1 /* 2 * Copyright (c) 1997, 2017, 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 "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/javaAssertions.hpp" 29 #include "classfile/moduleEntry.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "gc/shared/gcArguments.hpp" 33 #include "gc/shared/genCollectedHeap.hpp" 34 #include "gc/shared/referenceProcessor.hpp" 35 #include "gc/shared/taskqueue.hpp" 36 #include "logging/log.hpp" 37 #include "logging/logConfiguration.hpp" 38 #include "logging/logStream.hpp" 39 #include "logging/logTag.hpp" 40 #include "memory/allocation.inline.hpp" 41 #include "memory/universe.inline.hpp" 42 #include "oops/oop.inline.hpp" 43 #include "prims/jvmtiExport.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/arguments_ext.hpp" 46 #include "runtime/commandLineFlagConstraintList.hpp" 47 #include "runtime/commandLineFlagWriteableList.hpp" 48 #include "runtime/commandLineFlagRangeList.hpp" 49 #include "runtime/globals.hpp" 50 #include "runtime/globals_extension.hpp" 51 #include "runtime/java.hpp" 52 #include "runtime/os.hpp" 53 #include "runtime/safepointMechanism.hpp" 54 #include "runtime/vm_version.hpp" 55 #include "services/management.hpp" 56 #include "services/memTracker.hpp" 57 #include "utilities/align.hpp" 58 #include "utilities/defaultStream.hpp" 59 #include "utilities/macros.hpp" 60 #include "utilities/stringUtils.hpp" 61 #if INCLUDE_JVMCI 62 #include "jvmci/jvmciRuntime.hpp" 63 #endif 64 65 // Note: This is a special bug reporting site for the JVM 66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 67 #define DEFAULT_JAVA_LAUNCHER "generic" 68 69 char* Arguments::_jvm_flags_file = NULL; 70 char** Arguments::_jvm_flags_array = NULL; 71 int Arguments::_num_jvm_flags = 0; 72 char** Arguments::_jvm_args_array = NULL; 73 int Arguments::_num_jvm_args = 0; 74 char* Arguments::_java_command = NULL; 75 SystemProperty* Arguments::_system_properties = NULL; 76 const char* Arguments::_gc_log_filename = NULL; 77 size_t Arguments::_conservative_max_heap_alignment = 0; 78 size_t Arguments::_min_heap_size = 0; 79 Arguments::Mode Arguments::_mode = _mixed; 80 bool Arguments::_java_compiler = false; 81 bool Arguments::_xdebug_mode = false; 82 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 83 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 84 int Arguments::_sun_java_launcher_pid = -1; 85 bool Arguments::_sun_java_launcher_is_altjvm = false; 86 87 // These parameters are reset in method parse_vm_init_args() 88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 90 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 91 bool Arguments::_ClipInlining = ClipInlining; 92 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 93 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 94 95 char* Arguments::SharedArchivePath = NULL; 96 97 AgentLibraryList Arguments::_libraryList; 98 AgentLibraryList Arguments::_agentList; 99 100 abort_hook_t Arguments::_abort_hook = NULL; 101 exit_hook_t Arguments::_exit_hook = NULL; 102 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 103 104 105 SystemProperty *Arguments::_sun_boot_library_path = NULL; 106 SystemProperty *Arguments::_java_library_path = NULL; 107 SystemProperty *Arguments::_java_home = NULL; 108 SystemProperty *Arguments::_java_class_path = NULL; 109 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 110 111 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 112 PathString *Arguments::_system_boot_class_path = NULL; 113 bool Arguments::_has_jimage = false; 114 115 char* Arguments::_ext_dirs = NULL; 116 117 bool PathString::set_value(const char *value) { 118 if (_value != NULL) { 119 FreeHeap(_value); 120 } 121 _value = AllocateHeap(strlen(value)+1, mtArguments); 122 assert(_value != NULL, "Unable to allocate space for new path value"); 123 if (_value != NULL) { 124 strcpy(_value, value); 125 } else { 126 // not able to allocate 127 return false; 128 } 129 return true; 130 } 131 132 void PathString::append_value(const char *value) { 133 char *sp; 134 size_t len = 0; 135 if (value != NULL) { 136 len = strlen(value); 137 if (_value != NULL) { 138 len += strlen(_value); 139 } 140 sp = AllocateHeap(len+2, mtArguments); 141 assert(sp != NULL, "Unable to allocate space for new append path value"); 142 if (sp != NULL) { 143 if (_value != NULL) { 144 strcpy(sp, _value); 145 strcat(sp, os::path_separator()); 146 strcat(sp, value); 147 FreeHeap(_value); 148 } else { 149 strcpy(sp, value); 150 } 151 _value = sp; 152 } 153 } 154 } 155 156 PathString::PathString(const char* value) { 157 if (value == NULL) { 158 _value = NULL; 159 } else { 160 _value = AllocateHeap(strlen(value)+1, mtArguments); 161 strcpy(_value, value); 162 } 163 } 164 165 PathString::~PathString() { 166 if (_value != NULL) { 167 FreeHeap(_value); 168 _value = NULL; 169 } 170 } 171 172 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 173 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 174 size_t len = strlen(module_name) + 1; 175 _module_name = AllocateHeap(len, mtInternal); 176 strncpy(_module_name, module_name, len); // copy the trailing null 177 _path = new PathString(path); 178 } 179 180 ModulePatchPath::~ModulePatchPath() { 181 if (_module_name != NULL) { 182 FreeHeap(_module_name); 183 _module_name = NULL; 184 } 185 if (_path != NULL) { 186 delete _path; 187 _path = NULL; 188 } 189 } 190 191 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 192 if (key == NULL) { 193 _key = NULL; 194 } else { 195 _key = AllocateHeap(strlen(key)+1, mtArguments); 196 strcpy(_key, key); 197 } 198 _next = NULL; 199 _internal = internal; 200 _writeable = writeable; 201 } 202 203 AgentLibrary::AgentLibrary(const char* name, const char* options, bool is_absolute_path, void* os_lib) { 204 _name = AllocateHeap(strlen(name)+1, mtArguments); 205 strcpy(_name, name); 206 if (options == NULL) { 207 _options = NULL; 208 } else { 209 _options = AllocateHeap(strlen(options)+1, mtArguments); 210 strcpy(_options, options); 211 } 212 _is_absolute_path = is_absolute_path; 213 _os_lib = os_lib; 214 _next = NULL; 215 _state = agent_invalid; 216 _is_static_lib = false; 217 } 218 219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 220 // part of the option string. 221 static bool match_option(const JavaVMOption *option, const char* name, 222 const char** tail) { 223 size_t len = strlen(name); 224 if (strncmp(option->optionString, name, len) == 0) { 225 *tail = option->optionString + len; 226 return true; 227 } else { 228 return false; 229 } 230 } 231 232 // Check if 'option' matches 'name'. No "tail" is allowed. 233 static bool match_option(const JavaVMOption *option, const char* name) { 234 const char* tail = NULL; 235 bool result = match_option(option, name, &tail); 236 if (tail != NULL && *tail == '\0') { 237 return result; 238 } else { 239 return false; 240 } 241 } 242 243 // Return true if any of the strings in null-terminated array 'names' matches. 244 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 245 // the option must match exactly. 246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 247 bool tail_allowed) { 248 for (/* empty */; *names != NULL; ++names) { 249 if (match_option(option, *names, tail)) { 250 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 251 return true; 252 } 253 } 254 } 255 return false; 256 } 257 258 static void logOption(const char* opt) { 259 if (PrintVMOptions) { 260 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 261 } 262 } 263 264 bool needs_module_property_warning = false; 265 266 #define MODULE_PROPERTY_PREFIX "jdk.module." 267 #define MODULE_PROPERTY_PREFIX_LEN 11 268 #define ADDEXPORTS "addexports" 269 #define ADDEXPORTS_LEN 10 270 #define ADDREADS "addreads" 271 #define ADDREADS_LEN 8 272 #define ADDOPENS "addopens" 273 #define ADDOPENS_LEN 8 274 #define PATCH "patch" 275 #define PATCH_LEN 5 276 #define ADDMODS "addmods" 277 #define ADDMODS_LEN 7 278 #define LIMITMODS "limitmods" 279 #define LIMITMODS_LEN 9 280 #define PATH "path" 281 #define PATH_LEN 4 282 #define UPGRADE_PATH "upgrade.path" 283 #define UPGRADE_PATH_LEN 12 284 285 void Arguments::add_init_library(const char* name, char* options) { 286 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 287 } 288 289 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 290 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 291 } 292 293 // Late-binding agents not started via arguments 294 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 295 _agentList.add(agentLib); 296 } 297 298 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) { 299 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib)); 300 } 301 302 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 303 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 304 return ((strncmp(option, property, len) == 0) && 305 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 306 } 307 308 // Return true if property starts with "jdk.module." and its ensuing chars match 309 // any of the reserved module properties. 310 // property should be passed without the leading "-D". 311 bool Arguments::is_internal_module_property(const char* property) { 312 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 313 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 314 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 315 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 316 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 317 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 318 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 319 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 320 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 321 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 322 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 323 return true; 324 } 325 } 326 return false; 327 } 328 329 // Process java launcher properties. 330 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 331 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 332 // sun.java.launcher.pid is defined. 333 // Must do this before setting up other system properties, 334 // as some of them may depend on launcher type. 335 for (int index = 0; index < args->nOptions; index++) { 336 const JavaVMOption* option = args->options + index; 337 const char* tail; 338 339 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 340 process_java_launcher_argument(tail, option->extraInfo); 341 continue; 342 } 343 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 344 if (strcmp(tail, "true") == 0) { 345 _sun_java_launcher_is_altjvm = true; 346 } 347 continue; 348 } 349 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 350 _sun_java_launcher_pid = atoi(tail); 351 continue; 352 } 353 } 354 } 355 356 // Initialize system properties key and value. 357 void Arguments::init_system_properties() { 358 359 // Set up _system_boot_class_path which is not a property but 360 // relies heavily on argument processing and the jdk.boot.class.path.append 361 // property. It is used to store the underlying system boot class path. 362 _system_boot_class_path = new PathString(NULL); 363 364 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 365 "Java Virtual Machine Specification", false)); 366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 367 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 369 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 370 371 // Following are JVMTI agent writable properties. 372 // Properties values are set to NULL and they are 373 // os specific they are initialized in os::init_system_properties_values(). 374 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 375 _java_library_path = new SystemProperty("java.library.path", NULL, true); 376 _java_home = new SystemProperty("java.home", NULL, true); 377 _java_class_path = new SystemProperty("java.class.path", "", true); 378 // jdk.boot.class.path.append is a non-writeable, internal property. 379 // It can only be set by either: 380 // - -Xbootclasspath/a: 381 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 382 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 383 384 // Add to System Property list. 385 PropertyList_add(&_system_properties, _sun_boot_library_path); 386 PropertyList_add(&_system_properties, _java_library_path); 387 PropertyList_add(&_system_properties, _java_home); 388 PropertyList_add(&_system_properties, _java_class_path); 389 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 390 391 // Set OS specific system properties values 392 os::init_system_properties_values(); 393 } 394 395 // Update/Initialize System properties after JDK version number is known 396 void Arguments::init_version_specific_system_properties() { 397 enum { bufsz = 16 }; 398 char buffer[bufsz]; 399 const char* spec_vendor = "Oracle Corporation"; 400 uint32_t spec_version = JDK_Version::current().major_version(); 401 402 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 403 404 PropertyList_add(&_system_properties, 405 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 406 PropertyList_add(&_system_properties, 407 new SystemProperty("java.vm.specification.version", buffer, false)); 408 PropertyList_add(&_system_properties, 409 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 410 } 411 412 /* 413 * -XX argument processing: 414 * 415 * -XX arguments are defined in several places, such as: 416 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 417 * -XX arguments are parsed in parse_argument(). 418 * -XX argument bounds checking is done in check_vm_args_consistency(). 419 * 420 * Over time -XX arguments may change. There are mechanisms to handle common cases: 421 * 422 * ALIASED: An option that is simply another name for another option. This is often 423 * part of the process of deprecating a flag, but not all aliases need 424 * to be deprecated. 425 * 426 * Create an alias for an option by adding the old and new option names to the 427 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 428 * 429 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 430 * support may be removed in the future. Both regular and aliased options may be 431 * deprecated. 432 * 433 * Add a deprecation warning for an option (or alias) by adding an entry in the 434 * "special_jvm_flags" table and setting the "deprecated_in" field. 435 * Often an option "deprecated" in one major release will 436 * be made "obsolete" in the next. In this case the entry should also have its 437 * "obsolete_in" field set. 438 * 439 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 440 * on the command line. A warning is printed to let the user know that option might not 441 * be accepted in the future. 442 * 443 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 444 * table and setting the "obsolete_in" field. 445 * 446 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 447 * to the current JDK version. The system will flatly refuse to admit the existence of 448 * the flag. This allows a flag to die automatically over JDK releases. 449 * 450 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 451 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 452 * - Newly obsolete or expired deprecated options should have their global variable 453 * definitions removed (from globals.hpp, etc) and related implementations removed. 454 * 455 * Recommended approach for removing options: 456 * 457 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 458 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 459 * 460 * To remove internal options (e.g. diagnostic, experimental, develop options), use 461 * a 2-step model adding major release numbers to the obsolete and expire columns. 462 * 463 * To change the name of an option, use the alias table as well as a 2-step 464 * model adding major release numbers to the deprecate and expire columns. 465 * Think twice about aliasing commonly used customer options. 466 * 467 * There are times when it is appropriate to leave a future release number as undefined. 468 * 469 * Tests: Aliases should be tested in VMAliasOptions.java. 470 * Deprecated options should be tested in VMDeprecatedOptions.java. 471 */ 472 473 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 474 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 475 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 476 // the command-line as usual, but will issue a warning. 477 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 478 // the command-line, while issuing a warning and ignoring the flag value. 479 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 480 // existence of the flag. 481 // 482 // MANUAL CLEANUP ON JDK VERSION UPDATES: 483 // This table ensures that the handling of options will update automatically when the JDK 484 // version is incremented, but the source code needs to be cleanup up manually: 485 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 486 // variable should be removed, as well as users of the variable. 487 // - As "deprecated" options age into "obsolete" options, move the entry into the 488 // "Obsolete Flags" section of the table. 489 // - All expired options should be removed from the table. 490 static SpecialFlag const special_jvm_flags[] = { 491 // -------------- Deprecated Flags -------------- 492 // --- Non-alias flags - sorted by obsolete_in then expired_in: 493 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 494 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 495 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() }, 496 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() }, 497 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 498 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 499 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 500 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 501 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 502 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 503 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 504 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 505 { "UseCGroupMemoryLimitForHeap", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::jdk(11) }, 506 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 507 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 508 509 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 510 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 511 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 512 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 513 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 514 515 // -------------- Obsolete Flags - sorted by expired_in -------------- 516 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 517 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 518 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 519 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 520 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 521 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 522 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 523 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 524 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 525 526 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 527 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 528 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 529 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 530 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 531 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 532 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 533 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 534 #endif 535 536 { NULL, JDK_Version(0), JDK_Version(0) } 537 }; 538 539 // Flags that are aliases for other flags. 