1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/moduleEntry.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genCollectedHeap.hpp" 33 #include "gc/shared/referenceProcessor.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/arguments_ext.hpp" 45 #include "runtime/commandLineFlagConstraintList.hpp" 46 #include "runtime/commandLineFlagWriteableList.hpp" 47 #include "runtime/commandLineFlagRangeList.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/globals_extension.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/defaultStream.hpp" 56 #include "utilities/macros.hpp" 57 #include "utilities/stringUtils.hpp" 58 #if INCLUDE_JVMCI 59 #include "jvmci/jvmciRuntime.hpp" 60 #endif 61 #if INCLUDE_ALL_GCS 62 #include "gc/cms/compactibleFreeListSpace.hpp" 63 #include "gc/g1/g1CollectedHeap.inline.hpp" 64 #include "gc/parallel/parallelScavengeHeap.hpp" 65 #endif // INCLUDE_ALL_GCS 66 67 // Note: This is a special bug reporting site for the JVM 68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 bool Arguments::_has_profile = false; 80 size_t Arguments::_conservative_max_heap_alignment = 0; 81 size_t Arguments::_min_heap_size = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args() 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98 char* Arguments::SharedArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 abort_hook_t Arguments::_abort_hook = NULL; 104 exit_hook_t Arguments::_exit_hook = NULL; 105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108 SystemProperty *Arguments::_sun_boot_library_path = NULL; 109 SystemProperty *Arguments::_java_library_path = NULL; 110 SystemProperty *Arguments::_java_home = NULL; 111 SystemProperty *Arguments::_java_class_path = NULL; 112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 113 114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 115 PathString *Arguments::_system_boot_class_path = NULL; 116 bool Arguments::_has_jimage = false; 117 118 char* Arguments::_ext_dirs = NULL; 119 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 121 // part of the option string. 122 static bool match_option(const JavaVMOption *option, const char* name, 123 const char** tail) { 124 size_t len = strlen(name); 125 if (strncmp(option->optionString, name, len) == 0) { 126 *tail = option->optionString + len; 127 return true; 128 } else { 129 return false; 130 } 131 } 132 133 // Check if 'option' matches 'name'. No "tail" is allowed. 134 static bool match_option(const JavaVMOption *option, const char* name) { 135 const char* tail = NULL; 136 bool result = match_option(option, name, &tail); 137 if (tail != NULL && *tail == '\0') { 138 return result; 139 } else { 140 return false; 141 } 142 } 143 144 // Return true if any of the strings in null-terminated array 'names' matches. 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 146 // the option must match exactly. 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 148 bool tail_allowed) { 149 for (/* empty */; *names != NULL; ++names) { 150 if (match_option(option, *names, tail)) { 151 if (**tail == '\0' || tail_allowed && **tail == ':') { 152 return true; 153 } 154 } 155 } 156 return false; 157 } 158 159 static void logOption(const char* opt) { 160 if (PrintVMOptions) { 161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 162 } 163 } 164 165 bool needs_module_property_warning = false; 166 167 #define MODULE_PROPERTY_PREFIX "jdk.module." 168 #define MODULE_PROPERTY_PREFIX_LEN 11 169 #define ADDEXPORTS "addexports" 170 #define ADDEXPORTS_LEN 10 171 #define ADDREADS "addreads" 172 #define ADDREADS_LEN 8 173 #define ADDOPENS "addopens" 174 #define ADDOPENS_LEN 8 175 #define PATCH "patch" 176 #define PATCH_LEN 5 177 #define ADDMODS "addmods" 178 #define ADDMODS_LEN 7 179 #define LIMITMODS "limitmods" 180 #define LIMITMODS_LEN 9 181 #define PATH "path" 182 #define PATH_LEN 4 183 #define UPGRADE_PATH "upgrade.path" 184 #define UPGRADE_PATH_LEN 12 185 186 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 187 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 188 return ((strncmp(option, property, len) == 0) && 189 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 190 } 191 192 // Return true if property starts with "jdk.module." and its ensuing chars match 193 // any of the reserved module properties. 194 // property should be passed without the leading "-D". 195 bool Arguments::is_internal_module_property(const char* property) { 196 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 197 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 198 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 199 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 200 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 201 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 202 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 203 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 204 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 205 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 206 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 207 return true; 208 } 209 } 210 return false; 211 } 212 213 // Process java launcher properties. 214 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 215 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 216 // sun.java.launcher.pid is defined. 217 // Must do this before setting up other system properties, 218 // as some of them may depend on launcher type. 219 for (int index = 0; index < args->nOptions; index++) { 220 const JavaVMOption* option = args->options + index; 221 const char* tail; 222 223 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 224 process_java_launcher_argument(tail, option->extraInfo); 225 continue; 226 } 227 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 228 if (strcmp(tail, "true") == 0) { 229 _sun_java_launcher_is_altjvm = true; 230 } 231 continue; 232 } 233 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 234 _sun_java_launcher_pid = atoi(tail); 235 continue; 236 } 237 } 238 } 239 240 // Initialize system properties key and value. 241 void Arguments::init_system_properties() { 242 243 // Set up _system_boot_class_path which is not a property but 244 // relies heavily on argument processing and the jdk.boot.class.path.append 245 // property. It is used to store the underlying system boot class path. 246 _system_boot_class_path = new PathString(NULL); 247 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 249 "Java Virtual Machine Specification", false)); 250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 253 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 254 255 // Following are JVMTI agent writable properties. 256 // Properties values are set to NULL and they are 257 // os specific they are initialized in os::init_system_properties_values(). 258 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 259 _java_library_path = new SystemProperty("java.library.path", NULL, true); 260 _java_home = new SystemProperty("java.home", NULL, true); 261 _java_class_path = new SystemProperty("java.class.path", "", true); 262 // jdk.boot.class.path.append is a non-writeable, internal property. 263 // It can only be set by either: 264 // - -Xbootclasspath/a: 265 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 266 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 267 268 // Add to System Property list. 269 PropertyList_add(&_system_properties, _sun_boot_library_path); 270 PropertyList_add(&_system_properties, _java_library_path); 271 PropertyList_add(&_system_properties, _java_home); 272 PropertyList_add(&_system_properties, _java_class_path); 273 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 274 275 // Set OS specific system properties values 276 os::init_system_properties_values(); 277 } 278 279 // Update/Initialize System properties after JDK version number is known 280 void Arguments::init_version_specific_system_properties() { 281 enum { bufsz = 16 }; 282 char buffer[bufsz]; 283 const char* spec_vendor = "Oracle Corporation"; 284 uint32_t spec_version = JDK_Version::current().major_version(); 285 286 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 287 288 PropertyList_add(&_system_properties, 289 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 290 PropertyList_add(&_system_properties, 291 new SystemProperty("java.vm.specification.version", buffer, false)); 292 PropertyList_add(&_system_properties, 293 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 294 } 295 296 /* 297 * -XX argument processing: 298 * 299 * -XX arguments are defined in several places, such as: 300 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 301 * -XX arguments are parsed in parse_argument(). 302 * -XX argument bounds checking is done in check_vm_args_consistency(). 303 * 304 * Over time -XX arguments may change. There are mechanisms to handle common cases: 305 * 306 * ALIASED: An option that is simply another name for another option. This is often 307 * part of the process of deprecating a flag, but not all aliases need 308 * to be deprecated. 309 * 310 * Create an alias for an option by adding the old and new option names to the 311 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 312 * 313 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 314 * support may be removed in the future. Both regular and aliased options may be 315 * deprecated. 316 * 317 * Add a deprecation warning for an option (or alias) by adding an entry in the 318 * "special_jvm_flags" table and setting the "deprecated_in" field. 319 * Often an option "deprecated" in one major release will 320 * be made "obsolete" in the next. In this case the entry should also have it's 321 * "obsolete_in" field set. 322 * 323 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 324 * on the command line. A warning is printed to let the user know that option might not 325 * be accepted in the future. 326 * 327 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 328 * table and setting the "obsolete_in" field. 329 * 330 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 331 * to the current JDK version. The system will flatly refuse to admit the existence of 332 * the flag. This allows a flag to die automatically over JDK releases. 333 * 334 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 335 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 336 * - Newly obsolete or expired deprecated options should have their global variable 337 * definitions removed (from globals.hpp, etc) and related implementations removed. 338 * 339 * Recommended approach for removing options: 340 * 341 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 342 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 343 * 344 * To remove internal options (e.g. diagnostic, experimental, develop options), use 345 * a 2-step model adding major release numbers to the obsolete and expire columns. 346 * 347 * To change the name of an option, use the alias table as well as a 2-step 348 * model adding major release numbers to the deprecate and expire columns. 349 * Think twice about aliasing commonly used customer options. 350 * 351 * There are times when it is appropriate to leave a future release number as undefined. 352 * 353 * Tests: Aliases should be tested in VMAliasOptions.java. 354 * Deprecated options should be tested in VMDeprecatedOptions.java. 355 */ 356 357 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 358 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 359 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 360 // the command-line as usual, but will issue a warning. 361 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 362 // the command-line, while issuing a warning and ignoring the flag value. 363 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 364 // existence of the flag. 365 // 366 // MANUAL CLEANUP ON JDK VERSION UPDATES: 367 // This table ensures that the handling of options will update automatically when the JDK 368 // version is incremented, but the source code needs to be cleanup up manually: 369 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 370 // variable should be removed, as well as users of the variable. 371 // - As "deprecated" options age into "obsolete" options, move the entry into the 372 // "Obsolete Flags" section of the table. 373 // - All expired options should be removed from the table. 374 static SpecialFlag const special_jvm_flags[] = { 375 // -------------- Deprecated Flags -------------- 376 // --- Non-alias flags - sorted by obsolete_in then expired_in: 377 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 378 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 379 380 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 381 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 382 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 383 384 // -------------- Obsolete Flags - sorted by expired_in -------------- 385 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 386 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 387 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 388 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 389 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 390 391 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 392 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 393 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 394 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 395 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 396 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 397 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 398 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 399 #endif 400 401 { NULL, JDK_Version(0), JDK_Version(0) } 402 }; 403 404 // Flags that are aliases for other flags. 405 typedef struct { 406 const char* alias_name; 407 const char* real_name; 408 } AliasedFlag; 409 410 static AliasedFlag const aliased_jvm_flags[] = { 411 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 412 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 413 { NULL, NULL} 414 }; 415 416 // NOTE: A compatibility request will be necessary for each alias to be removed. 417 static AliasedLoggingFlag const aliased_logging_flags[] = { 418 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 419 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 420 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 421 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 422 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 423 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 424 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 425 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 426 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 427 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 428 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 429 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 430 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 431 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 432 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 433 }; 434 435 #ifndef PRODUCT 436 // These options are removed in jdk9. Remove this code for jdk10. 437 static AliasedFlag const removed_develop_logging_flags[] = { 438 { "TraceClassInitialization", "-Xlog:class+init" }, 439 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 440 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 441 { "TraceItables", "-Xlog:itables=debug" }, 442 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 443 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 444 { "TraceStartupTime", "-Xlog:startuptime" }, 445 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 446 { "PrintVtables", "-Xlog:vtables=debug" }, 447 { "VerboseVerification", "-Xlog:verification" }, 448 { NULL, NULL } 449 }; 450 #endif //PRODUCT 451 452 // Return true if "v" is less than "other", where "other" may be "undefined". 