1 /*
   2  * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "jvm.h"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/javaAssertions.hpp"
  29 #include "classfile/moduleEntry.hpp"
  30 #include "classfile/stringTable.hpp"
  31 #include "classfile/symbolTable.hpp"
  32 #include "gc/shared/collectorPolicy.hpp"
  33 #include "gc/shared/gcArguments.hpp"
  34 #include "gc/shared/gcConfig.hpp"
  35 #include "logging/log.hpp"
  36 #include "logging/logConfiguration.hpp"
  37 #include "logging/logStream.hpp"
  38 #include "logging/logTag.hpp"
  39 #include "memory/allocation.inline.hpp"
  40 #include "memory/universe.hpp"
  41 #include "oops/oop.inline.hpp"
  42 #include "prims/jvmtiExport.hpp"
  43 #include "runtime/arguments.hpp"
  44 #include "runtime/arguments_ext.hpp"
  45 #include "runtime/flags/jvmFlag.hpp"
  46 #include "runtime/flags/jvmFlagConstraintList.hpp"
  47 #include "runtime/flags/jvmFlagWriteableList.hpp"
  48 #include "runtime/flags/jvmFlagRangeList.hpp"
  49 #include "runtime/globals_extension.hpp"
  50 #include "runtime/java.hpp"
  51 #include "runtime/os.inline.hpp"
  52 #include "runtime/safepoint.hpp"
  53 #include "runtime/safepointMechanism.hpp"
  54 #include "runtime/vm_version.hpp"
  55 #include "services/management.hpp"
  56 #include "services/memTracker.hpp"
  57 #include "utilities/align.hpp"
  58 #include "utilities/defaultStream.hpp"
  59 #include "utilities/macros.hpp"
  60 #include "utilities/stringUtils.hpp"
  61 #if INCLUDE_JVMCI
  62 #include "jvmci/jvmciRuntime.hpp"
  63 #endif
  64 #if INCLUDE_JFR
  65 #include "jfr/jfr.hpp"
  66 #endif
  67 
  68 // Note: This is a special bug reporting site for the JVM
  69 #ifdef VENDOR_URL_VM_BUG
  70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
  71 #else
  72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  73 #endif
  74 #define DEFAULT_JAVA_LAUNCHER  "generic"
  75 
  76 char*  Arguments::_jvm_flags_file               = NULL;
  77 char** Arguments::_jvm_flags_array              = NULL;
  78 int    Arguments::_num_jvm_flags                = 0;
  79 char** Arguments::_jvm_args_array               = NULL;
  80 int    Arguments::_num_jvm_args                 = 0;
  81 char*  Arguments::_java_command                 = NULL;
  82 SystemProperty* Arguments::_system_properties   = NULL;
  83 const char*  Arguments::_gc_log_filename        = NULL;
  84 size_t Arguments::_conservative_max_heap_alignment = 0;
  85 size_t Arguments::_min_heap_size                = 0;
  86 Arguments::Mode Arguments::_mode                = _mixed;
  87 bool   Arguments::_java_compiler                = false;
  88 bool   Arguments::_xdebug_mode                  = false;
  89 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  90 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  91 int    Arguments::_sun_java_launcher_pid        = -1;
  92 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
  93 
  94 // These parameters are reset in method parse_vm_init_args()
  95 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  96 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  97 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  98 bool   Arguments::_ClipInlining                 = ClipInlining;
  99 intx   Arguments::_Tier3InvokeNotifyFreqLog     = Tier3InvokeNotifyFreqLog;
 100 intx   Arguments::_Tier4InvocationThreshold     = Tier4InvocationThreshold;
 101 
 102 bool   Arguments::_enable_preview               = false;
 103 
 104 char*  Arguments::SharedArchivePath             = NULL;
 105 
 106 AgentLibraryList Arguments::_libraryList;
 107 AgentLibraryList Arguments::_agentList;
 108 
 109 abort_hook_t     Arguments::_abort_hook         = NULL;
 110 exit_hook_t      Arguments::_exit_hook          = NULL;
 111 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 112 
 113 
 114 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 115 SystemProperty *Arguments::_java_library_path = NULL;
 116 SystemProperty *Arguments::_java_home = NULL;
 117 SystemProperty *Arguments::_java_class_path = NULL;
 118 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
 119 
 120 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
 121 PathString *Arguments::_system_boot_class_path = NULL;
 122 bool Arguments::_has_jimage = false;
 123 
 124 char* Arguments::_ext_dirs = NULL;
 125 
 126 bool PathString::set_value(const char *value) {
 127   if (_value != NULL) {
 128     FreeHeap(_value);
 129   }
 130   _value = AllocateHeap(strlen(value)+1, mtArguments);
 131   assert(_value != NULL, "Unable to allocate space for new path value");
 132   if (_value != NULL) {
 133     strcpy(_value, value);
 134   } else {
 135     // not able to allocate
 136     return false;
 137   }
 138   return true;
 139 }
 140 
 141 void PathString::append_value(const char *value) {
 142   char *sp;
 143   size_t len = 0;
 144   if (value != NULL) {
 145     len = strlen(value);
 146     if (_value != NULL) {
 147       len += strlen(_value);
 148     }
 149     sp = AllocateHeap(len+2, mtArguments);
 150     assert(sp != NULL, "Unable to allocate space for new append path value");
 151     if (sp != NULL) {
 152       if (_value != NULL) {
 153         strcpy(sp, _value);
 154         strcat(sp, os::path_separator());
 155         strcat(sp, value);
 156         FreeHeap(_value);
 157       } else {
 158         strcpy(sp, value);
 159       }
 160       _value = sp;
 161     }
 162   }
 163 }
 164 
 165 PathString::PathString(const char* value) {
 166   if (value == NULL) {
 167     _value = NULL;
 168   } else {
 169     _value = AllocateHeap(strlen(value)+1, mtArguments);
 170     strcpy(_value, value);
 171   }
 172 }
 173 
 174 PathString::~PathString() {
 175   if (_value != NULL) {
 176     FreeHeap(_value);
 177     _value = NULL;
 178   }
 179 }
 180 
 181 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
 182   assert(module_name != NULL && path != NULL, "Invalid module name or path value");
 183   size_t len = strlen(module_name) + 1;
 184   _module_name = AllocateHeap(len, mtInternal);
 185   strncpy(_module_name, module_name, len); // copy the trailing null
 186   _path =  new PathString(path);
 187 }
 188 
 189 ModulePatchPath::~ModulePatchPath() {
 190   if (_module_name != NULL) {
 191     FreeHeap(_module_name);
 192     _module_name = NULL;
 193   }
 194   if (_path != NULL) {
 195     delete _path;
 196     _path = NULL;
 197   }
 198 }
 199 
 200 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
 201   if (key == NULL) {
 202     _key = NULL;
 203   } else {
 204     _key = AllocateHeap(strlen(key)+1, mtArguments);
 205     strcpy(_key, key);
 206   }
 207   _next = NULL;
 208   _internal = internal;
 209   _writeable = writeable;
 210 }
 211 
 212 AgentLibrary::AgentLibrary(const char* name, const char* options,
 213                bool is_absolute_path, void* os_lib,
 214                bool instrument_lib) {
 215   _name = AllocateHeap(strlen(name)+1, mtArguments);
 216   strcpy(_name, name);
 217   if (options == NULL) {
 218     _options = NULL;
 219   } else {
 220     _options = AllocateHeap(strlen(options)+1, mtArguments);
 221     strcpy(_options, options);
 222   }
 223   _is_absolute_path = is_absolute_path;
 224   _os_lib = os_lib;
 225   _next = NULL;
 226   _state = agent_invalid;
 227   _is_static_lib = false;
 228   _is_instrument_lib = instrument_lib;
 229 }
 230 
 231 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 232 // part of the option string.
 233 static bool match_option(const JavaVMOption *option, const char* name,
 234                          const char** tail) {
 235   size_t len = strlen(name);
 236   if (strncmp(option->optionString, name, len) == 0) {
 237     *tail = option->optionString + len;
 238     return true;
 239   } else {
 240     return false;
 241   }
 242 }
 243 
 244 // Check if 'option' matches 'name'. No "tail" is allowed.
 245 static bool match_option(const JavaVMOption *option, const char* name) {
 246   const char* tail = NULL;
 247   bool result = match_option(option, name, &tail);
 248   if (tail != NULL && *tail == '\0') {
 249     return result;
 250   } else {
 251     return false;
 252   }
 253 }
 254 
 255 // Return true if any of the strings in null-terminated array 'names' matches.
 256 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 257 // the option must match exactly.
 258 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 259   bool tail_allowed) {
 260   for (/* empty */; *names != NULL; ++names) {
 261   if (match_option(option, *names, tail)) {
 262       if (**tail == '\0' || (tail_allowed && **tail == ':')) {
 263         return true;
 264       }
 265     }
 266   }
 267   return false;
 268 }
 269 
 270 #if INCLUDE_JFR
 271 // return true on failure
 272 static bool match_jfr_option(const JavaVMOption** option) {
 273   assert((*option)->optionString != NULL, "invariant");
 274   char* tail = NULL;
 275   if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
 276     return Jfr::on_start_flight_recording_option(option, tail);
 277   } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
 278     return Jfr::on_flight_recorder_option(option, tail);
 279   }
 280   return false;
 281 }
 282 #endif
 283 
 284 static void logOption(const char* opt) {
 285   if (PrintVMOptions) {
 286     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 287   }
 288 }
 289 
 290 bool needs_module_property_warning = false;
 291 
 292 #define MODULE_PROPERTY_PREFIX "jdk.module."
 293 #define MODULE_PROPERTY_PREFIX_LEN 11
 294 #define ADDEXPORTS "addexports"
 295 #define ADDEXPORTS_LEN 10
 296 #define ADDREADS "addreads"
 297 #define ADDREADS_LEN 8
 298 #define ADDOPENS "addopens"
 299 #define ADDOPENS_LEN 8
 300 #define PATCH "patch"
 301 #define PATCH_LEN 5
 302 #define ADDMODS "addmods"
 303 #define ADDMODS_LEN 7
 304 #define LIMITMODS "limitmods"
 305 #define LIMITMODS_LEN 9
 306 #define PATH "path"
 307 #define PATH_LEN 4
 308 #define UPGRADE_PATH "upgrade.path"
 309 #define UPGRADE_PATH_LEN 12
 310 
 311 void Arguments::add_init_library(const char* name, char* options) {
 312   _libraryList.add(new AgentLibrary(name, options, false, NULL));
 313 }
 314 
 315 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
 316   _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
 317 }
 318 
 319 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
 320   _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
 321 }
 322 
 323 // Late-binding agents not started via arguments
 324 void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
 325   _agentList.add(agentLib);
 326 }
 327 
 328 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) {
 329   _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib));
 330 }
 331 
 332 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
 333 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
 334   return ((strncmp(option, property, len) == 0) &&
 335           (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
 336 }
 337 
 338 // Return true if property starts with "jdk.module." and its ensuing chars match
 339 // any of the reserved module properties.
 340 // property should be passed without the leading "-D".
 341 bool Arguments::is_internal_module_property(const char* property) {
 342   assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
 343   if  (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
 344     const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
 345     if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
 346         matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
 347         matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
 348         matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
 349         matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
 350         matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
 351         matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
 352         matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
 353       return true;
 354     }
 355   }
 356   return false;
 357 }
 358 
 359 // Process java launcher properties.
 360 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 361   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 362   // sun.java.launcher.pid is defined.
 363   // Must do this before setting up other system properties,
 364   // as some of them may depend on launcher type.
 365   for (int index = 0; index < args->nOptions; index++) {
 366     const JavaVMOption* option = args->options + index;
 367     const char* tail;
 368 
 369     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 370       process_java_launcher_argument(tail, option->extraInfo);
 371       continue;
 372     }
 373     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 374       if (strcmp(tail, "true") == 0) {
 375         _sun_java_launcher_is_altjvm = true;
 376       }
 377       continue;
 378     }
 379     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 380       _sun_java_launcher_pid = atoi(tail);
 381       continue;
 382     }
 383   }
 384 }
 385 
 386 // Initialize system properties key and value.
 387 void Arguments::init_system_properties() {
 388 
 389   // Set up _system_boot_class_path which is not a property but
 390   // relies heavily on argument processing and the jdk.boot.class.path.append
 391   // property. It is used to store the underlying system boot class path.
 392   _system_boot_class_path = new PathString(NULL);
 393 
 394   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 395                                                            "Java Virtual Machine Specification",  false));
 396   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 397   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 398   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 399   PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(),  false));
 400 
 401   // Following are JVMTI agent writable properties.
 402   // Properties values are set to NULL and they are
 403   // os specific they are initialized in os::init_system_properties_values().
 404   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 405   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 406   _java_home =  new SystemProperty("java.home", NULL,  true);
 407   _java_class_path = new SystemProperty("java.class.path", "",  true);
 408   // jdk.boot.class.path.append is a non-writeable, internal property.
 409   // It can only be set by either:
 410   //    - -Xbootclasspath/a:
 411   //    - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
 412   _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
 413 
 414   // Add to System Property list.
 415   PropertyList_add(&_system_properties, _sun_boot_library_path);
 416   PropertyList_add(&_system_properties, _java_library_path);
 417   PropertyList_add(&_system_properties, _java_home);
 418   PropertyList_add(&_system_properties, _java_class_path);
 419   PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
 420 
 421   // Set OS specific system properties values
 422   os::init_system_properties_values();
 423 }
 424 
 425 // Update/Initialize System properties after JDK version number is known
 426 void Arguments::init_version_specific_system_properties() {
 427   enum { bufsz = 16 };
 428   char buffer[bufsz];
 429   const char* spec_vendor = "Oracle Corporation";
 430   uint32_t spec_version = JDK_Version::current().major_version();
 431 
 432   jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
 433 
 434   PropertyList_add(&_system_properties,
 435       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 436   PropertyList_add(&_system_properties,
 437       new SystemProperty("java.vm.specification.version", buffer, false));
 438   PropertyList_add(&_system_properties,
 439       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 440 }
 441 
 442 /*
 443  *  -XX argument processing:
 444  *
 445  *  -XX arguments are defined in several places, such as:
 446  *      globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
 447  *  -XX arguments are parsed in parse_argument().
 448  *  -XX argument bounds checking is done in check_vm_args_consistency().
 449  *
 450  * Over time -XX arguments may change. There are mechanisms to handle common cases:
 451  *
 452  *      ALIASED: An option that is simply another name for another option. This is often
 453  *               part of the process of deprecating a flag, but not all aliases need
 454  *               to be deprecated.
 455  *
 456  *               Create an alias for an option by adding the old and new option names to the
 457  *               "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
 458  *
 459  *   DEPRECATED: An option that is supported, but a warning is printed to let the user know that
 460  *               support may be removed in the future. Both regular and aliased options may be
 461  *               deprecated.
 462  *
 463  *               Add a deprecation warning for an option (or alias) by adding an entry in the
 464  *               "special_jvm_flags" table and setting the "deprecated_in" field.
 465  *               Often an option "deprecated" in one major release will
 466  *               be made "obsolete" in the next. In this case the entry should also have its
 467  *               "obsolete_in" field set.
 468  *
 469  *     OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
 470  *               on the command line. A warning is printed to let the user know that option might not
 471  *               be accepted in the future.
 472  *
 473  *               Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
 474  *               table and setting the "obsolete_in" field.
 475  *
 476  *      EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
 477  *               to the current JDK version. The system will flatly refuse to admit the existence of
 478  *               the flag. This allows a flag to die automatically over JDK releases.
 479  *
 480  *               Note that manual cleanup of expired options should be done at major JDK version upgrades:
 481  *                  - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
 482  *                  - Newly obsolete or expired deprecated options should have their global variable
 483  *                    definitions removed (from globals.hpp, etc) and related implementations removed.
 484  *
 485  * Recommended approach for removing options:
 486  *
 487  * To remove options commonly used by customers (e.g. product, commercial -XX options), use
 488  * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
 489  *
 490  * To remove internal options (e.g. diagnostic, experimental, develop options), use
 491  * a 2-step model adding major release numbers to the obsolete and expire columns.
 492  *
 493  * To change the name of an option, use the alias table as well as a 2-step
 494  * model adding major release numbers to the deprecate and expire columns.
 495  * Think twice about aliasing commonly used customer options.
 496  *
 497  * There are times when it is appropriate to leave a future release number as undefined.
 498  *
 499  * Tests:  Aliases should be tested in VMAliasOptions.java.
 500  *         Deprecated options should be tested in VMDeprecatedOptions.java.
 501  */
 502 
 503 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
 504 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
 505 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
 506 // the command-line as usual, but will issue a warning.
 507 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
 508 // the command-line, while issuing a warning and ignoring the flag value.
 509 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
 510 // existence of the flag.
 511 //
 512 // MANUAL CLEANUP ON JDK VERSION UPDATES:
 513 // This table ensures that the handling of options will update automatically when the JDK
 514 // version is incremented, but the source code needs to be cleanup up manually:
 515 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
 516 //   variable should be removed, as well as users of the variable.
 517 // - As "deprecated" options age into "obsolete" options, move the entry into the
 518 //   "Obsolete Flags" section of the table.
 519 // - All expired options should be removed from the table.
