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/jvm.h" 43 #include "prims/jvmtiExport.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/arguments_ext.hpp" 46 #include "runtime/commandLineFlagConstraintList.hpp" 47 #include "runtime/commandLineFlagWriteableList.hpp" 48 #include "runtime/commandLineFlagRangeList.hpp" 49 #include "runtime/globals.hpp" 50 #include "runtime/globals_extension.hpp" 51 #include "runtime/java.hpp" 52 #include "runtime/os.hpp" 53 #include "runtime/vm_version.hpp" 54 #include "services/management.hpp" 55 #include "services/memTracker.hpp" 56 #include "utilities/align.hpp" 57 #include "utilities/defaultStream.hpp" 58 #include "utilities/macros.hpp" 59 #include "utilities/stringUtils.hpp" 60 #if INCLUDE_JVMCI 61 #include "jvmci/jvmciRuntime.hpp" 62 #endif 63 #if INCLUDE_ALL_GCS 64 #include "gc/cms/compactibleFreeListSpace.hpp" 65 #include "gc/g1/g1CollectedHeap.inline.hpp" 66 #include "gc/parallel/parallelScavengeHeap.hpp" 67 #endif // INCLUDE_ALL_GCS 68 69 // Note: This is a special bug reporting site for the JVM 70 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 71 #define DEFAULT_JAVA_LAUNCHER "generic" 72 73 char* Arguments::_jvm_flags_file = NULL; 74 char** Arguments::_jvm_flags_array = NULL; 75 int Arguments::_num_jvm_flags = 0; 76 char** Arguments::_jvm_args_array = NULL; 77 int Arguments::_num_jvm_args = 0; 78 char* Arguments::_java_command = NULL; 79 SystemProperty* Arguments::_system_properties = NULL; 80 const char* Arguments::_gc_log_filename = NULL; 81 size_t Arguments::_conservative_max_heap_alignment = 0; 82 size_t Arguments::_min_heap_size = 0; 83 Arguments::Mode Arguments::_mode = _mixed; 84 bool Arguments::_java_compiler = false; 85 bool Arguments::_xdebug_mode = false; 86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 88 int Arguments::_sun_java_launcher_pid = -1; 89 bool Arguments::_sun_java_launcher_is_altjvm = false; 90 91 // These parameters are reset in method parse_vm_init_args() 92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 94 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 95 bool Arguments::_ClipInlining = ClipInlining; 96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 98 99 char* Arguments::SharedArchivePath = NULL; 100 101 AgentLibraryList Arguments::_libraryList; 102 AgentLibraryList Arguments::_agentList; 103 104 abort_hook_t Arguments::_abort_hook = NULL; 105 exit_hook_t Arguments::_exit_hook = NULL; 106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 107 108 109 SystemProperty *Arguments::_sun_boot_library_path = NULL; 110 SystemProperty *Arguments::_java_library_path = NULL; 111 SystemProperty *Arguments::_java_home = NULL; 112 SystemProperty *Arguments::_java_class_path = NULL; 113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 114 115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 116 PathString *Arguments::_system_boot_class_path = NULL; 117 bool Arguments::_has_jimage = false; 118 119 char* Arguments::_ext_dirs = NULL; 120 121 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 122 // part of the option string. 123 static bool match_option(const JavaVMOption *option, const char* name, 124 const char** tail) { 125 size_t len = strlen(name); 126 if (strncmp(option->optionString, name, len) == 0) { 127 *tail = option->optionString + len; 128 return true; 129 } else { 130 return false; 131 } 132 } 133 134 // Check if 'option' matches 'name'. No "tail" is allowed. 135 static bool match_option(const JavaVMOption *option, const char* name) { 136 const char* tail = NULL; 137 bool result = match_option(option, name, &tail); 138 if (tail != NULL && *tail == '\0') { 139 return result; 140 } else { 141 return false; 142 } 143 } 144 145 // Return true if any of the strings in null-terminated array 'names' matches. 146 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 147 // the option must match exactly. 148 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 149 bool tail_allowed) { 150 for (/* empty */; *names != NULL; ++names) { 151 if (match_option(option, *names, tail)) { 152 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 153 return true; 154 } 155 } 156 } 157 return false; 158 } 159 160 static void logOption(const char* opt) { 161 if (PrintVMOptions) { 162 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 163 } 164 } 165 166 bool needs_module_property_warning = false; 167 168 #define MODULE_PROPERTY_PREFIX "jdk.module." 169 #define MODULE_PROPERTY_PREFIX_LEN 11 170 #define ADDEXPORTS "addexports" 171 #define ADDEXPORTS_LEN 10 172 #define ADDREADS "addreads" 173 #define ADDREADS_LEN 8 174 #define ADDOPENS "addopens" 175 #define ADDOPENS_LEN 8 176 #define PATCH "patch" 177 #define PATCH_LEN 5 178 #define ADDMODS "addmods" 179 #define ADDMODS_LEN 7 180 #define LIMITMODS "limitmods" 181 #define LIMITMODS_LEN 9 182 #define PATH "path" 183 #define PATH_LEN 4 184 #define UPGRADE_PATH "upgrade.path" 185 #define UPGRADE_PATH_LEN 12 186 187 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 188 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 189 return ((strncmp(option, property, len) == 0) && 190 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 191 } 192 193 // Return true if property starts with "jdk.module." and its ensuing chars match 194 // any of the reserved module properties. 195 // property should be passed without the leading "-D". 196 bool Arguments::is_internal_module_property(const char* property) { 197 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 198 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 199 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 200 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 201 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 202 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 203 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 204 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 205 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 206 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 207 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 208 return true; 209 } 210 } 211 return false; 212 } 213 214 // Process java launcher properties. 215 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 216 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 217 // sun.java.launcher.pid is defined. 218 // Must do this before setting up other system properties, 219 // as some of them may depend on launcher type. 220 for (int index = 0; index < args->nOptions; index++) { 221 const JavaVMOption* option = args->options + index; 222 const char* tail; 223 224 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 225 process_java_launcher_argument(tail, option->extraInfo); 226 continue; 227 } 228 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 229 if (strcmp(tail, "true") == 0) { 230 _sun_java_launcher_is_altjvm = true; 231 } 232 continue; 233 } 234 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 235 _sun_java_launcher_pid = atoi(tail); 236 continue; 237 } 238 } 239 } 240 241 // Initialize system properties key and value. 242 void Arguments::init_system_properties() { 243 244 // Set up _system_boot_class_path which is not a property but 245 // relies heavily on argument processing and the jdk.boot.class.path.append 246 // property. It is used to store the underlying system boot class path. 247 _system_boot_class_path = new PathString(NULL); 248 249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 250 "Java Virtual Machine Specification", false)); 251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 253 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 254 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 255 256 // Following are JVMTI agent writable properties. 257 // Properties values are set to NULL and they are 258 // os specific they are initialized in os::init_system_properties_values(). 259 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 260 _java_library_path = new SystemProperty("java.library.path", NULL, true); 261 _java_home = new SystemProperty("java.home", NULL, true); 262 _java_class_path = new SystemProperty("java.class.path", "", true); 263 // jdk.boot.class.path.append is a non-writeable, internal property. 264 // It can only be set by either: 265 // - -Xbootclasspath/a: 266 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 267 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 268 269 // Add to System Property list. 270 PropertyList_add(&_system_properties, _sun_boot_library_path); 271 PropertyList_add(&_system_properties, _java_library_path); 272 PropertyList_add(&_system_properties, _java_home); 273 PropertyList_add(&_system_properties, _java_class_path); 274 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 275 276 // Set OS specific system properties values 277 os::init_system_properties_values(); 278 } 279 280 // Update/Initialize System properties after JDK version number is known 281 void Arguments::init_version_specific_system_properties() { 282 enum { bufsz = 16 }; 283 char buffer[bufsz]; 284 const char* spec_vendor = "Oracle Corporation"; 285 uint32_t spec_version = JDK_Version::current().major_version(); 286 287 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 288 289 PropertyList_add(&_system_properties, 290 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 291 PropertyList_add(&_system_properties, 292 new SystemProperty("java.vm.specification.version", buffer, false)); 293 PropertyList_add(&_system_properties, 294 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 295 } 296 297 /* 298 * -XX argument processing: 299 * 300 * -XX arguments are defined in several places, such as: 301 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 302 * -XX arguments are parsed in parse_argument(). 303 * -XX argument bounds checking is done in check_vm_args_consistency(). 304 * 305 * Over time -XX arguments may change. There are mechanisms to handle common cases: 306 * 307 * ALIASED: An option that is simply another name for another option. This is often 308 * part of the process of deprecating a flag, but not all aliases need 309 * to be deprecated. 310 * 311 * Create an alias for an option by adding the old and new option names to the 312 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 313 * 314 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 315 * support may be removed in the future. Both regular and aliased options may be 316 * deprecated. 317 * 318 * Add a deprecation warning for an option (or alias) by adding an entry in the 319 * "special_jvm_flags" table and setting the "deprecated_in" field. 320 * Often an option "deprecated" in one major release will 321 * be made "obsolete" in the next. In this case the entry should also have its 322 * "obsolete_in" field set. 323 * 324 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 325 * on the command line. A warning is printed to let the user know that option might not 326 * be accepted in the future. 327 * 328 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 329 * table and setting the "obsolete_in" field. 330 * 331 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 332 * to the current JDK version. The system will flatly refuse to admit the existence of 333 * the flag. This allows a flag to die automatically over JDK releases. 334 * 335 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 336 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 337 * - Newly obsolete or expired deprecated options should have their global variable 338 * definitions removed (from globals.hpp, etc) and related implementations removed. 339 * 340 * Recommended approach for removing options: 341 * 342 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 343 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 344 * 345 * To remove internal options (e.g. diagnostic, experimental, develop options), use 346 * a 2-step model adding major release numbers to the obsolete and expire columns. 347 * 348 * To change the name of an option, use the alias table as well as a 2-step 349 * model adding major release numbers to the deprecate and expire columns. 350 * Think twice about aliasing commonly used customer options. 351 * 352 * There are times when it is appropriate to leave a future release number as undefined. 353 * 354 * Tests: Aliases should be tested in VMAliasOptions.java. 355 * Deprecated options should be tested in VMDeprecatedOptions.java. 356 */ 357 358 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 359 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 360 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 361 // the command-line as usual, but will issue a warning. 362 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 363 // the command-line, while issuing a warning and ignoring the flag value. 364 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 365 // existence of the flag. 366 // 367 // MANUAL CLEANUP ON JDK VERSION UPDATES: 368 // This table ensures that the handling of options will update automatically when the JDK 369 // version is incremented, but the source code needs to be cleanup up manually: 370 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 371 // variable should be removed, as well as users of the variable. 372 // - As "deprecated" options age into "obsolete" options, move the entry into the 373 // "Obsolete Flags" section of the table. 374 // - All expired options should be removed from the table. 375 static SpecialFlag const special_jvm_flags[] = { 376 // -------------- Deprecated Flags -------------- 377 // --- Non-alias flags - sorted by obsolete_in then expired_in: 378 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 379 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 380 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() }, 381 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 382 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 383 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 384 385 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 386 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 387 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 388 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 389 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 390 391 // -------------- Obsolete Flags - sorted by expired_in -------------- 392 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 393 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 394 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 395 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 396 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 397 398 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 399 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 400 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 401 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 402 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 403 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 404 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 405 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 406 #endif 407 408 { NULL, JDK_Version(0), JDK_Version(0) } 409 }; 410 411 // Flags that are aliases for other flags. 412 typedef struct { 413 const char* alias_name; 414 const char* real_name; 415 } AliasedFlag; 416 417 static AliasedFlag const aliased_jvm_flags[] = { 418 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 419 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 420 { NULL, NULL} 421 }; 422 423 // NOTE: A compatibility request will be necessary for each alias to be removed. 424 static AliasedLoggingFlag const aliased_logging_flags[] = { 425 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 426 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 427 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 428 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 429 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 430 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 431 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 432 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 433 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 434 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 435 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 436 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 437 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 438 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 439 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 440 }; 441 442 #ifndef PRODUCT 443 // These options are removed in jdk9. Remove this code for jdk10. 444 static AliasedFlag const removed_develop_logging_flags[] = { 445 { "TraceClassInitialization", "-Xlog:class+init" }, 446 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 447 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 448 { "TraceItables", "-Xlog:itables=debug" }, 449 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 450 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 451 { "TraceStartupTime", "-Xlog:startuptime" }, 452 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 453 { "PrintVtables", "-Xlog:vtables=debug" }, 454 { "VerboseVerification", "-Xlog:verification" }, 455 { NULL, NULL } 456 }; 457 #endif //PRODUCT 458 459 // Return true if "v" is less than "other", where "other" may be "undefined". 460 static bool version_less_than(JDK_Version v, JDK_Version other) { 461 assert(!v.is_undefined(), "must be defined"); 462 if (!other.is_undefined() && v.compare(other) >= 0) { 463 return false; 464 } else { 465 return true; 466 } 467 } 468 469 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 470 471 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 472 // Allow extensions to have priority 473 if (lookup_special_flag_ext(flag_name, flag)) { 474 return true; 475 } 476 477 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 478 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 479 flag = special_jvm_flags[i]; 480 return true; 481 } 482 } 483 return false; 484 } 485 486 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 487 assert(version != NULL, "Must provide a version buffer"); 488 SpecialFlag flag; 489 if (lookup_special_flag(flag_name, flag)) { 490 if (!flag.obsolete_in.is_undefined()) { 491 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 492 *version = flag.obsolete_in; 493 return true; 494 } 495 } 496 } 497 return false; 498 } 499 500 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 501 assert(version != NULL, "Must provide a version buffer"); 502 SpecialFlag flag; 503 if (lookup_special_flag(flag_name, flag)) { 504 if (!flag.deprecated_in.is_undefined()) { 505 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 506 version_less_than(JDK_Version::current(), flag.expired_in)) { 507 *version = flag.deprecated_in; 508 return 1; 509 } else { 510 return -1; 511 } 512 } 513 } 514 return 0; 515 } 516 517 #ifndef PRODUCT 518 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 519 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 520 const AliasedFlag& flag = removed_develop_logging_flags[i]; 521 if (strcmp(flag.alias_name, name) == 0) { 522 return flag.real_name; 523 } 524 } 525 return NULL; 526 } 527 #endif // PRODUCT 528 529 const char* Arguments::real_flag_name(const char *flag_name) { 530 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 531 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 532 if (strcmp(flag_status.alias_name, flag_name) == 0) { 533 return flag_status.real_name; 534 } 535 } 536 return flag_name; 537 } 538 539 #ifdef ASSERT 540 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 541 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 542 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 543 return true; 544 } 545 } 546 return false; 547 } 548 549 static bool verify_special_jvm_flags() { 550 bool success = true; 551 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 552 const SpecialFlag& flag = special_jvm_flags[i]; 553 if (lookup_special_flag(flag.name, i)) { 554 warning("Duplicate special flag declaration \"%s\"", flag.name); 555 success = false; 556 } 557 if (flag.deprecated_in.is_undefined() && 558 flag.obsolete_in.is_undefined()) { 559 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 560 success = false; 561 } 562 563 if (!flag.deprecated_in.is_undefined()) { 564 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 565 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 566 success = false; 567 } 568 569 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 570 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 571 success = false; 572 } 573 } 574 575 if (!flag.obsolete_in.is_undefined()) { 576 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 577 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 578 success = false; 579 } 580 581 // if flag has become obsolete it should not have a "globals" flag defined anymore. 