1 /* 2 * Copyright (c) 1997, 2016, 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/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "code/codeCacheExtensions.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/logTag.hpp" 37 #include "logging/logConfiguration.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/universe.inline.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "prims/jvmtiExport.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/arguments_ext.hpp" 44 #include "runtime/commandLineFlagConstraintList.hpp" 45 #include "runtime/commandLineFlagRangeList.hpp" 46 #include "runtime/globals.hpp" 47 #include "runtime/globals_extension.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/os.hpp" 50 #include "runtime/vm_version.hpp" 51 #include "services/management.hpp" 52 #include "services/memTracker.hpp" 53 #include "utilities/defaultStream.hpp" 54 #include "utilities/macros.hpp" 55 #include "utilities/stringUtils.hpp" 56 #if INCLUDE_JVMCI 57 #include "jvmci/jvmciRuntime.hpp" 58 #endif 59 #if INCLUDE_ALL_GCS 60 #include "gc/cms/compactibleFreeListSpace.hpp" 61 #include "gc/g1/g1CollectedHeap.inline.hpp" 62 #include "gc/parallel/parallelScavengeHeap.hpp" 63 #endif // INCLUDE_ALL_GCS 64 65 // Note: This is a special bug reporting site for the JVM 66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 67 #define DEFAULT_JAVA_LAUNCHER "generic" 68 69 char* Arguments::_jvm_flags_file = NULL; 70 char** Arguments::_jvm_flags_array = NULL; 71 int Arguments::_num_jvm_flags = 0; 72 char** Arguments::_jvm_args_array = NULL; 73 int Arguments::_num_jvm_args = 0; 74 char* Arguments::_java_command = NULL; 75 SystemProperty* Arguments::_system_properties = NULL; 76 const char* Arguments::_gc_log_filename = NULL; 77 bool Arguments::_has_profile = false; 78 size_t Arguments::_conservative_max_heap_alignment = 0; 79 size_t Arguments::_min_heap_size = 0; 80 Arguments::Mode Arguments::_mode = _mixed; 81 bool Arguments::_java_compiler = false; 82 bool Arguments::_xdebug_mode = false; 83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 85 int Arguments::_sun_java_launcher_pid = -1; 86 bool Arguments::_sun_java_launcher_is_altjvm = false; 87 int Arguments::_patch_dirs_count = 0; 88 char** Arguments::_patch_dirs = NULL; 89 int Arguments::_bootclassloader_append_index = -1; 90 91 // These parameters are reset in method parse_vm_init_args() 92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 94 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 95 bool Arguments::_ClipInlining = ClipInlining; 96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 98 99 char* Arguments::SharedArchivePath = NULL; 100 101 AgentLibraryList Arguments::_libraryList; 102 AgentLibraryList Arguments::_agentList; 103 104 abort_hook_t Arguments::_abort_hook = NULL; 105 exit_hook_t Arguments::_exit_hook = NULL; 106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 107 108 109 SystemProperty *Arguments::_sun_boot_library_path = NULL; 110 SystemProperty *Arguments::_java_library_path = NULL; 111 SystemProperty *Arguments::_java_home = NULL; 112 SystemProperty *Arguments::_java_class_path = NULL; 113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 114 115 PathString *Arguments::_system_boot_class_path = NULL; 116 117 char* Arguments::_ext_dirs = NULL; 118 119 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 120 // part of the option string. 121 static bool match_option(const JavaVMOption *option, const char* name, 122 const char** tail) { 123 size_t len = strlen(name); 124 if (strncmp(option->optionString, name, len) == 0) { 125 *tail = option->optionString + len; 126 return true; 127 } else { 128 return false; 129 } 130 } 131 132 // Check if 'option' matches 'name'. No "tail" is allowed. 133 static bool match_option(const JavaVMOption *option, const char* name) { 134 const char* tail = NULL; 135 bool result = match_option(option, name, &tail); 136 if (tail != NULL && *tail == '\0') { 137 return result; 138 } else { 139 return false; 140 } 141 } 142 143 // Return true if any of the strings in null-terminated array 'names' matches. 144 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 145 // the option must match exactly. 146 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 147 bool tail_allowed) { 148 for (/* empty */; *names != NULL; ++names) { 149 if (match_option(option, *names, tail)) { 150 if (**tail == '\0' || tail_allowed && **tail == ':') { 151 return true; 152 } 153 } 154 } 155 return false; 156 } 157 158 static void logOption(const char* opt) { 159 if (PrintVMOptions) { 160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 161 } 162 } 163 164 // Process java launcher properties. 165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 166 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 167 // sun.java.launcher.pid is defined. 168 // Must do this before setting up other system properties, 169 // as some of them may depend on launcher type. 170 for (int index = 0; index < args->nOptions; index++) { 171 const JavaVMOption* option = args->options + index; 172 const char* tail; 173 174 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 175 process_java_launcher_argument(tail, option->extraInfo); 176 continue; 177 } 178 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 179 if (strcmp(tail, "true") == 0) { 180 _sun_java_launcher_is_altjvm = true; 181 } 182 continue; 183 } 184 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 185 _sun_java_launcher_pid = atoi(tail); 186 continue; 187 } 188 } 189 } 190 191 // Initialize system properties key and value. 192 void Arguments::init_system_properties() { 193 194 // Set up _system_boot_class_path which is not a property but 195 // relies heavily on argument processing and the jdk.boot.class.path.append 196 // property. It is used to store the underlying system boot class path. 197 _system_boot_class_path = new PathString(NULL); 198 199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 200 "Java Virtual Machine Specification", false)); 201 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 202 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 204 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 205 206 // Following are JVMTI agent writable properties. 207 // Properties values are set to NULL and they are 208 // os specific they are initialized in os::init_system_properties_values(). 209 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 210 _java_library_path = new SystemProperty("java.library.path", NULL, true); 211 _java_home = new SystemProperty("java.home", NULL, true); 212 _java_class_path = new SystemProperty("java.class.path", "", true); 213 // jdk.boot.class.path.append is a non-writeable, internal property. 214 // It can only be set by either: 215 // - -Xbootclasspath/a: 216 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 217 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 218 219 // Add to System Property list. 220 PropertyList_add(&_system_properties, _sun_boot_library_path); 221 PropertyList_add(&_system_properties, _java_library_path); 222 PropertyList_add(&_system_properties, _java_home); 223 PropertyList_add(&_system_properties, _java_class_path); 224 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 225 226 // Set OS specific system properties values 227 os::init_system_properties_values(); 228 } 229 230 // Update/Initialize System properties after JDK version number is known 231 void Arguments::init_version_specific_system_properties() { 232 enum { bufsz = 16 }; 233 char buffer[bufsz]; 234 const char* spec_vendor = "Oracle Corporation"; 235 uint32_t spec_version = JDK_Version::current().major_version(); 236 237 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 238 239 PropertyList_add(&_system_properties, 240 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 241 PropertyList_add(&_system_properties, 242 new SystemProperty("java.vm.specification.version", buffer, false)); 243 PropertyList_add(&_system_properties, 244 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 245 } 246 247 /* 248 * -XX argument processing: 249 * 250 * -XX arguments are defined in several places, such as: 251 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 252 * -XX arguments are parsed in parse_argument(). 253 * -XX argument bounds checking is done in check_vm_args_consistency(). 254 * 255 * Over time -XX arguments may change. There are mechanisms to handle common cases: 256 * 257 * ALIASED: An option that is simply another name for another option. This is often 258 * part of the process of deprecating a flag, but not all aliases need 259 * to be deprecated. 260 * 261 * Create an alias for an option by adding the old and new option names to the 262 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 263 * 264 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 265 * support may be removed in the future. Both regular and aliased options may be 266 * deprecated. 267 * 268 * Add a deprecation warning for an option (or alias) by adding an entry in the 269 * "special_jvm_flags" table and setting the "deprecated_in" field. 270 * Often an option "deprecated" in one major release will 271 * be made "obsolete" in the next. In this case the entry should also have it's 272 * "obsolete_in" field set. 273 * 274 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 275 * on the command line. A warning is printed to let the user know that option might not 276 * be accepted in the future. 277 * 278 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 279 * table and setting the "obsolete_in" field. 280 * 281 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 282 * to the current JDK version. The system will flatly refuse to admit the existence of 283 * the flag. This allows a flag to die automatically over JDK releases. 284 * 285 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 286 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 287 * - Newly obsolete or expired deprecated options should have their global variable 288 * definitions removed (from globals.hpp, etc) and related implementations removed. 289 * 290 * Recommended approach for removing options: 291 * 292 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 293 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 294 * 295 * To remove internal options (e.g. diagnostic, experimental, develop options), use 296 * a 2-step model adding major release numbers to the obsolete and expire columns. 297 * 298 * To change the name of an option, use the alias table as well as a 2-step 299 * model adding major release numbers to the deprecate and expire columns. 300 * Think twice about aliasing commonly used customer options. 301 * 302 * There are times when it is appropriate to leave a future release number as undefined. 303 * 304 * Tests: Aliases should be tested in VMAliasOptions.java. 305 * Deprecated options should be tested in VMDeprecatedOptions.java. 306 */ 307 308 // Obsolete or deprecated -XX flag. 309 typedef struct { 310 const char* name; 311 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined"). 312 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined"). 313 JDK_Version expired_in; // When the option expires (or "undefined"). 314 } SpecialFlag; 315 316 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 317 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 318 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 319 // the command-line as usual, but will issue a warning. 320 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 321 // the command-line, while issuing a warning and ignoring the flag value. 322 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 323 // existence of the flag. 324 // 325 // MANUAL CLEANUP ON JDK VERSION UPDATES: 326 // This table ensures that the handling of options will update automatically when the JDK 327 // version is incremented, but the source code needs to be cleanup up manually: 328 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 329 // variable should be removed, as well as users of the variable. 330 // - As "deprecated" options age into "obsolete" options, move the entry into the 331 // "Obsolete Flags" section of the table. 332 // - All expired options should be removed from the table. 333 static SpecialFlag const special_jvm_flags[] = { 334 // -------------- Deprecated Flags -------------- 335 // --- Non-alias flags - sorted by obsolete_in then expired_in: 336 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 337 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 338 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 339 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 340 341 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 342 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 343 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 344 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 345 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 346 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 347 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 348 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 349 350 // -------------- Obsolete Flags - sorted by expired_in -------------- 351 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 352 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 353 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 354 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 355 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 356 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 357 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 358 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 359 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 360 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 361 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 362 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 363 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 364 #ifndef ZERO 365 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 366 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 367 #endif // ZERO 368 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 369 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 370 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 371 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 372 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 373 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 374 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 375 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 376 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 377 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 378 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 379 380 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 381 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 382 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 383 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 384 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 385 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 386 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 387 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 388 #endif 389 390 { NULL, JDK_Version(0), JDK_Version(0) } 391 }; 392 393 // Flags that are aliases for other flags. 394 typedef struct { 395 const char* alias_name; 396 const char* real_name; 397 } AliasedFlag; 398 399 static AliasedFlag const aliased_jvm_flags[] = { 400 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 401 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 402 { "CMSMarkStackSize", "MarkStackSize" }, 403 { "G1MarkStackSize", "MarkStackSize" }, 404 { "ParallelMarkingThreads", "ConcGCThreads" }, 405 { "ParallelCMSThreads", "ConcGCThreads" }, 406 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 407 { NULL, NULL} 408 }; 409 410 static AliasedLoggingFlag const aliased_logging_flags[] = { 411 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 412 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(classload) }, 413 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(classload, preorder) }, 414 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(classpath) }, 415 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(classresolve) }, 416 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(classunload) }, 417 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 418 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(classload, constraints) }, 419 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 420 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepointcleanup) }, 421 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 422 }; 423 424 #ifndef PRODUCT 425 // These options are removed in jdk9. Remove this code for jdk10. 426 static AliasedFlag const removed_develop_logging_flags[] = { 427 { "TraceClassInitialization", "-Xlog:classinit" }, 428 { "TraceClassLoaderData", "-Xlog:classloaderdata" }, 429 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 430 { "TraceItables", "-Xlog:itables=debug" }, 431 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 432 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 433 { "TraceStartupTime", "-Xlog:startuptime" }, 434 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 435 { "PrintVtables", "-Xlog:vtables=debug" }, 436 { "VerboseVerification", "-Xlog:verification" }, 437 { NULL, NULL } 438 }; 439 #endif //PRODUCT 440 441 // Return true if "v" is less than "other", where "other" may be "undefined". 442 static bool version_less_than(JDK_Version v, JDK_Version other) { 443 assert(!v.is_undefined(), "must be defined"); 444 if (!other.is_undefined() && v.compare(other) >= 0) { 445 return false; 446 } else { 447 return true; 448 } 449 } 450 451 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 452 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 453 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 454 flag = special_jvm_flags[i]; 455 return true; 456 } 457 } 458 return false; 459 } 460 461 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 462 assert(version != NULL, "Must provide a version buffer"); 463 SpecialFlag flag; 464 if (lookup_special_flag(flag_name, flag)) { 465 if (!flag.obsolete_in.is_undefined()) { 466 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 467 *version = flag.obsolete_in; 468 return true; 469 } 470 } 471 } 472 return false; 473 } 474 475 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 476 assert(version != NULL, "Must provide a version buffer"); 477 SpecialFlag flag; 478 if (lookup_special_flag(flag_name, flag)) { 479 if (!flag.deprecated_in.is_undefined()) { 480 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 481 version_less_than(JDK_Version::current(), flag.expired_in)) { 482 *version = flag.deprecated_in; 483 return 1; 484 } else { 485 return -1; 486 } 487 } 488 } 489 return 0; 490 } 491 492 #ifndef PRODUCT 493 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 494 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 495 const AliasedFlag& flag = removed_develop_logging_flags[i]; 496 if (strcmp(flag.alias_name, name) == 0) { 497 return flag.real_name; 498 } 499 } 500 return NULL; 501 } 502 #endif // PRODUCT 503 504 const char* Arguments::real_flag_name(const char *flag_name) { 505 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 506 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 507 if (strcmp(flag_status.alias_name, flag_name) == 0) { 508 return flag_status.real_name; 509 } 510 } 511 return flag_name; 512 } 513 514 #ifdef ASSERT 515 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 516 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 517 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 518 return true; 519 } 520 } 521 return false; 522 } 523 524 static bool verify_special_jvm_flags() { 525 bool success = true; 526 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 527 const SpecialFlag& flag = special_jvm_flags[i]; 528 if (lookup_special_flag(flag.name, i)) { 529 warning("Duplicate special flag declaration \"%s\"", flag.name); 530 success = false; 531 } 532 if (flag.deprecated_in.is_undefined() && 533 flag.obsolete_in.is_undefined()) { 534 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 535 success = false; 536 } 537 538 if (!flag.deprecated_in.is_undefined()) { 539 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 540 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 541 success = false; 542 } 543 544 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 545 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 546 success = false; 547 } 548 } 549 550 if (!flag.obsolete_in.is_undefined()) { 551 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 552 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 553 success = false; 554 } 555 556 // if flag has become obsolete it should not have a "globals" flag defined anymore. 