1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "code/codeCacheExtensions.hpp" 31 #include "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genCollectedHeap.hpp" 33 #include "gc/shared/referenceProcessor.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logTag.hpp" 37 #include "logging/logConfiguration.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/universe.inline.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "prims/jvmtiExport.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/arguments_ext.hpp" 44 #include "runtime/commandLineFlagConstraintList.hpp" 45 #include "runtime/commandLineFlagRangeList.hpp" 46 #include "runtime/globals.hpp" 47 #include "runtime/globals_extension.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/os.hpp" 50 #include "runtime/vm_version.hpp" 51 #include "services/management.hpp" 52 #include "services/memTracker.hpp" 53 #include "utilities/defaultStream.hpp" 54 #include "utilities/macros.hpp" 55 #include "utilities/stringUtils.hpp" 56 #if INCLUDE_JVMCI 57 #include "jvmci/jvmciRuntime.hpp" 58 #endif 59 #if INCLUDE_ALL_GCS 60 #include "gc/cms/compactibleFreeListSpace.hpp" 61 #include "gc/g1/g1CollectedHeap.inline.hpp" 62 #include "gc/parallel/parallelScavengeHeap.hpp" 63 #endif // INCLUDE_ALL_GCS 64 65 // Note: This is a special bug reporting site for the JVM 66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 67 #define DEFAULT_JAVA_LAUNCHER "generic" 68 69 #define UNSUPPORTED_GC_OPTION(gc) \ 70 do { \ 71 if (gc) { \ 72 if (FLAG_IS_CMDLINE(gc)) { \ 73 warning(#gc " is not supported in this VM. Using Serial GC."); \ 74 } \ 75 FLAG_SET_DEFAULT(gc, false); \ 76 } \ 77 } while(0) 78 79 char* Arguments::_jvm_flags_file = NULL; 80 char** Arguments::_jvm_flags_array = NULL; 81 int Arguments::_num_jvm_flags = 0; 82 char** Arguments::_jvm_args_array = NULL; 83 int Arguments::_num_jvm_args = 0; 84 char* Arguments::_java_command = NULL; 85 SystemProperty* Arguments::_system_properties = NULL; 86 const char* Arguments::_gc_log_filename = NULL; 87 bool Arguments::_has_profile = false; 88 size_t Arguments::_conservative_max_heap_alignment = 0; 89 size_t Arguments::_min_heap_size = 0; 90 Arguments::Mode Arguments::_mode = _mixed; 91 bool Arguments::_java_compiler = false; 92 bool Arguments::_xdebug_mode = false; 93 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 95 int Arguments::_sun_java_launcher_pid = -1; 96 bool Arguments::_sun_java_launcher_is_altjvm = false; 97 98 // These parameters are reset in method parse_vm_init_args() 99 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 100 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 101 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 102 bool Arguments::_ClipInlining = ClipInlining; 103 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 104 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 105 106 char* Arguments::SharedArchivePath = NULL; 107 108 AgentLibraryList Arguments::_libraryList; 109 AgentLibraryList Arguments::_agentList; 110 111 abort_hook_t Arguments::_abort_hook = NULL; 112 exit_hook_t Arguments::_exit_hook = NULL; 113 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 114 115 116 SystemProperty *Arguments::_sun_boot_library_path = NULL; 117 SystemProperty *Arguments::_java_library_path = NULL; 118 SystemProperty *Arguments::_java_home = NULL; 119 SystemProperty *Arguments::_java_class_path = NULL; 120 SystemProperty *Arguments::_sun_boot_class_path = NULL; 121 122 char* Arguments::_ext_dirs = NULL; 123 124 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 125 // part of the option string. 126 static bool match_option(const JavaVMOption *option, const char* name, 127 const char** tail) { 128 size_t len = strlen(name); 129 if (strncmp(option->optionString, name, len) == 0) { 130 *tail = option->optionString + len; 131 return true; 132 } else { 133 return false; 134 } 135 } 136 137 // Check if 'option' matches 'name'. No "tail" is allowed. 138 static bool match_option(const JavaVMOption *option, const char* name) { 139 const char* tail = NULL; 140 bool result = match_option(option, name, &tail); 141 if (tail != NULL && *tail == '\0') { 142 return result; 143 } else { 144 return false; 145 } 146 } 147 148 // Return true if any of the strings in null-terminated array 'names' matches. 149 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 150 // the option must match exactly. 151 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 152 bool tail_allowed) { 153 for (/* empty */; *names != NULL; ++names) { 154 if (match_option(option, *names, tail)) { 155 if (**tail == '\0' || tail_allowed && **tail == ':') { 156 return true; 157 } 158 } 159 } 160 return false; 161 } 162 163 static void logOption(const char* opt) { 164 if (PrintVMOptions) { 165 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 166 } 167 } 168 169 // Process java launcher properties. 170 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 171 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 172 // sun.java.launcher.pid is defined. 173 // Must do this before setting up other system properties, 174 // as some of them may depend on launcher type. 175 for (int index = 0; index < args->nOptions; index++) { 176 const JavaVMOption* option = args->options + index; 177 const char* tail; 178 179 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 180 process_java_launcher_argument(tail, option->extraInfo); 181 continue; 182 } 183 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 184 if (strcmp(tail, "true") == 0) { 185 _sun_java_launcher_is_altjvm = true; 186 } 187 continue; 188 } 189 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 190 _sun_java_launcher_pid = atoi(tail); 191 continue; 192 } 193 } 194 } 195 196 // Initialize system properties key and value. 197 void Arguments::init_system_properties() { 198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 199 "Java Virtual Machine Specification", false)); 200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 201 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 202 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 203 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 204 205 // Following are JVMTI agent writable properties. 206 // Properties values are set to NULL and they are 207 // os specific they are initialized in os::init_system_properties_values(). 208 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 209 _java_library_path = new SystemProperty("java.library.path", NULL, true); 210 _java_home = new SystemProperty("java.home", NULL, true); 211 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 212 213 _java_class_path = new SystemProperty("java.class.path", "", true); 214 215 // Add to System Property list. 216 PropertyList_add(&_system_properties, _sun_boot_library_path); 217 PropertyList_add(&_system_properties, _java_library_path); 218 PropertyList_add(&_system_properties, _java_home); 219 PropertyList_add(&_system_properties, _java_class_path); 220 PropertyList_add(&_system_properties, _sun_boot_class_path); 221 222 // Set OS specific system properties values 223 os::init_system_properties_values(); 224 225 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);) 226 } 227 228 // Update/Initialize System properties after JDK version number is known 229 void Arguments::init_version_specific_system_properties() { 230 enum { bufsz = 16 }; 231 char buffer[bufsz]; 232 const char* spec_vendor = "Oracle Corporation"; 233 uint32_t spec_version = JDK_Version::current().major_version(); 234 235 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 236 237 PropertyList_add(&_system_properties, 238 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 239 PropertyList_add(&_system_properties, 240 new SystemProperty("java.vm.specification.version", buffer, false)); 241 PropertyList_add(&_system_properties, 242 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 243 } 244 245 /* 246 * -XX argument processing: 247 * 248 * -XX arguments are defined in several places, such as: 249 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 250 * -XX arguments are parsed in parse_argument(). 251 * -XX argument bounds checking is done in check_vm_args_consistency(). 252 * 253 * Over time -XX arguments may change. There are mechanisms to handle common cases: 254 * 255 * ALIASED: An option that is simply another name for another option. This is often 256 * part of the process of deprecating a flag, but not all aliases need 257 * to be deprecated. 258 * 259 * Create an alias for an option by adding the old and new option names to the 260 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 261 * 262 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 263 * support may be removed in the future. Both regular and aliased options may be 264 * deprecated. 265 * 266 * Add a deprecation warning for an option (or alias) by adding an entry in the 267 * "special_jvm_flags" table and setting the "deprecated_in" field. 268 * Often an option "deprecated" in one major release will 269 * be made "obsolete" in the next. In this case the entry should also have it's 270 * "obsolete_in" field set. 271 * 272 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 273 * on the command line. A warning is printed to let the user know that option might not 274 * be accepted in the future. 275 * 276 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 277 * table and setting the "obsolete_in" field. 278 * 279 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 280 * to the current JDK version. The system will flatly refuse to admit the existence of 281 * the flag. This allows a flag to die automatically over JDK releases. 282 * 283 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 284 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 285 * - Newly obsolete or expired deprecated options should have their global variable 286 * definitions removed (from globals.hpp, etc) and related implementations removed. 287 * 288 * Recommended approach for removing options: 289 * 290 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 291 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 292 * 293 * To remove internal options (e.g. diagnostic, experimental, develop options), use 294 * a 2-step model adding major release numbers to the obsolete and expire columns. 295 * 296 * To change the name of an option, use the alias table as well as a 2-step 297 * model adding major release numbers to the deprecate and expire columns. 298 * Think twice about aliasing commonly used customer options. 299 * 300 * There are times when it is appropriate to leave a future release number as undefined. 301 * 302 * Tests: Aliases should be tested in VMAliasOptions.java. 303 * Deprecated options should be tested in VMDeprecatedOptions.java. 304 */ 305 306 // Obsolete or deprecated -XX flag. 307 typedef struct { 308 const char* name; 309 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined"). 310 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined"). 311 JDK_Version expired_in; // When the option expires (or "undefined"). 312 } SpecialFlag; 313 314 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 315 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 316 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 317 // the command-line as usual, but will issue a warning. 318 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 319 // the command-line, while issuing a warning and ignoring the flag value. 320 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 321 // existence of the flag. 322 // 323 // MANUAL CLEANUP ON JDK VERSION UPDATES: 324 // This table ensures that the handling of options will update automatically when the JDK 325 // version is incremented, but the source code needs to be cleanup up manually: 326 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 327 // variable should be removed, as well as users of the variable. 328 // - As "deprecated" options age into "obsolete" options, move the entry into the 329 // "Obsolete Flags" section of the table. 330 // - All expired options should be removed from the table. 331 static SpecialFlag const special_jvm_flags[] = { 332 // -------------- Deprecated Flags -------------- 333 // --- Non-alias flags - sorted by obsolete_in then expired_in: 334 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 335 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 336 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 337 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 338 339 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 340 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 341 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 342 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 343 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 344 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 345 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 346 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 347 348 // -------------- Obsolete Flags - sorted by expired_in -------------- 349 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 350 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 351 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 352 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 353 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 354 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 355 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 356 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 357 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 358 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 359 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 360 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 361 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 362 #ifndef ZERO 363 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 364 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 365 #endif // ZERO 366 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 367 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 368 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 369 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 370 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 371 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 372 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 373 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 374 { "UseAltSigs", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 375 { "SegmentedHeapDumpThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 376 377 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 378 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 379 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 380 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 381 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 382 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 383 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 384 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 385 #endif 386 387 { NULL, JDK_Version(0), JDK_Version(0) } 388 }; 389 390 // Flags that are aliases for other flags. 391 typedef struct { 392 const char* alias_name; 393 const char* real_name; 394 } AliasedFlag; 395 396 static AliasedFlag const aliased_jvm_flags[] = { 397 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 398 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 399 { "CMSMarkStackSize", "MarkStackSize" }, 400 { "G1MarkStackSize", "MarkStackSize" }, 401 { "ParallelMarkingThreads", "ConcGCThreads" }, 402 { "ParallelCMSThreads", "ConcGCThreads" }, 403 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 404 { NULL, NULL} 405 }; 406 407 static AliasedLoggingFlag const aliased_logging_flags[] = { 408 { "TraceClassLoading", LogLevel::Info, true, LogTag::_classload }, 409 { "TraceClassPaths", LogLevel::Info, true, LogTag::_classpath }, 410 { "TraceClassResolution", LogLevel::Info, true, LogTag::_classresolve }, 411 { "TraceClassUnloading", LogLevel::Info, true, LogTag::_classunload }, 412 { "TraceExceptions", LogLevel::Info, true, LogTag::_exceptions }, 413 { "TraceMonitorInflation", LogLevel::Debug, true, LogTag::_monitorinflation }, 414 { "TraceBiasedLocking", LogLevel::Info, true, LogTag::_biasedlocking }, 415 { NULL, LogLevel::Off, false, LogTag::__NO_TAG } 416 }; 417 418 // Return true if "v" is less than "other", where "other" may be "undefined". 419 static bool version_less_than(JDK_Version v, JDK_Version other) { 420 assert(!v.is_undefined(), "must be defined"); 421 if (!other.is_undefined() && v.compare(other) >= 0) { 422 return false; 423 } else { 424 return true; 425 } 426 } 427 428 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 429 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 430 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 431 flag = special_jvm_flags[i]; 432 return true; 433 } 434 } 435 return false; 436 } 437 438 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 439 assert(version != NULL, "Must provide a version buffer"); 440 SpecialFlag flag; 441 if (lookup_special_flag(flag_name, flag)) { 442 if (!flag.obsolete_in.is_undefined()) { 443 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 444 *version = flag.obsolete_in; 445 return true; 446 } 447 } 448 } 449 return false; 450 } 451 452 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 453 assert(version != NULL, "Must provide a version buffer"); 454 SpecialFlag flag; 455 if (lookup_special_flag(flag_name, flag)) { 456 if (!flag.deprecated_in.is_undefined()) { 457 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 458 version_less_than(JDK_Version::current(), flag.expired_in)) { 459 *version = flag.deprecated_in; 460 return 1; 461 } else { 462 return -1; 463 } 464 } 465 } 466 return 0; 467 } 468 469 const char* Arguments::real_flag_name(const char *flag_name) { 470 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 471 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 472 if (strcmp(flag_status.alias_name, flag_name) == 0) { 473 return flag_status.real_name; 474 } 475 } 476 return flag_name; 477 } 478 479 #ifdef ASSERT 480 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 481 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 482 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 483 return true; 484 } 485 } 486 return false; 487 } 488 489 static bool verify_special_jvm_flags() { 490 bool success = true; 491 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 492 const SpecialFlag& flag = special_jvm_flags[i]; 493 if (lookup_special_flag(flag.name, i)) { 494 warning("Duplicate special flag declaration \"%s\"", flag.name); 495 success = false; 496 } 497 if (flag.deprecated_in.is_undefined() && 498 flag.obsolete_in.is_undefined()) { 499 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 500 success = false; 501 } 502 503 if (!flag.deprecated_in.is_undefined()) { 504 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 505 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 506 success = false; 507 } 508 509 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 510 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 511 success = false; 512 } 513 } 514 515 if (!flag.obsolete_in.is_undefined()) { 516 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 517 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 518 success = false; 519 } 520 521 // if flag has become obsolete it should not have a "globals" flag defined anymore. 