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/commandLineFlagWriteableList.hpp" 46 #include "runtime/commandLineFlagRangeList.hpp" 47 #include "runtime/globals.hpp" 48 #include "runtime/globals_extension.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/os.hpp" 51 #include "runtime/vm_version.hpp" 52 #include "services/management.hpp" 53 #include "services/memTracker.hpp" 54 #include "utilities/defaultStream.hpp" 55 #include "utilities/macros.hpp" 56 #include "utilities/stringUtils.hpp" 57 #if INCLUDE_JVMCI 58 #include "jvmci/jvmciRuntime.hpp" 59 #endif 60 #if INCLUDE_ALL_GCS 61 #include "gc/cms/compactibleFreeListSpace.hpp" 62 #include "gc/g1/g1CollectedHeap.inline.hpp" 63 #include "gc/parallel/parallelScavengeHeap.hpp" 64 #endif // INCLUDE_ALL_GCS 65 66 // Note: This is a special bug reporting site for the JVM 67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 68 #define DEFAULT_JAVA_LAUNCHER "generic" 69 70 char* Arguments::_jvm_flags_file = NULL; 71 char** Arguments::_jvm_flags_array = NULL; 72 int Arguments::_num_jvm_flags = 0; 73 char** Arguments::_jvm_args_array = NULL; 74 int Arguments::_num_jvm_args = 0; 75 char* Arguments::_java_command = NULL; 76 SystemProperty* Arguments::_system_properties = NULL; 77 const char* Arguments::_gc_log_filename = NULL; 78 bool Arguments::_has_profile = false; 79 size_t Arguments::_conservative_max_heap_alignment = 0; 80 size_t Arguments::_min_heap_size = 0; 81 Arguments::Mode Arguments::_mode = _mixed; 82 bool Arguments::_java_compiler = false; 83 bool Arguments::_xdebug_mode = false; 84 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 85 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 86 int Arguments::_sun_java_launcher_pid = -1; 87 bool Arguments::_sun_java_launcher_is_altjvm = false; 88 int Arguments::_bootclassloader_append_index = -1; 89 90 // These parameters are reset in method parse_vm_init_args() 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98 char* Arguments::SharedArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 abort_hook_t Arguments::_abort_hook = NULL; 104 exit_hook_t Arguments::_exit_hook = NULL; 105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108 SystemProperty *Arguments::_sun_boot_library_path = NULL; 109 SystemProperty *Arguments::_java_library_path = NULL; 110 SystemProperty *Arguments::_java_home = NULL; 111 SystemProperty *Arguments::_java_class_path = NULL; 112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 113 114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 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 bool needs_module_property_warning = false; 165 166 #define MODULE_PROPERTY_PREFIX "jdk.module" 167 #define MODULE_PROPERTY_PREFIX_LEN 10 168 #define MODULE_MAIN_PROPERTY "jdk.module.main" 169 #define MODULE_MAIN_PROPERTY_LEN 15 170 171 // Return TRUE if option matches property, or property=, or property.. 172 static bool matches_property_prefix(const char* option, const char* property, size_t len) { 173 return (strncmp(option, property, len) == 0) && 174 (option[len] == '=' || option[len] == '.' || option[len] == '\0'); 175 } 176 177 // Return true if the property is either "jdk.module" or starts with "jdk.module.", 178 // but does not start with "jdk.module.main". 179 // Return false if jdk.module.main because jdk.module.main and jdk.module.main.class 180 // are valid non-internal system properties. 181 // "property" should be passed without the leading "-D". 182 bool Arguments::is_internal_module_property(const char* property) { 183 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 184 return (matches_property_prefix(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) && 185 !matches_property_prefix(property, MODULE_MAIN_PROPERTY, MODULE_MAIN_PROPERTY_LEN)); 186 } 187 188 // Process java launcher properties. 189 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 190 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 191 // sun.java.launcher.pid is defined. 192 // Must do this before setting up other system properties, 193 // as some of them may depend on launcher type. 194 for (int index = 0; index < args->nOptions; index++) { 195 const JavaVMOption* option = args->options + index; 196 const char* tail; 197 198 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 199 process_java_launcher_argument(tail, option->extraInfo); 200 continue; 201 } 202 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 203 if (strcmp(tail, "true") == 0) { 204 _sun_java_launcher_is_altjvm = true; 205 } 206 continue; 207 } 208 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 209 _sun_java_launcher_pid = atoi(tail); 210 continue; 211 } 212 } 213 } 214 215 // Initialize system properties key and value. 216 void Arguments::init_system_properties() { 217 218 // Set up _system_boot_class_path which is not a property but 219 // relies heavily on argument processing and the jdk.boot.class.path.append 220 // property. It is used to store the underlying system boot class path. 221 _system_boot_class_path = new PathString(NULL); 222 223 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 224 "Java Virtual Machine Specification", false)); 225 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 226 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 227 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 228 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 229 230 // Following are JVMTI agent writable properties. 231 // Properties values are set to NULL and they are 232 // os specific they are initialized in os::init_system_properties_values(). 233 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 234 _java_library_path = new SystemProperty("java.library.path", NULL, true); 235 _java_home = new SystemProperty("java.home", NULL, true); 236 _java_class_path = new SystemProperty("java.class.path", "", true); 237 // jdk.boot.class.path.append is a non-writeable, internal property. 238 // It can only be set by either: 239 // - -Xbootclasspath/a: 240 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 241 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 242 243 // Add to System Property list. 244 PropertyList_add(&_system_properties, _sun_boot_library_path); 245 PropertyList_add(&_system_properties, _java_library_path); 246 PropertyList_add(&_system_properties, _java_home); 247 PropertyList_add(&_system_properties, _java_class_path); 248 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 249 250 // Set OS specific system properties values 251 os::init_system_properties_values(); 252 } 253 254 // Update/Initialize System properties after JDK version number is known 255 void Arguments::init_version_specific_system_properties() { 256 enum { bufsz = 16 }; 257 char buffer[bufsz]; 258 const char* spec_vendor = "Oracle Corporation"; 259 uint32_t spec_version = JDK_Version::current().major_version(); 260 261 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 262 263 PropertyList_add(&_system_properties, 264 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 265 PropertyList_add(&_system_properties, 266 new SystemProperty("java.vm.specification.version", buffer, false)); 267 PropertyList_add(&_system_properties, 268 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 269 } 270 271 /* 272 * -XX argument processing: 273 * 274 * -XX arguments are defined in several places, such as: 275 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 276 * -XX arguments are parsed in parse_argument(). 277 * -XX argument bounds checking is done in check_vm_args_consistency(). 278 * 279 * Over time -XX arguments may change. There are mechanisms to handle common cases: 280 * 281 * ALIASED: An option that is simply another name for another option. This is often 282 * part of the process of deprecating a flag, but not all aliases need 283 * to be deprecated. 284 * 285 * Create an alias for an option by adding the old and new option names to the 286 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 287 * 288 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 289 * support may be removed in the future. Both regular and aliased options may be 290 * deprecated. 291 * 292 * Add a deprecation warning for an option (or alias) by adding an entry in the 293 * "special_jvm_flags" table and setting the "deprecated_in" field. 294 * Often an option "deprecated" in one major release will 295 * be made "obsolete" in the next. In this case the entry should also have it's 296 * "obsolete_in" field set. 297 * 298 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 299 * on the command line. A warning is printed to let the user know that option might not 300 * be accepted in the future. 301 * 302 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 303 * table and setting the "obsolete_in" field. 304 * 305 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 306 * to the current JDK version. The system will flatly refuse to admit the existence of 307 * the flag. This allows a flag to die automatically over JDK releases. 308 * 309 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 310 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 311 * - Newly obsolete or expired deprecated options should have their global variable 312 * definitions removed (from globals.hpp, etc) and related implementations removed. 313 * 314 * Recommended approach for removing options: 315 * 316 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 317 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 318 * 319 * To remove internal options (e.g. diagnostic, experimental, develop options), use 320 * a 2-step model adding major release numbers to the obsolete and expire columns. 321 * 322 * To change the name of an option, use the alias table as well as a 2-step 323 * model adding major release numbers to the deprecate and expire columns. 324 * Think twice about aliasing commonly used customer options. 325 * 326 * There are times when it is appropriate to leave a future release number as undefined. 327 * 328 * Tests: Aliases should be tested in VMAliasOptions.java. 329 * Deprecated options should be tested in VMDeprecatedOptions.java. 330 */ 331 332 // Obsolete or deprecated -XX flag. 333 typedef struct { 334 const char* name; 335 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined"). 336 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined"). 337 JDK_Version expired_in; // When the option expires (or "undefined"). 338 } SpecialFlag; 339 340 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 341 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 342 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 343 // the command-line as usual, but will issue a warning. 344 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 345 // the command-line, while issuing a warning and ignoring the flag value. 346 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 347 // existence of the flag. 348 // 349 // MANUAL CLEANUP ON JDK VERSION UPDATES: 350 // This table ensures that the handling of options will update automatically when the JDK 351 // version is incremented, but the source code needs to be cleanup up manually: 352 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 353 // variable should be removed, as well as users of the variable. 354 // - As "deprecated" options age into "obsolete" options, move the entry into the 355 // "Obsolete Flags" section of the table. 356 // - All expired options should be removed from the table. 357 static SpecialFlag const special_jvm_flags[] = { 358 // -------------- Deprecated Flags -------------- 359 // --- Non-alias flags - sorted by obsolete_in then expired_in: 360 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 361 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 362 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 363 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 364 365 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 366 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 367 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 368 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 369 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 370 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 371 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 372 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 373 374 // -------------- Obsolete Flags - sorted by expired_in -------------- 375 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 376 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 377 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 378 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 379 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 380 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 381 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 382 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 383 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 384 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 385 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 386 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 387 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 388 #ifndef ZERO 389 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 390 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 391 #endif // ZERO 392 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 393 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 394 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 395 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 396 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 397 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 398 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 399 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 400 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 401 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 402 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 403 404 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 405 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 406 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 407 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 408 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 409 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 410 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 411 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 412 #endif 413 414 { NULL, JDK_Version(0), JDK_Version(0) } 415 }; 416 417 // Flags that are aliases for other flags. 418 typedef struct { 419 const char* alias_name; 420 const char* real_name; 421 } AliasedFlag; 422 423 static AliasedFlag const aliased_jvm_flags[] = { 424 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 425 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 426 { "CMSMarkStackSize", "MarkStackSize" }, 427 { "G1MarkStackSize", "MarkStackSize" }, 428 { "ParallelMarkingThreads", "ConcGCThreads" }, 429 { "ParallelCMSThreads", "ConcGCThreads" }, 430 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 431 { NULL, NULL} 432 }; 433 434 // NOTE: A compatibility request will be necessary for each alias to be removed. 435 static AliasedLoggingFlag const aliased_logging_flags[] = { 436 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 437 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 438 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 439 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 440 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 441 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 442 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 443 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 444 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 445 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 446 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 447 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 448 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 449 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 450 }; 451 452 #ifndef PRODUCT 453 // These options are removed in jdk9. Remove this code for jdk10. 454 static AliasedFlag const removed_develop_logging_flags[] = { 455 { "TraceClassInitialization", "-Xlog:class+init" }, 456 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 457 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 458 { "TraceItables", "-Xlog:itables=debug" }, 459 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 460 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 461 { "TraceStartupTime", "-Xlog:startuptime" }, 462 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 463 { "PrintVtables", "-Xlog:vtables=debug" }, 464 { "VerboseVerification", "-Xlog:verification" }, 465 { NULL, NULL } 466 }; 467 #endif //PRODUCT 468 469 // Return true if "v" is less than "other", where "other" may be "undefined". 470 static bool version_less_than(JDK_Version v, JDK_Version other) { 471 assert(!v.is_undefined(), "must be defined"); 472 if (!other.is_undefined() && v.compare(other) >= 0) { 473 return false; 474 } else { 475 return true; 476 } 477 } 478 479 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 480 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 481 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 482 flag = special_jvm_flags[i]; 483 return true; 484 } 485 } 486 return false; 487 } 488 489 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 490 assert(version != NULL, "Must provide a version buffer"); 491 SpecialFlag flag; 492 if (lookup_special_flag(flag_name, flag)) { 493 if (!flag.obsolete_in.is_undefined()) { 494 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 495 *version = flag.obsolete_in; 496 return true; 497 } 498 } 499 } 500 return false; 501 } 502 503 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 504 assert(version != NULL, "Must provide a version buffer"); 505 SpecialFlag flag; 506 if (lookup_special_flag(flag_name, flag)) { 507 if (!flag.deprecated_in.is_undefined()) { 508 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 509 version_less_than(JDK_Version::current(), flag.expired_in)) { 510 *version = flag.deprecated_in; 511 return 1; 512 } else { 513 return -1; 514 } 515 } 516 } 517 return 0; 518 } 519 520 #ifndef PRODUCT 521 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 522 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 523 const AliasedFlag& flag = removed_develop_logging_flags[i]; 524 if (strcmp(flag.alias_name, name) == 0) { 525 return flag.real_name; 526 } 527 } 528 return NULL; 529 } 530 #endif // PRODUCT 531 532 const char* Arguments::real_flag_name(const char *flag_name) { 533 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 534 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 535 if (strcmp(flag_status.alias_name, flag_name) == 0) { 536 return flag_status.real_name; 537 } 538 } 539 return flag_name; 540 } 541 542 #ifdef ASSERT 543 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 544 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 545 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 546 return true; 547 } 548 } 549 return false; 550 } 551 552 static bool verify_special_jvm_flags() { 553 bool success = true; 554 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 555 const SpecialFlag& flag = special_jvm_flags[i]; 556 if (lookup_special_flag(flag.name, i)) { 557 warning("Duplicate special flag declaration \"%s\"", flag.name); 558 success = false; 559 } 560 if (flag.deprecated_in.is_undefined() && 561 flag.obsolete_in.is_undefined()) { 562 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 563 success = false; 564 } 565 566 if (!flag.deprecated_in.is_undefined()) { 567 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 568 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 569 success = false; 570 } 571 572 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 573 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 574 success = false; 575 } 576 } 577 578 if (!flag.obsolete_in.is_undefined()) { 579 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 580 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 581 success = false; 582 } 583 584 // if flag has become obsolete it should not have a "globals" flag defined anymore. 