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 bool Arguments::_has_profile = false; 82 size_t Arguments::_conservative_max_heap_alignment = 0; 83 size_t Arguments::_min_heap_size = 0; 84 Arguments::Mode Arguments::_mode = _mixed; 85 bool Arguments::_java_compiler = false; 86 bool Arguments::_xdebug_mode = false; 87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 89 int Arguments::_sun_java_launcher_pid = -1; 90 bool Arguments::_sun_java_launcher_is_altjvm = false; 91 92 // These parameters are reset in method parse_vm_init_args() 93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 95 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 96 bool Arguments::_ClipInlining = ClipInlining; 97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 99 100 char* Arguments::SharedArchivePath = NULL; 101 102 AgentLibraryList Arguments::_libraryList; 103 AgentLibraryList Arguments::_agentList; 104 105 abort_hook_t Arguments::_abort_hook = NULL; 106 exit_hook_t Arguments::_exit_hook = NULL; 107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 108 109 110 SystemProperty *Arguments::_sun_boot_library_path = NULL; 111 SystemProperty *Arguments::_java_library_path = NULL; 112 SystemProperty *Arguments::_java_home = NULL; 113 SystemProperty *Arguments::_java_class_path = NULL; 114 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 115 116 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 117 PathString *Arguments::_system_boot_class_path = NULL; 118 bool Arguments::_has_jimage = false; 119 120 char* Arguments::_ext_dirs = NULL; 121 122 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 123 // part of the option string. 124 static bool match_option(const JavaVMOption *option, const char* name, 125 const char** tail) { 126 size_t len = strlen(name); 127 if (strncmp(option->optionString, name, len) == 0) { 128 *tail = option->optionString + len; 129 return true; 130 } else { 131 return false; 132 } 133 } 134 135 // Check if 'option' matches 'name'. No "tail" is allowed. 136 static bool match_option(const JavaVMOption *option, const char* name) { 137 const char* tail = NULL; 138 bool result = match_option(option, name, &tail); 139 if (tail != NULL && *tail == '\0') { 140 return result; 141 } else { 142 return false; 143 } 144 } 145 146 // Return true if any of the strings in null-terminated array 'names' matches. 147 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 148 // the option must match exactly. 149 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 150 bool tail_allowed) { 151 for (/* empty */; *names != NULL; ++names) { 152 if (match_option(option, *names, tail)) { 153 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 154 return true; 155 } 156 } 157 } 158 return false; 159 } 160 161 static void logOption(const char* opt) { 162 if (PrintVMOptions) { 163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 164 } 165 } 166 167 bool needs_module_property_warning = false; 168 169 #define MODULE_PROPERTY_PREFIX "jdk.module." 170 #define MODULE_PROPERTY_PREFIX_LEN 11 171 #define ADDEXPORTS "addexports" 172 #define ADDEXPORTS_LEN 10 173 #define ADDREADS "addreads" 174 #define ADDREADS_LEN 8 175 #define ADDOPENS "addopens" 176 #define ADDOPENS_LEN 8 177 #define PATCH "patch" 178 #define PATCH_LEN 5 179 #define ADDMODS "addmods" 180 #define ADDMODS_LEN 7 181 #define LIMITMODS "limitmods" 182 #define LIMITMODS_LEN 9 183 #define PATH "path" 184 #define PATH_LEN 4 185 #define UPGRADE_PATH "upgrade.path" 186 #define UPGRADE_PATH_LEN 12 187 188 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 189 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 190 return ((strncmp(option, property, len) == 0) && 191 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 192 } 193 194 // Return true if property starts with "jdk.module." and its ensuing chars match 195 // any of the reserved module properties. 196 // property should be passed without the leading "-D". 197 bool Arguments::is_internal_module_property(const char* property) { 198 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 199 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 200 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 201 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 202 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 203 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 204 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 205 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 206 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 207 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 208 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 209 return true; 210 } 211 } 212 return false; 213 } 214 215 // Process java launcher properties. 216 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 217 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 218 // sun.java.launcher.pid is defined. 219 // Must do this before setting up other system properties, 220 // as some of them may depend on launcher type. 221 for (int index = 0; index < args->nOptions; index++) { 222 const JavaVMOption* option = args->options + index; 223 const char* tail; 224 225 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 226 process_java_launcher_argument(tail, option->extraInfo); 227 continue; 228 } 229 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 230 if (strcmp(tail, "true") == 0) { 231 _sun_java_launcher_is_altjvm = true; 232 } 233 continue; 234 } 235 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 236 _sun_java_launcher_pid = atoi(tail); 237 continue; 238 } 239 } 240 } 241 242 // Initialize system properties key and value. 243 void Arguments::init_system_properties() { 244 245 // Set up _system_boot_class_path which is not a property but 246 // relies heavily on argument processing and the jdk.boot.class.path.append 247 // property. It is used to store the underlying system boot class path. 248 _system_boot_class_path = new PathString(NULL); 249 250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 251 "Java Virtual Machine Specification", false)); 252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 253 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 254 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 255 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 256 257 // Following are JVMTI agent writable properties. 258 // Properties values are set to NULL and they are 259 // os specific they are initialized in os::init_system_properties_values(). 260 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 261 _java_library_path = new SystemProperty("java.library.path", NULL, true); 262 _java_home = new SystemProperty("java.home", NULL, true); 263 _java_class_path = new SystemProperty("java.class.path", "", true); 264 // jdk.boot.class.path.append is a non-writeable, internal property. 265 // It can only be set by either: 266 // - -Xbootclasspath/a: 267 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 268 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 269 270 // Add to System Property list. 271 PropertyList_add(&_system_properties, _sun_boot_library_path); 272 PropertyList_add(&_system_properties, _java_library_path); 273 PropertyList_add(&_system_properties, _java_home); 274 PropertyList_add(&_system_properties, _java_class_path); 275 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 276 277 // Set OS specific system properties values 278 os::init_system_properties_values(); 279 } 280 281 // Update/Initialize System properties after JDK version number is known 282 void Arguments::init_version_specific_system_properties() { 283 enum { bufsz = 16 }; 284 char buffer[bufsz]; 285 const char* spec_vendor = "Oracle Corporation"; 286 uint32_t spec_version = JDK_Version::current().major_version(); 287 288 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 289 290 PropertyList_add(&_system_properties, 291 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 292 PropertyList_add(&_system_properties, 293 new SystemProperty("java.vm.specification.version", buffer, false)); 294 PropertyList_add(&_system_properties, 295 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 296 } 297 298 /* 299 * -XX argument processing: 300 * 301 * -XX arguments are defined in several places, such as: 302 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 303 * -XX arguments are parsed in parse_argument(). 304 * -XX argument bounds checking is done in check_vm_args_consistency(). 305 * 306 * Over time -XX arguments may change. There are mechanisms to handle common cases: 307 * 308 * ALIASED: An option that is simply another name for another option. This is often 309 * part of the process of deprecating a flag, but not all aliases need 310 * to be deprecated. 311 * 312 * Create an alias for an option by adding the old and new option names to the 313 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 314 * 315 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 316 * support may be removed in the future. Both regular and aliased options may be 317 * deprecated. 318 * 319 * Add a deprecation warning for an option (or alias) by adding an entry in the 320 * "special_jvm_flags" table and setting the "deprecated_in" field. 321 * Often an option "deprecated" in one major release will 322 * be made "obsolete" in the next. In this case the entry should also have its 323 * "obsolete_in" field set. 324 * 325 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 326 * on the command line. A warning is printed to let the user know that option might not 327 * be accepted in the future. 328 * 329 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 330 * table and setting the "obsolete_in" field. 331 * 332 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 333 * to the current JDK version. The system will flatly refuse to admit the existence of 334 * the flag. This allows a flag to die automatically over JDK releases. 335 * 336 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 337 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 338 * - Newly obsolete or expired deprecated options should have their global variable 339 * definitions removed (from globals.hpp, etc) and related implementations removed. 340 * 341 * Recommended approach for removing options: 342 * 343 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 344 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 345 * 346 * To remove internal options (e.g. diagnostic, experimental, develop options), use 347 * a 2-step model adding major release numbers to the obsolete and expire columns. 348 * 349 * To change the name of an option, use the alias table as well as a 2-step 350 * model adding major release numbers to the deprecate and expire columns. 351 * Think twice about aliasing commonly used customer options. 352 * 353 * There are times when it is appropriate to leave a future release number as undefined. 354 * 355 * Tests: Aliases should be tested in VMAliasOptions.java. 356 * Deprecated options should be tested in VMDeprecatedOptions.java. 357 */ 358 359 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 360 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 361 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 362 // the command-line as usual, but will issue a warning. 363 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 364 // the command-line, while issuing a warning and ignoring the flag value. 365 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 366 // existence of the flag. 367 // 368 // MANUAL CLEANUP ON JDK VERSION UPDATES: 369 // This table ensures that the handling of options will update automatically when the JDK 370 // version is incremented, but the source code needs to be cleanup up manually: 371 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 372 // variable should be removed, as well as users of the variable. 373 // - As "deprecated" options age into "obsolete" options, move the entry into the 374 // "Obsolete Flags" section of the table. 375 // - All expired options should be removed from the table. 376 static SpecialFlag const special_jvm_flags[] = { 377 // -------------- Deprecated Flags -------------- 378 // --- Non-alias flags - sorted by obsolete_in then expired_in: 379 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 380 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 381 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() }, 382 383 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 384 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 385 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 386 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 387 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 388 389 // -------------- Obsolete Flags - sorted by expired_in -------------- 390 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 391 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 392 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 393 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 394 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 395 396 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 397 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 398 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 399 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 400 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 401 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 402 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 403 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 404 #endif 405 406 { NULL, JDK_Version(0), JDK_Version(0) } 407 }; 408 409 // Flags that are aliases for other flags. 410 typedef struct { 411 const char* alias_name; 412 const char* real_name; 413 } AliasedFlag; 414 415 static AliasedFlag const aliased_jvm_flags[] = { 416 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 417 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 418 { NULL, NULL} 419 }; 420 421 // NOTE: A compatibility request will be necessary for each alias to be removed. 422 static AliasedLoggingFlag const aliased_logging_flags[] = { 423 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 424 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 425 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 426 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 427 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 428 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 429 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 430 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 431 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 432 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 433 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 434 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 435 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 436 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 437 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 438 }; 439 440 #ifndef PRODUCT 441 // These options are removed in jdk9. Remove this code for jdk10. 442 static AliasedFlag const removed_develop_logging_flags[] = { 443 { "TraceClassInitialization", "-Xlog:class+init" }, 444 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 445 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 446 { "TraceItables", "-Xlog:itables=debug" }, 447 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 448 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 449 { "TraceStartupTime", "-Xlog:startuptime" }, 450 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 451 { "PrintVtables", "-Xlog:vtables=debug" }, 452 { "VerboseVerification", "-Xlog:verification" }, 453 { NULL, NULL } 454 }; 455 #endif //PRODUCT 456 457 // Return true if "v" is less than "other", where "other" may be "undefined". 458 static bool version_less_than(JDK_Version v, JDK_Version other) { 459 assert(!v.is_undefined(), "must be defined"); 460 if (!other.is_undefined() && v.compare(other) >= 0) { 461 return false; 462 } else { 463 return true; 464 } 465 } 466 467 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 468 469 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 470 // Allow extensions to have priority 471 if (lookup_special_flag_ext(flag_name, flag)) { 472 return true; 473 } 474 475 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 476 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 477 flag = special_jvm_flags[i]; 478 return true; 479 } 480 } 481 return false; 482 } 483 484 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 485 assert(version != NULL, "Must provide a version buffer"); 486 SpecialFlag flag; 487 if (lookup_special_flag(flag_name, flag)) { 488 if (!flag.obsolete_in.is_undefined()) { 489 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 490 *version = flag.obsolete_in; 491 return true; 492 } 493 } 494 } 495 return false; 496 } 497 498 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 499 assert(version != NULL, "Must provide a version buffer"); 500 SpecialFlag flag; 501 if (lookup_special_flag(flag_name, flag)) { 502 if (!flag.deprecated_in.is_undefined()) { 503 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 504 version_less_than(JDK_Version::current(), flag.expired_in)) { 505 *version = flag.deprecated_in; 506 return 1; 507 } else { 508 return -1; 509 } 510 } 511 } 512 return 0; 513 } 514 515 #ifndef PRODUCT 516 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 517 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 518 const AliasedFlag& flag = removed_develop_logging_flags[i]; 519 if (strcmp(flag.alias_name, name) == 0) { 520 return flag.real_name; 521 } 522 } 523 return NULL; 524 } 525 #endif // PRODUCT 526 527 const char* Arguments::real_flag_name(const char *flag_name) { 528 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 529 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 530 if (strcmp(flag_status.alias_name, flag_name) == 0) { 531 return flag_status.real_name; 532 } 533 } 534 return flag_name; 535 } 536 537 #ifdef ASSERT 538 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 539 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 540 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 541 return true; 542 } 543 } 544 return false; 545 } 546 547 static bool verify_special_jvm_flags() { 548 bool success = true; 549 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 550 const SpecialFlag& flag = special_jvm_flags[i]; 551 if (lookup_special_flag(flag.name, i)) { 552 warning("Duplicate special flag declaration \"%s\"", flag.name); 553 success = false; 554 } 555 if (flag.deprecated_in.is_undefined() && 556 flag.obsolete_in.is_undefined()) { 557 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 558 success = false; 559 } 560 561 if (!flag.deprecated_in.is_undefined()) { 562 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 563 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 564 success = false; 565 } 566 567 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 568 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 569 success = false; 570 } 571 } 572 573 if (!flag.obsolete_in.is_undefined()) { 574 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 575 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 576 success = false; 577 } 578 579 // if flag has become obsolete it should not have a "globals" flag defined anymore. 580 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 581 if (Flag::find_flag(flag.name) != NULL) { 582 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 583 success = false; 584 } 585 } 586 } 587 588 if (!flag.expired_in.is_undefined()) { 589 // if flag has become expired it should not have a "globals" flag defined anymore. 590 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 591 if (Flag::find_flag(flag.name) != NULL) { 592 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 593 success = false; 594 } 595 } 596 } 597 598 } 599 return success; 600 } 601 #endif 602 603 // Parses a size specification string. 604 bool Arguments::atojulong(const char *s, julong* result) { 605 julong n = 0; 606 607 // First char must be a digit. Don't allow negative numbers or leading spaces. 