1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "code/codeCacheExtensions.hpp" 31 #include "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genCollectedHeap.hpp" 33 #include "gc/shared/referenceProcessor.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/arguments_ext.hpp" 45 #include "runtime/commandLineFlagConstraintList.hpp" 46 #include "runtime/commandLineFlagWriteableList.hpp" 47 #include "runtime/commandLineFlagRangeList.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/globals_extension.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/defaultStream.hpp" 56 #include "utilities/macros.hpp" 57 #include "utilities/stringUtils.hpp" 58 #if INCLUDE_JVMCI 59 #include "jvmci/jvmciRuntime.hpp" 60 #endif 61 #if INCLUDE_ALL_GCS 62 #include "gc/cms/compactibleFreeListSpace.hpp" 63 #include "gc/g1/g1CollectedHeap.inline.hpp" 64 #include "gc/parallel/parallelScavengeHeap.hpp" 65 #endif // INCLUDE_ALL_GCS 66 67 // Note: This is a special bug reporting site for the JVM 68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 bool Arguments::_has_profile = false; 80 size_t Arguments::_conservative_max_heap_alignment = 0; 81 size_t Arguments::_min_heap_size = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args() 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98 char* Arguments::SharedArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 abort_hook_t Arguments::_abort_hook = NULL; 104 exit_hook_t Arguments::_exit_hook = NULL; 105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108 SystemProperty *Arguments::_sun_boot_library_path = NULL; 109 SystemProperty *Arguments::_java_library_path = NULL; 110 SystemProperty *Arguments::_java_home = NULL; 111 SystemProperty *Arguments::_java_class_path = NULL; 112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 113 114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 115 PathString *Arguments::_system_boot_class_path = NULL; 116 bool Arguments::_has_jimage = false; 117 118 char* Arguments::_ext_dirs = NULL; 119 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 121 // part of the option string. 122 static bool match_option(const JavaVMOption *option, const char* name, 123 const char** tail) { 124 size_t len = strlen(name); 125 if (strncmp(option->optionString, name, len) == 0) { 126 *tail = option->optionString + len; 127 return true; 128 } else { 129 return false; 130 } 131 } 132 133 // Check if 'option' matches 'name'. No "tail" is allowed. 134 static bool match_option(const JavaVMOption *option, const char* name) { 135 const char* tail = NULL; 136 bool result = match_option(option, name, &tail); 137 if (tail != NULL && *tail == '\0') { 138 return result; 139 } else { 140 return false; 141 } 142 } 143 144 // Return true if any of the strings in null-terminated array 'names' matches. 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 146 // the option must match exactly. 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 148 bool tail_allowed) { 149 for (/* empty */; *names != NULL; ++names) { 150 if (match_option(option, *names, tail)) { 151 if (**tail == '\0' || tail_allowed && **tail == ':') { 152 return true; 153 } 154 } 155 } 156 return false; 157 } 158 159 static void logOption(const char* opt) { 160 if (PrintVMOptions) { 161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 162 } 163 } 164 165 bool needs_module_property_warning = false; 166 167 #define MODULE_PROPERTY_PREFIX "jdk.module." 168 #define MODULE_PROPERTY_PREFIX_LEN 11 169 #define ADDEXPORTS "addexports" 170 #define ADDEXPORTS_LEN 10 171 #define ADDREADS "addreads" 172 #define ADDREADS_LEN 8 173 #define PATCH "patch" 174 #define PATCH_LEN 5 175 #define ADDMODS "addmods" 176 #define ADDMODS_LEN 7 177 #define LIMITMODS "limitmods" 178 #define LIMITMODS_LEN 9 179 #define PATH "path" 180 #define PATH_LEN 4 181 #define UPGRADE_PATH "upgrade.path" 182 #define UPGRADE_PATH_LEN 12 183 184 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 185 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 186 return ((strncmp(option, property, len) == 0) && 187 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 188 } 189 190 // Return true if property starts with "jdk.module." and its ensuing chars match 191 // any of the reserved module properties. 192 // property should be passed without the leading "-D". 193 bool Arguments::is_internal_module_property(const char* property) { 194 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 195 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 196 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 197 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 198 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 199 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 200 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 201 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 202 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 203 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 204 return true; 205 } 206 } 207 return false; 208 } 209 210 // Process java launcher properties. 211 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 212 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 213 // sun.java.launcher.pid is defined. 214 // Must do this before setting up other system properties, 215 // as some of them may depend on launcher type. 216 for (int index = 0; index < args->nOptions; index++) { 217 const JavaVMOption* option = args->options + index; 218 const char* tail; 219 220 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 221 process_java_launcher_argument(tail, option->extraInfo); 222 continue; 223 } 224 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 225 if (strcmp(tail, "true") == 0) { 226 _sun_java_launcher_is_altjvm = true; 227 } 228 continue; 229 } 230 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 231 _sun_java_launcher_pid = atoi(tail); 232 continue; 233 } 234 } 235 } 236 237 // Initialize system properties key and value. 238 void Arguments::init_system_properties() { 239 240 // Set up _system_boot_class_path which is not a property but 241 // relies heavily on argument processing and the jdk.boot.class.path.append 242 // property. It is used to store the underlying system boot class path. 243 _system_boot_class_path = new PathString(NULL); 244 245 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 246 "Java Virtual Machine Specification", false)); 247 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 250 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 251 252 // Following are JVMTI agent writable properties. 253 // Properties values are set to NULL and they are 254 // os specific they are initialized in os::init_system_properties_values(). 255 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 256 _java_library_path = new SystemProperty("java.library.path", NULL, true); 257 _java_home = new SystemProperty("java.home", NULL, true); 258 _java_class_path = new SystemProperty("java.class.path", "", true); 259 // jdk.boot.class.path.append is a non-writeable, internal property. 260 // It can only be set by either: 261 // - -Xbootclasspath/a: 262 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 263 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 264 265 // Add to System Property list. 266 PropertyList_add(&_system_properties, _sun_boot_library_path); 267 PropertyList_add(&_system_properties, _java_library_path); 268 PropertyList_add(&_system_properties, _java_home); 269 PropertyList_add(&_system_properties, _java_class_path); 270 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 271 272 // Set OS specific system properties values 273 os::init_system_properties_values(); 274 } 275 276 // Update/Initialize System properties after JDK version number is known 277 void Arguments::init_version_specific_system_properties() { 278 enum { bufsz = 16 }; 279 char buffer[bufsz]; 280 const char* spec_vendor = "Oracle Corporation"; 281 uint32_t spec_version = JDK_Version::current().major_version(); 282 283 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 284 285 PropertyList_add(&_system_properties, 286 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 287 PropertyList_add(&_system_properties, 288 new SystemProperty("java.vm.specification.version", buffer, false)); 289 PropertyList_add(&_system_properties, 290 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 291 } 292 293 /* 294 * -XX argument processing: 295 * 296 * -XX arguments are defined in several places, such as: 297 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 298 * -XX arguments are parsed in parse_argument(). 299 * -XX argument bounds checking is done in check_vm_args_consistency(). 300 * 301 * Over time -XX arguments may change. There are mechanisms to handle common cases: 302 * 303 * ALIASED: An option that is simply another name for another option. This is often 304 * part of the process of deprecating a flag, but not all aliases need 305 * to be deprecated. 306 * 307 * Create an alias for an option by adding the old and new option names to the 308 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 309 * 310 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 311 * support may be removed in the future. Both regular and aliased options may be 312 * deprecated. 313 * 314 * Add a deprecation warning for an option (or alias) by adding an entry in the 315 * "special_jvm_flags" table and setting the "deprecated_in" field. 316 * Often an option "deprecated" in one major release will 317 * be made "obsolete" in the next. In this case the entry should also have it's 318 * "obsolete_in" field set. 319 * 320 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 321 * on the command line. A warning is printed to let the user know that option might not 322 * be accepted in the future. 323 * 324 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 325 * table and setting the "obsolete_in" field. 326 * 327 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 328 * to the current JDK version. The system will flatly refuse to admit the existence of 329 * the flag. This allows a flag to die automatically over JDK releases. 330 * 331 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 332 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 333 * - Newly obsolete or expired deprecated options should have their global variable 334 * definitions removed (from globals.hpp, etc) and related implementations removed. 335 * 336 * Recommended approach for removing options: 337 * 338 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 339 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 340 * 341 * To remove internal options (e.g. diagnostic, experimental, develop options), use 342 * a 2-step model adding major release numbers to the obsolete and expire columns. 343 * 344 * To change the name of an option, use the alias table as well as a 2-step 345 * model adding major release numbers to the deprecate and expire columns. 346 * Think twice about aliasing commonly used customer options. 347 * 348 * There are times when it is appropriate to leave a future release number as undefined. 349 * 350 * Tests: Aliases should be tested in VMAliasOptions.java. 351 * Deprecated options should be tested in VMDeprecatedOptions.java. 352 */ 353 354 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 355 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 356 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 357 // the command-line as usual, but will issue a warning. 358 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 359 // the command-line, while issuing a warning and ignoring the flag value. 360 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 361 // existence of the flag. 362 // 363 // MANUAL CLEANUP ON JDK VERSION UPDATES: 364 // This table ensures that the handling of options will update automatically when the JDK 365 // version is incremented, but the source code needs to be cleanup up manually: 366 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 367 // variable should be removed, as well as users of the variable. 368 // - As "deprecated" options age into "obsolete" options, move the entry into the 369 // "Obsolete Flags" section of the table. 370 // - All expired options should be removed from the table. 371 static SpecialFlag const special_jvm_flags[] = { 372 // -------------- Deprecated Flags -------------- 373 // --- Non-alias flags - sorted by obsolete_in then expired_in: 374 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 375 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 376 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 377 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 378 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 379 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 380 381 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 382 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 383 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 384 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 385 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 386 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 387 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 388 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 389 390 // -------------- Obsolete Flags - sorted by expired_in -------------- 391 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 392 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 393 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 394 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 395 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 396 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 397 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 398 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 399 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 400 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 401 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 402 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 403 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 404 #ifndef ZERO 405 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 406 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 407 #endif // ZERO 408 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 409 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 410 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 411 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 412 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 413 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 414 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 415 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 416 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 417 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 418 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 419 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) }, 420 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) }, 421 422 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 423 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 424 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 425 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 426 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 427 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 428 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 429 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 430 #endif 431 432 { NULL, JDK_Version(0), JDK_Version(0) } 433 }; 434 435 // Flags that are aliases for other flags. 436 typedef struct { 437 const char* alias_name; 438 const char* real_name; 439 } AliasedFlag; 440 441 static AliasedFlag const aliased_jvm_flags[] = { 442 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 443 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 444 { "CMSMarkStackSize", "MarkStackSize" }, 445 { "G1MarkStackSize", "MarkStackSize" }, 446 { "ParallelMarkingThreads", "ConcGCThreads" }, 447 { "ParallelCMSThreads", "ConcGCThreads" }, 448 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 449 { NULL, NULL} 450 }; 451 452 // NOTE: A compatibility request will be necessary for each alias to be removed. 453 static AliasedLoggingFlag const aliased_logging_flags[] = { 454 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 455 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 456 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 457 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 458 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 459 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 460 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 461 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 462 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 463 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 464 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 465 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 466 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 467 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 468 }; 469 470 #ifndef PRODUCT 471 // These options are removed in jdk9. Remove this code for jdk10. 472 static AliasedFlag const removed_develop_logging_flags[] = { 473 { "TraceClassInitialization", "-Xlog:class+init" }, 474 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 475 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 476 { "TraceItables", "-Xlog:itables=debug" }, 477 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 478 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 479 { "TraceStartupTime", "-Xlog:startuptime" }, 480 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 481 { "PrintVtables", "-Xlog:vtables=debug" }, 482 { "VerboseVerification", "-Xlog:verification" }, 483 { NULL, NULL } 484 }; 485 #endif //PRODUCT 486 487 // Return true if "v" is less than "other", where "other" may be "undefined". 488 static bool version_less_than(JDK_Version v, JDK_Version other) { 489 assert(!v.is_undefined(), "must be defined"); 490 if (!other.is_undefined() && v.compare(other) >= 0) { 491 return false; 492 } else { 493 return true; 494 } 495 } 496 497 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 498 499 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 500 // Allow extensions to have priority 501 if (lookup_special_flag_ext(flag_name, flag)) { 502 return true; 503 } 504 505 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 506 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 507 flag = special_jvm_flags[i]; 508 return true; 509 } 510 } 511 return false; 512 } 513 514 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 515 assert(version != NULL, "Must provide a version buffer"); 516 SpecialFlag flag; 517 if (lookup_special_flag(flag_name, flag)) { 518 if (!flag.obsolete_in.is_undefined()) { 519 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 520 *version = flag.obsolete_in; 521 return true; 522 } 523 } 524 } 525 return false; 526 } 527 528 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 529 assert(version != NULL, "Must provide a version buffer"); 530 SpecialFlag flag; 531 if (lookup_special_flag(flag_name, flag)) { 532 if (!flag.deprecated_in.is_undefined()) { 533 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 534 version_less_than(JDK_Version::current(), flag.expired_in)) { 535 *version = flag.deprecated_in; 536 return 1; 537 } else { 538 return -1; 539 } 540 } 541 } 542 return 0; 543 } 544 545 #ifndef PRODUCT 546 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 547 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 548 const AliasedFlag& flag = removed_develop_logging_flags[i]; 549 if (strcmp(flag.alias_name, name) == 0) { 550 return flag.real_name; 551 } 552 } 553 return NULL; 554 } 555 #endif // PRODUCT 556 557 const char* Arguments::real_flag_name(const char *flag_name) { 558 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 559 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 560 if (strcmp(flag_status.alias_name, flag_name) == 0) { 561 return flag_status.real_name; 562 } 563 } 564 return flag_name; 565 } 566 567 #ifdef ASSERT 568 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 569 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 570 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 571 return true; 572 } 573 } 574 return false; 575 } 576 577 static bool verify_special_jvm_flags() { 578 bool success = true; 579 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 580 const SpecialFlag& flag = special_jvm_flags[i]; 581 if (lookup_special_flag(flag.name, i)) { 582 warning("Duplicate special flag declaration \"%s\"", flag.name); 583 success = false; 584 } 585 if (flag.deprecated_in.is_undefined() && 586 flag.obsolete_in.is_undefined()) { 587 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 588 success = false; 589 } 590 591 if (!flag.deprecated_in.is_undefined()) { 592 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 593 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 594 success = false; 595 } 596 597 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 598 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 599 success = false; 600 } 601 } 602 603 if (!flag.obsolete_in.is_undefined()) { 604 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 605 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 606 success = false; 607 } 608 609 // if flag has become obsolete it should not have a "globals" flag defined anymore. 