557 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 558 if (Flag::find_flag(flag.name) != NULL) { 559 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 560 success = false; 561 } 562 } 563 } 564 565 if (!flag.expired_in.is_undefined()) { 566 // if flag has become expired it should not have a "globals" flag defined anymore. 567 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 568 if (Flag::find_flag(flag.name) != NULL) { 569 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 570 success = false; 571 } 572 } 573 } 574 575 } 576 return success; 577 } 578 #endif 579 580 // Constructs the system boot class path from the following components, in order: 581 // 582 // prefix // from -Xpatch:... 583 // base // from os::get_system_properties() 584 // suffix // from -Xbootclasspath/a:... 585 // 586 // This could be AllStatic, but it isn't needed after argument processing is 587 // complete. After argument processing, the combined components are copied 588 // to Arguments::_system_boot_class_path via a call to Arguments::set_sysclasspath. 589 class ArgumentBootClassPath: public StackObj { 590 public: 591 ArgumentBootClassPath(const char* base); 592 ~ArgumentBootClassPath(); 593 594 inline void set_base(const char* base); 595 inline void add_prefix(const char* prefix); 596 inline void add_suffix_to_prefix(const char* suffix); 597 inline void add_suffix(const char* suffix); 598 inline void reset_path(const char* base); 599 600 inline const char* get_base() const { return _items[_bcp_base]; } 601 inline const char* get_prefix() const { return _items[_bcp_prefix]; } 602 inline const char* get_suffix() const { return _items[_bcp_suffix]; } 603 604 // Combine all the components into a single c-heap-allocated string; caller 605 // must free the string if/when no longer needed. 606 char* combined_path(); 607 608 private: 609 // Utility routines. 610 static char* add_to_path(const char* path, const char* str, bool prepend); 611 static char* add_jars_to_path(char* path, const char* directory); 612 613 inline void reset_item_at(int index); 614 615 // Array indices for the items that make up the sysclasspath. All except the 616 // base are allocated in the C heap and freed by this class. 617 enum { 618 _bcp_prefix, // was -Xpatch:... 619 _bcp_base, // the default system boot class path 620 _bcp_suffix, // from -Xbootclasspath/a:... 621 _bcp_nitems // the number of items, must be last. 622 }; 623 624 const char* _items[_bcp_nitems]; 625 }; 626 627 ArgumentBootClassPath::ArgumentBootClassPath(const char* base) { 628 memset(_items, 0, sizeof(_items)); 629 _items[_bcp_base] = base; 630 } 631 632 ArgumentBootClassPath::~ArgumentBootClassPath() { 633 // Free everything except the base. 634 for (int i = 0; i < _bcp_nitems; ++i) { 635 if (i != _bcp_base) reset_item_at(i); 636 } 637 } 638 639 inline void ArgumentBootClassPath::set_base(const char* base) { 640 _items[_bcp_base] = base; 641 } 642 643 inline void ArgumentBootClassPath::add_prefix(const char* prefix) { 644 _items[_bcp_prefix] = add_to_path(_items[_bcp_prefix], prefix, true); 645 } 646 647 inline void ArgumentBootClassPath::add_suffix_to_prefix(const char* suffix) { 648 _items[_bcp_prefix] = add_to_path(_items[_bcp_prefix], suffix, false); 649 } 650 651 inline void ArgumentBootClassPath::add_suffix(const char* suffix) { 652 _items[_bcp_suffix] = add_to_path(_items[_bcp_suffix], suffix, false); 653 } 654 655 inline void ArgumentBootClassPath::reset_item_at(int index) { 656 assert(index < _bcp_nitems && index != _bcp_base, "just checking"); 657 if (_items[index] != NULL) { 658 FREE_C_HEAP_ARRAY(char, _items[index]); 659 _items[index] = NULL; 660 } 661 } 662 663 inline void ArgumentBootClassPath::reset_path(const char* base) { 664 // Clear the prefix and suffix. 665 reset_item_at(_bcp_prefix); 666 reset_item_at(_bcp_suffix); 667 set_base(base); 668 } 669 670 //------------------------------------------------------------------------------ 671 672 673 // Combine the bootclasspath elements, some of which may be null, into a single 674 // c-heap-allocated string. 675 char* ArgumentBootClassPath::combined_path() { 676 assert(_items[_bcp_base] != NULL, "empty default sysclasspath"); 677 678 size_t lengths[_bcp_nitems]; 679 size_t total_len = 0; 680 681 const char separator = *os::path_separator(); 682 683 // Get the lengths. 684 int i; 685 for (i = 0; i < _bcp_nitems; ++i) { 686 if (i == _bcp_suffix) { 687 // Record index of boot loader's append path. 688 Arguments::set_bootclassloader_append_index((int)total_len); 689 } 690 if (_items[i] != NULL) { 691 lengths[i] = strlen(_items[i]); 692 // Include space for the separator char (or a NULL for the last item). 693 total_len += lengths[i] + 1; 694 } 695 } 696 assert(total_len > 0, "empty sysclasspath not allowed"); 697 698 // Copy the _items to a single string. 699 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 700 char* cp_tmp = cp; 701 for (i = 0; i < _bcp_nitems; ++i) { 702 if (_items[i] != NULL) { 703 memcpy(cp_tmp, _items[i], lengths[i]); 704 cp_tmp += lengths[i]; 705 *cp_tmp++ = separator; 706 } 707 } 708 *--cp_tmp = '\0'; // Replace the extra separator. 709 return cp; 710 } 711 712 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 713 char* 714 ArgumentBootClassPath::add_to_path(const char* path, const char* str, bool prepend) { 715 char *cp; 716 717 assert(str != NULL, "just checking"); 718 if (path == NULL) { 719 size_t len = strlen(str) + 1; 720 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 721 memcpy(cp, str, len); // copy the trailing null 722 } else { 723 const char separator = *os::path_separator(); 724 size_t old_len = strlen(path); 725 size_t str_len = strlen(str); 726 size_t len = old_len + str_len + 2; 727 728 if (prepend) { 729 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 730 char* cp_tmp = cp; 731 memcpy(cp_tmp, str, str_len); 732 cp_tmp += str_len; 733 *cp_tmp = separator; 734 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 735 FREE_C_HEAP_ARRAY(char, path); 736 } else { 737 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 738 char* cp_tmp = cp + old_len; 739 *cp_tmp = separator; 740 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 741 } 742 } 743 return cp; 744 } 745 746 // Scan the directory and append any jar or zip files found to path. 747 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 748 char* ArgumentBootClassPath::add_jars_to_path(char* path, const char* directory) { 749 DIR* dir = os::opendir(directory); 750 if (dir == NULL) return path; 751 752 char dir_sep[2] = { '\0', '\0' }; 753 size_t directory_len = strlen(directory); 754 const char fileSep = *os::file_separator(); 755 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 756 757 /* Scan the directory for jars/zips, appending them to path. */ 758 struct dirent *entry; 759 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 760 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 761 const char* name = entry->d_name; 762 const char* ext = name + strlen(name) - 4; 763 bool isJarOrZip = ext > name && 764 (os::file_name_strcmp(ext, ".jar") == 0 || 765 os::file_name_strcmp(ext, ".zip") == 0); 766 if (isJarOrZip) { 767 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 768 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 769 path = add_to_path(path, jarpath, false); 770 FREE_C_HEAP_ARRAY(char, jarpath); 771 } 772 } 773 FREE_C_HEAP_ARRAY(char, dbuf); 774 os::closedir(dir); 775 return path; 776 } 777 778 // Parses a memory size specification string. 779 static bool atomull(const char *s, julong* result) { 780 julong n = 0; 781 int args_read = 0; 782 bool is_hex = false; 783 // Skip leading 0[xX] for hexadecimal 784 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 785 s += 2; 786 is_hex = true; 787 args_read = sscanf(s, JULONG_FORMAT_X, &n); 788 } else { 789 args_read = sscanf(s, JULONG_FORMAT, &n); 790 } 791 if (args_read != 1) { 792 return false; 793 } 794 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 795 s++; 796 } 797 // 4705540: illegal if more characters are found after the first non-digit 798 if (strlen(s) > 1) { 799 return false; 800 } 801 switch (*s) { 802 case 'T': case 't': 803 *result = n * G * K; 804 // Check for overflow. 805 if (*result/((julong)G * K) != n) return false; 806 return true; 807 case 'G': case 'g': 808 *result = n * G; 809 if (*result/G != n) return false; 810 return true; 811 case 'M': case 'm': 812 *result = n * M; 813 if (*result/M != n) return false; 814 return true; 815 case 'K': case 'k': 816 *result = n * K; 817 if (*result/K != n) return false; 818 return true; 819 case '\0': 820 *result = n; 821 return true; 822 default: 823 return false; 824 } 825 } 826 827 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 828 if (size < min_size) return arg_too_small; 829 // Check that size will fit in a size_t (only relevant on 32-bit) 830 if (size > max_uintx) return arg_too_big; 831 return arg_in_range; 832 } 833 834 // Describe an argument out of range error 835 void Arguments::describe_range_error(ArgsRange errcode) { 836 switch(errcode) { 837 case arg_too_big: 838 jio_fprintf(defaultStream::error_stream(), 839 "The specified size exceeds the maximum " 840 "representable size.\n"); 841 break; 842 case arg_too_small: 843 case arg_unreadable: 844 case arg_in_range: 845 // do nothing for now 846 break; 847 default: 848 ShouldNotReachHere(); 849 } 850 } 851 852 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 853 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 854 return true; 855 } else { 856 return false; 857 } 858 } 859 860 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 861 char* end; 862 errno = 0; 863 double v = strtod(value, &end); 864 if ((errno != 0) || (*end != 0)) { 865 return false; 866 } 867 868 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 869 return true; 870 } 871 return false; 872 } 873 874 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 875 julong v; 876 int int_v; 877 intx intx_v; 878 bool is_neg = false; 879 Flag* result = Flag::find_flag(name, strlen(name)); 880 881 if (result == NULL) { 882 return false; 883 } 884 885 // Check the sign first since atomull() parses only unsigned values. 886 if (*value == '-') { 887 if (!result->is_intx() && !result->is_int()) { 888 return false; 889 } 890 value++; 891 is_neg = true; 892 } 893 if (!atomull(value, &v)) { 894 return false; 895 } 896 if (result->is_int()) { 897 int_v = (int) v; 898 if (is_neg) { 899 int_v = -int_v; 900 } 901 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 902 } else if (result->is_uint()) { 903 uint uint_v = (uint) v; 904 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 905 } else if (result->is_intx()) { 906 intx_v = (intx) v; 907 if (is_neg) { 908 intx_v = -intx_v; 909 } 910 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 911 } else if (result->is_uintx()) { 912 uintx uintx_v = (uintx) v; 913 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 914 } else if (result->is_uint64_t()) { 915 uint64_t uint64_t_v = (uint64_t) v; 916 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 917 } else if (result->is_size_t()) { 918 size_t size_t_v = (size_t) v; 919 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 920 } else { 921 return false; 922 } 923 } 924 925 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 926 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 927 // Contract: CommandLineFlags always returns a pointer that needs freeing. 928 FREE_C_HEAP_ARRAY(char, value); 929 return true; 930 } 931 932 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 933 const char* old_value = ""; 934 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 935 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 936 size_t new_len = strlen(new_value); 937 const char* value; 938 char* free_this_too = NULL; 939 if (old_len == 0) { 940 value = new_value; 941 } else if (new_len == 0) { 942 value = old_value; 943 } else { 944 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 945 // each new setting adds another LINE to the switch: 946 sprintf(buf, "%s\n%s", old_value, new_value); 947 value = buf; 948 free_this_too = buf; 949 } 950 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 951 // CommandLineFlags always returns a pointer that needs freeing. 952 FREE_C_HEAP_ARRAY(char, value); 953 if (free_this_too != NULL) { 954 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 955 FREE_C_HEAP_ARRAY(char, free_this_too); 956 } 957 return true; 958 } 959 960 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 961 const char* real_name = real_flag_name(arg); 962 JDK_Version since = JDK_Version(); 963 switch (is_deprecated_flag(arg, &since)) { 964 case -1: 965 return NULL; // obsolete or expired, don't process normally 966 case 0: 967 return real_name; 968 case 1: { 969 if (warn) { 970 char version[256]; 971 since.to_string(version, sizeof(version)); 972 if (real_name != arg) { 973 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 974 arg, version, real_name); 975 } else { 976 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 977 arg, version); 978 } 979 } 980 return real_name; 981 } 982 } 983 ShouldNotReachHere(); 984 return NULL; 985 } 986 987 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 988 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 989 // Set tagset string buffer at max size of 256, large enough for any alias tagset 990 const int max_tagset_size = 256; 991 int max_tagset_len = max_tagset_size - 1; 992 char tagset_buffer[max_tagset_size]; 993 tagset_buffer[0] = '\0'; 994 995 // Write tag-set for aliased logging option, in string list form 996 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 997 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 998 if (i > 0) { 999 strncat(tagset_buffer, ",", max_tagset_len - strlen(tagset_buffer)); 1000 } 1001 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 1002 } 1003 1004 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 1005 (on) ? "+" : "-", 1006 name, 1007 tagset_buffer, 1008 (on) ? LogLevel::name(alf.level) : "off"); 1009 } 1010 1011 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 1012 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1013 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1014 if (strcmp(alf.alias_name, name) == 0) { 1015 log_deprecated_flag(name, on, alf); 1016 return alf; 1017 } 1018 } 1019 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1020 return a; 1021 } 1022 1023 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 1024 1025 // range of acceptable characters spelled out for portability reasons 1026 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1027 #define BUFLEN 255 1028 char name[BUFLEN+1]; 1029 char dummy; 1030 const char* real_name; 1031 bool warn_if_deprecated = true; 1032 1033 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1034 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1035 if (alf.alias_name != NULL){ 1036 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1037 return true; 1038 } 1039 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1040 if (real_name == NULL) { 1041 return false; 1042 } 1043 return set_bool_flag(real_name, false, origin); 1044 } 1045 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1046 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1047 if (alf.alias_name != NULL){ 1048 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1049 return true; 1050 } 1051 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1052 if (real_name == NULL) { 1053 return false; 1054 } 1055 return set_bool_flag(real_name, true, origin); 1056 } 1057 1058 char punct; 1059 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1060 const char* value = strchr(arg, '=') + 1; 1061 Flag* flag; 1062 1063 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1064 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1065 if (real_name == NULL) { 1066 return false; 1067 } 1068 flag = Flag::find_flag(real_name); 1069 if (flag != NULL && flag->is_ccstr()) { 1070 if (flag->ccstr_accumulates()) { 1071 return append_to_string_flag(real_name, value, origin); 1072 } else { 1073 if (value[0] == '\0') { 1074 value = NULL; 1075 } 1076 return set_string_flag(real_name, value, origin); 1077 } 1078 } else { 1079 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1080 } 1081 } 1082 1083 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1084 const char* value = strchr(arg, '=') + 1; 1085 // -XX:Foo:=xxx will reset the string flag to the given value. 1086 if (value[0] == '\0') { 1087 value = NULL; 1088 } 1089 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1090 if (real_name == NULL) { 1091 return false; 1092 } 1093 return set_string_flag(real_name, value, origin); 1094 } 1095 1096 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1097 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1098 #define NUMBER_RANGE "[0123456789eE+-]" 1099 char value[BUFLEN + 1]; 1100 char value2[BUFLEN + 1]; 1101 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1102 // Looks like a floating-point number -- try again with more lenient format string 1103 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1104 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1105 if (real_name == NULL) { 1106 return false; 1107 } 1108 return set_fp_numeric_flag(real_name, value, origin); 1109 } 1110 } 1111 1112 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1113 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1114 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1115 if (real_name == NULL) { 1116 return false; 1117 } 1118 return set_numeric_flag(real_name, value, origin); 1119 } 1120 1121 return false; 1122 } 1123 1124 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1125 assert(bldarray != NULL, "illegal argument"); 1126 1127 if (arg == NULL) { 1128 return; 1129 } 1130 1131 int new_count = *count + 1; 1132 1133 // expand the array and add arg to the last element 1134 if (*bldarray == NULL) { 1135 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 1136 } else { 1137 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 1138 } 1139 (*bldarray)[*count] = os::strdup_check_oom(arg); 1140 *count = new_count; 1141 } 1142 1143 void Arguments::build_jvm_args(const char* arg) { 1144 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1145 } 1146 1147 void Arguments::build_jvm_flags(const char* arg) { 1148 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1149 } 1150 1151 // utility function to return a string that concatenates all 1152 // strings in a given char** array 1153 const char* Arguments::build_resource_string(char** args, int count) { 1154 if (args == NULL || count == 0) { 1155 return NULL; 1156 } 1157 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 1158 for (int i = 1; i < count; i++) { 1159 length += strlen(args[i]) + 1; // add 1 for a space 1160 } 1161 char* s = NEW_RESOURCE_ARRAY(char, length); 1162 strcpy(s, args[0]); 1163 for (int j = 1; j < count; j++) { 1164 strcat(s, " "); 1165 strcat(s, args[j]); 1166 } 1167 return (const char*) s; 1168 } 1169 1170 void Arguments::print_on(outputStream* st) { 1171 st->print_cr("VM Arguments:"); 1172 if (num_jvm_flags() > 0) { 1173 st->print("jvm_flags: "); print_jvm_flags_on(st); 1174 st->cr(); 1175 } 1176 if (num_jvm_args() > 0) { 1177 st->print("jvm_args: "); print_jvm_args_on(st); 1178 st->cr(); 1179 } 1180 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1181 if (_java_class_path != NULL) { 1182 char* path = _java_class_path->value(); 1183 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1184 } 1185 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1186 } 1187 1188 void Arguments::print_summary_on(outputStream* st) { 1189 // Print the command line. Environment variables that are helpful for 1190 // reproducing the problem are written later in the hs_err file. 1191 // flags are from setting file 1192 if (num_jvm_flags() > 0) { 1193 st->print_raw("Settings File: "); 1194 print_jvm_flags_on(st); 1195 st->cr(); 1196 } 1197 // args are the command line and environment variable arguments. 