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/logConfiguration.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "memory/universe.inline.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "prims/jvmtiExport.hpp" 41 #include "runtime/arguments.hpp" 42 #include "runtime/arguments_ext.hpp" 43 #include "runtime/commandLineFlagConstraintList.hpp" 44 #include "runtime/commandLineFlagRangeList.hpp" 45 #include "runtime/globals.hpp" 46 #include "runtime/globals_extension.hpp" 47 #include "runtime/java.hpp" 48 #include "runtime/os.hpp" 49 #include "runtime/vm_version.hpp" 50 #include "services/management.hpp" 51 #include "services/memTracker.hpp" 52 #include "utilities/defaultStream.hpp" 53 #include "utilities/macros.hpp" 54 #include "utilities/stringUtils.hpp" 55 #if INCLUDE_JVMCI 56 #include "jvmci/jvmciRuntime.hpp" 57 #endif 58 #if INCLUDE_ALL_GCS 59 #include "gc/cms/compactibleFreeListSpace.hpp" 60 #include "gc/g1/g1CollectedHeap.inline.hpp" 61 #include "gc/parallel/parallelScavengeHeap.hpp" 62 #endif // INCLUDE_ALL_GCS 63 64 // Note: This is a special bug reporting site for the JVM 65 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 66 #define DEFAULT_JAVA_LAUNCHER "generic" 67 68 #define UNSUPPORTED_GC_OPTION(gc) \ 69 do { \ 70 if (gc) { \ 71 if (FLAG_IS_CMDLINE(gc)) { \ 72 warning(#gc " is not supported in this VM. Using Serial GC."); \ 73 } \ 74 FLAG_SET_DEFAULT(gc, false); \ 75 } \ 76 } while(0) 77 78 char** Arguments::_jvm_flags_array = NULL; 79 int Arguments::_num_jvm_flags = 0; 80 char** Arguments::_jvm_args_array = NULL; 81 int Arguments::_num_jvm_args = 0; 82 char* Arguments::_java_command = NULL; 83 SystemProperty* Arguments::_system_properties = NULL; 84 const char* Arguments::_gc_log_filename = NULL; 85 bool Arguments::_has_profile = false; 86 size_t Arguments::_conservative_max_heap_alignment = 0; 87 size_t Arguments::_min_heap_size = 0; 88 Arguments::Mode Arguments::_mode = _mixed; 89 bool Arguments::_java_compiler = false; 90 bool Arguments::_xdebug_mode = false; 91 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 92 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 93 int Arguments::_sun_java_launcher_pid = -1; 94 bool Arguments::_sun_java_launcher_is_altjvm = false; 95 96 // These parameters are reset in method parse_vm_init_args() 97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 99 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 100 bool Arguments::_ClipInlining = ClipInlining; 101 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 102 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 103 104 char* Arguments::SharedArchivePath = NULL; 105 106 AgentLibraryList Arguments::_libraryList; 107 AgentLibraryList Arguments::_agentList; 108 109 abort_hook_t Arguments::_abort_hook = NULL; 110 exit_hook_t Arguments::_exit_hook = NULL; 111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 112 113 114 SystemProperty *Arguments::_sun_boot_library_path = NULL; 115 SystemProperty *Arguments::_java_library_path = NULL; 116 SystemProperty *Arguments::_java_home = NULL; 117 SystemProperty *Arguments::_java_class_path = NULL; 118 SystemProperty *Arguments::_sun_boot_class_path = NULL; 119 120 char* Arguments::_ext_dirs = NULL; 121 122 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 123 // part of the option string. 124 static bool match_option(const JavaVMOption *option, const char* name, 125 const char** tail) { 126 size_t len = strlen(name); 127 if (strncmp(option->optionString, name, len) == 0) { 128 *tail = option->optionString + len; 129 return true; 130 } else { 131 return false; 132 } 133 } 134 135 // Check if 'option' matches 'name'. No "tail" is allowed. 136 static bool match_option(const JavaVMOption *option, const char* name) { 137 const char* tail = NULL; 138 bool result = match_option(option, name, &tail); 139 if (tail != NULL && *tail == '\0') { 140 return result; 141 } else { 142 return false; 143 } 144 } 145 146 // Return true if any of the strings in null-terminated array 'names' matches. 147 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 148 // the option must match exactly. 149 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 150 bool tail_allowed) { 151 for (/* empty */; *names != NULL; ++names) { 152 if (match_option(option, *names, tail)) { 153 if (**tail == '\0' || tail_allowed && **tail == ':') { 154 return true; 155 } 156 } 157 } 158 return false; 159 } 160 161 static void logOption(const char* opt) { 162 if (PrintVMOptions) { 163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 164 } 165 } 166 167 // Process java launcher properties. 168 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 169 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 170 // sun.java.launcher.pid is defined. 171 // Must do this before setting up other system properties, 172 // as some of them may depend on launcher type. 173 for (int index = 0; index < args->nOptions; index++) { 174 const JavaVMOption* option = args->options + index; 175 const char* tail; 176 177 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 178 process_java_launcher_argument(tail, option->extraInfo); 179 continue; 180 } 181 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 182 if (strcmp(tail, "true") == 0) { 183 _sun_java_launcher_is_altjvm = true; 184 } 185 continue; 186 } 187 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 188 _sun_java_launcher_pid = atoi(tail); 189 continue; 190 } 191 } 192 } 193 194 // Initialize system properties key and value. 195 void Arguments::init_system_properties() { 196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 197 "Java Virtual Machine Specification", false)); 198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 199 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 201 202 // Following are JVMTI agent writable properties. 203 // Properties values are set to NULL and they are 204 // os specific they are initialized in os::init_system_properties_values(). 205 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 206 _java_library_path = new SystemProperty("java.library.path", NULL, true); 207 _java_home = new SystemProperty("java.home", NULL, true); 208 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 209 210 _java_class_path = new SystemProperty("java.class.path", "", true); 211 212 // Add to System Property list. 213 PropertyList_add(&_system_properties, _sun_boot_library_path); 214 PropertyList_add(&_system_properties, _java_library_path); 215 PropertyList_add(&_system_properties, _java_home); 216 PropertyList_add(&_system_properties, _java_class_path); 217 PropertyList_add(&_system_properties, _sun_boot_class_path); 218 219 // Set OS specific system properties values 220 os::init_system_properties_values(); 221 222 JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);) 223 } 224 225 // Update/Initialize System properties after JDK version number is known 226 void Arguments::init_version_specific_system_properties() { 227 enum { bufsz = 16 }; 228 char buffer[bufsz]; 229 const char* spec_vendor = "Oracle Corporation"; 230 uint32_t spec_version = JDK_Version::current().major_version(); 231 232 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 233 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 236 PropertyList_add(&_system_properties, 237 new SystemProperty("java.vm.specification.version", buffer, false)); 238 PropertyList_add(&_system_properties, 239 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 240 } 241 242 /* 243 * -XX argument processing: 244 * 245 * -XX arguments are defined in several places, such as: 246 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 247 * -XX arguments are parsed in parse_argument(). 248 * -XX argument bounds checking is done in check_vm_args_consistency(). 249 * 250 * Over time -XX arguments may change. There are mechanisms to handle common cases: 251 * 252 * ALIASED: An option that is simply another name for another option. This is often 253 * part of the process of deprecating a flag, but not all aliases need 254 * to be deprecated. 255 * 256 * Create an alias for an option by adding the old and new option names to the 257 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 258 * 259 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 260 * support may be removed in the future. Both regular and aliased options may be 261 * deprecated. 262 * 263 * Add a deprecation warning for an option (or alias) by adding an entry in the 264 * "special_jvm_flags" table and setting the "deprecated_in" field. 265 * Often an option "deprecated" in one major release will 266 * be made "obsolete" in the next. In this case the entry should also have it's 267 * "obsolete_in" field set. 268 * 269 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 270 * on the command line. A warning is printed to let the user know that option might not 271 * be accepted in the future. 272 * 273 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 274 * table and setting the "obsolete_in" field. 275 * 276 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 277 * to the current JDK version. The system will flatly refuse to admit the existence of 278 * the flag. This allows a flag to die automatically over JDK releases. 279 * 280 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 281 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 282 * - Newly obsolete or expired deprecated options should have their global variable 283 * definitions removed (from globals.hpp, etc) and related implementations removed. 284 * 285 * Recommended approach for removing options: 286 * 287 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 288 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 289 * 290 * To remove internal options (e.g. diagnostic, experimental, develop options), use 291 * a 2-step model adding major release numbers to the obsolete and expire columns. 292 * 293 * To change the name of an option, use the alias table as well as a 2-step 294 * model adding major release numbers to the deprecate and expire columns. 295 * Think twice about aliasing commonly used customer options. 296 * 297 * There are times when it is appropriate to leave a future release number as undefined. 298 * 299 * Tests: Aliases should be tested in VMAliasOptions.java. 300 * Deprecated options should be tested in VMDeprecatedOptions.java. 301 */ 302 303 // Obsolete or deprecated -XX flag. 304 typedef struct { 305 const char* name; 306 JDK_Version deprecated_in; // When the deprecation warning started (or "undefined"). 307 JDK_Version obsolete_in; // When the obsolete warning started (or "undefined"). 308 JDK_Version expired_in; // When the option expires (or "undefined"). 309 } SpecialFlag; 310 311 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 312 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 313 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 314 // the command-line as usual, but will issue a warning. 315 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 316 // the command-line, while issuing a warning and ignoring the flag value. 317 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 318 // existence of the flag. 319 // 320 // MANUAL CLEANUP ON JDK VERSION UPDATES: 321 // This table ensures that the handling of options will update automatically when the JDK 322 // version is incremented, but the source code needs to be cleanup up manually: 323 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 324 // variable should be removed, as well as users of the variable. 325 // - As "deprecated" options age into "obsolete" options, move the entry into the 326 // "Obsolete Flags" section of the table. 327 // - All expired options should be removed from the table. 328 static SpecialFlag const special_jvm_flags[] = { 329 // -------------- Deprecated Flags -------------- 330 // --- Non-alias flags - sorted by obsolete_in then expired_in: 331 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 332 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 333 334 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 335 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 336 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 337 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 338 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 339 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 340 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 341 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) }, 342 343 // -------------- Obsolete Flags - sorted by expired_in -------------- 344 { "UseOldInlining", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 345 { "SafepointPollOffset", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 346 { "UseBoundThreads", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 347 { "DefaultThreadPriority", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 348 { "NoYieldsInMicrolock", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 349 { "BackEdgeThreshold", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 350 { "UseNewReflection", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 351 { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 352 { "VerifyReflectionBytecodes", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 353 { "AutoShutdownNMT", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 354 { "NmethodSweepFraction", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 355 { "NmethodSweepCheckInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 356 { "CodeCacheMinimumFreeSpace", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 357 #ifndef ZERO 358 { "UseFastAccessorMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 359 { "UseFastEmptyMethods", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 360 #endif // ZERO 361 { "UseCompilerSafepoints", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 362 { "AdaptiveSizePausePolicy", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 363 { "ParallelGCRetainPLAB", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 364 { "ThreadSafetyMargin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 365 { "LazyBootClassLoader", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 366 { "StarvationMonitorInterval", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 367 { "PreInflateSpin", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 368 { "JNIDetachReleasesMonitors", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) }, 369 370 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 371 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 372 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 373 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 374 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 375 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 376 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 377 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 378 #endif 379 380 { NULL, JDK_Version(0), JDK_Version(0) } 381 }; 382 383 // Flags that are aliases for other flags. 384 typedef struct { 385 const char* alias_name; 386 const char* real_name; 387 } AliasedFlag; 388 389 static AliasedFlag const aliased_jvm_flags[] = { 390 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 391 { "CMSMarkStackSizeMax", "MarkStackSizeMax" }, 392 { "CMSMarkStackSize", "MarkStackSize" }, 393 { "G1MarkStackSize", "MarkStackSize" }, 394 { "ParallelMarkingThreads", "ConcGCThreads" }, 395 { "ParallelCMSThreads", "ConcGCThreads" }, 396 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 397 { NULL, NULL} 398 }; 399 400 // Return true if "v" is less than "other", where "other" may be "undefined". 401 static bool version_less_than(JDK_Version v, JDK_Version other) { 402 assert(!v.is_undefined(), "must be defined"); 403 if (!other.is_undefined() && v.compare(other) >= 0) { 404 return false; 405 } else { 406 return true; 407 } 408 } 409 410 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 411 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 412 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 413 flag = special_jvm_flags[i]; 414 return true; 415 } 416 } 417 return false; 418 } 419 420 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 421 assert(version != NULL, "Must provide a version buffer"); 422 SpecialFlag flag; 423 if (lookup_special_flag(flag_name, flag)) { 424 if (!flag.obsolete_in.is_undefined()) { 425 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 426 *version = flag.obsolete_in; 427 return true; 428 } 429 } 430 } 431 return false; 432 } 433 434 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 435 assert(version != NULL, "Must provide a version buffer"); 436 SpecialFlag flag; 437 if (lookup_special_flag(flag_name, flag)) { 438 if (!flag.deprecated_in.is_undefined()) { 439 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 440 version_less_than(JDK_Version::current(), flag.expired_in)) { 441 *version = flag.deprecated_in; 442 return 1; 443 } else { 444 return -1; 445 } 446 } 447 } 448 return 0; 449 } 450 451 const char* Arguments::real_flag_name(const char *flag_name) { 452 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 453 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 454 if (strcmp(flag_status.alias_name, flag_name) == 0) { 455 return flag_status.real_name; 456 } 457 } 458 return flag_name; 459 } 460 461 #ifndef PRODUCT 462 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 463 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 464 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 465 return true; 466 } 467 } 468 return false; 469 } 470 471 static bool verify_special_jvm_flags() { 472 bool success = true; 473 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 474 const SpecialFlag& flag = special_jvm_flags[i]; 475 if (lookup_special_flag(flag.name, i)) { 476 warning("Duplicate special flag declaration \"%s\"", flag.name); 477 success = false; 478 } 479 if (flag.deprecated_in.is_undefined() && 480 flag.obsolete_in.is_undefined()) { 481 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 482 success = false; 483 } 484 485 if (!flag.deprecated_in.is_undefined()) { 486 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 487 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 488 success = false; 489 } 490 491 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 492 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 493 success = false; 494 } 495 } 496 497 if (!flag.obsolete_in.is_undefined()) { 498 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 499 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 500 success = false; 501 } 502 503 // if flag has become obsolete it should not have a "globals" flag defined anymore. 504 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 505 if (Flag::find_flag(flag.name) != NULL) { 506 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 507 success = false; 508 } 509 } 510 } 511 512 if (!flag.expired_in.is_undefined()) { 513 // if flag has become expired it should not have a "globals" flag defined anymore. 