1 /*
   2  * Copyright (c) 1997, 2025, 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 "cds/aotLogging.hpp"
  26 #include "cds/cds_globals.hpp"
  27 #include "cds/cdsConfig.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/javaAssertions.hpp"
  30 #include "classfile/moduleEntry.hpp"
  31 #include "classfile/stringTable.hpp"
  32 #include "classfile/symbolTable.hpp"
  33 #include "compiler/compilerDefinitions.hpp"
  34 #include "gc/shared/gcArguments.hpp"
  35 #include "gc/shared/gcConfig.hpp"
  36 #include "gc/shared/genArguments.hpp"
  37 #include "gc/shared/stringdedup/stringDedup.hpp"
  38 #include "gc/shared/tlab_globals.hpp"
  39 #include "jvm.h"
  40 #include "logging/log.hpp"
  41 #include "logging/logConfiguration.hpp"
  42 #include "logging/logStream.hpp"
  43 #include "logging/logTag.hpp"
  44 #include "memory/allocation.inline.hpp"
  45 #include "nmt/nmtCommon.hpp"
  46 #include "oops/compressedKlass.hpp"
  47 #include "oops/instanceKlass.hpp"
  48 #include "oops/objLayout.hpp"
  49 #include "oops/oop.inline.hpp"
  50 #include "prims/jvmtiAgentList.hpp"
  51 #include "prims/jvmtiExport.hpp"
  52 #include "runtime/arguments.hpp"
  53 #include "runtime/flags/jvmFlag.hpp"
  54 #include "runtime/flags/jvmFlagAccess.hpp"
  55 #include "runtime/flags/jvmFlagLimit.hpp"
  56 #include "runtime/globals_extension.hpp"
  57 #include "runtime/java.hpp"
  58 #include "runtime/os.hpp"
  59 #include "runtime/safepoint.hpp"
  60 #include "runtime/safepointMechanism.hpp"
  61 #include "runtime/synchronizer.hpp"
  62 #include "runtime/vm_version.hpp"
  63 #include "services/management.hpp"
  64 #include "utilities/align.hpp"
  65 #include "utilities/checkedCast.hpp"
  66 #include "utilities/debug.hpp"
  67 #include "utilities/defaultStream.hpp"
  68 #include "utilities/macros.hpp"
  69 #include "utilities/parseInteger.hpp"
  70 #include "utilities/powerOfTwo.hpp"
  71 #include "utilities/stringUtils.hpp"
  72 #include "utilities/systemMemoryBarrier.hpp"
  73 #if INCLUDE_JFR
  74 #include "jfr/jfr.hpp"
  75 #endif
  76 
  77 #include <limits>
  78 
  79 static const char _default_java_launcher[] = "generic";
  80 
  81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher
  82 
  83 char*  Arguments::_jvm_flags_file               = nullptr;
  84 char** Arguments::_jvm_flags_array              = nullptr;
  85 int    Arguments::_num_jvm_flags                = 0;
  86 char** Arguments::_jvm_args_array               = nullptr;
  87 int    Arguments::_num_jvm_args                 = 0;
  88 unsigned int Arguments::_addmods_count          = 0;
  89 #if INCLUDE_JVMCI
  90 bool   Arguments::_jvmci_module_added           = false;
  91 #endif
  92 char*  Arguments::_java_command                 = nullptr;
  93 SystemProperty* Arguments::_system_properties   = nullptr;
  94 size_t Arguments::_conservative_max_heap_alignment = 0;
  95 Arguments::Mode Arguments::_mode                = _mixed;
  96 const char*  Arguments::_java_vendor_url_bug    = nullptr;
  97 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  98 bool   Arguments::_executing_unit_tests         = false;
  99 
 100 // These parameters are reset in method parse_vm_init_args()
 101 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 102 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 103 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 104 bool   Arguments::_ClipInlining                 = ClipInlining;
 105 size_t Arguments::_default_SharedBaseAddress    = SharedBaseAddress;
 106 
 107 bool   Arguments::_enable_preview               = false;
 108 bool   Arguments::_has_jdwp_agent               = false;
 109 
 110 LegacyGCLogging Arguments::_legacyGCLogging     = { nullptr, 0 };
 111 
 112 // These are not set by the JDK's built-in launchers, but they can be set by
 113 // programs that embed the JVM using JNI_CreateJavaVM. See comments around
 114 // JavaVMOption in jni.h.
 115 abort_hook_t     Arguments::_abort_hook         = nullptr;
 116 exit_hook_t      Arguments::_exit_hook          = nullptr;
 117 vfprintf_hook_t  Arguments::_vfprintf_hook      = nullptr;
 118 
 119 
 120 SystemProperty *Arguments::_sun_boot_library_path = nullptr;
 121 SystemProperty *Arguments::_java_library_path = nullptr;
 122 SystemProperty *Arguments::_java_home = nullptr;
 123 SystemProperty *Arguments::_java_class_path = nullptr;
 124 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
 125 SystemProperty *Arguments::_vm_info = nullptr;
 126 
 127 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
 128 PathString *Arguments::_boot_class_path = nullptr;
 129 bool Arguments::_has_jimage = false;
 130 
 131 char* Arguments::_ext_dirs = nullptr;
 132 
 133 // True if -Xshare:auto option was specified.
 134 static bool xshare_auto_cmd_line = false;
 135 
 136 // True if -Xint/-Xmixed/-Xcomp were specified
 137 static bool mode_flag_cmd_line = false;
 138 
 139 struct VMInitArgsGroup {
 140   const JavaVMInitArgs* _args;
 141   JVMFlagOrigin _origin;
 142 };
 143 
 144 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
 145   char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
 146   if (new_value == nullptr) {
 147     assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
 148     return false;
 149   }
 150   if (_value != nullptr) {
 151     FreeHeap(_value);
 152   }
 153   _value = new_value;
 154   strcpy(_value, value);
 155   return true;
 156 }
 157 
 158 void PathString::append_value(const char *value) {
 159   char *sp;
 160   size_t len = 0;
 161   if (value != nullptr) {
 162     len = strlen(value);
 163     if (_value != nullptr) {
 164       len += strlen(_value);
 165     }
 166     sp = AllocateHeap(len+2, mtArguments);
 167     assert(sp != nullptr, "Unable to allocate space for new append path value");
 168     if (sp != nullptr) {
 169       if (_value != nullptr) {
 170         strcpy(sp, _value);
 171         strcat(sp, os::path_separator());
 172         strcat(sp, value);
 173         FreeHeap(_value);
 174       } else {
 175         strcpy(sp, value);
 176       }
 177       _value = sp;
 178     }
 179   }
 180 }
 181 
 182 PathString::PathString(const char* value) {
 183   if (value == nullptr) {
 184     _value = nullptr;
 185   } else {
 186     _value = AllocateHeap(strlen(value)+1, mtArguments);
 187     strcpy(_value, value);
 188   }
 189 }
 190 
 191 PathString::~PathString() {
 192   if (_value != nullptr) {
 193     FreeHeap(_value);
 194     _value = nullptr;
 195   }
 196 }
 197 
 198 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
 199   assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
 200   size_t len = strlen(module_name) + 1;
 201   _module_name = AllocateHeap(len, mtInternal);
 202   strncpy(_module_name, module_name, len); // copy the trailing null
 203   _path =  new PathString(path);
 204 }
 205 
 206 ModulePatchPath::~ModulePatchPath() {
 207   if (_module_name != nullptr) {
 208     FreeHeap(_module_name);
 209     _module_name = nullptr;
 210   }
 211   if (_path != nullptr) {
 212     delete _path;
 213     _path = nullptr;
 214   }
 215 }
 216 
 217 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
 218   if (key == nullptr) {
 219     _key = nullptr;
 220   } else {
 221     _key = AllocateHeap(strlen(key)+1, mtArguments);
 222     strcpy(_key, key);
 223   }
 224   _next = nullptr;
 225   _internal = internal;
 226   _writeable = writeable;
 227 }
 228 
 229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 230 // part of the option string.
 231 static bool match_option(const JavaVMOption *option, const char* name,
 232                          const char** tail) {
 233   size_t len = strlen(name);
 234   if (strncmp(option->optionString, name, len) == 0) {
 235     *tail = option->optionString + len;
 236     return true;
 237   } else {
 238     return false;
 239   }
 240 }
 241 
 242 // Check if 'option' matches 'name'. No "tail" is allowed.
 243 static bool match_option(const JavaVMOption *option, const char* name) {
 244   const char* tail = nullptr;
 245   bool result = match_option(option, name, &tail);
 246   if (tail != nullptr && *tail == '\0') {
 247     return result;
 248   } else {
 249     return false;
 250   }
 251 }
 252 
 253 // Return true if any of the strings in null-terminated array 'names' matches.
 254 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 255 // the option must match exactly.
 256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 257   bool tail_allowed) {
 258   for (/* empty */; *names != nullptr; ++names) {
 259   if (match_option(option, *names, tail)) {
 260       if (**tail == '\0' || (tail_allowed && **tail == ':')) {
 261         return true;
 262       }
 263     }
 264   }
 265   return false;
 266 }
 267 
 268 #if INCLUDE_JFR
 269 static bool _has_jfr_option = false;  // is using JFR
 270 
 271 // return true on failure
 272 static bool match_jfr_option(const JavaVMOption** option) {
 273   assert((*option)->optionString != nullptr, "invariant");
 274   char* tail = nullptr;
 275   if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
 276     _has_jfr_option = true;
 277     return Jfr::on_start_flight_recording_option(option, tail);
 278   } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
 279     _has_jfr_option = true;
 280     return Jfr::on_flight_recorder_option(option, tail);
 281   }
 282   return false;
 283 }
 284 
 285 bool Arguments::has_jfr_option() {
 286   return _has_jfr_option;
 287 }
 288 #endif
 289 
 290 static void logOption(const char* opt) {
 291   if (PrintVMOptions) {
 292     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 293   }
 294 }
 295 
 296 bool needs_module_property_warning = false;
 297 
 298 #define MODULE_PROPERTY_PREFIX "jdk.module."
 299 #define MODULE_PROPERTY_PREFIX_LEN 11
 300 #define ADDEXPORTS "addexports"
 301 #define ADDEXPORTS_LEN 10
 302 #define ADDREADS "addreads"
 303 #define ADDREADS_LEN 8
 304 #define ADDOPENS "addopens"
 305 #define ADDOPENS_LEN 8
 306 #define PATCH "patch"
 307 #define PATCH_LEN 5
 308 #define ADDMODS "addmods"
 309 #define ADDMODS_LEN 7
 310 #define LIMITMODS "limitmods"
 311 #define LIMITMODS_LEN 9
 312 #define PATH "path"
 313 #define PATH_LEN 4
 314 #define UPGRADE_PATH "upgrade.path"
 315 #define UPGRADE_PATH_LEN 12
 316 #define ENABLE_NATIVE_ACCESS "enable.native.access"
 317 #define ENABLE_NATIVE_ACCESS_LEN 20
 318 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access"
 319 #define ILLEGAL_NATIVE_ACCESS_LEN 21
 320 
 321 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
 322 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
 323   return ((strncmp(option, property, len) == 0) &&
 324           (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
 325 }
 326 
 327 // Return true if property starts with "jdk.module." and its ensuing chars match
 328 // any of the reserved module properties.
 329 // property should be passed without the leading "-D".
 330 bool Arguments::is_internal_module_property(const char* property) {
 331   return internal_module_property_helper(property, false);
 332 }
 333 
 334 // Returns true if property is one of those recognized by is_internal_module_property() but
 335 // is not supported by CDS archived full module graph.
 336 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) {
 337   return internal_module_property_helper(property, true);
 338 }
 339 
 340 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) {
 341   if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
 342     const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
 343     if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
 344         matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
 345         matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
 346         matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) {
 347       return true;
 348     }
 349 
 350     if (!check_for_cds) {
 351       // CDS notes: these properties are supported by CDS archived full module graph.
 352       if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
 353           matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
 354           matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
 355           matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
 356           matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
 357           matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
 358         return true;
 359       }
 360     }
 361   }
 362   return false;
 363 }
 364 
 365 // Process java launcher properties.
 366 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 367   // See if sun.java.launcher is defined.
 368   // Must do this before setting up other system properties,
 369   // as some of them may depend on launcher type.
 370   for (int index = 0; index < args->nOptions; index++) {
 371     const JavaVMOption* option = args->options + index;
 372     const char* tail;
 373 
 374     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 375       process_java_launcher_argument(tail, option->extraInfo);
 376       continue;
 377     }
 378     if (match_option(option, "-XX:+ExecutingUnitTests")) {
 379       _executing_unit_tests = true;
 380       continue;
 381     }
 382   }
 383 }
 384 
 385 // Initialize system properties key and value.
 386 void Arguments::init_system_properties() {
 387 
 388   // Set up _boot_class_path which is not a property but
 389   // relies heavily on argument processing and the jdk.boot.class.path.append
 390   // property. It is used to store the underlying boot class path.
 391   _boot_class_path = new PathString(nullptr);
 392 
 393   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 394                                                            "Java Virtual Machine Specification",  false));
 395   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 396   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 397   PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(),  false));
 398 
 399   // Initialize the vm.info now, but it will need updating after argument parsing.
 400   _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
 401 
 402   // Following are JVMTI agent writable properties.
 403   // Properties values are set to nullptr and they are
 404   // os specific they are initialized in os::init_system_properties_values().
 405   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr,  true);
 406   _java_library_path = new SystemProperty("java.library.path", nullptr,  true);
 407   _java_home =  new SystemProperty("java.home", nullptr,  true);
 408   _java_class_path = new SystemProperty("java.class.path", "",  true);
 409   // jdk.boot.class.path.append is a non-writeable, internal property.
 410   // It can only be set by either:
 411   //    - -Xbootclasspath/a:
 412   //    - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
 413   _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);
 414 
 415   // Add to System Property list.
 416   PropertyList_add(&_system_properties, _sun_boot_library_path);
 417   PropertyList_add(&_system_properties, _java_library_path);
 418   PropertyList_add(&_system_properties, _java_home);
 419   PropertyList_add(&_system_properties, _java_class_path);
 420   PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
 421   PropertyList_add(&_system_properties, _vm_info);
 422 
 423   // Set OS specific system properties values
 424   os::init_system_properties_values();
 425 }
 426 
 427 // Update/Initialize System properties after JDK version number is known
 428 void Arguments::init_version_specific_system_properties() {
 429   enum { bufsz = 16 };
 430   char buffer[bufsz];
 431   const char* spec_vendor = "Oracle Corporation";
 432   uint32_t spec_version = JDK_Version::current().major_version();
 433 
 434   jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
 435 
 436   PropertyList_add(&_system_properties,
 437       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 438   PropertyList_add(&_system_properties,
 439       new SystemProperty("java.vm.specification.version", buffer, false));
 440   PropertyList_add(&_system_properties,
 441       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 442 }
 443 
 444 /*
 445  *  -XX argument processing:
 446  *
 447  *  -XX arguments are defined in several places, such as:
 448  *      globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
 449  *  -XX arguments are parsed in parse_argument().
 450  *  -XX argument bounds checking is done in check_vm_args_consistency().
 451  *
 452  * Over time -XX arguments may change. There are mechanisms to handle common cases:
 453  *
 454  *      ALIASED: An option that is simply another name for another option. This is often
 455  *               part of the process of deprecating a flag, but not all aliases need
 456  *               to be deprecated.
 457  *
 458  *               Create an alias for an option by adding the old and new option names to the
 459  *               "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
 460  *
 461  *   DEPRECATED: An option that is supported, but a warning is printed to let the user know that
 462  *               support may be removed in the future. Both regular and aliased options may be
 463  *               deprecated.
 464  *
 465  *               Add a deprecation warning for an option (or alias) by adding an entry in the
 466  *               "special_jvm_flags" table and setting the "deprecated_in" field.
 467  *               Often an option "deprecated" in one major release will
 468  *               be made "obsolete" in the next. In this case the entry should also have its
 469  *               "obsolete_in" field set.
 470  *
 471  *     OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
 472  *               on the command line. A warning is printed to let the user know that option might not
 473  *               be accepted in the future.
 474  *
 475  *               Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
 476  *               table and setting the "obsolete_in" field.
