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 size_t min_metaspace_sz = InitialBootClassLoaderMetaspaceSize + 1740 (64 * K * HeapWordSize); // MediumChunk in bytes. 1741 1742 if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) { 1743 if (min_metaspace_sz >= MaxMetaspaceSize) { 1744 vm_exit_during_initialization( 1745 "InitialBootClassLoaderMetaspaceSize should be " 1746 "less than MaxMetaspaceSize."); 1747 } else { 1748 FLAG_SET_ERGO(size_t, CompressedClassSpaceSize, 1749 MaxMetaspaceSize - min_metaspace_sz); 1750 } 1751 } 1752 1753 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1754 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1755 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1756 } 1757 } 1758 } 1759 #endif // _LP64 1760 #endif // !ZERO 1761 } 1762 1763 void Arguments::set_conservative_max_heap_alignment() { 1764 // The conservative maximum required alignment for the heap is the maximum of 1765 // the alignments imposed by several sources: any requirements from the heap 1766 // itself, the collector policy and the maximum page size we may run the VM 1767 // with. 1768 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1769 #if INCLUDE_ALL_GCS 1770 if (UseParallelGC) { 1771 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1772 } else if (UseG1GC) { 1773 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1774 } 1775 #endif // INCLUDE_ALL_GCS 1776 _conservative_max_heap_alignment = MAX4(heap_alignment, 1777 (size_t)os::vm_allocation_granularity(), 1778 os::max_page_size(), 1779 CollectorPolicy::compute_heap_alignment()); 1780 } 1781 1782 bool Arguments::gc_selected() { 1783 #if INCLUDE_ALL_GCS 1784 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1785 #else 1786 return UseSerialGC; 1787 #endif // INCLUDE_ALL_GCS 1788 } 1789 1790 #ifdef TIERED 1791 bool Arguments::compilation_mode_selected() { 1792 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1793 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1794 1795 } 1796 1797 void Arguments::select_compilation_mode_ergonomically() { 1798 #if defined(_WINDOWS) && !defined(_LP64) 1799 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1800 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1801 } 1802 #endif 1803 if (NeverActAsServerClassMachine) { 1804 set_client_compilation_mode(); 1805 } 1806 } 1807 #endif //TIERED 1808 1809 void Arguments::select_gc_ergonomically() { 1810 #if INCLUDE_ALL_GCS 1811 if (os::is_server_class_machine()) { 1812 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1813 } else { 1814 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1815 } 1816 #else 1817 UNSUPPORTED_OPTION(UseG1GC); 1818 UNSUPPORTED_OPTION(UseParallelGC); 1819 UNSUPPORTED_OPTION(UseParallelOldGC); 1820 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1821 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1822 #endif // INCLUDE_ALL_GCS 1823 } 1824 1825 void Arguments::select_gc() { 1826 if (!gc_selected()) { 1827 select_gc_ergonomically(); 1828 if (!gc_selected()) { 1829 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1830 } 1831 } 1832 } 1833 1834 #if INCLUDE_JVMCI 1835 void Arguments::set_jvmci_specific_flags() { 1836 if (UseJVMCICompiler) { 1837 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1838 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1839 } 1840 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1841 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1842 } 1843 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1844 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1845 } 1846 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1847 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1848 } 1849 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1850 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1851 } 1852 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1853 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1854 } 1855 if (TieredStopAtLevel != CompLevel_full_optimization) { 1856 // Currently JVMCI compiler can only work at the full optimization level 1857 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1858 TieredStopAtLevel = CompLevel_full_optimization; 1859 } 1860 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1861 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1862 } 1863 } 1864 } 1865 #endif 1866 1867 void Arguments::set_ergonomics_flags() { 1868 #ifdef TIERED 1869 if (!compilation_mode_selected()) { 1870 select_compilation_mode_ergonomically(); 1871 } 1872 #endif 1873 select_gc(); 1874 1875 #if defined(COMPILER2) || INCLUDE_JVMCI 1876 // Shared spaces work fine with other GCs but causes bytecode rewriting 1877 // to be disabled, which hurts interpreter performance and decreases 1878 // server performance. When -server is specified, keep the default off 1879 // unless it is asked for. Future work: either add bytecode rewriting 1880 // at link time, or rewrite bytecodes in non-shared methods. 1881 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1882 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1883 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1884 } 1885 #endif 1886 1887 set_conservative_max_heap_alignment(); 1888 1889 #ifndef ZERO 1890 #ifdef _LP64 1891 set_use_compressed_oops(); 1892 1893 // set_use_compressed_klass_ptrs() must be called after calling 1894 // set_use_compressed_oops(). 1895 set_use_compressed_klass_ptrs(); 1896 1897 // Also checks that certain machines are slower with compressed oops 1898 // in vm_version initialization code. 1899 #endif // _LP64 1900 #endif // !ZERO 1901 1902 } 1903 1904 void Arguments::set_parallel_gc_flags() { 1905 assert(UseParallelGC || UseParallelOldGC, "Error"); 1906 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1907 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1908 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1909 } 1910 FLAG_SET_DEFAULT(UseParallelGC, true); 1911 1912 // If no heap maximum was requested explicitly, use some reasonable fraction 1913 // of the physical memory, up to a maximum of 1GB. 1914 FLAG_SET_DEFAULT(ParallelGCThreads, 1915 Abstract_VM_Version::parallel_worker_threads()); 1916 if (ParallelGCThreads == 0) { 1917 jio_fprintf(defaultStream::error_stream(), 1918 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1919 vm_exit(1); 1920 } 1921 1922 if (UseAdaptiveSizePolicy) { 1923 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1924 // unless the user actually sets these flags. 1925 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1926 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1927 } 1928 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1929 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1930 } 1931 } 1932 1933 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1934 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1935 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1936 // See CR 6362902 for details. 1937 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1938 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1939 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1940 } 1941 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1942 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1943 } 1944 } 1945 1946 if (UseParallelOldGC) { 1947 // Par compact uses lower default values since they are treated as 1948 // minimums. These are different defaults because of the different 1949 // interpretation and are not ergonomically set. 1950 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1951 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1952 } 1953 } 1954 } 1955 1956 void Arguments::set_g1_gc_flags() { 1957 assert(UseG1GC, "Error"); 1958 #if defined(COMPILER1) || INCLUDE_JVMCI 1959 FastTLABRefill = false; 1960 #endif 1961 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1962 if (ParallelGCThreads == 0) { 1963 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1964 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1965 } 1966 1967 #if INCLUDE_ALL_GCS 1968 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1969 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1970 } 1971 #endif 1972 1973 // MarkStackSize will be set (if it hasn't been set by the user) 1974 // when concurrent marking is initialized. 1975 // Its value will be based upon the number of parallel marking threads. 1976 // But we do set the maximum mark stack size here. 1977 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1978 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1979 } 1980 1981 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1982 // In G1, we want the default GC overhead goal to be higher than 1983 // it is for PS, or the heap might be expanded too aggressively. 1984 // We set it here to ~8%. 1985 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1986 } 1987 1988 // Below, we might need to calculate the pause time interval based on 1989 // the pause target. When we do so we are going to give G1 maximum 1990 // flexibility and allow it to do pauses when it needs to. So, we'll 1991 // arrange that the pause interval to be pause time target + 1 to 1992 // ensure that a) the pause time target is maximized with respect to 1993 // the pause interval and b) we maintain the invariant that pause 1994 // time target < pause interval. If the user does not want this 1995 // maximum flexibility, they will have to set the pause interval 1996 // explicitly. 1997 1998 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1999 // The default pause time target in G1 is 200ms 2000 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 2001 } 2002 2003 // Then, if the interval parameter was not set, set it according to 2004 // the pause time target (this will also deal with the case when the 2005 // pause time target is the default value). 2006 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 2007 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 2008 } 2009 2010 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 2011 } 2012 2013 void Arguments::set_gc_specific_flags() { 2014 #if INCLUDE_ALL_GCS 2015 // Set per-collector flags 2016 if (UseParallelGC || UseParallelOldGC) { 2017 set_parallel_gc_flags(); 2018 } else if (UseConcMarkSweepGC) { 2019 set_cms_and_parnew_gc_flags(); 2020 } else if (UseG1GC) { 2021 set_g1_gc_flags(); 2022 } 2023 if (AssumeMP && !UseSerialGC) { 2024 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2025 warning("If the number of processors is expected to increase from one, then" 2026 " you should configure the number of parallel GC threads appropriately" 2027 " using -XX:ParallelGCThreads=N"); 2028 } 2029 } 2030 if (MinHeapFreeRatio == 100) { 2031 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2032 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2033 } 2034 2035 // If class unloading is disabled, also disable concurrent class unloading. 2036 if (!ClassUnloading) { 2037 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2038 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2039 } 2040 #endif // INCLUDE_ALL_GCS 2041 } 2042 2043 julong Arguments::limit_by_allocatable_memory(julong limit) { 2044 julong max_allocatable; 2045 julong result = limit; 2046 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2047 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2048 } 2049 return result; 2050 } 2051 2052 // Use static initialization to get the default before parsing 2053 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2054 2055 void Arguments::set_heap_size() { 2056 julong phys_mem = 2057 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2058 : (julong)MaxRAM; 2059 2060 // Experimental support for CGroup memory limits 2061 if (UseCGroupMemoryLimitForHeap) { 2062 // This is a rough indicator that a CGroup limit may be in force 2063 // for this process 2064 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 2065 FILE *fp = fopen(lim_file, "r"); 2066 if (fp != NULL) { 2067 julong cgroup_max = 0; 2068 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2069 if (ret == 1 && cgroup_max > 0) { 2070 // If unlimited, cgroup_max will be a very large, but unspecified 2071 // value, so use initial phys_mem as a limit 2072 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2073 JULONG_FORMAT "MB) and initial phys_mem (" 2074 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2075 phys_mem = MIN2(cgroup_max, phys_mem); 2076 } else { 2077 warning("Unable to read/parse cgroup memory limit from %s: %s", 2078 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2079 } 2080 fclose(fp); 2081 } else { 2082 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2083 } 2084 } 2085 2086 // Convert deprecated flags 2087 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 2088 !FLAG_IS_DEFAULT(MaxRAMFraction)) 2089 MaxRAMPercentage = 100.0 / MaxRAMFraction; 2090 2091 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 2092 !FLAG_IS_DEFAULT(MinRAMFraction)) 2093 MinRAMPercentage = 100.0 / MinRAMFraction; 2094 2095 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 2096 !FLAG_IS_DEFAULT(InitialRAMFraction)) 2097 InitialRAMPercentage = 100.0 / InitialRAMFraction; 2098 2099 // If the maximum heap size has not been set with -Xmx, 2100 // then set it as fraction of the size of physical memory, 2101 // respecting the maximum and minimum sizes of the heap. 2102 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2103 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 2104 if (phys_mem <= (julong)((MaxHeapSize * MinRAMPercentage) / 100)) { 2105 // Small physical memory, so use a minimum fraction of it for the heap 2106 reasonable_max = (julong)((phys_mem * MinRAMPercentage) / 100); 2107 } else { 2108 // Not-small physical memory, so require a heap at least 2109 // as large as MaxHeapSize 2110 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2111 } 2112 2113 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2114 // Limit the heap size to ErgoHeapSizeLimit 2115 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2116 } 2117 if (UseCompressedOops) { 2118 // Limit the heap size to the maximum possible when using compressed oops 2119 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2120 2121 // HeapBaseMinAddress can be greater than default but not less than. 2122 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2123 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2124 // matches compressed oops printing flags 2125 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2126 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2127 DefaultHeapBaseMinAddress, 2128 DefaultHeapBaseMinAddress/G, 2129 HeapBaseMinAddress); 2130 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2131 } 2132 } 2133 2134 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2135 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2136 // but it should be not less than default MaxHeapSize. 