1 /*
   2  * Copyright (c) 1997, 2017, 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 "classfile/classLoader.hpp"
  27 #include "classfile/javaAssertions.hpp"
  28 #include "classfile/moduleEntry.hpp"
  29 #include "classfile/stringTable.hpp"
  30 #include "classfile/symbolTable.hpp"
  31 #include "gc/shared/cardTableRS.hpp"
  32 #include "gc/shared/genCollectedHeap.hpp"
  33 #include "gc/shared/referenceProcessor.hpp"
  34 #include "gc/shared/taskqueue.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.inline.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/commandLineFlagConstraintList.hpp"
  46 #include "runtime/commandLineFlagWriteableList.hpp"
  47 #include "runtime/commandLineFlagRangeList.hpp"
  48 #include "runtime/globals.hpp"
  49 #include "runtime/globals_extension.hpp"
  50 #include "runtime/java.hpp"
  51 #include "runtime/os.hpp"
  52 #include "runtime/vm_version.hpp"
  53 #include "services/management.hpp"
  54 #include "services/memTracker.hpp"
  55 #include "utilities/defaultStream.hpp"
  56 #include "utilities/macros.hpp"
  57 #include "utilities/stringUtils.hpp"
  58 #if INCLUDE_JVMCI
  59 #include "jvmci/jvmciRuntime.hpp"
  60 #endif
  61 #if INCLUDE_ALL_GCS
  62 #include "gc/cms/compactibleFreeListSpace.hpp"
  63 #include "gc/g1/g1CollectedHeap.inline.hpp"
  64 #include "gc/parallel/parallelScavengeHeap.hpp"
  65 #endif // INCLUDE_ALL_GCS
  66 
  67 // Note: This is a special bug reporting site for the JVM
  68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  69 #define DEFAULT_JAVA_LAUNCHER  "generic"
  70 
  71 char*  Arguments::_jvm_flags_file               = NULL;
  72 char** Arguments::_jvm_flags_array              = NULL;
  73 int    Arguments::_num_jvm_flags                = 0;
  74 char** Arguments::_jvm_args_array               = NULL;
  75 int    Arguments::_num_jvm_args                 = 0;
  76 char*  Arguments::_java_command                 = NULL;
  77 SystemProperty* Arguments::_system_properties   = NULL;
  78 const char*  Arguments::_gc_log_filename        = NULL;
  79 bool   Arguments::_has_profile                  = false;
  80 size_t Arguments::_conservative_max_heap_alignment = 0;
  81 size_t Arguments::_min_heap_size                = 0;
  82 Arguments::Mode Arguments::_mode                = _mixed;
  83 bool   Arguments::_java_compiler                = false;
  84 bool   Arguments::_xdebug_mode                  = false;
  85 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  86 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  87 int    Arguments::_sun_java_launcher_pid        = -1;
  88 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
  89 
  90 // These parameters are reset in method parse_vm_init_args()
  91 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  92 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  93 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  94 bool   Arguments::_ClipInlining                 = ClipInlining;
  95 intx   Arguments::_Tier3InvokeNotifyFreqLog     = Tier3InvokeNotifyFreqLog;
  96 intx   Arguments::_Tier4InvocationThreshold     = Tier4InvocationThreshold;
  97 
  98 char*  Arguments::SharedArchivePath             = NULL;
  99 
 100 AgentLibraryList Arguments::_libraryList;
 101 AgentLibraryList Arguments::_agentList;
 102 
 103 abort_hook_t     Arguments::_abort_hook         = NULL;
 104 exit_hook_t      Arguments::_exit_hook          = NULL;
 105 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 106 
 107 
 108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 109 SystemProperty *Arguments::_java_library_path = NULL;
 110 SystemProperty *Arguments::_java_home = NULL;
 111 SystemProperty *Arguments::_java_class_path = NULL;
 112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
 113 
 114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
 115 PathString *Arguments::_system_boot_class_path = NULL;
 116 bool Arguments::_has_jimage = false;
 117 
 118 char* Arguments::_ext_dirs = NULL;
 119 
 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 121 // part of the option string.
 122 static bool match_option(const JavaVMOption *option, const char* name,
 123                          const char** tail) {
 124   size_t len = strlen(name);
 125   if (strncmp(option->optionString, name, len) == 0) {
 126     *tail = option->optionString + len;
 127     return true;
 128   } else {
 129     return false;
 130   }
 131 }
 132 
 133 // Check if 'option' matches 'name'. No "tail" is allowed.
 134 static bool match_option(const JavaVMOption *option, const char* name) {
 135   const char* tail = NULL;
 136   bool result = match_option(option, name, &tail);
 137   if (tail != NULL && *tail == '\0') {
 138     return result;
 139   } else {
 140     return false;
 141   }
 142 }
 143 
 144 // Return true if any of the strings in null-terminated array 'names' matches.
 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 146 // the option must match exactly.
 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 148   bool tail_allowed) {
 149   for (/* empty */; *names != NULL; ++names) {
 150     if (match_option(option, *names, tail)) {
 151       if (**tail == '\0' || tail_allowed && **tail == ':') {
 152         return true;
 153       }
 154     }
 155   }
 156   return false;
 157 }
 158 
 159 static void logOption(const char* opt) {
 160   if (PrintVMOptions) {
 161     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 162   }
 163 }
 164 
 165 bool needs_module_property_warning = false;
 166 
 167 #define MODULE_PROPERTY_PREFIX "jdk.module."
 168 #define MODULE_PROPERTY_PREFIX_LEN 11
 169 #define ADDEXPORTS "addexports"
 170 #define ADDEXPORTS_LEN 10
 171 #define ADDREADS "addreads"
 172 #define ADDREADS_LEN 8
 173 #define ADDOPENS "addopens"
 174 #define ADDOPENS_LEN 8
 175 #define PATCH "patch"
 176 #define PATCH_LEN 5
 177 #define ADDMODS "addmods"
 178 #define ADDMODS_LEN 7
 179 #define LIMITMODS "limitmods"
 180 #define LIMITMODS_LEN 9
 181 #define PATH "path"
 182 #define PATH_LEN 4
 183 #define UPGRADE_PATH "upgrade.path"
 184 #define UPGRADE_PATH_LEN 12
 185 
 186 // Return TRUE if option matches 'property', or 'property=', or 'property.'.
 187 static bool matches_property_suffix(const char* option, const char* property, size_t len) {
 188   return ((strncmp(option, property, len) == 0) &&
 189           (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
 190 }
 191 
 192 // Return true if property starts with "jdk.module." and its ensuing chars match
 193 // any of the reserved module properties.
 194 // property should be passed without the leading "-D".
 195 bool Arguments::is_internal_module_property(const char* property) {
 196   assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
 197   if  (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
 198     const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
 199     if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
 200         matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
 201         matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
 202         matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
 203         matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
 204         matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
 205         matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
 206         matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
 207       return true;
 208     }
 209   }
 210   return false;
 211 }
 212 
 213 // Process java launcher properties.
 214 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 215   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 216   // sun.java.launcher.pid is defined.
 217   // Must do this before setting up other system properties,
 218   // as some of them may depend on launcher type.
 219   for (int index = 0; index < args->nOptions; index++) {
 220     const JavaVMOption* option = args->options + index;
 221     const char* tail;
 222 
 223     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 224       process_java_launcher_argument(tail, option->extraInfo);
 225       continue;
 226     }
 227     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 228       if (strcmp(tail, "true") == 0) {
 229         _sun_java_launcher_is_altjvm = true;
 230       }
 231       continue;
 232     }
 233     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 234       _sun_java_launcher_pid = atoi(tail);
 235       continue;
 236     }
 237   }
 238 }
 239 
 240 // Initialize system properties key and value.
 241 void Arguments::init_system_properties() {
 242 
 243   // Set up _system_boot_class_path which is not a property but
 244   // relies heavily on argument processing and the jdk.boot.class.path.append
 245   // property. It is used to store the underlying system boot class path.
 246   _system_boot_class_path = new PathString(NULL);
 247 
 248   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 249                                                            "Java Virtual Machine Specification",  false));
 250   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 251   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 252   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 253   PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(),  false));
 254 
 255   // Following are JVMTI agent writable properties.
 256   // Properties values are set to NULL and they are
 257   // os specific they are initialized in os::init_system_properties_values().
 258   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 259   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 260   _java_home =  new SystemProperty("java.home", NULL,  true);
 261   _java_class_path = new SystemProperty("java.class.path", "",  true);
 262   // jdk.boot.class.path.append is a non-writeable, internal property.
 263   // It can only be set by either:
 264   //    - -Xbootclasspath/a:
 265   //    - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
 266   _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
 267 
 268   // Add to System Property list.
 269   PropertyList_add(&_system_properties, _sun_boot_library_path);
 270   PropertyList_add(&_system_properties, _java_library_path);
 271   PropertyList_add(&_system_properties, _java_home);
 272   PropertyList_add(&_system_properties, _java_class_path);
 273   PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
 274 
 275   // Set OS specific system properties values
 276   os::init_system_properties_values();
 277 }
 278 
 279 // Update/Initialize System properties after JDK version number is known
 280 void Arguments::init_version_specific_system_properties() {
 281   enum { bufsz = 16 };
 282   char buffer[bufsz];
 283   const char* spec_vendor = "Oracle Corporation";
 284   uint32_t spec_version = JDK_Version::current().major_version();
 285 
 286   jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
 287 
 288   PropertyList_add(&_system_properties,
 289       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 290   PropertyList_add(&_system_properties,
 291       new SystemProperty("java.vm.specification.version", buffer, false));
 292   PropertyList_add(&_system_properties,
 293       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 294 }
 295 
 296 /*
 297  *  -XX argument processing:
 298  *
 299  *  -XX arguments are defined in several places, such as:
 300  *      globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
 301  *  -XX arguments are parsed in parse_argument().
 302  *  -XX argument bounds checking is done in check_vm_args_consistency().
 303  *
 304  * Over time -XX arguments may change. There are mechanisms to handle common cases:
 305  *
 306  *      ALIASED: An option that is simply another name for another option. This is often
 307  *               part of the process of deprecating a flag, but not all aliases need
 308  *               to be deprecated.
 309  *
 310  *               Create an alias for an option by adding the old and new option names to the
 311  *               "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
 312  *
 313  *   DEPRECATED: An option that is supported, but a warning is printed to let the user know that
 314  *               support may be removed in the future. Both regular and aliased options may be
 315  *               deprecated.
 316  *
 317  *               Add a deprecation warning for an option (or alias) by adding an entry in the
 318  *               "special_jvm_flags" table and setting the "deprecated_in" field.
 319  *               Often an option "deprecated" in one major release will
 320  *               be made "obsolete" in the next. In this case the entry should also have it's
 321  *               "obsolete_in" field set.
 322  *
 323  *     OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
 324  *               on the command line. A warning is printed to let the user know that option might not
 325  *               be accepted in the future.
 326  *
 327  *               Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
 328  *               table and setting the "obsolete_in" field.
 329  *
 330  *      EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
 331  *               to the current JDK version. The system will flatly refuse to admit the existence of
 332  *               the flag. This allows a flag to die automatically over JDK releases.
 333  *
 334  *               Note that manual cleanup of expired options should be done at major JDK version upgrades:
 335  *                  - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
 336  *                  - Newly obsolete or expired deprecated options should have their global variable
 337  *                    definitions removed (from globals.hpp, etc) and related implementations removed.
 338  *
 339  * Recommended approach for removing options:
 340  *
 341  * To remove options commonly used by customers (e.g. product, commercial -XX options), use
 342  * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
 343  *
 344  * To remove internal options (e.g. diagnostic, experimental, develop options), use
 345  * a 2-step model adding major release numbers to the obsolete and expire columns.
 346  *
 347  * To change the name of an option, use the alias table as well as a 2-step
 348  * model adding major release numbers to the deprecate and expire columns.
 349  * Think twice about aliasing commonly used customer options.
 350  *
 351  * There are times when it is appropriate to leave a future release number as undefined.
 352  *
 353  * Tests:  Aliases should be tested in VMAliasOptions.java.
 354  *         Deprecated options should be tested in VMDeprecatedOptions.java.
 355  */
 356 
 357 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
 358 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
 359 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
 360 // the command-line as usual, but will issue a warning.
 361 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
 362 // the command-line, while issuing a warning and ignoring the flag value.
 363 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
 364 // existence of the flag.
 365 //
 366 // MANUAL CLEANUP ON JDK VERSION UPDATES:
 367 // This table ensures that the handling of options will update automatically when the JDK
 368 // version is incremented, but the source code needs to be cleanup up manually:
 369 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
 370 //   variable should be removed, as well as users of the variable.
 371 // - As "deprecated" options age into "obsolete" options, move the entry into the
 372 //   "Obsolete Flags" section of the table.
 373 // - All expired options should be removed from the table.
 374 static SpecialFlag const special_jvm_flags[] = {
 375   // -------------- Deprecated Flags --------------
 376   // --- Non-alias flags - sorted by obsolete_in then expired_in:
 377   { "MaxGCMinorPauseMillis",        JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
 378 
 379   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
 380   { "DefaultMaxRAMFraction",        JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
 381   { "CreateMinidumpOnCrash",        JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 382 
 383   // -------------- Obsolete Flags - sorted by expired_in --------------
 384   { "ConvertSleepToYield",           JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
 385   { "ConvertYieldToSleep",           JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
 386   { "MinSleepInterval",              JDK_Version::jdk(9),      JDK_Version::jdk(10), JDK_Version::jdk(11) },
 387   { "PermSize",                      JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
 388   { "MaxPermSize",                   JDK_Version::undefined(), JDK_Version::jdk(8),  JDK_Version::undefined() },
 389 
 390 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
 391   { "dep > obs",                    JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
 392   { "dep > exp ",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
 393   { "obs > exp ",                   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
 394   { "not deprecated or obsolete",   JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
 395   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 396   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 397   { "BytecodeVerificationRemote",   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
 398 #endif
 399 
 400   { NULL, JDK_Version(0), JDK_Version(0) }
 401 };
 402 
 403 // Flags that are aliases for other flags.
 404 typedef struct {
 405   const char* alias_name;
 406   const char* real_name;
 407 } AliasedFlag;
 408 
 409 static AliasedFlag const aliased_jvm_flags[] = {
 410   { "DefaultMaxRAMFraction",    "MaxRAMFraction"    },
 411   { "CreateMinidumpOnCrash",    "CreateCoredumpOnCrash" },
 412   { NULL, NULL}
 413 };
 414 
 415 // NOTE: A compatibility request will be necessary for each alias to be removed.
 416 static AliasedLoggingFlag const aliased_logging_flags[] = {
 417   { "PrintCompressedOopsMode",   LogLevel::Info,  true,  LOG_TAGS(gc, heap, coops) },
 418   { "TraceBiasedLocking",        LogLevel::Info,  true,  LOG_TAGS(biasedlocking) },
 419   { "TraceClassLoading",         LogLevel::Info,  true,  LOG_TAGS(class, load) },
 420   { "TraceClassLoadingPreorder", LogLevel::Debug, true,  LOG_TAGS(class, preorder) },
 421   { "TraceClassPaths",           LogLevel::Info,  true,  LOG_TAGS(class, path) },
 422   { "TraceClassResolution",      LogLevel::Debug, true,  LOG_TAGS(class, resolve) },
 423   { "TraceClassUnloading",       LogLevel::Info,  true,  LOG_TAGS(class, unload) },
 424   { "TraceExceptions",           LogLevel::Info,  true,  LOG_TAGS(exceptions) },
 425   { "TraceLoaderConstraints",    LogLevel::Info,  true,  LOG_TAGS(class, loader, constraints) },
 426   { "TraceMonitorInflation",     LogLevel::Debug, true,  LOG_TAGS(monitorinflation) },
 427   { "TraceSafepointCleanupTime", LogLevel::Info,  true,  LOG_TAGS(safepoint, cleanup) },
 428   { "TraceJVMTIObjectTagging",   LogLevel::Debug, true,  LOG_TAGS(jvmti, objecttagging) },
 429   { "TraceRedefineClasses",      LogLevel::Info,  false, LOG_TAGS(redefine, class) },
 430   { NULL,                        LogLevel::Off,   false, LOG_TAGS(_NO_TAG) }
 431 };
 432 
 433 #ifndef PRODUCT
 434 // These options are removed in jdk9. Remove this code for jdk10.
 435 static AliasedFlag const removed_develop_logging_flags[] = {
 436   { "TraceClassInitialization",   "-Xlog:class+init" },
 437   { "TraceClassLoaderData",       "-Xlog:class+loader+data" },
 438   { "TraceDefaultMethods",        "-Xlog:defaultmethods=debug" },
 439   { "TraceItables",               "-Xlog:itables=debug" },
 440   { "TraceMonitorMismatch",       "-Xlog:monitormismatch=info" },
 441   { "TraceSafepoint",             "-Xlog:safepoint=debug" },
 442   { "TraceStartupTime",           "-Xlog:startuptime" },
 443   { "TraceVMOperation",           "-Xlog:vmoperation=debug" },
 444   { "PrintVtables",               "-Xlog:vtables=debug" },
 445   { "VerboseVerification",        "-Xlog:verification" },
 446   { NULL, NULL }
 447 };
 448 #endif //PRODUCT
 449 
 450 // Return true if "v" is less than "other", where "other" may be "undefined".