522 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 523 if (Flag::find_flag(flag.name) != NULL) { 524 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 525 success = false; 526 } 527 } 528 } 529 530 if (!flag.expired_in.is_undefined()) { 531 // if flag has become expired it should not have a "globals" flag defined anymore. 532 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 533 if (Flag::find_flag(flag.name) != NULL) { 534 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 535 success = false; 536 } 537 } 538 } 539 540 } 541 return success; 542 } 543 #endif 544 545 // Constructs the system class path (aka boot class path) from the following 546 // components, in order: 547 // 548 // prefix // from -Xbootclasspath/p:... 549 // base // from os::get_system_properties() or -Xbootclasspath= 550 // suffix // from -Xbootclasspath/a:... 551 // 552 // This could be AllStatic, but it isn't needed after argument processing is 553 // complete. 554 class SysClassPath: public StackObj { 555 public: 556 SysClassPath(const char* base); 557 ~SysClassPath(); 558 559 inline void set_base(const char* base); 560 inline void add_prefix(const char* prefix); 561 inline void add_suffix_to_prefix(const char* suffix); 562 inline void add_suffix(const char* suffix); 563 inline void reset_path(const char* base); 564 565 inline const char* get_base() const { return _items[_scp_base]; } 566 inline const char* get_prefix() const { return _items[_scp_prefix]; } 567 inline const char* get_suffix() const { return _items[_scp_suffix]; } 568 569 // Combine all the components into a single c-heap-allocated string; caller 570 // must free the string if/when no longer needed. 571 char* combined_path(); 572 573 private: 574 // Utility routines. 575 static char* add_to_path(const char* path, const char* str, bool prepend); 576 static char* add_jars_to_path(char* path, const char* directory); 577 578 inline void reset_item_at(int index); 579 580 // Array indices for the items that make up the sysclasspath. All except the 581 // base are allocated in the C heap and freed by this class. 582 enum { 583 _scp_prefix, // from -Xbootclasspath/p:... 584 _scp_base, // the default sysclasspath 585 _scp_suffix, // from -Xbootclasspath/a:... 586 _scp_nitems // the number of items, must be last. 587 }; 588 589 const char* _items[_scp_nitems]; 590 }; 591 592 SysClassPath::SysClassPath(const char* base) { 593 memset(_items, 0, sizeof(_items)); 594 _items[_scp_base] = base; 595 } 596 597 SysClassPath::~SysClassPath() { 598 // Free everything except the base. 599 for (int i = 0; i < _scp_nitems; ++i) { 600 if (i != _scp_base) reset_item_at(i); 601 } 602 } 603 604 inline void SysClassPath::set_base(const char* base) { 605 _items[_scp_base] = base; 606 } 607 608 inline void SysClassPath::add_prefix(const char* prefix) { 609 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 610 } 611 612 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 613 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 614 } 615 616 inline void SysClassPath::add_suffix(const char* suffix) { 617 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 618 } 619 620 inline void SysClassPath::reset_item_at(int index) { 621 assert(index < _scp_nitems && index != _scp_base, "just checking"); 622 if (_items[index] != NULL) { 623 FREE_C_HEAP_ARRAY(char, _items[index]); 624 _items[index] = NULL; 625 } 626 } 627 628 inline void SysClassPath::reset_path(const char* base) { 629 // Clear the prefix and suffix. 630 reset_item_at(_scp_prefix); 631 reset_item_at(_scp_suffix); 632 set_base(base); 633 } 634 635 //------------------------------------------------------------------------------ 636 637 638 // Combine the bootclasspath elements, some of which may be null, into a single 639 // c-heap-allocated string. 640 char* SysClassPath::combined_path() { 641 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 642 643 size_t lengths[_scp_nitems]; 644 size_t total_len = 0; 645 646 const char separator = *os::path_separator(); 647 648 // Get the lengths. 649 int i; 650 for (i = 0; i < _scp_nitems; ++i) { 651 if (_items[i] != NULL) { 652 lengths[i] = strlen(_items[i]); 653 // Include space for the separator char (or a NULL for the last item). 654 total_len += lengths[i] + 1; 655 } 656 } 657 assert(total_len > 0, "empty sysclasspath not allowed"); 658 659 // Copy the _items to a single string. 660 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 661 char* cp_tmp = cp; 662 for (i = 0; i < _scp_nitems; ++i) { 663 if (_items[i] != NULL) { 664 memcpy(cp_tmp, _items[i], lengths[i]); 665 cp_tmp += lengths[i]; 666 *cp_tmp++ = separator; 667 } 668 } 669 *--cp_tmp = '\0'; // Replace the extra separator. 670 return cp; 671 } 672 673 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 674 char* 675 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 676 char *cp; 677 678 assert(str != NULL, "just checking"); 679 if (path == NULL) { 680 size_t len = strlen(str) + 1; 681 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 682 memcpy(cp, str, len); // copy the trailing null 683 } else { 684 const char separator = *os::path_separator(); 685 size_t old_len = strlen(path); 686 size_t str_len = strlen(str); 687 size_t len = old_len + str_len + 2; 688 689 if (prepend) { 690 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 691 char* cp_tmp = cp; 692 memcpy(cp_tmp, str, str_len); 693 cp_tmp += str_len; 694 *cp_tmp = separator; 695 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 696 FREE_C_HEAP_ARRAY(char, path); 697 } else { 698 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 699 char* cp_tmp = cp + old_len; 700 *cp_tmp = separator; 701 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 702 } 703 } 704 return cp; 705 } 706 707 // Scan the directory and append any jar or zip files found to path. 708 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 709 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 710 DIR* dir = os::opendir(directory); 711 if (dir == NULL) return path; 712 713 char dir_sep[2] = { '\0', '\0' }; 714 size_t directory_len = strlen(directory); 715 const char fileSep = *os::file_separator(); 716 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 717 718 /* Scan the directory for jars/zips, appending them to path. */ 719 struct dirent *entry; 720 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 721 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 722 const char* name = entry->d_name; 723 const char* ext = name + strlen(name) - 4; 724 bool isJarOrZip = ext > name && 725 (os::file_name_strcmp(ext, ".jar") == 0 || 726 os::file_name_strcmp(ext, ".zip") == 0); 727 if (isJarOrZip) { 728 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 729 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 730 path = add_to_path(path, jarpath, false); 731 FREE_C_HEAP_ARRAY(char, jarpath); 732 } 733 } 734 FREE_C_HEAP_ARRAY(char, dbuf); 735 os::closedir(dir); 736 return path; 737 } 738 739 // Parses a memory size specification string. 740 static bool atomull(const char *s, julong* result) { 741 julong n = 0; 742 int args_read = 0; 743 bool is_hex = false; 744 // Skip leading 0[xX] for hexadecimal 745 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 746 s += 2; 747 is_hex = true; 748 args_read = sscanf(s, JULONG_FORMAT_X, &n); 749 } else { 750 args_read = sscanf(s, JULONG_FORMAT, &n); 751 } 752 if (args_read != 1) { 753 return false; 754 } 755 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 756 s++; 757 } 758 // 4705540: illegal if more characters are found after the first non-digit 759 if (strlen(s) > 1) { 760 return false; 761 } 762 switch (*s) { 763 case 'T': case 't': 764 *result = n * G * K; 765 // Check for overflow. 766 if (*result/((julong)G * K) != n) return false; 767 return true; 768 case 'G': case 'g': 769 *result = n * G; 770 if (*result/G != n) return false; 771 return true; 772 case 'M': case 'm': 773 *result = n * M; 774 if (*result/M != n) return false; 775 return true; 776 case 'K': case 'k': 777 *result = n * K; 778 if (*result/K != n) return false; 779 return true; 780 case '\0': 781 *result = n; 782 return true; 783 default: 784 return false; 785 } 786 } 787 788 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 789 if (size < min_size) return arg_too_small; 790 // Check that size will fit in a size_t (only relevant on 32-bit) 791 if (size > max_uintx) return arg_too_big; 792 return arg_in_range; 793 } 794 795 // Describe an argument out of range error 796 void Arguments::describe_range_error(ArgsRange errcode) { 797 switch(errcode) { 798 case arg_too_big: 799 jio_fprintf(defaultStream::error_stream(), 800 "The specified size exceeds the maximum " 801 "representable size.\n"); 802 break; 803 case arg_too_small: 804 case arg_unreadable: 805 case arg_in_range: 806 // do nothing for now 807 break; 808 default: 809 ShouldNotReachHere(); 810 } 811 } 812 813 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 814 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 815 return true; 816 } else { 817 return false; 818 } 819 } 820 821 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 822 char* end; 823 errno = 0; 824 double v = strtod(value, &end); 825 if ((errno != 0) || (*end != 0)) { 826 return false; 827 } 828 829 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 830 return true; 831 } 832 return false; 833 } 834 835 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 836 julong v; 837 int int_v; 838 intx intx_v; 839 bool is_neg = false; 840 Flag* result = Flag::find_flag(name, strlen(name)); 841 842 if (result == NULL) { 843 return false; 844 } 845 846 // Check the sign first since atomull() parses only unsigned values. 847 if (*value == '-') { 848 if (!result->is_intx() && !result->is_int()) { 849 return false; 850 } 851 value++; 852 is_neg = true; 853 } 854 if (!atomull(value, &v)) { 855 return false; 856 } 857 if (result->is_int()) { 858 int_v = (int) v; 859 if (is_neg) { 860 int_v = -int_v; 861 } 862 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 863 } else if (result->is_uint()) { 864 uint uint_v = (uint) v; 865 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 866 } else if (result->is_intx()) { 867 intx_v = (intx) v; 868 if (is_neg) { 869 intx_v = -intx_v; 870 } 871 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 872 } else if (result->is_uintx()) { 873 uintx uintx_v = (uintx) v; 874 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 875 } else if (result->is_uint64_t()) { 876 uint64_t uint64_t_v = (uint64_t) v; 877 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 878 } else if (result->is_size_t()) { 879 size_t size_t_v = (size_t) v; 880 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 881 } else { 882 return false; 883 } 884 } 885 886 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 887 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 888 // Contract: CommandLineFlags always returns a pointer that needs freeing. 889 FREE_C_HEAP_ARRAY(char, value); 890 return true; 891 } 892 893 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 894 const char* old_value = ""; 895 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 896 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 897 size_t new_len = strlen(new_value); 898 const char* value; 899 char* free_this_too = NULL; 900 if (old_len == 0) { 901 value = new_value; 902 } else if (new_len == 0) { 903 value = old_value; 904 } else { 905 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 906 // each new setting adds another LINE to the switch: 907 sprintf(buf, "%s\n%s", old_value, new_value); 908 value = buf; 909 free_this_too = buf; 910 } 911 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 912 // CommandLineFlags always returns a pointer that needs freeing. 913 FREE_C_HEAP_ARRAY(char, value); 914 if (free_this_too != NULL) { 915 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 916 FREE_C_HEAP_ARRAY(char, free_this_too); 917 } 918 return true; 919 } 920 921 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 922 const char* real_name = real_flag_name(arg); 923 JDK_Version since = JDK_Version(); 924 switch (is_deprecated_flag(arg, &since)) { 925 case -1: 926 return NULL; // obsolete or expired, don't process normally 927 case 0: 928 return real_name; 929 case 1: { 930 if (warn) { 931 char version[256]; 932 since.to_string(version, sizeof(version)); 933 if (real_name != arg) { 934 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 935 arg, version, real_name); 936 } else { 937 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 938 arg, version); 939 } 940 } 941 return real_name; 942 } 943 } 944 ShouldNotReachHere(); 945 return NULL; 946 } 947 948 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name){ 949 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 950 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 951 if (strcmp(alf.alias_name, name) == 0) { 952 return alf; 953 } 954 } 955 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LogTag::__NO_TAG}; 956 return a; 957 } 958 959 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 960 961 // range of acceptable characters spelled out for portability reasons 962 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 963 #define BUFLEN 255 964 char name[BUFLEN+1]; 965 char dummy; 966 const char* real_name; 967 bool warn_if_deprecated = true; 968 AliasedLoggingFlag alf; 969 970 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 971 alf = catch_logging_aliases(name); 972 if (alf.alias_name != NULL){ 973 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag, LogTag::__NO_TAG); 974 return true; 975 } 976 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 977 if (real_name == NULL) { 978 return false; 979 } 980 return set_bool_flag(real_name, false, origin); 981 } 982 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 983 alf = catch_logging_aliases(name); 984 if (alf.alias_name != NULL){ 985 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag, LogTag::__NO_TAG); 986 return true; 987 } 988 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 989 if (real_name == NULL) { 990 return false; 991 } 992 return set_bool_flag(real_name, true, origin); 993 } 994 995 char punct; 996 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 997 const char* value = strchr(arg, '=') + 1; 998 Flag* flag; 999 1000 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1001 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1002 if (real_name == NULL) { 1003 return false; 1004 } 1005 flag = Flag::find_flag(real_name); 1006 if (flag != NULL && flag->is_ccstr()) { 1007 if (flag->ccstr_accumulates()) { 1008 return append_to_string_flag(real_name, value, origin); 1009 } else { 1010 if (value[0] == '\0') { 1011 value = NULL; 1012 } 1013 return set_string_flag(real_name, value, origin); 1014 } 1015 } else { 1016 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1017 } 1018 } 1019 1020 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1021 const char* value = strchr(arg, '=') + 1; 1022 // -XX:Foo:=xxx will reset the string flag to the given value. 1023 if (value[0] == '\0') { 1024 value = NULL; 1025 } 1026 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1027 if (real_name == NULL) { 1028 return false; 1029 } 1030 return set_string_flag(real_name, value, origin); 1031 } 1032 1033 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1034 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1035 #define NUMBER_RANGE "[0123456789eE+-]" 1036 char value[BUFLEN + 1]; 1037 char value2[BUFLEN + 1]; 1038 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1039 // Looks like a floating-point number -- try again with more lenient format string 1040 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1041 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1042 if (real_name == NULL) { 1043 return false; 1044 } 1045 return set_fp_numeric_flag(real_name, value, origin); 1046 } 1047 } 1048 1049 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1050 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1051 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1052 if (real_name == NULL) { 1053 return false; 1054 } 1055 return set_numeric_flag(real_name, value, origin); 1056 } 1057 1058 return false; 1059 } 1060 1061 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1062 assert(bldarray != NULL, "illegal argument"); 1063 1064 if (arg == NULL) { 1065 return; 1066 } 1067 1068 int new_count = *count + 1; 1069 1070 // expand the array and add arg to the last element 1071 if (*bldarray == NULL) { 1072 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 1073 } else { 1074 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 1075 } 1076 (*bldarray)[*count] = os::strdup_check_oom(arg); 1077 *count = new_count; 1078 } 1079 1080 void Arguments::build_jvm_args(const char* arg) { 1081 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1082 } 1083 1084 void Arguments::build_jvm_flags(const char* arg) { 1085 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1086 } 1087 1088 // utility function to return a string that concatenates all 1089 // strings in a given char** array 1090 const char* Arguments::build_resource_string(char** args, int count) { 1091 if (args == NULL || count == 0) { 1092 return NULL; 1093 } 1094 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 1095 for (int i = 1; i < count; i++) { 1096 length += strlen(args[i]) + 1; // add 1 for a space 1097 } 1098 char* s = NEW_RESOURCE_ARRAY(char, length); 1099 strcpy(s, args[0]); 1100 for (int j = 1; j < count; j++) { 1101 strcat(s, " "); 1102 strcat(s, args[j]); 1103 } 1104 return (const char*) s; 1105 } 1106 1107 void Arguments::print_on(outputStream* st) { 1108 st->print_cr("VM Arguments:"); 1109 if (num_jvm_flags() > 0) { 1110 st->print("jvm_flags: "); print_jvm_flags_on(st); 1111 st->cr(); 1112 } 1113 if (num_jvm_args() > 0) { 1114 st->print("jvm_args: "); print_jvm_args_on(st); 1115 st->cr(); 1116 } 1117 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1118 if (_java_class_path != NULL) { 1119 char* path = _java_class_path->value(); 1120 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1121 } 1122 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1123 } 1124 1125 void Arguments::print_summary_on(outputStream* st) { 1126 // Print the command line. Environment variables that are helpful for 1127 // reproducing the problem are written later in the hs_err file. 1128 // flags are from setting file 1129 if (num_jvm_flags() > 0) { 1130 st->print_raw("Settings File: "); 1131 print_jvm_flags_on(st); 1132 st->cr(); 1133 } 1134 // args are the command line and environment variable arguments. 