585 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 586 if (Flag::find_flag(flag.name) != NULL) { 587 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 588 success = false; 589 } 590 } 591 } 592 593 if (!flag.expired_in.is_undefined()) { 594 // if flag has become expired it should not have a "globals" flag defined anymore. 595 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 596 if (Flag::find_flag(flag.name) != NULL) { 597 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 598 success = false; 599 } 600 } 601 } 602 603 } 604 return success; 605 } 606 #endif 607 608 // Parses a size specification string. 609 bool Arguments::atojulong(const char *s, julong* result) { 610 julong n = 0; 611 612 // First char must be a digit. Don't allow negative numbers or leading spaces. 613 if (!isdigit(*s)) { 614 return false; 615 } 616 617 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 618 char* remainder; 619 errno = 0; 620 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 621 if (errno != 0) { 622 return false; 623 } 624 625 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 626 if (remainder == s || strlen(remainder) > 1) { 627 return false; 628 } 629 630 switch (*remainder) { 631 case 'T': case 't': 632 *result = n * G * K; 633 // Check for overflow. 634 if (*result/((julong)G * K) != n) return false; 635 return true; 636 case 'G': case 'g': 637 *result = n * G; 638 if (*result/G != n) return false; 639 return true; 640 case 'M': case 'm': 641 *result = n * M; 642 if (*result/M != n) return false; 643 return true; 644 case 'K': case 'k': 645 *result = n * K; 646 if (*result/K != n) return false; 647 return true; 648 case '\0': 649 *result = n; 650 return true; 651 default: 652 return false; 653 } 654 } 655 656 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 657 if (size < min_size) return arg_too_small; 658 // Check that size will fit in a size_t (only relevant on 32-bit) 659 if (size > max_uintx) return arg_too_big; 660 return arg_in_range; 661 } 662 663 // Describe an argument out of range error 664 void Arguments::describe_range_error(ArgsRange errcode) { 665 switch(errcode) { 666 case arg_too_big: 667 jio_fprintf(defaultStream::error_stream(), 668 "The specified size exceeds the maximum " 669 "representable size.\n"); 670 break; 671 case arg_too_small: 672 case arg_unreadable: 673 case arg_in_range: 674 // do nothing for now 675 break; 676 default: 677 ShouldNotReachHere(); 678 } 679 } 680 681 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 682 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 683 return true; 684 } else { 685 return false; 686 } 687 } 688 689 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 690 char* end; 691 errno = 0; 692 double v = strtod(value, &end); 693 if ((errno != 0) || (*end != 0)) { 694 return false; 695 } 696 697 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 698 return true; 699 } 700 return false; 701 } 702 703 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 704 julong v; 705 int int_v; 706 intx intx_v; 707 bool is_neg = false; 708 Flag* result = Flag::find_flag(name, strlen(name)); 709 710 if (result == NULL) { 711 return false; 712 } 713 714 // Check the sign first since atojulong() parses only unsigned values. 715 if (*value == '-') { 716 if (!result->is_intx() && !result->is_int()) { 717 return false; 718 } 719 value++; 720 is_neg = true; 721 } 722 if (!Arguments::atojulong(value, &v)) { 723 return false; 724 } 725 if (result->is_int()) { 726 int_v = (int) v; 727 if (is_neg) { 728 int_v = -int_v; 729 } 730 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 731 } else if (result->is_uint()) { 732 uint uint_v = (uint) v; 733 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 734 } else if (result->is_intx()) { 735 intx_v = (intx) v; 736 if (is_neg) { 737 intx_v = -intx_v; 738 } 739 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 740 } else if (result->is_uintx()) { 741 uintx uintx_v = (uintx) v; 742 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 743 } else if (result->is_uint64_t()) { 744 uint64_t uint64_t_v = (uint64_t) v; 745 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 746 } else if (result->is_size_t()) { 747 size_t size_t_v = (size_t) v; 748 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 749 } else { 750 return false; 751 } 752 } 753 754 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 755 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 756 // Contract: CommandLineFlags always returns a pointer that needs freeing. 757 FREE_C_HEAP_ARRAY(char, value); 758 return true; 759 } 760 761 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 762 const char* old_value = ""; 763 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 764 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 765 size_t new_len = strlen(new_value); 766 const char* value; 767 char* free_this_too = NULL; 768 if (old_len == 0) { 769 value = new_value; 770 } else if (new_len == 0) { 771 value = old_value; 772 } else { 773 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments); 774 // each new setting adds another LINE to the switch: 775 sprintf(buf, "%s\n%s", old_value, new_value); 776 value = buf; 777 free_this_too = buf; 778 } 779 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 780 // CommandLineFlags always returns a pointer that needs freeing. 781 FREE_C_HEAP_ARRAY(char, value); 782 if (free_this_too != NULL) { 783 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 784 FREE_C_HEAP_ARRAY(char, free_this_too); 785 } 786 return true; 787 } 788 789 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 790 const char* real_name = real_flag_name(arg); 791 JDK_Version since = JDK_Version(); 792 switch (is_deprecated_flag(arg, &since)) { 793 case -1: 794 return NULL; // obsolete or expired, don't process normally 795 case 0: 796 return real_name; 797 case 1: { 798 if (warn) { 799 char version[256]; 800 since.to_string(version, sizeof(version)); 801 if (real_name != arg) { 802 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 803 arg, version, real_name); 804 } else { 805 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 806 arg, version); 807 } 808 } 809 return real_name; 810 } 811 } 812 ShouldNotReachHere(); 813 return NULL; 814 } 815 816 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 817 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 818 // Set tagset string buffer at max size of 256, large enough for any alias tagset 819 const int max_tagset_size = 256; 820 int max_tagset_len = max_tagset_size - 1; 821 char tagset_buffer[max_tagset_size]; 822 tagset_buffer[0] = '\0'; 823 824 // Write tag-set for aliased logging option, in string list form 825 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 826 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 827 if (i > 0) { 828 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 829 } 830 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 831 } 832 if (!alf.exactMatch) { 833 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 834 } 835 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 836 (on) ? "+" : "-", 837 name, 838 tagset_buffer, 839 (on) ? LogLevel::name(alf.level) : "off"); 840 } 841 842 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 843 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 844 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 845 if (strcmp(alf.alias_name, name) == 0) { 846 log_deprecated_flag(name, on, alf); 847 return alf; 848 } 849 } 850 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 851 return a; 852 } 853 854 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 855 856 // range of acceptable characters spelled out for portability reasons 857 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 858 #define BUFLEN 255 859 char name[BUFLEN+1]; 860 char dummy; 861 const char* real_name; 862 bool warn_if_deprecated = true; 863 864 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 865 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 866 if (alf.alias_name != NULL){ 867 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 868 return true; 869 } 870 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 871 if (real_name == NULL) { 872 return false; 873 } 874 return set_bool_flag(real_name, false, origin); 875 } 876 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 877 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 878 if (alf.alias_name != NULL){ 879 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 880 return true; 881 } 882 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 883 if (real_name == NULL) { 884 return false; 885 } 886 return set_bool_flag(real_name, true, origin); 887 } 888 889 char punct; 890 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 891 const char* value = strchr(arg, '=') + 1; 892 Flag* flag; 893 894 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 895 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 896 if (alf.alias_name != NULL) { 897 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 898 return true; 899 } 900 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 901 if (real_name == NULL) { 902 return false; 903 } 904 flag = Flag::find_flag(real_name); 905 if (flag != NULL && flag->is_ccstr()) { 906 if (flag->ccstr_accumulates()) { 907 return append_to_string_flag(real_name, value, origin); 908 } else { 909 if (value[0] == '\0') { 910 value = NULL; 911 } 912 return set_string_flag(real_name, value, origin); 913 } 914 } else { 915 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 916 } 917 } 918 919 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 920 const char* value = strchr(arg, '=') + 1; 921 // -XX:Foo:=xxx will reset the string flag to the given value. 922 if (value[0] == '\0') { 923 value = NULL; 924 } 925 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 926 if (real_name == NULL) { 927 return false; 928 } 929 return set_string_flag(real_name, value, origin); 930 } 931 932 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 933 #define SIGNED_NUMBER_RANGE "[-0123456789]" 934 #define NUMBER_RANGE "[0123456789eE+-]" 935 char value[BUFLEN + 1]; 936 char value2[BUFLEN + 1]; 937 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 938 // Looks like a floating-point number -- try again with more lenient format string 939 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 940 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 941 if (real_name == NULL) { 942 return false; 943 } 944 return set_fp_numeric_flag(real_name, value, origin); 945 } 946 } 947 948 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 949 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 950 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 951 if (real_name == NULL) { 952 return false; 953 } 954 return set_numeric_flag(real_name, value, origin); 955 } 956 957 return false; 958 } 959 960 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 961 assert(bldarray != NULL, "illegal argument"); 962 963 if (arg == NULL) { 964 return; 965 } 966 967 int new_count = *count + 1; 968 969 // expand the array and add arg to the last element 970 if (*bldarray == NULL) { 971 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 972 } else { 973 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 974 } 975 (*bldarray)[*count] = os::strdup_check_oom(arg); 976 *count = new_count; 977 } 978 979 void Arguments::build_jvm_args(const char* arg) { 980 add_string(&_jvm_args_array, &_num_jvm_args, arg); 981 } 982 983 void Arguments::build_jvm_flags(const char* arg) { 984 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 985 } 986 987 // utility function to return a string that concatenates all 988 // strings in a given char** array 989 const char* Arguments::build_resource_string(char** args, int count) { 990 if (args == NULL || count == 0) { 991 return NULL; 992 } 993 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 994 for (int i = 1; i < count; i++) { 995 length += strlen(args[i]) + 1; // add 1 for a space 996 } 997 char* s = NEW_RESOURCE_ARRAY(char, length); 998 strcpy(s, args[0]); 999 for (int j = 1; j < count; j++) { 1000 strcat(s, " "); 1001 strcat(s, args[j]); 1002 } 1003 return (const char*) s; 1004 } 1005 1006 void Arguments::print_on(outputStream* st) { 1007 st->print_cr("VM Arguments:"); 1008 if (num_jvm_flags() > 0) { 1009 st->print("jvm_flags: "); print_jvm_flags_on(st); 1010 st->cr(); 1011 } 1012 if (num_jvm_args() > 0) { 1013 st->print("jvm_args: "); print_jvm_args_on(st); 1014 st->cr(); 1015 } 1016 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1017 if (_java_class_path != NULL) { 1018 char* path = _java_class_path->value(); 1019 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1020 } 1021 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1022 } 1023 1024 void Arguments::print_summary_on(outputStream* st) { 1025 // Print the command line. Environment variables that are helpful for 1026 // reproducing the problem are written later in the hs_err file. 1027 // flags are from setting file 1028 if (num_jvm_flags() > 0) { 1029 st->print_raw("Settings File: "); 1030 print_jvm_flags_on(st); 1031 st->cr(); 1032 } 1033 // args are the command line and environment variable arguments. 1034 st->print_raw("Command Line: "); 1035 if (num_jvm_args() > 0) { 1036 print_jvm_args_on(st); 1037 } 1038 // this is the classfile and any arguments to the java program 1039 if (java_command() != NULL) { 1040 st->print("%s", java_command()); 1041 } 1042 st->cr(); 1043 } 1044 1045 void Arguments::print_jvm_flags_on(outputStream* st) { 1046 if (_num_jvm_flags > 0) { 1047 for (int i=0; i < _num_jvm_flags; i++) { 1048 st->print("%s ", _jvm_flags_array[i]); 1049 } 1050 } 1051 } 1052 1053 void Arguments::print_jvm_args_on(outputStream* st) { 1054 if (_num_jvm_args > 0) { 1055 for (int i=0; i < _num_jvm_args; i++) { 1056 st->print("%s ", _jvm_args_array[i]); 1057 } 1058 } 1059 } 1060 1061 bool Arguments::process_argument(const char* arg, 1062 jboolean ignore_unrecognized, 1063 Flag::Flags origin) { 1064 JDK_Version since = JDK_Version(); 1065 1066 if (parse_argument(arg, origin)) { 1067 return true; 1068 } 1069 1070 // Determine if the flag has '+', '-', or '=' characters. 1071 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1072 const char* const argname = has_plus_minus ? arg + 1 : arg; 1073 1074 size_t arg_len; 1075 const char* equal_sign = strchr(argname, '='); 1076 if (equal_sign == NULL) { 1077 arg_len = strlen(argname); 1078 } else { 1079 arg_len = equal_sign - argname; 1080 } 1081 1082 // Only make the obsolete check for valid arguments. 1083 if (arg_len <= BUFLEN) { 1084 // Construct a string which consists only of the argument name without '+', '-', or '='. 1085 char stripped_argname[BUFLEN+1]; 1086 strncpy(stripped_argname, argname, arg_len); 1087 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate. 1088 if (is_obsolete_flag(stripped_argname, &since)) { 1089 char version[256]; 1090 since.to_string(version, sizeof(version)); 1091 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1092 return true; 1093 } 1094 #ifndef PRODUCT 1095 else { 1096 const char* replacement; 1097 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1098 log_warning(arguments)("%s has been removed. Please use %s instead.", 1099 stripped_argname, 1100 replacement); 1101 return false; 1102 } 1103 } 1104 #endif //PRODUCT 1105 } 1106 1107 // For locked flags, report a custom error message if available. 1108 // Otherwise, report the standard unrecognized VM option. 1109 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1110 if (found_flag != NULL) { 1111 char locked_message_buf[BUFLEN]; 1112 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1113 if (strlen(locked_message_buf) == 0) { 1114 if (found_flag->is_bool() && !has_plus_minus) { 1115 jio_fprintf(defaultStream::error_stream(), 1116 "Missing +/- setting for VM option '%s'\n", argname); 1117 } else if (!found_flag->is_bool() && has_plus_minus) { 1118 jio_fprintf(defaultStream::error_stream(), 1119 "Unexpected +/- setting in VM option '%s'\n", argname); 1120 } else { 1121 jio_fprintf(defaultStream::error_stream(), 1122 "Improperly specified VM option '%s'\n", argname); 1123 } 1124 } else { 1125 #ifdef PRODUCT 1126 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1127 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1128 if (ignore_unrecognized && mismatched) { 1129 return true; 1130 } 1131 #endif 1132 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1133 } 1134 } else { 1135 if (ignore_unrecognized) { 1136 return true; 1137 } 1138 jio_fprintf(defaultStream::error_stream(), 1139 "Unrecognized VM option '%s'\n", argname); 1140 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1141 if (fuzzy_matched != NULL) { 1142 jio_fprintf(defaultStream::error_stream(), 1143 "Did you mean '%s%s%s'? ", 1144 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1145 fuzzy_matched->_name, 1146 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1147 } 1148 } 1149 1150 // allow for commandline "commenting out" options like -XX:#+Verbose 1151 return arg[0] == '#'; 1152 } 1153 1154 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1155 FILE* stream = fopen(file_name, "rb"); 1156 if (stream == NULL) { 1157 if (should_exist) { 1158 jio_fprintf(defaultStream::error_stream(), 1159 "Could not open settings file %s\n", file_name); 1160 return false; 1161 } else { 1162 return true; 1163 } 1164 } 1165 1166 char token[1024]; 1167 int pos = 0; 1168 1169 bool in_white_space = true; 1170 bool in_comment = false; 1171 bool in_quote = false; 1172 char quote_c = 0; 1173 bool result = true; 1174 1175 int c = getc(stream); 1176 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1177 if (in_white_space) { 1178 if (in_comment) { 1179 if (c == '\n') in_comment = false; 1180 } else { 1181 if (c == '#') in_comment = true; 1182 else if (!isspace(c)) { 1183 in_white_space = false; 1184 token[pos++] = c; 1185 } 1186 } 1187 } else { 1188 if (c == '\n' || (!in_quote && isspace(c))) { 1189 // token ends at newline, or at unquoted whitespace 1190 // this allows a way to include spaces in string-valued options 1191 token[pos] = '\0'; 1192 logOption(token); 1193 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1194 build_jvm_flags(token); 1195 pos = 0; 1196 in_white_space = true; 1197 in_quote = false; 1198 } else if (!in_quote && (c == '\'' || c == '"')) { 1199 in_quote = true; 1200 quote_c = c; 1201 } else if (in_quote && (c == quote_c)) { 1202 in_quote = false; 1203 } else { 1204 token[pos++] = c; 1205 } 1206 } 1207 c = getc(stream); 1208 } 1209 if (pos > 0) { 1210 token[pos] = '\0'; 1211 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1212 build_jvm_flags(token); 1213 } 1214 fclose(stream); 1215 return result; 1216 } 1217 1218 //============================================================================================================= 1219 // Parsing of properties (-D) 1220 1221 const char* Arguments::get_property(const char* key) { 1222 return PropertyList_get_value(system_properties(), key); 1223 } 1224 1225 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1226 const char* eq = strchr(prop, '='); 1227 const char* key; 1228 const char* value = ""; 1229 1230 if (eq == NULL) { 1231 // property doesn't have a value, thus use passed string 1232 key = prop; 1233 } else { 1234 // property have a value, thus extract it and save to the 1235 // allocated string 1236 size_t key_len = eq - prop; 1237 