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/moduleEntry.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "code/codeCacheExtensions.hpp" 32 #include "gc/shared/cardTableRS.hpp" 33 #include "gc/shared/genCollectedHeap.hpp" 34 #include "gc/shared/referenceProcessor.hpp" 35 #include "gc/shared/taskqueue.hpp" 36 #include "logging/log.hpp" 37 #include "logging/logConfiguration.hpp" 38 #include "logging/logStream.hpp" 39 #include "logging/logTag.hpp" 40 #include "memory/allocation.inline.hpp" 41 #include "memory/universe.inline.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "prims/jvmtiExport.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/arguments_ext.hpp" 46 #include "runtime/commandLineFlagConstraintList.hpp" 47 #include "runtime/commandLineFlagWriteableList.hpp" 48 #include "runtime/commandLineFlagRangeList.hpp" 49 #include "runtime/globals.hpp" 50 #include "runtime/globals_extension.hpp" 51 #include "runtime/java.hpp" 52 #include "runtime/os.hpp" 53 #include "runtime/vm_version.hpp" 54 #include "services/management.hpp" 55 #include "services/memTracker.hpp" 56 #include "utilities/defaultStream.hpp" 57 #include "utilities/macros.hpp" 58 #include "utilities/stringUtils.hpp" 59 #if INCLUDE_JVMCI 60 #include "jvmci/jvmciRuntime.hpp" 61 #endif 62 #if INCLUDE_ALL_GCS 63 #include "gc/cms/compactibleFreeListSpace.hpp" 64 #include "gc/g1/g1CollectedHeap.inline.hpp" 65 #include "gc/parallel/parallelScavengeHeap.hpp" 66 #endif // INCLUDE_ALL_GCS 67 68 // Note: This is a special bug reporting site for the JVM 69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 70 #define DEFAULT_JAVA_LAUNCHER "generic" 71 72 char* Arguments::_jvm_flags_file = NULL; 73 char** Arguments::_jvm_flags_array = NULL; 74 int Arguments::_num_jvm_flags = 0; 75 char** Arguments::_jvm_args_array = NULL; 76 int Arguments::_num_jvm_args = 0; 77 char* Arguments::_java_command = NULL; 78 SystemProperty* Arguments::_system_properties = NULL; 79 const char* Arguments::_gc_log_filename = NULL; 80 bool Arguments::_has_profile = false; 81 size_t Arguments::_conservative_max_heap_alignment = 0; 82 size_t Arguments::_min_heap_size = 0; 83 Arguments::Mode Arguments::_mode = _mixed; 84 bool Arguments::_java_compiler = false; 85 bool Arguments::_xdebug_mode = false; 86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 88 int Arguments::_sun_java_launcher_pid = -1; 89 bool Arguments::_sun_java_launcher_is_altjvm = false; 90 91 // These parameters are reset in method parse_vm_init_args() 92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 94 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 95 bool Arguments::_ClipInlining = ClipInlining; 96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 98 99 char* Arguments::SharedArchivePath = NULL; 100 101 AgentLibraryList Arguments::_libraryList; 102 AgentLibraryList Arguments::_agentList; 103 104 abort_hook_t Arguments::_abort_hook = NULL; 105 exit_hook_t Arguments::_exit_hook = NULL; 106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 107 108 109 SystemProperty *Arguments::_sun_boot_library_path = NULL; 110 SystemProperty *Arguments::_java_library_path = NULL; 111 SystemProperty *Arguments::_java_home = NULL; 112 SystemProperty *Arguments::_java_class_path = NULL; 113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 114 115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 116 PathString *Arguments::_system_boot_class_path = NULL; 117 bool Arguments::_has_jimage = false; 118 119 char* Arguments::_ext_dirs = NULL; 120 121 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 122 // part of the option string. 123 static bool match_option(const JavaVMOption *option, const char* name, 124 const char** tail) { 125 size_t len = strlen(name); 126 if (strncmp(option->optionString, name, len) == 0) { 127 *tail = option->optionString + len; 128 return true; 129 } else { 130 return false; 131 } 132 } 133 134 // Check if 'option' matches 'name'. No "tail" is allowed. 135 static bool match_option(const JavaVMOption *option, const char* name) { 136 const char* tail = NULL; 137 bool result = match_option(option, name, &tail); 138 if (tail != NULL && *tail == '\0') { 139 return result; 140 } else { 141 return false; 142 } 143 } 144 145 // Return true if any of the strings in null-terminated array 'names' matches. 146 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 147 // the option must match exactly. 148 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 149 bool tail_allowed) { 150 for (/* empty */; *names != NULL; ++names) { 151 if (match_option(option, *names, tail)) { 152 if (**tail == '\0' || tail_allowed && **tail == ':') { 153 return true; 154 } 155 } 156 } 157 return false; 158 } 159 160 static void logOption(const char* opt) { 161 if (PrintVMOptions) { 162 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 163 } 164 } 165 166 bool needs_module_property_warning = false; 167 168 #define MODULE_PROPERTY_PREFIX "jdk.module." 169 #define MODULE_PROPERTY_PREFIX_LEN 11 170 #define ADDEXPORTS "addexports" 171 #define ADDEXPORTS_LEN 10 172 #define ADDREADS "addreads" 173 #define ADDREADS_LEN 8 174 #define PATCH "patch" 175 #define PATCH_LEN 5 176 #define ADDMODS "addmods" 177 #define ADDMODS_LEN 7 178 #define LIMITMODS "limitmods" 179 #define LIMITMODS_LEN 9 180 #define PATH "path" 181 #define PATH_LEN 4 182 #define UPGRADE_PATH "upgrade.path" 183 #define UPGRADE_PATH_LEN 12 184 185 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 186 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 187 return ((strncmp(option, property, len) == 0) && 188 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 189 } 190 191 // Return true if property starts with "jdk.module." and its ensuing chars match 192 // any of the reserved module properties. 193 // property should be passed without the leading "-D". 194 bool Arguments::is_internal_module_property(const char* property) { 195 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 196 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 197 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 198 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 199 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 200 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 201 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 202 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 203 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 204 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 205 return true; 206 } 207 } 208 return false; 209 } 210 211 // Process java launcher properties. 212 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 213 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 214 // sun.java.launcher.pid is defined. 215 // Must do this before setting up other system properties, 216 // as some of them may depend on launcher type. 217 for (int index = 0; index < args->nOptions; index++) { 218 const JavaVMOption* option = args->options + index; 219 const char* tail; 220 221 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 222 process_java_launcher_argument(tail, option->extraInfo); 223 continue; 224 } 225 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 226 if (strcmp(tail, "true") == 0) { 227 _sun_java_launcher_is_altjvm = true; 228 } 229 continue; 230 } 231 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 232 _sun_java_launcher_pid = atoi(tail); 233 continue; 234 } 235 } 236 } 237 238 // Initialize system properties key and value. 239 void Arguments::init_system_properties() { 240 241 // Set up _system_boot_class_path which is not a property but 242 // relies heavily on argument processing and the jdk.boot.class.path.append 243 // property. It is used to store the underlying system boot class path. 244 _system_boot_class_path = new PathString(NULL); 245 246 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 247 "Java Virtual Machine Specification", false)); 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 251 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 252 253 // Following are JVMTI agent writable properties. 254 // Properties values are set to NULL and they are 255 // os specific they are initialized in os::init_system_properties_values(). 256 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 257 _java_library_path = new SystemProperty("java.library.path", NULL, true); 258 _java_home = new SystemProperty("java.home", NULL, true); 259 _java_class_path = new SystemProperty("java.class.path", "", true); 260 // jdk.boot.class.path.append is a non-writeable, internal property. 261 // It can only be set by either: 262 // - -Xbootclasspath/a: 263 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 264 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 265 266 // Add to System Property list. 267 PropertyList_add(&_system_properties, _sun_boot_library_path); 268 PropertyList_add(&_system_properties, _java_library_path); 269 PropertyList_add(&_system_properties, _java_home); 270 PropertyList_add(&_system_properties, _java_class_path); 271 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 272 273 // Set OS specific system properties values 274 os::init_system_properties_values(); 275 } 276 277 // Update/Initialize System properties after JDK version number is known 278 void Arguments::init_version_specific_system_properties() { 279 enum { bufsz = 16 }; 280 char buffer[bufsz]; 281 const char* spec_vendor = "Oracle Corporation"; 282 uint32_t spec_version = JDK_Version::current().major_version(); 283 284 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 285 286 PropertyList_add(&_system_properties, 287 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 288 PropertyList_add(&_system_properties, 289 new SystemProperty("java.vm.specification.version", buffer, false)); 290 PropertyList_add(&_system_properties, 291 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 292 } 293 294 /* 295 * -XX argument processing: 296 * 297 * -XX arguments are defined in several places, such as: 298 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 299 * -XX arguments are parsed in parse_argument(). 300 * -XX argument bounds checking is done in check_vm_args_consistency(). 301 * 302 * Over time -XX arguments may change. There are mechanisms to handle common cases: 303 * 304 * ALIASED: An option that is simply another name for another option. This is often 305 * part of the process of deprecating a flag, but not all aliases need 306 * to be deprecated. 307 * 308 * Create an alias for an option by adding the old and new option names to the 309 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 310 * 311 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 312 * support may be removed in the future. Both regular and aliased options may be 313 * deprecated. 314 * 315 * Add a deprecation warning for an option (or alias) by adding an entry in the 316 * "special_jvm_flags" table and setting the "deprecated_in" field. 317 * Often an option "deprecated" in one major release will 318 * be made "obsolete" in the next. In this case the entry should also have it's 319 * "obsolete_in" field set. 320 * 321 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 322 * on the command line. A warning is printed to let the user know that option might not 323 * be accepted in the future. 324 * 325 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 326 * table and setting the "obsolete_in" field. 327 * 328 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 329 * to the current JDK version. The system will flatly refuse to admit the existence of 330 * the flag. This allows a flag to die automatically over JDK releases. 331 * 332 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 333 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 334 * - Newly obsolete or expired deprecated options should have their global variable 335 * definitions removed (from globals.hpp, etc) and related implementations removed. 336 * 337 * Recommended approach for removing options: 338 * 339 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 340 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 341 * 342 * To remove internal options (e.g. diagnostic, experimental, develop options), use 343 * a 2-step model adding major release numbers to the obsolete and expire columns. 344 * 345 * To change the name of an option, use the alias table as well as a 2-step 346 * model adding major release numbers to the deprecate and expire columns. 347 * Think twice about aliasing commonly used customer options. 348 * 349 * There are times when it is appropriate to leave a future release number as undefined. 350 * 351 * Tests: Aliases should be tested in VMAliasOptions.java. 352 * Deprecated options should be tested in VMDeprecatedOptions.java. 353 */ 354 355 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 356 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 357 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 358 // the command-line as usual, but will issue a warning. 359 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 360 // the command-line, while issuing a warning and ignoring the flag value. 361 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 362 // existence of the flag. 363 // 364 // MANUAL CLEANUP ON JDK VERSION UPDATES: 365 // This table ensures that the handling of options will update automatically when the JDK 366 // version is incremented, but the source code needs to be cleanup up manually: 367 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 368 // variable should be removed, as well as users of the variable. 369 // - As "deprecated" options age into "obsolete" options, move the entry into the 370 // "Obsolete Flags" section of the table. 371 // - All expired options should be removed from the table. 372 static SpecialFlag const special_jvm_flags[] = { 373 // -------------- Deprecated Flags -------------- 374 // --- Non-alias flags - sorted by obsolete_in then expired_in: 375 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 376 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 377 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 378 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 379 { "ExplicitGCInvokesConcurrentAndUnloadsClasses", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 380 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 381 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 382 383 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 384 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 385 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 386 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 387 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 388 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 389 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 390 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 391 392 // -------------- Obsolete Flags - sorted by expired_in -------------- 393 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 394 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 395 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 396 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 397 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 398 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 399 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 400 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 401 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 402 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 403 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 404 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 405 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 406 #ifndef ZERO 407 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 408 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 409 #endif // ZERO 410 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 411 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 412 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 413 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 414 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 415 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 416 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 417 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 418 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 419 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 420 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 421 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) }, 422 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) }, 423 424 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 425 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 426 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 427 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 428 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 429 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 430 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 431 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 432 #endif 433 434 { NULL, JDK_Version(0), JDK_Version(0) } 435 }; 436 437 // Flags that are aliases for other flags. 