582 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 583 if (Flag::find_flag(flag.name) != NULL) { 584 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 585 success = false; 586 } 587 } 588 } 589 590 if (!flag.expired_in.is_undefined()) { 591 // if flag has become expired it should not have a "globals" flag defined anymore. 592 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 593 if (Flag::find_flag(flag.name) != NULL) { 594 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 595 success = false; 596 } 597 } 598 } 599 600 } 601 return success; 602 } 603 #endif 604 605 // Parses a size specification string. 606 bool Arguments::atojulong(const char *s, julong* result) { 607 julong n = 0; 608 609 // First char must be a digit. Don't allow negative numbers or leading spaces. 610 if (!isdigit(*s)) { 611 return false; 612 } 613 614 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 615 char* remainder; 616 errno = 0; 617 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 618 if (errno != 0) { 619 return false; 620 } 621 622 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 623 if (remainder == s || strlen(remainder) > 1) { 624 return false; 625 } 626 627 switch (*remainder) { 628 case 'T': case 't': 629 *result = n * G * K; 630 // Check for overflow. 631 if (*result/((julong)G * K) != n) return false; 632 return true; 633 case 'G': case 'g': 634 *result = n * G; 635 if (*result/G != n) return false; 636 return true; 637 case 'M': case 'm': 638 *result = n * M; 639 if (*result/M != n) return false; 640 return true; 641 case 'K': case 'k': 642 *result = n * K; 643 if (*result/K != n) return false; 644 return true; 645 case '\0': 646 *result = n; 647 return true; 648 default: 649 return false; 650 } 651 } 652 653 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 654 if (size < min_size) return arg_too_small; 655 if (size > max_size) return arg_too_big; 656 return arg_in_range; 657 } 658 659 // Describe an argument out of range error 660 void Arguments::describe_range_error(ArgsRange errcode) { 661 switch(errcode) { 662 case arg_too_big: 663 jio_fprintf(defaultStream::error_stream(), 664 "The specified size exceeds the maximum " 665 "representable size.\n"); 666 break; 667 case arg_too_small: 668 case arg_unreadable: 669 case arg_in_range: 670 // do nothing for now 671 break; 672 default: 673 ShouldNotReachHere(); 674 } 675 } 676 677 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 678 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 679 return true; 680 } else { 681 return false; 682 } 683 } 684 685 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 686 char* end; 687 errno = 0; 688 double v = strtod(value, &end); 689 if ((errno != 0) || (*end != 0)) { 690 return false; 691 } 692 693 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 694 return true; 695 } 696 return false; 697 } 698 699 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 700 julong v; 701 int int_v; 702 intx intx_v; 703 bool is_neg = false; 704 Flag* result = Flag::find_flag(name, strlen(name)); 705 706 if (result == NULL) { 707 return false; 708 } 709 710 // Check the sign first since atojulong() parses only unsigned values. 711 if (*value == '-') { 712 if (!result->is_intx() && !result->is_int()) { 713 return false; 714 } 715 value++; 716 is_neg = true; 717 } 718 if (!Arguments::atojulong(value, &v)) { 719 return false; 720 } 721 if (result->is_int()) { 722 int_v = (int) v; 723 if (is_neg) { 724 int_v = -int_v; 725 } 726 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 727 } else if (result->is_uint()) { 728 uint uint_v = (uint) v; 729 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 730 } else if (result->is_intx()) { 731 intx_v = (intx) v; 732 if (is_neg) { 733 intx_v = -intx_v; 734 } 735 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 736 } else if (result->is_uintx()) { 737 uintx uintx_v = (uintx) v; 738 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 739 } else if (result->is_uint64_t()) { 740 uint64_t uint64_t_v = (uint64_t) v; 741 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 742 } else if (result->is_size_t()) { 743 size_t size_t_v = (size_t) v; 744 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 745 } else if (result->is_double()) { 746 double double_v = (double) v; 747 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS; 748 } else { 749 return false; 750 } 751 } 752 753 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 754 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 755 // Contract: CommandLineFlags always returns a pointer that needs freeing. 756 FREE_C_HEAP_ARRAY(char, value); 757 return true; 758 } 759 760 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 761 const char* old_value = ""; 762 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 763 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 764 size_t new_len = strlen(new_value); 765 const char* value; 766 char* free_this_too = NULL; 767 if (old_len == 0) { 768 value = new_value; 769 } else if (new_len == 0) { 770 value = old_value; 771 } else { 772 size_t length = old_len + 1 + new_len + 1; 773 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 774 // each new setting adds another LINE to the switch: 775 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 776 value = buf; 777 free_this_too = buf; 778 } 779 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 780 // CommandLineFlags always returns a pointer that needs freeing. 781 FREE_C_HEAP_ARRAY(char, value); 782 if (free_this_too != NULL) { 783 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 784 FREE_C_HEAP_ARRAY(char, free_this_too); 785 } 786 return true; 787 } 788 789 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 790 const char* real_name = real_flag_name(arg); 791 JDK_Version since = JDK_Version(); 792 switch (is_deprecated_flag(arg, &since)) { 793 case -1: 794 return NULL; // obsolete or expired, don't process normally 795 case 0: 796 return real_name; 797 case 1: { 798 if (warn) { 799 char version[256]; 800 since.to_string(version, sizeof(version)); 801 if (real_name != arg) { 802 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 803 arg, version, real_name); 804 } else { 805 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 806 arg, version); 807 } 808 } 809 return real_name; 810 } 811 } 812 ShouldNotReachHere(); 813 return NULL; 814 } 815 816 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 817 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 818 // Set tagset string buffer at max size of 256, large enough for any alias tagset 819 const int max_tagset_size = 256; 820 int max_tagset_len = max_tagset_size - 1; 821 char tagset_buffer[max_tagset_size]; 822 tagset_buffer[0] = '\0'; 823 824 // Write tag-set for aliased logging option, in string list form 825 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 826 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 827 if (i > 0) { 828 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 829 } 830 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 831 } 832 if (!alf.exactMatch) { 833 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 834 } 835 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 836 (on) ? "+" : "-", 837 name, 838 tagset_buffer, 839 (on) ? LogLevel::name(alf.level) : "off"); 840 } 841 842 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 843 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 844 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 845 if (strcmp(alf.alias_name, name) == 0) { 846 log_deprecated_flag(name, on, alf); 847 return alf; 848 } 849 } 850 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 851 return a; 852 } 853 854 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 855 856 // range of acceptable characters spelled out for portability reasons 857 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 858 #define BUFLEN 255 859 char name[BUFLEN+1]; 860 char dummy; 861 const char* real_name; 862 bool warn_if_deprecated = true; 863 864 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 865 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 866 if (alf.alias_name != NULL){ 867 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 868 return true; 869 } 870 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 871 if (real_name == NULL) { 872 return false; 873 } 874 return set_bool_flag(real_name, false, origin); 875 } 876 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 877 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 878 if (alf.alias_name != NULL){ 879 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 880 return true; 881 } 882 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 883 if (real_name == NULL) { 884 return false; 885 } 886 return set_bool_flag(real_name, true, origin); 887 } 888 889 char punct; 890 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 891 const char* value = strchr(arg, '=') + 1; 892 Flag* flag; 893 894 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 895 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 896 if (alf.alias_name != NULL) { 897 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 898 return true; 899 } 900 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 901 if (real_name == NULL) { 902 return false; 903 } 904 flag = Flag::find_flag(real_name); 905 if (flag != NULL && flag->is_ccstr()) { 906 if (flag->ccstr_accumulates()) { 907 return append_to_string_flag(real_name, value, origin); 908 } else { 909 if (value[0] == '\0') { 910 value = NULL; 911 } 912 return set_string_flag(real_name, value, origin); 913 } 914 } else { 915 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 916 } 917 } 918 919 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 920 const char* value = strchr(arg, '=') + 1; 921 // -XX:Foo:=xxx will reset the string flag to the given value. 922 if (value[0] == '\0') { 923 value = NULL; 924 } 925 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 926 if (real_name == NULL) { 927 return false; 928 } 929 return set_string_flag(real_name, value, origin); 930 } 931 932 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 933 #define SIGNED_NUMBER_RANGE "[-0123456789]" 934 #define NUMBER_RANGE "[0123456789eE+-]" 935 char value[BUFLEN + 1]; 936 char value2[BUFLEN + 1]; 937 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 938 // Looks like a floating-point number -- try again with more lenient format string 939 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 940 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 941 if (real_name == NULL) { 942 return false; 943 } 944 return set_fp_numeric_flag(real_name, value, origin); 945 } 946 } 947 948 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 949 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 950 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 951 if (real_name == NULL) { 952 return false; 953 } 954 return set_numeric_flag(real_name, value, origin); 955 } 956 957 return false; 958 } 959 960 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 961 assert(bldarray != NULL, "illegal argument"); 962 963 if (arg == NULL) { 964 return; 965 } 966 967 int new_count = *count + 1; 968 969 // expand the array and add arg to the last element 970 if (*bldarray == NULL) { 971 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 972 } else { 973 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 974 } 975 (*bldarray)[*count] = os::strdup_check_oom(arg); 976 *count = new_count; 977 } 978 979 void Arguments::build_jvm_args(const char* arg) { 980 add_string(&_jvm_args_array, &_num_jvm_args, arg); 981 } 982 983 void Arguments::build_jvm_flags(const char* arg) { 984 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 985 } 986 987 // utility function to return a string that concatenates all 988 // strings in a given char** array 989 const char* Arguments::build_resource_string(char** args, int count) { 990 if (args == NULL || count == 0) { 991 return NULL; 992 } 993 size_t length = 0; 994 for (int i = 0; i < count; i++) { 995 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 996 } 997 char* s = NEW_RESOURCE_ARRAY(char, length); 998 char* dst = s; 999 for (int j = 0; j < count; j++) { 1000 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1001 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1002 dst += offset; 1003 length -= offset; 1004 } 1005 return (const char*) s; 1006 } 1007 1008 void Arguments::print_on(outputStream* st) { 1009 st->print_cr("VM Arguments:"); 1010 if (num_jvm_flags() > 0) { 1011 st->print("jvm_flags: "); print_jvm_flags_on(st); 1012 st->cr(); 1013 } 1014 if (num_jvm_args() > 0) { 1015 st->print("jvm_args: "); print_jvm_args_on(st); 1016 st->cr(); 1017 } 1018 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1019 if (_java_class_path != NULL) { 1020 char* path = _java_class_path->value(); 1021 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1022 } 1023 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1024 } 1025 1026 void Arguments::print_summary_on(outputStream* st) { 1027 // Print the command line. Environment variables that are helpful for 1028 // reproducing the problem are written later in the hs_err file. 1029 // flags are from setting file 1030 if (num_jvm_flags() > 0) { 1031 st->print_raw("Settings File: "); 1032 print_jvm_flags_on(st); 1033 st->cr(); 1034 } 1035 // args are the command line and environment variable arguments. 1036 st->print_raw("Command Line: "); 1037 if (num_jvm_args() > 0) { 1038 print_jvm_args_on(st); 1039 } 1040 // this is the classfile and any arguments to the java program 1041 if (java_command() != NULL) { 1042 st->print("%s", java_command()); 1043 } 1044 st->cr(); 1045 } 1046 1047 void Arguments::print_jvm_flags_on(outputStream* st) { 1048 if (_num_jvm_flags > 0) { 1049 for (int i=0; i < _num_jvm_flags; i++) { 1050 st->print("%s ", _jvm_flags_array[i]); 1051 } 1052 } 1053 } 1054 1055 void Arguments::print_jvm_args_on(outputStream* st) { 1056 if (_num_jvm_args > 0) { 1057 for (int i=0; i < _num_jvm_args; i++) { 1058 st->print("%s ", _jvm_args_array[i]); 1059 } 1060 } 1061 } 1062 1063 bool Arguments::process_argument(const char* arg, 1064 jboolean ignore_unrecognized, 1065 Flag::Flags origin) { 1066 JDK_Version since = JDK_Version(); 1067 1068 if (parse_argument(arg, origin)) { 1069 return true; 1070 } 1071 1072 // Determine if the flag has '+', '-', or '=' characters. 1073 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1074 const char* const argname = has_plus_minus ? arg + 1 : arg; 1075 1076 size_t arg_len; 1077 const char* equal_sign = strchr(argname, '='); 1078 if (equal_sign == NULL) { 1079 arg_len = strlen(argname); 1080 } else { 1081 arg_len = equal_sign - argname; 1082 } 1083 1084 // Only make the obsolete check for valid arguments. 1085 if (arg_len <= BUFLEN) { 1086 // Construct a string which consists only of the argument name without '+', '-', or '='. 1087 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1088 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1089 if (is_obsolete_flag(stripped_argname, &since)) { 1090 char version[256]; 1091 since.to_string(version, sizeof(version)); 1092 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1093 return true; 1094 } 1095 #ifndef PRODUCT 1096 else { 1097 const char* replacement; 1098 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1099 log_warning(arguments)("%s has been removed. Please use %s instead.", 1100 stripped_argname, 1101 replacement); 1102 return false; 1103 } 1104 } 1105 #endif //PRODUCT 1106 } 1107 1108 // For locked flags, report a custom error message if available. 1109 // Otherwise, report the standard unrecognized VM option. 1110 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1111 if (found_flag != NULL) { 1112 char locked_message_buf[BUFLEN]; 1113 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1114 if (strlen(locked_message_buf) == 0) { 1115 if (found_flag->is_bool() && !has_plus_minus) { 1116 jio_fprintf(defaultStream::error_stream(), 1117 "Missing +/- setting for VM option '%s'\n", argname); 1118 } else if (!found_flag->is_bool() && has_plus_minus) { 1119 jio_fprintf(defaultStream::error_stream(), 1120 "Unexpected +/- setting in VM option '%s'\n", argname); 1121 } else { 1122 jio_fprintf(defaultStream::error_stream(), 1123 "Improperly specified VM option '%s'\n", argname); 1124 } 1125 } else { 1126 #ifdef PRODUCT 1127 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1128 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1129 if (ignore_unrecognized && mismatched) { 1130 return true; 1131 } 1132 #endif 1133 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1134 } 1135 } else { 1136 if (ignore_unrecognized) { 1137 return true; 1138 } 1139 jio_fprintf(defaultStream::error_stream(), 1140 "Unrecognized VM option '%s'\n", argname); 1141 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1142 if (fuzzy_matched != NULL) { 1143 jio_fprintf(defaultStream::error_stream(), 1144 "Did you mean '%s%s%s'? ", 1145 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1146 fuzzy_matched->_name, 1147 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1148 } 1149 } 1150 1151 // allow for commandline "commenting out" options like -XX:#+Verbose 1152 return arg[0] == '#'; 1153 } 1154 1155 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1156 FILE* stream = fopen(file_name, "rb"); 1157 if (stream == NULL) { 1158 if (should_exist) { 1159 jio_fprintf(defaultStream::error_stream(), 1160 "Could not open settings file %s\n", file_name); 1161 return false; 1162 } else { 1163 return true; 1164 } 1165 } 1166 1167 char token[1024]; 1168 int pos = 0; 1169 1170 bool in_white_space = true; 1171 bool in_comment = false; 1172 bool in_quote = false; 1173 char quote_c = 0; 1174 bool result = true; 1175 1176 int c = getc(stream); 1177 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1178 if (in_white_space) { 1179 if (in_comment) { 1180 if (c == '\n') in_comment = false; 1181 } else { 1182 if (c == '#') in_comment = true; 1183 else if (!isspace(c)) { 1184 in_white_space = false; 1185 token[pos++] = c; 1186 } 1187 } 1188 } else { 1189 if (c == '\n' || (!in_quote && isspace(c))) { 1190 // token ends at newline, or at unquoted whitespace 1191 // this allows a way to include spaces in string-valued options 1192 token[pos] = '\0'; 1193 logOption(token); 1194 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1195 build_jvm_flags(token); 1196 pos = 0; 1197 in_white_space = true; 1198 in_quote = false; 1199 } else if (!in_quote && (c == '\'' || c == '"')) { 1200 in_quote = true; 1201 quote_c = c; 1202 } else if (in_quote && (c == quote_c)) { 1203 in_quote = false; 1204 } else { 1205 token[pos++] = c; 1206 } 1207 } 1208 c = getc(stream); 1209 } 1210 if (pos > 0) { 1211 token[pos] = '\0'; 1212 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1213 build_jvm_flags(token); 1214 } 1215 fclose(stream); 1216 return result; 1217 } 1218 1219 //============================================================================================================= 1220 // Parsing of properties (-D) 1221 1222 const char* Arguments::get_property(const char* key) { 1223 return PropertyList_get_value(system_properties(), key); 1224 } 1225 1226 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1227 const char* eq = strchr(prop, '='); 1228 const char* key; 1229 const char* value = ""; 1230 1231 if (eq == NULL) { 1232 // property doesn't have a value, thus use passed string 1233 key = prop; 1234 } else { 1235 // property have a value, thus extract it and save to the 1236 // allocated string 1237 size_t key_len = eq - prop; 1238 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1239 1240 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1241 key = tmp_key; 1242 1243 value = &prop[key_len + 1]; 1244 } 1245 1246 if (strcmp(key, "java.compiler") == 0) { 1247 process_java_compiler_argument(value); 1248 // Record value in Arguments, but let it get passed to Java. 1249 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1250 strcmp(key, "sun.java.launcher.pid") == 0) { 1251 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1252 // private and are processed in process_sun_java_launcher_properties(); 1253 // the sun.java.launcher property is passed on to the java application 1254 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1255 // append is true, writable is true, internal is false 1256 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1257 WriteableProperty, ExternalProperty); 1258 } else { 1259 if (strcmp(key, "sun.java.command") == 0) { 1260 char *old_java_command = _java_command; 1261 _java_command = os::strdup_check_oom(value, mtArguments); 1262 if (old_java_command != NULL) { 1263 os::free(old_java_command); 1264 } 1265 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1266 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1267 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1268 // its value without going through the property list or making a Java call. 1269 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1270 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1271 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1272 os::free((void *)old_java_vendor_url_bug); 1273 } 1274 } 1275 1276 // Create new property and add at the end of the list 1277 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1278 } 1279 1280 if (key != prop) { 1281 // SystemProperty copy passed value, thus free previously allocated 1282 // memory 1283 FreeHeap((void *)key); 1284 } 1285 1286 return true; 1287 } 1288 1289 #if INCLUDE_CDS 1290 void Arguments::check_unsupported_dumping_properties() { 1291 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1292 const char* unsupported_properties[] = { "jdk.module.main", 1293 "jdk.module.limitmods", 1294 "jdk.module.path", 1295 "jdk.module.upgrade.path", 1296 "jdk.module.patch.0" }; 1297 const char* unsupported_options[] = { "-m", // cannot use at dump time 1298 "--limit-modules", // ignored at dump time 1299 "--module-path", // ignored at dump time 1300 "--upgrade-module-path", // ignored at dump time 1301 "--patch-module" // ignored at dump time 1302 }; 1303 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1304 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1305 // vm will exit with an error message. Otherwise, it will print an informational message if 1306 // -Xlog:cds is enabled. 