1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/moduleEntry.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "code/codeCacheExtensions.hpp" 32 #include "gc/shared/cardTableRS.hpp" 33 #include "gc/shared/genCollectedHeap.hpp" 34 #include "gc/shared/referenceProcessor.hpp" 35 #include "gc/shared/taskqueue.hpp" 36 #include "logging/log.hpp" 37 #include "logging/logConfiguration.hpp" 38 #include "logging/logStream.hpp" 39 #include "logging/logTag.hpp" 40 #include "memory/allocation.inline.hpp" 41 #include "memory/universe.inline.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "prims/jvmtiExport.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/arguments_ext.hpp" 46 #include "runtime/commandLineFlagConstraintList.hpp" 47 #include "runtime/commandLineFlagWriteableList.hpp" 48 #include "runtime/commandLineFlagRangeList.hpp" 49 #include "runtime/globals.hpp" 50 #include "runtime/globals_extension.hpp" 51 #include "runtime/java.hpp" 52 #include "runtime/os.hpp" 53 #include "runtime/vm_version.hpp" 54 #include "services/management.hpp" 55 #include "services/memTracker.hpp" 56 #include "utilities/defaultStream.hpp" 57 #include "utilities/macros.hpp" 58 #include "utilities/stringUtils.hpp" 59 #if INCLUDE_JVMCI 60 #include "jvmci/jvmciRuntime.hpp" 61 #endif 62 #if INCLUDE_ALL_GCS 63 #include "gc/cms/compactibleFreeListSpace.hpp" 64 #include "gc/g1/g1CollectedHeap.inline.hpp" 65 #include "gc/parallel/parallelScavengeHeap.hpp" 66 #endif // INCLUDE_ALL_GCS 67 68 // Note: This is a special bug reporting site for the JVM 69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 70 #define DEFAULT_JAVA_LAUNCHER "generic" 71 72 char* Arguments::_jvm_flags_file = NULL; 73 char** Arguments::_jvm_flags_array = NULL; 74 int Arguments::_num_jvm_flags = 0; 75 char** Arguments::_jvm_args_array = NULL; 76 int Arguments::_num_jvm_args = 0; 77 char* Arguments::_java_command = NULL; 78 SystemProperty* Arguments::_system_properties = NULL; 79 const char* Arguments::_gc_log_filename = NULL; 80 bool Arguments::_has_profile = false; 81 size_t Arguments::_conservative_max_heap_alignment = 0; 82 size_t Arguments::_min_heap_size = 0; 83 Arguments::Mode Arguments::_mode = _mixed; 84 bool Arguments::_java_compiler = false; 85 bool Arguments::_xdebug_mode = false; 86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 88 int Arguments::_sun_java_launcher_pid = -1; 89 bool Arguments::_sun_java_launcher_is_altjvm = false; 90 91 // These parameters are reset in method parse_vm_init_args() 92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 94 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 95 bool Arguments::_ClipInlining = ClipInlining; 96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 98 99 char* Arguments::SharedArchivePath = NULL; 100 101 AgentLibraryList Arguments::_libraryList; 102 AgentLibraryList Arguments::_agentList; 103 104 abort_hook_t Arguments::_abort_hook = NULL; 105 exit_hook_t Arguments::_exit_hook = NULL; 106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 107 108 109 SystemProperty *Arguments::_sun_boot_library_path = NULL; 110 SystemProperty *Arguments::_java_library_path = NULL; 111 SystemProperty *Arguments::_java_home = NULL; 112 SystemProperty *Arguments::_java_class_path = NULL; 113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 114 115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 116 PathString *Arguments::_system_boot_class_path = NULL; 117 bool Arguments::_has_jimage = false; 118 119 char* Arguments::_ext_dirs = NULL; 120 121 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 122 // part of the option string. 123 static bool match_option(const JavaVMOption *option, const char* name, 124 const char** tail) { 125 size_t len = strlen(name); 126 if (strncmp(option->optionString, name, len) == 0) { 127 *tail = option->optionString + len; 128 return true; 129 } else { 130 return false; 131 } 132 } 133 134 // Check if 'option' matches 'name'. No "tail" is allowed. 135 static bool match_option(const JavaVMOption *option, const char* name) { 136 const char* tail = NULL; 137 bool result = match_option(option, name, &tail); 138 if (tail != NULL && *tail == '\0') { 139 return result; 140 } else { 141 return false; 142 } 143 } 144 145 // Return true if any of the strings in null-terminated array 'names' matches. 146 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 147 // the option must match exactly. 148 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 149 bool tail_allowed) { 150 for (/* empty */; *names != NULL; ++names) { 151 if (match_option(option, *names, tail)) { 152 if (**tail == '\0' || tail_allowed && **tail == ':') { 153 return true; 154 } 155 } 156 } 157 return false; 158 } 159 160 static void logOption(const char* opt) { 161 if (PrintVMOptions) { 162 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 163 } 164 } 165 166 bool needs_module_property_warning = false; 167 168 #define MODULE_PROPERTY_PREFIX "jdk.module." 169 #define MODULE_PROPERTY_PREFIX_LEN 11 170 #define ADDEXPORTS "addexports" 171 #define ADDEXPORTS_LEN 10 172 #define ADDREADS "addreads" 173 #define ADDREADS_LEN 8 174 #define PATCH "patch" 175 #define PATCH_LEN 5 176 #define ADDMODS "addmods" 177 #define ADDMODS_LEN 7 178 #define LIMITMODS "limitmods" 179 #define LIMITMODS_LEN 9 180 #define PATH "path" 181 #define PATH_LEN 4 182 #define UPGRADE_PATH "upgrade.path" 183 #define UPGRADE_PATH_LEN 12 184 185 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 186 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 187 return ((strncmp(option, property, len) == 0) && 188 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 189 } 190 191 // Return true if property starts with "jdk.module." and its ensuing chars match 192 // any of the reserved module properties. 193 // property should be passed without the leading "-D". 194 bool Arguments::is_internal_module_property(const char* property) { 195 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 196 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 197 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 198 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 199 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 200 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 201 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 202 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 203 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 204 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 205 return true; 206 } 207 } 208 return false; 209 } 210 211 // Process java launcher properties. 212 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 213 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 214 // sun.java.launcher.pid is defined. 215 // Must do this before setting up other system properties, 216 // as some of them may depend on launcher type. 217 for (int index = 0; index < args->nOptions; index++) { 218 const JavaVMOption* option = args->options + index; 219 const char* tail; 220 221 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 222 process_java_launcher_argument(tail, option->extraInfo); 223 continue; 224 } 225 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 226 if (strcmp(tail, "true") == 0) { 227 _sun_java_launcher_is_altjvm = true; 228 } 229 continue; 230 } 231 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 232 _sun_java_launcher_pid = atoi(tail); 233 continue; 234 } 235 } 236 } 237 238 // Initialize system properties key and value. 239 void Arguments::init_system_properties() { 240 241 // Set up _system_boot_class_path which is not a property but 242 // relies heavily on argument processing and the jdk.boot.class.path.append 243 // property. It is used to store the underlying system boot class path. 244 _system_boot_class_path = new PathString(NULL); 245 246 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 247 "Java Virtual Machine Specification", false)); 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 249 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 251 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 252 253 // Following are JVMTI agent writable properties. 254 // Properties values are set to NULL and they are 255 // os specific they are initialized in os::init_system_properties_values(). 256 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 257 _java_library_path = new SystemProperty("java.library.path", NULL, true); 258 _java_home = new SystemProperty("java.home", NULL, true); 259 _java_class_path = new SystemProperty("java.class.path", "", true); 260 // jdk.boot.class.path.append is a non-writeable, internal property. 261 // It can only be set by either: 262 // - -Xbootclasspath/a: 263 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 264 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 265 266 // Add to System Property list. 267 PropertyList_add(&_system_properties, _sun_boot_library_path); 268 PropertyList_add(&_system_properties, _java_library_path); 269 PropertyList_add(&_system_properties, _java_home); 270 PropertyList_add(&_system_properties, _java_class_path); 271 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 272 273 // Set OS specific system properties values 274 os::init_system_properties_values(); 275 } 276 277 // Update/Initialize System properties after JDK version number is known 278 void Arguments::init_version_specific_system_properties() { 279 enum { bufsz = 16 }; 280 char buffer[bufsz]; 281 const char* spec_vendor = "Oracle Corporation"; 282 uint32_t spec_version = JDK_Version::current().major_version(); 283 284 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 285 286 PropertyList_add(&_system_properties, 287 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 288 PropertyList_add(&_system_properties, 289 new SystemProperty("java.vm.specification.version", buffer, false)); 290 PropertyList_add(&_system_properties, 291 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 292 } 293 294 /* 295 * -XX argument processing: 296 * 297 * -XX arguments are defined in several places, such as: 298 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 299 * -XX arguments are parsed in parse_argument(). 300 * -XX argument bounds checking is done in check_vm_args_consistency(). 301 * 302 * Over time -XX arguments may change. There are mechanisms to handle common cases: 303 * 304 * ALIASED: An option that is simply another name for another option. This is often 305 * part of the process of deprecating a flag, but not all aliases need 306 * to be deprecated. 307 * 308 * Create an alias for an option by adding the old and new option names to the 309 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 310 * 311 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 312 * support may be removed in the future. Both regular and aliased options may be 313 * deprecated. 314 * 315 * Add a deprecation warning for an option (or alias) by adding an entry in the 316 * "special_jvm_flags" table and setting the "deprecated_in" field. 317 * Often an option "deprecated" in one major release will 318 * be made "obsolete" in the next. In this case the entry should also have it's 319 * "obsolete_in" field set. 320 * 321 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 322 * on the command line. A warning is printed to let the user know that option might not 323 * be accepted in the future. 324 * 325 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 326 * table and setting the "obsolete_in" field. 327 * 328 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 329 * to the current JDK version. The system will flatly refuse to admit the existence of 330 * the flag. This allows a flag to die automatically over JDK releases. 331 * 332 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 333 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 334 * - Newly obsolete or expired deprecated options should have their global variable 335 * definitions removed (from globals.hpp, etc) and related implementations removed. 336 * 337 * Recommended approach for removing options: 338 * 339 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 340 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 341 * 342 * To remove internal options (e.g. diagnostic, experimental, develop options), use 343 * a 2-step model adding major release numbers to the obsolete and expire columns. 344 * 345 * To change the name of an option, use the alias table as well as a 2-step 346 * model adding major release numbers to the deprecate and expire columns. 347 * Think twice about aliasing commonly used customer options. 348 * 349 * There are times when it is appropriate to leave a future release number as undefined. 350 * 351 * Tests: Aliases should be tested in VMAliasOptions.java. 352 * Deprecated options should be tested in VMDeprecatedOptions.java. 353 */ 354 355 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 356 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 357 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 358 // the command-line as usual, but will issue a warning. 359 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 360 // the command-line, while issuing a warning and ignoring the flag value. 361 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 362 // existence of the flag. 363 // 364 // MANUAL CLEANUP ON JDK VERSION UPDATES: 365 // This table ensures that the handling of options will update automatically when the JDK 366 // version is incremented, but the source code needs to be cleanup up manually: 367 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 368 // variable should be removed, as well as users of the variable. 369 // - As "deprecated" options age into "obsolete" options, move the entry into the 370 // "Obsolete Flags" section of the table. 371 // - All expired options should be removed from the table. 372 static SpecialFlag const special_jvm_flags[] = { 373 // -------------- Deprecated Flags -------------- 374 // --- Non-alias flags - sorted by obsolete_in then expired_in: 375 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 376 { "AutoGCSelectPauseMillis", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 377 { "UseAutoGCSelectPolicy", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 378 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 379 { "ExplicitGCInvokesConcurrentAndUnloadsClasses", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 380 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 381 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 382 383 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 384 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 385 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 386 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 387 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 388 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 389 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 390 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 391 392 // -------------- Obsolete Flags - sorted by expired_in -------------- 393 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 394 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 395 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 396 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 397 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 398 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 399 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 400 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 401 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 402 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 403 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 404 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 405 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 406 #ifndef ZERO 407 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 408 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 409 #endif // ZERO 410 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 411 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 412 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 413 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 414 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 415 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 416 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 417 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 418 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 419 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 420 { "PrintOopAddress", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 421 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) }, 422 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::jdk(10) }, 423 424 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 425 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 426 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 427 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 428 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 429 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 430 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 431 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 432 #endif 433 434 { NULL, JDK_Version(0), JDK_Version(0) } 435 }; 436 437 // Flags that are aliases for other flags. 438 typedef struct { 439 const char* alias_name; 440 const char* real_name; 441 } AliasedFlag; 442 443 static AliasedFlag const aliased_jvm_flags[] = { 444 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 445 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 446 { "CMSMarkStackSize", "MarkStackSize" }, 447 { "G1MarkStackSize", "MarkStackSize" }, 448 { "ParallelMarkingThreads", "ConcGCThreads" }, 449 { "ParallelCMSThreads", "ConcGCThreads" }, 450 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 451 { NULL, NULL} 452 }; 453 454 // NOTE: A compatibility request will be necessary for each alias to be removed. 455 static AliasedLoggingFlag const aliased_logging_flags[] = { 456 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 457 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 458 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 459 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 460 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 461 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 462 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 463 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 464 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 465 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 466 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 467 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 468 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 469 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 470 }; 471 472 #ifndef PRODUCT 473 // These options are removed in jdk9. Remove this code for jdk10. 474 static AliasedFlag const removed_develop_logging_flags[] = { 475 { "TraceClassInitialization", "-Xlog:class+init" }, 476 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 477 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 478 { "TraceItables", "-Xlog:itables=debug" }, 479 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 480 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 481 { "TraceStartupTime", "-Xlog:startuptime" }, 482 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 483 { "PrintVtables", "-Xlog:vtables=debug" }, 484 { "VerboseVerification", "-Xlog:verification" }, 485 { NULL, NULL } 486 }; 487 #endif //PRODUCT 488 489 // Return true if "v" is less than "other", where "other" may be "undefined". 