453 static bool version_less_than(JDK_Version v, JDK_Version other) { 454 assert(!v.is_undefined(), "must be defined"); 455 if (!other.is_undefined() && v.compare(other) >= 0) { 456 return false; 457 } else { 458 return true; 459 } 460 } 461 462 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 463 464 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 465 // Allow extensions to have priority 466 if (lookup_special_flag_ext(flag_name, flag)) { 467 return true; 468 } 469 470 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 471 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 472 flag = special_jvm_flags[i]; 473 return true; 474 } 475 } 476 return false; 477 } 478 479 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 480 assert(version != NULL, "Must provide a version buffer"); 481 SpecialFlag flag; 482 if (lookup_special_flag(flag_name, flag)) { 483 if (!flag.obsolete_in.is_undefined()) { 484 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 485 *version = flag.obsolete_in; 486 return true; 487 } 488 } 489 } 490 return false; 491 } 492 493 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 494 assert(version != NULL, "Must provide a version buffer"); 495 SpecialFlag flag; 496 if (lookup_special_flag(flag_name, flag)) { 497 if (!flag.deprecated_in.is_undefined()) { 498 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 499 version_less_than(JDK_Version::current(), flag.expired_in)) { 500 *version = flag.deprecated_in; 501 return 1; 502 } else { 503 return -1; 504 } 505 } 506 } 507 return 0; 508 } 509 510 #ifndef PRODUCT 511 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 512 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 513 const AliasedFlag& flag = removed_develop_logging_flags[i]; 514 if (strcmp(flag.alias_name, name) == 0) { 515 return flag.real_name; 516 } 517 } 518 return NULL; 519 } 520 #endif // PRODUCT 521 522 const char* Arguments::real_flag_name(const char *flag_name) { 523 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 524 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 525 if (strcmp(flag_status.alias_name, flag_name) == 0) { 526 return flag_status.real_name; 527 } 528 } 529 return flag_name; 530 } 531 532 #ifdef ASSERT 533 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 534 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 535 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 536 return true; 537 } 538 } 539 return false; 540 } 541 542 static bool verify_special_jvm_flags() { 543 bool success = true; 544 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 545 const SpecialFlag& flag = special_jvm_flags[i]; 546 if (lookup_special_flag(flag.name, i)) { 547 warning("Duplicate special flag declaration \"%s\"", flag.name); 548 success = false; 549 } 550 if (flag.deprecated_in.is_undefined() && 551 flag.obsolete_in.is_undefined()) { 552 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 553 success = false; 554 } 555 556 if (!flag.deprecated_in.is_undefined()) { 557 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 558 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 559 success = false; 560 } 561 562 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 563 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 564 success = false; 565 } 566 } 567 568 if (!flag.obsolete_in.is_undefined()) { 569 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 570 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 571 success = false; 572 } 573 574 // if flag has become obsolete it should not have a "globals" flag defined anymore. 575 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 576 if (Flag::find_flag(flag.name) != NULL) { 577 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 578 success = false; 579 } 580 } 581 } 582 583 if (!flag.expired_in.is_undefined()) { 584 // if flag has become expired it should not have a "globals" flag defined anymore. 585 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 586 if (Flag::find_flag(flag.name) != NULL) { 587 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 588 success = false; 589 } 590 } 591 } 592 593 } 594 return success; 595 } 596 #endif 597 598 // Parses a size specification string. 599 bool Arguments::atojulong(const char *s, julong* result) { 600 julong n = 0; 601 602 // First char must be a digit. Don't allow negative numbers or leading spaces. 603 if (!isdigit(*s)) { 604 return false; 605 } 606 607 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 608 char* remainder; 609 errno = 0; 610 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 611 if (errno != 0) { 612 return false; 613 } 614 615 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 616 if (remainder == s || strlen(remainder) > 1) { 617 return false; 618 } 619 620 switch (*remainder) { 621 case 'T': case 't': 622 *result = n * G * K; 623 // Check for overflow. 624 if (*result/((julong)G * K) != n) return false; 625 return true; 626 case 'G': case 'g': 627 *result = n * G; 628 if (*result/G != n) return false; 629 return true; 630 case 'M': case 'm': 631 *result = n * M; 632 if (*result/M != n) return false; 633 return true; 634 case 'K': case 'k': 635 *result = n * K; 636 if (*result/K != n) return false; 637 return true; 638 case '\0': 639 *result = n; 640 return true; 641 default: 642 return false; 643 } 644 } 645 646 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 647 if (size < min_size) return arg_too_small; 648 // Check that size will fit in a size_t (only relevant on 32-bit) 649 if (size > max_uintx) return arg_too_big; 650 return arg_in_range; 651 } 652 653 // Describe an argument out of range error 654 void Arguments::describe_range_error(ArgsRange errcode) { 655 switch(errcode) { 656 case arg_too_big: 657 jio_fprintf(defaultStream::error_stream(), 658 "The specified size exceeds the maximum " 659 "representable size.\n"); 660 break; 661 case arg_too_small: 662 case arg_unreadable: 663 case arg_in_range: 664 // do nothing for now 665 break; 666 default: 667 ShouldNotReachHere(); 668 } 669 } 670 671 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 672 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 673 return true; 674 } else { 675 return false; 676 } 677 } 678 679 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 680 char* end; 681 errno = 0; 682 double v = strtod(value, &end); 683 if ((errno != 0) || (*end != 0)) { 684 return false; 685 } 686 687 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 688 return true; 689 } 690 return false; 691 } 692 693 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 694 julong v; 695 int int_v; 696 intx intx_v; 697 bool is_neg = false; 698 Flag* result = Flag::find_flag(name, strlen(name)); 699 700 if (result == NULL) { 701 return false; 702 } 703 704 // Check the sign first since atojulong() parses only unsigned values. 705 if (*value == '-') { 706 if (!result->is_intx() && !result->is_int()) { 707 return false; 708 } 709 value++; 710 is_neg = true; 711 } 712 if (!Arguments::atojulong(value, &v)) { 713 return false; 714 } 715 if (result->is_int()) { 716 int_v = (int) v; 717 if (is_neg) { 718 int_v = -int_v; 719 } 720 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 721 } else if (result->is_uint()) { 722 uint uint_v = (uint) v; 723 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 724 } else if (result->is_intx()) { 725 intx_v = (intx) v; 726 if (is_neg) { 727 intx_v = -intx_v; 728 } 729 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 730 } else if (result->is_uintx()) { 731 uintx uintx_v = (uintx) v; 732 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 733 } else if (result->is_uint64_t()) { 734 uint64_t uint64_t_v = (uint64_t) v; 735 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 736 } else if (result->is_size_t()) { 737 size_t size_t_v = (size_t) v; 738 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 739 } else if (result->is_double()) { 740 double double_v = (double) v; 741 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS; 742 } else { 743 return false; 744 } 745 } 746 747 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 748 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 749 // Contract: CommandLineFlags always returns a pointer that needs freeing. 750 FREE_C_HEAP_ARRAY(char, value); 751 return true; 752 } 753 754 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 755 const char* old_value = ""; 756 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 757 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 758 size_t new_len = strlen(new_value); 759 const char* value; 760 char* free_this_too = NULL; 761 if (old_len == 0) { 762 value = new_value; 763 } else if (new_len == 0) { 764 value = old_value; 765 } else { 766 size_t length = old_len + 1 + new_len + 1; 767 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 768 // each new setting adds another LINE to the switch: 769 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 770 value = buf; 771 free_this_too = buf; 772 } 773 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 774 // CommandLineFlags always returns a pointer that needs freeing. 775 FREE_C_HEAP_ARRAY(char, value); 776 if (free_this_too != NULL) { 777 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 778 FREE_C_HEAP_ARRAY(char, free_this_too); 779 } 780 return true; 781 } 782 783 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 784 const char* real_name = real_flag_name(arg); 785 JDK_Version since = JDK_Version(); 786 switch (is_deprecated_flag(arg, &since)) { 787 case -1: 788 return NULL; // obsolete or expired, don't process normally 789 case 0: 790 return real_name; 791 case 1: { 792 if (warn) { 793 char version[256]; 794 since.to_string(version, sizeof(version)); 795 if (real_name != arg) { 796 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 797 arg, version, real_name); 798 } else { 799 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 800 arg, version); 801 } 802 } 803 return real_name; 804 } 805 } 806 ShouldNotReachHere(); 807 return NULL; 808 } 809 810 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 811 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 812 // Set tagset string buffer at max size of 256, large enough for any alias tagset 813 const int max_tagset_size = 256; 814 int max_tagset_len = max_tagset_size - 1; 815 char tagset_buffer[max_tagset_size]; 816 tagset_buffer[0] = '\0'; 817 818 // Write tag-set for aliased logging option, in string list form 819 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 820 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 821 if (i > 0) { 822 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 823 } 824 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 825 } 826 if (!alf.exactMatch) { 827 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 828 } 829 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 830 (on) ? "+" : "-", 831 name, 832 tagset_buffer, 833 (on) ? LogLevel::name(alf.level) : "off"); 834 } 835 836 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 837 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 838 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 839 if (strcmp(alf.alias_name, name) == 0) { 840 log_deprecated_flag(name, on, alf); 841 return alf; 842 } 843 } 844 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 845 return a; 846 } 847 848 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 849 850 // range of acceptable characters spelled out for portability reasons 851 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 852 #define BUFLEN 255 853 char name[BUFLEN+1]; 854 char dummy; 855 const char* real_name; 856 bool warn_if_deprecated = true; 857 858 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 859 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 860 if (alf.alias_name != NULL){ 861 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 862 return true; 863 } 864 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 865 if (real_name == NULL) { 866 return false; 867 } 868 return set_bool_flag(real_name, false, origin); 869 } 870 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 871 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 872 if (alf.alias_name != NULL){ 873 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 874 return true; 875 } 876 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 877 if (real_name == NULL) { 878 return false; 879 } 880 return set_bool_flag(real_name, true, origin); 881 } 882 883 char punct; 884 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 885 const char* value = strchr(arg, '=') + 1; 886 Flag* flag; 887 888 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 889 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 890 if (alf.alias_name != NULL) { 891 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 892 return true; 893 } 894 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 895 if (real_name == NULL) { 896 return false; 897 } 898 flag = Flag::find_flag(real_name); 899 if (flag != NULL && flag->is_ccstr()) { 900 if (flag->ccstr_accumulates()) { 901 return append_to_string_flag(real_name, value, origin); 902 } else { 903 if (value[0] == '\0') { 904 value = NULL; 905 } 906 return set_string_flag(real_name, value, origin); 907 } 908 } else { 909 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 910 } 911 } 912 913 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 914 const char* value = strchr(arg, '=') + 1; 915 // -XX:Foo:=xxx will reset the string flag to the given value. 916 if (value[0] == '\0') { 917 value = NULL; 918 } 919 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 920 if (real_name == NULL) { 921 return false; 922 } 923 return set_string_flag(real_name, value, origin); 924 } 925 926 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 927 #define SIGNED_NUMBER_RANGE "[-0123456789]" 928 #define NUMBER_RANGE "[0123456789eE+-]" 929 char value[BUFLEN + 1]; 930 char value2[BUFLEN + 1]; 931 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 932 // Looks like a floating-point number -- try again with more lenient format string 933 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 934 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 935 if (real_name == NULL) { 936 return false; 937 } 938 return set_fp_numeric_flag(real_name, value, origin); 939 } 940 } 941 942 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 943 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 944 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 945 if (real_name == NULL) { 946 return false; 947 } 948 return set_numeric_flag(real_name, value, origin); 949 } 950 951 return false; 952 } 953 954 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 955 assert(bldarray != NULL, "illegal argument"); 956 957 if (arg == NULL) { 958 return; 959 } 960 961 int new_count = *count + 1; 962 963 // expand the array and add arg to the last element 964 if (*bldarray == NULL) { 965 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 966 } else { 967 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 968 } 969 (*bldarray)[*count] = os::strdup_check_oom(arg); 970 *count = new_count; 971 } 972 973 void Arguments::build_jvm_args(const char* arg) { 974 add_string(&_jvm_args_array, &_num_jvm_args, arg); 975 } 976 977 void Arguments::build_jvm_flags(const char* arg) { 978 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 979 } 980 981 // utility function to return a string that concatenates all 982 // strings in a given char** array 983 const char* Arguments::build_resource_string(char** args, int count) { 984 if (args == NULL || count == 0) { 985 return NULL; 986 } 987 size_t length = 0; 988 for (int i = 0; i < count; i++) { 989 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 990 } 991 char* s = NEW_RESOURCE_ARRAY(char, length); 992 char* dst = s; 993 for (int j = 0; j < count; j++) { 994 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 995 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 996 dst += offset; 997 length -= offset; 998 } 999 return (const char*) s; 1000 } 1001 1002 void Arguments::print_on(outputStream* st) { 1003 st->print_cr("VM Arguments:"); 1004 if (num_jvm_flags() > 0) { 1005 st->print("jvm_flags: "); print_jvm_flags_on(st); 1006 st->cr(); 1007 } 1008 if (num_jvm_args() > 0) { 1009 st->print("jvm_args: "); print_jvm_args_on(st); 1010 st->cr(); 1011 } 1012 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1013 if (_java_class_path != NULL) { 1014 char* path = _java_class_path->value(); 1015 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1016 } 1017 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1018 } 1019 1020 void Arguments::print_summary_on(outputStream* st) { 1021 // Print the command line. Environment variables that are helpful for 1022 // reproducing the problem are written later in the hs_err file. 1023 // flags are from setting file 1024 if (num_jvm_flags() > 0) { 1025 st->print_raw("Settings File: "); 1026 print_jvm_flags_on(st); 1027 st->cr(); 1028 } 1029 // args are the command line and environment variable arguments. 