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 if (result->is_double()) {
 738     double double_v = (double) v;
 739     return CommandLineFlags::doubleAtPut(result, &double_v, origin) == Flag::SUCCESS;
 740   } else {
 741     return false;
 742   }
 743 }
 744 
 745 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
 746   if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
 747   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 748   FREE_C_HEAP_ARRAY(char, value);
 749   return true;
 750 }
 751 
 752 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
 753   const char* old_value = "";
 754   if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
 755   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 756   size_t new_len = strlen(new_value);
 757   const char* value;
 758   char* free_this_too = NULL;
 759   if (old_len == 0) {
 760     value = new_value;
 761   } else if (new_len == 0) {
 762     value = old_value;
 763   } else {
 764      size_t length = old_len + 1 + new_len + 1;
 765      char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
 766     // each new setting adds another LINE to the switch:
 767     jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
 768     value = buf;
 769     free_this_too = buf;
 770   }
 771   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 772   // CommandLineFlags always returns a pointer that needs freeing.
 773   FREE_C_HEAP_ARRAY(char, value);
 774   if (free_this_too != NULL) {
 775     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 776     FREE_C_HEAP_ARRAY(char, free_this_too);
 777   }
 778   return true;
 779 }
 780 
 781 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
 782   const char* real_name = real_flag_name(arg);
 783   JDK_Version since = JDK_Version();
 784   switch (is_deprecated_flag(arg, &since)) {
 785     case -1:
 786       return NULL; // obsolete or expired, don't process normally
 787     case 0:
 788       return real_name;
 789     case 1: {
 790       if (warn) {
 791         char version[256];
 792         since.to_string(version, sizeof(version));
 793         if (real_name != arg) {
 794           warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
 795                   arg, version, real_name);
 796         } else {
 797           warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
 798                   arg, version);
 799         }
 800       }
 801       return real_name;
 802     }
 803   }
 804   ShouldNotReachHere();
 805   return NULL;
 806 }
 807 
 808 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
 809   LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
 810   // Set tagset string buffer at max size of 256, large enough for any alias tagset
 811   const int max_tagset_size = 256;
 812   int max_tagset_len = max_tagset_size - 1;
 813   char tagset_buffer[max_tagset_size];
 814   tagset_buffer[0] = '\0';
 815 
 816   // Write tag-set for aliased logging option, in string list form
 817   int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
 818   for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
 819     if (i > 0) {
 820       strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
 821     }
 822     strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
 823   }
 824   if (!alf.exactMatch) {
 825       strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
 826   }
 827   log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
 828                          (on) ? "+" : "-",
 829                          name,
 830                          tagset_buffer,
 831                          (on) ? LogLevel::name(alf.level) : "off");
 832 }
 833 
 834 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
 835   for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
 836     const AliasedLoggingFlag& alf = aliased_logging_flags[i];
 837     if (strcmp(alf.alias_name, name) == 0) {
 838       log_deprecated_flag(name, on, alf);
 839       return alf;
 840     }
 841   }
 842   AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
 843   return a;
 844 }
 845 
 846 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 847 
 848   // range of acceptable characters spelled out for portability reasons
 849 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 850 #define BUFLEN 255
 851   char name[BUFLEN+1];
 852   char dummy;
 853   const char* real_name;
 854   bool warn_if_deprecated = true;
 855 
 856   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 857     AliasedLoggingFlag alf = catch_logging_aliases(name, false);
 858     if (alf.alias_name != NULL){
 859       LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
 860       return true;
 861     }
 862     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 863     if (real_name == NULL) {
 864       return false;
 865     }
 866     return set_bool_flag(real_name, false, origin);
 867   }
 868   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 869     AliasedLoggingFlag alf = catch_logging_aliases(name, true);
 870     if (alf.alias_name != NULL){
 871       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
 872       return true;
 873     }
 874     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 875     if (real_name == NULL) {
 876       return false;
 877     }
 878     return set_bool_flag(real_name, true, origin);
 879   }
 880 
 881   char punct;
 882   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 883     const char* value = strchr(arg, '=') + 1;
 884     Flag* flag;
 885 
 886     // this scanf pattern matches both strings (handled here) and numbers (handled later))
 887     AliasedLoggingFlag alf = catch_logging_aliases(name, true);
 888     if (alf.alias_name != NULL) {
 889       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
 890       return true;
 891     }
 892     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 893     if (real_name == NULL) {
 894       return false;
 895     }
 896     flag = Flag::find_flag(real_name);
 897     if (flag != NULL && flag->is_ccstr()) {
 898       if (flag->ccstr_accumulates()) {
 899         return append_to_string_flag(real_name, value, origin);
 900       } else {
 901         if (value[0] == '\0') {
 902           value = NULL;
 903         }
 904         return set_string_flag(real_name, value, origin);
 905       }
 906     } else {
 907       warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
 908     }
 909   }
 910 
 911   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 912     const char* value = strchr(arg, '=') + 1;
 913     // -XX:Foo:=xxx will reset the string flag to the given value.
 914     if (value[0] == '\0') {
 915       value = NULL;
 916     }
 917     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 918     if (real_name == NULL) {
 919       return false;
 920     }
 921     return set_string_flag(real_name, value, origin);
 922   }
 923 
 924 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
 925 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 926 #define        NUMBER_RANGE    "[0123456789eE+-]"
 927   char value[BUFLEN + 1];
 928   char value2[BUFLEN + 1];
 929   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 930     // Looks like a floating-point number -- try again with more lenient format string
 931     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 932       real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 933       if (real_name == NULL) {
 934         return false;
 935       }
 936       return set_fp_numeric_flag(real_name, value, origin);
 937     }
 938   }
 939 
 940 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 941   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 942     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 943     if (real_name == NULL) {
 944       return false;
 945     }
 946     return set_numeric_flag(real_name, value, origin);
 947   }
 948 
 949   return false;
 950 }
 951 
 952 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 953   assert(bldarray != NULL, "illegal argument");
 954 
 955   if (arg == NULL) {
 956     return;
 957   }
 958 
 959   int new_count = *count + 1;
 960 
 961   // expand the array and add arg to the last element
 962   if (*bldarray == NULL) {
 963     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
 964   } else {
 965     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
 966   }
 967   (*bldarray)[*count] = os::strdup_check_oom(arg);
 968   *count = new_count;
 969 }
 970 
 971 void Arguments::build_jvm_args(const char* arg) {
 972   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 973 }
 974 
 975 void Arguments::build_jvm_flags(const char* arg) {
 976   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 977 }
 978 
 979 // utility function to return a string that concatenates all
 980 // strings in a given char** array
 981 const char* Arguments::build_resource_string(char** args, int count) {
 982   if (args == NULL || count == 0) {
 983     return NULL;
 984   }
 985   size_t length = 0;
 986   for (int i = 0; i < count; i++) {
 987     length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
 988   }
 989   char* s = NEW_RESOURCE_ARRAY(char, length);
 990   char* dst = s;
 991   for (int j = 0; j < count; j++) {
 992     size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
 993     jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
 994     dst += offset;
 995     length -= offset;
 996   }
 997   return (const char*) s;
 998 }
 999 
1000 void Arguments::print_on(outputStream* st) {
1001   st->print_cr("VM Arguments:");
1002   if (num_jvm_flags() > 0) {
1003     st->print("jvm_flags: "); print_jvm_flags_on(st);
1004     st->cr();
1005   }
1006   if (num_jvm_args() > 0) {
1007     st->print("jvm_args: "); print_jvm_args_on(st);
1008     st->cr();
1009   }
1010   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1011   if (_java_class_path != NULL) {
1012     char* path = _java_class_path->value();
1013     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1014   }
1015   st->print_cr("Launcher Type: %s", _sun_java_launcher);
1016 }
1017 
1018 void Arguments::print_summary_on(outputStream* st) {
1019   // Print the command line.  Environment variables that are helpful for
1020   // reproducing the problem are written later in the hs_err file.
1021   // flags are from setting file
1022   if (num_jvm_flags() > 0) {
1023     st->print_raw("Settings File: ");
1024     print_jvm_flags_on(st);
1025     st->cr();
1026   }
1027   // args are the command line and environment variable arguments.
1028   st->print_raw("Command Line: ");
1029   if (num_jvm_args() > 0) {
1030     print_jvm_args_on(st);
1031   }
1032   // this is the classfile and any arguments to the java program
1033   if (java_command() != NULL) {
1034     st->print("%s", java_command());
1035   }
1036   st->cr();
1037 }
1038 
1039 void Arguments::print_jvm_flags_on(outputStream* st) {
1040   if (_num_jvm_flags > 0) {
1041     for (int i=0; i < _num_jvm_flags; i++) {
1042       st->print("%s ", _jvm_flags_array[i]);
1043     }
1044   }
1045 }
1046 
1047 void Arguments::print_jvm_args_on(outputStream* st) {
1048   if (_num_jvm_args > 0) {
1049     for (int i=0; i < _num_jvm_args; i++) {
1050       st->print("%s ", _jvm_args_array[i]);
1051     }
1052   }
1053 }
1054 
1055 bool Arguments::process_argument(const char* arg,
1056                                  jboolean ignore_unrecognized,
1057                                  Flag::Flags origin) {
1058   JDK_Version since = JDK_Version();
1059 
1060   if (parse_argument(arg, origin)) {
1061     return true;
1062   }
1063 
1064   // Determine if the flag has '+', '-', or '=' characters.
1065   bool has_plus_minus = (*arg == '+' || *arg == '-');
1066   const char* const argname = has_plus_minus ? arg + 1 : arg;
1067 
1068   size_t arg_len;
1069   const char* equal_sign = strchr(argname, '=');
1070   if (equal_sign == NULL) {
1071     arg_len = strlen(argname);
1072   } else {
1073     arg_len = equal_sign - argname;
1074   }
1075 
1076   // Only make the obsolete check for valid arguments.
1077   if (arg_len <= BUFLEN) {
1078     // Construct a string which consists only of the argument name without '+', '-', or '='.
1079     char stripped_argname[BUFLEN+1]; // +1 for '\0'
1080     jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1081     if (is_obsolete_flag(stripped_argname, &since)) {
1082       char version[256];
1083       since.to_string(version, sizeof(version));
1084       warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1085       return true;
1086     }
1087 #ifndef PRODUCT
1088     else {
1089       const char* replacement;
1090       if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1091         log_warning(arguments)("%s has been removed. Please use %s instead.",
1092                                stripped_argname,
1093                                replacement);
1094         return false;
1095       }
1096     }
1097 #endif //PRODUCT
1098   }
1099 
1100   // For locked flags, report a custom error message if available.
1101   // Otherwise, report the standard unrecognized VM option.
1102   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1103   if (found_flag != NULL) {
1104     char locked_message_buf[BUFLEN];
1105     Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1106     if (strlen(locked_message_buf) == 0) {
1107       if (found_flag->is_bool() && !has_plus_minus) {
1108         jio_fprintf(defaultStream::error_stream(),
1109           "Missing +/- setting for VM option '%s'\n", argname);
1110       } else if (!found_flag->is_bool() && has_plus_minus) {
1111         jio_fprintf(defaultStream::error_stream(),
1112           "Unexpected +/- setting in VM option '%s'\n", argname);
1113       } else {
1114         jio_fprintf(defaultStream::error_stream(),
1115           "Improperly specified VM option '%s'\n", argname);
1116       }
1117     } else {
1118 #ifdef PRODUCT
1119       bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1120                          (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1121       if (ignore_unrecognized && mismatched) {
1122         return true;
1123       }
1124 #endif
1125       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1126     }
1127   } else {
1128     if (ignore_unrecognized) {
1129       return true;
1130     }
1131     jio_fprintf(defaultStream::error_stream(),
1132                 "Unrecognized VM option '%s'\n", argname);
1133     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1134     if (fuzzy_matched != NULL) {
1135       jio_fprintf(defaultStream::error_stream(),
1136                   "Did you mean '%s%s%s'? ",
1137                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1138                   fuzzy_matched->_name,
1139                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
1140     }
1141   }
1142 
1143   // allow for commandline "commenting out" options like -XX:#+Verbose
1144   return arg[0] == '#';
1145 }
1146 
1147 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1148   FILE* stream = fopen(file_name, "rb");
1149   if (stream == NULL) {
1150     if (should_exist) {
1151       jio_fprintf(defaultStream::error_stream(),
1152                   "Could not open settings file %s\n", file_name);
1153       return false;
1154     } else {
1155       return true;
1156     }
1157   }
1158 
1159   char token[1024];
1160   int  pos = 0;
1161 
1162   bool in_white_space = true;
1163   bool in_comment     = false;
1164   bool in_quote       = false;
1165   char quote_c        = 0;
1166   bool result         = true;
1167 
1168   int c = getc(stream);
1169   while(c != EOF && pos < (int)(sizeof(token)-1)) {
1170     if (in_white_space) {
1171       if (in_comment) {
1172         if (c == '\n') in_comment = false;
1173       } else {
1174         if (c == '#') in_comment = true;
1175         else if (!isspace(c)) {
1176           in_white_space = false;
1177           token[pos++] = c;
1178         }
1179       }
1180     } else {
1181       if (c == '\n' || (!in_quote && isspace(c))) {
1182         // token ends at newline, or at unquoted whitespace
1183         // this allows a way to include spaces in string-valued options
1184         token[pos] = '\0';
1185         logOption(token);
1186         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1187         build_jvm_flags(token);
1188         pos = 0;
1189         in_white_space = true;
1190         in_quote = false;
1191       } else if (!in_quote && (c == '\'' || c == '"')) {
1192         in_quote = true;
1193         quote_c = c;
1194       } else if (in_quote && (c == quote_c)) {
1195         in_quote = false;
1196       } else {
1197         token[pos++] = c;
1198       }
1199     }
1200     c = getc(stream);
1201   }
1202   if (pos > 0) {
1203     token[pos] = '\0';
1204     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1205     build_jvm_flags(token);
1206   }
1207   fclose(stream);
1208   return result;
1209 }
1210 
1211 //=============================================================================================================
1212 // Parsing of properties (-D)
1213 
1214 const char* Arguments::get_property(const char* key) {
1215   return PropertyList_get_value(system_properties(), key);
1216 }
1217 
1218 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1219   const char* eq = strchr(prop, '=');
1220   const char* key;
1221   const char* value = "";
1222 
1223   if (eq == NULL) {
1224     // property doesn't have a value, thus use passed string
1225     key = prop;
1226   } else {
1227     // property have a value, thus extract it and save to the
1228     // allocated string
1229     size_t key_len = eq - prop;
1230     char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1231 
1232     jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1233     key = tmp_key;
1234 
1235     value = &prop[key_len + 1];
1236   }
1237 
1238   if (strcmp(key, "java.compiler") == 0) {
1239     process_java_compiler_argument(value);
1240     // Record value in Arguments, but let it get passed to Java.
1241   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1242              strcmp(key, "sun.java.launcher.pid") == 0) {
1243     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1244     // private and are processed in process_sun_java_launcher_properties();
1245     // the sun.java.launcher property is passed on to the java application
1246   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1247     // append is true, writable is true, internal is false
1248     PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1249                             WriteableProperty, ExternalProperty);
1250   } else {
1251     if (strcmp(key, "sun.java.command") == 0) {
1252       char *old_java_command = _java_command;
1253       _java_command = os::strdup_check_oom(value, mtArguments);
1254       if (old_java_command != NULL) {
1255         os::free(old_java_command);
1256       }
1257     } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1258       const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1259       // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1260       // its value without going through the property list or making a Java call.