1307 uint info_idx = 1; 1308 SystemProperty* sp = system_properties(); 1309 while (sp != NULL) { 1310 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1311 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1312 if (i < info_idx) { 1313 vm_exit_during_initialization( 1314 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1315 } else { 1316 log_info(cds)("Info: the %s option is ignored when dumping the shared archive", 1317 unsupported_options[i]); 1318 } 1319 } 1320 } 1321 sp = sp->next(); 1322 } 1323 1324 // Check for an exploded module build in use with -Xshare:dump. 1325 if (!has_jimage()) { 1326 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1327 } 1328 } 1329 #endif 1330 1331 //=========================================================================================================== 1332 // Setting int/mixed/comp mode flags 1333 1334 void Arguments::set_mode_flags(Mode mode) { 1335 // Set up default values for all flags. 1336 // If you add a flag to any of the branches below, 1337 // add a default value for it here. 1338 set_java_compiler(false); 1339 _mode = mode; 1340 1341 // Ensure Agent_OnLoad has the correct initial values. 1342 // This may not be the final mode; mode may change later in onload phase. 1343 PropertyList_unique_add(&_system_properties, "java.vm.info", 1344 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1345 1346 UseInterpreter = true; 1347 UseCompiler = true; 1348 UseLoopCounter = true; 1349 1350 // Default values may be platform/compiler dependent - 1351 // use the saved values 1352 ClipInlining = Arguments::_ClipInlining; 1353 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1354 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1355 BackgroundCompilation = Arguments::_BackgroundCompilation; 1356 if (TieredCompilation) { 1357 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1358 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1359 } 1360 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1361 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1362 } 1363 } 1364 1365 // Change from defaults based on mode 1366 switch (mode) { 1367 default: 1368 ShouldNotReachHere(); 1369 break; 1370 case _int: 1371 UseCompiler = false; 1372 UseLoopCounter = false; 1373 AlwaysCompileLoopMethods = false; 1374 UseOnStackReplacement = false; 1375 break; 1376 case _mixed: 1377 // same as default 1378 break; 1379 case _comp: 1380 UseInterpreter = false; 1381 BackgroundCompilation = false; 1382 ClipInlining = false; 1383 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1384 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1385 // compile a level 4 (C2) and then continue executing it. 1386 if (TieredCompilation) { 1387 Tier3InvokeNotifyFreqLog = 0; 1388 Tier4InvocationThreshold = 0; 1389 } 1390 break; 1391 } 1392 } 1393 1394 // Conflict: required to use shared spaces (-Xshare:on), but 1395 // incompatible command line options were chosen. 1396 static void no_shared_spaces(const char* message) { 1397 if (RequireSharedSpaces) { 1398 jio_fprintf(defaultStream::error_stream(), 1399 "Class data sharing is inconsistent with other specified options.\n"); 1400 vm_exit_during_initialization("Unable to use shared archive.", message); 1401 } else { 1402 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1403 } 1404 } 1405 1406 // Returns threshold scaled with the value of scale. 1407 // If scale < 0.0, threshold is returned without scaling. 1408 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1409 if (scale == 1.0 || scale < 0.0) { 1410 return threshold; 1411 } else { 1412 return (intx)(threshold * scale); 1413 } 1414 } 1415 1416 // Returns freq_log scaled with the value of scale. 1417 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1418 // If scale < 0.0, freq_log is returned without scaling. 1419 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1420 // Check if scaling is necessary or if negative value was specified. 1421 if (scale == 1.0 || scale < 0.0) { 1422 return freq_log; 1423 } 1424 // Check values to avoid calculating log2 of 0. 1425 if (scale == 0.0 || freq_log == 0) { 1426 return 0; 1427 } 1428 // Determine the maximum notification frequency value currently supported. 1429 // The largest mask value that the interpreter/C1 can handle is 1430 // of length InvocationCounter::number_of_count_bits. Mask values are always 1431 // one bit shorter then the value of the notification frequency. Set 1432 // max_freq_bits accordingly. 1433 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1434 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1435 if (scaled_freq == 0) { 1436 // Return 0 right away to avoid calculating log2 of 0. 1437 return 0; 1438 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1439 return max_freq_bits; 1440 } else { 1441 return log2_intptr(scaled_freq); 1442 } 1443 } 1444 1445 void Arguments::set_tiered_flags() { 1446 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1447 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1448 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1449 } 1450 if (CompilationPolicyChoice < 2) { 1451 vm_exit_during_initialization( 1452 "Incompatible compilation policy selected", NULL); 1453 } 1454 // Increase the code cache size - tiered compiles a lot more. 1455 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1456 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1457 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1458 } 1459 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1460 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1461 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1462 } 1463 if (!UseInterpreter) { // -Xcomp 1464 Tier3InvokeNotifyFreqLog = 0; 1465 Tier4InvocationThreshold = 0; 1466 } 1467 1468 if (CompileThresholdScaling < 0) { 1469 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1470 } 1471 1472 // Scale tiered compilation thresholds. 1473 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1474 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1475 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1476 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1477 1478 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1479 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1480 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1481 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1482 1483 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1484 // once these thresholds become supported. 1485 1486 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1487 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1488 1489 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1490 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1491 1492 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1493 1494 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1495 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1496 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1497 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1498 } 1499 } 1500 1501 #if INCLUDE_ALL_GCS 1502 static void disable_adaptive_size_policy(const char* collector_name) { 1503 if (UseAdaptiveSizePolicy) { 1504 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1505 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1506 collector_name); 1507 } 1508 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1509 } 1510 } 1511 1512 void Arguments::set_parnew_gc_flags() { 1513 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1514 "control point invariant"); 1515 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1516 1517 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1518 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1519 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1520 } else if (ParallelGCThreads == 0) { 1521 jio_fprintf(defaultStream::error_stream(), 1522 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1523 vm_exit(1); 1524 } 1525 1526 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1527 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1528 // we set them to 1024 and 1024. 1529 // See CR 6362902. 1530 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1531 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1532 } 1533 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1534 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1535 } 1536 1537 // When using compressed oops, we use local overflow stacks, 1538 // rather than using a global overflow list chained through 1539 // the klass word of the object's pre-image. 1540 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1541 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1542 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1543 } 1544 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1545 } 1546 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1547 } 1548 1549 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1550 // sparc/solaris for certain applications, but would gain from 1551 // further optimization and tuning efforts, and would almost 1552 // certainly gain from analysis of platform and environment. 1553 void Arguments::set_cms_and_parnew_gc_flags() { 1554 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1555 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1556 1557 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1558 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1559 1560 set_parnew_gc_flags(); 1561 1562 size_t max_heap = align_down(MaxHeapSize, 1563 CardTableRS::ct_max_alignment_constraint()); 1564 1565 // Now make adjustments for CMS 1566 intx tenuring_default = (intx)6; 1567 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1568 1569 // Preferred young gen size for "short" pauses: 1570 // upper bound depends on # of threads and NewRatio. 1571 const size_t preferred_max_new_size_unaligned = 1572 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1573 size_t preferred_max_new_size = 1574 align_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1575 1576 // Unless explicitly requested otherwise, size young gen 1577 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1578 1579 // If either MaxNewSize or NewRatio is set on the command line, 1580 // assume the user is trying to set the size of the young gen. 1581 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1582 1583 // Set MaxNewSize to our calculated preferred_max_new_size unless 1584 // NewSize was set on the command line and it is larger than 1585 // preferred_max_new_size. 1586 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1587 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1588 } else { 1589 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1590 } 1591 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1592 1593 // Code along this path potentially sets NewSize and OldSize 1594 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1595 min_heap_size(), InitialHeapSize, max_heap); 1596 size_t min_new = preferred_max_new_size; 1597 if (FLAG_IS_CMDLINE(NewSize)) { 1598 min_new = NewSize; 1599 } 1600 if (max_heap > min_new && min_heap_size() > min_new) { 1601 // Unless explicitly requested otherwise, make young gen 1602 // at least min_new, and at most preferred_max_new_size. 1603 if (FLAG_IS_DEFAULT(NewSize)) { 1604 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1605 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1606 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1607 } 1608 // Unless explicitly requested otherwise, size old gen 1609 // so it's NewRatio x of NewSize. 1610 if (FLAG_IS_DEFAULT(OldSize)) { 1611 if (max_heap > NewSize) { 1612 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1613 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1614 } 1615 } 1616 } 1617 } 1618 // Unless explicitly requested otherwise, definitely 1619 // promote all objects surviving "tenuring_default" scavenges. 1620 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1621 FLAG_IS_DEFAULT(SurvivorRatio)) { 1622 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1623 } 1624 // If we decided above (or user explicitly requested) 1625 // `promote all' (via MaxTenuringThreshold := 0), 1626 // prefer minuscule survivor spaces so as not to waste 1627 // space for (non-existent) survivors 1628 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1629 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1630 } 1631 1632 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1633 // but rather the number of free blocks of a given size that are used when 1634 // replenishing the local per-worker free list caches. 1635 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1636 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1637 // OldPLAB sizing manually turned off: Use a larger default setting, 1638 // unless it was manually specified. This is because a too-low value 1639 // will slow down scavenges. 1640 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1641 } else { 1642 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1643 } 1644 } 1645 1646 // If either of the static initialization defaults have changed, note this 1647 // modification. 1648 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1649 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1650 } 1651 1652 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1653 } 1654 #endif // INCLUDE_ALL_GCS 1655 1656 void set_object_alignment() { 1657 // Object alignment. 1658 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1659 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1660 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1661 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1662 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1663 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1664 1665 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1666 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1667 1668 // Oop encoding heap max 1669 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1670 1671 if (SurvivorAlignmentInBytes == 0) { 1672 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1673 } 1674 1675 #if INCLUDE_ALL_GCS 1676 // Set CMS global values 1677 CompactibleFreeListSpace::set_cms_values(); 1678 #endif // INCLUDE_ALL_GCS 1679 } 1680 1681 size_t Arguments::max_heap_for_compressed_oops() { 1682 // Avoid sign flip. 1683 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1684 // We need to fit both the NULL page and the heap into the memory budget, while 1685 // keeping alignment constraints of the heap. To guarantee the latter, as the 1686 // NULL page is located before the heap, we pad the NULL page to the conservative 1687 // maximum alignment that the GC may ever impose upon the heap. 1688 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1689 _conservative_max_heap_alignment); 1690 1691 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1692 NOT_LP64(ShouldNotReachHere(); return 0); 1693 } 1694 1695 void Arguments::set_use_compressed_oops() { 1696 #ifndef ZERO 1697 #ifdef _LP64 1698 // MaxHeapSize is not set up properly at this point, but 1699 // the only value that can override MaxHeapSize if we are 1700 // to use UseCompressedOops is InitialHeapSize. 1701 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1702 1703 if (max_heap_size <= max_heap_for_compressed_oops()) { 1704 #if !defined(COMPILER1) || defined(TIERED) 1705 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1706 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1707 } 1708 #endif 1709 } else { 1710 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1711 warning("Max heap size too large for Compressed Oops"); 1712 FLAG_SET_DEFAULT(UseCompressedOops, false); 1713 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1714 } 1715 } 1716 #endif // _LP64 1717 #endif // ZERO 1718 } 1719 1720 1721 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1722 // set_use_compressed_oops(). 