2137 max_coop_heap -= HeapBaseMinAddress; 2138 } 2139 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2140 } 2141 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2142 2143 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2144 // An initial heap size was specified on the command line, 2145 // so be sure that the maximum size is consistent. Done 2146 // after call to limit_by_allocatable_memory because that 2147 // method might reduce the allocation size. 2148 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2149 } 2150 2151 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2152 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2153 } 2154 2155 // If the minimum or initial heap_size have not been set or requested to be set 2156 // ergonomically, set them accordingly. 2157 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2158 julong reasonable_minimum = (julong)(OldSize + NewSize); 2159 2160 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2161 2162 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2163 2164 if (InitialHeapSize == 0) { 2165 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 2166 2167 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2168 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2169 2170 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2171 2172 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2173 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2174 } 2175 // If the minimum heap size has not been set (via -Xms), 2176 // synchronize with InitialHeapSize to avoid errors with the default value. 2177 if (min_heap_size() == 0) { 2178 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2179 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2180 } 2181 } 2182 } 2183 2184 // This option inspects the machine and attempts to set various 2185 // parameters to be optimal for long-running, memory allocation 2186 // intensive jobs. It is intended for machines with large 2187 // amounts of cpu and memory. 2188 jint Arguments::set_aggressive_heap_flags() { 2189 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2190 // VM, but we may not be able to represent the total physical memory 2191 // available (like having 8gb of memory on a box but using a 32bit VM). 2192 // Thus, we need to make sure we're using a julong for intermediate 2193 // calculations. 2194 julong initHeapSize; 2195 julong total_memory = os::physical_memory(); 2196 2197 if (total_memory < (julong) 256 * M) { 2198 jio_fprintf(defaultStream::error_stream(), 2199 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2200 vm_exit(1); 2201 } 2202 2203 // The heap size is half of available memory, or (at most) 2204 // all of possible memory less 160mb (leaving room for the OS 2205 // when using ISM). This is the maximum; because adaptive sizing 2206 // is turned on below, the actual space used may be smaller. 2207 2208 initHeapSize = MIN2(total_memory / (julong) 2, 2209 total_memory - (julong) 160 * M); 2210 2211 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2212 2213 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2214 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2215 return JNI_EINVAL; 2216 } 2217 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2218 return JNI_EINVAL; 2219 } 2220 // Currently the minimum size and the initial heap sizes are the same. 2221 set_min_heap_size(initHeapSize); 2222 } 2223 if (FLAG_IS_DEFAULT(NewSize)) { 2224 // Make the young generation 3/8ths of the total heap. 2225 if (FLAG_SET_CMDLINE(size_t, NewSize, 2226 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2227 return JNI_EINVAL; 2228 } 2229 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2230 return JNI_EINVAL; 2231 } 2232 } 2233 2234 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2235 FLAG_SET_DEFAULT(UseLargePages, true); 2236 #endif 2237 2238 // Increase some data structure sizes for efficiency 2239 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2240 return JNI_EINVAL; 2241 } 2242 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2243 return JNI_EINVAL; 2244 } 2245 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2246 return JNI_EINVAL; 2247 } 2248 2249 // See the OldPLABSize comment below, but replace 'after promotion' 2250 // with 'after copying'. YoungPLABSize is the size of the survivor 2251 // space per-gc-thread buffers. The default is 4kw. 2252 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2253 return JNI_EINVAL; 2254 } 2255 2256 // OldPLABSize is the size of the buffers in the old gen that 2257 // UseParallelGC uses to promote live data that doesn't fit in the 2258 // survivor spaces. At any given time, there's one for each gc thread. 2259 // The default size is 1kw. These buffers are rarely used, since the 2260 // survivor spaces are usually big enough. For specjbb, however, there 2261 // are occasions when there's lots of live data in the young gen 2262 // and we end up promoting some of it. We don't have a definite 2263 // explanation for why bumping OldPLABSize helps, but the theory 2264 // is that a bigger PLAB results in retaining something like the 2265 // original allocation order after promotion, which improves mutator 2266 // locality. A minor effect may be that larger PLABs reduce the 2267 // number of PLAB allocation events during gc. The value of 8kw 2268 // was arrived at by experimenting with specjbb. 2269 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2270 return JNI_EINVAL; 2271 } 2272 2273 // Enable parallel GC and adaptive generation sizing 2274 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2275 return JNI_EINVAL; 2276 } 2277 2278 // Encourage steady state memory management 2279 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2280 return JNI_EINVAL; 2281 } 2282 2283 // This appears to improve mutator locality 2284 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2285 return JNI_EINVAL; 2286 } 2287 2288 // Get around early Solaris scheduling bug 2289 // (affinity vs other jobs on system) 2290 // but disallow DR and offlining (5008695). 2291 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2292 return JNI_EINVAL; 2293 } 2294 2295 return JNI_OK; 2296 } 2297 2298 // This must be called after ergonomics. 2299 void Arguments::set_bytecode_flags() { 2300 if (!RewriteBytecodes) { 2301 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2302 } 2303 } 2304 2305 // Aggressive optimization flags -XX:+AggressiveOpts 2306 jint Arguments::set_aggressive_opts_flags() { 2307 #ifdef COMPILER2 2308 if (AggressiveUnboxing) { 2309 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2310 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2311 } else if (!EliminateAutoBox) { 2312 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2313 AggressiveUnboxing = false; 2314 } 2315 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2316 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2317 } else if (!DoEscapeAnalysis) { 2318 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2319 AggressiveUnboxing = false; 2320 } 2321 } 2322 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2323 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2324 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2325 } 2326 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2327 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2328 } 2329 2330 // Feed the cache size setting into the JDK 2331 char buffer[1024]; 2332 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2333 if (!add_property(buffer)) { 2334 return JNI_ENOMEM; 2335 } 2336 } 2337 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2338 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2339 } 2340 #endif 2341 2342 if (AggressiveOpts) { 2343 // Sample flag setting code 2344 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2345 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2346 // } 2347 } 2348 2349 return JNI_OK; 2350 } 2351 2352 //=========================================================================================================== 2353 // Parsing of java.compiler property 2354 2355 void Arguments::process_java_compiler_argument(const char* arg) { 2356 // For backwards compatibility, Djava.compiler=NONE or "" 2357 // causes us to switch to -Xint mode UNLESS -Xdebug 2358 // is also specified. 2359 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2360 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2361 } 2362 } 2363 2364 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2365 _sun_java_launcher = os::strdup_check_oom(launcher); 2366 } 2367 2368 bool Arguments::created_by_java_launcher() { 2369 assert(_sun_java_launcher != NULL, "property must have value"); 2370 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2371 } 2372 2373 bool Arguments::sun_java_launcher_is_altjvm() { 2374 return _sun_java_launcher_is_altjvm; 2375 } 2376 2377 //=========================================================================================================== 2378 // Parsing of main arguments 2379 2380 #if INCLUDE_JVMCI 2381 // Check consistency of jvmci vm argument settings. 2382 bool Arguments::check_jvmci_args_consistency() { 2383 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2384 } 2385 #endif //INCLUDE_JVMCI 2386 2387 // Check consistency of GC selection 2388 bool Arguments::check_gc_consistency() { 2389 // Ensure that the user has not selected conflicting sets 2390 // of collectors. 2391 uint i = 0; 2392 if (UseSerialGC) i++; 2393 if (UseConcMarkSweepGC) i++; 2394 if (UseParallelGC || UseParallelOldGC) i++; 2395 if (UseG1GC) i++; 2396 if (i > 1) { 2397 jio_fprintf(defaultStream::error_stream(), 2398 "Conflicting collector combinations in option list; " 2399 "please refer to the release notes for the combinations " 2400 "allowed\n"); 2401 return false; 2402 } 2403 2404 return true; 2405 } 2406 2407 // Check the consistency of vm_init_args 2408 bool Arguments::check_vm_args_consistency() { 2409 // Method for adding checks for flag consistency. 2410 // The intent is to warn the user of all possible conflicts, 2411 // before returning an error. 2412 // Note: Needs platform-dependent factoring. 2413 bool status = true; 2414 2415 if (TLABRefillWasteFraction == 0) { 2416 jio_fprintf(defaultStream::error_stream(), 2417 "TLABRefillWasteFraction should be a denominator, " 2418 "not " SIZE_FORMAT "\n", 2419 TLABRefillWasteFraction); 2420 status = false; 2421 } 2422 2423 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2424 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2425 } 2426 2427 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2428 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2429 } 2430 2431 if (GCTimeLimit == 100) { 2432 // Turn off gc-overhead-limit-exceeded checks 2433 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2434 } 2435 2436 status = status && check_gc_consistency(); 2437 2438 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2439 // insists that we hold the requisite locks so that the iteration is 2440 // MT-safe. For the verification at start-up and shut-down, we don't 2441 // yet have a good way of acquiring and releasing these locks, 2442 // which are not visible at the CollectedHeap level. We want to 2443 // be able to acquire these locks and then do the iteration rather 2444 // than just disable the lock verification. This will be fixed under 2445 // bug 4788986. 