514 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 515 if (Flag::find_flag(flag.name) != NULL) { 516 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 517 success = false; 518 } 519 } 520 } 521 522 } 523 return success; 524 } 525 #endif 526 527 // Constructs the system class path (aka boot class path) from the following 528 // components, in order: 529 // 530 // prefix // from -Xbootclasspath/p:... 531 // base // from os::get_system_properties() or -Xbootclasspath= 532 // suffix // from -Xbootclasspath/a:... 533 // 534 // This could be AllStatic, but it isn't needed after argument processing is 535 // complete. 536 class SysClassPath: public StackObj { 537 public: 538 SysClassPath(const char* base); 539 ~SysClassPath(); 540 541 inline void set_base(const char* base); 542 inline void add_prefix(const char* prefix); 543 inline void add_suffix_to_prefix(const char* suffix); 544 inline void add_suffix(const char* suffix); 545 inline void reset_path(const char* base); 546 547 inline const char* get_base() const { return _items[_scp_base]; } 548 inline const char* get_prefix() const { return _items[_scp_prefix]; } 549 inline const char* get_suffix() const { return _items[_scp_suffix]; } 550 551 // Combine all the components into a single c-heap-allocated string; caller 552 // must free the string if/when no longer needed. 553 char* combined_path(); 554 555 private: 556 // Utility routines. 557 static char* add_to_path(const char* path, const char* str, bool prepend); 558 static char* add_jars_to_path(char* path, const char* directory); 559 560 inline void reset_item_at(int index); 561 562 // Array indices for the items that make up the sysclasspath. All except the 563 // base are allocated in the C heap and freed by this class. 564 enum { 565 _scp_prefix, // from -Xbootclasspath/p:... 566 _scp_base, // the default sysclasspath 567 _scp_suffix, // from -Xbootclasspath/a:... 568 _scp_nitems // the number of items, must be last. 569 }; 570 571 const char* _items[_scp_nitems]; 572 }; 573 574 SysClassPath::SysClassPath(const char* base) { 575 memset(_items, 0, sizeof(_items)); 576 _items[_scp_base] = base; 577 } 578 579 SysClassPath::~SysClassPath() { 580 // Free everything except the base. 581 for (int i = 0; i < _scp_nitems; ++i) { 582 if (i != _scp_base) reset_item_at(i); 583 } 584 } 585 586 inline void SysClassPath::set_base(const char* base) { 587 _items[_scp_base] = base; 588 } 589 590 inline void SysClassPath::add_prefix(const char* prefix) { 591 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 592 } 593 594 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 595 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 596 } 597 598 inline void SysClassPath::add_suffix(const char* suffix) { 599 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 600 } 601 602 inline void SysClassPath::reset_item_at(int index) { 603 assert(index < _scp_nitems && index != _scp_base, "just checking"); 604 if (_items[index] != NULL) { 605 FREE_C_HEAP_ARRAY(char, _items[index]); 606 _items[index] = NULL; 607 } 608 } 609 610 inline void SysClassPath::reset_path(const char* base) { 611 // Clear the prefix and suffix. 612 reset_item_at(_scp_prefix); 613 reset_item_at(_scp_suffix); 614 set_base(base); 615 } 616 617 //------------------------------------------------------------------------------ 618 619 620 // Combine the bootclasspath elements, some of which may be null, into a single 621 // c-heap-allocated string. 622 char* SysClassPath::combined_path() { 623 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 624 625 size_t lengths[_scp_nitems]; 626 size_t total_len = 0; 627 628 const char separator = *os::path_separator(); 629 630 // Get the lengths. 631 int i; 632 for (i = 0; i < _scp_nitems; ++i) { 633 if (_items[i] != NULL) { 634 lengths[i] = strlen(_items[i]); 635 // Include space for the separator char (or a NULL for the last item). 636 total_len += lengths[i] + 1; 637 } 638 } 639 assert(total_len > 0, "empty sysclasspath not allowed"); 640 641 // Copy the _items to a single string. 642 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 643 char* cp_tmp = cp; 644 for (i = 0; i < _scp_nitems; ++i) { 645 if (_items[i] != NULL) { 646 memcpy(cp_tmp, _items[i], lengths[i]); 647 cp_tmp += lengths[i]; 648 *cp_tmp++ = separator; 649 } 650 } 651 *--cp_tmp = '\0'; // Replace the extra separator. 652 return cp; 653 } 654 655 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 656 char* 657 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 658 char *cp; 659 660 assert(str != NULL, "just checking"); 661 if (path == NULL) { 662 size_t len = strlen(str) + 1; 663 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 664 memcpy(cp, str, len); // copy the trailing null 665 } else { 666 const char separator = *os::path_separator(); 667 size_t old_len = strlen(path); 668 size_t str_len = strlen(str); 669 size_t len = old_len + str_len + 2; 670 671 if (prepend) { 672 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 673 char* cp_tmp = cp; 674 memcpy(cp_tmp, str, str_len); 675 cp_tmp += str_len; 676 *cp_tmp = separator; 677 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 678 FREE_C_HEAP_ARRAY(char, path); 679 } else { 680 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 681 char* cp_tmp = cp + old_len; 682 *cp_tmp = separator; 683 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 684 } 685 } 686 return cp; 687 } 688 689 // Scan the directory and append any jar or zip files found to path. 690 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 691 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 692 DIR* dir = os::opendir(directory); 693 if (dir == NULL) return path; 694 695 char dir_sep[2] = { '\0', '\0' }; 696 size_t directory_len = strlen(directory); 697 const char fileSep = *os::file_separator(); 698 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 699 700 /* Scan the directory for jars/zips, appending them to path. */ 701 struct dirent *entry; 702 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 703 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 704 const char* name = entry->d_name; 705 const char* ext = name + strlen(name) - 4; 706 bool isJarOrZip = ext > name && 707 (os::file_name_strcmp(ext, ".jar") == 0 || 708 os::file_name_strcmp(ext, ".zip") == 0); 709 if (isJarOrZip) { 710 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 711 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 712 path = add_to_path(path, jarpath, false); 713 FREE_C_HEAP_ARRAY(char, jarpath); 714 } 715 } 716 FREE_C_HEAP_ARRAY(char, dbuf); 717 os::closedir(dir); 718 return path; 719 } 720 721 // Parses a memory size specification string. 722 static bool atomull(const char *s, julong* result) { 723 julong n = 0; 724 int args_read = 0; 725 bool is_hex = false; 726 // Skip leading 0[xX] for hexadecimal 727 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 728 s += 2; 729 is_hex = true; 730 args_read = sscanf(s, JULONG_FORMAT_X, &n); 731 } else { 732 args_read = sscanf(s, JULONG_FORMAT, &n); 733 } 734 if (args_read != 1) { 735 return false; 736 } 737 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 738 s++; 739 } 740 // 4705540: illegal if more characters are found after the first non-digit 741 if (strlen(s) > 1) { 742 return false; 743 } 744 switch (*s) { 745 case 'T': case 't': 746 *result = n * G * K; 747 // Check for overflow. 748 if (*result/((julong)G * K) != n) return false; 749 return true; 750 case 'G': case 'g': 751 *result = n * G; 752 if (*result/G != n) return false; 753 return true; 754 case 'M': case 'm': 755 *result = n * M; 756 if (*result/M != n) return false; 757 return true; 758 case 'K': case 'k': 759 *result = n * K; 760 if (*result/K != n) return false; 761 return true; 762 case '\0': 763 *result = n; 764 return true; 765 default: 766 return false; 767 } 768 } 769 770 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 771 if (size < min_size) return arg_too_small; 772 // Check that size will fit in a size_t (only relevant on 32-bit) 773 if (size > max_uintx) return arg_too_big; 774 return arg_in_range; 775 } 776 777 // Describe an argument out of range error 778 void Arguments::describe_range_error(ArgsRange errcode) { 779 switch(errcode) { 780 case arg_too_big: 781 jio_fprintf(defaultStream::error_stream(), 782 "The specified size exceeds the maximum " 783 "representable size.\n"); 784 break; 785 case arg_too_small: 786 case arg_unreadable: 787 case arg_in_range: 788 // do nothing for now 789 break; 790 default: 791 ShouldNotReachHere(); 792 } 793 } 794 795 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 796 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 797 return true; 798 } else { 799 return false; 800 } 801 } 802 803 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 804 char* end; 805 errno = 0; 806 double v = strtod(value, &end); 807 if ((errno != 0) || (*end != 0)) { 808 return false; 809 } 810 811 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 812 return true; 813 } 814 return false; 815 } 816 817 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 818 julong v; 819 int int_v; 820 intx intx_v; 821 bool is_neg = false; 822 Flag* result = Flag::find_flag(name, strlen(name)); 823 824 if (result == NULL) { 825 return false; 826 } 827 828 // Check the sign first since atomull() parses only unsigned values. 829 if (*value == '-') { 830 if (!result->is_intx() && !result->is_int()) { 831 return false; 832 } 833 value++; 834 is_neg = true; 835 } 836 if (!atomull(value, &v)) { 837 return false; 838 } 839 if (result->is_int()) { 840 int_v = (int) v; 841 if (is_neg) { 842 int_v = -int_v; 843 } 844 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 845 } else if (result->is_uint()) { 846 uint uint_v = (uint) v; 847 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 848 } else if (result->is_intx()) { 849 intx_v = (intx) v; 850 if (is_neg) { 851 intx_v = -intx_v; 852 } 853 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 854 } else if (result->is_uintx()) { 855 uintx uintx_v = (uintx) v; 856 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 857 } else if (result->is_uint64_t()) { 858 uint64_t uint64_t_v = (uint64_t) v; 859 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 860 } else if (result->is_size_t()) { 861 size_t size_t_v = (size_t) v; 862 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 863 } else { 864 return false; 865 } 866 } 867 868 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 869 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 870 // Contract: CommandLineFlags always returns a pointer that needs freeing. 871 FREE_C_HEAP_ARRAY(char, value); 872 return true; 873 } 874 875 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 876 const char* old_value = ""; 877 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 878 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 879 size_t new_len = strlen(new_value); 880 const char* value; 881 char* free_this_too = NULL; 882 if (old_len == 0) { 883 value = new_value; 884 } else if (new_len == 0) { 885 value = old_value; 886 } else { 887 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 888 // each new setting adds another LINE to the switch: 889 sprintf(buf, "%s\n%s", old_value, new_value); 890 value = buf; 891 free_this_too = buf; 892 } 893 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 894 // CommandLineFlags always returns a pointer that needs freeing. 895 FREE_C_HEAP_ARRAY(char, value); 896 if (free_this_too != NULL) { 897 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 898 FREE_C_HEAP_ARRAY(char, free_this_too); 899 } 900 return true; 901 } 902 903 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 904 const char* real_name = real_flag_name(arg); 905 JDK_Version since = JDK_Version(); 906 switch (is_deprecated_flag(arg, &since)) { 907 case -1: 908 return NULL; // obsolete or expired, don't process normally 909 case 0: 910 return real_name; 911 case 1: { 912 if (warn) { 913 char version[256]; 914 since.to_string(version, sizeof(version)); 915 if (real_name != arg) { 916 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 917 arg, version, real_name); 918 } else { 919 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 920 arg, version); 921 } 922 } 923 return real_name; 924 } 925 } 926 ShouldNotReachHere(); 927 return NULL; 928 } 929 930 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 931 932 // range of acceptable characters spelled out for portability reasons 933 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 934 #define BUFLEN 255 935 char name[BUFLEN+1]; 936 char dummy; 937 const char* real_name; 938 bool warn_if_deprecated = true; 939 940 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 941 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 942 if (real_name == NULL) { 943 return false; 944 } 945 return set_bool_flag(real_name, false, origin); 946 } 947 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 948 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 949 if (real_name == NULL) { 950 return false; 951 } 952 return set_bool_flag(real_name, true, origin); 953 } 954 955 char punct; 956 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 957 const char* value = strchr(arg, '=') + 1; 958 Flag* flag; 959 960 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 961 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 962 if (real_name == NULL) { 963 return false; 964 } 965 flag = Flag::find_flag(real_name); 966 if (flag != NULL && flag->is_ccstr()) { 967 if (flag->ccstr_accumulates()) { 968 return append_to_string_flag(real_name, value, origin); 969 } else { 970 if (value[0] == '\0') { 971 value = NULL; 972 } 973 return set_string_flag(real_name, value, origin); 974 } 975 } else { 976 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 977 } 978 } 979 980 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 981 const char* value = strchr(arg, '=') + 1; 982 // -XX:Foo:=xxx will reset the string flag to the given value. 983 if (value[0] == '\0') { 984 value = NULL; 985 } 986 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 987 if (real_name == NULL) { 988 return false; 989 } 990 return set_string_flag(real_name, value, origin); 991 } 992 993 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 994 #define SIGNED_NUMBER_RANGE "[-0123456789]" 995 #define NUMBER_RANGE "[0123456789eE+-]" 996 char value[BUFLEN + 1]; 997 char value2[BUFLEN + 1]; 998 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 999 // Looks like a floating-point number -- try again with more lenient format string 1000 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1001 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1002 if (real_name == NULL) { 1003 return false; 1004 } 1005 return set_fp_numeric_flag(real_name, value, origin); 1006 } 1007 } 1008 1009 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1010 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1011 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1012 if (real_name == NULL) { 1013 return false; 1014 } 1015 return set_numeric_flag(real_name, value, origin); 1016 } 1017 1018 return false; 1019 } 1020 1021 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1022 assert(bldarray != NULL, "illegal argument"); 1023 1024 if (arg == NULL) { 1025 return; 1026 } 1027 1028 int new_count = *count + 1; 1029 1030 // expand the array and add arg to the last element 1031 if (*bldarray == NULL) { 1032 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 1033 } else { 1034 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 1035 } 1036 (*bldarray)[*count] = os::strdup_check_oom(arg); 1037 *count = new_count; 1038 } 1039 1040 void Arguments::build_jvm_args(const char* arg) { 1041 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1042 } 1043 1044 void Arguments::build_jvm_flags(const char* arg) { 1045 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1046 } 1047 1048 // utility function to return a string that concatenates all 1049 // strings in a given char** array 1050 const char* Arguments::build_resource_string(char** args, int count) { 1051 if (args == NULL || count == 0) { 1052 return NULL; 1053 } 1054 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 1055 for (int i = 1; i < count; i++) { 1056 length += strlen(args[i]) + 1; // add 1 for a space 1057 } 1058 char* s = NEW_RESOURCE_ARRAY(char, length); 1059 strcpy(s, args[0]); 1060 for (int j = 1; j < count; j++) { 1061 strcat(s, " "); 1062 strcat(s, args[j]); 1063 } 1064 return (const char*) s; 1065 } 1066 1067 void Arguments::print_on(outputStream* st) { 1068 st->print_cr("VM Arguments:"); 1069 if (num_jvm_flags() > 0) { 1070 st->print("jvm_flags: "); print_jvm_flags_on(st); 1071 st->cr(); 1072 } 1073 if (num_jvm_args() > 0) { 1074 st->print("jvm_args: "); print_jvm_args_on(st); 1075 st->cr(); 1076 } 1077 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1078 if (_java_class_path != NULL) { 1079 char* path = _java_class_path->value(); 1080 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1081 } 1082 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1083 } 1084 1085 void Arguments::print_summary_on(outputStream* st) { 1086 // Print the command line. Environment variables that are helpful for 1087 // reproducing the problem are written later in the hs_err file. 1088 // flags are from setting file 1089 if (num_jvm_flags() > 0) { 1090 st->print_raw("Settings File: "); 1091 print_jvm_flags_on(st); 1092 st->cr(); 1093 } 1094 // args are the command line and environment variable arguments. 1095 st->print_raw("Command Line: "); 1096 if (num_jvm_args() > 0) { 1097 print_jvm_args_on(st); 1098 } 1099 // this is the classfile and any arguments to the java program 1100 if (java_command() != NULL) { 1101 st->print("%s", java_command()); 1102 } 1103 st->cr(); 1104 } 1105 1106 void Arguments::print_jvm_flags_on(outputStream* st) { 1107 if (_num_jvm_flags > 0) { 1108 for (int i=0; i < _num_jvm_flags; i++) { 1109 st->print("%s ", _jvm_flags_array[i]); 1110 } 1111 } 1112 } 1113 1114 void Arguments::print_jvm_args_on(outputStream* st) { 1115 if (_num_jvm_args > 0) { 1116 for (int i=0; i < _num_jvm_args; i++) { 1117 st->print("%s ", _jvm_args_array[i]); 1118 } 1119 } 1120 } 1121 1122 bool Arguments::process_argument(const char* arg, 1123 jboolean ignore_unrecognized, 1124 Flag::Flags origin) { 1125 JDK_Version since = JDK_Version(); 1126 1127 if (parse_argument(arg, origin)) { 1128 return true; 1129 } 1130 1131 // Determine if the flag has '+', '-', or '=' characters. 1132 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1133 const char* const argname = has_plus_minus ? arg + 1 : arg; 1134 1135 size_t arg_len; 1136 const char* equal_sign = strchr(argname, '='); 1137 if (equal_sign == NULL) { 1138 arg_len = strlen(argname); 1139 } else { 1140 arg_len = equal_sign - argname; 1141 } 1142 1143 // Only make the obsolete check for valid arguments. 1144 if (arg_len <= BUFLEN) { 1145 // Construct a string which consists only of the argument name without '+', '-', or '='. 1146 char stripped_argname[BUFLEN+1]; 1147 strncpy(stripped_argname, argname, arg_len); 1148 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate. 1149 1150 if (is_obsolete_flag(stripped_argname, &since)) { 1151 char version[256]; 1152 since.to_string(version, sizeof(version)); 1153 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1154 return true; 1155 } 1156 } 1157 1158 // For locked flags, report a custom error message if available. 