 477  *
 478  *      EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
 479  *               to the current JDK version. The system will flatly refuse to admit the existence of
 480  *               the flag. This allows a flag to die automatically over JDK releases.
 481  *
 482  *               Note that manual cleanup of expired options should be done at major JDK version upgrades:
 483  *                  - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
 484  *                  - Newly obsolete or expired deprecated options should have their global variable
 485  *                    definitions removed (from globals.hpp, etc) and related implementations removed.
 486  *
 487  * Recommended approach for removing options:
 488  *
 489  * To remove options commonly used by customers (e.g. product -XX options), use
 490  * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
 491  *
 492  * To remove internal options (e.g. diagnostic, experimental, develop options), use
 493  * a 2-step model adding major release numbers to the obsolete and expire columns.
 494  *
 495  * To change the name of an option, use the alias table as well as a 2-step
 496  * model adding major release numbers to the deprecate and expire columns.
 497  * Think twice about aliasing commonly used customer options.
 498  *
 499  * There are times when it is appropriate to leave a future release number as undefined.
 500  *
 501  * Tests:  Aliases should be tested in VMAliasOptions.java.
 502  *         Deprecated options should be tested in VMDeprecatedOptions.java.
 503  */
 504 
 505 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
 506 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
 507 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
 508 // the command-line as usual, but will issue a warning.
 509 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
 510 // the command-line, while issuing a warning and ignoring the flag value.
 511 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
 512 // existence of the flag.
 513 //
 514 // MANUAL CLEANUP ON JDK VERSION UPDATES:
 515 // This table ensures that the handling of options will update automatically when the JDK
 516 // version is incremented, but the source code needs to be cleanup up manually:
 517 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
 518 //   variable should be removed, as well as users of the variable.
 519 // - As "deprecated" options age into "obsolete" options, move the entry into the
 520 //   "Obsolete Flags" section of the table.
 521 // - All expired options should be removed from the table.
 522 static SpecialFlag const special_jvm_flags[] = {
 523   // -------------- Deprecated Flags --------------
 524   // --- Non-alias flags - sorted by obsolete_in then expired_in:
 525   { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
 526   { "FlightRecorder",               JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
 527   { "DumpSharedSpaces",             JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
 528   { "DynamicDumpSharedSpaces",      JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
 529   { "RequireSharedSpaces",          JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
 530   { "UseSharedSpaces",              JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
 531   { "LockingMode",                  JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },
 532 #ifdef _LP64
 533   { "UseCompressedClassPointers",   JDK_Version::jdk(25),  JDK_Version::jdk(26), JDK_Version::undefined() },
 534 #endif
 535   { "ParallelRefProcEnabled",       JDK_Version::jdk(26),  JDK_Version::jdk(27), JDK_Version::jdk(28) },
 536   { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26),  JDK_Version::jdk(27), JDK_Version::jdk(28) },
 537   { "PSChunkLargeArrays",           JDK_Version::jdk(26),  JDK_Version::jdk(27), JDK_Version::jdk(28) },
 538   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
 539   { "CreateMinidumpOnCrash",        JDK_Version::jdk(9),  JDK_Version::undefined(), JDK_Version::undefined() },
 540 
 541   // -------------- Obsolete Flags - sorted by expired_in --------------
 542 
 543 #ifdef LINUX
 544   { "UseOprofile",                  JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) },
 545 #endif
 546   { "MetaspaceReclaimPolicy",       JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },
 547   { "ZGenerational",                JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() },
 548   { "ZMarkStackSpaceLimit",         JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
 549 #if defined(AARCH64)
 550   { "NearCpool",                    JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() },
 551 #endif
 552 
 553 #ifdef ASSERT
 554   { "DummyObsoleteTestFlag",        JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
 555 #endif
 556 
 557 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
 558   // These entries will generate build errors.  Their purpose is to test the macros.
 559   { "dep > obs",                    JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
 560   { "dep > exp ",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
 561   { "obs > exp ",                   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
 562   { "obs > exp",                    JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
 563   { "not deprecated or obsolete",   JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
 564   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 565   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 566 #endif
 567 
 568   { nullptr, JDK_Version(0), JDK_Version(0) }
 569 };
 570 
 571 // Flags that are aliases for other flags.
 572 typedef struct {
 573   const char* alias_name;
 574   const char* real_name;
 575 } AliasedFlag;
 576 
 577 static AliasedFlag const aliased_jvm_flags[] = {
 578   { "CreateMinidumpOnCrash",    "CreateCoredumpOnCrash" },
 579   { nullptr, nullptr}
 580 };
 581 
 582 // Return true if "v" is less than "other", where "other" may be "undefined".
 583 static bool version_less_than(JDK_Version v, JDK_Version other) {
 584   assert(!v.is_undefined(), "must be defined");
 585   if (!other.is_undefined() && v.compare(other) >= 0) {
 586     return false;
 587   } else {
 588     return true;
 589   }
 590 }
 591 
 592 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
 593   for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
 594     if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 595       flag = special_jvm_flags[i];
 596       return true;
 597     }
 598   }
 599   return false;
 600 }
 601 
 602 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
 603   assert(version != nullptr, "Must provide a version buffer");
 604   SpecialFlag flag;
 605   if (lookup_special_flag(flag_name, flag)) {
 606     if (!flag.obsolete_in.is_undefined()) {
 607       if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 608         *version = flag.obsolete_in;
 609         // This flag may have been marked for obsoletion in this version, but we may not
 610         // have actually removed it yet. Rather than ignoring it as soon as we reach
 611         // this version we allow some time for the removal to happen. So if the flag
 612         // still actually exists we process it as normal, but issue an adjusted warning.
 613         const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
 614         if (real_flag != nullptr) {
 615           char version_str[256];
 616           version->to_string(version_str, sizeof(version_str));
 617           warning("Temporarily processing option %s; support is scheduled for removal in %s",
 618                   flag_name, version_str);
 619           return false;
 620         }
 621         return true;
 622       }
 623     }
 624   }
 625   return false;
 626 }
 627 
 628 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
 629   assert(version != nullptr, "Must provide a version buffer");
 630   SpecialFlag flag;
 631   if (lookup_special_flag(flag_name, flag)) {
 632     if (!flag.deprecated_in.is_undefined()) {
 633       if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
 634           version_less_than(JDK_Version::current(), flag.expired_in)) {
 635         *version = flag.deprecated_in;
 636         return 1;
 637       } else {
 638         return -1;
 639       }
 640     }
 641   }
 642   return 0;
 643 }
 644 
 645 const char* Arguments::real_flag_name(const char *flag_name) {
 646   for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {
 647     const AliasedFlag& flag_status = aliased_jvm_flags[i];
 648     if (strcmp(flag_status.alias_name, flag_name) == 0) {
 649         return flag_status.real_name;
 650     }
 651   }
 652   return flag_name;
 653 }
 654 
 655 #ifdef ASSERT
 656 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
 657   for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
 658     if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 659       return true;
 660     }
 661   }
 662   return false;
 663 }
 664 
 665 // Verifies the correctness of the entries in the special_jvm_flags table.
 666 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
 667 // version being earlier than the deprecation version, then a warning is issued
 668 // and verification fails - by returning false. If it is detected that the table
 669 // is out of date, with respect to the current version, then ideally a warning is
 670 // issued but verification does not fail. This allows the VM to operate when the
 671 // version is first updated, without needing to update all the impacted flags at
 672 // the same time. In practice we can't issue the warning immediately when the version
 673 // is updated as it occurs for every test and some tests are not prepared to handle
 674 // unexpected output - see 8196739. Instead we only check if the table is up-to-date
 675 // if the check_globals flag is true, and in addition allow a grace period and only
 676 // check for stale flags when we hit build 25 (which is far enough into the 6 month
 677 // release cycle that all flag updates should have been processed, whilst still
 678 // leaving time to make the change before RDP2).
 679 // We use a gtest to call this, passing true, so that we can detect stale flags before
 680 // the end of the release cycle.
 681 
 682 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
 683 
 684 bool Arguments::verify_special_jvm_flags(bool check_globals) {
 685   bool success = true;
 686   for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {
 687     const SpecialFlag& flag = special_jvm_flags[i];
 688     if (lookup_special_flag(flag.name, i)) {
 689       warning("Duplicate special flag declaration \"%s\"", flag.name);
 690       success = false;
 691     }
 692     if (flag.deprecated_in.is_undefined() &&
 693         flag.obsolete_in.is_undefined()) {
 694       warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
 695       success = false;
 696     }
 697 
 698     if (!flag.deprecated_in.is_undefined()) {
 699       if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
 700         warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
 701         success = false;
 702       }
 703 
 704       if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
 705         warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
 706         success = false;
 707       }
 708     }
 709 
 710     if (!flag.obsolete_in.is_undefined()) {
 711       if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
 712         warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
 713         success = false;
 714       }
 715 
 716       // if flag has become obsolete it should not have a "globals" flag defined anymore.
 717       if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
 718           !version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 719         if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
 720           warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
 721           success = false;
 722         }
 723       }
 724 
 725     } else if (!flag.expired_in.is_undefined()) {
 726       warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
 727       success = false;
 728     }
 729 
 730     if (!flag.expired_in.is_undefined()) {
 731       // if flag has become expired it should not have a "globals" flag defined anymore.
 732       if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
 733           !version_less_than(JDK_Version::current(), flag.expired_in)) {
 734         if (JVMFlag::find_declared_flag(flag.name) != nullptr) {
 735           warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
 736           success = false;
 737         }
 738       }
 739     }
 740   }
 741   return success;
 742 }
 743 #endif
 744 
 745 bool Arguments::atojulong(const char *s, julong* result) {
 746   return parse_integer(s, result);
 747 }
 748 
 749 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
 750   if (size < min_size) return arg_too_small;
 751   if (size > max_size) return arg_too_big;
 752   return arg_in_range;
 753 }
 754 
 755 // Describe an argument out of range error
 756 void Arguments::describe_range_error(ArgsRange errcode) {
 757   switch(errcode) {
 758   case arg_too_big:
 759     jio_fprintf(defaultStream::error_stream(),
 760                 "The specified size exceeds the maximum "
 761                 "representable size.\n");
 762     break;
 763   case arg_too_small:
 764   case arg_unreadable:
 765   case arg_in_range:
 766     // do nothing for now
 767     break;
 768   default:
 769     ShouldNotReachHere();
 770   }
 771 }
 772 
 773 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
 774   if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
 775     return true;
 776   } else {
 777     return false;
 778   }
 779 }
 780 
 781 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
 782   // strtod allows leading whitespace, but our flag format does not.
 783   if (*value == '\0' || isspace((unsigned char) *value)) {
 784     return false;
 785   }
 786   char* end;
 787   errno = 0;
 788   double v = strtod(value, &end);
 789   if ((errno != 0) || (*end != 0)) {
 790     return false;
 791   }
 792   if (g_isnan(v) || !g_isfinite(v)) {
 793     // Currently we cannot handle these special values.
 794     return false;
 795   }
 796 
 797   if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
 798     return true;
 799   }
 800   return false;
 801 }
 802 
 803 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
 804   JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
 805 
 806   if (flag->is_int()) {
 807     int v;
 808     if (parse_integer(value, &v)) {
 809       result = JVMFlagAccess::set_int(flag, &v, origin);
 810     }
 811   } else if (flag->is_uint()) {
 812     uint v;
 813     if (parse_integer(value, &v)) {
 814       result = JVMFlagAccess::set_uint(flag, &v, origin);
 815     }
 816   } else if (flag->is_intx()) {
 817     intx v;
 818     if (parse_integer(value, &v)) {
 819       result = JVMFlagAccess::set_intx(flag, &v, origin);
 820     }
 821   } else if (flag->is_uintx()) {
 822     uintx v;
 823     if (parse_integer(value, &v)) {
 824       result = JVMFlagAccess::set_uintx(flag, &v, origin);
 825     }
 826   } else if (flag->is_uint64_t()) {
 827     uint64_t v;
 828     if (parse_integer(value, &v)) {
 829       result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
 830     }
 831   } else if (flag->is_size_t()) {
 832     size_t v;
 833     if (parse_integer(value, &v)) {
 834       result = JVMFlagAccess::set_size_t(flag, &v, origin);
 835     }
 836   }
 837 
 838   return result == JVMFlag::SUCCESS;
 839 }
 840 
 841 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
 842   if (value[0] == '\0') {
 843     value = nullptr;
 844   }
 845   if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
 846   // Contract:  JVMFlag always returns a pointer that needs freeing.
 847   FREE_C_HEAP_ARRAY(char, value);
 848   return true;
 849 }
 850 
 851 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
 852   const char* old_value = "";
 853   if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
 854   size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
 855   size_t new_len = strlen(new_value);
 856   const char* value;
 857   char* free_this_too = nullptr;
 858   if (old_len == 0) {
 859     value = new_value;
 860   } else if (new_len == 0) {
 861     value = old_value;
 862   } else {
 863      size_t length = old_len + 1 + new_len + 1;
 864      char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
 865     // each new setting adds another LINE to the switch:
 866     jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
 867     value = buf;
 868     free_this_too = buf;
 869   }
 870   (void) JVMFlagAccess::set_ccstr(flag, &value, origin);
 871   // JVMFlag always returns a pointer that needs freeing.
 872   FREE_C_HEAP_ARRAY(char, value);
 873   // JVMFlag made its own copy, so I must delete my own temp. buffer.
 874   FREE_C_HEAP_ARRAY(char, free_this_too);
 875   return true;
 876 }
 877 
 878 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
 879   const char* real_name = real_flag_name(arg);
 880   JDK_Version since = JDK_Version();
 881   switch (is_deprecated_flag(arg, &since)) {
 882   case -1: {
 883       // Obsolete or expired, so don't process normally,
 884       // but allow for an obsolete flag we're still
 885       // temporarily allowing.
 886       if (!is_obsolete_flag(arg, &since)) {
 887         return real_name;
 888       }
 889       // Note if we're not considered obsolete then we can't be expired either
 890       // as obsoletion must come first.
 891       return nullptr;
 892     }
 893     case 0:
 894       return real_name;
 895     case 1: {
 896       char version[256];
 897       since.to_string(version, sizeof(version));
 898       if (real_name != arg) {
 899         warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
 900                 arg, version, real_name);
 901       } else {
 902         warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
 903                 arg, version);
 904       }
 905       return real_name;
 906     }
 907   }
 908   ShouldNotReachHere();
 909   return nullptr;
 910 }
 911 
 912 #define BUFLEN 255
 913 
 914 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
 915   char name_copied[BUFLEN+1];
 916   if (name[name_length] != 0) {
 917     if (name_length > BUFLEN) {
 918       return nullptr;
 919     } else {
 920       strncpy(name_copied, name, name_length);
 921       name_copied[name_length] = '\0';
 922       name = name_copied;
 923     }
 924   }
 925 
 926   const char* real_name = Arguments::handle_aliases_and_deprecation(name);
 927   if (real_name == nullptr) {
 928     return nullptr;
 929   }
 930   JVMFlag* flag = JVMFlag::find_flag(real_name);
 931   return flag;
 932 }
 933 
 934 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
 935   bool is_bool = false;
 936   bool bool_val = false;
 937   char c = *arg;
 938   if (c == '+' || c == '-') {
 939     is_bool = true;
 940     bool_val = (c == '+');
 941     arg++;
 942   }
 943 
 944   const char* name = arg;
 945   while (true) {
 946     c = *arg;
 947     if (isalnum(c) || (c == '_')) {
 948       ++arg;
 949     } else {
 950       break;
 951     }
 952   }
 953 
 954   size_t name_len = size_t(arg - name);
 955   if (name_len == 0) {
 956     return false;
 957   }
 958 
 959   JVMFlag* flag = find_jvm_flag(name, name_len);
 960   if (flag == nullptr) {
 961     return false;
 962   }
 963 
 964   if (is_bool) {
 965     if (*arg != 0) {
 966       // Error -- extra characters such as -XX:+BoolFlag=123
 967       return false;
 968     }
 969     return set_bool_flag(flag, bool_val, origin);
 970   }
 971 
 972   if (arg[0] == '=') {
 973     const char* value = arg + 1;
 974     if (flag->is_ccstr()) {
 975       if (flag->ccstr_accumulates()) {
 976         return append_to_string_flag(flag, value, origin);
 977       } else {
 978         return set_string_flag(flag, value, origin);
 979       }
 980     } else if (flag->is_double()) {
 981       return set_fp_numeric_flag(flag, value, origin);
 982     } else {
 983       return set_numeric_flag(flag, value, origin);
 984     }
 985   }
 986 
 987   if (arg[0] == ':' && arg[1] == '=') {
 988     // -XX:Foo:=xxx will reset the string flag to the given value.