490 static bool version_less_than(JDK_Version v, JDK_Version other) { 491 assert(!v.is_undefined(), "must be defined"); 492 if (!other.is_undefined() && v.compare(other) >= 0) { 493 return false; 494 } else { 495 return true; 496 } 497 } 498 499 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 500 501 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 502 // Allow extensions to have priority 503 if (lookup_special_flag_ext(flag_name, flag)) { 504 return true; 505 } 506 507 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 508 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 509 flag = special_jvm_flags[i]; 510 return true; 511 } 512 } 513 return false; 514 } 515 516 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 517 assert(version != NULL, "Must provide a version buffer"); 518 SpecialFlag flag; 519 if (lookup_special_flag(flag_name, flag)) { 520 if (!flag.obsolete_in.is_undefined()) { 521 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 522 *version = flag.obsolete_in; 523 return true; 524 } 525 } 526 } 527 return false; 528 } 529 530 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 531 assert(version != NULL, "Must provide a version buffer"); 532 SpecialFlag flag; 533 if (lookup_special_flag(flag_name, flag)) { 534 if (!flag.deprecated_in.is_undefined()) { 535 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 536 version_less_than(JDK_Version::current(), flag.expired_in)) { 537 *version = flag.deprecated_in; 538 return 1; 539 } else { 540 return -1; 541 } 542 } 543 } 544 return 0; 545 } 546 547 #ifndef PRODUCT 548 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 549 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 550 const AliasedFlag& flag = removed_develop_logging_flags[i]; 551 if (strcmp(flag.alias_name, name) == 0) { 552 return flag.real_name; 553 } 554 } 555 return NULL; 556 } 557 #endif // PRODUCT 558 559 const char* Arguments::real_flag_name(const char *flag_name) { 560 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 561 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 562 if (strcmp(flag_status.alias_name, flag_name) == 0) { 563 return flag_status.real_name; 564 } 565 } 566 return flag_name; 567 } 568 569 #ifdef ASSERT 570 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 571 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 572 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 573 return true; 574 } 575 } 576 return false; 577 } 578 579 static bool verify_special_jvm_flags() { 580 bool success = true; 581 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 582 const SpecialFlag& flag = special_jvm_flags[i]; 583 if (lookup_special_flag(flag.name, i)) { 584 warning("Duplicate special flag declaration \"%s\"", flag.name); 585 success = false; 586 } 587 if (flag.deprecated_in.is_undefined() && 588 flag.obsolete_in.is_undefined()) { 589 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 590 success = false; 591 } 592 593 if (!flag.deprecated_in.is_undefined()) { 594 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 595 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 596 success = false; 597 } 598 599 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 600 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 601 success = false; 602 } 603 } 604 605 if (!flag.obsolete_in.is_undefined()) { 606 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 607 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 608 success = false; 609 } 610 611 // if flag has become obsolete it should not have a "globals" flag defined anymore. 612 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 613 if (Flag::find_flag(flag.name) != NULL) { 614 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 615 success = false; 616 } 617 } 618 } 619 620 if (!flag.expired_in.is_undefined()) { 621 // if flag has become expired it should not have a "globals" flag defined anymore. 622 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 623 if (Flag::find_flag(flag.name) != NULL) { 624 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 625 success = false; 626 } 627 } 628 } 629 630 } 631 return success; 632 } 633 #endif 634 635 // Parses a size specification string. 636 bool Arguments::atojulong(const char *s, julong* result) { 637 julong n = 0; 638 639 // First char must be a digit. Don't allow negative numbers or leading spaces. 640 if (!isdigit(*s)) { 641 return false; 642 } 643 644 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 645 char* remainder; 646 errno = 0; 647 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 648 if (errno != 0) { 649 return false; 650 } 651 652 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 653 if (remainder == s || strlen(remainder) > 1) { 654 return false; 655 } 656 657 switch (*remainder) { 658 case 'T': case 't': 659 *result = n * G * K; 660 // Check for overflow. 661 if (*result/((julong)G * K) != n) return false; 662 return true; 663 case 'G': case 'g': 664 *result = n * G; 665 if (*result/G != n) return false; 666 return true; 667 case 'M': case 'm': 668 *result = n * M; 669 if (*result/M != n) return false; 670 return true; 671 case 'K': case 'k': 672 *result = n * K; 673 if (*result/K != n) return false; 674 return true; 675 case '\0': 676 *result = n; 677 return true; 678 default: 679 return false; 680 } 681 } 682 683 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 684 if (size < min_size) return arg_too_small; 685 // Check that size will fit in a size_t (only relevant on 32-bit) 686 if (size > max_uintx) return arg_too_big; 687 return arg_in_range; 688 } 689 690 // Describe an argument out of range error 691 void Arguments::describe_range_error(ArgsRange errcode) { 692 switch(errcode) { 693 case arg_too_big: 694 jio_fprintf(defaultStream::error_stream(), 695 "The specified size exceeds the maximum " 696 "representable size.\n"); 697 break; 698 case arg_too_small: 699 case arg_unreadable: 700 case arg_in_range: 701 // do nothing for now 702 break; 703 default: 704 ShouldNotReachHere(); 705 } 706 } 707 708 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 709 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 710 return true; 711 } else { 712 return false; 713 } 714 } 715 716 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 717 char* end; 718 errno = 0; 719 double v = strtod(value, &end); 720 if ((errno != 0) || (*end != 0)) { 721 return false; 722 } 723 724 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 725 return true; 726 } 727 return false; 728 } 729 730 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 731 julong v; 732 int int_v; 733 intx intx_v; 734 bool is_neg = false; 735 Flag* result = Flag::find_flag(name, strlen(name)); 736 737 if (result == NULL) { 738 return false; 739 } 740 741 // Check the sign first since atojulong() parses only unsigned values. 742 if (*value == '-') { 743 if (!result->is_intx() && !result->is_int()) { 744 return false; 745 } 746 value++; 747 is_neg = true; 748 } 749 if (!Arguments::atojulong(value, &v)) { 750 return false; 751 } 752 if (result->is_int()) { 753 int_v = (int) v; 754 if (is_neg) { 755 int_v = -int_v; 756 } 757 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 758 } else if (result->is_uint()) { 759 uint uint_v = (uint) v; 760 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 761 } else if (result->is_intx()) { 762 intx_v = (intx) v; 763 if (is_neg) { 764 intx_v = -intx_v; 765 } 766 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 767 } else if (result->is_uintx()) { 768 uintx uintx_v = (uintx) v; 769 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 770 } else if (result->is_uint64_t()) { 771 uint64_t uint64_t_v = (uint64_t) v; 772 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 773 } else if (result->is_size_t()) { 774 size_t size_t_v = (size_t) v; 775 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 776 } else { 777 return false; 778 } 779 } 780 781 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 782 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 783 // Contract: CommandLineFlags always returns a pointer that needs freeing. 784 FREE_C_HEAP_ARRAY(char, value); 785 return true; 786 } 787 788 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 789 const char* old_value = ""; 790 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 791 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 792 size_t new_len = strlen(new_value); 793 const char* value; 794 char* free_this_too = NULL; 795 if (old_len == 0) { 796 value = new_value; 797 } else if (new_len == 0) { 798 value = old_value; 799 } else { 800 size_t length = old_len + 1 + new_len + 1; 801 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 802 // each new setting adds another LINE to the switch: 803 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 804 value = buf; 805 free_this_too = buf; 806 } 807 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 808 // CommandLineFlags always returns a pointer that needs freeing. 809 FREE_C_HEAP_ARRAY(char, value); 810 if (free_this_too != NULL) { 811 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 812 FREE_C_HEAP_ARRAY(char, free_this_too); 813 } 814 return true; 815 } 816 817 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 818 const char* real_name = real_flag_name(arg); 819 JDK_Version since = JDK_Version(); 820 switch (is_deprecated_flag(arg, &since)) { 821 case -1: 822 return NULL; // obsolete or expired, don't process normally 823 case 0: 824 return real_name; 825 case 1: { 826 if (warn) { 827 char version[256]; 828 since.to_string(version, sizeof(version)); 829 if (real_name != arg) { 830 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 831 arg, version, real_name); 832 } else { 833 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 834 arg, version); 835 } 836 } 837 return real_name; 838 } 839 } 840 ShouldNotReachHere(); 841 return NULL; 842 } 843 844 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 845 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 846 // Set tagset string buffer at max size of 256, large enough for any alias tagset 847 const int max_tagset_size = 256; 848 int max_tagset_len = max_tagset_size - 1; 849 char tagset_buffer[max_tagset_size]; 850 tagset_buffer[0] = '\0'; 851 852 // Write tag-set for aliased logging option, in string list form 853 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 854 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 855 if (i > 0) { 856 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 857 } 858 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 859 } 860 if (!alf.exactMatch) { 861 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 862 } 863 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 864 (on) ? "+" : "-", 865 name, 866 tagset_buffer, 867 (on) ? LogLevel::name(alf.level) : "off"); 868 } 869 870 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 871 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 872 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 873 if (strcmp(alf.alias_name, name) == 0) { 874 log_deprecated_flag(name, on, alf); 875 return alf; 876 } 877 } 878 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 879 return a; 880 } 881 882 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 883 884 // range of acceptable characters spelled out for portability reasons 885 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 886 #define BUFLEN 255 887 char name[BUFLEN+1]; 888 char dummy; 889 const char* real_name; 890 bool warn_if_deprecated = true; 891 892 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 893 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 894 if (alf.alias_name != NULL){ 895 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 896 return true; 897 } 898 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 899 if (real_name == NULL) { 900 return false; 901 } 902 return set_bool_flag(real_name, false, origin); 903 } 904 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 905 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 906 if (alf.alias_name != NULL){ 907 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 908 return true; 909 } 910 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 911 if (real_name == NULL) { 912 return false; 913 } 914 return set_bool_flag(real_name, true, origin); 915 } 916 917 char punct; 918 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 919 const char* value = strchr(arg, '=') + 1; 920 Flag* flag; 921 922 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 923 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 924 if (alf.alias_name != NULL) { 925 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 926 return true; 927 } 928 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 929 if (real_name == NULL) { 930 return false; 931 } 932 flag = Flag::find_flag(real_name); 933 if (flag != NULL && flag->is_ccstr()) { 934 if (flag->ccstr_accumulates()) { 935 return append_to_string_flag(real_name, value, origin); 936 } else { 937 if (value[0] == '\0') { 938 value = NULL; 939 } 940 return set_string_flag(real_name, value, origin); 941 } 942 } else { 943 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 944 } 945 } 946 947 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 948 const char* value = strchr(arg, '=') + 1; 949 // -XX:Foo:=xxx will reset the string flag to the given value. 950 if (value[0] == '\0') { 951 value = NULL; 952 } 953 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 954 if (real_name == NULL) { 955 return false; 956 } 957 return set_string_flag(real_name, value, origin); 958 } 959 960 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 961 #define SIGNED_NUMBER_RANGE "[-0123456789]" 962 #define NUMBER_RANGE "[0123456789eE+-]" 963 char value[BUFLEN + 1]; 964 char value2[BUFLEN + 1]; 965 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 966 // Looks like a floating-point number -- try again with more lenient format string 967 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 968 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 969 if (real_name == NULL) { 970 return false; 971 } 972 return set_fp_numeric_flag(real_name, value, origin); 973 } 974 } 975 976 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 977 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 978 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 979 if (real_name == NULL) { 980 return false; 981 } 982 return set_numeric_flag(real_name, value, origin); 983 } 984 985 return false; 986 } 987 988 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 989 assert(bldarray != NULL, "illegal argument"); 990 991 if (arg == NULL) { 992 return; 993 } 994 995 int new_count = *count + 1; 996 997 // expand the array and add arg to the last element 998 if (*bldarray == NULL) { 999 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1000 } else { 1001 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1002 } 1003 (*bldarray)[*count] = os::strdup_check_oom(arg); 1004 *count = new_count; 1005 } 1006 1007 void Arguments::build_jvm_args(const char* arg) { 1008 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1009 } 1010 1011 void Arguments::build_jvm_flags(const char* arg) { 1012 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1013 } 1014 1015 // utility function to return a string that concatenates all 1016 // strings in a given char** array 1017 const char* Arguments::build_resource_string(char** args, int count) { 1018 if (args == NULL || count == 0) { 1019 return NULL; 1020 } 1021 size_t length = 0; 1022 for (int i = 0; i < count; i++) { 1023 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1024 } 1025 char* s = NEW_RESOURCE_ARRAY(char, length); 1026 char* dst = s; 1027 for (int j = 0; j < count; j++) { 1028 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1029 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1030 dst += offset; 1031 length -= offset; 1032 } 1033 return (const char*) s; 1034 } 1035 1036 void Arguments::print_on(outputStream* st) { 1037 st->print_cr("VM Arguments:"); 1038 if (num_jvm_flags() > 0) { 1039 st->print("jvm_flags: "); print_jvm_flags_on(st); 1040 st->cr(); 1041 } 1042 if (num_jvm_args() > 0) { 1043 st->print("jvm_args: "); print_jvm_args_on(st); 1044 st->cr(); 1045 } 1046 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1047 if (_java_class_path != NULL) { 1048 char* path = _java_class_path->value(); 1049 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1050 } 1051 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1052 } 1053 1054 void Arguments::print_summary_on(outputStream* st) { 1055 // Print the command line. Environment variables that are helpful for 1056 // reproducing the problem are written later in the hs_err file. 1057 // flags are from setting file 1058 if (num_jvm_flags() > 0) { 1059 st->print_raw("Settings File: "); 1060 print_jvm_flags_on(st); 1061 st->cr(); 1062 } 1063 // args are the command line and environment variable arguments. 1064 st->print_raw("Command Line: "); 1065 if (num_jvm_args() > 0) { 1066 print_jvm_args_on(st); 1067 } 1068 // this is the classfile and any arguments to the java program 1069 if (java_command() != NULL) { 1070 st->print("%s", java_command()); 1071 } 1072 st->cr(); 1073 } 1074 1075 void Arguments::print_jvm_flags_on(outputStream* st) { 1076 if (_num_jvm_flags > 0) { 1077 for (int i=0; i < _num_jvm_flags; i++) { 1078 st->print("%s ", _jvm_flags_array[i]); 1079 } 1080 } 1081 } 1082 1083 void Arguments::print_jvm_args_on(outputStream* st) { 1084 if (_num_jvm_args > 0) { 1085 for (int i=0; i < _num_jvm_args; i++) { 1086 st->print("%s ", _jvm_args_array[i]); 1087 } 1088 } 1089 } 1090 1091 bool Arguments::process_argument(const char* arg, 1092 jboolean ignore_unrecognized, 1093 Flag::Flags origin) { 1094 JDK_Version since = JDK_Version(); 1095 1096 if (parse_argument(arg, origin)) { 1097 return true; 1098 } 1099 1100 // Determine if the flag has '+', '-', or '=' characters. 1101 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1102 const char* const argname = has_plus_minus ? arg + 1 : arg; 1103 1104 size_t arg_len; 1105 const char* equal_sign = strchr(argname, '='); 1106 if (equal_sign == NULL) { 1107 arg_len = strlen(argname); 1108 } else { 1109 arg_len = equal_sign - argname; 1110 } 1111 1112 // Only make the obsolete check for valid arguments. 1113 if (arg_len <= BUFLEN) { 1114 // Construct a string which consists only of the argument name without '+', '-', or '='. 1115 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1116 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1117 if (is_obsolete_flag(stripped_argname, &since)) { 1118 char version[256]; 1119 since.to_string(version, sizeof(version)); 1120 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1121 return true; 1122 } 1123 #ifndef PRODUCT 1124 else { 1125 const char* replacement; 1126 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1127 log_warning(arguments)("%s has been removed. Please use %s instead.", 1128 stripped_argname, 1129 replacement); 1130 return false; 1131 } 1132 } 1133 #endif //PRODUCT 1134 } 1135 1136 // For locked flags, report a custom error message if available. 1137 // Otherwise, report the standard unrecognized VM option. 