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1238 1239 strncpy(tmp_key, prop, key_len); 1240 tmp_key[key_len] = '\0'; 1241 key = tmp_key; 1242 1243 value = &prop[key_len + 1]; 1244 } 1245 1246 if (strcmp(key, "java.compiler") == 0) { 1247 process_java_compiler_argument(value); 1248 // Record value in Arguments, but let it get passed to Java. 1249 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1250 strcmp(key, "sun.java.launcher.pid") == 0) { 1251 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1252 // private and are processed in process_sun_java_launcher_properties(); 1253 // the sun.java.launcher property is passed on to the java application 1254 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1255 // append is true, writable is true, internal is false 1256 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1257 WriteableProperty, ExternalProperty); 1258 } else { 1259 if (strcmp(key, "sun.java.command") == 0) { 1260 char *old_java_command = _java_command; 1261 _java_command = os::strdup_check_oom(value, mtArguments); 1262 if (old_java_command != NULL) { 1263 os::free(old_java_command); 1264 } 1265 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1266 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1267 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1268 // its value without going through the property list or making a Java call. 1269 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1270 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1271 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1272 os::free((void *)old_java_vendor_url_bug); 1273 } 1274 } 1275 1276 // Create new property and add at the end of the list 1277 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1278 } 1279 1280 if (key != prop) { 1281 // SystemProperty copy passed value, thus free previously allocated 1282 // memory 1283 FreeHeap((void *)key); 1284 } 1285 1286 return true; 1287 } 1288 1289 // sets or adds a module name to the jdk.module.addmods property 1290 bool Arguments::append_to_addmods_property(const char* module_name) { 1291 const char* key = "jdk.module.addmods"; 1292 const char* old_value = Arguments::get_property(key); 1293 size_t buf_len = strlen(key) + strlen(module_name) + 2; 1294 if (old_value != NULL) { 1295 buf_len += strlen(old_value) + 1; 1296 } 1297 char* new_value = AllocateHeap(buf_len, mtArguments); 1298 if (new_value == NULL) { 1299 return false; 1300 } 1301 if (old_value == NULL) { 1302 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name); 1303 } else { 1304 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name); 1305 } 1306 bool added = add_property(new_value, UnwriteableProperty, InternalProperty); 1307 FreeHeap(new_value); 1308 return added; 1309 } 1310 1311 #if INCLUDE_CDS 1312 void Arguments::check_unsupported_dumping_properties() { 1313 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1314 const char* unsupported_properties[5] = { "jdk.module.main", 1315 "jdk.module.path", 1316 "jdk.module.upgrade.path", 1317 "jdk.module.addmods", 1318 "jdk.module.limitmods" }; 1319 const char* unsupported_options[5] = { "-m", 1320 "--module-path", 1321 "--upgrade-module-path", 1322 "--add-modules", 1323 "--limit-modules" }; 1324 SystemProperty* sp = system_properties(); 1325 while (sp != NULL) { 1326 for (int i = 0; i < 5; i++) { 1327 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1328 vm_exit_during_initialization( 1329 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1330 } 1331 } 1332 sp = sp->next(); 1333 } 1334 } 1335 #endif 1336 1337 //=========================================================================================================== 1338 // Setting int/mixed/comp mode flags 1339 1340 void Arguments::set_mode_flags(Mode mode) { 1341 // Set up default values for all flags. 1342 // If you add a flag to any of the branches below, 1343 // add a default value for it here. 1344 set_java_compiler(false); 1345 _mode = mode; 1346 1347 // Ensure Agent_OnLoad has the correct initial values. 1348 // This may not be the final mode; mode may change later in onload phase. 1349 PropertyList_unique_add(&_system_properties, "java.vm.info", 1350 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1351 1352 UseInterpreter = true; 1353 UseCompiler = true; 1354 UseLoopCounter = true; 1355 1356 // Default values may be platform/compiler dependent - 1357 // use the saved values 1358 ClipInlining = Arguments::_ClipInlining; 1359 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1360 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1361 BackgroundCompilation = Arguments::_BackgroundCompilation; 1362 if (TieredCompilation) { 1363 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1364 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1365 } 1366 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1367 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1368 } 1369 } 1370 1371 // Change from defaults based on mode 1372 switch (mode) { 1373 default: 1374 ShouldNotReachHere(); 1375 break; 1376 case _int: 1377 UseCompiler = false; 1378 UseLoopCounter = false; 1379 AlwaysCompileLoopMethods = false; 1380 UseOnStackReplacement = false; 1381 break; 1382 case _mixed: 1383 // same as default 1384 break; 1385 case _comp: 1386 UseInterpreter = false; 1387 BackgroundCompilation = false; 1388 ClipInlining = false; 1389 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1390 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1391 // compile a level 4 (C2) and then continue executing it. 1392 if (TieredCompilation) { 1393 Tier3InvokeNotifyFreqLog = 0; 1394 Tier4InvocationThreshold = 0; 1395 } 1396 break; 1397 } 1398 } 1399 1400 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS 1401 // Conflict: required to use shared spaces (-Xshare:on), but 1402 // incompatible command line options were chosen. 1403 1404 static void no_shared_spaces(const char* message) { 1405 if (RequireSharedSpaces) { 1406 jio_fprintf(defaultStream::error_stream(), 1407 "Class data sharing is inconsistent with other specified options.\n"); 1408 vm_exit_during_initialization("Unable to use shared archive.", message); 1409 } else { 1410 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1411 } 1412 } 1413 #endif 1414 1415 // Returns threshold scaled with the value of scale. 1416 // If scale < 0.0, threshold is returned without scaling. 1417 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1418 if (scale == 1.0 || scale < 0.0) { 1419 return threshold; 1420 } else { 1421 return (intx)(threshold * scale); 1422 } 1423 } 1424 1425 // Returns freq_log scaled with the value of scale. 1426 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1427 // If scale < 0.0, freq_log is returned without scaling. 1428 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1429 // Check if scaling is necessary or if negative value was specified. 1430 if (scale == 1.0 || scale < 0.0) { 1431 return freq_log; 1432 } 1433 // Check values to avoid calculating log2 of 0. 1434 if (scale == 0.0 || freq_log == 0) { 1435 return 0; 1436 } 1437 // Determine the maximum notification frequency value currently supported. 1438 // The largest mask value that the interpreter/C1 can handle is 1439 // of length InvocationCounter::number_of_count_bits. Mask values are always 1440 // one bit shorter then the value of the notification frequency. Set 1441 // max_freq_bits accordingly. 1442 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1443 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1444 if (scaled_freq == 0) { 1445 // Return 0 right away to avoid calculating log2 of 0. 1446 return 0; 1447 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1448 return max_freq_bits; 1449 } else { 1450 return log2_intptr(scaled_freq); 1451 } 1452 } 1453 1454 void Arguments::set_tiered_flags() { 1455 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1456 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1457 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1458 } 1459 if (CompilationPolicyChoice < 2) { 1460 vm_exit_during_initialization( 1461 "Incompatible compilation policy selected", NULL); 1462 } 1463 // Increase the code cache size - tiered compiles a lot more. 1464 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1465 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1466 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1467 } 1468 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1469 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1470 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1471 } 1472 if (!UseInterpreter) { // -Xcomp 1473 Tier3InvokeNotifyFreqLog = 0; 1474 Tier4InvocationThreshold = 0; 1475 } 1476 1477 if (CompileThresholdScaling < 0) { 1478 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1479 } 1480 1481 // Scale tiered compilation thresholds. 1482 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1483 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1484 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1485 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1486 1487 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1488 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1489 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1490 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1491 1492 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1493 // once these thresholds become supported. 1494 1495 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1496 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1497 1498 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1499 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1500 1501 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1502 1503 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1504 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1505 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1506 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1507 } 1508 } 1509 1510 #if INCLUDE_ALL_GCS 1511 static void disable_adaptive_size_policy(const char* collector_name) { 1512 if (UseAdaptiveSizePolicy) { 1513 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1514 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1515 collector_name); 1516 } 1517 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1518 } 1519 } 1520 1521 void Arguments::set_parnew_gc_flags() { 1522 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1523 "control point invariant"); 1524 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1525 assert(UseParNewGC, "ParNew should always be used with CMS"); 1526 1527 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1528 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1529 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1530 } else if (ParallelGCThreads == 0) { 1531 jio_fprintf(defaultStream::error_stream(), 1532 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1533 vm_exit(1); 1534 } 1535 1536 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1537 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1538 // we set them to 1024 and 1024. 1539 // See CR 6362902. 1540 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1541 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1542 } 1543 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1544 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1545 } 1546 1547 // When using compressed oops, we use local overflow stacks, 1548 // rather than using a global overflow list chained through 1549 // the klass word of the object's pre-image. 1550 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1551 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1552 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1553 } 1554 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1555 } 1556 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1557 } 1558 1559 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1560 // sparc/solaris for certain applications, but would gain from 1561 // further optimization and tuning efforts, and would almost 1562 // certainly gain from analysis of platform and environment. 1563 void Arguments::set_cms_and_parnew_gc_flags() { 1564 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1565 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1566 assert(UseParNewGC, "ParNew should always be used with CMS"); 1567 1568 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1569 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1570 1571 set_parnew_gc_flags(); 1572 1573 size_t max_heap = align_size_down(MaxHeapSize, 1574 CardTableRS::ct_max_alignment_constraint()); 1575 1576 // Now make adjustments for CMS 1577 intx tenuring_default = (intx)6; 1578 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1579 1580 // Preferred young gen size for "short" pauses: 1581 // upper bound depends on # of threads and NewRatio. 1582 const size_t preferred_max_new_size_unaligned = 1583 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1584 size_t preferred_max_new_size = 1585 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1586 1587 // Unless explicitly requested otherwise, size young gen 1588 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1589 1590 // If either MaxNewSize or NewRatio is set on the command line, 1591 // assume the user is trying to set the size of the young gen. 1592 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1593 1594 // Set MaxNewSize to our calculated preferred_max_new_size unless 1595 // NewSize was set on the command line and it is larger than 1596 // preferred_max_new_size. 1597 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1598 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1599 } else { 1600 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1601 } 1602 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1603 1604 // Code along this path potentially sets NewSize and OldSize 1605 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1606 min_heap_size(), InitialHeapSize, max_heap); 1607 size_t min_new = preferred_max_new_size; 1608 if (FLAG_IS_CMDLINE(NewSize)) { 1609 min_new = NewSize; 1610 } 1611 if (max_heap > min_new && min_heap_size() > min_new) { 1612 // Unless explicitly requested otherwise, make young gen 1613 // at least min_new, and at most preferred_max_new_size. 1614 if (FLAG_IS_DEFAULT(NewSize)) { 1615 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1616 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1617 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1618 } 1619 // Unless explicitly requested otherwise, size old gen 1620 // so it's NewRatio x of NewSize. 1621 if (FLAG_IS_DEFAULT(OldSize)) { 1622 if (max_heap > NewSize) { 1623 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1624 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1625 } 1626 } 1627 } 1628 } 1629 // Unless explicitly requested otherwise, definitely 1630 // promote all objects surviving "tenuring_default" scavenges. 1631 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1632 FLAG_IS_DEFAULT(SurvivorRatio)) { 1633 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1634 } 1635 // If we decided above (or user explicitly requested) 1636 // `promote all' (via MaxTenuringThreshold := 0), 1637 // prefer minuscule survivor spaces so as not to waste 1638 // space for (non-existent) survivors 1639 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1640 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1641 } 1642 1643 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1644 // but rather the number of free blocks of a given size that are used when 1645 // replenishing the local per-worker free list caches. 1646 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1647 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1648 // OldPLAB sizing manually turned off: Use a larger default setting, 1649 // unless it was manually specified. This is because a too-low value 1650 // will slow down scavenges. 1651 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1652 } else { 1653 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1654 } 1655 } 1656 1657 // If either of the static initialization defaults have changed, note this 1658 // modification. 1659 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1660 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1661 } 1662 1663 if (!ClassUnloading) { 1664 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1665 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1666 } 1667 1668 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1669 } 1670 #endif // INCLUDE_ALL_GCS 1671 1672 void set_object_alignment() { 1673 // Object alignment. 1674 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1675 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1676 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1677 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1678 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1679 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1680 1681 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1682 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1683 1684 // Oop encoding heap max 1685 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1686 1687 if (SurvivorAlignmentInBytes == 0) { 1688 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1689 } 1690 1691 #if INCLUDE_ALL_GCS 1692 // Set CMS global values 1693 CompactibleFreeListSpace::set_cms_values(); 1694 #endif // INCLUDE_ALL_GCS 1695 } 1696 1697 size_t Arguments::max_heap_for_compressed_oops() { 1698 // Avoid sign flip. 1699 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1700 // We need to fit both the NULL page and the heap into the memory budget, while 1701 // keeping alignment constraints of the heap. To guarantee the latter, as the 1702 // NULL page is located before the heap, we pad the NULL page to the conservative 1703 // maximum alignment that the GC may ever impose upon the heap. 1704 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1705 _conservative_max_heap_alignment); 1706 1707 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1708 NOT_LP64(ShouldNotReachHere(); return 0); 1709 } 1710 1711 bool Arguments::should_auto_select_low_pause_collector() { 1712 if (UseAutoGCSelectPolicy && 1713 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1714 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1715 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1716 return true; 1717 } 1718 return false; 1719 } 1720 1721 void Arguments::set_use_compressed_oops() { 1722 #ifndef ZERO 1723 #ifdef _LP64 1724 // MaxHeapSize is not set up properly at this point, but 1725 // the only value that can override MaxHeapSize if we are 1726 // to use UseCompressedOops is InitialHeapSize. 1727 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1728 1729 if (max_heap_size <= max_heap_for_compressed_oops()) { 1730 #if !defined(COMPILER1) || defined(TIERED) 1731 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1732 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1733 } 1734 #endif 1735 } else { 1736 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1737 warning("Max heap size too large for Compressed Oops"); 1738 FLAG_SET_DEFAULT(UseCompressedOops, false); 1739 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1740 } 1741 } 1742 #endif // _LP64 1743 #endif // ZERO 1744 } 1745 1746 1747 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1748 // set_use_compressed_oops(). 