 451 static bool version_less_than(JDK_Version v, JDK_Version other) {
 452   assert(!v.is_undefined(), "must be defined");
 453   if (!other.is_undefined() && v.compare(other) >= 0) {
 454     return false;
 455   } else {
 456     return true;
 457   }
 458 }
 459 
 460 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
 461 
 462 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
 463   // Allow extensions to have priority
 464   if (lookup_special_flag_ext(flag_name, flag)) {
 465     return true;
 466   }
 467 
 468   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 469     if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 470       flag = special_jvm_flags[i];
 471       return true;
 472     }
 473   }
 474   return false;
 475 }
 476 
 477 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
 478   assert(version != NULL, "Must provide a version buffer");
 479   SpecialFlag flag;
 480   if (lookup_special_flag(flag_name, flag)) {
 481     if (!flag.obsolete_in.is_undefined()) {
 482       if (version_less_than(JDK_Version::current(), flag.expired_in)) {
 483         *version = flag.obsolete_in;
 484         return true;
 485       }
 486     }
 487   }
 488   return false;
 489 }
 490 
 491 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
 492   assert(version != NULL, "Must provide a version buffer");
 493   SpecialFlag flag;
 494   if (lookup_special_flag(flag_name, flag)) {
 495     if (!flag.deprecated_in.is_undefined()) {
 496       if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
 497           version_less_than(JDK_Version::current(), flag.expired_in)) {
 498         *version = flag.deprecated_in;
 499         return 1;
 500       } else {
 501         return -1;
 502       }
 503     }
 504   }
 505   return 0;
 506 }
 507 
 508 #ifndef PRODUCT
 509 const char* Arguments::removed_develop_logging_flag_name(const char* name){
 510   for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
 511     const AliasedFlag& flag = removed_develop_logging_flags[i];
 512     if (strcmp(flag.alias_name, name) == 0) {
 513       return flag.real_name;
 514     }
 515   }
 516   return NULL;
 517 }
 518 #endif // PRODUCT
 519 
 520 const char* Arguments::real_flag_name(const char *flag_name) {
 521   for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
 522     const AliasedFlag& flag_status = aliased_jvm_flags[i];
 523     if (strcmp(flag_status.alias_name, flag_name) == 0) {
 524         return flag_status.real_name;
 525     }
 526   }
 527   return flag_name;
 528 }
 529 
 530 #ifdef ASSERT
 531 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
 532   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 533     if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 534       return true;
 535     }
 536   }
 537   return false;
 538 }
 539 
 540 static bool verify_special_jvm_flags() {
 541   bool success = true;
 542   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 543     const SpecialFlag& flag = special_jvm_flags[i];
 544     if (lookup_special_flag(flag.name, i)) {
 545       warning("Duplicate special flag declaration \"%s\"", flag.name);
 546       success = false;
 547     }
 548     if (flag.deprecated_in.is_undefined() &&
 549         flag.obsolete_in.is_undefined()) {
 550       warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
 551       success = false;
 552     }
 553 
 554     if (!flag.deprecated_in.is_undefined()) {
 555       if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
 556         warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
 557         success = false;
 558       }
 559 
 560       if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
 561         warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
 562         success = false;
 563       }
 564     }
 565 
 566     if (!flag.obsolete_in.is_undefined()) {
 567       if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
 568         warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
 569         success = false;
 570       }
 571 
 572       // if flag has become obsolete it should not have a "globals" flag defined anymore.
 573       if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 574         if (Flag::find_flag(flag.name) != NULL) {
 575           warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
 576           success = false;
 577         }
 578       }
 579     }
 580 
 581     if (!flag.expired_in.is_undefined()) {
 582       // if flag has become expired it should not have a "globals" flag defined anymore.
 583       if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
 584         if (Flag::find_flag(flag.name) != NULL) {
 585           warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
 586           success = false;
 587         }
 588       }
 589     }
 590 
 591   }
 592   return success;
 593 }
 594 #endif
 595 
 596 // Parses a size specification string.
 597 bool Arguments::atojulong(const char *s, julong* result) {
 598   julong n = 0;
 599 
 600   // First char must be a digit. Don't allow negative numbers or leading spaces.
 601   if (!isdigit(*s)) {
 602     return false;
 603   }
 604 
 605   bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
 606   char* remainder;
 607   errno = 0;
 608   n = strtoull(s, &remainder, (is_hex ? 16 : 10));
 609   if (errno != 0) {
 610     return false;
 611   }
 612 
 613   // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
 614   if (remainder == s || strlen(remainder) > 1) {
 615     return false;
 616   }
 617 
 618   switch (*remainder) {
 619     case 'T': case 't':
 620       *result = n * G * K;
 621       // Check for overflow.
 622       if (*result/((julong)G * K) != n) return false;
 623       return true;
 624     case 'G': case 'g':
 625       *result = n * G;
 626       if (*result/G != n) return false;
 627       return true;
 628     case 'M': case 'm':
 629       *result = n * M;
 630       if (*result/M != n) return false;
 631       return true;
 632     case 'K': case 'k':
 633       *result = n * K;
 634       if (*result/K != n) return false;
 635       return true;
 636     case '\0':
 637       *result = n;
 638       return true;
 639     default:
 640       return false;
 641   }
 642 }
 643 
 644 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 645   if (size < min_size) return arg_too_small;
 646   // Check that size will fit in a size_t (only relevant on 32-bit)
 647   if (size > max_uintx) return arg_too_big;
 648   return arg_in_range;
 649 }
 650 
 651 // Describe an argument out of range error
 652 void Arguments::describe_range_error(ArgsRange errcode) {
 653   switch(errcode) {
 654   case arg_too_big:
 655     jio_fprintf(defaultStream::error_stream(),
 656                 "The specified size exceeds the maximum "
 657                 "representable size.\n");
 658     break;
 659   case arg_too_small:
 660   case arg_unreadable:
 661   case arg_in_range:
 662     // do nothing for now
 663     break;
 664   default:
 665     ShouldNotReachHere();
 666   }
 667 }
 668 
 669 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
 670   if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
 671     return true;
 672   } else {
 673     return false;
 674   }
 675 }
 676 
 677 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
 678   char* end;
 679   errno = 0;
 680   double v = strtod(value, &end);
 681   if ((errno != 0) || (*end != 0)) {
 682     return false;
 683   }
 684 
 685   if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
 686     return true;
 687   }
 688   return false;
 689 }
 690 
 691 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
 692   julong v;
 693   int int_v;
 694   intx intx_v;
 695   bool is_neg = false;
 696   Flag* result = Flag::find_flag(name, strlen(name));
 697 
 698   if (result == NULL) {
 699     return false;
 700   }
 701 
 702   // Check the sign first since atojulong() parses only unsigned values.
 703   if (*value == '-') {
 704     if (!result->is_intx() && !result->is_int()) {
 705       return false;
 706     }
 707     value++;
 708     is_neg = true;
 709   }
 710   if (!Arguments::atojulong(value, &v)) {
 711     return false;
 712   }
 713   if (result->is_int()) {
 714     int_v = (int) v;
 715     if (is_neg) {
 716       int_v = -int_v;
 717     }
 718     return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
 719   } else if (result->is_uint()) {
 720     uint uint_v = (uint) v;
 721     return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
 722   } else if (result->is_intx()) {
 723     intx_v = (intx) v;
 724     if (is_neg) {
 725       intx_v = -intx_v;
 726     }
 727     return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
 728   } else if (result->is_uintx()) {
 729     uintx uintx_v = (uintx) v;
 730     return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
 731   } else if (result->is_uint64_t()) {
 732     uint64_t uint64_t_v = (uint64_t) v;
 733     return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
 734   } else if (result->is_size_t()) {
 735     size_t size_t_v = (size_t) v;
 736     return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
 737   } else {
 738     return false;
 739   }
 740 }
 741 
 742 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
 743   if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
 744   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 745   FREE_C_HEAP_ARRAY(char, value);
 746   return true;
 747 }
 748 
 749 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
 750   const char* old_value = "";
 751   if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
 752   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 753   size_t new_len = strlen(new_value);
 754   const char* value;
 755   char* free_this_too = NULL;
 756   if (old_len == 0) {
 757     value = new_value;
 758   } else if (new_len == 0) {
 759     value = old_value;
 760   } else {
 761      size_t length = old_len + 1 + new_len + 1;
 762      char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
 763     // each new setting adds another LINE to the switch:
 764     jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
 765     value = buf;
 766     free_this_too = buf;
 767   }
 768   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 769   // CommandLineFlags always returns a pointer that needs freeing.
 770   FREE_C_HEAP_ARRAY(char, value);
 771   if (free_this_too != NULL) {
 772     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 773     FREE_C_HEAP_ARRAY(char, free_this_too);
 774   }
 775   return true;
 776 }
 777 
 778 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
 779   const char* real_name = real_flag_name(arg);
 780   JDK_Version since = JDK_Version();
 781   switch (is_deprecated_flag(arg, &since)) {
 782     case -1:
 783       return NULL; // obsolete or expired, don't process normally
 784     case 0:
 785       return real_name;
 786     case 1: {
 787       if (warn) {
 788         char version[256];
 789         since.to_string(version, sizeof(version));
 790         if (real_name != arg) {
 791           warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
 792                   arg, version, real_name);
 793         } else {
 794           warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
 795                   arg, version);
 796         }
 797       }
 798       return real_name;
 799     }
 800   }
 801   ShouldNotReachHere();
 802   return NULL;
 803 }
 804 
 805 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
 806   LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
 807   // Set tagset string buffer at max size of 256, large enough for any alias tagset
 808   const int max_tagset_size = 256;
 809   int max_tagset_len = max_tagset_size - 1;
 810   char tagset_buffer[max_tagset_size];
 811   tagset_buffer[0] = '\0';
 812 
 813   // Write tag-set for aliased logging option, in string list form
 814   int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
 815   for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
 816     if (i > 0) {
 817       strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
 818     }
 819     strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
 820   }
 821   if (!alf.exactMatch) {
 822       strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
 823   }
 824   log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
 825                          (on) ? "+" : "-",
 826                          name,
 827                          tagset_buffer,
 828                          (on) ? LogLevel::name(alf.level) : "off");
 829 }
 830 
 831 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
 832   for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
 833     const AliasedLoggingFlag& alf = aliased_logging_flags[i];
 834     if (strcmp(alf.alias_name, name) == 0) {
 835       log_deprecated_flag(name, on, alf);
 836       return alf;
 837     }
 838   }
 839   AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
 840   return a;
 841 }
 842 
 843 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 844 
 845   // range of acceptable characters spelled out for portability reasons
 846 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 847 #define BUFLEN 255
 848   char name[BUFLEN+1];
 849   char dummy;
 850   const char* real_name;
 851   bool warn_if_deprecated = true;
 852 
 853   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 854     AliasedLoggingFlag alf = catch_logging_aliases(name, false);
 855     if (alf.alias_name != NULL){
 856       LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
 857       return true;
 858     }
 859     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 860     if (real_name == NULL) {
 861       return false;
 862     }
 863     return set_bool_flag(real_name, false, origin);
 864   }
 865   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 866     AliasedLoggingFlag alf = catch_logging_aliases(name, true);
 867     if (alf.alias_name != NULL){
 868       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
 869       return true;
 870     }
 871     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 872     if (real_name == NULL) {
 873       return false;
 874     }
 875     return set_bool_flag(real_name, true, origin);
 876   }
 877 
 878   char punct;
 879   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 880     const char* value = strchr(arg, '=') + 1;
 881     Flag* flag;
 882 
 883     // this scanf pattern matches both strings (handled here) and numbers (handled later))
 884     AliasedLoggingFlag alf = catch_logging_aliases(name, true);
 885     if (alf.alias_name != NULL) {
 886       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
 887       return true;
 888     }
 889     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 890     if (real_name == NULL) {
 891       return false;
 892     }
 893     flag = Flag::find_flag(real_name);
 894     if (flag != NULL && flag->is_ccstr()) {
 895       if (flag->ccstr_accumulates()) {
 896         return append_to_string_flag(real_name, value, origin);
 897       } else {
 898         if (value[0] == '\0') {
 899           value = NULL;
 900         }
 901         return set_string_flag(real_name, value, origin);
 902       }
 903     } else {
 904       warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
 905     }
 906   }
 907 
 908   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 909     const char* value = strchr(arg, '=') + 1;
 910     // -XX:Foo:=xxx will reset the string flag to the given value.
 911     if (value[0] == '\0') {
 912       value = NULL;
 913     }
 914     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 915     if (real_name == NULL) {
 916       return false;
 917     }
 918     return set_string_flag(real_name, value, origin);
 919   }
 920 
 921 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
 922 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 923 #define        NUMBER_RANGE    "[0123456789eE+-]"
 924   char value[BUFLEN + 1];
 925   char value2[BUFLEN + 1];
 926   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 927     // Looks like a floating-point number -- try again with more lenient format string
 928     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 929       real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 930       if (real_name == NULL) {
 931         return false;
 932       }
 933       return set_fp_numeric_flag(real_name, value, origin);
 934     }
 935   }
 936 
 937 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 938   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 939     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 940     if (real_name == NULL) {
 941       return false;
 942     }
 943     return set_numeric_flag(real_name, value, origin);
 944   }
 945 
 946   return false;
 947 }
 948 
 949 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 950   assert(bldarray != NULL, "illegal argument");
 951 
 952   if (arg == NULL) {
 953     return;
 954   }
 955 
 956   int new_count = *count + 1;
 957 
 958   // expand the array and add arg to the last element
 959   if (*bldarray == NULL) {
 960     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
 961   } else {
 962     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
 963   }
 964   (*bldarray)[*count] = os::strdup_check_oom(arg);
 965   *count = new_count;
 966 }
 967 
 968 void Arguments::build_jvm_args(const char* arg) {
 969   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 970 }
 971 
 972 void Arguments::build_jvm_flags(const char* arg) {
 973   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 974 }
 975 
 976 // utility function to return a string that concatenates all
 977 // strings in a given char** array
 978 const char* Arguments::build_resource_string(char** args, int count) {
 979   if (args == NULL || count == 0) {
 980     return NULL;
 981   }
 982   size_t length = 0;
 983   for (int i = 0; i < count; i++) {
 984     length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
 985   }
 986   char* s = NEW_RESOURCE_ARRAY(char, length);
 987   char* dst = s;
 988   for (int j = 0; j < count; j++) {
 989     size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
 990     jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
 991     dst += offset;
 992     length -= offset;
 993   }
 994   return (const char*) s;
 995 }
 996 
 997 void Arguments::print_on(outputStream* st) {
 998   st->print_cr("VM Arguments:");
 999   if (num_jvm_flags() > 0) {
1000     st->print("jvm_flags: "); print_jvm_flags_on(st);
1001     st->cr();
1002   }
1003   if (num_jvm_args() > 0) {
1004     st->print("jvm_args: "); print_jvm_args_on(st);
1005     st->cr();
1006   }
1007   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1008   if (_java_class_path != NULL) {
1009     char* path = _java_class_path->value();
1010     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1011   }
1012   st->print_cr("Launcher Type: %s", _sun_java_launcher);
1013 }
1014 
1015 void Arguments::print_summary_on(outputStream* st) {
1016   // Print the command line.  Environment variables that are helpful for
1017   // reproducing the problem are written later in the hs_err file.
1018   // flags are from setting file
1019   if (num_jvm_flags() > 0) {
1020     st->print_raw("Settings File: ");
1021     print_jvm_flags_on(st);
1022     st->cr();
1023   }
1024   // args are the command line and environment variable arguments.
1025   st->print_raw("Command Line: ");
1026   if (num_jvm_args() > 0) {
1027     print_jvm_args_on(st);
1028   }
1029   // this is the classfile and any arguments to the java program
1030   if (java_command() != NULL) {
1031     st->print("%s", java_command());
1032   }
1033   st->cr();
1034 }
1035 
1036 void Arguments::print_jvm_flags_on(outputStream* st) {
1037   if (_num_jvm_flags > 0) {
1038     for (int i=0; i < _num_jvm_flags; i++) {
1039       st->print("%s ", _jvm_flags_array[i]);
1040     }
1041   }
1042 }
1043 
1044 void Arguments::print_jvm_args_on(outputStream* st) {
1045   if (_num_jvm_args > 0) {
1046     for (int i=0; i < _num_jvm_args; i++) {
1047       st->print("%s ", _jvm_args_array[i]);
1048     }
1049   }
1050 }
1051 
1052 bool Arguments::process_argument(const char* arg,
1053                                  jboolean ignore_unrecognized,
1054                                  Flag::Flags origin) {
1055   JDK_Version since = JDK_Version();
1056 
1057   if (parse_argument(arg, origin)) {
1058     return true;
1059   }
1060 
1061   // Determine if the flag has '+', '-', or '=' characters.
1062   bool has_plus_minus = (*arg == '+' || *arg == '-');
1063   const char* const argname = has_plus_minus ? arg + 1 : arg;
1064 
1065   size_t arg_len;
1066   const char* equal_sign = strchr(argname, '=');
1067   if (equal_sign == NULL) {
1068     arg_len = strlen(argname);
1069   } else {
1070     arg_len = equal_sign - argname;
1071   }
1072 
1073   // Only make the obsolete check for valid arguments.
1074   if (arg_len <= BUFLEN) {
1075     // Construct a string which consists only of the argument name without '+', '-', or '='.
1076     char stripped_argname[BUFLEN+1]; // +1 for '\0'
1077     jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1078     if (is_obsolete_flag(stripped_argname, &since)) {
1079       char version[256];
1080       since.to_string(version, sizeof(version));
1081       warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1082       return true;
1083     }
1084 #ifndef PRODUCT
1085     else {
1086       const char* replacement;
1087       if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1088         log_warning(arguments)("%s has been removed. Please use %s instead.",
1089                                stripped_argname,
1090                                replacement);
1091         return false;
1092       }
1093     }
1094 #endif //PRODUCT
1095   }
1096 
1097   // For locked flags, report a custom error message if available.
1098   // Otherwise, report the standard unrecognized VM option.