 520 static SpecialFlag const special_jvm_flags[] = {
 521   // -------------- Deprecated Flags --------------
 522   // --- Non-alias flags - sorted by obsolete_in then expired_in:
 523   { "MaxGCMinorPauseMillis",        JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
 524   { "UseConcMarkSweepGC",           JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 525   { "AssumeMP",                     JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
 526   { "MonitorInUseLists",            JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
 527   { "MaxRAMFraction",               JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
 528   { "MinRAMFraction",               JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
 529   { "InitialRAMFraction",           JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
 530   { "UseMembar",                    JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
 531   { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10),  JDK_Version::undefined(), JDK_Version::undefined() },
 532   { "CompilerThreadHintNoPreempt",  JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
 533   { "VMThreadHintNoPreempt",        JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
 534   { "PrintSafepointStatistics",     JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
 535   { "PrintSafepointStatisticsTimeout", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
 536   { "PrintSafepointStatisticsCount",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
 537   { "AggressiveOpts",               JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
 538   { "AllowNonVirtualCalls",         JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) },
 539 
 540   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
 541   { "DefaultMaxRAMFraction",        JDK_Version::jdk(8),  JDK_Version::undefined(), JDK_Version::undefined() },
 542   { "CreateMinidumpOnCrash",        JDK_Version::jdk(9),  JDK_Version::undefined(), JDK_Version::undefined() },
 543   { "MustCallLoadClassInternal",    JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 544   { "UnsyncloadClass",              JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 545 
 546   // -------------- Obsolete Flags - sorted by expired_in --------------
 547   { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 548   { "PrintMallocFree",               JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 549   { "PrintMalloc",                   JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 550   { "ShowSafepointMsgs",             JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 551   { "FastTLABRefill",                JDK_Version::jdk(10),     JDK_Version::jdk(11), JDK_Version::jdk(12) },
 552   { "SafepointSpinBeforeYield",      JDK_Version::jdk(10),     JDK_Version::jdk(11), JDK_Version::jdk(12) },
 553   { "CheckEndorsedAndExtDirs",       JDK_Version::jdk(10),     JDK_Version::jdk(11), JDK_Version::jdk(12) },
 554   { "DeferThrSuspendLoopCount",      JDK_Version::jdk(10),     JDK_Version::jdk(11), JDK_Version::jdk(12) },
 555   { "DeferPollingPageLoopCount",     JDK_Version::jdk(10),     JDK_Version::jdk(11), JDK_Version::jdk(12) },
 556   { "TraceScavenge",                 JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 557   { "PermSize",                      JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
 558   { "MaxPermSize",                   JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
 559   { "SharedReadWriteSize",           JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
 560   { "SharedReadOnlySize",            JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
 561   { "SharedMiscDataSize",            JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
 562   { "SharedMiscCodeSize",            JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
 563   { "UseUTCFileTimestamp",           JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 564   { "UseAppCDS",                     JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 565   { "InlineNotify",                  JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 566   { "EnableTracing",                 JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 567   { "UseLockedTracing",              JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) },
 568 
 569 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
 570   { "dep > obs",                    JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
 571   { "dep > exp ",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
 572   { "obs > exp ",                   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
 573   { "not deprecated or obsolete",   JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
 574   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 575   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 576   { "BytecodeVerificationRemote",   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
 577 #endif
 578 
 579   { NULL, JDK_Version(0), JDK_Version(0) }
 580 };
 581 
 582 // Flags that are aliases for other flags.
 583 typedef struct {
 584   const char* alias_name;
 585   const char* real_name;
 586 } AliasedFlag;
 587 
 588 static AliasedFlag const aliased_jvm_flags[] = {
 589   { "DefaultMaxRAMFraction",    "MaxRAMFraction"    },
 590   { "CreateMinidumpOnCrash",    "CreateCoredumpOnCrash" },
 591   { NULL, NULL}
 592 };
 593 
 594 // NOTE: A compatibility request will be necessary for each alias to be removed.
 595 static AliasedLoggingFlag const aliased_logging_flags[] = {
 596   { "PrintCompressedOopsMode",   LogLevel::Info,  true,  LOG_TAGS(gc, heap, coops) },
 597   { "PrintSharedSpaces",         LogLevel::Info,  true,  LOG_TAGS(cds) },
 598   { "TraceBiasedLocking",        LogLevel::Info,  true,  LOG_TAGS(biasedlocking) },
 599   { "TraceClassLoading",         LogLevel::Info,  true,  LOG_TAGS(class, load) },
 600   { "TraceClassLoadingPreorder", LogLevel::Debug, true,  LOG_TAGS(class, preorder) },
 601   { "TraceClassPaths",           LogLevel::Info,  true,  LOG_TAGS(class, path) },
 602   { "TraceClassResolution",      LogLevel::Debug, true,  LOG_TAGS(class, resolve) },
 603   { "TraceClassUnloading",       LogLevel::Info,  true,  LOG_TAGS(class, unload) },
 604   { "TraceExceptions",           LogLevel::Info,  true,  LOG_TAGS(exceptions) },
 605   { "TraceLoaderConstraints",    LogLevel::Info,  true,  LOG_TAGS(class, loader, constraints) },
 606   { "TraceMonitorInflation",     LogLevel::Debug, true,  LOG_TAGS(monitorinflation) },
 607   { "TraceSafepointCleanupTime", LogLevel::Info,  true,  LOG_TAGS(safepoint, cleanup) },
 608   { "TraceJVMTIObjectTagging",   LogLevel::Debug, true,  LOG_TAGS(jvmti, objecttagging) },
 609   { "TraceRedefineClasses",      LogLevel::Info,  false, LOG_TAGS(redefine, class) },
 610   { NULL,                        LogLevel::Off,   false, LOG_TAGS(_NO_TAG) }
 611 };
 612 
 613 #ifndef PRODUCT
 614 // These options are removed in jdk9. Remove this code for jdk10.
 615 static AliasedFlag const removed_develop_logging_flags[] = {
 616   { "TraceClassInitialization",   "-Xlog:class+init" },
 617   { "TraceClassLoaderData",       "-Xlog:class+loader+data" },
 618   { "TraceDefaultMethods",        "-Xlog:defaultmethods=debug" },
 619   { "TraceItables",               "-Xlog:itables=debug" },
 620   { "TraceMonitorMismatch",       "-Xlog:monitormismatch=info" },
 621   { "TraceSafepoint",             "-Xlog:safepoint=debug" },
 622   { "TraceStartupTime",           "-Xlog:startuptime" },
 623   { "TraceVMOperation",           "-Xlog:vmoperation=debug" },
 624   { "PrintVtables",               "-Xlog:vtables=debug" },
 625   { "VerboseVerification",        "-Xlog:verification" },
 626   { NULL, NULL }
 627 };
 628 #endif //PRODUCT
 629 
 630 // Return true if "v" is less than "other", where "other" may be "undefined".
 631 static bool version_less_than(JDK_Version v, JDK_Version other) {
 632   assert(!v.is_undefined(), "must be defined");
 633   if (!other.is_undefined() && v.compare(other) >= 0) {
 634     return false;
 635   } else {
 636     return true;
 637   }
 638 }
 639 
 640 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
 641 
 642 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
 643   // Allow extensions to have priority
 644   if (lookup_special_flag_ext(flag_name, flag)) {
 645     return true;
 646   }
 647 
 648   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 649     if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 650       flag = special_jvm_flags[i];
 651       return true;
 652     }
 653   }
 654   return false;
 655 }
 656 
 657 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
 658   assert(version != NULL, "Must provide a version buffer");
 659   SpecialFlag flag;
 660   if (lookup_special_flag(flag_name, flag)) {
 661     if (!flag.obsolete_in.is_undefined()) {
 662       if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 663         *version = flag.obsolete_in;
 664         return true;
 665       }
 666     }
 667   }
 668   return false;
 669 }
 670 
 671 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
 672   assert(version != NULL, "Must provide a version buffer");
 673   SpecialFlag flag;
 674   if (lookup_special_flag(flag_name, flag)) {
 675     if (!flag.deprecated_in.is_undefined()) {
 676       if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
 677           version_less_than(JDK_Version::current(), flag.expired_in)) {
 678         *version = flag.deprecated_in;
 679         return 1;
 680       } else {
 681         return -1;
 682       }
 683     }
 684   }
 685   return 0;
 686 }
 687 
 688 #ifndef PRODUCT
 689 const char* Arguments::removed_develop_logging_flag_name(const char* name){
 690   for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
 691     const AliasedFlag& flag = removed_develop_logging_flags[i];
 692     if (strcmp(flag.alias_name, name) == 0) {
 693       return flag.real_name;
 694     }
 695   }
 696   return NULL;
 697 }
 698 #endif // PRODUCT
 699 
 700 const char* Arguments::real_flag_name(const char *flag_name) {
 701   for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
 702     const AliasedFlag& flag_status = aliased_jvm_flags[i];
 703     if (strcmp(flag_status.alias_name, flag_name) == 0) {
 704         return flag_status.real_name;
 705     }
 706   }
 707   return flag_name;
 708 }
 709 
 710 #ifdef ASSERT
 711 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
 712   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 713     if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 714       return true;
 715     }
 716   }
 717   return false;
 718 }
 719 
 720 // Verifies the correctness of the entries in the special_jvm_flags table.
 721 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion
 722 // version being earlier than the deprecation version, then a warning is issued
 723 // and verification fails - by returning false. If it is detected that the table
 724 // is out of date, with respect to the current version, then a warning is issued
 725 // but verification does not fail. This allows the VM to operate when the version
 726 // is first updated, without needing to update all the impacted flags at the
 727 // same time.
 728 static bool verify_special_jvm_flags() {
 729   bool success = true;
 730   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 731     const SpecialFlag& flag = special_jvm_flags[i];
 732     if (lookup_special_flag(flag.name, i)) {
 733       warning("Duplicate special flag declaration \"%s\"", flag.name);
 734       success = false;
 735     }
 736     if (flag.deprecated_in.is_undefined() &&
 737         flag.obsolete_in.is_undefined()) {
 738       warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
 739       success = false;
 740     }
 741 
 742     if (!flag.deprecated_in.is_undefined()) {
 743       if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
 744         warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
 745         success = false;
 746       }
 747 
 748       if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
 749         warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
 750         success = false;
 751       }
 752     }
 753 
 754     if (!flag.obsolete_in.is_undefined()) {
 755       if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
 756         warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
 757         success = false;
 758       }
 759 
 760       // if flag has become obsolete it should not have a "globals" flag defined anymore.
 761       if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 762         if (JVMFlag::find_flag(flag.name) != NULL) {
 763           // Temporarily disable the warning: 8196739
 764           // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
 765         }
 766       }
 767     }
 768 
 769     if (!flag.expired_in.is_undefined()) {
 770       // if flag has become expired it should not have a "globals" flag defined anymore.
 771       if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
 772         if (JVMFlag::find_flag(flag.name) != NULL) {
 773           // Temporarily disable the warning: 8196739
 774           // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
 775         }
 776       }
 777     }
 778 
 779   }
 780   return success;
 781 }
 782 #endif
 783 
 784 // Parses a size specification string.
 785 bool Arguments::atojulong(const char *s, julong* result) {
 786   julong n = 0;
 787 
 788   // First char must be a digit. Don't allow negative numbers or leading spaces.
 789   if (!isdigit(*s)) {
 790     return false;
 791   }
 792 
 793   bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
 794   char* remainder;
 795   errno = 0;
 796   n = strtoull(s, &remainder, (is_hex ? 16 : 10));
 797   if (errno != 0) {
 798     return false;
 799   }
 800 
 801   // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
 802   if (remainder == s || strlen(remainder) > 1) {
 803     return false;
 804   }
 805 
 806   switch (*remainder) {
 807     case 'T': case 't':
 808       *result = n * G * K;
 809       // Check for overflow.
 810       if (*result/((julong)G * K) != n) return false;
 811       return true;
 812     case 'G': case 'g':
 813       *result = n * G;
 814       if (*result/G != n) return false;
 815       return true;
 816     case 'M': case 'm':
 817       *result = n * M;
 818       if (*result/M != n) return false;
 819       return true;
 820     case 'K': case 'k':
 821       *result = n * K;
 822       if (*result/K != n) return false;
 823       return true;
 824     case '\0':
 825       *result = n;
 826       return true;
 827     default:
 828       return false;
 829   }
 830 }
 831 
 832 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
 833   if (size < min_size) return arg_too_small;
 834   if (size > max_size) return arg_too_big;
 835   return arg_in_range;
 836 }
 837 
 838 // Describe an argument out of range error
 839 void Arguments::describe_range_error(ArgsRange errcode) {
 840   switch(errcode) {
 841   case arg_too_big:
 842     jio_fprintf(defaultStream::error_stream(),
 843                 "The specified size exceeds the maximum "
 844                 "representable size.\n");
 845     break;
 846   case arg_too_small:
 847   case arg_unreadable:
 848   case arg_in_range:
 849     // do nothing for now
 850     break;
 851   default:
 852     ShouldNotReachHere();
 853   }
 854 }
 855 
 856 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
 857   if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
 858     return true;
 859   } else {
 860     return false;
 861   }
 862 }
 863 
 864 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
 865   char* end;
 866   errno = 0;
 867   double v = strtod(value, &end);
 868   if ((errno != 0) || (*end != 0)) {
 869     return false;
 870   }
 871 
 872   if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
 873     return true;
 874   }
 875   return false;
 876 }
 877 
 878 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
 879   julong v;
 880   int int_v;
 881   intx intx_v;
 882   bool is_neg = false;
 883   JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
 884 
 885   if (result == NULL) {
 886     return false;
 887   }
 888 
 889   // Check the sign first since atojulong() parses only unsigned values.
 890   if (*value == '-') {
 891     if (!result->is_intx() && !result->is_int()) {
 892       return false;
 893     }
 894     value++;
 895     is_neg = true;
 896   }
 897   if (!Arguments::atojulong(value, &v)) {
 898     return false;
 899   }
 900   if (result->is_int()) {
 901     int_v = (int) v;
 902     if (is_neg) {
 903       int_v = -int_v;
 904     }
 905     return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
 906   } else if (result->is_uint()) {
 907     uint uint_v = (uint) v;
 908     return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
 909   } else if (result->is_intx()) {
 910     intx_v = (intx) v;
 911     if (is_neg) {
 912       intx_v = -intx_v;
 913     }
 914     return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
 915   } else if (result->is_uintx()) {
 916     uintx uintx_v = (uintx) v;
 917     return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
 918   } else if (result->is_uint64_t()) {
 919     uint64_t uint64_t_v = (uint64_t) v;
 920     return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
 921   } else if (result->is_size_t()) {
 922     size_t size_t_v = (size_t) v;
 923     return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
 924   } else if (result->is_double()) {
 925     double double_v = (double) v;
 926     return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
 927   } else {
 928     return false;
 929   }
 930 }
 931 
 932 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
 933   if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
 934   // Contract:  JVMFlag always returns a pointer that needs freeing.
 935   FREE_C_HEAP_ARRAY(char, value);
 936   return true;
 937 }
 938 
 939 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
 940   const char* old_value = "";
 941   if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
 942   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 943   size_t new_len = strlen(new_value);
 944   const char* value;
 945   char* free_this_too = NULL;
 946   if (old_len == 0) {
 947     value = new_value;
 948   } else if (new_len == 0) {
 949     value = old_value;
 950   } else {
 951      size_t length = old_len + 1 + new_len + 1;
 952      char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
 953     // each new setting adds another LINE to the switch:
 954     jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
 955     value = buf;
 956     free_this_too = buf;
 957   }
 958   (void) JVMFlag::ccstrAtPut(name, &value, origin);
 959   // JVMFlag always returns a pointer that needs freeing.
 960   FREE_C_HEAP_ARRAY(char, value);
 961   if (free_this_too != NULL) {
 962     // JVMFlag made its own copy, so I must delete my own temp. buffer.
