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/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/arguments_ext.hpp" 45 #include "runtime/commandLineFlagConstraintList.hpp" 46 #include "runtime/commandLineFlagWriteableList.hpp" 47 #include "runtime/commandLineFlagRangeList.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/globals_extension.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/defaultStream.hpp" 56 #include "utilities/macros.hpp" 57 #include "utilities/stringUtils.hpp" 58 #if INCLUDE_JVMCI 59 #include "jvmci/jvmciRuntime.hpp" 60 #endif 61 #if INCLUDE_ALL_GCS 62 #include "gc/cms/compactibleFreeListSpace.hpp" 63 #include "gc/g1/g1CollectedHeap.inline.hpp" 64 #include "gc/parallel/parallelScavengeHeap.hpp" 65 #endif // INCLUDE_ALL_GCS 66 67 // Note: This is a special bug reporting site for the JVM 68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 bool Arguments::_has_profile = false; 80 size_t Arguments::_conservative_max_heap_alignment = 0; 81 size_t Arguments::_min_heap_size = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 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 bool Arguments::_has_jimage = false; 117 118 char* Arguments::_ext_dirs = NULL; 119 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 121 // part of the option string. 122 static bool match_option(const JavaVMOption *option, const char* name, 123 const char** tail) { 124 size_t len = strlen(name); 125 if (strncmp(option->optionString, name, len) == 0) { 126 *tail = option->optionString + len; 127 return true; 128 } else { 129 return false; 130 } 131 } 132 133 // Check if 'option' matches 'name'. No "tail" is allowed. 134 static bool match_option(const JavaVMOption *option, const char* name) { 135 const char* tail = NULL; 136 bool result = match_option(option, name, &tail); 137 if (tail != NULL && *tail == '\0') { 138 return result; 139 } else { 140 return false; 141 } 142 } 143 144 // Return true if any of the strings in null-terminated array 'names' matches. 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 146 // the option must match exactly. 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 148 bool tail_allowed) { 149 for (/* empty */; *names != NULL; ++names) { 150 if (match_option(option, *names, tail)) { 151 if (**tail == '\0' || tail_allowed && **tail == ':') { 152 return true; 153 } 154 } 155 } 156 return false; 157 } 158 159 static void logOption(const char* opt) { 160 if (PrintVMOptions) { 161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 162 } 163 } 164 165 bool needs_module_property_warning = false; 166 167 #define MODULE_PROPERTY_PREFIX "jdk.module." 168 #define MODULE_PROPERTY_PREFIX_LEN 11 169 #define ADDEXPORTS "addexports" 170 #define ADDEXPORTS_LEN 10 171 #define ADDREADS "addreads" 172 #define ADDREADS_LEN 8 173 #define PATCH "patch" 174 #define PATCH_LEN 5 175 #define ADDMODS "addmods" 176 #define ADDMODS_LEN 7 177 #define LIMITMODS "limitmods" 178 #define LIMITMODS_LEN 9 179 #define PATH "path" 180 #define PATH_LEN 4 181 #define UPGRADE_PATH "upgrade.path" 182 #define UPGRADE_PATH_LEN 12 183 184 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 185 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 186 return ((strncmp(option, property, len) == 0) && 187 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 188 } 189 190 // Return true if property starts with "jdk.module." and its ensuing chars match 191 // any of the reserved module properties. 192 // property should be passed without the leading "-D". 193 bool Arguments::is_internal_module_property(const char* property) { 194 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 195 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 196 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 197 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 198 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 199 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 200 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 201 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 202 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 203 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 204 return true; 205 } 206 } 207 return false; 208 } 209 210 // Process java launcher properties. 211 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 212 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 213 // sun.java.launcher.pid is defined. 214 // Must do this before setting up other system properties, 215 // as some of them may depend on launcher type. 216 for (int index = 0; index < args->nOptions; index++) { 217 const JavaVMOption* option = args->options + index; 218 const char* tail; 219 220 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 221 process_java_launcher_argument(tail, option->extraInfo); 222 continue; 223 } 224 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 225 if (strcmp(tail, "true") == 0) { 226 _sun_java_launcher_is_altjvm = true; 227 } 228 continue; 229 } 230 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 231 _sun_java_launcher_pid = atoi(tail); 232 continue; 233 } 234 } 235 } 236 237 // Initialize system properties key and value. 238 void Arguments::init_system_properties() { 239 240 // Set up _system_boot_class_path which is not a property but 241 // relies heavily on argument processing and the jdk.boot.class.path.append 242 // property. It is used to store the underlying system boot class path. 243 _system_boot_class_path = new PathString(NULL); 244 245 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 246 "Java Virtual Machine Specification", false)); 247 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 250 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 251 252 // Following are JVMTI agent writable properties. 253 // Properties values are set to NULL and they are 254 // os specific they are initialized in os::init_system_properties_values(). 255 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 256 _java_library_path = new SystemProperty("java.library.path", NULL, true); 257 _java_home = new SystemProperty("java.home", NULL, true); 258 _java_class_path = new SystemProperty("java.class.path", "", true); 259 // jdk.boot.class.path.append is a non-writeable, internal property. 260 // It can only be set by either: 261 // - -Xbootclasspath/a: 262 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 263 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 264 265 // Add to System Property list. 266 PropertyList_add(&_system_properties, _sun_boot_library_path); 267 PropertyList_add(&_system_properties, _java_library_path); 268 PropertyList_add(&_system_properties, _java_home); 269 PropertyList_add(&_system_properties, _java_class_path); 270 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 271 272 // Set OS specific system properties values 273 os::init_system_properties_values(); 274 } 275 276 // Update/Initialize System properties after JDK version number is known 277 void Arguments::init_version_specific_system_properties() { 278 enum { bufsz = 16 }; 279 char buffer[bufsz]; 280 const char* spec_vendor = "Oracle Corporation"; 281 uint32_t spec_version = JDK_Version::current().major_version(); 282 283 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 284 285 PropertyList_add(&_system_properties, 286 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 287 PropertyList_add(&_system_properties, 288 new SystemProperty("java.vm.specification.version", buffer, false)); 289 PropertyList_add(&_system_properties, 290 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 291 } 292 293 /* 294 * -XX argument processing: 295 * 296 * -XX arguments are defined in several places, such as: 297 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 298 * -XX arguments are parsed in parse_argument(). 299 * -XX argument bounds checking is done in check_vm_args_consistency(). 300 * 301 * Over time -XX arguments may change. There are mechanisms to handle common cases: 302 * 303 * ALIASED: An option that is simply another name for another option. This is often 304 * part of the process of deprecating a flag, but not all aliases need 305 * to be deprecated. 306 * 307 * Create an alias for an option by adding the old and new option names to the 308 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 309 * 310 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 311 * support may be removed in the future. Both regular and aliased options may be 312 * deprecated. 313 * 314 * Add a deprecation warning for an option (or alias) by adding an entry in the 315 * "special_jvm_flags" table and setting the "deprecated_in" field. 316 * Often an option "deprecated" in one major release will 317 * be made "obsolete" in the next. In this case the entry should also have it's 318 * "obsolete_in" field set. 319 * 320 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 321 * on the command line. A warning is printed to let the user know that option might not 322 * be accepted in the future. 323 * 324 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 325 * table and setting the "obsolete_in" field. 326 * 327 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 328 * to the current JDK version. The system will flatly refuse to admit the existence of 329 * the flag. This allows a flag to die automatically over JDK releases. 330 * 331 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 332 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 333 * - Newly obsolete or expired deprecated options should have their global variable 334 * definitions removed (from globals.hpp, etc) and related implementations removed. 335 * 336 * Recommended approach for removing options: 337 * 338 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 339 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 340 * 341 * To remove internal options (e.g. diagnostic, experimental, develop options), use 342 * a 2-step model adding major release numbers to the obsolete and expire columns. 343 * 344 * To change the name of an option, use the alias table as well as a 2-step 345 * model adding major release numbers to the deprecate and expire columns. 346 * Think twice about aliasing commonly used customer options. 347 * 348 * There are times when it is appropriate to leave a future release number as undefined. 349 * 350 * Tests: Aliases should be tested in VMAliasOptions.java. 351 * Deprecated options should be tested in VMDeprecatedOptions.java. 352 */ 353 354 // Obsolete or deprecated -XX flag. 355 typedef struct { 356 const char* name; 357 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined"). 358 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined"). 359 JDK_Version expired_in; // When the option expires (or "undefined"). 360 } SpecialFlag; 361 362 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 363 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 364 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 365 // the command-line as usual, but will issue a warning. 366 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 367 // the command-line, while issuing a warning and ignoring the flag value. 368 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 369 // existence of the flag. 370 // 371 // MANUAL CLEANUP ON JDK VERSION UPDATES: 372 // This table ensures that the handling of options will update automatically when the JDK 373 // version is incremented, but the source code needs to be cleanup up manually: 374 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 375 // variable should be removed, as well as users of the variable. 376 // - As "deprecated" options age into "obsolete" options, move the entry into the 377 // "Obsolete Flags" section of the table. 378 // - All expired options should be removed from the table. 379 static SpecialFlag const special_jvm_flags[] = { 380 // -------------- Deprecated Flags -------------- 381 // --- Non-alias flags - sorted by obsolete_in then expired_in: 382 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 383 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 384 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 385 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 386 387 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 388 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 389 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 390 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 391 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 392 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 393 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 394 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 395 396 // -------------- Obsolete Flags - sorted by expired_in -------------- 397 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 398 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 399 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 400 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 401 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 402 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 403 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 404 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 405 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 406 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 407 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 408 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 409 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 410 #ifndef ZERO 411 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 412 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 413 #endif // ZERO 414 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 415 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 416 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 417 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 418 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 419 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 420 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 421 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 422 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 423 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 424 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 425 426 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 427 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 428 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 429 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 430 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 431 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 432 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 433 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 434 #endif 435 436 { NULL, JDK_Version(0), JDK_Version(0) } 437 }; 438 439 // Flags that are aliases for other flags. 440 typedef struct { 441 const char* alias_name; 442 const char* real_name; 443 } AliasedFlag; 444 445 static AliasedFlag const aliased_jvm_flags[] = { 446 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 447 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 448 { "CMSMarkStackSize", "MarkStackSize" }, 449 { "G1MarkStackSize", "MarkStackSize" }, 450 { "ParallelMarkingThreads", "ConcGCThreads" }, 451 { "ParallelCMSThreads", "ConcGCThreads" }, 452 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 453 { NULL, NULL} 454 }; 455 456 // NOTE: A compatibility request will be necessary for each alias to be removed. 457 static AliasedLoggingFlag const aliased_logging_flags[] = { 458 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 459 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 460 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 461 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 462 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 463 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 464 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 465 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 466 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 467 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 468 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 469 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 470 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 471 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 472 }; 473 474 #ifndef PRODUCT 475 // These options are removed in jdk9. Remove this code for jdk10. 476 static AliasedFlag const removed_develop_logging_flags[] = { 477 { "TraceClassInitialization", "-Xlog:class+init" }, 478 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 479 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 480 { "TraceItables", "-Xlog:itables=debug" }, 481 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 482 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 483 { "TraceStartupTime", "-Xlog:startuptime" }, 484 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 485 { "PrintVtables", "-Xlog:vtables=debug" }, 486 { "VerboseVerification", "-Xlog:verification" }, 487 { NULL, NULL } 488 }; 489 #endif //PRODUCT 490 491 // Return true if "v" is less than "other", where "other" may be "undefined". 492 static bool version_less_than(JDK_Version v, JDK_Version other) { 493 assert(!v.is_undefined(), "must be defined"); 494 if (!other.is_undefined() && v.compare(other) >= 0) { 495 return false; 496 } else { 497 return true; 498 } 499 } 500 501 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 502 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 503 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 504 flag = special_jvm_flags[i]; 505 return true; 506 } 507 } 508 return false; 509 } 510 511 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 512 assert(version != NULL, "Must provide a version buffer"); 513 SpecialFlag flag; 514 if (lookup_special_flag(flag_name, flag)) { 515 if (!flag.obsolete_in.is_undefined()) { 516 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 517 *version = flag.obsolete_in; 518 return true; 519 } 520 } 521 } 522 return false; 523 } 524 525 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 526 assert(version != NULL, "Must provide a version buffer"); 527 SpecialFlag flag; 528 if (lookup_special_flag(flag_name, flag)) { 529 if (!flag.deprecated_in.is_undefined()) { 530 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 531 version_less_than(JDK_Version::current(), flag.expired_in)) { 532 *version = flag.deprecated_in; 533 return 1; 534 } else { 535 return -1; 536 } 537 } 538 } 539 return 0; 540 } 541 542 #ifndef PRODUCT 543 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 544 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 545 const AliasedFlag& flag = removed_develop_logging_flags[i]; 546 if (strcmp(flag.alias_name, name) == 0) { 547 return flag.real_name; 548 } 549 } 550 return NULL; 551 } 552 #endif // PRODUCT 553 554 const char* Arguments::real_flag_name(const char *flag_name) { 555 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 556 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 557 if (strcmp(flag_status.alias_name, flag_name) == 0) { 558 return flag_status.real_name; 559 } 560 } 561 return flag_name; 562 } 563 564 #ifdef ASSERT 565 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 566 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 567 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 568 return true; 569 } 570 } 571 return false; 572 } 573 574 static bool verify_special_jvm_flags() { 575 bool success = true; 576 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 577 const SpecialFlag& flag = special_jvm_flags[i]; 578 if (lookup_special_flag(flag.name, i)) { 579 warning("Duplicate special flag declaration \"%s\"", flag.name); 580 success = false; 581 } 582 if (flag.deprecated_in.is_undefined() && 583 flag.obsolete_in.is_undefined()) { 584 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 585 success = false; 586 } 587 588 if (!flag.deprecated_in.is_undefined()) { 589 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 590 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 591 success = false; 592 } 593 594 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 595 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 596 success = false; 597 } 598 } 599 600 if (!flag.obsolete_in.is_undefined()) { 601 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 602 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 603 success = false; 604 } 605 606 // if flag has become obsolete it should not have a "globals" flag defined anymore. 