1261       _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1262       if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1263         assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1264         os::free((void *)old_java_vendor_url_bug);
1265       }
1266     }
1267 
1268     // Create new property and add at the end of the list
1269     PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1270   }
1271 
1272   if (key != prop) {
1273     // SystemProperty copy passed value, thus free previously allocated
1274     // memory
1275     FreeHeap((void *)key);
1276   }
1277 
1278   return true;
1279 }
1280 
1281 #if INCLUDE_CDS
1282 void Arguments::check_unsupported_dumping_properties() {
1283   assert(DumpSharedSpaces, "this function is only used with -Xshare:dump");
1284   const char* unsupported_properties[] = { "jdk.module.main",
1285                                            "jdk.module.limitmods",
1286                                            "jdk.module.path",
1287                                            "jdk.module.upgrade.path",
1288                                            "jdk.module.addmods.0",
1289                                            "jdk.module.patch.0" };
1290   const char* unsupported_options[] = { "-m", // cannot use at dump time
1291                                         "--limit-modules", // ignored at dump time
1292                                         "--module-path", // ignored at dump time
1293                                         "--upgrade-module-path", // ignored at dump time
1294                                         "--add-modules", // ignored at dump time
1295                                         "--patch-module" // ignored at dump time
1296                                       };
1297   assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1298   // If a vm option is found in the unsupported_options array with index less than the info_idx,
1299   // vm will exit with an error message. Otherwise, it will print an informational message if
1300   // PrintSharedSpaces is enabled.
1301   uint info_idx = 1;
1302   SystemProperty* sp = system_properties();
1303   while (sp != NULL) {
1304     for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1305       if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1306         if (i < info_idx) {
1307           vm_exit_during_initialization(
1308             "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1309         } else {
1310           if (PrintSharedSpaces) {
1311             tty->print_cr(
1312               "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]);
1313           }
1314         }
1315       }
1316     }
1317     sp = sp->next();
1318   }
1319 
1320   // Check for an exploded module build in use with -Xshare:dump.
1321   if (!has_jimage()) {
1322     vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1323   }
1324 }
1325 #endif
1326 
1327 //===========================================================================================================
1328 // Setting int/mixed/comp mode flags
1329 
1330 void Arguments::set_mode_flags(Mode mode) {
1331   // Set up default values for all flags.
1332   // If you add a flag to any of the branches below,
1333   // add a default value for it here.
1334   set_java_compiler(false);
1335   _mode                      = mode;
1336 
1337   // Ensure Agent_OnLoad has the correct initial values.
1338   // This may not be the final mode; mode may change later in onload phase.
1339   PropertyList_unique_add(&_system_properties, "java.vm.info",
1340                           VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1341 
1342   UseInterpreter             = true;
1343   UseCompiler                = true;
1344   UseLoopCounter             = true;
1345 
1346   // Default values may be platform/compiler dependent -
1347   // use the saved values
1348   ClipInlining               = Arguments::_ClipInlining;
1349   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1350   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1351   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1352   if (TieredCompilation) {
1353     if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1354       Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1355     }
1356     if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1357       Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1358     }
1359   }
1360 
1361   // Change from defaults based on mode
1362   switch (mode) {
1363   default:
1364     ShouldNotReachHere();
1365     break;
1366   case _int:
1367     UseCompiler              = false;
1368     UseLoopCounter           = false;
1369     AlwaysCompileLoopMethods = false;
1370     UseOnStackReplacement    = false;
1371     break;
1372   case _mixed:
1373     // same as default
1374     break;
1375   case _comp:
1376     UseInterpreter           = false;
1377     BackgroundCompilation    = false;
1378     ClipInlining             = false;
1379     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1380     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1381     // compile a level 4 (C2) and then continue executing it.
1382     if (TieredCompilation) {
1383       Tier3InvokeNotifyFreqLog = 0;
1384       Tier4InvocationThreshold = 0;
1385     }
1386     break;
1387   }
1388 }
1389 
1390 // Conflict: required to use shared spaces (-Xshare:on), but
1391 // incompatible command line options were chosen.
1392 static void no_shared_spaces(const char* message) {
1393   if (RequireSharedSpaces) {
1394     jio_fprintf(defaultStream::error_stream(),
1395       "Class data sharing is inconsistent with other specified options.\n");
1396     vm_exit_during_initialization("Unable to use shared archive.", message);
1397   } else {
1398     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1399   }
1400 }
1401 
1402 // Returns threshold scaled with the value of scale.
1403 // If scale < 0.0, threshold is returned without scaling.
1404 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1405   if (scale == 1.0 || scale < 0.0) {
1406     return threshold;
1407   } else {
1408     return (intx)(threshold * scale);
1409   }
1410 }
1411 
1412 // Returns freq_log scaled with the value of scale.
1413 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1414 // If scale < 0.0, freq_log is returned without scaling.
1415 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1416   // Check if scaling is necessary or if negative value was specified.
1417   if (scale == 1.0 || scale < 0.0) {
1418     return freq_log;
1419   }
1420   // Check values to avoid calculating log2 of 0.
1421   if (scale == 0.0 || freq_log == 0) {
1422     return 0;
1423   }
1424   // Determine the maximum notification frequency value currently supported.
1425   // The largest mask value that the interpreter/C1 can handle is
1426   // of length InvocationCounter::number_of_count_bits. Mask values are always
1427   // one bit shorter then the value of the notification frequency. Set
1428   // max_freq_bits accordingly.
1429   intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1430   intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1431   if (scaled_freq == 0) {
1432     // Return 0 right away to avoid calculating log2 of 0.
1433     return 0;
1434   } else if (scaled_freq > nth_bit(max_freq_bits)) {
1435     return max_freq_bits;
1436   } else {
1437     return log2_intptr(scaled_freq);
1438   }
1439 }
1440 
1441 void Arguments::set_tiered_flags() {
1442   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1443   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1444     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1445   }
1446   if (CompilationPolicyChoice < 2) {
1447     vm_exit_during_initialization(
1448       "Incompatible compilation policy selected", NULL);
1449   }
1450   // Increase the code cache size - tiered compiles a lot more.
1451   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1452     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1453                   MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1454   }
1455   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1456   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1457     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1458   }
1459   if (!UseInterpreter) { // -Xcomp
1460     Tier3InvokeNotifyFreqLog = 0;
1461     Tier4InvocationThreshold = 0;
1462   }
1463 
1464   if (CompileThresholdScaling < 0) {
1465     vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1466   }
1467 
1468   // Scale tiered compilation thresholds.
1469   // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1470   if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1471     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1472     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1473 
1474     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1475     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1476     FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1477     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1478 
1479     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1480     // once these thresholds become supported.
1481 
1482     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1483     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1484 
1485     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1486     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1487 
1488     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1489 
1490     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1491     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1492     FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1493     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1494   }
1495 }
1496 
1497 #if INCLUDE_ALL_GCS
1498 static void disable_adaptive_size_policy(const char* collector_name) {
1499   if (UseAdaptiveSizePolicy) {
1500     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1501       warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1502               collector_name);
1503     }
1504     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1505   }
1506 }
1507 
1508 void Arguments::set_parnew_gc_flags() {
1509   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1510          "control point invariant");
1511   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1512 
1513   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1514     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1515     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1516   } else if (ParallelGCThreads == 0) {
1517     jio_fprintf(defaultStream::error_stream(),
1518         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1519     vm_exit(1);
1520   }
1521 
1522   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1523   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1524   // we set them to 1024 and 1024.
1525   // See CR 6362902.
1526   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1527     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1528   }
1529   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1530     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1531   }
1532 
1533   // When using compressed oops, we use local overflow stacks,
1534   // rather than using a global overflow list chained through
1535   // the klass word of the object's pre-image.
1536   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1537     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1538       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1539     }
1540     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1541   }
1542   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1543 }
1544 
1545 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1546 // sparc/solaris for certain applications, but would gain from
1547 // further optimization and tuning efforts, and would almost
1548 // certainly gain from analysis of platform and environment.
1549 void Arguments::set_cms_and_parnew_gc_flags() {
1550   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1551   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1552 
1553   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1554   disable_adaptive_size_policy("UseConcMarkSweepGC");
1555 
1556   set_parnew_gc_flags();
1557 
1558   size_t max_heap = align_size_down(MaxHeapSize,
1559                                     CardTableRS::ct_max_alignment_constraint());
1560 
1561   // Now make adjustments for CMS
1562   intx   tenuring_default = (intx)6;
1563   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1564 
1565   // Preferred young gen size for "short" pauses:
1566   // upper bound depends on # of threads and NewRatio.
1567   const size_t preferred_max_new_size_unaligned =
1568     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1569   size_t preferred_max_new_size =
1570     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1571 
1572   // Unless explicitly requested otherwise, size young gen
1573   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1574 
1575   // If either MaxNewSize or NewRatio is set on the command line,
1576   // assume the user is trying to set the size of the young gen.
1577   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1578 
1579     // Set MaxNewSize to our calculated preferred_max_new_size unless
1580     // NewSize was set on the command line and it is larger than
1581     // preferred_max_new_size.
1582     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1583       FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1584     } else {
1585       FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1586     }
1587     log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1588 
1589     // Code along this path potentially sets NewSize and OldSize
1590     log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size:  " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1591                         min_heap_size(), InitialHeapSize, max_heap);
1592     size_t min_new = preferred_max_new_size;
1593     if (FLAG_IS_CMDLINE(NewSize)) {
1594       min_new = NewSize;
1595     }
1596     if (max_heap > min_new && min_heap_size() > min_new) {
1597       // Unless explicitly requested otherwise, make young gen
1598       // at least min_new, and at most preferred_max_new_size.
1599       if (FLAG_IS_DEFAULT(NewSize)) {
1600         FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1601         FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1602         log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1603       }
1604       // Unless explicitly requested otherwise, size old gen
1605       // so it's NewRatio x of NewSize.
1606       if (FLAG_IS_DEFAULT(OldSize)) {
1607         if (max_heap > NewSize) {
1608           FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1609           log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1610         }
1611       }
1612     }
1613   }
1614   // Unless explicitly requested otherwise, definitely
1615   // promote all objects surviving "tenuring_default" scavenges.
1616   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1617       FLAG_IS_DEFAULT(SurvivorRatio)) {
1618     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1619   }
1620   // If we decided above (or user explicitly requested)
1621   // `promote all' (via MaxTenuringThreshold := 0),
1622   // prefer minuscule survivor spaces so as not to waste
1623   // space for (non-existent) survivors
1624   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1625     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1626   }
1627 
1628   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1629   // but rather the number of free blocks of a given size that are used when
1630   // replenishing the local per-worker free list caches.
1631   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1632     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1633       // OldPLAB sizing manually turned off: Use a larger default setting,
1634       // unless it was manually specified. This is because a too-low value
1635       // will slow down scavenges.
1636       FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1637     } else {
1638       FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1639     }
1640   }
1641 
1642   // If either of the static initialization defaults have changed, note this
1643   // modification.
1644   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1645     CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1646   }
1647 
1648   log_trace(gc)("MarkStackSize: %uk  MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1649 }
1650 #endif // INCLUDE_ALL_GCS
1651 
1652 void set_object_alignment() {
1653   // Object alignment.
1654   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1655   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1656   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1657   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1658   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1659   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1660 
1661   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1662   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1663 
1664   // Oop encoding heap max
1665   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1666 
1667   if (SurvivorAlignmentInBytes == 0) {
1668     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1669   }
1670 
1671 #if INCLUDE_ALL_GCS
1672   // Set CMS global values
1673   CompactibleFreeListSpace::set_cms_values();
1674 #endif // INCLUDE_ALL_GCS
1675 }
1676 
1677 size_t Arguments::max_heap_for_compressed_oops() {
1678   // Avoid sign flip.
1679   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1680   // We need to fit both the NULL page and the heap into the memory budget, while
1681   // keeping alignment constraints of the heap. To guarantee the latter, as the
1682   // NULL page is located before the heap, we pad the NULL page to the conservative
1683   // maximum alignment that the GC may ever impose upon the heap.
1684   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1685                                                         _conservative_max_heap_alignment);
1686 
1687   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1688   NOT_LP64(ShouldNotReachHere(); return 0);
1689 }
1690 
1691 void Arguments::set_use_compressed_oops() {
1692 #ifndef ZERO
1693 #ifdef _LP64
1694   // MaxHeapSize is not set up properly at this point, but
1695   // the only value that can override MaxHeapSize if we are
1696   // to use UseCompressedOops is InitialHeapSize.
1697   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1698 
1699   if (max_heap_size <= max_heap_for_compressed_oops()) {
1700 #if !defined(COMPILER1) || defined(TIERED)
1701     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1702       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1703     }
1704 #endif
1705   } else {
1706     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1707       warning("Max heap size too large for Compressed Oops");
1708       FLAG_SET_DEFAULT(UseCompressedOops, false);
1709       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1710     }
1711   }
1712 #endif // _LP64
1713 #endif // ZERO
1714 }
1715 
1716 
1717 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1718 // set_use_compressed_oops().
1719 void Arguments::set_use_compressed_klass_ptrs() {
1720 #ifndef ZERO
1721 #ifdef _LP64
1722   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1723   if (!UseCompressedOops) {
1724     if (UseCompressedClassPointers) {
1725       warning("UseCompressedClassPointers requires UseCompressedOops");
1726     }
1727     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1728   } else {
1729     // Turn on UseCompressedClassPointers too
1730     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1731       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1732     }
1733     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1734     if (UseCompressedClassPointers) {
1735       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1736         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1737         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1738       }
1739     }
1740   }
1741 #endif // _LP64
1742 #endif // !ZERO
1743 }
1744 
1745 void Arguments::set_conservative_max_heap_alignment() {
1746   // The conservative maximum required alignment for the heap is the maximum of
1747   // the alignments imposed by several sources: any requirements from the heap
1748   // itself, the collector policy and the maximum page size we may run the VM
1749   // with.
