1 /*
   2  * Copyright (c) 1997, 2024, 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 "cds/cds_globals.hpp"
  27 #include "cds/cdsConfig.hpp"
  28 #include "cds/filemap.hpp"

  29 #include "classfile/classLoader.hpp"
  30 #include "classfile/javaAssertions.hpp"
  31 #include "classfile/moduleEntry.hpp"
  32 #include "classfile/stringTable.hpp"
  33 #include "classfile/symbolTable.hpp"
  34 #include "compiler/compilerDefinitions.hpp"
  35 #include "gc/shared/gcArguments.hpp"
  36 #include "gc/shared/gcConfig.hpp"
  37 #include "gc/shared/genArguments.hpp"
  38 #include "gc/shared/stringdedup/stringDedup.hpp"
  39 #include "gc/shared/tlab_globals.hpp"
  40 #include "jvm.h"
  41 #include "logging/log.hpp"
  42 #include "logging/logConfiguration.hpp"
  43 #include "logging/logStream.hpp"
  44 #include "logging/logTag.hpp"
  45 #include "memory/allocation.inline.hpp"
  46 #include "nmt/nmtCommon.hpp"
  47 #include "oops/compressedKlass.hpp"
  48 #include "oops/instanceKlass.hpp"
  49 #include "oops/objLayout.hpp"
  50 #include "oops/oop.inline.hpp"
  51 #include "prims/jvmtiAgentList.hpp"
  52 #include "prims/jvmtiExport.hpp"
  53 #include "runtime/arguments.hpp"
  54 #include "runtime/flags/jvmFlag.hpp"
  55 #include "runtime/flags/jvmFlagAccess.hpp"
  56 #include "runtime/flags/jvmFlagLimit.hpp"
  57 #include "runtime/globals_extension.hpp"
  58 #include "runtime/java.hpp"
  59 #include "runtime/os.hpp"
  60 #include "runtime/safepoint.hpp"
  61 #include "runtime/safepointMechanism.hpp"
  62 #include "runtime/synchronizer.hpp"
  63 #include "runtime/vm_version.hpp"
  64 #include "services/management.hpp"
  65 #include "utilities/align.hpp"
  66 #include "utilities/checkedCast.hpp"
  67 #include "utilities/debug.hpp"
  68 #include "utilities/defaultStream.hpp"
  69 #include "utilities/macros.hpp"
  70 #include "utilities/parseInteger.hpp"
  71 #include "utilities/powerOfTwo.hpp"
  72 #include "utilities/stringUtils.hpp"
  73 #include "utilities/systemMemoryBarrier.hpp"
  74 #if INCLUDE_JFR
  75 #include "jfr/jfr.hpp"
  76 #endif
  77 
  78 #include <limits>
  79 
  80 static const char _default_java_launcher[] = "generic";
  81 
  82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
  83 
  84 char*  Arguments::_jvm_flags_file               = nullptr;
  85 char** Arguments::_jvm_flags_array              = nullptr;
  86 int    Arguments::_num_jvm_flags                = 0;
  87 char** Arguments::_jvm_args_array               = nullptr;
  88 int    Arguments::_num_jvm_args                 = 0;
  89 unsigned int Arguments::_addmods_count          = 0;
  90 char*  Arguments::_java_command                 = nullptr;
  91 SystemProperty* Arguments::_system_properties   = nullptr;
  92 size_t Arguments::_conservative_max_heap_alignment = 0;
  93 Arguments::Mode Arguments::_mode                = _mixed;
  94 const char*  Arguments::_java_vendor_url_bug    = nullptr;
  95 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  96 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
  97 
  98 // These parameters are reset in method parse_vm_init_args()
  99 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 100 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 101 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 102 bool   Arguments::_ClipInlining                 = ClipInlining;
 103 size_t Arguments::_default_SharedBaseAddress    = SharedBaseAddress;
 104 
 105 bool   Arguments::_enable_preview               = false;
 106 
 107 LegacyGCLogging Arguments::_legacyGCLogging     = { nullptr, 0 };
 108 
 109 // These are not set by the JDK's built-in launchers, but they can be set by
 110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
 111 // JavaVMOption in jni.h.
 112 abort_hook_t     Arguments::_abort_hook         = nullptr;
 113 exit_hook_t      Arguments::_exit_hook          = nullptr;
 114 vfprintf_hook_t  Arguments::_vfprintf_hook      = nullptr;
 115 
 116 
 117 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
 118 SystemProperty *Arguments::_java_library_path = nullptr;
 119 SystemProperty *Arguments::_java_home = nullptr;
 120 SystemProperty *Arguments::_java_class_path = nullptr;
 121 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
 122 SystemProperty *Arguments::_vm_info = nullptr;
 123 
 124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
 125 PathString *Arguments::_boot_class_path = nullptr;
 126 bool Arguments::_has_jimage = false;
 127 
 128 char* Arguments::_ext_dirs = nullptr;
 129 
 130 // True if -Xshare:auto option was specified.
 131 static bool xshare_auto_cmd_line = false;
 132 
 133 // True if -Xint/-Xmixed/-Xcomp were specified
 134 static bool mode_flag_cmd_line = false;
 135 
 136 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
 137   char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
 138   if (new_value == nullptr) {
 139     assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
 140     return false;
 141   }
 142   if (_value != nullptr) {
 143     FreeHeap(_value);
 144   }
 145   _value = new_value;
 146   strcpy(_value, value);
 147   return true;
 148 }
 149 
 150 void PathString::append_value(const char *value) {
 151   char *sp;
 152   size_t len = 0;
 153   if (value != nullptr) {
 154     len = strlen(value);
 155     if (_value != nullptr) {
 156       len += strlen(_value);
 157     }
 158     sp = AllocateHeap(len+2, mtArguments);
 159     assert(sp != nullptr, "Unable to allocate space for new append path value");
 160     if (sp != nullptr) {
 161       if (_value != nullptr) {
 162         strcpy(sp, _value);
 163         strcat(sp, os::path_separator());
 164         strcat(sp, value);
 165         FreeHeap(_value);
 166       } else {
 167         strcpy(sp, value);
 168       }
 169       _value = sp;
 170     }
 171   }
 172 }
 173 
 174 PathString::PathString(const char* value) {
 175   if (value == nullptr) {
 176     _value = nullptr;
 177   } else {
 178     _value = AllocateHeap(strlen(value)+1, mtArguments);
 179     strcpy(_value, value);
 180   }
 181 }
 182 
 183 PathString::~PathString() {
 184   if (_value != nullptr) {
 185     FreeHeap(_value);
 186     _value = nullptr;
 187   }
 188 }
 189 
 190 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
 191   assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
 192   size_t len = strlen(module_name) + 1;
 193   _module_name = AllocateHeap(len, mtInternal);
 194   strncpy(_module_name, module_name, len); // copy the trailing null
 195   _path =  new PathString(path);
 196 }
 197 
 198 ModulePatchPath::~ModulePatchPath() {
 199   if (_module_name != nullptr) {
 200     FreeHeap(_module_name);
 201     _module_name = nullptr;
 202   }
 203   if (_path != nullptr) {
 204     delete _path;
 205     _path = nullptr;
 206   }
 207 }
 208 
 209 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
 210   if (key == nullptr) {
 211     _key = nullptr;
 212   } else {
 213     _key = AllocateHeap(strlen(key)+1, mtArguments);
 214     strcpy(_key, key);
 215   }
 216   _next = nullptr;
 217   _internal = internal;
 218   _writeable = writeable;
 219 }
 220 
 221 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 222 // part of the option string.
 223 static bool match_option(const JavaVMOption *option, const char* name,
 224                          const char** tail) {
 225   size_t len = strlen(name);
 226   if (strncmp(option->optionString, name, len) == 0) {
 227     *tail = option->optionString + len;
 228     return true;
 229   } else {
 230     return false;
 231   }
 232 }
 233 
 234 // Check if 'option' matches 'name'. No "tail" is allowed.
 235 static bool match_option(const JavaVMOption *option, const char* name) {
 236   const char* tail = nullptr;
 237   bool result = match_option(option, name, &tail);
 238   if (tail != nullptr && *tail == '\0') {
 239     return result;
 240   } else {
 241     return false;
 242   }
 243 }
 244 
 245 // Return true if any of the strings in null-terminated array 'names' matches.
 246 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 247 // the option must match exactly.
 248 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 249   bool tail_allowed) {
 250   for (/* empty */; *names != nullptr; ++names) {
 251   if (match_option(option, *names, tail)) {
 252       if (**tail == '\0' || (tail_allowed && **tail == ':')) {
 253         return true;
 254       }
 255     }
 256   }
 257   return false;
 258 }
 259 
 260 #if INCLUDE_JFR
 261 static bool _has_jfr_option = false;  // is using JFR
 262 
 263 // return true on failure
 264 static bool match_jfr_option(const JavaVMOption** option) {
 265   assert((*option)->optionString != nullptr, "invariant");
 266   char* tail = nullptr;
 267   if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
 268     _has_jfr_option = true;
 269     return Jfr::on_start_flight_recording_option(option, tail);
 270   } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
 271     _has_jfr_option = true;
 272     return Jfr::on_flight_recorder_option(option, tail);
 273   }
 274   return false;
 275 }
 276 
 277 bool Arguments::has_jfr_option() {
 278   return _has_jfr_option;
 279 }
 280 #endif
 281 
 282 static void logOption(const char* opt) {
 283   if (PrintVMOptions) {
 284     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 285   }
 286 }
 287 
 288 bool needs_module_property_warning = false;
 289 
 290 #define MODULE_PROPERTY_PREFIX "jdk.module."
 291 #define MODULE_PROPERTY_PREFIX_LEN 11
 292 #define ADDEXPORTS "addexports"
 293 #define ADDEXPORTS_LEN 10
 294 #define ADDREADS "addreads"
 295 #define ADDREADS_LEN 8
 296 #define ADDOPENS "addopens"
 297 #define ADDOPENS_LEN 8
 298 #define PATCH "patch"
 299 #define PATCH_LEN 5
 300 #define ADDMODS "addmods"
 301 #define ADDMODS_LEN 7
 302 #define LIMITMODS "limitmods"
 303 #define LIMITMODS_LEN 9
 304 #define PATH "path"
 305 #define PATH_LEN 4
 306 #define UPGRADE_PATH "upgrade.path"
 307 #define UPGRADE_PATH_LEN 12
 308 #define ENABLE_NATIVE_ACCESS "enable.native.access"
 309 #define ENABLE_NATIVE_ACCESS_LEN 20
 310 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
 311 #define ILLEGAL_NATIVE_ACCESS_LEN 21
 312 
 313 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
 314 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
 315   return ((strncmp(option, property, len) == 0) &&
 316           (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
 317 }
 318 
 319 // Return true if property starts with "jdk.module." and its ensuing chars match
 320 // any of the reserved module properties.
 321 // property should be passed without the leading "-D".
 322 bool Arguments::is_internal_module_property(const char* property) {
 323   if  (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
 324     const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
 325     if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
 326         matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
 327         matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
 328         matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
 329         matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
 330         matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
 331         matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
 332         matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
 333         matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN) ||
 334         matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
 335       return true;
 336     }
 337   }
 338   return false;
 339 }
 340 
 341 bool Arguments::is_add_modules_property(const char* key) {
 342   return (strcmp(key, MODULE_PROPERTY_PREFIX ADDMODS) == 0);
 343 }
 344 
 345 // Return true if the key matches the --module-path property name ("jdk.module.path").
 346 bool Arguments::is_module_path_property(const char* key) {
 347   return (strcmp(key, MODULE_PROPERTY_PREFIX PATH) == 0);
 348 }
 349 
 350 // Process java launcher properties.
 351 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 352   // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
 353   // Must do this before setting up other system properties,
 354   // as some of them may depend on launcher type.
 355   for (int index = 0; index < args->nOptions; index++) {
 356     const JavaVMOption* option = args->options + index;
 357     const char* tail;
 358 
 359     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 360       process_java_launcher_argument(tail, option->extraInfo);
 361       continue;
 362     }
 363     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 364       if (strcmp(tail, "true") == 0) {
 365         _sun_java_launcher_is_altjvm = true;
 366       }
 367       continue;
 368     }
 369   }
 370 }
 371 
 372 // Initialize system properties key and value.
 373 void Arguments::init_system_properties() {
 374 
 375   // Set up _boot_class_path which is not a property but
 376   // relies heavily on argument processing and the jdk.boot.class.path.append
 377   // property. It is used to store the underlying boot class path.
 378   _boot_class_path = new PathString(nullptr);
 379 
 380   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 381                                                            "Java Virtual Machine Specification",  false));
 382   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 383   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 384   PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(),  false));
 385 
 386   // Initialize the vm.info now, but it will need updating after argument parsing.
 387   _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
 388 
 389   // Following are JVMTI agent writable properties.
 390   // Properties values are set to nullptr and they are
 391   // os specific they are initialized in os::init_system_properties_values().
 392   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr,  true);
 393   _java_library_path = new SystemProperty("java.library.path", nullptr,  true);
 394   _java_home =  new SystemProperty("java.home", nullptr,  true);
 395   _java_class_path = new SystemProperty("java.class.path", "",  true);
 396   // jdk.boot.class.path.append is a non-writeable, internal property.
 397   // It can only be set by either:
 398   //    - -Xbootclasspath/a:
 399   //    - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
 400   _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
 401 
 402   // Add to System Property list.
 403   PropertyList_add(&_system_properties, _sun_boot_library_path);
 404   PropertyList_add(&_system_properties, _java_library_path);
 405   PropertyList_add(&_system_properties, _java_home);
 406   PropertyList_add(&_system_properties, _java_class_path);
 407   PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
 408   PropertyList_add(&_system_properties, _vm_info);
 409 
 410   // Set OS specific system properties values
 411   os::init_system_properties_values();
 412 }
 413 
 414 // Update/Initialize System properties after JDK version number is known
 415 void Arguments::init_version_specific_system_properties() {
 416   enum { bufsz = 16 };
 417   char buffer[bufsz];
 418   const char* spec_vendor = "Oracle Corporation";
 419   uint32_t spec_version = JDK_Version::current().major_version();
 420 
 421   jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
 422 
 423   PropertyList_add(&_system_properties,
 424       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 425   PropertyList_add(&_system_properties,
 426       new SystemProperty("java.vm.specification.version", buffer, false));
 427   PropertyList_add(&_system_properties,
 428       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 429 }
 430 
 431 /*
 432  *  -XX argument processing:
 433  *
 434  *  -XX arguments are defined in several places, such as:
 435  *      globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
 436  *  -XX arguments are parsed in parse_argument().
 437  *  -XX argument bounds checking is done in check_vm_args_consistency().
 438  *
 439  * Over time -XX arguments may change. There are mechanisms to handle common cases:
 440  *
 441  *      ALIASED: An option that is simply another name for another option. This is often
 442  *               part of the process of deprecating a flag, but not all aliases need
 443  *               to be deprecated.
 444  *
 445  *               Create an alias for an option by adding the old and new option names to the
 446  *               "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
 447  *
 448  *   DEPRECATED: An option that is supported, but a warning is printed to let the user know that
 449  *               support may be removed in the future. Both regular and aliased options may be
 450  *               deprecated.
 451  *
 452  *               Add a deprecation warning for an option (or alias) by adding an entry in the
 453  *               "special_jvm_flags" table and setting the "deprecated_in" field.
 454  *               Often an option "deprecated" in one major release will
 455  *               be made "obsolete" in the next. In this case the entry should also have its
 456  *               "obsolete_in" field set.