607 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 608 if (Flag::find_flag(flag.name) != NULL) { 609 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 610 success = false; 611 } 612 } 613 } 614 615 if (!flag.expired_in.is_undefined()) { 616 // if flag has become expired it should not have a "globals" flag defined anymore. 617 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 618 if (Flag::find_flag(flag.name) != NULL) { 619 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 620 success = false; 621 } 622 } 623 } 624 625 } 626 return success; 627 } 628 #endif 629 630 // Parses a size specification string. 631 bool Arguments::atojulong(const char *s, julong* result) { 632 julong n = 0; 633 634 // First char must be a digit. Don't allow negative numbers or leading spaces. 635 if (!isdigit(*s)) { 636 return false; 637 } 638 639 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 640 char* remainder; 641 errno = 0; 642 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 643 if (errno != 0) { 644 return false; 645 } 646 647 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 648 if (remainder == s || strlen(remainder) > 1) { 649 return false; 650 } 651 652 switch (*remainder) { 653 case 'T': case 't': 654 *result = n * G * K; 655 // Check for overflow. 656 if (*result/((julong)G * K) != n) return false; 657 return true; 658 case 'G': case 'g': 659 *result = n * G; 660 if (*result/G != n) return false; 661 return true; 662 case 'M': case 'm': 663 *result = n * M; 664 if (*result/M != n) return false; 665 return true; 666 case 'K': case 'k': 667 *result = n * K; 668 if (*result/K != n) return false; 669 return true; 670 case '\0': 671 *result = n; 672 return true; 673 default: 674 return false; 675 } 676 } 677 678 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 679 if (size < min_size) return arg_too_small; 680 // Check that size will fit in a size_t (only relevant on 32-bit) 681 if (size > max_uintx) return arg_too_big; 682 return arg_in_range; 683 } 684 685 // Describe an argument out of range error 686 void Arguments::describe_range_error(ArgsRange errcode) { 687 switch(errcode) { 688 case arg_too_big: 689 jio_fprintf(defaultStream::error_stream(), 690 "The specified size exceeds the maximum " 691 "representable size.\n"); 692 break; 693 case arg_too_small: 694 case arg_unreadable: 695 case arg_in_range: 696 // do nothing for now 697 break; 698 default: 699 ShouldNotReachHere(); 700 } 701 } 702 703 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 704 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 705 return true; 706 } else { 707 return false; 708 } 709 } 710 711 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 712 char* end; 713 errno = 0; 714 double v = strtod(value, &end); 715 if ((errno != 0) || (*end != 0)) { 716 return false; 717 } 718 719 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 720 return true; 721 } 722 return false; 723 } 724 725 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 726 julong v; 727 int int_v; 728 intx intx_v; 729 bool is_neg = false; 730 Flag* result = Flag::find_flag(name, strlen(name)); 731 732 if (result == NULL) { 733 return false; 734 } 735 736 // Check the sign first since atojulong() parses only unsigned values. 737 if (*value == '-') { 738 if (!result->is_intx() && !result->is_int()) { 739 return false; 740 } 741 value++; 742 is_neg = true; 743 } 744 if (!Arguments::atojulong(value, &v)) { 745 return false; 746 } 747 if (result->is_int()) { 748 int_v = (int) v; 749 if (is_neg) { 750 int_v = -int_v; 751 } 752 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 753 } else if (result->is_uint()) { 754 uint uint_v = (uint) v; 755 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 756 } else if (result->is_intx()) { 757 intx_v = (intx) v; 758 if (is_neg) { 759 intx_v = -intx_v; 760 } 761 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 762 } else if (result->is_uintx()) { 763 uintx uintx_v = (uintx) v; 764 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 765 } else if (result->is_uint64_t()) { 766 uint64_t uint64_t_v = (uint64_t) v; 767 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 768 } else if (result->is_size_t()) { 769 size_t size_t_v = (size_t) v; 770 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 771 } else { 772 return false; 773 } 774 } 775 776 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 777 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 778 // Contract: CommandLineFlags always returns a pointer that needs freeing. 779 FREE_C_HEAP_ARRAY(char, value); 780 return true; 781 } 782 783 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 784 const char* old_value = ""; 785 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 786 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 787 size_t new_len = strlen(new_value); 788 const char* value; 789 char* free_this_too = NULL; 790 if (old_len == 0) { 791 value = new_value; 792 } else if (new_len == 0) { 793 value = old_value; 794 } else { 795 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtArguments); 796 // each new setting adds another LINE to the switch: 797 sprintf(buf, "%s\n%s", old_value, new_value); 798 value = buf; 799 free_this_too = buf; 800 } 801 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 802 // CommandLineFlags always returns a pointer that needs freeing. 803 FREE_C_HEAP_ARRAY(char, value); 804 if (free_this_too != NULL) { 805 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 806 FREE_C_HEAP_ARRAY(char, free_this_too); 807 } 808 return true; 809 } 810 811 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 812 const char* real_name = real_flag_name(arg); 813 JDK_Version since = JDK_Version(); 814 switch (is_deprecated_flag(arg, &since)) { 815 case -1: 816 return NULL; // obsolete or expired, don't process normally 817 case 0: 818 return real_name; 819 case 1: { 820 if (warn) { 821 char version[256]; 822 since.to_string(version, sizeof(version)); 823 if (real_name != arg) { 824 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 825 arg, version, real_name); 826 } else { 827 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 828 arg, version); 829 } 830 } 831 return real_name; 832 } 833 } 834 ShouldNotReachHere(); 835 return NULL; 836 } 837 838 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 839 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 840 // Set tagset string buffer at max size of 256, large enough for any alias tagset 841 const int max_tagset_size = 256; 842 int max_tagset_len = max_tagset_size - 1; 843 char tagset_buffer[max_tagset_size]; 844 tagset_buffer[0] = '\0'; 845 846 // Write tag-set for aliased logging option, in string list form 847 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 848 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 849 if (i > 0) { 850 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 851 } 852 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 853 } 854 if (!alf.exactMatch) { 855 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 856 } 857 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 858 (on) ? "+" : "-", 859 name, 860 tagset_buffer, 861 (on) ? LogLevel::name(alf.level) : "off"); 862 } 863 864 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 865 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 866 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 867 if (strcmp(alf.alias_name, name) == 0) { 868 log_deprecated_flag(name, on, alf); 869 return alf; 870 } 871 } 872 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 873 return a; 874 } 875 876 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 877 878 // range of acceptable characters spelled out for portability reasons 879 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 880 #define BUFLEN 255 881 char name[BUFLEN+1]; 882 char dummy; 883 const char* real_name; 884 bool warn_if_deprecated = true; 885 886 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 887 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 888 if (alf.alias_name != NULL){ 889 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 890 return true; 891 } 892 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 893 if (real_name == NULL) { 894 return false; 895 } 896 return set_bool_flag(real_name, false, origin); 897 } 898 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 899 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 900 if (alf.alias_name != NULL){ 901 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 902 return true; 903 } 904 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 905 if (real_name == NULL) { 906 return false; 907 } 908 return set_bool_flag(real_name, true, origin); 909 } 910 911 char punct; 912 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 913 const char* value = strchr(arg, '=') + 1; 914 Flag* flag; 915 916 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 917 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 918 if (alf.alias_name != NULL) { 919 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 920 return true; 921 } 922 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 923 if (real_name == NULL) { 924 return false; 925 } 926 flag = Flag::find_flag(real_name); 927 if (flag != NULL && flag->is_ccstr()) { 928 if (flag->ccstr_accumulates()) { 929 return append_to_string_flag(real_name, value, origin); 930 } else { 931 if (value[0] == '\0') { 932 value = NULL; 933 } 934 return set_string_flag(real_name, value, origin); 935 } 936 } else { 937 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 938 } 939 } 940 941 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 942 const char* value = strchr(arg, '=') + 1; 943 // -XX:Foo:=xxx will reset the string flag to the given value. 944 if (value[0] == '\0') { 945 value = NULL; 946 } 947 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 948 if (real_name == NULL) { 949 return false; 950 } 951 return set_string_flag(real_name, value, origin); 952 } 953 954 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 955 #define SIGNED_NUMBER_RANGE "[-0123456789]" 956 #define NUMBER_RANGE "[0123456789eE+-]" 957 char value[BUFLEN + 1]; 958 char value2[BUFLEN + 1]; 959 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 960 // Looks like a floating-point number -- try again with more lenient format string 961 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 962 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 963 if (real_name == NULL) { 964 return false; 965 } 966 return set_fp_numeric_flag(real_name, value, origin); 967 } 968 } 969 970 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 971 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 972 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 973 if (real_name == NULL) { 974 return false; 975 } 976 return set_numeric_flag(real_name, value, origin); 977 } 978 979 return false; 980 } 981 982 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 983 assert(bldarray != NULL, "illegal argument"); 984 985 if (arg == NULL) { 986 return; 987 } 988 989 int new_count = *count + 1; 990 991 // expand the array and add arg to the last element 992 if (*bldarray == NULL) { 993 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 994 } else { 995 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 996 } 997 (*bldarray)[*count] = os::strdup_check_oom(arg); 998 *count = new_count; 999 } 1000 1001 void Arguments::build_jvm_args(const char* arg) { 1002 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1003 } 1004 1005 void Arguments::build_jvm_flags(const char* arg) { 1006 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1007 } 1008 1009 // utility function to return a string that concatenates all 1010 // strings in a given char** array 1011 const char* Arguments::build_resource_string(char** args, int count) { 1012 if (args == NULL || count == 0) { 1013 return NULL; 1014 } 1015 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 1016 for (int i = 1; i < count; i++) { 1017 length += strlen(args[i]) + 1; // add 1 for a space 1018 } 1019 char* s = NEW_RESOURCE_ARRAY(char, length); 1020 strcpy(s, args[0]); 1021 for (int j = 1; j < count; j++) { 1022 strcat(s, " "); 1023 strcat(s, args[j]); 1024 } 1025 return (const char*) s; 1026 } 1027 1028 void Arguments::print_on(outputStream* st) { 1029 st->print_cr("VM Arguments:"); 1030 if (num_jvm_flags() > 0) { 1031 st->print("jvm_flags: "); print_jvm_flags_on(st); 1032 st->cr(); 1033 } 1034 if (num_jvm_args() > 0) { 1035 st->print("jvm_args: "); print_jvm_args_on(st); 1036 st->cr(); 1037 } 1038 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1039 if (_java_class_path != NULL) { 1040 char* path = _java_class_path->value(); 1041 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1042 } 1043 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1044 } 1045 1046 void Arguments::print_summary_on(outputStream* st) { 1047 // Print the command line. Environment variables that are helpful for 1048 // reproducing the problem are written later in the hs_err file. 1049 // flags are from setting file 1050 if (num_jvm_flags() > 0) { 1051 st->print_raw("Settings File: "); 1052 print_jvm_flags_on(st); 1053 st->cr(); 1054 } 1055 // args are the command line and environment variable arguments. 1056 st->print_raw("Command Line: "); 1057 if (num_jvm_args() > 0) { 1058 print_jvm_args_on(st); 1059 } 1060 // this is the classfile and any arguments to the java program 1061 if (java_command() != NULL) { 1062 st->print("%s", java_command()); 1063 } 1064 st->cr(); 1065 } 1066 1067 void Arguments::print_jvm_flags_on(outputStream* st) { 1068 if (_num_jvm_flags > 0) { 1069 for (int i=0; i < _num_jvm_flags; i++) { 1070 st->print("%s ", _jvm_flags_array[i]); 1071 } 1072 } 1073 } 1074 1075 void Arguments::print_jvm_args_on(outputStream* st) { 1076 if (_num_jvm_args > 0) { 1077 for (int i=0; i < _num_jvm_args; i++) { 1078 st->print("%s ", _jvm_args_array[i]); 1079 } 1080 } 1081 } 1082 1083 bool Arguments::process_argument(const char* arg, 1084 jboolean ignore_unrecognized, 1085 Flag::Flags origin) { 1086 JDK_Version since = JDK_Version(); 1087 1088 if (parse_argument(arg, origin)) { 1089 return true; 1090 } 1091 1092 // Determine if the flag has '+', '-', or '=' characters. 1093 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1094 const char* const argname = has_plus_minus ? arg + 1 : arg; 1095 1096 size_t arg_len; 1097 const char* equal_sign = strchr(argname, '='); 1098 if (equal_sign == NULL) { 1099 arg_len = strlen(argname); 1100 } else { 1101 arg_len = equal_sign - argname; 1102 } 1103 1104 // Only make the obsolete check for valid arguments. 1105 if (arg_len <= BUFLEN) { 1106 // Construct a string which consists only of the argument name without '+', '-', or '='. 1107 char stripped_argname[BUFLEN+1]; 1108 strncpy(stripped_argname, argname, arg_len); 1109 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate. 1110 if (is_obsolete_flag(stripped_argname, &since)) { 1111 char version[256]; 1112 since.to_string(version, sizeof(version)); 1113 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1114 return true; 1115 } 1116 #ifndef PRODUCT 1117 else { 1118 const char* replacement; 1119 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1120 log_warning(arguments)("%s has been removed. Please use %s instead.", 1121 stripped_argname, 1122 replacement); 1123 return false; 1124 } 1125 } 1126 #endif //PRODUCT 1127 } 1128 1129 // For locked flags, report a custom error message if available. 1130 // Otherwise, report the standard unrecognized VM option. 1131 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1132 if (found_flag != NULL) { 1133 char locked_message_buf[BUFLEN]; 1134 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1135 if (strlen(locked_message_buf) == 0) { 1136 if (found_flag->is_bool() && !has_plus_minus) { 1137 jio_fprintf(defaultStream::error_stream(), 1138 "Missing +/- setting for VM option '%s'\n", argname); 1139 } else if (!found_flag->is_bool() && has_plus_minus) { 1140 jio_fprintf(defaultStream::error_stream(), 1141 "Unexpected +/- setting in VM option '%s'\n", argname); 1142 } else { 1143 jio_fprintf(defaultStream::error_stream(), 1144 "Improperly specified VM option '%s'\n", argname); 1145 } 1146 } else { 1147 #ifdef PRODUCT 1148 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1149 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1150 if (ignore_unrecognized && mismatched) { 1151 return true; 1152 } 1153 #endif 1154 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1155 } 1156 } else { 1157 if (ignore_unrecognized) { 1158 return true; 1159 } 1160 jio_fprintf(defaultStream::error_stream(), 1161 "Unrecognized VM option '%s'\n", argname); 1162 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1163 if (fuzzy_matched != NULL) { 1164 jio_fprintf(defaultStream::error_stream(), 1165 "Did you mean '%s%s%s'? ", 1166 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1167 fuzzy_matched->_name, 1168 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1169 } 1170 } 1171 1172 // allow for commandline "commenting out" options like -XX:#+Verbose 1173 return arg[0] == '#'; 1174 } 1175 1176 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1177 FILE* stream = fopen(file_name, "rb"); 1178 if (stream == NULL) { 1179 if (should_exist) { 1180 jio_fprintf(defaultStream::error_stream(), 1181 "Could not open settings file %s\n", file_name); 1182 return false; 1183 } else { 1184 return true; 1185 } 1186 } 1187 1188 char token[1024]; 1189 int pos = 0; 1190 1191 bool in_white_space = true; 1192 bool in_comment = false; 1193 bool in_quote = false; 1194 char quote_c = 0; 1195 bool result = true; 1196 1197 int c = getc(stream); 1198 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1199 if (in_white_space) { 1200 if (in_comment) { 1201 if (c == '\n') in_comment = false; 1202 } else { 1203 if (c == '#') in_comment = true; 1204 else if (!isspace(c)) { 1205 in_white_space = false; 1206 token[pos++] = c; 1207 } 1208 } 1209 } else { 1210 if (c == '\n' || (!in_quote && isspace(c))) { 1211 // token ends at newline, or at unquoted whitespace 1212 // this allows a way to include spaces in string-valued options 1213 token[pos] = '\0'; 1214 logOption(token); 1215 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1216 build_jvm_flags(token); 1217 pos = 0; 1218 in_white_space = true; 1219 in_quote = false; 1220 } else if (!in_quote && (c == '\'' || c == '"')) { 1221 in_quote = true; 1222 quote_c = c; 1223 } else if (in_quote && (c == quote_c)) { 1224 in_quote = false; 1225 } else { 1226 token[pos++] = c; 1227 } 1228 } 1229 c = getc(stream); 1230 } 1231 if (pos > 0) { 1232 token[pos] = '\0'; 1233 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1234 build_jvm_flags(token); 1235 } 1236 fclose(stream); 1237 return result; 1238 } 1239 1240 //============================================================================================================= 1241 // Parsing of properties (-D) 1242 1243 const char* Arguments::get_property(const char* key) { 1244 return PropertyList_get_value(system_properties(), key); 