1030 st->print_raw("Command Line: "); 1031 if (num_jvm_args() > 0) { 1032 print_jvm_args_on(st); 1033 } 1034 // this is the classfile and any arguments to the java program 1035 if (java_command() != NULL) { 1036 st->print("%s", java_command()); 1037 } 1038 st->cr(); 1039 } 1040 1041 void Arguments::print_jvm_flags_on(outputStream* st) { 1042 if (_num_jvm_flags > 0) { 1043 for (int i=0; i < _num_jvm_flags; i++) { 1044 st->print("%s ", _jvm_flags_array[i]); 1045 } 1046 } 1047 } 1048 1049 void Arguments::print_jvm_args_on(outputStream* st) { 1050 if (_num_jvm_args > 0) { 1051 for (int i=0; i < _num_jvm_args; i++) { 1052 st->print("%s ", _jvm_args_array[i]); 1053 } 1054 } 1055 } 1056 1057 bool Arguments::process_argument(const char* arg, 1058 jboolean ignore_unrecognized, 1059 Flag::Flags origin) { 1060 JDK_Version since = JDK_Version(); 1061 1062 if (parse_argument(arg, origin)) { 1063 return true; 1064 } 1065 1066 // Determine if the flag has '+', '-', or '=' characters. 1067 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1068 const char* const argname = has_plus_minus ? arg + 1 : arg; 1069 1070 size_t arg_len; 1071 const char* equal_sign = strchr(argname, '='); 1072 if (equal_sign == NULL) { 1073 arg_len = strlen(argname); 1074 } else { 1075 arg_len = equal_sign - argname; 1076 } 1077 1078 // Only make the obsolete check for valid arguments. 1079 if (arg_len <= BUFLEN) { 1080 // Construct a string which consists only of the argument name without '+', '-', or '='. 1081 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1082 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1083 if (is_obsolete_flag(stripped_argname, &since)) { 1084 char version[256]; 1085 since.to_string(version, sizeof(version)); 1086 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1087 return true; 1088 } 1089 #ifndef PRODUCT 1090 else { 1091 const char* replacement; 1092 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1093 log_warning(arguments)("%s has been removed. Please use %s instead.", 1094 stripped_argname, 1095 replacement); 1096 return false; 1097 } 1098 } 1099 #endif //PRODUCT 1100 } 1101 1102 // For locked flags, report a custom error message if available. 1103 // Otherwise, report the standard unrecognized VM option. 1104 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1105 if (found_flag != NULL) { 1106 char locked_message_buf[BUFLEN]; 1107 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1108 if (strlen(locked_message_buf) == 0) { 1109 if (found_flag->is_bool() && !has_plus_minus) { 1110 jio_fprintf(defaultStream::error_stream(), 1111 "Missing +/- setting for VM option '%s'\n", argname); 1112 } else if (!found_flag->is_bool() && has_plus_minus) { 1113 jio_fprintf(defaultStream::error_stream(), 1114 "Unexpected +/- setting in VM option '%s'\n", argname); 1115 } else { 1116 jio_fprintf(defaultStream::error_stream(), 1117 "Improperly specified VM option '%s'\n", argname); 1118 } 1119 } else { 1120 #ifdef PRODUCT 1121 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1122 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1123 if (ignore_unrecognized && mismatched) { 1124 return true; 1125 } 1126 #endif 1127 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1128 } 1129 } else { 1130 if (ignore_unrecognized) { 1131 return true; 1132 } 1133 jio_fprintf(defaultStream::error_stream(), 1134 "Unrecognized VM option '%s'\n", argname); 1135 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1136 if (fuzzy_matched != NULL) { 1137 jio_fprintf(defaultStream::error_stream(), 1138 "Did you mean '%s%s%s'? ", 1139 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1140 fuzzy_matched->_name, 1141 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1142 } 1143 } 1144 1145 // allow for commandline "commenting out" options like -XX:#+Verbose 1146 return arg[0] == '#'; 1147 } 1148 1149 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1150 FILE* stream = fopen(file_name, "rb"); 1151 if (stream == NULL) { 1152 if (should_exist) { 1153 jio_fprintf(defaultStream::error_stream(), 1154 "Could not open settings file %s\n", file_name); 1155 return false; 1156 } else { 1157 return true; 1158 } 1159 } 1160 1161 char token[1024]; 1162 int pos = 0; 1163 1164 bool in_white_space = true; 1165 bool in_comment = false; 1166 bool in_quote = false; 1167 char quote_c = 0; 1168 bool result = true; 1169 1170 int c = getc(stream); 1171 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1172 if (in_white_space) { 1173 if (in_comment) { 1174 if (c == '\n') in_comment = false; 1175 } else { 1176 if (c == '#') in_comment = true; 1177 else if (!isspace(c)) { 1178 in_white_space = false; 1179 token[pos++] = c; 1180 } 1181 } 1182 } else { 1183 if (c == '\n' || (!in_quote && isspace(c))) { 1184 // token ends at newline, or at unquoted whitespace 1185 // this allows a way to include spaces in string-valued options 1186 token[pos] = '\0'; 1187 logOption(token); 1188 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1189 build_jvm_flags(token); 1190 pos = 0; 1191 in_white_space = true; 1192 in_quote = false; 1193 } else if (!in_quote && (c == '\'' || c == '"')) { 1194 in_quote = true; 1195 quote_c = c; 1196 } else if (in_quote && (c == quote_c)) { 1197 in_quote = false; 1198 } else { 1199 token[pos++] = c; 1200 } 1201 } 1202 c = getc(stream); 1203 } 1204 if (pos > 0) { 1205 token[pos] = '\0'; 1206 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1207 build_jvm_flags(token); 1208 } 1209 fclose(stream); 1210 return result; 1211 } 1212 1213 //============================================================================================================= 1214 // Parsing of properties (-D) 1215 1216 const char* Arguments::get_property(const char* key) { 1217 return PropertyList_get_value(system_properties(), key); 1218 } 1219 1220 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1221 const char* eq = strchr(prop, '='); 1222 const char* key; 1223 const char* value = ""; 1224 1225 if (eq == NULL) { 1226 // property doesn't have a value, thus use passed string 1227 key = prop; 1228 } else { 1229 // property have a value, thus extract it and save to the 1230 // allocated string 1231 size_t key_len = eq - prop; 1232 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1233 1234 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1235 key = tmp_key; 1236 1237 value = &prop[key_len + 1]; 1238 } 1239 1240 if (strcmp(key, "java.compiler") == 0) { 1241 process_java_compiler_argument(value); 1242 // Record value in Arguments, but let it get passed to Java. 1243 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1244 strcmp(key, "sun.java.launcher.pid") == 0) { 1245 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1246 // private and are processed in process_sun_java_launcher_properties(); 1247 // the sun.java.launcher property is passed on to the java application 1248 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1249 // append is true, writable is true, internal is false 1250 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1251 WriteableProperty, ExternalProperty); 1252 } else { 1253 if (strcmp(key, "sun.java.command") == 0) { 1254 char *old_java_command = _java_command; 1255 _java_command = os::strdup_check_oom(value, mtArguments); 1256 if (old_java_command != NULL) { 1257 os::free(old_java_command); 1258 } 1259 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1260 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1261 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1262 // its value without going through the property list or making a Java call. 1263 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1264 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1265 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1266 os::free((void *)old_java_vendor_url_bug); 1267 } 1268 } 1269 1270 // Create new property and add at the end of the list 1271 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1272 } 1273 1274 if (key != prop) { 1275 // SystemProperty copy passed value, thus free previously allocated 1276 // memory 1277 FreeHeap((void *)key); 1278 } 1279 1280 return true; 1281 } 1282 1283 #if INCLUDE_CDS 1284 void Arguments::check_unsupported_dumping_properties() { 1285 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1286 const char* unsupported_properties[] = { "jdk.module.main", 1287 "jdk.module.limitmods", 1288 "jdk.module.path", 1289 "jdk.module.upgrade.path", 1290 "jdk.module.addmods.0", 1291 "jdk.module.patch.0" }; 1292 const char* unsupported_options[] = { "-m", // cannot use at dump time 1293 "--limit-modules", // ignored at dump time 1294 "--module-path", // ignored at dump time 1295 "--upgrade-module-path", // ignored at dump time 1296 "--add-modules", // ignored at dump time 1297 "--patch-module" // ignored at dump time 1298 }; 1299 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1300 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1301 // vm will exit with an error message. Otherwise, it will print an informational message if 1302 // -Xlog:cds is enabled. 1303 uint info_idx = 1; 1304 SystemProperty* sp = system_properties(); 1305 while (sp != NULL) { 1306 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1307 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1308 if (i < info_idx) { 1309 vm_exit_during_initialization( 1310 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1311 } else { 1312 log_info(cds)("Info: the %s option is ignored when dumping the shared archive", 1313 unsupported_options[i]); 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 2247 // Encourage steady state memory management 2248 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2249 return JNI_EINVAL; 2250 } 2251 2252 // This appears to improve mutator locality 2253 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2254 return JNI_EINVAL; 2255 } 2256 2257 // Get around early Solaris scheduling bug 2258 // (affinity vs other jobs on system) 2259 // but disallow DR and offlining (5008695). 2260 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2261 return JNI_EINVAL; 2262 } 2263 2264 return JNI_OK; 2265 } 2266 2267 // This must be called after ergonomics. 2268 void Arguments::set_bytecode_flags() { 2269 if (!RewriteBytecodes) { 2270 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2271 } 2272 } 2273 2274 // Aggressive optimization flags -XX:+AggressiveOpts 2275 jint Arguments::set_aggressive_opts_flags() { 2276 #ifdef COMPILER2 2277 if (AggressiveUnboxing) { 2278 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2279 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2280 } else if (!EliminateAutoBox) { 2281 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2282 AggressiveUnboxing = false; 2283 } 2284 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2285 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2286 } else if (!DoEscapeAnalysis) { 2287 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2288 AggressiveUnboxing = false; 2289 } 2290 } 2291 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2292 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2293 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2294 } 2295 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2296 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2297 } 2298 2299 // Feed the cache size setting into the JDK 2300 char buffer[1024]; 2301 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2302 if (!add_property(buffer)) { 2303 return JNI_ENOMEM; 2304 } 2305 } 2306 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2307 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2308 } 2309 #endif 2310 2311 if (AggressiveOpts) { 2312 // Sample flag setting code 2313 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2314 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2315 // } 2316 } 2317 2318 return JNI_OK; 2319 } 2320 2321 //=========================================================================================================== 2322 // Parsing of java.compiler property 2323 2324 void Arguments::process_java_compiler_argument(const char* arg) { 2325 // For backwards compatibility, Djava.compiler=NONE or "" 2326 // causes us to switch to -Xint mode UNLESS -Xdebug 2327 // is also specified. 2328 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2329 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2330 } 2331 } 2332 2333 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2334 _sun_java_launcher = os::strdup_check_oom(launcher); 2335 } 2336 2337 bool Arguments::created_by_java_launcher() { 2338 assert(_sun_java_launcher != NULL, "property must have value"); 2339 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2340 } 2341 2342 bool Arguments::sun_java_launcher_is_altjvm() { 2343 return _sun_java_launcher_is_altjvm; 2344 } 2345 2346 //=========================================================================================================== 2347 // Parsing of main arguments 2348 2349 #if INCLUDE_JVMCI 2350 // Check consistency of jvmci vm argument settings. 2351 bool Arguments::check_jvmci_args_consistency() { 2352 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2353 } 2354 #endif //INCLUDE_JVMCI 2355 2356 // Check consistency of GC selection 2357 bool Arguments::check_gc_consistency() { 2358 // Ensure that the user has not selected conflicting sets 2359 // of collectors. 2360 uint i = 0; 2361 if (UseSerialGC) i++; 2362 if (UseConcMarkSweepGC) i++; 2363 if (UseParallelGC || UseParallelOldGC) i++; 2364 if (UseG1GC) i++; 2365 if (i > 1) { 2366 jio_fprintf(defaultStream::error_stream(), 2367 "Conflicting collector combinations in option list; " 2368 "please refer to the release notes for the combinations " 2369 "allowed\n"); 2370 return false; 2371 } 2372 2373 return true; 2374 } 2375 2376 // Check the consistency of vm_init_args 2377 bool Arguments::check_vm_args_consistency() { 2378 // Method for adding checks for flag consistency. 2379 // The intent is to warn the user of all possible conflicts, 2380 // before returning an error. 