1 /* 2 * Copyright (c) 1997, 2018, 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/collectorPolicy.hpp" 33 #include "gc/shared/gcArguments.hpp" 34 #include "gc/shared/gcConfig.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/arguments_ext.hpp" 45 #include "runtime/flags/jvmFlag.hpp" 46 #include "runtime/flags/jvmFlagConstraintList.hpp" 47 #include "runtime/flags/jvmFlagWriteableList.hpp" 48 #include "runtime/flags/jvmFlagRangeList.hpp" 49 #include "runtime/globals_extension.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.inline.hpp" 52 #include "runtime/safepoint.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 #if INCLUDE_JFR 65 #include "jfr/jfr.hpp" 66 #endif 67 68 // Note: This is a special bug reporting site for the JVM 69 #ifdef VENDOR_URL_VM_BUG 70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 71 #else 72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 73 #endif 74 #define DEFAULT_JAVA_LAUNCHER "generic" 75 76 char* Arguments::_jvm_flags_file = NULL; 77 char** Arguments::_jvm_flags_array = NULL; 78 int Arguments::_num_jvm_flags = 0; 79 char** Arguments::_jvm_args_array = NULL; 80 int Arguments::_num_jvm_args = 0; 81 char* Arguments::_java_command = NULL; 82 SystemProperty* Arguments::_system_properties = NULL; 83 const char* Arguments::_gc_log_filename = NULL; 84 size_t Arguments::_conservative_max_heap_alignment = 0; 85 size_t Arguments::_min_heap_size = 0; 86 Arguments::Mode Arguments::_mode = _mixed; 87 bool Arguments::_java_compiler = false; 88 bool Arguments::_xdebug_mode = false; 89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 91 int Arguments::_sun_java_launcher_pid = -1; 92 bool Arguments::_sun_java_launcher_is_altjvm = false; 93 94 // These parameters are reset in method parse_vm_init_args() 95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 97 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 98 bool Arguments::_ClipInlining = ClipInlining; 99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 101 102 bool Arguments::_enable_preview = false; 103 104 char* Arguments::SharedArchivePath = NULL; 105 106 AgentLibraryList Arguments::_libraryList; 107 AgentLibraryList Arguments::_agentList; 108 109 // These are not set by the JDK's built-in launchers, but they can be set by 110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 111 // JavaVMOption in jni.h. 112 abort_hook_t Arguments::_abort_hook = NULL; 113 exit_hook_t Arguments::_exit_hook = NULL; 114 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 115 116 117 SystemProperty *Arguments::_sun_boot_library_path = NULL; 118 SystemProperty *Arguments::_java_library_path = NULL; 119 SystemProperty *Arguments::_java_home = NULL; 120 SystemProperty *Arguments::_java_class_path = NULL; 121 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 122 SystemProperty *Arguments::_vm_info = NULL; 123 124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 125 PathString *Arguments::_system_boot_class_path = NULL; 126 bool Arguments::_has_jimage = false; 127 128 char* Arguments::_ext_dirs = NULL; 129 130 bool PathString::set_value(const char *value) { 131 if (_value != NULL) { 132 FreeHeap(_value); 133 } 134 _value = AllocateHeap(strlen(value)+1, mtArguments); 135 assert(_value != NULL, "Unable to allocate space for new path value"); 136 if (_value != NULL) { 137 strcpy(_value, value); 138 } else { 139 // not able to allocate 140 return false; 141 } 142 return true; 143 } 144 145 void PathString::append_value(const char *value) { 146 char *sp; 147 size_t len = 0; 148 if (value != NULL) { 149 len = strlen(value); 150 if (_value != NULL) { 151 len += strlen(_value); 152 } 153 sp = AllocateHeap(len+2, mtArguments); 154 assert(sp != NULL, "Unable to allocate space for new append path value"); 155 if (sp != NULL) { 156 if (_value != NULL) { 157 strcpy(sp, _value); 158 strcat(sp, os::path_separator()); 159 strcat(sp, value); 160 FreeHeap(_value); 161 } else { 162 strcpy(sp, value); 163 } 164 _value = sp; 165 } 166 } 167 } 168 169 PathString::PathString(const char* value) { 170 if (value == NULL) { 171 _value = NULL; 172 } else { 173 _value = AllocateHeap(strlen(value)+1, mtArguments); 174 strcpy(_value, value); 175 } 176 } 177 178 PathString::~PathString() { 179 if (_value != NULL) { 180 FreeHeap(_value); 181 _value = NULL; 182 } 183 } 184 185 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 186 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 187 size_t len = strlen(module_name) + 1; 188 _module_name = AllocateHeap(len, mtInternal); 189 strncpy(_module_name, module_name, len); // copy the trailing null 190 _path = new PathString(path); 191 } 192 193 ModulePatchPath::~ModulePatchPath() { 194 if (_module_name != NULL) { 195 FreeHeap(_module_name); 196 _module_name = NULL; 197 } 198 if (_path != NULL) { 199 delete _path; 200 _path = NULL; 201 } 202 } 203 204 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 205 if (key == NULL) { 206 _key = NULL; 207 } else { 208 _key = AllocateHeap(strlen(key)+1, mtArguments); 209 strcpy(_key, key); 210 } 211 _next = NULL; 212 _internal = internal; 213 _writeable = writeable; 214 } 215 216 AgentLibrary::AgentLibrary(const char* name, const char* options, 217 bool is_absolute_path, void* os_lib, 218 bool instrument_lib) { 219 _name = AllocateHeap(strlen(name)+1, mtArguments); 220 strcpy(_name, name); 221 if (options == NULL) { 222 _options = NULL; 223 } else { 224 _options = AllocateHeap(strlen(options)+1, mtArguments); 225 strcpy(_options, options); 226 } 227 _is_absolute_path = is_absolute_path; 228 _os_lib = os_lib; 229 _next = NULL; 230 _state = agent_invalid; 231 _is_static_lib = false; 232 _is_instrument_lib = instrument_lib; 233 } 234 235 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 236 // part of the option string. 237 static bool match_option(const JavaVMOption *option, const char* name, 238 const char** tail) { 239 size_t len = strlen(name); 240 if (strncmp(option->optionString, name, len) == 0) { 241 *tail = option->optionString + len; 242 return true; 243 } else { 244 return false; 245 } 246 } 247 248 // Check if 'option' matches 'name'. No "tail" is allowed. 249 static bool match_option(const JavaVMOption *option, const char* name) { 250 const char* tail = NULL; 251 bool result = match_option(option, name, &tail); 252 if (tail != NULL && *tail == '\0') { 253 return result; 254 } else { 255 return false; 256 } 257 } 258 259 // Return true if any of the strings in null-terminated array 'names' matches. 260 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 261 // the option must match exactly. 262 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 263 bool tail_allowed) { 264 for (/* empty */; *names != NULL; ++names) { 265 if (match_option(option, *names, tail)) { 266 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 267 return true; 268 } 269 } 270 } 271 return false; 272 } 273 274 #if INCLUDE_JFR 275 // return true on failure 276 static bool match_jfr_option(const JavaVMOption** option) { 277 assert((*option)->optionString != NULL, "invariant"); 278 char* tail = NULL; 279 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 280 return Jfr::on_start_flight_recording_option(option, tail); 281 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 282 return Jfr::on_flight_recorder_option(option, tail); 283 } 284 return false; 285 } 286 #endif 287 288 static void logOption(const char* opt) { 289 if (PrintVMOptions) { 290 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 291 } 292 } 293 294 bool needs_module_property_warning = false; 295 296 #define MODULE_PROPERTY_PREFIX "jdk.module." 297 #define MODULE_PROPERTY_PREFIX_LEN 11 298 #define ADDEXPORTS "addexports" 299 #define ADDEXPORTS_LEN 10 300 #define ADDREADS "addreads" 301 #define ADDREADS_LEN 8 302 #define ADDOPENS "addopens" 303 #define ADDOPENS_LEN 8 304 #define PATCH "patch" 305 #define PATCH_LEN 5 306 #define ADDMODS "addmods" 307 #define ADDMODS_LEN 7 308 #define LIMITMODS "limitmods" 309 #define LIMITMODS_LEN 9 310 #define PATH "path" 311 #define PATH_LEN 4 312 #define UPGRADE_PATH "upgrade.path" 313 #define UPGRADE_PATH_LEN 12 314 315 void Arguments::add_init_library(const char* name, char* options) { 316 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 317 } 318 319 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 320 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 321 } 322 323 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 324 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 325 } 326 327 // Late-binding agents not started via arguments 328 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 329 _agentList.add(agentLib); 330 } 331 332 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) { 333 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib)); 334 } 335 336 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 337 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 338 return ((strncmp(option, property, len) == 0) && 339 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 340 } 341 342 // Return true if property starts with "jdk.module." and its ensuing chars match 343 // any of the reserved module properties. 344 // property should be passed without the leading "-D". 345 bool Arguments::is_internal_module_property(const char* property) { 346 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 347 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 348 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 349 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 350 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 351 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 352 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 353 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 354 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 355 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 356 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 357 return true; 358 } 359 } 360 return false; 361 } 362 363 // Process java launcher properties. 364 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 365 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 366 // sun.java.launcher.pid is defined. 367 // Must do this before setting up other system properties, 368 // as some of them may depend on launcher type. 369 for (int index = 0; index < args->nOptions; index++) { 370 const JavaVMOption* option = args->options + index; 371 const char* tail; 372 373 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 374 process_java_launcher_argument(tail, option->extraInfo); 375 continue; 376 } 377 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 378 if (strcmp(tail, "true") == 0) { 379 _sun_java_launcher_is_altjvm = true; 380 } 381 continue; 382 } 383 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 384 _sun_java_launcher_pid = atoi(tail); 385 continue; 386 } 387 } 388 } 389 390 // Initialize system properties key and value. 391 void Arguments::init_system_properties() { 392 393 // Set up _system_boot_class_path which is not a property but 394 // relies heavily on argument processing and the jdk.boot.class.path.append 395 // property. It is used to store the underlying system boot class path. 396 _system_boot_class_path = new PathString(NULL); 397 398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 399 "Java Virtual Machine Specification", false)); 400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 402 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 403 404 // Initialize the vm.info now, but it will need updating after argument parsing. 405 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 406 407 // Following are JVMTI agent writable properties. 408 // Properties values are set to NULL and they are 409 // os specific they are initialized in os::init_system_properties_values(). 410 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 411 _java_library_path = new SystemProperty("java.library.path", NULL, true); 412 _java_home = new SystemProperty("java.home", NULL, true); 413 _java_class_path = new SystemProperty("java.class.path", "", true); 414 // jdk.boot.class.path.append is a non-writeable, internal property. 415 // It can only be set by either: 416 // - -Xbootclasspath/a: 417 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 418 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 419 420 // Add to System Property list. 421 PropertyList_add(&_system_properties, _sun_boot_library_path); 422 PropertyList_add(&_system_properties, _java_library_path); 423 PropertyList_add(&_system_properties, _java_home); 424 PropertyList_add(&_system_properties, _java_class_path); 425 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 426 PropertyList_add(&_system_properties, _vm_info); 427 428 // Set OS specific system properties values 429 os::init_system_properties_values(); 430 } 431 432 // Update/Initialize System properties after JDK version number is known 433 void Arguments::init_version_specific_system_properties() { 434 enum { bufsz = 16 }; 435 char buffer[bufsz]; 436 const char* spec_vendor = "Oracle Corporation"; 437 uint32_t spec_version = JDK_Version::current().major_version(); 438 439 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 440 441 PropertyList_add(&_system_properties, 442 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 443 PropertyList_add(&_system_properties, 444 new SystemProperty("java.vm.specification.version", buffer, false)); 445 PropertyList_add(&_system_properties, 446 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 447 } 448 449 /* 450 * -XX argument processing: 451 * 452 * -XX arguments are defined in several places, such as: 453 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 454 * -XX arguments are parsed in parse_argument(). 455 * -XX argument bounds checking is done in check_vm_args_consistency(). 456 * 457 * Over time -XX arguments may change. There are mechanisms to handle common cases: 458 * 459 * ALIASED: An option that is simply another name for another option. This is often 460 * part of the process of deprecating a flag, but not all aliases need 461 * to be deprecated. 462 * 463 * Create an alias for an option by adding the old and new option names to the 464 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 465 * 466 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 467 * support may be removed in the future. Both regular and aliased options may be 468 * deprecated. 469 * 470 * Add a deprecation warning for an option (or alias) by adding an entry in the 471 * "special_jvm_flags" table and setting the "deprecated_in" field. 472 * Often an option "deprecated" in one major release will 473 * be made "obsolete" in the next. In this case the entry should also have its 474 * "obsolete_in" field set. 475 * 476 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 477 * on the command line. A warning is printed to let the user know that option might not 478 * be accepted in the future. 479 * 480 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 481 * table and setting the "obsolete_in" field. 482 * 483 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 484 * to the current JDK version. The system will flatly refuse to admit the existence of 485 * the flag. This allows a flag to die automatically over JDK releases. 486 * 487 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 488 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 489 * - Newly obsolete or expired deprecated options should have their global variable 490 * definitions removed (from globals.hpp, etc) and related implementations removed. 491 * 492 * Recommended approach for removing options: 493 * 494 * To remove options commonly used by customers (e.g. product -XX options), use 495 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 496 * 497 * To remove internal options (e.g. diagnostic, experimental, develop options), use 498 * a 2-step model adding major release numbers to the obsolete and expire columns. 499 * 500 * To change the name of an option, use the alias table as well as a 2-step 501 * model adding major release numbers to the deprecate and expire columns. 502 * Think twice about aliasing commonly used customer options. 503 * 504 * There are times when it is appropriate to leave a future release number as undefined. 505 * 506 * Tests: Aliases should be tested in VMAliasOptions.java. 507 * Deprecated options should be tested in VMDeprecatedOptions.java. 508 */ 509 510 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 511 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 512 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 513 // the command-line as usual, but will issue a warning. 514 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 515 // the command-line, while issuing a warning and ignoring the flag value. 516 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 517 // existence of the flag. 518 // 519 // MANUAL CLEANUP ON JDK VERSION UPDATES: 520 // This table ensures that the handling of options will update automatically when the JDK 521 // version is incremented, but the source code needs to be cleanup up manually: 522 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 523 // variable should be removed, as well as users of the variable. 524 // - As "deprecated" options age into "obsolete" options, move the entry into the 525 // "Obsolete Flags" section of the table. 526 // - All expired options should be removed from the table. 