1749 void Arguments::set_use_compressed_klass_ptrs() { 1750 #ifndef ZERO 1751 #ifdef _LP64 1752 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1753 if (!UseCompressedOops) { 1754 if (UseCompressedClassPointers) { 1755 warning("UseCompressedClassPointers requires UseCompressedOops"); 1756 } 1757 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1758 } else { 1759 // Turn on UseCompressedClassPointers too 1760 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1761 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1762 } 1763 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1764 if (UseCompressedClassPointers) { 1765 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1766 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1767 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1768 } 1769 } 1770 } 1771 #endif // _LP64 1772 #endif // !ZERO 1773 } 1774 1775 void Arguments::set_conservative_max_heap_alignment() { 1776 // The conservative maximum required alignment for the heap is the maximum of 1777 // the alignments imposed by several sources: any requirements from the heap 1778 // itself, the collector policy and the maximum page size we may run the VM 1779 // with. 1780 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1781 #if INCLUDE_ALL_GCS 1782 if (UseParallelGC) { 1783 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1784 } else if (UseG1GC) { 1785 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1786 } 1787 #endif // INCLUDE_ALL_GCS 1788 _conservative_max_heap_alignment = MAX4(heap_alignment, 1789 (size_t)os::vm_allocation_granularity(), 1790 os::max_page_size(), 1791 CollectorPolicy::compute_heap_alignment()); 1792 } 1793 1794 bool Arguments::gc_selected() { 1795 #if INCLUDE_ALL_GCS 1796 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1797 #else 1798 return UseSerialGC; 1799 #endif // INCLUDE_ALL_GCS 1800 } 1801 1802 void Arguments::select_gc_ergonomically() { 1803 #if INCLUDE_ALL_GCS 1804 if (os::is_server_class_machine()) { 1805 if (should_auto_select_low_pause_collector()) { 1806 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true); 1807 } else { 1808 #if defined(JAVASE_EMBEDDED) 1809 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true); 1810 #else 1811 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1812 #endif 1813 } 1814 } else { 1815 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1816 } 1817 #else 1818 UNSUPPORTED_OPTION(UseG1GC); 1819 UNSUPPORTED_OPTION(UseParallelGC); 1820 UNSUPPORTED_OPTION(UseParallelOldGC); 1821 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1822 UNSUPPORTED_OPTION(UseParNewGC); 1823 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1824 #endif // INCLUDE_ALL_GCS 1825 } 1826 1827 void Arguments::select_gc() { 1828 if (!gc_selected()) { 1829 select_gc_ergonomically(); 1830 if (!gc_selected()) { 1831 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1832 } 1833 } 1834 } 1835 1836 void Arguments::set_ergonomics_flags() { 1837 select_gc(); 1838 1839 #if defined(COMPILER2) || INCLUDE_JVMCI 1840 // Shared spaces work fine with other GCs but causes bytecode rewriting 1841 // to be disabled, which hurts interpreter performance and decreases 1842 // server performance. When -server is specified, keep the default off 1843 // unless it is asked for. Future work: either add bytecode rewriting 1844 // at link time, or rewrite bytecodes in non-shared methods. 1845 if (!DumpSharedSpaces && !RequireSharedSpaces && 1846 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1847 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1848 } 1849 #endif 1850 1851 set_conservative_max_heap_alignment(); 1852 1853 #ifndef ZERO 1854 #ifdef _LP64 1855 set_use_compressed_oops(); 1856 1857 // set_use_compressed_klass_ptrs() must be called after calling 1858 // set_use_compressed_oops(). 1859 set_use_compressed_klass_ptrs(); 1860 1861 // Also checks that certain machines are slower with compressed oops 1862 // in vm_version initialization code. 1863 #endif // _LP64 1864 #endif // !ZERO 1865 1866 CodeCacheExtensions::set_ergonomics_flags(); 1867 } 1868 1869 void Arguments::set_parallel_gc_flags() { 1870 assert(UseParallelGC || UseParallelOldGC, "Error"); 1871 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1872 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1873 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1874 } 1875 FLAG_SET_DEFAULT(UseParallelGC, true); 1876 1877 // If no heap maximum was requested explicitly, use some reasonable fraction 1878 // of the physical memory, up to a maximum of 1GB. 1879 FLAG_SET_DEFAULT(ParallelGCThreads, 1880 Abstract_VM_Version::parallel_worker_threads()); 1881 if (ParallelGCThreads == 0) { 1882 jio_fprintf(defaultStream::error_stream(), 1883 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1884 vm_exit(1); 1885 } 1886 1887 if (UseAdaptiveSizePolicy) { 1888 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1889 // unless the user actually sets these flags. 1890 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1891 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1892 } 1893 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1894 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1895 } 1896 } 1897 1898 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1899 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1900 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1901 // See CR 6362902 for details. 1902 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1903 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1904 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1905 } 1906 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1907 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1908 } 1909 } 1910 1911 if (UseParallelOldGC) { 1912 // Par compact uses lower default values since they are treated as 1913 // minimums. These are different defaults because of the different 1914 // interpretation and are not ergonomically set. 1915 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1916 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1917 } 1918 } 1919 } 1920 1921 void Arguments::set_g1_gc_flags() { 1922 assert(UseG1GC, "Error"); 1923 #if defined(COMPILER1) || INCLUDE_JVMCI 1924 FastTLABRefill = false; 1925 #endif 1926 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1927 if (ParallelGCThreads == 0) { 1928 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1929 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1930 } 1931 1932 #if INCLUDE_ALL_GCS 1933 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1934 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1935 } 1936 #endif 1937 1938 // MarkStackSize will be set (if it hasn't been set by the user) 1939 // when concurrent marking is initialized. 1940 // Its value will be based upon the number of parallel marking threads. 1941 // But we do set the maximum mark stack size here. 1942 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1943 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1944 } 1945 1946 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1947 // In G1, we want the default GC overhead goal to be higher than 1948 // it is for PS, or the heap might be expanded too aggressively. 1949 // We set it here to ~8%. 1950 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1951 } 1952 1953 // Below, we might need to calculate the pause time interval based on 1954 // the pause target. When we do so we are going to give G1 maximum 1955 // flexibility and allow it to do pauses when it needs to. So, we'll 1956 // arrange that the pause interval to be pause time target + 1 to 1957 // ensure that a) the pause time target is maximized with respect to 1958 // the pause interval and b) we maintain the invariant that pause 1959 // time target < pause interval. If the user does not want this 1960 // maximum flexibility, they will have to set the pause interval 1961 // explicitly. 1962 1963 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1964 // The default pause time target in G1 is 200ms 1965 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1966 } 1967 1968 // Then, if the interval parameter was not set, set it according to 1969 // the pause time target (this will also deal with the case when the 1970 // pause time target is the default value). 1971 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1972 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1973 } 1974 1975 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1976 } 1977 1978 void Arguments::set_gc_specific_flags() { 1979 #if INCLUDE_ALL_GCS 1980 // Set per-collector flags 1981 if (UseParallelGC || UseParallelOldGC) { 1982 set_parallel_gc_flags(); 1983 } else if (UseConcMarkSweepGC) { 1984 set_cms_and_parnew_gc_flags(); 1985 } else if (UseG1GC) { 1986 set_g1_gc_flags(); 1987 } 1988 if (AssumeMP && !UseSerialGC) { 1989 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1990 warning("If the number of processors is expected to increase from one, then" 1991 " you should configure the number of parallel GC threads appropriately" 1992 " using -XX:ParallelGCThreads=N"); 1993 } 1994 } 1995 if (MinHeapFreeRatio == 100) { 1996 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1997 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1998 } 1999 #endif // INCLUDE_ALL_GCS 2000 } 2001 2002 julong Arguments::limit_by_allocatable_memory(julong limit) { 2003 julong max_allocatable; 2004 julong result = limit; 2005 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2006 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2007 } 2008 return result; 2009 } 2010 2011 // Use static initialization to get the default before parsing 2012 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2013 2014 void Arguments::set_heap_size() { 2015 const julong phys_mem = 2016 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2017 : (julong)MaxRAM; 2018 2019 // If the maximum heap size has not been set with -Xmx, 2020 // then set it as fraction of the size of physical memory, 2021 // respecting the maximum and minimum sizes of the heap. 2022 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2023 julong reasonable_max = phys_mem / MaxRAMFraction; 2024 2025 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2026 // Small physical memory, so use a minimum fraction of it for the heap 2027 reasonable_max = phys_mem / MinRAMFraction; 2028 } else { 2029 // Not-small physical memory, so require a heap at least 2030 // as large as MaxHeapSize 2031 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2032 } 2033 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2034 // Limit the heap size to ErgoHeapSizeLimit 2035 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2036 } 2037 if (UseCompressedOops) { 2038 // Limit the heap size to the maximum possible when using compressed oops 2039 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2040 2041 // HeapBaseMinAddress can be greater than default but not less than. 2042 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2043 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2044 // matches compressed oops printing flags 2045 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2046 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2047 DefaultHeapBaseMinAddress, 2048 DefaultHeapBaseMinAddress/G, 2049 HeapBaseMinAddress); 2050 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2051 } 2052 } 2053 2054 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2055 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2056 // but it should be not less than default MaxHeapSize. 2057 max_coop_heap -= HeapBaseMinAddress; 2058 } 2059 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2060 } 2061 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2062 2063 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2064 // An initial heap size was specified on the command line, 2065 // so be sure that the maximum size is consistent. Done 2066 // after call to limit_by_allocatable_memory because that 2067 // method might reduce the allocation size. 2068 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2069 } 2070 2071 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2072 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2073 } 2074 2075 // If the minimum or initial heap_size have not been set or requested to be set 2076 // ergonomically, set them accordingly. 2077 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2078 julong reasonable_minimum = (julong)(OldSize + NewSize); 2079 2080 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2081 2082 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2083 2084 if (InitialHeapSize == 0) { 2085 julong reasonable_initial = phys_mem / InitialRAMFraction; 2086 2087 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2088 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2089 2090 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2091 2092 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2093 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2094 } 2095 // If the minimum heap size has not been set (via -Xms), 2096 // synchronize with InitialHeapSize to avoid errors with the default value. 2097 if (min_heap_size() == 0) { 2098 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2099 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2100 } 2101 } 2102 } 2103 2104 // This option inspects the machine and attempts to set various 2105 // parameters to be optimal for long-running, memory allocation 2106 // intensive jobs. It is intended for machines with large 2107 // amounts of cpu and memory. 2108 jint Arguments::set_aggressive_heap_flags() { 2109 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2110 // VM, but we may not be able to represent the total physical memory 2111 // available (like having 8gb of memory on a box but using a 32bit VM). 2112 // Thus, we need to make sure we're using a julong for intermediate 2113 // calculations. 2114 julong initHeapSize; 2115 julong total_memory = os::physical_memory(); 2116 2117 if (total_memory < (julong) 256 * M) { 2118 jio_fprintf(defaultStream::error_stream(), 2119 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2120 vm_exit(1); 2121 } 2122 2123 // The heap size is half of available memory, or (at most) 2124 // all of possible memory less 160mb (leaving room for the OS 2125 // when using ISM). This is the maximum; because adaptive sizing 2126 // is turned on below, the actual space used may be smaller. 2127 2128 initHeapSize = MIN2(total_memory / (julong) 2, 2129 total_memory - (julong) 160 * M); 2130 2131 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2132 2133 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2134 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2135 return JNI_EINVAL; 2136 } 2137 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2138 return JNI_EINVAL; 2139 } 2140 // Currently the minimum size and the initial heap sizes are the same. 2141 set_min_heap_size(initHeapSize); 2142 } 2143 if (FLAG_IS_DEFAULT(NewSize)) { 2144 // Make the young generation 3/8ths of the total heap. 2145 if (FLAG_SET_CMDLINE(size_t, NewSize, 2146 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2147 return JNI_EINVAL; 2148 } 2149 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2150 return JNI_EINVAL; 2151 } 2152 } 2153 2154 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2155 FLAG_SET_DEFAULT(UseLargePages, true); 2156 #endif 2157 2158 // Increase some data structure sizes for efficiency 2159 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2160 return JNI_EINVAL; 2161 } 2162 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2163 return JNI_EINVAL; 2164 } 2165 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2166 return JNI_EINVAL; 2167 } 2168 2169 // See the OldPLABSize comment below, but replace 'after promotion' 2170 // with 'after copying'. YoungPLABSize is the size of the survivor 2171 // space per-gc-thread buffers. The default is 4kw. 2172 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2173 return JNI_EINVAL; 2174 } 2175 2176 // OldPLABSize is the size of the buffers in the old gen that 2177 // UseParallelGC uses to promote live data that doesn't fit in the 2178 // survivor spaces. At any given time, there's one for each gc thread. 2179 // The default size is 1kw. These buffers are rarely used, since the 2180 // survivor spaces are usually big enough. For specjbb, however, there 2181 // are occasions when there's lots of live data in the young gen 2182 // and we end up promoting some of it. We don't have a definite 2183 // explanation for why bumping OldPLABSize helps, but the theory 2184 // is that a bigger PLAB results in retaining something like the 2185 // original allocation order after promotion, which improves mutator 2186 // locality. A minor effect may be that larger PLABs reduce the 2187 // number of PLAB allocation events during gc. The value of 8kw 2188 // was arrived at by experimenting with specjbb. 2189 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2190 return JNI_EINVAL; 2191 } 2192 2193 // Enable parallel GC and adaptive generation sizing 2194 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2195 return JNI_EINVAL; 2196 } 2197 FLAG_SET_DEFAULT(ParallelGCThreads, 2198 Abstract_VM_Version::parallel_worker_threads()); 2199 2200 // Encourage steady state memory management 2201 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2202 return JNI_EINVAL; 2203 } 2204 2205 // This appears to improve mutator locality 2206 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2207 return JNI_EINVAL; 2208 } 2209 2210 // Get around early Solaris scheduling bug 2211 // (affinity vs other jobs on system) 2212 // but disallow DR and offlining (5008695). 2213 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2214 return JNI_EINVAL; 2215 } 2216 2217 return JNI_OK; 2218 } 2219 2220 // This must be called after ergonomics. 2221 void Arguments::set_bytecode_flags() { 2222 if (!RewriteBytecodes) { 2223 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2224 } 2225 } 2226 2227 // Aggressive optimization flags -XX:+AggressiveOpts 2228 jint Arguments::set_aggressive_opts_flags() { 2229 #ifdef COMPILER2 2230 if (AggressiveUnboxing) { 2231 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2232 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2233 } else if (!EliminateAutoBox) { 2234 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2235 AggressiveUnboxing = false; 2236 } 2237 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2238 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2239 } else if (!DoEscapeAnalysis) { 2240 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2241 AggressiveUnboxing = false; 2242 } 2243 } 2244 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2245 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2246 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2247 } 2248 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2249 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2250 } 2251 2252 // Feed the cache size setting into the JDK 2253 char buffer[1024]; 2254 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2255 if (!add_property(buffer)) { 2256 return JNI_ENOMEM; 2257 } 2258 } 2259 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2260 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2261 } 2262 #endif 2263 2264 if (AggressiveOpts) { 2265 // Sample flag setting code 2266 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2267 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2268 // } 2269 } 2270 2271 return JNI_OK; 2272 } 2273 2274 //=========================================================================================================== 2275 // Parsing of java.compiler property 2276 2277 void Arguments::process_java_compiler_argument(const char* arg) { 2278 // For backwards compatibility, Djava.compiler=NONE or "" 2279 // causes us to switch to -Xint mode UNLESS -Xdebug 2280 // is also specified. 