540 typedef struct { 541 const char* alias_name; 542 const char* real_name; 543 } AliasedFlag; 544 545 static AliasedFlag const aliased_jvm_flags[] = { 546 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 547 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 548 { NULL, NULL} 549 }; 550 551 // NOTE: A compatibility request will be necessary for each alias to be removed. 552 static AliasedLoggingFlag const aliased_logging_flags[] = { 553 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 554 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 555 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 556 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 557 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 558 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 559 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 560 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 561 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 562 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 563 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 564 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 565 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 566 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 567 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 568 }; 569 570 #ifndef PRODUCT 571 // These options are removed in jdk9. Remove this code for jdk10. 572 static AliasedFlag const removed_develop_logging_flags[] = { 573 { "TraceClassInitialization", "-Xlog:class+init" }, 574 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 575 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 576 { "TraceItables", "-Xlog:itables=debug" }, 577 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 578 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 579 { "TraceStartupTime", "-Xlog:startuptime" }, 580 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 581 { "PrintVtables", "-Xlog:vtables=debug" }, 582 { "VerboseVerification", "-Xlog:verification" }, 583 { NULL, NULL } 584 }; 585 #endif //PRODUCT 586 587 // Return true if "v" is less than "other", where "other" may be "undefined". 588 static bool version_less_than(JDK_Version v, JDK_Version other) { 589 assert(!v.is_undefined(), "must be defined"); 590 if (!other.is_undefined() && v.compare(other) >= 0) { 591 return false; 592 } else { 593 return true; 594 } 595 } 596 597 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 598 599 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 600 // Allow extensions to have priority 601 if (lookup_special_flag_ext(flag_name, flag)) { 602 return true; 603 } 604 605 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 606 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 607 flag = special_jvm_flags[i]; 608 return true; 609 } 610 } 611 return false; 612 } 613 614 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 615 assert(version != NULL, "Must provide a version buffer"); 616 SpecialFlag flag; 617 if (lookup_special_flag(flag_name, flag)) { 618 if (!flag.obsolete_in.is_undefined()) { 619 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 620 *version = flag.obsolete_in; 621 return true; 622 } 623 } 624 } 625 return false; 626 } 627 628 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 629 assert(version != NULL, "Must provide a version buffer"); 630 SpecialFlag flag; 631 if (lookup_special_flag(flag_name, flag)) { 632 if (!flag.deprecated_in.is_undefined()) { 633 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 634 version_less_than(JDK_Version::current(), flag.expired_in)) { 635 *version = flag.deprecated_in; 636 return 1; 637 } else { 638 return -1; 639 } 640 } 641 } 642 return 0; 643 } 644 645 #ifndef PRODUCT 646 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 647 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 648 const AliasedFlag& flag = removed_develop_logging_flags[i]; 649 if (strcmp(flag.alias_name, name) == 0) { 650 return flag.real_name; 651 } 652 } 653 return NULL; 654 } 655 #endif // PRODUCT 656 657 const char* Arguments::real_flag_name(const char *flag_name) { 658 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 659 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 660 if (strcmp(flag_status.alias_name, flag_name) == 0) { 661 return flag_status.real_name; 662 } 663 } 664 return flag_name; 665 } 666 667 #ifdef ASSERT 668 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 669 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 670 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 671 return true; 672 } 673 } 674 return false; 675 } 676 677 static bool verify_special_jvm_flags() { 678 bool success = true; 679 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 680 const SpecialFlag& flag = special_jvm_flags[i]; 681 if (lookup_special_flag(flag.name, i)) { 682 warning("Duplicate special flag declaration \"%s\"", flag.name); 683 success = false; 684 } 685 if (flag.deprecated_in.is_undefined() && 686 flag.obsolete_in.is_undefined()) { 687 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 688 success = false; 689 } 690 691 if (!flag.deprecated_in.is_undefined()) { 692 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 693 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 694 success = false; 695 } 696 697 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 698 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 699 success = false; 700 } 701 } 702 703 if (!flag.obsolete_in.is_undefined()) { 704 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 705 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 706 success = false; 707 } 708 709 // if flag has become obsolete it should not have a "globals" flag defined anymore. 710 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 711 if (Flag::find_flag(flag.name) != NULL) { 712 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 713 } 714 } 715 } 716 717 if (!flag.expired_in.is_undefined()) { 718 // if flag has become expired it should not have a "globals" flag defined anymore. 719 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 720 if (Flag::find_flag(flag.name) != NULL) { 721 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 722 } 723 } 724 } 725 726 } 727 return success; 728 } 729 #endif 730 731 // Parses a size specification string. 732 bool Arguments::atojulong(const char *s, julong* result) { 733 julong n = 0; 734 735 // First char must be a digit. Don't allow negative numbers or leading spaces. 736 if (!isdigit(*s)) { 737 return false; 738 } 739 740 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 741 char* remainder; 742 errno = 0; 743 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 744 if (errno != 0) { 745 return false; 746 } 747 748 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 749 if (remainder == s || strlen(remainder) > 1) { 750 return false; 751 } 752 753 switch (*remainder) { 754 case 'T': case 't': 755 *result = n * G * K; 756 // Check for overflow. 757 if (*result/((julong)G * K) != n) return false; 758 return true; 759 case 'G': case 'g': 760 *result = n * G; 761 if (*result/G != n) return false; 762 return true; 763 case 'M': case 'm': 764 *result = n * M; 765 if (*result/M != n) return false; 766 return true; 767 case 'K': case 'k': 768 *result = n * K; 769 if (*result/K != n) return false; 770 return true; 771 case '\0': 772 *result = n; 773 return true; 774 default: 775 return false; 776 } 777 } 778 779 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 780 if (size < min_size) return arg_too_small; 781 if (size > max_size) return arg_too_big; 782 return arg_in_range; 783 } 784 785 // Describe an argument out of range error 786 void Arguments::describe_range_error(ArgsRange errcode) { 787 switch(errcode) { 788 case arg_too_big: 789 jio_fprintf(defaultStream::error_stream(), 790 "The specified size exceeds the maximum " 791 "representable size.\n"); 792 break; 793 case arg_too_small: 794 case arg_unreadable: 795 case arg_in_range: 796 // do nothing for now 797 break; 798 default: 799 ShouldNotReachHere(); 800 } 801 } 802 803 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 804 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 805 return true; 806 } else { 807 return false; 808 } 809 } 810 811 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 812 char* end; 813 errno = 0; 814 double v = strtod(value, &end); 815 if ((errno != 0) || (*end != 0)) { 816 return false; 817 } 818 819 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 820 return true; 821 } 822 return false; 823 } 824 825 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 826 julong v; 827 int int_v; 828 intx intx_v; 829 bool is_neg = false; 830 Flag* result = Flag::find_flag(name, strlen(name)); 831 832 if (result == NULL) { 833 return false; 834 } 835 836 // Check the sign first since atojulong() parses only unsigned values. 837 if (*value == '-') { 838 if (!result->is_intx() && !result->is_int()) { 839 return false; 840 } 841 value++; 842 is_neg = true; 843 } 844 if (!Arguments::atojulong(value, &v)) { 845 return false; 846 } 847 if (result->is_int()) { 848 int_v = (int) v; 849 if (is_neg) { 850 int_v = -int_v; 851 } 852 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 853 } else if (result->is_uint()) { 854 uint uint_v = (uint) v; 855 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 856 } else if (result->is_intx()) { 857 intx_v = (intx) v; 858 if (is_neg) { 859 intx_v = -intx_v; 860 } 861 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 862 } else if (result->is_uintx()) { 863 uintx uintx_v = (uintx) v; 864 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 865 } else if (result->is_uint64_t()) { 866 uint64_t uint64_t_v = (uint64_t) v; 867 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 868 } else if (result->is_size_t()) { 869 size_t size_t_v = (size_t) v; 870 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 871 } else if (result->is_double()) { 872 double double_v = (double) v; 873 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS; 874 } else { 875 return false; 876 } 877 } 878 879 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 880 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 881 // Contract: CommandLineFlags always returns a pointer that needs freeing. 882 FREE_C_HEAP_ARRAY(char, value); 883 return true; 884 } 885 886 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 887 const char* old_value = ""; 888 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 889 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 890 size_t new_len = strlen(new_value); 891 const char* value; 892 char* free_this_too = NULL; 893 if (old_len == 0) { 894 value = new_value; 895 } else if (new_len == 0) { 896 value = old_value; 897 } else { 898 size_t length = old_len + 1 + new_len + 1; 899 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 900 // each new setting adds another LINE to the switch: 901 jio_snprintf(buf, length, "%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 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 943 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 944 // Set tagset string buffer at max size of 256, large enough for any alias tagset 945 const int max_tagset_size = 256; 946 int max_tagset_len = max_tagset_size - 1; 947 char tagset_buffer[max_tagset_size]; 948 tagset_buffer[0] = '\0'; 949 950 // Write tag-set for aliased logging option, in string list form 951 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 952 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 953 if (i > 0) { 954 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 955 } 956 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 957 } 958 if (!alf.exactMatch) { 959 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 960 } 961 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 962 (on) ? "+" : "-", 963 name, 964 tagset_buffer, 965 (on) ? LogLevel::name(alf.level) : "off"); 966 } 967 968 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 969 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 970 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 971 if (strcmp(alf.alias_name, name) == 0) { 972 log_deprecated_flag(name, on, alf); 973 return alf; 974 } 975 } 976 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 977 return a; 978 } 979 980 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 981 982 // range of acceptable characters spelled out for portability reasons 983 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 984 #define BUFLEN 255 985 char name[BUFLEN+1]; 986 char dummy; 987 const char* real_name; 988 bool warn_if_deprecated = true; 989 990 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 991 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 992 if (alf.alias_name != NULL){ 993 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 994 return true; 995 } 996 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 997 if (real_name == NULL) { 998 return false; 999 } 1000 return set_bool_flag(real_name, false, origin); 1001 } 1002 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1003 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1004 if (alf.alias_name != NULL){ 1005 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1006 return true; 1007 } 1008 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1009 if (real_name == NULL) { 1010 return false; 1011 } 1012 return set_bool_flag(real_name, true, origin); 1013 } 1014 1015 char punct; 1016 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1017 const char* value = strchr(arg, '=') + 1; 1018 Flag* flag; 1019 1020 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1021 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1022 if (alf.alias_name != NULL) { 1023 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1024 return true; 1025 } 1026 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1027 if (real_name == NULL) { 1028 return false; 1029 } 1030 flag = Flag::find_flag(real_name); 1031 if (flag != NULL && flag->is_ccstr()) { 1032 if (flag->ccstr_accumulates()) { 1033 return append_to_string_flag(real_name, value, origin); 1034 } else { 1035 if (value[0] == '\0') { 1036 value = NULL; 1037 } 1038 return set_string_flag(real_name, value, origin); 1039 } 1040 } else { 1041 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1042 } 1043 } 1044 1045 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1046 const char* value = strchr(arg, '=') + 1; 1047 // -XX:Foo:=xxx will reset the string flag to the given value. 1048 if (value[0] == '\0') { 1049 value = NULL; 1050 } 1051 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1052 if (real_name == NULL) { 1053 return false; 1054 } 1055 return set_string_flag(real_name, value, origin); 1056 } 1057 1058 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1059 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1060 #define NUMBER_RANGE "[0123456789eE+-]" 1061 char value[BUFLEN + 1]; 1062 char value2[BUFLEN + 1]; 1063 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1064 // Looks like a floating-point number -- try again with more lenient format string 1065 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1066 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1067 if (real_name == NULL) { 1068 return false; 1069 } 1070 return set_fp_numeric_flag(real_name, value, origin); 1071 } 1072 } 1073 1074 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1075 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1076 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1077 if (real_name == NULL) { 1078 return false; 1079 } 1080 return set_numeric_flag(real_name, value, origin); 1081 } 1082 1083 return false; 1084 } 1085 1086 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1087 assert(bldarray != NULL, "illegal argument"); 1088 1089 if (arg == NULL) { 1090 return; 1091 } 1092 1093 int new_count = *count + 1; 1094 1095 // expand the array and add arg to the last element 1096 if (*bldarray == NULL) { 1097 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1098 } else { 1099 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1100 } 1101 (*bldarray)[*count] = os::strdup_check_oom(arg); 1102 *count = new_count; 1103 } 1104 1105 void Arguments::build_jvm_args(const char* arg) { 1106 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1107 } 1108 1109 void Arguments::build_jvm_flags(const char* arg) { 1110 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1111 } 1112 1113 // utility function to return a string that concatenates all 1114 // strings in a given char** array 1115 const char* Arguments::build_resource_string(char** args, int count) { 1116 if (args == NULL || count == 0) { 1117 return NULL; 1118 } 1119 size_t length = 0; 1120 for (int i = 0; i < count; i++) { 1121 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1122 } 1123 char* s = NEW_RESOURCE_ARRAY(char, length); 1124 char* dst = s; 1125 for (int j = 0; j < count; j++) { 1126 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1127 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1128 dst += offset; 1129 length -= offset; 1130 } 1131 return (const char*) s; 1132 } 1133 1134 void Arguments::print_on(outputStream* st) { 1135 st->print_cr("VM Arguments:"); 1136 if (num_jvm_flags() > 0) { 1137 st->print("jvm_flags: "); print_jvm_flags_on(st); 1138 st->cr(); 1139 } 1140 if (num_jvm_args() > 0) { 1141 st->print("jvm_args: "); print_jvm_args_on(st); 1142 st->cr(); 1143 } 1144 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1145 if (_java_class_path != NULL) { 1146 char* path = _java_class_path->value(); 1147 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1148 } 1149 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1150 } 1151 1152 void Arguments::print_summary_on(outputStream* st) { 1153 // Print the command line. Environment variables that are helpful for 1154 // reproducing the problem are written later in the hs_err file. 1155 // flags are from setting file 1156 if (num_jvm_flags() > 0) { 1157 st->print_raw("Settings File: "); 1158 print_jvm_flags_on(st); 1159 st->cr(); 1160 } 1161 // args are the command line and environment variable arguments. 1162 st->print_raw("Command Line: "); 1163 if (num_jvm_args() > 0) { 1164 print_jvm_args_on(st); 1165 } 1166 // this is the classfile and any arguments to the java program 1167 if (java_command() != NULL) { 1168 st->print("%s", java_command()); 1169 } 1170 st->cr(); 1171 } 1172 1173 void Arguments::print_jvm_flags_on(outputStream* st) { 1174 if (_num_jvm_flags > 0) { 1175 for (int i=0; i < _num_jvm_flags; i++) { 1176 st->print("%s ", _jvm_flags_array[i]); 1177 } 1178 } 1179 } 1180 1181 void Arguments::print_jvm_args_on(outputStream* st) { 1182 if (_num_jvm_args > 0) { 1183 for (int i=0; i < _num_jvm_args; i++) { 1184 st->print("%s ", _jvm_args_array[i]); 1185 } 1186 } 1187 } 1188 1189 bool Arguments::process_argument(const char* arg, 1190 jboolean ignore_unrecognized, 1191 Flag::Flags origin) { 1192 JDK_Version since = JDK_Version(); 1193 1194 if (parse_argument(arg, origin)) { 1195 return true; 1196 } 1197 1198 // Determine if the flag has '+', '-', or '=' characters. 