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 #ifdef VENDOR_URL_VM_BUG 67 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 68 #else 69 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 70 #endif 71 #define DEFAULT_JAVA_LAUNCHER "generic" 72 73 char* Arguments::_jvm_flags_file = NULL; 74 char** Arguments::_jvm_flags_array = NULL; 75 int Arguments::_num_jvm_flags = 0; 76 char** Arguments::_jvm_args_array = NULL; 77 int Arguments::_num_jvm_args = 0; 78 char* Arguments::_java_command = NULL; 79 SystemProperty* Arguments::_system_properties = NULL; 80 const char* Arguments::_gc_log_filename = NULL; 81 size_t Arguments::_conservative_max_heap_alignment = 0; 82 size_t Arguments::_min_heap_size = 0; 83 Arguments::Mode Arguments::_mode = _mixed; 84 bool Arguments::_java_compiler = false; 85 bool Arguments::_xdebug_mode = false; 86 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 88 int Arguments::_sun_java_launcher_pid = -1; 89 bool Arguments::_sun_java_launcher_is_altjvm = false; 90 91 // These parameters are reset in method parse_vm_init_args() 92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 94 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 95 bool Arguments::_ClipInlining = ClipInlining; 96 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 97 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 98 99 char* Arguments::SharedArchivePath = NULL; 100 101 AgentLibraryList Arguments::_libraryList; 102 AgentLibraryList Arguments::_agentList; 103 104 abort_hook_t Arguments::_abort_hook = NULL; 105 exit_hook_t Arguments::_exit_hook = NULL; 106 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 107 108 109 SystemProperty *Arguments::_sun_boot_library_path = NULL; 110 SystemProperty *Arguments::_java_library_path = NULL; 111 SystemProperty *Arguments::_java_home = NULL; 112 SystemProperty *Arguments::_java_class_path = NULL; 113 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 114 115 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 116 PathString *Arguments::_system_boot_class_path = NULL; 117 bool Arguments::_has_jimage = false; 118 119 char* Arguments::_ext_dirs = NULL; 120 121 bool PathString::set_value(const char *value) { 122 if (_value != NULL) { 123 FreeHeap(_value); 124 } 125 _value = AllocateHeap(strlen(value)+1, mtArguments); 126 assert(_value != NULL, "Unable to allocate space for new path value"); 127 if (_value != NULL) { 128 strcpy(_value, value); 129 } else { 130 // not able to allocate 131 return false; 132 } 133 return true; 134 } 135 136 void PathString::append_value(const char *value) { 137 char *sp; 138 size_t len = 0; 139 if (value != NULL) { 140 len = strlen(value); 141 if (_value != NULL) { 142 len += strlen(_value); 143 } 144 sp = AllocateHeap(len+2, mtArguments); 145 assert(sp != NULL, "Unable to allocate space for new append path value"); 146 if (sp != NULL) { 147 if (_value != NULL) { 148 strcpy(sp, _value); 149 strcat(sp, os::path_separator()); 150 strcat(sp, value); 151 FreeHeap(_value); 152 } else { 153 strcpy(sp, value); 154 } 155 _value = sp; 156 } 157 } 158 } 159 160 PathString::PathString(const char* value) { 161 if (value == NULL) { 162 _value = NULL; 163 } else { 164 _value = AllocateHeap(strlen(value)+1, mtArguments); 165 strcpy(_value, value); 166 } 167 } 168 169 PathString::~PathString() { 170 if (_value != NULL) { 171 FreeHeap(_value); 172 _value = NULL; 173 } 174 } 175 176 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 177 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 178 size_t len = strlen(module_name) + 1; 179 _module_name = AllocateHeap(len, mtInternal); 180 strncpy(_module_name, module_name, len); // copy the trailing null 181 _path = new PathString(path); 182 } 183 184 ModulePatchPath::~ModulePatchPath() { 185 if (_module_name != NULL) { 186 FreeHeap(_module_name); 187 _module_name = NULL; 188 } 189 if (_path != NULL) { 190 delete _path; 191 _path = NULL; 192 } 193 } 194 195 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 196 if (key == NULL) { 197 _key = NULL; 198 } else { 199 _key = AllocateHeap(strlen(key)+1, mtArguments); 200 strcpy(_key, key); 201 } 202 _next = NULL; 203 _internal = internal; 204 _writeable = writeable; 205 } 206 207 AgentLibrary::AgentLibrary(const char* name, const char* options, bool is_absolute_path, void* os_lib) { 208 _name = AllocateHeap(strlen(name)+1, mtArguments); 209 strcpy(_name, name); 210 if (options == NULL) { 211 _options = NULL; 212 } else { 213 _options = AllocateHeap(strlen(options)+1, mtArguments); 214 strcpy(_options, options); 215 } 216 _is_absolute_path = is_absolute_path; 217 _os_lib = os_lib; 218 _next = NULL; 219 _state = agent_invalid; 220 _is_static_lib = false; 221 } 222 223 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 224 // part of the option string. 225 static bool match_option(const JavaVMOption *option, const char* name, 226 const char** tail) { 227 size_t len = strlen(name); 228 if (strncmp(option->optionString, name, len) == 0) { 229 *tail = option->optionString + len; 230 return true; 231 } else { 232 return false; 233 } 234 } 235 236 // Check if 'option' matches 'name'. No "tail" is allowed. 237 static bool match_option(const JavaVMOption *option, const char* name) { 238 const char* tail = NULL; 239 bool result = match_option(option, name, &tail); 240 if (tail != NULL && *tail == '\0') { 241 return result; 242 } else { 243 return false; 244 } 245 } 246 247 // Return true if any of the strings in null-terminated array 'names' matches. 248 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 249 // the option must match exactly. 250 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 251 bool tail_allowed) { 252 for (/* empty */; *names != NULL; ++names) { 253 if (match_option(option, *names, tail)) { 254 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 255 return true; 256 } 257 } 258 } 259 return false; 260 } 261 262 static void logOption(const char* opt) { 263 if (PrintVMOptions) { 264 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 265 } 266 } 267 268 bool needs_module_property_warning = false; 269 270 #define MODULE_PROPERTY_PREFIX "jdk.module." 271 #define MODULE_PROPERTY_PREFIX_LEN 11 272 #define ADDEXPORTS "addexports" 273 #define ADDEXPORTS_LEN 10 274 #define ADDREADS "addreads" 275 #define ADDREADS_LEN 8 276 #define ADDOPENS "addopens" 277 #define ADDOPENS_LEN 8 278 #define PATCH "patch" 279 #define PATCH_LEN 5 280 #define ADDMODS "addmods" 281 #define ADDMODS_LEN 7 282 #define LIMITMODS "limitmods" 283 #define LIMITMODS_LEN 9 284 #define PATH "path" 285 #define PATH_LEN 4 286 #define UPGRADE_PATH "upgrade.path" 287 #define UPGRADE_PATH_LEN 12 288 289 void Arguments::add_init_library(const char* name, char* options) { 290 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 291 } 292 293 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 294 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 295 } 296 297 // Late-binding agents not started via arguments 298 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 299 _agentList.add(agentLib); 300 } 301 302 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) { 303 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib)); 304 } 305 306 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 307 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 308 return ((strncmp(option, property, len) == 0) && 309 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 310 } 311 312 // Return true if property starts with "jdk.module." and its ensuing chars match 313 // any of the reserved module properties. 314 // property should be passed without the leading "-D". 315 bool Arguments::is_internal_module_property(const char* property) { 316 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 317 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 318 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 319 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 320 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 321 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 322 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 323 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 324 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 325 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 326 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 327 return true; 328 } 329 } 330 return false; 331 } 332 333 // Process java launcher properties. 334 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 335 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 336 // sun.java.launcher.pid is defined. 337 // Must do this before setting up other system properties, 338 // as some of them may depend on launcher type. 339 for (int index = 0; index < args->nOptions; index++) { 340 const JavaVMOption* option = args->options + index; 341 const char* tail; 342 343 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 344 process_java_launcher_argument(tail, option->extraInfo); 345 continue; 346 } 347 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 348 if (strcmp(tail, "true") == 0) { 349 _sun_java_launcher_is_altjvm = true; 350 } 351 continue; 352 } 353 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 354 _sun_java_launcher_pid = atoi(tail); 355 continue; 356 } 357 } 358 } 359 360 // Initialize system properties key and value. 361 void Arguments::init_system_properties() { 362 363 // Set up _system_boot_class_path which is not a property but 364 // relies heavily on argument processing and the jdk.boot.class.path.append 365 // property. It is used to store the underlying system boot class path. 366 _system_boot_class_path = new PathString(NULL); 367 368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 369 "Java Virtual Machine Specification", false)); 370 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 371 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 372 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 373 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 374 375 // Following are JVMTI agent writable properties. 376 // Properties values are set to NULL and they are 377 // os specific they are initialized in os::init_system_properties_values(). 378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 379 _java_library_path = new SystemProperty("java.library.path", NULL, true); 380 _java_home = new SystemProperty("java.home", NULL, true); 381 _java_class_path = new SystemProperty("java.class.path", "", true); 382 // jdk.boot.class.path.append is a non-writeable, internal property. 383 // It can only be set by either: 384 // - -Xbootclasspath/a: 385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 387 388 // Add to System Property list. 389 PropertyList_add(&_system_properties, _sun_boot_library_path); 390 PropertyList_add(&_system_properties, _java_library_path); 391 PropertyList_add(&_system_properties, _java_home); 392 PropertyList_add(&_system_properties, _java_class_path); 393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 394 395 // Set OS specific system properties values 396 os::init_system_properties_values(); 397 } 398 399 // Update/Initialize System properties after JDK version number is known 400 void Arguments::init_version_specific_system_properties() { 401 enum { bufsz = 16 }; 402 char buffer[bufsz]; 403 const char* spec_vendor = "Oracle Corporation"; 404 uint32_t spec_version = JDK_Version::current().major_version(); 405 406 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 407 408 PropertyList_add(&_system_properties, 409 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 410 PropertyList_add(&_system_properties, 411 new SystemProperty("java.vm.specification.version", buffer, false)); 412 PropertyList_add(&_system_properties, 413 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 414 } 415 416 /* 417 * -XX argument processing: 418 * 419 * -XX arguments are defined in several places, such as: 420 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 421 * -XX arguments are parsed in parse_argument(). 422 * -XX argument bounds checking is done in check_vm_args_consistency(). 423 * 424 * Over time -XX arguments may change. There are mechanisms to handle common cases: 425 * 426 * ALIASED: An option that is simply another name for another option. This is often 427 * part of the process of deprecating a flag, but not all aliases need 428 * to be deprecated. 429 * 430 * Create an alias for an option by adding the old and new option names to the 431 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 432 * 433 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 434 * support may be removed in the future. Both regular and aliased options may be 435 * deprecated. 436 * 437 * Add a deprecation warning for an option (or alias) by adding an entry in the 438 * "special_jvm_flags" table and setting the "deprecated_in" field. 439 * Often an option "deprecated" in one major release will 440 * be made "obsolete" in the next. In this case the entry should also have its 441 * "obsolete_in" field set. 442 * 443 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 444 * on the command line. A warning is printed to let the user know that option might not 445 * be accepted in the future. 446 * 447 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 448 * table and setting the "obsolete_in" field. 449 * 450 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 451 * to the current JDK version. The system will flatly refuse to admit the existence of 452 * the flag. This allows a flag to die automatically over JDK releases. 453 * 454 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 455 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 456 * - Newly obsolete or expired deprecated options should have their global variable 457 * definitions removed (from globals.hpp, etc) and related implementations removed. 458 * 459 * Recommended approach for removing options: 460 * 461 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 462 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 463 * 464 * To remove internal options (e.g. diagnostic, experimental, develop options), use 465 * a 2-step model adding major release numbers to the obsolete and expire columns. 466 * 467 * To change the name of an option, use the alias table as well as a 2-step 468 * model adding major release numbers to the deprecate and expire columns. 469 * Think twice about aliasing commonly used customer options. 470 * 471 * There are times when it is appropriate to leave a future release number as undefined. 472 * 473 * Tests: Aliases should be tested in VMAliasOptions.java. 474 * Deprecated options should be tested in VMDeprecatedOptions.java. 475 */ 476 477 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 478 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 479 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 480 // the command-line as usual, but will issue a warning. 481 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 482 // the command-line, while issuing a warning and ignoring the flag value. 483 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 484 // existence of the flag. 485 // 486 // MANUAL CLEANUP ON JDK VERSION UPDATES: 487 // This table ensures that the handling of options will update automatically when the JDK 488 // version is incremented, but the source code needs to be cleanup up manually: 489 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 490 // variable should be removed, as well as users of the variable. 491 // - As "deprecated" options age into "obsolete" options, move the entry into the 492 // "Obsolete Flags" section of the table. 493 // - All expired options should be removed from the table. 494 static SpecialFlag const special_jvm_flags[] = { 495 // -------------- Deprecated Flags -------------- 496 // --- Non-alias flags - sorted by obsolete_in then expired_in: 497 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 498 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 499 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() }, 500 { "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() }, 501 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 502 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 503 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 504 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 505 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 506 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 507 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 508 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 509 { "UseCGroupMemoryLimitForHeap", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::jdk(11) }, 510 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 511 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 512 513 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 514 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 515 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 516 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 517 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 518 519 // -------------- Obsolete Flags - sorted by expired_in -------------- 520 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 521 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 522 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 523 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 524 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 525 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 526 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 527 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 528 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 529 530 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 531 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 532 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 533 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 534 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 535 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 536 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 537 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 538 #endif 539 540 { NULL, JDK_Version(0), JDK_Version(0) } 541 }; 542 543 // Flags that are aliases for other flags. 544 typedef struct { 545 const char* alias_name; 546 const char* real_name; 547 } AliasedFlag; 548 549 static AliasedFlag const aliased_jvm_flags[] = { 550 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 551 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 552 { NULL, NULL} 553 }; 554 555 // NOTE: A compatibility request will be necessary for each alias to be removed. 556 static AliasedLoggingFlag const aliased_logging_flags[] = { 557 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 558 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 559 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 560 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 561 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 562 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 563 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 564 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 565 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 566 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 567 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 568 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 569 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 570 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 571 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 572 }; 573 574 #ifndef PRODUCT 575 // These options are removed in jdk9. Remove this code for jdk10. 