1138 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1139 if (found_flag != NULL) { 1140 char locked_message_buf[BUFLEN]; 1141 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1142 if (strlen(locked_message_buf) == 0) { 1143 if (found_flag->is_bool() && !has_plus_minus) { 1144 jio_fprintf(defaultStream::error_stream(), 1145 "Missing +/- setting for VM option '%s'\n", argname); 1146 } else if (!found_flag->is_bool() && has_plus_minus) { 1147 jio_fprintf(defaultStream::error_stream(), 1148 "Unexpected +/- setting in VM option '%s'\n", argname); 1149 } else { 1150 jio_fprintf(defaultStream::error_stream(), 1151 "Improperly specified VM option '%s'\n", argname); 1152 } 1153 } else { 1154 #ifdef PRODUCT 1155 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1156 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1157 if (ignore_unrecognized && mismatched) { 1158 return true; 1159 } 1160 #endif 1161 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1162 } 1163 } else { 1164 if (ignore_unrecognized) { 1165 return true; 1166 } 1167 jio_fprintf(defaultStream::error_stream(), 1168 "Unrecognized VM option '%s'\n", argname); 1169 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1170 if (fuzzy_matched != NULL) { 1171 jio_fprintf(defaultStream::error_stream(), 1172 "Did you mean '%s%s%s'? ", 1173 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1174 fuzzy_matched->_name, 1175 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1176 } 1177 } 1178 1179 // allow for commandline "commenting out" options like -XX:#+Verbose 1180 return arg[0] == '#'; 1181 } 1182 1183 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1184 FILE* stream = fopen(file_name, "rb"); 1185 if (stream == NULL) { 1186 if (should_exist) { 1187 jio_fprintf(defaultStream::error_stream(), 1188 "Could not open settings file %s\n", file_name); 1189 return false; 1190 } else { 1191 return true; 1192 } 1193 } 1194 1195 char token[1024]; 1196 int pos = 0; 1197 1198 bool in_white_space = true; 1199 bool in_comment = false; 1200 bool in_quote = false; 1201 char quote_c = 0; 1202 bool result = true; 1203 1204 int c = getc(stream); 1205 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1206 if (in_white_space) { 1207 if (in_comment) { 1208 if (c == '\n') in_comment = false; 1209 } else { 1210 if (c == '#') in_comment = true; 1211 else if (!isspace(c)) { 1212 in_white_space = false; 1213 token[pos++] = c; 1214 } 1215 } 1216 } else { 1217 if (c == '\n' || (!in_quote && isspace(c))) { 1218 // token ends at newline, or at unquoted whitespace 1219 // this allows a way to include spaces in string-valued options 1220 token[pos] = '\0'; 1221 logOption(token); 1222 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1223 build_jvm_flags(token); 1224 pos = 0; 1225 in_white_space = true; 1226 in_quote = false; 1227 } else if (!in_quote && (c == '\'' || c == '"')) { 1228 in_quote = true; 1229 quote_c = c; 1230 } else if (in_quote && (c == quote_c)) { 1231 in_quote = false; 1232 } else { 1233 token[pos++] = c; 1234 } 1235 } 1236 c = getc(stream); 1237 } 1238 if (pos > 0) { 1239 token[pos] = '\0'; 1240 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1241 build_jvm_flags(token); 1242 } 1243 fclose(stream); 1244 return result; 1245 } 1246 1247 //============================================================================================================= 1248 // Parsing of properties (-D) 1249 1250 const char* Arguments::get_property(const char* key) { 1251 return PropertyList_get_value(system_properties(), key); 1252 } 1253 1254 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1255 const char* eq = strchr(prop, '='); 1256 const char* key; 1257 const char* value = ""; 1258 1259 if (eq == NULL) { 1260 // property doesn't have a value, thus use passed string 1261 key = prop; 1262 } else { 1263 // property have a value, thus extract it and save to the 1264 // allocated string 1265 size_t key_len = eq - prop; 1266 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1267 1268 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1269 key = tmp_key; 1270 1271 value = &prop[key_len + 1]; 1272 } 1273 1274 if (strcmp(key, "java.compiler") == 0) { 1275 process_java_compiler_argument(value); 1276 // Record value in Arguments, but let it get passed to Java. 1277 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1278 strcmp(key, "sun.java.launcher.pid") == 0) { 1279 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1280 // private and are processed in process_sun_java_launcher_properties(); 1281 // the sun.java.launcher property is passed on to the java application 1282 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1283 // append is true, writable is true, internal is false 1284 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1285 WriteableProperty, ExternalProperty); 1286 } else { 1287 if (strcmp(key, "sun.java.command") == 0) { 1288 char *old_java_command = _java_command; 1289 _java_command = os::strdup_check_oom(value, mtArguments); 1290 if (old_java_command != NULL) { 1291 os::free(old_java_command); 1292 } 1293 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1294 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1295 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1296 // its value without going through the property list or making a Java call. 1297 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1298 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1299 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1300 os::free((void *)old_java_vendor_url_bug); 1301 } 1302 } 1303 1304 // Create new property and add at the end of the list 1305 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1306 } 1307 1308 if (key != prop) { 1309 // SystemProperty copy passed value, thus free previously allocated 1310 // memory 1311 FreeHeap((void *)key); 1312 } 1313 1314 return true; 1315 } 1316 1317 #if INCLUDE_CDS 1318 void Arguments::check_unsupported_dumping_properties() { 1319 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1320 const char* unsupported_properties[] = { "jdk.module.main", 1321 "jdk.module.limitmods", 1322 "jdk.module.path", 1323 "jdk.module.upgrade.path", 1324 "jdk.module.addmods.0" }; 1325 const char* unsupported_options[] = { "-m", 1326 "--limit-modules", 1327 "--module-path", 1328 "--upgrade-module-path", 1329 "--add-modules" }; 1330 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1331 // If a vm option is found in the unsupported_options array with index less than the warning_idx, 1332 // vm will exit with an error message. Otherwise, it will result in a warning message. 1333 uint warning_idx = 2; 1334 SystemProperty* sp = system_properties(); 1335 while (sp != NULL) { 1336 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1337 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1338 if (i < warning_idx) { 1339 vm_exit_during_initialization( 1340 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1341 } else { 1342 warning( 1343 "the %s option is ignored when dumping the shared archive", unsupported_options[i]); 1344 } 1345 } 1346 } 1347 sp = sp->next(); 1348 } 1349 1350 // Check for an exploded module build in use with -Xshare:dump. 1351 if (!has_jimage()) { 1352 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1353 } 1354 } 1355 #endif 1356 1357 //=========================================================================================================== 1358 // Setting int/mixed/comp mode flags 1359 1360 void Arguments::set_mode_flags(Mode mode) { 1361 // Set up default values for all flags. 1362 // If you add a flag to any of the branches below, 1363 // add a default value for it here. 1364 set_java_compiler(false); 1365 _mode = mode; 1366 1367 // Ensure Agent_OnLoad has the correct initial values. 1368 // This may not be the final mode; mode may change later in onload phase. 1369 PropertyList_unique_add(&_system_properties, "java.vm.info", 1370 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1371 1372 UseInterpreter = true; 1373 UseCompiler = true; 1374 UseLoopCounter = true; 1375 1376 // Default values may be platform/compiler dependent - 1377 // use the saved values 1378 ClipInlining = Arguments::_ClipInlining; 1379 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1380 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1381 BackgroundCompilation = Arguments::_BackgroundCompilation; 1382 if (TieredCompilation) { 1383 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1384 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1385 } 1386 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1387 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1388 } 1389 } 1390 1391 // Change from defaults based on mode 1392 switch (mode) { 1393 default: 1394 ShouldNotReachHere(); 1395 break; 1396 case _int: 1397 UseCompiler = false; 1398 UseLoopCounter = false; 1399 AlwaysCompileLoopMethods = false; 1400 UseOnStackReplacement = false; 1401 break; 1402 case _mixed: 1403 // same as default 1404 break; 1405 case _comp: 1406 UseInterpreter = false; 1407 BackgroundCompilation = false; 1408 ClipInlining = false; 1409 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1410 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1411 // compile a level 4 (C2) and then continue executing it. 1412 if (TieredCompilation) { 1413 Tier3InvokeNotifyFreqLog = 0; 1414 Tier4InvocationThreshold = 0; 1415 } 1416 break; 1417 } 1418 } 1419 1420 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS 1421 // Conflict: required to use shared spaces (-Xshare:on), but 1422 // incompatible command line options were chosen. 1423 1424 static void no_shared_spaces(const char* message) { 1425 if (RequireSharedSpaces) { 1426 jio_fprintf(defaultStream::error_stream(), 1427 "Class data sharing is inconsistent with other specified options.\n"); 1428 vm_exit_during_initialization("Unable to use shared archive.", message); 1429 } else { 1430 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1431 } 1432 } 1433 #endif 1434 1435 // Returns threshold scaled with the value of scale. 1436 // If scale < 0.0, threshold is returned without scaling. 1437 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1438 if (scale == 1.0 || scale < 0.0) { 1439 return threshold; 1440 } else { 1441 return (intx)(threshold * scale); 1442 } 1443 } 1444 1445 // Returns freq_log scaled with the value of scale. 1446 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1447 // If scale < 0.0, freq_log is returned without scaling. 1448 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1449 // Check if scaling is necessary or if negative value was specified. 1450 if (scale == 1.0 || scale < 0.0) { 1451 return freq_log; 1452 } 1453 // Check values to avoid calculating log2 of 0. 1454 if (scale == 0.0 || freq_log == 0) { 1455 return 0; 1456 } 1457 // Determine the maximum notification frequency value currently supported. 1458 // The largest mask value that the interpreter/C1 can handle is 1459 // of length InvocationCounter::number_of_count_bits. Mask values are always 1460 // one bit shorter then the value of the notification frequency. Set 1461 // max_freq_bits accordingly. 1462 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1463 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1464 if (scaled_freq == 0) { 1465 // Return 0 right away to avoid calculating log2 of 0. 1466 return 0; 1467 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1468 return max_freq_bits; 1469 } else { 1470 return log2_intptr(scaled_freq); 1471 } 1472 } 1473 1474 void Arguments::set_tiered_flags() { 1475 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1476 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1477 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1478 } 1479 if (CompilationPolicyChoice < 2) { 1480 vm_exit_during_initialization( 1481 "Incompatible compilation policy selected", NULL); 1482 } 1483 // Increase the code cache size - tiered compiles a lot more. 1484 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1485 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1486 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1487 } 1488 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1489 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1490 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1491 } 1492 if (!UseInterpreter) { // -Xcomp 1493 Tier3InvokeNotifyFreqLog = 0; 1494 Tier4InvocationThreshold = 0; 1495 } 1496 1497 if (CompileThresholdScaling < 0) { 1498 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1499 } 1500 1501 // Scale tiered compilation thresholds. 1502 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1503 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1504 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1505 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1506 1507 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1508 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1509 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1510 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1511 1512 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1513 // once these thresholds become supported. 1514 1515 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1516 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1517 1518 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1519 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1520 1521 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1522 1523 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1524 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1525 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1526 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1527 } 1528 } 1529 1530 #if INCLUDE_ALL_GCS 1531 static void disable_adaptive_size_policy(const char* collector_name) { 1532 if (UseAdaptiveSizePolicy) { 1533 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1534 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1535 collector_name); 1536 } 1537 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1538 } 1539 } 1540 1541 void Arguments::set_parnew_gc_flags() { 1542 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1543 "control point invariant"); 1544 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1545 assert(UseParNewGC, "ParNew should always be used with CMS"); 1546 1547 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1548 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1549 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1550 } else if (ParallelGCThreads == 0) { 1551 jio_fprintf(defaultStream::error_stream(), 1552 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1553 vm_exit(1); 1554 } 1555 1556 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1557 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1558 // we set them to 1024 and 1024. 1559 // See CR 6362902. 1560 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1561 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1562 } 1563 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1564 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1565 } 1566 1567 // When using compressed oops, we use local overflow stacks, 1568 // rather than using a global overflow list chained through 1569 // the klass word of the object's pre-image. 1570 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1571 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1572 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1573 } 1574 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1575 } 1576 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1577 } 1578 1579 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1580 // sparc/solaris for certain applications, but would gain from 1581 // further optimization and tuning efforts, and would almost 1582 // certainly gain from analysis of platform and environment. 1583 void Arguments::set_cms_and_parnew_gc_flags() { 1584 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1585 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1586 assert(UseParNewGC, "ParNew should always be used with CMS"); 1587 1588 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1589 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1590 1591 set_parnew_gc_flags(); 1592 1593 size_t max_heap = align_size_down(MaxHeapSize, 1594 CardTableRS::ct_max_alignment_constraint()); 1595 1596 // Now make adjustments for CMS 1597 intx tenuring_default = (intx)6; 1598 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1599 1600 // Preferred young gen size for "short" pauses: 1601 // upper bound depends on # of threads and NewRatio. 1602 const size_t preferred_max_new_size_unaligned = 1603 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1604 size_t preferred_max_new_size = 1605 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1606 1607 // Unless explicitly requested otherwise, size young gen 1608 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1609 1610 // If either MaxNewSize or NewRatio is set on the command line, 1611 // assume the user is trying to set the size of the young gen. 1612 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1613 1614 // Set MaxNewSize to our calculated preferred_max_new_size unless 1615 // NewSize was set on the command line and it is larger than 1616 // preferred_max_new_size. 1617 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1618 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1619 } else { 1620 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1621 } 1622 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1623 1624 // Code along this path potentially sets NewSize and OldSize 1625 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1626 min_heap_size(), InitialHeapSize, max_heap); 1627 size_t min_new = preferred_max_new_size; 1628 if (FLAG_IS_CMDLINE(NewSize)) { 1629 min_new = NewSize; 1630 } 1631 if (max_heap > min_new && min_heap_size() > min_new) { 1632 // Unless explicitly requested otherwise, make young gen 1633 // at least min_new, and at most preferred_max_new_size. 1634 if (FLAG_IS_DEFAULT(NewSize)) { 1635 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1636 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1637 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1638 } 1639 // Unless explicitly requested otherwise, size old gen 1640 // so it's NewRatio x of NewSize. 1641 if (FLAG_IS_DEFAULT(OldSize)) { 1642 if (max_heap > NewSize) { 1643 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1644 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1645 } 1646 } 1647 } 1648 } 1649 // Unless explicitly requested otherwise, definitely 1650 // promote all objects surviving "tenuring_default" scavenges. 1651 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1652 FLAG_IS_DEFAULT(SurvivorRatio)) { 1653 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1654 } 1655 // If we decided above (or user explicitly requested) 1656 // `promote all' (via MaxTenuringThreshold := 0), 1657 // prefer minuscule survivor spaces so as not to waste 1658 // space for (non-existent) survivors 1659 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1660 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1661 } 1662 1663 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1664 // but rather the number of free blocks of a given size that are used when 1665 // replenishing the local per-worker free list caches. 1666 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1667 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1668 // OldPLAB sizing manually turned off: Use a larger default setting, 1669 // unless it was manually specified. This is because a too-low value 1670 // will slow down scavenges. 1671 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1672 } else { 1673 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1674 } 1675 } 1676 1677 // If either of the static initialization defaults have changed, note this 1678 // modification. 1679 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1680 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1681 } 1682 1683 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1684 } 1685 #endif // INCLUDE_ALL_GCS 1686 1687 void set_object_alignment() { 1688 // Object alignment. 1689 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1690 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1691 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1692 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1693 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1694 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1695 1696 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1697 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1698 1699 // Oop encoding heap max 1700 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1701 1702 if (SurvivorAlignmentInBytes == 0) { 1703 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1704 } 1705 1706 #if INCLUDE_ALL_GCS 1707 // Set CMS global values 1708 CompactibleFreeListSpace::set_cms_values(); 1709 #endif // INCLUDE_ALL_GCS 1710 } 1711 1712 size_t Arguments::max_heap_for_compressed_oops() { 1713 // Avoid sign flip. 1714 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1715 // We need to fit both the NULL page and the heap into the memory budget, while 1716 // keeping alignment constraints of the heap. To guarantee the latter, as the 1717 // NULL page is located before the heap, we pad the NULL page to the conservative 1718 // maximum alignment that the GC may ever impose upon the heap. 1719 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1720 _conservative_max_heap_alignment); 1721 1722 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1723 NOT_LP64(ShouldNotReachHere(); return 0); 1724 } 1725 1726 bool Arguments::should_auto_select_low_pause_collector() { 1727 if (UseAutoGCSelectPolicy && 1728 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1729 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1730 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1731 return true; 1732 } 1733 return false; 1734 } 1735 1736 void Arguments::set_use_compressed_oops() { 1737 #ifndef ZERO 1738 #ifdef _LP64 1739 // MaxHeapSize is not set up properly at this point, but 1740 // the only value that can override MaxHeapSize if we are 1741 // to use UseCompressedOops is InitialHeapSize. 