1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/moduleEntry.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genCollectedHeap.hpp" 33 #include "gc/shared/referenceProcessor.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/arguments_ext.hpp" 45 #include "runtime/commandLineFlagConstraintList.hpp" 46 #include "runtime/commandLineFlagWriteableList.hpp" 47 #include "runtime/commandLineFlagRangeList.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/globals_extension.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/defaultStream.hpp" 56 #include "utilities/macros.hpp" 57 #include "utilities/stringUtils.hpp" 58 #if INCLUDE_JVMCI 59 #include "jvmci/jvmciRuntime.hpp" 60 #endif 61 #if INCLUDE_ALL_GCS 62 #include "gc/cms/compactibleFreeListSpace.hpp" 63 #include "gc/g1/g1CollectedHeap.inline.hpp" 64 #include "gc/parallel/parallelScavengeHeap.hpp" 65 #endif // INCLUDE_ALL_GCS 66 67 // Note: This is a special bug reporting site for the JVM 68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 bool Arguments::_has_profile = false; 80 size_t Arguments::_conservative_max_heap_alignment = 0; 81 size_t Arguments::_min_heap_size = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args() 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98 char* Arguments::SharedArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 abort_hook_t Arguments::_abort_hook = NULL; 104 exit_hook_t Arguments::_exit_hook = NULL; 105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108 SystemProperty *Arguments::_sun_boot_library_path = NULL; 109 SystemProperty *Arguments::_java_library_path = NULL; 110 SystemProperty *Arguments::_java_home = NULL; 111 SystemProperty *Arguments::_java_class_path = NULL; 112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 113 114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 115 PathString *Arguments::_system_boot_class_path = NULL; 116 bool Arguments::_has_jimage = false; 117 118 char* Arguments::_ext_dirs = NULL; 119 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 121 // part of the option string. 122 static bool match_option(const JavaVMOption *option, const char* name, 123 const char** tail) { 124 size_t len = strlen(name); 125 if (strncmp(option->optionString, name, len) == 0) { 126 *tail = option->optionString + len; 127 return true; 128 } else { 129 return false; 130 } 131 } 132 133 // Check if 'option' matches 'name'. No "tail" is allowed. 134 static bool match_option(const JavaVMOption *option, const char* name) { 135 const char* tail = NULL; 136 bool result = match_option(option, name, &tail); 137 if (tail != NULL && *tail == '\0') { 138 return result; 139 } else { 140 return false; 141 } 142 } 143 144 // Return true if any of the strings in null-terminated array 'names' matches. 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 146 // the option must match exactly. 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 148 bool tail_allowed) { 149 for (/* empty */; *names != NULL; ++names) { 150 if (match_option(option, *names, tail)) { 151 if (**tail == '\0' || tail_allowed && **tail == ':') { 152 return true; 153 } 154 } 155 } 156 return false; 157 } 158 159 static void logOption(const char* opt) { 160 if (PrintVMOptions) { 161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 162 } 163 } 164 165 bool needs_module_property_warning = false; 166 167 #define MODULE_PROPERTY_PREFIX "jdk.module." 168 #define MODULE_PROPERTY_PREFIX_LEN 11 169 #define ADDEXPORTS "addexports" 170 #define ADDEXPORTS_LEN 10 171 #define ADDREADS "addreads" 172 #define ADDREADS_LEN 8 173 #define ADDOPENS "addopens" 174 #define ADDOPENS_LEN 8 175 #define PATCH "patch" 176 #define PATCH_LEN 5 177 #define ADDMODS "addmods" 178 #define ADDMODS_LEN 7 179 #define LIMITMODS "limitmods" 180 #define LIMITMODS_LEN 9 181 #define PATH "path" 182 #define PATH_LEN 4 183 #define UPGRADE_PATH "upgrade.path" 184 #define UPGRADE_PATH_LEN 12 185 186 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 187 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 188 return ((strncmp(option, property, len) == 0) && 189 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 190 } 191 192 // Return true if property starts with "jdk.module." and its ensuing chars match 193 // any of the reserved module properties. 194 // property should be passed without the leading "-D". 195 bool Arguments::is_internal_module_property(const char* property) { 196 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 197 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 198 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 199 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 200 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 201 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 202 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 203 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 204 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 205 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 206 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 207 return true; 208 } 209 } 210 return false; 211 } 212 213 // Process java launcher properties. 214 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 215 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 216 // sun.java.launcher.pid is defined. 217 // Must do this before setting up other system properties, 218 // as some of them may depend on launcher type. 219 for (int index = 0; index < args->nOptions; index++) { 220 const JavaVMOption* option = args->options + index; 221 const char* tail; 222 223 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 224 process_java_launcher_argument(tail, option->extraInfo); 225 continue; 226 } 227 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 228 if (strcmp(tail, "true") == 0) { 229 _sun_java_launcher_is_altjvm = true; 230 } 231 continue; 232 } 233 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 234 _sun_java_launcher_pid = atoi(tail); 235 continue; 236 } 237 } 238 } 239 240 // Initialize system properties key and value. 241 void Arguments::init_system_properties() { 242 243 // Set up _system_boot_class_path which is not a property but 244 // relies heavily on argument processing and the jdk.boot.class.path.append 245 // property. It is used to store the underlying system boot class path. 246 _system_boot_class_path = new PathString(NULL); 247 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 249 "Java Virtual Machine Specification", false)); 250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 253 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 254 255 // Following are JVMTI agent writable properties. 256 // Properties values are set to NULL and they are 257 // os specific they are initialized in os::init_system_properties_values(). 258 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 259 _java_library_path = new SystemProperty("java.library.path", NULL, true); 260 _java_home = new SystemProperty("java.home", NULL, true); 261 _java_class_path = new SystemProperty("java.class.path", "", true); 262 // jdk.boot.class.path.append is a non-writeable, internal property. 263 // It can only be set by either: 264 // - -Xbootclasspath/a: 265 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 266 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 267 268 // Add to System Property list. 269 PropertyList_add(&_system_properties, _sun_boot_library_path); 270 PropertyList_add(&_system_properties, _java_library_path); 271 PropertyList_add(&_system_properties, _java_home); 272 PropertyList_add(&_system_properties, _java_class_path); 273 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 274 275 // Set OS specific system properties values 276 os::init_system_properties_values(); 277 } 278 279 // Update/Initialize System properties after JDK version number is known 280 void Arguments::init_version_specific_system_properties() { 281 enum { bufsz = 16 }; 282 char buffer[bufsz]; 283 const char* spec_vendor = "Oracle Corporation"; 284 uint32_t spec_version = JDK_Version::current().major_version(); 285 286 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 287 288 PropertyList_add(&_system_properties, 289 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 290 PropertyList_add(&_system_properties, 291 new SystemProperty("java.vm.specification.version", buffer, false)); 292 PropertyList_add(&_system_properties, 293 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 294 } 295 296 /* 297 * -XX argument processing: 298 * 299 * -XX arguments are defined in several places, such as: 300 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 301 * -XX arguments are parsed in parse_argument(). 302 * -XX argument bounds checking is done in check_vm_args_consistency(). 303 * 304 * Over time -XX arguments may change. There are mechanisms to handle common cases: 305 * 306 * ALIASED: An option that is simply another name for another option. This is often 307 * part of the process of deprecating a flag, but not all aliases need 308 * to be deprecated. 309 * 310 * Create an alias for an option by adding the old and new option names to the 311 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 312 * 313 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 314 * support may be removed in the future. Both regular and aliased options may be 315 * deprecated. 316 * 317 * Add a deprecation warning for an option (or alias) by adding an entry in the 318 * "special_jvm_flags" table and setting the "deprecated_in" field. 319 * Often an option "deprecated" in one major release will 320 * be made "obsolete" in the next. In this case the entry should also have it's 321 * "obsolete_in" field set. 322 * 323 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 324 * on the command line. A warning is printed to let the user know that option might not 325 * be accepted in the future. 326 * 327 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 328 * table and setting the "obsolete_in" field. 329 * 330 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 331 * to the current JDK version. The system will flatly refuse to admit the existence of 332 * the flag. This allows a flag to die automatically over JDK releases. 333 * 334 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 335 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 336 * - Newly obsolete or expired deprecated options should have their global variable 337 * definitions removed (from globals.hpp, etc) and related implementations removed. 338 * 339 * Recommended approach for removing options: 340 * 341 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 342 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 343 * 344 * To remove internal options (e.g. diagnostic, experimental, develop options), use 345 * a 2-step model adding major release numbers to the obsolete and expire columns. 346 * 347 * To change the name of an option, use the alias table as well as a 2-step 348 * model adding major release numbers to the deprecate and expire columns. 349 * Think twice about aliasing commonly used customer options. 350 * 351 * There are times when it is appropriate to leave a future release number as undefined. 352 * 353 * Tests: Aliases should be tested in VMAliasOptions.java. 354 * Deprecated options should be tested in VMDeprecatedOptions.java. 355 */ 356 357 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 358 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 359 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 360 // the command-line as usual, but will issue a warning. 361 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 362 // the command-line, while issuing a warning and ignoring the flag value. 363 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 364 // existence of the flag. 365 // 366 // MANUAL CLEANUP ON JDK VERSION UPDATES: 367 // This table ensures that the handling of options will update automatically when the JDK 368 // version is incremented, but the source code needs to be cleanup up manually: 369 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 370 // variable should be removed, as well as users of the variable. 371 // - As "deprecated" options age into "obsolete" options, move the entry into the 372 // "Obsolete Flags" section of the table. 373 // - All expired options should be removed from the table. 374 static SpecialFlag const special_jvm_flags[] = { 375 // -------------- Deprecated Flags -------------- 376 // --- Non-alias flags - sorted by obsolete_in then expired_in: 377 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 378 379 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 380 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 381 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 382 383 // -------------- Obsolete Flags - sorted by expired_in -------------- 384 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 385 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 386 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 387 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 388 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 389 390 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 391 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 392 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 393 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 394 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 395 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 396 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 397 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 398 #endif 399 400 { NULL, JDK_Version(0), JDK_Version(0) } 401 }; 402 403 // Flags that are aliases for other flags. 404 typedef struct { 405 const char* alias_name; 406 const char* real_name; 407 } AliasedFlag; 408 409 static AliasedFlag const aliased_jvm_flags[] = { 410 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 411 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 412 { NULL, NULL} 413 }; 414 415 // NOTE: A compatibility request will be necessary for each alias to be removed. 416 static AliasedLoggingFlag const aliased_logging_flags[] = { 417 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 418 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 419 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 420 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 421 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 422 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 423 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 424 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 425 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 426 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 427 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 428 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 429 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 430 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 431 }; 432 433 #ifndef PRODUCT 434 // These options are removed in jdk9. Remove this code for jdk10. 435 static AliasedFlag const removed_develop_logging_flags[] = { 436 { "TraceClassInitialization", "-Xlog:class+init" }, 437 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 438 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 439 { "TraceItables", "-Xlog:itables=debug" }, 440 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 441 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 442 { "TraceStartupTime", "-Xlog:startuptime" }, 443 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 444 { "PrintVtables", "-Xlog:vtables=debug" }, 445 { "VerboseVerification", "-Xlog:verification" }, 446 { NULL, NULL } 447 }; 448 #endif //PRODUCT 449 450 // Return true if "v" is less than "other", where "other" may be "undefined". 451 static bool version_less_than(JDK_Version v, JDK_Version other) { 452 assert(!v.is_undefined(), "must be defined"); 453 if (!other.is_undefined() && v.compare(other) >= 0) { 454 return false; 455 } else { 456 return true; 457 } 458 } 459 460 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 461 462 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 463 // Allow extensions to have priority 464 if (lookup_special_flag_ext(flag_name, flag)) { 465 return true; 466 } 467 468 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 469 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 470 flag = special_jvm_flags[i]; 471 return true; 472 } 473 } 474 return false; 475 } 476 477 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 478 assert(version != NULL, "Must provide a version buffer"); 479 SpecialFlag flag; 480 if (lookup_special_flag(flag_name, flag)) { 481 if (!flag.obsolete_in.is_undefined()) { 482 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 483 *version = flag.obsolete_in; 484 return true; 485 } 486 } 487 } 488 return false; 489 } 490 491 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 492 assert(version != NULL, "Must provide a version buffer"); 493 SpecialFlag flag; 494 if (lookup_special_flag(flag_name, flag)) { 495 if (!flag.deprecated_in.is_undefined()) { 496 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 497 version_less_than(JDK_Version::current(), flag.expired_in)) { 498 *version = flag.deprecated_in; 499 return 1; 500 } else { 501 return -1; 502 } 503 } 504 } 505 return 0; 506 } 507 508 #ifndef PRODUCT 509 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 510 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 511 const AliasedFlag& flag = removed_develop_logging_flags[i]; 512 if (strcmp(flag.alias_name, name) == 0) { 513 return flag.real_name; 514 } 515 } 516 return NULL; 517 } 518 #endif // PRODUCT 519 520 const char* Arguments::real_flag_name(const char *flag_name) { 521 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 522 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 523 if (strcmp(flag_status.alias_name, flag_name) == 0) { 524 return flag_status.real_name; 525 } 526 } 527 return flag_name; 528 } 529 530 #ifdef ASSERT 531 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 532 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 533 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 534 return true; 535 } 536 } 537 return false; 538 } 539 540 static bool verify_special_jvm_flags() { 541 bool success = true; 542 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 543 const SpecialFlag& flag = special_jvm_flags[i]; 544 if (lookup_special_flag(flag.name, i)) { 545 warning("Duplicate special flag declaration \"%s\"", flag.name); 546 success = false; 547 } 548 if (flag.deprecated_in.is_undefined() && 549 flag.obsolete_in.is_undefined()) { 550 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 551 success = false; 552 } 553 554 if (!flag.deprecated_in.is_undefined()) { 555 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 556 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 557 success = false; 558 } 559 560 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 561 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 562 success = false; 563 } 564 } 565 566 if (!flag.obsolete_in.is_undefined()) { 567 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 568 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 569 success = false; 570 } 571 572 // if flag has become obsolete it should not have a "globals" flag defined anymore. 573 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 574 if (Flag::find_flag(flag.name) != NULL) { 575 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 576 success = false; 577 } 578 } 579 } 580 581 if (!flag.expired_in.is_undefined()) { 582 // if flag has become expired it should not have a "globals" flag defined anymore. 