2381 // Note: Needs platform-dependent factoring. 2382 bool status = true; 2383 2384 if (TLABRefillWasteFraction == 0) { 2385 jio_fprintf(defaultStream::error_stream(), 2386 "TLABRefillWasteFraction should be a denominator, " 2387 "not " SIZE_FORMAT "\n", 2388 TLABRefillWasteFraction); 2389 status = false; 2390 } 2391 2392 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2393 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2394 } 2395 2396 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2397 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2398 } 2399 2400 if (GCTimeLimit == 100) { 2401 // Turn off gc-overhead-limit-exceeded checks 2402 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2403 } 2404 2405 status = status && check_gc_consistency(); 2406 2407 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2408 // insists that we hold the requisite locks so that the iteration is 2409 // MT-safe. For the verification at start-up and shut-down, we don't 2410 // yet have a good way of acquiring and releasing these locks, 2411 // which are not visible at the CollectedHeap level. We want to 2412 // be able to acquire these locks and then do the iteration rather 2413 // than just disable the lock verification. This will be fixed under 2414 // bug 4788986. 2415 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2416 if (VerifyDuringStartup) { 2417 warning("Heap verification at start-up disabled " 2418 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2419 VerifyDuringStartup = false; // Disable verification at start-up 2420 } 2421 2422 if (VerifyBeforeExit) { 2423 warning("Heap verification at shutdown disabled " 2424 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2425 VerifyBeforeExit = false; // Disable verification at shutdown 2426 } 2427 } 2428 2429 if (PrintNMTStatistics) { 2430 #if INCLUDE_NMT 2431 if (MemTracker::tracking_level() == NMT_off) { 2432 #endif // INCLUDE_NMT 2433 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2434 PrintNMTStatistics = false; 2435 #if INCLUDE_NMT 2436 } 2437 #endif 2438 } 2439 2440 #if INCLUDE_JVMCI 2441 status = status && check_jvmci_args_consistency(); 2442 2443 if (EnableJVMCI) { 2444 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2445 AddProperty, UnwriteableProperty, InternalProperty); 2446 2447 if (!ScavengeRootsInCode) { 2448 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2449 ScavengeRootsInCode = 1; 2450 } 2451 } 2452 #endif 2453 2454 // Check lower bounds of the code cache 2455 // Template Interpreter code is approximately 3X larger in debug builds. 2456 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2457 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2458 jio_fprintf(defaultStream::error_stream(), 2459 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2460 os::vm_page_size()/K); 2461 status = false; 2462 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2463 jio_fprintf(defaultStream::error_stream(), 2464 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2465 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2466 status = false; 2467 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2468 jio_fprintf(defaultStream::error_stream(), 2469 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2470 min_code_cache_size/K); 2471 status = false; 2472 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2473 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2474 jio_fprintf(defaultStream::error_stream(), 2475 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2476 CODE_CACHE_SIZE_LIMIT/M); 2477 status = false; 2478 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2479 jio_fprintf(defaultStream::error_stream(), 2480 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2481 min_code_cache_size/K); 2482 status = false; 2483 } 2484 2485 #ifdef _LP64 2486 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2487 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2488 } 2489 #endif 2490 2491 #ifndef SUPPORT_RESERVED_STACK_AREA 2492 if (StackReservedPages != 0) { 2493 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2494 warning("Reserved Stack Area not supported on this platform"); 2495 } 2496 #endif 2497 2498 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2499 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2500 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2501 } 2502 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2503 } 2504 if (UseCompiler && is_interpreter_only()) { 2505 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2506 warning("UseCompiler disabled due to -Xint."); 2507 } 2508 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2509 } 2510 #ifdef COMPILER2 2511 if (PostLoopMultiversioning && !RangeCheckElimination) { 2512 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2513 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2514 } 2515 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2516 } 2517 #endif 2518 return status; 2519 } 2520 2521 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2522 const char* option_type) { 2523 if (ignore) return false; 2524 2525 const char* spacer = " "; 2526 if (option_type == NULL) { 2527 option_type = ++spacer; // Set both to the empty string. 2528 } 2529 2530 if (os::obsolete_option(option)) { 2531 jio_fprintf(defaultStream::error_stream(), 2532 "Obsolete %s%soption: %s\n", option_type, spacer, 2533 option->optionString); 2534 return false; 2535 } else { 2536 jio_fprintf(defaultStream::error_stream(), 2537 "Unrecognized %s%soption: %s\n", option_type, spacer, 2538 option->optionString); 2539 return true; 2540 } 2541 } 2542 2543 static const char* user_assertion_options[] = { 2544 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2545 }; 2546 2547 static const char* system_assertion_options[] = { 2548 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2549 }; 2550 2551 bool Arguments::parse_uintx(const char* value, 2552 uintx* uintx_arg, 2553 uintx min_size) { 2554 2555 // Check the sign first since atojulong() parses only unsigned values. 2556 bool value_is_positive = !(*value == '-'); 2557 2558 if (value_is_positive) { 2559 julong n; 2560 bool good_return = atojulong(value, &n); 2561 if (good_return) { 2562 bool above_minimum = n >= min_size; 2563 bool value_is_too_large = n > max_uintx; 2564 2565 if (above_minimum && !value_is_too_large) { 2566 *uintx_arg = n; 2567 return true; 2568 } 2569 } 2570 } 2571 return false; 2572 } 2573 2574 unsigned int addreads_count = 0; 2575 unsigned int addexports_count = 0; 2576 unsigned int addopens_count = 0; 2577 unsigned int addmods_count = 0; 2578 unsigned int patch_mod_count = 0; 2579 2580 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2581 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2582 char* property = AllocateHeap(prop_len, mtArguments); 2583 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2584 if (ret < 0 || ret >= (int)prop_len) { 2585 FreeHeap(property); 2586 return false; 2587 } 2588 bool added = add_property(property, UnwriteableProperty, internal); 2589 FreeHeap(property); 2590 return added; 2591 } 2592 2593 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2594 const unsigned int props_count_limit = 1000; 2595 const int max_digits = 3; 2596 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2597 2598 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2599 if (count < props_count_limit) { 2600 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2601 char* property = AllocateHeap(prop_len, mtArguments); 2602 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2603 if (ret < 0 || ret >= (int)prop_len) { 2604 FreeHeap(property); 2605 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2606 return false; 2607 } 2608 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2609 FreeHeap(property); 2610 return added; 2611 } 2612 2613 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2614 return false; 2615 } 2616 2617 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2618 julong* long_arg, 2619 julong min_size) { 2620 if (!atojulong(s, long_arg)) return arg_unreadable; 2621 return check_memory_size(*long_arg, min_size); 2622 } 2623 2624 // Parse JavaVMInitArgs structure 2625 2626 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2627 const JavaVMInitArgs *java_options_args, 2628 const JavaVMInitArgs *cmd_line_args) { 2629 bool patch_mod_javabase = false; 2630 2631 // Save default settings for some mode flags 2632 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2633 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2634 Arguments::_ClipInlining = ClipInlining; 2635 Arguments::_BackgroundCompilation = BackgroundCompilation; 2636 if (TieredCompilation) { 2637 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2638 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2639 } 2640 2641 // Setup flags for mixed which is the default 2642 set_mode_flags(_mixed); 2643 2644 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2645 // variable (if present). 2646 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2647 if (result != JNI_OK) { 2648 return result; 2649 } 2650 2651 // Parse args structure generated from the command line flags. 2652 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2653 if (result != JNI_OK) { 2654 return result; 2655 } 2656 2657 // Parse args structure generated from the _JAVA_OPTIONS environment 2658 // variable (if present) (mimics classic VM) 2659 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2660 if (result != JNI_OK) { 2661 return result; 2662 } 2663 2664 // Do final processing now that all arguments have been parsed 2665 result = finalize_vm_init_args(); 2666 if (result != JNI_OK) { 2667 return result; 2668 } 2669 2670 #if INCLUDE_CDS 2671 if (UseSharedSpaces && patch_mod_javabase) { 2672 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 2673 } 2674 #endif 2675 2676 return JNI_OK; 2677 } 2678 2679 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2680 // represents a valid JDWP agent. is_path==true denotes that we 2681 // are dealing with -agentpath (case where name is a path), otherwise with 2682 // -agentlib 2683 bool valid_jdwp_agent(char *name, bool is_path) { 2684 char *_name; 2685 const char *_jdwp = "jdwp"; 2686 size_t _len_jdwp, _len_prefix; 2687 2688 if (is_path) { 2689 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2690 return false; 2691 } 2692 2693 _name++; // skip past last path separator 2694 _len_prefix = strlen(JNI_LIB_PREFIX); 2695 2696 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2697 return false; 2698 } 2699 2700 _name += _len_prefix; 2701 _len_jdwp = strlen(_jdwp); 2702 2703 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2704 _name += _len_jdwp; 2705 } 2706 else { 2707 return false; 2708 } 2709 2710 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2711 return false; 2712 } 2713 2714 return true; 2715 } 2716 2717 if (strcmp(name, _jdwp) == 0) { 2718 return true; 2719 } 2720 2721 return false; 2722 } 2723 2724 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2725 // --patch-module=<module>=<file>(<pathsep><file>)* 2726 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2727 // Find the equal sign between the module name and the path specification 2728 const char* module_equal = strchr(patch_mod_tail, '='); 2729 if (module_equal == NULL) { 2730 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2731 return JNI_ERR; 2732 } else { 2733 // Pick out the module name 2734 size_t module_len = module_equal - patch_mod_tail; 2735 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2736 if (module_name != NULL) { 2737 memcpy(module_name, patch_mod_tail, module_len); 2738 *(module_name + module_len) = '\0'; 2739 // The path piece begins one past the module_equal sign 2740 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2741 FREE_C_HEAP_ARRAY(char, module_name); 2742 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2743 return JNI_ENOMEM; 2744 } 2745 } else { 2746 return JNI_ENOMEM; 2747 } 2748 } 2749 return JNI_OK; 2750 } 2751 2752 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2753 // For match_option to return remaining or value part of option string 2754 const char* tail; 2755 2756 // iterate over arguments 2757 for (int index = 0; index < args->nOptions; index++) { 2758 bool is_absolute_path = false; // for -agentpath vs -agentlib 2759 2760 const JavaVMOption* option = args->options + index; 2761 2762 if (!match_option(option, "-Djava.class.path", &tail) && 2763 !match_option(option, "-Dsun.java.command", &tail) && 2764 !match_option(option, "-Dsun.java.launcher", &tail)) { 2765 2766 // add all jvm options to the jvm_args string. This string 2767 // is used later to set the java.vm.args PerfData string constant. 2768 // the -Djava.class.path and the -Dsun.java.command options are 2769 // omitted from jvm_args string as each have their own PerfData 2770 // string constant object. 2771 build_jvm_args(option->optionString); 2772 } 2773 2774 // -verbose:[class/module/gc/jni] 2775 if (match_option(option, "-verbose", &tail)) { 2776 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2777 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2778 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2779 } else if (!strcmp(tail, ":module")) { 2780 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2781 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2782 } else if (!strcmp(tail, ":gc")) { 2783 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2784 } else if (!strcmp(tail, ":jni")) { 2785 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2786 return JNI_EINVAL; 2787 } 2788 } 2789 // -da / -ea / -disableassertions / -enableassertions 2790 // These accept an optional class/package name separated by a colon, e.g., 2791 // -da:java.lang.Thread. 2792 } else if (match_option(option, user_assertion_options, &tail, true)) { 2793 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2794 if (*tail == '\0') { 2795 JavaAssertions::setUserClassDefault(enable); 2796 } else { 2797 assert(*tail == ':', "bogus match by match_option()"); 2798 JavaAssertions::addOption(tail + 1, enable); 2799 } 2800 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2801 } else if (match_option(option, system_assertion_options, &tail, false)) { 2802 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2803 JavaAssertions::setSystemClassDefault(enable); 2804 // -bootclasspath: 2805 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2806 jio_fprintf(defaultStream::output_stream(), 2807 "-Xbootclasspath is no longer a supported option.\n"); 2808 return JNI_EINVAL; 2809 // -bootclasspath/a: 2810 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2811 Arguments::append_sysclasspath(tail); 2812 // -bootclasspath/p: 2813 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2814 jio_fprintf(defaultStream::output_stream(), 2815 "-Xbootclasspath/p is no longer a supported option.