1742 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1743 1744 if (max_heap_size <= max_heap_for_compressed_oops()) { 1745 #if !defined(COMPILER1) || defined(TIERED) 1746 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1747 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1748 } 1749 #endif 1750 } else { 1751 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1752 warning("Max heap size too large for Compressed Oops"); 1753 FLAG_SET_DEFAULT(UseCompressedOops, false); 1754 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1755 } 1756 } 1757 #endif // _LP64 1758 #endif // ZERO 1759 } 1760 1761 1762 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1763 // set_use_compressed_oops(). 1764 void Arguments::set_use_compressed_klass_ptrs() { 1765 #ifndef ZERO 1766 #ifdef _LP64 1767 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1768 if (!UseCompressedOops) { 1769 if (UseCompressedClassPointers) { 1770 warning("UseCompressedClassPointers requires UseCompressedOops"); 1771 } 1772 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1773 } else { 1774 // Turn on UseCompressedClassPointers too 1775 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1776 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1777 } 1778 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1779 if (UseCompressedClassPointers) { 1780 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1781 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1782 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1783 } 1784 } 1785 } 1786 #endif // _LP64 1787 #endif // !ZERO 1788 } 1789 1790 void Arguments::set_conservative_max_heap_alignment() { 1791 // The conservative maximum required alignment for the heap is the maximum of 1792 // the alignments imposed by several sources: any requirements from the heap 1793 // itself, the collector policy and the maximum page size we may run the VM 1794 // with. 1795 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1796 #if INCLUDE_ALL_GCS 1797 if (UseParallelGC) { 1798 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1799 } else if (UseG1GC) { 1800 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1801 } 1802 #endif // INCLUDE_ALL_GCS 1803 _conservative_max_heap_alignment = MAX4(heap_alignment, 1804 (size_t)os::vm_allocation_granularity(), 1805 os::max_page_size(), 1806 CollectorPolicy::compute_heap_alignment()); 1807 } 1808 1809 bool Arguments::gc_selected() { 1810 #if INCLUDE_ALL_GCS 1811 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1812 #else 1813 return UseSerialGC; 1814 #endif // INCLUDE_ALL_GCS 1815 } 1816 1817 void Arguments::select_gc_ergonomically() { 1818 #if INCLUDE_ALL_GCS 1819 if (os::is_server_class_machine()) { 1820 if (!UseAutoGCSelectPolicy) { 1821 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1822 } else { 1823 if (should_auto_select_low_pause_collector()) { 1824 FLAG_SET_ERGO_IF_DEFAULT(bool, UseConcMarkSweepGC, true); 1825 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParNewGC, true); 1826 } else { 1827 FLAG_SET_ERGO_IF_DEFAULT(bool, UseParallelGC, true); 1828 } 1829 } 1830 } else { 1831 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1832 } 1833 #else 1834 UNSUPPORTED_OPTION(UseG1GC); 1835 UNSUPPORTED_OPTION(UseParallelGC); 1836 UNSUPPORTED_OPTION(UseParallelOldGC); 1837 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1838 UNSUPPORTED_OPTION(UseParNewGC); 1839 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1840 #endif // INCLUDE_ALL_GCS 1841 } 1842 1843 void Arguments::select_gc() { 1844 if (!gc_selected()) { 1845 select_gc_ergonomically(); 1846 if (!gc_selected()) { 1847 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1848 } 1849 } 1850 } 1851 1852 void Arguments::set_ergonomics_flags() { 1853 select_gc(); 1854 1855 #if defined(COMPILER2) || INCLUDE_JVMCI 1856 // Shared spaces work fine with other GCs but causes bytecode rewriting 1857 // to be disabled, which hurts interpreter performance and decreases 1858 // server performance. When -server is specified, keep the default off 1859 // unless it is asked for. Future work: either add bytecode rewriting 1860 // at link time, or rewrite bytecodes in non-shared methods. 1861 if (!DumpSharedSpaces && !RequireSharedSpaces && 1862 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1863 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1864 } 1865 #endif 1866 1867 set_conservative_max_heap_alignment(); 1868 1869 #ifndef ZERO 1870 #ifdef _LP64 1871 set_use_compressed_oops(); 1872 1873 // set_use_compressed_klass_ptrs() must be called after calling 1874 // set_use_compressed_oops(). 1875 set_use_compressed_klass_ptrs(); 1876 1877 // Also checks that certain machines are slower with compressed oops 1878 // in vm_version initialization code. 1879 #endif // _LP64 1880 #endif // !ZERO 1881 1882 CodeCacheExtensions::set_ergonomics_flags(); 1883 } 1884 1885 void Arguments::set_parallel_gc_flags() { 1886 assert(UseParallelGC || UseParallelOldGC, "Error"); 1887 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1888 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1889 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1890 } 1891 FLAG_SET_DEFAULT(UseParallelGC, true); 1892 1893 // If no heap maximum was requested explicitly, use some reasonable fraction 1894 // of the physical memory, up to a maximum of 1GB. 1895 FLAG_SET_DEFAULT(ParallelGCThreads, 1896 Abstract_VM_Version::parallel_worker_threads()); 1897 if (ParallelGCThreads == 0) { 1898 jio_fprintf(defaultStream::error_stream(), 1899 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1900 vm_exit(1); 1901 } 1902 1903 if (UseAdaptiveSizePolicy) { 1904 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1905 // unless the user actually sets these flags. 1906 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1907 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1908 } 1909 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1910 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1911 } 1912 } 1913 1914 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1915 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1916 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1917 // See CR 6362902 for details. 1918 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1919 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1920 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1921 } 1922 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1923 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1924 } 1925 } 1926 1927 if (UseParallelOldGC) { 1928 // Par compact uses lower default values since they are treated as 1929 // minimums. These are different defaults because of the different 1930 // interpretation and are not ergonomically set. 1931 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1932 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1933 } 1934 } 1935 } 1936 1937 void Arguments::set_g1_gc_flags() { 1938 assert(UseG1GC, "Error"); 1939 #if defined(COMPILER1) || INCLUDE_JVMCI 1940 FastTLABRefill = false; 1941 #endif 1942 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1943 if (ParallelGCThreads == 0) { 1944 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1945 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1946 } 1947 1948 #if INCLUDE_ALL_GCS 1949 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1950 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1951 } 1952 #endif 1953 1954 // MarkStackSize will be set (if it hasn't been set by the user) 1955 // when concurrent marking is initialized. 1956 // Its value will be based upon the number of parallel marking threads. 1957 // But we do set the maximum mark stack size here. 1958 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1959 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1960 } 1961 1962 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1963 // In G1, we want the default GC overhead goal to be higher than 1964 // it is for PS, or the heap might be expanded too aggressively. 1965 // We set it here to ~8%. 1966 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1967 } 1968 1969 // Below, we might need to calculate the pause time interval based on 1970 // the pause target. When we do so we are going to give G1 maximum 1971 // flexibility and allow it to do pauses when it needs to. So, we'll 1972 // arrange that the pause interval to be pause time target + 1 to 1973 // ensure that a) the pause time target is maximized with respect to 1974 // the pause interval and b) we maintain the invariant that pause 1975 // time target < pause interval. If the user does not want this 1976 // maximum flexibility, they will have to set the pause interval 1977 // explicitly. 1978 1979 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1980 // The default pause time target in G1 is 200ms 1981 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1982 } 1983 1984 // Then, if the interval parameter was not set, set it according to 1985 // the pause time target (this will also deal with the case when the 1986 // pause time target is the default value). 1987 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1988 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1989 } 1990 1991 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1992 } 1993 1994 void Arguments::set_gc_specific_flags() { 1995 #if INCLUDE_ALL_GCS 1996 // Set per-collector flags 1997 if (UseParallelGC || UseParallelOldGC) { 1998 set_parallel_gc_flags(); 1999 } else if (UseConcMarkSweepGC) { 2000 set_cms_and_parnew_gc_flags(); 2001 } else if (UseG1GC) { 2002 set_g1_gc_flags(); 2003 } 2004 if (AssumeMP && !UseSerialGC) { 2005 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2006 warning("If the number of processors is expected to increase from one, then" 2007 " you should configure the number of parallel GC threads appropriately" 2008 " using -XX:ParallelGCThreads=N"); 2009 } 2010 } 2011 if (MinHeapFreeRatio == 100) { 2012 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2013 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2014 } 2015 2016 // If class unloading is disabled, also disable concurrent class unloading. 2017 if (!ClassUnloading) { 2018 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2019 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2020 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 2021 } 2022 #endif // INCLUDE_ALL_GCS 2023 } 2024 2025 julong Arguments::limit_by_allocatable_memory(julong limit) { 2026 julong max_allocatable; 2027 julong result = limit; 2028 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2029 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2030 } 2031 return result; 2032 } 2033 2034 // Use static initialization to get the default before parsing 2035 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2036 2037 void Arguments::set_heap_size() { 2038 julong phys_mem = 2039 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2040 : (julong)MaxRAM; 2041 2042 // Experimental support for CGroup memory limits 2043 if (UseCGroupMemoryLimitForHeap) { 2044 // This is a rough indicator that a CGroup limit may be in force 2045 // for this process 2046 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 2047 FILE *fp = fopen(lim_file, "r"); 2048 if (fp != NULL) { 2049 julong cgroup_max = 0; 2050 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2051 if (ret == 1 && cgroup_max > 0) { 2052 // If unlimited, cgroup_max will be a very large, but unspecified 2053 // value, so use initial phys_mem as a limit 2054 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2055 JULONG_FORMAT "MB) and initial phys_mem (" 2056 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2057 phys_mem = MIN2(cgroup_max, phys_mem); 2058 } else { 2059 warning("Unable to read/parse cgroup memory limit from %s: %s", 2060 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2061 } 2062 fclose(fp); 2063 } else { 2064 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2065 } 2066 } 2067 2068 // If the maximum heap size has not been set with -Xmx, 2069 // then set it as fraction of the size of physical memory, 2070 // respecting the maximum and minimum sizes of the heap. 2071 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2072 julong reasonable_max = phys_mem / MaxRAMFraction; 2073 2074 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2075 // Small physical memory, so use a minimum fraction of it for the heap 2076 reasonable_max = phys_mem / MinRAMFraction; 2077 } else { 2078 // Not-small physical memory, so require a heap at least 2079 // as large as MaxHeapSize 2080 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2081 } 2082 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2083 // Limit the heap size to ErgoHeapSizeLimit 2084 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2085 } 2086 if (UseCompressedOops) { 2087 // Limit the heap size to the maximum possible when using compressed oops 2088 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2089 2090 // HeapBaseMinAddress can be greater than default but not less than. 2091 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2092 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2093 // matches compressed oops printing flags 2094 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2095 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2096 DefaultHeapBaseMinAddress, 2097 DefaultHeapBaseMinAddress/G, 2098 HeapBaseMinAddress); 2099 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2100 } 2101 } 2102 2103 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2104 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2105 // but it should be not less than default MaxHeapSize. 2106 max_coop_heap -= HeapBaseMinAddress; 2107 } 2108 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2109 } 2110 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2111 2112 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2113 // An initial heap size was specified on the command line, 2114 // so be sure that the maximum size is consistent. Done 2115 // after call to limit_by_allocatable_memory because that 2116 // method might reduce the allocation size. 2117 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2118 } 2119 2120 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2121 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2122 } 2123 2124 // If the minimum or initial heap_size have not been set or requested to be set 2125 // ergonomically, set them accordingly. 2126 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2127 julong reasonable_minimum = (julong)(OldSize + NewSize); 2128 2129 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2130 2131 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2132 2133 if (InitialHeapSize == 0) { 2134 julong reasonable_initial = phys_mem / InitialRAMFraction; 2135 2136 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2137 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2138 2139 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2140 2141 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2142 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2143 } 2144 // If the minimum heap size has not been set (via -Xms), 2145 // synchronize with InitialHeapSize to avoid errors with the default value. 2146 if (min_heap_size() == 0) { 2147 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2148 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2149 } 2150 } 2151 } 2152 2153 // This option inspects the machine and attempts to set various 2154 // parameters to be optimal for long-running, memory allocation 2155 // intensive jobs. It is intended for machines with large 2156 // amounts of cpu and memory. 2157 jint Arguments::set_aggressive_heap_flags() { 2158 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2159 // VM, but we may not be able to represent the total physical memory 2160 // available (like having 8gb of memory on a box but using a 32bit VM). 2161 // Thus, we need to make sure we're using a julong for intermediate 2162 // calculations. 2163 julong initHeapSize; 2164 julong total_memory = os::physical_memory(); 2165 2166 if (total_memory < (julong) 256 * M) { 2167 jio_fprintf(defaultStream::error_stream(), 2168 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2169 vm_exit(1); 2170 } 2171 2172 // The heap size is half of available memory, or (at most) 2173 // all of possible memory less 160mb (leaving room for the OS 2174 // when using ISM). This is the maximum; because adaptive sizing 2175 // is turned on below, the actual space used may be smaller. 2176 2177 initHeapSize = MIN2(total_memory / (julong) 2, 2178 total_memory - (julong) 160 * M); 2179 2180 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2181 2182 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2183 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2184 return JNI_EINVAL; 2185 } 2186 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2187 return JNI_EINVAL; 2188 } 2189 // Currently the minimum size and the initial heap sizes are the same. 2190 set_min_heap_size(initHeapSize); 2191 } 2192 if (FLAG_IS_DEFAULT(NewSize)) { 2193 // Make the young generation 3/8ths of the total heap. 2194 if (FLAG_SET_CMDLINE(size_t, NewSize, 2195 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2196 return JNI_EINVAL; 2197 } 2198 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2199 return JNI_EINVAL; 2200 } 2201 } 2202 2203 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2204 FLAG_SET_DEFAULT(UseLargePages, true); 2205 #endif 2206 2207 // Increase some data structure sizes for efficiency 2208 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2209 return JNI_EINVAL; 2210 } 2211 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2212 return JNI_EINVAL; 2213 } 2214 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2215 return JNI_EINVAL; 2216 } 2217 2218 // See the OldPLABSize comment below, but replace 'after promotion' 2219 // with 'after copying'. YoungPLABSize is the size of the survivor 2220 // space per-gc-thread buffers. The default is 4kw. 2221 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2222 return JNI_EINVAL; 2223 } 2224 2225 // OldPLABSize is the size of the buffers in the old gen that 2226 // UseParallelGC uses to promote live data that doesn't fit in the 2227 // survivor spaces. At any given time, there's one for each gc thread. 2228 // The default size is 1kw. These buffers are rarely used, since the 2229 // survivor spaces are usually big enough. For specjbb, however, there 2230 // are occasions when there's lots of live data in the young gen 2231 // and we end up promoting some of it. We don't have a definite 2232 // explanation for why bumping OldPLABSize helps, but the theory 2233 // is that a bigger PLAB results in retaining something like the 2234 // original allocation order after promotion, which improves mutator 2235 // locality. A minor effect may be that larger PLABs reduce the 2236 // number of PLAB allocation events during gc. The value of 8kw 2237 // was arrived at by experimenting with specjbb. 2238 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2239 return JNI_EINVAL; 2240 } 2241 2242 // Enable parallel GC and adaptive generation sizing 2243 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2244 return JNI_EINVAL; 2245 } 2246 FLAG_SET_DEFAULT(ParallelGCThreads, 2247 Abstract_VM_Version::parallel_worker_threads()); 2248 2249 // Encourage steady state memory management 2250 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2251 return JNI_EINVAL; 2252 } 2253 2254 // This appears to improve mutator locality 2255 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2256 return JNI_EINVAL; 2257 } 2258 2259 // Get around early Solaris scheduling bug 2260 // (affinity vs other jobs on system) 2261 // but disallow DR and offlining (5008695). 2262 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2263 return JNI_EINVAL; 2264 } 2265 2266 return JNI_OK; 2267 } 2268 2269 // This must be called after ergonomics. 