2446 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2447 if (VerifyDuringStartup) { 2448 warning("Heap verification at start-up disabled " 2449 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2450 VerifyDuringStartup = false; // Disable verification at start-up 2451 } 2452 2453 if (VerifyBeforeExit) { 2454 warning("Heap verification at shutdown disabled " 2455 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2456 VerifyBeforeExit = false; // Disable verification at shutdown 2457 } 2458 } 2459 2460 if (PrintNMTStatistics) { 2461 #if INCLUDE_NMT 2462 if (MemTracker::tracking_level() == NMT_off) { 2463 #endif // INCLUDE_NMT 2464 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2465 PrintNMTStatistics = false; 2466 #if INCLUDE_NMT 2467 } 2468 #endif 2469 } 2470 2471 #if INCLUDE_JVMCI 2472 status = status && check_jvmci_args_consistency(); 2473 2474 if (EnableJVMCI) { 2475 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2476 AddProperty, UnwriteableProperty, InternalProperty); 2477 2478 if (!ScavengeRootsInCode) { 2479 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2480 ScavengeRootsInCode = 1; 2481 } 2482 } 2483 #endif 2484 2485 // Check lower bounds of the code cache 2486 // Template Interpreter code is approximately 3X larger in debug builds. 2487 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2488 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2489 jio_fprintf(defaultStream::error_stream(), 2490 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2491 os::vm_page_size()/K); 2492 status = false; 2493 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2494 jio_fprintf(defaultStream::error_stream(), 2495 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2496 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2497 status = false; 2498 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2499 jio_fprintf(defaultStream::error_stream(), 2500 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2501 min_code_cache_size/K); 2502 status = false; 2503 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2504 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2505 jio_fprintf(defaultStream::error_stream(), 2506 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2507 CODE_CACHE_SIZE_LIMIT/M); 2508 status = false; 2509 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2512 min_code_cache_size/K); 2513 status = false; 2514 } 2515 2516 #ifdef _LP64 2517 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2518 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2519 } 2520 #endif 2521 2522 #ifndef SUPPORT_RESERVED_STACK_AREA 2523 if (StackReservedPages != 0) { 2524 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2525 warning("Reserved Stack Area not supported on this platform"); 2526 } 2527 #endif 2528 2529 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2530 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2531 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2532 } 2533 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2534 } 2535 if (UseCompiler && is_interpreter_only()) { 2536 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2537 warning("UseCompiler disabled due to -Xint."); 2538 } 2539 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2540 } 2541 #ifdef COMPILER2 2542 if (PostLoopMultiversioning && !RangeCheckElimination) { 2543 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2544 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2545 } 2546 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2547 } 2548 #endif 2549 return status; 2550 } 2551 2552 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2553 const char* option_type) { 2554 if (ignore) return false; 2555 2556 const char* spacer = " "; 2557 if (option_type == NULL) { 2558 option_type = ++spacer; // Set both to the empty string. 2559 } 2560 2561 if (os::obsolete_option(option)) { 2562 jio_fprintf(defaultStream::error_stream(), 2563 "Obsolete %s%soption: %s\n", option_type, spacer, 2564 option->optionString); 2565 return false; 2566 } else { 2567 jio_fprintf(defaultStream::error_stream(), 2568 "Unrecognized %s%soption: %s\n", option_type, spacer, 2569 option->optionString); 2570 return true; 2571 } 2572 } 2573 2574 static const char* user_assertion_options[] = { 2575 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2576 }; 2577 2578 static const char* system_assertion_options[] = { 2579 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2580 }; 2581 2582 bool Arguments::parse_uintx(const char* value, 2583 uintx* uintx_arg, 2584 uintx min_size) { 2585 2586 // Check the sign first since atojulong() parses only unsigned values. 2587 bool value_is_positive = !(*value == '-'); 2588 2589 if (value_is_positive) { 2590 julong n; 2591 bool good_return = atojulong(value, &n); 2592 if (good_return) { 2593 bool above_minimum = n >= min_size; 2594 bool value_is_too_large = n > max_uintx; 2595 2596 if (above_minimum && !value_is_too_large) { 2597 *uintx_arg = n; 2598 return true; 2599 } 2600 } 2601 } 2602 return false; 2603 } 2604 2605 unsigned int addreads_count = 0; 2606 unsigned int addexports_count = 0; 2607 unsigned int addopens_count = 0; 2608 unsigned int addmods_count = 0; 2609 unsigned int patch_mod_count = 0; 2610 2611 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2612 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2613 char* property = AllocateHeap(prop_len, mtArguments); 2614 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2615 if (ret < 0 || ret >= (int)prop_len) { 2616 FreeHeap(property); 2617 return false; 2618 } 2619 bool added = add_property(property, UnwriteableProperty, internal); 2620 FreeHeap(property); 2621 return added; 2622 } 2623 2624 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2625 const unsigned int props_count_limit = 1000; 2626 const int max_digits = 3; 2627 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2628 2629 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2630 if (count < props_count_limit) { 2631 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2632 char* property = AllocateHeap(prop_len, mtArguments); 2633 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2634 if (ret < 0 || ret >= (int)prop_len) { 2635 FreeHeap(property); 2636 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2637 return false; 2638 } 2639 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2640 FreeHeap(property); 2641 return added; 2642 } 2643 2644 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2645 return false; 2646 } 2647 2648 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2649 julong* long_arg, 2650 julong min_size, 2651 julong max_size) { 2652 if (!atojulong(s, long_arg)) return arg_unreadable; 2653 return check_memory_size(*long_arg, min_size, max_size); 2654 } 2655 2656 // Parse JavaVMInitArgs structure 2657 2658 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2659 const JavaVMInitArgs *java_options_args, 2660 const JavaVMInitArgs *cmd_line_args) { 2661 bool patch_mod_javabase = false; 2662 2663 // Save default settings for some mode flags 2664 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2665 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2666 Arguments::_ClipInlining = ClipInlining; 2667 Arguments::_BackgroundCompilation = BackgroundCompilation; 2668 if (TieredCompilation) { 2669 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2670 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2671 } 2672 2673 // Setup flags for mixed which is the default 2674 set_mode_flags(_mixed); 2675 2676 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2677 // variable (if present). 2678 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2679 if (result != JNI_OK) { 2680 return result; 2681 } 2682 2683 // Parse args structure generated from the command line flags. 2684 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2685 if (result != JNI_OK) { 2686 return result; 2687 } 2688 2689 // Parse args structure generated from the _JAVA_OPTIONS environment 2690 // variable (if present) (mimics classic VM) 2691 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2692 if (result != JNI_OK) { 2693 return result; 2694 } 2695 2696 // Do final processing now that all arguments have been parsed 2697 result = finalize_vm_init_args(patch_mod_javabase); 2698 if (result != JNI_OK) { 2699 return result; 2700 } 2701 2702 return JNI_OK; 2703 } 2704 2705 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2706 // represents a valid JDWP agent. is_path==true denotes that we 2707 // are dealing with -agentpath (case where name is a path), otherwise with 2708 // -agentlib 2709 bool valid_jdwp_agent(char *name, bool is_path) { 2710 char *_name; 2711 const char *_jdwp = "jdwp"; 2712 size_t _len_jdwp, _len_prefix; 2713 2714 if (is_path) { 2715 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2716 return false; 2717 } 2718 2719 _name++; // skip past last path separator 2720 _len_prefix = strlen(JNI_LIB_PREFIX); 2721 2722 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2723 return false; 2724 } 2725 2726 _name += _len_prefix; 2727 _len_jdwp = strlen(_jdwp); 2728 2729 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2730 _name += _len_jdwp; 2731 } 2732 else { 2733 return false; 2734 } 2735 2736 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2737 return false; 2738 } 2739 2740 return true; 2741 } 2742 2743 if (strcmp(name, _jdwp) == 0) { 2744 return true; 2745 } 2746 2747 return false; 2748 } 2749 2750 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2751 // --patch-module=<module>=<file>(<pathsep><file>)* 2752 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2753 // Find the equal sign between the module name and the path specification 2754 const char* module_equal = strchr(patch_mod_tail, '='); 2755 if (module_equal == NULL) { 2756 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2757 return JNI_ERR; 2758 } else { 2759 // Pick out the module name 2760 size_t module_len = module_equal - patch_mod_tail; 2761 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2762 if (module_name != NULL) { 2763 memcpy(module_name, patch_mod_tail, module_len); 2764 *(module_name + module_len) = '\0'; 2765 // The path piece begins one past the module_equal sign 2766 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2767 FREE_C_HEAP_ARRAY(char, module_name); 2768 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2769 return JNI_ENOMEM; 2770 } 2771 } else { 2772 return JNI_ENOMEM; 2773 } 2774 } 2775 return JNI_OK; 2776 } 2777 2778 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2779 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2780 // The min and max sizes match the values in globals.hpp, but scaled 2781 // with K. The values have been chosen so that alignment with page 2782 // size doesn't change the max value, which makes the conversions 2783 // back and forth between Xss value and ThreadStackSize value easier. 2784 // The values have also been chosen to fit inside a 32-bit signed type. 2785 const julong min_ThreadStackSize = 0; 2786 const julong max_ThreadStackSize = 1 * M; 2787 2788 const julong min_size = min_ThreadStackSize * K; 2789 const julong max_size = max_ThreadStackSize * K; 2790 2791 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2792 2793 julong size = 0; 2794 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2795 if (errcode != arg_in_range) { 2796 bool silent = (option == NULL); // Allow testing to silence error messages 2797 if (!silent) { 2798 jio_fprintf(defaultStream::error_stream(), 2799 "Invalid thread stack size: %s\n", option->optionString); 2800 describe_range_error(errcode); 2801 } 2802 return JNI_EINVAL; 2803 } 2804 2805 // Internally track ThreadStackSize in units of 1024 bytes. 2806 const julong size_aligned = align_up(size, K); 2807 assert(size <= size_aligned, 2808 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2809 size, size_aligned); 2810 2811 const julong size_in_K = size_aligned / K; 2812 assert(size_in_K < (julong)max_intx, 2813 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2814 size_in_K); 2815 2816 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2817 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2818 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2819 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2820 max_expanded, size_in_K); 2821 2822 *out_ThreadStackSize = (intx)size_in_K; 2823 2824 return JNI_OK; 2825 } 2826 2827 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2828 // For match_option to return remaining or value part of option string 2829 const char* tail; 2830 2831 // iterate over arguments 2832 for (int index = 0; index < args->nOptions; index++) { 2833 bool is_absolute_path = false; // for -agentpath vs -agentlib 2834 2835 const JavaVMOption* option = args->options + index; 2836 2837 if (!match_option(option, "-Djava.class.path", &tail) && 2838 !match_option(option, "-Dsun.java.command", &tail) && 2839 !match_option(option, "-Dsun.java.launcher", &tail)) { 2840 2841 // add all jvm options to the jvm_args string. This string 2842 // is used later to set the java.vm.args PerfData string constant. 