610 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 611 if (Flag::find_flag(flag.name) != NULL) { 612 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 613 success = false; 614 } 615 } 616 } 617 618 if (!flag.expired_in.is_undefined()) { 619 // if flag has become expired it should not have a "globals" flag defined anymore. 620 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 621 if (Flag::find_flag(flag.name) != NULL) { 622 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 623 success = false; 624 } 625 } 626 } 627 628 } 629 return success; 630 } 631 #endif 632 633 // Parses a size specification string. 634 bool Arguments::atojulong(const char *s, julong* result) { 635 julong n = 0; 636 637 // First char must be a digit. Don't allow negative numbers or leading spaces. 638 if (!isdigit(*s)) { 639 return false; 640 } 641 642 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 643 char* remainder; 644 errno = 0; 645 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 646 if (errno != 0) { 647 return false; 648 } 649 650 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 651 if (remainder == s || strlen(remainder) > 1) { 652 return false; 653 } 654 655 switch (*remainder) { 656 case 'T': case 't': 657 *result = n * G * K; 658 // Check for overflow. 659 if (*result/((julong)G * K) != n) return false; 660 return true; 661 case 'G': case 'g': 662 *result = n * G; 663 if (*result/G != n) return false; 664 return true; 665 case 'M': case 'm': 666 *result = n * M; 667 if (*result/M != n) return false; 668 return true; 669 case 'K': case 'k': 670 *result = n * K; 671 if (*result/K != n) return false; 672 return true; 673 case '\0': 674 *result = n; 675 return true; 676 default: 677 return false; 678 } 679 } 680 681 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 682 if (size < min_size) return arg_too_small; 683 // Check that size will fit in a size_t (only relevant on 32-bit) 684 if (size > max_uintx) return arg_too_big; 685 return arg_in_range; 686 } 687 688 // Describe an argument out of range error 689 void Arguments::describe_range_error(ArgsRange errcode) { 690 switch(errcode) { 691 case arg_too_big: 692 jio_fprintf(defaultStream::error_stream(), 693 "The specified size exceeds the maximum " 694 "representable size.\n"); 695 break; 696 case arg_too_small: 697 case arg_unreadable: 698 case arg_in_range: 699 // do nothing for now 700 break; 701 default: 702 ShouldNotReachHere(); 703 } 704 } 705 706 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 707 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 708 return true; 709 } else { 710 return false; 711 } 712 } 713 714 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 715 char* end; 716 errno = 0; 717 double v = strtod(value, &end); 718 if ((errno != 0) || (*end != 0)) { 719 return false; 720 } 721 722 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 723 return true; 724 } 725 return false; 726 } 727 728 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 729 julong v; 730 int int_v; 731 intx intx_v; 732 bool is_neg = false; 733 Flag* result = Flag::find_flag(name, strlen(name)); 734 735 if (result == NULL) { 736 return false; 737 } 738 739 // Check the sign first since atojulong() parses only unsigned values. 740 if (*value == '-') { 741 if (!result->is_intx() && !result->is_int()) { 742 return false; 743 } 744 value++; 745 is_neg = true; 746 } 747 if (!Arguments::atojulong(value, &v)) { 748 return false; 749 } 750 if (result->is_int()) { 751 int_v = (int) v; 752 if (is_neg) { 753 int_v = -int_v; 754 } 755 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 756 } else if (result->is_uint()) { 757 uint uint_v = (uint) v; 758 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 759 } else if (result->is_intx()) { 760 intx_v = (intx) v; 761 if (is_neg) { 762 intx_v = -intx_v; 763 } 764 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 765 } else if (result->is_uintx()) { 766 uintx uintx_v = (uintx) v; 767 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 768 } else if (result->is_uint64_t()) { 769 uint64_t uint64_t_v = (uint64_t) v; 770 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 771 } else if (result->is_size_t()) { 772 size_t size_t_v = (size_t) v; 773 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 774 } else { 775 return false; 776 } 777 } 778 779 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 780 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 781 // Contract: CommandLineFlags always returns a pointer that needs freeing. 782 FREE_C_HEAP_ARRAY(char, value); 783 return true; 784 } 785 786 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 787 const char* old_value = ""; 788 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 789 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 790 size_t new_len = strlen(new_value); 791 const char* value; 792 char* free_this_too = NULL; 793 if (old_len == 0) { 794 value = new_value; 795 } else if (new_len == 0) { 796 value = old_value; 797 } else { 798 size_t length = old_len + 1 + new_len + 1; 799 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 800 // each new setting adds another LINE to the switch: 801 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 802 value = buf; 803 free_this_too = buf; 804 } 805 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 806 // CommandLineFlags always returns a pointer that needs freeing. 807 FREE_C_HEAP_ARRAY(char, value); 808 if (free_this_too != NULL) { 809 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 810 FREE_C_HEAP_ARRAY(char, free_this_too); 811 } 812 return true; 813 } 814 815 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 816 const char* real_name = real_flag_name(arg); 817 JDK_Version since = JDK_Version(); 818 switch (is_deprecated_flag(arg, &since)) { 819 case -1: 820 return NULL; // obsolete or expired, don't process normally 821 case 0: 822 return real_name; 823 case 1: { 824 if (warn) { 825 char version[256]; 826 since.to_string(version, sizeof(version)); 827 if (real_name != arg) { 828 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 829 arg, version, real_name); 830 } else { 831 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 832 arg, version); 833 } 834 } 835 return real_name; 836 } 837 } 838 ShouldNotReachHere(); 839 return NULL; 840 } 841 842 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 843 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 844 // Set tagset string buffer at max size of 256, large enough for any alias tagset 845 const int max_tagset_size = 256; 846 int max_tagset_len = max_tagset_size - 1; 847 char tagset_buffer[max_tagset_size]; 848 tagset_buffer[0] = '\0'; 849 850 // Write tag-set for aliased logging option, in string list form 851 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 852 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 853 if (i > 0) { 854 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 855 } 856 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 857 } 858 if (!alf.exactMatch) { 859 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 860 } 861 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 862 (on) ? "+" : "-", 863 name, 864 tagset_buffer, 865 (on) ? LogLevel::name(alf.level) : "off"); 866 } 867 868 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 869 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 870 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 871 if (strcmp(alf.alias_name, name) == 0) { 872 log_deprecated_flag(name, on, alf); 873 return alf; 874 } 875 } 876 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 877 return a; 878 } 879 880 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 881 882 // range of acceptable characters spelled out for portability reasons 883 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 884 #define BUFLEN 255 885 char name[BUFLEN+1]; 886 char dummy; 887 const char* real_name; 888 bool warn_if_deprecated = true; 889 890 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 891 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 892 if (alf.alias_name != NULL){ 893 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 894 return true; 895 } 896 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 897 if (real_name == NULL) { 898 return false; 899 } 900 return set_bool_flag(real_name, false, origin); 901 } 902 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 903 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 904 if (alf.alias_name != NULL){ 905 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 906 return true; 907 } 908 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 909 if (real_name == NULL) { 910 return false; 911 } 912 return set_bool_flag(real_name, true, origin); 913 } 914 915 char punct; 916 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 917 const char* value = strchr(arg, '=') + 1; 918 Flag* flag; 919 920 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 921 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 922 if (alf.alias_name != NULL) { 923 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 924 return true; 925 } 926 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 927 if (real_name == NULL) { 928 return false; 929 } 930 flag = Flag::find_flag(real_name); 931 if (flag != NULL && flag->is_ccstr()) { 932 if (flag->ccstr_accumulates()) { 933 return append_to_string_flag(real_name, value, origin); 934 } else { 935 if (value[0] == '\0') { 936 value = NULL; 937 } 938 return set_string_flag(real_name, value, origin); 939 } 940 } else { 941 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 942 } 943 } 944 945 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 946 const char* value = strchr(arg, '=') + 1; 947 // -XX:Foo:=xxx will reset the string flag to the given value. 948 if (value[0] == '\0') { 949 value = NULL; 950 } 951 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 952 if (real_name == NULL) { 953 return false; 954 } 955 return set_string_flag(real_name, value, origin); 956 } 957 958 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 959 #define SIGNED_NUMBER_RANGE "[-0123456789]" 960 #define NUMBER_RANGE "[0123456789eE+-]" 961 char value[BUFLEN + 1]; 962 char value2[BUFLEN + 1]; 963 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 964 // Looks like a floating-point number -- try again with more lenient format string 965 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 966 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 967 if (real_name == NULL) { 968 return false; 969 } 970 return set_fp_numeric_flag(real_name, value, origin); 971 } 972 } 973 974 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 975 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 976 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 977 if (real_name == NULL) { 978 return false; 979 } 980 return set_numeric_flag(real_name, value, origin); 981 } 982 983 return false; 984 } 985 986 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 987 assert(bldarray != NULL, "illegal argument"); 988 989 if (arg == NULL) { 990 return; 991 } 992 993 int new_count = *count + 1; 994 995 // expand the array and add arg to the last element 996 if (*bldarray == NULL) { 997 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 998 } else { 999 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1000 } 1001 (*bldarray)[*count] = os::strdup_check_oom(arg); 1002 *count = new_count; 1003 } 1004 1005 void Arguments::build_jvm_args(const char* arg) { 1006 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1007 } 1008 1009 void Arguments::build_jvm_flags(const char* arg) { 1010 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1011 } 1012 1013 // utility function to return a string that concatenates all 1014 // strings in a given char** array 1015 const char* Arguments::build_resource_string(char** args, int count) { 1016 if (args == NULL || count == 0) { 1017 return NULL; 1018 } 1019 size_t length = 0; 1020 for (int i = 0; i < count; i++) { 1021 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1022 } 1023 char* s = NEW_RESOURCE_ARRAY(char, length); 1024 char* dst = s; 1025 for (int j = 0; j < count; j++) { 1026 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1027 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1028 dst += offset; 1029 length -= offset; 1030 } 1031 return (const char*) s; 1032 } 1033 1034 void Arguments::print_on(outputStream* st) { 1035 st->print_cr("VM Arguments:"); 1036 if (num_jvm_flags() > 0) { 1037 st->print("jvm_flags: "); print_jvm_flags_on(st); 1038 st->cr(); 1039 } 1040 if (num_jvm_args() > 0) { 1041 st->print("jvm_args: "); print_jvm_args_on(st); 1042 st->cr(); 1043 } 1044 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1045 if (_java_class_path != NULL) { 1046 char* path = _java_class_path->value(); 1047 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1048 } 1049 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1050 } 1051 1052 void Arguments::print_summary_on(outputStream* st) { 1053 // Print the command line. Environment variables that are helpful for 1054 // reproducing the problem are written later in the hs_err file. 1055 // flags are from setting file 1056 if (num_jvm_flags() > 0) { 1057 st->print_raw("Settings File: "); 1058 print_jvm_flags_on(st); 1059 st->cr(); 1060 } 1061 // args are the command line and environment variable arguments. 1062 st->print_raw("Command Line: "); 1063 if (num_jvm_args() > 0) { 1064 print_jvm_args_on(st); 1065 } 1066 // this is the classfile and any arguments to the java program 1067 if (java_command() != NULL) { 1068 st->print("%s", java_command()); 1069 } 1070 st->cr(); 1071 } 1072 1073 void Arguments::print_jvm_flags_on(outputStream* st) { 1074 if (_num_jvm_flags > 0) { 1075 for (int i=0; i < _num_jvm_flags; i++) { 1076 st->print("%s ", _jvm_flags_array[i]); 1077 } 1078 } 1079 } 1080 1081 void Arguments::print_jvm_args_on(outputStream* st) { 1082 if (_num_jvm_args > 0) { 1083 for (int i=0; i < _num_jvm_args; i++) { 1084 st->print("%s ", _jvm_args_array[i]); 1085 } 1086 } 1087 } 1088 1089 bool Arguments::process_argument(const char* arg, 1090 jboolean ignore_unrecognized, 1091 Flag::Flags origin) { 1092 JDK_Version since = JDK_Version(); 1093 1094 if (parse_argument(arg, origin)) { 1095 return true; 1096 } 1097 1098 // Determine if the flag has '+', '-', or '=' characters. 1099 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1100 const char* const argname = has_plus_minus ? arg + 1 : arg; 1101 1102 size_t arg_len; 1103 const char* equal_sign = strchr(argname, '='); 1104 if (equal_sign == NULL) { 1105 arg_len = strlen(argname); 1106 } else { 1107 arg_len = equal_sign - argname; 1108 } 1109 1110 // Only make the obsolete check for valid arguments. 1111 if (arg_len <= BUFLEN) { 1112 // Construct a string which consists only of the argument name without '+', '-', or '='. 1113 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1114 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1115 if (is_obsolete_flag(stripped_argname, &since)) { 1116 char version[256]; 1117 since.to_string(version, sizeof(version)); 1118 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1119 return true; 1120 } 1121 #ifndef PRODUCT 1122 else { 1123 const char* replacement; 1124 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1125 log_warning(arguments)("%s has been removed. Please use %s instead.", 1126 stripped_argname, 1127 replacement); 1128 return false; 1129 } 1130 } 1131 #endif //PRODUCT 1132 } 1133 1134 // For locked flags, report a custom error message if available. 1135 // Otherwise, report the standard unrecognized VM option. 