1159 // Otherwise, report the standard unrecognized VM option. 1160 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1161 if (found_flag != NULL) { 1162 char locked_message_buf[BUFLEN]; 1163 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1164 if (strlen(locked_message_buf) == 0) { 1165 if (found_flag->is_bool() && !has_plus_minus) { 1166 jio_fprintf(defaultStream::error_stream(), 1167 "Missing +/- setting for VM option '%s'\n", argname); 1168 } else if (!found_flag->is_bool() && has_plus_minus) { 1169 jio_fprintf(defaultStream::error_stream(), 1170 "Unexpected +/- setting in VM option '%s'\n", argname); 1171 } else { 1172 jio_fprintf(defaultStream::error_stream(), 1173 "Improperly specified VM option '%s'\n", argname); 1174 } 1175 } else { 1176 #ifdef PRODUCT 1177 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1178 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1179 if (ignore_unrecognized && mismatched) { 1180 return true; 1181 } 1182 #endif 1183 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1184 } 1185 } else { 1186 if (ignore_unrecognized) { 1187 return true; 1188 } 1189 jio_fprintf(defaultStream::error_stream(), 1190 "Unrecognized VM option '%s'\n", argname); 1191 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1192 if (fuzzy_matched != NULL) { 1193 jio_fprintf(defaultStream::error_stream(), 1194 "Did you mean '%s%s%s'? ", 1195 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1196 fuzzy_matched->_name, 1197 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1198 } 1199 } 1200 1201 // allow for commandline "commenting out" options like -XX:#+Verbose 1202 return arg[0] == '#'; 1203 } 1204 1205 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1206 FILE* stream = fopen(file_name, "rb"); 1207 if (stream == NULL) { 1208 if (should_exist) { 1209 jio_fprintf(defaultStream::error_stream(), 1210 "Could not open settings file %s\n", file_name); 1211 return false; 1212 } else { 1213 return true; 1214 } 1215 } 1216 1217 char token[1024]; 1218 int pos = 0; 1219 1220 bool in_white_space = true; 1221 bool in_comment = false; 1222 bool in_quote = false; 1223 char quote_c = 0; 1224 bool result = true; 1225 1226 int c = getc(stream); 1227 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1228 if (in_white_space) { 1229 if (in_comment) { 1230 if (c == '\n') in_comment = false; 1231 } else { 1232 if (c == '#') in_comment = true; 1233 else if (!isspace(c)) { 1234 in_white_space = false; 1235 token[pos++] = c; 1236 } 1237 } 1238 } else { 1239 if (c == '\n' || (!in_quote && isspace(c))) { 1240 // token ends at newline, or at unquoted whitespace 1241 // this allows a way to include spaces in string-valued options 1242 token[pos] = '\0'; 1243 logOption(token); 1244 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1245 build_jvm_flags(token); 1246 pos = 0; 1247 in_white_space = true; 1248 in_quote = false; 1249 } else if (!in_quote && (c == '\'' || c == '"')) { 1250 in_quote = true; 1251 quote_c = c; 1252 } else if (in_quote && (c == quote_c)) { 1253 in_quote = false; 1254 } else { 1255 token[pos++] = c; 1256 } 1257 } 1258 c = getc(stream); 1259 } 1260 if (pos > 0) { 1261 token[pos] = '\0'; 1262 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1263 build_jvm_flags(token); 1264 } 1265 fclose(stream); 1266 return result; 1267 } 1268 1269 //============================================================================================================= 1270 // Parsing of properties (-D) 1271 1272 const char* Arguments::get_property(const char* key) { 1273 return PropertyList_get_value(system_properties(), key); 1274 } 1275 1276 bool Arguments::add_property(const char* prop) { 1277 const char* eq = strchr(prop, '='); 1278 const char* key; 1279 const char* value = ""; 1280 1281 if (eq == NULL) { 1282 // property doesn't have a value, thus use passed string 1283 key = prop; 1284 } else { 1285 // property have a value, thus extract it and save to the 1286 // allocated string 1287 size_t key_len = eq - prop; 1288 char* tmp_key = AllocateHeap(key_len + 1, mtInternal); 1289 1290 strncpy(tmp_key, prop, key_len); 1291 tmp_key[key_len] = '\0'; 1292 key = tmp_key; 1293 1294 value = &prop[key_len + 1]; 1295 } 1296 1297 if (strcmp(key, "java.compiler") == 0) { 1298 process_java_compiler_argument(value); 1299 // Record value in Arguments, but let it get passed to Java. 1300 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1301 strcmp(key, "sun.java.launcher.pid") == 0) { 1302 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1303 // private and are processed in process_sun_java_launcher_properties(); 1304 // the sun.java.launcher property is passed on to the java application 1305 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1306 PropertyList_unique_add(&_system_properties, key, value, true); 1307 } else { 1308 if (strcmp(key, "sun.java.command") == 0) { 1309 if (_java_command != NULL) { 1310 os::free(_java_command); 1311 } 1312 _java_command = os::strdup_check_oom(value, mtInternal); 1313 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1314 if (_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1315 assert(_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1316 os::free((void *)_java_vendor_url_bug); 1317 } 1318 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1319 // its value without going through the property list or making a Java call. 1320 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal); 1321 } 1322 1323 // Create new property and add at the end of the list 1324 PropertyList_unique_add(&_system_properties, key, value); 1325 } 1326 1327 if (key != prop) { 1328 // SystemProperty copy passed value, thus free previously allocated 1329 // memory 1330 FreeHeap((void *)key); 1331 } 1332 1333 return true; 1334 } 1335 1336 //=========================================================================================================== 1337 // Setting int/mixed/comp mode flags 1338 1339 void Arguments::set_mode_flags(Mode mode) { 1340 // Set up default values for all flags. 1341 // If you add a flag to any of the branches below, 1342 // add a default value for it here. 1343 set_java_compiler(false); 1344 _mode = mode; 1345 1346 // Ensure Agent_OnLoad has the correct initial values. 1347 // This may not be the final mode; mode may change later in onload phase. 1348 PropertyList_unique_add(&_system_properties, "java.vm.info", 1349 VM_Version::vm_info_string(), false); 1350 1351 UseInterpreter = true; 1352 UseCompiler = true; 1353 UseLoopCounter = true; 1354 1355 // Default values may be platform/compiler dependent - 1356 // use the saved values 1357 ClipInlining = Arguments::_ClipInlining; 1358 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1359 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1360 BackgroundCompilation = Arguments::_BackgroundCompilation; 1361 if (TieredCompilation) { 1362 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1363 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1364 } 1365 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1366 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1367 } 1368 } 1369 1370 // Change from defaults based on mode 1371 switch (mode) { 1372 default: 1373 ShouldNotReachHere(); 1374 break; 1375 case _int: 1376 UseCompiler = false; 1377 UseLoopCounter = false; 1378 AlwaysCompileLoopMethods = false; 1379 UseOnStackReplacement = false; 1380 break; 1381 case _mixed: 1382 // same as default 1383 break; 1384 case _comp: 1385 UseInterpreter = false; 1386 BackgroundCompilation = false; 1387 ClipInlining = false; 1388 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1389 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1390 // compile a level 4 (C2) and then continue executing it. 1391 if (TieredCompilation) { 1392 Tier3InvokeNotifyFreqLog = 0; 1393 Tier4InvocationThreshold = 0; 1394 } 1395 break; 1396 } 1397 } 1398 1399 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS 1400 // Conflict: required to use shared spaces (-Xshare:on), but 1401 // incompatible command line options were chosen. 1402 1403 static void no_shared_spaces(const char* message) { 1404 if (RequireSharedSpaces) { 1405 jio_fprintf(defaultStream::error_stream(), 1406 "Class data sharing is inconsistent with other specified options.\n"); 1407 vm_exit_during_initialization("Unable to use shared archive.", message); 1408 } else { 1409 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1410 } 1411 } 1412 #endif 1413 1414 // Returns threshold scaled with the value of scale. 1415 // If scale < 0.0, threshold is returned without scaling. 1416 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1417 if (scale == 1.0 || scale < 0.0) { 1418 return threshold; 1419 } else { 1420 return (intx)(threshold * scale); 1421 } 1422 } 1423 1424 // Returns freq_log scaled with the value of scale. 1425 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1426 // If scale < 0.0, freq_log is returned without scaling. 1427 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1428 // Check if scaling is necessary or if negative value was specified. 1429 if (scale == 1.0 || scale < 0.0) { 1430 return freq_log; 1431 } 1432 // Check values to avoid calculating log2 of 0. 1433 if (scale == 0.0 || freq_log == 0) { 1434 return 0; 1435 } 1436 // Determine the maximum notification frequency value currently supported. 1437 // The largest mask value that the interpreter/C1 can handle is 1438 // of length InvocationCounter::number_of_count_bits. Mask values are always 1439 // one bit shorter then the value of the notification frequency. Set 1440 // max_freq_bits accordingly. 1441 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1442 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1443 if (scaled_freq == 0) { 1444 // Return 0 right away to avoid calculating log2 of 0. 1445 return 0; 1446 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1447 return max_freq_bits; 1448 } else { 1449 return log2_intptr(scaled_freq); 1450 } 1451 } 1452 1453 void Arguments::set_tiered_flags() { 1454 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1455 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1456 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1457 } 1458 if (CompilationPolicyChoice < 2) { 1459 vm_exit_during_initialization( 1460 "Incompatible compilation policy selected", NULL); 1461 } 1462 // Increase the code cache size - tiered compiles a lot more. 1463 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1464 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1465 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1466 } 1467 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1468 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1469 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1470 1471 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1472 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1473 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1474 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1475 } 1476 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1477 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1478 } 1479 // Check consistency of code heap sizes 1480 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1481 jio_fprintf(defaultStream::error_stream(), 1482 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1483 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1484 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1485 vm_exit(1); 1486 } 1487 } 1488 } 1489 if (!UseInterpreter) { // -Xcomp 1490 Tier3InvokeNotifyFreqLog = 0; 1491 Tier4InvocationThreshold = 0; 1492 } 1493 1494 if (CompileThresholdScaling < 0) { 1495 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1496 } 1497 1498 // Scale tiered compilation thresholds. 1499 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1500 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1501 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1502 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1503 1504 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1505 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1506 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1507 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1508 1509 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1510 // once these thresholds become supported. 1511 1512 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1513 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1514 1515 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1516 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1517 1518 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1519 1520 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1521 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1522 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1523 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1524 } 1525 } 1526 1527 #if INCLUDE_ALL_GCS 1528 static void disable_adaptive_size_policy(const char* collector_name) { 1529 if (UseAdaptiveSizePolicy) { 1530 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1531 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1532 collector_name); 1533 } 1534 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1535 } 1536 } 1537 1538 void Arguments::set_parnew_gc_flags() { 1539 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1540 "control point invariant"); 1541 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1542 assert(UseParNewGC, "ParNew should always be used with CMS"); 1543 1544 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1545 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1546 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1547 } else if (ParallelGCThreads == 0) { 1548 jio_fprintf(defaultStream::error_stream(), 1549 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1550 vm_exit(1); 1551 } 1552 1553 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1554 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1555 // we set them to 1024 and 1024. 1556 // See CR 6362902. 1557 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1558 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1559 } 1560 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1561 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1562 } 1563 1564 // When using compressed oops, we use local overflow stacks, 1565 // rather than using a global overflow list chained through 1566 // the klass word of the object's pre-image. 1567 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1568 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1569 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1570 } 1571 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1572 } 1573 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1574 } 1575 1576 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1577 // sparc/solaris for certain applications, but would gain from 1578 // further optimization and tuning efforts, and would almost 1579 // certainly gain from analysis of platform and environment. 1580 void Arguments::set_cms_and_parnew_gc_flags() { 1581 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1582 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1583 assert(UseParNewGC, "ParNew should always be used with CMS"); 1584 1585 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1586 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1587 1588 set_parnew_gc_flags(); 1589 1590 size_t max_heap = align_size_down(MaxHeapSize, 1591 CardTableRS::ct_max_alignment_constraint()); 1592 1593 // Now make adjustments for CMS 1594 intx tenuring_default = (intx)6; 1595 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1596 1597 // Preferred young gen size for "short" pauses: 1598 // upper bound depends on # of threads and NewRatio. 1599 const size_t preferred_max_new_size_unaligned = 1600 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1601 size_t preferred_max_new_size = 1602 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1603 1604 // Unless explicitly requested otherwise, size young gen 1605 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1606 1607 // If either MaxNewSize or NewRatio is set on the command line, 1608 // assume the user is trying to set the size of the young gen. 1609 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1610 1611 // Set MaxNewSize to our calculated preferred_max_new_size unless 1612 // NewSize was set on the command line and it is larger than 1613 // preferred_max_new_size. 1614 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1615 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1616 } else { 1617 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1618 } 1619 log_trace(gc, init)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1620 1621 // Code along this path potentially sets NewSize and OldSize 1622 log_trace(gc, init)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1623 min_heap_size(), InitialHeapSize, max_heap); 1624 size_t min_new = preferred_max_new_size; 1625 if (FLAG_IS_CMDLINE(NewSize)) { 1626 min_new = NewSize; 1627 } 1628 if (max_heap > min_new && min_heap_size() > min_new) { 1629 // Unless explicitly requested otherwise, make young gen 1630 // at least min_new, and at most preferred_max_new_size. 1631 if (FLAG_IS_DEFAULT(NewSize)) { 1632 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1633 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1634 log_trace(gc, init)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1635 } 1636 // Unless explicitly requested otherwise, size old gen 1637 // so it's NewRatio x of NewSize. 1638 if (FLAG_IS_DEFAULT(OldSize)) { 1639 if (max_heap > NewSize) { 1640 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1641 log_trace(gc, init)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1642 } 1643 } 1644 } 1645 } 1646 // Unless explicitly requested otherwise, definitely 1647 // promote all objects surviving "tenuring_default" scavenges. 1648 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1649 FLAG_IS_DEFAULT(SurvivorRatio)) { 1650 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1651 } 1652 // If we decided above (or user explicitly requested) 1653 // `promote all' (via MaxTenuringThreshold := 0), 1654 // prefer minuscule survivor spaces so as not to waste 1655 // space for (non-existent) survivors 1656 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1657 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1658 } 1659 1660 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1661 // but rather the number of free blocks of a given size that are used when 1662 // replenishing the local per-worker free list caches. 1663 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1664 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1665 // OldPLAB sizing manually turned off: Use a larger default setting, 1666 // unless it was manually specified. This is because a too-low value 1667 // will slow down scavenges. 