576 static AliasedFlag const removed_develop_logging_flags[] = { 577 { "TraceClassInitialization", "-Xlog:class+init" }, 578 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 579 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 580 { "TraceItables", "-Xlog:itables=debug" }, 581 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 582 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 583 { "TraceStartupTime", "-Xlog:startuptime" }, 584 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 585 { "PrintVtables", "-Xlog:vtables=debug" }, 586 { "VerboseVerification", "-Xlog:verification" }, 587 { NULL, NULL } 588 }; 589 #endif //PRODUCT 590 591 // Return true if "v" is less than "other", where "other" may be "undefined". 592 static bool version_less_than(JDK_Version v, JDK_Version other) { 593 assert(!v.is_undefined(), "must be defined"); 594 if (!other.is_undefined() && v.compare(other) >= 0) { 595 return false; 596 } else { 597 return true; 598 } 599 } 600 601 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 602 603 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 604 // Allow extensions to have priority 605 if (lookup_special_flag_ext(flag_name, flag)) { 606 return true; 607 } 608 609 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 610 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 611 flag = special_jvm_flags[i]; 612 return true; 613 } 614 } 615 return false; 616 } 617 618 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 619 assert(version != NULL, "Must provide a version buffer"); 620 SpecialFlag flag; 621 if (lookup_special_flag(flag_name, flag)) { 622 if (!flag.obsolete_in.is_undefined()) { 623 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 624 *version = flag.obsolete_in; 625 return true; 626 } 627 } 628 } 629 return false; 630 } 631 632 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 633 assert(version != NULL, "Must provide a version buffer"); 634 SpecialFlag flag; 635 if (lookup_special_flag(flag_name, flag)) { 636 if (!flag.deprecated_in.is_undefined()) { 637 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 638 version_less_than(JDK_Version::current(), flag.expired_in)) { 639 *version = flag.deprecated_in; 640 return 1; 641 } else { 642 return -1; 643 } 644 } 645 } 646 return 0; 647 } 648 649 #ifndef PRODUCT 650 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 651 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 652 const AliasedFlag& flag = removed_develop_logging_flags[i]; 653 if (strcmp(flag.alias_name, name) == 0) { 654 return flag.real_name; 655 } 656 } 657 return NULL; 658 } 659 #endif // PRODUCT 660 661 const char* Arguments::real_flag_name(const char *flag_name) { 662 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 663 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 664 if (strcmp(flag_status.alias_name, flag_name) == 0) { 665 return flag_status.real_name; 666 } 667 } 668 return flag_name; 669 } 670 671 #ifdef ASSERT 672 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 673 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 674 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 675 return true; 676 } 677 } 678 return false; 679 } 680 681 static bool verify_special_jvm_flags() { 682 bool success = true; 683 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 684 const SpecialFlag& flag = special_jvm_flags[i]; 685 if (lookup_special_flag(flag.name, i)) { 686 warning("Duplicate special flag declaration \"%s\"", flag.name); 687 success = false; 688 } 689 if (flag.deprecated_in.is_undefined() && 690 flag.obsolete_in.is_undefined()) { 691 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 692 success = false; 693 } 694 695 if (!flag.deprecated_in.is_undefined()) { 696 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 697 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 698 success = false; 699 } 700 701 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 702 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 703 success = false; 704 } 705 } 706 707 if (!flag.obsolete_in.is_undefined()) { 708 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 709 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 710 success = false; 711 } 712 713 // if flag has become obsolete it should not have a "globals" flag defined anymore. 714 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 715 if (Flag::find_flag(flag.name) != NULL) { 716 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 717 success = false; 718 } 719 } 720 } 721 722 if (!flag.expired_in.is_undefined()) { 723 // if flag has become expired it should not have a "globals" flag defined anymore. 724 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 725 if (Flag::find_flag(flag.name) != NULL) { 726 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 727 success = false; 728 } 729 } 730 } 731 732 } 733 return success; 734 } 735 #endif 736 737 // Parses a size specification string. 738 bool Arguments::atojulong(const char *s, julong* result) { 739 julong n = 0; 740 741 // First char must be a digit. Don't allow negative numbers or leading spaces. 742 if (!isdigit(*s)) { 743 return false; 744 } 745 746 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 747 char* remainder; 748 errno = 0; 749 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 750 if (errno != 0) { 751 return false; 752 } 753 754 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 755 if (remainder == s || strlen(remainder) > 1) { 756 return false; 757 } 758 759 switch (*remainder) { 760 case 'T': case 't': 761 *result = n * G * K; 762 // Check for overflow. 763 if (*result/((julong)G * K) != n) return false; 764 return true; 765 case 'G': case 'g': 766 *result = n * G; 767 if (*result/G != n) return false; 768 return true; 769 case 'M': case 'm': 770 *result = n * M; 771 if (*result/M != n) return false; 772 return true; 773 case 'K': case 'k': 774 *result = n * K; 775 if (*result/K != n) return false; 776 return true; 777 case '\0': 778 *result = n; 779 return true; 780 default: 781 return false; 782 } 783 } 784 785 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 786 if (size < min_size) return arg_too_small; 787 if (size > max_size) return arg_too_big; 788 return arg_in_range; 789 } 790 791 // Describe an argument out of range error 792 void Arguments::describe_range_error(ArgsRange errcode) { 793 switch(errcode) { 794 case arg_too_big: 795 jio_fprintf(defaultStream::error_stream(), 796 "The specified size exceeds the maximum " 797 "representable size.\n"); 798 break; 799 case arg_too_small: 800 case arg_unreadable: 801 case arg_in_range: 802 // do nothing for now 803 break; 804 default: 805 ShouldNotReachHere(); 806 } 807 } 808 809 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 810 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 811 return true; 812 } else { 813 return false; 814 } 815 } 816 817 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 818 char* end; 819 errno = 0; 820 double v = strtod(value, &end); 821 if ((errno != 0) || (*end != 0)) { 822 return false; 823 } 824 825 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 826 return true; 827 } 828 return false; 829 } 830 831 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 832 julong v; 833 int int_v; 834 intx intx_v; 835 bool is_neg = false; 836 Flag* result = Flag::find_flag(name, strlen(name)); 837 838 if (result == NULL) { 839 return false; 840 } 841 842 // Check the sign first since atojulong() parses only unsigned values. 843 if (*value == '-') { 844 if (!result->is_intx() && !result->is_int()) { 845 return false; 846 } 847 value++; 848 is_neg = true; 849 } 850 if (!Arguments::atojulong(value, &v)) { 851 return false; 852 } 853 if (result->is_int()) { 854 int_v = (int) v; 855 if (is_neg) { 856 int_v = -int_v; 857 } 858 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 859 } else if (result->is_uint()) { 860 uint uint_v = (uint) v; 861 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 862 } else if (result->is_intx()) { 863 intx_v = (intx) v; 864 if (is_neg) { 865 intx_v = -intx_v; 866 } 867 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 868 } else if (result->is_uintx()) { 869 uintx uintx_v = (uintx) v; 870 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 871 } else if (result->is_uint64_t()) { 872 uint64_t uint64_t_v = (uint64_t) v; 873 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 874 } else if (result->is_size_t()) { 875 size_t size_t_v = (size_t) v; 876 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 877 } else if (result->is_double()) { 878 double double_v = (double) v; 879 return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS; 880 } else { 881 return false; 882 } 883 } 884 885 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 886 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 887 // Contract: CommandLineFlags always returns a pointer that needs freeing. 888 FREE_C_HEAP_ARRAY(char, value); 889 return true; 890 } 891 892 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 893 const char* old_value = ""; 894 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 895 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 896 size_t new_len = strlen(new_value); 897 const char* value; 898 char* free_this_too = NULL; 899 if (old_len == 0) { 900 value = new_value; 901 } else if (new_len == 0) { 902 value = old_value; 903 } else { 904 size_t length = old_len + 1 + new_len + 1; 905 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 906 // each new setting adds another LINE to the switch: 907 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 908 value = buf; 909 free_this_too = buf; 910 } 911 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 912 // CommandLineFlags always returns a pointer that needs freeing. 913 FREE_C_HEAP_ARRAY(char, value); 914 if (free_this_too != NULL) { 915 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 916 FREE_C_HEAP_ARRAY(char, free_this_too); 917 } 918 return true; 919 } 920 921 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 922 const char* real_name = real_flag_name(arg); 923 JDK_Version since = JDK_Version(); 924 switch (is_deprecated_flag(arg, &since)) { 925 case -1: 926 return NULL; // obsolete or expired, don't process normally 927 case 0: 928 return real_name; 929 case 1: { 930 if (warn) { 931 char version[256]; 932 since.to_string(version, sizeof(version)); 933 if (real_name != arg) { 934 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 935 arg, version, real_name); 936 } else { 937 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 938 arg, version); 939 } 940 } 941 return real_name; 942 } 943 } 944 ShouldNotReachHere(); 945 return NULL; 946 } 947 948 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 949 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 950 // Set tagset string buffer at max size of 256, large enough for any alias tagset 951 const int max_tagset_size = 256; 952 int max_tagset_len = max_tagset_size - 1; 953 char tagset_buffer[max_tagset_size]; 954 tagset_buffer[0] = '\0'; 955 956 // Write tag-set for aliased logging option, in string list form 957 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 958 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 959 if (i > 0) { 960 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 961 } 962 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 963 } 964 if (!alf.exactMatch) { 965 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 966 } 967 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 968 (on) ? "+" : "-", 969 name, 970 tagset_buffer, 971 (on) ? LogLevel::name(alf.level) : "off"); 972 } 973 974 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 975 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 976 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 977 if (strcmp(alf.alias_name, name) == 0) { 978 log_deprecated_flag(name, on, alf); 979 return alf; 980 } 981 } 982 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 983 return a; 984 } 985 986 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 987 988 // range of acceptable characters spelled out for portability reasons 989 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 990 #define BUFLEN 255 991 char name[BUFLEN+1]; 992 char dummy; 993 const char* real_name; 994 bool warn_if_deprecated = true; 995 996 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 997 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 998 if (alf.alias_name != NULL){ 999 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1000 return true; 1001 } 1002 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1003 if (real_name == NULL) { 1004 return false; 1005 } 1006 return set_bool_flag(real_name, false, origin); 1007 } 1008 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1009 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1010 if (alf.alias_name != NULL){ 1011 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1012 return true; 1013 } 1014 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1015 if (real_name == NULL) { 1016 return false; 1017 } 1018 return set_bool_flag(real_name, true, origin); 1019 } 1020 1021 char punct; 1022 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1023 const char* value = strchr(arg, '=') + 1; 1024 Flag* flag; 1025 1026 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1027 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1028 if (alf.alias_name != NULL) { 1029 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1030 return true; 1031 } 1032 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1033 if (real_name == NULL) { 1034 return false; 1035 } 1036 flag = Flag::find_flag(real_name); 1037 if (flag != NULL && flag->is_ccstr()) { 1038 if (flag->ccstr_accumulates()) { 1039 return append_to_string_flag(real_name, value, origin); 1040 } else { 1041 if (value[0] == '\0') { 1042 value = NULL; 1043 } 1044 return set_string_flag(real_name, value, origin); 1045 } 1046 } else { 1047 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1048 } 1049 } 1050 1051 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1052 const char* value = strchr(arg, '=') + 1; 1053 // -XX:Foo:=xxx will reset the string flag to the given value. 1054 if (value[0] == '\0') { 1055 value = NULL; 1056 } 1057 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1058 if (real_name == NULL) { 1059 return false; 1060 } 1061 return set_string_flag(real_name, value, origin); 1062 } 1063 1064 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1065 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1066 #define NUMBER_RANGE "[0123456789eE+-]" 1067 char value[BUFLEN + 1]; 1068 char value2[BUFLEN + 1]; 1069 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1070 // Looks like a floating-point number -- try again with more lenient format string 1071 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1072 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1073 if (real_name == NULL) { 1074 return false; 1075 } 1076 return set_fp_numeric_flag(real_name, value, origin); 1077 } 1078 } 1079 1080 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1081 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1082 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1083 if (real_name == NULL) { 1084 return false; 1085 } 1086 return set_numeric_flag(real_name, value, origin); 1087 } 1088 1089 return false; 1090 } 1091 1092 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1093 assert(bldarray != NULL, "illegal argument"); 1094 1095 if (arg == NULL) { 1096 return; 1097 } 1098 1099 int new_count = *count + 1; 1100 1101 // expand the array and add arg to the last element 1102 if (*bldarray == NULL) { 1103 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1104 } else { 1105 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1106 } 1107 (*bldarray)[*count] = os::strdup_check_oom(arg); 1108 *count = new_count; 1109 } 1110 1111 void Arguments::build_jvm_args(const char* arg) { 1112 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1113 } 1114 1115 void Arguments::build_jvm_flags(const char* arg) { 1116 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1117 } 1118 1119 // utility function to return a string that concatenates all 1120 // strings in a given char** array 1121 const char* Arguments::build_resource_string(char** args, int count) { 1122 if (args == NULL || count == 0) { 1123 return NULL; 1124 } 1125 size_t length = 0; 1126 for (int i = 0; i < count; i++) { 1127 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1128 } 1129 char* s = NEW_RESOURCE_ARRAY(char, length); 1130 char* dst = s; 1131 for (int j = 0; j < count; j++) { 1132 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1133 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1134 dst += offset; 1135 length -= offset; 1136 } 1137 return (const char*) s; 1138 } 1139 1140 void Arguments::print_on(outputStream* st) { 1141 st->print_cr("VM Arguments:"); 1142 if (num_jvm_flags() > 0) { 1143 st->print("jvm_flags: "); print_jvm_flags_on(st); 1144 st->cr(); 1145 } 1146 if (num_jvm_args() > 0) { 1147 st->print("jvm_args: "); print_jvm_args_on(st); 1148 st->cr(); 1149 } 1150 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1151 if (_java_class_path != NULL) { 1152 char* path = _java_class_path->value(); 1153 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1154 } 1155 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1156 } 1157 1158 void Arguments::print_summary_on(outputStream* st) { 1159 // Print the command line. Environment variables that are helpful for 1160 // reproducing the problem are written later in the hs_err file. 1161 // flags are from setting file 1162 if (num_jvm_flags() > 0) { 1163 st->print_raw("Settings File: "); 1164 print_jvm_flags_on(st); 1165 st->cr(); 1166 } 1167 // args are the command line and environment variable arguments. 1168 st->print_raw("Command Line: "); 1169 if (num_jvm_args() > 0) { 1170 print_jvm_args_on(st); 1171 } 1172 // this is the classfile and any arguments to the java program 1173 if (java_command() != NULL) { 1174 st->print("%s", java_command()); 1175 } 1176 st->cr(); 1177 } 1178 1179 void Arguments::print_jvm_flags_on(outputStream* st) { 1180 if (_num_jvm_flags > 0) { 1181 for (int i=0; i < _num_jvm_flags; i++) { 1182 st->print("%s ", _jvm_flags_array[i]); 1183 } 1184 } 1185 } 1186 1187 void Arguments::print_jvm_args_on(outputStream* st) { 1188 if (_num_jvm_args > 0) { 1189 for (int i=0; i < _num_jvm_args; i++) { 1190 st->print("%s ", _jvm_args_array[i]); 1191 } 1192 } 1193 } 1194 1195 bool Arguments::process_argument(const char* arg, 1196 jboolean ignore_unrecognized, 1197 Flag::Flags origin) { 1198 JDK_Version since = JDK_Version(); 1199 1200 if (parse_argument(arg, origin)) { 1201 return true; 1202 } 1203 1204 // Determine if the flag has '+', '-', or '=' characters. 