583 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 584 if (Flag::find_flag(flag.name) != NULL) { 585 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 586 success = false; 587 } 588 } 589 } 590 591 } 592 return success; 593 } 594 #endif 595 596 // Parses a size specification string. 597 bool Arguments::atojulong(const char *s, julong* result) { 598 julong n = 0; 599 600 // First char must be a digit. Don't allow negative numbers or leading spaces. 601 if (!isdigit(*s)) { 602 return false; 603 } 604 605 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 606 char* remainder; 607 errno = 0; 608 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 609 if (errno != 0) { 610 return false; 611 } 612 613 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 614 if (remainder == s || strlen(remainder) > 1) { 615 return false; 616 } 617 618 switch (*remainder) { 619 case 'T': case 't': 620 *result = n * G * K; 621 // Check for overflow. 622 if (*result/((julong)G * K) != n) return false; 623 return true; 624 case 'G': case 'g': 625 *result = n * G; 626 if (*result/G != n) return false; 627 return true; 628 case 'M': case 'm': 629 *result = n * M; 630 if (*result/M != n) return false; 631 return true; 632 case 'K': case 'k': 633 *result = n * K; 634 if (*result/K != n) return false; 635 return true; 636 case '\0': 637 *result = n; 638 return true; 639 default: 640 return false; 641 } 642 } 643 644 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 645 if (size < min_size) return arg_too_small; 646 // Check that size will fit in a size_t (only relevant on 32-bit) 647 if (size > max_uintx) return arg_too_big; 648 return arg_in_range; 649 } 650 651 // Describe an argument out of range error 652 void Arguments::describe_range_error(ArgsRange errcode) { 653 switch(errcode) { 654 case arg_too_big: 655 jio_fprintf(defaultStream::error_stream(), 656 "The specified size exceeds the maximum " 657 "representable size.\n"); 658 break; 659 case arg_too_small: 660 case arg_unreadable: 661 case arg_in_range: 662 // do nothing for now 663 break; 664 default: 665 ShouldNotReachHere(); 666 } 667 } 668 669 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 670 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 671 return true; 672 } else { 673 return false; 674 } 675 } 676 677 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 678 char* end; 679 errno = 0; 680 double v = strtod(value, &end); 681 if ((errno != 0) || (*end != 0)) { 682 return false; 683 } 684 685 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 686 return true; 687 } 688 return false; 689 } 690 691 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 692 julong v; 693 int int_v; 694 intx intx_v; 695 bool is_neg = false; 696 Flag* result = Flag::find_flag(name, strlen(name)); 697 698 if (result == NULL) { 699 return false; 700 } 701 702 // Check the sign first since atojulong() parses only unsigned values. 703 if (*value == '-') { 704 if (!result->is_intx() && !result->is_int()) { 705 return false; 706 } 707 value++; 708 is_neg = true; 709 } 710 if (!Arguments::atojulong(value, &v)) { 711 return false; 712 } 713 if (result->is_int()) { 714 int_v = (int) v; 715 if (is_neg) { 716 int_v = -int_v; 717 } 718 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 719 } else if (result->is_uint()) { 720 uint uint_v = (uint) v; 721 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 722 } else if (result->is_intx()) { 723 intx_v = (intx) v; 724 if (is_neg) { 725 intx_v = -intx_v; 726 } 727 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 728 } else if (result->is_uintx()) { 729 uintx uintx_v = (uintx) v; 730 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 731 } else if (result->is_uint64_t()) { 732 uint64_t uint64_t_v = (uint64_t) v; 733 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 734 } else if (result->is_size_t()) { 735 size_t size_t_v = (size_t) v; 736 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 737 } else { 738 return false; 739 } 740 } 741 742 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 743 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 744 // Contract: CommandLineFlags always returns a pointer that needs freeing. 745 FREE_C_HEAP_ARRAY(char, value); 746 return true; 747 } 748 749 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 750 const char* old_value = ""; 751 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 752 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 753 size_t new_len = strlen(new_value); 754 const char* value; 755 char* free_this_too = NULL; 756 if (old_len == 0) { 757 value = new_value; 758 } else if (new_len == 0) { 759 value = old_value; 760 } else { 761 size_t length = old_len + 1 + new_len + 1; 762 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 763 // each new setting adds another LINE to the switch: 764 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 765 value = buf; 766 free_this_too = buf; 767 } 768 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 769 // CommandLineFlags always returns a pointer that needs freeing. 770 FREE_C_HEAP_ARRAY(char, value); 771 if (free_this_too != NULL) { 772 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 773 FREE_C_HEAP_ARRAY(char, free_this_too); 774 } 775 return true; 776 } 777 778 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 779 const char* real_name = real_flag_name(arg); 780 JDK_Version since = JDK_Version(); 781 switch (is_deprecated_flag(arg, &since)) { 782 case -1: 783 return NULL; // obsolete or expired, don't process normally 784 case 0: 785 return real_name; 786 case 1: { 787 if (warn) { 788 char version[256]; 789 since.to_string(version, sizeof(version)); 790 if (real_name != arg) { 791 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 792 arg, version, real_name); 793 } else { 794 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 795 arg, version); 796 } 797 } 798 return real_name; 799 } 800 } 801 ShouldNotReachHere(); 802 return NULL; 803 } 804 805 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 806 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 807 // Set tagset string buffer at max size of 256, large enough for any alias tagset 808 const int max_tagset_size = 256; 809 int max_tagset_len = max_tagset_size - 1; 810 char tagset_buffer[max_tagset_size]; 811 tagset_buffer[0] = '\0'; 812 813 // Write tag-set for aliased logging option, in string list form 814 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 815 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 816 if (i > 0) { 817 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 818 } 819 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 820 } 821 if (!alf.exactMatch) { 822 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 823 } 824 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 825 (on) ? "+" : "-", 826 name, 827 tagset_buffer, 828 (on) ? LogLevel::name(alf.level) : "off"); 829 } 830 831 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 832 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 833 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 834 if (strcmp(alf.alias_name, name) == 0) { 835 log_deprecated_flag(name, on, alf); 836 return alf; 837 } 838 } 839 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 840 return a; 841 } 842 843 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 844 845 // range of acceptable characters spelled out for portability reasons 846 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 847 #define BUFLEN 255 848 char name[BUFLEN+1]; 849 char dummy; 850 const char* real_name; 851 bool warn_if_deprecated = true; 852 853 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 854 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 855 if (alf.alias_name != NULL){ 856 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 857 return true; 858 } 859 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 860 if (real_name == NULL) { 861 return false; 862 } 863 return set_bool_flag(real_name, false, origin); 864 } 865 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 866 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 867 if (alf.alias_name != NULL){ 868 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 869 return true; 870 } 871 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 872 if (real_name == NULL) { 873 return false; 874 } 875 return set_bool_flag(real_name, true, origin); 876 } 877 878 char punct; 879 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 880 const char* value = strchr(arg, '=') + 1; 881 Flag* flag; 882 883 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 884 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 885 if (alf.alias_name != NULL) { 886 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 887 return true; 888 } 889 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 890 if (real_name == NULL) { 891 return false; 892 } 893 flag = Flag::find_flag(real_name); 894 if (flag != NULL && flag->is_ccstr()) { 895 if (flag->ccstr_accumulates()) { 896 return append_to_string_flag(real_name, value, origin); 897 } else { 898 if (value[0] == '\0') { 899 value = NULL; 900 } 901 return set_string_flag(real_name, value, origin); 902 } 903 } else { 904 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 905 } 906 } 907 908 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 909 const char* value = strchr(arg, '=') + 1; 910 // -XX:Foo:=xxx will reset the string flag to the given value. 911 if (value[0] == '\0') { 912 value = NULL; 913 } 914 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 915 if (real_name == NULL) { 916 return false; 917 } 918 return set_string_flag(real_name, value, origin); 919 } 920 921 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 922 #define SIGNED_NUMBER_RANGE "[-0123456789]" 923 #define NUMBER_RANGE "[0123456789eE+-]" 924 char value[BUFLEN + 1]; 925 char value2[BUFLEN + 1]; 926 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 927 // Looks like a floating-point number -- try again with more lenient format string 928 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 929 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 930 if (real_name == NULL) { 931 return false; 932 } 933 return set_fp_numeric_flag(real_name, value, origin); 934 } 935 } 936 937 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 938 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 939 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 940 if (real_name == NULL) { 941 return false; 942 } 943 return set_numeric_flag(real_name, value, origin); 944 } 945 946 return false; 947 } 948 949 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 950 assert(bldarray != NULL, "illegal argument"); 951 952 if (arg == NULL) { 953 return; 954 } 955 956 int new_count = *count + 1; 957 958 // expand the array and add arg to the last element 959 if (*bldarray == NULL) { 960 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 961 } else { 962 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 963 } 964 (*bldarray)[*count] = os::strdup_check_oom(arg); 965 *count = new_count; 966 } 967 968 void Arguments::build_jvm_args(const char* arg) { 969 add_string(&_jvm_args_array, &_num_jvm_args, arg); 970 } 971 972 void Arguments::build_jvm_flags(const char* arg) { 973 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 974 } 975 976 // utility function to return a string that concatenates all 977 // strings in a given char** array 978 const char* Arguments::build_resource_string(char** args, int count) { 979 if (args == NULL || count == 0) { 980 return NULL; 981 } 982 size_t length = 0; 983 for (int i = 0; i < count; i++) { 984 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 985 } 986 char* s = NEW_RESOURCE_ARRAY(char, length); 987 char* dst = s; 988 for (int j = 0; j < count; j++) { 989 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 990 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 991 dst += offset; 992 length -= offset; 993 } 994 return (const char*) s; 995 } 996 997 void Arguments::print_on(outputStream* st) { 998 st->print_cr("VM Arguments:"); 999 if (num_jvm_flags() > 0) { 1000 st->print("jvm_flags: "); print_jvm_flags_on(st); 1001 st->cr(); 1002 } 1003 if (num_jvm_args() > 0) { 1004 st->print("jvm_args: "); print_jvm_args_on(st); 1005 st->cr(); 1006 } 1007 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1008 if (_java_class_path != NULL) { 1009 char* path = _java_class_path->value(); 1010 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1011 } 1012 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1013 } 1014 1015 void Arguments::print_summary_on(outputStream* st) { 1016 // Print the command line. Environment variables that are helpful for 1017 // reproducing the problem are written later in the hs_err file. 1018 // flags are from setting file 1019 if (num_jvm_flags() > 0) { 1020 st->print_raw("Settings File: "); 1021 print_jvm_flags_on(st); 1022 st->cr(); 1023 } 1024 // args are the command line and environment variable arguments. 1025 st->print_raw("Command Line: "); 1026 if (num_jvm_args() > 0) { 1027 print_jvm_args_on(st); 1028 } 1029 // this is the classfile and any arguments to the java program 1030 if (java_command() != NULL) { 1031 st->print("%s", java_command()); 1032 } 1033 st->cr(); 1034 } 1035 1036 void Arguments::print_jvm_flags_on(outputStream* st) { 1037 if (_num_jvm_flags > 0) { 1038 for (int i=0; i < _num_jvm_flags; i++) { 1039 st->print("%s ", _jvm_flags_array[i]); 1040 } 1041 } 1042 } 1043 1044 void Arguments::print_jvm_args_on(outputStream* st) { 1045 if (_num_jvm_args > 0) { 1046 for (int i=0; i < _num_jvm_args; i++) { 1047 st->print("%s ", _jvm_args_array[i]); 1048 } 1049 } 1050 } 1051 1052 bool Arguments::process_argument(const char* arg, 1053 jboolean ignore_unrecognized, 1054 Flag::Flags origin) { 1055 JDK_Version since = JDK_Version(); 1056 1057 if (parse_argument(arg, origin)) { 1058 return true; 1059 } 1060 1061 // Determine if the flag has '+', '-', or '=' characters. 1062 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1063 const char* const argname = has_plus_minus ? arg + 1 : arg; 1064 1065 size_t arg_len; 1066 const char* equal_sign = strchr(argname, '='); 1067 if (equal_sign == NULL) { 1068 arg_len = strlen(argname); 1069 } else { 1070 arg_len = equal_sign - argname; 1071 } 1072 1073 // Only make the obsolete check for valid arguments. 1074 if (arg_len <= BUFLEN) { 1075 // Construct a string which consists only of the argument name without '+', '-', or '='. 1076 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1077 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1078 if (is_obsolete_flag(stripped_argname, &since)) { 1079 char version[256]; 1080 since.to_string(version, sizeof(version)); 1081 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1082 return true; 1083 } 1084 #ifndef PRODUCT 1085 else { 1086 const char* replacement; 1087 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1088 log_warning(arguments)("%s has been removed. Please use %s instead.", 1089 stripped_argname, 1090 replacement); 1091 return false; 1092 } 1093 } 1094 #endif //PRODUCT 1095 } 1096 1097 // For locked flags, report a custom error message if available. 1098 // Otherwise, report the standard unrecognized VM option. 1099 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1100 if (found_flag != NULL) { 1101 char locked_message_buf[BUFLEN]; 1102 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1103 if (strlen(locked_message_buf) == 0) { 1104 if (found_flag->is_bool() && !has_plus_minus) { 1105 jio_fprintf(defaultStream::error_stream(), 1106 "Missing +/- setting for VM option '%s'\n", argname); 1107 } else if (!found_flag->is_bool() && has_plus_minus) { 1108 jio_fprintf(defaultStream::error_stream(), 1109 "Unexpected +/- setting in VM option '%s'\n", argname); 1110 } else { 1111 jio_fprintf(defaultStream::error_stream(), 1112 "Improperly specified VM option '%s'\n", argname); 1113 } 1114 } else { 1115 #ifdef PRODUCT 1116 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1117 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1118 if (ignore_unrecognized && mismatched) { 1119 return true; 1120 } 1121 #endif 1122 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1123 } 1124 } else { 1125 if (ignore_unrecognized) { 1126 return true; 1127 } 1128 jio_fprintf(defaultStream::error_stream(), 1129 "Unrecognized VM option '%s'\n", argname); 1130 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1131 if (fuzzy_matched != NULL) { 1132 jio_fprintf(defaultStream::error_stream(), 1133 "Did you mean '%s%s%s'? ", 1134 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1135 fuzzy_matched->_name, 1136 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1137 } 1138 } 1139 1140 // allow for commandline "commenting out" options like -XX:#+Verbose 1141 return arg[0] == '#'; 1142 } 1143 1144 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1145 FILE* stream = fopen(file_name, "rb"); 1146 if (stream == NULL) { 1147 if (should_exist) { 1148 jio_fprintf(defaultStream::error_stream(), 1149 "Could not open settings file %s\n", file_name); 1150 return false; 1151 } else { 1152 return true; 1153 } 1154 } 1155 1156 char token[1024]; 1157 int pos = 0; 1158 1159 bool in_white_space = true; 1160 bool in_comment = false; 1161 bool in_quote = false; 1162 char quote_c = 0; 1163 bool result = true; 1164 1165 int c = getc(stream); 1166 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1167 if (in_white_space) { 1168 if (in_comment) { 1169 if (c == '\n') in_comment = false; 1170 } else { 1171 if (c == '#') in_comment = true; 1172 else if (!isspace(c)) { 1173 in_white_space = false; 1174 token[pos++] = c; 1175 } 1176 } 1177 } else { 1178 if (c == '\n' || (!in_quote && isspace(c))) { 1179 // token ends at newline, or at unquoted whitespace 1180 // this allows a way to include spaces in string-valued options 1181 token[pos] = '\0'; 1182 logOption(token); 1183 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1184 build_jvm_flags(token); 1185 pos = 0; 1186 in_white_space = true; 1187 in_quote = false; 1188 } else if (!in_quote && (c == '\'' || c == '"')) { 1189 in_quote = true; 1190 quote_c = c; 1191 } else if (in_quote && (c == quote_c)) { 1192 in_quote = false; 1193 } else { 1194 token[pos++] = c; 1195 } 1196 } 1197 c = getc(stream); 1198 } 1199 if (pos > 0) { 1200 token[pos] = '\0'; 1201 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1202 build_jvm_flags(token); 1203 } 1204 fclose(stream); 1205 return result; 1206 } 1207 1208 //============================================================================================================= 1209 // Parsing of properties (-D) 1210 1211 const char* Arguments::get_property(const char* key) { 1212 return PropertyList_get_value(system_properties(), key); 1213 } 1214 1215 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1216 const char* eq = strchr(prop, '='); 1217 const char* key; 1218 const char* value = ""; 1219 1220 if (eq == NULL) { 1221 // property doesn't have a value, thus use passed string 1222 key = prop; 1223 } else { 1224 // property have a value, thus extract it and save to the 1225 // allocated string 1226 size_t key_len = eq - prop; 1227 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1228 1229 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1230 key = tmp_key; 1231 1232 value = &prop[key_len + 1]; 1233 } 1234 1235 if (strcmp(key, "java.compiler") == 0) { 1236 process_java_compiler_argument(value); 1237 // Record value in Arguments, but let it get passed to Java. 1238 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1239 strcmp(key, "sun.java.launcher.pid") == 0) { 1240 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1241 // private and are processed in process_sun_java_launcher_properties(); 1242 // the sun.java.launcher property is passed on to the java application 1243 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1244 // append is true, writable is true, internal is false 1245 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1246 WriteableProperty, ExternalProperty); 1247 } else { 1248 if (strcmp(key, "sun.java.command") == 0) { 1249 char *old_java_command = _java_command; 1250 _java_command = os::strdup_check_oom(value, mtArguments); 1251 if (old_java_command != NULL) { 1252 os::free(old_java_command); 1253 } 1254 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1255 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1256 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1257 // its value without going through the property list or making a Java call. 1258 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1259 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1260 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1261 os::free((void *)old_java_vendor_url_bug); 1262 } 1263 } 1264 1265 // Create new property and add at the end of the list 1266 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1267 } 1268 1269 if (key != prop) { 1270 // SystemProperty copy passed value, thus free previously allocated 1271 // memory 1272 FreeHeap((void *)key); 1273 } 1274 1275 return true; 1276 } 1277 1278 #if INCLUDE_CDS 1279 void Arguments::check_unsupported_dumping_properties() { 1280 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1281 const char* unsupported_properties[] = { "jdk.module.main", 1282 "jdk.module.limitmods", 1283 "jdk.module.path", 1284 "jdk.module.upgrade.path", 1285 "jdk.module.addmods.0", 1286 "jdk.module.patch.0" }; 1287 const char* unsupported_options[] = { "-m", // cannot use at dump time 1288 "--limit-modules", // ignored at dump time 1289 "--module-path", // ignored at dump time 1290 "--upgrade-module-path", // ignored at dump time 1291 "--add-modules", // ignored at dump time 1292 "--patch-module" // ignored at dump time 1293 }; 1294 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1295 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1296 // vm will exit with an error message. Otherwise, it will print an informational message if 1297 // PrintSharedSpaces is enabled. 