1668 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1669 } else { 1670 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1671 } 1672 } 1673 1674 // If either of the static initialization defaults have changed, note this 1675 // modification. 1676 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1677 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1678 } 1679 1680 if (!ClassUnloading) { 1681 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1682 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1683 } 1684 1685 log_trace(gc, init)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1686 log_trace(gc, init)("ConcGCThreads: %u", ConcGCThreads); 1687 } 1688 #endif // INCLUDE_ALL_GCS 1689 1690 void set_object_alignment() { 1691 // Object alignment. 1692 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1693 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1694 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1695 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1696 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1697 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1698 1699 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1700 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1701 1702 // Oop encoding heap max 1703 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1704 1705 if (SurvivorAlignmentInBytes == 0) { 1706 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1707 } 1708 1709 #if INCLUDE_ALL_GCS 1710 // Set CMS global values 1711 CompactibleFreeListSpace::set_cms_values(); 1712 #endif // INCLUDE_ALL_GCS 1713 } 1714 1715 size_t Arguments::max_heap_for_compressed_oops() { 1716 // Avoid sign flip. 1717 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1718 // We need to fit both the NULL page and the heap into the memory budget, while 1719 // keeping alignment constraints of the heap. To guarantee the latter, as the 1720 // NULL page is located before the heap, we pad the NULL page to the conservative 1721 // maximum alignment that the GC may ever impose upon the heap. 1722 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1723 _conservative_max_heap_alignment); 1724 1725 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1726 NOT_LP64(ShouldNotReachHere(); return 0); 1727 } 1728 1729 bool Arguments::should_auto_select_low_pause_collector() { 1730 if (UseAutoGCSelectPolicy && 1731 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1732 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1733 log_trace(gc, init)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1734 return true; 1735 } 1736 return false; 1737 } 1738 1739 void Arguments::set_use_compressed_oops() { 1740 #ifndef ZERO 1741 #ifdef _LP64 1742 // MaxHeapSize is not set up properly at this point, but 1743 // the only value that can override MaxHeapSize if we are 1744 // to use UseCompressedOops is InitialHeapSize. 1745 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1746 1747 if (max_heap_size <= max_heap_for_compressed_oops()) { 1748 #if !defined(COMPILER1) || defined(TIERED) 1749 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1750 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1751 } 1752 #endif 1753 } else { 1754 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1755 warning("Max heap size too large for Compressed Oops"); 1756 FLAG_SET_DEFAULT(UseCompressedOops, false); 1757 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1758 } 1759 } 1760 #endif // _LP64 1761 #endif // ZERO 1762 } 1763 1764 1765 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1766 // set_use_compressed_oops(). 1767 void Arguments::set_use_compressed_klass_ptrs() { 1768 #ifndef ZERO 1769 #ifdef _LP64 1770 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1771 if (!UseCompressedOops) { 1772 if (UseCompressedClassPointers) { 1773 warning("UseCompressedClassPointers requires UseCompressedOops"); 1774 } 1775 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1776 } else { 1777 // Turn on UseCompressedClassPointers too 1778 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1779 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1780 } 1781 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1782 if (UseCompressedClassPointers) { 1783 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1784 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1785 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1786 } 1787 } 1788 } 1789 #endif // _LP64 1790 #endif // !ZERO 1791 } 1792 1793 void Arguments::set_conservative_max_heap_alignment() { 1794 // The conservative maximum required alignment for the heap is the maximum of 1795 // the alignments imposed by several sources: any requirements from the heap 1796 // itself, the collector policy and the maximum page size we may run the VM 1797 // with. 1798 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1799 #if INCLUDE_ALL_GCS 1800 if (UseParallelGC) { 1801 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1802 } else if (UseG1GC) { 1803 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1804 } 1805 #endif // INCLUDE_ALL_GCS 1806 _conservative_max_heap_alignment = MAX4(heap_alignment, 1807 (size_t)os::vm_allocation_granularity(), 1808 os::max_page_size(), 1809 CollectorPolicy::compute_heap_alignment()); 1810 } 1811 1812 void Arguments::select_gc_ergonomically() { 1813 if (os::is_server_class_machine()) { 1814 if (should_auto_select_low_pause_collector()) { 1815 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1816 } else { 1817 #if defined(JAVASE_EMBEDDED) 1818 FLAG_SET_ERGO(bool, UseParallelGC, true); 1819 #else 1820 FLAG_SET_ERGO(bool, UseG1GC, true); 1821 #endif 1822 } 1823 } else { 1824 FLAG_SET_ERGO(bool, UseSerialGC, true); 1825 } 1826 } 1827 1828 void Arguments::select_gc() { 1829 if (!gc_selected()) { 1830 select_gc_ergonomically(); 1831 guarantee(gc_selected(), "No GC selected"); 1832 } 1833 } 1834 1835 void Arguments::set_ergonomics_flags() { 1836 select_gc(); 1837 1838 #if defined(COMPILER2) || INCLUDE_JVMCI 1839 // Shared spaces work fine with other GCs but causes bytecode rewriting 1840 // to be disabled, which hurts interpreter performance and decreases 1841 // server performance. When -server is specified, keep the default off 1842 // unless it is asked for. Future work: either add bytecode rewriting 1843 // at link time, or rewrite bytecodes in non-shared methods. 1844 if (!DumpSharedSpaces && !RequireSharedSpaces && 1845 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1846 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1847 } 1848 #endif 1849 1850 set_conservative_max_heap_alignment(); 1851 1852 #ifndef ZERO 1853 #ifdef _LP64 1854 set_use_compressed_oops(); 1855 1856 // set_use_compressed_klass_ptrs() must be called after calling 1857 // set_use_compressed_oops(). 1858 set_use_compressed_klass_ptrs(); 1859 1860 // Also checks that certain machines are slower with compressed oops 1861 // in vm_version initialization code. 1862 #endif // _LP64 1863 #endif // !ZERO 1864 1865 CodeCacheExtensions::set_ergonomics_flags(); 1866 } 1867 1868 void Arguments::set_parallel_gc_flags() { 1869 assert(UseParallelGC || UseParallelOldGC, "Error"); 1870 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1871 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1872 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1873 } 1874 FLAG_SET_DEFAULT(UseParallelGC, true); 1875 1876 // If no heap maximum was requested explicitly, use some reasonable fraction 1877 // of the physical memory, up to a maximum of 1GB. 1878 FLAG_SET_DEFAULT(ParallelGCThreads, 1879 Abstract_VM_Version::parallel_worker_threads()); 1880 if (ParallelGCThreads == 0) { 1881 jio_fprintf(defaultStream::error_stream(), 1882 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1883 vm_exit(1); 1884 } 1885 1886 if (UseAdaptiveSizePolicy) { 1887 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1888 // unless the user actually sets these flags. 1889 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1890 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1891 } 1892 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1893 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1894 } 1895 } 1896 1897 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1898 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1899 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1900 // See CR 6362902 for details. 1901 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1902 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1903 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1904 } 1905 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1906 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1907 } 1908 } 1909 1910 if (UseParallelOldGC) { 1911 // Par compact uses lower default values since they are treated as 1912 // minimums. These are different defaults because of the different 1913 // interpretation and are not ergonomically set. 1914 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1915 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1916 } 1917 } 1918 } 1919 1920 void Arguments::set_g1_gc_flags() { 1921 assert(UseG1GC, "Error"); 1922 #if defined(COMPILER1) || INCLUDE_JVMCI 1923 FastTLABRefill = false; 1924 #endif 1925 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1926 if (ParallelGCThreads == 0) { 1927 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1928 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1929 } 1930 1931 #if INCLUDE_ALL_GCS 1932 if (G1ConcRefinementThreads == 0) { 1933 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1934 } 1935 #endif 1936 1937 // MarkStackSize will be set (if it hasn't been set by the user) 1938 // when concurrent marking is initialized. 1939 // Its value will be based upon the number of parallel marking threads. 1940 // But we do set the maximum mark stack size here. 1941 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1942 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1943 } 1944 1945 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1946 // In G1, we want the default GC overhead goal to be higher than 1947 // say in PS. So we set it here to 10%. Otherwise the heap might 1948 // be expanded more aggressively than we would like it to. In 1949 // fact, even 10% seems to not be high enough in some cases 1950 // (especially small GC stress tests that the main thing they do 1951 // is allocation). We might consider increase it further. 1952 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1953 } 1954 1955 if (PrintGCDetails && Verbose) { 1956 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1957 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1958 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1959 } 1960 } 1961 1962 #if !INCLUDE_ALL_GCS 1963 #ifdef ASSERT 1964 static bool verify_serial_gc_flags() { 1965 return (UseSerialGC && 1966 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1967 UseParallelGC || UseParallelOldGC)); 1968 } 1969 #endif // ASSERT 1970 #endif // INCLUDE_ALL_GCS 1971 1972 void Arguments::set_gc_specific_flags() { 1973 #if INCLUDE_ALL_GCS 1974 // Set per-collector flags 1975 if (UseParallelGC || UseParallelOldGC) { 1976 set_parallel_gc_flags(); 1977 } else if (UseConcMarkSweepGC) { 1978 set_cms_and_parnew_gc_flags(); 1979 } else if (UseG1GC) { 1980 set_g1_gc_flags(); 1981 } 1982 if (AssumeMP && !UseSerialGC) { 1983 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1984 warning("If the number of processors is expected to increase from one, then" 1985 " you should configure the number of parallel GC threads appropriately" 1986 " using -XX:ParallelGCThreads=N"); 1987 } 1988 } 1989 if (MinHeapFreeRatio == 100) { 1990 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1991 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1992 } 1993 #else // INCLUDE_ALL_GCS 1994 assert(verify_serial_gc_flags(), "SerialGC unset"); 1995 #endif // INCLUDE_ALL_GCS 1996 } 1997 1998 julong Arguments::limit_by_allocatable_memory(julong limit) { 1999 julong max_allocatable; 2000 julong result = limit; 2001 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2002 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2003 } 2004 return result; 2005 } 2006 2007 // Use static initialization to get the default before parsing 2008 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2009 2010 void Arguments::set_heap_size() { 2011 const julong phys_mem = 2012 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2013 : (julong)MaxRAM; 2014 2015 // If the maximum heap size has not been set with -Xmx, 2016 // then set it as fraction of the size of physical memory, 2017 // respecting the maximum and minimum sizes of the heap. 2018 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2019 julong reasonable_max = phys_mem / MaxRAMFraction; 2020 2021 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2022 // Small physical memory, so use a minimum fraction of it for the heap 2023 reasonable_max = phys_mem / MinRAMFraction; 2024 } else { 2025 // Not-small physical memory, so require a heap at least 2026 // as large as MaxHeapSize 2027 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2028 } 2029 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2030 // Limit the heap size to ErgoHeapSizeLimit 2031 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2032 } 2033 if (UseCompressedOops) { 2034 // Limit the heap size to the maximum possible when using compressed oops 2035 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2036 2037 // HeapBaseMinAddress can be greater than default but not less than. 2038 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2039 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2040 // matches compressed oops printing flags 2041 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 2042 jio_fprintf(defaultStream::error_stream(), 2043 "HeapBaseMinAddress must be at least " SIZE_FORMAT 2044 " (" SIZE_FORMAT "G) which is greater than value given " 2045 SIZE_FORMAT "\n", 2046 DefaultHeapBaseMinAddress, 2047 DefaultHeapBaseMinAddress/G, 2048 HeapBaseMinAddress); 2049 } 2050 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2051 } 2052 } 2053 2054 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2055 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2056 // but it should be not less than default MaxHeapSize. 2057 max_coop_heap -= HeapBaseMinAddress; 2058 } 2059 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2060 } 2061 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2062 2063 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2064 // An initial heap size was specified on the command line, 2065 // so be sure that the maximum size is consistent. Done 2066 // after call to limit_by_allocatable_memory because that 2067 // method might reduce the allocation size. 2068 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2069 } 2070 2071 log_trace(gc, init)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2072 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2073 } 2074 2075 // If the minimum or initial heap_size have not been set or requested to be set 2076 // ergonomically, set them accordingly. 2077 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2078 julong reasonable_minimum = (julong)(OldSize + NewSize); 2079 2080 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2081 2082 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2083 2084 if (InitialHeapSize == 0) { 2085 julong reasonable_initial = phys_mem / InitialRAMFraction; 2086 2087 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2088 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2089 2090 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2091 2092 log_trace(gc, init)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2093 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2094 } 2095 // If the minimum heap size has not been set (via -Xms), 2096 // synchronize with InitialHeapSize to avoid errors with the default value. 2097 if (min_heap_size() == 0) { 2098 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2099 log_trace(gc, init)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2100 } 2101 } 2102 } 2103 2104 // This option inspects the machine and attempts to set various 2105 // parameters to be optimal for long-running, memory allocation 2106 // intensive jobs. It is intended for machines with large 2107 // amounts of cpu and memory. 2108 jint Arguments::set_aggressive_heap_flags() { 2109 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2110 // VM, but we may not be able to represent the total physical memory 2111 // available (like having 8gb of memory on a box but using a 32bit VM). 2112 // Thus, we need to make sure we're using a julong for intermediate 2113 // calculations. 2114 julong initHeapSize; 2115 julong total_memory = os::physical_memory(); 2116 2117 if (total_memory < (julong) 256 * M) { 2118 jio_fprintf(defaultStream::error_stream(), 2119 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2120 vm_exit(1); 2121 } 2122 2123 // The heap size is half of available memory, or (at most) 2124 // all of possible memory less 160mb (leaving room for the OS 2125 // when using ISM). This is the maximum; because adaptive sizing 2126 // is turned on below, the actual space used may be smaller. 2127 2128 initHeapSize = MIN2(total_memory / (julong) 2, 2129 total_memory - (julong) 160 * M); 2130 2131 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2132 2133 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2134 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2135 return JNI_EINVAL; 2136 } 2137 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2138 return JNI_EINVAL; 2139 } 2140 // Currently the minimum size and the initial heap sizes are the same. 2141 set_min_heap_size(initHeapSize); 2142 } 2143 if (FLAG_IS_DEFAULT(NewSize)) { 2144 // Make the young generation 3/8ths of the total heap. 2145 if (FLAG_SET_CMDLINE(size_t, NewSize, 2146 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2147 return JNI_EINVAL; 2148 } 2149 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2150 return JNI_EINVAL; 2151 } 2152 } 2153 2154 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2155 FLAG_SET_DEFAULT(UseLargePages, true); 2156 #endif 2157 2158 // Increase some data structure sizes for efficiency 2159 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2160 return JNI_EINVAL; 2161 } 2162 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2163 return JNI_EINVAL; 2164 } 2165 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2166 return JNI_EINVAL; 2167 } 2168 2169 // See the OldPLABSize comment below, but replace 'after promotion' 2170 // with 'after copying'. YoungPLABSize is the size of the survivor 2171 // space per-gc-thread buffers. The default is 4kw. 2172 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2173 return JNI_EINVAL; 2174 } 2175 2176 // OldPLABSize is the size of the buffers in the old gen that 2177 // UseParallelGC uses to promote live data that doesn't fit in the 2178 // survivor spaces. At any given time, there's one for each gc thread. 