1199 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1200 const char* const argname = has_plus_minus ? arg + 1 : arg; 1201 1202 size_t arg_len; 1203 const char* equal_sign = strchr(argname, '='); 1204 if (equal_sign == NULL) { 1205 arg_len = strlen(argname); 1206 } else { 1207 arg_len = equal_sign - argname; 1208 } 1209 1210 // Only make the obsolete check for valid arguments. 1211 if (arg_len <= BUFLEN) { 1212 // Construct a string which consists only of the argument name without '+', '-', or '='. 1213 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1214 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1215 if (is_obsolete_flag(stripped_argname, &since)) { 1216 char version[256]; 1217 since.to_string(version, sizeof(version)); 1218 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1219 return true; 1220 } 1221 #ifndef PRODUCT 1222 else { 1223 const char* replacement; 1224 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1225 log_warning(arguments)("%s has been removed. Please use %s instead.", 1226 stripped_argname, 1227 replacement); 1228 return false; 1229 } 1230 } 1231 #endif //PRODUCT 1232 } 1233 1234 // For locked flags, report a custom error message if available. 1235 // Otherwise, report the standard unrecognized VM option. 1236 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1237 if (found_flag != NULL) { 1238 char locked_message_buf[BUFLEN]; 1239 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1240 if (strlen(locked_message_buf) == 0) { 1241 if (found_flag->is_bool() && !has_plus_minus) { 1242 jio_fprintf(defaultStream::error_stream(), 1243 "Missing +/- setting for VM option '%s'\n", argname); 1244 } else if (!found_flag->is_bool() && has_plus_minus) { 1245 jio_fprintf(defaultStream::error_stream(), 1246 "Unexpected +/- setting in VM option '%s'\n", argname); 1247 } else { 1248 jio_fprintf(defaultStream::error_stream(), 1249 "Improperly specified VM option '%s'\n", argname); 1250 } 1251 } else { 1252 #ifdef PRODUCT 1253 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1254 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1255 if (ignore_unrecognized && mismatched) { 1256 return true; 1257 } 1258 #endif 1259 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1260 } 1261 } else { 1262 if (ignore_unrecognized) { 1263 return true; 1264 } 1265 jio_fprintf(defaultStream::error_stream(), 1266 "Unrecognized VM option '%s'\n", argname); 1267 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1268 if (fuzzy_matched != NULL) { 1269 jio_fprintf(defaultStream::error_stream(), 1270 "Did you mean '%s%s%s'? ", 1271 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1272 fuzzy_matched->_name, 1273 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1274 } 1275 } 1276 1277 // allow for commandline "commenting out" options like -XX:#+Verbose 1278 return arg[0] == '#'; 1279 } 1280 1281 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1282 FILE* stream = fopen(file_name, "rb"); 1283 if (stream == NULL) { 1284 if (should_exist) { 1285 jio_fprintf(defaultStream::error_stream(), 1286 "Could not open settings file %s\n", file_name); 1287 return false; 1288 } else { 1289 return true; 1290 } 1291 } 1292 1293 char token[1024]; 1294 int pos = 0; 1295 1296 bool in_white_space = true; 1297 bool in_comment = false; 1298 bool in_quote = false; 1299 char quote_c = 0; 1300 bool result = true; 1301 1302 int c = getc(stream); 1303 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1304 if (in_white_space) { 1305 if (in_comment) { 1306 if (c == '\n') in_comment = false; 1307 } else { 1308 if (c == '#') in_comment = true; 1309 else if (!isspace(c)) { 1310 in_white_space = false; 1311 token[pos++] = c; 1312 } 1313 } 1314 } else { 1315 if (c == '\n' || (!in_quote && isspace(c))) { 1316 // token ends at newline, or at unquoted whitespace 1317 // this allows a way to include spaces in string-valued options 1318 token[pos] = '\0'; 1319 logOption(token); 1320 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1321 build_jvm_flags(token); 1322 pos = 0; 1323 in_white_space = true; 1324 in_quote = false; 1325 } else if (!in_quote && (c == '\'' || c == '"')) { 1326 in_quote = true; 1327 quote_c = c; 1328 } else if (in_quote && (c == quote_c)) { 1329 in_quote = false; 1330 } else { 1331 token[pos++] = c; 1332 } 1333 } 1334 c = getc(stream); 1335 } 1336 if (pos > 0) { 1337 token[pos] = '\0'; 1338 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1339 build_jvm_flags(token); 1340 } 1341 fclose(stream); 1342 return result; 1343 } 1344 1345 //============================================================================================================= 1346 // Parsing of properties (-D) 1347 1348 const char* Arguments::get_property(const char* key) { 1349 return PropertyList_get_value(system_properties(), key); 1350 } 1351 1352 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1353 const char* eq = strchr(prop, '='); 1354 const char* key; 1355 const char* value = ""; 1356 1357 if (eq == NULL) { 1358 // property doesn't have a value, thus use passed string 1359 key = prop; 1360 } else { 1361 // property have a value, thus extract it and save to the 1362 // allocated string 1363 size_t key_len = eq - prop; 1364 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1365 1366 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1367 key = tmp_key; 1368 1369 value = &prop[key_len + 1]; 1370 } 1371 1372 if (strcmp(key, "java.compiler") == 0) { 1373 process_java_compiler_argument(value); 1374 // Record value in Arguments, but let it get passed to Java. 1375 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1376 strcmp(key, "sun.java.launcher.pid") == 0) { 1377 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1378 // private and are processed in process_sun_java_launcher_properties(); 1379 // the sun.java.launcher property is passed on to the java application 1380 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1381 // append is true, writable is true, internal is false 1382 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1383 WriteableProperty, ExternalProperty); 1384 } else { 1385 if (strcmp(key, "sun.java.command") == 0) { 1386 char *old_java_command = _java_command; 1387 _java_command = os::strdup_check_oom(value, mtArguments); 1388 if (old_java_command != NULL) { 1389 os::free(old_java_command); 1390 } 1391 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1392 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1393 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1394 // its value without going through the property list or making a Java call. 1395 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1396 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1397 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1398 os::free((void *)old_java_vendor_url_bug); 1399 } 1400 } 1401 1402 // Create new property and add at the end of the list 1403 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1404 } 1405 1406 if (key != prop) { 1407 // SystemProperty copy passed value, thus free previously allocated 1408 // memory 1409 FreeHeap((void *)key); 1410 } 1411 1412 return true; 1413 } 1414 1415 #if INCLUDE_CDS 1416 void Arguments::check_unsupported_dumping_properties() { 1417 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1418 const char* unsupported_properties[] = { "jdk.module.main", 1419 "jdk.module.limitmods", 1420 "jdk.module.path", 1421 "jdk.module.upgrade.path", 1422 "jdk.module.patch.0" }; 1423 const char* unsupported_options[] = { "-m", // cannot use at dump time 1424 "--limit-modules", // ignored at dump time 1425 "--module-path", // ignored at dump time 1426 "--upgrade-module-path", // ignored at dump time 1427 "--patch-module" // ignored at dump time 1428 }; 1429 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1430 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1431 // vm will exit with an error message. Otherwise, it will print an informational message if 1432 // -Xlog:cds is enabled. 1433 uint info_idx = 1; 1434 SystemProperty* sp = system_properties(); 1435 while (sp != NULL) { 1436 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1437 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1438 if (i < info_idx) { 1439 vm_exit_during_initialization( 1440 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1441 } else { 1442 log_info(cds)("Info: the %s option is ignored when dumping the shared archive", 1443 unsupported_options[i]); 1444 } 1445 } 1446 } 1447 sp = sp->next(); 1448 } 1449 1450 // Check for an exploded module build in use with -Xshare:dump. 1451 if (!has_jimage()) { 1452 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1453 } 1454 } 1455 #endif 1456 1457 //=========================================================================================================== 1458 // Setting int/mixed/comp mode flags 1459 1460 void Arguments::set_mode_flags(Mode mode) { 1461 // Set up default values for all flags. 1462 // If you add a flag to any of the branches below, 1463 // add a default value for it here. 1464 set_java_compiler(false); 1465 _mode = mode; 1466 1467 // Ensure Agent_OnLoad has the correct initial values. 1468 // This may not be the final mode; mode may change later in onload phase. 1469 PropertyList_unique_add(&_system_properties, "java.vm.info", 1470 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1471 1472 UseInterpreter = true; 1473 UseCompiler = true; 1474 UseLoopCounter = true; 1475 1476 // Default values may be platform/compiler dependent - 1477 // use the saved values 1478 ClipInlining = Arguments::_ClipInlining; 1479 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1480 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1481 BackgroundCompilation = Arguments::_BackgroundCompilation; 1482 if (TieredCompilation) { 1483 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1484 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1485 } 1486 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1487 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1488 } 1489 } 1490 1491 // Change from defaults based on mode 1492 switch (mode) { 1493 default: 1494 ShouldNotReachHere(); 1495 break; 1496 case _int: 1497 UseCompiler = false; 1498 UseLoopCounter = false; 1499 AlwaysCompileLoopMethods = false; 1500 UseOnStackReplacement = false; 1501 break; 1502 case _mixed: 1503 // same as default 1504 break; 1505 case _comp: 1506 UseInterpreter = false; 1507 BackgroundCompilation = false; 1508 ClipInlining = false; 1509 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1510 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1511 // compile a level 4 (C2) and then continue executing it. 1512 if (TieredCompilation) { 1513 Tier3InvokeNotifyFreqLog = 0; 1514 Tier4InvocationThreshold = 0; 1515 } 1516 break; 1517 } 1518 } 1519 1520 // Conflict: required to use shared spaces (-Xshare:on), but 1521 // incompatible command line options were chosen. 1522 static void no_shared_spaces(const char* message) { 1523 if (RequireSharedSpaces) { 1524 jio_fprintf(defaultStream::error_stream(), 1525 "Class data sharing is inconsistent with other specified options.\n"); 1526 vm_exit_during_initialization("Unable to use shared archive.", message); 1527 } else { 1528 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1529 } 1530 } 1531 1532 // Returns threshold scaled with the value of scale. 1533 // If scale < 0.0, threshold is returned without scaling. 1534 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1535 if (scale == 1.0 || scale < 0.0) { 1536 return threshold; 1537 } else { 1538 return (intx)(threshold * scale); 1539 } 1540 } 1541 1542 // Returns freq_log scaled with the value of scale. 1543 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1544 // If scale < 0.0, freq_log is returned without scaling. 1545 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1546 // Check if scaling is necessary or if negative value was specified. 1547 if (scale == 1.0 || scale < 0.0) { 1548 return freq_log; 1549 } 1550 // Check values to avoid calculating log2 of 0. 1551 if (scale == 0.0 || freq_log == 0) { 1552 return 0; 1553 } 1554 // Determine the maximum notification frequency value currently supported. 1555 // The largest mask value that the interpreter/C1 can handle is 1556 // of length InvocationCounter::number_of_count_bits. Mask values are always 1557 // one bit shorter then the value of the notification frequency. Set 1558 // max_freq_bits accordingly. 1559 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1560 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1561 if (scaled_freq == 0) { 1562 // Return 0 right away to avoid calculating log2 of 0. 1563 return 0; 1564 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1565 return max_freq_bits; 1566 } else { 1567 return log2_intptr(scaled_freq); 1568 } 1569 } 1570 1571 void Arguments::set_tiered_flags() { 1572 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1573 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1574 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1575 } 1576 if (CompilationPolicyChoice < 2) { 1577 vm_exit_during_initialization( 1578 "Incompatible compilation policy selected", NULL); 1579 } 1580 // Increase the code cache size - tiered compiles a lot more. 1581 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1582 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1583 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1584 } 1585 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1586 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1587 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1588 } 1589 if (!UseInterpreter) { // -Xcomp 1590 Tier3InvokeNotifyFreqLog = 0; 1591 Tier4InvocationThreshold = 0; 1592 } 1593 1594 if (CompileThresholdScaling < 0) { 1595 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1596 } 1597 1598 // Scale tiered compilation thresholds. 1599 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1600 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1601 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1602 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1603 1604 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1605 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1606 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1607 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1608 1609 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1610 // once these thresholds become supported. 1611 1612 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1613 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1614 1615 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1616 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1617 1618 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1619 1620 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1621 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1622 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1623 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1624 } 1625 } 1626 1627 void set_object_alignment() { 1628 // Object alignment. 1629 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1630 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1631 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1632 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1633 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1634 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1635 1636 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1637 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1638 1639 // Oop encoding heap max 1640 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1641 1642 if (SurvivorAlignmentInBytes == 0) { 1643 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1644 } 1645 } 1646 1647 size_t Arguments::max_heap_for_compressed_oops() { 1648 // Avoid sign flip. 1649 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1650 // We need to fit both the NULL page and the heap into the memory budget, while 1651 // keeping alignment constraints of the heap. To guarantee the latter, as the 1652 // NULL page is located before the heap, we pad the NULL page to the conservative 1653 // maximum alignment that the GC may ever impose upon the heap. 1654 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1655 _conservative_max_heap_alignment); 1656 1657 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1658 NOT_LP64(ShouldNotReachHere(); return 0); 1659 } 1660 1661 void Arguments::set_use_compressed_oops() { 1662 #ifndef ZERO 1663 #ifdef _LP64 1664 // MaxHeapSize is not set up properly at this point, but 1665 // the only value that can override MaxHeapSize if we are 1666 // to use UseCompressedOops is InitialHeapSize. 1667 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1668 1669 if (max_heap_size <= max_heap_for_compressed_oops()) { 1670 #if !defined(COMPILER1) || defined(TIERED) 1671 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1672 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1673 } 1674 #endif 1675 } else { 1676 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1677 warning("Max heap size too large for Compressed Oops"); 1678 FLAG_SET_DEFAULT(UseCompressedOops, false); 1679 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1680 } 1681 } 1682 #endif // _LP64 1683 #endif // ZERO 1684 } 1685 1686 1687 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1688 // set_use_compressed_oops(). 