438 typedef struct { 439 const char* alias_name; 440 const char* real_name; 441 } AliasedFlag; 442 443 static AliasedFlag const aliased_jvm_flags[] = { 444 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 445 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 446 { "CMSMarkStackSize", "MarkStackSize" }, 447 { "G1MarkStackSize", "MarkStackSize" }, 448 { "ParallelMarkingThreads", "ConcGCThreads" }, 449 { "ParallelCMSThreads", "ConcGCThreads" }, 450 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 451 { NULL, NULL} 452 }; 453 454 // NOTE: A compatibility request will be necessary for each alias to be removed. 455 static AliasedLoggingFlag const aliased_logging_flags[] = { 456 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 457 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 458 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 459 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 460 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 461 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 462 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 463 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 464 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 465 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 466 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 467 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 468 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 469 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 470 }; 471 472 #ifndef PRODUCT 473 // These options are removed in jdk9. Remove this code for jdk10. 474 static AliasedFlag const removed_develop_logging_flags[] = { 475 { "TraceClassInitialization", "-Xlog:class+init" }, 476 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 477 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 478 { "TraceItables", "-Xlog:itables=debug" }, 479 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 480 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 481 { "TraceStartupTime", "-Xlog:startuptime" }, 482 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 483 { "PrintVtables", "-Xlog:vtables=debug" }, 484 { "VerboseVerification", "-Xlog:verification" }, 485 { NULL, NULL } 486 }; 487 #endif //PRODUCT 488 489 // Return true if "v" is less than "other", where "other" may be "undefined". 490 static bool version_less_than(JDK_Version v, JDK_Version other) { 491 assert(!v.is_undefined(), "must be defined"); 492 if (!other.is_undefined() && v.compare(other) >= 0) { 493 return false; 494 } else { 495 return true; 496 } 497 } 498 499 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 500 501 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 502 // Allow extensions to have priority 503 if (lookup_special_flag_ext(flag_name, flag)) { 504 return true; 505 } 506 507 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 508 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 509 flag = special_jvm_flags[i]; 510 return true; 511 } 512 } 513 return false; 514 } 515 516 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 517 assert(version != NULL, "Must provide a version buffer"); 518 SpecialFlag flag; 519 if (lookup_special_flag(flag_name, flag)) { 520 if (!flag.obsolete_in.is_undefined()) { 521 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 522 *version = flag.obsolete_in; 523 return true; 524 } 525 } 526 } 527 return false; 528 } 529 530 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 531 assert(version != NULL, "Must provide a version buffer"); 532 SpecialFlag flag; 533 if (lookup_special_flag(flag_name, flag)) { 534 if (!flag.deprecated_in.is_undefined()) { 535 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 536 version_less_than(JDK_Version::current(), flag.expired_in)) { 537 *version = flag.deprecated_in; 538 return 1; 539 } else { 540 return -1; 541 } 542 } 543 } 544 return 0; 545 } 546 547 #ifndef PRODUCT 548 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 549 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 550 const AliasedFlag& flag = removed_develop_logging_flags[i]; 551 if (strcmp(flag.alias_name, name) == 0) { 552 return flag.real_name; 553 } 554 } 555 return NULL; 556 } 557 #endif // PRODUCT 558 559 const char* Arguments::real_flag_name(const char *flag_name) { 560 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 561 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 562 if (strcmp(flag_status.alias_name, flag_name) == 0) { 563 return flag_status.real_name; 564 } 565 } 566 return flag_name; 567 } 568 569 #ifdef ASSERT 570 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 571 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 572 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 573 return true; 574 } 575 } 576 return false; 577 } 578 579 static bool verify_special_jvm_flags() { 580 bool success = true; 581 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 582 const SpecialFlag& flag = special_jvm_flags[i]; 583 if (lookup_special_flag(flag.name, i)) { 584 warning("Duplicate special flag declaration \"%s\"", flag.name); 585 success = false; 586 } 587 if (flag.deprecated_in.is_undefined() && 588 flag.obsolete_in.is_undefined()) { 589 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 590 success = false; 591 } 592 593 if (!flag.deprecated_in.is_undefined()) { 594 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 595 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 596 success = false; 597 } 598 599 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 600 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 601 success = false; 602 } 603 } 604 605 if (!flag.obsolete_in.is_undefined()) { 606 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 607 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 608 success = false; 609 } 610 611 // if flag has become obsolete it should not have a "globals" flag defined anymore. 612 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 613 if (Flag::find_flag(flag.name) != NULL) { 614 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 615 success = false; 616 } 617 } 618 } 619 620 if (!flag.expired_in.is_undefined()) { 621 // if flag has become expired it should not have a "globals" flag defined anymore. 622 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 623 if (Flag::find_flag(flag.name) != NULL) { 624 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 625 success = false; 626 } 627 } 628 } 629 630 } 631 return success; 632 } 633 #endif 634 635 // Parses a size specification string. 636 bool Arguments::atojulong(const char *s, julong* result) { 637 julong n = 0; 638 639 // First char must be a digit. Don't allow negative numbers or leading spaces. 640 if (!isdigit(*s)) { 641 return false; 642 } 643 644 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 645 char* remainder; 646 errno = 0; 647 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 648 if (errno != 0) { 649 return false; 650 } 651 652 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 653 if (remainder == s || strlen(remainder) > 1) { 654 return false; 655 } 656 657 switch (*remainder) { 658 case 'T': case 't': 659 *result = n * G * K; 660 // Check for overflow. 661 if (*result/((julong)G * K) != n) return false; 662 return true; 663 case 'G': case 'g': 664 *result = n * G; 665 if (*result/G != n) return false; 666 return true; 667 case 'M': case 'm': 668 *result = n * M; 669 if (*result/M != n) return false; 670 return true; 671 case 'K': case 'k': 672 *result = n * K; 673 if (*result/K != n) return false; 674 return true; 675 case '\0': 676 *result = n; 677 return true; 678 default: 679 return false; 680 } 681 } 682 683 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 684 if (size < min_size) return arg_too_small; 685 // Check that size will fit in a size_t (only relevant on 32-bit) 686 if (size > max_uintx) return arg_too_big; 687 return arg_in_range; 688 } 689 690 // Describe an argument out of range error 691 void Arguments::describe_range_error(ArgsRange errcode) { 692 switch(errcode) { 693 case arg_too_big: 694 jio_fprintf(defaultStream::error_stream(), 695 "The specified size exceeds the maximum " 696 "representable size.\n"); 697 break; 698 case arg_too_small: 699 case arg_unreadable: 700 case arg_in_range: 701 // do nothing for now 702 break; 703 default: 704 ShouldNotReachHere(); 705 } 706 } 707 708 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 709 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 710 return true; 711 } else { 712 return false; 713 } 714 } 715 716 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 717 char* end; 718 errno = 0; 719 double v = strtod(value, &end); 720 if ((errno != 0) || (*end != 0)) { 721 return false; 722 } 723 724 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 725 return true; 726 } 727 return false; 728 } 729 730 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 731 julong v; 732 int int_v; 733 intx intx_v; 734 bool is_neg = false; 735 Flag* result = Flag::find_flag(name, strlen(name)); 736 737 if (result == NULL) { 738 return false; 739 } 740 741 // Check the sign first since atojulong() parses only unsigned values. 742 if (*value == '-') { 743 if (!result->is_intx() && !result->is_int()) { 744 return false; 745 } 746 value++; 747 is_neg = true; 748 } 749 if (!Arguments::atojulong(value, &v)) { 750 return false; 751 } 752 if (result->is_int()) { 753 int_v = (int) v; 754 if (is_neg) { 755 int_v = -int_v; 756 } 757 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 758 } else if (result->is_uint()) { 759 uint uint_v = (uint) v; 760 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 761 } else if (result->is_intx()) { 762 intx_v = (intx) v; 763 if (is_neg) { 764 intx_v = -intx_v; 765 } 766 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 767 } else if (result->is_uintx()) { 768 uintx uintx_v = (uintx) v; 769 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 770 } else if (result->is_uint64_t()) { 771 uint64_t uint64_t_v = (uint64_t) v; 772 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 773 } else if (result->is_size_t()) { 774 size_t size_t_v = (size_t) v; 775 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 776 } else { 777 return false; 778 } 779 } 780 781 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 782 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 783 // Contract: CommandLineFlags always returns a pointer that needs freeing. 784 FREE_C_HEAP_ARRAY(char, value); 785 return true; 786 } 787 788 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 789 const char* old_value = ""; 790 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 791 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 792 size_t new_len = strlen(new_value); 793 const char* value; 794 char* free_this_too = NULL; 795 if (old_len == 0) { 796 value = new_value; 797 } else if (new_len == 0) { 798 value = old_value; 799 } else { 800 size_t length = old_len + 1 + new_len + 1; 801 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 802 // each new setting adds another LINE to the switch: 803 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 804 value = buf; 805 free_this_too = buf; 806 } 807 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 808 // CommandLineFlags always returns a pointer that needs freeing. 809 FREE_C_HEAP_ARRAY(char, value); 810 if (free_this_too != NULL) { 811 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 812 FREE_C_HEAP_ARRAY(char, free_this_too); 813 } 814 return true; 815 } 816 817 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 818 const char* real_name = real_flag_name(arg); 819 JDK_Version since = JDK_Version(); 820 switch (is_deprecated_flag(arg, &since)) { 821 case -1: 822 return NULL; // obsolete or expired, don't process normally 823 case 0: 824 return real_name; 825 case 1: { 826 if (warn) { 827 char version[256]; 828 since.to_string(version, sizeof(version)); 829 if (real_name != arg) { 830 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 831 arg, version, real_name); 832 } else { 833 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 834 arg, version); 835 } 836 } 837 return real_name; 838 } 839 } 840 ShouldNotReachHere(); 841 return NULL; 842 } 843 844 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 845 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 846 // Set tagset string buffer at max size of 256, large enough for any alias tagset 847 const int max_tagset_size = 256; 848 int max_tagset_len = max_tagset_size - 1; 849 char tagset_buffer[max_tagset_size]; 850 tagset_buffer[0] = '\0'; 851 852 // Write tag-set for aliased logging option, in string list form 853 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 854 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 855 if (i > 0) { 856 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 857 } 858 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 859 } 860 if (!alf.exactMatch) { 861 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 862 } 863 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 864 (on) ? "+" : "-", 865 name, 866 tagset_buffer, 867 (on) ? LogLevel::name(alf.level) : "off"); 868 } 869 870 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 871 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 872 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 873 if (strcmp(alf.alias_name, name) == 0) { 874 log_deprecated_flag(name, on, alf); 875 return alf; 876 } 877 } 878 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 879 return a; 880 } 881 882 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 883 884 // range of acceptable characters spelled out for portability reasons 885 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 886 #define BUFLEN 255 887 char name[BUFLEN+1]; 888 char dummy; 889 const char* real_name; 890 bool warn_if_deprecated = true; 891 892 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 893 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 894 if (alf.alias_name != NULL){ 895 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 896 return true; 897 } 898 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 899 if (real_name == NULL) { 900 return false; 901 } 902 return set_bool_flag(real_name, false, origin); 903 } 904 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 905 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 906 if (alf.alias_name != NULL){ 907 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 908 return true; 909 } 910 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 911 if (real_name == NULL) { 912 return false; 913 } 914 return set_bool_flag(real_name, true, origin); 915 } 916 917 char punct; 918 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 919 const char* value = strchr(arg, '=') + 1; 920 Flag* flag; 921 922 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 923 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 924 if (alf.alias_name != NULL) { 925 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 926 return true; 927 } 928 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 929 if (real_name == NULL) { 930 return false; 931 } 932 flag = Flag::find_flag(real_name); 933 if (flag != NULL && flag->is_ccstr()) { 934 if (flag->ccstr_accumulates()) { 935 return append_to_string_flag(real_name, value, origin); 936 } else { 937 if (value[0] == '\0') { 938 value = NULL; 939 } 940 return set_string_flag(real_name, value, origin); 941 } 942 } else { 943 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 944 } 945 } 946 947 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 948 const char* value = strchr(arg, '=') + 1; 949 // -XX:Foo:=xxx will reset the string flag to the given value. 950 if (value[0] == '\0') { 951 value = NULL; 952 } 953 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 954 if (real_name == NULL) { 955 return false; 956 } 957 return set_string_flag(real_name, value, origin); 958 } 959 960 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 961 #define SIGNED_NUMBER_RANGE "[-0123456789]" 962 #define NUMBER_RANGE "[0123456789eE+-]" 963 char value[BUFLEN + 1]; 964 char value2[BUFLEN + 1]; 965 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 966 // Looks like a floating-point number -- try again with more lenient format string 967 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 968 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 969 if (real_name == NULL) { 970 return false; 971 } 972 return set_fp_numeric_flag(real_name, value, origin); 973 } 974 } 975 976 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 977 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 978 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 979 if (real_name == NULL) { 980 return false; 981 } 982 return set_numeric_flag(real_name, value, origin); 983 } 984 985 return false; 986 } 987 988 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 989 assert(bldarray != NULL, "illegal argument"); 990 991 if (arg == NULL) { 992 return; 993 } 994 995 int new_count = *count + 1; 996 997 // expand the array and add arg to the last element 998 if (*bldarray == NULL) { 999 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1000 } else { 1001 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1002 } 1003 (*bldarray)[*count] = os::strdup_check_oom(arg); 1004 *count = new_count; 1005 } 1006 1007 void Arguments::build_jvm_args(const char* arg) { 1008 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1009 } 1010 1011 void Arguments::build_jvm_flags(const char* arg) { 1012 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1013 } 1014 1015 // utility function to return a string that concatenates all 1016 // strings in a given char** array 1017 const char* Arguments::build_resource_string(char** args, int count) { 1018 if (args == NULL || count == 0) { 1019 return NULL; 1020 } 1021 size_t length = 0; 1022 for (int i = 0; i < count; i++) { 1023 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1024 } 1025 char* s = NEW_RESOURCE_ARRAY(char, length); 1026 char* dst = s; 1027 for (int j = 0; j < count; j++) { 1028 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1029 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1030 dst += offset; 1031 length -= offset; 1032 } 1033 return (const char*) s; 1034 } 1035 1036 void Arguments::print_on(outputStream* st) { 1037 st->print_cr("VM Arguments:"); 1038 if (num_jvm_flags() > 0) { 1039 st->print("jvm_flags: "); print_jvm_flags_on(st); 1040 st->cr(); 1041 } 1042 if (num_jvm_args() > 0) { 1043 st->print("jvm_args: "); print_jvm_args_on(st); 1044 st->cr(); 1045 } 1046 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1047 if (_java_class_path != NULL) { 1048 char* path = _java_class_path->value(); 1049 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1050 } 1051 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1052 } 1053 1054 void Arguments::print_summary_on(outputStream* st) { 1055 // Print the command line. Environment variables that are helpful for 1056 // reproducing the problem are written later in the hs_err file. 1057 // flags are from setting file 1058 if (num_jvm_flags() > 0) { 1059 st->print_raw("Settings File: "); 1060 print_jvm_flags_on(st); 1061 st->cr(); 1062 } 1063 // args are the command line and environment variable arguments. 