 457  *
 458  *     OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
 459  *               on the command line. A warning is printed to let the user know that option might not
 460  *               be accepted in the future.
 461  *
 462  *               Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
 463  *               table and setting the "obsolete_in" field.
 464  *
 465  *      EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
 466  *               to the current JDK version. The system will flatly refuse to admit the existence of
 467  *               the flag. This allows a flag to die automatically over JDK releases.
 468  *
 469  *               Note that manual cleanup of expired options should be done at major JDK version upgrades:
 470  *                  - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
 471  *                  - Newly obsolete or expired deprecated options should have their global variable
 472  *                    definitions removed (from globals.hpp, etc) and related implementations removed.
 473  *
 474  * Recommended approach for removing options:
 475  *
 476  * To remove options commonly used by customers (e.g. product -XX options), use
 477  * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
 478  *
 479  * To remove internal options (e.g. diagnostic, experimental, develop options), use
 480  * a 2-step model adding major release numbers to the obsolete and expire columns.
 481  *
 482  * To change the name of an option, use the alias table as well as a 2-step
 483  * model adding major release numbers to the deprecate and expire columns.
 484  * Think twice about aliasing commonly used customer options.
 485  *
 486  * There are times when it is appropriate to leave a future release number as undefined.
 487  *
 488  * Tests:  Aliases should be tested in VMAliasOptions.java.
 489  *         Deprecated options should be tested in VMDeprecatedOptions.java.
 490  */
 491 
 492 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
 493 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
 494 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
 495 // the command-line as usual, but will issue a warning.
 496 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
 497 // the command-line, while issuing a warning and ignoring the flag value.
 498 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
 499 // existence of the flag.
 500 //
 501 // MANUAL CLEANUP ON JDK VERSION UPDATES:
 502 // This table ensures that the handling of options will update automatically when the JDK
 503 // version is incremented, but the source code needs to be cleanup up manually:
 504 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
 505 //   variable should be removed, as well as users of the variable.
 506 // - As "deprecated" options age into "obsolete" options, move the entry into the
 507 //   "Obsolete Flags" section of the table.
 508 // - All expired options should be removed from the table.
 509 static SpecialFlag const special_jvm_flags[] = {
 510   // -------------- Deprecated Flags --------------
 511   // --- Non-alias flags - sorted by obsolete_in then expired_in:
 512   { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
 513   { "FlightRecorder",               JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
 514   { "DumpSharedSpaces",             JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
 515   { "DynamicDumpSharedSpaces",      JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
 516   { "RequireSharedSpaces",          JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
 517   { "UseSharedSpaces",              JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
 518   { "DontYieldALot",                JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 519 #ifdef LINUX
 520   { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) },
 521 #endif
 522   { "LockingMode",                  JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
 523   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
 524   { "CreateMinidumpOnCrash",        JDK_Version::jdk(9),  JDK_Version::undefined(), JDK_Version::undefined() },
 525 
 526   // -------------- Obsolete Flags - sorted by expired_in --------------
 527 
 528   { "MetaspaceReclaimPolicy",       JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
 529   { "ZGenerational",                JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
 530   { "UseNotificationThread",        JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 531   { "PreserveAllAnnotations",       JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 532   { "UseEmptySlotsInSupers",        JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 533   { "OldSize",                      JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 534 #if defined(X86)
 535   { "UseRTMLocking",                JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 536   { "UseRTMDeopt",                  JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 537   { "RTMRetryCount",                JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 538 #endif // X86
 539 
 540 
 541   { "BaseFootPrintEstimate",           JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 542   { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 543   { "UseVtableBasedCHA",               JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },
 544 #ifdef ASSERT
 545   { "DummyObsoleteTestFlag",        JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
 546 #endif
 547 
 548 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
 549   // These entries will generate build errors.  Their purpose is to test the macros.
 550   { "dep > obs",                    JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
 551   { "dep > exp ",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
 552   { "obs > exp ",                   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
 553   { "obs > exp",                    JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
 554   { "not deprecated or obsolete",   JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
 555   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 556   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 557 #endif
 558 
 559   { nullptr, JDK_Version(0), JDK_Version(0) }
 560 };
 561 
 562 // Flags that are aliases for other flags.
 563 typedef struct {
 564   const char* alias_name;
 565   const char* real_name;
 566 } AliasedFlag;
 567 
 568 static AliasedFlag const aliased_jvm_flags[] = {
 569   { "CreateMinidumpOnCrash",    "CreateCoredumpOnCrash" },
 570   { nullptr, nullptr}
 571 };
 572 
 573 // Return true if "v" is less than "other", where "other" may be "undefined".
 574 static bool version_less_than(JDK_Version v, JDK_Version other) {
 575   assert(!v.is_undefined(), "must be defined");
 576   if (!other.is_undefined() && v.compare(other) >= 0) {
 577     return false;
 578   } else {
 579     return true;
 580   }
 581 }
 582 
 583 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
 584   for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
 585     if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 586       flag = special_jvm_flags[i];
 587       return true;
 588     }
 589   }
 590   return false;
 591 }
 592 
 593 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
 594   assert(version != nullptr, "Must provide a version buffer");
 595   SpecialFlag flag;
 596   if (lookup_special_flag(flag_name, flag)) {
 597     if (!flag.obsolete_in.is_undefined()) {
 598       if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 599         *version = flag.obsolete_in;
 600         // This flag may have been marked for obsoletion in this version, but we may not
 601         // have actually removed it yet. Rather than ignoring it as soon as we reach
 602         // this version we allow some time for the removal to happen. So if the flag
 603         // still actually exists we process it as normal, but issue an adjusted warning.
 604         const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
 605         if (real_flag != nullptr) {
 606           char version_str[256];
 607           version->to_string(version_str, sizeof(version_str));
 608           warning("Temporarily processing option %s; support is scheduled for removal in %s",
 609                   flag_name, version_str);
 610           return false;
 611         }
 612         return true;
 613       }
 614     }
 615   }
 616   return false;
 617 }
 618 
 619 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
 620   assert(version != nullptr, "Must provide a version buffer");
 621   SpecialFlag flag;
 622   if (lookup_special_flag(flag_name, flag)) {
 623     if (!flag.deprecated_in.is_undefined()) {
 624       if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
 625           version_less_than(JDK_Version::current(), flag.expired_in)) {
 626         *version = flag.deprecated_in;
 627         return 1;
 628       } else {
 629         return -1;
 630       }
 631     }
 632   }
 633   return 0;
 634 }
 635 
 636 const char* Arguments::real_flag_name(const char *flag_name) {
 637   for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
 638     const AliasedFlag& flag_status = aliased_jvm_flags[i];
 639     if (strcmp(flag_status.alias_name, flag_name) == 0) {
 640         return flag_status.real_name;
 641     }
 642   }
 643   return flag_name;
 644 }
 645 
 646 #ifdef ASSERT
 647 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
 648   for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
 649     if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 650       return true;
 651     }
 652   }
 653   return false;
 654 }
 655 
 656 // Verifies the correctness of the entries in the special_jvm_flags table.
 657 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
 658 // version being earlier than the deprecation version, then a warning is issued
 659 // and verification fails - by returning false. If it is detected that the table
 660 // is out of date, with respect to the current version, then ideally a warning is
 661 // issued but verification does not fail. This allows the VM to operate when the
 662 // version is first updated, without needing to update all the impacted flags at
 663 // the same time. In practice we can't issue the warning immediately when the version
 664 // is updated as it occurs for every test and some tests are not prepared to handle
 665 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
 666 // if the check_globals flag is true, and in addition allow a grace period and only
 667 // check for stale flags when we hit build 25 (which is far enough into the 6 month
 668 // release cycle that all flag updates should have been processed, whilst still
 669 // leaving time to make the change before RDP2).
 670 // We use a gtest to call this, passing true, so that we can detect stale flags before
 671 // the end of the release cycle.
 672 
 673 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
 674 
 675 bool Arguments::verify_special_jvm_flags(bool check_globals) {
 676   bool success = true;
 677   for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
 678     const SpecialFlag& flag = special_jvm_flags[i];
 679     if (lookup_special_flag(flag.name, i)) {
 680       warning("Duplicate special flag declaration \"%s\"", flag.name);
 681       success = false;
 682     }
 683     if (flag.deprecated_in.is_undefined() &&
 684         flag.obsolete_in.is_undefined()) {
 685       warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
 686       success = false;
 687     }
 688 
 689     if (!flag.deprecated_in.is_undefined()) {
 690       if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
 691         warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
 692         success = false;
 693       }
 694 
 695       if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
 696         warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
 697         success = false;
 698       }
 699     }
 700 
 701     if (!flag.obsolete_in.is_undefined()) {
 702       if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
 703         warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
 704         success = false;
 705       }
 706 
 707       // if flag has become obsolete it should not have a "globals" flag defined anymore.
 708       if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
 709           !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 710         if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
 711           warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
 712           success = false;
 713         }
 714       }
 715 
 716     } else if (!flag.expired_in.is_undefined()) {
 717       warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
 718       success = false;
 719     }
 720 
 721     if (!flag.expired_in.is_undefined()) {
 722       // if flag has become expired it should not have a "globals" flag defined anymore.
 723       if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
 724           !version_less_than(JDK_Version::current(), flag.expired_in)) {
 725         if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
 726           warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
 727           success = false;
 728         }
 729       }
 730     }
 731   }
 732   return success;
 733 }
 734 #endif
 735 
 736 bool Arguments::atojulong(const char *s, julong* result) {
 737   return parse_integer(s, result);
 738 }
 739 
 740 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
 741   if (size < min_size) return arg_too_small;
 742   if (size > max_size) return arg_too_big;
 743   return arg_in_range;
 744 }
 745 
 746 // Describe an argument out of range error
 747 void Arguments::describe_range_error(ArgsRange errcode) {
 748   switch(errcode) {
 749   case arg_too_big:
 750     jio_fprintf(defaultStream::error_stream(),
 751                 "The specified size exceeds the maximum "
 752                 "representable size.\n");
 753     break;
 754   case arg_too_small:
 755   case arg_unreadable:
 756   case arg_in_range:
 757     // do nothing for now
 758     break;
 759   default:
 760     ShouldNotReachHere();
 761   }
 762 }
 763 
 764 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
 765   if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
 766     return true;
 767   } else {
 768     return false;
 769   }
 770 }
 771 
 772 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
 773   // strtod allows leading whitespace, but our flag format does not.
 774   if (*value == '\0' || isspace((unsigned char) *value)) {
 775     return false;
 776   }
 777   char* end;
 778   errno = 0;
 779   double v = strtod(value, &end);
 780   if ((errno != 0) || (*end != 0)) {
 781     return false;
 782   }
 783   if (g_isnan(v) || !g_isfinite(v)) {
 784     // Currently we cannot handle these special values.
 785     return false;
 786   }
 787 
 788   if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
 789     return true;
 790   }
 791   return false;
 792 }
 793 
 794 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
 795   JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
 796 
 797   if (flag->is_int()) {
 798     int v;
 799     if (parse_integer(value, &v)) {
 800       result = JVMFlagAccess::set_int(flag, &v, origin);
 801     }
 802   } else if (flag->is_uint()) {
 803     uint v;
 804     if (parse_integer(value, &v)) {
 805       result = JVMFlagAccess::set_uint(flag, &v, origin);
 806     }
 807   } else if (flag->is_intx()) {
 808     intx v;
 809     if (parse_integer(value, &v)) {
 810       result = JVMFlagAccess::set_intx(flag, &v, origin);
 811     }
 812   } else if (flag->is_uintx()) {
 813     uintx v;
 814     if (parse_integer(value, &v)) {
 815       result = JVMFlagAccess::set_uintx(flag, &v, origin);
 816     }
 817   } else if (flag->is_uint64_t()) {
 818     uint64_t v;
 819     if (parse_integer(value, &v)) {
 820       result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
 821     }
 822   } else if (flag->is_size_t()) {
 823     size_t v;
 824     if (parse_integer(value, &v)) {
 825       result = JVMFlagAccess::set_size_t(flag, &v, origin);
 826     }
 827   }
 828 
 829   return result == JVMFlag::SUCCESS;
 830 }
 831 
 832 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
 833   if (value[0] == '\0') {
 834     value = nullptr;
 835   }
 836   if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
 837   // Contract:  JVMFlag always returns a pointer that needs freeing.
 838   FREE_C_HEAP_ARRAY(char, value);
 839   return true;
 840 }
 841 
 842 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
 843   const char* old_value = "";
 844   if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
 845   size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
 846   size_t new_len = strlen(new_value);
 847   const char* value;
 848   char* free_this_too = nullptr;
 849   if (old_len == 0) {
 850     value = new_value;
 851   } else if (new_len == 0) {
 852     value = old_value;
 853   } else {
 854      size_t length = old_len + 1 + new_len + 1;
 855      char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
 856     // each new setting adds another LINE to the switch:
 857     jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
 858     value = buf;
 859     free_this_too = buf;
 860   }
 861   (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
 862   // JVMFlag always returns a pointer that needs freeing.
 863   FREE_C_HEAP_ARRAY(char, value);
 864   // JVMFlag made its own copy, so I must delete my own temp. buffer.
 865   FREE_C_HEAP_ARRAY(char, free_this_too);
 866   return true;
 867 }
 868 
 869 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
 870   const char* real_name = real_flag_name(arg);
 871   JDK_Version since = JDK_Version();
 872   switch (is_deprecated_flag(arg, &since)) {
 873   case -1: {
 874       // Obsolete or expired, so don't process normally,
 875       // but allow for an obsolete flag we're still
 876       // temporarily allowing.
 877       if (!is_obsolete_flag(arg, &since)) {
 878         return real_name;
 879       }
 880       // Note if we're not considered obsolete then we can't be expired either
 881       // as obsoletion must come first.
 882       return nullptr;
 883     }
 884     case 0:
 885       return real_name;
 886     case 1: {
 887       char version[256];
 888       since.to_string(version, sizeof(version));
 889       if (real_name != arg) {
 890         warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
 891                 arg, version, real_name);
 892       } else {
 893         warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
 894                 arg, version);
 895       }
 896       return real_name;
 897     }
 898   }
 899   ShouldNotReachHere();
 900   return nullptr;
 901 }
 902 
 903 #define BUFLEN 255
 904 
 905 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
 906   char name_copied[BUFLEN+1];
 907   if (name[name_length] != 0) {
 908     if (name_length > BUFLEN) {
 909       return nullptr;
 910     } else {
 911       strncpy(name_copied, name, name_length);
 912       name_copied[name_length] = '\0';
 913       name = name_copied;
 914     }
 915   }
 916 
 917   const char* real_name = Arguments::handle_aliases_and_deprecation(name);
 918   if (real_name == nullptr) {
 919     return nullptr;
 920   }
 921   JVMFlag* flag = JVMFlag::find_flag(real_name);
 922   return flag;
 923 }
 924 
 925 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
 926   bool is_bool = false;
 927   bool bool_val = false;
 928   char c = *arg;
 929   if (c == '+' || c == '-') {
 930     is_bool = true;
 931     bool_val = (c == '+');
 932     arg++;
 933   }
 934 
 935   const char* name = arg;
 936   while (true) {
 937     c = *arg;
 938     if (isalnum(c) || (c == '_')) {
 939       ++arg;
 940     } else {
 941       break;
 942     }
 943   }
 944 
 945   size_t name_len = size_t(arg - name);
 946   if (name_len == 0) {
 947     return false;
 948   }
 949 
 950   JVMFlag* flag = find_jvm_flag(name, name_len);
 951   if (flag == nullptr) {
 952     return false;
 953   }
 954 
 955   if (is_bool) {
 956     if (*arg != 0) {
 957       // Error -- extra characters such as -XX:+BoolFlag=123
 958       return false;
 959     }
 960     return set_bool_flag(flag, bool_val, origin);
 961   }
 962 
 963   if (arg[0] == '=') {
 964     const char* value = arg + 1;
 965     if (flag->is_ccstr()) {
 966       if (flag->ccstr_accumulates()) {
 967         return append_to_string_flag(flag, value, origin);
 968       } else {
 969         return set_string_flag(flag, value, origin);
 970       }
 971     } else if (flag->is_double()) {
 972       return set_fp_numeric_flag(flag, value, origin);
 973     } else {
 974       return set_numeric_flag(flag, value, origin);
 975     }
 976   }
 977 
 978   if (arg[0] == ':' && arg[1] == '=') {
 979     // -XX:Foo:=xxx will reset the string flag to the given value.