1689 void Arguments::set_use_compressed_klass_ptrs() { 1690 #ifndef ZERO 1691 #ifdef _LP64 1692 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1693 if (!UseCompressedOops) { 1694 if (UseCompressedClassPointers) { 1695 warning("UseCompressedClassPointers requires UseCompressedOops"); 1696 } 1697 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1698 } else { 1699 // Turn on UseCompressedClassPointers too 1700 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1701 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1702 } 1703 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1704 if (UseCompressedClassPointers) { 1705 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1706 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1707 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1708 } 1709 } 1710 } 1711 #endif // _LP64 1712 #endif // !ZERO 1713 } 1714 1715 void Arguments::set_conservative_max_heap_alignment() { 1716 // The conservative maximum required alignment for the heap is the maximum of 1717 // the alignments imposed by several sources: any requirements from the heap 1718 // itself, the collector policy and the maximum page size we may run the VM 1719 // with. 1720 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment(); 1721 _conservative_max_heap_alignment = MAX4(heap_alignment, 1722 (size_t)os::vm_allocation_granularity(), 1723 os::max_page_size(), 1724 CollectorPolicy::compute_heap_alignment()); 1725 } 1726 1727 #ifdef TIERED 1728 bool Arguments::compilation_mode_selected() { 1729 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1730 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1731 1732 } 1733 1734 void Arguments::select_compilation_mode_ergonomically() { 1735 #if defined(_WINDOWS) && !defined(_LP64) 1736 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1737 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1738 } 1739 #endif 1740 if (NeverActAsServerClassMachine) { 1741 set_client_compilation_mode(); 1742 } 1743 } 1744 #endif //TIERED 1745 1746 #if INCLUDE_JVMCI 1747 void Arguments::set_jvmci_specific_flags() { 1748 if (UseJVMCICompiler) { 1749 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1750 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1751 } 1752 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1753 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1754 } 1755 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1756 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1757 } 1758 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1759 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1760 } 1761 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1762 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1763 } 1764 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1765 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1766 } 1767 if (TieredStopAtLevel != CompLevel_full_optimization) { 1768 // Currently JVMCI compiler can only work at the full optimization level 1769 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1770 TieredStopAtLevel = CompLevel_full_optimization; 1771 } 1772 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1773 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1774 } 1775 } 1776 } 1777 #endif 1778 1779 jint Arguments::set_ergonomics_flags() { 1780 #ifdef TIERED 1781 if (!compilation_mode_selected()) { 1782 select_compilation_mode_ergonomically(); 1783 } 1784 #endif 1785 1786 jint gc_result = GCArguments::initialize(); 1787 if (gc_result != JNI_OK) { 1788 return gc_result; 1789 } 1790 1791 #if COMPILER2_OR_JVMCI 1792 // Shared spaces work fine with other GCs but causes bytecode rewriting 1793 // to be disabled, which hurts interpreter performance and decreases 1794 // server performance. When -server is specified, keep the default off 1795 // unless it is asked for. Future work: either add bytecode rewriting 1796 // at link time, or rewrite bytecodes in non-shared methods. 1797 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1798 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1799 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1800 } 1801 #endif 1802 1803 set_conservative_max_heap_alignment(); 1804 1805 #ifndef ZERO 1806 #ifdef _LP64 1807 set_use_compressed_oops(); 1808 1809 // set_use_compressed_klass_ptrs() must be called after calling 1810 // set_use_compressed_oops(). 1811 set_use_compressed_klass_ptrs(); 1812 1813 // Also checks that certain machines are slower with compressed oops 1814 // in vm_version initialization code. 1815 #endif // _LP64 1816 #endif // !ZERO 1817 1818 return JNI_OK; 1819 } 1820 1821 void Arguments::set_gc_specific_flags() { 1822 // Set GC flags 1823 GCArguments::arguments()->initialize_flags(); 1824 } 1825 1826 julong Arguments::limit_by_allocatable_memory(julong limit) { 1827 julong max_allocatable; 1828 julong result = limit; 1829 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1830 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1831 } 1832 return result; 1833 } 1834 1835 // Use static initialization to get the default before parsing 1836 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1837 1838 void Arguments::set_heap_size() { 1839 julong phys_mem = 1840 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1841 : (julong)MaxRAM; 1842 1843 // Experimental support for CGroup memory limits 1844 if (UseCGroupMemoryLimitForHeap) { 1845 // This is a rough indicator that a CGroup limit may be in force 1846 // for this process 1847 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 1848 FILE *fp = fopen(lim_file, "r"); 1849 if (fp != NULL) { 1850 julong cgroup_max = 0; 1851 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 1852 if (ret == 1 && cgroup_max > 0) { 1853 // If unlimited, cgroup_max will be a very large, but unspecified 1854 // value, so use initial phys_mem as a limit 1855 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 1856 JULONG_FORMAT "MB) and initial phys_mem (" 1857 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 1858 phys_mem = MIN2(cgroup_max, phys_mem); 1859 } else { 1860 warning("Unable to read/parse cgroup memory limit from %s: %s", 1861 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 1862 } 1863 fclose(fp); 1864 } else { 1865 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 1866 } 1867 } 1868 1869 // Convert deprecated flags 1870 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1871 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1872 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1873 1874 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1875 !FLAG_IS_DEFAULT(MinRAMFraction)) 1876 MinRAMPercentage = 100.0 / MinRAMFraction; 1877 1878 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1879 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1880 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1881 1882 // If the maximum heap size has not been set with -Xmx, 1883 // then set it as fraction of the size of physical memory, 1884 // respecting the maximum and minimum sizes of the heap. 1885 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1886 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1887 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1888 if (reasonable_min < MaxHeapSize) { 1889 // Small physical memory, so use a minimum fraction of it for the heap 1890 reasonable_max = reasonable_min; 1891 } else { 1892 // Not-small physical memory, so require a heap at least 1893 // as large as MaxHeapSize 1894 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1895 } 1896 1897 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1898 // Limit the heap size to ErgoHeapSizeLimit 1899 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1900 } 1901 if (UseCompressedOops) { 1902 // Limit the heap size to the maximum possible when using compressed oops 1903 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1904 1905 // HeapBaseMinAddress can be greater than default but not less than. 1906 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1907 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1908 // matches compressed oops printing flags 1909 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1910 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1911 DefaultHeapBaseMinAddress, 1912 DefaultHeapBaseMinAddress/G, 1913 HeapBaseMinAddress); 1914 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1915 } 1916 } 1917 1918 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1919 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1920 // but it should be not less than default MaxHeapSize. 1921 max_coop_heap -= HeapBaseMinAddress; 1922 } 1923 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1924 } 1925 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1926 1927 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1928 // An initial heap size was specified on the command line, 1929 // so be sure that the maximum size is consistent. Done 1930 // after call to limit_by_allocatable_memory because that 1931 // method might reduce the allocation size. 1932 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1933 } 1934 1935 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1936 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1937 } 1938 1939 // If the minimum or initial heap_size have not been set or requested to be set 1940 // ergonomically, set them accordingly. 1941 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1942 julong reasonable_minimum = (julong)(OldSize + NewSize); 1943 1944 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1945 1946 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1947 1948 if (InitialHeapSize == 0) { 1949 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1950 1951 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1952 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1953 1954 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1955 1956 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1957 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1958 } 1959 // If the minimum heap size has not been set (via -Xms), 1960 // synchronize with InitialHeapSize to avoid errors with the default value. 1961 if (min_heap_size() == 0) { 1962 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1963 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1964 } 1965 } 1966 } 1967 1968 // This option inspects the machine and attempts to set various 1969 // parameters to be optimal for long-running, memory allocation 1970 // intensive jobs. It is intended for machines with large 1971 // amounts of cpu and memory. 1972 jint Arguments::set_aggressive_heap_flags() { 1973 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1974 // VM, but we may not be able to represent the total physical memory 1975 // available (like having 8gb of memory on a box but using a 32bit VM). 1976 // Thus, we need to make sure we're using a julong for intermediate 1977 // calculations. 1978 julong initHeapSize; 1979 julong total_memory = os::physical_memory(); 1980 1981 if (total_memory < (julong) 256 * M) { 1982 jio_fprintf(defaultStream::error_stream(), 1983 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1984 vm_exit(1); 1985 } 1986 1987 // The heap size is half of available memory, or (at most) 1988 // all of possible memory less 160mb (leaving room for the OS 1989 // when using ISM). This is the maximum; because adaptive sizing 1990 // is turned on below, the actual space used may be smaller. 1991 1992 initHeapSize = MIN2(total_memory / (julong) 2, 1993 total_memory - (julong) 160 * M); 1994 1995 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1996 1997 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1998 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 1999 return JNI_EINVAL; 2000 } 2001 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2002 return JNI_EINVAL; 2003 } 2004 // Currently the minimum size and the initial heap sizes are the same. 2005 set_min_heap_size(initHeapSize); 2006 } 2007 if (FLAG_IS_DEFAULT(NewSize)) { 2008 // Make the young generation 3/8ths of the total heap. 2009 if (FLAG_SET_CMDLINE(size_t, NewSize, 2010 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2011 return JNI_EINVAL; 2012 } 2013 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2014 return JNI_EINVAL; 2015 } 2016 } 2017 2018 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2019 FLAG_SET_DEFAULT(UseLargePages, true); 2020 #endif 2021 2022 // Increase some data structure sizes for efficiency 2023 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2024 return JNI_EINVAL; 2025 } 2026 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2027 return JNI_EINVAL; 2028 } 2029 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2030 return JNI_EINVAL; 2031 } 2032 2033 // See the OldPLABSize comment below, but replace 'after promotion' 2034 // with 'after copying'. YoungPLABSize is the size of the survivor 2035 // space per-gc-thread buffers. The default is 4kw. 2036 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2037 return JNI_EINVAL; 2038 } 2039 2040 // OldPLABSize is the size of the buffers in the old gen that 2041 // UseParallelGC uses to promote live data that doesn't fit in the 2042 // survivor spaces. At any given time, there's one for each gc thread. 2043 // The default size is 1kw. These buffers are rarely used, since the 2044 // survivor spaces are usually big enough. For specjbb, however, there 2045 // are occasions when there's lots of live data in the young gen 2046 // and we end up promoting some of it. We don't have a definite 2047 // explanation for why bumping OldPLABSize helps, but the theory 2048 // is that a bigger PLAB results in retaining something like the 2049 // original allocation order after promotion, which improves mutator 2050 // locality. A minor effect may be that larger PLABs reduce the 2051 // number of PLAB allocation events during gc. The value of 8kw 2052 // was arrived at by experimenting with specjbb. 2053 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2054 return JNI_EINVAL; 2055 } 2056 2057 // Enable parallel GC and adaptive generation sizing 2058 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2059 return JNI_EINVAL; 2060 } 2061 2062 // Encourage steady state memory management 2063 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2064 return JNI_EINVAL; 2065 } 2066 2067 // This appears to improve mutator locality 2068 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2069 return JNI_EINVAL; 2070 } 2071 2072 // Get around early Solaris scheduling bug 2073 // (affinity vs other jobs on system) 2074 // but disallow DR and offlining (5008695). 2075 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2076 return JNI_EINVAL; 2077 } 2078 2079 return JNI_OK; 2080 } 2081 2082 // This must be called after ergonomics. 2083 void Arguments::set_bytecode_flags() { 2084 if (!RewriteBytecodes) { 2085 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2086 } 2087 } 2088 2089 // Aggressive optimization flags -XX:+AggressiveOpts 2090 jint Arguments::set_aggressive_opts_flags() { 2091 #ifdef COMPILER2 2092 if (AggressiveUnboxing) { 2093 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2094 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2095 } else if (!EliminateAutoBox) { 2096 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2097 AggressiveUnboxing = false; 2098 } 2099 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2100 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2101 } else if (!DoEscapeAnalysis) { 2102 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2103 AggressiveUnboxing = false; 2104 } 2105 } 2106 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2107 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2108 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2109 } 2110 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2111 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2112 } 2113 2114 // Feed the cache size setting into the JDK 2115 char buffer[1024]; 2116 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2117 if (!add_property(buffer)) { 2118 return JNI_ENOMEM; 2119 } 2120 } 2121 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2122 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2123 } 2124 #endif 2125 2126 if (AggressiveOpts) { 2127 // Sample flag setting code 2128 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2129 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2130 // } 2131 } 2132 2133 return JNI_OK; 2134 } 2135 2136 //=========================================================================================================== 2137 // Parsing of java.compiler property 2138 2139 void Arguments::process_java_compiler_argument(const char* arg) { 2140 // For backwards compatibility, Djava.compiler=NONE or "" 2141 // causes us to switch to -Xint mode UNLESS -Xdebug 2142 // is also specified. 2143 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2144 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2145 } 2146 } 2147 2148 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2149 _sun_java_launcher = os::strdup_check_oom(launcher); 2150 } 2151 2152 bool Arguments::created_by_java_launcher() { 2153 assert(_sun_java_launcher != NULL, "property must have value"); 2154 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2155 } 2156 2157 bool Arguments::sun_java_launcher_is_altjvm() { 2158 return _sun_java_launcher_is_altjvm; 2159 } 2160 2161 //=========================================================================================================== 2162 // Parsing of main arguments 2163 2164 #if INCLUDE_JVMCI 2165 // Check consistency of jvmci vm argument settings. 2166 bool Arguments::check_jvmci_args_consistency() { 2167 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2168 } 2169 #endif //INCLUDE_JVMCI 2170 2171 // Check consistency of GC selection 2172 bool Arguments::check_gc_consistency() { 2173 // Ensure that the user has not selected conflicting sets 2174 // of collectors. 2175 uint i = 0; 2176 if (UseSerialGC) i++; 2177 if (UseConcMarkSweepGC) i++; 2178 if (UseParallelGC || UseParallelOldGC) i++; 2179 if (UseG1GC) i++; 2180 if (i > 1) { 2181 jio_fprintf(defaultStream::error_stream(), 2182 "Conflicting collector combinations in option list; " 2183 "please refer to the release notes for the combinations " 2184 "allowed\n"); 2185 return false; 2186 } 2187 2188 return true; 2189 } 2190 2191 // Check the consistency of vm_init_args 2192 bool Arguments::check_vm_args_consistency() { 2193 // Method for adding checks for flag consistency. 2194 // The intent is to warn the user of all possible conflicts, 2195 // before returning an error. 2196 // Note: Needs platform-dependent factoring. 2197 bool status = true; 2198 2199 if (TLABRefillWasteFraction == 0) { 2200 jio_fprintf(defaultStream::error_stream(), 2201 "TLABRefillWasteFraction should be a denominator, " 2202 "not " SIZE_FORMAT "\n", 2203 TLABRefillWasteFraction); 2204 status = false; 2205 } 2206 2207 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2208 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2209 } 2210 2211 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2212 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2213 } 2214 2215 if (GCTimeLimit == 100) { 2216 // Turn off gc-overhead-limit-exceeded checks 2217 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2218 } 2219 2220 status = status && check_gc_consistency(); 2221 2222 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2223 // insists that we hold the requisite locks so that the iteration is 2224 // MT-safe. For the verification at start-up and shut-down, we don't 2225 // yet have a good way of acquiring and releasing these locks, 2226 // which are not visible at the CollectedHeap level. We want to 2227 // be able to acquire these locks and then do the iteration rather 2228 // than just disable the lock verification. This will be fixed under 2229 // bug 4788986. 2230 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2231 if (VerifyDuringStartup) { 2232 warning("Heap verification at start-up disabled " 2233 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2234 VerifyDuringStartup = false; // Disable verification at start-up 2235 } 2236 2237 if (VerifyBeforeExit) { 2238 warning("Heap verification at shutdown disabled " 2239 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2240 VerifyBeforeExit = false; // Disable verification at shutdown 2241 } 2242 } 2243 2244 if (PrintNMTStatistics) { 2245 #if INCLUDE_NMT 2246 if (MemTracker::tracking_level() == NMT_off) { 2247 #endif // INCLUDE_NMT 2248 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2249 PrintNMTStatistics = false; 2250 #if INCLUDE_NMT 2251 } 2252 #endif 2253 } 2254 2255 #if INCLUDE_JVMCI 2256 status = status && check_jvmci_args_consistency(); 2257 2258 if (EnableJVMCI) { 2259 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2260 AddProperty, UnwriteableProperty, InternalProperty); 2261 2262 if (!ScavengeRootsInCode) { 2263 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2264 ScavengeRootsInCode = 1; 2265 } 2266 } 2267 #endif 2268 2269 // Check lower bounds of the code cache 2270 // Template Interpreter code is approximately 3X larger in debug builds. 