1245 } 1246 1247 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1248 const char* eq = strchr(prop, '='); 1249 const char* key; 1250 const char* value = ""; 1251 1252 if (eq == NULL) { 1253 // property doesn't have a value, thus use passed string 1254 key = prop; 1255 } else { 1256 // property have a value, thus extract it and save to the 1257 // allocated string 1258 size_t key_len = eq - prop; 1259 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1260 1261 strncpy(tmp_key, prop, key_len); 1262 tmp_key[key_len] = '\0'; 1263 key = tmp_key; 1264 1265 value = &prop[key_len + 1]; 1266 } 1267 1268 if (strcmp(key, "java.compiler") == 0) { 1269 process_java_compiler_argument(value); 1270 // Record value in Arguments, but let it get passed to Java. 1271 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1272 strcmp(key, "sun.java.launcher.pid") == 0) { 1273 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1274 // private and are processed in process_sun_java_launcher_properties(); 1275 // the sun.java.launcher property is passed on to the java application 1276 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1277 // append is true, writable is true, internal is false 1278 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1279 WriteableProperty, ExternalProperty); 1280 } else { 1281 if (strcmp(key, "sun.java.command") == 0) { 1282 char *old_java_command = _java_command; 1283 _java_command = os::strdup_check_oom(value, mtArguments); 1284 if (old_java_command != NULL) { 1285 os::free(old_java_command); 1286 } 1287 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1288 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1289 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1290 // its value without going through the property list or making a Java call. 1291 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1292 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1293 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1294 os::free((void *)old_java_vendor_url_bug); 1295 } 1296 } 1297 1298 // Create new property and add at the end of the list 1299 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1300 } 1301 1302 if (key != prop) { 1303 // SystemProperty copy passed value, thus free previously allocated 1304 // memory 1305 FreeHeap((void *)key); 1306 } 1307 1308 return true; 1309 } 1310 1311 // sets or adds a module name to the jdk.module.addmods property 1312 bool Arguments::append_to_addmods_property(const char* module_name) { 1313 const char* key = "jdk.module.addmods"; 1314 const char* old_value = Arguments::get_property(key); 1315 size_t buf_len = strlen(key) + strlen(module_name) + 2; 1316 if (old_value != NULL) { 1317 buf_len += strlen(old_value) + 1; 1318 } 1319 char* new_value = AllocateHeap(buf_len, mtArguments); 1320 if (new_value == NULL) { 1321 return false; 1322 } 1323 if (old_value == NULL) { 1324 jio_snprintf(new_value, buf_len, "%s=%s", key, module_name); 1325 } else { 1326 jio_snprintf(new_value, buf_len, "%s=%s,%s", key, old_value, module_name); 1327 } 1328 bool added = add_property(new_value, UnwriteableProperty, InternalProperty); 1329 FreeHeap(new_value); 1330 return added; 1331 } 1332 1333 #if INCLUDE_CDS 1334 void Arguments::check_unsupported_dumping_properties() { 1335 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1336 const char* unsupported_properties[5] = { "jdk.module.main", 1337 "jdk.module.path", 1338 "jdk.module.upgrade.path", 1339 "jdk.module.addmods", 1340 "jdk.module.limitmods" }; 1341 const char* unsupported_options[5] = { "-m", 1342 "--module-path", 1343 "--upgrade-module-path", 1344 "--add-modules", 1345 "--limit-modules" }; 1346 SystemProperty* sp = system_properties(); 1347 while (sp != NULL) { 1348 for (int i = 0; i < 5; i++) { 1349 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1350 vm_exit_during_initialization( 1351 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1352 } 1353 } 1354 sp = sp->next(); 1355 } 1356 1357 // Check for an exploded module build in use with -Xshare:dump. 1358 if (!has_jimage()) { 1359 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1360 } 1361 } 1362 #endif 1363 1364 //=========================================================================================================== 1365 // Setting int/mixed/comp mode flags 1366 1367 void Arguments::set_mode_flags(Mode mode) { 1368 // Set up default values for all flags. 1369 // If you add a flag to any of the branches below, 1370 // add a default value for it here. 1371 set_java_compiler(false); 1372 _mode = mode; 1373 1374 // Ensure Agent_OnLoad has the correct initial values. 1375 // This may not be the final mode; mode may change later in onload phase. 1376 PropertyList_unique_add(&_system_properties, "java.vm.info", 1377 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1378 1379 UseInterpreter = true; 1380 UseCompiler = true; 1381 UseLoopCounter = true; 1382 1383 // Default values may be platform/compiler dependent - 1384 // use the saved values 1385 ClipInlining = Arguments::_ClipInlining; 1386 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1387 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1388 BackgroundCompilation = Arguments::_BackgroundCompilation; 1389 if (TieredCompilation) { 1390 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1391 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1392 } 1393 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1394 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1395 } 1396 } 1397 1398 // Change from defaults based on mode 1399 switch (mode) { 1400 default: 1401 ShouldNotReachHere(); 1402 break; 1403 case _int: 1404 UseCompiler = false; 1405 UseLoopCounter = false; 1406 AlwaysCompileLoopMethods = false; 1407 UseOnStackReplacement = false; 1408 break; 1409 case _mixed: 1410 // same as default 1411 break; 1412 case _comp: 1413 UseInterpreter = false; 1414 BackgroundCompilation = false; 1415 ClipInlining = false; 1416 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1417 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1418 // compile a level 4 (C2) and then continue executing it. 1419 if (TieredCompilation) { 1420 Tier3InvokeNotifyFreqLog = 0; 1421 Tier4InvocationThreshold = 0; 1422 } 1423 break; 1424 } 1425 } 1426 1427 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS 1428 // Conflict: required to use shared spaces (-Xshare:on), but 1429 // incompatible command line options were chosen. 1430 1431 static void no_shared_spaces(const char* message) { 1432 if (RequireSharedSpaces) { 1433 jio_fprintf(defaultStream::error_stream(), 1434 "Class data sharing is inconsistent with other specified options.\n"); 1435 vm_exit_during_initialization("Unable to use shared archive.", message); 1436 } else { 1437 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1438 } 1439 } 1440 #endif 1441 1442 // Returns threshold scaled with the value of scale. 1443 // If scale < 0.0, threshold is returned without scaling. 1444 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1445 if (scale == 1.0 || scale < 0.0) { 1446 return threshold; 1447 } else { 1448 return (intx)(threshold * scale); 1449 } 1450 } 1451 1452 // Returns freq_log scaled with the value of scale. 1453 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1454 // If scale < 0.0, freq_log is returned without scaling. 1455 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1456 // Check if scaling is necessary or if negative value was specified. 1457 if (scale == 1.0 || scale < 0.0) { 1458 return freq_log; 1459 } 1460 // Check values to avoid calculating log2 of 0. 1461 if (scale == 0.0 || freq_log == 0) { 1462 return 0; 1463 } 1464 // Determine the maximum notification frequency value currently supported. 1465 // The largest mask value that the interpreter/C1 can handle is 1466 // of length InvocationCounter::number_of_count_bits. Mask values are always 1467 // one bit shorter then the value of the notification frequency. Set 1468 // max_freq_bits accordingly. 1469 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1470 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1471 if (scaled_freq == 0) { 1472 // Return 0 right away to avoid calculating log2 of 0. 1473 return 0; 1474 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1475 return max_freq_bits; 1476 } else { 1477 return log2_intptr(scaled_freq); 1478 } 1479 } 1480 1481 void Arguments::set_tiered_flags() { 1482 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1483 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1484 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1485 } 1486 if (CompilationPolicyChoice < 2) { 1487 vm_exit_during_initialization( 1488 "Incompatible compilation policy selected", NULL); 1489 } 1490 // Increase the code cache size - tiered compiles a lot more. 1491 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1492 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1493 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1494 } 1495 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1496 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1497 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1498 } 1499 if (!UseInterpreter) { // -Xcomp 1500 Tier3InvokeNotifyFreqLog = 0; 1501 Tier4InvocationThreshold = 0; 1502 } 1503 1504 if (CompileThresholdScaling < 0) { 1505 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1506 } 1507 1508 // Scale tiered compilation thresholds. 1509 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1510 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1511 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1512 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1513 1514 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1515 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1516 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1517 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1518 1519 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1520 // once these thresholds become supported. 1521 1522 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1523 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1524 1525 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1526 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1527 1528 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1529 1530 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1531 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1532 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1533 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1534 } 1535 } 1536 1537 #if INCLUDE_ALL_GCS 1538 static void disable_adaptive_size_policy(const char* collector_name) { 1539 if (UseAdaptiveSizePolicy) { 1540 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1541 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1542 collector_name); 1543 } 1544 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1545 } 1546 } 1547 1548 void Arguments::set_parnew_gc_flags() { 1549 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1550 "control point invariant"); 1551 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1552 assert(UseParNewGC, "ParNew should always be used with CMS"); 1553 1554 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1555 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1556 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1557 } else if (ParallelGCThreads == 0) { 1558 jio_fprintf(defaultStream::error_stream(), 1559 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1560 vm_exit(1); 1561 } 1562 1563 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1564 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1565 // we set them to 1024 and 1024. 1566 // See CR 6362902. 1567 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1568 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1569 } 1570 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1571 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1572 } 1573 1574 // When using compressed oops, we use local overflow stacks, 1575 // rather than using a global overflow list chained through 1576 // the klass word of the object's pre-image. 1577 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1578 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1579 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1580 } 1581 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1582 } 1583 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1584 } 1585 1586 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1587 // sparc/solaris for certain applications, but would gain from 1588 // further optimization and tuning efforts, and would almost 1589 // certainly gain from analysis of platform and environment. 1590 void Arguments::set_cms_and_parnew_gc_flags() { 1591 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1592 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1593 assert(UseParNewGC, "ParNew should always be used with CMS"); 1594 1595 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1596 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1597 1598 set_parnew_gc_flags(); 1599 1600 size_t max_heap = align_size_down(MaxHeapSize, 1601 CardTableRS::ct_max_alignment_constraint()); 1602 1603 // Now make adjustments for CMS 1604 intx tenuring_default = (intx)6; 1605 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1606 1607 // Preferred young gen size for "short" pauses: 1608 // upper bound depends on # of threads and NewRatio. 1609 const size_t preferred_max_new_size_unaligned = 1610 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1611 size_t preferred_max_new_size = 1612 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1613 1614 // Unless explicitly requested otherwise, size young gen 1615 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1616 1617 // If either MaxNewSize or NewRatio is set on the command line, 1618 // assume the user is trying to set the size of the young gen. 1619 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1620 1621 // Set MaxNewSize to our calculated preferred_max_new_size unless 1622 // NewSize was set on the command line and it is larger than 1623 // preferred_max_new_size. 1624 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1625 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1626 } else { 1627 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1628 } 1629 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1630 1631 // Code along this path potentially sets NewSize and OldSize 1632 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1633 min_heap_size(), InitialHeapSize, max_heap); 1634 size_t min_new = preferred_max_new_size; 1635 if (FLAG_IS_CMDLINE(NewSize)) { 1636 min_new = NewSize; 1637 } 1638 if (max_heap > min_new && min_heap_size() > min_new) { 1639 // Unless explicitly requested otherwise, make young gen 1640 // at least min_new, and at most preferred_max_new_size. 1641 if (FLAG_IS_DEFAULT(NewSize)) { 1642 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1643 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1644 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1645 } 1646 // Unless explicitly requested otherwise, size old gen 1647 // so it's NewRatio x of NewSize. 1648 if (FLAG_IS_DEFAULT(OldSize)) { 1649 if (max_heap > NewSize) { 1650 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1651 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1652 } 1653 } 1654 } 1655 } 1656 // Unless explicitly requested otherwise, definitely 1657 // promote all objects surviving "tenuring_default" scavenges. 1658 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1659 FLAG_IS_DEFAULT(SurvivorRatio)) { 1660 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1661 } 1662 // If we decided above (or user explicitly requested) 1663 // `promote all' (via MaxTenuringThreshold := 0), 1664 // prefer minuscule survivor spaces so as not to waste 1665 // space for (non-existent) survivors 1666 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1667 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1668 } 1669 1670 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1671 // but rather the number of free blocks of a given size that are used when 1672 // replenishing the local per-worker free list caches. 1673 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1674 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1675 // OldPLAB sizing manually turned off: Use a larger default setting, 1676 // unless it was manually specified. This is because a too-low value 1677 // will slow down scavenges. 1678 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1679 } else { 1680 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1681 } 1682 } 1683 1684 // If either of the static initialization defaults have changed, note this 1685 // modification. 1686 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1687 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1688 } 1689 1690 if (!ClassUnloading) { 1691 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1692 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1693 } 1694 1695 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1696 } 1697 #endif // INCLUDE_ALL_GCS 1698 1699 void set_object_alignment() { 1700 // Object alignment. 1701 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1702 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1703 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1704 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1705 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1706 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1707 1708 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1709 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1710 1711 // Oop encoding heap max 1712 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1713 1714 if (SurvivorAlignmentInBytes == 0) { 1715 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1716 } 1717 1718 #if INCLUDE_ALL_GCS 1719 // Set CMS global values 1720 CompactibleFreeListSpace::set_cms_values(); 1721 #endif // INCLUDE_ALL_GCS 1722 } 1723 1724 size_t Arguments::max_heap_for_compressed_oops() { 1725 // Avoid sign flip. 1726 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1727 // We need to fit both the NULL page and the heap into the memory budget, while 1728 // keeping alignment constraints of the heap. To guarantee the latter, as the 1729 // NULL page is located before the heap, we pad the NULL page to the conservative 1730 // maximum alignment that the GC may ever impose upon the heap. 1731 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1732 _conservative_max_heap_alignment); 1733 1734 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1735 NOT_LP64(ShouldNotReachHere(); return 0); 1736 } 1737 1738 bool Arguments::should_auto_select_low_pause_collector() { 1739 if (UseAutoGCSelectPolicy && 1740 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1741 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1742 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1743 return true; 1744 } 1745 return false; 1746 } 1747 1748 void Arguments::set_use_compressed_oops() { 1749 #ifndef ZERO 1750 #ifdef _LP64 1751 // MaxHeapSize is not set up properly at this point, but 1752 // the only value that can override MaxHeapSize if we are 1753 // to use UseCompressedOops is InitialHeapSize. 1754 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1755 1756 if (max_heap_size <= max_heap_for_compressed_oops()) { 1757 #if !defined(COMPILER1) || defined(TIERED) 1758 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1759 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1760 } 1761 #endif 1762 } else { 1763 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1764 warning("Max heap size too large for Compressed Oops"); 1765 FLAG_SET_DEFAULT(UseCompressedOops, false); 1766 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1767 } 1768 } 1769 #endif // _LP64 1770 #endif // ZERO 1771 } 1772 1773 1774 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1775 // set_use_compressed_oops(). 