 963     FREE_C_HEAP_ARRAY(char, free_this_too);
 964   }
 965   return true;
 966 }
 967 
 968 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
 969   const char* real_name = real_flag_name(arg);
 970   JDK_Version since = JDK_Version();
 971   switch (is_deprecated_flag(arg, &since)) {
 972     case -1:
 973       return NULL; // obsolete or expired, don't process normally
 974     case 0:
 975       return real_name;
 976     case 1: {
 977       if (warn) {
 978         char version[256];
 979         since.to_string(version, sizeof(version));
 980         if (real_name != arg) {
 981           warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
 982                   arg, version, real_name);
 983         } else {
 984           warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
 985                   arg, version);
 986         }
 987       }
 988       return real_name;
 989     }
 990   }
 991   ShouldNotReachHere();
 992   return NULL;
 993 }
 994 
 995 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
 996   LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
 997   // Set tagset string buffer at max size of 256, large enough for any alias tagset
 998   const int max_tagset_size = 256;
 999   int max_tagset_len = max_tagset_size - 1;
1000   char tagset_buffer[max_tagset_size];
1001   tagset_buffer[0] = '\0';
1002 
1003   // Write tag-set for aliased logging option, in string list form
1004   int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1005   for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1006     if (i > 0) {
1007       strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1008     }
1009     strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1010   }
1011   if (!alf.exactMatch) {
1012       strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1013   }
1014   log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1015                          (on) ? "+" : "-",
1016                          name,
1017                          tagset_buffer,
1018                          (on) ? LogLevel::name(alf.level) : "off");
1019 }
1020 
1021 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1022   for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1023     const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1024     if (strcmp(alf.alias_name, name) == 0) {
1025       log_deprecated_flag(name, on, alf);
1026       return alf;
1027     }
1028   }
1029   AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1030   return a;
1031 }
1032 
1033 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1034 
1035   // range of acceptable characters spelled out for portability reasons
1036 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1037 #define BUFLEN 255
1038   char name[BUFLEN+1];
1039   char dummy;
1040   const char* real_name;
1041   bool warn_if_deprecated = true;
1042 
1043   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1044     AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1045     if (alf.alias_name != NULL){
1046       LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1047       return true;
1048     }
1049     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1050     if (real_name == NULL) {
1051       return false;
1052     }
1053     return set_bool_flag(real_name, false, origin);
1054   }
1055   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1056     AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1057     if (alf.alias_name != NULL){
1058       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1059       return true;
1060     }
1061     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1062     if (real_name == NULL) {
1063       return false;
1064     }
1065     return set_bool_flag(real_name, true, origin);
1066   }
1067 
1068   char punct;
1069   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1070     const char* value = strchr(arg, '=') + 1;
1071     JVMFlag* flag;
1072 
1073     // this scanf pattern matches both strings (handled here) and numbers (handled later))
1074     AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1075     if (alf.alias_name != NULL) {
1076       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1077       return true;
1078     }
1079     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1080     if (real_name == NULL) {
1081       return false;
1082     }
1083     flag = JVMFlag::find_flag(real_name);
1084     if (flag != NULL && flag->is_ccstr()) {
1085       if (flag->ccstr_accumulates()) {
1086         return append_to_string_flag(real_name, value, origin);
1087       } else {
1088         if (value[0] == '\0') {
1089           value = NULL;
1090         }
1091         return set_string_flag(real_name, value, origin);
1092       }
1093     } else {
1094       warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1095     }
1096   }
1097 
1098   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1099     const char* value = strchr(arg, '=') + 1;
1100     // -XX:Foo:=xxx will reset the string flag to the given value.
1101     if (value[0] == '\0') {
1102       value = NULL;
1103     }
1104     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1105     if (real_name == NULL) {
1106       return false;
1107     }
1108     return set_string_flag(real_name, value, origin);
1109   }
1110 
1111 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1112 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
1113 #define        NUMBER_RANGE    "[0123456789eE+-]"
1114   char value[BUFLEN + 1];
1115   char value2[BUFLEN + 1];
1116   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1117     // Looks like a floating-point number -- try again with more lenient format string
1118     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1119       real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1120       if (real_name == NULL) {
1121         return false;
1122       }
1123       return set_fp_numeric_flag(real_name, value, origin);
1124     }
1125   }
1126 
1127 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1128   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1129     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1130     if (real_name == NULL) {
1131       return false;
1132     }
1133     return set_numeric_flag(real_name, value, origin);
1134   }
1135 
1136   return false;
1137 }
1138 
1139 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1140   assert(bldarray != NULL, "illegal argument");
1141 
1142   if (arg == NULL) {
1143     return;
1144   }
1145 
1146   int new_count = *count + 1;
1147 
1148   // expand the array and add arg to the last element
1149   if (*bldarray == NULL) {
1150     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1151   } else {
1152     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1153   }
1154   (*bldarray)[*count] = os::strdup_check_oom(arg);
1155   *count = new_count;
1156 }
1157 
1158 void Arguments::build_jvm_args(const char* arg) {
1159   add_string(&_jvm_args_array, &_num_jvm_args, arg);
1160 }
1161 
1162 void Arguments::build_jvm_flags(const char* arg) {
1163   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1164 }
1165 
1166 // utility function to return a string that concatenates all
1167 // strings in a given char** array
1168 const char* Arguments::build_resource_string(char** args, int count) {
1169   if (args == NULL || count == 0) {
1170     return NULL;
1171   }
1172   size_t length = 0;
1173   for (int i = 0; i < count; i++) {
1174     length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1175   }
1176   char* s = NEW_RESOURCE_ARRAY(char, length);
1177   char* dst = s;
1178   for (int j = 0; j < count; j++) {
1179     size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1180     jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1181     dst += offset;
1182     length -= offset;
1183   }
1184   return (const char*) s;
1185 }
1186 
1187 void Arguments::print_on(outputStream* st) {
1188   st->print_cr("VM Arguments:");
1189   if (num_jvm_flags() > 0) {
1190     st->print("jvm_flags: "); print_jvm_flags_on(st);
1191     st->cr();
1192   }
1193   if (num_jvm_args() > 0) {
1194     st->print("jvm_args: "); print_jvm_args_on(st);
1195     st->cr();
1196   }
1197   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1198   if (_java_class_path != NULL) {
1199     char* path = _java_class_path->value();
1200     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1201   }
1202   st->print_cr("Launcher Type: %s", _sun_java_launcher);
1203 }
1204 
1205 void Arguments::print_summary_on(outputStream* st) {
1206   // Print the command line.  Environment variables that are helpful for
1207   // reproducing the problem are written later in the hs_err file.
1208   // flags are from setting file
1209   if (num_jvm_flags() > 0) {
1210     st->print_raw("Settings File: ");
1211     print_jvm_flags_on(st);
1212     st->cr();
1213   }
1214   // args are the command line and environment variable arguments.
1215   st->print_raw("Command Line: ");
1216   if (num_jvm_args() > 0) {
1217     print_jvm_args_on(st);
1218   }
1219   // this is the classfile and any arguments to the java program
1220   if (java_command() != NULL) {
1221     st->print("%s", java_command());
1222   }
1223   st->cr();
1224 }
1225 
1226 void Arguments::print_jvm_flags_on(outputStream* st) {
1227   if (_num_jvm_flags > 0) {
1228     for (int i=0; i < _num_jvm_flags; i++) {
1229       st->print("%s ", _jvm_flags_array[i]);
1230     }
1231   }
1232 }
1233 
1234 void Arguments::print_jvm_args_on(outputStream* st) {
1235   if (_num_jvm_args > 0) {
1236     for (int i=0; i < _num_jvm_args; i++) {
1237       st->print("%s ", _jvm_args_array[i]);
1238     }
1239   }
1240 }
1241 
1242 bool Arguments::process_argument(const char* arg,
1243                                  jboolean ignore_unrecognized,
1244                                  JVMFlag::Flags origin) {
1245   JDK_Version since = JDK_Version();
1246 
1247   if (parse_argument(arg, origin)) {
1248     return true;
1249   }
1250 
1251   // Determine if the flag has '+', '-', or '=' characters.
1252   bool has_plus_minus = (*arg == '+' || *arg == '-');
1253   const char* const argname = has_plus_minus ? arg + 1 : arg;
1254 
1255   size_t arg_len;
1256   const char* equal_sign = strchr(argname, '=');
1257   if (equal_sign == NULL) {
1258     arg_len = strlen(argname);
1259   } else {
1260     arg_len = equal_sign - argname;
1261   }
1262 
1263   // Only make the obsolete check for valid arguments.
1264   if (arg_len <= BUFLEN) {
1265     // Construct a string which consists only of the argument name without '+', '-', or '='.
1266     char stripped_argname[BUFLEN+1]; // +1 for '\0'
1267     jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1268     if (is_obsolete_flag(stripped_argname, &since)) {
1269       char version[256];
1270       since.to_string(version, sizeof(version));
1271       warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1272       return true;
1273     }
1274 #ifndef PRODUCT
1275     else {
1276       const char* replacement;
1277       if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1278         log_warning(arguments)("%s has been removed. Please use %s instead.",
1279                                stripped_argname,
1280                                replacement);
1281         return false;
1282       }
1283     }
1284 #endif //PRODUCT
1285   }
1286 
1287   // For locked flags, report a custom error message if available.
1288   // Otherwise, report the standard unrecognized VM option.
1289   JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1290   if (found_flag != NULL) {
1291     char locked_message_buf[BUFLEN];
1292     JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1293     if (strlen(locked_message_buf) == 0) {
1294       if (found_flag->is_bool() && !has_plus_minus) {
1295         jio_fprintf(defaultStream::error_stream(),
1296           "Missing +/- setting for VM option '%s'\n", argname);
1297       } else if (!found_flag->is_bool() && has_plus_minus) {
1298         jio_fprintf(defaultStream::error_stream(),
1299           "Unexpected +/- setting in VM option '%s'\n", argname);
1300       } else {
1301         jio_fprintf(defaultStream::error_stream(),
1302           "Improperly specified VM option '%s'\n", argname);
1303       }
1304     } else {
1305 #ifdef PRODUCT
1306       bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1307                          (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1308       if (ignore_unrecognized && mismatched) {
1309         return true;
1310       }
1311 #endif
1312       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1313     }
1314   } else {
1315     if (ignore_unrecognized) {
1316       return true;
1317     }
1318     jio_fprintf(defaultStream::error_stream(),
1319                 "Unrecognized VM option '%s'\n", argname);
1320     JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1321     if (fuzzy_matched != NULL) {
1322       jio_fprintf(defaultStream::error_stream(),
1323                   "Did you mean '%s%s%s'? ",
1324                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1325                   fuzzy_matched->_name,
1326                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
1327     }
1328   }
1329 
1330   // allow for commandline "commenting out" options like -XX:#+Verbose
1331   return arg[0] == '#';
1332 }
1333 
1334 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1335   FILE* stream = fopen(file_name, "rb");
1336   if (stream == NULL) {
1337     if (should_exist) {
1338       jio_fprintf(defaultStream::error_stream(),
1339                   "Could not open settings file %s\n", file_name);
1340       return false;
1341     } else {
1342       return true;
1343     }
1344   }
1345 
1346   char token[1024];
1347   int  pos = 0;
1348 
1349   bool in_white_space = true;
1350   bool in_comment     = false;
1351   bool in_quote       = false;
1352   char quote_c        = 0;
1353   bool result         = true;
1354 
1355   int c = getc(stream);
1356   while(c != EOF && pos < (int)(sizeof(token)-1)) {
1357     if (in_white_space) {
1358       if (in_comment) {
1359         if (c == '\n') in_comment = false;
1360       } else {
1361         if (c == '#') in_comment = true;
1362         else if (!isspace(c)) {
1363           in_white_space = false;
1364           token[pos++] = c;
1365         }
1366       }
1367     } else {
1368       if (c == '\n' || (!in_quote && isspace(c))) {
1369         // token ends at newline, or at unquoted whitespace
1370         // this allows a way to include spaces in string-valued options
1371         token[pos] = '\0';
1372         logOption(token);
1373         result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1374         build_jvm_flags(token);
1375         pos = 0;
1376         in_white_space = true;
1377         in_quote = false;
1378       } else if (!in_quote && (c == '\'' || c == '"')) {
1379         in_quote = true;
1380         quote_c = c;
1381       } else if (in_quote && (c == quote_c)) {
1382         in_quote = false;
1383       } else {
1384         token[pos++] = c;
1385       }
1386     }
1387     c = getc(stream);
1388   }
1389   if (pos > 0) {
1390     token[pos] = '\0';
1391     result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1392     build_jvm_flags(token);
1393   }
1394   fclose(stream);
1395   return result;
1396 }
1397 
1398 //=============================================================================================================
1399 // Parsing of properties (-D)
1400 
1401 const char* Arguments::get_property(const char* key) {
1402   return PropertyList_get_value(system_properties(), key);
1403 }
1404 
1405 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1406   const char* eq = strchr(prop, '=');
1407   const char* key;
1408   const char* value = "";
1409 
1410   if (eq == NULL) {
1411     // property doesn't have a value, thus use passed string
1412     key = prop;
1413   } else {
1414     // property have a value, thus extract it and save to the
1415     // allocated string
1416     size_t key_len = eq - prop;
1417     char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1418 
1419     jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1420     key = tmp_key;
1421 
1422     value = &prop[key_len + 1];
1423   }
1424 
1425   if (strcmp(key, "java.compiler") == 0) {
1426     process_java_compiler_argument(value);
1427     // Record value in Arguments, but let it get passed to Java.
1428   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1429              strcmp(key, "sun.java.launcher.pid") == 0) {
1430     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1431     // private and are processed in process_sun_java_launcher_properties();
1432     // the sun.java.launcher property is passed on to the java application
1433   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1434     // append is true, writable is true, internal is false
1435     PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1436                             WriteableProperty, ExternalProperty);
1437   } else {
1438     if (strcmp(key, "sun.java.command") == 0) {
1439       char *old_java_command = _java_command;
1440       _java_command = os::strdup_check_oom(value, mtArguments);
1441       if (old_java_command != NULL) {
1442         os::free(old_java_command);
1443       }
1444     } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1445       const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1446       // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1447       // its value without going through the property list or making a Java call.
1448       _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1449       if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1450         assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1451         os::free((void *)old_java_vendor_url_bug);
1452       }
1453     }
1454 
1455     // Create new property and add at the end of the list
1456     PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1457   }
1458 
1459   if (key != prop) {
1460     // SystemProperty copy passed value, thus free previously allocated
1461     // memory
1462     FreeHeap((void *)key);
1463   }
1464 
1465   return true;
1466 }
1467 
1468 #if INCLUDE_CDS
1469 const char* unsupported_properties[] = { "jdk.module.limitmods",
1470                                          "jdk.module.upgrade.path",
1471                                          "jdk.module.patch.0" };
1472 const char* unsupported_options[] = { "--limit-modules",
1473                                       "--upgrade-module-path",
1474                                       "--patch-module"
1475                                     };
1476 void Arguments::check_unsupported_dumping_properties() {
1477   assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1478   assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1479   // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1480   SystemProperty* sp = system_properties();
1481   while (sp != NULL) {
1482     for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1483       if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1484         vm_exit_during_initialization(
1485           "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1486       }
1487     }
1488     sp = sp->next();
1489   }
1490 
1491   // Check for an exploded module build in use with -Xshare:dump.
1492   if (!has_jimage()) {
1493     vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1494   }
1495 }
1496 
1497 bool Arguments::check_unsupported_cds_runtime_properties() {
1498   assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1499   assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1500   for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1501     if (get_property(unsupported_properties[i]) != NULL) {
1502       if (RequireSharedSpaces) {
1503         warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1504       }
1505       return true;
1506     }
1507   }
1508   return false;
1509 }
1510 #endif
1511 
1512 //===========================================================================================================
1513 // Setting int/mixed/comp mode flags
1514 
1515 void Arguments::set_mode_flags(Mode mode) {
1516   // Set up default values for all flags.
1517   // If you add a flag to any of the branches below,
1518   // add a default value for it here.
1519   set_java_compiler(false);
1520   _mode                      = mode;
1521 
1522   // Ensure Agent_OnLoad has the correct initial values.
1523   // This may not be the final mode; mode may change later in onload phase.
1524   PropertyList_unique_add(&_system_properties, "java.vm.info",
1525                           VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1526 
1527   UseInterpreter             = true;
1528   UseCompiler                = true;
1529   UseLoopCounter             = true;
1530 
1531   // Default values may be platform/compiler dependent -
1532   // use the saved values
1533   ClipInlining               = Arguments::_ClipInlining;
1534   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1535   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1536   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1537   if (TieredCompilation) {
1538     if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1539       Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1540     }
1541     if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1542       Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1543     }
1544   }
1545 
1546   // Change from defaults based on mode
1547   switch (mode) {
1548   default:
1549     ShouldNotReachHere();
1550     break;
1551   case _int:
1552     UseCompiler              = false;
1553     UseLoopCounter           = false;
1554     AlwaysCompileLoopMethods = false;
1555     UseOnStackReplacement    = false;
1556     break;
1557   case _mixed:
1558     // same as default
1559     break;
1560   case _comp:
1561     UseInterpreter           = false;
1562     BackgroundCompilation    = false;
1563     ClipInlining             = false;
1564     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1565     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1566     // compile a level 4 (C2) and then continue executing it.
1567     if (TieredCompilation) {
1568       Tier3InvokeNotifyFreqLog = 0;
1569       Tier4InvocationThreshold = 0;
1570     }
1571     break;
1572   }
1573 }
1574 
1575 // Conflict: required to use shared spaces (-Xshare:on), but
1576 // incompatible command line options were chosen.
1577 static void no_shared_spaces(const char* message) {
1578   if (RequireSharedSpaces) {
1579     jio_fprintf(defaultStream::error_stream(),
1580       "Class data sharing is inconsistent with other specified options.\n");
1581     vm_exit_during_initialization("Unable to use shared archive.", message);
1582   } else {
1583     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1584   }
1585 }
1586 
1587 // Returns threshold scaled with the value of scale.
1588 // If scale < 0.0, threshold is returned without scaling.
1589 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1590   if (scale == 1.0 || scale < 0.0) {
1591     return threshold;
1592   } else {
1593     return (intx)(threshold * scale);
1594   }
1595 }
1596 
1597 // Returns freq_log scaled with the value of scale.
1598 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1599 // If scale < 0.0, freq_log is returned without scaling.
1600 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1601   // Check if scaling is necessary or if negative value was specified.
1602   if (scale == 1.0 || scale < 0.0) {
1603     return freq_log;
1604   }
1605   // Check values to avoid calculating log2 of 0.
1606   if (scale == 0.0 || freq_log == 0) {
1607     return 0;
1608   }
1609   // Determine the maximum notification frequency value currently supported.
1610   // The largest mask value that the interpreter/C1 can handle is
1611   // of length InvocationCounter::number_of_count_bits. Mask values are always
1612   // one bit shorter then the value of the notification frequency. Set
1613   // max_freq_bits accordingly.