1723 void Arguments::set_use_compressed_klass_ptrs() { 1724 #ifndef ZERO 1725 #ifdef _LP64 1726 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1727 if (!UseCompressedOops) { 1728 if (UseCompressedClassPointers) { 1729 warning("UseCompressedClassPointers requires UseCompressedOops"); 1730 } 1731 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1732 } else { 1733 // Turn on UseCompressedClassPointers too 1734 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1735 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1736 } 1737 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1738 if (UseCompressedClassPointers) { 1739 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1740 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1741 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1742 } 1743 } 1744 } 1745 #endif // _LP64 1746 #endif // !ZERO 1747 } 1748 1749 void Arguments::set_conservative_max_heap_alignment() { 1750 // The conservative maximum required alignment for the heap is the maximum of 1751 // the alignments imposed by several sources: any requirements from the heap 1752 // itself, the collector policy and the maximum page size we may run the VM 1753 // with. 1754 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1755 #if INCLUDE_ALL_GCS 1756 if (UseParallelGC) { 1757 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1758 } else if (UseG1GC) { 1759 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1760 } 1761 #endif // INCLUDE_ALL_GCS 1762 _conservative_max_heap_alignment = MAX4(heap_alignment, 1763 (size_t)os::vm_allocation_granularity(), 1764 os::max_page_size(), 1765 CollectorPolicy::compute_heap_alignment()); 1766 } 1767 1768 bool Arguments::gc_selected() { 1769 #if INCLUDE_ALL_GCS 1770 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1771 #else 1772 return UseSerialGC; 1773 #endif // INCLUDE_ALL_GCS 1774 } 1775 1776 #ifdef TIERED 1777 bool Arguments::compilation_mode_selected() { 1778 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1779 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1780 1781 } 1782 1783 void Arguments::select_compilation_mode_ergonomically() { 1784 #if defined(_WINDOWS) && !defined(_LP64) 1785 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1786 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1787 } 1788 #endif 1789 if (NeverActAsServerClassMachine) { 1790 set_client_compilation_mode(); 1791 } 1792 } 1793 #endif //TIERED 1794 1795 void Arguments::select_gc_ergonomically() { 1796 #if INCLUDE_ALL_GCS 1797 if (os::is_server_class_machine()) { 1798 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1799 } else { 1800 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1801 } 1802 #else 1803 UNSUPPORTED_OPTION(UseG1GC); 1804 UNSUPPORTED_OPTION(UseParallelGC); 1805 UNSUPPORTED_OPTION(UseParallelOldGC); 1806 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1807 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1808 #endif // INCLUDE_ALL_GCS 1809 } 1810 1811 void Arguments::select_gc() { 1812 if (!gc_selected()) { 1813 select_gc_ergonomically(); 1814 if (!gc_selected()) { 1815 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1816 } 1817 } 1818 } 1819 1820 #if INCLUDE_JVMCI 1821 void Arguments::set_jvmci_specific_flags() { 1822 if (UseJVMCICompiler) { 1823 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1824 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1825 } 1826 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1827 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1828 } 1829 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1830 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1831 } 1832 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1833 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1834 } 1835 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1836 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1837 } 1838 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1839 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1840 } 1841 if (TieredStopAtLevel != CompLevel_full_optimization) { 1842 // Currently JVMCI compiler can only work at the full optimization level 1843 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1844 TieredStopAtLevel = CompLevel_full_optimization; 1845 } 1846 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1847 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1848 } 1849 } 1850 } 1851 #endif 1852 1853 void Arguments::set_ergonomics_flags() { 1854 #ifdef TIERED 1855 if (!compilation_mode_selected()) { 1856 select_compilation_mode_ergonomically(); 1857 } 1858 #endif 1859 select_gc(); 1860 1861 #if defined(COMPILER2) || INCLUDE_JVMCI 1862 // Shared spaces work fine with other GCs but causes bytecode rewriting 1863 // to be disabled, which hurts interpreter performance and decreases 1864 // server performance. When -server is specified, keep the default off 1865 // unless it is asked for. Future work: either add bytecode rewriting 1866 // at link time, or rewrite bytecodes in non-shared methods. 1867 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1868 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1869 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1870 } 1871 #endif 1872 1873 set_conservative_max_heap_alignment(); 1874 1875 #ifndef ZERO 1876 #ifdef _LP64 1877 set_use_compressed_oops(); 1878 1879 // set_use_compressed_klass_ptrs() must be called after calling 1880 // set_use_compressed_oops(). 1881 set_use_compressed_klass_ptrs(); 1882 1883 // Also checks that certain machines are slower with compressed oops 1884 // in vm_version initialization code. 1885 #endif // _LP64 1886 #endif // !ZERO 1887 1888 } 1889 1890 void Arguments::set_parallel_gc_flags() { 1891 assert(UseParallelGC || UseParallelOldGC, "Error"); 1892 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1893 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1894 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1895 } 1896 FLAG_SET_DEFAULT(UseParallelGC, true); 1897 1898 // If no heap maximum was requested explicitly, use some reasonable fraction 1899 // of the physical memory, up to a maximum of 1GB. 1900 FLAG_SET_DEFAULT(ParallelGCThreads, 1901 Abstract_VM_Version::parallel_worker_threads()); 1902 if (ParallelGCThreads == 0) { 1903 jio_fprintf(defaultStream::error_stream(), 1904 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1905 vm_exit(1); 1906 } 1907 1908 if (UseAdaptiveSizePolicy) { 1909 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1910 // unless the user actually sets these flags. 1911 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1912 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1913 } 1914 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1915 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1916 } 1917 } 1918 1919 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1920 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1921 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1922 // See CR 6362902 for details. 1923 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1924 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1925 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1926 } 1927 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1928 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1929 } 1930 } 1931 1932 if (UseParallelOldGC) { 1933 // Par compact uses lower default values since they are treated as 1934 // minimums. These are different defaults because of the different 1935 // interpretation and are not ergonomically set. 1936 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1937 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1938 } 1939 } 1940 } 1941 1942 void Arguments::set_g1_gc_flags() { 1943 assert(UseG1GC, "Error"); 1944 #if defined(COMPILER1) || INCLUDE_JVMCI 1945 FastTLABRefill = false; 1946 #endif 1947 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1948 if (ParallelGCThreads == 0) { 1949 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1950 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1951 } 1952 1953 #if INCLUDE_ALL_GCS 1954 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1955 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1956 } 1957 #endif 1958 1959 // MarkStackSize will be set (if it hasn't been set by the user) 1960 // when concurrent marking is initialized. 1961 // Its value will be based upon the number of parallel marking threads. 1962 // But we do set the maximum mark stack size here. 1963 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1964 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1965 } 1966 1967 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1968 // In G1, we want the default GC overhead goal to be higher than 1969 // it is for PS, or the heap might be expanded too aggressively. 1970 // We set it here to ~8%. 1971 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1972 } 1973 1974 // Below, we might need to calculate the pause time interval based on 1975 // the pause target. When we do so we are going to give G1 maximum 1976 // flexibility and allow it to do pauses when it needs to. So, we'll 1977 // arrange that the pause interval to be pause time target + 1 to 1978 // ensure that a) the pause time target is maximized with respect to 1979 // the pause interval and b) we maintain the invariant that pause 1980 // time target < pause interval. If the user does not want this 1981 // maximum flexibility, they will have to set the pause interval 1982 // explicitly. 1983 1984 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1985 // The default pause time target in G1 is 200ms 1986 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1987 } 1988 1989 // Then, if the interval parameter was not set, set it according to 1990 // the pause time target (this will also deal with the case when the 1991 // pause time target is the default value). 1992 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1993 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1994 } 1995 1996 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1997 } 1998 1999 void Arguments::set_gc_specific_flags() { 2000 #if INCLUDE_ALL_GCS 2001 // Set per-collector flags 2002 if (UseParallelGC || UseParallelOldGC) { 2003 set_parallel_gc_flags(); 2004 } else if (UseConcMarkSweepGC) { 2005 set_cms_and_parnew_gc_flags(); 2006 } else if (UseG1GC) { 2007 set_g1_gc_flags(); 2008 } 2009 if (AssumeMP && !UseSerialGC) { 2010 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2011 warning("If the number of processors is expected to increase from one, then" 2012 " you should configure the number of parallel GC threads appropriately" 2013 " using -XX:ParallelGCThreads=N"); 2014 } 2015 } 2016 if (MinHeapFreeRatio == 100) { 2017 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2018 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2019 } 2020 2021 // If class unloading is disabled, also disable concurrent class unloading. 2022 if (!ClassUnloading) { 2023 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2024 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2025 } 2026 #endif // INCLUDE_ALL_GCS 2027 } 2028 2029 julong Arguments::limit_by_allocatable_memory(julong limit) { 2030 julong max_allocatable; 2031 julong result = limit; 2032 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2033 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2034 } 2035 return result; 2036 } 2037 2038 // Use static initialization to get the default before parsing 2039 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2040 2041 void Arguments::set_heap_size() { 2042 julong phys_mem = 2043 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2044 : (julong)MaxRAM; 2045 2046 // Experimental support for CGroup memory limits 2047 if (UseCGroupMemoryLimitForHeap) { 2048 // This is a rough indicator that a CGroup limit may be in force 2049 // for this process 2050 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 2051 FILE *fp = fopen(lim_file, "r"); 2052 if (fp != NULL) { 2053 julong cgroup_max = 0; 2054 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2055 if (ret == 1 && cgroup_max > 0) { 2056 // If unlimited, cgroup_max will be a very large, but unspecified 2057 // value, so use initial phys_mem as a limit 2058 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2059 JULONG_FORMAT "MB) and initial phys_mem (" 2060 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2061 phys_mem = MIN2(cgroup_max, phys_mem); 2062 } else { 2063 warning("Unable to read/parse cgroup memory limit from %s: %s", 2064 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2065 } 2066 fclose(fp); 2067 } else { 2068 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2069 } 2070 } 2071 2072 // Convert deprecated flags 2073 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 2074 !FLAG_IS_DEFAULT(MaxRAMFraction)) 2075 MaxRAMPercentage = 100.0 / MaxRAMFraction; 2076 2077 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 2078 !FLAG_IS_DEFAULT(MinRAMFraction)) 2079 MinRAMPercentage = 100.0 / MinRAMFraction; 2080 2081 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 2082 !FLAG_IS_DEFAULT(InitialRAMFraction)) 2083 InitialRAMPercentage = 100.0 / InitialRAMFraction; 2084 2085 // If the maximum heap size has not been set with -Xmx, 2086 // then set it as fraction of the size of physical memory, 2087 // respecting the maximum and minimum sizes of the heap. 2088 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2089 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 2090 if (phys_mem <= (julong)((MaxHeapSize * MinRAMPercentage) / 100)) { 2091 // Small physical memory, so use a minimum fraction of it for the heap 2092 reasonable_max = (julong)((phys_mem * MinRAMPercentage) / 100); 2093 } else { 2094 // Not-small physical memory, so require a heap at least 2095 // as large as MaxHeapSize 2096 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2097 } 2098 2099 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2100 // Limit the heap size to ErgoHeapSizeLimit 2101 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2102 } 2103 if (UseCompressedOops) { 2104 // Limit the heap size to the maximum possible when using compressed oops 2105 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2106 2107 // HeapBaseMinAddress can be greater than default but not less than. 2108 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2109 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2110 // matches compressed oops printing flags 2111 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2112 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2113 DefaultHeapBaseMinAddress, 2114 DefaultHeapBaseMinAddress/G, 2115 HeapBaseMinAddress); 2116 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2117 } 2118 } 2119 2120 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2121 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2122 // but it should be not less than default MaxHeapSize. 2123 max_coop_heap -= HeapBaseMinAddress; 2124 } 2125 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2126 } 2127 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2128 2129 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2130 // An initial heap size was specified on the command line, 2131 // so be sure that the maximum size is consistent. Done 2132 // after call to limit_by_allocatable_memory because that 2133 // method might reduce the allocation size. 2134 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2135 } 2136 2137 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2138 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2139 } 2140 2141 // If the minimum or initial heap_size have not been set or requested to be set 2142 // ergonomically, set them accordingly. 2143 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2144 julong reasonable_minimum = (julong)(OldSize + NewSize); 2145 2146 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2147 2148 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2149 2150 if (InitialHeapSize == 0) { 2151 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 2152 2153 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2154 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2155 2156 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2157 2158 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2159 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2160 } 2161 // If the minimum heap size has not been set (via -Xms), 2162 // synchronize with InitialHeapSize to avoid errors with the default value. 2163 if (min_heap_size() == 0) { 2164 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2165 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2166 } 2167 } 2168 } 2169 2170 // This option inspects the machine and attempts to set various 2171 // parameters to be optimal for long-running, memory allocation 2172 // intensive jobs. It is intended for machines with large 2173 // amounts of cpu and memory. 2174 jint Arguments::set_aggressive_heap_flags() { 2175 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2176 // VM, but we may not be able to represent the total physical memory 2177 // available (like having 8gb of memory on a box but using a 32bit VM). 2178 // Thus, we need to make sure we're using a julong for intermediate 2179 // calculations. 2180 julong initHeapSize; 2181 julong total_memory = os::physical_memory(); 2182 2183 if (total_memory < (julong) 256 * M) { 2184 jio_fprintf(defaultStream::error_stream(), 2185 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2186 vm_exit(1); 2187 } 2188 2189 // The heap size is half of available memory, or (at most) 2190 // all of possible memory less 160mb (leaving room for the OS 2191 // when using ISM). This is the maximum; because adaptive sizing 2192 // is turned on below, the actual space used may be smaller. 2193 2194 initHeapSize = MIN2(total_memory / (julong) 2, 2195 total_memory - (julong) 160 * M); 2196 2197 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2198 2199 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2200 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2201 return JNI_EINVAL; 2202 } 2203 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2204 return JNI_EINVAL; 2205 } 2206 // Currently the minimum size and the initial heap sizes are the same. 2207 set_min_heap_size(initHeapSize); 2208 } 2209 if (FLAG_IS_DEFAULT(NewSize)) { 2210 // Make the young generation 3/8ths of the total heap. 2211 if (FLAG_SET_CMDLINE(size_t, NewSize, 2212 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2213 return JNI_EINVAL; 2214 } 2215 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2216 return JNI_EINVAL; 2217 } 2218 } 2219 2220 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2221 FLAG_SET_DEFAULT(UseLargePages, true); 2222 #endif 2223 2224 // Increase some data structure sizes for efficiency 2225 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2226 return JNI_EINVAL; 2227 } 2228 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2229 return JNI_EINVAL; 2230 } 2231 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2232 return JNI_EINVAL; 2233 } 2234 2235 // See the OldPLABSize comment below, but replace 'after promotion' 2236 // with 'after copying'. YoungPLABSize is the size of the survivor 2237 // space per-gc-thread buffers. The default is 4kw. 2238 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2239 return JNI_EINVAL; 2240 } 2241 2242 // OldPLABSize is the size of the buffers in the old gen that 2243 // UseParallelGC uses to promote live data that doesn't fit in the 2244 // survivor spaces. At any given time, there's one for each gc thread. 2245 // The default size is 1kw. These buffers are rarely used, since the 2246 // survivor spaces are usually big enough. For specjbb, however, there 2247 // are occasions when there's lots of live data in the young gen 2248 // and we end up promoting some of it. We don't have a definite 2249 // explanation for why bumping OldPLABSize helps, but the theory 2250 // is that a bigger PLAB results in retaining something like the 2251 // original allocation order after promotion, which improves mutator 2252 // locality. A minor effect may be that larger PLABs reduce the 2253 // number of PLAB allocation events during gc. The value of 8kw 2254 // was arrived at by experimenting with specjbb. 2255 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2256 return JNI_EINVAL; 2257 } 2258 2259 // Enable parallel GC and adaptive generation sizing 2260 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2261 return JNI_EINVAL; 2262 } 2263 2264 // Encourage steady state memory management 2265 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2266 return JNI_EINVAL; 2267 } 2268 2269 // This appears to improve mutator locality 2270 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2271 return JNI_EINVAL; 2272 } 2273 2274 // Get around early Solaris scheduling bug 2275 // (affinity vs other jobs on system) 2276 // but disallow DR and offlining (5008695). 2277 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2278 return JNI_EINVAL; 2279 } 2280 2281 return JNI_OK; 2282 } 2283 2284 // This must be called after ergonomics. 2285 void Arguments::set_bytecode_flags() { 2286 if (!RewriteBytecodes) { 2287 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2288 } 2289 } 2290 2291 // Aggressive optimization flags -XX:+AggressiveOpts 2292 jint Arguments::set_aggressive_opts_flags() { 2293 #ifdef COMPILER2 2294 if (AggressiveUnboxing) { 2295 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2296 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2297 } else if (!EliminateAutoBox) { 2298 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2299 AggressiveUnboxing = false; 2300 } 2301 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2302 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2303 } else if (!DoEscapeAnalysis) { 2304 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2305 AggressiveUnboxing = false; 2306 } 2307 } 2308 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2309 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2310 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2311 } 2312 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2313 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2314 } 2315 2316 // Feed the cache size setting into the JDK 2317 char buffer[1024]; 2318 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2319 if (!add_property(buffer)) { 2320 return JNI_ENOMEM; 2321 } 2322 } 2323 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2324 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2325 } 2326 #endif 2327 2328 if (AggressiveOpts) { 2329 // Sample flag setting code 2330 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2331 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2332 // } 2333 } 2334 2335 return JNI_OK; 2336 } 2337 2338 //=========================================================================================================== 2339 // Parsing of java.compiler property 2340 2341 void Arguments::process_java_compiler_argument(const char* arg) { 2342 // For backwards compatibility, Djava.compiler=NONE or "" 2343 // causes us to switch to -Xint mode UNLESS -Xdebug 2344 // is also specified. 