1776 void Arguments::set_use_compressed_klass_ptrs() { 1777 #ifndef ZERO 1778 #ifdef _LP64 1779 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1780 if (!UseCompressedOops) { 1781 if (UseCompressedClassPointers) { 1782 warning("UseCompressedClassPointers requires UseCompressedOops"); 1783 } 1784 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1785 } else { 1786 // Turn on UseCompressedClassPointers too 1787 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1788 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1789 } 1790 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1791 if (UseCompressedClassPointers) { 1792 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1793 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1794 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1795 } 1796 } 1797 } 1798 #endif // _LP64 1799 #endif // !ZERO 1800 } 1801 1802 void Arguments::set_conservative_max_heap_alignment() { 1803 // The conservative maximum required alignment for the heap is the maximum of 1804 // the alignments imposed by several sources: any requirements from the heap 1805 // itself, the collector policy and the maximum page size we may run the VM 1806 // with. 1807 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1808 #if INCLUDE_ALL_GCS 1809 if (UseParallelGC) { 1810 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1811 } else if (UseG1GC) { 1812 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1813 } 1814 #endif // INCLUDE_ALL_GCS 1815 _conservative_max_heap_alignment = MAX4(heap_alignment, 1816 (size_t)os::vm_allocation_granularity(), 1817 os::max_page_size(), 1818 CollectorPolicy::compute_heap_alignment()); 1819 } 1820 1821 bool Arguments::gc_selected() { 1822 #if INCLUDE_ALL_GCS 1823 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1824 #else 1825 return UseSerialGC; 1826 #endif // INCLUDE_ALL_GCS 1827 } 1828 1829 void Arguments::select_gc_ergonomically() { 1830 #if INCLUDE_ALL_GCS 1831 if (os::is_server_class_machine()) { 1832 if (should_auto_select_low_pause_collector()) { 1833 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true); 1834 } else { 1835 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1836 } 1837 } else { 1838 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1839 } 1840 #else 1841 UNSUPPORTED_OPTION(UseG1GC); 1842 UNSUPPORTED_OPTION(UseParallelGC); 1843 UNSUPPORTED_OPTION(UseParallelOldGC); 1844 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1845 UNSUPPORTED_OPTION(UseParNewGC); 1846 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1847 #endif // INCLUDE_ALL_GCS 1848 } 1849 1850 void Arguments::select_gc() { 1851 if (!gc_selected()) { 1852 select_gc_ergonomically(); 1853 if (!gc_selected()) { 1854 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1855 } 1856 } 1857 } 1858 1859 void Arguments::set_ergonomics_flags() { 1860 select_gc(); 1861 1862 #if defined(COMPILER2) || INCLUDE_JVMCI 1863 // Shared spaces work fine with other GCs but causes bytecode rewriting 1864 // to be disabled, which hurts interpreter performance and decreases 1865 // server performance. When -server is specified, keep the default off 1866 // unless it is asked for. Future work: either add bytecode rewriting 1867 // at link time, or rewrite bytecodes in non-shared methods. 1868 if (!DumpSharedSpaces && !RequireSharedSpaces && 1869 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1870 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1871 } 1872 #endif 1873 1874 set_conservative_max_heap_alignment(); 1875 1876 #ifndef ZERO 1877 #ifdef _LP64 1878 set_use_compressed_oops(); 1879 1880 // set_use_compressed_klass_ptrs() must be called after calling 1881 // set_use_compressed_oops(). 1882 set_use_compressed_klass_ptrs(); 1883 1884 // Also checks that certain machines are slower with compressed oops 1885 // in vm_version initialization code. 1886 #endif // _LP64 1887 #endif // !ZERO 1888 1889 CodeCacheExtensions::set_ergonomics_flags(); 1890 } 1891 1892 void Arguments::set_parallel_gc_flags() { 1893 assert(UseParallelGC || UseParallelOldGC, "Error"); 1894 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1895 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1896 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1897 } 1898 FLAG_SET_DEFAULT(UseParallelGC, true); 1899 1900 // If no heap maximum was requested explicitly, use some reasonable fraction 1901 // of the physical memory, up to a maximum of 1GB. 1902 FLAG_SET_DEFAULT(ParallelGCThreads, 1903 Abstract_VM_Version::parallel_worker_threads()); 1904 if (ParallelGCThreads == 0) { 1905 jio_fprintf(defaultStream::error_stream(), 1906 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1907 vm_exit(1); 1908 } 1909 1910 if (UseAdaptiveSizePolicy) { 1911 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1912 // unless the user actually sets these flags. 1913 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1914 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1915 } 1916 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1917 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1918 } 1919 } 1920 1921 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1922 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1923 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1924 // See CR 6362902 for details. 1925 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1926 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1927 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1928 } 1929 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1930 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1931 } 1932 } 1933 1934 if (UseParallelOldGC) { 1935 // Par compact uses lower default values since they are treated as 1936 // minimums. These are different defaults because of the different 1937 // interpretation and are not ergonomically set. 1938 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1939 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1940 } 1941 } 1942 } 1943 1944 void Arguments::set_g1_gc_flags() { 1945 assert(UseG1GC, "Error"); 1946 #if defined(COMPILER1) || INCLUDE_JVMCI 1947 FastTLABRefill = false; 1948 #endif 1949 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1950 if (ParallelGCThreads == 0) { 1951 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1952 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1953 } 1954 1955 #if INCLUDE_ALL_GCS 1956 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1957 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1958 } 1959 #endif 1960 1961 // MarkStackSize will be set (if it hasn't been set by the user) 1962 // when concurrent marking is initialized. 1963 // Its value will be based upon the number of parallel marking threads. 1964 // But we do set the maximum mark stack size here. 1965 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1966 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1967 } 1968 1969 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1970 // In G1, we want the default GC overhead goal to be higher than 1971 // it is for PS, or the heap might be expanded too aggressively. 1972 // We set it here to ~8%. 1973 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1974 } 1975 1976 // Below, we might need to calculate the pause time interval based on 1977 // the pause target. When we do so we are going to give G1 maximum 1978 // flexibility and allow it to do pauses when it needs to. So, we'll 1979 // arrange that the pause interval to be pause time target + 1 to 1980 // ensure that a) the pause time target is maximized with respect to 1981 // the pause interval and b) we maintain the invariant that pause 1982 // time target < pause interval. If the user does not want this 1983 // maximum flexibility, they will have to set the pause interval 1984 // explicitly. 1985 1986 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1987 // The default pause time target in G1 is 200ms 1988 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1989 } 1990 1991 // Then, if the interval parameter was not set, set it according to 1992 // the pause time target (this will also deal with the case when the 1993 // pause time target is the default value). 1994 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1995 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1996 } 1997 1998 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1999 } 2000 2001 void Arguments::set_gc_specific_flags() { 2002 #if INCLUDE_ALL_GCS 2003 // Set per-collector flags 2004 if (UseParallelGC || UseParallelOldGC) { 2005 set_parallel_gc_flags(); 2006 } else if (UseConcMarkSweepGC) { 2007 set_cms_and_parnew_gc_flags(); 2008 } else if (UseG1GC) { 2009 set_g1_gc_flags(); 2010 } 2011 if (AssumeMP && !UseSerialGC) { 2012 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2013 warning("If the number of processors is expected to increase from one, then" 2014 " you should configure the number of parallel GC threads appropriately" 2015 " using -XX:ParallelGCThreads=N"); 2016 } 2017 } 2018 if (MinHeapFreeRatio == 100) { 2019 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2020 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2021 } 2022 #endif // INCLUDE_ALL_GCS 2023 } 2024 2025 julong Arguments::limit_by_allocatable_memory(julong limit) { 2026 julong max_allocatable; 2027 julong result = limit; 2028 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2029 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2030 } 2031 return result; 2032 } 2033 2034 // Use static initialization to get the default before parsing 2035 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2036 2037 void Arguments::set_heap_size() { 2038 const julong phys_mem = 2039 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2040 : (julong)MaxRAM; 2041 2042 // If the maximum heap size has not been set with -Xmx, 2043 // then set it as fraction of the size of physical memory, 2044 // respecting the maximum and minimum sizes of the heap. 2045 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2046 julong reasonable_max = phys_mem / MaxRAMFraction; 2047 2048 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2049 // Small physical memory, so use a minimum fraction of it for the heap 2050 reasonable_max = phys_mem / MinRAMFraction; 2051 } else { 2052 // Not-small physical memory, so require a heap at least 2053 // as large as MaxHeapSize 2054 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2055 } 2056 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2057 // Limit the heap size to ErgoHeapSizeLimit 2058 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2059 } 2060 if (UseCompressedOops) { 2061 // Limit the heap size to the maximum possible when using compressed oops 2062 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2063 2064 // HeapBaseMinAddress can be greater than default but not less than. 2065 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2066 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2067 // matches compressed oops printing flags 2068 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2069 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2070 DefaultHeapBaseMinAddress, 2071 DefaultHeapBaseMinAddress/G, 2072 HeapBaseMinAddress); 2073 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2074 } 2075 } 2076 2077 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2078 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2079 // but it should be not less than default MaxHeapSize. 2080 max_coop_heap -= HeapBaseMinAddress; 2081 } 2082 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2083 } 2084 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2085 2086 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2087 // An initial heap size was specified on the command line, 2088 // so be sure that the maximum size is consistent. Done 2089 // after call to limit_by_allocatable_memory because that 2090 // method might reduce the allocation size. 2091 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2092 } 2093 2094 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2095 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2096 } 2097 2098 // If the minimum or initial heap_size have not been set or requested to be set 2099 // ergonomically, set them accordingly. 2100 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2101 julong reasonable_minimum = (julong)(OldSize + NewSize); 2102 2103 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2104 2105 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2106 2107 if (InitialHeapSize == 0) { 2108 julong reasonable_initial = phys_mem / InitialRAMFraction; 2109 2110 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2111 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2112 2113 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2114 2115 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2116 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2117 } 2118 // If the minimum heap size has not been set (via -Xms), 2119 // synchronize with InitialHeapSize to avoid errors with the default value. 2120 if (min_heap_size() == 0) { 2121 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2122 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2123 } 2124 } 2125 } 2126 2127 // This option inspects the machine and attempts to set various 2128 // parameters to be optimal for long-running, memory allocation 2129 // intensive jobs. It is intended for machines with large 2130 // amounts of cpu and memory. 2131 jint Arguments::set_aggressive_heap_flags() { 2132 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2133 // VM, but we may not be able to represent the total physical memory 2134 // available (like having 8gb of memory on a box but using a 32bit VM). 2135 // Thus, we need to make sure we're using a julong for intermediate 2136 // calculations. 2137 julong initHeapSize; 2138 julong total_memory = os::physical_memory(); 2139 2140 if (total_memory < (julong) 256 * M) { 2141 jio_fprintf(defaultStream::error_stream(), 2142 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2143 vm_exit(1); 2144 } 2145 2146 // The heap size is half of available memory, or (at most) 2147 // all of possible memory less 160mb (leaving room for the OS 2148 // when using ISM). This is the maximum; because adaptive sizing 2149 // is turned on below, the actual space used may be smaller. 2150 2151 initHeapSize = MIN2(total_memory / (julong) 2, 2152 total_memory - (julong) 160 * M); 2153 2154 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2155 2156 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2157 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2158 return JNI_EINVAL; 2159 } 2160 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2161 return JNI_EINVAL; 2162 } 2163 // Currently the minimum size and the initial heap sizes are the same. 2164 set_min_heap_size(initHeapSize); 2165 } 2166 if (FLAG_IS_DEFAULT(NewSize)) { 2167 // Make the young generation 3/8ths of the total heap. 2168 if (FLAG_SET_CMDLINE(size_t, NewSize, 2169 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2170 return JNI_EINVAL; 2171 } 2172 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2173 return JNI_EINVAL; 2174 } 2175 } 2176 2177 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2178 FLAG_SET_DEFAULT(UseLargePages, true); 2179 #endif 2180 2181 // Increase some data structure sizes for efficiency 2182 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2183 return JNI_EINVAL; 2184 } 2185 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2186 return JNI_EINVAL; 2187 } 2188 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2189 return JNI_EINVAL; 2190 } 2191 2192 // See the OldPLABSize comment below, but replace 'after promotion' 2193 // with 'after copying'. YoungPLABSize is the size of the survivor 2194 // space per-gc-thread buffers. The default is 4kw. 2195 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2196 return JNI_EINVAL; 2197 } 2198 2199 // OldPLABSize is the size of the buffers in the old gen that 2200 // UseParallelGC uses to promote live data that doesn't fit in the 2201 // survivor spaces. At any given time, there's one for each gc thread. 2202 // The default size is 1kw. These buffers are rarely used, since the 2203 // survivor spaces are usually big enough. For specjbb, however, there 2204 // are occasions when there's lots of live data in the young gen 2205 // and we end up promoting some of it. We don't have a definite 2206 // explanation for why bumping OldPLABSize helps, but the theory 2207 // is that a bigger PLAB results in retaining something like the 2208 // original allocation order after promotion, which improves mutator 2209 // locality. A minor effect may be that larger PLABs reduce the 2210 // number of PLAB allocation events during gc. The value of 8kw 2211 // was arrived at by experimenting with specjbb. 2212 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2213 return JNI_EINVAL; 2214 } 2215 2216 // Enable parallel GC and adaptive generation sizing 2217 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2218 return JNI_EINVAL; 2219 } 2220 FLAG_SET_DEFAULT(ParallelGCThreads, 2221 Abstract_VM_Version::parallel_worker_threads()); 2222 2223 // Encourage steady state memory management 2224 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2225 return JNI_EINVAL; 2226 } 2227 2228 // This appears to improve mutator locality 2229 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2230 return JNI_EINVAL; 2231 } 2232 2233 // Get around early Solaris scheduling bug 2234 // (affinity vs other jobs on system) 2235 // but disallow DR and offlining (5008695). 2236 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2237 return JNI_EINVAL; 2238 } 2239 2240 return JNI_OK; 2241 } 2242 2243 // This must be called after ergonomics. 2244 void Arguments::set_bytecode_flags() { 2245 if (!RewriteBytecodes) { 2246 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2247 } 2248 } 2249 2250 // Aggressive optimization flags -XX:+AggressiveOpts 2251 jint Arguments::set_aggressive_opts_flags() { 2252 #ifdef COMPILER2 2253 if (AggressiveUnboxing) { 2254 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2255 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2256 } else if (!EliminateAutoBox) { 2257 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2258 AggressiveUnboxing = false; 2259 } 2260 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2261 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2262 } else if (!DoEscapeAnalysis) { 2263 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2264 AggressiveUnboxing = false; 2265 } 2266 } 2267 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2268 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2269 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2270 } 2271 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2272 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2273 } 2274 2275 // Feed the cache size setting into the JDK 2276 char buffer[1024]; 2277 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2278 if (!add_property(buffer)) { 2279 return JNI_ENOMEM; 2280 } 2281 } 2282 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2283 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2284 } 2285 #endif 2286 2287 if (AggressiveOpts) { 2288 // Sample flag setting code 2289 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2290 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2291 // } 2292 } 2293 2294 return JNI_OK; 2295 } 2296 2297 //=========================================================================================================== 2298 // Parsing of java.compiler property 2299 2300 void Arguments::process_java_compiler_argument(const char* arg) { 2301 // For backwards compatibility, Djava.compiler=NONE or "" 2302 // causes us to switch to -Xint mode UNLESS -Xdebug 2303 // is also specified. 