1064 st->print_raw("Command Line: "); 1065 if (num_jvm_args() > 0) { 1066 print_jvm_args_on(st); 1067 } 1068 // this is the classfile and any arguments to the java program 1069 if (java_command() != NULL) { 1070 st->print("%s", java_command()); 1071 } 1072 st->cr(); 1073 } 1074 1075 void Arguments::print_jvm_flags_on(outputStream* st) { 1076 if (_num_jvm_flags > 0) { 1077 for (int i=0; i < _num_jvm_flags; i++) { 1078 st->print("%s ", _jvm_flags_array[i]); 1079 } 1080 } 1081 } 1082 1083 void Arguments::print_jvm_args_on(outputStream* st) { 1084 if (_num_jvm_args > 0) { 1085 for (int i=0; i < _num_jvm_args; i++) { 1086 st->print("%s ", _jvm_args_array[i]); 1087 } 1088 } 1089 } 1090 1091 bool Arguments::process_argument(const char* arg, 1092 jboolean ignore_unrecognized, 1093 Flag::Flags origin) { 1094 JDK_Version since = JDK_Version(); 1095 1096 if (parse_argument(arg, origin)) { 1097 return true; 1098 } 1099 1100 // Determine if the flag has '+', '-', or '=' characters. 1101 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1102 const char* const argname = has_plus_minus ? arg + 1 : arg; 1103 1104 size_t arg_len; 1105 const char* equal_sign = strchr(argname, '='); 1106 if (equal_sign == NULL) { 1107 arg_len = strlen(argname); 1108 } else { 1109 arg_len = equal_sign - argname; 1110 } 1111 1112 // Only make the obsolete check for valid arguments. 1113 if (arg_len <= BUFLEN) { 1114 // Construct a string which consists only of the argument name without '+', '-', or '='. 1115 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1116 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1117 if (is_obsolete_flag(stripped_argname, &since)) { 1118 char version[256]; 1119 since.to_string(version, sizeof(version)); 1120 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1121 return true; 1122 } 1123 #ifndef PRODUCT 1124 else { 1125 const char* replacement; 1126 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1127 log_warning(arguments)("%s has been removed. Please use %s instead.", 1128 stripped_argname, 1129 replacement); 1130 return false; 1131 } 1132 } 1133 #endif //PRODUCT 1134 } 1135 1136 // For locked flags, report a custom error message if available. 1137 // Otherwise, report the standard unrecognized VM option. 1138 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1139 if (found_flag != NULL) { 1140 char locked_message_buf[BUFLEN]; 1141 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1142 if (strlen(locked_message_buf) == 0) { 1143 if (found_flag->is_bool() && !has_plus_minus) { 1144 jio_fprintf(defaultStream::error_stream(), 1145 "Missing +/- setting for VM option '%s'\n", argname); 1146 } else if (!found_flag->is_bool() && has_plus_minus) { 1147 jio_fprintf(defaultStream::error_stream(), 1148 "Unexpected +/- setting in VM option '%s'\n", argname); 1149 } else { 1150 jio_fprintf(defaultStream::error_stream(), 1151 "Improperly specified VM option '%s'\n", argname); 1152 } 1153 } else { 1154 #ifdef PRODUCT 1155 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1156 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1157 if (ignore_unrecognized && mismatched) { 1158 return true; 1159 } 1160 #endif 1161 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1162 } 1163 } else { 1164 if (ignore_unrecognized) { 1165 return true; 1166 } 1167 jio_fprintf(defaultStream::error_stream(), 1168 "Unrecognized VM option '%s'\n", argname); 1169 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1170 if (fuzzy_matched != NULL) { 1171 jio_fprintf(defaultStream::error_stream(), 1172 "Did you mean '%s%s%s'? ", 1173 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1174 fuzzy_matched->_name, 1175 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1176 } 1177 } 1178 1179 // allow for commandline "commenting out" options like -XX:#+Verbose 1180 return arg[0] == '#'; 1181 } 1182 1183 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1184 FILE* stream = fopen(file_name, "rb"); 1185 if (stream == NULL) { 1186 if (should_exist) { 1187 jio_fprintf(defaultStream::error_stream(), 1188 "Could not open settings file %s\n", file_name); 1189 return false; 1190 } else { 1191 return true; 1192 } 1193 } 1194 1195 char token[1024]; 1196 int pos = 0; 1197 1198 bool in_white_space = true; 1199 bool in_comment = false; 1200 bool in_quote = false; 1201 char quote_c = 0; 1202 bool result = true; 1203 1204 int c = getc(stream); 1205 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1206 if (in_white_space) { 1207 if (in_comment) { 1208 if (c == '\n') in_comment = false; 1209 } else { 1210 if (c == '#') in_comment = true; 1211 else if (!isspace(c)) { 1212 in_white_space = false; 1213 token[pos++] = c; 1214 } 1215 } 1216 } else { 1217 if (c == '\n' || (!in_quote && isspace(c))) { 1218 // token ends at newline, or at unquoted whitespace 1219 // this allows a way to include spaces in string-valued options 1220 token[pos] = '\0'; 1221 logOption(token); 1222 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1223 build_jvm_flags(token); 1224 pos = 0; 1225 in_white_space = true; 1226 in_quote = false; 1227 } else if (!in_quote && (c == '\'' || c == '"')) { 1228 in_quote = true; 1229 quote_c = c; 1230 } else if (in_quote && (c == quote_c)) { 1231 in_quote = false; 1232 } else { 1233 token[pos++] = c; 1234 } 1235 } 1236 c = getc(stream); 1237 } 1238 if (pos > 0) { 1239 token[pos] = '\0'; 1240 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1241 build_jvm_flags(token); 1242 } 1243 fclose(stream); 1244 return result; 1245 } 1246 1247 //============================================================================================================= 1248 // Parsing of properties (-D) 1249 1250 const char* Arguments::get_property(const char* key) { 1251 return PropertyList_get_value(system_properties(), key); 1252 } 1253 1254 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1255 const char* eq = strchr(prop, '='); 1256 const char* key; 1257 const char* value = ""; 1258 1259 if (eq == NULL) { 1260 // property doesn't have a value, thus use passed string 1261 key = prop; 1262 } else { 1263 // property have a value, thus extract it and save to the 1264 // allocated string 1265 size_t key_len = eq - prop; 1266 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1267 1268 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1269 key = tmp_key; 1270 1271 value = &prop[key_len + 1]; 1272 } 1273 1274 if (strcmp(key, "java.compiler") == 0) { 1275 process_java_compiler_argument(value); 1276 // Record value in Arguments, but let it get passed to Java. 1277 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1278 strcmp(key, "sun.java.launcher.pid") == 0) { 1279 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1280 // private and are processed in process_sun_java_launcher_properties(); 1281 // the sun.java.launcher property is passed on to the java application 1282 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1283 // append is true, writable is true, internal is false 1284 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1285 WriteableProperty, ExternalProperty); 1286 } else { 1287 if (strcmp(key, "sun.java.command") == 0) { 1288 char *old_java_command = _java_command; 1289 _java_command = os::strdup_check_oom(value, mtArguments); 1290 if (old_java_command != NULL) { 1291 os::free(old_java_command); 1292 } 1293 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1294 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1295 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1296 // its value without going through the property list or making a Java call. 1297 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1298 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1299 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1300 os::free((void *)old_java_vendor_url_bug); 1301 } 1302 } 1303 1304 // Create new property and add at the end of the list 1305 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1306 } 1307 1308 if (key != prop) { 1309 // SystemProperty copy passed value, thus free previously allocated 1310 // memory 1311 FreeHeap((void *)key); 1312 } 1313 1314 return true; 1315 } 1316 1317 #if INCLUDE_CDS 1318 void Arguments::check_unsupported_dumping_properties() { 1319 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1320 const char* unsupported_properties[] = { "jdk.module.main", 1321 "jdk.module.limitmods", 1322 "jdk.module.path", 1323 "jdk.module.upgrade.path", 1324 "jdk.module.addmods.0", 1325 "jdk.module.patch.0" }; 1326 const char* unsupported_options[] = { "-m", // cannot use at dump time 1327 "--limit-modules", // cannot use at dump time 1328 "--module-path", // ignored at dump time 1329 "--upgrade-module-path", // ignored at dump time 1330 "--add-modules", // ignored at dump time 1331 "--patch-module" // ignored at dump time 1332 }; 1333 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1334 // If a vm option is found in the unsupported_options array with index less than the warning_idx, 1335 // vm will exit with an error message. Otherwise, it will result in a warning message. 1336 uint warning_idx = 2; 1337 SystemProperty* sp = system_properties(); 1338 while (sp != NULL) { 1339 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1340 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1341 if (i < warning_idx) { 1342 vm_exit_during_initialization( 1343 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1344 } else { 1345 warning( 1346 "the %s option is ignored when dumping the shared archive", unsupported_options[i]); 1347 } 1348 } 1349 } 1350 sp = sp->next(); 1351 } 1352 1353 // Check for an exploded module build in use with -Xshare:dump. 1354 if (!has_jimage()) { 1355 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1356 } 1357 } 1358 #endif 1359 1360 //=========================================================================================================== 1361 // Setting int/mixed/comp mode flags 1362 1363 void Arguments::set_mode_flags(Mode mode) { 1364 // Set up default values for all flags. 1365 // If you add a flag to any of the branches below, 1366 // add a default value for it here. 1367 set_java_compiler(false); 1368 _mode = mode; 1369 1370 // Ensure Agent_OnLoad has the correct initial values. 1371 // This may not be the final mode; mode may change later in onload phase. 1372 PropertyList_unique_add(&_system_properties, "java.vm.info", 1373 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1374 1375 UseInterpreter = true; 1376 UseCompiler = true; 1377 UseLoopCounter = true; 1378 1379 // Default values may be platform/compiler dependent - 1380 // use the saved values 1381 ClipInlining = Arguments::_ClipInlining; 1382 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1383 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1384 BackgroundCompilation = Arguments::_BackgroundCompilation; 1385 if (TieredCompilation) { 1386 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1387 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1388 } 1389 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1390 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1391 } 1392 } 1393 1394 // Change from defaults based on mode 1395 switch (mode) { 1396 default: 1397 ShouldNotReachHere(); 1398 break; 1399 case _int: 1400 UseCompiler = false; 1401 UseLoopCounter = false; 1402 AlwaysCompileLoopMethods = false; 1403 UseOnStackReplacement = false; 1404 break; 1405 case _mixed: 1406 // same as default 1407 break; 1408 case _comp: 1409 UseInterpreter = false; 1410 BackgroundCompilation = false; 1411 ClipInlining = false; 1412 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1413 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1414 // compile a level 4 (C2) and then continue executing it. 1415 if (TieredCompilation) { 1416 Tier3InvokeNotifyFreqLog = 0; 1417 Tier4InvocationThreshold = 0; 1418 } 1419 break; 1420 } 1421 } 1422 1423 // Conflict: required to use shared spaces (-Xshare:on), but 1424 // incompatible command line options were chosen. 1425 static void no_shared_spaces(const char* message) { 1426 if (RequireSharedSpaces) { 1427 jio_fprintf(defaultStream::error_stream(), 1428 "Class data sharing is inconsistent with other specified options.\n"); 1429 vm_exit_during_initialization("Unable to use shared archive.", message); 1430 } else { 1431 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1432 } 1433 } 1434 1435 // Returns threshold scaled with the value of scale. 1436 // If scale < 0.0, threshold is returned without scaling. 1437 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1438 if (scale == 1.0 || scale < 0.0) { 1439 return threshold; 1440 } else { 1441 return (intx)(threshold * scale); 1442 } 1443 } 1444 1445 // Returns freq_log scaled with the value of scale. 1446 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1447 // If scale < 0.0, freq_log is returned without scaling. 1448 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1449 // Check if scaling is necessary or if negative value was specified. 1450 if (scale == 1.0 || scale < 0.0) { 1451 return freq_log; 1452 } 1453 // Check values to avoid calculating log2 of 0. 1454 if (scale == 0.0 || freq_log == 0) { 1455 return 0; 1456 } 1457 // Determine the maximum notification frequency value currently supported. 1458 // The largest mask value that the interpreter/C1 can handle is 1459 // of length InvocationCounter::number_of_count_bits. Mask values are always 1460 // one bit shorter then the value of the notification frequency. Set 1461 // max_freq_bits accordingly. 1462 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1463 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1464 if (scaled_freq == 0) { 1465 // Return 0 right away to avoid calculating log2 of 0. 1466 return 0; 1467 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1468 return max_freq_bits; 1469 } else { 1470 return log2_intptr(scaled_freq); 1471 } 1472 } 1473 1474 void Arguments::set_tiered_flags() { 1475 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1476 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1477 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1478 } 1479 if (CompilationPolicyChoice < 2) { 1480 vm_exit_during_initialization( 1481 "Incompatible compilation policy selected", NULL); 1482 } 1483 // Increase the code cache size - tiered compiles a lot more. 1484 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1485 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1486 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1487 } 1488 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1489 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1490 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1491 } 1492 if (!UseInterpreter) { // -Xcomp 1493 Tier3InvokeNotifyFreqLog = 0; 1494 Tier4InvocationThreshold = 0; 1495 } 1496 1497 if (CompileThresholdScaling < 0) { 1498 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1499 } 1500 1501 // Scale tiered compilation thresholds. 1502 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1503 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1504 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1505 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1506 1507 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1508 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1509 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1510 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1511 1512 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1513 // once these thresholds become supported. 