1 /*
   2  * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "jvm.h"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/javaAssertions.hpp"
  29 #include "classfile/moduleEntry.hpp"
  30 #include "classfile/stringTable.hpp"
  31 #include "classfile/symbolTable.hpp"
  32 #include "gc/shared/gcArguments.hpp"
  33 #include "gc/shared/gcConfig.hpp"
  34 #include "logging/log.hpp"
  35 #include "logging/logConfiguration.hpp"
  36 #include "logging/logStream.hpp"
  37 #include "logging/logTag.hpp"
  38 #include "memory/allocation.inline.hpp"
  39 #include "memory/filemap.hpp"
  40 #include "oops/oop.inline.hpp"
  41 #include "prims/jvmtiExport.hpp"
  42 #include "runtime/arguments.hpp"
  43 #include "runtime/flags/jvmFlag.hpp"
  44 #include "runtime/flags/jvmFlagConstraintList.hpp"
  45 #include "runtime/flags/jvmFlagRangeList.hpp"
  46 #include "runtime/globals_extension.hpp"
  47 #include "runtime/java.hpp"
  48 #include "runtime/os.inline.hpp"
  49 #include "runtime/safepoint.hpp"
  50 #include "runtime/safepointMechanism.hpp"
  51 #include "runtime/vm_version.hpp"
  52 #include "services/management.hpp"
  53 #include "services/memTracker.hpp"
  54 #include "utilities/align.hpp"
  55 #include "utilities/defaultStream.hpp"
  56 #include "utilities/macros.hpp"
  57 #include "utilities/powerOfTwo.hpp"
  58 #include "utilities/stringUtils.hpp"
  59 #if INCLUDE_JFR
  60 #include "jfr/jfr.hpp"
  61 #endif
  62 
  63 #define DEFAULT_JAVA_LAUNCHER  "generic"
  64 
  65 char*  Arguments::_jvm_flags_file               = NULL;
  66 char** Arguments::_jvm_flags_array              = NULL;
  67 int    Arguments::_num_jvm_flags                = 0;
  68 char** Arguments::_jvm_args_array               = NULL;
  69 int    Arguments::_num_jvm_args                 = 0;
  70 char*  Arguments::_java_command                 = NULL;
  71 SystemProperty* Arguments::_system_properties   = NULL;
  72 const char*  Arguments::_gc_log_filename        = NULL;
  73 size_t Arguments::_conservative_max_heap_alignment = 0;
  74 Arguments::Mode Arguments::_mode                = _mixed;
  75 bool   Arguments::_java_compiler                = false;
  76 bool   Arguments::_xdebug_mode                  = false;
  77 const char*  Arguments::_java_vendor_url_bug    = NULL;
  78 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  79 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
  80 
  81 // These parameters are reset in method parse_vm_init_args()
  82 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  83 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  84 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  85 bool   Arguments::_ClipInlining                 = ClipInlining;
  86 intx   Arguments::_Tier3InvokeNotifyFreqLog     = Tier3InvokeNotifyFreqLog;
  87 intx   Arguments::_Tier4InvocationThreshold     = Tier4InvocationThreshold;
  88 size_t Arguments::_SharedBaseAddress            = SharedBaseAddress;
  89 
  90 bool   Arguments::_enable_preview               = false;
  91 
  92 char*  Arguments::SharedArchivePath             = NULL;
  93 char*  Arguments::SharedDynamicArchivePath      = NULL;
  94 
  95 AgentLibraryList Arguments::_libraryList;
  96 AgentLibraryList Arguments::_agentList;
  97 
  98 // These are not set by the JDK's built-in launchers, but they can be set by
  99 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
 100 // JavaVMOption in jni.h.
 101 abort_hook_t     Arguments::_abort_hook         = NULL;
 102 exit_hook_t      Arguments::_exit_hook          = NULL;
 103 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 104 
 105 
 106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 107 SystemProperty *Arguments::_java_library_path = NULL;
 108 SystemProperty *Arguments::_java_home = NULL;
 109 SystemProperty *Arguments::_java_class_path = NULL;
 110 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
 111 SystemProperty *Arguments::_vm_info = NULL;
 112 
 113 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
 114 PathString *Arguments::_system_boot_class_path = NULL;
 115 bool Arguments::_has_jimage = false;
 116 
 117 char* Arguments::_ext_dirs = NULL;
 118 
 119 bool PathString::set_value(const char *value) {
 120   if (_value != NULL) {
 121     FreeHeap(_value);
 122   }
 123   _value = AllocateHeap(strlen(value)+1, mtArguments);
 124   assert(_value != NULL, "Unable to allocate space for new path value");
 125   if (_value != NULL) {
 126     strcpy(_value, value);
 127   } else {
 128     // not able to allocate
 129     return false;
 130   }
 131   return true;
 132 }
 133 
 134 void PathString::append_value(const char *value) {
 135   char *sp;
 136   size_t len = 0;
 137   if (value != NULL) {
 138     len = strlen(value);
 139     if (_value != NULL) {
 140       len += strlen(_value);
 141     }
 142     sp = AllocateHeap(len+2, mtArguments);
 143     assert(sp != NULL, "Unable to allocate space for new append path value");
 144     if (sp != NULL) {
 145       if (_value != NULL) {
 146         strcpy(sp, _value);
 147         strcat(sp, os::path_separator());
 148         strcat(sp, value);
 149         FreeHeap(_value);
 150       } else {
 151         strcpy(sp, value);
 152       }
 153       _value = sp;
 154     }
 155   }
 156 }
 157 
 158 PathString::PathString(const char* value) {
 159   if (value == NULL) {
 160     _value = NULL;
 161   } else {
 162     _value = AllocateHeap(strlen(value)+1, mtArguments);
 163     strcpy(_value, value);
 164   }
 165 }
 166 
 167 PathString::~PathString() {
 168   if (_value != NULL) {
 169     FreeHeap(_value);
 170     _value = NULL;
 171   }
 172 }
 173 
 174 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
 175   assert(module_name != NULL && path != NULL, "Invalid module name or path value");
 176   size_t len = strlen(module_name) + 1;
 177   _module_name = AllocateHeap(len, mtInternal);
 178   strncpy(_module_name, module_name, len); // copy the trailing null
 179   _path =  new PathString(path);
 180 }
 181 
 182 ModulePatchPath::~ModulePatchPath() {
 183   if (_module_name != NULL) {
 184     FreeHeap(_module_name);
 185     _module_name = NULL;
 186   }
 187   if (_path != NULL) {
 188     delete _path;
 189     _path = NULL;
 190   }
 191 }
 192 
 193 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
 194   if (key == NULL) {
 195     _key = NULL;
 196   } else {
 197     _key = AllocateHeap(strlen(key)+1, mtArguments);
 198     strcpy(_key, key);
 199   }
 200   _next = NULL;
 201   _internal = internal;
 202   _writeable = writeable;
 203 }
 204 
 205 AgentLibrary::AgentLibrary(const char* name, const char* options,
 206                bool is_absolute_path, void* os_lib,
 207                bool instrument_lib) {
 208   _name = AllocateHeap(strlen(name)+1, mtArguments);
 209   strcpy(_name, name);
 210   if (options == NULL) {
 211     _options = NULL;
 212   } else {
 213     _options = AllocateHeap(strlen(options)+1, mtArguments);
 214     strcpy(_options, options);
 215   }
 216   _is_absolute_path = is_absolute_path;
 217   _os_lib = os_lib;
 218   _next = NULL;
 219   _state = agent_invalid;
 220   _is_static_lib = false;
 221   _is_instrument_lib = instrument_lib;
 222 }
 223 
 224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 225 // part of the option string.
 226 static bool match_option(const JavaVMOption *option, const char* name,
 227                          const char** tail) {
 228   size_t len = strlen(name);
 229   if (strncmp(option->optionString, name, len) == 0) {
 230     *tail = option->optionString + len;
 231     return true;
 232   } else {
 233     return false;
 234   }
 235 }
 236 
 237 // Check if 'option' matches 'name'. No "tail" is allowed.
 238 static bool match_option(const JavaVMOption *option, const char* name) {
 239   const char* tail = NULL;
 240   bool result = match_option(option, name, &tail);
 241   if (tail != NULL && *tail == '\0') {
 242     return result;
 243   } else {
 244     return false;
 245   }
 246 }
 247 
 248 // Return true if any of the strings in null-terminated array 'names' matches.
 249 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 250 // the option must match exactly.
 251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 252   bool tail_allowed) {
 253   for (/* empty */; *names != NULL; ++names) {
 254   if (match_option(option, *names, tail)) {
 255       if (**tail == '\0' || (tail_allowed && **tail == ':')) {
 256         return true;
 257       }
 258     }
 259   }
 260   return false;
 261 }
 262 
 263 #if INCLUDE_JFR
 264 static bool _has_jfr_option = false;  // is using JFR
 265 
 266 // return true on failure
 267 static bool match_jfr_option(const JavaVMOption** option) {
 268   assert((*option)->optionString != NULL, "invariant");
 269   char* tail = NULL;
 270   if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
 271     _has_jfr_option = true;
 272     return Jfr::on_start_flight_recording_option(option, tail);
 273   } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
 274     _has_jfr_option = true;
 275     return Jfr::on_flight_recorder_option(option, tail);
 276   }
 277   return false;
 278 }
 279 
 280 bool Arguments::has_jfr_option() {
 281   return _has_jfr_option;
 282 }
 283 #endif
 284 
 285 static void logOption(const char* opt) {
 286   if (PrintVMOptions) {
 287     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 288   }
 289 }
 290 
 291 bool needs_module_property_warning = false;
 292 
 293 #define MODULE_PROPERTY_PREFIX "jdk.module."
 294 #define MODULE_PROPERTY_PREFIX_LEN 11
 295 #define ADDEXPORTS "addexports"
 296 #define ADDEXPORTS_LEN 10
 297 #define ADDREADS "addreads"
 298 #define ADDREADS_LEN 8
 299 #define ADDOPENS "addopens"
 300 #define ADDOPENS_LEN 8
 301 #define PATCH "patch"
 302 #define PATCH_LEN 5
 303 #define ADDMODS "addmods"
 304 #define ADDMODS_LEN 7
 305 #define LIMITMODS "limitmods"
 306 #define LIMITMODS_LEN 9
 307 #define PATH "path"
 308 #define PATH_LEN 4
 309 #define UPGRADE_PATH "upgrade.path"
 310 #define UPGRADE_PATH_LEN 12
 311 
 312 void Arguments::add_init_library(const char* name, char* options) {
 313   _libraryList.add(new AgentLibrary(name, options, false, NULL));
 314 }
 315 
 316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
 317   _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
 318 }
 319 
 320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
 321   _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
 322 }
 323 
 324 // Late-binding agents not started via arguments
 325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
 326   _agentList.add(agentLib);
 327 }
 328 
 329 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
 330 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
 331   return ((strncmp(option, property, len) == 0) &&
 332           (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
 333 }
 334 
 335 // Return true if property starts with "jdk.module." and its ensuing chars match
 336 // any of the reserved module properties.
 337 // property should be passed without the leading "-D".
 338 bool Arguments::is_internal_module_property(const char* property) {
 339   assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
 340   if  (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
 341     const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
 342     if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
 343         matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
 344         matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
 345         matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
 346         matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
 347         matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
 348         matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
 349         matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
 350       return true;
 351     }
 352   }
 353   return false;
 354 }
 355 
 356 // Process java launcher properties.
 357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 358   // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
 359   // Must do this before setting up other system properties,
 360   // as some of them may depend on launcher type.
 361   for (int index = 0; index < args->nOptions; index++) {
 362     const JavaVMOption* option = args->options + index;
 363     const char* tail;
 364 
 365     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 366       process_java_launcher_argument(tail, option->extraInfo);
 367       continue;
 368     }
 369     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 370       if (strcmp(tail, "true") == 0) {
 371         _sun_java_launcher_is_altjvm = true;
 372       }
 373       continue;
 374     }
 375   }
 376 }
 377 
 378 // Initialize system properties key and value.
 379 void Arguments::init_system_properties() {
 380 
 381   // Set up _system_boot_class_path which is not a property but
 382   // relies heavily on argument processing and the jdk.boot.class.path.append
 383   // property. It is used to store the underlying system boot class path.
 384   _system_boot_class_path = new PathString(NULL);
 385 
 386   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 387                                                            "Java Virtual Machine Specification",  false));
 388   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 389   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 390   PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(),  false));
 391 
 392   // Initialize the vm.info now, but it will need updating after argument parsing.
 393   _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
 394 
 395   // Following are JVMTI agent writable properties.
 396   // Properties values are set to NULL and they are
 397   // os specific they are initialized in os::init_system_properties_values().
 398   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 399   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 400   _java_home =  new SystemProperty("java.home", NULL,  true);
 401   _java_class_path = new SystemProperty("java.class.path", "",  true);
 402   // jdk.boot.class.path.append is a non-writeable, internal property.
 403   // It can only be set by either:
 404   //    - -Xbootclasspath/a:
 405   //    - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
 406   _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
 407 
 408   // Add to System Property list.
 409   PropertyList_add(&_system_properties, _sun_boot_library_path);
 410   PropertyList_add(&_system_properties, _java_library_path);
 411   PropertyList_add(&_system_properties, _java_home);
 412   PropertyList_add(&_system_properties, _java_class_path);
 413   PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
 414   PropertyList_add(&_system_properties, _vm_info);
 415 
 416   // Set OS specific system properties values
 417   os::init_system_properties_values();
 418 }
 419 
 420 // Update/Initialize System properties after JDK version number is known
 421 void Arguments::init_version_specific_system_properties() {
 422   enum { bufsz = 16 };
 423   char buffer[bufsz];
 424   const char* spec_vendor = "Oracle Corporation";
 425   uint32_t spec_version = JDK_Version::current().major_version();
 426 
 427   jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
 428 
 429   PropertyList_add(&_system_properties,
 430       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 431   PropertyList_add(&_system_properties,
 432       new SystemProperty("java.vm.specification.version", buffer, false));
 433   PropertyList_add(&_system_properties,
 434       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 435 }
 436 
 437 /*
 438  *  -XX argument processing:
 439  *
 440  *  -XX arguments are defined in several places, such as:
 441  *      globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
 442  *  -XX arguments are parsed in parse_argument().
 443  *  -XX argument bounds checking is done in check_vm_args_consistency().
 444  *
 445  * Over time -XX arguments may change. There are mechanisms to handle common cases:
 446  *
 447  *      ALIASED: An option that is simply another name for another option. This is often
 448  *               part of the process of deprecating a flag, but not all aliases need
 449  *               to be deprecated.
 450  *
 451  *               Create an alias for an option by adding the old and new option names to the
 452  *               "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
 453  *
 454  *   DEPRECATED: An option that is supported, but a warning is printed to let the user know that
 455  *               support may be removed in the future. Both regular and aliased options may be
 456  *               deprecated.
 457  *
 458  *               Add a deprecation warning for an option (or alias) by adding an entry in the
 459  *               "special_jvm_flags" table and setting the "deprecated_in" field.
 460  *               Often an option "deprecated" in one major release will
 461  *               be made "obsolete" in the next. In this case the entry should also have its
 462  *               "obsolete_in" field set.
 463  *
 464  *     OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
 465  *               on the command line. A warning is printed to let the user know that option might not
 466  *               be accepted in the future.
 467  *
 468  *               Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
 469  *               table and setting the "obsolete_in" field.
 470  *
 471  *      EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
 472  *               to the current JDK version. The system will flatly refuse to admit the existence of
 473  *               the flag. This allows a flag to die automatically over JDK releases.
 474  *
 475  *               Note that manual cleanup of expired options should be done at major JDK version upgrades:
 476  *                  - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
 477  *                  - Newly obsolete or expired deprecated options should have their global variable
 478  *                    definitions removed (from globals.hpp, etc) and related implementations removed.
 479  *
 480  * Recommended approach for removing options:
 481  *
 482  * To remove options commonly used by customers (e.g. product -XX options), use
 483  * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
 484  *
 485  * To remove internal options (e.g. diagnostic, experimental, develop options), use
 486  * a 2-step model adding major release numbers to the obsolete and expire columns.
 487  *
 488  * To change the name of an option, use the alias table as well as a 2-step
 489  * model adding major release numbers to the deprecate and expire columns.
 490  * Think twice about aliasing commonly used customer options.
 491  *
 492  * There are times when it is appropriate to leave a future release number as undefined.
 493  *
 494  * Tests:  Aliases should be tested in VMAliasOptions.java.
 495  *         Deprecated options should be tested in VMDeprecatedOptions.java.
 496  */
 497 
 498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
 499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
 500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
 501 // the command-line as usual, but will issue a warning.
 502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
 503 // the command-line, while issuing a warning and ignoring the flag value.
 504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
 505 // existence of the flag.
 506 //
 507 // MANUAL CLEANUP ON JDK VERSION UPDATES:
 508 // This table ensures that the handling of options will update automatically when the JDK
 509 // version is incremented, but the source code needs to be cleanup up manually:
 510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
 511 //   variable should be removed, as well as users of the variable.
 512 // - As "deprecated" options age into "obsolete" options, move the entry into the
 513 //   "Obsolete Flags" section of the table.