2281 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2282 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2283 } 2284 } 2285 2286 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2287 _sun_java_launcher = os::strdup_check_oom(launcher); 2288 } 2289 2290 bool Arguments::created_by_java_launcher() { 2291 assert(_sun_java_launcher != NULL, "property must have value"); 2292 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2293 } 2294 2295 bool Arguments::sun_java_launcher_is_altjvm() { 2296 return _sun_java_launcher_is_altjvm; 2297 } 2298 2299 //=========================================================================================================== 2300 // Parsing of main arguments 2301 2302 #if INCLUDE_JVMCI 2303 // Check consistency of jvmci vm argument settings. 2304 bool Arguments::check_jvmci_args_consistency() { 2305 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) { 2306 JVMCIGlobals::print_jvmci_args_inconsistency_error_message(); 2307 return false; 2308 } 2309 return true; 2310 } 2311 #endif //INCLUDE_JVMCI 2312 2313 // Check consistency of GC selection 2314 bool Arguments::check_gc_consistency() { 2315 // Ensure that the user has not selected conflicting sets 2316 // of collectors. 2317 uint i = 0; 2318 if (UseSerialGC) i++; 2319 if (UseConcMarkSweepGC) i++; 2320 if (UseParallelGC || UseParallelOldGC) i++; 2321 if (UseG1GC) i++; 2322 if (i > 1) { 2323 jio_fprintf(defaultStream::error_stream(), 2324 "Conflicting collector combinations in option list; " 2325 "please refer to the release notes for the combinations " 2326 "allowed\n"); 2327 return false; 2328 } 2329 2330 if (UseConcMarkSweepGC && !UseParNewGC) { 2331 jio_fprintf(defaultStream::error_stream(), 2332 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2333 return false; 2334 } 2335 2336 if (UseParNewGC && !UseConcMarkSweepGC) { 2337 jio_fprintf(defaultStream::error_stream(), 2338 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2339 return false; 2340 } 2341 2342 return true; 2343 } 2344 2345 // Check the consistency of vm_init_args 2346 bool Arguments::check_vm_args_consistency() { 2347 // Method for adding checks for flag consistency. 2348 // The intent is to warn the user of all possible conflicts, 2349 // before returning an error. 2350 // Note: Needs platform-dependent factoring. 2351 bool status = true; 2352 2353 if (TLABRefillWasteFraction == 0) { 2354 jio_fprintf(defaultStream::error_stream(), 2355 "TLABRefillWasteFraction should be a denominator, " 2356 "not " SIZE_FORMAT "\n", 2357 TLABRefillWasteFraction); 2358 status = false; 2359 } 2360 2361 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2362 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2363 } 2364 2365 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2366 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2367 } 2368 2369 if (GCTimeLimit == 100) { 2370 // Turn off gc-overhead-limit-exceeded checks 2371 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2372 } 2373 2374 status = status && check_gc_consistency(); 2375 2376 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2377 // insists that we hold the requisite locks so that the iteration is 2378 // MT-safe. For the verification at start-up and shut-down, we don't 2379 // yet have a good way of acquiring and releasing these locks, 2380 // which are not visible at the CollectedHeap level. We want to 2381 // be able to acquire these locks and then do the iteration rather 2382 // than just disable the lock verification. This will be fixed under 2383 // bug 4788986. 2384 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2385 if (VerifyDuringStartup) { 2386 warning("Heap verification at start-up disabled " 2387 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2388 VerifyDuringStartup = false; // Disable verification at start-up 2389 } 2390 2391 if (VerifyBeforeExit) { 2392 warning("Heap verification at shutdown disabled " 2393 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2394 VerifyBeforeExit = false; // Disable verification at shutdown 2395 } 2396 } 2397 2398 if (PrintNMTStatistics) { 2399 #if INCLUDE_NMT 2400 if (MemTracker::tracking_level() == NMT_off) { 2401 #endif // INCLUDE_NMT 2402 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2403 PrintNMTStatistics = false; 2404 #if INCLUDE_NMT 2405 } 2406 #endif 2407 } 2408 #if INCLUDE_JVMCI 2409 2410 status = status && check_jvmci_args_consistency(); 2411 2412 if (EnableJVMCI) { 2413 if (!ScavengeRootsInCode) { 2414 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2415 ScavengeRootsInCode = 1; 2416 } 2417 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2418 TypeProfileLevel = 0; 2419 } 2420 if (UseJVMCICompiler) { 2421 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2422 TypeProfileWidth = 8; 2423 } 2424 } 2425 } 2426 #endif 2427 2428 // Check lower bounds of the code cache 2429 // Template Interpreter code is approximately 3X larger in debug builds. 2430 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2431 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2432 jio_fprintf(defaultStream::error_stream(), 2433 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2434 os::vm_page_size()/K); 2435 status = false; 2436 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2437 jio_fprintf(defaultStream::error_stream(), 2438 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2439 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2440 status = false; 2441 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2442 jio_fprintf(defaultStream::error_stream(), 2443 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2444 min_code_cache_size/K); 2445 status = false; 2446 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2447 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2448 jio_fprintf(defaultStream::error_stream(), 2449 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2450 CODE_CACHE_SIZE_LIMIT/M); 2451 status = false; 2452 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2453 jio_fprintf(defaultStream::error_stream(), 2454 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2455 min_code_cache_size/K); 2456 status = false; 2457 } 2458 2459 #ifdef _LP64 2460 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2461 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2462 } 2463 #endif 2464 2465 #ifndef SUPPORT_RESERVED_STACK_AREA 2466 if (StackReservedPages != 0) { 2467 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2468 warning("Reserved Stack Area not supported on this platform"); 2469 } 2470 #endif 2471 2472 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2473 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2474 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2475 } 2476 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2477 } 2478 if (UseCompiler && is_interpreter_only()) { 2479 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2480 warning("UseCompiler disabled due to -Xint."); 2481 } 2482 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2483 } 2484 #ifdef COMPILER2 2485 if (PostLoopMultiversioning && !RangeCheckElimination) { 2486 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2487 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2488 } 2489 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2490 } 2491 #endif 2492 return status; 2493 } 2494 2495 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2496 const char* option_type) { 2497 if (ignore) return false; 2498 2499 const char* spacer = " "; 2500 if (option_type == NULL) { 2501 option_type = ++spacer; // Set both to the empty string. 2502 } 2503 2504 if (os::obsolete_option(option)) { 2505 jio_fprintf(defaultStream::error_stream(), 2506 "Obsolete %s%soption: %s\n", option_type, spacer, 2507 option->optionString); 2508 return false; 2509 } else { 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Unrecognized %s%soption: %s\n", option_type, spacer, 2512 option->optionString); 2513 return true; 2514 } 2515 } 2516 2517 static const char* user_assertion_options[] = { 2518 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2519 }; 2520 2521 static const char* system_assertion_options[] = { 2522 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2523 }; 2524 2525 bool Arguments::parse_uintx(const char* value, 2526 uintx* uintx_arg, 2527 uintx min_size) { 2528 2529 // Check the sign first since atojulong() parses only unsigned values. 2530 bool value_is_positive = !(*value == '-'); 2531 2532 if (value_is_positive) { 2533 julong n; 2534 bool good_return = atojulong(value, &n); 2535 if (good_return) { 2536 bool above_minimum = n >= min_size; 2537 bool value_is_too_large = n > max_uintx; 2538 2539 if (above_minimum && !value_is_too_large) { 2540 *uintx_arg = n; 2541 return true; 2542 } 2543 } 2544 } 2545 return false; 2546 } 2547 2548 unsigned int addreads_count = 0; 2549 unsigned int addexports_count = 0; 2550 unsigned int patch_mod_count = 0; 2551 const char* add_modules_value = NULL; 2552 2553 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2554 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2555 char* property = AllocateHeap(prop_len, mtArguments); 2556 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2557 if (ret < 0 || ret >= (int)prop_len) { 2558 FreeHeap(property); 2559 return false; 2560 } 2561 bool added = add_property(property, UnwriteableProperty, internal); 2562 FreeHeap(property); 2563 return added; 2564 } 2565 2566 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2567 // Make sure count is < 1,000. Otherwise, memory allocation will be too small. 2568 if (count < 1000) { 2569 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5; 2570 char* property = AllocateHeap(prop_len, mtArguments); 2571 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2572 if (ret < 0 || ret >= (int)prop_len) { 2573 FreeHeap(property); 2574 return false; 2575 } 2576 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2577 FreeHeap(property); 2578 return added; 2579 } 2580 return false; 2581 } 2582 2583 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2584 julong* long_arg, 2585 julong min_size) { 2586 if (!atojulong(s, long_arg)) return arg_unreadable; 2587 return check_memory_size(*long_arg, min_size); 2588 } 2589 2590 // Parse JavaVMInitArgs structure 2591 2592 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2593 const JavaVMInitArgs *java_options_args, 2594 const JavaVMInitArgs *cmd_line_args) { 2595 bool patch_mod_javabase = false; 2596 2597 // Save default settings for some mode flags 2598 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2599 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2600 Arguments::_ClipInlining = ClipInlining; 2601 Arguments::_BackgroundCompilation = BackgroundCompilation; 2602 if (TieredCompilation) { 2603 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2604 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2605 } 2606 2607 // Setup flags for mixed which is the default 2608 set_mode_flags(_mixed); 2609 2610 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2611 // variable (if present). 2612 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2613 if (result != JNI_OK) { 2614 return result; 2615 } 2616 2617 // Parse args structure generated from the command line flags. 2618 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2619 if (result != JNI_OK) { 2620 return result; 2621 } 2622 2623 // Parse args structure generated from the _JAVA_OPTIONS environment 2624 // variable (if present) (mimics classic VM) 2625 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2626 if (result != JNI_OK) { 2627 return result; 2628 } 2629 2630 // Do final processing now that all arguments have been parsed 2631 result = finalize_vm_init_args(); 2632 if (result != JNI_OK) { 2633 return result; 2634 } 2635 2636 return JNI_OK; 2637 } 2638 2639 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2640 // represents a valid JDWP agent. is_path==true denotes that we 2641 // are dealing with -agentpath (case where name is a path), otherwise with 2642 // -agentlib 2643 bool valid_jdwp_agent(char *name, bool is_path) { 2644 char *_name; 2645 const char *_jdwp = "jdwp"; 2646 size_t _len_jdwp, _len_prefix; 2647 2648 if (is_path) { 2649 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2650 return false; 2651 } 2652 2653 _name++; // skip past last path separator 2654 _len_prefix = strlen(JNI_LIB_PREFIX); 2655 2656 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2657 return false; 2658 } 2659 2660 _name += _len_prefix; 2661 _len_jdwp = strlen(_jdwp); 2662 2663 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2664 _name += _len_jdwp; 2665 } 2666 else { 2667 return false; 2668 } 2669 2670 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2671 return false; 2672 } 2673 2674 return true; 2675 } 2676 2677 if (strcmp(name, _jdwp) == 0) { 2678 return true; 2679 } 2680 2681 return false; 2682 } 2683 2684 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2685 // --patch-module=<module>=<file>(<pathsep><file>)* 2686 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2687 // Find the equal sign between the module name and the path specification 2688 const char* module_equal = strchr(patch_mod_tail, '='); 2689 if (module_equal == NULL) { 2690 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2691 return JNI_ERR; 2692 } else { 2693 // Pick out the module name 2694 size_t module_len = module_equal - patch_mod_tail; 2695 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2696 if (module_name != NULL) { 2697 memcpy(module_name, patch_mod_tail, module_len); 2698 *(module_name + module_len) = '\0'; 2699 // The path piece begins one past the module_equal sign 2700 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2701 FREE_C_HEAP_ARRAY(char, module_name); 2702 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2703 return JNI_ENOMEM; 2704 } 2705 } else { 2706 return JNI_ENOMEM; 2707 } 2708 } 2709 return JNI_OK; 2710 } 2711 2712 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2713 // For match_option to return remaining or value part of option string 2714 const char* tail; 2715 2716 // iterate over arguments 2717 for (int index = 0; index < args->nOptions; index++) { 2718 bool is_absolute_path = false; // for -agentpath vs -agentlib 2719 2720 const JavaVMOption* option = args->options + index; 2721 2722 if (!match_option(option, "-Djava.class.path", &tail) && 2723 !match_option(option, "-Dsun.java.command", &tail) && 2724 !match_option(option, "-Dsun.java.launcher", &tail)) { 2725 2726 // add all jvm options to the jvm_args string. This string 2727 // is used later to set the java.vm.args PerfData string constant. 2728 // the -Djava.class.path and the -Dsun.java.command options are 2729 // omitted from jvm_args string as each have their own PerfData 2730 // string constant object. 2731 build_jvm_args(option->optionString); 2732 } 2733 2734 // -verbose:[class/gc/jni] 2735 if (match_option(option, "-verbose", &tail)) { 2736 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2737 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2738 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2739 } else if (!strcmp(tail, ":gc")) { 2740 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2741 } else if (!strcmp(tail, ":jni")) { 2742 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2743 return JNI_EINVAL; 2744 } 2745 } 2746 // -da / -ea / -disableassertions / -enableassertions 2747 // These accept an optional class/package name separated by a colon, e.g., 2748 // -da:java.lang.Thread. 2749 } else if (match_option(option, user_assertion_options, &tail, true)) { 2750 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2751 if (*tail == '\0') { 2752 JavaAssertions::setUserClassDefault(enable); 2753 } else { 2754 assert(*tail == ':', "bogus match by match_option()"); 2755 JavaAssertions::addOption(tail + 1, enable); 2756 } 2757 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2758 } else if (match_option(option, system_assertion_options, &tail, false)) { 2759 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2760 JavaAssertions::setSystemClassDefault(enable); 2761 // -bootclasspath: 2762 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2763 jio_fprintf(defaultStream::output_stream(), 2764 "-Xbootclasspath is no longer a supported option.\n"); 2765 return JNI_EINVAL; 2766 // -bootclasspath/a: 2767 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2768 Arguments::set_bootclassloader_append_index((int)strlen(Arguments::get_sysclasspath())+1); 2769 Arguments::append_sysclasspath(tail); 2770 // -bootclasspath/p: 2771 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2772 jio_fprintf(defaultStream::output_stream(), 2773 "-Xbootclasspath/p is no longer a supported option.\n"); 2774 return JNI_EINVAL; 2775 // -Xrun 2776 } else if (match_option(option, "-Xrun", &tail)) { 2777 if (tail != NULL) { 2778 const char* pos = strchr(tail, ':'); 2779 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2780 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2781 name[len] = '\0'; 2782 2783 char *options = NULL; 2784 if(pos != NULL) { 2785 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2786 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2787 } 2788 #if !INCLUDE_JVMTI 2789 if (strcmp(name, "jdwp") == 0) { 2790 jio_fprintf(defaultStream::error_stream(), 2791 "Debugging agents are not supported in this VM\n"); 2792 return JNI_ERR; 2793 } 2794 #endif // !INCLUDE_JVMTI 2795 add_init_library(name, options); 2796 } 2797 } else if (match_option(option, "--add-reads=", &tail)) { 2798 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2799 return JNI_ENOMEM; 2800 } 2801 } else if (match_option(option, "--add-exports=", &tail)) { 2802 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2803 return JNI_ENOMEM; 2804 } 2805 } else if (match_option(option, "--add-modules=", &tail)) { 2806 add_modules_value = tail; 2807 } else if (match_option(option, "--limit-modules=", &tail)) { 2808 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2809 return JNI_ENOMEM; 2810 } 2811 } else if (match_option(option, "--module-path=", &tail)) { 2812 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2813 return JNI_ENOMEM; 2814 } 2815 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2816 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2817 return JNI_ENOMEM; 2818 } 2819 } else if (match_option(option, "--patch-module=", &tail)) { 2820 // --patch-module=<module>=<file>(<pathsep><file>)* 2821 int res = process_patch_mod_option(tail, patch_mod_javabase); 2822 if (res != JNI_OK) { 2823 return res; 2824 } 2825 // -agentlib and -agentpath 2826 } else if (match_option(option, "-agentlib:", &tail) || 2827 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2828 if(tail != NULL) { 2829 const char* pos = strchr(tail, '='); 2830 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2831 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2832 name[len] = '\0'; 2833 2834 char *options = NULL; 2835 if(pos != NULL) { 2836 options = os::strdup_check_oom(pos + 1, mtArguments); 2837 } 2838 #if !INCLUDE_JVMTI 2839 if (valid_jdwp_agent(name, is_absolute_path)) { 2840 jio_fprintf(defaultStream::error_stream(), 2841 "Debugging agents are not supported in this VM\n"); 2842 return JNI_ERR; 2843 } 2844 #endif // !INCLUDE_JVMTI 2845 add_init_agent(name, options, is_absolute_path); 2846 } 2847 // -javaagent 2848 } else if (match_option(option, "-javaagent:", &tail)) { 2849 #if !INCLUDE_JVMTI 2850 jio_fprintf(defaultStream::error_stream(), 2851 "Instrumentation agents are not supported in this VM\n"); 2852 return JNI_ERR; 2853 #else 2854 if (tail != NULL) { 2855 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail); 2856 add_init_agent("instrument", options, false); 2857 // java agents need module java.instrument 2858 if (!Arguments::append_to_addmods_property("java.instrument")) { 2859 return JNI_ENOMEM; 2860 } 2861 } 2862 #endif // !INCLUDE_JVMTI 2863 // -Xnoclassgc 2864 } else if (match_option(option, "-Xnoclassgc")) { 2865 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2866 return JNI_EINVAL; 2867 } 2868 // -Xconcgc 2869 } else if (match_option(option, "-Xconcgc")) { 2870 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2871 return JNI_EINVAL; 2872 } 2873 // -Xnoconcgc 2874 } else if (match_option(option, "-Xnoconcgc")) { 2875 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2876 return JNI_EINVAL; 2877 } 2878 // -Xbatch 2879 } else if (match_option(option, "-Xbatch")) { 2880 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2881 return JNI_EINVAL; 2882 } 2883 // -Xmn for compatibility with other JVM vendors 2884 } else if (match_option(option, "-Xmn", &tail)) { 2885 julong long_initial_young_size = 0; 2886 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2887 if (errcode != arg_in_range) { 2888 jio_fprintf(defaultStream::error_stream(), 2889 "Invalid initial young generation size: %s\n", option->optionString); 2890 describe_range_error(errcode); 2891 return JNI_EINVAL; 2892 } 2893 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2894 return JNI_EINVAL; 2895 } 2896 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2897 return JNI_EINVAL; 2898 } 2899 // -Xms 2900 } else if (match_option(option, "-Xms", &tail)) { 2901 julong long_initial_heap_size = 0; 2902 // an initial heap size of 0 means automatically determine 2903 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2904 if (errcode != arg_in_range) { 2905 jio_fprintf(defaultStream::error_stream(), 2906 "Invalid initial heap size: %s\n", option->optionString); 2907 describe_range_error(errcode); 2908 return JNI_EINVAL; 2909 } 2910 set_min_heap_size((size_t)long_initial_heap_size); 2911 // Currently the minimum size and the initial heap sizes are the same. 2912 // Can be overridden with -XX:InitialHeapSize. 