1099   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1100   if (found_flag != NULL) {
1101     char locked_message_buf[BUFLEN];
1102     Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1103     if (strlen(locked_message_buf) == 0) {
1104       if (found_flag->is_bool() && !has_plus_minus) {
1105         jio_fprintf(defaultStream::error_stream(),
1106           "Missing +/- setting for VM option '%s'\n", argname);
1107       } else if (!found_flag->is_bool() && has_plus_minus) {
1108         jio_fprintf(defaultStream::error_stream(),
1109           "Unexpected +/- setting in VM option '%s'\n", argname);
1110       } else {
1111         jio_fprintf(defaultStream::error_stream(),
1112           "Improperly specified VM option '%s'\n", argname);
1113       }
1114     } else {
1115 #ifdef PRODUCT
1116       bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1117                          (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1118       if (ignore_unrecognized && mismatched) {
1119         return true;
1120       }
1121 #endif
1122       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1123     }
1124   } else {
1125     if (ignore_unrecognized) {
1126       return true;
1127     }
1128     jio_fprintf(defaultStream::error_stream(),
1129                 "Unrecognized VM option '%s'\n", argname);
1130     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1131     if (fuzzy_matched != NULL) {
1132       jio_fprintf(defaultStream::error_stream(),
1133                   "Did you mean '%s%s%s'? ",
1134                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1135                   fuzzy_matched->_name,
1136                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
1137     }
1138   }
1139 
1140   // allow for commandline "commenting out" options like -XX:#+Verbose
1141   return arg[0] == '#';
1142 }
1143 
1144 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1145   FILE* stream = fopen(file_name, "rb");
1146   if (stream == NULL) {
1147     if (should_exist) {
1148       jio_fprintf(defaultStream::error_stream(),
1149                   "Could not open settings file %s\n", file_name);
1150       return false;
1151     } else {
1152       return true;
1153     }
1154   }
1155 
1156   char token[1024];
1157   int  pos = 0;
1158 
1159   bool in_white_space = true;
1160   bool in_comment     = false;
1161   bool in_quote       = false;
1162   char quote_c        = 0;
1163   bool result         = true;
1164 
1165   int c = getc(stream);
1166   while(c != EOF && pos < (int)(sizeof(token)-1)) {
1167     if (in_white_space) {
1168       if (in_comment) {
1169         if (c == '\n') in_comment = false;
1170       } else {
1171         if (c == '#') in_comment = true;
1172         else if (!isspace(c)) {
1173           in_white_space = false;
1174           token[pos++] = c;
1175         }
1176       }
1177     } else {
1178       if (c == '\n' || (!in_quote && isspace(c))) {
1179         // token ends at newline, or at unquoted whitespace
1180         // this allows a way to include spaces in string-valued options
1181         token[pos] = '\0';
1182         logOption(token);
1183         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1184         build_jvm_flags(token);
1185         pos = 0;
1186         in_white_space = true;
1187         in_quote = false;
1188       } else if (!in_quote && (c == '\'' || c == '"')) {
1189         in_quote = true;
1190         quote_c = c;
1191       } else if (in_quote && (c == quote_c)) {
1192         in_quote = false;
1193       } else {
1194         token[pos++] = c;
1195       }
1196     }
1197     c = getc(stream);
1198   }
1199   if (pos > 0) {
1200     token[pos] = '\0';
1201     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1202     build_jvm_flags(token);
1203   }
1204   fclose(stream);
1205   return result;
1206 }
1207 
1208 //=============================================================================================================
1209 // Parsing of properties (-D)
1210 
1211 const char* Arguments::get_property(const char* key) {
1212   return PropertyList_get_value(system_properties(), key);
1213 }
1214 
1215 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1216   const char* eq = strchr(prop, '=');
1217   const char* key;
1218   const char* value = "";
1219 
1220   if (eq == NULL) {
1221     // property doesn't have a value, thus use passed string
1222     key = prop;
1223   } else {
1224     // property have a value, thus extract it and save to the
1225     // allocated string
1226     size_t key_len = eq - prop;
1227     char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1228 
1229     jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1230     key = tmp_key;
1231 
1232     value = &prop[key_len + 1];
1233   }
1234 
1235   if (strcmp(key, "java.compiler") == 0) {
1236     process_java_compiler_argument(value);
1237     // Record value in Arguments, but let it get passed to Java.
1238   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1239              strcmp(key, "sun.java.launcher.pid") == 0) {
1240     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1241     // private and are processed in process_sun_java_launcher_properties();
1242     // the sun.java.launcher property is passed on to the java application
1243   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1244     // append is true, writable is true, internal is false
1245     PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1246                             WriteableProperty, ExternalProperty);
1247   } else {
1248     if (strcmp(key, "sun.java.command") == 0) {
1249       char *old_java_command = _java_command;
1250       _java_command = os::strdup_check_oom(value, mtArguments);
1251       if (old_java_command != NULL) {
1252         os::free(old_java_command);
1253       }
1254     } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1255       const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1256       // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1257       // its value without going through the property list or making a Java call.
1258       _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1259       if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1260         assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1261         os::free((void *)old_java_vendor_url_bug);
1262       }
1263     }
1264 
1265     // Create new property and add at the end of the list
1266     PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1267   }
1268 
1269   if (key != prop) {
1270     // SystemProperty copy passed value, thus free previously allocated
1271     // memory
1272     FreeHeap((void *)key);
1273   }
1274 
1275   return true;
1276 }
1277 
1278 #if INCLUDE_CDS
1279 void Arguments::check_unsupported_dumping_properties() {
1280   assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1281   const char* unsupported_properties[] = { "jdk.module.main",
1282                                            "jdk.module.limitmods",
1283                                            "jdk.module.path",
1284                                            "jdk.module.upgrade.path",
1285                                            "jdk.module.addmods.0",
1286                                            "jdk.module.patch.0" };
1287   const char* unsupported_options[] = { "-m", // cannot use at dump time
1288                                         "--limit-modules", // ignored at dump time
1289                                         "--module-path", // ignored at dump time
1290                                         "--upgrade-module-path", // ignored at dump time
1291                                         "--add-modules", // ignored at dump time
1292                                         "--patch-module" // ignored at dump time
1293                                       };
1294   assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1295   // If a vm option is found in the unsupported_options array with index less than the info_idx,
1296   // vm will exit with an error message. Otherwise, it will print an informational message if
1297   // PrintSharedSpaces is enabled.
1298   uint info_idx = 1;
1299   SystemProperty* sp = system_properties();
1300   while (sp != NULL) {
1301     for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1302       if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1303         if (i < info_idx) {
1304           vm_exit_during_initialization(
1305             "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1306         } else {
1307           if (PrintSharedSpaces) {
1308             tty->print_cr(
1309               "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1310           }
1311         }
1312       }
1313     }
1314     sp = sp->next();
1315   }
1316 
1317   // Check for an exploded module build in use with -Xshare:dump.
1318   if (!has_jimage()) {
1319     vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1320   }
1321 }
1322 #endif
1323 
1324 //===========================================================================================================
1325 // Setting int/mixed/comp mode flags
1326 
1327 void Arguments::set_mode_flags(Mode mode) {
1328   // Set up default values for all flags.
1329   // If you add a flag to any of the branches below,
1330   // add a default value for it here.
1331   set_java_compiler(false);
1332   _mode                      = mode;
1333 
1334   // Ensure Agent_OnLoad has the correct initial values.
1335   // This may not be the final mode; mode may change later in onload phase.
1336   PropertyList_unique_add(&_system_properties, "java.vm.info",
1337                           VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1338 
1339   UseInterpreter             = true;
1340   UseCompiler                = true;
1341   UseLoopCounter             = true;
1342 
1343   // Default values may be platform/compiler dependent -
1344   // use the saved values
1345   ClipInlining               = Arguments::_ClipInlining;
1346   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1347   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1348   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1349   if (TieredCompilation) {
1350     if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1351       Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1352     }
1353     if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1354       Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1355     }
1356   }
1357 
1358   // Change from defaults based on mode
1359   switch (mode) {
1360   default:
1361     ShouldNotReachHere();
1362     break;
1363   case _int:
1364     UseCompiler              = false;
1365     UseLoopCounter           = false;
1366     AlwaysCompileLoopMethods = false;
1367     UseOnStackReplacement    = false;
1368     break;
1369   case _mixed:
1370     // same as default
1371     break;
1372   case _comp:
1373     UseInterpreter           = false;
1374     BackgroundCompilation    = false;
1375     ClipInlining             = false;
1376     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1377     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1378     // compile a level 4 (C2) and then continue executing it.
1379     if (TieredCompilation) {
1380       Tier3InvokeNotifyFreqLog = 0;
1381       Tier4InvocationThreshold = 0;
1382     }
1383     break;
1384   }
1385 }
1386 
1387 // Conflict: required to use shared spaces (-Xshare:on), but
1388 // incompatible command line options were chosen.
1389 static void no_shared_spaces(const char* message) {
1390   if (RequireSharedSpaces) {
1391     jio_fprintf(defaultStream::error_stream(),
1392       "Class data sharing is inconsistent with other specified options.\n");
1393     vm_exit_during_initialization("Unable to use shared archive.", message);
1394   } else {
1395     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1396   }
1397 }
1398 
1399 // Returns threshold scaled with the value of scale.
1400 // If scale < 0.0, threshold is returned without scaling.
1401 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1402   if (scale == 1.0 || scale < 0.0) {
1403     return threshold;
1404   } else {
1405     return (intx)(threshold * scale);
1406   }
1407 }
1408 
1409 // Returns freq_log scaled with the value of scale.
1410 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1411 // If scale < 0.0, freq_log is returned without scaling.
1412 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1413   // Check if scaling is necessary or if negative value was specified.
1414   if (scale == 1.0 || scale < 0.0) {
1415     return freq_log;
1416   }
1417   // Check values to avoid calculating log2 of 0.
1418   if (scale == 0.0 || freq_log == 0) {
1419     return 0;
1420   }
1421   // Determine the maximum notification frequency value currently supported.
1422   // The largest mask value that the interpreter/C1 can handle is
1423   // of length InvocationCounter::number_of_count_bits. Mask values are always
1424   // one bit shorter then the value of the notification frequency. Set
1425   // max_freq_bits accordingly.
1426   intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1427   intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1428   if (scaled_freq == 0) {
1429     // Return 0 right away to avoid calculating log2 of 0.
1430     return 0;
1431   } else if (scaled_freq > nth_bit(max_freq_bits)) {
1432     return max_freq_bits;
1433   } else {
1434     return log2_intptr(scaled_freq);
1435   }
1436 }
1437 
1438 void Arguments::set_tiered_flags() {
1439   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1440   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1441     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1442   }
1443   if (CompilationPolicyChoice < 2) {
1444     vm_exit_during_initialization(
1445       "Incompatible compilation policy selected", NULL);
1446   }
1447   // Increase the code cache size - tiered compiles a lot more.
1448   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1449     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1450                   MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1451   }
1452   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1453   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1454     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1455   }
1456   if (!UseInterpreter) { // -Xcomp
1457     Tier3InvokeNotifyFreqLog = 0;
1458     Tier4InvocationThreshold = 0;
1459   }
1460 
1461   if (CompileThresholdScaling < 0) {
1462     vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1463   }
1464 
1465   // Scale tiered compilation thresholds.
1466   // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1467   if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1468     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1469     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1470 
1471     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1472     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1473     FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1474     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1475 
1476     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1477     // once these thresholds become supported.
1478 
1479     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1480     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1481 
1482     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1483     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1484 
1485     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1486 
1487     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1488     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1489     FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1490     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1491   }
1492 }
1493 
1494 #if INCLUDE_ALL_GCS
1495 static void disable_adaptive_size_policy(const char* collector_name) {
1496   if (UseAdaptiveSizePolicy) {
1497     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1498       warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1499               collector_name);
1500     }
1501     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1502   }
1503 }
1504 
1505 void Arguments::set_parnew_gc_flags() {
1506   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1507          "control point invariant");
1508   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1509 
1510   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1511     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1512     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1513   } else if (ParallelGCThreads == 0) {
1514     jio_fprintf(defaultStream::error_stream(),
1515         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1516     vm_exit(1);
1517   }
1518 
1519   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1520   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1521   // we set them to 1024 and 1024.
1522   // See CR 6362902.
1523   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1524     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1525   }
1526   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1527     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1528   }
1529 
1530   // When using compressed oops, we use local overflow stacks,
1531   // rather than using a global overflow list chained through
1532   // the klass word of the object's pre-image.
1533   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1534     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1535       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1536     }
1537     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1538   }
1539   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1540 }
1541 
1542 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1543 // sparc/solaris for certain applications, but would gain from
1544 // further optimization and tuning efforts, and would almost
1545 // certainly gain from analysis of platform and environment.
1546 void Arguments::set_cms_and_parnew_gc_flags() {
1547   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1548   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1549 
1550   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1551   disable_adaptive_size_policy("UseConcMarkSweepGC");
1552 
1553   set_parnew_gc_flags();
1554 
1555   size_t max_heap = align_size_down(MaxHeapSize,
1556                                     CardTableRS::ct_max_alignment_constraint());
1557 
1558   // Now make adjustments for CMS
1559   intx   tenuring_default = (intx)6;
1560   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1561 
1562   // Preferred young gen size for "short" pauses:
1563   // upper bound depends on # of threads and NewRatio.
1564   const size_t preferred_max_new_size_unaligned =
1565     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1566   size_t preferred_max_new_size =
1567     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1568 
1569   // Unless explicitly requested otherwise, size young gen
1570   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1571 
1572   // If either MaxNewSize or NewRatio is set on the command line,
1573   // assume the user is trying to set the size of the young gen.
1574   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1575 
1576     // Set MaxNewSize to our calculated preferred_max_new_size unless
1577     // NewSize was set on the command line and it is larger than
1578     // preferred_max_new_size.
1579     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1580       FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1581     } else {
1582       FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1583     }
1584     log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1585 
1586     // Code along this path potentially sets NewSize and OldSize
1587     log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size:  " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1588                         min_heap_size(), InitialHeapSize, max_heap);
1589     size_t min_new = preferred_max_new_size;
1590     if (FLAG_IS_CMDLINE(NewSize)) {
1591       min_new = NewSize;
1592     }
1593     if (max_heap > min_new && min_heap_size() > min_new) {
1594       // Unless explicitly requested otherwise, make young gen
1595       // at least min_new, and at most preferred_max_new_size.
1596       if (FLAG_IS_DEFAULT(NewSize)) {
1597         FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1598         FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1599         log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1600       }
1601       // Unless explicitly requested otherwise, size old gen
1602       // so it's NewRatio x of NewSize.
1603       if (FLAG_IS_DEFAULT(OldSize)) {
1604         if (max_heap > NewSize) {
1605           FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1606           log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1607         }
1608       }
1609     }
1610   }
1611   // Unless explicitly requested otherwise, definitely
1612   // promote all objects surviving "tenuring_default" scavenges.
1613   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1614       FLAG_IS_DEFAULT(SurvivorRatio)) {
1615     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1616   }
1617   // If we decided above (or user explicitly requested)
1618   // `promote all' (via MaxTenuringThreshold := 0),
1619   // prefer minuscule survivor spaces so as not to waste
1620   // space for (non-existent) survivors
1621   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1622     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1623   }
1624 
1625   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1626   // but rather the number of free blocks of a given size that are used when
1627   // replenishing the local per-worker free list caches.
1628   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1629     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1630       // OldPLAB sizing manually turned off: Use a larger default setting,
1631       // unless it was manually specified. This is because a too-low value
1632       // will slow down scavenges.
1633       FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1634     } else {
1635       FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1636     }
1637   }
1638 
1639   // If either of the static initialization defaults have changed, note this
1640   // modification.
1641   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1642     CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1643   }
1644 
1645   log_trace(gc)("MarkStackSize: %uk  MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1646 }
1647 #endif // INCLUDE_ALL_GCS
1648 
1649 void set_object_alignment() {
1650   // Object alignment.
1651   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1652   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1653   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1654   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1655   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1656   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1657 
1658   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1659   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1660 
1661   // Oop encoding heap max
1662   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1663 
1664   if (SurvivorAlignmentInBytes == 0) {
1665     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1666   }
1667 
1668 #if INCLUDE_ALL_GCS
1669   // Set CMS global values
1670   CompactibleFreeListSpace::set_cms_values();
1671 #endif // INCLUDE_ALL_GCS
1672 }
1673 
1674 size_t Arguments::max_heap_for_compressed_oops() {
1675   // Avoid sign flip.
1676   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1677   // We need to fit both the NULL page and the heap into the memory budget, while
1678   // keeping alignment constraints of the heap. To guarantee the latter, as the
1679   // NULL page is located before the heap, we pad the NULL page to the conservative
1680   // maximum alignment that the GC may ever impose upon the heap.
1681   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1682                                                         _conservative_max_heap_alignment);
1683 
1684   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1685   NOT_LP64(ShouldNotReachHere(); return 0);
1686 }
1687 
1688 void Arguments::set_use_compressed_oops() {
1689 #ifndef ZERO
1690 #ifdef _LP64
1691   // MaxHeapSize is not set up properly at this point, but
1692   // the only value that can override MaxHeapSize if we are
1693   // to use UseCompressedOops is InitialHeapSize.
1694   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1695 
1696   if (max_heap_size <= max_heap_for_compressed_oops()) {
1697 #if !defined(COMPILER1) || defined(TIERED)
1698     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1699       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1700     }
1701 #endif
1702   } else {
1703     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1704       warning("Max heap size too large for Compressed Oops");
1705       FLAG_SET_DEFAULT(UseCompressedOops, false);
1706       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1707     }
1708   }
1709 #endif // _LP64
1710 #endif // ZERO
1711 }
1712 
1713 
1714 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1715 // set_use_compressed_oops().
1716 void Arguments::set_use_compressed_klass_ptrs() {
1717 #ifndef ZERO
1718 #ifdef _LP64
1719   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1720   if (!UseCompressedOops) {
1721     if (UseCompressedClassPointers) {
1722       warning("UseCompressedClassPointers requires UseCompressedOops");
1723     }
1724     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1725   } else {
1726     // Turn on UseCompressedClassPointers too
1727     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1728       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1729     }
1730     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1731     if (UseCompressedClassPointers) {
1732       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1733         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1734         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1735       }
1736     }
1737   }
1738 #endif // _LP64
1739 #endif // !ZERO
1740 }
1741 
1742 void Arguments::set_conservative_max_heap_alignment() {
1743   // The conservative maximum required alignment for the heap is the maximum of
1744   // the alignments imposed by several sources: any requirements from the heap
1745   // itself, the collector policy and the maximum page size we may run the VM
1746   // with.