1750   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1751 #if INCLUDE_ALL_GCS
1752   if (UseParallelGC) {
1753     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1754   } else if (UseG1GC) {
1755     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1756   }
1757 #endif // INCLUDE_ALL_GCS
1758   _conservative_max_heap_alignment = MAX4(heap_alignment,
1759                                           (size_t)os::vm_allocation_granularity(),
1760                                           os::max_page_size(),
1761                                           CollectorPolicy::compute_heap_alignment());
1762 }
1763 
1764 bool Arguments::gc_selected() {
1765 #if INCLUDE_ALL_GCS
1766   return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC;
1767 #else
1768   return UseSerialGC;
1769 #endif // INCLUDE_ALL_GCS
1770 }
1771 
1772 #ifdef TIERED
1773 bool Arguments::compilation_mode_selected() {
1774  return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) ||
1775         !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler));
1776 
1777 }
1778 
1779 void Arguments::select_compilation_mode_ergonomically() {
1780 #if defined(_WINDOWS) && !defined(_LP64)
1781   if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) {
1782     FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true);
1783   }
1784 #endif
1785   if (NeverActAsServerClassMachine) {
1786     set_client_compilation_mode();
1787   }
1788 }
1789 #endif //TIERED
1790 
1791 void Arguments::select_gc_ergonomically() {
1792 #if INCLUDE_ALL_GCS
1793   if (os::is_server_class_machine()) {
1794     FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
1795   } else {
1796     FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1797   }
1798 #else
1799   UNSUPPORTED_OPTION(UseG1GC);
1800   UNSUPPORTED_OPTION(UseParallelGC);
1801   UNSUPPORTED_OPTION(UseParallelOldGC);
1802   UNSUPPORTED_OPTION(UseConcMarkSweepGC);
1803   FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true);
1804 #endif // INCLUDE_ALL_GCS
1805 }
1806 
1807 void Arguments::select_gc() {
1808   if (!gc_selected()) {
1809     select_gc_ergonomically();
1810     if (!gc_selected()) {
1811       vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL);
1812     }
1813   }
1814 }
1815 
1816 #if INCLUDE_JVMCI
1817 void Arguments::set_jvmci_specific_flags() {
1818   if (UseJVMCICompiler) {
1819     if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
1820       FLAG_SET_DEFAULT(TypeProfileWidth, 8);
1821     }
1822     if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) {
1823       FLAG_SET_DEFAULT(OnStackReplacePercentage, 933);
1824     }
1825     if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1826       FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M);
1827     }
1828     if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) {
1829       FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M);
1830     }
1831     if (FLAG_IS_DEFAULT(MetaspaceSize)) {
1832       FLAG_SET_DEFAULT(MetaspaceSize, 12*M);
1833     }
1834     if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) {
1835       FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K);
1836     }
1837     if (TieredStopAtLevel != CompLevel_full_optimization) {
1838       // Currently JVMCI compiler can only work at the full optimization level
1839       warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled");
1840       TieredStopAtLevel = CompLevel_full_optimization;
1841     }
1842     if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
1843       FLAG_SET_DEFAULT(TypeProfileLevel, 0);
1844     }
1845   }
1846 }
1847 #endif
1848 
1849 void Arguments::set_ergonomics_flags() {
1850 #ifdef TIERED
1851   if (!compilation_mode_selected()) {
1852     select_compilation_mode_ergonomically();
1853   }
1854 #endif
1855   select_gc();
1856 
1857 #if defined(COMPILER2) || INCLUDE_JVMCI
1858   // Shared spaces work fine with other GCs but causes bytecode rewriting
1859   // to be disabled, which hurts interpreter performance and decreases
1860   // server performance.  When -server is specified, keep the default off
1861   // unless it is asked for.  Future work: either add bytecode rewriting
1862   // at link time, or rewrite bytecodes in non-shared methods.
1863   if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces &&
1864       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1865     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1866   }
1867 #endif
1868 
1869   set_conservative_max_heap_alignment();
1870 
1871 #ifndef ZERO
1872 #ifdef _LP64
1873   set_use_compressed_oops();
1874 
1875   // set_use_compressed_klass_ptrs() must be called after calling
1876   // set_use_compressed_oops().
1877   set_use_compressed_klass_ptrs();
1878 
1879   // Also checks that certain machines are slower with compressed oops
1880   // in vm_version initialization code.
1881 #endif // _LP64
1882 #endif // !ZERO
1883 
1884 }
1885 
1886 void Arguments::set_parallel_gc_flags() {
1887   assert(UseParallelGC || UseParallelOldGC, "Error");
1888   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1889   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1890     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1891   }
1892   FLAG_SET_DEFAULT(UseParallelGC, true);
1893 
1894   // If no heap maximum was requested explicitly, use some reasonable fraction
1895   // of the physical memory, up to a maximum of 1GB.
1896   FLAG_SET_DEFAULT(ParallelGCThreads,
1897                    Abstract_VM_Version::parallel_worker_threads());
1898   if (ParallelGCThreads == 0) {
1899     jio_fprintf(defaultStream::error_stream(),
1900         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1901     vm_exit(1);
1902   }
1903 
1904   if (UseAdaptiveSizePolicy) {
1905     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1906     // unless the user actually sets these flags.
1907     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1908       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1909     }
1910     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1911       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1912     }
1913   }
1914 
1915   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1916   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1917   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1918   // See CR 6362902 for details.
1919   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1920     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1921        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1922     }
1923     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1924       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1925     }
1926   }
1927 
1928   if (UseParallelOldGC) {
1929     // Par compact uses lower default values since they are treated as
1930     // minimums.  These are different defaults because of the different
1931     // interpretation and are not ergonomically set.
1932     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1933       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1934     }
1935   }
1936 }
1937 
1938 void Arguments::set_g1_gc_flags() {
1939   assert(UseG1GC, "Error");
1940 #if defined(COMPILER1) || INCLUDE_JVMCI
1941   FastTLABRefill = false;
1942 #endif
1943   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1944   if (ParallelGCThreads == 0) {
1945     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1946     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1947   }
1948 
1949 #if INCLUDE_ALL_GCS
1950   if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) {
1951     FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads);
1952   }
1953 #endif
1954 
1955   // MarkStackSize will be set (if it hasn't been set by the user)
1956   // when concurrent marking is initialized.
1957   // Its value will be based upon the number of parallel marking threads.
1958   // But we do set the maximum mark stack size here.
1959   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1960     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1961   }
1962 
1963   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1964     // In G1, we want the default GC overhead goal to be higher than
1965     // it is for PS, or the heap might be expanded too aggressively.
1966     // We set it here to ~8%.
1967     FLAG_SET_DEFAULT(GCTimeRatio, 12);
1968   }
1969 
1970   // Below, we might need to calculate the pause time interval based on
1971   // the pause target. When we do so we are going to give G1 maximum
1972   // flexibility and allow it to do pauses when it needs to. So, we'll
1973   // arrange that the pause interval to be pause time target + 1 to
1974   // ensure that a) the pause time target is maximized with respect to
1975   // the pause interval and b) we maintain the invariant that pause
1976   // time target < pause interval. If the user does not want this
1977   // maximum flexibility, they will have to set the pause interval
1978   // explicitly.
1979 
1980   if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1981     // The default pause time target in G1 is 200ms
1982     FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1983   }
1984 
1985   // Then, if the interval parameter was not set, set it according to
1986   // the pause time target (this will also deal with the case when the
1987   // pause time target is the default value).
1988   if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
1989     FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
1990   }
1991 
1992   log_trace(gc)("MarkStackSize: %uk  MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1993 }
1994 
1995 void Arguments::set_gc_specific_flags() {
1996 #if INCLUDE_ALL_GCS
1997   // Set per-collector flags
1998   if (UseParallelGC || UseParallelOldGC) {
1999     set_parallel_gc_flags();
2000   } else if (UseConcMarkSweepGC) {
2001     set_cms_and_parnew_gc_flags();
2002   } else if (UseG1GC) {
2003     set_g1_gc_flags();
2004   }
2005   if (AssumeMP && !UseSerialGC) {
2006     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
2007       warning("If the number of processors is expected to increase from one, then"
2008               " you should configure the number of parallel GC threads appropriately"
2009               " using -XX:ParallelGCThreads=N");
2010     }
2011   }
2012   if (MinHeapFreeRatio == 100) {
2013     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2014     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2015   }
2016 
2017   // If class unloading is disabled, also disable concurrent class unloading.
2018   if (!ClassUnloading) {
2019     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
2020     FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
2021   }
2022 #endif // INCLUDE_ALL_GCS
2023 }
2024 
2025 julong Arguments::limit_by_allocatable_memory(julong limit) {
2026   julong max_allocatable;
2027   julong result = limit;
2028   if (os::has_allocatable_memory_limit(&max_allocatable)) {
2029     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2030   }
2031   return result;
2032 }
2033 
2034 // Use static initialization to get the default before parsing
2035 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2036 
2037 void Arguments::set_heap_size() {
2038   julong phys_mem =
2039     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2040                             : (julong)MaxRAM;
2041 
2042   // Experimental support for CGroup memory limits
2043   if (UseCGroupMemoryLimitForHeap) {
2044     // This is a rough indicator that a CGroup limit may be in force
2045     // for this process
2046     const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
2047     FILE *fp = fopen(lim_file, "r");
2048     if (fp != NULL) {
2049       julong cgroup_max = 0;
2050       int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2051       if (ret == 1 && cgroup_max > 0) {
2052         // If unlimited, cgroup_max will be a very large, but unspecified
2053         // value, so use initial phys_mem as a limit
2054         log_info(gc, heap)("Setting phys_mem to the min of cgroup limit ("
2055                            JULONG_FORMAT "MB) and initial phys_mem ("
2056                            JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2057         phys_mem = MIN2(cgroup_max, phys_mem);
2058       } else {
2059         warning("Unable to read/parse cgroup memory limit from %s: %s",
2060                 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2061       }
2062       fclose(fp);
2063     } else {
2064       warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2065     }
2066   }
2067 
2068   // If the maximum heap size has not been set with -Xmx,
2069   // then set it as fraction of the size of physical memory,
2070   // respecting the maximum and minimum sizes of the heap.
2071   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2072     julong reasonable_max = phys_mem / MaxRAMFraction;
2073 
2074     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2075       // Small physical memory, so use a minimum fraction of it for the heap
2076       reasonable_max = phys_mem / MinRAMFraction;
2077     } else {
2078       // Not-small physical memory, so require a heap at least
2079       // as large as MaxHeapSize
2080       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2081     }
2082     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2083       // Limit the heap size to ErgoHeapSizeLimit
2084       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2085     }
2086     if (UseCompressedOops) {
2087       // Limit the heap size to the maximum possible when using compressed oops
2088       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2089 
2090       // HeapBaseMinAddress can be greater than default but not less than.
2091       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2092         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2093           // matches compressed oops printing flags
2094           log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
2095                                      " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
2096                                      DefaultHeapBaseMinAddress,
2097                                      DefaultHeapBaseMinAddress/G,
2098                                      HeapBaseMinAddress);
2099           FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2100         }
2101       }
2102 
2103       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2104         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2105         // but it should be not less than default MaxHeapSize.
2106         max_coop_heap -= HeapBaseMinAddress;
2107       }
2108       reasonable_max = MIN2(reasonable_max, max_coop_heap);
2109     }
2110     reasonable_max = limit_by_allocatable_memory(reasonable_max);
2111 
2112     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2113       // An initial heap size was specified on the command line,
2114       // so be sure that the maximum size is consistent.  Done
2115       // after call to limit_by_allocatable_memory because that
2116       // method might reduce the allocation size.
2117       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2118     }
2119 
2120     log_trace(gc, heap)("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2121     FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2122   }
2123 
2124   // If the minimum or initial heap_size have not been set or requested to be set
2125   // ergonomically, set them accordingly.
2126   if (InitialHeapSize == 0 || min_heap_size() == 0) {
2127     julong reasonable_minimum = (julong)(OldSize + NewSize);
2128 
2129     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2130 
2131     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2132 
2133     if (InitialHeapSize == 0) {
2134       julong reasonable_initial = phys_mem / InitialRAMFraction;
2135 
2136       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2137       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2138 
2139       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2140 
2141       log_trace(gc, heap)("  Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2142       FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2143     }
2144     // If the minimum heap size has not been set (via -Xms),
2145     // synchronize with InitialHeapSize to avoid errors with the default value.
2146     if (min_heap_size() == 0) {
2147       set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2148       log_trace(gc, heap)("  Minimum heap size " SIZE_FORMAT, min_heap_size());
2149     }
2150   }
2151 }
2152 
2153 // This option inspects the machine and attempts to set various
2154 // parameters to be optimal for long-running, memory allocation
2155 // intensive jobs.  It is intended for machines with large
2156 // amounts of cpu and memory.
2157 jint Arguments::set_aggressive_heap_flags() {
2158   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2159   // VM, but we may not be able to represent the total physical memory
2160   // available (like having 8gb of memory on a box but using a 32bit VM).
2161   // Thus, we need to make sure we're using a julong for intermediate
2162   // calculations.
2163   julong initHeapSize;
2164   julong total_memory = os::physical_memory();
2165 
2166   if (total_memory < (julong) 256 * M) {
2167     jio_fprintf(defaultStream::error_stream(),
2168             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2169     vm_exit(1);
2170   }
2171 
2172   // The heap size is half of available memory, or (at most)
2173   // all of possible memory less 160mb (leaving room for the OS
2174   // when using ISM).  This is the maximum; because adaptive sizing
2175   // is turned on below, the actual space used may be smaller.
2176 
2177   initHeapSize = MIN2(total_memory / (julong) 2,
2178           total_memory - (julong) 160 * M);
2179 
2180   initHeapSize = limit_by_allocatable_memory(initHeapSize);
2181 
2182   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2183     if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2184       return JNI_EINVAL;
2185     }
2186     if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2187       return JNI_EINVAL;
2188     }
2189     // Currently the minimum size and the initial heap sizes are the same.
2190     set_min_heap_size(initHeapSize);
2191   }
2192   if (FLAG_IS_DEFAULT(NewSize)) {
2193     // Make the young generation 3/8ths of the total heap.
2194     if (FLAG_SET_CMDLINE(size_t, NewSize,
2195             ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2196       return JNI_EINVAL;
2197     }
2198     if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2199       return JNI_EINVAL;
2200     }
2201   }
2202 
2203 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
2204   FLAG_SET_DEFAULT(UseLargePages, true);
2205 #endif
2206 
2207   // Increase some data structure sizes for efficiency
2208   if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2209     return JNI_EINVAL;
2210   }
2211   if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2212     return JNI_EINVAL;
2213   }
2214   if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2215     return JNI_EINVAL;
2216   }
2217 
2218   // See the OldPLABSize comment below, but replace 'after promotion'
2219   // with 'after copying'.  YoungPLABSize is the size of the survivor
2220   // space per-gc-thread buffers.  The default is 4kw.
2221   if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2222     return JNI_EINVAL;
2223   }
2224 
2225   // OldPLABSize is the size of the buffers in the old gen that
2226   // UseParallelGC uses to promote live data that doesn't fit in the
2227   // survivor spaces.  At any given time, there's one for each gc thread.
2228   // The default size is 1kw. These buffers are rarely used, since the
2229   // survivor spaces are usually big enough.  For specjbb, however, there
2230   // are occasions when there's lots of live data in the young gen
2231   // and we end up promoting some of it.  We don't have a definite
2232   // explanation for why bumping OldPLABSize helps, but the theory
2233   // is that a bigger PLAB results in retaining something like the
2234   // original allocation order after promotion, which improves mutator
2235   // locality.  A minor effect may be that larger PLABs reduce the
2236   // number of PLAB allocation events during gc.  The value of 8kw
2237   // was arrived at by experimenting with specjbb.
2238   if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2239     return JNI_EINVAL;
2240   }
2241 
2242   // Enable parallel GC and adaptive generation sizing
2243   if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2244     return JNI_EINVAL;
2245   }
2246   FLAG_SET_DEFAULT(ParallelGCThreads,
2247           Abstract_VM_Version::parallel_worker_threads());
2248 
2249   // Encourage steady state memory management
2250   if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2251     return JNI_EINVAL;
2252   }
2253 
2254   // This appears to improve mutator locality
2255   if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2256     return JNI_EINVAL;
2257   }
2258 
2259   // Get around early Solaris scheduling bug
2260   // (affinity vs other jobs on system)
2261   // but disallow DR and offlining (5008695).
2262   if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2263     return JNI_EINVAL;
2264   }
2265 
2266   return JNI_OK;
2267 }
2268 
2269 // This must be called after ergonomics.