1135 st->print_raw("Command Line: "); 1136 if (num_jvm_args() > 0) { 1137 print_jvm_args_on(st); 1138 } 1139 // this is the classfile and any arguments to the java program 1140 if (java_command() != NULL) { 1141 st->print("%s", java_command()); 1142 } 1143 st->cr(); 1144 } 1145 1146 void Arguments::print_jvm_flags_on(outputStream* st) { 1147 if (_num_jvm_flags > 0) { 1148 for (int i=0; i < _num_jvm_flags; i++) { 1149 st->print("%s ", _jvm_flags_array[i]); 1150 } 1151 } 1152 } 1153 1154 void Arguments::print_jvm_args_on(outputStream* st) { 1155 if (_num_jvm_args > 0) { 1156 for (int i=0; i < _num_jvm_args; i++) { 1157 st->print("%s ", _jvm_args_array[i]); 1158 } 1159 } 1160 } 1161 1162 bool Arguments::process_argument(const char* arg, 1163 jboolean ignore_unrecognized, 1164 Flag::Flags origin) { 1165 JDK_Version since = JDK_Version(); 1166 1167 if (parse_argument(arg, origin)) { 1168 return true; 1169 } 1170 1171 // Determine if the flag has '+', '-', or '=' characters. 1172 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1173 const char* const argname = has_plus_minus ? arg + 1 : arg; 1174 1175 size_t arg_len; 1176 const char* equal_sign = strchr(argname, '='); 1177 if (equal_sign == NULL) { 1178 arg_len = strlen(argname); 1179 } else { 1180 arg_len = equal_sign - argname; 1181 } 1182 1183 // Only make the obsolete check for valid arguments. 1184 if (arg_len <= BUFLEN) { 1185 // Construct a string which consists only of the argument name without '+', '-', or '='. 1186 char stripped_argname[BUFLEN+1]; 1187 strncpy(stripped_argname, argname, arg_len); 1188 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate. 1189 1190 if (is_obsolete_flag(stripped_argname, &since)) { 1191 char version[256]; 1192 since.to_string(version, sizeof(version)); 1193 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1194 return true; 1195 } 1196 } 1197 1198 // For locked flags, report a custom error message if available. 1199 // Otherwise, report the standard unrecognized VM option. 1200 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1201 if (found_flag != NULL) { 1202 char locked_message_buf[BUFLEN]; 1203 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1204 if (strlen(locked_message_buf) == 0) { 1205 if (found_flag->is_bool() && !has_plus_minus) { 1206 jio_fprintf(defaultStream::error_stream(), 1207 "Missing +/- setting for VM option '%s'\n", argname); 1208 } else if (!found_flag->is_bool() && has_plus_minus) { 1209 jio_fprintf(defaultStream::error_stream(), 1210 "Unexpected +/- setting in VM option '%s'\n", argname); 1211 } else { 1212 jio_fprintf(defaultStream::error_stream(), 1213 "Improperly specified VM option '%s'\n", argname); 1214 } 1215 } else { 1216 #ifdef PRODUCT 1217 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1218 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1219 if (ignore_unrecognized && mismatched) { 1220 return true; 1221 } 1222 #endif 1223 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1224 } 1225 } else { 1226 if (ignore_unrecognized) { 1227 return true; 1228 } 1229 jio_fprintf(defaultStream::error_stream(), 1230 "Unrecognized VM option '%s'\n", argname); 1231 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1232 if (fuzzy_matched != NULL) { 1233 jio_fprintf(defaultStream::error_stream(), 1234 "Did you mean '%s%s%s'? ", 1235 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1236 fuzzy_matched->_name, 1237 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1238 } 1239 } 1240 1241 // allow for commandline "commenting out" options like -XX:#+Verbose 1242 return arg[0] == '#'; 1243 } 1244 1245 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1246 FILE* stream = fopen(file_name, "rb"); 1247 if (stream == NULL) { 1248 if (should_exist) { 1249 jio_fprintf(defaultStream::error_stream(), 1250 "Could not open settings file %s\n", file_name); 1251 return false; 1252 } else { 1253 return true; 1254 } 1255 } 1256 1257 char token[1024]; 1258 int pos = 0; 1259 1260 bool in_white_space = true; 1261 bool in_comment = false; 1262 bool in_quote = false; 1263 char quote_c = 0; 1264 bool result = true; 1265 1266 int c = getc(stream); 1267 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1268 if (in_white_space) { 1269 if (in_comment) { 1270 if (c == '\n') in_comment = false; 1271 } else { 1272 if (c == '#') in_comment = true; 1273 else if (!isspace(c)) { 1274 in_white_space = false; 1275 token[pos++] = c; 1276 } 1277 } 1278 } else { 1279 if (c == '\n' || (!in_quote && isspace(c))) { 1280 // token ends at newline, or at unquoted whitespace 1281 // this allows a way to include spaces in string-valued options 1282 token[pos] = '\0'; 1283 logOption(token); 1284 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1285 build_jvm_flags(token); 1286 pos = 0; 1287 in_white_space = true; 1288 in_quote = false; 1289 } else if (!in_quote && (c == '\'' || c == '"')) { 1290 in_quote = true; 1291 quote_c = c; 1292 } else if (in_quote && (c == quote_c)) { 1293 in_quote = false; 1294 } else { 1295 token[pos++] = c; 1296 } 1297 } 1298 c = getc(stream); 1299 } 1300 if (pos > 0) { 1301 token[pos] = '\0'; 1302 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1303 build_jvm_flags(token); 1304 } 1305 fclose(stream); 1306 return result; 1307 } 1308 1309 //============================================================================================================= 1310 // Parsing of properties (-D) 1311 1312 const char* Arguments::get_property(const char* key) { 1313 return PropertyList_get_value(system_properties(), key); 1314 } 1315 1316 bool Arguments::add_property(const char* prop) { 1317 const char* eq = strchr(prop, '='); 1318 const char* key; 1319 const char* value = ""; 1320 1321 if (eq == NULL) { 1322 // property doesn't have a value, thus use passed string 1323 key = prop; 1324 } else { 1325 // property have a value, thus extract it and save to the 1326 // allocated string 1327 size_t key_len = eq - prop; 1328 char* tmp_key = AllocateHeap(key_len + 1, mtInternal); 1329 1330 strncpy(tmp_key, prop, key_len); 1331 tmp_key[key_len] = '\0'; 1332 key = tmp_key; 1333 1334 value = &prop[key_len + 1]; 1335 } 1336 1337 if (strcmp(key, "java.compiler") == 0) { 1338 process_java_compiler_argument(value); 1339 // Record value in Arguments, but let it get passed to Java. 1340 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1341 strcmp(key, "sun.java.launcher.pid") == 0) { 1342 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1343 // private and are processed in process_sun_java_launcher_properties(); 1344 // the sun.java.launcher property is passed on to the java application 1345 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1346 PropertyList_unique_add(&_system_properties, key, value, true); 1347 } else { 1348 if (strcmp(key, "sun.java.command") == 0) { 1349 char *old_java_command = _java_command; 1350 _java_command = os::strdup_check_oom(value, mtInternal); 1351 if (old_java_command != NULL) { 1352 os::free(old_java_command); 1353 } 1354 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1355 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1356 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1357 // its value without going through the property list or making a Java call. 1358 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal); 1359 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1360 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1361 os::free((void *)old_java_vendor_url_bug); 1362 } 1363 } 1364 1365 // Create new property and add at the end of the list 1366 PropertyList_unique_add(&_system_properties, key, value); 1367 } 1368 1369 if (key != prop) { 1370 // SystemProperty copy passed value, thus free previously allocated 1371 // memory 1372 FreeHeap((void *)key); 1373 } 1374 1375 return true; 1376 } 1377 1378 //=========================================================================================================== 1379 // Setting int/mixed/comp mode flags 1380 1381 void Arguments::set_mode_flags(Mode mode) { 1382 // Set up default values for all flags. 1383 // If you add a flag to any of the branches below, 1384 // add a default value for it here. 1385 set_java_compiler(false); 1386 _mode = mode; 1387 1388 // Ensure Agent_OnLoad has the correct initial values. 1389 // This may not be the final mode; mode may change later in onload phase. 1390 PropertyList_unique_add(&_system_properties, "java.vm.info", 1391 VM_Version::vm_info_string(), false); 1392 1393 UseInterpreter = true; 1394 UseCompiler = true; 1395 UseLoopCounter = true; 1396 1397 // Default values may be platform/compiler dependent - 1398 // use the saved values 1399 ClipInlining = Arguments::_ClipInlining; 1400 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1401 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1402 BackgroundCompilation = Arguments::_BackgroundCompilation; 1403 if (TieredCompilation) { 1404 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1405 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1406 } 1407 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1408 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1409 } 1410 } 1411 1412 // Change from defaults based on mode 1413 switch (mode) { 1414 default: 1415 ShouldNotReachHere(); 1416 break; 1417 case _int: 1418 UseCompiler = false; 1419 UseLoopCounter = false; 1420 AlwaysCompileLoopMethods = false; 1421 UseOnStackReplacement = false; 1422 break; 1423 case _mixed: 1424 // same as default 1425 break; 1426 case _comp: 1427 UseInterpreter = false; 1428 BackgroundCompilation = false; 1429 ClipInlining = false; 1430 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1431 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1432 // compile a level 4 (C2) and then continue executing it. 1433 if (TieredCompilation) { 1434 Tier3InvokeNotifyFreqLog = 0; 1435 Tier4InvocationThreshold = 0; 1436 } 1437 break; 1438 } 1439 } 1440 1441 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS 1442 // Conflict: required to use shared spaces (-Xshare:on), but 1443 // incompatible command line options were chosen. 1444 1445 static void no_shared_spaces(const char* message) { 1446 if (RequireSharedSpaces) { 1447 jio_fprintf(defaultStream::error_stream(), 1448 "Class data sharing is inconsistent with other specified options.\n"); 1449 vm_exit_during_initialization("Unable to use shared archive.", message); 1450 } else { 1451 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1452 } 1453 } 1454 #endif 1455 1456 // Returns threshold scaled with the value of scale. 1457 // If scale < 0.0, threshold is returned without scaling. 1458 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1459 if (scale == 1.0 || scale < 0.0) { 1460 return threshold; 1461 } else { 1462 return (intx)(threshold * scale); 1463 } 1464 } 1465 1466 // Returns freq_log scaled with the value of scale. 1467 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1468 // If scale < 0.0, freq_log is returned without scaling. 1469 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1470 // Check if scaling is necessary or if negative value was specified. 1471 if (scale == 1.0 || scale < 0.0) { 1472 return freq_log; 1473 } 1474 // Check values to avoid calculating log2 of 0. 1475 if (scale == 0.0 || freq_log == 0) { 1476 return 0; 1477 } 1478 // Determine the maximum notification frequency value currently supported. 1479 // The largest mask value that the interpreter/C1 can handle is 1480 // of length InvocationCounter::number_of_count_bits. Mask values are always 1481 // one bit shorter then the value of the notification frequency. Set 1482 // max_freq_bits accordingly. 1483 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1484 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1485 if (scaled_freq == 0) { 1486 // Return 0 right away to avoid calculating log2 of 0. 1487 return 0; 1488 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1489 return max_freq_bits; 1490 } else { 1491 return log2_intptr(scaled_freq); 1492 } 1493 } 1494 1495 void Arguments::set_tiered_flags() { 1496 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1497 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1498 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1499 } 1500 if (CompilationPolicyChoice < 2) { 1501 vm_exit_during_initialization( 1502 "Incompatible compilation policy selected", NULL); 1503 } 1504 // Increase the code cache size - tiered compiles a lot more. 1505 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1506 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1507 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1508 } 1509 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1510 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1511 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1512 } 1513 if (!UseInterpreter) { // -Xcomp 1514 Tier3InvokeNotifyFreqLog = 0; 1515 Tier4InvocationThreshold = 0; 1516 } 1517 1518 if (CompileThresholdScaling < 0) { 1519 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1520 } 1521 1522 // Scale tiered compilation thresholds. 1523 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1524 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1525 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1526 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1527 1528 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1529 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1530 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1531 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1532 1533 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1534 // once these thresholds become supported. 1535 1536 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1537 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1538 1539 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1540 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1541 1542 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1543 1544 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1545 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1546 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1547 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1548 } 1549 } 1550 1551 #if INCLUDE_ALL_GCS 1552 static void disable_adaptive_size_policy(const char* collector_name) { 1553 if (UseAdaptiveSizePolicy) { 1554 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1555 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1556 collector_name); 1557 } 1558 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1559 } 1560 } 1561 1562 void Arguments::set_parnew_gc_flags() { 1563 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1564 "control point invariant"); 1565 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1566 assert(UseParNewGC, "ParNew should always be used with CMS"); 1567 1568 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1569 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1570 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1571 } else if (ParallelGCThreads == 0) { 1572 jio_fprintf(defaultStream::error_stream(), 1573 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1574 vm_exit(1); 1575 } 1576 1577 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1578 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1579 // we set them to 1024 and 1024. 1580 // See CR 6362902. 1581 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1582 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1583 } 1584 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1585 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1586 } 1587 1588 // When using compressed oops, we use local overflow stacks, 1589 // rather than using a global overflow list chained through 1590 // the klass word of the object's pre-image. 1591 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1592 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1593 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1594 } 1595 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1596 } 1597 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1598 } 1599 1600 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1601 // sparc/solaris for certain applications, but would gain from 1602 // further optimization and tuning efforts, and would almost 1603 // certainly gain from analysis of platform and environment. 1604 void Arguments::set_cms_and_parnew_gc_flags() { 1605 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1606 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1607 assert(UseParNewGC, "ParNew should always be used with CMS"); 1608 1609 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1610 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1611 1612 set_parnew_gc_flags(); 1613 1614 size_t max_heap = align_size_down(MaxHeapSize, 1615 CardTableRS::ct_max_alignment_constraint()); 1616 1617 // Now make adjustments for CMS 1618 intx tenuring_default = (intx)6; 1619 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1620 1621 // Preferred young gen size for "short" pauses: 1622 // upper bound depends on # of threads and NewRatio. 1623 const size_t preferred_max_new_size_unaligned = 1624 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1625 size_t preferred_max_new_size = 1626 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1627 1628 // Unless explicitly requested otherwise, size young gen 1629 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1630 1631 // If either MaxNewSize or NewRatio is set on the command line, 1632 // assume the user is trying to set the size of the young gen. 1633 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1634 1635 // Set MaxNewSize to our calculated preferred_max_new_size unless 1636 // NewSize was set on the command line and it is larger than 1637 // preferred_max_new_size. 1638 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1639 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1640 } else { 1641 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1642 } 1643 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1644 1645 // Code along this path potentially sets NewSize and OldSize 1646 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1647 min_heap_size(), InitialHeapSize, max_heap); 1648 size_t min_new = preferred_max_new_size; 1649 if (FLAG_IS_CMDLINE(NewSize)) { 1650 min_new = NewSize; 1651 } 1652 if (max_heap > min_new && min_heap_size() > min_new) { 1653 // Unless explicitly requested otherwise, make young gen 1654 // at least min_new, and at most preferred_max_new_size. 1655 if (FLAG_IS_DEFAULT(NewSize)) { 1656 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1657 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1658 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1659 } 1660 // Unless explicitly requested otherwise, size old gen 1661 // so it's NewRatio x of NewSize. 1662 if (FLAG_IS_DEFAULT(OldSize)) { 1663 if (max_heap > NewSize) { 1664 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1665 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1666 } 1667 } 1668 } 1669 } 1670 // Unless explicitly requested otherwise, definitely 1671 // promote all objects surviving "tenuring_default" scavenges. 