1747   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1748 #if INCLUDE_ALL_GCS
1749   if (UseParallelGC) {
1750     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1751   } else if (UseG1GC) {
1752     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1753   }
1754 #endif // INCLUDE_ALL_GCS
1755   _conservative_max_heap_alignment = MAX4(heap_alignment,
1756                                           (size_t)os::vm_allocation_granularity(),
1757                                           os::max_page_size(),
1758                                           CollectorPolicy::compute_heap_alignment());
1759 }
1760 
1761 bool Arguments::gc_selected() {
1762 #if INCLUDE_ALL_GCS
1763   return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1764 #else
1765   return UseSerialGC;
1766 #endif // INCLUDE_ALL_GCS
1767 }
1768 
1769 void Arguments::select_gc_ergonomically() {
1770 #if INCLUDE_ALL_GCS
1771   if (os::is_server_class_machine()) {
1772     FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1773   } else {
1774     FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1775   }
1776 #else
1777   UNSUPPORTED_OPTION(UseG1GC);
1778   UNSUPPORTED_OPTION(UseParallelGC);
1779   UNSUPPORTED_OPTION(UseParallelOldGC);
1780   UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1781   FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1782 #endif // INCLUDE_ALL_GCS
1783 }
1784 
1785 void Arguments::select_gc() {
1786   if (!gc_selected()) {
1787     select_gc_ergonomically();
1788     if (!gc_selected()) {
1789       vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1790     }
1791   }
1792 }
1793 
1794 void Arguments::set_ergonomics_flags() {
1795   select_gc();
1796 
1797 #if defined(COMPILER2) || INCLUDE_JVMCI
1798   // Shared spaces work fine with other GCs but causes bytecode rewriting
1799   // to be disabled, which hurts interpreter performance and decreases
1800   // server performance.  When -server is specified, keep the default off
1801   // unless it is asked for.  Future work: either add bytecode rewriting
1802   // at link time, or rewrite bytecodes in non-shared methods.
1803   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1804       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1805     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1806   }
1807 #endif
1808 
1809   set_conservative_max_heap_alignment();
1810 
1811 #ifndef ZERO
1812 #ifdef _LP64
1813   set_use_compressed_oops();
1814 
1815   // set_use_compressed_klass_ptrs() must be called after calling
1816   // set_use_compressed_oops().
1817   set_use_compressed_klass_ptrs();
1818 
1819   // Also checks that certain machines are slower with compressed oops
1820   // in vm_version initialization code.
1821 #endif // _LP64
1822 #endif // !ZERO
1823 
1824 }
1825 
1826 void Arguments::set_parallel_gc_flags() {
1827   assert(UseParallelGC || UseParallelOldGC, "Error");
1828   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1829   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1830     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1831   }
1832   FLAG_SET_DEFAULT(UseParallelGC, true);
1833 
1834   // If no heap maximum was requested explicitly, use some reasonable fraction
1835   // of the physical memory, up to a maximum of 1GB.
1836   FLAG_SET_DEFAULT(ParallelGCThreads,
1837                    Abstract_VM_Version::parallel_worker_threads());
1838   if (ParallelGCThreads == 0) {
1839     jio_fprintf(defaultStream::error_stream(),
1840         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1841     vm_exit(1);
1842   }
1843 
1844   if (UseAdaptiveSizePolicy) {
1845     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1846     // unless the user actually sets these flags.
1847     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1848       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1849     }
1850     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1851       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1852     }
1853   }
1854 
1855   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1856   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1857   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1858   // See CR 6362902 for details.
1859   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1860     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1861        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1862     }
1863     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1864       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1865     }
1866   }
1867 
1868   if (UseParallelOldGC) {
1869     // Par compact uses lower default values since they are treated as
1870     // minimums.  These are different defaults because of the different
1871     // interpretation and are not ergonomically set.
1872     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1873       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1874     }
1875   }
1876 }
1877 
1878 void Arguments::set_g1_gc_flags() {
1879   assert(UseG1GC, "Error");
1880 #if defined(COMPILER1) || INCLUDE_JVMCI
1881   FastTLABRefill = false;
1882 #endif
1883   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1884   if (ParallelGCThreads == 0) {
1885     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1886     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1887   }
1888 
1889 #if INCLUDE_ALL_GCS
1890   if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1891     FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1892   }
1893 #endif
1894 
1895   // MarkStackSize will be set (if it hasn't been set by the user)
1896   // when concurrent marking is initialized.
1897   // Its value will be based upon the number of parallel marking threads.
1898   // But we do set the maximum mark stack size here.
1899   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1900     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1901   }
1902 
1903   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1904     // In G1, we want the default GC overhead goal to be higher than
1905     // it is for PS, or the heap might be expanded too aggressively.
1906     // We set it here to ~8%.
1907     FLAG_SET_DEFAULT(GCTimeRatio, 12);
1908   }
1909 
1910   // Below, we might need to calculate the pause time interval based on
1911   // the pause target. When we do so we are going to give G1 maximum
1912   // flexibility and allow it to do pauses when it needs to. So, we'll
1913   // arrange that the pause interval to be pause time target + 1 to
1914   // ensure that a) the pause time target is maximized with respect to
1915   // the pause interval and b) we maintain the invariant that pause
1916   // time target < pause interval. If the user does not want this
1917   // maximum flexibility, they will have to set the pause interval
1918   // explicitly.
1919 
1920   if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1921     // The default pause time target in G1 is 200ms
1922     FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1923   }
1924 
1925   // Then, if the interval parameter was not set, set it according to
1926   // the pause time target (this will also deal with the case when the
1927   // pause time target is the default value).
1928   if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1929     FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1930   }
1931 
1932   log_trace(gc)("MarkStackSize: %uk  MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1933 }
1934 









1935 void Arguments::set_gc_specific_flags() {
1936 #if INCLUDE_ALL_GCS
1937   // Set per-collector flags
1938   if (UseParallelGC || UseParallelOldGC) {
1939     set_parallel_gc_flags();
1940   } else if (UseConcMarkSweepGC) {
1941     set_cms_and_parnew_gc_flags();
1942   } else if (UseG1GC) {
1943     set_g1_gc_flags();


1944   }
1945   if (AssumeMP && !UseSerialGC) {
1946     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1947       warning("If the number of processors is expected to increase from one, then"
1948               " you should configure the number of parallel GC threads appropriately"
1949               " using -XX:ParallelGCThreads=N");
1950     }
1951   }
1952   if (MinHeapFreeRatio == 100) {
1953     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1954     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1955   }
1956 
1957   // If class unloading is disabled, also disable concurrent class unloading.
1958   if (!ClassUnloading) {
1959     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1960     FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1961   }
1962 #endif // INCLUDE_ALL_GCS
1963 }
1964 
1965 julong Arguments::limit_by_allocatable_memory(julong limit) {
1966   julong max_allocatable;
1967   julong result = limit;
1968   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1969     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1970   }
1971   return result;
1972 }
1973 
1974 // Use static initialization to get the default before parsing
1975 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1976 
1977 void Arguments::set_heap_size() {
1978   julong phys_mem =
1979     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1980                             : (julong)MaxRAM;
1981 
1982   // Experimental support for CGroup memory limits
1983   if (UseCGroupMemoryLimitForHeap) {
1984     // This is a rough indicator that a CGroup limit may be in force
1985     // for this process
1986     const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1987     FILE *fp = fopen(lim_file, "r");
1988     if (fp != NULL) {
1989       julong cgroup_max = 0;
1990       int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1991       if (ret == 1 && cgroup_max > 0) {
1992         // If unlimited, cgroup_max will be a very large, but unspecified
1993         // value, so use initial phys_mem as a limit
1994         log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
1995                            JULONG_FORMAT "MB) and initial phys_mem ("
1996                            JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1997         phys_mem = MIN2(cgroup_max, phys_mem);
1998       } else {
1999         warning("Unable to read/parse cgroup memory limit from %s: %s",
2000                 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2001       }
2002       fclose(fp);
2003     } else {
2004       warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2005     }
2006   }
2007 
2008   // If the maximum heap size has not been set with -Xmx,
2009   // then set it as fraction of the size of physical memory,
2010   // respecting the maximum and minimum sizes of the heap.
2011   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2012     julong reasonable_max = phys_mem / MaxRAMFraction;
2013 
2014     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2015       // Small physical memory, so use a minimum fraction of it for the heap
2016       reasonable_max = phys_mem / MinRAMFraction;
2017     } else {
2018       // Not-small physical memory, so require a heap at least
2019       // as large as MaxHeapSize
2020       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2021     }
2022     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2023       // Limit the heap size to ErgoHeapSizeLimit
2024       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2025     }
2026     if (UseCompressedOops) {
2027       // Limit the heap size to the maximum possible when using compressed oops
2028       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2029 
2030       // HeapBaseMinAddress can be greater than default but not less than.
2031       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2032         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2033           // matches compressed oops printing flags
2034           log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2035                                      " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2036                                      DefaultHeapBaseMinAddress,
2037                                      DefaultHeapBaseMinAddress/G,
2038                                      HeapBaseMinAddress);
2039           FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2040         }
2041       }
2042 
2043       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2044         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2045         // but it should be not less than default MaxHeapSize.
2046         max_coop_heap -= HeapBaseMinAddress;
2047       }
2048       reasonable_max = MIN2(reasonable_max, max_coop_heap);
2049     }
2050     reasonable_max = limit_by_allocatable_memory(reasonable_max);
2051 
2052     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2053       // An initial heap size was specified on the command line,
2054       // so be sure that the maximum size is consistent.  Done
2055       // after call to limit_by_allocatable_memory because that
2056       // method might reduce the allocation size.
2057       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2058     }
2059 
2060     log_trace(gc, heap)("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2061     FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2062   }
2063 
2064   // If the minimum or initial heap_size have not been set or requested to be set
2065   // ergonomically, set them accordingly.
2066   if (InitialHeapSize == 0 || min_heap_size() == 0) {
2067     julong reasonable_minimum = (julong)(OldSize + NewSize);
2068 
2069     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2070 
2071     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2072 
2073     if (InitialHeapSize == 0) {
2074       julong reasonable_initial = phys_mem / InitialRAMFraction;
2075 
2076       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2077       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2078 
2079       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2080 
2081       log_trace(gc, heap)("  Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2082       FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2083     }
2084     // If the minimum heap size has not been set (via -Xms),
2085     // synchronize with InitialHeapSize to avoid errors with the default value.
2086     if (min_heap_size() == 0) {
2087       set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2088       log_trace(gc, heap)("  Minimum heap size " SIZE_FORMAT, min_heap_size());
2089     }
2090   }
2091 }
2092 
2093 // This option inspects the machine and attempts to set various
2094 // parameters to be optimal for long-running, memory allocation
2095 // intensive jobs.  It is intended for machines with large
2096 // amounts of cpu and memory.
2097 jint Arguments::set_aggressive_heap_flags() {
2098   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2099   // VM, but we may not be able to represent the total physical memory
2100   // available (like having 8gb of memory on a box but using a 32bit VM).
2101   // Thus, we need to make sure we're using a julong for intermediate
2102   // calculations.
2103   julong initHeapSize;
2104   julong total_memory = os::physical_memory();
2105 
2106   if (total_memory < (julong) 256 * M) {
2107     jio_fprintf(defaultStream::error_stream(),
2108             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2109     vm_exit(1);
2110   }
2111 
2112   // The heap size is half of available memory, or (at most)
2113   // all of possible memory less 160mb (leaving room for the OS
2114   // when using ISM).  This is the maximum; because adaptive sizing
2115   // is turned on below, the actual space used may be smaller.
2116 
2117   initHeapSize = MIN2(total_memory / (julong) 2,
2118           total_memory - (julong) 160 * M);
2119 
2120   initHeapSize = limit_by_allocatable_memory(initHeapSize);
2121 
2122   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2123     if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2124       return JNI_EINVAL;
2125     }
2126     if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2127       return JNI_EINVAL;
2128     }
2129     // Currently the minimum size and the initial heap sizes are the same.
2130     set_min_heap_size(initHeapSize);
2131   }
2132   if (FLAG_IS_DEFAULT(NewSize)) {
2133     // Make the young generation 3/8ths of the total heap.
2134     if (FLAG_SET_CMDLINE(size_t, NewSize,
2135             ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2136       return JNI_EINVAL;
2137     }
2138     if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2139       return JNI_EINVAL;
2140     }
2141   }
2142 
2143 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
2144   FLAG_SET_DEFAULT(UseLargePages, true);
2145 #endif
2146 
2147   // Increase some data structure sizes for efficiency
2148   if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2149     return JNI_EINVAL;
2150   }
2151   if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2152     return JNI_EINVAL;
2153   }
2154   if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2155     return JNI_EINVAL;
2156   }
2157 
2158   // See the OldPLABSize comment below, but replace 'after promotion'
2159   // with 'after copying'.  YoungPLABSize is the size of the survivor
2160   // space per-gc-thread buffers.  The default is 4kw.
2161   if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2162     return JNI_EINVAL;
2163   }
2164 
2165   // OldPLABSize is the size of the buffers in the old gen that
2166   // UseParallelGC uses to promote live data that doesn't fit in the
2167   // survivor spaces.  At any given time, there's one for each gc thread.
2168   // The default size is 1kw. These buffers are rarely used, since the
2169   // survivor spaces are usually big enough.  For specjbb, however, there
2170   // are occasions when there's lots of live data in the young gen
2171   // and we end up promoting some of it.  We don't have a definite
2172   // explanation for why bumping OldPLABSize helps, but the theory
2173   // is that a bigger PLAB results in retaining something like the
2174   // original allocation order after promotion, which improves mutator
2175   // locality.  A minor effect may be that larger PLABs reduce the
2176   // number of PLAB allocation events during gc.  The value of 8kw
2177   // was arrived at by experimenting with specjbb.
2178   if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2179     return JNI_EINVAL;
2180   }
2181 
2182   // Enable parallel GC and adaptive generation sizing
2183   if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2184     return JNI_EINVAL;
2185   }
2186   FLAG_SET_DEFAULT(ParallelGCThreads,
2187           Abstract_VM_Version::parallel_worker_threads());
2188 
2189   // Encourage steady state memory management
2190   if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2191     return JNI_EINVAL;
2192   }
2193 
2194   // This appears to improve mutator locality
2195   if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2196     return JNI_EINVAL;
2197   }
2198 
2199   // Get around early Solaris scheduling bug
2200   // (affinity vs other jobs on system)
2201   // but disallow DR and offlining (5008695).
2202   if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2203     return JNI_EINVAL;
2204   }
2205 
2206   return JNI_OK;
2207 }
2208 
2209 // This must be called after ergonomics.
2210 void Arguments::set_bytecode_flags() {
2211   if (!RewriteBytecodes) {
2212     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2213   }
2214 }
2215 
2216 // Aggressive optimization flags  -XX:+AggressiveOpts
2217 jint Arguments::set_aggressive_opts_flags() {
2218 #ifdef COMPILER2
2219   if (AggressiveUnboxing) {
2220     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2221       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2222     } else if (!EliminateAutoBox) {
2223       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2224       AggressiveUnboxing = false;
2225     }
2226     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2227       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2228     } else if (!DoEscapeAnalysis) {
2229       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2230       AggressiveUnboxing = false;
2231     }
2232   }
2233   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2234     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2235       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2236     }
2237     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2238       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2239     }
2240 
2241     // Feed the cache size setting into the JDK
2242     char buffer[1024];
2243     jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2244     if (!add_property(buffer)) {
2245       return JNI_ENOMEM;
2246     }
2247   }
2248   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2249     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2250   }
2251 #endif
2252 
2253   if (AggressiveOpts) {
2254 // Sample flag setting code
2255 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2256 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
2257 //    }
2258   }
2259 
2260   return JNI_OK;
2261 }
2262 
2263 //===========================================================================================================
2264 // Parsing of java.compiler property
2265 
2266 void Arguments::process_java_compiler_argument(const char* arg) {
2267   // For backwards compatibility, Djava.compiler=NONE or ""
2268   // causes us to switch to -Xint mode UNLESS -Xdebug
2269   // is also specified.
2270   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2271     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2272   }
2273 }
2274 
2275 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2276   _sun_java_launcher = os::strdup_check_oom(launcher);
2277 }
2278 
2279 bool Arguments::created_by_java_launcher() {
2280   assert(_sun_java_launcher != NULL, "property must have value");
2281   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2282 }
2283 
2284 bool Arguments::sun_java_launcher_is_altjvm() {
2285   return _sun_java_launcher_is_altjvm;
2286 }
2287 
2288 //===========================================================================================================
2289 // Parsing of main arguments
2290 
2291 #if INCLUDE_JVMCI
2292 // Check consistency of jvmci vm argument settings.
2293 bool Arguments::check_jvmci_args_consistency() {
2294    return JVMCIGlobals::check_jvmci_flags_are_consistent();
2295 }
2296 #endif //INCLUDE_JVMCI
2297 
2298 // Check consistency of GC selection
2299 bool Arguments::check_gc_consistency() {
2300   // Ensure that the user has not selected conflicting sets
2301   // of collectors.
2302   uint i = 0;
2303   if (UseSerialGC)                       i++;
2304   if (UseConcMarkSweepGC)                i++;
2305   if (UseParallelGC || UseParallelOldGC) i++;
2306   if (UseG1GC)                           i++;

2307   if (i > 1) {
2308     jio_fprintf(defaultStream::error_stream(),
2309                 "Conflicting collector combinations in option list; "
2310                 "please refer to the release notes for the combinations "
2311                 "allowed\n");
2312     return false;
2313   }
2314 
2315   return true;
2316 }
2317 
2318 // Check the consistency of vm_init_args
2319 bool Arguments::check_vm_args_consistency() {
2320   // Method for adding checks for flag consistency.
2321   // The intent is to warn the user of all possible conflicts,
2322   // before returning an error.
2323   // Note: Needs platform-dependent factoring.