608 if (!isdigit(*s)) { 609 return false; 610 } 611 612 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 613 char* remainder; 614 errno = 0; 615 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 616 if (errno != 0) { 617 return false; 618 } 619 620 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 621 if (remainder == s || strlen(remainder) > 1) { 622 return false; 623 } 624 625 switch (*remainder) { 626 case 'T': case 't': 627 *result = n * G * K; 628 // Check for overflow. 629 if (*result/((julong)G * K) != n) return false; 630 return true; 631 case 'G': case 'g': 632 *result = n * G; 633 if (*result/G != n) return false; 634 return true; 635 case 'M': case 'm': 636 *result = n * M; 637 if (*result/M != n) return false; 638 return true; 639 case 'K': case 'k': 640 *result = n * K; 641 if (*result/K != n) return false; 642 return true; 643 case '\0': 644 *result = n; 645 return true; 646 default: 647 return false; 648 } 649 } 650 651 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 652 if (size < min_size) return arg_too_small; 653 if (size > max_size) return arg_too_big; 654 return arg_in_range; 655 } 656 657 // Describe an argument out of range error 658 void Arguments::describe_range_error(ArgsRange errcode) { 659 switch(errcode) { 660 case arg_too_big: 661 jio_fprintf(defaultStream::error_stream(), 662 "The specified size exceeds the maximum " 663 "representable size.\n"); 664 break; 665 case arg_too_small: 666 case arg_unreadable: 667 case arg_in_range: 668 // do nothing for now 669 break; 670 default: 671 ShouldNotReachHere(); 672 } 673 } 674 675 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 676 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 677 return true; 678 } else { 679 return false; 680 } 681 } 682 683 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 684 char* end; 685 errno = 0; 686 double v = strtod(value, &end); 687 if ((errno != 0) || (*end != 0)) { 688 return false; 689 } 690 691 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 692 return true; 693 } 694 return false; 695 } 696 697 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 698 julong v; 699 int int_v; 700 intx intx_v; 701 bool is_neg = false; 702 Flag* result = Flag::find_flag(name, strlen(name)); 703 704 if (result == NULL) { 705 return false; 706 } 707 708 // Check the sign first since atojulong() parses only unsigned values. 709 if (*value == '-') { 710 if (!result->is_intx() && !result->is_int()) { 711 return false; 712 } 713 value++; 714 is_neg = true; 715 } 716 if (!Arguments::atojulong(value, &v)) { 717 return false; 718 } 719 if (result->is_int()) { 720 int_v = (int) v; 721 if (is_neg) { 722 int_v = -int_v; 723 } 724 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 725 } else if (result->is_uint()) { 726 uint uint_v = (uint) v; 727 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 728 } else if (result->is_intx()) { 729 intx_v = (intx) v; 730 if (is_neg) { 731 intx_v = -intx_v; 732 } 733 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 734 } else if (result->is_uintx()) { 735 uintx uintx_v = (uintx) v; 736 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 737 } else if (result->is_uint64_t()) { 738 uint64_t uint64_t_v = (uint64_t) v; 739 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 740 } else if (result->is_size_t()) { 741 size_t size_t_v = (size_t) v; 742 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 743 } else if (result->is_double()) { 744 double double_v = (double) v; 745 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS; 746 } else { 747 return false; 748 } 749 } 750 751 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 752 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 753 // Contract: CommandLineFlags always returns a pointer that needs freeing. 754 FREE_C_HEAP_ARRAY(char, value); 755 return true; 756 } 757 758 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 759 const char* old_value = ""; 760 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 761 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 762 size_t new_len = strlen(new_value); 763 const char* value; 764 char* free_this_too = NULL; 765 if (old_len == 0) { 766 value = new_value; 767 } else if (new_len == 0) { 768 value = old_value; 769 } else { 770 size_t length = old_len + 1 + new_len + 1; 771 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 772 // each new setting adds another LINE to the switch: 773 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 774 value = buf; 775 free_this_too = buf; 776 } 777 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 778 // CommandLineFlags always returns a pointer that needs freeing. 779 FREE_C_HEAP_ARRAY(char, value); 780 if (free_this_too != NULL) { 781 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 782 FREE_C_HEAP_ARRAY(char, free_this_too); 783 } 784 return true; 785 } 786 787 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 788 const char* real_name = real_flag_name(arg); 789 JDK_Version since = JDK_Version(); 790 switch (is_deprecated_flag(arg, &since)) { 791 case -1: 792 return NULL; // obsolete or expired, don't process normally 793 case 0: 794 return real_name; 795 case 1: { 796 if (warn) { 797 char version[256]; 798 since.to_string(version, sizeof(version)); 799 if (real_name != arg) { 800 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 801 arg, version, real_name); 802 } else { 803 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 804 arg, version); 805 } 806 } 807 return real_name; 808 } 809 } 810 ShouldNotReachHere(); 811 return NULL; 812 } 813 814 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 815 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 816 // Set tagset string buffer at max size of 256, large enough for any alias tagset 817 const int max_tagset_size = 256; 818 int max_tagset_len = max_tagset_size - 1; 819 char tagset_buffer[max_tagset_size]; 820 tagset_buffer[0] = '\0'; 821 822 // Write tag-set for aliased logging option, in string list form 823 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 824 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 825 if (i > 0) { 826 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 827 } 828 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 829 } 830 if (!alf.exactMatch) { 831 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 832 } 833 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 834 (on) ? "+" : "-", 835 name, 836 tagset_buffer, 837 (on) ? LogLevel::name(alf.level) : "off"); 838 } 839 840 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 841 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 842 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 843 if (strcmp(alf.alias_name, name) == 0) { 844 log_deprecated_flag(name, on, alf); 845 return alf; 846 } 847 } 848 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 849 return a; 850 } 851 852 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 853 854 // range of acceptable characters spelled out for portability reasons 855 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 856 #define BUFLEN 255 857 char name[BUFLEN+1]; 858 char dummy; 859 const char* real_name; 860 bool warn_if_deprecated = true; 861 862 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 863 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 864 if (alf.alias_name != NULL){ 865 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 866 return true; 867 } 868 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 869 if (real_name == NULL) { 870 return false; 871 } 872 return set_bool_flag(real_name, false, origin); 873 } 874 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 875 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 876 if (alf.alias_name != NULL){ 877 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 878 return true; 879 } 880 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 881 if (real_name == NULL) { 882 return false; 883 } 884 return set_bool_flag(real_name, true, origin); 885 } 886 887 char punct; 888 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 889 const char* value = strchr(arg, '=') + 1; 890 Flag* flag; 891 892 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 893 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 894 if (alf.alias_name != NULL) { 895 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 896 return true; 897 } 898 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 899 if (real_name == NULL) { 900 return false; 901 } 902 flag = Flag::find_flag(real_name); 903 if (flag != NULL && flag->is_ccstr()) { 904 if (flag->ccstr_accumulates()) { 905 return append_to_string_flag(real_name, value, origin); 906 } else { 907 if (value[0] == '\0') { 908 value = NULL; 909 } 910 return set_string_flag(real_name, value, origin); 911 } 912 } else { 913 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 914 } 915 } 916 917 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 918 const char* value = strchr(arg, '=') + 1; 919 // -XX:Foo:=xxx will reset the string flag to the given value. 920 if (value[0] == '\0') { 921 value = NULL; 922 } 923 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 924 if (real_name == NULL) { 925 return false; 926 } 927 return set_string_flag(real_name, value, origin); 928 } 929 930 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 931 #define SIGNED_NUMBER_RANGE "[-0123456789]" 932 #define NUMBER_RANGE "[0123456789eE+-]" 933 char value[BUFLEN + 1]; 934 char value2[BUFLEN + 1]; 935 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 936 // Looks like a floating-point number -- try again with more lenient format string 937 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 938 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 939 if (real_name == NULL) { 940 return false; 941 } 942 return set_fp_numeric_flag(real_name, value, origin); 943 } 944 } 945 946 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 947 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 948 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 949 if (real_name == NULL) { 950 return false; 951 } 952 return set_numeric_flag(real_name, value, origin); 953 } 954 955 return false; 956 } 957 958 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 959 assert(bldarray != NULL, "illegal argument"); 960 961 if (arg == NULL) { 962 return; 963 } 964 965 int new_count = *count + 1; 966 967 // expand the array and add arg to the last element 968 if (*bldarray == NULL) { 969 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 970 } else { 971 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 972 } 973 (*bldarray)[*count] = os::strdup_check_oom(arg); 974 *count = new_count; 975 } 976 977 void Arguments::build_jvm_args(const char* arg) { 978 add_string(&_jvm_args_array, &_num_jvm_args, arg); 979 } 980 981 void Arguments::build_jvm_flags(const char* arg) { 982 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 983 } 984 985 // utility function to return a string that concatenates all 986 // strings in a given char** array 987 const char* Arguments::build_resource_string(char** args, int count) { 988 if (args == NULL || count == 0) { 989 return NULL; 990 } 991 size_t length = 0; 992 for (int i = 0; i < count; i++) { 993 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 994 } 995 char* s = NEW_RESOURCE_ARRAY(char, length); 996 char* dst = s; 997 for (int j = 0; j < count; j++) { 998 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 999 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1000 dst += offset; 1001 length -= offset; 1002 } 1003 return (const char*) s; 1004 } 1005 1006 void Arguments::print_on(outputStream* st) { 1007 st->print_cr("VM Arguments:"); 1008 if (num_jvm_flags() > 0) { 1009 st->print("jvm_flags: "); print_jvm_flags_on(st); 1010 st->cr(); 1011 } 1012 if (num_jvm_args() > 0) { 1013 st->print("jvm_args: "); print_jvm_args_on(st); 1014 st->cr(); 1015 } 1016 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1017 if (_java_class_path != NULL) { 1018 char* path = _java_class_path->value(); 1019 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1020 } 1021 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1022 } 1023 1024 void Arguments::print_summary_on(outputStream* st) { 1025 // Print the command line. Environment variables that are helpful for 1026 // reproducing the problem are written later in the hs_err file. 1027 // flags are from setting file 1028 if (num_jvm_flags() > 0) { 1029 st->print_raw("Settings File: "); 1030 print_jvm_flags_on(st); 1031 st->cr(); 1032 } 1033 // args are the command line and environment variable arguments. 1034 st->print_raw("Command Line: "); 1035 if (num_jvm_args() > 0) { 1036 print_jvm_args_on(st); 1037 } 1038 // this is the classfile and any arguments to the java program 1039 if (java_command() != NULL) { 1040 st->print("%s", java_command()); 1041 } 1042 st->cr(); 1043 } 1044 1045 void Arguments::print_jvm_flags_on(outputStream* st) { 1046 if (_num_jvm_flags > 0) { 1047 for (int i=0; i < _num_jvm_flags; i++) { 1048 st->print("%s ", _jvm_flags_array[i]); 1049 } 1050 } 1051 } 1052 1053 void Arguments::print_jvm_args_on(outputStream* st) { 1054 if (_num_jvm_args > 0) { 1055 for (int i=0; i < _num_jvm_args; i++) { 1056 st->print("%s ", _jvm_args_array[i]); 1057 } 1058 } 1059 } 1060 1061 bool Arguments::process_argument(const char* arg, 1062 jboolean ignore_unrecognized, 1063 Flag::Flags origin) { 1064 JDK_Version since = JDK_Version(); 1065 1066 if (parse_argument(arg, origin)) { 1067 return true; 1068 } 1069 1070 // Determine if the flag has '+', '-', or '=' characters. 1071 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1072 const char* const argname = has_plus_minus ? arg + 1 : arg; 1073 1074 size_t arg_len; 1075 const char* equal_sign = strchr(argname, '='); 1076 if (equal_sign == NULL) { 1077 arg_len = strlen(argname); 1078 } else { 1079 arg_len = equal_sign - argname; 1080 } 1081 1082 // Only make the obsolete check for valid arguments. 1083 if (arg_len <= BUFLEN) { 1084 // Construct a string which consists only of the argument name without '+', '-', or '='. 1085 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1086 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1087 if (is_obsolete_flag(stripped_argname, &since)) { 1088 char version[256]; 1089 since.to_string(version, sizeof(version)); 1090 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1091 return true; 1092 } 1093 #ifndef PRODUCT 1094 else { 1095 const char* replacement; 1096 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1097 log_warning(arguments)("%s has been removed. Please use %s instead.", 1098 stripped_argname, 1099 replacement); 1100 return false; 1101 } 1102 } 1103 #endif //PRODUCT 1104 } 1105 1106 // For locked flags, report a custom error message if available. 1107 // Otherwise, report the standard unrecognized VM option. 1108 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1109 if (found_flag != NULL) { 1110 char locked_message_buf[BUFLEN]; 1111 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1112 if (strlen(locked_message_buf) == 0) { 1113 if (found_flag->is_bool() && !has_plus_minus) { 1114 jio_fprintf(defaultStream::error_stream(), 1115 "Missing +/- setting for VM option '%s'\n", argname); 1116 } else if (!found_flag->is_bool() && has_plus_minus) { 1117 jio_fprintf(defaultStream::error_stream(), 1118 "Unexpected +/- setting in VM option '%s'\n", argname); 1119 } else { 1120 jio_fprintf(defaultStream::error_stream(), 1121 "Improperly specified VM option '%s'\n", argname); 1122 } 1123 } else { 1124 #ifdef PRODUCT 1125 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1126 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1127 if (ignore_unrecognized && mismatched) { 1128 return true; 1129 } 1130 #endif 1131 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1132 } 1133 } else { 1134 if (ignore_unrecognized) { 1135 return true; 1136 } 1137 jio_fprintf(defaultStream::error_stream(), 1138 "Unrecognized VM option '%s'\n", argname); 1139 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1140 if (fuzzy_matched != NULL) { 1141 jio_fprintf(defaultStream::error_stream(), 1142 "Did you mean '%s%s%s'? ", 1143 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1144 fuzzy_matched->_name, 1145 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1146 } 1147 } 1148 1149 // allow for commandline "commenting out" options like -XX:#+Verbose 1150 return arg[0] == '#'; 1151 } 1152 1153 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1154 FILE* stream = fopen(file_name, "rb"); 1155 if (stream == NULL) { 1156 if (should_exist) { 1157 jio_fprintf(defaultStream::error_stream(), 1158 "Could not open settings file %s\n", file_name); 1159 return false; 1160 } else { 1161 return true; 1162 } 1163 } 1164 1165 char token[1024]; 1166 int pos = 0; 1167 1168 bool in_white_space = true; 1169 bool in_comment = false; 1170 bool in_quote = false; 1171 char quote_c = 0; 1172 bool result = true; 1173 1174 int c = getc(stream); 1175 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1176 if (in_white_space) { 1177 if (in_comment) { 1178 if (c == '\n') in_comment = false; 1179 } else { 1180 if (c == '#') in_comment = true; 1181 else if (!isspace(c)) { 1182 in_white_space = false; 1183 token[pos++] = c; 1184 } 1185 } 1186 } else { 1187 if (c == '\n' || (!in_quote && isspace(c))) { 1188 // token ends at newline, or at unquoted whitespace 1189 // this allows a way to include spaces in string-valued options 1190 token[pos] = '\0'; 1191 logOption(token); 1192 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1193 build_jvm_flags(token); 1194 pos = 0; 1195 in_white_space = true; 1196 in_quote = false; 1197 } else if (!in_quote && (c == '\'' || c == '"')) { 1198 in_quote = true; 1199 quote_c = c; 1200 } else if (in_quote && (c == quote_c)) { 1201 in_quote = false; 1202 } else { 1203 token[pos++] = c; 1204 } 1205 } 1206 c = getc(stream); 1207 } 1208 if (pos > 0) { 1209 token[pos] = '\0'; 1210 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1211 build_jvm_flags(token); 1212 } 1213 fclose(stream); 1214 return result; 1215 } 1216 1217 //============================================================================================================= 1218 // Parsing of properties (-D) 1219 1220 const char* Arguments::get_property(const char* key) { 1221 return PropertyList_get_value(system_properties(), key); 1222 } 1223 1224 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1225 const char* eq = strchr(prop, '='); 1226 const char* key; 1227 const char* value = ""; 1228 1229 if (eq == NULL) { 1230 // property doesn't have a value, thus use passed string 1231 key = prop; 1232 } else { 1233 // property have a value, thus extract it and save to the 1234 // allocated string 1235 size_t key_len = eq - prop; 1236 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1237 1238 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1239 key = tmp_key; 1240 1241 value = &prop[key_len + 1]; 1242 } 1243 1244 if (strcmp(key, "java.compiler") == 0) { 1245 process_java_compiler_argument(value); 1246 // Record value in Arguments, but let it get passed to Java. 1247 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1248 strcmp(key, "sun.java.launcher.pid") == 0) { 1249 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1250 // private and are processed in process_sun_java_launcher_properties(); 1251 // the sun.java.launcher property is passed on to the java application 1252 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1253 // append is true, writable is true, internal is false 1254 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1255 WriteableProperty, ExternalProperty); 1256 } else { 1257 if (strcmp(key, "sun.java.command") == 0) { 1258 char *old_java_command = _java_command; 1259 _java_command = os::strdup_check_oom(value, mtArguments); 1260 if (old_java_command != NULL) { 1261 os::free(old_java_command); 1262 } 1263 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1264 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1265 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1266 // its value without going through the property list or making a Java call. 1267 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1268 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1269 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1270 os::free((void *)old_java_vendor_url_bug); 1271 } 1272 } 1273 1274 // Create new property and add at the end of the list 1275 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1276 } 1277 1278 if (key != prop) { 1279 // SystemProperty copy passed value, thus free previously allocated 1280 // memory 1281 FreeHeap((void *)key); 1282 } 1283 1284 return true; 1285 } 1286 1287 #if INCLUDE_CDS 1288 void Arguments::check_unsupported_dumping_properties() { 1289 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1290 const char* unsupported_properties[] = { "jdk.module.main", 1291 "jdk.module.limitmods", 1292 "jdk.module.path", 1293 "jdk.module.upgrade.path", 1294 "jdk.module.addmods.0", 1295 "jdk.module.patch.0" }; 1296 const char* unsupported_options[] = { "-m", // cannot use at dump time 1297 "--limit-modules", // ignored at dump time 1298 "--module-path", // ignored at dump time 1299 "--upgrade-module-path", // ignored at dump time 1300 "--add-modules", // ignored at dump time 1301 "--patch-module" // ignored at dump time 1302 }; 1303 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1304 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1305 // vm will exit with an error message. Otherwise, it will print an informational message if 1306 // -Xlog:cds is enabled. 