2270 void Arguments::set_bytecode_flags() { 2271 if (!RewriteBytecodes) { 2272 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2273 } 2274 } 2275 2276 // Aggressive optimization flags -XX:+AggressiveOpts 2277 jint Arguments::set_aggressive_opts_flags() { 2278 #ifdef COMPILER2 2279 if (AggressiveUnboxing) { 2280 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2281 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2282 } else if (!EliminateAutoBox) { 2283 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2284 AggressiveUnboxing = false; 2285 } 2286 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2287 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2288 } else if (!DoEscapeAnalysis) { 2289 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2290 AggressiveUnboxing = false; 2291 } 2292 } 2293 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2294 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2295 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2296 } 2297 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2298 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2299 } 2300 2301 // Feed the cache size setting into the JDK 2302 char buffer[1024]; 2303 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2304 if (!add_property(buffer)) { 2305 return JNI_ENOMEM; 2306 } 2307 } 2308 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2309 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2310 } 2311 #endif 2312 2313 if (AggressiveOpts) { 2314 // Sample flag setting code 2315 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2316 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2317 // } 2318 } 2319 2320 return JNI_OK; 2321 } 2322 2323 //=========================================================================================================== 2324 // Parsing of java.compiler property 2325 2326 void Arguments::process_java_compiler_argument(const char* arg) { 2327 // For backwards compatibility, Djava.compiler=NONE or "" 2328 // causes us to switch to -Xint mode UNLESS -Xdebug 2329 // is also specified. 2330 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2331 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2332 } 2333 } 2334 2335 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2336 _sun_java_launcher = os::strdup_check_oom(launcher); 2337 } 2338 2339 bool Arguments::created_by_java_launcher() { 2340 assert(_sun_java_launcher != NULL, "property must have value"); 2341 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2342 } 2343 2344 bool Arguments::sun_java_launcher_is_altjvm() { 2345 return _sun_java_launcher_is_altjvm; 2346 } 2347 2348 //=========================================================================================================== 2349 // Parsing of main arguments 2350 2351 #if INCLUDE_JVMCI 2352 // Check consistency of jvmci vm argument settings. 2353 bool Arguments::check_jvmci_args_consistency() { 2354 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2355 } 2356 #endif //INCLUDE_JVMCI 2357 2358 // Check consistency of GC selection 2359 bool Arguments::check_gc_consistency() { 2360 // Ensure that the user has not selected conflicting sets 2361 // of collectors. 2362 uint i = 0; 2363 if (UseSerialGC) i++; 2364 if (UseConcMarkSweepGC) i++; 2365 if (UseParallelGC || UseParallelOldGC) i++; 2366 if (UseG1GC) i++; 2367 if (i > 1) { 2368 jio_fprintf(defaultStream::error_stream(), 2369 "Conflicting collector combinations in option list; " 2370 "please refer to the release notes for the combinations " 2371 "allowed\n"); 2372 return false; 2373 } 2374 2375 if (UseConcMarkSweepGC && !UseParNewGC) { 2376 jio_fprintf(defaultStream::error_stream(), 2377 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2378 return false; 2379 } 2380 2381 if (UseParNewGC && !UseConcMarkSweepGC) { 2382 jio_fprintf(defaultStream::error_stream(), 2383 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2384 return false; 2385 } 2386 2387 return true; 2388 } 2389 2390 // Check the consistency of vm_init_args 2391 bool Arguments::check_vm_args_consistency() { 2392 // Method for adding checks for flag consistency. 2393 // The intent is to warn the user of all possible conflicts, 2394 // before returning an error. 2395 // Note: Needs platform-dependent factoring. 2396 bool status = true; 2397 2398 if (TLABRefillWasteFraction == 0) { 2399 jio_fprintf(defaultStream::error_stream(), 2400 "TLABRefillWasteFraction should be a denominator, " 2401 "not " SIZE_FORMAT "\n", 2402 TLABRefillWasteFraction); 2403 status = false; 2404 } 2405 2406 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2407 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2408 } 2409 2410 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2411 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2412 } 2413 2414 if (GCTimeLimit == 100) { 2415 // Turn off gc-overhead-limit-exceeded checks 2416 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2417 } 2418 2419 status = status && check_gc_consistency(); 2420 2421 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2422 // insists that we hold the requisite locks so that the iteration is 2423 // MT-safe. For the verification at start-up and shut-down, we don't 2424 // yet have a good way of acquiring and releasing these locks, 2425 // which are not visible at the CollectedHeap level. We want to 2426 // be able to acquire these locks and then do the iteration rather 2427 // than just disable the lock verification. This will be fixed under 2428 // bug 4788986. 2429 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2430 if (VerifyDuringStartup) { 2431 warning("Heap verification at start-up disabled " 2432 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2433 VerifyDuringStartup = false; // Disable verification at start-up 2434 } 2435 2436 if (VerifyBeforeExit) { 2437 warning("Heap verification at shutdown disabled " 2438 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2439 VerifyBeforeExit = false; // Disable verification at shutdown 2440 } 2441 } 2442 2443 if (PrintNMTStatistics) { 2444 #if INCLUDE_NMT 2445 if (MemTracker::tracking_level() == NMT_off) { 2446 #endif // INCLUDE_NMT 2447 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2448 PrintNMTStatistics = false; 2449 #if INCLUDE_NMT 2450 } 2451 #endif 2452 } 2453 #if INCLUDE_JVMCI 2454 2455 status = status && check_jvmci_args_consistency(); 2456 2457 if (EnableJVMCI) { 2458 if (!ScavengeRootsInCode) { 2459 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2460 ScavengeRootsInCode = 1; 2461 } 2462 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2463 TypeProfileLevel = 0; 2464 } 2465 if (UseJVMCICompiler) { 2466 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2467 TypeProfileWidth = 8; 2468 } 2469 } 2470 } 2471 #endif 2472 2473 // Check lower bounds of the code cache 2474 // Template Interpreter code is approximately 3X larger in debug builds. 2475 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2476 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2477 jio_fprintf(defaultStream::error_stream(), 2478 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2479 os::vm_page_size()/K); 2480 status = false; 2481 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2482 jio_fprintf(defaultStream::error_stream(), 2483 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2484 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2485 status = false; 2486 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2487 jio_fprintf(defaultStream::error_stream(), 2488 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2489 min_code_cache_size/K); 2490 status = false; 2491 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2492 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2493 jio_fprintf(defaultStream::error_stream(), 2494 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2495 CODE_CACHE_SIZE_LIMIT/M); 2496 status = false; 2497 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2498 jio_fprintf(defaultStream::error_stream(), 2499 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2500 min_code_cache_size/K); 2501 status = false; 2502 } 2503 2504 #ifdef _LP64 2505 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2506 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2507 } 2508 #endif 2509 2510 #ifndef SUPPORT_RESERVED_STACK_AREA 2511 if (StackReservedPages != 0) { 2512 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2513 warning("Reserved Stack Area not supported on this platform"); 2514 } 2515 #endif 2516 2517 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2518 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2519 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2520 } 2521 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2522 } 2523 if (UseCompiler && is_interpreter_only()) { 2524 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2525 warning("UseCompiler disabled due to -Xint."); 2526 } 2527 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2528 } 2529 #ifdef COMPILER2 2530 if (PostLoopMultiversioning && !RangeCheckElimination) { 2531 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2532 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2533 } 2534 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2535 } 2536 #endif 2537 return status; 2538 } 2539 2540 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2541 const char* option_type) { 2542 if (ignore) return false; 2543 2544 const char* spacer = " "; 2545 if (option_type == NULL) { 2546 option_type = ++spacer; // Set both to the empty string. 2547 } 2548 2549 if (os::obsolete_option(option)) { 2550 jio_fprintf(defaultStream::error_stream(), 2551 "Obsolete %s%soption: %s\n", option_type, spacer, 2552 option->optionString); 2553 return false; 2554 } else { 2555 jio_fprintf(defaultStream::error_stream(), 2556 "Unrecognized %s%soption: %s\n", option_type, spacer, 2557 option->optionString); 2558 return true; 2559 } 2560 } 2561 2562 static const char* user_assertion_options[] = { 2563 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2564 }; 2565 2566 static const char* system_assertion_options[] = { 2567 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2568 }; 2569 2570 bool Arguments::parse_uintx(const char* value, 2571 uintx* uintx_arg, 2572 uintx min_size) { 2573 2574 // Check the sign first since atojulong() parses only unsigned values. 2575 bool value_is_positive = !(*value == '-'); 2576 2577 if (value_is_positive) { 2578 julong n; 2579 bool good_return = atojulong(value, &n); 2580 if (good_return) { 2581 bool above_minimum = n >= min_size; 2582 bool value_is_too_large = n > max_uintx; 2583 2584 if (above_minimum && !value_is_too_large) { 2585 *uintx_arg = n; 2586 return true; 2587 } 2588 } 2589 } 2590 return false; 2591 } 2592 2593 unsigned int addreads_count = 0; 2594 unsigned int addexports_count = 0; 2595 unsigned int addmods_count = 0; 2596 unsigned int patch_mod_count = 0; 2597 2598 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2599 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2600 char* property = AllocateHeap(prop_len, mtArguments); 2601 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2602 if (ret < 0 || ret >= (int)prop_len) { 2603 FreeHeap(property); 2604 return false; 2605 } 2606 bool added = add_property(property, UnwriteableProperty, internal); 2607 FreeHeap(property); 2608 return added; 2609 } 2610 2611 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2612 // Make sure count is < 1,000. Otherwise, memory allocation will be too small. 2613 if (count < 1000) { 2614 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5; 2615 char* property = AllocateHeap(prop_len, mtArguments); 2616 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2617 if (ret < 0 || ret >= (int)prop_len) { 2618 FreeHeap(property); 2619 return false; 2620 } 2621 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2622 FreeHeap(property); 2623 return added; 2624 } 2625 return false; 2626 } 2627 2628 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2629 julong* long_arg, 2630 julong min_size) { 2631 if (!atojulong(s, long_arg)) return arg_unreadable; 2632 return check_memory_size(*long_arg, min_size); 2633 } 2634 2635 // Parse JavaVMInitArgs structure 2636 2637 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2638 const JavaVMInitArgs *java_options_args, 2639 const JavaVMInitArgs *cmd_line_args) { 2640 bool patch_mod_javabase = false; 2641 2642 // Save default settings for some mode flags 2643 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2644 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2645 Arguments::_ClipInlining = ClipInlining; 2646 Arguments::_BackgroundCompilation = BackgroundCompilation; 2647 if (TieredCompilation) { 2648 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2649 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2650 } 2651 2652 // Setup flags for mixed which is the default 2653 set_mode_flags(_mixed); 2654 2655 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2656 // variable (if present). 2657 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2658 if (result != JNI_OK) { 2659 return result; 2660 } 2661 2662 // Parse args structure generated from the command line flags. 2663 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2664 if (result != JNI_OK) { 2665 return result; 2666 } 2667 2668 // Parse args structure generated from the _JAVA_OPTIONS environment 2669 // variable (if present) (mimics classic VM) 2670 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2671 if (result != JNI_OK) { 2672 return result; 2673 } 2674 2675 // Do final processing now that all arguments have been parsed 2676 result = finalize_vm_init_args(); 2677 if (result != JNI_OK) { 2678 return result; 2679 } 2680 2681 return JNI_OK; 2682 } 2683 2684 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2685 // represents a valid JDWP agent. is_path==true denotes that we 2686 // are dealing with -agentpath (case where name is a path), otherwise with 2687 // -agentlib 2688 bool valid_jdwp_agent(char *name, bool is_path) { 2689 char *_name; 2690 const char *_jdwp = "jdwp"; 2691 size_t _len_jdwp, _len_prefix; 2692 2693 if (is_path) { 2694 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2695 return false; 2696 } 2697 2698 _name++; // skip past last path separator 2699 _len_prefix = strlen(JNI_LIB_PREFIX); 2700 2701 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2702 return false; 2703 } 2704 2705 _name += _len_prefix; 2706 _len_jdwp = strlen(_jdwp); 2707 2708 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2709 _name += _len_jdwp; 2710 } 2711 else { 2712 return false; 2713 } 2714 2715 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2716 return false; 2717 } 2718 2719 return true; 2720 } 2721 2722 if (strcmp(name, _jdwp) == 0) { 2723 return true; 2724 } 2725 2726 return false; 2727 } 2728 2729 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2730 // --patch-module=<module>=<file>(<pathsep><file>)* 2731 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2732 // Find the equal sign between the module name and the path specification 2733 const char* module_equal = strchr(patch_mod_tail, '='); 2734 if (module_equal == NULL) { 2735 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2736 return JNI_ERR; 2737 } else { 2738 // Pick out the module name 2739 size_t module_len = module_equal - patch_mod_tail; 2740 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2741 if (module_name != NULL) { 2742 memcpy(module_name, patch_mod_tail, module_len); 2743 *(module_name + module_len) = '\0'; 2744 // The path piece begins one past the module_equal sign 2745 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2746 FREE_C_HEAP_ARRAY(char, module_name); 2747 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2748 return JNI_ENOMEM; 2749 } 2750 } else { 2751 return JNI_ENOMEM; 2752 } 2753 } 2754 return JNI_OK; 2755 } 2756 2757 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2758 // For match_option to return remaining or value part of option string 2759 const char* tail; 2760 2761 // iterate over arguments 2762 for (int index = 0; index < args->nOptions; index++) { 2763 bool is_absolute_path = false; // for -agentpath vs -agentlib 2764 2765 const JavaVMOption* option = args->options + index; 2766 2767 if (!match_option(option, "-Djava.class.path", &tail) && 2768 !match_option(option, "-Dsun.java.command", &tail) && 2769 !match_option(option, "-Dsun.java.launcher", &tail)) { 2770 2771 // add all jvm options to the jvm_args string. This string 2772 // is used later to set the java.vm.args PerfData string constant. 2773 // the -Djava.class.path and the -Dsun.java.command options are 2774 // omitted from jvm_args string as each have their own PerfData 2775 // string constant object. 2776 build_jvm_args(option->optionString); 2777 } 2778 2779 // -verbose:[class/gc/jni] 2780 if (match_option(option, "-verbose", &tail)) { 2781 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2782 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2783 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2784 } else if (!strcmp(tail, ":gc")) { 2785 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2786 } else if (!strcmp(tail, ":jni")) { 2787 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2788 return JNI_EINVAL; 2789 } 2790 } 2791 // -da / -ea / -disableassertions / -enableassertions 2792 // These accept an optional class/package name separated by a colon, e.g., 2793 // -da:java.lang.Thread. 2794 } else if (match_option(option, user_assertion_options, &tail, true)) { 2795 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2796 if (*tail == '\0') { 2797 JavaAssertions::setUserClassDefault(enable); 2798 } else { 2799 assert(*tail == ':', "bogus match by match_option()"); 2800 JavaAssertions::addOption(tail + 1, enable); 2801 } 2802 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2803 } else if (match_option(option, system_assertion_options, &tail, false)) { 2804 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2805 JavaAssertions::setSystemClassDefault(enable); 2806 // -bootclasspath: 2807 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2808 jio_fprintf(defaultStream::output_stream(), 2809 "-Xbootclasspath is no longer a supported option.\n"); 2810 return JNI_EINVAL; 2811 // -bootclasspath/a: 2812 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2813 Arguments::append_sysclasspath(tail); 2814 // -bootclasspath/p: 2815 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2816 jio_fprintf(defaultStream::output_stream(), 2817 "-Xbootclasspath/p is no longer a supported option.