1198 st->print_raw("Command Line: "); 1199 if (num_jvm_args() > 0) { 1200 print_jvm_args_on(st); 1201 } 1202 // this is the classfile and any arguments to the java program 1203 if (java_command() != NULL) { 1204 st->print("%s", java_command()); 1205 } 1206 st->cr(); 1207 } 1208 1209 void Arguments::print_jvm_flags_on(outputStream* st) { 1210 if (_num_jvm_flags > 0) { 1211 for (int i=0; i < _num_jvm_flags; i++) { 1212 st->print("%s ", _jvm_flags_array[i]); 1213 } 1214 } 1215 } 1216 1217 void Arguments::print_jvm_args_on(outputStream* st) { 1218 if (_num_jvm_args > 0) { 1219 for (int i=0; i < _num_jvm_args; i++) { 1220 st->print("%s ", _jvm_args_array[i]); 1221 } 1222 } 1223 } 1224 1225 bool Arguments::process_argument(const char* arg, 1226 jboolean ignore_unrecognized, 1227 Flag::Flags origin) { 1228 JDK_Version since = JDK_Version(); 1229 1230 if (parse_argument(arg, origin)) { 1231 return true; 1232 } 1233 1234 // Determine if the flag has '+', '-', or '=' characters. 1235 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1236 const char* const argname = has_plus_minus ? arg + 1 : arg; 1237 1238 size_t arg_len; 1239 const char* equal_sign = strchr(argname, '='); 1240 if (equal_sign == NULL) { 1241 arg_len = strlen(argname); 1242 } else { 1243 arg_len = equal_sign - argname; 1244 } 1245 1246 // Only make the obsolete check for valid arguments. 1247 if (arg_len <= BUFLEN) { 1248 // Construct a string which consists only of the argument name without '+', '-', or '='. 1249 char stripped_argname[BUFLEN+1]; 1250 strncpy(stripped_argname, argname, arg_len); 1251 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate. 1252 if (is_obsolete_flag(stripped_argname, &since)) { 1253 char version[256]; 1254 since.to_string(version, sizeof(version)); 1255 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1256 return true; 1257 } 1258 #ifndef PRODUCT 1259 else { 1260 const char* replacement; 1261 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1262 log_warning(arguments)("%s has been removed. Please use %s instead.", 1263 stripped_argname, 1264 replacement); 1265 return false; 1266 } 1267 } 1268 #endif //PRODUCT 1269 } 1270 1271 // For locked flags, report a custom error message if available. 1272 // Otherwise, report the standard unrecognized VM option. 1273 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1274 if (found_flag != NULL) { 1275 char locked_message_buf[BUFLEN]; 1276 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1277 if (strlen(locked_message_buf) == 0) { 1278 if (found_flag->is_bool() && !has_plus_minus) { 1279 jio_fprintf(defaultStream::error_stream(), 1280 "Missing +/- setting for VM option '%s'\n", argname); 1281 } else if (!found_flag->is_bool() && has_plus_minus) { 1282 jio_fprintf(defaultStream::error_stream(), 1283 "Unexpected +/- setting in VM option '%s'\n", argname); 1284 } else { 1285 jio_fprintf(defaultStream::error_stream(), 1286 "Improperly specified VM option '%s'\n", argname); 1287 } 1288 } else { 1289 #ifdef PRODUCT 1290 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1291 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1292 if (ignore_unrecognized && mismatched) { 1293 return true; 1294 } 1295 #endif 1296 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1297 } 1298 } else { 1299 if (ignore_unrecognized) { 1300 return true; 1301 } 1302 jio_fprintf(defaultStream::error_stream(), 1303 "Unrecognized VM option '%s'\n", argname); 1304 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1305 if (fuzzy_matched != NULL) { 1306 jio_fprintf(defaultStream::error_stream(), 1307 "Did you mean '%s%s%s'? ", 1308 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1309 fuzzy_matched->_name, 1310 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1311 } 1312 } 1313 1314 // allow for commandline "commenting out" options like -XX:#+Verbose 1315 return arg[0] == '#'; 1316 } 1317 1318 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1319 FILE* stream = fopen(file_name, "rb"); 1320 if (stream == NULL) { 1321 if (should_exist) { 1322 jio_fprintf(defaultStream::error_stream(), 1323 "Could not open settings file %s\n", file_name); 1324 return false; 1325 } else { 1326 return true; 1327 } 1328 } 1329 1330 char token[1024]; 1331 int pos = 0; 1332 1333 bool in_white_space = true; 1334 bool in_comment = false; 1335 bool in_quote = false; 1336 char quote_c = 0; 1337 bool result = true; 1338 1339 int c = getc(stream); 1340 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1341 if (in_white_space) { 1342 if (in_comment) { 1343 if (c == '\n') in_comment = false; 1344 } else { 1345 if (c == '#') in_comment = true; 1346 else if (!isspace(c)) { 1347 in_white_space = false; 1348 token[pos++] = c; 1349 } 1350 } 1351 } else { 1352 if (c == '\n' || (!in_quote && isspace(c))) { 1353 // token ends at newline, or at unquoted whitespace 1354 // this allows a way to include spaces in string-valued options 1355 token[pos] = '\0'; 1356 logOption(token); 1357 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1358 build_jvm_flags(token); 1359 pos = 0; 1360 in_white_space = true; 1361 in_quote = false; 1362 } else if (!in_quote && (c == '\'' || c == '"')) { 1363 in_quote = true; 1364 quote_c = c; 1365 } else if (in_quote && (c == quote_c)) { 1366 in_quote = false; 1367 } else { 1368 token[pos++] = c; 1369 } 1370 } 1371 c = getc(stream); 1372 } 1373 if (pos > 0) { 1374 token[pos] = '\0'; 1375 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1376 build_jvm_flags(token); 1377 } 1378 fclose(stream); 1379 return result; 1380 } 1381 1382 //============================================================================================================= 1383 // Parsing of properties (-D) 1384 1385 const char* Arguments::get_property(const char* key) { 1386 return PropertyList_get_value(system_properties(), key); 1387 } 1388 1389 bool Arguments::add_property(const char* prop) { 1390 const char* eq = strchr(prop, '='); 1391 const char* key; 1392 const char* value = ""; 1393 1394 if (eq == NULL) { 1395 // property doesn't have a value, thus use passed string 1396 key = prop; 1397 } else { 1398 // property have a value, thus extract it and save to the 1399 // allocated string 1400 size_t key_len = eq - prop; 1401 char* tmp_key = AllocateHeap(key_len + 1, mtInternal); 1402 1403 strncpy(tmp_key, prop, key_len); 1404 tmp_key[key_len] = '\0'; 1405 key = tmp_key; 1406 1407 value = &prop[key_len + 1]; 1408 } 1409 1410 if (strcmp(key, "java.compiler") == 0) { 1411 process_java_compiler_argument(value); 1412 // Record value in Arguments, but let it get passed to Java. 1413 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1414 strcmp(key, "sun.java.launcher.pid") == 0) { 1415 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1416 // private and are processed in process_sun_java_launcher_properties(); 1417 // the sun.java.launcher property is passed on to the java application 1418 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1419 PropertyList_unique_add(&_system_properties, key, value, true); 1420 } else { 1421 if (strcmp(key, "sun.java.command") == 0) { 1422 char *old_java_command = _java_command; 1423 _java_command = os::strdup_check_oom(value, mtInternal); 1424 if (old_java_command != NULL) { 1425 os::free(old_java_command); 1426 } 1427 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1428 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1429 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1430 // its value without going through the property list or making a Java call. 1431 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal); 1432 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1433 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1434 os::free((void *)old_java_vendor_url_bug); 1435 } 1436 } 1437 1438 // Create new property and add at the end of the list 1439 PropertyList_unique_add(&_system_properties, key, value); 1440 } 1441 1442 if (key != prop) { 1443 // SystemProperty copy passed value, thus free previously allocated 1444 // memory 1445 FreeHeap((void *)key); 1446 } 1447 1448 return true; 1449 } 1450 1451 // sets or adds a module name to the jdk.launcher.addmods property 1452 bool Arguments::append_to_addmods_property(const char* module_name) { 1453 const char* key = "jdk.launcher.addmods"; 1454 const char* old_value = Arguments::get_property(key); 1455 size_t buf_len = strlen(key) + strlen(module_name) + 2; 1456 if (old_value != NULL) { 1457 buf_len += strlen(old_value) + 1; 1458 } 1459 char* new_value = AllocateHeap(buf_len, mtInternal); 1460 if (new_value == NULL) { 1461 return false; 1462 } 1463 if (old_value == NULL) { 1464 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name); 1465 } else { 1466 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name); 1467 } 1468 bool added = add_property(new_value); 1469 FreeHeap(new_value); 1470 return added; 1471 } 1472 1473 #if INCLUDE_CDS 1474 void Arguments::check_unsupported_dumping_properties() { 1475 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1476 const char* unsupported_properties[5] = { "jdk.module.main", 1477 "jdk.module.path", 1478 "jdk.upgrade.module.path", 1479 "jdk.launcher.addmods", 1480 "jdk.launcher.limitmods" }; 1481 const char* unsupported_options[5] = { "-m", 1482 "-modulepath", 1483 "-upgrademodulepath", 1484 "-addmods", 1485 "-limitmods" }; 1486 SystemProperty* sp = system_properties(); 1487 while (sp != NULL) { 1488 for (int i = 0; i < 5; i++) { 1489 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1490 vm_exit_during_initialization( 1491 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1492 } 1493 } 1494 sp = sp->next(); 1495 } 1496 } 1497 #endif 1498 1499 //=========================================================================================================== 1500 // Setting int/mixed/comp mode flags 1501 1502 void Arguments::set_mode_flags(Mode mode) { 1503 // Set up default values for all flags. 1504 // If you add a flag to any of the branches below, 1505 // add a default value for it here. 1506 set_java_compiler(false); 1507 _mode = mode; 1508 1509 // Ensure Agent_OnLoad has the correct initial values. 1510 // This may not be the final mode; mode may change later in onload phase. 1511 PropertyList_unique_add(&_system_properties, "java.vm.info", 1512 VM_Version::vm_info_string(), false); 1513 1514 UseInterpreter = true; 1515 UseCompiler = true; 1516 UseLoopCounter = true; 1517 1518 // Default values may be platform/compiler dependent - 1519 // use the saved values 1520 ClipInlining = Arguments::_ClipInlining; 1521 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1522 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1523 BackgroundCompilation = Arguments::_BackgroundCompilation; 1524 if (TieredCompilation) { 1525 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1526 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1527 } 1528 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1529 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1530 } 1531 } 1532 1533 // Change from defaults based on mode 1534 switch (mode) { 1535 default: 1536 ShouldNotReachHere(); 1537 break; 1538 case _int: 1539 UseCompiler = false; 1540 UseLoopCounter = false; 1541 AlwaysCompileLoopMethods = false; 1542 UseOnStackReplacement = false; 1543 break; 1544 case _mixed: 1545 // same as default 1546 break; 1547 case _comp: 1548 UseInterpreter = false; 1549 BackgroundCompilation = false; 1550 ClipInlining = false; 1551 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1552 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1553 // compile a level 4 (C2) and then continue executing it. 1554 if (TieredCompilation) { 1555 Tier3InvokeNotifyFreqLog = 0; 1556 Tier4InvocationThreshold = 0; 1557 } 1558 break; 1559 } 1560 } 1561 1562 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS 1563 // Conflict: required to use shared spaces (-Xshare:on), but 1564 // incompatible command line options were chosen. 1565 1566 static void no_shared_spaces(const char* message) { 1567 if (RequireSharedSpaces) { 1568 jio_fprintf(defaultStream::error_stream(), 1569 "Class data sharing is inconsistent with other specified options.\n"); 1570 vm_exit_during_initialization("Unable to use shared archive.", message); 1571 } else { 1572 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1573 } 1574 } 1575 #endif 1576 1577 // Returns threshold scaled with the value of scale. 1578 // If scale < 0.0, threshold is returned without scaling. 1579 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1580 if (scale == 1.0 || scale < 0.0) { 1581 return threshold; 1582 } else { 1583 return (intx)(threshold * scale); 1584 } 1585 } 1586 1587 // Returns freq_log scaled with the value of scale. 1588 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1589 // If scale < 0.0, freq_log is returned without scaling. 1590 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1591 // Check if scaling is necessary or if negative value was specified. 1592 if (scale == 1.0 || scale < 0.0) { 1593 return freq_log; 1594 } 1595 // Check values to avoid calculating log2 of 0. 1596 if (scale == 0.0 || freq_log == 0) { 1597 return 0; 1598 } 1599 // Determine the maximum notification frequency value currently supported. 1600 // The largest mask value that the interpreter/C1 can handle is 1601 // of length InvocationCounter::number_of_count_bits. Mask values are always 1602 // one bit shorter then the value of the notification frequency. Set 1603 // max_freq_bits accordingly. 1604 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1605 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1606 if (scaled_freq == 0) { 1607 // Return 0 right away to avoid calculating log2 of 0. 1608 return 0; 1609 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1610 return max_freq_bits; 1611 } else { 1612 return log2_intptr(scaled_freq); 1613 } 1614 } 1615 1616 void Arguments::set_tiered_flags() { 1617 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1618 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1619 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1620 } 1621 if (CompilationPolicyChoice < 2) { 1622 vm_exit_during_initialization( 1623 "Incompatible compilation policy selected", NULL); 1624 } 1625 // Increase the code cache size - tiered compiles a lot more. 1626 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1627 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1628 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1629 } 1630 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1631 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1632 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1633 } 1634 if (!UseInterpreter) { // -Xcomp 1635 Tier3InvokeNotifyFreqLog = 0; 1636 Tier4InvocationThreshold = 0; 1637 } 1638 1639 if (CompileThresholdScaling < 0) { 1640 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1641 } 1642 1643 // Scale tiered compilation thresholds. 1644 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1645 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1646 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1647 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1648 1649 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1650 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1651 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1652 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1653 1654 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1655 // once these thresholds become supported. 1656 1657 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1658 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1659 1660 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1661 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1662 1663 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1664 1665 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1666 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1667 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1668 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1669 } 1670 } 1671 1672 #if INCLUDE_ALL_GCS 1673 static void disable_adaptive_size_policy(const char* collector_name) { 1674 if (UseAdaptiveSizePolicy) { 1675 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1676 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1677 collector_name); 1678 } 1679 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1680 } 1681 } 1682 1683 void Arguments::set_parnew_gc_flags() { 1684 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1685 "control point invariant"); 1686 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1687 assert(UseParNewGC, "ParNew should always be used with CMS"); 1688 1689 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1690 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1691 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1692 } else if (ParallelGCThreads == 0) { 1693 jio_fprintf(defaultStream::error_stream(), 1694 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1695 vm_exit(1); 1696 } 1697 1698 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1699 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1700 // we set them to 1024 and 1024. 1701 // See CR 6362902. 1702 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1703 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1704 } 1705 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1706 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1707 } 1708 1709 // When using compressed oops, we use local overflow stacks, 1710 // rather than using a global overflow list chained through 1711 // the klass word of the object's pre-image. 1712 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1713 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1714 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1715 } 1716 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1717 } 1718 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1719 } 1720 1721 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1722 // sparc/solaris for certain applications, but would gain from 1723 // further optimization and tuning efforts, and would almost 1724 // certainly gain from analysis of platform and environment. 1725 void Arguments::set_cms_and_parnew_gc_flags() { 1726 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1727 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1728 assert(UseParNewGC, "ParNew should always be used with CMS"); 1729 1730 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1731 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1732 1733 set_parnew_gc_flags(); 1734 1735 size_t max_heap = align_size_down(MaxHeapSize, 1736 CardTableRS::ct_max_alignment_constraint()); 1737 1738 // Now make adjustments for CMS 1739 intx tenuring_default = (intx)6; 1740 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1741 1742 // Preferred young gen size for "short" pauses: 1743 // upper bound depends on # of threads and NewRatio. 