1 /*
   2  * Copyright (c) 1997, 2016, 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/stringTable.hpp"
  29 #include "classfile/symbolTable.hpp"
  30 #include "code/codeCacheExtensions.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/logTag.hpp"
  37 #include "logging/logConfiguration.hpp"
  38 #include "memory/allocation.inline.hpp"
  39 #include "memory/universe.inline.hpp"
  40 #include "oops/oop.inline.hpp"
  41 #include "prims/jvmtiExport.hpp"
  42 #include "runtime/arguments.hpp"
  43 #include "runtime/arguments_ext.hpp"
  44 #include "runtime/commandLineFlagConstraintList.hpp"
  45 #include "runtime/commandLineFlagRangeList.hpp"
  46 #include "runtime/globals.hpp"
  47 #include "runtime/globals_extension.hpp"
  48 #include "runtime/java.hpp"
  49 #include "runtime/os.hpp"
  50 #include "runtime/vm_version.hpp"
  51 #include "services/management.hpp"
  52 #include "services/memTracker.hpp"
  53 #include "utilities/defaultStream.hpp"
  54 #include "utilities/macros.hpp"
  55 #include "utilities/stringUtils.hpp"
  56 #if INCLUDE_JVMCI
  57 #include "jvmci/jvmciRuntime.hpp"
  58 #endif
  59 #if INCLUDE_ALL_GCS
  60 #include "gc/cms/compactibleFreeListSpace.hpp"
  61 #include "gc/g1/g1CollectedHeap.inline.hpp"
  62 #include "gc/parallel/parallelScavengeHeap.hpp"
  63 #endif // INCLUDE_ALL_GCS
  64 
  65 // Note: This is a special bug reporting site for the JVM
  66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  67 #define DEFAULT_JAVA_LAUNCHER  "generic"
  68 
  69 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  70 do {                                                                  \
  71   if (gc) {                                                           \
  72     if (FLAG_IS_CMDLINE(gc)) {                                        \
  73       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  74     }                                                                 \
  75     FLAG_SET_DEFAULT(gc, false);                                      \
  76   }                                                                   \
  77 } while(0)
  78 
  79 char*  Arguments::_jvm_flags_file               = NULL;
  80 char** Arguments::_jvm_flags_array              = NULL;
  81 int    Arguments::_num_jvm_flags                = 0;
  82 char** Arguments::_jvm_args_array               = NULL;
  83 int    Arguments::_num_jvm_args                 = 0;
  84 char*  Arguments::_java_command                 = NULL;
  85 SystemProperty* Arguments::_system_properties   = NULL;
  86 const char*  Arguments::_gc_log_filename        = NULL;
  87 bool   Arguments::_has_profile                  = false;
  88 size_t Arguments::_conservative_max_heap_alignment = 0;
  89 size_t Arguments::_min_heap_size                = 0;
  90 Arguments::Mode Arguments::_mode                = _mixed;
  91 bool   Arguments::_java_compiler                = false;
  92 bool   Arguments::_xdebug_mode                  = false;
  93 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  94 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  95 int    Arguments::_sun_java_launcher_pid        = -1;
  96 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
  97 
  98 // These parameters are reset in method parse_vm_init_args()
  99 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 100 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 101 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 102 bool   Arguments::_ClipInlining                 = ClipInlining;
 103 intx   Arguments::_Tier3InvokeNotifyFreqLog     = Tier3InvokeNotifyFreqLog;
 104 intx   Arguments::_Tier4InvocationThreshold     = Tier4InvocationThreshold;
 105 
 106 char*  Arguments::SharedArchivePath             = NULL;
 107 
 108 AgentLibraryList Arguments::_libraryList;
 109 AgentLibraryList Arguments::_agentList;
 110 
 111 abort_hook_t     Arguments::_abort_hook         = NULL;
 112 exit_hook_t      Arguments::_exit_hook          = NULL;
 113 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 114 
 115 
 116 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 117 SystemProperty *Arguments::_java_library_path = NULL;
 118 SystemProperty *Arguments::_java_home = NULL;
 119 SystemProperty *Arguments::_java_class_path = NULL;
 120 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 121 
 122 char* Arguments::_ext_dirs = NULL;
 123 
 124 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 125 // part of the option string.