2179 // The default size is 1kw. These buffers are rarely used, since the 2180 // survivor spaces are usually big enough. For specjbb, however, there 2181 // are occasions when there's lots of live data in the young gen 2182 // and we end up promoting some of it. We don't have a definite 2183 // explanation for why bumping OldPLABSize helps, but the theory 2184 // is that a bigger PLAB results in retaining something like the 2185 // original allocation order after promotion, which improves mutator 2186 // locality. A minor effect may be that larger PLABs reduce the 2187 // number of PLAB allocation events during gc. The value of 8kw 2188 // was arrived at by experimenting with specjbb. 2189 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2190 return JNI_EINVAL; 2191 } 2192 2193 // Enable parallel GC and adaptive generation sizing 2194 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2195 return JNI_EINVAL; 2196 } 2197 FLAG_SET_DEFAULT(ParallelGCThreads, 2198 Abstract_VM_Version::parallel_worker_threads()); 2199 2200 // Encourage steady state memory management 2201 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2202 return JNI_EINVAL; 2203 } 2204 2205 // This appears to improve mutator locality 2206 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2207 return JNI_EINVAL; 2208 } 2209 2210 // Get around early Solaris scheduling bug 2211 // (affinity vs other jobs on system) 2212 // but disallow DR and offlining (5008695). 2213 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2214 return JNI_EINVAL; 2215 } 2216 2217 return JNI_OK; 2218 } 2219 2220 // This must be called after ergonomics. 2221 void Arguments::set_bytecode_flags() { 2222 if (!RewriteBytecodes) { 2223 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2224 } 2225 } 2226 2227 // Aggressive optimization flags -XX:+AggressiveOpts 2228 jint Arguments::set_aggressive_opts_flags() { 2229 #ifdef COMPILER2 2230 if (AggressiveUnboxing) { 2231 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2232 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2233 } else if (!EliminateAutoBox) { 2234 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2235 AggressiveUnboxing = false; 2236 } 2237 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2238 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2239 } else if (!DoEscapeAnalysis) { 2240 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2241 AggressiveUnboxing = false; 2242 } 2243 } 2244 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2245 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2246 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2247 } 2248 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2249 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2250 } 2251 2252 // Feed the cache size setting into the JDK 2253 char buffer[1024]; 2254 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2255 if (!add_property(buffer)) { 2256 return JNI_ENOMEM; 2257 } 2258 } 2259 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2260 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2261 } 2262 #endif 2263 2264 if (AggressiveOpts) { 2265 // Sample flag setting code 2266 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2267 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2268 // } 2269 } 2270 2271 return JNI_OK; 2272 } 2273 2274 //=========================================================================================================== 2275 // Parsing of java.compiler property 2276 2277 void Arguments::process_java_compiler_argument(const char* arg) { 2278 // For backwards compatibility, Djava.compiler=NONE or "" 2279 // causes us to switch to -Xint mode UNLESS -Xdebug 2280 // is also specified. 2281 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2282 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2283 } 2284 } 2285 2286 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2287 _sun_java_launcher = os::strdup_check_oom(launcher); 2288 } 2289 2290 bool Arguments::created_by_java_launcher() { 2291 assert(_sun_java_launcher != NULL, "property must have value"); 2292 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2293 } 2294 2295 bool Arguments::sun_java_launcher_is_altjvm() { 2296 return _sun_java_launcher_is_altjvm; 2297 } 2298 2299 //=========================================================================================================== 2300 // Parsing of main arguments 2301 2302 // check if do gclog rotation 2303 // +UseGCLogFileRotation is a must, 2304 // no gc log rotation when log file not supplied or 2305 // NumberOfGCLogFiles is 0 2306 void check_gclog_consistency() { 2307 if (UseGCLogFileRotation) { 2308 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2309 jio_fprintf(defaultStream::output_stream(), 2310 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2311 "where num_of_file > 0\n" 2312 "GC log rotation is turned off\n"); 2313 UseGCLogFileRotation = false; 2314 } 2315 } 2316 2317 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2318 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) { 2319 jio_fprintf(defaultStream::output_stream(), 2320 "GCLogFileSize changed to minimum 8K\n"); 2321 } 2322 } 2323 } 2324 2325 // This function is called for -Xloggc:<filename>, it can be used 2326 // to check if a given file name(or string) conforms to the following 2327 // specification: 2328 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2329 // %p and %t only allowed once. We only limit usage of filename not path 2330 bool is_filename_valid(const char *file_name) { 2331 const char* p = file_name; 2332 char file_sep = os::file_separator()[0]; 2333 const char* cp; 2334 // skip prefix path 2335 for (cp = file_name; *cp != '\0'; cp++) { 2336 if (*cp == '/' || *cp == file_sep) { 2337 p = cp + 1; 2338 } 2339 } 2340 2341 int count_p = 0; 2342 int count_t = 0; 2343 while (*p != '\0') { 2344 if ((*p >= '0' && *p <= '9') || 2345 (*p >= 'A' && *p <= 'Z') || 2346 (*p >= 'a' && *p <= 'z') || 2347 *p == '-' || 2348 *p == '_' || 2349 *p == '.') { 2350 p++; 2351 continue; 2352 } 2353 if (*p == '%') { 2354 if(*(p + 1) == 'p') { 2355 p += 2; 2356 count_p ++; 2357 continue; 2358 } 2359 if (*(p + 1) == 't') { 2360 p += 2; 2361 count_t ++; 2362 continue; 2363 } 2364 } 2365 return false; 2366 } 2367 return count_p < 2 && count_t < 2; 2368 } 2369 2370 // Check consistency of GC selection 2371 bool Arguments::check_gc_consistency() { 2372 check_gclog_consistency(); 2373 // Ensure that the user has not selected conflicting sets 2374 // of collectors. 2375 uint i = 0; 2376 if (UseSerialGC) i++; 2377 if (UseConcMarkSweepGC) i++; 2378 if (UseParallelGC || UseParallelOldGC) i++; 2379 if (UseG1GC) i++; 2380 if (i > 1) { 2381 jio_fprintf(defaultStream::error_stream(), 2382 "Conflicting collector combinations in option list; " 2383 "please refer to the release notes for the combinations " 2384 "allowed\n"); 2385 return false; 2386 } 2387 2388 if (UseConcMarkSweepGC && !UseParNewGC) { 2389 jio_fprintf(defaultStream::error_stream(), 2390 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2391 return false; 2392 } 2393 2394 if (UseParNewGC && !UseConcMarkSweepGC) { 2395 jio_fprintf(defaultStream::error_stream(), 2396 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2397 return false; 2398 } 2399 2400 return true; 2401 } 2402 2403 // Check the consistency of vm_init_args 2404 bool Arguments::check_vm_args_consistency() { 2405 // Method for adding checks for flag consistency. 2406 // The intent is to warn the user of all possible conflicts, 2407 // before returning an error. 2408 // Note: Needs platform-dependent factoring. 2409 bool status = true; 2410 2411 if (TLABRefillWasteFraction == 0) { 2412 jio_fprintf(defaultStream::error_stream(), 2413 "TLABRefillWasteFraction should be a denominator, " 2414 "not " SIZE_FORMAT "\n", 2415 TLABRefillWasteFraction); 2416 status = false; 2417 } 2418 2419 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2420 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2421 } 2422 2423 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2424 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2425 } 2426 2427 if (GCTimeLimit == 100) { 2428 // Turn off gc-overhead-limit-exceeded checks 2429 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2430 } 2431 2432 status = status && check_gc_consistency(); 2433 2434 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2435 // insists that we hold the requisite locks so that the iteration is 2436 // MT-safe. For the verification at start-up and shut-down, we don't 2437 // yet have a good way of acquiring and releasing these locks, 2438 // which are not visible at the CollectedHeap level. We want to 2439 // be able to acquire these locks and then do the iteration rather 2440 // than just disable the lock verification. This will be fixed under 2441 // bug 4788986. 2442 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2443 if (VerifyDuringStartup) { 2444 warning("Heap verification at start-up disabled " 2445 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2446 VerifyDuringStartup = false; // Disable verification at start-up 2447 } 2448 2449 if (VerifyBeforeExit) { 2450 warning("Heap verification at shutdown disabled " 2451 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2452 VerifyBeforeExit = false; // Disable verification at shutdown 2453 } 2454 } 2455 2456 if (PrintNMTStatistics) { 2457 #if INCLUDE_NMT 2458 if (MemTracker::tracking_level() == NMT_off) { 2459 #endif // INCLUDE_NMT 2460 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2461 PrintNMTStatistics = false; 2462 #if INCLUDE_NMT 2463 } 2464 #endif 2465 } 2466 #if INCLUDE_JVMCI 2467 if (EnableJVMCI) { 2468 if (!ScavengeRootsInCode) { 2469 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2470 ScavengeRootsInCode = 1; 2471 } 2472 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 2473 TypeProfileLevel = 0; 2474 } 2475 if (UseJVMCICompiler) { 2476 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 2477 TypeProfileWidth = 8; 2478 } 2479 } 2480 } 2481 #endif 2482 2483 // Check lower bounds of the code cache 2484 // Template Interpreter code is approximately 3X larger in debug builds. 2485 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2486 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2487 jio_fprintf(defaultStream::error_stream(), 2488 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2489 os::vm_page_size()/K); 2490 status = false; 2491 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2492 jio_fprintf(defaultStream::error_stream(), 2493 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2494 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2495 status = false; 2496 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2497 jio_fprintf(defaultStream::error_stream(), 2498 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2499 min_code_cache_size/K); 2500 status = false; 2501 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2502 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2503 jio_fprintf(defaultStream::error_stream(), 2504 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2505 CODE_CACHE_SIZE_LIMIT/M); 2506 status = false; 2507 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2508 jio_fprintf(defaultStream::error_stream(), 2509 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2510 min_code_cache_size/K); 2511 status = false; 2512 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2513 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2514 jio_fprintf(defaultStream::error_stream(), 2515 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2516 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2517 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2518 status = false; 2519 } 2520 2521 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2522 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2523 } 2524 2525 return status; 2526 } 2527 2528 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2529 const char* option_type) { 2530 if (ignore) return false; 2531 2532 const char* spacer = " "; 2533 if (option_type == NULL) { 2534 option_type = ++spacer; // Set both to the empty string. 2535 } 2536 2537 if (os::obsolete_option(option)) { 2538 jio_fprintf(defaultStream::error_stream(), 2539 "Obsolete %s%soption: %s\n", option_type, spacer, 2540 option->optionString); 2541 return false; 2542 } else { 2543 jio_fprintf(defaultStream::error_stream(), 2544 "Unrecognized %s%soption: %s\n", option_type, spacer, 2545 option->optionString); 2546 return true; 2547 } 2548 } 2549 2550 static const char* user_assertion_options[] = { 2551 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2552 }; 2553 2554 static const char* system_assertion_options[] = { 2555 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2556 }; 2557 2558 bool Arguments::parse_uintx(const char* value, 2559 uintx* uintx_arg, 2560 uintx min_size) { 2561 2562 // Check the sign first since atomull() parses only unsigned values. 2563 bool value_is_positive = !(*value == '-'); 2564 2565 if (value_is_positive) { 2566 julong n; 2567 bool good_return = atomull(value, &n); 2568 if (good_return) { 2569 bool above_minimum = n >= min_size; 2570 bool value_is_too_large = n > max_uintx; 2571 2572 if (above_minimum && !value_is_too_large) { 2573 *uintx_arg = n; 2574 return true; 2575 } 2576 } 2577 } 2578 return false; 2579 } 2580 2581 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2582 julong* long_arg, 2583 julong min_size) { 2584 if (!atomull(s, long_arg)) return arg_unreadable; 2585 return check_memory_size(*long_arg, min_size); 2586 } 2587 2588 // Parse JavaVMInitArgs structure 2589 2590 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2591 const JavaVMInitArgs *java_options_args, 2592 const JavaVMInitArgs *cmd_line_args) { 2593 // For components of the system classpath. 2594 SysClassPath scp(Arguments::get_sysclasspath()); 2595 bool scp_assembly_required = false; 2596 2597 // Save default settings for some mode flags 2598 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2599 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2600 Arguments::_ClipInlining = ClipInlining; 2601 Arguments::_BackgroundCompilation = BackgroundCompilation; 2602 if (TieredCompilation) { 2603 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2604 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2605 } 2606 2607 // Setup flags for mixed which is the default 2608 set_mode_flags(_mixed); 2609 2610 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2611 // variable (if present). 2612 jint result = parse_each_vm_init_arg( 2613 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2614 if (result != JNI_OK) { 2615 return result; 2616 } 2617 2618 // Parse args structure generated from the command line flags. 2619 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required, 2620 Flag::COMMAND_LINE); 2621 if (result != JNI_OK) { 2622 return result; 2623 } 2624 2625 // Parse args structure generated from the _JAVA_OPTIONS environment 2626 // variable (if present) (mimics classic VM) 2627 result = parse_each_vm_init_arg( 2628 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2629 if (result != JNI_OK) { 2630 return result; 2631 } 2632 2633 // Do final processing now that all arguments have been parsed 2634 result = finalize_vm_init_args(&scp, scp_assembly_required); 2635 if (result != JNI_OK) { 2636 return result; 2637 } 2638 2639 return JNI_OK; 2640 } 2641 2642 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2643 // represents a valid JDWP agent. is_path==true denotes that we 2644 // are dealing with -agentpath (case where name is a path), otherwise with 2645 // -agentlib 2646 bool valid_jdwp_agent(char *name, bool is_path) { 2647 char *_name; 2648 const char *_jdwp = "jdwp"; 2649 size_t _len_jdwp, _len_prefix; 2650 2651 if (is_path) { 2652 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2653 return false; 2654 } 2655 2656 _name++; // skip past last path separator 2657 _len_prefix = strlen(JNI_LIB_PREFIX); 2658 2659 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2660 return false; 2661 } 2662 2663 _name += _len_prefix; 2664 _len_jdwp = strlen(_jdwp); 2665 2666 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2667 _name += _len_jdwp; 2668 } 2669 else { 2670 return false; 2671 } 2672 2673 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2674 return false; 2675 } 2676 2677 return true; 2678 } 2679 2680 if (strcmp(name, _jdwp) == 0) { 2681 return true; 2682 } 2683 2684 return false; 2685 } 2686 2687 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2688 SysClassPath* scp_p, 2689 bool* scp_assembly_required_p, 2690 Flag::Flags origin) { 2691 // Remaining part of option string 2692 const char* tail; 2693 2694 // iterate over arguments 2695 for (int index = 0; index < args->nOptions; index++) { 2696 bool is_absolute_path = false; // for -agentpath vs -agentlib 2697 2698 const JavaVMOption* option = args->options + index; 2699 2700 if (!match_option(option, "-Djava.class.path", &tail) && 2701 !match_option(option, "-Dsun.java.command", &tail) && 2702 !match_option(option, "-Dsun.java.launcher", &tail)) { 2703 2704 // add all jvm options to the jvm_args string. This string 2705 // is used later to set the java.vm.args PerfData string constant. 2706 // the -Djava.class.path and the -Dsun.java.command options are 2707 // omitted from jvm_args string as each have their own PerfData 2708 // string constant object. 2709 build_jvm_args(option->optionString); 2710 } 2711 2712 // -verbose:[class/gc/jni] 2713 if (match_option(option, "-verbose", &tail)) { 2714 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2715 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) { 2716 return JNI_EINVAL; 2717 } 2718 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) { 2719 return JNI_EINVAL; 2720 } 2721 } else if (!strcmp(tail, ":gc")) { 2722 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 2723 return JNI_EINVAL; 2724 } 2725 } else if (!strcmp(tail, ":jni")) { 2726 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2727 return JNI_EINVAL; 2728 } 2729 } 2730 // -da / -ea / -disableassertions / -enableassertions 2731 // These accept an optional class/package name separated by a colon, e.g., 2732 // -da:java.lang.Thread. 