1744 const size_t preferred_max_new_size_unaligned = 1745 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1746 size_t preferred_max_new_size = 1747 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1748 1749 // Unless explicitly requested otherwise, size young gen 1750 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1751 1752 // If either MaxNewSize or NewRatio is set on the command line, 1753 // assume the user is trying to set the size of the young gen. 1754 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1755 1756 // Set MaxNewSize to our calculated preferred_max_new_size unless 1757 // NewSize was set on the command line and it is larger than 1758 // preferred_max_new_size. 1759 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1760 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1761 } else { 1762 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1763 } 1764 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1765 1766 // Code along this path potentially sets NewSize and OldSize 1767 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1768 min_heap_size(), InitialHeapSize, max_heap); 1769 size_t min_new = preferred_max_new_size; 1770 if (FLAG_IS_CMDLINE(NewSize)) { 1771 min_new = NewSize; 1772 } 1773 if (max_heap > min_new && min_heap_size() > min_new) { 1774 // Unless explicitly requested otherwise, make young gen 1775 // at least min_new, and at most preferred_max_new_size. 1776 if (FLAG_IS_DEFAULT(NewSize)) { 1777 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1778 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1779 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1780 } 1781 // Unless explicitly requested otherwise, size old gen 1782 // so it's NewRatio x of NewSize. 1783 if (FLAG_IS_DEFAULT(OldSize)) { 1784 if (max_heap > NewSize) { 1785 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1786 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1787 } 1788 } 1789 } 1790 } 1791 // Unless explicitly requested otherwise, definitely 1792 // promote all objects surviving "tenuring_default" scavenges. 1793 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1794 FLAG_IS_DEFAULT(SurvivorRatio)) { 1795 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1796 } 1797 // If we decided above (or user explicitly requested) 1798 // `promote all' (via MaxTenuringThreshold := 0), 1799 // prefer minuscule survivor spaces so as not to waste 1800 // space for (non-existent) survivors 1801 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1802 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1803 } 1804 1805 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1806 // but rather the number of free blocks of a given size that are used when 1807 // replenishing the local per-worker free list caches. 1808 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1809 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1810 // OldPLAB sizing manually turned off: Use a larger default setting, 1811 // unless it was manually specified. This is because a too-low value 1812 // will slow down scavenges. 1813 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1814 } else { 1815 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1816 } 1817 } 1818 1819 // If either of the static initialization defaults have changed, note this 1820 // modification. 1821 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1822 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1823 } 1824 1825 if (!ClassUnloading) { 1826 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1827 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1828 } 1829 1830 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1831 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads); 1832 } 1833 #endif // INCLUDE_ALL_GCS 1834 1835 void set_object_alignment() { 1836 // Object alignment. 1837 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1838 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1839 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1840 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1841 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1842 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1843 1844 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1845 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1846 1847 // Oop encoding heap max 1848 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1849 1850 if (SurvivorAlignmentInBytes == 0) { 1851 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1852 } 1853 1854 #if INCLUDE_ALL_GCS 1855 // Set CMS global values 1856 CompactibleFreeListSpace::set_cms_values(); 1857 #endif // INCLUDE_ALL_GCS 1858 } 1859 1860 size_t Arguments::max_heap_for_compressed_oops() { 1861 // Avoid sign flip. 1862 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1863 // We need to fit both the NULL page and the heap into the memory budget, while 1864 // keeping alignment constraints of the heap. To guarantee the latter, as the 1865 // NULL page is located before the heap, we pad the NULL page to the conservative 1866 // maximum alignment that the GC may ever impose upon the heap. 1867 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1868 _conservative_max_heap_alignment); 1869 1870 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1871 NOT_LP64(ShouldNotReachHere(); return 0); 1872 } 1873 1874 bool Arguments::should_auto_select_low_pause_collector() { 1875 if (UseAutoGCSelectPolicy && 1876 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1877 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1878 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1879 return true; 1880 } 1881 return false; 1882 } 1883 1884 void Arguments::set_use_compressed_oops() { 1885 #ifndef ZERO 1886 #ifdef _LP64 1887 // MaxHeapSize is not set up properly at this point, but 1888 // the only value that can override MaxHeapSize if we are 1889 // to use UseCompressedOops is InitialHeapSize. 1890 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1891 1892 if (max_heap_size <= max_heap_for_compressed_oops()) { 1893 #if !defined(COMPILER1) || defined(TIERED) 1894 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1895 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1896 } 1897 #endif 1898 } else { 1899 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1900 warning("Max heap size too large for Compressed Oops"); 1901 FLAG_SET_DEFAULT(UseCompressedOops, false); 1902 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1903 } 1904 } 1905 #endif // _LP64 1906 #endif // ZERO 1907 } 1908 1909 1910 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1911 // set_use_compressed_oops(). 1912 void Arguments::set_use_compressed_klass_ptrs() { 1913 #ifndef ZERO 1914 #ifdef _LP64 1915 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1916 if (!UseCompressedOops) { 1917 if (UseCompressedClassPointers) { 1918 warning("UseCompressedClassPointers requires UseCompressedOops"); 1919 } 1920 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1921 } else { 1922 // Turn on UseCompressedClassPointers too 1923 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1924 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1925 } 1926 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1927 if (UseCompressedClassPointers) { 1928 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1929 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1930 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1931 } 1932 } 1933 } 1934 #endif // _LP64 1935 #endif // !ZERO 1936 } 1937 1938 void Arguments::set_conservative_max_heap_alignment() { 1939 // The conservative maximum required alignment for the heap is the maximum of 1940 // the alignments imposed by several sources: any requirements from the heap 1941 // itself, the collector policy and the maximum page size we may run the VM 1942 // with. 1943 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1944 #if INCLUDE_ALL_GCS 1945 if (UseParallelGC) { 1946 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1947 } else if (UseG1GC) { 1948 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1949 } 1950 #endif // INCLUDE_ALL_GCS 1951 _conservative_max_heap_alignment = MAX4(heap_alignment, 1952 (size_t)os::vm_allocation_granularity(), 1953 os::max_page_size(), 1954 CollectorPolicy::compute_heap_alignment()); 1955 } 1956 1957 bool Arguments::gc_selected() { 1958 #if INCLUDE_ALL_GCS 1959 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1960 #else 1961 return UseSerialGC; 1962 #endif // INCLUDE_ALL_GCS 1963 } 1964 1965 void Arguments::select_gc_ergonomically() { 1966 #if INCLUDE_ALL_GCS 1967 if (os::is_server_class_machine()) { 1968 if (should_auto_select_low_pause_collector()) { 1969 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true); 1970 } else { 1971 #if defined(JAVASE_EMBEDDED) 1972 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true); 1973 #else 1974 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1975 #endif 1976 } 1977 } else { 1978 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1979 } 1980 #else 1981 UNSUPPORTED_OPTION(UseG1GC); 1982 UNSUPPORTED_OPTION(UseParallelGC); 1983 UNSUPPORTED_OPTION(UseParallelOldGC); 1984 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1985 UNSUPPORTED_OPTION(UseParNewGC); 1986 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1987 #endif // INCLUDE_ALL_GCS 1988 } 1989 1990 void Arguments::select_gc() { 1991 if (!gc_selected()) { 1992 select_gc_ergonomically(); 1993 if (!gc_selected()) { 1994 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1995 } 1996 } 1997 } 1998 1999 void Arguments::set_ergonomics_flags() { 2000 select_gc(); 2001 2002 #if defined(COMPILER2) || INCLUDE_JVMCI 2003 // Shared spaces work fine with other GCs but causes bytecode rewriting 2004 // to be disabled, which hurts interpreter performance and decreases 2005 // server performance. When -server is specified, keep the default off 2006 // unless it is asked for. Future work: either add bytecode rewriting 2007 // at link time, or rewrite bytecodes in non-shared methods. 2008 if (!DumpSharedSpaces && !RequireSharedSpaces && 2009 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 2010 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 2011 } 2012 #endif 2013 2014 set_conservative_max_heap_alignment(); 2015 2016 #ifndef ZERO 2017 #ifdef _LP64 2018 set_use_compressed_oops(); 2019 2020 // set_use_compressed_klass_ptrs() must be called after calling 2021 // set_use_compressed_oops(). 2022 set_use_compressed_klass_ptrs(); 2023 2024 // Also checks that certain machines are slower with compressed oops 2025 // in vm_version initialization code. 2026 #endif // _LP64 2027 #endif // !ZERO 2028 2029 CodeCacheExtensions::set_ergonomics_flags(); 2030 } 2031 2032 void Arguments::set_parallel_gc_flags() { 2033 assert(UseParallelGC || UseParallelOldGC, "Error"); 2034 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 2035 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 2036 FLAG_SET_DEFAULT(UseParallelOldGC, true); 2037 } 2038 FLAG_SET_DEFAULT(UseParallelGC, true); 2039 2040 // If no heap maximum was requested explicitly, use some reasonable fraction 2041 // of the physical memory, up to a maximum of 1GB. 2042 FLAG_SET_DEFAULT(ParallelGCThreads, 2043 Abstract_VM_Version::parallel_worker_threads()); 2044 if (ParallelGCThreads == 0) { 2045 jio_fprintf(defaultStream::error_stream(), 2046 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 2047 vm_exit(1); 2048 } 2049 2050 if (UseAdaptiveSizePolicy) { 2051 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 2052 // unless the user actually sets these flags. 2053 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 2054 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 2055 } 2056 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 2057 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 2058 } 2059 } 2060 2061 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 2062 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 2063 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 2064 // See CR 6362902 for details. 2065 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 2066 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 2067 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 2068 } 2069 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 2070 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 2071 } 2072 } 2073 2074 if (UseParallelOldGC) { 2075 // Par compact uses lower default values since they are treated as 2076 // minimums. These are different defaults because of the different 2077 // interpretation and are not ergonomically set. 2078 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 2079 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 2080 } 2081 } 2082 } 2083 2084 void Arguments::set_g1_gc_flags() { 2085 assert(UseG1GC, "Error"); 2086 #if defined(COMPILER1) || INCLUDE_JVMCI 2087 FastTLABRefill = false; 2088 #endif 2089 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 2090 if (ParallelGCThreads == 0) { 2091 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 2092 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 2093 } 2094 2095 #if INCLUDE_ALL_GCS 2096 if (G1ConcRefinementThreads == 0) { 2097 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 2098 } 2099 #endif 2100 2101 // MarkStackSize will be set (if it hasn't been set by the user) 2102 // when concurrent marking is initialized. 2103 // Its value will be based upon the number of parallel marking threads. 2104 // But we do set the maximum mark stack size here. 2105 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 2106 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 2107 } 2108 2109 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 2110 // In G1, we want the default GC overhead goal to be higher than 2111 // it is for PS, or the heap might be expanded too aggressively. 2112 // We set it here to ~8%. 2113 FLAG_SET_DEFAULT(GCTimeRatio, 12); 2114 } 2115 2116 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 2117 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads); 2118 } 2119 2120 void Arguments::set_gc_specific_flags() { 2121 #if INCLUDE_ALL_GCS 2122 // Set per-collector flags 2123 if (UseParallelGC || UseParallelOldGC) { 2124 set_parallel_gc_flags(); 2125 } else if (UseConcMarkSweepGC) { 2126 set_cms_and_parnew_gc_flags(); 2127 } else if (UseG1GC) { 2128 set_g1_gc_flags(); 2129 } 2130 if (AssumeMP && !UseSerialGC) { 2131 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2132 warning("If the number of processors is expected to increase from one, then" 2133 " you should configure the number of parallel GC threads appropriately" 2134 " using -XX:ParallelGCThreads=N"); 2135 } 2136 } 2137 if (MinHeapFreeRatio == 100) { 2138 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2139 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2140 } 2141 #endif // INCLUDE_ALL_GCS 2142 } 2143 2144 julong Arguments::limit_by_allocatable_memory(julong limit) { 2145 julong max_allocatable; 2146 julong result = limit; 2147 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2148 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2149 } 2150 return result; 2151 } 2152 2153 // Use static initialization to get the default before parsing 2154 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2155 2156 void Arguments::set_heap_size() { 2157 const julong phys_mem = 2158 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2159 : (julong)MaxRAM; 2160 2161 // If the maximum heap size has not been set with -Xmx, 2162 // then set it as fraction of the size of physical memory, 2163 // respecting the maximum and minimum sizes of the heap. 2164 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2165 julong reasonable_max = phys_mem / MaxRAMFraction; 2166 2167 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2168 // Small physical memory, so use a minimum fraction of it for the heap 2169 reasonable_max = phys_mem / MinRAMFraction; 2170 } else { 2171 // Not-small physical memory, so require a heap at least 2172 // as large as MaxHeapSize 2173 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2174 } 2175 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2176 // Limit the heap size to ErgoHeapSizeLimit 2177 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2178 } 2179 if (UseCompressedOops) { 2180 // Limit the heap size to the maximum possible when using compressed oops 2181 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2182 2183 // HeapBaseMinAddress can be greater than default but not less than. 2184 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2185 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2186 // matches compressed oops printing flags 2187 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 2188 jio_fprintf(defaultStream::error_stream(), 2189 "HeapBaseMinAddress must be at least " SIZE_FORMAT 2190 " (" SIZE_FORMAT "G) which is greater than value given " 2191 SIZE_FORMAT "\n", 2192 DefaultHeapBaseMinAddress, 2193 DefaultHeapBaseMinAddress/G, 2194 HeapBaseMinAddress); 2195 } 2196 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2197 } 2198 } 2199 2200 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2201 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2202 // but it should be not less than default MaxHeapSize. 2203 max_coop_heap -= HeapBaseMinAddress; 2204 } 2205 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2206 } 2207 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2208 2209 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2210 // An initial heap size was specified on the command line, 2211 // so be sure that the maximum size is consistent. Done 2212 // after call to limit_by_allocatable_memory because that 2213 // method might reduce the allocation size. 2214 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2215 } 2216 2217 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2218 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2219 } 2220 2221 // If the minimum or initial heap_size have not been set or requested to be set 2222 // ergonomically, set them accordingly. 2223 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2224 julong reasonable_minimum = (julong)(OldSize + NewSize); 2225 2226 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2227 2228 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2229 2230 if (InitialHeapSize == 0) { 2231 julong reasonable_initial = phys_mem / InitialRAMFraction; 2232 2233 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2234 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2235 2236 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2237 2238 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2239 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2240 } 2241 // If the minimum heap size has not been set (via -Xms), 2242 // synchronize with InitialHeapSize to avoid errors with the default value. 2243 if (min_heap_size() == 0) { 2244 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2245 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2246 } 2247 } 2248 } 2249 2250 // This option inspects the machine and attempts to set various 2251 // parameters to be optimal for long-running, memory allocation 2252 // intensive jobs. It is intended for machines with large 2253 // amounts of cpu and memory. 2254 jint Arguments::set_aggressive_heap_flags() { 2255 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2256 // VM, but we may not be able to represent the total physical memory 2257 // available (like having 8gb of memory on a box but using a 32bit VM). 2258 // Thus, we need to make sure we're using a julong for intermediate 2259 // calculations. 2260 julong initHeapSize; 2261 julong total_memory = os::physical_memory(); 2262 2263 if (total_memory < (julong) 256 * M) { 2264 jio_fprintf(defaultStream::error_stream(), 2265 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2266 vm_exit(1); 2267 } 2268 2269 // The heap size is half of available memory, or (at most) 2270 // all of possible memory less 160mb (leaving room for the OS 2271 // when using ISM). This is the maximum; because adaptive sizing 2272 // is turned on below, the actual space used may be smaller. 