1672 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1673 FLAG_IS_DEFAULT(SurvivorRatio)) { 1674 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1675 } 1676 // If we decided above (or user explicitly requested) 1677 // `promote all' (via MaxTenuringThreshold := 0), 1678 // prefer minuscule survivor spaces so as not to waste 1679 // space for (non-existent) survivors 1680 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1681 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1682 } 1683 1684 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1685 // but rather the number of free blocks of a given size that are used when 1686 // replenishing the local per-worker free list caches. 1687 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1688 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1689 // OldPLAB sizing manually turned off: Use a larger default setting, 1690 // unless it was manually specified. This is because a too-low value 1691 // will slow down scavenges. 1692 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1693 } else { 1694 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1695 } 1696 } 1697 1698 // If either of the static initialization defaults have changed, note this 1699 // modification. 1700 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1701 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1702 } 1703 1704 if (!ClassUnloading) { 1705 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1706 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1707 } 1708 1709 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1710 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads); 1711 } 1712 #endif // INCLUDE_ALL_GCS 1713 1714 void set_object_alignment() { 1715 // Object alignment. 1716 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1717 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1718 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1719 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1720 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1721 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1722 1723 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1724 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1725 1726 // Oop encoding heap max 1727 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1728 1729 if (SurvivorAlignmentInBytes == 0) { 1730 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1731 } 1732 1733 #if INCLUDE_ALL_GCS 1734 // Set CMS global values 1735 CompactibleFreeListSpace::set_cms_values(); 1736 #endif // INCLUDE_ALL_GCS 1737 } 1738 1739 size_t Arguments::max_heap_for_compressed_oops() { 1740 // Avoid sign flip. 1741 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1742 // We need to fit both the NULL page and the heap into the memory budget, while 1743 // keeping alignment constraints of the heap. To guarantee the latter, as the 1744 // NULL page is located before the heap, we pad the NULL page to the conservative 1745 // maximum alignment that the GC may ever impose upon the heap. 1746 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1747 _conservative_max_heap_alignment); 1748 1749 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1750 NOT_LP64(ShouldNotReachHere(); return 0); 1751 } 1752 1753 bool Arguments::should_auto_select_low_pause_collector() { 1754 if (UseAutoGCSelectPolicy && 1755 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1756 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1757 log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1758 return true; 1759 } 1760 return false; 1761 } 1762 1763 void Arguments::set_use_compressed_oops() { 1764 #ifndef ZERO 1765 #ifdef _LP64 1766 // MaxHeapSize is not set up properly at this point, but 1767 // the only value that can override MaxHeapSize if we are 1768 // to use UseCompressedOops is InitialHeapSize. 1769 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1770 1771 if (max_heap_size <= max_heap_for_compressed_oops()) { 1772 #if !defined(COMPILER1) || defined(TIERED) 1773 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1774 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1775 } 1776 #endif 1777 } else { 1778 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1779 warning("Max heap size too large for Compressed Oops"); 1780 FLAG_SET_DEFAULT(UseCompressedOops, false); 1781 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1782 } 1783 } 1784 #endif // _LP64 1785 #endif // ZERO 1786 } 1787 1788 1789 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1790 // set_use_compressed_oops(). 1791 void Arguments::set_use_compressed_klass_ptrs() { 1792 #ifndef ZERO 1793 #ifdef _LP64 1794 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1795 if (!UseCompressedOops) { 1796 if (UseCompressedClassPointers) { 1797 warning("UseCompressedClassPointers requires UseCompressedOops"); 1798 } 1799 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1800 } else { 1801 // Turn on UseCompressedClassPointers too 1802 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1803 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1804 } 1805 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1806 if (UseCompressedClassPointers) { 1807 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1808 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1809 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1810 } 1811 } 1812 } 1813 #endif // _LP64 1814 #endif // !ZERO 1815 } 1816 1817 void Arguments::set_conservative_max_heap_alignment() { 1818 // The conservative maximum required alignment for the heap is the maximum of 1819 // the alignments imposed by several sources: any requirements from the heap 1820 // itself, the collector policy and the maximum page size we may run the VM 1821 // with. 1822 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1823 #if INCLUDE_ALL_GCS 1824 if (UseParallelGC) { 1825 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1826 } else if (UseG1GC) { 1827 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1828 } 1829 #endif // INCLUDE_ALL_GCS 1830 _conservative_max_heap_alignment = MAX4(heap_alignment, 1831 (size_t)os::vm_allocation_granularity(), 1832 os::max_page_size(), 1833 CollectorPolicy::compute_heap_alignment()); 1834 } 1835 1836 void Arguments::select_gc_ergonomically() { 1837 if (os::is_server_class_machine()) { 1838 if (should_auto_select_low_pause_collector()) { 1839 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1840 } else { 1841 #if defined(JAVASE_EMBEDDED) 1842 FLAG_SET_ERGO(bool, UseParallelGC, true); 1843 #else 1844 FLAG_SET_ERGO(bool, UseG1GC, true); 1845 #endif 1846 } 1847 } else { 1848 FLAG_SET_ERGO(bool, UseSerialGC, true); 1849 } 1850 } 1851 1852 void Arguments::select_gc() { 1853 if (!gc_selected()) { 1854 select_gc_ergonomically(); 1855 guarantee(gc_selected(), "No GC selected"); 1856 } 1857 } 1858 1859 void Arguments::set_ergonomics_flags() { 1860 select_gc(); 1861 1862 #if defined(COMPILER2) || INCLUDE_JVMCI 1863 // Shared spaces work fine with other GCs but causes bytecode rewriting 1864 // to be disabled, which hurts interpreter performance and decreases 1865 // server performance. When -server is specified, keep the default off 1866 // unless it is asked for. Future work: either add bytecode rewriting 1867 // at link time, or rewrite bytecodes in non-shared methods. 1868 if (!DumpSharedSpaces && !RequireSharedSpaces && 1869 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1870 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1871 } 1872 #endif 1873 1874 set_conservative_max_heap_alignment(); 1875 1876 #ifndef ZERO 1877 #ifdef _LP64 1878 set_use_compressed_oops(); 1879 1880 // set_use_compressed_klass_ptrs() must be called after calling 1881 // set_use_compressed_oops(). 1882 set_use_compressed_klass_ptrs(); 1883 1884 // Also checks that certain machines are slower with compressed oops 1885 // in vm_version initialization code. 1886 #endif // _LP64 1887 #endif // !ZERO 1888 1889 CodeCacheExtensions::set_ergonomics_flags(); 1890 } 1891 1892 void Arguments::set_parallel_gc_flags() { 1893 assert(UseParallelGC || UseParallelOldGC, "Error"); 1894 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1895 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1896 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1897 } 1898 FLAG_SET_DEFAULT(UseParallelGC, true); 1899 1900 // If no heap maximum was requested explicitly, use some reasonable fraction 1901 // of the physical memory, up to a maximum of 1GB. 1902 FLAG_SET_DEFAULT(ParallelGCThreads, 1903 Abstract_VM_Version::parallel_worker_threads()); 1904 if (ParallelGCThreads == 0) { 1905 jio_fprintf(defaultStream::error_stream(), 1906 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1907 vm_exit(1); 1908 } 1909 1910 if (UseAdaptiveSizePolicy) { 1911 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1912 // unless the user actually sets these flags. 1913 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1914 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1915 } 1916 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1917 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1918 } 1919 } 1920 1921 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1922 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1923 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1924 // See CR 6362902 for details. 1925 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1926 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1927 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1928 } 1929 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1930 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1931 } 1932 } 1933 1934 if (UseParallelOldGC) { 1935 // Par compact uses lower default values since they are treated as 1936 // minimums. These are different defaults because of the different 1937 // interpretation and are not ergonomically set. 1938 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1939 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1940 } 1941 } 1942 } 1943 1944 void Arguments::set_g1_gc_flags() { 1945 assert(UseG1GC, "Error"); 1946 #if defined(COMPILER1) || INCLUDE_JVMCI 1947 FastTLABRefill = false; 1948 #endif 1949 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1950 if (ParallelGCThreads == 0) { 1951 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1952 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1953 } 1954 1955 #if INCLUDE_ALL_GCS 1956 if (G1ConcRefinementThreads == 0) { 1957 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1958 } 1959 #endif 1960 1961 // MarkStackSize will be set (if it hasn't been set by the user) 1962 // when concurrent marking is initialized. 1963 // Its value will be based upon the number of parallel marking threads. 1964 // But we do set the maximum mark stack size here. 1965 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1966 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1967 } 1968 1969 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1970 // In G1, we want the default GC overhead goal to be higher than 1971 // it is for PS, or the heap might be expanded too aggressively. 1972 // We set it here to ~8%. 1973 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1974 } 1975 1976 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1977 log_trace(gc)("ConcGCThreads: %u", ConcGCThreads); 1978 } 1979 1980 #if !INCLUDE_ALL_GCS 1981 #ifdef ASSERT 1982 static bool verify_serial_gc_flags() { 1983 return (UseSerialGC && 1984 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1985 UseParallelGC || UseParallelOldGC)); 1986 } 1987 #endif // ASSERT 1988 #endif // INCLUDE_ALL_GCS 1989 1990 void Arguments::set_gc_specific_flags() { 1991 #if INCLUDE_ALL_GCS 1992 // Set per-collector flags 1993 if (UseParallelGC || UseParallelOldGC) { 1994 set_parallel_gc_flags(); 1995 } else if (UseConcMarkSweepGC) { 1996 set_cms_and_parnew_gc_flags(); 1997 } else if (UseG1GC) { 1998 set_g1_gc_flags(); 1999 } 2000 if (AssumeMP && !UseSerialGC) { 2001 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2002 warning("If the number of processors is expected to increase from one, then" 2003 " you should configure the number of parallel GC threads appropriately" 2004 " using -XX:ParallelGCThreads=N"); 2005 } 2006 } 2007 if (MinHeapFreeRatio == 100) { 2008 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2009 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2010 } 2011 #else // INCLUDE_ALL_GCS 2012 assert(verify_serial_gc_flags(), "SerialGC unset"); 2013 #endif // INCLUDE_ALL_GCS 2014 } 2015 2016 julong Arguments::limit_by_allocatable_memory(julong limit) { 2017 julong max_allocatable; 2018 julong result = limit; 2019 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2020 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2021 } 2022 return result; 2023 } 2024 2025 // Use static initialization to get the default before parsing 2026 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2027 2028 void Arguments::set_heap_size() { 2029 const julong phys_mem = 2030 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2031 : (julong)MaxRAM; 2032 2033 // If the maximum heap size has not been set with -Xmx, 2034 // then set it as fraction of the size of physical memory, 2035 // respecting the maximum and minimum sizes of the heap. 2036 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2037 julong reasonable_max = phys_mem / MaxRAMFraction; 2038 2039 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2040 // Small physical memory, so use a minimum fraction of it for the heap 2041 reasonable_max = phys_mem / MinRAMFraction; 2042 } else { 2043 // Not-small physical memory, so require a heap at least 2044 // as large as MaxHeapSize 2045 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2046 } 2047 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2048 // Limit the heap size to ErgoHeapSizeLimit 2049 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2050 } 2051 if (UseCompressedOops) { 2052 // Limit the heap size to the maximum possible when using compressed oops 2053 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2054 2055 // HeapBaseMinAddress can be greater than default but not less than. 2056 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2057 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2058 // matches compressed oops printing flags 2059 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 2060 jio_fprintf(defaultStream::error_stream(), 2061 "HeapBaseMinAddress must be at least " SIZE_FORMAT 2062 " (" SIZE_FORMAT "G) which is greater than value given " 2063 SIZE_FORMAT "\n", 2064 DefaultHeapBaseMinAddress, 2065 DefaultHeapBaseMinAddress/G, 2066 HeapBaseMinAddress); 2067 } 2068 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2069 } 2070 } 2071 2072 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2073 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2074 // but it should be not less than default MaxHeapSize. 2075 max_coop_heap -= HeapBaseMinAddress; 2076 } 2077 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2078 } 2079 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2080 2081 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2082 // An initial heap size was specified on the command line, 2083 // so be sure that the maximum size is consistent. Done 2084 // after call to limit_by_allocatable_memory because that 2085 // method might reduce the allocation size. 2086 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2087 } 2088 2089 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2090 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2091 } 2092 2093 // If the minimum or initial heap_size have not been set or requested to be set 2094 // ergonomically, set them accordingly. 2095 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2096 julong reasonable_minimum = (julong)(OldSize + NewSize); 2097 2098 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2099 2100 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2101 2102 if (InitialHeapSize == 0) { 2103 julong reasonable_initial = phys_mem / InitialRAMFraction; 2104 2105 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2106 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2107 2108 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2109 2110 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2111 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2112 } 2113 // If the minimum heap size has not been set (via -Xms), 2114 // synchronize with InitialHeapSize to avoid errors with the default value. 2115 if (min_heap_size() == 0) { 2116 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2117 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2118 } 2119 } 2120 } 2121 2122 // This option inspects the machine and attempts to set various 2123 // parameters to be optimal for long-running, memory allocation 2124 // intensive jobs. It is intended for machines with large 2125 // amounts of cpu and memory. 2126 jint Arguments::set_aggressive_heap_flags() { 2127 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2128 // VM, but we may not be able to represent the total physical memory 2129 // available (like having 8gb of memory on a box but using a 32bit VM). 2130 // Thus, we need to make sure we're using a julong for intermediate 2131 // calculations. 2132 julong initHeapSize; 2133 julong total_memory = os::physical_memory(); 2134 2135 if (total_memory < (julong) 256 * M) { 2136 jio_fprintf(defaultStream::error_stream(), 2137 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2138 vm_exit(1); 2139 } 2140 2141 // The heap size is half of available memory, or (at most) 2142 // all of possible memory less 160mb (leaving room for the OS 2143 // when using ISM). This is the maximum; because adaptive sizing 2144 // is turned on below, the actual space used may be smaller. 2145 2146 initHeapSize = MIN2(total_memory / (julong) 2, 2147 total_memory - (julong) 160 * M); 2148 2149 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2150 2151 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2152 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2153 return JNI_EINVAL; 2154 } 2155 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2156 return JNI_EINVAL; 2157 } 2158 // Currently the minimum size and the initial heap sizes are the same. 2159 set_min_heap_size(initHeapSize); 2160 } 2161 if (FLAG_IS_DEFAULT(NewSize)) { 2162 // Make the young generation 3/8ths of the total heap. 2163 if (FLAG_SET_CMDLINE(size_t, NewSize, 2164 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2165 return JNI_EINVAL; 2166 } 2167 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2168 return JNI_EINVAL; 2169 } 2170 } 2171 2172 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2173 FLAG_SET_DEFAULT(UseLargePages, true); 2174 #endif 2175 2176 // Increase some data structure sizes for efficiency 2177 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2178 return JNI_EINVAL; 2179 } 2180 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2181 return JNI_EINVAL; 2182 } 2183 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2184 return JNI_EINVAL; 2185 } 2186 2187 // See the OldPLABSize comment below, but replace 'after promotion' 2188 // with 'after copying'. YoungPLABSize is the size of the survivor 2189 // space per-gc-thread buffers. The default is 4kw. 2190 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2191 return JNI_EINVAL; 2192 } 2193 2194 // OldPLABSize is the size of the buffers in the old gen that 2195 // UseParallelGC uses to promote live data that doesn't fit in the 2196 // survivor spaces. At any given time, there's one for each gc thread. 