2324   bool status = true;
2325 
2326   if (TLABRefillWasteFraction == 0) {
2327     jio_fprintf(defaultStream::error_stream(),
2328                 "TLABRefillWasteFraction should be a denominator, "
2329                 "not " SIZE_FORMAT "\n",
2330                 TLABRefillWasteFraction);
2331     status = false;
2332   }
2333 
2334   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2335     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2336   }
2337 
2338   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2339     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2340   }
2341 
2342   if (GCTimeLimit == 100) {
2343     // Turn off gc-overhead-limit-exceeded checks
2344     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2345   }
2346 
2347   status = status && check_gc_consistency();
2348 
2349   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2350   // insists that we hold the requisite locks so that the iteration is
2351   // MT-safe. For the verification at start-up and shut-down, we don't
2352   // yet have a good way of acquiring and releasing these locks,
2353   // which are not visible at the CollectedHeap level. We want to
2354   // be able to acquire these locks and then do the iteration rather
2355   // than just disable the lock verification. This will be fixed under
2356   // bug 4788986.
2357   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2358     if (VerifyDuringStartup) {
2359       warning("Heap verification at start-up disabled "
2360               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2361       VerifyDuringStartup = false; // Disable verification at start-up
2362     }
2363 
2364     if (VerifyBeforeExit) {
2365       warning("Heap verification at shutdown disabled "
2366               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2367       VerifyBeforeExit = false; // Disable verification at shutdown
2368     }
2369   }
2370 
2371   if (PrintNMTStatistics) {
2372 #if INCLUDE_NMT
2373     if (MemTracker::tracking_level() == NMT_off) {
2374 #endif // INCLUDE_NMT
2375       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2376       PrintNMTStatistics = false;
2377 #if INCLUDE_NMT
2378     }
2379 #endif
2380   }
2381 #if INCLUDE_JVMCI
2382 
2383   status = status && check_jvmci_args_consistency();
2384 
2385   if (EnableJVMCI) {
2386     if (!ScavengeRootsInCode) {
2387       warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2388       ScavengeRootsInCode = 1;
2389     }
2390     if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2391       TypeProfileLevel = 0;
2392     }
2393     if (UseJVMCICompiler) {
2394       if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2395         TypeProfileWidth = 8;
2396       }
2397     }
2398   }
2399 #endif
2400 
2401   // Check lower bounds of the code cache
2402   // Template Interpreter code is approximately 3X larger in debug builds.
2403   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2404   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2405     jio_fprintf(defaultStream::error_stream(),
2406                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2407                 os::vm_page_size()/K);
2408     status = false;
2409   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2410     jio_fprintf(defaultStream::error_stream(),
2411                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2412                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2413     status = false;
2414   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2415     jio_fprintf(defaultStream::error_stream(),
2416                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2417                 min_code_cache_size/K);
2418     status = false;
2419   } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2420     // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2421     jio_fprintf(defaultStream::error_stream(),
2422                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2423                 CODE_CACHE_SIZE_LIMIT/M);
2424     status = false;
2425   } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2426     jio_fprintf(defaultStream::error_stream(),
2427                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2428                 min_code_cache_size/K);
2429     status = false;
2430   }
2431 
2432 #ifdef _LP64
2433   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2434     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2435   }
2436 #endif
2437 
2438 #ifndef SUPPORT_RESERVED_STACK_AREA
2439   if (StackReservedPages != 0) {
2440     FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2441     warning("Reserved Stack Area not supported on this platform");
2442   }
2443 #endif
2444 
2445   if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2446     if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2447       warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2448     }
2449     FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2450   }
2451   if (UseCompiler && is_interpreter_only()) {
2452     if (!FLAG_IS_DEFAULT(UseCompiler)) {
2453       warning("UseCompiler disabled due to -Xint.");
2454     }
2455     FLAG_SET_CMDLINE(bool, UseCompiler, false);
2456   }
2457 #ifdef COMPILER2
2458   if (PostLoopMultiversioning && !RangeCheckElimination) {
2459     if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2460       warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2461     }
2462     FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2463   }
2464 #endif
2465   return status;
2466 }
2467 
2468 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2469   const char* option_type) {
2470   if (ignore) return false;
2471 
2472   const char* spacer = " ";
2473   if (option_type == NULL) {
2474     option_type = ++spacer; // Set both to the empty string.
2475   }
2476 
2477   if (os::obsolete_option(option)) {
2478     jio_fprintf(defaultStream::error_stream(),
2479                 "Obsolete %s%soption: %s\n", option_type, spacer,
2480       option->optionString);
2481     return false;
2482   } else {
2483     jio_fprintf(defaultStream::error_stream(),
2484                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2485       option->optionString);
2486     return true;
2487   }
2488 }
2489 
2490 static const char* user_assertion_options[] = {
2491   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2492 };
2493 
2494 static const char* system_assertion_options[] = {
2495   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2496 };
2497 
2498 bool Arguments::parse_uintx(const char* value,
2499                             uintx* uintx_arg,
2500                             uintx min_size) {
2501 
2502   // Check the sign first since atojulong() parses only unsigned values.
2503   bool value_is_positive = !(*value == '-');
2504 
2505   if (value_is_positive) {
2506     julong n;
2507     bool good_return = atojulong(value, &n);
2508     if (good_return) {
2509       bool above_minimum = n >= min_size;
2510       bool value_is_too_large = n > max_uintx;
2511 
2512       if (above_minimum && !value_is_too_large) {
2513         *uintx_arg = n;
2514         return true;
2515       }
2516     }
2517   }
2518   return false;
2519 }
2520 
2521 unsigned int addreads_count = 0;
2522 unsigned int addexports_count = 0;
2523 unsigned int addopens_count = 0;
2524 unsigned int addmods_count = 0;
2525 unsigned int patch_mod_count = 0;
2526 
2527 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2528   size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2529   char* property = AllocateHeap(prop_len, mtArguments);
2530   int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2531   if (ret < 0 || ret >= (int)prop_len) {
2532     FreeHeap(property);
2533     return false;
2534   }
2535   bool added = add_property(property, UnwriteableProperty, internal);
2536   FreeHeap(property);
2537   return added;
2538 }
2539 
2540 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2541   // Make sure count is < 1,000. Otherwise, memory allocation will be too small.
2542   if (count < 1000) {
2543     size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + 5;
2544     char* property = AllocateHeap(prop_len, mtArguments);
2545     int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2546     if (ret < 0 || ret >= (int)prop_len) {
2547       FreeHeap(property);
2548       return false;
2549     }
2550     bool added = add_property(property, UnwriteableProperty, InternalProperty);
2551     FreeHeap(property);
2552     return added;
2553   }
2554   return false;
2555 }
2556 
2557 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2558                                                   julong* long_arg,
2559                                                   julong min_size) {
2560   if (!atojulong(s, long_arg)) return arg_unreadable;
2561   return check_memory_size(*long_arg, min_size);
2562 }
2563 
2564 // Parse JavaVMInitArgs structure
2565 
2566 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2567                                    const JavaVMInitArgs *java_options_args,
2568                                    const JavaVMInitArgs *cmd_line_args) {
2569   bool patch_mod_javabase = false;
2570 
2571   // Save default settings for some mode flags
2572   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2573   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2574   Arguments::_ClipInlining             = ClipInlining;
2575   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2576   if (TieredCompilation) {
2577     Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2578     Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2579   }
2580 
2581   // Setup flags for mixed which is the default
2582   set_mode_flags(_mixed);
2583 
2584   // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2585   // variable (if present).
2586   jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2587   if (result != JNI_OK) {
2588     return result;
2589   }
2590 
2591   // Parse args structure generated from the command line flags.
2592   result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2593   if (result != JNI_OK) {
2594     return result;
2595   }
2596 
2597   // Parse args structure generated from the _JAVA_OPTIONS environment
2598   // variable (if present) (mimics classic VM)
2599   result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2600   if (result != JNI_OK) {
2601     return result;
2602   }
2603 
2604   // Do final processing now that all arguments have been parsed
2605   result = finalize_vm_init_args();
2606   if (result != JNI_OK) {
2607     return result;
2608   }
2609 
2610 #if INCLUDE_CDS
2611   if (UseSharedSpaces && patch_mod_javabase) {
2612     no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2613   }
2614 #endif
2615 
2616   return JNI_OK;
2617 }
2618 
2619 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2620 // represents a valid JDWP agent.  is_path==true denotes that we
2621 // are dealing with -agentpath (case where name is a path), otherwise with
2622 // -agentlib
2623 bool valid_jdwp_agent(char *name, bool is_path) {
2624   char *_name;
2625   const char *_jdwp = "jdwp";
2626   size_t _len_jdwp, _len_prefix;
2627 
2628   if (is_path) {
2629     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2630       return false;
2631     }
2632 
2633     _name++;  // skip past last path separator
2634     _len_prefix = strlen(JNI_LIB_PREFIX);
2635 
2636     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2637       return false;
2638     }
2639 
2640     _name += _len_prefix;
2641     _len_jdwp = strlen(_jdwp);
2642 
2643     if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2644       _name += _len_jdwp;
2645     }
2646     else {
2647       return false;
2648     }
2649 
2650     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2651       return false;
2652     }
2653 
2654     return true;
2655   }
2656 
2657   if (strcmp(name, _jdwp) == 0) {
2658     return true;
2659   }
2660 
2661   return false;
2662 }
2663 
2664 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2665   // --patch-module=<module>=<file>(<pathsep><file>)*
2666   assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2667   // Find the equal sign between the module name and the path specification
2668   const char* module_equal = strchr(patch_mod_tail, '=');
2669   if (module_equal == NULL) {
2670     jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2671     return JNI_ERR;
2672   } else {
2673     // Pick out the module name
2674     size_t module_len = module_equal - patch_mod_tail;
2675     char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2676     if (module_name != NULL) {
2677       memcpy(module_name, patch_mod_tail, module_len);
2678       *(module_name + module_len) = '\0';
2679       // The path piece begins one past the module_equal sign
2680       add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2681       FREE_C_HEAP_ARRAY(char, module_name);
2682       if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2683         return JNI_ENOMEM;
2684       }
2685     } else {
2686       return JNI_ENOMEM;
2687     }
2688   }
2689   return JNI_OK;
2690 }
2691 
2692 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2693   // For match_option to return remaining or value part of option string
2694   const char* tail;
2695 
2696   // iterate over arguments
2697   for (int index = 0; index < args->nOptions; index++) {
2698     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2699 
2700     const JavaVMOption* option = args->options + index;
2701 
2702     if (!match_option(option, "-Djava.class.path", &tail) &&
2703         !match_option(option, "-Dsun.java.command", &tail) &&
2704         !match_option(option, "-Dsun.java.launcher", &tail)) {
2705 
2706         // add all jvm options to the jvm_args string. This string
2707         // is used later to set the java.vm.args PerfData string constant.
2708         // the -Djava.class.path and the -Dsun.java.command options are
2709         // omitted from jvm_args string as each have their own PerfData
2710         // string constant object.
2711         build_jvm_args(option->optionString);
2712     }
2713 
2714     // -verbose:[class/gc/jni]
2715     if (match_option(option, "-verbose", &tail)) {
2716       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2717         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2718         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2719       } else if (!strcmp(tail, ":gc")) {
2720         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2721       } else if (!strcmp(tail, ":jni")) {
2722         if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2723           return JNI_EINVAL;
2724         }
2725       }
2726     // -da / -ea / -disableassertions / -enableassertions
2727     // These accept an optional class/package name separated by a colon, e.g.,
2728     // -da:java.lang.Thread.
2729     } else if (match_option(option, user_assertion_options, &tail, true)) {
2730       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2731       if (*tail == '\0') {
2732         JavaAssertions::setUserClassDefault(enable);
2733       } else {
2734         assert(*tail == ':', "bogus match by match_option()");
2735         JavaAssertions::addOption(tail + 1, enable);
2736       }
2737     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2738     } else if (match_option(option, system_assertion_options, &tail, false)) {
2739       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2740       JavaAssertions::setSystemClassDefault(enable);
2741     // -bootclasspath:
2742     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2743         jio_fprintf(defaultStream::output_stream(),
2744           "-Xbootclasspath is no longer a supported option.\n");
2745         return JNI_EINVAL;
2746     // -bootclasspath/a:
2747     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2748       Arguments::append_sysclasspath(tail);
2749     // -bootclasspath/p:
2750     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2751         jio_fprintf(defaultStream::output_stream(),
2752           "-Xbootclasspath/p is no longer a supported option.\n");
2753         return JNI_EINVAL;
2754     // -Xrun
2755     } else if (match_option(option, "-Xrun", &tail)) {
2756       if (tail != NULL) {
2757         const char* pos = strchr(tail, ':');
2758         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2759         char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2760         jio_snprintf(name, len + 1, "%s", tail);
2761 
2762         char *options = NULL;
2763         if(pos != NULL) {
2764           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2765           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2766         }
2767 #if !INCLUDE_JVMTI
2768         if (strcmp(name, "jdwp") == 0) {
2769           jio_fprintf(defaultStream::error_stream(),
2770             "Debugging agents are not supported in this VM\n");
2771           return JNI_ERR;
2772         }
2773 #endif // !INCLUDE_JVMTI
2774         add_init_library(name, options);
2775       }
2776     } else if (match_option(option, "--add-reads=", &tail)) {
2777       if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2778         return JNI_ENOMEM;
2779       }
2780     } else if (match_option(option, "--add-exports=", &tail)) {
2781       if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2782         return JNI_ENOMEM;
2783       }
2784     } else if (match_option(option, "--add-opens=", &tail)) {
2785       if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2786         return JNI_ENOMEM;
2787       }
2788     } else if (match_option(option, "--add-modules=", &tail)) {
2789       if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2790         return JNI_ENOMEM;
2791       }
2792     } else if (match_option(option, "--limit-modules=", &tail)) {
2793       if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2794         return JNI_ENOMEM;
2795       }
2796     } else if (match_option(option, "--module-path=", &tail)) {
2797       if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2798         return JNI_ENOMEM;
2799       }
2800     } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2801       if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2802         return JNI_ENOMEM;
2803       }
2804     } else if (match_option(option, "--patch-module=", &tail)) {
2805       // --patch-module=<module>=<file>(<pathsep><file>)*
2806       int res = process_patch_mod_option(tail, patch_mod_javabase);
2807       if (res != JNI_OK) {
2808         return res;
2809       }
2810     // -agentlib and -agentpath
2811     } else if (match_option(option, "-agentlib:", &tail) ||
2812           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2813       if(tail != NULL) {
2814         const char* pos = strchr(tail, '=');
2815         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2816         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2817         name[len] = '\0';
2818 
2819         char *options = NULL;
2820         if(pos != NULL) {
2821           options = os::strdup_check_oom(pos + 1, mtArguments);
2822         }
2823 #if !INCLUDE_JVMTI
2824         if (valid_jdwp_agent(name, is_absolute_path)) {
2825           jio_fprintf(defaultStream::error_stream(),
2826             "Debugging agents are not supported in this VM\n");
2827           return JNI_ERR;
2828         }
2829 #endif // !INCLUDE_JVMTI
2830         add_init_agent(name, options, is_absolute_path);
2831       }
2832     // -javaagent
2833     } else if (match_option(option, "-javaagent:", &tail)) {
2834 #if !INCLUDE_JVMTI
2835       jio_fprintf(defaultStream::error_stream(),
2836         "Instrumentation agents are not supported in this VM\n");
2837       return JNI_ERR;
2838 #else
2839       if (tail != NULL) {
2840         size_t length = strlen(tail) + 1;
2841         char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2842         jio_snprintf(options, length, "%s", tail);
2843         add_init_agent("instrument", options, false);
2844         // java agents need module java.instrument
2845         if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2846           return JNI_ENOMEM;
2847         }
2848       }
2849 #endif // !INCLUDE_JVMTI
2850     // -Xnoclassgc
2851     } else if (match_option(option, "-Xnoclassgc")) {
2852       if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2853         return JNI_EINVAL;
2854       }
2855     // -Xconcgc
2856     } else if (match_option(option, "-Xconcgc")) {
2857       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2858         return JNI_EINVAL;
2859       }
2860       handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2861     // -Xnoconcgc
2862     } else if (match_option(option, "-Xnoconcgc")) {
2863       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2864         return JNI_EINVAL;
2865       }
2866       handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2867     // -Xbatch
2868     } else if (match_option(option, "-Xbatch")) {
2869       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2870         return JNI_EINVAL;
2871       }
2872     // -Xmn for compatibility with other JVM vendors
2873     } else if (match_option(option, "-Xmn", &tail)) {
2874       julong long_initial_young_size = 0;
2875       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2876       if (errcode != arg_in_range) {
2877         jio_fprintf(defaultStream::error_stream(),
2878                     "Invalid initial young generation size: %s\n", option->optionString);
2879         describe_range_error(errcode);
2880         return JNI_EINVAL;
2881       }
2882       if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2883         return JNI_EINVAL;
2884       }
2885       if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2886         return JNI_EINVAL;
2887       }
2888     // -Xms
2889     } else if (match_option(option, "-Xms", &tail)) {
2890       julong long_initial_heap_size = 0;
2891       // an initial heap size of 0 means automatically determine
2892       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2893       if (errcode != arg_in_range) {
2894         jio_fprintf(defaultStream::error_stream(),
2895                     "Invalid initial heap size: %s\n", option->optionString);
2896         describe_range_error(errcode);
2897         return JNI_EINVAL;
2898       }
2899       set_min_heap_size((size_t)long_initial_heap_size);
2900       // Currently the minimum size and the initial heap sizes are the same.
2901       // Can be overridden with -XX:InitialHeapSize.