2273 2274 initHeapSize = MIN2(total_memory / (julong) 2, 2275 total_memory - (julong) 160 * M); 2276 2277 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2278 2279 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2280 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2281 return JNI_EINVAL; 2282 } 2283 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2284 return JNI_EINVAL; 2285 } 2286 // Currently the minimum size and the initial heap sizes are the same. 2287 set_min_heap_size(initHeapSize); 2288 } 2289 if (FLAG_IS_DEFAULT(NewSize)) { 2290 // Make the young generation 3/8ths of the total heap. 2291 if (FLAG_SET_CMDLINE(size_t, NewSize, 2292 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2293 return JNI_EINVAL; 2294 } 2295 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2296 return JNI_EINVAL; 2297 } 2298 } 2299 2300 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2301 FLAG_SET_DEFAULT(UseLargePages, true); 2302 #endif 2303 2304 // Increase some data structure sizes for efficiency 2305 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2306 return JNI_EINVAL; 2307 } 2308 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2309 return JNI_EINVAL; 2310 } 2311 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2312 return JNI_EINVAL; 2313 } 2314 2315 // See the OldPLABSize comment below, but replace 'after promotion' 2316 // with 'after copying'. YoungPLABSize is the size of the survivor 2317 // space per-gc-thread buffers. The default is 4kw. 2318 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2319 return JNI_EINVAL; 2320 } 2321 2322 // OldPLABSize is the size of the buffers in the old gen that 2323 // UseParallelGC uses to promote live data that doesn't fit in the 2324 // survivor spaces. At any given time, there's one for each gc thread. 2325 // The default size is 1kw. These buffers are rarely used, since the 2326 // survivor spaces are usually big enough. For specjbb, however, there 2327 // are occasions when there's lots of live data in the young gen 2328 // and we end up promoting some of it. We don't have a definite 2329 // explanation for why bumping OldPLABSize helps, but the theory 2330 // is that a bigger PLAB results in retaining something like the 2331 // original allocation order after promotion, which improves mutator 2332 // locality. A minor effect may be that larger PLABs reduce the 2333 // number of PLAB allocation events during gc. The value of 8kw 2334 // was arrived at by experimenting with specjbb. 2335 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2336 return JNI_EINVAL; 2337 } 2338 2339 // Enable parallel GC and adaptive generation sizing 2340 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2341 return JNI_EINVAL; 2342 } 2343 FLAG_SET_DEFAULT(ParallelGCThreads, 2344 Abstract_VM_Version::parallel_worker_threads()); 2345 2346 // Encourage steady state memory management 2347 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2348 return JNI_EINVAL; 2349 } 2350 2351 // This appears to improve mutator locality 2352 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2353 return JNI_EINVAL; 2354 } 2355 2356 // Get around early Solaris scheduling bug 2357 // (affinity vs other jobs on system) 2358 // but disallow DR and offlining (5008695). 2359 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2360 return JNI_EINVAL; 2361 } 2362 2363 return JNI_OK; 2364 } 2365 2366 // This must be called after ergonomics. 2367 void Arguments::set_bytecode_flags() { 2368 if (!RewriteBytecodes) { 2369 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2370 } 2371 } 2372 2373 // Aggressive optimization flags -XX:+AggressiveOpts 2374 jint Arguments::set_aggressive_opts_flags() { 2375 #ifdef COMPILER2 2376 if (AggressiveUnboxing) { 2377 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2378 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2379 } else if (!EliminateAutoBox) { 2380 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2381 AggressiveUnboxing = false; 2382 } 2383 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2384 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2385 } else if (!DoEscapeAnalysis) { 2386 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2387 AggressiveUnboxing = false; 2388 } 2389 } 2390 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2391 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2392 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2393 } 2394 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2395 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2396 } 2397 2398 // Feed the cache size setting into the JDK 2399 char buffer[1024]; 2400 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2401 if (!add_property(buffer)) { 2402 return JNI_ENOMEM; 2403 } 2404 } 2405 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2406 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2407 } 2408 #endif 2409 2410 if (AggressiveOpts) { 2411 // Sample flag setting code 2412 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2413 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2414 // } 2415 } 2416 2417 return JNI_OK; 2418 } 2419 2420 //=========================================================================================================== 2421 // Parsing of java.compiler property 2422 2423 void Arguments::process_java_compiler_argument(const char* arg) { 2424 // For backwards compatibility, Djava.compiler=NONE or "" 2425 // causes us to switch to -Xint mode UNLESS -Xdebug 2426 // is also specified. 2427 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2428 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2429 } 2430 } 2431 2432 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2433 _sun_java_launcher = os::strdup_check_oom(launcher); 2434 } 2435 2436 bool Arguments::created_by_java_launcher() { 2437 assert(_sun_java_launcher != NULL, "property must have value"); 2438 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2439 } 2440 2441 bool Arguments::sun_java_launcher_is_altjvm() { 2442 return _sun_java_launcher_is_altjvm; 2443 } 2444 2445 //=========================================================================================================== 2446 // Parsing of main arguments 2447 2448 #if INCLUDE_JVMCI 2449 // Check consistency of jvmci vm argument settings. 2450 bool Arguments::check_jvmci_args_consistency() { 2451 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) { 2452 JVMCIGlobals::print_jvmci_args_inconsistency_error_message(); 2453 return false; 2454 } 2455 return true; 2456 } 2457 #endif //INCLUDE_JVMCI 2458 2459 // Check consistency of GC selection 2460 bool Arguments::check_gc_consistency() { 2461 // Ensure that the user has not selected conflicting sets 2462 // of collectors. 2463 uint i = 0; 2464 if (UseSerialGC) i++; 2465 if (UseConcMarkSweepGC) i++; 2466 if (UseParallelGC || UseParallelOldGC) i++; 2467 if (UseG1GC) i++; 2468 if (i > 1) { 2469 jio_fprintf(defaultStream::error_stream(), 2470 "Conflicting collector combinations in option list; " 2471 "please refer to the release notes for the combinations " 2472 "allowed\n"); 2473 return false; 2474 } 2475 2476 if (UseConcMarkSweepGC && !UseParNewGC) { 2477 jio_fprintf(defaultStream::error_stream(), 2478 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2479 return false; 2480 } 2481 2482 if (UseParNewGC && !UseConcMarkSweepGC) { 2483 jio_fprintf(defaultStream::error_stream(), 2484 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2485 return false; 2486 } 2487 2488 return true; 2489 } 2490 2491 // Check the consistency of vm_init_args 2492 bool Arguments::check_vm_args_consistency() { 2493 // Method for adding checks for flag consistency. 2494 // The intent is to warn the user of all possible conflicts, 2495 // before returning an error. 2496 // Note: Needs platform-dependent factoring. 2497 bool status = true; 2498 2499 if (TLABRefillWasteFraction == 0) { 2500 jio_fprintf(defaultStream::error_stream(), 2501 "TLABRefillWasteFraction should be a denominator, " 2502 "not " SIZE_FORMAT "\n", 2503 TLABRefillWasteFraction); 2504 status = false; 2505 } 2506 2507 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2508 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2509 } 2510 2511 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2512 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2513 } 2514 2515 if (GCTimeLimit == 100) { 2516 // Turn off gc-overhead-limit-exceeded checks 2517 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2518 } 2519 2520 status = status && check_gc_consistency(); 2521 2522 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2523 // insists that we hold the requisite locks so that the iteration is 2524 // MT-safe. For the verification at start-up and shut-down, we don't 2525 // yet have a good way of acquiring and releasing these locks, 2526 // which are not visible at the CollectedHeap level. We want to 2527 // be able to acquire these locks and then do the iteration rather 2528 // than just disable the lock verification. This will be fixed under 2529 // bug 4788986. 2530 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2531 if (VerifyDuringStartup) { 2532 warning("Heap verification at start-up disabled " 2533 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2534 VerifyDuringStartup = false; // Disable verification at start-up 2535 } 2536 2537 if (VerifyBeforeExit) { 2538 warning("Heap verification at shutdown disabled " 2539 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2540 VerifyBeforeExit = false; // Disable verification at shutdown 2541 } 2542 } 2543 2544 if (PrintNMTStatistics) { 2545 #if INCLUDE_NMT 2546 if (MemTracker::tracking_level() == NMT_off) { 2547 #endif // INCLUDE_NMT 2548 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2549 PrintNMTStatistics = false; 2550 #if INCLUDE_NMT 2551 } 2552 #endif 2553 } 2554 #if INCLUDE_JVMCI 2555 2556 status = status && check_jvmci_args_consistency(); 2557 2558 if (EnableJVMCI) { 2559 if (!ScavengeRootsInCode) { 2560 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2561 ScavengeRootsInCode = 1; 2562 } 2563 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2564 TypeProfileLevel = 0; 2565 } 2566 if (UseJVMCICompiler) { 2567 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2568 TypeProfileWidth = 8; 2569 } 2570 } 2571 } 2572 #endif 2573 2574 // Check lower bounds of the code cache 2575 // Template Interpreter code is approximately 3X larger in debug builds. 2576 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2577 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2578 jio_fprintf(defaultStream::error_stream(), 2579 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2580 os::vm_page_size()/K); 2581 status = false; 2582 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2583 jio_fprintf(defaultStream::error_stream(), 2584 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2585 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2586 status = false; 2587 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2588 jio_fprintf(defaultStream::error_stream(), 2589 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2590 min_code_cache_size/K); 2591 status = false; 2592 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2593 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2594 jio_fprintf(defaultStream::error_stream(), 2595 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2596 CODE_CACHE_SIZE_LIMIT/M); 2597 status = false; 2598 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2599 jio_fprintf(defaultStream::error_stream(), 2600 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2601 min_code_cache_size/K); 2602 status = false; 2603 } 2604 2605 #ifdef _LP64 2606 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2607 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2608 } 2609 #endif 2610 2611 #ifndef SUPPORT_RESERVED_STACK_AREA 2612 if (StackReservedPages != 0) { 2613 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2614 warning("Reserved Stack Area not supported on this platform"); 2615 } 2616 #endif 2617 2618 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2619 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2620 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2621 } 2622 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2623 } 2624 return status; 2625 } 2626 2627 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2628 const char* option_type) { 2629 if (ignore) return false; 2630 2631 const char* spacer = " "; 2632 if (option_type == NULL) { 2633 option_type = ++spacer; // Set both to the empty string. 2634 } 2635 2636 if (os::obsolete_option(option)) { 2637 jio_fprintf(defaultStream::error_stream(), 2638 "Obsolete %s%soption: %s\n", option_type, spacer, 2639 option->optionString); 2640 return false; 2641 } else { 2642 jio_fprintf(defaultStream::error_stream(), 2643 "Unrecognized %s%soption: %s\n", option_type, spacer, 2644 option->optionString); 2645 return true; 2646 } 2647 } 2648 2649 static const char* user_assertion_options[] = { 2650 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2651 }; 2652 2653 static const char* system_assertion_options[] = { 2654 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2655 }; 2656 2657 bool Arguments::parse_uintx(const char* value, 2658 uintx* uintx_arg, 2659 uintx min_size) { 2660 2661 // Check the sign first since atomull() parses only unsigned values. 2662 bool value_is_positive = !(*value == '-'); 2663 2664 if (value_is_positive) { 2665 julong n; 2666 bool good_return = atomull(value, &n); 2667 if (good_return) { 2668 bool above_minimum = n >= min_size; 2669 bool value_is_too_large = n > max_uintx; 2670 2671 if (above_minimum && !value_is_too_large) { 2672 *uintx_arg = n; 2673 return true; 2674 } 2675 } 2676 } 2677 return false; 2678 } 2679 2680 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2681 julong* long_arg, 2682 julong min_size) { 2683 if (!atomull(s, long_arg)) return arg_unreadable; 2684 return check_memory_size(*long_arg, min_size); 2685 } 2686 2687 // Parse JavaVMInitArgs structure 2688 2689 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2690 const JavaVMInitArgs *java_options_args, 2691 const JavaVMInitArgs *cmd_line_args) { 2692 // For components of the system classpath. 2693 ArgumentBootClassPath bcp(Arguments::get_sysclasspath()); 2694 bool bcp_assembly_required = false; 2695 2696 // Save default settings for some mode flags 2697 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2698 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2699 Arguments::_ClipInlining = ClipInlining; 2700 Arguments::_BackgroundCompilation = BackgroundCompilation; 2701 if (TieredCompilation) { 2702 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2703 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2704 } 2705 2706 // Setup flags for mixed which is the default 2707 set_mode_flags(_mixed); 2708 2709 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2710 // variable (if present). 2711 jint result = parse_each_vm_init_arg( 2712 java_tool_options_args, &bcp, &bcp_assembly_required, Flag::ENVIRON_VAR); 2713 if (result != JNI_OK) { 2714 return result; 2715 } 2716 2717 // Parse args structure generated from the command line flags. 2718 result = parse_each_vm_init_arg(cmd_line_args, &bcp, &bcp_assembly_required, 2719 Flag::COMMAND_LINE); 2720 if (result != JNI_OK) { 2721 return result; 2722 } 2723 2724 // Parse args structure generated from the _JAVA_OPTIONS environment 2725 // variable (if present) (mimics classic VM) 2726 result = parse_each_vm_init_arg( 2727 java_options_args, &bcp, &bcp_assembly_required, Flag::ENVIRON_VAR); 2728 if (result != JNI_OK) { 2729 return result; 2730 } 2731 2732 // Do final processing now that all arguments have been parsed 2733 result = finalize_vm_init_args(&bcp, bcp_assembly_required); 2734 if (result != JNI_OK) { 2735 return result; 2736 } 2737 2738 return JNI_OK; 2739 } 2740 2741 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2742 // represents a valid JDWP agent. is_path==true denotes that we 2743 // are dealing with -agentpath (case where name is a path), otherwise with 2744 // -agentlib 2745 bool valid_jdwp_agent(char *name, bool is_path) { 2746 char *_name; 2747 const char *_jdwp = "jdwp"; 2748 size_t _len_jdwp, _len_prefix; 2749 2750 if (is_path) { 2751 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2752 return false; 2753 } 2754 2755 _name++; // skip past last path separator 2756 _len_prefix = strlen(JNI_LIB_PREFIX); 2757 2758 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2759 return false; 2760 } 2761 2762 _name += _len_prefix; 2763 _len_jdwp = strlen(_jdwp); 2764 2765 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2766 _name += _len_jdwp; 2767 } 2768 else { 2769 return false; 2770 } 2771 2772 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2773 return false; 2774 } 2775 2776 return true; 2777 } 2778 2779 if (strcmp(name, _jdwp) == 0) { 2780 return true; 2781 } 2782 2783 return false; 2784 } 2785 2786 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2787 ArgumentBootClassPath* bcp_p, 2788 bool* bcp_assembly_required_p, 2789 Flag::Flags origin) { 2790 // For match_option to return remaining or value part of option string 2791 const char* tail; 2792 2793 // iterate over arguments 2794 for (int index = 0; index < args->nOptions; index++) { 2795 bool is_absolute_path = false; // for -agentpath vs -agentlib 2796 2797 const JavaVMOption* option = args->options + index; 2798 2799 if (!match_option(option, "-Djava.class.path", &tail) && 2800 !match_option(option, "-Dsun.java.command", &tail) && 2801 !match_option(option, "-Dsun.java.launcher", &tail)) { 2802 2803 // add all jvm options to the jvm_args string. This string 2804 // is used later to set the java.vm.args PerfData string constant. 2805 // the -Djava.class.path and the -Dsun.java.command options are 2806 // omitted from jvm_args string as each have their own PerfData 2807 // string constant object. 2808 build_jvm_args(option->optionString); 2809 } 2810 2811 // -verbose:[class/gc/jni] 2812 if (match_option(option, "-verbose", &tail)) { 2813 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2814 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload)); 2815 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload)); 2816 } else if (!strcmp(tail, ":gc")) { 2817 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2818 } else if (!strcmp(tail, ":jni")) { 2819 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2820 return JNI_EINVAL; 2821 } 2822 } 2823 // -da / -ea / -disableassertions / -enableassertions 2824 // These accept an optional class/package name separated by a colon, e.g., 2825 // -da:java.lang.Thread. 2826 } else if (match_option(option, user_assertion_options, &tail, true)) { 2827 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2828 if (*tail == '\0') { 2829 JavaAssertions::setUserClassDefault(enable); 2830 } else { 2831 assert(*tail == ':', "bogus match by match_option()"); 2832 JavaAssertions::addOption(tail + 1, enable); 2833 } 2834 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2835 } else if (match_option(option, system_assertion_options, &tail, false)) { 2836 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2837 JavaAssertions::setSystemClassDefault(enable); 2838 // -bootclasspath: 2839 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2840 jio_fprintf(defaultStream::output_stream(), 2841 "-Xbootclasspath is no longer a supported option.\n"); 2842 return JNI_EINVAL; 2843 // -bootclasspath/a: 2844 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2845 bcp_p->add_suffix(tail); 2846 *bcp_assembly_required_p = true; 2847 // -bootclasspath/p: 2848 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2849 jio_fprintf(defaultStream::output_stream(), 2850 "-Xbootclasspath/p is no longer a supported option.