2197 // The default size is 1kw. These buffers are rarely used, since the 2198 // survivor spaces are usually big enough. For specjbb, however, there 2199 // are occasions when there's lots of live data in the young gen 2200 // and we end up promoting some of it. We don't have a definite 2201 // explanation for why bumping OldPLABSize helps, but the theory 2202 // is that a bigger PLAB results in retaining something like the 2203 // original allocation order after promotion, which improves mutator 2204 // locality. A minor effect may be that larger PLABs reduce the 2205 // number of PLAB allocation events during gc. The value of 8kw 2206 // was arrived at by experimenting with specjbb. 2207 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2208 return JNI_EINVAL; 2209 } 2210 2211 // Enable parallel GC and adaptive generation sizing 2212 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2213 return JNI_EINVAL; 2214 } 2215 FLAG_SET_DEFAULT(ParallelGCThreads, 2216 Abstract_VM_Version::parallel_worker_threads()); 2217 2218 // Encourage steady state memory management 2219 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2220 return JNI_EINVAL; 2221 } 2222 2223 // This appears to improve mutator locality 2224 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2225 return JNI_EINVAL; 2226 } 2227 2228 // Get around early Solaris scheduling bug 2229 // (affinity vs other jobs on system) 2230 // but disallow DR and offlining (5008695). 2231 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2232 return JNI_EINVAL; 2233 } 2234 2235 return JNI_OK; 2236 } 2237 2238 // This must be called after ergonomics. 2239 void Arguments::set_bytecode_flags() { 2240 if (!RewriteBytecodes) { 2241 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2242 } 2243 } 2244 2245 // Aggressive optimization flags -XX:+AggressiveOpts 2246 jint Arguments::set_aggressive_opts_flags() { 2247 #ifdef COMPILER2 2248 if (AggressiveUnboxing) { 2249 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2250 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2251 } else if (!EliminateAutoBox) { 2252 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2253 AggressiveUnboxing = false; 2254 } 2255 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2256 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2257 } else if (!DoEscapeAnalysis) { 2258 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2259 AggressiveUnboxing = false; 2260 } 2261 } 2262 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2263 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2264 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2265 } 2266 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2267 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2268 } 2269 2270 // Feed the cache size setting into the JDK 2271 char buffer[1024]; 2272 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2273 if (!add_property(buffer)) { 2274 return JNI_ENOMEM; 2275 } 2276 } 2277 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2278 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2279 } 2280 #endif 2281 2282 if (AggressiveOpts) { 2283 // Sample flag setting code 2284 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2285 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2286 // } 2287 } 2288 2289 return JNI_OK; 2290 } 2291 2292 //=========================================================================================================== 2293 // Parsing of java.compiler property 2294 2295 void Arguments::process_java_compiler_argument(const char* arg) { 2296 // For backwards compatibility, Djava.compiler=NONE or "" 2297 // causes us to switch to -Xint mode UNLESS -Xdebug 2298 // is also specified. 2299 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2300 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2301 } 2302 } 2303 2304 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2305 _sun_java_launcher = os::strdup_check_oom(launcher); 2306 } 2307 2308 bool Arguments::created_by_java_launcher() { 2309 assert(_sun_java_launcher != NULL, "property must have value"); 2310 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2311 } 2312 2313 bool Arguments::sun_java_launcher_is_altjvm() { 2314 return _sun_java_launcher_is_altjvm; 2315 } 2316 2317 //=========================================================================================================== 2318 // Parsing of main arguments 2319 2320 #if INCLUDE_JVMCI 2321 // Check consistency of jvmci vm argument settings. 2322 bool Arguments::check_jvmci_args_consistency() { 2323 if (!EnableJVMCI && !JVMCIGlobals::check_jvmci_flags_are_consistent()) { 2324 JVMCIGlobals::print_jvmci_args_inconsistency_error_message(); 2325 return false; 2326 } 2327 return true; 2328 } 2329 #endif //INCLUDE_JVMCI 2330 2331 // Check consistency of GC selection 2332 bool Arguments::check_gc_consistency() { 2333 // Ensure that the user has not selected conflicting sets 2334 // of collectors. 2335 uint i = 0; 2336 if (UseSerialGC) i++; 2337 if (UseConcMarkSweepGC) i++; 2338 if (UseParallelGC || UseParallelOldGC) i++; 2339 if (UseG1GC) i++; 2340 if (i > 1) { 2341 jio_fprintf(defaultStream::error_stream(), 2342 "Conflicting collector combinations in option list; " 2343 "please refer to the release notes for the combinations " 2344 "allowed\n"); 2345 return false; 2346 } 2347 2348 if (UseConcMarkSweepGC && !UseParNewGC) { 2349 jio_fprintf(defaultStream::error_stream(), 2350 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2351 return false; 2352 } 2353 2354 if (UseParNewGC && !UseConcMarkSweepGC) { 2355 jio_fprintf(defaultStream::error_stream(), 2356 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2357 return false; 2358 } 2359 2360 return true; 2361 } 2362 2363 // Check the consistency of vm_init_args 2364 bool Arguments::check_vm_args_consistency() { 2365 // Method for adding checks for flag consistency. 2366 // The intent is to warn the user of all possible conflicts, 2367 // before returning an error. 2368 // Note: Needs platform-dependent factoring. 2369 bool status = true; 2370 2371 if (TLABRefillWasteFraction == 0) { 2372 jio_fprintf(defaultStream::error_stream(), 2373 "TLABRefillWasteFraction should be a denominator, " 2374 "not " SIZE_FORMAT "\n", 2375 TLABRefillWasteFraction); 2376 status = false; 2377 } 2378 2379 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2380 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2381 } 2382 2383 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2384 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2385 } 2386 2387 if (GCTimeLimit == 100) { 2388 // Turn off gc-overhead-limit-exceeded checks 2389 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2390 } 2391 2392 status = status && check_gc_consistency(); 2393 2394 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2395 // insists that we hold the requisite locks so that the iteration is 2396 // MT-safe. For the verification at start-up and shut-down, we don't 2397 // yet have a good way of acquiring and releasing these locks, 2398 // which are not visible at the CollectedHeap level. We want to 2399 // be able to acquire these locks and then do the iteration rather 2400 // than just disable the lock verification. This will be fixed under 2401 // bug 4788986. 2402 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2403 if (VerifyDuringStartup) { 2404 warning("Heap verification at start-up disabled " 2405 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2406 VerifyDuringStartup = false; // Disable verification at start-up 2407 } 2408 2409 if (VerifyBeforeExit) { 2410 warning("Heap verification at shutdown disabled " 2411 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2412 VerifyBeforeExit = false; // Disable verification at shutdown 2413 } 2414 } 2415 2416 if (PrintNMTStatistics) { 2417 #if INCLUDE_NMT 2418 if (MemTracker::tracking_level() == NMT_off) { 2419 #endif // INCLUDE_NMT 2420 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2421 PrintNMTStatistics = false; 2422 #if INCLUDE_NMT 2423 } 2424 #endif 2425 } 2426 #if INCLUDE_JVMCI 2427 2428 status = status && check_jvmci_args_consistency(); 2429 2430 if (EnableJVMCI) { 2431 if (!ScavengeRootsInCode) { 2432 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2433 ScavengeRootsInCode = 1; 2434 } 2435 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2436 TypeProfileLevel = 0; 2437 } 2438 if (UseJVMCICompiler) { 2439 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2440 TypeProfileWidth = 8; 2441 } 2442 } 2443 } 2444 #endif 2445 2446 // Check lower bounds of the code cache 2447 // Template Interpreter code is approximately 3X larger in debug builds. 2448 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2449 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2450 jio_fprintf(defaultStream::error_stream(), 2451 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2452 os::vm_page_size()/K); 2453 status = false; 2454 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2455 jio_fprintf(defaultStream::error_stream(), 2456 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2457 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2458 status = false; 2459 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2460 jio_fprintf(defaultStream::error_stream(), 2461 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2462 min_code_cache_size/K); 2463 status = false; 2464 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2465 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2466 jio_fprintf(defaultStream::error_stream(), 2467 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2468 CODE_CACHE_SIZE_LIMIT/M); 2469 status = false; 2470 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2471 jio_fprintf(defaultStream::error_stream(), 2472 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2473 min_code_cache_size/K); 2474 status = false; 2475 } 2476 2477 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2478 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2479 } 2480 2481 #ifndef SUPPORT_RESERVED_STACK_AREA 2482 if (StackReservedPages != 0) { 2483 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2484 warning("Reserved Stack Area not supported on this platform"); 2485 } 2486 #endif 2487 2488 if (LINUX_ONLY(LP64_ONLY(false &&)) !FLAG_IS_DEFAULT(ValueTypePassFieldsAsArgs)) { 2489 FLAG_SET_CMDLINE(bool, ValueTypePassFieldsAsArgs, false); 2490 warning("ValueTypePassFieldsAsArgs is not supported on this platform"); 2491 } 2492 return status; 2493 } 2494 2495 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2496 const char* option_type) { 2497 if (ignore) return false; 2498 2499 const char* spacer = " "; 2500 if (option_type == NULL) { 2501 option_type = ++spacer; // Set both to the empty string. 2502 } 2503 2504 if (os::obsolete_option(option)) { 2505 jio_fprintf(defaultStream::error_stream(), 2506 "Obsolete %s%soption: %s\n", option_type, spacer, 2507 option->optionString); 2508 return false; 2509 } else { 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Unrecognized %s%soption: %s\n", option_type, spacer, 2512 option->optionString); 2513 return true; 2514 } 2515 } 2516 2517 static const char* user_assertion_options[] = { 2518 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2519 }; 2520 2521 static const char* system_assertion_options[] = { 2522 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2523 }; 2524 2525 bool Arguments::parse_uintx(const char* value, 2526 uintx* uintx_arg, 2527 uintx min_size) { 2528 2529 // Check the sign first since atomull() parses only unsigned values. 2530 bool value_is_positive = !(*value == '-'); 2531 2532 if (value_is_positive) { 2533 julong n; 2534 bool good_return = atomull(value, &n); 2535 if (good_return) { 2536 bool above_minimum = n >= min_size; 2537 bool value_is_too_large = n > max_uintx; 2538 2539 if (above_minimum && !value_is_too_large) { 2540 *uintx_arg = n; 2541 return true; 2542 } 2543 } 2544 } 2545 return false; 2546 } 2547 2548 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2549 julong* long_arg, 2550 julong min_size) { 2551 if (!atomull(s, long_arg)) return arg_unreadable; 2552 return check_memory_size(*long_arg, min_size); 2553 } 2554 2555 // Parse JavaVMInitArgs structure 2556 2557 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2558 const JavaVMInitArgs *java_options_args, 2559 const JavaVMInitArgs *cmd_line_args) { 2560 // For components of the system classpath. 2561 SysClassPath scp(Arguments::get_sysclasspath()); 2562 bool scp_assembly_required = false; 2563 2564 // Save default settings for some mode flags 2565 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2566 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2567 Arguments::_ClipInlining = ClipInlining; 2568 Arguments::_BackgroundCompilation = BackgroundCompilation; 2569 if (TieredCompilation) { 2570 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2571 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2572 } 2573 2574 // Setup flags for mixed which is the default 2575 set_mode_flags(_mixed); 2576 2577 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2578 // variable (if present). 2579 jint result = parse_each_vm_init_arg( 2580 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2581 if (result != JNI_OK) { 2582 return result; 2583 } 2584 2585 // Parse args structure generated from the command line flags. 2586 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required, 2587 Flag::COMMAND_LINE); 2588 if (result != JNI_OK) { 2589 return result; 2590 } 2591 2592 // Parse args structure generated from the _JAVA_OPTIONS environment 2593 // variable (if present) (mimics classic VM) 2594 result = parse_each_vm_init_arg( 2595 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2596 if (result != JNI_OK) { 2597 return result; 2598 } 2599 2600 // Do final processing now that all arguments have been parsed 2601 result = finalize_vm_init_args(&scp, scp_assembly_required); 2602 if (result != JNI_OK) { 2603 return result; 2604 } 2605 2606 return JNI_OK; 2607 } 2608 2609 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2610 // represents a valid JDWP agent. is_path==true denotes that we 2611 // are dealing with -agentpath (case where name is a path), otherwise with 2612 // -agentlib 2613 bool valid_jdwp_agent(char *name, bool is_path) { 2614 char *_name; 2615 const char *_jdwp = "jdwp"; 2616 size_t _len_jdwp, _len_prefix; 2617 2618 if (is_path) { 2619 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2620 return false; 2621 } 2622 2623 _name++; // skip past last path separator 2624 _len_prefix = strlen(JNI_LIB_PREFIX); 2625 2626 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2627 return false; 2628 } 2629 2630 _name += _len_prefix; 2631 _len_jdwp = strlen(_jdwp); 2632 2633 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2634 _name += _len_jdwp; 2635 } 2636 else { 2637 return false; 2638 } 2639 2640 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2641 return false; 2642 } 2643 2644 return true; 2645 } 2646 2647 if (strcmp(name, _jdwp) == 0) { 2648 return true; 2649 } 2650 2651 return false; 2652 } 2653 2654 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2655 SysClassPath* scp_p, 2656 bool* scp_assembly_required_p, 2657 Flag::Flags origin) { 2658 // For match_option to return remaining or value part of option string 2659 const char* tail; 2660 2661 // iterate over arguments 2662 for (int index = 0; index < args->nOptions; index++) { 2663 bool is_absolute_path = false; // for -agentpath vs -agentlib 2664 2665 const JavaVMOption* option = args->options + index; 2666 2667 if (!match_option(option, "-Djava.class.path", &tail) && 2668 !match_option(option, "-Dsun.java.command", &tail) && 2669 !match_option(option, "-Dsun.java.launcher", &tail)) { 2670 2671 // add all jvm options to the jvm_args string. This string 2672 // is used later to set the java.vm.args PerfData string constant. 2673 // the -Djava.class.path and the -Dsun.java.command options are 2674 // omitted from jvm_args string as each have their own PerfData 2675 // string constant object. 2676 build_jvm_args(option->optionString); 2677 } 2678 2679 // -verbose:[class/gc/jni] 2680 if (match_option(option, "-verbose", &tail)) { 2681 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2682 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload)); 2683 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload)); 2684 } else if (!strcmp(tail, ":gc")) { 2685 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2686 } else if (!strcmp(tail, ":jni")) { 2687 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2688 return JNI_EINVAL; 2689 } 2690 } 2691 // -da / -ea / -disableassertions / -enableassertions 2692 // These accept an optional class/package name separated by a colon, e.g., 2693 // -da:java.lang.Thread. 