2304 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2305 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2306 } 2307 } 2308 2309 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2310 _sun_java_launcher = os::strdup_check_oom(launcher); 2311 } 2312 2313 bool Arguments::created_by_java_launcher() { 2314 assert(_sun_java_launcher != NULL, "property must have value"); 2315 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2316 } 2317 2318 bool Arguments::sun_java_launcher_is_altjvm() { 2319 return _sun_java_launcher_is_altjvm; 2320 } 2321 2322 //=========================================================================================================== 2323 // Parsing of main arguments 2324 2325 #if INCLUDE_JVMCI 2326 // Check consistency of jvmci vm argument settings. 2327 bool Arguments::check_jvmci_args_consistency() { 2328 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2329 } 2330 #endif //INCLUDE_JVMCI 2331 2332 // Check consistency of GC selection 2333 bool Arguments::check_gc_consistency() { 2334 // Ensure that the user has not selected conflicting sets 2335 // of collectors. 2336 uint i = 0; 2337 if (UseSerialGC) i++; 2338 if (UseConcMarkSweepGC) i++; 2339 if (UseParallelGC || UseParallelOldGC) i++; 2340 if (UseG1GC) i++; 2341 if (i > 1) { 2342 jio_fprintf(defaultStream::error_stream(), 2343 "Conflicting collector combinations in option list; " 2344 "please refer to the release notes for the combinations " 2345 "allowed\n"); 2346 return false; 2347 } 2348 2349 if (UseConcMarkSweepGC && !UseParNewGC) { 2350 jio_fprintf(defaultStream::error_stream(), 2351 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2352 return false; 2353 } 2354 2355 if (UseParNewGC && !UseConcMarkSweepGC) { 2356 jio_fprintf(defaultStream::error_stream(), 2357 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2358 return false; 2359 } 2360 2361 return true; 2362 } 2363 2364 // Check the consistency of vm_init_args 2365 bool Arguments::check_vm_args_consistency() { 2366 // Method for adding checks for flag consistency. 2367 // The intent is to warn the user of all possible conflicts, 2368 // before returning an error. 2369 // Note: Needs platform-dependent factoring. 2370 bool status = true; 2371 2372 if (TLABRefillWasteFraction == 0) { 2373 jio_fprintf(defaultStream::error_stream(), 2374 "TLABRefillWasteFraction should be a denominator, " 2375 "not " SIZE_FORMAT "\n", 2376 TLABRefillWasteFraction); 2377 status = false; 2378 } 2379 2380 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2381 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2382 } 2383 2384 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2385 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2386 } 2387 2388 if (GCTimeLimit == 100) { 2389 // Turn off gc-overhead-limit-exceeded checks 2390 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2391 } 2392 2393 status = status && check_gc_consistency(); 2394 2395 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2396 // insists that we hold the requisite locks so that the iteration is 2397 // MT-safe. For the verification at start-up and shut-down, we don't 2398 // yet have a good way of acquiring and releasing these locks, 2399 // which are not visible at the CollectedHeap level. We want to 2400 // be able to acquire these locks and then do the iteration rather 2401 // than just disable the lock verification. This will be fixed under 2402 // bug 4788986. 2403 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2404 if (VerifyDuringStartup) { 2405 warning("Heap verification at start-up disabled " 2406 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2407 VerifyDuringStartup = false; // Disable verification at start-up 2408 } 2409 2410 if (VerifyBeforeExit) { 2411 warning("Heap verification at shutdown disabled " 2412 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2413 VerifyBeforeExit = false; // Disable verification at shutdown 2414 } 2415 } 2416 2417 if (PrintNMTStatistics) { 2418 #if INCLUDE_NMT 2419 if (MemTracker::tracking_level() == NMT_off) { 2420 #endif // INCLUDE_NMT 2421 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2422 PrintNMTStatistics = false; 2423 #if INCLUDE_NMT 2424 } 2425 #endif 2426 } 2427 #if INCLUDE_JVMCI 2428 2429 status = status && check_jvmci_args_consistency(); 2430 2431 if (EnableJVMCI) { 2432 if (!ScavengeRootsInCode) { 2433 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2434 ScavengeRootsInCode = 1; 2435 } 2436 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2437 TypeProfileLevel = 0; 2438 } 2439 if (UseJVMCICompiler) { 2440 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2441 TypeProfileWidth = 8; 2442 } 2443 } 2444 } 2445 #endif 2446 2447 // Check lower bounds of the code cache 2448 // Template Interpreter code is approximately 3X larger in debug builds. 2449 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2450 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2451 jio_fprintf(defaultStream::error_stream(), 2452 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2453 os::vm_page_size()/K); 2454 status = false; 2455 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2456 jio_fprintf(defaultStream::error_stream(), 2457 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2458 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2459 status = false; 2460 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2461 jio_fprintf(defaultStream::error_stream(), 2462 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2463 min_code_cache_size/K); 2464 status = false; 2465 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2466 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2467 jio_fprintf(defaultStream::error_stream(), 2468 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2469 CODE_CACHE_SIZE_LIMIT/M); 2470 status = false; 2471 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2472 jio_fprintf(defaultStream::error_stream(), 2473 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2474 min_code_cache_size/K); 2475 status = false; 2476 } 2477 2478 #ifdef _LP64 2479 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2480 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2481 } 2482 #endif 2483 2484 #ifndef SUPPORT_RESERVED_STACK_AREA 2485 if (StackReservedPages != 0) { 2486 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2487 warning("Reserved Stack Area not supported on this platform"); 2488 } 2489 #endif 2490 2491 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2492 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2493 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2494 } 2495 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2496 } 2497 if (UseCompiler && is_interpreter_only()) { 2498 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2499 warning("UseCompiler disabled due to -Xint."); 2500 } 2501 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2502 } 2503 #ifdef COMPILER2 2504 if (PostLoopMultiversioning && !RangeCheckElimination) { 2505 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2506 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2507 } 2508 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2509 } 2510 #endif 2511 return status; 2512 } 2513 2514 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2515 const char* option_type) { 2516 if (ignore) return false; 2517 2518 const char* spacer = " "; 2519 if (option_type == NULL) { 2520 option_type = ++spacer; // Set both to the empty string. 2521 } 2522 2523 if (os::obsolete_option(option)) { 2524 jio_fprintf(defaultStream::error_stream(), 2525 "Obsolete %s%soption: %s\n", option_type, spacer, 2526 option->optionString); 2527 return false; 2528 } else { 2529 jio_fprintf(defaultStream::error_stream(), 2530 "Unrecognized %s%soption: %s\n", option_type, spacer, 2531 option->optionString); 2532 return true; 2533 } 2534 } 2535 2536 static const char* user_assertion_options[] = { 2537 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2538 }; 2539 2540 static const char* system_assertion_options[] = { 2541 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2542 }; 2543 2544 bool Arguments::parse_uintx(const char* value, 2545 uintx* uintx_arg, 2546 uintx min_size) { 2547 2548 // Check the sign first since atojulong() parses only unsigned values. 2549 bool value_is_positive = !(*value == '-'); 2550 2551 if (value_is_positive) { 2552 julong n; 2553 bool good_return = atojulong(value, &n); 2554 if (good_return) { 2555 bool above_minimum = n >= min_size; 2556 bool value_is_too_large = n > max_uintx; 2557 2558 if (above_minimum && !value_is_too_large) { 2559 *uintx_arg = n; 2560 return true; 2561 } 2562 } 2563 } 2564 return false; 2565 } 2566 2567 unsigned int addreads_count = 0; 2568 unsigned int addexports_count = 0; 2569 unsigned int patch_mod_count = 0; 2570 const char* add_modules_value = NULL; 2571 2572 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2573 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2574 char* property = AllocateHeap(prop_len, mtArguments); 2575 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2576 if (ret < 0 || ret >= (int)prop_len) { 2577 FreeHeap(property); 2578 return false; 2579 } 2580 bool added = add_property(property, UnwriteableProperty, internal); 2581 FreeHeap(property); 2582 return added; 2583 } 2584 2585 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2586 // Make sure count is < 1,000. Otherwise, memory allocation will be too small. 2587 if (count < 1000) { 2588 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5; 2589 char* property = AllocateHeap(prop_len, mtArguments); 2590 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2591 if (ret < 0 || ret >= (int)prop_len) { 2592 FreeHeap(property); 2593 return false; 2594 } 2595 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2596 FreeHeap(property); 2597 return added; 2598 } 2599 return false; 2600 } 2601 2602 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2603 julong* long_arg, 2604 julong min_size) { 2605 if (!atojulong(s, long_arg)) return arg_unreadable; 2606 return check_memory_size(*long_arg, min_size); 2607 } 2608 2609 // Parse JavaVMInitArgs structure 2610 2611 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2612 const JavaVMInitArgs *java_options_args, 2613 const JavaVMInitArgs *cmd_line_args) { 2614 bool patch_mod_javabase = false; 2615 2616 // Save default settings for some mode flags 2617 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2618 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2619 Arguments::_ClipInlining = ClipInlining; 2620 Arguments::_BackgroundCompilation = BackgroundCompilation; 2621 if (TieredCompilation) { 2622 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2623 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2624 } 2625 2626 // Setup flags for mixed which is the default 2627 set_mode_flags(_mixed); 2628 2629 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2630 // variable (if present). 2631 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2632 if (result != JNI_OK) { 2633 return result; 2634 } 2635 2636 // Parse args structure generated from the command line flags. 2637 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2638 if (result != JNI_OK) { 2639 return result; 2640 } 2641 2642 // Parse args structure generated from the _JAVA_OPTIONS environment 2643 // variable (if present) (mimics classic VM) 2644 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2645 if (result != JNI_OK) { 2646 return result; 2647 } 2648 2649 // Do final processing now that all arguments have been parsed 2650 result = finalize_vm_init_args(); 2651 if (result != JNI_OK) { 2652 return result; 2653 } 2654 2655 return JNI_OK; 2656 } 2657 2658 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2659 // represents a valid JDWP agent. is_path==true denotes that we 2660 // are dealing with -agentpath (case where name is a path), otherwise with 2661 // -agentlib 2662 bool valid_jdwp_agent(char *name, bool is_path) { 2663 char *_name; 2664 const char *_jdwp = "jdwp"; 2665 size_t _len_jdwp, _len_prefix; 2666 2667 if (is_path) { 2668 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2669 return false; 2670 } 2671 2672 _name++; // skip past last path separator 2673 _len_prefix = strlen(JNI_LIB_PREFIX); 2674 2675 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2676 return false; 2677 } 2678 2679 _name += _len_prefix; 2680 _len_jdwp = strlen(_jdwp); 2681 2682 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2683 _name += _len_jdwp; 2684 } 2685 else { 2686 return false; 2687 } 2688 2689 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2690 return false; 2691 } 2692 2693 return true; 2694 } 2695 2696 if (strcmp(name, _jdwp) == 0) { 2697 return true; 2698 } 2699 2700 return false; 2701 } 2702 2703 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2704 // --patch-module=<module>=<file>(<pathsep><file>)* 2705 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2706 // Find the equal sign between the module name and the path specification 2707 const char* module_equal = strchr(patch_mod_tail, '='); 2708 if (module_equal == NULL) { 2709 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2710 return JNI_ERR; 2711 } else { 2712 // Pick out the module name 2713 size_t module_len = module_equal - patch_mod_tail; 2714 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2715 if (module_name != NULL) { 2716 memcpy(module_name, patch_mod_tail, module_len); 2717 *(module_name + module_len) = '\0'; 2718 // The path piece begins one past the module_equal sign 2719 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2720 FREE_C_HEAP_ARRAY(char, module_name); 2721 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2722 return JNI_ENOMEM; 2723 } 2724 } else { 2725 return JNI_ENOMEM; 2726 } 2727 } 2728 return JNI_OK; 2729 } 2730 2731 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2732 // For match_option to return remaining or value part of option string 2733 const char* tail; 2734 2735 // iterate over arguments 2736 for (int index = 0; index < args->nOptions; index++) { 2737 bool is_absolute_path = false; // for -agentpath vs -agentlib 2738 2739 const JavaVMOption* option = args->options + index; 2740 2741 if (!match_option(option, "-Djava.class.path", &tail) && 2742 !match_option(option, "-Dsun.java.command", &tail) && 2743 !match_option(option, "-Dsun.java.launcher", &tail)) { 2744 2745 // add all jvm options to the jvm_args string. This string 2746 // is used later to set the java.vm.args PerfData string constant. 2747 // the -Djava.class.path and the -Dsun.java.command options are 2748 // omitted from jvm_args string as each have their own PerfData 2749 // string constant object. 2750 build_jvm_args(option->optionString); 2751 } 2752 2753 // -verbose:[class/gc/jni] 2754 if (match_option(option, "-verbose", &tail)) { 2755 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2756 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2757 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2758 } else if (!strcmp(tail, ":gc")) { 2759 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2760 } else if (!strcmp(tail, ":jni")) { 2761 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2762 return JNI_EINVAL; 2763 } 2764 } 2765 // -da / -ea / -disableassertions / -enableassertions 2766 // These accept an optional class/package name separated by a colon, e.g., 2767 // -da:java.lang.Thread. 2768 } else if (match_option(option, user_assertion_options, &tail, true)) { 2769 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2770 if (*tail == '\0') { 2771 JavaAssertions::setUserClassDefault(enable); 2772 } else { 2773 assert(*tail == ':', "bogus match by match_option()"); 2774 JavaAssertions::addOption(tail + 1, enable); 2775 } 2776 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2777 } else if (match_option(option, system_assertion_options, &tail, false)) { 2778 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2779 JavaAssertions::setSystemClassDefault(enable); 2780 // -bootclasspath: 2781 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2782 jio_fprintf(defaultStream::output_stream(), 2783 "-Xbootclasspath is no longer a supported option.\n"); 2784 return JNI_EINVAL; 2785 // -bootclasspath/a: 2786 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2787 Arguments::append_sysclasspath(tail); 2788 // -bootclasspath/p: 2789 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2790 jio_fprintf(defaultStream::output_stream(), 2791 "-Xbootclasspath/p is no longer a supported option.\n"); 2792 return JNI_EINVAL; 2793 // -Xrun 2794 } else if (match_option(option, "-Xrun", &tail)) { 2795 if (tail != NULL) { 2796 const char* pos = strchr(tail, ':'); 2797 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2798 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2799 name[len] = '\0'; 2800 2801 char *options = NULL; 2802 if(pos != NULL) { 2803 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2804 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2805 } 2806 #if !INCLUDE_JVMTI 2807 if (strcmp(name, "jdwp") == 0) { 2808 jio_fprintf(defaultStream::error_stream(), 2809 "Debugging agents are not supported in this VM\n"); 2810 return JNI_ERR; 2811 } 2812 #endif // !INCLUDE_JVMTI 2813 add_init_library(name, options); 2814 } 2815 } else if (match_option(option, "--add-reads=", &tail)) { 2816 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2817 return JNI_ENOMEM; 2818 } 2819 } else if (match_option(option, "--add-exports=", &tail)) { 2820 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2821 return JNI_ENOMEM; 2822 } 2823 } else if (match_option(option, "--add-modules=", &tail)) { 2824 add_modules_value = tail; 2825 } else if (match_option(option, "--limit-modules=", &tail)) { 2826 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2827 return JNI_ENOMEM; 2828 } 2829 } else if (match_option(option, "--module-path=", &tail)) { 2830 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2831 return JNI_ENOMEM; 2832 } 2833 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2834 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2835 return JNI_ENOMEM; 2836 } 2837 } else if (match_option(option, "--patch-module=", &tail)) { 2838 // --patch-module=<module>=<file>(<pathsep><file>)* 2839 int res = process_patch_mod_option(tail, patch_mod_javabase); 2840 if (res != JNI_OK) { 2841 return res; 2842 } 2843 // -agentlib and -agentpath 2844 } else if (match_option(option, "-agentlib:", &tail) || 2845 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2846 if(tail != NULL) { 2847 const char* pos = strchr(tail, '='); 2848 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2849 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2850 name[len] = '\0'; 2851 2852 char *options = NULL; 2853 if(pos != NULL) { 2854 options = os::strdup_check_oom(pos + 1, mtArguments); 2855 } 2856 #if !INCLUDE_JVMTI 2857 if (valid_jdwp_agent(name, is_absolute_path)) { 2858 jio_fprintf(defaultStream::error_stream(), 2859 "Debugging agents are not supported in this VM\n"); 2860 return JNI_ERR; 2861 } 2862 #endif // !INCLUDE_JVMTI 2863 add_init_agent(name, options, is_absolute_path); 2864 } 2865 // -javaagent 2866 } else if (match_option(option, "-javaagent:", &tail)) { 2867 #if !INCLUDE_JVMTI 2868 jio_fprintf(defaultStream::error_stream(), 2869 "Instrumentation agents are not supported in this VM\n"); 2870 return JNI_ERR; 2871 #else 2872 if (tail != NULL) { 2873 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtArguments), tail); 2874 add_init_agent("instrument", options, false); 2875 // java agents need module java.instrument 2876 if (!Arguments::append_to_addmods_property("java.instrument")) { 2877 return JNI_ENOMEM; 2878 } 2879 } 2880 #endif // !INCLUDE_JVMTI 2881 // -Xnoclassgc 2882 } else if (match_option(option, "-Xnoclassgc")) { 2883 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2884 return JNI_EINVAL; 2885 } 2886 // -Xconcgc 2887 } else if (match_option(option, "-Xconcgc")) { 2888 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2889 return JNI_EINVAL; 2890 } 2891 // -Xnoconcgc 2892 } else if (match_option(option, "-Xnoconcgc")) { 2893 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2894 return JNI_EINVAL; 2895 } 2896 // -Xbatch 2897 } else if (match_option(option, "-Xbatch")) { 2898 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2899 return JNI_EINVAL; 2900 } 2901 // -Xmn for compatibility with other JVM vendors 2902 } else if (match_option(option, "-Xmn", &tail)) { 2903 julong long_initial_young_size = 0; 2904 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2905 if (errcode != arg_in_range) { 2906 jio_fprintf(defaultStream::error_stream(), 2907 "Invalid initial young generation size: %s\n", option->optionString); 2908 describe_range_error(errcode); 2909 return JNI_EINVAL; 2910 } 2911 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2912 return JNI_EINVAL; 2913 } 2914 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2915 return JNI_EINVAL; 2916 } 2917 // -Xms 2918 } else if (match_option(option, "-Xms", &tail)) { 2919 julong long_initial_heap_size = 0; 2920 // an initial heap size of 0 means automatically determine 2921 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2922 if (errcode != arg_in_range) { 2923 jio_fprintf(defaultStream::error_stream(), 2924 "Invalid initial heap size: %s\n", option->optionString); 2925 describe_range_error(errcode); 2926 return JNI_EINVAL; 2927 } 2928 set_min_heap_size((size_t)long_initial_heap_size); 2929 // Currently the minimum size and the initial heap sizes are the same. 2930 // Can be overridden with -XX:InitialHeapSize. 