1136 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1137 if (found_flag != NULL) { 1138 char locked_message_buf[BUFLEN]; 1139 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1140 if (strlen(locked_message_buf) == 0) { 1141 if (found_flag->is_bool() && !has_plus_minus) { 1142 jio_fprintf(defaultStream::error_stream(), 1143 "Missing +/- setting for VM option '%s'\n", argname); 1144 } else if (!found_flag->is_bool() && has_plus_minus) { 1145 jio_fprintf(defaultStream::error_stream(), 1146 "Unexpected +/- setting in VM option '%s'\n", argname); 1147 } else { 1148 jio_fprintf(defaultStream::error_stream(), 1149 "Improperly specified VM option '%s'\n", argname); 1150 } 1151 } else { 1152 #ifdef PRODUCT 1153 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1154 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1155 if (ignore_unrecognized && mismatched) { 1156 return true; 1157 } 1158 #endif 1159 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1160 } 1161 } else { 1162 if (ignore_unrecognized) { 1163 return true; 1164 } 1165 jio_fprintf(defaultStream::error_stream(), 1166 "Unrecognized VM option '%s'\n", argname); 1167 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1168 if (fuzzy_matched != NULL) { 1169 jio_fprintf(defaultStream::error_stream(), 1170 "Did you mean '%s%s%s'? ", 1171 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1172 fuzzy_matched->_name, 1173 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1174 } 1175 } 1176 1177 // allow for commandline "commenting out" options like -XX:#+Verbose 1178 return arg[0] == '#'; 1179 } 1180 1181 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1182 FILE* stream = fopen(file_name, "rb"); 1183 if (stream == NULL) { 1184 if (should_exist) { 1185 jio_fprintf(defaultStream::error_stream(), 1186 "Could not open settings file %s\n", file_name); 1187 return false; 1188 } else { 1189 return true; 1190 } 1191 } 1192 1193 char token[1024]; 1194 int pos = 0; 1195 1196 bool in_white_space = true; 1197 bool in_comment = false; 1198 bool in_quote = false; 1199 char quote_c = 0; 1200 bool result = true; 1201 1202 int c = getc(stream); 1203 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1204 if (in_white_space) { 1205 if (in_comment) { 1206 if (c == '\n') in_comment = false; 1207 } else { 1208 if (c == '#') in_comment = true; 1209 else if (!isspace(c)) { 1210 in_white_space = false; 1211 token[pos++] = c; 1212 } 1213 } 1214 } else { 1215 if (c == '\n' || (!in_quote && isspace(c))) { 1216 // token ends at newline, or at unquoted whitespace 1217 // this allows a way to include spaces in string-valued options 1218 token[pos] = '\0'; 1219 logOption(token); 1220 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1221 build_jvm_flags(token); 1222 pos = 0; 1223 in_white_space = true; 1224 in_quote = false; 1225 } else if (!in_quote && (c == '\'' || c == '"')) { 1226 in_quote = true; 1227 quote_c = c; 1228 } else if (in_quote && (c == quote_c)) { 1229 in_quote = false; 1230 } else { 1231 token[pos++] = c; 1232 } 1233 } 1234 c = getc(stream); 1235 } 1236 if (pos > 0) { 1237 token[pos] = '\0'; 1238 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1239 build_jvm_flags(token); 1240 } 1241 fclose(stream); 1242 return result; 1243 } 1244 1245 //============================================================================================================= 1246 // Parsing of properties (-D) 1247 1248 const char* Arguments::get_property(const char* key) { 1249 return PropertyList_get_value(system_properties(), key); 1250 } 1251 1252 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1253 const char* eq = strchr(prop, '='); 1254 const char* key; 1255 const char* value = ""; 1256 1257 if (eq == NULL) { 1258 // property doesn't have a value, thus use passed string 1259 key = prop; 1260 } else { 1261 // property have a value, thus extract it and save to the 1262 // allocated string 1263 size_t key_len = eq - prop; 1264 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1265 1266 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1267 key = tmp_key; 1268 1269 value = &prop[key_len + 1]; 1270 } 1271 1272 if (strcmp(key, "java.compiler") == 0) { 1273 process_java_compiler_argument(value); 1274 // Record value in Arguments, but let it get passed to Java. 1275 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1276 strcmp(key, "sun.java.launcher.pid") == 0) { 1277 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1278 // private and are processed in process_sun_java_launcher_properties(); 1279 // the sun.java.launcher property is passed on to the java application 1280 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1281 // append is true, writable is true, internal is false 1282 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1283 WriteableProperty, ExternalProperty); 1284 } else { 1285 if (strcmp(key, "sun.java.command") == 0) { 1286 char *old_java_command = _java_command; 1287 _java_command = os::strdup_check_oom(value, mtArguments); 1288 if (old_java_command != NULL) { 1289 os::free(old_java_command); 1290 } 1291 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1292 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1293 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1294 // its value without going through the property list or making a Java call. 1295 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1296 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1297 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1298 os::free((void *)old_java_vendor_url_bug); 1299 } 1300 } 1301 1302 // Create new property and add at the end of the list 1303 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1304 } 1305 1306 if (key != prop) { 1307 // SystemProperty copy passed value, thus free previously allocated 1308 // memory 1309 FreeHeap((void *)key); 1310 } 1311 1312 return true; 1313 } 1314 1315 #if INCLUDE_CDS 1316 void Arguments::check_unsupported_dumping_properties() { 1317 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1318 const char* unsupported_properties[] = { "jdk.module.main", 1319 "jdk.module.limitmods", 1320 "jdk.module.path", 1321 "jdk.module.upgrade.path", 1322 "jdk.module.addmods.0" }; 1323 const char* unsupported_options[] = { "-m", 1324 "--limit-modules", 1325 "--module-path", 1326 "--upgrade-module-path", 1327 "--add-modules" }; 1328 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1329 // If a vm option is found in the unsupported_options array with index less than the warning_idx, 1330 // vm will exit with an error message. Otherwise, it will result in a warning message. 1331 uint warning_idx = 2; 1332 SystemProperty* sp = system_properties(); 1333 while (sp != NULL) { 1334 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1335 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1336 if (i < warning_idx) { 1337 vm_exit_during_initialization( 1338 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1339 } else { 1340 warning( 1341 "the %s option is ignored when dumping the shared archive", unsupported_options[i]); 1342 } 1343 } 1344 } 1345 sp = sp->next(); 1346 } 1347 1348 // Check for an exploded module build in use with -Xshare:dump. 1349 if (!has_jimage()) { 1350 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1351 } 1352 } 1353 #endif 1354 1355 //=========================================================================================================== 1356 // Setting int/mixed/comp mode flags 1357 1358 void Arguments::set_mode_flags(Mode mode) { 1359 // Set up default values for all flags. 1360 // If you add a flag to any of the branches below, 1361 // add a default value for it here. 1362 set_java_compiler(false); 1363 _mode = mode; 1364 1365 // Ensure Agent_OnLoad has the correct initial values. 1366 // This may not be the final mode; mode may change later in onload phase. 1367 PropertyList_unique_add(&_system_properties, "java.vm.info", 1368 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1369 1370 UseInterpreter = true; 1371 UseCompiler = true; 1372 UseLoopCounter = true; 1373 1374 // Default values may be platform/compiler dependent - 1375 // use the saved values 1376 ClipInlining = Arguments::_ClipInlining; 1377 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1378 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1379 BackgroundCompilation = Arguments::_BackgroundCompilation; 1380 if (TieredCompilation) { 1381 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1382 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1383 } 1384 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1385 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1386 } 1387 } 1388 1389 // Change from defaults based on mode 1390 switch (mode) { 1391 default: 1392 ShouldNotReachHere(); 1393 break; 1394 case _int: 1395 UseCompiler = false; 1396 UseLoopCounter = false; 1397 AlwaysCompileLoopMethods = false; 1398 UseOnStackReplacement = false; 1399 break; 1400 case _mixed: 1401 // same as default 1402 break; 1403 case _comp: 1404 UseInterpreter = false; 1405 BackgroundCompilation = false; 1406 ClipInlining = false; 1407 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1408 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1409 // compile a level 4 (C2) and then continue executing it. 1410 if (TieredCompilation) { 1411 Tier3InvokeNotifyFreqLog = 0; 1412 Tier4InvocationThreshold = 0; 1413 } 1414 break; 1415 } 1416 } 1417 1418 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS 1419 // Conflict: required to use shared spaces (-Xshare:on), but 1420 // incompatible command line options were chosen. 1421 1422 static void no_shared_spaces(const char* message) { 1423 if (RequireSharedSpaces) { 1424 jio_fprintf(defaultStream::error_stream(), 1425 "Class data sharing is inconsistent with other specified options.\n"); 1426 vm_exit_during_initialization("Unable to use shared archive.", message); 1427 } else { 1428 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1429 } 1430 } 1431 #endif 1432 1433 // Returns threshold scaled with the value of scale. 1434 // If scale < 0.0, threshold is returned without scaling. 1435 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1436 if (scale == 1.0 || scale < 0.0) { 1437 return threshold; 1438 } else { 1439 return (intx)(threshold * scale); 1440 } 1441 } 1442 1443 // Returns freq_log scaled with the value of scale. 1444 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1445 // If scale < 0.0, freq_log is returned without scaling. 1446 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1447 // Check if scaling is necessary or if negative value was specified. 1448 if (scale == 1.0 || scale < 0.0) { 1449 return freq_log; 1450 } 1451 // Check values to avoid calculating log2 of 0. 1452 if (scale == 0.0 || freq_log == 0) { 1453 return 0; 1454 } 1455 // Determine the maximum notification frequency value currently supported. 1456 // The largest mask value that the interpreter/C1 can handle is 1457 // of length InvocationCounter::number_of_count_bits. Mask values are always 1458 // one bit shorter then the value of the notification frequency. Set 1459 // max_freq_bits accordingly. 1460 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1461 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1462 if (scaled_freq == 0) { 1463 // Return 0 right away to avoid calculating log2 of 0. 1464 return 0; 1465 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1466 return max_freq_bits; 1467 } else { 1468 return log2_intptr(scaled_freq); 1469 } 1470 } 1471 1472 void Arguments::set_tiered_flags() { 1473 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1474 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1475 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1476 } 1477 if (CompilationPolicyChoice < 2) { 1478 vm_exit_during_initialization( 1479 "Incompatible compilation policy selected", NULL); 1480 } 1481 // Increase the code cache size - tiered compiles a lot more. 1482 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1483 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1484 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1485 } 1486 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1487 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1488 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1489 } 1490 if (!UseInterpreter) { // -Xcomp 1491 Tier3InvokeNotifyFreqLog = 0; 1492 Tier4InvocationThreshold = 0; 1493 } 1494 1495 if (CompileThresholdScaling < 0) { 1496 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1497 } 1498 1499 // Scale tiered compilation thresholds. 1500 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1501 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1502 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1503 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1504 1505 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1506 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1507 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1508 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1509 1510 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1511 // once these thresholds become supported. 1512 1513 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1514 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1515 1516 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1517 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1518 1519 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1520 1521 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1522 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1523 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1524 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1525 } 1526 } 1527 1528 #if INCLUDE_ALL_GCS 1529 static void disable_adaptive_size_policy(const char* collector_name) { 1530 if (UseAdaptiveSizePolicy) { 1531 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1532 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1533 collector_name); 1534 } 1535 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1536 } 1537 } 1538 1539 void Arguments::set_parnew_gc_flags() { 1540 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1541 "control point invariant"); 1542 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1543 assert(UseParNewGC, "ParNew should always be used with CMS"); 1544 1545 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1546 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1547 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1548 } else if (ParallelGCThreads == 0) { 1549 jio_fprintf(defaultStream::error_stream(), 1550 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1551 vm_exit(1); 1552 } 1553 1554 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1555 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1556 // we set them to 1024 and 1024. 1557 // See CR 6362902. 1558 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1559 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1560 } 1561 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1562 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1563 } 1564 1565 // When using compressed oops, we use local overflow stacks, 1566 // rather than using a global overflow list chained through 1567 // the klass word of the object's pre-image. 1568 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1569 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1570 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1571 } 1572 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1573 } 1574 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1575 } 1576 1577 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1578 // sparc/solaris for certain applications, but would gain from 1579 // further optimization and tuning efforts, and would almost 1580 // certainly gain from analysis of platform and environment. 1581 void Arguments::set_cms_and_parnew_gc_flags() { 1582 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1583 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1584 assert(UseParNewGC, "ParNew should always be used with CMS"); 1585 1586 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1587 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1588 1589 set_parnew_gc_flags(); 1590 1591 size_t max_heap = align_size_down(MaxHeapSize, 1592 CardTableRS::ct_max_alignment_constraint()); 1593 1594 // Now make adjustments for CMS 1595 intx tenuring_default = (intx)6; 1596 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1597 1598 // Preferred young gen size for "short" pauses: 1599 // upper bound depends on # of threads and NewRatio. 1600 const size_t preferred_max_new_size_unaligned = 1601 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1602 size_t preferred_max_new_size = 1603 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1604 1605 // Unless explicitly requested otherwise, size young gen 1606 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1607 1608 // If either MaxNewSize or NewRatio is set on the command line, 1609 // assume the user is trying to set the size of the young gen. 1610 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1611 1612 // Set MaxNewSize to our calculated preferred_max_new_size unless 1613 // NewSize was set on the command line and it is larger than 1614 // preferred_max_new_size. 1615 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1616 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1617 } else { 1618 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1619 } 1620 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1621 1622 // Code along this path potentially sets NewSize and OldSize 1623 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1624 min_heap_size(), InitialHeapSize, max_heap); 1625 size_t min_new = preferred_max_new_size; 1626 if (FLAG_IS_CMDLINE(NewSize)) { 1627 min_new = NewSize; 1628 } 1629 if (max_heap > min_new && min_heap_size() > min_new) { 1630 // Unless explicitly requested otherwise, make young gen 1631 // at least min_new, and at most preferred_max_new_size. 1632 if (FLAG_IS_DEFAULT(NewSize)) { 1633 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1634 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1635 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1636 } 1637 // Unless explicitly requested otherwise, size old gen 1638 // so it's NewRatio x of NewSize. 1639 if (FLAG_IS_DEFAULT(OldSize)) { 1640 if (max_heap > NewSize) { 1641 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1642 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1643 } 1644 } 1645 } 1646 } 1647 // Unless explicitly requested otherwise, definitely 1648 // promote all objects surviving "tenuring_default" scavenges. 1649 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1650 FLAG_IS_DEFAULT(SurvivorRatio)) { 1651 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1652 } 1653 // If we decided above (or user explicitly requested) 1654 // `promote all' (via MaxTenuringThreshold := 0), 1655 // prefer minuscule survivor spaces so as not to waste 1656 // space for (non-existent) survivors 1657 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1658 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1659 } 1660 1661 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1662 // but rather the number of free blocks of a given size that are used when 1663 // replenishing the local per-worker free list caches. 1664 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1665 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1666 // OldPLAB sizing manually turned off: Use a larger default setting, 1667 // unless it was manually specified. This is because a too-low value 1668 // will slow down scavenges. 1669 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1670 } else { 1671 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1672 } 1673 } 1674 1675 // If either of the static initialization defaults have changed, note this 1676 // modification. 1677 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1678 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1679 } 1680 1681 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1682 } 1683 #endif // INCLUDE_ALL_GCS 1684 1685 void set_object_alignment() { 1686 // Object alignment. 1687 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1688 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1689 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1690 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1691 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1692 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1693 1694 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1695 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1696 1697 // Oop encoding heap max 1698 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1699 1700 if (SurvivorAlignmentInBytes == 0) { 1701 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1702 } 1703 1704 #if INCLUDE_ALL_GCS 1705 // Set CMS global values 1706 CompactibleFreeListSpace::set_cms_values(); 1707 #endif // INCLUDE_ALL_GCS 1708 } 1709 1710 size_t Arguments::max_heap_for_compressed_oops() { 1711 // Avoid sign flip. 1712 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1713 // We need to fit both the NULL page and the heap into the memory budget, while 1714 // keeping alignment constraints of the heap. To guarantee the latter, as the 1715 // NULL page is located before the heap, we pad the NULL page to the conservative 1716 // maximum alignment that the GC may ever impose upon the heap. 1717 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1718 _conservative_max_heap_alignment); 1719 1720 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1721 NOT_LP64(ShouldNotReachHere(); return 0); 1722 } 1723 1724 bool Arguments::should_auto_select_low_pause_collector() { 1725 if (UseAutoGCSelectPolicy && 1726 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1727 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1728 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1729 return true; 1730 } 1731 return false; 1732 } 1733 1734 void Arguments::set_use_compressed_oops() { 1735 #ifndef ZERO 1736 #ifdef _LP64 1737 // MaxHeapSize is not set up properly at this point, but 1738 // the only value that can override MaxHeapSize if we are 1739 // to use UseCompressedOops is InitialHeapSize. 1740 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1741 1742 if (max_heap_size <= max_heap_for_compressed_oops()) { 1743 #if !defined(COMPILER1) || defined(TIERED) 1744 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1745 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1746 } 1747 #endif 1748 } else { 1749 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1750 warning("Max heap size too large for Compressed Oops"); 1751 FLAG_SET_DEFAULT(UseCompressedOops, false); 1752 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1753 } 1754 } 1755 #endif // _LP64 1756 #endif // ZERO 1757 } 1758 1759 1760 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1761 // set_use_compressed_oops(). 