1298 uint info_idx = 1; 1299 SystemProperty* sp = system_properties(); 1300 while (sp != NULL) { 1301 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1302 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1303 if (i < info_idx) { 1304 vm_exit_during_initialization( 1305 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1306 } else { 1307 if (PrintSharedSpaces) { 1308 tty->print_cr( 1309 "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]); 1310 } 1311 } 1312 } 1313 } 1314 sp = sp->next(); 1315 } 1316 1317 // Check for an exploded module build in use with -Xshare:dump. 1318 if (!has_jimage()) { 1319 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1320 } 1321 } 1322 #endif 1323 1324 //=========================================================================================================== 1325 // Setting int/mixed/comp mode flags 1326 1327 void Arguments::set_mode_flags(Mode mode) { 1328 // Set up default values for all flags. 1329 // If you add a flag to any of the branches below, 1330 // add a default value for it here. 1331 set_java_compiler(false); 1332 _mode = mode; 1333 1334 // Ensure Agent_OnLoad has the correct initial values. 1335 // This may not be the final mode; mode may change later in onload phase. 1336 PropertyList_unique_add(&_system_properties, "java.vm.info", 1337 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1338 1339 UseInterpreter = true; 1340 UseCompiler = true; 1341 UseLoopCounter = true; 1342 1343 // Default values may be platform/compiler dependent - 1344 // use the saved values 1345 ClipInlining = Arguments::_ClipInlining; 1346 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1347 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1348 BackgroundCompilation = Arguments::_BackgroundCompilation; 1349 if (TieredCompilation) { 1350 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1351 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1352 } 1353 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1354 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1355 } 1356 } 1357 1358 // Change from defaults based on mode 1359 switch (mode) { 1360 default: 1361 ShouldNotReachHere(); 1362 break; 1363 case _int: 1364 UseCompiler = false; 1365 UseLoopCounter = false; 1366 AlwaysCompileLoopMethods = false; 1367 UseOnStackReplacement = false; 1368 break; 1369 case _mixed: 1370 // same as default 1371 break; 1372 case _comp: 1373 UseInterpreter = false; 1374 BackgroundCompilation = false; 1375 ClipInlining = false; 1376 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1377 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1378 // compile a level 4 (C2) and then continue executing it. 1379 if (TieredCompilation) { 1380 Tier3InvokeNotifyFreqLog = 0; 1381 Tier4InvocationThreshold = 0; 1382 } 1383 break; 1384 } 1385 } 1386 1387 // Conflict: required to use shared spaces (-Xshare:on), but 1388 // incompatible command line options were chosen. 1389 static void no_shared_spaces(const char* message) { 1390 if (RequireSharedSpaces) { 1391 jio_fprintf(defaultStream::error_stream(), 1392 "Class data sharing is inconsistent with other specified options.\n"); 1393 vm_exit_during_initialization("Unable to use shared archive.", message); 1394 } else { 1395 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1396 } 1397 } 1398 1399 // Returns threshold scaled with the value of scale. 1400 // If scale < 0.0, threshold is returned without scaling. 1401 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1402 if (scale == 1.0 || scale < 0.0) { 1403 return threshold; 1404 } else { 1405 return (intx)(threshold * scale); 1406 } 1407 } 1408 1409 // Returns freq_log scaled with the value of scale. 1410 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1411 // If scale < 0.0, freq_log is returned without scaling. 1412 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1413 // Check if scaling is necessary or if negative value was specified. 1414 if (scale == 1.0 || scale < 0.0) { 1415 return freq_log; 1416 } 1417 // Check values to avoid calculating log2 of 0. 1418 if (scale == 0.0 || freq_log == 0) { 1419 return 0; 1420 } 1421 // Determine the maximum notification frequency value currently supported. 1422 // The largest mask value that the interpreter/C1 can handle is 1423 // of length InvocationCounter::number_of_count_bits. Mask values are always 1424 // one bit shorter then the value of the notification frequency. Set 1425 // max_freq_bits accordingly. 1426 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1427 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1428 if (scaled_freq == 0) { 1429 // Return 0 right away to avoid calculating log2 of 0. 1430 return 0; 1431 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1432 return max_freq_bits; 1433 } else { 1434 return log2_intptr(scaled_freq); 1435 } 1436 } 1437 1438 void Arguments::set_tiered_flags() { 1439 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1440 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1441 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1442 } 1443 if (CompilationPolicyChoice < 2) { 1444 vm_exit_during_initialization( 1445 "Incompatible compilation policy selected", NULL); 1446 } 1447 // Increase the code cache size - tiered compiles a lot more. 1448 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1449 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1450 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1451 } 1452 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1453 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1454 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1455 } 1456 if (!UseInterpreter) { // -Xcomp 1457 Tier3InvokeNotifyFreqLog = 0; 1458 Tier4InvocationThreshold = 0; 1459 } 1460 1461 if (CompileThresholdScaling < 0) { 1462 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1463 } 1464 1465 // Scale tiered compilation thresholds. 1466 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1467 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1468 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1469 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1470 1471 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1472 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1473 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1474 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1475 1476 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1477 // once these thresholds become supported. 1478 1479 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1480 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1481 1482 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1483 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1484 1485 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1486 1487 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1488 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1489 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1490 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1491 } 1492 } 1493 1494 #if INCLUDE_ALL_GCS 1495 static void disable_adaptive_size_policy(const char* collector_name) { 1496 if (UseAdaptiveSizePolicy) { 1497 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1498 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1499 collector_name); 1500 } 1501 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1502 } 1503 } 1504 1505 void Arguments::set_parnew_gc_flags() { 1506 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1507 "control point invariant"); 1508 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1509 1510 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1511 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1512 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1513 } else if (ParallelGCThreads == 0) { 1514 jio_fprintf(defaultStream::error_stream(), 1515 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1516 vm_exit(1); 1517 } 1518 1519 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1520 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1521 // we set them to 1024 and 1024. 1522 // See CR 6362902. 1523 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1524 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1525 } 1526 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1527 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1528 } 1529 1530 // When using compressed oops, we use local overflow stacks, 1531 // rather than using a global overflow list chained through 1532 // the klass word of the object's pre-image. 1533 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1534 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1535 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1536 } 1537 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1538 } 1539 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1540 } 1541 1542 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1543 // sparc/solaris for certain applications, but would gain from 1544 // further optimization and tuning efforts, and would almost 1545 // certainly gain from analysis of platform and environment. 1546 void Arguments::set_cms_and_parnew_gc_flags() { 1547 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1548 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1549 1550 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1551 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1552 1553 set_parnew_gc_flags(); 1554 1555 size_t max_heap = align_size_down(MaxHeapSize, 1556 CardTableRS::ct_max_alignment_constraint()); 1557 1558 // Now make adjustments for CMS 1559 intx tenuring_default = (intx)6; 1560 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1561 1562 // Preferred young gen size for "short" pauses: 1563 // upper bound depends on # of threads and NewRatio. 1564 const size_t preferred_max_new_size_unaligned = 1565 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1566 size_t preferred_max_new_size = 1567 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1568 1569 // Unless explicitly requested otherwise, size young gen 1570 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1571 1572 // If either MaxNewSize or NewRatio is set on the command line, 1573 // assume the user is trying to set the size of the young gen. 1574 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1575 1576 // Set MaxNewSize to our calculated preferred_max_new_size unless 1577 // NewSize was set on the command line and it is larger than 1578 // preferred_max_new_size. 1579 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1580 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1581 } else { 1582 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1583 } 1584 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1585 1586 // Code along this path potentially sets NewSize and OldSize 1587 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1588 min_heap_size(), InitialHeapSize, max_heap); 1589 size_t min_new = preferred_max_new_size; 1590 if (FLAG_IS_CMDLINE(NewSize)) { 1591 min_new = NewSize; 1592 } 1593 if (max_heap > min_new && min_heap_size() > min_new) { 1594 // Unless explicitly requested otherwise, make young gen 1595 // at least min_new, and at most preferred_max_new_size. 1596 if (FLAG_IS_DEFAULT(NewSize)) { 1597 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1598 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1599 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1600 } 1601 // Unless explicitly requested otherwise, size old gen 1602 // so it's NewRatio x of NewSize. 1603 if (FLAG_IS_DEFAULT(OldSize)) { 1604 if (max_heap > NewSize) { 1605 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1606 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1607 } 1608 } 1609 } 1610 } 1611 // Unless explicitly requested otherwise, definitely 1612 // promote all objects surviving "tenuring_default" scavenges. 1613 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1614 FLAG_IS_DEFAULT(SurvivorRatio)) { 1615 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1616 } 1617 // If we decided above (or user explicitly requested) 1618 // `promote all' (via MaxTenuringThreshold := 0), 1619 // prefer minuscule survivor spaces so as not to waste 1620 // space for (non-existent) survivors 1621 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1622 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1623 } 1624 1625 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1626 // but rather the number of free blocks of a given size that are used when 1627 // replenishing the local per-worker free list caches. 1628 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1629 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1630 // OldPLAB sizing manually turned off: Use a larger default setting, 1631 // unless it was manually specified. This is because a too-low value 1632 // will slow down scavenges. 1633 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1634 } else { 1635 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1636 } 1637 } 1638 1639 // If either of the static initialization defaults have changed, note this 1640 // modification. 1641 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1642 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1643 } 1644 1645 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1646 } 1647 #endif // INCLUDE_ALL_GCS 1648 1649 void set_object_alignment() { 1650 // Object alignment. 1651 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1652 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1653 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1654 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1655 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1656 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1657 1658 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1659 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1660 1661 // Oop encoding heap max 1662 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1663 1664 if (SurvivorAlignmentInBytes == 0) { 1665 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1666 } 1667 1668 #if INCLUDE_ALL_GCS 1669 // Set CMS global values 1670 CompactibleFreeListSpace::set_cms_values(); 1671 #endif // INCLUDE_ALL_GCS 1672 } 1673 1674 size_t Arguments::max_heap_for_compressed_oops() { 1675 // Avoid sign flip. 1676 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1677 // We need to fit both the NULL page and the heap into the memory budget, while 1678 // keeping alignment constraints of the heap. To guarantee the latter, as the 1679 // NULL page is located before the heap, we pad the NULL page to the conservative 1680 // maximum alignment that the GC may ever impose upon the heap. 1681 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1682 _conservative_max_heap_alignment); 1683 1684 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1685 NOT_LP64(ShouldNotReachHere(); return 0); 1686 } 1687 1688 void Arguments::set_use_compressed_oops() { 1689 #ifndef ZERO 1690 #ifdef _LP64 1691 // MaxHeapSize is not set up properly at this point, but 1692 // the only value that can override MaxHeapSize if we are 1693 // to use UseCompressedOops is InitialHeapSize. 1694 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1695 1696 if (max_heap_size <= max_heap_for_compressed_oops()) { 1697 #if !defined(COMPILER1) || defined(TIERED) 1698 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1699 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1700 } 1701 #endif 1702 } else { 1703 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1704 warning("Max heap size too large for Compressed Oops"); 1705 FLAG_SET_DEFAULT(UseCompressedOops, false); 1706 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1707 } 1708 } 1709 #endif // _LP64 1710 #endif // ZERO 1711 } 1712 1713 1714 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1715 // set_use_compressed_oops(). 1716 void Arguments::set_use_compressed_klass_ptrs() { 1717 #ifndef ZERO 1718 #ifdef _LP64 1719 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1720 if (!UseCompressedOops) { 1721 if (UseCompressedClassPointers) { 1722 warning("UseCompressedClassPointers requires UseCompressedOops"); 1723 } 1724 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1725 } else { 1726 // Turn on UseCompressedClassPointers too 1727 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1728 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1729 } 1730 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1731 if (UseCompressedClassPointers) { 1732 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1733 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1734 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1735 } 1736 } 1737 } 1738 #endif // _LP64 1739 #endif // !ZERO 1740 } 1741 1742 void Arguments::set_conservative_max_heap_alignment() { 1743 // The conservative maximum required alignment for the heap is the maximum of 1744 // the alignments imposed by several sources: any requirements from the heap 1745 // itself, the collector policy and the maximum page size we may run the VM 1746 // with. 1747 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1748 #if INCLUDE_ALL_GCS 1749 if (UseParallelGC) { 1750 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1751 } else if (UseG1GC) { 1752 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1753 } 1754 #endif // INCLUDE_ALL_GCS 1755 _conservative_max_heap_alignment = MAX4(heap_alignment, 1756 (size_t)os::vm_allocation_granularity(), 1757 os::max_page_size(), 1758 CollectorPolicy::compute_heap_alignment()); 1759 } 1760 1761 bool Arguments::gc_selected() { 1762 #if INCLUDE_ALL_GCS 1763 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC || UseEpsilonGC; 1764 #else 1765 return UseSerialGC; 1766 #endif // INCLUDE_ALL_GCS 1767 } 1768 1769 void Arguments::select_gc_ergonomically() { 1770 #if INCLUDE_ALL_GCS 1771 if (os::is_server_class_machine()) { 1772 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1773 } else { 1774 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1775 } 1776 #else 1777 UNSUPPORTED_OPTION(UseG1GC); 1778 UNSUPPORTED_OPTION(UseParallelGC); 1779 UNSUPPORTED_OPTION(UseParallelOldGC); 1780 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1781 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1782 #endif // INCLUDE_ALL_GCS 1783 } 1784 1785 void Arguments::select_gc() { 1786 if (!gc_selected()) { 1787 select_gc_ergonomically(); 1788 if (!gc_selected()) { 1789 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1790 } 1791 } 1792 } 1793 1794 void Arguments::set_ergonomics_flags() { 1795 select_gc(); 1796 1797 #if defined(COMPILER2) || INCLUDE_JVMCI 1798 // Shared spaces work fine with other GCs but causes bytecode rewriting 1799 // to be disabled, which hurts interpreter performance and decreases 1800 // server performance. When -server is specified, keep the default off 1801 // unless it is asked for. Future work: either add bytecode rewriting 1802 // at link time, or rewrite bytecodes in non-shared methods. 