2270 void Arguments::set_bytecode_flags() {
2271   if (!RewriteBytecodes) {
2272     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2273   }
2274 }
2275 
2276 // Aggressive optimization flags  -XX:+AggressiveOpts
2277 jint Arguments::set_aggressive_opts_flags() {
2278 #ifdef COMPILER2
2279   if (AggressiveUnboxing) {
2280     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2281       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2282     } else if (!EliminateAutoBox) {
2283       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2284       AggressiveUnboxing = false;
2285     }
2286     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2287       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2288     } else if (!DoEscapeAnalysis) {
2289       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2290       AggressiveUnboxing = false;
2291     }
2292   }
2293   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2294     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2295       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2296     }
2297     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2298       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2299     }
2300 
2301     // Feed the cache size setting into the JDK
2302     char buffer[1024];
2303     jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2304     if (!add_property(buffer)) {
2305       return JNI_ENOMEM;
2306     }
2307   }
2308   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2309     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2310   }
2311 #endif
2312 
2313   if (AggressiveOpts) {
2314 // Sample flag setting code
2315 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2316 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
2317 //    }
2318   }
2319 
2320   return JNI_OK;
2321 }
2322 
2323 //===========================================================================================================
2324 // Parsing of java.compiler property
2325 
2326 void Arguments::process_java_compiler_argument(const char* arg) {
2327   // For backwards compatibility, Djava.compiler=NONE or ""
2328   // causes us to switch to -Xint mode UNLESS -Xdebug
2329   // is also specified.
2330   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2331     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2332   }
2333 }
2334 
2335 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2336   _sun_java_launcher = os::strdup_check_oom(launcher);
2337 }
2338 
2339 bool Arguments::created_by_java_launcher() {
2340   assert(_sun_java_launcher != NULL, "property must have value");
2341   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2342 }
2343 
2344 bool Arguments::sun_java_launcher_is_altjvm() {
2345   return _sun_java_launcher_is_altjvm;
2346 }
2347 
2348 //===========================================================================================================
2349 // Parsing of main arguments
2350 
2351 #if INCLUDE_JVMCI
2352 // Check consistency of jvmci vm argument settings.
2353 bool Arguments::check_jvmci_args_consistency() {
2354    return JVMCIGlobals::check_jvmci_flags_are_consistent();
2355 }
2356 #endif //INCLUDE_JVMCI
2357 
2358 // Check consistency of GC selection
2359 bool Arguments::check_gc_consistency() {
2360   // Ensure that the user has not selected conflicting sets
2361   // of collectors.
2362   uint i = 0;
2363   if (UseSerialGC)                       i++;
2364   if (UseConcMarkSweepGC)                i++;
2365   if (UseParallelGC || UseParallelOldGC) i++;
2366   if (UseG1GC)                           i++;
2367   if (i > 1) {
2368     jio_fprintf(defaultStream::error_stream(),
2369                 "Conflicting collector combinations in option list; "
2370                 "please refer to the release notes for the combinations "
2371                 "allowed\n");
2372     return false;
2373   }
2374 
2375   return true;
2376 }
2377 
2378 // Check the consistency of vm_init_args
2379 bool Arguments::check_vm_args_consistency() {
2380   // Method for adding checks for flag consistency.
2381   // The intent is to warn the user of all possible conflicts,
2382   // before returning an error.
2383   // Note: Needs platform-dependent factoring.
2384   bool status = true;
2385 
2386   if (TLABRefillWasteFraction == 0) {
2387     jio_fprintf(defaultStream::error_stream(),
2388                 "TLABRefillWasteFraction should be a denominator, "
2389                 "not " SIZE_FORMAT "\n",
2390                 TLABRefillWasteFraction);
2391     status = false;
2392   }
2393 
2394   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2395     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2396   }
2397 
2398   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2399     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2400   }
2401 
2402   if (GCTimeLimit == 100) {
2403     // Turn off gc-overhead-limit-exceeded checks
2404     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2405   }
2406 
2407   status = status && check_gc_consistency();
2408 
2409   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2410   // insists that we hold the requisite locks so that the iteration is
2411   // MT-safe. For the verification at start-up and shut-down, we don't
2412   // yet have a good way of acquiring and releasing these locks,
2413   // which are not visible at the CollectedHeap level. We want to
2414   // be able to acquire these locks and then do the iteration rather
2415   // than just disable the lock verification. This will be fixed under
2416   // bug 4788986.
2417   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2418     if (VerifyDuringStartup) {
2419       warning("Heap verification at start-up disabled "
2420               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2421       VerifyDuringStartup = false; // Disable verification at start-up
2422     }
2423 
2424     if (VerifyBeforeExit) {
2425       warning("Heap verification at shutdown disabled "
2426               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2427       VerifyBeforeExit = false; // Disable verification at shutdown
2428     }
2429   }
2430 
2431   if (PrintNMTStatistics) {
2432 #if INCLUDE_NMT
2433     if (MemTracker::tracking_level() == NMT_off) {
2434 #endif // INCLUDE_NMT
2435       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2436       PrintNMTStatistics = false;
2437 #if INCLUDE_NMT
2438     }
2439 #endif
2440   }
2441 
2442 #if INCLUDE_JVMCI
2443   status = status && check_jvmci_args_consistency();
2444 
2445   if (EnableJVMCI) {
2446     if (!ScavengeRootsInCode) {
2447       warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2448       ScavengeRootsInCode = 1;
2449     }
2450   }
2451 #endif
2452 
2453   // Check lower bounds of the code cache
2454   // Template Interpreter code is approximately 3X larger in debug builds.
2455   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2456   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2457     jio_fprintf(defaultStream::error_stream(),
2458                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2459                 os::vm_page_size()/K);
2460     status = false;
2461   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2462     jio_fprintf(defaultStream::error_stream(),
2463                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2464                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2465     status = false;
2466   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2467     jio_fprintf(defaultStream::error_stream(),
2468                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2469                 min_code_cache_size/K);
2470     status = false;
2471   } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2472     // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2473     jio_fprintf(defaultStream::error_stream(),
2474                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2475                 CODE_CACHE_SIZE_LIMIT/M);
2476     status = false;
2477   } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2478     jio_fprintf(defaultStream::error_stream(),
2479                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2480                 min_code_cache_size/K);
2481     status = false;
2482   }
2483 
2484 #ifdef _LP64
2485   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2486     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2487   }
2488 #endif
2489 
2490 #ifndef SUPPORT_RESERVED_STACK_AREA
2491   if (StackReservedPages != 0) {
2492     FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2493     warning("Reserved Stack Area not supported on this platform");
2494   }
2495 #endif
2496 
2497   if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) {
2498     if (!FLAG_IS_DEFAULT(BackgroundCompilation)) {
2499       warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options.");
2500     }
2501     FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2502   }
2503   if (UseCompiler && is_interpreter_only()) {
2504     if (!FLAG_IS_DEFAULT(UseCompiler)) {
2505       warning("UseCompiler disabled due to -Xint.");
2506     }
2507     FLAG_SET_CMDLINE(bool, UseCompiler, false);
2508   }
2509 #ifdef COMPILER2
2510   if (PostLoopMultiversioning && !RangeCheckElimination) {
2511     if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) {
2512       warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled.");
2513     }
2514     FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
2515   }
2516 #endif
2517   return status;
2518 }
2519 
2520 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2521   const char* option_type) {
2522   if (ignore) return false;
2523 
2524   const char* spacer = " ";
2525   if (option_type == NULL) {
2526     option_type = ++spacer; // Set both to the empty string.
2527   }
2528 
2529   if (os::obsolete_option(option)) {
2530     jio_fprintf(defaultStream::error_stream(),
2531                 "Obsolete %s%soption: %s\n", option_type, spacer,
2532       option->optionString);
2533     return false;
2534   } else {
2535     jio_fprintf(defaultStream::error_stream(),
2536                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2537       option->optionString);
2538     return true;
2539   }
2540 }
2541 
2542 static const char* user_assertion_options[] = {
2543   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2544 };
2545 
2546 static const char* system_assertion_options[] = {
2547   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2548 };
2549 
2550 bool Arguments::parse_uintx(const char* value,
2551                             uintx* uintx_arg,
2552                             uintx min_size) {
2553 
2554   // Check the sign first since atojulong() parses only unsigned values.
2555   bool value_is_positive = !(*value == '-');
2556 
2557   if (value_is_positive) {
2558     julong n;
2559     bool good_return = atojulong(value, &n);
2560     if (good_return) {
2561       bool above_minimum = n >= min_size;
2562       bool value_is_too_large = n > max_uintx;
2563 
2564       if (above_minimum && !value_is_too_large) {
2565         *uintx_arg = n;
2566         return true;
2567       }
2568     }
2569   }
2570   return false;
2571 }
2572 
2573 unsigned int addreads_count = 0;
2574 unsigned int addexports_count = 0;
2575 unsigned int addopens_count = 0;
2576 unsigned int addmods_count = 0;
2577 unsigned int patch_mod_count = 0;
2578 
2579 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2580   size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2581   char* property = AllocateHeap(prop_len, mtArguments);
2582   int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2583   if (ret < 0 || ret >= (int)prop_len) {
2584     FreeHeap(property);
2585     return false;
2586   }
2587   bool added = add_property(property, UnwriteableProperty, internal);
2588   FreeHeap(property);
2589   return added;
2590 }
2591 
2592 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2593   const unsigned int props_count_limit = 1000;
2594   const int max_digits = 3;
2595   const int extra_symbols_count = 3; // includes '.', '=', '\0'
2596 
2597   // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2598   if (count < props_count_limit) {
2599     size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2600     char* property = AllocateHeap(prop_len, mtArguments);
2601     int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2602     if (ret < 0 || ret >= (int)prop_len) {
2603       FreeHeap(property);
2604       jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2605       return false;
2606     }
2607     bool added = add_property(property, UnwriteableProperty, InternalProperty);
2608     FreeHeap(property);
2609     return added;
2610   }
2611 
2612   jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2613   return false;
2614 }
2615 
2616 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2617                                                   julong* long_arg,
2618                                                   julong min_size) {
2619   if (!atojulong(s, long_arg)) return arg_unreadable;
2620   return check_memory_size(*long_arg, min_size);
2621 }
2622 
2623 // Parse JavaVMInitArgs structure
2624 
2625 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2626                                    const JavaVMInitArgs *java_options_args,
2627                                    const JavaVMInitArgs *cmd_line_args) {
2628   bool patch_mod_javabase = false;
2629 
2630   // Save default settings for some mode flags
2631   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2632   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2633   Arguments::_ClipInlining             = ClipInlining;
2634   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2635   if (TieredCompilation) {
2636     Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2637     Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2638   }
2639 
2640   // Setup flags for mixed which is the default
2641   set_mode_flags(_mixed);
2642 
2643   // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2644   // variable (if present).
2645   jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2646   if (result != JNI_OK) {
2647     return result;
2648   }
2649 
2650   // Parse args structure generated from the command line flags.
2651   result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE);
2652   if (result != JNI_OK) {
2653     return result;
2654   }
2655 
2656   // Parse args structure generated from the _JAVA_OPTIONS environment
2657   // variable (if present) (mimics classic VM)
2658   result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR);
2659   if (result != JNI_OK) {
2660     return result;
2661   }
2662 
2663   // Do final processing now that all arguments have been parsed
2664   result = finalize_vm_init_args();
2665   if (result != JNI_OK) {
2666     return result;
2667   }
2668 
2669 #if INCLUDE_CDS
2670   if (UseSharedSpaces && patch_mod_javabase) {
2671     no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
2672   }
2673 #endif
2674 
2675   return JNI_OK;
2676 }
2677 
2678 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2679 // represents a valid JDWP agent.  is_path==true denotes that we
2680 // are dealing with -agentpath (case where name is a path), otherwise with
2681 // -agentlib
2682 bool valid_jdwp_agent(char *name, bool is_path) {
2683   char *_name;
2684   const char *_jdwp = "jdwp";
2685   size_t _len_jdwp, _len_prefix;
2686 
2687   if (is_path) {
2688     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2689       return false;
2690     }
2691 
2692     _name++;  // skip past last path separator
2693     _len_prefix = strlen(JNI_LIB_PREFIX);
2694 
2695     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2696       return false;
2697     }
2698 
2699     _name += _len_prefix;
2700     _len_jdwp = strlen(_jdwp);
2701 
2702     if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2703       _name += _len_jdwp;
2704     }
2705     else {
2706       return false;
2707     }
2708 
2709     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2710       return false;
2711     }
2712 
2713     return true;
2714   }
2715 
2716   if (strcmp(name, _jdwp) == 0) {
2717     return true;
2718   }
2719 
2720   return false;
2721 }
2722 
2723 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2724   // --patch-module=<module>=<file>(<pathsep><file>)*
2725   assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2726   // Find the equal sign between the module name and the path specification
2727   const char* module_equal = strchr(patch_mod_tail, '=');
2728   if (module_equal == NULL) {
2729     jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2730     return JNI_ERR;
2731   } else {
2732     // Pick out the module name
2733     size_t module_len = module_equal - patch_mod_tail;
2734     char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2735     if (module_name != NULL) {
2736       memcpy(module_name, patch_mod_tail, module_len);
2737       *(module_name + module_len) = '\0';
2738       // The path piece begins one past the module_equal sign
2739       add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2740       FREE_C_HEAP_ARRAY(char, module_name);
2741       if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2742         return JNI_ENOMEM;
2743       }
2744     } else {
2745       return JNI_ENOMEM;
2746     }
2747   }
2748   return JNI_OK;
2749 }
2750 
2751 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) {
2752   // For match_option to return remaining or value part of option string
2753   const char* tail;
2754 
2755   // iterate over arguments
2756   for (int index = 0; index < args->nOptions; index++) {
2757     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2758 
2759     const JavaVMOption* option = args->options + index;
2760 
2761     if (!match_option(option, "-Djava.class.path", &tail) &&
2762         !match_option(option, "-Dsun.java.command", &tail) &&
2763         !match_option(option, "-Dsun.java.launcher", &tail)) {
2764 
2765         // add all jvm options to the jvm_args string. This string
2766         // is used later to set the java.vm.args PerfData string constant.
2767         // the -Djava.class.path and the -Dsun.java.command options are
2768         // omitted from jvm_args string as each have their own PerfData
2769         // string constant object.
2770         build_jvm_args(option->optionString);
2771     }
2772 
2773     // -verbose:[class/gc/jni]
2774     if (match_option(option, "-verbose", &tail)) {
2775       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2776         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2777         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2778       } else if (!strcmp(tail, ":gc")) {
2779         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2780       } else if (!strcmp(tail, ":jni")) {
2781         if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2782           return JNI_EINVAL;
2783         }
2784       }
2785     // -da / -ea / -disableassertions / -enableassertions
2786     // These accept an optional class/package name separated by a colon, e.g.,
2787     // -da:java.lang.Thread.