2271 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2272 if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2273 jio_fprintf(defaultStream::error_stream(), 2274 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2275 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2276 status = false; 2277 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2278 jio_fprintf(defaultStream::error_stream(), 2279 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2280 min_code_cache_size/K); 2281 status = false; 2282 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2283 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2284 jio_fprintf(defaultStream::error_stream(), 2285 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2286 CODE_CACHE_SIZE_LIMIT/M); 2287 status = false; 2288 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2289 jio_fprintf(defaultStream::error_stream(), 2290 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2291 min_code_cache_size/K); 2292 status = false; 2293 } 2294 2295 #ifdef _LP64 2296 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2297 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2298 } 2299 #endif 2300 2301 #ifndef SUPPORT_RESERVED_STACK_AREA 2302 if (StackReservedPages != 0) { 2303 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2304 warning("Reserved Stack Area not supported on this platform"); 2305 } 2306 #endif 2307 2308 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2309 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2310 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2311 } 2312 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2313 } 2314 if (UseCompiler && is_interpreter_only()) { 2315 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2316 warning("UseCompiler disabled due to -Xint."); 2317 } 2318 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2319 } 2320 #ifdef COMPILER2 2321 if (PostLoopMultiversioning && !RangeCheckElimination) { 2322 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2323 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2324 } 2325 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2326 } 2327 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) { 2328 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) { 2329 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1"); 2330 } 2331 LoopStripMiningIter = 1; 2332 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) { 2333 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) { 2334 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0"); 2335 } 2336 LoopStripMiningIter = 0; 2337 } 2338 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) { 2339 // blind guess 2340 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10; 2341 } 2342 #endif 2343 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2344 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2345 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2346 } 2347 } 2348 return status; 2349 } 2350 2351 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2352 const char* option_type) { 2353 if (ignore) return false; 2354 2355 const char* spacer = " "; 2356 if (option_type == NULL) { 2357 option_type = ++spacer; // Set both to the empty string. 2358 } 2359 2360 if (os::obsolete_option(option)) { 2361 jio_fprintf(defaultStream::error_stream(), 2362 "Obsolete %s%soption: %s\n", option_type, spacer, 2363 option->optionString); 2364 return false; 2365 } else { 2366 jio_fprintf(defaultStream::error_stream(), 2367 "Unrecognized %s%soption: %s\n", option_type, spacer, 2368 option->optionString); 2369 return true; 2370 } 2371 } 2372 2373 static const char* user_assertion_options[] = { 2374 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2375 }; 2376 2377 static const char* system_assertion_options[] = { 2378 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2379 }; 2380 2381 bool Arguments::parse_uintx(const char* value, 2382 uintx* uintx_arg, 2383 uintx min_size) { 2384 2385 // Check the sign first since atojulong() parses only unsigned values. 2386 bool value_is_positive = !(*value == '-'); 2387 2388 if (value_is_positive) { 2389 julong n; 2390 bool good_return = atojulong(value, &n); 2391 if (good_return) { 2392 bool above_minimum = n >= min_size; 2393 bool value_is_too_large = n > max_uintx; 2394 2395 if (above_minimum && !value_is_too_large) { 2396 *uintx_arg = n; 2397 return true; 2398 } 2399 } 2400 } 2401 return false; 2402 } 2403 2404 unsigned int addreads_count = 0; 2405 unsigned int addexports_count = 0; 2406 unsigned int addopens_count = 0; 2407 unsigned int addmods_count = 0; 2408 unsigned int patch_mod_count = 0; 2409 2410 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2411 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2412 char* property = AllocateHeap(prop_len, mtArguments); 2413 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2414 if (ret < 0 || ret >= (int)prop_len) { 2415 FreeHeap(property); 2416 return false; 2417 } 2418 bool added = add_property(property, UnwriteableProperty, internal); 2419 FreeHeap(property); 2420 return added; 2421 } 2422 2423 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2424 const unsigned int props_count_limit = 1000; 2425 const int max_digits = 3; 2426 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2427 2428 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2429 if (count < props_count_limit) { 2430 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2431 char* property = AllocateHeap(prop_len, mtArguments); 2432 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2433 if (ret < 0 || ret >= (int)prop_len) { 2434 FreeHeap(property); 2435 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2436 return false; 2437 } 2438 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2439 FreeHeap(property); 2440 return added; 2441 } 2442 2443 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2444 return false; 2445 } 2446 2447 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2448 julong* long_arg, 2449 julong min_size, 2450 julong max_size) { 2451 if (!atojulong(s, long_arg)) return arg_unreadable; 2452 return check_memory_size(*long_arg, min_size, max_size); 2453 } 2454 2455 // Parse JavaVMInitArgs structure 2456 2457 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2458 const JavaVMInitArgs *java_options_args, 2459 const JavaVMInitArgs *cmd_line_args) { 2460 bool patch_mod_javabase = false; 2461 2462 // Save default settings for some mode flags 2463 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2464 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2465 Arguments::_ClipInlining = ClipInlining; 2466 Arguments::_BackgroundCompilation = BackgroundCompilation; 2467 if (TieredCompilation) { 2468 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2469 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2470 } 2471 2472 // Setup flags for mixed which is the default 2473 set_mode_flags(_mixed); 2474 2475 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2476 // variable (if present). 2477 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2478 if (result != JNI_OK) { 2479 return result; 2480 } 2481 2482 // Parse args structure generated from the command line flags. 2483 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2484 if (result != JNI_OK) { 2485 return result; 2486 } 2487 2488 // Parse args structure generated from the _JAVA_OPTIONS environment 2489 // variable (if present) (mimics classic VM) 2490 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2491 if (result != JNI_OK) { 2492 return result; 2493 } 2494 2495 // We need to ensure processor and memory resources have been properly 2496 // configured - which may rely on arguments we just processed - before 2497 // doing the final argument processing. Any argument processing that 2498 // needs to know about processor and memory resources must occur after 2499 // this point. 2500 2501 os::init_container_support(); 2502 2503 // Do final processing now that all arguments have been parsed 2504 result = finalize_vm_init_args(patch_mod_javabase); 2505 if (result != JNI_OK) { 2506 return result; 2507 } 2508 2509 return JNI_OK; 2510 } 2511 2512 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2513 // represents a valid JDWP agent. is_path==true denotes that we 2514 // are dealing with -agentpath (case where name is a path), otherwise with 2515 // -agentlib 2516 bool valid_jdwp_agent(char *name, bool is_path) { 2517 char *_name; 2518 const char *_jdwp = "jdwp"; 2519 size_t _len_jdwp, _len_prefix; 2520 2521 if (is_path) { 2522 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2523 return false; 2524 } 2525 2526 _name++; // skip past last path separator 2527 _len_prefix = strlen(JNI_LIB_PREFIX); 2528 2529 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2530 return false; 2531 } 2532 2533 _name += _len_prefix; 2534 _len_jdwp = strlen(_jdwp); 2535 2536 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2537 _name += _len_jdwp; 2538 } 2539 else { 2540 return false; 2541 } 2542 2543 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2544 return false; 2545 } 2546 2547 return true; 2548 } 2549 2550 if (strcmp(name, _jdwp) == 0) { 2551 return true; 2552 } 2553 2554 return false; 2555 } 2556 2557 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2558 // --patch-module=<module>=<file>(<pathsep><file>)* 2559 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2560 // Find the equal sign between the module name and the path specification 2561 const char* module_equal = strchr(patch_mod_tail, '='); 2562 if (module_equal == NULL) { 2563 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2564 return JNI_ERR; 2565 } else { 2566 // Pick out the module name 2567 size_t module_len = module_equal - patch_mod_tail; 2568 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2569 if (module_name != NULL) { 2570 memcpy(module_name, patch_mod_tail, module_len); 2571 *(module_name + module_len) = '\0'; 2572 // The path piece begins one past the module_equal sign 2573 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2574 FREE_C_HEAP_ARRAY(char, module_name); 2575 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2576 return JNI_ENOMEM; 2577 } 2578 } else { 2579 return JNI_ENOMEM; 2580 } 2581 } 2582 return JNI_OK; 2583 } 2584 2585 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2586 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2587 // The min and max sizes match the values in globals.hpp, but scaled 2588 // with K. The values have been chosen so that alignment with page 2589 // size doesn't change the max value, which makes the conversions 2590 // back and forth between Xss value and ThreadStackSize value easier. 2591 // The values have also been chosen to fit inside a 32-bit signed type. 2592 const julong min_ThreadStackSize = 0; 2593 const julong max_ThreadStackSize = 1 * M; 2594 2595 const julong min_size = min_ThreadStackSize * K; 2596 const julong max_size = max_ThreadStackSize * K; 2597 2598 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2599 2600 julong size = 0; 2601 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2602 if (errcode != arg_in_range) { 2603 bool silent = (option == NULL); // Allow testing to silence error messages 2604 if (!silent) { 2605 jio_fprintf(defaultStream::error_stream(), 2606 "Invalid thread stack size: %s\n", option->optionString); 2607 describe_range_error(errcode); 2608 } 2609 return JNI_EINVAL; 2610 } 2611 2612 // Internally track ThreadStackSize in units of 1024 bytes. 2613 const julong size_aligned = align_up(size, K); 2614 assert(size <= size_aligned, 2615 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2616 size, size_aligned); 2617 2618 const julong size_in_K = size_aligned / K; 2619 assert(size_in_K < (julong)max_intx, 2620 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2621 size_in_K); 2622 2623 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2624 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2625 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2626 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2627 max_expanded, size_in_K); 2628 2629 *out_ThreadStackSize = (intx)size_in_K; 2630 2631 return JNI_OK; 2632 } 2633 2634 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2635 // For match_option to return remaining or value part of option string 2636 const char* tail; 2637 2638 // iterate over arguments 2639 for (int index = 0; index < args->nOptions; index++) { 2640 bool is_absolute_path = false; // for -agentpath vs -agentlib 2641 2642 const JavaVMOption* option = args->options + index; 2643 2644 if (!match_option(option, "-Djava.class.path", &tail) && 2645 !match_option(option, "-Dsun.java.command", &tail) && 2646 !match_option(option, "-Dsun.java.launcher", &tail)) { 2647 2648 // add all jvm options to the jvm_args string. This string 2649 // is used later to set the java.vm.args PerfData string constant. 2650 // the -Djava.class.path and the -Dsun.java.command options are 2651 // omitted from jvm_args string as each have their own PerfData 2652 // string constant object. 2653 build_jvm_args(option->optionString); 2654 } 2655 2656 // -verbose:[class/module/gc/jni] 2657 if (match_option(option, "-verbose", &tail)) { 2658 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2659 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2660 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2661 } else if (!strcmp(tail, ":module")) { 2662 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2663 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2664 } else if (!strcmp(tail, ":gc")) { 2665 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2666 } else if (!strcmp(tail, ":jni")) { 2667 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2668 return JNI_EINVAL; 2669 } 2670 } 2671 // -da / -ea / -disableassertions / -enableassertions 2672 // These accept an optional class/package name separated by a colon, e.g., 2673 // -da:java.lang.Thread. 2674 } else if (match_option(option, user_assertion_options, &tail, true)) { 2675 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2676 if (*tail == '\0') { 2677 JavaAssertions::setUserClassDefault(enable); 2678 } else { 2679 assert(*tail == ':', "bogus match by match_option()"); 2680 JavaAssertions::addOption(tail + 1, enable); 2681 } 2682 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2683 } else if (match_option(option, system_assertion_options, &tail, false)) { 2684 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2685 JavaAssertions::setSystemClassDefault(enable); 2686 // -bootclasspath: 2687 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2688 jio_fprintf(defaultStream::output_stream(), 2689 "-Xbootclasspath is no longer a supported option.\n"); 2690 return JNI_EINVAL; 2691 // -bootclasspath/a: 2692 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2693 Arguments::append_sysclasspath(tail); 2694 // -bootclasspath/p: 2695 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2696 jio_fprintf(defaultStream::output_stream(), 2697 "-Xbootclasspath/p is no longer a supported option.\n"); 2698 return JNI_EINVAL; 2699 // -Xrun 2700 } else if (match_option(option, "-Xrun", &tail)) { 2701 if (tail != NULL) { 2702 const char* pos = strchr(tail, ':'); 2703 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2704 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2705 jio_snprintf(name, len + 1, "%s", tail); 2706 2707 char *options = NULL; 2708 if(pos != NULL) { 2709 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2710 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2711 } 2712 #if !INCLUDE_JVMTI 2713 if (strcmp(name, "jdwp") == 0) { 2714 jio_fprintf(defaultStream::error_stream(), 2715 "Debugging agents are not supported in this VM\n"); 2716 return JNI_ERR; 2717 } 2718 #endif // !INCLUDE_JVMTI 2719 add_init_library(name, options); 2720 } 2721 } else if (match_option(option, "--add-reads=", &tail)) { 2722 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2723 return JNI_ENOMEM; 2724 } 2725 } else if (match_option(option, "--add-exports=", &tail)) { 2726 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2727 return JNI_ENOMEM; 2728 } 2729 } else if (match_option(option, "--add-opens=", &tail)) { 2730 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2731 return JNI_ENOMEM; 2732 } 2733 } else if (match_option(option, "--add-modules=", &tail)) { 2734 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2735 return JNI_ENOMEM; 2736 } 2737 } else if (match_option(option, "--limit-modules=", &tail)) { 2738 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2739 return JNI_ENOMEM; 2740 } 2741 } else if (match_option(option, "--module-path=", &tail)) { 2742 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2743 return JNI_ENOMEM; 2744 } 2745 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2746 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2747 return JNI_ENOMEM; 2748 } 2749 } else if (match_option(option, "--patch-module=", &tail)) { 2750 // --patch-module=<module>=<file>(<pathsep><file>)* 2751 int res = process_patch_mod_option(tail, patch_mod_javabase); 2752 if (res != JNI_OK) { 2753 return res; 2754 } 2755 } else if (match_option(option, "--illegal-access=", &tail)) { 2756 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2757 return JNI_ENOMEM; 2758 } 2759 // -agentlib and -agentpath 2760 } else if (match_option(option, "-agentlib:", &tail) || 2761 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2762 if(tail != NULL) { 2763 const char* pos = strchr(tail, '='); 2764 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2765 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2766 name[len] = '\0'; 2767 2768 char *options = NULL; 2769 if(pos != NULL) { 2770 options = os::strdup_check_oom(pos + 1, mtArguments); 2771 } 2772 #if !INCLUDE_JVMTI 2773 if (valid_jdwp_agent(name, is_absolute_path)) { 2774 jio_fprintf(defaultStream::error_stream(), 2775 "Debugging agents are not supported in this VM\n"); 2776 return JNI_ERR; 2777 } 2778 #endif // !INCLUDE_JVMTI 2779 add_init_agent(name, options, is_absolute_path); 2780 } 2781 // -javaagent 2782 } else if (match_option(option, "-javaagent:", &tail)) { 2783 #if !INCLUDE_JVMTI 2784 jio_fprintf(defaultStream::error_stream(), 2785 "Instrumentation agents are not supported in this VM\n"); 2786 return JNI_ERR; 2787 #else 2788 if (tail != NULL) { 2789 size_t length = strlen(tail) + 1; 2790 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2791 jio_snprintf(options, length, "%s", tail); 2792 add_init_agent("instrument", options, false); 2793 // java agents need module java.instrument 2794 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2795 return JNI_ENOMEM; 2796 } 2797 } 2798 #endif // !INCLUDE_JVMTI 2799 // -Xnoclassgc 2800 } else if (match_option(option, "-Xnoclassgc")) { 2801 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2802 return JNI_EINVAL; 2803 } 2804 // -Xconcgc 2805 } else if (match_option(option, "-Xconcgc")) { 2806 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2807 return JNI_EINVAL; 2808 } 2809 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2810 // -Xnoconcgc 2811 } else if (match_option(option, "-Xnoconcgc")) { 2812 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2813 return JNI_EINVAL; 2814 } 2815 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2816 // -Xbatch 2817 } else if (match_option(option, "-Xbatch")) { 2818 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2819 return JNI_EINVAL; 2820 } 2821 // -Xmn for compatibility with other JVM vendors 2822 } else if (match_option(option, "-Xmn", &tail)) { 2823 julong long_initial_young_size = 0; 2824 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2825 if (errcode != arg_in_range) { 2826 jio_fprintf(defaultStream::error_stream(), 2827 "Invalid initial young generation size: %s\n", option->optionString); 2828 describe_range_error(errcode); 2829 return JNI_EINVAL; 2830 } 2831 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2832 return JNI_EINVAL; 2833 } 2834 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2835 return JNI_EINVAL; 2836 } 2837 // -Xms 2838 } else if (match_option(option, "-Xms", &tail)) { 2839 julong long_initial_heap_size = 0; 2840 // an initial heap size of 0 means automatically determine 2841 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2842 if (errcode != arg_in_range) { 2843 jio_fprintf(defaultStream::error_stream(), 2844 "Invalid initial heap size: %s\n", option->optionString); 2845 describe_range_error(errcode); 2846 return JNI_EINVAL; 2847 } 2848 set_min_heap_size((size_t)long_initial_heap_size); 2849 // Currently the minimum size and the initial heap sizes are the same. 2850 // Can be overridden with -XX:InitialHeapSize. 