1307 uint info_idx = 1; 1308 SystemProperty* sp = system_properties(); 1309 while (sp != NULL) { 1310 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1311 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1312 if (i < info_idx) { 1313 vm_exit_during_initialization( 1314 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1315 } else { 1316 log_info(cds)("Info: the %s option is ignored when dumping the shared archive", 1317 unsupported_options[i]); 1318 } 1319 } 1320 } 1321 sp = sp->next(); 1322 } 1323 1324 // Check for an exploded module build in use with -Xshare:dump. 1325 if (!has_jimage()) { 1326 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1327 } 1328 } 1329 #endif 1330 1331 //=========================================================================================================== 1332 // Setting int/mixed/comp mode flags 1333 1334 void Arguments::set_mode_flags(Mode mode) { 1335 // Set up default values for all flags. 1336 // If you add a flag to any of the branches below, 1337 // add a default value for it here. 1338 set_java_compiler(false); 1339 _mode = mode; 1340 1341 // Ensure Agent_OnLoad has the correct initial values. 1342 // This may not be the final mode; mode may change later in onload phase. 1343 PropertyList_unique_add(&_system_properties, "java.vm.info", 1344 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1345 1346 UseInterpreter = true; 1347 UseCompiler = true; 1348 UseLoopCounter = true; 1349 1350 // Default values may be platform/compiler dependent - 1351 // use the saved values 1352 ClipInlining = Arguments::_ClipInlining; 1353 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1354 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1355 BackgroundCompilation = Arguments::_BackgroundCompilation; 1356 if (TieredCompilation) { 1357 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1358 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1359 } 1360 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1361 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1362 } 1363 } 1364 1365 // Change from defaults based on mode 1366 switch (mode) { 1367 default: 1368 ShouldNotReachHere(); 1369 break; 1370 case _int: 1371 UseCompiler = false; 1372 UseLoopCounter = false; 1373 AlwaysCompileLoopMethods = false; 1374 UseOnStackReplacement = false; 1375 break; 1376 case _mixed: 1377 // same as default 1378 break; 1379 case _comp: 1380 UseInterpreter = false; 1381 BackgroundCompilation = false; 1382 ClipInlining = false; 1383 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1384 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1385 // compile a level 4 (C2) and then continue executing it. 1386 if (TieredCompilation) { 1387 Tier3InvokeNotifyFreqLog = 0; 1388 Tier4InvocationThreshold = 0; 1389 } 1390 break; 1391 } 1392 } 1393 1394 // Conflict: required to use shared spaces (-Xshare:on), but 1395 // incompatible command line options were chosen. 1396 static void no_shared_spaces(const char* message) { 1397 if (RequireSharedSpaces) { 1398 jio_fprintf(defaultStream::error_stream(), 1399 "Class data sharing is inconsistent with other specified options.\n"); 1400 vm_exit_during_initialization("Unable to use shared archive.", message); 1401 } else { 1402 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1403 } 1404 } 1405 1406 // Returns threshold scaled with the value of scale. 1407 // If scale < 0.0, threshold is returned without scaling. 1408 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1409 if (scale == 1.0 || scale < 0.0) { 1410 return threshold; 1411 } else { 1412 return (intx)(threshold * scale); 1413 } 1414 } 1415 1416 // Returns freq_log scaled with the value of scale. 1417 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1418 // If scale < 0.0, freq_log is returned without scaling. 1419 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1420 // Check if scaling is necessary or if negative value was specified. 1421 if (scale == 1.0 || scale < 0.0) { 1422 return freq_log; 1423 } 1424 // Check values to avoid calculating log2 of 0. 1425 if (scale == 0.0 || freq_log == 0) { 1426 return 0; 1427 } 1428 // Determine the maximum notification frequency value currently supported. 1429 // The largest mask value that the interpreter/C1 can handle is 1430 // of length InvocationCounter::number_of_count_bits. Mask values are always 1431 // one bit shorter then the value of the notification frequency. Set 1432 // max_freq_bits accordingly. 1433 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1434 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1435 if (scaled_freq == 0) { 1436 // Return 0 right away to avoid calculating log2 of 0. 1437 return 0; 1438 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1439 return max_freq_bits; 1440 } else { 1441 return log2_intptr(scaled_freq); 1442 } 1443 } 1444 1445 void Arguments::set_tiered_flags() { 1446 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1447 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1448 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1449 } 1450 if (CompilationPolicyChoice < 2) { 1451 vm_exit_during_initialization( 1452 "Incompatible compilation policy selected", NULL); 1453 } 1454 // Increase the code cache size - tiered compiles a lot more. 1455 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1456 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1457 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1458 } 1459 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1460 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1461 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1462 } 1463 if (!UseInterpreter) { // -Xcomp 1464 Tier3InvokeNotifyFreqLog = 0; 1465 Tier4InvocationThreshold = 0; 1466 } 1467 1468 if (CompileThresholdScaling < 0) { 1469 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1470 } 1471 1472 // Scale tiered compilation thresholds. 1473 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1474 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1475 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1476 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1477 1478 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1479 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1480 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1481 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1482 1483 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1484 // once these thresholds become supported. 1485 1486 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1487 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1488 1489 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1490 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1491 1492 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1493 1494 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1495 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1496 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1497 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1498 } 1499 } 1500 1501 #if INCLUDE_ALL_GCS 1502 static void disable_adaptive_size_policy(const char* collector_name) { 1503 if (UseAdaptiveSizePolicy) { 1504 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1505 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1506 collector_name); 1507 } 1508 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1509 } 1510 } 1511 1512 void Arguments::set_parnew_gc_flags() { 1513 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1514 "control point invariant"); 1515 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1516 1517 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1518 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1519 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1520 } else if (ParallelGCThreads == 0) { 1521 jio_fprintf(defaultStream::error_stream(), 1522 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1523 vm_exit(1); 1524 } 1525 1526 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1527 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1528 // we set them to 1024 and 1024. 1529 // See CR 6362902. 1530 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1531 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1532 } 1533 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1534 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1535 } 1536 1537 // When using compressed oops, we use local overflow stacks, 1538 // rather than using a global overflow list chained through 1539 // the klass word of the object's pre-image. 1540 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1541 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1542 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1543 } 1544 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1545 } 1546 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1547 } 1548 1549 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1550 // sparc/solaris for certain applications, but would gain from 1551 // further optimization and tuning efforts, and would almost 1552 // certainly gain from analysis of platform and environment. 1553 void Arguments::set_cms_and_parnew_gc_flags() { 1554 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1555 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1556 1557 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1558 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1559 1560 set_parnew_gc_flags(); 1561 1562 size_t max_heap = align_down(MaxHeapSize, 1563 CardTableRS::ct_max_alignment_constraint()); 1564 1565 // Now make adjustments for CMS 1566 intx tenuring_default = (intx)6; 1567 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1568 1569 // Preferred young gen size for "short" pauses: 1570 // upper bound depends on # of threads and NewRatio. 1571 const size_t preferred_max_new_size_unaligned = 1572 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1573 size_t preferred_max_new_size = 1574 align_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1575 1576 // Unless explicitly requested otherwise, size young gen 1577 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1578 1579 // If either MaxNewSize or NewRatio is set on the command line, 1580 // assume the user is trying to set the size of the young gen. 1581 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1582 1583 // Set MaxNewSize to our calculated preferred_max_new_size unless 1584 // NewSize was set on the command line and it is larger than 1585 // preferred_max_new_size. 1586 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1587 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1588 } else { 1589 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1590 } 1591 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1592 1593 // Code along this path potentially sets NewSize and OldSize 1594 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1595 min_heap_size(), InitialHeapSize, max_heap); 1596 size_t min_new = preferred_max_new_size; 1597 if (FLAG_IS_CMDLINE(NewSize)) { 1598 min_new = NewSize; 1599 } 1600 if (max_heap > min_new && min_heap_size() > min_new) { 1601 // Unless explicitly requested otherwise, make young gen 1602 // at least min_new, and at most preferred_max_new_size. 1603 if (FLAG_IS_DEFAULT(NewSize)) { 1604 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1605 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1606 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1607 } 1608 // Unless explicitly requested otherwise, size old gen 1609 // so it's NewRatio x of NewSize. 1610 if (FLAG_IS_DEFAULT(OldSize)) { 1611 if (max_heap > NewSize) { 1612 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1613 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1614 } 1615 } 1616 } 1617 } 1618 // Unless explicitly requested otherwise, definitely 1619 // promote all objects surviving "tenuring_default" scavenges. 1620 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1621 FLAG_IS_DEFAULT(SurvivorRatio)) { 1622 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1623 } 1624 // If we decided above (or user explicitly requested) 1625 // `promote all' (via MaxTenuringThreshold := 0), 1626 // prefer minuscule survivor spaces so as not to waste 1627 // space for (non-existent) survivors 1628 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1629 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1630 } 1631 1632 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1633 // but rather the number of free blocks of a given size that are used when 1634 // replenishing the local per-worker free list caches. 1635 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1636 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1637 // OldPLAB sizing manually turned off: Use a larger default setting, 1638 // unless it was manually specified. This is because a too-low value 1639 // will slow down scavenges. 1640 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1641 } else { 1642 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1643 } 1644 } 1645 1646 // If either of the static initialization defaults have changed, note this 1647 // modification. 1648 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1649 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1650 } 1651 1652 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1653 } 1654 #endif // INCLUDE_ALL_GCS 1655 1656 void set_object_alignment() { 1657 // Object alignment. 1658 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1659 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1660 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1661 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1662 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1663 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1664 1665 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1666 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1667 1668 // Oop encoding heap max 1669 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1670 1671 if (SurvivorAlignmentInBytes == 0) { 1672 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1673 } 1674 1675 #if INCLUDE_ALL_GCS 1676 // Set CMS global values 1677 CompactibleFreeListSpace::set_cms_values(); 1678 #endif // INCLUDE_ALL_GCS 1679 } 1680 1681 size_t Arguments::max_heap_for_compressed_oops() { 1682 // Avoid sign flip. 1683 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1684 // We need to fit both the NULL page and the heap into the memory budget, while 1685 // keeping alignment constraints of the heap. To guarantee the latter, as the 1686 // NULL page is located before the heap, we pad the NULL page to the conservative 1687 // maximum alignment that the GC may ever impose upon the heap. 1688 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1689 _conservative_max_heap_alignment); 1690 1691 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1692 NOT_LP64(ShouldNotReachHere(); return 0); 1693 } 1694 1695 void Arguments::set_use_compressed_oops() { 1696 #ifndef ZERO 1697 #ifdef _LP64 1698 // MaxHeapSize is not set up properly at this point, but 1699 // the only value that can override MaxHeapSize if we are 1700 // to use UseCompressedOops is InitialHeapSize. 1701 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1702 1703 if (max_heap_size <= max_heap_for_compressed_oops()) { 1704 #if !defined(COMPILER1) || defined(TIERED) 1705 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1706 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1707 } 1708 #endif 1709 } else { 1710 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1711 warning("Max heap size too large for Compressed Oops"); 1712 FLAG_SET_DEFAULT(UseCompressedOops, false); 1713 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1714 } 1715 } 1716 #endif // _LP64 1717 #endif // ZERO 1718 } 1719 1720 1721 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1722 // set_use_compressed_oops(). 1723 void Arguments::set_use_compressed_klass_ptrs() { 1724 #ifndef ZERO 1725 #ifdef _LP64 1726 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1727 if (!UseCompressedOops) { 1728 if (UseCompressedClassPointers) { 1729 warning("UseCompressedClassPointers requires UseCompressedOops"); 1730 } 1731 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1732 } else { 1733 // Turn on UseCompressedClassPointers too 1734 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1735 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1736 } 1737 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1738 if (UseCompressedClassPointers) { 1739 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1740 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1741 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1742 } 1743 } 1744 } 1745 #endif // _LP64 1746 #endif // !ZERO 1747 } 1748 1749 void Arguments::set_conservative_max_heap_alignment() { 1750 // The conservative maximum required alignment for the heap is the maximum of 1751 // the alignments imposed by several sources: any requirements from the heap 1752 // itself, the collector policy and the maximum page size we may run the VM 1753 // with. 1754 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1755 #if INCLUDE_ALL_GCS 1756 if (UseParallelGC) { 1757 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1758 } else if (UseG1GC) { 1759 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1760 } 1761 #endif // INCLUDE_ALL_GCS 1762 _conservative_max_heap_alignment = MAX4(heap_alignment, 1763 (size_t)os::vm_allocation_granularity(), 1764 os::max_page_size(), 1765 CollectorPolicy::compute_heap_alignment()); 1766 } 1767 1768 bool Arguments::gc_selected() { 1769 #if INCLUDE_ALL_GCS 1770 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1771 #else 1772 return UseSerialGC; 1773 #endif // INCLUDE_ALL_GCS 1774 } 1775 1776 #ifdef TIERED 1777 bool Arguments::compilation_mode_selected() { 1778 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1779 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1780 1781 } 1782 1783 void Arguments::select_compilation_mode_ergonomically() { 1784 #if defined(_WINDOWS) && !defined(_LP64) 1785 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1786 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1787 } 1788 #endif 1789 if (NeverActAsServerClassMachine) { 1790 set_client_compilation_mode(); 1791 } 1792 } 1793 #endif //TIERED 1794 1795 void Arguments::select_gc_ergonomically() { 1796 #if INCLUDE_ALL_GCS 1797 if (os::is_server_class_machine()) { 1798 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1799 } else { 1800 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1801 } 1802 #else 1803 UNSUPPORTED_OPTION(UseG1GC); 1804 UNSUPPORTED_OPTION(UseParallelGC); 1805 UNSUPPORTED_OPTION(UseParallelOldGC); 1806 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1807 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1808 #endif // INCLUDE_ALL_GCS 1809 } 1810 1811 void Arguments::select_gc() { 1812 if (!gc_selected()) { 1813 select_gc_ergonomically(); 1814 if (!gc_selected()) { 1815 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1816 } 1817 } 1818 } 1819 1820 #if INCLUDE_JVMCI 1821 void Arguments::set_jvmci_specific_flags() { 1822 if (UseJVMCICompiler) { 1823 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1824 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1825 } 1826 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1827 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1828 } 1829 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1830 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1831 } 1832 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1833 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1834 } 1835 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1836 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1837 } 1838 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1839 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1840 } 1841 if (TieredStopAtLevel != CompLevel_full_optimization) { 1842 // Currently JVMCI compiler can only work at the full optimization level 1843 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1844 TieredStopAtLevel = CompLevel_full_optimization; 1845 } 1846 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1847 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1848 } 1849 } 1850 } 1851 #endif 1852 1853 void Arguments::set_ergonomics_flags() { 1854 #ifdef TIERED 1855 if (!compilation_mode_selected()) { 1856 select_compilation_mode_ergonomically(); 1857 } 1858 #endif 1859 select_gc(); 1860 1861 #if defined(COMPILER2) || INCLUDE_JVMCI 1862 // Shared spaces work fine with other GCs but causes bytecode rewriting 1863 // to be disabled, which hurts interpreter performance and decreases 1864 // server performance. When -server is specified, keep the default off 1865 // unless it is asked for. Future work: either add bytecode rewriting 1866 // at link time, or rewrite bytecodes in non-shared methods. 