2902       if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2903         return JNI_EINVAL;
2904       }
2905     // -Xmx
2906     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2907       julong long_max_heap_size = 0;
2908       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2909       if (errcode != arg_in_range) {
2910         jio_fprintf(defaultStream::error_stream(),
2911                     "Invalid maximum heap size: %s\n", option->optionString);
2912         describe_range_error(errcode);
2913         return JNI_EINVAL;
2914       }
2915       if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2916         return JNI_EINVAL;
2917       }
2918     // Xmaxf
2919     } else if (match_option(option, "-Xmaxf", &tail)) {
2920       char* err;
2921       int maxf = (int)(strtod(tail, &err) * 100);
2922       if (*err != '\0' || *tail == '\0') {
2923         jio_fprintf(defaultStream::error_stream(),
2924                     "Bad max heap free percentage size: %s\n",
2925                     option->optionString);
2926         return JNI_EINVAL;
2927       } else {
2928         if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2929             return JNI_EINVAL;
2930         }
2931       }
2932     // Xminf
2933     } else if (match_option(option, "-Xminf", &tail)) {
2934       char* err;
2935       int minf = (int)(strtod(tail, &err) * 100);
2936       if (*err != '\0' || *tail == '\0') {
2937         jio_fprintf(defaultStream::error_stream(),
2938                     "Bad min heap free percentage size: %s\n",
2939                     option->optionString);
2940         return JNI_EINVAL;
2941       } else {
2942         if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2943           return JNI_EINVAL;
2944         }
2945       }
2946     // -Xss
2947     } else if (match_option(option, "-Xss", &tail)) {
2948       julong long_ThreadStackSize = 0;
2949       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2950       if (errcode != arg_in_range) {
2951         jio_fprintf(defaultStream::error_stream(),
2952                     "Invalid thread stack size: %s\n", option->optionString);
2953         describe_range_error(errcode);
2954         return JNI_EINVAL;
2955       }
2956       // Internally track ThreadStackSize in units of 1024 bytes.
2957       if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2958                        round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2959         return JNI_EINVAL;
2960       }
2961     // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2962     } else if (match_option(option, "-Xoss", &tail) ||
2963                match_option(option, "-Xsqnopause") ||
2964                match_option(option, "-Xoptimize") ||
2965                match_option(option, "-Xboundthreads") ||
2966                match_option(option, "-Xusealtsigs")) {
2967       // All these options are deprecated in JDK 9 and will be removed in a future release
2968       char version[256];
2969       JDK_Version::jdk(9).to_string(version, sizeof(version));
2970       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2971     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2972       julong long_CodeCacheExpansionSize = 0;
2973       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2974       if (errcode != arg_in_range) {
2975         jio_fprintf(defaultStream::error_stream(),
2976                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2977                    os::vm_page_size()/K);
2978         return JNI_EINVAL;
2979       }
2980       if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2981         return JNI_EINVAL;
2982       }
2983     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2984                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2985       julong long_ReservedCodeCacheSize = 0;
2986 
2987       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2988       if (errcode != arg_in_range) {
2989         jio_fprintf(defaultStream::error_stream(),
2990                     "Invalid maximum code cache size: %s.\n", option->optionString);
2991         return JNI_EINVAL;
2992       }
2993       if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2994         return JNI_EINVAL;
2995       }
2996       // -XX:NonNMethodCodeHeapSize=
2997     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2998       julong long_NonNMethodCodeHeapSize = 0;
2999 
3000       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3001       if (errcode != arg_in_range) {
3002         jio_fprintf(defaultStream::error_stream(),
3003                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3004         return JNI_EINVAL;
3005       }
3006       if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3007         return JNI_EINVAL;
3008       }
3009       // -XX:ProfiledCodeHeapSize=
3010     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3011       julong long_ProfiledCodeHeapSize = 0;
3012 
3013       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3014       if (errcode != arg_in_range) {
3015         jio_fprintf(defaultStream::error_stream(),
3016                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3017         return JNI_EINVAL;
3018       }
3019       if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3020         return JNI_EINVAL;
3021       }
3022       // -XX:NonProfiledCodeHeapSizee=
3023     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3024       julong long_NonProfiledCodeHeapSize = 0;
3025 
3026       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3027       if (errcode != arg_in_range) {
3028         jio_fprintf(defaultStream::error_stream(),
3029                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3030         return JNI_EINVAL;
3031       }
3032       if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3033         return JNI_EINVAL;
3034       }
3035     // -green
3036     } else if (match_option(option, "-green")) {
3037       jio_fprintf(defaultStream::error_stream(),
3038                   "Green threads support not available\n");
3039           return JNI_EINVAL;
3040     // -native
3041     } else if (match_option(option, "-native")) {
3042           // HotSpot always uses native threads, ignore silently for compatibility
3043     // -Xrs
3044     } else if (match_option(option, "-Xrs")) {
3045           // Classic/EVM option, new functionality
3046       if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3047         return JNI_EINVAL;
3048       }
3049     // -Xprof
3050     } else if (match_option(option, "-Xprof")) {
3051 #if INCLUDE_FPROF
3052       _has_profile = true;
3053 #else // INCLUDE_FPROF
3054       jio_fprintf(defaultStream::error_stream(),
3055         "Flat profiling is not supported in this VM.\n");
3056       return JNI_ERR;
3057 #endif // INCLUDE_FPROF
3058     // -Xconcurrentio
3059     } else if (match_option(option, "-Xconcurrentio")) {
3060       if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3061         return JNI_EINVAL;
3062       }
3063       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3064         return JNI_EINVAL;
3065       }
3066       if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3067         return JNI_EINVAL;
3068       }
3069       if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3070         return JNI_EINVAL;
3071       }
3072       if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) {  // 20Kb per thread added to new generation
3073         return JNI_EINVAL;
3074       }
3075 
3076       // -Xinternalversion
3077     } else if (match_option(option, "-Xinternalversion")) {
3078       jio_fprintf(defaultStream::output_stream(), "%s\n",
3079                   VM_Version::internal_vm_info_string());
3080       vm_exit(0);
3081 #ifndef PRODUCT
3082     // -Xprintflags
3083     } else if (match_option(option, "-Xprintflags")) {
3084       CommandLineFlags::printFlags(tty, false);
3085       vm_exit(0);
3086 #endif
3087     // -D
3088     } else if (match_option(option, "-D", &tail)) {
3089       const char* value;
3090       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3091             *value!= '\0' && strcmp(value, "\"\"") != 0) {
3092         // abort if -Djava.endorsed.dirs is set
3093         jio_fprintf(defaultStream::output_stream(),
3094           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3095           "in modular form will be supported via the concept of upgradeable modules.\n", value);
3096         return JNI_EINVAL;
3097       }
3098       if (match_option(option, "-Djava.ext.dirs=", &value) &&
3099             *value != '\0' && strcmp(value, "\"\"") != 0) {
3100         // abort if -Djava.ext.dirs is set
3101         jio_fprintf(defaultStream::output_stream(),
3102           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
3103         return JNI_EINVAL;
3104       }
3105       // Check for module related properties.  They must be set using the modules
3106       // options. For example: use "--add-modules=java.sql", not
3107       // "-Djdk.module.addmods=java.sql"
3108       if (is_internal_module_property(option->optionString + 2)) {
3109         needs_module_property_warning = true;
3110         continue;
3111       }
3112 
3113       if (!add_property(tail)) {
3114         return JNI_ENOMEM;
3115       }
3116       // Out of the box management support
3117       if (match_option(option, "-Dcom.sun.management", &tail)) {
3118 #if INCLUDE_MANAGEMENT
3119         if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3120           return JNI_EINVAL;
3121         }
3122         // management agent in module java.management
3123         if (!create_numbered_property("jdk.module.addmods", "java.management", addmods_count++)) {
3124           return JNI_ENOMEM;
3125         }
3126 #else
3127         jio_fprintf(defaultStream::output_stream(),
3128           "-Dcom.sun.management is not supported in this VM.\n");
3129         return JNI_ERR;
3130 #endif
3131       }
3132     // -Xint
3133     } else if (match_option(option, "-Xint")) {
3134           set_mode_flags(_int);
3135     // -Xmixed
3136     } else if (match_option(option, "-Xmixed")) {
3137           set_mode_flags(_mixed);
3138     // -Xcomp
3139     } else if (match_option(option, "-Xcomp")) {
3140       // for testing the compiler; turn off all flags that inhibit compilation
3141           set_mode_flags(_comp);
3142     // -Xshare:dump
3143     } else if (match_option(option, "-Xshare:dump")) {
3144       if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3145         return JNI_EINVAL;
3146       }
3147       set_mode_flags(_int);     // Prevent compilation, which creates objects
3148     // -Xshare:on
3149     } else if (match_option(option, "-Xshare:on")) {
3150       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3151         return JNI_EINVAL;
3152       }
3153       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3154         return JNI_EINVAL;
3155       }
3156     // -Xshare:auto
3157     } else if (match_option(option, "-Xshare:auto")) {
3158       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3159         return JNI_EINVAL;
3160       }
3161       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3162         return JNI_EINVAL;
3163       }
3164     // -Xshare:off
3165     } else if (match_option(option, "-Xshare:off")) {
3166       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3167         return JNI_EINVAL;
3168       }
3169       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3170         return JNI_EINVAL;
3171       }
3172     // -Xverify
3173     } else if (match_option(option, "-Xverify", &tail)) {
3174       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3175         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3176           return JNI_EINVAL;
3177         }
3178         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3179           return JNI_EINVAL;
3180         }
3181       } else if (strcmp(tail, ":remote") == 0) {
3182         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3183           return JNI_EINVAL;
3184         }
3185         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3186           return JNI_EINVAL;
3187         }
3188       } else if (strcmp(tail, ":none") == 0) {
3189         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3190           return JNI_EINVAL;
3191         }
3192         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3193           return JNI_EINVAL;
3194         }
3195       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3196         return JNI_EINVAL;
3197       }
3198     // -Xdebug
3199     } else if (match_option(option, "-Xdebug")) {
3200       // note this flag has been used, then ignore
3201       set_xdebug_mode(true);
3202     // -Xnoagent
3203     } else if (match_option(option, "-Xnoagent")) {
3204       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3205     } else if (match_option(option, "-Xloggc:", &tail)) {
3206       // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3207       log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3208       _gc_log_filename = os::strdup_check_oom(tail);
3209     } else if (match_option(option, "-Xlog", &tail)) {
3210       bool ret = false;
3211       if (strcmp(tail, ":help") == 0) {
3212         LogConfiguration::print_command_line_help(defaultStream::output_stream());
3213         vm_exit(0);
3214       } else if (strcmp(tail, ":disable") == 0) {
3215         LogConfiguration::disable_logging();
3216         ret = true;
3217       } else if (*tail == '\0') {
3218         ret = LogConfiguration::parse_command_line_arguments();
3219         assert(ret, "-Xlog without arguments should never fail to parse");
3220       } else if (*tail == ':') {
3221         ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3222       }
3223       if (ret == false) {
3224         jio_fprintf(defaultStream::error_stream(),
3225                     "Invalid -Xlog option '-Xlog%s'\n",
3226                     tail);
3227         return JNI_EINVAL;
3228       }
3229     // JNI hooks
3230     } else if (match_option(option, "-Xcheck", &tail)) {
3231       if (!strcmp(tail, ":jni")) {
3232 #if !INCLUDE_JNI_CHECK
3233         warning("JNI CHECKING is not supported in this VM");
3234 #else
3235         CheckJNICalls = true;
3236 #endif // INCLUDE_JNI_CHECK
3237       } else if (is_bad_option(option, args->ignoreUnrecognized,
3238                                      "check")) {
3239         return JNI_EINVAL;
3240       }
3241     } else if (match_option(option, "vfprintf")) {
3242       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3243     } else if (match_option(option, "exit")) {
3244       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3245     } else if (match_option(option, "abort")) {
3246       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3247     // -XX:+AggressiveHeap
3248     } else if (match_option(option, "-XX:+AggressiveHeap")) {
3249       jint result = set_aggressive_heap_flags();
3250       if (result != JNI_OK) {
3251           return result;
3252       }
3253     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3254     // and the last option wins.
3255     } else if (match_option(option, "-XX:+NeverTenure")) {
3256       if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3257         return JNI_EINVAL;
3258       }
3259       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3260         return JNI_EINVAL;
3261       }
3262       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3263         return JNI_EINVAL;
3264       }
3265     } else if (match_option(option, "-XX:+AlwaysTenure")) {
3266       if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3267         return JNI_EINVAL;
3268       }
3269       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3270         return JNI_EINVAL;
3271       }
3272       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3273         return JNI_EINVAL;
3274       }
3275     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3276       uintx max_tenuring_thresh = 0;
3277       if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3278         jio_fprintf(defaultStream::error_stream(),
3279                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3280         return JNI_EINVAL;
3281       }
3282 
3283       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3284         return JNI_EINVAL;
3285       }
3286 
3287       if (MaxTenuringThreshold == 0) {
3288         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3289           return JNI_EINVAL;
3290         }
3291         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3292           return JNI_EINVAL;
3293         }
3294       } else {
3295         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3296           return JNI_EINVAL;
3297         }
3298         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3299           return JNI_EINVAL;
3300         }
3301       }
3302     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3303       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3304         return JNI_EINVAL;
3305       }
3306       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3307         return JNI_EINVAL;
3308       }
3309     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3310       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3311         return JNI_EINVAL;
3312       }
3313       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3314         return JNI_EINVAL;
3315       }
3316     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3317 #if defined(DTRACE_ENABLED)
3318       if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3319         return JNI_EINVAL;
3320       }
3321       if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3322         return JNI_EINVAL;
3323       }
3324       if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3325         return JNI_EINVAL;
3326       }
3327       if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3328         return JNI_EINVAL;
3329       }
3330 #else // defined(DTRACE_ENABLED)
3331       jio_fprintf(defaultStream::error_stream(),
3332                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3333       return JNI_EINVAL;
3334 #endif // defined(DTRACE_ENABLED)
3335 #ifdef ASSERT
3336     } else if (match_option(option, "-XX:+FullGCALot")) {
3337       if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3338         return JNI_EINVAL;
3339       }
3340       // disable scavenge before parallel mark-compact
3341       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3342         return JNI_EINVAL;
3343       }
3344 #endif
3345 #if !INCLUDE_MANAGEMENT
3346     } else if (match_option(option, "-XX:+ManagementServer")) {
3347         jio_fprintf(defaultStream::error_stream(),
3348           "ManagementServer is not supported in this VM.\n");
3349         return JNI_ERR;
3350 #endif // INCLUDE_MANAGEMENT
3351     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3352       // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3353       // already been handled
3354       if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3355           (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3356         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3357           return JNI_EINVAL;
3358         }
3359       }
3360     // Unknown option
3361     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3362       return JNI_ERR;
3363     }
3364   }
3365 
3366   // PrintSharedArchiveAndExit will turn on
3367   //   -Xshare:on
3368   //   -Xlog:class+path=info
3369   if (PrintSharedArchiveAndExit) {
3370     if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3371       return JNI_EINVAL;
3372     }
3373     if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3374       return JNI_EINVAL;
3375     }
3376     LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3377   }
3378 
3379   // Change the default value for flags  which have different default values
3380   // when working with older JDKs.
3381 #ifdef LINUX
3382  if (JDK_Version::current().compare_major(6) <= 0 &&
3383       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3384     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3385   }
3386 #endif // LINUX
3387   fix_appclasspath();
3388   return JNI_OK;
3389 }
3390 
3391 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3392   // For java.base check for duplicate --patch-module options being specified on the command line.
3393   // This check is only required for java.base, all other duplicate module specifications
3394   // will be checked during module system initialization.  The module system initialization
3395   // will throw an ExceptionInInitializerError if this situation occurs.
3396   if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3397     if (*patch_mod_javabase) {
3398       vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3399     } else {
3400       *patch_mod_javabase = true;
3401     }
3402   }
3403 
3404   // Create GrowableArray lazily, only if --patch-module has been specified
3405   if (_patch_mod_prefix == NULL) {
3406     _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3407   }
3408 
3409   _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3410 }
3411 
3412 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3413 //
3414 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3415 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3416 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3417 // path is treated as the current directory.
3418 //
3419 // This causes problems with CDS, which requires that all directories specified in the classpath
3420 // must be empty. In most cases, applications do NOT want to load classes from the current
3421 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3422 // scripts compatible with CDS.
3423 void Arguments::fix_appclasspath() {
3424   if (IgnoreEmptyClassPaths) {
3425     const char separator = *os::path_separator();
3426     const char* src = _java_class_path->value();
3427 
3428     // skip over all the leading empty paths
3429     while (*src == separator) {
3430       src ++;
3431     }
3432 
3433     char* copy = os::strdup_check_oom(src, mtArguments);
3434 
3435     // trim all trailing empty paths
3436     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3437       *tail = '\0';
3438     }
3439 
3440     char from[3] = {separator, separator, '\0'};
3441     char to  [2] = {separator, '\0'};
3442     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3443       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3444       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3445     }
3446 
3447     _java_class_path->set_writeable_value(copy);
3448     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3449   }
3450 }
3451 
3452 static bool has_jar_files(const char* directory) {
3453   DIR* dir = os::opendir(directory);
3454   if (dir == NULL) return false;
3455 
3456   struct dirent *entry;
3457   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3458   bool hasJarFile = false;
3459   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3460     const char* name = entry->d_name;
3461     const char* ext = name + strlen(name) - 4;
3462     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3463   }
3464   FREE_C_HEAP_ARRAY(char, dbuf);
3465   os::closedir(dir);
3466   return hasJarFile ;
3467 }
3468 
3469 static int check_non_empty_dirs(const char* path) {
3470   const char separator = *os::path_separator();
3471   const char* const end = path + strlen(path);
3472   int nonEmptyDirs = 0;
3473   while (path < end) {
3474     const char* tmp_end = strchr(path, separator);
3475     if (tmp_end == NULL) {
3476       if (has_jar_files(path)) {
3477         nonEmptyDirs++;
3478         jio_fprintf(defaultStream::output_stream(),
3479           "Non-empty directory: %s\n", path);
3480       }
3481       path = end;
3482     } else {
3483       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3484       memcpy(dirpath, path, tmp_end - path);
3485       dirpath[tmp_end - path] = '\0';
3486       if (has_jar_files(dirpath)) {
3487         nonEmptyDirs++;
3488         jio_fprintf(defaultStream::output_stream(),
3489           "Non-empty directory: %s\n", dirpath);
3490       }
3491       FREE_C_HEAP_ARRAY(char, dirpath);
3492       path = tmp_end + 1;
3493     }
3494   }
3495   return nonEmptyDirs;
3496 }
3497 
3498 jint Arguments::finalize_vm_init_args() {
3499   // check if the default lib/endorsed directory exists; if so, error
3500   char path[JVM_MAXPATHLEN];
3501   const char* fileSep = os::file_separator();
3502   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3503 
3504   if (CheckEndorsedAndExtDirs) {
3505     int nonEmptyDirs = 0;
3506     // check endorsed directory
3507     nonEmptyDirs += check_non_empty_dirs(path);
3508     // check the extension directories
3509     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3510     if (nonEmptyDirs > 0) {
3511       return JNI_ERR;
3512     }
3513   }
3514 
3515   DIR* dir = os::opendir(path);
3516   if (dir != NULL) {
3517     jio_fprintf(defaultStream::output_stream(),
3518       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3519       "in modular form will be supported via the concept of upgradeable modules.\n");
3520     os::closedir(dir);
3521     return JNI_ERR;
3522   }
3523 
3524   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3525   dir = os::opendir(path);
3526   if (dir != NULL) {
3527     jio_fprintf(defaultStream::output_stream(),
3528       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3529       "Use -classpath instead.\n.");
3530     os::closedir(dir);
3531     return JNI_ERR;
3532   }
3533 
3534   // This must be done after all arguments have been processed.