2851 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2852 return JNI_EINVAL; 2853 } 2854 // -Xmx 2855 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2856 julong long_max_heap_size = 0; 2857 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2858 if (errcode != arg_in_range) { 2859 jio_fprintf(defaultStream::error_stream(), 2860 "Invalid maximum heap size: %s\n", option->optionString); 2861 describe_range_error(errcode); 2862 return JNI_EINVAL; 2863 } 2864 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2865 return JNI_EINVAL; 2866 } 2867 // Xmaxf 2868 } else if (match_option(option, "-Xmaxf", &tail)) { 2869 char* err; 2870 int maxf = (int)(strtod(tail, &err) * 100); 2871 if (*err != '\0' || *tail == '\0') { 2872 jio_fprintf(defaultStream::error_stream(), 2873 "Bad max heap free percentage size: %s\n", 2874 option->optionString); 2875 return JNI_EINVAL; 2876 } else { 2877 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2878 return JNI_EINVAL; 2879 } 2880 } 2881 // Xminf 2882 } else if (match_option(option, "-Xminf", &tail)) { 2883 char* err; 2884 int minf = (int)(strtod(tail, &err) * 100); 2885 if (*err != '\0' || *tail == '\0') { 2886 jio_fprintf(defaultStream::error_stream(), 2887 "Bad min heap free percentage size: %s\n", 2888 option->optionString); 2889 return JNI_EINVAL; 2890 } else { 2891 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2892 return JNI_EINVAL; 2893 } 2894 } 2895 // -Xss 2896 } else if (match_option(option, "-Xss", &tail)) { 2897 intx value = 0; 2898 jint err = parse_xss(option, tail, &value); 2899 if (err != JNI_OK) { 2900 return err; 2901 } 2902 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) { 2903 return JNI_EINVAL; 2904 } 2905 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2906 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2907 julong long_ReservedCodeCacheSize = 0; 2908 2909 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2910 if (errcode != arg_in_range) { 2911 jio_fprintf(defaultStream::error_stream(), 2912 "Invalid maximum code cache size: %s.\n", option->optionString); 2913 return JNI_EINVAL; 2914 } 2915 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 2916 return JNI_EINVAL; 2917 } 2918 // -green 2919 } else if (match_option(option, "-green")) { 2920 jio_fprintf(defaultStream::error_stream(), 2921 "Green threads support not available\n"); 2922 return JNI_EINVAL; 2923 // -native 2924 } else if (match_option(option, "-native")) { 2925 // HotSpot always uses native threads, ignore silently for compatibility 2926 // -Xrs 2927 } else if (match_option(option, "-Xrs")) { 2928 // Classic/EVM option, new functionality 2929 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 2930 return JNI_EINVAL; 2931 } 2932 // -Xprof 2933 } else if (match_option(option, "-Xprof")) { 2934 char version[256]; 2935 // Obsolete in JDK 10 2936 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2937 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2938 // -Xconcurrentio 2939 } else if (match_option(option, "-Xconcurrentio")) { 2940 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 2941 return JNI_EINVAL; 2942 } 2943 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2944 return JNI_EINVAL; 2945 } 2946 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 2947 return JNI_EINVAL; 2948 } 2949 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 2950 return JNI_EINVAL; 2951 } 2952 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 2953 return JNI_EINVAL; 2954 } 2955 2956 // -Xinternalversion 2957 } else if (match_option(option, "-Xinternalversion")) { 2958 jio_fprintf(defaultStream::output_stream(), "%s\n", 2959 VM_Version::internal_vm_info_string()); 2960 vm_exit(0); 2961 #ifndef PRODUCT 2962 // -Xprintflags 2963 } else if (match_option(option, "-Xprintflags")) { 2964 CommandLineFlags::printFlags(tty, false); 2965 vm_exit(0); 2966 #endif 2967 // -D 2968 } else if (match_option(option, "-D", &tail)) { 2969 const char* value; 2970 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2971 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2972 // abort if -Djava.endorsed.dirs is set 2973 jio_fprintf(defaultStream::output_stream(), 2974 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2975 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2976 return JNI_EINVAL; 2977 } 2978 if (match_option(option, "-Djava.ext.dirs=", &value) && 2979 *value != '\0' && strcmp(value, "\"\"") != 0) { 2980 // abort if -Djava.ext.dirs is set 2981 jio_fprintf(defaultStream::output_stream(), 2982 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2983 return JNI_EINVAL; 2984 } 2985 // Check for module related properties. They must be set using the modules 2986 // options. For example: use "--add-modules=java.sql", not 2987 // "-Djdk.module.addmods=java.sql" 2988 if (is_internal_module_property(option->optionString + 2)) { 2989 needs_module_property_warning = true; 2990 continue; 2991 } 2992 2993 if (!add_property(tail)) { 2994 return JNI_ENOMEM; 2995 } 2996 // Out of the box management support 2997 if (match_option(option, "-Dcom.sun.management", &tail)) { 2998 #if INCLUDE_MANAGEMENT 2999 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3000 return JNI_EINVAL; 3001 } 3002 // management agent in module jdk.management.agent 3003 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3004 return JNI_ENOMEM; 3005 } 3006 #else 3007 jio_fprintf(defaultStream::output_stream(), 3008 "-Dcom.sun.management is not supported in this VM.\n"); 3009 return JNI_ERR; 3010 #endif 3011 } 3012 // -Xint 3013 } else if (match_option(option, "-Xint")) { 3014 set_mode_flags(_int); 3015 // -Xmixed 3016 } else if (match_option(option, "-Xmixed")) { 3017 set_mode_flags(_mixed); 3018 // -Xcomp 3019 } else if (match_option(option, "-Xcomp")) { 3020 // for testing the compiler; turn off all flags that inhibit compilation 3021 set_mode_flags(_comp); 3022 // -Xshare:dump 3023 } else if (match_option(option, "-Xshare:dump")) { 3024 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3025 return JNI_EINVAL; 3026 } 3027 set_mode_flags(_int); // Prevent compilation, which creates objects 3028 // -Xshare:on 3029 } else if (match_option(option, "-Xshare:on")) { 3030 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3031 return JNI_EINVAL; 3032 } 3033 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3034 return JNI_EINVAL; 3035 } 3036 // -Xshare:auto 3037 } else if (match_option(option, "-Xshare:auto")) { 3038 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3039 return JNI_EINVAL; 3040 } 3041 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3042 return JNI_EINVAL; 3043 } 3044 // -Xshare:off 3045 } else if (match_option(option, "-Xshare:off")) { 3046 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3047 return JNI_EINVAL; 3048 } 3049 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3050 return JNI_EINVAL; 3051 } 3052 // -Xverify 3053 } else if (match_option(option, "-Xverify", &tail)) { 3054 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3055 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3056 return JNI_EINVAL; 3057 } 3058 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3059 return JNI_EINVAL; 3060 } 3061 } else if (strcmp(tail, ":remote") == 0) { 3062 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3063 return JNI_EINVAL; 3064 } 3065 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3066 return JNI_EINVAL; 3067 } 3068 } else if (strcmp(tail, ":none") == 0) { 3069 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3070 return JNI_EINVAL; 3071 } 3072 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3073 return JNI_EINVAL; 3074 } 3075 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3076 return JNI_EINVAL; 3077 } 3078 // -Xdebug 3079 } else if (match_option(option, "-Xdebug")) { 3080 // note this flag has been used, then ignore 3081 set_xdebug_mode(true); 3082 // -Xnoagent 3083 } else if (match_option(option, "-Xnoagent")) { 3084 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3085 } else if (match_option(option, "-Xloggc:", &tail)) { 3086 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3087 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3088 _gc_log_filename = os::strdup_check_oom(tail); 3089 } else if (match_option(option, "-Xlog", &tail)) { 3090 bool ret = false; 3091 if (strcmp(tail, ":help") == 0) { 3092 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3093 vm_exit(0); 3094 } else if (strcmp(tail, ":disable") == 0) { 3095 LogConfiguration::disable_logging(); 3096 ret = true; 3097 } else if (*tail == '\0') { 3098 ret = LogConfiguration::parse_command_line_arguments(); 3099 assert(ret, "-Xlog without arguments should never fail to parse"); 3100 } else if (*tail == ':') { 3101 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3102 } 3103 if (ret == false) { 3104 jio_fprintf(defaultStream::error_stream(), 3105 "Invalid -Xlog option '-Xlog%s'\n", 3106 tail); 3107 return JNI_EINVAL; 3108 } 3109 // JNI hooks 3110 } else if (match_option(option, "-Xcheck", &tail)) { 3111 if (!strcmp(tail, ":jni")) { 3112 #if !INCLUDE_JNI_CHECK 3113 warning("JNI CHECKING is not supported in this VM"); 3114 #else 3115 CheckJNICalls = true; 3116 #endif // INCLUDE_JNI_CHECK 3117 } else if (is_bad_option(option, args->ignoreUnrecognized, 3118 "check")) { 3119 return JNI_EINVAL; 3120 } 3121 } else if (match_option(option, "vfprintf")) { 3122 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3123 } else if (match_option(option, "exit")) { 3124 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3125 } else if (match_option(option, "abort")) { 3126 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3127 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3128 // and the last option wins. 3129 } else if (match_option(option, "-XX:+NeverTenure")) { 3130 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3131 return JNI_EINVAL; 3132 } 3133 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3134 return JNI_EINVAL; 3135 } 3136 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3137 return JNI_EINVAL; 3138 } 3139 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3140 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3141 return JNI_EINVAL; 3142 } 3143 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3144 return JNI_EINVAL; 3145 } 3146 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3147 return JNI_EINVAL; 3148 } 3149 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3150 uintx max_tenuring_thresh = 0; 3151 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3152 jio_fprintf(defaultStream::error_stream(), 3153 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3154 return JNI_EINVAL; 3155 } 3156 3157 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3158 return JNI_EINVAL; 3159 } 3160 3161 if (MaxTenuringThreshold == 0) { 3162 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3163 return JNI_EINVAL; 3164 } 3165 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3166 return JNI_EINVAL; 3167 } 3168 } else { 3169 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3170 return JNI_EINVAL; 3171 } 3172 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3173 return JNI_EINVAL; 3174 } 3175 } 3176 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3177 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3178 return JNI_EINVAL; 3179 } 3180 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3181 return JNI_EINVAL; 3182 } 3183 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3184 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3185 return JNI_EINVAL; 3186 } 3187 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3188 return JNI_EINVAL; 3189 } 3190 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3191 #if defined(DTRACE_ENABLED) 3192 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3193 return JNI_EINVAL; 3194 } 3195 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3196 return JNI_EINVAL; 3197 } 3198 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3199 return JNI_EINVAL; 3200 } 3201 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3202 return JNI_EINVAL; 3203 } 3204 #else // defined(DTRACE_ENABLED) 3205 jio_fprintf(defaultStream::error_stream(), 3206 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3207 return JNI_EINVAL; 3208 #endif // defined(DTRACE_ENABLED) 3209 #ifdef ASSERT 3210 } else if (match_option(option, "-XX:+FullGCALot")) { 3211 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3212 return JNI_EINVAL; 3213 } 3214 // disable scavenge before parallel mark-compact 3215 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3216 return JNI_EINVAL; 3217 } 3218 #endif 3219 #if !INCLUDE_MANAGEMENT 3220 } else if (match_option(option, "-XX:+ManagementServer")) { 3221 jio_fprintf(defaultStream::error_stream(), 3222 "ManagementServer is not supported in this VM.\n"); 3223 return JNI_ERR; 3224 #endif // INCLUDE_MANAGEMENT 3225 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3226 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3227 // already been handled 3228 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3229 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3230 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3231 return JNI_EINVAL; 3232 } 3233 } 3234 // Unknown option 3235 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3236 return JNI_ERR; 3237 } 3238 } 3239 3240 // PrintSharedArchiveAndExit will turn on 3241 // -Xshare:on 3242 // -Xlog:class+path=info 3243 if (PrintSharedArchiveAndExit) { 3244 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3245 return JNI_EINVAL; 3246 } 3247 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3248 return JNI_EINVAL; 3249 } 3250 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3251 } 3252 3253 // Change the default value for flags which have different default values 3254 // when working with older JDKs. 3255 #ifdef LINUX 3256 if (JDK_Version::current().compare_major(6) <= 0 && 3257 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3258 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3259 } 3260 #endif // LINUX 3261 fix_appclasspath(); 3262 return JNI_OK; 3263 } 3264 3265 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3266 // For java.base check for duplicate --patch-module options being specified on the command line. 3267 // This check is only required for java.base, all other duplicate module specifications 3268 // will be checked during module system initialization. The module system initialization 3269 // will throw an ExceptionInInitializerError if this situation occurs. 3270 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3271 if (*patch_mod_javabase) { 3272 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3273 } else { 3274 *patch_mod_javabase = true; 3275 } 3276 } 3277 3278 // Create GrowableArray lazily, only if --patch-module has been specified 3279 if (_patch_mod_prefix == NULL) { 3280 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3281 } 3282 3283 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3284 } 3285 3286 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3287 // 3288 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3289 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3290 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3291 // path is treated as the current directory. 3292 // 3293 // This causes problems with CDS, which requires that all directories specified in the classpath 3294 // must be empty. In most cases, applications do NOT want to load classes from the current 3295 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3296 // scripts compatible with CDS. 3297 void Arguments::fix_appclasspath() { 3298 if (IgnoreEmptyClassPaths) { 3299 const char separator = *os::path_separator(); 3300 const char* src = _java_class_path->value(); 3301 3302 // skip over all the leading empty paths 3303 while (*src == separator) { 3304 src ++; 3305 } 3306 3307 char* copy = os::strdup_check_oom(src, mtArguments); 3308 3309 // trim all trailing empty paths 3310 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3311 *tail = '\0'; 3312 } 3313 3314 char from[3] = {separator, separator, '\0'}; 3315 char to [2] = {separator, '\0'}; 3316 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3317 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3318 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3319 } 3320 3321 _java_class_path->set_writeable_value(copy); 3322 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3323 } 3324 } 3325 3326 static bool has_jar_files(const char* directory) { 3327 DIR* dir = os::opendir(directory); 3328 if (dir == NULL) return false; 3329 3330 struct dirent *entry; 3331 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3332 bool hasJarFile = false; 3333 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3334 const char* name = entry->d_name; 3335 const char* ext = name + strlen(name) - 4; 3336 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3337 } 3338 FREE_C_HEAP_ARRAY(char, dbuf); 3339 os::closedir(dir); 3340 return hasJarFile ; 3341 } 3342 3343 static int check_non_empty_dirs(const char* path) { 3344 const char separator = *os::path_separator(); 3345 const char* const end = path + strlen(path); 3346 int nonEmptyDirs = 0; 3347 while (path < end) { 3348 const char* tmp_end = strchr(path, separator); 3349 if (tmp_end == NULL) { 3350 if (has_jar_files(path)) { 3351 nonEmptyDirs++; 3352 jio_fprintf(defaultStream::output_stream(), 3353 "Non-empty directory: %s\n", path); 3354 } 3355 path = end; 3356 } else { 3357 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3358 memcpy(dirpath, path, tmp_end - path); 3359 dirpath[tmp_end - path] = '\0'; 3360 if (has_jar_files(dirpath)) { 3361 nonEmptyDirs++; 3362 jio_fprintf(defaultStream::output_stream(), 3363 "Non-empty directory: %s\n", dirpath); 3364 } 3365 FREE_C_HEAP_ARRAY(char, dirpath); 3366 path = tmp_end + 1; 3367 } 3368 } 3369 return nonEmptyDirs; 3370 } 3371 3372 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3373 // check if the default lib/endorsed directory exists; if so, error 3374 char path[JVM_MAXPATHLEN]; 3375 const char* fileSep = os::file_separator(); 3376 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3377 3378 if (CheckEndorsedAndExtDirs) { 3379 int nonEmptyDirs = 0; 3380 // check endorsed directory 3381 nonEmptyDirs += check_non_empty_dirs(path); 3382 // check the extension directories 3383 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3384 if (nonEmptyDirs > 0) { 3385 return JNI_ERR; 3386 } 3387 } 3388 3389 DIR* dir = os::opendir(path); 3390 if (dir != NULL) { 3391 jio_fprintf(defaultStream::output_stream(), 3392 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3393 "in modular form will be supported via the concept of upgradeable modules.