1867 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1868 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1869 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1870 } 1871 #endif 1872 1873 set_conservative_max_heap_alignment(); 1874 1875 #ifndef ZERO 1876 #ifdef _LP64 1877 set_use_compressed_oops(); 1878 1879 // set_use_compressed_klass_ptrs() must be called after calling 1880 // set_use_compressed_oops(). 1881 set_use_compressed_klass_ptrs(); 1882 1883 // Also checks that certain machines are slower with compressed oops 1884 // in vm_version initialization code. 1885 #endif // _LP64 1886 #endif // !ZERO 1887 1888 } 1889 1890 void Arguments::set_parallel_gc_flags() { 1891 assert(UseParallelGC || UseParallelOldGC, "Error"); 1892 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1893 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1894 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1895 } 1896 FLAG_SET_DEFAULT(UseParallelGC, true); 1897 1898 // If no heap maximum was requested explicitly, use some reasonable fraction 1899 // of the physical memory, up to a maximum of 1GB. 1900 FLAG_SET_DEFAULT(ParallelGCThreads, 1901 Abstract_VM_Version::parallel_worker_threads()); 1902 if (ParallelGCThreads == 0) { 1903 jio_fprintf(defaultStream::error_stream(), 1904 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1905 vm_exit(1); 1906 } 1907 1908 if (UseAdaptiveSizePolicy) { 1909 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1910 // unless the user actually sets these flags. 1911 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1912 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1913 } 1914 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1915 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1916 } 1917 } 1918 1919 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1920 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1921 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1922 // See CR 6362902 for details. 1923 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1924 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1925 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1926 } 1927 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1928 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1929 } 1930 } 1931 1932 if (UseParallelOldGC) { 1933 // Par compact uses lower default values since they are treated as 1934 // minimums. These are different defaults because of the different 1935 // interpretation and are not ergonomically set. 1936 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1937 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1938 } 1939 } 1940 } 1941 1942 void Arguments::set_g1_gc_flags() { 1943 assert(UseG1GC, "Error"); 1944 #if defined(COMPILER1) || INCLUDE_JVMCI 1945 FastTLABRefill = false; 1946 #endif 1947 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1948 if (ParallelGCThreads == 0) { 1949 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1950 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1951 } 1952 1953 #if INCLUDE_ALL_GCS 1954 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1955 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1956 } 1957 #endif 1958 1959 // MarkStackSize will be set (if it hasn't been set by the user) 1960 // when concurrent marking is initialized. 1961 // Its value will be based upon the number of parallel marking threads. 1962 // But we do set the maximum mark stack size here. 1963 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1964 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1965 } 1966 1967 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1968 // In G1, we want the default GC overhead goal to be higher than 1969 // it is for PS, or the heap might be expanded too aggressively. 1970 // We set it here to ~8%. 1971 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1972 } 1973 1974 // Below, we might need to calculate the pause time interval based on 1975 // the pause target. When we do so we are going to give G1 maximum 1976 // flexibility and allow it to do pauses when it needs to. So, we'll 1977 // arrange that the pause interval to be pause time target + 1 to 1978 // ensure that a) the pause time target is maximized with respect to 1979 // the pause interval and b) we maintain the invariant that pause 1980 // time target < pause interval. If the user does not want this 1981 // maximum flexibility, they will have to set the pause interval 1982 // explicitly. 1983 1984 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1985 // The default pause time target in G1 is 200ms 1986 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1987 } 1988 1989 // Then, if the interval parameter was not set, set it according to 1990 // the pause time target (this will also deal with the case when the 1991 // pause time target is the default value). 1992 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1993 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1994 } 1995 1996 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1997 } 1998 1999 void Arguments::set_gc_specific_flags() { 2000 #if INCLUDE_ALL_GCS 2001 // Set per-collector flags 2002 if (UseParallelGC || UseParallelOldGC) { 2003 set_parallel_gc_flags(); 2004 } else if (UseConcMarkSweepGC) { 2005 set_cms_and_parnew_gc_flags(); 2006 } else if (UseG1GC) { 2007 set_g1_gc_flags(); 2008 } 2009 if (AssumeMP && !UseSerialGC) { 2010 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2011 warning("If the number of processors is expected to increase from one, then" 2012 " you should configure the number of parallel GC threads appropriately" 2013 " using -XX:ParallelGCThreads=N"); 2014 } 2015 } 2016 if (MinHeapFreeRatio == 100) { 2017 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2018 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2019 } 2020 2021 // If class unloading is disabled, also disable concurrent class unloading. 2022 if (!ClassUnloading) { 2023 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2024 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2025 } 2026 #endif // INCLUDE_ALL_GCS 2027 } 2028 2029 julong Arguments::limit_by_allocatable_memory(julong limit) { 2030 julong max_allocatable; 2031 julong result = limit; 2032 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2033 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2034 } 2035 return result; 2036 } 2037 2038 // Use static initialization to get the default before parsing 2039 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2040 2041 void Arguments::set_heap_size() { 2042 julong phys_mem = 2043 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2044 : (julong)MaxRAM; 2045 2046 // Experimental support for CGroup memory limits 2047 if (UseCGroupMemoryLimitForHeap) { 2048 // This is a rough indicator that a CGroup limit may be in force 2049 // for this process 2050 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 2051 FILE *fp = fopen(lim_file, "r"); 2052 if (fp != NULL) { 2053 julong cgroup_max = 0; 2054 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2055 if (ret == 1 && cgroup_max > 0) { 2056 // If unlimited, cgroup_max will be a very large, but unspecified 2057 // value, so use initial phys_mem as a limit 2058 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2059 JULONG_FORMAT "MB) and initial phys_mem (" 2060 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2061 phys_mem = MIN2(cgroup_max, phys_mem); 2062 } else { 2063 warning("Unable to read/parse cgroup memory limit from %s: %s", 2064 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2065 } 2066 fclose(fp); 2067 } else { 2068 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2069 } 2070 } 2071 2072 // If the maximum heap size has not been set with -Xmx, 2073 // then set it as fraction of the size of physical memory, 2074 // respecting the maximum and minimum sizes of the heap. 2075 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2076 julong reasonable_max = phys_mem / MaxRAMFraction; 2077 // The percentage forms of the Initial/Min/Max RAM options override 2078 // the deprecated fractional forms. 2079 if (!FLAG_IS_DEFAULT(MaxRAMPercentage)) 2080 reasonable_max = (phys_mem * MaxRAMPercentage) / 100; 2081 2082 if (!FLAG_IS_DEFAULT(MinRAMPercentage)) { 2083 if (phys_mem <= ((MaxHeapSize * MinRAMPercentage) / 100)) { 2084 // Small physical memory, so use a minimum fraction of it for the heap 2085 reasonable_max = (phys_mem * MinRAMPercentage) / 100; 2086 } else { 2087 // Not-small physical memory, so require a heap at least 2088 // as large as MaxHeapSize 2089 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2090 } 2091 } else { 2092 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2093 // Small physical memory, so use a minimum fraction of it for the heap 2094 reasonable_max = phys_mem / MinRAMFraction; 2095 } else { 2096 // Not-small physical memory, so require a heap at least 2097 // as large as MaxHeapSize 2098 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2099 } 2100 } 2101 2102 2103 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2104 // Limit the heap size to ErgoHeapSizeLimit 2105 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2106 } 2107 if (UseCompressedOops) { 2108 // Limit the heap size to the maximum possible when using compressed oops 2109 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2110 2111 // HeapBaseMinAddress can be greater than default but not less than. 2112 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2113 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2114 // matches compressed oops printing flags 2115 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2116 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2117 DefaultHeapBaseMinAddress, 2118 DefaultHeapBaseMinAddress/G, 2119 HeapBaseMinAddress); 2120 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2121 } 2122 } 2123 2124 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2125 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2126 // but it should be not less than default MaxHeapSize. 2127 max_coop_heap -= HeapBaseMinAddress; 2128 } 2129 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2130 } 2131 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2132 2133 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2134 // An initial heap size was specified on the command line, 2135 // so be sure that the maximum size is consistent. Done 2136 // after call to limit_by_allocatable_memory because that 2137 // method might reduce the allocation size. 2138 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2139 } 2140 2141 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2142 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2143 } 2144 2145 // If the minimum or initial heap_size have not been set or requested to be set 2146 // ergonomically, set them accordingly. 2147 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2148 julong reasonable_minimum = (julong)(OldSize + NewSize); 2149 2150 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2151 2152 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2153 2154 if (InitialHeapSize == 0) { 2155 julong reasonable_initial = phys_mem / InitialRAMFraction; 2156 if (!FLAG_IS_DEFAULT(InitialRAMPercentage)) 2157 reasonable_initial = (phys_mem * InitialRAMPercentage) / 100; 2158 2159 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2160 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2161 2162 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2163 2164 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2165 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2166 } 2167 // If the minimum heap size has not been set (via -Xms), 2168 // synchronize with InitialHeapSize to avoid errors with the default value. 2169 if (min_heap_size() == 0) { 2170 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2171 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2172 } 2173 } 2174 } 2175 2176 // This option inspects the machine and attempts to set various 2177 // parameters to be optimal for long-running, memory allocation 2178 // intensive jobs. It is intended for machines with large 2179 // amounts of cpu and memory. 2180 jint Arguments::set_aggressive_heap_flags() { 2181 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2182 // VM, but we may not be able to represent the total physical memory 2183 // available (like having 8gb of memory on a box but using a 32bit VM). 2184 // Thus, we need to make sure we're using a julong for intermediate 2185 // calculations. 2186 julong initHeapSize; 2187 julong total_memory = os::physical_memory(); 2188 2189 if (total_memory < (julong) 256 * M) { 2190 jio_fprintf(defaultStream::error_stream(), 2191 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2192 vm_exit(1); 2193 } 2194 2195 // The heap size is half of available memory, or (at most) 2196 // all of possible memory less 160mb (leaving room for the OS 2197 // when using ISM). This is the maximum; because adaptive sizing 2198 // is turned on below, the actual space used may be smaller. 2199 2200 initHeapSize = MIN2(total_memory / (julong) 2, 2201 total_memory - (julong) 160 * M); 2202 2203 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2204 2205 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2206 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2207 return JNI_EINVAL; 2208 } 2209 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2210 return JNI_EINVAL; 2211 } 2212 // Currently the minimum size and the initial heap sizes are the same. 2213 set_min_heap_size(initHeapSize); 2214 } 2215 if (FLAG_IS_DEFAULT(NewSize)) { 2216 // Make the young generation 3/8ths of the total heap. 2217 if (FLAG_SET_CMDLINE(size_t, NewSize, 2218 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2219 return JNI_EINVAL; 2220 } 2221 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2222 return JNI_EINVAL; 2223 } 2224 } 2225 2226 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2227 FLAG_SET_DEFAULT(UseLargePages, true); 2228 #endif 2229 2230 // Increase some data structure sizes for efficiency 2231 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2232 return JNI_EINVAL; 2233 } 2234 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2235 return JNI_EINVAL; 2236 } 2237 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2238 return JNI_EINVAL; 2239 } 2240 2241 // See the OldPLABSize comment below, but replace 'after promotion' 2242 // with 'after copying'. YoungPLABSize is the size of the survivor 2243 // space per-gc-thread buffers. The default is 4kw. 2244 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2245 return JNI_EINVAL; 2246 } 2247 2248 // OldPLABSize is the size of the buffers in the old gen that 2249 // UseParallelGC uses to promote live data that doesn't fit in the 2250 // survivor spaces. At any given time, there's one for each gc thread. 2251 // The default size is 1kw. These buffers are rarely used, since the 2252 // survivor spaces are usually big enough. For specjbb, however, there 2253 // are occasions when there's lots of live data in the young gen 2254 // and we end up promoting some of it. We don't have a definite 2255 // explanation for why bumping OldPLABSize helps, but the theory 2256 // is that a bigger PLAB results in retaining something like the 2257 // original allocation order after promotion, which improves mutator 2258 // locality. A minor effect may be that larger PLABs reduce the 2259 // number of PLAB allocation events during gc. The value of 8kw 2260 // was arrived at by experimenting with specjbb. 2261 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2262 return JNI_EINVAL; 2263 } 2264 2265 // Enable parallel GC and adaptive generation sizing 2266 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2267 return JNI_EINVAL; 2268 } 2269 2270 // Encourage steady state memory management 2271 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2272 return JNI_EINVAL; 2273 } 2274 2275 // This appears to improve mutator locality 2276 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2277 return JNI_EINVAL; 2278 } 2279 2280 // Get around early Solaris scheduling bug 2281 // (affinity vs other jobs on system) 2282 // but disallow DR and offlining (5008695). 2283 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2284 return JNI_EINVAL; 2285 } 2286 2287 return JNI_OK; 2288 } 2289 2290 // This must be called after ergonomics. 2291 void Arguments::set_bytecode_flags() { 2292 if (!RewriteBytecodes) { 2293 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2294 } 2295 } 2296 2297 // Aggressive optimization flags -XX:+AggressiveOpts 2298 jint Arguments::set_aggressive_opts_flags() { 2299 #ifdef COMPILER2 2300 if (AggressiveUnboxing) { 2301 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2302 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2303 } else if (!EliminateAutoBox) { 2304 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2305 AggressiveUnboxing = false; 2306 } 2307 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2308 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2309 } else if (!DoEscapeAnalysis) { 2310 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2311 AggressiveUnboxing = false; 2312 } 2313 } 2314 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2315 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2316 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2317 } 2318 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2319 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2320 } 2321 2322 // Feed the cache size setting into the JDK 2323 char buffer[1024]; 2324 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2325 if (!add_property(buffer)) { 2326 return JNI_ENOMEM; 2327 } 2328 } 2329 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2330 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2331 } 2332 #endif 2333 2334 if (AggressiveOpts) { 2335 // Sample flag setting code 2336 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2337 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2338 // } 2339 } 2340 2341 return JNI_OK; 2342 } 2343 2344 //=========================================================================================================== 2345 // Parsing of java.compiler property 2346 2347 void Arguments::process_java_compiler_argument(const char* arg) { 2348 // For backwards compatibility, Djava.compiler=NONE or "" 2349 // causes us to switch to -Xint mode UNLESS -Xdebug 2350 // is also specified. 