2843 // the -Djava.class.path and the -Dsun.java.command options are 2844 // omitted from jvm_args string as each have their own PerfData 2845 // string constant object. 2846 build_jvm_args(option->optionString); 2847 } 2848 2849 // -verbose:[class/module/gc/jni] 2850 if (match_option(option, "-verbose", &tail)) { 2851 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2852 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2853 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2854 } else if (!strcmp(tail, ":module")) { 2855 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2856 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2857 } else if (!strcmp(tail, ":gc")) { 2858 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2859 } else if (!strcmp(tail, ":jni")) { 2860 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2861 return JNI_EINVAL; 2862 } 2863 } 2864 // -da / -ea / -disableassertions / -enableassertions 2865 // These accept an optional class/package name separated by a colon, e.g., 2866 // -da:java.lang.Thread. 2867 } else if (match_option(option, user_assertion_options, &tail, true)) { 2868 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2869 if (*tail == '\0') { 2870 JavaAssertions::setUserClassDefault(enable); 2871 } else { 2872 assert(*tail == ':', "bogus match by match_option()"); 2873 JavaAssertions::addOption(tail + 1, enable); 2874 } 2875 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2876 } else if (match_option(option, system_assertion_options, &tail, false)) { 2877 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2878 JavaAssertions::setSystemClassDefault(enable); 2879 // -bootclasspath: 2880 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2881 jio_fprintf(defaultStream::output_stream(), 2882 "-Xbootclasspath is no longer a supported option.\n"); 2883 return JNI_EINVAL; 2884 // -bootclasspath/a: 2885 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2886 Arguments::append_sysclasspath(tail); 2887 // -bootclasspath/p: 2888 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2889 jio_fprintf(defaultStream::output_stream(), 2890 "-Xbootclasspath/p is no longer a supported option.\n"); 2891 return JNI_EINVAL; 2892 // -Xrun 2893 } else if (match_option(option, "-Xrun", &tail)) { 2894 if (tail != NULL) { 2895 const char* pos = strchr(tail, ':'); 2896 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2897 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2898 jio_snprintf(name, len + 1, "%s", tail); 2899 2900 char *options = NULL; 2901 if(pos != NULL) { 2902 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2903 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2904 } 2905 #if !INCLUDE_JVMTI 2906 if (strcmp(name, "jdwp") == 0) { 2907 jio_fprintf(defaultStream::error_stream(), 2908 "Debugging agents are not supported in this VM\n"); 2909 return JNI_ERR; 2910 } 2911 #endif // !INCLUDE_JVMTI 2912 add_init_library(name, options); 2913 } 2914 } else if (match_option(option, "--add-reads=", &tail)) { 2915 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2916 return JNI_ENOMEM; 2917 } 2918 } else if (match_option(option, "--add-exports=", &tail)) { 2919 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2920 return JNI_ENOMEM; 2921 } 2922 } else if (match_option(option, "--add-opens=", &tail)) { 2923 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2924 return JNI_ENOMEM; 2925 } 2926 } else if (match_option(option, "--add-modules=", &tail)) { 2927 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2928 return JNI_ENOMEM; 2929 } 2930 } else if (match_option(option, "--limit-modules=", &tail)) { 2931 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2932 return JNI_ENOMEM; 2933 } 2934 } else if (match_option(option, "--module-path=", &tail)) { 2935 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2936 return JNI_ENOMEM; 2937 } 2938 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2939 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2940 return JNI_ENOMEM; 2941 } 2942 } else if (match_option(option, "--patch-module=", &tail)) { 2943 // --patch-module=<module>=<file>(<pathsep><file>)* 2944 int res = process_patch_mod_option(tail, patch_mod_javabase); 2945 if (res != JNI_OK) { 2946 return res; 2947 } 2948 } else if (match_option(option, "--illegal-access=", &tail)) { 2949 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2950 return JNI_ENOMEM; 2951 } 2952 // -agentlib and -agentpath 2953 } else if (match_option(option, "-agentlib:", &tail) || 2954 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2955 if(tail != NULL) { 2956 const char* pos = strchr(tail, '='); 2957 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2958 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2959 name[len] = '\0'; 2960 2961 char *options = NULL; 2962 if(pos != NULL) { 2963 options = os::strdup_check_oom(pos + 1, mtArguments); 2964 } 2965 #if !INCLUDE_JVMTI 2966 if (valid_jdwp_agent(name, is_absolute_path)) { 2967 jio_fprintf(defaultStream::error_stream(), 2968 "Debugging agents are not supported in this VM\n"); 2969 return JNI_ERR; 2970 } 2971 #endif // !INCLUDE_JVMTI 2972 add_init_agent(name, options, is_absolute_path); 2973 } 2974 // -javaagent 2975 } else if (match_option(option, "-javaagent:", &tail)) { 2976 #if !INCLUDE_JVMTI 2977 jio_fprintf(defaultStream::error_stream(), 2978 "Instrumentation agents are not supported in this VM\n"); 2979 return JNI_ERR; 2980 #else 2981 if (tail != NULL) { 2982 size_t length = strlen(tail) + 1; 2983 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2984 jio_snprintf(options, length, "%s", tail); 2985 add_init_agent("instrument", options, false); 2986 // java agents need module java.instrument 2987 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2988 return JNI_ENOMEM; 2989 } 2990 } 2991 #endif // !INCLUDE_JVMTI 2992 // -Xnoclassgc 2993 } else if (match_option(option, "-Xnoclassgc")) { 2994 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2995 return JNI_EINVAL; 2996 } 2997 // -Xconcgc 2998 } else if (match_option(option, "-Xconcgc")) { 2999 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 3000 return JNI_EINVAL; 3001 } 3002 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 3003 // -Xnoconcgc 3004 } else if (match_option(option, "-Xnoconcgc")) { 3005 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 3006 return JNI_EINVAL; 3007 } 3008 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 3009 // -Xbatch 3010 } else if (match_option(option, "-Xbatch")) { 3011 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3012 return JNI_EINVAL; 3013 } 3014 // -Xmn for compatibility with other JVM vendors 3015 } else if (match_option(option, "-Xmn", &tail)) { 3016 julong long_initial_young_size = 0; 3017 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 3018 if (errcode != arg_in_range) { 3019 jio_fprintf(defaultStream::error_stream(), 3020 "Invalid initial young generation size: %s\n", option->optionString); 3021 describe_range_error(errcode); 3022 return JNI_EINVAL; 3023 } 3024 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 3025 return JNI_EINVAL; 3026 } 3027 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 3028 return JNI_EINVAL; 3029 } 3030 // -Xms 3031 } else if (match_option(option, "-Xms", &tail)) { 3032 julong long_initial_heap_size = 0; 3033 // an initial heap size of 0 means automatically determine 3034 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 3035 if (errcode != arg_in_range) { 3036 jio_fprintf(defaultStream::error_stream(), 3037 "Invalid initial heap size: %s\n", option->optionString); 3038 describe_range_error(errcode); 3039 return JNI_EINVAL; 3040 } 3041 set_min_heap_size((size_t)long_initial_heap_size); 3042 // Currently the minimum size and the initial heap sizes are the same. 3043 // Can be overridden with -XX:InitialHeapSize. 3044 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 3045 return JNI_EINVAL; 3046 } 3047 // -Xmx 3048 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 3049 julong long_max_heap_size = 0; 3050 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 3051 if (errcode != arg_in_range) { 3052 jio_fprintf(defaultStream::error_stream(), 3053 "Invalid maximum heap size: %s\n", option->optionString); 3054 describe_range_error(errcode); 3055 return JNI_EINVAL; 3056 } 3057 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 3058 return JNI_EINVAL; 3059 } 3060 // Xmaxf 3061 } else if (match_option(option, "-Xmaxf", &tail)) { 3062 char* err; 3063 int maxf = (int)(strtod(tail, &err) * 100); 3064 if (*err != '\0' || *tail == '\0') { 3065 jio_fprintf(defaultStream::error_stream(), 3066 "Bad max heap free percentage size: %s\n", 3067 option->optionString); 3068 return JNI_EINVAL; 3069 } else { 3070 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 3071 return JNI_EINVAL; 3072 } 3073 } 3074 // Xminf 3075 } else if (match_option(option, "-Xminf", &tail)) { 3076 char* err; 3077 int minf = (int)(strtod(tail, &err) * 100); 3078 if (*err != '\0' || *tail == '\0') { 3079 jio_fprintf(defaultStream::error_stream(), 3080 "Bad min heap free percentage size: %s\n", 3081 option->optionString); 3082 return JNI_EINVAL; 3083 } else { 3084 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3085 return JNI_EINVAL; 3086 } 3087 } 3088 // -Xss 3089 } else if (match_option(option, "-Xss", &tail)) { 3090 intx value = 0; 3091 jint err = parse_xss(option, tail, &value); 3092 if (err != JNI_OK) { 3093 return err; 3094 } 3095 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) { 3096 return JNI_EINVAL; 3097 } 3098 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3099 julong long_CodeCacheExpansionSize = 0; 3100 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3101 if (errcode != arg_in_range) { 3102 jio_fprintf(defaultStream::error_stream(), 3103 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3104 os::vm_page_size()/K); 3105 return JNI_EINVAL; 3106 } 3107 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3108 return JNI_EINVAL; 3109 } 3110 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3111 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3112 julong long_ReservedCodeCacheSize = 0; 3113 3114 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3115 if (errcode != arg_in_range) { 3116 jio_fprintf(defaultStream::error_stream(), 3117 "Invalid maximum code cache size: %s.\n", option->optionString); 3118 return JNI_EINVAL; 3119 } 3120 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3121 return JNI_EINVAL; 3122 } 3123 // -XX:NonNMethodCodeHeapSize= 3124 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3125 julong long_NonNMethodCodeHeapSize = 0; 3126 3127 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3128 if (errcode != arg_in_range) { 3129 jio_fprintf(defaultStream::error_stream(), 3130 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3131 return JNI_EINVAL; 3132 } 3133 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3134 return JNI_EINVAL; 3135 } 3136 // -XX:ProfiledCodeHeapSize= 3137 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3138 julong long_ProfiledCodeHeapSize = 0; 3139 3140 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3141 if (errcode != arg_in_range) { 3142 jio_fprintf(defaultStream::error_stream(), 3143 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3144 return JNI_EINVAL; 3145 } 3146 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3147 return JNI_EINVAL; 3148 } 3149 // -XX:NonProfiledCodeHeapSizee= 3150 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3151 julong long_NonProfiledCodeHeapSize = 0; 3152 3153 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3154 if (errcode != arg_in_range) { 3155 jio_fprintf(defaultStream::error_stream(), 3156 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3157 return JNI_EINVAL; 3158 } 3159 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3160 return JNI_EINVAL; 3161 } 3162 // -green 3163 } else if (match_option(option, "-green")) { 3164 jio_fprintf(defaultStream::error_stream(), 3165 "Green threads support not available\n"); 3166 return JNI_EINVAL; 3167 // -native 3168 } else if (match_option(option, "-native")) { 3169 // HotSpot always uses native threads, ignore silently for compatibility 3170 // -Xrs 3171 } else if (match_option(option, "-Xrs")) { 3172 // Classic/EVM option, new functionality 3173 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3174 return JNI_EINVAL; 3175 } 3176 // -Xprof 3177 } else if (match_option(option, "-Xprof")) { 3178 char version[256]; 3179 // Obsolete in JDK 10 3180 JDK_Version::jdk(10).to_string(version, sizeof(version)); 3181 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3182 // -Xconcurrentio 3183 } else if (match_option(option, "-Xconcurrentio")) { 3184 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3185 return JNI_EINVAL; 3186 } 3187 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3188 return JNI_EINVAL; 3189 } 3190 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3191 