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