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