1614   intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1615   intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1616   if (scaled_freq == 0) {
1617     // Return 0 right away to avoid calculating log2 of 0.
1618     return 0;
1619   } else if (scaled_freq > nth_bit(max_freq_bits)) {
1620     return max_freq_bits;
1621   } else {
1622     return log2_intptr(scaled_freq);
1623   }
1624 }
1625 
1626 void Arguments::set_tiered_flags() {
1627   // With tiered, set default policy to SimpleThresholdPolicy, which is 2.
1628   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1629     FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
1630   }
1631   if (CompilationPolicyChoice < 2) {
1632     vm_exit_during_initialization(
1633       "Incompatible compilation policy selected", NULL);
1634   }
1635   // Increase the code cache size - tiered compiles a lot more.
1636   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1637     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1638                   MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1639   }
1640   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1641   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1642     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1643   }
1644   if (!UseInterpreter) { // -Xcomp
1645     Tier3InvokeNotifyFreqLog = 0;
1646     Tier4InvocationThreshold = 0;
1647   }
1648 
1649   if (CompileThresholdScaling < 0) {
1650     vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1651   }
1652 
1653   // Scale tiered compilation thresholds.
1654   // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1655   if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1656     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1657     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1658 
1659     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1660     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1661     FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1662     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1663 
1664     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1665     // once these thresholds become supported.
1666 
1667     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1668     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1669 
1670     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1671     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1672 
1673     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1674 
1675     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1676     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1677     FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1678     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1679   }
1680 }
1681 
1682 void set_object_alignment() {
1683   // Object alignment.
1684   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1685   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1686   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1687   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1688   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1689   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1690 
1691   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1692   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1693 
1694   // Oop encoding heap max
1695   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1696 
1697   if (SurvivorAlignmentInBytes == 0) {
1698     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1699   }
1700 }
1701 
1702 size_t Arguments::max_heap_for_compressed_oops() {
1703   // Avoid sign flip.
1704   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1705   // We need to fit both the NULL page and the heap into the memory budget, while
1706   // keeping alignment constraints of the heap. To guarantee the latter, as the
1707   // NULL page is located before the heap, we pad the NULL page to the conservative
1708   // maximum alignment that the GC may ever impose upon the heap.
1709   size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1710                                                   _conservative_max_heap_alignment);
1711 
1712   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1713   NOT_LP64(ShouldNotReachHere(); return 0);
1714 }
1715 
1716 void Arguments::set_use_compressed_oops() {
1717 #ifndef ZERO
1718 #ifdef _LP64
1719   // MaxHeapSize is not set up properly at this point, but
1720   // the only value that can override MaxHeapSize if we are
1721   // to use UseCompressedOops is InitialHeapSize.
1722   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1723 
1724   if (max_heap_size <= max_heap_for_compressed_oops()) {
1725 #if !defined(COMPILER1) || defined(TIERED)
1726     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1727       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1728     }
1729 #endif
1730   } else {
1731     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1732       warning("Max heap size too large for Compressed Oops");
1733       FLAG_SET_DEFAULT(UseCompressedOops, false);
1734       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1735     }
1736   }
1737 #endif // _LP64
1738 #endif // ZERO
1739 }
1740 
1741 
1742 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1743 // set_use_compressed_oops().
1744 void Arguments::set_use_compressed_klass_ptrs() {
1745 #ifndef ZERO
1746 #ifdef _LP64
1747   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1748   if (!UseCompressedOops) {
1749     if (UseCompressedClassPointers) {
1750       warning("UseCompressedClassPointers requires UseCompressedOops");
1751     }
1752     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1753   } else {
1754     // Turn on UseCompressedClassPointers too
1755     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1756       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1757     }
1758     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1759     if (UseCompressedClassPointers) {
1760       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1761         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1762         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1763       }
1764     }
1765   }
1766 #endif // _LP64
1767 #endif // !ZERO
1768 }
1769 
1770 void Arguments::set_conservative_max_heap_alignment() {
1771   // The conservative maximum required alignment for the heap is the maximum of
1772   // the alignments imposed by several sources: any requirements from the heap
1773   // itself, the collector policy and the maximum page size we may run the VM
1774   // with.
1775   size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1776   _conservative_max_heap_alignment = MAX4(heap_alignment,
1777                                           (size_t)os::vm_allocation_granularity(),
1778                                           os::max_page_size(),
1779                                           CollectorPolicy::compute_heap_alignment());
1780 }
1781 
1782 #ifdef TIERED
1783 bool Arguments::compilation_mode_selected() {
1784  return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1785         !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1786 
1787 }
1788 
1789 void Arguments::select_compilation_mode_ergonomically() {
1790 #if defined(_WINDOWS) && !defined(_LP64)
1791   if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1792     FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1793   }
1794 #endif
1795   if (NeverActAsServerClassMachine) {
1796     set_client_compilation_mode();
1797   }
1798 }
1799 #endif //TIERED
1800 
1801 #if INCLUDE_JVMCI
1802 void Arguments::set_jvmci_specific_flags() {
1803   if (UseJVMCICompiler) {
1804     if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1805       FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1806     }
1807     if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1808       FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1809     }
1810     if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1811       FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1812     }
1813     if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1814       FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1815     }
1816     if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1817       FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1818     }
1819     if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1820       FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1821     }
1822     if (TieredStopAtLevel != CompLevel_full_optimization) {
1823       // Currently JVMCI compiler can only work at the full optimization level
1824       warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1825       TieredStopAtLevel = CompLevel_full_optimization;
1826     }
1827     if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1828       FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1829     }
1830   }
1831 }
1832 #endif
1833 
1834 jint Arguments::set_ergonomics_flags() {
1835 #ifdef TIERED
1836   if (!compilation_mode_selected()) {
1837     select_compilation_mode_ergonomically();
1838   }
1839 #endif
1840 
1841   GCConfig::initialize();
1842 
1843 #if defined(IA32)
1844   // Only server compiler can optimize safepoints well enough.
1845   if (!is_server_compilation_mode_vm()) {
1846     FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false);
1847   }
1848 #endif
1849 
1850   set_conservative_max_heap_alignment();
1851 
1852 #ifndef ZERO
1853 #ifdef _LP64
1854   set_use_compressed_oops();
1855 
1856   // set_use_compressed_klass_ptrs() must be called after calling
1857   // set_use_compressed_oops().
1858   set_use_compressed_klass_ptrs();
1859 
1860   // Also checks that certain machines are slower with compressed oops
1861   // in vm_version initialization code.
1862 #endif // _LP64
1863 #endif // !ZERO
1864 
1865   return JNI_OK;
1866 }
1867 
1868 julong Arguments::limit_by_allocatable_memory(julong limit) {
1869   julong max_allocatable;
1870   julong result = limit;
1871   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1872     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1873   }
1874   return result;
1875 }
1876 
1877 // Use static initialization to get the default before parsing
1878 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1879 
1880 void Arguments::set_heap_size() {
1881   julong phys_mem =
1882     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1883                             : (julong)MaxRAM;
1884 
1885   // Convert deprecated flags
1886   if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1887       !FLAG_IS_DEFAULT(MaxRAMFraction))
1888     MaxRAMPercentage = 100.0 / MaxRAMFraction;
1889 
1890   if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1891       !FLAG_IS_DEFAULT(MinRAMFraction))
1892     MinRAMPercentage = 100.0 / MinRAMFraction;
1893 
1894   if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1895       !FLAG_IS_DEFAULT(InitialRAMFraction))
1896     InitialRAMPercentage = 100.0 / InitialRAMFraction;
1897 
1898   // If the maximum heap size has not been set with -Xmx,
1899   // then set it as fraction of the size of physical memory,
1900   // respecting the maximum and minimum sizes of the heap.
1901   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1902     julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1903     const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1904     if (reasonable_min < MaxHeapSize) {
1905       // Small physical memory, so use a minimum fraction of it for the heap
1906       reasonable_max = reasonable_min;
1907     } else {
1908       // Not-small physical memory, so require a heap at least
1909       // as large as MaxHeapSize
1910       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1911     }
1912 
1913     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1914       // Limit the heap size to ErgoHeapSizeLimit
1915       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1916     }
1917     if (UseCompressedOops) {
1918       // Limit the heap size to the maximum possible when using compressed oops
1919       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1920 
1921       // HeapBaseMinAddress can be greater than default but not less than.
1922       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1923         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1924           // matches compressed oops printing flags
1925           log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1926                                      " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1927                                      DefaultHeapBaseMinAddress,
1928                                      DefaultHeapBaseMinAddress/G,
1929                                      HeapBaseMinAddress);
1930           FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1931         }
1932       }
1933 
1934       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1935         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1936         // but it should be not less than default MaxHeapSize.
1937         max_coop_heap -= HeapBaseMinAddress;
1938       }
1939       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1940     }
1941     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1942 
1943     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1944       // An initial heap size was specified on the command line,
1945       // so be sure that the maximum size is consistent.  Done
1946       // after call to limit_by_allocatable_memory because that
1947       // method might reduce the allocation size.
1948       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1949     }
1950 
1951     log_trace(gc, heap)("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1952     FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1953   }
1954 
1955   // If the minimum or initial heap_size have not been set or requested to be set
1956   // ergonomically, set them accordingly.
1957   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1958     julong reasonable_minimum = (julong)(OldSize + NewSize);
1959 
1960     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1961 
1962     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1963 
1964     if (InitialHeapSize == 0) {
1965       julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1966 
1967       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1968       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1969 
1970       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1971 
1972       log_trace(gc, heap)("  Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1973       FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1974     }
1975     // If the minimum heap size has not been set (via -Xms),
1976     // synchronize with InitialHeapSize to avoid errors with the default value.
1977     if (min_heap_size() == 0) {
1978       set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1979       log_trace(gc, heap)("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1980     }
1981   }
1982 }
1983 
1984 // This option inspects the machine and attempts to set various
1985 // parameters to be optimal for long-running, memory allocation
1986 // intensive jobs.  It is intended for machines with large
1987 // amounts of cpu and memory.
1988 jint Arguments::set_aggressive_heap_flags() {
1989   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1990   // VM, but we may not be able to represent the total physical memory
1991   // available (like having 8gb of memory on a box but using a 32bit VM).
1992   // Thus, we need to make sure we're using a julong for intermediate
1993   // calculations.
1994   julong initHeapSize;
1995   julong total_memory = os::physical_memory();
1996 
1997   if (total_memory < (julong) 256 * M) {
1998     jio_fprintf(defaultStream::error_stream(),
1999             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2000     vm_exit(1);
2001   }
2002 
2003   // The heap size is half of available memory, or (at most)
2004   // all of possible memory less 160mb (leaving room for the OS
2005   // when using ISM).  This is the maximum; because adaptive sizing
2006   // is turned on below, the actual space used may be smaller.
2007 
2008   initHeapSize = MIN2(total_memory / (julong) 2,
2009           total_memory - (julong) 160 * M);
2010 
2011   initHeapSize = limit_by_allocatable_memory(initHeapSize);
2012 
2013   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2014     if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
2015       return JNI_EINVAL;
2016     }
2017     if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
2018       return JNI_EINVAL;
2019     }
2020     // Currently the minimum size and the initial heap sizes are the same.
2021     set_min_heap_size(initHeapSize);
2022   }
2023   if (FLAG_IS_DEFAULT(NewSize)) {
2024     // Make the young generation 3/8ths of the total heap.
2025     if (FLAG_SET_CMDLINE(size_t, NewSize,
2026             ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
2027       return JNI_EINVAL;
2028     }
2029     if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
2030       return JNI_EINVAL;
2031     }
2032   }
2033 
2034 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
2035   FLAG_SET_DEFAULT(UseLargePages, true);
2036 #endif
2037 
2038   // Increase some data structure sizes for efficiency
2039   if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
2040     return JNI_EINVAL;
2041   }
2042   if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) {
2043     return JNI_EINVAL;
2044   }
2045   if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) {
2046     return JNI_EINVAL;
2047   }
2048 
2049   // See the OldPLABSize comment below, but replace 'after promotion'
2050   // with 'after copying'.  YoungPLABSize is the size of the survivor
2051   // space per-gc-thread buffers.  The default is 4kw.
2052   if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2053     return JNI_EINVAL;
2054   }
2055 
2056   // OldPLABSize is the size of the buffers in the old gen that
2057   // UseParallelGC uses to promote live data that doesn't fit in the
2058   // survivor spaces.  At any given time, there's one for each gc thread.
2059   // The default size is 1kw. These buffers are rarely used, since the
2060   // survivor spaces are usually big enough.  For specjbb, however, there
2061   // are occasions when there's lots of live data in the young gen
2062   // and we end up promoting some of it.  We don't have a definite
2063   // explanation for why bumping OldPLABSize helps, but the theory
2064   // is that a bigger PLAB results in retaining something like the
2065   // original allocation order after promotion, which improves mutator
2066   // locality.  A minor effect may be that larger PLABs reduce the
2067   // number of PLAB allocation events during gc.  The value of 8kw
2068   // was arrived at by experimenting with specjbb.
2069   if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
2070     return JNI_EINVAL;
2071   }
2072 
2073   // Enable parallel GC and adaptive generation sizing
2074   if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) {
2075     return JNI_EINVAL;
2076   }
2077 
2078   // Encourage steady state memory management
2079   if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
2080     return JNI_EINVAL;
2081   }
2082 
2083   // This appears to improve mutator locality
2084   if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2085     return JNI_EINVAL;
2086   }
2087 
2088   // Get around early Solaris scheduling bug
2089   // (affinity vs other jobs on system)
2090   // but disallow DR and offlining (5008695).
2091   if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
2092     return JNI_EINVAL;
2093   }
2094 
2095   return JNI_OK;
2096 }
2097 
2098 // This must be called after ergonomics.
2099 void Arguments::set_bytecode_flags() {
2100   if (!RewriteBytecodes) {
2101     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2102   }
2103 }
2104 
2105 // Aggressive optimization flags  -XX:+AggressiveOpts
2106 jint Arguments::set_aggressive_opts_flags() {
2107 #ifdef COMPILER2
2108   if (AggressiveUnboxing) {
2109     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2110       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2111     } else if (!EliminateAutoBox) {
2112       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2113       AggressiveUnboxing = false;
2114     }
2115     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2116       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2117     } else if (!DoEscapeAnalysis) {
2118       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2119       AggressiveUnboxing = false;
2120     }
2121   }
2122   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2123     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2124       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2125     }
2126     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2127       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2128     }
2129 
2130     // Feed the cache size setting into the JDK
2131     char buffer[1024];
2132     jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2133     if (!add_property(buffer)) {
2134       return JNI_ENOMEM;
2135     }
2136   }
2137   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2138     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2139   }
2140 #endif
2141 
2142   if (AggressiveOpts) {
2143 // Sample flag setting code
2144 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2145 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
2146 //    }
2147   }
2148 
2149   return JNI_OK;
2150 }
2151 
2152 //===========================================================================================================
2153 // Parsing of java.compiler property
2154 
2155 void Arguments::process_java_compiler_argument(const char* arg) {
2156   // For backwards compatibility, Djava.compiler=NONE or ""
2157   // causes us to switch to -Xint mode UNLESS -Xdebug
2158   // is also specified.
2159   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2160     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2161   }
2162 }
2163 
2164 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2165   _sun_java_launcher = os::strdup_check_oom(launcher);
2166 }
2167 
2168 bool Arguments::created_by_java_launcher() {
2169   assert(_sun_java_launcher != NULL, "property must have value");
2170   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2171 }
2172 
2173 bool Arguments::sun_java_launcher_is_altjvm() {
2174   return _sun_java_launcher_is_altjvm;
2175 }
2176 
2177 //===========================================================================================================
2178 // Parsing of main arguments
2179 
2180 #if INCLUDE_JVMCI
2181 // Check consistency of jvmci vm argument settings.
2182 bool Arguments::check_jvmci_args_consistency() {
2183    return JVMCIGlobals::check_jvmci_flags_are_consistent();
2184 }
2185 #endif //INCLUDE_JVMCI
2186 
2187 // Check the consistency of vm_init_args
2188 bool Arguments::check_vm_args_consistency() {
2189   // Method for adding checks for flag consistency.
2190   // The intent is to warn the user of all possible conflicts,
2191   // before returning an error.
2192   // Note: Needs platform-dependent factoring.
2193   bool status = true;
2194 
2195   if (TLABRefillWasteFraction == 0) {
2196     jio_fprintf(defaultStream::error_stream(),
2197                 "TLABRefillWasteFraction should be a denominator, "
2198                 "not " SIZE_FORMAT "\n",
2199                 TLABRefillWasteFraction);
2200     status = false;
2201   }
2202 
2203   if (PrintNMTStatistics) {
2204 #if INCLUDE_NMT
2205     if (MemTracker::tracking_level() == NMT_off) {
2206 #endif // INCLUDE_NMT
2207       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2208       PrintNMTStatistics = false;
2209 #if INCLUDE_NMT
2210     }
2211 #endif
2212   }
2213 
2214 #if INCLUDE_JVMCI
2215   status = status && check_jvmci_args_consistency();
2216 
2217   if (EnableJVMCI) {
2218     PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2219         AddProperty, UnwriteableProperty, InternalProperty);
2220 
2221     if (!ScavengeRootsInCode) {
2222       warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2223       ScavengeRootsInCode = 1;
2224     }
2225   }
2226 #endif
2227 
2228   // Check lower bounds of the code cache
2229   // Template Interpreter code is approximately 3X larger in debug builds.