 980     const char* value = arg + 2;
 981     return set_string_flag(flag, value, origin);
 982   }
 983 
 984   return false;
 985 }
 986 
 987 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 988   assert(bldarray != nullptr, "illegal argument");
 989 
 990   if (arg == nullptr) {
 991     return;
 992   }
 993 
 994   int new_count = *count + 1;
 995 
 996   // expand the array and add arg to the last element
 997   if (*bldarray == nullptr) {
 998     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
 999   } else {
1000     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1001   }
1002   (*bldarray)[*count] = os::strdup_check_oom(arg);
1003   *count = new_count;
1004 }
1005 
1006 void Arguments::build_jvm_args(const char* arg) {
1007   add_string(&_jvm_args_array, &_num_jvm_args, arg);
1008 }
1009 
1010 void Arguments::build_jvm_flags(const char* arg) {
1011   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1012 }
1013 
1014 // utility function to return a string that concatenates all
1015 // strings in a given char** array
1016 const char* Arguments::build_resource_string(char** args, int count) {
1017   if (args == nullptr || count == 0) {
1018     return nullptr;
1019   }
1020   size_t length = 0;
1021   for (int i = 0; i < count; i++) {
1022     length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1023   }
1024   char* s = NEW_RESOURCE_ARRAY(char, length);
1025   char* dst = s;
1026   for (int j = 0; j < count; j++) {
1027     size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1028     jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1029     dst += offset;
1030     length -= offset;
1031   }
1032   return (const char*) s;
1033 }
1034 
1035 void Arguments::print_on(outputStream* st) {
1036   st->print_cr("VM Arguments:");
1037   if (num_jvm_flags() > 0) {
1038     st->print("jvm_flags: "); print_jvm_flags_on(st);
1039     st->cr();
1040   }
1041   if (num_jvm_args() > 0) {
1042     st->print("jvm_args: "); print_jvm_args_on(st);
1043     st->cr();
1044   }
1045   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1046   if (_java_class_path != nullptr) {
1047     char* path = _java_class_path->value();
1048     size_t len = strlen(path);
1049     st->print("java_class_path (initial): ");
1050     // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1051     if (len == 0) {
1052       st->print_raw_cr("<not set>");
1053     } else {
1054       st->print_raw_cr(path, len);
1055     }
1056   }
1057   st->print_cr("Launcher Type: %s", _sun_java_launcher);
1058 }
1059 
1060 void Arguments::print_summary_on(outputStream* st) {
1061   // Print the command line.  Environment variables that are helpful for
1062   // reproducing the problem are written later in the hs_err file.
1063   // flags are from setting file
1064   if (num_jvm_flags() > 0) {
1065     st->print_raw("Settings File: ");
1066     print_jvm_flags_on(st);
1067     st->cr();
1068   }
1069   // args are the command line and environment variable arguments.
1070   st->print_raw("Command Line: ");
1071   if (num_jvm_args() > 0) {
1072     print_jvm_args_on(st);
1073   }
1074   // this is the classfile and any arguments to the java program
1075   if (java_command() != nullptr) {
1076     st->print("%s", java_command());
1077   }
1078   st->cr();
1079 }
1080 
1081 void Arguments::print_jvm_flags_on(outputStream* st) {
1082   if (_num_jvm_flags > 0) {
1083     for (int i=0; i < _num_jvm_flags; i++) {
1084       st->print("%s ", _jvm_flags_array[i]);
1085     }
1086   }
1087 }
1088 
1089 void Arguments::print_jvm_args_on(outputStream* st) {
1090   if (_num_jvm_args > 0) {
1091     for (int i=0; i < _num_jvm_args; i++) {
1092       st->print("%s ", _jvm_args_array[i]);
1093     }
1094   }
1095 }
1096 
1097 bool Arguments::process_argument(const char* arg,
1098                                  jboolean ignore_unrecognized,
1099                                  JVMFlagOrigin origin) {
1100   JDK_Version since = JDK_Version();
1101 
1102   if (parse_argument(arg, origin)) {
1103     return true;
1104   }
1105 
1106   // Determine if the flag has '+', '-', or '=' characters.
1107   bool has_plus_minus = (*arg == '+' || *arg == '-');
1108   const char* const argname = has_plus_minus ? arg + 1 : arg;
1109 
1110   size_t arg_len;
1111   const char* equal_sign = strchr(argname, '=');
1112   if (equal_sign == nullptr) {
1113     arg_len = strlen(argname);
1114   } else {
1115     arg_len = equal_sign - argname;
1116   }
1117 
1118   // Only make the obsolete check for valid arguments.
1119   if (arg_len <= BUFLEN) {
1120     // Construct a string which consists only of the argument name without '+', '-', or '='.
1121     char stripped_argname[BUFLEN+1]; // +1 for '\0'
1122     jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1123     if (is_obsolete_flag(stripped_argname, &since)) {
1124       char version[256];
1125       since.to_string(version, sizeof(version));
1126       warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1127       return true;
1128     }
1129   }
1130 
1131   // For locked flags, report a custom error message if available.
1132   // Otherwise, report the standard unrecognized VM option.
1133   const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1134   if (found_flag != nullptr) {
1135     char locked_message_buf[BUFLEN];
1136     JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1137     if (strlen(locked_message_buf) != 0) {
1138 #ifdef PRODUCT
1139       bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1140       if (ignore_unrecognized && mismatched) {
1141         return true;
1142       }
1143 #endif
1144       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1145     }
1146     if (found_flag->is_bool() && !has_plus_minus) {
1147       jio_fprintf(defaultStream::error_stream(),
1148         "Missing +/- setting for VM option '%s'\n", argname);
1149     } else if (!found_flag->is_bool() && has_plus_minus) {
1150       jio_fprintf(defaultStream::error_stream(),
1151         "Unexpected +/- setting in VM option '%s'\n", argname);
1152     } else {
1153       jio_fprintf(defaultStream::error_stream(),
1154         "Improperly specified VM option '%s'\n", argname);
1155     }
1156   } else {
1157     if (ignore_unrecognized) {
1158       return true;
1159     }
1160     jio_fprintf(defaultStream::error_stream(),
1161                 "Unrecognized VM option '%s'\n", argname);
1162     JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1163     if (fuzzy_matched != nullptr) {
1164       jio_fprintf(defaultStream::error_stream(),
1165                   "Did you mean '%s%s%s'?\n",
1166                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1167                   fuzzy_matched->name(),
1168                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
1169     }
1170   }
1171 
1172   // allow for commandline "commenting out" options like -XX:#+Verbose
1173   return arg[0] == '#';
1174 }
1175 
1176 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1177   FILE* stream = os::fopen(file_name, "rb");
1178   if (stream == nullptr) {
1179     if (should_exist) {
1180       jio_fprintf(defaultStream::error_stream(),
1181                   "Could not open settings file %s\n", file_name);
1182       return false;
1183     } else {
1184       return true;
1185     }
1186   }
1187 
1188   char token[1024];
1189   int  pos = 0;
1190 
1191   bool in_white_space = true;
1192   bool in_comment     = false;
1193   bool in_quote       = false;
1194   int  quote_c        = 0;
1195   bool result         = true;
1196 
1197   int c = getc(stream);
1198   while(c != EOF && pos < (int)(sizeof(token)-1)) {
1199     if (in_white_space) {
1200       if (in_comment) {
1201         if (c == '\n') in_comment = false;
1202       } else {
1203         if (c == '#') in_comment = true;
1204         else if (!isspace((unsigned char) c)) {
1205           in_white_space = false;
1206           token[pos++] = checked_cast<char>(c);
1207         }
1208       }
1209     } else {
1210       if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1211         // token ends at newline, or at unquoted whitespace
1212         // this allows a way to include spaces in string-valued options
1213         token[pos] = '\0';
1214         logOption(token);
1215         result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1216         build_jvm_flags(token);
1217         pos = 0;
1218         in_white_space = true;
1219         in_quote = false;
1220       } else if (!in_quote && (c == '\'' || c == '"')) {
1221         in_quote = true;
1222         quote_c = c;
1223       } else if (in_quote && (c == quote_c)) {
1224         in_quote = false;
1225       } else {
1226         token[pos++] = checked_cast<char>(c);
1227       }
1228     }
1229     c = getc(stream);
1230   }
1231   if (pos > 0) {
1232     token[pos] = '\0';
1233     result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1234     build_jvm_flags(token);
1235   }
1236   fclose(stream);
1237   return result;
1238 }
1239 
1240 //=============================================================================================================
1241 // Parsing of properties (-D)
1242 
1243 const char* Arguments::get_property(const char* key) {
1244   return PropertyList_get_value(system_properties(), key);
1245 }
1246 
1247 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1248   const char* eq = strchr(prop, '=');
1249   const char* key;
1250   const char* value = "";
1251 
1252   if (eq == nullptr) {
1253     // property doesn't have a value, thus use passed string
1254     key = prop;
1255   } else {
1256     // property have a value, thus extract it and save to the
1257     // allocated string
1258     size_t key_len = eq - prop;
1259     char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1260 
1261     jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1262     key = tmp_key;
1263 
1264     value = &prop[key_len + 1];
1265   }
1266 
1267   if (internal == ExternalProperty) {
1268     CDSConfig::check_incompatible_property(key, value);
1269   }
1270 
1271   if (strcmp(key, "java.compiler") == 0) {
1272     // we no longer support java.compiler system property, log a warning and let it get
1273     // passed to Java, like any other system property
1274     if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1275         // for applications using NONE or empty value, log a more informative message
1276         warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1277     } else {
1278         warning("The java.compiler system property is obsolete and no longer supported.");
1279     }
1280   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
1281     // sun.java.launcher.is_altjvm property is
1282     // private and is processed in process_sun_java_launcher_properties();
1283     // the sun.java.launcher property is passed on to the java application
1284   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1285     // append is true, writable is true, internal is false
1286     PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1287                             WriteableProperty, ExternalProperty);
1288   } else {
1289     if (strcmp(key, "sun.java.command") == 0) {
1290       char *old_java_command = _java_command;
1291       _java_command = os::strdup_check_oom(value, mtArguments);
1292       if (old_java_command != nullptr) {
1293         os::free(old_java_command);
1294       }
1295     } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1296       // If this property is set on the command line then its value will be
1297       // displayed in VM error logs as the URL at which to submit such logs.
1298       // Normally the URL displayed in error logs is different from the value
1299       // of this system property, so a different property should have been
1300       // used here, but we leave this as-is in case someone depends upon it.
1301       const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1302       // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1303       // its value without going through the property list or making a Java call.
1304       _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1305       if (old_java_vendor_url_bug != nullptr) {
1306         os::free((void *)old_java_vendor_url_bug);
1307       }
1308     }
1309 
1310     // Create new property and add at the end of the list
1311     PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1312   }
1313 
1314   if (key != prop) {
1315     // SystemProperty copy passed value, thus free previously allocated
1316     // memory
1317     FreeHeap((void *)key);
1318   }
1319 
1320   return true;
1321 }
1322 
1323 //===========================================================================================================
1324 // Setting int/mixed/comp mode flags
1325 
1326 void Arguments::set_mode_flags(Mode mode) {
1327   // Set up default values for all flags.
1328   // If you add a flag to any of the branches below,
1329   // add a default value for it here.
1330   _mode                      = mode;
1331 
1332   // Ensure Agent_OnLoad has the correct initial values.
1333   // This may not be the final mode; mode may change later in onload phase.
1334   PropertyList_unique_add(&_system_properties, "java.vm.info",
1335                           VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1336 
1337   UseInterpreter             = true;
1338   UseCompiler                = true;
1339   UseLoopCounter             = true;
1340 
1341   // Default values may be platform/compiler dependent -
1342   // use the saved values
1343   ClipInlining               = Arguments::_ClipInlining;
1344   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1345   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1346   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1347 
1348   // Change from defaults based on mode
1349   switch (mode) {
1350   default:
1351     ShouldNotReachHere();
1352     break;
1353   case _int:
1354     UseCompiler              = false;
1355     UseLoopCounter           = false;
1356     AlwaysCompileLoopMethods = false;
1357     UseOnStackReplacement    = false;
1358     break;
1359   case _mixed:
1360     // same as default
1361     break;
1362   case _comp:
1363     UseInterpreter           = false;
1364     BackgroundCompilation    = false;
1365     ClipInlining             = false;
1366     break;
1367   }
1368 }
1369 
1370 // Conflict: required to use shared spaces (-Xshare:on), but
1371 // incompatible command line options were chosen.
1372 void Arguments::no_shared_spaces(const char* message) {
1373   if (RequireSharedSpaces) {
1374     jio_fprintf(defaultStream::error_stream(),
1375       "Class data sharing is inconsistent with other specified options.\n");
1376     vm_exit_during_initialization("Unable to use shared archive", message);
1377   } else {
1378     log_info(cds)("Unable to use shared archive: %s", message);
1379     UseSharedSpaces = false;
1380   }
1381 }
1382 
1383 static void set_object_alignment() {
1384   // Object alignment.
1385   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1386   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1387   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1388   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1389   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1390   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1391 
1392   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1393   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1394 
1395   // Oop encoding heap max
1396   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1397 }
1398 
1399 size_t Arguments::max_heap_for_compressed_oops() {
1400   // Avoid sign flip.
1401   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1402   // We need to fit both the null page and the heap into the memory budget, while
1403   // keeping alignment constraints of the heap. To guarantee the latter, as the
1404   // null page is located before the heap, we pad the null page to the conservative
1405   // maximum alignment that the GC may ever impose upon the heap.
1406   size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1407                                                   _conservative_max_heap_alignment);
1408 
1409   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1410   NOT_LP64(ShouldNotReachHere(); return 0);
1411 }
1412 
1413 void Arguments::set_use_compressed_oops() {
1414 #ifdef _LP64
1415   // MaxHeapSize is not set up properly at this point, but
1416   // the only value that can override MaxHeapSize if we are
1417   // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1418   size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1419 
1420   if (max_heap_size <= max_heap_for_compressed_oops()) {
1421     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1422       FLAG_SET_ERGO(UseCompressedOops, true);
1423     }
1424   } else {
1425     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1426       warning("Max heap size too large for Compressed Oops");
1427       FLAG_SET_DEFAULT(UseCompressedOops, false);
1428     }
1429   }
1430 #endif // _LP64
1431 }
1432 
1433 void Arguments::set_conservative_max_heap_alignment() {
1434   // The conservative maximum required alignment for the heap is the maximum of
1435   // the alignments imposed by several sources: any requirements from the heap
1436   // itself and the maximum page size we may run the VM with.