1205 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1206 const char* const argname = has_plus_minus ? arg + 1 : arg; 1207 1208 size_t arg_len; 1209 const char* equal_sign = strchr(argname, '='); 1210 if (equal_sign == NULL) { 1211 arg_len = strlen(argname); 1212 } else { 1213 arg_len = equal_sign - argname; 1214 } 1215 1216 // Only make the obsolete check for valid arguments. 1217 if (arg_len <= BUFLEN) { 1218 // Construct a string which consists only of the argument name without '+', '-', or '='. 1219 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1220 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1221 if (is_obsolete_flag(stripped_argname, &since)) { 1222 char version[256]; 1223 since.to_string(version, sizeof(version)); 1224 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1225 return true; 1226 } 1227 #ifndef PRODUCT 1228 else { 1229 const char* replacement; 1230 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1231 log_warning(arguments)("%s has been removed. Please use %s instead.", 1232 stripped_argname, 1233 replacement); 1234 return false; 1235 } 1236 } 1237 #endif //PRODUCT 1238 } 1239 1240 // For locked flags, report a custom error message if available. 1241 // Otherwise, report the standard unrecognized VM option. 1242 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1243 if (found_flag != NULL) { 1244 char locked_message_buf[BUFLEN]; 1245 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1246 if (strlen(locked_message_buf) == 0) { 1247 if (found_flag->is_bool() && !has_plus_minus) { 1248 jio_fprintf(defaultStream::error_stream(), 1249 "Missing +/- setting for VM option '%s'\n", argname); 1250 } else if (!found_flag->is_bool() && has_plus_minus) { 1251 jio_fprintf(defaultStream::error_stream(), 1252 "Unexpected +/- setting in VM option '%s'\n", argname); 1253 } else { 1254 jio_fprintf(defaultStream::error_stream(), 1255 "Improperly specified VM option '%s'\n", argname); 1256 } 1257 } else { 1258 #ifdef PRODUCT 1259 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1260 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1261 if (ignore_unrecognized && mismatched) { 1262 return true; 1263 } 1264 #endif 1265 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1266 } 1267 } else { 1268 if (ignore_unrecognized) { 1269 return true; 1270 } 1271 jio_fprintf(defaultStream::error_stream(), 1272 "Unrecognized VM option '%s'\n", argname); 1273 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1274 if (fuzzy_matched != NULL) { 1275 jio_fprintf(defaultStream::error_stream(), 1276 "Did you mean '%s%s%s'? ", 1277 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1278 fuzzy_matched->_name, 1279 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1280 } 1281 } 1282 1283 // allow for commandline "commenting out" options like -XX:#+Verbose 1284 return arg[0] == '#'; 1285 } 1286 1287 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1288 FILE* stream = fopen(file_name, "rb"); 1289 if (stream == NULL) { 1290 if (should_exist) { 1291 jio_fprintf(defaultStream::error_stream(), 1292 "Could not open settings file %s\n", file_name); 1293 return false; 1294 } else { 1295 return true; 1296 } 1297 } 1298 1299 char token[1024]; 1300 int pos = 0; 1301 1302 bool in_white_space = true; 1303 bool in_comment = false; 1304 bool in_quote = false; 1305 char quote_c = 0; 1306 bool result = true; 1307 1308 int c = getc(stream); 1309 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1310 if (in_white_space) { 1311 if (in_comment) { 1312 if (c == '\n') in_comment = false; 1313 } else { 1314 if (c == '#') in_comment = true; 1315 else if (!isspace(c)) { 1316 in_white_space = false; 1317 token[pos++] = c; 1318 } 1319 } 1320 } else { 1321 if (c == '\n' || (!in_quote && isspace(c))) { 1322 // token ends at newline, or at unquoted whitespace 1323 // this allows a way to include spaces in string-valued options 1324 token[pos] = '\0'; 1325 logOption(token); 1326 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1327 build_jvm_flags(token); 1328 pos = 0; 1329 in_white_space = true; 1330 in_quote = false; 1331 } else if (!in_quote && (c == '\'' || c == '"')) { 1332 in_quote = true; 1333 quote_c = c; 1334 } else if (in_quote && (c == quote_c)) { 1335 in_quote = false; 1336 } else { 1337 token[pos++] = c; 1338 } 1339 } 1340 c = getc(stream); 1341 } 1342 if (pos > 0) { 1343 token[pos] = '\0'; 1344 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1345 build_jvm_flags(token); 1346 } 1347 fclose(stream); 1348 return result; 1349 } 1350 1351 //============================================================================================================= 1352 // Parsing of properties (-D) 1353 1354 const char* Arguments::get_property(const char* key) { 1355 return PropertyList_get_value(system_properties(), key); 1356 } 1357 1358 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1359 const char* eq = strchr(prop, '='); 1360 const char* key; 1361 const char* value = ""; 1362 1363 if (eq == NULL) { 1364 // property doesn't have a value, thus use passed string 1365 key = prop; 1366 } else { 1367 // property have a value, thus extract it and save to the 1368 // allocated string 1369 size_t key_len = eq - prop; 1370 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1371 1372 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1373 key = tmp_key; 1374 1375 value = &prop[key_len + 1]; 1376 } 1377 1378 if (strcmp(key, "java.compiler") == 0) { 1379 process_java_compiler_argument(value); 1380 // Record value in Arguments, but let it get passed to Java. 1381 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1382 strcmp(key, "sun.java.launcher.pid") == 0) { 1383 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1384 // private and are processed in process_sun_java_launcher_properties(); 1385 // the sun.java.launcher property is passed on to the java application 1386 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1387 // append is true, writable is true, internal is false 1388 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1389 WriteableProperty, ExternalProperty); 1390 } else { 1391 if (strcmp(key, "sun.java.command") == 0) { 1392 char *old_java_command = _java_command; 1393 _java_command = os::strdup_check_oom(value, mtArguments); 1394 if (old_java_command != NULL) { 1395 os::free(old_java_command); 1396 } 1397 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1398 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1399 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1400 // its value without going through the property list or making a Java call. 1401 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1402 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1403 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1404 os::free((void *)old_java_vendor_url_bug); 1405 } 1406 } 1407 1408 // Create new property and add at the end of the list 1409 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1410 } 1411 1412 if (key != prop) { 1413 // SystemProperty copy passed value, thus free previously allocated 1414 // memory 1415 FreeHeap((void *)key); 1416 } 1417 1418 return true; 1419 } 1420 1421 #if INCLUDE_CDS 1422 void Arguments::check_unsupported_dumping_properties() { 1423 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1424 const char* unsupported_properties[] = { "jdk.module.main", 1425 "jdk.module.limitmods", 1426 "jdk.module.path", 1427 "jdk.module.upgrade.path", 1428 "jdk.module.patch.0" }; 1429 const char* unsupported_options[] = { "-m", // cannot use at dump time 1430 "--limit-modules", // ignored at dump time 1431 "--module-path", // ignored at dump time 1432 "--upgrade-module-path", // ignored at dump time 1433 "--patch-module" // ignored at dump time 1434 }; 1435 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1436 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1437 // vm will exit with an error message. Otherwise, it will print an informational message if 1438 // -Xlog:cds is enabled. 1439 uint info_idx = 1; 1440 SystemProperty* sp = system_properties(); 1441 while (sp != NULL) { 1442 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1443 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1444 if (i < info_idx) { 1445 vm_exit_during_initialization( 1446 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1447 } else { 1448 log_info(cds)("Info: the %s option is ignored when dumping the shared archive", 1449 unsupported_options[i]); 1450 } 1451 } 1452 } 1453 sp = sp->next(); 1454 } 1455 1456 // Check for an exploded module build in use with -Xshare:dump. 1457 if (!has_jimage()) { 1458 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1459 } 1460 } 1461 #endif 1462 1463 //=========================================================================================================== 1464 // Setting int/mixed/comp mode flags 1465 1466 void Arguments::set_mode_flags(Mode mode) { 1467 // Set up default values for all flags. 1468 // If you add a flag to any of the branches below, 1469 // add a default value for it here. 1470 set_java_compiler(false); 1471 _mode = mode; 1472 1473 // Ensure Agent_OnLoad has the correct initial values. 1474 // This may not be the final mode; mode may change later in onload phase. 1475 PropertyList_unique_add(&_system_properties, "java.vm.info", 1476 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1477 1478 UseInterpreter = true; 1479 UseCompiler = true; 1480 UseLoopCounter = true; 1481 1482 // Default values may be platform/compiler dependent - 1483 // use the saved values 1484 ClipInlining = Arguments::_ClipInlining; 1485 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1486 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1487 BackgroundCompilation = Arguments::_BackgroundCompilation; 1488 if (TieredCompilation) { 1489 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1490 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1491 } 1492 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1493 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1494 } 1495 } 1496 1497 // Change from defaults based on mode 1498 switch (mode) { 1499 default: 1500 ShouldNotReachHere(); 1501 break; 1502 case _int: 1503 UseCompiler = false; 1504 UseLoopCounter = false; 1505 AlwaysCompileLoopMethods = false; 1506 UseOnStackReplacement = false; 1507 break; 1508 case _mixed: 1509 // same as default 1510 break; 1511 case _comp: 1512 UseInterpreter = false; 1513 BackgroundCompilation = false; 1514 ClipInlining = false; 1515 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1516 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1517 // compile a level 4 (C2) and then continue executing it. 1518 if (TieredCompilation) { 1519 Tier3InvokeNotifyFreqLog = 0; 1520 Tier4InvocationThreshold = 0; 1521 } 1522 break; 1523 } 1524 } 1525 1526 // Conflict: required to use shared spaces (-Xshare:on), but 1527 // incompatible command line options were chosen. 1528 static void no_shared_spaces(const char* message) { 1529 if (RequireSharedSpaces) { 1530 jio_fprintf(defaultStream::error_stream(), 1531 "Class data sharing is inconsistent with other specified options.\n"); 1532 vm_exit_during_initialization("Unable to use shared archive.", message); 1533 } else { 1534 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1535 } 1536 } 1537 1538 // Returns threshold scaled with the value of scale. 1539 // If scale < 0.0, threshold is returned without scaling. 1540 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1541 if (scale == 1.0 || scale < 0.0) { 1542 return threshold; 1543 } else { 1544 return (intx)(threshold * scale); 1545 } 1546 } 1547 1548 // Returns freq_log scaled with the value of scale. 1549 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1550 // If scale < 0.0, freq_log is returned without scaling. 1551 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1552 // Check if scaling is necessary or if negative value was specified. 1553 if (scale == 1.0 || scale < 0.0) { 1554 return freq_log; 1555 } 1556 // Check values to avoid calculating log2 of 0. 1557 if (scale == 0.0 || freq_log == 0) { 1558 return 0; 1559 } 1560 // Determine the maximum notification frequency value currently supported. 1561 // The largest mask value that the interpreter/C1 can handle is 1562 // of length InvocationCounter::number_of_count_bits. Mask values are always 1563 // one bit shorter then the value of the notification frequency. Set 1564 // max_freq_bits accordingly. 1565 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1566 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1567 if (scaled_freq == 0) { 1568 // Return 0 right away to avoid calculating log2 of 0. 1569 return 0; 1570 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1571 return max_freq_bits; 1572 } else { 1573 return log2_intptr(scaled_freq); 1574 } 1575 } 1576 1577 void Arguments::set_tiered_flags() { 1578 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1579 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1580 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1581 } 1582 if (CompilationPolicyChoice < 2) { 1583 vm_exit_during_initialization( 1584 "Incompatible compilation policy selected", NULL); 1585 } 1586 // Increase the code cache size - tiered compiles a lot more. 1587 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1588 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1589 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1590 } 1591 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1592 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1593 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1594 } 1595 if (!UseInterpreter) { // -Xcomp 1596 Tier3InvokeNotifyFreqLog = 0; 1597 Tier4InvocationThreshold = 0; 1598 } 1599 1600 if (CompileThresholdScaling < 0) { 1601 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1602 } 1603 1604 // Scale tiered compilation thresholds. 1605 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1606 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1607 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1608 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1609 1610 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1611 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1612 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1613 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1614 1615 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1616 // once these thresholds become supported. 1617 1618 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1619 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1620 1621 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1622 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1623 1624 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1625 1626 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1627 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1628 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1629 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1630 } 1631 } 1632 1633 void set_object_alignment() { 1634 // Object alignment. 1635 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1636 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1637 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1638 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1639 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1640 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1641 1642 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1643 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1644 1645 // Oop encoding heap max 1646 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1647 1648 if (SurvivorAlignmentInBytes == 0) { 1649 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1650 } 1651 } 1652 1653 size_t Arguments::max_heap_for_compressed_oops() { 1654 // Avoid sign flip. 1655 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1656 // We need to fit both the NULL page and the heap into the memory budget, while 1657 // keeping alignment constraints of the heap. To guarantee the latter, as the 1658 // NULL page is located before the heap, we pad the NULL page to the conservative 1659 // maximum alignment that the GC may ever impose upon the heap. 1660 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1661 _conservative_max_heap_alignment); 1662 1663 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1664 NOT_LP64(ShouldNotReachHere(); return 0); 1665 } 1666 1667 void Arguments::set_use_compressed_oops() { 1668 #ifndef ZERO 1669 #ifdef _LP64 1670 // MaxHeapSize is not set up properly at this point, but 1671 // the only value that can override MaxHeapSize if we are 1672 // to use UseCompressedOops is InitialHeapSize. 1673 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1674 1675 if (max_heap_size <= max_heap_for_compressed_oops()) { 1676 #if !defined(COMPILER1) || defined(TIERED) 1677 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1678 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1679 } 1680 #endif 1681 } else { 1682 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1683 warning("Max heap size too large for Compressed Oops"); 1684 FLAG_SET_DEFAULT(UseCompressedOops, false); 1685 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1686 } 1687 } 1688 #endif // _LP64 1689 #endif // ZERO 1690 } 1691 1692 1693 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1694 // set_use_compressed_oops(). 