1803 if (!DumpSharedSpaces && !RequireSharedSpaces && 1804 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1805 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1806 } 1807 #endif 1808 1809 set_conservative_max_heap_alignment(); 1810 1811 #ifndef ZERO 1812 #ifdef _LP64 1813 set_use_compressed_oops(); 1814 1815 // set_use_compressed_klass_ptrs() must be called after calling 1816 // set_use_compressed_oops(). 1817 set_use_compressed_klass_ptrs(); 1818 1819 // Also checks that certain machines are slower with compressed oops 1820 // in vm_version initialization code. 1821 #endif // _LP64 1822 #endif // !ZERO 1823 1824 } 1825 1826 void Arguments::set_parallel_gc_flags() { 1827 assert(UseParallelGC || UseParallelOldGC, "Error"); 1828 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1829 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1830 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1831 } 1832 FLAG_SET_DEFAULT(UseParallelGC, true); 1833 1834 // If no heap maximum was requested explicitly, use some reasonable fraction 1835 // of the physical memory, up to a maximum of 1GB. 1836 FLAG_SET_DEFAULT(ParallelGCThreads, 1837 Abstract_VM_Version::parallel_worker_threads()); 1838 if (ParallelGCThreads == 0) { 1839 jio_fprintf(defaultStream::error_stream(), 1840 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1841 vm_exit(1); 1842 } 1843 1844 if (UseAdaptiveSizePolicy) { 1845 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1846 // unless the user actually sets these flags. 1847 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1848 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1849 } 1850 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1851 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1852 } 1853 } 1854 1855 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1856 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1857 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1858 // See CR 6362902 for details. 1859 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1860 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1861 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1862 } 1863 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1864 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1865 } 1866 } 1867 1868 if (UseParallelOldGC) { 1869 // Par compact uses lower default values since they are treated as 1870 // minimums. These are different defaults because of the different 1871 // interpretation and are not ergonomically set. 1872 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1873 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1874 } 1875 } 1876 } 1877 1878 void Arguments::set_g1_gc_flags() { 1879 assert(UseG1GC, "Error"); 1880 #if defined(COMPILER1) || INCLUDE_JVMCI 1881 FastTLABRefill = false; 1882 #endif 1883 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1884 if (ParallelGCThreads == 0) { 1885 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1886 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1887 } 1888 1889 #if INCLUDE_ALL_GCS 1890 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1891 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1892 } 1893 #endif 1894 1895 // MarkStackSize will be set (if it hasn't been set by the user) 1896 // when concurrent marking is initialized. 1897 // Its value will be based upon the number of parallel marking threads. 1898 // But we do set the maximum mark stack size here. 1899 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1900 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1901 } 1902 1903 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1904 // In G1, we want the default GC overhead goal to be higher than 1905 // it is for PS, or the heap might be expanded too aggressively. 1906 // We set it here to ~8%. 1907 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1908 } 1909 1910 // Below, we might need to calculate the pause time interval based on 1911 // the pause target. When we do so we are going to give G1 maximum 1912 // flexibility and allow it to do pauses when it needs to. So, we'll 1913 // arrange that the pause interval to be pause time target + 1 to 1914 // ensure that a) the pause time target is maximized with respect to 1915 // the pause interval and b) we maintain the invariant that pause 1916 // time target < pause interval. If the user does not want this 1917 // maximum flexibility, they will have to set the pause interval 1918 // explicitly. 1919 1920 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1921 // The default pause time target in G1 is 200ms 1922 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1923 } 1924 1925 // Then, if the interval parameter was not set, set it according to 1926 // the pause time target (this will also deal with the case when the 1927 // pause time target is the default value). 1928 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1929 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1930 } 1931 1932 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1933 } 1934 1935 void Arguments::set_epsilon_flags() { 1936 assert(UseEpsilonGC, "Error"); 1937 1938 // Forcefully exit when OOME is detected. Nothing we can do at that point. 1939 if (FLAG_IS_DEFAULT(ExitOnOutOfMemoryError)) { 1940 FLAG_SET_DEFAULT(ExitOnOutOfMemoryError, true); 1941 } 1942 } 1943 1944 void Arguments::set_gc_specific_flags() { 1945 #if INCLUDE_ALL_GCS 1946 // Set per-collector flags 1947 if (UseParallelGC || UseParallelOldGC) { 1948 set_parallel_gc_flags(); 1949 } else if (UseConcMarkSweepGC) { 1950 set_cms_and_parnew_gc_flags(); 1951 } else if (UseG1GC) { 1952 set_g1_gc_flags(); 1953 } else if (UseEpsilonGC) { 1954 set_epsilon_flags(); 1955 } 1956 if (AssumeMP && !UseSerialGC) { 1957 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1958 warning("If the number of processors is expected to increase from one, then" 1959 " you should configure the number of parallel GC threads appropriately" 1960 " using -XX:ParallelGCThreads=N"); 1961 } 1962 } 1963 if (MinHeapFreeRatio == 100) { 1964 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1965 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1966 } 1967 1968 // If class unloading is disabled, also disable concurrent class unloading. 1969 if (!ClassUnloading) { 1970 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1971 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 1972 } 1973 #endif // INCLUDE_ALL_GCS 1974 } 1975 1976 julong Arguments::limit_by_allocatable_memory(julong limit) { 1977 julong max_allocatable; 1978 julong result = limit; 1979 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1980 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1981 } 1982 return result; 1983 } 1984 1985 // Use static initialization to get the default before parsing 1986 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1987 1988 void Arguments::set_heap_size() { 1989 julong phys_mem = 1990 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1991 : (julong)MaxRAM; 1992 1993 // Experimental support for CGroup memory limits 1994 if (UseCGroupMemoryLimitForHeap) { 1995 // This is a rough indicator that a CGroup limit may be in force 1996 // for this process 1997 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 1998 FILE *fp = fopen(lim_file, "r"); 1999 if (fp != NULL) { 2000 julong cgroup_max = 0; 2001 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2002 if (ret == 1 && cgroup_max > 0) { 2003 // If unlimited, cgroup_max will be a very large, but unspecified 2004 // value, so use initial phys_mem as a limit 2005 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2006 JULONG_FORMAT "MB) and initial phys_mem (" 2007 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2008 phys_mem = MIN2(cgroup_max, phys_mem); 2009 } else { 2010 warning("Unable to read/parse cgroup memory limit from %s: %s", 2011 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2012 } 2013 fclose(fp); 2014 } else { 2015 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2016 } 2017 } 2018 2019 // If the maximum heap size has not been set with -Xmx, 2020 // then set it as fraction of the size of physical memory, 2021 // respecting the maximum and minimum sizes of the heap. 2022 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2023 julong reasonable_max = phys_mem / MaxRAMFraction; 2024 2025 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2026 // Small physical memory, so use a minimum fraction of it for the heap 2027 reasonable_max = phys_mem / MinRAMFraction; 2028 } else { 2029 // Not-small physical memory, so require a heap at least 2030 // as large as MaxHeapSize 2031 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2032 } 2033 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2034 // Limit the heap size to ErgoHeapSizeLimit 2035 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2036 } 2037 if (UseCompressedOops) { 2038 // Limit the heap size to the maximum possible when using compressed oops 2039 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2040 2041 // HeapBaseMinAddress can be greater than default but not less than. 2042 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2043 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2044 // matches compressed oops printing flags 2045 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2046 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2047 DefaultHeapBaseMinAddress, 2048 DefaultHeapBaseMinAddress/G, 2049 HeapBaseMinAddress); 2050 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2051 } 2052 } 2053 2054 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2055 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2056 // but it should be not less than default MaxHeapSize. 2057 max_coop_heap -= HeapBaseMinAddress; 2058 } 2059 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2060 } 2061 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2062 2063 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2064 // An initial heap size was specified on the command line, 2065 // so be sure that the maximum size is consistent. Done 2066 // after call to limit_by_allocatable_memory because that 2067 // method might reduce the allocation size. 2068 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2069 } 2070 2071 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2072 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2073 } 2074 2075 // If the minimum or initial heap_size have not been set or requested to be set 2076 // ergonomically, set them accordingly. 2077 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2078 julong reasonable_minimum = (julong)(OldSize + NewSize); 2079 2080 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2081 2082 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2083 2084 if (InitialHeapSize == 0) { 2085 julong reasonable_initial = phys_mem / InitialRAMFraction; 2086 2087 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2088 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2089 2090 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2091 2092 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2093 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2094 } 2095 // If the minimum heap size has not been set (via -Xms), 2096 // synchronize with InitialHeapSize to avoid errors with the default value. 2097 if (min_heap_size() == 0) { 2098 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2099 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2100 } 2101 } 2102 } 2103 2104 // This option inspects the machine and attempts to set various 2105 // parameters to be optimal for long-running, memory allocation 2106 // intensive jobs. It is intended for machines with large 2107 // amounts of cpu and memory. 2108 jint Arguments::set_aggressive_heap_flags() { 2109 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2110 // VM, but we may not be able to represent the total physical memory 2111 // available (like having 8gb of memory on a box but using a 32bit VM). 2112 // Thus, we need to make sure we're using a julong for intermediate 2113 // calculations. 2114 julong initHeapSize; 2115 julong total_memory = os::physical_memory(); 2116 2117 if (total_memory < (julong) 256 * M) { 2118 jio_fprintf(defaultStream::error_stream(), 2119 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2120 vm_exit(1); 2121 } 2122 2123 // The heap size is half of available memory, or (at most) 2124 // all of possible memory less 160mb (leaving room for the OS 2125 // when using ISM). This is the maximum; because adaptive sizing 2126 // is turned on below, the actual space used may be smaller. 2127 2128 initHeapSize = MIN2(total_memory / (julong) 2, 2129 total_memory - (julong) 160 * M); 2130 2131 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2132 2133 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2134 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2135 return JNI_EINVAL; 2136 } 2137 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2138 return JNI_EINVAL; 2139 } 2140 // Currently the minimum size and the initial heap sizes are the same. 2141 set_min_heap_size(initHeapSize); 2142 } 2143 if (FLAG_IS_DEFAULT(NewSize)) { 2144 // Make the young generation 3/8ths of the total heap. 2145 if (FLAG_SET_CMDLINE(size_t, NewSize, 2146 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2147 return JNI_EINVAL; 2148 } 2149 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2150 return JNI_EINVAL; 2151 } 2152 } 2153 2154 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2155 FLAG_SET_DEFAULT(UseLargePages, true); 2156 #endif 2157 2158 // Increase some data structure sizes for efficiency 2159 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2160 return JNI_EINVAL; 2161 } 2162 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2163 return JNI_EINVAL; 2164 } 2165 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2166 return JNI_EINVAL; 2167 } 2168 2169 // See the OldPLABSize comment below, but replace 'after promotion' 2170 // with 'after copying'. YoungPLABSize is the size of the survivor 2171 // space per-gc-thread buffers. The default is 4kw. 2172 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2173 return JNI_EINVAL; 2174 } 2175 2176 // OldPLABSize is the size of the buffers in the old gen that 2177 // UseParallelGC uses to promote live data that doesn't fit in the 2178 // survivor spaces. At any given time, there's one for each gc thread. 2179 // The default size is 1kw. These buffers are rarely used, since the 2180 // survivor spaces are usually big enough. For specjbb, however, there 2181 // are occasions when there's lots of live data in the young gen 2182 // and we end up promoting some of it. We don't have a definite 2183 // explanation for why bumping OldPLABSize helps, but the theory 2184 // is that a bigger PLAB results in retaining something like the 2185 // original allocation order after promotion, which improves mutator 2186 // locality. A minor effect may be that larger PLABs reduce the 2187 // number of PLAB allocation events during gc. The value of 8kw 2188 // was arrived at by experimenting with specjbb. 2189 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2190 return JNI_EINVAL; 2191 } 2192 2193 // Enable parallel GC and adaptive generation sizing 2194 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2195 return JNI_EINVAL; 2196 } 2197 FLAG_SET_DEFAULT(ParallelGCThreads, 2198 Abstract_VM_Version::parallel_worker_threads()); 2199 2200 // Encourage steady state memory management 2201 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2202 return JNI_EINVAL; 2203 } 2204 2205 // This appears to improve mutator locality 2206 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2207 return JNI_EINVAL; 2208 } 2209 2210 // Get around early Solaris scheduling bug 2211 // (affinity vs other jobs on system) 2212 // but disallow DR and offlining (5008695). 2213 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2214 return JNI_EINVAL; 2215 } 2216 2217 return JNI_OK; 2218 } 2219 2220 // This must be called after ergonomics. 2221 void Arguments::set_bytecode_flags() { 2222 if (!RewriteBytecodes) { 2223 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2224 } 2225 } 2226 2227 // Aggressive optimization flags -XX:+AggressiveOpts 2228 jint Arguments::set_aggressive_opts_flags() { 2229 #ifdef COMPILER2 2230 if (AggressiveUnboxing) { 2231 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2232 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2233 } else if (!EliminateAutoBox) { 2234 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2235 AggressiveUnboxing = false; 2236 } 2237 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2238 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2239 } else if (!DoEscapeAnalysis) { 2240 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2241 AggressiveUnboxing = false; 2242 } 2243 } 2244 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2245 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2246 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2247 } 2248 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2249 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2250 } 2251 2252 // Feed the cache size setting into the JDK 2253 char buffer[1024]; 2254 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2255 if (!add_property(buffer)) { 2256 return JNI_ENOMEM; 2257 } 2258 } 2259 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2260 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2261 } 2262 #endif 2263 2264 if (AggressiveOpts) { 2265 // Sample flag setting code 2266 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2267 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2268 // } 2269 } 2270 2271 return JNI_OK; 2272 } 2273 2274 //=========================================================================================================== 2275 // Parsing of java.compiler property 2276 2277 void Arguments::process_java_compiler_argument(const char* arg) { 2278 // For backwards compatibility, Djava.compiler=NONE or "" 2279 // causes us to switch to -Xint mode UNLESS -Xdebug 2280 // is also specified. 