1437   size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1438   _conservative_max_heap_alignment = MAX4(heap_alignment,
1439                                           os::vm_allocation_granularity(),
1440                                           os::max_page_size(),
1441                                           GCArguments::compute_heap_alignment());
1442 }
1443 
1444 jint Arguments::set_ergonomics_flags() {
1445   GCConfig::initialize();
1446 
1447   set_conservative_max_heap_alignment();
1448 
1449 #ifdef _LP64
1450   set_use_compressed_oops();
1451 
1452   // Also checks that certain machines are slower with compressed oops
1453   // in vm_version initialization code.
1454 #endif // _LP64
1455 
1456   return JNI_OK;
1457 }
1458 
1459 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1460   size_t max_allocatable;
1461   size_t result = limit;
1462   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1463     // The AggressiveHeap check is a temporary workaround to avoid calling
1464     // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1465     // selected. This works because AggressiveHeap implies UseParallelGC
1466     // where we know the ratio will be 1. Once the AggressiveHeap option is
1467     // removed, this can be cleaned up.
1468     size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1469     size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1470     result = MIN2(result, max_allocatable / fraction);
1471   }
1472   return result;
1473 }
1474 
1475 // Use static initialization to get the default before parsing
1476 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1477 
1478 void Arguments::set_heap_size() {
1479   julong phys_mem;
1480 
1481   // If the user specified one of these options, they
1482   // want specific memory sizing so do not limit memory
1483   // based on compressed oops addressability.
1484   // Also, memory limits will be calculated based on
1485   // available os physical memory, not our MaxRAM limit,
1486   // unless MaxRAM is also specified.
1487   bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1488                            !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1489                            !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1490                            !FLAG_IS_DEFAULT(MaxRAM));
1491   if (override_coop_limit) {
1492     if (FLAG_IS_DEFAULT(MaxRAM)) {
1493       phys_mem = os::physical_memory();
1494       FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1495     } else {
1496       phys_mem = (julong)MaxRAM;
1497     }
1498   } else {
1499     phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1500                                        : (julong)MaxRAM;
1501   }
1502 
1503   // If the maximum heap size has not been set with -Xmx,
1504   // then set it as fraction of the size of physical memory,
1505   // respecting the maximum and minimum sizes of the heap.
1506   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1507     julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1508     const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1509     if (reasonable_min < MaxHeapSize) {
1510       // Small physical memory, so use a minimum fraction of it for the heap
1511       reasonable_max = reasonable_min;
1512     } else {
1513       // Not-small physical memory, so require a heap at least
1514       // as large as MaxHeapSize
1515       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1516     }
1517 
1518     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1519       // Limit the heap size to ErgoHeapSizeLimit
1520       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1521     }
1522 
1523     reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1524 
1525     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1526       // An initial heap size was specified on the command line,
1527       // so be sure that the maximum size is consistent.  Done
1528       // after call to limit_heap_by_allocatable_memory because that
1529       // method might reduce the allocation size.
1530       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1531     } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1532       reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1533     }
1534 
1535 #ifdef _LP64
1536     if (UseCompressedOops || UseCompressedClassPointers) {
1537       // HeapBaseMinAddress can be greater than default but not less than.
1538       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1539         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1540           // matches compressed oops printing flags
1541           log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1542                                      " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1543                                      DefaultHeapBaseMinAddress,
1544                                      DefaultHeapBaseMinAddress/G,
1545                                      HeapBaseMinAddress);
1546           FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1547         }
1548       }
1549     }
1550     if (UseCompressedOops) {
1551       // Limit the heap size to the maximum possible when using compressed oops
1552       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1553 
1554       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1555         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1556         // but it should be not less than default MaxHeapSize.
1557         max_coop_heap -= HeapBaseMinAddress;
1558       }
1559 
1560       // If user specified flags prioritizing os physical
1561       // memory limits, then disable compressed oops if
1562       // limits exceed max_coop_heap and UseCompressedOops
1563       // was not specified.
1564       if (reasonable_max > max_coop_heap) {
1565         if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1566           log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1567             " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1568             "Please check the setting of MaxRAMPercentage %5.2f."
1569             ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1570           FLAG_SET_ERGO(UseCompressedOops, false);
1571         } else {
1572           reasonable_max = MIN2(reasonable_max, max_coop_heap);
1573         }
1574       }
1575     }
1576 #endif // _LP64
1577 
1578     log_trace(gc, heap)("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1579     FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1580   }
1581 
1582   // If the minimum or initial heap_size have not been set or requested to be set
1583   // ergonomically, set them accordingly.
1584   if (InitialHeapSize == 0 || MinHeapSize == 0) {
1585     julong reasonable_minimum = (julong)(OldSize + NewSize);
1586 
1587     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1588 
1589     reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1590 
1591     if (InitialHeapSize == 0) {
1592       julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1593       reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1594 
1595       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1596       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1597 
1598       FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1599       log_trace(gc, heap)("  Initial heap size " SIZE_FORMAT, InitialHeapSize);
1600     }
1601     // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1602     // synchronize with InitialHeapSize to avoid errors with the default value.
1603     if (MinHeapSize == 0) {
1604       FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1605       log_trace(gc, heap)("  Minimum heap size " SIZE_FORMAT, MinHeapSize);
1606     }
1607   }
1608 }
1609 
1610 // This option inspects the machine and attempts to set various
1611 // parameters to be optimal for long-running, memory allocation
1612 // intensive jobs.  It is intended for machines with large
1613 // amounts of cpu and memory.
1614 jint Arguments::set_aggressive_heap_flags() {
1615   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1616   // VM, but we may not be able to represent the total physical memory
1617   // available (like having 8gb of memory on a box but using a 32bit VM).
1618   // Thus, we need to make sure we're using a julong for intermediate
1619   // calculations.
1620   julong initHeapSize;
1621   julong total_memory = os::physical_memory();
1622 
1623   if (total_memory < (julong) 256 * M) {
1624     jio_fprintf(defaultStream::error_stream(),
1625             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1626     vm_exit(1);
1627   }
1628 
1629   // The heap size is half of available memory, or (at most)
1630   // all of possible memory less 160mb (leaving room for the OS
1631   // when using ISM).  This is the maximum; because adaptive sizing
1632   // is turned on below, the actual space used may be smaller.
1633 
1634   initHeapSize = MIN2(total_memory / (julong) 2,
1635           total_memory - (julong) 160 * M);
1636 
1637   initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1638 
1639   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1640     if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1641       return JNI_EINVAL;
1642     }
1643     if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1644       return JNI_EINVAL;
1645     }
1646     if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1647       return JNI_EINVAL;
1648     }
1649   }
1650   if (FLAG_IS_DEFAULT(NewSize)) {
1651     // Make the young generation 3/8ths of the total heap.
1652     if (FLAG_SET_CMDLINE(NewSize,
1653             ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1654       return JNI_EINVAL;
1655     }
1656     if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1657       return JNI_EINVAL;
1658     }
1659   }
1660 
1661 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
1662   FLAG_SET_DEFAULT(UseLargePages, true);
1663 #endif
1664 
1665   // Increase some data structure sizes for efficiency
1666   if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1667     return JNI_EINVAL;
1668   }
1669   if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1670     return JNI_EINVAL;
1671   }
1672 
1673   // See the OldPLABSize comment below, but replace 'after promotion'
1674   // with 'after copying'.  YoungPLABSize is the size of the survivor
1675   // space per-gc-thread buffers.  The default is 4kw.
1676   if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1677     return JNI_EINVAL;
1678   }
1679 
1680   // OldPLABSize is the size of the buffers in the old gen that
1681   // UseParallelGC uses to promote live data that doesn't fit in the
1682   // survivor spaces.  At any given time, there's one for each gc thread.
1683   // The default size is 1kw. These buffers are rarely used, since the
1684   // survivor spaces are usually big enough.  For specjbb, however, there
1685   // are occasions when there's lots of live data in the young gen
1686   // and we end up promoting some of it.  We don't have a definite
1687   // explanation for why bumping OldPLABSize helps, but the theory
1688   // is that a bigger PLAB results in retaining something like the
1689   // original allocation order after promotion, which improves mutator
1690   // locality.  A minor effect may be that larger PLABs reduce the
1691   // number of PLAB allocation events during gc.  The value of 8kw
1692   // was arrived at by experimenting with specjbb.
1693   if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1694     return JNI_EINVAL;
1695   }
1696 
1697   // Enable parallel GC and adaptive generation sizing
1698   if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1699     return JNI_EINVAL;
1700   }
1701 
1702   // Encourage steady state memory management
1703   if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1704     return JNI_EINVAL;
1705   }
1706 
1707   return JNI_OK;
1708 }
1709 
1710 // This must be called after ergonomics.
1711 void Arguments::set_bytecode_flags() {
1712   if (!RewriteBytecodes) {
1713     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1714   }
1715 }
1716 
1717 // Aggressive optimization flags
1718 jint Arguments::set_aggressive_opts_flags() {
1719 #ifdef COMPILER2
1720   if (AggressiveUnboxing) {
1721     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1722       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1723     } else if (!EliminateAutoBox) {
1724       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1725       AggressiveUnboxing = false;
1726     }
1727     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1728       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1729     } else if (!DoEscapeAnalysis) {
1730       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1731       AggressiveUnboxing = false;
1732     }
1733   }
1734   if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1735     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1736       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1737     }
1738     // Feed the cache size setting into the JDK
1739     char buffer[1024];
1740     jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1741     if (!add_property(buffer)) {
1742       return JNI_ENOMEM;
1743     }
1744   }
1745 #endif
1746 
1747   return JNI_OK;
1748 }
1749 
1750 //===========================================================================================================
1751 
1752 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1753   if (_sun_java_launcher != _default_java_launcher) {
1754     os::free(const_cast<char*>(_sun_java_launcher));
1755   }
1756   _sun_java_launcher = os::strdup_check_oom(launcher);
1757 }
1758 
1759 bool Arguments::created_by_java_launcher() {
1760   assert(_sun_java_launcher != nullptr, "property must have value");
1761   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1762 }
1763 
1764 bool Arguments::sun_java_launcher_is_altjvm() {
1765   return _sun_java_launcher_is_altjvm;
1766 }
1767 
1768 //===========================================================================================================
1769 // Parsing of main arguments
1770 
1771 unsigned int addreads_count = 0;
1772 unsigned int addexports_count = 0;
1773 unsigned int addopens_count = 0;
1774 unsigned int patch_mod_count = 0;
1775 unsigned int enable_native_access_count = 0;
1776 
1777 // Check the consistency of vm_init_args
1778 bool Arguments::check_vm_args_consistency() {
1779   // Method for adding checks for flag consistency.
1780   // The intent is to warn the user of all possible conflicts,
1781   // before returning an error.
1782   // Note: Needs platform-dependent factoring.
1783   bool status = true;
1784 
1785   if (TLABRefillWasteFraction == 0) {
1786     jio_fprintf(defaultStream::error_stream(),
1787                 "TLABRefillWasteFraction should be a denominator, "
1788                 "not " SIZE_FORMAT "\n",
1789                 TLABRefillWasteFraction);
1790     status = false;
1791   }
1792 
1793   status = CompilerConfig::check_args_consistency(status);
1794 #if INCLUDE_JVMCI
1795   if (status && EnableJVMCI) {
1796     PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1797         AddProperty, UnwriteableProperty, InternalProperty);
1798     if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {
1799       if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1800         return false;
1801       }
1802     }
1803   }
1804 #endif
1805 
1806 #if INCLUDE_JFR
1807   if (status && (FlightRecorderOptions || StartFlightRecording)) {
1808     if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1809       return false;
1810     }
1811   }
1812 #endif
1813 
1814 #ifndef SUPPORT_RESERVED_STACK_AREA
1815   if (StackReservedPages != 0) {
1816     FLAG_SET_CMDLINE(StackReservedPages, 0);
1817     warning("Reserved Stack Area not supported on this platform");
1818   }
1819 #endif
1820 
1821 #ifndef _LP64
1822   if (LockingMode == LM_LEGACY) {
1823     FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT);
1824     // Self-forwarding in bit 3 of the mark-word conflicts
1825     // with 4-byte-aligned stack-locks.
1826     warning("Legacy locking not supported on this platform");
1827   }
1828 #endif
1829 
1830   if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1831     // ObjectMonitorTable requires lightweight locking.
1832     FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1833     warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1834   }
1835 
1836 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1837   if (LockingMode == LM_MONITOR) {
1838     jio_fprintf(defaultStream::error_stream(),
1839                 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1840     return false;
1841   }
1842 #endif
1843   if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1844     jio_fprintf(defaultStream::error_stream(),
1845                 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1846     return false;
1847   }
1848   return status;
1849 }
1850 
1851 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1852   const char* option_type) {
1853   if (ignore) return false;
1854 
1855   const char* spacer = " ";
1856   if (option_type == nullptr) {
1857     option_type = ++spacer; // Set both to the empty string.
1858   }
1859 
1860   jio_fprintf(defaultStream::error_stream(),
1861               "Unrecognized %s%soption: %s\n", option_type, spacer,
1862               option->optionString);
1863   return true;
1864 }
1865 
1866 static const char* user_assertion_options[] = {
1867   "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1868 };
1869 
1870 static const char* system_assertion_options[] = {
1871   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1872 };
1873 
1874 bool Arguments::parse_uint(const char* value,
1875                            uint* uint_arg,
1876                            uint min_size) {
1877   uint n;
1878   if (!parse_integer(value, &n)) {
1879     return false;
1880   }
1881   if (n >= min_size) {
1882     *uint_arg = n;
1883     return true;
1884   } else {
1885     return false;
1886   }
1887 }
1888 
1889 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1890   assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1891   CDSConfig::check_internal_module_property(prop_name, prop_value);
1892   size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1893   char* property = AllocateHeap(prop_len, mtArguments);
1894   int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1895   if (ret < 0 || ret >= (int)prop_len) {
1896     FreeHeap(property);
1897     return false;
1898   }
1899   // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1900   // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1901   // that multiple occurrences of the associated flag just causes the existing property value to be
1902   // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1903   // to a property after we have finished flag processing.
1904   bool added = add_property(property, WriteableProperty, internal);
1905   FreeHeap(property);
1906   return added;
1907 }
1908 
1909 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1910   assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1911   CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1912   const unsigned int props_count_limit = 1000;
1913   const int max_digits = 3;
1914   const int extra_symbols_count = 3; // includes '.', '=', '\0'
1915 
1916   // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1917   if (count < props_count_limit) {
1918     size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1919     char* property = AllocateHeap(prop_len, mtArguments);
1920     int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1921     if (ret < 0 || ret >= (int)prop_len) {
1922       FreeHeap(property);
1923       jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1924       return false;
1925     }
1926     bool added = add_property(property, UnwriteableProperty, InternalProperty);
1927     FreeHeap(property);
1928     return added;
1929   }
1930 
1931   jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1932   return false;
1933 }
1934 
1935 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1936                                                   julong* long_arg,
1937                                                   julong min_size,
1938                                                   julong max_size) {
1939   if (!parse_integer(s, long_arg)) return arg_unreadable;
1940   return check_memory_size(*long_arg, min_size, max_size);
1941 }
1942 
1943 // Parse JavaVMInitArgs structure
1944 
1945 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1946                                    const JavaVMInitArgs *java_tool_options_args,
1947                                    const JavaVMInitArgs *java_options_args,
1948                                    const JavaVMInitArgs *cmd_line_args) {
1949   bool patch_mod_javabase = false;
1950 
1951   // Save default settings for some mode flags
1952   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1953   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
1954   Arguments::_ClipInlining             = ClipInlining;
1955   Arguments::_BackgroundCompilation    = BackgroundCompilation;
1956 
1957   // Remember the default value of SharedBaseAddress.