2345 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2346 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2347 } 2348 } 2349 2350 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2351 _sun_java_launcher = os::strdup_check_oom(launcher); 2352 } 2353 2354 bool Arguments::created_by_java_launcher() { 2355 assert(_sun_java_launcher != NULL, "property must have value"); 2356 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2357 } 2358 2359 bool Arguments::sun_java_launcher_is_altjvm() { 2360 return _sun_java_launcher_is_altjvm; 2361 } 2362 2363 //=========================================================================================================== 2364 // Parsing of main arguments 2365 2366 #if INCLUDE_JVMCI 2367 // Check consistency of jvmci vm argument settings. 2368 bool Arguments::check_jvmci_args_consistency() { 2369 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2370 } 2371 #endif //INCLUDE_JVMCI 2372 2373 // Check consistency of GC selection 2374 bool Arguments::check_gc_consistency() { 2375 // Ensure that the user has not selected conflicting sets 2376 // of collectors. 2377 uint i = 0; 2378 if (UseSerialGC) i++; 2379 if (UseConcMarkSweepGC) i++; 2380 if (UseParallelGC || UseParallelOldGC) i++; 2381 if (UseG1GC) i++; 2382 if (i > 1) { 2383 jio_fprintf(defaultStream::error_stream(), 2384 "Conflicting collector combinations in option list; " 2385 "please refer to the release notes for the combinations " 2386 "allowed\n"); 2387 return false; 2388 } 2389 2390 return true; 2391 } 2392 2393 // Check the consistency of vm_init_args 2394 bool Arguments::check_vm_args_consistency() { 2395 // Method for adding checks for flag consistency. 2396 // The intent is to warn the user of all possible conflicts, 2397 // before returning an error. 2398 // Note: Needs platform-dependent factoring. 2399 bool status = true; 2400 2401 if (TLABRefillWasteFraction == 0) { 2402 jio_fprintf(defaultStream::error_stream(), 2403 "TLABRefillWasteFraction should be a denominator, " 2404 "not " SIZE_FORMAT "\n", 2405 TLABRefillWasteFraction); 2406 status = false; 2407 } 2408 2409 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2410 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2411 } 2412 2413 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2414 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2415 } 2416 2417 if (GCTimeLimit == 100) { 2418 // Turn off gc-overhead-limit-exceeded checks 2419 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2420 } 2421 2422 status = status && check_gc_consistency(); 2423 2424 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2425 // insists that we hold the requisite locks so that the iteration is 2426 // MT-safe. For the verification at start-up and shut-down, we don't 2427 // yet have a good way of acquiring and releasing these locks, 2428 // which are not visible at the CollectedHeap level. We want to 2429 // be able to acquire these locks and then do the iteration rather 2430 // than just disable the lock verification. This will be fixed under 2431 // bug 4788986. 2432 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2433 if (VerifyDuringStartup) { 2434 warning("Heap verification at start-up disabled " 2435 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2436 VerifyDuringStartup = false; // Disable verification at start-up 2437 } 2438 2439 if (VerifyBeforeExit) { 2440 warning("Heap verification at shutdown disabled " 2441 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2442 VerifyBeforeExit = false; // Disable verification at shutdown 2443 } 2444 } 2445 2446 if (PrintNMTStatistics) { 2447 #if INCLUDE_NMT 2448 if (MemTracker::tracking_level() == NMT_off) { 2449 #endif // INCLUDE_NMT 2450 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2451 PrintNMTStatistics = false; 2452 #if INCLUDE_NMT 2453 } 2454 #endif 2455 } 2456 2457 #if INCLUDE_JVMCI 2458 status = status && check_jvmci_args_consistency(); 2459 2460 if (EnableJVMCI) { 2461 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2462 AddProperty, UnwriteableProperty, InternalProperty); 2463 2464 if (!ScavengeRootsInCode) { 2465 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2466 ScavengeRootsInCode = 1; 2467 } 2468 } 2469 #endif 2470 2471 // Check lower bounds of the code cache 2472 // Template Interpreter code is approximately 3X larger in debug builds. 2473 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2474 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2475 jio_fprintf(defaultStream::error_stream(), 2476 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2477 os::vm_page_size()/K); 2478 status = false; 2479 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2480 jio_fprintf(defaultStream::error_stream(), 2481 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2482 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2483 status = false; 2484 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2485 jio_fprintf(defaultStream::error_stream(), 2486 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2487 min_code_cache_size/K); 2488 status = false; 2489 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2490 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2491 jio_fprintf(defaultStream::error_stream(), 2492 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2493 CODE_CACHE_SIZE_LIMIT/M); 2494 status = false; 2495 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2496 jio_fprintf(defaultStream::error_stream(), 2497 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2498 min_code_cache_size/K); 2499 status = false; 2500 } 2501 2502 #ifdef _LP64 2503 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2504 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2505 } 2506 #endif 2507 2508 #ifndef SUPPORT_RESERVED_STACK_AREA 2509 if (StackReservedPages != 0) { 2510 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2511 warning("Reserved Stack Area not supported on this platform"); 2512 } 2513 #endif 2514 2515 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2516 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2517 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2518 } 2519 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2520 } 2521 if (UseCompiler && is_interpreter_only()) { 2522 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2523 warning("UseCompiler disabled due to -Xint."); 2524 } 2525 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2526 } 2527 #ifdef COMPILER2 2528 if (PostLoopMultiversioning && !RangeCheckElimination) { 2529 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2530 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2531 } 2532 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2533 } 2534 #endif 2535 return status; 2536 } 2537 2538 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2539 const char* option_type) { 2540 if (ignore) return false; 2541 2542 const char* spacer = " "; 2543 if (option_type == NULL) { 2544 option_type = ++spacer; // Set both to the empty string. 2545 } 2546 2547 if (os::obsolete_option(option)) { 2548 jio_fprintf(defaultStream::error_stream(), 2549 "Obsolete %s%soption: %s\n", option_type, spacer, 2550 option->optionString); 2551 return false; 2552 } else { 2553 jio_fprintf(defaultStream::error_stream(), 2554 "Unrecognized %s%soption: %s\n", option_type, spacer, 2555 option->optionString); 2556 return true; 2557 } 2558 } 2559 2560 static const char* user_assertion_options[] = { 2561 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2562 }; 2563 2564 static const char* system_assertion_options[] = { 2565 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2566 }; 2567 2568 bool Arguments::parse_uintx(const char* value, 2569 uintx* uintx_arg, 2570 uintx min_size) { 2571 2572 // Check the sign first since atojulong() parses only unsigned values. 2573 bool value_is_positive = !(*value == '-'); 2574 2575 if (value_is_positive) { 2576 julong n; 2577 bool good_return = atojulong(value, &n); 2578 if (good_return) { 2579 bool above_minimum = n >= min_size; 2580 bool value_is_too_large = n > max_uintx; 2581 2582 if (above_minimum && !value_is_too_large) { 2583 *uintx_arg = n; 2584 return true; 2585 } 2586 } 2587 } 2588 return false; 2589 } 2590 2591 unsigned int addreads_count = 0; 2592 unsigned int addexports_count = 0; 2593 unsigned int addopens_count = 0; 2594 unsigned int addmods_count = 0; 2595 unsigned int patch_mod_count = 0; 2596 2597 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2598 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2599 char* property = AllocateHeap(prop_len, mtArguments); 2600 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2601 if (ret < 0 || ret >= (int)prop_len) { 2602 FreeHeap(property); 2603 return false; 2604 } 2605 bool added = add_property(property, UnwriteableProperty, internal); 2606 FreeHeap(property); 2607 return added; 2608 } 2609 2610 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2611 const unsigned int props_count_limit = 1000; 2612 const int max_digits = 3; 2613 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2614 2615 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2616 if (count < props_count_limit) { 2617 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2618 char* property = AllocateHeap(prop_len, mtArguments); 2619 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2620 if (ret < 0 || ret >= (int)prop_len) { 2621 FreeHeap(property); 2622 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2623 return false; 2624 } 2625 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2626 FreeHeap(property); 2627 return added; 2628 } 2629 2630 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2631 return false; 2632 } 2633 2634 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2635 julong* long_arg, 2636 julong min_size, 2637 julong max_size) { 2638 if (!atojulong(s, long_arg)) return arg_unreadable; 2639 return check_memory_size(*long_arg, min_size, max_size); 2640 } 2641 2642 // Parse JavaVMInitArgs structure 2643 2644 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2645 const JavaVMInitArgs *java_options_args, 2646 const JavaVMInitArgs *cmd_line_args) { 2647 bool patch_mod_javabase = false; 2648 2649 // Save default settings for some mode flags 2650 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2651 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2652 Arguments::_ClipInlining = ClipInlining; 2653 Arguments::_BackgroundCompilation = BackgroundCompilation; 2654 if (TieredCompilation) { 2655 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2656 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2657 } 2658 2659 // Setup flags for mixed which is the default 2660 set_mode_flags(_mixed); 2661 2662 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2663 // variable (if present). 2664 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2665 if (result != JNI_OK) { 2666 return result; 2667 } 2668 2669 // Parse args structure generated from the command line flags. 2670 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2671 if (result != JNI_OK) { 2672 return result; 2673 } 2674 2675 // Parse args structure generated from the _JAVA_OPTIONS environment 2676 // variable (if present) (mimics classic VM) 2677 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2678 if (result != JNI_OK) { 2679 return result; 2680 } 2681 2682 // Do final processing now that all arguments have been parsed 2683 result = finalize_vm_init_args(patch_mod_javabase); 2684 if (result != JNI_OK) { 2685 return result; 2686 } 2687 2688 return JNI_OK; 2689 } 2690 2691 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2692 // represents a valid JDWP agent. is_path==true denotes that we 2693 // are dealing with -agentpath (case where name is a path), otherwise with 2694 // -agentlib 2695 bool valid_jdwp_agent(char *name, bool is_path) { 2696 char *_name; 2697 const char *_jdwp = "jdwp"; 2698 size_t _len_jdwp, _len_prefix; 2699 2700 if (is_path) { 2701 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2702 return false; 2703 } 2704 2705 _name++; // skip past last path separator 2706 _len_prefix = strlen(JNI_LIB_PREFIX); 2707 2708 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2709 return false; 2710 } 2711 2712 _name += _len_prefix; 2713 _len_jdwp = strlen(_jdwp); 2714 2715 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2716 _name += _len_jdwp; 2717 } 2718 else { 2719 return false; 2720 } 2721 2722 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2723 return false; 2724 } 2725 2726 return true; 2727 } 2728 2729 if (strcmp(name, _jdwp) == 0) { 2730 return true; 2731 } 2732 2733 return false; 2734 } 2735 2736 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2737 // --patch-module=<module>=<file>(<pathsep><file>)* 2738 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2739 // Find the equal sign between the module name and the path specification 2740 const char* module_equal = strchr(patch_mod_tail, '='); 2741 if (module_equal == NULL) { 2742 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2743 return JNI_ERR; 2744 } else { 2745 // Pick out the module name 2746 size_t module_len = module_equal - patch_mod_tail; 2747 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2748 if (module_name != NULL) { 2749 memcpy(module_name, patch_mod_tail, module_len); 2750 *(module_name + module_len) = '\0'; 2751 // The path piece begins one past the module_equal sign 2752 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2753 FREE_C_HEAP_ARRAY(char, module_name); 2754 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2755 return JNI_ENOMEM; 2756 } 2757 } else { 2758 return JNI_ENOMEM; 2759 } 2760 } 2761 return JNI_OK; 2762 } 2763 2764 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2765 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2766 // The min and max sizes match the values in globals.hpp, but scaled 2767 // with K. The values have been chosen so that alignment with page 2768 // size doesn't change the max value, which makes the conversions 2769 // back and forth between Xss value and ThreadStackSize value easier. 2770 // The values have also been chosen to fit inside a 32-bit signed type. 2771 const julong min_ThreadStackSize = 0; 2772 const julong max_ThreadStackSize = 1 * M; 2773 2774 const julong min_size = min_ThreadStackSize * K; 2775 const julong max_size = max_ThreadStackSize * K; 2776 2777 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2778 2779 julong size = 0; 2780 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2781 if (errcode != arg_in_range) { 2782 bool silent = (option == NULL); // Allow testing to silence error messages 2783 if (!silent) { 2784 jio_fprintf(defaultStream::error_stream(), 2785 "Invalid thread stack size: %s\n", option->optionString); 2786 describe_range_error(errcode); 2787 } 2788 return JNI_EINVAL; 2789 } 2790 2791 // Internally track ThreadStackSize in units of 1024 bytes. 2792 const julong size_aligned = align_up(size, K); 2793 assert(size <= size_aligned, 2794 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2795 size, size_aligned); 2796 2797 const julong size_in_K = size_aligned / K; 2798 assert(size_in_K < (julong)max_intx, 2799 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2800 size_in_K); 2801 2802 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2803 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2804 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2805 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2806 max_expanded, size_in_K); 2807 2808 *out_ThreadStackSize = (intx)size_in_K; 2809 2810 return JNI_OK; 2811 } 2812 2813 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2814 // For match_option to return remaining or value part of option string 2815 const char* tail; 2816 2817 // iterate over arguments 2818 for (int index = 0; index < args->nOptions; index++) { 2819 bool is_absolute_path = false; // for -agentpath vs -agentlib 2820 2821 const JavaVMOption* option = args->options + index; 2822 2823 if (!match_option(option, "-Djava.class.path", &tail) && 2824 !match_option(option, "-Dsun.java.command", &tail) && 2825 !match_option(option, "-Dsun.java.launcher", &tail)) { 2826 2827 // add all jvm options to the jvm_args string. This string 2828 // is used later to set the java.vm.args PerfData string constant. 2829 // the -Djava.class.path and the -Dsun.java.command options are 2830 // omitted from jvm_args string as each have their own PerfData 2831 // string constant object. 2832 build_jvm_args(option->optionString); 2833 } 2834 2835 // -verbose:[class/module/gc/jni] 2836 if (match_option(option, "-verbose", &tail)) { 2837 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2838 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2839 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2840 } else if (!strcmp(tail, ":module")) { 2841 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2842 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2843 } else if (!strcmp(tail, ":gc")) { 2844 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2845 } else if (!strcmp(tail, ":jni")) { 2846 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2847 return JNI_EINVAL; 2848 } 2849 } 2850 // -da / -ea / -disableassertions / -enableassertions 2851 // These accept an optional class/package name separated by a colon, e.g., 2852 // -da:java.lang.Thread. 2853 } else if (match_option(option, user_assertion_options, &tail, true)) { 2854 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2855 if (*tail == '\0') { 2856 JavaAssertions::setUserClassDefault(enable); 2857 } else { 2858 assert(*tail == ':', "bogus match by match_option()"); 2859 JavaAssertions::addOption(tail + 1, enable); 2860 } 2861 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2862 } else if (match_option(option, system_assertion_options, &tail, false)) { 2863 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2864 JavaAssertions::setSystemClassDefault(enable); 2865 // -bootclasspath: 2866 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2867 jio_fprintf(defaultStream::output_stream(), 2868 "-Xbootclasspath is no longer a supported option.\n"); 2869 return JNI_EINVAL; 2870 // -bootclasspath/a: 2871 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2872 Arguments::append_sysclasspath(tail); 2873 // -bootclasspath/p: 2874 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2875 jio_fprintf(defaultStream::output_stream(), 2876 "-Xbootclasspath/p is no longer a supported option.