2281 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2282 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2283 } 2284 } 2285 2286 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2287 _sun_java_launcher = os::strdup_check_oom(launcher); 2288 } 2289 2290 bool Arguments::created_by_java_launcher() { 2291 assert(_sun_java_launcher != NULL, "property must have value"); 2292 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2293 } 2294 2295 bool Arguments::sun_java_launcher_is_altjvm() { 2296 return _sun_java_launcher_is_altjvm; 2297 } 2298 2299 //=========================================================================================================== 2300 // Parsing of main arguments 2301 2302 #if INCLUDE_JVMCI 2303 // Check consistency of jvmci vm argument settings. 2304 bool Arguments::check_jvmci_args_consistency() { 2305 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2306 } 2307 #endif //INCLUDE_JVMCI 2308 2309 // Check consistency of GC selection 2310 bool Arguments::check_gc_consistency() { 2311 // Ensure that the user has not selected conflicting sets 2312 // of collectors. 2313 uint i = 0; 2314 if (UseSerialGC) i++; 2315 if (UseConcMarkSweepGC) i++; 2316 if (UseParallelGC || UseParallelOldGC) i++; 2317 if (UseG1GC) i++; 2318 if (UseEpsilonGC) i++; 2319 if (i > 1) { 2320 jio_fprintf(defaultStream::error_stream(), 2321 "Conflicting collector combinations in option list; " 2322 "please refer to the release notes for the combinations " 2323 "allowed\n"); 2324 return false; 2325 } 2326 2327 return true; 2328 } 2329 2330 // Check the consistency of vm_init_args 2331 bool Arguments::check_vm_args_consistency() { 2332 // Method for adding checks for flag consistency. 2333 // The intent is to warn the user of all possible conflicts, 2334 // before returning an error. 2335 // Note: Needs platform-dependent factoring. 2336 bool status = true; 2337 2338 if (TLABRefillWasteFraction == 0) { 2339 jio_fprintf(defaultStream::error_stream(), 2340 "TLABRefillWasteFraction should be a denominator, " 2341 "not " SIZE_FORMAT "\n", 2342 TLABRefillWasteFraction); 2343 status = false; 2344 } 2345 2346 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2347 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2348 } 2349 2350 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2351 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2352 } 2353 2354 if (GCTimeLimit == 100) { 2355 // Turn off gc-overhead-limit-exceeded checks 2356 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2357 } 2358 2359 status = status && check_gc_consistency(); 2360 2361 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2362 // insists that we hold the requisite locks so that the iteration is 2363 // MT-safe. For the verification at start-up and shut-down, we don't 2364 // yet have a good way of acquiring and releasing these locks, 2365 // which are not visible at the CollectedHeap level. We want to 2366 // be able to acquire these locks and then do the iteration rather 2367 // than just disable the lock verification. This will be fixed under 2368 // bug 4788986. 2369 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2370 if (VerifyDuringStartup) { 2371 warning("Heap verification at start-up disabled " 2372 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2373 VerifyDuringStartup = false; // Disable verification at start-up 2374 } 2375 2376 if (VerifyBeforeExit) { 2377 warning("Heap verification at shutdown disabled " 2378 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2379 VerifyBeforeExit = false; // Disable verification at shutdown 2380 } 2381 } 2382 2383 if (PrintNMTStatistics) { 2384 #if INCLUDE_NMT 2385 if (MemTracker::tracking_level() == NMT_off) { 2386 #endif // INCLUDE_NMT 2387 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2388 PrintNMTStatistics = false; 2389 #if INCLUDE_NMT 2390 } 2391 #endif 2392 } 2393 #if INCLUDE_JVMCI 2394 2395 status = status && check_jvmci_args_consistency(); 2396 2397 if (EnableJVMCI) { 2398 if (!ScavengeRootsInCode) { 2399 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2400 ScavengeRootsInCode = 1; 2401 } 2402 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2403 TypeProfileLevel = 0; 2404 } 2405 if (UseJVMCICompiler) { 2406 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2407 TypeProfileWidth = 8; 2408 } 2409 } 2410 } 2411 #endif 2412 2413 // Check lower bounds of the code cache 2414 // Template Interpreter code is approximately 3X larger in debug builds. 2415 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2416 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2417 jio_fprintf(defaultStream::error_stream(), 2418 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2419 os::vm_page_size()/K); 2420 status = false; 2421 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2422 jio_fprintf(defaultStream::error_stream(), 2423 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2424 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2425 status = false; 2426 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2427 jio_fprintf(defaultStream::error_stream(), 2428 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2429 min_code_cache_size/K); 2430 status = false; 2431 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2432 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2433 jio_fprintf(defaultStream::error_stream(), 2434 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2435 CODE_CACHE_SIZE_LIMIT/M); 2436 status = false; 2437 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2438 jio_fprintf(defaultStream::error_stream(), 2439 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2440 min_code_cache_size/K); 2441 status = false; 2442 } 2443 2444 #ifdef _LP64 2445 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2446 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2447 } 2448 #endif 2449 2450 #ifndef SUPPORT_RESERVED_STACK_AREA 2451 if (StackReservedPages != 0) { 2452 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2453 warning("Reserved Stack Area not supported on this platform"); 2454 } 2455 #endif 2456 2457 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2458 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2459 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2460 } 2461 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2462 } 2463 if (UseCompiler && is_interpreter_only()) { 2464 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2465 warning("UseCompiler disabled due to -Xint."); 2466 } 2467 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2468 } 2469 #ifdef COMPILER2 2470 if (PostLoopMultiversioning && !RangeCheckElimination) { 2471 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2472 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2473 } 2474 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2475 } 2476 #endif 2477 return status; 2478 } 2479 2480 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2481 const char* option_type) { 2482 if (ignore) return false; 2483 2484 const char* spacer = " "; 2485 if (option_type == NULL) { 2486 option_type = ++spacer; // Set both to the empty string. 2487 } 2488 2489 if (os::obsolete_option(option)) { 2490 jio_fprintf(defaultStream::error_stream(), 2491 "Obsolete %s%soption: %s\n", option_type, spacer, 2492 option->optionString); 2493 return false; 2494 } else { 2495 jio_fprintf(defaultStream::error_stream(), 2496 "Unrecognized %s%soption: %s\n", option_type, spacer, 2497 option->optionString); 2498 return true; 2499 } 2500 } 2501 2502 static const char* user_assertion_options[] = { 2503 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2504 }; 2505 2506 static const char* system_assertion_options[] = { 2507 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2508 }; 2509 2510 bool Arguments::parse_uintx(const char* value, 2511 uintx* uintx_arg, 2512 uintx min_size) { 2513 2514 // Check the sign first since atojulong() parses only unsigned values. 2515 bool value_is_positive = !(*value == '-'); 2516 2517 if (value_is_positive) { 2518 julong n; 2519 bool good_return = atojulong(value, &n); 2520 if (good_return) { 2521 bool above_minimum = n >= min_size; 2522 bool value_is_too_large = n > max_uintx; 2523 2524 if (above_minimum && !value_is_too_large) { 2525 *uintx_arg = n; 2526 return true; 2527 } 2528 } 2529 } 2530 return false; 2531 } 2532 2533 unsigned int addreads_count = 0; 2534 unsigned int addexports_count = 0; 2535 unsigned int addopens_count = 0; 2536 unsigned int addmods_count = 0; 2537 unsigned int patch_mod_count = 0; 2538 2539 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2540 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2541 char* property = AllocateHeap(prop_len, mtArguments); 2542 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2543 if (ret < 0 || ret >= (int)prop_len) { 2544 FreeHeap(property); 2545 return false; 2546 } 2547 bool added = add_property(property, UnwriteableProperty, internal); 2548 FreeHeap(property); 2549 return added; 2550 } 2551 2552 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2553 // Make sure count is < 1,000. Otherwise, memory allocation will be too small. 2554 if (count < 1000) { 2555 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5; 2556 char* property = AllocateHeap(prop_len, mtArguments); 2557 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2558 if (ret < 0 || ret >= (int)prop_len) { 2559 FreeHeap(property); 2560 return false; 2561 } 2562 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2563 FreeHeap(property); 2564 return added; 2565 } 2566 return false; 2567 } 2568 2569 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2570 julong* long_arg, 2571 julong min_size) { 2572 if (!atojulong(s, long_arg)) return arg_unreadable; 2573 return check_memory_size(*long_arg, min_size); 2574 } 2575 2576 // Parse JavaVMInitArgs structure 2577 2578 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2579 const JavaVMInitArgs *java_options_args, 2580 const JavaVMInitArgs *cmd_line_args) { 2581 bool patch_mod_javabase = false; 2582 2583 // Save default settings for some mode flags 2584 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2585 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2586 Arguments::_ClipInlining = ClipInlining; 2587 Arguments::_BackgroundCompilation = BackgroundCompilation; 2588 if (TieredCompilation) { 2589 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2590 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2591 } 2592 2593 // Setup flags for mixed which is the default 2594 set_mode_flags(_mixed); 2595 2596 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2597 // variable (if present). 2598 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2599 if (result != JNI_OK) { 2600 return result; 2601 } 2602 2603 // Parse args structure generated from the command line flags. 2604 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2605 if (result != JNI_OK) { 2606 return result; 2607 } 2608 2609 // Parse args structure generated from the _JAVA_OPTIONS environment 2610 // variable (if present) (mimics classic VM) 2611 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2612 if (result != JNI_OK) { 2613 return result; 2614 } 2615 2616 // Do final processing now that all arguments have been parsed 2617 result = finalize_vm_init_args(); 2618 if (result != JNI_OK) { 2619 return result; 2620 } 2621 2622 #if INCLUDE_CDS 2623 if (UseSharedSpaces && patch_mod_javabase) { 2624 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 2625 } 2626 #endif 2627 2628 return JNI_OK; 2629 } 2630 2631 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2632 // represents a valid JDWP agent. is_path==true denotes that we 2633 // are dealing with -agentpath (case where name is a path), otherwise with 2634 // -agentlib 2635 bool valid_jdwp_agent(char *name, bool is_path) { 2636 char *_name; 2637 const char *_jdwp = "jdwp"; 2638 size_t _len_jdwp, _len_prefix; 2639 2640 if (is_path) { 2641 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2642 return false; 2643 } 2644 2645 _name++; // skip past last path separator 2646 _len_prefix = strlen(JNI_LIB_PREFIX); 2647 2648 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2649 return false; 2650 } 2651 2652 _name += _len_prefix; 2653 _len_jdwp = strlen(_jdwp); 2654 2655 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2656 _name += _len_jdwp; 2657 } 2658 else { 2659 return false; 2660 } 2661 2662 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2663 return false; 2664 } 2665 2666 return true; 2667 } 2668 2669 if (strcmp(name, _jdwp) == 0) { 2670 return true; 2671 } 2672 2673 return false; 2674 } 2675 2676 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2677 // --patch-module=<module>=<file>(<pathsep><file>)* 2678 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2679 // Find the equal sign between the module name and the path specification 2680 const char* module_equal = strchr(patch_mod_tail, '='); 2681 if (module_equal == NULL) { 2682 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2683 return JNI_ERR; 2684 } else { 2685 // Pick out the module name 2686 size_t module_len = module_equal - patch_mod_tail; 2687 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2688 if (module_name != NULL) { 2689 memcpy(module_name, patch_mod_tail, module_len); 2690 *(module_name + module_len) = '\0'; 2691 // The path piece begins one past the module_equal sign 2692 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2693 FREE_C_HEAP_ARRAY(char, module_name); 2694 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2695 return JNI_ENOMEM; 2696 } 2697 } else { 2698 return JNI_ENOMEM; 2699 } 2700 } 2701 return JNI_OK; 2702 } 2703 2704 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2705 // For match_option to return remaining or value part of option string 2706 const char* tail; 2707 2708 // iterate over arguments 2709 for (int index = 0; index < args->nOptions; index++) { 2710 bool is_absolute_path = false; // for -agentpath vs -agentlib 2711 2712 const JavaVMOption* option = args->options + index; 2713 2714 if (!match_option(option, "-Djava.class.path", &tail) && 2715 !match_option(option, "-Dsun.java.command", &tail) && 2716 !match_option(option, "-Dsun.java.launcher", &tail)) { 2717 2718 // add all jvm options to the jvm_args string. This string 2719 // is used later to set the java.vm.args PerfData string constant. 2720 // the -Djava.class.path and the -Dsun.java.command options are 2721 // omitted from jvm_args string as each have their own PerfData 2722 // string constant object. 2723 build_jvm_args(option->optionString); 2724 } 2725 2726 // -verbose:[class/gc/jni] 2727 if (match_option(option, "-verbose", &tail)) { 2728 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2729 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2730 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2731 } else if (!strcmp(tail, ":gc")) { 2732 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2733 } else if (!strcmp(tail, ":jni")) { 2734 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2735 return JNI_EINVAL; 2736 } 2737 } 2738 // -da / -ea / -disableassertions / -enableassertions 2739 // These accept an optional class/package name separated by a colon, e.g., 2740 // -da:java.lang.Thread. 2741 } else if (match_option(option, user_assertion_options, &tail, true)) { 2742 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2743 if (*tail == '\0') { 2744 JavaAssertions::setUserClassDefault(enable); 2745 } else { 2746 assert(*tail == ':', "bogus match by match_option()"); 2747 JavaAssertions::addOption(tail + 1, enable); 2748 } 2749 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2750 } else if (match_option(option, system_assertion_options, &tail, false)) { 2751 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2752 JavaAssertions::setSystemClassDefault(enable); 2753 // -bootclasspath: 2754 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2755 jio_fprintf(defaultStream::output_stream(), 2756 "-Xbootclasspath is no longer a supported option.\n"); 2757 return JNI_EINVAL; 2758 // -bootclasspath/a: 2759 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2760 Arguments::append_sysclasspath(tail); 2761 // -bootclasspath/p: 2762 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2763 jio_fprintf(defaultStream::output_stream(), 2764 "-Xbootclasspath/p is no longer a supported option.\n"); 2765 return JNI_EINVAL; 2766 // -Xrun 2767 } else if (match_option(option, "-Xrun", &tail)) { 2768 if (tail != NULL) { 2769 const char* pos = strchr(tail, ':'); 2770 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2771 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2772 jio_snprintf(name, len + 1, "%s", tail); 2773 2774 char *options = NULL; 2775 if(pos != NULL) { 2776 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2777 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2778 } 2779 #if !INCLUDE_JVMTI 2780 if (strcmp(name, "jdwp") == 0) { 2781 jio_fprintf(defaultStream::error_stream(), 2782 "Debugging agents are not supported in this VM\n"); 2783 return JNI_ERR; 2784 } 2785 #endif // !INCLUDE_JVMTI 2786 add_init_library(name, options); 2787 } 2788 } else if (match_option(option, "--add-reads=", &tail)) { 2789 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2790 return JNI_ENOMEM; 2791 } 2792 } else if (match_option(option, "--add-exports=", &tail)) { 2793 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2794 return JNI_ENOMEM; 2795 } 2796 } else if (match_option(option, "--add-opens=", &tail)) { 2797 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2798 return JNI_ENOMEM; 2799 } 2800 } else if (match_option(option, "--add-modules=", &tail)) { 2801 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2802 return JNI_ENOMEM; 2803 } 2804 } else if (match_option(option, "--limit-modules=", &tail)) { 2805 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2806 return JNI_ENOMEM; 2807 } 2808 } else if (match_option(option, "--module-path=", &tail)) { 2809 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2810 return JNI_ENOMEM; 2811 } 2812 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2813 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2814 return JNI_ENOMEM; 2815 } 2816 } else if (match_option(option, "--patch-module=", &tail)) { 2817 // --patch-module=<module>=<file>(<pathsep><file>)* 2818 int res = process_patch_mod_option(tail, patch_mod_javabase); 2819 if (res != JNI_OK) { 2820 return res; 2821 } 2822 // -agentlib and -agentpath 2823 } else if (match_option(option, "-agentlib:", &tail) || 2824 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2825 if(tail != NULL) { 2826 const char* pos = strchr(tail, '='); 2827 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2828 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2829 name[len] = '\0'; 2830 2831 char *options = NULL; 2832 if(pos != NULL) { 2833 options = os::strdup_check_oom(pos + 1, mtArguments); 2834 } 2835 #if !INCLUDE_JVMTI 2836 if (valid_jdwp_agent(name, is_absolute_path)) { 2837 jio_fprintf(defaultStream::error_stream(), 2838 "Debugging agents are not supported in this VM\n"); 2839 return JNI_ERR; 2840 } 2841 #endif // !INCLUDE_JVMTI 2842 add_init_agent(name, options, is_absolute_path); 2843 } 2844 // -javaagent 2845 } else if (match_option(option, "-javaagent:", &tail)) { 2846 #if !INCLUDE_JVMTI 2847 jio_fprintf(defaultStream::error_stream(), 2848 "Instrumentation agents are not supported in this VM\n"); 2849 return JNI_ERR; 2850 #else 2851 if (tail != NULL) { 2852 size_t length = strlen(tail) + 1; 2853 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2854 jio_snprintf(options, length, "%s", tail); 2855 add_init_agent("instrument", options, false); 2856 // java agents need module java.instrument 2857 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2858 return JNI_ENOMEM; 2859 } 2860 } 2861 #endif // !INCLUDE_JVMTI 2862 // -Xnoclassgc 2863 } else if (match_option(option, "-Xnoclassgc")) { 2864 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2865 return JNI_EINVAL; 2866 } 2867 // -Xconcgc 2868 } else if (match_option(option, "-Xconcgc")) { 2869 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2870 return JNI_EINVAL; 2871 } 2872 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2873 // -Xnoconcgc 2874 } else if (match_option(option, "-Xnoconcgc")) { 2875 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2876 return JNI_EINVAL; 2877 } 2878 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2879 // -Xbatch 2880 } else if (match_option(option, "-Xbatch")) { 2881 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2882 return JNI_EINVAL; 2883 } 2884 // -Xmn for compatibility with other JVM vendors 2885 } else if (match_option(option, "-Xmn", &tail)) { 2886 julong long_initial_young_size = 0; 2887 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2888 if (errcode != arg_in_range) { 2889 jio_fprintf(defaultStream::error_stream(), 2890 "Invalid initial young generation size: %s\n", option->optionString); 2891 describe_range_error(errcode); 2892 return JNI_EINVAL; 2893 } 2894 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2895 return JNI_EINVAL; 2896 } 2897 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2898 return JNI_EINVAL; 2899 } 2900 // -Xms 2901 } else if (match_option(option, "-Xms", &tail)) { 2902 julong long_initial_heap_size = 0; 2903 // an initial heap size of 0 means automatically determine 2904 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2905 if (errcode != arg_in_range) { 2906 jio_fprintf(defaultStream::error_stream(), 2907 "Invalid initial heap size: %s\n", option->optionString); 2908 describe_range_error(errcode); 2909 return JNI_EINVAL; 2910 } 2911 set_min_heap_size((size_t)long_initial_heap_size); 2912 // Currently the minimum size and the initial heap sizes are the same. 2913 // Can be overridden with -XX:InitialHeapSize. 