 514 // - All expired options should be removed from the table.
 515 static SpecialFlag const special_jvm_flags[] = {
 516   // -------------- Deprecated Flags --------------
 517   // --- Non-alias flags - sorted by obsolete_in then expired_in:
 518   { "MaxGCMinorPauseMillis",        JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
 519   { "MaxRAMFraction",               JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
 520   { "MinRAMFraction",               JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
 521   { "InitialRAMFraction",           JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
 522   { "UseMembar",                    JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
 523   { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
 524   { "FlightRecorder",               JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
 525   { "MonitorBound",                 JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) },
 526   { "PrintVMQWaitTime",             JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
 527   { "UseNewFieldLayout",            JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
 528   { "ForceNUMA",                    JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) },
 529 
 530   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
 531   { "DefaultMaxRAMFraction",        JDK_Version::jdk(8),  JDK_Version::undefined(), JDK_Version::undefined() },
 532   { "CreateMinidumpOnCrash",        JDK_Version::jdk(9),  JDK_Version::undefined(), JDK_Version::undefined() },
 533   { "TLABStats",                    JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
 534 
 535   // -------------- Obsolete Flags - sorted by expired_in --------------
 536   { "PermSize",                      JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
 537   { "MaxPermSize",                   JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
 538   { "SharedReadWriteSize",           JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
 539   { "SharedReadOnlySize",            JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
 540   { "SharedMiscDataSize",            JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
 541   { "SharedMiscCodeSize",            JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
 542   { "BindGCTaskThreadsToCPUs",       JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
 543   { "UseGCTaskAffinity",             JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
 544   { "GCTaskTimeStampEntries",        JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) },
 545   { "G1RSetScanBlockSize",           JDK_Version::jdk(14),     JDK_Version::jdk(15), JDK_Version::jdk(16) },
 546   { "UseParallelOldGC",              JDK_Version::jdk(14),     JDK_Version::jdk(15), JDK_Version::jdk(16) },
 547   { "CompactFields",                 JDK_Version::jdk(14),     JDK_Version::jdk(15), JDK_Version::jdk(16) },
 548   { "FieldsAllocationStyle",         JDK_Version::jdk(14),     JDK_Version::jdk(15), JDK_Version::jdk(16) },
 549 #ifndef X86
 550   { "UseSSE",                        JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
 551 #endif // !X86
 552   { "UseAdaptiveGCBoundary",         JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) },
 553 
 554 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
 555   // These entries will generate build errors.  Their purpose is to test the macros.
 556   { "dep > obs",                    JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
 557   { "dep > exp ",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
 558   { "obs > exp ",                   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
 559   { "obs > exp",                    JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
 560   { "not deprecated or obsolete",   JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
 561   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 562   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 563 #endif
 564 
 565   { NULL, JDK_Version(0), JDK_Version(0) }
 566 };
 567 
 568 // Flags that are aliases for other flags.
 569 typedef struct {
 570   const char* alias_name;
 571   const char* real_name;
 572 } AliasedFlag;
 573 
 574 static AliasedFlag const aliased_jvm_flags[] = {
 575   { "DefaultMaxRAMFraction",    "MaxRAMFraction"    },
 576   { "CreateMinidumpOnCrash",    "CreateCoredumpOnCrash" },
 577   { NULL, NULL}
 578 };
 579 
 580 // NOTE: A compatibility request will be necessary for each alias to be removed.
 581 static AliasedLoggingFlag const aliased_logging_flags[] = {
 582   { "PrintCompressedOopsMode",   LogLevel::Info,  true,  LOG_TAGS(gc, heap, coops) },
 583   { "PrintSharedSpaces",         LogLevel::Info,  true,  LOG_TAGS(cds) },
 584   { "TraceBiasedLocking",        LogLevel::Info,  true,  LOG_TAGS(biasedlocking) },
 585   { "TraceClassLoading",         LogLevel::Info,  true,  LOG_TAGS(class, load) },
 586   { "TraceClassLoadingPreorder", LogLevel::Debug, true,  LOG_TAGS(class, preorder) },
 587   { "TraceClassPaths",           LogLevel::Info,  true,  LOG_TAGS(class, path) },
 588   { "TraceClassResolution",      LogLevel::Debug, true,  LOG_TAGS(class, resolve) },
 589   { "TraceClassUnloading",       LogLevel::Info,  true,  LOG_TAGS(class, unload) },
 590   { "TraceExceptions",           LogLevel::Info,  true,  LOG_TAGS(exceptions) },
 591   { "TraceInvokeDynamic",        LogLevel::Debug, true,  LOG_TAGS(methodhandles, indy) },
 592   { "TraceLoaderConstraints",    LogLevel::Info,  true,  LOG_TAGS(class, loader, constraints) },
 593   { "TraceMethodHandles",        LogLevel::Info,  true,  LOG_TAGS(methodhandles) },
 594   { "TraceMonitorInflation",     LogLevel::Trace, true,  LOG_TAGS(monitorinflation) },
 595   { "TraceSafepointCleanupTime", LogLevel::Info,  true,  LOG_TAGS(safepoint, cleanup) },
 596   { "TraceJVMTIObjectTagging",   LogLevel::Debug, true,  LOG_TAGS(jvmti, objecttagging) },
 597   { "TraceRedefineClasses",      LogLevel::Info,  false, LOG_TAGS(redefine, class) },
 598   { "PrintJNIResolving",         LogLevel::Debug, true,  LOG_TAGS(jni, resolve) },
 599   { NULL,                        LogLevel::Off,   false, LOG_TAGS(_NO_TAG) }
 600 };
 601 
 602 #ifndef PRODUCT
 603 // These options are removed in jdk9. Remove this code for jdk10.
 604 static AliasedFlag const removed_develop_logging_flags[] = {
 605   { "TraceClassInitialization",   "-Xlog:class+init" },
 606   { "TraceClassLoaderData",       "-Xlog:class+loader+data" },
 607   { "TraceDefaultMethods",        "-Xlog:defaultmethods=debug" },
 608   { "TraceItables",               "-Xlog:itables=debug" },
 609   { "TraceMonitorMismatch",       "-Xlog:monitormismatch=info" },
 610   { "TraceSafepoint",             "-Xlog:safepoint=debug" },
 611   { "TraceStartupTime",           "-Xlog:startuptime" },
 612   { "TraceVMOperation",           "-Xlog:vmoperation=debug" },
 613   { "PrintVtables",               "-Xlog:vtables=debug" },
 614   { "VerboseVerification",        "-Xlog:verification" },
 615   { NULL, NULL }
 616 };
 617 #endif //PRODUCT
 618 
 619 // Return true if "v" is less than "other", where "other" may be "undefined".
 620 static bool version_less_than(JDK_Version v, JDK_Version other) {
 621   assert(!v.is_undefined(), "must be defined");
 622   if (!other.is_undefined() && v.compare(other) >= 0) {
 623     return false;
 624   } else {
 625     return true;
 626   }
 627 }
 628 
 629 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
 630   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 631     if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 632       flag = special_jvm_flags[i];
 633       return true;
 634     }
 635   }
 636   return false;
 637 }
 638 
 639 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
 640   assert(version != NULL, "Must provide a version buffer");
 641   SpecialFlag flag;
 642   if (lookup_special_flag(flag_name, flag)) {
 643     if (!flag.obsolete_in.is_undefined()) {
 644       if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 645         *version = flag.obsolete_in;
 646         // This flag may have been marked for obsoletion in this version, but we may not
 647         // have actually removed it yet. Rather than ignoring it as soon as we reach
 648         // this version we allow some time for the removal to happen. So if the flag
 649         // still actually exists we process it as normal, but issue an adjusted warning.
 650         const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
 651         if (real_flag != NULL) {
 652           char version_str[256];
 653           version->to_string(version_str, sizeof(version_str));
 654           warning("Temporarily processing option %s; support is scheduled for removal in %s",
 655                   flag_name, version_str);
 656           return false;
 657         }
 658         return true;
 659       }
 660     }
 661   }
 662   return false;
 663 }
 664 
 665 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
 666   assert(version != NULL, "Must provide a version buffer");
 667   SpecialFlag flag;
 668   if (lookup_special_flag(flag_name, flag)) {
 669     if (!flag.deprecated_in.is_undefined()) {
 670       if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
 671           version_less_than(JDK_Version::current(), flag.expired_in)) {
 672         *version = flag.deprecated_in;
 673         return 1;
 674       } else {
 675         return -1;
 676       }
 677     }
 678   }
 679   return 0;
 680 }
 681 
 682 #ifndef PRODUCT
 683 const char* Arguments::removed_develop_logging_flag_name(const char* name){
 684   for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
 685     const AliasedFlag& flag = removed_develop_logging_flags[i];
 686     if (strcmp(flag.alias_name, name) == 0) {
 687       return flag.real_name;
 688     }
 689   }
 690   return NULL;
 691 }
 692 #endif // PRODUCT
 693 
 694 const char* Arguments::real_flag_name(const char *flag_name) {
 695   for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
 696     const AliasedFlag& flag_status = aliased_jvm_flags[i];
 697     if (strcmp(flag_status.alias_name, flag_name) == 0) {
 698         return flag_status.real_name;
 699     }
 700   }
 701   return flag_name;
 702 }
 703 
 704 #ifdef ASSERT
 705 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
 706   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 707     if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 708       return true;
 709     }
 710   }
 711   return false;
 712 }
 713 
 714 // Verifies the correctness of the entries in the special_jvm_flags table.
 715 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
 716 // version being earlier than the deprecation version, then a warning is issued
 717 // and verification fails - by returning false. If it is detected that the table
 718 // is out of date, with respect to the current version, then ideally a warning is
 719 // issued but verification does not fail. This allows the VM to operate when the
 720 // version is first updated, without needing to update all the impacted flags at
 721 // the same time. In practice we can't issue the warning immediately when the version
 722 // is updated as it occurs for every test and some tests are not prepared to handle
 723 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
 724 // if the check_globals flag is true, and in addition allow a grace period and only
 725 // check for stale flags when we hit build 25 (which is far enough into the 6 month
 726 // release cycle that all flag updates should have been processed, whilst still
 727 // leaving time to make the change before RDP2).
 728 // We use a gtest to call this, passing true, so that we can detect stale flags before
 729 // the end of the release cycle.
 730 
 731 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
 732 
 733 bool Arguments::verify_special_jvm_flags(bool check_globals) {
 734   bool success = true;
 735   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 736     const SpecialFlag& flag = special_jvm_flags[i];
 737     if (lookup_special_flag(flag.name, i)) {
 738       warning("Duplicate special flag declaration \"%s\"", flag.name);
 739       success = false;
 740     }
 741     if (flag.deprecated_in.is_undefined() &&
 742         flag.obsolete_in.is_undefined()) {
 743       warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
 744       success = false;
 745     }
 746 
 747     if (!flag.deprecated_in.is_undefined()) {
 748       if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
 749         warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
 750         success = false;
 751       }
 752 
 753       if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
 754         warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
 755         success = false;
 756       }
 757     }
 758 
 759     if (!flag.obsolete_in.is_undefined()) {
 760       if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
 761         warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
 762         success = false;
 763       }
 764 
 765       // if flag has become obsolete it should not have a "globals" flag defined anymore.
 766       if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
 767           !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 768         if (JVMFlag::find_declared_flag(flag.name) != NULL) {
 769           warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
 770           success = false;
 771         }
 772       }
 773 
 774     } else if (!flag.expired_in.is_undefined()) {
 775       warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
 776       success = false;
 777     }
 778 
 779     if (!flag.expired_in.is_undefined()) {
 780       // if flag has become expired it should not have a "globals" flag defined anymore.
 781       if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
 782           !version_less_than(JDK_Version::current(), flag.expired_in)) {
 783         if (JVMFlag::find_declared_flag(flag.name) != NULL) {
 784           warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
 785           success = false;
 786         }
 787       }
 788     }
 789   }
 790   return success;
 791 }
 792 #endif
 793 
 794 // Parses a size specification string.
 795 bool Arguments::atojulong(const char *s, julong* result) {
 796   julong n = 0;
 797 
 798   // First char must be a digit. Don't allow negative numbers or leading spaces.
 799   if (!isdigit(*s)) {
 800     return false;
 801   }
 802 
 803   bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
 804   char* remainder;
 805   errno = 0;
 806   n = strtoull(s, &remainder, (is_hex ? 16 : 10));
 807   if (errno != 0) {
 808     return false;
 809   }
 810 
 811   // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
 812   if (remainder == s || strlen(remainder) > 1) {
 813     return false;
 814   }
 815 
 816   switch (*remainder) {
 817     case 'T': case 't':
 818       *result = n * G * K;
 819       // Check for overflow.
 820       if (*result/((julong)G * K) != n) return false;
 821       return true;
 822     case 'G': case 'g':
 823       *result = n * G;
 824       if (*result/G != n) return false;
 825       return true;
 826     case 'M': case 'm':
 827       *result = n * M;
 828       if (*result/M != n) return false;
 829       return true;
 830     case 'K': case 'k':
 831       *result = n * K;
 832       if (*result/K != n) return false;
 833       return true;
 834     case '\0':
 835       *result = n;
 836       return true;
 837     default:
 838       return false;
 839   }
 840 }
 841 
 842 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
 843   if (size < min_size) return arg_too_small;
 844   if (size > max_size) return arg_too_big;
 845   return arg_in_range;
 846 }
 847 
 848 // Describe an argument out of range error
 849 void Arguments::describe_range_error(ArgsRange errcode) {
 850   switch(errcode) {
 851   case arg_too_big:
 852     jio_fprintf(defaultStream::error_stream(),
 853                 "The specified size exceeds the maximum "
 854                 "representable size.\n");
 855     break;
 856   case arg_too_small:
 857   case arg_unreadable:
 858   case arg_in_range:
 859     // do nothing for now
 860     break;
 861   default:
 862     ShouldNotReachHere();
 863   }
 864 }
 865 
 866 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) {
 867   if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) {
 868     return true;
 869   } else {
 870     return false;
 871   }
 872 }
 873 
 874 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
 875   char* end;
 876   errno = 0;
 877   double v = strtod(value, &end);
 878   if ((errno != 0) || (*end != 0)) {
 879     return false;
 880   }
 881 
 882   if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) {
 883     return true;
 884   }
 885   return false;
 886 }
 887 
 888 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) {
 889   julong v;
 890   int int_v;
 891   intx intx_v;
 892   bool is_neg = false;
 893 
 894   if (flag == NULL) {
 895     return false;
 896   }
 897 
 898   // Check the sign first since atojulong() parses only unsigned values.
 899   if (*value == '-') {
 900     if (!flag->is_intx() && !flag->is_int()) {
 901       return false;
 902     }
 903     value++;
 904     is_neg = true;
 905   }
 906   if (!Arguments::atojulong(value, &v)) {
 907     return false;
 908   }
 909   if (flag->is_int()) {
 910     int_v = (int) v;
 911     if (is_neg) {
 912       int_v = -int_v;
 913     }
 914     return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS;
 915   } else if (flag->is_uint()) {
 916     uint uint_v = (uint) v;
 917     return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS;
 918   } else if (flag->is_intx()) {
 919     intx_v = (intx) v;
 920     if (is_neg) {
 921       intx_v = -intx_v;
 922     }
 923     return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS;
 924   } else if (flag->is_uintx()) {
 925     uintx uintx_v = (uintx) v;
 926     return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS;
 927   } else if (flag->is_uint64_t()) {
 928     uint64_t uint64_t_v = (uint64_t) v;
 929     return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS;
 930   } else if (flag->is_size_t()) {
 931     size_t size_t_v = (size_t) v;
 932     return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS;
 933   } else if (flag->is_double()) {
 934     double double_v = (double) v;
 935     return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS;
 936   } else {
 937     return false;
 938   }
 939 }
 940 
 941 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) {
 942   if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false;
 943   // Contract:  JVMFlag always returns a pointer that needs freeing.
 944   FREE_C_HEAP_ARRAY(char, value);
 945   return true;
 946 }
 947 
 948 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) {
 949   const char* old_value = "";
 950   if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false;
 951   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 952   size_t new_len = strlen(new_value);
 953   const char* value;
 954   char* free_this_too = NULL;
 955   if (old_len == 0) {
 956     value = new_value;
 957   } else if (new_len == 0) {
 958     value = old_value;
 959   } else {
 960      size_t length = old_len + 1 + new_len + 1;
 961      char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
 962     // each new setting adds another LINE to the switch:
 963     jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
 964     value = buf;
 965     free_this_too = buf;
 966   }
 967   (void) JVMFlag::ccstrAtPut(flag, &value, origin);
 968   // JVMFlag always returns a pointer that needs freeing.
 969   FREE_C_HEAP_ARRAY(char, value);
 970   // JVMFlag made its own copy, so I must delete my own temp. buffer.
 971   FREE_C_HEAP_ARRAY(char, free_this_too);
 972   return true;
 973 }
 974 
 975 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
 976   const char* real_name = real_flag_name(arg);
 977   JDK_Version since = JDK_Version();
 978   switch (is_deprecated_flag(arg, &since)) {
 979   case -1: {
 980       // Obsolete or expired, so don't process normally,
 981       // but allow for an obsolete flag we're still
 982       // temporarily allowing.