\n"); 2816 return JNI_EINVAL; 2817 // -Xrun 2818 } else if (match_option(option, "-Xrun", &tail)) { 2819 if (tail != NULL) { 2820 const char* pos = strchr(tail, ':'); 2821 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2822 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2823 jio_snprintf(name, len + 1, "%s", tail); 2824 2825 char *options = NULL; 2826 if(pos != NULL) { 2827 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2828 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2829 } 2830 #if !INCLUDE_JVMTI 2831 if (strcmp(name, "jdwp") == 0) { 2832 jio_fprintf(defaultStream::error_stream(), 2833 "Debugging agents are not supported in this VM\n"); 2834 return JNI_ERR; 2835 } 2836 #endif // !INCLUDE_JVMTI 2837 add_init_library(name, options); 2838 } 2839 } else if (match_option(option, "--add-reads=", &tail)) { 2840 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2841 return JNI_ENOMEM; 2842 } 2843 } else if (match_option(option, "--add-exports=", &tail)) { 2844 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2845 return JNI_ENOMEM; 2846 } 2847 } else if (match_option(option, "--add-opens=", &tail)) { 2848 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2849 return JNI_ENOMEM; 2850 } 2851 } else if (match_option(option, "--add-modules=", &tail)) { 2852 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2853 return JNI_ENOMEM; 2854 } 2855 } else if (match_option(option, "--limit-modules=", &tail)) { 2856 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2857 return JNI_ENOMEM; 2858 } 2859 } else if (match_option(option, "--module-path=", &tail)) { 2860 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2861 return JNI_ENOMEM; 2862 } 2863 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2864 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2865 return JNI_ENOMEM; 2866 } 2867 } else if (match_option(option, "--patch-module=", &tail)) { 2868 // --patch-module=<module>=<file>(<pathsep><file>)* 2869 int res = process_patch_mod_option(tail, patch_mod_javabase); 2870 if (res != JNI_OK) { 2871 return res; 2872 } 2873 } else if (match_option(option, "--permit-illegal-access")) { 2874 if (!create_property("jdk.module.permitIllegalAccess", "true", ExternalProperty)) { 2875 return JNI_ENOMEM; 2876 } 2877 // -agentlib and -agentpath 2878 } else if (match_option(option, "-agentlib:", &tail) || 2879 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2880 if(tail != NULL) { 2881 const char* pos = strchr(tail, '='); 2882 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2883 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2884 name[len] = '\0'; 2885 2886 char *options = NULL; 2887 if(pos != NULL) { 2888 options = os::strdup_check_oom(pos + 1, mtArguments); 2889 } 2890 #if !INCLUDE_JVMTI 2891 if (valid_jdwp_agent(name, is_absolute_path)) { 2892 jio_fprintf(defaultStream::error_stream(), 2893 "Debugging agents are not supported in this VM\n"); 2894 return JNI_ERR; 2895 } 2896 #endif // !INCLUDE_JVMTI 2897 add_init_agent(name, options, is_absolute_path); 2898 } 2899 // -javaagent 2900 } else if (match_option(option, "-javaagent:", &tail)) { 2901 #if !INCLUDE_JVMTI 2902 jio_fprintf(defaultStream::error_stream(), 2903 "Instrumentation agents are not supported in this VM\n"); 2904 return JNI_ERR; 2905 #else 2906 if (tail != NULL) { 2907 size_t length = strlen(tail) + 1; 2908 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2909 jio_snprintf(options, length, "%s", tail); 2910 add_init_agent("instrument", options, false); 2911 // java agents need module java.instrument 2912 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2913 return JNI_ENOMEM; 2914 } 2915 } 2916 #endif // !INCLUDE_JVMTI 2917 // -Xnoclassgc 2918 } else if (match_option(option, "-Xnoclassgc")) { 2919 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2920 return JNI_EINVAL; 2921 } 2922 // -Xconcgc 2923 } else if (match_option(option, "-Xconcgc")) { 2924 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2925 return JNI_EINVAL; 2926 } 2927 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2928 // -Xnoconcgc 2929 } else if (match_option(option, "-Xnoconcgc")) { 2930 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2931 return JNI_EINVAL; 2932 } 2933 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2934 // -Xbatch 2935 } else if (match_option(option, "-Xbatch")) { 2936 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2937 return JNI_EINVAL; 2938 } 2939 // -Xmn for compatibility with other JVM vendors 2940 } else if (match_option(option, "-Xmn", &tail)) { 2941 julong long_initial_young_size = 0; 2942 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2943 if (errcode != arg_in_range) { 2944 jio_fprintf(defaultStream::error_stream(), 2945 "Invalid initial young generation size: %s\n", option->optionString); 2946 describe_range_error(errcode); 2947 return JNI_EINVAL; 2948 } 2949 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2950 return JNI_EINVAL; 2951 } 2952 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2953 return JNI_EINVAL; 2954 } 2955 // -Xms 2956 } else if (match_option(option, "-Xms", &tail)) { 2957 julong long_initial_heap_size = 0; 2958 // an initial heap size of 0 means automatically determine 2959 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2960 if (errcode != arg_in_range) { 2961 jio_fprintf(defaultStream::error_stream(), 2962 "Invalid initial heap size: %s\n", option->optionString); 2963 describe_range_error(errcode); 2964 return JNI_EINVAL; 2965 } 2966 set_min_heap_size((size_t)long_initial_heap_size); 2967 // Currently the minimum size and the initial heap sizes are the same. 2968 // Can be overridden with -XX:InitialHeapSize. 2969 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2970 return JNI_EINVAL; 2971 } 2972 // -Xmx 2973 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2974 julong long_max_heap_size = 0; 2975 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2976 if (errcode != arg_in_range) { 2977 jio_fprintf(defaultStream::error_stream(), 2978 "Invalid maximum heap size: %s\n", option->optionString); 2979 describe_range_error(errcode); 2980 return JNI_EINVAL; 2981 } 2982 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2983 return JNI_EINVAL; 2984 } 2985 // Xmaxf 2986 } else if (match_option(option, "-Xmaxf", &tail)) { 2987 char* err; 2988 int maxf = (int)(strtod(tail, &err) * 100); 2989 if (*err != '\0' || *tail == '\0') { 2990 jio_fprintf(defaultStream::error_stream(), 2991 "Bad max heap free percentage size: %s\n", 2992 option->optionString); 2993 return JNI_EINVAL; 2994 } else { 2995 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2996 return JNI_EINVAL; 2997 } 2998 } 2999 // Xminf 3000 } else if (match_option(option, "-Xminf", &tail)) { 3001 char* err; 3002 int minf = (int)(strtod(tail, &err) * 100); 3003 if (*err != '\0' || *tail == '\0') { 3004 jio_fprintf(defaultStream::error_stream(), 3005 "Bad min heap free percentage size: %s\n", 3006 option->optionString); 3007 return JNI_EINVAL; 3008 } else { 3009 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3010 return JNI_EINVAL; 3011 } 3012 } 3013 // -Xss 3014 } else if (match_option(option, "-Xss", &tail)) { 3015 julong long_ThreadStackSize = 0; 3016 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3017 if (errcode != arg_in_range) { 3018 jio_fprintf(defaultStream::error_stream(), 3019 "Invalid thread stack size: %s\n", option->optionString); 3020 describe_range_error(errcode); 3021 return JNI_EINVAL; 3022 } 3023 // Internally track ThreadStackSize in units of 1024 bytes. 3024 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 3025 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 3026 return JNI_EINVAL; 3027 } 3028 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 3029 } else if (match_option(option, "-Xoss", &tail) || 3030 match_option(option, "-Xsqnopause") || 3031 match_option(option, "-Xoptimize") || 3032 match_option(option, "-Xboundthreads") || 3033 match_option(option, "-Xusealtsigs")) { 3034 // All these options are deprecated in JDK 9 and will be removed in a future release 3035 char version[256]; 3036 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3037 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3038 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3039 julong long_CodeCacheExpansionSize = 0; 3040 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3041 if (errcode != arg_in_range) { 3042 jio_fprintf(defaultStream::error_stream(), 3043 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3044 os::vm_page_size()/K); 3045 return JNI_EINVAL; 3046 } 3047 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3048 return JNI_EINVAL; 3049 } 3050 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3051 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3052 julong long_ReservedCodeCacheSize = 0; 3053 3054 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3055 if (errcode != arg_in_range) { 3056 jio_fprintf(defaultStream::error_stream(), 3057 "Invalid maximum code cache size: %s.\n", option->optionString); 3058 return JNI_EINVAL; 3059 } 3060 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3061 return JNI_EINVAL; 3062 } 3063 // -XX:NonNMethodCodeHeapSize= 3064 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3065 julong long_NonNMethodCodeHeapSize = 0; 3066 3067 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3068 if (errcode != arg_in_range) { 3069 jio_fprintf(defaultStream::error_stream(), 3070 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3071 return JNI_EINVAL; 3072 } 3073 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3074 return JNI_EINVAL; 3075 } 3076 // -XX:ProfiledCodeHeapSize= 3077 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3078 julong long_ProfiledCodeHeapSize = 0; 3079 3080 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3081 if (errcode != arg_in_range) { 3082 jio_fprintf(defaultStream::error_stream(), 3083 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3084 return JNI_EINVAL; 3085 } 3086 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3087 return JNI_EINVAL; 3088 } 3089 // -XX:NonProfiledCodeHeapSizee= 3090 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3091 julong long_NonProfiledCodeHeapSize = 0; 3092 3093 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3094 if (errcode != arg_in_range) { 3095 jio_fprintf(defaultStream::error_stream(), 3096 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3097 return JNI_EINVAL; 3098 } 3099 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3100 return JNI_EINVAL; 3101 } 3102 // -green 3103 } else if (match_option(option, "-green")) { 3104 jio_fprintf(defaultStream::error_stream(), 3105 "Green threads support not available\n"); 3106 return JNI_EINVAL; 3107 // -native 3108 } else if (match_option(option, "-native")) { 3109 // HotSpot always uses native threads, ignore silently for compatibility 3110 // -Xrs 3111 } else if (match_option(option, "-Xrs")) { 3112 // Classic/EVM option, new functionality 3113 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3114 return JNI_EINVAL; 3115 } 3116 // -Xprof 3117 } else if (match_option(option, "-Xprof")) { 3118 #if INCLUDE_FPROF 3119 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release."); 3120 _has_profile = true; 3121 #else // INCLUDE_FPROF 3122 jio_fprintf(defaultStream::error_stream(), 3123 "Flat profiling is not supported in this VM.\n"); 3124 return JNI_ERR; 3125 #endif // INCLUDE_FPROF 3126 // -Xconcurrentio 3127 } else if (match_option(option, "-Xconcurrentio")) { 3128 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3129 return JNI_EINVAL; 3130 } 3131 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3132 return JNI_EINVAL; 3133 } 3134 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3135 return JNI_EINVAL; 3136 } 3137 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3138 return JNI_EINVAL; 3139 } 3140 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3141 return JNI_EINVAL; 3142 } 3143 3144 // -Xinternalversion 3145 } else if (match_option(option, "-Xinternalversion")) { 3146 jio_fprintf(defaultStream::output_stream(), "%s\n", 3147 VM_Version::internal_vm_info_string()); 3148 vm_exit(0); 3149 #ifndef PRODUCT 3150 // -Xprintflags 3151 } else if (match_option(option, "-Xprintflags")) { 3152 CommandLineFlags::printFlags(tty, false); 3153 vm_exit(0); 3154 #endif 3155 // -D 3156 } else if (match_option(option, "-D", &tail)) { 3157 const char* value; 3158 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3159 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3160 // abort if -Djava.endorsed.dirs is set 3161 jio_fprintf(defaultStream::output_stream(), 3162 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3163 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3164 return JNI_EINVAL; 3165 } 3166 if (match_option(option, "-Djava.ext.dirs=", &value) && 3167 *value != '\0' && strcmp(value, "\"\"") != 0) { 3168 // abort if -Djava.ext.dirs is set 3169 jio_fprintf(defaultStream::output_stream(), 3170 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3171 return JNI_EINVAL; 3172 } 3173 // Check for module related properties. They must be set using the modules 3174 // options. For example: use "--add-modules=java.sql", not 3175 // "-Djdk.module.addmods=java.sql" 3176 if (is_internal_module_property(option->optionString + 2)) { 3177 needs_module_property_warning = true; 3178 continue; 3179 } 3180 3181 if (!add_property(tail)) { 3182 return JNI_ENOMEM; 3183 } 3184 // Out of the box management support 3185 if (match_option(option, "-Dcom.sun.management", &tail)) { 3186 #if INCLUDE_MANAGEMENT 3187 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3188 return JNI_EINVAL; 3189 } 3190 // management agent in module jdk.management.agent 3191 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3192 return JNI_ENOMEM; 3193 } 3194 #else 3195 jio_fprintf(defaultStream::output_stream(), 3196 "-Dcom.sun.management is not supported in this VM.\n"); 3197 return JNI_ERR; 3198 #endif 3199 } 3200 // -Xint 3201 } else if (match_option(option, "-Xint")) { 3202 set_mode_flags(_int); 3203 // -Xmixed 3204 } else if (match_option(option, "-Xmixed")) { 3205 set_mode_flags(_mixed); 3206 // -Xcomp 3207 } else if (match_option(option, "-Xcomp")) { 3208 // for testing the compiler; turn off all flags that inhibit compilation 3209 set_mode_flags(_comp); 3210 // -Xshare:dump 3211 } else if (match_option(option, "-Xshare:dump")) { 3212 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3213 return JNI_EINVAL; 3214 } 3215 set_mode_flags(_int); // Prevent compilation, which creates objects 3216 // -Xshare:on 3217 } else if (match_option(option, "-Xshare:on")) { 3218 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3219 return JNI_EINVAL; 3220 } 3221 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3222 return JNI_EINVAL; 3223 } 3224 // -Xshare:auto 3225 } else if (match_option(option, "-Xshare:auto")) { 3226 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3227 return JNI_EINVAL; 3228 } 3229 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3230 return JNI_EINVAL; 3231 } 3232 // -Xshare:off 3233 } else if (match_option(option, "-Xshare:off")) { 3234 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3235 return JNI_EINVAL; 3236 } 3237 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3238 return JNI_EINVAL; 3239 } 3240 // -Xverify 3241 } else if (match_option(option, "-Xverify", &tail)) { 3242 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3243 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3244 return JNI_EINVAL; 3245 } 3246 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3247 return JNI_EINVAL; 3248 } 3249 } else if (strcmp(tail, ":remote") == 0) { 3250 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3251 return JNI_EINVAL; 3252 } 3253 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3254 return JNI_EINVAL; 3255 } 3256 } else if (strcmp(tail, ":none") == 0) { 3257 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3258 return JNI_EINVAL; 3259 } 3260 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3261 return JNI_EINVAL; 3262 } 3263 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3264 return JNI_EINVAL; 3265 } 3266 // -Xdebug 3267 } else if (match_option(option, "-Xdebug")) { 3268 // note this flag has been used, then ignore 3269 set_xdebug_mode(true); 3270 // -Xnoagent 3271 } else if (match_option(option, "-Xnoagent")) { 3272 