527 static SpecialFlag const special_jvm_flags[] = { 528 // -------------- Deprecated Flags -------------- 529 // --- Non-alias flags - sorted by obsolete_in then expired_in: 530 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 531 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 532 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 533 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 534 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 535 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() }, 536 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 537 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 538 539 #if defined(_ALLBSD_SOURCE) 540 { "UseSHM", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 541 { "UseHugeTLBFS", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 542 #endif 543 544 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 545 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 546 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 547 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 548 549 // -------------- Obsolete Flags - sorted by expired_in -------------- 550 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 551 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 552 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 553 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 554 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 555 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 556 { "AssumeMP", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 557 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 558 { "UnlinkSymbolsALot", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 559 { "AllowNonVirtualCalls", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 560 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 561 { "PrintSafepointStatisticsTimeout",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 562 { "PrintSafepointStatisticsCount", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 563 { "TransmitErrorReport", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 564 { "ErrorReportServer", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 565 { "EmitSync", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 566 { "SyncVerbose", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 567 { "SyncFlags", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 568 { "SyncKnobs", JDK_Version::undefined(), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 569 { "MonitorInUseLists", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 570 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 571 572 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 573 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 574 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 575 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 576 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 577 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 578 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 579 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 580 #endif 581 582 { NULL, JDK_Version(0), JDK_Version(0) } 583 }; 584 585 // Flags that are aliases for other flags. 586 typedef struct { 587 const char* alias_name; 588 const char* real_name; 589 } AliasedFlag; 590 591 static AliasedFlag const aliased_jvm_flags[] = { 592 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 593 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 594 { NULL, NULL} 595 }; 596 597 // NOTE: A compatibility request will be necessary for each alias to be removed. 598 static AliasedLoggingFlag const aliased_logging_flags[] = { 599 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 600 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 601 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 602 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 603 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 604 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 605 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 606 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 607 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 608 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 609 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 610 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 611 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 612 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 613 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 614 }; 615 616 #ifndef PRODUCT 617 // These options are removed in jdk9. Remove this code for jdk10. 618 static AliasedFlag const removed_develop_logging_flags[] = { 619 { "TraceClassInitialization", "-Xlog:class+init" }, 620 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 621 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 622 { "TraceItables", "-Xlog:itables=debug" }, 623 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 624 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 625 { "TraceStartupTime", "-Xlog:startuptime" }, 626 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 627 { "PrintVtables", "-Xlog:vtables=debug" }, 628 { "VerboseVerification", "-Xlog:verification" }, 629 { NULL, NULL } 630 }; 631 #endif //PRODUCT 632 633 // Return true if "v" is less than "other", where "other" may be "undefined". 634 static bool version_less_than(JDK_Version v, JDK_Version other) { 635 assert(!v.is_undefined(), "must be defined"); 636 if (!other.is_undefined() && v.compare(other) >= 0) { 637 return false; 638 } else { 639 return true; 640 } 641 } 642 643 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 644 645 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 646 // Allow extensions to have priority 647 if (lookup_special_flag_ext(flag_name, flag)) { 648 return true; 649 } 650 651 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 652 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 653 flag = special_jvm_flags[i]; 654 return true; 655 } 656 } 657 return false; 658 } 659 660 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 661 assert(version != NULL, "Must provide a version buffer"); 662 SpecialFlag flag; 663 if (lookup_special_flag(flag_name, flag)) { 664 if (!flag.obsolete_in.is_undefined()) { 665 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 666 *version = flag.obsolete_in; 667 return true; 668 } 669 } 670 } 671 return false; 672 } 673 674 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 675 assert(version != NULL, "Must provide a version buffer"); 676 SpecialFlag flag; 677 if (lookup_special_flag(flag_name, flag)) { 678 if (!flag.deprecated_in.is_undefined()) { 679 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 680 version_less_than(JDK_Version::current(), flag.expired_in)) { 681 *version = flag.deprecated_in; 682 return 1; 683 } else { 684 return -1; 685 } 686 } 687 } 688 return 0; 689 } 690 691 #ifndef PRODUCT 692 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 693 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 694 const AliasedFlag& flag = removed_develop_logging_flags[i]; 695 if (strcmp(flag.alias_name, name) == 0) { 696 return flag.real_name; 697 } 698 } 699 return NULL; 700 } 701 #endif // PRODUCT 702 703 const char* Arguments::real_flag_name(const char *flag_name) { 704 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 705 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 706 if (strcmp(flag_status.alias_name, flag_name) == 0) { 707 return flag_status.real_name; 708 } 709 } 710 return flag_name; 711 } 712 713 #ifdef ASSERT 714 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 715 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 716 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 717 return true; 718 } 719 } 720 return false; 721 } 722 723 // Verifies the correctness of the entries in the special_jvm_flags table. 724 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 725 // version being earlier than the deprecation version, then a warning is issued 726 // and verification fails - by returning false. If it is detected that the table 727 // is out of date, with respect to the current version, then a warning is issued 728 // but verification does not fail. This allows the VM to operate when the version 729 // is first updated, without needing to update all the impacted flags at the 730 // same time. 731 static bool verify_special_jvm_flags() { 732 bool success = true; 733 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 734 const SpecialFlag& flag = special_jvm_flags[i]; 735 if (lookup_special_flag(flag.name, i)) { 736 warning("Duplicate special flag declaration \"%s\"", flag.name); 737 success = false; 738 } 739 if (flag.deprecated_in.is_undefined() && 740 flag.obsolete_in.is_undefined()) { 741 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 742 success = false; 743 } 744 745 if (!flag.deprecated_in.is_undefined()) { 746 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 747 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 748 success = false; 749 } 750 751 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 752 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 753 success = false; 754 } 755 } 756 757 if (!flag.obsolete_in.is_undefined()) { 758 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 759 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 760 success = false; 761 } 762 763 // if flag has become obsolete it should not have a "globals" flag defined anymore. 764 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 765 if (JVMFlag::find_flag(flag.name) != NULL) { 766 // Temporarily disable the warning: 8196739 767 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 768 } 769 } 770 } 771 772 if (!flag.expired_in.is_undefined()) { 773 // if flag has become expired it should not have a "globals" flag defined anymore. 774 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 775 if (JVMFlag::find_flag(flag.name) != NULL) { 776 // Temporarily disable the warning: 8196739 777 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 778 } 779 } 780 } 781 782 } 783 return success; 784 } 785 #endif 786 787 // Parses a size specification string. 788 bool Arguments::atojulong(const char *s, julong* result) { 789 julong n = 0; 790 791 // First char must be a digit. Don't allow negative numbers or leading spaces. 792 if (!isdigit(*s)) { 793 return false; 794 } 795 796 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 797 char* remainder; 798 errno = 0; 799 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 800 if (errno != 0) { 801 return false; 802 } 803 804 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 805 if (remainder == s || strlen(remainder) > 1) { 806 return false; 807 } 808 809 switch (*remainder) { 810 case 'T': case 't': 811 *result = n * G * K; 812 // Check for overflow. 813 if (*result/((julong)G * K) != n) return false; 814 return true; 815 case 'G': case 'g': 816 *result = n * G; 817 if (*result/G != n) return false; 818 return true; 819 case 'M': case 'm': 820 *result = n * M; 821 if (*result/M != n) return false; 822 return true; 823 case 'K': case 'k': 824 *result = n * K; 825 if (*result/K != n) return false; 826 return true; 827 case '\0': 828 *result = n; 829 return true; 830 default: 831 return false; 832 } 833 } 834 835 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 836 if (size < min_size) return arg_too_small; 837 if (size > max_size) return arg_too_big; 838 return arg_in_range; 839 } 840 841 // Describe an argument out of range error 842 void Arguments::describe_range_error(ArgsRange errcode) { 843 switch(errcode) { 844 case arg_too_big: 845 jio_fprintf(defaultStream::error_stream(), 846 "The specified size exceeds the maximum " 847 "representable size.\n"); 848 break; 849 case arg_too_small: 850 case arg_unreadable: 851 case arg_in_range: 852 // do nothing for now 853 break; 854 default: 855 ShouldNotReachHere(); 856 } 857 } 858 859 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) { 860 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) { 861 return true; 862 } else { 863 return false; 864 } 865 } 866 867 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) { 868 char* end; 869 errno = 0; 870 double v = strtod(value, &end); 871 if ((errno != 0) || (*end != 0)) { 872 return false; 873 } 874 875 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) { 876 return true; 877 } 878 return false; 879 } 880 881 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) { 882 julong v; 883 int int_v; 884 intx intx_v; 885 bool is_neg = false; 886 JVMFlag* result = JVMFlag::find_flag(name, strlen(name)); 887 888 if (result == NULL) { 889 return false; 890 } 891 892 // Check the sign first since atojulong() parses only unsigned values. 893 if (*value == '-') { 894 if (!result->is_intx() && !result->is_int()) { 895 return false; 896 } 897 value++; 898 is_neg = true; 899 } 900 if (!Arguments::atojulong(value, &v)) { 901 return false; 902 } 903 if (result->is_int()) { 904 int_v = (int) v; 905 if (is_neg) { 906 int_v = -int_v; 907 } 908 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS; 909 } else if (result->is_uint()) { 910 uint uint_v = (uint) v; 911 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS; 912 } else if (result->is_intx()) { 913 intx_v = (intx) v; 914 if (is_neg) { 915 intx_v = -intx_v; 916 } 917 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS; 918 } else if (result->is_uintx()) { 919 uintx uintx_v = (uintx) v; 920 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS; 921 } else if (result->is_uint64_t()) { 922 uint64_t uint64_t_v = (uint64_t) v; 923 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS; 924 } else if (result->is_size_t()) { 925 size_t size_t_v = (size_t) v; 926 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS; 927 } else if (result->is_double()) { 928 double double_v = (double) v; 929 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS; 930 } else { 931 return false; 932 } 933 } 934 935 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) { 936 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false; 937 // Contract: JVMFlag always returns a pointer that needs freeing. 938 FREE_C_HEAP_ARRAY(char, value); 939 return true; 940 } 941 942 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) { 943 const char* old_value = ""; 944 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false; 945 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 946 size_t new_len = strlen(new_value); 947 const char* value; 948 char* free_this_too = NULL; 949 if (old_len == 0) { 950 value = new_value; 951 } else if (new_len == 0) { 952 value = old_value; 953 } else { 954 size_t length = old_len + 1 + new_len + 1; 955 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 956 // each new setting adds another LINE to the switch: 957 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 958 value = buf; 959 free_this_too = buf; 960 } 961 (void) JVMFlag::ccstrAtPut(name, &value, origin); 962 // JVMFlag always returns a pointer that needs freeing. 963 FREE_C_HEAP_ARRAY(char, value); 964 if (free_this_too != NULL) { 965 // JVMFlag made its own copy, so I must delete my own temp. buffer. 966 FREE_C_HEAP_ARRAY(char, free_this_too); 967 } 968 return true; 969 } 970 971 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 972 const char* real_name = real_flag_name(arg); 973 JDK_Version since = JDK_Version(); 974 switch (is_deprecated_flag(arg, &since)) { 975 case -1: 976 return NULL; // obsolete or expired, don't process normally 977 case 0: 978 return real_name; 979 case 1: { 980 if (warn) { 981 char version[256]; 982 since.to_string(version, sizeof(version)); 983 if (real_name != arg) { 984 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 985 arg, version, real_name); 986 } else { 987 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 988 arg, version); 989 } 990 } 991 return real_name; 992 } 993 } 994 ShouldNotReachHere(); 995 return NULL; 996 } 997 998 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 999 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 1000 // Set tagset string buffer at max size of 256, large enough for any alias tagset 1001 const int max_tagset_size = 256; 1002 int max_tagset_len = max_tagset_size - 1; 1003 char tagset_buffer[max_tagset_size]; 1004 tagset_buffer[0] = '\0'; 1005 1006 // Write tag-set for aliased logging option, in string list form 1007 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 1008 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 1009 if (i > 0) { 1010 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 1011 } 1012 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 1013 } 1014 if (!alf.exactMatch) { 1015 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 1016 } 1017 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 1018 (on) ? "+" : "-", 1019 name, 1020 tagset_buffer, 1021 (on) ? LogLevel::name(alf.level) : "off"); 1022 } 1023 1024 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 1025 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1026 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1027 if (strcmp(alf.alias_name, name) == 0) { 1028 log_deprecated_flag(name, on, alf); 1029 return alf; 1030 } 1031 } 1032 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1033 return a; 1034 } 1035 1036 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1037 1038 // range of acceptable characters spelled out for portability reasons 1039 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1040 #define BUFLEN 255 1041 char name[BUFLEN+1]; 1042 char dummy; 1043 const char* real_name; 1044 bool warn_if_deprecated = true; 1045 1046 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1047 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1048 if (alf.alias_name != NULL){ 1049 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1050 return true; 1051 } 1052 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1053 if (real_name == NULL) { 1054 return false; 1055 } 1056 return set_bool_flag(real_name, false, origin); 1057 } 1058 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1059 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1060 if (alf.alias_name != NULL){ 1061 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1062 return true; 1063 } 1064 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1065 if (real_name == NULL) { 1066 return false; 1067 } 1068 return set_bool_flag(real_name, true, origin); 1069 } 1070 1071 char punct; 1072 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1073 const char* value = strchr(arg, '=') + 1; 1074 JVMFlag* flag; 1075 1076 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1077 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1078 if (alf.alias_name != NULL) { 1079 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1080 return true; 1081 } 1082 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1083 if (real_name == NULL) { 1084 return false; 1085 } 1086 flag = JVMFlag::find_flag(real_name); 1087 if (flag != NULL && flag->is_ccstr()) { 1088 if (flag->ccstr_accumulates()) { 1089 return append_to_string_flag(real_name, value, origin); 1090 } else { 1091 if (value[0] == '\0') { 1092 value = NULL; 1093 } 1094 return set_string_flag(real_name, value, origin); 1095 } 1096 } else { 1097 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1098 } 1099 } 1100 1101 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1102 const char* value = strchr(arg, '=') + 1; 1103 // -XX:Foo:=xxx will reset the string flag to the given value. 