2351 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2352 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2353 } 2354 } 2355 2356 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2357 _sun_java_launcher = os::strdup_check_oom(launcher); 2358 } 2359 2360 bool Arguments::created_by_java_launcher() { 2361 assert(_sun_java_launcher != NULL, "property must have value"); 2362 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2363 } 2364 2365 bool Arguments::sun_java_launcher_is_altjvm() { 2366 return _sun_java_launcher_is_altjvm; 2367 } 2368 2369 //=========================================================================================================== 2370 // Parsing of main arguments 2371 2372 #if INCLUDE_JVMCI 2373 // Check consistency of jvmci vm argument settings. 2374 bool Arguments::check_jvmci_args_consistency() { 2375 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2376 } 2377 #endif //INCLUDE_JVMCI 2378 2379 // Check consistency of GC selection 2380 bool Arguments::check_gc_consistency() { 2381 // Ensure that the user has not selected conflicting sets 2382 // of collectors. 2383 uint i = 0; 2384 if (UseSerialGC) i++; 2385 if (UseConcMarkSweepGC) i++; 2386 if (UseParallelGC || UseParallelOldGC) i++; 2387 if (UseG1GC) i++; 2388 if (i > 1) { 2389 jio_fprintf(defaultStream::error_stream(), 2390 "Conflicting collector combinations in option list; " 2391 "please refer to the release notes for the combinations " 2392 "allowed\n"); 2393 return false; 2394 } 2395 2396 return true; 2397 } 2398 2399 // Check the consistency of vm_init_args 2400 bool Arguments::check_vm_args_consistency() { 2401 // Method for adding checks for flag consistency. 2402 // The intent is to warn the user of all possible conflicts, 2403 // before returning an error. 2404 // Note: Needs platform-dependent factoring. 2405 bool status = true; 2406 2407 if (TLABRefillWasteFraction == 0) { 2408 jio_fprintf(defaultStream::error_stream(), 2409 "TLABRefillWasteFraction should be a denominator, " 2410 "not " SIZE_FORMAT "\n", 2411 TLABRefillWasteFraction); 2412 status = false; 2413 } 2414 2415 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2416 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2417 } 2418 2419 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2420 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2421 } 2422 2423 if (GCTimeLimit == 100) { 2424 // Turn off gc-overhead-limit-exceeded checks 2425 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2426 } 2427 2428 status = status && check_gc_consistency(); 2429 2430 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2431 // insists that we hold the requisite locks so that the iteration is 2432 // MT-safe. For the verification at start-up and shut-down, we don't 2433 // yet have a good way of acquiring and releasing these locks, 2434 // which are not visible at the CollectedHeap level. We want to 2435 // be able to acquire these locks and then do the iteration rather 2436 // than just disable the lock verification. This will be fixed under 2437 // bug 4788986. 2438 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2439 if (VerifyDuringStartup) { 2440 warning("Heap verification at start-up disabled " 2441 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2442 VerifyDuringStartup = false; // Disable verification at start-up 2443 } 2444 2445 if (VerifyBeforeExit) { 2446 warning("Heap verification at shutdown disabled " 2447 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2448 VerifyBeforeExit = false; // Disable verification at shutdown 2449 } 2450 } 2451 2452 if (PrintNMTStatistics) { 2453 #if INCLUDE_NMT 2454 if (MemTracker::tracking_level() == NMT_off) { 2455 #endif // INCLUDE_NMT 2456 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2457 PrintNMTStatistics = false; 2458 #if INCLUDE_NMT 2459 } 2460 #endif 2461 } 2462 2463 #if INCLUDE_JVMCI 2464 status = status && check_jvmci_args_consistency(); 2465 2466 if (EnableJVMCI) { 2467 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2468 AddProperty, UnwriteableProperty, InternalProperty); 2469 2470 if (!ScavengeRootsInCode) { 2471 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2472 ScavengeRootsInCode = 1; 2473 } 2474 } 2475 #endif 2476 2477 // Check lower bounds of the code cache 2478 // Template Interpreter code is approximately 3X larger in debug builds. 2479 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2480 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2481 jio_fprintf(defaultStream::error_stream(), 2482 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2483 os::vm_page_size()/K); 2484 status = false; 2485 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2486 jio_fprintf(defaultStream::error_stream(), 2487 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2488 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2489 status = false; 2490 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2491 jio_fprintf(defaultStream::error_stream(), 2492 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2493 min_code_cache_size/K); 2494 status = false; 2495 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2496 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2497 jio_fprintf(defaultStream::error_stream(), 2498 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2499 CODE_CACHE_SIZE_LIMIT/M); 2500 status = false; 2501 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2502 jio_fprintf(defaultStream::error_stream(), 2503 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2504 min_code_cache_size/K); 2505 status = false; 2506 } 2507 2508 #ifdef _LP64 2509 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2510 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2511 } 2512 #endif 2513 2514 #ifndef SUPPORT_RESERVED_STACK_AREA 2515 if (StackReservedPages != 0) { 2516 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2517 warning("Reserved Stack Area not supported on this platform"); 2518 } 2519 #endif 2520 2521 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2522 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2523 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2524 } 2525 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2526 } 2527 if (UseCompiler && is_interpreter_only()) { 2528 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2529 warning("UseCompiler disabled due to -Xint."); 2530 } 2531 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2532 } 2533 #ifdef COMPILER2 2534 if (PostLoopMultiversioning && !RangeCheckElimination) { 2535 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2536 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2537 } 2538 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2539 } 2540 #endif 2541 return status; 2542 } 2543 2544 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2545 const char* option_type) { 2546 if (ignore) return false; 2547 2548 const char* spacer = " "; 2549 if (option_type == NULL) { 2550 option_type = ++spacer; // Set both to the empty string. 2551 } 2552 2553 if (os::obsolete_option(option)) { 2554 jio_fprintf(defaultStream::error_stream(), 2555 "Obsolete %s%soption: %s\n", option_type, spacer, 2556 option->optionString); 2557 return false; 2558 } else { 2559 jio_fprintf(defaultStream::error_stream(), 2560 "Unrecognized %s%soption: %s\n", option_type, spacer, 2561 option->optionString); 2562 return true; 2563 } 2564 } 2565 2566 static const char* user_assertion_options[] = { 2567 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2568 }; 2569 2570 static const char* system_assertion_options[] = { 2571 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2572 }; 2573 2574 bool Arguments::parse_uintx(const char* value, 2575 uintx* uintx_arg, 2576 uintx min_size) { 2577 2578 // Check the sign first since atojulong() parses only unsigned values. 2579 bool value_is_positive = !(*value == '-'); 2580 2581 if (value_is_positive) { 2582 julong n; 2583 bool good_return = atojulong(value, &n); 2584 if (good_return) { 2585 bool above_minimum = n >= min_size; 2586 bool value_is_too_large = n > max_uintx; 2587 2588 if (above_minimum && !value_is_too_large) { 2589 *uintx_arg = n; 2590 return true; 2591 } 2592 } 2593 } 2594 return false; 2595 } 2596 2597 unsigned int addreads_count = 0; 2598 unsigned int addexports_count = 0; 2599 unsigned int addopens_count = 0; 2600 unsigned int addmods_count = 0; 2601 unsigned int patch_mod_count = 0; 2602 2603 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2604 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2605 char* property = AllocateHeap(prop_len, mtArguments); 2606 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2607 if (ret < 0 || ret >= (int)prop_len) { 2608 FreeHeap(property); 2609 return false; 2610 } 2611 bool added = add_property(property, UnwriteableProperty, internal); 2612 FreeHeap(property); 2613 return added; 2614 } 2615 2616 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2617 const unsigned int props_count_limit = 1000; 2618 const int max_digits = 3; 2619 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2620 2621 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2622 if (count < props_count_limit) { 2623 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2624 char* property = AllocateHeap(prop_len, mtArguments); 2625 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2626 if (ret < 0 || ret >= (int)prop_len) { 2627 FreeHeap(property); 2628 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2629 return false; 2630 } 2631 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2632 FreeHeap(property); 2633 return added; 2634 } 2635 2636 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2637 return false; 2638 } 2639 2640 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2641 julong* long_arg, 2642 julong min_size, 2643 julong max_size) { 2644 if (!atojulong(s, long_arg)) return arg_unreadable; 2645 return check_memory_size(*long_arg, min_size, max_size); 2646 } 2647 2648 // Parse JavaVMInitArgs structure 2649 2650 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2651 const JavaVMInitArgs *java_options_args, 2652 const JavaVMInitArgs *cmd_line_args) { 2653 bool patch_mod_javabase = false; 2654 2655 // Save default settings for some mode flags 2656 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2657 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2658 Arguments::_ClipInlining = ClipInlining; 2659 Arguments::_BackgroundCompilation = BackgroundCompilation; 2660 if (TieredCompilation) { 2661 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2662 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2663 } 2664 2665 // Setup flags for mixed which is the default 2666 set_mode_flags(_mixed); 2667 2668 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2669 // variable (if present). 2670 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2671 if (result != JNI_OK) { 2672 return result; 2673 } 2674 2675 // Parse args structure generated from the command line flags. 2676 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2677 if (result != JNI_OK) { 2678 return result; 2679 } 2680 2681 // Parse args structure generated from the _JAVA_OPTIONS environment 2682 // variable (if present) (mimics classic VM) 2683 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2684 if (result != JNI_OK) { 2685 return result; 2686 } 2687 2688 // Do final processing now that all arguments have been parsed 2689 result = finalize_vm_init_args(); 2690 if (result != JNI_OK) { 2691 return result; 2692 } 2693 2694 #if INCLUDE_CDS 2695 if (UseSharedSpaces && patch_mod_javabase) { 2696 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 2697 } 2698 #endif 2699 2700 return JNI_OK; 2701 } 2702 2703 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2704 // represents a valid JDWP agent. is_path==true denotes that we 2705 // are dealing with -agentpath (case where name is a path), otherwise with 2706 // -agentlib 2707 bool valid_jdwp_agent(char *name, bool is_path) { 2708 char *_name; 2709 const char *_jdwp = "jdwp"; 2710 size_t _len_jdwp, _len_prefix; 2711 2712 if (is_path) { 2713 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2714 return false; 2715 } 2716 2717 _name++; // skip past last path separator 2718 _len_prefix = strlen(JNI_LIB_PREFIX); 2719 2720 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2721 return false; 2722 } 2723 2724 _name += _len_prefix; 2725 _len_jdwp = strlen(_jdwp); 2726 2727 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2728 _name += _len_jdwp; 2729 } 2730 else { 2731 return false; 2732 } 2733 2734 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2735 return false; 2736 } 2737 2738 return true; 2739 } 2740 2741 if (strcmp(name, _jdwp) == 0) { 2742 return true; 2743 } 2744 2745 return false; 2746 } 2747 2748 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2749 // --patch-module=<module>=<file>(<pathsep><file>)* 2750 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2751 // Find the equal sign between the module name and the path specification 2752 const char* module_equal = strchr(patch_mod_tail, '='); 2753 if (module_equal == NULL) { 2754 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2755 return JNI_ERR; 2756 } else { 2757 // Pick out the module name 2758 size_t module_len = module_equal - patch_mod_tail; 2759 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2760 if (module_name != NULL) { 2761 memcpy(module_name, patch_mod_tail, module_len); 2762 *(module_name + module_len) = '\0'; 2763 // The path piece begins one past the module_equal sign 2764 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2765 FREE_C_HEAP_ARRAY(char, module_name); 2766 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2767 return JNI_ENOMEM; 2768 } 2769 } else { 2770 return JNI_ENOMEM; 2771 } 2772 } 2773 return JNI_OK; 2774 } 2775 2776 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2777 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2778 // The min and max sizes match the values in globals.hpp, but scaled 2779 // with K. The values have been chosen so that alignment with page 2780 // size doesn't change the max value, which makes the conversions 2781 // back and forth between Xss value and ThreadStackSize value easier. 2782 // The values have also been chosen to fit inside a 32-bit signed type. 2783 const julong min_ThreadStackSize = 0; 2784 const julong max_ThreadStackSize = 1 * M; 2785 2786 const julong min_size = min_ThreadStackSize * K; 2787 const julong max_size = max_ThreadStackSize * K; 2788 2789 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2790 2791 julong size = 0; 2792 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2793 if (errcode != arg_in_range) { 2794 bool silent = (option == NULL); // Allow testing to silence error messages 2795 if (!silent) { 2796 jio_fprintf(defaultStream::error_stream(), 2797 "Invalid thread stack size: %s\n", option->optionString); 2798 describe_range_error(errcode); 2799 } 2800 return JNI_EINVAL; 2801 } 2802 2803 // Internally track ThreadStackSize in units of 1024 bytes. 2804 const julong size_aligned = align_up(size, K); 2805 assert(size <= size_aligned, 2806 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2807 size, size_aligned); 2808 2809 const julong size_in_K = size_aligned / K; 2810 assert(size_in_K < (julong)max_intx, 2811 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2812 size_in_K); 2813 2814 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2815 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2816 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2817 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2818 max_expanded, size_in_K); 2819 2820 *out_ThreadStackSize = (intx)size_in_K; 2821 2822 return JNI_OK; 2823 } 2824 2825 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2826 // For match_option to return remaining or value part of option string 2827 const char* tail; 2828 2829 // iterate over arguments 2830 for (int index = 0; index < args->nOptions; index++) { 2831 bool is_absolute_path = false; // for -agentpath vs -agentlib 2832 2833 const JavaVMOption* option = args->options + index; 2834 2835 if (!match_option(option, "-Djava.class.path", &tail) && 2836 !match_option(option, "-Dsun.java.command", &tail) && 2837 !match_option(option, "-Dsun.java.launcher", &tail)) { 2838 2839 // add all jvm options to the jvm_args string. This string 2840 // is used later to set the java.vm.args PerfData string constant. 2841 // the -Djava.class.path and the -Dsun.java.command options are 2842 // omitted from jvm_args string as each have their own PerfData 2843 // string constant object. 2844 build_jvm_args(option->optionString); 2845 } 2846 2847 // -verbose:[class/module/gc/jni] 2848 if (match_option(option, "-verbose", &tail)) { 2849 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2850 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2851 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2852 } else if (!strcmp(tail, ":module")) { 2853 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2854 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2855 } else if (!strcmp(tail, ":gc")) { 2856 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2857 } else if (!strcmp(tail, ":jni")) { 2858 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2859 return JNI_EINVAL; 2860 } 2861 } 2862 // -da / -ea / -disableassertions / -enableassertions 2863 // These accept an optional class/package name separated by a colon, e.g., 2864 // -da:java.lang.Thread. 2865 } else if (match_option(option, user_assertion_options, &tail, true)) { 2866 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2867 if (*tail == '\0') { 2868 JavaAssertions::setUserClassDefault(enable); 2869 } else { 2870 assert(*tail == ':', "bogus match by match_option()"); 2871 JavaAssertions::addOption(tail + 1, enable); 2872 } 2873 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2874 } else if (match_option(option, system_assertion_options, &tail, false)) { 2875 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2876 JavaAssertions::setSystemClassDefault(enable); 2877 // -bootclasspath: 2878 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2879 jio_fprintf(defaultStream::output_stream(), 2880 "-Xbootclasspath is no longer a supported option.\n"); 2881 return JNI_EINVAL; 2882 // -bootclasspath/a: 2883 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2884 Arguments::append_sysclasspath(tail); 2885 // -bootclasspath/p: 2886 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2887 jio_fprintf(defaultStream::output_stream(), 2888 "-Xbootclasspath/p is no longer a supported option.