return JNI_EINVAL; 3192 } 3193 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3194 return JNI_EINVAL; 3195 } 3196 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3197 return JNI_EINVAL; 3198 } 3199 3200 // -Xinternalversion 3201 } else if (match_option(option, "-Xinternalversion")) { 3202 jio_fprintf(defaultStream::output_stream(), "%s\n", 3203 VM_Version::internal_vm_info_string()); 3204 vm_exit(0); 3205 #ifndef PRODUCT 3206 // -Xprintflags 3207 } else if (match_option(option, "-Xprintflags")) { 3208 CommandLineFlags::printFlags(tty, false); 3209 vm_exit(0); 3210 #endif 3211 // -D 3212 } else if (match_option(option, "-D", &tail)) { 3213 const char* value; 3214 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3215 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3216 // abort if -Djava.endorsed.dirs is set 3217 jio_fprintf(defaultStream::output_stream(), 3218 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3219 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3220 return JNI_EINVAL; 3221 } 3222 if (match_option(option, "-Djava.ext.dirs=", &value) && 3223 *value != '\0' && strcmp(value, "\"\"") != 0) { 3224 // abort if -Djava.ext.dirs is set 3225 jio_fprintf(defaultStream::output_stream(), 3226 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3227 return JNI_EINVAL; 3228 } 3229 // Check for module related properties. They must be set using the modules 3230 // options. For example: use "--add-modules=java.sql", not 3231 // "-Djdk.module.addmods=java.sql" 3232 if (is_internal_module_property(option->optionString + 2)) { 3233 needs_module_property_warning = true; 3234 continue; 3235 } 3236 3237 if (!add_property(tail)) { 3238 return JNI_ENOMEM; 3239 } 3240 // Out of the box management support 3241 if (match_option(option, "-Dcom.sun.management", &tail)) { 3242 #if INCLUDE_MANAGEMENT 3243 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3244 return JNI_EINVAL; 3245 } 3246 // management agent in module jdk.management.agent 3247 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3248 return JNI_ENOMEM; 3249 } 3250 #else 3251 jio_fprintf(defaultStream::output_stream(), 3252 "-Dcom.sun.management is not supported in this VM.\n"); 3253 return JNI_ERR; 3254 #endif 3255 } 3256 // -Xint 3257 } else if (match_option(option, "-Xint")) { 3258 set_mode_flags(_int); 3259 // -Xmixed 3260 } else if (match_option(option, "-Xmixed")) { 3261 set_mode_flags(_mixed); 3262 // -Xcomp 3263 } else if (match_option(option, "-Xcomp")) { 3264 // for testing the compiler; turn off all flags that inhibit compilation 3265 set_mode_flags(_comp); 3266 // -Xshare:dump 3267 } else if (match_option(option, "-Xshare:dump")) { 3268 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3269 return JNI_EINVAL; 3270 } 3271 set_mode_flags(_int); // Prevent compilation, which creates objects 3272 // -Xshare:on 3273 } else if (match_option(option, "-Xshare:on")) { 3274 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3275 return JNI_EINVAL; 3276 } 3277 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3278 return JNI_EINVAL; 3279 } 3280 // -Xshare:auto 3281 } else if (match_option(option, "-Xshare:auto")) { 3282 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3283 return JNI_EINVAL; 3284 } 3285 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3286 return JNI_EINVAL; 3287 } 3288 // -Xshare:off 3289 } else if (match_option(option, "-Xshare:off")) { 3290 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3291 return JNI_EINVAL; 3292 } 3293 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3294 return JNI_EINVAL; 3295 } 3296 // -Xverify 3297 } else if (match_option(option, "-Xverify", &tail)) { 3298 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3299 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3300 return JNI_EINVAL; 3301 } 3302 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3303 return JNI_EINVAL; 3304 } 3305 } else if (strcmp(tail, ":remote") == 0) { 3306 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3307 return JNI_EINVAL; 3308 } 3309 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3310 return JNI_EINVAL; 3311 } 3312 } else if (strcmp(tail, ":none") == 0) { 3313 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3314 return JNI_EINVAL; 3315 } 3316 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3317 return JNI_EINVAL; 3318 } 3319 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3320 return JNI_EINVAL; 3321 } 3322 // -Xdebug 3323 } else if (match_option(option, "-Xdebug")) { 3324 // note this flag has been used, then ignore 3325 set_xdebug_mode(true); 3326 // -Xnoagent 3327 } else if (match_option(option, "-Xnoagent")) { 3328 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3329 } else if (match_option(option, "-Xloggc:", &tail)) { 3330 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3331 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3332 _gc_log_filename = os::strdup_check_oom(tail); 3333 } else if (match_option(option, "-Xlog", &tail)) { 3334 bool ret = false; 3335 if (strcmp(tail, ":help") == 0) { 3336 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3337 vm_exit(0); 3338 } else if (strcmp(tail, ":disable") == 0) { 3339 LogConfiguration::disable_logging(); 3340 ret = true; 3341 } else if (*tail == '\0') { 3342 ret = LogConfiguration::parse_command_line_arguments(); 3343 assert(ret, "-Xlog without arguments should never fail to parse"); 3344 } else if (*tail == ':') { 3345 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3346 } 3347 if (ret == false) { 3348 jio_fprintf(defaultStream::error_stream(), 3349 "Invalid -Xlog option '-Xlog%s'\n", 3350 tail); 3351 return JNI_EINVAL; 3352 } 3353 // JNI hooks 3354 } else if (match_option(option, "-Xcheck", &tail)) { 3355 if (!strcmp(tail, ":jni")) { 3356 #if !INCLUDE_JNI_CHECK 3357 warning("JNI CHECKING is not supported in this VM"); 3358 #else 3359 CheckJNICalls = true; 3360 #endif // INCLUDE_JNI_CHECK 3361 } else if (is_bad_option(option, args->ignoreUnrecognized, 3362 "check")) { 3363 return JNI_EINVAL; 3364 } 3365 } else if (match_option(option, "vfprintf")) { 3366 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3367 } else if (match_option(option, "exit")) { 3368 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3369 } else if (match_option(option, "abort")) { 3370 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3371 // -XX:+AggressiveHeap 3372 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3373 jint result = set_aggressive_heap_flags(); 3374 if (result != JNI_OK) { 3375 return result; 3376 } 3377 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3378 // and the last option wins. 3379 } else if (match_option(option, "-XX:+NeverTenure")) { 3380 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3381 return JNI_EINVAL; 3382 } 3383 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3384 return JNI_EINVAL; 3385 } 3386 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3387 return JNI_EINVAL; 3388 } 3389 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3390 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3391 return JNI_EINVAL; 3392 } 3393 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3394 return JNI_EINVAL; 3395 } 3396 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3397 return JNI_EINVAL; 3398 } 3399 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3400 uintx max_tenuring_thresh = 0; 3401 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3402 jio_fprintf(defaultStream::error_stream(), 3403 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3404 return JNI_EINVAL; 3405 } 3406 3407 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3408 return JNI_EINVAL; 3409 } 3410 3411 if (MaxTenuringThreshold == 0) { 3412 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3413 return JNI_EINVAL; 3414 } 3415 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3416 return JNI_EINVAL; 3417 } 3418 } else { 3419 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3420 return JNI_EINVAL; 3421 } 3422 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3423 return JNI_EINVAL; 3424 } 3425 } 3426 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3427 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3428 return JNI_EINVAL; 3429 } 3430 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3431 return JNI_EINVAL; 3432 } 3433 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3434 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3435 return JNI_EINVAL; 3436 } 3437 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3438 return JNI_EINVAL; 3439 } 3440 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3441 #if defined(DTRACE_ENABLED) 3442 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3443 return JNI_EINVAL; 3444 } 3445 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3446 return JNI_EINVAL; 3447 } 3448 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3449 return JNI_EINVAL; 3450 } 3451 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3452 return JNI_EINVAL; 3453 } 3454 #else // defined(DTRACE_ENABLED) 3455 jio_fprintf(defaultStream::error_stream(), 3456 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3457 return JNI_EINVAL; 3458 #endif // defined(DTRACE_ENABLED) 3459 #ifdef ASSERT 3460 } else if (match_option(option, "-XX:+FullGCALot")) { 3461 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3462 return JNI_EINVAL; 3463 } 3464 // disable scavenge before parallel mark-compact 3465 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3466 return JNI_EINVAL; 3467 } 3468 #endif 3469 #if !INCLUDE_MANAGEMENT 3470 } else if (match_option(option, "-XX:+ManagementServer")) { 3471 jio_fprintf(defaultStream::error_stream(), 3472 "ManagementServer is not supported in this VM.\n"); 3473 return JNI_ERR; 3474 #endif // INCLUDE_MANAGEMENT 3475 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3476 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3477 // already been handled 3478 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3479 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3480 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3481 return JNI_EINVAL; 3482 } 3483 } 3484 // Unknown option 3485 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3486 return JNI_ERR; 3487 } 3488 } 3489 3490 // PrintSharedArchiveAndExit will turn on 3491 // -Xshare:on 3492 // -Xlog:class+path=info 3493 if (PrintSharedArchiveAndExit) { 3494 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3495 return JNI_EINVAL; 3496 } 3497 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3498 return JNI_EINVAL; 3499 } 3500 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3501 } 3502 3503 // Change the default value for flags which have different default values 3504 // when working with older JDKs. 3505 #ifdef LINUX 3506 if (JDK_Version::current().compare_major(6) <= 0 && 3507 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3508 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3509 } 3510 #endif // LINUX 3511 fix_appclasspath(); 3512 return JNI_OK; 3513 } 3514 3515 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3516 // For java.base check for duplicate --patch-module options being specified on the command line. 3517 // This check is only required for java.base, all other duplicate module specifications 3518 // will be checked during module system initialization. The module system initialization 3519 // will throw an ExceptionInInitializerError if this situation occurs. 3520 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3521 if (*patch_mod_javabase) { 3522 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3523 } else { 3524 *patch_mod_javabase = true; 3525 } 3526 } 3527 3528 // Create GrowableArray lazily, only if --patch-module has been specified 3529 if (_patch_mod_prefix == NULL) { 3530 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3531 } 3532 3533 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3534 } 3535 3536 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3537 // 3538 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3539 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3540 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3541 // path is treated as the current directory. 