1104 if (value[0] == '\0') { 1105 value = NULL; 1106 } 1107 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1108 if (real_name == NULL) { 1109 return false; 1110 } 1111 return set_string_flag(real_name, value, origin); 1112 } 1113 1114 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1115 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1116 #define NUMBER_RANGE "[0123456789eE+-]" 1117 char value[BUFLEN + 1]; 1118 char value2[BUFLEN + 1]; 1119 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1120 // Looks like a floating-point number -- try again with more lenient format string 1121 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1122 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1123 if (real_name == NULL) { 1124 return false; 1125 } 1126 return set_fp_numeric_flag(real_name, value, origin); 1127 } 1128 } 1129 1130 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1131 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1132 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1133 if (real_name == NULL) { 1134 return false; 1135 } 1136 return set_numeric_flag(real_name, value, origin); 1137 } 1138 1139 return false; 1140 } 1141 1142 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1143 assert(bldarray != NULL, "illegal argument"); 1144 1145 if (arg == NULL) { 1146 return; 1147 } 1148 1149 int new_count = *count + 1; 1150 1151 // expand the array and add arg to the last element 1152 if (*bldarray == NULL) { 1153 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1154 } else { 1155 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1156 } 1157 (*bldarray)[*count] = os::strdup_check_oom(arg); 1158 *count = new_count; 1159 } 1160 1161 void Arguments::build_jvm_args(const char* arg) { 1162 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1163 } 1164 1165 void Arguments::build_jvm_flags(const char* arg) { 1166 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1167 } 1168 1169 // utility function to return a string that concatenates all 1170 // strings in a given char** array 1171 const char* Arguments::build_resource_string(char** args, int count) { 1172 if (args == NULL || count == 0) { 1173 return NULL; 1174 } 1175 size_t length = 0; 1176 for (int i = 0; i < count; i++) { 1177 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1178 } 1179 char* s = NEW_RESOURCE_ARRAY(char, length); 1180 char* dst = s; 1181 for (int j = 0; j < count; j++) { 1182 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1183 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1184 dst += offset; 1185 length -= offset; 1186 } 1187 return (const char*) s; 1188 } 1189 1190 void Arguments::print_on(outputStream* st) { 1191 st->print_cr("VM Arguments:"); 1192 if (num_jvm_flags() > 0) { 1193 st->print("jvm_flags: "); print_jvm_flags_on(st); 1194 st->cr(); 1195 } 1196 if (num_jvm_args() > 0) { 1197 st->print("jvm_args: "); print_jvm_args_on(st); 1198 st->cr(); 1199 } 1200 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1201 if (_java_class_path != NULL) { 1202 char* path = _java_class_path->value(); 1203 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1204 } 1205 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1206 } 1207 1208 void Arguments::print_summary_on(outputStream* st) { 1209 // Print the command line. Environment variables that are helpful for 1210 // reproducing the problem are written later in the hs_err file. 1211 // flags are from setting file 1212 if (num_jvm_flags() > 0) { 1213 st->print_raw("Settings File: "); 1214 print_jvm_flags_on(st); 1215 st->cr(); 1216 } 1217 // args are the command line and environment variable arguments. 1218 st->print_raw("Command Line: "); 1219 if (num_jvm_args() > 0) { 1220 print_jvm_args_on(st); 1221 } 1222 // this is the classfile and any arguments to the java program 1223 if (java_command() != NULL) { 1224 st->print("%s", java_command()); 1225 } 1226 st->cr(); 1227 } 1228 1229 void Arguments::print_jvm_flags_on(outputStream* st) { 1230 if (_num_jvm_flags > 0) { 1231 for (int i=0; i < _num_jvm_flags; i++) { 1232 st->print("%s ", _jvm_flags_array[i]); 1233 } 1234 } 1235 } 1236 1237 void Arguments::print_jvm_args_on(outputStream* st) { 1238 if (_num_jvm_args > 0) { 1239 for (int i=0; i < _num_jvm_args; i++) { 1240 st->print("%s ", _jvm_args_array[i]); 1241 } 1242 } 1243 } 1244 1245 bool Arguments::process_argument(const char* arg, 1246 jboolean ignore_unrecognized, 1247 JVMFlag::Flags origin) { 1248 JDK_Version since = JDK_Version(); 1249 1250 if (parse_argument(arg, origin)) { 1251 return true; 1252 } 1253 1254 // Determine if the flag has '+', '-', or '=' characters. 1255 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1256 const char* const argname = has_plus_minus ? arg + 1 : arg; 1257 1258 size_t arg_len; 1259 const char* equal_sign = strchr(argname, '='); 1260 if (equal_sign == NULL) { 1261 arg_len = strlen(argname); 1262 } else { 1263 arg_len = equal_sign - argname; 1264 } 1265 1266 // Only make the obsolete check for valid arguments. 1267 if (arg_len <= BUFLEN) { 1268 // Construct a string which consists only of the argument name without '+', '-', or '='. 1269 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1270 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1271 if (is_obsolete_flag(stripped_argname, &since)) { 1272 char version[256]; 1273 since.to_string(version, sizeof(version)); 1274 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1275 return true; 1276 } 1277 #ifndef PRODUCT 1278 else { 1279 const char* replacement; 1280 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1281 log_warning(arguments)("%s has been removed. Please use %s instead.", 1282 stripped_argname, 1283 replacement); 1284 return false; 1285 } 1286 } 1287 #endif //PRODUCT 1288 } 1289 1290 // For locked flags, report a custom error message if available. 1291 // Otherwise, report the standard unrecognized VM option. 1292 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true); 1293 if (found_flag != NULL) { 1294 char locked_message_buf[BUFLEN]; 1295 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1296 if (strlen(locked_message_buf) == 0) { 1297 if (found_flag->is_bool() && !has_plus_minus) { 1298 jio_fprintf(defaultStream::error_stream(), 1299 "Missing +/- setting for VM option '%s'\n", argname); 1300 } else if (!found_flag->is_bool() && has_plus_minus) { 1301 jio_fprintf(defaultStream::error_stream(), 1302 "Unexpected +/- setting in VM option '%s'\n", argname); 1303 } else { 1304 jio_fprintf(defaultStream::error_stream(), 1305 "Improperly specified VM option '%s'\n", argname); 1306 } 1307 } else { 1308 #ifdef PRODUCT 1309 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1310 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1311 if (ignore_unrecognized && mismatched) { 1312 return true; 1313 } 1314 #endif 1315 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1316 } 1317 } else { 1318 if (ignore_unrecognized) { 1319 return true; 1320 } 1321 jio_fprintf(defaultStream::error_stream(), 1322 "Unrecognized VM option '%s'\n", argname); 1323 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1324 if (fuzzy_matched != NULL) { 1325 jio_fprintf(defaultStream::error_stream(), 1326 "Did you mean '%s%s%s'? ", 1327 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1328 fuzzy_matched->_name, 1329 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1330 } 1331 } 1332 1333 // allow for commandline "commenting out" options like -XX:#+Verbose 1334 return arg[0] == '#'; 1335 } 1336 1337 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1338 FILE* stream = fopen(file_name, "rb"); 1339 if (stream == NULL) { 1340 if (should_exist) { 1341 jio_fprintf(defaultStream::error_stream(), 1342 "Could not open settings file %s\n", file_name); 1343 return false; 1344 } else { 1345 return true; 1346 } 1347 } 1348 1349 char token[1024]; 1350 int pos = 0; 1351 1352 bool in_white_space = true; 1353 bool in_comment = false; 1354 bool in_quote = false; 1355 char quote_c = 0; 1356 bool result = true; 1357 1358 int c = getc(stream); 1359 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1360 if (in_white_space) { 1361 if (in_comment) { 1362 if (c == '\n') in_comment = false; 1363 } else { 1364 if (c == '#') in_comment = true; 1365 else if (!isspace(c)) { 1366 in_white_space = false; 1367 token[pos++] = c; 1368 } 1369 } 1370 } else { 1371 if (c == '\n' || (!in_quote && isspace(c))) { 1372 // token ends at newline, or at unquoted whitespace 1373 // this allows a way to include spaces in string-valued options 1374 token[pos] = '\0'; 1375 logOption(token); 1376 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1377 build_jvm_flags(token); 1378 pos = 0; 1379 in_white_space = true; 1380 in_quote = false; 1381 } else if (!in_quote && (c == '\'' || c == '"')) { 1382 in_quote = true; 1383 quote_c = c; 1384 } else if (in_quote && (c == quote_c)) { 1385 in_quote = false; 1386 } else { 1387 token[pos++] = c; 1388 } 1389 } 1390 c = getc(stream); 1391 } 1392 if (pos > 0) { 1393 token[pos] = '\0'; 1394 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1395 build_jvm_flags(token); 1396 } 1397 fclose(stream); 1398 return result; 1399 } 1400 1401 //============================================================================================================= 1402 // Parsing of properties (-D) 1403 1404 const char* Arguments::get_property(const char* key) { 1405 return PropertyList_get_value(system_properties(), key); 1406 } 1407 1408 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1409 const char* eq = strchr(prop, '='); 1410 const char* key; 1411 const char* value = ""; 1412 1413 if (eq == NULL) { 1414 // property doesn't have a value, thus use passed string 1415 key = prop; 1416 } else { 1417 // property have a value, thus extract it and save to the 1418 // allocated string 1419 size_t key_len = eq - prop; 1420 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1421 1422 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1423 key = tmp_key; 1424 1425 value = &prop[key_len + 1]; 1426 } 1427 1428 if (strcmp(key, "java.compiler") == 0) { 1429 process_java_compiler_argument(value); 1430 // Record value in Arguments, but let it get passed to Java. 1431 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1432 strcmp(key, "sun.java.launcher.pid") == 0) { 1433 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1434 // private and are processed in process_sun_java_launcher_properties(); 1435 // the sun.java.launcher property is passed on to the java application 1436 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1437 // append is true, writable is true, internal is false 1438 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1439 WriteableProperty, ExternalProperty); 1440 } else { 1441 if (strcmp(key, "sun.java.command") == 0) { 1442 char *old_java_command = _java_command; 1443 _java_command = os::strdup_check_oom(value, mtArguments); 1444 if (old_java_command != NULL) { 1445 os::free(old_java_command); 1446 } 1447 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1448 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1449 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1450 // its value without going through the property list or making a Java call. 1451 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1452 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1453 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1454 os::free((void *)old_java_vendor_url_bug); 1455 } 1456 } 1457 1458 // Create new property and add at the end of the list 1459 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1460 } 1461 1462 if (key != prop) { 1463 // SystemProperty copy passed value, thus free previously allocated 1464 // memory 1465 FreeHeap((void *)key); 1466 } 1467 1468 return true; 1469 } 1470 1471 #if INCLUDE_CDS 1472 const char* unsupported_properties[] = { "jdk.module.limitmods", 1473 "jdk.module.upgrade.path", 1474 "jdk.module.patch.0" }; 1475 const char* unsupported_options[] = { "--limit-modules", 1476 "--upgrade-module-path", 1477 "--patch-module" 1478 }; 1479 void Arguments::check_unsupported_dumping_properties() { 1480 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1481 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1482 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1483 SystemProperty* sp = system_properties(); 1484 while (sp != NULL) { 1485 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1486 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1487 vm_exit_during_initialization( 1488 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1489 } 1490 } 1491 sp = sp->next(); 1492 } 1493 1494 // Check for an exploded module build in use with -Xshare:dump. 1495 if (!has_jimage()) { 1496 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1497 } 1498 } 1499 1500 bool Arguments::check_unsupported_cds_runtime_properties() { 1501 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1502 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1503 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1504 if (get_property(unsupported_properties[i]) != NULL) { 1505 if (RequireSharedSpaces) { 1506 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1507 } 1508 return true; 1509 } 1510 } 1511 return false; 1512 } 1513 #endif 1514 1515 //=========================================================================================================== 1516 // Setting int/mixed/comp mode flags 1517 1518 void Arguments::set_mode_flags(Mode mode) { 1519 // Set up default values for all flags. 1520 // If you add a flag to any of the branches below, 1521 // add a default value for it here. 1522 set_java_compiler(false); 1523 _mode = mode; 1524 1525 // Ensure Agent_OnLoad has the correct initial values. 1526 // This may not be the final mode; mode may change later in onload phase. 1527 PropertyList_unique_add(&_system_properties, "java.vm.info", 1528 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1529 1530 UseInterpreter = true; 1531 UseCompiler = true; 1532 UseLoopCounter = true; 1533 1534 // Default values may be platform/compiler dependent - 1535 // use the saved values 1536 ClipInlining = Arguments::_ClipInlining; 1537 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1538 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1539 BackgroundCompilation = Arguments::_BackgroundCompilation; 1540 if (TieredCompilation) { 1541 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1542 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1543 } 1544 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1545 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1546 } 1547 } 1548 1549 // Change from defaults based on mode 1550 switch (mode) { 1551 default: 1552 ShouldNotReachHere(); 1553 break; 1554 case _int: 1555 UseCompiler = false; 1556 UseLoopCounter = false; 1557 AlwaysCompileLoopMethods = false; 1558 UseOnStackReplacement = false; 1559 break; 1560 case _mixed: 1561 // same as default 1562 break; 1563 case _comp: 1564 UseInterpreter = false; 1565 BackgroundCompilation = false; 1566 ClipInlining = false; 1567 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1568 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1569 // compile a level 4 (C2) and then continue executing it. 1570 if (TieredCompilation) { 1571 Tier3InvokeNotifyFreqLog = 0; 1572 Tier4InvocationThreshold = 0; 1573 } 1574 break; 1575 } 1576 } 1577 1578 // Conflict: required to use shared spaces (-Xshare:on), but 1579 // incompatible command line options were chosen. 