1958   Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1959 
1960   // Setup flags for mixed which is the default
1961   set_mode_flags(_mixed);
1962 
1963   // Parse args structure generated from java.base vm options resource
1964   jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1965   if (result != JNI_OK) {
1966     return result;
1967   }
1968 
1969   // Parse args structure generated from JAVA_TOOL_OPTIONS environment
1970   // variable (if present).
1971   result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1972   if (result != JNI_OK) {
1973     return result;
1974   }
1975 
1976   // Parse args structure generated from the command line flags.
1977   result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1978   if (result != JNI_OK) {
1979     return result;
1980   }
1981 
1982   // Parse args structure generated from the _JAVA_OPTIONS environment
1983   // variable (if present) (mimics classic VM)
1984   result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1985   if (result != JNI_OK) {
1986     return result;
1987   }
1988 
1989   // Disable CDS for exploded image
1990   if (!has_jimage()) {
1991     no_shared_spaces("CDS disabled on exploded JDK");
1992   }
1993 
1994   // We need to ensure processor and memory resources have been properly
1995   // configured - which may rely on arguments we just processed - before
1996   // doing the final argument processing. Any argument processing that
1997   // needs to know about processor and memory resources must occur after
1998   // this point.
1999 
2000   os::init_container_support();
2001 
2002   SystemMemoryBarrier::initialize();
2003 
2004   // Do final processing now that all arguments have been parsed
2005   result = finalize_vm_init_args(patch_mod_javabase);
2006   if (result != JNI_OK) {
2007     return result;
2008   }
2009 
2010   return JNI_OK;
2011 }
2012 
2013 #if !INCLUDE_JVMTI
2014 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2015 // represents a valid JDWP agent.  is_path==true denotes that we
2016 // are dealing with -agentpath (case where name is a path), otherwise with
2017 // -agentlib
2018 static bool valid_jdwp_agent(char *name, bool is_path) {
2019   char *_name;
2020   const char *_jdwp = "jdwp";
2021   size_t _len_jdwp, _len_prefix;
2022 
2023   if (is_path) {
2024     if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2025       return false;
2026     }
2027 
2028     _name++;  // skip past last path separator
2029     _len_prefix = strlen(JNI_LIB_PREFIX);
2030 
2031     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2032       return false;
2033     }
2034 
2035     _name += _len_prefix;
2036     _len_jdwp = strlen(_jdwp);
2037 
2038     if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2039       _name += _len_jdwp;
2040     }
2041     else {
2042       return false;
2043     }
2044 
2045     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2046       return false;
2047     }
2048 
2049     return true;
2050   }
2051 
2052   if (strcmp(name, _jdwp) == 0) {
2053     return true;
2054   }
2055 
2056   return false;
2057 }
2058 #endif
2059 
2060 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2061   // --patch-module=<module>=<file>(<pathsep><file>)*
2062   assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2063   // Find the equal sign between the module name and the path specification
2064   const char* module_equal = strchr(patch_mod_tail, '=');
2065   if (module_equal == nullptr) {
2066     jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2067     return JNI_ERR;
2068   } else {
2069     // Pick out the module name
2070     size_t module_len = module_equal - patch_mod_tail;
2071     char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2072     if (module_name != nullptr) {
2073       memcpy(module_name, patch_mod_tail, module_len);
2074       *(module_name + module_len) = '\0';
2075       // The path piece begins one past the module_equal sign
2076       add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2077       FREE_C_HEAP_ARRAY(char, module_name);
2078       if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2079         return JNI_ENOMEM;
2080       }
2081     } else {
2082       return JNI_ENOMEM;
2083     }
2084   }
2085   return JNI_OK;
2086 }
2087 
2088 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2089 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2090   // The min and max sizes match the values in globals.hpp, but scaled
2091   // with K. The values have been chosen so that alignment with page
2092   // size doesn't change the max value, which makes the conversions
2093   // back and forth between Xss value and ThreadStackSize value easier.
2094   // The values have also been chosen to fit inside a 32-bit signed type.
2095   const julong min_ThreadStackSize = 0;
2096   const julong max_ThreadStackSize = 1 * M;
2097 
2098   // Make sure the above values match the range set in globals.hpp
2099   const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2100   assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2101   assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2102 
2103   const julong min_size = min_ThreadStackSize * K;
2104   const julong max_size = max_ThreadStackSize * K;
2105 
2106   assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2107 
2108   julong size = 0;
2109   ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2110   if (errcode != arg_in_range) {
2111     bool silent = (option == nullptr); // Allow testing to silence error messages
2112     if (!silent) {
2113       jio_fprintf(defaultStream::error_stream(),
2114                   "Invalid thread stack size: %s\n", option->optionString);
2115       describe_range_error(errcode);
2116     }
2117     return JNI_EINVAL;
2118   }
2119 
2120   // Internally track ThreadStackSize in units of 1024 bytes.
2121   const julong size_aligned = align_up(size, K);
2122   assert(size <= size_aligned,
2123          "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2124          size, size_aligned);
2125 
2126   const julong size_in_K = size_aligned / K;
2127   assert(size_in_K < (julong)max_intx,
2128          "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2129          size_in_K);
2130 
2131   // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2132   const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2133   assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2134          "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2135          max_expanded, size_in_K);
2136 
2137   *out_ThreadStackSize = (intx)size_in_K;
2138 
2139   return JNI_OK;
2140 }
2141 
2142 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {
2143   // For match_option to return remaining or value part of option string
2144   const char* tail;
2145 
2146   // iterate over arguments
2147   for (int index = 0; index < args->nOptions; index++) {
2148     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2149 
2150     const JavaVMOption* option = args->options + index;
2151 
2152     if (!match_option(option, "-Djava.class.path", &tail) &&
2153         !match_option(option, "-Dsun.java.command", &tail) &&
2154         !match_option(option, "-Dsun.java.launcher", &tail)) {
2155 
2156         // add all jvm options to the jvm_args string. This string
2157         // is used later to set the java.vm.args PerfData string constant.
2158         // the -Djava.class.path and the -Dsun.java.command options are
2159         // omitted from jvm_args string as each have their own PerfData
2160         // string constant object.
2161         build_jvm_args(option->optionString);
2162     }
2163 
2164     // -verbose:[class/module/gc/jni]
2165     if (match_option(option, "-verbose", &tail)) {
2166       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2167         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2168         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2169       } else if (!strcmp(tail, ":module")) {
2170         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2171         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2172       } else if (!strcmp(tail, ":gc")) {
2173         if (_legacyGCLogging.lastFlag == 0) {
2174           _legacyGCLogging.lastFlag = 1;
2175         }
2176       } else if (!strcmp(tail, ":jni")) {
2177         LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2178       }
2179     // -da / -ea / -disableassertions / -enableassertions
2180     // These accept an optional class/package name separated by a colon, e.g.,
2181     // -da:java.lang.Thread.
2182     } else if (match_option(option, user_assertion_options, &tail, true)) {
2183       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2184       if (*tail == '\0') {
2185         JavaAssertions::setUserClassDefault(enable);
2186       } else {
2187         assert(*tail == ':', "bogus match by match_option()");
2188         JavaAssertions::addOption(tail + 1, enable);
2189       }
2190     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2191     } else if (match_option(option, system_assertion_options, &tail, false)) {
2192       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2193       JavaAssertions::setSystemClassDefault(enable);
2194     // -bootclasspath:
2195     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2196         jio_fprintf(defaultStream::output_stream(),
2197           "-Xbootclasspath is no longer a supported option.\n");
2198         return JNI_EINVAL;
2199     // -bootclasspath/a:
2200     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2201       Arguments::append_sysclasspath(tail);
2202     // -bootclasspath/p:
2203     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2204         jio_fprintf(defaultStream::output_stream(),
2205           "-Xbootclasspath/p is no longer a supported option.\n");
2206         return JNI_EINVAL;
2207     // -Xrun
2208     } else if (match_option(option, "-Xrun", &tail)) {
2209       if (tail != nullptr) {
2210         const char* pos = strchr(tail, ':');
2211         size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2212         char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2213         jio_snprintf(name, len + 1, "%s", tail);
2214 
2215         char *options = nullptr;
2216         if(pos != nullptr) {
2217           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2218           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2219         }
2220 #if !INCLUDE_JVMTI
2221         if (strcmp(name, "jdwp") == 0) {
2222           jio_fprintf(defaultStream::error_stream(),
2223             "Debugging agents are not supported in this VM\n");
2224           return JNI_ERR;
2225         }
2226 #endif // !INCLUDE_JVMTI
2227         JvmtiAgentList::add_xrun(name, options, false);
2228         FREE_C_HEAP_ARRAY(char, name);
2229         FREE_C_HEAP_ARRAY(char, options);
2230       }
2231     } else if (match_option(option, "--add-reads=", &tail)) {
2232       if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2233         return JNI_ENOMEM;
2234       }
2235     } else if (match_option(option, "--add-exports=", &tail)) {
2236       if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2237         return JNI_ENOMEM;
2238       }
2239     } else if (match_option(option, "--add-opens=", &tail)) {
2240       if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2241         return JNI_ENOMEM;
2242       }
2243     } else if (match_option(option, "--add-modules=", &tail)) {
2244       if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2245         return JNI_ENOMEM;
2246       }
2247     } else if (match_option(option, "--enable-native-access=", &tail)) {
2248       if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2249         return JNI_ENOMEM;
2250       }
2251     } else if (match_option(option, "--illegal-native-access=", &tail)) {
2252       if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2253         return JNI_ENOMEM;
2254       }
2255     } else if (match_option(option, "--limit-modules=", &tail)) {
2256       if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2257         return JNI_ENOMEM;
2258       }
2259     } else if (match_option(option, "--module-path=", &tail)) {
2260       if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2261         return JNI_ENOMEM;
2262       }
2263     } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2264       if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2265         return JNI_ENOMEM;
2266       }
2267     } else if (match_option(option, "--patch-module=", &tail)) {
2268       // --patch-module=<module>=<file>(<pathsep><file>)*
2269       int res = process_patch_mod_option(tail, patch_mod_javabase);
2270       if (res != JNI_OK) {
2271         return res;
2272       }
2273     } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2274       if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2275         PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2276                                 AddProperty, WriteableProperty, InternalProperty);
2277       } else {
2278         jio_fprintf(defaultStream::error_stream(),
2279                     "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2280         return JNI_ERR;
2281       }
2282     } else if (match_option(option, "--illegal-access=", &tail)) {
2283       char version[256];
2284       JDK_Version::jdk(17).to_string(version, sizeof(version));
2285       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2286     // -agentlib and -agentpath
2287     } else if (match_option(option, "-agentlib:", &tail) ||
2288           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2289       if(tail != nullptr) {
2290         const char* pos = strchr(tail, '=');
2291         char* name;
2292         if (pos == nullptr) {
2293           name = os::strdup_check_oom(tail, mtArguments);
2294         } else {
2295           size_t len = pos - tail;
2296           name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2297           memcpy(name, tail, len);
2298           name[len] = '\0';
2299         }
2300 
2301         char *options = nullptr;
2302         if(pos != nullptr) {
2303           options = os::strdup_check_oom(pos + 1, mtArguments);
2304         }
2305 #if !INCLUDE_JVMTI
2306         if (valid_jdwp_agent(name, is_absolute_path)) {
2307           jio_fprintf(defaultStream::error_stream(),
2308             "Debugging agents are not supported in this VM\n");
2309           return JNI_ERR;
2310         }
2311 #endif // !INCLUDE_JVMTI
2312         JvmtiAgentList::add(name, options, is_absolute_path);
2313         os::free(name);
2314         os::free(options);
2315       }
2316     // -javaagent
2317     } else if (match_option(option, "-javaagent:", &tail)) {
2318 #if !INCLUDE_JVMTI
2319       jio_fprintf(defaultStream::error_stream(),
2320         "Instrumentation agents are not supported in this VM\n");
2321       return JNI_ERR;
2322 #else
2323       if (tail != nullptr) {
2324         size_t length = strlen(tail) + 1;
2325         char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2326         jio_snprintf(options, length, "%s", tail);
2327         JvmtiAgentList::add("instrument", options, false);
2328         FREE_C_HEAP_ARRAY(char, options);
2329 
2330         // java agents need module java.instrument
2331         if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2332           return JNI_ENOMEM;
2333         }
2334       }
2335 #endif // !INCLUDE_JVMTI
2336     // --enable_preview
2337     } else if (match_option(option, "--enable-preview")) {
2338       set_enable_preview();
2339     // -Xnoclassgc
2340     } else if (match_option(option, "-Xnoclassgc")) {
2341       if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2342         return JNI_EINVAL;
2343       }
2344     // -Xbatch
2345     } else if (match_option(option, "-Xbatch")) {
2346       if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2347         return JNI_EINVAL;
2348       }
2349     // -Xmn for compatibility with other JVM vendors
2350     } else if (match_option(option, "-Xmn", &tail)) {
2351       julong long_initial_young_size = 0;
2352       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2353       if (errcode != arg_in_range) {
2354         jio_fprintf(defaultStream::error_stream(),
2355                     "Invalid initial young generation size: %s\n", option->optionString);
2356         describe_range_error(errcode);
2357         return JNI_EINVAL;
2358       }
2359       if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2360         return JNI_EINVAL;
2361       }
2362       if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2363         return JNI_EINVAL;
2364       }
2365     // -Xms
2366     } else if (match_option(option, "-Xms", &tail)) {
2367       julong size = 0;
2368       // an initial heap size of 0 means automatically determine
2369       ArgsRange errcode = parse_memory_size(tail, &size, 0);
2370       if (errcode != arg_in_range) {
2371         jio_fprintf(defaultStream::error_stream(),
2372                     "Invalid initial heap size: %s\n", option->optionString);
2373         describe_range_error(errcode);
2374         return JNI_EINVAL;
2375       }
2376       if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2377         return JNI_EINVAL;
2378       }
2379       if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2380         return JNI_EINVAL;
2381       }
2382     // -Xmx
2383     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2384       julong long_max_heap_size = 0;
2385       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2386       if (errcode != arg_in_range) {
2387         jio_fprintf(defaultStream::error_stream(),
2388                     "Invalid maximum heap size: %s\n", option->optionString);
2389         describe_range_error(errcode);
2390         return JNI_EINVAL;
2391       }
2392       if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2393         return JNI_EINVAL;
2394       }
2395     // Xmaxf
2396     } else if (match_option(option, "-Xmaxf", &tail)) {
2397       char* err;
2398       int maxf = (int)(strtod(tail, &err) * 100);
2399       if (*err != '\0' || *tail == '\0') {
2400         jio_fprintf(defaultStream::error_stream(),
2401                     "Bad max heap free percentage size: %s\n",
2402                     option->optionString);
2403         return JNI_EINVAL;
2404       } else {
2405         if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2406             return JNI_EINVAL;
2407         }
2408       }
2409     // Xminf
2410     } else if (match_option(option, "-Xminf", &tail)) {
2411       char* err;
2412       int minf = (int)(strtod(tail, &err) * 100);
2413       if (*err != '\0' || *tail == '\0') {
2414         jio_fprintf(defaultStream::error_stream(),
2415                     "Bad min heap free percentage size: %s\n",
2416                     option->optionString);
2417         return JNI_EINVAL;
2418       } else {
2419         if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2420           return JNI_EINVAL;
2421         }
2422       }
2423     // -Xss
2424     } else if (match_option(option, "-Xss", &tail)) {
2425       intx value = 0;
2426       jint err = parse_xss(option, tail, &value);
2427       if (err != JNI_OK) {
2428         return err;
2429       }
2430       if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2431         return JNI_EINVAL;
2432       }
2433     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2434                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2435       julong long_ReservedCodeCacheSize = 0;
2436 
2437       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2438       if (errcode != arg_in_range) {
2439         jio_fprintf(defaultStream::error_stream(),
2440                     "Invalid maximum code cache size: %s.\n", option->optionString);