1514 1515 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1516 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1517 1518 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1519 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1520 1521 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1522 1523 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1524 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1525 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1526 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1527 } 1528 } 1529 1530 #if INCLUDE_ALL_GCS 1531 static void disable_adaptive_size_policy(const char* collector_name) { 1532 if (UseAdaptiveSizePolicy) { 1533 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1534 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1535 collector_name); 1536 } 1537 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1538 } 1539 } 1540 1541 void Arguments::set_parnew_gc_flags() { 1542 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1543 "control point invariant"); 1544 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1545 assert(UseParNewGC, "ParNew should always be used with CMS"); 1546 1547 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1548 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1549 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1550 } else if (ParallelGCThreads == 0) { 1551 jio_fprintf(defaultStream::error_stream(), 1552 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1553 vm_exit(1); 1554 } 1555 1556 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1557 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1558 // we set them to 1024 and 1024. 1559 // See CR 6362902. 1560 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1561 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1562 } 1563 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1564 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1565 } 1566 1567 // When using compressed oops, we use local overflow stacks, 1568 // rather than using a global overflow list chained through 1569 // the klass word of the object's pre-image. 1570 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1571 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1572 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1573 } 1574 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1575 } 1576 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1577 } 1578 1579 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1580 // sparc/solaris for certain applications, but would gain from 1581 // further optimization and tuning efforts, and would almost 1582 // certainly gain from analysis of platform and environment. 1583 void Arguments::set_cms_and_parnew_gc_flags() { 1584 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1585 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1586 assert(UseParNewGC, "ParNew should always be used with CMS"); 1587 1588 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1589 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1590 1591 set_parnew_gc_flags(); 1592 1593 size_t max_heap = align_size_down(MaxHeapSize, 1594 CardTableRS::ct_max_alignment_constraint()); 1595 1596 // Now make adjustments for CMS 1597 intx tenuring_default = (intx)6; 1598 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1599 1600 // Preferred young gen size for "short" pauses: 1601 // upper bound depends on # of threads and NewRatio. 1602 const size_t preferred_max_new_size_unaligned = 1603 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1604 size_t preferred_max_new_size = 1605 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1606 1607 // Unless explicitly requested otherwise, size young gen 1608 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1609 1610 // If either MaxNewSize or NewRatio is set on the command line, 1611 // assume the user is trying to set the size of the young gen. 1612 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1613 1614 // Set MaxNewSize to our calculated preferred_max_new_size unless 1615 // NewSize was set on the command line and it is larger than 1616 // preferred_max_new_size. 1617 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1618 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1619 } else { 1620 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1621 } 1622 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1623 1624 // Code along this path potentially sets NewSize and OldSize 1625 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1626 min_heap_size(), InitialHeapSize, max_heap); 1627 size_t min_new = preferred_max_new_size; 1628 if (FLAG_IS_CMDLINE(NewSize)) { 1629 min_new = NewSize; 1630 } 1631 if (max_heap > min_new && min_heap_size() > min_new) { 1632 // Unless explicitly requested otherwise, make young gen 1633 // at least min_new, and at most preferred_max_new_size. 1634 if (FLAG_IS_DEFAULT(NewSize)) { 1635 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1636 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1637 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1638 } 1639 // Unless explicitly requested otherwise, size old gen 1640 // so it's NewRatio x of NewSize. 1641 if (FLAG_IS_DEFAULT(OldSize)) { 1642 if (max_heap > NewSize) { 1643 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1644 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1645 } 1646 } 1647 } 1648 } 1649 // Unless explicitly requested otherwise, definitely 1650 // promote all objects surviving "tenuring_default" scavenges. 1651 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1652 FLAG_IS_DEFAULT(SurvivorRatio)) { 1653 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1654 } 1655 // If we decided above (or user explicitly requested) 1656 // `promote all' (via MaxTenuringThreshold := 0), 1657 // prefer minuscule survivor spaces so as not to waste 1658 // space for (non-existent) survivors 1659 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1660 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1661 } 1662 1663 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1664 // but rather the number of free blocks of a given size that are used when 1665 // replenishing the local per-worker free list caches. 1666 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1667 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1668 // OldPLAB sizing manually turned off: Use a larger default setting, 1669 // unless it was manually specified. This is because a too-low value 1670 // will slow down scavenges. 1671 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1672 } else { 1673 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1674 } 1675 } 1676 1677 // If either of the static initialization defaults have changed, note this 1678 // modification. 1679 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1680 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1681 } 1682 1683 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1684 } 1685 #endif // INCLUDE_ALL_GCS 1686 1687 void set_object_alignment() { 1688 // Object alignment. 1689 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1690 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1691 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1692 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1693 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1694 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1695 1696 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1697 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1698 1699 // Oop encoding heap max 1700 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1701 1702 if (SurvivorAlignmentInBytes == 0) { 1703 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1704 } 1705 1706 #if INCLUDE_ALL_GCS 1707 // Set CMS global values 1708 CompactibleFreeListSpace::set_cms_values(); 1709 #endif // INCLUDE_ALL_GCS 1710 } 1711 1712 size_t Arguments::max_heap_for_compressed_oops() { 1713 // Avoid sign flip. 1714 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1715 // We need to fit both the NULL page and the heap into the memory budget, while 1716 // keeping alignment constraints of the heap. To guarantee the latter, as the 1717 // NULL page is located before the heap, we pad the NULL page to the conservative 1718 // maximum alignment that the GC may ever impose upon the heap. 1719 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1720 _conservative_max_heap_alignment); 1721 1722 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1723 NOT_LP64(ShouldNotReachHere(); return 0); 1724 } 1725 1726 bool Arguments::should_auto_select_low_pause_collector() { 1727 if (UseAutoGCSelectPolicy && 1728 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1729 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1730 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1731 return true; 1732 } 1733 return false; 1734 } 1735 1736 void Arguments::set_use_compressed_oops() { 1737 #ifndef ZERO 1738 #ifdef _LP64 1739 // MaxHeapSize is not set up properly at this point, but 1740 // the only value that can override MaxHeapSize if we are 1741 // to use UseCompressedOops is InitialHeapSize. 1742 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1743 1744 if (max_heap_size <= max_heap_for_compressed_oops()) { 1745 #if !defined(COMPILER1) || defined(TIERED) 1746 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1747 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1748 } 1749 #endif 1750 } else { 1751 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1752 warning("Max heap size too large for Compressed Oops"); 1753 FLAG_SET_DEFAULT(UseCompressedOops, false); 1754 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1755 } 1756 } 1757 #endif // _LP64 1758 #endif // ZERO 1759 } 1760 1761 1762 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1763 // set_use_compressed_oops(). 1764 void Arguments::set_use_compressed_klass_ptrs() { 1765 #ifndef ZERO 1766 #ifdef _LP64 1767 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1768 if (!UseCompressedOops) { 1769 if (UseCompressedClassPointers) { 1770 warning("UseCompressedClassPointers requires UseCompressedOops"); 1771 } 1772 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1773 } else { 1774 // Turn on UseCompressedClassPointers too 1775 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1776 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1777 } 1778 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1779 if (UseCompressedClassPointers) { 1780 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1781 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1782 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1783 } 1784 } 1785 } 1786 #endif // _LP64 1787 #endif // !ZERO 1788 } 1789 1790 void Arguments::set_conservative_max_heap_alignment() { 1791 // The conservative maximum required alignment for the heap is the maximum of 1792 // the alignments imposed by several sources: any requirements from the heap 1793 // itself, the collector policy and the maximum page size we may run the VM 1794 // with. 1795 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1796 #if INCLUDE_ALL_GCS 1797 if (UseParallelGC) { 1798 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1799 } else if (UseG1GC) { 1800 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1801 } 1802 #endif // INCLUDE_ALL_GCS 1803 _conservative_max_heap_alignment = MAX4(heap_alignment, 1804 (size_t)os::vm_allocation_granularity(), 1805 os::max_page_size(), 1806 CollectorPolicy::compute_heap_alignment()); 1807 } 1808 1809 bool Arguments::gc_selected() { 1810 #if INCLUDE_ALL_GCS 1811 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1812 #else 1813 return UseSerialGC; 1814 #endif // INCLUDE_ALL_GCS 1815 } 1816 1817 void Arguments::select_gc_ergonomically() { 1818 #if INCLUDE_ALL_GCS 1819 if (os::is_server_class_machine()) { 1820 if (!UseAutoGCSelectPolicy) { 1821 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1822 } else { 1823 if (should_auto_select_low_pause_collector()) { 1824 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true); 1825 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true); 1826 } else { 1827 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true); 1828 } 1829 } 1830 } else { 1831 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1832 } 1833 #else 1834 UNSUPPORTED_OPTION(UseG1GC); 1835 UNSUPPORTED_OPTION(UseParallelGC); 1836 UNSUPPORTED_OPTION(UseParallelOldGC); 1837 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1838 UNSUPPORTED_OPTION(UseParNewGC); 1839 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1840 #endif // INCLUDE_ALL_GCS 1841 } 1842 1843 void Arguments::select_gc() { 1844 if (!gc_selected()) { 1845 select_gc_ergonomically(); 1846 if (!gc_selected()) { 1847 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1848 } 1849 } 1850 } 1851 1852 void Arguments::set_ergonomics_flags() { 1853 select_gc(); 1854 1855 #if defined(COMPILER2) || INCLUDE_JVMCI 1856 // Shared spaces work fine with other GCs but causes bytecode rewriting 1857 // to be disabled, which hurts interpreter performance and decreases 1858 // server performance. When -server is specified, keep the default off 1859 // unless it is asked for. Future work: either add bytecode rewriting 1860 // at link time, or rewrite bytecodes in non-shared methods. 1861 if (!DumpSharedSpaces && !RequireSharedSpaces && 1862 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1863 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1864 } 1865 #endif 1866 1867 set_conservative_max_heap_alignment(); 1868 1869 #ifndef ZERO 1870 #ifdef _LP64 1871 set_use_compressed_oops(); 1872 1873 // set_use_compressed_klass_ptrs() must be called after calling 1874 // set_use_compressed_oops(). 1875 set_use_compressed_klass_ptrs(); 1876 1877 // Also checks that certain machines are slower with compressed oops 1878 // in vm_version initialization code. 1879 #endif // _LP64 1880 #endif // !ZERO 1881 1882 CodeCacheExtensions::set_ergonomics_flags(); 1883 } 1884 1885 void Arguments::set_parallel_gc_flags() { 1886 assert(UseParallelGC || UseParallelOldGC, "Error"); 1887 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1888 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1889 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1890 } 1891 FLAG_SET_DEFAULT(UseParallelGC, true); 1892 1893 // If no heap maximum was requested explicitly, use some reasonable fraction 1894 // of the physical memory, up to a maximum of 1GB. 1895 FLAG_SET_DEFAULT(ParallelGCThreads, 1896 Abstract_VM_Version::parallel_worker_threads()); 1897 if (ParallelGCThreads == 0) { 1898 jio_fprintf(defaultStream::error_stream(), 1899 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1900 vm_exit(1); 1901 } 1902 1903 if (UseAdaptiveSizePolicy) { 1904 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1905 // unless the user actually sets these flags. 1906 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1907 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1908 } 1909 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1910 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1911 } 1912 } 1913 1914 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1915 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1916 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1917 // See CR 6362902 for details. 1918 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1919 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1920 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1921 } 1922 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1923 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1924 } 1925 } 1926 1927 if (UseParallelOldGC) { 1928 // Par compact uses lower default values since they are treated as 1929 // minimums. These are different defaults because of the different 1930 // interpretation and are not ergonomically set. 1931 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1932 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1933 } 1934 } 1935 } 1936 1937 void Arguments::set_g1_gc_flags() { 1938 assert(UseG1GC, "Error"); 1939 #if defined(COMPILER1) || INCLUDE_JVMCI 1940 FastTLABRefill = false; 1941 #endif 1942 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1943 if (ParallelGCThreads == 0) { 1944 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1945 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1946 } 1947 1948 #if INCLUDE_ALL_GCS 1949 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1950 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1951 } 1952 #endif 1953 1954 // MarkStackSize will be set (if it hasn't been set by the user) 1955 // when concurrent marking is initialized. 1956 // Its value will be based upon the number of parallel marking threads. 1957 // But we do set the maximum mark stack size here. 1958 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1959 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1960 } 1961 1962 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1963 // In G1, we want the default GC overhead goal to be higher than 1964 // it is for PS, or the heap might be expanded too aggressively. 1965 // We set it here to ~8%. 1966 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1967 } 1968 1969 // Below, we might need to calculate the pause time interval based on 1970 // the pause target. When we do so we are going to give G1 maximum 1971 // flexibility and allow it to do pauses when it needs to. So, we'll 1972 // arrange that the pause interval to be pause time target + 1 to 1973 // ensure that a) the pause time target is maximized with respect to 1974 // the pause interval and b) we maintain the invariant that pause 1975 // time target < pause interval. If the user does not want this 1976 // maximum flexibility, they will have to set the pause interval 1977 // explicitly. 