2733 } else if (match_option(option, user_assertion_options, &tail, true)) { 2734 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2735 if (*tail == '\0') { 2736 JavaAssertions::setUserClassDefault(enable); 2737 } else { 2738 assert(*tail == ':', "bogus match by match_option()"); 2739 JavaAssertions::addOption(tail + 1, enable); 2740 } 2741 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2742 } else if (match_option(option, system_assertion_options, &tail, false)) { 2743 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2744 JavaAssertions::setSystemClassDefault(enable); 2745 // -bootclasspath: 2746 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2747 scp_p->reset_path(tail); 2748 *scp_assembly_required_p = true; 2749 // -bootclasspath/a: 2750 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2751 scp_p->add_suffix(tail); 2752 *scp_assembly_required_p = true; 2753 // -bootclasspath/p: 2754 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2755 scp_p->add_prefix(tail); 2756 *scp_assembly_required_p = true; 2757 // -Xrun 2758 } else if (match_option(option, "-Xrun", &tail)) { 2759 if (tail != NULL) { 2760 const char* pos = strchr(tail, ':'); 2761 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2762 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2763 name[len] = '\0'; 2764 2765 char *options = NULL; 2766 if(pos != NULL) { 2767 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2768 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2769 } 2770 #if !INCLUDE_JVMTI 2771 if (strcmp(name, "jdwp") == 0) { 2772 jio_fprintf(defaultStream::error_stream(), 2773 "Debugging agents are not supported in this VM\n"); 2774 return JNI_ERR; 2775 } 2776 #endif // !INCLUDE_JVMTI 2777 add_init_library(name, options); 2778 } 2779 // -agentlib and -agentpath 2780 } else if (match_option(option, "-agentlib:", &tail) || 2781 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2782 if(tail != NULL) { 2783 const char* pos = strchr(tail, '='); 2784 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2785 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2786 name[len] = '\0'; 2787 2788 char *options = NULL; 2789 if(pos != NULL) { 2790 options = os::strdup_check_oom(pos + 1, mtInternal); 2791 } 2792 #if !INCLUDE_JVMTI 2793 if (valid_jdwp_agent(name, is_absolute_path)) { 2794 jio_fprintf(defaultStream::error_stream(), 2795 "Debugging agents are not supported in this VM\n"); 2796 return JNI_ERR; 2797 } 2798 #endif // !INCLUDE_JVMTI 2799 add_init_agent(name, options, is_absolute_path); 2800 } 2801 // -javaagent 2802 } else if (match_option(option, "-javaagent:", &tail)) { 2803 #if !INCLUDE_JVMTI 2804 jio_fprintf(defaultStream::error_stream(), 2805 "Instrumentation agents are not supported in this VM\n"); 2806 return JNI_ERR; 2807 #else 2808 if(tail != NULL) { 2809 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2810 add_init_agent("instrument", options, false); 2811 } 2812 #endif // !INCLUDE_JVMTI 2813 // -Xnoclassgc 2814 } else if (match_option(option, "-Xnoclassgc")) { 2815 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2816 return JNI_EINVAL; 2817 } 2818 // -Xconcgc 2819 } else if (match_option(option, "-Xconcgc")) { 2820 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2821 return JNI_EINVAL; 2822 } 2823 // -Xnoconcgc 2824 } else if (match_option(option, "-Xnoconcgc")) { 2825 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2826 return JNI_EINVAL; 2827 } 2828 // -Xbatch 2829 } else if (match_option(option, "-Xbatch")) { 2830 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2831 return JNI_EINVAL; 2832 } 2833 // -Xmn for compatibility with other JVM vendors 2834 } else if (match_option(option, "-Xmn", &tail)) { 2835 julong long_initial_young_size = 0; 2836 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2837 if (errcode != arg_in_range) { 2838 jio_fprintf(defaultStream::error_stream(), 2839 "Invalid initial young generation size: %s\n", option->optionString); 2840 describe_range_error(errcode); 2841 return JNI_EINVAL; 2842 } 2843 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2844 return JNI_EINVAL; 2845 } 2846 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2847 return JNI_EINVAL; 2848 } 2849 // -Xms 2850 } else if (match_option(option, "-Xms", &tail)) { 2851 julong long_initial_heap_size = 0; 2852 // an initial heap size of 0 means automatically determine 2853 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2854 if (errcode != arg_in_range) { 2855 jio_fprintf(defaultStream::error_stream(), 2856 "Invalid initial heap size: %s\n", option->optionString); 2857 describe_range_error(errcode); 2858 return JNI_EINVAL; 2859 } 2860 set_min_heap_size((size_t)long_initial_heap_size); 2861 // Currently the minimum size and the initial heap sizes are the same. 2862 // Can be overridden with -XX:InitialHeapSize. 2863 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2864 return JNI_EINVAL; 2865 } 2866 // -Xmx 2867 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2868 julong long_max_heap_size = 0; 2869 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2870 if (errcode != arg_in_range) { 2871 jio_fprintf(defaultStream::error_stream(), 2872 "Invalid maximum heap size: %s\n", option->optionString); 2873 describe_range_error(errcode); 2874 return JNI_EINVAL; 2875 } 2876 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2877 return JNI_EINVAL; 2878 } 2879 // Xmaxf 2880 } else if (match_option(option, "-Xmaxf", &tail)) { 2881 char* err; 2882 int maxf = (int)(strtod(tail, &err) * 100); 2883 if (*err != '\0' || *tail == '\0') { 2884 jio_fprintf(defaultStream::error_stream(), 2885 "Bad max heap free percentage size: %s\n", 2886 option->optionString); 2887 return JNI_EINVAL; 2888 } else { 2889 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2890 return JNI_EINVAL; 2891 } 2892 } 2893 // Xminf 2894 } else if (match_option(option, "-Xminf", &tail)) { 2895 char* err; 2896 int minf = (int)(strtod(tail, &err) * 100); 2897 if (*err != '\0' || *tail == '\0') { 2898 jio_fprintf(defaultStream::error_stream(), 2899 "Bad min heap free percentage size: %s\n", 2900 option->optionString); 2901 return JNI_EINVAL; 2902 } else { 2903 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2904 return JNI_EINVAL; 2905 } 2906 } 2907 // -Xss 2908 } else if (match_option(option, "-Xss", &tail)) { 2909 julong long_ThreadStackSize = 0; 2910 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2911 if (errcode != arg_in_range) { 2912 jio_fprintf(defaultStream::error_stream(), 2913 "Invalid thread stack size: %s\n", option->optionString); 2914 describe_range_error(errcode); 2915 return JNI_EINVAL; 2916 } 2917 // Internally track ThreadStackSize in units of 1024 bytes. 2918 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2919 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2920 return JNI_EINVAL; 2921 } 2922 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads 2923 } else if (match_option(option, "-Xoss", &tail) || 2924 match_option(option, "-Xsqnopause") || 2925 match_option(option, "-Xoptimize") || 2926 match_option(option, "-Xboundthreads")) { 2927 // All these options are deprecated in JDK 9 and will be removed in a future release 2928 char version[256]; 2929 JDK_Version::jdk(9).to_string(version, sizeof(version)); 2930 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2931 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2932 julong long_CodeCacheExpansionSize = 0; 2933 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2934 if (errcode != arg_in_range) { 2935 jio_fprintf(defaultStream::error_stream(), 2936 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2937 os::vm_page_size()/K); 2938 return JNI_EINVAL; 2939 } 2940 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 2941 return JNI_EINVAL; 2942 } 2943 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2944 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2945 julong long_ReservedCodeCacheSize = 0; 2946 2947 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2948 if (errcode != arg_in_range) { 2949 jio_fprintf(defaultStream::error_stream(), 2950 "Invalid maximum code cache size: %s.\n", option->optionString); 2951 return JNI_EINVAL; 2952 } 2953 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 2954 return JNI_EINVAL; 2955 } 2956 // -XX:NonNMethodCodeHeapSize= 2957 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2958 julong long_NonNMethodCodeHeapSize = 0; 2959 2960 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2961 if (errcode != arg_in_range) { 2962 jio_fprintf(defaultStream::error_stream(), 2963 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2964 return JNI_EINVAL; 2965 } 2966 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 2967 return JNI_EINVAL; 2968 } 2969 // -XX:ProfiledCodeHeapSize= 2970 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2971 julong long_ProfiledCodeHeapSize = 0; 2972 2973 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2974 if (errcode != arg_in_range) { 2975 jio_fprintf(defaultStream::error_stream(), 2976 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2977 return JNI_EINVAL; 2978 } 2979 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 2980 return JNI_EINVAL; 2981 } 2982 // -XX:NonProfiledCodeHeapSizee= 2983 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2984 julong long_NonProfiledCodeHeapSize = 0; 2985 2986 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2987 if (errcode != arg_in_range) { 2988 jio_fprintf(defaultStream::error_stream(), 2989 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2990 return JNI_EINVAL; 2991 } 2992 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 2993 return JNI_EINVAL; 2994 } 2995 // -green 2996 } else if (match_option(option, "-green")) { 2997 jio_fprintf(defaultStream::error_stream(), 2998 "Green threads support not available\n"); 2999 return JNI_EINVAL; 3000 // -native 3001 } else if (match_option(option, "-native")) { 3002 // HotSpot always uses native threads, ignore silently for compatibility 3003 // -Xrs 3004 } else if (match_option(option, "-Xrs")) { 3005 // Classic/EVM option, new functionality 3006 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3007 return JNI_EINVAL; 3008 } 3009 } else if (match_option(option, "-Xusealtsigs")) { 3010 // change default internal VM signals used - lower case for back compat 3011 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) { 3012 return JNI_EINVAL; 3013 } 3014 // -Xprof 3015 } else if (match_option(option, "-Xprof")) { 3016 #if INCLUDE_FPROF 3017 _has_profile = true; 3018 #else // INCLUDE_FPROF 3019 jio_fprintf(defaultStream::error_stream(), 3020 "Flat profiling is not supported in this VM.\n"); 3021 return JNI_ERR; 3022 #endif // INCLUDE_FPROF 3023 // -Xconcurrentio 3024 } else if (match_option(option, "-Xconcurrentio")) { 3025 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3026 return JNI_EINVAL; 3027 } 3028 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3029 return JNI_EINVAL; 3030 } 3031 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3032 return JNI_EINVAL; 3033 } 3034 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3035 return JNI_EINVAL; 3036 } 3037 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3038 return JNI_EINVAL; 3039 } 3040 3041 // -Xinternalversion 3042 } else if (match_option(option, "-Xinternalversion")) { 3043 jio_fprintf(defaultStream::output_stream(), "%s\n", 3044 VM_Version::internal_vm_info_string()); 3045 vm_exit(0); 3046 #ifndef PRODUCT 3047 // -Xprintflags 3048 } else if (match_option(option, "-Xprintflags")) { 3049 CommandLineFlags::printFlags(tty, false); 3050 vm_exit(0); 3051 #endif 3052 // -D 3053 } else if (match_option(option, "-D", &tail)) { 3054 const char* value; 3055 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3056 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3057 // abort if -Djava.endorsed.dirs is set 3058 jio_fprintf(defaultStream::output_stream(), 3059 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3060 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3061 return JNI_EINVAL; 3062 } 3063 if (match_option(option, "-Djava.ext.dirs=", &value) && 3064 *value != '\0' && strcmp(value, "\"\"") != 0) { 3065 // abort if -Djava.ext.dirs is set 3066 jio_fprintf(defaultStream::output_stream(), 3067 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3068 return JNI_EINVAL; 3069 } 3070 3071 if (!add_property(tail)) { 3072 return JNI_ENOMEM; 3073 } 3074 // Out of the box management support 3075 if (match_option(option, "-Dcom.sun.management", &tail)) { 3076 #if INCLUDE_MANAGEMENT 3077 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3078 return JNI_EINVAL; 3079 } 3080 #else 3081 jio_fprintf(defaultStream::output_stream(), 3082 "-Dcom.sun.management is not supported in this VM.\n"); 3083 return JNI_ERR; 3084 #endif 3085 } 3086 // -Xint 3087 } else if (match_option(option, "-Xint")) { 3088 set_mode_flags(_int); 3089 // -Xmixed 3090 } else if (match_option(option, "-Xmixed")) { 3091 set_mode_flags(_mixed); 3092 // -Xcomp 3093 } else if (match_option(option, "-Xcomp")) { 3094 // for testing the compiler; turn off all flags that inhibit compilation 3095 set_mode_flags(_comp); 3096 // -Xshare:dump 3097 } else if (match_option(option, "-Xshare:dump")) { 3098 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3099 return JNI_EINVAL; 3100 } 3101 set_mode_flags(_int); // Prevent compilation, which creates objects 3102 // -Xshare:on 3103 } else if (match_option(option, "-Xshare:on")) { 3104 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3105 return JNI_EINVAL; 3106 } 3107 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3108 return JNI_EINVAL; 3109 } 3110 // -Xshare:auto 3111 } else if (match_option(option, "-Xshare:auto")) { 3112 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3113 return JNI_EINVAL; 3114 } 3115 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3116 return JNI_EINVAL; 3117 } 3118 // -Xshare:off 3119 } else if (match_option(option, "-Xshare:off")) { 3120 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3121 return JNI_EINVAL; 3122 } 3123 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3124 return JNI_EINVAL; 3125 } 3126 // -Xverify 3127 } else if (match_option(option, "-Xverify", &tail)) { 3128 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3129 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3130 return JNI_EINVAL; 3131 } 3132 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3133 return JNI_EINVAL; 3134 } 3135 } else if (strcmp(tail, ":remote") == 0) { 3136 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3137 return JNI_EINVAL; 3138 } 3139 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3140 return JNI_EINVAL; 3141 } 3142 } else if (strcmp(tail, ":none") == 0) { 3143 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3144 return JNI_EINVAL; 3145 } 3146 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3147 return JNI_EINVAL; 3148 } 3149 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3150 return JNI_EINVAL; 3151 } 3152 // -Xdebug 3153 } else if (match_option(option, "-Xdebug")) { 3154 // note this flag has been used, then ignore 3155 set_xdebug_mode(true); 3156 // -Xnoagent 3157 } else if (match_option(option, "-Xnoagent")) { 3158 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3159 } else if (match_option(option, "-Xloggc:", &tail)) { 3160 // Redirect GC output to the file. -Xloggc:<filename> 3161 // ostream_init_log(), when called will use this filename 3162 // to initialize a fileStream. 3163 _gc_log_filename = os::strdup_check_oom(tail); 3164 if (!is_filename_valid(_gc_log_filename)) { 3165 jio_fprintf(defaultStream::output_stream(), 3166 "Invalid file name for use with -Xloggc: Filename can only contain the " 3167 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3168 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3169 return JNI_EINVAL; 3170 } 3171 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 3172 return JNI_EINVAL; 3173 } 3174 } else if (match_option(option, "-Xlog", &tail)) { 3175 bool ret = false; 3176 if (strcmp(tail, ":help") == 0) { 3177 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3178 vm_exit(0); 3179 } else if (strcmp(tail, ":disable") == 0) { 3180 LogConfiguration::disable_logging(); 3181 ret = true; 3182 } else if (*tail == '\0') { 3183 ret = LogConfiguration::parse_command_line_arguments(); 3184 assert(ret, "-Xlog without arguments should never fail to parse"); 3185 } else if (*tail == ':') { 3186 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3187 } 3188 if (ret == false) { 3189 jio_fprintf(defaultStream::error_stream(), 3190 "Invalid -Xlog option '-Xlog%s'\n", 3191 tail); 3192 return JNI_EINVAL; 3193 } 3194 // JNI hooks 3195 } else if (match_option(option, "-Xcheck", &tail)) { 3196 if (!strcmp(tail, ":jni")) { 3197 #if !INCLUDE_JNI_CHECK 3198 warning("JNI CHECKING is not supported in this VM"); 3199 #else 3200 CheckJNICalls = true; 3201 #endif // INCLUDE_JNI_CHECK 3202 } else if (is_bad_option(option, args->ignoreUnrecognized, 3203 "check")) { 3204 return JNI_EINVAL; 3205 } 3206 } else if (match_option(option, "vfprintf")) { 3207 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3208 } else if (match_option(option, "exit")) { 3209 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3210 } else if (match_option(option, "abort")) { 3211 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3212 // -XX:+AggressiveHeap 3213 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3214 jint result = set_aggressive_heap_flags(); 3215 if (result != JNI_OK) { 3216 return result; 3217 } 3218 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3219 // and the last option wins. 3220 } else if (match_option(option, "-XX:+NeverTenure")) { 3221 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3222 return JNI_EINVAL; 3223 } 3224 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3225 return JNI_EINVAL; 3226 } 3227 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3228 return JNI_EINVAL; 3229 } 3230 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3231 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3232 return JNI_EINVAL; 3233 } 3234 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3235 return JNI_EINVAL; 3236 } 3237 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3238 return JNI_EINVAL; 3239 } 3240 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3241 uintx max_tenuring_thresh = 0; 3242 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3243 jio_fprintf(defaultStream::error_stream(), 3244 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3245 return JNI_EINVAL; 3246 } 3247 3248 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3249 return JNI_EINVAL; 3250 } 3251 3252 if (MaxTenuringThreshold == 0) { 3253 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3254 return JNI_EINVAL; 3255 } 3256 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3257 return JNI_EINVAL; 3258 } 3259 } else { 3260 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3261 return JNI_EINVAL; 3262 } 3263 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3264 return JNI_EINVAL; 3265 } 3266 } 3267 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3268 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3269 return JNI_EINVAL; 3270 } 3271 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3272 return JNI_EINVAL; 3273 } 3274 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3275 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3276 return JNI_EINVAL; 3277 } 3278 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3279 return JNI_EINVAL; 3280 } 3281 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3282 #if defined(DTRACE_ENABLED) 3283 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3284 return JNI_EINVAL; 3285 } 3286 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3287 return JNI_EINVAL; 3288 } 3289 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3290 return JNI_EINVAL; 3291 } 3292 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3293 return JNI_EINVAL; 3294 } 3295 #else // defined(DTRACE_ENABLED) 3296 jio_fprintf(defaultStream::error_stream(), 3297 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3298 return JNI_EINVAL; 3299 #endif // defined(DTRACE_ENABLED) 3300 #ifdef ASSERT 3301 } else if (match_option(option, "-XX:+FullGCALot")) { 3302 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3303 return JNI_EINVAL; 3304 } 3305 // disable scavenge before parallel mark-compact 3306 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3307 return JNI_EINVAL; 3308 } 3309 #endif 3310 #if !INCLUDE_MANAGEMENT 3311 } else if (match_option(option, "-XX:+ManagementServer")) { 3312 jio_fprintf(defaultStream::error_stream(), 3313 "ManagementServer is not supported in this VM.