\n"); 2818 return JNI_EINVAL; 2819 // -Xrun 2820 } else if (match_option(option, "-Xrun", &tail)) { 2821 if (tail != NULL) { 2822 const char* pos = strchr(tail, ':'); 2823 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2824 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2825 jio_snprintf(name, len + 1, "%s", tail); 2826 2827 char *options = NULL; 2828 if(pos != NULL) { 2829 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2830 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2831 } 2832 #if !INCLUDE_JVMTI 2833 if (strcmp(name, "jdwp") == 0) { 2834 jio_fprintf(defaultStream::error_stream(), 2835 "Debugging agents are not supported in this VM\n"); 2836 return JNI_ERR; 2837 } 2838 #endif // !INCLUDE_JVMTI 2839 add_init_library(name, options); 2840 } 2841 } else if (match_option(option, "--add-reads=", &tail)) { 2842 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2843 return JNI_ENOMEM; 2844 } 2845 } else if (match_option(option, "--add-exports=", &tail)) { 2846 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2847 return JNI_ENOMEM; 2848 } 2849 } else if (match_option(option, "--add-modules=", &tail)) { 2850 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2851 return JNI_ENOMEM; 2852 } 2853 } else if (match_option(option, "--limit-modules=", &tail)) { 2854 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2855 return JNI_ENOMEM; 2856 } 2857 } else if (match_option(option, "--module-path=", &tail)) { 2858 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2859 return JNI_ENOMEM; 2860 } 2861 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2862 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2863 return JNI_ENOMEM; 2864 } 2865 } else if (match_option(option, "--patch-module=", &tail)) { 2866 // --patch-module=<module>=<file>(<pathsep><file>)* 2867 int res = process_patch_mod_option(tail, patch_mod_javabase); 2868 if (res != JNI_OK) { 2869 return res; 2870 } 2871 // -agentlib and -agentpath 2872 } else if (match_option(option, "-agentlib:", &tail) || 2873 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2874 if(tail != NULL) { 2875 const char* pos = strchr(tail, '='); 2876 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2877 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2878 name[len] = '\0'; 2879 2880 char *options = NULL; 2881 if(pos != NULL) { 2882 options = os::strdup_check_oom(pos + 1, mtArguments); 2883 } 2884 #if !INCLUDE_JVMTI 2885 if (valid_jdwp_agent(name, is_absolute_path)) { 2886 jio_fprintf(defaultStream::error_stream(), 2887 "Debugging agents are not supported in this VM\n"); 2888 return JNI_ERR; 2889 } 2890 #endif // !INCLUDE_JVMTI 2891 add_init_agent(name, options, is_absolute_path); 2892 } 2893 // -javaagent 2894 } else if (match_option(option, "-javaagent:", &tail)) { 2895 #if !INCLUDE_JVMTI 2896 jio_fprintf(defaultStream::error_stream(), 2897 "Instrumentation agents are not supported in this VM\n"); 2898 return JNI_ERR; 2899 #else 2900 if (tail != NULL) { 2901 size_t length = strlen(tail) + 1; 2902 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2903 jio_snprintf(options, length, "%s", tail); 2904 add_init_agent("instrument", options, false); 2905 // java agents need module java.instrument 2906 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2907 return JNI_ENOMEM; 2908 } 2909 } 2910 #endif // !INCLUDE_JVMTI 2911 // -Xnoclassgc 2912 } else if (match_option(option, "-Xnoclassgc")) { 2913 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2914 return JNI_EINVAL; 2915 } 2916 // -Xconcgc 2917 } else if (match_option(option, "-Xconcgc")) { 2918 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2919 return JNI_EINVAL; 2920 } 2921 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2922 // -Xnoconcgc 2923 } else if (match_option(option, "-Xnoconcgc")) { 2924 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2925 return JNI_EINVAL; 2926 } 2927 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2928 // -Xbatch 2929 } else if (match_option(option, "-Xbatch")) { 2930 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2931 return JNI_EINVAL; 2932 } 2933 // -Xmn for compatibility with other JVM vendors 2934 } else if (match_option(option, "-Xmn", &tail)) { 2935 julong long_initial_young_size = 0; 2936 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2937 if (errcode != arg_in_range) { 2938 jio_fprintf(defaultStream::error_stream(), 2939 "Invalid initial young generation size: %s\n", option->optionString); 2940 describe_range_error(errcode); 2941 return JNI_EINVAL; 2942 } 2943 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2944 return JNI_EINVAL; 2945 } 2946 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2947 return JNI_EINVAL; 2948 } 2949 // -Xms 2950 } else if (match_option(option, "-Xms", &tail)) { 2951 julong long_initial_heap_size = 0; 2952 // an initial heap size of 0 means automatically determine 2953 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2954 if (errcode != arg_in_range) { 2955 jio_fprintf(defaultStream::error_stream(), 2956 "Invalid initial heap size: %s\n", option->optionString); 2957 describe_range_error(errcode); 2958 return JNI_EINVAL; 2959 } 2960 set_min_heap_size((size_t)long_initial_heap_size); 2961 // Currently the minimum size and the initial heap sizes are the same. 2962 // Can be overridden with -XX:InitialHeapSize. 2963 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2964 return JNI_EINVAL; 2965 } 2966 // -Xmx 2967 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2968 julong long_max_heap_size = 0; 2969 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2970 if (errcode != arg_in_range) { 2971 jio_fprintf(defaultStream::error_stream(), 2972 "Invalid maximum heap size: %s\n", option->optionString); 2973 describe_range_error(errcode); 2974 return JNI_EINVAL; 2975 } 2976 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2977 return JNI_EINVAL; 2978 } 2979 // Xmaxf 2980 } else if (match_option(option, "-Xmaxf", &tail)) { 2981 char* err; 2982 int maxf = (int)(strtod(tail, &err) * 100); 2983 if (*err != '\0' || *tail == '\0') { 2984 jio_fprintf(defaultStream::error_stream(), 2985 "Bad max heap free percentage size: %s\n", 2986 option->optionString); 2987 return JNI_EINVAL; 2988 } else { 2989 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2990 return JNI_EINVAL; 2991 } 2992 } 2993 // Xminf 2994 } else if (match_option(option, "-Xminf", &tail)) { 2995 char* err; 2996 int minf = (int)(strtod(tail, &err) * 100); 2997 if (*err != '\0' || *tail == '\0') { 2998 jio_fprintf(defaultStream::error_stream(), 2999 "Bad min heap free percentage size: %s\n", 3000 option->optionString); 3001 return JNI_EINVAL; 3002 } else { 3003 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 3004 return JNI_EINVAL; 3005 } 3006 } 3007 // -Xss 3008 } else if (match_option(option, "-Xss", &tail)) { 3009 julong long_ThreadStackSize = 0; 3010 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3011 if (errcode != arg_in_range) { 3012 jio_fprintf(defaultStream::error_stream(), 3013 "Invalid thread stack size: %s\n", option->optionString); 3014 describe_range_error(errcode); 3015 return JNI_EINVAL; 3016 } 3017 // Internally track ThreadStackSize in units of 1024 bytes. 3018 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 3019 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 3020 return JNI_EINVAL; 3021 } 3022 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 3023 } else if (match_option(option, "-Xoss", &tail) || 3024 match_option(option, "-Xsqnopause") || 3025 match_option(option, "-Xoptimize") || 3026 match_option(option, "-Xboundthreads") || 3027 match_option(option, "-Xusealtsigs")) { 3028 // All these options are deprecated in JDK 9 and will be removed in a future release 3029 char version[256]; 3030 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3031 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3032 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3033 julong long_CodeCacheExpansionSize = 0; 3034 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3035 if (errcode != arg_in_range) { 3036 jio_fprintf(defaultStream::error_stream(), 3037 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3038 os::vm_page_size()/K); 3039 return JNI_EINVAL; 3040 } 3041 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3042 return JNI_EINVAL; 3043 } 3044 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3045 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3046 julong long_ReservedCodeCacheSize = 0; 3047 3048 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3049 if (errcode != arg_in_range) { 3050 jio_fprintf(defaultStream::error_stream(), 3051 "Invalid maximum code cache size: %s.\n", option->optionString); 3052 return JNI_EINVAL; 3053 } 3054 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3055 return JNI_EINVAL; 3056 } 3057 // -XX:NonNMethodCodeHeapSize= 3058 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3059 julong long_NonNMethodCodeHeapSize = 0; 3060 3061 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3062 if (errcode != arg_in_range) { 3063 jio_fprintf(defaultStream::error_stream(), 3064 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3065 return JNI_EINVAL; 3066 } 3067 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3068 return JNI_EINVAL; 3069 } 3070 // -XX:ProfiledCodeHeapSize= 3071 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3072 julong long_ProfiledCodeHeapSize = 0; 3073 3074 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3075 if (errcode != arg_in_range) { 3076 jio_fprintf(defaultStream::error_stream(), 3077 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3078 return JNI_EINVAL; 3079 } 3080 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3081 return JNI_EINVAL; 3082 } 3083 // -XX:NonProfiledCodeHeapSizee= 3084 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3085 julong long_NonProfiledCodeHeapSize = 0; 3086 3087 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3088 if (errcode != arg_in_range) { 3089 jio_fprintf(defaultStream::error_stream(), 3090 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3091 return JNI_EINVAL; 3092 } 3093 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3094 return JNI_EINVAL; 3095 } 3096 // -green 3097 } else if (match_option(option, "-green")) { 3098 jio_fprintf(defaultStream::error_stream(), 3099 "Green threads support not available\n"); 3100 return JNI_EINVAL; 3101 // -native 3102 } else if (match_option(option, "-native")) { 3103 // HotSpot always uses native threads, ignore silently for compatibility 3104 // -Xrs 3105 } else if (match_option(option, "-Xrs")) { 3106 // Classic/EVM option, new functionality 3107 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3108 return JNI_EINVAL; 3109 } 3110 // -Xprof 3111 } else if (match_option(option, "-Xprof")) { 3112 #if INCLUDE_FPROF 3113 _has_profile = true; 3114 #else // INCLUDE_FPROF 3115 jio_fprintf(defaultStream::error_stream(), 3116 "Flat profiling is not supported in this VM.\n"); 3117 return JNI_ERR; 3118 #endif // INCLUDE_FPROF 3119 // -Xconcurrentio 3120 } else if (match_option(option, "-Xconcurrentio")) { 3121 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3122 return JNI_EINVAL; 3123 } 3124 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3125 return JNI_EINVAL; 3126 } 3127 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3128 return JNI_EINVAL; 3129 } 3130 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3131 return JNI_EINVAL; 3132 } 3133 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3134 return JNI_EINVAL; 3135 } 3136 3137 // -Xinternalversion 3138 } else if (match_option(option, "-Xinternalversion")) { 3139 jio_fprintf(defaultStream::output_stream(), "%s\n", 3140 VM_Version::internal_vm_info_string()); 3141 vm_exit(0); 3142 #ifndef PRODUCT 3143 // -Xprintflags 3144 } else if (match_option(option, "-Xprintflags")) { 3145 CommandLineFlags::printFlags(tty, false); 3146 vm_exit(0); 3147 #endif 3148 // -D 3149 } else if (match_option(option, "-D", &tail)) { 3150 const char* value; 3151 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3152 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3153 // abort if -Djava.endorsed.dirs is set 3154 jio_fprintf(defaultStream::output_stream(), 3155 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3156 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3157 return JNI_EINVAL; 3158 } 3159 if (match_option(option, "-Djava.ext.dirs=", &value) && 3160 *value != '\0' && strcmp(value, "\"\"") != 0) { 3161 // abort if -Djava.ext.dirs is set 3162 jio_fprintf(defaultStream::output_stream(), 3163 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3164 return JNI_EINVAL; 3165 } 3166 // Check for module related properties. They must be set using the modules 3167 // options. For example: use "--add-modules=java.sql", not 3168 // "-Djdk.module.addmods=java.sql" 3169 if (is_internal_module_property(option->optionString + 2)) { 3170 needs_module_property_warning = true; 3171 continue; 3172 } 3173 3174 if (!add_property(tail)) { 3175 return JNI_ENOMEM; 3176 } 3177 // Out of the box management support 3178 if (match_option(option, "-Dcom.sun.management", &tail)) { 3179 #if INCLUDE_MANAGEMENT 3180 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3181 return JNI_EINVAL; 3182 } 3183 // management agent in module java.management 3184 if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) { 3185 return JNI_ENOMEM; 3186 } 3187 #else 3188 jio_fprintf(defaultStream::output_stream(), 3189 "-Dcom.sun.management is not supported in this VM.\n"); 3190 return JNI_ERR; 3191 #endif 3192 } 3193 // -Xint 3194 } else if (match_option(option, "-Xint")) { 3195 set_mode_flags(_int); 3196 // -Xmixed 3197 } else if (match_option(option, "-Xmixed")) { 3198 set_mode_flags(_mixed); 3199 // -Xcomp 3200 } else if (match_option(option, "-Xcomp")) { 3201 // for testing the compiler; turn off all flags that inhibit compilation 3202 set_mode_flags(_comp); 3203 // -Xshare:dump 3204 } else if (match_option(option, "-Xshare:dump")) { 3205 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3206 return JNI_EINVAL; 3207 } 3208 set_mode_flags(_int); // Prevent compilation, which creates objects 3209 // -Xshare:on 3210 } else if (match_option(option, "-Xshare:on")) { 3211 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3212 return JNI_EINVAL; 3213 } 3214 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3215 return JNI_EINVAL; 3216 } 3217 // -Xshare:auto 3218 } else if (match_option(option, "-Xshare:auto")) { 3219 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3220 return JNI_EINVAL; 3221 } 3222 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3223 return JNI_EINVAL; 3224 } 3225 // -Xshare:off 3226 } else if (match_option(option, "-Xshare:off")) { 3227 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3228 return JNI_EINVAL; 3229 } 3230 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3231 return JNI_EINVAL; 3232 } 3233 // -Xverify 3234 } else if (match_option(option, "-Xverify", &tail)) { 3235 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3236 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3237 return JNI_EINVAL; 3238 } 3239 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3240 return JNI_EINVAL; 3241 } 3242 } else if (strcmp(tail, ":remote") == 0) { 3243 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3244 return JNI_EINVAL; 3245 } 3246 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3247 return JNI_EINVAL; 3248 } 3249 } else if (strcmp(tail, ":none") == 0) { 3250 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3251 return JNI_EINVAL; 3252 } 3253 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3254 return JNI_EINVAL; 3255 } 3256 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3257 return JNI_EINVAL; 3258 } 3259 // -Xdebug 3260 } else if (match_option(option, "-Xdebug")) { 3261 // note this flag has been used, then ignore 3262 set_xdebug_mode(true); 3263 // -Xnoagent 3264 } else if (match_option(option, "-Xnoagent")) { 3265 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3266 } else if (match_option(option, "-Xloggc:", &tail)) { 3267 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3268 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3269 _gc_log_filename = os::strdup_check_oom(tail); 3270 } else if (match_option(option, "-Xlog", &tail)) { 3271 bool ret = false; 3272 if (strcmp(tail, ":help") == 0) { 3273 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3274 vm_exit(0); 3275 } else if (strcmp(tail, ":disable") == 0) { 3276 LogConfiguration::disable_logging(); 3277 ret = true; 3278 } else if (*tail == '\0') { 3279 ret = LogConfiguration::parse_command_line_arguments(); 3280 assert(ret, "-Xlog without arguments should never fail to parse"); 3281 } else if (*tail == ':') { 3282 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3283 } 3284 if (ret == false) { 3285 jio_fprintf(defaultStream::error_stream(), 3286 "Invalid -Xlog option '-Xlog%s'\n", 3287 tail); 3288 return JNI_EINVAL; 3289 } 3290 // JNI hooks 3291 } else if (match_option(option, "-Xcheck", &tail)) { 3292 if (!strcmp(tail, ":jni")) { 3293 #if !INCLUDE_JNI_CHECK 3294 warning("JNI CHECKING is not supported in this VM"); 3295 #else 3296 CheckJNICalls = true; 3297 #endif // INCLUDE_JNI_CHECK 3298 } else if (is_bad_option(option, args->ignoreUnrecognized, 3299 "check")) { 3300 return JNI_EINVAL; 3301 } 3302 } else if (match_option(option, "vfprintf")) { 3303 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3304 } else if (match_option(option, "exit")) { 3305 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3306 } else if (match_option(option, "abort")) { 3307 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3308 // -XX:+AggressiveHeap 3309 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3310 jint result = set_aggressive_heap_flags(); 3311 if (result != JNI_OK) { 3312 return result; 3313 } 3314 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3315 // and the last option wins. 3316 } else if (match_option(option, "-XX:+NeverTenure")) { 3317 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3318 return JNI_EINVAL; 3319 } 3320 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3321 return JNI_EINVAL; 3322 } 3323 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3324 return JNI_EINVAL; 3325 } 3326 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3327 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3328 return JNI_EINVAL; 3329 } 3330 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3331 return JNI_EINVAL; 3332 } 3333 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3334 return JNI_EINVAL; 3335 } 3336 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3337 uintx max_tenuring_thresh = 0; 3338 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3339 jio_fprintf(defaultStream::error_stream(), 3340 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3341 return JNI_EINVAL; 3342 } 3343 3344 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3345 return JNI_EINVAL; 3346 } 3347 3348 if (MaxTenuringThreshold == 0) { 3349 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3350 return JNI_EINVAL; 3351 } 3352 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3353 return JNI_EINVAL; 3354 } 3355 } else { 3356 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3357 return JNI_EINVAL; 3358 } 3359 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3360 return JNI_EINVAL; 3361 } 3362 } 3363 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3364 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3365 return JNI_EINVAL; 3366 } 3367 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3368 return JNI_EINVAL; 3369 } 3370 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3371 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3372 return JNI_EINVAL; 3373 } 3374 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3375 return JNI_EINVAL; 3376 } 3377 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3378 #if defined(DTRACE_ENABLED) 3379 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3380 return JNI_EINVAL; 3381 } 3382 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3383 return JNI_EINVAL; 3384 } 3385 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3386 return JNI_EINVAL; 3387 } 3388 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3389 return JNI_EINVAL; 3390 } 3391 #else // defined(DTRACE_ENABLED) 3392 jio_fprintf(defaultStream::error_stream(), 3393 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3394 return JNI_EINVAL; 3395 #endif // defined(DTRACE_ENABLED) 3396 #ifdef ASSERT 3397 } else if (match_option(option, "-XX:+FullGCALot")) { 3398 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3399 return JNI_EINVAL; 3400 } 3401 // disable scavenge before parallel mark-compact 3402 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3403 return JNI_EINVAL; 3404 } 3405 #endif 3406 #if !INCLUDE_MANAGEMENT 3407 } else if (match_option(option, "-XX:+ManagementServer")) { 3408 jio_fprintf(defaultStream::error_stream(), 3409 "ManagementServer is not supported in this VM.\n"); 3410 return JNI_ERR; 3411 #endif // INCLUDE_MANAGEMENT 3412 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3413 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3414 // already been handled 3415 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3416 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3417 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3418 return JNI_EINVAL; 3419 } 3420 } 3421 // Unknown option 3422 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3423 return JNI_ERR; 3424 } 3425 } 3426 3427 // PrintSharedArchiveAndExit will turn on 3428 // -Xshare:on 3429 // -Xlog:class+path=info 3430 if (PrintSharedArchiveAndExit) { 3431 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3432 return JNI_EINVAL; 3433 } 3434 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3435 return JNI_EINVAL; 3436 } 3437 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3438 } 3439 3440 // Change the default value for flags which have different default values 3441 // when working with older JDKs. 3442 #ifdef LINUX 3443 if (JDK_Version::current().compare_major(6) <= 0 && 3444 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3445 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3446 } 3447 #endif // LINUX 3448 fix_appclasspath(); 3449 return JNI_OK; 3450 } 3451 3452 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3453 // For java.base check for duplicate --patch-module options being specified on the command line. 3454 // This check is only required for java.base, all other duplicate module specifications 3455 // will be checked during module system initialization. The module system initialization 3456 // will throw an ExceptionInInitializerError if this situation occurs. 