2230   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2231   if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2232     jio_fprintf(defaultStream::error_stream(),
2233                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2234                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2235     status = false;
2236   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2237     jio_fprintf(defaultStream::error_stream(),
2238                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2239                 min_code_cache_size/K);
2240     status = false;
2241   } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2242     // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2243     jio_fprintf(defaultStream::error_stream(),
2244                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2245                 CODE_CACHE_SIZE_LIMIT/M);
2246     status = false;
2247   } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2248     jio_fprintf(defaultStream::error_stream(),
2249                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2250                 min_code_cache_size/K);
2251     status = false;
2252   }
2253 
2254 #ifdef _LP64
2255   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2256     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2257   }
2258 #endif
2259 
2260 #ifndef SUPPORT_RESERVED_STACK_AREA
2261   if (StackReservedPages != 0) {
2262     FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2263     warning("Reserved Stack Area not supported on this platform");
2264   }
2265 #endif
2266 
2267   if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2268     if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2269       warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2270     }
2271     FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2272   }
2273   if (UseCompiler && is_interpreter_only()) {
2274     if (!FLAG_IS_DEFAULT(UseCompiler)) {
2275       warning("UseCompiler disabled due to -Xint.");
2276     }
2277     FLAG_SET_CMDLINE(bool, UseCompiler, false);
2278   }
2279 #ifdef COMPILER2
2280   if (PostLoopMultiversioning && !RangeCheckElimination) {
2281     if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2282       warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2283     }
2284     FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2285   }
2286   if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
2287     if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2288       warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
2289     }
2290     LoopStripMiningIter = 1;
2291   } else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
2292     if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
2293       warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
2294     }
2295     LoopStripMiningIter = 0;
2296   }
2297 #endif
2298   if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2299     if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2300       log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2301     }
2302   }
2303   return status;
2304 }
2305 
2306 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2307   const char* option_type) {
2308   if (ignore) return false;
2309 
2310   const char* spacer = " ";
2311   if (option_type == NULL) {
2312     option_type = ++spacer; // Set both to the empty string.
2313   }
2314 
2315   if (os::obsolete_option(option)) {
2316     jio_fprintf(defaultStream::error_stream(),
2317                 "Obsolete %s%soption: %s\n", option_type, spacer,
2318       option->optionString);
2319     return false;
2320   } else {
2321     jio_fprintf(defaultStream::error_stream(),
2322                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2323       option->optionString);
2324     return true;
2325   }
2326 }
2327 
2328 static const char* user_assertion_options[] = {
2329   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2330 };
2331 
2332 static const char* system_assertion_options[] = {
2333   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2334 };
2335 
2336 bool Arguments::parse_uintx(const char* value,
2337                             uintx* uintx_arg,
2338                             uintx min_size) {
2339 
2340   // Check the sign first since atojulong() parses only unsigned values.
2341   bool value_is_positive = !(*value == '-');
2342 
2343   if (value_is_positive) {
2344     julong n;
2345     bool good_return = atojulong(value, &n);
2346     if (good_return) {
2347       bool above_minimum = n >= min_size;
2348       bool value_is_too_large = n > max_uintx;
2349 
2350       if (above_minimum && !value_is_too_large) {
2351         *uintx_arg = n;
2352         return true;
2353       }
2354     }
2355   }
2356   return false;
2357 }
2358 
2359 unsigned int addreads_count = 0;
2360 unsigned int addexports_count = 0;
2361 unsigned int addopens_count = 0;
2362 unsigned int addmods_count = 0;
2363 unsigned int patch_mod_count = 0;
2364 
2365 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2366   size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2367   char* property = AllocateHeap(prop_len, mtArguments);
2368   int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2369   if (ret < 0 || ret >= (int)prop_len) {
2370     FreeHeap(property);
2371     return false;
2372   }
2373   bool added = add_property(property, UnwriteableProperty, internal);
2374   FreeHeap(property);
2375   return added;
2376 }
2377 
2378 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2379   const unsigned int props_count_limit = 1000;
2380   const int max_digits = 3;
2381   const int extra_symbols_count = 3; // includes '.', '=', '\0'
2382 
2383   // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2384   if (count < props_count_limit) {
2385     size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2386     char* property = AllocateHeap(prop_len, mtArguments);
2387     int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2388     if (ret < 0 || ret >= (int)prop_len) {
2389       FreeHeap(property);
2390       jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2391       return false;
2392     }
2393     bool added = add_property(property, UnwriteableProperty, InternalProperty);
2394     FreeHeap(property);
2395     return added;
2396   }
2397 
2398   jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2399   return false;
2400 }
2401 
2402 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2403                                                   julong* long_arg,
2404                                                   julong min_size,
2405                                                   julong max_size) {
2406   if (!atojulong(s, long_arg)) return arg_unreadable;
2407   return check_memory_size(*long_arg, min_size, max_size);
2408 }
2409 
2410 // Parse JavaVMInitArgs structure
2411 
2412 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2413                                    const JavaVMInitArgs *java_options_args,
2414                                    const JavaVMInitArgs *cmd_line_args) {
2415   bool patch_mod_javabase = false;
2416 
2417   // Save default settings for some mode flags
2418   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2419   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2420   Arguments::_ClipInlining             = ClipInlining;
2421   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2422   if (TieredCompilation) {
2423     Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2424     Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2425   }
2426 
2427   // Setup flags for mixed which is the default
2428   set_mode_flags(_mixed);
2429 
2430   // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2431   // variable (if present).
2432   jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2433   if (result != JNI_OK) {
2434     return result;
2435   }
2436 
2437   // Parse args structure generated from the command line flags.
2438   result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2439   if (result != JNI_OK) {
2440     return result;
2441   }
2442 
2443   // Parse args structure generated from the _JAVA_OPTIONS environment
2444   // variable (if present) (mimics classic VM)
2445   result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2446   if (result != JNI_OK) {
2447     return result;
2448   }
2449 
2450   // We need to ensure processor and memory resources have been properly
2451   // configured - which may rely on arguments we just processed - before
2452   // doing the final argument processing. Any argument processing that
2453   // needs to know about processor and memory resources must occur after
2454   // this point.
2455 
2456   os::init_container_support();
2457 
2458   // Do final processing now that all arguments have been parsed
2459   result = finalize_vm_init_args(patch_mod_javabase);
2460   if (result != JNI_OK) {
2461     return result;
2462   }
2463 
2464   return JNI_OK;
2465 }
2466 
2467 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2468 // represents a valid JDWP agent.  is_path==true denotes that we
2469 // are dealing with -agentpath (case where name is a path), otherwise with
2470 // -agentlib
2471 bool valid_jdwp_agent(char *name, bool is_path) {
2472   char *_name;
2473   const char *_jdwp = "jdwp";
2474   size_t _len_jdwp, _len_prefix;
2475 
2476   if (is_path) {
2477     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2478       return false;
2479     }
2480 
2481     _name++;  // skip past last path separator
2482     _len_prefix = strlen(JNI_LIB_PREFIX);
2483 
2484     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2485       return false;
2486     }
2487 
2488     _name += _len_prefix;
2489     _len_jdwp = strlen(_jdwp);
2490 
2491     if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2492       _name += _len_jdwp;
2493     }
2494     else {
2495       return false;
2496     }
2497 
2498     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2499       return false;
2500     }
2501 
2502     return true;
2503   }
2504 
2505   if (strcmp(name, _jdwp) == 0) {
2506     return true;
2507   }
2508 
2509   return false;
2510 }
2511 
2512 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2513   // --patch-module=<module>=<file>(<pathsep><file>)*
2514   assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2515   // Find the equal sign between the module name and the path specification
2516   const char* module_equal = strchr(patch_mod_tail, '=');
2517   if (module_equal == NULL) {
2518     jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2519     return JNI_ERR;
2520   } else {
2521     // Pick out the module name
2522     size_t module_len = module_equal - patch_mod_tail;
2523     char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2524     if (module_name != NULL) {
2525       memcpy(module_name, patch_mod_tail, module_len);
2526       *(module_name + module_len) = '\0';
2527       // The path piece begins one past the module_equal sign
2528       add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2529       FREE_C_HEAP_ARRAY(char, module_name);
2530       if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2531         return JNI_ENOMEM;
2532       }
2533     } else {
2534       return JNI_ENOMEM;
2535     }
2536   }
2537   return JNI_OK;
2538 }
2539 
2540 // Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2541 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2542   // The min and max sizes match the values in globals.hpp, but scaled
2543   // with K. The values have been chosen so that alignment with page
2544   // size doesn't change the max value, which makes the conversions
2545   // back and forth between Xss value and ThreadStackSize value easier.
2546   // The values have also been chosen to fit inside a 32-bit signed type.
2547   const julong min_ThreadStackSize = 0;
2548   const julong max_ThreadStackSize = 1 * M;
2549 
2550   const julong min_size = min_ThreadStackSize * K;
2551   const julong max_size = max_ThreadStackSize * K;
2552 
2553   assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2554 
2555   julong size = 0;
2556   ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2557   if (errcode != arg_in_range) {
2558     bool silent = (option == NULL); // Allow testing to silence error messages
2559     if (!silent) {
2560       jio_fprintf(defaultStream::error_stream(),
2561                   "Invalid thread stack size: %s\n", option->optionString);
2562       describe_range_error(errcode);
2563     }
2564     return JNI_EINVAL;
2565   }
2566 
2567   // Internally track ThreadStackSize in units of 1024 bytes.
2568   const julong size_aligned = align_up(size, K);
2569   assert(size <= size_aligned,
2570          "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2571          size, size_aligned);
2572 
2573   const julong size_in_K = size_aligned / K;
2574   assert(size_in_K < (julong)max_intx,
2575          "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2576          size_in_K);
2577 
2578   // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2579   const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2580   assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2581          "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2582          max_expanded, size_in_K);
2583 
2584   *out_ThreadStackSize = (intx)size_in_K;
2585 
2586   return JNI_OK;
2587 }
2588 
2589 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2590   // For match_option to return remaining or value part of option string
2591   const char* tail;
2592 
2593   // iterate over arguments
2594   for (int index = 0; index < args->nOptions; index++) {
2595     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2596 
2597     const JavaVMOption* option = args->options + index;
2598 
2599     if (!match_option(option, "-Djava.class.path", &tail) &&
2600         !match_option(option, "-Dsun.java.command", &tail) &&
2601         !match_option(option, "-Dsun.java.launcher", &tail)) {
2602 
2603         // add all jvm options to the jvm_args string. This string
2604         // is used later to set the java.vm.args PerfData string constant.
2605         // the -Djava.class.path and the -Dsun.java.command options are
2606         // omitted from jvm_args string as each have their own PerfData
2607         // string constant object.
2608         build_jvm_args(option->optionString);
2609     }
2610 
2611     // -verbose:[class/module/gc/jni]
2612     if (match_option(option, "-verbose", &tail)) {
2613       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2614         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2615         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2616       } else if (!strcmp(tail, ":module")) {
2617         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2618         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2619       } else if (!strcmp(tail, ":gc")) {
2620         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2621       } else if (!strcmp(tail, ":jni")) {
2622         if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2623           return JNI_EINVAL;
2624         }
2625       }
2626     // -da / -ea / -disableassertions / -enableassertions
2627     // These accept an optional class/package name separated by a colon, e.g.,
2628     // -da:java.lang.Thread.
2629     } else if (match_option(option, user_assertion_options, &tail, true)) {
2630       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2631       if (*tail == '\0') {
2632         JavaAssertions::setUserClassDefault(enable);
2633       } else {
2634         assert(*tail == ':', "bogus match by match_option()");
2635         JavaAssertions::addOption(tail + 1, enable);
2636       }
2637     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2638     } else if (match_option(option, system_assertion_options, &tail, false)) {
2639       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2640       JavaAssertions::setSystemClassDefault(enable);
2641     // -bootclasspath:
2642     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2643         jio_fprintf(defaultStream::output_stream(),
2644           "-Xbootclasspath is no longer a supported option.\n");
2645         return JNI_EINVAL;
2646     // -bootclasspath/a:
2647     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2648       Arguments::append_sysclasspath(tail);
2649     // -bootclasspath/p:
2650     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2651         jio_fprintf(defaultStream::output_stream(),
2652           "-Xbootclasspath/p is no longer a supported option.\n");
2653         return JNI_EINVAL;
2654     // -Xrun
2655     } else if (match_option(option, "-Xrun", &tail)) {
2656       if (tail != NULL) {
2657         const char* pos = strchr(tail, ':');
2658         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2659         char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2660         jio_snprintf(name, len + 1, "%s", tail);
2661 
2662         char *options = NULL;
2663         if(pos != NULL) {
2664           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2665           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2666         }
2667 #if !INCLUDE_JVMTI
2668         if (strcmp(name, "jdwp") == 0) {
2669           jio_fprintf(defaultStream::error_stream(),
2670             "Debugging agents are not supported in this VM\n");
2671           return JNI_ERR;
2672         }
2673 #endif // !INCLUDE_JVMTI
2674         add_init_library(name, options);
2675       }
2676     } else if (match_option(option, "--add-reads=", &tail)) {
2677       if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2678         return JNI_ENOMEM;
2679       }
2680     } else if (match_option(option, "--add-exports=", &tail)) {
2681       if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2682         return JNI_ENOMEM;
2683       }
2684     } else if (match_option(option, "--add-opens=", &tail)) {
2685       if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2686         return JNI_ENOMEM;
2687       }
2688     } else if (match_option(option, "--add-modules=", &tail)) {
2689       if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2690         return JNI_ENOMEM;
2691       }
2692     } else if (match_option(option, "--limit-modules=", &tail)) {
2693       if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2694         return JNI_ENOMEM;
2695       }
2696     } else if (match_option(option, "--module-path=", &tail)) {
2697       if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2698         return JNI_ENOMEM;
2699       }
2700     } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2701       if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2702         return JNI_ENOMEM;
2703       }
2704     } else if (match_option(option, "--patch-module=", &tail)) {
2705       // --patch-module=<module>=<file>(<pathsep><file>)*
2706       int res = process_patch_mod_option(tail, patch_mod_javabase);
2707       if (res != JNI_OK) {
2708         return res;
2709       }
2710     } else if (match_option(option, "--illegal-access=", &tail)) {
2711       if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2712         return JNI_ENOMEM;
2713       }
2714     // -agentlib and -agentpath
2715     } else if (match_option(option, "-agentlib:", &tail) ||
2716           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2717       if(tail != NULL) {
2718         const char* pos = strchr(tail, '=');
2719         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2720         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2721         name[len] = '\0';
2722 
2723         char *options = NULL;
2724         if(pos != NULL) {
2725           options = os::strdup_check_oom(pos + 1, mtArguments);
2726         }
2727 #if !INCLUDE_JVMTI
2728         if (valid_jdwp_agent(name, is_absolute_path)) {
2729           jio_fprintf(defaultStream::error_stream(),
2730             "Debugging agents are not supported in this VM\n");
2731           return JNI_ERR;
2732         }
2733 #endif // !INCLUDE_JVMTI
2734         add_init_agent(name, options, is_absolute_path);
2735       }
2736     // -javaagent
2737     } else if (match_option(option, "-javaagent:", &tail)) {
2738 #if !INCLUDE_JVMTI
2739       jio_fprintf(defaultStream::error_stream(),
2740         "Instrumentation agents are not supported in this VM\n");
2741       return JNI_ERR;
2742 #else
2743       if (tail != NULL) {
2744         size_t length = strlen(tail) + 1;
2745         char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2746         jio_snprintf(options, length, "%s", tail);
2747         add_instrument_agent("instrument", options, false);
2748         // java agents need module java.instrument
2749         if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2750           return JNI_ENOMEM;
2751         }
2752       }
2753 #endif // !INCLUDE_JVMTI
2754     // --enable_preview
2755     } else if (match_option(option, "--enable-preview")) {
2756       set_enable_preview();
2757     // -Xnoclassgc
2758     } else if (match_option(option, "-Xnoclassgc")) {
2759       if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) {
2760         return JNI_EINVAL;
2761       }
2762     // -Xconcgc
2763     } else if (match_option(option, "-Xconcgc")) {
2764       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2765         return JNI_EINVAL;
2766       }
2767       handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2768     // -Xnoconcgc
2769     } else if (match_option(option, "-Xnoconcgc")) {
2770       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2771         return JNI_EINVAL;
2772       }
2773       handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2774     // -Xbatch
2775     } else if (match_option(option, "-Xbatch")) {
2776       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2777         return JNI_EINVAL;
2778       }
2779     // -Xmn for compatibility with other JVM vendors
2780     } else if (match_option(option, "-Xmn", &tail)) {
2781       julong long_initial_young_size = 0;
2782       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2783       if (errcode != arg_in_range) {
2784         jio_fprintf(defaultStream::error_stream(),
2785                     "Invalid initial young generation size: %s\n", option->optionString);
2786         describe_range_error(errcode);
2787         return JNI_EINVAL;
2788       }
2789       if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2790         return JNI_EINVAL;
2791       }
2792       if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2793         return JNI_EINVAL;
2794       }
2795     // -Xms
2796     } else if (match_option(option, "-Xms", &tail)) {
2797       julong long_initial_heap_size = 0;
2798       // an initial heap size of 0 means automatically determine
2799       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2800       if (errcode != arg_in_range) {
2801         jio_fprintf(defaultStream::error_stream(),
2802                     "Invalid initial heap size: %s\n", option->optionString);
2803         describe_range_error(errcode);
2804         return JNI_EINVAL;
2805       }
2806       set_min_heap_size((size_t)long_initial_heap_size);
2807       // Currently the minimum size and the initial heap sizes are the same.