 989     const char* value = arg + 2;
 990     return set_string_flag(flag, value, origin);
 991   }
 992 
 993   return false;
 994 }
 995 
 996 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 997   assert(bldarray != nullptr, "illegal argument");
 998 
 999   if (arg == nullptr) {
1000     return;
1001   }
1002 
1003   int new_count = *count + 1;
1004 
1005   // expand the array and add arg to the last element
1006   if (*bldarray == nullptr) {
1007     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1008   } else {
1009     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1010   }
1011   (*bldarray)[*count] = os::strdup_check_oom(arg);
1012   *count = new_count;
1013 }
1014 
1015 void Arguments::build_jvm_args(const char* arg) {
1016   add_string(&_jvm_args_array, &_num_jvm_args, arg);
1017 }
1018 
1019 void Arguments::build_jvm_flags(const char* arg) {
1020   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1021 }
1022 
1023 // utility function to return a string that concatenates all
1024 // strings in a given char** array
1025 const char* Arguments::build_resource_string(char** args, int count) {
1026   if (args == nullptr || count == 0) {
1027     return nullptr;
1028   }
1029   size_t length = 0;
1030   for (int i = 0; i < count; i++) {
1031     length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1032   }
1033   char* s = NEW_RESOURCE_ARRAY(char, length);
1034   char* dst = s;
1035   for (int j = 0; j < count; j++) {
1036     size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1037     jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1038     dst += offset;
1039     length -= offset;
1040   }
1041   return (const char*) s;
1042 }
1043 
1044 void Arguments::print_on(outputStream* st) {
1045   st->print_cr("VM Arguments:");
1046   if (num_jvm_flags() > 0) {
1047     st->print("jvm_flags: "); print_jvm_flags_on(st);
1048     st->cr();
1049   }
1050   if (num_jvm_args() > 0) {
1051     st->print("jvm_args: "); print_jvm_args_on(st);
1052     st->cr();
1053   }
1054   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1055   if (_java_class_path != nullptr) {
1056     char* path = _java_class_path->value();
1057     size_t len = strlen(path);
1058     st->print("java_class_path (initial): ");
1059     // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1060     if (len == 0) {
1061       st->print_raw_cr("<not set>");
1062     } else {
1063       st->print_raw_cr(path, len);
1064     }
1065   }
1066   st->print_cr("Launcher Type: %s", _sun_java_launcher);
1067 }
1068 
1069 void Arguments::print_summary_on(outputStream* st) {
1070   // Print the command line.  Environment variables that are helpful for
1071   // reproducing the problem are written later in the hs_err file.
1072   // flags are from setting file
1073   if (num_jvm_flags() > 0) {
1074     st->print_raw("Settings File: ");
1075     print_jvm_flags_on(st);
1076     st->cr();
1077   }
1078   // args are the command line and environment variable arguments.
1079   st->print_raw("Command Line: ");
1080   if (num_jvm_args() > 0) {
1081     print_jvm_args_on(st);
1082   }
1083   // this is the classfile and any arguments to the java program
1084   if (java_command() != nullptr) {
1085     st->print("%s", java_command());
1086   }
1087   st->cr();
1088 }
1089 
1090 void Arguments::print_jvm_flags_on(outputStream* st) {
1091   if (_num_jvm_flags > 0) {
1092     for (int i=0; i < _num_jvm_flags; i++) {
1093       st->print("%s ", _jvm_flags_array[i]);
1094     }
1095   }
1096 }
1097 
1098 void Arguments::print_jvm_args_on(outputStream* st) {
1099   if (_num_jvm_args > 0) {
1100     for (int i=0; i < _num_jvm_args; i++) {
1101       st->print("%s ", _jvm_args_array[i]);
1102     }
1103   }
1104 }
1105 
1106 bool Arguments::process_argument(const char* arg,
1107                                  jboolean ignore_unrecognized,
1108                                  JVMFlagOrigin origin) {
1109   JDK_Version since = JDK_Version();
1110 
1111   if (parse_argument(arg, origin)) {
1112     return true;
1113   }
1114 
1115   // Determine if the flag has '+', '-', or '=' characters.
1116   bool has_plus_minus = (*arg == '+' || *arg == '-');
1117   const char* const argname = has_plus_minus ? arg + 1 : arg;
1118 
1119   size_t arg_len;
1120   const char* equal_sign = strchr(argname, '=');
1121   if (equal_sign == nullptr) {
1122     arg_len = strlen(argname);
1123   } else {
1124     arg_len = equal_sign - argname;
1125   }
1126 
1127   // Only make the obsolete check for valid arguments.
1128   if (arg_len <= BUFLEN) {
1129     // Construct a string which consists only of the argument name without '+', '-', or '='.
1130     char stripped_argname[BUFLEN+1]; // +1 for '\0'
1131     jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1132     if (is_obsolete_flag(stripped_argname, &since)) {
1133       char version[256];
1134       since.to_string(version, sizeof(version));
1135       warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1136       return true;
1137     }
1138   }
1139 
1140   // For locked flags, report a custom error message if available.
1141   // Otherwise, report the standard unrecognized VM option.
1142   const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1143   if (found_flag != nullptr) {
1144     char locked_message_buf[BUFLEN];
1145     JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1146     if (strlen(locked_message_buf) != 0) {
1147 #ifdef PRODUCT
1148       bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1149       if (ignore_unrecognized && mismatched) {
1150         return true;
1151       }
1152 #endif
1153       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1154     }
1155     if (found_flag->is_bool() && !has_plus_minus) {
1156       jio_fprintf(defaultStream::error_stream(),
1157         "Missing +/- setting for VM option '%s'\n", argname);
1158     } else if (!found_flag->is_bool() && has_plus_minus) {
1159       jio_fprintf(defaultStream::error_stream(),
1160         "Unexpected +/- setting in VM option '%s'\n", argname);
1161     } else {
1162       jio_fprintf(defaultStream::error_stream(),
1163         "Improperly specified VM option '%s'\n", argname);
1164     }
1165   } else {
1166     if (ignore_unrecognized) {
1167       return true;
1168     }
1169     jio_fprintf(defaultStream::error_stream(),
1170                 "Unrecognized VM option '%s'\n", argname);
1171     JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1172     if (fuzzy_matched != nullptr) {
1173       jio_fprintf(defaultStream::error_stream(),
1174                   "Did you mean '%s%s%s'?\n",
1175                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1176                   fuzzy_matched->name(),
1177                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
1178     }
1179   }
1180 
1181   // allow for commandline "commenting out" options like -XX:#+Verbose
1182   return arg[0] == '#';
1183 }
1184 
1185 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1186   FILE* stream = os::fopen(file_name, "rb");
1187   if (stream == nullptr) {
1188     if (should_exist) {
1189       jio_fprintf(defaultStream::error_stream(),
1190                   "Could not open settings file %s\n", file_name);
1191       return false;
1192     } else {
1193       return true;
1194     }
1195   }
1196 
1197   char token[1024];
1198   int  pos = 0;
1199 
1200   bool in_white_space = true;
1201   bool in_comment     = false;
1202   bool in_quote       = false;
1203   int  quote_c        = 0;
1204   bool result         = true;
1205 
1206   int c = getc(stream);
1207   while(c != EOF && pos < (int)(sizeof(token)-1)) {
1208     if (in_white_space) {
1209       if (in_comment) {
1210         if (c == '\n') in_comment = false;
1211       } else {
1212         if (c == '#') in_comment = true;
1213         else if (!isspace((unsigned char) c)) {
1214           in_white_space = false;
1215           token[pos++] = checked_cast<char>(c);
1216         }
1217       }
1218     } else {
1219       if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {
1220         // token ends at newline, or at unquoted whitespace
1221         // this allows a way to include spaces in string-valued options
1222         token[pos] = '\0';
1223         logOption(token);
1224         result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1225         build_jvm_flags(token);
1226         pos = 0;
1227         in_white_space = true;
1228         in_quote = false;
1229       } else if (!in_quote && (c == '\'' || c == '"')) {
1230         in_quote = true;
1231         quote_c = c;
1232       } else if (in_quote && (c == quote_c)) {
1233         in_quote = false;
1234       } else {
1235         token[pos++] = checked_cast<char>(c);
1236       }
1237     }
1238     c = getc(stream);
1239   }
1240   if (pos > 0) {
1241     token[pos] = '\0';
1242     result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1243     build_jvm_flags(token);
1244   }
1245   fclose(stream);
1246   return result;
1247 }
1248 
1249 //=============================================================================================================
1250 // Parsing of properties (-D)
1251 
1252 const char* Arguments::get_property(const char* key) {
1253   return PropertyList_get_value(system_properties(), key);
1254 }
1255 
1256 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1257   const char* eq = strchr(prop, '=');
1258   const char* key;
1259   const char* value = "";
1260 
1261   if (eq == nullptr) {
1262     // property doesn't have a value, thus use passed string
1263     key = prop;
1264   } else {
1265     // property have a value, thus extract it and save to the
1266     // allocated string
1267     size_t key_len = eq - prop;
1268     char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1269 
1270     jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1271     key = tmp_key;
1272 
1273     value = &prop[key_len + 1];
1274   }
1275 
1276   if (internal == ExternalProperty) {
1277     CDSConfig::check_incompatible_property(key, value);
1278   }
1279 
1280   if (strcmp(key, "java.compiler") == 0) {
1281     // we no longer support java.compiler system property, log a warning and let it get
1282     // passed to Java, like any other system property
1283     if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {
1284         // for applications using NONE or empty value, log a more informative message
1285         warning("The java.compiler system property is obsolete and no longer supported, use -Xint");
1286     } else {
1287         warning("The java.compiler system property is obsolete and no longer supported.");
1288     }
1289   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1290     // append is true, writable is true, internal is false
1291     PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1292                             WriteableProperty, ExternalProperty);
1293   } else {
1294     if (strcmp(key, "sun.java.command") == 0) {
1295       char *old_java_command = _java_command;
1296       _java_command = os::strdup_check_oom(value, mtArguments);
1297       if (old_java_command != nullptr) {
1298         os::free(old_java_command);
1299       }
1300     } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1301       // If this property is set on the command line then its value will be
1302       // displayed in VM error logs as the URL at which to submit such logs.
1303       // Normally the URL displayed in error logs is different from the value
1304       // of this system property, so a different property should have been
1305       // used here, but we leave this as-is in case someone depends upon it.
1306       const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1307       // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1308       // its value without going through the property list or making a Java call.
1309       _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1310       if (old_java_vendor_url_bug != nullptr) {
1311         os::free((void *)old_java_vendor_url_bug);
1312       }
1313     }
1314 
1315     // Create new property and add at the end of the list
1316     PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1317   }
1318 
1319   if (key != prop) {
1320     // SystemProperty copy passed value, thus free previously allocated
1321     // memory
1322     FreeHeap((void *)key);
1323   }
1324 
1325   return true;
1326 }
1327 
1328 //===========================================================================================================
1329 // Setting int/mixed/comp mode flags
1330 
1331 void Arguments::set_mode_flags(Mode mode) {
1332   // Set up default values for all flags.
1333   // If you add a flag to any of the branches below,
1334   // add a default value for it here.
1335   _mode                      = mode;
1336 
1337   // Ensure Agent_OnLoad has the correct initial values.
1338   // This may not be the final mode; mode may change later in onload phase.
1339   PropertyList_unique_add(&_system_properties, "java.vm.info",
1340                           VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1341 
1342   UseInterpreter             = true;
1343   UseCompiler                = true;
1344   UseLoopCounter             = true;
1345 
1346   // Default values may be platform/compiler dependent -
1347   // use the saved values
1348   ClipInlining               = Arguments::_ClipInlining;
1349   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1350   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1351   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1352 
1353   // Change from defaults based on mode
1354   switch (mode) {
1355   default:
1356     ShouldNotReachHere();
1357     break;
1358   case _int:
1359     UseCompiler              = false;
1360     UseLoopCounter           = false;
1361     AlwaysCompileLoopMethods = false;
1362     UseOnStackReplacement    = false;
1363     break;
1364   case _mixed:
1365     // same as default
1366     break;
1367   case _comp:
1368     UseInterpreter           = false;
1369     BackgroundCompilation    = false;
1370     ClipInlining             = false;
1371     break;
1372   }
1373 }
1374 
1375 // Conflict: required to use shared spaces (-Xshare:on), but
1376 // incompatible command line options were chosen.
1377 void Arguments::no_shared_spaces(const char* message) {
1378   if (RequireSharedSpaces) {
1379     aot_log_error(aot)("%s is incompatible with other specified options.",
1380                    CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS");
1381     if (CDSConfig::new_aot_flags_used()) {
1382       vm_exit_during_initialization("Unable to use AOT cache", message);
1383     } else {
1384       vm_exit_during_initialization("Unable to use shared archive", message);
1385     }
1386   } else {
1387     if (CDSConfig::new_aot_flags_used()) {
1388       log_warning(aot)("Unable to use AOT cache: %s", message);
1389     } else {
1390       aot_log_info(aot)("Unable to use shared archive: %s", message);
1391     }
1392     UseSharedSpaces = false;
1393   }
1394 }
1395 
1396 static void set_object_alignment() {
1397   // Object alignment.
1398   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1399   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1400   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1401   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1402   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1403   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1404 
1405   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1406   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1407 
1408   // Oop encoding heap max
1409   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1410 }
1411 
1412 size_t Arguments::max_heap_for_compressed_oops() {
1413   // Avoid sign flip.
1414   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1415   // We need to fit both the null page and the heap into the memory budget, while
1416   // keeping alignment constraints of the heap. To guarantee the latter, as the
1417   // null page is located before the heap, we pad the null page to the conservative
1418   // maximum alignment that the GC may ever impose upon the heap.
1419   size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1420                                                   _conservative_max_heap_alignment);
1421 
1422   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1423   NOT_LP64(ShouldNotReachHere(); return 0);
1424 }
1425 
1426 void Arguments::set_use_compressed_oops() {
1427 #ifdef _LP64
1428   // MaxHeapSize is not set up properly at this point, but
1429   // the only value that can override MaxHeapSize if we are
1430   // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1431   size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1432 
1433   if (max_heap_size <= max_heap_for_compressed_oops()) {
1434     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1435       FLAG_SET_ERGO(UseCompressedOops, true);
1436     }
1437   } else {
1438     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1439       warning("Max heap size too large for Compressed Oops");
1440       FLAG_SET_DEFAULT(UseCompressedOops, false);
1441     }
1442   }
1443 #endif // _LP64
1444 }
1445 
1446 void Arguments::set_conservative_max_heap_alignment() {
1447   // The conservative maximum required alignment for the heap is the maximum of
1448   // the alignments imposed by several sources: any requirements from the heap
1449   // itself and the maximum page size we may run the VM with.
1450   size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1451   _conservative_max_heap_alignment = MAX4(heap_alignment,
1452                                           os::vm_allocation_granularity(),
1453                                           os::max_page_size(),
1454                                           GCArguments::compute_heap_alignment());
1455 }
1456 
1457 jint Arguments::set_ergonomics_flags() {
1458   GCConfig::initialize();
1459 
1460   set_conservative_max_heap_alignment();
1461 
1462 #ifdef _LP64
1463   set_use_compressed_oops();
1464 
1465   // Also checks that certain machines are slower with compressed oops
1466   // in vm_version initialization code.
1467 #endif // _LP64
1468 
1469   return JNI_OK;
1470 }
1471 
1472 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
1473   size_t max_allocatable;
1474   size_t result = limit;
1475   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1476     // The AggressiveHeap check is a temporary workaround to avoid calling
1477     // GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1478     // selected. This works because AggressiveHeap implies UseParallelGC
1479     // where we know the ratio will be 1. Once the AggressiveHeap option is
1480     // removed, this can be cleaned up.