\n"); 2889 return JNI_EINVAL; 2890 // -Xrun 2891 } else if (match_option(option, "-Xrun", &tail)) { 2892 if (tail != NULL) { 2893 const char* pos = strchr(tail, ':'); 2894 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2895 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2896 jio_snprintf(name, len + 1, "%s", tail); 2897 2898 char *options = NULL; 2899 if(pos != NULL) { 2900 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2901 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2902 } 2903 #if !INCLUDE_JVMTI 2904 if (strcmp(name, "jdwp") == 0) { 2905 jio_fprintf(defaultStream::error_stream(), 2906 "Debugging agents are not supported in this VM\n"); 2907 return JNI_ERR; 2908 } 2909 #endif // !INCLUDE_JVMTI 2910 add_init_library(name, options); 2911 } 2912 } else if (match_option(option, "--add-reads=", &tail)) { 2913 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2914 return JNI_ENOMEM; 2915 } 2916 } else if (match_option(option, "--add-exports=", &tail)) { 2917 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2918 return JNI_ENOMEM; 2919 } 2920 } else if (match_option(option, "--add-opens=", &tail)) { 2921 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2922 return JNI_ENOMEM; 2923 } 2924 } else if (match_option(option, "--add-modules=", &tail)) { 2925 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2926 return JNI_ENOMEM; 2927 } 2928 } else if (match_option(option, "--limit-modules=", &tail)) { 2929 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2930 return JNI_ENOMEM; 2931 } 2932 } else if (match_option(option, "--module-path=", &tail)) { 2933 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2934 return JNI_ENOMEM; 2935 } 2936 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2937 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2938 return JNI_ENOMEM; 2939 } 2940 } else if (match_option(option, "--patch-module=", &tail)) { 2941 // --patch-module=<module>=<file>(<pathsep><file>)* 2942 int res = process_patch_mod_option(tail, patch_mod_javabase); 2943 if (res != JNI_OK) { 2944 return res; 2945 } 2946 } else if (match_option(option, "--illegal-access=", &tail)) { 2947 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2948 return JNI_ENOMEM; 2949 } 2950 // -agentlib and -agentpath 2951 } else if (match_option(option, "-agentlib:", &tail) || 2952 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2953 if(tail != NULL) { 2954 const char* pos = strchr(tail, '='); 2955 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2956 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2957 name[len] = '\0'; 2958 2959 char *options = NULL; 2960 if(pos != NULL) { 2961 options = os::strdup_check_oom(pos + 1, mtArguments); 2962 } 2963 #if !INCLUDE_JVMTI 2964 if (valid_jdwp_agent(name, is_absolute_path)) { 2965 jio_fprintf(defaultStream::error_stream(), 2966 "Debugging agents are not supported in this VM\n"); 2967 return JNI_ERR; 2968 } 2969 #endif // !INCLUDE_JVMTI 2970 add_init_agent(name, options, is_absolute_path); 2971 } 2972 // -javaagent 2973 } else if (match_option(option, "-javaagent:", &tail)) { 2974 #if !INCLUDE_JVMTI 2975 jio_fprintf(defaultStream::error_stream(), 2976 "Instrumentation agents are not supported in this VM\n"); 2977 return JNI_ERR; 2978 #else 2979 if (tail != NULL) { 2980 size_t length = strlen(tail) + 1; 2981 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2982 jio_snprintf(options, length, "%s", tail); 2983 add_init_agent("instrument", options, false); 2984 // java agents need module java.instrument 2985 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2986 return JNI_ENOMEM; 2987 } 2988 } 2989 #endif // !INCLUDE_JVMTI 2990 // -Xnoclassgc 2991 } else if (match_option(option, "-Xnoclassgc")) { 2992 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2993 return JNI_EINVAL; 2994 } 2995 // -Xconcgc 2996 } else if (match_option(option, "-Xconcgc")) { 2997 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2998 return JNI_EINVAL; 2999 } 3000 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 3001 // -Xnoconcgc 3002 } else if (match_option(option, "-Xnoconcgc")) { 3003 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 3004 return JNI_EINVAL; 3005 } 3006 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 3007 // -Xbatch 3008 } else if (match_option(option, "-Xbatch")) { 3009 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3010 return JNI_EINVAL; 3011 } 3012 // -Xmn for compatibility with other JVM vendors 3013 } else if (match_option(option, "-Xmn", &tail)) { 3014 julong long_initial_young_size = 0; 3015 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 3016 if (errcode != arg_in_range) { 3017 jio_fprintf(defaultStream::error_stream(), 3018 "Invalid initial young generation size: %s\n", option->optionString); 3019 describe_range_error(errcode); 3020 return JNI_EINVAL; 3021 } 3022 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 3023 return JNI_EINVAL; 3024 } 3025 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 3026 return JNI_EINVAL; 3027 } 3028 // -Xms 3029 } else if (match_option(option, "-Xms", &tail)) { 3030 julong long_initial_heap_size = 0; 3031 // an initial heap size of 0 means automatically determine 3032 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 3033 if (errcode != arg_in_range) { 3034 jio_fprintf(defaultStream::error_stream(), 3035 "Invalid initial heap size: %s\n", option->optionString); 3036 describe_range_error(errcode); 3037 return JNI_EINVAL; 3038 } 3039 set_min_heap_size((size_t)long_initial_heap_size); 3040 // Currently the minimum size and the initial heap sizes are the same. 3041 // Can be overridden with -XX:InitialHeapSize. 3042 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 3043 return JNI_EINVAL; 3044 } 3045 // -Xmx 3046 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 3047 julong long_max_heap_size = 0; 3048 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 3049 if (errcode != arg_in_range) { 3050 jio_fprintf(defaultStream::error_stream(), 3051 "Invalid maximum heap size: %s\n", option->optionString); 3052 describe_range_error(errcode); 3053 return JNI_EINVAL; 3054 } 3055 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 3056 return JNI_EINVAL; 3057 } 3058 // Xmaxf 3059 } else if (match_option(option, "-Xmaxf", &tail)) { 3060 char* err; 3061 int maxf = (int)(strtod(tail, &err) * 100); 3062 if (*err != '\0' || *tail == '\0') { 3063 jio_fprintf(defaultStream::error_stream(), 3064 "Bad max heap free percentage size: %s\n", 3065 option->optionString); 3066 return JNI_EINVAL; 3067 } else { 3068 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 3069 return JNI_EINVAL; 3070 } 3071 } 3072 // Xminf 3073 } else if (match_option(option, "-Xminf", &tail)) { 3074 char* err; 3075 int minf = (int)(strtod(tail, &err) * 100); 3076 if (*err != '\0' || *tail == '\0') { 3077 jio_fprintf(defaultStream::error_stream(), 3078 "Bad min heap free percentage size: %s\n", 3079 option->optionString); 3080 return JNI_EINVAL; 3081 } else { 3082 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3083 return JNI_EINVAL; 3084 } 3085 } 3086 // -Xss 3087 } else if (match_option(option, "-Xss", &tail)) { 3088 intx value = 0; 3089 jint err = parse_xss(option, tail, &value); 3090 if (err != JNI_OK) { 3091 return err; 3092 } 3093 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) { 3094 return JNI_EINVAL; 3095 } 3096 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3097 julong long_CodeCacheExpansionSize = 0; 3098 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3099 if (errcode != arg_in_range) { 3100 jio_fprintf(defaultStream::error_stream(), 3101 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3102 os::vm_page_size()/K); 3103 return JNI_EINVAL; 3104 } 3105 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3106 return JNI_EINVAL; 3107 } 3108 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3109 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3110 julong long_ReservedCodeCacheSize = 0; 3111 3112 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3113 if (errcode != arg_in_range) { 3114 jio_fprintf(defaultStream::error_stream(), 3115 "Invalid maximum code cache size: %s.\n", option->optionString); 3116 return JNI_EINVAL; 3117 } 3118 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3119 return JNI_EINVAL; 3120 } 3121 // -XX:NonNMethodCodeHeapSize= 3122 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3123 julong long_NonNMethodCodeHeapSize = 0; 3124 3125 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3126 if (errcode != arg_in_range) { 3127 jio_fprintf(defaultStream::error_stream(), 3128 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3129 return JNI_EINVAL; 3130 } 3131 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3132 return JNI_EINVAL; 3133 } 3134 // -XX:ProfiledCodeHeapSize= 3135 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3136 julong long_ProfiledCodeHeapSize = 0; 3137 3138 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3139 if (errcode != arg_in_range) { 3140 jio_fprintf(defaultStream::error_stream(), 3141 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3142 return JNI_EINVAL; 3143 } 3144 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3145 return JNI_EINVAL; 3146 } 3147 // -XX:NonProfiledCodeHeapSizee= 3148 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3149 julong long_NonProfiledCodeHeapSize = 0; 3150 3151 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3152 if (errcode != arg_in_range) { 3153 jio_fprintf(defaultStream::error_stream(), 3154 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3155 return JNI_EINVAL; 3156 } 3157 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3158 return JNI_EINVAL; 3159 } 3160 // -green 3161 } else if (match_option(option, "-green")) { 3162 jio_fprintf(defaultStream::error_stream(), 3163 "Green threads support not available\n"); 3164 return JNI_EINVAL; 3165 // -native 3166 } else if (match_option(option, "-native")) { 3167 // HotSpot always uses native threads, ignore silently for compatibility 3168 // -Xrs 3169 } else if (match_option(option, "-Xrs")) { 3170 // Classic/EVM option, new functionality 3171 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3172 return JNI_EINVAL; 3173 } 3174 // -Xprof 3175 } else if (match_option(option, "-Xprof")) { 3176 #if INCLUDE_FPROF 3177 log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release."); 3178 _has_profile = true; 3179 #else // INCLUDE_FPROF 3180 jio_fprintf(defaultStream::error_stream(), 3181 "Flat profiling is not supported in this VM.\n"); 3182 return JNI_ERR; 3183 #endif // INCLUDE_FPROF 3184 // -Xconcurrentio 3185 } else if (match_option(option, "-Xconcurrentio")) { 3186 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3187 return JNI_EINVAL; 3188 } 3189 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3190 return JNI_EINVAL; 3191 } 3192 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3193 return JNI_EINVAL; 3194 } 3195 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3196 return JNI_EINVAL; 3197 } 3198 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3199 return JNI_EINVAL; 3200 } 3201 3202 // -Xinternalversion 3203 } else if (match_option(option, "-Xinternalversion")) { 3204 jio_fprintf(defaultStream::output_stream(), "%s\n", 3205 VM_Version::internal_vm_info_string()); 3206 vm_exit(0); 3207 #ifndef PRODUCT 3208 // -Xprintflags 3209 } else if (match_option(option, "-Xprintflags")) { 3210 CommandLineFlags::printFlags(tty, false); 3211 vm_exit(0); 3212 #endif 3213 // -D 3214 } else if (match_option(option, "-D", &tail)) { 3215 const char* value; 3216 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3217 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3218 // abort if -Djava.endorsed.dirs is set 3219 jio_fprintf(defaultStream::output_stream(), 3220 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3221 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3222 return JNI_EINVAL; 3223 } 3224 if (match_option(option, "-Djava.ext.dirs=", &value) && 3225 *value != '\0' && strcmp(value, "\"\"") != 0) { 3226 // abort if -Djava.ext.dirs is set 3227 jio_fprintf(defaultStream::output_stream(), 3228 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3229 return JNI_EINVAL; 3230 } 3231 // Check for module related properties. They must be set using the modules 3232 // options. For example: use "--add-modules=java.sql", not 3233 // "-Djdk.module.addmods=java.sql" 3234 if (is_internal_module_property(option->optionString + 2)) { 3235 needs_module_property_warning = true; 3236 continue; 3237 } 3238 3239 if (!add_property(tail)) { 3240 return JNI_ENOMEM; 3241 } 3242 // Out of the box management support 3243 if (match_option(option, "-Dcom.sun.management", &tail)) { 3244 #if INCLUDE_MANAGEMENT 3245 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3246 return JNI_EINVAL; 3247 } 3248 // management agent in module jdk.management.agent 3249 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3250 return JNI_ENOMEM; 3251 } 3252 #else 3253 jio_fprintf(defaultStream::output_stream(), 3254 "-Dcom.sun.management is not supported in this VM.\n"); 3255 return JNI_ERR; 3256 #endif 3257 } 3258 // -Xint 3259 } else if (match_option(option, "-Xint")) { 3260 set_mode_flags(_int); 3261 // -Xmixed 3262 } else if (match_option(option, "-Xmixed")) { 3263 set_mode_flags(_mixed); 3264 // -Xcomp 3265 } else if (match_option(option, "-Xcomp")) { 3266 // for testing the compiler; turn off all flags that inhibit compilation 3267 set_mode_flags(_comp); 3268 // -Xshare:dump 3269 } else if (match_option(option, "-Xshare:dump")) { 3270 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3271 return JNI_EINVAL; 3272 } 3273 set_mode_flags(_int); // Prevent compilation, which creates objects 3274 // -Xshare:on 3275 } else if (match_option(option, "-Xshare:on")) { 3276 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3277 return JNI_EINVAL; 3278 } 3279 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3280 return JNI_EINVAL; 3281 } 3282 // -Xshare:auto 3283 } else if (match_option(option, "-Xshare:auto")) { 3284 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3285 return JNI_EINVAL; 3286 } 3287 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3288 return JNI_EINVAL; 3289 } 3290 // -Xshare:off 3291 } else if (match_option(option, "-Xshare:off")) { 3292 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3293 return JNI_EINVAL; 3294 } 3295 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3296 return JNI_EINVAL; 3297 } 3298 // -Xverify 3299 } else if (match_option(option, "-Xverify", &tail)) { 3300 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3301 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3302 return JNI_EINVAL; 3303 } 3304 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3305 return JNI_EINVAL; 3306 } 3307 } else if (strcmp(tail, ":remote") == 0) { 3308 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3309 return JNI_EINVAL; 3310 } 3311 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3312 return JNI_EINVAL; 3313 } 3314 } else if (strcmp(tail, ":none") == 0) { 3315 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3316 return JNI_EINVAL; 3317 } 3318 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3319 return JNI_EINVAL; 3320 } 3321 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3322 return JNI_EINVAL; 3323 } 3324 // -Xdebug 3325 } else if (match_option(option, "-Xdebug")) { 3326 // note this flag has been used, then ignore 3327 set_xdebug_mode(true); 3328 // -Xnoagent 3329 } else if (match_option(option, "-Xnoagent")) { 3330 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3331 } else if (match_option(option, "-Xloggc:", &tail)) { 3332 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3333 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3334 _gc_log_filename = os::strdup_check_oom(tail); 3335 } else if (match_option(option, "-Xlog", &tail)) { 3336 bool ret = false; 3337 if (strcmp(tail, ":help") == 0) { 3338 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3339 vm_exit(0); 3340 } else if (strcmp(tail, ":disable") == 0) { 3341 LogConfiguration::disable_logging(); 3342 ret = true; 3343 } else if (*tail == '\0') { 3344 ret = LogConfiguration::parse_command_line_arguments(); 3345 assert(ret, "-Xlog without arguments should never fail to parse"); 3346 } else if (*tail == ':') { 3347 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3348 } 3349 if (ret == false) { 3350 jio_fprintf(defaultStream::error_stream(), 3351 "Invalid -Xlog option '-Xlog%s'\n", 3352 tail); 3353 return JNI_EINVAL; 3354 } 3355 // JNI hooks 3356 } else if (match_option(option, "-Xcheck", &tail)) { 3357 if (!strcmp(tail, ":jni")) { 3358 #if !INCLUDE_JNI_CHECK 3359 warning("JNI CHECKING is not supported in this VM"); 3360 #else 3361 CheckJNICalls = true; 3362 #endif // INCLUDE_JNI_CHECK 3363 } else if (is_bad_option(option, args->ignoreUnrecognized, 3364 "check")) { 3365 return JNI_EINVAL; 3366 } 3367 } else if (match_option(option, "vfprintf")) { 3368 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3369 } else if (match_option(option, "exit")) { 3370 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3371 } else if (match_option(option, "abort")) { 3372 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3373 // -XX:+AggressiveHeap 3374 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3375 jint result = set_aggressive_heap_flags(); 3376 if (result != JNI_OK) { 3377 return result; 3378 } 3379 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3380 // and the last option wins. 3381 } else if (match_option(option, "-XX:+NeverTenure")) { 3382 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3383 return JNI_EINVAL; 3384 } 3385 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3386 return JNI_EINVAL; 3387 } 3388 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3389 return JNI_EINVAL; 3390 } 3391 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3392 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3393 return JNI_EINVAL; 3394 } 3395 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3396 return JNI_EINVAL; 3397 } 3398 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3399 return JNI_EINVAL; 3400 } 3401 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3402 uintx max_tenuring_thresh = 0; 3403 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3404 jio_fprintf(defaultStream::error_stream(), 3405 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3406 return JNI_EINVAL; 3407 } 3408 3409 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3410 return JNI_EINVAL; 3411 } 3412 3413 if (MaxTenuringThreshold == 0) { 3414 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3415 return JNI_EINVAL; 3416 } 3417 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3418 return JNI_EINVAL; 3419 } 3420 } else { 3421 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3422 return JNI_EINVAL; 3423 } 3424 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3425 return JNI_EINVAL; 3426 } 3427 } 3428 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3429 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3430 return JNI_EINVAL; 3431 } 3432 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3433 return JNI_EINVAL; 3434 } 3435 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3436 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3437 return JNI_EINVAL; 3438 } 3439 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3440 return JNI_EINVAL; 3441 } 3442 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3443 #if defined(DTRACE_ENABLED) 3444 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3445 return JNI_EINVAL; 3446 } 3447 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3448 return JNI_EINVAL; 3449 } 3450 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3451 return JNI_EINVAL; 3452 } 3453 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3454 return JNI_EINVAL; 3455 } 3456 #else // defined(DTRACE_ENABLED) 3457 jio_fprintf(defaultStream::error_stream(), 3458 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3459 return JNI_EINVAL; 3460 #endif // defined(DTRACE_ENABLED) 3461 #ifdef ASSERT 3462 } else if (match_option(option, "-XX:+FullGCALot")) { 3463 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3464 return JNI_EINVAL; 3465 } 3466 // disable scavenge before parallel mark-compact 3467 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3468 return JNI_EINVAL; 3469 } 3470 #endif 3471 #if !INCLUDE_MANAGEMENT 3472 } else if (match_option(option, "-XX:+ManagementServer")) { 3473 jio_fprintf(defaultStream::error_stream(), 3474 "ManagementServer is not supported in this VM.\n"); 3475 return JNI_ERR; 3476 #endif // INCLUDE_MANAGEMENT 3477 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3478 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3479 // already been handled 3480 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3481 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3482 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3483 return JNI_EINVAL; 3484 } 3485 } 3486 // Unknown option 3487 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3488 return JNI_ERR; 3489 } 3490 } 3491 3492 // PrintSharedArchiveAndExit will turn on 3493 // -Xshare:on 3494 // -Xlog:class+path=info 3495 if (PrintSharedArchiveAndExit) { 3496 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3497 return JNI_EINVAL; 3498 } 3499 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3500 return JNI_EINVAL; 3501 } 3502 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3503 } 3504 3505 // Change the default value for flags which have different default values 3506 // when working with older JDKs. 3507 #ifdef LINUX 3508 if (JDK_Version::current().compare_major(6) <= 0 && 3509 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3510 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3511 } 3512 #endif // LINUX 3513 fix_appclasspath(); 3514 return JNI_OK; 3515 } 3516 3517 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3518 // For java.base check for duplicate --patch-module options being specified on the command line. 3519 // This check is only required for java.base, all other duplicate module specifications 3520 // will be checked during module system initialization. The module system initialization 3521 // will throw an ExceptionInInitializerError if this situation occurs. 