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