2808       // Can be overridden with -XX:InitialHeapSize.
2809       if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) {
2810         return JNI_EINVAL;
2811       }
2812     // -Xmx
2813     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2814       julong long_max_heap_size = 0;
2815       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2816       if (errcode != arg_in_range) {
2817         jio_fprintf(defaultStream::error_stream(),
2818                     "Invalid maximum heap size: %s\n", option->optionString);
2819         describe_range_error(errcode);
2820         return JNI_EINVAL;
2821       }
2822       if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2823         return JNI_EINVAL;
2824       }
2825     // Xmaxf
2826     } else if (match_option(option, "-Xmaxf", &tail)) {
2827       char* err;
2828       int maxf = (int)(strtod(tail, &err) * 100);
2829       if (*err != '\0' || *tail == '\0') {
2830         jio_fprintf(defaultStream::error_stream(),
2831                     "Bad max heap free percentage size: %s\n",
2832                     option->optionString);
2833         return JNI_EINVAL;
2834       } else {
2835         if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2836             return JNI_EINVAL;
2837         }
2838       }
2839     // Xminf
2840     } else if (match_option(option, "-Xminf", &tail)) {
2841       char* err;
2842       int minf = (int)(strtod(tail, &err) * 100);
2843       if (*err != '\0' || *tail == '\0') {
2844         jio_fprintf(defaultStream::error_stream(),
2845                     "Bad min heap free percentage size: %s\n",
2846                     option->optionString);
2847         return JNI_EINVAL;
2848       } else {
2849         if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2850           return JNI_EINVAL;
2851         }
2852       }
2853     // -Xss
2854     } else if (match_option(option, "-Xss", &tail)) {
2855       intx value = 0;
2856       jint err = parse_xss(option, tail, &value);
2857       if (err != JNI_OK) {
2858         return err;
2859       }
2860       if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) {
2861         return JNI_EINVAL;
2862       }
2863     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2864                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2865       julong long_ReservedCodeCacheSize = 0;
2866 
2867       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2868       if (errcode != arg_in_range) {
2869         jio_fprintf(defaultStream::error_stream(),
2870                     "Invalid maximum code cache size: %s.\n", option->optionString);
2871         return JNI_EINVAL;
2872       }
2873       if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2874         return JNI_EINVAL;
2875       }
2876     // -green
2877     } else if (match_option(option, "-green")) {
2878       jio_fprintf(defaultStream::error_stream(),
2879                   "Green threads support not available\n");
2880           return JNI_EINVAL;
2881     // -native
2882     } else if (match_option(option, "-native")) {
2883           // HotSpot always uses native threads, ignore silently for compatibility
2884     // -Xrs
2885     } else if (match_option(option, "-Xrs")) {
2886           // Classic/EVM option, new functionality
2887       if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2888         return JNI_EINVAL;
2889       }
2890       // -Xprof
2891     } else if (match_option(option, "-Xprof")) {
2892       char version[256];
2893       // Obsolete in JDK 10
2894       JDK_Version::jdk(10).to_string(version, sizeof(version));
2895       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2896     // -Xconcurrentio
2897     } else if (match_option(option, "-Xconcurrentio")) {
2898       if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != JVMFlag::SUCCESS) {
2899         return JNI_EINVAL;
2900       }
2901       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2902         return JNI_EINVAL;
2903       }
2904       SafepointSynchronize::set_defer_thr_suspend_loop_count();
2905       if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != JVMFlag::SUCCESS) {
2906         return JNI_EINVAL;
2907       }
2908       if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != JVMFlag::SUCCESS) {  // 20Kb per thread added to new generation
2909         return JNI_EINVAL;
2910       }
2911 
2912       // -Xinternalversion
2913     } else if (match_option(option, "-Xinternalversion")) {
2914       jio_fprintf(defaultStream::output_stream(), "%s\n",
2915                   VM_Version::internal_vm_info_string());
2916       vm_exit(0);
2917 #ifndef PRODUCT
2918     // -Xprintflags
2919     } else if (match_option(option, "-Xprintflags")) {
2920       JVMFlag::printFlags(tty, false);
2921       vm_exit(0);
2922 #endif
2923     // -D
2924     } else if (match_option(option, "-D", &tail)) {
2925       const char* value;
2926       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2927             *value!= '\0' && strcmp(value, "\"\"") != 0) {
2928         // abort if -Djava.endorsed.dirs is set
2929         jio_fprintf(defaultStream::output_stream(),
2930           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2931           "in modular form will be supported via the concept of upgradeable modules.\n", value);
2932         return JNI_EINVAL;
2933       }
2934       if (match_option(option, "-Djava.ext.dirs=", &value) &&
2935             *value != '\0' && strcmp(value, "\"\"") != 0) {
2936         // abort if -Djava.ext.dirs is set
2937         jio_fprintf(defaultStream::output_stream(),
2938           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
2939         return JNI_EINVAL;
2940       }
2941       // Check for module related properties.  They must be set using the modules
2942       // options. For example: use "--add-modules=java.sql", not
2943       // "-Djdk.module.addmods=java.sql"
2944       if (is_internal_module_property(option->optionString + 2)) {
2945         needs_module_property_warning = true;
2946         continue;
2947       }
2948 
2949       if (!add_property(tail)) {
2950         return JNI_ENOMEM;
2951       }
2952       // Out of the box management support
2953       if (match_option(option, "-Dcom.sun.management", &tail)) {
2954 #if INCLUDE_MANAGEMENT
2955         if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) {
2956           return JNI_EINVAL;
2957         }
2958         // management agent in module jdk.management.agent
2959         if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2960           return JNI_ENOMEM;
2961         }
2962 #else
2963         jio_fprintf(defaultStream::output_stream(),
2964           "-Dcom.sun.management is not supported in this VM.\n");
2965         return JNI_ERR;
2966 #endif
2967       }
2968     // -Xint
2969     } else if (match_option(option, "-Xint")) {
2970           set_mode_flags(_int);
2971     // -Xmixed
2972     } else if (match_option(option, "-Xmixed")) {
2973           set_mode_flags(_mixed);
2974     // -Xcomp
2975     } else if (match_option(option, "-Xcomp")) {
2976       // for testing the compiler; turn off all flags that inhibit compilation
2977           set_mode_flags(_comp);
2978     // -Xshare:dump
2979     } else if (match_option(option, "-Xshare:dump")) {
2980       if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2981         return JNI_EINVAL;
2982       }
2983       set_mode_flags(_int);     // Prevent compilation, which creates objects
2984     // -Xshare:on
2985     } else if (match_option(option, "-Xshare:on")) {
2986       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2987         return JNI_EINVAL;
2988       }
2989       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2990         return JNI_EINVAL;
2991       }
2992     // -Xshare:auto
2993     } else if (match_option(option, "-Xshare:auto")) {
2994       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2995         return JNI_EINVAL;
2996       }
2997       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2998         return JNI_EINVAL;
2999       }
3000     // -Xshare:off
3001     } else if (match_option(option, "-Xshare:off")) {
3002       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) {
3003         return JNI_EINVAL;
3004       }
3005       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
3006         return JNI_EINVAL;
3007       }
3008     // -Xverify
3009     } else if (match_option(option, "-Xverify", &tail)) {
3010       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3011         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
3012           return JNI_EINVAL;
3013         }
3014         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
3015           return JNI_EINVAL;
3016         }
3017       } else if (strcmp(tail, ":remote") == 0) {
3018         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
3019           return JNI_EINVAL;
3020         }
3021         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
3022           return JNI_EINVAL;
3023         }
3024       } else if (strcmp(tail, ":none") == 0) {
3025         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
3026           return JNI_EINVAL;
3027         }
3028         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
3029           return JNI_EINVAL;
3030         }
3031       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3032         return JNI_EINVAL;
3033       }
3034     // -Xdebug
3035     } else if (match_option(option, "-Xdebug")) {
3036       // note this flag has been used, then ignore
3037       set_xdebug_mode(true);
3038     // -Xnoagent
3039     } else if (match_option(option, "-Xnoagent")) {
3040       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3041     } else if (match_option(option, "-Xloggc:", &tail)) {
3042       // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3043       log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3044       _gc_log_filename = os::strdup_check_oom(tail);
3045     } else if (match_option(option, "-Xlog", &tail)) {
3046       bool ret = false;
3047       if (strcmp(tail, ":help") == 0) {
3048         fileStream stream(defaultStream::output_stream());
3049         LogConfiguration::print_command_line_help(&stream);
3050         vm_exit(0);
3051       } else if (strcmp(tail, ":disable") == 0) {
3052         LogConfiguration::disable_logging();
3053         ret = true;
3054       } else if (*tail == '\0') {
3055         ret = LogConfiguration::parse_command_line_arguments();
3056         assert(ret, "-Xlog without arguments should never fail to parse");
3057       } else if (*tail == ':') {
3058         ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3059       }
3060       if (ret == false) {
3061         jio_fprintf(defaultStream::error_stream(),
3062                     "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
3063                     tail);
3064         return JNI_EINVAL;
3065       }
3066     // JNI hooks
3067     } else if (match_option(option, "-Xcheck", &tail)) {
3068       if (!strcmp(tail, ":jni")) {
3069 #if !INCLUDE_JNI_CHECK
3070         warning("JNI CHECKING is not supported in this VM");
3071 #else
3072         CheckJNICalls = true;
3073 #endif // INCLUDE_JNI_CHECK
3074       } else if (is_bad_option(option, args->ignoreUnrecognized,
3075                                      "check")) {
3076         return JNI_EINVAL;
3077       }
3078     } else if (match_option(option, "vfprintf")) {
3079       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3080     } else if (match_option(option, "exit")) {
3081       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3082     } else if (match_option(option, "abort")) {
3083       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3084     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3085     // and the last option wins.
3086     } else if (match_option(option, "-XX:+NeverTenure")) {
3087       if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) {
3088         return JNI_EINVAL;
3089       }
3090       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
3091         return JNI_EINVAL;
3092       }
3093       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
3094         return JNI_EINVAL;
3095       }
3096     } else if (match_option(option, "-XX:+AlwaysTenure")) {
3097       if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
3098         return JNI_EINVAL;
3099       }
3100       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
3101         return JNI_EINVAL;
3102       }
3103       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
3104         return JNI_EINVAL;
3105       }
3106     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3107       uintx max_tenuring_thresh = 0;
3108       if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3109         jio_fprintf(defaultStream::error_stream(),
3110                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3111         return JNI_EINVAL;
3112       }
3113 
3114       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
3115         return JNI_EINVAL;
3116       }
3117 
3118       if (MaxTenuringThreshold == 0) {
3119         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
3120           return JNI_EINVAL;
3121         }
3122         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) {
3123           return JNI_EINVAL;
3124         }
3125       } else {
3126         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) {
3127           return JNI_EINVAL;
3128         }
3129         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) {
3130           return JNI_EINVAL;
3131         }
3132       }
3133     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3134       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
3135         return JNI_EINVAL;
3136       }
3137       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
3138         return JNI_EINVAL;
3139       }
3140     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3141       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
3142         return JNI_EINVAL;
3143       }
3144       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
3145         return JNI_EINVAL;
3146       }
3147     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3148 #if defined(DTRACE_ENABLED)
3149       if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
3150         return JNI_EINVAL;
3151       }
3152       if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
3153         return JNI_EINVAL;
3154       }
3155       if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
3156         return JNI_EINVAL;
3157       }
3158       if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
3159         return JNI_EINVAL;
3160       }
3161 #else // defined(DTRACE_ENABLED)
3162       jio_fprintf(defaultStream::error_stream(),
3163                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3164       return JNI_EINVAL;
3165 #endif // defined(DTRACE_ENABLED)
3166 #ifdef ASSERT
3167     } else if (match_option(option, "-XX:+FullGCALot")) {
3168       if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) {
3169         return JNI_EINVAL;
3170       }
3171       // disable scavenge before parallel mark-compact
3172       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
3173         return JNI_EINVAL;
3174       }
3175 #endif
3176 #if !INCLUDE_MANAGEMENT
3177     } else if (match_option(option, "-XX:+ManagementServer")) {
3178         jio_fprintf(defaultStream::error_stream(),
3179           "ManagementServer is not supported in this VM.\n");
3180         return JNI_ERR;
3181 #endif // INCLUDE_MANAGEMENT
3182 #if INCLUDE_JFR
3183     } else if (match_jfr_option(&option)) {
3184       return JNI_EINVAL;
3185 #endif
3186     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3187       // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3188       // already been handled
3189       if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3190           (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3191         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3192           return JNI_EINVAL;
3193         }
3194       }
3195     // Unknown option
3196     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3197       return JNI_ERR;
3198     }
3199   }
3200 
3201   // PrintSharedArchiveAndExit will turn on
3202   //   -Xshare:on
3203   //   -Xlog:class+path=info
3204   if (PrintSharedArchiveAndExit) {
3205     if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3206       return JNI_EINVAL;
3207     }
3208     if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3209       return JNI_EINVAL;
3210     }
3211     LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3212   }
3213 
3214   // Change the default value for flags  which have different default values
3215   // when working with older JDKs.
3216 #ifdef LINUX
3217  if (JDK_Version::current().compare_major(6) <= 0 &&
3218       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3219     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3220   }
3221 #endif // LINUX
3222   fix_appclasspath();
3223   return JNI_OK;
3224 }
3225 
3226 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3227   // For java.base check for duplicate --patch-module options being specified on the command line.
3228   // This check is only required for java.base, all other duplicate module specifications
3229   // will be checked during module system initialization.  The module system initialization
3230   // will throw an ExceptionInInitializerError if this situation occurs.
3231   if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3232     if (*patch_mod_javabase) {
3233       vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3234     } else {
3235       *patch_mod_javabase = true;
3236     }
3237   }
3238 
3239   // Create GrowableArray lazily, only if --patch-module has been specified
3240   if (_patch_mod_prefix == NULL) {
3241     _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3242   }
3243 
3244   _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3245 }
3246 
3247 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3248 //
3249 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3250 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3251 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3252 // path is treated as the current directory.
3253 //
3254 // This causes problems with CDS, which requires that all directories specified in the classpath
3255 // must be empty. In most cases, applications do NOT want to load classes from the current
3256 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3257 // scripts compatible with CDS.
3258 void Arguments::fix_appclasspath() {
3259   if (IgnoreEmptyClassPaths) {
3260     const char separator = *os::path_separator();
3261     const char* src = _java_class_path->value();
3262 
3263     // skip over all the leading empty paths
3264     while (*src == separator) {
3265       src ++;
3266     }
3267 
3268     char* copy = os::strdup_check_oom(src, mtArguments);
3269 
3270     // trim all trailing empty paths
3271     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3272       *tail = '\0';
3273     }
3274 
3275     char from[3] = {separator, separator, '\0'};
3276     char to  [2] = {separator, '\0'};
3277     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3278       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3279       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3280     }
3281 
3282     _java_class_path->set_writeable_value(copy);
3283     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3284   }
3285 }
3286 
3287 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3288   // check if the default lib/endorsed directory exists; if so, error
3289   char path[JVM_MAXPATHLEN];
3290   const char* fileSep = os::file_separator();
3291   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3292 
3293   DIR* dir = os::opendir(path);
3294   if (dir != NULL) {
3295     jio_fprintf(defaultStream::output_stream(),
3296       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3297       "in modular form will be supported via the concept of upgradeable modules.\n");
3298     os::closedir(dir);
3299     return JNI_ERR;
3300   }
3301 
3302   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3303   dir = os::opendir(path);
3304   if (dir != NULL) {
3305     jio_fprintf(defaultStream::output_stream(),
3306       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3307       "Use -classpath instead.\n.");
3308     os::closedir(dir);
3309     return JNI_ERR;
3310   }
3311 
3312   // This must be done after all arguments have been processed
3313   // and the container support has been initialized since AggressiveHeap
3314   // relies on the amount of total memory available.
3315   if (AggressiveHeap) {
3316     jint result = set_aggressive_heap_flags();
3317     if (result != JNI_OK) {
3318       return result;
3319     }
3320   }
3321 
3322   // This must be done after all arguments have been processed.
3323   // java_compiler() true means set to "NONE" or empty.
3324   if (java_compiler() && !xdebug_mode()) {
3325     // For backwards compatibility, we switch to interpreted mode if
3326     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3327     // not specified.
3328     set_mode_flags(_int);
3329   }
3330 
3331   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3332   // but like -Xint, leave compilation thresholds unaffected.
3333   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3334   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3335     set_mode_flags(_int);
3336   }
3337 
3338   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3339   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3340     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3341   }
3342 
3343 #if !COMPILER2_OR_JVMCI
3344   // Don't degrade server performance for footprint
3345   if (FLAG_IS_DEFAULT(UseLargePages) &&
3346       MaxHeapSize < LargePageHeapSizeThreshold) {
3347     // No need for large granularity pages w/small heaps.
3348     // Note that large pages are enabled/disabled for both the
3349     // Java heap and the code cache.