3522 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3523 if (*patch_mod_javabase) { 3524 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3525 } else { 3526 *patch_mod_javabase = true; 3527 } 3528 } 3529 3530 // Create GrowableArray lazily, only if --patch-module has been specified 3531 if (_patch_mod_prefix == NULL) { 3532 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3533 } 3534 3535 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3536 } 3537 3538 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3539 // 3540 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3541 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3542 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3543 // path is treated as the current directory. 3544 // 3545 // This causes problems with CDS, which requires that all directories specified in the classpath 3546 // must be empty. In most cases, applications do NOT want to load classes from the current 3547 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3548 // scripts compatible with CDS. 3549 void Arguments::fix_appclasspath() { 3550 if (IgnoreEmptyClassPaths) { 3551 const char separator = *os::path_separator(); 3552 const char* src = _java_class_path->value(); 3553 3554 // skip over all the leading empty paths 3555 while (*src == separator) { 3556 src ++; 3557 } 3558 3559 char* copy = os::strdup_check_oom(src, mtArguments); 3560 3561 // trim all trailing empty paths 3562 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3563 *tail = '\0'; 3564 } 3565 3566 char from[3] = {separator, separator, '\0'}; 3567 char to [2] = {separator, '\0'}; 3568 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3569 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3570 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3571 } 3572 3573 _java_class_path->set_writeable_value(copy); 3574 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3575 } 3576 } 3577 3578 static bool has_jar_files(const char* directory) { 3579 DIR* dir = os::opendir(directory); 3580 if (dir == NULL) return false; 3581 3582 struct dirent *entry; 3583 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3584 bool hasJarFile = false; 3585 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3586 const char* name = entry->d_name; 3587 const char* ext = name + strlen(name) - 4; 3588 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3589 } 3590 FREE_C_HEAP_ARRAY(char, dbuf); 3591 os::closedir(dir); 3592 return hasJarFile ; 3593 } 3594 3595 static int check_non_empty_dirs(const char* path) { 3596 const char separator = *os::path_separator(); 3597 const char* const end = path + strlen(path); 3598 int nonEmptyDirs = 0; 3599 while (path < end) { 3600 const char* tmp_end = strchr(path, separator); 3601 if (tmp_end == NULL) { 3602 if (has_jar_files(path)) { 3603 nonEmptyDirs++; 3604 jio_fprintf(defaultStream::output_stream(), 3605 "Non-empty directory: %s\n", path); 3606 } 3607 path = end; 3608 } else { 3609 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3610 memcpy(dirpath, path, tmp_end - path); 3611 dirpath[tmp_end - path] = '\0'; 3612 if (has_jar_files(dirpath)) { 3613 nonEmptyDirs++; 3614 jio_fprintf(defaultStream::output_stream(), 3615 "Non-empty directory: %s\n", dirpath); 3616 } 3617 FREE_C_HEAP_ARRAY(char, dirpath); 3618 path = tmp_end + 1; 3619 } 3620 } 3621 return nonEmptyDirs; 3622 } 3623 3624 jint Arguments::finalize_vm_init_args() { 3625 // check if the default lib/endorsed directory exists; if so, error 3626 char path[JVM_MAXPATHLEN]; 3627 const char* fileSep = os::file_separator(); 3628 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3629 3630 if (CheckEndorsedAndExtDirs) { 3631 int nonEmptyDirs = 0; 3632 // check endorsed directory 3633 nonEmptyDirs += check_non_empty_dirs(path); 3634 // check the extension directories 3635 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3636 if (nonEmptyDirs > 0) { 3637 return JNI_ERR; 3638 } 3639 } 3640 3641 DIR* dir = os::opendir(path); 3642 if (dir != NULL) { 3643 jio_fprintf(defaultStream::output_stream(), 3644 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3645 "in modular form will be supported via the concept of upgradeable modules.\n"); 3646 os::closedir(dir); 3647 return JNI_ERR; 3648 } 3649 3650 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3651 dir = os::opendir(path); 3652 if (dir != NULL) { 3653 jio_fprintf(defaultStream::output_stream(), 3654 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3655 "Use -classpath instead.\n."); 3656 os::closedir(dir); 3657 return JNI_ERR; 3658 } 3659 3660 // This must be done after all arguments have been processed. 3661 // java_compiler() true means set to "NONE" or empty. 3662 if (java_compiler() && !xdebug_mode()) { 3663 // For backwards compatibility, we switch to interpreted mode if 3664 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3665 // not specified. 3666 set_mode_flags(_int); 3667 } 3668 3669 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3670 // but like -Xint, leave compilation thresholds unaffected. 3671 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3672 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3673 set_mode_flags(_int); 3674 } 3675 3676 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3677 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3678 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3679 } 3680 3681 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3682 // Don't degrade server performance for footprint 3683 if (FLAG_IS_DEFAULT(UseLargePages) && 3684 MaxHeapSize < LargePageHeapSizeThreshold) { 3685 // No need for large granularity pages w/small heaps. 3686 // Note that large pages are enabled/disabled for both the 3687 // Java heap and the code cache. 3688 FLAG_SET_DEFAULT(UseLargePages, false); 3689 } 3690 3691 #elif defined(COMPILER2) 3692 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3693 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3694 } 3695 #endif 3696 3697 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3698 UNSUPPORTED_OPTION(ProfileInterpreter); 3699 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3700 #endif 3701 3702 #ifndef TIERED 3703 // Tiered compilation is undefined. 3704 UNSUPPORTED_OPTION(TieredCompilation); 3705 #endif 3706 3707 #if INCLUDE_JVMCI 3708 if (EnableJVMCI && 3709 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3710 return JNI_ENOMEM; 3711 } 3712 #endif 3713 3714 // If we are running in a headless jre, force java.awt.headless property 3715 // to be true unless the property has already been set. 3716 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3717 if (os::is_headless_jre()) { 3718 const char* headless = Arguments::get_property("java.awt.headless"); 3719 if (headless == NULL) { 3720 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3721 if (headless_env == NULL) { 3722 if (!add_property("java.awt.headless=true")) { 3723 return JNI_ENOMEM; 3724 } 3725 } else { 3726 char buffer[256]; 3727 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3728 if (!add_property(buffer)) { 3729 return JNI_ENOMEM; 3730 } 3731 } 3732 } 3733 } 3734 3735 if (!check_vm_args_consistency()) { 3736 return JNI_ERR; 3737 } 3738 3739 #if INCLUDE_JVMCI 3740 if (UseJVMCICompiler) { 3741 Compilation_mode = CompMode_server; 3742 } 3743 #endif 3744 3745 return JNI_OK; 3746 } 3747 3748 // Helper class for controlling the lifetime of JavaVMInitArgs 3749 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3750 // deleted on the destruction of the ScopedVMInitArgs object. 3751 class ScopedVMInitArgs : public StackObj { 3752 private: 3753 JavaVMInitArgs _args; 3754 char* _container_name; 3755 bool _is_set; 3756 char* _vm_options_file_arg; 3757 3758 public: 3759 ScopedVMInitArgs(const char *container_name) { 3760 _args.version = JNI_VERSION_1_2; 3761 _args.nOptions = 0; 3762 _args.options = NULL; 3763 _args.ignoreUnrecognized = false; 3764 _container_name = (char *)container_name; 3765 _is_set = false; 3766 _vm_options_file_arg = NULL; 3767 } 3768 3769 // Populates the JavaVMInitArgs object represented by this 3770 // ScopedVMInitArgs object with the arguments in options. The 3771 // allocated memory is deleted by the destructor. If this method 3772 // returns anything other than JNI_OK, then this object is in a 3773 // partially constructed state, and should be abandoned. 3774 jint set_args(GrowableArray<JavaVMOption>* options) { 3775 _is_set = true; 3776 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3777 JavaVMOption, options->length(), mtArguments); 3778 if (options_arr == NULL) { 3779 return JNI_ENOMEM; 3780 } 3781 _args.options = options_arr; 3782 3783 for (int i = 0; i < options->length(); i++) { 3784 options_arr[i] = options->at(i); 3785 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3786 if (options_arr[i].optionString == NULL) { 3787 // Rely on the destructor to do cleanup. 3788 _args.nOptions = i; 3789 return JNI_ENOMEM; 3790 } 3791 } 3792 3793 _args.nOptions = options->length(); 3794 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3795 return JNI_OK; 3796 } 3797 3798 JavaVMInitArgs* get() { return &_args; } 3799 char* container_name() { return _container_name; } 3800 bool is_set() { return _is_set; } 3801 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3802 char* vm_options_file_arg() { return _vm_options_file_arg; } 3803 3804 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3805 if (_vm_options_file_arg != NULL) { 3806 os::free(_vm_options_file_arg); 3807 } 3808 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3809 } 3810 3811 ~ScopedVMInitArgs() { 3812 if (_vm_options_file_arg != NULL) { 3813 os::free(_vm_options_file_arg); 3814 } 3815 if (_args.options == NULL) return; 3816 for (int i = 0; i < _args.nOptions; i++) { 3817 os::free(_args.options[i].optionString); 3818 } 3819 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3820 } 3821 3822 // Insert options into this option list, to replace option at 3823 // vm_options_file_pos (-XX:VMOptionsFile) 3824 jint insert(const JavaVMInitArgs* args, 3825 const JavaVMInitArgs* args_to_insert, 3826 const int vm_options_file_pos) { 3827 assert(_args.options == NULL, "shouldn't be set yet"); 3828 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3829 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3830 3831 int length = args->nOptions + args_to_insert->nOptions - 1; 3832 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3833 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3834 for (int i = 0; i < args->nOptions; i++) { 3835 if (i == vm_options_file_pos) { 3836 // insert the new options starting at the same place as the 3837 // -XX:VMOptionsFile option 3838 for (int j = 0; j < args_to_insert->nOptions; j++) { 3839 options->push(args_to_insert->options[j]); 3840 } 3841 } else { 3842 options->push(args->options[i]); 3843 } 3844 } 3845 // make into options array 3846 jint result = set_args(options); 3847 delete options; 3848 return result; 3849 } 3850 }; 3851 3852 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3853 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3854 } 3855 3856 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3857 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3858 } 3859 3860 jint Arguments::parse_options_environment_variable(const char* name, 3861 ScopedVMInitArgs* vm_args) { 3862 char *buffer = ::getenv(name); 3863 3864 // Don't check this environment variable if user has special privileges 3865 // (e.g. unix su command). 3866 if (buffer == NULL || os::have_special_privileges()) { 3867 return JNI_OK; 3868 } 3869 3870 if ((buffer = os::strdup(buffer)) == NULL) { 3871 return JNI_ENOMEM; 3872 } 3873 3874 jio_fprintf(defaultStream::error_stream(), 3875 "Picked up %s: %s\n", name, buffer); 3876 3877 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3878 3879 os::free(buffer); 3880 return retcode; 3881 } 3882 3883 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3884 // read file into buffer 3885 int fd = ::open(file_name, O_RDONLY); 3886 if (fd < 0) { 3887 jio_fprintf(defaultStream::error_stream(), 3888 "Could not open options file '%s'\n", 3889 file_name); 3890 return JNI_ERR; 3891 } 3892 3893 struct stat stbuf; 3894 int retcode = os::stat(file_name, &stbuf); 3895 if (retcode != 0) { 3896 jio_fprintf(defaultStream::error_stream(), 3897 "Could not stat options file '%s'\n", 3898 file_name); 3899 os::close(fd); 3900 return JNI_ERR; 3901 } 3902 3903 if (stbuf.st_size == 0) { 3904 // tell caller there is no option data and that is ok 3905 os::close(fd); 3906 return JNI_OK; 3907 } 3908 3909 // '+ 1' for NULL termination even with max bytes 3910 size_t bytes_alloc = stbuf.st_size + 1; 3911 3912 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3913 if (NULL == buf) { 3914 jio_fprintf(defaultStream::error_stream(), 3915 "Could not allocate read buffer for options file parse\n"); 3916 os::close(fd); 3917 return JNI_ENOMEM; 3918 } 3919 3920 memset(buf, 0, bytes_alloc); 3921 3922 // Fill buffer 3923 // Use ::read() instead of os::read because os::read() 3924 // might do a thread state transition 3925 // and it is too early for that here 3926 3927 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3928 os::close(fd); 3929 if (bytes_read < 0) { 3930 FREE_C_HEAP_ARRAY(char, buf); 3931 jio_fprintf(defaultStream::error_stream(), 3932 "Could not read options file '%s'\n", file_name); 3933 return JNI_ERR; 3934 } 3935 3936 if (bytes_read == 0) { 3937 // tell caller there is no option data and that is ok 3938 FREE_C_HEAP_ARRAY(char, buf); 3939 return JNI_OK; 3940 } 3941 3942 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3943 3944 FREE_C_HEAP_ARRAY(char, buf); 3945 return retcode; 3946 } 3947 3948 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3949 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3950 3951 // some pointers to help with parsing 3952 char *buffer_end = buffer + buf_len; 3953 char *opt_hd = buffer; 3954 char *wrt = buffer; 3955 char *rd = buffer; 3956 3957 // parse all options 3958 while (rd < buffer_end) { 3959 // skip leading white space from the input string 3960 while (rd < buffer_end && isspace(*rd)) { 3961 rd++; 3962 } 3963 3964 if (rd >= buffer_end) { 3965 break; 3966 } 3967 3968 // Remember this is where we found the head of the token. 3969 opt_hd = wrt; 3970 3971 // Tokens are strings of non white space characters separated 3972 // by one or more white spaces. 3973 while (rd < buffer_end && !isspace(*rd)) { 3974 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3975 int quote = *rd; // matching quote to look for 3976 rd++; // don't copy open quote 3977 while (rd < buffer_end && *rd != quote) { 3978 // include everything (even spaces) 3979 // up until the close quote 3980 *wrt++ = *rd++; // copy to option string 3981 } 3982 3983 if (rd < buffer_end) { 3984 rd++; // don't copy close quote 3985 } else { 3986 // did not see closing quote 3987 jio_fprintf(defaultStream::error_stream(), 3988 "Unmatched quote in %s\n", name); 3989 delete options; 3990 return JNI_ERR; 3991 } 3992 } else { 3993 *wrt++ = *rd++; // copy to option string 3994 } 3995 } 3996 3997 // steal a white space character and set it to NULL 3998 *wrt++ = '\0'; 3999 // We now have a complete token 4000 4001 JavaVMOption option; 4002 option.optionString = opt_hd; 4003 option.extraInfo = NULL; 4004 4005 options->append(option); // Fill in option 4006 4007 rd++; // Advance to next character 4008 } 4009 4010 // Fill out JavaVMInitArgs structure. 4011 jint status = vm_args->set_args(options); 4012 4013 delete options; 4014 return status; 4015 } 4016 4017 void Arguments::set_shared_spaces_flags() { 4018 if (DumpSharedSpaces) { 4019 if (FailOverToOldVerifier) { 4020 // Don't fall back to the old verifier on verification failure. If a 4021 // class fails verification with the split verifier, it might fail the 4022 // CDS runtime verifier constraint check. In that case, we don't want 4023 // to share the class. We only archive classes that pass the split verifier. 4024 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 4025 } 4026 4027 if (RequireSharedSpaces) { 4028 warning("Cannot dump shared archive while using shared archive"); 4029 } 4030 UseSharedSpaces = false; 4031 #ifdef _LP64 4032 if (!UseCompressedOops || !UseCompressedClassPointers) { 4033 vm_exit_during_initialization( 4034 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 4035 } 4036 } else { 4037 if (!UseCompressedOops || !UseCompressedClassPointers) { 4038 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 4039 } 4040 #endif 4041 } 4042 } 4043 4044 // Sharing support 4045 // Construct the path to the archive 4046 static char* get_shared_archive_path() { 4047 char *shared_archive_path; 4048 if (SharedArchiveFile == NULL) { 4049 char jvm_path[JVM_MAXPATHLEN]; 4050 os::jvm_path(jvm_path, sizeof(jvm_path)); 4051 char *end = strrchr(jvm_path, *os::file_separator()); 4052 if (end != NULL) *end = '\0'; 4053 size_t jvm_path_len = strlen(jvm_path); 4054 size_t file_sep_len = strlen(os::file_separator()); 4055 const size_t len = jvm_path_len + file_sep_len + 20; 4056 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 4057 if (shared_archive_path != NULL) { 4058 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 4059 jvm_path, os::file_separator()); 4060 } 4061 } else { 4062 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 4063 } 4064 return shared_archive_path; 4065 } 4066 4067 #ifndef PRODUCT 4068 // Determine whether LogVMOutput should be implicitly turned on. 4069 static bool use_vm_log() { 4070 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4071 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4072 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4073 PrintAssembly || TraceDeoptimization || TraceDependencies || 4074 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4075 return true; 4076 } 4077 4078 #ifdef COMPILER1 4079 if (PrintC1Statistics) { 4080 return true; 4081 } 4082 #endif // COMPILER1 4083 4084 #ifdef COMPILER2 4085 if (PrintOptoAssembly || PrintOptoStatistics) { 4086 return true; 4087 } 4088 #endif // COMPILER2 4089 4090 return false; 4091 } 4092 4093 #endif // PRODUCT 4094 4095 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4096 for (int index = 0; index < args->nOptions; index++) { 4097 const JavaVMOption* option = args->options + index; 4098 const char* tail; 4099 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4100 return true; 4101 } 4102 } 4103 return false; 4104 } 4105 4106 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4107 const char* vm_options_file, 4108 const int vm_options_file_pos, 4109 ScopedVMInitArgs* vm_options_file_args, 4110 ScopedVMInitArgs* args_out) { 4111 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4112 if (code != JNI_OK) { 4113 return code; 4114 } 4115 4116 if (vm_options_file_args->get()->nOptions < 1) { 4117 return JNI_OK; 4118 } 4119 4120 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4121 jio_fprintf(defaultStream::error_stream(), 4122 "A VM options file may not refer to a VM options file. " 4123 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4124 "options file '%s' in options container '%s' is an error.\n", 4125 vm_options_file_args->vm_options_file_arg(), 4126 vm_options_file_args->container_name()); 4127 return JNI_EINVAL; 4128 } 4129 4130 return args_out->insert(args, vm_options_file_args->get(), 4131 vm_options_file_pos); 4132 } 4133 4134 // Expand -XX:VMOptionsFile found in args_in as needed. 4135 // mod_args and args_out parameters may return values as needed. 4136 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4137 ScopedVMInitArgs* mod_args, 4138 JavaVMInitArgs** args_out) { 4139 jint code = match_special_option_and_act(args_in, mod_args); 4140 if (code != JNI_OK) { 4141 return code; 4142 } 4143 4144 if (mod_args->is_set()) { 4145 // args_in contains -XX:VMOptionsFile and mod_args contains the 4146 // original options from args_in along with the options expanded 4147 // from the VMOptionsFile. Return a short-hand to the caller. 