1695 void Arguments::set_use_compressed_klass_ptrs() { 1696 #ifndef ZERO 1697 #ifdef _LP64 1698 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1699 if (!UseCompressedOops) { 1700 if (UseCompressedClassPointers) { 1701 warning("UseCompressedClassPointers requires UseCompressedOops"); 1702 } 1703 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1704 } else { 1705 // Turn on UseCompressedClassPointers too 1706 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1707 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1708 } 1709 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1710 if (UseCompressedClassPointers) { 1711 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1712 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1713 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1714 } 1715 } 1716 } 1717 #endif // _LP64 1718 #endif // !ZERO 1719 } 1720 1721 void Arguments::set_conservative_max_heap_alignment() { 1722 // The conservative maximum required alignment for the heap is the maximum of 1723 // the alignments imposed by several sources: any requirements from the heap 1724 // itself, the collector policy and the maximum page size we may run the VM 1725 // with. 1726 size_t heap_alignment = GCArguments::arguments()->conservative_max_heap_alignment(); 1727 _conservative_max_heap_alignment = MAX4(heap_alignment, 1728 (size_t)os::vm_allocation_granularity(), 1729 os::max_page_size(), 1730 CollectorPolicy::compute_heap_alignment()); 1731 } 1732 1733 #ifdef TIERED 1734 bool Arguments::compilation_mode_selected() { 1735 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1736 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1737 1738 } 1739 1740 void Arguments::select_compilation_mode_ergonomically() { 1741 #if defined(_WINDOWS) && !defined(_LP64) 1742 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1743 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1744 } 1745 #endif 1746 if (NeverActAsServerClassMachine) { 1747 set_client_compilation_mode(); 1748 } 1749 } 1750 #endif //TIERED 1751 1752 #if INCLUDE_JVMCI 1753 void Arguments::set_jvmci_specific_flags() { 1754 if (UseJVMCICompiler) { 1755 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1756 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1757 } 1758 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1759 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1760 } 1761 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1762 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1763 } 1764 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1765 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1766 } 1767 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1768 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1769 } 1770 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1771 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1772 } 1773 if (TieredStopAtLevel != CompLevel_full_optimization) { 1774 // Currently JVMCI compiler can only work at the full optimization level 1775 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1776 TieredStopAtLevel = CompLevel_full_optimization; 1777 } 1778 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1779 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1780 } 1781 } 1782 } 1783 #endif 1784 1785 jint Arguments::set_ergonomics_flags() { 1786 #ifdef TIERED 1787 if (!compilation_mode_selected()) { 1788 select_compilation_mode_ergonomically(); 1789 } 1790 #endif 1791 1792 jint gc_result = GCArguments::initialize(); 1793 if (gc_result != JNI_OK) { 1794 return gc_result; 1795 } 1796 1797 #if COMPILER2_OR_JVMCI 1798 // Shared spaces work fine with other GCs but causes bytecode rewriting 1799 // to be disabled, which hurts interpreter performance and decreases 1800 // server performance. When -server is specified, keep the default off 1801 // unless it is asked for. Future work: either add bytecode rewriting 1802 // at link time, or rewrite bytecodes in non-shared methods. 1803 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1804 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1805 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1806 } 1807 #endif 1808 1809 set_conservative_max_heap_alignment(); 1810 1811 #ifndef ZERO 1812 #ifdef _LP64 1813 set_use_compressed_oops(); 1814 1815 // set_use_compressed_klass_ptrs() must be called after calling 1816 // set_use_compressed_oops(). 1817 set_use_compressed_klass_ptrs(); 1818 1819 // Also checks that certain machines are slower with compressed oops 1820 // in vm_version initialization code. 1821 #endif // _LP64 1822 #endif // !ZERO 1823 1824 return JNI_OK; 1825 } 1826 1827 void Arguments::set_gc_specific_flags() { 1828 // Set GC flags 1829 GCArguments::arguments()->initialize_flags(); 1830 } 1831 1832 julong Arguments::limit_by_allocatable_memory(julong limit) { 1833 julong max_allocatable; 1834 julong result = limit; 1835 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1836 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1837 } 1838 return result; 1839 } 1840 1841 // Use static initialization to get the default before parsing 1842 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1843 1844 void Arguments::set_heap_size() { 1845 julong phys_mem = 1846 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1847 : (julong)MaxRAM; 1848 1849 // Experimental support for CGroup memory limits 1850 if (UseCGroupMemoryLimitForHeap) { 1851 // This is a rough indicator that a CGroup limit may be in force 1852 // for this process 1853 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 1854 FILE *fp = fopen(lim_file, "r"); 1855 if (fp != NULL) { 1856 julong cgroup_max = 0; 1857 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 1858 if (ret == 1 && cgroup_max > 0) { 1859 // If unlimited, cgroup_max will be a very large, but unspecified 1860 // value, so use initial phys_mem as a limit 1861 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 1862 JULONG_FORMAT "MB) and initial phys_mem (" 1863 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 1864 phys_mem = MIN2(cgroup_max, phys_mem); 1865 } else { 1866 warning("Unable to read/parse cgroup memory limit from %s: %s", 1867 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 1868 } 1869 fclose(fp); 1870 } else { 1871 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 1872 } 1873 } 1874 1875 // Convert deprecated flags 1876 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1877 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1878 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1879 1880 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1881 !FLAG_IS_DEFAULT(MinRAMFraction)) 1882 MinRAMPercentage = 100.0 / MinRAMFraction; 1883 1884 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1885 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1886 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1887 1888 // If the maximum heap size has not been set with -Xmx, 1889 // then set it as fraction of the size of physical memory, 1890 // respecting the maximum and minimum sizes of the heap. 1891 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1892 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1893 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1894 if (reasonable_min < MaxHeapSize) { 1895 // Small physical memory, so use a minimum fraction of it for the heap 1896 reasonable_max = reasonable_min; 1897 } else { 1898 // Not-small physical memory, so require a heap at least 1899 // as large as MaxHeapSize 1900 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1901 } 1902 1903 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1904 // Limit the heap size to ErgoHeapSizeLimit 1905 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1906 } 1907 if (UseCompressedOops) { 1908 // Limit the heap size to the maximum possible when using compressed oops 1909 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1910 1911 // HeapBaseMinAddress can be greater than default but not less than. 1912 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1913 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1914 // matches compressed oops printing flags 1915 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1916 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1917 DefaultHeapBaseMinAddress, 1918 DefaultHeapBaseMinAddress/G, 1919 HeapBaseMinAddress); 1920 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1921 } 1922 } 1923 1924 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1925 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1926 // but it should be not less than default MaxHeapSize. 1927 max_coop_heap -= HeapBaseMinAddress; 1928 } 1929 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1930 } 1931 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1932 1933 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1934 // An initial heap size was specified on the command line, 1935 // so be sure that the maximum size is consistent. Done 1936 // after call to limit_by_allocatable_memory because that 1937 // method might reduce the allocation size. 1938 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1939 } 1940 1941 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1942 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1943 } 1944 1945 // If the minimum or initial heap_size have not been set or requested to be set 1946 // ergonomically, set them accordingly. 1947 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1948 julong reasonable_minimum = (julong)(OldSize + NewSize); 1949 1950 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1951 1952 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1953 1954 if (InitialHeapSize == 0) { 1955 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1956 1957 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1958 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1959 1960 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1961 1962 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1963 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1964 } 1965 // If the minimum heap size has not been set (via -Xms), 1966 // synchronize with InitialHeapSize to avoid errors with the default value. 1967 if (min_heap_size() == 0) { 1968 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1969 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1970 } 1971 } 1972 } 1973 1974 // This option inspects the machine and attempts to set various 1975 // parameters to be optimal for long-running, memory allocation 1976 // intensive jobs. It is intended for machines with large 1977 // amounts of cpu and memory. 1978 jint Arguments::set_aggressive_heap_flags() { 1979 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1980 // VM, but we may not be able to represent the total physical memory 1981 // available (like having 8gb of memory on a box but using a 32bit VM). 1982 // Thus, we need to make sure we're using a julong for intermediate 1983 // calculations. 1984 julong initHeapSize; 1985 julong total_memory = os::physical_memory(); 1986 1987 if (total_memory < (julong) 256 * M) { 1988 jio_fprintf(defaultStream::error_stream(), 1989 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1990 vm_exit(1); 1991 } 1992 1993 // The heap size is half of available memory, or (at most) 1994 // all of possible memory less 160mb (leaving room for the OS 1995 // when using ISM). This is the maximum; because adaptive sizing 1996 // is turned on below, the actual space used may be smaller. 1997 1998 initHeapSize = MIN2(total_memory / (julong) 2, 1999 total_memory - (julong) 160 * M); 2000 2001 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2002 2003 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2004 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2005 return JNI_EINVAL; 2006 } 2007 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2008 return JNI_EINVAL; 2009 } 2010 // Currently the minimum size and the initial heap sizes are the same. 2011 set_min_heap_size(initHeapSize); 2012 } 2013 if (FLAG_IS_DEFAULT(NewSize)) { 2014 // Make the young generation 3/8ths of the total heap. 2015 if (FLAG_SET_CMDLINE(size_t, NewSize, 2016 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2017 return JNI_EINVAL; 2018 } 2019 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2020 return JNI_EINVAL; 2021 } 2022 } 2023 2024 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2025 FLAG_SET_DEFAULT(UseLargePages, true); 2026 #endif 2027 2028 // Increase some data structure sizes for efficiency 2029 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2030 return JNI_EINVAL; 2031 } 2032 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2033 return JNI_EINVAL; 2034 } 2035 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2036 return JNI_EINVAL; 2037 } 2038 2039 // See the OldPLABSize comment below, but replace 'after promotion' 2040 // with 'after copying'. YoungPLABSize is the size of the survivor 2041 // space per-gc-thread buffers. The default is 4kw. 2042 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2043 return JNI_EINVAL; 2044 } 2045 2046 // OldPLABSize is the size of the buffers in the old gen that 2047 // UseParallelGC uses to promote live data that doesn't fit in the 2048 // survivor spaces. At any given time, there's one for each gc thread. 2049 // The default size is 1kw. These buffers are rarely used, since the 2050 // survivor spaces are usually big enough. For specjbb, however, there 2051 // are occasions when there's lots of live data in the young gen 2052 // and we end up promoting some of it. We don't have a definite 2053 // explanation for why bumping OldPLABSize helps, but the theory 2054 // is that a bigger PLAB results in retaining something like the 2055 // original allocation order after promotion, which improves mutator 2056 // locality. A minor effect may be that larger PLABs reduce the 2057 // number of PLAB allocation events during gc. The value of 8kw 2058 // was arrived at by experimenting with specjbb. 2059 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2060 return JNI_EINVAL; 2061 } 2062 2063 // Enable parallel GC and adaptive generation sizing 2064 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2065 return JNI_EINVAL; 2066 } 2067 2068 // Encourage steady state memory management 2069 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2070 return JNI_EINVAL; 2071 } 2072 2073 // This appears to improve mutator locality 2074 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2075 return JNI_EINVAL; 2076 } 2077 2078 // Get around early Solaris scheduling bug 2079 // (affinity vs other jobs on system) 2080 // but disallow DR and offlining (5008695). 2081 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2082 return JNI_EINVAL; 2083 } 2084 2085 return JNI_OK; 2086 } 2087 2088 // This must be called after ergonomics. 2089 void Arguments::set_bytecode_flags() { 2090 if (!RewriteBytecodes) { 2091 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2092 } 2093 } 2094 2095 // Aggressive optimization flags -XX:+AggressiveOpts 2096 jint Arguments::set_aggressive_opts_flags() { 2097 #ifdef COMPILER2 2098 if (AggressiveUnboxing) { 2099 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2100 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2101 } else if (!EliminateAutoBox) { 2102 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2103 AggressiveUnboxing = false; 2104 } 2105 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2106 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2107 } else if (!DoEscapeAnalysis) { 2108 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2109 AggressiveUnboxing = false; 2110 } 2111 } 2112 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2113 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2114 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2115 } 2116 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2117 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2118 } 2119 2120 // Feed the cache size setting into the JDK 2121 char buffer[1024]; 2122 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2123 if (!add_property(buffer)) { 2124 return JNI_ENOMEM; 2125 } 2126 } 2127 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2128 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2129 } 2130 #endif 2131 2132 if (AggressiveOpts) { 2133 // Sample flag setting code 2134 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2135 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2136 // } 2137 } 2138 2139 return JNI_OK; 2140 } 2141 2142 //=========================================================================================================== 2143 // Parsing of java.compiler property 2144 2145 void Arguments::process_java_compiler_argument(const char* arg) { 2146 // For backwards compatibility, Djava.compiler=NONE or "" 2147 // causes us to switch to -Xint mode UNLESS -Xdebug 2148 // is also specified. 2149 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2150 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2151 } 2152 } 2153 2154 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2155 _sun_java_launcher = os::strdup_check_oom(launcher); 2156 } 2157 2158 bool Arguments::created_by_java_launcher() { 2159 assert(_sun_java_launcher != NULL, "property must have value"); 2160 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2161 } 2162 2163 bool Arguments::sun_java_launcher_is_altjvm() { 2164 return _sun_java_launcher_is_altjvm; 2165 } 2166 2167 //=========================================================================================================== 2168 // Parsing of main arguments 2169 2170 #if INCLUDE_JVMCI 2171 // Check consistency of jvmci vm argument settings. 2172 bool Arguments::check_jvmci_args_consistency() { 2173 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2174 } 2175 #endif //INCLUDE_JVMCI 2176 2177 // Check consistency of GC selection 2178 bool Arguments::check_gc_consistency() { 2179 // Ensure that the user has not selected conflicting sets 2180 // of collectors. 2181 uint i = 0; 2182 if (UseSerialGC) i++; 2183 if (UseConcMarkSweepGC) i++; 2184 if (UseParallelGC || UseParallelOldGC) i++; 2185 if (UseG1GC) i++; 2186 if (i > 1) { 2187 jio_fprintf(defaultStream::error_stream(), 2188 "Conflicting collector combinations in option list; " 2189 "please refer to the release notes for the combinations " 2190 "allowed\n"); 2191 return false; 2192 } 2193 2194 return true; 2195 } 2196 2197 // Check the consistency of vm_init_args 2198 bool Arguments::check_vm_args_consistency() { 2199 // Method for adding checks for flag consistency. 2200 // The intent is to warn the user of all possible conflicts, 2201 // before returning an error. 2202 // Note: Needs platform-dependent factoring. 2203 bool status = true; 2204 2205 if (TLABRefillWasteFraction == 0) { 2206 jio_fprintf(defaultStream::error_stream(), 2207 "TLABRefillWasteFraction should be a denominator, " 2208 "not " SIZE_FORMAT "\n", 2209 TLABRefillWasteFraction); 2210 status = false; 2211 } 2212 2213 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2214 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2215 } 2216 2217 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2218 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2219 } 2220 2221 if (GCTimeLimit == 100) { 2222 // Turn off gc-overhead-limit-exceeded checks 2223 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2224 } 2225 2226 status = status && check_gc_consistency(); 2227 2228 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2229 // insists that we hold the requisite locks so that the iteration is 2230 // MT-safe. For the verification at start-up and shut-down, we don't 2231 // yet have a good way of acquiring and releasing these locks, 2232 // which are not visible at the CollectedHeap level. We want to 2233 // be able to acquire these locks and then do the iteration rather 2234 // than just disable the lock verification. This will be fixed under 2235 // bug 4788986. 2236 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2237 if (VerifyDuringStartup) { 2238 warning("Heap verification at start-up disabled " 2239 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2240 VerifyDuringStartup = false; // Disable verification at start-up 2241 } 2242 2243 if (VerifyBeforeExit) { 2244 warning("Heap verification at shutdown disabled " 2245 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2246 VerifyBeforeExit = false; // Disable verification at shutdown 2247 } 2248 } 2249 2250 if (PrintNMTStatistics) { 2251 #if INCLUDE_NMT 2252 if (MemTracker::tracking_level() == NMT_off) { 2253 #endif // INCLUDE_NMT 2254 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2255 PrintNMTStatistics = false; 2256 #if INCLUDE_NMT 2257 } 2258 #endif 2259 } 2260 2261 #if INCLUDE_JVMCI 2262 status = status && check_jvmci_args_consistency(); 2263 2264 if (EnableJVMCI) { 2265 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2266 AddProperty, UnwriteableProperty, InternalProperty); 2267 2268 if (!ScavengeRootsInCode) { 2269 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2270 ScavengeRootsInCode = 1; 2271 } 2272 } 2273 #endif 2274 2275 // Check lower bounds of the code cache 2276 // Template Interpreter code is approximately 3X larger in debug builds. 