2441         return JNI_EINVAL;
2442       }
2443       if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2444         return JNI_EINVAL;
2445       }
2446     // -green
2447     } else if (match_option(option, "-green")) {
2448       jio_fprintf(defaultStream::error_stream(),
2449                   "Green threads support not available\n");
2450           return JNI_EINVAL;
2451     // -native
2452     } else if (match_option(option, "-native")) {
2453           // HotSpot always uses native threads, ignore silently for compatibility
2454     // -Xrs
2455     } else if (match_option(option, "-Xrs")) {
2456           // Classic/EVM option, new functionality
2457       if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2458         return JNI_EINVAL;
2459       }
2460       // -Xprof
2461     } else if (match_option(option, "-Xprof")) {
2462       char version[256];
2463       // Obsolete in JDK 10
2464       JDK_Version::jdk(10).to_string(version, sizeof(version));
2465       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2466     // -Xinternalversion
2467     } else if (match_option(option, "-Xinternalversion")) {
2468       jio_fprintf(defaultStream::output_stream(), "%s\n",
2469                   VM_Version::internal_vm_info_string());
2470       vm_exit(0);
2471 #ifndef PRODUCT
2472     // -Xprintflags
2473     } else if (match_option(option, "-Xprintflags")) {
2474       JVMFlag::printFlags(tty, false);
2475       vm_exit(0);
2476 #endif
2477     // -D
2478     } else if (match_option(option, "-D", &tail)) {
2479       const char* value;
2480       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2481             *value!= '\0' && strcmp(value, "\"\"") != 0) {
2482         // abort if -Djava.endorsed.dirs is set
2483         jio_fprintf(defaultStream::output_stream(),
2484           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2485           "in modular form will be supported via the concept of upgradeable modules.\n", value);
2486         return JNI_EINVAL;
2487       }
2488       if (match_option(option, "-Djava.ext.dirs=", &value) &&
2489             *value != '\0' && strcmp(value, "\"\"") != 0) {
2490         // abort if -Djava.ext.dirs is set
2491         jio_fprintf(defaultStream::output_stream(),
2492           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
2493         return JNI_EINVAL;
2494       }
2495       // Check for module related properties.  They must be set using the modules
2496       // options. For example: use "--add-modules=java.sql", not
2497       // "-Djdk.module.addmods=java.sql"
2498       if (is_internal_module_property(option->optionString + 2)) {
2499         needs_module_property_warning = true;
2500         continue;
2501       }
2502       if (!add_property(tail)) {
2503         return JNI_ENOMEM;
2504       }
2505       // Out of the box management support
2506       if (match_option(option, "-Dcom.sun.management", &tail)) {
2507 #if INCLUDE_MANAGEMENT
2508         if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2509           return JNI_EINVAL;
2510         }
2511         // management agent in module jdk.management.agent
2512         if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2513           return JNI_ENOMEM;
2514         }
2515 #else
2516         jio_fprintf(defaultStream::output_stream(),
2517           "-Dcom.sun.management is not supported in this VM.\n");
2518         return JNI_ERR;
2519 #endif
2520       }
2521     // -Xint
2522     } else if (match_option(option, "-Xint")) {
2523           set_mode_flags(_int);
2524           mode_flag_cmd_line = true;
2525     // -Xmixed
2526     } else if (match_option(option, "-Xmixed")) {
2527           set_mode_flags(_mixed);
2528           mode_flag_cmd_line = true;
2529     // -Xcomp
2530     } else if (match_option(option, "-Xcomp")) {
2531       // for testing the compiler; turn off all flags that inhibit compilation
2532           set_mode_flags(_comp);
2533           mode_flag_cmd_line = true;
2534     // -Xshare:dump
2535     } else if (match_option(option, "-Xshare:dump")) {
2536       CDSConfig::enable_dumping_static_archive();
2537       CDSConfig::set_old_cds_flags_used();
2538     // -Xshare:on
2539     } else if (match_option(option, "-Xshare:on")) {
2540       UseSharedSpaces = true;
2541       RequireSharedSpaces = true;
2542       CDSConfig::set_old_cds_flags_used();
2543     // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2544     } else if (match_option(option, "-Xshare:auto")) {
2545       UseSharedSpaces = true;
2546       RequireSharedSpaces = false;
2547       xshare_auto_cmd_line = true;
2548       CDSConfig::set_old_cds_flags_used();
2549     // -Xshare:off
2550     } else if (match_option(option, "-Xshare:off")) {
2551       UseSharedSpaces = false;
2552       RequireSharedSpaces = false;
2553       CDSConfig::set_old_cds_flags_used();
2554     // -Xverify
2555     } else if (match_option(option, "-Xverify", &tail)) {
2556       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2557         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2558           return JNI_EINVAL;
2559         }
2560         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2561           return JNI_EINVAL;
2562         }
2563       } else if (strcmp(tail, ":remote") == 0) {
2564         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2565           return JNI_EINVAL;
2566         }
2567         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2568           return JNI_EINVAL;
2569         }
2570       } else if (strcmp(tail, ":none") == 0) {
2571         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2572           return JNI_EINVAL;
2573         }
2574         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2575           return JNI_EINVAL;
2576         }
2577         warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2578       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2579         return JNI_EINVAL;
2580       }
2581     // -Xdebug
2582     } else if (match_option(option, "-Xdebug")) {
2583       warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2584     } else if (match_option(option, "-Xloggc:", &tail)) {
2585       // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2586       log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2587       _legacyGCLogging.lastFlag = 2;
2588       _legacyGCLogging.file = os::strdup_check_oom(tail);
2589     } else if (match_option(option, "-Xlog", &tail)) {
2590       bool ret = false;
2591       if (strcmp(tail, ":help") == 0) {
2592         fileStream stream(defaultStream::output_stream());
2593         LogConfiguration::print_command_line_help(&stream);
2594         vm_exit(0);
2595       } else if (strcmp(tail, ":disable") == 0) {
2596         LogConfiguration::disable_logging();
2597         ret = true;
2598       } else if (strcmp(tail, ":async") == 0) {
2599         LogConfiguration::set_async_mode(true);
2600         ret = true;
2601       } else if (*tail == '\0') {
2602         ret = LogConfiguration::parse_command_line_arguments();
2603         assert(ret, "-Xlog without arguments should never fail to parse");
2604       } else if (*tail == ':') {
2605         ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2606       }
2607       if (ret == false) {
2608         jio_fprintf(defaultStream::error_stream(),
2609                     "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2610                     tail);
2611         return JNI_EINVAL;
2612       }
2613     // JNI hooks
2614     } else if (match_option(option, "-Xcheck", &tail)) {
2615       if (!strcmp(tail, ":jni")) {
2616 #if !INCLUDE_JNI_CHECK
2617         warning("JNI CHECKING is not supported in this VM");
2618 #else
2619         CheckJNICalls = true;
2620 #endif // INCLUDE_JNI_CHECK
2621       } else if (is_bad_option(option, args->ignoreUnrecognized,
2622                                      "check")) {
2623         return JNI_EINVAL;
2624       }
2625     } else if (match_option(option, "vfprintf")) {
2626       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2627     } else if (match_option(option, "exit")) {
2628       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2629     } else if (match_option(option, "abort")) {
2630       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2631     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2632     // and the last option wins.
2633     } else if (match_option(option, "-XX:+NeverTenure")) {
2634       if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2635         return JNI_EINVAL;
2636       }
2637       if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2638         return JNI_EINVAL;
2639       }
2640       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2641         return JNI_EINVAL;
2642       }
2643     } else if (match_option(option, "-XX:+AlwaysTenure")) {
2644       if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2645         return JNI_EINVAL;
2646       }
2647       if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2648         return JNI_EINVAL;
2649       }
2650       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2651         return JNI_EINVAL;
2652       }
2653     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2654       uint max_tenuring_thresh = 0;
2655       if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2656         jio_fprintf(defaultStream::error_stream(),
2657                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2658         return JNI_EINVAL;
2659       }
2660 
2661       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2662         return JNI_EINVAL;
2663       }
2664 
2665       if (MaxTenuringThreshold == 0) {
2666         if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2667           return JNI_EINVAL;
2668         }
2669         if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2670           return JNI_EINVAL;
2671         }
2672       } else {
2673         if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2674           return JNI_EINVAL;
2675         }
2676         if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2677           return JNI_EINVAL;
2678         }
2679       }
2680     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2681       if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2682         return JNI_EINVAL;
2683       }
2684       if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2685         return JNI_EINVAL;
2686       }
2687     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2688       if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2689         return JNI_EINVAL;
2690       }
2691       if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2692         return JNI_EINVAL;
2693       }
2694     } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2695       if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2696         return JNI_EINVAL;
2697       }
2698       if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2699         return JNI_EINVAL;
2700       }
2701     } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2702       if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2703         return JNI_EINVAL;
2704       }
2705       if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2706         return JNI_EINVAL;
2707       }
2708     } else if (match_option(option, "--finalization=", &tail)) {
2709       if (strcmp(tail, "enabled") == 0) {
2710         InstanceKlass::set_finalization_enabled(true);
2711       } else if (strcmp(tail, "disabled") == 0) {
2712         InstanceKlass::set_finalization_enabled(false);
2713       } else {
2714         jio_fprintf(defaultStream::error_stream(),
2715                     "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2716                     tail);
2717         return JNI_EINVAL;
2718       }
2719 #if !defined(DTRACE_ENABLED)
2720     } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2721       jio_fprintf(defaultStream::error_stream(),
2722                   "DTraceMethodProbes flag is not applicable for this configuration\n");
2723       return JNI_EINVAL;
2724     } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2725       jio_fprintf(defaultStream::error_stream(),
2726                   "DTraceAllocProbes flag is not applicable for this configuration\n");
2727       return JNI_EINVAL;
2728     } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2729       jio_fprintf(defaultStream::error_stream(),
2730                   "DTraceMonitorProbes flag is not applicable for this configuration\n");
2731       return JNI_EINVAL;
2732 #endif // !defined(DTRACE_ENABLED)
2733 #ifdef ASSERT
2734     } else if (match_option(option, "-XX:+FullGCALot")) {
2735       if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2736         return JNI_EINVAL;
2737       }
2738 #endif
2739 #if !INCLUDE_MANAGEMENT
2740     } else if (match_option(option, "-XX:+ManagementServer")) {
2741         jio_fprintf(defaultStream::error_stream(),
2742           "ManagementServer is not supported in this VM.\n");
2743         return JNI_ERR;
2744 #endif // INCLUDE_MANAGEMENT
2745 #if INCLUDE_JVMCI
2746     } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2747       if (EnableJVMCIProduct) {
2748         jio_fprintf(defaultStream::error_stream(),
2749                   "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2750         return JNI_EINVAL;
2751       }
2752     } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2753       bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2754       if (use_graal_jit) {
2755         const char* jvmci_compiler = get_property("jvmci.Compiler");
2756         if (jvmci_compiler != nullptr) {
2757           if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2758             jio_fprintf(defaultStream::error_stream(),
2759               "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2760             return JNI_ERR;
2761           }
2762         } else if (!add_property("jvmci.Compiler=graal")) {
2763             return JNI_ENOMEM;
2764         }
2765       }
2766 
2767       // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2768       if (EnableJVMCIProduct) {
2769         continue;
2770       }
2771       JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2772       // Allow this flag if it has been unlocked.
2773       if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2774         if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2775           jio_fprintf(defaultStream::error_stream(),
2776             "Unable to enable JVMCI in product mode\n");
2777           return JNI_ERR;
2778         }
2779       }
2780       // The flag was locked so process normally to report that error
2781       else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2782         return JNI_EINVAL;
2783       }
2784 #endif // INCLUDE_JVMCI
2785 #if INCLUDE_JFR
2786     } else if (match_jfr_option(&option)) {
2787       return JNI_EINVAL;
2788 #endif
2789     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2790       // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2791       // already been handled
2792       if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2793           (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2794         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2795           return JNI_EINVAL;
2796         }
2797       }
2798     // Unknown option
2799     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2800       return JNI_ERR;
2801     }
2802   }
2803 
2804   // PrintSharedArchiveAndExit will turn on
2805   //   -Xshare:on
2806   //   -Xlog:class+path=info
2807   if (PrintSharedArchiveAndExit) {
2808     UseSharedSpaces = true;
2809     RequireSharedSpaces = true;
2810     LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2811   }
2812 
2813   fix_appclasspath();
2814 
2815   return JNI_OK;
2816 }
2817 
2818 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
2819   // For java.base check for duplicate --patch-module options being specified on the command line.
2820   // This check is only required for java.base, all other duplicate module specifications
2821   // will be checked during module system initialization.  The module system initialization
2822   // will throw an ExceptionInInitializerError if this situation occurs.
2823   if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2824     if (*patch_mod_javabase) {
2825       vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2826     } else {
2827       *patch_mod_javabase = true;
2828     }
2829   }
2830 
2831   // Create GrowableArray lazily, only if --patch-module has been specified
2832   if (_patch_mod_prefix == nullptr) {
2833     _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2834   }
2835 
2836   _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2837 }
2838 
2839 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2840 //
2841 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2842 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2843 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2844 // path is treated as the current directory.
2845 //
2846 // This causes problems with CDS, which requires that all directories specified in the classpath
2847 // must be empty. In most cases, applications do NOT want to load classes from the current
2848 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2849 // scripts compatible with CDS.
2850 void Arguments::fix_appclasspath() {
2851   if (IgnoreEmptyClassPaths) {
2852     const char separator = *os::path_separator();
2853     const char* src = _java_class_path->value();
2854 
2855     // skip over all the leading empty paths
2856     while (*src == separator) {
2857       src ++;
2858     }
2859 
2860     char* copy = os::strdup_check_oom(src, mtArguments);
2861 
2862     // trim all trailing empty paths
2863     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2864       *tail = '\0';
2865     }
2866 
2867     char from[3] = {separator, separator, '\0'};
2868     char to  [2] = {separator, '\0'};
2869     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2870       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2871       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2872     }
2873 
2874     _java_class_path->set_writeable_value(copy);
2875     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2876   }
2877 }
2878 
2879 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
2880   // check if the default lib/endorsed directory exists; if so, error
2881   char path[JVM_MAXPATHLEN];
2882   const char* fileSep = os::file_separator();
2883   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2884 
2885   DIR* dir = os::opendir(path);
2886   if (dir != nullptr) {
2887     jio_fprintf(defaultStream::output_stream(),
2888       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2889       "in modular form will be supported via the concept of upgradeable modules.\n");
2890     os::closedir(dir);
2891     return JNI_ERR;
2892   }
2893 
2894   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2895   dir = os::opendir(path);
2896   if (dir != nullptr) {
2897     jio_fprintf(defaultStream::output_stream(),
2898       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2899       "Use -classpath instead.\n.");
2900     os::closedir(dir);
2901     return JNI_ERR;
2902   }
2903 
2904   // This must be done after all arguments have been processed
2905   // and the container support has been initialized since AggressiveHeap
2906   // relies on the amount of total memory available.
2907   if (AggressiveHeap) {
2908     jint result = set_aggressive_heap_flags();
2909     if (result != JNI_OK) {
2910       return result;
2911     }
2912   }
2913 
2914   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2915   // but like -Xint, leave compilation thresholds unaffected.