2788     } else if (match_option(option, user_assertion_options, &tail, true)) {
2789       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2790       if (*tail == '\0') {
2791         JavaAssertions::setUserClassDefault(enable);
2792       } else {
2793         assert(*tail == ':', "bogus match by match_option()");
2794         JavaAssertions::addOption(tail + 1, enable);
2795       }
2796     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2797     } else if (match_option(option, system_assertion_options, &tail, false)) {
2798       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2799       JavaAssertions::setSystemClassDefault(enable);
2800     // -bootclasspath:
2801     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2802         jio_fprintf(defaultStream::output_stream(),
2803           "-Xbootclasspath is no longer a supported option.\n");
2804         return JNI_EINVAL;
2805     // -bootclasspath/a:
2806     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2807       Arguments::append_sysclasspath(tail);
2808     // -bootclasspath/p:
2809     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2810         jio_fprintf(defaultStream::output_stream(),
2811           "-Xbootclasspath/p is no longer a supported option.\n");
2812         return JNI_EINVAL;
2813     // -Xrun
2814     } else if (match_option(option, "-Xrun", &tail)) {
2815       if (tail != NULL) {
2816         const char* pos = strchr(tail, ':');
2817         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2818         char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2819         jio_snprintf(name, len + 1, "%s", tail);
2820 
2821         char *options = NULL;
2822         if(pos != NULL) {
2823           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2824           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2825         }
2826 #if !INCLUDE_JVMTI
2827         if (strcmp(name, "jdwp") == 0) {
2828           jio_fprintf(defaultStream::error_stream(),
2829             "Debugging agents are not supported in this VM\n");
2830           return JNI_ERR;
2831         }
2832 #endif // !INCLUDE_JVMTI
2833         add_init_library(name, options);
2834       }
2835     } else if (match_option(option, "--add-reads=", &tail)) {
2836       if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2837         return JNI_ENOMEM;
2838       }
2839     } else if (match_option(option, "--add-exports=", &tail)) {
2840       if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2841         return JNI_ENOMEM;
2842       }
2843     } else if (match_option(option, "--add-opens=", &tail)) {
2844       if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2845         return JNI_ENOMEM;
2846       }
2847     } else if (match_option(option, "--add-modules=", &tail)) {
2848       if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2849         return JNI_ENOMEM;
2850       }
2851     } else if (match_option(option, "--limit-modules=", &tail)) {
2852       if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2853         return JNI_ENOMEM;
2854       }
2855     } else if (match_option(option, "--module-path=", &tail)) {
2856       if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2857         return JNI_ENOMEM;
2858       }
2859     } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2860       if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2861         return JNI_ENOMEM;
2862       }
2863     } else if (match_option(option, "--patch-module=", &tail)) {
2864       // --patch-module=<module>=<file>(<pathsep><file>)*
2865       int res = process_patch_mod_option(tail, patch_mod_javabase);
2866       if (res != JNI_OK) {
2867         return res;
2868       }
2869     } else if (match_option(option, "--permit-illegal-access")) {
2870       if (!create_property("jdk.module.permitIllegalAccess", "true", ExternalProperty)) {
2871         return JNI_ENOMEM;
2872       }
2873     // -agentlib and -agentpath
2874     } else if (match_option(option, "-agentlib:", &tail) ||
2875           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2876       if(tail != NULL) {
2877         const char* pos = strchr(tail, '=');
2878         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2879         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len);
2880         name[len] = '\0';
2881 
2882         char *options = NULL;
2883         if(pos != NULL) {
2884           options = os::strdup_check_oom(pos + 1, mtArguments);
2885         }
2886 #if !INCLUDE_JVMTI
2887         if (valid_jdwp_agent(name, is_absolute_path)) {
2888           jio_fprintf(defaultStream::error_stream(),
2889             "Debugging agents are not supported in this VM\n");
2890           return JNI_ERR;
2891         }
2892 #endif // !INCLUDE_JVMTI
2893         add_init_agent(name, options, is_absolute_path);
2894       }
2895     // -javaagent
2896     } else if (match_option(option, "-javaagent:", &tail)) {
2897 #if !INCLUDE_JVMTI
2898       jio_fprintf(defaultStream::error_stream(),
2899         "Instrumentation agents are not supported in this VM\n");
2900       return JNI_ERR;
2901 #else
2902       if (tail != NULL) {
2903         size_t length = strlen(tail) + 1;
2904         char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2905         jio_snprintf(options, length, "%s", tail);
2906         add_init_agent("instrument", options, false);
2907         // java agents need module java.instrument
2908         if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2909           return JNI_ENOMEM;
2910         }
2911       }
2912 #endif // !INCLUDE_JVMTI
2913     // -Xnoclassgc
2914     } else if (match_option(option, "-Xnoclassgc")) {
2915       if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2916         return JNI_EINVAL;
2917       }
2918     // -Xconcgc
2919     } else if (match_option(option, "-Xconcgc")) {
2920       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2921         return JNI_EINVAL;
2922       }
2923       handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2924     // -Xnoconcgc
2925     } else if (match_option(option, "-Xnoconcgc")) {
2926       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2927         return JNI_EINVAL;
2928       }
2929       handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2930     // -Xbatch
2931     } else if (match_option(option, "-Xbatch")) {
2932       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2933         return JNI_EINVAL;
2934       }
2935     // -Xmn for compatibility with other JVM vendors
2936     } else if (match_option(option, "-Xmn", &tail)) {
2937       julong long_initial_young_size = 0;
2938       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2939       if (errcode != arg_in_range) {
2940         jio_fprintf(defaultStream::error_stream(),
2941                     "Invalid initial young generation size: %s\n", option->optionString);
2942         describe_range_error(errcode);
2943         return JNI_EINVAL;
2944       }
2945       if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2946         return JNI_EINVAL;
2947       }
2948       if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2949         return JNI_EINVAL;
2950       }
2951     // -Xms
2952     } else if (match_option(option, "-Xms", &tail)) {
2953       julong long_initial_heap_size = 0;
2954       // an initial heap size of 0 means automatically determine
2955       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2956       if (errcode != arg_in_range) {
2957         jio_fprintf(defaultStream::error_stream(),
2958                     "Invalid initial heap size: %s\n", option->optionString);
2959         describe_range_error(errcode);
2960         return JNI_EINVAL;
2961       }
2962       set_min_heap_size((size_t)long_initial_heap_size);
2963       // Currently the minimum size and the initial heap sizes are the same.
2964       // Can be overridden with -XX:InitialHeapSize.
2965       if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2966         return JNI_EINVAL;
2967       }
2968     // -Xmx
2969     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2970       julong long_max_heap_size = 0;
2971       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2972       if (errcode != arg_in_range) {
2973         jio_fprintf(defaultStream::error_stream(),
2974                     "Invalid maximum heap size: %s\n", option->optionString);
2975         describe_range_error(errcode);
2976         return JNI_EINVAL;
2977       }
2978       if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2979         return JNI_EINVAL;
2980       }
2981     // Xmaxf
2982     } else if (match_option(option, "-Xmaxf", &tail)) {
2983       char* err;
2984       int maxf = (int)(strtod(tail, &err) * 100);
2985       if (*err != '\0' || *tail == '\0') {
2986         jio_fprintf(defaultStream::error_stream(),
2987                     "Bad max heap free percentage size: %s\n",
2988                     option->optionString);
2989         return JNI_EINVAL;
2990       } else {
2991         if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2992             return JNI_EINVAL;
2993         }
2994       }
2995     // Xminf
2996     } else if (match_option(option, "-Xminf", &tail)) {
2997       char* err;
2998       int minf = (int)(strtod(tail, &err) * 100);
2999       if (*err != '\0' || *tail == '\0') {
3000         jio_fprintf(defaultStream::error_stream(),
3001                     "Bad min heap free percentage size: %s\n",
3002                     option->optionString);
3003         return JNI_EINVAL;
3004       } else {
3005         if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
3006           return JNI_EINVAL;
3007         }
3008       }
3009     // -Xss
3010     } else if (match_option(option, "-Xss", &tail)) {
3011       julong long_ThreadStackSize = 0;
3012       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3013       if (errcode != arg_in_range) {
3014         jio_fprintf(defaultStream::error_stream(),
3015                     "Invalid thread stack size: %s\n", option->optionString);
3016         describe_range_error(errcode);
3017         return JNI_EINVAL;
3018       }
3019       // Internally track ThreadStackSize in units of 1024 bytes.
3020       if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
3021                        round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
3022         return JNI_EINVAL;
3023       }
3024     // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
3025     } else if (match_option(option, "-Xoss", &tail) ||
3026                match_option(option, "-Xsqnopause") ||
3027                match_option(option, "-Xoptimize") ||
3028                match_option(option, "-Xboundthreads") ||
3029                match_option(option, "-Xusealtsigs")) {
3030       // All these options are deprecated in JDK 9 and will be removed in a future release
3031       char version[256];
3032       JDK_Version::jdk(9).to_string(version, sizeof(version));
3033       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
3034     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3035       julong long_CodeCacheExpansionSize = 0;
3036       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3037       if (errcode != arg_in_range) {
3038         jio_fprintf(defaultStream::error_stream(),
3039                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3040                    os::vm_page_size()/K);
3041         return JNI_EINVAL;
3042       }
3043       if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
3044         return JNI_EINVAL;
3045       }
3046     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3047                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3048       julong long_ReservedCodeCacheSize = 0;
3049 
3050       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3051       if (errcode != arg_in_range) {
3052         jio_fprintf(defaultStream::error_stream(),
3053                     "Invalid maximum code cache size: %s.\n", option->optionString);
3054         return JNI_EINVAL;
3055       }
3056       if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
3057         return JNI_EINVAL;
3058       }
3059       // -XX:NonNMethodCodeHeapSize=
3060     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3061       julong long_NonNMethodCodeHeapSize = 0;
3062 
3063       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3064       if (errcode != arg_in_range) {
3065         jio_fprintf(defaultStream::error_stream(),
3066                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3067         return JNI_EINVAL;
3068       }
3069       if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
3070         return JNI_EINVAL;
3071       }
3072       // -XX:ProfiledCodeHeapSize=
3073     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3074       julong long_ProfiledCodeHeapSize = 0;
3075 
3076       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3077       if (errcode != arg_in_range) {
3078         jio_fprintf(defaultStream::error_stream(),
3079                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3080         return JNI_EINVAL;
3081       }
3082       if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
3083         return JNI_EINVAL;
3084       }
3085       // -XX:NonProfiledCodeHeapSizee=
3086     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3087       julong long_NonProfiledCodeHeapSize = 0;
3088 
3089       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3090       if (errcode != arg_in_range) {
3091         jio_fprintf(defaultStream::error_stream(),
3092                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3093         return JNI_EINVAL;
3094       }
3095       if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
3096         return JNI_EINVAL;
3097       }
3098     // -green
3099     } else if (match_option(option, "-green")) {
3100       jio_fprintf(defaultStream::error_stream(),
3101                   "Green threads support not available\n");
3102           return JNI_EINVAL;
3103     // -native
3104     } else if (match_option(option, "-native")) {
3105           // HotSpot always uses native threads, ignore silently for compatibility
3106     // -Xrs
3107     } else if (match_option(option, "-Xrs")) {
3108           // Classic/EVM option, new functionality
3109       if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
3110         return JNI_EINVAL;
3111       }
3112     // -Xprof
3113     } else if (match_option(option, "-Xprof")) {
3114 #if INCLUDE_FPROF
3115       log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release.");
3116       _has_profile = true;
3117 #else // INCLUDE_FPROF
3118       jio_fprintf(defaultStream::error_stream(),
3119         "Flat profiling is not supported in this VM.\n");
3120       return JNI_ERR;
3121 #endif // INCLUDE_FPROF
3122     // -Xconcurrentio
3123     } else if (match_option(option, "-Xconcurrentio")) {
3124       if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
3125         return JNI_EINVAL;
3126       }
3127       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
3128         return JNI_EINVAL;
3129       }
3130       if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
3131         return JNI_EINVAL;
3132       }
3133       if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
3134         return JNI_EINVAL;
3135       }
3136       if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) {  // 20Kb per thread added to new generation
3137         return JNI_EINVAL;
3138       }
3139 
3140       // -Xinternalversion
3141     } else if (match_option(option, "-Xinternalversion")) {
3142       jio_fprintf(defaultStream::output_stream(), "%s\n",
3143                   VM_Version::internal_vm_info_string());
3144       vm_exit(0);
3145 #ifndef PRODUCT
3146     // -Xprintflags
3147     } else if (match_option(option, "-Xprintflags")) {
3148       CommandLineFlags::printFlags(tty, false);
3149       vm_exit(0);
3150 #endif
3151     // -D
3152     } else if (match_option(option, "-D", &tail)) {
3153       const char* value;
3154       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3155             *value!= '\0' && strcmp(value, "\"\"") != 0) {
3156         // abort if -Djava.endorsed.dirs is set
3157         jio_fprintf(defaultStream::output_stream(),
3158           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3159           "in modular form will be supported via the concept of upgradeable modules.\n", value);
3160         return JNI_EINVAL;
3161       }
3162       if (match_option(option, "-Djava.ext.dirs=", &value) &&
3163             *value != '\0' && strcmp(value, "\"\"") != 0) {
3164         // abort if -Djava.ext.dirs is set
3165         jio_fprintf(defaultStream::output_stream(),
3166           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
3167         return JNI_EINVAL;
3168       }
3169       // Check for module related properties.  They must be set using the modules
3170       // options. For example: use "--add-modules=java.sql", not
3171       // "-Djdk.module.addmods=java.sql"
3172       if (is_internal_module_property(option->optionString + 2)) {
3173         needs_module_property_warning = true;
3174         continue;
3175       }
3176 
3177       if (!add_property(tail)) {
3178         return JNI_ENOMEM;
3179       }
3180       // Out of the box management support
3181       if (match_option(option, "-Dcom.sun.management", &tail)) {
3182 #if INCLUDE_MANAGEMENT
3183         if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3184           return JNI_EINVAL;
3185         }
3186         // management agent in module jdk.management.agent
3187         if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
3188           return JNI_ENOMEM;
3189         }
3190 #else
3191         jio_fprintf(defaultStream::output_stream(),
3192           "-Dcom.sun.management is not supported in this VM.\n");
3193         return JNI_ERR;
3194 #endif
3195       }
3196     // -Xint
3197     } else if (match_option(option, "-Xint")) {
3198           set_mode_flags(_int);
3199     // -Xmixed
3200     } else if (match_option(option, "-Xmixed")) {
3201           set_mode_flags(_mixed);
3202     // -Xcomp
3203     } else if (match_option(option, "-Xcomp")) {
3204       // for testing the compiler; turn off all flags that inhibit compilation
3205           set_mode_flags(_comp);
3206     // -Xshare:dump
3207     } else if (match_option(option, "-Xshare:dump")) {
3208       if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3209         return JNI_EINVAL;
3210       }
3211       set_mode_flags(_int);     // Prevent compilation, which creates objects
3212     // -Xshare:on
3213     } else if (match_option(option, "-Xshare:on")) {
3214       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3215         return JNI_EINVAL;
3216       }
3217       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3218         return JNI_EINVAL;
3219       }
3220     // -Xshare:auto
3221     } else if (match_option(option, "-Xshare:auto")) {
3222       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3223         return JNI_EINVAL;
3224       }
3225       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3226         return JNI_EINVAL;
3227       }
3228     // -Xshare:off
3229     } else if (match_option(option, "-Xshare:off")) {
3230       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3231         return JNI_EINVAL;
3232       }
3233       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3234         return JNI_EINVAL;
3235       }
3236     // -Xverify
3237     } else if (match_option(option, "-Xverify", &tail)) {
3238       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3239         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3240           return JNI_EINVAL;
3241         }
3242         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3243           return JNI_EINVAL;
3244         }
3245       } else if (strcmp(tail, ":remote") == 0) {
3246         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3247           return JNI_EINVAL;
3248         }
3249         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3250           return JNI_EINVAL;
3251         }
3252       } else if (strcmp(tail, ":none") == 0) {
3253         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3254           return JNI_EINVAL;
3255         }
3256         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3257           return JNI_EINVAL;
3258         }
3259       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3260         return JNI_EINVAL;
3261       }
3262     // -Xdebug
3263     } else if (match_option(option, "-Xdebug")) {
3264       // note this flag has been used, then ignore
3265       set_xdebug_mode(true);
3266     // -Xnoagent
3267     } else if (match_option(option, "-Xnoagent")) {
3268       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3269     } else if (match_option(option, "-Xloggc:", &tail)) {
3270       // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3271       log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3272       _gc_log_filename = os::strdup_check_oom(tail);
3273     } else if (match_option(option, "-Xlog", &tail)) {
3274       bool ret = false;
3275       if (strcmp(tail, ":help") == 0) {
3276         LogConfiguration::print_command_line_help(defaultStream::output_stream());
3277         vm_exit(0);
3278       } else if (strcmp(tail, ":disable") == 0) {
3279         LogConfiguration::disable_logging();
3280         ret = true;
3281       } else if (*tail == '\0') {
3282         ret = LogConfiguration::parse_command_line_arguments();
3283         assert(ret, "-Xlog without arguments should never fail to parse");
3284       } else if (*tail == ':') {
3285         ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3286       }
3287       if (ret == false) {
3288         jio_fprintf(defaultStream::error_stream(),
3289                     "Invalid -Xlog option '-Xlog%s'\n",
3290                     tail);
3291         return JNI_EINVAL;
3292       }
3293     // JNI hooks
3294     } else if (match_option(option, "-Xcheck", &tail)) {
3295       if (!strcmp(tail, ":jni")) {
3296 #if !INCLUDE_JNI_CHECK
3297         warning("JNI CHECKING is not supported in this VM");
3298 #else
3299         CheckJNICalls = true;
3300 #endif // INCLUDE_JNI_CHECK
3301       } else if (is_bad_option(option, args->ignoreUnrecognized,
3302                                      "check")) {
3303         return JNI_EINVAL;
3304       }
3305     } else if (match_option(option, "vfprintf")) {
3306       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3307     } else if (match_option(option, "exit")) {
3308       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3309     } else if (match_option(option, "abort")) {
3310       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3311     // -XX:+AggressiveHeap
3312     } else if (match_option(option, "-XX:+AggressiveHeap")) {
3313       jint result = set_aggressive_heap_flags();
3314       if (result != JNI_OK) {
3315           return result;
3316       }
3317     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3318     // and the last option wins.