2931 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2932 return JNI_EINVAL; 2933 } 2934 // -Xmx 2935 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2936 julong long_max_heap_size = 0; 2937 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2938 if (errcode != arg_in_range) { 2939 jio_fprintf(defaultStream::error_stream(), 2940 "Invalid maximum heap size: %s\n", option->optionString); 2941 describe_range_error(errcode); 2942 return JNI_EINVAL; 2943 } 2944 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2945 return JNI_EINVAL; 2946 } 2947 // Xmaxf 2948 } else if (match_option(option, "-Xmaxf", &tail)) { 2949 char* err; 2950 int maxf = (int)(strtod(tail, &err) * 100); 2951 if (*err != '\0' || *tail == '\0') { 2952 jio_fprintf(defaultStream::error_stream(), 2953 "Bad max heap free percentage size: %s\n", 2954 option->optionString); 2955 return JNI_EINVAL; 2956 } else { 2957 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2958 return JNI_EINVAL; 2959 } 2960 } 2961 // Xminf 2962 } else if (match_option(option, "-Xminf", &tail)) { 2963 char* err; 2964 int minf = (int)(strtod(tail, &err) * 100); 2965 if (*err != '\0' || *tail == '\0') { 2966 jio_fprintf(defaultStream::error_stream(), 2967 "Bad min heap free percentage size: %s\n", 2968 option->optionString); 2969 return JNI_EINVAL; 2970 } else { 2971 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2972 return JNI_EINVAL; 2973 } 2974 } 2975 // -Xss 2976 } else if (match_option(option, "-Xss", &tail)) { 2977 julong long_ThreadStackSize = 0; 2978 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2979 if (errcode != arg_in_range) { 2980 jio_fprintf(defaultStream::error_stream(), 2981 "Invalid thread stack size: %s\n", option->optionString); 2982 describe_range_error(errcode); 2983 return JNI_EINVAL; 2984 } 2985 // Internally track ThreadStackSize in units of 1024 bytes. 2986 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2987 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2988 return JNI_EINVAL; 2989 } 2990 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 2991 } else if (match_option(option, "-Xoss", &tail) || 2992 match_option(option, "-Xsqnopause") || 2993 match_option(option, "-Xoptimize") || 2994 match_option(option, "-Xboundthreads") || 2995 match_option(option, "-Xusealtsigs")) { 2996 // All these options are deprecated in JDK 9 and will be removed in a future release 2997 char version[256]; 2998 JDK_Version::jdk(9).to_string(version, sizeof(version)); 2999 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3000 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3001 julong long_CodeCacheExpansionSize = 0; 3002 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3003 if (errcode != arg_in_range) { 3004 jio_fprintf(defaultStream::error_stream(), 3005 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3006 os::vm_page_size()/K); 3007 return JNI_EINVAL; 3008 } 3009 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3010 return JNI_EINVAL; 3011 } 3012 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3013 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3014 julong long_ReservedCodeCacheSize = 0; 3015 3016 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3017 if (errcode != arg_in_range) { 3018 jio_fprintf(defaultStream::error_stream(), 3019 "Invalid maximum code cache size: %s.\n", option->optionString); 3020 return JNI_EINVAL; 3021 } 3022 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3023 return JNI_EINVAL; 3024 } 3025 // -XX:NonNMethodCodeHeapSize= 3026 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3027 julong long_NonNMethodCodeHeapSize = 0; 3028 3029 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3030 if (errcode != arg_in_range) { 3031 jio_fprintf(defaultStream::error_stream(), 3032 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3033 return JNI_EINVAL; 3034 } 3035 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3036 return JNI_EINVAL; 3037 } 3038 // -XX:ProfiledCodeHeapSize= 3039 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3040 julong long_ProfiledCodeHeapSize = 0; 3041 3042 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3043 if (errcode != arg_in_range) { 3044 jio_fprintf(defaultStream::error_stream(), 3045 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3046 return JNI_EINVAL; 3047 } 3048 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3049 return JNI_EINVAL; 3050 } 3051 // -XX:NonProfiledCodeHeapSizee= 3052 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3053 julong long_NonProfiledCodeHeapSize = 0; 3054 3055 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3056 if (errcode != arg_in_range) { 3057 jio_fprintf(defaultStream::error_stream(), 3058 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3059 return JNI_EINVAL; 3060 } 3061 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3062 return JNI_EINVAL; 3063 } 3064 // -green 3065 } else if (match_option(option, "-green")) { 3066 jio_fprintf(defaultStream::error_stream(), 3067 "Green threads support not available\n"); 3068 return JNI_EINVAL; 3069 // -native 3070 } else if (match_option(option, "-native")) { 3071 // HotSpot always uses native threads, ignore silently for compatibility 3072 // -Xrs 3073 } else if (match_option(option, "-Xrs")) { 3074 // Classic/EVM option, new functionality 3075 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3076 return JNI_EINVAL; 3077 } 3078 // -Xprof 3079 } else if (match_option(option, "-Xprof")) { 3080 #if INCLUDE_FPROF 3081 _has_profile = true; 3082 #else // INCLUDE_FPROF 3083 jio_fprintf(defaultStream::error_stream(), 3084 "Flat profiling is not supported in this VM.\n"); 3085 return JNI_ERR; 3086 #endif // INCLUDE_FPROF 3087 // -Xconcurrentio 3088 } else if (match_option(option, "-Xconcurrentio")) { 3089 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3090 return JNI_EINVAL; 3091 } 3092 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3093 return JNI_EINVAL; 3094 } 3095 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3096 return JNI_EINVAL; 3097 } 3098 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3099 return JNI_EINVAL; 3100 } 3101 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3102 return JNI_EINVAL; 3103 } 3104 3105 // -Xinternalversion 3106 } else if (match_option(option, "-Xinternalversion")) { 3107 jio_fprintf(defaultStream::output_stream(), "%s\n", 3108 VM_Version::internal_vm_info_string()); 3109 vm_exit(0); 3110 #ifndef PRODUCT 3111 // -Xprintflags 3112 } else if (match_option(option, "-Xprintflags")) { 3113 CommandLineFlags::printFlags(tty, false); 3114 vm_exit(0); 3115 #endif 3116 // -D 3117 } else if (match_option(option, "-D", &tail)) { 3118 const char* value; 3119 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3120 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3121 // abort if -Djava.endorsed.dirs is set 3122 jio_fprintf(defaultStream::output_stream(), 3123 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3124 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3125 return JNI_EINVAL; 3126 } 3127 if (match_option(option, "-Djava.ext.dirs=", &value) && 3128 *value != '\0' && strcmp(value, "\"\"") != 0) { 3129 // abort if -Djava.ext.dirs is set 3130 jio_fprintf(defaultStream::output_stream(), 3131 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3132 return JNI_EINVAL; 3133 } 3134 // Check for module related properties. They must be set using the modules 3135 // options. For example: use "--add-modules=java.sql", not 3136 // "-Djdk.module.addmods=java.sql" 3137 if (is_internal_module_property(option->optionString + 2)) { 3138 needs_module_property_warning = true; 3139 continue; 3140 } 3141 3142 if (!add_property(tail)) { 3143 return JNI_ENOMEM; 3144 } 3145 // Out of the box management support 3146 if (match_option(option, "-Dcom.sun.management", &tail)) { 3147 #if INCLUDE_MANAGEMENT 3148 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3149 return JNI_EINVAL; 3150 } 3151 // management agent in module java.management 3152 if (!Arguments::append_to_addmods_property("java.management")) { 3153 return JNI_ENOMEM; 3154 } 3155 #else 3156 jio_fprintf(defaultStream::output_stream(), 3157 "-Dcom.sun.management is not supported in this VM.\n"); 3158 return JNI_ERR; 3159 #endif 3160 } 3161 // -Xint 3162 } else if (match_option(option, "-Xint")) { 3163 set_mode_flags(_int); 3164 // -Xmixed 3165 } else if (match_option(option, "-Xmixed")) { 3166 set_mode_flags(_mixed); 3167 // -Xcomp 3168 } else if (match_option(option, "-Xcomp")) { 3169 // for testing the compiler; turn off all flags that inhibit compilation 3170 set_mode_flags(_comp); 3171 // -Xshare:dump 3172 } else if (match_option(option, "-Xshare:dump")) { 3173 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3174 return JNI_EINVAL; 3175 } 3176 set_mode_flags(_int); // Prevent compilation, which creates objects 3177 // -Xshare:on 3178 } else if (match_option(option, "-Xshare:on")) { 3179 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3180 return JNI_EINVAL; 3181 } 3182 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3183 return JNI_EINVAL; 3184 } 3185 // -Xshare:auto 3186 } else if (match_option(option, "-Xshare:auto")) { 3187 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3188 return JNI_EINVAL; 3189 } 3190 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3191 return JNI_EINVAL; 3192 } 3193 // -Xshare:off 3194 } else if (match_option(option, "-Xshare:off")) { 3195 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3196 return JNI_EINVAL; 3197 } 3198 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3199 return JNI_EINVAL; 3200 } 3201 // -Xverify 3202 } else if (match_option(option, "-Xverify", &tail)) { 3203 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3204 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3205 return JNI_EINVAL; 3206 } 3207 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3208 return JNI_EINVAL; 3209 } 3210 } else if (strcmp(tail, ":remote") == 0) { 3211 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3212 return JNI_EINVAL; 3213 } 3214 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3215 return JNI_EINVAL; 3216 } 3217 } else if (strcmp(tail, ":none") == 0) { 3218 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3219 return JNI_EINVAL; 3220 } 3221 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3222 return JNI_EINVAL; 3223 } 3224 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3225 return JNI_EINVAL; 3226 } 3227 // -Xdebug 3228 } else if (match_option(option, "-Xdebug")) { 3229 // note this flag has been used, then ignore 3230 set_xdebug_mode(true); 3231 // -Xnoagent 3232 } else if (match_option(option, "-Xnoagent")) { 3233 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3234 } else if (match_option(option, "-Xloggc:", &tail)) { 3235 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3236 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3237 _gc_log_filename = os::strdup_check_oom(tail); 3238 } else if (match_option(option, "-Xlog", &tail)) { 3239 bool ret = false; 3240 if (strcmp(tail, ":help") == 0) { 3241 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3242 vm_exit(0); 3243 } else if (strcmp(tail, ":disable") == 0) { 3244 LogConfiguration::disable_logging(); 3245 ret = true; 3246 } else if (*tail == '\0') { 3247 ret = LogConfiguration::parse_command_line_arguments(); 3248 assert(ret, "-Xlog without arguments should never fail to parse"); 3249 } else if (*tail == ':') { 3250 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3251 } 3252 if (ret == false) { 3253 jio_fprintf(defaultStream::error_stream(), 3254 "Invalid -Xlog option '-Xlog%s'\n", 3255 tail); 3256 return JNI_EINVAL; 3257 } 3258 // JNI hooks 3259 } else if (match_option(option, "-Xcheck", &tail)) { 3260 if (!strcmp(tail, ":jni")) { 3261 #if !INCLUDE_JNI_CHECK 3262 warning("JNI CHECKING is not supported in this VM"); 3263 #else 3264 CheckJNICalls = true; 3265 #endif // INCLUDE_JNI_CHECK 3266 } else if (is_bad_option(option, args->ignoreUnrecognized, 3267 "check")) { 3268 return JNI_EINVAL; 3269 } 3270 } else if (match_option(option, "vfprintf")) { 3271 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3272 } else if (match_option(option, "exit")) { 3273 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3274 } else if (match_option(option, "abort")) { 3275 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3276 // -XX:+AggressiveHeap 3277 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3278 jint result = set_aggressive_heap_flags(); 3279 if (result != JNI_OK) { 3280 return result; 3281 } 3282 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3283 // and the last option wins. 3284 } else if (match_option(option, "-XX:+NeverTenure")) { 3285 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3286 return JNI_EINVAL; 3287 } 3288 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3289 return JNI_EINVAL; 3290 } 3291 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3292 return JNI_EINVAL; 3293 } 3294 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3295 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3296 return JNI_EINVAL; 3297 } 3298 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3299 return JNI_EINVAL; 3300 } 3301 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3302 return JNI_EINVAL; 3303 } 3304 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3305 uintx max_tenuring_thresh = 0; 3306 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3307 jio_fprintf(defaultStream::error_stream(), 3308 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3309 return JNI_EINVAL; 3310 } 3311 3312 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3313 return JNI_EINVAL; 3314 } 3315 3316 if (MaxTenuringThreshold == 0) { 3317 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3318 return JNI_EINVAL; 3319 } 3320 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3321 return JNI_EINVAL; 3322 } 3323 } else { 3324 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3325 return JNI_EINVAL; 3326 } 3327 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3328 return JNI_EINVAL; 3329 } 3330 } 3331 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3332 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3333 return JNI_EINVAL; 3334 } 3335 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3336 return JNI_EINVAL; 3337 } 3338 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3339 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3340 return JNI_EINVAL; 3341 } 3342 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3343 return JNI_EINVAL; 3344 } 3345 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3346 #if defined(DTRACE_ENABLED) 3347 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3348 return JNI_EINVAL; 3349 } 3350 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3351 return JNI_EINVAL; 3352 } 3353 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3354 return JNI_EINVAL; 3355 } 3356 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3357 return JNI_EINVAL; 3358 } 3359 #else // defined(DTRACE_ENABLED) 3360 jio_fprintf(defaultStream::error_stream(), 3361 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3362 return JNI_EINVAL; 3363 #endif // defined(DTRACE_ENABLED) 3364 #ifdef ASSERT 3365 } else if (match_option(option, "-XX:+FullGCALot")) { 3366 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3367 return JNI_EINVAL; 3368 } 3369 // disable scavenge before parallel mark-compact 3370 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3371 return JNI_EINVAL; 3372 } 3373 #endif 3374 #if !INCLUDE_MANAGEMENT 3375 } else if (match_option(option, "-XX:+ManagementServer")) { 3376 jio_fprintf(defaultStream::error_stream(), 3377 "ManagementServer is not supported in this VM.\n"); 3378 return JNI_ERR; 3379 #endif // INCLUDE_MANAGEMENT 3380 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3381 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3382 // already been handled 3383 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3384 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3385 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3386 return JNI_EINVAL; 3387 } 3388 } 3389 // Unknown option 3390 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3391 return JNI_ERR; 3392 } 3393 } 3394 3395 // PrintSharedArchiveAndExit will turn on 3396 // -Xshare:on 3397 // -Xlog:class+path=info 3398 if (PrintSharedArchiveAndExit) { 3399 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3400 return JNI_EINVAL; 3401 } 3402 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3403 return JNI_EINVAL; 3404 } 3405 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3406 } 3407 3408 // Change the default value for flags which have different default values 3409 // when working with older JDKs. 3410 #ifdef LINUX 3411 if (JDK_Version::current().compare_major(6) <= 0 && 3412 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3413 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3414 } 3415 #endif // LINUX 3416 fix_appclasspath(); 3417 return JNI_OK; 3418 } 3419 3420 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3421 // For java.base check for duplicate --patch-module options being specified on the command line. 3422 // This check is only required for java.base, all other duplicate module specifications 3423 // will be checked during module system initialization. The module system initialization 3424 // will throw an ExceptionInInitializerError if this situation occurs. 