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