4148 *args_out = mod_args->get(); 4149 } else { 4150 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4151 } 4152 return JNI_OK; 4153 } 4154 4155 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4156 ScopedVMInitArgs* args_out) { 4157 // Remaining part of option string 4158 const char* tail; 4159 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4160 4161 for (int index = 0; index < args->nOptions; index++) { 4162 const JavaVMOption* option = args->options + index; 4163 if (ArgumentsExt::process_options(option)) { 4164 continue; 4165 } 4166 if (match_option(option, "-XX:Flags=", &tail)) { 4167 Arguments::set_jvm_flags_file(tail); 4168 continue; 4169 } 4170 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4171 if (vm_options_file_args.found_vm_options_file_arg()) { 4172 jio_fprintf(defaultStream::error_stream(), 4173 "The option '%s' is already specified in the options " 4174 "container '%s' so the specification of '%s' in the " 4175 "same options container is an error.\n", 4176 vm_options_file_args.vm_options_file_arg(), 4177 vm_options_file_args.container_name(), 4178 option->optionString); 4179 return JNI_EINVAL; 4180 } 4181 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4182 // If there's a VMOptionsFile, parse that 4183 jint code = insert_vm_options_file(args, tail, index, 4184 &vm_options_file_args, args_out); 4185 if (code != JNI_OK) { 4186 return code; 4187 } 4188 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4189 if (args_out->is_set()) { 4190 // The VMOptions file inserted some options so switch 'args' 4191 // to the new set of options, and continue processing which 4192 // preserves "last option wins" semantics. 4193 args = args_out->get(); 4194 // The first option from the VMOptionsFile replaces the 4195 // current option. So we back track to process the 4196 // replacement option. 4197 index--; 4198 } 4199 continue; 4200 } 4201 if (match_option(option, "-XX:+PrintVMOptions")) { 4202 PrintVMOptions = true; 4203 continue; 4204 } 4205 if (match_option(option, "-XX:-PrintVMOptions")) { 4206 PrintVMOptions = false; 4207 continue; 4208 } 4209 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4210 IgnoreUnrecognizedVMOptions = true; 4211 continue; 4212 } 4213 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4214 IgnoreUnrecognizedVMOptions = false; 4215 continue; 4216 } 4217 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4218 CommandLineFlags::printFlags(tty, false); 4219 vm_exit(0); 4220 } 4221 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4222 #if INCLUDE_NMT 4223 // The launcher did not setup nmt environment variable properly. 4224 if (!MemTracker::check_launcher_nmt_support(tail)) { 4225 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4226 } 4227 4228 // Verify if nmt option is valid. 4229 if (MemTracker::verify_nmt_option()) { 4230 // Late initialization, still in single-threaded mode. 4231 if (MemTracker::tracking_level() >= NMT_summary) { 4232 MemTracker::init(); 4233 } 4234 } else { 4235 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4236 } 4237 continue; 4238 #else 4239 jio_fprintf(defaultStream::error_stream(), 4240 "Native Memory Tracking is not supported in this VM\n"); 4241 return JNI_ERR; 4242 #endif 4243 } 4244 4245 #ifndef PRODUCT 4246 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4247 CommandLineFlags::printFlags(tty, true); 4248 vm_exit(0); 4249 } 4250 #endif 4251 } 4252 return JNI_OK; 4253 } 4254 4255 static void print_options(const JavaVMInitArgs *args) { 4256 const char* tail; 4257 for (int index = 0; index < args->nOptions; index++) { 4258 const JavaVMOption *option = args->options + index; 4259 if (match_option(option, "-XX:", &tail)) { 4260 logOption(tail); 4261 } 4262 } 4263 } 4264 4265 bool Arguments::handle_deprecated_print_gc_flags() { 4266 if (PrintGC) { 4267 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4268 } 4269 if (PrintGCDetails) { 4270 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4271 } 4272 4273 if (_gc_log_filename != NULL) { 4274 // -Xloggc was used to specify a filename 4275 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4276 4277 LogTarget(Error, logging) target; 4278 LogStream errstream(target); 4279 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4280 } else if (PrintGC || PrintGCDetails) { 4281 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4282 } 4283 return true; 4284 } 4285 4286 void Arguments::handle_extra_cms_flags(const char* msg) { 4287 SpecialFlag flag; 4288 const char *flag_name = "UseConcMarkSweepGC"; 4289 if (lookup_special_flag(flag_name, flag)) { 4290 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4291 warning("%s", msg); 4292 } 4293 } 4294 4295 // Parse entry point called from JNI_CreateJavaVM 4296 4297 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4298 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4299 4300 // Initialize ranges, constraints and writeables 4301 CommandLineFlagRangeList::init(); 4302 CommandLineFlagConstraintList::init(); 4303 CommandLineFlagWriteableList::init(); 4304 4305 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4306 const char* hotspotrc = ".hotspotrc"; 4307 bool settings_file_specified = false; 4308 bool needs_hotspotrc_warning = false; 4309 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4310 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4311 4312 // Pointers to current working set of containers 4313 JavaVMInitArgs* cur_cmd_args; 4314 JavaVMInitArgs* cur_java_options_args; 4315 JavaVMInitArgs* cur_java_tool_options_args; 4316 4317 // Containers for modified/expanded options 4318 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4319 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4320 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4321 4322 4323 jint code = 4324 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4325 if (code != JNI_OK) { 4326 return code; 4327 } 4328 4329 code = parse_java_options_environment_variable(&initial_java_options_args); 4330 if (code != JNI_OK) { 4331 return code; 4332 } 4333 4334 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4335 &mod_java_tool_options_args, 4336 &cur_java_tool_options_args); 4337 if (code != JNI_OK) { 4338 return code; 4339 } 4340 4341 code = expand_vm_options_as_needed(initial_cmd_args, 4342 &mod_cmd_args, 4343 &cur_cmd_args); 4344 if (code != JNI_OK) { 4345 return code; 4346 } 4347 4348 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4349 &mod_java_options_args, 4350 &cur_java_options_args); 4351 if (code != JNI_OK) { 4352 return code; 4353 } 4354 4355 const char* flags_file = Arguments::get_jvm_flags_file(); 4356 settings_file_specified = (flags_file != NULL); 4357 4358 if (IgnoreUnrecognizedVMOptions) { 4359 cur_cmd_args->ignoreUnrecognized = true; 4360 cur_java_tool_options_args->ignoreUnrecognized = true; 4361 cur_java_options_args->ignoreUnrecognized = true; 4362 } 4363 4364 // Parse specified settings file 4365 if (settings_file_specified) { 4366 if (!process_settings_file(flags_file, true, 4367 cur_cmd_args->ignoreUnrecognized)) { 4368 return JNI_EINVAL; 4369 } 4370 } else { 4371 #ifdef ASSERT 4372 // Parse default .hotspotrc settings file 4373 if (!process_settings_file(".hotspotrc", false, 4374 cur_cmd_args->ignoreUnrecognized)) { 4375 return JNI_EINVAL; 4376 } 4377 #else 4378 struct stat buf; 4379 if (os::stat(hotspotrc, &buf) == 0) { 4380 needs_hotspotrc_warning = true; 4381 } 4382 #endif 4383 } 4384 4385 if (PrintVMOptions) { 4386 print_options(cur_java_tool_options_args); 4387 print_options(cur_cmd_args); 4388 print_options(cur_java_options_args); 4389 } 4390 4391 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4392 jint result = parse_vm_init_args(cur_java_tool_options_args, 4393 cur_java_options_args, 4394 cur_cmd_args); 4395 4396 if (result != JNI_OK) { 4397 return result; 4398 } 4399 4400 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4401 SharedArchivePath = get_shared_archive_path(); 4402 if (SharedArchivePath == NULL) { 4403 return JNI_ENOMEM; 4404 } 4405 4406 // Set up VerifySharedSpaces 4407 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4408 VerifySharedSpaces = true; 4409 } 4410 4411 // Delay warning until here so that we've had a chance to process 4412 // the -XX:-PrintWarnings flag 4413 if (needs_hotspotrc_warning) { 4414 warning("%s file is present but has been ignored. " 4415 "Run with -XX:Flags=%s to load the file.", 4416 hotspotrc, hotspotrc); 4417 } 4418 4419 if (needs_module_property_warning) { 4420 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4421 " names that are reserved for internal use."); 4422 } 4423 4424 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4425 UNSUPPORTED_OPTION(UseLargePages); 4426 #endif 4427 4428 ArgumentsExt::report_unsupported_options(); 4429 4430 #ifndef PRODUCT 4431 if (TraceBytecodesAt != 0) { 4432 TraceBytecodes = true; 4433 } 4434 if (CountCompiledCalls) { 4435 if (UseCounterDecay) { 4436 warning("UseCounterDecay disabled because CountCalls is set"); 4437 UseCounterDecay = false; 4438 } 4439 } 4440 #endif // PRODUCT 4441 4442 if (ScavengeRootsInCode == 0) { 4443 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4444 warning("Forcing ScavengeRootsInCode non-zero"); 4445 } 4446 ScavengeRootsInCode = 1; 4447 } 4448 4449 if (!handle_deprecated_print_gc_flags()) { 4450 return JNI_EINVAL; 4451 } 4452 4453 // Set object alignment values. 4454 set_object_alignment(); 4455 4456 #if !INCLUDE_CDS 4457 if (DumpSharedSpaces || RequireSharedSpaces) { 4458 jio_fprintf(defaultStream::error_stream(), 4459 "Shared spaces are not supported in this VM\n"); 4460 return JNI_ERR; 4461 } 4462 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 4463 log_is_enabled(Info, cds)) { 4464 warning("Shared spaces are not supported in this VM"); 4465 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4466 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4467 } 4468 no_shared_spaces("CDS Disabled"); 4469 #endif // INCLUDE_CDS 4470 4471 return JNI_OK; 4472 } 4473 4474 jint Arguments::apply_ergo() { 4475 // Set flags based on ergonomics. 4476 set_ergonomics_flags(); 4477 4478 #if INCLUDE_JVMCI 4479 set_jvmci_specific_flags(); 4480 #endif 4481 4482 set_shared_spaces_flags(); 4483 4484 #if defined(SPARC) 4485 // BIS instructions require 'membar' instruction regardless of the number 4486 // of CPUs because in virtualized/container environments which might use only 1 4487 // CPU, BIS instructions may produce incorrect results. 4488 4489 if (FLAG_IS_DEFAULT(AssumeMP)) { 4490 FLAG_SET_DEFAULT(AssumeMP, true); 4491 } 4492 #endif 4493 4494 // Check the GC selections again. 4495 if (!check_gc_consistency()) { 4496 return JNI_EINVAL; 4497 } 4498 4499 if (TieredCompilation) { 4500 set_tiered_flags(); 4501 } else { 4502 int max_compilation_policy_choice = 1; 4503 #ifdef COMPILER2 4504 if (is_server_compilation_mode_vm()) { 4505 max_compilation_policy_choice = 2; 4506 } 4507 #endif 4508 // Check if the policy is valid. 4509 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4510 vm_exit_during_initialization( 4511 "Incompatible compilation policy selected", NULL); 4512 } 4513 // Scale CompileThreshold 4514 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4515 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4516 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4517 } 4518 } 4519 4520 #ifdef COMPILER2 4521 #ifndef PRODUCT 4522 if (PrintIdealGraphLevel > 0) { 4523 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4524 } 4525 #endif 4526 #endif 4527 4528 // Set heap size based on available physical memory 4529 set_heap_size(); 4530 4531 ArgumentsExt::set_gc_specific_flags(); 4532 4533 // Initialize Metaspace flags and alignments 4534 Metaspace::ergo_initialize(); 4535 4536 // Set bytecode rewriting flags 4537 set_bytecode_flags(); 4538 4539 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4540 jint code = set_aggressive_opts_flags(); 4541 if (code != JNI_OK) { 4542 return code; 4543 } 4544 4545 // Turn off biased locking for locking debug mode flags, 4546 // which are subtly different from each other but neither works with 4547 // biased locking 4548 if (UseHeavyMonitors 4549 #ifdef COMPILER1 4550 || !UseFastLocking 4551 #endif // COMPILER1 4552 #if INCLUDE_JVMCI 4553 || !JVMCIUseFastLocking 4554 #endif 4555 ) { 4556 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4557 // flag set to true on command line; warn the user that they 4558 // can't enable biased locking here 4559 warning("Biased Locking is not supported with locking debug flags" 4560 "; ignoring UseBiasedLocking flag." ); 4561 } 4562 UseBiasedLocking = false; 4563 } 4564 4565 #ifdef CC_INTERP 4566 // Clear flags not supported on zero. 4567 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4568 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4569 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4570 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4571 #endif // CC_INTERP 4572 4573 #ifdef COMPILER2 4574 if (!EliminateLocks) { 4575 EliminateNestedLocks = false; 4576 } 4577 if (!Inline) { 4578 IncrementalInline = false; 4579 } 4580 #ifndef PRODUCT 4581 if (!IncrementalInline) { 4582 AlwaysIncrementalInline = false; 4583 } 4584 #endif 4585 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4586 // nothing to use the profiling, turn if off 4587 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4588 } 4589 #endif 4590 4591 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4592 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4593 DebugNonSafepoints = true; 4594 } 4595 4596 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4597 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4598 } 4599 4600 if (UseOnStackReplacement && !UseLoopCounter) { 4601 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4602 FLAG_SET_DEFAULT(UseLoopCounter, true); 4603 } 4604 4605 #ifndef PRODUCT 4606 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4607 if (use_vm_log()) { 4608 LogVMOutput = true; 4609 } 4610 } 4611 #endif // PRODUCT 4612 4613 if (PrintCommandLineFlags) { 4614 CommandLineFlags::printSetFlags(tty); 4615 } 4616 4617 // Apply CPU specific policy for the BiasedLocking 4618 if (UseBiasedLocking) { 4619 if (!VM_Version::use_biased_locking() && 4620 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4621 UseBiasedLocking = false; 4622 } 4623 } 4624 #ifdef COMPILER2 4625 if (!UseBiasedLocking || EmitSync != 0) { 4626 UseOptoBiasInlining = false; 4627 } 4628 #endif 4629 4630 return JNI_OK; 4631 } 4632 4633 jint Arguments::adjust_after_os() { 4634 if (UseNUMA) { 4635 if (UseParallelGC || UseParallelOldGC) { 4636 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4637 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4638 } 4639 } 4640 // UseNUMAInterleaving is set to ON for all collectors and 4641 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4642 // such as the parallel collector for Linux and Solaris will 4643 // interleave old gen and survivor spaces on top of NUMA 4644 // allocation policy for the eden space. 4645 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4646 // all platforms and ParallelGC on Windows will interleave all 4647 // of the heap spaces across NUMA nodes. 4648 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4649 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4650 } 4651 } 4652 return JNI_OK; 4653 } 4654 4655 int Arguments::PropertyList_count(SystemProperty* pl) { 4656 int count = 0; 4657 while(pl != NULL) { 4658 count++; 4659 pl = pl->next(); 4660 } 4661 return count; 4662 } 4663 4664 // Return the number of readable properties. 4665 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4666 int count = 0; 4667 while(pl != NULL) { 4668 if (pl->is_readable()) { 4669 count++; 4670 } 4671 pl = pl->next(); 4672 } 4673 return count; 4674 } 4675 4676 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4677 assert(key != NULL, "just checking"); 4678 SystemProperty* prop; 4679 for (prop = pl; prop != NULL; prop = prop->next()) { 4680 if (strcmp(key, prop->key()) == 0) return prop->value(); 4681 } 4682 return NULL; 4683 } 4684 4685 // Return the value of the requested property provided that it is a readable property. 4686 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4687 assert(key != NULL, "just checking"); 4688 SystemProperty* prop; 4689 // Return the property value if the keys match and the property is not internal or 4690 // it's the special internal property "jdk.boot.class.path.append". 4691 for (prop = pl; prop != NULL; prop = prop->next()) { 4692 if (strcmp(key, prop->key()) == 0) { 4693 if (!prop->internal()) { 4694 return prop->value(); 4695 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4696 return prop->value(); 4697 } else { 4698 // Property is internal and not jdk.boot.class.path.append so return NULL. 4699 return NULL; 4700 } 4701 } 4702 } 4703 return NULL; 4704 } 4705 4706 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4707 int count = 0; 4708 const char* ret_val = NULL; 4709 4710 while(pl != NULL) { 4711 if(count >= index) { 4712 ret_val = pl->key(); 4713 break; 4714 } 4715 count++; 4716 pl = pl->next(); 4717 } 4718 4719 return ret_val; 4720 } 4721 4722 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4723 int count = 0; 4724 char* ret_val = NULL; 4725 4726 while(pl != NULL) { 4727 if(count >= index) { 4728 ret_val = pl->value(); 4729 break; 4730 } 4731 count++; 4732 pl = pl->next(); 4733 } 4734 4735 return ret_val; 4736 } 4737 4738 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4739 SystemProperty* p = *plist; 4740 if (p == NULL) { 4741 *plist = new_p; 4742 } else { 4743 while (p->next() != NULL) { 4744 p = p->next(); 4745 } 4746 p->set_next(new_p); 4747 } 4748 } 4749 4750 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4751 bool writeable, bool internal) { 4752 if (plist == NULL) 4753 return; 4754 4755 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4756 PropertyList_add(plist, new_p); 4757 } 4758 4759 void Arguments::PropertyList_add(SystemProperty *element) { 4760 PropertyList_add(&_system_properties, element); 4761 } 4762 4763 // This add maintains unique property key in the list. 4764 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4765 PropertyAppendable append, PropertyWriteable writeable, 4766 PropertyInternal internal) { 4767 if (plist == NULL) 4768 return; 4769 4770 // If property key exist then update with new value. 4771 SystemProperty* prop; 4772 for (prop = *plist; prop != NULL; prop = prop->next()) { 4773 if (strcmp(k, prop->key()) == 0) { 4774 if (append == AppendProperty) { 4775 prop->append_value(v); 4776 } else { 4777 prop->set_value(v); 4778 } 4779 return; 4780 } 4781 } 4782 4783 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4784 } 4785 4786 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4787 // Returns true if all of the source pointed by src has been copied over to 4788 // the destination buffer pointed by buf. Otherwise, returns false. 4789 // Notes: 4790 // 1. If the length (buflen) of the destination buffer excluding the 4791 // NULL terminator character is not long enough for holding the expanded 4792 // pid characters, it also returns false instead of returning the partially 4793 // expanded one. 4794 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4795 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4796 char* buf, size_t buflen) { 4797 const char* p = src; 4798 char* b = buf; 4799 const char* src_end = &src[srclen]; 4800 char* buf_end = &buf[buflen - 1]; 4801 4802 while (p < src_end && b < buf_end) { 4803 if (*p == '%') { 4804 switch (*(++p)) { 4805 case '%': // "%%" ==> "%" 4806 *b++ = *p++; 4807 break; 4808 case 'p': { // "%p" ==> current process id 4809 // buf_end points to the character before the last character so 4810 // that we could write '\0' to the end of the buffer. 4811 size_t buf_sz = buf_end - b + 1; 4812 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4813 4814 // if jio_snprintf fails or the buffer is not long enough to hold 4815 // the expanded pid, returns false. 4816 if (ret < 0 || ret >= (int)buf_sz) { 4817 return false; 4818 } else { 4819 b += ret; 4820 assert(*b == '\0', "fail in copy_expand_pid"); 4821 if (p == src_end && b == buf_end + 1) { 4822 // reach the end of the buffer. 4823 return true; 4824 } 4825 } 4826 p++; 4827 break; 4828 } 4829 default : 4830 *b++ = '%'; 4831 } 4832 } else { 4833 *b++ = *p++; 4834 } 4835 } 4836 *b = '\0'; 4837 return (p == src_end); // return false if not all of the source was copied 4838 }