3319     } else if (match_option(option, "-XX:+NeverTenure")) {
3320       if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3321         return JNI_EINVAL;
3322       }
3323       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3324         return JNI_EINVAL;
3325       }
3326       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3327         return JNI_EINVAL;
3328       }
3329     } else if (match_option(option, "-XX:+AlwaysTenure")) {
3330       if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3331         return JNI_EINVAL;
3332       }
3333       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3334         return JNI_EINVAL;
3335       }
3336       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3337         return JNI_EINVAL;
3338       }
3339     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3340       uintx max_tenuring_thresh = 0;
3341       if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3342         jio_fprintf(defaultStream::error_stream(),
3343                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3344         return JNI_EINVAL;
3345       }
3346 
3347       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3348         return JNI_EINVAL;
3349       }
3350 
3351       if (MaxTenuringThreshold == 0) {
3352         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3353           return JNI_EINVAL;
3354         }
3355         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3356           return JNI_EINVAL;
3357         }
3358       } else {
3359         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3360           return JNI_EINVAL;
3361         }
3362         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3363           return JNI_EINVAL;
3364         }
3365       }
3366     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3367       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3368         return JNI_EINVAL;
3369       }
3370       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3371         return JNI_EINVAL;
3372       }
3373     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3374       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3375         return JNI_EINVAL;
3376       }
3377       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3378         return JNI_EINVAL;
3379       }
3380     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3381 #if defined(DTRACE_ENABLED)
3382       if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3383         return JNI_EINVAL;
3384       }
3385       if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3386         return JNI_EINVAL;
3387       }
3388       if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3389         return JNI_EINVAL;
3390       }
3391       if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3392         return JNI_EINVAL;
3393       }
3394 #else // defined(DTRACE_ENABLED)
3395       jio_fprintf(defaultStream::error_stream(),
3396                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3397       return JNI_EINVAL;
3398 #endif // defined(DTRACE_ENABLED)
3399 #ifdef ASSERT
3400     } else if (match_option(option, "-XX:+FullGCALot")) {
3401       if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3402         return JNI_EINVAL;
3403       }
3404       // disable scavenge before parallel mark-compact
3405       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3406         return JNI_EINVAL;
3407       }
3408 #endif
3409 #if !INCLUDE_MANAGEMENT
3410     } else if (match_option(option, "-XX:+ManagementServer")) {
3411         jio_fprintf(defaultStream::error_stream(),
3412           "ManagementServer is not supported in this VM.\n");
3413         return JNI_ERR;
3414 #endif // INCLUDE_MANAGEMENT
3415     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3416       // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3417       // already been handled
3418       if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3419           (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3420         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3421           return JNI_EINVAL;
3422         }
3423       }
3424     // Unknown option
3425     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3426       return JNI_ERR;
3427     }
3428   }
3429 
3430   // PrintSharedArchiveAndExit will turn on
3431   //   -Xshare:on
3432   //   -Xlog:class+path=info
3433   if (PrintSharedArchiveAndExit) {
3434     if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3435       return JNI_EINVAL;
3436     }
3437     if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3438       return JNI_EINVAL;
3439     }
3440     LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3441   }
3442 
3443   // Change the default value for flags  which have different default values
3444   // when working with older JDKs.
3445 #ifdef LINUX
3446  if (JDK_Version::current().compare_major(6) <= 0 &&
3447       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3448     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3449   }
3450 #endif // LINUX
3451   fix_appclasspath();
3452   return JNI_OK;
3453 }
3454 
3455 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3456   // For java.base check for duplicate --patch-module options being specified on the command line.
3457   // This check is only required for java.base, all other duplicate module specifications
3458   // will be checked during module system initialization.  The module system initialization
3459   // will throw an ExceptionInInitializerError if this situation occurs.
3460   if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3461     if (*patch_mod_javabase) {
3462       vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3463     } else {
3464       *patch_mod_javabase = true;
3465     }
3466   }
3467 
3468   // Create GrowableArray lazily, only if --patch-module has been specified
3469   if (_patch_mod_prefix == NULL) {
3470     _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3471   }
3472 
3473   _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3474 }
3475 
3476 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3477 //
3478 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3479 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3480 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3481 // path is treated as the current directory.
3482 //
3483 // This causes problems with CDS, which requires that all directories specified in the classpath
3484 // must be empty. In most cases, applications do NOT want to load classes from the current
3485 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3486 // scripts compatible with CDS.
3487 void Arguments::fix_appclasspath() {
3488   if (IgnoreEmptyClassPaths) {
3489     const char separator = *os::path_separator();
3490     const char* src = _java_class_path->value();
3491 
3492     // skip over all the leading empty paths
3493     while (*src == separator) {
3494       src ++;
3495     }
3496 
3497     char* copy = os::strdup_check_oom(src, mtArguments);
3498 
3499     // trim all trailing empty paths
3500     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3501       *tail = '\0';
3502     }
3503 
3504     char from[3] = {separator, separator, '\0'};
3505     char to  [2] = {separator, '\0'};
3506     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3507       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3508       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3509     }
3510 
3511     _java_class_path->set_writeable_value(copy);
3512     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3513   }
3514 }
3515 
3516 static bool has_jar_files(const char* directory) {
3517   DIR* dir = os::opendir(directory);
3518   if (dir == NULL) return false;
3519 
3520   struct dirent *entry;
3521   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments);
3522   bool hasJarFile = false;
3523   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3524     const char* name = entry->d_name;
3525     const char* ext = name + strlen(name) - 4;
3526     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3527   }
3528   FREE_C_HEAP_ARRAY(char, dbuf);
3529   os::closedir(dir);
3530   return hasJarFile ;
3531 }
3532 
3533 static int check_non_empty_dirs(const char* path) {
3534   const char separator = *os::path_separator();
3535   const char* const end = path + strlen(path);
3536   int nonEmptyDirs = 0;
3537   while (path < end) {
3538     const char* tmp_end = strchr(path, separator);
3539     if (tmp_end == NULL) {
3540       if (has_jar_files(path)) {
3541         nonEmptyDirs++;
3542         jio_fprintf(defaultStream::output_stream(),
3543           "Non-empty directory: %s\n", path);
3544       }
3545       path = end;
3546     } else {
3547       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments);
3548       memcpy(dirpath, path, tmp_end - path);
3549       dirpath[tmp_end - path] = '\0';
3550       if (has_jar_files(dirpath)) {
3551         nonEmptyDirs++;
3552         jio_fprintf(defaultStream::output_stream(),
3553           "Non-empty directory: %s\n", dirpath);
3554       }
3555       FREE_C_HEAP_ARRAY(char, dirpath);
3556       path = tmp_end + 1;
3557     }
3558   }
3559   return nonEmptyDirs;
3560 }
3561 
3562 jint Arguments::finalize_vm_init_args() {
3563   // check if the default lib/endorsed directory exists; if so, error
3564   char path[JVM_MAXPATHLEN];
3565   const char* fileSep = os::file_separator();
3566   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3567 
3568   if (CheckEndorsedAndExtDirs) {
3569     int nonEmptyDirs = 0;
3570     // check endorsed directory
3571     nonEmptyDirs += check_non_empty_dirs(path);
3572     // check the extension directories
3573     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3574     if (nonEmptyDirs > 0) {
3575       return JNI_ERR;
3576     }
3577   }
3578 
3579   DIR* dir = os::opendir(path);
3580   if (dir != NULL) {
3581     jio_fprintf(defaultStream::output_stream(),
3582       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3583       "in modular form will be supported via the concept of upgradeable modules.\n");
3584     os::closedir(dir);
3585     return JNI_ERR;
3586   }
3587 
3588   jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3589   dir = os::opendir(path);
3590   if (dir != NULL) {
3591     jio_fprintf(defaultStream::output_stream(),
3592       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3593       "Use -classpath instead.\n.");
3594     os::closedir(dir);
3595     return JNI_ERR;
3596   }
3597 
3598   // This must be done after all arguments have been processed.
3599   // java_compiler() true means set to "NONE" or empty.
3600   if (java_compiler() && !xdebug_mode()) {
3601     // For backwards compatibility, we switch to interpreted mode if
3602     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3603     // not specified.
3604     set_mode_flags(_int);
3605   }
3606 
3607   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3608   // but like -Xint, leave compilation thresholds unaffected.
3609   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3610   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3611     set_mode_flags(_int);
3612   }
3613 
3614   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3615   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3616     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3617   }
3618 
3619 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3620   // Don't degrade server performance for footprint
3621   if (FLAG_IS_DEFAULT(UseLargePages) &&
3622       MaxHeapSize < LargePageHeapSizeThreshold) {
3623     // No need for large granularity pages w/small heaps.
3624     // Note that large pages are enabled/disabled for both the
3625     // Java heap and the code cache.
3626     FLAG_SET_DEFAULT(UseLargePages, false);
3627   }
3628 
3629 #elif defined(COMPILER2)
3630   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3631     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3632   }
3633 #endif
3634 
3635 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3636   UNSUPPORTED_OPTION(ProfileInterpreter);
3637   NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3638 #endif
3639 
3640 #ifndef TIERED
3641   // Tiered compilation is undefined.
3642   UNSUPPORTED_OPTION(TieredCompilation);
3643 #endif
3644 
3645 #if INCLUDE_JVMCI
3646   if (EnableJVMCI &&
3647       !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
3648     return JNI_ENOMEM;
3649   }
3650 #endif
3651 
3652   // If we are running in a headless jre, force java.awt.headless property
3653   // to be true unless the property has already been set.
3654   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3655   if (os::is_headless_jre()) {
3656     const char* headless = Arguments::get_property("java.awt.headless");
3657     if (headless == NULL) {
3658       const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3659       if (headless_env == NULL) {
3660         if (!add_property("java.awt.headless=true")) {
3661           return JNI_ENOMEM;
3662         }
3663       } else {
3664         char buffer[256];
3665         jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3666         if (!add_property(buffer)) {
3667           return JNI_ENOMEM;
3668         }
3669       }
3670     }
3671   }
3672 
3673   if (!check_vm_args_consistency()) {
3674     return JNI_ERR;
3675   }
3676 
3677 #if INCLUDE_JVMCI
3678   if (UseJVMCICompiler) {
3679     Compilation_mode = CompMode_server;
3680   }
3681 #endif
3682 
3683   return JNI_OK;
3684 }
3685 
3686 // Helper class for controlling the lifetime of JavaVMInitArgs
3687 // objects.  The contents of the JavaVMInitArgs are guaranteed to be
3688 // deleted on the destruction of the ScopedVMInitArgs object.
3689 class ScopedVMInitArgs : public StackObj {
3690  private:
3691   JavaVMInitArgs _args;
3692   char*          _container_name;
3693   bool           _is_set;
3694   char*          _vm_options_file_arg;
3695 
3696  public:
3697   ScopedVMInitArgs(const char *container_name) {
3698     _args.version = JNI_VERSION_1_2;
3699     _args.nOptions = 0;
3700     _args.options = NULL;
3701     _args.ignoreUnrecognized = false;
3702     _container_name = (char *)container_name;
3703     _is_set = false;
3704     _vm_options_file_arg = NULL;
3705   }
3706 
3707   // Populates the JavaVMInitArgs object represented by this
3708   // ScopedVMInitArgs object with the arguments in options.  The
3709   // allocated memory is deleted by the destructor.  If this method
3710   // returns anything other than JNI_OK, then this object is in a
3711   // partially constructed state, and should be abandoned.
3712   jint set_args(GrowableArray<JavaVMOption>* options) {
3713     _is_set = true;
3714     JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3715         JavaVMOption, options->length(), mtArguments);
3716     if (options_arr == NULL) {
3717       return JNI_ENOMEM;
3718     }
3719     _args.options = options_arr;
3720 
3721     for (int i = 0; i < options->length(); i++) {
3722       options_arr[i] = options->at(i);
3723       options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3724       if (options_arr[i].optionString == NULL) {
3725         // Rely on the destructor to do cleanup.