2913 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2914 return JNI_EINVAL; 2915 } 2916 // -Xmx 2917 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2918 julong long_max_heap_size = 0; 2919 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2920 if (errcode != arg_in_range) { 2921 jio_fprintf(defaultStream::error_stream(), 2922 "Invalid maximum heap size: %s\n", option->optionString); 2923 describe_range_error(errcode); 2924 return JNI_EINVAL; 2925 } 2926 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2927 return JNI_EINVAL; 2928 } 2929 // Xmaxf 2930 } else if (match_option(option, "-Xmaxf", &tail)) { 2931 char* err; 2932 int maxf = (int)(strtod(tail, &err) * 100); 2933 if (*err != '\0' || *tail == '\0') { 2934 jio_fprintf(defaultStream::error_stream(), 2935 "Bad max heap free percentage size: %s\n", 2936 option->optionString); 2937 return JNI_EINVAL; 2938 } else { 2939 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2940 return JNI_EINVAL; 2941 } 2942 } 2943 // Xminf 2944 } else if (match_option(option, "-Xminf", &tail)) { 2945 char* err; 2946 int minf = (int)(strtod(tail, &err) * 100); 2947 if (*err != '\0' || *tail == '\0') { 2948 jio_fprintf(defaultStream::error_stream(), 2949 "Bad min heap free percentage size: %s\n", 2950 option->optionString); 2951 return JNI_EINVAL; 2952 } else { 2953 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2954 return JNI_EINVAL; 2955 } 2956 } 2957 // -Xss 2958 } else if (match_option(option, "-Xss", &tail)) { 2959 julong long_ThreadStackSize = 0; 2960 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2961 if (errcode != arg_in_range) { 2962 jio_fprintf(defaultStream::error_stream(), 2963 "Invalid thread stack size: %s\n", option->optionString); 2964 describe_range_error(errcode); 2965 return JNI_EINVAL; 2966 } 2967 // Internally track ThreadStackSize in units of 1024 bytes. 2968 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2969 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2970 return JNI_EINVAL; 2971 } 2972 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 2973 } else if (match_option(option, "-Xoss", &tail) || 2974 match_option(option, "-Xsqnopause") || 2975 match_option(option, "-Xoptimize") || 2976 match_option(option, "-Xboundthreads") || 2977 match_option(option, "-Xusealtsigs")) { 2978 // All these options are deprecated in JDK 9 and will be removed in a future release 2979 char version[256]; 2980 JDK_Version::jdk(9).to_string(version, sizeof(version)); 2981 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2982 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2983 julong long_CodeCacheExpansionSize = 0; 2984 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2985 if (errcode != arg_in_range) { 2986 jio_fprintf(defaultStream::error_stream(), 2987 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2988 os::vm_page_size()/K); 2989 return JNI_EINVAL; 2990 } 2991 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2995 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2996 julong long_ReservedCodeCacheSize = 0; 2997 2998 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2999 if (errcode != arg_in_range) { 3000 jio_fprintf(defaultStream::error_stream(), 3001 "Invalid maximum code cache size: %s.\n", option->optionString); 3002 return JNI_EINVAL; 3003 } 3004 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3005 return JNI_EINVAL; 3006 } 3007 // -XX:NonNMethodCodeHeapSize= 3008 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3009 julong long_NonNMethodCodeHeapSize = 0; 3010 3011 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3012 if (errcode != arg_in_range) { 3013 jio_fprintf(defaultStream::error_stream(), 3014 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3015 return JNI_EINVAL; 3016 } 3017 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3018 return JNI_EINVAL; 3019 } 3020 // -XX:ProfiledCodeHeapSize= 3021 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3022 julong long_ProfiledCodeHeapSize = 0; 3023 3024 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3025 if (errcode != arg_in_range) { 3026 jio_fprintf(defaultStream::error_stream(), 3027 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3028 return JNI_EINVAL; 3029 } 3030 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3031 return JNI_EINVAL; 3032 } 3033 // -XX:NonProfiledCodeHeapSizee= 3034 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3035 julong long_NonProfiledCodeHeapSize = 0; 3036 3037 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3038 if (errcode != arg_in_range) { 3039 jio_fprintf(defaultStream::error_stream(), 3040 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3041 return JNI_EINVAL; 3042 } 3043 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3044 return JNI_EINVAL; 3045 } 3046 // -green 3047 } else if (match_option(option, "-green")) { 3048 jio_fprintf(defaultStream::error_stream(), 3049 "Green threads support not available\n"); 3050 return JNI_EINVAL; 3051 // -native 3052 } else if (match_option(option, "-native")) { 3053 // HotSpot always uses native threads, ignore silently for compatibility 3054 // -Xrs 3055 } else if (match_option(option, "-Xrs")) { 3056 // Classic/EVM option, new functionality 3057 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3058 return JNI_EINVAL; 3059 } 3060 // -Xprof 3061 } else if (match_option(option, "-Xprof")) { 3062 #if INCLUDE_FPROF 3063 _has_profile = true; 3064 #else // INCLUDE_FPROF 3065 jio_fprintf(defaultStream::error_stream(), 3066 "Flat profiling is not supported in this VM.\n"); 3067 return JNI_ERR; 3068 #endif // INCLUDE_FPROF 3069 // -Xconcurrentio 3070 } else if (match_option(option, "-Xconcurrentio")) { 3071 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3072 return JNI_EINVAL; 3073 } 3074 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3075 return JNI_EINVAL; 3076 } 3077 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3078 return JNI_EINVAL; 3079 } 3080 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3081 return JNI_EINVAL; 3082 } 3083 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3084 return JNI_EINVAL; 3085 } 3086 3087 // -Xinternalversion 3088 } else if (match_option(option, "-Xinternalversion")) { 3089 jio_fprintf(defaultStream::output_stream(), "%s\n", 3090 VM_Version::internal_vm_info_string()); 3091 vm_exit(0); 3092 #ifndef PRODUCT 3093 // -Xprintflags 3094 } else if (match_option(option, "-Xprintflags")) { 3095 CommandLineFlags::printFlags(tty, false); 3096 vm_exit(0); 3097 #endif 3098 // -D 3099 } else if (match_option(option, "-D", &tail)) { 3100 const char* value; 3101 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3102 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3103 // abort if -Djava.endorsed.dirs is set 3104 jio_fprintf(defaultStream::output_stream(), 3105 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3106 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3107 return JNI_EINVAL; 3108 } 3109 if (match_option(option, "-Djava.ext.dirs=", &value) && 3110 *value != '\0' && strcmp(value, "\"\"") != 0) { 3111 // abort if -Djava.ext.dirs is set 3112 jio_fprintf(defaultStream::output_stream(), 3113 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3114 return JNI_EINVAL; 3115 } 3116 // Check for module related properties. They must be set using the modules 3117 // options. For example: use "--add-modules=java.sql", not 3118 // "-Djdk.module.addmods=java.sql" 3119 if (is_internal_module_property(option->optionString + 2)) { 3120 needs_module_property_warning = true; 3121 continue; 3122 } 3123 3124 if (!add_property(tail)) { 3125 return JNI_ENOMEM; 3126 } 3127 // Out of the box management support 3128 if (match_option(option, "-Dcom.sun.management", &tail)) { 3129 #if INCLUDE_MANAGEMENT 3130 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3131 return JNI_EINVAL; 3132 } 3133 // management agent in module java.management 3134 if (!Arguments::append_to_addmods_property("java.management")) { 3135 return JNI_ENOMEM; 3136 } 3137 #else 3138 jio_fprintf(defaultStream::output_stream(), 3139 "-Dcom.sun.management is not supported in this VM.\n"); 3140 return JNI_ERR; 3141 #endif 3142 } 3143 // -Xint 3144 } else if (match_option(option, "-Xint")) { 3145 set_mode_flags(_int); 3146 // -Xmixed 3147 } else if (match_option(option, "-Xmixed")) { 3148 set_mode_flags(_mixed); 3149 // -Xcomp 3150 } else if (match_option(option, "-Xcomp")) { 3151 // for testing the compiler; turn off all flags that inhibit compilation 3152 set_mode_flags(_comp); 3153 // -Xshare:dump 3154 } else if (match_option(option, "-Xshare:dump")) { 3155 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3156 return JNI_EINVAL; 3157 } 3158 set_mode_flags(_int); // Prevent compilation, which creates objects 3159 // -Xshare:on 3160 } else if (match_option(option, "-Xshare:on")) { 3161 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3162 return JNI_EINVAL; 3163 } 3164 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3165 return JNI_EINVAL; 3166 } 3167 // -Xshare:auto 3168 } else if (match_option(option, "-Xshare:auto")) { 3169 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3170 return JNI_EINVAL; 3171 } 3172 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3173 return JNI_EINVAL; 3174 } 3175 // -Xshare:off 3176 } else if (match_option(option, "-Xshare:off")) { 3177 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3178 return JNI_EINVAL; 3179 } 3180 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3181 return JNI_EINVAL; 3182 } 3183 // -Xverify 3184 } else if (match_option(option, "-Xverify", &tail)) { 3185 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3186 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3187 return JNI_EINVAL; 3188 } 3189 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3190 return JNI_EINVAL; 3191 } 3192 } else if (strcmp(tail, ":remote") == 0) { 3193 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3194 return JNI_EINVAL; 3195 } 3196 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3197 return JNI_EINVAL; 3198 } 3199 } else if (strcmp(tail, ":none") == 0) { 3200 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3201 return JNI_EINVAL; 3202 } 3203 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3204 return JNI_EINVAL; 3205 } 3206 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3207 return JNI_EINVAL; 3208 } 3209 // -Xdebug 3210 } else if (match_option(option, "-Xdebug")) { 3211 // note this flag has been used, then ignore 3212 set_xdebug_mode(true); 3213 // -Xnoagent 3214 } else if (match_option(option, "-Xnoagent")) { 3215 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3216 } else if (match_option(option, "-Xloggc:", &tail)) { 3217 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3218 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3219 _gc_log_filename = os::strdup_check_oom(tail); 3220 } else if (match_option(option, "-Xlog", &tail)) { 3221 bool ret = false; 3222 if (strcmp(tail, ":help") == 0) { 3223 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3224 vm_exit(0); 3225 } else if (strcmp(tail, ":disable") == 0) { 3226 LogConfiguration::disable_logging(); 3227 ret = true; 3228 } else if (*tail == '\0') { 3229 ret = LogConfiguration::parse_command_line_arguments(); 3230 assert(ret, "-Xlog without arguments should never fail to parse"); 3231 } else if (*tail == ':') { 3232 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3233 } 3234 if (ret == false) { 3235 jio_fprintf(defaultStream::error_stream(), 3236 "Invalid -Xlog option '-Xlog%s'\n", 3237 tail); 3238 return JNI_EINVAL; 3239 } 3240 // JNI hooks 3241 } else if (match_option(option, "-Xcheck", &tail)) { 3242 if (!strcmp(tail, ":jni")) { 3243 #if !INCLUDE_JNI_CHECK 3244 warning("JNI CHECKING is not supported in this VM"); 3245 #else 3246 CheckJNICalls = true; 3247 #endif // INCLUDE_JNI_CHECK 3248 } else if (is_bad_option(option, args->ignoreUnrecognized, 3249 "check")) { 3250 return JNI_EINVAL; 3251 } 3252 } else if (match_option(option, "vfprintf")) { 3253 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3254 } else if (match_option(option, "exit")) { 3255 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3256 } else if (match_option(option, "abort")) { 3257 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3258 // -XX:+AggressiveHeap 3259 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3260 jint result = set_aggressive_heap_flags(); 3261 if (result != JNI_OK) { 3262 return result; 3263 } 3264 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3265 // and the last option wins. 3266 } else if (match_option(option, "-XX:+NeverTenure")) { 3267 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3268 return JNI_EINVAL; 3269 } 3270 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3271 return JNI_EINVAL; 3272 } 3273 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3274 return JNI_EINVAL; 3275 } 3276 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3277 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3278 return JNI_EINVAL; 3279 } 3280 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3281 return JNI_EINVAL; 3282 } 3283 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3284 return JNI_EINVAL; 3285 } 3286 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3287 uintx max_tenuring_thresh = 0; 3288 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3289 jio_fprintf(defaultStream::error_stream(), 3290 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3291 return JNI_EINVAL; 3292 } 3293 3294 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3295 return JNI_EINVAL; 3296 } 3297 3298 if (MaxTenuringThreshold == 0) { 3299 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3300 return JNI_EINVAL; 3301 } 3302 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3303 return JNI_EINVAL; 3304 } 3305 } else { 3306 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3307 return JNI_EINVAL; 3308 } 3309 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3310 return JNI_EINVAL; 3311 } 3312 } 3313 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3314 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3315 return JNI_EINVAL; 3316 } 3317 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3318 return JNI_EINVAL; 3319 } 3320 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3321 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3322 return JNI_EINVAL; 3323 } 3324 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3325 return JNI_EINVAL; 3326 } 3327 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3328 #if defined(DTRACE_ENABLED) 3329 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3330 return JNI_EINVAL; 3331 } 3332 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3333 return JNI_EINVAL; 3334 } 3335 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3336 return JNI_EINVAL; 3337 } 3338 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3339 return JNI_EINVAL; 3340 } 3341 #else // defined(DTRACE_ENABLED) 3342 jio_fprintf(defaultStream::error_stream(), 3343 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3344 return JNI_EINVAL; 3345 #endif // defined(DTRACE_ENABLED) 3346 #ifdef ASSERT 3347 } else if (match_option(option, "-XX:+FullGCALot")) { 3348 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3349 return JNI_EINVAL; 3350 } 3351 // disable scavenge before parallel mark-compact 3352 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3353 return JNI_EINVAL; 3354 } 3355 #endif 3356 #if !INCLUDE_MANAGEMENT 3357 } else if (match_option(option, "-XX:+ManagementServer")) { 3358 jio_fprintf(defaultStream::error_stream(), 3359 "ManagementServer is not supported in this VM.\n"); 3360 return JNI_ERR; 3361 #endif // INCLUDE_MANAGEMENT 3362 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3363 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3364 // already been handled 3365 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3366 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3367 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3368 return JNI_EINVAL; 3369 } 3370 } 3371 // Unknown option 3372 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3373 return JNI_ERR; 3374 } 3375 } 3376 3377 // PrintSharedArchiveAndExit will turn on 3378 // -Xshare:on 3379 // -Xlog:class+path=info 3380 if (PrintSharedArchiveAndExit) { 3381 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3382 return JNI_EINVAL; 3383 } 3384 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3385 return JNI_EINVAL; 3386 } 3387 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3388 } 3389 3390 // Change the default value for flags which have different default values 3391 // when working with older JDKs. 3392 #ifdef LINUX 3393 if (JDK_Version::current().compare_major(6) <= 0 && 3394 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3395 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3396 } 3397 #endif // LINUX 3398 fix_appclasspath(); 3399 return JNI_OK; 3400 } 3401 3402 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3403 // For java.base check for duplicate --patch-module options being specified on the command line. 3404 // This check is only required for java.base, all other duplicate module specifications 3405 // will be checked during module system initialization. The module system initialization 3406 // will throw an ExceptionInInitializerError if this situation occurs. 3407 if (strcmp(module_name, "java.base") == 0) { 3408 if (*patch_mod_javabase) { 3409 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module"); 3410 } else { 3411 *patch_mod_javabase = true; 3412 } 3413 } 3414 3415 // Create GrowableArray lazily, only if --patch-module has been specified 3416 if (_patch_mod_prefix == NULL) { 3417 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3418 } 3419 3420 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3421 } 3422 3423 // Set property jdk.boot.class.path.append to the contents of the bootclasspath 3424 // that follows either the jimage file or exploded module directories. The 3425 // property will contain -Xbootclasspath/a and/or jvmti appended additions. 