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