1580 static void no_shared_spaces(const char* message) { 1581 if (RequireSharedSpaces) { 1582 jio_fprintf(defaultStream::error_stream(), 1583 "Class data sharing is inconsistent with other specified options.\n"); 1584 vm_exit_during_initialization("Unable to use shared archive", message); 1585 } else { 1586 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1587 } 1588 } 1589 1590 void set_object_alignment() { 1591 // Object alignment. 1592 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1593 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1594 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1595 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1596 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1597 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1598 1599 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1600 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1601 1602 // Oop encoding heap max 1603 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1604 1605 if (SurvivorAlignmentInBytes == 0) { 1606 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1607 } 1608 } 1609 1610 size_t Arguments::max_heap_for_compressed_oops() { 1611 // Avoid sign flip. 1612 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1613 // We need to fit both the NULL page and the heap into the memory budget, while 1614 // keeping alignment constraints of the heap. To guarantee the latter, as the 1615 // NULL page is located before the heap, we pad the NULL page to the conservative 1616 // maximum alignment that the GC may ever impose upon the heap. 1617 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1618 _conservative_max_heap_alignment); 1619 1620 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1621 NOT_LP64(ShouldNotReachHere(); return 0); 1622 } 1623 1624 void Arguments::set_use_compressed_oops() { 1625 if (AllocateOldGenAt != NULL) { 1626 FLAG_SET_ERGO(bool, UseCompressedOops, false); 1627 return; 1628 } 1629 #ifndef ZERO 1630 #ifdef _LP64 1631 // MaxHeapSize is not set up properly at this point, but 1632 // the only value that can override MaxHeapSize if we are 1633 // to use UseCompressedOops is InitialHeapSize. 1634 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1635 1636 if (max_heap_size <= max_heap_for_compressed_oops()) { 1637 #if !defined(COMPILER1) || defined(TIERED) 1638 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1639 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1640 } 1641 #endif 1642 } else { 1643 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1644 warning("Max heap size too large for Compressed Oops"); 1645 FLAG_SET_DEFAULT(UseCompressedOops, false); 1646 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1647 } 1648 } 1649 #endif // _LP64 1650 #endif // ZERO 1651 } 1652 1653 1654 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1655 // set_use_compressed_oops(). 1656 void Arguments::set_use_compressed_klass_ptrs() { 1657 #ifndef ZERO 1658 #ifdef _LP64 1659 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1660 if (!UseCompressedOops) { 1661 if (UseCompressedClassPointers) { 1662 warning("UseCompressedClassPointers requires UseCompressedOops"); 1663 } 1664 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1665 } else { 1666 // Turn on UseCompressedClassPointers too 1667 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1668 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1669 } 1670 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1671 if (UseCompressedClassPointers) { 1672 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1673 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1674 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1675 } 1676 } 1677 } 1678 #endif // _LP64 1679 #endif // !ZERO 1680 } 1681 1682 void Arguments::set_conservative_max_heap_alignment() { 1683 // The conservative maximum required alignment for the heap is the maximum of 1684 // the alignments imposed by several sources: any requirements from the heap 1685 // itself, the collector policy and the maximum page size we may run the VM 1686 // with. 1687 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1688 _conservative_max_heap_alignment = MAX4(heap_alignment, 1689 (size_t)os::vm_allocation_granularity(), 1690 os::max_page_size(), 1691 CollectorPolicy::compute_heap_alignment()); 1692 } 1693 1694 jint Arguments::set_ergonomics_flags() { 1695 GCConfig::initialize(); 1696 1697 set_conservative_max_heap_alignment(); 1698 1699 #ifndef ZERO 1700 #ifdef _LP64 1701 set_use_compressed_oops(); 1702 1703 // set_use_compressed_klass_ptrs() must be called after calling 1704 // set_use_compressed_oops(). 1705 set_use_compressed_klass_ptrs(); 1706 1707 // Also checks that certain machines are slower with compressed oops 1708 // in vm_version initialization code. 1709 #endif // _LP64 1710 #endif // !ZERO 1711 1712 return JNI_OK; 1713 } 1714 1715 julong Arguments::limit_by_allocatable_memory(julong limit) { 1716 julong max_allocatable; 1717 julong result = limit; 1718 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1719 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1720 } 1721 return result; 1722 } 1723 1724 // Use static initialization to get the default before parsing 1725 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1726 1727 void Arguments::set_heap_size() { 1728 julong phys_mem = 1729 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1730 : (julong)MaxRAM; 1731 1732 // Convert deprecated flags 1733 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1734 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1735 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1736 1737 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1738 !FLAG_IS_DEFAULT(MinRAMFraction)) 1739 MinRAMPercentage = 100.0 / MinRAMFraction; 1740 1741 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1742 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1743 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1744 1745 // If the maximum heap size has not been set with -Xmx, 1746 // then set it as fraction of the size of physical memory, 1747 // respecting the maximum and minimum sizes of the heap. 1748 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1749 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1750 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1751 if (reasonable_min < MaxHeapSize) { 1752 // Small physical memory, so use a minimum fraction of it for the heap 1753 reasonable_max = reasonable_min; 1754 } else { 1755 // Not-small physical memory, so require a heap at least 1756 // as large as MaxHeapSize 1757 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1758 } 1759 1760 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1761 // Limit the heap size to ErgoHeapSizeLimit 1762 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1763 } 1764 if (UseCompressedOops) { 1765 // Limit the heap size to the maximum possible when using compressed oops 1766 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1767 1768 // HeapBaseMinAddress can be greater than default but not less than. 1769 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1770 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1771 // matches compressed oops printing flags 1772 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1773 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1774 DefaultHeapBaseMinAddress, 1775 DefaultHeapBaseMinAddress/G, 1776 HeapBaseMinAddress); 1777 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1778 } 1779 } 1780 1781 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1782 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1783 // but it should be not less than default MaxHeapSize. 1784 max_coop_heap -= HeapBaseMinAddress; 1785 } 1786 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1787 } 1788 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1789 1790 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1791 // An initial heap size was specified on the command line, 1792 // so be sure that the maximum size is consistent. Done 1793 // after call to limit_by_allocatable_memory because that 1794 // method might reduce the allocation size. 1795 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1796 } 1797 1798 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1799 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1800 } 1801 1802 // If the minimum or initial heap_size have not been set or requested to be set 1803 // ergonomically, set them accordingly. 1804 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1805 julong reasonable_minimum = (julong)(OldSize + NewSize); 1806 1807 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1808 1809 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1810 1811 if (InitialHeapSize == 0) { 1812 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1813 1814 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1815 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1816 1817 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1818 1819 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1820 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1821 } 1822 // If the minimum heap size has not been set (via -Xms), 1823 // synchronize with InitialHeapSize to avoid errors with the default value. 1824 if (min_heap_size() == 0) { 1825 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1826 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1827 } 1828 } 1829 } 1830 1831 // This option inspects the machine and attempts to set various 1832 // parameters to be optimal for long-running, memory allocation 1833 // intensive jobs. It is intended for machines with large 1834 // amounts of cpu and memory. 1835 jint Arguments::set_aggressive_heap_flags() { 1836 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1837 // VM, but we may not be able to represent the total physical memory 1838 // available (like having 8gb of memory on a box but using a 32bit VM). 1839 // Thus, we need to make sure we're using a julong for intermediate 1840 // calculations. 1841 julong initHeapSize; 1842 julong total_memory = os::physical_memory(); 1843 1844 if (total_memory < (julong) 256 * M) { 1845 jio_fprintf(defaultStream::error_stream(), 1846 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1847 vm_exit(1); 1848 } 1849 1850 // The heap size is half of available memory, or (at most) 1851 // all of possible memory less 160mb (leaving room for the OS 1852 // when using ISM). This is the maximum; because adaptive sizing 1853 // is turned on below, the actual space used may be smaller. 1854 1855 initHeapSize = MIN2(total_memory / (julong) 2, 1856 total_memory - (julong) 160 * M); 1857 1858 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1859 1860 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1861 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1862 return JNI_EINVAL; 1863 } 1864 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1865 return JNI_EINVAL; 1866 } 1867 // Currently the minimum size and the initial heap sizes are the same. 1868 set_min_heap_size(initHeapSize); 1869 } 1870 if (FLAG_IS_DEFAULT(NewSize)) { 1871 // Make the young generation 3/8ths of the total heap. 1872 if (FLAG_SET_CMDLINE(size_t, NewSize, 1873 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1874 return JNI_EINVAL; 1875 } 1876 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1877 return JNI_EINVAL; 1878 } 1879 } 1880 1881 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1882 FLAG_SET_DEFAULT(UseLargePages, true); 1883 #endif 1884 1885 // Increase some data structure sizes for efficiency 1886 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1887 return JNI_EINVAL; 1888 } 1889 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) { 1890 return JNI_EINVAL; 1891 } 1892 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1893 return JNI_EINVAL; 1894 } 1895 1896 // See the OldPLABSize comment below, but replace 'after promotion' 1897 // with 'after copying'. YoungPLABSize is the size of the survivor 1898 // space per-gc-thread buffers. The default is 4kw. 1899 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1900 return JNI_EINVAL; 1901 } 1902 1903 // OldPLABSize is the size of the buffers in the old gen that 1904 // UseParallelGC uses to promote live data that doesn't fit in the 1905 // survivor spaces. At any given time, there's one for each gc thread. 1906 // The default size is 1kw. These buffers are rarely used, since the 1907 // survivor spaces are usually big enough. For specjbb, however, there 1908 // are occasions when there's lots of live data in the young gen 1909 // and we end up promoting some of it. We don't have a definite 1910 // explanation for why bumping OldPLABSize helps, but the theory 1911 // is that a bigger PLAB results in retaining something like the 1912 // original allocation order after promotion, which improves mutator 1913 // locality. A minor effect may be that larger PLABs reduce the 1914 // number of PLAB allocation events during gc. The value of 8kw 1915 // was arrived at by experimenting with specjbb. 1916 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1917 return JNI_EINVAL; 1918 } 1919 1920 // Enable parallel GC and adaptive generation sizing 1921 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) { 1922 return JNI_EINVAL; 1923 } 1924 1925 // Encourage steady state memory management 1926 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1927 return JNI_EINVAL; 1928 } 1929 1930 // This appears to improve mutator locality 1931 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1932 return JNI_EINVAL; 1933 } 1934 1935 // Get around early Solaris scheduling bug 1936 // (affinity vs other jobs on system) 1937 // but disallow DR and offlining (5008695). 1938 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) { 1939 return JNI_EINVAL; 1940 } 1941 1942 return JNI_OK; 1943 } 1944 1945 // This must be called after ergonomics. 1946 void Arguments::set_bytecode_flags() { 1947 if (!RewriteBytecodes) { 1948 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1949 } 1950 } 1951 1952 // Aggressive optimization flags 1953 jint Arguments::set_aggressive_opts_flags() { 1954 #ifdef COMPILER2 1955 if (AggressiveUnboxing) { 1956 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1957 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1958 } else if (!EliminateAutoBox) { 1959 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1960 AggressiveUnboxing = false; 1961 } 1962 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1963 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1964 } else if (!DoEscapeAnalysis) { 1965 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1966 AggressiveUnboxing = false; 1967 } 1968 } 1969 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1970 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1971 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1972 } 1973 // Feed the cache size setting into the JDK 1974 char buffer[1024]; 1975 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1976 if (!add_property(buffer)) { 1977 return JNI_ENOMEM; 1978 } 1979 } 1980 #endif 1981 1982 return JNI_OK; 1983 } 1984 1985 //=========================================================================================================== 1986 // Parsing of java.compiler property 1987 1988 void Arguments::process_java_compiler_argument(const char* arg) { 1989 // For backwards compatibility, Djava.compiler=NONE or "" 1990 // causes us to switch to -Xint mode UNLESS -Xdebug 1991 // is also specified. 1992 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1993 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1994 } 1995 } 1996 1997 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1998 _sun_java_launcher = os::strdup_check_oom(launcher); 1999 } 2000 2001 bool Arguments::created_by_java_launcher() { 2002 assert(_sun_java_launcher != NULL, "property must have value"); 2003 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2004 } 2005 2006 bool Arguments::sun_java_launcher_is_altjvm() { 2007 return _sun_java_launcher_is_altjvm; 2008 } 2009 2010 //=========================================================================================================== 2011 // Parsing of main arguments 2012 2013 unsigned int addreads_count = 0; 2014 unsigned int addexports_count = 0; 2015 unsigned int addopens_count = 0; 2016 unsigned int addmods_count = 0; 2017 unsigned int patch_mod_count = 0; 2018 2019 // Check the consistency of vm_init_args 2020 bool Arguments::check_vm_args_consistency() { 2021 // Method for adding checks for flag consistency. 2022 // The intent is to warn the user of all possible conflicts, 2023 // before returning an error. 2024 // Note: Needs platform-dependent factoring. 2025 bool status = true; 2026 2027 if (TLABRefillWasteFraction == 0) { 2028 jio_fprintf(defaultStream::error_stream(), 2029 "TLABRefillWasteFraction should be a denominator, " 2030 "not " SIZE_FORMAT "\n", 2031 TLABRefillWasteFraction); 2032 status = false; 2033 } 2034 2035 if (PrintNMTStatistics) { 2036 #if INCLUDE_NMT 2037 if (MemTracker::tracking_level() == NMT_off) { 2038 #endif // INCLUDE_NMT 2039 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2040 PrintNMTStatistics = false; 2041 #if INCLUDE_NMT 2042 } 2043 #endif 2044 } 2045 2046 status = CompilerConfig::check_args_consistency(status); 2047 #if INCLUDE_JVMCI 2048 if (status && EnableJVMCI) { 2049 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2050 AddProperty, UnwriteableProperty, InternalProperty); 2051 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2052 return false; 2053 } 2054 } 2055 #endif 2056 2057 #ifndef SUPPORT_RESERVED_STACK_AREA 2058 if (StackReservedPages != 0) { 2059 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2060 warning("Reserved Stack Area not supported on this platform"); 2061 } 2062 #endif 2063 2064 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2065 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2066 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2067 } 2068 } 2069 2070 status = status && GCArguments::check_args_consistency(); 2071 2072 return status; 2073 } 2074 2075 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2076 const char* option_type) { 2077 if (ignore) return false; 2078 2079 const char* spacer = " "; 2080 if (option_type == NULL) { 2081 option_type = ++spacer; // Set both to the empty string. 