1481     size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1482     size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1483     result = MIN2(result, max_allocatable / fraction);
1484   }
1485   return result;
1486 }
1487 
1488 // Use static initialization to get the default before parsing
1489 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1490 
1491 void Arguments::set_heap_size() {
1492   julong phys_mem;
1493 
1494   // If the user specified one of these options, they
1495   // want specific memory sizing so do not limit memory
1496   // based on compressed oops addressability.
1497   // Also, memory limits will be calculated based on
1498   // available os physical memory, not our MaxRAM limit,
1499   // unless MaxRAM is also specified.
1500   bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1501                            !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1502                            !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1503                            !FLAG_IS_DEFAULT(MaxRAM));
1504   if (override_coop_limit) {
1505     if (FLAG_IS_DEFAULT(MaxRAM)) {
1506       phys_mem = os::physical_memory();
1507       FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1508     } else {
1509       phys_mem = (julong)MaxRAM;
1510     }
1511   } else {
1512     phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1513                                        : (julong)MaxRAM;
1514   }
1515 
1516   // If the maximum heap size has not been set with -Xmx,
1517   // then set it as fraction of the size of physical memory,
1518   // respecting the maximum and minimum sizes of the heap.
1519   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1520     julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1521     const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1522     if (reasonable_min < MaxHeapSize) {
1523       // Small physical memory, so use a minimum fraction of it for the heap
1524       reasonable_max = reasonable_min;
1525     } else {
1526       // Not-small physical memory, so require a heap at least
1527       // as large as MaxHeapSize
1528       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1529     }
1530 
1531     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1532       // Limit the heap size to ErgoHeapSizeLimit
1533       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1534     }
1535 
1536     reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1537 
1538     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1539       // An initial heap size was specified on the command line,
1540       // so be sure that the maximum size is consistent.  Done
1541       // after call to limit_heap_by_allocatable_memory because that
1542       // method might reduce the allocation size.
1543       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1544     } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1545       reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1546     }
1547 
1548 #ifdef _LP64
1549     if (UseCompressedOops || UseCompressedClassPointers) {
1550       // HeapBaseMinAddress can be greater than default but not less than.
1551       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1552         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1553           // matches compressed oops printing flags
1554           log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu"
1555                                      " (%zuG) which is greater than value given %zu",
1556                                      DefaultHeapBaseMinAddress,
1557                                      DefaultHeapBaseMinAddress/G,
1558                                      HeapBaseMinAddress);
1559           FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1560         }
1561       }
1562     }
1563     if (UseCompressedOops) {
1564       // Limit the heap size to the maximum possible when using compressed oops
1565       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1566 
1567       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1568         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1569         // but it should be not less than default MaxHeapSize.
1570         max_coop_heap -= HeapBaseMinAddress;
1571       }
1572 
1573       // If user specified flags prioritizing os physical
1574       // memory limits, then disable compressed oops if
1575       // limits exceed max_coop_heap and UseCompressedOops
1576       // was not specified.
1577       if (reasonable_max > max_coop_heap) {
1578         if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1579           aot_log_info(aot)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1580             " max heap %zu > compressed oop heap %zu. "
1581             "Please check the setting of MaxRAMPercentage %5.2f."
1582             ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1583           FLAG_SET_ERGO(UseCompressedOops, false);
1584         } else {
1585           reasonable_max = MIN2(reasonable_max, max_coop_heap);
1586         }
1587       }
1588     }
1589 #endif // _LP64
1590 
1591     log_trace(gc, heap)("  Maximum heap size %zu", (size_t) reasonable_max);
1592     FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1593   }
1594 
1595   // If the minimum or initial heap_size have not been set or requested to be set
1596   // ergonomically, set them accordingly.
1597   if (InitialHeapSize == 0 || MinHeapSize == 0) {
1598     julong reasonable_minimum = (julong)(OldSize + NewSize);
1599 
1600     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1601 
1602     reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1603 
1604     if (InitialHeapSize == 0) {
1605       julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1606       reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1607 
1608       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1609       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1610 
1611       FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1612       log_trace(gc, heap)("  Initial heap size %zu", InitialHeapSize);
1613     }
1614     // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1615     // synchronize with InitialHeapSize to avoid errors with the default value.
1616     if (MinHeapSize == 0) {
1617       FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1618       log_trace(gc, heap)("  Minimum heap size %zu", MinHeapSize);
1619     }
1620   }
1621 }
1622 
1623 // This option inspects the machine and attempts to set various
1624 // parameters to be optimal for long-running, memory allocation
1625 // intensive jobs.  It is intended for machines with large
1626 // amounts of cpu and memory.
1627 jint Arguments::set_aggressive_heap_flags() {
1628   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1629   // VM, but we may not be able to represent the total physical memory
1630   // available (like having 8gb of memory on a box but using a 32bit VM).
1631   // Thus, we need to make sure we're using a julong for intermediate
1632   // calculations.
1633   julong initHeapSize;
1634   julong total_memory = os::physical_memory();
1635 
1636   if (total_memory < (julong) 256 * M) {
1637     jio_fprintf(defaultStream::error_stream(),
1638             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1639     vm_exit(1);
1640   }
1641 
1642   // The heap size is half of available memory, or (at most)
1643   // all of possible memory less 160mb (leaving room for the OS
1644   // when using ISM).  This is the maximum; because adaptive sizing
1645   // is turned on below, the actual space used may be smaller.
1646 
1647   initHeapSize = MIN2(total_memory / (julong) 2,
1648           total_memory - (julong) 160 * M);
1649 
1650   initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1651 
1652   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1653     if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1654       return JNI_EINVAL;
1655     }
1656     if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1657       return JNI_EINVAL;
1658     }
1659     if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1660       return JNI_EINVAL;
1661     }
1662   }
1663   if (FLAG_IS_DEFAULT(NewSize)) {
1664     // Make the young generation 3/8ths of the total heap.
1665     if (FLAG_SET_CMDLINE(NewSize,
1666             ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1667       return JNI_EINVAL;
1668     }
1669     if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1670       return JNI_EINVAL;
1671     }
1672   }
1673 
1674 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
1675   FLAG_SET_DEFAULT(UseLargePages, true);
1676 #endif
1677 
1678   // Increase some data structure sizes for efficiency
1679   if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1680     return JNI_EINVAL;
1681   }
1682   if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1683     return JNI_EINVAL;
1684   }
1685 
1686   // See the OldPLABSize comment below, but replace 'after promotion'
1687   // with 'after copying'.  YoungPLABSize is the size of the survivor
1688   // space per-gc-thread buffers.  The default is 4kw.
1689   if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1690     return JNI_EINVAL;
1691   }
1692 
1693   // OldPLABSize is the size of the buffers in the old gen that
1694   // UseParallelGC uses to promote live data that doesn't fit in the
1695   // survivor spaces.  At any given time, there's one for each gc thread.
1696   // The default size is 1kw. These buffers are rarely used, since the
1697   // survivor spaces are usually big enough.  For specjbb, however, there
1698   // are occasions when there's lots of live data in the young gen
1699   // and we end up promoting some of it.  We don't have a definite
1700   // explanation for why bumping OldPLABSize helps, but the theory
1701   // is that a bigger PLAB results in retaining something like the
1702   // original allocation order after promotion, which improves mutator
1703   // locality.  A minor effect may be that larger PLABs reduce the
1704   // number of PLAB allocation events during gc.  The value of 8kw
1705   // was arrived at by experimenting with specjbb.
1706   if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1707     return JNI_EINVAL;
1708   }
1709 
1710   // Enable parallel GC and adaptive generation sizing
1711   if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1712     return JNI_EINVAL;
1713   }
1714 
1715   // Encourage steady state memory management
1716   if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1717     return JNI_EINVAL;
1718   }
1719 
1720   return JNI_OK;
1721 }
1722 
1723 // This must be called after ergonomics.
1724 void Arguments::set_bytecode_flags() {
1725   if (!RewriteBytecodes) {
1726     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1727   }
1728 }
1729 
1730 // Aggressive optimization flags
1731 jint Arguments::set_aggressive_opts_flags() {
1732 #ifdef COMPILER2
1733   if (AggressiveUnboxing) {
1734     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1735       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1736     } else if (!EliminateAutoBox) {
1737       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1738       AggressiveUnboxing = false;
1739     }
1740     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1741       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1742     } else if (!DoEscapeAnalysis) {
1743       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1744       AggressiveUnboxing = false;
1745     }
1746   }
1747   if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1748     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1749       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1750     }
1751     // Feed the cache size setting into the JDK
1752     char buffer[1024];
1753     jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax);
1754     if (!add_property(buffer)) {
1755       return JNI_ENOMEM;
1756     }
1757   }
1758 #endif
1759 
1760   return JNI_OK;
1761 }
1762 
1763 //===========================================================================================================
1764 
1765 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1766   if (_sun_java_launcher != _default_java_launcher) {
1767     os::free(const_cast<char*>(_sun_java_launcher));
1768   }
1769   _sun_java_launcher = os::strdup_check_oom(launcher);
1770 }
1771 
1772 bool Arguments::created_by_java_launcher() {
1773   assert(_sun_java_launcher != nullptr, "property must have value");
1774   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1775 }
1776 
1777 bool Arguments::executing_unit_tests() {
1778   return _executing_unit_tests;
1779 }
1780 
1781 //===========================================================================================================
1782 // Parsing of main arguments
1783 
1784 static unsigned int addreads_count = 0;
1785 static unsigned int addexports_count = 0;
1786 static unsigned int addopens_count = 0;
1787 static unsigned int patch_mod_count = 0;
1788 static unsigned int enable_native_access_count = 0;
1789 static bool patch_mod_javabase = false;
1790 
1791 // Check the consistency of vm_init_args
1792 bool Arguments::check_vm_args_consistency() {
1793   // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency()
1794   if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {
1795     return false;
1796   }
1797 
1798   // Method for adding checks for flag consistency.
1799   // The intent is to warn the user of all possible conflicts,
1800   // before returning an error.
1801   // Note: Needs platform-dependent factoring.
1802   bool status = true;
1803 
1804   if (TLABRefillWasteFraction == 0) {
1805     jio_fprintf(defaultStream::error_stream(),
1806                 "TLABRefillWasteFraction should be a denominator, "
1807                 "not %zu\n",
1808                 TLABRefillWasteFraction);
1809     status = false;
1810   }
1811 
1812   status = CompilerConfig::check_args_consistency(status);
1813 #if INCLUDE_JVMCI
1814   if (status && EnableJVMCI) {
1815     // Add the JVMCI module if not using libjvmci or EnableJVMCI
1816     // was explicitly set on the command line or in the jimage.
1817     if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) {
1818       if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) {
1819         return false;
1820       }
1821     }
1822   }
1823 #endif
1824 
1825 #if INCLUDE_JFR
1826   if (status && (FlightRecorderOptions || StartFlightRecording)) {
1827     if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) {
1828       return false;
1829     }
1830   }
1831 #endif
1832 
1833 #ifndef SUPPORT_RESERVED_STACK_AREA
1834   if (StackReservedPages != 0) {
1835     FLAG_SET_CMDLINE(StackReservedPages, 0);
1836     warning("Reserved Stack Area not supported on this platform");
1837   }
1838 #endif
1839 
1840   if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) {
1841     // ObjectMonitorTable requires lightweight locking.
1842     FLAG_SET_CMDLINE(UseObjectMonitorTable, false);
1843     warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT");
1844   }
1845 
1846 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1847   if (LockingMode == LM_MONITOR) {
1848     jio_fprintf(defaultStream::error_stream(),
1849                 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1850     return false;
1851   }
1852 #endif
1853   if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {
1854     jio_fprintf(defaultStream::error_stream(),
1855                 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1856     return false;
1857   }
1858   return status;
1859 }
1860 
1861 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1862   const char* option_type) {
1863   if (ignore) return false;
1864 
1865   const char* spacer = " ";
1866   if (option_type == nullptr) {
1867     option_type = ++spacer; // Set both to the empty string.
1868   }
1869 
1870   jio_fprintf(defaultStream::error_stream(),
1871               "Unrecognized %s%soption: %s\n", option_type, spacer,
1872               option->optionString);
1873   return true;
1874 }
1875 
1876 static const char* user_assertion_options[] = {
1877   "-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1878 };
1879 
1880 static const char* system_assertion_options[] = {
1881   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1882 };
1883 
1884 bool Arguments::parse_uint(const char* value,
1885                            uint* uint_arg,
1886                            uint min_size) {
1887   uint n;
1888   if (!parse_integer(value, &n)) {
1889     return false;
1890   }
1891   if (n >= min_size) {
1892     *uint_arg = n;
1893     return true;
1894   } else {
1895     return false;
1896   }
1897 }
1898 
1899 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
1900   assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1901   CDSConfig::check_internal_module_property(prop_name, prop_value);
1902   size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1903   char* property = AllocateHeap(prop_len, mtArguments);
1904   int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1905   if (ret < 0 || ret >= (int)prop_len) {
1906     FreeHeap(property);
1907     return false;
1908   }
1909   // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1910   // is enforced by checking is_internal_module_property(). We need the property to be writeable so
1911   // that multiple occurrences of the associated flag just causes the existing property value to be
1912   // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert
1913   // to a property after we have finished flag processing.
1914   bool added = add_property(property, WriteableProperty, internal);
1915   FreeHeap(property);
1916   return added;
1917 }
1918 
1919 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
1920   assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1921   CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1922   const unsigned int props_count_limit = 1000;
1923   const int max_digits = 3;
1924   const int extra_symbols_count = 3; // includes '.', '=', '\0'
1925 
1926   // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1927   if (count < props_count_limit) {
1928     size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1929     char* property = AllocateHeap(prop_len, mtArguments);
1930     int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1931     if (ret < 0 || ret >= (int)prop_len) {
1932       FreeHeap(property);
1933       jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1934       return false;
1935     }
1936     bool added = add_property(property, UnwriteableProperty, InternalProperty);
1937     FreeHeap(property);
1938     return added;
1939   }
1940 
1941   jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1942   return false;
1943 }
1944 
1945 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1946                                                   julong* long_arg,
1947                                                   julong min_size,
1948                                                   julong max_size) {
1949   if (!parse_integer(s, long_arg)) return arg_unreadable;
1950   return check_memory_size(*long_arg, min_size, max_size);
1951 }
1952 
1953 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) {
1954   // Save default settings for some mode flags
1955   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1956   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
1957   Arguments::_ClipInlining             = ClipInlining;
1958   Arguments::_BackgroundCompilation    = BackgroundCompilation;
1959 
1960   // Remember the default value of SharedBaseAddress.
1961   Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1962 
1963   // Setup flags for mixed which is the default
1964   set_mode_flags(_mixed);
1965 
1966   jint result;
1967   for (int i = 0; i < all_args->length(); i++) {
1968     result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin);
1969     if (result != JNI_OK) {
1970       return result;
1971     }
1972   }
1973 
1974   // Disable CDS for exploded image
1975   if (!has_jimage()) {
1976     no_shared_spaces("CDS disabled on exploded JDK");
1977   }
1978 
1979   // We need to ensure processor and memory resources have been properly
1980   // configured - which may rely on arguments we just processed - before
1981   // doing the final argument processing. Any argument processing that
1982   // needs to know about processor and memory resources must occur after
1983   // this point.