1762 void Arguments::set_use_compressed_klass_ptrs() { 1763 #ifndef ZERO 1764 #ifdef _LP64 1765 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1766 if (!UseCompressedOops) { 1767 if (UseCompressedClassPointers) { 1768 warning("UseCompressedClassPointers requires UseCompressedOops"); 1769 } 1770 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1771 } else { 1772 // Turn on UseCompressedClassPointers too 1773 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1774 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1775 } 1776 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1777 if (UseCompressedClassPointers) { 1778 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1779 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1780 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1781 } 1782 } 1783 } 1784 #endif // _LP64 1785 #endif // !ZERO 1786 } 1787 1788 void Arguments::set_conservative_max_heap_alignment() { 1789 // The conservative maximum required alignment for the heap is the maximum of 1790 // the alignments imposed by several sources: any requirements from the heap 1791 // itself, the collector policy and the maximum page size we may run the VM 1792 // with. 1793 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1794 #if INCLUDE_ALL_GCS 1795 if (UseParallelGC) { 1796 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1797 } else if (UseG1GC) { 1798 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1799 } 1800 #endif // INCLUDE_ALL_GCS 1801 _conservative_max_heap_alignment = MAX4(heap_alignment, 1802 (size_t)os::vm_allocation_granularity(), 1803 os::max_page_size(), 1804 CollectorPolicy::compute_heap_alignment()); 1805 } 1806 1807 bool Arguments::gc_selected() { 1808 #if INCLUDE_ALL_GCS 1809 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1810 #else 1811 return UseSerialGC; 1812 #endif // INCLUDE_ALL_GCS 1813 } 1814 1815 void Arguments::select_gc_ergonomically() { 1816 #if INCLUDE_ALL_GCS 1817 if (os::is_server_class_machine()) { 1818 if (!UseAutoGCSelectPolicy) { 1819 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1820 } else { 1821 if (should_auto_select_low_pause_collector()) { 1822 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true); 1823 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true); 1824 } else { 1825 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true); 1826 } 1827 } 1828 } else { 1829 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1830 } 1831 #else 1832 UNSUPPORTED_OPTION(UseG1GC); 1833 UNSUPPORTED_OPTION(UseParallelGC); 1834 UNSUPPORTED_OPTION(UseParallelOldGC); 1835 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1836 UNSUPPORTED_OPTION(UseParNewGC); 1837 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1838 #endif // INCLUDE_ALL_GCS 1839 } 1840 1841 void Arguments::select_gc() { 1842 if (!gc_selected()) { 1843 select_gc_ergonomically(); 1844 if (!gc_selected()) { 1845 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1846 } 1847 } 1848 } 1849 1850 void Arguments::set_ergonomics_flags() { 1851 select_gc(); 1852 1853 #if defined(COMPILER2) || INCLUDE_JVMCI 1854 // Shared spaces work fine with other GCs but causes bytecode rewriting 1855 // to be disabled, which hurts interpreter performance and decreases 1856 // server performance. When -server is specified, keep the default off 1857 // unless it is asked for. Future work: either add bytecode rewriting 1858 // at link time, or rewrite bytecodes in non-shared methods. 1859 if (!DumpSharedSpaces && !RequireSharedSpaces && 1860 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1861 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1862 } 1863 #endif 1864 1865 set_conservative_max_heap_alignment(); 1866 1867 #ifndef ZERO 1868 #ifdef _LP64 1869 set_use_compressed_oops(); 1870 1871 // set_use_compressed_klass_ptrs() must be called after calling 1872 // set_use_compressed_oops(). 1873 set_use_compressed_klass_ptrs(); 1874 1875 // Also checks that certain machines are slower with compressed oops 1876 // in vm_version initialization code. 1877 #endif // _LP64 1878 #endif // !ZERO 1879 1880 CodeCacheExtensions::set_ergonomics_flags(); 1881 } 1882 1883 void Arguments::set_parallel_gc_flags() { 1884 assert(UseParallelGC || UseParallelOldGC, "Error"); 1885 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1886 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1887 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1888 } 1889 FLAG_SET_DEFAULT(UseParallelGC, true); 1890 1891 // If no heap maximum was requested explicitly, use some reasonable fraction 1892 // of the physical memory, up to a maximum of 1GB. 1893 FLAG_SET_DEFAULT(ParallelGCThreads, 1894 Abstract_VM_Version::parallel_worker_threads()); 1895 if (ParallelGCThreads == 0) { 1896 jio_fprintf(defaultStream::error_stream(), 1897 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1898 vm_exit(1); 1899 } 1900 1901 if (UseAdaptiveSizePolicy) { 1902 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1903 // unless the user actually sets these flags. 1904 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1905 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1906 } 1907 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1908 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1909 } 1910 } 1911 1912 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1913 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1914 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1915 // See CR 6362902 for details. 1916 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1917 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1918 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1919 } 1920 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1921 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1922 } 1923 } 1924 1925 if (UseParallelOldGC) { 1926 // Par compact uses lower default values since they are treated as 1927 // minimums. These are different defaults because of the different 1928 // interpretation and are not ergonomically set. 1929 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1930 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1931 } 1932 } 1933 } 1934 1935 void Arguments::set_g1_gc_flags() { 1936 assert(UseG1GC, "Error"); 1937 #if defined(COMPILER1) || INCLUDE_JVMCI 1938 FastTLABRefill = false; 1939 #endif 1940 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1941 if (ParallelGCThreads == 0) { 1942 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1943 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1944 } 1945 1946 #if INCLUDE_ALL_GCS 1947 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1948 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1949 } 1950 #endif 1951 1952 // MarkStackSize will be set (if it hasn't been set by the user) 1953 // when concurrent marking is initialized. 1954 // Its value will be based upon the number of parallel marking threads. 1955 // But we do set the maximum mark stack size here. 1956 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1957 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1958 } 1959 1960 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1961 // In G1, we want the default GC overhead goal to be higher than 1962 // it is for PS, or the heap might be expanded too aggressively. 1963 // We set it here to ~8%. 1964 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1965 } 1966 1967 // Below, we might need to calculate the pause time interval based on 1968 // the pause target. When we do so we are going to give G1 maximum 1969 // flexibility and allow it to do pauses when it needs to. So, we'll 1970 // arrange that the pause interval to be pause time target + 1 to 1971 // ensure that a) the pause time target is maximized with respect to 1972 // the pause interval and b) we maintain the invariant that pause 1973 // time target < pause interval. If the user does not want this 1974 // maximum flexibility, they will have to set the pause interval 1975 // explicitly. 1976 1977 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1978 // The default pause time target in G1 is 200ms 1979 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1980 } 1981 1982 // Then, if the interval parameter was not set, set it according to 1983 // the pause time target (this will also deal with the case when the 1984 // pause time target is the default value). 1985 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1986 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1987 } 1988 1989 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1990 } 1991 1992 void Arguments::set_gc_specific_flags() { 1993 #if INCLUDE_ALL_GCS 1994 // Set per-collector flags 1995 if (UseParallelGC || UseParallelOldGC) { 1996 set_parallel_gc_flags(); 1997 } else if (UseConcMarkSweepGC) { 1998 set_cms_and_parnew_gc_flags(); 1999 } else if (UseG1GC) { 2000 set_g1_gc_flags(); 2001 } 2002 if (AssumeMP && !UseSerialGC) { 2003 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2004 warning("If the number of processors is expected to increase from one, then" 2005 " you should configure the number of parallel GC threads appropriately" 2006 " using -XX:ParallelGCThreads=N"); 2007 } 2008 } 2009 if (MinHeapFreeRatio == 100) { 2010 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2011 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2012 } 2013 2014 // If class unloading is disabled, also disable concurrent class unloading. 2015 if (!ClassUnloading) { 2016 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2017 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2018 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 2019 } 2020 #endif // INCLUDE_ALL_GCS 2021 } 2022 2023 julong Arguments::limit_by_allocatable_memory(julong limit) { 2024 julong max_allocatable; 2025 julong result = limit; 2026 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2027 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2028 } 2029 return result; 2030 } 2031 2032 // Use static initialization to get the default before parsing 2033 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2034 2035 void Arguments::set_heap_size() { 2036 const julong phys_mem = 2037 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2038 : (julong)MaxRAM; 2039 2040 // If the maximum heap size has not been set with -Xmx, 2041 // then set it as fraction of the size of physical memory, 2042 // respecting the maximum and minimum sizes of the heap. 2043 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2044 julong reasonable_max = phys_mem / MaxRAMFraction; 2045 2046 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2047 // Small physical memory, so use a minimum fraction of it for the heap 2048 reasonable_max = phys_mem / MinRAMFraction; 2049 } else { 2050 // Not-small physical memory, so require a heap at least 2051 // as large as MaxHeapSize 2052 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2053 } 2054 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2055 // Limit the heap size to ErgoHeapSizeLimit 2056 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2057 } 2058 if (UseCompressedOops) { 2059 // Limit the heap size to the maximum possible when using compressed oops 2060 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2061 2062 // HeapBaseMinAddress can be greater than default but not less than. 2063 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2064 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2065 // matches compressed oops printing flags 2066 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2067 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2068 DefaultHeapBaseMinAddress, 2069 DefaultHeapBaseMinAddress/G, 2070 HeapBaseMinAddress); 2071 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2072 } 2073 } 2074 2075 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2076 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2077 // but it should be not less than default MaxHeapSize. 2078 max_coop_heap -= HeapBaseMinAddress; 2079 } 2080 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2081 } 2082 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2083 2084 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2085 // An initial heap size was specified on the command line, 2086 // so be sure that the maximum size is consistent. Done 2087 // after call to limit_by_allocatable_memory because that 2088 // method might reduce the allocation size. 2089 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2090 } 2091 2092 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2093 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2094 } 2095 2096 // If the minimum or initial heap_size have not been set or requested to be set 2097 // ergonomically, set them accordingly. 2098 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2099 julong reasonable_minimum = (julong)(OldSize + NewSize); 2100 2101 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2102 2103 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2104 2105 if (InitialHeapSize == 0) { 2106 julong reasonable_initial = phys_mem / InitialRAMFraction; 2107 2108 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2109 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2110 2111 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2112 2113 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2114 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2115 } 2116 // If the minimum heap size has not been set (via -Xms), 2117 // synchronize with InitialHeapSize to avoid errors with the default value. 2118 if (min_heap_size() == 0) { 2119 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2120 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2121 } 2122 } 2123 } 2124 2125 // This option inspects the machine and attempts to set various 2126 // parameters to be optimal for long-running, memory allocation 2127 // intensive jobs. It is intended for machines with large 2128 // amounts of cpu and memory. 2129 jint Arguments::set_aggressive_heap_flags() { 2130 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2131 // VM, but we may not be able to represent the total physical memory 2132 // available (like having 8gb of memory on a box but using a 32bit VM). 2133 // Thus, we need to make sure we're using a julong for intermediate 2134 // calculations. 2135 julong initHeapSize; 2136 julong total_memory = os::physical_memory(); 2137 2138 if (total_memory < (julong) 256 * M) { 2139 jio_fprintf(defaultStream::error_stream(), 2140 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2141 vm_exit(1); 2142 } 2143 2144 // The heap size is half of available memory, or (at most) 2145 // all of possible memory less 160mb (leaving room for the OS 2146 // when using ISM). This is the maximum; because adaptive sizing 2147 // is turned on below, the actual space used may be smaller. 2148 2149 initHeapSize = MIN2(total_memory / (julong) 2, 2150 total_memory - (julong) 160 * M); 2151 2152 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2153 2154 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2155 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2156 return JNI_EINVAL; 2157 } 2158 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2159 return JNI_EINVAL; 2160 } 2161 // Currently the minimum size and the initial heap sizes are the same. 2162 set_min_heap_size(initHeapSize); 2163 } 2164 if (FLAG_IS_DEFAULT(NewSize)) { 2165 // Make the young generation 3/8ths of the total heap. 2166 if (FLAG_SET_CMDLINE(size_t, NewSize, 2167 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2168 return JNI_EINVAL; 2169 } 2170 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2171 return JNI_EINVAL; 2172 } 2173 } 2174 2175 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2176 FLAG_SET_DEFAULT(UseLargePages, true); 2177 #endif 2178 2179 // Increase some data structure sizes for efficiency 2180 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2181 return JNI_EINVAL; 2182 } 2183 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2184 return JNI_EINVAL; 2185 } 2186 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2187 return JNI_EINVAL; 2188 } 2189 2190 // See the OldPLABSize comment below, but replace 'after promotion' 2191 // with 'after copying'. YoungPLABSize is the size of the survivor 2192 // space per-gc-thread buffers. The default is 4kw. 2193 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2194 return JNI_EINVAL; 2195 } 2196 2197 // OldPLABSize is the size of the buffers in the old gen that 2198 // UseParallelGC uses to promote live data that doesn't fit in the 2199 // survivor spaces. At any given time, there's one for each gc thread. 2200 // The default size is 1kw. These buffers are rarely used, since the 2201 // survivor spaces are usually big enough. For specjbb, however, there 2202 // are occasions when there's lots of live data in the young gen 2203 // and we end up promoting some of it. We don't have a definite 2204 // explanation for why bumping OldPLABSize helps, but the theory 2205 // is that a bigger PLAB results in retaining something like the 2206 // original allocation order after promotion, which improves mutator 2207 // locality. A minor effect may be that larger PLABs reduce the 2208 // number of PLAB allocation events during gc. The value of 8kw 2209 // was arrived at by experimenting with specjbb. 2210 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2211 return JNI_EINVAL; 2212 } 2213 2214 // Enable parallel GC and adaptive generation sizing 2215 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2216 return JNI_EINVAL; 2217 } 2218 FLAG_SET_DEFAULT(ParallelGCThreads, 2219 Abstract_VM_Version::parallel_worker_threads()); 2220 2221 // Encourage steady state memory management 2222 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2223 return JNI_EINVAL; 2224 } 2225 2226 // This appears to improve mutator locality 2227 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2228 return JNI_EINVAL; 2229 } 2230 2231 // Get around early Solaris scheduling bug 2232 // (affinity vs other jobs on system) 2233 // but disallow DR and offlining (5008695). 2234 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2235 return JNI_EINVAL; 2236 } 2237 2238 return JNI_OK; 2239 } 2240 2241 // This must be called after ergonomics. 2242 void Arguments::set_bytecode_flags() { 2243 if (!RewriteBytecodes) { 2244 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2245 } 2246 } 2247 2248 // Aggressive optimization flags -XX:+AggressiveOpts 2249 jint Arguments::set_aggressive_opts_flags() { 2250 #ifdef COMPILER2 2251 if (AggressiveUnboxing) { 2252 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2253 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2254 } else if (!EliminateAutoBox) { 2255 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2256 AggressiveUnboxing = false; 2257 } 2258 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2259 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2260 } else if (!DoEscapeAnalysis) { 2261 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2262 AggressiveUnboxing = false; 2263 } 2264 } 2265 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2266 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2267 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2268 } 2269 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2270 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2271 } 2272 2273 // Feed the cache size setting into the JDK 2274 char buffer[1024]; 2275 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2276 if (!add_property(buffer)) { 2277 return JNI_ENOMEM; 2278 } 2279 } 2280 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2281 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2282 } 2283 #endif 2284 2285 if (AggressiveOpts) { 2286 // Sample flag setting code 2287 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2288 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2289 // } 2290 } 2291 2292 return JNI_OK; 2293 } 2294 2295 //=========================================================================================================== 2296 // Parsing of java.compiler property 2297 2298 void Arguments::process_java_compiler_argument(const char* arg) { 2299 // For backwards compatibility, Djava.compiler=NONE or "" 2300 // causes us to switch to -Xint mode UNLESS -Xdebug 2301 // is also specified. 