1978 1979 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1980 // The default pause time target in G1 is 200ms 1981 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1982 } 1983 1984 // Then, if the interval parameter was not set, set it according to 1985 // the pause time target (this will also deal with the case when the 1986 // pause time target is the default value). 1987 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1988 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1989 } 1990 1991 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1992 } 1993 1994 void Arguments::set_gc_specific_flags() { 1995 #if INCLUDE_ALL_GCS 1996 // Set per-collector flags 1997 if (UseParallelGC || UseParallelOldGC) { 1998 set_parallel_gc_flags(); 1999 } else if (UseConcMarkSweepGC) { 2000 set_cms_and_parnew_gc_flags(); 2001 } else if (UseG1GC) { 2002 set_g1_gc_flags(); 2003 } 2004 if (AssumeMP && !UseSerialGC) { 2005 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2006 warning("If the number of processors is expected to increase from one, then" 2007 " you should configure the number of parallel GC threads appropriately" 2008 " using -XX:ParallelGCThreads=N"); 2009 } 2010 } 2011 if (MinHeapFreeRatio == 100) { 2012 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2013 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2014 } 2015 2016 // If class unloading is disabled, also disable concurrent class unloading. 2017 if (!ClassUnloading) { 2018 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2019 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2020 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 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 jio_snprintf(buffer, 1024, "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 addmods_count = 0; 2570 unsigned int patch_mod_count = 0; 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 #if INCLUDE_CDS 2656 if (UseSharedSpaces && patch_mod_javabase) { 2657 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 2658 } 2659 #endif 2660 2661 return JNI_OK; 2662 } 2663 2664 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2665 // represents a valid JDWP agent. is_path==true denotes that we 2666 // are dealing with -agentpath (case where name is a path), otherwise with 2667 // -agentlib 2668 bool valid_jdwp_agent(char *name, bool is_path) { 2669 char *_name; 2670 const char *_jdwp = "jdwp"; 2671 size_t _len_jdwp, _len_prefix; 2672 2673 if (is_path) { 2674 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2675 return false; 2676 } 2677 2678 _name++; // skip past last path separator 2679 _len_prefix = strlen(JNI_LIB_PREFIX); 2680 2681 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2682 return false; 2683 } 2684 2685 _name += _len_prefix; 2686 _len_jdwp = strlen(_jdwp); 2687 2688 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2689 _name += _len_jdwp; 2690 } 2691 else { 2692 return false; 2693 } 2694 2695 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2696 return false; 2697 } 2698 2699 return true; 2700 } 2701 2702 if (strcmp(name, _jdwp) == 0) { 2703 return true; 2704 } 2705 2706 return false; 2707 } 2708 2709 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2710 // --patch-module=<module>=<file>(<pathsep><file>)* 2711 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2712 // Find the equal sign between the module name and the path specification 2713 const char* module_equal = strchr(patch_mod_tail, '='); 2714 if (module_equal == NULL) { 2715 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2716 return JNI_ERR; 2717 } else { 2718 // Pick out the module name 2719 size_t module_len = module_equal - patch_mod_tail; 2720 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2721 if (module_name != NULL) { 2722 memcpy(module_name, patch_mod_tail, module_len); 2723 *(module_name + module_len) = '\0'; 2724 // The path piece begins one past the module_equal sign 2725 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2726 FREE_C_HEAP_ARRAY(char, module_name); 2727 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2728 return JNI_ENOMEM; 2729 } 2730 } else { 2731 return JNI_ENOMEM; 2732 } 2733 } 2734 return JNI_OK; 2735 } 2736 2737 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2738 // For match_option to return remaining or value part of option string 2739 const char* tail; 2740 2741 // iterate over arguments 2742 for (int index = 0; index < args->nOptions; index++) { 2743 bool is_absolute_path = false; // for -agentpath vs -agentlib 2744 2745 const JavaVMOption* option = args->options + index; 2746 2747 if (!match_option(option, "-Djava.class.path", &tail) && 2748 !match_option(option, "-Dsun.java.command", &tail) && 2749 !match_option(option, "-Dsun.java.launcher", &tail)) { 2750 2751 // add all jvm options to the jvm_args string. This string 2752 // is used later to set the java.vm.args PerfData string constant. 2753 // the -Djava.class.path and the -Dsun.java.command options are 2754 // omitted from jvm_args string as each have their own PerfData 2755 // string constant object. 2756 build_jvm_args(option->optionString); 2757 } 2758 2759 // -verbose:[class/gc/jni] 2760 if (match_option(option, "-verbose", &tail)) { 2761 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2762 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2763 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2764 } else if (!strcmp(tail, ":gc")) { 2765 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2766 } else if (!strcmp(tail, ":jni")) { 2767 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2768 return JNI_EINVAL; 2769 } 2770 } 2771 // -da / -ea / -disableassertions / -enableassertions 2772 // These accept an optional class/package name separated by a colon, e.g., 2773 // -da:java.lang.Thread. 2774 } else if (match_option(option, user_assertion_options, &tail, true)) { 2775 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2776 if (*tail == '\0') { 2777 JavaAssertions::setUserClassDefault(enable); 2778 } else { 2779 assert(*tail == ':', "bogus match by match_option()"); 2780 JavaAssertions::addOption(tail + 1, enable); 2781 } 2782 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2783 } else if (match_option(option, system_assertion_options, &tail, false)) { 2784 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2785 JavaAssertions::setSystemClassDefault(enable); 2786 // -bootclasspath: 2787 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2788 jio_fprintf(defaultStream::output_stream(), 2789 "-Xbootclasspath is no longer a supported option.\n"); 2790 return JNI_EINVAL; 2791 // -bootclasspath/a: 2792 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2793 Arguments::append_sysclasspath(tail); 2794 // -bootclasspath/p: 2795 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2796 jio_fprintf(defaultStream::output_stream(), 2797 "-Xbootclasspath/p is no longer a supported option.\n"); 2798 return JNI_EINVAL; 2799 // -Xrun 2800 } else if (match_option(option, "-Xrun", &tail)) { 2801 if (tail != NULL) { 2802 const char* pos = strchr(tail, ':'); 2803 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2804 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2805 jio_snprintf(name, len + 1, "%s", tail); 2806 2807 char *options = NULL; 2808 if(pos != NULL) { 2809 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2810 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2811 } 2812 #if !INCLUDE_JVMTI 2813 if (strcmp(name, "jdwp") == 0) { 2814 jio_fprintf(defaultStream::error_stream(), 2815 "Debugging agents are not supported in this VM\n"); 2816 return JNI_ERR; 2817 } 2818 #endif // !INCLUDE_JVMTI 2819 add_init_library(name, options); 2820 } 2821 } else if (match_option(option, "--add-reads=", &tail)) { 2822 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2823 return JNI_ENOMEM; 2824 } 2825 } else if (match_option(option, "--add-exports=", &tail)) { 2826 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2827 return JNI_ENOMEM; 2828 } 2829 } else if (match_option(option, "--add-modules=", &tail)) { 2830 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2831 return JNI_ENOMEM; 2832 } 2833 } else if (match_option(option, "--limit-modules=", &tail)) { 2834 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2835 return JNI_ENOMEM; 2836 } 2837 } else if (match_option(option, "--module-path=", &tail)) { 2838 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2839 return JNI_ENOMEM; 2840 } 2841 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2842 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2843 return JNI_ENOMEM; 2844 } 2845 } else if (match_option(option, "--patch-module=", &tail)) { 2846 // --patch-module=<module>=<file>(<pathsep><file>)* 2847 int res = process_patch_mod_option(tail, patch_mod_javabase); 2848 if (res != JNI_OK) { 2849 return res; 2850 } 2851 // -agentlib and -agentpath 2852 } else if (match_option(option, "-agentlib:", &tail) || 2853 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2854 if(tail != NULL) { 2855 const char* pos = strchr(tail, '='); 2856 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2857 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2858 name[len] = '\0'; 2859 2860 char *options = NULL; 2861 if(pos != NULL) { 2862 options = os::strdup_check_oom(pos + 1, mtArguments); 2863 } 2864 #if !INCLUDE_JVMTI 2865 if (valid_jdwp_agent(name, is_absolute_path)) { 2866 jio_fprintf(defaultStream::error_stream(), 2867 "Debugging agents are not supported in this VM\n"); 2868 return JNI_ERR; 2869 } 2870 #endif // !INCLUDE_JVMTI 2871 add_init_agent(name, options, is_absolute_path); 2872 } 2873 // -javaagent 2874 } else if (match_option(option, "-javaagent:", &tail)) { 2875 #if !INCLUDE_JVMTI 2876 jio_fprintf(defaultStream::error_stream(), 2877 "Instrumentation agents are not supported in this VM\n"); 2878 return JNI_ERR; 2879 #else 2880 if (tail != NULL) { 2881 size_t length = strlen(tail) + 1; 2882 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2883 jio_snprintf(options, length, "%s", tail); 2884 add_init_agent("instrument", options, false); 2885 // java agents need module java.instrument 2886 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2887 return JNI_ENOMEM; 2888 } 2889 } 2890 #endif // !INCLUDE_JVMTI 2891 // -Xnoclassgc 2892 } else if (match_option(option, "-Xnoclassgc")) { 2893 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2894 return JNI_EINVAL; 2895 } 2896 // -Xconcgc 2897 } else if (match_option(option, "-Xconcgc")) { 2898 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2899 return JNI_EINVAL; 2900 } 2901 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2902 // -Xnoconcgc 2903 } else if (match_option(option, "-Xnoconcgc")) { 2904 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2905 return JNI_EINVAL; 2906 } 2907 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2908 // -Xbatch 2909 } else if (match_option(option, "-Xbatch")) { 2910 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2911 return JNI_EINVAL; 2912 } 2913 // -Xmn for compatibility with other JVM vendors 2914 } else if (match_option(option, "-Xmn", &tail)) { 2915 julong long_initial_young_size = 0; 2916 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2917 if (errcode != arg_in_range) { 2918 jio_fprintf(defaultStream::error_stream(), 2919 "Invalid initial young generation size: %s\n", option->optionString); 2920 describe_range_error(errcode); 2921 return JNI_EINVAL; 2922 } 2923 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2924 return JNI_EINVAL; 2925 } 2926 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2927 return JNI_EINVAL; 2928 } 2929 // -Xms 2930 } else if (match_option(option, "-Xms", &tail)) { 2931 julong long_initial_heap_size = 0; 2932 // an initial heap size of 0 means automatically determine 2933 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2934 if (errcode != arg_in_range) { 2935 jio_fprintf(defaultStream::error_stream(), 2936 "Invalid initial heap size: %s\n", option->optionString); 2937 describe_range_error(errcode); 2938 return JNI_EINVAL; 2939 } 2940 set_min_heap_size((size_t)long_initial_heap_size); 2941 // Currently the minimum size and the initial heap sizes are the same. 2942 // Can be overridden with -XX:InitialHeapSize. 2943 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2944 return JNI_EINVAL; 2945 } 2946 // -Xmx 2947 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2948 julong long_max_heap_size = 0; 2949 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2950 if (errcode != arg_in_range) { 2951 jio_fprintf(defaultStream::error_stream(), 2952 "Invalid maximum heap size: %s\n", option->optionString); 2953 describe_range_error(errcode); 2954 return JNI_EINVAL; 2955 } 2956 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2957 return JNI_EINVAL; 2958 } 2959 // Xmaxf 2960 } else if (match_option(option, "-Xmaxf", &tail)) { 2961 char* err; 2962 int maxf = (int)(strtod(tail, &err) * 100); 2963 if (*err != '\0' || *tail == '\0') { 2964 jio_fprintf(defaultStream::error_stream(), 2965 "Bad max heap free percentage size: %s\n", 2966 option->optionString); 2967 return JNI_EINVAL; 2968 } else { 2969 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2970 return JNI_EINVAL; 2971 } 2972 } 2973 // Xminf 2974 } else if (match_option(option, "-Xminf", &tail)) { 2975 char* err; 2976 int minf = (int)(strtod(tail, &err) * 100); 2977 if (*err != '\0' || *tail == '\0') { 2978 jio_fprintf(defaultStream::error_stream(), 2979 "Bad min heap free percentage size: %s\n", 2980 option->optionString); 2981 return JNI_EINVAL; 2982 } else { 2983 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2984 return JNI_EINVAL; 2985 } 2986 } 2987 // -Xss 2988 } else if (match_option(option, "-Xss", &tail)) { 2989 julong long_ThreadStackSize = 0; 2990 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2991 if (errcode != arg_in_range) { 2992 jio_fprintf(defaultStream::error_stream(), 2993 "Invalid thread stack size: %s\n", option->optionString); 2994 describe_range_error(errcode); 2995 return JNI_EINVAL; 2996 } 2997 // Internally track ThreadStackSize in units of 1024 bytes. 2998 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2999 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 3000 return JNI_EINVAL; 3001 } 3002 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 3003 } else if (match_option(option, "-Xoss", &tail) || 3004 match_option(option, "-Xsqnopause") || 3005 match_option(option, "-Xoptimize") || 3006 match_option(option, "-Xboundthreads") || 3007 match_option(option, "-Xusealtsigs")) { 3008 // All these options are deprecated in JDK 9 and will be removed in a future release 3009 char version[256]; 3010 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3011 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3012 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3013 julong long_CodeCacheExpansionSize = 0; 3014 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3015 if (errcode != arg_in_range) { 3016 jio_fprintf(defaultStream::error_stream(), 3017 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3018 os::vm_page_size()/K); 3019 return JNI_EINVAL; 3020 } 3021 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3022 return JNI_EINVAL; 3023 } 3024 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3025 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3026 julong long_ReservedCodeCacheSize = 0; 3027 3028 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3029 if (errcode != arg_in_range) { 3030 jio_fprintf(defaultStream::error_stream(), 3031 "Invalid maximum code cache size: %s.\n", option->optionString); 3032 return JNI_EINVAL; 3033 } 3034 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3035 return JNI_EINVAL; 3036 } 3037 // -XX:NonNMethodCodeHeapSize= 3038 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3039 julong long_NonNMethodCodeHeapSize = 0; 3040 3041 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3042 if (errcode != arg_in_range) { 3043 jio_fprintf(defaultStream::error_stream(), 3044 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3045 return JNI_EINVAL; 3046 } 3047 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3048 return JNI_EINVAL; 3049 } 3050 // -XX:ProfiledCodeHeapSize= 3051 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3052 julong long_ProfiledCodeHeapSize = 0; 3053 3054 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3055 if (errcode != arg_in_range) { 3056 jio_fprintf(defaultStream::error_stream(), 3057 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3058 return JNI_EINVAL; 3059 } 3060 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3061 return JNI_EINVAL; 3062 } 3063 // -XX:NonProfiledCodeHeapSizee= 3064 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3065 julong long_NonProfiledCodeHeapSize = 0; 3066 3067 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3068 if (errcode != arg_in_range) { 3069 jio_fprintf(defaultStream::error_stream(), 3070 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3071 return JNI_EINVAL; 3072 } 3073 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3074 return JNI_EINVAL; 3075 } 3076 // -green 3077 } else if (match_option(option, "-green")) { 3078 jio_fprintf(defaultStream::error_stream(), 3079 "Green threads support not available\n"); 3080 return JNI_EINVAL; 3081 // -native 3082 } else if (match_option(option, "-native")) { 3083 // HotSpot always uses native threads, ignore silently for compatibility 3084 // -Xrs 3085 } else if (match_option(option, "-Xrs")) { 3086 // Classic/EVM option, new functionality 3087 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3088 return JNI_EINVAL; 3089 } 3090 // -Xprof 3091 } else if (match_option(option, "-Xprof")) { 3092 #if INCLUDE_FPROF 3093 _has_profile = true; 3094 #else // INCLUDE_FPROF 3095 jio_fprintf(defaultStream::error_stream(), 3096 "Flat profiling is not supported in this VM.