2914 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2915 return JNI_EINVAL; 2916 } 2917 // -Xmx 2918 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2919 julong long_max_heap_size = 0; 2920 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2921 if (errcode != arg_in_range) { 2922 jio_fprintf(defaultStream::error_stream(), 2923 "Invalid maximum heap size: %s\n", option->optionString); 2924 describe_range_error(errcode); 2925 return JNI_EINVAL; 2926 } 2927 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2928 return JNI_EINVAL; 2929 } 2930 // Xmaxf 2931 } else if (match_option(option, "-Xmaxf", &tail)) { 2932 char* err; 2933 int maxf = (int)(strtod(tail, &err) * 100); 2934 if (*err != '\0' || *tail == '\0') { 2935 jio_fprintf(defaultStream::error_stream(), 2936 "Bad max heap free percentage size: %s\n", 2937 option->optionString); 2938 return JNI_EINVAL; 2939 } else { 2940 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2941 return JNI_EINVAL; 2942 } 2943 } 2944 // Xminf 2945 } else if (match_option(option, "-Xminf", &tail)) { 2946 char* err; 2947 int minf = (int)(strtod(tail, &err) * 100); 2948 if (*err != '\0' || *tail == '\0') { 2949 jio_fprintf(defaultStream::error_stream(), 2950 "Bad min heap free percentage size: %s\n", 2951 option->optionString); 2952 return JNI_EINVAL; 2953 } else { 2954 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2955 return JNI_EINVAL; 2956 } 2957 } 2958 // -Xss 2959 } else if (match_option(option, "-Xss", &tail)) { 2960 julong long_ThreadStackSize = 0; 2961 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2962 if (errcode != arg_in_range) { 2963 jio_fprintf(defaultStream::error_stream(), 2964 "Invalid thread stack size: %s\n", option->optionString); 2965 describe_range_error(errcode); 2966 return JNI_EINVAL; 2967 } 2968 // Internally track ThreadStackSize in units of 1024 bytes. 2969 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2970 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2971 return JNI_EINVAL; 2972 } 2973 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 2974 } else if (match_option(option, "-Xoss", &tail) || 2975 match_option(option, "-Xsqnopause") || 2976 match_option(option, "-Xoptimize") || 2977 match_option(option, "-Xboundthreads") || 2978 match_option(option, "-Xusealtsigs")) { 2979 // All these options are deprecated in JDK 9 and will be removed in a future release 2980 char version[256]; 2981 JDK_Version::jdk(9).to_string(version, sizeof(version)); 2982 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2983 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2984 julong long_CodeCacheExpansionSize = 0; 2985 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2986 if (errcode != arg_in_range) { 2987 jio_fprintf(defaultStream::error_stream(), 2988 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2989 os::vm_page_size()/K); 2990 return JNI_EINVAL; 2991 } 2992 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 2993 return JNI_EINVAL; 2994 } 2995 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2996 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2997 julong long_ReservedCodeCacheSize = 0; 2998 2999 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3000 if (errcode != arg_in_range) { 3001 jio_fprintf(defaultStream::error_stream(), 3002 "Invalid maximum code cache size: %s.\n", option->optionString); 3003 return JNI_EINVAL; 3004 } 3005 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3006 return JNI_EINVAL; 3007 } 3008 // -XX:NonNMethodCodeHeapSize= 3009 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3010 julong long_NonNMethodCodeHeapSize = 0; 3011 3012 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3013 if (errcode != arg_in_range) { 3014 jio_fprintf(defaultStream::error_stream(), 3015 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3016 return JNI_EINVAL; 3017 } 3018 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3019 return JNI_EINVAL; 3020 } 3021 // -XX:ProfiledCodeHeapSize= 3022 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3023 julong long_ProfiledCodeHeapSize = 0; 3024 3025 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3026 if (errcode != arg_in_range) { 3027 jio_fprintf(defaultStream::error_stream(), 3028 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3029 return JNI_EINVAL; 3030 } 3031 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3032 return JNI_EINVAL; 3033 } 3034 // -XX:NonProfiledCodeHeapSizee= 3035 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3036 julong long_NonProfiledCodeHeapSize = 0; 3037 3038 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3039 if (errcode != arg_in_range) { 3040 jio_fprintf(defaultStream::error_stream(), 3041 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3042 return JNI_EINVAL; 3043 } 3044 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3045 return JNI_EINVAL; 3046 } 3047 // -green 3048 } else if (match_option(option, "-green")) { 3049 jio_fprintf(defaultStream::error_stream(), 3050 "Green threads support not available\n"); 3051 return JNI_EINVAL; 3052 // -native 3053 } else if (match_option(option, "-native")) { 3054 // HotSpot always uses native threads, ignore silently for compatibility 3055 // -Xrs 3056 } else if (match_option(option, "-Xrs")) { 3057 // Classic/EVM option, new functionality 3058 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3059 return JNI_EINVAL; 3060 } 3061 // -Xprof 3062 } else if (match_option(option, "-Xprof")) { 3063 #if INCLUDE_FPROF 3064 _has_profile = true; 3065 #else // INCLUDE_FPROF 3066 jio_fprintf(defaultStream::error_stream(), 3067 "Flat profiling is not supported in this VM.\n"); 3068 return JNI_ERR; 3069 #endif // INCLUDE_FPROF 3070 // -Xconcurrentio 3071 } else if (match_option(option, "-Xconcurrentio")) { 3072 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3073 return JNI_EINVAL; 3074 } 3075 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3076 return JNI_EINVAL; 3077 } 3078 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3079 return JNI_EINVAL; 3080 } 3081 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3082 return JNI_EINVAL; 3083 } 3084 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3085 return JNI_EINVAL; 3086 } 3087 3088 // -Xinternalversion 3089 } else if (match_option(option, "-Xinternalversion")) { 3090 jio_fprintf(defaultStream::output_stream(), "%s\n", 3091 VM_Version::internal_vm_info_string()); 3092 vm_exit(0); 3093 #ifndef PRODUCT 3094 // -Xprintflags 3095 } else if (match_option(option, "-Xprintflags")) { 3096 CommandLineFlags::printFlags(tty, false); 3097 vm_exit(0); 3098 #endif 3099 // -D 3100 } else if (match_option(option, "-D", &tail)) { 3101 const char* value; 3102 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3103 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3104 // abort if -Djava.endorsed.dirs is set 3105 jio_fprintf(defaultStream::output_stream(), 3106 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3107 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3108 return JNI_EINVAL; 3109 } 3110 if (match_option(option, "-Djava.ext.dirs=", &value) && 3111 *value != '\0' && strcmp(value, "\"\"") != 0) { 3112 // abort if -Djava.ext.dirs is set 3113 jio_fprintf(defaultStream::output_stream(), 3114 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3115 return JNI_EINVAL; 3116 } 3117 // Check for module related properties. They must be set using the modules 3118 // options. For example: use "--add-modules=java.sql", not 3119 // "-Djdk.module.addmods=java.sql" 3120 if (is_internal_module_property(option->optionString + 2)) { 3121 needs_module_property_warning = true; 3122 continue; 3123 } 3124 3125 if (!add_property(tail)) { 3126 return JNI_ENOMEM; 3127 } 3128 // Out of the box management support 3129 if (match_option(option, "-Dcom.sun.management", &tail)) { 3130 #if INCLUDE_MANAGEMENT 3131 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3132 return JNI_EINVAL; 3133 } 3134 // management agent in module java.management 3135 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) { 3136 return JNI_ENOMEM; 3137 } 3138 #else 3139 jio_fprintf(defaultStream::output_stream(), 3140 "-Dcom.sun.management is not supported in this VM.\n"); 3141 return JNI_ERR; 3142 #endif 3143 } 3144 // -Xint 3145 } else if (match_option(option, "-Xint")) { 3146 set_mode_flags(_int); 3147 // -Xmixed 3148 } else if (match_option(option, "-Xmixed")) { 3149 set_mode_flags(_mixed); 3150 // -Xcomp 3151 } else if (match_option(option, "-Xcomp")) { 3152 // for testing the compiler; turn off all flags that inhibit compilation 3153 set_mode_flags(_comp); 3154 // -Xshare:dump 3155 } else if (match_option(option, "-Xshare:dump")) { 3156 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3157 return JNI_EINVAL; 3158 } 3159 set_mode_flags(_int); // Prevent compilation, which creates objects 3160 // -Xshare:on 3161 } else if (match_option(option, "-Xshare:on")) { 3162 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3163 return JNI_EINVAL; 3164 } 3165 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3166 return JNI_EINVAL; 3167 } 3168 // -Xshare:auto 3169 } else if (match_option(option, "-Xshare:auto")) { 3170 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3171 return JNI_EINVAL; 3172 } 3173 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3174 return JNI_EINVAL; 3175 } 3176 // -Xshare:off 3177 } else if (match_option(option, "-Xshare:off")) { 3178 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3179 return JNI_EINVAL; 3180 } 3181 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3182 return JNI_EINVAL; 3183 } 3184 // -Xverify 3185 } else if (match_option(option, "-Xverify", &tail)) { 3186 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3187 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3188 return JNI_EINVAL; 3189 } 3190 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3191 return JNI_EINVAL; 3192 } 3193 } else if (strcmp(tail, ":remote") == 0) { 3194 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3195 return JNI_EINVAL; 3196 } 3197 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3198 return JNI_EINVAL; 3199 } 3200 } else if (strcmp(tail, ":none") == 0) { 3201 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3202 return JNI_EINVAL; 3203 } 3204 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3205 return JNI_EINVAL; 3206 } 3207 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3208 return JNI_EINVAL; 3209 } 3210 // -Xdebug 3211 } else if (match_option(option, "-Xdebug")) { 3212 // note this flag has been used, then ignore 3213 set_xdebug_mode(true); 3214 // -Xnoagent 3215 } else if (match_option(option, "-Xnoagent")) { 3216 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3217 } else if (match_option(option, "-Xloggc:", &tail)) { 3218 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3219 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3220 _gc_log_filename = os::strdup_check_oom(tail); 3221 } else if (match_option(option, "-Xlog", &tail)) { 3222 bool ret = false; 3223 if (strcmp(tail, ":help") == 0) { 3224 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3225 vm_exit(0); 3226 } else if (strcmp(tail, ":disable") == 0) { 3227 LogConfiguration::disable_logging(); 3228 ret = true; 3229 } else if (*tail == '\0') { 3230 ret = LogConfiguration::parse_command_line_arguments(); 3231 assert(ret, "-Xlog without arguments should never fail to parse"); 3232 } else if (*tail == ':') { 3233 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3234 } 3235 if (ret == false) { 3236 jio_fprintf(defaultStream::error_stream(), 3237 "Invalid -Xlog option '-Xlog%s'\n", 3238 tail); 3239 return JNI_EINVAL; 3240 } 3241 // JNI hooks 3242 } else if (match_option(option, "-Xcheck", &tail)) { 3243 if (!strcmp(tail, ":jni")) { 3244 #if !INCLUDE_JNI_CHECK 3245 warning("JNI CHECKING is not supported in this VM"); 3246 #else 3247 CheckJNICalls = true; 3248 #endif // INCLUDE_JNI_CHECK 3249 } else if (is_bad_option(option, args->ignoreUnrecognized, 3250 "check")) { 3251 return JNI_EINVAL; 3252 } 3253 } else if (match_option(option, "vfprintf")) { 3254 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3255 } else if (match_option(option, "exit")) { 3256 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3257 } else if (match_option(option, "abort")) { 3258 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3259 // -XX:+AggressiveHeap 3260 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3261 jint result = set_aggressive_heap_flags(); 3262 if (result != JNI_OK) { 3263 return result; 3264 } 3265 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3266 // and the last option wins. 3267 } else if (match_option(option, "-XX:+NeverTenure")) { 3268 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3269 return JNI_EINVAL; 3270 } 3271 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3272 return JNI_EINVAL; 3273 } 3274 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3275 return JNI_EINVAL; 3276 } 3277 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3278 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3279 return JNI_EINVAL; 3280 } 3281 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3282 return JNI_EINVAL; 3283 } 3284 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3285 return JNI_EINVAL; 3286 } 3287 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3288 uintx max_tenuring_thresh = 0; 3289 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3290 jio_fprintf(defaultStream::error_stream(), 3291 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3292 return JNI_EINVAL; 3293 } 3294 3295 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3296 return JNI_EINVAL; 3297 } 3298 3299 if (MaxTenuringThreshold == 0) { 3300 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3301 return JNI_EINVAL; 3302 } 3303 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3304 return JNI_EINVAL; 3305 } 3306 } else { 3307 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3308 return JNI_EINVAL; 3309 } 3310 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3311 return JNI_EINVAL; 3312 } 3313 } 3314 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3315 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3316 return JNI_EINVAL; 3317 } 3318 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3319 return JNI_EINVAL; 3320 } 3321 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3322 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3323 return JNI_EINVAL; 3324 } 3325 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3326 return JNI_EINVAL; 3327 } 3328 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3329 #if defined(DTRACE_ENABLED) 3330 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3331 return JNI_EINVAL; 3332 } 3333 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3334 return JNI_EINVAL; 3335 } 3336 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3337 return JNI_EINVAL; 3338 } 3339 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3340 return JNI_EINVAL; 3341 } 3342 #else // defined(DTRACE_ENABLED) 3343 jio_fprintf(defaultStream::error_stream(), 3344 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3345 return JNI_EINVAL; 3346 #endif // defined(DTRACE_ENABLED) 3347 #ifdef ASSERT 3348 } else if (match_option(option, "-XX:+FullGCALot")) { 3349 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3350 return JNI_EINVAL; 3351 } 3352 // disable scavenge before parallel mark-compact 3353 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3354 return JNI_EINVAL; 3355 } 3356 #endif 3357 #if !INCLUDE_MANAGEMENT 3358 } else if (match_option(option, "-XX:+ManagementServer")) { 3359 jio_fprintf(defaultStream::error_stream(), 3360 "ManagementServer is not supported in this VM.\n"); 3361 return JNI_ERR; 3362 #endif // INCLUDE_MANAGEMENT 3363 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3364 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3365 // already been handled 3366 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3367 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3368 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3369 return JNI_EINVAL; 3370 } 3371 } 3372 // Unknown option 3373 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3374 return JNI_ERR; 3375 } 3376 } 3377 3378 // PrintSharedArchiveAndExit will turn on 3379 // -Xshare:on 3380 // -Xlog:class+path=info 3381 if (PrintSharedArchiveAndExit) { 3382 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3383 return JNI_EINVAL; 3384 } 3385 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3386 return JNI_EINVAL; 3387 } 3388 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3389 } 3390 3391 // Change the default value for flags which have different default values 3392 // when working with older JDKs. 3393 #ifdef LINUX 3394 if (JDK_Version::current().compare_major(6) <= 0 && 3395 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3396 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3397 } 3398 #endif // LINUX 3399 fix_appclasspath(); 3400 return JNI_OK; 3401 } 3402 3403 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3404 // For java.base check for duplicate --patch-module options being specified on the command line. 3405 // This check is only required for java.base, all other duplicate module specifications 3406 // will be checked during module system initialization. The module system initialization 3407 // will throw an ExceptionInInitializerError if this situation occurs. 