1984 
1985   os::init_container_support();
1986 
1987   SystemMemoryBarrier::initialize();
1988 
1989   // Do final processing now that all arguments have been parsed
1990   result = finalize_vm_init_args();
1991   if (result != JNI_OK) {
1992     return result;
1993   }
1994 
1995   return JNI_OK;
1996 }
1997 
1998 #if !INCLUDE_JVMTI || INCLUDE_CDS
1999 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2000 // represents a valid JDWP agent.  is_path==true denotes that we
2001 // are dealing with -agentpath (case where name is a path), otherwise with
2002 // -agentlib
2003 static bool valid_jdwp_agent(char *name, bool is_path) {
2004   char *_name;
2005   const char *_jdwp = "jdwp";
2006   size_t _len_jdwp, _len_prefix;
2007 
2008   if (is_path) {
2009     if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {
2010       return false;
2011     }
2012 
2013     _name++;  // skip past last path separator
2014     _len_prefix = strlen(JNI_LIB_PREFIX);
2015 
2016     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2017       return false;
2018     }
2019 
2020     _name += _len_prefix;
2021     _len_jdwp = strlen(_jdwp);
2022 
2023     if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2024       _name += _len_jdwp;
2025     }
2026     else {
2027       return false;
2028     }
2029 
2030     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2031       return false;
2032     }
2033 
2034     return true;
2035   }
2036 
2037   if (strcmp(name, _jdwp) == 0) {
2038     return true;
2039   }
2040 
2041   return false;
2042 }
2043 #endif
2044 
2045 int Arguments::process_patch_mod_option(const char* patch_mod_tail) {
2046   // --patch-module=<module>=<file>(<pathsep><file>)*
2047   assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2048   // Find the equal sign between the module name and the path specification
2049   const char* module_equal = strchr(patch_mod_tail, '=');
2050   if (module_equal == nullptr) {
2051     jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2052     return JNI_ERR;
2053   } else {
2054     // Pick out the module name
2055     size_t module_len = module_equal - patch_mod_tail;
2056     char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2057     if (module_name != nullptr) {
2058       memcpy(module_name, patch_mod_tail, module_len);
2059       *(module_name + module_len) = '\0';
2060       // The path piece begins one past the module_equal sign
2061       add_patch_mod_prefix(module_name, module_equal + 1);
2062       FREE_C_HEAP_ARRAY(char, module_name);
2063       if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2064         return JNI_ENOMEM;
2065       }
2066     } else {
2067       return JNI_ENOMEM;
2068     }
2069   }
2070   return JNI_OK;
2071 }
2072 
2073 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2074 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2075   // The min and max sizes match the values in globals.hpp, but scaled
2076   // with K. The values have been chosen so that alignment with page
2077   // size doesn't change the max value, which makes the conversions
2078   // back and forth between Xss value and ThreadStackSize value easier.
2079   // The values have also been chosen to fit inside a 32-bit signed type.
2080   const julong min_ThreadStackSize = 0;
2081   const julong max_ThreadStackSize = 1 * M;
2082 
2083   // Make sure the above values match the range set in globals.hpp
2084   const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2085   assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2086   assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2087 
2088   const julong min_size = min_ThreadStackSize * K;
2089   const julong max_size = max_ThreadStackSize * K;
2090 
2091   assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2092 
2093   julong size = 0;
2094   ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2095   if (errcode != arg_in_range) {
2096     bool silent = (option == nullptr); // Allow testing to silence error messages
2097     if (!silent) {
2098       jio_fprintf(defaultStream::error_stream(),
2099                   "Invalid thread stack size: %s\n", option->optionString);
2100       describe_range_error(errcode);
2101     }
2102     return JNI_EINVAL;
2103   }
2104 
2105   // Internally track ThreadStackSize in units of 1024 bytes.
2106   const julong size_aligned = align_up(size, K);
2107   assert(size <= size_aligned,
2108          "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2109          size, size_aligned);
2110 
2111   const julong size_in_K = size_aligned / K;
2112   assert(size_in_K < (julong)max_intx,
2113          "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2114          size_in_K);
2115 
2116   // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2117   const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2118   assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2119          "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2120          max_expanded, size_in_K);
2121 
2122   *out_ThreadStackSize = (intx)size_in_K;
2123 
2124   return JNI_OK;
2125 }
2126 
2127 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) {
2128   // For match_option to return remaining or value part of option string
2129   const char* tail;
2130 
2131   // iterate over arguments
2132   for (int index = 0; index < args->nOptions; index++) {
2133     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2134 
2135     const JavaVMOption* option = args->options + index;
2136 
2137     if (!match_option(option, "-Djava.class.path", &tail) &&
2138         !match_option(option, "-Dsun.java.command", &tail) &&
2139         !match_option(option, "-Dsun.java.launcher", &tail)) {
2140 
2141         // add all jvm options to the jvm_args string. This string
2142         // is used later to set the java.vm.args PerfData string constant.
2143         // the -Djava.class.path and the -Dsun.java.command options are
2144         // omitted from jvm_args string as each have their own PerfData
2145         // string constant object.
2146         build_jvm_args(option->optionString);
2147     }
2148 
2149     // -verbose:[class/module/gc/jni]
2150     if (match_option(option, "-verbose", &tail)) {
2151       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2152         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2153         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2154       } else if (!strcmp(tail, ":module")) {
2155         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2156         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2157       } else if (!strcmp(tail, ":gc")) {
2158         if (_legacyGCLogging.lastFlag == 0) {
2159           _legacyGCLogging.lastFlag = 1;
2160         }
2161       } else if (!strcmp(tail, ":jni")) {
2162         LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2163       }
2164     // -da / -ea / -disableassertions / -enableassertions
2165     // These accept an optional class/package name separated by a colon, e.g.,
2166     // -da:java.lang.Thread.
2167     } else if (match_option(option, user_assertion_options, &tail, true)) {
2168       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2169       if (*tail == '\0') {
2170         JavaAssertions::setUserClassDefault(enable);
2171       } else {
2172         assert(*tail == ':', "bogus match by match_option()");
2173         JavaAssertions::addOption(tail + 1, enable);
2174       }
2175     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2176     } else if (match_option(option, system_assertion_options, &tail, false)) {
2177       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2178       JavaAssertions::setSystemClassDefault(enable);
2179     // -bootclasspath:
2180     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2181         jio_fprintf(defaultStream::output_stream(),
2182           "-Xbootclasspath is no longer a supported option.\n");
2183         return JNI_EINVAL;
2184     // -bootclasspath/a:
2185     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2186       Arguments::append_sysclasspath(tail);
2187     // -bootclasspath/p:
2188     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2189         jio_fprintf(defaultStream::output_stream(),
2190           "-Xbootclasspath/p is no longer a supported option.\n");
2191         return JNI_EINVAL;
2192     // -Xrun
2193     } else if (match_option(option, "-Xrun", &tail)) {
2194       if (tail != nullptr) {
2195         const char* pos = strchr(tail, ':');
2196         size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2197         char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2198         jio_snprintf(name, len + 1, "%s", tail);
2199 
2200         char *options = nullptr;
2201         if(pos != nullptr) {
2202           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2203           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2204         }
2205 #if !INCLUDE_JVMTI
2206         if (strcmp(name, "jdwp") == 0) {
2207           jio_fprintf(defaultStream::error_stream(),
2208             "Debugging agents are not supported in this VM\n");
2209           return JNI_ERR;
2210         }
2211 #endif // !INCLUDE_JVMTI
2212         JvmtiAgentList::add_xrun(name, options, false);
2213         FREE_C_HEAP_ARRAY(char, name);
2214         FREE_C_HEAP_ARRAY(char, options);
2215       }
2216     } else if (match_option(option, "--add-reads=", &tail)) {
2217       if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {
2218         return JNI_ENOMEM;
2219       }
2220     } else if (match_option(option, "--add-exports=", &tail)) {
2221       if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {
2222         return JNI_ENOMEM;
2223       }
2224     } else if (match_option(option, "--add-opens=", &tail)) {
2225       if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {
2226         return JNI_ENOMEM;
2227       }
2228     } else if (match_option(option, "--add-modules=", &tail)) {
2229       if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) {
2230         return JNI_ENOMEM;
2231       }
2232 #if INCLUDE_JVMCI
2233       if (!_jvmci_module_added) {
2234         const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci");
2235         if (jvmci_module != nullptr) {
2236           char before = *(jvmci_module - 1);
2237           char after  = *(jvmci_module + strlen("jdk.internal.vm.ci"));
2238           if ((before == '=' || before == ',') && (after == '\0' || after == ',')) {
2239             FLAG_SET_DEFAULT(EnableJVMCI, true);
2240             _jvmci_module_added = true;
2241           }
2242         }
2243       }
2244 #endif
2245     } else if (match_option(option, "--enable-native-access=", &tail)) {
2246       if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {
2247         return JNI_ENOMEM;
2248       }
2249     } else if (match_option(option, "--illegal-native-access=", &tail)) {
2250       if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) {
2251         return JNI_ENOMEM;
2252       }
2253     } else if (match_option(option, "--limit-modules=", &tail)) {
2254       if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {
2255         return JNI_ENOMEM;
2256       }
2257     } else if (match_option(option, "--module-path=", &tail)) {
2258       if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {
2259         return JNI_ENOMEM;
2260       }
2261     } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2262       if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2263         return JNI_ENOMEM;
2264       }
2265     } else if (match_option(option, "--patch-module=", &tail)) {
2266       // --patch-module=<module>=<file>(<pathsep><file>)*
2267       int res = process_patch_mod_option(tail);
2268       if (res != JNI_OK) {
2269         return res;
2270       }
2271     } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {
2272       if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {
2273         PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2274                                 AddProperty, WriteableProperty, InternalProperty);
2275       } else {
2276         jio_fprintf(defaultStream::error_stream(),
2277                     "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2278         return JNI_ERR;
2279       }
2280     } else if (match_option(option, "--illegal-access=", &tail)) {
2281       char version[256];
2282       JDK_Version::jdk(17).to_string(version, sizeof(version));
2283       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2284     // -agentlib and -agentpath
2285     } else if (match_option(option, "-agentlib:", &tail) ||
2286           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2287       if(tail != nullptr) {
2288         const char* pos = strchr(tail, '=');
2289         char* name;
2290         if (pos == nullptr) {
2291           name = os::strdup_check_oom(tail, mtArguments);
2292         } else {
2293           size_t len = pos - tail;
2294           name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2295           memcpy(name, tail, len);
2296           name[len] = '\0';
2297         }
2298 
2299         char *options = nullptr;
2300         if(pos != nullptr) {
2301           options = os::strdup_check_oom(pos + 1, mtArguments);
2302         }
2303 #if !INCLUDE_JVMTI
2304         if (valid_jdwp_agent(name, is_absolute_path)) {
2305           jio_fprintf(defaultStream::error_stream(),
2306             "Debugging agents are not supported in this VM\n");
2307           return JNI_ERR;
2308         }
2309 #elif INCLUDE_CDS
2310         if (valid_jdwp_agent(name, is_absolute_path)) {
2311           _has_jdwp_agent = true;
2312         }
2313 #endif // !INCLUDE_JVMTI
2314         JvmtiAgentList::add(name, options, is_absolute_path);
2315         os::free(name);
2316         os::free(options);
2317       }
2318     // -javaagent
2319     } else if (match_option(option, "-javaagent:", &tail)) {
2320 #if !INCLUDE_JVMTI
2321       jio_fprintf(defaultStream::error_stream(),
2322         "Instrumentation agents are not supported in this VM\n");
2323       return JNI_ERR;
2324 #else
2325       if (tail != nullptr) {
2326         size_t length = strlen(tail) + 1;
2327         char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2328         jio_snprintf(options, length, "%s", tail);
2329         JvmtiAgentList::add("instrument", options, false);
2330         FREE_C_HEAP_ARRAY(char, options);
2331 
2332         // java agents need module java.instrument
2333         if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) {
2334           return JNI_ENOMEM;
2335         }
2336       }
2337 #endif // !INCLUDE_JVMTI
2338     // --enable_preview
2339     } else if (match_option(option, "--enable-preview")) {
2340       set_enable_preview();
2341     // -Xnoclassgc
2342     } else if (match_option(option, "-Xnoclassgc")) {
2343       if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2344         return JNI_EINVAL;
2345       }
2346     // -Xbatch
2347     } else if (match_option(option, "-Xbatch")) {
2348       if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2349         return JNI_EINVAL;
2350       }
2351     // -Xmn for compatibility with other JVM vendors
2352     } else if (match_option(option, "-Xmn", &tail)) {
2353       julong long_initial_young_size = 0;
2354       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2355       if (errcode != arg_in_range) {
2356         jio_fprintf(defaultStream::error_stream(),
2357                     "Invalid initial young generation size: %s\n", option->optionString);
2358         describe_range_error(errcode);
2359         return JNI_EINVAL;
2360       }
2361       if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2362         return JNI_EINVAL;
2363       }
2364       if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2365         return JNI_EINVAL;
2366       }
2367     // -Xms
2368     } else if (match_option(option, "-Xms", &tail)) {
2369       julong size = 0;
2370       // an initial heap size of 0 means automatically determine
2371       ArgsRange errcode = parse_memory_size(tail, &size, 0);
2372       if (errcode != arg_in_range) {
2373         jio_fprintf(defaultStream::error_stream(),
2374                     "Invalid initial heap size: %s\n", option->optionString);
2375         describe_range_error(errcode);
2376         return JNI_EINVAL;
2377       }
2378       if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2379         return JNI_EINVAL;
2380       }
2381       if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2382         return JNI_EINVAL;
2383       }
2384     // -Xmx
2385     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2386       julong long_max_heap_size = 0;
2387       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2388       if (errcode != arg_in_range) {
2389         jio_fprintf(defaultStream::error_stream(),
2390                     "Invalid maximum heap size: %s\n", option->optionString);
2391         describe_range_error(errcode);
2392         return JNI_EINVAL;
2393       }
2394       if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2395         return JNI_EINVAL;
2396       }
2397     // Xmaxf
2398     } else if (match_option(option, "-Xmaxf", &tail)) {
2399       char* err;
2400       int maxf = (int)(strtod(tail, &err) * 100);
2401       if (*err != '\0' || *tail == '\0') {
2402         jio_fprintf(defaultStream::error_stream(),
2403                     "Bad max heap free percentage size: %s\n",
2404                     option->optionString);
2405         return JNI_EINVAL;
2406       } else {
2407         if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2408             return JNI_EINVAL;
2409         }
2410       }
2411     // Xminf
2412     } else if (match_option(option, "-Xminf", &tail)) {
2413       char* err;
2414       int minf = (int)(strtod(tail, &err) * 100);
2415       if (*err != '\0' || *tail == '\0') {
2416         jio_fprintf(defaultStream::error_stream(),
2417                     "Bad min heap free percentage size: %s\n",
2418                     option->optionString);
2419         return JNI_EINVAL;
2420       } else {
2421         if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2422           return JNI_EINVAL;
2423         }
2424       }
2425     // -Xss
2426     } else if (match_option(option, "-Xss", &tail)) {
2427       intx value = 0;
2428       jint err = parse_xss(option, tail, &value);
2429       if (err != JNI_OK) {
2430         return err;
2431       }
2432       if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2433         return JNI_EINVAL;
2434       }
2435     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2436                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2437       julong long_ReservedCodeCacheSize = 0;
2438 
2439       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2440       if (errcode != arg_in_range) {
2441         jio_fprintf(defaultStream::error_stream(),
2442                     "Invalid maximum code cache size: %s.\n", option->optionString);
2443         return JNI_EINVAL;
2444       }
2445       if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2446         return JNI_EINVAL;
2447       }
2448     // -green
2449     } else if (match_option(option, "-green")) {
2450       jio_fprintf(defaultStream::error_stream(),
2451                   "Green threads support not available\n");
2452           return JNI_EINVAL;
2453     // -native
2454     } else if (match_option(option, "-native")) {
2455           // HotSpot always uses native threads, ignore silently for compatibility
2456     // -Xrs
2457     } else if (match_option(option, "-Xrs")) {
2458           // Classic/EVM option, new functionality
2459       if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2460         return JNI_EINVAL;
2461       }
2462       // -Xprof
2463     } else if (match_option(option, "-Xprof")) {
2464       char version[256];
2465       // Obsolete in JDK 10
2466       JDK_Version::jdk(10).to_string(version, sizeof(version));
2467       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2468     // -Xinternalversion
2469     } else if (match_option(option, "-Xinternalversion")) {
2470       jio_fprintf(defaultStream::output_stream(), "%s\n",
2471                   VM_Version::internal_vm_info_string());
2472       vm_exit(0);
2473 #ifndef PRODUCT
2474     // -Xprintflags
2475     } else if (match_option(option, "-Xprintflags")) {
2476       JVMFlag::printFlags(tty, false);
2477       vm_exit(0);
2478 #endif
2479     // -D
2480     } else if (match_option(option, "-D", &tail)) {
2481       const char* value;
2482       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2483             *value!= '\0' && strcmp(value, "\"\"") != 0) {