3350     FLAG_SET_DEFAULT(UseLargePages, false);
3351   }
3352 
3353 #elif defined(COMPILER2)
3354   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3355     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3356   }
3357 #endif
3358 
3359 #if !COMPILER2_OR_JVMCI
3360   UNSUPPORTED_OPTION(ProfileInterpreter);
3361   NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3362 #endif
3363 
3364 #ifndef TIERED
3365   // Tiered compilation is undefined.
3366   UNSUPPORTED_OPTION(TieredCompilation);
3367 #endif
3368 
3369   if (!check_vm_args_consistency()) {
3370     return JNI_ERR;
3371   }
3372 
3373 #if INCLUDE_JVMCI
3374   if (EnableJVMCI &&
3375       !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3376     return JNI_ENOMEM;
3377   }
3378 #endif
3379 
3380 #if INCLUDE_JVMCI
3381   if (UseJVMCICompiler) {
3382     Compilation_mode = CompMode_server;
3383   }
3384 #endif
3385 
3386 #if INCLUDE_CDS
3387   if (DumpSharedSpaces) {
3388     // Disable biased locking now as it interferes with the clean up of
3389     // the archived Klasses and Java string objects (at dump time only).
3390     UseBiasedLocking = false;
3391 
3392     // Always verify non-system classes during CDS dump
3393     if (!BytecodeVerificationRemote) {
3394       BytecodeVerificationRemote = true;
3395       log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3396     }
3397   }
3398   if (UseSharedSpaces && patch_mod_javabase) {
3399     no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3400   }
3401   if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3402     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3403   }
3404 #endif
3405 
3406 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3407   UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3408 #endif // CAN_SHOW_REGISTERS_ON_ASSERT
3409 
3410   return JNI_OK;
3411 }
3412 
3413 // Helper class for controlling the lifetime of JavaVMInitArgs
3414 // objects.  The contents of the JavaVMInitArgs are guaranteed to be
3415 // deleted on the destruction of the ScopedVMInitArgs object.
3416 class ScopedVMInitArgs : public StackObj {
3417  private:
3418   JavaVMInitArgs _args;
3419   char*          _container_name;
3420   bool           _is_set;
3421   char*          _vm_options_file_arg;
3422 
3423  public:
3424   ScopedVMInitArgs(const char *container_name) {
3425     _args.version = JNI_VERSION_1_2;
3426     _args.nOptions = 0;
3427     _args.options = NULL;
3428     _args.ignoreUnrecognized = false;
3429     _container_name = (char *)container_name;
3430     _is_set = false;
3431     _vm_options_file_arg = NULL;
3432   }
3433 
3434   // Populates the JavaVMInitArgs object represented by this
3435   // ScopedVMInitArgs object with the arguments in options.  The
3436   // allocated memory is deleted by the destructor.  If this method
3437   // returns anything other than JNI_OK, then this object is in a
3438   // partially constructed state, and should be abandoned.
3439   jint set_args(GrowableArray<JavaVMOption>* options) {
3440     _is_set = true;
3441     JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3442         JavaVMOption, options->length(), mtArguments);
3443     if (options_arr == NULL) {
3444       return JNI_ENOMEM;
3445     }
3446     _args.options = options_arr;
3447 
3448     for (int i = 0; i < options->length(); i++) {
3449       options_arr[i] = options->at(i);
3450       options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3451       if (options_arr[i].optionString == NULL) {
3452         // Rely on the destructor to do cleanup.
3453         _args.nOptions = i;
3454         return JNI_ENOMEM;
3455       }
3456     }
3457 
3458     _args.nOptions = options->length();
3459     _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3460     return JNI_OK;
3461   }
3462 
3463   JavaVMInitArgs* get()             { return &_args; }
3464   char* container_name()            { return _container_name; }
3465   bool  is_set()                    { return _is_set; }
3466   bool  found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3467   char* vm_options_file_arg()       { return _vm_options_file_arg; }
3468 
3469   void set_vm_options_file_arg(const char *vm_options_file_arg) {
3470     if (_vm_options_file_arg != NULL) {
3471       os::free(_vm_options_file_arg);
3472     }
3473     _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3474   }
3475 
3476   ~ScopedVMInitArgs() {
3477     if (_vm_options_file_arg != NULL) {
3478       os::free(_vm_options_file_arg);
3479     }
3480     if (_args.options == NULL) return;
3481     for (int i = 0; i < _args.nOptions; i++) {
3482       os::free(_args.options[i].optionString);
3483     }
3484     FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3485   }
3486 
3487   // Insert options into this option list, to replace option at
3488   // vm_options_file_pos (-XX:VMOptionsFile)
3489   jint insert(const JavaVMInitArgs* args,
3490               const JavaVMInitArgs* args_to_insert,
3491               const int vm_options_file_pos) {
3492     assert(_args.options == NULL, "shouldn't be set yet");
3493     assert(args_to_insert->nOptions != 0, "there should be args to insert");
3494     assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3495 
3496     int length = args->nOptions + args_to_insert->nOptions - 1;
3497     GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3498               GrowableArray<JavaVMOption>(length, true);    // Construct new option array
3499     for (int i = 0; i < args->nOptions; i++) {
3500       if (i == vm_options_file_pos) {
3501         // insert the new options starting at the same place as the
3502         // -XX:VMOptionsFile option
3503         for (int j = 0; j < args_to_insert->nOptions; j++) {
3504           options->push(args_to_insert->options[j]);
3505         }
3506       } else {
3507         options->push(args->options[i]);
3508       }
3509     }
3510     // make into options array
3511     jint result = set_args(options);
3512     delete options;
3513     return result;
3514   }
3515 };
3516 
3517 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3518   return parse_options_environment_variable("_JAVA_OPTIONS", args);
3519 }
3520 
3521 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3522   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3523 }
3524 
3525 jint Arguments::parse_options_environment_variable(const char* name,
3526                                                    ScopedVMInitArgs* vm_args) {
3527   char *buffer = ::getenv(name);
3528 
3529   // Don't check this environment variable if user has special privileges
3530   // (e.g. unix su command).
3531   if (buffer == NULL || os::have_special_privileges()) {
3532     return JNI_OK;
3533   }
3534 
3535   if ((buffer = os::strdup(buffer)) == NULL) {
3536     return JNI_ENOMEM;
3537   }
3538 
3539   jio_fprintf(defaultStream::error_stream(),
3540               "Picked up %s: %s\n", name, buffer);
3541 
3542   int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3543 
3544   os::free(buffer);
3545   return retcode;
3546 }
3547 
3548 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3549   // read file into buffer
3550   int fd = ::open(file_name, O_RDONLY);
3551   if (fd < 0) {
3552     jio_fprintf(defaultStream::error_stream(),
3553                 "Could not open options file '%s'\n",
3554                 file_name);
3555     return JNI_ERR;
3556   }
3557 
3558   struct stat stbuf;
3559   int retcode = os::stat(file_name, &stbuf);
3560   if (retcode != 0) {
3561     jio_fprintf(defaultStream::error_stream(),
3562                 "Could not stat options file '%s'\n",
3563                 file_name);
3564     os::close(fd);
3565     return JNI_ERR;
3566   }
3567 
3568   if (stbuf.st_size == 0) {
3569     // tell caller there is no option data and that is ok
3570     os::close(fd);
3571     return JNI_OK;
3572   }
3573 
3574   // '+ 1' for NULL termination even with max bytes
3575   size_t bytes_alloc = stbuf.st_size + 1;
3576 
3577   char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3578   if (NULL == buf) {
3579     jio_fprintf(defaultStream::error_stream(),
3580                 "Could not allocate read buffer for options file parse\n");
3581     os::close(fd);
3582     return JNI_ENOMEM;
3583   }
3584 
3585   memset(buf, 0, bytes_alloc);
3586 
3587   // Fill buffer
3588   // Use ::read() instead of os::read because os::read()
3589   // might do a thread state transition
3590   // and it is too early for that here
3591 
3592   ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3593   os::close(fd);
3594   if (bytes_read < 0) {
3595     FREE_C_HEAP_ARRAY(char, buf);
3596     jio_fprintf(defaultStream::error_stream(),
3597                 "Could not read options file '%s'\n", file_name);
3598     return JNI_ERR;
3599   }
3600 
3601   if (bytes_read == 0) {
3602     // tell caller there is no option data and that is ok
3603     FREE_C_HEAP_ARRAY(char, buf);
3604     return JNI_OK;
3605   }
3606 
3607   retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3608 
3609   FREE_C_HEAP_ARRAY(char, buf);
3610   return retcode;
3611 }
3612 
3613 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3614   GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true);    // Construct option array
3615 
3616   // some pointers to help with parsing
3617   char *buffer_end = buffer + buf_len;
3618   char *opt_hd = buffer;
3619   char *wrt = buffer;
3620   char *rd = buffer;
3621 
3622   // parse all options
3623   while (rd < buffer_end) {
3624     // skip leading white space from the input string
3625     while (rd < buffer_end && isspace(*rd)) {
3626       rd++;
3627     }
3628 
3629     if (rd >= buffer_end) {
3630       break;
3631     }
3632 
3633     // Remember this is where we found the head of the token.
3634     opt_hd = wrt;
3635 
3636     // Tokens are strings of non white space characters separated
3637     // by one or more white spaces.
3638     while (rd < buffer_end && !isspace(*rd)) {
3639       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3640         int quote = *rd;                    // matching quote to look for
3641         rd++;                               // don't copy open quote
3642         while (rd < buffer_end && *rd != quote) {
3643                                             // include everything (even spaces)
3644                                             // up until the close quote
3645           *wrt++ = *rd++;                   // copy to option string
3646         }
3647 
3648         if (rd < buffer_end) {
3649           rd++;                             // don't copy close quote
3650         } else {
3651                                             // did not see closing quote
3652           jio_fprintf(defaultStream::error_stream(),
3653                       "Unmatched quote in %s\n", name);
3654           delete options;
3655           return JNI_ERR;
3656         }
3657       } else {
3658         *wrt++ = *rd++;                     // copy to option string
3659       }
3660     }
3661 
3662     // steal a white space character and set it to NULL
3663     *wrt++ = '\0';
3664     // We now have a complete token
3665 
3666     JavaVMOption option;
3667     option.optionString = opt_hd;
3668     option.extraInfo = NULL;
3669 
3670     options->append(option);                // Fill in option
3671 
3672     rd++;  // Advance to next character
3673   }
3674 
3675   // Fill out JavaVMInitArgs structure.
3676   jint status = vm_args->set_args(options);
3677 
3678   delete options;
3679   return status;
3680 }
3681 
3682 void Arguments::set_shared_spaces_flags() {
3683   if (DumpSharedSpaces) {
3684     if (FailOverToOldVerifier) {
3685       // Don't fall back to the old verifier on verification failure. If a
3686       // class fails verification with the split verifier, it might fail the
3687       // CDS runtime verifier constraint check. In that case, we don't want
3688       // to share the class. We only archive classes that pass the split verifier.
3689       FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3690     }
3691 
3692     if (RequireSharedSpaces) {
3693       warning("Cannot dump shared archive while using shared archive");
3694     }
3695     UseSharedSpaces = false;
3696 #ifdef _LP64
3697     if (!UseCompressedOops || !UseCompressedClassPointers) {
3698       vm_exit_during_initialization(
3699         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3700     }
3701   } else {
3702     if (!UseCompressedOops || !UseCompressedClassPointers) {
3703       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3704     }
3705 #endif
3706   }
3707 }
3708 
3709 // Sharing support
3710 // Construct the path to the archive
3711 static char* get_shared_archive_path() {
3712   char *shared_archive_path;
3713   if (SharedArchiveFile == NULL) {
3714     char jvm_path[JVM_MAXPATHLEN];
3715     os::jvm_path(jvm_path, sizeof(jvm_path));
3716     char *end = strrchr(jvm_path, *os::file_separator());
3717     if (end != NULL) *end = '\0';
3718     size_t jvm_path_len = strlen(jvm_path);
3719     size_t file_sep_len = strlen(os::file_separator());
3720     const size_t len = jvm_path_len + file_sep_len + 20;
3721     shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3722     if (shared_archive_path != NULL) {
3723       jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3724         jvm_path, os::file_separator());
3725     }
3726   } else {
3727     shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3728   }
3729   return shared_archive_path;
3730 }
3731 
3732 #ifndef PRODUCT
3733 // Determine whether LogVMOutput should be implicitly turned on.
3734 static bool use_vm_log() {
3735   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3736       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3737       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3738       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3739       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3740     return true;
3741   }
3742 
3743 #ifdef COMPILER1
3744   if (PrintC1Statistics) {
3745     return true;
3746   }
3747 #endif // COMPILER1
3748 
3749 #ifdef COMPILER2
3750   if (PrintOptoAssembly || PrintOptoStatistics) {
3751     return true;
3752   }
3753 #endif // COMPILER2
3754 
3755   return false;
3756 }
3757 
3758 #endif // PRODUCT
3759 
3760 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3761   for (int index = 0; index < args->nOptions; index++) {
3762     const JavaVMOption* option = args->options + index;
3763     const char* tail;
3764     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3765       return true;
3766     }
3767   }
3768   return false;
3769 }
3770 
3771 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3772                                        const char* vm_options_file,
3773                                        const int vm_options_file_pos,
3774                                        ScopedVMInitArgs* vm_options_file_args,
3775                                        ScopedVMInitArgs* args_out) {
3776   jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3777   if (code != JNI_OK) {
3778     return code;
3779   }
3780 
3781   if (vm_options_file_args->get()->nOptions < 1) {
3782     return JNI_OK;
3783   }
3784 
3785   if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3786     jio_fprintf(defaultStream::error_stream(),
3787                 "A VM options file may not refer to a VM options file. "
3788                 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3789                 "options file '%s' in options container '%s' is an error.\n",
3790                 vm_options_file_args->vm_options_file_arg(),
3791                 vm_options_file_args->container_name());
3792     return JNI_EINVAL;
3793   }
3794 
3795   return args_out->insert(args, vm_options_file_args->get(),
3796                           vm_options_file_pos);
3797 }
3798 
3799 // Expand -XX:VMOptionsFile found in args_in as needed.
3800 // mod_args and args_out parameters may return values as needed.
3801 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3802                                             ScopedVMInitArgs* mod_args,
3803                                             JavaVMInitArgs** args_out) {
3804   jint code = match_special_option_and_act(args_in, mod_args);
3805   if (code != JNI_OK) {
3806     return code;
3807   }
3808 
3809   if (mod_args->is_set()) {
3810     // args_in contains -XX:VMOptionsFile and mod_args contains the
3811     // original options from args_in along with the options expanded
3812     // from the VMOptionsFile. Return a short-hand to the caller.
3813     *args_out = mod_args->get();
3814   } else {
3815     *args_out = (JavaVMInitArgs *)args_in;  // no changes so use args_in
3816   }
3817   return JNI_OK;
3818 }
3819 
3820 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3821                                              ScopedVMInitArgs* args_out) {
3822   // Remaining part of option string
3823   const char* tail;
3824   ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3825 
3826   for (int index = 0; index < args->nOptions; index++) {
3827     const JavaVMOption* option = args->options + index;
3828     if (ArgumentsExt::process_options(option)) {
3829       continue;
3830     }
3831     if (match_option(option, "-XX:Flags=", &tail)) {
3832       Arguments::set_jvm_flags_file(tail);
3833       continue;
3834     }
3835     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3836       if (vm_options_file_args.found_vm_options_file_arg()) {
3837         jio_fprintf(defaultStream::error_stream(),
3838                     "The option '%s' is already specified in the options "
3839                     "container '%s' so the specification of '%s' in the "
3840                     "same options container is an error.\n",
3841                     vm_options_file_args.vm_options_file_arg(),
3842                     vm_options_file_args.container_name(),
3843                     option->optionString);
3844         return JNI_EINVAL;
3845       }
3846       vm_options_file_args.set_vm_options_file_arg(option->optionString);
3847       // If there's a VMOptionsFile, parse that
3848       jint code = insert_vm_options_file(args, tail, index,
3849                                          &vm_options_file_args, args_out);
3850       if (code != JNI_OK) {
3851         return code;
3852       }
3853       args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3854       if (args_out->is_set()) {
3855         // The VMOptions file inserted some options so switch 'args'
3856         // to the new set of options, and continue processing which
3857         // preserves "last option wins" semantics.
3858         args = args_out->get();
3859         // The first option from the VMOptionsFile replaces the
3860         // current option.  So we back track to process the
3861         // replacement option.
3862         index--;
3863       }
3864       continue;
3865     }
3866     if (match_option(option, "-XX:+PrintVMOptions")) {
3867       PrintVMOptions = true;
3868       continue;
3869     }
3870     if (match_option(option, "-XX:-PrintVMOptions")) {
3871       PrintVMOptions = false;
3872       continue;
3873     }
3874     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3875       IgnoreUnrecognizedVMOptions = true;
3876       continue;
3877     }
3878     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3879       IgnoreUnrecognizedVMOptions = false;
3880       continue;
3881     }
3882     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3883       JVMFlag::printFlags(tty, false);
3884       vm_exit(0);
3885     }
3886     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3887 #if INCLUDE_NMT
3888       // The launcher did not setup nmt environment variable properly.
3889       if (!MemTracker::check_launcher_nmt_support(tail)) {
3890         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3891       }
3892 
3893       // Verify if nmt option is valid.
3894       if (MemTracker::verify_nmt_option()) {
3895         // Late initialization, still in single-threaded mode.