3457 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3458 if (*patch_mod_javabase) { 3459 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3460 } else { 3461 *patch_mod_javabase = true; 3462 } 3463 } 3464 3465 // Create GrowableArray lazily, only if --patch-module has been specified 3466 if (_patch_mod_prefix == NULL) { 3467 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3468 } 3469 3470 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3471 } 3472 3473 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3474 // 3475 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3476 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3477 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3478 // path is treated as the current directory. 3479 // 3480 // This causes problems with CDS, which requires that all directories specified in the classpath 3481 // must be empty. In most cases, applications do NOT want to load classes from the current 3482 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3483 // scripts compatible with CDS. 3484 void Arguments::fix_appclasspath() { 3485 if (IgnoreEmptyClassPaths) { 3486 const char separator = *os::path_separator(); 3487 const char* src = _java_class_path->value(); 3488 3489 // skip over all the leading empty paths 3490 while (*src == separator) { 3491 src ++; 3492 } 3493 3494 char* copy = os::strdup_check_oom(src, mtArguments); 3495 3496 // trim all trailing empty paths 3497 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3498 *tail = '\0'; 3499 } 3500 3501 char from[3] = {separator, separator, '\0'}; 3502 char to [2] = {separator, '\0'}; 3503 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3504 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3505 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3506 } 3507 3508 _java_class_path->set_writeable_value(copy); 3509 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3510 } 3511 } 3512 3513 static bool has_jar_files(const char* directory) { 3514 DIR* dir = os::opendir(directory); 3515 if (dir == NULL) return false; 3516 3517 struct dirent *entry; 3518 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3519 bool hasJarFile = false; 3520 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3521 const char* name = entry->d_name; 3522 const char* ext = name + strlen(name) - 4; 3523 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3524 } 3525 FREE_C_HEAP_ARRAY(char, dbuf); 3526 os::closedir(dir); 3527 return hasJarFile ; 3528 } 3529 3530 static int check_non_empty_dirs(const char* path) { 3531 const char separator = *os::path_separator(); 3532 const char* const end = path + strlen(path); 3533 int nonEmptyDirs = 0; 3534 while (path < end) { 3535 const char* tmp_end = strchr(path, separator); 3536 if (tmp_end == NULL) { 3537 if (has_jar_files(path)) { 3538 nonEmptyDirs++; 3539 jio_fprintf(defaultStream::output_stream(), 3540 "Non-empty directory: %s\n", path); 3541 } 3542 path = end; 3543 } else { 3544 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3545 memcpy(dirpath, path, tmp_end - path); 3546 dirpath[tmp_end - path] = '\0'; 3547 if (has_jar_files(dirpath)) { 3548 nonEmptyDirs++; 3549 jio_fprintf(defaultStream::output_stream(), 3550 "Non-empty directory: %s\n", dirpath); 3551 } 3552 FREE_C_HEAP_ARRAY(char, dirpath); 3553 path = tmp_end + 1; 3554 } 3555 } 3556 return nonEmptyDirs; 3557 } 3558 3559 jint Arguments::finalize_vm_init_args() { 3560 // check if the default lib/endorsed directory exists; if so, error 3561 char path[JVM_MAXPATHLEN]; 3562 const char* fileSep = os::file_separator(); 3563 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3564 3565 if (CheckEndorsedAndExtDirs) { 3566 int nonEmptyDirs = 0; 3567 // check endorsed directory 3568 nonEmptyDirs += check_non_empty_dirs(path); 3569 // check the extension directories 3570 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3571 if (nonEmptyDirs > 0) { 3572 return JNI_ERR; 3573 } 3574 } 3575 3576 DIR* dir = os::opendir(path); 3577 if (dir != NULL) { 3578 jio_fprintf(defaultStream::output_stream(), 3579 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3580 "in modular form will be supported via the concept of upgradeable modules.\n"); 3581 os::closedir(dir); 3582 return JNI_ERR; 3583 } 3584 3585 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3586 dir = os::opendir(path); 3587 if (dir != NULL) { 3588 jio_fprintf(defaultStream::output_stream(), 3589 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3590 "Use -classpath instead.\n."); 3591 os::closedir(dir); 3592 return JNI_ERR; 3593 } 3594 3595 // This must be done after all arguments have been processed. 3596 // java_compiler() true means set to "NONE" or empty. 3597 if (java_compiler() && !xdebug_mode()) { 3598 // For backwards compatibility, we switch to interpreted mode if 3599 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3600 // not specified. 3601 set_mode_flags(_int); 3602 } 3603 3604 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3605 // but like -Xint, leave compilation thresholds unaffected. 3606 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3607 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3608 set_mode_flags(_int); 3609 } 3610 3611 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3612 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3613 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3614 } 3615 3616 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3617 // Don't degrade server performance for footprint 3618 if (FLAG_IS_DEFAULT(UseLargePages) && 3619 MaxHeapSize < LargePageHeapSizeThreshold) { 3620 // No need for large granularity pages w/small heaps. 3621 // Note that large pages are enabled/disabled for both the 3622 // Java heap and the code cache. 3623 FLAG_SET_DEFAULT(UseLargePages, false); 3624 } 3625 3626 #elif defined(COMPILER2) 3627 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3628 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3629 } 3630 #endif 3631 3632 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3633 UNSUPPORTED_OPTION(ProfileInterpreter); 3634 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3635 #endif 3636 3637 #ifndef TIERED 3638 // Tiered compilation is undefined. 3639 UNSUPPORTED_OPTION(TieredCompilation); 3640 #endif 3641 3642 #if INCLUDE_JVMCI 3643 if (EnableJVMCI && 3644 !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) { 3645 return JNI_ENOMEM; 3646 } 3647 #endif 3648 3649 // If we are running in a headless jre, force java.awt.headless property 3650 // to be true unless the property has already been set. 3651 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3652 if (os::is_headless_jre()) { 3653 const char* headless = Arguments::get_property("java.awt.headless"); 3654 if (headless == NULL) { 3655 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3656 if (headless_env == NULL) { 3657 if (!add_property("java.awt.headless=true")) { 3658 return JNI_ENOMEM; 3659 } 3660 } else { 3661 char buffer[256]; 3662 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3663 if (!add_property(buffer)) { 3664 return JNI_ENOMEM; 3665 } 3666 } 3667 } 3668 } 3669 3670 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3671 // CMS can only be used with ParNew 3672 FLAG_SET_ERGO(bool, UseParNewGC, true); 3673 } 3674 3675 if (!check_vm_args_consistency()) { 3676 return JNI_ERR; 3677 } 3678 3679 return JNI_OK; 3680 } 3681 3682 // Helper class for controlling the lifetime of JavaVMInitArgs 3683 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3684 // deleted on the destruction of the ScopedVMInitArgs object. 3685 class ScopedVMInitArgs : public StackObj { 3686 private: 3687 JavaVMInitArgs _args; 3688 char* _container_name; 3689 bool _is_set; 3690 char* _vm_options_file_arg; 3691 3692 public: 3693 ScopedVMInitArgs(const char *container_name) { 3694 _args.version = JNI_VERSION_1_2; 3695 _args.nOptions = 0; 3696 _args.options = NULL; 3697 _args.ignoreUnrecognized = false; 3698 _container_name = (char *)container_name; 3699 _is_set = false; 3700 _vm_options_file_arg = NULL; 3701 } 3702 3703 // Populates the JavaVMInitArgs object represented by this 3704 // ScopedVMInitArgs object with the arguments in options. The 3705 // allocated memory is deleted by the destructor. If this method 3706 // returns anything other than JNI_OK, then this object is in a 3707 // partially constructed state, and should be abandoned. 3708 jint set_args(GrowableArray<JavaVMOption>* options) { 3709 _is_set = true; 3710 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3711 JavaVMOption, options->length(), mtArguments); 3712 if (options_arr == NULL) { 3713 return JNI_ENOMEM; 3714 } 3715 _args.options = options_arr; 3716 3717 for (int i = 0; i < options->length(); i++) { 3718 options_arr[i] = options->at(i); 3719 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3720 if (options_arr[i].optionString == NULL) { 3721 // Rely on the destructor to do cleanup. 3722 _args.nOptions = i; 3723 return JNI_ENOMEM; 3724 } 3725 } 3726 3727 _args.nOptions = options->length(); 3728 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3729 return JNI_OK; 3730 } 3731 3732 JavaVMInitArgs* get() { return &_args; } 3733 char* container_name() { return _container_name; } 3734 bool is_set() { return _is_set; } 3735 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3736 char* vm_options_file_arg() { return _vm_options_file_arg; } 3737 3738 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3739 if (_vm_options_file_arg != NULL) { 3740 os::free(_vm_options_file_arg); 3741 } 3742 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3743 } 3744 3745 ~ScopedVMInitArgs() { 3746 if (_vm_options_file_arg != NULL) { 3747 os::free(_vm_options_file_arg); 3748 } 3749 if (_args.options == NULL) return; 3750 for (int i = 0; i < _args.nOptions; i++) { 3751 os::free(_args.options[i].optionString); 3752 } 3753 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3754 } 3755 3756 // Insert options into this option list, to replace option at 3757 // vm_options_file_pos (-XX:VMOptionsFile) 3758 jint insert(const JavaVMInitArgs* args, 3759 const JavaVMInitArgs* args_to_insert, 3760 const int vm_options_file_pos) { 3761 assert(_args.options == NULL, "shouldn't be set yet"); 3762 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3763 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3764 3765 int length = args->nOptions + args_to_insert->nOptions - 1; 3766 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3767 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3768 for (int i = 0; i < args->nOptions; i++) { 3769 if (i == vm_options_file_pos) { 3770 // insert the new options starting at the same place as the 3771 // -XX:VMOptionsFile option 3772 for (int j = 0; j < args_to_insert->nOptions; j++) { 3773 options->push(args_to_insert->options[j]); 3774 } 3775 } else { 3776 options->push(args->options[i]); 3777 } 3778 } 3779 // make into options array 3780 jint result = set_args(options); 3781 delete options; 3782 return result; 3783 } 3784 }; 3785 3786 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3787 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3788 } 3789 3790 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3791 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3792 } 3793 3794 jint Arguments::parse_options_environment_variable(const char* name, 3795 ScopedVMInitArgs* vm_args) { 3796 char *buffer = ::getenv(name); 3797 3798 // Don't check this environment variable if user has special privileges 3799 // (e.g. unix su command). 3800 if (buffer == NULL || os::have_special_privileges()) { 3801 return JNI_OK; 3802 } 3803 3804 if ((buffer = os::strdup(buffer)) == NULL) { 3805 return JNI_ENOMEM; 3806 } 3807 3808 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3809 3810 os::free(buffer); 3811 return retcode; 3812 } 3813 3814 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3815 // read file into buffer 3816 int fd = ::open(file_name, O_RDONLY); 3817 if (fd < 0) { 3818 jio_fprintf(defaultStream::error_stream(), 3819 "Could not open options file '%s'\n", 3820 file_name); 3821 return JNI_ERR; 3822 } 3823 3824 struct stat stbuf; 3825 int retcode = os::stat(file_name, &stbuf); 3826 if (retcode != 0) { 3827 jio_fprintf(defaultStream::error_stream(), 3828 "Could not stat options file '%s'\n", 3829 file_name); 3830 os::close(fd); 3831 return JNI_ERR; 3832 } 3833 3834 if (stbuf.st_size == 0) { 3835 // tell caller there is no option data and that is ok 3836 os::close(fd); 3837 return JNI_OK; 3838 } 3839 3840 // '+ 1' for NULL termination even with max bytes 3841 size_t bytes_alloc = stbuf.st_size + 1; 3842 3843 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3844 if (NULL == buf) { 3845 jio_fprintf(defaultStream::error_stream(), 3846 "Could not allocate read buffer for options file parse\n"); 3847 os::close(fd); 3848 return JNI_ENOMEM; 3849 } 3850 3851 memset(buf, 0, bytes_alloc); 3852 3853 // Fill buffer 3854 // Use ::read() instead of os::read because os::read() 3855 // might do a thread state transition 3856 // and it is too early for that here 3857 3858 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3859 os::close(fd); 3860 if (bytes_read < 0) { 3861 FREE_C_HEAP_ARRAY(char, buf); 3862 jio_fprintf(defaultStream::error_stream(), 3863 "Could not read options file '%s'\n", file_name); 3864 return JNI_ERR; 3865 } 3866 3867 if (bytes_read == 0) { 3868 // tell caller there is no option data and that is ok 3869 FREE_C_HEAP_ARRAY(char, buf); 3870 return JNI_OK; 3871 } 3872 3873 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3874 3875 FREE_C_HEAP_ARRAY(char, buf); 3876 return retcode; 3877 } 3878 3879 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3880 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3881 3882 // some pointers to help with parsing 3883 char *buffer_end = buffer + buf_len; 3884 char *opt_hd = buffer; 3885 char *wrt = buffer; 3886 char *rd = buffer; 3887 3888 // parse all options 3889 while (rd < buffer_end) { 3890 // skip leading white space from the input string 3891 while (rd < buffer_end && isspace(*rd)) { 3892 rd++; 3893 } 3894 3895 if (rd >= buffer_end) { 3896 break; 3897 } 3898 3899 // Remember this is where we found the head of the token. 3900 opt_hd = wrt; 3901 3902 // Tokens are strings of non white space characters separated 3903 // by one or more white spaces. 3904 while (rd < buffer_end && !isspace(*rd)) { 3905 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3906 int quote = *rd; // matching quote to look for 3907 rd++; // don't copy open quote 3908 while (rd < buffer_end && *rd != quote) { 3909 // include everything (even spaces) 3910 // up until the close quote 3911 *wrt++ = *rd++; // copy to option string 3912 } 3913 3914 if (rd < buffer_end) { 3915 rd++; // don't copy close quote 3916 } else { 3917 // did not see closing quote 3918 jio_fprintf(defaultStream::error_stream(), 3919 "Unmatched quote in %s\n", name); 3920 delete options; 3921 return JNI_ERR; 3922 } 3923 } else { 3924 *wrt++ = *rd++; // copy to option string 3925 } 3926 } 3927 3928 // steal a white space character and set it to NULL 3929 *wrt++ = '\0'; 3930 // We now have a complete token 3931 3932 JavaVMOption option; 3933 option.optionString = opt_hd; 3934 option.extraInfo = NULL; 3935 3936 options->append(option); // Fill in option 3937 3938 rd++; // Advance to next character 3939 } 3940 3941 // Fill out JavaVMInitArgs structure. 3942 jint status = vm_args->set_args(options); 3943 3944 delete options; 3945 return status; 3946 } 3947 3948 void Arguments::set_shared_spaces_flags() { 3949 if (DumpSharedSpaces) { 3950 if (FailOverToOldVerifier) { 3951 // Don't fall back to the old verifier on verification failure. If a 3952 // class fails verification with the split verifier, it might fail the 3953 // CDS runtime verifier constraint check. In that case, we don't want 3954 // to share the class. We only archive classes that pass the split verifier. 3955 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3956 } 3957 3958 if (RequireSharedSpaces) { 3959 warning("Cannot dump shared archive while using shared archive"); 3960 } 3961 UseSharedSpaces = false; 3962 #ifdef _LP64 3963 if (!UseCompressedOops || !UseCompressedClassPointers) { 3964 vm_exit_during_initialization( 3965 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3966 } 3967 } else { 3968 if (!UseCompressedOops || !UseCompressedClassPointers) { 3969 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3970 } 3971 #endif 3972 } 3973 } 3974 3975 // Sharing support 3976 // Construct the path to the archive 3977 static char* get_shared_archive_path() { 3978 char *shared_archive_path; 3979 if (SharedArchiveFile == NULL) { 3980 char jvm_path[JVM_MAXPATHLEN]; 3981 os::jvm_path(jvm_path, sizeof(jvm_path)); 3982 char *end = strrchr(jvm_path, *os::file_separator()); 3983 if (end != NULL) *end = '\0'; 3984 size_t jvm_path_len = strlen(jvm_path); 3985 size_t file_sep_len = strlen(os::file_separator()); 3986 const size_t len = jvm_path_len + file_sep_len + 20; 3987 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3988 if (shared_archive_path != NULL) { 3989 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3990 jvm_path, os::file_separator()); 3991 } 3992 } else { 3993 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3994 } 3995 return shared_archive_path; 3996 } 3997 3998 #ifndef PRODUCT 3999 // Determine whether LogVMOutput should be implicitly turned on. 4000 static bool use_vm_log() { 4001 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4002 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4003 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4004 PrintAssembly || TraceDeoptimization || TraceDependencies || 4005 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4006 return true; 4007 } 4008 4009 #ifdef COMPILER1 4010 if (PrintC1Statistics) { 4011 return true; 4012 } 4013 #endif // COMPILER1 4014 4015 #ifdef COMPILER2 4016 if (PrintOptoAssembly || PrintOptoStatistics) { 4017 return true; 4018 } 4019 #endif // COMPILER2 4020 4021 return false; 4022 } 4023 4024 #endif // PRODUCT 4025 4026 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4027 for (int index = 0; index < args->nOptions; index++) { 4028 const JavaVMOption* option = args->options + index; 4029 const char* tail; 4030 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4031 return true; 4032 } 4033 } 4034 return false; 4035 } 4036 4037 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4038 const char* vm_options_file, 4039 const int vm_options_file_pos, 4040 ScopedVMInitArgs* vm_options_file_args, 4041 ScopedVMInitArgs* args_out) { 4042 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4043 if (code != JNI_OK) { 4044 return code; 4045 } 4046 4047 if (vm_options_file_args->get()->nOptions < 1) { 4048 return JNI_OK; 4049 } 4050 4051 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4052 jio_fprintf(defaultStream::error_stream(), 4053 "A VM options file may not refer to a VM options file. " 4054 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4055 "options file '%s' in options container '%s' is an error.\n", 4056 vm_options_file_args->vm_options_file_arg(), 4057 vm_options_file_args->container_name()); 4058 return JNI_EINVAL; 4059 } 4060 4061 return args_out->insert(args, vm_options_file_args->get(), 4062 vm_options_file_pos); 4063 } 4064 4065 // Expand -XX:VMOptionsFile found in args_in as needed. 4066 // mod_args and args_out parameters may return values as needed. 