\n"); 2877 return JNI_EINVAL; 2878 // -Xrun 2879 } else if (match_option(option, "-Xrun", &tail)) { 2880 if (tail != NULL) { 2881 const char* pos = strchr(tail, ':'); 2882 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2883 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2884 jio_snprintf(name, len + 1, "%s", tail); 2885 2886 char *options = NULL; 2887 if(pos != NULL) { 2888 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2889 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2890 } 2891 #if !INCLUDE_JVMTI 2892 if (strcmp(name, "jdwp") == 0) { 2893 jio_fprintf(defaultStream::error_stream(), 2894 "Debugging agents are not supported in this VM\n"); 2895 return JNI_ERR; 2896 } 2897 #endif // !INCLUDE_JVMTI 2898 add_init_library(name, options); 2899 } 2900 } else if (match_option(option, "--add-reads=", &tail)) { 2901 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2902 return JNI_ENOMEM; 2903 } 2904 } else if (match_option(option, "--add-exports=", &tail)) { 2905 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2906 return JNI_ENOMEM; 2907 } 2908 } else if (match_option(option, "--add-opens=", &tail)) { 2909 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2910 return JNI_ENOMEM; 2911 } 2912 } else if (match_option(option, "--add-modules=", &tail)) { 2913 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2914 return JNI_ENOMEM; 2915 } 2916 } else if (match_option(option, "--limit-modules=", &tail)) { 2917 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2918 return JNI_ENOMEM; 2919 } 2920 } else if (match_option(option, "--module-path=", &tail)) { 2921 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2922 return JNI_ENOMEM; 2923 } 2924 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2925 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2926 return JNI_ENOMEM; 2927 } 2928 } else if (match_option(option, "--patch-module=", &tail)) { 2929 // --patch-module=<module>=<file>(<pathsep><file>)* 2930 int res = process_patch_mod_option(tail, patch_mod_javabase); 2931 if (res != JNI_OK) { 2932 return res; 2933 } 2934 } else if (match_option(option, "--illegal-access=", &tail)) { 2935 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2936 return JNI_ENOMEM; 2937 } 2938 // -agentlib and -agentpath 2939 } else if (match_option(option, "-agentlib:", &tail) || 2940 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2941 if(tail != NULL) { 2942 const char* pos = strchr(tail, '='); 2943 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2944 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2945 name[len] = '\0'; 2946 2947 char *options = NULL; 2948 if(pos != NULL) { 2949 options = os::strdup_check_oom(pos + 1, mtArguments); 2950 } 2951 #if !INCLUDE_JVMTI 2952 if (valid_jdwp_agent(name, is_absolute_path)) { 2953 jio_fprintf(defaultStream::error_stream(), 2954 "Debugging agents are not supported in this VM\n"); 2955 return JNI_ERR; 2956 } 2957 #endif // !INCLUDE_JVMTI 2958 add_init_agent(name, options, is_absolute_path); 2959 } 2960 // -javaagent 2961 } else if (match_option(option, "-javaagent:", &tail)) { 2962 #if !INCLUDE_JVMTI 2963 jio_fprintf(defaultStream::error_stream(), 2964 "Instrumentation agents are not supported in this VM\n"); 2965 return JNI_ERR; 2966 #else 2967 if (tail != NULL) { 2968 size_t length = strlen(tail) + 1; 2969 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2970 jio_snprintf(options, length, "%s", tail); 2971 add_init_agent("instrument", options, false); 2972 // java agents need module java.instrument 2973 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2974 return JNI_ENOMEM; 2975 } 2976 } 2977 #endif // !INCLUDE_JVMTI 2978 // -Xnoclassgc 2979 } else if (match_option(option, "-Xnoclassgc")) { 2980 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2981 return JNI_EINVAL; 2982 } 2983 // -Xconcgc 2984 } else if (match_option(option, "-Xconcgc")) { 2985 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2986 return JNI_EINVAL; 2987 } 2988 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2989 // -Xnoconcgc 2990 } else if (match_option(option, "-Xnoconcgc")) { 2991 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2995 // -Xbatch 2996 } else if (match_option(option, "-Xbatch")) { 2997 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2998 return JNI_EINVAL; 2999 } 3000 // -Xmn for compatibility with other JVM vendors 3001 } else if (match_option(option, "-Xmn", &tail)) { 3002 julong long_initial_young_size = 0; 3003 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 3004 if (errcode != arg_in_range) { 3005 jio_fprintf(defaultStream::error_stream(), 3006 "Invalid initial young generation size: %s\n", option->optionString); 3007 describe_range_error(errcode); 3008 return JNI_EINVAL; 3009 } 3010 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 3011 return JNI_EINVAL; 3012 } 3013 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 3014 return JNI_EINVAL; 3015 } 3016 // -Xms 3017 } else if (match_option(option, "-Xms", &tail)) { 3018 julong long_initial_heap_size = 0; 3019 // an initial heap size of 0 means automatically determine 3020 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 3021 if (errcode != arg_in_range) { 3022 jio_fprintf(defaultStream::error_stream(), 3023 "Invalid initial heap size: %s\n", option->optionString); 3024 describe_range_error(errcode); 3025 return JNI_EINVAL; 3026 } 3027 set_min_heap_size((size_t)long_initial_heap_size); 3028 // Currently the minimum size and the initial heap sizes are the same. 3029 // Can be overridden with -XX:InitialHeapSize. 3030 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 3031 return JNI_EINVAL; 3032 } 3033 // -Xmx 3034 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 3035 julong long_max_heap_size = 0; 3036 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 3037 if (errcode != arg_in_range) { 3038 jio_fprintf(defaultStream::error_stream(), 3039 "Invalid maximum heap size: %s\n", option->optionString); 3040 describe_range_error(errcode); 3041 return JNI_EINVAL; 3042 } 3043 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 3044 return JNI_EINVAL; 3045 } 3046 // Xmaxf 3047 } else if (match_option(option, "-Xmaxf", &tail)) { 3048 char* err; 3049 int maxf = (int)(strtod(tail, &err) * 100); 3050 if (*err != '\0' || *tail == '\0') { 3051 jio_fprintf(defaultStream::error_stream(), 3052 "Bad max heap free percentage size: %s\n", 3053 option->optionString); 3054 return JNI_EINVAL; 3055 } else { 3056 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 3057 return JNI_EINVAL; 3058 } 3059 } 3060 // Xminf 3061 } else if (match_option(option, "-Xminf", &tail)) { 3062 char* err; 3063 int minf = (int)(strtod(tail, &err) * 100); 3064 if (*err != '\0' || *tail == '\0') { 3065 jio_fprintf(defaultStream::error_stream(), 3066 "Bad min heap free percentage size: %s\n", 3067 option->optionString); 3068 return JNI_EINVAL; 3069 } else { 3070 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3071 return JNI_EINVAL; 3072 } 3073 } 3074 // -Xss 3075 } else if (match_option(option, "-Xss", &tail)) { 3076 intx value = 0; 3077 jint err = parse_xss(option, tail, &value); 3078 if (err != JNI_OK) { 3079 return err; 3080 } 3081 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) { 3082 return JNI_EINVAL; 3083 } 3084 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3085 julong long_CodeCacheExpansionSize = 0; 3086 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3087 if (errcode != arg_in_range) { 3088 jio_fprintf(defaultStream::error_stream(), 3089 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3090 os::vm_page_size()/K); 3091 return JNI_EINVAL; 3092 } 3093 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3094 return JNI_EINVAL; 3095 } 3096 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3097 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3098 julong long_ReservedCodeCacheSize = 0; 3099 3100 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3101 if (errcode != arg_in_range) { 3102 jio_fprintf(defaultStream::error_stream(), 3103 "Invalid maximum code cache size: %s.\n", option->optionString); 3104 return JNI_EINVAL; 3105 } 3106 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3107 return JNI_EINVAL; 3108 } 3109 // -XX:NonNMethodCodeHeapSize= 3110 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3111 julong long_NonNMethodCodeHeapSize = 0; 3112 3113 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3114 if (errcode != arg_in_range) { 3115 jio_fprintf(defaultStream::error_stream(), 3116 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3117 return JNI_EINVAL; 3118 } 3119 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3120 return JNI_EINVAL; 3121 } 3122 // -XX:ProfiledCodeHeapSize= 3123 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3124 julong long_ProfiledCodeHeapSize = 0; 3125 3126 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3127 if (errcode != arg_in_range) { 3128 jio_fprintf(defaultStream::error_stream(), 3129 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3130 return JNI_EINVAL; 3131 } 3132 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3133 return JNI_EINVAL; 3134 } 3135 // -XX:NonProfiledCodeHeapSizee= 3136 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3137 julong long_NonProfiledCodeHeapSize = 0; 3138 3139 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3140 if (errcode != arg_in_range) { 3141 jio_fprintf(defaultStream::error_stream(), 3142 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3143 return JNI_EINVAL; 3144 } 3145 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3146 return JNI_EINVAL; 3147 } 3148 // -green 3149 } else if (match_option(option, "-green")) { 3150 jio_fprintf(defaultStream::error_stream(), 3151 "Green threads support not available\n"); 3152 return JNI_EINVAL; 3153 // -native 3154 } else if (match_option(option, "-native")) { 3155 // HotSpot always uses native threads, ignore silently for compatibility 3156 // -Xrs 3157 } else if (match_option(option, "-Xrs")) { 3158 // Classic/EVM option, new functionality 3159 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3160 return JNI_EINVAL; 3161 } 3162 // -Xprof 3163 } else if (match_option(option, "-Xprof")) { 3164 char version[256]; 3165 // Obsolete in JDK 10 3166 JDK_Version::jdk(10).to_string(version, sizeof(version)); 3167 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3168 // -Xconcurrentio 3169 } else if (match_option(option, "-Xconcurrentio")) { 3170 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3171 return JNI_EINVAL; 3172 } 3173 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3174 return JNI_EINVAL; 3175 } 3176 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3177 return JNI_EINVAL; 3178 } 3179 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3180 return JNI_EINVAL; 3181 } 3182 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3183 return JNI_EINVAL; 3184 } 3185 3186 // -Xinternalversion 3187 } else if (match_option(option, "-Xinternalversion")) { 3188 jio_fprintf(defaultStream::output_stream(), "%s\n", 3189 VM_Version::internal_vm_info_string()); 3190 vm_exit(0); 3191 #ifndef PRODUCT 3192 // -Xprintflags 3193 } else if (match_option(option, "-Xprintflags")) { 3194 CommandLineFlags::printFlags(tty, false); 3195 vm_exit(0); 3196 #endif 3197 // -D 3198 } else if (match_option(option, "-D", &tail)) { 3199 const char* value; 3200 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3201 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3202 // abort if -Djava.endorsed.dirs is set 3203 jio_fprintf(defaultStream::output_stream(), 3204 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3205 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3206 return JNI_EINVAL; 3207 } 3208 if (match_option(option, "-Djava.ext.dirs=", &value) && 3209 *value != '\0' && strcmp(value, "\"\"") != 0) { 3210 // abort if -Djava.ext.dirs is set 3211 jio_fprintf(defaultStream::output_stream(), 3212 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3213 return JNI_EINVAL; 3214 } 3215 // Check for module related properties. They must be set using the modules 3216 // options. For example: use "--add-modules=java.sql", not 3217 // "-Djdk.module.addmods=java.sql" 3218 if (is_internal_module_property(option->optionString + 2)) { 3219 needs_module_property_warning = true; 3220 continue; 3221 } 3222 3223 if (!add_property(tail)) { 3224 return JNI_ENOMEM; 3225 } 3226 // Out of the box management support 3227 if (match_option(option, "-Dcom.sun.management", &tail)) { 3228 #if INCLUDE_MANAGEMENT 3229 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3230 return JNI_EINVAL; 3231 } 3232 // management agent in module jdk.management.agent 3233 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3234 return JNI_ENOMEM; 3235 } 3236 #else 3237 jio_fprintf(defaultStream::output_stream(), 3238 "-Dcom.sun.management is not supported in this VM.\n"); 3239 return JNI_ERR; 3240 #endif 3241 } 3242 // -Xint 3243 } else if (match_option(option, "-Xint")) { 3244 set_mode_flags(_int); 3245 // -Xmixed 3246 } else if (match_option(option, "-Xmixed")) { 3247 set_mode_flags(_mixed); 3248 // -Xcomp 3249 } else if (match_option(option, "-Xcomp")) { 3250 // for testing the compiler; turn off all flags that inhibit compilation 3251 set_mode_flags(_comp); 3252 // -Xshare:dump 3253 } else if (match_option(option, "-Xshare:dump")) { 3254 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3255 return JNI_EINVAL; 3256 } 3257 set_mode_flags(_int); // Prevent compilation, which creates objects 3258 // -Xshare:on 3259 } else if (match_option(option, "-Xshare:on")) { 3260 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3261 return JNI_EINVAL; 3262 } 3263 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3264 return JNI_EINVAL; 3265 } 3266 // -Xshare:auto 3267 } else if (match_option(option, "-Xshare:auto")) { 3268 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3269 return JNI_EINVAL; 3270 } 3271 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3272 return JNI_EINVAL; 3273 } 3274 // -Xshare:off 3275 } else if (match_option(option, "-Xshare:off")) { 3276 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3277 return JNI_EINVAL; 3278 } 3279 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3280 return JNI_EINVAL; 3281 } 3282 // -Xverify 3283 } else if (match_option(option, "-Xverify", &tail)) { 3284 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3285 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3286 return JNI_EINVAL; 3287 } 3288 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3289 return JNI_EINVAL; 3290 } 3291 } else if (strcmp(tail, ":remote") == 0) { 3292 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3293 return JNI_EINVAL; 3294 } 3295 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3296 return JNI_EINVAL; 3297 } 3298 } else if (strcmp(tail, ":none") == 0) { 3299 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3300 return JNI_EINVAL; 3301 } 3302 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3303 return JNI_EINVAL; 3304 } 3305 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3306 return JNI_EINVAL; 3307 } 3308 // -Xdebug 3309 } else if (match_option(option, "-Xdebug")) { 3310 // note this flag has been used, then ignore 3311 set_xdebug_mode(true); 3312 // -Xnoagent 3313 } else if (match_option(option, "-Xnoagent")) { 3314 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3315 } else if (match_option(option, "-Xloggc:", &tail)) { 3316 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3317 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3318 _gc_log_filename = os::strdup_check_oom(tail); 3319 } else if (match_option(option, "-Xlog", &tail)) { 3320 bool ret = false; 3321 if (strcmp(tail, ":help") == 0) { 3322 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3323 vm_exit(0); 3324 } else if (strcmp(tail, ":disable") == 0) { 3325 LogConfiguration::disable_logging(); 3326 ret = true; 3327 } else if (*tail == '\0') { 3328 ret = LogConfiguration::parse_command_line_arguments(); 3329 assert(ret, "-Xlog without arguments should never fail to parse"); 3330 } else if (*tail == ':') { 3331 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3332 } 3333 if (ret == false) { 3334 jio_fprintf(defaultStream::error_stream(), 3335 "Invalid -Xlog option '-Xlog%s'\n", 3336 tail); 3337 return JNI_EINVAL; 3338 } 3339 // JNI hooks 3340 } else if (match_option(option, "-Xcheck", &tail)) { 3341 if (!strcmp(tail, ":jni")) { 3342 #if !INCLUDE_JNI_CHECK 3343 warning("JNI CHECKING is not supported in this VM"); 3344 #else 3345 CheckJNICalls = true; 3346 #endif // INCLUDE_JNI_CHECK 3347 } else if (is_bad_option(option, args->ignoreUnrecognized, 3348 "check")) { 3349 return JNI_EINVAL; 3350 } 3351 } else if (match_option(option, "vfprintf")) { 3352 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3353 } else if (match_option(option, "exit")) { 3354 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3355 } else if (match_option(option, "abort")) { 3356 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3357 // -XX:+AggressiveHeap 3358 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3359 jint result = set_aggressive_heap_flags(); 3360 if (result != JNI_OK) { 3361 return result; 3362 } 3363 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3364 // and the last option wins. 3365 } else if (match_option(option, "-XX:+NeverTenure")) { 3366 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3367 return JNI_EINVAL; 3368 } 3369 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3370 return JNI_EINVAL; 3371 } 3372 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3373 return JNI_EINVAL; 3374 } 3375 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3376 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3377 return JNI_EINVAL; 3378 } 3379 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3380 return JNI_EINVAL; 3381 } 3382 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3383 return JNI_EINVAL; 3384 } 3385 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3386 uintx max_tenuring_thresh = 0; 3387 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3388 jio_fprintf(defaultStream::error_stream(), 3389 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3390 return JNI_EINVAL; 3391 } 3392 3393 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3394 return JNI_EINVAL; 3395 } 3396 3397 if (MaxTenuringThreshold == 0) { 3398 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3399 return JNI_EINVAL; 3400 } 3401 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3402 return JNI_EINVAL; 3403 } 3404 } else { 3405 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3406 return JNI_EINVAL; 3407 } 3408 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3409 return JNI_EINVAL; 3410 } 3411 } 3412 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3413 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3414 return JNI_EINVAL; 3415 } 3416 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3417 return JNI_EINVAL; 3418 } 3419 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3420 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3421 return JNI_EINVAL; 3422 } 3423 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3424 return JNI_EINVAL; 3425 } 3426 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3427 #if defined(DTRACE_ENABLED) 3428 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3429 return JNI_EINVAL; 3430 } 3431 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3432 return JNI_EINVAL; 3433 } 3434 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3435 return JNI_EINVAL; 3436 } 3437 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3438 return JNI_EINVAL; 3439 } 3440 #else // defined(DTRACE_ENABLED) 3441 jio_fprintf(defaultStream::error_stream(), 3442 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3443 return JNI_EINVAL; 3444 #endif // defined(DTRACE_ENABLED) 3445 #ifdef ASSERT 3446 } else if (match_option(option, "-XX:+FullGCALot")) { 3447 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3448 return JNI_EINVAL; 3449 } 3450 // disable scavenge before parallel mark-compact 3451 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3452 return JNI_EINVAL; 3453 } 3454 #endif 3455 #if !INCLUDE_MANAGEMENT 3456 } else if (match_option(option, "-XX:+ManagementServer")) { 3457 jio_fprintf(defaultStream::error_stream(), 3458 "ManagementServer is not supported in this VM.\n"); 3459 return JNI_ERR; 3460 #endif // INCLUDE_MANAGEMENT 3461 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3462 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3463 // already been handled 3464 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3465 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3466 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3467 return JNI_EINVAL; 3468 } 3469 } 3470 // Unknown option 3471 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3472 return JNI_ERR; 3473 } 3474 } 3475 3476 // PrintSharedArchiveAndExit will turn on 3477 // -Xshare:on 3478 // -Xlog:class+path=info 3479 if (PrintSharedArchiveAndExit) { 3480 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3481 return JNI_EINVAL; 3482 } 3483 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3484 return JNI_EINVAL; 3485 } 3486 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3487 } 3488 3489 // Change the default value for flags which have different default values 3490 // when working with older JDKs. 3491 #ifdef LINUX 3492 if (JDK_Version::current().compare_major(6) <= 0 && 3493 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3494 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3495 } 3496 #endif // LINUX 3497 fix_appclasspath(); 3498 return JNI_OK; 3499 } 3500 3501 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3502 // For java.base check for duplicate --patch-module options being specified on the command line. 3503 // This check is only required for java.base, all other duplicate module specifications 3504 // will be checked during module system initialization. The module system initialization 3505 // will throw an ExceptionInInitializerError if this situation occurs. 