3535   // java_compiler() true means set to "NONE" or empty.
3536   if (java_compiler() && !xdebug_mode()) {
3537     // For backwards compatibility, we switch to interpreted mode if
3538     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3539     // not specified.
3540     set_mode_flags(_int);
3541   }
3542 
3543   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3544   // but like -Xint, leave compilation thresholds unaffected.
3545   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3546   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3547     set_mode_flags(_int);
3548   }
3549 
3550   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3551   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3552     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3553   }
3554 
3555 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3556   // Don't degrade server performance for footprint
3557   if (FLAG_IS_DEFAULT(UseLargePages) &&
3558       MaxHeapSize < LargePageHeapSizeThreshold) {
3559     // No need for large granularity pages w/small heaps.
3560     // Note that large pages are enabled/disabled for both the
3561     // Java heap and the code cache.
3562     FLAG_SET_DEFAULT(UseLargePages, false);
3563   }
3564 
3565 #elif defined(COMPILER2)
3566   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3567     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3568   }
3569 #endif
3570 
3571 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3572   UNSUPPORTED_OPTION(ProfileInterpreter);
3573   NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3574 #endif
3575 
3576 #ifndef TIERED
3577   // Tiered compilation is undefined.
3578   UNSUPPORTED_OPTION(TieredCompilation);
3579 #endif
3580 
3581 #if INCLUDE_JVMCI
3582   if (EnableJVMCI &&
3583       !create_numbered_property("jdk.module.addmods", "jdk.vm.ci", addmods_count++)) {
3584     return JNI_ENOMEM;
3585   }
3586 #endif
3587 
3588   // If we are running in a headless jre, force java.awt.headless property
3589   // to be true unless the property has already been set.
3590   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3591   if (os::is_headless_jre()) {
3592     const char* headless = Arguments::get_property("java.awt.headless");
3593     if (headless == NULL) {
3594       const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3595       if (headless_env == NULL) {
3596         if (!add_property("java.awt.headless=true")) {
3597           return JNI_ENOMEM;
3598         }
3599       } else {
3600         char buffer[256];
3601         jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3602         if (!add_property(buffer)) {
3603           return JNI_ENOMEM;
3604         }
3605       }
3606     }
3607   }
3608 
3609   if (!check_vm_args_consistency()) {
3610     return JNI_ERR;
3611   }
3612 
3613   return JNI_OK;
3614 }
3615 
3616 // Helper class for controlling the lifetime of JavaVMInitArgs
3617 // objects.  The contents of the JavaVMInitArgs are guaranteed to be
3618 // deleted on the destruction of the ScopedVMInitArgs object.
3619 class ScopedVMInitArgs : public StackObj {
3620  private:
3621   JavaVMInitArgs _args;
3622   char*          _container_name;
3623   bool           _is_set;
3624   char*          _vm_options_file_arg;
3625 
3626  public:
3627   ScopedVMInitArgs(const char *container_name) {
3628     _args.version = JNI_VERSION_1_2;
3629     _args.nOptions = 0;
3630     _args.options = NULL;
3631     _args.ignoreUnrecognized = false;
3632     _container_name = (char *)container_name;
3633     _is_set = false;
3634     _vm_options_file_arg = NULL;
3635   }
3636 
3637   // Populates the JavaVMInitArgs object represented by this
3638   // ScopedVMInitArgs object with the arguments in options.  The
3639   // allocated memory is deleted by the destructor.  If this method
3640   // returns anything other than JNI_OK, then this object is in a
3641   // partially constructed state, and should be abandoned.
3642   jint set_args(GrowableArray<JavaVMOption>* options) {
3643     _is_set = true;
3644     JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3645         JavaVMOption, options->length(), mtArguments);
3646     if (options_arr == NULL) {
3647       return JNI_ENOMEM;
3648     }
3649     _args.options = options_arr;
3650 
3651     for (int i = 0; i < options->length(); i++) {
3652       options_arr[i] = options->at(i);
3653       options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3654       if (options_arr[i].optionString == NULL) {
3655         // Rely on the destructor to do cleanup.
3656         _args.nOptions = i;
3657         return JNI_ENOMEM;
3658       }
3659     }
3660 
3661     _args.nOptions = options->length();
3662     _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3663     return JNI_OK;
3664   }
3665 
3666   JavaVMInitArgs* get()             { return &_args; }
3667   char* container_name()            { return _container_name; }
3668   bool  is_set()                    { return _is_set; }
3669   bool  found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3670   char* vm_options_file_arg()       { return _vm_options_file_arg; }
3671 
3672   void set_vm_options_file_arg(const char *vm_options_file_arg) {
3673     if (_vm_options_file_arg != NULL) {
3674       os::free(_vm_options_file_arg);
3675     }
3676     _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3677   }
3678 
3679   ~ScopedVMInitArgs() {
3680     if (_vm_options_file_arg != NULL) {
3681       os::free(_vm_options_file_arg);
3682     }
3683     if (_args.options == NULL) return;
3684     for (int i = 0; i < _args.nOptions; i++) {
3685       os::free(_args.options[i].optionString);
3686     }
3687     FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3688   }
3689 
3690   // Insert options into this option list, to replace option at
3691   // vm_options_file_pos (-XX:VMOptionsFile)
3692   jint insert(const JavaVMInitArgs* args,
3693               const JavaVMInitArgs* args_to_insert,
3694               const int vm_options_file_pos) {
3695     assert(_args.options == NULL, "shouldn't be set yet");
3696     assert(args_to_insert->nOptions != 0, "there should be args to insert");
3697     assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3698 
3699     int length = args->nOptions + args_to_insert->nOptions - 1;
3700     GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3701               GrowableArray<JavaVMOption>(length, true);    // Construct new option array
3702     for (int i = 0; i < args->nOptions; i++) {
3703       if (i == vm_options_file_pos) {
3704         // insert the new options starting at the same place as the
3705         // -XX:VMOptionsFile option
3706         for (int j = 0; j < args_to_insert->nOptions; j++) {
3707           options->push(args_to_insert->options[j]);
3708         }
3709       } else {
3710         options->push(args->options[i]);
3711       }
3712     }
3713     // make into options array
3714     jint result = set_args(options);
3715     delete options;
3716     return result;
3717   }
3718 };
3719 
3720 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3721   return parse_options_environment_variable("_JAVA_OPTIONS", args);
3722 }
3723 
3724 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3725   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3726 }
3727 
3728 jint Arguments::parse_options_environment_variable(const char* name,
3729                                                    ScopedVMInitArgs* vm_args) {
3730   char *buffer = ::getenv(name);
3731 
3732   // Don't check this environment variable if user has special privileges
3733   // (e.g. unix su command).
3734   if (buffer == NULL || os::have_special_privileges()) {
3735     return JNI_OK;
3736   }
3737 
3738   if ((buffer = os::strdup(buffer)) == NULL) {
3739     return JNI_ENOMEM;
3740   }
3741 
3742   int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3743 
3744   os::free(buffer);
3745   return retcode;
3746 }
3747 
3748 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3749   // read file into buffer
3750   int fd = ::open(file_name, O_RDONLY);
3751   if (fd < 0) {
3752     jio_fprintf(defaultStream::error_stream(),
3753                 "Could not open options file '%s'\n",
3754                 file_name);
3755     return JNI_ERR;
3756   }
3757 
3758   struct stat stbuf;
3759   int retcode = os::stat(file_name, &stbuf);
3760   if (retcode != 0) {
3761     jio_fprintf(defaultStream::error_stream(),
3762                 "Could not stat options file '%s'\n",
3763                 file_name);
3764     os::close(fd);
3765     return JNI_ERR;
3766   }
3767 
3768   if (stbuf.st_size == 0) {
3769     // tell caller there is no option data and that is ok
3770     os::close(fd);
3771     return JNI_OK;
3772   }
3773 
3774   // '+ 1' for NULL termination even with max bytes
3775   size_t bytes_alloc = stbuf.st_size + 1;
3776 
3777   char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3778   if (NULL == buf) {
3779     jio_fprintf(defaultStream::error_stream(),
3780                 "Could not allocate read buffer for options file parse\n");
3781     os::close(fd);
3782     return JNI_ENOMEM;
3783   }
3784 
3785   memset(buf, 0, bytes_alloc);
3786 
3787   // Fill buffer
3788   // Use ::read() instead of os::read because os::read()
3789   // might do a thread state transition
3790   // and it is too early for that here
3791 
3792   ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3793   os::close(fd);
3794   if (bytes_read < 0) {
3795     FREE_C_HEAP_ARRAY(char, buf);
3796     jio_fprintf(defaultStream::error_stream(),
3797                 "Could not read options file '%s'\n", file_name);
3798     return JNI_ERR;
3799   }
3800 
3801   if (bytes_read == 0) {
3802     // tell caller there is no option data and that is ok
3803     FREE_C_HEAP_ARRAY(char, buf);
3804     return JNI_OK;
3805   }
3806 
3807   retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3808 
3809   FREE_C_HEAP_ARRAY(char, buf);
3810   return retcode;
3811 }
3812 
3813 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3814   GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true);    // Construct option array
3815 
3816   // some pointers to help with parsing
3817   char *buffer_end = buffer + buf_len;
3818   char *opt_hd = buffer;
3819   char *wrt = buffer;
3820   char *rd = buffer;
3821 
3822   // parse all options
3823   while (rd < buffer_end) {
3824     // skip leading white space from the input string
3825     while (rd < buffer_end && isspace(*rd)) {
3826       rd++;
3827     }
3828 
3829     if (rd >= buffer_end) {
3830       break;
3831     }
3832 
3833     // Remember this is where we found the head of the token.
3834     opt_hd = wrt;
3835 
3836     // Tokens are strings of non white space characters separated
3837     // by one or more white spaces.
3838     while (rd < buffer_end && !isspace(*rd)) {
3839       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3840         int quote = *rd;                    // matching quote to look for
3841         rd++;                               // don't copy open quote
3842         while (rd < buffer_end && *rd != quote) {
3843                                             // include everything (even spaces)
3844                                             // up until the close quote
3845           *wrt++ = *rd++;                   // copy to option string
3846         }
3847 
3848         if (rd < buffer_end) {
3849           rd++;                             // don't copy close quote
3850         } else {
3851                                             // did not see closing quote
3852           jio_fprintf(defaultStream::error_stream(),
3853                       "Unmatched quote in %s\n", name);
3854           delete options;
3855           return JNI_ERR;
3856         }
3857       } else {
3858         *wrt++ = *rd++;                     // copy to option string
3859       }
3860     }
3861 
3862     // steal a white space character and set it to NULL
3863     *wrt++ = '\0';
3864     // We now have a complete token
3865 
3866     JavaVMOption option;
3867     option.optionString = opt_hd;
3868     option.extraInfo = NULL;
3869 
3870     options->append(option);                // Fill in option
3871 
3872     rd++;  // Advance to next character
3873   }
3874 
3875   // Fill out JavaVMInitArgs structure.
3876   jint status = vm_args->set_args(options);
3877 
3878   delete options;
3879   return status;
3880 }
3881 
3882 void Arguments::set_shared_spaces_flags() {
3883   if (DumpSharedSpaces) {
3884     if (FailOverToOldVerifier) {
3885       // Don't fall back to the old verifier on verification failure. If a
3886       // class fails verification with the split verifier, it might fail the
3887       // CDS runtime verifier constraint check. In that case, we don't want
3888       // to share the class. We only archive classes that pass the split verifier.
3889       FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3890     }
3891 
3892     if (RequireSharedSpaces) {
3893       warning("Cannot dump shared archive while using shared archive");
3894     }
3895     UseSharedSpaces = false;
3896 #ifdef _LP64
3897     if (!UseCompressedOops || !UseCompressedClassPointers) {
3898       vm_exit_during_initialization(
3899         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3900     }
3901   } else {
3902     if (!UseCompressedOops || !UseCompressedClassPointers) {
3903       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3904     }
3905 #endif
3906   }
3907 }
3908 
3909 // Sharing support
3910 // Construct the path to the archive
3911 static char* get_shared_archive_path() {
3912   char *shared_archive_path;
3913   if (SharedArchiveFile == NULL) {
3914     char jvm_path[JVM_MAXPATHLEN];
3915     os::jvm_path(jvm_path, sizeof(jvm_path));
3916     char *end = strrchr(jvm_path, *os::file_separator());
3917     if (end != NULL) *end = '\0';
3918     size_t jvm_path_len = strlen(jvm_path);
3919     size_t file_sep_len = strlen(os::file_separator());
3920     const size_t len = jvm_path_len + file_sep_len + 20;
3921     shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3922     if (shared_archive_path != NULL) {
3923       jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3924         jvm_path, os::file_separator());
3925     }
3926   } else {
3927     shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3928   }
3929   return shared_archive_path;
3930 }
3931 
3932 #ifndef PRODUCT
3933 // Determine whether LogVMOutput should be implicitly turned on.
3934 static bool use_vm_log() {
3935   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3936       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3937       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3938       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3939       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3940     return true;
3941   }
3942 
3943 #ifdef COMPILER1
3944   if (PrintC1Statistics) {
3945     return true;
3946   }
3947 #endif // COMPILER1
3948 
3949 #ifdef COMPILER2
3950   if (PrintOptoAssembly || PrintOptoStatistics) {
3951     return true;
3952   }
3953 #endif // COMPILER2
3954 
3955   return false;
3956 }
3957 
3958 #endif // PRODUCT
3959 
3960 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3961   for (int index = 0; index < args->nOptions; index++) {
3962     const JavaVMOption* option = args->options + index;
3963     const char* tail;
3964     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3965       return true;
3966     }
3967   }
3968   return false;
3969 }
3970 
3971 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3972                                        const char* vm_options_file,
3973                                        const int vm_options_file_pos,
3974                                        ScopedVMInitArgs* vm_options_file_args,
3975                                        ScopedVMInitArgs* args_out) {
3976   jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3977   if (code != JNI_OK) {
3978     return code;
3979   }
3980 
3981   if (vm_options_file_args->get()->nOptions < 1) {
3982     return JNI_OK;
3983   }
3984 
3985   if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3986     jio_fprintf(defaultStream::error_stream(),
3987                 "A VM options file may not refer to a VM options file. "
3988                 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3989                 "options file '%s' in options container '%s' is an error.\n",
3990                 vm_options_file_args->vm_options_file_arg(),
3991                 vm_options_file_args->container_name());
3992     return JNI_EINVAL;
3993   }
3994 
3995   return args_out->insert(args, vm_options_file_args->get(),
3996                           vm_options_file_pos);
3997 }
3998 
3999 // Expand -XX:VMOptionsFile found in args_in as needed.
4000 // mod_args and args_out parameters may return values as needed.
4001 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4002                                             ScopedVMInitArgs* mod_args,
4003                                             JavaVMInitArgs** args_out) {
4004   jint code = match_special_option_and_act(args_in, mod_args);
4005   if (code != JNI_OK) {
4006     return code;
4007   }
4008 
4009   if (mod_args->is_set()) {
4010     // args_in contains -XX:VMOptionsFile and mod_args contains the
4011     // original options from args_in along with the options expanded
4012     // from the VMOptionsFile. Return a short-hand to the caller.
4013     *args_out = mod_args->get();
4014   } else {
4015     *args_out = (JavaVMInitArgs *)args_in;  // no changes so use args_in
4016   }
4017   return JNI_OK;
4018 }
4019 
4020 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4021                                              ScopedVMInitArgs* args_out) {
4022   // Remaining part of option string
4023   const char* tail;
4024   ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4025 
4026   for (int index = 0; index < args->nOptions; index++) {
4027     const JavaVMOption* option = args->options + index;
4028     if (ArgumentsExt::process_options(option)) {
4029       continue;
4030     }
4031     if (match_option(option, "-XX:Flags=", &tail)) {
4032       Arguments::set_jvm_flags_file(tail);
4033       continue;
4034     }
4035     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4036       if (vm_options_file_args.found_vm_options_file_arg()) {
4037         jio_fprintf(defaultStream::error_stream(),
4038                     "The option '%s' is already specified in the options "
4039                     "container '%s' so the specification of '%s' in the "
4040                     "same options container is an error.\n",
4041                     vm_options_file_args.vm_options_file_arg(),
4042                     vm_options_file_args.container_name(),
4043                     option->optionString);
4044         return JNI_EINVAL;
4045       }
4046       vm_options_file_args.set_vm_options_file_arg(option->optionString);
4047       // If there's a VMOptionsFile, parse that
4048       jint code = insert_vm_options_file(args, tail, index,
4049                                          &vm_options_file_args, args_out);
4050       if (code != JNI_OK) {
4051         return code;
4052       }
4053       args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4054       if (args_out->is_set()) {
4055         // The VMOptions file inserted some options so switch 'args'
4056         // to the new set of options, and continue processing which
4057         // preserves "last option wins" semantics.
4058         args = args_out->get();
4059         // The first option from the VMOptionsFile replaces the
4060         // current option.  So we back track to process the
4061         // replacement option.