2302 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2303 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2304 } 2305 } 2306 2307 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2308 _sun_java_launcher = os::strdup_check_oom(launcher); 2309 } 2310 2311 bool Arguments::created_by_java_launcher() { 2312 assert(_sun_java_launcher != NULL, "property must have value"); 2313 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2314 } 2315 2316 bool Arguments::sun_java_launcher_is_altjvm() { 2317 return _sun_java_launcher_is_altjvm; 2318 } 2319 2320 //=========================================================================================================== 2321 // Parsing of main arguments 2322 2323 #if INCLUDE_JVMCI 2324 // Check consistency of jvmci vm argument settings. 2325 bool Arguments::check_jvmci_args_consistency() { 2326 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2327 } 2328 #endif //INCLUDE_JVMCI 2329 2330 // Check consistency of GC selection 2331 bool Arguments::check_gc_consistency() { 2332 // Ensure that the user has not selected conflicting sets 2333 // of collectors. 2334 uint i = 0; 2335 if (UseSerialGC) i++; 2336 if (UseConcMarkSweepGC) i++; 2337 if (UseParallelGC || UseParallelOldGC) i++; 2338 if (UseG1GC) i++; 2339 if (i > 1) { 2340 jio_fprintf(defaultStream::error_stream(), 2341 "Conflicting collector combinations in option list; " 2342 "please refer to the release notes for the combinations " 2343 "allowed\n"); 2344 return false; 2345 } 2346 2347 if (UseConcMarkSweepGC && !UseParNewGC) { 2348 jio_fprintf(defaultStream::error_stream(), 2349 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2350 return false; 2351 } 2352 2353 if (UseParNewGC && !UseConcMarkSweepGC) { 2354 jio_fprintf(defaultStream::error_stream(), 2355 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2356 return false; 2357 } 2358 2359 return true; 2360 } 2361 2362 // Check the consistency of vm_init_args 2363 bool Arguments::check_vm_args_consistency() { 2364 // Method for adding checks for flag consistency. 2365 // The intent is to warn the user of all possible conflicts, 2366 // before returning an error. 2367 // Note: Needs platform-dependent factoring. 2368 bool status = true; 2369 2370 if (TLABRefillWasteFraction == 0) { 2371 jio_fprintf(defaultStream::error_stream(), 2372 "TLABRefillWasteFraction should be a denominator, " 2373 "not " SIZE_FORMAT "\n", 2374 TLABRefillWasteFraction); 2375 status = false; 2376 } 2377 2378 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2379 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2380 } 2381 2382 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2383 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2384 } 2385 2386 if (GCTimeLimit == 100) { 2387 // Turn off gc-overhead-limit-exceeded checks 2388 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2389 } 2390 2391 status = status && check_gc_consistency(); 2392 2393 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2394 // insists that we hold the requisite locks so that the iteration is 2395 // MT-safe. For the verification at start-up and shut-down, we don't 2396 // yet have a good way of acquiring and releasing these locks, 2397 // which are not visible at the CollectedHeap level. We want to 2398 // be able to acquire these locks and then do the iteration rather 2399 // than just disable the lock verification. This will be fixed under 2400 // bug 4788986. 2401 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2402 if (VerifyDuringStartup) { 2403 warning("Heap verification at start-up disabled " 2404 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2405 VerifyDuringStartup = false; // Disable verification at start-up 2406 } 2407 2408 if (VerifyBeforeExit) { 2409 warning("Heap verification at shutdown disabled " 2410 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2411 VerifyBeforeExit = false; // Disable verification at shutdown 2412 } 2413 } 2414 2415 if (PrintNMTStatistics) { 2416 #if INCLUDE_NMT 2417 if (MemTracker::tracking_level() == NMT_off) { 2418 #endif // INCLUDE_NMT 2419 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2420 PrintNMTStatistics = false; 2421 #if INCLUDE_NMT 2422 } 2423 #endif 2424 } 2425 #if INCLUDE_JVMCI 2426 2427 status = status && check_jvmci_args_consistency(); 2428 2429 if (EnableJVMCI) { 2430 if (!ScavengeRootsInCode) { 2431 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2432 ScavengeRootsInCode = 1; 2433 } 2434 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2435 TypeProfileLevel = 0; 2436 } 2437 if (UseJVMCICompiler) { 2438 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2439 TypeProfileWidth = 8; 2440 } 2441 } 2442 } 2443 #endif 2444 2445 // Check lower bounds of the code cache 2446 // Template Interpreter code is approximately 3X larger in debug builds. 2447 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2448 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2449 jio_fprintf(defaultStream::error_stream(), 2450 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2451 os::vm_page_size()/K); 2452 status = false; 2453 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2454 jio_fprintf(defaultStream::error_stream(), 2455 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2456 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2457 status = false; 2458 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2459 jio_fprintf(defaultStream::error_stream(), 2460 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2461 min_code_cache_size/K); 2462 status = false; 2463 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2464 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2465 jio_fprintf(defaultStream::error_stream(), 2466 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2467 CODE_CACHE_SIZE_LIMIT/M); 2468 status = false; 2469 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2470 jio_fprintf(defaultStream::error_stream(), 2471 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2472 min_code_cache_size/K); 2473 status = false; 2474 } 2475 2476 #ifdef _LP64 2477 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2478 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2479 } 2480 #endif 2481 2482 #ifndef SUPPORT_RESERVED_STACK_AREA 2483 if (StackReservedPages != 0) { 2484 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2485 warning("Reserved Stack Area not supported on this platform"); 2486 } 2487 #endif 2488 2489 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2490 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2491 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2492 } 2493 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2494 } 2495 if (UseCompiler && is_interpreter_only()) { 2496 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2497 warning("UseCompiler disabled due to -Xint."); 2498 } 2499 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2500 } 2501 #ifdef COMPILER2 2502 if (PostLoopMultiversioning && !RangeCheckElimination) { 2503 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2504 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2505 } 2506 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2507 } 2508 #endif 2509 return status; 2510 } 2511 2512 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2513 const char* option_type) { 2514 if (ignore) return false; 2515 2516 const char* spacer = " "; 2517 if (option_type == NULL) { 2518 option_type = ++spacer; // Set both to the empty string. 2519 } 2520 2521 if (os::obsolete_option(option)) { 2522 jio_fprintf(defaultStream::error_stream(), 2523 "Obsolete %s%soption: %s\n", option_type, spacer, 2524 option->optionString); 2525 return false; 2526 } else { 2527 jio_fprintf(defaultStream::error_stream(), 2528 "Unrecognized %s%soption: %s\n", option_type, spacer, 2529 option->optionString); 2530 return true; 2531 } 2532 } 2533 2534 static const char* user_assertion_options[] = { 2535 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2536 }; 2537 2538 static const char* system_assertion_options[] = { 2539 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2540 }; 2541 2542 bool Arguments::parse_uintx(const char* value, 2543 uintx* uintx_arg, 2544 uintx min_size) { 2545 2546 // Check the sign first since atojulong() parses only unsigned values. 2547 bool value_is_positive = !(*value == '-'); 2548 2549 if (value_is_positive) { 2550 julong n; 2551 bool good_return = atojulong(value, &n); 2552 if (good_return) { 2553 bool above_minimum = n >= min_size; 2554 bool value_is_too_large = n > max_uintx; 2555 2556 if (above_minimum && !value_is_too_large) { 2557 *uintx_arg = n; 2558 return true; 2559 } 2560 } 2561 } 2562 return false; 2563 } 2564 2565 unsigned int addreads_count = 0; 2566 unsigned int addexports_count = 0; 2567 unsigned int addmods_count = 0; 2568 unsigned int patch_mod_count = 0; 2569 2570 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2571 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2572 char* property = AllocateHeap(prop_len, mtArguments); 2573 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2574 if (ret < 0 || ret >= (int)prop_len) { 2575 FreeHeap(property); 2576 return false; 2577 } 2578 bool added = add_property(property, UnwriteableProperty, internal); 2579 FreeHeap(property); 2580 return added; 2581 } 2582 2583 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2584 // Make sure count is < 1,000. Otherwise, memory allocation will be too small. 2585 if (count < 1000) { 2586 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5; 2587 char* property = AllocateHeap(prop_len, mtArguments); 2588 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2589 if (ret < 0 || ret >= (int)prop_len) { 2590 FreeHeap(property); 2591 return false; 2592 } 2593 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2594 FreeHeap(property); 2595 return added; 2596 } 2597 return false; 2598 } 2599 2600 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2601 julong* long_arg, 2602 julong min_size) { 2603 if (!atojulong(s, long_arg)) return arg_unreadable; 2604 return check_memory_size(*long_arg, min_size); 2605 } 2606 2607 // Parse JavaVMInitArgs structure 2608 2609 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2610 const JavaVMInitArgs *java_options_args, 2611 const JavaVMInitArgs *cmd_line_args) { 2612 bool patch_mod_javabase = false; 2613 2614 // Save default settings for some mode flags 2615 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2616 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2617 Arguments::_ClipInlining = ClipInlining; 2618 Arguments::_BackgroundCompilation = BackgroundCompilation; 2619 if (TieredCompilation) { 2620 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2621 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2622 } 2623 2624 // Setup flags for mixed which is the default 2625 set_mode_flags(_mixed); 2626 2627 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2628 // variable (if present). 2629 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2630 if (result != JNI_OK) { 2631 return result; 2632 } 2633 2634 // Parse args structure generated from the command line flags. 2635 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2636 if (result != JNI_OK) { 2637 return result; 2638 } 2639 2640 // Parse args structure generated from the _JAVA_OPTIONS environment 2641 // variable (if present) (mimics classic VM) 2642 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2643 if (result != JNI_OK) { 2644 return result; 2645 } 2646 2647 // Do final processing now that all arguments have been parsed 2648 result = finalize_vm_init_args(); 2649 if (result != JNI_OK) { 2650 return result; 2651 } 2652 2653 return JNI_OK; 2654 } 2655 2656 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2657 // represents a valid JDWP agent. is_path==true denotes that we 2658 // are dealing with -agentpath (case where name is a path), otherwise with 2659 // -agentlib 2660 bool valid_jdwp_agent(char *name, bool is_path) { 2661 char *_name; 2662 const char *_jdwp = "jdwp"; 2663 size_t _len_jdwp, _len_prefix; 2664 2665 if (is_path) { 2666 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2667 return false; 2668 } 2669 2670 _name++; // skip past last path separator 2671 _len_prefix = strlen(JNI_LIB_PREFIX); 2672 2673 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2674 return false; 2675 } 2676 2677 _name += _len_prefix; 2678 _len_jdwp = strlen(_jdwp); 2679 2680 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2681 _name += _len_jdwp; 2682 } 2683 else { 2684 return false; 2685 } 2686 2687 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2688 return false; 2689 } 2690 2691 return true; 2692 } 2693 2694 if (strcmp(name, _jdwp) == 0) { 2695 return true; 2696 } 2697 2698 return false; 2699 } 2700 2701 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2702 // --patch-module=<module>=<file>(<pathsep><file>)* 2703 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2704 // Find the equal sign between the module name and the path specification 2705 const char* module_equal = strchr(patch_mod_tail, '='); 2706 if (module_equal == NULL) { 2707 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2708 return JNI_ERR; 2709 } else { 2710 // Pick out the module name 2711 size_t module_len = module_equal - patch_mod_tail; 2712 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2713 if (module_name != NULL) { 2714 memcpy(module_name, patch_mod_tail, module_len); 2715 *(module_name + module_len) = '\0'; 2716 // The path piece begins one past the module_equal sign 2717 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2718 FREE_C_HEAP_ARRAY(char, module_name); 2719 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2720 return JNI_ENOMEM; 2721 } 2722 } else { 2723 return JNI_ENOMEM; 2724 } 2725 } 2726 return JNI_OK; 2727 } 2728 2729 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2730 // For match_option to return remaining or value part of option string 2731 const char* tail; 2732 2733 // iterate over arguments 2734 for (int index = 0; index < args->nOptions; index++) { 2735 bool is_absolute_path = false; // for -agentpath vs -agentlib 2736 2737 const JavaVMOption* option = args->options + index; 2738 2739 if (!match_option(option, "-Djava.class.path", &tail) && 2740 !match_option(option, "-Dsun.java.command", &tail) && 2741 !match_option(option, "-Dsun.java.launcher", &tail)) { 2742 2743 // add all jvm options to the jvm_args string. This string 2744 // is used later to set the java.vm.args PerfData string constant. 2745 // the -Djava.class.path and the -Dsun.java.command options are 2746 // omitted from jvm_args string as each have their own PerfData 2747 // string constant object. 2748 build_jvm_args(option->optionString); 2749 } 2750 2751 // -verbose:[class/gc/jni] 2752 if (match_option(option, "-verbose", &tail)) { 2753 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2754 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2755 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2756 } else if (!strcmp(tail, ":gc")) { 2757 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2758 } else if (!strcmp(tail, ":jni")) { 2759 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2760 return JNI_EINVAL; 2761 } 2762 } 2763 // -da / -ea / -disableassertions / -enableassertions 2764 // These accept an optional class/package name separated by a colon, e.g., 2765 // -da:java.lang.Thread. 2766 } else if (match_option(option, user_assertion_options, &tail, true)) { 2767 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2768 if (*tail == '\0') { 2769 JavaAssertions::setUserClassDefault(enable); 2770 } else { 2771 assert(*tail == ':', "bogus match by match_option()"); 2772 JavaAssertions::addOption(tail + 1, enable); 2773 } 2774 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2775 } else if (match_option(option, system_assertion_options, &tail, false)) { 2776 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2777 JavaAssertions::setSystemClassDefault(enable); 2778 // -bootclasspath: 2779 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2780 jio_fprintf(defaultStream::output_stream(), 2781 "-Xbootclasspath is no longer a supported option.\n"); 2782 return JNI_EINVAL; 2783 // -bootclasspath/a: 2784 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2785 Arguments::append_sysclasspath(tail); 2786 // -bootclasspath/p: 2787 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2788 jio_fprintf(defaultStream::output_stream(), 2789 "-Xbootclasspath/p is no longer a supported option.\n"); 2790 return JNI_EINVAL; 2791 // -Xrun 2792 } else if (match_option(option, "-Xrun", &tail)) { 2793 if (tail != NULL) { 2794 const char* pos = strchr(tail, ':'); 2795 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2796 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2797 jio_snprintf(name, len + 1, "%s", tail); 2798 2799 char *options = NULL; 2800 if(pos != NULL) { 2801 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2802 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2803 } 2804 #if !INCLUDE_JVMTI 2805 if (strcmp(name, "jdwp") == 0) { 2806 jio_fprintf(defaultStream::error_stream(), 2807 "Debugging agents are not supported in this VM\n"); 2808 return JNI_ERR; 2809 } 2810 #endif // !INCLUDE_JVMTI 2811 add_init_library(name, options); 2812 } 2813 } else if (match_option(option, "--add-reads=", &tail)) { 2814 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2815 return JNI_ENOMEM; 2816 } 2817 } else if (match_option(option, "--add-exports=", &tail)) { 2818 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2819 return JNI_ENOMEM; 2820 } 2821 } else if (match_option(option, "--add-modules=", &tail)) { 2822 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2823 return JNI_ENOMEM; 2824 } 2825 } else if (match_option(option, "--limit-modules=", &tail)) { 2826 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2827 return JNI_ENOMEM; 2828 } 2829 } else if (match_option(option, "--module-path=", &tail)) { 2830 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2831 return JNI_ENOMEM; 2832 } 2833 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2834 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2835 return JNI_ENOMEM; 2836 } 2837 } else if (match_option(option, "--patch-module=", &tail)) { 2838 // --patch-module=<module>=<file>(<pathsep><file>)* 2839 int res = process_patch_mod_option(tail, patch_mod_javabase); 2840 if (res != JNI_OK) { 2841 return res; 2842 } 2843 // -agentlib and -agentpath 2844 } else if (match_option(option, "-agentlib:", &tail) || 2845 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2846 if(tail != NULL) { 2847 const char* pos = strchr(tail, '='); 2848 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2849 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2850 name[len] = '\0'; 2851 2852 char *options = NULL; 2853 if(pos != NULL) { 2854 options = os::strdup_check_oom(pos + 1, mtArguments); 2855 } 2856 #if !INCLUDE_JVMTI 2857 if (valid_jdwp_agent(name, is_absolute_path)) { 2858 jio_fprintf(defaultStream::error_stream(), 2859 "Debugging agents are not supported in this VM\n"); 2860 return JNI_ERR; 2861 } 2862 #endif // !INCLUDE_JVMTI 2863 add_init_agent(name, options, is_absolute_path); 2864 } 2865 // -javaagent 2866 } else if (match_option(option, "-javaagent:", &tail)) { 2867 #if !INCLUDE_JVMTI 2868 jio_fprintf(defaultStream::error_stream(), 2869 "Instrumentation agents are not supported in this VM\n"); 2870 return JNI_ERR; 2871 #else 2872 if (tail != NULL) { 2873 size_t length = strlen(tail) + 1; 2874 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2875 jio_snprintf(options, length, "%s", tail); 2876 add_init_agent("instrument", options, false); 2877 // java agents need module java.instrument 2878 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2879 return JNI_ENOMEM; 2880 } 2881 } 2882 #endif // !INCLUDE_JVMTI 2883 // -Xnoclassgc 2884 } else if (match_option(option, "-Xnoclassgc")) { 2885 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2886 return JNI_EINVAL; 2887 } 2888 // -Xconcgc 2889 } else if (match_option(option, "-Xconcgc")) { 2890 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2891 return JNI_EINVAL; 2892 } 2893 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2894 // -Xnoconcgc 2895 } else if (match_option(option, "-Xnoconcgc")) { 2896 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2897 return JNI_EINVAL; 2898 } 2899 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2900 // -Xbatch 2901 } else if (match_option(option, "-Xbatch")) { 2902 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2903 return JNI_EINVAL; 2904 } 2905 // -Xmn for compatibility with other JVM vendors 2906 } else if (match_option(option, "-Xmn", &tail)) { 2907 julong long_initial_young_size = 0; 2908 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2909 if (errcode != arg_in_range) { 2910 jio_fprintf(defaultStream::error_stream(), 2911 "Invalid initial young generation size: %s\n", option->optionString); 2912 describe_range_error(errcode); 2913 return JNI_EINVAL; 2914 } 2915 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2916 return JNI_EINVAL; 2917 } 2918 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2919 return JNI_EINVAL; 2920 } 2921 // -Xms 2922 } else if (match_option(option, "-Xms", &tail)) { 2923 julong long_initial_heap_size = 0; 2924 // an initial heap size of 0 means automatically determine 2925 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2926 if (errcode != arg_in_range) { 2927 jio_fprintf(defaultStream::error_stream(), 2928 "Invalid initial heap size: %s\n", option->optionString); 2929 describe_range_error(errcode); 2930 return JNI_EINVAL; 2931 } 2932 set_min_heap_size((size_t)long_initial_heap_size); 2933 // Currently the minimum size and the initial heap sizes are the same. 2934 // Can be overridden with -XX:InitialHeapSize. 