\n"); 3314 return JNI_ERR; 3315 #endif // INCLUDE_MANAGEMENT 3316 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3317 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3318 // already been handled 3319 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3320 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3321 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3322 return JNI_EINVAL; 3323 } 3324 } 3325 // Unknown option 3326 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3327 return JNI_ERR; 3328 } 3329 } 3330 3331 // PrintSharedArchiveAndExit will turn on 3332 // -Xshare:on 3333 // -XX:+TraceClassPaths 3334 if (PrintSharedArchiveAndExit) { 3335 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3336 return JNI_EINVAL; 3337 } 3338 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3339 return JNI_EINVAL; 3340 } 3341 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) { 3342 return JNI_EINVAL; 3343 } 3344 } 3345 3346 // Change the default value for flags which have different default values 3347 // when working with older JDKs. 3348 #ifdef LINUX 3349 if (JDK_Version::current().compare_major(6) <= 0 && 3350 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3351 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3352 } 3353 #endif // LINUX 3354 fix_appclasspath(); 3355 return JNI_OK; 3356 } 3357 3358 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3359 // 3360 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3361 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3362 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3363 // path is treated as the current directory. 3364 // 3365 // This causes problems with CDS, which requires that all directories specified in the classpath 3366 // must be empty. In most cases, applications do NOT want to load classes from the current 3367 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3368 // scripts compatible with CDS. 3369 void Arguments::fix_appclasspath() { 3370 if (IgnoreEmptyClassPaths) { 3371 const char separator = *os::path_separator(); 3372 const char* src = _java_class_path->value(); 3373 3374 // skip over all the leading empty paths 3375 while (*src == separator) { 3376 src ++; 3377 } 3378 3379 char* copy = os::strdup_check_oom(src, mtInternal); 3380 3381 // trim all trailing empty paths 3382 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3383 *tail = '\0'; 3384 } 3385 3386 char from[3] = {separator, separator, '\0'}; 3387 char to [2] = {separator, '\0'}; 3388 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3389 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3390 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3391 } 3392 3393 _java_class_path->set_value(copy); 3394 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3395 } 3396 3397 if (!PrintSharedArchiveAndExit) { 3398 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3399 } 3400 } 3401 3402 static bool has_jar_files(const char* directory) { 3403 DIR* dir = os::opendir(directory); 3404 if (dir == NULL) return false; 3405 3406 struct dirent *entry; 3407 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3408 bool hasJarFile = false; 3409 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3410 const char* name = entry->d_name; 3411 const char* ext = name + strlen(name) - 4; 3412 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3413 } 3414 FREE_C_HEAP_ARRAY(char, dbuf); 3415 os::closedir(dir); 3416 return hasJarFile ; 3417 } 3418 3419 static int check_non_empty_dirs(const char* path) { 3420 const char separator = *os::path_separator(); 3421 const char* const end = path + strlen(path); 3422 int nonEmptyDirs = 0; 3423 while (path < end) { 3424 const char* tmp_end = strchr(path, separator); 3425 if (tmp_end == NULL) { 3426 if (has_jar_files(path)) { 3427 nonEmptyDirs++; 3428 jio_fprintf(defaultStream::output_stream(), 3429 "Non-empty directory: %s\n", path); 3430 } 3431 path = end; 3432 } else { 3433 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3434 memcpy(dirpath, path, tmp_end - path); 3435 dirpath[tmp_end - path] = '\0'; 3436 if (has_jar_files(dirpath)) { 3437 nonEmptyDirs++; 3438 jio_fprintf(defaultStream::output_stream(), 3439 "Non-empty directory: %s\n", dirpath); 3440 } 3441 FREE_C_HEAP_ARRAY(char, dirpath); 3442 path = tmp_end + 1; 3443 } 3444 } 3445 return nonEmptyDirs; 3446 } 3447 3448 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3449 // check if the default lib/endorsed directory exists; if so, error 3450 char path[JVM_MAXPATHLEN]; 3451 const char* fileSep = os::file_separator(); 3452 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3453 3454 #if INCLUDE_JVMCI 3455 jint res = JVMCIRuntime::save_options(_system_properties); 3456 if (res != JNI_OK) { 3457 return res; 3458 } 3459 3460 if (EnableJVMCI) { 3461 // Append lib/jvmci/*.jar to boot class path 3462 char jvmciDir[JVM_MAXPATHLEN]; 3463 const char* fileSep = os::file_separator(); 3464 jio_snprintf(jvmciDir, sizeof(jvmciDir), "%s%slib%sjvmci", Arguments::get_java_home(), fileSep, fileSep); 3465 DIR* dir = os::opendir(jvmciDir); 3466 if (dir != NULL) { 3467 struct dirent *entry; 3468 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(jvmciDir), mtInternal); 3469 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3470 const char* name = entry->d_name; 3471 const char* ext = name + strlen(name) - 4; 3472 if (ext > name && strcmp(ext, ".jar") == 0) { 3473 char fileName[JVM_MAXPATHLEN]; 3474 jio_snprintf(fileName, sizeof(fileName), "%s%s%s", jvmciDir, fileSep, name); 3475 scp_p->add_suffix(fileName); 3476 scp_assembly_required = true; 3477 } 3478 } 3479 FREE_C_HEAP_ARRAY(char, dbuf); 3480 os::closedir(dir); 3481 } 3482 } 3483 #endif // INCLUDE_JVMCI 3484 3485 if (CheckEndorsedAndExtDirs) { 3486 int nonEmptyDirs = 0; 3487 // check endorsed directory 3488 nonEmptyDirs += check_non_empty_dirs(path); 3489 // check the extension directories 3490 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3491 if (nonEmptyDirs > 0) { 3492 return JNI_ERR; 3493 } 3494 } 3495 3496 DIR* dir = os::opendir(path); 3497 if (dir != NULL) { 3498 jio_fprintf(defaultStream::output_stream(), 3499 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3500 "in modular form will be supported via the concept of upgradeable modules.\n"); 3501 os::closedir(dir); 3502 return JNI_ERR; 3503 } 3504 3505 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3506 dir = os::opendir(path); 3507 if (dir != NULL) { 3508 jio_fprintf(defaultStream::output_stream(), 3509 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3510 "Use -classpath instead.\n."); 3511 os::closedir(dir); 3512 return JNI_ERR; 3513 } 3514 3515 if (scp_assembly_required) { 3516 // Assemble the bootclasspath elements into the final path. 3517 char *combined_path = scp_p->combined_path(); 3518 Arguments::set_sysclasspath(combined_path); 3519 FREE_C_HEAP_ARRAY(char, combined_path); 3520 } 3521 3522 // This must be done after all arguments have been processed. 3523 // java_compiler() true means set to "NONE" or empty. 3524 if (java_compiler() && !xdebug_mode()) { 3525 // For backwards compatibility, we switch to interpreted mode if 3526 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3527 // not specified. 3528 set_mode_flags(_int); 3529 } 3530 3531 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3532 // but like -Xint, leave compilation thresholds unaffected. 3533 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3534 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3535 set_mode_flags(_int); 3536 } 3537 3538 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3539 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3540 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3541 } 3542 3543 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3544 // Don't degrade server performance for footprint 3545 if (FLAG_IS_DEFAULT(UseLargePages) && 3546 MaxHeapSize < LargePageHeapSizeThreshold) { 3547 // No need for large granularity pages w/small heaps. 3548 // Note that large pages are enabled/disabled for both the 3549 // Java heap and the code cache. 3550 FLAG_SET_DEFAULT(UseLargePages, false); 3551 } 3552 3553 #elif defined(COMPILER2) 3554 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3555 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3556 } 3557 #endif 3558 3559 #ifndef TIERED 3560 // Tiered compilation is undefined. 3561 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3562 #endif 3563 3564 // If we are running in a headless jre, force java.awt.headless property 3565 // to be true unless the property has already been set. 3566 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3567 if (os::is_headless_jre()) { 3568 const char* headless = Arguments::get_property("java.awt.headless"); 3569 if (headless == NULL) { 3570 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3571 if (headless_env == NULL) { 3572 if (!add_property("java.awt.headless=true")) { 3573 return JNI_ENOMEM; 3574 } 3575 } else { 3576 char buffer[256]; 3577 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3578 if (!add_property(buffer)) { 3579 return JNI_ENOMEM; 3580 } 3581 } 3582 } 3583 } 3584 3585 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3586 // CMS can only be used with ParNew 3587 FLAG_SET_ERGO(bool, UseParNewGC, true); 3588 } 3589 3590 if (!check_vm_args_consistency()) { 3591 return JNI_ERR; 3592 } 3593 3594 return JNI_OK; 3595 } 3596 3597 // Helper class for controlling the lifetime of JavaVMInitArgs 3598 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3599 // deleted on the destruction of the ScopedVMInitArgs object. 3600 class ScopedVMInitArgs : public StackObj { 3601 private: 3602 JavaVMInitArgs _args; 3603 bool _is_set; 3604 3605 public: 3606 ScopedVMInitArgs() { 3607 _args.version = JNI_VERSION_1_2; 3608 _args.nOptions = 0; 3609 _args.options = NULL; 3610 _args.ignoreUnrecognized = false; 3611 _is_set = false; 3612 } 3613 3614 // Populates the JavaVMInitArgs object represented by this 3615 // ScopedVMInitArgs object with the arguments in options. The 3616 // allocated memory is deleted by the destructor. If this method 3617 // returns anything other than JNI_OK, then this object is in a 3618 // partially constructed state, and should be abandoned. 3619 jint set_args(GrowableArray<JavaVMOption>* options) { 3620 _is_set = true; 3621 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3622 JavaVMOption, options->length(), mtInternal); 3623 if (options_arr == NULL) { 3624 return JNI_ENOMEM; 3625 } 3626 _args.options = options_arr; 3627 3628 for (int i = 0; i < options->length(); i++) { 3629 options_arr[i] = options->at(i); 3630 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3631 if (options_arr[i].optionString == NULL) { 3632 // Rely on the destructor to do cleanup. 3633 _args.nOptions = i; 3634 return JNI_ENOMEM; 3635 } 3636 } 3637 3638 _args.nOptions = options->length(); 3639 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3640 return JNI_OK; 3641 } 3642 3643 JavaVMInitArgs* get() { return &_args; } 3644 bool is_set() { return _is_set; } 3645 3646 ~ScopedVMInitArgs() { 3647 if (_args.options == NULL) return; 3648 for (int i = 0; i < _args.nOptions; i++) { 3649 os::free(_args.options[i].optionString); 3650 } 3651 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3652 } 3653 3654 // Insert options into this option list, to replace option at 3655 // vm_options_file_pos (-XX:VMOptionsFile) 3656 jint insert(const JavaVMInitArgs* args, 3657 const JavaVMInitArgs* args_to_insert, 3658 const int vm_options_file_pos) { 3659 assert(_args.options == NULL, "shouldn't be set yet"); 3660 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3661 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3662 3663 int length = args->nOptions + args_to_insert->nOptions - 1; 3664 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) 3665 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3666 for (int i = 0; i < args->nOptions; i++) { 3667 if (i == vm_options_file_pos) { 3668 // insert the new options starting at the same place as the 3669 // -XX:VMOptionsFile option 3670 for (int j = 0; j < args_to_insert->nOptions; j++) { 3671 options->push(args_to_insert->options[j]); 3672 } 3673 } else { 3674 options->push(args->options[i]); 3675 } 3676 } 3677 // make into options array 3678 jint result = set_args(options); 3679 delete options; 3680 return result; 3681 } 3682 }; 3683 3684 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3685 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3686 } 3687 3688 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3689 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3690 } 3691 3692 jint Arguments::parse_options_environment_variable(const char* name, 3693 ScopedVMInitArgs* vm_args) { 3694 char *buffer = ::getenv(name); 3695 3696 // Don't check this environment variable if user has special privileges 3697 // (e.g. unix su command). 3698 if (buffer == NULL || os::have_special_privileges()) { 3699 return JNI_OK; 3700 } 3701 3702 if ((buffer = os::strdup(buffer)) == NULL) { 3703 return JNI_ENOMEM; 3704 } 3705 3706 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3707 3708 os::free(buffer); 3709 return retcode; 3710 } 3711 3712 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3713 // read file into buffer 3714 int fd = ::open(file_name, O_RDONLY); 3715 if (fd < 0) { 3716 jio_fprintf(defaultStream::error_stream(), 3717 "Could not open options file '%s'\n", 3718 file_name); 3719 return JNI_ERR; 3720 } 3721 3722 struct stat stbuf; 3723 int retcode = os::stat(file_name, &stbuf); 3724 if (retcode != 0) { 3725 jio_fprintf(defaultStream::error_stream(), 3726 "Could not stat options file '%s'\n", 3727 file_name); 3728 os::close(fd); 3729 return JNI_ERR; 3730 } 3731 3732 if (stbuf.st_size == 0) { 3733 // tell caller there is no option data and that is ok 3734 os::close(fd); 3735 return JNI_OK; 3736 } 3737 3738 // '+ 1' for NULL termination even with max bytes 3739 size_t bytes_alloc = stbuf.st_size + 1; 3740 3741 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal); 3742 if (NULL == buf) { 3743 jio_fprintf(defaultStream::error_stream(), 3744 "Could not allocate read buffer for options file parse\n"); 3745 os::close(fd); 3746 return JNI_ENOMEM; 3747 } 3748 3749 memset(buf, 0, bytes_alloc); 3750 3751 // Fill buffer 3752 // Use ::read() instead of os::read because os::read() 3753 // might do a thread state transition 3754 // and it is too early for that here 3755 3756 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3757 os::close(fd); 3758 if (bytes_read < 0) { 3759 FREE_C_HEAP_ARRAY(char, buf); 3760 jio_fprintf(defaultStream::error_stream(), 3761 "Could not read options file '%s'\n", file_name); 3762 return JNI_ERR; 3763 } 3764 3765 if (bytes_read == 0) { 3766 // tell caller there is no option data and that is ok 3767 FREE_C_HEAP_ARRAY(char, buf); 3768 return JNI_OK; 3769 } 3770 3771 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3772 3773 FREE_C_HEAP_ARRAY(char, buf); 3774 return retcode; 3775 } 3776 3777 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3778 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3779 3780 // some pointers to help with parsing 3781 char *buffer_end = buffer + buf_len; 3782 char *opt_hd = buffer; 3783 char *wrt = buffer; 3784 char *rd = buffer; 3785 3786 // parse all options 3787 while (rd < buffer_end) { 3788 // skip leading white space from the input string 3789 while (rd < buffer_end && isspace(*rd)) { 3790 rd++; 3791 } 3792 3793 if (rd >= buffer_end) { 3794 break; 3795 } 3796 3797 // Remember this is where we found the head of the token. 3798 opt_hd = wrt; 3799 3800 // Tokens are strings of non white space characters separated 3801 // by one or more white spaces. 3802 while (rd < buffer_end && !isspace(*rd)) { 3803 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3804 int quote = *rd; // matching quote to look for 3805 rd++; // don't copy open quote 3806 while (rd < buffer_end && *rd != quote) { 3807 // include everything (even spaces) 3808 // up until the close quote 3809 *wrt++ = *rd++; // copy to option string 3810 } 3811 3812 if (rd < buffer_end) { 3813 rd++; // don't copy close quote 3814 } else { 3815 // did not see closing quote 3816 jio_fprintf(defaultStream::error_stream(), 3817 "Unmatched quote in %s\n", name); 3818 delete options; 3819 return JNI_ERR; 3820 } 3821 } else { 3822 *wrt++ = *rd++; // copy to option string 3823 } 3824 } 3825 3826 // steal a white space character and set it to NULL 3827 *wrt++ = '\0'; 3828 // We now have a complete token 3829 3830 JavaVMOption option; 3831 option.optionString = opt_hd; 3832 option.extraInfo = NULL; 3833 3834 options->append(option); // Fill in option 3835 3836 rd++; // Advance to next character 3837 } 3838 3839 // Fill out JavaVMInitArgs structure. 