3408 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3409 if (*patch_mod_javabase) { 3410 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3411 } else { 3412 *patch_mod_javabase = true; 3413 } 3414 } 3415 3416 // Create GrowableArray lazily, only if --patch-module has been specified 3417 if (_patch_mod_prefix == NULL) { 3418 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3419 } 3420 3421 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3422 } 3423 3424 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3425 // 3426 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3427 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3428 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3429 // path is treated as the current directory. 3430 // 3431 // This causes problems with CDS, which requires that all directories specified in the classpath 3432 // must be empty. In most cases, applications do NOT want to load classes from the current 3433 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3434 // scripts compatible with CDS. 3435 void Arguments::fix_appclasspath() { 3436 if (IgnoreEmptyClassPaths) { 3437 const char separator = *os::path_separator(); 3438 const char* src = _java_class_path->value(); 3439 3440 // skip over all the leading empty paths 3441 while (*src == separator) { 3442 src ++; 3443 } 3444 3445 char* copy = os::strdup_check_oom(src, mtArguments); 3446 3447 // trim all trailing empty paths 3448 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3449 *tail = '\0'; 3450 } 3451 3452 char from[3] = {separator, separator, '\0'}; 3453 char to [2] = {separator, '\0'}; 3454 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3455 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3456 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3457 } 3458 3459 _java_class_path->set_writeable_value(copy); 3460 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3461 } 3462 } 3463 3464 static bool has_jar_files(const char* directory) { 3465 DIR* dir = os::opendir(directory); 3466 if (dir == NULL) return false; 3467 3468 struct dirent *entry; 3469 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3470 bool hasJarFile = false; 3471 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3472 const char* name = entry->d_name; 3473 const char* ext = name + strlen(name) - 4; 3474 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3475 } 3476 FREE_C_HEAP_ARRAY(char, dbuf); 3477 os::closedir(dir); 3478 return hasJarFile ; 3479 } 3480 3481 static int check_non_empty_dirs(const char* path) { 3482 const char separator = *os::path_separator(); 3483 const char* const end = path + strlen(path); 3484 int nonEmptyDirs = 0; 3485 while (path < end) { 3486 const char* tmp_end = strchr(path, separator); 3487 if (tmp_end == NULL) { 3488 if (has_jar_files(path)) { 3489 nonEmptyDirs++; 3490 jio_fprintf(defaultStream::output_stream(), 3491 "Non-empty directory: %s\n", path); 3492 } 3493 path = end; 3494 } else { 3495 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3496 memcpy(dirpath, path, tmp_end - path); 3497 dirpath[tmp_end - path] = '\0'; 3498 if (has_jar_files(dirpath)) { 3499 nonEmptyDirs++; 3500 jio_fprintf(defaultStream::output_stream(), 3501 "Non-empty directory: %s\n", dirpath); 3502 } 3503 FREE_C_HEAP_ARRAY(char, dirpath); 3504 path = tmp_end + 1; 3505 } 3506 } 3507 return nonEmptyDirs; 3508 } 3509 3510 jint Arguments::finalize_vm_init_args() { 3511 // check if the default lib/endorsed directory exists; if so, error 3512 char path[JVM_MAXPATHLEN]; 3513 const char* fileSep = os::file_separator(); 3514 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3515 3516 if (CheckEndorsedAndExtDirs) { 3517 int nonEmptyDirs = 0; 3518 // check endorsed directory 3519 nonEmptyDirs += check_non_empty_dirs(path); 3520 // check the extension directories 3521 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3522 if (nonEmptyDirs > 0) { 3523 return JNI_ERR; 3524 } 3525 } 3526 3527 DIR* dir = os::opendir(path); 3528 if (dir != NULL) { 3529 jio_fprintf(defaultStream::output_stream(), 3530 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3531 "in modular form will be supported via the concept of upgradeable modules.\n"); 3532 os::closedir(dir); 3533 return JNI_ERR; 3534 } 3535 3536 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3537 dir = os::opendir(path); 3538 if (dir != NULL) { 3539 jio_fprintf(defaultStream::output_stream(), 3540 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3541 "Use -classpath instead.\n."); 3542 os::closedir(dir); 3543 return JNI_ERR; 3544 } 3545 3546 // This must be done after all arguments have been processed. 3547 // java_compiler() true means set to "NONE" or empty. 3548 if (java_compiler() && !xdebug_mode()) { 3549 // For backwards compatibility, we switch to interpreted mode if 3550 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3551 // not specified. 3552 set_mode_flags(_int); 3553 } 3554 3555 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3556 // but like -Xint, leave compilation thresholds unaffected. 3557 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3558 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3559 set_mode_flags(_int); 3560 } 3561 3562 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3563 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3564 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3565 } 3566 3567 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3568 // Don't degrade server performance for footprint 3569 if (FLAG_IS_DEFAULT(UseLargePages) && 3570 MaxHeapSize < LargePageHeapSizeThreshold) { 3571 // No need for large granularity pages w/small heaps. 3572 // Note that large pages are enabled/disabled for both the 3573 // Java heap and the code cache. 3574 FLAG_SET_DEFAULT(UseLargePages, false); 3575 } 3576 3577 #elif defined(COMPILER2) 3578 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3579 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3580 } 3581 #endif 3582 3583 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3584 UNSUPPORTED_OPTION(ProfileInterpreter); 3585 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3586 #endif 3587 3588 #ifndef TIERED 3589 // Tiered compilation is undefined. 3590 UNSUPPORTED_OPTION(TieredCompilation); 3591 #endif 3592 3593 #if INCLUDE_JVMCI 3594 if (EnableJVMCI && 3595 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) { 3596 return JNI_ENOMEM; 3597 } 3598 #endif 3599 3600 // If we are running in a headless jre, force java.awt.headless property 3601 // to be true unless the property has already been set. 3602 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3603 if (os::is_headless_jre()) { 3604 const char* headless = Arguments::get_property("java.awt.headless"); 3605 if (headless == NULL) { 3606 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3607 if (headless_env == NULL) { 3608 if (!add_property("java.awt.headless=true")) { 3609 return JNI_ENOMEM; 3610 } 3611 } else { 3612 char buffer[256]; 3613 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3614 if (!add_property(buffer)) { 3615 return JNI_ENOMEM; 3616 } 3617 } 3618 } 3619 } 3620 3621 if (!check_vm_args_consistency()) { 3622 return JNI_ERR; 3623 } 3624 3625 return JNI_OK; 3626 } 3627 3628 // Helper class for controlling the lifetime of JavaVMInitArgs 3629 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3630 // deleted on the destruction of the ScopedVMInitArgs object. 3631 class ScopedVMInitArgs : public StackObj { 3632 private: 3633 JavaVMInitArgs _args; 3634 char* _container_name; 3635 bool _is_set; 3636 char* _vm_options_file_arg; 3637 3638 public: 3639 ScopedVMInitArgs(const char *container_name) { 3640 _args.version = JNI_VERSION_1_2; 3641 _args.nOptions = 0; 3642 _args.options = NULL; 3643 _args.ignoreUnrecognized = false; 3644 _container_name = (char *)container_name; 3645 _is_set = false; 3646 _vm_options_file_arg = NULL; 3647 } 3648 3649 // Populates the JavaVMInitArgs object represented by this 3650 // ScopedVMInitArgs object with the arguments in options. The 3651 // allocated memory is deleted by the destructor. If this method 3652 // returns anything other than JNI_OK, then this object is in a 3653 // partially constructed state, and should be abandoned. 3654 jint set_args(GrowableArray<JavaVMOption>* options) { 3655 _is_set = true; 3656 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3657 JavaVMOption, options->length(), mtArguments); 3658 if (options_arr == NULL) { 3659 return JNI_ENOMEM; 3660 } 3661 _args.options = options_arr; 3662 3663 for (int i = 0; i < options->length(); i++) { 3664 options_arr[i] = options->at(i); 3665 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3666 if (options_arr[i].optionString == NULL) { 3667 // Rely on the destructor to do cleanup. 3668 _args.nOptions = i; 3669 return JNI_ENOMEM; 3670 } 3671 } 3672 3673 _args.nOptions = options->length(); 3674 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3675 return JNI_OK; 3676 } 3677 3678 JavaVMInitArgs* get() { return &_args; } 3679 char* container_name() { return _container_name; } 3680 bool is_set() { return _is_set; } 3681 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3682 char* vm_options_file_arg() { return _vm_options_file_arg; } 3683 3684 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3685 if (_vm_options_file_arg != NULL) { 3686 os::free(_vm_options_file_arg); 3687 } 3688 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3689 } 3690 3691 ~ScopedVMInitArgs() { 3692 if (_vm_options_file_arg != NULL) { 3693 os::free(_vm_options_file_arg); 3694 } 3695 if (_args.options == NULL) return; 3696 for (int i = 0; i < _args.nOptions; i++) { 3697 os::free(_args.options[i].optionString); 3698 } 3699 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3700 } 3701 3702 // Insert options into this option list, to replace option at 3703 // vm_options_file_pos (-XX:VMOptionsFile) 3704 jint insert(const JavaVMInitArgs* args, 3705 const JavaVMInitArgs* args_to_insert, 3706 const int vm_options_file_pos) { 3707 assert(_args.options == NULL, "shouldn't be set yet"); 3708 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3709 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3710 3711 int length = args->nOptions + args_to_insert->nOptions - 1; 3712 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3713 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3714 for (int i = 0; i < args->nOptions; i++) { 3715 if (i == vm_options_file_pos) { 3716 // insert the new options starting at the same place as the 3717 // -XX:VMOptionsFile option 3718 for (int j = 0; j < args_to_insert->nOptions; j++) { 3719 options->push(args_to_insert->options[j]); 3720 } 3721 } else { 3722 options->push(args->options[i]); 3723 } 3724 } 3725 // make into options array 3726 jint result = set_args(options); 3727 delete options; 3728 return result; 3729 } 3730 }; 3731 3732 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3733 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3734 } 3735 3736 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3737 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3738 } 3739 3740 jint Arguments::parse_options_environment_variable(const char* name, 3741 ScopedVMInitArgs* vm_args) { 3742 char *buffer = ::getenv(name); 3743 3744 // Don't check this environment variable if user has special privileges 3745 // (e.g. unix su command). 3746 if (buffer == NULL || os::have_special_privileges()) { 3747 return JNI_OK; 3748 } 3749 3750 if ((buffer = os::strdup(buffer)) == NULL) { 3751 return JNI_ENOMEM; 3752 } 3753 3754 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3755 3756 os::free(buffer); 3757 return retcode; 3758 } 3759 3760 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3761 // read file into buffer 3762 int fd = ::open(file_name, O_RDONLY); 3763 if (fd < 0) { 3764 jio_fprintf(defaultStream::error_stream(), 3765 "Could not open options file '%s'\n", 3766 file_name); 3767 return JNI_ERR; 3768 } 3769 3770 struct stat stbuf; 3771 int retcode = os::stat(file_name, &stbuf); 3772 if (retcode != 0) { 3773 jio_fprintf(defaultStream::error_stream(), 3774 "Could not stat options file '%s'\n", 3775 file_name); 3776 os::close(fd); 3777 return JNI_ERR; 3778 } 3779 3780 if (stbuf.st_size == 0) { 3781 // tell caller there is no option data and that is ok 3782 os::close(fd); 3783 return JNI_OK; 3784 } 3785 3786 // '+ 1' for NULL termination even with max bytes 3787 size_t bytes_alloc = stbuf.st_size + 1; 3788 3789 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3790 if (NULL == buf) { 3791 jio_fprintf(defaultStream::error_stream(), 3792 "Could not allocate read buffer for options file parse\n"); 3793 os::close(fd); 3794 return JNI_ENOMEM; 3795 } 3796 3797 memset(buf, 0, bytes_alloc); 3798 3799 // Fill buffer 3800 // Use ::read() instead of os::read because os::read() 3801 // might do a thread state transition 3802 // and it is too early for that here 3803 3804 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3805 os::close(fd); 3806 if (bytes_read < 0) { 3807 FREE_C_HEAP_ARRAY(char, buf); 3808 jio_fprintf(defaultStream::error_stream(), 3809 "Could not read options file '%s'\n", file_name); 3810 return JNI_ERR; 3811 } 3812 3813 if (bytes_read == 0) { 3814 // tell caller there is no option data and that is ok 3815 FREE_C_HEAP_ARRAY(char, buf); 3816 return JNI_OK; 3817 } 3818 3819 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3820 3821 FREE_C_HEAP_ARRAY(char, buf); 3822 return retcode; 3823 } 3824 3825 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3826 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3827 3828 // some pointers to help with parsing 3829 char *buffer_end = buffer + buf_len; 3830 char *opt_hd = buffer; 3831 char *wrt = buffer; 3832 char *rd = buffer; 3833 3834 // parse all options 3835 while (rd < buffer_end) { 3836 // skip leading white space from the input string 3837 while (rd < buffer_end && isspace(*rd)) { 3838 rd++; 3839 } 3840 3841 if (rd >= buffer_end) { 3842 break; 3843 } 3844 3845 // Remember this is where we found the head of the token. 3846 opt_hd = wrt; 3847 3848 // Tokens are strings of non white space characters separated 3849 // by one or more white spaces. 3850 while (rd < buffer_end && !isspace(*rd)) { 3851 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3852 int quote = *rd; // matching quote to look for 3853 rd++; // don't copy open quote 3854 while (rd < buffer_end && *rd != quote) { 3855 // include everything (even spaces) 3856 // up until the close quote 3857 *wrt++ = *rd++; // copy to option string 3858 } 3859 3860 if (rd < buffer_end) { 3861 rd++; // don't copy close quote 3862 } else { 3863 // did not see closing quote 3864 jio_fprintf(defaultStream::error_stream(), 3865 "Unmatched quote in %s\n", name); 3866 delete options; 3867 return JNI_ERR; 3868 } 3869 } else { 3870 *wrt++ = *rd++; // copy to option string 3871 } 3872 } 3873 3874 // steal a white space character and set it to NULL 3875 *wrt++ = '\0'; 3876 // We now have a complete token 3877 3878 JavaVMOption option; 3879 option.optionString = opt_hd; 3880 option.extraInfo = NULL; 3881 3882 options->append(option); // Fill in option 3883 3884 rd++; // Advance to next character 3885 } 3886 3887 // Fill out JavaVMInitArgs structure. 3888 jint status = vm_args->set_args(options); 3889 3890 delete options; 3891 return status; 3892 } 3893 3894 void Arguments::set_shared_spaces_flags() { 3895 if (DumpSharedSpaces) { 3896 if (FailOverToOldVerifier) { 3897 // Don't fall back to the old verifier on verification failure. If a 3898 // class fails verification with the split verifier, it might fail the 3899 // CDS runtime verifier constraint check. In that case, we don't want 3900 // to share the class. We only archive classes that pass the split verifier. 3901 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3902 } 3903 3904 if (RequireSharedSpaces) { 3905 warning("Cannot dump shared archive while using shared archive"); 3906 } 3907 UseSharedSpaces = false; 3908 #ifdef _LP64 3909 if (!UseCompressedOops || !UseCompressedClassPointers) { 3910 vm_exit_during_initialization( 3911 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3912 } 3913 } else { 3914 if (!UseCompressedOops || !UseCompressedClassPointers) { 3915 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3916 } 3917 #endif 3918 } 3919 } 3920 3921 // Sharing support 3922 // Construct the path to the archive 3923 static char* get_shared_archive_path() { 3924 char *shared_archive_path; 3925 if (SharedArchiveFile == NULL) { 3926 char jvm_path[JVM_MAXPATHLEN]; 3927 os::jvm_path(jvm_path, sizeof(jvm_path)); 3928 char *end = strrchr(jvm_path, *os::file_separator()); 3929 if (end != NULL) *end = '\0'; 3930 size_t jvm_path_len = strlen(jvm_path); 3931 size_t file_sep_len = strlen(os::file_separator()); 3932 const size_t len = jvm_path_len + file_sep_len + 20; 3933 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3934 if (shared_archive_path != NULL) { 3935 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3936 jvm_path, os::file_separator()); 3937 } 3938 } else { 3939 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3940 } 3941 return shared_archive_path; 3942 } 3943 3944 #ifndef PRODUCT 3945 // Determine whether LogVMOutput should be implicitly turned on. 3946 static bool use_vm_log() { 3947 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3948 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3949 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3950 PrintAssembly || TraceDeoptimization || TraceDependencies || 3951 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3952 return true; 3953 } 3954 3955 #ifdef COMPILER1 3956 if (PrintC1Statistics) { 3957 return true; 3958 } 3959 #endif // COMPILER1 3960 3961 #ifdef COMPILER2 3962 if (PrintOptoAssembly || PrintOptoStatistics) { 3963 return true; 3964 } 3965 #endif // COMPILER2 3966 3967 return false; 3968 } 3969 3970 #endif // PRODUCT 3971 3972 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3973 for (int index = 0; index < args->nOptions; index++) { 3974 const JavaVMOption* option = args->options + index; 3975 const char* tail; 3976 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3977 return true; 3978 } 3979 } 3980 return false; 3981 } 3982 3983 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3984 const char* vm_options_file, 3985 const int vm_options_file_pos, 3986 ScopedVMInitArgs* vm_options_file_args, 3987 ScopedVMInitArgs* args_out) { 3988 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3989 if (code != JNI_OK) { 3990 return code; 3991 } 3992 3993 if (vm_options_file_args->get()->nOptions < 1) { 3994 return JNI_OK; 3995 } 3996 3997 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3998 jio_fprintf(defaultStream::error_stream(), 3999 "A VM options file may not refer to a VM options file. " 4000 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4001 "options file '%s' in options container '%s' is an error.\n", 4002 vm_options_file_args->vm_options_file_arg(), 4003 vm_options_file_args->container_name()); 4004 return JNI_EINVAL; 4005 } 4006 4007 return args_out->insert(args, vm_options_file_args->get(), 4008 vm_options_file_pos); 4009 } 4010 4011 // Expand -XX:VMOptionsFile found in args_in as needed. 4012 // mod_args and args_out parameters may return values as needed. 4013 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4014 ScopedVMInitArgs* mod_args, 4015 JavaVMInitArgs** args_out) { 4016 jint code = match_special_option_and_act(args_in, mod_args); 4017 if (code != JNI_OK) { 4018 return code; 4019 } 4020 4021 if (mod_args->is_set()) { 4022 // args_in contains -XX:VMOptionsFile and mod_args contains the 4023 // original options from args_in along with the options expanded 4024 // from the VMOptionsFile. Return a short-hand to the caller. 