\n"); 3097 return JNI_ERR; 3098 #endif // INCLUDE_FPROF 3099 // -Xconcurrentio 3100 } else if (match_option(option, "-Xconcurrentio")) { 3101 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3102 return JNI_EINVAL; 3103 } 3104 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3105 return JNI_EINVAL; 3106 } 3107 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3108 return JNI_EINVAL; 3109 } 3110 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3111 return JNI_EINVAL; 3112 } 3113 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3114 return JNI_EINVAL; 3115 } 3116 3117 // -Xinternalversion 3118 } else if (match_option(option, "-Xinternalversion")) { 3119 jio_fprintf(defaultStream::output_stream(), "%s\n", 3120 VM_Version::internal_vm_info_string()); 3121 vm_exit(0); 3122 #ifndef PRODUCT 3123 // -Xprintflags 3124 } else if (match_option(option, "-Xprintflags")) { 3125 CommandLineFlags::printFlags(tty, false); 3126 vm_exit(0); 3127 #endif 3128 // -D 3129 } else if (match_option(option, "-D", &tail)) { 3130 const char* value; 3131 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3132 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3133 // abort if -Djava.endorsed.dirs is set 3134 jio_fprintf(defaultStream::output_stream(), 3135 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3136 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3137 return JNI_EINVAL; 3138 } 3139 if (match_option(option, "-Djava.ext.dirs=", &value) && 3140 *value != '\0' && strcmp(value, "\"\"") != 0) { 3141 // abort if -Djava.ext.dirs is set 3142 jio_fprintf(defaultStream::output_stream(), 3143 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3144 return JNI_EINVAL; 3145 } 3146 // Check for module related properties. They must be set using the modules 3147 // options. For example: use "--add-modules=java.sql", not 3148 // "-Djdk.module.addmods=java.sql" 3149 if (is_internal_module_property(option->optionString + 2)) { 3150 needs_module_property_warning = true; 3151 continue; 3152 } 3153 3154 if (!add_property(tail)) { 3155 return JNI_ENOMEM; 3156 } 3157 // Out of the box management support 3158 if (match_option(option, "-Dcom.sun.management", &tail)) { 3159 #if INCLUDE_MANAGEMENT 3160 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3161 return JNI_EINVAL; 3162 } 3163 // management agent in module java.management 3164 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) { 3165 return JNI_ENOMEM; 3166 } 3167 #else 3168 jio_fprintf(defaultStream::output_stream(), 3169 "-Dcom.sun.management is not supported in this VM.\n"); 3170 return JNI_ERR; 3171 #endif 3172 } 3173 // -Xint 3174 } else if (match_option(option, "-Xint")) { 3175 set_mode_flags(_int); 3176 // -Xmixed 3177 } else if (match_option(option, "-Xmixed")) { 3178 set_mode_flags(_mixed); 3179 // -Xcomp 3180 } else if (match_option(option, "-Xcomp")) { 3181 // for testing the compiler; turn off all flags that inhibit compilation 3182 set_mode_flags(_comp); 3183 // -Xshare:dump 3184 } else if (match_option(option, "-Xshare:dump")) { 3185 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3186 return JNI_EINVAL; 3187 } 3188 set_mode_flags(_int); // Prevent compilation, which creates objects 3189 // -Xshare:on 3190 } else if (match_option(option, "-Xshare:on")) { 3191 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3192 return JNI_EINVAL; 3193 } 3194 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3195 return JNI_EINVAL; 3196 } 3197 // -Xshare:auto 3198 } else if (match_option(option, "-Xshare:auto")) { 3199 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3200 return JNI_EINVAL; 3201 } 3202 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3203 return JNI_EINVAL; 3204 } 3205 // -Xshare:off 3206 } else if (match_option(option, "-Xshare:off")) { 3207 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3208 return JNI_EINVAL; 3209 } 3210 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3211 return JNI_EINVAL; 3212 } 3213 // -Xverify 3214 } else if (match_option(option, "-Xverify", &tail)) { 3215 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3216 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3217 return JNI_EINVAL; 3218 } 3219 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3220 return JNI_EINVAL; 3221 } 3222 } else if (strcmp(tail, ":remote") == 0) { 3223 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3224 return JNI_EINVAL; 3225 } 3226 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3227 return JNI_EINVAL; 3228 } 3229 } else if (strcmp(tail, ":none") == 0) { 3230 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3231 return JNI_EINVAL; 3232 } 3233 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3234 return JNI_EINVAL; 3235 } 3236 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3237 return JNI_EINVAL; 3238 } 3239 // -Xdebug 3240 } else if (match_option(option, "-Xdebug")) { 3241 // note this flag has been used, then ignore 3242 set_xdebug_mode(true); 3243 // -Xnoagent 3244 } else if (match_option(option, "-Xnoagent")) { 3245 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3246 } else if (match_option(option, "-Xloggc:", &tail)) { 3247 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3248 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3249 _gc_log_filename = os::strdup_check_oom(tail); 3250 } else if (match_option(option, "-Xlog", &tail)) { 3251 bool ret = false; 3252 if (strcmp(tail, ":help") == 0) { 3253 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3254 vm_exit(0); 3255 } else if (strcmp(tail, ":disable") == 0) { 3256 LogConfiguration::disable_logging(); 3257 ret = true; 3258 } else if (*tail == '\0') { 3259 ret = LogConfiguration::parse_command_line_arguments(); 3260 assert(ret, "-Xlog without arguments should never fail to parse"); 3261 } else if (*tail == ':') { 3262 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3263 } 3264 if (ret == false) { 3265 jio_fprintf(defaultStream::error_stream(), 3266 "Invalid -Xlog option '-Xlog%s'\n", 3267 tail); 3268 return JNI_EINVAL; 3269 } 3270 // JNI hooks 3271 } else if (match_option(option, "-Xcheck", &tail)) { 3272 if (!strcmp(tail, ":jni")) { 3273 #if !INCLUDE_JNI_CHECK 3274 warning("JNI CHECKING is not supported in this VM"); 3275 #else 3276 CheckJNICalls = true; 3277 #endif // INCLUDE_JNI_CHECK 3278 } else if (is_bad_option(option, args->ignoreUnrecognized, 3279 "check")) { 3280 return JNI_EINVAL; 3281 } 3282 } else if (match_option(option, "vfprintf")) { 3283 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3284 } else if (match_option(option, "exit")) { 3285 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3286 } else if (match_option(option, "abort")) { 3287 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3288 // -XX:+AggressiveHeap 3289 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3290 jint result = set_aggressive_heap_flags(); 3291 if (result != JNI_OK) { 3292 return result; 3293 } 3294 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3295 // and the last option wins. 3296 } else if (match_option(option, "-XX:+NeverTenure")) { 3297 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3298 return JNI_EINVAL; 3299 } 3300 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3301 return JNI_EINVAL; 3302 } 3303 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3304 return JNI_EINVAL; 3305 } 3306 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3307 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3308 return JNI_EINVAL; 3309 } 3310 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3311 return JNI_EINVAL; 3312 } 3313 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3314 return JNI_EINVAL; 3315 } 3316 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3317 uintx max_tenuring_thresh = 0; 3318 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3319 jio_fprintf(defaultStream::error_stream(), 3320 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3321 return JNI_EINVAL; 3322 } 3323 3324 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3325 return JNI_EINVAL; 3326 } 3327 3328 if (MaxTenuringThreshold == 0) { 3329 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3330 return JNI_EINVAL; 3331 } 3332 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3333 return JNI_EINVAL; 3334 } 3335 } else { 3336 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3337 return JNI_EINVAL; 3338 } 3339 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3340 return JNI_EINVAL; 3341 } 3342 } 3343 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3344 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3345 return JNI_EINVAL; 3346 } 3347 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3348 return JNI_EINVAL; 3349 } 3350 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3351 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3352 return JNI_EINVAL; 3353 } 3354 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3355 return JNI_EINVAL; 3356 } 3357 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3358 #if defined(DTRACE_ENABLED) 3359 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3360 return JNI_EINVAL; 3361 } 3362 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3363 return JNI_EINVAL; 3364 } 3365 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3366 return JNI_EINVAL; 3367 } 3368 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3369 return JNI_EINVAL; 3370 } 3371 #else // defined(DTRACE_ENABLED) 3372 jio_fprintf(defaultStream::error_stream(), 3373 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3374 return JNI_EINVAL; 3375 #endif // defined(DTRACE_ENABLED) 3376 #ifdef ASSERT 3377 } else if (match_option(option, "-XX:+FullGCALot")) { 3378 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3379 return JNI_EINVAL; 3380 } 3381 // disable scavenge before parallel mark-compact 3382 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3383 return JNI_EINVAL; 3384 } 3385 #endif 3386 #if !INCLUDE_MANAGEMENT 3387 } else if (match_option(option, "-XX:+ManagementServer")) { 3388 jio_fprintf(defaultStream::error_stream(), 3389 "ManagementServer is not supported in this VM.\n"); 3390 return JNI_ERR; 3391 #endif // INCLUDE_MANAGEMENT 3392 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3393 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3394 // already been handled 3395 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3396 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3397 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3398 return JNI_EINVAL; 3399 } 3400 } 3401 // Unknown option 3402 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3403 return JNI_ERR; 3404 } 3405 } 3406 3407 // PrintSharedArchiveAndExit will turn on 3408 // -Xshare:on 3409 // -Xlog:class+path=info 3410 if (PrintSharedArchiveAndExit) { 3411 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3412 return JNI_EINVAL; 3413 } 3414 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3415 return JNI_EINVAL; 3416 } 3417 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3418 } 3419 3420 // Change the default value for flags which have different default values 3421 // when working with older JDKs. 3422 #ifdef LINUX 3423 if (JDK_Version::current().compare_major(6) <= 0 && 3424 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3425 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3426 } 3427 #endif // LINUX 3428 fix_appclasspath(); 3429 return JNI_OK; 3430 } 3431 3432 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3433 // For java.base check for duplicate --patch-module options being specified on the command line. 3434 // This check is only required for java.base, all other duplicate module specifications 3435 // will be checked during module system initialization. The module system initialization 3436 // will throw an ExceptionInInitializerError if this situation occurs. 3437 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3438 if (*patch_mod_javabase) { 3439 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3440 } else { 3441 *patch_mod_javabase = true; 3442 } 3443 } 3444 3445 // Create GrowableArray lazily, only if --patch-module has been specified 3446 if (_patch_mod_prefix == NULL) { 3447 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3448 } 3449 3450 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3451 } 3452 3453 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3454 // 3455 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3456 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3457 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3458 // path is treated as the current directory. 3459 // 3460 // This causes problems with CDS, which requires that all directories specified in the classpath 3461 // must be empty. In most cases, applications do NOT want to load classes from the current 3462 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3463 // scripts compatible with CDS. 3464 void Arguments::fix_appclasspath() { 3465 if (IgnoreEmptyClassPaths) { 3466 const char separator = *os::path_separator(); 3467 const char* src = _java_class_path->value(); 3468 3469 // skip over all the leading empty paths 3470 while (*src == separator) { 3471 src ++; 3472 } 3473 3474 char* copy = os::strdup_check_oom(src, mtArguments); 3475 3476 // trim all trailing empty paths 3477 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3478 *tail = '\0'; 3479 } 3480 3481 char from[3] = {separator, separator, '\0'}; 3482 char to [2] = {separator, '\0'}; 3483 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3484 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3485 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3486 } 3487 3488 _java_class_path->set_writeable_value(copy); 3489 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3490 } 3491 } 3492 3493 static bool has_jar_files(const char* directory) { 3494 DIR* dir = os::opendir(directory); 3495 if (dir == NULL) return false; 3496 3497 struct dirent *entry; 3498 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3499 bool hasJarFile = false; 3500 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3501 const char* name = entry->d_name; 3502 const char* ext = name + strlen(name) - 4; 3503 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3504 } 3505 FREE_C_HEAP_ARRAY(char, dbuf); 3506 os::closedir(dir); 3507 return hasJarFile ; 3508 } 3509 3510 static int check_non_empty_dirs(const char* path) { 3511 const char separator = *os::path_separator(); 3512 const char* const end = path + strlen(path); 3513 int nonEmptyDirs = 0; 3514 while (path < end) { 3515 const char* tmp_end = strchr(path, separator); 3516 if (tmp_end == NULL) { 3517 if (has_jar_files(path)) { 3518 nonEmptyDirs++; 3519 jio_fprintf(defaultStream::output_stream(), 3520 "Non-empty directory: %s\n", path); 3521 } 3522 path = end; 3523 } else { 3524 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3525 memcpy(dirpath, path, tmp_end - path); 3526 dirpath[tmp_end - path] = '\0'; 3527 if (has_jar_files(dirpath)) { 3528 nonEmptyDirs++; 3529 jio_fprintf(defaultStream::output_stream(), 3530 "Non-empty directory: %s\n", dirpath); 3531 } 3532 FREE_C_HEAP_ARRAY(char, dirpath); 3533 path = tmp_end + 1; 3534 } 3535 } 3536 return nonEmptyDirs; 3537 } 3538 3539 jint Arguments::finalize_vm_init_args() { 3540 // check if the default lib/endorsed directory exists; if so, error 3541 char path[JVM_MAXPATHLEN]; 3542 const char* fileSep = os::file_separator(); 3543 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3544 3545 if (CheckEndorsedAndExtDirs) { 3546 int nonEmptyDirs = 0; 3547 // check endorsed directory 3548 nonEmptyDirs += check_non_empty_dirs(path); 3549 // check the extension directories 3550 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3551 if (nonEmptyDirs > 0) { 3552 return JNI_ERR; 3553 } 3554 } 3555 3556 DIR* dir = os::opendir(path); 3557 if (dir != NULL) { 3558 jio_fprintf(defaultStream::output_stream(), 3559 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3560 "in modular form will be supported via the concept of upgradeable modules.\n"); 3561 os::closedir(dir); 3562 return JNI_ERR; 3563 } 3564 3565 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3566 dir = os::opendir(path); 3567 if (dir != NULL) { 3568 jio_fprintf(defaultStream::output_stream(), 3569 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3570 "Use -classpath instead.\n."); 3571 os::closedir(dir); 3572 return JNI_ERR; 3573 } 3574 3575 // This must be done after all arguments have been processed. 3576 // java_compiler() true means set to "NONE" or empty. 3577 if (java_compiler() && !xdebug_mode()) { 3578 // For backwards compatibility, we switch to interpreted mode if 3579 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3580 // not specified. 3581 set_mode_flags(_int); 3582 } 3583 3584 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3585 // but like -Xint, leave compilation thresholds unaffected. 