 983       if (!is_obsolete_flag(arg, &since)) {
 984         return real_name;
 985       }
 986       // Note if we're not considered obsolete then we can't be expired either
 987       // as obsoletion must come first.
 988       return NULL;
 989     }
 990     case 0:
 991       return real_name;
 992     case 1: {
 993       if (warn) {
 994         char version[256];
 995         since.to_string(version, sizeof(version));
 996         if (real_name != arg) {
 997           warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
 998                   arg, version, real_name);
 999         } else {
1000           warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
1001                   arg, version);
1002         }
1003       }
1004       return real_name;
1005     }
1006   }
1007   ShouldNotReachHere();
1008   return NULL;
1009 }
1010 
1011 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
1012   LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
1013   // Set tagset string buffer at max size of 256, large enough for any alias tagset
1014   const int max_tagset_size = 256;
1015   int max_tagset_len = max_tagset_size - 1;
1016   char tagset_buffer[max_tagset_size];
1017   tagset_buffer[0] = '\0';
1018 
1019   // Write tag-set for aliased logging option, in string list form
1020   int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1021   for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1022     if (i > 0) {
1023       strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1024     }
1025     strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1026   }
1027   if (!alf.exactMatch) {
1028       strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1029   }
1030   log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1031                          (on) ? "+" : "-",
1032                          name,
1033                          tagset_buffer,
1034                          (on) ? LogLevel::name(alf.level) : "off");
1035 }
1036 
1037 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1038   for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1039     const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1040     if (strcmp(alf.alias_name, name) == 0) {
1041       log_deprecated_flag(name, on, alf);
1042       return alf;
1043     }
1044   }
1045   AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1046   return a;
1047 }
1048 
1049 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1050 
1051   // range of acceptable characters spelled out for portability reasons
1052 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1053 #define BUFLEN 255
1054   char name[BUFLEN+1];
1055   char dummy;
1056   const char* real_name;
1057   bool warn_if_deprecated = true;
1058 
1059   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1060     AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1061     if (alf.alias_name != NULL){
1062       LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1063       return true;
1064     }
1065     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1066     if (real_name == NULL) {
1067       return false;
1068     }
1069     JVMFlag* flag = JVMFlag::find_flag(real_name);
1070     return set_bool_flag(flag, false, origin);
1071   }
1072   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1073     AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1074     if (alf.alias_name != NULL){
1075       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1076       return true;
1077     }
1078     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1079     if (real_name == NULL) {
1080       return false;
1081     }
1082     JVMFlag* flag = JVMFlag::find_flag(real_name);
1083     return set_bool_flag(flag, true, origin);
1084   }
1085 
1086   char punct;
1087   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1088     const char* value = strchr(arg, '=') + 1;
1089 
1090     // this scanf pattern matches both strings (handled here) and numbers (handled later))
1091     AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1092     if (alf.alias_name != NULL) {
1093       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1094       return true;
1095     }
1096     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1097     if (real_name == NULL) {
1098       return false;
1099     }
1100     JVMFlag* flag = JVMFlag::find_flag(real_name);
1101     if (flag != NULL && flag->is_ccstr()) {
1102       if (flag->ccstr_accumulates()) {
1103         return append_to_string_flag(flag, value, origin);
1104       } else {
1105         if (value[0] == '\0') {
1106           value = NULL;
1107         }
1108         return set_string_flag(flag, value, origin);
1109       }
1110     } else {
1111       warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1112     }
1113   }
1114 
1115   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1116     const char* value = strchr(arg, '=') + 1;
1117     // -XX:Foo:=xxx will reset the string flag to the given value.
1118     if (value[0] == '\0') {
1119       value = NULL;
1120     }
1121     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1122     if (real_name == NULL) {
1123       return false;
1124     }
1125     JVMFlag* flag = JVMFlag::find_flag(real_name);
1126     return set_string_flag(flag, value, origin);
1127   }
1128 
1129 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1130 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
1131 #define        NUMBER_RANGE    "[0123456789eE+-]"
1132   char value[BUFLEN + 1];
1133   char value2[BUFLEN + 1];
1134   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1135     // Looks like a floating-point number -- try again with more lenient format string
1136     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1137       real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1138       if (real_name == NULL) {
1139         return false;
1140       }
1141       JVMFlag* flag = JVMFlag::find_flag(real_name);
1142       return set_fp_numeric_flag(flag, value, origin);
1143     }
1144   }
1145 
1146 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1147   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1148     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1149     if (real_name == NULL) {
1150       return false;
1151     }
1152     JVMFlag* flag = JVMFlag::find_flag(real_name);
1153     return set_numeric_flag(flag, value, origin);
1154   }
1155 
1156   return false;
1157 }
1158 
1159 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1160   assert(bldarray != NULL, "illegal argument");
1161 
1162   if (arg == NULL) {
1163     return;
1164   }
1165 
1166   int new_count = *count + 1;
1167 
1168   // expand the array and add arg to the last element
1169   if (*bldarray == NULL) {
1170     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1171   } else {
1172     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1173   }
1174   (*bldarray)[*count] = os::strdup_check_oom(arg);
1175   *count = new_count;
1176 }
1177 
1178 void Arguments::build_jvm_args(const char* arg) {
1179   add_string(&_jvm_args_array, &_num_jvm_args, arg);
1180 }
1181 
1182 void Arguments::build_jvm_flags(const char* arg) {
1183   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1184 }
1185 
1186 // utility function to return a string that concatenates all
1187 // strings in a given char** array
1188 const char* Arguments::build_resource_string(char** args, int count) {
1189   if (args == NULL || count == 0) {
1190     return NULL;
1191   }
1192   size_t length = 0;
1193   for (int i = 0; i < count; i++) {
1194     length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1195   }
1196   char* s = NEW_RESOURCE_ARRAY(char, length);
1197   char* dst = s;
1198   for (int j = 0; j < count; j++) {
1199     size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1200     jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1201     dst += offset;
1202     length -= offset;
1203   }
1204   return (const char*) s;
1205 }
1206 
1207 void Arguments::print_on(outputStream* st) {
1208   st->print_cr("VM Arguments:");
1209   if (num_jvm_flags() > 0) {
1210     st->print("jvm_flags: "); print_jvm_flags_on(st);
1211     st->cr();
1212   }
1213   if (num_jvm_args() > 0) {
1214     st->print("jvm_args: "); print_jvm_args_on(st);
1215     st->cr();
1216   }
1217   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1218   if (_java_class_path != NULL) {
1219     char* path = _java_class_path->value();
1220     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1221   }
1222   st->print_cr("Launcher Type: %s", _sun_java_launcher);
1223 }
1224 
1225 void Arguments::print_summary_on(outputStream* st) {
1226   // Print the command line.  Environment variables that are helpful for
1227   // reproducing the problem are written later in the hs_err file.
1228   // flags are from setting file
1229   if (num_jvm_flags() > 0) {
1230     st->print_raw("Settings File: ");
1231     print_jvm_flags_on(st);
1232     st->cr();
1233   }
1234   // args are the command line and environment variable arguments.
1235   st->print_raw("Command Line: ");
1236   if (num_jvm_args() > 0) {
1237     print_jvm_args_on(st);
1238   }
1239   // this is the classfile and any arguments to the java program
1240   if (java_command() != NULL) {
1241     st->print("%s", java_command());
1242   }
1243   st->cr();
1244 }
1245 
1246 void Arguments::print_jvm_flags_on(outputStream* st) {
1247   if (_num_jvm_flags > 0) {
1248     for (int i=0; i < _num_jvm_flags; i++) {
1249       st->print("%s ", _jvm_flags_array[i]);
1250     }
1251   }
1252 }
1253 
1254 void Arguments::print_jvm_args_on(outputStream* st) {
1255   if (_num_jvm_args > 0) {
1256     for (int i=0; i < _num_jvm_args; i++) {
1257       st->print("%s ", _jvm_args_array[i]);
1258     }
1259   }
1260 }
1261 
1262 bool Arguments::process_argument(const char* arg,
1263                                  jboolean ignore_unrecognized,
1264                                  JVMFlag::Flags origin) {
1265   JDK_Version since = JDK_Version();
1266 
1267   if (parse_argument(arg, origin)) {
1268     return true;
1269   }
1270 
1271   // Determine if the flag has '+', '-', or '=' characters.
1272   bool has_plus_minus = (*arg == '+' || *arg == '-');
1273   const char* const argname = has_plus_minus ? arg + 1 : arg;
1274 
1275   size_t arg_len;
1276   const char* equal_sign = strchr(argname, '=');
1277   if (equal_sign == NULL) {
1278     arg_len = strlen(argname);
1279   } else {
1280     arg_len = equal_sign - argname;
1281   }
1282 
1283   // Only make the obsolete check for valid arguments.
1284   if (arg_len <= BUFLEN) {
1285     // Construct a string which consists only of the argument name without '+', '-', or '='.
1286     char stripped_argname[BUFLEN+1]; // +1 for '\0'
1287     jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1288     if (is_obsolete_flag(stripped_argname, &since)) {
1289       char version[256];
1290       since.to_string(version, sizeof(version));
1291       warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1292       return true;
1293     }
1294 #ifndef PRODUCT
1295     else {
1296       const char* replacement;
1297       if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1298         log_warning(arguments)("%s has been removed. Please use %s instead.",
1299                                stripped_argname,
1300                                replacement);
1301         return false;
1302       }
1303     }
1304 #endif //PRODUCT
1305   }
1306 
1307   // For locked flags, report a custom error message if available.
1308   // Otherwise, report the standard unrecognized VM option.
1309   const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1310   if (found_flag != NULL) {
1311     char locked_message_buf[BUFLEN];
1312     JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1313     if (strlen(locked_message_buf) == 0) {
1314       if (found_flag->is_bool() && !has_plus_minus) {
1315         jio_fprintf(defaultStream::error_stream(),
1316           "Missing +/- setting for VM option '%s'\n", argname);
1317       } else if (!found_flag->is_bool() && has_plus_minus) {
1318         jio_fprintf(defaultStream::error_stream(),
1319           "Unexpected +/- setting in VM option '%s'\n", argname);
1320       } else {
1321         jio_fprintf(defaultStream::error_stream(),
1322           "Improperly specified VM option '%s'\n", argname);
1323       }
1324     } else {
1325 #ifdef PRODUCT
1326       bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1327                          (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1328       if (ignore_unrecognized && mismatched) {
1329         return true;
1330       }
1331 #endif
1332       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1333     }
1334   } else {
1335     if (ignore_unrecognized) {
1336       return true;
1337     }
1338     jio_fprintf(defaultStream::error_stream(),
1339                 "Unrecognized VM option '%s'\n", argname);
1340     JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1341     if (fuzzy_matched != NULL) {
1342       jio_fprintf(defaultStream::error_stream(),
1343                   "Did you mean '%s%s%s'? ",
1344                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1345                   fuzzy_matched->_name,
1346                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
1347     }
1348   }
1349 
1350   // allow for commandline "commenting out" options like -XX:#+Verbose
1351   return arg[0] == '#';
1352 }
1353 
1354 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1355   FILE* stream = fopen(file_name, "rb");
1356   if (stream == NULL) {
1357     if (should_exist) {
1358       jio_fprintf(defaultStream::error_stream(),
1359                   "Could not open settings file %s\n", file_name);
1360       return false;
1361     } else {
1362       return true;
1363     }
1364   }
1365 
1366   char token[1024];
1367   int  pos = 0;
1368 
1369   bool in_white_space = true;
1370   bool in_comment     = false;
1371   bool in_quote       = false;
1372   char quote_c        = 0;
1373   bool result         = true;
1374 
1375   int c = getc(stream);
1376   while(c != EOF && pos < (int)(sizeof(token)-1)) {
1377     if (in_white_space) {
1378       if (in_comment) {
1379         if (c == '\n') in_comment = false;
1380       } else {
1381         if (c == '#') in_comment = true;
1382         else if (!isspace(c)) {
1383           in_white_space = false;
1384           token[pos++] = c;
1385         }
1386       }
1387     } else {
1388       if (c == '\n' || (!in_quote && isspace(c))) {
1389         // token ends at newline, or at unquoted whitespace
1390         // this allows a way to include spaces in string-valued options
1391         token[pos] = '\0';
1392         logOption(token);
1393         result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1394         build_jvm_flags(token);
1395         pos = 0;
1396         in_white_space = true;
1397         in_quote = false;
1398       } else if (!in_quote && (c == '\'' || c == '"')) {
1399         in_quote = true;
1400         quote_c = c;
1401       } else if (in_quote && (c == quote_c)) {
1402         in_quote = false;
1403       } else {
1404         token[pos++] = c;
1405       }
1406     }
1407     c = getc(stream);
1408   }
1409   if (pos > 0) {
1410     token[pos] = '\0';
1411     result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1412     build_jvm_flags(token);
1413   }
1414   fclose(stream);
1415   return result;
1416 }
1417 
1418 //=============================================================================================================
1419 // Parsing of properties (-D)
1420 
1421 const char* Arguments::get_property(const char* key) {
1422   return PropertyList_get_value(system_properties(), key);
1423 }
1424 
1425 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1426   const char* eq = strchr(prop, '=');
1427   const char* key;
1428   const char* value = "";
1429 
1430   if (eq == NULL) {
1431     // property doesn't have a value, thus use passed string
1432     key = prop;
1433   } else {
1434     // property have a value, thus extract it and save to the
1435     // allocated string
1436     size_t key_len = eq - prop;
1437     char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1438 
1439     jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1440     key = tmp_key;
1441 
1442     value = &prop[key_len + 1];
1443   }
1444 
1445   if (strcmp(key, "java.compiler") == 0) {
1446     process_java_compiler_argument(value);
1447     // Record value in Arguments, but let it get passed to Java.
1448   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1449     // sun.java.launcher.is_altjvm property is
1450     // private and is processed in process_sun_java_launcher_properties();
1451     // the sun.java.launcher property is passed on to the java application
1452   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1453     // append is true, writable is true, internal is false
1454     PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1455                             WriteableProperty, ExternalProperty);
1456   } else {
1457     if (strcmp(key, "sun.java.command") == 0) {
1458       char *old_java_command = _java_command;
1459       _java_command = os::strdup_check_oom(value, mtArguments);
1460       if (old_java_command != NULL) {
1461         os::free(old_java_command);
1462       }
1463     } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1464       // If this property is set on the command line then its value will be
1465       // displayed in VM error logs as the URL at which to submit such logs.
1466       // Normally the URL displayed in error logs is different from the value
1467       // of this system property, so a different property should have been
1468       // used here, but we leave this as-is in case someone depends upon it.
1469       const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1470       // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1471       // its value without going through the property list or making a Java call.
1472       _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1473       if (old_java_vendor_url_bug != NULL) {
1474         os::free((void *)old_java_vendor_url_bug);
1475       }
1476     }
1477 
1478     // Create new property and add at the end of the list
1479     PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1480   }
1481 
1482   if (key != prop) {
1483     // SystemProperty copy passed value, thus free previously allocated
1484     // memory
1485     FreeHeap((void *)key);
1486   }
1487 
1488   return true;
1489 }
1490 
1491 #if INCLUDE_CDS
1492 const char* unsupported_properties[] = { "jdk.module.limitmods",
1493                                          "jdk.module.upgrade.path",
1494                                          "jdk.module.patch.0" };
1495 const char* unsupported_options[] = { "--limit-modules",
1496                                       "--upgrade-module-path",
1497                                       "--patch-module"
1498                                     };
1499 void Arguments::check_unsupported_dumping_properties() {
1500   assert(is_dumping_archive(),
1501          "this function is only used with CDS dump time");
1502   assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1503   // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1504   SystemProperty* sp = system_properties();
1505   while (sp != NULL) {
1506     for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1507       if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1508         vm_exit_during_initialization(
1509           "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1510       }
1511     }
1512     sp = sp->next();
1513   }
1514 
1515   // Check for an exploded module build in use with -Xshare:dump.
1516   if (!has_jimage()) {
1517     vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1518   }
1519 }
1520 
1521 bool Arguments::check_unsupported_cds_runtime_properties() {
1522   assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1523   assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1524   if (ArchiveClassesAtExit != NULL) {
1525     // dynamic dumping, just return false for now.
1526     // check_unsupported_dumping_properties() will be called later to check the same set of
1527     // properties, and will exit the VM with the correct error message if the unsupported properties
1528     // are used.
1529     return false;
1530   }
1531   for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1532     if (get_property(unsupported_properties[i]) != NULL) {
1533       if (RequireSharedSpaces) {
1534         warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1535       }
1536       return true;
1537     }
1538   }
1539   return false;
1540 }
1541 #endif
1542 
1543 //===========================================================================================================
1544 // Setting int/mixed/comp mode flags
1545 
1546 void Arguments::set_mode_flags(Mode mode) {
1547   // Set up default values for all flags.
1548   // If you add a flag to any of the branches below,
1549   // add a default value for it here.
1550   set_java_compiler(false);
1551   _mode                      = mode;
1552 
1553   // Ensure Agent_OnLoad has the correct initial values.
1554   // This may not be the final mode; mode may change later in onload phase.