3542 // 3543 // This causes problems with CDS, which requires that all directories specified in the classpath 3544 // must be empty. In most cases, applications do NOT want to load classes from the current 3545 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3546 // scripts compatible with CDS. 3547 void Arguments::fix_appclasspath() { 3548 if (IgnoreEmptyClassPaths) { 3549 const char separator = *os::path_separator(); 3550 const char* src = _java_class_path->value(); 3551 3552 // skip over all the leading empty paths 3553 while (*src == separator) { 3554 src ++; 3555 } 3556 3557 char* copy = os::strdup_check_oom(src, mtArguments); 3558 3559 // trim all trailing empty paths 3560 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3561 *tail = '\0'; 3562 } 3563 3564 char from[3] = {separator, separator, '\0'}; 3565 char to [2] = {separator, '\0'}; 3566 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3567 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3568 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3569 } 3570 3571 _java_class_path->set_writeable_value(copy); 3572 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3573 } 3574 } 3575 3576 static bool has_jar_files(const char* directory) { 3577 DIR* dir = os::opendir(directory); 3578 if (dir == NULL) return false; 3579 3580 struct dirent *entry; 3581 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3582 bool hasJarFile = false; 3583 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3584 const char* name = entry->d_name; 3585 const char* ext = name + strlen(name) - 4; 3586 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3587 } 3588 FREE_C_HEAP_ARRAY(char, dbuf); 3589 os::closedir(dir); 3590 return hasJarFile ; 3591 } 3592 3593 static int check_non_empty_dirs(const char* path) { 3594 const char separator = *os::path_separator(); 3595 const char* const end = path + strlen(path); 3596 int nonEmptyDirs = 0; 3597 while (path < end) { 3598 const char* tmp_end = strchr(path, separator); 3599 if (tmp_end == NULL) { 3600 if (has_jar_files(path)) { 3601 nonEmptyDirs++; 3602 jio_fprintf(defaultStream::output_stream(), 3603 "Non-empty directory: %s\n", path); 3604 } 3605 path = end; 3606 } else { 3607 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3608 memcpy(dirpath, path, tmp_end - path); 3609 dirpath[tmp_end - path] = '\0'; 3610 if (has_jar_files(dirpath)) { 3611 nonEmptyDirs++; 3612 jio_fprintf(defaultStream::output_stream(), 3613 "Non-empty directory: %s\n", dirpath); 3614 } 3615 FREE_C_HEAP_ARRAY(char, dirpath); 3616 path = tmp_end + 1; 3617 } 3618 } 3619 return nonEmptyDirs; 3620 } 3621 3622 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3623 // check if the default lib/endorsed directory exists; if so, error 3624 char path[JVM_MAXPATHLEN]; 3625 const char* fileSep = os::file_separator(); 3626 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3627 3628 if (CheckEndorsedAndExtDirs) { 3629 int nonEmptyDirs = 0; 3630 // check endorsed directory 3631 nonEmptyDirs += check_non_empty_dirs(path); 3632 // check the extension directories 3633 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3634 if (nonEmptyDirs > 0) { 3635 return JNI_ERR; 3636 } 3637 } 3638 3639 DIR* dir = os::opendir(path); 3640 if (dir != NULL) { 3641 jio_fprintf(defaultStream::output_stream(), 3642 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3643 "in modular form will be supported via the concept of upgradeable modules.\n"); 3644 os::closedir(dir); 3645 return JNI_ERR; 3646 } 3647 3648 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3649 dir = os::opendir(path); 3650 if (dir != NULL) { 3651 jio_fprintf(defaultStream::output_stream(), 3652 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3653 "Use -classpath instead.\n."); 3654 os::closedir(dir); 3655 return JNI_ERR; 3656 } 3657 3658 // This must be done after all arguments have been processed. 3659 // java_compiler() true means set to "NONE" or empty. 3660 if (java_compiler() && !xdebug_mode()) { 3661 // For backwards compatibility, we switch to interpreted mode if 3662 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3663 // not specified. 3664 set_mode_flags(_int); 3665 } 3666 3667 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3668 // but like -Xint, leave compilation thresholds unaffected. 3669 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3670 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3671 set_mode_flags(_int); 3672 } 3673 3674 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3675 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3676 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3677 } 3678 3679 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3680 // Don't degrade server performance for footprint 3681 if (FLAG_IS_DEFAULT(UseLargePages) && 3682 MaxHeapSize < LargePageHeapSizeThreshold) { 3683 // No need for large granularity pages w/small heaps. 3684 // Note that large pages are enabled/disabled for both the 3685 // Java heap and the code cache. 3686 FLAG_SET_DEFAULT(UseLargePages, false); 3687 } 3688 3689 #elif defined(COMPILER2) 3690 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3691 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3692 } 3693 #endif 3694 3695 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3696 UNSUPPORTED_OPTION(ProfileInterpreter); 3697 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3698 #endif 3699 3700 #ifndef TIERED 3701 // Tiered compilation is undefined. 3702 UNSUPPORTED_OPTION(TieredCompilation); 3703 #endif 3704 3705 #if INCLUDE_JVMCI 3706 if (EnableJVMCI && 3707 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3708 return JNI_ENOMEM; 3709 } 3710 #endif 3711 3712 // If we are running in a headless jre, force java.awt.headless property 3713 // to be true unless the property has already been set. 3714 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3715 if (os::is_headless_jre()) { 3716 const char* headless = Arguments::get_property("java.awt.headless"); 3717 if (headless == NULL) { 3718 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3719 if (headless_env == NULL) { 3720 if (!add_property("java.awt.headless=true")) { 3721 return JNI_ENOMEM; 3722 } 3723 } else { 3724 char buffer[256]; 3725 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3726 if (!add_property(buffer)) { 3727 return JNI_ENOMEM; 3728 } 3729 } 3730 } 3731 } 3732 3733 if (!check_vm_args_consistency()) { 3734 return JNI_ERR; 3735 } 3736 3737 #if INCLUDE_JVMCI 3738 if (UseJVMCICompiler) { 3739 Compilation_mode = CompMode_server; 3740 } 3741 #endif 3742 3743 #if INCLUDE_CDS 3744 if (DumpSharedSpaces) { 3745 // Disable biased locking now as it interferes with the clean up of 3746 // the archived Klasses and Java string objects (at dump time only). 3747 UseBiasedLocking = false; 3748 } 3749 if (UseSharedSpaces && patch_mod_javabase) { 3750 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3751 } 3752 #endif 3753 3754 return JNI_OK; 3755 } 3756 3757 // Helper class for controlling the lifetime of JavaVMInitArgs 3758 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3759 // deleted on the destruction of the ScopedVMInitArgs object. 3760 class ScopedVMInitArgs : public StackObj { 3761 private: 3762 JavaVMInitArgs _args; 3763 char* _container_name; 3764 bool _is_set; 3765 char* _vm_options_file_arg; 3766 3767 public: 3768 ScopedVMInitArgs(const char *container_name) { 3769 _args.version = JNI_VERSION_1_2; 3770 _args.nOptions = 0; 3771 _args.options = NULL; 3772 _args.ignoreUnrecognized = false; 3773 _container_name = (char *)container_name; 3774 _is_set = false; 3775 _vm_options_file_arg = NULL; 3776 } 3777 3778 // Populates the JavaVMInitArgs object represented by this 3779 // ScopedVMInitArgs object with the arguments in options. The 3780 // allocated memory is deleted by the destructor. If this method 3781 // returns anything other than JNI_OK, then this object is in a 3782 // partially constructed state, and should be abandoned. 3783 jint set_args(GrowableArray<JavaVMOption>* options) { 3784 _is_set = true; 3785 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3786 JavaVMOption, options->length(), mtArguments); 3787 if (options_arr == NULL) { 3788 return JNI_ENOMEM; 3789 } 3790 _args.options = options_arr; 3791 3792 for (int i = 0; i < options->length(); i++) { 3793 options_arr[i] = options->at(i); 3794 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3795 if (options_arr[i].optionString == NULL) { 3796 // Rely on the destructor to do cleanup. 3797 _args.nOptions = i; 3798 return JNI_ENOMEM; 3799 } 3800 } 3801 3802 _args.nOptions = options->length(); 3803 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3804 return JNI_OK; 3805 } 3806 3807 JavaVMInitArgs* get() { return &_args; } 3808 char* container_name() { return _container_name; } 3809 bool is_set() { return _is_set; } 3810 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3811 char* vm_options_file_arg() { return _vm_options_file_arg; } 3812 3813 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3814 if (_vm_options_file_arg != NULL) { 3815 os::free(_vm_options_file_arg); 3816 } 3817 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3818 } 3819 3820 ~ScopedVMInitArgs() { 3821 if (_vm_options_file_arg != NULL) { 3822 os::free(_vm_options_file_arg); 3823 } 3824 if (_args.options == NULL) return; 3825 for (int i = 0; i < _args.nOptions; i++) { 3826 os::free(_args.options[i].optionString); 3827 } 3828 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3829 } 3830 3831 // Insert options into this option list, to replace option at 3832 // vm_options_file_pos (-XX:VMOptionsFile) 3833 jint insert(const JavaVMInitArgs* args, 3834 const JavaVMInitArgs* args_to_insert, 3835 const int vm_options_file_pos) { 3836 assert(_args.options == NULL, "shouldn't be set yet"); 3837 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3838 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3839 3840 int length = args->nOptions + args_to_insert->nOptions - 1; 3841 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3842 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3843 for (int i = 0; i < args->nOptions; i++) { 3844 if (i == vm_options_file_pos) { 3845 // insert the new options starting at the same place as the 3846 // -XX:VMOptionsFile option 3847 for (int j = 0; j < args_to_insert->nOptions; j++) { 3848 options->push(args_to_insert->options[j]); 3849 } 3850 } else { 3851 options->push(args->options[i]); 3852 } 3853 } 3854 // make into options array 3855 jint result = set_args(options); 3856 delete options; 3857 return result; 3858 } 3859 }; 3860 3861 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3862 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3863 } 3864 3865 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3866 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3867 } 3868 3869 jint Arguments::parse_options_environment_variable(const char* name, 3870 ScopedVMInitArgs* vm_args) { 3871 char *buffer = ::getenv(name); 3872 3873 // Don't check this environment variable if user has special privileges 3874 // (e.g. unix su command). 3875 if (buffer == NULL || os::have_special_privileges()) { 3876 return JNI_OK; 3877 } 3878 3879 if ((buffer = os::strdup(buffer)) == NULL) { 3880 return JNI_ENOMEM; 3881 } 3882 3883 jio_fprintf(defaultStream::error_stream(), 3884 "Picked up %s: %s\n", name, buffer); 3885 3886 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3887 3888 os::free(buffer); 3889 return retcode; 3890 } 3891 3892 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3893 // read file into buffer 3894 int fd = ::open(file_name, O_RDONLY); 3895 if (fd < 0) { 3896 jio_fprintf(defaultStream::error_stream(), 3897 "Could not open options file '%s'\n", 3898 file_name); 3899 return JNI_ERR; 3900 } 3901 3902 struct stat stbuf; 3903 int retcode = os::stat(file_name, &stbuf); 3904 if (retcode != 0) { 3905 jio_fprintf(defaultStream::error_stream(), 3906 "Could not stat options file '%s'\n", 3907 file_name); 3908 os::close(fd); 3909 return JNI_ERR; 3910 } 3911 3912 if (stbuf.st_size == 0) { 3913 // tell caller there is no option data and that is ok 3914 os::close(fd); 3915 return JNI_OK; 3916 } 3917 3918 // '+ 1' for NULL termination even with max bytes 3919 size_t bytes_alloc = stbuf.st_size + 1; 3920 3921 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3922 if (NULL == buf) { 3923 jio_fprintf(defaultStream::error_stream(), 3924 "Could not allocate read buffer for options file parse\n"); 3925 os::close(fd); 3926 return JNI_ENOMEM; 3927 } 3928 3929 memset(buf, 0, bytes_alloc); 3930 3931 // Fill buffer 3932 // Use ::read() instead of os::read because os::read() 3933 // might do a thread state transition 3934 // and it is too early for that here 3935 3936 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3937 os::close(fd); 3938 if (bytes_read < 0) { 3939 FREE_C_HEAP_ARRAY(char, buf); 3940 jio_fprintf(defaultStream::error_stream(), 3941 "Could not read options file '%s'\n", file_name); 3942 return JNI_ERR; 3943 } 3944 3945 if (bytes_read == 0) { 3946 // tell caller there is no option data and that is ok 3947 FREE_C_HEAP_ARRAY(char, buf); 3948 return JNI_OK; 3949 } 3950 3951 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3952 3953 FREE_C_HEAP_ARRAY(char, buf); 3954 return retcode; 3955 } 3956 3957 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3958 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3959 3960 // some pointers to help with parsing 3961 char *buffer_end = buffer + buf_len; 3962 char *opt_hd = buffer; 3963 char *wrt = buffer; 3964 char *rd = buffer; 3965 3966 // parse all options 3967 while (rd < buffer_end) { 3968 // skip leading white space from the input string 3969 while (rd < buffer_end && isspace(*rd)) { 3970 rd++; 3971 } 3972 3973 if (rd >= buffer_end) { 3974 break; 3975 } 3976 3977 // Remember this is where we found the head of the token. 