4062         index--;
4063       }
4064       continue;
4065     }
4066     if (match_option(option, "-XX:+PrintVMOptions")) {
4067       PrintVMOptions = true;
4068       continue;
4069     }
4070     if (match_option(option, "-XX:-PrintVMOptions")) {
4071       PrintVMOptions = false;
4072       continue;
4073     }
4074     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4075       IgnoreUnrecognizedVMOptions = true;
4076       continue;
4077     }
4078     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4079       IgnoreUnrecognizedVMOptions = false;
4080       continue;
4081     }
4082     if (match_option(option, "-XX:+PrintFlagsInitial")) {
4083       CommandLineFlags::printFlags(tty, false);
4084       vm_exit(0);
4085     }
4086     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4087 #if INCLUDE_NMT
4088       // The launcher did not setup nmt environment variable properly.
4089       if (!MemTracker::check_launcher_nmt_support(tail)) {
4090         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4091       }
4092 
4093       // Verify if nmt option is valid.
4094       if (MemTracker::verify_nmt_option()) {
4095         // Late initialization, still in single-threaded mode.
4096         if (MemTracker::tracking_level() >= NMT_summary) {
4097           MemTracker::init();
4098         }
4099       } else {
4100         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4101       }
4102       continue;
4103 #else
4104       jio_fprintf(defaultStream::error_stream(),
4105         "Native Memory Tracking is not supported in this VM\n");
4106       return JNI_ERR;
4107 #endif
4108     }
4109 
4110 #ifndef PRODUCT
4111     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4112       CommandLineFlags::printFlags(tty, true);
4113       vm_exit(0);
4114     }
4115 #endif
4116   }
4117   return JNI_OK;
4118 }
4119 
4120 static void print_options(const JavaVMInitArgs *args) {
4121   const char* tail;
4122   for (int index = 0; index < args->nOptions; index++) {
4123     const JavaVMOption *option = args->options + index;
4124     if (match_option(option, "-XX:", &tail)) {
4125       logOption(tail);
4126     }
4127   }
4128 }
4129 
4130 bool Arguments::handle_deprecated_print_gc_flags() {
4131   if (PrintGC) {
4132     log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4133   }
4134   if (PrintGCDetails) {
4135     log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4136   }
4137 
4138   if (_gc_log_filename != NULL) {
4139     // -Xloggc was used to specify a filename
4140     const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4141 
4142     LogTarget(Error, logging) target;
4143     LogStreamCHeap errstream(target);
4144     return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4145   } else if (PrintGC || PrintGCDetails) {
4146     LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4147   }
4148   return true;
4149 }
4150 
4151 void Arguments::handle_extra_cms_flags(const char* msg) {
4152   SpecialFlag flag;
4153   const char *flag_name = "UseConcMarkSweepGC";
4154   if (lookup_special_flag(flag_name, flag)) {
4155     handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4156     warning("%s", msg);
4157   }
4158 }
4159 
4160 // Parse entry point called from JNI_CreateJavaVM
4161 
4162 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4163   assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4164 
4165   // Initialize ranges, constraints and writeables
4166   CommandLineFlagRangeList::init();
4167   CommandLineFlagConstraintList::init();
4168   CommandLineFlagWriteableList::init();
4169 
4170   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4171   const char* hotspotrc = ".hotspotrc";
4172   bool settings_file_specified = false;
4173   bool needs_hotspotrc_warning = false;
4174   ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4175   ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4176 
4177   // Pointers to current working set of containers
4178   JavaVMInitArgs* cur_cmd_args;
4179   JavaVMInitArgs* cur_java_options_args;
4180   JavaVMInitArgs* cur_java_tool_options_args;
4181 
4182   // Containers for modified/expanded options
4183   ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4184   ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4185   ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4186 
4187 
4188   jint code =
4189       parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4190   if (code != JNI_OK) {
4191     return code;
4192   }
4193 
4194   code = parse_java_options_environment_variable(&initial_java_options_args);
4195   if (code != JNI_OK) {
4196     return code;
4197   }
4198 
4199   code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4200                                      &mod_java_tool_options_args,
4201                                      &cur_java_tool_options_args);
4202   if (code != JNI_OK) {
4203     return code;
4204   }
4205 
4206   code = expand_vm_options_as_needed(initial_cmd_args,
4207                                      &mod_cmd_args,
4208                                      &cur_cmd_args);
4209   if (code != JNI_OK) {
4210     return code;
4211   }
4212 
4213   code = expand_vm_options_as_needed(initial_java_options_args.get(),
4214                                      &mod_java_options_args,
4215                                      &cur_java_options_args);
4216   if (code != JNI_OK) {
4217     return code;
4218   }
4219 
4220   const char* flags_file = Arguments::get_jvm_flags_file();
4221   settings_file_specified = (flags_file != NULL);
4222 
4223   if (IgnoreUnrecognizedVMOptions) {
4224     cur_cmd_args->ignoreUnrecognized = true;
4225     cur_java_tool_options_args->ignoreUnrecognized = true;
4226     cur_java_options_args->ignoreUnrecognized = true;
4227   }
4228 
4229   // Parse specified settings file
4230   if (settings_file_specified) {
4231     if (!process_settings_file(flags_file, true,
4232                                cur_cmd_args->ignoreUnrecognized)) {
4233       return JNI_EINVAL;
4234     }
4235   } else {
4236 #ifdef ASSERT
4237     // Parse default .hotspotrc settings file
4238     if (!process_settings_file(".hotspotrc", false,
4239                                cur_cmd_args->ignoreUnrecognized)) {
4240       return JNI_EINVAL;
4241     }
4242 #else
4243     struct stat buf;
4244     if (os::stat(hotspotrc, &buf) == 0) {
4245       needs_hotspotrc_warning = true;
4246     }
4247 #endif
4248   }
4249 
4250   if (PrintVMOptions) {
4251     print_options(cur_java_tool_options_args);
4252     print_options(cur_cmd_args);
4253     print_options(cur_java_options_args);
4254   }
4255 
4256   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4257   jint result = parse_vm_init_args(cur_java_tool_options_args,
4258                                    cur_java_options_args,
4259                                    cur_cmd_args);
4260 
4261   if (result != JNI_OK) {
4262     return result;
4263   }
4264 
4265   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4266   SharedArchivePath = get_shared_archive_path();
4267   if (SharedArchivePath == NULL) {
4268     return JNI_ENOMEM;
4269   }
4270 
4271   // Set up VerifySharedSpaces
4272   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4273     VerifySharedSpaces = true;
4274   }
4275 
4276   // Delay warning until here so that we've had a chance to process
4277   // the -XX:-PrintWarnings flag
4278   if (needs_hotspotrc_warning) {
4279     warning("%s file is present but has been ignored.  "
4280             "Run with -XX:Flags=%s to load the file.",
4281             hotspotrc, hotspotrc);
4282   }
4283 
4284   if (needs_module_property_warning) {
4285     warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4286             " names that are reserved for internal use.");
4287   }
4288 
4289 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
4290   UNSUPPORTED_OPTION(UseLargePages);
4291 #endif
4292 
4293   ArgumentsExt::report_unsupported_options();
4294 
4295 #ifndef PRODUCT
4296   if (TraceBytecodesAt != 0) {
4297     TraceBytecodes = true;
4298   }
4299   if (CountCompiledCalls) {
4300     if (UseCounterDecay) {
4301       warning("UseCounterDecay disabled because CountCalls is set");
4302       UseCounterDecay = false;
4303     }
4304   }
4305 #endif // PRODUCT
4306 
4307   if (ScavengeRootsInCode == 0) {
4308     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4309       warning("Forcing ScavengeRootsInCode non-zero");
4310     }
4311     ScavengeRootsInCode = 1;
4312   }
4313 
4314   if (!handle_deprecated_print_gc_flags()) {
4315     return JNI_EINVAL;
4316   }
4317 
4318   // Set object alignment values.
4319   set_object_alignment();
4320 
4321 #if !INCLUDE_CDS
4322   if (DumpSharedSpaces || RequireSharedSpaces) {
4323     jio_fprintf(defaultStream::error_stream(),
4324       "Shared spaces are not supported in this VM\n");
4325     return JNI_ERR;
4326   }
4327   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4328     warning("Shared spaces are not supported in this VM");
4329     FLAG_SET_DEFAULT(UseSharedSpaces, false);
4330     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4331   }
4332   no_shared_spaces("CDS Disabled");
4333 #endif // INCLUDE_CDS
4334 
4335   return JNI_OK;
4336 }
4337 
4338 jint Arguments::apply_ergo() {
4339   // Set flags based on ergonomics.
4340   set_ergonomics_flags();
4341 
4342   set_shared_spaces_flags();
4343 
4344   // Check the GC selections again.
4345   if (!check_gc_consistency()) {
4346     return JNI_EINVAL;
4347   }
4348 
4349   if (TieredCompilation) {
4350     set_tiered_flags();
4351   } else {
4352     int max_compilation_policy_choice = 1;
4353 #ifdef COMPILER2
4354     max_compilation_policy_choice = 2;
4355 #endif
4356     // Check if the policy is valid.
4357     if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4358       vm_exit_during_initialization(
4359         "Incompatible compilation policy selected", NULL);
4360     }
4361     // Scale CompileThreshold
4362     // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4363     if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4364       FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4365     }
4366   }
4367 
4368 #ifdef COMPILER2
4369 #ifndef PRODUCT
4370   if (PrintIdealGraphLevel > 0) {
4371     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4372   }
4373 #endif
4374 #endif
4375 
4376   // Set heap size based on available physical memory
4377   set_heap_size();
4378 
4379   ArgumentsExt::set_gc_specific_flags();
4380 
4381   // Initialize Metaspace flags and alignments
4382   Metaspace::ergo_initialize();
4383 
4384   // Set bytecode rewriting flags
4385   set_bytecode_flags();
4386 
4387   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4388   jint code = set_aggressive_opts_flags();
4389   if (code != JNI_OK) {
4390     return code;
4391   }
4392 
4393   // Turn off biased locking for locking debug mode flags,
4394   // which are subtly different from each other but neither works with
4395   // biased locking
4396   if (UseHeavyMonitors
4397 #ifdef COMPILER1
4398       || !UseFastLocking
4399 #endif // COMPILER1
4400 #if INCLUDE_JVMCI
4401       || !JVMCIUseFastLocking
4402 #endif
4403     ) {
4404     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4405       // flag set to true on command line; warn the user that they
4406       // can't enable biased locking here
4407       warning("Biased Locking is not supported with locking debug flags"
4408               "; ignoring UseBiasedLocking flag." );
4409     }
4410     UseBiasedLocking = false;
4411   }
4412 
4413 #ifdef CC_INTERP
4414   // Clear flags not supported on zero.
4415   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4416   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4417   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4418   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4419 #endif // CC_INTERP
4420 
4421 #ifdef COMPILER2
4422   if (!EliminateLocks) {
4423     EliminateNestedLocks = false;
4424   }
4425   if (!Inline) {
4426     IncrementalInline = false;
4427   }
4428 #ifndef PRODUCT
4429   if (!IncrementalInline) {
4430     AlwaysIncrementalInline = false;
4431   }
4432 #endif
4433   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4434     // nothing to use the profiling, turn if off
4435     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4436   }
4437 #endif
4438 
4439   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4440     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4441     DebugNonSafepoints = true;
4442   }
4443 
4444   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4445     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4446   }
4447 
4448   if (UseOnStackReplacement && !UseLoopCounter) {
4449     warning("On-stack-replacement requires loop counters; enabling loop counters");
4450     FLAG_SET_DEFAULT(UseLoopCounter, true);
4451   }
4452 
4453 #ifndef PRODUCT
4454   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4455     if (use_vm_log()) {
4456       LogVMOutput = true;
4457     }
4458   }
4459 #endif // PRODUCT
4460 
4461   if (PrintCommandLineFlags) {
4462     CommandLineFlags::printSetFlags(tty);
4463   }
4464 
4465   // Apply CPU specific policy for the BiasedLocking
4466   if (UseBiasedLocking) {
4467     if (!VM_Version::use_biased_locking() &&
4468         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4469       UseBiasedLocking = false;
4470     }
4471   }
4472 #ifdef COMPILER2
4473   if (!UseBiasedLocking || EmitSync != 0) {
4474     UseOptoBiasInlining = false;
4475   }
4476 #endif
4477 
4478   return JNI_OK;
4479 }
4480 
4481 jint Arguments::adjust_after_os() {
4482   if (UseNUMA) {
4483     if (UseParallelGC || UseParallelOldGC) {
4484       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4485          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4486       }
4487     }
4488     // UseNUMAInterleaving is set to ON for all collectors and
4489     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4490     // such as the parallel collector for Linux and Solaris will
4491     // interleave old gen and survivor spaces on top of NUMA
4492     // allocation policy for the eden space.
4493     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4494     // all platforms and ParallelGC on Windows will interleave all
4495     // of the heap spaces across NUMA nodes.
4496     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4497       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4498     }
4499   }
4500   return JNI_OK;
4501 }
4502 
4503 int Arguments::PropertyList_count(SystemProperty* pl) {
4504   int count = 0;
4505   while(pl != NULL) {
4506     count++;
4507     pl = pl->next();
4508   }
4509   return count;
4510 }
4511 
4512 // Return the number of readable properties.
4513 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4514   int count = 0;
4515   while(pl != NULL) {
4516     if (pl->is_readable()) {
4517       count++;
4518     }
4519     pl = pl->next();
4520   }
4521   return count;
4522 }
4523 
4524 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4525   assert(key != NULL, "just checking");
4526   SystemProperty* prop;
4527   for (prop = pl; prop != NULL; prop = prop->next()) {
4528     if (strcmp(key, prop->key()) == 0) return prop->value();
4529   }
4530   return NULL;
4531 }
4532 
4533 // Return the value of the requested property provided that it is a readable property.
4534 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4535   assert(key != NULL, "just checking");
4536   SystemProperty* prop;
4537   // Return the property value if the keys match and the property is not internal or
4538   // it's the special internal property "jdk.boot.class.path.append".
4539   for (prop = pl; prop != NULL; prop = prop->next()) {
4540     if (strcmp(key, prop->key()) == 0) {
4541       if (!prop->internal()) {
4542         return prop->value();
4543       } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4544         return prop->value();
4545       } else {
4546         // Property is internal and not jdk.boot.class.path.append so return NULL.
4547         return NULL;
4548       }
4549     }
4550   }
4551   return NULL;
4552 }
4553 
4554 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4555   int count = 0;
4556   const char* ret_val = NULL;
4557 
4558   while(pl != NULL) {
4559     if(count >= index) {
4560       ret_val = pl->key();
4561       break;
4562     }
4563     count++;
4564     pl = pl->next();
4565   }
4566 
4567   return ret_val;
4568 }
4569 
4570 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4571   int count = 0;
4572   char* ret_val = NULL;
4573 
4574   while(pl != NULL) {
4575     if(count >= index) {
4576       ret_val = pl->value();
4577       break;
4578     }
4579     count++;
4580     pl = pl->next();
4581   }
4582 
4583   return ret_val;
4584 }
4585 
4586 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4587   SystemProperty* p = *plist;
4588   if (p == NULL) {
4589     *plist = new_p;
4590   } else {
4591     while (p->next() != NULL) {
4592       p = p->next();
4593     }
4594     p->set_next(new_p);
4595   }
4596 }
4597 
4598 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4599                                  bool writeable, bool internal) {
4600   if (plist == NULL)
4601     return;
4602 
4603   SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4604   PropertyList_add(plist, new_p);
4605 }
4606 
4607 void Arguments::PropertyList_add(SystemProperty *element) {
4608   PropertyList_add(&_system_properties, element);
4609 }
4610 
4611 // This add maintains unique property key in the list.
4612 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4613                                         PropertyAppendable append, PropertyWriteable writeable,
4614                                         PropertyInternal internal) {
4615   if (plist == NULL)
4616     return;
4617 
4618   // If property key exist then update with new value.
4619   SystemProperty* prop;
4620   for (prop = *plist; prop != NULL; prop = prop->next()) {
4621     if (strcmp(k, prop->key()) == 0) {
4622       if (append == AppendProperty) {
4623         prop->append_value(v);
4624       } else {
4625         prop->set_value(v);
4626       }
4627       return;
4628     }
4629   }
4630 
4631   PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4632 }
4633 
4634 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4635 // Returns true if all of the source pointed by src has been copied over to
4636 // the destination buffer pointed by buf. Otherwise, returns false.
4637 // Notes:
4638 // 1. If the length (buflen) of the destination buffer excluding the
4639 // NULL terminator character is not long enough for holding the expanded
4640 // pid characters, it also returns false instead of returning the partially
4641 // expanded one.
4642 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4643 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4644                                 char* buf, size_t buflen) {
4645   const char* p = src;
4646   char* b = buf;
4647   const char* src_end = &src[srclen];
4648   char* buf_end = &buf[buflen - 1];
4649 
4650   while (p < src_end && b < buf_end) {
4651     if (*p == '%') {
4652       switch (*(++p)) {
4653       case '%':         // "%%" ==> "%"
4654         *b++ = *p++;
4655         break;
4656       case 'p':  {       //  "%p" ==> current process id
4657         // buf_end points to the character before the last character so
4658         // that we could write '\0' to the end of the buffer.
4659         size_t buf_sz = buf_end - b + 1;
4660         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4661 
4662         // if jio_snprintf fails or the buffer is not long enough to hold
4663         // the expanded pid, returns false.
4664         if (ret < 0 || ret >= (int)buf_sz) {
4665           return false;
4666         } else {
4667           b += ret;
4668           assert(*b == '\0', "fail in copy_expand_pid");
4669           if (p == src_end && b == buf_end + 1) {
4670             // reach the end of the buffer.
4671             return true;
4672           }
4673         }
4674         p++;
4675         break;
4676       }
4677       default :
4678         *b++ = '%';
4679       }
4680     } else {
4681       *b++ = *p++;
4682     }
4683   }
4684   *b = '\0';
4685   return (p == src_end); // return false if not all of the source was copied
4686 }
--- EOF ---