3726         _args.nOptions = i;
3727         return JNI_ENOMEM;
3728       }
3729     }
3730 
3731     _args.nOptions = options->length();
3732     _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3733     return JNI_OK;
3734   }
3735 
3736   JavaVMInitArgs* get()             { return &_args; }
3737   char* container_name()            { return _container_name; }
3738   bool  is_set()                    { return _is_set; }
3739   bool  found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3740   char* vm_options_file_arg()       { return _vm_options_file_arg; }
3741 
3742   void set_vm_options_file_arg(const char *vm_options_file_arg) {
3743     if (_vm_options_file_arg != NULL) {
3744       os::free(_vm_options_file_arg);
3745     }
3746     _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3747   }
3748 
3749   ~ScopedVMInitArgs() {
3750     if (_vm_options_file_arg != NULL) {
3751       os::free(_vm_options_file_arg);
3752     }
3753     if (_args.options == NULL) return;
3754     for (int i = 0; i < _args.nOptions; i++) {
3755       os::free(_args.options[i].optionString);
3756     }
3757     FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3758   }
3759 
3760   // Insert options into this option list, to replace option at
3761   // vm_options_file_pos (-XX:VMOptionsFile)
3762   jint insert(const JavaVMInitArgs* args,
3763               const JavaVMInitArgs* args_to_insert,
3764               const int vm_options_file_pos) {
3765     assert(_args.options == NULL, "shouldn't be set yet");
3766     assert(args_to_insert->nOptions != 0, "there should be args to insert");
3767     assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3768 
3769     int length = args->nOptions + args_to_insert->nOptions - 1;
3770     GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3771               GrowableArray<JavaVMOption>(length, true);    // Construct new option array
3772     for (int i = 0; i < args->nOptions; i++) {
3773       if (i == vm_options_file_pos) {
3774         // insert the new options starting at the same place as the
3775         // -XX:VMOptionsFile option
3776         for (int j = 0; j < args_to_insert->nOptions; j++) {
3777           options->push(args_to_insert->options[j]);
3778         }
3779       } else {
3780         options->push(args->options[i]);
3781       }
3782     }
3783     // make into options array
3784     jint result = set_args(options);
3785     delete options;
3786     return result;
3787   }
3788 };
3789 
3790 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3791   return parse_options_environment_variable("_JAVA_OPTIONS", args);
3792 }
3793 
3794 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3795   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3796 }
3797 
3798 jint Arguments::parse_options_environment_variable(const char* name,
3799                                                    ScopedVMInitArgs* vm_args) {
3800   char *buffer = ::getenv(name);
3801 
3802   // Don't check this environment variable if user has special privileges
3803   // (e.g. unix su command).
3804   if (buffer == NULL || os::have_special_privileges()) {
3805     return JNI_OK;
3806   }
3807 
3808   if ((buffer = os::strdup(buffer)) == NULL) {
3809     return JNI_ENOMEM;
3810   }
3811 
3812   jio_fprintf(defaultStream::error_stream(),
3813               "Picked up %s: %s\n", name, buffer);
3814 
3815   int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3816 
3817   os::free(buffer);
3818   return retcode;
3819 }
3820 
3821 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3822   // read file into buffer
3823   int fd = ::open(file_name, O_RDONLY);
3824   if (fd < 0) {
3825     jio_fprintf(defaultStream::error_stream(),
3826                 "Could not open options file '%s'\n",
3827                 file_name);
3828     return JNI_ERR;
3829   }
3830 
3831   struct stat stbuf;
3832   int retcode = os::stat(file_name, &stbuf);
3833   if (retcode != 0) {
3834     jio_fprintf(defaultStream::error_stream(),
3835                 "Could not stat options file '%s'\n",
3836                 file_name);
3837     os::close(fd);
3838     return JNI_ERR;
3839   }
3840 
3841   if (stbuf.st_size == 0) {
3842     // tell caller there is no option data and that is ok
3843     os::close(fd);
3844     return JNI_OK;
3845   }
3846 
3847   // '+ 1' for NULL termination even with max bytes
3848   size_t bytes_alloc = stbuf.st_size + 1;
3849 
3850   char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3851   if (NULL == buf) {
3852     jio_fprintf(defaultStream::error_stream(),
3853                 "Could not allocate read buffer for options file parse\n");
3854     os::close(fd);
3855     return JNI_ENOMEM;
3856   }
3857 
3858   memset(buf, 0, bytes_alloc);
3859 
3860   // Fill buffer
3861   // Use ::read() instead of os::read because os::read()
3862   // might do a thread state transition
3863   // and it is too early for that here
3864 
3865   ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3866   os::close(fd);
3867   if (bytes_read < 0) {
3868     FREE_C_HEAP_ARRAY(char, buf);
3869     jio_fprintf(defaultStream::error_stream(),
3870                 "Could not read options file '%s'\n", file_name);
3871     return JNI_ERR;
3872   }
3873 
3874   if (bytes_read == 0) {
3875     // tell caller there is no option data and that is ok
3876     FREE_C_HEAP_ARRAY(char, buf);
3877     return JNI_OK;
3878   }
3879 
3880   retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3881 
3882   FREE_C_HEAP_ARRAY(char, buf);
3883   return retcode;
3884 }
3885 
3886 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3887   GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true);    // Construct option array
3888 
3889   // some pointers to help with parsing
3890   char *buffer_end = buffer + buf_len;
3891   char *opt_hd = buffer;
3892   char *wrt = buffer;
3893   char *rd = buffer;
3894 
3895   // parse all options
3896   while (rd < buffer_end) {
3897     // skip leading white space from the input string
3898     while (rd < buffer_end && isspace(*rd)) {
3899       rd++;
3900     }
3901 
3902     if (rd >= buffer_end) {
3903       break;
3904     }
3905 
3906     // Remember this is where we found the head of the token.
3907     opt_hd = wrt;
3908 
3909     // Tokens are strings of non white space characters separated
3910     // by one or more white spaces.
3911     while (rd < buffer_end && !isspace(*rd)) {
3912       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3913         int quote = *rd;                    // matching quote to look for
3914         rd++;                               // don't copy open quote
3915         while (rd < buffer_end && *rd != quote) {
3916                                             // include everything (even spaces)
3917                                             // up until the close quote
3918           *wrt++ = *rd++;                   // copy to option string
3919         }
3920 
3921         if (rd < buffer_end) {
3922           rd++;                             // don't copy close quote
3923         } else {
3924                                             // did not see closing quote
3925           jio_fprintf(defaultStream::error_stream(),
3926                       "Unmatched quote in %s\n", name);
3927           delete options;
3928           return JNI_ERR;
3929         }
3930       } else {
3931         *wrt++ = *rd++;                     // copy to option string
3932       }
3933     }
3934 
3935     // steal a white space character and set it to NULL
3936     *wrt++ = '\0';
3937     // We now have a complete token
3938 
3939     JavaVMOption option;
3940     option.optionString = opt_hd;
3941     option.extraInfo = NULL;
3942 
3943     options->append(option);                // Fill in option
3944 
3945     rd++;  // Advance to next character
3946   }
3947 
3948   // Fill out JavaVMInitArgs structure.
3949   jint status = vm_args->set_args(options);
3950 
3951   delete options;
3952   return status;
3953 }
3954 
3955 void Arguments::set_shared_spaces_flags() {
3956   if (DumpSharedSpaces) {
3957     if (FailOverToOldVerifier) {
3958       // Don't fall back to the old verifier on verification failure. If a
3959       // class fails verification with the split verifier, it might fail the
3960       // CDS runtime verifier constraint check. In that case, we don't want
3961       // to share the class. We only archive classes that pass the split verifier.
3962       FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3963     }
3964 
3965     if (RequireSharedSpaces) {
3966       warning("Cannot dump shared archive while using shared archive");
3967     }
3968     UseSharedSpaces = false;
3969 #ifdef _LP64
3970     if (!UseCompressedOops || !UseCompressedClassPointers) {
3971       vm_exit_during_initialization(
3972         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3973     }
3974   } else {
3975     if (!UseCompressedOops || !UseCompressedClassPointers) {
3976       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3977     }
3978 #endif
3979   }
3980 }
3981 
3982 // Sharing support
3983 // Construct the path to the archive
3984 static char* get_shared_archive_path() {
3985   char *shared_archive_path;
3986   if (SharedArchiveFile == NULL) {
3987     char jvm_path[JVM_MAXPATHLEN];
3988     os::jvm_path(jvm_path, sizeof(jvm_path));
3989     char *end = strrchr(jvm_path, *os::file_separator());
3990     if (end != NULL) *end = '\0';
3991     size_t jvm_path_len = strlen(jvm_path);
3992     size_t file_sep_len = strlen(os::file_separator());
3993     const size_t len = jvm_path_len + file_sep_len + 20;
3994     shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3995     if (shared_archive_path != NULL) {
3996       jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3997         jvm_path, os::file_separator());
3998     }
3999   } else {
4000     shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
4001   }
4002   return shared_archive_path;
4003 }
4004 
4005 #ifndef PRODUCT
4006 // Determine whether LogVMOutput should be implicitly turned on.
4007 static bool use_vm_log() {
4008   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4009       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4010       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4011       PrintAssembly || TraceDeoptimization || TraceDependencies ||
4012       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4013     return true;
4014   }
4015 
4016 #ifdef COMPILER1
4017   if (PrintC1Statistics) {
4018     return true;
4019   }
4020 #endif // COMPILER1
4021 
4022 #ifdef COMPILER2
4023   if (PrintOptoAssembly || PrintOptoStatistics) {
4024     return true;
4025   }
4026 #endif // COMPILER2
4027 
4028   return false;
4029 }
4030 
4031 #endif // PRODUCT
4032 
4033 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
4034   for (int index = 0; index < args->nOptions; index++) {
4035     const JavaVMOption* option = args->options + index;
4036     const char* tail;
4037     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4038       return true;
4039     }
4040   }
4041   return false;
4042 }
4043 
4044 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
4045                                        const char* vm_options_file,
4046                                        const int vm_options_file_pos,
4047                                        ScopedVMInitArgs* vm_options_file_args,
4048                                        ScopedVMInitArgs* args_out) {
4049   jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
4050   if (code != JNI_OK) {
4051     return code;
4052   }
4053 
4054   if (vm_options_file_args->get()->nOptions < 1) {
4055     return JNI_OK;
4056   }
4057 
4058   if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
4059     jio_fprintf(defaultStream::error_stream(),
4060                 "A VM options file may not refer to a VM options file. "
4061                 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
4062                 "options file '%s' in options container '%s' is an error.\n",
4063                 vm_options_file_args->vm_options_file_arg(),
4064                 vm_options_file_args->container_name());
4065     return JNI_EINVAL;
4066   }
4067 
4068   return args_out->insert(args, vm_options_file_args->get(),
4069                           vm_options_file_pos);
4070 }
4071 
4072 // Expand -XX:VMOptionsFile found in args_in as needed.
4073 // mod_args and args_out parameters may return values as needed.
4074 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
4075                                             ScopedVMInitArgs* mod_args,
4076                                             JavaVMInitArgs** args_out) {
4077   jint code = match_special_option_and_act(args_in, mod_args);
4078   if (code != JNI_OK) {
4079     return code;
4080   }
4081 
4082   if (mod_args->is_set()) {
4083     // args_in contains -XX:VMOptionsFile and mod_args contains the
4084     // original options from args_in along with the options expanded
4085     // from the VMOptionsFile. Return a short-hand to the caller.
4086     *args_out = mod_args->get();
4087   } else {
4088     *args_out = (JavaVMInitArgs *)args_in;  // no changes so use args_in
4089   }
4090   return JNI_OK;
4091 }
4092 
4093 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
4094                                              ScopedVMInitArgs* args_out) {
4095   // Remaining part of option string
4096   const char* tail;
4097   ScopedVMInitArgs vm_options_file_args(args_out->container_name());
4098 
4099   for (int index = 0; index < args->nOptions; index++) {
4100     const JavaVMOption* option = args->options + index;
4101     if (ArgumentsExt::process_options(option)) {
4102       continue;
4103     }
4104     if (match_option(option, "-XX:Flags=", &tail)) {
4105       Arguments::set_jvm_flags_file(tail);
4106       continue;
4107     }
4108     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4109       if (vm_options_file_args.found_vm_options_file_arg()) {
4110         jio_fprintf(defaultStream::error_stream(),
4111                     "The option '%s' is already specified in the options "
4112                     "container '%s' so the specification of '%s' in the "
4113                     "same options container is an error.\n",
4114                     vm_options_file_args.vm_options_file_arg(),
4115                     vm_options_file_args.container_name(),
4116                     option->optionString);
4117         return JNI_EINVAL;
4118       }
4119       vm_options_file_args.set_vm_options_file_arg(option->optionString);
4120       // If there's a VMOptionsFile, parse that
4121       jint code = insert_vm_options_file(args, tail, index,
4122                                          &vm_options_file_args, args_out);
4123       if (code != JNI_OK) {
4124         return code;
4125       }
4126       args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
4127       if (args_out->is_set()) {
4128         // The VMOptions file inserted some options so switch 'args'
4129         // to the new set of options, and continue processing which
4130         // preserves "last option wins" semantics.
4131         args = args_out->get();
4132         // The first option from the VMOptionsFile replaces the
4133         // current option.  So we back track to process the
4134         // replacement option.
4135         index--;
4136       }
4137       continue;
4138     }
4139     if (match_option(option, "-XX:+PrintVMOptions")) {
4140       PrintVMOptions = true;
4141       continue;
4142     }
4143     if (match_option(option, "-XX:-PrintVMOptions")) {
4144       PrintVMOptions = false;
4145       continue;
4146     }
4147     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4148       IgnoreUnrecognizedVMOptions = true;
4149       continue;
4150     }
4151     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4152       IgnoreUnrecognizedVMOptions = false;
4153       continue;
4154     }
4155     if (match_option(option, "-XX:+PrintFlagsInitial")) {
4156       CommandLineFlags::printFlags(tty, false);
4157       vm_exit(0);
4158     }
4159     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4160 #if INCLUDE_NMT
4161       // The launcher did not setup nmt environment variable properly.
4162       if (!MemTracker::check_launcher_nmt_support(tail)) {
4163         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4164       }
4165 
4166       // Verify if nmt option is valid.
4167       if (MemTracker::verify_nmt_option()) {
4168         // Late initialization, still in single-threaded mode.