2935 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2936 return JNI_EINVAL; 2937 } 2938 // -Xmx 2939 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2940 julong long_max_heap_size = 0; 2941 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2942 if (errcode != arg_in_range) { 2943 jio_fprintf(defaultStream::error_stream(), 2944 "Invalid maximum heap size: %s\n", option->optionString); 2945 describe_range_error(errcode); 2946 return JNI_EINVAL; 2947 } 2948 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2949 return JNI_EINVAL; 2950 } 2951 // Xmaxf 2952 } else if (match_option(option, "-Xmaxf", &tail)) { 2953 char* err; 2954 int maxf = (int)(strtod(tail, &err) * 100); 2955 if (*err != '\0' || *tail == '\0') { 2956 jio_fprintf(defaultStream::error_stream(), 2957 "Bad max heap free percentage size: %s\n", 2958 option->optionString); 2959 return JNI_EINVAL; 2960 } else { 2961 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2962 return JNI_EINVAL; 2963 } 2964 } 2965 // Xminf 2966 } else if (match_option(option, "-Xminf", &tail)) { 2967 char* err; 2968 int minf = (int)(strtod(tail, &err) * 100); 2969 if (*err != '\0' || *tail == '\0') { 2970 jio_fprintf(defaultStream::error_stream(), 2971 "Bad min heap free percentage size: %s\n", 2972 option->optionString); 2973 return JNI_EINVAL; 2974 } else { 2975 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2976 return JNI_EINVAL; 2977 } 2978 } 2979 // -Xss 2980 } else if (match_option(option, "-Xss", &tail)) { 2981 julong long_ThreadStackSize = 0; 2982 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2983 if (errcode != arg_in_range) { 2984 jio_fprintf(defaultStream::error_stream(), 2985 "Invalid thread stack size: %s\n", option->optionString); 2986 describe_range_error(errcode); 2987 return JNI_EINVAL; 2988 } 2989 // Internally track ThreadStackSize in units of 1024 bytes. 2990 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2991 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 2995 } else if (match_option(option, "-Xoss", &tail) || 2996 match_option(option, "-Xsqnopause") || 2997 match_option(option, "-Xoptimize") || 2998 match_option(option, "-Xboundthreads") || 2999 match_option(option, "-Xusealtsigs")) { 3000 // All these options are deprecated in JDK 9 and will be removed in a future release 3001 char version[256]; 3002 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3003 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3004 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3005 julong long_CodeCacheExpansionSize = 0; 3006 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3007 if (errcode != arg_in_range) { 3008 jio_fprintf(defaultStream::error_stream(), 3009 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3010 os::vm_page_size()/K); 3011 return JNI_EINVAL; 3012 } 3013 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3014 return JNI_EINVAL; 3015 } 3016 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3017 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3018 julong long_ReservedCodeCacheSize = 0; 3019 3020 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3021 if (errcode != arg_in_range) { 3022 jio_fprintf(defaultStream::error_stream(), 3023 "Invalid maximum code cache size: %s.\n", option->optionString); 3024 return JNI_EINVAL; 3025 } 3026 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3027 return JNI_EINVAL; 3028 } 3029 // -XX:NonNMethodCodeHeapSize= 3030 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3031 julong long_NonNMethodCodeHeapSize = 0; 3032 3033 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3034 if (errcode != arg_in_range) { 3035 jio_fprintf(defaultStream::error_stream(), 3036 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3037 return JNI_EINVAL; 3038 } 3039 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3040 return JNI_EINVAL; 3041 } 3042 // -XX:ProfiledCodeHeapSize= 3043 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3044 julong long_ProfiledCodeHeapSize = 0; 3045 3046 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3047 if (errcode != arg_in_range) { 3048 jio_fprintf(defaultStream::error_stream(), 3049 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3050 return JNI_EINVAL; 3051 } 3052 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3053 return JNI_EINVAL; 3054 } 3055 // -XX:NonProfiledCodeHeapSizee= 3056 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3057 julong long_NonProfiledCodeHeapSize = 0; 3058 3059 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3060 if (errcode != arg_in_range) { 3061 jio_fprintf(defaultStream::error_stream(), 3062 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3063 return JNI_EINVAL; 3064 } 3065 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3066 return JNI_EINVAL; 3067 } 3068 // -green 3069 } else if (match_option(option, "-green")) { 3070 jio_fprintf(defaultStream::error_stream(), 3071 "Green threads support not available\n"); 3072 return JNI_EINVAL; 3073 // -native 3074 } else if (match_option(option, "-native")) { 3075 // HotSpot always uses native threads, ignore silently for compatibility 3076 // -Xrs 3077 } else if (match_option(option, "-Xrs")) { 3078 // Classic/EVM option, new functionality 3079 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3080 return JNI_EINVAL; 3081 } 3082 // -Xprof 3083 } else if (match_option(option, "-Xprof")) { 3084 #if INCLUDE_FPROF 3085 _has_profile = true; 3086 #else // INCLUDE_FPROF 3087 jio_fprintf(defaultStream::error_stream(), 3088 "Flat profiling is not supported in this VM.\n"); 3089 return JNI_ERR; 3090 #endif // INCLUDE_FPROF 3091 // -Xconcurrentio 3092 } else if (match_option(option, "-Xconcurrentio")) { 3093 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3094 return JNI_EINVAL; 3095 } 3096 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3097 return JNI_EINVAL; 3098 } 3099 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3100 return JNI_EINVAL; 3101 } 3102 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3103 return JNI_EINVAL; 3104 } 3105 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3106 return JNI_EINVAL; 3107 } 3108 3109 // -Xinternalversion 3110 } else if (match_option(option, "-Xinternalversion")) { 3111 jio_fprintf(defaultStream::output_stream(), "%s\n", 3112 VM_Version::internal_vm_info_string()); 3113 vm_exit(0); 3114 #ifndef PRODUCT 3115 // -Xprintflags 3116 } else if (match_option(option, "-Xprintflags")) { 3117 CommandLineFlags::printFlags(tty, false); 3118 vm_exit(0); 3119 #endif 3120 // -D 3121 } else if (match_option(option, "-D", &tail)) { 3122 const char* value; 3123 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3124 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3125 // abort if -Djava.endorsed.dirs is set 3126 jio_fprintf(defaultStream::output_stream(), 3127 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3128 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3129 return JNI_EINVAL; 3130 } 3131 if (match_option(option, "-Djava.ext.dirs=", &value) && 3132 *value != '\0' && strcmp(value, "\"\"") != 0) { 3133 // abort if -Djava.ext.dirs is set 3134 jio_fprintf(defaultStream::output_stream(), 3135 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3136 return JNI_EINVAL; 3137 } 3138 // Check for module related properties. They must be set using the modules 3139 // options. For example: use "--add-modules=java.sql", not 3140 // "-Djdk.module.addmods=java.sql" 3141 if (is_internal_module_property(option->optionString + 2)) { 3142 needs_module_property_warning = true; 3143 continue; 3144 } 3145 3146 if (!add_property(tail)) { 3147 return JNI_ENOMEM; 3148 } 3149 // Out of the box management support 3150 if (match_option(option, "-Dcom.sun.management", &tail)) { 3151 #if INCLUDE_MANAGEMENT 3152 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3153 return JNI_EINVAL; 3154 } 3155 // management agent in module java.management 3156 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) { 3157 return JNI_ENOMEM; 3158 } 3159 #else 3160 jio_fprintf(defaultStream::output_stream(), 3161 "-Dcom.sun.management is not supported in this VM.\n"); 3162 return JNI_ERR; 3163 #endif 3164 } 3165 // -Xint 3166 } else if (match_option(option, "-Xint")) { 3167 set_mode_flags(_int); 3168 // -Xmixed 3169 } else if (match_option(option, "-Xmixed")) { 3170 set_mode_flags(_mixed); 3171 // -Xcomp 3172 } else if (match_option(option, "-Xcomp")) { 3173 // for testing the compiler; turn off all flags that inhibit compilation 3174 set_mode_flags(_comp); 3175 // -Xshare:dump 3176 } else if (match_option(option, "-Xshare:dump")) { 3177 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3178 return JNI_EINVAL; 3179 } 3180 set_mode_flags(_int); // Prevent compilation, which creates objects 3181 // -Xshare:on 3182 } else if (match_option(option, "-Xshare:on")) { 3183 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3184 return JNI_EINVAL; 3185 } 3186 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3187 return JNI_EINVAL; 3188 } 3189 // -Xshare:auto 3190 } else if (match_option(option, "-Xshare:auto")) { 3191 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3192 return JNI_EINVAL; 3193 } 3194 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3195 return JNI_EINVAL; 3196 } 3197 // -Xshare:off 3198 } else if (match_option(option, "-Xshare:off")) { 3199 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3200 return JNI_EINVAL; 3201 } 3202 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3203 return JNI_EINVAL; 3204 } 3205 // -Xverify 3206 } else if (match_option(option, "-Xverify", &tail)) { 3207 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3208 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3209 return JNI_EINVAL; 3210 } 3211 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3212 return JNI_EINVAL; 3213 } 3214 } else if (strcmp(tail, ":remote") == 0) { 3215 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3216 return JNI_EINVAL; 3217 } 3218 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3219 return JNI_EINVAL; 3220 } 3221 } else if (strcmp(tail, ":none") == 0) { 3222 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3223 return JNI_EINVAL; 3224 } 3225 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3226 return JNI_EINVAL; 3227 } 3228 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3229 return JNI_EINVAL; 3230 } 3231 // -Xdebug 3232 } else if (match_option(option, "-Xdebug")) { 3233 // note this flag has been used, then ignore 3234 set_xdebug_mode(true); 3235 // -Xnoagent 3236 } else if (match_option(option, "-Xnoagent")) { 3237 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3238 } else if (match_option(option, "-Xloggc:", &tail)) { 3239 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3240 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3241 _gc_log_filename = os::strdup_check_oom(tail); 3242 } else if (match_option(option, "-Xlog", &tail)) { 3243 bool ret = false; 3244 if (strcmp(tail, ":help") == 0) { 3245 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3246 vm_exit(0); 3247 } else if (strcmp(tail, ":disable") == 0) { 3248 LogConfiguration::disable_logging(); 3249 ret = true; 3250 } else if (*tail == '\0') { 3251 ret = LogConfiguration::parse_command_line_arguments(); 3252 assert(ret, "-Xlog without arguments should never fail to parse"); 3253 } else if (*tail == ':') { 3254 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3255 } 3256 if (ret == false) { 3257 jio_fprintf(defaultStream::error_stream(), 3258 "Invalid -Xlog option '-Xlog%s'\n", 3259 tail); 3260 return JNI_EINVAL; 3261 } 3262 // JNI hooks 3263 } else if (match_option(option, "-Xcheck", &tail)) { 3264 if (!strcmp(tail, ":jni")) { 3265 #if !INCLUDE_JNI_CHECK 3266 warning("JNI CHECKING is not supported in this VM"); 3267 #else 3268 CheckJNICalls = true; 3269 #endif // INCLUDE_JNI_CHECK 3270 } else if (is_bad_option(option, args->ignoreUnrecognized, 3271 "check")) { 3272 return JNI_EINVAL; 3273 } 3274 } else if (match_option(option, "vfprintf")) { 3275 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3276 } else if (match_option(option, "exit")) { 3277 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3278 } else if (match_option(option, "abort")) { 3279 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3280 // -XX:+AggressiveHeap 3281 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3282 jint result = set_aggressive_heap_flags(); 3283 if (result != JNI_OK) { 3284 return result; 3285 } 3286 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3287 // and the last option wins. 3288 } else if (match_option(option, "-XX:+NeverTenure")) { 3289 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3290 return JNI_EINVAL; 3291 } 3292 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3293 return JNI_EINVAL; 3294 } 3295 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3296 return JNI_EINVAL; 3297 } 3298 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3299 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3300 return JNI_EINVAL; 3301 } 3302 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3303 return JNI_EINVAL; 3304 } 3305 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3306 return JNI_EINVAL; 3307 } 3308 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3309 uintx max_tenuring_thresh = 0; 3310 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3311 jio_fprintf(defaultStream::error_stream(), 3312 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3313 return JNI_EINVAL; 3314 } 3315 3316 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3317 return JNI_EINVAL; 3318 } 3319 3320 if (MaxTenuringThreshold == 0) { 3321 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3322 return JNI_EINVAL; 3323 } 3324 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3325 return JNI_EINVAL; 3326 } 3327 } else { 3328 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3329 return JNI_EINVAL; 3330 } 3331 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3332 return JNI_EINVAL; 3333 } 3334 } 3335 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3336 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3337 return JNI_EINVAL; 3338 } 3339 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3340 return JNI_EINVAL; 3341 } 3342 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3343 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3344 return JNI_EINVAL; 3345 } 3346 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3347 return JNI_EINVAL; 3348 } 3349 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3350 #if defined(DTRACE_ENABLED) 3351 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3352 return JNI_EINVAL; 3353 } 3354 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3355 return JNI_EINVAL; 3356 } 3357 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3358 return JNI_EINVAL; 3359 } 3360 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3361 return JNI_EINVAL; 3362 } 3363 #else // defined(DTRACE_ENABLED) 3364 jio_fprintf(defaultStream::error_stream(), 3365 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3366 return JNI_EINVAL; 3367 #endif // defined(DTRACE_ENABLED) 3368 #ifdef ASSERT 3369 } else if (match_option(option, "-XX:+FullGCALot")) { 3370 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3371 return JNI_EINVAL; 3372 } 3373 // disable scavenge before parallel mark-compact 3374 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3375 return JNI_EINVAL; 3376 } 3377 #endif 3378 #if !INCLUDE_MANAGEMENT 3379 } else if (match_option(option, "-XX:+ManagementServer")) { 3380 jio_fprintf(defaultStream::error_stream(), 3381 "ManagementServer is not supported in this VM.\n"); 3382 return JNI_ERR; 3383 #endif // INCLUDE_MANAGEMENT 3384 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3385 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3386 // already been handled 3387 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3388 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3389 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3390 return JNI_EINVAL; 3391 } 3392 } 3393 // Unknown option 3394 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3395 return JNI_ERR; 3396 } 3397 } 3398 3399 // PrintSharedArchiveAndExit will turn on 3400 // -Xshare:on 3401 // -Xlog:class+path=info 3402 if (PrintSharedArchiveAndExit) { 3403 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3404 return JNI_EINVAL; 3405 } 3406 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3407 return JNI_EINVAL; 3408 } 3409 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3410 } 3411 3412 // Change the default value for flags which have different default values 3413 // when working with older JDKs. 3414 #ifdef LINUX 3415 if (JDK_Version::current().compare_major(6) <= 0 && 3416 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3417 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3418 } 3419 #endif // LINUX 3420 fix_appclasspath(); 3421 return JNI_OK; 3422 } 3423 3424 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3425 // For java.base check for duplicate --patch-module options being specified on the command line. 3426 // This check is only required for java.base, all other duplicate module specifications 3427 // will be checked during module system initialization. The module system initialization 3428 // will throw an ExceptionInInitializerError if this situation occurs. 