3896         if (MemTracker::tracking_level() >= NMT_summary) {
3897           MemTracker::init();
3898         }
3899       } else {
3900         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3901       }
3902       continue;
3903 #else
3904       jio_fprintf(defaultStream::error_stream(),
3905         "Native Memory Tracking is not supported in this VM\n");
3906       return JNI_ERR;
3907 #endif
3908     }
3909 
3910 #ifndef PRODUCT
3911     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3912       JVMFlag::printFlags(tty, true);
3913       vm_exit(0);
3914     }
3915 #endif
3916   }
3917   return JNI_OK;
3918 }
3919 
3920 static void print_options(const JavaVMInitArgs *args) {
3921   const char* tail;
3922   for (int index = 0; index < args->nOptions; index++) {
3923     const JavaVMOption *option = args->options + index;
3924     if (match_option(option, "-XX:", &tail)) {
3925       logOption(tail);
3926     }
3927   }
3928 }
3929 
3930 bool Arguments::handle_deprecated_print_gc_flags() {
3931   if (PrintGC) {
3932     log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3933   }
3934   if (PrintGCDetails) {
3935     log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3936   }
3937 
3938   if (_gc_log_filename != NULL) {
3939     // -Xloggc was used to specify a filename
3940     const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3941 
3942     LogTarget(Error, logging) target;
3943     LogStream errstream(target);
3944     return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3945   } else if (PrintGC || PrintGCDetails) {
3946     LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3947   }
3948   return true;
3949 }
3950 
3951 void Arguments::handle_extra_cms_flags(const char* msg) {
3952   SpecialFlag flag;
3953   const char *flag_name = "UseConcMarkSweepGC";
3954   if (lookup_special_flag(flag_name, flag)) {
3955     handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3956     warning("%s", msg);
3957   }
3958 }
3959 
3960 // Parse entry point called from JNI_CreateJavaVM
3961 
3962 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3963   assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3964 
3965   // Initialize ranges, constraints and writeables
3966   JVMFlagRangeList::init();
3967   JVMFlagConstraintList::init();
3968   JVMFlagWriteableList::init();
3969 
3970   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3971   const char* hotspotrc = ".hotspotrc";
3972   bool settings_file_specified = false;
3973   bool needs_hotspotrc_warning = false;
3974   ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3975   ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3976 
3977   // Pointers to current working set of containers
3978   JavaVMInitArgs* cur_cmd_args;
3979   JavaVMInitArgs* cur_java_options_args;
3980   JavaVMInitArgs* cur_java_tool_options_args;
3981 
3982   // Containers for modified/expanded options
3983   ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3984   ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3985   ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3986 
3987 
3988   jint code =
3989       parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3990   if (code != JNI_OK) {
3991     return code;
3992   }
3993 
3994   code = parse_java_options_environment_variable(&initial_java_options_args);
3995   if (code != JNI_OK) {
3996     return code;
3997   }
3998 
3999   code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4000                                      &mod_java_tool_options_args,
4001                                      &cur_java_tool_options_args);
4002   if (code != JNI_OK) {
4003     return code;
4004   }
4005 
4006   code = expand_vm_options_as_needed(initial_cmd_args,
4007                                      &mod_cmd_args,
4008                                      &cur_cmd_args);
4009   if (code != JNI_OK) {
4010     return code;
4011   }
4012 
4013   code = expand_vm_options_as_needed(initial_java_options_args.get(),
4014                                      &mod_java_options_args,
4015                                      &cur_java_options_args);
4016   if (code != JNI_OK) {
4017     return code;
4018   }
4019 
4020   const char* flags_file = Arguments::get_jvm_flags_file();
4021   settings_file_specified = (flags_file != NULL);
4022 
4023   if (IgnoreUnrecognizedVMOptions) {
4024     cur_cmd_args->ignoreUnrecognized = true;
4025     cur_java_tool_options_args->ignoreUnrecognized = true;
4026     cur_java_options_args->ignoreUnrecognized = true;
4027   }
4028 
4029   // Parse specified settings file
4030   if (settings_file_specified) {
4031     if (!process_settings_file(flags_file, true,
4032                                cur_cmd_args->ignoreUnrecognized)) {
4033       return JNI_EINVAL;
4034     }
4035   } else {
4036 #ifdef ASSERT
4037     // Parse default .hotspotrc settings file
4038     if (!process_settings_file(".hotspotrc", false,
4039                                cur_cmd_args->ignoreUnrecognized)) {
4040       return JNI_EINVAL;
4041     }
4042 #else
4043     struct stat buf;
4044     if (os::stat(hotspotrc, &buf) == 0) {
4045       needs_hotspotrc_warning = true;
4046     }
4047 #endif
4048   }
4049 
4050   if (PrintVMOptions) {
4051     print_options(cur_java_tool_options_args);
4052     print_options(cur_cmd_args);
4053     print_options(cur_java_options_args);
4054   }
4055 
4056   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4057   jint result = parse_vm_init_args(cur_java_tool_options_args,
4058                                    cur_java_options_args,
4059                                    cur_cmd_args);
4060 
4061   if (result != JNI_OK) {
4062     return result;
4063   }
4064 
4065   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4066   SharedArchivePath = get_shared_archive_path();
4067   if (SharedArchivePath == NULL) {
4068     return JNI_ENOMEM;
4069   }
4070 
4071   // Set up VerifySharedSpaces
4072   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4073     VerifySharedSpaces = true;
4074   }
4075 
4076   // Delay warning until here so that we've had a chance to process
4077   // the -XX:-PrintWarnings flag
4078   if (needs_hotspotrc_warning) {
4079     warning("%s file is present but has been ignored.  "
4080             "Run with -XX:Flags=%s to load the file.",
4081             hotspotrc, hotspotrc);
4082   }
4083 
4084   if (needs_module_property_warning) {
4085     warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4086             " names that are reserved for internal use.");
4087   }
4088 
4089 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
4090   UNSUPPORTED_OPTION(UseLargePages);
4091 #endif
4092 
4093   ArgumentsExt::report_unsupported_options();
4094 
4095 #ifndef PRODUCT
4096   if (TraceBytecodesAt != 0) {
4097     TraceBytecodes = true;
4098   }
4099   if (CountCompiledCalls) {
4100     if (UseCounterDecay) {
4101       warning("UseCounterDecay disabled because CountCalls is set");
4102       UseCounterDecay = false;
4103     }
4104   }
4105 #endif // PRODUCT
4106 
4107   if (ScavengeRootsInCode == 0) {
4108     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4109       warning("Forcing ScavengeRootsInCode non-zero");
4110     }
4111     ScavengeRootsInCode = 1;
4112   }
4113 
4114   if (!handle_deprecated_print_gc_flags()) {
4115     return JNI_EINVAL;
4116   }
4117 
4118   // Set object alignment values.
4119   set_object_alignment();
4120 
4121 #if !INCLUDE_CDS
4122   if (DumpSharedSpaces || RequireSharedSpaces) {
4123     jio_fprintf(defaultStream::error_stream(),
4124       "Shared spaces are not supported in this VM\n");
4125     return JNI_ERR;
4126   }
4127   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4128       log_is_enabled(Info, cds)) {
4129     warning("Shared spaces are not supported in this VM");
4130     FLAG_SET_DEFAULT(UseSharedSpaces, false);
4131     LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4132   }
4133   no_shared_spaces("CDS Disabled");
4134 #endif // INCLUDE_CDS
4135 
4136   return JNI_OK;
4137 }
4138 
4139 jint Arguments::apply_ergo() {
4140   // Set flags based on ergonomics.
4141   jint result = set_ergonomics_flags();
4142   if (result != JNI_OK) return result;
4143 
4144 #if INCLUDE_JVMCI
4145   set_jvmci_specific_flags();
4146 #endif
4147 
4148   set_shared_spaces_flags();
4149 
4150   if (TieredCompilation) {
4151     set_tiered_flags();
4152   } else {
4153     int max_compilation_policy_choice = 1;
4154 #ifdef COMPILER2
4155     if (is_server_compilation_mode_vm()) {
4156       max_compilation_policy_choice = 2;
4157     }
4158 #endif
4159     // Check if the policy is valid.
4160     if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4161       vm_exit_during_initialization(
4162         "Incompatible compilation policy selected", NULL);
4163     }
4164     // Scale CompileThreshold
4165     // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4166     if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4167       FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4168     }
4169   }
4170 
4171 #ifdef COMPILER2
4172 #ifndef PRODUCT
4173   if (PrintIdealGraphLevel > 0) {
4174     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4175   }
4176 #endif
4177 #endif
4178 
4179   // Set heap size based on available physical memory
4180   set_heap_size();
4181 
4182   GCConfig::arguments()->initialize();
4183 
4184   // Initialize Metaspace flags and alignments
4185   Metaspace::ergo_initialize();
4186 
4187   // Set bytecode rewriting flags
4188   set_bytecode_flags();
4189 
4190   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4191   jint code = set_aggressive_opts_flags();
4192   if (code != JNI_OK) {
4193     return code;
4194   }
4195 
4196   // Turn off biased locking for locking debug mode flags,
4197   // which are subtly different from each other but neither works with
4198   // biased locking
4199   if (UseHeavyMonitors
4200 #ifdef COMPILER1
4201       || !UseFastLocking
4202 #endif // COMPILER1
4203 #if INCLUDE_JVMCI
4204       || !JVMCIUseFastLocking
4205 #endif
4206     ) {
4207     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4208       // flag set to true on command line; warn the user that they
4209       // can't enable biased locking here
4210       warning("Biased Locking is not supported with locking debug flags"
4211               "; ignoring UseBiasedLocking flag." );
4212     }
4213     UseBiasedLocking = false;
4214   }
4215 
4216 #ifdef CC_INTERP
4217   // Clear flags not supported on zero.
4218   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4219   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4220   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4221   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4222 #endif // CC_INTERP
4223 
4224 #ifdef COMPILER2
4225   if (!EliminateLocks) {
4226     EliminateNestedLocks = false;
4227   }
4228   if (!Inline) {
4229     IncrementalInline = false;
4230   }
4231 #ifndef PRODUCT
4232   if (!IncrementalInline) {
4233     AlwaysIncrementalInline = false;
4234   }
4235 #endif
4236   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4237     // nothing to use the profiling, turn if off
4238     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4239   }
4240   if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
4241     // blind guess
4242     LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
4243   }
4244 #endif
4245 
4246   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4247     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4248     DebugNonSafepoints = true;
4249   }
4250 
4251   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4252     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4253   }
4254 
4255   if (UseOnStackReplacement && !UseLoopCounter) {
4256     warning("On-stack-replacement requires loop counters; enabling loop counters");
4257     FLAG_SET_DEFAULT(UseLoopCounter, true);
4258   }
4259 
4260 #ifndef PRODUCT
4261   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4262     if (use_vm_log()) {
4263       LogVMOutput = true;
4264     }
4265   }
4266 #endif // PRODUCT
4267 
4268   if (PrintCommandLineFlags) {
4269     JVMFlag::printSetFlags(tty);
4270   }
4271 
4272   // Apply CPU specific policy for the BiasedLocking
4273   if (UseBiasedLocking) {
4274     if (!VM_Version::use_biased_locking() &&
4275         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4276       UseBiasedLocking = false;
4277     }
4278   }
4279 #ifdef COMPILER2
4280   if (!UseBiasedLocking || EmitSync != 0) {
4281     UseOptoBiasInlining = false;
4282   }
4283 #endif
4284 
4285   // ThreadLocalHandshakesConstraintFunc handles the constraints.
4286   if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4287     log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4288   } else {
4289     log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4290   }
4291 
4292   return JNI_OK;
4293 }
4294 
4295 jint Arguments::adjust_after_os() {
4296   if (UseNUMA) {
4297     if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4298       FLAG_SET_ERGO(bool, UseNUMA, false);
4299     } else if (UseParallelGC || UseParallelOldGC) {
4300       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4301          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4302       }
4303     }
4304     // UseNUMAInterleaving is set to ON for all collectors and
4305     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4306     // such as the parallel collector for Linux and Solaris will
4307     // interleave old gen and survivor spaces on top of NUMA
4308     // allocation policy for the eden space.
4309     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4310     // all platforms and ParallelGC on Windows will interleave all
4311     // of the heap spaces across NUMA nodes.
4312     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4313       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4314     }
4315   }
4316   return JNI_OK;
4317 }
4318 
4319 int Arguments::PropertyList_count(SystemProperty* pl) {
4320   int count = 0;
4321   while(pl != NULL) {
4322     count++;
4323     pl = pl->next();
4324   }
4325   return count;
4326 }
4327 
4328 // Return the number of readable properties.
4329 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4330   int count = 0;
4331   while(pl != NULL) {
4332     if (pl->is_readable()) {
4333       count++;
4334     }
4335     pl = pl->next();
4336   }
4337   return count;
4338 }
4339 
4340 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4341   assert(key != NULL, "just checking");
4342   SystemProperty* prop;
4343   for (prop = pl; prop != NULL; prop = prop->next()) {
4344     if (strcmp(key, prop->key()) == 0) return prop->value();
4345   }
4346   return NULL;
4347 }
4348 
4349 // Return the value of the requested property provided that it is a readable property.
4350 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4351   assert(key != NULL, "just checking");
4352   SystemProperty* prop;
4353   // Return the property value if the keys match and the property is not internal or
4354   // it's the special internal property "jdk.boot.class.path.append".
4355   for (prop = pl; prop != NULL; prop = prop->next()) {
4356     if (strcmp(key, prop->key()) == 0) {
4357       if (!prop->internal()) {
4358         return prop->value();
4359       } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4360         return prop->value();
4361       } else {
4362         // Property is internal and not jdk.boot.class.path.append so return NULL.
4363         return NULL;
4364       }
4365     }
4366   }
4367   return NULL;
4368 }
4369 
4370 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4371   int count = 0;
4372   const char* ret_val = NULL;
4373 
4374   while(pl != NULL) {
4375     if(count >= index) {
4376       ret_val = pl->key();
4377       break;
4378     }
4379     count++;
4380     pl = pl->next();
4381   }
4382 
4383   return ret_val;
4384 }
4385 
4386 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4387   int count = 0;
4388   char* ret_val = NULL;
4389 
4390   while(pl != NULL) {
4391     if(count >= index) {
4392       ret_val = pl->value();
4393       break;
4394     }
4395     count++;
4396     pl = pl->next();
4397   }
4398 
4399   return ret_val;
4400 }
4401 
4402 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4403   SystemProperty* p = *plist;
4404   if (p == NULL) {
4405     *plist = new_p;
4406   } else {
4407     while (p->next() != NULL) {
4408       p = p->next();
4409     }
4410     p->set_next(new_p);
4411   }
4412 }
4413 
4414 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4415                                  bool writeable, bool internal) {
4416   if (plist == NULL)
4417     return;
4418 
4419   SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4420   PropertyList_add(plist, new_p);
4421 }
4422 
4423 void Arguments::PropertyList_add(SystemProperty *element) {
4424   PropertyList_add(&_system_properties, element);
4425 }
4426 
4427 // This add maintains unique property key in the list.
4428 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4429                                         PropertyAppendable append, PropertyWriteable writeable,
4430                                         PropertyInternal internal) {
4431   if (plist == NULL)
4432     return;
4433 
4434   // If property key exist then update with new value.
4435   SystemProperty* prop;
4436   for (prop = *plist; prop != NULL; prop = prop->next()) {
4437     if (strcmp(k, prop->key()) == 0) {
4438       if (append == AppendProperty) {
4439         prop->append_value(v);
4440       } else {
4441         prop->set_value(v);
4442       }
4443       return;
4444     }
4445   }
4446 
4447   PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4448 }
4449 
4450 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4451 // Returns true if all of the source pointed by src has been copied over to
4452 // the destination buffer pointed by buf. Otherwise, returns false.
4453 // Notes:
4454 // 1. If the length (buflen) of the destination buffer excluding the
4455 // NULL terminator character is not long enough for holding the expanded
4456 // pid characters, it also returns false instead of returning the partially
4457 // expanded one.
4458 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4459 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4460                                 char* buf, size_t buflen) {
4461   const char* p = src;
4462   char* b = buf;
4463   const char* src_end = &src[srclen];
4464   char* buf_end = &buf[buflen - 1];
4465 
4466   while (p < src_end && b < buf_end) {
4467     if (*p == '%') {
4468       switch (*(++p)) {
4469       case '%':         // "%%" ==> "%"
4470         *b++ = *p++;
4471         break;
4472       case 'p':  {       //  "%p" ==> current process id
4473         // buf_end points to the character before the last character so
4474         // that we could write '\0' to the end of the buffer.
4475         size_t buf_sz = buf_end - b + 1;
4476         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4477 
4478         // if jio_snprintf fails or the buffer is not long enough to hold
4479         // the expanded pid, returns false.
4480         if (ret < 0 || ret >= (int)buf_sz) {
4481           return false;
4482         } else {
4483           b += ret;
4484           assert(*b == '\0', "fail in copy_expand_pid");
4485           if (p == src_end && b == buf_end + 1) {
4486             // reach the end of the buffer.
4487             return true;
4488           }
4489         }
4490         p++;
4491         break;
4492       }
4493       default :
4494         *b++ = '%';
4495       }
4496     } else {
4497       *b++ = *p++;
4498     }
4499   }
4500   *b = '\0';
4501   return (p == src_end); // return false if not all of the source was copied
4502 }