4025 *args_out = mod_args->get(); 4026 } else { 4027 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4028 } 4029 return JNI_OK; 4030 } 4031 4032 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4033 ScopedVMInitArgs* args_out) { 4034 // Remaining part of option string 4035 const char* tail; 4036 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4037 4038 for (int index = 0; index < args->nOptions; index++) { 4039 const JavaVMOption* option = args->options + index; 4040 if (ArgumentsExt::process_options(option)) { 4041 continue; 4042 } 4043 if (match_option(option, "-XX:Flags=", &tail)) { 4044 Arguments::set_jvm_flags_file(tail); 4045 continue; 4046 } 4047 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4048 if (vm_options_file_args.found_vm_options_file_arg()) { 4049 jio_fprintf(defaultStream::error_stream(), 4050 "The option '%s' is already specified in the options " 4051 "container '%s' so the specification of '%s' in the " 4052 "same options container is an error.\n", 4053 vm_options_file_args.vm_options_file_arg(), 4054 vm_options_file_args.container_name(), 4055 option->optionString); 4056 return JNI_EINVAL; 4057 } 4058 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4059 // If there's a VMOptionsFile, parse that 4060 jint code = insert_vm_options_file(args, tail, index, 4061 &vm_options_file_args, args_out); 4062 if (code != JNI_OK) { 4063 return code; 4064 } 4065 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4066 if (args_out->is_set()) { 4067 // The VMOptions file inserted some options so switch 'args' 4068 // to the new set of options, and continue processing which 4069 // preserves "last option wins" semantics. 4070 args = args_out->get(); 4071 // The first option from the VMOptionsFile replaces the 4072 // current option. So we back track to process the 4073 // replacement option. 4074 index--; 4075 } 4076 continue; 4077 } 4078 if (match_option(option, "-XX:+PrintVMOptions")) { 4079 PrintVMOptions = true; 4080 continue; 4081 } 4082 if (match_option(option, "-XX:-PrintVMOptions")) { 4083 PrintVMOptions = false; 4084 continue; 4085 } 4086 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4087 IgnoreUnrecognizedVMOptions = true; 4088 continue; 4089 } 4090 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4091 IgnoreUnrecognizedVMOptions = false; 4092 continue; 4093 } 4094 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4095 CommandLineFlags::printFlags(tty, false); 4096 vm_exit(0); 4097 } 4098 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4099 #if INCLUDE_NMT 4100 // The launcher did not setup nmt environment variable properly. 4101 if (!MemTracker::check_launcher_nmt_support(tail)) { 4102 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4103 } 4104 4105 // Verify if nmt option is valid. 4106 if (MemTracker::verify_nmt_option()) { 4107 // Late initialization, still in single-threaded mode. 4108 if (MemTracker::tracking_level() >= NMT_summary) { 4109 MemTracker::init(); 4110 } 4111 } else { 4112 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4113 } 4114 continue; 4115 #else 4116 jio_fprintf(defaultStream::error_stream(), 4117 "Native Memory Tracking is not supported in this VM\n"); 4118 return JNI_ERR; 4119 #endif 4120 } 4121 4122 #ifndef PRODUCT 4123 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4124 CommandLineFlags::printFlags(tty, true); 4125 vm_exit(0); 4126 } 4127 #endif 4128 } 4129 return JNI_OK; 4130 } 4131 4132 static void print_options(const JavaVMInitArgs *args) { 4133 const char* tail; 4134 for (int index = 0; index < args->nOptions; index++) { 4135 const JavaVMOption *option = args->options + index; 4136 if (match_option(option, "-XX:", &tail)) { 4137 logOption(tail); 4138 } 4139 } 4140 } 4141 4142 bool Arguments::handle_deprecated_print_gc_flags() { 4143 if (PrintGC) { 4144 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4145 } 4146 if (PrintGCDetails) { 4147 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4148 } 4149 4150 if (_gc_log_filename != NULL) { 4151 // -Xloggc was used to specify a filename 4152 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4153 4154 LogTarget(Error, logging) target; 4155 LogStreamCHeap errstream(target); 4156 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4157 } else if (PrintGC || PrintGCDetails) { 4158 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4159 } 4160 return true; 4161 } 4162 4163 void Arguments::handle_extra_cms_flags(const char* msg) { 4164 SpecialFlag flag; 4165 const char *flag_name = "UseConcMarkSweepGC"; 4166 if (lookup_special_flag(flag_name, flag)) { 4167 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4168 warning("%s", msg); 4169 } 4170 } 4171 4172 // Parse entry point called from JNI_CreateJavaVM 4173 4174 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4175 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4176 4177 // Initialize ranges, constraints and writeables 4178 CommandLineFlagRangeList::init(); 4179 CommandLineFlagConstraintList::init(); 4180 CommandLineFlagWriteableList::init(); 4181 4182 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4183 const char* hotspotrc = ".hotspotrc"; 4184 bool settings_file_specified = false; 4185 bool needs_hotspotrc_warning = false; 4186 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4187 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4188 4189 // Pointers to current working set of containers 4190 JavaVMInitArgs* cur_cmd_args; 4191 JavaVMInitArgs* cur_java_options_args; 4192 JavaVMInitArgs* cur_java_tool_options_args; 4193 4194 // Containers for modified/expanded options 4195 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4196 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4197 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4198 4199 4200 jint code = 4201 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4202 if (code != JNI_OK) { 4203 return code; 4204 } 4205 4206 code = parse_java_options_environment_variable(&initial_java_options_args); 4207 if (code != JNI_OK) { 4208 return code; 4209 } 4210 4211 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4212 &mod_java_tool_options_args, 4213 &cur_java_tool_options_args); 4214 if (code != JNI_OK) { 4215 return code; 4216 } 4217 4218 code = expand_vm_options_as_needed(initial_cmd_args, 4219 &mod_cmd_args, 4220 &cur_cmd_args); 4221 if (code != JNI_OK) { 4222 return code; 4223 } 4224 4225 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4226 &mod_java_options_args, 4227 &cur_java_options_args); 4228 if (code != JNI_OK) { 4229 return code; 4230 } 4231 4232 const char* flags_file = Arguments::get_jvm_flags_file(); 4233 settings_file_specified = (flags_file != NULL); 4234 4235 if (IgnoreUnrecognizedVMOptions) { 4236 cur_cmd_args->ignoreUnrecognized = true; 4237 cur_java_tool_options_args->ignoreUnrecognized = true; 4238 cur_java_options_args->ignoreUnrecognized = true; 4239 } 4240 4241 // Parse specified settings file 4242 if (settings_file_specified) { 4243 if (!process_settings_file(flags_file, true, 4244 cur_cmd_args->ignoreUnrecognized)) { 4245 return JNI_EINVAL; 4246 } 4247 } else { 4248 #ifdef ASSERT 4249 // Parse default .hotspotrc settings file 4250 if (!process_settings_file(".hotspotrc", false, 4251 cur_cmd_args->ignoreUnrecognized)) { 4252 return JNI_EINVAL; 4253 } 4254 #else 4255 struct stat buf; 4256 if (os::stat(hotspotrc, &buf) == 0) { 4257 needs_hotspotrc_warning = true; 4258 } 4259 #endif 4260 } 4261 4262 if (PrintVMOptions) { 4263 print_options(cur_java_tool_options_args); 4264 print_options(cur_cmd_args); 4265 print_options(cur_java_options_args); 4266 } 4267 4268 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4269 jint result = parse_vm_init_args(cur_java_tool_options_args, 4270 cur_java_options_args, 4271 cur_cmd_args); 4272 4273 if (result != JNI_OK) { 4274 return result; 4275 } 4276 4277 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4278 SharedArchivePath = get_shared_archive_path(); 4279 if (SharedArchivePath == NULL) { 4280 return JNI_ENOMEM; 4281 } 4282 4283 // Set up VerifySharedSpaces 4284 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4285 VerifySharedSpaces = true; 4286 } 4287 4288 // Delay warning until here so that we've had a chance to process 4289 // the -XX:-PrintWarnings flag 4290 if (needs_hotspotrc_warning) { 4291 warning("%s file is present but has been ignored. " 4292 "Run with -XX:Flags=%s to load the file.", 4293 hotspotrc, hotspotrc); 4294 } 4295 4296 if (needs_module_property_warning) { 4297 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4298 " names that are reserved for internal use."); 4299 } 4300 4301 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4302 UNSUPPORTED_OPTION(UseLargePages); 4303 #endif 4304 4305 ArgumentsExt::report_unsupported_options(); 4306 4307 #ifndef PRODUCT 4308 if (TraceBytecodesAt != 0) { 4309 TraceBytecodes = true; 4310 } 4311 if (CountCompiledCalls) { 4312 if (UseCounterDecay) { 4313 warning("UseCounterDecay disabled because CountCalls is set"); 4314 UseCounterDecay = false; 4315 } 4316 } 4317 #endif // PRODUCT 4318 4319 if (ScavengeRootsInCode == 0) { 4320 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4321 warning("Forcing ScavengeRootsInCode non-zero"); 4322 } 4323 ScavengeRootsInCode = 1; 4324 } 4325 4326 if (!handle_deprecated_print_gc_flags()) { 4327 return JNI_EINVAL; 4328 } 4329 4330 // Set object alignment values. 4331 set_object_alignment(); 4332 4333 #if !INCLUDE_CDS 4334 if (DumpSharedSpaces || RequireSharedSpaces) { 4335 jio_fprintf(defaultStream::error_stream(), 4336 "Shared spaces are not supported in this VM\n"); 4337 return JNI_ERR; 4338 } 4339 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4340 warning("Shared spaces are not supported in this VM"); 4341 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4342 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4343 } 4344 no_shared_spaces("CDS Disabled"); 4345 #endif // INCLUDE_CDS 4346 4347 return JNI_OK; 4348 } 4349 4350 jint Arguments::apply_ergo() { 4351 // Set flags based on ergonomics. 4352 set_ergonomics_flags(); 4353 4354 set_shared_spaces_flags(); 4355 4356 // Check the GC selections again. 4357 if (!check_gc_consistency()) { 4358 return JNI_EINVAL; 4359 } 4360 4361 if (TieredCompilation) { 4362 set_tiered_flags(); 4363 } else { 4364 int max_compilation_policy_choice = 1; 4365 #ifdef COMPILER2 4366 max_compilation_policy_choice = 2; 4367 #endif 4368 // Check if the policy is valid. 4369 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4370 vm_exit_during_initialization( 4371 "Incompatible compilation policy selected", NULL); 4372 } 4373 // Scale CompileThreshold 4374 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4375 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4376 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4377 } 4378 } 4379 4380 #ifdef COMPILER2 4381 #ifndef PRODUCT 4382 if (PrintIdealGraphLevel > 0) { 4383 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4384 } 4385 #endif 4386 #endif 4387 4388 // Set heap size based on available physical memory 4389 set_heap_size(); 4390 4391 ArgumentsExt::set_gc_specific_flags(); 4392 4393 // Initialize Metaspace flags and alignments 4394 Metaspace::ergo_initialize(); 4395 4396 // Set bytecode rewriting flags 4397 set_bytecode_flags(); 4398 4399 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4400 jint code = set_aggressive_opts_flags(); 4401 if (code != JNI_OK) { 4402 return code; 4403 } 4404 4405 // Turn off biased locking for locking debug mode flags, 4406 // which are subtly different from each other but neither works with 4407 // biased locking 4408 if (UseHeavyMonitors 4409 #ifdef COMPILER1 4410 || !UseFastLocking 4411 #endif // COMPILER1 4412 #if INCLUDE_JVMCI 4413 || !JVMCIUseFastLocking 4414 #endif 4415 ) { 4416 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4417 // flag set to true on command line; warn the user that they 4418 // can't enable biased locking here 4419 warning("Biased Locking is not supported with locking debug flags" 4420 "; ignoring UseBiasedLocking flag." ); 4421 } 4422 UseBiasedLocking = false; 4423 } 4424 4425 #ifdef CC_INTERP 4426 // Clear flags not supported on zero. 4427 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4428 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4429 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4430 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4431 #endif // CC_INTERP 4432 4433 #ifdef COMPILER2 4434 if (!EliminateLocks) { 4435 EliminateNestedLocks = false; 4436 } 4437 if (!Inline) { 4438 IncrementalInline = false; 4439 } 4440 #ifndef PRODUCT 4441 if (!IncrementalInline) { 4442 AlwaysIncrementalInline = false; 4443 } 4444 #endif 4445 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4446 // nothing to use the profiling, turn if off 4447 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4448 } 4449 #endif 4450 4451 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4452 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4453 DebugNonSafepoints = true; 4454 } 4455 4456 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4457 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4458 } 4459 4460 if (UseOnStackReplacement && !UseLoopCounter) { 4461 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4462 FLAG_SET_DEFAULT(UseLoopCounter, true); 4463 } 4464 4465 #ifndef PRODUCT 4466 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4467 if (use_vm_log()) { 4468 LogVMOutput = true; 4469 } 4470 } 4471 #endif // PRODUCT 4472 4473 if (PrintCommandLineFlags) { 4474 CommandLineFlags::printSetFlags(tty); 4475 } 4476 4477 // Apply CPU specific policy for the BiasedLocking 4478 if (UseBiasedLocking) { 4479 if (!VM_Version::use_biased_locking() && 4480 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4481 UseBiasedLocking = false; 4482 } 4483 } 4484 #ifdef COMPILER2 4485 if (!UseBiasedLocking || EmitSync != 0) { 4486 UseOptoBiasInlining = false; 4487 } 4488 #endif 4489 4490 return JNI_OK; 4491 } 4492 4493 jint Arguments::adjust_after_os() { 4494 if (UseNUMA) { 4495 if (UseParallelGC || UseParallelOldGC) { 4496 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4497 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4498 } 4499 } 4500 // UseNUMAInterleaving is set to ON for all collectors and 4501 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4502 // such as the parallel collector for Linux and Solaris will 4503 // interleave old gen and survivor spaces on top of NUMA 4504 // allocation policy for the eden space. 4505 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4506 // all platforms and ParallelGC on Windows will interleave all 4507 // of the heap spaces across NUMA nodes. 4508 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4509 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4510 } 4511 } 4512 return JNI_OK; 4513 } 4514 4515 int Arguments::PropertyList_count(SystemProperty* pl) { 4516 int count = 0; 4517 while(pl != NULL) { 4518 count++; 4519 pl = pl->next(); 4520 } 4521 return count; 4522 } 4523 4524 // Return the number of readable properties. 4525 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4526 int count = 0; 4527 while(pl != NULL) { 4528 if (pl->is_readable()) { 4529 count++; 4530 } 4531 pl = pl->next(); 4532 } 4533 return count; 4534 } 4535 4536 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4537 assert(key != NULL, "just checking"); 4538 SystemProperty* prop; 4539 for (prop = pl; prop != NULL; prop = prop->next()) { 4540 if (strcmp(key, prop->key()) == 0) return prop->value(); 4541 } 4542 return NULL; 4543 } 4544 4545 // Return the value of the requested property provided that it is a readable property. 4546 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4547 assert(key != NULL, "just checking"); 4548 SystemProperty* prop; 4549 // Return the property value if the keys match and the property is not internal or 4550 // it's the special internal property "jdk.boot.class.path.append". 4551 for (prop = pl; prop != NULL; prop = prop->next()) { 4552 if (strcmp(key, prop->key()) == 0) { 4553 if (!prop->internal()) { 4554 return prop->value(); 4555 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4556 return prop->value(); 4557 } else { 4558 // Property is internal and not jdk.boot.class.path.append so return NULL. 4559 return NULL; 4560 } 4561 } 4562 } 4563 return NULL; 4564 } 4565 4566 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4567 int count = 0; 4568 const char* ret_val = NULL; 4569 4570 while(pl != NULL) { 4571 if(count >= index) { 4572 ret_val = pl->key(); 4573 break; 4574 } 4575 count++; 4576 pl = pl->next(); 4577 } 4578 4579 return ret_val; 4580 } 4581 4582 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4583 int count = 0; 4584 char* ret_val = NULL; 4585 4586 while(pl != NULL) { 4587 if(count >= index) { 4588 ret_val = pl->value(); 4589 break; 4590 } 4591 count++; 4592 pl = pl->next(); 4593 } 4594 4595 return ret_val; 4596 } 4597 4598 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4599 SystemProperty* p = *plist; 4600 if (p == NULL) { 4601 *plist = new_p; 4602 } else { 4603 while (p->next() != NULL) { 4604 p = p->next(); 4605 } 4606 p->set_next(new_p); 4607 } 4608 } 4609 4610 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4611 bool writeable, bool internal) { 4612 if (plist == NULL) 4613 return; 4614 4615 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4616 PropertyList_add(plist, new_p); 4617 } 4618 4619 void Arguments::PropertyList_add(SystemProperty *element) { 4620 PropertyList_add(&_system_properties, element); 4621 } 4622 4623 // This add maintains unique property key in the list. 4624 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4625 PropertyAppendable append, PropertyWriteable writeable, 4626 PropertyInternal internal) { 4627 if (plist == NULL) 4628 return; 4629 4630 // If property key exist then update with new value. 4631 SystemProperty* prop; 4632 for (prop = *plist; prop != NULL; prop = prop->next()) { 4633 if (strcmp(k, prop->key()) == 0) { 4634 if (append == AppendProperty) { 4635 prop->append_value(v); 4636 } else { 4637 prop->set_value(v); 4638 } 4639 return; 4640 } 4641 } 4642 4643 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4644 } 4645 4646 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4647 // Returns true if all of the source pointed by src has been copied over to 4648 // the destination buffer pointed by buf. Otherwise, returns false. 4649 // Notes: 4650 // 1. If the length (buflen) of the destination buffer excluding the 4651 // NULL terminator character is not long enough for holding the expanded 4652 // pid characters, it also returns false instead of returning the partially 4653 // expanded one. 4654 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4655 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4656 char* buf, size_t buflen) { 4657 const char* p = src; 4658 char* b = buf; 4659 const char* src_end = &src[srclen]; 4660 char* buf_end = &buf[buflen - 1]; 4661 4662 while (p < src_end && b < buf_end) { 4663 if (*p == '%') { 4664 switch (*(++p)) { 4665 case '%': // "%%" ==> "%" 4666 *b++ = *p++; 4667 break; 4668 case 'p': { // "%p" ==> current process id 4669 // buf_end points to the character before the last character so 4670 // that we could write '\0' to the end of the buffer. 4671 size_t buf_sz = buf_end - b + 1; 4672 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4673 4674 // if jio_snprintf fails or the buffer is not long enough to hold 4675 // the expanded pid, returns false. 4676 if (ret < 0 || ret >= (int)buf_sz) { 4677 return false; 4678 } else { 4679 b += ret; 4680 assert(*b == '\0', "fail in copy_expand_pid"); 4681 if (p == src_end && b == buf_end + 1) { 4682 // reach the end of the buffer. 4683 return true; 4684 } 4685 } 4686 p++; 4687 break; 4688 } 4689 default : 4690 *b++ = '%'; 4691 } 4692 } else { 4693 *b++ = *p++; 4694 } 4695 } 4696 *b = '\0'; 4697 return (p == src_end); // return false if not all of the source was copied 4698 }