1555   PropertyList_unique_add(&_system_properties, "java.vm.info",
1556                           VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1557 
1558   UseInterpreter             = true;
1559   UseCompiler                = true;
1560   UseLoopCounter             = true;
1561 
1562   // Default values may be platform/compiler dependent -
1563   // use the saved values
1564   ClipInlining               = Arguments::_ClipInlining;
1565   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1566   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1567   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1568   if (TieredCompilation) {
1569     if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1570       Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1571     }
1572     if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1573       Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1574     }
1575   }
1576 
1577   // Change from defaults based on mode
1578   switch (mode) {
1579   default:
1580     ShouldNotReachHere();
1581     break;
1582   case _int:
1583     UseCompiler              = false;
1584     UseLoopCounter           = false;
1585     AlwaysCompileLoopMethods = false;
1586     UseOnStackReplacement    = false;
1587     break;
1588   case _mixed:
1589     // same as default
1590     break;
1591   case _comp:
1592     UseInterpreter           = false;
1593     BackgroundCompilation    = false;
1594     ClipInlining             = false;
1595     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1596     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1597     // compile a level 4 (C2) and then continue executing it.
1598     if (TieredCompilation) {
1599       Tier3InvokeNotifyFreqLog = 0;
1600       Tier4InvocationThreshold = 0;
1601     }
1602     break;
1603   }
1604 }
1605 
1606 // Conflict: required to use shared spaces (-Xshare:on), but
1607 // incompatible command line options were chosen.
1608 static void no_shared_spaces(const char* message) {
1609   if (RequireSharedSpaces) {
1610     jio_fprintf(defaultStream::error_stream(),
1611       "Class data sharing is inconsistent with other specified options.\n");
1612     vm_exit_during_initialization("Unable to use shared archive", message);
1613   } else {
1614     log_info(cds)("Unable to use shared archive: %s", message);
1615     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1616   }
1617 }
1618 
1619 void set_object_alignment() {
1620   // Object alignment.
1621   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1622   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1623   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1624   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1625   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1626   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1627 
1628   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1629   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1630 
1631   // Oop encoding heap max
1632   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1633 
1634   if (SurvivorAlignmentInBytes == 0) {
1635     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1636   }
1637 }
1638 
1639 size_t Arguments::max_heap_for_compressed_oops() {
1640   // Avoid sign flip.
1641   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1642   // We need to fit both the NULL page and the heap into the memory budget, while
1643   // keeping alignment constraints of the heap. To guarantee the latter, as the
1644   // NULL page is located before the heap, we pad the NULL page to the conservative
1645   // maximum alignment that the GC may ever impose upon the heap.
1646   size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1647                                                   _conservative_max_heap_alignment);
1648 
1649   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1650   NOT_LP64(ShouldNotReachHere(); return 0);
1651 }
1652 
1653 void Arguments::set_use_compressed_oops() {
1654 #ifndef ZERO
1655 #ifdef _LP64
1656   // MaxHeapSize is not set up properly at this point, but
1657   // the only value that can override MaxHeapSize if we are
1658   // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1659   size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1660 
1661   if (max_heap_size <= max_heap_for_compressed_oops()) {
1662     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1663       FLAG_SET_ERGO(UseCompressedOops, true);
1664     }
1665   } else {
1666     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1667       warning("Max heap size too large for Compressed Oops");
1668       FLAG_SET_DEFAULT(UseCompressedOops, false);
1669       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1670     }
1671   }
1672 #endif // _LP64
1673 #endif // ZERO
1674 }
1675 
1676 
1677 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1678 // set_use_compressed_oops().
1679 void Arguments::set_use_compressed_klass_ptrs() {
1680 #ifndef ZERO
1681 #ifdef _LP64
1682   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1683   if (!UseCompressedOops) {
1684     if (UseCompressedClassPointers) {
1685       warning("UseCompressedClassPointers requires UseCompressedOops");
1686     }
1687     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1688   } else {
1689     // Turn on UseCompressedClassPointers too
1690     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1691       FLAG_SET_ERGO(UseCompressedClassPointers, true);
1692     }
1693     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1694     if (UseCompressedClassPointers) {
1695       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1696         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1697         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1698       }
1699     }
1700   }
1701 #endif // _LP64
1702 #endif // !ZERO
1703 }
1704 
1705 void Arguments::set_conservative_max_heap_alignment() {
1706   // The conservative maximum required alignment for the heap is the maximum of
1707   // the alignments imposed by several sources: any requirements from the heap
1708   // itself and the maximum page size we may run the VM with.
1709   size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1710   _conservative_max_heap_alignment = MAX4(heap_alignment,
1711                                           (size_t)os::vm_allocation_granularity(),
1712                                           os::max_page_size(),
1713                                           GCArguments::compute_heap_alignment());
1714 }
1715 
1716 jint Arguments::set_ergonomics_flags() {
1717   GCConfig::initialize();
1718 
1719   set_conservative_max_heap_alignment();
1720 
1721 #ifndef ZERO
1722 #ifdef _LP64
1723   set_use_compressed_oops();
1724 
1725   // set_use_compressed_klass_ptrs() must be called after calling
1726   // set_use_compressed_oops().
1727   set_use_compressed_klass_ptrs();
1728 
1729   // Also checks that certain machines are slower with compressed oops
1730   // in vm_version initialization code.
1731 #endif // _LP64
1732 #endif // !ZERO
1733 
1734   return JNI_OK;
1735 }
1736 
1737 julong Arguments::limit_by_allocatable_memory(julong limit) {
1738   julong max_allocatable;
1739   julong result = limit;
1740   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1741     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1742   }
1743   return result;
1744 }
1745 
1746 // Use static initialization to get the default before parsing
1747 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1748 
1749 void Arguments::set_heap_size() {
1750   julong phys_mem;
1751 
1752   // If the user specified one of these options, they
1753   // want specific memory sizing so do not limit memory
1754   // based on compressed oops addressability.
1755   // Also, memory limits will be calculated based on
1756   // available os physical memory, not our MaxRAM limit,
1757   // unless MaxRAM is also specified.
1758   bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1759                            !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1760                            !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1761                            !FLAG_IS_DEFAULT(MinRAMFraction) ||
1762                            !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1763                            !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1764                            !FLAG_IS_DEFAULT(MaxRAM));
1765   if (override_coop_limit) {
1766     if (FLAG_IS_DEFAULT(MaxRAM)) {
1767       phys_mem = os::physical_memory();
1768       FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1769     } else {
1770       phys_mem = (julong)MaxRAM;
1771     }
1772   } else {
1773     phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1774                                        : (julong)MaxRAM;
1775   }
1776 
1777 
1778   // Convert deprecated flags
1779   if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1780       !FLAG_IS_DEFAULT(MaxRAMFraction))
1781     MaxRAMPercentage = 100.0 / MaxRAMFraction;
1782 
1783   if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1784       !FLAG_IS_DEFAULT(MinRAMFraction))
1785     MinRAMPercentage = 100.0 / MinRAMFraction;
1786 
1787   if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1788       !FLAG_IS_DEFAULT(InitialRAMFraction))
1789     InitialRAMPercentage = 100.0 / InitialRAMFraction;
1790 
1791   // If the maximum heap size has not been set with -Xmx,
1792   // then set it as fraction of the size of physical memory,
1793   // respecting the maximum and minimum sizes of the heap.
1794   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1795     julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1796     const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1797     if (reasonable_min < MaxHeapSize) {
1798       // Small physical memory, so use a minimum fraction of it for the heap
1799       reasonable_max = reasonable_min;
1800     } else {
1801       // Not-small physical memory, so require a heap at least
1802       // as large as MaxHeapSize
1803       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1804     }
1805 
1806     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1807       // Limit the heap size to ErgoHeapSizeLimit
1808       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1809     }
1810 
1811 #ifdef _LP64
1812     if (UseCompressedOops) {
1813       // Limit the heap size to the maximum possible when using compressed oops
1814       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1815 
1816       // HeapBaseMinAddress can be greater than default but not less than.
1817       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1818         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1819           // matches compressed oops printing flags
1820           log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1821                                      " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1822                                      DefaultHeapBaseMinAddress,
1823                                      DefaultHeapBaseMinAddress/G,
1824                                      HeapBaseMinAddress);
1825           FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1826         }
1827       }
1828 
1829       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1830         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1831         // but it should be not less than default MaxHeapSize.
1832         max_coop_heap -= HeapBaseMinAddress;
1833       }
1834 
1835       // If user specified flags prioritizing os physical
1836       // memory limits, then disable compressed oops if
1837       // limits exceed max_coop_heap and UseCompressedOops
1838       // was not specified.
1839       if (reasonable_max > max_coop_heap) {
1840         if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1841           log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1842             " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1843             "Please check the setting of MaxRAMPercentage %5.2f."
1844             ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1845           FLAG_SET_ERGO(UseCompressedOops, false);
1846           FLAG_SET_ERGO(UseCompressedClassPointers, false);
1847         } else {
1848           reasonable_max = MIN2(reasonable_max, max_coop_heap);
1849         }
1850       }
1851     }
1852 #endif // _LP64
1853 
1854     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1855 
1856     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1857       // An initial heap size was specified on the command line,
1858       // so be sure that the maximum size is consistent.  Done
1859       // after call to limit_by_allocatable_memory because that
1860       // method might reduce the allocation size.
1861       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1862     } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1863       reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1864     }
1865 
1866     log_trace(gc, heap)("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1867     FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1868   }
1869 
1870   // If the minimum or initial heap_size have not been set or requested to be set
1871   // ergonomically, set them accordingly.
1872   if (InitialHeapSize == 0 || MinHeapSize == 0) {
1873     julong reasonable_minimum = (julong)(OldSize + NewSize);
1874 
1875     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1876 
1877     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1878 
1879     if (InitialHeapSize == 0) {
1880       julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1881 
1882       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1883       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1884 
1885       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1886 
1887       FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1888       log_trace(gc, heap)("  Initial heap size " SIZE_FORMAT, InitialHeapSize);
1889     }
1890     // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1891     // synchronize with InitialHeapSize to avoid errors with the default value.
1892     if (MinHeapSize == 0) {
1893       FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1894       log_trace(gc, heap)("  Minimum heap size " SIZE_FORMAT, MinHeapSize);
1895     }
1896   }
1897 }
1898 
1899 // This option inspects the machine and attempts to set various
1900 // parameters to be optimal for long-running, memory allocation
1901 // intensive jobs.  It is intended for machines with large
1902 // amounts of cpu and memory.
1903 jint Arguments::set_aggressive_heap_flags() {
1904   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1905   // VM, but we may not be able to represent the total physical memory
1906   // available (like having 8gb of memory on a box but using a 32bit VM).
1907   // Thus, we need to make sure we're using a julong for intermediate
1908   // calculations.
1909   julong initHeapSize;
1910   julong total_memory = os::physical_memory();
1911 
1912   if (total_memory < (julong) 256 * M) {
1913     jio_fprintf(defaultStream::error_stream(),
1914             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1915     vm_exit(1);
1916   }
1917 
1918   // The heap size is half of available memory, or (at most)
1919   // all of possible memory less 160mb (leaving room for the OS
1920   // when using ISM).  This is the maximum; because adaptive sizing
1921   // is turned on below, the actual space used may be smaller.
1922 
1923   initHeapSize = MIN2(total_memory / (julong) 2,
1924           total_memory - (julong) 160 * M);
1925 
1926   initHeapSize = limit_by_allocatable_memory(initHeapSize);
1927 
1928   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1929     if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1930       return JNI_EINVAL;
1931     }
1932     if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1933       return JNI_EINVAL;
1934     }
1935     if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1936       return JNI_EINVAL;
1937     }
1938   }
1939   if (FLAG_IS_DEFAULT(NewSize)) {
1940     // Make the young generation 3/8ths of the total heap.
1941     if (FLAG_SET_CMDLINE(NewSize,
1942             ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1943       return JNI_EINVAL;
1944     }
1945     if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1946       return JNI_EINVAL;
1947     }
1948   }
1949 
1950 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
1951   FLAG_SET_DEFAULT(UseLargePages, true);
1952 #endif
1953 
1954   // Increase some data structure sizes for efficiency
1955   if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1956     return JNI_EINVAL;
1957   }
1958   if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1959     return JNI_EINVAL;
1960   }
1961   if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1962     return JNI_EINVAL;
1963   }
1964 
1965   // See the OldPLABSize comment below, but replace 'after promotion'
1966   // with 'after copying'.  YoungPLABSize is the size of the survivor
1967   // space per-gc-thread buffers.  The default is 4kw.
1968   if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1969     return JNI_EINVAL;
1970   }
1971 
1972   // OldPLABSize is the size of the buffers in the old gen that
1973   // UseParallelGC uses to promote live data that doesn't fit in the
1974   // survivor spaces.  At any given time, there's one for each gc thread.
1975   // The default size is 1kw. These buffers are rarely used, since the
1976   // survivor spaces are usually big enough.  For specjbb, however, there
1977   // are occasions when there's lots of live data in the young gen
1978   // and we end up promoting some of it.  We don't have a definite
1979   // explanation for why bumping OldPLABSize helps, but the theory
1980   // is that a bigger PLAB results in retaining something like the
1981   // original allocation order after promotion, which improves mutator
1982   // locality.  A minor effect may be that larger PLABs reduce the
1983   // number of PLAB allocation events during gc.  The value of 8kw
1984   // was arrived at by experimenting with specjbb.
1985   if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1986     return JNI_EINVAL;
1987   }
1988 
1989   // Enable parallel GC and adaptive generation sizing
1990   if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1991     return JNI_EINVAL;
1992   }
1993 
1994   // Encourage steady state memory management
1995   if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1996     return JNI_EINVAL;
1997   }
1998 
1999   // This appears to improve mutator locality
2000   if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2001     return JNI_EINVAL;
2002   }
2003 
2004   return JNI_OK;
2005 }
2006 
2007 // This must be called after ergonomics.
2008 void Arguments::set_bytecode_flags() {
2009   if (!RewriteBytecodes) {
2010     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2011   }
2012 }
2013 
2014 // Aggressive optimization flags
2015 jint Arguments::set_aggressive_opts_flags() {
2016 #ifdef COMPILER2
2017   if (AggressiveUnboxing) {
2018     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2019       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2020     } else if (!EliminateAutoBox) {
2021       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2022       AggressiveUnboxing = false;
2023     }
2024     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2025       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2026     } else if (!DoEscapeAnalysis) {
2027       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2028       AggressiveUnboxing = false;
2029     }
2030   }
2031   if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2032     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2033       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2034     }
2035     // Feed the cache size setting into the JDK
2036     char buffer[1024];
2037     jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2038     if (!add_property(buffer)) {
2039       return JNI_ENOMEM;
2040     }
2041   }
2042 #endif
2043 
2044   return JNI_OK;
2045 }
2046 
2047 //===========================================================================================================
2048 // Parsing of java.compiler property
2049 
2050 void Arguments::process_java_compiler_argument(const char* arg) {
2051   // For backwards compatibility, Djava.compiler=NONE or ""
2052   // causes us to switch to -Xint mode UNLESS -Xdebug
2053   // is also specified.
2054   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2055     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2056   }
2057 }
2058 
2059 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2060   _sun_java_launcher = os::strdup_check_oom(launcher);
2061 }
2062 
2063 bool Arguments::created_by_java_launcher() {
2064   assert(_sun_java_launcher != NULL, "property must have value");
2065   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2066 }
2067 
2068 bool Arguments::sun_java_launcher_is_altjvm() {
2069   return _sun_java_launcher_is_altjvm;
2070 }
2071 
2072 //===========================================================================================================
2073 // Parsing of main arguments
2074 
2075 unsigned int addreads_count = 0;
2076 unsigned int addexports_count = 0;
2077 unsigned int addopens_count = 0;
2078 unsigned int addmods_count = 0;
2079 unsigned int patch_mod_count = 0;
2080 
2081 // Check the consistency of vm_init_args
2082 bool Arguments::check_vm_args_consistency() {
2083   // Method for adding checks for flag consistency.
2084   // The intent is to warn the user of all possible conflicts,
2085   // before returning an error.
2086   // Note: Needs platform-dependent factoring.
2087   bool status = true;
2088 
2089   if (TLABRefillWasteFraction == 0) {
2090     jio_fprintf(defaultStream::error_stream(),
2091                 "TLABRefillWasteFraction should be a denominator, "
2092                 "not " SIZE_FORMAT "\n",
2093                 TLABRefillWasteFraction);
2094     status = false;
2095   }
2096 
2097   if (PrintNMTStatistics) {
2098 #if INCLUDE_NMT
2099     if (MemTracker::tracking_level() == NMT_off) {
2100 #endif // INCLUDE_NMT
2101       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2102       PrintNMTStatistics = false;
2103 #if INCLUDE_NMT
2104     }
2105 #endif
2106   }
2107 
2108   status = CompilerConfig::check_args_consistency(status);
2109 #if INCLUDE_JVMCI
2110   if (status && EnableJVMCI) {
2111     PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2112         AddProperty, UnwriteableProperty, InternalProperty);
2113     if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2114       return false;
2115     }
2116   }
2117 #endif
2118 
2119 #ifndef SUPPORT_RESERVED_STACK_AREA
2120   if (StackReservedPages != 0) {
2121     FLAG_SET_CMDLINE(StackReservedPages, 0);
2122     warning("Reserved Stack Area not supported on this platform");
2123   }
2124 #endif
2125 
2126   status = status && GCArguments::check_args_consistency();
2127 
2128   return status;
2129 }
2130 
2131 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2132   const char* option_type) {
2133   if (ignore) return false;
2134 
2135   const char* spacer = " ";
2136   if (option_type == NULL) {
2137     option_type = ++spacer; // Set both to the empty string.