\n"); 2851 return JNI_EINVAL; 2852 // -Xrun 2853 } else if (match_option(option, "-Xrun", &tail)) { 2854 if (tail != NULL) { 2855 const char* pos = strchr(tail, ':'); 2856 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2857 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2858 name[len] = '\0'; 2859 2860 char *options = NULL; 2861 if(pos != NULL) { 2862 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2863 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2864 } 2865 #if !INCLUDE_JVMTI 2866 if (strcmp(name, "jdwp") == 0) { 2867 jio_fprintf(defaultStream::error_stream(), 2868 "Debugging agents are not supported in this VM\n"); 2869 return JNI_ERR; 2870 } 2871 #endif // !INCLUDE_JVMTI 2872 add_init_library(name, options); 2873 } 2874 // -agentlib and -agentpath 2875 } else if (match_option(option, "-agentlib:", &tail) || 2876 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2877 if(tail != NULL) { 2878 const char* pos = strchr(tail, '='); 2879 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2880 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2881 name[len] = '\0'; 2882 2883 char *options = NULL; 2884 if(pos != NULL) { 2885 options = os::strdup_check_oom(pos + 1, mtInternal); 2886 } 2887 #if !INCLUDE_JVMTI 2888 if (valid_jdwp_agent(name, is_absolute_path)) { 2889 jio_fprintf(defaultStream::error_stream(), 2890 "Debugging agents are not supported in this VM\n"); 2891 return JNI_ERR; 2892 } 2893 #endif // !INCLUDE_JVMTI 2894 add_init_agent(name, options, is_absolute_path); 2895 } 2896 // -javaagent 2897 } else if (match_option(option, "-javaagent:", &tail)) { 2898 #if !INCLUDE_JVMTI 2899 jio_fprintf(defaultStream::error_stream(), 2900 "Instrumentation agents are not supported in this VM\n"); 2901 return JNI_ERR; 2902 #else 2903 if (tail != NULL) { 2904 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2905 add_init_agent("instrument", options, false); 2906 // java agents need module java.instrument. Also -addmods ALL-SYSTEM because 2907 // the java agent is in the unmamed module of the application class loader 2908 if (!Arguments::append_to_addmods_property("java.instrument,ALL-SYSTEM")) { 2909 return JNI_ENOMEM; 2910 } 2911 } 2912 #endif // !INCLUDE_JVMTI 2913 // -Xnoclassgc 2914 } else if (match_option(option, "-Xnoclassgc")) { 2915 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2916 return JNI_EINVAL; 2917 } 2918 // -Xconcgc 2919 } else if (match_option(option, "-Xconcgc")) { 2920 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2921 return JNI_EINVAL; 2922 } 2923 // -Xnoconcgc 2924 } else if (match_option(option, "-Xnoconcgc")) { 2925 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2926 return JNI_EINVAL; 2927 } 2928 // -Xbatch 2929 } else if (match_option(option, "-Xbatch")) { 2930 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2931 return JNI_EINVAL; 2932 } 2933 // -Xmn for compatibility with other JVM vendors 2934 } else if (match_option(option, "-Xmn", &tail)) { 2935 julong long_initial_young_size = 0; 2936 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2937 if (errcode != arg_in_range) { 2938 jio_fprintf(defaultStream::error_stream(), 2939 "Invalid initial young generation size: %s\n", option->optionString); 2940 describe_range_error(errcode); 2941 return JNI_EINVAL; 2942 } 2943 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2944 return JNI_EINVAL; 2945 } 2946 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2947 return JNI_EINVAL; 2948 } 2949 // -Xms 2950 } else if (match_option(option, "-Xms", &tail)) { 2951 julong long_initial_heap_size = 0; 2952 // an initial heap size of 0 means automatically determine 2953 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2954 if (errcode != arg_in_range) { 2955 jio_fprintf(defaultStream::error_stream(), 2956 "Invalid initial heap size: %s\n", option->optionString); 2957 describe_range_error(errcode); 2958 return JNI_EINVAL; 2959 } 2960 set_min_heap_size((size_t)long_initial_heap_size); 2961 // Currently the minimum size and the initial heap sizes are the same. 2962 // Can be overridden with -XX:InitialHeapSize. 2963 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2964 return JNI_EINVAL; 2965 } 2966 // -Xmx 2967 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2968 julong long_max_heap_size = 0; 2969 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2970 if (errcode != arg_in_range) { 2971 jio_fprintf(defaultStream::error_stream(), 2972 "Invalid maximum heap size: %s\n", option->optionString); 2973 describe_range_error(errcode); 2974 return JNI_EINVAL; 2975 } 2976 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2977 return JNI_EINVAL; 2978 } 2979 // Xmaxf 2980 } else if (match_option(option, "-Xmaxf", &tail)) { 2981 char* err; 2982 int maxf = (int)(strtod(tail, &err) * 100); 2983 if (*err != '\0' || *tail == '\0') { 2984 jio_fprintf(defaultStream::error_stream(), 2985 "Bad max heap free percentage size: %s\n", 2986 option->optionString); 2987 return JNI_EINVAL; 2988 } else { 2989 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2990 return JNI_EINVAL; 2991 } 2992 } 2993 // Xminf 2994 } else if (match_option(option, "-Xminf", &tail)) { 2995 char* err; 2996 int minf = (int)(strtod(tail, &err) * 100); 2997 if (*err != '\0' || *tail == '\0') { 2998 jio_fprintf(defaultStream::error_stream(), 2999 "Bad min heap free percentage size: %s\n", 3000 option->optionString); 3001 return JNI_EINVAL; 3002 } else { 3003 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3004 return JNI_EINVAL; 3005 } 3006 } 3007 // -Xss 3008 } else if (match_option(option, "-Xss", &tail)) { 3009 julong long_ThreadStackSize = 0; 3010 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3011 if (errcode != arg_in_range) { 3012 jio_fprintf(defaultStream::error_stream(), 3013 "Invalid thread stack size: %s\n", option->optionString); 3014 describe_range_error(errcode); 3015 return JNI_EINVAL; 3016 } 3017 // Internally track ThreadStackSize in units of 1024 bytes. 3018 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 3019 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 3020 return JNI_EINVAL; 3021 } 3022 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 3023 } else if (match_option(option, "-Xoss", &tail) || 3024 match_option(option, "-Xsqnopause") || 3025 match_option(option, "-Xoptimize") || 3026 match_option(option, "-Xboundthreads") || 3027 match_option(option, "-Xusealtsigs")) { 3028 // All these options are deprecated in JDK 9 and will be removed in a future release 3029 char version[256]; 3030 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3031 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3032 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3033 julong long_CodeCacheExpansionSize = 0; 3034 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3035 if (errcode != arg_in_range) { 3036 jio_fprintf(defaultStream::error_stream(), 3037 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3038 os::vm_page_size()/K); 3039 return JNI_EINVAL; 3040 } 3041 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3042 return JNI_EINVAL; 3043 } 3044 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3045 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3046 julong long_ReservedCodeCacheSize = 0; 3047 3048 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3049 if (errcode != arg_in_range) { 3050 jio_fprintf(defaultStream::error_stream(), 3051 "Invalid maximum code cache size: %s.\n", option->optionString); 3052 return JNI_EINVAL; 3053 } 3054 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3055 return JNI_EINVAL; 3056 } 3057 // -XX:NonNMethodCodeHeapSize= 3058 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3059 julong long_NonNMethodCodeHeapSize = 0; 3060 3061 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3062 if (errcode != arg_in_range) { 3063 jio_fprintf(defaultStream::error_stream(), 3064 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3065 return JNI_EINVAL; 3066 } 3067 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3068 return JNI_EINVAL; 3069 } 3070 // -XX:ProfiledCodeHeapSize= 3071 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3072 julong long_ProfiledCodeHeapSize = 0; 3073 3074 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3075 if (errcode != arg_in_range) { 3076 jio_fprintf(defaultStream::error_stream(), 3077 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3078 return JNI_EINVAL; 3079 } 3080 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3081 return JNI_EINVAL; 3082 } 3083 // -XX:NonProfiledCodeHeapSizee= 3084 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3085 julong long_NonProfiledCodeHeapSize = 0; 3086 3087 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3088 if (errcode != arg_in_range) { 3089 jio_fprintf(defaultStream::error_stream(), 3090 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3091 return JNI_EINVAL; 3092 } 3093 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3094 return JNI_EINVAL; 3095 } 3096 // -green 3097 } else if (match_option(option, "-green")) { 3098 jio_fprintf(defaultStream::error_stream(), 3099 "Green threads support not available\n"); 3100 return JNI_EINVAL; 3101 // -native 3102 } else if (match_option(option, "-native")) { 3103 // HotSpot always uses native threads, ignore silently for compatibility 3104 // -Xrs 3105 } else if (match_option(option, "-Xrs")) { 3106 // Classic/EVM option, new functionality 3107 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3108 return JNI_EINVAL; 3109 } 3110 // -Xprof 3111 } else if (match_option(option, "-Xprof")) { 3112 #if INCLUDE_FPROF 3113 _has_profile = true; 3114 #else // INCLUDE_FPROF 3115 jio_fprintf(defaultStream::error_stream(), 3116 "Flat profiling is not supported in this VM.\n"); 3117 return JNI_ERR; 3118 #endif // INCLUDE_FPROF 3119 // -Xconcurrentio 3120 } else if (match_option(option, "-Xconcurrentio")) { 3121 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3122 return JNI_EINVAL; 3123 } 3124 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3125 return JNI_EINVAL; 3126 } 3127 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3128 return JNI_EINVAL; 3129 } 3130 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3131 return JNI_EINVAL; 3132 } 3133 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3134 return JNI_EINVAL; 3135 } 3136 3137 // -Xinternalversion 3138 } else if (match_option(option, "-Xinternalversion")) { 3139 jio_fprintf(defaultStream::output_stream(), "%s\n", 3140 VM_Version::internal_vm_info_string()); 3141 vm_exit(0); 3142 #ifndef PRODUCT 3143 // -Xprintflags 3144 } else if (match_option(option, "-Xprintflags")) { 3145 CommandLineFlags::printFlags(tty, false); 3146 vm_exit(0); 3147 #endif 3148 // -D 3149 } else if (match_option(option, "-D", &tail)) { 3150 const char* value; 3151 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3152 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3153 // abort if -Djava.endorsed.dirs is set 3154 jio_fprintf(defaultStream::output_stream(), 3155 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3156 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3157 return JNI_EINVAL; 3158 } 3159 if (match_option(option, "-Djava.ext.dirs=", &value) && 3160 *value != '\0' && strcmp(value, "\"\"") != 0) { 3161 // abort if -Djava.ext.dirs is set 3162 jio_fprintf(defaultStream::output_stream(), 3163 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3164 return JNI_EINVAL; 3165 } 3166 3167 if (!add_property(tail)) { 3168 return JNI_ENOMEM; 3169 } 3170 // Out of the box management support 3171 if (match_option(option, "-Dcom.sun.management", &tail)) { 3172 #if INCLUDE_MANAGEMENT 3173 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3174 return JNI_EINVAL; 3175 } 3176 // management agent in module java.management 3177 if (!Arguments::append_to_addmods_property("java.management")) { 3178 return JNI_ENOMEM; 3179 } 3180 #else 3181 jio_fprintf(defaultStream::output_stream(), 3182 "-Dcom.sun.management is not supported in this VM.\n"); 3183 return JNI_ERR; 3184 #endif 3185 } 3186 if (match_option(option, "-Djdk.launcher.patch.0=", &tail)) { 3187 // -Xpatch 3188 int dir_count; 3189 char** patch_dirs = os::split_path(tail, &dir_count); 3190 if (patch_dirs == NULL) { 3191 jio_fprintf(defaultStream::output_stream(), 3192 "Bad value for -Xpatch.\n"); 3193 return JNI_ERR; 3194 } 3195 set_patch_dirs(patch_dirs); 3196 set_patch_dirs_count(dir_count); 3197 3198 // Create a path for each patch dir consisting of dir/java.base. 3199 char file_sep = os::file_separator()[0]; 3200 for (int x = 0; x < dir_count; x++) { 3201 // Really shouldn't be NULL, but check can't hurt 3202 if (patch_dirs[x] != NULL) { 3203 size_t len = strlen(patch_dirs[x]); 3204 if (len != 0) { // Ignore empty strings. 3205 len += 11; // file_sep + "java.base" + null terminator. 3206 char* dir = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3207 jio_snprintf(dir, len, "%s%cjava.base", patch_dirs[x], file_sep); 3208 3209 // See if Xpatch module path exists. 3210 struct stat st; 3211 if ((os::stat(dir, &st) == 0)) { 3212 bcp_p->add_prefix(dir); 3213 *bcp_assembly_required_p = true; 3214 } 3215 FREE_C_HEAP_ARRAY(char, dir); 3216 } 3217 } 3218 } 3219 } 3220 // -Xint 3221 } else if (match_option(option, "-Xint")) { 3222 set_mode_flags(_int); 3223 // -Xmixed 3224 } else if (match_option(option, "-Xmixed")) { 3225 set_mode_flags(_mixed); 3226 // -Xcomp 3227 } else if (match_option(option, "-Xcomp")) { 3228 // for testing the compiler; turn off all flags that inhibit compilation 3229 set_mode_flags(_comp); 3230 // -Xshare:dump 3231 } else if (match_option(option, "-Xshare:dump")) { 3232 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3233 return JNI_EINVAL; 3234 } 3235 set_mode_flags(_int); // Prevent compilation, which creates objects 3236 // -Xshare:on 3237 } else if (match_option(option, "-Xshare:on")) { 3238 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3239 return JNI_EINVAL; 3240 } 3241 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3242 return JNI_EINVAL; 3243 } 3244 // -Xshare:auto 3245 } else if (match_option(option, "-Xshare:auto")) { 3246 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3247 return JNI_EINVAL; 3248 } 3249 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3250 return JNI_EINVAL; 3251 } 3252 // -Xshare:off 3253 } else if (match_option(option, "-Xshare:off")) { 3254 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3255 return JNI_EINVAL; 3256 } 3257 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3258 return JNI_EINVAL; 3259 } 3260 // -Xverify 3261 } else if (match_option(option, "-Xverify", &tail)) { 3262 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3263 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3264 return JNI_EINVAL; 3265 } 3266 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3267 return JNI_EINVAL; 3268 } 3269 } else if (strcmp(tail, ":remote") == 0) { 3270 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3271 return JNI_EINVAL; 3272 } 3273 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3274 return JNI_EINVAL; 3275 } 3276 } else if (strcmp(tail, ":none") == 0) { 3277 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3278 return JNI_EINVAL; 3279 } 3280 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3281 return JNI_EINVAL; 3282 } 3283 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3284 return JNI_EINVAL; 3285 } 3286 // -Xdebug 3287 } else if (match_option(option, "-Xdebug")) { 3288 // note this flag has been used, then ignore 3289 set_xdebug_mode(true); 3290 // -Xnoagent 3291 } else if (match_option(option, "-Xnoagent")) { 3292 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3293 } else if (match_option(option, "-Xloggc:", &tail)) { 3294 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3295 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3296 _gc_log_filename = os::strdup_check_oom(tail); 3297 } else if (match_option(option, "-Xlog", &tail)) { 3298 bool ret = false; 3299 if (strcmp(tail, ":help") == 0) { 3300 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3301 vm_exit(0); 3302 } else if (strcmp(tail, ":disable") == 0) { 3303 LogConfiguration::disable_logging(); 3304 ret = true; 3305 } else if (*tail == '\0') { 3306 ret = LogConfiguration::parse_command_line_arguments(); 3307 assert(ret, "-Xlog without arguments should never fail to parse"); 3308 } else if (*tail == ':') { 3309 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3310 } 3311 if (ret == false) { 3312 jio_fprintf(defaultStream::error_stream(), 3313 "Invalid -Xlog option '-Xlog%s'\n", 3314 tail); 3315 return JNI_EINVAL; 3316 } 3317 // JNI hooks 3318 } else if (match_option(option, "-Xcheck", &tail)) { 3319 if (!strcmp(tail, ":jni")) { 3320 #if !INCLUDE_JNI_CHECK 3321 warning("JNI CHECKING is not supported in this VM"); 3322 #else 3323 CheckJNICalls = true; 3324 #endif // INCLUDE_JNI_CHECK 3325 } else if (is_bad_option(option, args->ignoreUnrecognized, 3326 "check")) { 3327 return JNI_EINVAL; 3328 } 3329 } else if (match_option(option, "vfprintf")) { 3330 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3331 } else if (match_option(option, "exit")) { 3332 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3333 } else if (match_option(option, "abort")) { 3334 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3335 // -XX:+AggressiveHeap 3336 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3337 jint result = set_aggressive_heap_flags(); 3338 if (result != JNI_OK) { 3339 return result; 3340 } 3341 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3342 // and the last option wins. 3343 } else if (match_option(option, "-XX:+NeverTenure")) { 3344 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3345 return JNI_EINVAL; 3346 } 3347 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3348 return JNI_EINVAL; 3349 } 3350 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3351 return JNI_EINVAL; 3352 } 3353 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3354 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3355 return JNI_EINVAL; 3356 } 3357 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3358 return JNI_EINVAL; 3359 } 3360 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3361 return JNI_EINVAL; 3362 } 3363 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3364 uintx max_tenuring_thresh = 0; 3365 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3366 jio_fprintf(defaultStream::error_stream(), 3367 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3368 return JNI_EINVAL; 3369 } 3370 3371 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3372 return JNI_EINVAL; 3373 } 3374 3375 if (MaxTenuringThreshold == 0) { 3376 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3377 return JNI_EINVAL; 3378 } 3379 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3380 return JNI_EINVAL; 3381 } 3382 } else { 3383 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3384 return JNI_EINVAL; 3385 } 3386 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3387 return JNI_EINVAL; 3388 } 3389 } 3390 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3391 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3392 return JNI_EINVAL; 3393 } 3394 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3395 return JNI_EINVAL; 3396 } 3397 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3398 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3399 return JNI_EINVAL; 3400 } 3401 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3402 return JNI_EINVAL; 3403 } 3404 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3405 #if defined(DTRACE_ENABLED) 3406 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3407 return JNI_EINVAL; 3408 } 3409 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3410 return JNI_EINVAL; 3411 } 3412 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3413 return JNI_EINVAL; 3414 } 3415 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3416 return JNI_EINVAL; 3417 } 3418 #else // defined(DTRACE_ENABLED) 3419 jio_fprintf(defaultStream::error_stream(), 3420 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3421 return JNI_EINVAL; 3422 #endif // defined(DTRACE_ENABLED) 3423 #ifdef ASSERT 3424 } else if (match_option(option, "-XX:+FullGCALot")) { 3425 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3426 return JNI_EINVAL; 3427 } 3428 // disable scavenge before parallel mark-compact 3429 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3430 return JNI_EINVAL; 3431 } 3432 #endif 3433 #if !INCLUDE_MANAGEMENT 3434 } else if (match_option(option, "-XX:+ManagementServer")) { 3435 jio_fprintf(defaultStream::error_stream(), 3436 "ManagementServer is not supported in this VM.