3429 if (strcmp(module_name, "java.base") == 0) { 3430 if (*patch_mod_javabase) { 3431 vm_exit_during_initialization("Cannot specify java.base more than once to --patch-module"); 3432 } else { 3433 *patch_mod_javabase = true; 3434 } 3435 } 3436 3437 // Create GrowableArray lazily, only if --patch-module has been specified 3438 if (_patch_mod_prefix == NULL) { 3439 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3440 } 3441 3442 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3443 } 3444 3445 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3446 // 3447 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3448 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3449 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3450 // path is treated as the current directory. 3451 // 3452 // This causes problems with CDS, which requires that all directories specified in the classpath 3453 // must be empty. In most cases, applications do NOT want to load classes from the current 3454 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3455 // scripts compatible with CDS. 3456 void Arguments::fix_appclasspath() { 3457 if (IgnoreEmptyClassPaths) { 3458 const char separator = *os::path_separator(); 3459 const char* src = _java_class_path->value(); 3460 3461 // skip over all the leading empty paths 3462 while (*src == separator) { 3463 src ++; 3464 } 3465 3466 char* copy = os::strdup_check_oom(src, mtArguments); 3467 3468 // trim all trailing empty paths 3469 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3470 *tail = '\0'; 3471 } 3472 3473 char from[3] = {separator, separator, '\0'}; 3474 char to [2] = {separator, '\0'}; 3475 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3476 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3477 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3478 } 3479 3480 _java_class_path->set_writeable_value(copy); 3481 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3482 } 3483 } 3484 3485 static bool has_jar_files(const char* directory) { 3486 DIR* dir = os::opendir(directory); 3487 if (dir == NULL) return false; 3488 3489 struct dirent *entry; 3490 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3491 bool hasJarFile = false; 3492 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3493 const char* name = entry->d_name; 3494 const char* ext = name + strlen(name) - 4; 3495 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3496 } 3497 FREE_C_HEAP_ARRAY(char, dbuf); 3498 os::closedir(dir); 3499 return hasJarFile ; 3500 } 3501 3502 static int check_non_empty_dirs(const char* path) { 3503 const char separator = *os::path_separator(); 3504 const char* const end = path + strlen(path); 3505 int nonEmptyDirs = 0; 3506 while (path < end) { 3507 const char* tmp_end = strchr(path, separator); 3508 if (tmp_end == NULL) { 3509 if (has_jar_files(path)) { 3510 nonEmptyDirs++; 3511 jio_fprintf(defaultStream::output_stream(), 3512 "Non-empty directory: %s\n", path); 3513 } 3514 path = end; 3515 } else { 3516 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3517 memcpy(dirpath, path, tmp_end - path); 3518 dirpath[tmp_end - path] = '\0'; 3519 if (has_jar_files(dirpath)) { 3520 nonEmptyDirs++; 3521 jio_fprintf(defaultStream::output_stream(), 3522 "Non-empty directory: %s\n", dirpath); 3523 } 3524 FREE_C_HEAP_ARRAY(char, dirpath); 3525 path = tmp_end + 1; 3526 } 3527 } 3528 return nonEmptyDirs; 3529 } 3530 3531 jint Arguments::finalize_vm_init_args() { 3532 // check if the default lib/endorsed directory exists; if so, error 3533 char path[JVM_MAXPATHLEN]; 3534 const char* fileSep = os::file_separator(); 3535 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3536 3537 if (CheckEndorsedAndExtDirs) { 3538 int nonEmptyDirs = 0; 3539 // check endorsed directory 3540 nonEmptyDirs += check_non_empty_dirs(path); 3541 // check the extension directories 3542 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3543 if (nonEmptyDirs > 0) { 3544 return JNI_ERR; 3545 } 3546 } 3547 3548 DIR* dir = os::opendir(path); 3549 if (dir != NULL) { 3550 jio_fprintf(defaultStream::output_stream(), 3551 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3552 "in modular form will be supported via the concept of upgradeable modules.\n"); 3553 os::closedir(dir); 3554 return JNI_ERR; 3555 } 3556 3557 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3558 dir = os::opendir(path); 3559 if (dir != NULL) { 3560 jio_fprintf(defaultStream::output_stream(), 3561 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3562 "Use -classpath instead.\n."); 3563 os::closedir(dir); 3564 return JNI_ERR; 3565 } 3566 3567 // This must be done after all arguments have been processed. 3568 // java_compiler() true means set to "NONE" or empty. 3569 if (java_compiler() && !xdebug_mode()) { 3570 // For backwards compatibility, we switch to interpreted mode if 3571 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3572 // not specified. 3573 set_mode_flags(_int); 3574 } 3575 3576 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3577 // but like -Xint, leave compilation thresholds unaffected. 3578 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3579 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3580 set_mode_flags(_int); 3581 } 3582 3583 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3584 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3585 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3586 } 3587 3588 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3589 // Don't degrade server performance for footprint 3590 if (FLAG_IS_DEFAULT(UseLargePages) && 3591 MaxHeapSize < LargePageHeapSizeThreshold) { 3592 // No need for large granularity pages w/small heaps. 3593 // Note that large pages are enabled/disabled for both the 3594 // Java heap and the code cache. 3595 FLAG_SET_DEFAULT(UseLargePages, false); 3596 } 3597 3598 #elif defined(COMPILER2) 3599 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3600 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3601 } 3602 #endif 3603 3604 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3605 UNSUPPORTED_OPTION(ProfileInterpreter); 3606 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3607 #endif 3608 3609 #ifndef TIERED 3610 // Tiered compilation is undefined. 3611 UNSUPPORTED_OPTION(TieredCompilation); 3612 #endif 3613 3614 #if INCLUDE_JVMCI 3615 if (EnableJVMCI && 3616 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) { 3617 return JNI_ENOMEM; 3618 } 3619 #endif 3620 3621 // If we are running in a headless jre, force java.awt.headless property 3622 // to be true unless the property has already been set. 3623 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3624 if (os::is_headless_jre()) { 3625 const char* headless = Arguments::get_property("java.awt.headless"); 3626 if (headless == NULL) { 3627 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3628 if (headless_env == NULL) { 3629 if (!add_property("java.awt.headless=true")) { 3630 return JNI_ENOMEM; 3631 } 3632 } else { 3633 char buffer[256]; 3634 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3635 if (!add_property(buffer)) { 3636 return JNI_ENOMEM; 3637 } 3638 } 3639 } 3640 } 3641 3642 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3643 // CMS can only be used with ParNew 3644 FLAG_SET_ERGO(bool, UseParNewGC, true); 3645 } 3646 3647 if (!check_vm_args_consistency()) { 3648 return JNI_ERR; 3649 } 3650 3651 return JNI_OK; 3652 } 3653 3654 // Helper class for controlling the lifetime of JavaVMInitArgs 3655 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3656 // deleted on the destruction of the ScopedVMInitArgs object. 3657 class ScopedVMInitArgs : public StackObj { 3658 private: 3659 JavaVMInitArgs _args; 3660 char* _container_name; 3661 bool _is_set; 3662 char* _vm_options_file_arg; 3663 3664 public: 3665 ScopedVMInitArgs(const char *container_name) { 3666 _args.version = JNI_VERSION_1_2; 3667 _args.nOptions = 0; 3668 _args.options = NULL; 3669 _args.ignoreUnrecognized = false; 3670 _container_name = (char *)container_name; 3671 _is_set = false; 3672 _vm_options_file_arg = NULL; 3673 } 3674 3675 // Populates the JavaVMInitArgs object represented by this 3676 // ScopedVMInitArgs object with the arguments in options. The 3677 // allocated memory is deleted by the destructor. If this method 3678 // returns anything other than JNI_OK, then this object is in a 3679 // partially constructed state, and should be abandoned. 3680 jint set_args(GrowableArray<JavaVMOption>* options) { 3681 _is_set = true; 3682 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3683 JavaVMOption, options->length(), mtArguments); 3684 if (options_arr == NULL) { 3685 return JNI_ENOMEM; 3686 } 3687 _args.options = options_arr; 3688 3689 for (int i = 0; i < options->length(); i++) { 3690 options_arr[i] = options->at(i); 3691 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3692 if (options_arr[i].optionString == NULL) { 3693 // Rely on the destructor to do cleanup. 3694 _args.nOptions = i; 3695 return JNI_ENOMEM; 3696 } 3697 } 3698 3699 _args.nOptions = options->length(); 3700 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3701 return JNI_OK; 3702 } 3703 3704 JavaVMInitArgs* get() { return &_args; } 3705 char* container_name() { return _container_name; } 3706 bool is_set() { return _is_set; } 3707 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3708 char* vm_options_file_arg() { return _vm_options_file_arg; } 3709 3710 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3711 if (_vm_options_file_arg != NULL) { 3712 os::free(_vm_options_file_arg); 3713 } 3714 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3715 } 3716 3717 ~ScopedVMInitArgs() { 3718 if (_vm_options_file_arg != NULL) { 3719 os::free(_vm_options_file_arg); 3720 } 3721 if (_args.options == NULL) return; 3722 for (int i = 0; i < _args.nOptions; i++) { 3723 os::free(_args.options[i].optionString); 3724 } 3725 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3726 } 3727 3728 // Insert options into this option list, to replace option at 3729 // vm_options_file_pos (-XX:VMOptionsFile) 3730 jint insert(const JavaVMInitArgs* args, 3731 const JavaVMInitArgs* args_to_insert, 3732 const int vm_options_file_pos) { 3733 assert(_args.options == NULL, "shouldn't be set yet"); 3734 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3735 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3736 3737 int length = args->nOptions + args_to_insert->nOptions - 1; 3738 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3739 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3740 for (int i = 0; i < args->nOptions; i++) { 3741 if (i == vm_options_file_pos) { 3742 // insert the new options starting at the same place as the 3743 // -XX:VMOptionsFile option 3744 for (int j = 0; j < args_to_insert->nOptions; j++) { 3745 options->push(args_to_insert->options[j]); 3746 } 3747 } else { 3748 options->push(args->options[i]); 3749 } 3750 } 3751 // make into options array 3752 jint result = set_args(options); 3753 delete options; 3754 return result; 3755 } 3756 }; 3757 3758 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3759 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3760 } 3761 3762 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3763 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3764 } 3765 3766 jint Arguments::parse_options_environment_variable(const char* name, 3767 ScopedVMInitArgs* vm_args) { 3768 char *buffer = ::getenv(name); 3769 3770 // Don't check this environment variable if user has special privileges 3771 // (e.g. unix su command). 3772 if (buffer == NULL || os::have_special_privileges()) { 3773 return JNI_OK; 3774 } 3775 3776 if ((buffer = os::strdup(buffer)) == NULL) { 3777 return JNI_ENOMEM; 3778 } 3779 3780 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3781 3782 os::free(buffer); 3783 return retcode; 3784 } 3785 3786 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3787 // read file into buffer 3788 int fd = ::open(file_name, O_RDONLY); 3789 if (fd < 0) { 3790 jio_fprintf(defaultStream::error_stream(), 3791 "Could not open options file '%s'\n", 3792 file_name); 3793 return JNI_ERR; 3794 } 3795 3796 struct stat stbuf; 3797 int retcode = os::stat(file_name, &stbuf); 3798 if (retcode != 0) { 3799 jio_fprintf(defaultStream::error_stream(), 3800 "Could not stat options file '%s'\n", 3801 file_name); 3802 os::close(fd); 3803 return JNI_ERR; 3804 } 3805 3806 if (stbuf.st_size == 0) { 3807 // tell caller there is no option data and that is ok 3808 os::close(fd); 3809 return JNI_OK; 3810 } 3811 3812 // '+ 1' for NULL termination even with max bytes 3813 size_t bytes_alloc = stbuf.st_size + 1; 3814 3815 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3816 if (NULL == buf) { 3817 jio_fprintf(defaultStream::error_stream(), 3818 "Could not allocate read buffer for options file parse\n"); 3819 os::close(fd); 3820 return JNI_ENOMEM; 3821 } 3822 3823 memset(buf, 0, bytes_alloc); 3824 3825 // Fill buffer 3826 // Use ::read() instead of os::read because os::read() 3827 // might do a thread state transition 3828 // and it is too early for that here 3829 3830 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3831 os::close(fd); 3832 if (bytes_read < 0) { 3833 FREE_C_HEAP_ARRAY(char, buf); 3834 jio_fprintf(defaultStream::error_stream(), 3835 "Could not read options file '%s'\n", file_name); 3836 return JNI_ERR; 3837 } 3838 3839 if (bytes_read == 0) { 3840 // tell caller there is no option data and that is ok 3841 FREE_C_HEAP_ARRAY(char, buf); 3842 return JNI_OK; 3843 } 3844 3845 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3846 3847 FREE_C_HEAP_ARRAY(char, buf); 3848 return retcode; 3849 } 3850 3851 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3852 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3853 3854 // some pointers to help with parsing 3855 char *buffer_end = buffer + buf_len; 3856 char *opt_hd = buffer; 3857 char *wrt = buffer; 3858 char *rd = buffer; 3859 3860 // parse all options 3861 while (rd < buffer_end) { 3862 // skip leading white space from the input string 3863 while (rd < buffer_end && isspace(*rd)) { 3864 rd++; 3865 } 3866 3867 if (rd >= buffer_end) { 3868 break; 3869 } 3870 3871 // Remember this is where we found the head of the token. 3872 opt_hd = wrt; 3873 3874 // Tokens are strings of non white space characters separated 3875 // by one or more white spaces. 3876 while (rd < buffer_end && !isspace(*rd)) { 3877 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3878 int quote = *rd; // matching quote to look for 3879 rd++; // don't copy open quote 3880 while (rd < buffer_end && *rd != quote) { 3881 // include everything (even spaces) 3882 // up until the close quote 3883 *wrt++ = *rd++; // copy to option string 3884 } 3885 3886 if (rd < buffer_end) { 3887 rd++; // don't copy close quote 3888 } else { 3889 // did not see closing quote 3890 jio_fprintf(defaultStream::error_stream(), 3891 "Unmatched quote in %s\n", name); 3892 delete options; 3893 return JNI_ERR; 3894 } 3895 } else { 3896 *wrt++ = *rd++; // copy to option string 3897 } 3898 } 3899 3900 // steal a white space character and set it to NULL 3901 *wrt++ = '\0'; 3902 // We now have a complete token 3903 3904 JavaVMOption option; 3905 option.optionString = opt_hd; 3906 option.extraInfo = NULL; 3907 3908 options->append(option); // Fill in option 3909 3910 rd++; // Advance to next character 3911 } 3912 3913 // Fill out JavaVMInitArgs structure. 3914 jint status = vm_args->set_args(options); 3915 3916 delete options; 3917 return status; 3918 } 3919 3920 void Arguments::set_shared_spaces_flags() { 3921 if (DumpSharedSpaces) { 3922 if (FailOverToOldVerifier) { 3923 // Don't fall back to the old verifier on verification failure. If a 3924 // class fails verification with the split verifier, it might fail the 3925 // CDS runtime verifier constraint check. In that case, we don't want 3926 // to share the class. We only archive classes that pass the split verifier. 3927 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3928 } 3929 3930 if (RequireSharedSpaces) { 3931 warning("Cannot dump shared archive while using shared archive"); 3932 } 3933 UseSharedSpaces = false; 3934 #ifdef _LP64 3935 if (!UseCompressedOops || !UseCompressedClassPointers) { 3936 vm_exit_during_initialization( 3937 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3938 } 3939 } else { 3940 if (!UseCompressedOops || !UseCompressedClassPointers) { 3941 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3942 } 3943 #endif 3944 } 3945 } 3946 3947 // Sharing support 3948 // Construct the path to the archive 3949 static char* get_shared_archive_path() { 3950 char *shared_archive_path; 3951 if (SharedArchiveFile == NULL) { 3952 char jvm_path[JVM_MAXPATHLEN]; 3953 os::jvm_path(jvm_path, sizeof(jvm_path)); 3954 char *end = strrchr(jvm_path, *os::file_separator()); 3955 if (end != NULL) *end = '\0'; 3956 size_t jvm_path_len = strlen(jvm_path); 3957 size_t file_sep_len = strlen(os::file_separator()); 3958 const size_t len = jvm_path_len + file_sep_len + 20; 3959 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3960 if (shared_archive_path != NULL) { 3961 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3962 jvm_path, os::file_separator()); 3963 } 3964 } else { 3965 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3966 } 3967 return shared_archive_path; 3968 } 3969 3970 #ifndef PRODUCT 3971 // Determine whether LogVMOutput should be implicitly turned on. 3972 static bool use_vm_log() { 3973 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3974 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3975 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3976 PrintAssembly || TraceDeoptimization || TraceDependencies || 3977 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3978 return true; 3979 } 3980 3981 #ifdef COMPILER1 3982 if (PrintC1Statistics) { 3983 return true; 3984 } 3985 #endif // COMPILER1 3986 3987 #ifdef COMPILER2 3988 if (PrintOptoAssembly || PrintOptoStatistics) { 3989 return true; 3990 } 3991 #endif // COMPILER2 3992 3993 return false; 3994 } 3995 3996 #endif // PRODUCT 3997 3998 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3999 for (int index = 0; index < args->nOptions; index++) { 4000 const JavaVMOption* option = args->options + index; 4001 const char* tail; 4002 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4003 return true; 4004 } 4005 } 4006 return false; 4007 } 4008 4009 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4010 const char* vm_options_file, 4011 const int vm_options_file_pos, 4012 ScopedVMInitArgs* vm_options_file_args, 4013 ScopedVMInitArgs* args_out) { 4014 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4015 if (code != JNI_OK) { 4016 return code; 4017 } 4018 4019 if (vm_options_file_args->get()->nOptions < 1) { 4020 return JNI_OK; 4021 } 4022 4023 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4024 jio_fprintf(defaultStream::error_stream(), 4025 "A VM options file may not refer to a VM options file. " 4026 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4027 "options file '%s' in options container '%s' is an error.\n", 4028 vm_options_file_args->vm_options_file_arg(), 4029 vm_options_file_args->container_name()); 4030 return JNI_EINVAL; 4031 } 4032 4033 return args_out->insert(args, vm_options_file_args->get(), 4034 vm_options_file_pos); 4035 } 4036 4037 // Expand -XX:VMOptionsFile found in args_in as needed. 4038 // mod_args and args_out parameters may return values as needed. 4039 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4040 ScopedVMInitArgs* mod_args, 4041 JavaVMInitArgs** args_out) { 4042 jint code = match_special_option_and_act(args_in, mod_args); 4043 if (code != JNI_OK) { 4044 return code; 4045 } 4046 4047 if (mod_args->is_set()) { 4048 // args_in contains -XX:VMOptionsFile and mod_args contains the 4049 // original options from args_in along with the options expanded 4050 // from the VMOptionsFile. Return a short-hand to the caller. 