2138   }
2139 
2140   jio_fprintf(defaultStream::error_stream(),
2141               "Unrecognized %s%soption: %s\n", option_type, spacer,
2142               option->optionString);
2143   return true;
2144 }
2145 
2146 static const char* user_assertion_options[] = {
2147   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2148 };
2149 
2150 static const char* system_assertion_options[] = {
2151   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2152 };
2153 
2154 bool Arguments::parse_uintx(const char* value,
2155                             uintx* uintx_arg,
2156                             uintx min_size) {
2157 
2158   // Check the sign first since atojulong() parses only unsigned values.
2159   bool value_is_positive = !(*value == '-');
2160 
2161   if (value_is_positive) {
2162     julong n;
2163     bool good_return = atojulong(value, &n);
2164     if (good_return) {
2165       bool above_minimum = n >= min_size;
2166       bool value_is_too_large = n > max_uintx;
2167 
2168       if (above_minimum && !value_is_too_large) {
2169         *uintx_arg = n;
2170         return true;
2171       }
2172     }
2173   }
2174   return false;
2175 }
2176 
2177 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2178   size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2179   char* property = AllocateHeap(prop_len, mtArguments);
2180   int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2181   if (ret < 0 || ret >= (int)prop_len) {
2182     FreeHeap(property);
2183     return false;
2184   }
2185   bool added = add_property(property, UnwriteableProperty, internal);
2186   FreeHeap(property);
2187   return added;
2188 }
2189 
2190 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2191   const unsigned int props_count_limit = 1000;
2192   const int max_digits = 3;
2193   const int extra_symbols_count = 3; // includes '.', '=', '\0'
2194 
2195   // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2196   if (count < props_count_limit) {
2197     size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2198     char* property = AllocateHeap(prop_len, mtArguments);
2199     int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2200     if (ret < 0 || ret >= (int)prop_len) {
2201       FreeHeap(property);
2202       jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2203       return false;
2204     }
2205     bool added = add_property(property, UnwriteableProperty, InternalProperty);
2206     FreeHeap(property);
2207     return added;
2208   }
2209 
2210   jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2211   return false;
2212 }
2213 
2214 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2215                                                   julong* long_arg,
2216                                                   julong min_size,
2217                                                   julong max_size) {
2218   if (!atojulong(s, long_arg)) return arg_unreadable;
2219   return check_memory_size(*long_arg, min_size, max_size);
2220 }
2221 
2222 // Parse JavaVMInitArgs structure
2223 
2224 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
2225                                    const JavaVMInitArgs *java_tool_options_args,
2226                                    const JavaVMInitArgs *java_options_args,
2227                                    const JavaVMInitArgs *cmd_line_args) {
2228   bool patch_mod_javabase = false;
2229 
2230   // Save default settings for some mode flags
2231   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2232   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2233   Arguments::_ClipInlining             = ClipInlining;
2234   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2235   if (TieredCompilation) {
2236     Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2237     Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2238   }
2239 
2240   // CDS dumping always write the archive to the default value of SharedBaseAddress.
2241   Arguments::_SharedBaseAddress = SharedBaseAddress;
2242 
2243   // Setup flags for mixed which is the default
2244   set_mode_flags(_mixed);
2245 
2246   // Parse args structure generated from java.base vm options resource
2247   jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE);
2248   if (result != JNI_OK) {
2249     return result;
2250   }
2251 
2252   // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2253   // variable (if present).
2254   result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2255   if (result != JNI_OK) {
2256     return result;
2257   }
2258 
2259   // Parse args structure generated from the command line flags.
2260   result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2261   if (result != JNI_OK) {
2262     return result;
2263   }
2264 
2265   // Parse args structure generated from the _JAVA_OPTIONS environment
2266   // variable (if present) (mimics classic VM)
2267   result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2268   if (result != JNI_OK) {
2269     return result;
2270   }
2271 
2272   // We need to ensure processor and memory resources have been properly
2273   // configured - which may rely on arguments we just processed - before
2274   // doing the final argument processing. Any argument processing that
2275   // needs to know about processor and memory resources must occur after
2276   // this point.
2277 
2278   os::init_container_support();
2279 
2280   // Do final processing now that all arguments have been parsed
2281   result = finalize_vm_init_args(patch_mod_javabase);
2282   if (result != JNI_OK) {
2283     return result;
2284   }
2285 
2286   return JNI_OK;
2287 }
2288 
2289 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2290 // represents a valid JDWP agent.  is_path==true denotes that we
2291 // are dealing with -agentpath (case where name is a path), otherwise with
2292 // -agentlib
2293 bool valid_jdwp_agent(char *name, bool is_path) {
2294   char *_name;
2295   const char *_jdwp = "jdwp";
2296   size_t _len_jdwp, _len_prefix;
2297 
2298   if (is_path) {
2299     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2300       return false;
2301     }
2302 
2303     _name++;  // skip past last path separator
2304     _len_prefix = strlen(JNI_LIB_PREFIX);
2305 
2306     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2307       return false;
2308     }
2309 
2310     _name += _len_prefix;
2311     _len_jdwp = strlen(_jdwp);
2312 
2313     if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2314       _name += _len_jdwp;
2315     }
2316     else {
2317       return false;
2318     }
2319 
2320     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2321       return false;
2322     }
2323 
2324     return true;
2325   }
2326 
2327   if (strcmp(name, _jdwp) == 0) {
2328     return true;
2329   }
2330 
2331   return false;
2332 }
2333 
2334 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2335   // --patch-module=<module>=<file>(<pathsep><file>)*
2336   assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2337   // Find the equal sign between the module name and the path specification
2338   const char* module_equal = strchr(patch_mod_tail, '=');
2339   if (module_equal == NULL) {
2340     jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2341     return JNI_ERR;
2342   } else {
2343     // Pick out the module name
2344     size_t module_len = module_equal - patch_mod_tail;
2345     char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2346     if (module_name != NULL) {
2347       memcpy(module_name, patch_mod_tail, module_len);
2348       *(module_name + module_len) = '\0';
2349       // The path piece begins one past the module_equal sign
2350       add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2351       FREE_C_HEAP_ARRAY(char, module_name);
2352       if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2353         return JNI_ENOMEM;
2354       }
2355     } else {
2356       return JNI_ENOMEM;
2357     }
2358   }
2359   return JNI_OK;
2360 }
2361 
2362 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2363 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2364   // The min and max sizes match the values in globals.hpp, but scaled
2365   // with K. The values have been chosen so that alignment with page
2366   // size doesn't change the max value, which makes the conversions
2367   // back and forth between Xss value and ThreadStackSize value easier.
2368   // The values have also been chosen to fit inside a 32-bit signed type.
2369   const julong min_ThreadStackSize = 0;
2370   const julong max_ThreadStackSize = 1 * M;
2371 
2372   const julong min_size = min_ThreadStackSize * K;
2373   const julong max_size = max_ThreadStackSize * K;
2374 
2375   assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2376 
2377   julong size = 0;
2378   ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2379   if (errcode != arg_in_range) {
2380     bool silent = (option == NULL); // Allow testing to silence error messages
2381     if (!silent) {
2382       jio_fprintf(defaultStream::error_stream(),
2383                   "Invalid thread stack size: %s\n", option->optionString);
2384       describe_range_error(errcode);
2385     }
2386     return JNI_EINVAL;
2387   }
2388 
2389   // Internally track ThreadStackSize in units of 1024 bytes.
2390   const julong size_aligned = align_up(size, K);
2391   assert(size <= size_aligned,
2392          "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2393          size, size_aligned);
2394 
2395   const julong size_in_K = size_aligned / K;
2396   assert(size_in_K < (julong)max_intx,
2397          "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2398          size_in_K);
2399 
2400   // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2401   const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2402   assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2403          "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2404          max_expanded, size_in_K);
2405 
2406   *out_ThreadStackSize = (intx)size_in_K;
2407 
2408   return JNI_OK;
2409 }
2410 
2411 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2412   // For match_option to return remaining or value part of option string
2413   const char* tail;
2414 
2415   // iterate over arguments
2416   for (int index = 0; index < args->nOptions; index++) {
2417     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2418 
2419     const JavaVMOption* option = args->options + index;
2420 
2421     if (!match_option(option, "-Djava.class.path", &tail) &&
2422         !match_option(option, "-Dsun.java.command", &tail) &&
2423         !match_option(option, "-Dsun.java.launcher", &tail)) {
2424 
2425         // add all jvm options to the jvm_args string. This string
2426         // is used later to set the java.vm.args PerfData string constant.
2427         // the -Djava.class.path and the -Dsun.java.command options are
2428         // omitted from jvm_args string as each have their own PerfData
2429         // string constant object.
2430         build_jvm_args(option->optionString);
2431     }
2432 
2433     // -verbose:[class/module/gc/jni]
2434     if (match_option(option, "-verbose", &tail)) {
2435       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2436         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2437         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2438       } else if (!strcmp(tail, ":module")) {
2439         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2440         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2441       } else if (!strcmp(tail, ":gc")) {
2442         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2443       } else if (!strcmp(tail, ":jni")) {
2444         LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2445       }
2446     // -da / -ea / -disableassertions / -enableassertions
2447     // These accept an optional class/package name separated by a colon, e.g.,
2448     // -da:java.lang.Thread.
2449     } else if (match_option(option, user_assertion_options, &tail, true)) {
2450       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2451       if (*tail == '\0') {
2452         JavaAssertions::setUserClassDefault(enable);
2453       } else {
2454         assert(*tail == ':', "bogus match by match_option()");
2455         JavaAssertions::addOption(tail + 1, enable);
2456       }
2457     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2458     } else if (match_option(option, system_assertion_options, &tail, false)) {
2459       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2460       JavaAssertions::setSystemClassDefault(enable);
2461     // -bootclasspath:
2462     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2463         jio_fprintf(defaultStream::output_stream(),
2464           "-Xbootclasspath is no longer a supported option.\n");
2465         return JNI_EINVAL;
2466     // -bootclasspath/a:
2467     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2468       Arguments::append_sysclasspath(tail);
2469     // -bootclasspath/p:
2470     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2471         jio_fprintf(defaultStream::output_stream(),
2472           "-Xbootclasspath/p is no longer a supported option.\n");
2473         return JNI_EINVAL;
2474     // -Xrun
2475     } else if (match_option(option, "-Xrun", &tail)) {
2476       if (tail != NULL) {
2477         const char* pos = strchr(tail, ':');
2478         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2479         char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2480         jio_snprintf(name, len + 1, "%s", tail);
2481 
2482         char *options = NULL;
2483         if(pos != NULL) {
2484           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2485           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2486         }
2487 #if !INCLUDE_JVMTI
2488         if (strcmp(name, "jdwp") == 0) {
2489           jio_fprintf(defaultStream::error_stream(),
2490             "Debugging agents are not supported in this VM\n");
2491           return JNI_ERR;
2492         }
2493 #endif // !INCLUDE_JVMTI
2494         add_init_library(name, options);
2495       }
2496     } else if (match_option(option, "--add-reads=", &tail)) {
2497       if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2498         return JNI_ENOMEM;
2499       }
2500     } else if (match_option(option, "--add-exports=", &tail)) {
2501       if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2502         return JNI_ENOMEM;
2503       }
2504     } else if (match_option(option, "--add-opens=", &tail)) {
2505       if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2506         return JNI_ENOMEM;
2507       }
2508     } else if (match_option(option, "--add-modules=", &tail)) {
2509       if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2510         return JNI_ENOMEM;
2511       }
2512     } else if (match_option(option, "--limit-modules=", &tail)) {
2513       if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2514         return JNI_ENOMEM;
2515       }
2516     } else if (match_option(option, "--module-path=", &tail)) {
2517       if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2518         return JNI_ENOMEM;
2519       }
2520     } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2521       if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2522         return JNI_ENOMEM;
2523       }
2524     } else if (match_option(option, "--patch-module=", &tail)) {
2525       // --patch-module=<module>=<file>(<pathsep><file>)*
2526       int res = process_patch_mod_option(tail, patch_mod_javabase);
2527       if (res != JNI_OK) {
2528         return res;
2529       }
2530     } else if (match_option(option, "--illegal-access=", &tail)) {
2531       if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2532         return JNI_ENOMEM;
2533       }
2534     // -agentlib and -agentpath
2535     } else if (match_option(option, "-agentlib:", &tail) ||
2536           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2537       if(tail != NULL) {
2538         const char* pos = strchr(tail, '=');
2539         char* name;
2540         if (pos == NULL) {
2541           name = os::strdup_check_oom(tail, mtArguments);
2542         } else {
2543           size_t len = pos - tail;
2544           name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2545           memcpy(name, tail, len);
2546           name[len] = '\0';
2547         }
2548 
2549         char *options = NULL;
2550         if(pos != NULL) {
2551           options = os::strdup_check_oom(pos + 1, mtArguments);
2552         }
2553 #if !INCLUDE_JVMTI
2554         if (valid_jdwp_agent(name, is_absolute_path)) {
2555           jio_fprintf(defaultStream::error_stream(),
2556             "Debugging agents are not supported in this VM\n");
2557           return JNI_ERR;
2558         }
2559 #endif // !INCLUDE_JVMTI
2560         add_init_agent(name, options, is_absolute_path);
2561       }
2562     // -javaagent
2563     } else if (match_option(option, "-javaagent:", &tail)) {
2564 #if !INCLUDE_JVMTI
2565       jio_fprintf(defaultStream::error_stream(),
2566         "Instrumentation agents are not supported in this VM\n");
2567       return JNI_ERR;
2568 #else
2569       if (tail != NULL) {
2570         size_t length = strlen(tail) + 1;
2571         char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2572         jio_snprintf(options, length, "%s", tail);
2573         add_instrument_agent("instrument", options, false);
2574         // java agents need module java.instrument
2575         if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2576           return JNI_ENOMEM;
2577         }
2578       }
2579 #endif // !INCLUDE_JVMTI
2580     // --enable_preview
2581     } else if (match_option(option, "--enable-preview")) {
2582       set_enable_preview();
2583     // -Xnoclassgc
2584     } else if (match_option(option, "-Xnoclassgc")) {
2585       if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2586         return JNI_EINVAL;
2587       }
2588     // -Xbatch
2589     } else if (match_option(option, "-Xbatch")) {
2590       if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2591         return JNI_EINVAL;
2592       }
2593     // -Xmn for compatibility with other JVM vendors
2594     } else if (match_option(option, "-Xmn", &tail)) {
2595       julong long_initial_young_size = 0;
2596       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2597       if (errcode != arg_in_range) {
2598         jio_fprintf(defaultStream::error_stream(),
2599                     "Invalid initial young generation size: %s\n", option->optionString);
2600         describe_range_error(errcode);
2601         return JNI_EINVAL;
2602       }
2603       if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2604         return JNI_EINVAL;
2605       }
2606       if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2607         return JNI_EINVAL;
2608       }
2609     // -Xms
2610     } else if (match_option(option, "-Xms", &tail)) {
2611       julong size = 0;
2612       // an initial heap size of 0 means automatically determine
2613       ArgsRange errcode = parse_memory_size(tail, &size, 0);
2614       if (errcode != arg_in_range) {
2615         jio_fprintf(defaultStream::error_stream(),
2616                     "Invalid initial heap size: %s\n", option->optionString);
2617         describe_range_error(errcode);
2618         return JNI_EINVAL;
2619       }
2620       if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2621         return JNI_EINVAL;
2622       }
2623       if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2624         return JNI_EINVAL;
2625       }
2626     // -Xmx
2627     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2628       julong long_max_heap_size = 0;
2629       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2630       if (errcode != arg_in_range) {
2631         jio_fprintf(defaultStream::error_stream(),
2632                     "Invalid maximum heap size: %s\n", option->optionString);
2633         describe_range_error(errcode);
2634         return JNI_EINVAL;
2635       }
2636       if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2637         return JNI_EINVAL;
2638       }
2639     // Xmaxf
2640     } else if (match_option(option, "-Xmaxf", &tail)) {
2641       char* err;
2642       int maxf = (int)(strtod(tail, &err) * 100);
2643       if (*err != '\0' || *tail == '\0') {
2644         jio_fprintf(defaultStream::error_stream(),
2645                     "Bad max heap free percentage size: %s\n",
2646                     option->optionString);
2647         return JNI_EINVAL;
2648       } else {
2649         if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2650             return JNI_EINVAL;
2651         }
2652       }
2653     // Xminf
2654     } else if (match_option(option, "-Xminf", &tail)) {
2655       char* err;
2656       int minf = (int)(strtod(tail, &err) * 100);
2657       if (*err != '\0' || *tail == '\0') {
2658         jio_fprintf(defaultStream::error_stream(),
2659                     "Bad min heap free percentage size: %s\n",
2660                     option->optionString);
2661         return JNI_EINVAL;
2662       } else {
2663         if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2664           return JNI_EINVAL;
2665         }
2666       }
2667     // -Xss
2668     } else if (match_option(option, "-Xss", &tail)) {
2669       intx value = 0;
2670       jint err = parse_xss(option, tail, &value);
2671       if (err != JNI_OK) {
2672         return err;
2673       }
2674       if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2675         return JNI_EINVAL;
2676       }
2677     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2678                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2679       julong long_ReservedCodeCacheSize = 0;
2680 
2681       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2682       if (errcode != arg_in_range) {
2683         jio_fprintf(defaultStream::error_stream(),
2684                     "Invalid maximum code cache size: %s.\n", option->optionString);
2685         return JNI_EINVAL;
2686       }
2687       if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2688         return JNI_EINVAL;
2689       }
2690     // -green