3425 if (strcmp(module_name, "java.base") == 0) { 3426 if (*patch_mod_javabase) { 3427 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module"); 3428 } else { 3429 *patch_mod_javabase = true; 3430 } 3431 } 3432 3433 // Create GrowableArray lazily, only if --patch-module has been specified 3434 if (_patch_mod_prefix == NULL) { 3435 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3436 } 3437 3438 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3439 } 3440 3441 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3442 // 3443 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3444 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3445 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3446 // path is treated as the current directory. 3447 // 3448 // This causes problems with CDS, which requires that all directories specified in the classpath 3449 // must be empty. In most cases, applications do NOT want to load classes from the current 3450 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3451 // scripts compatible with CDS. 3452 void Arguments::fix_appclasspath() { 3453 if (IgnoreEmptyClassPaths) { 3454 const char separator = *os::path_separator(); 3455 const char* src = _java_class_path->value(); 3456 3457 // skip over all the leading empty paths 3458 while (*src == separator) { 3459 src ++; 3460 } 3461 3462 char* copy = os::strdup_check_oom(src, mtArguments); 3463 3464 // trim all trailing empty paths 3465 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3466 *tail = '\0'; 3467 } 3468 3469 char from[3] = {separator, separator, '\0'}; 3470 char to [2] = {separator, '\0'}; 3471 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3472 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3473 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3474 } 3475 3476 _java_class_path->set_writeable_value(copy); 3477 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3478 } 3479 } 3480 3481 static bool has_jar_files(const char* directory) { 3482 DIR* dir = os::opendir(directory); 3483 if (dir == NULL) return false; 3484 3485 struct dirent *entry; 3486 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3487 bool hasJarFile = false; 3488 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3489 const char* name = entry->d_name; 3490 const char* ext = name + strlen(name) - 4; 3491 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3492 } 3493 FREE_C_HEAP_ARRAY(char, dbuf); 3494 os::closedir(dir); 3495 return hasJarFile ; 3496 } 3497 3498 static int check_non_empty_dirs(const char* path) { 3499 const char separator = *os::path_separator(); 3500 const char* const end = path + strlen(path); 3501 int nonEmptyDirs = 0; 3502 while (path < end) { 3503 const char* tmp_end = strchr(path, separator); 3504 if (tmp_end == NULL) { 3505 if (has_jar_files(path)) { 3506 nonEmptyDirs++; 3507 jio_fprintf(defaultStream::output_stream(), 3508 "Non-empty directory: %s\n", path); 3509 } 3510 path = end; 3511 } else { 3512 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3513 memcpy(dirpath, path, tmp_end - path); 3514 dirpath[tmp_end - path] = '\0'; 3515 if (has_jar_files(dirpath)) { 3516 nonEmptyDirs++; 3517 jio_fprintf(defaultStream::output_stream(), 3518 "Non-empty directory: %s\n", dirpath); 3519 } 3520 FREE_C_HEAP_ARRAY(char, dirpath); 3521 path = tmp_end + 1; 3522 } 3523 } 3524 return nonEmptyDirs; 3525 } 3526 3527 jint Arguments::finalize_vm_init_args() { 3528 // check if the default lib/endorsed directory exists; if so, error 3529 char path[JVM_MAXPATHLEN]; 3530 const char* fileSep = os::file_separator(); 3531 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3532 3533 if (CheckEndorsedAndExtDirs) { 3534 int nonEmptyDirs = 0; 3535 // check endorsed directory 3536 nonEmptyDirs += check_non_empty_dirs(path); 3537 // check the extension directories 3538 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3539 if (nonEmptyDirs > 0) { 3540 return JNI_ERR; 3541 } 3542 } 3543 3544 DIR* dir = os::opendir(path); 3545 if (dir != NULL) { 3546 jio_fprintf(defaultStream::output_stream(), 3547 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3548 "in modular form will be supported via the concept of upgradeable modules.\n"); 3549 os::closedir(dir); 3550 return JNI_ERR; 3551 } 3552 3553 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3554 dir = os::opendir(path); 3555 if (dir != NULL) { 3556 jio_fprintf(defaultStream::output_stream(), 3557 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3558 "Use -classpath instead.\n."); 3559 os::closedir(dir); 3560 return JNI_ERR; 3561 } 3562 3563 // Append the value of the last --add-modules option specified on the command line. 3564 // This needs to be done here, to prevent overwriting possible values written 3565 // to the jdk.module.addmods property by -javaagent and other options. 3566 if (add_modules_value != NULL) { 3567 if (!append_to_addmods_property(add_modules_value)) { 3568 return JNI_ENOMEM; 3569 } 3570 } 3571 3572 // This must be done after all arguments have been processed. 3573 // java_compiler() true means set to "NONE" or empty. 3574 if (java_compiler() && !xdebug_mode()) { 3575 // For backwards compatibility, we switch to interpreted mode if 3576 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3577 // not specified. 3578 set_mode_flags(_int); 3579 } 3580 3581 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3582 // but like -Xint, leave compilation thresholds unaffected. 3583 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3584 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3585 set_mode_flags(_int); 3586 } 3587 3588 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3589 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3590 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3591 } 3592 3593 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3594 // Don't degrade server performance for footprint 3595 if (FLAG_IS_DEFAULT(UseLargePages) && 3596 MaxHeapSize < LargePageHeapSizeThreshold) { 3597 // No need for large granularity pages w/small heaps. 3598 // Note that large pages are enabled/disabled for both the 3599 // Java heap and the code cache. 3600 FLAG_SET_DEFAULT(UseLargePages, false); 3601 } 3602 3603 #elif defined(COMPILER2) 3604 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3605 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3606 } 3607 #endif 3608 3609 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3610 UNSUPPORTED_OPTION(ProfileInterpreter); 3611 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3612 #endif 3613 3614 #ifndef TIERED 3615 // Tiered compilation is undefined. 3616 UNSUPPORTED_OPTION(TieredCompilation); 3617 #endif 3618 3619 #if INCLUDE_JVMCI 3620 if (EnableJVMCI && !append_to_addmods_property("jdk.vm.ci")) { 3621 return JNI_ENOMEM; 3622 } 3623 #endif 3624 3625 // If we are running in a headless jre, force java.awt.headless property 3626 // to be true unless the property has already been set. 3627 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3628 if (os::is_headless_jre()) { 3629 const char* headless = Arguments::get_property("java.awt.headless"); 3630 if (headless == NULL) { 3631 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3632 if (headless_env == NULL) { 3633 if (!add_property("java.awt.headless=true")) { 3634 return JNI_ENOMEM; 3635 } 3636 } else { 3637 char buffer[256]; 3638 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3639 if (!add_property(buffer)) { 3640 return JNI_ENOMEM; 3641 } 3642 } 3643 } 3644 } 3645 3646 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3647 // CMS can only be used with ParNew 3648 FLAG_SET_ERGO(bool, UseParNewGC, true); 3649 } 3650 3651 if (!check_vm_args_consistency()) { 3652 return JNI_ERR; 3653 } 3654 3655 return JNI_OK; 3656 } 3657 3658 // Helper class for controlling the lifetime of JavaVMInitArgs 3659 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3660 // deleted on the destruction of the ScopedVMInitArgs object. 3661 class ScopedVMInitArgs : public StackObj { 3662 private: 3663 JavaVMInitArgs _args; 3664 char* _container_name; 3665 bool _is_set; 3666 char* _vm_options_file_arg; 3667 3668 public: 3669 ScopedVMInitArgs(const char *container_name) { 3670 _args.version = JNI_VERSION_1_2; 3671 _args.nOptions = 0; 3672 _args.options = NULL; 3673 _args.ignoreUnrecognized = false; 3674 _container_name = (char *)container_name; 3675 _is_set = false; 3676 _vm_options_file_arg = NULL; 3677 } 3678 3679 // Populates the JavaVMInitArgs object represented by this 3680 // ScopedVMInitArgs object with the arguments in options. The 3681 // allocated memory is deleted by the destructor. If this method 3682 // returns anything other than JNI_OK, then this object is in a 3683 // partially constructed state, and should be abandoned. 3684 jint set_args(GrowableArray<JavaVMOption>* options) { 3685 _is_set = true; 3686 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3687 JavaVMOption, options->length(), mtArguments); 3688 if (options_arr == NULL) { 3689 return JNI_ENOMEM; 3690 } 3691 _args.options = options_arr; 3692 3693 for (int i = 0; i < options->length(); i++) { 3694 options_arr[i] = options->at(i); 3695 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3696 if (options_arr[i].optionString == NULL) { 3697 // Rely on the destructor to do cleanup. 3698 _args.nOptions = i; 3699 return JNI_ENOMEM; 3700 } 3701 } 3702 3703 _args.nOptions = options->length(); 3704 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3705 return JNI_OK; 3706 } 3707 3708 JavaVMInitArgs* get() { return &_args; } 3709 char* container_name() { return _container_name; } 3710 bool is_set() { return _is_set; } 3711 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3712 char* vm_options_file_arg() { return _vm_options_file_arg; } 3713 3714 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3715 if (_vm_options_file_arg != NULL) { 3716 os::free(_vm_options_file_arg); 3717 } 3718 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3719 } 3720 3721 ~ScopedVMInitArgs() { 3722 if (_vm_options_file_arg != NULL) { 3723 os::free(_vm_options_file_arg); 3724 } 3725 if (_args.options == NULL) return; 3726 for (int i = 0; i < _args.nOptions; i++) { 3727 os::free(_args.options[i].optionString); 3728 } 3729 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3730 } 3731 3732 // Insert options into this option list, to replace option at 3733 // vm_options_file_pos (-XX:VMOptionsFile) 3734 jint insert(const JavaVMInitArgs* args, 3735 const JavaVMInitArgs* args_to_insert, 3736 const int vm_options_file_pos) { 3737 assert(_args.options == NULL, "shouldn't be set yet"); 3738 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3739 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3740 3741 int length = args->nOptions + args_to_insert->nOptions - 1; 3742 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3743 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3744 for (int i = 0; i < args->nOptions; i++) { 3745 if (i == vm_options_file_pos) { 3746 // insert the new options starting at the same place as the 3747 // -XX:VMOptionsFile option 3748 for (int j = 0; j < args_to_insert->nOptions; j++) { 3749 options->push(args_to_insert->options[j]); 3750 } 3751 } else { 3752 options->push(args->options[i]); 3753 } 3754 } 3755 // make into options array 3756 jint result = set_args(options); 3757 delete options; 3758 return result; 3759 } 3760 }; 3761 3762 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3763 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3764 } 3765 3766 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3767 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3768 } 3769 3770 jint Arguments::parse_options_environment_variable(const char* name, 3771 ScopedVMInitArgs* vm_args) { 3772 char *buffer = ::getenv(name); 3773 3774 // Don't check this environment variable if user has special privileges 3775 // (e.g. unix su command). 3776 if (buffer == NULL || os::have_special_privileges()) { 3777 return JNI_OK; 3778 } 3779 3780 if ((buffer = os::strdup(buffer)) == NULL) { 3781 return JNI_ENOMEM; 3782 } 3783 3784 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3785 3786 os::free(buffer); 3787 return retcode; 3788 } 3789 3790 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3791 // read file into buffer 3792 int fd = ::open(file_name, O_RDONLY); 3793 if (fd < 0) { 3794 jio_fprintf(defaultStream::error_stream(), 3795 "Could not open options file '%s'\n", 3796 file_name); 3797 return JNI_ERR; 3798 } 3799 3800 struct stat stbuf; 3801 int retcode = os::stat(file_name, &stbuf); 3802 if (retcode != 0) { 3803 jio_fprintf(defaultStream::error_stream(), 3804 "Could not stat options file '%s'\n", 3805 file_name); 3806 os::close(fd); 3807 return JNI_ERR; 3808 } 3809 3810 if (stbuf.st_size == 0) { 3811 // tell caller there is no option data and that is ok 3812 os::close(fd); 3813 return JNI_OK; 3814 } 3815 3816 // '+ 1' for NULL termination even with max bytes 3817 size_t bytes_alloc = stbuf.st_size + 1; 3818 3819 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3820 if (NULL == buf) { 3821 jio_fprintf(defaultStream::error_stream(), 3822 "Could not allocate read buffer for options file parse\n"); 3823 os::close(fd); 3824 return JNI_ENOMEM; 3825 } 3826 3827 memset(buf, 0, bytes_alloc); 3828 3829 // Fill buffer 3830 // Use ::read() instead of os::read because os::read() 3831 // might do a thread state transition 3832 // and it is too early for that here 3833 3834 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3835 os::close(fd); 3836 if (bytes_read < 0) { 3837 FREE_C_HEAP_ARRAY(char, buf); 3838 jio_fprintf(defaultStream::error_stream(), 3839 "Could not read options file '%s'\n", file_name); 3840 return JNI_ERR; 3841 } 3842 3843 if (bytes_read == 0) { 3844 // tell caller there is no option data and that is ok 3845 FREE_C_HEAP_ARRAY(char, buf); 3846 return JNI_OK; 3847 } 3848 3849 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3850 3851 FREE_C_HEAP_ARRAY(char, buf); 3852 return retcode; 3853 } 3854 3855 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3856 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3857 3858 // some pointers to help with parsing 3859 char *buffer_end = buffer + buf_len; 3860 char *opt_hd = buffer; 3861 char *wrt = buffer; 3862 char *rd = buffer; 3863 3864 // parse all options 3865 while (rd < buffer_end) { 3866 // skip leading white space from the input string 3867 while (rd < buffer_end && isspace(*rd)) { 3868 rd++; 3869 } 3870 3871 if (rd >= buffer_end) { 3872 break; 3873 } 3874 3875 // Remember this is where we found the head of the token. 3876 opt_hd = wrt; 3877 3878 // Tokens are strings of non white space characters separated 3879 // by one or more white spaces. 3880 while (rd < buffer_end && !isspace(*rd)) { 3881 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3882 int quote = *rd; // matching quote to look for 3883 rd++; // don't copy open quote 3884 while (rd < buffer_end && *rd != quote) { 3885 // include everything (even spaces) 3886 // up until the close quote 3887 *wrt++ = *rd++; // copy to option string 3888 } 3889 3890 if (rd < buffer_end) { 3891 rd++; // don't copy close quote 3892 } else { 3893 // did not see closing quote 3894 jio_fprintf(defaultStream::error_stream(), 3895 "Unmatched quote in %s\n", name); 3896 delete options; 3897 return JNI_ERR; 3898 } 3899 } else { 3900 *wrt++ = *rd++; // copy to option string 3901 } 3902 } 3903 3904 // steal a white space character and set it to NULL 3905 *wrt++ = '\0'; 3906 // We now have a complete token 3907 3908 JavaVMOption option; 3909 option.optionString = opt_hd; 3910 option.extraInfo = NULL; 3911 3912 options->append(option); // Fill in option 3913 3914 rd++; // Advance to next character 3915 } 3916 3917 // Fill out JavaVMInitArgs structure. 3918 jint status = vm_args->set_args(options); 3919 3920 delete options; 3921 return status; 3922 } 3923 3924 void Arguments::set_shared_spaces_flags() { 3925 if (DumpSharedSpaces) { 3926 if (Arguments::get_patch_mod_prefix() != NULL) { 3927 vm_exit_during_initialization( 3928 "Cannot use the following option when dumping the shared archive: --patch-module"); 3929 } 3930 3931 if (RequireSharedSpaces) { 3932 warning("Cannot dump shared archive while using shared archive"); 3933 } 3934 UseSharedSpaces = false; 3935 #ifdef _LP64 3936 if (!UseCompressedOops || !UseCompressedClassPointers) { 3937 vm_exit_during_initialization( 3938 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3939 } 3940 } else { 3941 if (!UseCompressedOops || !UseCompressedClassPointers) { 3942 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3943 } 3944 #endif 3945 } 3946 } 3947 3948 // Sharing support 3949 // Construct the path to the archive 3950 static char* get_shared_archive_path() { 3951 char *shared_archive_path; 3952 if (SharedArchiveFile == NULL) { 3953 char jvm_path[JVM_MAXPATHLEN]; 3954 os::jvm_path(jvm_path, sizeof(jvm_path)); 3955 char *end = strrchr(jvm_path, *os::file_separator()); 3956 if (end != NULL) *end = '\0'; 3957 size_t jvm_path_len = strlen(jvm_path); 3958 size_t file_sep_len = strlen(os::file_separator()); 3959 const size_t len = jvm_path_len + file_sep_len + 20; 3960 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3961 if (shared_archive_path != NULL) { 3962 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3963 jvm_path, os::file_separator()); 3964 } 3965 } else { 3966 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3967 } 3968 return shared_archive_path; 3969 } 3970 3971 #ifndef PRODUCT 3972 // Determine whether LogVMOutput should be implicitly turned on. 3973 static bool use_vm_log() { 3974 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3975 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3976 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3977 PrintAssembly || TraceDeoptimization || TraceDependencies || 3978 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3979 return true; 3980 } 3981 3982 #ifdef COMPILER1 3983 if (PrintC1Statistics) { 3984 return true; 3985 } 3986 #endif // COMPILER1 3987 3988 #ifdef COMPILER2 3989 if (PrintOptoAssembly || PrintOptoStatistics) { 3990 return true; 3991 } 3992 #endif // COMPILER2 3993 3994 return false; 3995 } 3996 3997 #endif // PRODUCT 3998 3999 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4000 for (int index = 0; index < args->nOptions; index++) { 4001 const JavaVMOption* option = args->options + index; 4002 const char* tail; 4003 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4004 return true; 4005 } 4006 } 4007 return false; 4008 } 4009 4010 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4011 const char* vm_options_file, 4012 const int vm_options_file_pos, 4013 ScopedVMInitArgs* vm_options_file_args, 4014 ScopedVMInitArgs* args_out) { 4015 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4016 if (code != JNI_OK) { 4017 return code; 4018 } 4019 4020 if (vm_options_file_args->get()->nOptions < 1) { 4021 return JNI_OK; 4022 } 4023 4024 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4025 jio_fprintf(defaultStream::error_stream(), 4026 "A VM options file may not refer to a VM options file. " 4027 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4028 "options file '%s' in options container '%s' is an error.\n", 4029 vm_options_file_args->vm_options_file_arg(), 4030 vm_options_file_args->container_name()); 4031 return JNI_EINVAL; 4032 } 4033 4034 return args_out->insert(args, vm_options_file_args->get(), 4035 vm_options_file_pos); 4036 } 4037 4038 // Expand -XX:VMOptionsFile found in args_in as needed. 4039 // mod_args and args_out parameters may return values as needed. 4040 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4041 ScopedVMInitArgs* mod_args, 4042 JavaVMInitArgs** args_out) { 4043 jint code = match_special_option_and_act(args_in, mod_args); 4044 if (code != JNI_OK) { 4045 return code; 4046 } 4047 4048 if (mod_args->is_set()) { 4049 // args_in contains -XX:VMOptionsFile and mod_args contains the 4050 // original options from args_in along with the options expanded 4051 // from the VMOptionsFile. Return a short-hand to the caller. 