2277 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2278 if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2279 jio_fprintf(defaultStream::error_stream(), 2280 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2281 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2282 status = false; 2283 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2284 jio_fprintf(defaultStream::error_stream(), 2285 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2286 min_code_cache_size/K); 2287 status = false; 2288 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2289 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2290 jio_fprintf(defaultStream::error_stream(), 2291 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2292 CODE_CACHE_SIZE_LIMIT/M); 2293 status = false; 2294 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2295 jio_fprintf(defaultStream::error_stream(), 2296 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2297 min_code_cache_size/K); 2298 status = false; 2299 } 2300 2301 #ifdef _LP64 2302 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2303 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2304 } 2305 #endif 2306 2307 #ifndef SUPPORT_RESERVED_STACK_AREA 2308 if (StackReservedPages != 0) { 2309 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2310 warning("Reserved Stack Area not supported on this platform"); 2311 } 2312 #endif 2313 2314 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2315 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2316 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2317 } 2318 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2319 } 2320 if (UseCompiler && is_interpreter_only()) { 2321 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2322 warning("UseCompiler disabled due to -Xint."); 2323 } 2324 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2325 } 2326 #ifdef COMPILER2 2327 if (PostLoopMultiversioning && !RangeCheckElimination) { 2328 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2329 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2330 } 2331 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2332 } 2333 if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) { 2334 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) { 2335 warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1"); 2336 } 2337 LoopStripMiningIter = 1; 2338 } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) { 2339 if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) { 2340 warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0"); 2341 } 2342 LoopStripMiningIter = 0; 2343 } 2344 if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) { 2345 // blind guess 2346 LoopStripMiningIterShortLoop = LoopStripMiningIter / 10; 2347 } 2348 #endif 2349 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2350 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2351 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2352 } 2353 } 2354 return status; 2355 } 2356 2357 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2358 const char* option_type) { 2359 if (ignore) return false; 2360 2361 const char* spacer = " "; 2362 if (option_type == NULL) { 2363 option_type = ++spacer; // Set both to the empty string. 2364 } 2365 2366 if (os::obsolete_option(option)) { 2367 jio_fprintf(defaultStream::error_stream(), 2368 "Obsolete %s%soption: %s\n", option_type, spacer, 2369 option->optionString); 2370 return false; 2371 } else { 2372 jio_fprintf(defaultStream::error_stream(), 2373 "Unrecognized %s%soption: %s\n", option_type, spacer, 2374 option->optionString); 2375 return true; 2376 } 2377 } 2378 2379 static const char* user_assertion_options[] = { 2380 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2381 }; 2382 2383 static const char* system_assertion_options[] = { 2384 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2385 }; 2386 2387 bool Arguments::parse_uintx(const char* value, 2388 uintx* uintx_arg, 2389 uintx min_size) { 2390 2391 // Check the sign first since atojulong() parses only unsigned values. 2392 bool value_is_positive = !(*value == '-'); 2393 2394 if (value_is_positive) { 2395 julong n; 2396 bool good_return = atojulong(value, &n); 2397 if (good_return) { 2398 bool above_minimum = n >= min_size; 2399 bool value_is_too_large = n > max_uintx; 2400 2401 if (above_minimum && !value_is_too_large) { 2402 *uintx_arg = n; 2403 return true; 2404 } 2405 } 2406 } 2407 return false; 2408 } 2409 2410 unsigned int addreads_count = 0; 2411 unsigned int addexports_count = 0; 2412 unsigned int addopens_count = 0; 2413 unsigned int addmods_count = 0; 2414 unsigned int patch_mod_count = 0; 2415 2416 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2417 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2418 char* property = AllocateHeap(prop_len, mtArguments); 2419 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2420 if (ret < 0 || ret >= (int)prop_len) { 2421 FreeHeap(property); 2422 return false; 2423 } 2424 bool added = add_property(property, UnwriteableProperty, internal); 2425 FreeHeap(property); 2426 return added; 2427 } 2428 2429 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2430 const unsigned int props_count_limit = 1000; 2431 const int max_digits = 3; 2432 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2433 2434 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2435 if (count < props_count_limit) { 2436 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2437 char* property = AllocateHeap(prop_len, mtArguments); 2438 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2439 if (ret < 0 || ret >= (int)prop_len) { 2440 FreeHeap(property); 2441 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2442 return false; 2443 } 2444 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2445 FreeHeap(property); 2446 return added; 2447 } 2448 2449 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2450 return false; 2451 } 2452 2453 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2454 julong* long_arg, 2455 julong min_size, 2456 julong max_size) { 2457 if (!atojulong(s, long_arg)) return arg_unreadable; 2458 return check_memory_size(*long_arg, min_size, max_size); 2459 } 2460 2461 // Parse JavaVMInitArgs structure 2462 2463 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2464 const JavaVMInitArgs *java_options_args, 2465 const JavaVMInitArgs *cmd_line_args) { 2466 bool patch_mod_javabase = false; 2467 2468 // Save default settings for some mode flags 2469 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2470 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2471 Arguments::_ClipInlining = ClipInlining; 2472 Arguments::_BackgroundCompilation = BackgroundCompilation; 2473 if (TieredCompilation) { 2474 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2475 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2476 } 2477 2478 // Setup flags for mixed which is the default 2479 set_mode_flags(_mixed); 2480 2481 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2482 // variable (if present). 2483 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2484 if (result != JNI_OK) { 2485 return result; 2486 } 2487 2488 // Parse args structure generated from the command line flags. 2489 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2490 if (result != JNI_OK) { 2491 return result; 2492 } 2493 2494 // Parse args structure generated from the _JAVA_OPTIONS environment 2495 // variable (if present) (mimics classic VM) 2496 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2497 if (result != JNI_OK) { 2498 return result; 2499 } 2500 2501 // We need to ensure processor and memory resources have been properly 2502 // configured - which may rely on arguments we just processed - before 2503 // doing the final argument processing. Any argument processing that 2504 // needs to know about processor and memory resources must occur after 2505 // this point. 2506 2507 os::init_container_support(); 2508 2509 // Do final processing now that all arguments have been parsed 2510 result = finalize_vm_init_args(patch_mod_javabase); 2511 if (result != JNI_OK) { 2512 return result; 2513 } 2514 2515 return JNI_OK; 2516 } 2517 2518 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2519 // represents a valid JDWP agent. is_path==true denotes that we 2520 // are dealing with -agentpath (case where name is a path), otherwise with 2521 // -agentlib 2522 bool valid_jdwp_agent(char *name, bool is_path) { 2523 char *_name; 2524 const char *_jdwp = "jdwp"; 2525 size_t _len_jdwp, _len_prefix; 2526 2527 if (is_path) { 2528 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2529 return false; 2530 } 2531 2532 _name++; // skip past last path separator 2533 _len_prefix = strlen(JNI_LIB_PREFIX); 2534 2535 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2536 return false; 2537 } 2538 2539 _name += _len_prefix; 2540 _len_jdwp = strlen(_jdwp); 2541 2542 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2543 _name += _len_jdwp; 2544 } 2545 else { 2546 return false; 2547 } 2548 2549 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2550 return false; 2551 } 2552 2553 return true; 2554 } 2555 2556 if (strcmp(name, _jdwp) == 0) { 2557 return true; 2558 } 2559 2560 return false; 2561 } 2562 2563 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2564 // --patch-module=<module>=<file>(<pathsep><file>)* 2565 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2566 // Find the equal sign between the module name and the path specification 2567 const char* module_equal = strchr(patch_mod_tail, '='); 2568 if (module_equal == NULL) { 2569 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2570 return JNI_ERR; 2571 } else { 2572 // Pick out the module name 2573 size_t module_len = module_equal - patch_mod_tail; 2574 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2575 if (module_name != NULL) { 2576 memcpy(module_name, patch_mod_tail, module_len); 2577 *(module_name + module_len) = '\0'; 2578 // The path piece begins one past the module_equal sign 2579 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2580 FREE_C_HEAP_ARRAY(char, module_name); 2581 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2582 return JNI_ENOMEM; 2583 } 2584 } else { 2585 return JNI_ENOMEM; 2586 } 2587 } 2588 return JNI_OK; 2589 } 2590 2591 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2592 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2593 // The min and max sizes match the values in globals.hpp, but scaled 2594 // with K. The values have been chosen so that alignment with page 2595 // size doesn't change the max value, which makes the conversions 2596 // back and forth between Xss value and ThreadStackSize value easier. 2597 // The values have also been chosen to fit inside a 32-bit signed type. 2598 const julong min_ThreadStackSize = 0; 2599 const julong max_ThreadStackSize = 1 * M; 2600 2601 const julong min_size = min_ThreadStackSize * K; 2602 const julong max_size = max_ThreadStackSize * K; 2603 2604 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2605 2606 julong size = 0; 2607 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2608 if (errcode != arg_in_range) { 2609 bool silent = (option == NULL); // Allow testing to silence error messages 2610 if (!silent) { 2611 jio_fprintf(defaultStream::error_stream(), 2612 "Invalid thread stack size: %s\n", option->optionString); 2613 describe_range_error(errcode); 2614 } 2615 return JNI_EINVAL; 2616 } 2617 2618 // Internally track ThreadStackSize in units of 1024 bytes. 2619 const julong size_aligned = align_up(size, K); 2620 assert(size <= size_aligned, 2621 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2622 size, size_aligned); 2623 2624 const julong size_in_K = size_aligned / K; 2625 assert(size_in_K < (julong)max_intx, 2626 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2627 size_in_K); 2628 2629 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2630 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2631 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2632 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2633 max_expanded, size_in_K); 2634 2635 *out_ThreadStackSize = (intx)size_in_K; 2636 2637 return JNI_OK; 2638 } 2639 2640 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2641 // For match_option to return remaining or value part of option string 2642 const char* tail; 2643 2644 // iterate over arguments 2645 for (int index = 0; index < args->nOptions; index++) { 2646 bool is_absolute_path = false; // for -agentpath vs -agentlib 2647 2648 const JavaVMOption* option = args->options + index; 2649 2650 if (!match_option(option, "-Djava.class.path", &tail) && 2651 !match_option(option, "-Dsun.java.command", &tail) && 2652 !match_option(option, "-Dsun.java.launcher", &tail)) { 2653 2654 // add all jvm options to the jvm_args string. This string 2655 // is used later to set the java.vm.args PerfData string constant. 2656 // the -Djava.class.path and the -Dsun.java.command options are 2657 // omitted from jvm_args string as each have their own PerfData 2658 // string constant object. 2659 build_jvm_args(option->optionString); 2660 } 2661 2662 // -verbose:[class/module/gc/jni] 2663 if (match_option(option, "-verbose", &tail)) { 2664 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2665 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2666 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2667 } else if (!strcmp(tail, ":module")) { 2668 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2669 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2670 } else if (!strcmp(tail, ":gc")) { 2671 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2672 } else if (!strcmp(tail, ":jni")) { 2673 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2674 return JNI_EINVAL; 2675 } 2676 } 2677 // -da / -ea / -disableassertions / -enableassertions 2678 // These accept an optional class/package name separated by a colon, e.g., 2679 // -da:java.lang.Thread. 2680 } else if (match_option(option, user_assertion_options, &tail, true)) { 2681 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2682 if (*tail == '\0') { 2683 JavaAssertions::setUserClassDefault(enable); 2684 } else { 2685 assert(*tail == ':', "bogus match by match_option()"); 2686 JavaAssertions::addOption(tail + 1, enable); 2687 } 2688 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2689 } else if (match_option(option, system_assertion_options, &tail, false)) { 2690 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2691 JavaAssertions::setSystemClassDefault(enable); 2692 // -bootclasspath: 2693 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2694 jio_fprintf(defaultStream::output_stream(), 2695 "-Xbootclasspath is no longer a supported option.\n"); 2696 return JNI_EINVAL; 2697 // -bootclasspath/a: 2698 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2699 Arguments::append_sysclasspath(tail); 2700 // -bootclasspath/p: 2701 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2702 jio_fprintf(defaultStream::output_stream(), 2703 "-Xbootclasspath/p is no longer a supported option.\n"); 2704 return JNI_EINVAL; 2705 // -Xrun 2706 } else if (match_option(option, "-Xrun", &tail)) { 2707 if (tail != NULL) { 2708 const char* pos = strchr(tail, ':'); 2709 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2710 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2711 jio_snprintf(name, len + 1, "%s", tail); 2712 2713 char *options = NULL; 2714 if(pos != NULL) { 2715 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2716 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2717 } 2718 #if !INCLUDE_JVMTI 2719 if (strcmp(name, "jdwp") == 0) { 2720 jio_fprintf(defaultStream::error_stream(), 2721 "Debugging agents are not supported in this VM\n"); 2722 return JNI_ERR; 2723 } 2724 #endif // !INCLUDE_JVMTI 2725 add_init_library(name, options); 2726 } 2727 } else if (match_option(option, "--add-reads=", &tail)) { 2728 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2729 return JNI_ENOMEM; 2730 } 2731 } else if (match_option(option, "--add-exports=", &tail)) { 2732 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2733 return JNI_ENOMEM; 2734 } 2735 } else if (match_option(option, "--add-opens=", &tail)) { 2736 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2737 return JNI_ENOMEM; 2738 } 2739 } else if (match_option(option, "--add-modules=", &tail)) { 2740 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2741 return JNI_ENOMEM; 2742 } 2743 } else if (match_option(option, "--limit-modules=", &tail)) { 2744 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2745 return JNI_ENOMEM; 2746 } 2747 } else if (match_option(option, "--module-path=", &tail)) { 2748 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2749 return JNI_ENOMEM; 2750 } 2751 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2752 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2753 return JNI_ENOMEM; 2754 } 2755 } else if (match_option(option, "--patch-module=", &tail)) { 2756 // --patch-module=<module>=<file>(<pathsep><file>)* 2757 int res = process_patch_mod_option(tail, patch_mod_javabase); 2758 if (res != JNI_OK) { 2759 return res; 2760 } 2761 } else if (match_option(option, "--illegal-access=", &tail)) { 2762 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2763 return JNI_ENOMEM; 2764 } 2765 // -agentlib and -agentpath 2766 } else if (match_option(option, "-agentlib:", &tail) || 2767 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2768 if(tail != NULL) { 2769 const char* pos = strchr(tail, '='); 2770 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2771 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2772 name[len] = '\0'; 2773 2774 char *options = NULL; 2775 if(pos != NULL) { 2776 options = os::strdup_check_oom(pos + 1, mtArguments); 2777 } 2778 #if !INCLUDE_JVMTI 2779 if (valid_jdwp_agent(name, is_absolute_path)) { 2780 jio_fprintf(defaultStream::error_stream(), 2781 "Debugging agents are not supported in this VM\n"); 2782 return JNI_ERR; 2783 } 2784 #endif // !INCLUDE_JVMTI 2785 add_init_agent(name, options, is_absolute_path); 2786 } 2787 // -javaagent 2788 } else if (match_option(option, "-javaagent:", &tail)) { 2789 #if !INCLUDE_JVMTI 2790 jio_fprintf(defaultStream::error_stream(), 2791 "Instrumentation agents are not supported in this VM\n"); 2792 return JNI_ERR; 2793 #else 2794 if (tail != NULL) { 2795 size_t length = strlen(tail) + 1; 2796 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2797 jio_snprintf(options, length, "%s", tail); 2798 add_init_agent("instrument", options, false); 2799 // java agents need module java.instrument 2800 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2801 return JNI_ENOMEM; 2802 } 2803 } 2804 #endif // !INCLUDE_JVMTI 2805 // -Xnoclassgc 2806 } else if (match_option(option, "-Xnoclassgc")) { 2807 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2808 return JNI_EINVAL; 2809 } 2810 // -Xconcgc 2811 } else if (match_option(option, "-Xconcgc")) { 2812 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2813 return JNI_EINVAL; 2814 } 2815 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2816 // -Xnoconcgc 2817 } else if (match_option(option, "-Xnoconcgc")) { 2818 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2819 return JNI_EINVAL; 2820 } 2821 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2822 // -Xbatch 2823 } else if (match_option(option, "-Xbatch")) { 2824 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2825 return JNI_EINVAL; 2826 } 2827 // -Xmn for compatibility with other JVM vendors 2828 } else if (match_option(option, "-Xmn", &tail)) { 2829 julong long_initial_young_size = 0; 2830 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2831 if (errcode != arg_in_range) { 2832 jio_fprintf(defaultStream::error_stream(), 2833 "Invalid initial young generation size: %s\n", option->optionString); 2834 describe_range_error(errcode); 2835 return JNI_EINVAL; 2836 } 2837 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2838 return JNI_EINVAL; 2839 } 2840 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2841 return JNI_EINVAL; 2842 } 2843 // -Xms 2844 } else if (match_option(option, "-Xms", &tail)) { 2845 julong long_initial_heap_size = 0; 2846 // an initial heap size of 0 means automatically determine 2847 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2848 if (errcode != arg_in_range) { 2849 jio_fprintf(defaultStream::error_stream(), 2850 "Invalid initial heap size: %s\n", option->optionString); 2851 describe_range_error(errcode); 2852 return JNI_EINVAL; 2853 } 2854 set_min_heap_size((size_t)long_initial_heap_size); 2855 // Currently the minimum size and the initial heap sizes are the same. 2856 // Can be overridden with -XX:InitialHeapSize. 