4169         if (MemTracker::tracking_level() >= NMT_summary) {
4170           MemTracker::init();
4171         }
4172       } else {
4173         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4174       }
4175       continue;
4176 #else
4177       jio_fprintf(defaultStream::error_stream(),
4178         "Native Memory Tracking is not supported in this VM\n");
4179       return JNI_ERR;
4180 #endif
4181     }
4182 
4183 #ifndef PRODUCT
4184     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4185       CommandLineFlags::printFlags(tty, true);
4186       vm_exit(0);
4187     }
4188 #endif
4189   }
4190   return JNI_OK;
4191 }
4192 
4193 static void print_options(const JavaVMInitArgs *args) {
4194   const char* tail;
4195   for (int index = 0; index < args->nOptions; index++) {
4196     const JavaVMOption *option = args->options + index;
4197     if (match_option(option, "-XX:", &tail)) {
4198       logOption(tail);
4199     }
4200   }
4201 }
4202 
4203 bool Arguments::handle_deprecated_print_gc_flags() {
4204   if (PrintGC) {
4205     log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4206   }
4207   if (PrintGCDetails) {
4208     log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4209   }
4210 
4211   if (_gc_log_filename != NULL) {
4212     // -Xloggc was used to specify a filename
4213     const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4214 
4215     LogTarget(Error, logging) target;
4216     LogStreamCHeap errstream(target);
4217     return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
4218   } else if (PrintGC || PrintGCDetails) {
4219     LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4220   }
4221   return true;
4222 }
4223 
4224 void Arguments::handle_extra_cms_flags(const char* msg) {
4225   SpecialFlag flag;
4226   const char *flag_name = "UseConcMarkSweepGC";
4227   if (lookup_special_flag(flag_name, flag)) {
4228     handle_aliases_and_deprecation(flag_name, /* print warning */ true);
4229     warning("%s", msg);
4230   }
4231 }
4232 
4233 // Parse entry point called from JNI_CreateJavaVM
4234 
4235 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4236   assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4237 
4238   // Initialize ranges, constraints and writeables
4239   CommandLineFlagRangeList::init();
4240   CommandLineFlagConstraintList::init();
4241   CommandLineFlagWriteableList::init();
4242 
4243   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4244   const char* hotspotrc = ".hotspotrc";
4245   bool settings_file_specified = false;
4246   bool needs_hotspotrc_warning = false;
4247   ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4248   ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4249 
4250   // Pointers to current working set of containers
4251   JavaVMInitArgs* cur_cmd_args;
4252   JavaVMInitArgs* cur_java_options_args;
4253   JavaVMInitArgs* cur_java_tool_options_args;
4254 
4255   // Containers for modified/expanded options
4256   ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4257   ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4258   ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4259 
4260 
4261   jint code =
4262       parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4263   if (code != JNI_OK) {
4264     return code;
4265   }
4266 
4267   code = parse_java_options_environment_variable(&initial_java_options_args);
4268   if (code != JNI_OK) {
4269     return code;
4270   }
4271 
4272   code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4273                                      &mod_java_tool_options_args,
4274                                      &cur_java_tool_options_args);
4275   if (code != JNI_OK) {
4276     return code;
4277   }
4278 
4279   code = expand_vm_options_as_needed(initial_cmd_args,
4280                                      &mod_cmd_args,
4281                                      &cur_cmd_args);
4282   if (code != JNI_OK) {
4283     return code;
4284   }
4285 
4286   code = expand_vm_options_as_needed(initial_java_options_args.get(),
4287                                      &mod_java_options_args,
4288                                      &cur_java_options_args);
4289   if (code != JNI_OK) {
4290     return code;
4291   }
4292 
4293   const char* flags_file = Arguments::get_jvm_flags_file();
4294   settings_file_specified = (flags_file != NULL);
4295 
4296   if (IgnoreUnrecognizedVMOptions) {
4297     cur_cmd_args->ignoreUnrecognized = true;
4298     cur_java_tool_options_args->ignoreUnrecognized = true;
4299     cur_java_options_args->ignoreUnrecognized = true;
4300   }
4301 
4302   // Parse specified settings file
4303   if (settings_file_specified) {
4304     if (!process_settings_file(flags_file, true,
4305                                cur_cmd_args->ignoreUnrecognized)) {
4306       return JNI_EINVAL;
4307     }
4308   } else {
4309 #ifdef ASSERT
4310     // Parse default .hotspotrc settings file
4311     if (!process_settings_file(".hotspotrc", false,
4312                                cur_cmd_args->ignoreUnrecognized)) {
4313       return JNI_EINVAL;
4314     }
4315 #else
4316     struct stat buf;
4317     if (os::stat(hotspotrc, &buf) == 0) {
4318       needs_hotspotrc_warning = true;
4319     }
4320 #endif
4321   }
4322 
4323   if (PrintVMOptions) {
4324     print_options(cur_java_tool_options_args);
4325     print_options(cur_cmd_args);
4326     print_options(cur_java_options_args);
4327   }
4328 
4329   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4330   jint result = parse_vm_init_args(cur_java_tool_options_args,
4331                                    cur_java_options_args,
4332                                    cur_cmd_args);
4333 
4334   if (result != JNI_OK) {
4335     return result;
4336   }
4337 
4338   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4339   SharedArchivePath = get_shared_archive_path();
4340   if (SharedArchivePath == NULL) {
4341     return JNI_ENOMEM;
4342   }
4343 
4344   // Set up VerifySharedSpaces
4345   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4346     VerifySharedSpaces = true;
4347   }
4348 
4349   // Delay warning until here so that we've had a chance to process
4350   // the -XX:-PrintWarnings flag
4351   if (needs_hotspotrc_warning) {
4352     warning("%s file is present but has been ignored.  "
4353             "Run with -XX:Flags=%s to load the file.",
4354             hotspotrc, hotspotrc);
4355   }
4356 
4357   if (needs_module_property_warning) {
4358     warning("Ignoring system property options whose names match the '-Djdk.module.*'."
4359             " names that are reserved for internal use.");
4360   }
4361 
4362 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
4363   UNSUPPORTED_OPTION(UseLargePages);
4364 #endif
4365 
4366   ArgumentsExt::report_unsupported_options();
4367 
4368 #ifndef PRODUCT
4369   if (TraceBytecodesAt != 0) {
4370     TraceBytecodes = true;
4371   }
4372   if (CountCompiledCalls) {
4373     if (UseCounterDecay) {
4374       warning("UseCounterDecay disabled because CountCalls is set");
4375       UseCounterDecay = false;
4376     }
4377   }
4378 #endif // PRODUCT
4379 
4380   if (ScavengeRootsInCode == 0) {
4381     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4382       warning("Forcing ScavengeRootsInCode non-zero");
4383     }
4384     ScavengeRootsInCode = 1;
4385   }
4386 
4387   if (!handle_deprecated_print_gc_flags()) {
4388     return JNI_EINVAL;
4389   }
4390 
4391   // Set object alignment values.
4392   set_object_alignment();
4393 
4394 #if !INCLUDE_CDS
4395   if (DumpSharedSpaces || RequireSharedSpaces) {
4396     jio_fprintf(defaultStream::error_stream(),
4397       "Shared spaces are not supported in this VM\n");
4398     return JNI_ERR;
4399   }
4400   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4401     warning("Shared spaces are not supported in this VM");
4402     FLAG_SET_DEFAULT(UseSharedSpaces, false);
4403     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4404   }
4405   no_shared_spaces("CDS Disabled");
4406 #endif // INCLUDE_CDS
4407 
4408   return JNI_OK;
4409 }
4410 
4411 jint Arguments::apply_ergo() {
4412   // Set flags based on ergonomics.
4413   set_ergonomics_flags();
4414 
4415 #if INCLUDE_JVMCI
4416   set_jvmci_specific_flags();
4417 #endif
4418 
4419   set_shared_spaces_flags();
4420 
4421   // Check the GC selections again.
4422   if (!check_gc_consistency()) {
4423     return JNI_EINVAL;
4424   }
4425 
4426   if (TieredCompilation) {
4427     set_tiered_flags();
4428   } else {
4429     int max_compilation_policy_choice = 1;
4430 #ifdef COMPILER2
4431     if (is_server_compilation_mode_vm()) {
4432       max_compilation_policy_choice = 2;
4433     }
4434 #endif
4435     // Check if the policy is valid.
4436     if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4437       vm_exit_during_initialization(
4438         "Incompatible compilation policy selected", NULL);
4439     }
4440     // Scale CompileThreshold
4441     // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4442     if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4443       FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4444     }
4445   }
4446 
4447 #ifdef COMPILER2
4448 #ifndef PRODUCT
4449   if (PrintIdealGraphLevel > 0) {
4450     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4451   }
4452 #endif
4453 #endif
4454 
4455   // Set heap size based on available physical memory
4456   set_heap_size();
4457 
4458   ArgumentsExt::set_gc_specific_flags();
4459 
4460   // Initialize Metaspace flags and alignments
4461   Metaspace::ergo_initialize();
4462 
4463   // Set bytecode rewriting flags
4464   set_bytecode_flags();
4465 
4466   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4467   jint code = set_aggressive_opts_flags();
4468   if (code != JNI_OK) {
4469     return code;
4470   }
4471 
4472   // Turn off biased locking for locking debug mode flags,
4473   // which are subtly different from each other but neither works with
4474   // biased locking
4475   if (UseHeavyMonitors
4476 #ifdef COMPILER1
4477       || !UseFastLocking
4478 #endif // COMPILER1
4479 #if INCLUDE_JVMCI
4480       || !JVMCIUseFastLocking
4481 #endif
4482     ) {
4483     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4484       // flag set to true on command line; warn the user that they
4485       // can't enable biased locking here
4486       warning("Biased Locking is not supported with locking debug flags"
4487               "; ignoring UseBiasedLocking flag." );
4488     }
4489     UseBiasedLocking = false;
4490   }
4491 
4492 #ifdef CC_INTERP
4493   // Clear flags not supported on zero.
4494   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4495   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4496   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4497   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4498 #endif // CC_INTERP
4499 
4500 #ifdef COMPILER2
4501   if (!EliminateLocks) {
4502     EliminateNestedLocks = false;
4503   }
4504   if (!Inline) {
4505     IncrementalInline = false;
4506   }
4507 #ifndef PRODUCT
4508   if (!IncrementalInline) {
4509     AlwaysIncrementalInline = false;
4510   }
4511 #endif
4512   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4513     // nothing to use the profiling, turn if off
4514     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4515   }
4516 #endif
4517 
4518   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4519     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4520     DebugNonSafepoints = true;
4521   }
4522 
4523   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4524     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4525   }
4526 
4527   if (UseOnStackReplacement && !UseLoopCounter) {
4528     warning("On-stack-replacement requires loop counters; enabling loop counters");
4529     FLAG_SET_DEFAULT(UseLoopCounter, true);
4530   }
4531 
4532 #ifndef PRODUCT
4533   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4534     if (use_vm_log()) {
4535       LogVMOutput = true;
4536     }
4537   }
4538 #endif // PRODUCT
4539 
4540   if (PrintCommandLineFlags) {
4541     CommandLineFlags::printSetFlags(tty);
4542   }
4543 
4544   // Apply CPU specific policy for the BiasedLocking
4545   if (UseBiasedLocking) {
4546     if (!VM_Version::use_biased_locking() &&
4547         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4548       UseBiasedLocking = false;
4549     }
4550   }
4551 #ifdef COMPILER2
4552   if (!UseBiasedLocking || EmitSync != 0) {
4553     UseOptoBiasInlining = false;
4554   }
4555 #endif
4556 
4557   return JNI_OK;
4558 }
4559 
4560 jint Arguments::adjust_after_os() {
4561   if (UseNUMA) {
4562     if (UseParallelGC || UseParallelOldGC) {
4563       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4564          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4565       }
4566     }
4567     // UseNUMAInterleaving is set to ON for all collectors and
4568     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4569     // such as the parallel collector for Linux and Solaris will
4570     // interleave old gen and survivor spaces on top of NUMA
4571     // allocation policy for the eden space.
4572     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4573     // all platforms and ParallelGC on Windows will interleave all
4574     // of the heap spaces across NUMA nodes.
4575     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4576       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4577     }
4578   }
4579   return JNI_OK;
4580 }
4581 
4582 int Arguments::PropertyList_count(SystemProperty* pl) {
4583   int count = 0;
4584   while(pl != NULL) {
4585     count++;
4586     pl = pl->next();
4587   }
4588   return count;
4589 }
4590 
4591 // Return the number of readable properties.
4592 int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4593   int count = 0;
4594   while(pl != NULL) {
4595     if (pl->is_readable()) {
4596       count++;
4597     }
4598     pl = pl->next();
4599   }
4600   return count;
4601 }
4602 
4603 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4604   assert(key != NULL, "just checking");
4605   SystemProperty* prop;
4606   for (prop = pl; prop != NULL; prop = prop->next()) {
4607     if (strcmp(key, prop->key()) == 0) return prop->value();
4608   }
4609   return NULL;
4610 }
4611 
4612 // Return the value of the requested property provided that it is a readable property.
4613 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4614   assert(key != NULL, "just checking");
4615   SystemProperty* prop;
4616   // Return the property value if the keys match and the property is not internal or
4617   // it's the special internal property "jdk.boot.class.path.append".
4618   for (prop = pl; prop != NULL; prop = prop->next()) {
4619     if (strcmp(key, prop->key()) == 0) {
4620       if (!prop->internal()) {
4621         return prop->value();
4622       } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4623         return prop->value();
4624       } else {
4625         // Property is internal and not jdk.boot.class.path.append so return NULL.
4626         return NULL;
4627       }
4628     }
4629   }
4630   return NULL;
4631 }
4632 
4633 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4634   int count = 0;
4635   const char* ret_val = NULL;
4636 
4637   while(pl != NULL) {
4638     if(count >= index) {
4639       ret_val = pl->key();
4640       break;
4641     }
4642     count++;
4643     pl = pl->next();
4644   }
4645 
4646   return ret_val;
4647 }
4648 
4649 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4650   int count = 0;
4651   char* ret_val = NULL;
4652 
4653   while(pl != NULL) {
4654     if(count >= index) {
4655       ret_val = pl->value();
4656       break;
4657     }
4658     count++;
4659     pl = pl->next();
4660   }
4661 
4662   return ret_val;
4663 }
4664 
4665 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4666   SystemProperty* p = *plist;
4667   if (p == NULL) {
4668     *plist = new_p;
4669   } else {
4670     while (p->next() != NULL) {
4671       p = p->next();
4672     }
4673     p->set_next(new_p);
4674   }
4675 }
4676 
4677 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4678                                  bool writeable, bool internal) {
4679   if (plist == NULL)
4680     return;
4681 
4682   SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4683   PropertyList_add(plist, new_p);
4684 }
4685 
4686 void Arguments::PropertyList_add(SystemProperty *element) {
4687   PropertyList_add(&_system_properties, element);
4688 }
4689 
4690 // This add maintains unique property key in the list.
4691 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4692                                         PropertyAppendable append, PropertyWriteable writeable,
4693                                         PropertyInternal internal) {
4694   if (plist == NULL)
4695     return;
4696 
4697   // If property key exist then update with new value.
4698   SystemProperty* prop;
4699   for (prop = *plist; prop != NULL; prop = prop->next()) {
4700     if (strcmp(k, prop->key()) == 0) {
4701       if (append == AppendProperty) {
4702         prop->append_value(v);
4703       } else {
4704         prop->set_value(v);
4705       }
4706       return;
4707     }
4708   }
4709 
4710   PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4711 }
4712 
4713 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4714 // Returns true if all of the source pointed by src has been copied over to
4715 // the destination buffer pointed by buf. Otherwise, returns false.
4716 // Notes:
4717 // 1. If the length (buflen) of the destination buffer excluding the
4718 // NULL terminator character is not long enough for holding the expanded
4719 // pid characters, it also returns false instead of returning the partially
4720 // expanded one.
4721 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4722 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4723                                 char* buf, size_t buflen) {
4724   const char* p = src;
4725   char* b = buf;
4726   const char* src_end = &src[srclen];
4727   char* buf_end = &buf[buflen - 1];
4728 
4729   while (p < src_end && b < buf_end) {
4730     if (*p == '%') {
4731       switch (*(++p)) {
4732       case '%':         // "%%" ==> "%"
4733         *b++ = *p++;
4734         break;
4735       case 'p':  {       //  "%p" ==> current process id
4736         // buf_end points to the character before the last character so
4737         // that we could write '\0' to the end of the buffer.
4738         size_t buf_sz = buf_end - b + 1;
4739         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4740 
4741         // if jio_snprintf fails or the buffer is not long enough to hold
4742         // the expanded pid, returns false.
4743         if (ret < 0 || ret >= (int)buf_sz) {
4744           return false;
4745         } else {
4746           b += ret;
4747           assert(*b == '\0', "fail in copy_expand_pid");
4748           if (p == src_end && b == buf_end + 1) {
4749             // reach the end of the buffer.
4750             return true;
4751           }
4752         }
4753         p++;
4754         break;
4755       }
4756       default :
4757         *b++ = '%';
4758       }
4759     } else {
4760       *b++ = *p++;
4761     }
4762   }
4763   *b = '\0';
4764   return (p == src_end); // return false if not all of the source was copied
4765 }