2484         // abort if -Djava.endorsed.dirs is set
2485         jio_fprintf(defaultStream::output_stream(),
2486           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2487           "in modular form will be supported via the concept of upgradeable modules.\n", value);
2488         return JNI_EINVAL;
2489       }
2490       if (match_option(option, "-Djava.ext.dirs=", &value) &&
2491             *value != '\0' && strcmp(value, "\"\"") != 0) {
2492         // abort if -Djava.ext.dirs is set
2493         jio_fprintf(defaultStream::output_stream(),
2494           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
2495         return JNI_EINVAL;
2496       }
2497       // Check for module related properties.  They must be set using the modules
2498       // options. For example: use "--add-modules=java.sql", not
2499       // "-Djdk.module.addmods=java.sql"
2500       if (is_internal_module_property(option->optionString + 2)) {
2501         needs_module_property_warning = true;
2502         continue;
2503       }
2504       if (!add_property(tail)) {
2505         return JNI_ENOMEM;
2506       }
2507       // Out of the box management support
2508       if (match_option(option, "-Dcom.sun.management", &tail)) {
2509 #if INCLUDE_MANAGEMENT
2510         if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2511           return JNI_EINVAL;
2512         }
2513         // management agent in module jdk.management.agent
2514         if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) {
2515           return JNI_ENOMEM;
2516         }
2517 #else
2518         jio_fprintf(defaultStream::output_stream(),
2519           "-Dcom.sun.management is not supported in this VM.\n");
2520         return JNI_ERR;
2521 #endif
2522       }
2523     // -Xint
2524     } else if (match_option(option, "-Xint")) {
2525           set_mode_flags(_int);
2526           mode_flag_cmd_line = true;
2527     // -Xmixed
2528     } else if (match_option(option, "-Xmixed")) {
2529           set_mode_flags(_mixed);
2530           mode_flag_cmd_line = true;
2531     // -Xcomp
2532     } else if (match_option(option, "-Xcomp")) {
2533       // for testing the compiler; turn off all flags that inhibit compilation
2534           set_mode_flags(_comp);
2535           mode_flag_cmd_line = true;
2536     // -Xshare:dump
2537     } else if (match_option(option, "-Xshare:dump")) {
2538       CDSConfig::enable_dumping_static_archive();
2539       CDSConfig::set_old_cds_flags_used();
2540     // -Xshare:on
2541     } else if (match_option(option, "-Xshare:on")) {
2542       UseSharedSpaces = true;
2543       RequireSharedSpaces = true;
2544       CDSConfig::set_old_cds_flags_used();
2545     // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2546     } else if (match_option(option, "-Xshare:auto")) {
2547       UseSharedSpaces = true;
2548       RequireSharedSpaces = false;
2549       xshare_auto_cmd_line = true;
2550       CDSConfig::set_old_cds_flags_used();
2551     // -Xshare:off
2552     } else if (match_option(option, "-Xshare:off")) {
2553       UseSharedSpaces = false;
2554       RequireSharedSpaces = false;
2555       CDSConfig::set_old_cds_flags_used();
2556     // -Xverify
2557     } else if (match_option(option, "-Xverify", &tail)) {
2558       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2559         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2560           return JNI_EINVAL;
2561         }
2562         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2563           return JNI_EINVAL;
2564         }
2565       } else if (strcmp(tail, ":remote") == 0) {
2566         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2567           return JNI_EINVAL;
2568         }
2569         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2570           return JNI_EINVAL;
2571         }
2572       } else if (strcmp(tail, ":none") == 0) {
2573         if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2574           return JNI_EINVAL;
2575         }
2576         if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2577           return JNI_EINVAL;
2578         }
2579         warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2580       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2581         return JNI_EINVAL;
2582       }
2583     // -Xdebug
2584     } else if (match_option(option, "-Xdebug")) {
2585       warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");
2586     } else if (match_option(option, "-Xloggc:", &tail)) {
2587       // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2588       log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2589       _legacyGCLogging.lastFlag = 2;
2590       _legacyGCLogging.file = os::strdup_check_oom(tail);
2591     } else if (match_option(option, "-Xlog", &tail)) {
2592       bool ret = false;
2593       if (strcmp(tail, ":help") == 0) {
2594         fileStream stream(defaultStream::output_stream());
2595         LogConfiguration::print_command_line_help(&stream);
2596         vm_exit(0);
2597       } else if (strcmp(tail, ":disable") == 0) {
2598         LogConfiguration::disable_logging();
2599         ret = true;
2600       } else if (strncmp(tail, ":async", strlen(":async")) == 0) {
2601         const char* async_tail = tail + strlen(":async");
2602         ret = LogConfiguration::parse_async_argument(async_tail);
2603       } else if (*tail == '\0') {
2604         ret = LogConfiguration::parse_command_line_arguments();
2605         assert(ret, "-Xlog without arguments should never fail to parse");
2606       } else if (*tail == ':') {
2607         ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2608       }
2609       if (ret == false) {
2610         jio_fprintf(defaultStream::error_stream(),
2611                     "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2612                     tail);
2613         return JNI_EINVAL;
2614       }
2615     // JNI hooks
2616     } else if (match_option(option, "-Xcheck", &tail)) {
2617       if (!strcmp(tail, ":jni")) {
2618 #if !INCLUDE_JNI_CHECK
2619         warning("JNI CHECKING is not supported in this VM");
2620 #else
2621         CheckJNICalls = true;
2622 #endif // INCLUDE_JNI_CHECK
2623       } else if (is_bad_option(option, args->ignoreUnrecognized,
2624                                      "check")) {
2625         return JNI_EINVAL;
2626       }
2627     } else if (match_option(option, "vfprintf")) {
2628       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2629     } else if (match_option(option, "exit")) {
2630       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2631     } else if (match_option(option, "abort")) {
2632       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2633     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2634     // and the last option wins.
2635     } else if (match_option(option, "-XX:+NeverTenure")) {
2636       if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2637         return JNI_EINVAL;
2638       }
2639       if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2640         return JNI_EINVAL;
2641       }
2642       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {
2643         return JNI_EINVAL;
2644       }
2645     } else if (match_option(option, "-XX:+AlwaysTenure")) {
2646       if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2647         return JNI_EINVAL;
2648       }
2649       if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2650         return JNI_EINVAL;
2651       }
2652       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2653         return JNI_EINVAL;
2654       }
2655     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2656       uint max_tenuring_thresh = 0;
2657       if (!parse_uint(tail, &max_tenuring_thresh, 0)) {
2658         jio_fprintf(defaultStream::error_stream(),
2659                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2660         return JNI_EINVAL;
2661       }
2662 
2663       if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2664         return JNI_EINVAL;
2665       }
2666 
2667       if (MaxTenuringThreshold == 0) {
2668         if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2669           return JNI_EINVAL;
2670         }
2671         if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2672           return JNI_EINVAL;
2673         }
2674       } else {
2675         if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2676           return JNI_EINVAL;
2677         }
2678         if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2679           return JNI_EINVAL;
2680         }
2681       }
2682     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2683       if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2684         return JNI_EINVAL;
2685       }
2686       if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2687         return JNI_EINVAL;
2688       }
2689     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2690       if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2691         return JNI_EINVAL;
2692       }
2693       if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2694         return JNI_EINVAL;
2695       }
2696     } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2697       if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2698         return JNI_EINVAL;
2699       }
2700       if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2701         return JNI_EINVAL;
2702       }
2703     } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2704       if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2705         return JNI_EINVAL;
2706       }
2707       if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2708         return JNI_EINVAL;
2709       }
2710     } else if (match_option(option, "--finalization=", &tail)) {
2711       if (strcmp(tail, "enabled") == 0) {
2712         InstanceKlass::set_finalization_enabled(true);
2713       } else if (strcmp(tail, "disabled") == 0) {
2714         InstanceKlass::set_finalization_enabled(false);
2715       } else {
2716         jio_fprintf(defaultStream::error_stream(),
2717                     "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2718                     tail);
2719         return JNI_EINVAL;
2720       }
2721 #if !defined(DTRACE_ENABLED)
2722     } else if (match_option(option, "-XX:+DTraceMethodProbes")) {
2723       jio_fprintf(defaultStream::error_stream(),
2724                   "DTraceMethodProbes flag is not applicable for this configuration\n");
2725       return JNI_EINVAL;
2726     } else if (match_option(option, "-XX:+DTraceAllocProbes")) {
2727       jio_fprintf(defaultStream::error_stream(),
2728                   "DTraceAllocProbes flag is not applicable for this configuration\n");
2729       return JNI_EINVAL;
2730     } else if (match_option(option, "-XX:+DTraceMonitorProbes")) {
2731       jio_fprintf(defaultStream::error_stream(),
2732                   "DTraceMonitorProbes flag is not applicable for this configuration\n");
2733       return JNI_EINVAL;
2734 #endif // !defined(DTRACE_ENABLED)
2735 #ifdef ASSERT
2736     } else if (match_option(option, "-XX:+FullGCALot")) {
2737       if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2738         return JNI_EINVAL;
2739       }
2740 #endif
2741 #if !INCLUDE_MANAGEMENT
2742     } else if (match_option(option, "-XX:+ManagementServer")) {
2743         jio_fprintf(defaultStream::error_stream(),
2744           "ManagementServer is not supported in this VM.\n");
2745         return JNI_ERR;
2746 #endif // INCLUDE_MANAGEMENT
2747 #if INCLUDE_JVMCI
2748     } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {
2749       if (EnableJVMCIProduct) {
2750         jio_fprintf(defaultStream::error_stream(),
2751                   "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2752         return JNI_EINVAL;
2753       }
2754     } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {
2755       bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2756       if (use_graal_jit) {
2757         const char* jvmci_compiler = get_property("jvmci.Compiler");
2758         if (jvmci_compiler != nullptr) {
2759           if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {
2760             jio_fprintf(defaultStream::error_stream(),
2761               "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2762             return JNI_ERR;
2763           }
2764         } else if (!add_property("jvmci.Compiler=graal")) {
2765             return JNI_ENOMEM;
2766         }
2767       }
2768 
2769       // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2770       if (EnableJVMCIProduct) {
2771         continue;
2772       }
2773       JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");
2774       // Allow this flag if it has been unlocked.
2775       if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {
2776         if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {
2777           jio_fprintf(defaultStream::error_stream(),
2778             "Unable to enable JVMCI in product mode\n");
2779           return JNI_ERR;
2780         }
2781       }
2782       // The flag was locked so process normally to report that error
2783       else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {
2784         return JNI_EINVAL;
2785       }
2786 #endif // INCLUDE_JVMCI
2787 #if INCLUDE_JFR
2788     } else if (match_jfr_option(&option)) {
2789       return JNI_EINVAL;
2790 #endif
2791     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2792       // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2793       // already been handled
2794       if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2795           (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2796         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2797           return JNI_EINVAL;
2798         }
2799       }
2800     // Unknown option
2801     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2802       return JNI_ERR;
2803     }
2804   }
2805 
2806   // PrintSharedArchiveAndExit will turn on
2807   //   -Xshare:on
2808   //   -Xlog:class+path=info
2809   if (PrintSharedArchiveAndExit) {
2810     UseSharedSpaces = true;
2811     RequireSharedSpaces = true;
2812     LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2813   }
2814 
2815   fix_appclasspath();
2816 
2817   return JNI_OK;
2818 }
2819 
2820 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) {
2821   // For java.base check for duplicate --patch-module options being specified on the command line.
2822   // This check is only required for java.base, all other duplicate module specifications
2823   // will be checked during module system initialization.  The module system initialization
2824   // will throw an ExceptionInInitializerError if this situation occurs.
2825   if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
2826     if (patch_mod_javabase) {
2827       vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
2828     } else {
2829       patch_mod_javabase = true;
2830     }
2831   }
2832 
2833   // Create GrowableArray lazily, only if --patch-module has been specified
2834   if (_patch_mod_prefix == nullptr) {
2835     _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2836   }
2837 
2838   _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2839 }
2840 
2841 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2842 //
2843 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
2844 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2845 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2846 // path is treated as the current directory.
2847 //
2848 // This causes problems with CDS, which requires that all directories specified in the classpath
2849 // must be empty. In most cases, applications do NOT want to load classes from the current
2850 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2851 // scripts compatible with CDS.
2852 void Arguments::fix_appclasspath() {
2853   if (IgnoreEmptyClassPaths) {
2854     const char separator = *os::path_separator();
2855     const char* src = _java_class_path->value();
2856 
2857     // skip over all the leading empty paths
2858     while (*src == separator) {
2859       src ++;
2860     }
2861 
2862     char* copy = os::strdup_check_oom(src, mtArguments);
2863 
2864     // trim all trailing empty paths
2865     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
2866       *tail = '\0';
2867     }
2868 
2869     char from[3] = {separator, separator, '\0'};
2870     char to  [2] = {separator, '\0'};
2871     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
2872       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2873       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2874     }
2875 
2876     _java_class_path->set_writeable_value(copy);
2877     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2878   }
2879 }
2880 
2881 jint Arguments::finalize_vm_init_args() {
2882   // check if the default lib/endorsed directory exists; if so, error
2883   char path[JVM_MAXPATHLEN];
2884   const char* fileSep = os::file_separator();
2885   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2886 
2887   DIR* dir = os::opendir(path);
2888   if (dir != nullptr) {
2889     jio_fprintf(defaultStream::output_stream(),
2890       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2891       "in modular form will be supported via the concept of upgradeable modules.\n");
2892     os::closedir(dir);
2893     return JNI_ERR;
2894   }
2895 
2896   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2897   dir = os::opendir(path);
2898   if (dir != nullptr) {
2899     jio_fprintf(defaultStream::output_stream(),
2900       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2901       "Use -classpath instead.\n.");
2902     os::closedir(dir);
2903     return JNI_ERR;
2904   }
2905 
2906   // This must be done after all arguments have been processed
2907   // and the container support has been initialized since AggressiveHeap
2908   // relies on the amount of total memory available.
2909   if (AggressiveHeap) {
2910     jint result = set_aggressive_heap_flags();
2911     if (result != JNI_OK) {
2912       return result;
2913     }
2914   }
2915 
2916   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2917   // but like -Xint, leave compilation thresholds unaffected.
2918   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2919   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
2920     set_mode_flags(_int);
2921   }
2922 
2923 #ifdef ZERO
2924   // Zero always runs in interpreted mode
2925   set_mode_flags(_int);
2926 #endif
2927 
2928   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2929   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
2930     FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2931   }
2932 
2933 #if !COMPILER2_OR_JVMCI
2934   // Don't degrade server performance for footprint
2935   if (FLAG_IS_DEFAULT(UseLargePages) &&
2936       MaxHeapSize < LargePageHeapSizeThreshold) {
2937     // No need for large granularity pages w/small heaps.
2938     // Note that large pages are enabled/disabled for both the
2939     // Java heap and the code cache.
2940     FLAG_SET_DEFAULT(UseLargePages, false);
2941   }
2942 
2943   UNSUPPORTED_OPTION(ProfileInterpreter);
2944 #endif
2945 
2946   // Parse the CompilationMode flag
2947   if (!CompilationModeFlag::initialize()) {
2948     return JNI_ERR;
2949   }
2950 
2951   if (!check_vm_args_consistency()) {
2952     return JNI_ERR;
2953   }
2954 
2955 
2956 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2957   UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2958 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
2959 
2960   return JNI_OK;
2961 }
2962 
2963 // Helper class for controlling the lifetime of JavaVMInitArgs
2964 // objects.  The contents of the JavaVMInitArgs are guaranteed to be
2965 // deleted on the destruction of the ScopedVMInitArgs object.
2966 class ScopedVMInitArgs : public StackObj {
2967  private:
2968   JavaVMInitArgs _args;
2969   char*          _container_name;
2970   bool           _is_set;
2971   char*          _vm_options_file_arg;
2972 
2973  public:
2974   ScopedVMInitArgs(const char *container_name) {
2975     _args.version = JNI_VERSION_1_2;
2976     _args.nOptions = 0;
2977     _args.options = nullptr;
2978     _args.ignoreUnrecognized = false;
2979     _container_name = (char *)container_name;
2980     _is_set = false;
2981     _vm_options_file_arg = nullptr;
2982   }
2983 
2984   // Populates the JavaVMInitArgs object represented by this
2985   // ScopedVMInitArgs object with the arguments in options.  The
2986   // allocated memory is deleted by the destructor.  If this method
2987   // returns anything other than JNI_OK, then this object is in a
2988   // partially constructed state, and should be abandoned.