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3273 } else if (match_option(option, "-Xloggc:", &tail)) { 3274 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3275 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3276 _gc_log_filename = os::strdup_check_oom(tail); 3277 } else if (match_option(option, "-Xlog", &tail)) { 3278 bool ret = false; 3279 if (strcmp(tail, ":help") == 0) { 3280 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3281 vm_exit(0); 3282 } else if (strcmp(tail, ":disable") == 0) { 3283 LogConfiguration::disable_logging(); 3284 ret = true; 3285 } else if (*tail == '\0') { 3286 ret = LogConfiguration::parse_command_line_arguments(); 3287 assert(ret, "-Xlog without arguments should never fail to parse"); 3288 } else if (*tail == ':') { 3289 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3290 } 3291 if (ret == false) { 3292 jio_fprintf(defaultStream::error_stream(), 3293 "Invalid -Xlog option '-Xlog%s'\n", 3294 tail); 3295 return JNI_EINVAL; 3296 } 3297 // JNI hooks 3298 } else if (match_option(option, "-Xcheck", &tail)) { 3299 if (!strcmp(tail, ":jni")) { 3300 #if !INCLUDE_JNI_CHECK 3301 warning("JNI CHECKING is not supported in this VM"); 3302 #else 3303 CheckJNICalls = true; 3304 #endif // INCLUDE_JNI_CHECK 3305 } else if (is_bad_option(option, args->ignoreUnrecognized, 3306 "check")) { 3307 return JNI_EINVAL; 3308 } 3309 } else if (match_option(option, "vfprintf")) { 3310 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3311 } else if (match_option(option, "exit")) { 3312 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3313 } else if (match_option(option, "abort")) { 3314 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3315 // -XX:+AggressiveHeap 3316 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3317 jint result = set_aggressive_heap_flags(); 3318 if (result != JNI_OK) { 3319 return result; 3320 } 3321 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3322 // and the last option wins. 3323 } else if (match_option(option, "-XX:+NeverTenure")) { 3324 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3325 return JNI_EINVAL; 3326 } 3327 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3328 return JNI_EINVAL; 3329 } 3330 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3331 return JNI_EINVAL; 3332 } 3333 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3334 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3335 return JNI_EINVAL; 3336 } 3337 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3338 return JNI_EINVAL; 3339 } 3340 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3341 return JNI_EINVAL; 3342 } 3343 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3344 uintx max_tenuring_thresh = 0; 3345 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3346 jio_fprintf(defaultStream::error_stream(), 3347 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3348 return JNI_EINVAL; 3349 } 3350 3351 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3352 return JNI_EINVAL; 3353 } 3354 3355 if (MaxTenuringThreshold == 0) { 3356 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3357 return JNI_EINVAL; 3358 } 3359 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3360 return JNI_EINVAL; 3361 } 3362 } else { 3363 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3364 return JNI_EINVAL; 3365 } 3366 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3367 return JNI_EINVAL; 3368 } 3369 } 3370 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3371 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3372 return JNI_EINVAL; 3373 } 3374 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3375 return JNI_EINVAL; 3376 } 3377 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3378 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3379 return JNI_EINVAL; 3380 } 3381 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3382 return JNI_EINVAL; 3383 } 3384 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3385 #if defined(DTRACE_ENABLED) 3386 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3387 return JNI_EINVAL; 3388 } 3389 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3390 return JNI_EINVAL; 3391 } 3392 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3393 return JNI_EINVAL; 3394 } 3395 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3396 return JNI_EINVAL; 3397 } 3398 #else // defined(DTRACE_ENABLED) 3399 jio_fprintf(defaultStream::error_stream(), 3400 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3401 return JNI_EINVAL; 3402 #endif // defined(DTRACE_ENABLED) 3403 #ifdef ASSERT 3404 } else if (match_option(option, "-XX:+FullGCALot")) { 3405 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3406 return JNI_EINVAL; 3407 } 3408 // disable scavenge before parallel mark-compact 3409 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3410 return JNI_EINVAL; 3411 } 3412 #endif 3413 #if !INCLUDE_MANAGEMENT 3414 } else if (match_option(option, "-XX:+ManagementServer")) { 3415 jio_fprintf(defaultStream::error_stream(), 3416 "ManagementServer is not supported in this VM.\n"); 3417 return JNI_ERR; 3418 #endif // INCLUDE_MANAGEMENT 3419 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3420 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3421 // already been handled 3422 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3423 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3424 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3425 return JNI_EINVAL; 3426 } 3427 } 3428 // Unknown option 3429 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3430 return JNI_ERR; 3431 } 3432 } 3433 3434 // PrintSharedArchiveAndExit will turn on 3435 // -Xshare:on 3436 // -Xlog:class+path=info 3437 if (PrintSharedArchiveAndExit) { 3438 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3439 return JNI_EINVAL; 3440 } 3441 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3442 return JNI_EINVAL; 3443 } 3444 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3445 } 3446 3447 // Change the default value for flags which have different default values 3448 // when working with older JDKs. 3449 #ifdef LINUX 3450 if (JDK_Version::current().compare_major(6) <= 0 && 3451 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3452 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3453 } 3454 #endif // LINUX 3455 fix_appclasspath(); 3456 return JNI_OK; 3457 } 3458 3459 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3460 // For java.base check for duplicate --patch-module options being specified on the command line. 3461 // This check is only required for java.base, all other duplicate module specifications 3462 // will be checked during module system initialization. The module system initialization 3463 // will throw an ExceptionInInitializerError if this situation occurs. 3464 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3465 if (*patch_mod_javabase) { 3466 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3467 } else { 3468 *patch_mod_javabase = true; 3469 } 3470 } 3471 3472 // Create GrowableArray lazily, only if --patch-module has been specified 3473 if (_patch_mod_prefix == NULL) { 3474 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3475 } 3476 3477 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3478 } 3479 3480 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3481 // 3482 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3483 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3484 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3485 // path is treated as the current directory. 3486 // 3487 // This causes problems with CDS, which requires that all directories specified in the classpath 3488 // must be empty. In most cases, applications do NOT want to load classes from the current 3489 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3490 // scripts compatible with CDS. 3491 void Arguments::fix_appclasspath() { 3492 if (IgnoreEmptyClassPaths) { 3493 const char separator = *os::path_separator(); 3494 const char* src = _java_class_path->value(); 3495 3496 // skip over all the leading empty paths 3497 while (*src == separator) { 3498 src ++; 3499 } 3500 3501 char* copy = os::strdup_check_oom(src, mtArguments); 3502 3503 // trim all trailing empty paths 3504 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3505 *tail = '\0'; 3506 } 3507 3508 char from[3] = {separator, separator, '\0'}; 3509 char to [2] = {separator, '\0'}; 3510 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3511 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3512 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3513 } 3514 3515 _java_class_path->set_writeable_value(copy); 3516 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3517 } 3518 } 3519 3520 static bool has_jar_files(const char* directory) { 3521 DIR* dir = os::opendir(directory); 3522 if (dir == NULL) return false; 3523 3524 struct dirent *entry; 3525 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3526 bool hasJarFile = false; 3527 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3528 const char* name = entry->d_name; 3529 const char* ext = name + strlen(name) - 4; 3530 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3531 } 3532 FREE_C_HEAP_ARRAY(char, dbuf); 3533 os::closedir(dir); 3534 return hasJarFile ; 3535 } 3536 3537 static int check_non_empty_dirs(const char* path) { 3538 const char separator = *os::path_separator(); 3539 const char* const end = path + strlen(path); 3540 int nonEmptyDirs = 0; 3541 while (path < end) { 3542 const char* tmp_end = strchr(path, separator); 3543 if (tmp_end == NULL) { 3544 if (has_jar_files(path)) { 3545 nonEmptyDirs++; 3546 jio_fprintf(defaultStream::output_stream(), 3547 "Non-empty directory: %s\n", path); 3548 } 3549 path = end; 3550 } else { 3551 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3552 memcpy(dirpath, path, tmp_end - path); 3553 dirpath[tmp_end - path] = '\0'; 3554 if (has_jar_files(dirpath)) { 3555 nonEmptyDirs++; 3556 jio_fprintf(defaultStream::output_stream(), 3557 "Non-empty directory: %s\n", dirpath); 3558 } 3559 FREE_C_HEAP_ARRAY(char, dirpath); 3560 path = tmp_end + 1; 3561 } 3562 } 3563 return nonEmptyDirs; 3564 } 3565 3566 jint Arguments::finalize_vm_init_args() { 3567 // check if the default lib/endorsed directory exists; if so, error 3568 char path[JVM_MAXPATHLEN]; 3569 const char* fileSep = os::file_separator(); 3570 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3571 3572 if (CheckEndorsedAndExtDirs) { 3573 int nonEmptyDirs = 0; 3574 // check endorsed directory 3575 nonEmptyDirs += check_non_empty_dirs(path); 3576 // check the extension directories 3577 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3578 if (nonEmptyDirs > 0) { 3579 return JNI_ERR; 3580 } 3581 } 3582 3583 DIR* dir = os::opendir(path); 3584 if (dir != NULL) { 3585 jio_fprintf(defaultStream::output_stream(), 3586 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3587 "in modular form will be supported via the concept of upgradeable modules.\n"); 3588 os::closedir(dir); 3589 return JNI_ERR; 3590 } 3591 3592 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3593 dir = os::opendir(path); 3594 if (dir != NULL) { 3595 jio_fprintf(defaultStream::output_stream(), 3596 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3597 "Use -classpath instead.\n."); 3598 os::closedir(dir); 3599 return JNI_ERR; 3600 } 3601 3602 // This must be done after all arguments have been processed. 3603 // java_compiler() true means set to "NONE" or empty. 3604 if (java_compiler() && !xdebug_mode()) { 3605 // For backwards compatibility, we switch to interpreted mode if 3606 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3607 // not specified. 3608 set_mode_flags(_int); 3609 } 3610 3611 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3612 // but like -Xint, leave compilation thresholds unaffected. 3613 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3614 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3615 set_mode_flags(_int); 3616 } 3617 3618 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3619 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3620 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3621 } 3622 3623 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3624 // Don't degrade server performance for footprint 3625 if (FLAG_IS_DEFAULT(UseLargePages) && 3626 MaxHeapSize < LargePageHeapSizeThreshold) { 3627 // No need for large granularity pages w/small heaps. 3628 // Note that large pages are enabled/disabled for both the 3629 // Java heap and the code cache. 3630 FLAG_SET_DEFAULT(UseLargePages, false); 3631 } 3632 3633 #elif defined(COMPILER2) 3634 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3635 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3636 } 3637 #endif 3638 3639 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3640 UNSUPPORTED_OPTION(ProfileInterpreter); 3641 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3642 #endif 3643 3644 #ifndef TIERED 3645 // Tiered compilation is undefined. 3646 UNSUPPORTED_OPTION(TieredCompilation); 3647 #endif 3648 3649 #if INCLUDE_JVMCI 3650 if (EnableJVMCI && 3651 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3652 return JNI_ENOMEM; 3653 } 3654 #endif 3655 3656 // If we are running in a headless jre, force java.awt.headless property 3657 // to be true unless the property has already been set. 3658 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3659 if (os::is_headless_jre()) { 3660 const char* headless = Arguments::get_property("java.awt.headless"); 3661 if (headless == NULL) { 3662 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3663 if (headless_env == NULL) { 3664 if (!add_property("java.awt.headless=true")) { 3665 return JNI_ENOMEM; 3666 } 3667 } else { 3668 char buffer[256]; 3669 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3670 if (!add_property(buffer)) { 3671 return JNI_ENOMEM; 3672 } 3673 } 3674 } 3675 } 3676 3677 if (!check_vm_args_consistency()) { 3678 return JNI_ERR; 3679 } 3680 3681 #if INCLUDE_JVMCI 3682 if (UseJVMCICompiler) { 3683 Compilation_mode = CompMode_server; 3684 } 3685 #endif 3686 3687 return JNI_OK; 3688 } 3689 3690 // Helper class for controlling the lifetime of JavaVMInitArgs 3691 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3692 // deleted on the destruction of the ScopedVMInitArgs object. 3693 class ScopedVMInitArgs : public StackObj { 3694 private: 3695 JavaVMInitArgs _args; 3696 char* _container_name; 3697 bool _is_set; 3698 char* _vm_options_file_arg; 3699 3700 public: 3701 ScopedVMInitArgs(const char *container_name) { 3702 _args.version = JNI_VERSION_1_2; 3703 _args.nOptions = 0; 3704 _args.options = NULL; 3705 _args.ignoreUnrecognized = false; 3706 _container_name = (char *)container_name; 3707 _is_set = false; 3708 _vm_options_file_arg = NULL; 3709 } 3710 3711 // Populates the JavaVMInitArgs object represented by this 3712 // ScopedVMInitArgs object with the arguments in options. The 3713 // allocated memory is deleted by the destructor. If this method 3714 // returns anything other than JNI_OK, then this object is in a 3715 // partially constructed state, and should be abandoned. 3716 jint set_args(GrowableArray<JavaVMOption>* options) { 3717 _is_set = true; 3718 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3719 JavaVMOption, options->length(), mtArguments); 3720 if (options_arr == NULL) { 3721 return JNI_ENOMEM; 3722 } 3723 _args.options = options_arr; 3724 3725 for (int i = 0; i < options->length(); i++) { 3726 options_arr[i] = options->at(i); 3727 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3728 if (options_arr[i].optionString == NULL) { 3729 // Rely on the destructor to do cleanup. 