2694 } else if (match_option(option, user_assertion_options, &tail, true)) { 2695 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2696 if (*tail == '\0') { 2697 JavaAssertions::setUserClassDefault(enable); 2698 } else { 2699 assert(*tail == ':', "bogus match by match_option()"); 2700 JavaAssertions::addOption(tail + 1, enable); 2701 } 2702 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2703 } else if (match_option(option, system_assertion_options, &tail, false)) { 2704 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2705 JavaAssertions::setSystemClassDefault(enable); 2706 // -bootclasspath: 2707 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2708 scp_p->reset_path(tail); 2709 *scp_assembly_required_p = true; 2710 // -bootclasspath/a: 2711 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2712 scp_p->add_suffix(tail); 2713 *scp_assembly_required_p = true; 2714 // -bootclasspath/p: 2715 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2716 scp_p->add_prefix(tail); 2717 *scp_assembly_required_p = true; 2718 // -Xrun 2719 } else if (match_option(option, "-Xrun", &tail)) { 2720 if (tail != NULL) { 2721 const char* pos = strchr(tail, ':'); 2722 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2723 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2724 name[len] = '\0'; 2725 2726 char *options = NULL; 2727 if(pos != NULL) { 2728 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2729 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2730 } 2731 #if !INCLUDE_JVMTI 2732 if (strcmp(name, "jdwp") == 0) { 2733 jio_fprintf(defaultStream::error_stream(), 2734 "Debugging agents are not supported in this VM\n"); 2735 return JNI_ERR; 2736 } 2737 #endif // !INCLUDE_JVMTI 2738 add_init_library(name, options); 2739 } 2740 // -agentlib and -agentpath 2741 } else if (match_option(option, "-agentlib:", &tail) || 2742 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2743 if(tail != NULL) { 2744 const char* pos = strchr(tail, '='); 2745 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2746 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2747 name[len] = '\0'; 2748 2749 char *options = NULL; 2750 if(pos != NULL) { 2751 options = os::strdup_check_oom(pos + 1, mtInternal); 2752 } 2753 #if !INCLUDE_JVMTI 2754 if (valid_jdwp_agent(name, is_absolute_path)) { 2755 jio_fprintf(defaultStream::error_stream(), 2756 "Debugging agents are not supported in this VM\n"); 2757 return JNI_ERR; 2758 } 2759 #endif // !INCLUDE_JVMTI 2760 add_init_agent(name, options, is_absolute_path); 2761 } 2762 // -javaagent 2763 } else if (match_option(option, "-javaagent:", &tail)) { 2764 #if !INCLUDE_JVMTI 2765 jio_fprintf(defaultStream::error_stream(), 2766 "Instrumentation agents are not supported in this VM\n"); 2767 return JNI_ERR; 2768 #else 2769 if(tail != NULL) { 2770 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2771 add_init_agent("instrument", options, false); 2772 } 2773 #endif // !INCLUDE_JVMTI 2774 // -Xnoclassgc 2775 } else if (match_option(option, "-Xnoclassgc")) { 2776 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2777 return JNI_EINVAL; 2778 } 2779 // -Xconcgc 2780 } else if (match_option(option, "-Xconcgc")) { 2781 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2782 return JNI_EINVAL; 2783 } 2784 // -Xnoconcgc 2785 } else if (match_option(option, "-Xnoconcgc")) { 2786 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2787 return JNI_EINVAL; 2788 } 2789 // -Xbatch 2790 } else if (match_option(option, "-Xbatch")) { 2791 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2792 return JNI_EINVAL; 2793 } 2794 // -Xmn for compatibility with other JVM vendors 2795 } else if (match_option(option, "-Xmn", &tail)) { 2796 julong long_initial_young_size = 0; 2797 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2798 if (errcode != arg_in_range) { 2799 jio_fprintf(defaultStream::error_stream(), 2800 "Invalid initial young generation size: %s\n", option->optionString); 2801 describe_range_error(errcode); 2802 return JNI_EINVAL; 2803 } 2804 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2805 return JNI_EINVAL; 2806 } 2807 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2808 return JNI_EINVAL; 2809 } 2810 // -Xms 2811 } else if (match_option(option, "-Xms", &tail)) { 2812 julong long_initial_heap_size = 0; 2813 // an initial heap size of 0 means automatically determine 2814 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2815 if (errcode != arg_in_range) { 2816 jio_fprintf(defaultStream::error_stream(), 2817 "Invalid initial heap size: %s\n", option->optionString); 2818 describe_range_error(errcode); 2819 return JNI_EINVAL; 2820 } 2821 set_min_heap_size((size_t)long_initial_heap_size); 2822 // Currently the minimum size and the initial heap sizes are the same. 2823 // Can be overridden with -XX:InitialHeapSize. 2824 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2825 return JNI_EINVAL; 2826 } 2827 // -Xmx 2828 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2829 julong long_max_heap_size = 0; 2830 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2831 if (errcode != arg_in_range) { 2832 jio_fprintf(defaultStream::error_stream(), 2833 "Invalid maximum heap size: %s\n", option->optionString); 2834 describe_range_error(errcode); 2835 return JNI_EINVAL; 2836 } 2837 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2838 return JNI_EINVAL; 2839 } 2840 // Xmaxf 2841 } else if (match_option(option, "-Xmaxf", &tail)) { 2842 char* err; 2843 int maxf = (int)(strtod(tail, &err) * 100); 2844 if (*err != '\0' || *tail == '\0') { 2845 jio_fprintf(defaultStream::error_stream(), 2846 "Bad max heap free percentage size: %s\n", 2847 option->optionString); 2848 return JNI_EINVAL; 2849 } else { 2850 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2851 return JNI_EINVAL; 2852 } 2853 } 2854 // Xminf 2855 } else if (match_option(option, "-Xminf", &tail)) { 2856 char* err; 2857 int minf = (int)(strtod(tail, &err) * 100); 2858 if (*err != '\0' || *tail == '\0') { 2859 jio_fprintf(defaultStream::error_stream(), 2860 "Bad min heap free percentage size: %s\n", 2861 option->optionString); 2862 return JNI_EINVAL; 2863 } else { 2864 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2865 return JNI_EINVAL; 2866 } 2867 } 2868 // -Xss 2869 } else if (match_option(option, "-Xss", &tail)) { 2870 julong long_ThreadStackSize = 0; 2871 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2872 if (errcode != arg_in_range) { 2873 jio_fprintf(defaultStream::error_stream(), 2874 "Invalid thread stack size: %s\n", option->optionString); 2875 describe_range_error(errcode); 2876 return JNI_EINVAL; 2877 } 2878 // Internally track ThreadStackSize in units of 1024 bytes. 2879 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2880 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2881 return JNI_EINVAL; 2882 } 2883 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 2884 } else if (match_option(option, "-Xoss", &tail) || 2885 match_option(option, "-Xsqnopause") || 2886 match_option(option, "-Xoptimize") || 2887 match_option(option, "-Xboundthreads") || 2888 match_option(option, "-Xusealtsigs")) { 2889 // All these options are deprecated in JDK 9 and will be removed in a future release 2890 char version[256]; 2891 JDK_Version::jdk(9).to_string(version, sizeof(version)); 2892 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2893 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2894 julong long_CodeCacheExpansionSize = 0; 2895 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2896 if (errcode != arg_in_range) { 2897 jio_fprintf(defaultStream::error_stream(), 2898 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2899 os::vm_page_size()/K); 2900 return JNI_EINVAL; 2901 } 2902 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 2903 return JNI_EINVAL; 2904 } 2905 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2906 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2907 julong long_ReservedCodeCacheSize = 0; 2908 2909 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2910 if (errcode != arg_in_range) { 2911 jio_fprintf(defaultStream::error_stream(), 2912 "Invalid maximum code cache size: %s.\n", option->optionString); 2913 return JNI_EINVAL; 2914 } 2915 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 2916 return JNI_EINVAL; 2917 } 2918 // -XX:NonNMethodCodeHeapSize= 2919 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2920 julong long_NonNMethodCodeHeapSize = 0; 2921 2922 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2923 if (errcode != arg_in_range) { 2924 jio_fprintf(defaultStream::error_stream(), 2925 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2926 return JNI_EINVAL; 2927 } 2928 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 2929 return JNI_EINVAL; 2930 } 2931 // -XX:ProfiledCodeHeapSize= 2932 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2933 julong long_ProfiledCodeHeapSize = 0; 2934 2935 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2936 if (errcode != arg_in_range) { 2937 jio_fprintf(defaultStream::error_stream(), 2938 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2939 return JNI_EINVAL; 2940 } 2941 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 2942 return JNI_EINVAL; 2943 } 2944 // -XX:NonProfiledCodeHeapSizee= 2945 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2946 julong long_NonProfiledCodeHeapSize = 0; 2947 2948 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2949 if (errcode != arg_in_range) { 2950 jio_fprintf(defaultStream::error_stream(), 2951 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2952 return JNI_EINVAL; 2953 } 2954 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 2955 return JNI_EINVAL; 2956 } 2957 // -green 2958 } else if (match_option(option, "-green")) { 2959 jio_fprintf(defaultStream::error_stream(), 2960 "Green threads support not available\n"); 2961 return JNI_EINVAL; 2962 // -native 2963 } else if (match_option(option, "-native")) { 2964 // HotSpot always uses native threads, ignore silently for compatibility 2965 // -Xrs 2966 } else if (match_option(option, "-Xrs")) { 2967 // Classic/EVM option, new functionality 2968 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 2969 return JNI_EINVAL; 2970 } 2971 // -Xprof 2972 } else if (match_option(option, "-Xprof")) { 2973 #if INCLUDE_FPROF 2974 _has_profile = true; 2975 #else // INCLUDE_FPROF 2976 jio_fprintf(defaultStream::error_stream(), 2977 "Flat profiling is not supported in this VM.\n"); 2978 return JNI_ERR; 2979 #endif // INCLUDE_FPROF 2980 // -Xconcurrentio 2981 } else if (match_option(option, "-Xconcurrentio")) { 2982 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 2983 return JNI_EINVAL; 2984 } 2985 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2986 return JNI_EINVAL; 2987 } 2988 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 2989 return JNI_EINVAL; 2990 } 2991 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 2995 return JNI_EINVAL; 2996 } 2997 2998 // -Xinternalversion 2999 } else if (match_option(option, "-Xinternalversion")) { 3000 jio_fprintf(defaultStream::output_stream(), "%s\n", 3001 VM_Version::internal_vm_info_string()); 3002 vm_exit(0); 3003 #ifndef PRODUCT 3004 // -Xprintflags 3005 } else if (match_option(option, "-Xprintflags")) { 3006 CommandLineFlags::printFlags(tty, false); 3007 vm_exit(0); 3008 #endif 3009 // -D 3010 } else if (match_option(option, "-D", &tail)) { 3011 const char* value; 3012 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3013 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3014 // abort if -Djava.endorsed.dirs is set 3015 jio_fprintf(defaultStream::output_stream(), 3016 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3017 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3018 return JNI_EINVAL; 3019 } 3020 if (match_option(option, "-Djava.ext.dirs=", &value) && 3021 *value != '\0' && strcmp(value, "\"\"") != 0) { 3022 // abort if -Djava.ext.dirs is set 3023 jio_fprintf(defaultStream::output_stream(), 3024 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3025 return JNI_EINVAL; 3026 } 3027 3028 if (!add_property(tail)) { 3029 return JNI_ENOMEM; 3030 } 3031 // Out of the box management support 3032 if (match_option(option, "-Dcom.sun.management", &tail)) { 3033 #if INCLUDE_MANAGEMENT 3034 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3035 return JNI_EINVAL; 3036 } 3037 #else 3038 jio_fprintf(defaultStream::output_stream(), 3039 "-Dcom.sun.management is not supported in this VM.\n"); 3040 return JNI_ERR; 3041 #endif 3042 } 3043 // -Xint 3044 } else if (match_option(option, "-Xint")) { 3045 set_mode_flags(_int); 3046 // -Xmixed 3047 } else if (match_option(option, "-Xmixed")) { 3048 set_mode_flags(_mixed); 3049 // -Xcomp 3050 } else if (match_option(option, "-Xcomp")) { 3051 // for testing the compiler; turn off all flags that inhibit compilation 3052 set_mode_flags(_comp); 3053 // -Xshare:dump 3054 } else if (match_option(option, "-Xshare:dump")) { 3055 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3056 return JNI_EINVAL; 3057 } 3058 set_mode_flags(_int); // Prevent compilation, which creates objects 3059 // -Xshare:on 3060 } else if (match_option(option, "-Xshare:on")) { 3061 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3062 return JNI_EINVAL; 3063 } 3064 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3065 return JNI_EINVAL; 3066 } 3067 // -Xshare:auto 3068 } else if (match_option(option, "-Xshare:auto")) { 3069 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3070 return JNI_EINVAL; 3071 } 3072 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3073 return JNI_EINVAL; 3074 } 3075 // -Xshare:off 3076 } else if (match_option(option, "-Xshare:off")) { 3077 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3078 return JNI_EINVAL; 3079 } 3080 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3081 return JNI_EINVAL; 3082 } 3083 // -Xverify 3084 } else if (match_option(option, "-Xverify", &tail)) { 3085 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3086 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3087 return JNI_EINVAL; 3088 } 3089 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3090 return JNI_EINVAL; 3091 } 3092 } else if (strcmp(tail, ":remote") == 0) { 3093 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3094 return JNI_EINVAL; 3095 } 3096 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3097 return JNI_EINVAL; 3098 } 3099 } else if (strcmp(tail, ":none") == 0) { 3100 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3101 return JNI_EINVAL; 3102 } 3103 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3104 return JNI_EINVAL; 3105 } 3106 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3107 return JNI_EINVAL; 3108 } 3109 // -Xdebug 3110 } else if (match_option(option, "-Xdebug")) { 3111 // note this flag has been used, then ignore 3112 set_xdebug_mode(true); 3113 // -Xnoagent 3114 } else if (match_option(option, "-Xnoagent")) { 3115 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3116 } else if (match_option(option, "-Xloggc:", &tail)) { 3117 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3118 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3119 _gc_log_filename = os::strdup_check_oom(tail); 3120 } else if (match_option(option, "-Xlog", &tail)) { 3121 bool ret = false; 3122 if (strcmp(tail, ":help") == 0) { 3123 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3124 vm_exit(0); 3125 } else if (strcmp(tail, ":disable") == 0) { 3126 LogConfiguration::disable_logging(); 3127 ret = true; 3128 } else if (*tail == '\0') { 3129 ret = LogConfiguration::parse_command_line_arguments(); 3130 assert(ret, "-Xlog without arguments should never fail to parse"); 3131 } else if (*tail == ':') { 3132 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3133 } 3134 if (ret == false) { 3135 jio_fprintf(defaultStream::error_stream(), 3136 "Invalid -Xlog option '-Xlog%s'\n", 3137 tail); 3138 return JNI_EINVAL; 3139 } 3140 // JNI hooks 3141 } else if (match_option(option, "-Xcheck", &tail)) { 3142 if (!strcmp(tail, ":jni")) { 3143 #if !INCLUDE_JNI_CHECK 3144 warning("JNI CHECKING is not supported in this VM"); 3145 #else 3146 CheckJNICalls = true; 3147 #endif // INCLUDE_JNI_CHECK 3148 } else if (is_bad_option(option, args->ignoreUnrecognized, 3149 "check")) { 3150 return JNI_EINVAL; 3151 } 3152 } else if (match_option(option, "vfprintf")) { 3153 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3154 } else if (match_option(option, "exit")) { 3155 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3156 } else if (match_option(option, "abort")) { 3157 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3158 // -XX:+AggressiveHeap 3159 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3160 jint result = set_aggressive_heap_flags(); 3161 if (result != JNI_OK) { 3162 return result; 3163 } 3164 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3165 // and the last option wins. 3166 } else if (match_option(option, "-XX:+NeverTenure")) { 3167 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3168 return JNI_EINVAL; 3169 } 3170 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3171 return JNI_EINVAL; 3172 } 3173 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3174 return JNI_EINVAL; 3175 } 3176 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3177 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3178 return JNI_EINVAL; 3179 } 3180 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3181 return JNI_EINVAL; 3182 } 3183 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3184 return JNI_EINVAL; 3185 } 3186 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3187 uintx max_tenuring_thresh = 0; 3188 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3189 jio_fprintf(defaultStream::error_stream(), 3190 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3191 return JNI_EINVAL; 3192 } 3193 3194 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3195 return JNI_EINVAL; 3196 } 3197 3198 if (MaxTenuringThreshold == 0) { 3199 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3200 return JNI_EINVAL; 3201 } 3202 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3203 return JNI_EINVAL; 3204 } 3205 } else { 3206 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3207 return JNI_EINVAL; 3208 } 3209 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3210 return JNI_EINVAL; 3211 } 3212 } 3213 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3214 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3215 return JNI_EINVAL; 3216 } 3217 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3218 return JNI_EINVAL; 3219 } 3220 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3221 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3222 return JNI_EINVAL; 3223 } 3224 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3225 return JNI_EINVAL; 3226 } 3227 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3228 #if defined(DTRACE_ENABLED) 3229 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3230 return JNI_EINVAL; 3231 } 3232 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3233 return JNI_EINVAL; 3234 } 3235 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3236 return JNI_EINVAL; 3237 } 3238 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3239 return JNI_EINVAL; 3240 } 3241 #else // defined(DTRACE_ENABLED) 3242 jio_fprintf(defaultStream::error_stream(), 3243 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3244 return JNI_EINVAL; 3245 #endif // defined(DTRACE_ENABLED) 3246 #ifdef ASSERT 3247 } else if (match_option(option, "-XX:+FullGCALot")) { 3248 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3249 return JNI_EINVAL; 3250 } 3251 // disable scavenge before parallel mark-compact 3252 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3253 return JNI_EINVAL; 3254 } 3255 #endif 3256 #if !INCLUDE_MANAGEMENT 3257 } else if (match_option(option, "-XX:+ManagementServer")) { 3258 jio_fprintf(defaultStream::error_stream(), 3259 "ManagementServer is not supported in this VM.