 } 4559 4560 jint Arguments::adjust_after_os() { 4561 if (UseNUMA) { 4562 if (UseParallelGC || UseParallelOldGC) { 4563 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4564 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4565 } 4566 } 4567 // UseNUMAInterleaving is set to ON for all collectors and 4568 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4569 // such as the parallel collector for Linux and Solaris will 4570 // interleave old gen and survivor spaces on top of NUMA 4571 // allocation policy for the eden space. 4572 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4573 // all platforms and ParallelGC on Windows will interleave all 4574 // of the heap spaces across NUMA nodes. 4575 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4576 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4577 } 4578 } 4579 return JNI_OK; 4580 } 4581 4582 int Arguments::PropertyList_count(SystemProperty* pl) { 4583 int count = 0; 4584 while(pl != NULL) { 4585 count++; 4586 pl = pl->next(); 4587 } 4588 return count; 4589 } 4590 4591 // Return the number of readable properties. 4592 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4593 int count = 0; 4594 while(pl != NULL) { 4595 if (pl->is_readable()) { 4596 count++; 4597 } 4598 pl = pl->next(); 4599 } 4600 return count; 4601 } 4602 4603 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4604 assert(key != NULL, "just checking"); 4605 SystemProperty* prop; 4606 for (prop = pl; prop != NULL; prop = prop->next()) { 4607 if (strcmp(key, prop->key()) == 0) return prop->value(); 4608 } 4609 return NULL; 4610 } 4611 4612 // Return the value of the requested property provided that it is a readable property. 4613 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4614 assert(key != NULL, "just checking"); 4615 SystemProperty* prop; 4616 // Return the property value if the keys match and the property is not internal or 4617 // it's the special internal property "jdk.boot.class.path.append". 4618 for (prop = pl; prop != NULL; prop = prop->next()) { 4619 if (strcmp(key, prop->key()) == 0) { 4620 if (!prop->internal()) { 4621 return prop->value(); 4622 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4623 return prop->value(); 4624 } else { 4625 // Property is internal and not jdk.boot.class.path.append so return NULL. 4626 return NULL; 4627 } 4628 } 4629 } 4630 return NULL; 4631 } 4632 4633 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4634 int count = 0; 4635 const char* ret_val = NULL; 4636 4637 while(pl != NULL) { 4638 if(count >= index) { 4639 ret_val = pl->key(); 4640 break; 4641 } 4642 count++; 4643 pl = pl->next(); 4644 } 4645 4646 return ret_val; 4647 } 4648 4649 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4650 int count = 0; 4651 char* ret_val = NULL; 4652 4653 while(pl != NULL) { 4654 if(count >= index) { 4655 ret_val = pl->value(); 4656 break; 4657 } 4658 count++; 4659 pl = pl->next(); 4660 } 4661 4662 return ret_val; 4663 } 4664 4665 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4666 SystemProperty* p = *plist; 4667 if (p == NULL) { 4668 *plist = new_p; 4669 } else { 4670 while (p->next() != NULL) { 4671 p = p->next(); 4672 } 4673 p->set_next(new_p); 4674 } 4675 } 4676 4677 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4678 bool writeable, bool internal) { 4679 if (plist == NULL) 4680 return; 4681 4682 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4683 PropertyList_add(plist, new_p); 4684 } 4685 4686 void Arguments::PropertyList_add(SystemProperty *element) { 4687 PropertyList_add(&_system_properties, element); 4688 } 4689 4690 // This add maintains unique property key in the list. 4691 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4692 PropertyAppendable append, PropertyWriteable writeable, 4693 PropertyInternal internal) { 4694 if (plist == NULL) 4695 return; 4696 4697 // If property key exist then update with new value. 4698 SystemProperty* prop; 4699 for (prop = *plist; prop != NULL; prop = prop->next()) { 4700 if (strcmp(k, prop->key()) == 0) { 4701 if (append == AppendProperty) { 4702 prop->append_value(v); 4703 } else { 4704 prop->set_value(v); 4705 } 4706 return; 4707 } 4708 } 4709 4710 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4711 } 4712 4713 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4714 // Returns true if all of the source pointed by src has been copied over to 4715 // the destination buffer pointed by buf. Otherwise, returns false. 4716 // Notes: 4717 // 1. If the length (buflen) of the destination buffer excluding the 4718 // NULL terminator character is not long enough for holding the expanded 4719 // pid characters, it also returns false instead of returning the partially 4720 // expanded one. 4721 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4722 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4723 char* buf, size_t buflen) { 4724 const char* p = src; 4725 char* b = buf; 4726 const char* src_end = &src[srclen]; 4727 char* buf_end = &buf[buflen - 1]; 4728 4729 while (p < src_end && b < buf_end) { 4730 if (*p == '%') { 4731 switch (*(++p)) { 4732 case '%': // "%%" ==> "%" 4733 *b++ = *p++; 4734 break; 4735 case 'p': { // "%p" ==> current process id 4736 // buf_end points to the character before the last character so 4737 // that we could write '\0' to the end of the buffer. 4738 size_t buf_sz = buf_end - b + 1; 4739 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4740 4741 // if jio_snprintf fails or the buffer is not long enough to hold 4742 // the expanded pid, returns false. 4743 if (ret < 0 || ret >= (int)buf_sz) { 4744 return false; 4745 } else { 4746 b += ret; 4747 assert(*b == '\0', "fail in copy_expand_pid"); 4748 if (p == src_end && b == buf_end + 1) { 4749 // reach the end of the buffer. 4750 return true; 4751 } 4752 } 4753 p++; 4754 break; 4755 } 4756 default : 4757 *b++ = '%'; 4758 } 4759 } else { 4760 *b++ = *p++; 4761 } 4762 } 4763 *b = '\0'; 4764 return (p == src_end); // return false if not all of the source was copied 4765 }