2082 } 2083 2084 jio_fprintf(defaultStream::error_stream(), 2085 "Unrecognized %s%soption: %s\n", option_type, spacer, 2086 option->optionString); 2087 return true; 2088 } 2089 2090 static const char* user_assertion_options[] = { 2091 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2092 }; 2093 2094 static const char* system_assertion_options[] = { 2095 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2096 }; 2097 2098 bool Arguments::parse_uintx(const char* value, 2099 uintx* uintx_arg, 2100 uintx min_size) { 2101 2102 // Check the sign first since atojulong() parses only unsigned values. 2103 bool value_is_positive = !(*value == '-'); 2104 2105 if (value_is_positive) { 2106 julong n; 2107 bool good_return = atojulong(value, &n); 2108 if (good_return) { 2109 bool above_minimum = n >= min_size; 2110 bool value_is_too_large = n > max_uintx; 2111 2112 if (above_minimum && !value_is_too_large) { 2113 *uintx_arg = n; 2114 return true; 2115 } 2116 } 2117 } 2118 return false; 2119 } 2120 2121 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2122 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2123 char* property = AllocateHeap(prop_len, mtArguments); 2124 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2125 if (ret < 0 || ret >= (int)prop_len) { 2126 FreeHeap(property); 2127 return false; 2128 } 2129 bool added = add_property(property, UnwriteableProperty, internal); 2130 FreeHeap(property); 2131 return added; 2132 } 2133 2134 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2135 const unsigned int props_count_limit = 1000; 2136 const int max_digits = 3; 2137 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2138 2139 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2140 if (count < props_count_limit) { 2141 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2142 char* property = AllocateHeap(prop_len, mtArguments); 2143 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2144 if (ret < 0 || ret >= (int)prop_len) { 2145 FreeHeap(property); 2146 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2147 return false; 2148 } 2149 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2150 FreeHeap(property); 2151 return added; 2152 } 2153 2154 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2155 return false; 2156 } 2157 2158 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2159 julong* long_arg, 2160 julong min_size, 2161 julong max_size) { 2162 if (!atojulong(s, long_arg)) return arg_unreadable; 2163 return check_memory_size(*long_arg, min_size, max_size); 2164 } 2165 2166 // Parse JavaVMInitArgs structure 2167 2168 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2169 const JavaVMInitArgs *java_options_args, 2170 const JavaVMInitArgs *cmd_line_args) { 2171 bool patch_mod_javabase = false; 2172 2173 // Save default settings for some mode flags 2174 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2175 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2176 Arguments::_ClipInlining = ClipInlining; 2177 Arguments::_BackgroundCompilation = BackgroundCompilation; 2178 if (TieredCompilation) { 2179 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2180 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2181 } 2182 2183 // Setup flags for mixed which is the default 2184 set_mode_flags(_mixed); 2185 2186 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2187 // variable (if present). 2188 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2189 if (result != JNI_OK) { 2190 return result; 2191 } 2192 2193 // Parse args structure generated from the command line flags. 2194 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2195 if (result != JNI_OK) { 2196 return result; 2197 } 2198 2199 // Parse args structure generated from the _JAVA_OPTIONS environment 2200 // variable (if present) (mimics classic VM) 2201 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2202 if (result != JNI_OK) { 2203 return result; 2204 } 2205 2206 // We need to ensure processor and memory resources have been properly 2207 // configured - which may rely on arguments we just processed - before 2208 // doing the final argument processing. Any argument processing that 2209 // needs to know about processor and memory resources must occur after 2210 // this point. 2211 2212 os::init_container_support(); 2213 2214 // Do final processing now that all arguments have been parsed 2215 result = finalize_vm_init_args(patch_mod_javabase); 2216 if (result != JNI_OK) { 2217 return result; 2218 } 2219 2220 return JNI_OK; 2221 } 2222 2223 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2224 // represents a valid JDWP agent. is_path==true denotes that we 2225 // are dealing with -agentpath (case where name is a path), otherwise with 2226 // -agentlib 2227 bool valid_jdwp_agent(char *name, bool is_path) { 2228 char *_name; 2229 const char *_jdwp = "jdwp"; 2230 size_t _len_jdwp, _len_prefix; 2231 2232 if (is_path) { 2233 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2234 return false; 2235 } 2236 2237 _name++; // skip past last path separator 2238 _len_prefix = strlen(JNI_LIB_PREFIX); 2239 2240 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2241 return false; 2242 } 2243 2244 _name += _len_prefix; 2245 _len_jdwp = strlen(_jdwp); 2246 2247 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2248 _name += _len_jdwp; 2249 } 2250 else { 2251 return false; 2252 } 2253 2254 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2255 return false; 2256 } 2257 2258 return true; 2259 } 2260 2261 if (strcmp(name, _jdwp) == 0) { 2262 return true; 2263 } 2264 2265 return false; 2266 } 2267 2268 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2269 // --patch-module=<module>=<file>(<pathsep><file>)* 2270 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2271 // Find the equal sign between the module name and the path specification 2272 const char* module_equal = strchr(patch_mod_tail, '='); 2273 if (module_equal == NULL) { 2274 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2275 return JNI_ERR; 2276 } else { 2277 // Pick out the module name 2278 size_t module_len = module_equal - patch_mod_tail; 2279 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2280 if (module_name != NULL) { 2281 memcpy(module_name, patch_mod_tail, module_len); 2282 *(module_name + module_len) = '\0'; 2283 // The path piece begins one past the module_equal sign 2284 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2285 FREE_C_HEAP_ARRAY(char, module_name); 2286 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2287 return JNI_ENOMEM; 2288 } 2289 } else { 2290 return JNI_ENOMEM; 2291 } 2292 } 2293 return JNI_OK; 2294 } 2295 2296 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2297 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2298 // The min and max sizes match the values in globals.hpp, but scaled 2299 // with K. The values have been chosen so that alignment with page 2300 // size doesn't change the max value, which makes the conversions 2301 // back and forth between Xss value and ThreadStackSize value easier. 2302 // The values have also been chosen to fit inside a 32-bit signed type. 2303 const julong min_ThreadStackSize = 0; 2304 const julong max_ThreadStackSize = 1 * M; 2305 2306 const julong min_size = min_ThreadStackSize * K; 2307 const julong max_size = max_ThreadStackSize * K; 2308 2309 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2310 2311 julong size = 0; 2312 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2313 if (errcode != arg_in_range) { 2314 bool silent = (option == NULL); // Allow testing to silence error messages 2315 if (!silent) { 2316 jio_fprintf(defaultStream::error_stream(), 2317 "Invalid thread stack size: %s\n", option->optionString); 2318 describe_range_error(errcode); 2319 } 2320 return JNI_EINVAL; 2321 } 2322 2323 // Internally track ThreadStackSize in units of 1024 bytes. 2324 const julong size_aligned = align_up(size, K); 2325 assert(size <= size_aligned, 2326 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2327 size, size_aligned); 2328 2329 const julong size_in_K = size_aligned / K; 2330 assert(size_in_K < (julong)max_intx, 2331 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2332 size_in_K); 2333 2334 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2335 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2336 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2337 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2338 max_expanded, size_in_K); 2339 2340 *out_ThreadStackSize = (intx)size_in_K; 2341 2342 return JNI_OK; 2343 } 2344 2345 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2346 // For match_option to return remaining or value part of option string 2347 const char* tail; 2348 2349 // iterate over arguments 2350 for (int index = 0; index < args->nOptions; index++) { 2351 bool is_absolute_path = false; // for -agentpath vs -agentlib 2352 2353 const JavaVMOption* option = args->options + index; 2354 2355 if (!match_option(option, "-Djava.class.path", &tail) && 2356 !match_option(option, "-Dsun.java.command", &tail) && 2357 !match_option(option, "-Dsun.java.launcher", &tail)) { 2358 2359 // add all jvm options to the jvm_args string. This string 2360 // is used later to set the java.vm.args PerfData string constant. 2361 // the -Djava.class.path and the -Dsun.java.command options are 2362 // omitted from jvm_args string as each have their own PerfData 2363 // string constant object. 2364 build_jvm_args(option->optionString); 2365 } 2366 2367 // -verbose:[class/module/gc/jni] 2368 if (match_option(option, "-verbose", &tail)) { 2369 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2370 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2371 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2372 } else if (!strcmp(tail, ":module")) { 2373 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2374 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2375 } else if (!strcmp(tail, ":gc")) { 2376 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2377 } else if (!strcmp(tail, ":jni")) { 2378 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) { 2379 return JNI_EINVAL; 2380 } 2381 } 2382 // -da / -ea / -disableassertions / -enableassertions 2383 // These accept an optional class/package name separated by a colon, e.g., 2384 // -da:java.lang.Thread. 2385 } else if (match_option(option, user_assertion_options, &tail, true)) { 2386 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2387 if (*tail == '\0') { 2388 JavaAssertions::setUserClassDefault(enable); 2389 } else { 2390 assert(*tail == ':', "bogus match by match_option()"); 2391 JavaAssertions::addOption(tail + 1, enable); 2392 } 2393 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2394 } else if (match_option(option, system_assertion_options, &tail, false)) { 2395 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2396 JavaAssertions::setSystemClassDefault(enable); 2397 // -bootclasspath: 2398 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2399 jio_fprintf(defaultStream::output_stream(), 2400 "-Xbootclasspath is no longer a supported option.\n"); 2401 return JNI_EINVAL; 2402 // -bootclasspath/a: 2403 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2404 Arguments::append_sysclasspath(tail); 2405 // -bootclasspath/p: 2406 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2407 jio_fprintf(defaultStream::output_stream(), 2408 "-Xbootclasspath/p is no longer a supported option.\n"); 2409 return JNI_EINVAL; 2410 // -Xrun 2411 } else if (match_option(option, "-Xrun", &tail)) { 2412 if (tail != NULL) { 2413 const char* pos = strchr(tail, ':'); 2414 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2415 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2416 jio_snprintf(name, len + 1, "%s", tail); 2417 2418 char *options = NULL; 2419 if(pos != NULL) { 2420 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2421 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2422 } 2423 #if !INCLUDE_JVMTI 2424 if (strcmp(name, "jdwp") == 0) { 2425 jio_fprintf(defaultStream::error_stream(), 2426 "Debugging agents are not supported in this VM\n"); 2427 return JNI_ERR; 2428 } 2429 #endif // !INCLUDE_JVMTI 2430 add_init_library(name, options); 2431 } 2432 } else if (match_option(option, "--add-reads=", &tail)) { 2433 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2434 return JNI_ENOMEM; 2435 } 2436 } else if (match_option(option, "--add-exports=", &tail)) { 2437 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2438 return JNI_ENOMEM; 2439 } 2440 } else if (match_option(option, "--add-opens=", &tail)) { 2441 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2442 return JNI_ENOMEM; 2443 } 2444 } else if (match_option(option, "--add-modules=", &tail)) { 2445 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2446 return JNI_ENOMEM; 2447 } 2448 } else if (match_option(option, "--limit-modules=", &tail)) { 2449 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2450 return JNI_ENOMEM; 2451 } 2452 } else if (match_option(option, "--module-path=", &tail)) { 2453 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2454 return JNI_ENOMEM; 2455 } 2456 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2457 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2458 return JNI_ENOMEM; 2459 } 2460 } else if (match_option(option, "--patch-module=", &tail)) { 2461 // --patch-module=<module>=<file>(<pathsep><file>)* 2462 int res = process_patch_mod_option(tail, patch_mod_javabase); 2463 if (res != JNI_OK) { 2464 return res; 2465 } 2466 } else if (match_option(option, "--illegal-access=", &tail)) { 2467 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2468 return JNI_ENOMEM; 2469 } 2470 // -agentlib and -agentpath 2471 } else if (match_option(option, "-agentlib:", &tail) || 2472 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2473 if(tail != NULL) { 2474 const char* pos = strchr(tail, '='); 2475 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2476 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2477 name[len] = '\0'; 2478 2479 char *options = NULL; 2480 if(pos != NULL) { 2481 options = os::strdup_check_oom(pos + 1, mtArguments); 2482 } 2483 #if !INCLUDE_JVMTI 2484 if (valid_jdwp_agent(name, is_absolute_path)) { 2485 jio_fprintf(defaultStream::error_stream(), 2486 "Debugging agents are not supported in this VM\n"); 2487 return JNI_ERR; 2488 } 2489 #endif // !INCLUDE_JVMTI 2490 add_init_agent(name, options, is_absolute_path); 2491 } 2492 // -javaagent 2493 } else if (match_option(option, "-javaagent:", &tail)) { 2494 #if !INCLUDE_JVMTI 2495 jio_fprintf(defaultStream::error_stream(), 2496 "Instrumentation agents are not supported in this VM\n"); 2497 return JNI_ERR; 2498 #else 2499 if (tail != NULL) { 2500 size_t length = strlen(tail) + 1; 2501 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2502 jio_snprintf(options, length, "%s", tail); 2503 add_instrument_agent("instrument", options, false); 2504 // java agents need module java.instrument 2505 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2506 return JNI_ENOMEM; 2507 } 2508 } 2509 #endif // !INCLUDE_JVMTI 2510 // --enable_preview 2511 } else if (match_option(option, "--enable-preview")) { 2512 set_enable_preview(); 2513 // -Xnoclassgc 2514 } else if (match_option(option, "-Xnoclassgc")) { 2515 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) { 2516 return JNI_EINVAL; 2517 } 2518 // -Xconcgc 2519 } else if (match_option(option, "-Xconcgc")) { 2520 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) { 2521 return JNI_EINVAL; 2522 } 2523 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2524 // -Xnoconcgc 2525 } else if (match_option(option, "-Xnoconcgc")) { 2526 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) { 2527 return JNI_EINVAL; 2528 } 2529 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2530 // -Xbatch 2531 } else if (match_option(option, "-Xbatch")) { 2532 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2533 return JNI_EINVAL; 2534 } 2535 // -Xmn for compatibility with other JVM vendors 2536 } else if (match_option(option, "-Xmn", &tail)) { 2537 julong long_initial_young_size = 0; 2538 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2539 if (errcode != arg_in_range) { 2540 jio_fprintf(defaultStream::error_stream(), 2541 "Invalid initial young generation size: %s\n", option->optionString); 2542 describe_range_error(errcode); 2543 return JNI_EINVAL; 2544 } 2545 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2546 return JNI_EINVAL; 2547 } 2548 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2549 return JNI_EINVAL; 2550 } 2551 // -Xms 2552 } else if (match_option(option, "-Xms", &tail)) { 2553 julong long_initial_heap_size = 0; 2554 // an initial heap size of 0 means automatically determine 2555 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2556 if (errcode != arg_in_range) { 2557 jio_fprintf(defaultStream::error_stream(), 2558 "Invalid initial heap size: %s\n", option->optionString); 2559 describe_range_error(errcode); 2560 return JNI_EINVAL; 2561 } 2562 set_min_heap_size((size_t)long_initial_heap_size); 2563 // Currently the minimum size and the initial heap sizes are the same. 2564 // Can be overridden with -XX:InitialHeapSize. 