2857 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2858 return JNI_EINVAL; 2859 } 2860 // -Xmx 2861 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2862 julong long_max_heap_size = 0; 2863 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2864 if (errcode != arg_in_range) { 2865 jio_fprintf(defaultStream::error_stream(), 2866 "Invalid maximum heap size: %s\n", option->optionString); 2867 describe_range_error(errcode); 2868 return JNI_EINVAL; 2869 } 2870 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2871 return JNI_EINVAL; 2872 } 2873 // Xmaxf 2874 } else if (match_option(option, "-Xmaxf", &tail)) { 2875 char* err; 2876 int maxf = (int)(strtod(tail, &err) * 100); 2877 if (*err != '\0' || *tail == '\0') { 2878 jio_fprintf(defaultStream::error_stream(), 2879 "Bad max heap free percentage size: %s\n", 2880 option->optionString); 2881 return JNI_EINVAL; 2882 } else { 2883 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2884 return JNI_EINVAL; 2885 } 2886 } 2887 // Xminf 2888 } else if (match_option(option, "-Xminf", &tail)) { 2889 char* err; 2890 int minf = (int)(strtod(tail, &err) * 100); 2891 if (*err != '\0' || *tail == '\0') { 2892 jio_fprintf(defaultStream::error_stream(), 2893 "Bad min heap free percentage size: %s\n", 2894 option->optionString); 2895 return JNI_EINVAL; 2896 } else { 2897 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2898 return JNI_EINVAL; 2899 } 2900 } 2901 // -Xss 2902 } else if (match_option(option, "-Xss", &tail)) { 2903 intx value = 0; 2904 jint err = parse_xss(option, tail, &value); 2905 if (err != JNI_OK) { 2906 return err; 2907 } 2908 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != Flag::SUCCESS) { 2909 return JNI_EINVAL; 2910 } 2911 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2912 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2913 julong long_ReservedCodeCacheSize = 0; 2914 2915 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2916 if (errcode != arg_in_range) { 2917 jio_fprintf(defaultStream::error_stream(), 2918 "Invalid maximum code cache size: %s.\n", option->optionString); 2919 return JNI_EINVAL; 2920 } 2921 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 2922 return JNI_EINVAL; 2923 } 2924 // -green 2925 } else if (match_option(option, "-green")) { 2926 jio_fprintf(defaultStream::error_stream(), 2927 "Green threads support not available\n"); 2928 return JNI_EINVAL; 2929 // -native 2930 } else if (match_option(option, "-native")) { 2931 // HotSpot always uses native threads, ignore silently for compatibility 2932 // -Xrs 2933 } else if (match_option(option, "-Xrs")) { 2934 // Classic/EVM option, new functionality 2935 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 2936 return JNI_EINVAL; 2937 } 2938 // -Xprof 2939 } else if (match_option(option, "-Xprof")) { 2940 char version[256]; 2941 // Obsolete in JDK 10 2942 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2943 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2944 // -Xconcurrentio 2945 } else if (match_option(option, "-Xconcurrentio")) { 2946 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 2947 return JNI_EINVAL; 2948 } 2949 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2950 return JNI_EINVAL; 2951 } 2952 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 2953 return JNI_EINVAL; 2954 } 2955 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 2956 return JNI_EINVAL; 2957 } 2958 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 2959 return JNI_EINVAL; 2960 } 2961 2962 // -Xinternalversion 2963 } else if (match_option(option, "-Xinternalversion")) { 2964 jio_fprintf(defaultStream::output_stream(), "%s\n", 2965 VM_Version::internal_vm_info_string()); 2966 vm_exit(0); 2967 #ifndef PRODUCT 2968 // -Xprintflags 2969 } else if (match_option(option, "-Xprintflags")) { 2970 CommandLineFlags::printFlags(tty, false); 2971 vm_exit(0); 2972 #endif 2973 // -D 2974 } else if (match_option(option, "-D", &tail)) { 2975 const char* value; 2976 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2977 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2978 // abort if -Djava.endorsed.dirs is set 2979 jio_fprintf(defaultStream::output_stream(), 2980 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2981 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2982 return JNI_EINVAL; 2983 } 2984 if (match_option(option, "-Djava.ext.dirs=", &value) && 2985 *value != '\0' && strcmp(value, "\"\"") != 0) { 2986 // abort if -Djava.ext.dirs is set 2987 jio_fprintf(defaultStream::output_stream(), 2988 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2989 return JNI_EINVAL; 2990 } 2991 // Check for module related properties. They must be set using the modules 2992 // options. For example: use "--add-modules=java.sql", not 2993 // "-Djdk.module.addmods=java.sql" 2994 if (is_internal_module_property(option->optionString + 2)) { 2995 needs_module_property_warning = true; 2996 continue; 2997 } 2998 2999 if (!add_property(tail)) { 3000 return JNI_ENOMEM; 3001 } 3002 // Out of the box management support 3003 if (match_option(option, "-Dcom.sun.management", &tail)) { 3004 #if INCLUDE_MANAGEMENT 3005 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3006 return JNI_EINVAL; 3007 } 3008 // management agent in module jdk.management.agent 3009 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3010 return JNI_ENOMEM; 3011 } 3012 #else 3013 jio_fprintf(defaultStream::output_stream(), 3014 "-Dcom.sun.management is not supported in this VM.\n"); 3015 return JNI_ERR; 3016 #endif 3017 } 3018 // -Xint 3019 } else if (match_option(option, "-Xint")) { 3020 set_mode_flags(_int); 3021 // -Xmixed 3022 } else if (match_option(option, "-Xmixed")) { 3023 set_mode_flags(_mixed); 3024 // -Xcomp 3025 } else if (match_option(option, "-Xcomp")) { 3026 // for testing the compiler; turn off all flags that inhibit compilation 3027 set_mode_flags(_comp); 3028 // -Xshare:dump 3029 } else if (match_option(option, "-Xshare:dump")) { 3030 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3031 return JNI_EINVAL; 3032 } 3033 set_mode_flags(_int); // Prevent compilation, which creates objects 3034 // -Xshare:on 3035 } else if (match_option(option, "-Xshare:on")) { 3036 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3037 return JNI_EINVAL; 3038 } 3039 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3040 return JNI_EINVAL; 3041 } 3042 // -Xshare:auto 3043 } else if (match_option(option, "-Xshare:auto")) { 3044 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3045 return JNI_EINVAL; 3046 } 3047 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3048 return JNI_EINVAL; 3049 } 3050 // -Xshare:off 3051 } else if (match_option(option, "-Xshare:off")) { 3052 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3053 return JNI_EINVAL; 3054 } 3055 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3056 return JNI_EINVAL; 3057 } 3058 // -Xverify 3059 } else if (match_option(option, "-Xverify", &tail)) { 3060 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3061 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3062 return JNI_EINVAL; 3063 } 3064 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3065 return JNI_EINVAL; 3066 } 3067 } else if (strcmp(tail, ":remote") == 0) { 3068 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3069 return JNI_EINVAL; 3070 } 3071 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3072 return JNI_EINVAL; 3073 } 3074 } else if (strcmp(tail, ":none") == 0) { 3075 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3076 return JNI_EINVAL; 3077 } 3078 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3079 return JNI_EINVAL; 3080 } 3081 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3082 return JNI_EINVAL; 3083 } 3084 // -Xdebug 3085 } else if (match_option(option, "-Xdebug")) { 3086 // note this flag has been used, then ignore 3087 set_xdebug_mode(true); 3088 // -Xnoagent 3089 } else if (match_option(option, "-Xnoagent")) { 3090 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3091 } else if (match_option(option, "-Xloggc:", &tail)) { 3092 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3093 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3094 _gc_log_filename = os::strdup_check_oom(tail); 3095 } else if (match_option(option, "-Xlog", &tail)) { 3096 bool ret = false; 3097 if (strcmp(tail, ":help") == 0) { 3098 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3099 vm_exit(0); 3100 } else if (strcmp(tail, ":disable") == 0) { 3101 LogConfiguration::disable_logging(); 3102 ret = true; 3103 } else if (*tail == '\0') { 3104 ret = LogConfiguration::parse_command_line_arguments(); 3105 assert(ret, "-Xlog without arguments should never fail to parse"); 3106 } else if (*tail == ':') { 3107 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3108 } 3109 if (ret == false) { 3110 jio_fprintf(defaultStream::error_stream(), 3111 "Invalid -Xlog option '-Xlog%s'\n", 3112 tail); 3113 return JNI_EINVAL; 3114 } 3115 // JNI hooks 3116 } else if (match_option(option, "-Xcheck", &tail)) { 3117 if (!strcmp(tail, ":jni")) { 3118 #if !INCLUDE_JNI_CHECK 3119 warning("JNI CHECKING is not supported in this VM"); 3120 #else 3121 CheckJNICalls = true; 3122 #endif // INCLUDE_JNI_CHECK 3123 } else if (is_bad_option(option, args->ignoreUnrecognized, 3124 "check")) { 3125 return JNI_EINVAL; 3126 } 3127 } else if (match_option(option, "vfprintf")) { 3128 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3129 } else if (match_option(option, "exit")) { 3130 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3131 } else if (match_option(option, "abort")) { 3132 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3133 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3134 // and the last option wins. 3135 } else if (match_option(option, "-XX:+NeverTenure")) { 3136 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3137 return JNI_EINVAL; 3138 } 3139 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3140 return JNI_EINVAL; 3141 } 3142 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3143 return JNI_EINVAL; 3144 } 3145 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3146 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3147 return JNI_EINVAL; 3148 } 3149 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3150 return JNI_EINVAL; 3151 } 3152 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3153 return JNI_EINVAL; 3154 } 3155 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3156 uintx max_tenuring_thresh = 0; 3157 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3158 jio_fprintf(defaultStream::error_stream(), 3159 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3160 return JNI_EINVAL; 3161 } 3162 3163 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3164 return JNI_EINVAL; 3165 } 3166 3167 if (MaxTenuringThreshold == 0) { 3168 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3169 return JNI_EINVAL; 3170 } 3171 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3172 return JNI_EINVAL; 3173 } 3174 } else { 3175 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3176 return JNI_EINVAL; 3177 } 3178 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3179 return JNI_EINVAL; 3180 } 3181 } 3182 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3183 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3184 return JNI_EINVAL; 3185 } 3186 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3187 return JNI_EINVAL; 3188 } 3189 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3190 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3191 return JNI_EINVAL; 3192 } 3193 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3194 return JNI_EINVAL; 3195 } 3196 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3197 #if defined(DTRACE_ENABLED) 3198 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3199 return JNI_EINVAL; 3200 } 3201 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3202 return JNI_EINVAL; 3203 } 3204 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3205 return JNI_EINVAL; 3206 } 3207 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3208 return JNI_EINVAL; 3209 } 3210 #else // defined(DTRACE_ENABLED) 3211 jio_fprintf(defaultStream::error_stream(), 3212 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3213 return JNI_EINVAL; 3214 #endif // defined(DTRACE_ENABLED) 3215 #ifdef ASSERT 3216 } else if (match_option(option, "-XX:+FullGCALot")) { 3217 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3218 return JNI_EINVAL; 3219 } 3220 // disable scavenge before parallel mark-compact 3221 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3222 return JNI_EINVAL; 3223 } 3224 #endif 3225 #if !INCLUDE_MANAGEMENT 3226 } else if (match_option(option, "-XX:+ManagementServer")) { 3227 jio_fprintf(defaultStream::error_stream(), 3228 "ManagementServer is not supported in this VM.\n"); 3229 return JNI_ERR; 3230 #endif // INCLUDE_MANAGEMENT 3231 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3232 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3233 // already been handled 3234 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3235 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3236 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3237 return JNI_EINVAL; 3238 } 3239 } 3240 // Unknown option 3241 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3242 return JNI_ERR; 3243 } 3244 } 3245 3246 // PrintSharedArchiveAndExit will turn on 3247 // -Xshare:on 3248 // -Xlog:class+path=info 3249 if (PrintSharedArchiveAndExit) { 3250 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3251 return JNI_EINVAL; 3252 } 3253 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3254 return JNI_EINVAL; 3255 } 3256 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3257 } 3258 3259 // Change the default value for flags which have different default values 3260 // when working with older JDKs. 3261 #ifdef LINUX 3262 if (JDK_Version::current().compare_major(6) <= 0 && 3263 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3264 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3265 } 3266 #endif // LINUX 3267 fix_appclasspath(); 3268 return JNI_OK; 3269 } 3270 3271 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3272 // For java.base check for duplicate --patch-module options being specified on the command line. 3273 // This check is only required for java.base, all other duplicate module specifications 3274 // will be checked during module system initialization. The module system initialization 3275 // will throw an ExceptionInInitializerError if this situation occurs. 3276 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3277 if (*patch_mod_javabase) { 3278 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3279 } else { 3280 *patch_mod_javabase = true; 3281 } 3282 } 3283 3284 // Create GrowableArray lazily, only if --patch-module has been specified 3285 if (_patch_mod_prefix == NULL) { 3286 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3287 } 3288 3289 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3290 } 3291 3292 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3293 // 3294 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3295 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3296 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3297 // path is treated as the current directory. 3298 // 3299 // This causes problems with CDS, which requires that all directories specified in the classpath 3300 // must be empty. In most cases, applications do NOT want to load classes from the current 3301 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3302 // scripts compatible with CDS. 3303 void Arguments::fix_appclasspath() { 3304 if (IgnoreEmptyClassPaths) { 3305 const char separator = *os::path_separator(); 3306 const char* src = _java_class_path->value(); 3307 3308 // skip over all the leading empty paths 3309 while (*src == separator) { 3310 src ++; 3311 } 3312 3313 char* copy = os::strdup_check_oom(src, mtArguments); 3314 3315 // trim all trailing empty paths 3316 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3317 *tail = '\0'; 3318 } 3319 3320 char from[3] = {separator, separator, '\0'}; 3321 char to [2] = {separator, '\0'}; 3322 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3323 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3324 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3325 } 3326 3327 _java_class_path->set_writeable_value(copy); 3328 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3329 } 3330 } 3331 3332 static bool has_jar_files(const char* directory) { 3333 DIR* dir = os::opendir(directory); 3334 if (dir == NULL) return false; 3335 3336 struct dirent *entry; 3337 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3338 bool hasJarFile = false; 3339 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3340 const char* name = entry->d_name; 3341 const char* ext = name + strlen(name) - 4; 3342 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3343 } 3344 FREE_C_HEAP_ARRAY(char, dbuf); 3345 os::closedir(dir); 3346 return hasJarFile ; 3347 } 3348 3349 static int check_non_empty_dirs(const char* path) { 3350 const char separator = *os::path_separator(); 3351 const char* const end = path + strlen(path); 3352 int nonEmptyDirs = 0; 3353 while (path < end) { 3354 const char* tmp_end = strchr(path, separator); 3355 if (tmp_end == NULL) { 3356 if (has_jar_files(path)) { 3357 nonEmptyDirs++; 3358 jio_fprintf(defaultStream::output_stream(), 3359 "Non-empty directory: %s\n", path); 3360 } 3361 path = end; 3362 } else { 3363 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3364 memcpy(dirpath, path, tmp_end - path); 3365 dirpath[tmp_end - path] = '\0'; 3366 if (has_jar_files(dirpath)) { 3367 nonEmptyDirs++; 3368 jio_fprintf(defaultStream::output_stream(), 3369 "Non-empty directory: %s\n", dirpath); 3370 } 3371 FREE_C_HEAP_ARRAY(char, dirpath); 3372 path = tmp_end + 1; 3373 } 3374 } 3375 return nonEmptyDirs; 3376 } 3377 3378 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3379 // check if the default lib/endorsed directory exists; if so, error 3380 char path[JVM_MAXPATHLEN]; 3381 const char* fileSep = os::file_separator(); 3382 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3383 3384 if (CheckEndorsedAndExtDirs) { 3385 int nonEmptyDirs = 0; 3386 // check endorsed directory 3387 nonEmptyDirs += check_non_empty_dirs(path); 3388 // check the extension directories 3389 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3390 if (nonEmptyDirs > 0) { 3391 return JNI_ERR; 3392 } 3393 } 3394 3395 DIR* dir = os::opendir(path); 3396 if (dir != NULL) { 3397 jio_fprintf(defaultStream::output_stream(), 3398 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3399 "in modular form will be supported via the concept of upgradeable modules.