3978 opt_hd = wrt; 3979 3980 // Tokens are strings of non white space characters separated 3981 // by one or more white spaces. 3982 while (rd < buffer_end && !isspace(*rd)) { 3983 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3984 int quote = *rd; // matching quote to look for 3985 rd++; // don't copy open quote 3986 while (rd < buffer_end && *rd != quote) { 3987 // include everything (even spaces) 3988 // up until the close quote 3989 *wrt++ = *rd++; // copy to option string 3990 } 3991 3992 if (rd < buffer_end) { 3993 rd++; // don't copy close quote 3994 } else { 3995 // did not see closing quote 3996 jio_fprintf(defaultStream::error_stream(), 3997 "Unmatched quote in %s\n", name); 3998 delete options; 3999 return JNI_ERR; 4000 } 4001 } else { 4002 *wrt++ = *rd++; // copy to option string 4003 } 4004 } 4005 4006 // steal a white space character and set it to NULL 4007 *wrt++ = '\0'; 4008 // We now have a complete token 4009 4010 JavaVMOption option; 4011 option.optionString = opt_hd; 4012 option.extraInfo = NULL; 4013 4014 options->append(option); // Fill in option 4015 4016 rd++; // Advance to next character 4017 } 4018 4019 // Fill out JavaVMInitArgs structure. 4020 jint status = vm_args->set_args(options); 4021 4022 delete options; 4023 return status; 4024 } 4025 4026 void Arguments::set_shared_spaces_flags() { 4027 if (DumpSharedSpaces) { 4028 if (FailOverToOldVerifier) { 4029 // Don't fall back to the old verifier on verification failure. If a 4030 // class fails verification with the split verifier, it might fail the 4031 // CDS runtime verifier constraint check. In that case, we don't want 4032 // to share the class. We only archive classes that pass the split verifier. 4033 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 4034 } 4035 4036 if (RequireSharedSpaces) { 4037 warning("Cannot dump shared archive while using shared archive"); 4038 } 4039 UseSharedSpaces = false; 4040 #ifdef _LP64 4041 if (!UseCompressedOops || !UseCompressedClassPointers) { 4042 vm_exit_during_initialization( 4043 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 4044 } 4045 } else { 4046 if (!UseCompressedOops || !UseCompressedClassPointers) { 4047 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 4048 } 4049 #endif 4050 } 4051 } 4052 4053 // Sharing support 4054 // Construct the path to the archive 4055 static char* get_shared_archive_path() { 4056 char *shared_archive_path; 4057 if (SharedArchiveFile == NULL) { 4058 char jvm_path[JVM_MAXPATHLEN]; 4059 os::jvm_path(jvm_path, sizeof(jvm_path)); 4060 char *end = strrchr(jvm_path, *os::file_separator()); 4061 if (end != NULL) *end = '\0'; 4062 size_t jvm_path_len = strlen(jvm_path); 4063 size_t file_sep_len = strlen(os::file_separator()); 4064 const size_t len = jvm_path_len + file_sep_len + 20; 4065 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 4066 if (shared_archive_path != NULL) { 4067 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 4068 jvm_path, os::file_separator()); 4069 } 4070 } else { 4071 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 4072 } 4073 return shared_archive_path; 4074 } 4075 4076 #ifndef PRODUCT 4077 // Determine whether LogVMOutput should be implicitly turned on. 4078 static bool use_vm_log() { 4079 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4080 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4081 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4082 PrintAssembly || TraceDeoptimization || TraceDependencies || 4083 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4084 return true; 4085 } 4086 4087 #ifdef COMPILER1 4088 if (PrintC1Statistics) { 4089 return true; 4090 } 4091 #endif // COMPILER1 4092 4093 #ifdef COMPILER2 4094 if (PrintOptoAssembly || PrintOptoStatistics) { 4095 return true; 4096 } 4097 #endif // COMPILER2 4098 4099 return false; 4100 } 4101 4102 #endif // PRODUCT 4103 4104 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4105 for (int index = 0; index < args->nOptions; index++) { 4106 const JavaVMOption* option = args->options + index; 4107 const char* tail; 4108 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4109 return true; 4110 } 4111 } 4112 return false; 4113 } 4114 4115 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4116 const char* vm_options_file, 4117 const int vm_options_file_pos, 4118 ScopedVMInitArgs* vm_options_file_args, 4119 ScopedVMInitArgs* args_out) { 4120 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4121 if (code != JNI_OK) { 4122 return code; 4123 } 4124 4125 if (vm_options_file_args->get()->nOptions < 1) { 4126 return JNI_OK; 4127 } 4128 4129 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4130 jio_fprintf(defaultStream::error_stream(), 4131 "A VM options file may not refer to a VM options file. " 4132 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4133 "options file '%s' in options container '%s' is an error.\n", 4134 vm_options_file_args->vm_options_file_arg(), 4135 vm_options_file_args->container_name()); 4136 return JNI_EINVAL; 4137 } 4138 4139 return args_out->insert(args, vm_options_file_args->get(), 4140 vm_options_file_pos); 4141 } 4142 4143 // Expand -XX:VMOptionsFile found in args_in as needed. 4144 // mod_args and args_out parameters may return values as needed. 4145 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4146 ScopedVMInitArgs* mod_args, 4147 JavaVMInitArgs** args_out) { 4148 jint code = match_special_option_and_act(args_in, mod_args); 4149 if (code != JNI_OK) { 4150 return code; 4151 } 4152 4153 if (mod_args->is_set()) { 4154 // args_in contains -XX:VMOptionsFile and mod_args contains the 4155 // original options from args_in along with the options expanded 4156 // from the VMOptionsFile. Return a short-hand to the caller. 4157 *args_out = mod_args->get(); 4158 } else { 4159 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4160 } 4161 return JNI_OK; 4162 } 4163 4164 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4165 ScopedVMInitArgs* args_out) { 4166 // Remaining part of option string 4167 const char* tail; 4168 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4169 4170 for (int index = 0; index < args->nOptions; index++) { 4171 const JavaVMOption* option = args->options + index; 4172 if (ArgumentsExt::process_options(option)) { 4173 continue; 4174 } 4175 if (match_option(option, "-XX:Flags=", &tail)) { 4176 Arguments::set_jvm_flags_file(tail); 4177 continue; 4178 } 4179 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4180 if (vm_options_file_args.found_vm_options_file_arg()) { 4181 jio_fprintf(defaultStream::error_stream(), 4182 "The option '%s' is already specified in the options " 4183 "container '%s' so the specification of '%s' in the " 4184 "same options container is an error.\n", 4185 vm_options_file_args.vm_options_file_arg(), 4186 vm_options_file_args.container_name(), 4187 option->optionString); 4188 return JNI_EINVAL; 4189 } 4190 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4191 // If there's a VMOptionsFile, parse that 4192 jint code = insert_vm_options_file(args, tail, index, 4193 &vm_options_file_args, args_out); 4194 if (code != JNI_OK) { 4195 return code; 4196 } 4197 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4198 if (args_out->is_set()) { 4199 // The VMOptions file inserted some options so switch 'args' 4200 // to the new set of options, and continue processing which 4201 // preserves "last option wins" semantics. 4202 args = args_out->get(); 4203 // The first option from the VMOptionsFile replaces the 4204 // current option. So we back track to process the 4205 // replacement option. 4206 index--; 4207 } 4208 continue; 4209 } 4210 if (match_option(option, "-XX:+PrintVMOptions")) { 4211 PrintVMOptions = true; 4212 continue; 4213 } 4214 if (match_option(option, "-XX:-PrintVMOptions")) { 4215 PrintVMOptions = false; 4216 continue; 4217 } 4218 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4219 IgnoreUnrecognizedVMOptions = true; 4220 continue; 4221 } 4222 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4223 IgnoreUnrecognizedVMOptions = false; 4224 continue; 4225 } 4226 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4227 CommandLineFlags::printFlags(tty, false); 4228 vm_exit(0); 4229 } 4230 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4231 #if INCLUDE_NMT 4232 // The launcher did not setup nmt environment variable properly. 4233 if (!MemTracker::check_launcher_nmt_support(tail)) { 4234 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4235 } 4236 4237 // Verify if nmt option is valid. 4238 if (MemTracker::verify_nmt_option()) { 4239 // Late initialization, still in single-threaded mode. 4240 if (MemTracker::tracking_level() >= NMT_summary) { 4241 MemTracker::init(); 4242 } 4243 } else { 4244 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4245 } 4246 continue; 4247 #else 4248 jio_fprintf(defaultStream::error_stream(), 4249 "Native Memory Tracking is not supported in this VM\n"); 4250 return JNI_ERR; 4251 #endif 4252 } 4253 4254 #ifndef PRODUCT 4255 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4256 CommandLineFlags::printFlags(tty, true); 4257 vm_exit(0); 4258 } 4259 #endif 4260 } 4261 return JNI_OK; 4262 } 4263 4264 static void print_options(const JavaVMInitArgs *args) { 4265 const char* tail; 4266 for (int index = 0; index < args->nOptions; index++) { 4267 const JavaVMOption *option = args->options + index; 4268 if (match_option(option, "-XX:", &tail)) { 4269 logOption(tail); 4270 } 4271 } 4272 } 4273 4274 bool Arguments::handle_deprecated_print_gc_flags() { 4275 if (PrintGC) { 4276 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4277 } 4278 if (PrintGCDetails) { 4279 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4280 } 4281 4282 if (_gc_log_filename != NULL) { 4283 // -Xloggc was used to specify a filename 4284 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4285 4286 LogTarget(Error, logging) target; 4287 LogStream errstream(target); 4288 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4289 } else if (PrintGC || PrintGCDetails) { 4290 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4291 } 4292 return true; 4293 } 4294 4295 void Arguments::handle_extra_cms_flags(const char* msg) { 4296 SpecialFlag flag; 4297 const char *flag_name = "UseConcMarkSweepGC"; 4298 if (lookup_special_flag(flag_name, flag)) { 4299 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4300 warning("%s", msg); 4301 } 4302 } 4303 4304 // Parse entry point called from JNI_CreateJavaVM 4305 4306 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4307 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4308 4309 // Initialize ranges, constraints and writeables 4310 CommandLineFlagRangeList::init(); 4311 CommandLineFlagConstraintList::init(); 4312 CommandLineFlagWriteableList::init(); 4313 4314 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4315 const char* hotspotrc = ".hotspotrc"; 4316 bool settings_file_specified = false; 4317 bool needs_hotspotrc_warning = false; 4318 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4319 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4320 4321 // Pointers to current working set of containers 4322 JavaVMInitArgs* cur_cmd_args; 4323 JavaVMInitArgs* cur_java_options_args; 4324 JavaVMInitArgs* cur_java_tool_options_args; 4325 4326 // Containers for modified/expanded options 4327 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4328 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4329 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4330 4331 4332 jint code = 4333 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4334 if (code != JNI_OK) { 4335 return code; 4336 } 4337 4338 code = parse_java_options_environment_variable(&initial_java_options_args); 4339 if (code != JNI_OK) { 4340 return code; 4341 } 4342 4343 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4344 &mod_java_tool_options_args, 4345 &cur_java_tool_options_args); 4346 if (code != JNI_OK) { 4347 return code; 4348 } 4349 4350 code = expand_vm_options_as_needed(initial_cmd_args, 4351 &mod_cmd_args, 4352 &cur_cmd_args); 4353 if (code != JNI_OK) { 4354 return code; 4355 } 4356 4357 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4358 &mod_java_options_args, 4359 &cur_java_options_args); 4360 if (code != JNI_OK) { 4361 return code; 4362 } 4363 4364 const char* flags_file = Arguments::get_jvm_flags_file(); 4365 settings_file_specified = (flags_file != NULL); 4366 4367 if (IgnoreUnrecognizedVMOptions) { 4368 cur_cmd_args->ignoreUnrecognized = true; 4369 cur_java_tool_options_args->ignoreUnrecognized = true; 4370 cur_java_options_args->ignoreUnrecognized = true; 4371 } 4372 4373 // Parse specified settings file 4374 if (settings_file_specified) { 4375 if (!process_settings_file(flags_file, true, 4376 cur_cmd_args->ignoreUnrecognized)) { 4377 return JNI_EINVAL; 4378 } 4379 } else { 4380 #ifdef ASSERT 4381 // Parse default .hotspotrc settings file 4382 if (!process_settings_file(".hotspotrc", false, 4383 cur_cmd_args->ignoreUnrecognized)) { 4384 return JNI_EINVAL; 4385 } 4386 #else 4387 struct stat buf; 4388 if (os::stat(hotspotrc, &buf) == 0) { 4389 needs_hotspotrc_warning = true; 4390 } 4391 #endif 4392 } 4393 4394 if (PrintVMOptions) { 4395 print_options(cur_java_tool_options_args); 4396 print_options(cur_cmd_args); 4397 print_options(cur_java_options_args); 4398 } 4399 4400 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4401 jint result = parse_vm_init_args(cur_java_tool_options_args, 4402 cur_java_options_args, 4403 cur_cmd_args); 4404 4405 if (result != JNI_OK) { 4406 return result; 4407 } 4408 4409 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4410 SharedArchivePath = get_shared_archive_path(); 4411 if (SharedArchivePath == NULL) { 4412 return JNI_ENOMEM; 4413 } 4414 4415 // Set up VerifySharedSpaces 4416 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4417 VerifySharedSpaces = true; 4418 } 4419 4420 // Delay warning until here so that we've had a chance to process 4421 // the -XX:-PrintWarnings flag 4422 if (needs_hotspotrc_warning) { 4423 warning("%s file is present but has been ignored. " 4424 "Run with -XX:Flags=%s to load the file.", 4425 hotspotrc, hotspotrc); 4426 } 4427 4428 if (needs_module_property_warning) { 4429 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4430 " names that are reserved for internal use."); 4431 } 4432 4433 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4434 UNSUPPORTED_OPTION(UseLargePages); 4435 #endif 4436 4437 ArgumentsExt::report_unsupported_options(); 4438 4439 #ifndef PRODUCT 4440 if (TraceBytecodesAt != 0) { 4441 TraceBytecodes = true; 4442 } 4443 if (CountCompiledCalls) { 4444 if (UseCounterDecay) { 4445 warning("UseCounterDecay disabled because CountCalls is set"); 4446 UseCounterDecay = false; 4447 } 4448 } 4449 #endif // PRODUCT 4450 4451 if (ScavengeRootsInCode == 0) { 4452 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4453 warning("Forcing ScavengeRootsInCode non-zero"); 4454 } 4455 ScavengeRootsInCode = 1; 4456 } 4457 4458 if (!handle_deprecated_print_gc_flags()) { 4459 return JNI_EINVAL; 4460 } 4461 4462 // Set object alignment values. 4463 set_object_alignment(); 4464 4465 #if !INCLUDE_CDS 4466 if (DumpSharedSpaces || RequireSharedSpaces) { 4467 jio_fprintf(defaultStream::error_stream(), 4468 "Shared spaces are not supported in this VM\n"); 4469 return JNI_ERR; 4470 } 4471 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 4472 log_is_enabled(Info, cds)) { 4473 warning("Shared spaces are not supported in this VM"); 4474 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4475 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4476 } 4477 no_shared_spaces("CDS Disabled"); 4478 #endif // INCLUDE_CDS 4479 4480 return JNI_OK; 4481 } 4482 4483 jint Arguments::apply_ergo() { 4484 // Set flags based on ergonomics. 4485 set_ergonomics_flags(); 4486 4487 #if INCLUDE_JVMCI 4488 set_jvmci_specific_flags(); 4489 #endif 4490 4491 set_shared_spaces_flags(); 4492 4493 #if defined(SPARC) 4494 // BIS instructions require 'membar' instruction regardless of the number 4495 // of CPUs because in virtualized/container environments which might use only 1 4496 // CPU, BIS instructions may produce incorrect results. 4497 4498 if (FLAG_IS_DEFAULT(AssumeMP)) { 4499 FLAG_SET_DEFAULT(AssumeMP, true); 4500 } 4501 #endif 4502 4503 // Check the GC selections again. 4504 if (!check_gc_consistency()) { 4505 return JNI_EINVAL; 4506 } 4507 4508 if (TieredCompilation) { 4509 set_tiered_flags(); 4510 } else { 4511 int max_compilation_policy_choice = 1; 4512 #ifdef COMPILER2 4513 if (is_server_compilation_mode_vm()) { 4514 max_compilation_policy_choice = 2; 4515 } 4516 #endif 4517 // Check if the policy is valid. 4518 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4519 vm_exit_during_initialization( 4520 "Incompatible compilation policy selected", NULL); 4521 } 4522 // Scale CompileThreshold 4523 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4524 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4525 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4526 } 4527 } 4528 4529 #ifdef COMPILER2 4530 #ifndef PRODUCT 4531 if (PrintIdealGraphLevel > 0) { 4532 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4533 } 4534 #endif 4535 #endif 4536 4537 // Set heap size based on available physical memory 4538 set_heap_size(); 4539 4540 ArgumentsExt::set_gc_specific_flags(); 4541 4542 // Initialize Metaspace flags and alignments 4543 Metaspace::ergo_initialize(); 4544 4545 // Set bytecode rewriting flags 4546 set_bytecode_flags(); 4547 4548 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4549 jint code = set_aggressive_opts_flags(); 4550 if (code != JNI_OK) { 4551 return code; 4552 } 4553 4554 // Turn off biased locking for locking debug mode flags, 4555 // which are subtly different from each other but neither works with 4556 // biased locking 4557 if (UseHeavyMonitors 4558 #ifdef COMPILER1 4559 || !UseFastLocking 4560 #endif // COMPILER1 4561 #if INCLUDE_JVMCI 4562 || !JVMCIUseFastLocking 4563 #endif 4564 ) { 4565 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4566 // flag set to true on command line; warn the user that they 4567 // can't enable biased locking here 4568 warning("Biased Locking is not supported with locking debug flags" 4569 "; ignoring UseBiasedLocking flag." ); 4570 } 4571 UseBiasedLocking = false; 4572 } 4573 4574 #ifdef CC_INTERP 4575 // Clear flags not supported on zero. 4576 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4577 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4578 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4579 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4580 #endif // CC_INTERP 4581 4582 #ifdef COMPILER2 4583 if (!EliminateLocks) { 4584 EliminateNestedLocks = false; 4585 } 4586 if (!Inline) { 4587 IncrementalInline = false; 4588 } 4589 #ifndef PRODUCT 4590 if (!IncrementalInline) { 4591 AlwaysIncrementalInline = false; 4592 } 4593 #endif 4594 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4595 // nothing to use the profiling, turn if off 4596 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4597 } 4598 #endif 4599 4600 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4601 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4602 DebugNonSafepoints = true; 4603 } 4604 4605 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4606 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4607 } 4608 4609 if (UseOnStackReplacement && !UseLoopCounter) { 4610 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4611 FLAG_SET_DEFAULT(UseLoopCounter, true); 4612 } 4613 4614 #ifndef PRODUCT 4615 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4616 if (use_vm_log()) { 4617 LogVMOutput = true; 4618 } 4619 } 4620 #endif // PRODUCT 4621 4622 if (PrintCommandLineFlags) { 4623 CommandLineFlags::printSetFlags(tty); 4624 } 4625 4626 // Apply CPU specific policy for the BiasedLocking 4627 if (UseBiasedLocking) { 4628 if (!VM_Version::use_biased_locking() && 4629 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4630 UseBiasedLocking = false; 4631 } 4632 } 4633 #ifdef COMPILER2 4634 if (!UseBiasedLocking || EmitSync != 0) { 4635 UseOptoBiasInlining = false; 4636 } 4637 #endif 4638 4639 return JNI_OK; 4640 } 4641 4642 jint Arguments::adjust_after_os() { 4643 if (UseNUMA) { 4644 if (UseParallelGC || UseParallelOldGC) { 4645 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4646 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4647 } 4648 } 4649 // UseNUMAInterleaving is set to ON for all collectors and 4650 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4651 // such as the parallel collector for Linux and Solaris will 4652 // interleave old gen and survivor spaces on top of NUMA 4653 // allocation policy for the eden space. 4654 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4655 // all platforms and ParallelGC on Windows will interleave all 4656 // of the heap spaces across NUMA nodes. 4657 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4658 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4659 } 4660 } 4661 return JNI_OK; 4662 } 4663 4664 int Arguments::PropertyList_count(SystemProperty* pl) { 4665 int count = 0; 4666 while(pl != NULL) { 4667 count++; 4668 pl = pl->next(); 4669 } 4670 return count; 4671 } 4672 4673 // Return the number of readable properties. 4674 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4675 int count = 0; 4676 while(pl != NULL) { 4677 if (pl->is_readable()) { 4678 count++; 4679 } 4680 pl = pl->next(); 4681 } 4682 return count; 4683 } 4684 4685 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4686 assert(key != NULL, "just checking"); 4687 SystemProperty* prop; 4688 for (prop = pl; prop != NULL; prop = prop->next()) { 4689 if (strcmp(key, prop->key()) == 0) return prop->value(); 4690 } 4691 return NULL; 4692 } 4693 4694 // Return the value of the requested property provided that it is a readable property. 4695 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4696 assert(key != NULL, "just checking"); 4697 SystemProperty* prop; 4698 // Return the property value if the keys match and the property is not internal or 4699 // it's the special internal property "jdk.boot.class.path.append". 4700 for (prop = pl; prop != NULL; prop = prop->next()) { 4701 if (strcmp(key, prop->key()) == 0) { 4702 if (!prop->internal()) { 4703 return prop->value(); 4704 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4705 return prop->value(); 4706 } else { 4707 // Property is internal and not jdk.boot.class.path.append so return NULL. 4708 return NULL; 4709 } 4710 } 4711 } 4712 return NULL; 4713 } 4714 4715 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4716 int count = 0; 4717 const char* ret_val = NULL; 4718 4719 while(pl != NULL) { 4720 if(count >= index) { 4721 ret_val = pl->key(); 4722 break; 4723 } 4724 count++; 4725 pl = pl->next(); 4726 } 4727 4728 return ret_val; 4729 } 4730 4731 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4732 int count = 0; 4733 char* ret_val = NULL; 4734 4735 while(pl != NULL) { 4736 if(count >= index) { 4737 ret_val = pl->value(); 4738 break; 4739 } 4740 count++; 4741 pl = pl->next(); 4742 } 4743 4744 return ret_val; 4745 } 4746 4747 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4748 SystemProperty* p = *plist; 4749 if (p == NULL) { 4750 *plist = new_p; 4751 } else { 4752 while (p->next() != NULL) { 4753 p = p->next(); 4754 } 4755 p->set_next(new_p); 4756 } 4757 } 4758 4759 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4760 bool writeable, bool internal) { 4761 if (plist == NULL) 4762 return; 4763 4764 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4765 PropertyList_add(plist, new_p); 4766 } 4767 4768 void Arguments::PropertyList_add(SystemProperty *element) { 4769 PropertyList_add(&_system_properties, element); 4770 } 4771 4772 // This add maintains unique property key in the list. 4773 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4774 PropertyAppendable append, PropertyWriteable writeable, 4775 PropertyInternal internal) { 4776 if (plist == NULL) 4777 return; 4778 4779 // If property key exist then update with new value. 4780 SystemProperty* prop; 4781 for (prop = *plist; prop != NULL; prop = prop->next()) { 4782 if (strcmp(k, prop->key()) == 0) { 4783 if (append == AppendProperty) { 4784 prop->append_value(v); 4785 } else { 4786 prop->set_value(v); 4787 } 4788 return; 4789 } 4790 } 4791 4792 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4793 } 4794 4795 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4796 // Returns true if all of the source pointed by src has been copied over to 4797 // the destination buffer pointed by buf. Otherwise, returns false. 4798 // Notes: 4799 // 1. If the length (buflen) of the destination buffer excluding the 4800 // NULL terminator character is not long enough for holding the expanded 4801 // pid characters, it also returns false instead of returning the partially 4802 // expanded one. 4803 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4804 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4805 char* buf, size_t buflen) { 4806 const char* p = src; 4807 char* b = buf; 4808 const char* src_end = &src[srclen]; 4809 char* buf_end = &buf[buflen - 1]; 4810 4811 while (p < src_end && b < buf_end) { 4812 if (*p == '%') { 4813 switch (*(++p)) { 4814 case '%': // "%%" ==> "%" 4815 *b++ = *p++; 4816 break; 4817 case 'p': { // "%p" ==> current process id 4818 // buf_end points to the character before the last character so 4819 // that we could write '\0' to the end of the buffer. 4820 size_t buf_sz = buf_end - b + 1; 4821 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4822 4823 // if jio_snprintf fails or the buffer is not long enough to hold 4824 // the expanded pid, returns false. 4825 if (ret < 0 || ret >= (int)buf_sz) { 4826 return false; 4827 } else { 4828 b += ret; 4829 assert(*b == '\0', "fail in copy_expand_pid"); 4830 if (p == src_end && b == buf_end + 1) { 4831 // reach the end of the buffer. 4832 return true; 4833 } 4834 } 4835 p++; 4836 break; 4837 } 4838 default : 4839 *b++ = '%'; 4840 } 4841 } else { 4842 *b++ = *p++; 4843 } 4844 } 4845 *b = '\0'; 4846 return (p == src_end); // return false if not all of the source was copied 4847 }