2691     } else if (match_option(option, "-green")) {
2692       jio_fprintf(defaultStream::error_stream(),
2693                   "Green threads support not available\n");
2694           return JNI_EINVAL;
2695     // -native
2696     } else if (match_option(option, "-native")) {
2697           // HotSpot always uses native threads, ignore silently for compatibility
2698     // -Xrs
2699     } else if (match_option(option, "-Xrs")) {
2700           // Classic/EVM option, new functionality
2701       if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2702         return JNI_EINVAL;
2703       }
2704       // -Xprof
2705     } else if (match_option(option, "-Xprof")) {
2706       char version[256];
2707       // Obsolete in JDK 10
2708       JDK_Version::jdk(10).to_string(version, sizeof(version));
2709       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2710     // -Xinternalversion
2711     } else if (match_option(option, "-Xinternalversion")) {
2712       jio_fprintf(defaultStream::output_stream(), "%s\n",
2713                   VM_Version::internal_vm_info_string());
2714       vm_exit(0);
2715 #ifndef PRODUCT
2716     // -Xprintflags
2717     } else if (match_option(option, "-Xprintflags")) {
2718       JVMFlag::printFlags(tty, false);
2719       vm_exit(0);
2720 #endif
2721     // -D
2722     } else if (match_option(option, "-D", &tail)) {
2723       const char* value;
2724       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2725             *value!= '\0' && strcmp(value, "\"\"") != 0) {
2726         // abort if -Djava.endorsed.dirs is set
2727         jio_fprintf(defaultStream::output_stream(),
2728           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2729           "in modular form will be supported via the concept of upgradeable modules.\n", value);
2730         return JNI_EINVAL;
2731       }
2732       if (match_option(option, "-Djava.ext.dirs=", &value) &&
2733             *value != '\0' && strcmp(value, "\"\"") != 0) {
2734         // abort if -Djava.ext.dirs is set
2735         jio_fprintf(defaultStream::output_stream(),
2736           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
2737         return JNI_EINVAL;
2738       }
2739       // Check for module related properties.  They must be set using the modules
2740       // options. For example: use "--add-modules=java.sql", not
2741       // "-Djdk.module.addmods=java.sql"
2742       if (is_internal_module_property(option->optionString + 2)) {
2743         needs_module_property_warning = true;
2744         continue;
2745       }
2746       if (!add_property(tail)) {
2747         return JNI_ENOMEM;
2748       }
2749       // Out of the box management support
2750       if (match_option(option, "-Dcom.sun.management", &tail)) {
2751 #if INCLUDE_MANAGEMENT
2752         if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2753           return JNI_EINVAL;
2754         }
2755         // management agent in module jdk.management.agent
2756         if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2757           return JNI_ENOMEM;
2758         }
2759 #else
2760         jio_fprintf(defaultStream::output_stream(),
2761           "-Dcom.sun.management is not supported in this VM.\n");
2762         return JNI_ERR;
2763 #endif
2764       }
2765     // -Xint
2766     } else if (match_option(option, "-Xint")) {
2767           set_mode_flags(_int);
2768     // -Xmixed
2769     } else if (match_option(option, "-Xmixed")) {
2770           set_mode_flags(_mixed);
2771     // -Xcomp
2772     } else if (match_option(option, "-Xcomp")) {
2773       // for testing the compiler; turn off all flags that inhibit compilation
2774           set_mode_flags(_comp);
2775     // -Xshare:dump
2776     } else if (match_option(option, "-Xshare:dump")) {
2777       if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2778         return JNI_EINVAL;
2779       }
2780     // -Xshare:on
2781     } else if (match_option(option, "-Xshare:on")) {
2782       if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2783         return JNI_EINVAL;
2784       }
2785       if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2786         return JNI_EINVAL;
2787       }
2788     // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2789     } else if (match_option(option, "-Xshare:auto")) {
2790       if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2791         return JNI_EINVAL;
2792       }
2793       if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2794         return JNI_EINVAL;
2795       }
2796     // -Xshare:off
2797     } else if (match_option(option, "-Xshare:off")) {
2798       if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2799         return JNI_EINVAL;
2800       }
2801       if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2802         return JNI_EINVAL;
2803       }
2804     // -Xverify
2805     } else if (match_option(option, "-Xverify", &tail)) {
2806       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2807         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2808           return JNI_EINVAL;
2809         }
2810         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2811           return JNI_EINVAL;
2812         }
2813       } else if (strcmp(tail, ":remote") == 0) {
2814         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2815           return JNI_EINVAL;
2816         }
2817         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2818           return JNI_EINVAL;
2819         }
2820       } else if (strcmp(tail, ":none") == 0) {
2821         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2822           return JNI_EINVAL;
2823         }
2824         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2825           return JNI_EINVAL;
2826         }
2827         warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2828       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2829         return JNI_EINVAL;
2830       }
2831     // -Xdebug
2832     } else if (match_option(option, "-Xdebug")) {
2833       // note this flag has been used, then ignore
2834       set_xdebug_mode(true);
2835     // -Xnoagent
2836     } else if (match_option(option, "-Xnoagent")) {
2837       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2838     } else if (match_option(option, "-Xloggc:", &tail)) {
2839       // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2840       log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2841       _gc_log_filename = os::strdup_check_oom(tail);
2842     } else if (match_option(option, "-Xlog", &tail)) {
2843       bool ret = false;
2844       if (strcmp(tail, ":help") == 0) {
2845         fileStream stream(defaultStream::output_stream());
2846         LogConfiguration::print_command_line_help(&stream);
2847         vm_exit(0);
2848       } else if (strcmp(tail, ":disable") == 0) {
2849         LogConfiguration::disable_logging();
2850         ret = true;
2851       } else if (*tail == '\0') {
2852         ret = LogConfiguration::parse_command_line_arguments();
2853         assert(ret, "-Xlog without arguments should never fail to parse");
2854       } else if (*tail == ':') {
2855         ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2856       }
2857       if (ret == false) {
2858         jio_fprintf(defaultStream::error_stream(),
2859                     "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2860                     tail);
2861         return JNI_EINVAL;
2862       }
2863     // JNI hooks
2864     } else if (match_option(option, "-Xcheck", &tail)) {
2865       if (!strcmp(tail, ":jni")) {
2866 #if !INCLUDE_JNI_CHECK
2867         warning("JNI CHECKING is not supported in this VM");
2868 #else
2869         CheckJNICalls = true;
2870 #endif // INCLUDE_JNI_CHECK
2871       } else if (is_bad_option(option, args->ignoreUnrecognized,
2872                                      "check")) {
2873         return JNI_EINVAL;
2874       }
2875     } else if (match_option(option, "vfprintf")) {
2876       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2877     } else if (match_option(option, "exit")) {
2878       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2879     } else if (match_option(option, "abort")) {
2880       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2881     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2882     // and the last option wins.
2883     } else if (match_option(option, "-XX:+NeverTenure")) {
2884       if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2885         return JNI_EINVAL;
2886       }
2887       if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2888         return JNI_EINVAL;
2889       }
2890       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2891         return JNI_EINVAL;
2892       }
2893     } else if (match_option(option, "-XX:+AlwaysTenure")) {
2894       if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2895         return JNI_EINVAL;
2896       }
2897       if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2898         return JNI_EINVAL;
2899       }
2900       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2901         return JNI_EINVAL;
2902       }
2903     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2904       uintx max_tenuring_thresh = 0;
2905       if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2906         jio_fprintf(defaultStream::error_stream(),
2907                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2908         return JNI_EINVAL;
2909       }
2910 
2911       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2912         return JNI_EINVAL;
2913       }
2914 
2915       if (MaxTenuringThreshold == 0) {
2916         if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2917           return JNI_EINVAL;
2918         }
2919         if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2920           return JNI_EINVAL;
2921         }
2922       } else {
2923         if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2924           return JNI_EINVAL;
2925         }
2926         if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2927           return JNI_EINVAL;
2928         }
2929       }
2930     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2931       if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2932         return JNI_EINVAL;
2933       }
2934       if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2935         return JNI_EINVAL;
2936       }
2937     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2938       if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2939         return JNI_EINVAL;
2940       }
2941       if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2942         return JNI_EINVAL;
2943       }
2944     } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2945       if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2946         return JNI_EINVAL;
2947       }
2948       if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2949         return JNI_EINVAL;
2950       }
2951     } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2952       if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2953         return JNI_EINVAL;
2954       }
2955       if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2956         return JNI_EINVAL;
2957       }
2958     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2959 #if defined(DTRACE_ENABLED)
2960       if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2961         return JNI_EINVAL;
2962       }
2963       if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2964         return JNI_EINVAL;
2965       }
2966       if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2967         return JNI_EINVAL;
2968       }
2969       if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2970         return JNI_EINVAL;
2971       }
2972 #else // defined(DTRACE_ENABLED)
2973       jio_fprintf(defaultStream::error_stream(),
2974                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2975       return JNI_EINVAL;
2976 #endif // defined(DTRACE_ENABLED)
2977 #ifdef ASSERT
2978     } else if (match_option(option, "-XX:+FullGCALot")) {
2979       if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2980         return JNI_EINVAL;
2981       }
2982       // disable scavenge before parallel mark-compact
2983       if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2984         return JNI_EINVAL;
2985       }
2986 #endif
2987 #if !INCLUDE_MANAGEMENT
2988     } else if (match_option(option, "-XX:+ManagementServer")) {
2989         jio_fprintf(defaultStream::error_stream(),
2990           "ManagementServer is not supported in this VM.\n");
2991         return JNI_ERR;
2992 #endif // INCLUDE_MANAGEMENT
2993 #if INCLUDE_JVMCI
2994     } else if (match_option(option, "-XX:-EnableJVMCIProduct")) {
2995       if (EnableJVMCIProduct) {
2996         jio_fprintf(defaultStream::error_stream(),
2997                   "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n");
2998         return JNI_EINVAL;
2999       }
3000     } else if (match_option(option, "-XX:+EnableJVMCIProduct")) {
3001       JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
3002       // Allow this flag if it has been unlocked.
3003       if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) {
3004         if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) {
3005           jio_fprintf(defaultStream::error_stream(),
3006             "Unable to enable JVMCI in product mode");
3007           return JNI_ERR;
3008         }
3009       }
3010       // The flag was locked so process normally to report that error
3011       else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
3012         return JNI_EINVAL;
3013       }
3014 #endif // INCLUDE_JVMCI
3015 #if INCLUDE_JFR
3016     } else if (match_jfr_option(&option)) {
3017       return JNI_EINVAL;
3018 #endif
3019     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3020       // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3021       // already been handled
3022       if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3023           (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3024         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3025           return JNI_EINVAL;
3026         }
3027       }
3028     // Unknown option
3029     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3030       return JNI_ERR;
3031     }
3032   }
3033 
3034   // PrintSharedArchiveAndExit will turn on
3035   //   -Xshare:on
3036   //   -Xlog:class+path=info
3037   if (PrintSharedArchiveAndExit) {
3038     if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3039       return JNI_EINVAL;
3040     }
3041     if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3042       return JNI_EINVAL;
3043     }
3044     LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3045   }
3046 
3047   fix_appclasspath();
3048 
3049   return JNI_OK;
3050 }
3051 
3052 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3053   // For java.base check for duplicate --patch-module options being specified on the command line.
3054   // This check is only required for java.base, all other duplicate module specifications
3055   // will be checked during module system initialization.  The module system initialization
3056   // will throw an ExceptionInInitializerError if this situation occurs.
3057   if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3058     if (*patch_mod_javabase) {
3059       vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3060     } else {
3061       *patch_mod_javabase = true;
3062     }
3063   }
3064 
3065   // Create GrowableArray lazily, only if --patch-module has been specified
3066   if (_patch_mod_prefix == NULL) {
3067     _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3068   }
3069 
3070   _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3071 }
3072 
3073 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3074 //
3075 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3076 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3077 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3078 // path is treated as the current directory.
3079 //
3080 // This causes problems with CDS, which requires that all directories specified in the classpath
3081 // must be empty. In most cases, applications do NOT want to load classes from the current
3082 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3083 // scripts compatible with CDS.
3084 void Arguments::fix_appclasspath() {
3085   if (IgnoreEmptyClassPaths) {
3086     const char separator = *os::path_separator();
3087     const char* src = _java_class_path->value();
3088 
3089     // skip over all the leading empty paths
3090     while (*src == separator) {
3091       src ++;
3092     }
3093 
3094     char* copy = os::strdup_check_oom(src, mtArguments);
3095 
3096     // trim all trailing empty paths
3097     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3098       *tail = '\0';
3099     }
3100 
3101     char from[3] = {separator, separator, '\0'};
3102     char to  [2] = {separator, '\0'};
3103     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3104       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3105       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3106     }
3107 
3108     _java_class_path->set_writeable_value(copy);
3109     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3110   }
3111 }
3112 
3113 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3114   // check if the default lib/endorsed directory exists; if so, error
3115   char path[JVM_MAXPATHLEN];
3116   const char* fileSep = os::file_separator();
3117   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3118 
3119   DIR* dir = os::opendir(path);
3120   if (dir != NULL) {
3121     jio_fprintf(defaultStream::output_stream(),
3122       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3123       "in modular form will be supported via the concept of upgradeable modules.\n");
3124     os::closedir(dir);
3125     return JNI_ERR;
3126   }
3127 
3128   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3129   dir = os::opendir(path);
3130   if (dir != NULL) {
3131     jio_fprintf(defaultStream::output_stream(),
3132       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3133       "Use -classpath instead.\n.");
3134     os::closedir(dir);
3135     return JNI_ERR;
3136   }
3137 
3138   // This must be done after all arguments have been processed
3139   // and the container support has been initialized since AggressiveHeap
3140   // relies on the amount of total memory available.
3141   if (AggressiveHeap) {
3142     jint result = set_aggressive_heap_flags();
3143     if (result != JNI_OK) {
3144       return result;
3145     }
3146   }
3147 
3148   // This must be done after all arguments have been processed.
3149   // java_compiler() true means set to "NONE" or empty.
3150   if (java_compiler() && !xdebug_mode()) {
3151     // For backwards compatibility, we switch to interpreted mode if
3152     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3153     // not specified.
3154     set_mode_flags(_int);
3155   }
3156 
3157   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3158   // but like -Xint, leave compilation thresholds unaffected.
3159   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3160   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3161     set_mode_flags(_int);
3162   }
3163 
3164   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3165   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3166     FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3167   }
3168 
3169 #if !COMPILER2_OR_JVMCI
3170   // Don't degrade server performance for footprint
3171   if (FLAG_IS_DEFAULT(UseLargePages) &&
3172       MaxHeapSize < LargePageHeapSizeThreshold) {
3173     // No need for large granularity pages w/small heaps.
3174     // Note that large pages are enabled/disabled for both the
3175     // Java heap and the code cache.
3176     FLAG_SET_DEFAULT(UseLargePages, false);
3177   }
3178 
3179   UNSUPPORTED_OPTION(ProfileInterpreter);
3180   NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3181 #endif
3182 
3183 
3184 #ifdef TIERED
3185   // Parse the CompilationMode flag
3186   if (!CompilationModeFlag::initialize()) {
3187     return JNI_ERR;
3188   }
3189 #else
3190   // Tiered compilation is undefined.
3191   UNSUPPORTED_OPTION(TieredCompilation);
3192 #endif
3193 
3194   if (!check_vm_args_consistency()) {
3195     return JNI_ERR;
3196   }
3197 
3198 #if INCLUDE_CDS
3199   if (DumpSharedSpaces) {
3200     // Disable biased locking now as it interferes with the clean up of
3201     // the archived Klasses and Java string objects (at dump time only).
3202     UseBiasedLocking = false;
3203 
3204     // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3205     // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3206     // compiler just to be safe.
3207     //
3208     // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3209     // instead of modifying them in place. The copy is inaccessible to the compiler.
3210     // TODO: revisit the following for the static archive case.
3211     set_mode_flags(_int);
3212   }
3213   if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3214     // Always verify non-system classes during CDS dump
3215     if (!BytecodeVerificationRemote) {
3216       BytecodeVerificationRemote = true;
3217       log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3218     }
3219   }
3220   if (ArchiveClassesAtExit == NULL) {
3221     FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3222   }
3223   if (UseSharedSpaces && patch_mod_javabase) {
3224     no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3225   }
3226   if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3227     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3228   }
3229 #endif
3230 
3231 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3232   UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3233 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3234 
3235   return JNI_OK;
3236 }
3237 
3238 // Helper class for controlling the lifetime of JavaVMInitArgs
3239 // objects.  The contents of the JavaVMInitArgs are guaranteed to be
3240 // deleted on the destruction of the ScopedVMInitArgs object.