2565 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) { 2566 return JNI_EINVAL; 2567 } 2568 // -Xmx 2569 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2570 julong long_max_heap_size = 0; 2571 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2572 if (errcode != arg_in_range) { 2573 jio_fprintf(defaultStream::error_stream(), 2574 "Invalid maximum heap size: %s\n", option->optionString); 2575 describe_range_error(errcode); 2576 return JNI_EINVAL; 2577 } 2578 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2579 return JNI_EINVAL; 2580 } 2581 // Xmaxf 2582 } else if (match_option(option, "-Xmaxf", &tail)) { 2583 char* err; 2584 int maxf = (int)(strtod(tail, &err) * 100); 2585 if (*err != '\0' || *tail == '\0') { 2586 jio_fprintf(defaultStream::error_stream(), 2587 "Bad max heap free percentage size: %s\n", 2588 option->optionString); 2589 return JNI_EINVAL; 2590 } else { 2591 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2592 return JNI_EINVAL; 2593 } 2594 } 2595 // Xminf 2596 } else if (match_option(option, "-Xminf", &tail)) { 2597 char* err; 2598 int minf = (int)(strtod(tail, &err) * 100); 2599 if (*err != '\0' || *tail == '\0') { 2600 jio_fprintf(defaultStream::error_stream(), 2601 "Bad min heap free percentage size: %s\n", 2602 option->optionString); 2603 return JNI_EINVAL; 2604 } else { 2605 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2606 return JNI_EINVAL; 2607 } 2608 } 2609 // -Xss 2610 } else if (match_option(option, "-Xss", &tail)) { 2611 intx value = 0; 2612 jint err = parse_xss(option, tail, &value); 2613 if (err != JNI_OK) { 2614 return err; 2615 } 2616 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) { 2617 return JNI_EINVAL; 2618 } 2619 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2620 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2621 julong long_ReservedCodeCacheSize = 0; 2622 2623 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2624 if (errcode != arg_in_range) { 2625 jio_fprintf(defaultStream::error_stream(), 2626 "Invalid maximum code cache size: %s.\n", option->optionString); 2627 return JNI_EINVAL; 2628 } 2629 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2630 return JNI_EINVAL; 2631 } 2632 // -green 2633 } else if (match_option(option, "-green")) { 2634 jio_fprintf(defaultStream::error_stream(), 2635 "Green threads support not available\n"); 2636 return JNI_EINVAL; 2637 // -native 2638 } else if (match_option(option, "-native")) { 2639 // HotSpot always uses native threads, ignore silently for compatibility 2640 // -Xrs 2641 } else if (match_option(option, "-Xrs")) { 2642 // Classic/EVM option, new functionality 2643 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2644 return JNI_EINVAL; 2645 } 2646 // -Xprof 2647 } else if (match_option(option, "-Xprof")) { 2648 char version[256]; 2649 // Obsolete in JDK 10 2650 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2651 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2652 // -Xinternalversion 2653 } else if (match_option(option, "-Xinternalversion")) { 2654 jio_fprintf(defaultStream::output_stream(), "%s\n", 2655 VM_Version::internal_vm_info_string()); 2656 vm_exit(0); 2657 #ifndef PRODUCT 2658 // -Xprintflags 2659 } else if (match_option(option, "-Xprintflags")) { 2660 JVMFlag::printFlags(tty, false); 2661 vm_exit(0); 2662 #endif 2663 // -D 2664 } else if (match_option(option, "-D", &tail)) { 2665 const char* value; 2666 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2667 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2668 // abort if -Djava.endorsed.dirs is set 2669 jio_fprintf(defaultStream::output_stream(), 2670 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2671 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2672 return JNI_EINVAL; 2673 } 2674 if (match_option(option, "-Djava.ext.dirs=", &value) && 2675 *value != '\0' && strcmp(value, "\"\"") != 0) { 2676 // abort if -Djava.ext.dirs is set 2677 jio_fprintf(defaultStream::output_stream(), 2678 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2679 return JNI_EINVAL; 2680 } 2681 // Check for module related properties. They must be set using the modules 2682 // options. For example: use "--add-modules=java.sql", not 2683 // "-Djdk.module.addmods=java.sql" 2684 if (is_internal_module_property(option->optionString + 2)) { 2685 needs_module_property_warning = true; 2686 continue; 2687 } 2688 2689 if (!add_property(tail)) { 2690 return JNI_ENOMEM; 2691 } 2692 // Out of the box management support 2693 if (match_option(option, "-Dcom.sun.management", &tail)) { 2694 #if INCLUDE_MANAGEMENT 2695 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) { 2696 return JNI_EINVAL; 2697 } 2698 // management agent in module jdk.management.agent 2699 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2700 return JNI_ENOMEM; 2701 } 2702 #else 2703 jio_fprintf(defaultStream::output_stream(), 2704 "-Dcom.sun.management is not supported in this VM.\n"); 2705 return JNI_ERR; 2706 #endif 2707 } 2708 // -Xint 2709 } else if (match_option(option, "-Xint")) { 2710 set_mode_flags(_int); 2711 // -Xmixed 2712 } else if (match_option(option, "-Xmixed")) { 2713 set_mode_flags(_mixed); 2714 // -Xcomp 2715 } else if (match_option(option, "-Xcomp")) { 2716 // for testing the compiler; turn off all flags that inhibit compilation 2717 set_mode_flags(_comp); 2718 // -Xshare:dump 2719 } else if (match_option(option, "-Xshare:dump")) { 2720 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2721 return JNI_EINVAL; 2722 } 2723 set_mode_flags(_int); // Prevent compilation, which creates objects 2724 // -Xshare:on 2725 } else if (match_option(option, "-Xshare:on")) { 2726 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2727 return JNI_EINVAL; 2728 } 2729 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2730 return JNI_EINVAL; 2731 } 2732 // -Xshare:auto 2733 } else if (match_option(option, "-Xshare:auto")) { 2734 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2735 return JNI_EINVAL; 2736 } 2737 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2738 return JNI_EINVAL; 2739 } 2740 // -Xshare:off 2741 } else if (match_option(option, "-Xshare:off")) { 2742 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2743 return JNI_EINVAL; 2744 } 2745 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2746 return JNI_EINVAL; 2747 } 2748 // -Xverify 2749 } else if (match_option(option, "-Xverify", &tail)) { 2750 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2751 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2752 return JNI_EINVAL; 2753 } 2754 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2755 return JNI_EINVAL; 2756 } 2757 } else if (strcmp(tail, ":remote") == 0) { 2758 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2759 return JNI_EINVAL; 2760 } 2761 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2762 return JNI_EINVAL; 2763 } 2764 } else if (strcmp(tail, ":none") == 0) { 2765 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2766 return JNI_EINVAL; 2767 } 2768 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2769 return JNI_EINVAL; 2770 } 2771 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2772 return JNI_EINVAL; 2773 } 2774 // -Xdebug 2775 } else if (match_option(option, "-Xdebug")) { 2776 // note this flag has been used, then ignore 2777 set_xdebug_mode(true); 2778 // -Xnoagent 2779 } else if (match_option(option, "-Xnoagent")) { 2780 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2781 } else if (match_option(option, "-Xloggc:", &tail)) { 2782 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2783 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2784 _gc_log_filename = os::strdup_check_oom(tail); 2785 } else if (match_option(option, "-Xlog", &tail)) { 2786 bool ret = false; 2787 if (strcmp(tail, ":help") == 0) { 2788 fileStream stream(defaultStream::output_stream()); 2789 LogConfiguration::print_command_line_help(&stream); 2790 vm_exit(0); 2791 } else if (strcmp(tail, ":disable") == 0) { 2792 LogConfiguration::disable_logging(); 2793 ret = true; 2794 } else if (*tail == '\0') { 2795 ret = LogConfiguration::parse_command_line_arguments(); 2796 assert(ret, "-Xlog without arguments should never fail to parse"); 2797 } else if (*tail == ':') { 2798 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2799 } 2800 if (ret == false) { 2801 jio_fprintf(defaultStream::error_stream(), 2802 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2803 tail); 2804 return JNI_EINVAL; 2805 } 2806 // JNI hooks 2807 } else if (match_option(option, "-Xcheck", &tail)) { 2808 if (!strcmp(tail, ":jni")) { 2809 #if !INCLUDE_JNI_CHECK 2810 warning("JNI CHECKING is not supported in this VM"); 2811 #else 2812 CheckJNICalls = true; 2813 #endif // INCLUDE_JNI_CHECK 2814 } else if (is_bad_option(option, args->ignoreUnrecognized, 2815 "check")) { 2816 return JNI_EINVAL; 2817 } 2818 } else if (match_option(option, "vfprintf")) { 2819 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2820 } else if (match_option(option, "exit")) { 2821 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2822 } else if (match_option(option, "abort")) { 2823 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2824 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2825 // and the last option wins. 2826 } else if (match_option(option, "-XX:+NeverTenure")) { 2827 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) { 2828 return JNI_EINVAL; 2829 } 2830 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) { 2831 return JNI_EINVAL; 2832 } 2833 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) { 2834 return JNI_EINVAL; 2835 } 2836 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2837 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2838 return JNI_EINVAL; 2839 } 2840 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) { 2841 return JNI_EINVAL; 2842 } 2843 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2844 return JNI_EINVAL; 2845 } 2846 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2847 uintx max_tenuring_thresh = 0; 2848 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2849 jio_fprintf(defaultStream::error_stream(), 2850 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2851 return JNI_EINVAL; 2852 } 2853 2854 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2855 return JNI_EINVAL; 2856 } 2857 2858 if (MaxTenuringThreshold == 0) { 2859 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2860 return JNI_EINVAL; 2861 } 2862 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) { 2863 return JNI_EINVAL; 2864 } 2865 } else { 2866 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2867 return JNI_EINVAL; 2868 } 2869 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) { 2870 return JNI_EINVAL; 2871 } 2872 } 2873 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2874 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2875 return JNI_EINVAL; 2876 } 2877 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2878 return JNI_EINVAL; 2879 } 2880 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2881 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2882 return JNI_EINVAL; 2883 } 2884 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2885 return JNI_EINVAL; 2886 } 2887 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2888 #if defined(DTRACE_ENABLED) 2889 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 2890 return JNI_EINVAL; 2891 } 2892 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 2893 return JNI_EINVAL; 2894 } 2895 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 2896 return JNI_EINVAL; 2897 } 2898 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 2899 return JNI_EINVAL; 2900 } 2901 #else // defined(DTRACE_ENABLED) 2902 jio_fprintf(defaultStream::error_stream(), 2903 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2904 return JNI_EINVAL; 2905 #endif // defined(DTRACE_ENABLED) 2906 #ifdef ASSERT 2907 } else if (match_option(option, "-XX:+FullGCALot")) { 2908 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) { 2909 return JNI_EINVAL; 2910 } 2911 // disable scavenge before parallel mark-compact 2912 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2913 return JNI_EINVAL; 2914 } 2915 #endif 2916 #if !INCLUDE_MANAGEMENT 2917 } else if (match_option(option, "-XX:+ManagementServer")) { 2918 jio_fprintf(defaultStream::error_stream(), 2919 "ManagementServer is not supported in this VM.\n"); 2920 return JNI_ERR; 2921 #endif // INCLUDE_MANAGEMENT 2922 #if INCLUDE_JFR 2923 } else if (match_jfr_option(&option)) { 2924 return JNI_EINVAL; 2925 #endif 2926 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2927 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2928 // already been handled 2929 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2930 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2931 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2932 return JNI_EINVAL; 2933 } 2934 } 2935 // Unknown option 2936 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2937 return JNI_ERR; 2938 } 2939 } 2940 2941 // PrintSharedArchiveAndExit will turn on 2942 // -Xshare:on 2943 // -Xlog:class+path=info 2944 if (PrintSharedArchiveAndExit) { 2945 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2946 return JNI_EINVAL; 2947 } 2948 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2949 return JNI_EINVAL; 2950 } 2951 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2952 } 2953 2954 // Change the default value for flags which have different default values 2955 // when working with older JDKs. 2956 #ifdef LINUX 2957 if (JDK_Version::current().compare_major(6) <= 0 && 2958 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2959 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2960 } 2961 #endif // LINUX 2962 fix_appclasspath(); 2963 return JNI_OK; 2964 } 2965 2966 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 2967 // For java.base check for duplicate --patch-module options being specified on the command line. 2968 // This check is only required for java.base, all other duplicate module specifications 2969 // will be checked during module system initialization. The module system initialization 2970 // will throw an ExceptionInInitializerError if this situation occurs. 2971 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2972 if (*patch_mod_javabase) { 2973 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2974 } else { 2975 *patch_mod_javabase = true; 2976 } 2977 } 2978 2979 // Create GrowableArray lazily, only if --patch-module has been specified 2980 if (_patch_mod_prefix == NULL) { 2981 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 2982 } 2983 2984 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2985 } 2986 2987 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2988 // 2989 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2990 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2991 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2992 // path is treated as the current directory. 2993 // 2994 // This causes problems with CDS, which requires that all directories specified in the classpath 2995 // must be empty. In most cases, applications do NOT want to load classes from the current 2996 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2997 // scripts compatible with CDS. 2998 void Arguments::fix_appclasspath() { 2999 if (IgnoreEmptyClassPaths) { 3000 const char separator = *os::path_separator(); 3001 const char* src = _java_class_path->value(); 3002 3003 // skip over all the leading empty paths 3004 while (*src == separator) { 3005 src ++; 3006 } 3007 3008 char* copy = os::strdup_check_oom(src, mtArguments); 3009 3010 // trim all trailing empty paths 3011 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3012 *tail = '\0'; 3013 } 3014 3015 char from[3] = {separator, separator, '\0'}; 3016 char to [2] = {separator, '\0'}; 3017 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3018 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3019 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3020 } 3021 3022 _java_class_path->set_writeable_value(copy); 3023 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3024 } 3025 } 3026 3027 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3028 // check if the default lib/endorsed directory exists; if so, error 3029 char path[JVM_MAXPATHLEN]; 3030 const char* fileSep = os::file_separator(); 3031 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3032 3033 DIR* dir = os::opendir(path); 3034 if (dir != NULL) { 3035 jio_fprintf(defaultStream::output_stream(), 3036 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3037 "in modular form will be supported via the concept of upgradeable modules.\n"); 3038 os::closedir(dir); 3039 return JNI_ERR; 3040 } 3041 3042 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3043 dir = os::opendir(path); 3044 if (dir != NULL) { 3045 jio_fprintf(defaultStream::output_stream(), 3046 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3047 "Use -classpath instead.