\n"); 3437 return JNI_ERR; 3438 #endif // INCLUDE_MANAGEMENT 3439 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3440 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3441 // already been handled 3442 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3443 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3444 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3445 return JNI_EINVAL; 3446 } 3447 } 3448 // Unknown option 3449 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3450 return JNI_ERR; 3451 } 3452 } 3453 3454 // PrintSharedArchiveAndExit will turn on 3455 // -Xshare:on 3456 // -Xlog:classpath=info 3457 if (PrintSharedArchiveAndExit) { 3458 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3459 return JNI_EINVAL; 3460 } 3461 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3462 return JNI_EINVAL; 3463 } 3464 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classpath)); 3465 } 3466 3467 // Change the default value for flags which have different default values 3468 // when working with older JDKs. 3469 #ifdef LINUX 3470 if (JDK_Version::current().compare_major(6) <= 0 && 3471 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3472 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3473 } 3474 #endif // LINUX 3475 fix_appclasspath(); 3476 return JNI_OK; 3477 } 3478 3479 // Set property jdk.boot.class.path.append to the contents of the bootclasspath 3480 // that follows either the jimage file or exploded module directories. The 3481 // property will contain -Xbootclasspath/a and/or jvmti appended additions. 3482 void Arguments::set_jdkbootclasspath_append() { 3483 char *sysclasspath = get_sysclasspath(); 3484 assert(sysclasspath != NULL, "NULL sysclasspath"); 3485 int bcp_a_idx = bootclassloader_append_index(); 3486 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) { 3487 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx); 3488 } 3489 } 3490 3491 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3492 // 3493 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3494 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3495 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3496 // path is treated as the current directory. 3497 // 3498 // This causes problems with CDS, which requires that all directories specified in the classpath 3499 // must be empty. In most cases, applications do NOT want to load classes from the current 3500 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3501 // scripts compatible with CDS. 3502 void Arguments::fix_appclasspath() { 3503 if (IgnoreEmptyClassPaths) { 3504 const char separator = *os::path_separator(); 3505 const char* src = _java_class_path->value(); 3506 3507 // skip over all the leading empty paths 3508 while (*src == separator) { 3509 src ++; 3510 } 3511 3512 char* copy = os::strdup_check_oom(src, mtInternal); 3513 3514 // trim all trailing empty paths 3515 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3516 *tail = '\0'; 3517 } 3518 3519 char from[3] = {separator, separator, '\0'}; 3520 char to [2] = {separator, '\0'}; 3521 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3522 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3523 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3524 } 3525 3526 _java_class_path->set_writeable_value(copy); 3527 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3528 } 3529 } 3530 3531 static bool has_jar_files(const char* directory) { 3532 DIR* dir = os::opendir(directory); 3533 if (dir == NULL) return false; 3534 3535 struct dirent *entry; 3536 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3537 bool hasJarFile = false; 3538 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3539 const char* name = entry->d_name; 3540 const char* ext = name + strlen(name) - 4; 3541 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3542 } 3543 FREE_C_HEAP_ARRAY(char, dbuf); 3544 os::closedir(dir); 3545 return hasJarFile ; 3546 } 3547 3548 static int check_non_empty_dirs(const char* path) { 3549 const char separator = *os::path_separator(); 3550 const char* const end = path + strlen(path); 3551 int nonEmptyDirs = 0; 3552 while (path < end) { 3553 const char* tmp_end = strchr(path, separator); 3554 if (tmp_end == NULL) { 3555 if (has_jar_files(path)) { 3556 nonEmptyDirs++; 3557 jio_fprintf(defaultStream::output_stream(), 3558 "Non-empty directory: %s\n", path); 3559 } 3560 path = end; 3561 } else { 3562 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3563 memcpy(dirpath, path, tmp_end - path); 3564 dirpath[tmp_end - path] = '\0'; 3565 if (has_jar_files(dirpath)) { 3566 nonEmptyDirs++; 3567 jio_fprintf(defaultStream::output_stream(), 3568 "Non-empty directory: %s\n", dirpath); 3569 } 3570 FREE_C_HEAP_ARRAY(char, dirpath); 3571 path = tmp_end + 1; 3572 } 3573 } 3574 return nonEmptyDirs; 3575 } 3576 3577 jint Arguments::finalize_vm_init_args(ArgumentBootClassPath* bcp_p, bool bcp_assembly_required) { 3578 // check if the default lib/endorsed directory exists; if so, error 3579 char path[JVM_MAXPATHLEN]; 3580 const char* fileSep = os::file_separator(); 3581 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3582 3583 if (CheckEndorsedAndExtDirs) { 3584 int nonEmptyDirs = 0; 3585 // check endorsed directory 3586 nonEmptyDirs += check_non_empty_dirs(path); 3587 // check the extension directories 3588 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3589 if (nonEmptyDirs > 0) { 3590 return JNI_ERR; 3591 } 3592 } 3593 3594 DIR* dir = os::opendir(path); 3595 if (dir != NULL) { 3596 jio_fprintf(defaultStream::output_stream(), 3597 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3598 "in modular form will be supported via the concept of upgradeable modules.\n"); 3599 os::closedir(dir); 3600 return JNI_ERR; 3601 } 3602 3603 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3604 dir = os::opendir(path); 3605 if (dir != NULL) { 3606 jio_fprintf(defaultStream::output_stream(), 3607 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3608 "Use -classpath instead.\n."); 3609 os::closedir(dir); 3610 return JNI_ERR; 3611 } 3612 3613 if (bcp_assembly_required) { 3614 // Assemble the bootclasspath elements into the final path. 3615 char *combined_path = bcp_p->combined_path(); 3616 Arguments::set_sysclasspath(combined_path); 3617 FREE_C_HEAP_ARRAY(char, combined_path); 3618 } else { 3619 // At this point in sysclasspath processing anything 3620 // added would be considered in the boot loader's append path. 3621 // Record this index, including +1 for the file separator character. 3622 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1); 3623 } 3624 3625 // This must be done after all arguments have been processed. 3626 // java_compiler() true means set to "NONE" or empty. 3627 if (java_compiler() && !xdebug_mode()) { 3628 // For backwards compatibility, we switch to interpreted mode if 3629 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3630 // not specified. 3631 set_mode_flags(_int); 3632 } 3633 3634 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3635 // but like -Xint, leave compilation thresholds unaffected. 3636 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3637 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3638 set_mode_flags(_int); 3639 } 3640 3641 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3642 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3643 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3644 } 3645 3646 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3647 // Don't degrade server performance for footprint 3648 if (FLAG_IS_DEFAULT(UseLargePages) && 3649 MaxHeapSize < LargePageHeapSizeThreshold) { 3650 // No need for large granularity pages w/small heaps. 3651 // Note that large pages are enabled/disabled for both the 3652 // Java heap and the code cache. 3653 FLAG_SET_DEFAULT(UseLargePages, false); 3654 } 3655 3656 #elif defined(COMPILER2) 3657 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3658 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3659 } 3660 #endif 3661 3662 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3663 UNSUPPORTED_OPTION(ProfileInterpreter); 3664 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3665 #endif 3666 3667 #ifndef TIERED 3668 // Tiered compilation is undefined. 3669 UNSUPPORTED_OPTION(TieredCompilation); 3670 #endif 3671 3672 // If we are running in a headless jre, force java.awt.headless property 3673 // to be true unless the property has already been set. 3674 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3675 if (os::is_headless_jre()) { 3676 const char* headless = Arguments::get_property("java.awt.headless"); 3677 if (headless == NULL) { 3678 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3679 if (headless_env == NULL) { 3680 if (!add_property("java.awt.headless=true")) { 3681 return JNI_ENOMEM; 3682 } 3683 } else { 3684 char buffer[256]; 3685 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3686 if (!add_property(buffer)) { 3687 return JNI_ENOMEM; 3688 } 3689 } 3690 } 3691 } 3692 3693 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3694 // CMS can only be used with ParNew 3695 FLAG_SET_ERGO(bool, UseParNewGC, true); 3696 } 3697 3698 if (!check_vm_args_consistency()) { 3699 return JNI_ERR; 3700 } 3701 3702 return JNI_OK; 3703 } 3704 3705 // Helper class for controlling the lifetime of JavaVMInitArgs 3706 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3707 // deleted on the destruction of the ScopedVMInitArgs object. 3708 class ScopedVMInitArgs : public StackObj { 3709 private: 3710 JavaVMInitArgs _args; 3711 char* _container_name; 3712 bool _is_set; 3713 char* _vm_options_file_arg; 3714 3715 public: 3716 ScopedVMInitArgs(const char *container_name) { 3717 _args.version = JNI_VERSION_1_2; 3718 _args.nOptions = 0; 3719 _args.options = NULL; 3720 _args.ignoreUnrecognized = false; 3721 _container_name = (char *)container_name; 3722 _is_set = false; 3723 _vm_options_file_arg = NULL; 3724 } 3725 3726 // Populates the JavaVMInitArgs object represented by this 3727 // ScopedVMInitArgs object with the arguments in options. The 3728 // allocated memory is deleted by the destructor. If this method 3729 // returns anything other than JNI_OK, then this object is in a 3730 // partially constructed state, and should be abandoned. 3731 jint set_args(GrowableArray<JavaVMOption>* options) { 3732 _is_set = true; 3733 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3734 JavaVMOption, options->length(), mtInternal); 3735 if (options_arr == NULL) { 3736 return JNI_ENOMEM; 3737 } 3738 _args.options = options_arr; 3739 3740 for (int i = 0; i < options->length(); i++) { 3741 options_arr[i] = options->at(i); 3742 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3743 if (options_arr[i].optionString == NULL) { 3744 // Rely on the destructor to do cleanup. 3745 _args.nOptions = i; 3746 return JNI_ENOMEM; 3747 } 3748 } 3749 3750 _args.nOptions = options->length(); 3751 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3752 return JNI_OK; 3753 } 3754 3755 JavaVMInitArgs* get() { return &_args; } 3756 char* container_name() { return _container_name; } 3757 bool is_set() { return _is_set; } 3758 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3759 char* vm_options_file_arg() { return _vm_options_file_arg; } 3760 3761 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3762 if (_vm_options_file_arg != NULL) { 3763 os::free(_vm_options_file_arg); 3764 } 3765 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3766 } 3767 3768 ~ScopedVMInitArgs() { 3769 if (_vm_options_file_arg != NULL) { 3770 os::free(_vm_options_file_arg); 3771 } 3772 if (_args.options == NULL) return; 3773 for (int i = 0; i < _args.nOptions; i++) { 3774 os::free(_args.options[i].optionString); 3775 } 3776 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3777 } 3778 3779 // Insert options into this option list, to replace option at 3780 // vm_options_file_pos (-XX:VMOptionsFile) 3781 jint insert(const JavaVMInitArgs* args, 3782 const JavaVMInitArgs* args_to_insert, 3783 const int vm_options_file_pos) { 3784 assert(_args.options == NULL, "shouldn't be set yet"); 3785 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3786 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3787 3788 int length = args->nOptions + args_to_insert->nOptions - 1; 3789 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) 3790 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3791 for (int i = 0; i < args->nOptions; i++) { 3792 if (i == vm_options_file_pos) { 3793 // insert the new options starting at the same place as the 3794 // -XX:VMOptionsFile option 3795 for (int j = 0; j < args_to_insert->nOptions; j++) { 3796 options->push(args_to_insert->options[j]); 3797 } 3798 } else { 3799 options->push(args->options[i]); 3800 } 3801 } 3802 // make into options array 3803 jint result = set_args(options); 3804 delete options; 3805 return result; 3806 } 3807 }; 3808 3809 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3810 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3811 } 3812 3813 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3814 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3815 } 3816 3817 jint Arguments::parse_options_environment_variable(const char* name, 3818 ScopedVMInitArgs* vm_args) { 3819 char *buffer = ::getenv(name); 3820 3821 // Don't check this environment variable if user has special privileges 3822 // (e.g. unix su command). 3823 if (buffer == NULL || os::have_special_privileges()) { 3824 return JNI_OK; 3825 } 3826 3827 if ((buffer = os::strdup(buffer)) == NULL) { 3828 return JNI_ENOMEM; 3829 } 3830 3831 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3832 3833 os::free(buffer); 3834 return retcode; 3835 } 3836 3837 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3838 // read file into buffer 3839 int fd = ::open(file_name, O_RDONLY); 3840 if (fd < 0) { 3841 jio_fprintf(defaultStream::error_stream(), 3842 "Could not open options file '%s'\n", 3843 file_name); 3844 return JNI_ERR; 3845 } 3846 3847 struct stat stbuf; 3848 int retcode = os::stat(file_name, &stbuf); 3849 if (retcode != 0) { 3850 jio_fprintf(defaultStream::error_stream(), 3851 "Could not stat options file '%s'\n", 3852 file_name); 3853 os::close(fd); 3854 return JNI_ERR; 3855 } 3856 3857 if (stbuf.st_size == 0) { 3858 // tell caller there is no option data and that is ok 3859 os::close(fd); 3860 return JNI_OK; 3861 } 3862 3863 // '+ 1' for NULL termination even with max bytes 3864 size_t bytes_alloc = stbuf.st_size + 1; 3865 3866 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal); 3867 if (NULL == buf) { 3868 jio_fprintf(defaultStream::error_stream(), 3869 "Could not allocate read buffer for options file parse\n"); 3870 os::close(fd); 3871 return JNI_ENOMEM; 3872 } 3873 3874 memset(buf, 0, bytes_alloc); 3875 3876 // Fill buffer 3877 // Use ::read() instead of os::read because os::read() 3878 // might do a thread state transition 3879 // and it is too early for that here 3880 3881 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3882 os::close(fd); 3883 if (bytes_read < 0) { 3884 FREE_C_HEAP_ARRAY(char, buf); 3885 jio_fprintf(defaultStream::error_stream(), 3886 "Could not read options file '%s'\n", file_name); 3887 return JNI_ERR; 3888 } 3889 3890 if (bytes_read == 0) { 3891 // tell caller there is no option data and that is ok 3892 FREE_C_HEAP_ARRAY(char, buf); 3893 return JNI_OK; 3894 } 3895 3896 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3897 3898 FREE_C_HEAP_ARRAY(char, buf); 3899 return retcode; 3900 } 3901 3902 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3903 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3904 3905 // some pointers to help with parsing 3906 char *buffer_end = buffer + buf_len; 3907 char *opt_hd = buffer; 3908 char *wrt = buffer; 3909 char *rd = buffer; 3910 3911 // parse all options 3912 while (rd < buffer_end) { 3913 // skip leading white space from the input string 3914 while (rd < buffer_end && isspace(*rd)) { 3915 rd++; 3916 } 3917 3918 if (rd >= buffer_end) { 3919 break; 3920 } 3921 3922 // Remember this is where we found the head of the token. 3923 opt_hd = wrt; 3924 3925 // Tokens are strings of non white space characters separated 3926 // by one or more white spaces. 3927 while (rd < buffer_end && !isspace(*rd)) { 3928 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3929 int quote = *rd; // matching quote to look for 3930 rd++; // don't copy open quote 3931 while (rd < buffer_end && *rd != quote) { 3932 // include everything (even spaces) 3933 // up until the close quote 3934 *wrt++ = *rd++; // copy to option string 3935 } 3936 3937 if (rd < buffer_end) { 3938 rd++; // don't copy close quote 3939 } else { 3940 // did not see closing quote 3941 jio_fprintf(defaultStream::error_stream(), 3942 "Unmatched quote in %s\n", name); 3943 delete options; 3944 return JNI_ERR; 3945 } 3946 } else { 3947 *wrt++ = *rd++; // copy to option string 3948 } 3949 } 3950 3951 // steal a white space character and set it to NULL 3952 *wrt++ = '\0'; 3953 // We now have a complete token 3954 3955 JavaVMOption option; 3956 option.optionString = opt_hd; 3957 option.extraInfo = NULL; 3958 3959 options->append(option); // Fill in option 3960 3961 rd++; // Advance to next character 3962 } 3963 3964 // Fill out JavaVMInitArgs structure. 3965 jint status = vm_args->set_args(options); 3966 3967 delete options; 3968 return status; 3969 } 3970 3971 void Arguments::set_shared_spaces_flags() { 3972 if (DumpSharedSpaces) { 3973 if (Arguments::patch_dirs() != NULL) { 3974 vm_exit_during_initialization( 3975 "Cannot use the following option when dumping the shared archive", "-Xpatch"); 3976 } 3977 3978 if (RequireSharedSpaces) { 3979 warning("Cannot dump shared archive while using shared archive"); 3980 } 3981 UseSharedSpaces = false; 3982 #ifdef _LP64 3983 if (!UseCompressedOops || !UseCompressedClassPointers) { 3984 vm_exit_during_initialization( 3985 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3986 } 3987 } else { 3988 if (!UseCompressedOops || !UseCompressedClassPointers) { 3989 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3990 } 3991 #endif 3992 } 3993 } 3994 3995 // Sharing support 3996 // Construct the path to the archive 3997 static char* get_shared_archive_path() { 3998 char *shared_archive_path; 3999 if (SharedArchiveFile == NULL) { 4000 char jvm_path[JVM_MAXPATHLEN]; 4001 os::jvm_path(jvm_path, sizeof(jvm_path)); 4002 char *end = strrchr(jvm_path, *os::file_separator()); 4003 if (end != NULL) *end = '\0'; 4004 size_t jvm_path_len = strlen(jvm_path); 4005 size_t file_sep_len = strlen(os::file_separator()); 4006 const size_t len = jvm_path_len + file_sep_len + 20; 4007 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 4008 if (shared_archive_path != NULL) { 4009 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 4010 jvm_path, os::file_separator()); 4011 } 4012 } else { 4013 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 4014 } 4015 return shared_archive_path; 4016 } 4017 4018 #ifndef PRODUCT 4019 // Determine whether LogVMOutput should be implicitly turned on. 4020 static bool use_vm_log() { 4021 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4022 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4023 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4024 PrintAssembly || TraceDeoptimization || TraceDependencies || 4025 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4026 return true; 4027 } 4028 4029 #ifdef COMPILER1 4030 if (PrintC1Statistics) { 4031 return true; 4032 } 4033 #endif // COMPILER1 4034 4035 #ifdef COMPILER2 4036 if (PrintOptoAssembly || PrintOptoStatistics) { 4037 return true; 4038 } 4039 #endif // COMPILER2 4040 4041 return false; 4042 } 4043 4044 #endif // PRODUCT 4045 4046 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4047 for (int index = 0; index < args->nOptions; index++) { 4048 const JavaVMOption* option = args->options + index; 4049 const char* tail; 4050 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4051 return true; 4052 } 4053 } 4054 return false; 4055 } 4056 4057 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4058 const char* vm_options_file, 4059 const int vm_options_file_pos, 4060 ScopedVMInitArgs* vm_options_file_args, 4061 ScopedVMInitArgs* args_out) { 4062 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4063 if (code != JNI_OK) { 4064 return code; 4065 } 4066 4067 if (vm_options_file_args->get()->nOptions < 1) { 4068 return JNI_OK; 4069 } 4070 4071 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4072 jio_fprintf(defaultStream::error_stream(), 4073 "A VM options file may not refer to a VM options file. " 4074 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4075 "options file '%s' in options container '%s' is an error.