\n"); 3400 os::closedir(dir); 3401 return JNI_ERR; 3402 } 3403 3404 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3405 dir = os::opendir(path); 3406 if (dir != NULL) { 3407 jio_fprintf(defaultStream::output_stream(), 3408 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3409 "Use -classpath instead.\n."); 3410 os::closedir(dir); 3411 return JNI_ERR; 3412 } 3413 3414 // This must be done after all arguments have been processed 3415 // and the container support has been initialized since AggressiveHeap 3416 // relies on the amount of total memory available. 3417 if (AggressiveHeap) { 3418 jint result = set_aggressive_heap_flags(); 3419 if (result != JNI_OK) { 3420 return result; 3421 } 3422 } 3423 3424 // This must be done after all arguments have been processed. 3425 // java_compiler() true means set to "NONE" or empty. 3426 if (java_compiler() && !xdebug_mode()) { 3427 // For backwards compatibility, we switch to interpreted mode if 3428 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3429 // not specified. 3430 set_mode_flags(_int); 3431 } 3432 3433 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3434 // but like -Xint, leave compilation thresholds unaffected. 3435 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3436 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3437 set_mode_flags(_int); 3438 } 3439 3440 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3441 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3442 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3443 } 3444 3445 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3446 // Don't degrade server performance for footprint 3447 if (FLAG_IS_DEFAULT(UseLargePages) && 3448 MaxHeapSize < LargePageHeapSizeThreshold) { 3449 // No need for large granularity pages w/small heaps. 3450 // Note that large pages are enabled/disabled for both the 3451 // Java heap and the code cache. 3452 FLAG_SET_DEFAULT(UseLargePages, false); 3453 } 3454 3455 #elif defined(COMPILER2) 3456 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3457 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3458 } 3459 #endif 3460 3461 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3462 UNSUPPORTED_OPTION(ProfileInterpreter); 3463 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3464 #endif 3465 3466 #ifndef TIERED 3467 // Tiered compilation is undefined. 3468 UNSUPPORTED_OPTION(TieredCompilation); 3469 #endif 3470 3471 #if INCLUDE_JVMCI 3472 if (EnableJVMCI && 3473 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3474 return JNI_ENOMEM; 3475 } 3476 #endif 3477 3478 // If we are running in a headless jre, force java.awt.headless property 3479 // to be true unless the property has already been set. 3480 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3481 if (os::is_headless_jre()) { 3482 const char* headless = Arguments::get_property("java.awt.headless"); 3483 if (headless == NULL) { 3484 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3485 if (headless_env == NULL) { 3486 if (!add_property("java.awt.headless=true")) { 3487 return JNI_ENOMEM; 3488 } 3489 } else { 3490 char buffer[256]; 3491 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3492 if (!add_property(buffer)) { 3493 return JNI_ENOMEM; 3494 } 3495 } 3496 } 3497 } 3498 3499 if (!check_vm_args_consistency()) { 3500 return JNI_ERR; 3501 } 3502 3503 #if INCLUDE_JVMCI 3504 if (UseJVMCICompiler) { 3505 Compilation_mode = CompMode_server; 3506 } 3507 #endif 3508 3509 #if INCLUDE_CDS 3510 if (DumpSharedSpaces) { 3511 // Disable biased locking now as it interferes with the clean up of 3512 // the archived Klasses and Java string objects (at dump time only). 3513 UseBiasedLocking = false; 3514 } 3515 if (UseSharedSpaces && patch_mod_javabase) { 3516 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3517 } 3518 #endif 3519 3520 return JNI_OK; 3521 } 3522 3523 // Helper class for controlling the lifetime of JavaVMInitArgs 3524 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3525 // deleted on the destruction of the ScopedVMInitArgs object. 3526 class ScopedVMInitArgs : public StackObj { 3527 private: 3528 JavaVMInitArgs _args; 3529 char* _container_name; 3530 bool _is_set; 3531 char* _vm_options_file_arg; 3532 3533 public: 3534 ScopedVMInitArgs(const char *container_name) { 3535 _args.version = JNI_VERSION_1_2; 3536 _args.nOptions = 0; 3537 _args.options = NULL; 3538 _args.ignoreUnrecognized = false; 3539 _container_name = (char *)container_name; 3540 _is_set = false; 3541 _vm_options_file_arg = NULL; 3542 } 3543 3544 // Populates the JavaVMInitArgs object represented by this 3545 // ScopedVMInitArgs object with the arguments in options. The 3546 // allocated memory is deleted by the destructor. If this method 3547 // returns anything other than JNI_OK, then this object is in a 3548 // partially constructed state, and should be abandoned. 3549 jint set_args(GrowableArray<JavaVMOption>* options) { 3550 _is_set = true; 3551 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3552 JavaVMOption, options->length(), mtArguments); 3553 if (options_arr == NULL) { 3554 return JNI_ENOMEM; 3555 } 3556 _args.options = options_arr; 3557 3558 for (int i = 0; i < options->length(); i++) { 3559 options_arr[i] = options->at(i); 3560 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3561 if (options_arr[i].optionString == NULL) { 3562 // Rely on the destructor to do cleanup. 3563 _args.nOptions = i; 3564 return JNI_ENOMEM; 3565 } 3566 } 3567 3568 _args.nOptions = options->length(); 3569 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3570 return JNI_OK; 3571 } 3572 3573 JavaVMInitArgs* get() { return &_args; } 3574 char* container_name() { return _container_name; } 3575 bool is_set() { return _is_set; } 3576 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3577 char* vm_options_file_arg() { return _vm_options_file_arg; } 3578 3579 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3580 if (_vm_options_file_arg != NULL) { 3581 os::free(_vm_options_file_arg); 3582 } 3583 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3584 } 3585 3586 ~ScopedVMInitArgs() { 3587 if (_vm_options_file_arg != NULL) { 3588 os::free(_vm_options_file_arg); 3589 } 3590 if (_args.options == NULL) return; 3591 for (int i = 0; i < _args.nOptions; i++) { 3592 os::free(_args.options[i].optionString); 3593 } 3594 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3595 } 3596 3597 // Insert options into this option list, to replace option at 3598 // vm_options_file_pos (-XX:VMOptionsFile) 3599 jint insert(const JavaVMInitArgs* args, 3600 const JavaVMInitArgs* args_to_insert, 3601 const int vm_options_file_pos) { 3602 assert(_args.options == NULL, "shouldn't be set yet"); 3603 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3604 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3605 3606 int length = args->nOptions + args_to_insert->nOptions - 1; 3607 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3608 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3609 for (int i = 0; i < args->nOptions; i++) { 3610 if (i == vm_options_file_pos) { 3611 // insert the new options starting at the same place as the 3612 // -XX:VMOptionsFile option 3613 for (int j = 0; j < args_to_insert->nOptions; j++) { 3614 options->push(args_to_insert->options[j]); 3615 } 3616 } else { 3617 options->push(args->options[i]); 3618 } 3619 } 3620 // make into options array 3621 jint result = set_args(options); 3622 delete options; 3623 return result; 3624 } 3625 }; 3626 3627 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3628 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3629 } 3630 3631 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3632 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3633 } 3634 3635 jint Arguments::parse_options_environment_variable(const char* name, 3636 ScopedVMInitArgs* vm_args) { 3637 char *buffer = ::getenv(name); 3638 3639 // Don't check this environment variable if user has special privileges 3640 // (e.g. unix su command). 3641 if (buffer == NULL || os::have_special_privileges()) { 3642 return JNI_OK; 3643 } 3644 3645 if ((buffer = os::strdup(buffer)) == NULL) { 3646 return JNI_ENOMEM; 3647 } 3648 3649 jio_fprintf(defaultStream::error_stream(), 3650 "Picked up %s: %s\n", name, buffer); 3651 3652 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3653 3654 os::free(buffer); 3655 return retcode; 3656 } 3657 3658 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3659 // read file into buffer 3660 int fd = ::open(file_name, O_RDONLY); 3661 if (fd < 0) { 3662 jio_fprintf(defaultStream::error_stream(), 3663 "Could not open options file '%s'\n", 3664 file_name); 3665 return JNI_ERR; 3666 } 3667 3668 struct stat stbuf; 3669 int retcode = os::stat(file_name, &stbuf); 3670 if (retcode != 0) { 3671 jio_fprintf(defaultStream::error_stream(), 3672 "Could not stat options file '%s'\n", 3673 file_name); 3674 os::close(fd); 3675 return JNI_ERR; 3676 } 3677 3678 if (stbuf.st_size == 0) { 3679 // tell caller there is no option data and that is ok 3680 os::close(fd); 3681 return JNI_OK; 3682 } 3683 3684 // '+ 1' for NULL termination even with max bytes 3685 size_t bytes_alloc = stbuf.st_size + 1; 3686 3687 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3688 if (NULL == buf) { 3689 jio_fprintf(defaultStream::error_stream(), 3690 "Could not allocate read buffer for options file parse\n"); 3691 os::close(fd); 3692 return JNI_ENOMEM; 3693 } 3694 3695 memset(buf, 0, bytes_alloc); 3696 3697 // Fill buffer 3698 // Use ::read() instead of os::read because os::read() 3699 // might do a thread state transition 3700 // and it is too early for that here 3701 3702 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3703 os::close(fd); 3704 if (bytes_read < 0) { 3705 FREE_C_HEAP_ARRAY(char, buf); 3706 jio_fprintf(defaultStream::error_stream(), 3707 "Could not read options file '%s'\n", file_name); 3708 return JNI_ERR; 3709 } 3710 3711 if (bytes_read == 0) { 3712 // tell caller there is no option data and that is ok 3713 FREE_C_HEAP_ARRAY(char, buf); 3714 return JNI_OK; 3715 } 3716 3717 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3718 3719 FREE_C_HEAP_ARRAY(char, buf); 3720 return retcode; 3721 } 3722 3723 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3724 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3725 3726 // some pointers to help with parsing 3727 char *buffer_end = buffer + buf_len; 3728 char *opt_hd = buffer; 3729 char *wrt = buffer; 3730 char *rd = buffer; 3731 3732 // parse all options 3733 while (rd < buffer_end) { 3734 // skip leading white space from the input string 3735 while (rd < buffer_end && isspace(*rd)) { 3736 rd++; 3737 } 3738 3739 if (rd >= buffer_end) { 3740 break; 3741 } 3742 3743 // Remember this is where we found the head of the token. 3744 opt_hd = wrt; 3745 3746 // Tokens are strings of non white space characters separated 3747 // by one or more white spaces. 3748 while (rd < buffer_end && !isspace(*rd)) { 3749 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3750 int quote = *rd; // matching quote to look for 3751 rd++; // don't copy open quote 3752 while (rd < buffer_end && *rd != quote) { 3753 // include everything (even spaces) 3754 // up until the close quote 3755 *wrt++ = *rd++; // copy to option string 3756 } 3757 3758 if (rd < buffer_end) { 3759 rd++; // don't copy close quote 3760 } else { 3761 // did not see closing quote 3762 jio_fprintf(defaultStream::error_stream(), 3763 "Unmatched quote in %s\n", name); 3764 delete options; 3765 return JNI_ERR; 3766 } 3767 } else { 3768 *wrt++ = *rd++; // copy to option string 3769 } 3770 } 3771 3772 // steal a white space character and set it to NULL 3773 *wrt++ = '\0'; 3774 // We now have a complete token 3775 3776 JavaVMOption option; 3777 option.optionString = opt_hd; 3778 option.extraInfo = NULL; 3779 3780 options->append(option); // Fill in option 3781 3782 rd++; // Advance to next character 3783 } 3784 3785 // Fill out JavaVMInitArgs structure. 3786 jint status = vm_args->set_args(options); 3787 3788 delete options; 3789 return status; 3790 } 3791 3792 void Arguments::set_shared_spaces_flags() { 3793 if (DumpSharedSpaces) { 3794 if (FailOverToOldVerifier) { 3795 // Don't fall back to the old verifier on verification failure. If a 3796 // class fails verification with the split verifier, it might fail the 3797 // CDS runtime verifier constraint check. In that case, we don't want 3798 // to share the class. We only archive classes that pass the split verifier. 3799 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3800 } 3801 3802 if (RequireSharedSpaces) { 3803 warning("Cannot dump shared archive while using shared archive"); 3804 } 3805 UseSharedSpaces = false; 3806 #ifdef _LP64 3807 if (!UseCompressedOops || !UseCompressedClassPointers) { 3808 vm_exit_during_initialization( 3809 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3810 } 3811 } else { 3812 if (!UseCompressedOops || !UseCompressedClassPointers) { 3813 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3814 } 3815 #endif 3816 } 3817 } 3818 3819 // Sharing support 3820 // Construct the path to the archive 3821 static char* get_shared_archive_path() { 3822 char *shared_archive_path; 3823 if (SharedArchiveFile == NULL) { 3824 char jvm_path[JVM_MAXPATHLEN]; 3825 os::jvm_path(jvm_path, sizeof(jvm_path)); 3826 char *end = strrchr(jvm_path, *os::file_separator()); 3827 if (end != NULL) *end = '\0'; 3828 size_t jvm_path_len = strlen(jvm_path); 3829 size_t file_sep_len = strlen(os::file_separator()); 3830 const size_t len = jvm_path_len + file_sep_len + 20; 3831 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3832 if (shared_archive_path != NULL) { 3833 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3834 jvm_path, os::file_separator()); 3835 } 3836 } else { 3837 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3838 } 3839 return shared_archive_path; 3840 } 3841 3842 #ifndef PRODUCT 3843 // Determine whether LogVMOutput should be implicitly turned on. 3844 static bool use_vm_log() { 3845 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3846 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3847 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3848 PrintAssembly || TraceDeoptimization || TraceDependencies || 3849 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3850 return true; 3851 } 3852 3853 #ifdef COMPILER1 3854 if (PrintC1Statistics) { 3855 return true; 3856 } 3857 #endif // COMPILER1 3858 3859 #ifdef COMPILER2 3860 if (PrintOptoAssembly || PrintOptoStatistics) { 3861 return true; 3862 } 3863 #endif // COMPILER2 3864 3865 return false; 3866 } 3867 3868 #endif // PRODUCT 3869 3870 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3871 for (int index = 0; index < args->nOptions; index++) { 3872 const JavaVMOption* option = args->options + index; 3873 const char* tail; 3874 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3875 return true; 3876 } 3877 } 3878 return false; 3879 } 3880 3881 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3882 const char* vm_options_file, 3883 const int vm_options_file_pos, 3884 ScopedVMInitArgs* vm_options_file_args, 3885 ScopedVMInitArgs* args_out) { 3886 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3887 if (code != JNI_OK) { 3888 return code; 3889 } 3890 3891 if (vm_options_file_args->get()->nOptions < 1) { 3892 return JNI_OK; 3893 } 3894 3895 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3896 jio_fprintf(defaultStream::error_stream(), 3897 "A VM options file may not refer to a VM options file. " 3898 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3899 "options file '%s' in options container '%s' is an error.\n", 3900 vm_options_file_args->vm_options_file_arg(), 3901 vm_options_file_args->container_name()); 3902 return JNI_EINVAL; 3903 } 3904 3905 return args_out->insert(args, vm_options_file_args->get(), 3906 vm_options_file_pos); 3907 } 3908 3909 // Expand -XX:VMOptionsFile found in args_in as needed. 3910 // mod_args and args_out parameters may return values as needed. 3911 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3912 ScopedVMInitArgs* mod_args, 3913 JavaVMInitArgs** args_out) { 3914 jint code = match_special_option_and_act(args_in, mod_args); 3915 if (code != JNI_OK) { 3916 return code; 3917 } 3918 3919 if (mod_args->is_set()) { 3920 // args_in contains -XX:VMOptionsFile and mod_args contains the 3921 // original options from args_in along with the options expanded 3922 // from the VMOptionsFile. Return a short-hand to the caller. 3923 *args_out = mod_args->get(); 3924 } else { 3925 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3926 } 3927 return JNI_OK; 3928 } 3929 3930 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3931 ScopedVMInitArgs* args_out) { 3932 // Remaining part of option string 3933 const char* tail; 3934 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3935 3936 for (int index = 0; index < args->nOptions; index++) { 3937 const JavaVMOption* option = args->options + index; 3938 if (ArgumentsExt::process_options(option)) { 3939 continue; 3940 } 3941 if (match_option(option, "-XX:Flags=", &tail)) { 3942 Arguments::set_jvm_flags_file(tail); 3943 continue; 3944 } 3945 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3946 if (vm_options_file_args.found_vm_options_file_arg()) { 3947 jio_fprintf(defaultStream::error_stream(), 3948 "The option '%s' is already specified in the options " 3949 "container '%s' so the specification of '%s' in the " 3950 "same options container is an error.\n", 3951 vm_options_file_args.vm_options_file_arg(), 3952 vm_options_file_args.container_name(), 3953 option->optionString); 3954 return JNI_EINVAL; 3955 } 3956 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3957 // If there's a VMOptionsFile, parse that 3958 jint code = insert_vm_options_file(args, tail, index, 3959 &vm_options_file_args, args_out); 3960 if (code != JNI_OK) { 3961 return code; 3962 } 3963 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3964 if (args_out->is_set()) { 3965 // The VMOptions file inserted some options so switch 'args' 3966 // to the new set of options, and continue processing which 3967 // preserves "last option wins" semantics. 