3426 void Arguments::set_jdkbootclasspath_append() { 3427 char *sysclasspath = get_sysclasspath(); 3428 assert(sysclasspath != NULL, "NULL sysclasspath"); 3429 int bcp_a_idx = bootclassloader_append_index(); 3430 if (bcp_a_idx != -1 && bcp_a_idx < (int)strlen(sysclasspath)) { 3431 _jdk_boot_class_path_append->set_value(sysclasspath + bcp_a_idx); 3432 } 3433 } 3434 3435 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3436 // 3437 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3438 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3439 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3440 // path is treated as the current directory. 3441 // 3442 // This causes problems with CDS, which requires that all directories specified in the classpath 3443 // must be empty. In most cases, applications do NOT want to load classes from the current 3444 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3445 // scripts compatible with CDS. 3446 void Arguments::fix_appclasspath() { 3447 if (IgnoreEmptyClassPaths) { 3448 const char separator = *os::path_separator(); 3449 const char* src = _java_class_path->value(); 3450 3451 // skip over all the leading empty paths 3452 while (*src == separator) { 3453 src ++; 3454 } 3455 3456 char* copy = os::strdup_check_oom(src, mtArguments); 3457 3458 // trim all trailing empty paths 3459 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3460 *tail = '\0'; 3461 } 3462 3463 char from[3] = {separator, separator, '\0'}; 3464 char to [2] = {separator, '\0'}; 3465 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3466 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3467 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3468 } 3469 3470 _java_class_path->set_writeable_value(copy); 3471 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3472 } 3473 } 3474 3475 static bool has_jar_files(const char* directory) { 3476 DIR* dir = os::opendir(directory); 3477 if (dir == NULL) return false; 3478 3479 struct dirent *entry; 3480 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3481 bool hasJarFile = false; 3482 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3483 const char* name = entry->d_name; 3484 const char* ext = name + strlen(name) - 4; 3485 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3486 } 3487 FREE_C_HEAP_ARRAY(char, dbuf); 3488 os::closedir(dir); 3489 return hasJarFile ; 3490 } 3491 3492 static int check_non_empty_dirs(const char* path) { 3493 const char separator = *os::path_separator(); 3494 const char* const end = path + strlen(path); 3495 int nonEmptyDirs = 0; 3496 while (path < end) { 3497 const char* tmp_end = strchr(path, separator); 3498 if (tmp_end == NULL) { 3499 if (has_jar_files(path)) { 3500 nonEmptyDirs++; 3501 jio_fprintf(defaultStream::output_stream(), 3502 "Non-empty directory: %s\n", path); 3503 } 3504 path = end; 3505 } else { 3506 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3507 memcpy(dirpath, path, tmp_end - path); 3508 dirpath[tmp_end - path] = '\0'; 3509 if (has_jar_files(dirpath)) { 3510 nonEmptyDirs++; 3511 jio_fprintf(defaultStream::output_stream(), 3512 "Non-empty directory: %s\n", dirpath); 3513 } 3514 FREE_C_HEAP_ARRAY(char, dirpath); 3515 path = tmp_end + 1; 3516 } 3517 } 3518 return nonEmptyDirs; 3519 } 3520 3521 jint Arguments::finalize_vm_init_args() { 3522 // check if the default lib/endorsed directory exists; if so, error 3523 char path[JVM_MAXPATHLEN]; 3524 const char* fileSep = os::file_separator(); 3525 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3526 3527 if (CheckEndorsedAndExtDirs) { 3528 int nonEmptyDirs = 0; 3529 // check endorsed directory 3530 nonEmptyDirs += check_non_empty_dirs(path); 3531 // check the extension directories 3532 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3533 if (nonEmptyDirs > 0) { 3534 return JNI_ERR; 3535 } 3536 } 3537 3538 DIR* dir = os::opendir(path); 3539 if (dir != NULL) { 3540 jio_fprintf(defaultStream::output_stream(), 3541 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3542 "in modular form will be supported via the concept of upgradeable modules.\n"); 3543 os::closedir(dir); 3544 return JNI_ERR; 3545 } 3546 3547 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3548 dir = os::opendir(path); 3549 if (dir != NULL) { 3550 jio_fprintf(defaultStream::output_stream(), 3551 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3552 "Use -classpath instead.\n."); 3553 os::closedir(dir); 3554 return JNI_ERR; 3555 } 3556 3557 // Append the value of the last --add-modules option specified on the command line. 3558 // This needs to be done here, to prevent overwriting possible values written 3559 // to the jdk.module.addmods property by -javaagent and other options. 3560 if (add_modules_value != NULL) { 3561 if (!append_to_addmods_property(add_modules_value)) { 3562 return JNI_ENOMEM; 3563 } 3564 } 3565 3566 Arguments::set_bootclassloader_append_index(((int)strlen(Arguments::get_sysclasspath()))+1); 3567 3568 // This must be done after all arguments have been processed. 3569 // java_compiler() true means set to "NONE" or empty. 3570 if (java_compiler() && !xdebug_mode()) { 3571 // For backwards compatibility, we switch to interpreted mode if 3572 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3573 // not specified. 3574 set_mode_flags(_int); 3575 } 3576 3577 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3578 // but like -Xint, leave compilation thresholds unaffected. 3579 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3580 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3581 set_mode_flags(_int); 3582 } 3583 3584 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3585 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3586 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3587 } 3588 3589 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3590 // Don't degrade server performance for footprint 3591 if (FLAG_IS_DEFAULT(UseLargePages) && 3592 MaxHeapSize < LargePageHeapSizeThreshold) { 3593 // No need for large granularity pages w/small heaps. 3594 // Note that large pages are enabled/disabled for both the 3595 // Java heap and the code cache. 3596 FLAG_SET_DEFAULT(UseLargePages, false); 3597 } 3598 3599 #elif defined(COMPILER2) 3600 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3601 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3602 } 3603 #endif 3604 3605 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3606 UNSUPPORTED_OPTION(ProfileInterpreter); 3607 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3608 #endif 3609 3610 #ifndef TIERED 3611 // Tiered compilation is undefined. 3612 UNSUPPORTED_OPTION(TieredCompilation); 3613 #endif 3614 3615 #if INCLUDE_JVMCI 3616 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) { 3617 return JNI_ENOMEM; 3618 } 3619 #endif 3620 3621 // If we are running in a headless jre, force java.awt.headless property 3622 // to be true unless the property has already been set. 3623 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3624 if (os::is_headless_jre()) { 3625 const char* headless = Arguments::get_property("java.awt.headless"); 3626 if (headless == NULL) { 3627 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3628 if (headless_env == NULL) { 3629 if (!add_property("java.awt.headless=true")) { 3630 return JNI_ENOMEM; 3631 } 3632 } else { 3633 char buffer[256]; 3634 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3635 if (!add_property(buffer)) { 3636 return JNI_ENOMEM; 3637 } 3638 } 3639 } 3640 } 3641 3642 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3643 // CMS can only be used with ParNew 3644 FLAG_SET_ERGO(bool, UseParNewGC, true); 3645 } 3646 3647 if (!check_vm_args_consistency()) { 3648 return JNI_ERR; 3649 } 3650 3651 return JNI_OK; 3652 } 3653 3654 // Helper class for controlling the lifetime of JavaVMInitArgs 3655 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3656 // deleted on the destruction of the ScopedVMInitArgs object. 3657 class ScopedVMInitArgs : public StackObj { 3658 private: 3659 JavaVMInitArgs _args; 3660 char* _container_name; 3661 bool _is_set; 3662 char* _vm_options_file_arg; 3663 3664 public: 3665 ScopedVMInitArgs(const char *container_name) { 3666 _args.version = JNI_VERSION_1_2; 3667 _args.nOptions = 0; 3668 _args.options = NULL; 3669 _args.ignoreUnrecognized = false; 3670 _container_name = (char *)container_name; 3671 _is_set = false; 3672 _vm_options_file_arg = NULL; 3673 } 3674 3675 // Populates the JavaVMInitArgs object represented by this 3676 // ScopedVMInitArgs object with the arguments in options. The 3677 // allocated memory is deleted by the destructor. If this method 3678 // returns anything other than JNI_OK, then this object is in a 3679 // partially constructed state, and should be abandoned. 3680 jint set_args(GrowableArray<JavaVMOption>* options) { 3681 _is_set = true; 3682 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3683 JavaVMOption, options->length(), mtArguments); 3684 if (options_arr == NULL) { 3685 return JNI_ENOMEM; 3686 } 3687 _args.options = options_arr; 3688 3689 for (int i = 0; i < options->length(); i++) { 3690 options_arr[i] = options->at(i); 3691 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3692 if (options_arr[i].optionString == NULL) { 3693 // Rely on the destructor to do cleanup. 3694 _args.nOptions = i; 3695 return JNI_ENOMEM; 3696 } 3697 } 3698 3699 _args.nOptions = options->length(); 3700 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3701 return JNI_OK; 3702 } 3703 3704 JavaVMInitArgs* get() { return &_args; } 3705 char* container_name() { return _container_name; } 3706 bool is_set() { return _is_set; } 3707 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3708 char* vm_options_file_arg() { return _vm_options_file_arg; } 3709 3710 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3711 if (_vm_options_file_arg != NULL) { 3712 os::free(_vm_options_file_arg); 3713 } 3714 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3715 } 3716 3717 ~ScopedVMInitArgs() { 3718 if (_vm_options_file_arg != NULL) { 3719 os::free(_vm_options_file_arg); 3720 } 3721 if (_args.options == NULL) return; 3722 for (int i = 0; i < _args.nOptions; i++) { 3723 os::free(_args.options[i].optionString); 3724 } 3725 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3726 } 3727 3728 // Insert options into this option list, to replace option at 3729 // vm_options_file_pos (-XX:VMOptionsFile) 3730 jint insert(const JavaVMInitArgs* args, 3731 const JavaVMInitArgs* args_to_insert, 3732 const int vm_options_file_pos) { 3733 assert(_args.options == NULL, "shouldn't be set yet"); 3734 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3735 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3736 3737 int length = args->nOptions + args_to_insert->nOptions - 1; 3738 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3739 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3740 for (int i = 0; i < args->nOptions; i++) { 3741 if (i == vm_options_file_pos) { 3742 // insert the new options starting at the same place as the 3743 // -XX:VMOptionsFile option 3744 for (int j = 0; j < args_to_insert->nOptions; j++) { 3745 options->push(args_to_insert->options[j]); 3746 } 3747 } else { 3748 options->push(args->options[i]); 3749 } 3750 } 3751 // make into options array 3752 jint result = set_args(options); 3753 delete options; 3754 return result; 3755 } 3756 }; 3757 3758 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3759 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3760 } 3761 3762 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3763 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3764 } 3765 3766 jint Arguments::parse_options_environment_variable(const char* name, 3767 ScopedVMInitArgs* vm_args) { 3768 char *buffer = ::getenv(name); 3769 3770 // Don't check this environment variable if user has special privileges 3771 // (e.g. unix su command). 3772 if (buffer == NULL || os::have_special_privileges()) { 3773 return JNI_OK; 3774 } 3775 3776 if ((buffer = os::strdup(buffer)) == NULL) { 3777 return JNI_ENOMEM; 3778 } 3779 3780 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3781 3782 os::free(buffer); 3783 return retcode; 3784 } 3785 3786 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3787 // read file into buffer 3788 int fd = ::open(file_name, O_RDONLY); 3789 if (fd < 0) { 3790 jio_fprintf(defaultStream::error_stream(), 3791 "Could not open options file '%s'\n", 3792 file_name); 3793 return JNI_ERR; 3794 } 3795 3796 struct stat stbuf; 3797 int retcode = os::stat(file_name, &stbuf); 3798 if (retcode != 0) { 3799 jio_fprintf(defaultStream::error_stream(), 3800 "Could not stat options file '%s'\n", 3801 file_name); 3802 os::close(fd); 3803 return JNI_ERR; 3804 } 3805 3806 if (stbuf.st_size == 0) { 3807 // tell caller there is no option data and that is ok 3808 os::close(fd); 3809 return JNI_OK; 3810 } 3811 3812 // '+ 1' for NULL termination even with max bytes 3813 size_t bytes_alloc = stbuf.st_size + 1; 3814 3815 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3816 if (NULL == buf) { 3817 jio_fprintf(defaultStream::error_stream(), 3818 "Could not allocate read buffer for options file parse\n"); 3819 os::close(fd); 3820 return JNI_ENOMEM; 3821 } 3822 3823 memset(buf, 0, bytes_alloc); 3824 3825 // Fill buffer 3826 // Use ::read() instead of os::read because os::read() 3827 // might do a thread state transition 3828 // and it is too early for that here 3829 3830 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3831 os::close(fd); 3832 if (bytes_read < 0) { 3833 FREE_C_HEAP_ARRAY(char, buf); 3834 jio_fprintf(defaultStream::error_stream(), 3835 "Could not read options file '%s'\n", file_name); 3836 return JNI_ERR; 3837 } 3838 3839 if (bytes_read == 0) { 3840 // tell caller there is no option data and that is ok 3841 FREE_C_HEAP_ARRAY(char, buf); 3842 return JNI_OK; 3843 } 3844 3845 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3846 3847 FREE_C_HEAP_ARRAY(char, buf); 3848 return retcode; 3849 } 3850 3851 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3852 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3853 3854 // some pointers to help with parsing 3855 char *buffer_end = buffer + buf_len; 3856 char *opt_hd = buffer; 3857 char *wrt = buffer; 3858 char *rd = buffer; 3859 3860 // parse all options 3861 while (rd < buffer_end) { 3862 // skip leading white space from the input string 3863 while (rd < buffer_end && isspace(*rd)) { 3864 rd++; 3865 } 3866 3867 if (rd >= buffer_end) { 3868 break; 3869 } 3870 3871 // Remember this is where we found the head of the token. 3872 opt_hd = wrt; 3873 3874 // Tokens are strings of non white space characters separated 3875 // by one or more white spaces. 3876 while (rd < buffer_end && !isspace(*rd)) { 3877 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3878 int quote = *rd; // matching quote to look for 3879 rd++; // don't copy open quote 3880 while (rd < buffer_end && *rd != quote) { 3881 // include everything (even spaces) 3882 // up until the close quote 3883 *wrt++ = *rd++; // copy to option string 3884 } 3885 3886 if (rd < buffer_end) { 3887 rd++; // don't copy close quote 3888 } else { 3889 // did not see closing quote 3890 jio_fprintf(defaultStream::error_stream(), 3891 "Unmatched quote in %s\n", name); 3892 delete options; 3893 return JNI_ERR; 3894 } 3895 } else { 3896 *wrt++ = *rd++; // copy to option string 3897 } 3898 } 3899 3900 // steal a white space character and set it to NULL 3901 *wrt++ = '\0'; 3902 // We now have a complete token 3903 3904 JavaVMOption option; 3905 option.optionString = opt_hd; 3906 option.extraInfo = NULL; 3907 3908 options->append(option); // Fill in option 3909 3910 rd++; // Advance to next character 3911 } 3912 3913 // Fill out JavaVMInitArgs structure. 3914 jint status = vm_args->set_args(options); 3915 3916 delete options; 3917 return status; 3918 } 3919 3920 void Arguments::set_shared_spaces_flags() { 3921 if (DumpSharedSpaces) { 3922 if (Arguments::get_patch_mod_prefix() != NULL) { 3923 vm_exit_during_initialization( 3924 "Cannot use the following option when dumping the shared archive: --patch-module"); 3925 } 3926 3927 if (RequireSharedSpaces) { 3928 warning("Cannot dump shared archive while using shared archive"); 3929 } 3930 UseSharedSpaces = false; 3931 #ifdef _LP64 3932 if (!UseCompressedOops || !UseCompressedClassPointers) { 3933 vm_exit_during_initialization( 3934 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3935 } 3936 } else { 3937 if (!UseCompressedOops || !UseCompressedClassPointers) { 3938 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3939 } 3940 #endif 3941 } 3942 } 3943 3944 // Sharing support 3945 // Construct the path to the archive 3946 static char* get_shared_archive_path() { 3947 char *shared_archive_path; 3948 if (SharedArchiveFile == NULL) { 3949 char jvm_path[JVM_MAXPATHLEN]; 3950 os::jvm_path(jvm_path, sizeof(jvm_path)); 3951 char *end = strrchr(jvm_path, *os::file_separator()); 3952 if (end != NULL) *end = '\0'; 3953 size_t jvm_path_len = strlen(jvm_path); 3954 size_t file_sep_len = strlen(os::file_separator()); 3955 const size_t len = jvm_path_len + file_sep_len + 20; 3956 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3957 if (shared_archive_path != NULL) { 3958 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3959 jvm_path, os::file_separator()); 3960 } 3961 } else { 3962 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3963 } 3964 return shared_archive_path; 3965 } 3966 3967 #ifndef PRODUCT 3968 // Determine whether LogVMOutput should be implicitly turned on. 3969 static bool use_vm_log() { 3970 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3971 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3972 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3973 PrintAssembly || TraceDeoptimization || TraceDependencies || 3974 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3975 return true; 3976 } 3977 3978 #ifdef COMPILER1 3979 if (PrintC1Statistics) { 3980 return true; 3981 } 3982 #endif // COMPILER1 3983 3984 #ifdef COMPILER2 3985 if (PrintOptoAssembly || PrintOptoStatistics) { 3986 return true; 3987 } 3988 #endif // COMPILER2 3989 3990 return false; 3991 } 3992 3993 #endif // PRODUCT 3994 3995 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3996 for (int index = 0; index < args->nOptions; index++) { 3997 const JavaVMOption* option = args->options + index; 3998 const char* tail; 3999 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4000 return true; 4001 } 4002 } 4003 return false; 4004 } 4005 4006 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4007 const char* vm_options_file, 4008 const int vm_options_file_pos, 4009 ScopedVMInitArgs* vm_options_file_args, 4010 ScopedVMInitArgs* args_out) { 4011 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4012 if (code != JNI_OK) { 4013 return code; 4014 } 4015 4016 if (vm_options_file_args->get()->nOptions < 1) { 4017 return JNI_OK; 4018 } 4019 4020 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4021 jio_fprintf(defaultStream::error_stream(), 4022 "A VM options file may not refer to a VM options file. " 4023 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4024 "options file '%s' in options container '%s' is an error.\n", 4025 vm_options_file_args->vm_options_file_arg(), 4026 vm_options_file_args->container_name()); 4027 return JNI_EINVAL; 4028 } 4029 4030 return args_out->insert(args, vm_options_file_args->get(), 4031 vm_options_file_pos); 4032 } 4033 4034 // Expand -XX:VMOptionsFile found in args_in as needed. 4035 // mod_args and args_out parameters may return values as needed. 4036 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4037 ScopedVMInitArgs* mod_args, 4038 JavaVMInitArgs** args_out) { 4039 jint code = match_special_option_and_act(args_in, mod_args); 4040 if (code != JNI_OK) { 4041 return code; 4042 } 4043 4044 if (mod_args->is_set()) { 4045 // args_in contains -XX:VMOptionsFile and mod_args contains the 4046 // original options from args_in along with the options expanded 4047 // from the VMOptionsFile. Return a short-hand to the caller. 