3506 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3507 if (*patch_mod_javabase) { 3508 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3509 } else { 3510 *patch_mod_javabase = true; 3511 } 3512 } 3513 3514 // Create GrowableArray lazily, only if --patch-module has been specified 3515 if (_patch_mod_prefix == NULL) { 3516 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3517 } 3518 3519 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3520 } 3521 3522 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3523 // 3524 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3525 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3526 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3527 // path is treated as the current directory. 3528 // 3529 // This causes problems with CDS, which requires that all directories specified in the classpath 3530 // must be empty. In most cases, applications do NOT want to load classes from the current 3531 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3532 // scripts compatible with CDS. 3533 void Arguments::fix_appclasspath() { 3534 if (IgnoreEmptyClassPaths) { 3535 const char separator = *os::path_separator(); 3536 const char* src = _java_class_path->value(); 3537 3538 // skip over all the leading empty paths 3539 while (*src == separator) { 3540 src ++; 3541 } 3542 3543 char* copy = os::strdup_check_oom(src, mtArguments); 3544 3545 // trim all trailing empty paths 3546 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3547 *tail = '\0'; 3548 } 3549 3550 char from[3] = {separator, separator, '\0'}; 3551 char to [2] = {separator, '\0'}; 3552 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3553 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3554 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3555 } 3556 3557 _java_class_path->set_writeable_value(copy); 3558 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3559 } 3560 } 3561 3562 static bool has_jar_files(const char* directory) { 3563 DIR* dir = os::opendir(directory); 3564 if (dir == NULL) return false; 3565 3566 struct dirent *entry; 3567 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3568 bool hasJarFile = false; 3569 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3570 const char* name = entry->d_name; 3571 const char* ext = name + strlen(name) - 4; 3572 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3573 } 3574 FREE_C_HEAP_ARRAY(char, dbuf); 3575 os::closedir(dir); 3576 return hasJarFile ; 3577 } 3578 3579 static int check_non_empty_dirs(const char* path) { 3580 const char separator = *os::path_separator(); 3581 const char* const end = path + strlen(path); 3582 int nonEmptyDirs = 0; 3583 while (path < end) { 3584 const char* tmp_end = strchr(path, separator); 3585 if (tmp_end == NULL) { 3586 if (has_jar_files(path)) { 3587 nonEmptyDirs++; 3588 jio_fprintf(defaultStream::output_stream(), 3589 "Non-empty directory: %s\n", path); 3590 } 3591 path = end; 3592 } else { 3593 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3594 memcpy(dirpath, path, tmp_end - path); 3595 dirpath[tmp_end - path] = '\0'; 3596 if (has_jar_files(dirpath)) { 3597 nonEmptyDirs++; 3598 jio_fprintf(defaultStream::output_stream(), 3599 "Non-empty directory: %s\n", dirpath); 3600 } 3601 FREE_C_HEAP_ARRAY(char, dirpath); 3602 path = tmp_end + 1; 3603 } 3604 } 3605 return nonEmptyDirs; 3606 } 3607 3608 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3609 // check if the default lib/endorsed directory exists; if so, error 3610 char path[JVM_MAXPATHLEN]; 3611 const char* fileSep = os::file_separator(); 3612 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3613 3614 if (CheckEndorsedAndExtDirs) { 3615 int nonEmptyDirs = 0; 3616 // check endorsed directory 3617 nonEmptyDirs += check_non_empty_dirs(path); 3618 // check the extension directories 3619 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3620 if (nonEmptyDirs > 0) { 3621 return JNI_ERR; 3622 } 3623 } 3624 3625 DIR* dir = os::opendir(path); 3626 if (dir != NULL) { 3627 jio_fprintf(defaultStream::output_stream(), 3628 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3629 "in modular form will be supported via the concept of upgradeable modules.\n"); 3630 os::closedir(dir); 3631 return JNI_ERR; 3632 } 3633 3634 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3635 dir = os::opendir(path); 3636 if (dir != NULL) { 3637 jio_fprintf(defaultStream::output_stream(), 3638 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3639 "Use -classpath instead.\n."); 3640 os::closedir(dir); 3641 return JNI_ERR; 3642 } 3643 3644 // This must be done after all arguments have been processed. 3645 // java_compiler() true means set to "NONE" or empty. 3646 if (java_compiler() && !xdebug_mode()) { 3647 // For backwards compatibility, we switch to interpreted mode if 3648 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3649 // not specified. 3650 set_mode_flags(_int); 3651 } 3652 3653 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3654 // but like -Xint, leave compilation thresholds unaffected. 3655 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3656 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3657 set_mode_flags(_int); 3658 } 3659 3660 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3661 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3662 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3663 } 3664 3665 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3666 // Don't degrade server performance for footprint 3667 if (FLAG_IS_DEFAULT(UseLargePages) && 3668 MaxHeapSize < LargePageHeapSizeThreshold) { 3669 // No need for large granularity pages w/small heaps. 3670 // Note that large pages are enabled/disabled for both the 3671 // Java heap and the code cache. 3672 FLAG_SET_DEFAULT(UseLargePages, false); 3673 } 3674 3675 #elif defined(COMPILER2) 3676 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3677 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3678 } 3679 #endif 3680 3681 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3682 UNSUPPORTED_OPTION(ProfileInterpreter); 3683 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3684 #endif 3685 3686 #ifndef TIERED 3687 // Tiered compilation is undefined. 3688 UNSUPPORTED_OPTION(TieredCompilation); 3689 #endif 3690 3691 #if INCLUDE_JVMCI 3692 if (EnableJVMCI && 3693 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3694 return JNI_ENOMEM; 3695 } 3696 #endif 3697 3698 // If we are running in a headless jre, force java.awt.headless property 3699 // to be true unless the property has already been set. 3700 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3701 if (os::is_headless_jre()) { 3702 const char* headless = Arguments::get_property("java.awt.headless"); 3703 if (headless == NULL) { 3704 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3705 if (headless_env == NULL) { 3706 if (!add_property("java.awt.headless=true")) { 3707 return JNI_ENOMEM; 3708 } 3709 } else { 3710 char buffer[256]; 3711 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3712 if (!add_property(buffer)) { 3713 return JNI_ENOMEM; 3714 } 3715 } 3716 } 3717 } 3718 3719 if (!check_vm_args_consistency()) { 3720 return JNI_ERR; 3721 } 3722 3723 #if INCLUDE_JVMCI 3724 if (UseJVMCICompiler) { 3725 Compilation_mode = CompMode_server; 3726 } 3727 #endif 3728 3729 #if INCLUDE_CDS 3730 if (DumpSharedSpaces) { 3731 // Disable biased locking now as it interferes with the clean up of 3732 // the archived Klasses and Java string objects (at dump time only). 3733 UseBiasedLocking = false; 3734 } 3735 if (UseSharedSpaces && patch_mod_javabase) { 3736 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3737 } 3738 #endif 3739 3740 return JNI_OK; 3741 } 3742 3743 // Helper class for controlling the lifetime of JavaVMInitArgs 3744 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3745 // deleted on the destruction of the ScopedVMInitArgs object. 3746 class ScopedVMInitArgs : public StackObj { 3747 private: 3748 JavaVMInitArgs _args; 3749 char* _container_name; 3750 bool _is_set; 3751 char* _vm_options_file_arg; 3752 3753 public: 3754 ScopedVMInitArgs(const char *container_name) { 3755 _args.version = JNI_VERSION_1_2; 3756 _args.nOptions = 0; 3757 _args.options = NULL; 3758 _args.ignoreUnrecognized = false; 3759 _container_name = (char *)container_name; 3760 _is_set = false; 3761 _vm_options_file_arg = NULL; 3762 } 3763 3764 // Populates the JavaVMInitArgs object represented by this 3765 // ScopedVMInitArgs object with the arguments in options. The 3766 // allocated memory is deleted by the destructor. If this method 3767 // returns anything other than JNI_OK, then this object is in a 3768 // partially constructed state, and should be abandoned. 3769 jint set_args(GrowableArray<JavaVMOption>* options) { 3770 _is_set = true; 3771 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3772 JavaVMOption, options->length(), mtArguments); 3773 if (options_arr == NULL) { 3774 return JNI_ENOMEM; 3775 } 3776 _args.options = options_arr; 3777 3778 for (int i = 0; i < options->length(); i++) { 3779 options_arr[i] = options->at(i); 3780 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3781 if (options_arr[i].optionString == NULL) { 3782 // Rely on the destructor to do cleanup. 3783 _args.nOptions = i; 3784 return JNI_ENOMEM; 3785 } 3786 } 3787 3788 _args.nOptions = options->length(); 3789 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3790 return JNI_OK; 3791 } 3792 3793 JavaVMInitArgs* get() { return &_args; } 3794 char* container_name() { return _container_name; } 3795 bool is_set() { return _is_set; } 3796 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3797 char* vm_options_file_arg() { return _vm_options_file_arg; } 3798 3799 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3800 if (_vm_options_file_arg != NULL) { 3801 os::free(_vm_options_file_arg); 3802 } 3803 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3804 } 3805 3806 ~ScopedVMInitArgs() { 3807 if (_vm_options_file_arg != NULL) { 3808 os::free(_vm_options_file_arg); 3809 } 3810 if (_args.options == NULL) return; 3811 for (int i = 0; i < _args.nOptions; i++) { 3812 os::free(_args.options[i].optionString); 3813 } 3814 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3815 } 3816 3817 // Insert options into this option list, to replace option at 3818 // vm_options_file_pos (-XX:VMOptionsFile) 3819 jint insert(const JavaVMInitArgs* args, 3820 const JavaVMInitArgs* args_to_insert, 3821 const int vm_options_file_pos) { 3822 assert(_args.options == NULL, "shouldn't be set yet"); 3823 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3824 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3825 3826 int length = args->nOptions + args_to_insert->nOptions - 1; 3827 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3828 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3829 for (int i = 0; i < args->nOptions; i++) { 3830 if (i == vm_options_file_pos) { 3831 // insert the new options starting at the same place as the 3832 // -XX:VMOptionsFile option 3833 for (int j = 0; j < args_to_insert->nOptions; j++) { 3834 options->push(args_to_insert->options[j]); 3835 } 3836 } else { 3837 options->push(args->options[i]); 3838 } 3839 } 3840 // make into options array 3841 jint result = set_args(options); 3842 delete options; 3843 return result; 3844 } 3845 }; 3846 3847 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3848 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3849 } 3850 3851 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3852 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3853 } 3854 3855 jint Arguments::parse_options_environment_variable(const char* name, 3856 ScopedVMInitArgs* vm_args) { 3857 char *buffer = ::getenv(name); 3858 3859 // Don't check this environment variable if user has special privileges 3860 // (e.g. unix su command). 3861 if (buffer == NULL || os::have_special_privileges()) { 3862 return JNI_OK; 3863 } 3864 3865 if ((buffer = os::strdup(buffer)) == NULL) { 3866 return JNI_ENOMEM; 3867 } 3868 3869 jio_fprintf(defaultStream::error_stream(), 3870 "Picked up %s: %s\n", name, buffer); 3871 3872 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3873 3874 os::free(buffer); 3875 return retcode; 3876 } 3877 3878 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3879 // read file into buffer 3880 int fd = ::open(file_name, O_RDONLY); 3881 if (fd < 0) { 3882 jio_fprintf(defaultStream::error_stream(), 3883 "Could not open options file '%s'\n", 3884 file_name); 3885 return JNI_ERR; 3886 } 3887 3888 struct stat stbuf; 3889 int retcode = os::stat(file_name, &stbuf); 3890 if (retcode != 0) { 3891 jio_fprintf(defaultStream::error_stream(), 3892 "Could not stat options file '%s'\n", 3893 file_name); 3894 os::close(fd); 3895 return JNI_ERR; 3896 } 3897 3898 if (stbuf.st_size == 0) { 3899 // tell caller there is no option data and that is ok 3900 os::close(fd); 3901 return JNI_OK; 3902 } 3903 3904 // '+ 1' for NULL termination even with max bytes 3905 size_t bytes_alloc = stbuf.st_size + 1; 3906 3907 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3908 if (NULL == buf) { 3909 jio_fprintf(defaultStream::error_stream(), 3910 "Could not allocate read buffer for options file parse\n"); 3911 os::close(fd); 3912 return JNI_ENOMEM; 3913 } 3914 3915 memset(buf, 0, bytes_alloc); 3916 3917 // Fill buffer 3918 // Use ::read() instead of os::read because os::read() 3919 // might do a thread state transition 3920 // and it is too early for that here 3921 3922 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3923 os::close(fd); 3924 if (bytes_read < 0) { 3925 FREE_C_HEAP_ARRAY(char, buf); 3926 jio_fprintf(defaultStream::error_stream(), 3927 "Could not read options file '%s'\n", file_name); 3928 return JNI_ERR; 3929 } 3930 3931 if (bytes_read == 0) { 3932 // tell caller there is no option data and that is ok 3933 FREE_C_HEAP_ARRAY(char, buf); 3934 return JNI_OK; 3935 } 3936 3937 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3938 3939 FREE_C_HEAP_ARRAY(char, buf); 3940 return retcode; 3941 } 3942 3943 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3944 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3945 3946 // some pointers to help with parsing 3947 char *buffer_end = buffer + buf_len; 3948 char *opt_hd = buffer; 3949 char *wrt = buffer; 3950 char *rd = buffer; 3951 3952 // parse all options 3953 while (rd < buffer_end) { 3954 // skip leading white space from the input string 3955 while (rd < buffer_end && isspace(*rd)) { 3956 rd++; 3957 } 3958 3959 if (rd >= buffer_end) { 3960 break; 3961 } 3962 3963 // Remember this is where we found the head of the token. 3964 opt_hd = wrt; 3965 3966 // Tokens are strings of non white space characters separated 3967 // by one or more white spaces. 3968 while (rd < buffer_end && !isspace(*rd)) { 3969 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3970 int quote = *rd; // matching quote to look for 3971 rd++; // don't copy open quote 3972 while (rd < buffer_end && *rd != quote) { 3973 // include everything (even spaces) 3974 // up until the close quote 3975 *wrt++ = *rd++; // copy to option string 3976 } 3977 3978 if (rd < buffer_end) { 3979 rd++; // don't copy close quote 3980 } else { 3981 // did not see closing quote 3982 jio_fprintf(defaultStream::error_stream(), 3983 "Unmatched quote in %s\n", name); 3984 delete options; 3985 return JNI_ERR; 3986 } 3987 } else { 3988 *wrt++ = *rd++; // copy to option string 3989 } 3990 } 3991 3992 // steal a white space character and set it to NULL 3993 *wrt++ = '\0'; 3994 // We now have a complete token 3995 3996 JavaVMOption option; 3997 option.optionString = opt_hd; 3998 option.extraInfo = NULL; 3999 4000 options->append(option); // Fill in option 4001 4002 rd++; // Advance to next character 4003 } 4004 4005 // Fill out JavaVMInitArgs structure. 4006 jint status = vm_args->set_args(options); 4007 4008 delete options; 4009 return status; 4010 } 4011 4012 void Arguments::set_shared_spaces_flags() { 4013 if (DumpSharedSpaces) { 4014 if (FailOverToOldVerifier) { 4015 // Don't fall back to the old verifier on verification failure. If a 4016 // class fails verification with the split verifier, it might fail the 4017 // CDS runtime verifier constraint check. In that case, we don't want 4018 // to share the class. We only archive classes that pass the split verifier. 4019 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 4020 } 4021 4022 if (RequireSharedSpaces) { 4023 warning("Cannot dump shared archive while using shared archive"); 4024 } 4025 UseSharedSpaces = false; 4026 #ifdef _LP64 4027 if (!UseCompressedOops || !UseCompressedClassPointers) { 4028 vm_exit_during_initialization( 4029 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 4030 } 4031 } else { 4032 if (!UseCompressedOops || !UseCompressedClassPointers) { 4033 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 4034 } 4035 #endif 4036 } 4037 } 4038 4039 // Sharing support 4040 // Construct the path to the archive 4041 static char* get_shared_archive_path() { 4042 char *shared_archive_path; 4043 if (SharedArchiveFile == NULL) { 4044 char jvm_path[JVM_MAXPATHLEN]; 4045 os::jvm_path(jvm_path, sizeof(jvm_path)); 4046 char *end = strrchr(jvm_path, *os::file_separator()); 4047 if (end != NULL) *end = '\0'; 4048 size_t jvm_path_len = strlen(jvm_path); 4049 size_t file_sep_len = strlen(os::file_separator()); 4050 const size_t len = jvm_path_len + file_sep_len + 20; 4051 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 4052 if (shared_archive_path != NULL) { 4053 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 4054 jvm_path, os::file_separator()); 4055 } 4056 } else { 4057 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 4058 } 4059 return shared_archive_path; 4060 } 4061 4062 #ifndef PRODUCT 4063 // Determine whether LogVMOutput should be implicitly turned on. 4064 static bool use_vm_log() { 4065 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4066 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4067 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4068 PrintAssembly || TraceDeoptimization || TraceDependencies || 4069 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4070 return true; 4071 } 4072 4073 #ifdef COMPILER1 4074 if (PrintC1Statistics) { 4075 return true; 4076 } 4077 #endif // COMPILER1 4078 4079 #ifdef COMPILER2 4080 if (PrintOptoAssembly || PrintOptoStatistics) { 4081 return true; 4082 } 4083 #endif // COMPILER2 4084 4085 return false; 4086 } 4087 4088 #endif // PRODUCT 4089 4090 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4091 for (int index = 0; index < args->nOptions; index++) { 4092 const JavaVMOption* option = args->options + index; 4093 const char* tail; 4094 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4095 return true; 4096 } 4097 } 4098 return false; 4099 } 4100 4101 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4102 const char* vm_options_file, 4103 const int vm_options_file_pos, 4104 ScopedVMInitArgs* vm_options_file_args, 4105 ScopedVMInitArgs* args_out) { 4106 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4107 if (code != JNI_OK) { 4108 return code; 4109 } 4110 4111 if (vm_options_file_args->get()->nOptions < 1) { 4112 return JNI_OK; 4113 } 4114 4115 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4116 jio_fprintf(defaultStream::error_stream(), 4117 "A VM options file may not refer to a VM options file. " 4118 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4119 "options file '%s' in options container '%s' is an error.\n", 4120 vm_options_file_args->vm_options_file_arg(), 4121 vm_options_file_args->container_name()); 4122 return JNI_EINVAL; 4123 } 4124 4125 return args_out->insert(args, vm_options_file_args->get(), 4126 vm_options_file_pos); 4127 } 4128 4129 // Expand -XX:VMOptionsFile found in args_in as needed. 4130 // mod_args and args_out parameters may return values as needed. 4131 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4132 ScopedVMInitArgs* mod_args, 4133 JavaVMInitArgs** args_out) { 4134 jint code = match_special_option_and_act(args_in, mod_args); 4135 if (code != JNI_OK) { 4136 return code; 4137 } 4138 4139 if (mod_args->is_set()) { 4140 // args_in contains -XX:VMOptionsFile and mod_args contains the 4141 // original options from args_in along with the options expanded 4142 // from the VMOptionsFile. Return a short-hand to the caller. 