3586 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3587 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3588 set_mode_flags(_int); 3589 } 3590 3591 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3592 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3593 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3594 } 3595 3596 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3597 // Don't degrade server performance for footprint 3598 if (FLAG_IS_DEFAULT(UseLargePages) && 3599 MaxHeapSize < LargePageHeapSizeThreshold) { 3600 // No need for large granularity pages w/small heaps. 3601 // Note that large pages are enabled/disabled for both the 3602 // Java heap and the code cache. 3603 FLAG_SET_DEFAULT(UseLargePages, false); 3604 } 3605 3606 #elif defined(COMPILER2) 3607 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3608 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3609 } 3610 #endif 3611 3612 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3613 UNSUPPORTED_OPTION(ProfileInterpreter); 3614 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3615 #endif 3616 3617 #ifndef TIERED 3618 // Tiered compilation is undefined. 3619 UNSUPPORTED_OPTION(TieredCompilation); 3620 #endif 3621 3622 #if INCLUDE_JVMCI 3623 if (EnableJVMCI && 3624 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) { 3625 return JNI_ENOMEM; 3626 } 3627 #endif 3628 3629 // If we are running in a headless jre, force java.awt.headless property 3630 // to be true unless the property has already been set. 3631 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3632 if (os::is_headless_jre()) { 3633 const char* headless = Arguments::get_property("java.awt.headless"); 3634 if (headless == NULL) { 3635 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3636 if (headless_env == NULL) { 3637 if (!add_property("java.awt.headless=true")) { 3638 return JNI_ENOMEM; 3639 } 3640 } else { 3641 char buffer[256]; 3642 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3643 if (!add_property(buffer)) { 3644 return JNI_ENOMEM; 3645 } 3646 } 3647 } 3648 } 3649 3650 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3651 // CMS can only be used with ParNew 3652 FLAG_SET_ERGO(bool, UseParNewGC, true); 3653 } 3654 3655 if (!check_vm_args_consistency()) { 3656 return JNI_ERR; 3657 } 3658 3659 return JNI_OK; 3660 } 3661 3662 // Helper class for controlling the lifetime of JavaVMInitArgs 3663 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3664 // deleted on the destruction of the ScopedVMInitArgs object. 3665 class ScopedVMInitArgs : public StackObj { 3666 private: 3667 JavaVMInitArgs _args; 3668 char* _container_name; 3669 bool _is_set; 3670 char* _vm_options_file_arg; 3671 3672 public: 3673 ScopedVMInitArgs(const char *container_name) { 3674 _args.version = JNI_VERSION_1_2; 3675 _args.nOptions = 0; 3676 _args.options = NULL; 3677 _args.ignoreUnrecognized = false; 3678 _container_name = (char *)container_name; 3679 _is_set = false; 3680 _vm_options_file_arg = NULL; 3681 } 3682 3683 // Populates the JavaVMInitArgs object represented by this 3684 // ScopedVMInitArgs object with the arguments in options. The 3685 // allocated memory is deleted by the destructor. If this method 3686 // returns anything other than JNI_OK, then this object is in a 3687 // partially constructed state, and should be abandoned. 3688 jint set_args(GrowableArray<JavaVMOption>* options) { 3689 _is_set = true; 3690 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3691 JavaVMOption, options->length(), mtArguments); 3692 if (options_arr == NULL) { 3693 return JNI_ENOMEM; 3694 } 3695 _args.options = options_arr; 3696 3697 for (int i = 0; i < options->length(); i++) { 3698 options_arr[i] = options->at(i); 3699 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3700 if (options_arr[i].optionString == NULL) { 3701 // Rely on the destructor to do cleanup. 3702 _args.nOptions = i; 3703 return JNI_ENOMEM; 3704 } 3705 } 3706 3707 _args.nOptions = options->length(); 3708 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3709 return JNI_OK; 3710 } 3711 3712 JavaVMInitArgs* get() { return &_args; } 3713 char* container_name() { return _container_name; } 3714 bool is_set() { return _is_set; } 3715 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3716 char* vm_options_file_arg() { return _vm_options_file_arg; } 3717 3718 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3719 if (_vm_options_file_arg != NULL) { 3720 os::free(_vm_options_file_arg); 3721 } 3722 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3723 } 3724 3725 ~ScopedVMInitArgs() { 3726 if (_vm_options_file_arg != NULL) { 3727 os::free(_vm_options_file_arg); 3728 } 3729 if (_args.options == NULL) return; 3730 for (int i = 0; i < _args.nOptions; i++) { 3731 os::free(_args.options[i].optionString); 3732 } 3733 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3734 } 3735 3736 // Insert options into this option list, to replace option at 3737 // vm_options_file_pos (-XX:VMOptionsFile) 3738 jint insert(const JavaVMInitArgs* args, 3739 const JavaVMInitArgs* args_to_insert, 3740 const int vm_options_file_pos) { 3741 assert(_args.options == NULL, "shouldn't be set yet"); 3742 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3743 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3744 3745 int length = args->nOptions + args_to_insert->nOptions - 1; 3746 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3747 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3748 for (int i = 0; i < args->nOptions; i++) { 3749 if (i == vm_options_file_pos) { 3750 // insert the new options starting at the same place as the 3751 // -XX:VMOptionsFile option 3752 for (int j = 0; j < args_to_insert->nOptions; j++) { 3753 options->push(args_to_insert->options[j]); 3754 } 3755 } else { 3756 options->push(args->options[i]); 3757 } 3758 } 3759 // make into options array 3760 jint result = set_args(options); 3761 delete options; 3762 return result; 3763 } 3764 }; 3765 3766 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3767 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3768 } 3769 3770 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3771 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3772 } 3773 3774 jint Arguments::parse_options_environment_variable(const char* name, 3775 ScopedVMInitArgs* vm_args) { 3776 char *buffer = ::getenv(name); 3777 3778 // Don't check this environment variable if user has special privileges 3779 // (e.g. unix su command). 3780 if (buffer == NULL || os::have_special_privileges()) { 3781 return JNI_OK; 3782 } 3783 3784 if ((buffer = os::strdup(buffer)) == NULL) { 3785 return JNI_ENOMEM; 3786 } 3787 3788 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3789 3790 os::free(buffer); 3791 return retcode; 3792 } 3793 3794 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3795 // read file into buffer 3796 int fd = ::open(file_name, O_RDONLY); 3797 if (fd < 0) { 3798 jio_fprintf(defaultStream::error_stream(), 3799 "Could not open options file '%s'\n", 3800 file_name); 3801 return JNI_ERR; 3802 } 3803 3804 struct stat stbuf; 3805 int retcode = os::stat(file_name, &stbuf); 3806 if (retcode != 0) { 3807 jio_fprintf(defaultStream::error_stream(), 3808 "Could not stat options file '%s'\n", 3809 file_name); 3810 os::close(fd); 3811 return JNI_ERR; 3812 } 3813 3814 if (stbuf.st_size == 0) { 3815 // tell caller there is no option data and that is ok 3816 os::close(fd); 3817 return JNI_OK; 3818 } 3819 3820 // '+ 1' for NULL termination even with max bytes 3821 size_t bytes_alloc = stbuf.st_size + 1; 3822 3823 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3824 if (NULL == buf) { 3825 jio_fprintf(defaultStream::error_stream(), 3826 "Could not allocate read buffer for options file parse\n"); 3827 os::close(fd); 3828 return JNI_ENOMEM; 3829 } 3830 3831 memset(buf, 0, bytes_alloc); 3832 3833 // Fill buffer 3834 // Use ::read() instead of os::read because os::read() 3835 // might do a thread state transition 3836 // and it is too early for that here 3837 3838 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3839 os::close(fd); 3840 if (bytes_read < 0) { 3841 FREE_C_HEAP_ARRAY(char, buf); 3842 jio_fprintf(defaultStream::error_stream(), 3843 "Could not read options file '%s'\n", file_name); 3844 return JNI_ERR; 3845 } 3846 3847 if (bytes_read == 0) { 3848 // tell caller there is no option data and that is ok 3849 FREE_C_HEAP_ARRAY(char, buf); 3850 return JNI_OK; 3851 } 3852 3853 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3854 3855 FREE_C_HEAP_ARRAY(char, buf); 3856 return retcode; 3857 } 3858 3859 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3860 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3861 3862 // some pointers to help with parsing 3863 char *buffer_end = buffer + buf_len; 3864 char *opt_hd = buffer; 3865 char *wrt = buffer; 3866 char *rd = buffer; 3867 3868 // parse all options 3869 while (rd < buffer_end) { 3870 // skip leading white space from the input string 3871 while (rd < buffer_end && isspace(*rd)) { 3872 rd++; 3873 } 3874 3875 if (rd >= buffer_end) { 3876 break; 3877 } 3878 3879 // Remember this is where we found the head of the token. 3880 opt_hd = wrt; 3881 3882 // Tokens are strings of non white space characters separated 3883 // by one or more white spaces. 3884 while (rd < buffer_end && !isspace(*rd)) { 3885 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3886 int quote = *rd; // matching quote to look for 3887 rd++; // don't copy open quote 3888 while (rd < buffer_end && *rd != quote) { 3889 // include everything (even spaces) 3890 // up until the close quote 3891 *wrt++ = *rd++; // copy to option string 3892 } 3893 3894 if (rd < buffer_end) { 3895 rd++; // don't copy close quote 3896 } else { 3897 // did not see closing quote 3898 jio_fprintf(defaultStream::error_stream(), 3899 "Unmatched quote in %s\n", name); 3900 delete options; 3901 return JNI_ERR; 3902 } 3903 } else { 3904 *wrt++ = *rd++; // copy to option string 3905 } 3906 } 3907 3908 // steal a white space character and set it to NULL 3909 *wrt++ = '\0'; 3910 // We now have a complete token 3911 3912 JavaVMOption option; 3913 option.optionString = opt_hd; 3914 option.extraInfo = NULL; 3915 3916 options->append(option); // Fill in option 3917 3918 rd++; // Advance to next character 3919 } 3920 3921 // Fill out JavaVMInitArgs structure. 3922 jint status = vm_args->set_args(options); 3923 3924 delete options; 3925 return status; 3926 } 3927 3928 void Arguments::set_shared_spaces_flags() { 3929 if (DumpSharedSpaces) { 3930 if (FailOverToOldVerifier) { 3931 // Don't fall back to the old verifier on verification failure. If a 3932 // class fails verification with the split verifier, it might fail the 3933 // CDS runtime verifier constraint check. In that case, we don't want 3934 // to share the class. We only archive classes that pass the split verifier. 3935 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3936 } 3937 3938 if (RequireSharedSpaces) { 3939 warning("Cannot dump shared archive while using shared archive"); 3940 } 3941 UseSharedSpaces = false; 3942 #ifdef _LP64 3943 if (!UseCompressedOops || !UseCompressedClassPointers) { 3944 vm_exit_during_initialization( 3945 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3946 } 3947 } else { 3948 if (!UseCompressedOops || !UseCompressedClassPointers) { 3949 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3950 } 3951 #endif 3952 } 3953 } 3954 3955 // Sharing support 3956 // Construct the path to the archive 3957 static char* get_shared_archive_path() { 3958 char *shared_archive_path; 3959 if (SharedArchiveFile == NULL) { 3960 char jvm_path[JVM_MAXPATHLEN]; 3961 os::jvm_path(jvm_path, sizeof(jvm_path)); 3962 char *end = strrchr(jvm_path, *os::file_separator()); 3963 if (end != NULL) *end = '\0'; 3964 size_t jvm_path_len = strlen(jvm_path); 3965 size_t file_sep_len = strlen(os::file_separator()); 3966 const size_t len = jvm_path_len + file_sep_len + 20; 3967 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3968 if (shared_archive_path != NULL) { 3969 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3970 jvm_path, os::file_separator()); 3971 } 3972 } else { 3973 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3974 } 3975 return shared_archive_path; 3976 } 3977 3978 #ifndef PRODUCT 3979 // Determine whether LogVMOutput should be implicitly turned on. 3980 static bool use_vm_log() { 3981 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3982 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3983 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3984 PrintAssembly || TraceDeoptimization || TraceDependencies || 3985 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3986 return true; 3987 } 3988 3989 #ifdef COMPILER1 3990 if (PrintC1Statistics) { 3991 return true; 3992 } 3993 #endif // COMPILER1 3994 3995 #ifdef COMPILER2 3996 if (PrintOptoAssembly || PrintOptoStatistics) { 3997 return true; 3998 } 3999 #endif // COMPILER2 4000 4001 return false; 4002 } 4003 4004 #endif // PRODUCT 4005 4006 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4007 for (int index = 0; index < args->nOptions; index++) { 4008 const JavaVMOption* option = args->options + index; 4009 const char* tail; 4010 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4011 return true; 4012 } 4013 } 4014 return false; 4015 } 4016 4017 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4018 const char* vm_options_file, 4019 const int vm_options_file_pos, 4020 ScopedVMInitArgs* vm_options_file_args, 4021 ScopedVMInitArgs* args_out) { 4022 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4023 if (code != JNI_OK) { 4024 return code; 4025 } 4026 4027 if (vm_options_file_args->get()->nOptions < 1) { 4028 return JNI_OK; 4029 } 4030 4031 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4032 jio_fprintf(defaultStream::error_stream(), 4033 "A VM options file may not refer to a VM options file. " 4034 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4035 "options file '%s' in options container '%s' is an error.\n", 4036 vm_options_file_args->vm_options_file_arg(), 4037 vm_options_file_args->container_name()); 4038 return JNI_EINVAL; 4039 } 4040 4041 return args_out->insert(args, vm_options_file_args->get(), 4042 vm_options_file_pos); 4043 } 4044 4045 // Expand -XX:VMOptionsFile found in args_in as needed. 4046 // mod_args and args_out parameters may return values as needed. 4047 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4048 ScopedVMInitArgs* mod_args, 4049 JavaVMInitArgs** args_out) { 4050 jint code = match_special_option_and_act(args_in, mod_args); 4051 if (code != JNI_OK) { 4052 return code; 4053 } 4054 4055 if (mod_args->is_set()) { 4056 // args_in contains -XX:VMOptionsFile and mod_args contains the 4057 // original options from args_in along with the options expanded 4058 // from the VMOptionsFile. Return a short-hand to the caller. 4059 *args_out = mod_args->get(); 4060 } else { 4061 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4062 } 4063 return JNI_OK; 4064 } 4065 4066 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4067 ScopedVMInitArgs* args_out) { 4068 // Remaining part of option string 4069 const char* tail; 4070 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4071 4072 for (int index = 0; index < args->nOptions; index++) { 4073 const JavaVMOption* option = args->options + index; 4074 if (ArgumentsExt::process_options(option)) { 4075 continue; 4076 } 4077 if (match_option(option, "-XX:Flags=", &tail)) { 4078 Arguments::set_jvm_flags_file(tail); 4079 continue; 4080 } 4081 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4082 if (vm_options_file_args.found_vm_options_file_arg()) { 4083 jio_fprintf(defaultStream::error_stream(), 4084 "The option '%s' is already specified in the options " 4085 "container '%s' so the specification of '%s' in the " 4086 "same options container is an error.\n", 4087 vm_options_file_args.vm_options_file_arg(), 4088 vm_options_file_args.container_name(), 4089 option->optionString); 4090 return JNI_EINVAL; 4091 } 4092 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4093 // If there's a VMOptionsFile, parse that 4094 jint code = insert_vm_options_file(args, tail, index, 4095 &vm_options_file_args, args_out); 4096 if (code != JNI_OK) { 4097 return code; 4098 } 4099 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4100 if (args_out->is_set()) { 4101 // The VMOptions file inserted some options so switch 'args' 4102 // to the new set of options, and continue processing which 4103 // preserves "last option wins" semantics. 4104 args = args_out->get(); 4105 // The first option from the VMOptionsFile replaces the 4106 // current option. So we back track to process the 4107 // replacement option. 4108 index--; 4109 } 4110 continue; 4111 } 4112 if (match_option(option, "-XX:+PrintVMOptions")) { 4113 PrintVMOptions = true; 4114 continue; 4115 } 4116 if (match_option(option, "-XX:-PrintVMOptions")) { 4117 PrintVMOptions = false; 4118 continue; 4119 } 4120 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4121 IgnoreUnrecognizedVMOptions = true; 4122 continue; 4123 } 4124 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4125 IgnoreUnrecognizedVMOptions = false; 4126 continue; 4127 } 4128 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4129 CommandLineFlags::printFlags(tty, false); 4130 vm_exit(0); 4131 } 4132 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4133 #if INCLUDE_NMT 4134 // The launcher did not setup nmt environment variable properly. 