\n."); 3048 os::closedir(dir); 3049 return JNI_ERR; 3050 } 3051 3052 // This must be done after all arguments have been processed 3053 // and the container support has been initialized since AggressiveHeap 3054 // relies on the amount of total memory available. 3055 if (AggressiveHeap) { 3056 jint result = set_aggressive_heap_flags(); 3057 if (result != JNI_OK) { 3058 return result; 3059 } 3060 } 3061 3062 // This must be done after all arguments have been processed. 3063 // java_compiler() true means set to "NONE" or empty. 3064 if (java_compiler() && !xdebug_mode()) { 3065 // For backwards compatibility, we switch to interpreted mode if 3066 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3067 // not specified. 3068 set_mode_flags(_int); 3069 } 3070 3071 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3072 // but like -Xint, leave compilation thresholds unaffected. 3073 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3074 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3075 set_mode_flags(_int); 3076 } 3077 3078 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3079 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3080 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3081 } 3082 3083 #if !COMPILER2_OR_JVMCI 3084 // Don't degrade server performance for footprint 3085 if (FLAG_IS_DEFAULT(UseLargePages) && 3086 MaxHeapSize < LargePageHeapSizeThreshold) { 3087 // No need for large granularity pages w/small heaps. 3088 // Note that large pages are enabled/disabled for both the 3089 // Java heap and the code cache. 3090 FLAG_SET_DEFAULT(UseLargePages, false); 3091 } 3092 3093 UNSUPPORTED_OPTION(ProfileInterpreter); 3094 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3095 #endif 3096 3097 #ifndef TIERED 3098 // Tiered compilation is undefined. 3099 UNSUPPORTED_OPTION(TieredCompilation); 3100 #endif 3101 3102 if (!check_vm_args_consistency()) { 3103 return JNI_ERR; 3104 } 3105 3106 #if INCLUDE_CDS 3107 if (DumpSharedSpaces) { 3108 // Disable biased locking now as it interferes with the clean up of 3109 // the archived Klasses and Java string objects (at dump time only). 3110 UseBiasedLocking = false; 3111 3112 // Always verify non-system classes during CDS dump 3113 if (!BytecodeVerificationRemote) { 3114 BytecodeVerificationRemote = true; 3115 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3116 } 3117 } 3118 if (UseSharedSpaces && patch_mod_javabase) { 3119 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3120 } 3121 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3122 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3123 } 3124 #endif 3125 3126 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3127 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3128 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3129 3130 return JNI_OK; 3131 } 3132 3133 // Helper class for controlling the lifetime of JavaVMInitArgs 3134 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3135 // deleted on the destruction of the ScopedVMInitArgs object. 3136 class ScopedVMInitArgs : public StackObj { 3137 private: 3138 JavaVMInitArgs _args; 3139 char* _container_name; 3140 bool _is_set; 3141 char* _vm_options_file_arg; 3142 3143 public: 3144 ScopedVMInitArgs(const char *container_name) { 3145 _args.version = JNI_VERSION_1_2; 3146 _args.nOptions = 0; 3147 _args.options = NULL; 3148 _args.ignoreUnrecognized = false; 3149 _container_name = (char *)container_name; 3150 _is_set = false; 3151 _vm_options_file_arg = NULL; 3152 } 3153 3154 // Populates the JavaVMInitArgs object represented by this 3155 // ScopedVMInitArgs object with the arguments in options. The 3156 // allocated memory is deleted by the destructor. If this method 3157 // returns anything other than JNI_OK, then this object is in a 3158 // partially constructed state, and should be abandoned. 3159 jint set_args(GrowableArray<JavaVMOption>* options) { 3160 _is_set = true; 3161 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3162 JavaVMOption, options->length(), mtArguments); 3163 if (options_arr == NULL) { 3164 return JNI_ENOMEM; 3165 } 3166 _args.options = options_arr; 3167 3168 for (int i = 0; i < options->length(); i++) { 3169 options_arr[i] = options->at(i); 3170 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3171 if (options_arr[i].optionString == NULL) { 3172 // Rely on the destructor to do cleanup. 3173 _args.nOptions = i; 3174 return JNI_ENOMEM; 3175 } 3176 } 3177 3178 _args.nOptions = options->length(); 3179 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3180 return JNI_OK; 3181 } 3182 3183 JavaVMInitArgs* get() { return &_args; } 3184 char* container_name() { return _container_name; } 3185 bool is_set() { return _is_set; } 3186 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3187 char* vm_options_file_arg() { return _vm_options_file_arg; } 3188 3189 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3190 if (_vm_options_file_arg != NULL) { 3191 os::free(_vm_options_file_arg); 3192 } 3193 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3194 } 3195 3196 ~ScopedVMInitArgs() { 3197 if (_vm_options_file_arg != NULL) { 3198 os::free(_vm_options_file_arg); 3199 } 3200 if (_args.options == NULL) return; 3201 for (int i = 0; i < _args.nOptions; i++) { 3202 os::free(_args.options[i].optionString); 3203 } 3204 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3205 } 3206 3207 // Insert options into this option list, to replace option at 3208 // vm_options_file_pos (-XX:VMOptionsFile) 3209 jint insert(const JavaVMInitArgs* args, 3210 const JavaVMInitArgs* args_to_insert, 3211 const int vm_options_file_pos) { 3212 assert(_args.options == NULL, "shouldn't be set yet"); 3213 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3214 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3215 3216 int length = args->nOptions + args_to_insert->nOptions - 1; 3217 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3218 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3219 for (int i = 0; i < args->nOptions; i++) { 3220 if (i == vm_options_file_pos) { 3221 // insert the new options starting at the same place as the 3222 // -XX:VMOptionsFile option 3223 for (int j = 0; j < args_to_insert->nOptions; j++) { 3224 options->push(args_to_insert->options[j]); 3225 } 3226 } else { 3227 options->push(args->options[i]); 3228 } 3229 } 3230 // make into options array 3231 jint result = set_args(options); 3232 delete options; 3233 return result; 3234 } 3235 }; 3236 3237 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3238 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3239 } 3240 3241 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3242 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3243 } 3244 3245 jint Arguments::parse_options_environment_variable(const char* name, 3246 ScopedVMInitArgs* vm_args) { 3247 char *buffer = ::getenv(name); 3248 3249 // Don't check this environment variable if user has special privileges 3250 // (e.g. unix su command). 3251 if (buffer == NULL || os::have_special_privileges()) { 3252 return JNI_OK; 3253 } 3254 3255 if ((buffer = os::strdup(buffer)) == NULL) { 3256 return JNI_ENOMEM; 3257 } 3258 3259 jio_fprintf(defaultStream::error_stream(), 3260 "Picked up %s: %s\n", name, buffer); 3261 3262 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3263 3264 os::free(buffer); 3265 return retcode; 3266 } 3267 3268 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3269 // read file into buffer 3270 int fd = ::open(file_name, O_RDONLY); 3271 if (fd < 0) { 3272 jio_fprintf(defaultStream::error_stream(), 3273 "Could not open options file '%s'\n", 3274 file_name); 3275 return JNI_ERR; 3276 } 3277 3278 struct stat stbuf; 3279 int retcode = os::stat(file_name, &stbuf); 3280 if (retcode != 0) { 3281 jio_fprintf(defaultStream::error_stream(), 3282 "Could not stat options file '%s'\n", 3283 file_name); 3284 os::close(fd); 3285 return JNI_ERR; 3286 } 3287 3288 if (stbuf.st_size == 0) { 3289 // tell caller there is no option data and that is ok 3290 os::close(fd); 3291 return JNI_OK; 3292 } 3293 3294 // '+ 1' for NULL termination even with max bytes 3295 size_t bytes_alloc = stbuf.st_size + 1; 3296 3297 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3298 if (NULL == buf) { 3299 jio_fprintf(defaultStream::error_stream(), 3300 "Could not allocate read buffer for options file parse\n"); 3301 os::close(fd); 3302 return JNI_ENOMEM; 3303 } 3304 3305 memset(buf, 0, bytes_alloc); 3306 3307 // Fill buffer 3308 // Use ::read() instead of os::read because os::read() 3309 // might do a thread state transition 3310 // and it is too early for that here 3311 3312 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3313 os::close(fd); 3314 if (bytes_read < 0) { 3315 FREE_C_HEAP_ARRAY(char, buf); 3316 jio_fprintf(defaultStream::error_stream(), 3317 "Could not read options file '%s'\n", file_name); 3318 return JNI_ERR; 3319 } 3320 3321 if (bytes_read == 0) { 3322 // tell caller there is no option data and that is ok 3323 FREE_C_HEAP_ARRAY(char, buf); 3324 return JNI_OK; 3325 } 3326 3327 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3328 3329 FREE_C_HEAP_ARRAY(char, buf); 3330 return retcode; 3331 } 3332 3333 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3334 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3335 3336 // some pointers to help with parsing 3337 char *buffer_end = buffer + buf_len; 3338 char *opt_hd = buffer; 3339 char *wrt = buffer; 3340 char *rd = buffer; 3341 3342 // parse all options 3343 while (rd < buffer_end) { 3344 // skip leading white space from the input string 3345 while (rd < buffer_end && isspace(*rd)) { 3346 rd++; 3347 } 3348 3349 if (rd >= buffer_end) { 3350 break; 3351 } 3352 3353 // Remember this is where we found the head of the token. 3354 opt_hd = wrt; 3355 3356 // Tokens are strings of non white space characters separated 3357 // by one or more white spaces. 3358 while (rd < buffer_end && !isspace(*rd)) { 3359 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3360 int quote = *rd; // matching quote to look for 3361 rd++; // don't copy open quote 3362 while (rd < buffer_end && *rd != quote) { 3363 // include everything (even spaces) 3364 // up until the close quote 3365 *wrt++ = *rd++; // copy to option string 3366 } 3367 3368 if (rd < buffer_end) { 3369 rd++; // don't copy close quote 3370 } else { 3371 // did not see closing quote 3372 jio_fprintf(defaultStream::error_stream(), 3373 "Unmatched quote in %s\n", name); 3374 delete options; 3375 return JNI_ERR; 3376 } 3377 } else { 3378 *wrt++ = *rd++; // copy to option string 3379 } 3380 } 3381 3382 // steal a white space character and set it to NULL 3383 *wrt++ = '\0'; 3384 // We now have a complete token 3385 3386 JavaVMOption option; 3387 option.optionString = opt_hd; 3388 option.extraInfo = NULL; 3389 3390 options->append(option); // Fill in option 3391 3392 rd++; // Advance to next character 3393 } 3394 3395 // Fill out JavaVMInitArgs structure. 3396 jint status = vm_args->set_args(options); 3397 3398 delete options; 3399 return status; 3400 } 3401 3402 void Arguments::set_shared_spaces_flags() { 3403 if (DumpSharedSpaces) { 3404 if (FailOverToOldVerifier) { 3405 // Don't fall back to the old verifier on verification failure. If a 3406 // class fails verification with the split verifier, it might fail the 3407 // CDS runtime verifier constraint check. In that case, we don't want 3408 // to share the class. We only archive classes that pass the split verifier. 3409 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3410 } 3411 3412 if (RequireSharedSpaces) { 3413 warning("Cannot dump shared archive while using shared archive"); 3414 } 3415 UseSharedSpaces = false; 3416 #ifdef _LP64 3417 if (!UseCompressedOops || !UseCompressedClassPointers) { 3418 vm_exit_during_initialization( 3419 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3420 } 3421 } else { 3422 if (!UseCompressedOops || !UseCompressedClassPointers) { 3423 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3424 } 3425 #endif 3426 } 3427 } 3428 3429 // Sharing support 3430 // Construct the path to the archive 3431 char* Arguments::get_default_shared_archive_path() { 3432 char *default_archive_path; 3433 char jvm_path[JVM_MAXPATHLEN]; 3434 os::jvm_path(jvm_path, sizeof(jvm_path)); 3435 char *end = strrchr(jvm_path, *os::file_separator()); 3436 if (end != NULL) *end = '\0'; 3437 size_t jvm_path_len = strlen(jvm_path); 3438 size_t file_sep_len = strlen(os::file_separator()); 3439 const size_t len = jvm_path_len + file_sep_len + 20; 3440 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3441 if (default_archive_path != NULL) { 3442 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa", 3443 jvm_path, os::file_separator()); 3444 } 3445 return default_archive_path; 3446 } 3447 3448 static char* get_shared_archive_path() { 3449 char *shared_archive_path; 3450 if (SharedArchiveFile == NULL) { 3451 shared_archive_path = Arguments::get_default_shared_archive_path(); 3452 } else { 3453 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3454 } 3455 return shared_archive_path; 3456 } 3457 3458 #ifndef PRODUCT 3459 // Determine whether LogVMOutput should be implicitly turned on. 3460 static bool use_vm_log() { 3461 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3462 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3463 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3464 PrintAssembly || TraceDeoptimization || TraceDependencies || 3465 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3466 return true; 3467 } 3468 3469 #ifdef COMPILER1 3470 if (PrintC1Statistics) { 3471 return true; 3472 } 3473 #endif // COMPILER1 3474 3475 #ifdef COMPILER2 3476 if (PrintOptoAssembly || PrintOptoStatistics) { 3477 return true; 3478 } 3479 #endif // COMPILER2 3480 3481 return false; 3482 } 3483 3484 #endif // PRODUCT 3485 3486 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3487 for (int index = 0; index < args->nOptions; index++) { 3488 const JavaVMOption* option = args->options + index; 3489 const char* tail; 3490 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3491 return true; 3492 } 3493 } 3494 return false; 3495 } 3496 3497 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3498 const char* vm_options_file, 3499 const int vm_options_file_pos, 3500 ScopedVMInitArgs* vm_options_file_args, 3501 ScopedVMInitArgs* args_out) { 3502 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3503 if (code != JNI_OK) { 3504 return code; 3505 } 3506 3507 if (vm_options_file_args->get()->nOptions < 1) { 3508 return JNI_OK; 3509 } 3510 3511 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3512 jio_fprintf(defaultStream::error_stream(), 3513 "A VM options file may not refer to a VM options file. " 3514 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3515 "options file '%s' in options container '%s' is an error.\n", 3516 vm_options_file_args->vm_options_file_arg(), 3517 vm_options_file_args->container_name()); 3518 return JNI_EINVAL; 3519 } 3520 3521 return args_out->insert(args, vm_options_file_args->get(), 3522 vm_options_file_pos); 3523 } 3524 3525 // Expand -XX:VMOptionsFile found in args_in as needed. 3526 // mod_args and args_out parameters may return values as needed. 3527 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3528 ScopedVMInitArgs* mod_args, 3529 JavaVMInitArgs** args_out) { 3530 jint code = match_special_option_and_act(args_in, mod_args); 3531 if (code != JNI_OK) { 3532 return code; 3533 } 3534 3535 if (mod_args->is_set()) { 3536 // args_in contains -XX:VMOptionsFile and mod_args contains the 3537 // original options from args_in along with the options expanded 3538 // from the VMOptionsFile. Return a short-hand to the caller. 3539 *args_out = mod_args->get(); 3540 } else { 3541 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3542 } 3543 return JNI_OK; 3544 } 3545 3546 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3547 ScopedVMInitArgs* args_out) { 3548 // Remaining part of option string 3549 const char* tail; 3550 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3551 3552 for (int index = 0; index < args->nOptions; index++) { 3553 const JavaVMOption* option = args->options + index; 3554 if (ArgumentsExt::process_options(option)) { 3555 continue; 3556 } 3557 if (match_option(option, "-XX:Flags=", &tail)) { 3558 Arguments::set_jvm_flags_file(tail); 3559 continue; 3560 } 3561 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3562 if (vm_options_file_args.found_vm_options_file_arg()) { 3563 jio_fprintf(defaultStream::error_stream(), 3564 "The option '%s' is already specified in the options " 3565 "container '%s' so the specification of '%s' in the " 3566 "same options container is an error.\n", 3567 vm_options_file_args.vm_options_file_arg(), 3568 vm_options_file_args.container_name(), 3569 option->optionString); 3570 return JNI_EINVAL; 3571 } 3572 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3573 // If there's a VMOptionsFile, parse that 3574 jint code = insert_vm_options_file(args, tail, index, 3575 &vm_options_file_args, args_out); 3576 if (code != JNI_OK) { 3577 return code; 3578 } 3579 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3580 if (args_out->is_set()) { 3581 // The VMOptions file inserted some options so switch 'args' 3582 // to the new set of options, and continue processing which 3583 // preserves "last option wins" semantics. 3584 args = args_out->get(); 3585 // The first option from the VMOptionsFile replaces the 3586 // current option. So we back track to process the 3587 // replacement option. 