2916   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2917   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2918     set_mode_flags(_int);
2919   }
2920 
2921 #ifdef ZERO
2922   // Zero always runs in interpreted mode
2923   set_mode_flags(_int);
2924 #endif
2925 
2926   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2927   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2928     FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2929   }
2930 
2931 #if !COMPILER2_OR_JVMCI
2932   // Don't degrade server performance for footprint
2933   if (FLAG_IS_DEFAULT(UseLargePages) &&
2934       MaxHeapSize < LargePageHeapSizeThreshold) {
2935     // No need for large granularity pages w/small heaps.
2936     // Note that large pages are enabled/disabled for both the
2937     // Java heap and the code cache.
2938     FLAG_SET_DEFAULT(UseLargePages, false);
2939   }
2940 
2941   UNSUPPORTED_OPTION(ProfileInterpreter);
2942 #endif
2943 
2944   // Parse the CompilationMode flag
2945   if (!CompilationModeFlag::initialize()) {
2946     return JNI_ERR;
2947   }
2948 
2949   if (!check_vm_args_consistency()) {
2950     return JNI_ERR;
2951   }
2952 
2953   if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
2954     return JNI_ERR;
2955   }
2956 




2957 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2958   UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2959 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2960 
2961   return JNI_OK;
2962 }
2963 
2964 // Helper class for controlling the lifetime of JavaVMInitArgs
2965 // objects.  The contents of the JavaVMInitArgs are guaranteed to be
2966 // deleted on the destruction of the ScopedVMInitArgs object.
2967 class ScopedVMInitArgs : public StackObj {
2968  private:
2969   JavaVMInitArgs _args;
2970   char*          _container_name;
2971   bool           _is_set;
2972   char*          _vm_options_file_arg;
2973 
2974  public:
2975   ScopedVMInitArgs(const char *container_name) {
2976     _args.version = JNI_VERSION_1_2;
2977     _args.nOptions = 0;
2978     _args.options = nullptr;
2979     _args.ignoreUnrecognized = false;
2980     _container_name = (char *)container_name;
2981     _is_set = false;
2982     _vm_options_file_arg = nullptr;
2983   }
2984 
2985   // Populates the JavaVMInitArgs object represented by this
2986   // ScopedVMInitArgs object with the arguments in options.  The
2987   // allocated memory is deleted by the destructor.  If this method
2988   // returns anything other than JNI_OK, then this object is in a
2989   // partially constructed state, and should be abandoned.
2990   jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2991     _is_set = true;
2992     JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2993         JavaVMOption, options->length(), mtArguments);
2994     if (options_arr == nullptr) {
2995       return JNI_ENOMEM;
2996     }
2997     _args.options = options_arr;
2998 
2999     for (int i = 0; i < options->length(); i++) {
3000       options_arr[i] = options->at(i);
3001       options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3002       if (options_arr[i].optionString == nullptr) {
3003         // Rely on the destructor to do cleanup.
3004         _args.nOptions = i;
3005         return JNI_ENOMEM;
3006       }
3007     }
3008 
3009     _args.nOptions = options->length();
3010     _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3011     return JNI_OK;
3012   }
3013 
3014   JavaVMInitArgs* get()             { return &_args; }
3015   char* container_name()            { return _container_name; }
3016   bool  is_set()                    { return _is_set; }
3017   bool  found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3018   char* vm_options_file_arg()       { return _vm_options_file_arg; }
3019 
3020   void set_vm_options_file_arg(const char *vm_options_file_arg) {
3021     if (_vm_options_file_arg != nullptr) {
3022       os::free(_vm_options_file_arg);
3023     }
3024     _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3025   }
3026 
3027   ~ScopedVMInitArgs() {
3028     if (_vm_options_file_arg != nullptr) {
3029       os::free(_vm_options_file_arg);
3030     }
3031     if (_args.options == nullptr) return;
3032     for (int i = 0; i < _args.nOptions; i++) {
3033       os::free(_args.options[i].optionString);
3034     }
3035     FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3036   }
3037 
3038   // Insert options into this option list, to replace option at
3039   // vm_options_file_pos (-XX:VMOptionsFile)
3040   jint insert(const JavaVMInitArgs* args,
3041               const JavaVMInitArgs* args_to_insert,
3042               const int vm_options_file_pos) {
3043     assert(_args.options == nullptr, "shouldn't be set yet");
3044     assert(args_to_insert->nOptions != 0, "there should be args to insert");
3045     assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3046 
3047     int length = args->nOptions + args_to_insert->nOptions - 1;
3048     // Construct new option array
3049     GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3050     for (int i = 0; i < args->nOptions; i++) {
3051       if (i == vm_options_file_pos) {
3052         // insert the new options starting at the same place as the
3053         // -XX:VMOptionsFile option
3054         for (int j = 0; j < args_to_insert->nOptions; j++) {
3055           options.push(args_to_insert->options[j]);
3056         }
3057       } else {
3058         options.push(args->options[i]);
3059       }
3060     }
3061     // make into options array
3062     return set_args(&options);
3063   }
3064 };
3065 
3066 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3067   return parse_options_environment_variable("_JAVA_OPTIONS", args);
3068 }
3069 
3070 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3071   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3072 }
3073 
3074 jint Arguments::parse_options_environment_variable(const char* name,
3075                                                    ScopedVMInitArgs* vm_args) {
3076   char *buffer = ::getenv(name);
3077 
3078   // Don't check this environment variable if user has special privileges
3079   // (e.g. unix su command).
3080   if (buffer == nullptr || os::have_special_privileges()) {
3081     return JNI_OK;
3082   }
3083 
3084   if ((buffer = os::strdup(buffer)) == nullptr) {
3085     return JNI_ENOMEM;
3086   }
3087 
3088   jio_fprintf(defaultStream::error_stream(),
3089               "Picked up %s: %s\n", name, buffer);
3090 
3091   int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3092 
3093   os::free(buffer);
3094   return retcode;
3095 }
3096 
3097 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3098   // read file into buffer
3099   int fd = ::open(file_name, O_RDONLY);
3100   if (fd < 0) {
3101     jio_fprintf(defaultStream::error_stream(),
3102                 "Could not open options file '%s'\n",
3103                 file_name);
3104     return JNI_ERR;
3105   }
3106 
3107   struct stat stbuf;
3108   int retcode = os::stat(file_name, &stbuf);
3109   if (retcode != 0) {
3110     jio_fprintf(defaultStream::error_stream(),
3111                 "Could not stat options file '%s'\n",
3112                 file_name);
3113     ::close(fd);
3114     return JNI_ERR;
3115   }
3116 
3117   if (stbuf.st_size == 0) {
3118     // tell caller there is no option data and that is ok
3119     ::close(fd);
3120     return JNI_OK;
3121   }
3122 
3123   // '+ 1' for null termination even with max bytes
3124   size_t bytes_alloc = stbuf.st_size + 1;
3125 
3126   char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3127   if (nullptr == buf) {
3128     jio_fprintf(defaultStream::error_stream(),
3129                 "Could not allocate read buffer for options file parse\n");
3130     ::close(fd);
3131     return JNI_ENOMEM;
3132   }
3133 
3134   memset(buf, 0, bytes_alloc);
3135 
3136   // Fill buffer
3137   ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3138   ::close(fd);
3139   if (bytes_read < 0) {
3140     FREE_C_HEAP_ARRAY(char, buf);
3141     jio_fprintf(defaultStream::error_stream(),
3142                 "Could not read options file '%s'\n", file_name);
3143     return JNI_ERR;
3144   }
3145 
3146   if (bytes_read == 0) {
3147     // tell caller there is no option data and that is ok
3148     FREE_C_HEAP_ARRAY(char, buf);
3149     return JNI_OK;
3150   }
3151 
3152   retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3153 
3154   FREE_C_HEAP_ARRAY(char, buf);
3155   return retcode;
3156 }
3157 
3158 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3159   // Construct option array
3160   GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3161 
3162   // some pointers to help with parsing
3163   char *buffer_end = buffer + buf_len;
3164   char *opt_hd = buffer;
3165   char *wrt = buffer;
3166   char *rd = buffer;
3167 
3168   // parse all options
3169   while (rd < buffer_end) {
3170     // skip leading white space from the input string
3171     while (rd < buffer_end && isspace((unsigned char) *rd)) {
3172       rd++;
3173     }
3174 
3175     if (rd >= buffer_end) {
3176       break;
3177     }
3178 
3179     // Remember this is where we found the head of the token.
3180     opt_hd = wrt;
3181 
3182     // Tokens are strings of non white space characters separated
3183     // by one or more white spaces.
3184     while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3185       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3186         int quote = *rd;                    // matching quote to look for
3187         rd++;                               // don't copy open quote
3188         while (rd < buffer_end && *rd != quote) {
3189                                             // include everything (even spaces)
3190                                             // up until the close quote
3191           *wrt++ = *rd++;                   // copy to option string
3192         }
3193 
3194         if (rd < buffer_end) {
3195           rd++;                             // don't copy close quote
3196         } else {
3197                                             // did not see closing quote
3198           jio_fprintf(defaultStream::error_stream(),
3199                       "Unmatched quote in %s\n", name);
3200           return JNI_ERR;
3201         }
3202       } else {
3203         *wrt++ = *rd++;                     // copy to option string
3204       }
3205     }
3206 
3207     // steal a white space character and set it to null
3208     *wrt++ = '\0';
3209     // We now have a complete token
3210 
3211     JavaVMOption option;
3212     option.optionString = opt_hd;
3213     option.extraInfo = nullptr;
3214 
3215     options.append(option);                // Fill in option
3216 
3217     rd++;  // Advance to next character
3218   }
3219 
3220   // Fill out JavaVMInitArgs structure.
3221   return vm_args->set_args(&options);
3222 }
3223 
3224 #ifndef PRODUCT
3225 // Determine whether LogVMOutput should be implicitly turned on.
3226 static bool use_vm_log() {
3227   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3228       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3229       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3230       PrintAssembly || TraceDeoptimization ||
3231       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3232     return true;
3233   }
3234 
3235 #ifdef COMPILER1
3236   if (PrintC1Statistics) {
3237     return true;
3238   }
3239 #endif // COMPILER1
3240 
3241 #ifdef COMPILER2
3242   if (PrintOptoAssembly || PrintOptoStatistics) {
3243     return true;
3244   }
3245 #endif // COMPILER2
3246 
3247   return false;
3248 }
3249 
3250 #endif // PRODUCT
3251 
3252 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3253   for (int index = 0; index < args->nOptions; index++) {
3254     const JavaVMOption* option = args->options + index;
3255     const char* tail;
3256     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3257       return true;
3258     }
3259   }
3260   return false;
3261 }
3262 
3263 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3264                                        const char* vm_options_file,
3265                                        const int vm_options_file_pos,
3266                                        ScopedVMInitArgs* vm_options_file_args,
3267                                        ScopedVMInitArgs* args_out) {
3268   jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3269   if (code != JNI_OK) {
3270     return code;
3271   }
3272 
3273   if (vm_options_file_args->get()->nOptions < 1) {
3274     return JNI_OK;
3275   }
3276 
3277   if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3278     jio_fprintf(defaultStream::error_stream(),
3279                 "A VM options file may not refer to a VM options file. "
3280                 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3281                 "options file '%s' in options container '%s' is an error.\n",
3282                 vm_options_file_args->vm_options_file_arg(),
3283                 vm_options_file_args->container_name());
3284     return JNI_EINVAL;
3285   }
3286 
3287   return args_out->insert(args, vm_options_file_args->get(),
3288                           vm_options_file_pos);
3289 }
3290 
3291 // Expand -XX:VMOptionsFile found in args_in as needed.
3292 // mod_args and args_out parameters may return values as needed.
3293 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3294                                             ScopedVMInitArgs* mod_args,
3295                                             JavaVMInitArgs** args_out) {
3296   jint code = match_special_option_and_act(args_in, mod_args);
3297   if (code != JNI_OK) {
3298     return code;
3299   }
3300 
3301   if (mod_args->is_set()) {
3302     // args_in contains -XX:VMOptionsFile and mod_args contains the
3303     // original options from args_in along with the options expanded
3304     // from the VMOptionsFile. Return a short-hand to the caller.
3305     *args_out = mod_args->get();
3306   } else {
3307     *args_out = (JavaVMInitArgs *)args_in;  // no changes so use args_in
3308   }
3309   return JNI_OK;
3310 }
3311 
3312 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3313                                              ScopedVMInitArgs* args_out) {
3314   // Remaining part of option string
3315   const char* tail;
3316   ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3317 
3318   for (int index = 0; index < args->nOptions; index++) {
3319     const JavaVMOption* option = args->options + index;
3320     if (match_option(option, "-XX:Flags=", &tail)) {
3321       Arguments::set_jvm_flags_file(tail);
3322       continue;
3323     }
3324     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3325       if (vm_options_file_args.found_vm_options_file_arg()) {
3326         jio_fprintf(defaultStream::error_stream(),
3327                     "The option '%s' is already specified in the options "
3328                     "container '%s' so the specification of '%s' in the "
3329                     "same options container is an error.\n",
3330                     vm_options_file_args.vm_options_file_arg(),
3331                     vm_options_file_args.container_name(),
3332                     option->optionString);
3333         return JNI_EINVAL;
3334       }
3335       vm_options_file_args.set_vm_options_file_arg(option->optionString);
3336       // If there's a VMOptionsFile, parse that
3337       jint code = insert_vm_options_file(args, tail, index,
3338                                          &vm_options_file_args, args_out);
3339       if (code != JNI_OK) {
3340         return code;
3341       }
3342       args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3343       if (args_out->is_set()) {
3344         // The VMOptions file inserted some options so switch 'args'
3345         // to the new set of options, and continue processing which
3346         // preserves "last option wins" semantics.
3347         args = args_out->get();
3348         // The first option from the VMOptionsFile replaces the
3349         // current option.  So we back track to process the
3350         // replacement option.