4052 *args_out = mod_args->get(); 4053 } else { 4054 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4055 } 4056 return JNI_OK; 4057 } 4058 4059 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4060 ScopedVMInitArgs* args_out) { 4061 // Remaining part of option string 4062 const char* tail; 4063 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4064 4065 for (int index = 0; index < args->nOptions; index++) { 4066 const JavaVMOption* option = args->options + index; 4067 if (ArgumentsExt::process_options(option)) { 4068 continue; 4069 } 4070 if (match_option(option, "-XX:Flags=", &tail)) { 4071 Arguments::set_jvm_flags_file(tail); 4072 continue; 4073 } 4074 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4075 if (vm_options_file_args.found_vm_options_file_arg()) { 4076 jio_fprintf(defaultStream::error_stream(), 4077 "The option '%s' is already specified in the options " 4078 "container '%s' so the specification of '%s' in the " 4079 "same options container is an error.\n", 4080 vm_options_file_args.vm_options_file_arg(), 4081 vm_options_file_args.container_name(), 4082 option->optionString); 4083 return JNI_EINVAL; 4084 } 4085 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4086 // If there's a VMOptionsFile, parse that 4087 jint code = insert_vm_options_file(args, tail, index, 4088 &vm_options_file_args, args_out); 4089 if (code != JNI_OK) { 4090 return code; 4091 } 4092 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4093 if (args_out->is_set()) { 4094 // The VMOptions file inserted some options so switch 'args' 4095 // to the new set of options, and continue processing which 4096 // preserves "last option wins" semantics. 4097 args = args_out->get(); 4098 // The first option from the VMOptionsFile replaces the 4099 // current option. So we back track to process the 4100 // replacement option. 4101 index--; 4102 } 4103 continue; 4104 } 4105 if (match_option(option, "-XX:+PrintVMOptions")) { 4106 PrintVMOptions = true; 4107 continue; 4108 } 4109 if (match_option(option, "-XX:-PrintVMOptions")) { 4110 PrintVMOptions = false; 4111 continue; 4112 } 4113 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4114 IgnoreUnrecognizedVMOptions = true; 4115 continue; 4116 } 4117 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4118 IgnoreUnrecognizedVMOptions = false; 4119 continue; 4120 } 4121 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4122 CommandLineFlags::printFlags(tty, false); 4123 vm_exit(0); 4124 } 4125 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4126 #if INCLUDE_NMT 4127 // The launcher did not setup nmt environment variable properly. 4128 if (!MemTracker::check_launcher_nmt_support(tail)) { 4129 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4130 } 4131 4132 // Verify if nmt option is valid. 4133 if (MemTracker::verify_nmt_option()) { 4134 // Late initialization, still in single-threaded mode. 4135 if (MemTracker::tracking_level() >= NMT_summary) { 4136 MemTracker::init(); 4137 } 4138 } else { 4139 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4140 } 4141 continue; 4142 #else 4143 jio_fprintf(defaultStream::error_stream(), 4144 "Native Memory Tracking is not supported in this VM\n"); 4145 return JNI_ERR; 4146 #endif 4147 } 4148 4149 #ifndef PRODUCT 4150 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4151 CommandLineFlags::printFlags(tty, true); 4152 vm_exit(0); 4153 } 4154 #endif 4155 } 4156 return JNI_OK; 4157 } 4158 4159 static void print_options(const JavaVMInitArgs *args) { 4160 const char* tail; 4161 for (int index = 0; index < args->nOptions; index++) { 4162 const JavaVMOption *option = args->options + index; 4163 if (match_option(option, "-XX:", &tail)) { 4164 logOption(tail); 4165 } 4166 } 4167 } 4168 4169 bool Arguments::handle_deprecated_print_gc_flags() { 4170 if (PrintGC) { 4171 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4172 } 4173 if (PrintGCDetails) { 4174 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4175 } 4176 4177 if (_gc_log_filename != NULL) { 4178 // -Xloggc was used to specify a filename 4179 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4180 4181 LogTarget(Error, logging) target; 4182 LogStreamCHeap errstream(target); 4183 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4184 } else if (PrintGC || PrintGCDetails) { 4185 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4186 } 4187 return true; 4188 } 4189 4190 // Parse entry point called from JNI_CreateJavaVM 4191 4192 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4193 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4194 4195 // Initialize ranges, constraints and writeables 4196 CommandLineFlagRangeList::init(); 4197 CommandLineFlagConstraintList::init(); 4198 CommandLineFlagWriteableList::init(); 4199 4200 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4201 const char* hotspotrc = ".hotspotrc"; 4202 bool settings_file_specified = false; 4203 bool needs_hotspotrc_warning = false; 4204 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4205 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4206 4207 // Pointers to current working set of containers 4208 JavaVMInitArgs* cur_cmd_args; 4209 JavaVMInitArgs* cur_java_options_args; 4210 JavaVMInitArgs* cur_java_tool_options_args; 4211 4212 // Containers for modified/expanded options 4213 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4214 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4215 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4216 4217 4218 jint code = 4219 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4220 if (code != JNI_OK) { 4221 return code; 4222 } 4223 4224 code = parse_java_options_environment_variable(&initial_java_options_args); 4225 if (code != JNI_OK) { 4226 return code; 4227 } 4228 4229 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4230 &mod_java_tool_options_args, 4231 &cur_java_tool_options_args); 4232 if (code != JNI_OK) { 4233 return code; 4234 } 4235 4236 code = expand_vm_options_as_needed(initial_cmd_args, 4237 &mod_cmd_args, 4238 &cur_cmd_args); 4239 if (code != JNI_OK) { 4240 return code; 4241 } 4242 4243 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4244 &mod_java_options_args, 4245 &cur_java_options_args); 4246 if (code != JNI_OK) { 4247 return code; 4248 } 4249 4250 const char* flags_file = Arguments::get_jvm_flags_file(); 4251 settings_file_specified = (flags_file != NULL); 4252 4253 if (IgnoreUnrecognizedVMOptions) { 4254 cur_cmd_args->ignoreUnrecognized = true; 4255 cur_java_tool_options_args->ignoreUnrecognized = true; 4256 cur_java_options_args->ignoreUnrecognized = true; 4257 } 4258 4259 // Parse specified settings file 4260 if (settings_file_specified) { 4261 if (!process_settings_file(flags_file, true, 4262 cur_cmd_args->ignoreUnrecognized)) { 4263 return JNI_EINVAL; 4264 } 4265 } else { 4266 #ifdef ASSERT 4267 // Parse default .hotspotrc settings file 4268 if (!process_settings_file(".hotspotrc", false, 4269 cur_cmd_args->ignoreUnrecognized)) { 4270 return JNI_EINVAL; 4271 } 4272 #else 4273 struct stat buf; 4274 if (os::stat(hotspotrc, &buf) == 0) { 4275 needs_hotspotrc_warning = true; 4276 } 4277 #endif 4278 } 4279 4280 if (PrintVMOptions) { 4281 print_options(cur_java_tool_options_args); 4282 print_options(cur_cmd_args); 4283 print_options(cur_java_options_args); 4284 } 4285 4286 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4287 jint result = parse_vm_init_args(cur_java_tool_options_args, 4288 cur_java_options_args, 4289 cur_cmd_args); 4290 4291 if (result != JNI_OK) { 4292 return result; 4293 } 4294 4295 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4296 SharedArchivePath = get_shared_archive_path(); 4297 if (SharedArchivePath == NULL) { 4298 return JNI_ENOMEM; 4299 } 4300 4301 // Set up VerifySharedSpaces 4302 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4303 VerifySharedSpaces = true; 4304 } 4305 4306 // Delay warning until here so that we've had a chance to process 4307 // the -XX:-PrintWarnings flag 4308 if (needs_hotspotrc_warning) { 4309 warning("%s file is present but has been ignored. " 4310 "Run with -XX:Flags=%s to load the file.", 4311 hotspotrc, hotspotrc); 4312 } 4313 4314 if (needs_module_property_warning) { 4315 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4316 " names that are reserved for internal use."); 4317 } 4318 4319 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4320 UNSUPPORTED_OPTION(UseLargePages); 4321 #endif 4322 4323 ArgumentsExt::report_unsupported_options(); 4324 4325 #ifndef PRODUCT 4326 if (TraceBytecodesAt != 0) { 4327 TraceBytecodes = true; 4328 } 4329 if (CountCompiledCalls) { 4330 if (UseCounterDecay) { 4331 warning("UseCounterDecay disabled because CountCalls is set"); 4332 UseCounterDecay = false; 4333 } 4334 } 4335 #endif // PRODUCT 4336 4337 if (ScavengeRootsInCode == 0) { 4338 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4339 warning("Forcing ScavengeRootsInCode non-zero"); 4340 } 4341 ScavengeRootsInCode = 1; 4342 } 4343 4344 if (!handle_deprecated_print_gc_flags()) { 4345 return JNI_EINVAL; 4346 } 4347 4348 // Set object alignment values. 4349 set_object_alignment(); 4350 4351 #if !INCLUDE_CDS 4352 if (DumpSharedSpaces || RequireSharedSpaces) { 4353 jio_fprintf(defaultStream::error_stream(), 4354 "Shared spaces are not supported in this VM\n"); 4355 return JNI_ERR; 4356 } 4357 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4358 warning("Shared spaces are not supported in this VM"); 4359 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4360 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4361 } 4362 no_shared_spaces("CDS Disabled"); 4363 #endif // INCLUDE_CDS 4364 4365 return JNI_OK; 4366 } 4367 4368 jint Arguments::apply_ergo() { 4369 4370 // Set flags based on ergonomics. 4371 set_ergonomics_flags(); 4372 4373 set_shared_spaces_flags(); 4374 4375 // Check the GC selections again. 4376 if (!check_gc_consistency()) { 4377 return JNI_EINVAL; 4378 } 4379 4380 if (TieredCompilation) { 4381 set_tiered_flags(); 4382 } else { 4383 int max_compilation_policy_choice = 1; 4384 #ifdef COMPILER2 4385 max_compilation_policy_choice = 2; 4386 #endif 4387 // Check if the policy is valid. 4388 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4389 vm_exit_during_initialization( 4390 "Incompatible compilation policy selected", NULL); 4391 } 4392 // Scale CompileThreshold 4393 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4394 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4395 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4396 } 4397 } 4398 4399 #ifdef COMPILER2 4400 #ifndef PRODUCT 4401 if (PrintIdealGraphLevel > 0) { 4402 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4403 } 4404 #endif 4405 #endif 4406 4407 // Set heap size based on available physical memory 4408 set_heap_size(); 4409 4410 ArgumentsExt::set_gc_specific_flags(); 4411 4412 // Initialize Metaspace flags and alignments 4413 Metaspace::ergo_initialize(); 4414 4415 // Set bytecode rewriting flags 4416 set_bytecode_flags(); 4417 4418 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4419 jint code = set_aggressive_opts_flags(); 4420 if (code != JNI_OK) { 4421 return code; 4422 } 4423 4424 // Turn off biased locking for locking debug mode flags, 4425 // which are subtly different from each other but neither works with 4426 // biased locking 4427 if (UseHeavyMonitors 4428 #ifdef COMPILER1 4429 || !UseFastLocking 4430 #endif // COMPILER1 4431 #if INCLUDE_JVMCI 4432 || !JVMCIUseFastLocking 4433 #endif 4434 ) { 4435 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4436 // flag set to true on command line; warn the user that they 4437 // can't enable biased locking here 4438 warning("Biased Locking is not supported with locking debug flags" 4439 "; ignoring UseBiasedLocking flag." ); 4440 } 4441 UseBiasedLocking = false; 4442 } 4443 4444 #ifdef CC_INTERP 4445 // Clear flags not supported on zero. 4446 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4447 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4448 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4449 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4450 #endif // CC_INTERP 4451 4452 #ifdef COMPILER2 4453 if (!EliminateLocks) { 4454 EliminateNestedLocks = false; 4455 } 4456 if (!Inline) { 4457 IncrementalInline = false; 4458 } 4459 #ifndef PRODUCT 4460 if (!IncrementalInline) { 4461 AlwaysIncrementalInline = false; 4462 } 4463 #endif 4464 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4465 // nothing to use the profiling, turn if off 4466 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4467 } 4468 #endif 4469 4470 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4471 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4472 DebugNonSafepoints = true; 4473 } 4474 4475 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4476 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4477 } 4478 4479 if (UseOnStackReplacement && !UseLoopCounter) { 4480 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4481 FLAG_SET_DEFAULT(UseLoopCounter, true); 4482 } 4483 4484 #ifndef PRODUCT 4485 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4486 if (use_vm_log()) { 4487 LogVMOutput = true; 4488 } 4489 } 4490 #endif // PRODUCT 4491 4492 if (PrintCommandLineFlags) { 4493 CommandLineFlags::printSetFlags(tty); 4494 } 4495 4496 // Apply CPU specific policy for the BiasedLocking 4497 if (UseBiasedLocking) { 4498 if (!VM_Version::use_biased_locking() && 4499 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4500 UseBiasedLocking = false; 4501 } 4502 } 4503 #ifdef COMPILER2 4504 if (!UseBiasedLocking || EmitSync != 0) { 4505 UseOptoBiasInlining = false; 4506 } 4507 #endif 4508 4509 return JNI_OK; 4510 } 4511 4512 jint Arguments::adjust_after_os() { 4513 if (UseNUMA) { 4514 if (UseParallelGC || UseParallelOldGC) { 4515 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4516 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4517 } 4518 } 4519 // UseNUMAInterleaving is set to ON for all collectors and 4520 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4521 // such as the parallel collector for Linux and Solaris will 4522 // interleave old gen and survivor spaces on top of NUMA 4523 // allocation policy for the eden space. 4524 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4525 // all platforms and ParallelGC on Windows will interleave all 4526 // of the heap spaces across NUMA nodes. 4527 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4528 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4529 } 4530 } 4531 return JNI_OK; 4532 } 4533 4534 int Arguments::PropertyList_count(SystemProperty* pl) { 4535 int count = 0; 4536 while(pl != NULL) { 4537 count++; 4538 pl = pl->next(); 4539 } 4540 return count; 4541 } 4542 4543 // Return the number of readable properties. 4544 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4545 int count = 0; 4546 while(pl != NULL) { 4547 if (pl->is_readable()) { 4548 count++; 4549 } 4550 pl = pl->next(); 4551 } 4552 return count; 4553 } 4554 4555 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4556 assert(key != NULL, "just checking"); 4557 SystemProperty* prop; 4558 for (prop = pl; prop != NULL; prop = prop->next()) { 4559 if (strcmp(key, prop->key()) == 0) return prop->value(); 4560 } 4561 return NULL; 4562 } 4563 4564 // Return the value of the requested property provided that it is a readable property. 4565 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4566 assert(key != NULL, "just checking"); 4567 SystemProperty* prop; 4568 // Return the property value if the keys match and the property is not internal or 4569 // it's the special internal property "jdk.boot.class.path.append". 4570 for (prop = pl; prop != NULL; prop = prop->next()) { 4571 if (strcmp(key, prop->key()) == 0) { 4572 if (!prop->internal()) { 4573 return prop->value(); 4574 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4575 return prop->value(); 4576 } else { 4577 // Property is internal and not jdk.boot.class.path.append so return NULL. 4578 return NULL; 4579 } 4580 } 4581 } 4582 return NULL; 4583 } 4584 4585 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4586 int count = 0; 4587 const char* ret_val = NULL; 4588 4589 while(pl != NULL) { 4590 if(count >= index) { 4591 ret_val = pl->key(); 4592 break; 4593 } 4594 count++; 4595 pl = pl->next(); 4596 } 4597 4598 return ret_val; 4599 } 4600 4601 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4602 int count = 0; 4603 char* ret_val = NULL; 4604 4605 while(pl != NULL) { 4606 if(count >= index) { 4607 ret_val = pl->value(); 4608 break; 4609 } 4610 count++; 4611 pl = pl->next(); 4612 } 4613 4614 return ret_val; 4615 } 4616 4617 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4618 SystemProperty* p = *plist; 4619 if (p == NULL) { 4620 *plist = new_p; 4621 } else { 4622 while (p->next() != NULL) { 4623 p = p->next(); 4624 } 4625 p->set_next(new_p); 4626 } 4627 } 4628 4629 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4630 bool writeable, bool internal) { 4631 if (plist == NULL) 4632 return; 4633 4634 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4635 PropertyList_add(plist, new_p); 4636 } 4637 4638 void Arguments::PropertyList_add(SystemProperty *element) { 4639 PropertyList_add(&_system_properties, element); 4640 } 4641 4642 // This add maintains unique property key in the list. 4643 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4644 PropertyAppendable append, PropertyWriteable writeable, 4645 PropertyInternal internal) { 4646 if (plist == NULL) 4647 return; 4648 4649 // If property key exist then update with new value. 4650 SystemProperty* prop; 4651 for (prop = *plist; prop != NULL; prop = prop->next()) { 4652 if (strcmp(k, prop->key()) == 0) { 4653 if (append == AppendProperty) { 4654 prop->append_value(v); 4655 } else { 4656 prop->set_value(v); 4657 } 4658 return; 4659 } 4660 } 4661 4662 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4663 } 4664 4665 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4666 // Returns true if all of the source pointed by src has been copied over to 4667 // the destination buffer pointed by buf. Otherwise, returns false. 4668 // Notes: 4669 // 1. If the length (buflen) of the destination buffer excluding the 4670 // NULL terminator character is not long enough for holding the expanded 4671 // pid characters, it also returns false instead of returning the partially 4672 // expanded one. 4673 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4674 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4675 char* buf, size_t buflen) { 4676 const char* p = src; 4677 char* b = buf; 4678 const char* src_end = &src[srclen]; 4679 char* buf_end = &buf[buflen - 1]; 4680 4681 while (p < src_end && b < buf_end) { 4682 if (*p == '%') { 4683 switch (*(++p)) { 4684 case '%': // "%%" ==> "%" 4685 *b++ = *p++; 4686 break; 4687 case 'p': { // "%p" ==> current process id 4688 // buf_end points to the character before the last character so 4689 // that we could write '\0' to the end of the buffer. 4690 size_t buf_sz = buf_end - b + 1; 4691 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4692 4693 // if jio_snprintf fails or the buffer is not long enough to hold 4694 // the expanded pid, returns false. 4695 if (ret < 0 || ret >= (int)buf_sz) { 4696 return false; 4697 } else { 4698 b += ret; 4699 assert(*b == '\0', "fail in copy_expand_pid"); 4700 if (p == src_end && b == buf_end + 1) { 4701 // reach the end of the buffer. 4702 return true; 4703 } 4704 } 4705 p++; 4706 break; 4707 } 4708 default : 4709 *b++ = '%'; 4710 } 4711 } else { 4712 *b++ = *p++; 4713 } 4714 } 4715 *b = '\0'; 4716 return (p == src_end); // return false if not all of the source was copied 4717 }