\n"); 3394 os::closedir(dir); 3395 return JNI_ERR; 3396 } 3397 3398 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3399 dir = os::opendir(path); 3400 if (dir != NULL) { 3401 jio_fprintf(defaultStream::output_stream(), 3402 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3403 "Use -classpath instead.\n."); 3404 os::closedir(dir); 3405 return JNI_ERR; 3406 } 3407 3408 // This must be done after all arguments have been processed 3409 // and the container support has been initialized since AggressiveHeap 3410 // relies on the amount of total memory available. 3411 if (AggressiveHeap) { 3412 jint result = set_aggressive_heap_flags(); 3413 if (result != JNI_OK) { 3414 return result; 3415 } 3416 } 3417 3418 // This must be done after all arguments have been processed. 3419 // java_compiler() true means set to "NONE" or empty. 3420 if (java_compiler() && !xdebug_mode()) { 3421 // For backwards compatibility, we switch to interpreted mode if 3422 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3423 // not specified. 3424 set_mode_flags(_int); 3425 } 3426 3427 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3428 // but like -Xint, leave compilation thresholds unaffected. 3429 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3430 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3431 set_mode_flags(_int); 3432 } 3433 3434 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3435 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3436 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3437 } 3438 3439 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3440 // Don't degrade server performance for footprint 3441 if (FLAG_IS_DEFAULT(UseLargePages) && 3442 MaxHeapSize < LargePageHeapSizeThreshold) { 3443 // No need for large granularity pages w/small heaps. 3444 // Note that large pages are enabled/disabled for both the 3445 // Java heap and the code cache. 3446 FLAG_SET_DEFAULT(UseLargePages, false); 3447 } 3448 3449 #elif defined(COMPILER2) 3450 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3451 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3452 } 3453 #endif 3454 3455 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3456 UNSUPPORTED_OPTION(ProfileInterpreter); 3457 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3458 #endif 3459 3460 #ifndef TIERED 3461 // Tiered compilation is undefined. 3462 UNSUPPORTED_OPTION(TieredCompilation); 3463 #endif 3464 3465 #if INCLUDE_JVMCI 3466 if (EnableJVMCI && 3467 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3468 return JNI_ENOMEM; 3469 } 3470 #endif 3471 3472 // If we are running in a headless jre, force java.awt.headless property 3473 // to be true unless the property has already been set. 3474 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3475 if (os::is_headless_jre()) { 3476 const char* headless = Arguments::get_property("java.awt.headless"); 3477 if (headless == NULL) { 3478 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3479 if (headless_env == NULL) { 3480 if (!add_property("java.awt.headless=true")) { 3481 return JNI_ENOMEM; 3482 } 3483 } else { 3484 char buffer[256]; 3485 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3486 if (!add_property(buffer)) { 3487 return JNI_ENOMEM; 3488 } 3489 } 3490 } 3491 } 3492 3493 if (!check_vm_args_consistency()) { 3494 return JNI_ERR; 3495 } 3496 3497 #if INCLUDE_JVMCI 3498 if (UseJVMCICompiler) { 3499 Compilation_mode = CompMode_server; 3500 } 3501 #endif 3502 3503 #if INCLUDE_CDS 3504 if (DumpSharedSpaces) { 3505 // Disable biased locking now as it interferes with the clean up of 3506 // the archived Klasses and Java string objects (at dump time only). 3507 UseBiasedLocking = false; 3508 } 3509 if (UseSharedSpaces && patch_mod_javabase) { 3510 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3511 } 3512 #endif 3513 3514 return JNI_OK; 3515 } 3516 3517 // Helper class for controlling the lifetime of JavaVMInitArgs 3518 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3519 // deleted on the destruction of the ScopedVMInitArgs object. 3520 class ScopedVMInitArgs : public StackObj { 3521 private: 3522 JavaVMInitArgs _args; 3523 char* _container_name; 3524 bool _is_set; 3525 char* _vm_options_file_arg; 3526 3527 public: 3528 ScopedVMInitArgs(const char *container_name) { 3529 _args.version = JNI_VERSION_1_2; 3530 _args.nOptions = 0; 3531 _args.options = NULL; 3532 _args.ignoreUnrecognized = false; 3533 _container_name = (char *)container_name; 3534 _is_set = false; 3535 _vm_options_file_arg = NULL; 3536 } 3537 3538 // Populates the JavaVMInitArgs object represented by this 3539 // ScopedVMInitArgs object with the arguments in options. The 3540 // allocated memory is deleted by the destructor. If this method 3541 // returns anything other than JNI_OK, then this object is in a 3542 // partially constructed state, and should be abandoned. 3543 jint set_args(GrowableArray<JavaVMOption>* options) { 3544 _is_set = true; 3545 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3546 JavaVMOption, options->length(), mtArguments); 3547 if (options_arr == NULL) { 3548 return JNI_ENOMEM; 3549 } 3550 _args.options = options_arr; 3551 3552 for (int i = 0; i < options->length(); i++) { 3553 options_arr[i] = options->at(i); 3554 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3555 if (options_arr[i].optionString == NULL) { 3556 // Rely on the destructor to do cleanup. 3557 _args.nOptions = i; 3558 return JNI_ENOMEM; 3559 } 3560 } 3561 3562 _args.nOptions = options->length(); 3563 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3564 return JNI_OK; 3565 } 3566 3567 JavaVMInitArgs* get() { return &_args; } 3568 char* container_name() { return _container_name; } 3569 bool is_set() { return _is_set; } 3570 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3571 char* vm_options_file_arg() { return _vm_options_file_arg; } 3572 3573 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3574 if (_vm_options_file_arg != NULL) { 3575 os::free(_vm_options_file_arg); 3576 } 3577 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3578 } 3579 3580 ~ScopedVMInitArgs() { 3581 if (_vm_options_file_arg != NULL) { 3582 os::free(_vm_options_file_arg); 3583 } 3584 if (_args.options == NULL) return; 3585 for (int i = 0; i < _args.nOptions; i++) { 3586 os::free(_args.options[i].optionString); 3587 } 3588 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3589 } 3590 3591 // Insert options into this option list, to replace option at 3592 // vm_options_file_pos (-XX:VMOptionsFile) 3593 jint insert(const JavaVMInitArgs* args, 3594 const JavaVMInitArgs* args_to_insert, 3595 const int vm_options_file_pos) { 3596 assert(_args.options == NULL, "shouldn't be set yet"); 3597 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3598 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3599 3600 int length = args->nOptions + args_to_insert->nOptions - 1; 3601 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3602 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3603 for (int i = 0; i < args->nOptions; i++) { 3604 if (i == vm_options_file_pos) { 3605 // insert the new options starting at the same place as the 3606 // -XX:VMOptionsFile option 3607 for (int j = 0; j < args_to_insert->nOptions; j++) { 3608 options->push(args_to_insert->options[j]); 3609 } 3610 } else { 3611 options->push(args->options[i]); 3612 } 3613 } 3614 // make into options array 3615 jint result = set_args(options); 3616 delete options; 3617 return result; 3618 } 3619 }; 3620 3621 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3622 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3623 } 3624 3625 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3626 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3627 } 3628 3629 jint Arguments::parse_options_environment_variable(const char* name, 3630 ScopedVMInitArgs* vm_args) { 3631 char *buffer = ::getenv(name); 3632 3633 // Don't check this environment variable if user has special privileges 3634 // (e.g. unix su command). 3635 if (buffer == NULL || os::have_special_privileges()) { 3636 return JNI_OK; 3637 } 3638 3639 if ((buffer = os::strdup(buffer)) == NULL) { 3640 return JNI_ENOMEM; 3641 } 3642 3643 jio_fprintf(defaultStream::error_stream(), 3644 "Picked up %s: %s\n", name, buffer); 3645 3646 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3647 3648 os::free(buffer); 3649 return retcode; 3650 } 3651 3652 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3653 // read file into buffer 3654 int fd = ::open(file_name, O_RDONLY); 3655 if (fd < 0) { 3656 jio_fprintf(defaultStream::error_stream(), 3657 "Could not open options file '%s'\n", 3658 file_name); 3659 return JNI_ERR; 3660 } 3661 3662 struct stat stbuf; 3663 int retcode = os::stat(file_name, &stbuf); 3664 if (retcode != 0) { 3665 jio_fprintf(defaultStream::error_stream(), 3666 "Could not stat options file '%s'\n", 3667 file_name); 3668 os::close(fd); 3669 return JNI_ERR; 3670 } 3671 3672 if (stbuf.st_size == 0) { 3673 // tell caller there is no option data and that is ok 3674 os::close(fd); 3675 return JNI_OK; 3676 } 3677 3678 // '+ 1' for NULL termination even with max bytes 3679 size_t bytes_alloc = stbuf.st_size + 1; 3680 3681 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3682 if (NULL == buf) { 3683 jio_fprintf(defaultStream::error_stream(), 3684 "Could not allocate read buffer for options file parse\n"); 3685 os::close(fd); 3686 return JNI_ENOMEM; 3687 } 3688 3689 memset(buf, 0, bytes_alloc); 3690 3691 // Fill buffer 3692 // Use ::read() instead of os::read because os::read() 3693 // might do a thread state transition 3694 // and it is too early for that here 3695 3696 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3697 os::close(fd); 3698 if (bytes_read < 0) { 3699 FREE_C_HEAP_ARRAY(char, buf); 3700 jio_fprintf(defaultStream::error_stream(), 3701 "Could not read options file '%s'\n", file_name); 3702 return JNI_ERR; 3703 } 3704 3705 if (bytes_read == 0) { 3706 // tell caller there is no option data and that is ok 3707 FREE_C_HEAP_ARRAY(char, buf); 3708 return JNI_OK; 3709 } 3710 3711 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3712 3713 FREE_C_HEAP_ARRAY(char, buf); 3714 return retcode; 3715 } 3716 3717 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3718 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3719 3720 // some pointers to help with parsing 3721 char *buffer_end = buffer + buf_len; 3722 char *opt_hd = buffer; 3723 char *wrt = buffer; 3724 char *rd = buffer; 3725 3726 // parse all options 3727 while (rd < buffer_end) { 3728 // skip leading white space from the input string 3729 while (rd < buffer_end && isspace(*rd)) { 3730 rd++; 3731 } 3732 3733 if (rd >= buffer_end) { 3734 break; 3735 } 3736 3737 // Remember this is where we found the head of the token. 3738 opt_hd = wrt; 3739 3740 // Tokens are strings of non white space characters separated 3741 // by one or more white spaces. 3742 while (rd < buffer_end && !isspace(*rd)) { 3743 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3744 int quote = *rd; // matching quote to look for 3745 rd++; // don't copy open quote 3746 while (rd < buffer_end && *rd != quote) { 3747 // include everything (even spaces) 3748 // up until the close quote 3749 *wrt++ = *rd++; // copy to option string 3750 } 3751 3752 if (rd < buffer_end) { 3753 rd++; // don't copy close quote 3754 } else { 3755 // did not see closing quote 3756 jio_fprintf(defaultStream::error_stream(), 3757 "Unmatched quote in %s\n", name); 3758 delete options; 3759 return JNI_ERR; 3760 } 3761 } else { 3762 *wrt++ = *rd++; // copy to option string 3763 } 3764 } 3765 3766 // steal a white space character and set it to NULL 3767 *wrt++ = '\0'; 3768 // We now have a complete token 3769 3770 JavaVMOption option; 3771 option.optionString = opt_hd; 3772 option.extraInfo = NULL; 3773 3774 options->append(option); // Fill in option 3775 3776 rd++; // Advance to next character 3777 } 3778 3779 // Fill out JavaVMInitArgs structure. 3780 jint status = vm_args->set_args(options); 3781 3782 delete options; 3783 return status; 3784 } 3785 3786 void Arguments::set_shared_spaces_flags() { 3787 if (DumpSharedSpaces) { 3788 if (FailOverToOldVerifier) { 3789 // Don't fall back to the old verifier on verification failure. If a 3790 // class fails verification with the split verifier, it might fail the 3791 // CDS runtime verifier constraint check. In that case, we don't want 3792 // to share the class. We only archive classes that pass the split verifier. 3793 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3794 } 3795 3796 if (RequireSharedSpaces) { 3797 warning("Cannot dump shared archive while using shared archive"); 3798 } 3799 UseSharedSpaces = false; 3800 #ifdef _LP64 3801 if (!UseCompressedOops || !UseCompressedClassPointers) { 3802 vm_exit_during_initialization( 3803 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3804 } 3805 } else { 3806 if (!UseCompressedOops || !UseCompressedClassPointers) { 3807 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3808 } 3809 #endif 3810 } 3811 } 3812 3813 // Sharing support 3814 // Construct the path to the archive 3815 static char* get_shared_archive_path() { 3816 char *shared_archive_path; 3817 if (SharedArchiveFile == NULL) { 3818 char jvm_path[JVM_MAXPATHLEN]; 3819 os::jvm_path(jvm_path, sizeof(jvm_path)); 3820 char *end = strrchr(jvm_path, *os::file_separator()); 3821 if (end != NULL) *end = '\0'; 3822 size_t jvm_path_len = strlen(jvm_path); 3823 size_t file_sep_len = strlen(os::file_separator()); 3824 const size_t len = jvm_path_len + file_sep_len + 20; 3825 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3826 if (shared_archive_path != NULL) { 3827 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3828 jvm_path, os::file_separator()); 3829 } 3830 } else { 3831 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3832 } 3833 return shared_archive_path; 3834 } 3835 3836 #ifndef PRODUCT 3837 // Determine whether LogVMOutput should be implicitly turned on. 3838 static bool use_vm_log() { 3839 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3840 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3841 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3842 PrintAssembly || TraceDeoptimization || TraceDependencies || 3843 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3844 return true; 3845 } 3846 3847 #ifdef COMPILER1 3848 if (PrintC1Statistics) { 3849 return true; 3850 } 3851 #endif // COMPILER1 3852 3853 #ifdef COMPILER2 3854 if (PrintOptoAssembly || PrintOptoStatistics) { 3855 return true; 3856 } 3857 #endif // COMPILER2 3858 3859 return false; 3860 } 3861 3862 #endif // PRODUCT 3863 3864 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3865 for (int index = 0; index < args->nOptions; index++) { 3866 const JavaVMOption* option = args->options + index; 3867 const char* tail; 3868 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3869 return true; 3870 } 3871 } 3872 return false; 3873 } 3874 3875 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3876 const char* vm_options_file, 3877 const int vm_options_file_pos, 3878 ScopedVMInitArgs* vm_options_file_args, 3879 ScopedVMInitArgs* args_out) { 3880 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3881 if (code != JNI_OK) { 3882 return code; 3883 } 3884 3885 if (vm_options_file_args->get()->nOptions < 1) { 3886 return JNI_OK; 3887 } 3888 3889 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3890 jio_fprintf(defaultStream::error_stream(), 3891 "A VM options file may not refer to a VM options file. " 3892 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3893 "options file '%s' in options container '%s' is an error.\n", 3894 vm_options_file_args->vm_options_file_arg(), 3895 vm_options_file_args->container_name()); 3896 return JNI_EINVAL; 3897 } 3898 3899 return args_out->insert(args, vm_options_file_args->get(), 3900 vm_options_file_pos); 3901 } 3902 3903 // Expand -XX:VMOptionsFile found in args_in as needed. 3904 // mod_args and args_out parameters may return values as needed. 3905 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3906 ScopedVMInitArgs* mod_args, 3907 JavaVMInitArgs** args_out) { 3908 jint code = match_special_option_and_act(args_in, mod_args); 3909 if (code != JNI_OK) { 3910 return code; 3911 } 3912 3913 if (mod_args->is_set()) { 3914 // args_in contains -XX:VMOptionsFile and mod_args contains the 3915 // original options from args_in along with the options expanded 3916 // from the VMOptionsFile. Return a short-hand to the caller. 3917 *args_out = mod_args->get(); 3918 } else { 3919 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3920 } 3921 return JNI_OK; 3922 } 3923 3924 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3925 ScopedVMInitArgs* args_out) { 3926 // Remaining part of option string 3927 const char* tail; 3928 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3929 3930 for (int index = 0; index < args->nOptions; index++) { 3931 const JavaVMOption* option = args->options + index; 3932 if (ArgumentsExt::process_options(option)) { 3933 continue; 3934 } 3935 if (match_option(option, "-XX:Flags=", &tail)) { 3936 Arguments::set_jvm_flags_file(tail); 3937 continue; 3938 } 3939 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3940 if (vm_options_file_args.found_vm_options_file_arg()) { 3941 jio_fprintf(defaultStream::error_stream(), 3942 "The option '%s' is already specified in the options " 3943 "container '%s' so the specification of '%s' in the " 3944 "same options container is an error.\n", 3945 vm_options_file_args.vm_options_file_arg(), 3946 vm_options_file_args.container_name(), 3947 option->optionString); 3948 return JNI_EINVAL; 3949 } 3950 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3951 // If there's a VMOptionsFile, parse that 3952 jint code = insert_vm_options_file(args, tail, index, 3953 &vm_options_file_args, args_out); 3954 if (code != JNI_OK) { 3955 return code; 3956 } 3957 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3958 if (args_out->is_set()) { 3959 // The VMOptions file inserted some options so switch 'args' 3960 // to the new set of options, and continue processing which 3961 // preserves "last option wins" semantics. 