4143 *args_out = mod_args->get(); 4144 } else { 4145 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4146 } 4147 return JNI_OK; 4148 } 4149 4150 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4151 ScopedVMInitArgs* args_out) { 4152 // Remaining part of option string 4153 const char* tail; 4154 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4155 4156 for (int index = 0; index < args->nOptions; index++) { 4157 const JavaVMOption* option = args->options + index; 4158 if (ArgumentsExt::process_options(option)) { 4159 continue; 4160 } 4161 if (match_option(option, "-XX:Flags=", &tail)) { 4162 Arguments::set_jvm_flags_file(tail); 4163 continue; 4164 } 4165 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4166 if (vm_options_file_args.found_vm_options_file_arg()) { 4167 jio_fprintf(defaultStream::error_stream(), 4168 "The option '%s' is already specified in the options " 4169 "container '%s' so the specification of '%s' in the " 4170 "same options container is an error.\n", 4171 vm_options_file_args.vm_options_file_arg(), 4172 vm_options_file_args.container_name(), 4173 option->optionString); 4174 return JNI_EINVAL; 4175 } 4176 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4177 // If there's a VMOptionsFile, parse that 4178 jint code = insert_vm_options_file(args, tail, index, 4179 &vm_options_file_args, args_out); 4180 if (code != JNI_OK) { 4181 return code; 4182 } 4183 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4184 if (args_out->is_set()) { 4185 // The VMOptions file inserted some options so switch 'args' 4186 // to the new set of options, and continue processing which 4187 // preserves "last option wins" semantics. 4188 args = args_out->get(); 4189 // The first option from the VMOptionsFile replaces the 4190 // current option. So we back track to process the 4191 // replacement option. 4192 index--; 4193 } 4194 continue; 4195 } 4196 if (match_option(option, "-XX:+PrintVMOptions")) { 4197 PrintVMOptions = true; 4198 continue; 4199 } 4200 if (match_option(option, "-XX:-PrintVMOptions")) { 4201 PrintVMOptions = false; 4202 continue; 4203 } 4204 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4205 IgnoreUnrecognizedVMOptions = true; 4206 continue; 4207 } 4208 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4209 IgnoreUnrecognizedVMOptions = false; 4210 continue; 4211 } 4212 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4213 CommandLineFlags::printFlags(tty, false); 4214 vm_exit(0); 4215 } 4216 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4217 #if INCLUDE_NMT 4218 // The launcher did not setup nmt environment variable properly. 4219 if (!MemTracker::check_launcher_nmt_support(tail)) { 4220 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4221 } 4222 4223 // Verify if nmt option is valid. 4224 if (MemTracker::verify_nmt_option()) { 4225 // Late initialization, still in single-threaded mode. 4226 if (MemTracker::tracking_level() >= NMT_summary) { 4227 MemTracker::init(); 4228 } 4229 } else { 4230 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4231 } 4232 continue; 4233 #else 4234 jio_fprintf(defaultStream::error_stream(), 4235 "Native Memory Tracking is not supported in this VM\n"); 4236 return JNI_ERR; 4237 #endif 4238 } 4239 4240 #ifndef PRODUCT 4241 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4242 CommandLineFlags::printFlags(tty, true); 4243 vm_exit(0); 4244 } 4245 #endif 4246 } 4247 return JNI_OK; 4248 } 4249 4250 static void print_options(const JavaVMInitArgs *args) { 4251 const char* tail; 4252 for (int index = 0; index < args->nOptions; index++) { 4253 const JavaVMOption *option = args->options + index; 4254 if (match_option(option, "-XX:", &tail)) { 4255 logOption(tail); 4256 } 4257 } 4258 } 4259 4260 bool Arguments::handle_deprecated_print_gc_flags() { 4261 if (PrintGC) { 4262 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4263 } 4264 if (PrintGCDetails) { 4265 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4266 } 4267 4268 if (_gc_log_filename != NULL) { 4269 // -Xloggc was used to specify a filename 4270 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4271 4272 LogTarget(Error, logging) target; 4273 LogStream errstream(target); 4274 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4275 } else if (PrintGC || PrintGCDetails) { 4276 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4277 } 4278 return true; 4279 } 4280 4281 void Arguments::handle_extra_cms_flags(const char* msg) { 4282 SpecialFlag flag; 4283 const char *flag_name = "UseConcMarkSweepGC"; 4284 if (lookup_special_flag(flag_name, flag)) { 4285 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4286 warning("%s", msg); 4287 } 4288 } 4289 4290 // Parse entry point called from JNI_CreateJavaVM 4291 4292 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4293 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4294 4295 // Initialize ranges, constraints and writeables 4296 CommandLineFlagRangeList::init(); 4297 CommandLineFlagConstraintList::init(); 4298 CommandLineFlagWriteableList::init(); 4299 4300 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4301 const char* hotspotrc = ".hotspotrc"; 4302 bool settings_file_specified = false; 4303 bool needs_hotspotrc_warning = false; 4304 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4305 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4306 4307 // Pointers to current working set of containers 4308 JavaVMInitArgs* cur_cmd_args; 4309 JavaVMInitArgs* cur_java_options_args; 4310 JavaVMInitArgs* cur_java_tool_options_args; 4311 4312 // Containers for modified/expanded options 4313 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4314 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4315 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4316 4317 4318 jint code = 4319 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4320 if (code != JNI_OK) { 4321 return code; 4322 } 4323 4324 code = parse_java_options_environment_variable(&initial_java_options_args); 4325 if (code != JNI_OK) { 4326 return code; 4327 } 4328 4329 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4330 &mod_java_tool_options_args, 4331 &cur_java_tool_options_args); 4332 if (code != JNI_OK) { 4333 return code; 4334 } 4335 4336 code = expand_vm_options_as_needed(initial_cmd_args, 4337 &mod_cmd_args, 4338 &cur_cmd_args); 4339 if (code != JNI_OK) { 4340 return code; 4341 } 4342 4343 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4344 &mod_java_options_args, 4345 &cur_java_options_args); 4346 if (code != JNI_OK) { 4347 return code; 4348 } 4349 4350 const char* flags_file = Arguments::get_jvm_flags_file(); 4351 settings_file_specified = (flags_file != NULL); 4352 4353 if (IgnoreUnrecognizedVMOptions) { 4354 cur_cmd_args->ignoreUnrecognized = true; 4355 cur_java_tool_options_args->ignoreUnrecognized = true; 4356 cur_java_options_args->ignoreUnrecognized = true; 4357 } 4358 4359 // Parse specified settings file 4360 if (settings_file_specified) { 4361 if (!process_settings_file(flags_file, true, 4362 cur_cmd_args->ignoreUnrecognized)) { 4363 return JNI_EINVAL; 4364 } 4365 } else { 4366 #ifdef ASSERT 4367 // Parse default .hotspotrc settings file 4368 if (!process_settings_file(".hotspotrc", false, 4369 cur_cmd_args->ignoreUnrecognized)) { 4370 return JNI_EINVAL; 4371 } 4372 #else 4373 struct stat buf; 4374 if (os::stat(hotspotrc, &buf) == 0) { 4375 needs_hotspotrc_warning = true; 4376 } 4377 #endif 4378 } 4379 4380 if (PrintVMOptions) { 4381 print_options(cur_java_tool_options_args); 4382 print_options(cur_cmd_args); 4383 print_options(cur_java_options_args); 4384 } 4385 4386 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4387 jint result = parse_vm_init_args(cur_java_tool_options_args, 4388 cur_java_options_args, 4389 cur_cmd_args); 4390 4391 if (result != JNI_OK) { 4392 return result; 4393 } 4394 4395 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4396 SharedArchivePath = get_shared_archive_path(); 4397 if (SharedArchivePath == NULL) { 4398 return JNI_ENOMEM; 4399 } 4400 4401 // Set up VerifySharedSpaces 4402 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4403 VerifySharedSpaces = true; 4404 } 4405 4406 // Delay warning until here so that we've had a chance to process 4407 // the -XX:-PrintWarnings flag 4408 if (needs_hotspotrc_warning) { 4409 warning("%s file is present but has been ignored. " 4410 "Run with -XX:Flags=%s to load the file.", 4411 hotspotrc, hotspotrc); 4412 } 4413 4414 if (needs_module_property_warning) { 4415 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4416 " names that are reserved for internal use."); 4417 } 4418 4419 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4420 UNSUPPORTED_OPTION(UseLargePages); 4421 #endif 4422 4423 ArgumentsExt::report_unsupported_options(); 4424 4425 #ifndef PRODUCT 4426 if (TraceBytecodesAt != 0) { 4427 TraceBytecodes = true; 4428 } 4429 if (CountCompiledCalls) { 4430 if (UseCounterDecay) { 4431 warning("UseCounterDecay disabled because CountCalls is set"); 4432 UseCounterDecay = false; 4433 } 4434 } 4435 #endif // PRODUCT 4436 4437 if (ScavengeRootsInCode == 0) { 4438 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4439 warning("Forcing ScavengeRootsInCode non-zero"); 4440 } 4441 ScavengeRootsInCode = 1; 4442 } 4443 4444 if (!handle_deprecated_print_gc_flags()) { 4445 return JNI_EINVAL; 4446 } 4447 4448 // Set object alignment values. 4449 set_object_alignment(); 4450 4451 #if !INCLUDE_CDS 4452 if (DumpSharedSpaces || RequireSharedSpaces) { 4453 jio_fprintf(defaultStream::error_stream(), 4454 "Shared spaces are not supported in this VM\n"); 4455 return JNI_ERR; 4456 } 4457 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 4458 log_is_enabled(Info, cds)) { 4459 warning("Shared spaces are not supported in this VM"); 4460 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4461 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4462 } 4463 no_shared_spaces("CDS Disabled"); 4464 #endif // INCLUDE_CDS 4465 4466 return JNI_OK; 4467 } 4468 4469 jint Arguments::apply_ergo() { 4470 // Set flags based on ergonomics. 4471 set_ergonomics_flags(); 4472 4473 #if INCLUDE_JVMCI 4474 set_jvmci_specific_flags(); 4475 #endif 4476 4477 set_shared_spaces_flags(); 4478 4479 #if defined(SPARC) 4480 // BIS instructions require 'membar' instruction regardless of the number 4481 // of CPUs because in virtualized/container environments which might use only 1 4482 // CPU, BIS instructions may produce incorrect results. 4483 4484 if (FLAG_IS_DEFAULT(AssumeMP)) { 4485 FLAG_SET_DEFAULT(AssumeMP, true); 4486 } 4487 #endif 4488 4489 // Check the GC selections again. 4490 if (!check_gc_consistency()) { 4491 return JNI_EINVAL; 4492 } 4493 4494 if (TieredCompilation) { 4495 set_tiered_flags(); 4496 } else { 4497 int max_compilation_policy_choice = 1; 4498 #ifdef COMPILER2 4499 if (is_server_compilation_mode_vm()) { 4500 max_compilation_policy_choice = 2; 4501 } 4502 #endif 4503 // Check if the policy is valid. 4504 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4505 vm_exit_during_initialization( 4506 "Incompatible compilation policy selected", NULL); 4507 } 4508 // Scale CompileThreshold 4509 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4510 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4511 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4512 } 4513 } 4514 4515 #ifdef COMPILER2 4516 #ifndef PRODUCT 4517 if (PrintIdealGraphLevel > 0) { 4518 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4519 } 4520 #endif 4521 #endif 4522 4523 // Set heap size based on available physical memory 4524 set_heap_size(); 4525 4526 ArgumentsExt::set_gc_specific_flags(); 4527 4528 // Initialize Metaspace flags and alignments 4529 Metaspace::ergo_initialize(); 4530 4531 // Set bytecode rewriting flags 4532 set_bytecode_flags(); 4533 4534 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4535 jint code = set_aggressive_opts_flags(); 4536 if (code != JNI_OK) { 4537 return code; 4538 } 4539 4540 // Turn off biased locking for locking debug mode flags, 4541 // which are subtly different from each other but neither works with 4542 // biased locking 4543 if (UseHeavyMonitors 4544 #ifdef COMPILER1 4545 || !UseFastLocking 4546 #endif // COMPILER1 4547 #if INCLUDE_JVMCI 4548 || !JVMCIUseFastLocking 4549 #endif 4550 ) { 4551 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4552 // flag set to true on command line; warn the user that they 4553 // can't enable biased locking here 4554 warning("Biased Locking is not supported with locking debug flags" 4555 "; ignoring UseBiasedLocking flag." ); 4556 } 4557 UseBiasedLocking = false; 4558 } 4559 4560 #ifdef CC_INTERP 4561 // Clear flags not supported on zero. 4562 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4563 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4564 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4565 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4566 #endif // CC_INTERP 4567 4568 #ifdef COMPILER2 4569 if (!EliminateLocks) { 4570 EliminateNestedLocks = false; 4571 } 4572 if (!Inline) { 4573 IncrementalInline = false; 4574 } 4575 #ifndef PRODUCT 4576 if (!IncrementalInline) { 4577 AlwaysIncrementalInline = false; 4578 } 4579 #endif 4580 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4581 // nothing to use the profiling, turn if off 4582 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4583 } 4584 #endif 4585 4586 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4587 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4588 DebugNonSafepoints = true; 4589 } 4590 4591 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4592 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4593 } 4594 4595 if (UseOnStackReplacement && !UseLoopCounter) { 4596 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4597 FLAG_SET_DEFAULT(UseLoopCounter, true); 4598 } 4599 4600 #ifndef PRODUCT 4601 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4602 if (use_vm_log()) { 4603 LogVMOutput = true; 4604 } 4605 } 4606 #endif // PRODUCT 4607 4608 if (PrintCommandLineFlags) { 4609 CommandLineFlags::printSetFlags(tty); 4610 } 4611 4612 // Apply CPU specific policy for the BiasedLocking 4613 if (UseBiasedLocking) { 4614 if (!VM_Version::use_biased_locking() && 4615 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4616 UseBiasedLocking = false; 4617 } 4618 } 4619 #ifdef COMPILER2 4620 if (!UseBiasedLocking || EmitSync != 0) { 4621 UseOptoBiasInlining = false; 4622 } 4623 #endif 4624 4625 return JNI_OK; 4626 } 4627 4628 jint Arguments::adjust_after_os() { 4629 if (UseNUMA) { 4630 if (UseParallelGC || UseParallelOldGC) { 4631 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4632 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4633 } 4634 } 4635 // UseNUMAInterleaving is set to ON for all collectors and 4636 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4637 // such as the parallel collector for Linux and Solaris will 4638 // interleave old gen and survivor spaces on top of NUMA 4639 // allocation policy for the eden space. 4640 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4641 // all platforms and ParallelGC on Windows will interleave all 4642 // of the heap spaces across NUMA nodes. 4643 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4644 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4645 } 4646 } 4647 return JNI_OK; 4648 } 4649 4650 int Arguments::PropertyList_count(SystemProperty* pl) { 4651 int count = 0; 4652 while(pl != NULL) { 4653 count++; 4654 pl = pl->next(); 4655 } 4656 return count; 4657 } 4658 4659 // Return the number of readable properties. 4660 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4661 int count = 0; 4662 while(pl != NULL) { 4663 if (pl->is_readable()) { 4664 count++; 4665 } 4666 pl = pl->next(); 4667 } 4668 return count; 4669 } 4670 4671 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4672 assert(key != NULL, "just checking"); 4673 SystemProperty* prop; 4674 for (prop = pl; prop != NULL; prop = prop->next()) { 4675 if (strcmp(key, prop->key()) == 0) return prop->value(); 4676 } 4677 return NULL; 4678 } 4679 4680 // Return the value of the requested property provided that it is a readable property. 4681 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4682 assert(key != NULL, "just checking"); 4683 SystemProperty* prop; 4684 // Return the property value if the keys match and the property is not internal or 4685 // it's the special internal property "jdk.boot.class.path.append". 4686 for (prop = pl; prop != NULL; prop = prop->next()) { 4687 if (strcmp(key, prop->key()) == 0) { 4688 if (!prop->internal()) { 4689 return prop->value(); 4690 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4691 return prop->value(); 4692 } else { 4693 // Property is internal and not jdk.boot.class.path.append so return NULL. 4694 return NULL; 4695 } 4696 } 4697 } 4698 return NULL; 4699 } 4700 4701 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4702 int count = 0; 4703 const char* ret_val = NULL; 4704 4705 while(pl != NULL) { 4706 if(count >= index) { 4707 ret_val = pl->key(); 4708 break; 4709 } 4710 count++; 4711 pl = pl->next(); 4712 } 4713 4714 return ret_val; 4715 } 4716 4717 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4718 int count = 0; 4719 char* ret_val = NULL; 4720 4721 while(pl != NULL) { 4722 if(count >= index) { 4723 ret_val = pl->value(); 4724 break; 4725 } 4726 count++; 4727 pl = pl->next(); 4728 } 4729 4730 return ret_val; 4731 } 4732 4733 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4734 SystemProperty* p = *plist; 4735 if (p == NULL) { 4736 *plist = new_p; 4737 } else { 4738 while (p->next() != NULL) { 4739 p = p->next(); 4740 } 4741 p->set_next(new_p); 4742 } 4743 } 4744 4745 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4746 bool writeable, bool internal) { 4747 if (plist == NULL) 4748 return; 4749 4750 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4751 PropertyList_add(plist, new_p); 4752 } 4753 4754 void Arguments::PropertyList_add(SystemProperty *element) { 4755 PropertyList_add(&_system_properties, element); 4756 } 4757 4758 // This add maintains unique property key in the list. 4759 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4760 PropertyAppendable append, PropertyWriteable writeable, 4761 PropertyInternal internal) { 4762 if (plist == NULL) 4763 return; 4764 4765 // If property key exist then update with new value. 4766 SystemProperty* prop; 4767 for (prop = *plist; prop != NULL; prop = prop->next()) { 4768 if (strcmp(k, prop->key()) == 0) { 4769 if (append == AppendProperty) { 4770 prop->append_value(v); 4771 } else { 4772 prop->set_value(v); 4773 } 4774 return; 4775 } 4776 } 4777 4778 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4779 } 4780 4781 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4782 // Returns true if all of the source pointed by src has been copied over to 4783 // the destination buffer pointed by buf. Otherwise, returns false. 4784 // Notes: 4785 // 1. If the length (buflen) of the destination buffer excluding the 4786 // NULL terminator character is not long enough for holding the expanded 4787 // pid characters, it also returns false instead of returning the partially 4788 // expanded one. 4789 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4790 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4791 char* buf, size_t buflen) { 4792 const char* p = src; 4793 char* b = buf; 4794 const char* src_end = &src[srclen]; 4795 char* buf_end = &buf[buflen - 1]; 4796 4797 while (p < src_end && b < buf_end) { 4798 if (*p == '%') { 4799 switch (*(++p)) { 4800 case '%': // "%%" ==> "%" 4801 *b++ = *p++; 4802 break; 4803 case 'p': { // "%p" ==> current process id 4804 // buf_end points to the character before the last character so 4805 // that we could write '\0' to the end of the buffer. 4806 size_t buf_sz = buf_end - b + 1; 4807 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4808 4809 // if jio_snprintf fails or the buffer is not long enough to hold 4810 // the expanded pid, returns false. 4811 if (ret < 0 || ret >= (int)buf_sz) { 4812 return false; 4813 } else { 4814 b += ret; 4815 assert(*b == '\0', "fail in copy_expand_pid"); 4816 if (p == src_end && b == buf_end + 1) { 4817 // reach the end of the buffer. 4818 return true; 4819 } 4820 } 4821 p++; 4822 break; 4823 } 4824 default : 4825 *b++ = '%'; 4826 } 4827 } else { 4828 *b++ = *p++; 4829 } 4830 } 4831 *b = '\0'; 4832 return (p == src_end); // return false if not all of the source was copied 4833 }