3588 index--; 3589 } 3590 continue; 3591 } 3592 if (match_option(option, "-XX:+PrintVMOptions")) { 3593 PrintVMOptions = true; 3594 continue; 3595 } 3596 if (match_option(option, "-XX:-PrintVMOptions")) { 3597 PrintVMOptions = false; 3598 continue; 3599 } 3600 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3601 IgnoreUnrecognizedVMOptions = true; 3602 continue; 3603 } 3604 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3605 IgnoreUnrecognizedVMOptions = false; 3606 continue; 3607 } 3608 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3609 JVMFlag::printFlags(tty, false); 3610 vm_exit(0); 3611 } 3612 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3613 #if INCLUDE_NMT 3614 // The launcher did not setup nmt environment variable properly. 3615 if (!MemTracker::check_launcher_nmt_support(tail)) { 3616 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3617 } 3618 3619 // Verify if nmt option is valid. 3620 if (MemTracker::verify_nmt_option()) { 3621 // Late initialization, still in single-threaded mode. 3622 if (MemTracker::tracking_level() >= NMT_summary) { 3623 MemTracker::init(); 3624 } 3625 } else { 3626 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3627 } 3628 continue; 3629 #else 3630 jio_fprintf(defaultStream::error_stream(), 3631 "Native Memory Tracking is not supported in this VM\n"); 3632 return JNI_ERR; 3633 #endif 3634 } 3635 3636 #ifndef PRODUCT 3637 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3638 JVMFlag::printFlags(tty, true); 3639 vm_exit(0); 3640 } 3641 #endif 3642 } 3643 return JNI_OK; 3644 } 3645 3646 static void print_options(const JavaVMInitArgs *args) { 3647 const char* tail; 3648 for (int index = 0; index < args->nOptions; index++) { 3649 const JavaVMOption *option = args->options + index; 3650 if (match_option(option, "-XX:", &tail)) { 3651 logOption(tail); 3652 } 3653 } 3654 } 3655 3656 bool Arguments::handle_deprecated_print_gc_flags() { 3657 if (PrintGC) { 3658 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3659 } 3660 if (PrintGCDetails) { 3661 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3662 } 3663 3664 if (_gc_log_filename != NULL) { 3665 // -Xloggc was used to specify a filename 3666 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3667 3668 LogTarget(Error, logging) target; 3669 LogStream errstream(target); 3670 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3671 } else if (PrintGC || PrintGCDetails) { 3672 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3673 } 3674 return true; 3675 } 3676 3677 void Arguments::handle_extra_cms_flags(const char* msg) { 3678 SpecialFlag flag; 3679 const char *flag_name = "UseConcMarkSweepGC"; 3680 if (lookup_special_flag(flag_name, flag)) { 3681 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 3682 warning("%s", msg); 3683 } 3684 } 3685 3686 // Parse entry point called from JNI_CreateJavaVM 3687 3688 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3689 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 3690 3691 // Initialize ranges, constraints and writeables 3692 JVMFlagRangeList::init(); 3693 JVMFlagConstraintList::init(); 3694 JVMFlagWriteableList::init(); 3695 3696 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3697 const char* hotspotrc = ".hotspotrc"; 3698 bool settings_file_specified = false; 3699 bool needs_hotspotrc_warning = false; 3700 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3701 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3702 3703 // Pointers to current working set of containers 3704 JavaVMInitArgs* cur_cmd_args; 3705 JavaVMInitArgs* cur_java_options_args; 3706 JavaVMInitArgs* cur_java_tool_options_args; 3707 3708 // Containers for modified/expanded options 3709 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3710 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3711 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3712 3713 3714 jint code = 3715 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3716 if (code != JNI_OK) { 3717 return code; 3718 } 3719 3720 code = parse_java_options_environment_variable(&initial_java_options_args); 3721 if (code != JNI_OK) { 3722 return code; 3723 } 3724 3725 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3726 &mod_java_tool_options_args, 3727 &cur_java_tool_options_args); 3728 if (code != JNI_OK) { 3729 return code; 3730 } 3731 3732 code = expand_vm_options_as_needed(initial_cmd_args, 3733 &mod_cmd_args, 3734 &cur_cmd_args); 3735 if (code != JNI_OK) { 3736 return code; 3737 } 3738 3739 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3740 &mod_java_options_args, 3741 &cur_java_options_args); 3742 if (code != JNI_OK) { 3743 return code; 3744 } 3745 3746 const char* flags_file = Arguments::get_jvm_flags_file(); 3747 settings_file_specified = (flags_file != NULL); 3748 3749 if (IgnoreUnrecognizedVMOptions) { 3750 cur_cmd_args->ignoreUnrecognized = true; 3751 cur_java_tool_options_args->ignoreUnrecognized = true; 3752 cur_java_options_args->ignoreUnrecognized = true; 3753 } 3754 3755 // Parse specified settings file 3756 if (settings_file_specified) { 3757 if (!process_settings_file(flags_file, true, 3758 cur_cmd_args->ignoreUnrecognized)) { 3759 return JNI_EINVAL; 3760 } 3761 } else { 3762 #ifdef ASSERT 3763 // Parse default .hotspotrc settings file 3764 if (!process_settings_file(".hotspotrc", false, 3765 cur_cmd_args->ignoreUnrecognized)) { 3766 return JNI_EINVAL; 3767 } 3768 #else 3769 struct stat buf; 3770 if (os::stat(hotspotrc, &buf) == 0) { 3771 needs_hotspotrc_warning = true; 3772 } 3773 #endif 3774 } 3775 3776 if (PrintVMOptions) { 3777 print_options(cur_java_tool_options_args); 3778 print_options(cur_cmd_args); 3779 print_options(cur_java_options_args); 3780 } 3781 3782 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3783 jint result = parse_vm_init_args(cur_java_tool_options_args, 3784 cur_java_options_args, 3785 cur_cmd_args); 3786 3787 if (result != JNI_OK) { 3788 return result; 3789 } 3790 3791 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3792 SharedArchivePath = get_shared_archive_path(); 3793 if (SharedArchivePath == NULL) { 3794 return JNI_ENOMEM; 3795 } 3796 3797 // Set up VerifySharedSpaces 3798 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3799 VerifySharedSpaces = true; 3800 } 3801 3802 // Delay warning until here so that we've had a chance to process 3803 // the -XX:-PrintWarnings flag 3804 if (needs_hotspotrc_warning) { 3805 warning("%s file is present but has been ignored. " 3806 "Run with -XX:Flags=%s to load the file.", 3807 hotspotrc, hotspotrc); 3808 } 3809 3810 if (needs_module_property_warning) { 3811 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3812 " names that are reserved for internal use."); 3813 } 3814 3815 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3816 UNSUPPORTED_OPTION(UseLargePages); 3817 #endif 3818 3819 #if defined(AIX) 3820 UNSUPPORTED_OPTION(AllocateHeapAt); 3821 #endif 3822 3823 ArgumentsExt::report_unsupported_options(); 3824 3825 #ifndef PRODUCT 3826 if (TraceBytecodesAt != 0) { 3827 TraceBytecodes = true; 3828 } 3829 if (CountCompiledCalls) { 3830 if (UseCounterDecay) { 3831 warning("UseCounterDecay disabled because CountCalls is set"); 3832 UseCounterDecay = false; 3833 } 3834 } 3835 #endif // PRODUCT 3836 3837 if (ScavengeRootsInCode == 0) { 3838 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3839 warning("Forcing ScavengeRootsInCode non-zero"); 3840 } 3841 ScavengeRootsInCode = 1; 3842 } 3843 3844 if (!handle_deprecated_print_gc_flags()) { 3845 return JNI_EINVAL; 3846 } 3847 3848 // Set object alignment values. 3849 set_object_alignment(); 3850 3851 #if !INCLUDE_CDS 3852 if (DumpSharedSpaces || RequireSharedSpaces) { 3853 jio_fprintf(defaultStream::error_stream(), 3854 "Shared spaces are not supported in this VM\n"); 3855 return JNI_ERR; 3856 } 3857 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 3858 log_is_enabled(Info, cds)) { 3859 warning("Shared spaces are not supported in this VM"); 3860 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3861 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3862 } 3863 no_shared_spaces("CDS Disabled"); 3864 #endif // INCLUDE_CDS 3865 3866 return JNI_OK; 3867 } 3868 3869 jint Arguments::apply_ergo() { 3870 // Set flags based on ergonomics. 3871 jint result = set_ergonomics_flags(); 3872 if (result != JNI_OK) return result; 3873 3874 // Set heap size based on available physical memory 3875 set_heap_size(); 3876 3877 GCConfig::arguments()->initialize(); 3878 3879 set_shared_spaces_flags(); 3880 3881 // Initialize Metaspace flags and alignments 3882 Metaspace::ergo_initialize(); 3883 3884 // Set compiler flags after GC is selected and GC specific 3885 // flags (LoopStripMiningIter) are set. 3886 CompilerConfig::ergo_initialize(); 3887 3888 // Set bytecode rewriting flags 3889 set_bytecode_flags(); 3890 3891 // Set flags if aggressive optimization flags are enabled 3892 jint code = set_aggressive_opts_flags(); 3893 if (code != JNI_OK) { 3894 return code; 3895 } 3896 3897 // Turn off biased locking for locking debug mode flags, 3898 // which are subtly different from each other but neither works with 3899 // biased locking 3900 if (UseHeavyMonitors 3901 #ifdef COMPILER1 3902 || !UseFastLocking 3903 #endif // COMPILER1 3904 #if INCLUDE_JVMCI 3905 || !JVMCIUseFastLocking 3906 #endif 3907 ) { 3908 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3909 // flag set to true on command line; warn the user that they 3910 // can't enable biased locking here 3911 warning("Biased Locking is not supported with locking debug flags" 3912 "; ignoring UseBiasedLocking flag." ); 3913 } 3914 UseBiasedLocking = false; 3915 } 3916 3917 #ifdef CC_INTERP 3918 // Clear flags not supported on zero. 3919 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3920 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3921 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3922 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3923 #endif // CC_INTERP 3924 3925 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3926 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3927 DebugNonSafepoints = true; 3928 } 3929 3930 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3931 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3932 } 3933 3934 #ifndef PRODUCT 3935 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3936 if (use_vm_log()) { 3937 LogVMOutput = true; 3938 } 3939 } 3940 #endif // PRODUCT 3941 3942 if (PrintCommandLineFlags) { 3943 JVMFlag::printSetFlags(tty); 3944 } 3945 3946 // Apply CPU specific policy for the BiasedLocking 3947 if (UseBiasedLocking) { 3948 if (!VM_Version::use_biased_locking() && 3949 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3950 UseBiasedLocking = false; 3951 } 3952 } 3953 #ifdef COMPILER2 3954 if (!UseBiasedLocking) { 3955 UseOptoBiasInlining = false; 3956 } 3957 #endif 3958 3959 #if defined(IA32) 3960 // Only server compiler can optimize safepoints well enough. 3961 if (!is_server_compilation_mode_vm()) { 3962 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false); 3963 } 3964 #endif 3965 3966 // ThreadLocalHandshakesConstraintFunc handles the constraints. 3967 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 3968 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 3969 } else { 3970 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 3971 } 3972 3973 return JNI_OK; 3974 } 3975 3976 jint Arguments::adjust_after_os() { 3977 if (UseNUMA) { 3978 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 3979 FLAG_SET_ERGO(bool, UseNUMA, false); 3980 } else if (UseParallelGC || UseParallelOldGC) { 3981 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3982 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3983 } 3984 } 3985 // UseNUMAInterleaving is set to ON for all collectors and 3986 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3987 // such as the parallel collector for Linux and Solaris will 3988 // interleave old gen and survivor spaces on top of NUMA 3989 // allocation policy for the eden space. 3990 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3991 // all platforms and ParallelGC on Windows will interleave all 3992 // of the heap spaces across NUMA nodes. 3993 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3994 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3995 } 3996 } 3997 return JNI_OK; 3998 } 3999 4000 int Arguments::PropertyList_count(SystemProperty* pl) { 4001 int count = 0; 4002 while(pl != NULL) { 4003 count++; 4004 pl = pl->next(); 4005 } 4006 return count; 4007 } 4008 4009 // Return the number of readable properties. 4010 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4011 int count = 0; 4012 while(pl != NULL) { 4013 if (pl->is_readable()) { 4014 count++; 4015 } 4016 pl = pl->next(); 4017 } 4018 return count; 4019 } 4020 4021 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4022 assert(key != NULL, "just checking"); 4023 SystemProperty* prop; 4024 for (prop = pl; prop != NULL; prop = prop->next()) { 4025 if (strcmp(key, prop->key()) == 0) return prop->value(); 4026 } 4027 return NULL; 4028 } 4029 4030 // Return the value of the requested property provided that it is a readable property. 4031 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4032 assert(key != NULL, "just checking"); 4033 SystemProperty* prop; 4034 // Return the property value if the keys match and the property is not internal or 4035 // it's the special internal property "jdk.boot.class.path.append". 4036 for (prop = pl; prop != NULL; prop = prop->next()) { 4037 if (strcmp(key, prop->key()) == 0) { 4038 if (!prop->internal()) { 4039 return prop->value(); 4040 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4041 return prop->value(); 4042 } else { 4043 // Property is internal and not jdk.boot.class.path.append so return NULL. 4044 return NULL; 4045 } 4046 } 4047 } 4048 return NULL; 4049 } 4050 4051 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4052 int count = 0; 4053 const char* ret_val = NULL; 4054 4055 while(pl != NULL) { 4056 if(count >= index) { 4057 ret_val = pl->key(); 4058 break; 4059 } 4060 count++; 4061 pl = pl->next(); 4062 } 4063 4064 return ret_val; 4065 } 4066 4067 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4068 int count = 0; 4069 char* ret_val = NULL; 4070 4071 while(pl != NULL) { 4072 if(count >= index) { 4073 ret_val = pl->value(); 4074 break; 4075 } 4076 count++; 4077 pl = pl->next(); 4078 } 4079 4080 return ret_val; 4081 } 4082 4083 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4084 SystemProperty* p = *plist; 4085 if (p == NULL) { 4086 *plist = new_p; 4087 } else { 4088 while (p->next() != NULL) { 4089 p = p->next(); 4090 } 4091 p->set_next(new_p); 4092 } 4093 } 4094 4095 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4096 bool writeable, bool internal) { 4097 if (plist == NULL) 4098 return; 4099 4100 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4101 PropertyList_add(plist, new_p); 4102 } 4103 4104 void Arguments::PropertyList_add(SystemProperty *element) { 4105 PropertyList_add(&_system_properties, element); 4106 } 4107 4108 // This add maintains unique property key in the list. 4109 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4110 PropertyAppendable append, PropertyWriteable writeable, 4111 PropertyInternal internal) { 4112 if (plist == NULL) 4113 return; 4114 4115 // If property key exist then update with new value. 4116 SystemProperty* prop; 4117 for (prop = *plist; prop != NULL; prop = prop->next()) { 4118 if (strcmp(k, prop->key()) == 0) { 4119 if (append == AppendProperty) { 4120 prop->append_value(v); 4121 } else { 4122 prop->set_value(v); 4123 } 4124 return; 4125 } 4126 } 4127 4128 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4129 } 4130 4131 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4132 // Returns true if all of the source pointed by src has been copied over to 4133 // the destination buffer pointed by buf. Otherwise, returns false. 4134 // Notes: 4135 // 1. If the length (buflen) of the destination buffer excluding the 4136 // NULL terminator character is not long enough for holding the expanded 4137 // pid characters, it also returns false instead of returning the partially 4138 // expanded one. 4139 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4140 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4141 char* buf, size_t buflen) { 4142 const char* p = src; 4143 char* b = buf; 4144 const char* src_end = &src[srclen]; 4145 char* buf_end = &buf[buflen - 1]; 4146 4147 while (p < src_end && b < buf_end) { 4148 if (*p == '%') { 4149 switch (*(++p)) { 4150 case '%': // "%%" ==> "%" 4151 *b++ = *p++; 4152 break; 4153 case 'p': { // "%p" ==> current process id 4154 // buf_end points to the character before the last character so 4155 // that we could write '\0' to the end of the buffer. 4156 size_t buf_sz = buf_end - b + 1; 4157 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4158 4159 // if jio_snprintf fails or the buffer is not long enough to hold 4160 // the expanded pid, returns false. 4161 if (ret < 0 || ret >= (int)buf_sz) { 4162 return false; 4163 } else { 4164 b += ret; 4165 assert(*b == '\0', "fail in copy_expand_pid"); 4166 if (p == src_end && b == buf_end + 1) { 4167 // reach the end of the buffer. 4168 return true; 4169 } 4170 } 4171 p++; 4172 break; 4173 } 4174 default : 4175 *b++ = '%'; 4176 } 4177 } else { 4178 *b++ = *p++; 4179 } 4180 } 4181 *b = '\0'; 4182 return (p == src_end); // return false if not all of the source was copied 4183 }