4048 *args_out = mod_args->get(); 4049 } else { 4050 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4051 } 4052 return JNI_OK; 4053 } 4054 4055 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4056 ScopedVMInitArgs* args_out) { 4057 // Remaining part of option string 4058 const char* tail; 4059 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4060 4061 for (int index = 0; index < args->nOptions; index++) { 4062 const JavaVMOption* option = args->options + index; 4063 if (ArgumentsExt::process_options(option)) { 4064 continue; 4065 } 4066 if (match_option(option, "-XX:Flags=", &tail)) { 4067 Arguments::set_jvm_flags_file(tail); 4068 continue; 4069 } 4070 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4071 if (vm_options_file_args.found_vm_options_file_arg()) { 4072 jio_fprintf(defaultStream::error_stream(), 4073 "The option '%s' is already specified in the options " 4074 "container '%s' so the specification of '%s' in the " 4075 "same options container is an error.\n", 4076 vm_options_file_args.vm_options_file_arg(), 4077 vm_options_file_args.container_name(), 4078 option->optionString); 4079 return JNI_EINVAL; 4080 } 4081 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4082 // If there's a VMOptionsFile, parse that 4083 jint code = insert_vm_options_file(args, tail, index, 4084 &vm_options_file_args, args_out); 4085 if (code != JNI_OK) { 4086 return code; 4087 } 4088 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4089 if (args_out->is_set()) { 4090 // The VMOptions file inserted some options so switch 'args' 4091 // to the new set of options, and continue processing which 4092 // preserves "last option wins" semantics. 4093 args = args_out->get(); 4094 // The first option from the VMOptionsFile replaces the 4095 // current option. So we back track to process the 4096 // replacement option. 4097 index--; 4098 } 4099 continue; 4100 } 4101 if (match_option(option, "-XX:+PrintVMOptions")) { 4102 PrintVMOptions = true; 4103 continue; 4104 } 4105 if (match_option(option, "-XX:-PrintVMOptions")) { 4106 PrintVMOptions = false; 4107 continue; 4108 } 4109 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4110 IgnoreUnrecognizedVMOptions = true; 4111 continue; 4112 } 4113 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4114 IgnoreUnrecognizedVMOptions = false; 4115 continue; 4116 } 4117 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4118 CommandLineFlags::printFlags(tty, false); 4119 vm_exit(0); 4120 } 4121 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4122 #if INCLUDE_NMT 4123 // The launcher did not setup nmt environment variable properly. 4124 if (!MemTracker::check_launcher_nmt_support(tail)) { 4125 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4126 } 4127 4128 // Verify if nmt option is valid. 4129 if (MemTracker::verify_nmt_option()) { 4130 // Late initialization, still in single-threaded mode. 4131 if (MemTracker::tracking_level() >= NMT_summary) { 4132 MemTracker::init(); 4133 } 4134 } else { 4135 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4136 } 4137 continue; 4138 #else 4139 jio_fprintf(defaultStream::error_stream(), 4140 "Native Memory Tracking is not supported in this VM\n"); 4141 return JNI_ERR; 4142 #endif 4143 } 4144 4145 #ifndef PRODUCT 4146 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4147 CommandLineFlags::printFlags(tty, true); 4148 vm_exit(0); 4149 } 4150 #endif 4151 } 4152 return JNI_OK; 4153 } 4154 4155 static void print_options(const JavaVMInitArgs *args) { 4156 const char* tail; 4157 for (int index = 0; index < args->nOptions; index++) { 4158 const JavaVMOption *option = args->options + index; 4159 if (match_option(option, "-XX:", &tail)) { 4160 logOption(tail); 4161 } 4162 } 4163 } 4164 4165 bool Arguments::handle_deprecated_print_gc_flags() { 4166 if (PrintGC) { 4167 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4168 } 4169 if (PrintGCDetails) { 4170 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4171 } 4172 4173 if (_gc_log_filename != NULL) { 4174 // -Xloggc was used to specify a filename 4175 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4176 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL); 4177 } else if (PrintGC || PrintGCDetails) { 4178 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4179 } 4180 return true; 4181 } 4182 4183 // Parse entry point called from JNI_CreateJavaVM 4184 4185 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4186 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4187 4188 // Initialize ranges, constraints and writeables 4189 CommandLineFlagRangeList::init(); 4190 CommandLineFlagConstraintList::init(); 4191 CommandLineFlagWriteableList::init(); 4192 4193 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4194 const char* hotspotrc = ".hotspotrc"; 4195 bool settings_file_specified = false; 4196 bool needs_hotspotrc_warning = false; 4197 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4198 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4199 4200 // Pointers to current working set of containers 4201 JavaVMInitArgs* cur_cmd_args; 4202 JavaVMInitArgs* cur_java_options_args; 4203 JavaVMInitArgs* cur_java_tool_options_args; 4204 4205 // Containers for modified/expanded options 4206 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4207 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4208 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4209 4210 4211 jint code = 4212 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4213 if (code != JNI_OK) { 4214 return code; 4215 } 4216 4217 code = parse_java_options_environment_variable(&initial_java_options_args); 4218 if (code != JNI_OK) { 4219 return code; 4220 } 4221 4222 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4223 &mod_java_tool_options_args, 4224 &cur_java_tool_options_args); 4225 if (code != JNI_OK) { 4226 return code; 4227 } 4228 4229 code = expand_vm_options_as_needed(initial_cmd_args, 4230 &mod_cmd_args, 4231 &cur_cmd_args); 4232 if (code != JNI_OK) { 4233 return code; 4234 } 4235 4236 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4237 &mod_java_options_args, 4238 &cur_java_options_args); 4239 if (code != JNI_OK) { 4240 return code; 4241 } 4242 4243 const char* flags_file = Arguments::get_jvm_flags_file(); 4244 settings_file_specified = (flags_file != NULL); 4245 4246 if (IgnoreUnrecognizedVMOptions) { 4247 cur_cmd_args->ignoreUnrecognized = true; 4248 cur_java_tool_options_args->ignoreUnrecognized = true; 4249 cur_java_options_args->ignoreUnrecognized = true; 4250 } 4251 4252 // Parse specified settings file 4253 if (settings_file_specified) { 4254 if (!process_settings_file(flags_file, true, 4255 cur_cmd_args->ignoreUnrecognized)) { 4256 return JNI_EINVAL; 4257 } 4258 } else { 4259 #ifdef ASSERT 4260 // Parse default .hotspotrc settings file 4261 if (!process_settings_file(".hotspotrc", false, 4262 cur_cmd_args->ignoreUnrecognized)) { 4263 return JNI_EINVAL; 4264 } 4265 #else 4266 struct stat buf; 4267 if (os::stat(hotspotrc, &buf) == 0) { 4268 needs_hotspotrc_warning = true; 4269 } 4270 #endif 4271 } 4272 4273 if (PrintVMOptions) { 4274 print_options(cur_java_tool_options_args); 4275 print_options(cur_cmd_args); 4276 print_options(cur_java_options_args); 4277 } 4278 4279 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4280 jint result = parse_vm_init_args(cur_java_tool_options_args, 4281 cur_java_options_args, 4282 cur_cmd_args); 4283 4284 if (result != JNI_OK) { 4285 return result; 4286 } 4287 4288 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4289 SharedArchivePath = get_shared_archive_path(); 4290 if (SharedArchivePath == NULL) { 4291 return JNI_ENOMEM; 4292 } 4293 4294 // Set up VerifySharedSpaces 4295 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4296 VerifySharedSpaces = true; 4297 } 4298 4299 // Delay warning until here so that we've had a chance to process 4300 // the -XX:-PrintWarnings flag 4301 if (needs_hotspotrc_warning) { 4302 warning("%s file is present but has been ignored. " 4303 "Run with -XX:Flags=%s to load the file.", 4304 hotspotrc, hotspotrc); 4305 } 4306 4307 if (needs_module_property_warning) { 4308 warning("Ignoring system property options whose names start with '-Djdk.module'." 4309 " They are reserved for internal use."); 4310 } 4311 4312 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4313 UNSUPPORTED_OPTION(UseLargePages); 4314 #endif 4315 4316 ArgumentsExt::report_unsupported_options(); 4317 4318 #ifndef PRODUCT 4319 if (TraceBytecodesAt != 0) { 4320 TraceBytecodes = true; 4321 } 4322 if (CountCompiledCalls) { 4323 if (UseCounterDecay) { 4324 warning("UseCounterDecay disabled because CountCalls is set"); 4325 UseCounterDecay = false; 4326 } 4327 } 4328 #endif // PRODUCT 4329 4330 if (ScavengeRootsInCode == 0) { 4331 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4332 warning("Forcing ScavengeRootsInCode non-zero"); 4333 } 4334 ScavengeRootsInCode = 1; 4335 } 4336 4337 if (!handle_deprecated_print_gc_flags()) { 4338 return JNI_EINVAL; 4339 } 4340 4341 // Set object alignment values. 4342 set_object_alignment(); 4343 4344 #if !INCLUDE_CDS 4345 if (DumpSharedSpaces || RequireSharedSpaces) { 4346 jio_fprintf(defaultStream::error_stream(), 4347 "Shared spaces are not supported in this VM\n"); 4348 return JNI_ERR; 4349 } 4350 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4351 warning("Shared spaces are not supported in this VM"); 4352 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4353 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4354 } 4355 no_shared_spaces("CDS Disabled"); 4356 #endif // INCLUDE_CDS 4357 4358 return JNI_OK; 4359 } 4360 4361 jint Arguments::apply_ergo() { 4362 4363 // Set flags based on ergonomics. 4364 set_ergonomics_flags(); 4365 4366 set_shared_spaces_flags(); 4367 4368 // Check the GC selections again. 4369 if (!check_gc_consistency()) { 4370 return JNI_EINVAL; 4371 } 4372 4373 if (TieredCompilation) { 4374 set_tiered_flags(); 4375 } else { 4376 int max_compilation_policy_choice = 1; 4377 #ifdef COMPILER2 4378 max_compilation_policy_choice = 2; 4379 #endif 4380 // Check if the policy is valid. 4381 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4382 vm_exit_during_initialization( 4383 "Incompatible compilation policy selected", NULL); 4384 } 4385 // Scale CompileThreshold 4386 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4387 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4388 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4389 } 4390 } 4391 4392 #ifdef COMPILER2 4393 #ifndef PRODUCT 4394 if (PrintIdealGraphLevel > 0) { 4395 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4396 } 4397 #endif 4398 #endif 4399 4400 // Set heap size based on available physical memory 4401 set_heap_size(); 4402 4403 ArgumentsExt::set_gc_specific_flags(); 4404 4405 // Initialize Metaspace flags and alignments 4406 Metaspace::ergo_initialize(); 4407 4408 // Set bytecode rewriting flags 4409 set_bytecode_flags(); 4410 4411 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4412 jint code = set_aggressive_opts_flags(); 4413 if (code != JNI_OK) { 4414 return code; 4415 } 4416 4417 // Turn off biased locking for locking debug mode flags, 4418 // which are subtly different from each other but neither works with 4419 // biased locking 4420 if (UseHeavyMonitors 4421 #ifdef COMPILER1 4422 || !UseFastLocking 4423 #endif // COMPILER1 4424 #if INCLUDE_JVMCI 4425 || !JVMCIUseFastLocking 4426 #endif 4427 ) { 4428 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4429 // flag set to true on command line; warn the user that they 4430 // can't enable biased locking here 4431 warning("Biased Locking is not supported with locking debug flags" 4432 "; ignoring UseBiasedLocking flag." ); 4433 } 4434 UseBiasedLocking = false; 4435 } 4436 4437 #ifdef CC_INTERP 4438 // Clear flags not supported on zero. 4439 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4440 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4441 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4442 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4443 #endif // CC_INTERP 4444 4445 #ifdef COMPILER2 4446 if (!EliminateLocks) { 4447 EliminateNestedLocks = false; 4448 } 4449 if (!Inline) { 4450 IncrementalInline = false; 4451 } 4452 #ifndef PRODUCT 4453 if (!IncrementalInline) { 4454 AlwaysIncrementalInline = false; 4455 } 4456 #endif 4457 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4458 // nothing to use the profiling, turn if off 4459 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4460 } 4461 #endif 4462 4463 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4464 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4465 DebugNonSafepoints = true; 4466 } 4467 4468 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4469 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4470 } 4471 4472 if (UseOnStackReplacement && !UseLoopCounter) { 4473 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4474 FLAG_SET_DEFAULT(UseLoopCounter, true); 4475 } 4476 4477 #ifndef PRODUCT 4478 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4479 if (use_vm_log()) { 4480 LogVMOutput = true; 4481 } 4482 } 4483 #endif // PRODUCT 4484 4485 if (PrintCommandLineFlags) { 4486 CommandLineFlags::printSetFlags(tty); 4487 } 4488 4489 // Apply CPU specific policy for the BiasedLocking 4490 if (UseBiasedLocking) { 4491 if (!VM_Version::use_biased_locking() && 4492 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4493 UseBiasedLocking = false; 4494 } 4495 } 4496 #ifdef COMPILER2 4497 if (!UseBiasedLocking || EmitSync != 0) { 4498 UseOptoBiasInlining = false; 4499 } 4500 #endif 4501 4502 return JNI_OK; 4503 } 4504 4505 jint Arguments::adjust_after_os() { 4506 if (UseNUMA) { 4507 if (UseParallelGC || UseParallelOldGC) { 4508 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4509 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4510 } 4511 } 4512 // UseNUMAInterleaving is set to ON for all collectors and 4513 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4514 // such as the parallel collector for Linux and Solaris will 4515 // interleave old gen and survivor spaces on top of NUMA 4516 // allocation policy for the eden space. 4517 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4518 // all platforms and ParallelGC on Windows will interleave all 4519 // of the heap spaces across NUMA nodes. 4520 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4521 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4522 } 4523 } 4524 return JNI_OK; 4525 } 4526 4527 int Arguments::PropertyList_count(SystemProperty* pl) { 4528 int count = 0; 4529 while(pl != NULL) { 4530 count++; 4531 pl = pl->next(); 4532 } 4533 return count; 4534 } 4535 4536 // Return the number of readable properties. 4537 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4538 int count = 0; 4539 while(pl != NULL) { 4540 if (pl->is_readable()) { 4541 count++; 4542 } 4543 pl = pl->next(); 4544 } 4545 return count; 4546 } 4547 4548 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4549 assert(key != NULL, "just checking"); 4550 SystemProperty* prop; 4551 for (prop = pl; prop != NULL; prop = prop->next()) { 4552 if (strcmp(key, prop->key()) == 0) return prop->value(); 4553 } 4554 return NULL; 4555 } 4556 4557 // Return the value of the requested property provided that it is a readable property. 4558 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4559 assert(key != NULL, "just checking"); 4560 SystemProperty* prop; 4561 // Return the property value if the keys match and the property is not internal or 4562 // it's the special internal property "jdk.boot.class.path.append". 4563 for (prop = pl; prop != NULL; prop = prop->next()) { 4564 if (strcmp(key, prop->key()) == 0) { 4565 if (!prop->internal()) { 4566 return prop->value(); 4567 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4568 return prop->value(); 4569 } else { 4570 // Property is internal and not jdk.boot.class.path.append so return NULL. 4571 return NULL; 4572 } 4573 } 4574 } 4575 return NULL; 4576 } 4577 4578 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4579 int count = 0; 4580 const char* ret_val = NULL; 4581 4582 while(pl != NULL) { 4583 if(count >= index) { 4584 ret_val = pl->key(); 4585 break; 4586 } 4587 count++; 4588 pl = pl->next(); 4589 } 4590 4591 return ret_val; 4592 } 4593 4594 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4595 int count = 0; 4596 char* ret_val = NULL; 4597 4598 while(pl != NULL) { 4599 if(count >= index) { 4600 ret_val = pl->value(); 4601 break; 4602 } 4603 count++; 4604 pl = pl->next(); 4605 } 4606 4607 return ret_val; 4608 } 4609 4610 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4611 SystemProperty* p = *plist; 4612 if (p == NULL) { 4613 *plist = new_p; 4614 } else { 4615 while (p->next() != NULL) { 4616 p = p->next(); 4617 } 4618 p->set_next(new_p); 4619 } 4620 } 4621 4622 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4623 bool writeable, bool internal) { 4624 if (plist == NULL) 4625 return; 4626 4627 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4628 PropertyList_add(plist, new_p); 4629 } 4630 4631 void Arguments::PropertyList_add(SystemProperty *element) { 4632 PropertyList_add(&_system_properties, element); 4633 } 4634 4635 // This add maintains unique property key in the list. 4636 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4637 PropertyAppendable append, PropertyWriteable writeable, 4638 PropertyInternal internal) { 4639 if (plist == NULL) 4640 return; 4641 4642 // If property key exist then update with new value. 4643 SystemProperty* prop; 4644 for (prop = *plist; prop != NULL; prop = prop->next()) { 4645 if (strcmp(k, prop->key()) == 0) { 4646 if (append == AppendProperty) { 4647 prop->append_value(v); 4648 } else { 4649 prop->set_value(v); 4650 } 4651 return; 4652 } 4653 } 4654 4655 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4656 } 4657 4658 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4659 // Returns true if all of the source pointed by src has been copied over to 4660 // the destination buffer pointed by buf. Otherwise, returns false. 4661 // Notes: 4662 // 1. If the length (buflen) of the destination buffer excluding the 4663 // NULL terminator character is not long enough for holding the expanded 4664 // pid characters, it also returns false instead of returning the partially 4665 // expanded one. 4666 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4667 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4668 char* buf, size_t buflen) { 4669 const char* p = src; 4670 char* b = buf; 4671 const char* src_end = &src[srclen]; 4672 char* buf_end = &buf[buflen - 1]; 4673 4674 while (p < src_end && b < buf_end) { 4675 if (*p == '%') { 4676 switch (*(++p)) { 4677 case '%': // "%%" ==> "%" 4678 *b++ = *p++; 4679 break; 4680 case 'p': { // "%p" ==> current process id 4681 // buf_end points to the character before the last character so 4682 // that we could write '\0' to the end of the buffer. 4683 size_t buf_sz = buf_end - b + 1; 4684 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4685 4686 // if jio_snprintf fails or the buffer is not long enough to hold 4687 // the expanded pid, returns false. 4688 if (ret < 0 || ret >= (int)buf_sz) { 4689 return false; 4690 } else { 4691 b += ret; 4692 assert(*b == '\0', "fail in copy_expand_pid"); 4693 if (p == src_end && b == buf_end + 1) { 4694 // reach the end of the buffer. 4695 return true; 4696 } 4697 } 4698 p++; 4699 break; 4700 } 4701 default : 4702 *b++ = '%'; 4703 } 4704 } else { 4705 *b++ = *p++; 4706 } 4707 } 4708 *b = '\0'; 4709 return (p == src_end); // return false if not all of the source was copied 4710 }