\n"); 3260 return JNI_ERR; 3261 #endif // INCLUDE_MANAGEMENT 3262 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3263 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3264 // already been handled 3265 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3266 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3267 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3268 return JNI_EINVAL; 3269 } 3270 } 3271 // Unknown option 3272 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3273 return JNI_ERR; 3274 } 3275 } 3276 3277 // PrintSharedArchiveAndExit will turn on 3278 // -Xshare:on 3279 // -Xlog:classpath=info 3280 if (PrintSharedArchiveAndExit) { 3281 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3282 return JNI_EINVAL; 3283 } 3284 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3285 return JNI_EINVAL; 3286 } 3287 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classpath)); 3288 } 3289 3290 // Change the default value for flags which have different default values 3291 // when working with older JDKs. 3292 #ifdef LINUX 3293 if (JDK_Version::current().compare_major(6) <= 0 && 3294 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3295 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3296 } 3297 #endif // LINUX 3298 fix_appclasspath(); 3299 return JNI_OK; 3300 } 3301 3302 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3303 // 3304 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3305 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3306 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3307 // path is treated as the current directory. 3308 // 3309 // This causes problems with CDS, which requires that all directories specified in the classpath 3310 // must be empty. In most cases, applications do NOT want to load classes from the current 3311 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3312 // scripts compatible with CDS. 3313 void Arguments::fix_appclasspath() { 3314 if (IgnoreEmptyClassPaths) { 3315 const char separator = *os::path_separator(); 3316 const char* src = _java_class_path->value(); 3317 3318 // skip over all the leading empty paths 3319 while (*src == separator) { 3320 src ++; 3321 } 3322 3323 char* copy = os::strdup_check_oom(src, mtInternal); 3324 3325 // trim all trailing empty paths 3326 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3327 *tail = '\0'; 3328 } 3329 3330 char from[3] = {separator, separator, '\0'}; 3331 char to [2] = {separator, '\0'}; 3332 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3333 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3334 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3335 } 3336 3337 _java_class_path->set_value(copy); 3338 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3339 } 3340 } 3341 3342 static bool has_jar_files(const char* directory) { 3343 DIR* dir = os::opendir(directory); 3344 if (dir == NULL) return false; 3345 3346 struct dirent *entry; 3347 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3348 bool hasJarFile = false; 3349 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3350 const char* name = entry->d_name; 3351 const char* ext = name + strlen(name) - 4; 3352 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3353 } 3354 FREE_C_HEAP_ARRAY(char, dbuf); 3355 os::closedir(dir); 3356 return hasJarFile ; 3357 } 3358 3359 static int check_non_empty_dirs(const char* path) { 3360 const char separator = *os::path_separator(); 3361 const char* const end = path + strlen(path); 3362 int nonEmptyDirs = 0; 3363 while (path < end) { 3364 const char* tmp_end = strchr(path, separator); 3365 if (tmp_end == NULL) { 3366 if (has_jar_files(path)) { 3367 nonEmptyDirs++; 3368 jio_fprintf(defaultStream::output_stream(), 3369 "Non-empty directory: %s\n", path); 3370 } 3371 path = end; 3372 } else { 3373 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3374 memcpy(dirpath, path, tmp_end - path); 3375 dirpath[tmp_end - path] = '\0'; 3376 if (has_jar_files(dirpath)) { 3377 nonEmptyDirs++; 3378 jio_fprintf(defaultStream::output_stream(), 3379 "Non-empty directory: %s\n", dirpath); 3380 } 3381 FREE_C_HEAP_ARRAY(char, dirpath); 3382 path = tmp_end + 1; 3383 } 3384 } 3385 return nonEmptyDirs; 3386 } 3387 3388 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3389 // check if the default lib/endorsed directory exists; if so, error 3390 char path[JVM_MAXPATHLEN]; 3391 const char* fileSep = os::file_separator(); 3392 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3393 3394 if (CheckEndorsedAndExtDirs) { 3395 int nonEmptyDirs = 0; 3396 // check endorsed directory 3397 nonEmptyDirs += check_non_empty_dirs(path); 3398 // check the extension directories 3399 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3400 if (nonEmptyDirs > 0) { 3401 return JNI_ERR; 3402 } 3403 } 3404 3405 DIR* dir = os::opendir(path); 3406 if (dir != NULL) { 3407 jio_fprintf(defaultStream::output_stream(), 3408 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3409 "in modular form will be supported via the concept of upgradeable modules.\n"); 3410 os::closedir(dir); 3411 return JNI_ERR; 3412 } 3413 3414 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3415 dir = os::opendir(path); 3416 if (dir != NULL) { 3417 jio_fprintf(defaultStream::output_stream(), 3418 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3419 "Use -classpath instead.\n."); 3420 os::closedir(dir); 3421 return JNI_ERR; 3422 } 3423 3424 if (scp_assembly_required) { 3425 // Assemble the bootclasspath elements into the final path. 3426 char *combined_path = scp_p->combined_path(); 3427 Arguments::set_sysclasspath(combined_path); 3428 FREE_C_HEAP_ARRAY(char, combined_path); 3429 } 3430 3431 // This must be done after all arguments have been processed. 3432 // java_compiler() true means set to "NONE" or empty. 3433 if (java_compiler() && !xdebug_mode()) { 3434 // For backwards compatibility, we switch to interpreted mode if 3435 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3436 // not specified. 3437 set_mode_flags(_int); 3438 } 3439 3440 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3441 // but like -Xint, leave compilation thresholds unaffected. 3442 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3443 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3444 set_mode_flags(_int); 3445 } 3446 3447 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3448 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3449 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3450 } 3451 3452 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3453 // Don't degrade server performance for footprint 3454 if (FLAG_IS_DEFAULT(UseLargePages) && 3455 MaxHeapSize < LargePageHeapSizeThreshold) { 3456 // No need for large granularity pages w/small heaps. 3457 // Note that large pages are enabled/disabled for both the 3458 // Java heap and the code cache. 3459 FLAG_SET_DEFAULT(UseLargePages, false); 3460 } 3461 3462 #elif defined(COMPILER2) 3463 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3464 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3465 } 3466 #endif 3467 3468 #ifndef TIERED 3469 // Tiered compilation is undefined. 3470 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3471 #endif 3472 3473 // If we are running in a headless jre, force java.awt.headless property 3474 // to be true unless the property has already been set. 3475 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3476 if (os::is_headless_jre()) { 3477 const char* headless = Arguments::get_property("java.awt.headless"); 3478 if (headless == NULL) { 3479 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3480 if (headless_env == NULL) { 3481 if (!add_property("java.awt.headless=true")) { 3482 return JNI_ENOMEM; 3483 } 3484 } else { 3485 char buffer[256]; 3486 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3487 if (!add_property(buffer)) { 3488 return JNI_ENOMEM; 3489 } 3490 } 3491 } 3492 } 3493 3494 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3495 // CMS can only be used with ParNew 3496 FLAG_SET_ERGO(bool, UseParNewGC, true); 3497 } 3498 3499 if (!check_vm_args_consistency()) { 3500 return JNI_ERR; 3501 } 3502 3503 return JNI_OK; 3504 } 3505 3506 // Helper class for controlling the lifetime of JavaVMInitArgs 3507 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3508 // deleted on the destruction of the ScopedVMInitArgs object. 3509 class ScopedVMInitArgs : public StackObj { 3510 private: 3511 JavaVMInitArgs _args; 3512 char* _container_name; 3513 bool _is_set; 3514 char* _vm_options_file_arg; 3515 3516 public: 3517 ScopedVMInitArgs(const char *container_name) { 3518 _args.version = JNI_VERSION_1_2; 3519 _args.nOptions = 0; 3520 _args.options = NULL; 3521 _args.ignoreUnrecognized = false; 3522 _container_name = (char *)container_name; 3523 _is_set = false; 3524 _vm_options_file_arg = NULL; 3525 } 3526 3527 // Populates the JavaVMInitArgs object represented by this 3528 // ScopedVMInitArgs object with the arguments in options. The 3529 // allocated memory is deleted by the destructor. If this method 3530 // returns anything other than JNI_OK, then this object is in a 3531 // partially constructed state, and should be abandoned. 3532 jint set_args(GrowableArray<JavaVMOption>* options) { 3533 _is_set = true; 3534 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3535 JavaVMOption, options->length(), mtInternal); 3536 if (options_arr == NULL) { 3537 return JNI_ENOMEM; 3538 } 3539 _args.options = options_arr; 3540 3541 for (int i = 0; i < options->length(); i++) { 3542 options_arr[i] = options->at(i); 3543 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3544 if (options_arr[i].optionString == NULL) { 3545 // Rely on the destructor to do cleanup. 3546 _args.nOptions = i; 3547 return JNI_ENOMEM; 3548 } 3549 } 3550 3551 _args.nOptions = options->length(); 3552 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3553 return JNI_OK; 3554 } 3555 3556 JavaVMInitArgs* get() { return &_args; } 3557 char* container_name() { return _container_name; } 3558 bool is_set() { return _is_set; } 3559 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3560 char* vm_options_file_arg() { return _vm_options_file_arg; } 3561 3562 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3563 if (_vm_options_file_arg != NULL) { 3564 os::free(_vm_options_file_arg); 3565 } 3566 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3567 } 3568 3569 ~ScopedVMInitArgs() { 3570 if (_vm_options_file_arg != NULL) { 3571 os::free(_vm_options_file_arg); 3572 } 3573 if (_args.options == NULL) return; 3574 for (int i = 0; i < _args.nOptions; i++) { 3575 os::free(_args.options[i].optionString); 3576 } 3577 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3578 } 3579 3580 // Insert options into this option list, to replace option at 3581 // vm_options_file_pos (-XX:VMOptionsFile) 3582 jint insert(const JavaVMInitArgs* args, 3583 const JavaVMInitArgs* args_to_insert, 3584 const int vm_options_file_pos) { 3585 assert(_args.options == NULL, "shouldn't be set yet"); 3586 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3587 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3588 3589 int length = args->nOptions + args_to_insert->nOptions - 1; 3590 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) 3591 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3592 for (int i = 0; i < args->nOptions; i++) { 3593 if (i == vm_options_file_pos) { 3594 // insert the new options starting at the same place as the 3595 // -XX:VMOptionsFile option 3596 for (int j = 0; j < args_to_insert->nOptions; j++) { 3597 options->push(args_to_insert->options[j]); 3598 } 3599 } else { 3600 options->push(args->options[i]); 3601 } 3602 } 3603 // make into options array 3604 jint result = set_args(options); 3605 delete options; 3606 return result; 3607 } 3608 }; 3609 3610 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3611 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3612 } 3613 3614 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3615 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3616 } 3617 3618 jint Arguments::parse_options_environment_variable(const char* name, 3619 ScopedVMInitArgs* vm_args) { 3620 char *buffer = ::getenv(name); 3621 3622 // Don't check this environment variable if user has special privileges 3623 // (e.g. unix su command). 3624 if (buffer == NULL || os::have_special_privileges()) { 3625 return JNI_OK; 3626 } 3627 3628 if ((buffer = os::strdup(buffer)) == NULL) { 3629 return JNI_ENOMEM; 3630 } 3631 3632 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3633 3634 os::free(buffer); 3635 return retcode; 3636 } 3637 3638 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3639 // read file into buffer 3640 int fd = ::open(file_name, O_RDONLY); 3641 if (fd < 0) { 3642 jio_fprintf(defaultStream::error_stream(), 3643 "Could not open options file '%s'\n", 3644 file_name); 3645 return JNI_ERR; 3646 } 3647 3648 struct stat stbuf; 3649 int retcode = os::stat(file_name, &stbuf); 3650 if (retcode != 0) { 3651 jio_fprintf(defaultStream::error_stream(), 3652 "Could not stat options file '%s'\n", 3653 file_name); 3654 os::close(fd); 3655 return JNI_ERR; 3656 } 3657 3658 if (stbuf.st_size == 0) { 3659 // tell caller there is no option data and that is ok 3660 os::close(fd); 3661 return JNI_OK; 3662 } 3663 3664 // '+ 1' for NULL termination even with max bytes 3665 size_t bytes_alloc = stbuf.st_size + 1; 3666 3667 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal); 3668 if (NULL == buf) { 3669 jio_fprintf(defaultStream::error_stream(), 3670 "Could not allocate read buffer for options file parse\n"); 3671 os::close(fd); 3672 return JNI_ENOMEM; 3673 } 3674 3675 memset(buf, 0, bytes_alloc); 3676 3677 // Fill buffer 3678 // Use ::read() instead of os::read because os::read() 3679 // might do a thread state transition 3680 // and it is too early for that here 3681 3682 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3683 os::close(fd); 3684 if (bytes_read < 0) { 3685 FREE_C_HEAP_ARRAY(char, buf); 3686 jio_fprintf(defaultStream::error_stream(), 3687 "Could not read options file '%s'\n", file_name); 3688 return JNI_ERR; 3689 } 3690 3691 if (bytes_read == 0) { 3692 // tell caller there is no option data and that is ok 3693 FREE_C_HEAP_ARRAY(char, buf); 3694 return JNI_OK; 3695 } 3696 3697 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3698 3699 FREE_C_HEAP_ARRAY(char, buf); 3700 return retcode; 3701 } 3702 3703 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3704 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3705 3706 // some pointers to help with parsing 3707 char *buffer_end = buffer + buf_len; 3708 char *opt_hd = buffer; 3709 char *wrt = buffer; 3710 char *rd = buffer; 3711 3712 // parse all options 3713 while (rd < buffer_end) { 3714 // skip leading white space from the input string 3715 while (rd < buffer_end && isspace(*rd)) { 3716 rd++; 3717 } 3718 3719 if (rd >= buffer_end) { 3720 break; 3721 } 3722 3723 // Remember this is where we found the head of the token. 3724 opt_hd = wrt; 3725 3726 // Tokens are strings of non white space characters separated 3727 // by one or more white spaces. 3728 while (rd < buffer_end && !isspace(*rd)) { 3729 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3730 int quote = *rd; // matching quote to look for 3731 rd++; // don't copy open quote 3732 while (rd < buffer_end && *rd != quote) { 3733 // include everything (even spaces) 3734 // up until the close quote 3735 *wrt++ = *rd++; // copy to option string 3736 } 3737 3738 if (rd < buffer_end) { 3739 rd++; // don't copy close quote 3740 } else { 3741 // did not see closing quote 3742 jio_fprintf(defaultStream::error_stream(), 3743 "Unmatched quote in %s\n", name); 3744 delete options; 3745 return JNI_ERR; 3746 } 3747 } else { 3748 *wrt++ = *rd++; // copy to option string 3749 } 3750 } 3751 3752 // steal a white space character and set it to NULL 3753 *wrt++ = '\0'; 3754 // We now have a complete token 3755 3756 JavaVMOption option; 3757 option.optionString = opt_hd; 3758 option.extraInfo = NULL; 3759 3760 options->append(option); // Fill in option 3761 3762 rd++; // Advance to next character 3763 } 3764 3765 // Fill out JavaVMInitArgs structure. 3766 jint status = vm_args->set_args(options); 3767 3768 delete options; 3769 return status; 3770 } 3771 3772 void Arguments::set_shared_spaces_flags() { 3773 if (DumpSharedSpaces) { 3774 if (RequireSharedSpaces) { 3775 warning("Cannot dump shared archive while using shared archive"); 3776 } 3777 UseSharedSpaces = false; 3778 #ifdef _LP64 3779 if (!UseCompressedOops || !UseCompressedClassPointers) { 3780 vm_exit_during_initialization( 3781 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3782 } 3783 } else { 3784 if (!UseCompressedOops || !UseCompressedClassPointers) { 3785 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3786 } 3787 #endif 3788 } 3789 } 3790 3791 #if !INCLUDE_ALL_GCS 3792 static void force_serial_gc() { 3793 FLAG_SET_DEFAULT(UseSerialGC, true); 3794 UNSUPPORTED_GC_OPTION(UseG1GC); 3795 UNSUPPORTED_GC_OPTION(UseParallelGC); 3796 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3797 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3798 UNSUPPORTED_GC_OPTION(UseParNewGC); 3799 } 3800 #endif // INCLUDE_ALL_GCS 3801 3802 // Sharing support 3803 // Construct the path to the archive 3804 static char* get_shared_archive_path() { 3805 char *shared_archive_path; 3806 if (SharedArchiveFile == NULL) { 3807 char jvm_path[JVM_MAXPATHLEN]; 3808 os::jvm_path(jvm_path, sizeof(jvm_path)); 3809 char *end = strrchr(jvm_path, *os::file_separator()); 3810 if (end != NULL) *end = '\0'; 3811 size_t jvm_path_len = strlen(jvm_path); 3812 size_t file_sep_len = strlen(os::file_separator()); 3813 const size_t len = jvm_path_len + file_sep_len + 20; 3814 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3815 if (shared_archive_path != NULL) { 3816 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3817 jvm_path, os::file_separator()); 3818 } 3819 } else { 3820 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 3821 } 3822 return shared_archive_path; 3823 } 3824 3825 #ifndef PRODUCT 3826 // Determine whether LogVMOutput should be implicitly turned on. 3827 static bool use_vm_log() { 3828 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3829 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3830 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3831 PrintAssembly || TraceDeoptimization || TraceDependencies || 3832 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3833 return true; 3834 } 3835 3836 #ifdef COMPILER1 3837 if (PrintC1Statistics) { 3838 return true; 3839 } 3840 #endif // COMPILER1 3841 3842 #ifdef COMPILER2 3843 if (PrintOptoAssembly || PrintOptoStatistics) { 3844 return true; 3845 } 3846 #endif // COMPILER2 3847 3848 return false; 3849 } 3850 3851 #endif // PRODUCT 3852 3853 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3854 for (int index = 0; index < args->nOptions; index++) { 3855 const JavaVMOption* option = args->options + index; 3856 const char* tail; 3857 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3858 return true; 3859 } 3860 } 3861 return false; 3862 } 3863 3864 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3865 const char* vm_options_file, 3866 const int vm_options_file_pos, 3867 ScopedVMInitArgs* vm_options_file_args, 3868 ScopedVMInitArgs* args_out) { 3869 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3870 if (code != JNI_OK) { 3871 return code; 3872 } 3873 3874 if (vm_options_file_args->get()->nOptions < 1) { 3875 return JNI_OK; 3876 } 3877 3878 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3879 jio_fprintf(defaultStream::error_stream(), 3880 "A VM options file may not refer to a VM options file. " 3881 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3882 "options file '%s' in options container '%s' is an error.