3968 args = args_out->get(); 3969 // The first option from the VMOptionsFile replaces the 3970 // current option. So we back track to process the 3971 // replacement option. 3972 index--; 3973 } 3974 continue; 3975 } 3976 if (match_option(option, "-XX:+PrintVMOptions")) { 3977 PrintVMOptions = true; 3978 continue; 3979 } 3980 if (match_option(option, "-XX:-PrintVMOptions")) { 3981 PrintVMOptions = false; 3982 continue; 3983 } 3984 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3985 IgnoreUnrecognizedVMOptions = true; 3986 continue; 3987 } 3988 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3989 IgnoreUnrecognizedVMOptions = false; 3990 continue; 3991 } 3992 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3993 CommandLineFlags::printFlags(tty, false); 3994 vm_exit(0); 3995 } 3996 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3997 #if INCLUDE_NMT 3998 // The launcher did not setup nmt environment variable properly. 3999 if (!MemTracker::check_launcher_nmt_support(tail)) { 4000 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4001 } 4002 4003 // Verify if nmt option is valid. 4004 if (MemTracker::verify_nmt_option()) { 4005 // Late initialization, still in single-threaded mode. 4006 if (MemTracker::tracking_level() >= NMT_summary) { 4007 MemTracker::init(); 4008 } 4009 } else { 4010 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4011 } 4012 continue; 4013 #else 4014 jio_fprintf(defaultStream::error_stream(), 4015 "Native Memory Tracking is not supported in this VM\n"); 4016 return JNI_ERR; 4017 #endif 4018 } 4019 4020 #ifndef PRODUCT 4021 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4022 CommandLineFlags::printFlags(tty, true); 4023 vm_exit(0); 4024 } 4025 #endif 4026 4027 if (match_option(option, "-XX:+UseAppCDS")) { 4028 Flag* flag = Flag::find_flag("SharedArchiveFile", 17, true, true); 4029 if (flag->is_diagnostic()) { 4030 flag->clear_diagnostic(); 4031 } 4032 continue; 4033 } 4034 } 4035 return JNI_OK; 4036 } 4037 4038 static void print_options(const JavaVMInitArgs *args) { 4039 const char* tail; 4040 for (int index = 0; index < args->nOptions; index++) { 4041 const JavaVMOption *option = args->options + index; 4042 if (match_option(option, "-XX:", &tail)) { 4043 logOption(tail); 4044 } 4045 } 4046 } 4047 4048 bool Arguments::handle_deprecated_print_gc_flags() { 4049 if (PrintGC) { 4050 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4051 } 4052 if (PrintGCDetails) { 4053 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4054 } 4055 4056 if (_gc_log_filename != NULL) { 4057 // -Xloggc was used to specify a filename 4058 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4059 4060 LogTarget(Error, logging) target; 4061 LogStream errstream(target); 4062 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4063 } else if (PrintGC || PrintGCDetails) { 4064 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4065 } 4066 return true; 4067 } 4068 4069 void Arguments::handle_extra_cms_flags(const char* msg) { 4070 SpecialFlag flag; 4071 const char *flag_name = "UseConcMarkSweepGC"; 4072 if (lookup_special_flag(flag_name, flag)) { 4073 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4074 warning("%s", msg); 4075 } 4076 } 4077 4078 // Parse entry point called from JNI_CreateJavaVM 4079 4080 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4081 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4082 4083 // Initialize ranges, constraints and writeables 4084 CommandLineFlagRangeList::init(); 4085 CommandLineFlagConstraintList::init(); 4086 CommandLineFlagWriteableList::init(); 4087 4088 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4089 const char* hotspotrc = ".hotspotrc"; 4090 bool settings_file_specified = false; 4091 bool needs_hotspotrc_warning = false; 4092 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4093 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4094 4095 // Pointers to current working set of containers 4096 JavaVMInitArgs* cur_cmd_args; 4097 JavaVMInitArgs* cur_java_options_args; 4098 JavaVMInitArgs* cur_java_tool_options_args; 4099 4100 // Containers for modified/expanded options 4101 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4102 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4103 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4104 4105 4106 jint code = 4107 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4108 if (code != JNI_OK) { 4109 return code; 4110 } 4111 4112 code = parse_java_options_environment_variable(&initial_java_options_args); 4113 if (code != JNI_OK) { 4114 return code; 4115 } 4116 4117 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4118 &mod_java_tool_options_args, 4119 &cur_java_tool_options_args); 4120 if (code != JNI_OK) { 4121 return code; 4122 } 4123 4124 code = expand_vm_options_as_needed(initial_cmd_args, 4125 &mod_cmd_args, 4126 &cur_cmd_args); 4127 if (code != JNI_OK) { 4128 return code; 4129 } 4130 4131 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4132 &mod_java_options_args, 4133 &cur_java_options_args); 4134 if (code != JNI_OK) { 4135 return code; 4136 } 4137 4138 const char* flags_file = Arguments::get_jvm_flags_file(); 4139 settings_file_specified = (flags_file != NULL); 4140 4141 if (IgnoreUnrecognizedVMOptions) { 4142 cur_cmd_args->ignoreUnrecognized = true; 4143 cur_java_tool_options_args->ignoreUnrecognized = true; 4144 cur_java_options_args->ignoreUnrecognized = true; 4145 } 4146 4147 // Parse specified settings file 4148 if (settings_file_specified) { 4149 if (!process_settings_file(flags_file, true, 4150 cur_cmd_args->ignoreUnrecognized)) { 4151 return JNI_EINVAL; 4152 } 4153 } else { 4154 #ifdef ASSERT 4155 // Parse default .hotspotrc settings file 4156 if (!process_settings_file(".hotspotrc", false, 4157 cur_cmd_args->ignoreUnrecognized)) { 4158 return JNI_EINVAL; 4159 } 4160 #else 4161 struct stat buf; 4162 if (os::stat(hotspotrc, &buf) == 0) { 4163 needs_hotspotrc_warning = true; 4164 } 4165 #endif 4166 } 4167 4168 if (PrintVMOptions) { 4169 print_options(cur_java_tool_options_args); 4170 print_options(cur_cmd_args); 4171 print_options(cur_java_options_args); 4172 } 4173 4174 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4175 jint result = parse_vm_init_args(cur_java_tool_options_args, 4176 cur_java_options_args, 4177 cur_cmd_args); 4178 4179 if (result != JNI_OK) { 4180 return result; 4181 } 4182 4183 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4184 SharedArchivePath = get_shared_archive_path(); 4185 if (SharedArchivePath == NULL) { 4186 return JNI_ENOMEM; 4187 } 4188 4189 // Set up VerifySharedSpaces 4190 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4191 VerifySharedSpaces = true; 4192 } 4193 4194 // Delay warning until here so that we've had a chance to process 4195 // the -XX:-PrintWarnings flag 4196 if (needs_hotspotrc_warning) { 4197 warning("%s file is present but has been ignored. " 4198 "Run with -XX:Flags=%s to load the file.", 4199 hotspotrc, hotspotrc); 4200 } 4201 4202 if (needs_module_property_warning) { 4203 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4204 " names that are reserved for internal use."); 4205 } 4206 4207 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4208 UNSUPPORTED_OPTION(UseLargePages); 4209 #endif 4210 4211 ArgumentsExt::report_unsupported_options(); 4212 4213 #ifndef PRODUCT 4214 if (TraceBytecodesAt != 0) { 4215 TraceBytecodes = true; 4216 } 4217 if (CountCompiledCalls) { 4218 if (UseCounterDecay) { 4219 warning("UseCounterDecay disabled because CountCalls is set"); 4220 UseCounterDecay = false; 4221 } 4222 } 4223 #endif // PRODUCT 4224 4225 if (ScavengeRootsInCode == 0) { 4226 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4227 warning("Forcing ScavengeRootsInCode non-zero"); 4228 } 4229 ScavengeRootsInCode = 1; 4230 } 4231 4232 if (!handle_deprecated_print_gc_flags()) { 4233 return JNI_EINVAL; 4234 } 4235 4236 // Set object alignment values. 4237 set_object_alignment(); 4238 4239 #if !INCLUDE_CDS 4240 if (DumpSharedSpaces || RequireSharedSpaces) { 4241 jio_fprintf(defaultStream::error_stream(), 4242 "Shared spaces are not supported in this VM\n"); 4243 return JNI_ERR; 4244 } 4245 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 4246 log_is_enabled(Info, cds)) { 4247 warning("Shared spaces are not supported in this VM"); 4248 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4249 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4250 } 4251 no_shared_spaces("CDS Disabled"); 4252 #endif // INCLUDE_CDS 4253 4254 return JNI_OK; 4255 } 4256 4257 jint Arguments::apply_ergo() { 4258 // Set flags based on ergonomics. 4259 jint result = set_ergonomics_flags(); 4260 if (result != JNI_OK) return result; 4261 4262 #if INCLUDE_JVMCI 4263 set_jvmci_specific_flags(); 4264 #endif 4265 4266 set_shared_spaces_flags(); 4267 4268 // Check the GC selections again. 4269 if (!check_gc_consistency()) { 4270 return JNI_EINVAL; 4271 } 4272 4273 if (TieredCompilation) { 4274 set_tiered_flags(); 4275 } else { 4276 int max_compilation_policy_choice = 1; 4277 #ifdef COMPILER2 4278 if (is_server_compilation_mode_vm()) { 4279 max_compilation_policy_choice = 2; 4280 } 4281 #endif 4282 // Check if the policy is valid. 4283 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4284 vm_exit_during_initialization( 4285 "Incompatible compilation policy selected", NULL); 4286 } 4287 // Scale CompileThreshold 4288 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4289 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4290 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4291 } 4292 } 4293 4294 #ifdef COMPILER2 4295 #ifndef PRODUCT 4296 if (PrintIdealGraphLevel > 0) { 4297 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4298 } 4299 #endif 4300 #endif 4301 4302 // Set heap size based on available physical memory 4303 set_heap_size(); 4304 4305 ArgumentsExt::set_gc_specific_flags(); 4306 4307 // Initialize Metaspace flags and alignments 4308 Metaspace::ergo_initialize(); 4309 4310 // Set bytecode rewriting flags 4311 set_bytecode_flags(); 4312 4313 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4314 jint code = set_aggressive_opts_flags(); 4315 if (code != JNI_OK) { 4316 return code; 4317 } 4318 4319 // Turn off biased locking for locking debug mode flags, 4320 // which are subtly different from each other but neither works with 4321 // biased locking 4322 if (UseHeavyMonitors 4323 #ifdef COMPILER1 4324 || !UseFastLocking 4325 #endif // COMPILER1 4326 #if INCLUDE_JVMCI 4327 || !JVMCIUseFastLocking 4328 #endif 4329 ) { 4330 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4331 // flag set to true on command line; warn the user that they 4332 // can't enable biased locking here 4333 warning("Biased Locking is not supported with locking debug flags" 4334 "; ignoring UseBiasedLocking flag." ); 4335 } 4336 UseBiasedLocking = false; 4337 } 4338 4339 #ifdef CC_INTERP 4340 // Clear flags not supported on zero. 4341 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4342 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4343 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4344 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4345 #endif // CC_INTERP 4346 4347 #ifdef COMPILER2 4348 if (!EliminateLocks) { 4349 EliminateNestedLocks = false; 4350 } 4351 if (!Inline) { 4352 IncrementalInline = false; 4353 } 4354 #ifndef PRODUCT 4355 if (!IncrementalInline) { 4356 AlwaysIncrementalInline = false; 4357 } 4358 #endif 4359 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4360 // nothing to use the profiling, turn if off 4361 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4362 } 4363 #endif 4364 4365 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4366 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4367 DebugNonSafepoints = true; 4368 } 4369 4370 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4371 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4372 } 4373 4374 if (UseOnStackReplacement && !UseLoopCounter) { 4375 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4376 FLAG_SET_DEFAULT(UseLoopCounter, true); 4377 } 4378 4379 #ifndef PRODUCT 4380 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4381 if (use_vm_log()) { 4382 LogVMOutput = true; 4383 } 4384 } 4385 #endif // PRODUCT 4386 4387 if (PrintCommandLineFlags) { 4388 CommandLineFlags::printSetFlags(tty); 4389 } 4390 4391 // Apply CPU specific policy for the BiasedLocking 4392 if (UseBiasedLocking) { 4393 if (!VM_Version::use_biased_locking() && 4394 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4395 UseBiasedLocking = false; 4396 } 4397 } 4398 #ifdef COMPILER2 4399 if (!UseBiasedLocking || EmitSync != 0) { 4400 UseOptoBiasInlining = false; 4401 } 4402 #endif 4403 4404 // ThreadLocalHandshakesConstraintFunc handles the constraints. 4405 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 4406 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4407 } else { 4408 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4409 } 4410 4411 return JNI_OK; 4412 } 4413 4414 jint Arguments::adjust_after_os() { 4415 if (UseNUMA) { 4416 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4417 FLAG_SET_ERGO(bool, UseNUMA, false); 4418 } else if (UseParallelGC || UseParallelOldGC) { 4419 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4420 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4421 } 4422 } 4423 // UseNUMAInterleaving is set to ON for all collectors and 4424 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4425 // such as the parallel collector for Linux and Solaris will 4426 // interleave old gen and survivor spaces on top of NUMA 4427 // allocation policy for the eden space. 4428 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4429 // all platforms and ParallelGC on Windows will interleave all 4430 // of the heap spaces across NUMA nodes. 4431 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4432 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4433 } 4434 } 4435 return JNI_OK; 4436 } 4437 4438 int Arguments::PropertyList_count(SystemProperty* pl) { 4439 int count = 0; 4440 while(pl != NULL) { 4441 count++; 4442 pl = pl->next(); 4443 } 4444 return count; 4445 } 4446 4447 // Return the number of readable properties. 4448 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4449 int count = 0; 4450 while(pl != NULL) { 4451 if (pl->is_readable()) { 4452 count++; 4453 } 4454 pl = pl->next(); 4455 } 4456 return count; 4457 } 4458 4459 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4460 assert(key != NULL, "just checking"); 4461 SystemProperty* prop; 4462 for (prop = pl; prop != NULL; prop = prop->next()) { 4463 if (strcmp(key, prop->key()) == 0) return prop->value(); 4464 } 4465 return NULL; 4466 } 4467 4468 // Return the value of the requested property provided that it is a readable property. 4469 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4470 assert(key != NULL, "just checking"); 4471 SystemProperty* prop; 4472 // Return the property value if the keys match and the property is not internal or 4473 // it's the special internal property "jdk.boot.class.path.append". 4474 for (prop = pl; prop != NULL; prop = prop->next()) { 4475 if (strcmp(key, prop->key()) == 0) { 4476 if (!prop->internal()) { 4477 return prop->value(); 4478 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4479 return prop->value(); 4480 } else { 4481 // Property is internal and not jdk.boot.class.path.append so return NULL. 4482 return NULL; 4483 } 4484 } 4485 } 4486 return NULL; 4487 } 4488 4489 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4490 int count = 0; 4491 const char* ret_val = NULL; 4492 4493 while(pl != NULL) { 4494 if(count >= index) { 4495 ret_val = pl->key(); 4496 break; 4497 } 4498 count++; 4499 pl = pl->next(); 4500 } 4501 4502 return ret_val; 4503 } 4504 4505 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4506 int count = 0; 4507 char* ret_val = NULL; 4508 4509 while(pl != NULL) { 4510 if(count >= index) { 4511 ret_val = pl->value(); 4512 break; 4513 } 4514 count++; 4515 pl = pl->next(); 4516 } 4517 4518 return ret_val; 4519 } 4520 4521 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4522 SystemProperty* p = *plist; 4523 if (p == NULL) { 4524 *plist = new_p; 4525 } else { 4526 while (p->next() != NULL) { 4527 p = p->next(); 4528 } 4529 p->set_next(new_p); 4530 } 4531 } 4532 4533 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4534 bool writeable, bool internal) { 4535 if (plist == NULL) 4536 return; 4537 4538 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4539 PropertyList_add(plist, new_p); 4540 } 4541 4542 void Arguments::PropertyList_add(SystemProperty *element) { 4543 PropertyList_add(&_system_properties, element); 4544 } 4545 4546 // This add maintains unique property key in the list. 4547 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4548 PropertyAppendable append, PropertyWriteable writeable, 4549 PropertyInternal internal) { 4550 if (plist == NULL) 4551 return; 4552 4553 // If property key exist then update with new value. 4554 SystemProperty* prop; 4555 for (prop = *plist; prop != NULL; prop = prop->next()) { 4556 if (strcmp(k, prop->key()) == 0) { 4557 if (append == AppendProperty) { 4558 prop->append_value(v); 4559 } else { 4560 prop->set_value(v); 4561 } 4562 return; 4563 } 4564 } 4565 4566 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4567 } 4568 4569 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4570 // Returns true if all of the source pointed by src has been copied over to 4571 // the destination buffer pointed by buf. Otherwise, returns false. 4572 // Notes: 4573 // 1. If the length (buflen) of the destination buffer excluding the 4574 // NULL terminator character is not long enough for holding the expanded 4575 // pid characters, it also returns false instead of returning the partially 4576 // expanded one. 4577 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4578 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4579 char* buf, size_t buflen) { 4580 const char* p = src; 4581 char* b = buf; 4582 const char* src_end = &src[srclen]; 4583 char* buf_end = &buf[buflen - 1]; 4584 4585 while (p < src_end && b < buf_end) { 4586 if (*p == '%') { 4587 switch (*(++p)) { 4588 case '%': // "%%" ==> "%" 4589 *b++ = *p++; 4590 break; 4591 case 'p': { // "%p" ==> current process id 4592 // buf_end points to the character before the last character so 4593 // that we could write '\0' to the end of the buffer. 4594 size_t buf_sz = buf_end - b + 1; 4595 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4596 4597 // if jio_snprintf fails or the buffer is not long enough to hold 4598 // the expanded pid, returns false. 4599 if (ret < 0 || ret >= (int)buf_sz) { 4600 return false; 4601 } else { 4602 b += ret; 4603 assert(*b == '\0', "fail in copy_expand_pid"); 4604 if (p == src_end && b == buf_end + 1) { 4605 // reach the end of the buffer. 4606 return true; 4607 } 4608 } 4609 p++; 4610 break; 4611 } 4612 default : 4613 *b++ = '%'; 4614 } 4615 } else { 4616 *b++ = *p++; 4617 } 4618 } 4619 *b = '\0'; 4620 return (p == src_end); // return false if not all of the source was copied 4621 }