4067 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4068 ScopedVMInitArgs* mod_args, 4069 JavaVMInitArgs** args_out) { 4070 jint code = match_special_option_and_act(args_in, mod_args); 4071 if (code != JNI_OK) { 4072 return code; 4073 } 4074 4075 if (mod_args->is_set()) { 4076 // args_in contains -XX:VMOptionsFile and mod_args contains the 4077 // original options from args_in along with the options expanded 4078 // from the VMOptionsFile. Return a short-hand to the caller. 4079 *args_out = mod_args->get(); 4080 } else { 4081 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4082 } 4083 return JNI_OK; 4084 } 4085 4086 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4087 ScopedVMInitArgs* args_out) { 4088 // Remaining part of option string 4089 const char* tail; 4090 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4091 4092 for (int index = 0; index < args->nOptions; index++) { 4093 const JavaVMOption* option = args->options + index; 4094 if (ArgumentsExt::process_options(option)) { 4095 continue; 4096 } 4097 if (match_option(option, "-XX:Flags=", &tail)) { 4098 Arguments::set_jvm_flags_file(tail); 4099 continue; 4100 } 4101 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4102 if (vm_options_file_args.found_vm_options_file_arg()) { 4103 jio_fprintf(defaultStream::error_stream(), 4104 "The option '%s' is already specified in the options " 4105 "container '%s' so the specification of '%s' in the " 4106 "same options container is an error.\n", 4107 vm_options_file_args.vm_options_file_arg(), 4108 vm_options_file_args.container_name(), 4109 option->optionString); 4110 return JNI_EINVAL; 4111 } 4112 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4113 // If there's a VMOptionsFile, parse that 4114 jint code = insert_vm_options_file(args, tail, index, 4115 &vm_options_file_args, args_out); 4116 if (code != JNI_OK) { 4117 return code; 4118 } 4119 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4120 if (args_out->is_set()) { 4121 // The VMOptions file inserted some options so switch 'args' 4122 // to the new set of options, and continue processing which 4123 // preserves "last option wins" semantics. 4124 args = args_out->get(); 4125 // The first option from the VMOptionsFile replaces the 4126 // current option. So we back track to process the 4127 // replacement option. 4128 index--; 4129 } 4130 continue; 4131 } 4132 if (match_option(option, "-XX:+PrintVMOptions")) { 4133 PrintVMOptions = true; 4134 continue; 4135 } 4136 if (match_option(option, "-XX:-PrintVMOptions")) { 4137 PrintVMOptions = false; 4138 continue; 4139 } 4140 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4141 IgnoreUnrecognizedVMOptions = true; 4142 continue; 4143 } 4144 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4145 IgnoreUnrecognizedVMOptions = false; 4146 continue; 4147 } 4148 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4149 CommandLineFlags::printFlags(tty, false); 4150 vm_exit(0); 4151 } 4152 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4153 #if INCLUDE_NMT 4154 // The launcher did not setup nmt environment variable properly. 4155 if (!MemTracker::check_launcher_nmt_support(tail)) { 4156 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4157 } 4158 4159 // Verify if nmt option is valid. 4160 if (MemTracker::verify_nmt_option()) { 4161 // Late initialization, still in single-threaded mode. 4162 if (MemTracker::tracking_level() >= NMT_summary) { 4163 MemTracker::init(); 4164 } 4165 } else { 4166 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4167 } 4168 continue; 4169 #else 4170 jio_fprintf(defaultStream::error_stream(), 4171 "Native Memory Tracking is not supported in this VM\n"); 4172 return JNI_ERR; 4173 #endif 4174 } 4175 4176 #ifndef PRODUCT 4177 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4178 CommandLineFlags::printFlags(tty, true); 4179 vm_exit(0); 4180 } 4181 #endif 4182 } 4183 return JNI_OK; 4184 } 4185 4186 static void print_options(const JavaVMInitArgs *args) { 4187 const char* tail; 4188 for (int index = 0; index < args->nOptions; index++) { 4189 const JavaVMOption *option = args->options + index; 4190 if (match_option(option, "-XX:", &tail)) { 4191 logOption(tail); 4192 } 4193 } 4194 } 4195 4196 bool Arguments::handle_deprecated_print_gc_flags() { 4197 if (PrintGC) { 4198 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4199 } 4200 if (PrintGCDetails) { 4201 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4202 } 4203 4204 if (_gc_log_filename != NULL) { 4205 // -Xloggc was used to specify a filename 4206 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4207 4208 LogTarget(Error, logging) target; 4209 LogStreamCHeap errstream(target); 4210 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4211 } else if (PrintGC || PrintGCDetails) { 4212 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4213 } 4214 return true; 4215 } 4216 4217 void Arguments::handle_extra_cms_flags(const char* msg) { 4218 SpecialFlag flag; 4219 const char *flag_name = "UseConcMarkSweepGC"; 4220 if (lookup_special_flag(flag_name, flag)) { 4221 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4222 warning("%s", msg); 4223 } 4224 } 4225 4226 // Parse entry point called from JNI_CreateJavaVM 4227 4228 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4229 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4230 4231 // Initialize ranges, constraints and writeables 4232 CommandLineFlagRangeList::init(); 4233 CommandLineFlagConstraintList::init(); 4234 CommandLineFlagWriteableList::init(); 4235 4236 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4237 const char* hotspotrc = ".hotspotrc"; 4238 bool settings_file_specified = false; 4239 bool needs_hotspotrc_warning = false; 4240 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4241 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4242 4243 // Pointers to current working set of containers 4244 JavaVMInitArgs* cur_cmd_args; 4245 JavaVMInitArgs* cur_java_options_args; 4246 JavaVMInitArgs* cur_java_tool_options_args; 4247 4248 // Containers for modified/expanded options 4249 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4250 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4251 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4252 4253 4254 jint code = 4255 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4256 if (code != JNI_OK) { 4257 return code; 4258 } 4259 4260 code = parse_java_options_environment_variable(&initial_java_options_args); 4261 if (code != JNI_OK) { 4262 return code; 4263 } 4264 4265 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4266 &mod_java_tool_options_args, 4267 &cur_java_tool_options_args); 4268 if (code != JNI_OK) { 4269 return code; 4270 } 4271 4272 code = expand_vm_options_as_needed(initial_cmd_args, 4273 &mod_cmd_args, 4274 &cur_cmd_args); 4275 if (code != JNI_OK) { 4276 return code; 4277 } 4278 4279 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4280 &mod_java_options_args, 4281 &cur_java_options_args); 4282 if (code != JNI_OK) { 4283 return code; 4284 } 4285 4286 const char* flags_file = Arguments::get_jvm_flags_file(); 4287 settings_file_specified = (flags_file != NULL); 4288 4289 if (IgnoreUnrecognizedVMOptions) { 4290 cur_cmd_args->ignoreUnrecognized = true; 4291 cur_java_tool_options_args->ignoreUnrecognized = true; 4292 cur_java_options_args->ignoreUnrecognized = true; 4293 } 4294 4295 // Parse specified settings file 4296 if (settings_file_specified) { 4297 if (!process_settings_file(flags_file, true, 4298 cur_cmd_args->ignoreUnrecognized)) { 4299 return JNI_EINVAL; 4300 } 4301 } else { 4302 #ifdef ASSERT 4303 // Parse default .hotspotrc settings file 4304 if (!process_settings_file(".hotspotrc", false, 4305 cur_cmd_args->ignoreUnrecognized)) { 4306 return JNI_EINVAL; 4307 } 4308 #else 4309 struct stat buf; 4310 if (os::stat(hotspotrc, &buf) == 0) { 4311 needs_hotspotrc_warning = true; 4312 } 4313 #endif 4314 } 4315 4316 if (PrintVMOptions) { 4317 print_options(cur_java_tool_options_args); 4318 print_options(cur_cmd_args); 4319 print_options(cur_java_options_args); 4320 } 4321 4322 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4323 jint result = parse_vm_init_args(cur_java_tool_options_args, 4324 cur_java_options_args, 4325 cur_cmd_args); 4326 4327 if (result != JNI_OK) { 4328 return result; 4329 } 4330 4331 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4332 SharedArchivePath = get_shared_archive_path(); 4333 if (SharedArchivePath == NULL) { 4334 return JNI_ENOMEM; 4335 } 4336 4337 // Set up VerifySharedSpaces 4338 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4339 VerifySharedSpaces = true; 4340 } 4341 4342 // Delay warning until here so that we've had a chance to process 4343 // the -XX:-PrintWarnings flag 4344 if (needs_hotspotrc_warning) { 4345 warning("%s file is present but has been ignored. " 4346 "Run with -XX:Flags=%s to load the file.", 4347 hotspotrc, hotspotrc); 4348 } 4349 4350 if (needs_module_property_warning) { 4351 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4352 " names that are reserved for internal use."); 4353 } 4354 4355 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4356 UNSUPPORTED_OPTION(UseLargePages); 4357 #endif 4358 4359 ArgumentsExt::report_unsupported_options(); 4360 4361 #ifndef PRODUCT 4362 if (TraceBytecodesAt != 0) { 4363 TraceBytecodes = true; 4364 } 4365 if (CountCompiledCalls) { 4366 if (UseCounterDecay) { 4367 warning("UseCounterDecay disabled because CountCalls is set"); 4368 UseCounterDecay = false; 4369 } 4370 } 4371 #endif // PRODUCT 4372 4373 if (ScavengeRootsInCode == 0) { 4374 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4375 warning("Forcing ScavengeRootsInCode non-zero"); 4376 } 4377 ScavengeRootsInCode = 1; 4378 } 4379 4380 if (!handle_deprecated_print_gc_flags()) { 4381 return JNI_EINVAL; 4382 } 4383 4384 // Set object alignment values. 4385 set_object_alignment(); 4386 4387 #if !INCLUDE_CDS 4388 if (DumpSharedSpaces || RequireSharedSpaces) { 4389 jio_fprintf(defaultStream::error_stream(), 4390 "Shared spaces are not supported in this VM\n"); 4391 return JNI_ERR; 4392 } 4393 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4394 warning("Shared spaces are not supported in this VM"); 4395 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4396 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4397 } 4398 no_shared_spaces("CDS Disabled"); 4399 #endif // INCLUDE_CDS 4400 4401 return JNI_OK; 4402 } 4403 4404 jint Arguments::apply_ergo() { 4405 4406 // Set flags based on ergonomics. 4407 set_ergonomics_flags(); 4408 4409 set_shared_spaces_flags(); 4410 4411 // Check the GC selections again. 4412 if (!check_gc_consistency()) { 4413 return JNI_EINVAL; 4414 } 4415 4416 if (TieredCompilation) { 4417 set_tiered_flags(); 4418 } else { 4419 int max_compilation_policy_choice = 1; 4420 #ifdef COMPILER2 4421 max_compilation_policy_choice = 2; 4422 #endif 4423 // Check if the policy is valid. 4424 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4425 vm_exit_during_initialization( 4426 "Incompatible compilation policy selected", NULL); 4427 } 4428 // Scale CompileThreshold 4429 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4430 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4431 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4432 } 4433 } 4434 4435 #ifdef COMPILER2 4436 #ifndef PRODUCT 4437 if (PrintIdealGraphLevel > 0) { 4438 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4439 } 4440 #endif 4441 #endif 4442 4443 // Set heap size based on available physical memory 4444 set_heap_size(); 4445 4446 ArgumentsExt::set_gc_specific_flags(); 4447 4448 // Initialize Metaspace flags and alignments 4449 Metaspace::ergo_initialize(); 4450 4451 // Set bytecode rewriting flags 4452 set_bytecode_flags(); 4453 4454 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4455 jint code = set_aggressive_opts_flags(); 4456 if (code != JNI_OK) { 4457 return code; 4458 } 4459 4460 // Turn off biased locking for locking debug mode flags, 4461 // which are subtly different from each other but neither works with 4462 // biased locking 4463 if (UseHeavyMonitors 4464 #ifdef COMPILER1 4465 || !UseFastLocking 4466 #endif // COMPILER1 4467 #if INCLUDE_JVMCI 4468 || !JVMCIUseFastLocking 4469 #endif 4470 ) { 4471 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4472 // flag set to true on command line; warn the user that they 4473 // can't enable biased locking here 4474 warning("Biased Locking is not supported with locking debug flags" 4475 "; ignoring UseBiasedLocking flag." ); 4476 } 4477 UseBiasedLocking = false; 4478 } 4479 4480 #ifdef CC_INTERP 4481 // Clear flags not supported on zero. 4482 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4483 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4484 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4485 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4486 #endif // CC_INTERP 4487 4488 #ifdef COMPILER2 4489 if (!EliminateLocks) { 4490 EliminateNestedLocks = false; 4491 } 4492 if (!Inline) { 4493 IncrementalInline = false; 4494 } 4495 #ifndef PRODUCT 4496 if (!IncrementalInline) { 4497 AlwaysIncrementalInline = false; 4498 } 4499 #endif 4500 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4501 // nothing to use the profiling, turn if off 4502 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4503 } 4504 #endif 4505 4506 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4507 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4508 DebugNonSafepoints = true; 4509 } 4510 4511 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4512 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4513 } 4514 4515 if (UseOnStackReplacement && !UseLoopCounter) { 4516 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4517 FLAG_SET_DEFAULT(UseLoopCounter, true); 4518 } 4519 4520 #ifndef PRODUCT 4521 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4522 if (use_vm_log()) { 4523 LogVMOutput = true; 4524 } 4525 } 4526 #endif // PRODUCT 4527 4528 if (PrintCommandLineFlags) { 4529 CommandLineFlags::printSetFlags(tty); 4530 } 4531 4532 // Apply CPU specific policy for the BiasedLocking 4533 if (UseBiasedLocking) { 4534 if (!VM_Version::use_biased_locking() && 4535 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4536 UseBiasedLocking = false; 4537 } 4538 } 4539 #ifdef COMPILER2 4540 if (!UseBiasedLocking || EmitSync != 0) { 4541 UseOptoBiasInlining = false; 4542 } 4543 #endif 4544 4545 return JNI_OK; 4546 } 4547 4548 jint Arguments::adjust_after_os() { 4549 if (UseNUMA) { 4550 if (UseParallelGC || UseParallelOldGC) { 4551 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4552 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4553 } 4554 } 4555 // UseNUMAInterleaving is set to ON for all collectors and 4556 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4557 // such as the parallel collector for Linux and Solaris will 4558 // interleave old gen and survivor spaces on top of NUMA 4559 // allocation policy for the eden space. 4560 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4561 // all platforms and ParallelGC on Windows will interleave all 4562 // of the heap spaces across NUMA nodes. 4563 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4564 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4565 } 4566 } 4567 return JNI_OK; 4568 } 4569 4570 int Arguments::PropertyList_count(SystemProperty* pl) { 4571 int count = 0; 4572 while(pl != NULL) { 4573 count++; 4574 pl = pl->next(); 4575 } 4576 return count; 4577 } 4578 4579 // Return the number of readable properties. 4580 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4581 int count = 0; 4582 while(pl != NULL) { 4583 if (pl->is_readable()) { 4584 count++; 4585 } 4586 pl = pl->next(); 4587 } 4588 return count; 4589 } 4590 4591 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4592 assert(key != NULL, "just checking"); 4593 SystemProperty* prop; 4594 for (prop = pl; prop != NULL; prop = prop->next()) { 4595 if (strcmp(key, prop->key()) == 0) return prop->value(); 4596 } 4597 return NULL; 4598 } 4599 4600 // Return the value of the requested property provided that it is a readable property. 4601 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4602 assert(key != NULL, "just checking"); 4603 SystemProperty* prop; 4604 // Return the property value if the keys match and the property is not internal or 4605 // it's the special internal property "jdk.boot.class.path.append". 4606 for (prop = pl; prop != NULL; prop = prop->next()) { 4607 if (strcmp(key, prop->key()) == 0) { 4608 if (!prop->internal()) { 4609 return prop->value(); 4610 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4611 return prop->value(); 4612 } else { 4613 // Property is internal and not jdk.boot.class.path.append so return NULL. 4614 return NULL; 4615 } 4616 } 4617 } 4618 return NULL; 4619 } 4620 4621 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4622 int count = 0; 4623 const char* ret_val = NULL; 4624 4625 while(pl != NULL) { 4626 if(count >= index) { 4627 ret_val = pl->key(); 4628 break; 4629 } 4630 count++; 4631 pl = pl->next(); 4632 } 4633 4634 return ret_val; 4635 } 4636 4637 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4638 int count = 0; 4639 char* ret_val = NULL; 4640 4641 while(pl != NULL) { 4642 if(count >= index) { 4643 ret_val = pl->value(); 4644 break; 4645 } 4646 count++; 4647 pl = pl->next(); 4648 } 4649 4650 return ret_val; 4651 } 4652 4653 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4654 SystemProperty* p = *plist; 4655 if (p == NULL) { 4656 *plist = new_p; 4657 } else { 4658 while (p->next() != NULL) { 4659 p = p->next(); 4660 } 4661 p->set_next(new_p); 4662 } 4663 } 4664 4665 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4666 bool writeable, bool internal) { 4667 if (plist == NULL) 4668 return; 4669 4670 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4671 PropertyList_add(plist, new_p); 4672 } 4673 4674 void Arguments::PropertyList_add(SystemProperty *element) { 4675 PropertyList_add(&_system_properties, element); 4676 } 4677 4678 // This add maintains unique property key in the list. 4679 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4680 PropertyAppendable append, PropertyWriteable writeable, 4681 PropertyInternal internal) { 4682 if (plist == NULL) 4683 return; 4684 4685 // If property key exist then update with new value. 4686 SystemProperty* prop; 4687 for (prop = *plist; prop != NULL; prop = prop->next()) { 4688 if (strcmp(k, prop->key()) == 0) { 4689 if (append == AppendProperty) { 4690 prop->append_value(v); 4691 } else { 4692 prop->set_value(v); 4693 } 4694 return; 4695 } 4696 } 4697 4698 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4699 } 4700 4701 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4702 // Returns true if all of the source pointed by src has been copied over to 4703 // the destination buffer pointed by buf. Otherwise, returns false. 4704 // Notes: 4705 // 1. If the length (buflen) of the destination buffer excluding the 4706 // NULL terminator character is not long enough for holding the expanded 4707 // pid characters, it also returns false instead of returning the partially 4708 // expanded one. 4709 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4710 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4711 char* buf, size_t buflen) { 4712 const char* p = src; 4713 char* b = buf; 4714 const char* src_end = &src[srclen]; 4715 char* buf_end = &buf[buflen - 1]; 4716 4717 while (p < src_end && b < buf_end) { 4718 if (*p == '%') { 4719 switch (*(++p)) { 4720 case '%': // "%%" ==> "%" 4721 *b++ = *p++; 4722 break; 4723 case 'p': { // "%p" ==> current process id 4724 // buf_end points to the character before the last character so 4725 // that we could write '\0' to the end of the buffer. 4726 size_t buf_sz = buf_end - b + 1; 4727 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4728 4729 // if jio_snprintf fails or the buffer is not long enough to hold 4730 // the expanded pid, returns false. 4731 if (ret < 0 || ret >= (int)buf_sz) { 4732 return false; 4733 } else { 4734 b += ret; 4735 assert(*b == '\0', "fail in copy_expand_pid"); 4736 if (p == src_end && b == buf_end + 1) { 4737 // reach the end of the buffer. 4738 return true; 4739 } 4740 } 4741 p++; 4742 break; 4743 } 4744 default : 4745 *b++ = '%'; 4746 } 4747 } else { 4748 *b++ = *p++; 4749 } 4750 } 4751 *b = '\0'; 4752 return (p == src_end); // return false if not all of the source was copied 4753 }