3730 _args.nOptions = i; 3731 return JNI_ENOMEM; 3732 } 3733 } 3734 3735 _args.nOptions = options->length(); 3736 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3737 return JNI_OK; 3738 } 3739 3740 JavaVMInitArgs* get() { return &_args; } 3741 char* container_name() { return _container_name; } 3742 bool is_set() { return _is_set; } 3743 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3744 char* vm_options_file_arg() { return _vm_options_file_arg; } 3745 3746 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3747 if (_vm_options_file_arg != NULL) { 3748 os::free(_vm_options_file_arg); 3749 } 3750 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3751 } 3752 3753 ~ScopedVMInitArgs() { 3754 if (_vm_options_file_arg != NULL) { 3755 os::free(_vm_options_file_arg); 3756 } 3757 if (_args.options == NULL) return; 3758 for (int i = 0; i < _args.nOptions; i++) { 3759 os::free(_args.options[i].optionString); 3760 } 3761 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3762 } 3763 3764 // Insert options into this option list, to replace option at 3765 // vm_options_file_pos (-XX:VMOptionsFile) 3766 jint insert(const JavaVMInitArgs* args, 3767 const JavaVMInitArgs* args_to_insert, 3768 const int vm_options_file_pos) { 3769 assert(_args.options == NULL, "shouldn't be set yet"); 3770 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3771 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3772 3773 int length = args->nOptions + args_to_insert->nOptions - 1; 3774 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3775 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3776 for (int i = 0; i < args->nOptions; i++) { 3777 if (i == vm_options_file_pos) { 3778 // insert the new options starting at the same place as the 3779 // -XX:VMOptionsFile option 3780 for (int j = 0; j < args_to_insert->nOptions; j++) { 3781 options->push(args_to_insert->options[j]); 3782 } 3783 } else { 3784 options->push(args->options[i]); 3785 } 3786 } 3787 // make into options array 3788 jint result = set_args(options); 3789 delete options; 3790 return result; 3791 } 3792 }; 3793 3794 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3795 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3796 } 3797 3798 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3799 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3800 } 3801 3802 jint Arguments::parse_options_environment_variable(const char* name, 3803 ScopedVMInitArgs* vm_args) { 3804 char *buffer = ::getenv(name); 3805 3806 // Don't check this environment variable if user has special privileges 3807 // (e.g. unix su command). 3808 if (buffer == NULL || os::have_special_privileges()) { 3809 return JNI_OK; 3810 } 3811 3812 if ((buffer = os::strdup(buffer)) == NULL) { 3813 return JNI_ENOMEM; 3814 } 3815 3816 jio_fprintf(defaultStream::error_stream(), 3817 "Picked up %s: %s\n", name, buffer); 3818 3819 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3820 3821 os::free(buffer); 3822 return retcode; 3823 } 3824 3825 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3826 // read file into buffer 3827 int fd = ::open(file_name, O_RDONLY); 3828 if (fd < 0) { 3829 jio_fprintf(defaultStream::error_stream(), 3830 "Could not open options file '%s'\n", 3831 file_name); 3832 return JNI_ERR; 3833 } 3834 3835 struct stat stbuf; 3836 int retcode = os::stat(file_name, &stbuf); 3837 if (retcode != 0) { 3838 jio_fprintf(defaultStream::error_stream(), 3839 "Could not stat options file '%s'\n", 3840 file_name); 3841 os::close(fd); 3842 return JNI_ERR; 3843 } 3844 3845 if (stbuf.st_size == 0) { 3846 // tell caller there is no option data and that is ok 3847 os::close(fd); 3848 return JNI_OK; 3849 } 3850 3851 // '+ 1' for NULL termination even with max bytes 3852 size_t bytes_alloc = stbuf.st_size + 1; 3853 3854 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3855 if (NULL == buf) { 3856 jio_fprintf(defaultStream::error_stream(), 3857 "Could not allocate read buffer for options file parse\n"); 3858 os::close(fd); 3859 return JNI_ENOMEM; 3860 } 3861 3862 memset(buf, 0, bytes_alloc); 3863 3864 // Fill buffer 3865 // Use ::read() instead of os::read because os::read() 3866 // might do a thread state transition 3867 // and it is too early for that here 3868 3869 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3870 os::close(fd); 3871 if (bytes_read < 0) { 3872 FREE_C_HEAP_ARRAY(char, buf); 3873 jio_fprintf(defaultStream::error_stream(), 3874 "Could not read options file '%s'\n", file_name); 3875 return JNI_ERR; 3876 } 3877 3878 if (bytes_read == 0) { 3879 // tell caller there is no option data and that is ok 3880 FREE_C_HEAP_ARRAY(char, buf); 3881 return JNI_OK; 3882 } 3883 3884 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3885 3886 FREE_C_HEAP_ARRAY(char, buf); 3887 return retcode; 3888 } 3889 3890 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3891 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3892 3893 // some pointers to help with parsing 3894 char *buffer_end = buffer + buf_len; 3895 char *opt_hd = buffer; 3896 char *wrt = buffer; 3897 char *rd = buffer; 3898 3899 // parse all options 3900 while (rd < buffer_end) { 3901 // skip leading white space from the input string 3902 while (rd < buffer_end && isspace(*rd)) { 3903 rd++; 3904 } 3905 3906 if (rd >= buffer_end) { 3907 break; 3908 } 3909 3910 // Remember this is where we found the head of the token. 3911 opt_hd = wrt; 3912 3913 // Tokens are strings of non white space characters separated 3914 // by one or more white spaces. 3915 while (rd < buffer_end && !isspace(*rd)) { 3916 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3917 int quote = *rd; // matching quote to look for 3918 rd++; // don't copy open quote 3919 while (rd < buffer_end && *rd != quote) { 3920 // include everything (even spaces) 3921 // up until the close quote 3922 *wrt++ = *rd++; // copy to option string 3923 } 3924 3925 if (rd < buffer_end) { 3926 rd++; // don't copy close quote 3927 } else { 3928 // did not see closing quote 3929 jio_fprintf(defaultStream::error_stream(), 3930 "Unmatched quote in %s\n", name); 3931 delete options; 3932 return JNI_ERR; 3933 } 3934 } else { 3935 *wrt++ = *rd++; // copy to option string 3936 } 3937 } 3938 3939 // steal a white space character and set it to NULL 3940 *wrt++ = '\0'; 3941 // We now have a complete token 3942 3943 JavaVMOption option; 3944 option.optionString = opt_hd; 3945 option.extraInfo = NULL; 3946 3947 options->append(option); // Fill in option 3948 3949 rd++; // Advance to next character 3950 } 3951 3952 // Fill out JavaVMInitArgs structure. 3953 jint status = vm_args->set_args(options); 3954 3955 delete options; 3956 return status; 3957 } 3958 3959 void Arguments::set_shared_spaces_flags() { 3960 if (DumpSharedSpaces) { 3961 if (FailOverToOldVerifier) { 3962 // Don't fall back to the old verifier on verification failure. If a 3963 // class fails verification with the split verifier, it might fail the 3964 // CDS runtime verifier constraint check. In that case, we don't want 3965 // to share the class. We only archive classes that pass the split verifier. 3966 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3967 } 3968 3969 if (RequireSharedSpaces) { 3970 warning("Cannot dump shared archive while using shared archive"); 3971 } 3972 UseSharedSpaces = false; 3973 #ifdef _LP64 3974 if (!UseCompressedOops || !UseCompressedClassPointers) { 3975 vm_exit_during_initialization( 3976 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3977 } 3978 } else { 3979 if (!UseCompressedOops || !UseCompressedClassPointers) { 3980 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3981 } 3982 #endif 3983 } 3984 } 3985 3986 // Sharing support 3987 // Construct the path to the archive 3988 static char* get_shared_archive_path() { 3989 char *shared_archive_path; 3990 if (SharedArchiveFile == NULL) { 3991 char jvm_path[JVM_MAXPATHLEN]; 3992 os::jvm_path(jvm_path, sizeof(jvm_path)); 3993 char *end = strrchr(jvm_path, *os::file_separator()); 3994 if (end != NULL) *end = '\0'; 3995 size_t jvm_path_len = strlen(jvm_path); 3996 size_t file_sep_len = strlen(os::file_separator()); 3997 const size_t len = jvm_path_len + file_sep_len + 20; 3998 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3999 if (shared_archive_path != NULL) { 4000 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 4001 jvm_path, os::file_separator()); 4002 } 4003 } else { 4004 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 4005 } 4006 return shared_archive_path; 4007 } 4008 4009 #ifndef PRODUCT 4010 // Determine whether LogVMOutput should be implicitly turned on. 4011 static bool use_vm_log() { 4012 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4013 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4014 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4015 PrintAssembly || TraceDeoptimization || TraceDependencies || 4016 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4017 return true; 4018 } 4019 4020 #ifdef COMPILER1 4021 if (PrintC1Statistics) { 4022 return true; 4023 } 4024 #endif // COMPILER1 4025 4026 #ifdef COMPILER2 4027 if (PrintOptoAssembly || PrintOptoStatistics) { 4028 return true; 4029 } 4030 #endif // COMPILER2 4031 4032 return false; 4033 } 4034 4035 #endif // PRODUCT 4036 4037 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4038 for (int index = 0; index < args->nOptions; index++) { 4039 const JavaVMOption* option = args->options + index; 4040 const char* tail; 4041 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4042 return true; 4043 } 4044 } 4045 return false; 4046 } 4047 4048 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4049 const char* vm_options_file, 4050 const int vm_options_file_pos, 4051 ScopedVMInitArgs* vm_options_file_args, 4052 ScopedVMInitArgs* args_out) { 4053 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4054 if (code != JNI_OK) { 4055 return code; 4056 } 4057 4058 if (vm_options_file_args->get()->nOptions < 1) { 4059 return JNI_OK; 4060 } 4061 4062 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4063 jio_fprintf(defaultStream::error_stream(), 4064 "A VM options file may not refer to a VM options file. " 4065 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4066 "options file '%s' in options container '%s' is an error.\n", 4067 vm_options_file_args->vm_options_file_arg(), 4068 vm_options_file_args->container_name()); 4069 return JNI_EINVAL; 4070 } 4071 4072 return args_out->insert(args, vm_options_file_args->get(), 4073 vm_options_file_pos); 4074 } 4075 4076 // Expand -XX:VMOptionsFile found in args_in as needed. 4077 // mod_args and args_out parameters may return values as needed. 4078 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4079 ScopedVMInitArgs* mod_args, 4080 JavaVMInitArgs** args_out) { 4081 jint code = match_special_option_and_act(args_in, mod_args); 4082 if (code != JNI_OK) { 4083 return code; 4084 } 4085 4086 if (mod_args->is_set()) { 4087 // args_in contains -XX:VMOptionsFile and mod_args contains the 4088 // original options from args_in along with the options expanded 4089 // from the VMOptionsFile. Return a short-hand to the caller. 4090 *args_out = mod_args->get(); 4091 } else { 4092 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4093 } 4094 return JNI_OK; 4095 } 4096 4097 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4098 ScopedVMInitArgs* args_out) { 4099 // Remaining part of option string 4100 const char* tail; 4101 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4102 4103 for (int index = 0; index < args->nOptions; index++) { 4104 const JavaVMOption* option = args->options + index; 4105 if (ArgumentsExt::process_options(option)) { 4106 continue; 4107 } 4108 if (match_option(option, "-XX:Flags=", &tail)) { 4109 Arguments::set_jvm_flags_file(tail); 4110 continue; 4111 } 4112 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4113 if (vm_options_file_args.found_vm_options_file_arg()) { 4114 jio_fprintf(defaultStream::error_stream(), 4115 "The option '%s' is already specified in the options " 4116 "container '%s' so the specification of '%s' in the " 4117 "same options container is an error.\n", 4118 vm_options_file_args.vm_options_file_arg(), 4119 vm_options_file_args.container_name(), 4120 option->optionString); 4121 return JNI_EINVAL; 4122 } 4123 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4124 // If there's a VMOptionsFile, parse that 4125 jint code = insert_vm_options_file(args, tail, index, 4126 &vm_options_file_args, args_out); 4127 if (code != JNI_OK) { 4128 return code; 4129 } 4130 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4131 if (args_out->is_set()) { 4132 // The VMOptions file inserted some options so switch 'args' 4133 // to the new set of options, and continue processing which 4134 // preserves "last option wins" semantics. 4135 args = args_out->get(); 4136 // The first option from the VMOptionsFile replaces the 4137 // current option. So we back track to process the 4138 // replacement option. 4139 index--; 4140 } 4141 continue; 4142 } 4143 if (match_option(option, "-XX:+PrintVMOptions")) { 4144 PrintVMOptions = true; 4145 continue; 4146 } 4147 if (match_option(option, "-XX:-PrintVMOptions")) { 4148 PrintVMOptions = false; 4149 continue; 4150 } 4151 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4152 IgnoreUnrecognizedVMOptions = true; 4153 continue; 4154 } 4155 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4156 IgnoreUnrecognizedVMOptions = false; 4157 continue; 4158 } 4159 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4160 CommandLineFlags::printFlags(tty, false); 4161 vm_exit(0); 4162 } 4163 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4164 #if INCLUDE_NMT 4165 // The launcher did not setup nmt environment variable properly. 4166 if (!MemTracker::check_launcher_nmt_support(tail)) { 4167 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4168 } 4169 4170 // Verify if nmt option is valid. 