3351         index--;
3352       }
3353       continue;
3354     }
3355     if (match_option(option, "-XX:+PrintVMOptions")) {
3356       PrintVMOptions = true;
3357       continue;
3358     }
3359     if (match_option(option, "-XX:-PrintVMOptions")) {
3360       PrintVMOptions = false;
3361       continue;
3362     }
3363     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3364       IgnoreUnrecognizedVMOptions = true;
3365       continue;
3366     }
3367     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3368       IgnoreUnrecognizedVMOptions = false;
3369       continue;
3370     }
3371     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3372       JVMFlag::printFlags(tty, false);
3373       vm_exit(0);
3374     }
3375 
3376 #ifndef PRODUCT
3377     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3378       JVMFlag::printFlags(tty, true);
3379       vm_exit(0);
3380     }
3381 #endif
3382   }
3383   return JNI_OK;
3384 }
3385 
3386 static void print_options(const JavaVMInitArgs *args) {
3387   const char* tail;
3388   for (int index = 0; index < args->nOptions; index++) {
3389     const JavaVMOption *option = args->options + index;
3390     if (match_option(option, "-XX:", &tail)) {
3391       logOption(tail);
3392     }
3393   }
3394 }
3395 
3396 bool Arguments::handle_deprecated_print_gc_flags() {
3397   if (PrintGC) {
3398     log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3399   }
3400   if (PrintGCDetails) {
3401     log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3402   }
3403 
3404   if (_legacyGCLogging.lastFlag == 2) {
3405     // -Xloggc was used to specify a filename
3406     const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3407 
3408     LogTarget(Error, logging) target;
3409     LogStream errstream(target);
3410     return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3411   } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3412     LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3413   }
3414   return true;
3415 }
3416 
3417 static void apply_debugger_ergo() {
3418 #ifdef ASSERT
3419   if (ReplayCompiles) {
3420     FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3421   }
3422 
3423   if (UseDebuggerErgo) {
3424     // Turn on sub-flags
3425     FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3426     FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3427   }
3428 
3429   if (UseDebuggerErgo2) {
3430     // Debugging with limited number of CPUs
3431     FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3432     FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3433     FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3434     FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3435   }
3436 #endif // ASSERT
3437 }
3438 
3439 // Parse entry point called from JNI_CreateJavaVM
3440 
3441 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3442   assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3443   JVMFlag::check_all_flag_declarations();
3444 
3445   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3446   const char* hotspotrc = ".hotspotrc";
3447   bool settings_file_specified = false;
3448   bool needs_hotspotrc_warning = false;
3449   ScopedVMInitArgs initial_vm_options_args("");
3450   ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3451   ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3452 
3453   // Pointers to current working set of containers
3454   JavaVMInitArgs* cur_cmd_args;
3455   JavaVMInitArgs* cur_vm_options_args;
3456   JavaVMInitArgs* cur_java_options_args;
3457   JavaVMInitArgs* cur_java_tool_options_args;
3458 
3459   // Containers for modified/expanded options
3460   ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3461   ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3462   ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3463   ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3464 
3465 
3466   jint code =
3467       parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3468   if (code != JNI_OK) {
3469     return code;
3470   }
3471 
3472   code = parse_java_options_environment_variable(&initial_java_options_args);
3473   if (code != JNI_OK) {
3474     return code;
3475   }
3476 
3477   // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3478   char *vmoptions = ClassLoader::lookup_vm_options();
3479   if (vmoptions != nullptr) {
3480     code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3481     FREE_C_HEAP_ARRAY(char, vmoptions);
3482     if (code != JNI_OK) {
3483       return code;
3484     }
3485   }
3486 
3487   code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3488                                      &mod_java_tool_options_args,
3489                                      &cur_java_tool_options_args);
3490   if (code != JNI_OK) {
3491     return code;
3492   }
3493 
3494   code = expand_vm_options_as_needed(initial_cmd_args,
3495                                      &mod_cmd_args,
3496                                      &cur_cmd_args);
3497   if (code != JNI_OK) {
3498     return code;
3499   }
3500 
3501   code = expand_vm_options_as_needed(initial_java_options_args.get(),
3502                                      &mod_java_options_args,
3503                                      &cur_java_options_args);
3504   if (code != JNI_OK) {
3505     return code;
3506   }
3507 
3508   code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3509                                      &mod_vm_options_args,
3510                                      &cur_vm_options_args);
3511   if (code != JNI_OK) {
3512     return code;
3513   }
3514 
3515   const char* flags_file = Arguments::get_jvm_flags_file();
3516   settings_file_specified = (flags_file != nullptr);
3517 
3518   if (IgnoreUnrecognizedVMOptions) {
3519     cur_cmd_args->ignoreUnrecognized = true;
3520     cur_java_tool_options_args->ignoreUnrecognized = true;
3521     cur_java_options_args->ignoreUnrecognized = true;
3522   }
3523 
3524   // Parse specified settings file
3525   if (settings_file_specified) {
3526     if (!process_settings_file(flags_file, true,
3527                                cur_cmd_args->ignoreUnrecognized)) {
3528       return JNI_EINVAL;
3529     }
3530   } else {
3531 #ifdef ASSERT
3532     // Parse default .hotspotrc settings file
3533     if (!process_settings_file(".hotspotrc", false,
3534                                cur_cmd_args->ignoreUnrecognized)) {
3535       return JNI_EINVAL;
3536     }
3537 #else
3538     struct stat buf;
3539     if (os::stat(hotspotrc, &buf) == 0) {
3540       needs_hotspotrc_warning = true;
3541     }
3542 #endif
3543   }
3544 
3545   if (PrintVMOptions) {
3546     print_options(cur_java_tool_options_args);
3547     print_options(cur_cmd_args);
3548     print_options(cur_java_options_args);
3549   }
3550 
3551   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3552   jint result = parse_vm_init_args(cur_vm_options_args,
3553                                    cur_java_tool_options_args,
3554                                    cur_java_options_args,
3555                                    cur_cmd_args);
3556 
3557   if (result != JNI_OK) {
3558     return result;
3559   }
3560 
3561   // Delay warning until here so that we've had a chance to process
3562   // the -XX:-PrintWarnings flag
3563   if (needs_hotspotrc_warning) {
3564     warning("%s file is present but has been ignored.  "
3565             "Run with -XX:Flags=%s to load the file.",
3566             hotspotrc, hotspotrc);
3567   }
3568 
3569   if (needs_module_property_warning) {
3570     warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3571             " names that are reserved for internal use.");
3572   }
3573 
3574 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
3575   UNSUPPORTED_OPTION(UseLargePages);
3576 #endif
3577 
3578 #if defined(AIX)
3579   UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3580 #endif
3581 
3582 #ifndef PRODUCT
3583   if (TraceBytecodesAt != 0) {
3584     TraceBytecodes = true;
3585   }
3586 #endif // PRODUCT
3587 
3588   if (ScavengeRootsInCode == 0) {
3589     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3590       warning("Forcing ScavengeRootsInCode non-zero");
3591     }
3592     ScavengeRootsInCode = 1;
3593   }
3594 
3595   if (!handle_deprecated_print_gc_flags()) {
3596     return JNI_EINVAL;
3597   }
3598 
3599   // Set object alignment values.
3600   set_object_alignment();
3601 
3602 #if !INCLUDE_CDS
3603   if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3604     jio_fprintf(defaultStream::error_stream(),
3605       "Shared spaces are not supported in this VM\n");
3606     return JNI_ERR;
3607   }
3608   if (DumpLoadedClassList != nullptr) {
3609     jio_fprintf(defaultStream::error_stream(),
3610       "DumpLoadedClassList is not supported in this VM\n");
3611     return JNI_ERR;
3612   }
3613   if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3614       log_is_enabled(Info, cds)) {
3615     warning("Shared spaces are not supported in this VM");
3616     UseSharedSpaces = false;
3617     LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3618   }
3619   no_shared_spaces("CDS Disabled");
3620 #endif // INCLUDE_CDS
3621 
3622   // Verify NMT arguments
3623   const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3624   if (lvl == NMT_unknown) {
3625     jio_fprintf(defaultStream::error_stream(),
3626                 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3627     return JNI_ERR;
3628   }
3629   if (PrintNMTStatistics && lvl == NMT_off) {
3630     warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3631     FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3632   }
3633 
3634   bool trace_dependencies = log_is_enabled(Debug, dependencies);
3635   if (trace_dependencies && VerifyDependencies) {
3636     warning("dependency logging results may be inflated by VerifyDependencies");
3637   }
3638 
3639   bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3640                               log_is_enabled(Info, class, load, cause);
3641   if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3642     warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3643   }
3644 
3645   apply_debugger_ergo();
3646 
3647   // The VMThread needs to stop now and then to execute these debug options.
3648   if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3649     FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3650   }
3651 
3652   if (log_is_enabled(Info, arguments)) {
3653     LogStream st(Log(arguments)::info());
3654     Arguments::print_on(&st);
3655   }
3656 
3657 #ifdef _LP64
3658   if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3659     warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3660     FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3661   }
3662   if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) {
3663     FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT);
3664   }
3665   if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3666     // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3667     if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3668       FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3669 
3670     // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3671     } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3672       FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3673     // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3674     } else {
3675       FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3676     }
3677   }
3678   if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3679     FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3680   }
3681   ObjLayout::initialize();
3682 #endif
3683 
3684   return JNI_OK;
3685 }
3686 
3687 jint Arguments::apply_ergo() {
3688   // Set flags based on ergonomics.
3689   jint result = set_ergonomics_flags();
3690   if (result != JNI_OK) return result;
3691 
3692   // Set heap size based on available physical memory
3693   set_heap_size();
3694 
3695   GCConfig::arguments()->initialize();
3696 
3697   if (UseCompressedClassPointers) {
3698     CompressedKlassPointers::pre_initialize();
3699   }
3700 
3701   CDSConfig::initialize();
3702 
3703   // Initialize Metaspace flags and alignments
3704   Metaspace::ergo_initialize();
3705 
3706   if (!StringDedup::ergo_initialize()) {
3707     return JNI_EINVAL;
3708   }
3709 
3710   // Set compiler flags after GC is selected and GC specific
3711   // flags (LoopStripMiningIter) are set.
3712   CompilerConfig::ergo_initialize();
3713 
3714   // Set bytecode rewriting flags
3715   set_bytecode_flags();
3716 
3717   // Set flags if aggressive optimization flags are enabled
3718   jint code = set_aggressive_opts_flags();
3719   if (code != JNI_OK) {
3720     return code;
3721   }
3722 
3723   if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3724     FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3725   } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3726     warning("UseSecondarySupersTable is not supported");
3727     FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3728   }

3729   if (!UseSecondarySupersTable) {
3730     FLAG_SET_DEFAULT(StressSecondarySupers, false);
3731     FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3732   }
3733 
3734 #ifdef ZERO
3735   // Clear flags not supported on zero.
3736   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3737 #endif // ZERO
3738 
3739   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3740     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3741     DebugNonSafepoints = true;
3742   }
3743 
3744   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3745     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3746   }
3747 
3748   // Treat the odd case where local verification is enabled but remote
3749   // verification is not as if both were enabled.
3750   if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3751     log_info(verification)("Turning on remote verification because local verification is on");
3752     FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3753   }
3754 
3755 #ifndef PRODUCT
3756   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3757     if (use_vm_log()) {
3758       LogVMOutput = true;
3759     }
3760   }
3761 #endif // PRODUCT
3762 
3763   if (PrintCommandLineFlags) {
3764     JVMFlag::printSetFlags(tty);
3765   }
3766 
3767 #if COMPILER2_OR_JVMCI
3768   if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3769     if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3770       warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3771     }
3772     FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3773 
3774     if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3775       if (!EnableVectorReboxing) {
3776         warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3777       } else {
3778         warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3779       }
3780     }
3781     FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3782 
3783     if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {
3784       warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");
3785     }
3786     FLAG_SET_DEFAULT(UseVectorStubs, false);
3787   }
3788 #endif // COMPILER2_OR_JVMCI
3789 
3790   if (log_is_enabled(Info, perf, class, link)) {
3791     if (!UsePerfData) {
3792       warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");





















3793       LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3794     }
3795   }





3796 
3797   if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3798     if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3799       LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3800     }
3801   }
3802   return JNI_OK;
3803 }
3804 
3805 jint Arguments::adjust_after_os() {
3806   if (UseNUMA) {
3807     if (UseParallelGC) {
3808       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3809          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3810       }
3811     }
3812   }
3813   return JNI_OK;
3814 }
3815 
3816 int Arguments::PropertyList_count(SystemProperty* pl) {
3817   int count = 0;
3818   while(pl != nullptr) {
3819     count++;
3820     pl = pl->next();
3821   }
3822   return count;
3823 }
3824 
3825 // Return the number of readable properties.
3826 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3827   int count = 0;
3828   while(pl != nullptr) {
3829     if (pl->readable()) {
3830       count++;
3831     }
3832     pl = pl->next();
3833   }
3834   return count;
3835 }
3836 
3837 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3838   assert(key != nullptr, "just checking");
3839   SystemProperty* prop;
3840   for (prop = pl; prop != nullptr; prop = prop->next()) {
3841     if (strcmp(key, prop->key()) == 0) return prop->value();
3842   }
3843   return nullptr;
3844 }
3845 
3846 // Return the value of the requested property provided that it is a readable property.
3847 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3848   assert(key != nullptr, "just checking");
3849   SystemProperty* prop;
3850   // Return the property value if the keys match and the property is not internal or
3851   // it's the special internal property "jdk.boot.class.path.append".
3852   for (prop = pl; prop != nullptr; prop = prop->next()) {
3853     if (strcmp(key, prop->key()) == 0) {
3854       if (!prop->internal()) {
3855         return prop->value();
3856       } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3857         return prop->value();
3858       } else {
3859         // Property is internal and not jdk.boot.class.path.append so return null.
3860         return nullptr;
3861       }
3862     }
3863   }
3864   return nullptr;
3865 }
3866 
3867 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3868   SystemProperty* p = *plist;
3869   if (p == nullptr) {
3870     *plist = new_p;
3871   } else {
3872     while (p->next() != nullptr) {
3873       p = p->next();
3874     }
3875     p->set_next(new_p);
3876   }
3877 }
3878 
3879 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3880                                  bool writeable, bool internal) {
3881   if (plist == nullptr)
3882     return;
3883 
3884   SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3885   PropertyList_add(plist, new_p);
3886 }
3887 
3888 void Arguments::PropertyList_add(SystemProperty *element) {
3889   PropertyList_add(&_system_properties, element);
3890 }
3891 
3892 // This add maintains unique property key in the list.
3893 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3894                                         PropertyAppendable append, PropertyWriteable writeable,
3895                                         PropertyInternal internal) {
3896   if (plist == nullptr)
3897     return;
3898 
3899   // If property key exists and is writeable, then update with new value.
3900   // Trying to update a non-writeable property is silently ignored.
3901   SystemProperty* prop;
3902   for (prop = *plist; prop != nullptr; prop = prop->next()) {
3903     if (strcmp(k, prop->key()) == 0) {
3904       if (append == AppendProperty) {
3905         prop->append_writeable_value(v);
3906       } else {
3907         prop->set_writeable_value(v);
3908       }
3909       return;
3910     }
3911   }
3912 
3913   PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3914 }
3915 
3916 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3917 // Returns true if all of the source pointed by src has been copied over to
3918 // the destination buffer pointed by buf. Otherwise, returns false.
3919 // Notes:
3920 // 1. If the length (buflen) of the destination buffer excluding the
3921 // null terminator character is not long enough for holding the expanded
3922 // pid characters, it also returns false instead of returning the partially
3923 // expanded one.
3924 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3925 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3926                                 char* buf, size_t buflen) {
3927   const char* p = src;
3928   char* b = buf;
3929   const char* src_end = &src[srclen];
3930   char* buf_end = &buf[buflen - 1];
3931 
3932   while (p < src_end && b < buf_end) {
3933     if (*p == '%') {
3934       switch (*(++p)) {
3935       case '%':         // "%%" ==> "%"
3936         *b++ = *p++;
3937         break;
3938       case 'p':  {       //  "%p" ==> current process id
3939         // buf_end points to the character before the last character so
3940         // that we could write '\0' to the end of the buffer.
3941         size_t buf_sz = buf_end - b + 1;
3942         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3943 
3944         // if jio_snprintf fails or the buffer is not long enough to hold
3945         // the expanded pid, returns false.
3946         if (ret < 0 || ret >= (int)buf_sz) {
3947           return false;
3948         } else {
3949           b += ret;
3950           assert(*b == '\0', "fail in copy_expand_pid");
3951           if (p == src_end && b == buf_end + 1) {
3952             // reach the end of the buffer.
3953             return true;
3954           }
3955         }
3956         p++;
3957         break;
3958       }
3959       default :
3960         *b++ = '%';
3961       }
3962     } else {
3963       *b++ = *p++;
3964     }
3965   }
3966   *b = '\0';
3967   return (p == src_end); // return false if not all of the source was copied
3968 }
--- EOF ---