3241 class ScopedVMInitArgs : public StackObj {
3242  private:
3243   JavaVMInitArgs _args;
3244   char*          _container_name;
3245   bool           _is_set;
3246   char*          _vm_options_file_arg;
3247 
3248  public:
3249   ScopedVMInitArgs(const char *container_name) {
3250     _args.version = JNI_VERSION_1_2;
3251     _args.nOptions = 0;
3252     _args.options = NULL;
3253     _args.ignoreUnrecognized = false;
3254     _container_name = (char *)container_name;
3255     _is_set = false;
3256     _vm_options_file_arg = NULL;
3257   }
3258 
3259   // Populates the JavaVMInitArgs object represented by this
3260   // ScopedVMInitArgs object with the arguments in options.  The
3261   // allocated memory is deleted by the destructor.  If this method
3262   // returns anything other than JNI_OK, then this object is in a
3263   // partially constructed state, and should be abandoned.
3264   jint set_args(GrowableArray<JavaVMOption>* options) {
3265     _is_set = true;
3266     JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3267         JavaVMOption, options->length(), mtArguments);
3268     if (options_arr == NULL) {
3269       return JNI_ENOMEM;
3270     }
3271     _args.options = options_arr;
3272 
3273     for (int i = 0; i < options->length(); i++) {
3274       options_arr[i] = options->at(i);
3275       options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3276       if (options_arr[i].optionString == NULL) {
3277         // Rely on the destructor to do cleanup.
3278         _args.nOptions = i;
3279         return JNI_ENOMEM;
3280       }
3281     }
3282 
3283     _args.nOptions = options->length();
3284     _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3285     return JNI_OK;
3286   }
3287 
3288   JavaVMInitArgs* get()             { return &_args; }
3289   char* container_name()            { return _container_name; }
3290   bool  is_set()                    { return _is_set; }
3291   bool  found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3292   char* vm_options_file_arg()       { return _vm_options_file_arg; }
3293 
3294   void set_vm_options_file_arg(const char *vm_options_file_arg) {
3295     if (_vm_options_file_arg != NULL) {
3296       os::free(_vm_options_file_arg);
3297     }
3298     _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3299   }
3300 
3301   ~ScopedVMInitArgs() {
3302     if (_vm_options_file_arg != NULL) {
3303       os::free(_vm_options_file_arg);
3304     }
3305     if (_args.options == NULL) return;
3306     for (int i = 0; i < _args.nOptions; i++) {
3307       os::free(_args.options[i].optionString);
3308     }
3309     FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3310   }
3311 
3312   // Insert options into this option list, to replace option at
3313   // vm_options_file_pos (-XX:VMOptionsFile)
3314   jint insert(const JavaVMInitArgs* args,
3315               const JavaVMInitArgs* args_to_insert,
3316               const int vm_options_file_pos) {
3317     assert(_args.options == NULL, "shouldn't be set yet");
3318     assert(args_to_insert->nOptions != 0, "there should be args to insert");
3319     assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3320 
3321     int length = args->nOptions + args_to_insert->nOptions - 1;
3322     GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3323               GrowableArray<JavaVMOption>(length, true);    // Construct new option array
3324     for (int i = 0; i < args->nOptions; i++) {
3325       if (i == vm_options_file_pos) {
3326         // insert the new options starting at the same place as the
3327         // -XX:VMOptionsFile option
3328         for (int j = 0; j < args_to_insert->nOptions; j++) {
3329           options->push(args_to_insert->options[j]);
3330         }
3331       } else {
3332         options->push(args->options[i]);
3333       }
3334     }
3335     // make into options array
3336     jint result = set_args(options);
3337     delete options;
3338     return result;
3339   }
3340 };
3341 
3342 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3343   return parse_options_environment_variable("_JAVA_OPTIONS", args);
3344 }
3345 
3346 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3347   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3348 }
3349 
3350 jint Arguments::parse_options_environment_variable(const char* name,
3351                                                    ScopedVMInitArgs* vm_args) {
3352   char *buffer = ::getenv(name);
3353 
3354   // Don't check this environment variable if user has special privileges
3355   // (e.g. unix su command).
3356   if (buffer == NULL || os::have_special_privileges()) {
3357     return JNI_OK;
3358   }
3359 
3360   if ((buffer = os::strdup(buffer)) == NULL) {
3361     return JNI_ENOMEM;
3362   }
3363 
3364   jio_fprintf(defaultStream::error_stream(),
3365               "Picked up %s: %s\n", name, buffer);
3366 
3367   int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3368 
3369   os::free(buffer);
3370   return retcode;
3371 }
3372 
3373 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3374   // read file into buffer
3375   int fd = ::open(file_name, O_RDONLY);
3376   if (fd < 0) {
3377     jio_fprintf(defaultStream::error_stream(),
3378                 "Could not open options file '%s'\n",
3379                 file_name);
3380     return JNI_ERR;
3381   }
3382 
3383   struct stat stbuf;
3384   int retcode = os::stat(file_name, &stbuf);
3385   if (retcode != 0) {
3386     jio_fprintf(defaultStream::error_stream(),
3387                 "Could not stat options file '%s'\n",
3388                 file_name);
3389     os::close(fd);
3390     return JNI_ERR;
3391   }
3392 
3393   if (stbuf.st_size == 0) {
3394     // tell caller there is no option data and that is ok
3395     os::close(fd);
3396     return JNI_OK;
3397   }
3398 
3399   // '+ 1' for NULL termination even with max bytes
3400   size_t bytes_alloc = stbuf.st_size + 1;
3401 
3402   char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3403   if (NULL == buf) {
3404     jio_fprintf(defaultStream::error_stream(),
3405                 "Could not allocate read buffer for options file parse\n");
3406     os::close(fd);
3407     return JNI_ENOMEM;
3408   }
3409 
3410   memset(buf, 0, bytes_alloc);
3411 
3412   // Fill buffer
3413   ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3414   os::close(fd);
3415   if (bytes_read < 0) {
3416     FREE_C_HEAP_ARRAY(char, buf);
3417     jio_fprintf(defaultStream::error_stream(),
3418                 "Could not read options file '%s'\n", file_name);
3419     return JNI_ERR;
3420   }
3421 
3422   if (bytes_read == 0) {
3423     // tell caller there is no option data and that is ok
3424     FREE_C_HEAP_ARRAY(char, buf);
3425     return JNI_OK;
3426   }
3427 
3428   retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3429 
3430   FREE_C_HEAP_ARRAY(char, buf);
3431   return retcode;
3432 }
3433 
3434 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3435   GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true);    // Construct option array
3436 
3437   // some pointers to help with parsing
3438   char *buffer_end = buffer + buf_len;
3439   char *opt_hd = buffer;
3440   char *wrt = buffer;
3441   char *rd = buffer;
3442 
3443   // parse all options
3444   while (rd < buffer_end) {
3445     // skip leading white space from the input string
3446     while (rd < buffer_end && isspace(*rd)) {
3447       rd++;
3448     }
3449 
3450     if (rd >= buffer_end) {
3451       break;
3452     }
3453 
3454     // Remember this is where we found the head of the token.
3455     opt_hd = wrt;
3456 
3457     // Tokens are strings of non white space characters separated
3458     // by one or more white spaces.
3459     while (rd < buffer_end && !isspace(*rd)) {
3460       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3461         int quote = *rd;                    // matching quote to look for
3462         rd++;                               // don't copy open quote
3463         while (rd < buffer_end && *rd != quote) {
3464                                             // include everything (even spaces)
3465                                             // up until the close quote
3466           *wrt++ = *rd++;                   // copy to option string
3467         }
3468 
3469         if (rd < buffer_end) {
3470           rd++;                             // don't copy close quote
3471         } else {
3472                                             // did not see closing quote
3473           jio_fprintf(defaultStream::error_stream(),
3474                       "Unmatched quote in %s\n", name);
3475           delete options;
3476           return JNI_ERR;
3477         }
3478       } else {
3479         *wrt++ = *rd++;                     // copy to option string
3480       }
3481     }
3482 
3483     // steal a white space character and set it to NULL
3484     *wrt++ = '\0';
3485     // We now have a complete token
3486 
3487     JavaVMOption option;
3488     option.optionString = opt_hd;
3489     option.extraInfo = NULL;
3490 
3491     options->append(option);                // Fill in option
3492 
3493     rd++;  // Advance to next character
3494   }
3495 
3496   // Fill out JavaVMInitArgs structure.
3497   jint status = vm_args->set_args(options);
3498 
3499   delete options;
3500   return status;
3501 }
3502 
3503 void Arguments::set_shared_spaces_flags() {
3504   if (DumpSharedSpaces) {
3505     if (RequireSharedSpaces) {
3506       warning("Cannot dump shared archive while using shared archive");
3507     }
3508     UseSharedSpaces = false;
3509   }
3510 }
3511 
3512 #if INCLUDE_CDS
3513 // Sharing support
3514 // Construct the path to the archive
3515 char* Arguments::get_default_shared_archive_path() {
3516   char *default_archive_path;
3517   char jvm_path[JVM_MAXPATHLEN];
3518   os::jvm_path(jvm_path, sizeof(jvm_path));
3519   char *end = strrchr(jvm_path, *os::file_separator());
3520   if (end != NULL) *end = '\0';
3521   size_t jvm_path_len = strlen(jvm_path);
3522   size_t file_sep_len = strlen(os::file_separator());
3523   const size_t len = jvm_path_len + file_sep_len + 20;
3524   default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3525   jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3526                jvm_path, os::file_separator());
3527   return default_archive_path;
3528 }
3529 
3530 int Arguments::num_archives(const char* archive_path) {
3531   if (archive_path == NULL) {
3532     return 0;
3533   }
3534   int npaths = 1;
3535   char* p = (char*)archive_path;
3536   while (*p != '\0') {
3537     if (*p == os::path_separator()[0]) {
3538       npaths++;
3539     }
3540     p++;
3541   }
3542   return npaths;
3543 }
3544 
3545 void Arguments::extract_shared_archive_paths(const char* archive_path,
3546                                          char** base_archive_path,
3547                                          char** top_archive_path) {
3548   char* begin_ptr = (char*)archive_path;
3549   char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3550   if (end_ptr == NULL || end_ptr == begin_ptr) {
3551     vm_exit_during_initialization("Base archive was not specified", archive_path);
3552   }
3553   size_t len = end_ptr - begin_ptr;
3554   char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3555   strncpy(cur_path, begin_ptr, len);
3556   cur_path[len] = '\0';
3557   FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3558   *base_archive_path = cur_path;
3559 
3560   begin_ptr = ++end_ptr;
3561   if (*begin_ptr == '\0') {
3562     vm_exit_during_initialization("Top archive was not specified", archive_path);
3563   }
3564   end_ptr = strchr(begin_ptr, '\0');
3565   assert(end_ptr != NULL, "sanity");
3566   len = end_ptr - begin_ptr;
3567   cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3568   strncpy(cur_path, begin_ptr, len + 1);
3569   //cur_path[len] = '\0';
3570   FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3571   *top_archive_path = cur_path;
3572 }
3573 
3574 bool Arguments::init_shared_archive_paths() {
3575   if (ArchiveClassesAtExit != NULL) {
3576     if (DumpSharedSpaces) {
3577       vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3578     }
3579     if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3580       return false;
3581     }
3582     check_unsupported_dumping_properties();
3583     SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3584   }
3585   if (SharedArchiveFile == NULL) {
3586     SharedArchivePath = get_default_shared_archive_path();
3587   } else {
3588     int archives = num_archives(SharedArchiveFile);
3589     if (is_dumping_archive()) {
3590       if (archives > 1) {
3591         vm_exit_during_initialization(
3592           "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3593       }
3594       if (DynamicDumpSharedSpaces) {
3595         if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3596           vm_exit_during_initialization(
3597             "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3598             SharedArchiveFile);
3599         }
3600       }
3601     }
3602     if (!is_dumping_archive()){
3603       if (archives > 2) {
3604         vm_exit_during_initialization(
3605           "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3606       }
3607       if (archives == 1) {
3608         char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3609         int name_size;
3610         bool success =
3611           FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3612         if (!success) {
3613           SharedArchivePath = temp_archive_path;
3614         } else {
3615           SharedDynamicArchivePath = temp_archive_path;
3616         }
3617       } else {
3618         extract_shared_archive_paths((const char*)SharedArchiveFile,
3619                                       &SharedArchivePath, &SharedDynamicArchivePath);
3620       }
3621     } else { // CDS dumping
3622       SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3623     }
3624   }
3625   return (SharedArchivePath != NULL);
3626 }
3627 #endif // INCLUDE_CDS
3628 
3629 #ifndef PRODUCT
3630 // Determine whether LogVMOutput should be implicitly turned on.
3631 static bool use_vm_log() {
3632   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3633       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3634       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3635       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3636       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3637     return true;
3638   }
3639 
3640 #ifdef COMPILER1
3641   if (PrintC1Statistics) {
3642     return true;
3643   }
3644 #endif // COMPILER1
3645 
3646 #ifdef COMPILER2
3647   if (PrintOptoAssembly || PrintOptoStatistics) {
3648     return true;
3649   }
3650 #endif // COMPILER2
3651 
3652   return false;
3653 }
3654 
3655 #endif // PRODUCT
3656 
3657 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3658   for (int index = 0; index < args->nOptions; index++) {
3659     const JavaVMOption* option = args->options + index;
3660     const char* tail;
3661     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3662       return true;
3663     }
3664   }
3665   return false;
3666 }
3667 
3668 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3669                                        const char* vm_options_file,
3670                                        const int vm_options_file_pos,
3671                                        ScopedVMInitArgs* vm_options_file_args,
3672                                        ScopedVMInitArgs* args_out) {
3673   jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3674   if (code != JNI_OK) {
3675     return code;
3676   }
3677 
3678   if (vm_options_file_args->get()->nOptions < 1) {
3679     return JNI_OK;
3680   }
3681 
3682   if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3683     jio_fprintf(defaultStream::error_stream(),
3684                 "A VM options file may not refer to a VM options file. "
3685                 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3686                 "options file '%s' in options container '%s' is an error.\n",
3687                 vm_options_file_args->vm_options_file_arg(),
3688                 vm_options_file_args->container_name());
3689     return JNI_EINVAL;
3690   }
3691 
3692   return args_out->insert(args, vm_options_file_args->get(),
3693                           vm_options_file_pos);
3694 }
3695 
3696 // Expand -XX:VMOptionsFile found in args_in as needed.
3697 // mod_args and args_out parameters may return values as needed.
3698 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3699                                             ScopedVMInitArgs* mod_args,
3700                                             JavaVMInitArgs** args_out) {
3701   jint code = match_special_option_and_act(args_in, mod_args);
3702   if (code != JNI_OK) {
3703     return code;
3704   }
3705 
3706   if (mod_args->is_set()) {
3707     // args_in contains -XX:VMOptionsFile and mod_args contains the
3708     // original options from args_in along with the options expanded
3709     // from the VMOptionsFile. Return a short-hand to the caller.
3710     *args_out = mod_args->get();
3711   } else {
3712     *args_out = (JavaVMInitArgs *)args_in;  // no changes so use args_in
3713   }
3714   return JNI_OK;
3715 }
3716 
3717 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3718                                              ScopedVMInitArgs* args_out) {
3719   // Remaining part of option string
3720   const char* tail;
3721   ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3722 
3723   for (int index = 0; index < args->nOptions; index++) {
3724     const JavaVMOption* option = args->options + index;
3725     if (match_option(option, "-XX:Flags=", &tail)) {
3726       Arguments::set_jvm_flags_file(tail);
3727       continue;
3728     }
3729     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3730       if (vm_options_file_args.found_vm_options_file_arg()) {
3731         jio_fprintf(defaultStream::error_stream(),
3732                     "The option '%s' is already specified in the options "
3733                     "container '%s' so the specification of '%s' in the "
3734                     "same options container is an error.\n",
3735                     vm_options_file_args.vm_options_file_arg(),
3736                     vm_options_file_args.container_name(),
3737                     option->optionString);
3738         return JNI_EINVAL;
3739       }
3740       vm_options_file_args.set_vm_options_file_arg(option->optionString);
3741       // If there's a VMOptionsFile, parse that
3742       jint code = insert_vm_options_file(args, tail, index,
3743                                          &vm_options_file_args, args_out);
3744       if (code != JNI_OK) {
3745         return code;
3746       }
3747       args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3748       if (args_out->is_set()) {
3749         // The VMOptions file inserted some options so switch 'args'
3750         // to the new set of options, and continue processing which
3751         // preserves "last option wins" semantics.
3752         args = args_out->get();
3753         // The first option from the VMOptionsFile replaces the
3754         // current option.  So we back track to process the
3755         // replacement option.
3756         index--;
3757       }
3758       continue;
3759     }
3760     if (match_option(option, "-XX:+PrintVMOptions")) {
3761       PrintVMOptions = true;
3762       continue;
3763     }
3764     if (match_option(option, "-XX:-PrintVMOptions")) {
3765       PrintVMOptions = false;
3766       continue;
3767     }
3768     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3769       IgnoreUnrecognizedVMOptions = true;
3770       continue;
3771     }
3772     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3773       IgnoreUnrecognizedVMOptions = false;
3774       continue;
3775     }
3776     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3777       JVMFlag::printFlags(tty, false);
3778       vm_exit(0);
3779     }
3780     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3781 #if INCLUDE_NMT
3782       // The launcher did not setup nmt environment variable properly.