4171 if (MemTracker::verify_nmt_option()) { 4172 // Late initialization, still in single-threaded mode. 4173 if (MemTracker::tracking_level() >= NMT_summary) { 4174 MemTracker::init(); 4175 } 4176 } else { 4177 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4178 } 4179 continue; 4180 #else 4181 jio_fprintf(defaultStream::error_stream(), 4182 "Native Memory Tracking is not supported in this VM\n"); 4183 return JNI_ERR; 4184 #endif 4185 } 4186 4187 #ifndef PRODUCT 4188 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4189 CommandLineFlags::printFlags(tty, true); 4190 vm_exit(0); 4191 } 4192 #endif 4193 } 4194 return JNI_OK; 4195 } 4196 4197 static void print_options(const JavaVMInitArgs *args) { 4198 const char* tail; 4199 for (int index = 0; index < args->nOptions; index++) { 4200 const JavaVMOption *option = args->options + index; 4201 if (match_option(option, "-XX:", &tail)) { 4202 logOption(tail); 4203 } 4204 } 4205 } 4206 4207 bool Arguments::handle_deprecated_print_gc_flags() { 4208 if (PrintGC) { 4209 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4210 } 4211 if (PrintGCDetails) { 4212 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4213 } 4214 4215 if (_gc_log_filename != NULL) { 4216 // -Xloggc was used to specify a filename 4217 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4218 4219 LogTarget(Error, logging) target; 4220 LogStreamCHeap errstream(target); 4221 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4222 } else if (PrintGC || PrintGCDetails) { 4223 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4224 } 4225 return true; 4226 } 4227 4228 void Arguments::handle_extra_cms_flags(const char* msg) { 4229 SpecialFlag flag; 4230 const char *flag_name = "UseConcMarkSweepGC"; 4231 if (lookup_special_flag(flag_name, flag)) { 4232 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4233 warning("%s", msg); 4234 } 4235 } 4236 4237 // Parse entry point called from JNI_CreateJavaVM 4238 4239 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4240 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4241 4242 // Initialize ranges, constraints and writeables 4243 CommandLineFlagRangeList::init(); 4244 CommandLineFlagConstraintList::init(); 4245 CommandLineFlagWriteableList::init(); 4246 4247 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4248 const char* hotspotrc = ".hotspotrc"; 4249 bool settings_file_specified = false; 4250 bool needs_hotspotrc_warning = false; 4251 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4252 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4253 4254 // Pointers to current working set of containers 4255 JavaVMInitArgs* cur_cmd_args; 4256 JavaVMInitArgs* cur_java_options_args; 4257 JavaVMInitArgs* cur_java_tool_options_args; 4258 4259 // Containers for modified/expanded options 4260 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4261 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4262 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4263 4264 4265 jint code = 4266 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4267 if (code != JNI_OK) { 4268 return code; 4269 } 4270 4271 code = parse_java_options_environment_variable(&initial_java_options_args); 4272 if (code != JNI_OK) { 4273 return code; 4274 } 4275 4276 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4277 &mod_java_tool_options_args, 4278 &cur_java_tool_options_args); 4279 if (code != JNI_OK) { 4280 return code; 4281 } 4282 4283 code = expand_vm_options_as_needed(initial_cmd_args, 4284 &mod_cmd_args, 4285 &cur_cmd_args); 4286 if (code != JNI_OK) { 4287 return code; 4288 } 4289 4290 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4291 &mod_java_options_args, 4292 &cur_java_options_args); 4293 if (code != JNI_OK) { 4294 return code; 4295 } 4296 4297 const char* flags_file = Arguments::get_jvm_flags_file(); 4298 settings_file_specified = (flags_file != NULL); 4299 4300 if (IgnoreUnrecognizedVMOptions) { 4301 cur_cmd_args->ignoreUnrecognized = true; 4302 cur_java_tool_options_args->ignoreUnrecognized = true; 4303 cur_java_options_args->ignoreUnrecognized = true; 4304 } 4305 4306 // Parse specified settings file 4307 if (settings_file_specified) { 4308 if (!process_settings_file(flags_file, true, 4309 cur_cmd_args->ignoreUnrecognized)) { 4310 return JNI_EINVAL; 4311 } 4312 } else { 4313 #ifdef ASSERT 4314 // Parse default .hotspotrc settings file 4315 if (!process_settings_file(".hotspotrc", false, 4316 cur_cmd_args->ignoreUnrecognized)) { 4317 return JNI_EINVAL; 4318 } 4319 #else 4320 struct stat buf; 4321 if (os::stat(hotspotrc, &buf) == 0) { 4322 needs_hotspotrc_warning = true; 4323 } 4324 #endif 4325 } 4326 4327 if (PrintVMOptions) { 4328 print_options(cur_java_tool_options_args); 4329 print_options(cur_cmd_args); 4330 print_options(cur_java_options_args); 4331 } 4332 4333 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4334 jint result = parse_vm_init_args(cur_java_tool_options_args, 4335 cur_java_options_args, 4336 cur_cmd_args); 4337 4338 if (result != JNI_OK) { 4339 return result; 4340 } 4341 4342 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4343 SharedArchivePath = get_shared_archive_path(); 4344 if (SharedArchivePath == NULL) { 4345 return JNI_ENOMEM; 4346 } 4347 4348 // Set up VerifySharedSpaces 4349 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4350 VerifySharedSpaces = true; 4351 } 4352 4353 // Delay warning until here so that we've had a chance to process 4354 // the -XX:-PrintWarnings flag 4355 if (needs_hotspotrc_warning) { 4356 warning("%s file is present but has been ignored. " 4357 "Run with -XX:Flags=%s to load the file.", 4358 hotspotrc, hotspotrc); 4359 } 4360 4361 if (needs_module_property_warning) { 4362 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4363 " names that are reserved for internal use."); 4364 } 4365 4366 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4367 UNSUPPORTED_OPTION(UseLargePages); 4368 #endif 4369 4370 ArgumentsExt::report_unsupported_options(); 4371 4372 #ifndef PRODUCT 4373 if (TraceBytecodesAt != 0) { 4374 TraceBytecodes = true; 4375 } 4376 if (CountCompiledCalls) { 4377 if (UseCounterDecay) { 4378 warning("UseCounterDecay disabled because CountCalls is set"); 4379 UseCounterDecay = false; 4380 } 4381 } 4382 #endif // PRODUCT 4383 4384 if (ScavengeRootsInCode == 0) { 4385 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4386 warning("Forcing ScavengeRootsInCode non-zero"); 4387 } 4388 ScavengeRootsInCode = 1; 4389 } 4390 4391 if (!handle_deprecated_print_gc_flags()) { 4392 return JNI_EINVAL; 4393 } 4394 4395 // Set object alignment values. 4396 set_object_alignment(); 4397 4398 #if !INCLUDE_CDS 4399 if (DumpSharedSpaces || RequireSharedSpaces) { 4400 jio_fprintf(defaultStream::error_stream(), 4401 "Shared spaces are not supported in this VM\n"); 4402 return JNI_ERR; 4403 } 4404 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 4405 log_is_enabled(Info, cds)) { 4406 warning("Shared spaces are not supported in this VM"); 4407 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4408 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4409 } 4410 no_shared_spaces("CDS Disabled"); 4411 #endif // INCLUDE_CDS 4412 4413 return JNI_OK; 4414 } 4415 4416 jint Arguments::apply_ergo() { 4417 // Set flags based on ergonomics. 4418 set_ergonomics_flags(); 4419 4420 #if INCLUDE_JVMCI 4421 set_jvmci_specific_flags(); 4422 #endif 4423 4424 set_shared_spaces_flags(); 4425 4426 // Check the GC selections again. 4427 if (!check_gc_consistency()) { 4428 return JNI_EINVAL; 4429 } 4430 4431 if (TieredCompilation) { 4432 set_tiered_flags(); 4433 } else { 4434 int max_compilation_policy_choice = 1; 4435 #ifdef COMPILER2 4436 if (is_server_compilation_mode_vm()) { 4437 max_compilation_policy_choice = 2; 4438 } 4439 #endif 4440 // Check if the policy is valid. 4441 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4442 vm_exit_during_initialization( 4443 "Incompatible compilation policy selected", NULL); 4444 } 4445 // Scale CompileThreshold 4446 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4447 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4448 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4449 } 4450 } 4451 4452 #ifdef COMPILER2 4453 #ifndef PRODUCT 4454 if (PrintIdealGraphLevel > 0) { 4455 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4456 } 4457 #endif 4458 #endif 4459 4460 // Set heap size based on available physical memory 4461 set_heap_size(); 4462 4463 ArgumentsExt::set_gc_specific_flags(); 4464 4465 // Initialize Metaspace flags and alignments 4466 Metaspace::ergo_initialize(); 4467 4468 // Set bytecode rewriting flags 4469 set_bytecode_flags(); 4470 4471 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4472 jint code = set_aggressive_opts_flags(); 4473 if (code != JNI_OK) { 4474 return code; 4475 } 4476 4477 // Turn off biased locking for locking debug mode flags, 4478 // which are subtly different from each other but neither works with 4479 // biased locking 4480 if (UseHeavyMonitors 4481 #ifdef COMPILER1 4482 || !UseFastLocking 4483 #endif // COMPILER1 4484 #if INCLUDE_JVMCI 4485 || !JVMCIUseFastLocking 4486 #endif 4487 ) { 4488 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4489 // flag set to true on command line; warn the user that they 4490 // can't enable biased locking here 4491 warning("Biased Locking is not supported with locking debug flags" 4492 "; ignoring UseBiasedLocking flag." ); 4493 } 4494 UseBiasedLocking = false; 4495 } 4496 4497 #ifdef CC_INTERP 4498 // Clear flags not supported on zero. 4499 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4500 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4501 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4502 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4503 #endif // CC_INTERP 4504 4505 #ifdef COMPILER2 4506 if (!EliminateLocks) { 4507 EliminateNestedLocks = false; 4508 } 4509 if (!Inline) { 4510 IncrementalInline = false; 4511 } 4512 #ifndef PRODUCT 4513 if (!IncrementalInline) { 4514 AlwaysIncrementalInline = false; 4515 } 4516 #endif 4517 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4518 // nothing to use the profiling, turn if off 4519 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4520 } 4521 #endif 4522 4523 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4524 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4525 DebugNonSafepoints = true; 4526 } 4527 4528 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4529 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4530 } 4531 4532 if (UseOnStackReplacement && !UseLoopCounter) { 4533 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4534 FLAG_SET_DEFAULT(UseLoopCounter, true); 4535 } 4536 4537 #ifndef PRODUCT 4538 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4539 if (use_vm_log()) { 4540 LogVMOutput = true; 4541 } 4542 } 4543 #endif // PRODUCT 4544 4545 if (PrintCommandLineFlags) { 4546 CommandLineFlags::printSetFlags(tty); 4547 } 4548 4549 // Apply CPU specific policy for the BiasedLocking 4550 if (UseBiasedLocking) { 4551 if (!VM_Version::use_biased_locking() && 4552 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4553 UseBiasedLocking = false; 4554 } 4555 } 4556 #ifdef COMPILER2 4557 if (!UseBiasedLocking || EmitSync != 0) { 4558 UseOptoBiasInlining = false; 4559 } 4560 #endif 4561 4562 return JNI_OK; 4563 } 4564 4565 jint Arguments::adjust_after_os() { 4566 if (UseNUMA) { 4567 if (UseParallelGC || UseParallelOldGC) { 4568 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4569 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4570 } 4571 } 4572 // UseNUMAInterleaving is set to ON for all collectors and 4573 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4574 // such as the parallel collector for Linux and Solaris will 4575 // interleave old gen and survivor spaces on top of NUMA 4576 // allocation policy for the eden space. 4577 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4578 // all platforms and ParallelGC on Windows will interleave all 4579 // of the heap spaces across NUMA nodes. 4580 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4581 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4582 } 4583 } 4584 return JNI_OK; 4585 } 4586 4587 int Arguments::PropertyList_count(SystemProperty* pl) { 4588 int count = 0; 4589 while(pl != NULL) { 4590 count++; 4591 pl = pl->next(); 4592 } 4593 return count; 4594 } 4595 4596 // Return the number of readable properties. 4597 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4598 int count = 0; 4599 while(pl != NULL) { 4600 if (pl->is_readable()) { 4601 count++; 4602 } 4603 pl = pl->next(); 4604 } 4605 return count; 4606 } 4607 4608 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4609 assert(key != NULL, "just checking"); 4610 SystemProperty* prop; 4611 for (prop = pl; prop != NULL; prop = prop->next()) { 4612 if (strcmp(key, prop->key()) == 0) return prop->value(); 4613 } 4614 return NULL; 4615 } 4616 4617 // Return the value of the requested property provided that it is a readable property. 4618 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4619 assert(key != NULL, "just checking"); 4620 SystemProperty* prop; 4621 // Return the property value if the keys match and the property is not internal or 4622 // it's the special internal property "jdk.boot.class.path.append". 4623 for (prop = pl; prop != NULL; prop = prop->next()) { 4624 if (strcmp(key, prop->key()) == 0) { 4625 if (!prop->internal()) { 4626 return prop->value(); 4627 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4628 return prop->value(); 4629 } else { 4630 // Property is internal and not jdk.boot.class.path.append so return NULL. 4631 return NULL; 4632 } 4633 } 4634 } 4635 return NULL; 4636 } 4637 4638 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4639 int count = 0; 4640 const char* ret_val = NULL; 4641 4642 while(pl != NULL) { 4643 if(count >= index) { 4644 ret_val = pl->key(); 4645 break; 4646 } 4647 count++; 4648 pl = pl->next(); 4649 } 4650 4651 return ret_val; 4652 } 4653 4654 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4655 int count = 0; 4656 char* ret_val = NULL; 4657 4658 while(pl != NULL) { 4659 if(count >= index) { 4660 ret_val = pl->value(); 4661 break; 4662 } 4663 count++; 4664 pl = pl->next(); 4665 } 4666 4667 return ret_val; 4668 } 4669 4670 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4671 SystemProperty* p = *plist; 4672 if (p == NULL) { 4673 *plist = new_p; 4674 } else { 4675 while (p->next() != NULL) { 4676 p = p->next(); 4677 } 4678 p->set_next(new_p); 4679 } 4680 } 4681 4682 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4683 bool writeable, bool internal) { 4684 if (plist == NULL) 4685 return; 4686 4687 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4688 PropertyList_add(plist, new_p); 4689 } 4690 4691 void Arguments::PropertyList_add(SystemProperty *element) { 4692 PropertyList_add(&_system_properties, element); 4693 } 4694 4695 // This add maintains unique property key in the list. 4696 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4697 PropertyAppendable append, PropertyWriteable writeable, 4698 PropertyInternal internal) { 4699 if (plist == NULL) 4700 return; 4701 4702 // If property key exist then update with new value. 4703 SystemProperty* prop; 4704 for (prop = *plist; prop != NULL; prop = prop->next()) { 4705 if (strcmp(k, prop->key()) == 0) { 4706 if (append == AppendProperty) { 4707 prop->append_value(v); 4708 } else { 4709 prop->set_value(v); 4710 } 4711 return; 4712 } 4713 } 4714 4715 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4716 } 4717 4718 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4719 // Returns true if all of the source pointed by src has been copied over to 4720 // the destination buffer pointed by buf. Otherwise, returns false. 4721 // Notes: 4722 // 1. If the length (buflen) of the destination buffer excluding the 4723 // NULL terminator character is not long enough for holding the expanded 4724 // pid characters, it also returns false instead of returning the partially 4725 // expanded one. 4726 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4727 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4728 char* buf, size_t buflen) { 4729 const char* p = src; 4730 char* b = buf; 4731 const char* src_end = &src[srclen]; 4732 char* buf_end = &buf[buflen - 1]; 4733 4734 while (p < src_end && b < buf_end) { 4735 if (*p == '%') { 4736 switch (*(++p)) { 4737 case '%': // "%%" ==> "%" 4738 *b++ = *p++; 4739 break; 4740 case 'p': { // "%p" ==> current process id 4741 // buf_end points to the character before the last character so 4742 // that we could write '\0' to the end of the buffer. 4743 size_t buf_sz = buf_end - b + 1; 4744 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4745 4746 // if jio_snprintf fails or the buffer is not long enough to hold 4747 // the expanded pid, returns false. 4748 if (ret < 0 || ret >= (int)buf_sz) { 4749 return false; 4750 } else { 4751 b += ret; 4752 assert(*b == '\0', "fail in copy_expand_pid"); 4753 if (p == src_end && b == buf_end + 1) { 4754 // reach the end of the buffer. 4755 return true; 4756 } 4757 } 4758 p++; 4759 break; 4760 } 4761 default : 4762 *b++ = '%'; 4763 } 4764 } else { 4765 *b++ = *p++; 4766 } 4767 } 4768 *b = '\0'; 4769 return (p == src_end); // return false if not all of the source was copied 4770 }