2989   jint set_args(const GrowableArrayView<JavaVMOption>* options) {
2990     _is_set = true;
2991     JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2992         JavaVMOption, options->length(), mtArguments);
2993     if (options_arr == nullptr) {
2994       return JNI_ENOMEM;
2995     }
2996     _args.options = options_arr;
2997 
2998     for (int i = 0; i < options->length(); i++) {
2999       options_arr[i] = options->at(i);
3000       options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3001       if (options_arr[i].optionString == nullptr) {
3002         // Rely on the destructor to do cleanup.
3003         _args.nOptions = i;
3004         return JNI_ENOMEM;
3005       }
3006     }
3007 
3008     _args.nOptions = options->length();
3009     _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3010     return JNI_OK;
3011   }
3012 
3013   JavaVMInitArgs* get()             { return &_args; }
3014   char* container_name()            { return _container_name; }
3015   bool  is_set()                    { return _is_set; }
3016   bool  found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }
3017   char* vm_options_file_arg()       { return _vm_options_file_arg; }
3018 
3019   void set_vm_options_file_arg(const char *vm_options_file_arg) {
3020     if (_vm_options_file_arg != nullptr) {
3021       os::free(_vm_options_file_arg);
3022     }
3023     _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3024   }
3025 
3026   ~ScopedVMInitArgs() {
3027     if (_vm_options_file_arg != nullptr) {
3028       os::free(_vm_options_file_arg);
3029     }
3030     if (_args.options == nullptr) return;
3031     for (int i = 0; i < _args.nOptions; i++) {
3032       os::free(_args.options[i].optionString);
3033     }
3034     FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3035   }
3036 
3037   // Insert options into this option list, to replace option at
3038   // vm_options_file_pos (-XX:VMOptionsFile)
3039   jint insert(const JavaVMInitArgs* args,
3040               const JavaVMInitArgs* args_to_insert,
3041               const int vm_options_file_pos) {
3042     assert(_args.options == nullptr, "shouldn't be set yet");
3043     assert(args_to_insert->nOptions != 0, "there should be args to insert");
3044     assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3045 
3046     int length = args->nOptions + args_to_insert->nOptions - 1;
3047     // Construct new option array
3048     GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3049     for (int i = 0; i < args->nOptions; i++) {
3050       if (i == vm_options_file_pos) {
3051         // insert the new options starting at the same place as the
3052         // -XX:VMOptionsFile option
3053         for (int j = 0; j < args_to_insert->nOptions; j++) {
3054           options.push(args_to_insert->options[j]);
3055         }
3056       } else {
3057         options.push(args->options[i]);
3058       }
3059     }
3060     // make into options array
3061     return set_args(&options);
3062   }
3063 };
3064 
3065 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3066   return parse_options_environment_variable("_JAVA_OPTIONS", args);
3067 }
3068 
3069 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3070   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3071 }
3072 
3073 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) {
3074   for (int index = args->nOptions - 1; index >= 0; index--) {
3075     JavaVMOption* option = args->options + index;
3076     if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) {
3077       return option;
3078     }
3079   }
3080 
3081   return nullptr;
3082 }
3083 
3084 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args,
3085                                                             ScopedVMInitArgs* jdk_aot_vm_options_args) {
3086   // Don't bother scanning all the args if this env variable is not set
3087   if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) {
3088     return JNI_OK;
3089   }
3090 
3091   // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value
3092   // of AOTMode.
3093   JavaVMOption* option = nullptr;
3094   for (int i = all_args->length() - 1; i >= 0; i--) {
3095     if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) {
3096       break;
3097     }
3098   }
3099 
3100   if (option != nullptr) {
3101     // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet,
3102     // so its value is not reflected inside the global variable AOTMode.
3103     if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) {
3104       return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3105     }
3106   } else {
3107     // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode,
3108     // which would have been set inside process_settings_file();
3109     if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) {
3110       return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS
3111     }
3112   }
3113 
3114   return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args);
3115 }
3116 
3117 jint Arguments::parse_options_environment_variable(const char* name,
3118                                                    ScopedVMInitArgs* vm_args) {
3119   char *buffer = ::getenv(name);
3120 
3121   // Don't check this environment variable if user has special privileges
3122   // (e.g. unix su command).
3123   if (buffer == nullptr || os::have_special_privileges()) {
3124     return JNI_OK;
3125   }
3126 
3127   if ((buffer = os::strdup(buffer)) == nullptr) {
3128     return JNI_ENOMEM;
3129   }
3130 
3131   jio_fprintf(defaultStream::error_stream(),
3132               "Picked up %s: %s\n", name, buffer);
3133 
3134   int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3135 
3136   os::free(buffer);
3137   return retcode;
3138 }
3139 
3140 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3141   // read file into buffer
3142   int fd = ::open(file_name, O_RDONLY);
3143   if (fd < 0) {
3144     jio_fprintf(defaultStream::error_stream(),
3145                 "Could not open options file '%s'\n",
3146                 file_name);
3147     return JNI_ERR;
3148   }
3149 
3150   struct stat stbuf;
3151   int retcode = os::stat(file_name, &stbuf);
3152   if (retcode != 0) {
3153     jio_fprintf(defaultStream::error_stream(),
3154                 "Could not stat options file '%s'\n",
3155                 file_name);
3156     ::close(fd);
3157     return JNI_ERR;
3158   }
3159 
3160   if (stbuf.st_size == 0) {
3161     // tell caller there is no option data and that is ok
3162     ::close(fd);
3163     return JNI_OK;
3164   }
3165 
3166   // '+ 1' for null termination even with max bytes
3167   size_t bytes_alloc = stbuf.st_size + 1;
3168 
3169   char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3170   if (nullptr == buf) {
3171     jio_fprintf(defaultStream::error_stream(),
3172                 "Could not allocate read buffer for options file parse\n");
3173     ::close(fd);
3174     return JNI_ENOMEM;
3175   }
3176 
3177   memset(buf, 0, bytes_alloc);
3178 
3179   // Fill buffer
3180   ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3181   ::close(fd);
3182   if (bytes_read < 0) {
3183     FREE_C_HEAP_ARRAY(char, buf);
3184     jio_fprintf(defaultStream::error_stream(),
3185                 "Could not read options file '%s'\n", file_name);
3186     return JNI_ERR;
3187   }
3188 
3189   if (bytes_read == 0) {
3190     // tell caller there is no option data and that is ok
3191     FREE_C_HEAP_ARRAY(char, buf);
3192     return JNI_OK;
3193   }
3194 
3195   retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3196 
3197   FREE_C_HEAP_ARRAY(char, buf);
3198   return retcode;
3199 }
3200 
3201 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3202   // Construct option array
3203   GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3204 
3205   // some pointers to help with parsing
3206   char *buffer_end = buffer + buf_len;
3207   char *opt_hd = buffer;
3208   char *wrt = buffer;
3209   char *rd = buffer;
3210 
3211   // parse all options
3212   while (rd < buffer_end) {
3213     // skip leading white space from the input string
3214     while (rd < buffer_end && isspace((unsigned char) *rd)) {
3215       rd++;
3216     }
3217 
3218     if (rd >= buffer_end) {
3219       break;
3220     }
3221 
3222     // Remember this is where we found the head of the token.
3223     opt_hd = wrt;
3224 
3225     // Tokens are strings of non white space characters separated
3226     // by one or more white spaces.
3227     while (rd < buffer_end && !isspace((unsigned char) *rd)) {
3228       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3229         int quote = *rd;                    // matching quote to look for
3230         rd++;                               // don't copy open quote
3231         while (rd < buffer_end && *rd != quote) {
3232                                             // include everything (even spaces)
3233                                             // up until the close quote
3234           *wrt++ = *rd++;                   // copy to option string
3235         }
3236 
3237         if (rd < buffer_end) {
3238           rd++;                             // don't copy close quote
3239         } else {
3240                                             // did not see closing quote
3241           jio_fprintf(defaultStream::error_stream(),
3242                       "Unmatched quote in %s\n", name);
3243           return JNI_ERR;
3244         }
3245       } else {
3246         *wrt++ = *rd++;                     // copy to option string
3247       }
3248     }
3249 
3250     // steal a white space character and set it to null
3251     *wrt++ = '\0';
3252     // We now have a complete token
3253 
3254     JavaVMOption option;
3255     option.optionString = opt_hd;
3256     option.extraInfo = nullptr;
3257 
3258     options.append(option);                // Fill in option
3259 
3260     rd++;  // Advance to next character
3261   }
3262 
3263   // Fill out JavaVMInitArgs structure.
3264   return vm_args->set_args(&options);
3265 }
3266 
3267 #ifndef PRODUCT
3268 // Determine whether LogVMOutput should be implicitly turned on.
3269 static bool use_vm_log() {
3270   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3271       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3272       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3273       PrintAssembly || TraceDeoptimization ||
3274       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3275     return true;
3276   }
3277 
3278 #ifdef COMPILER1
3279   if (PrintC1Statistics) {
3280     return true;
3281   }
3282 #endif // COMPILER1
3283 
3284 #ifdef COMPILER2
3285   if (PrintOptoAssembly || PrintOptoStatistics) {
3286     return true;
3287   }
3288 #endif // COMPILER2
3289 
3290   return false;
3291 }
3292 
3293 #endif // PRODUCT
3294 
3295 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3296   for (int index = 0; index < args->nOptions; index++) {
3297     const JavaVMOption* option = args->options + index;
3298     const char* tail;
3299     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3300       return true;
3301     }
3302   }
3303   return false;
3304 }
3305 
3306 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3307                                        const char* vm_options_file,
3308                                        const int vm_options_file_pos,
3309                                        ScopedVMInitArgs* vm_options_file_args,
3310                                        ScopedVMInitArgs* args_out) {
3311   jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3312   if (code != JNI_OK) {
3313     return code;
3314   }
3315 
3316   if (vm_options_file_args->get()->nOptions < 1) {
3317     return JNI_OK;
3318   }
3319 
3320   if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3321     jio_fprintf(defaultStream::error_stream(),
3322                 "A VM options file may not refer to a VM options file. "
3323                 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3324                 "options file '%s' in options container '%s' is an error.\n",
3325                 vm_options_file_args->vm_options_file_arg(),
3326                 vm_options_file_args->container_name());
3327     return JNI_EINVAL;
3328   }
3329 
3330   return args_out->insert(args, vm_options_file_args->get(),
3331                           vm_options_file_pos);
3332 }
3333 
3334 // Expand -XX:VMOptionsFile found in args_in as needed.
3335 // mod_args and args_out parameters may return values as needed.
3336 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3337                                             ScopedVMInitArgs* mod_args,
3338                                             JavaVMInitArgs** args_out) {
3339   jint code = match_special_option_and_act(args_in, mod_args);
3340   if (code != JNI_OK) {
3341     return code;
3342   }
3343 
3344   if (mod_args->is_set()) {
3345     // args_in contains -XX:VMOptionsFile and mod_args contains the
3346     // original options from args_in along with the options expanded
3347     // from the VMOptionsFile. Return a short-hand to the caller.
3348     *args_out = mod_args->get();
3349   } else {
3350     *args_out = (JavaVMInitArgs *)args_in;  // no changes so use args_in
3351   }
3352   return JNI_OK;
3353 }
3354 
3355 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3356                                              ScopedVMInitArgs* args_out) {
3357   // Remaining part of option string
3358   const char* tail;
3359   ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3360 
3361   for (int index = 0; index < args->nOptions; index++) {
3362     const JavaVMOption* option = args->options + index;
3363     if (match_option(option, "-XX:Flags=", &tail)) {
3364       Arguments::set_jvm_flags_file(tail);
3365       continue;
3366     }
3367     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3368       if (vm_options_file_args.found_vm_options_file_arg()) {
3369         jio_fprintf(defaultStream::error_stream(),
3370                     "The option '%s' is already specified in the options "
3371                     "container '%s' so the specification of '%s' in the "
3372                     "same options container is an error.\n",
3373                     vm_options_file_args.vm_options_file_arg(),
3374                     vm_options_file_args.container_name(),
3375                     option->optionString);
3376         return JNI_EINVAL;
3377       }
3378       vm_options_file_args.set_vm_options_file_arg(option->optionString);
3379       // If there's a VMOptionsFile, parse that
3380       jint code = insert_vm_options_file(args, tail, index,
3381                                          &vm_options_file_args, args_out);
3382       if (code != JNI_OK) {
3383         return code;
3384       }
3385       args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3386       if (args_out->is_set()) {
3387         // The VMOptions file inserted some options so switch 'args'
3388         // to the new set of options, and continue processing which
3389         // preserves "last option wins" semantics.
3390         args = args_out->get();
3391         // The first option from the VMOptionsFile replaces the
3392         // current option.  So we back track to process the
3393         // replacement option.
3394         index--;
3395       }
3396       continue;
3397     }
3398     if (match_option(option, "-XX:+PrintVMOptions")) {
3399       PrintVMOptions = true;
3400       continue;
3401     }
3402     if (match_option(option, "-XX:-PrintVMOptions")) {
3403       PrintVMOptions = false;
3404       continue;
3405     }
3406     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3407       IgnoreUnrecognizedVMOptions = true;
3408       continue;
3409     }
3410     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3411       IgnoreUnrecognizedVMOptions = false;
3412       continue;
3413     }
3414     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3415       JVMFlag::printFlags(tty, false);
3416       vm_exit(0);
3417     }
3418 
3419 #ifndef PRODUCT
3420     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3421       JVMFlag::printFlags(tty, true);
3422       vm_exit(0);
3423     }
3424 #endif
3425   }
3426   return JNI_OK;
3427 }
3428 
3429 static void print_options(const JavaVMInitArgs *args) {
3430   const char* tail;
3431   for (int index = 0; index < args->nOptions; index++) {
3432     const JavaVMOption *option = args->options + index;
3433     if (match_option(option, "-XX:", &tail)) {
3434       logOption(tail);
3435     }
3436   }
3437 }
3438 
3439 bool Arguments::handle_deprecated_print_gc_flags() {
3440   if (PrintGC) {
3441     log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3442   }
3443   if (PrintGCDetails) {
3444     log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3445   }
3446 
3447   if (_legacyGCLogging.lastFlag == 2) {
3448     // -Xloggc was used to specify a filename
3449     const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3450 
3451     LogTarget(Error, logging) target;
3452     LogStream errstream(target);
3453     return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3454   } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {
3455     LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3456   }
3457   return true;
3458 }
3459 
3460 static void apply_debugger_ergo() {
3461 #ifdef ASSERT
3462   if (ReplayCompiles) {
3463     FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3464   }
3465 
3466   if (UseDebuggerErgo) {
3467     // Turn on sub-flags
3468     FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3469     FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3470   }
3471 
3472   if (UseDebuggerErgo2) {
3473     // Debugging with limited number of CPUs
3474     FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3475     FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3476     FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3477     FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3478   }
3479 #endif // ASSERT
3480 }
3481 
3482 // Parse entry point called from JNI_CreateJavaVM
3483 
3484 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3485   assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3486   JVMFlag::check_all_flag_declarations();
3487 
3488   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3489   const char* hotspotrc = ".hotspotrc";
3490   bool settings_file_specified = false;
3491   bool needs_hotspotrc_warning = false;
3492   ScopedVMInitArgs initial_vm_options_args("");
3493   ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3494   ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3495   ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'");
3496 
3497   // Pointers to current working set of containers
3498   JavaVMInitArgs* cur_cmd_args;
3499   JavaVMInitArgs* cur_vm_options_args;
3500   JavaVMInitArgs* cur_java_options_args;
3501   JavaVMInitArgs* cur_java_tool_options_args;
3502   JavaVMInitArgs* cur_jdk_aot_vm_options_args;
3503 
3504   // Containers for modified/expanded options
3505   ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3506   ScopedVMInitArgs mod_vm_options_args("vm_options_args");
3507   ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3508   ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3509   ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'");
3510 
3511   GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args;
3512 
3513   jint code =
3514       parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3515   if (code != JNI_OK) {
3516     return code;
3517   }
3518 
3519   // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM.