\n", 3883 vm_options_file_args->vm_options_file_arg(), 3884 vm_options_file_args->container_name()); 3885 return JNI_EINVAL; 3886 } 3887 3888 return args_out->insert(args, vm_options_file_args->get(), 3889 vm_options_file_pos); 3890 } 3891 3892 // Expand -XX:VMOptionsFile found in args_in as needed. 3893 // mod_args and args_out parameters may return values as needed. 3894 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3895 ScopedVMInitArgs* mod_args, 3896 JavaVMInitArgs** args_out) { 3897 jint code = match_special_option_and_act(args_in, mod_args); 3898 if (code != JNI_OK) { 3899 return code; 3900 } 3901 3902 if (mod_args->is_set()) { 3903 // args_in contains -XX:VMOptionsFile and mod_args contains the 3904 // original options from args_in along with the options expanded 3905 // from the VMOptionsFile. Return a short-hand to the caller. 3906 *args_out = mod_args->get(); 3907 } else { 3908 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3909 } 3910 return JNI_OK; 3911 } 3912 3913 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3914 ScopedVMInitArgs* args_out) { 3915 // Remaining part of option string 3916 const char* tail; 3917 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3918 3919 for (int index = 0; index < args->nOptions; index++) { 3920 const JavaVMOption* option = args->options + index; 3921 if (ArgumentsExt::process_options(option)) { 3922 continue; 3923 } 3924 if (match_option(option, "-XX:Flags=", &tail)) { 3925 Arguments::set_jvm_flags_file(tail); 3926 continue; 3927 } 3928 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3929 if (vm_options_file_args.found_vm_options_file_arg()) { 3930 jio_fprintf(defaultStream::error_stream(), 3931 "The option '%s' is already specified in the options " 3932 "container '%s' so the specification of '%s' in the " 3933 "same options container is an error.\n", 3934 vm_options_file_args.vm_options_file_arg(), 3935 vm_options_file_args.container_name(), 3936 option->optionString); 3937 return JNI_EINVAL; 3938 } 3939 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3940 // If there's a VMOptionsFile, parse that 3941 jint code = insert_vm_options_file(args, tail, index, 3942 &vm_options_file_args, args_out); 3943 if (code != JNI_OK) { 3944 return code; 3945 } 3946 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3947 if (args_out->is_set()) { 3948 // The VMOptions file inserted some options so switch 'args' 3949 // to the new set of options, and continue processing which 3950 // preserves "last option wins" semantics. 3951 args = args_out->get(); 3952 // The first option from the VMOptionsFile replaces the 3953 // current option. So we back track to process the 3954 // replacement option. 3955 index--; 3956 } 3957 continue; 3958 } 3959 if (match_option(option, "-XX:+PrintVMOptions")) { 3960 PrintVMOptions = true; 3961 continue; 3962 } 3963 if (match_option(option, "-XX:-PrintVMOptions")) { 3964 PrintVMOptions = false; 3965 continue; 3966 } 3967 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3968 IgnoreUnrecognizedVMOptions = true; 3969 continue; 3970 } 3971 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3972 IgnoreUnrecognizedVMOptions = false; 3973 continue; 3974 } 3975 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3976 CommandLineFlags::printFlags(tty, false); 3977 vm_exit(0); 3978 } 3979 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3980 #if INCLUDE_NMT 3981 // The launcher did not setup nmt environment variable properly. 3982 if (!MemTracker::check_launcher_nmt_support(tail)) { 3983 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3984 } 3985 3986 // Verify if nmt option is valid. 3987 if (MemTracker::verify_nmt_option()) { 3988 // Late initialization, still in single-threaded mode. 3989 if (MemTracker::tracking_level() >= NMT_summary) { 3990 MemTracker::init(); 3991 } 3992 } else { 3993 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3994 } 3995 continue; 3996 #else 3997 jio_fprintf(defaultStream::error_stream(), 3998 "Native Memory Tracking is not supported in this VM\n"); 3999 return JNI_ERR; 4000 #endif 4001 } 4002 4003 #ifndef PRODUCT 4004 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4005 CommandLineFlags::printFlags(tty, true); 4006 vm_exit(0); 4007 } 4008 #endif 4009 } 4010 return JNI_OK; 4011 } 4012 4013 static void print_options(const JavaVMInitArgs *args) { 4014 const char* tail; 4015 for (int index = 0; index < args->nOptions; index++) { 4016 const JavaVMOption *option = args->options + index; 4017 if (match_option(option, "-XX:", &tail)) { 4018 logOption(tail); 4019 } 4020 } 4021 } 4022 4023 bool Arguments::handle_deprecated_print_gc_flags() { 4024 if (PrintGC) { 4025 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4026 } 4027 if (PrintGCDetails) { 4028 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4029 } 4030 4031 if (_gc_log_filename != NULL) { 4032 // -Xloggc was used to specify a filename 4033 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4034 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL); 4035 } else if (PrintGC || PrintGCDetails) { 4036 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4037 } 4038 return true; 4039 } 4040 4041 // Parse entry point called from JNI_CreateJavaVM 4042 4043 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4044 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4045 4046 // Initialize ranges and constraints 4047 CommandLineFlagRangeList::init(); 4048 CommandLineFlagConstraintList::init(); 4049 4050 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4051 const char* hotspotrc = ".hotspotrc"; 4052 bool settings_file_specified = false; 4053 bool needs_hotspotrc_warning = false; 4054 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4055 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4056 4057 // Pointers to current working set of containers 4058 JavaVMInitArgs* cur_cmd_args; 4059 JavaVMInitArgs* cur_java_options_args; 4060 JavaVMInitArgs* cur_java_tool_options_args; 4061 4062 // Containers for modified/expanded options 4063 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4064 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4065 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4066 4067 4068 jint code = 4069 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4070 if (code != JNI_OK) { 4071 return code; 4072 } 4073 4074 code = parse_java_options_environment_variable(&initial_java_options_args); 4075 if (code != JNI_OK) { 4076 return code; 4077 } 4078 4079 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4080 &mod_java_tool_options_args, 4081 &cur_java_tool_options_args); 4082 if (code != JNI_OK) { 4083 return code; 4084 } 4085 4086 code = expand_vm_options_as_needed(initial_cmd_args, 4087 &mod_cmd_args, 4088 &cur_cmd_args); 4089 if (code != JNI_OK) { 4090 return code; 4091 } 4092 4093 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4094 &mod_java_options_args, 4095 &cur_java_options_args); 4096 if (code != JNI_OK) { 4097 return code; 4098 } 4099 4100 const char* flags_file = Arguments::get_jvm_flags_file(); 4101 settings_file_specified = (flags_file != NULL); 4102 4103 if (IgnoreUnrecognizedVMOptions) { 4104 cur_cmd_args->ignoreUnrecognized = true; 4105 cur_java_tool_options_args->ignoreUnrecognized = true; 4106 cur_java_options_args->ignoreUnrecognized = true; 4107 } 4108 4109 // Parse specified settings file 4110 if (settings_file_specified) { 4111 if (!process_settings_file(flags_file, true, 4112 cur_cmd_args->ignoreUnrecognized)) { 4113 return JNI_EINVAL; 4114 } 4115 } else { 4116 #ifdef ASSERT 4117 // Parse default .hotspotrc settings file 4118 if (!process_settings_file(".hotspotrc", false, 4119 cur_cmd_args->ignoreUnrecognized)) { 4120 return JNI_EINVAL; 4121 } 4122 #else 4123 struct stat buf; 4124 if (os::stat(hotspotrc, &buf) == 0) { 4125 needs_hotspotrc_warning = true; 4126 } 4127 #endif 4128 } 4129 4130 if (PrintVMOptions) { 4131 print_options(cur_java_tool_options_args); 4132 print_options(cur_cmd_args); 4133 print_options(cur_java_options_args); 4134 } 4135 4136 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4137 jint result = parse_vm_init_args(cur_java_tool_options_args, 4138 cur_java_options_args, 4139 cur_cmd_args); 4140 4141 if (result != JNI_OK) { 4142 return result; 4143 } 4144 4145 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4146 SharedArchivePath = get_shared_archive_path(); 4147 if (SharedArchivePath == NULL) { 4148 return JNI_ENOMEM; 4149 } 4150 4151 // Set up VerifySharedSpaces 4152 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4153 VerifySharedSpaces = true; 4154 } 4155 4156 // Delay warning until here so that we've had a chance to process 4157 // the -XX:-PrintWarnings flag 4158 if (needs_hotspotrc_warning) { 4159 warning("%s file is present but has been ignored. " 4160 "Run with -XX:Flags=%s to load the file.", 4161 hotspotrc, hotspotrc); 4162 } 4163 4164 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4165 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 4166 #endif 4167 4168 ArgumentsExt::report_unsupported_options(); 4169 4170 #ifndef PRODUCT 4171 if (TraceBytecodesAt != 0) { 4172 TraceBytecodes = true; 4173 } 4174 if (CountCompiledCalls) { 4175 if (UseCounterDecay) { 4176 warning("UseCounterDecay disabled because CountCalls is set"); 4177 UseCounterDecay = false; 4178 } 4179 } 4180 #endif // PRODUCT 4181 4182 if (ScavengeRootsInCode == 0) { 4183 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4184 warning("Forcing ScavengeRootsInCode non-zero"); 4185 } 4186 ScavengeRootsInCode = 1; 4187 } 4188 4189 if (!handle_deprecated_print_gc_flags()) { 4190 return JNI_EINVAL; 4191 } 4192 4193 // Set object alignment values. 4194 set_object_alignment(); 4195 4196 #if !INCLUDE_ALL_GCS 4197 force_serial_gc(); 4198 #endif // INCLUDE_ALL_GCS 4199 #if !INCLUDE_CDS 4200 if (DumpSharedSpaces || RequireSharedSpaces) { 4201 jio_fprintf(defaultStream::error_stream(), 4202 "Shared spaces are not supported in this VM\n"); 4203 return JNI_ERR; 4204 } 4205 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4206 warning("Shared spaces are not supported in this VM"); 4207 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4208 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4209 } 4210 no_shared_spaces("CDS Disabled"); 4211 #endif // INCLUDE_CDS 4212 4213 return JNI_OK; 4214 } 4215 4216 jint Arguments::apply_ergo() { 4217 4218 // Set flags based on ergonomics. 4219 set_ergonomics_flags(); 4220 4221 set_shared_spaces_flags(); 4222 4223 // Check the GC selections again. 4224 if (!check_gc_consistency()) { 4225 return JNI_EINVAL; 4226 } 4227 4228 if (TieredCompilation) { 4229 set_tiered_flags(); 4230 } else { 4231 int max_compilation_policy_choice = 1; 4232 #ifdef COMPILER2 4233 max_compilation_policy_choice = 2; 4234 #endif 4235 // Check if the policy is valid. 4236 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4237 vm_exit_during_initialization( 4238 "Incompatible compilation policy selected", NULL); 4239 } 4240 // Scale CompileThreshold 4241 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4242 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4243 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4244 } 4245 } 4246 4247 #ifdef COMPILER2 4248 #ifndef PRODUCT 4249 if (PrintIdealGraphLevel > 0) { 4250 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4251 } 4252 #endif 4253 #endif 4254 4255 // Set heap size based on available physical memory 4256 set_heap_size(); 4257 4258 ArgumentsExt::set_gc_specific_flags(); 4259 4260 // Initialize Metaspace flags and alignments 4261 Metaspace::ergo_initialize(); 4262 4263 // Set bytecode rewriting flags 4264 set_bytecode_flags(); 4265 4266 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4267 jint code = set_aggressive_opts_flags(); 4268 if (code != JNI_OK) { 4269 return code; 4270 } 4271 4272 // Turn off biased locking for locking debug mode flags, 4273 // which are subtly different from each other but neither works with 4274 // biased locking 4275 if (UseHeavyMonitors 4276 #ifdef COMPILER1 4277 || !UseFastLocking 4278 #endif // COMPILER1 4279 #if INCLUDE_JVMCI 4280 || !JVMCIUseFastLocking 4281 #endif 4282 ) { 4283 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4284 // flag set to true on command line; warn the user that they 4285 // can't enable biased locking here 4286 warning("Biased Locking is not supported with locking debug flags" 4287 "; ignoring UseBiasedLocking flag." ); 4288 } 4289 UseBiasedLocking = false; 4290 } 4291 4292 #ifdef CC_INTERP 4293 // Clear flags not supported on zero. 4294 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4295 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4296 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4297 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4298 #endif // CC_INTERP 4299 4300 #ifdef COMPILER2 4301 if (!EliminateLocks) { 4302 EliminateNestedLocks = false; 4303 } 4304 if (!Inline) { 4305 IncrementalInline = false; 4306 } 4307 #ifndef PRODUCT 4308 if (!IncrementalInline) { 4309 AlwaysIncrementalInline = false; 4310 } 4311 #endif 4312 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4313 // nothing to use the profiling, turn if off 4314 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4315 } 4316 #endif 4317 4318 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4319 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4320 DebugNonSafepoints = true; 4321 } 4322 4323 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4324 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4325 } 4326 4327 #ifndef PRODUCT 4328 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4329 if (use_vm_log()) { 4330 LogVMOutput = true; 4331 } 4332 } 4333 #endif // PRODUCT 4334 4335 if (PrintCommandLineFlags) { 4336 CommandLineFlags::printSetFlags(tty); 4337 } 4338 4339 // Apply CPU specific policy for the BiasedLocking 4340 if (UseBiasedLocking) { 4341 if (!VM_Version::use_biased_locking() && 4342 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4343 UseBiasedLocking = false; 4344 } 4345 } 4346 #ifdef COMPILER2 4347 if (!UseBiasedLocking || EmitSync != 0) { 4348 UseOptoBiasInlining = false; 4349 } 4350 #endif 4351 4352 #ifndef TARGET_ARCH_x86 // Some macroasm missing at this stage 4353 EnableExtraSuper = false; 4354 #endif 4355 4356 return JNI_OK; 4357 } 4358 4359 jint Arguments::adjust_after_os() { 4360 if (UseNUMA) { 4361 if (UseParallelGC || UseParallelOldGC) { 4362 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4363 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4364 } 4365 } 4366 // UseNUMAInterleaving is set to ON for all collectors and 4367 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4368 // such as the parallel collector for Linux and Solaris will 4369 // interleave old gen and survivor spaces on top of NUMA 4370 // allocation policy for the eden space. 4371 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4372 // all platforms and ParallelGC on Windows will interleave all 4373 // of the heap spaces across NUMA nodes. 4374 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4375 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4376 } 4377 } 4378 return JNI_OK; 4379 } 4380 4381 int Arguments::PropertyList_count(SystemProperty* pl) { 4382 int count = 0; 4383 while(pl != NULL) { 4384 count++; 4385 pl = pl->next(); 4386 } 4387 return count; 4388 } 4389 4390 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4391 assert(key != NULL, "just checking"); 4392 SystemProperty* prop; 4393 for (prop = pl; prop != NULL; prop = prop->next()) { 4394 if (strcmp(key, prop->key()) == 0) return prop->value(); 4395 } 4396 return NULL; 4397 } 4398 4399 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4400 int count = 0; 4401 const char* ret_val = NULL; 4402 4403 while(pl != NULL) { 4404 if(count >= index) { 4405 ret_val = pl->key(); 4406 break; 4407 } 4408 count++; 4409 pl = pl->next(); 4410 } 4411 4412 return ret_val; 4413 } 4414 4415 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4416 int count = 0; 4417 char* ret_val = NULL; 4418 4419 while(pl != NULL) { 4420 if(count >= index) { 4421 ret_val = pl->value(); 4422 break; 4423 } 4424 count++; 4425 pl = pl->next(); 4426 } 4427 4428 return ret_val; 4429 } 4430 4431 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4432 SystemProperty* p = *plist; 4433 if (p == NULL) { 4434 *plist = new_p; 4435 } else { 4436 while (p->next() != NULL) { 4437 p = p->next(); 4438 } 4439 p->set_next(new_p); 4440 } 4441 } 4442 4443 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) { 4444 if (plist == NULL) 4445 return; 4446 4447 SystemProperty* new_p = new SystemProperty(k, v, true); 4448 PropertyList_add(plist, new_p); 4449 } 4450 4451 void Arguments::PropertyList_add(SystemProperty *element) { 4452 PropertyList_add(&_system_properties, element); 4453 } 4454 4455 // This add maintains unique property key in the list. 4456 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) { 4457 if (plist == NULL) 4458 return; 4459 4460 // If property key exist then update with new value. 4461 SystemProperty* prop; 4462 for (prop = *plist; prop != NULL; prop = prop->next()) { 4463 if (strcmp(k, prop->key()) == 0) { 4464 if (append) { 4465 prop->append_value(v); 4466 } else { 4467 prop->set_value(v); 4468 } 4469 return; 4470 } 4471 } 4472 4473 PropertyList_add(plist, k, v); 4474 } 4475 4476 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4477 // Returns true if all of the source pointed by src has been copied over to 4478 // the destination buffer pointed by buf. Otherwise, returns false. 4479 // Notes: 4480 // 1. If the length (buflen) of the destination buffer excluding the 4481 // NULL terminator character is not long enough for holding the expanded 4482 // pid characters, it also returns false instead of returning the partially 4483 // expanded one. 4484 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4485 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4486 char* buf, size_t buflen) { 4487 const char* p = src; 4488 char* b = buf; 4489 const char* src_end = &src[srclen]; 4490 char* buf_end = &buf[buflen - 1]; 4491 4492 while (p < src_end && b < buf_end) { 4493 if (*p == '%') { 4494 switch (*(++p)) { 4495 case '%': // "%%" ==> "%" 4496 *b++ = *p++; 4497 break; 4498 case 'p': { // "%p" ==> current process id 4499 // buf_end points to the character before the last character so 4500 // that we could write '\0' to the end of the buffer. 4501 size_t buf_sz = buf_end - b + 1; 4502 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4503 4504 // if jio_snprintf fails or the buffer is not long enough to hold 4505 // the expanded pid, returns false. 4506 if (ret < 0 || ret >= (int)buf_sz) { 4507 return false; 4508 } else { 4509 b += ret; 4510 assert(*b == '\0', "fail in copy_expand_pid"); 4511 if (p == src_end && b == buf_end + 1) { 4512 // reach the end of the buffer. 4513 return true; 4514 } 4515 } 4516 p++; 4517 break; 4518 } 4519 default : 4520 *b++ = '%'; 4521 } 4522 } else { 4523 *b++ = *p++; 4524 } 4525 } 4526 *b = '\0'; 4527 return (p == src_end); // return false if not all of the source was copied 4528 }