4051 *args_out = mod_args->get(); 4052 } else { 4053 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4054 } 4055 return JNI_OK; 4056 } 4057 4058 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4059 ScopedVMInitArgs* args_out) { 4060 // Remaining part of option string 4061 const char* tail; 4062 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4063 4064 for (int index = 0; index < args->nOptions; index++) { 4065 const JavaVMOption* option = args->options + index; 4066 if (ArgumentsExt::process_options(option)) { 4067 continue; 4068 } 4069 if (match_option(option, "-XX:Flags=", &tail)) { 4070 Arguments::set_jvm_flags_file(tail); 4071 continue; 4072 } 4073 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4074 if (vm_options_file_args.found_vm_options_file_arg()) { 4075 jio_fprintf(defaultStream::error_stream(), 4076 "The option '%s' is already specified in the options " 4077 "container '%s' so the specification of '%s' in the " 4078 "same options container is an error.\n", 4079 vm_options_file_args.vm_options_file_arg(), 4080 vm_options_file_args.container_name(), 4081 option->optionString); 4082 return JNI_EINVAL; 4083 } 4084 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4085 // If there's a VMOptionsFile, parse that 4086 jint code = insert_vm_options_file(args, tail, index, 4087 &vm_options_file_args, args_out); 4088 if (code != JNI_OK) { 4089 return code; 4090 } 4091 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4092 if (args_out->is_set()) { 4093 // The VMOptions file inserted some options so switch 'args' 4094 // to the new set of options, and continue processing which 4095 // preserves "last option wins" semantics. 4096 args = args_out->get(); 4097 // The first option from the VMOptionsFile replaces the 4098 // current option. So we back track to process the 4099 // replacement option. 4100 index--; 4101 } 4102 continue; 4103 } 4104 if (match_option(option, "-XX:+PrintVMOptions")) { 4105 PrintVMOptions = true; 4106 continue; 4107 } 4108 if (match_option(option, "-XX:-PrintVMOptions")) { 4109 PrintVMOptions = false; 4110 continue; 4111 } 4112 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4113 IgnoreUnrecognizedVMOptions = true; 4114 continue; 4115 } 4116 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4117 IgnoreUnrecognizedVMOptions = false; 4118 continue; 4119 } 4120 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4121 CommandLineFlags::printFlags(tty, false); 4122 vm_exit(0); 4123 } 4124 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4125 #if INCLUDE_NMT 4126 // The launcher did not setup nmt environment variable properly. 4127 if (!MemTracker::check_launcher_nmt_support(tail)) { 4128 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4129 } 4130 4131 // Verify if nmt option is valid. 4132 if (MemTracker::verify_nmt_option()) { 4133 // Late initialization, still in single-threaded mode. 4134 if (MemTracker::tracking_level() >= NMT_summary) { 4135 MemTracker::init(); 4136 } 4137 } else { 4138 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4139 } 4140 continue; 4141 #else 4142 jio_fprintf(defaultStream::error_stream(), 4143 "Native Memory Tracking is not supported in this VM\n"); 4144 return JNI_ERR; 4145 #endif 4146 } 4147 4148 #ifndef PRODUCT 4149 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4150 CommandLineFlags::printFlags(tty, true); 4151 vm_exit(0); 4152 } 4153 #endif 4154 } 4155 return JNI_OK; 4156 } 4157 4158 static void print_options(const JavaVMInitArgs *args) { 4159 const char* tail; 4160 for (int index = 0; index < args->nOptions; index++) { 4161 const JavaVMOption *option = args->options + index; 4162 if (match_option(option, "-XX:", &tail)) { 4163 logOption(tail); 4164 } 4165 } 4166 } 4167 4168 bool Arguments::handle_deprecated_print_gc_flags() { 4169 if (PrintGC) { 4170 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4171 } 4172 if (PrintGCDetails) { 4173 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4174 } 4175 4176 if (_gc_log_filename != NULL) { 4177 // -Xloggc was used to specify a filename 4178 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4179 4180 LogTarget(Error, logging) target; 4181 LogStreamCHeap errstream(target); 4182 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4183 } else if (PrintGC || PrintGCDetails) { 4184 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4185 } 4186 return true; 4187 } 4188 4189 void Arguments::handle_extra_cms_flags(const char* msg) { 4190 SpecialFlag flag; 4191 const char *flag_name = "UseConcMarkSweepGC"; 4192 if (lookup_special_flag(flag_name, flag)) { 4193 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4194 warning("%s", msg); 4195 } 4196 } 4197 4198 // Parse entry point called from JNI_CreateJavaVM 4199 4200 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4201 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4202 4203 // Initialize ranges, constraints and writeables 4204 CommandLineFlagRangeList::init(); 4205 CommandLineFlagConstraintList::init(); 4206 CommandLineFlagWriteableList::init(); 4207 4208 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4209 const char* hotspotrc = ".hotspotrc"; 4210 bool settings_file_specified = false; 4211 bool needs_hotspotrc_warning = false; 4212 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4213 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4214 4215 // Pointers to current working set of containers 4216 JavaVMInitArgs* cur_cmd_args; 4217 JavaVMInitArgs* cur_java_options_args; 4218 JavaVMInitArgs* cur_java_tool_options_args; 4219 4220 // Containers for modified/expanded options 4221 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4222 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4223 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4224 4225 4226 jint code = 4227 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4228 if (code != JNI_OK) { 4229 return code; 4230 } 4231 4232 code = parse_java_options_environment_variable(&initial_java_options_args); 4233 if (code != JNI_OK) { 4234 return code; 4235 } 4236 4237 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4238 &mod_java_tool_options_args, 4239 &cur_java_tool_options_args); 4240 if (code != JNI_OK) { 4241 return code; 4242 } 4243 4244 code = expand_vm_options_as_needed(initial_cmd_args, 4245 &mod_cmd_args, 4246 &cur_cmd_args); 4247 if (code != JNI_OK) { 4248 return code; 4249 } 4250 4251 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4252 &mod_java_options_args, 4253 &cur_java_options_args); 4254 if (code != JNI_OK) { 4255 return code; 4256 } 4257 4258 const char* flags_file = Arguments::get_jvm_flags_file(); 4259 settings_file_specified = (flags_file != NULL); 4260 4261 if (IgnoreUnrecognizedVMOptions) { 4262 cur_cmd_args->ignoreUnrecognized = true; 4263 cur_java_tool_options_args->ignoreUnrecognized = true; 4264 cur_java_options_args->ignoreUnrecognized = true; 4265 } 4266 4267 // Parse specified settings file 4268 if (settings_file_specified) { 4269 if (!process_settings_file(flags_file, true, 4270 cur_cmd_args->ignoreUnrecognized)) { 4271 return JNI_EINVAL; 4272 } 4273 } else { 4274 #ifdef ASSERT 4275 // Parse default .hotspotrc settings file 4276 if (!process_settings_file(".hotspotrc", false, 4277 cur_cmd_args->ignoreUnrecognized)) { 4278 return JNI_EINVAL; 4279 } 4280 #else 4281 struct stat buf; 4282 if (os::stat(hotspotrc, &buf) == 0) { 4283 needs_hotspotrc_warning = true; 4284 } 4285 #endif 4286 } 4287 4288 if (PrintVMOptions) { 4289 print_options(cur_java_tool_options_args); 4290 print_options(cur_cmd_args); 4291 print_options(cur_java_options_args); 4292 } 4293 4294 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4295 jint result = parse_vm_init_args(cur_java_tool_options_args, 4296 cur_java_options_args, 4297 cur_cmd_args); 4298 4299 if (result != JNI_OK) { 4300 return result; 4301 } 4302 4303 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4304 SharedArchivePath = get_shared_archive_path(); 4305 if (SharedArchivePath == NULL) { 4306 return JNI_ENOMEM; 4307 } 4308 4309 // Set up VerifySharedSpaces 4310 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4311 VerifySharedSpaces = true; 4312 } 4313 4314 // Delay warning until here so that we've had a chance to process 4315 // the -XX:-PrintWarnings flag 4316 if (needs_hotspotrc_warning) { 4317 warning("%s file is present but has been ignored. " 4318 "Run with -XX:Flags=%s to load the file.", 4319 hotspotrc, hotspotrc); 4320 } 4321 4322 if (needs_module_property_warning) { 4323 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4324 " names that are reserved for internal use."); 4325 } 4326 4327 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4328 UNSUPPORTED_OPTION(UseLargePages); 4329 #endif 4330 4331 ArgumentsExt::report_unsupported_options(); 4332 4333 #ifndef PRODUCT 4334 if (TraceBytecodesAt != 0) { 4335 TraceBytecodes = true; 4336 } 4337 if (CountCompiledCalls) { 4338 if (UseCounterDecay) { 4339 warning("UseCounterDecay disabled because CountCalls is set"); 4340 UseCounterDecay = false; 4341 } 4342 } 4343 #endif // PRODUCT 4344 4345 if (ScavengeRootsInCode == 0) { 4346 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4347 warning("Forcing ScavengeRootsInCode non-zero"); 4348 } 4349 ScavengeRootsInCode = 1; 4350 } 4351 4352 if (!handle_deprecated_print_gc_flags()) { 4353 return JNI_EINVAL; 4354 } 4355 4356 // Set object alignment values. 4357 set_object_alignment(); 4358 4359 #if !INCLUDE_CDS 4360 if (DumpSharedSpaces || RequireSharedSpaces) { 4361 jio_fprintf(defaultStream::error_stream(), 4362 "Shared spaces are not supported in this VM\n"); 4363 return JNI_ERR; 4364 } 4365 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4366 warning("Shared spaces are not supported in this VM"); 4367 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4368 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4369 } 4370 no_shared_spaces("CDS Disabled"); 4371 #endif // INCLUDE_CDS 4372 4373 return JNI_OK; 4374 } 4375 4376 jint Arguments::apply_ergo() { 4377 4378 // Set flags based on ergonomics. 4379 set_ergonomics_flags(); 4380 4381 set_shared_spaces_flags(); 4382 4383 // Check the GC selections again. 4384 if (!check_gc_consistency()) { 4385 return JNI_EINVAL; 4386 } 4387 4388 if (TieredCompilation) { 4389 set_tiered_flags(); 4390 } else { 4391 int max_compilation_policy_choice = 1; 4392 #ifdef COMPILER2 4393 max_compilation_policy_choice = 2; 4394 #endif 4395 // Check if the policy is valid. 4396 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4397 vm_exit_during_initialization( 4398 "Incompatible compilation policy selected", NULL); 4399 } 4400 // Scale CompileThreshold 4401 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4402 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4403 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4404 } 4405 } 4406 4407 #ifdef COMPILER2 4408 #ifndef PRODUCT 4409 if (PrintIdealGraphLevel > 0) { 4410 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4411 } 4412 #endif 4413 #endif 4414 4415 // Set heap size based on available physical memory 4416 set_heap_size(); 4417 4418 ArgumentsExt::set_gc_specific_flags(); 4419 4420 // Initialize Metaspace flags and alignments 4421 Metaspace::ergo_initialize(); 4422 4423 // Set bytecode rewriting flags 4424 set_bytecode_flags(); 4425 4426 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4427 jint code = set_aggressive_opts_flags(); 4428 if (code != JNI_OK) { 4429 return code; 4430 } 4431 4432 // Turn off biased locking for locking debug mode flags, 4433 // which are subtly different from each other but neither works with 4434 // biased locking 4435 if (UseHeavyMonitors 4436 #ifdef COMPILER1 4437 || !UseFastLocking 4438 #endif // COMPILER1 4439 #if INCLUDE_JVMCI 4440 || !JVMCIUseFastLocking 4441 #endif 4442 ) { 4443 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4444 // flag set to true on command line; warn the user that they 4445 // can't enable biased locking here 4446 warning("Biased Locking is not supported with locking debug flags" 4447 "; ignoring UseBiasedLocking flag." ); 4448 } 4449 UseBiasedLocking = false; 4450 } 4451 4452 #ifdef CC_INTERP 4453 // Clear flags not supported on zero. 4454 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4455 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4456 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4457 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4458 #endif // CC_INTERP 4459 4460 #ifdef COMPILER2 4461 if (!EliminateLocks) { 4462 EliminateNestedLocks = false; 4463 } 4464 if (!Inline) { 4465 IncrementalInline = false; 4466 } 4467 #ifndef PRODUCT 4468 if (!IncrementalInline) { 4469 AlwaysIncrementalInline = false; 4470 } 4471 #endif 4472 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4473 // nothing to use the profiling, turn if off 4474 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4475 } 4476 #endif 4477 4478 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4479 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4480 DebugNonSafepoints = true; 4481 } 4482 4483 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4484 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4485 } 4486 4487 if (UseOnStackReplacement && !UseLoopCounter) { 4488 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4489 FLAG_SET_DEFAULT(UseLoopCounter, true); 4490 } 4491 4492 #ifndef PRODUCT 4493 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4494 if (use_vm_log()) { 4495 LogVMOutput = true; 4496 } 4497 } 4498 #endif // PRODUCT 4499 4500 if (PrintCommandLineFlags) { 4501 CommandLineFlags::printSetFlags(tty); 4502 } 4503 4504 // Apply CPU specific policy for the BiasedLocking 4505 if (UseBiasedLocking) { 4506 if (!VM_Version::use_biased_locking() && 4507 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4508 UseBiasedLocking = false; 4509 } 4510 } 4511 #ifdef COMPILER2 4512 if (!UseBiasedLocking || EmitSync != 0) { 4513 UseOptoBiasInlining = false; 4514 } 4515 #endif 4516 4517 return JNI_OK; 4518 } 4519 4520 jint Arguments::adjust_after_os() { 4521 if (UseNUMA) { 4522 if (UseParallelGC || UseParallelOldGC) { 4523 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4524 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4525 } 4526 } 4527 // UseNUMAInterleaving is set to ON for all collectors and 4528 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4529 // such as the parallel collector for Linux and Solaris will 4530 // interleave old gen and survivor spaces on top of NUMA 4531 // allocation policy for the eden space. 4532 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4533 // all platforms and ParallelGC on Windows will interleave all 4534 // of the heap spaces across NUMA nodes. 4535 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4536 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4537 } 4538 } 4539 return JNI_OK; 4540 } 4541 4542 int Arguments::PropertyList_count(SystemProperty* pl) { 4543 int count = 0; 4544 while(pl != NULL) { 4545 count++; 4546 pl = pl->next(); 4547 } 4548 return count; 4549 } 4550 4551 // Return the number of readable properties. 4552 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4553 int count = 0; 4554 while(pl != NULL) { 4555 if (pl->is_readable()) { 4556 count++; 4557 } 4558 pl = pl->next(); 4559 } 4560 return count; 4561 } 4562 4563 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4564 assert(key != NULL, "just checking"); 4565 SystemProperty* prop; 4566 for (prop = pl; prop != NULL; prop = prop->next()) { 4567 if (strcmp(key, prop->key()) == 0) return prop->value(); 4568 } 4569 return NULL; 4570 } 4571 4572 // Return the value of the requested property provided that it is a readable property. 4573 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4574 assert(key != NULL, "just checking"); 4575 SystemProperty* prop; 4576 // Return the property value if the keys match and the property is not internal or 4577 // it's the special internal property "jdk.boot.class.path.append". 4578 for (prop = pl; prop != NULL; prop = prop->next()) { 4579 if (strcmp(key, prop->key()) == 0) { 4580 if (!prop->internal()) { 4581 return prop->value(); 4582 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4583 return prop->value(); 4584 } else { 4585 // Property is internal and not jdk.boot.class.path.append so return NULL. 4586 return NULL; 4587 } 4588 } 4589 } 4590 return NULL; 4591 } 4592 4593 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4594 int count = 0; 4595 const char* ret_val = NULL; 4596 4597 while(pl != NULL) { 4598 if(count >= index) { 4599 ret_val = pl->key(); 4600 break; 4601 } 4602 count++; 4603 pl = pl->next(); 4604 } 4605 4606 return ret_val; 4607 } 4608 4609 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4610 int count = 0; 4611 char* ret_val = NULL; 4612 4613 while(pl != NULL) { 4614 if(count >= index) { 4615 ret_val = pl->value(); 4616 break; 4617 } 4618 count++; 4619 pl = pl->next(); 4620 } 4621 4622 return ret_val; 4623 } 4624 4625 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4626 SystemProperty* p = *plist; 4627 if (p == NULL) { 4628 *plist = new_p; 4629 } else { 4630 while (p->next() != NULL) { 4631 p = p->next(); 4632 } 4633 p->set_next(new_p); 4634 } 4635 } 4636 4637 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4638 bool writeable, bool internal) { 4639 if (plist == NULL) 4640 return; 4641 4642 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4643 PropertyList_add(plist, new_p); 4644 } 4645 4646 void Arguments::PropertyList_add(SystemProperty *element) { 4647 PropertyList_add(&_system_properties, element); 4648 } 4649 4650 // This add maintains unique property key in the list. 4651 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4652 PropertyAppendable append, PropertyWriteable writeable, 4653 PropertyInternal internal) { 4654 if (plist == NULL) 4655 return; 4656 4657 // If property key exist then update with new value. 4658 SystemProperty* prop; 4659 for (prop = *plist; prop != NULL; prop = prop->next()) { 4660 if (strcmp(k, prop->key()) == 0) { 4661 if (append == AppendProperty) { 4662 prop->append_value(v); 4663 } else { 4664 prop->set_value(v); 4665 } 4666 return; 4667 } 4668 } 4669 4670 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4671 } 4672 4673 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4674 // Returns true if all of the source pointed by src has been copied over to 4675 // the destination buffer pointed by buf. Otherwise, returns false. 4676 // Notes: 4677 // 1. If the length (buflen) of the destination buffer excluding the 4678 // NULL terminator character is not long enough for holding the expanded 4679 // pid characters, it also returns false instead of returning the partially 4680 // expanded one. 4681 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4682 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4683 char* buf, size_t buflen) { 4684 const char* p = src; 4685 char* b = buf; 4686 const char* src_end = &src[srclen]; 4687 char* buf_end = &buf[buflen - 1]; 4688 4689 while (p < src_end && b < buf_end) { 4690 if (*p == '%') { 4691 switch (*(++p)) { 4692 case '%': // "%%" ==> "%" 4693 *b++ = *p++; 4694 break; 4695 case 'p': { // "%p" ==> current process id 4696 // buf_end points to the character before the last character so 4697 // that we could write '\0' to the end of the buffer. 4698 size_t buf_sz = buf_end - b + 1; 4699 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4700 4701 // if jio_snprintf fails or the buffer is not long enough to hold 4702 // the expanded pid, returns false. 4703 if (ret < 0 || ret >= (int)buf_sz) { 4704 return false; 4705 } else { 4706 b += ret; 4707 assert(*b == '\0', "fail in copy_expand_pid"); 4708 if (p == src_end && b == buf_end + 1) { 4709 // reach the end of the buffer. 4710 return true; 4711 } 4712 } 4713 p++; 4714 break; 4715 } 4716 default : 4717 *b++ = '%'; 4718 } 4719 } else { 4720 *b++ = *p++; 4721 } 4722 } 4723 *b = '\0'; 4724 return (p == src_end); // return false if not all of the source was copied 4725 }