3840 jint status = vm_args->set_args(options); 3841 3842 delete options; 3843 return status; 3844 } 3845 3846 void Arguments::set_shared_spaces_flags() { 3847 if (DumpSharedSpaces) { 3848 if (RequireSharedSpaces) { 3849 warning("Cannot dump shared archive while using shared archive"); 3850 } 3851 UseSharedSpaces = false; 3852 #ifdef _LP64 3853 if (!UseCompressedOops || !UseCompressedClassPointers) { 3854 vm_exit_during_initialization( 3855 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3856 } 3857 } else { 3858 if (!UseCompressedOops || !UseCompressedClassPointers) { 3859 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3860 } 3861 #endif 3862 } 3863 } 3864 3865 #if !INCLUDE_ALL_GCS 3866 static void force_serial_gc() { 3867 FLAG_SET_DEFAULT(UseSerialGC, true); 3868 UNSUPPORTED_GC_OPTION(UseG1GC); 3869 UNSUPPORTED_GC_OPTION(UseParallelGC); 3870 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3871 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3872 UNSUPPORTED_GC_OPTION(UseParNewGC); 3873 } 3874 #endif // INCLUDE_ALL_GCS 3875 3876 // Sharing support 3877 // Construct the path to the archive 3878 static char* get_shared_archive_path() { 3879 char *shared_archive_path; 3880 if (SharedArchiveFile == NULL) { 3881 char jvm_path[JVM_MAXPATHLEN]; 3882 os::jvm_path(jvm_path, sizeof(jvm_path)); 3883 char *end = strrchr(jvm_path, *os::file_separator()); 3884 if (end != NULL) *end = '\0'; 3885 size_t jvm_path_len = strlen(jvm_path); 3886 size_t file_sep_len = strlen(os::file_separator()); 3887 const size_t len = jvm_path_len + file_sep_len + 20; 3888 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3889 if (shared_archive_path != NULL) { 3890 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3891 jvm_path, os::file_separator()); 3892 } 3893 } else { 3894 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 3895 } 3896 return shared_archive_path; 3897 } 3898 3899 #ifndef PRODUCT 3900 // Determine whether LogVMOutput should be implicitly turned on. 3901 static bool use_vm_log() { 3902 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3903 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3904 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3905 PrintAssembly || TraceDeoptimization || TraceDependencies || 3906 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3907 return true; 3908 } 3909 3910 #ifdef COMPILER1 3911 if (PrintC1Statistics) { 3912 return true; 3913 } 3914 #endif // COMPILER1 3915 3916 #ifdef COMPILER2 3917 if (PrintOptoAssembly || PrintOptoStatistics) { 3918 return true; 3919 } 3920 #endif // COMPILER2 3921 3922 return false; 3923 } 3924 3925 #endif // PRODUCT 3926 3927 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3928 char** flags_file, 3929 char** vm_options_file, 3930 const int vm_options_file_pos, 3931 ScopedVMInitArgs *vm_options_file_args, 3932 ScopedVMInitArgs* args_out) { 3933 jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args); 3934 if (code != JNI_OK) { 3935 return code; 3936 } 3937 3938 if (vm_options_file_args->get()->nOptions < 1) { 3939 return JNI_OK; 3940 } 3941 3942 return args_out->insert(args, vm_options_file_args->get(), 3943 vm_options_file_pos); 3944 } 3945 3946 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3947 char ** flags_file, 3948 char ** vm_options_file, 3949 ScopedVMInitArgs* vm_options_file_args, 3950 ScopedVMInitArgs* args_out) { 3951 // Remaining part of option string 3952 const char* tail; 3953 int vm_options_file_pos = -1; 3954 3955 for (int index = 0; index < args->nOptions; index++) { 3956 const JavaVMOption* option = args->options + index; 3957 if (ArgumentsExt::process_options(option)) { 3958 continue; 3959 } 3960 if (match_option(option, "-XX:Flags=", &tail)) { 3961 *flags_file = (char *) tail; 3962 if (*flags_file == NULL) { 3963 jio_fprintf(defaultStream::error_stream(), 3964 "Cannot copy flags_file name.\n"); 3965 return JNI_ENOMEM; 3966 } 3967 continue; 3968 } 3969 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3970 if (vm_options_file != NULL) { 3971 // The caller accepts -XX:VMOptionsFile 3972 if (*vm_options_file != NULL) { 3973 jio_fprintf(defaultStream::error_stream(), 3974 "The VM Options file can only be specified once and " 3975 "only on the command line.\n"); 3976 return JNI_EINVAL; 3977 } 3978 3979 *vm_options_file = (char *) tail; 3980 vm_options_file_pos = index; // save position of -XX:VMOptionsFile 3981 // If there's a VMOptionsFile, parse that (also can set flags_file) 3982 jint code = insert_vm_options_file(args, flags_file, vm_options_file, 3983 vm_options_file_pos, 3984 vm_options_file_args, args_out); 3985 if (code != JNI_OK) { 3986 return code; 3987 } 3988 if (args_out->is_set()) { 3989 // The VMOptions file inserted some options so switch 'args' 3990 // to the new set of options, and continue processing which 3991 // preserves "last option wins" semantics. 3992 args = args_out->get(); 3993 // The first option from the VMOptionsFile replaces the 3994 // current option. So we back track to process the 3995 // replacement option. 3996 index--; 3997 } 3998 } else { 3999 jio_fprintf(defaultStream::error_stream(), 4000 "VM options file is only supported on the command line\n"); 4001 return JNI_EINVAL; 4002 } 4003 continue; 4004 } 4005 if (match_option(option, "-XX:+PrintVMOptions")) { 4006 PrintVMOptions = true; 4007 continue; 4008 } 4009 if (match_option(option, "-XX:-PrintVMOptions")) { 4010 PrintVMOptions = false; 4011 continue; 4012 } 4013 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4014 IgnoreUnrecognizedVMOptions = true; 4015 continue; 4016 } 4017 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4018 IgnoreUnrecognizedVMOptions = false; 4019 continue; 4020 } 4021 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4022 CommandLineFlags::printFlags(tty, false); 4023 vm_exit(0); 4024 } 4025 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4026 #if INCLUDE_NMT 4027 // The launcher did not setup nmt environment variable properly. 4028 if (!MemTracker::check_launcher_nmt_support(tail)) { 4029 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4030 } 4031 4032 // Verify if nmt option is valid. 4033 if (MemTracker::verify_nmt_option()) { 4034 // Late initialization, still in single-threaded mode. 4035 if (MemTracker::tracking_level() >= NMT_summary) { 4036 MemTracker::init(); 4037 } 4038 } else { 4039 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4040 } 4041 continue; 4042 #else 4043 jio_fprintf(defaultStream::error_stream(), 4044 "Native Memory Tracking is not supported in this VM\n"); 4045 return JNI_ERR; 4046 #endif 4047 } 4048 4049 #ifndef PRODUCT 4050 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4051 CommandLineFlags::printFlags(tty, true); 4052 vm_exit(0); 4053 } 4054 #endif 4055 } 4056 return JNI_OK; 4057 } 4058 4059 static void print_options(const JavaVMInitArgs *args) { 4060 const char* tail; 4061 for (int index = 0; index < args->nOptions; index++) { 4062 const JavaVMOption *option = args->options + index; 4063 if (match_option(option, "-XX:", &tail)) { 4064 logOption(tail); 4065 } 4066 } 4067 } 4068 4069 // Parse entry point called from JNI_CreateJavaVM 4070 4071 jint Arguments::parse(const JavaVMInitArgs* args) { 4072 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4073 4074 // Initialize ranges and constraints 4075 CommandLineFlagRangeList::init(); 4076 CommandLineFlagConstraintList::init(); 4077 4078 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4079 const char* hotspotrc = ".hotspotrc"; 4080 char* flags_file = NULL; 4081 char* vm_options_file = NULL; 4082 bool settings_file_specified = false; 4083 bool needs_hotspotrc_warning = false; 4084 ScopedVMInitArgs java_tool_options_args; 4085 ScopedVMInitArgs java_options_args; 4086 ScopedVMInitArgs modified_cmd_line_args; 4087 // Pass in vm_options_file_args to keep memory for flags_file from being 4088 // deallocated if found in the vm options file. 4089 ScopedVMInitArgs vm_options_file_args; 4090 4091 jint code = 4092 parse_java_tool_options_environment_variable(&java_tool_options_args); 4093 if (code != JNI_OK) { 4094 return code; 4095 } 4096 4097 code = parse_java_options_environment_variable(&java_options_args); 4098 if (code != JNI_OK) { 4099 return code; 4100 } 4101 4102 code = match_special_option_and_act(java_tool_options_args.get(), 4103 &flags_file, NULL, NULL, NULL); 4104 if (code != JNI_OK) { 4105 return code; 4106 } 4107 4108 code = match_special_option_and_act(args, &flags_file, &vm_options_file, 4109 &vm_options_file_args, 4110 &modified_cmd_line_args); 4111 if (code != JNI_OK) { 4112 return code; 4113 } 4114 4115 4116 // The command line arguments have been modified to include VMOptionsFile arguments. 4117 if (modified_cmd_line_args.is_set()) { 4118 args = modified_cmd_line_args.get(); 4119 } 4120 4121 code = match_special_option_and_act(java_options_args.get(), &flags_file, 4122 NULL, NULL, NULL); 4123 if (code != JNI_OK) { 4124 return code; 4125 } 4126 4127 settings_file_specified = (flags_file != NULL); 4128 4129 if (IgnoreUnrecognizedVMOptions) { 4130 // uncast const to modify the flag args->ignoreUnrecognized 4131 *(jboolean*)(&args->ignoreUnrecognized) = true; 4132 java_tool_options_args.get()->ignoreUnrecognized = true; 4133 java_options_args.get()->ignoreUnrecognized = true; 4134 } 4135 4136 // Parse specified settings file 4137 if (settings_file_specified) { 4138 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 4139 return JNI_EINVAL; 4140 } 4141 } else { 4142 #ifdef ASSERT 4143 // Parse default .hotspotrc settings file 4144 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 4145 return JNI_EINVAL; 4146 } 4147 #else 4148 struct stat buf; 4149 if (os::stat(hotspotrc, &buf) == 0) { 4150 needs_hotspotrc_warning = true; 4151 } 4152 #endif 4153 } 4154 4155 if (PrintVMOptions) { 4156 print_options(java_tool_options_args.get()); 4157 print_options(args); 4158 print_options(java_options_args.get()); 4159 } 4160 4161 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4162 jint result = parse_vm_init_args(java_tool_options_args.get(), 4163 java_options_args.get(), 4164 args); // command line arguments 4165 4166 if (result != JNI_OK) { 4167 return result; 4168 } 4169 4170 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4171 SharedArchivePath = get_shared_archive_path(); 4172 if (SharedArchivePath == NULL) { 4173 return JNI_ENOMEM; 4174 } 4175 4176 // Set up VerifySharedSpaces 4177 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4178 VerifySharedSpaces = true; 4179 } 4180 4181 // Delay warning until here so that we've had a chance to process 4182 // the -XX:-PrintWarnings flag 4183 if (needs_hotspotrc_warning) { 4184 warning("%s file is present but has been ignored. " 4185 "Run with -XX:Flags=%s to load the file.", 4186 hotspotrc, hotspotrc); 4187 } 4188 4189 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4190 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 4191 #endif 4192 4193 ArgumentsExt::report_unsupported_options(); 4194 4195 #ifndef PRODUCT 4196 if (TraceBytecodesAt != 0) { 4197 TraceBytecodes = true; 4198 } 4199 if (CountCompiledCalls) { 4200 if (UseCounterDecay) { 4201 warning("UseCounterDecay disabled because CountCalls is set"); 4202 UseCounterDecay = false; 4203 } 4204 } 4205 #endif // PRODUCT 4206 4207 if (ScavengeRootsInCode == 0) { 4208 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4209 warning("Forcing ScavengeRootsInCode non-zero"); 4210 } 4211 ScavengeRootsInCode = 1; 4212 } 4213 4214 if (PrintGC) { 4215 warning("-XX:+PrintGC not supported in this build. Will turn it off."); 4216 PrintGC = false; 4217 } 4218 if (PrintGCDetails) { 4219 warning("-XX:+PrintGCDetails not supported in this build. Will turn it off."); 4220 PrintGCDetails = false; 4221 } 4222 4223 // Set object alignment values. 4224 set_object_alignment(); 4225 4226 #if !INCLUDE_ALL_GCS 4227 force_serial_gc(); 4228 #endif // INCLUDE_ALL_GCS 4229 #if !INCLUDE_CDS 4230 if (DumpSharedSpaces || RequireSharedSpaces) { 4231 jio_fprintf(defaultStream::error_stream(), 4232 "Shared spaces are not supported in this VM\n"); 4233 return JNI_ERR; 4234 } 4235 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4236 warning("Shared spaces are not supported in this VM"); 4237 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4238 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4239 } 4240 no_shared_spaces("CDS Disabled"); 4241 #endif // INCLUDE_CDS 4242 4243 return JNI_OK; 4244 } 4245 4246 jint Arguments::apply_ergo() { 4247 4248 // Set flags based on ergonomics. 4249 set_ergonomics_flags(); 4250 4251 set_shared_spaces_flags(); 4252 4253 // Check the GC selections again. 4254 if (!check_gc_consistency()) { 4255 return JNI_EINVAL; 4256 } 4257 4258 if (TieredCompilation) { 4259 set_tiered_flags(); 4260 } else { 4261 int max_compilation_policy_choice = 1; 4262 #ifdef COMPILER2 4263 max_compilation_policy_choice = 2; 4264 #endif 4265 // Check if the policy is valid. 4266 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4267 vm_exit_during_initialization( 4268 "Incompatible compilation policy selected", NULL); 4269 } 4270 // Scale CompileThreshold 4271 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4272 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4273 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4274 } 4275 } 4276 4277 #ifdef COMPILER2 4278 #ifndef PRODUCT 4279 if (PrintIdealGraphLevel > 0) { 4280 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4281 } 4282 #endif 4283 #endif 4284 4285 // Set heap size based on available physical memory 4286 set_heap_size(); 4287 4288 ArgumentsExt::set_gc_specific_flags(); 4289 4290 // Initialize Metaspace flags and alignments 4291 Metaspace::ergo_initialize(); 4292 4293 // Set bytecode rewriting flags 4294 set_bytecode_flags(); 4295 4296 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4297 jint code = set_aggressive_opts_flags(); 4298 if (code != JNI_OK) { 4299 return code; 4300 } 4301 4302 // Turn off biased locking for locking debug mode flags, 4303 // which are subtly different from each other but neither works with 4304 // biased locking 4305 if (UseHeavyMonitors 4306 #ifdef COMPILER1 4307 || !UseFastLocking 4308 #endif // COMPILER1 4309 #if INCLUDE_JVMCI 4310 || !JVMCIUseFastLocking 4311 #endif 4312 ) { 4313 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4314 // flag set to true on command line; warn the user that they 4315 // can't enable biased locking here 4316 warning("Biased Locking is not supported with locking debug flags" 4317 "; ignoring UseBiasedLocking flag." ); 4318 } 4319 UseBiasedLocking = false; 4320 } 4321 4322 #ifdef ZERO 4323 // Clear flags not supported on zero. 4324 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4325 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4326 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4327 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4328 #endif // CC_INTERP 4329 4330 #ifdef COMPILER2 4331 if (!EliminateLocks) { 4332 EliminateNestedLocks = false; 4333 } 4334 if (!Inline) { 4335 IncrementalInline = false; 4336 } 4337 #ifndef PRODUCT 4338 if (!IncrementalInline) { 4339 AlwaysIncrementalInline = false; 4340 } 4341 #endif 4342 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4343 // nothing to use the profiling, turn if off 4344 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4345 } 4346 #endif 4347 4348 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4349 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4350 DebugNonSafepoints = true; 4351 } 4352 4353 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4354 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4355 } 4356 4357 #ifndef PRODUCT 4358 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4359 if (use_vm_log()) { 4360 LogVMOutput = true; 4361 } 4362 } 4363 #endif // PRODUCT 4364 4365 if (PrintCommandLineFlags) { 4366 CommandLineFlags::printSetFlags(tty); 4367 } 4368 4369 // Apply CPU specific policy for the BiasedLocking 4370 if (UseBiasedLocking) { 4371 if (!VM_Version::use_biased_locking() && 4372 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4373 UseBiasedLocking = false; 4374 } 4375 } 4376 #ifdef COMPILER2 4377 if (!UseBiasedLocking || EmitSync != 0) { 4378 UseOptoBiasInlining = false; 4379 } 4380 #endif 4381 4382 return JNI_OK; 4383 } 4384 4385 jint Arguments::adjust_after_os() { 4386 if (UseNUMA) { 4387 if (UseParallelGC || UseParallelOldGC) { 4388 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4389 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4390 } 4391 } 4392 // UseNUMAInterleaving is set to ON for all collectors and 4393 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4394 // such as the parallel collector for Linux and Solaris will 4395 // interleave old gen and survivor spaces on top of NUMA 4396 // allocation policy for the eden space. 4397 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4398 // all platforms and ParallelGC on Windows will interleave all 4399 // of the heap spaces across NUMA nodes. 4400 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4401 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4402 } 4403 } 4404 return JNI_OK; 4405 } 4406 4407 int Arguments::PropertyList_count(SystemProperty* pl) { 4408 int count = 0; 4409 while(pl != NULL) { 4410 count++; 4411 pl = pl->next(); 4412 } 4413 return count; 4414 } 4415 4416 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4417 assert(key != NULL, "just checking"); 4418 SystemProperty* prop; 4419 for (prop = pl; prop != NULL; prop = prop->next()) { 4420 if (strcmp(key, prop->key()) == 0) return prop->value(); 4421 } 4422 return NULL; 4423 } 4424 4425 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4426 int count = 0; 4427 const char* ret_val = NULL; 4428 4429 while(pl != NULL) { 4430 if(count >= index) { 4431 ret_val = pl->key(); 4432 break; 4433 } 4434 count++; 4435 pl = pl->next(); 4436 } 4437 4438 return ret_val; 4439 } 4440 4441 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4442 int count = 0; 4443 char* ret_val = NULL; 4444 4445 while(pl != NULL) { 4446 if(count >= index) { 4447 ret_val = pl->value(); 4448 break; 4449 } 4450 count++; 4451 pl = pl->next(); 4452 } 4453 4454 return ret_val; 4455 } 4456 4457 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4458 SystemProperty* p = *plist; 4459 if (p == NULL) { 4460 *plist = new_p; 4461 } else { 4462 while (p->next() != NULL) { 4463 p = p->next(); 4464 } 4465 p->set_next(new_p); 4466 } 4467 } 4468 4469 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) { 4470 if (plist == NULL) 4471 return; 4472 4473 SystemProperty* new_p = new SystemProperty(k, v, true); 4474 PropertyList_add(plist, new_p); 4475 } 4476 4477 void Arguments::PropertyList_add(SystemProperty *element) { 4478 PropertyList_add(&_system_properties, element); 4479 } 4480 4481 // This add maintains unique property key in the list. 4482 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) { 4483 if (plist == NULL) 4484 return; 4485 4486 // If property key exist then update with new value. 4487 SystemProperty* prop; 4488 for (prop = *plist; prop != NULL; prop = prop->next()) { 4489 if (strcmp(k, prop->key()) == 0) { 4490 if (append) { 4491 prop->append_value(v); 4492 } else { 4493 prop->set_value(v); 4494 } 4495 return; 4496 } 4497 } 4498 4499 PropertyList_add(plist, k, v); 4500 } 4501 4502 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4503 // Returns true if all of the source pointed by src has been copied over to 4504 // the destination buffer pointed by buf. Otherwise, returns false. 4505 // Notes: 4506 // 1. If the length (buflen) of the destination buffer excluding the 4507 // NULL terminator character is not long enough for holding the expanded 4508 // pid characters, it also returns false instead of returning the partially 4509 // expanded one. 4510 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4511 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4512 char* buf, size_t buflen) { 4513 const char* p = src; 4514 char* b = buf; 4515 const char* src_end = &src[srclen]; 4516 char* buf_end = &buf[buflen - 1]; 4517 4518 while (p < src_end && b < buf_end) { 4519 if (*p == '%') { 4520 switch (*(++p)) { 4521 case '%': // "%%" ==> "%" 4522 *b++ = *p++; 4523 break; 4524 case 'p': { // "%p" ==> current process id 4525 // buf_end points to the character before the last character so 4526 // that we could write '\0' to the end of the buffer. 4527 size_t buf_sz = buf_end - b + 1; 4528 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4529 4530 // if jio_snprintf fails or the buffer is not long enough to hold 4531 // the expanded pid, returns false. 4532 if (ret < 0 || ret >= (int)buf_sz) { 4533 return false; 4534 } else { 4535 b += ret; 4536 assert(*b == '\0', "fail in copy_expand_pid"); 4537 if (p == src_end && b == buf_end + 1) { 4538 // reach the end of the buffer. 4539 return true; 4540 } 4541 } 4542 p++; 4543 break; 4544 } 4545 default : 4546 *b++ = '%'; 4547 } 4548 } else { 4549 *b++ = *p++; 4550 } 4551 } 4552 *b = '\0'; 4553 return (p == src_end); // return false if not all of the source was copied 4554 }