3520   // This is an undocumented feature.
3521   code = parse_java_options_environment_variable(&initial_java_options_args);
3522   if (code != JNI_OK) {
3523     return code;
3524   }
3525 
3526   // Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3527   char *vmoptions = ClassLoader::lookup_vm_options();
3528   if (vmoptions != nullptr) {
3529     code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);
3530     FREE_C_HEAP_ARRAY(char, vmoptions);
3531     if (code != JNI_OK) {
3532       return code;
3533     }
3534   }
3535 
3536   code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3537                                      &mod_java_tool_options_args,
3538                                      &cur_java_tool_options_args);
3539   if (code != JNI_OK) {
3540     return code;
3541   }
3542 
3543   code = expand_vm_options_as_needed(initial_cmd_args,
3544                                      &mod_cmd_args,
3545                                      &cur_cmd_args);
3546   if (code != JNI_OK) {
3547     return code;
3548   }
3549 
3550   code = expand_vm_options_as_needed(initial_java_options_args.get(),
3551                                      &mod_java_options_args,
3552                                      &cur_java_options_args);
3553   if (code != JNI_OK) {
3554     return code;
3555   }
3556 
3557   code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3558                                      &mod_vm_options_args,
3559                                      &cur_vm_options_args);
3560   if (code != JNI_OK) {
3561     return code;
3562   }
3563 
3564   const char* flags_file = Arguments::get_jvm_flags_file();
3565   settings_file_specified = (flags_file != nullptr);
3566 
3567   // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags.
3568   if (settings_file_specified) {
3569     if (!process_settings_file(flags_file, true,
3570                                IgnoreUnrecognizedVMOptions)) {
3571       return JNI_EINVAL;
3572     }
3573   } else {
3574 #ifdef ASSERT
3575     // Parse default .hotspotrc settings file
3576     if (!process_settings_file(".hotspotrc", false,
3577                                IgnoreUnrecognizedVMOptions)) {
3578       return JNI_EINVAL;
3579     }
3580 #else
3581     struct stat buf;
3582     if (os::stat(hotspotrc, &buf) == 0) {
3583       needs_hotspotrc_warning = true;
3584     }
3585 #endif
3586   }
3587 
3588   // The settings in the args are applied in this order to the the JVM global flags.
3589   // For historical reasons, the order is DIFFERENT than the scanning order of
3590   // the above expand_vm_options_as_needed() calls.
3591   all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE});
3592   all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR});
3593   all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE});
3594   all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR});
3595 
3596   // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all
3597   // the options that have been gathered above.
3598   code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args);
3599   if (code != JNI_OK) {
3600     return code;
3601   }
3602   code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(),
3603                                      &mod_jdk_aot_vm_options_args,
3604                                      &cur_jdk_aot_vm_options_args);
3605   if (code != JNI_OK) {
3606     return code;
3607   }
3608 
3609   for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) {
3610     JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index;
3611     const char* optionString = option->optionString;
3612     if (strstr(optionString, "-XX:AOTMode=") == optionString &&
3613         strcmp(optionString, "-XX:AOTMode=create") != 0) {
3614       jio_fprintf(defaultStream::error_stream(),
3615                   "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString);
3616       return JNI_ERR;
3617     }
3618   }
3619 
3620   all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR});
3621 
3622   if (IgnoreUnrecognizedVMOptions) {
3623     // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of
3624     // the JDK so it shouldn't have bad options.
3625     cur_cmd_args->ignoreUnrecognized = true;
3626     cur_java_tool_options_args->ignoreUnrecognized = true;
3627     cur_java_options_args->ignoreUnrecognized = true;
3628     cur_jdk_aot_vm_options_args->ignoreUnrecognized = true;
3629   }
3630 
3631   if (PrintVMOptions) {
3632     // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed.
3633     print_options(cur_java_tool_options_args);
3634     print_options(cur_cmd_args);
3635     print_options(cur_java_options_args);
3636     print_options(cur_jdk_aot_vm_options_args);
3637   }
3638 
3639   // Apply the settings in these args to the JVM global flags.
3640   jint result = parse_vm_init_args(&all_args);
3641 
3642   if (result != JNI_OK) {
3643     return result;
3644   }
3645 
3646   // Delay warning until here so that we've had a chance to process
3647   // the -XX:-PrintWarnings flag
3648   if (needs_hotspotrc_warning) {
3649     warning("%s file is present but has been ignored.  "
3650             "Run with -XX:Flags=%s to load the file.",
3651             hotspotrc, hotspotrc);
3652   }
3653 
3654   if (needs_module_property_warning) {
3655     warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3656             " names that are reserved for internal use.");
3657   }
3658 
3659 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
3660   UNSUPPORTED_OPTION(UseLargePages);
3661 #endif
3662 
3663 #if defined(AIX)
3664   UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3665 #endif
3666 
3667 #ifndef PRODUCT
3668   if (TraceBytecodesAt != 0) {
3669     TraceBytecodes = true;
3670   }
3671 #endif // PRODUCT
3672 
3673   if (ScavengeRootsInCode == 0) {
3674     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3675       warning("Forcing ScavengeRootsInCode non-zero");
3676     }
3677     ScavengeRootsInCode = 1;
3678   }
3679 
3680   if (!handle_deprecated_print_gc_flags()) {
3681     return JNI_EINVAL;
3682   }
3683 
3684   // Set object alignment values.
3685   set_object_alignment();
3686 
3687 #if !INCLUDE_CDS
3688   if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {
3689     jio_fprintf(defaultStream::error_stream(),
3690       "Shared spaces are not supported in this VM\n");
3691     return JNI_ERR;
3692   }
3693   if (DumpLoadedClassList != nullptr) {
3694     jio_fprintf(defaultStream::error_stream(),
3695       "DumpLoadedClassList is not supported in this VM\n");
3696     return JNI_ERR;
3697   }
3698   if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3699       log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) {
3700     warning("Shared spaces are not supported in this VM");
3701     UseSharedSpaces = false;
3702     LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3703     LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot));
3704   }
3705   no_shared_spaces("CDS Disabled");
3706 #endif // INCLUDE_CDS
3707 
3708   // Verify NMT arguments
3709   const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3710   if (lvl == NMT_unknown) {
3711     jio_fprintf(defaultStream::error_stream(),
3712                 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3713     return JNI_ERR;
3714   }
3715   if (PrintNMTStatistics && lvl == NMT_off) {
3716     warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
3717     FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3718   }
3719 
3720   bool trace_dependencies = log_is_enabled(Debug, dependencies);
3721   if (trace_dependencies && VerifyDependencies) {
3722     warning("dependency logging results may be inflated by VerifyDependencies");
3723   }
3724 
3725   bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3726                               log_is_enabled(Info, class, load, cause);
3727   if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {
3728     warning("class load cause logging will not produce output without LogClassLoadingCauseFor");
3729   }
3730 
3731   apply_debugger_ergo();
3732 
3733   // The VMThread needs to stop now and then to execute these debug options.
3734   if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {
3735     FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3736   }
3737 
3738   if (log_is_enabled(Info, arguments)) {
3739     LogStream st(Log(arguments)::info());
3740     Arguments::print_on(&st);
3741   }
3742 
3743   return JNI_OK;
3744 }
3745 
3746 void Arguments::set_compact_headers_flags() {
3747 #ifdef _LP64
3748   if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) {
3749     warning("Compact object headers require compressed class pointers. Disabling compact object headers.");
3750     FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3751   }
3752   if (UseCompactObjectHeaders && !UseObjectMonitorTable) {
3753     // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable.
3754     if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) {
3755       FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3756 
3757       // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders.
3758     } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) {
3759       FLAG_SET_DEFAULT(UseCompactObjectHeaders, false);
3760       // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable.
3761     } else {
3762       FLAG_SET_DEFAULT(UseObjectMonitorTable, true);
3763     }
3764   }
3765   if (UseCompactObjectHeaders && !UseCompressedClassPointers) {
3766     FLAG_SET_DEFAULT(UseCompressedClassPointers, true);
3767   }
3768   if (UseCompactObjectHeaders && FLAG_IS_DEFAULT(hashCode)) {
3769     hashCode = 6;
3770   }
3771 #endif
3772 }
3773 
3774 jint Arguments::apply_ergo() {
3775   // Set flags based on ergonomics.
3776   jint result = set_ergonomics_flags();
3777   if (result != JNI_OK) return result;
3778 
3779   // Set heap size based on available physical memory
3780   set_heap_size();
3781 
3782   GCConfig::arguments()->initialize();
3783 
3784   set_compact_headers_flags();
3785 
3786   if (UseCompressedClassPointers) {
3787     CompressedKlassPointers::pre_initialize();
3788   }
3789 
3790   CDSConfig::ergo_initialize();
3791 
3792   // Initialize Metaspace flags and alignments
3793   Metaspace::ergo_initialize();
3794 
3795   if (!StringDedup::ergo_initialize()) {
3796     return JNI_EINVAL;
3797   }
3798 
3799   // Set compiler flags after GC is selected and GC specific
3800   // flags (LoopStripMiningIter) are set.
3801   CompilerConfig::ergo_initialize();
3802 
3803   // Set bytecode rewriting flags
3804   set_bytecode_flags();
3805 
3806   // Set flags if aggressive optimization flags are enabled
3807   jint code = set_aggressive_opts_flags();
3808   if (code != JNI_OK) {
3809     return code;
3810   }
3811 
3812   if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {
3813     FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3814   } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {
3815     warning("UseSecondarySupersTable is not supported");
3816     FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3817   }
3818   if (!UseSecondarySupersTable) {
3819     FLAG_SET_DEFAULT(StressSecondarySupers, false);
3820     FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3821   }
3822 
3823 #ifdef ZERO
3824   // Clear flags not supported on zero.
3825   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3826 #endif // ZERO
3827 
3828   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3829     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3830     DebugNonSafepoints = true;
3831   }
3832 
3833   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3834     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3835   }
3836 
3837   // Treat the odd case where local verification is enabled but remote
3838   // verification is not as if both were enabled.
3839   if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
3840     log_info(verification)("Turning on remote verification because local verification is on");
3841     FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3842   }
3843 
3844 #ifndef PRODUCT
3845   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3846     if (use_vm_log()) {
3847       LogVMOutput = true;
3848     }
3849   }
3850 #endif // PRODUCT
3851 
3852   if (PrintCommandLineFlags) {
3853     JVMFlag::printSetFlags(tty);
3854   }
3855 
3856 #if COMPILER2_OR_JVMCI
3857   if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {
3858     if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {
3859       warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");
3860     }
3861     FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3862 
3863     if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {
3864       if (!EnableVectorReboxing) {
3865         warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");
3866       } else {
3867         warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");
3868       }
3869     }
3870     FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3871   }
3872 #endif // COMPILER2_OR_JVMCI
3873 
3874 #ifdef COMPILER2
3875   if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) {
3876     warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off.");
3877     FLAG_SET_ERGO(UseProfiledLoopPredicate, false);
3878   }
3879 #endif // COMPILER2
3880 
3881   if (log_is_enabled(Info, perf, class, link)) {
3882     if (!UsePerfData) {
3883       warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");
3884       LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link));
3885       assert(!log_is_enabled(Info, perf, class, link), "sanity");
3886     }
3887   }
3888 
3889   if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {
3890     if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {
3891       LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3892     }
3893   }
3894   return JNI_OK;
3895 }
3896 
3897 jint Arguments::adjust_after_os() {
3898   if (UseNUMA) {
3899     if (UseParallelGC) {
3900       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3901          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3902       }
3903     }
3904   }
3905   return JNI_OK;
3906 }
3907 
3908 int Arguments::PropertyList_count(SystemProperty* pl) {
3909   int count = 0;
3910   while(pl != nullptr) {
3911     count++;
3912     pl = pl->next();
3913   }
3914   return count;
3915 }
3916 
3917 // Return the number of readable properties.
3918 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
3919   int count = 0;
3920   while(pl != nullptr) {
3921     if (pl->readable()) {
3922       count++;
3923     }
3924     pl = pl->next();
3925   }
3926   return count;
3927 }
3928 
3929 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3930   assert(key != nullptr, "just checking");
3931   SystemProperty* prop;
3932   for (prop = pl; prop != nullptr; prop = prop->next()) {
3933     if (strcmp(key, prop->key()) == 0) return prop->value();
3934   }
3935   return nullptr;
3936 }
3937 
3938 // Return the value of the requested property provided that it is a readable property.
3939 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
3940   assert(key != nullptr, "just checking");
3941   SystemProperty* prop;
3942   // Return the property value if the keys match and the property is not internal or
3943   // it's the special internal property "jdk.boot.class.path.append".
3944   for (prop = pl; prop != nullptr; prop = prop->next()) {
3945     if (strcmp(key, prop->key()) == 0) {
3946       if (!prop->internal()) {
3947         return prop->value();
3948       } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
3949         return prop->value();
3950       } else {
3951         // Property is internal and not jdk.boot.class.path.append so return null.
3952         return nullptr;
3953       }
3954     }
3955   }
3956   return nullptr;
3957 }
3958 
3959 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3960   SystemProperty* p = *plist;
3961   if (p == nullptr) {
3962     *plist = new_p;
3963   } else {
3964     while (p->next() != nullptr) {
3965       p = p->next();
3966     }
3967     p->set_next(new_p);
3968   }
3969 }
3970 
3971 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3972                                  bool writeable, bool internal) {
3973   if (plist == nullptr)
3974     return;
3975 
3976   SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3977   PropertyList_add(plist, new_p);
3978 }
3979 
3980 void Arguments::PropertyList_add(SystemProperty *element) {
3981   PropertyList_add(&_system_properties, element);
3982 }
3983 
3984 // This add maintains unique property key in the list.
3985 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3986                                         PropertyAppendable append, PropertyWriteable writeable,
3987                                         PropertyInternal internal) {
3988   if (plist == nullptr)
3989     return;
3990 
3991   // If property key exists and is writeable, then update with new value.
3992   // Trying to update a non-writeable property is silently ignored.
3993   SystemProperty* prop;
3994   for (prop = *plist; prop != nullptr; prop = prop->next()) {
3995     if (strcmp(k, prop->key()) == 0) {
3996       if (append == AppendProperty) {
3997         prop->append_writeable_value(v);
3998       } else {
3999         prop->set_writeable_value(v);
4000       }
4001       return;
4002     }
4003   }
4004 
4005   PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4006 }
4007 
4008 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4009 // Returns true if all of the source pointed by src has been copied over to
4010 // the destination buffer pointed by buf. Otherwise, returns false.
4011 // Notes:
4012 // 1. If the length (buflen) of the destination buffer excluding the
4013 // null terminator character is not long enough for holding the expanded
4014 // pid characters, it also returns false instead of returning the partially
4015 // expanded one.
4016 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4017 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4018                                 char* buf, size_t buflen) {
4019   const char* p = src;
4020   char* b = buf;
4021   const char* src_end = &src[srclen];
4022   char* buf_end = &buf[buflen - 1];
4023 
4024   while (p < src_end && b < buf_end) {
4025     if (*p == '%') {
4026       switch (*(++p)) {
4027       case '%':         // "%%" ==> "%"
4028         *b++ = *p++;
4029         break;
4030       case 'p':  {       //  "%p" ==> current process id
4031         // buf_end points to the character before the last character so
4032         // that we could write '\0' to the end of the buffer.
4033         size_t buf_sz = buf_end - b + 1;
4034         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4035 
4036         // if jio_snprintf fails or the buffer is not long enough to hold
4037         // the expanded pid, returns false.
4038         if (ret < 0 || ret >= (int)buf_sz) {
4039           return false;
4040         } else {
4041           b += ret;
4042           assert(*b == '\0', "fail in copy_expand_pid");
4043           if (p == src_end && b == buf_end + 1) {
4044             // reach the end of the buffer.
4045             return true;
4046           }
4047         }
4048         p++;
4049         break;
4050       }
4051       default :
4052         *b++ = '%';
4053       }
4054     } else {
4055       *b++ = *p++;
4056     }
4057   }
4058   *b = '\0';
4059   return (p == src_end); // return false if not all of the source was copied
4060 }