3962 args = args_out->get(); 3963 // The first option from the VMOptionsFile replaces the 3964 // current option. So we back track to process the 3965 // replacement option. 3966 index--; 3967 } 3968 continue; 3969 } 3970 if (match_option(option, "-XX:+PrintVMOptions")) { 3971 PrintVMOptions = true; 3972 continue; 3973 } 3974 if (match_option(option, "-XX:-PrintVMOptions")) { 3975 PrintVMOptions = false; 3976 continue; 3977 } 3978 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3979 IgnoreUnrecognizedVMOptions = true; 3980 continue; 3981 } 3982 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3983 IgnoreUnrecognizedVMOptions = false; 3984 continue; 3985 } 3986 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3987 CommandLineFlags::printFlags(tty, false); 3988 vm_exit(0); 3989 } 3990 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3991 #if INCLUDE_NMT 3992 // The launcher did not setup nmt environment variable properly. 3993 if (!MemTracker::check_launcher_nmt_support(tail)) { 3994 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3995 } 3996 3997 // Verify if nmt option is valid. 3998 if (MemTracker::verify_nmt_option()) { 3999 // Late initialization, still in single-threaded mode. 4000 if (MemTracker::tracking_level() >= NMT_summary) { 4001 MemTracker::init(); 4002 } 4003 } else { 4004 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4005 } 4006 continue; 4007 #else 4008 jio_fprintf(defaultStream::error_stream(), 4009 "Native Memory Tracking is not supported in this VM\n"); 4010 return JNI_ERR; 4011 #endif 4012 } 4013 4014 #ifndef PRODUCT 4015 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4016 CommandLineFlags::printFlags(tty, true); 4017 vm_exit(0); 4018 } 4019 #endif 4020 4021 if (match_option(option, "-XX:+UseAppCDS")) { 4022 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true); 4023 if (flag->is_diagnostic()) { 4024 flag->clear_diagnostic(); 4025 } 4026 continue; 4027 } 4028 } 4029 return JNI_OK; 4030 } 4031 4032 static void print_options(const JavaVMInitArgs *args) { 4033 const char* tail; 4034 for (int index = 0; index < args->nOptions; index++) { 4035 const JavaVMOption *option = args->options + index; 4036 if (match_option(option, "-XX:", &tail)) { 4037 logOption(tail); 4038 } 4039 } 4040 } 4041 4042 bool Arguments::handle_deprecated_print_gc_flags() { 4043 if (PrintGC) { 4044 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4045 } 4046 if (PrintGCDetails) { 4047 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4048 } 4049 4050 if (_gc_log_filename != NULL) { 4051 // -Xloggc was used to specify a filename 4052 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4053 4054 LogTarget(Error, logging) target; 4055 LogStream errstream(target); 4056 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4057 } else if (PrintGC || PrintGCDetails) { 4058 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4059 } 4060 return true; 4061 } 4062 4063 void Arguments::handle_extra_cms_flags(const char* msg) { 4064 SpecialFlag flag; 4065 const char *flag_name = "UseConcMarkSweepGC"; 4066 if (lookup_special_flag(flag_name, flag)) { 4067 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4068 warning("%s", msg); 4069 } 4070 } 4071 4072 // Parse entry point called from JNI_CreateJavaVM 4073 4074 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4075 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4076 4077 // Initialize ranges, constraints and writeables 4078 CommandLineFlagRangeList::init(); 4079 CommandLineFlagConstraintList::init(); 4080 CommandLineFlagWriteableList::init(); 4081 4082 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4083 const char* hotspotrc = ".hotspotrc"; 4084 bool settings_file_specified = false; 4085 bool needs_hotspotrc_warning = false; 4086 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4087 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4088 4089 // Pointers to current working set of containers 4090 JavaVMInitArgs* cur_cmd_args; 4091 JavaVMInitArgs* cur_java_options_args; 4092 JavaVMInitArgs* cur_java_tool_options_args; 4093 4094 // Containers for modified/expanded options 4095 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4096 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4097 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4098 4099 4100 jint code = 4101 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4102 if (code != JNI_OK) { 4103 return code; 4104 } 4105 4106 code = parse_java_options_environment_variable(&initial_java_options_args); 4107 if (code != JNI_OK) { 4108 return code; 4109 } 4110 4111 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4112 &mod_java_tool_options_args, 4113 &cur_java_tool_options_args); 4114 if (code != JNI_OK) { 4115 return code; 4116 } 4117 4118 code = expand_vm_options_as_needed(initial_cmd_args, 4119 &mod_cmd_args, 4120 &cur_cmd_args); 4121 if (code != JNI_OK) { 4122 return code; 4123 } 4124 4125 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4126 &mod_java_options_args, 4127 &cur_java_options_args); 4128 if (code != JNI_OK) { 4129 return code; 4130 } 4131 4132 const char* flags_file = Arguments::get_jvm_flags_file(); 4133 settings_file_specified = (flags_file != NULL); 4134 4135 if (IgnoreUnrecognizedVMOptions) { 4136 cur_cmd_args->ignoreUnrecognized = true; 4137 cur_java_tool_options_args->ignoreUnrecognized = true; 4138 cur_java_options_args->ignoreUnrecognized = true; 4139 } 4140 4141 // Parse specified settings file 4142 if (settings_file_specified) { 4143 if (!process_settings_file(flags_file, true, 4144 cur_cmd_args->ignoreUnrecognized)) { 4145 return JNI_EINVAL; 4146 } 4147 } else { 4148 #ifdef ASSERT 4149 // Parse default .hotspotrc settings file 4150 if (!process_settings_file(".hotspotrc", false, 4151 cur_cmd_args->ignoreUnrecognized)) { 4152 return JNI_EINVAL; 4153 } 4154 #else 4155 struct stat buf; 4156 if (os::stat(hotspotrc, &buf) == 0) { 4157 needs_hotspotrc_warning = true; 4158 } 4159 #endif 4160 } 4161 4162 if (PrintVMOptions) { 4163 print_options(cur_java_tool_options_args); 4164 print_options(cur_cmd_args); 4165 print_options(cur_java_options_args); 4166 } 4167 4168 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4169 jint result = parse_vm_init_args(cur_java_tool_options_args, 4170 cur_java_options_args, 4171 cur_cmd_args); 4172 4173 if (result != JNI_OK) { 4174 return result; 4175 } 4176 4177 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4178 SharedArchivePath = get_shared_archive_path(); 4179 if (SharedArchivePath == NULL) { 4180 return JNI_ENOMEM; 4181 } 4182 4183 // Set up VerifySharedSpaces 4184 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4185 VerifySharedSpaces = true; 4186 } 4187 4188 // Delay warning until here so that we've had a chance to process 4189 // the -XX:-PrintWarnings flag 4190 if (needs_hotspotrc_warning) { 4191 warning("%s file is present but has been ignored. " 4192 "Run with -XX:Flags=%s to load the file.", 4193 hotspotrc, hotspotrc); 4194 } 4195 4196 if (needs_module_property_warning) { 4197 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4198 " names that are reserved for internal use."); 4199 } 4200 4201 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4202 UNSUPPORTED_OPTION(UseLargePages); 4203 #endif 4204 4205 ArgumentsExt::report_unsupported_options(); 4206 4207 #ifndef PRODUCT 4208 if (TraceBytecodesAt != 0) { 4209 TraceBytecodes = true; 4210 } 4211 if (CountCompiledCalls) { 4212 if (UseCounterDecay) { 4213 warning("UseCounterDecay disabled because CountCalls is set"); 4214 UseCounterDecay = false; 4215 } 4216 } 4217 #endif // PRODUCT 4218 4219 if (ScavengeRootsInCode == 0) { 4220 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4221 warning("Forcing ScavengeRootsInCode non-zero"); 4222 } 4223 ScavengeRootsInCode = 1; 4224 } 4225 4226 if (!handle_deprecated_print_gc_flags()) { 4227 return JNI_EINVAL; 4228 } 4229 4230 // Set object alignment values. 4231 set_object_alignment(); 4232 4233 #if !INCLUDE_CDS 4234 if (DumpSharedSpaces || RequireSharedSpaces) { 4235 jio_fprintf(defaultStream::error_stream(), 4236 "Shared spaces are not supported in this VM\n"); 4237 return JNI_ERR; 4238 } 4239 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 4240 log_is_enabled(Info, cds)) { 4241 warning("Shared spaces are not supported in this VM"); 4242 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4243 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4244 } 4245 no_shared_spaces("CDS Disabled"); 4246 #endif // INCLUDE_CDS 4247 4248 return JNI_OK; 4249 } 4250 4251 jint Arguments::apply_ergo() { 4252 // Set flags based on ergonomics. 4253 jint result = set_ergonomics_flags(); 4254 if (result != JNI_OK) return result; 4255 4256 #if INCLUDE_JVMCI 4257 set_jvmci_specific_flags(); 4258 #endif 4259 4260 set_shared_spaces_flags(); 4261 4262 // Check the GC selections again. 4263 if (!check_gc_consistency()) { 4264 return JNI_EINVAL; 4265 } 4266 4267 if (TieredCompilation) { 4268 set_tiered_flags(); 4269 } else { 4270 int max_compilation_policy_choice = 1; 4271 #ifdef COMPILER2 4272 if (is_server_compilation_mode_vm()) { 4273 max_compilation_policy_choice = 2; 4274 } 4275 #endif 4276 // Check if the policy is valid. 4277 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4278 vm_exit_during_initialization( 4279 "Incompatible compilation policy selected", NULL); 4280 } 4281 // Scale CompileThreshold 4282 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4283 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4284 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4285 } 4286 } 4287 4288 #ifdef COMPILER2 4289 #ifndef PRODUCT 4290 if (PrintIdealGraphLevel > 0) { 4291 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4292 } 4293 #endif 4294 #endif 4295 4296 // Set heap size based on available physical memory 4297 set_heap_size(); 4298 4299 ArgumentsExt::set_gc_specific_flags(); 4300 4301 // Initialize Metaspace flags and alignments 4302 Metaspace::ergo_initialize(); 4303 4304 // Set bytecode rewriting flags 4305 set_bytecode_flags(); 4306 4307 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4308 jint code = set_aggressive_opts_flags(); 4309 if (code != JNI_OK) { 4310 return code; 4311 } 4312 4313 // Turn off biased locking for locking debug mode flags, 4314 // which are subtly different from each other but neither works with 4315 // biased locking 4316 if (UseHeavyMonitors 4317 #ifdef COMPILER1 4318 || !UseFastLocking 4319 #endif // COMPILER1 4320 #if INCLUDE_JVMCI 4321 || !JVMCIUseFastLocking 4322 #endif 4323 ) { 4324 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4325 // flag set to true on command line; warn the user that they 4326 // can't enable biased locking here 4327 warning("Biased Locking is not supported with locking debug flags" 4328 "; ignoring UseBiasedLocking flag." ); 4329 } 4330 UseBiasedLocking = false; 4331 } 4332 4333 #ifdef CC_INTERP 4334 // Clear flags not supported on zero. 4335 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4336 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4337 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4338 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4339 #endif // CC_INTERP 4340 4341 #ifdef COMPILER2 4342 if (!EliminateLocks) { 4343 EliminateNestedLocks = false; 4344 } 4345 if (!Inline) { 4346 IncrementalInline = false; 4347 } 4348 #ifndef PRODUCT 4349 if (!IncrementalInline) { 4350 AlwaysIncrementalInline = false; 4351 } 4352 #endif 4353 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4354 // nothing to use the profiling, turn if off 4355 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4356 } 4357 #endif 4358 4359 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4360 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4361 DebugNonSafepoints = true; 4362 } 4363 4364 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4365 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4366 } 4367 4368 if (UseOnStackReplacement && !UseLoopCounter) { 4369 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4370 FLAG_SET_DEFAULT(UseLoopCounter, true); 4371 } 4372 4373 #ifndef PRODUCT 4374 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4375 if (use_vm_log()) { 4376 LogVMOutput = true; 4377 } 4378 } 4379 #endif // PRODUCT 4380 4381 if (PrintCommandLineFlags) { 4382 CommandLineFlags::printSetFlags(tty); 4383 } 4384 4385 // Apply CPU specific policy for the BiasedLocking 4386 if (UseBiasedLocking) { 4387 if (!VM_Version::use_biased_locking() && 4388 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4389 UseBiasedLocking = false; 4390 } 4391 } 4392 #ifdef COMPILER2 4393 if (!UseBiasedLocking || EmitSync != 0) { 4394 UseOptoBiasInlining = false; 4395 } 4396 #endif 4397 4398 // ThreadLocalHandshakesConstraintFunc handles the constraints. 4399 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 4400 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4401 } else { 4402 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4403 } 4404 4405 return JNI_OK; 4406 } 4407 4408 jint Arguments::adjust_after_os() { 4409 if (UseNUMA) { 4410 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4411 FLAG_SET_ERGO(bool, UseNUMA, false); 4412 } else if (UseParallelGC || UseParallelOldGC) { 4413 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4414 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4415 } 4416 } 4417 // UseNUMAInterleaving is set to ON for all collectors and 4418 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4419 // such as the parallel collector for Linux and Solaris will 4420 // interleave old gen and survivor spaces on top of NUMA 4421 // allocation policy for the eden space. 4422 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4423 // all platforms and ParallelGC on Windows will interleave all 4424 // of the heap spaces across NUMA nodes. 4425 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4426 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4427 } 4428 } 4429 return JNI_OK; 4430 } 4431 4432 int Arguments::PropertyList_count(SystemProperty* pl) { 4433 int count = 0; 4434 while(pl != NULL) { 4435 count++; 4436 pl = pl->next(); 4437 } 4438 return count; 4439 } 4440 4441 // Return the number of readable properties. 4442 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4443 int count = 0; 4444 while(pl != NULL) { 4445 if (pl->is_readable()) { 4446 count++; 4447 } 4448 pl = pl->next(); 4449 } 4450 return count; 4451 } 4452 4453 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4454 assert(key != NULL, "just checking"); 4455 SystemProperty* prop; 4456 for (prop = pl; prop != NULL; prop = prop->next()) { 4457 if (strcmp(key, prop->key()) == 0) return prop->value(); 4458 } 4459 return NULL; 4460 } 4461 4462 // Return the value of the requested property provided that it is a readable property. 4463 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4464 assert(key != NULL, "just checking"); 4465 SystemProperty* prop; 4466 // Return the property value if the keys match and the property is not internal or 4467 // it's the special internal property "jdk.boot.class.path.append". 4468 for (prop = pl; prop != NULL; prop = prop->next()) { 4469 if (strcmp(key, prop->key()) == 0) { 4470 if (!prop->internal()) { 4471 return prop->value(); 4472 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4473 return prop->value(); 4474 } else { 4475 // Property is internal and not jdk.boot.class.path.append so return NULL. 4476 return NULL; 4477 } 4478 } 4479 } 4480 return NULL; 4481 } 4482 4483 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4484 int count = 0; 4485 const char* ret_val = NULL; 4486 4487 while(pl != NULL) { 4488 if(count >= index) { 4489 ret_val = pl->key(); 4490 break; 4491 } 4492 count++; 4493 pl = pl->next(); 4494 } 4495 4496 return ret_val; 4497 } 4498 4499 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4500 int count = 0; 4501 char* ret_val = NULL; 4502 4503 while(pl != NULL) { 4504 if(count >= index) { 4505 ret_val = pl->value(); 4506 break; 4507 } 4508 count++; 4509 pl = pl->next(); 4510 } 4511 4512 return ret_val; 4513 } 4514 4515 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4516 SystemProperty* p = *plist; 4517 if (p == NULL) { 4518 *plist = new_p; 4519 } else { 4520 while (p->next() != NULL) { 4521 p = p->next(); 4522 } 4523 p->set_next(new_p); 4524 } 4525 } 4526 4527 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4528 bool writeable, bool internal) { 4529 if (plist == NULL) 4530 return; 4531 4532 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4533 PropertyList_add(plist, new_p); 4534 } 4535 4536 void Arguments::PropertyList_add(SystemProperty *element) { 4537 PropertyList_add(&_system_properties, element); 4538 } 4539 4540 // This add maintains unique property key in the list. 4541 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4542 PropertyAppendable append, PropertyWriteable writeable, 4543 PropertyInternal internal) { 4544 if (plist == NULL) 4545 return; 4546 4547 // If property key exist then update with new value. 4548 SystemProperty* prop; 4549 for (prop = *plist; prop != NULL; prop = prop->next()) { 4550 if (strcmp(k, prop->key()) == 0) { 4551 if (append == AppendProperty) { 4552 prop->append_value(v); 4553 } else { 4554 prop->set_value(v); 4555 } 4556 return; 4557 } 4558 } 4559 4560 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4561 } 4562 4563 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4564 // Returns true if all of the source pointed by src has been copied over to 4565 // the destination buffer pointed by buf. Otherwise, returns false. 4566 // Notes: 4567 // 1. If the length (buflen) of the destination buffer excluding the 4568 // NULL terminator character is not long enough for holding the expanded 4569 // pid characters, it also returns false instead of returning the partially 4570 // expanded one. 4571 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4572 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4573 char* buf, size_t buflen) { 4574 const char* p = src; 4575 char* b = buf; 4576 const char* src_end = &src[srclen]; 4577 char* buf_end = &buf[buflen - 1]; 4578 4579 while (p < src_end && b < buf_end) { 4580 if (*p == '%') { 4581 switch (*(++p)) { 4582 case '%': // "%%" ==> "%" 4583 *b++ = *p++; 4584 break; 4585 case 'p': { // "%p" ==> current process id 4586 // buf_end points to the character before the last character so 4587 // that we could write '\0' to the end of the buffer. 4588 size_t buf_sz = buf_end - b + 1; 4589 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4590 4591 // if jio_snprintf fails or the buffer is not long enough to hold 4592 // the expanded pid, returns false. 4593 if (ret < 0 || ret >= (int)buf_sz) { 4594 return false; 4595 } else { 4596 b += ret; 4597 assert(*b == '\0', "fail in copy_expand_pid"); 4598 if (p == src_end && b == buf_end + 1) { 4599 // reach the end of the buffer. 4600 return true; 4601 } 4602 } 4603 p++; 4604 break; 4605 } 4606 default : 4607 *b++ = '%'; 4608 } 4609 } else { 4610 *b++ = *p++; 4611 } 4612 } 4613 *b = '\0'; 4614 return (p == src_end); // return false if not all of the source was copied 4615 }