3783       if (!MemTracker::check_launcher_nmt_support(tail)) {
3784         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3785       }
3786 
3787       // Verify if nmt option is valid.
3788       if (MemTracker::verify_nmt_option()) {
3789         // Late initialization, still in single-threaded mode.
3790         if (MemTracker::tracking_level() >= NMT_summary) {
3791           MemTracker::init();
3792         }
3793       } else {
3794         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3795       }
3796       continue;
3797 #else
3798       jio_fprintf(defaultStream::error_stream(),
3799         "Native Memory Tracking is not supported in this VM\n");
3800       return JNI_ERR;
3801 #endif
3802     }
3803 
3804 #ifndef PRODUCT
3805     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3806       JVMFlag::printFlags(tty, true);
3807       vm_exit(0);
3808     }
3809 #endif
3810   }
3811   return JNI_OK;
3812 }
3813 
3814 static void print_options(const JavaVMInitArgs *args) {
3815   const char* tail;
3816   for (int index = 0; index < args->nOptions; index++) {
3817     const JavaVMOption *option = args->options + index;
3818     if (match_option(option, "-XX:", &tail)) {
3819       logOption(tail);
3820     }
3821   }
3822 }
3823 
3824 bool Arguments::handle_deprecated_print_gc_flags() {
3825   if (PrintGC) {
3826     log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3827   }
3828   if (PrintGCDetails) {
3829     log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3830   }
3831 
3832   if (_gc_log_filename != NULL) {
3833     // -Xloggc was used to specify a filename
3834     const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3835 
3836     LogTarget(Error, logging) target;
3837     LogStream errstream(target);
3838     return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3839   } else if (PrintGC || PrintGCDetails) {
3840     LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3841   }
3842   return true;
3843 }
3844 
3845 // Parse entry point called from JNI_CreateJavaVM
3846 
3847 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3848   assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3849 
3850   // Initialize ranges and constraints
3851   JVMFlagRangeList::init();
3852   JVMFlagConstraintList::init();
3853 
3854   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3855   const char* hotspotrc = ".hotspotrc";
3856   bool settings_file_specified = false;
3857   bool needs_hotspotrc_warning = false;
3858   ScopedVMInitArgs initial_vm_options_args("");
3859   ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3860   ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3861 
3862   // Pointers to current working set of containers
3863   JavaVMInitArgs* cur_cmd_args;
3864   JavaVMInitArgs* cur_vm_options_args;
3865   JavaVMInitArgs* cur_java_options_args;
3866   JavaVMInitArgs* cur_java_tool_options_args;
3867 
3868   // Containers for modified/expanded options
3869   ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3870   ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3871   ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3872   ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3873 
3874 
3875   jint code =
3876       parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3877   if (code != JNI_OK) {
3878     return code;
3879   }
3880 
3881   code = parse_java_options_environment_variable(&initial_java_options_args);
3882   if (code != JNI_OK) {
3883     return code;
3884   }
3885 
3886   // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3887   char *vmoptions = ClassLoader::lookup_vm_options();
3888   if (vmoptions != NULL) {
3889     code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3890     FREE_C_HEAP_ARRAY(char, vmoptions);
3891     if (code != JNI_OK) {
3892       return code;
3893     }
3894   }
3895 
3896   code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3897                                      &mod_java_tool_options_args,
3898                                      &cur_java_tool_options_args);
3899   if (code != JNI_OK) {
3900     return code;
3901   }
3902 
3903   code = expand_vm_options_as_needed(initial_cmd_args,
3904                                      &mod_cmd_args,
3905                                      &cur_cmd_args);
3906   if (code != JNI_OK) {
3907     return code;
3908   }
3909 
3910   code = expand_vm_options_as_needed(initial_java_options_args.get(),
3911                                      &mod_java_options_args,
3912                                      &cur_java_options_args);
3913   if (code != JNI_OK) {
3914     return code;
3915   }
3916 
3917   code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3918                                      &mod_vm_options_args,
3919                                      &cur_vm_options_args);
3920   if (code != JNI_OK) {
3921     return code;
3922   }
3923 
3924   const char* flags_file = Arguments::get_jvm_flags_file();
3925   settings_file_specified = (flags_file != NULL);
3926 
3927   if (IgnoreUnrecognizedVMOptions) {
3928     cur_cmd_args->ignoreUnrecognized = true;
3929     cur_java_tool_options_args->ignoreUnrecognized = true;
3930     cur_java_options_args->ignoreUnrecognized = true;
3931   }
3932 
3933   // Parse specified settings file
3934   if (settings_file_specified) {
3935     if (!process_settings_file(flags_file, true,
3936                                cur_cmd_args->ignoreUnrecognized)) {
3937       return JNI_EINVAL;
3938     }
3939   } else {
3940 #ifdef ASSERT
3941     // Parse default .hotspotrc settings file
3942     if (!process_settings_file(".hotspotrc", false,
3943                                cur_cmd_args->ignoreUnrecognized)) {
3944       return JNI_EINVAL;
3945     }
3946 #else
3947     struct stat buf;
3948     if (os::stat(hotspotrc, &buf) == 0) {
3949       needs_hotspotrc_warning = true;
3950     }
3951 #endif
3952   }
3953 
3954   if (PrintVMOptions) {
3955     print_options(cur_java_tool_options_args);
3956     print_options(cur_cmd_args);
3957     print_options(cur_java_options_args);
3958   }
3959 
3960   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3961   jint result = parse_vm_init_args(cur_vm_options_args,
3962                                    cur_java_tool_options_args,
3963                                    cur_java_options_args,
3964                                    cur_cmd_args);
3965 
3966   if (result != JNI_OK) {
3967     return result;
3968   }
3969 
3970 #if INCLUDE_CDS
3971   // Initialize shared archive paths which could include both base and dynamic archive paths
3972   if (!init_shared_archive_paths()) {
3973     return JNI_ENOMEM;
3974   }
3975 #endif
3976 
3977   // Delay warning until here so that we've had a chance to process
3978   // the -XX:-PrintWarnings flag
3979   if (needs_hotspotrc_warning) {
3980     warning("%s file is present but has been ignored.  "
3981             "Run with -XX:Flags=%s to load the file.",
3982             hotspotrc, hotspotrc);
3983   }
3984 
3985   if (needs_module_property_warning) {
3986     warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3987             " names that are reserved for internal use.");
3988   }
3989 
3990 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
3991   UNSUPPORTED_OPTION(UseLargePages);
3992 #endif
3993 
3994 #if defined(AIX)
3995   UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3996   UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3997 #endif
3998 
3999 #ifndef PRODUCT
4000   if (TraceBytecodesAt != 0) {
4001     TraceBytecodes = true;
4002   }
4003   if (CountCompiledCalls) {
4004     if (UseCounterDecay) {
4005       warning("UseCounterDecay disabled because CountCalls is set");
4006       UseCounterDecay = false;
4007     }
4008   }
4009 #endif // PRODUCT
4010 
4011   if (ScavengeRootsInCode == 0) {
4012     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4013       warning("Forcing ScavengeRootsInCode non-zero");
4014     }
4015     ScavengeRootsInCode = 1;
4016   }
4017 
4018   if (!handle_deprecated_print_gc_flags()) {
4019     return JNI_EINVAL;
4020   }
4021 
4022   // Set object alignment values.
4023   set_object_alignment();
4024 
4025 #if !INCLUDE_CDS
4026   if (DumpSharedSpaces || RequireSharedSpaces) {
4027     jio_fprintf(defaultStream::error_stream(),
4028       "Shared spaces are not supported in this VM\n");
4029     return JNI_ERR;
4030   }
4031   if (DumpLoadedClassList != NULL) {
4032     jio_fprintf(defaultStream::error_stream(),
4033       "DumpLoadedClassList is not supported in this VM\n");
4034     return JNI_ERR;
4035   }
4036   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4037       log_is_enabled(Info, cds)) {
4038     warning("Shared spaces are not supported in this VM");
4039     FLAG_SET_DEFAULT(UseSharedSpaces, false);
4040     LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4041   }
4042   no_shared_spaces("CDS Disabled");
4043 #endif // INCLUDE_CDS
4044 
4045 #ifndef TIERED
4046   if (FLAG_IS_CMDLINE(CompilationMode)) {
4047     warning("CompilationMode has no effect in non-tiered VMs");
4048   }
4049 #endif
4050 
4051   return JNI_OK;
4052 }
4053 
4054 jint Arguments::apply_ergo() {
4055   // Set flags based on ergonomics.
4056   jint result = set_ergonomics_flags();
4057   if (result != JNI_OK) return result;
4058 
4059   // Set heap size based on available physical memory
4060   set_heap_size();
4061 
4062   GCConfig::arguments()->initialize();
4063 
4064   set_shared_spaces_flags();
4065 
4066   // Initialize Metaspace flags and alignments
4067   Metaspace::ergo_initialize();
4068 
4069   // Set compiler flags after GC is selected and GC specific
4070   // flags (LoopStripMiningIter) are set.
4071   CompilerConfig::ergo_initialize();
4072 
4073   // Set bytecode rewriting flags
4074   set_bytecode_flags();
4075 
4076   // Set flags if aggressive optimization flags are enabled
4077   jint code = set_aggressive_opts_flags();
4078   if (code != JNI_OK) {
4079     return code;
4080   }
4081 
4082   // Turn off biased locking for locking debug mode flags,
4083   // which are subtly different from each other but neither works with
4084   // biased locking
4085   if (UseHeavyMonitors
4086 #ifdef COMPILER1
4087       || !UseFastLocking
4088 #endif // COMPILER1
4089 #if INCLUDE_JVMCI
4090       || !JVMCIUseFastLocking
4091 #endif
4092     ) {
4093     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4094       // flag set to true on command line; warn the user that they
4095       // can't enable biased locking here
4096       warning("Biased Locking is not supported with locking debug flags"
4097               "; ignoring UseBiasedLocking flag." );
4098     }
4099     UseBiasedLocking = false;
4100   }
4101 
4102 #ifdef CC_INTERP
4103   // Clear flags not supported on zero.
4104   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4105   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4106   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4107   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4108 #endif // CC_INTERP
4109 
4110   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4111     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4112     DebugNonSafepoints = true;
4113   }
4114 
4115   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4116     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4117   }
4118 
4119   // Treat the odd case where local verification is enabled but remote
4120   // verification is not as if both were enabled.
4121   if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4122     log_info(verification)("Turning on remote verification because local verification is on");
4123     FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4124   }
4125 
4126 #ifndef PRODUCT
4127   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4128     if (use_vm_log()) {
4129       LogVMOutput = true;
4130     }
4131   }
4132 #endif // PRODUCT
4133 
4134   if (PrintCommandLineFlags) {
4135     JVMFlag::printSetFlags(tty);
4136   }
4137 
4138   // Apply CPU specific policy for the BiasedLocking
4139   if (UseBiasedLocking) {
4140     if (!VM_Version::use_biased_locking() &&
4141         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4142       UseBiasedLocking = false;
4143     }
4144   }
4145 #ifdef COMPILER2
4146   if (!UseBiasedLocking) {
4147     UseOptoBiasInlining = false;
4148   }
4149 #endif
4150 
4151   return JNI_OK;
4152 }
4153 
4154 jint Arguments::adjust_after_os() {
4155   if (UseNUMA) {
4156     if (UseParallelGC) {
4157       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4158          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4159       }
4160     }
4161     // UseNUMAInterleaving is set to ON for all collectors and platforms when
4162     // UseNUMA is set to ON. NUMA-aware collectors will interleave old gen and
4163     // survivor spaces on top of NUMA allocation policy for the eden space.
4164     // Non NUMA-aware collectors will interleave all of the heap spaces across
4165     // NUMA nodes.
4166     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4167       FLAG_SET_ERGO(UseNUMAInterleaving, true);
4168     }
4169   }
4170   return JNI_OK;
4171 }
4172 
4173 int Arguments::PropertyList_count(SystemProperty* pl) {
4174   int count = 0;
4175   while(pl != NULL) {
4176     count++;
4177     pl = pl->next();
4178   }
4179   return count;
4180 }
4181 
4182 // Return the number of readable properties.
4183 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4184   int count = 0;
4185   while(pl != NULL) {
4186     if (pl->is_readable()) {
4187       count++;
4188     }
4189     pl = pl->next();
4190   }
4191   return count;
4192 }
4193 
4194 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4195   assert(key != NULL, "just checking");
4196   SystemProperty* prop;
4197   for (prop = pl; prop != NULL; prop = prop->next()) {
4198     if (strcmp(key, prop->key()) == 0) return prop->value();
4199   }
4200   return NULL;
4201 }
4202 
4203 // Return the value of the requested property provided that it is a readable property.
4204 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4205   assert(key != NULL, "just checking");
4206   SystemProperty* prop;
4207   // Return the property value if the keys match and the property is not internal or
4208   // it's the special internal property "jdk.boot.class.path.append".
4209   for (prop = pl; prop != NULL; prop = prop->next()) {
4210     if (strcmp(key, prop->key()) == 0) {
4211       if (!prop->internal()) {
4212         return prop->value();
4213       } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4214         return prop->value();
4215       } else {
4216         // Property is internal and not jdk.boot.class.path.append so return NULL.
4217         return NULL;
4218       }
4219     }
4220   }
4221   return NULL;
4222 }
4223 
4224 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4225   int count = 0;
4226   const char* ret_val = NULL;
4227 
4228   while(pl != NULL) {
4229     if(count >= index) {
4230       ret_val = pl->key();
4231       break;
4232     }
4233     count++;
4234     pl = pl->next();
4235   }
4236 
4237   return ret_val;
4238 }
4239 
4240 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4241   int count = 0;
4242   char* ret_val = NULL;
4243 
4244   while(pl != NULL) {
4245     if(count >= index) {
4246       ret_val = pl->value();
4247       break;
4248     }
4249     count++;
4250     pl = pl->next();
4251   }
4252 
4253   return ret_val;
4254 }
4255 
4256 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4257   SystemProperty* p = *plist;
4258   if (p == NULL) {
4259     *plist = new_p;
4260   } else {
4261     while (p->next() != NULL) {
4262       p = p->next();
4263     }
4264     p->set_next(new_p);
4265   }
4266 }
4267 
4268 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4269                                  bool writeable, bool internal) {
4270   if (plist == NULL)
4271     return;
4272 
4273   SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4274   PropertyList_add(plist, new_p);
4275 }
4276 
4277 void Arguments::PropertyList_add(SystemProperty *element) {
4278   PropertyList_add(&_system_properties, element);
4279 }
4280 
4281 // This add maintains unique property key in the list.
4282 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4283                                         PropertyAppendable append, PropertyWriteable writeable,
4284                                         PropertyInternal internal) {
4285   if (plist == NULL)
4286     return;
4287 
4288   // If property key exist then update with new value.
4289   SystemProperty* prop;
4290   for (prop = *plist; prop != NULL; prop = prop->next()) {
4291     if (strcmp(k, prop->key()) == 0) {
4292       if (append == AppendProperty) {
4293         prop->append_value(v);
4294       } else {
4295         prop->set_value(v);
4296       }
4297       return;
4298     }
4299   }
4300 
4301   PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4302 }
4303 
4304 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4305 // Returns true if all of the source pointed by src has been copied over to
4306 // the destination buffer pointed by buf. Otherwise, returns false.
4307 // Notes:
4308 // 1. If the length (buflen) of the destination buffer excluding the
4309 // NULL terminator character is not long enough for holding the expanded
4310 // pid characters, it also returns false instead of returning the partially
4311 // expanded one.
4312 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4313 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4314                                 char* buf, size_t buflen) {
4315   const char* p = src;
4316   char* b = buf;
4317   const char* src_end = &src[srclen];
4318   char* buf_end = &buf[buflen - 1];
4319 
4320   while (p < src_end && b < buf_end) {
4321     if (*p == '%') {
4322       switch (*(++p)) {
4323       case '%':         // "%%" ==> "%"
4324         *b++ = *p++;
4325         break;
4326       case 'p':  {       //  "%p" ==> current process id
4327         // buf_end points to the character before the last character so
4328         // that we could write '\0' to the end of the buffer.
4329         size_t buf_sz = buf_end - b + 1;
4330         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4331 
4332         // if jio_snprintf fails or the buffer is not long enough to hold
4333         // the expanded pid, returns false.
4334         if (ret < 0 || ret >= (int)buf_sz) {
4335           return false;
4336         } else {
4337           b += ret;
4338           assert(*b == '\0', "fail in copy_expand_pid");
4339           if (p == src_end && b == buf_end + 1) {
4340             // reach the end of the buffer.
4341             return true;
4342           }
4343         }
4344         p++;
4345         break;
4346       }
4347       default :
4348         *b++ = '%';
4349       }
4350     } else {
4351       *b++ = *p++;
4352     }
4353   }
4354   *b = '\0';
4355   return (p == src_end); // return false if not all of the source was copied
4356 }