4135 if (!MemTracker::check_launcher_nmt_support(tail)) { 4136 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4137 } 4138 4139 // Verify if nmt option is valid. 4140 if (MemTracker::verify_nmt_option()) { 4141 // Late initialization, still in single-threaded mode. 4142 if (MemTracker::tracking_level() >= NMT_summary) { 4143 MemTracker::init(); 4144 } 4145 } else { 4146 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4147 } 4148 continue; 4149 #else 4150 jio_fprintf(defaultStream::error_stream(), 4151 "Native Memory Tracking is not supported in this VM\n"); 4152 return JNI_ERR; 4153 #endif 4154 } 4155 4156 #ifndef PRODUCT 4157 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4158 CommandLineFlags::printFlags(tty, true); 4159 vm_exit(0); 4160 } 4161 #endif 4162 } 4163 return JNI_OK; 4164 } 4165 4166 static void print_options(const JavaVMInitArgs *args) { 4167 const char* tail; 4168 for (int index = 0; index < args->nOptions; index++) { 4169 const JavaVMOption *option = args->options + index; 4170 if (match_option(option, "-XX:", &tail)) { 4171 logOption(tail); 4172 } 4173 } 4174 } 4175 4176 bool Arguments::handle_deprecated_print_gc_flags() { 4177 if (PrintGC) { 4178 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4179 } 4180 if (PrintGCDetails) { 4181 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4182 } 4183 4184 if (_gc_log_filename != NULL) { 4185 // -Xloggc was used to specify a filename 4186 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4187 4188 LogTarget(Error, logging) target; 4189 LogStreamCHeap errstream(target); 4190 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4191 } else if (PrintGC || PrintGCDetails) { 4192 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4193 } 4194 return true; 4195 } 4196 4197 void Arguments::handle_extra_cms_flags(const char* msg) { 4198 SpecialFlag flag; 4199 const char *flag_name = "UseConcMarkSweepGC"; 4200 if (lookup_special_flag(flag_name, flag)) { 4201 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4202 warning("%s", msg); 4203 } 4204 } 4205 4206 // Parse entry point called from JNI_CreateJavaVM 4207 4208 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4209 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4210 4211 // Initialize ranges, constraints and writeables 4212 CommandLineFlagRangeList::init(); 4213 CommandLineFlagConstraintList::init(); 4214 CommandLineFlagWriteableList::init(); 4215 4216 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4217 const char* hotspotrc = ".hotspotrc"; 4218 bool settings_file_specified = false; 4219 bool needs_hotspotrc_warning = false; 4220 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4221 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4222 4223 // Pointers to current working set of containers 4224 JavaVMInitArgs* cur_cmd_args; 4225 JavaVMInitArgs* cur_java_options_args; 4226 JavaVMInitArgs* cur_java_tool_options_args; 4227 4228 // Containers for modified/expanded options 4229 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4230 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4231 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4232 4233 4234 jint code = 4235 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4236 if (code != JNI_OK) { 4237 return code; 4238 } 4239 4240 code = parse_java_options_environment_variable(&initial_java_options_args); 4241 if (code != JNI_OK) { 4242 return code; 4243 } 4244 4245 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4246 &mod_java_tool_options_args, 4247 &cur_java_tool_options_args); 4248 if (code != JNI_OK) { 4249 return code; 4250 } 4251 4252 code = expand_vm_options_as_needed(initial_cmd_args, 4253 &mod_cmd_args, 4254 &cur_cmd_args); 4255 if (code != JNI_OK) { 4256 return code; 4257 } 4258 4259 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4260 &mod_java_options_args, 4261 &cur_java_options_args); 4262 if (code != JNI_OK) { 4263 return code; 4264 } 4265 4266 const char* flags_file = Arguments::get_jvm_flags_file(); 4267 settings_file_specified = (flags_file != NULL); 4268 4269 if (IgnoreUnrecognizedVMOptions) { 4270 cur_cmd_args->ignoreUnrecognized = true; 4271 cur_java_tool_options_args->ignoreUnrecognized = true; 4272 cur_java_options_args->ignoreUnrecognized = true; 4273 } 4274 4275 // Parse specified settings file 4276 if (settings_file_specified) { 4277 if (!process_settings_file(flags_file, true, 4278 cur_cmd_args->ignoreUnrecognized)) { 4279 return JNI_EINVAL; 4280 } 4281 } else { 4282 #ifdef ASSERT 4283 // Parse default .hotspotrc settings file 4284 if (!process_settings_file(".hotspotrc", false, 4285 cur_cmd_args->ignoreUnrecognized)) { 4286 return JNI_EINVAL; 4287 } 4288 #else 4289 struct stat buf; 4290 if (os::stat(hotspotrc, &buf) == 0) { 4291 needs_hotspotrc_warning = true; 4292 } 4293 #endif 4294 } 4295 4296 if (PrintVMOptions) { 4297 print_options(cur_java_tool_options_args); 4298 print_options(cur_cmd_args); 4299 print_options(cur_java_options_args); 4300 } 4301 4302 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4303 jint result = parse_vm_init_args(cur_java_tool_options_args, 4304 cur_java_options_args, 4305 cur_cmd_args); 4306 4307 if (result != JNI_OK) { 4308 return result; 4309 } 4310 4311 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4312 SharedArchivePath = get_shared_archive_path(); 4313 if (SharedArchivePath == NULL) { 4314 return JNI_ENOMEM; 4315 } 4316 4317 // Set up VerifySharedSpaces 4318 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4319 VerifySharedSpaces = true; 4320 } 4321 4322 // Delay warning until here so that we've had a chance to process 4323 // the -XX:-PrintWarnings flag 4324 if (needs_hotspotrc_warning) { 4325 warning("%s file is present but has been ignored. " 4326 "Run with -XX:Flags=%s to load the file.", 4327 hotspotrc, hotspotrc); 4328 } 4329 4330 if (needs_module_property_warning) { 4331 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4332 " names that are reserved for internal use."); 4333 } 4334 4335 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4336 UNSUPPORTED_OPTION(UseLargePages); 4337 #endif 4338 4339 ArgumentsExt::report_unsupported_options(); 4340 4341 #ifndef PRODUCT 4342 if (TraceBytecodesAt != 0) { 4343 TraceBytecodes = true; 4344 } 4345 if (CountCompiledCalls) { 4346 if (UseCounterDecay) { 4347 warning("UseCounterDecay disabled because CountCalls is set"); 4348 UseCounterDecay = false; 4349 } 4350 } 4351 #endif // PRODUCT 4352 4353 if (ScavengeRootsInCode == 0) { 4354 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4355 warning("Forcing ScavengeRootsInCode non-zero"); 4356 } 4357 ScavengeRootsInCode = 1; 4358 } 4359 4360 if (!handle_deprecated_print_gc_flags()) { 4361 return JNI_EINVAL; 4362 } 4363 4364 // Set object alignment values. 4365 set_object_alignment(); 4366 4367 #if !INCLUDE_CDS 4368 if (DumpSharedSpaces || RequireSharedSpaces) { 4369 jio_fprintf(defaultStream::error_stream(), 4370 "Shared spaces are not supported in this VM\n"); 4371 return JNI_ERR; 4372 } 4373 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4374 warning("Shared spaces are not supported in this VM"); 4375 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4376 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4377 } 4378 no_shared_spaces("CDS Disabled"); 4379 #endif // INCLUDE_CDS 4380 4381 return JNI_OK; 4382 } 4383 4384 jint Arguments::apply_ergo() { 4385 // Set flags based on ergonomics. 4386 set_ergonomics_flags(); 4387 4388 set_shared_spaces_flags(); 4389 4390 // Check the GC selections again. 4391 if (!check_gc_consistency()) { 4392 return JNI_EINVAL; 4393 } 4394 4395 if (TieredCompilation) { 4396 set_tiered_flags(); 4397 } else { 4398 int max_compilation_policy_choice = 1; 4399 #ifdef COMPILER2 4400 max_compilation_policy_choice = 2; 4401 #endif 4402 // Check if the policy is valid. 4403 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4404 vm_exit_during_initialization( 4405 "Incompatible compilation policy selected", NULL); 4406 } 4407 // Scale CompileThreshold 4408 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4409 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4410 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4411 } 4412 } 4413 4414 #ifdef COMPILER2 4415 #ifndef PRODUCT 4416 if (PrintIdealGraphLevel > 0) { 4417 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4418 } 4419 #endif 4420 #endif 4421 4422 // Set heap size based on available physical memory 4423 set_heap_size(); 4424 4425 ArgumentsExt::set_gc_specific_flags(); 4426 4427 // Initialize Metaspace flags and alignments 4428 Metaspace::ergo_initialize(); 4429 4430 // Set bytecode rewriting flags 4431 set_bytecode_flags(); 4432 4433 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4434 jint code = set_aggressive_opts_flags(); 4435 if (code != JNI_OK) { 4436 return code; 4437 } 4438 4439 // Turn off biased locking for locking debug mode flags, 4440 // which are subtly different from each other but neither works with 4441 // biased locking 4442 if (UseHeavyMonitors 4443 #ifdef COMPILER1 4444 || !UseFastLocking 4445 #endif // COMPILER1 4446 #if INCLUDE_JVMCI 4447 || !JVMCIUseFastLocking 4448 #endif 4449 ) { 4450 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4451 // flag set to true on command line; warn the user that they 4452 // can't enable biased locking here 4453 warning("Biased Locking is not supported with locking debug flags" 4454 "; ignoring UseBiasedLocking flag." ); 4455 } 4456 UseBiasedLocking = false; 4457 } 4458 4459 #ifdef CC_INTERP 4460 // Clear flags not supported on zero. 4461 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4462 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4463 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4464 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4465 #endif // CC_INTERP 4466 4467 #ifdef COMPILER2 4468 if (!EliminateLocks) { 4469 EliminateNestedLocks = false; 4470 } 4471 if (!Inline) { 4472 IncrementalInline = false; 4473 } 4474 #ifndef PRODUCT 4475 if (!IncrementalInline) { 4476 AlwaysIncrementalInline = false; 4477 } 4478 #endif 4479 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4480 // nothing to use the profiling, turn if off 4481 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4482 } 4483 #endif 4484 4485 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4486 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4487 DebugNonSafepoints = true; 4488 } 4489 4490 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4491 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4492 } 4493 4494 if (UseOnStackReplacement && !UseLoopCounter) { 4495 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4496 FLAG_SET_DEFAULT(UseLoopCounter, true); 4497 } 4498 4499 #ifndef PRODUCT 4500 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4501 if (use_vm_log()) { 4502 LogVMOutput = true; 4503 } 4504 } 4505 #endif // PRODUCT 4506 4507 if (PrintCommandLineFlags) { 4508 CommandLineFlags::printSetFlags(tty); 4509 } 4510 4511 // Apply CPU specific policy for the BiasedLocking 4512 if (UseBiasedLocking) { 4513 if (!VM_Version::use_biased_locking() && 4514 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4515 UseBiasedLocking = false; 4516 } 4517 } 4518 #ifdef COMPILER2 4519 if (!UseBiasedLocking || EmitSync != 0) { 4520 UseOptoBiasInlining = false; 4521 } 4522 #endif 4523 4524 return JNI_OK; 4525 } 4526 4527 jint Arguments::adjust_after_os() { 4528 if (UseNUMA) { 4529 if (UseParallelGC || UseParallelOldGC) { 4530 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4531 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4532 } 4533 } 4534 // UseNUMAInterleaving is set to ON for all collectors and 4535 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4536 // such as the parallel collector for Linux and Solaris will 4537 // interleave old gen and survivor spaces on top of NUMA 4538 // allocation policy for the eden space. 4539 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4540 // all platforms and ParallelGC on Windows will interleave all 4541 // of the heap spaces across NUMA nodes. 4542 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4543 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4544 } 4545 } 4546 return JNI_OK; 4547 } 4548 4549 int Arguments::PropertyList_count(SystemProperty* pl) { 4550 int count = 0; 4551 while(pl != NULL) { 4552 count++; 4553 pl = pl->next(); 4554 } 4555 return count; 4556 } 4557 4558 // Return the number of readable properties. 4559 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4560 int count = 0; 4561 while(pl != NULL) { 4562 if (pl->is_readable()) { 4563 count++; 4564 } 4565 pl = pl->next(); 4566 } 4567 return count; 4568 } 4569 4570 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4571 assert(key != NULL, "just checking"); 4572 SystemProperty* prop; 4573 for (prop = pl; prop != NULL; prop = prop->next()) { 4574 if (strcmp(key, prop->key()) == 0) return prop->value(); 4575 } 4576 return NULL; 4577 } 4578 4579 // Return the value of the requested property provided that it is a readable property. 4580 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4581 assert(key != NULL, "just checking"); 4582 SystemProperty* prop; 4583 // Return the property value if the keys match and the property is not internal or 4584 // it's the special internal property "jdk.boot.class.path.append". 4585 for (prop = pl; prop != NULL; prop = prop->next()) { 4586 if (strcmp(key, prop->key()) == 0) { 4587 if (!prop->internal()) { 4588 return prop->value(); 4589 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4590 return prop->value(); 4591 } else { 4592 // Property is internal and not jdk.boot.class.path.append so return NULL. 4593 return NULL; 4594 } 4595 } 4596 } 4597 return NULL; 4598 } 4599 4600 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4601 int count = 0; 4602 const char* ret_val = NULL; 4603 4604 while(pl != NULL) { 4605 if(count >= index) { 4606 ret_val = pl->key(); 4607 break; 4608 } 4609 count++; 4610 pl = pl->next(); 4611 } 4612 4613 return ret_val; 4614 } 4615 4616 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4617 int count = 0; 4618 char* ret_val = NULL; 4619 4620 while(pl != NULL) { 4621 if(count >= index) { 4622 ret_val = pl->value(); 4623 break; 4624 } 4625 count++; 4626 pl = pl->next(); 4627 } 4628 4629 return ret_val; 4630 } 4631 4632 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4633 SystemProperty* p = *plist; 4634 if (p == NULL) { 4635 *plist = new_p; 4636 } else { 4637 while (p->next() != NULL) { 4638 p = p->next(); 4639 } 4640 p->set_next(new_p); 4641 } 4642 } 4643 4644 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4645 bool writeable, bool internal) { 4646 if (plist == NULL) 4647 return; 4648 4649 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4650 PropertyList_add(plist, new_p); 4651 } 4652 4653 void Arguments::PropertyList_add(SystemProperty *element) { 4654 PropertyList_add(&_system_properties, element); 4655 } 4656 4657 // This add maintains unique property key in the list. 4658 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4659 PropertyAppendable append, PropertyWriteable writeable, 4660 PropertyInternal internal) { 4661 if (plist == NULL) 4662 return; 4663 4664 // If property key exist then update with new value. 4665 SystemProperty* prop; 4666 for (prop = *plist; prop != NULL; prop = prop->next()) { 4667 if (strcmp(k, prop->key()) == 0) { 4668 if (append == AppendProperty) { 4669 prop->append_value(v); 4670 } else { 4671 prop->set_value(v); 4672 } 4673 return; 4674 } 4675 } 4676 4677 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4678 } 4679 4680 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4681 // Returns true if all of the source pointed by src has been copied over to 4682 // the destination buffer pointed by buf. Otherwise, returns false. 4683 // Notes: 4684 // 1. If the length (buflen) of the destination buffer excluding the 4685 // NULL terminator character is not long enough for holding the expanded 4686 // pid characters, it also returns false instead of returning the partially 4687 // expanded one. 4688 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4689 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4690 char* buf, size_t buflen) { 4691 const char* p = src; 4692 char* b = buf; 4693 const char* src_end = &src[srclen]; 4694 char* buf_end = &buf[buflen - 1]; 4695 4696 while (p < src_end && b < buf_end) { 4697 if (*p == '%') { 4698 switch (*(++p)) { 4699 case '%': // "%%" ==> "%" 4700 *b++ = *p++; 4701 break; 4702 case 'p': { // "%p" ==> current process id 4703 // buf_end points to the character before the last character so 4704 // that we could write '\0' to the end of the buffer. 4705 size_t buf_sz = buf_end - b + 1; 4706 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4707 4708 // if jio_snprintf fails or the buffer is not long enough to hold 4709 // the expanded pid, returns false. 4710 if (ret < 0 || ret >= (int)buf_sz) { 4711 return false; 4712 } else { 4713 b += ret; 4714 assert(*b == '\0', "fail in copy_expand_pid"); 4715 if (p == src_end && b == buf_end + 1) { 4716 // reach the end of the buffer. 4717 return true; 4718 } 4719 } 4720 p++; 4721 break; 4722 } 4723 default : 4724 *b++ = '%'; 4725 } 4726 } else { 4727 *b++ = *p++; 4728 } 4729 } 4730 *b = '\0'; 4731 return (p == src_end); // return false if not all of the source was copied 4732 }