\n", 4076 vm_options_file_args->vm_options_file_arg(), 4077 vm_options_file_args->container_name()); 4078 return JNI_EINVAL; 4079 } 4080 4081 return args_out->insert(args, vm_options_file_args->get(), 4082 vm_options_file_pos); 4083 } 4084 4085 // Expand -XX:VMOptionsFile found in args_in as needed. 4086 // mod_args and args_out parameters may return values as needed. 4087 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4088 ScopedVMInitArgs* mod_args, 4089 JavaVMInitArgs** args_out) { 4090 jint code = match_special_option_and_act(args_in, mod_args); 4091 if (code != JNI_OK) { 4092 return code; 4093 } 4094 4095 if (mod_args->is_set()) { 4096 // args_in contains -XX:VMOptionsFile and mod_args contains the 4097 // original options from args_in along with the options expanded 4098 // from the VMOptionsFile. Return a short-hand to the caller. 4099 *args_out = mod_args->get(); 4100 } else { 4101 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4102 } 4103 return JNI_OK; 4104 } 4105 4106 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4107 ScopedVMInitArgs* args_out) { 4108 // Remaining part of option string 4109 const char* tail; 4110 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4111 4112 for (int index = 0; index < args->nOptions; index++) { 4113 const JavaVMOption* option = args->options + index; 4114 if (ArgumentsExt::process_options(option)) { 4115 continue; 4116 } 4117 if (match_option(option, "-XX:Flags=", &tail)) { 4118 Arguments::set_jvm_flags_file(tail); 4119 continue; 4120 } 4121 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4122 if (vm_options_file_args.found_vm_options_file_arg()) { 4123 jio_fprintf(defaultStream::error_stream(), 4124 "The option '%s' is already specified in the options " 4125 "container '%s' so the specification of '%s' in the " 4126 "same options container is an error.\n", 4127 vm_options_file_args.vm_options_file_arg(), 4128 vm_options_file_args.container_name(), 4129 option->optionString); 4130 return JNI_EINVAL; 4131 } 4132 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4133 // If there's a VMOptionsFile, parse that 4134 jint code = insert_vm_options_file(args, tail, index, 4135 &vm_options_file_args, args_out); 4136 if (code != JNI_OK) { 4137 return code; 4138 } 4139 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4140 if (args_out->is_set()) { 4141 // The VMOptions file inserted some options so switch 'args' 4142 // to the new set of options, and continue processing which 4143 // preserves "last option wins" semantics. 4144 args = args_out->get(); 4145 // The first option from the VMOptionsFile replaces the 4146 // current option. So we back track to process the 4147 // replacement option. 4148 index--; 4149 } 4150 continue; 4151 } 4152 if (match_option(option, "-XX:+PrintVMOptions")) { 4153 PrintVMOptions = true; 4154 continue; 4155 } 4156 if (match_option(option, "-XX:-PrintVMOptions")) { 4157 PrintVMOptions = false; 4158 continue; 4159 } 4160 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4161 IgnoreUnrecognizedVMOptions = true; 4162 continue; 4163 } 4164 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4165 IgnoreUnrecognizedVMOptions = false; 4166 continue; 4167 } 4168 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4169 CommandLineFlags::printFlags(tty, false); 4170 vm_exit(0); 4171 } 4172 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4173 #if INCLUDE_NMT 4174 // The launcher did not setup nmt environment variable properly. 4175 if (!MemTracker::check_launcher_nmt_support(tail)) { 4176 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4177 } 4178 4179 // Verify if nmt option is valid. 4180 if (MemTracker::verify_nmt_option()) { 4181 // Late initialization, still in single-threaded mode. 4182 if (MemTracker::tracking_level() >= NMT_summary) { 4183 MemTracker::init(); 4184 } 4185 } else { 4186 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4187 } 4188 continue; 4189 #else 4190 jio_fprintf(defaultStream::error_stream(), 4191 "Native Memory Tracking is not supported in this VM\n"); 4192 return JNI_ERR; 4193 #endif 4194 } 4195 4196 #ifndef PRODUCT 4197 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4198 CommandLineFlags::printFlags(tty, true); 4199 vm_exit(0); 4200 } 4201 #endif 4202 } 4203 return JNI_OK; 4204 } 4205 4206 static void print_options(const JavaVMInitArgs *args) { 4207 const char* tail; 4208 for (int index = 0; index < args->nOptions; index++) { 4209 const JavaVMOption *option = args->options + index; 4210 if (match_option(option, "-XX:", &tail)) { 4211 logOption(tail); 4212 } 4213 } 4214 } 4215 4216 bool Arguments::handle_deprecated_print_gc_flags() { 4217 if (PrintGC) { 4218 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4219 } 4220 if (PrintGCDetails) { 4221 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4222 } 4223 4224 if (_gc_log_filename != NULL) { 4225 // -Xloggc was used to specify a filename 4226 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4227 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL); 4228 } else if (PrintGC || PrintGCDetails) { 4229 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4230 } 4231 return true; 4232 } 4233 4234 // Parse entry point called from JNI_CreateJavaVM 4235 4236 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4237 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4238 4239 // Initialize ranges and constraints 4240 CommandLineFlagRangeList::init(); 4241 CommandLineFlagConstraintList::init(); 4242 4243 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4244 const char* hotspotrc = ".hotspotrc"; 4245 bool settings_file_specified = false; 4246 bool needs_hotspotrc_warning = false; 4247 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4248 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4249 4250 // Pointers to current working set of containers 4251 JavaVMInitArgs* cur_cmd_args; 4252 JavaVMInitArgs* cur_java_options_args; 4253 JavaVMInitArgs* cur_java_tool_options_args; 4254 4255 // Containers for modified/expanded options 4256 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4257 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4258 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4259 4260 4261 jint code = 4262 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4263 if (code != JNI_OK) { 4264 return code; 4265 } 4266 4267 code = parse_java_options_environment_variable(&initial_java_options_args); 4268 if (code != JNI_OK) { 4269 return code; 4270 } 4271 4272 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4273 &mod_java_tool_options_args, 4274 &cur_java_tool_options_args); 4275 if (code != JNI_OK) { 4276 return code; 4277 } 4278 4279 code = expand_vm_options_as_needed(initial_cmd_args, 4280 &mod_cmd_args, 4281 &cur_cmd_args); 4282 if (code != JNI_OK) { 4283 return code; 4284 } 4285 4286 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4287 &mod_java_options_args, 4288 &cur_java_options_args); 4289 if (code != JNI_OK) { 4290 return code; 4291 } 4292 4293 const char* flags_file = Arguments::get_jvm_flags_file(); 4294 settings_file_specified = (flags_file != NULL); 4295 4296 if (IgnoreUnrecognizedVMOptions) { 4297 cur_cmd_args->ignoreUnrecognized = true; 4298 cur_java_tool_options_args->ignoreUnrecognized = true; 4299 cur_java_options_args->ignoreUnrecognized = true; 4300 } 4301 4302 // Parse specified settings file 4303 if (settings_file_specified) { 4304 if (!process_settings_file(flags_file, true, 4305 cur_cmd_args->ignoreUnrecognized)) { 4306 return JNI_EINVAL; 4307 } 4308 } else { 4309 #ifdef ASSERT 4310 // Parse default .hotspotrc settings file 4311 if (!process_settings_file(".hotspotrc", false, 4312 cur_cmd_args->ignoreUnrecognized)) { 4313 return JNI_EINVAL; 4314 } 4315 #else 4316 struct stat buf; 4317 if (os::stat(hotspotrc, &buf) == 0) { 4318 needs_hotspotrc_warning = true; 4319 } 4320 #endif 4321 } 4322 4323 if (PrintVMOptions) { 4324 print_options(cur_java_tool_options_args); 4325 print_options(cur_cmd_args); 4326 print_options(cur_java_options_args); 4327 } 4328 4329 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4330 jint result = parse_vm_init_args(cur_java_tool_options_args, 4331 cur_java_options_args, 4332 cur_cmd_args); 4333 4334 if (result != JNI_OK) { 4335 return result; 4336 } 4337 4338 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4339 SharedArchivePath = get_shared_archive_path(); 4340 if (SharedArchivePath == NULL) { 4341 return JNI_ENOMEM; 4342 } 4343 4344 // Set up VerifySharedSpaces 4345 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4346 VerifySharedSpaces = true; 4347 } 4348 4349 // Delay warning until here so that we've had a chance to process 4350 // the -XX:-PrintWarnings flag 4351 if (needs_hotspotrc_warning) { 4352 warning("%s file is present but has been ignored. " 4353 "Run with -XX:Flags=%s to load the file.", 4354 hotspotrc, hotspotrc); 4355 } 4356 4357 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4358 UNSUPPORTED_OPTION(UseLargePages); 4359 #endif 4360 4361 ArgumentsExt::report_unsupported_options(); 4362 4363 #ifndef PRODUCT 4364 if (TraceBytecodesAt != 0) { 4365 TraceBytecodes = true; 4366 } 4367 if (CountCompiledCalls) { 4368 if (UseCounterDecay) { 4369 warning("UseCounterDecay disabled because CountCalls is set"); 4370 UseCounterDecay = false; 4371 } 4372 } 4373 #endif // PRODUCT 4374 4375 if (ScavengeRootsInCode == 0) { 4376 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4377 warning("Forcing ScavengeRootsInCode non-zero"); 4378 } 4379 ScavengeRootsInCode = 1; 4380 } 4381 4382 if (!handle_deprecated_print_gc_flags()) { 4383 return JNI_EINVAL; 4384 } 4385 4386 // Set object alignment values. 4387 set_object_alignment(); 4388 4389 #if !INCLUDE_CDS 4390 if (DumpSharedSpaces || RequireSharedSpaces) { 4391 jio_fprintf(defaultStream::error_stream(), 4392 "Shared spaces are not supported in this VM\n"); 4393 return JNI_ERR; 4394 } 4395 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4396 warning("Shared spaces are not supported in this VM"); 4397 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4398 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4399 } 4400 no_shared_spaces("CDS Disabled"); 4401 #endif // INCLUDE_CDS 4402 4403 return JNI_OK; 4404 } 4405 4406 jint Arguments::apply_ergo() { 4407 4408 // Set flags based on ergonomics. 4409 set_ergonomics_flags(); 4410 4411 set_shared_spaces_flags(); 4412 4413 // Check the GC selections again. 4414 if (!check_gc_consistency()) { 4415 return JNI_EINVAL; 4416 } 4417 4418 if (TieredCompilation) { 4419 set_tiered_flags(); 4420 } else { 4421 int max_compilation_policy_choice = 1; 4422 #ifdef COMPILER2 4423 max_compilation_policy_choice = 2; 4424 #endif 4425 // Check if the policy is valid. 4426 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4427 vm_exit_during_initialization( 4428 "Incompatible compilation policy selected", NULL); 4429 } 4430 // Scale CompileThreshold 4431 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4432 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4433 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4434 } 4435 } 4436 4437 #ifdef COMPILER2 4438 #ifndef PRODUCT 4439 if (PrintIdealGraphLevel > 0) { 4440 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4441 } 4442 #endif 4443 #endif 4444 4445 // Set heap size based on available physical memory 4446 set_heap_size(); 4447 4448 ArgumentsExt::set_gc_specific_flags(); 4449 4450 // Initialize Metaspace flags and alignments 4451 Metaspace::ergo_initialize(); 4452 4453 // Set bytecode rewriting flags 4454 set_bytecode_flags(); 4455 4456 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4457 jint code = set_aggressive_opts_flags(); 4458 if (code != JNI_OK) { 4459 return code; 4460 } 4461 4462 // Turn off biased locking for locking debug mode flags, 4463 // which are subtly different from each other but neither works with 4464 // biased locking 4465 if (UseHeavyMonitors 4466 #ifdef COMPILER1 4467 || !UseFastLocking 4468 #endif // COMPILER1 4469 #if INCLUDE_JVMCI 4470 || !JVMCIUseFastLocking 4471 #endif 4472 ) { 4473 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4474 // flag set to true on command line; warn the user that they 4475 // can't enable biased locking here 4476 warning("Biased Locking is not supported with locking debug flags" 4477 "; ignoring UseBiasedLocking flag." ); 4478 } 4479 UseBiasedLocking = false; 4480 } 4481 4482 #ifdef CC_INTERP 4483 // Clear flags not supported on zero. 4484 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4485 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4486 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4487 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4488 #endif // CC_INTERP 4489 4490 #ifdef COMPILER2 4491 if (!EliminateLocks) { 4492 EliminateNestedLocks = false; 4493 } 4494 if (!Inline) { 4495 IncrementalInline = false; 4496 } 4497 #ifndef PRODUCT 4498 if (!IncrementalInline) { 4499 AlwaysIncrementalInline = false; 4500 } 4501 #endif 4502 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4503 // nothing to use the profiling, turn if off 4504 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4505 } 4506 #endif 4507 4508 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4509 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4510 DebugNonSafepoints = true; 4511 } 4512 4513 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4514 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4515 } 4516 4517 if (UseOnStackReplacement && !UseLoopCounter) { 4518 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4519 FLAG_SET_DEFAULT(UseLoopCounter, true); 4520 } 4521 4522 #ifndef PRODUCT 4523 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4524 if (use_vm_log()) { 4525 LogVMOutput = true; 4526 } 4527 } 4528 #endif // PRODUCT 4529 4530 if (PrintCommandLineFlags) { 4531 CommandLineFlags::printSetFlags(tty); 4532 } 4533 4534 // Apply CPU specific policy for the BiasedLocking 4535 if (UseBiasedLocking) { 4536 if (!VM_Version::use_biased_locking() && 4537 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4538 UseBiasedLocking = false; 4539 } 4540 } 4541 #ifdef COMPILER2 4542 if (!UseBiasedLocking || EmitSync != 0) { 4543 UseOptoBiasInlining = false; 4544 } 4545 #endif 4546 4547 return JNI_OK; 4548 } 4549 4550 jint Arguments::adjust_after_os() { 4551 if (UseNUMA) { 4552 if (UseParallelGC || UseParallelOldGC) { 4553 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4554 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4555 } 4556 } 4557 // UseNUMAInterleaving is set to ON for all collectors and 4558 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4559 // such as the parallel collector for Linux and Solaris will 4560 // interleave old gen and survivor spaces on top of NUMA 4561 // allocation policy for the eden space. 4562 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4563 // all platforms and ParallelGC on Windows will interleave all 4564 // of the heap spaces across NUMA nodes. 4565 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4566 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4567 } 4568 } 4569 return JNI_OK; 4570 } 4571 4572 int Arguments::PropertyList_count(SystemProperty* pl) { 4573 int count = 0; 4574 while(pl != NULL) { 4575 count++; 4576 pl = pl->next(); 4577 } 4578 return count; 4579 } 4580 4581 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4582 assert(key != NULL, "just checking"); 4583 SystemProperty* prop; 4584 for (prop = pl; prop != NULL; prop = prop->next()) { 4585 if (strcmp(key, prop->key()) == 0) return prop->value(); 4586 } 4587 return NULL; 4588 } 4589 4590 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4591 int count = 0; 4592 const char* ret_val = NULL; 4593 4594 while(pl != NULL) { 4595 if(count >= index) { 4596 ret_val = pl->key(); 4597 break; 4598 } 4599 count++; 4600 pl = pl->next(); 4601 } 4602 4603 return ret_val; 4604 } 4605 4606 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4607 int count = 0; 4608 char* ret_val = NULL; 4609 4610 while(pl != NULL) { 4611 if(count >= index) { 4612 ret_val = pl->value(); 4613 break; 4614 } 4615 count++; 4616 pl = pl->next(); 4617 } 4618 4619 return ret_val; 4620 } 4621 4622 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4623 SystemProperty* p = *plist; 4624 if (p == NULL) { 4625 *plist = new_p; 4626 } else { 4627 while (p->next() != NULL) { 4628 p = p->next(); 4629 } 4630 p->set_next(new_p); 4631 } 4632 } 4633 4634 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) { 4635 if (plist == NULL) 4636 return; 4637 4638 SystemProperty* new_p = new SystemProperty(k, v, true); 4639 PropertyList_add(plist, new_p); 4640 } 4641 4642 void Arguments::PropertyList_add(SystemProperty *element) { 4643 PropertyList_add(&_system_properties, element); 4644 } 4645 4646 // This add maintains unique property key in the list. 4647 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) { 4648 if (plist == NULL) 4649 return; 4650 4651 // If property key exist then update with new value. 4652 SystemProperty* prop; 4653 for (prop = *plist; prop != NULL; prop = prop->next()) { 4654 if (strcmp(k, prop->key()) == 0) { 4655 if (append) { 4656 prop->append_value(v); 4657 } else { 4658 prop->set_writeable_value(v); 4659 } 4660 return; 4661 } 4662 } 4663 4664 PropertyList_add(plist, k, v); 4665 } 4666 4667 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4668 // Returns true if all of the source pointed by src has been copied over to 4669 // the destination buffer pointed by buf. Otherwise, returns false. 4670 // Notes: 4671 // 1. If the length (buflen) of the destination buffer excluding the 4672 // NULL terminator character is not long enough for holding the expanded 4673 // pid characters, it also returns false instead of returning the partially 4674 // expanded one. 4675 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4676 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4677 char* buf, size_t buflen) { 4678 const char* p = src; 4679 char* b = buf; 4680 const char* src_end = &src[srclen]; 4681 char* buf_end = &buf[buflen - 1]; 4682 4683 while (p < src_end && b < buf_end) { 4684 if (*p == '%') { 4685 switch (*(++p)) { 4686 case '%': // "%%" ==> "%" 4687 *b++ = *p++; 4688 break; 4689 case 'p': { // "%p" ==> current process id 4690 // buf_end points to the character before the last character so 4691 // that we could write '\0' to the end of the buffer. 4692 size_t buf_sz = buf_end - b + 1; 4693 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4694 4695 // if jio_snprintf fails or the buffer is not long enough to hold 4696 // the expanded pid, returns false. 4697 if (ret < 0 || ret >= (int)buf_sz) { 4698 return false; 4699 } else { 4700 b += ret; 4701 assert(*b == '\0', "fail in copy_expand_pid"); 4702 if (p == src_end && b == buf_end + 1) { 4703 // reach the end of the buffer. 4704 return true; 4705 } 4706 } 4707 p++; 4708 break; 4709 } 4710 default : 4711 *b++ = '%'; 4712 } 4713 } else { 4714 *b++ = *p++; 4715 } 4716 } 4717 *b = '\0'; 4718 return (p == src_end); // return false if not all of the source was copied 4719 }