 126 static bool match_option(const JavaVMOption *option, const char* name,
 127                          const char** tail) {
 128   size_t len = strlen(name);
 129   if (strncmp(option->optionString, name, len) == 0) {
 130     *tail = option->optionString + len;
 131     return true;
 132   } else {
 133     return false;
 134   }
 135 }
 136 
 137 // Check if 'option' matches 'name'. No "tail" is allowed.
 138 static bool match_option(const JavaVMOption *option, const char* name) {
 139   const char* tail = NULL;
 140   bool result = match_option(option, name, &tail);
 141   if (tail != NULL && *tail == '\0') {
 142     return result;
 143   } else {
 144     return false;
 145   }
 146 }
 147 
 148 // Return true if any of the strings in null-terminated array 'names' matches.
 149 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 150 // the option must match exactly.
 151 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 152   bool tail_allowed) {
 153   for (/* empty */; *names != NULL; ++names) {
 154     if (match_option(option, *names, tail)) {
 155       if (**tail == '\0' || tail_allowed && **tail == ':') {
 156         return true;
 157       }
 158     }
 159   }
 160   return false;
 161 }
 162 
 163 static void logOption(const char* opt) {
 164   if (PrintVMOptions) {
 165     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 166   }
 167 }
 168 
 169 // Process java launcher properties.
 170 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 171   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 172   // sun.java.launcher.pid is defined.
 173   // Must do this before setting up other system properties,
 174   // as some of them may depend on launcher type.
 175   for (int index = 0; index < args->nOptions; index++) {
 176     const JavaVMOption* option = args->options + index;
 177     const char* tail;
 178 
 179     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 180       process_java_launcher_argument(tail, option->extraInfo);
 181       continue;
 182     }
 183     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 184       if (strcmp(tail, "true") == 0) {
 185         _sun_java_launcher_is_altjvm = true;
 186       }
 187       continue;
 188     }
 189     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 190       _sun_java_launcher_pid = atoi(tail);
 191       continue;
 192     }
 193   }
 194 }
 195 
 196 // Initialize system properties key and value.
 197 void Arguments::init_system_properties() {
 198   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 199                                                                  "Java Virtual Machine Specification",  false));
 200   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 201   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 202   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 203   PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(),  false));
 204 
 205   // Following are JVMTI agent writable properties.
 206   // Properties values are set to NULL and they are
 207   // os specific they are initialized in os::init_system_properties_values().
 208   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 209   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 210   _java_home =  new SystemProperty("java.home", NULL,  true);
 211   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 212 
 213   _java_class_path = new SystemProperty("java.class.path", "",  true);
 214 
 215   // Add to System Property list.
 216   PropertyList_add(&_system_properties, _sun_boot_library_path);
 217   PropertyList_add(&_system_properties, _java_library_path);
 218   PropertyList_add(&_system_properties, _java_home);
 219   PropertyList_add(&_system_properties, _java_class_path);
 220   PropertyList_add(&_system_properties, _sun_boot_class_path);
 221 
 222   // Set OS specific system properties values
 223   os::init_system_properties_values();
 224 
 225   JVMCI_ONLY(JVMCIRuntime::init_system_properties(&_system_properties);)
 226 }
 227 
 228 // Update/Initialize System properties after JDK version number is known
 229 void Arguments::init_version_specific_system_properties() {
 230   enum { bufsz = 16 };
 231   char buffer[bufsz];
 232   const char* spec_vendor = "Oracle Corporation";
 233   uint32_t spec_version = JDK_Version::current().major_version();
 234 
 235   jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
 236 
 237   PropertyList_add(&_system_properties,
 238       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 239   PropertyList_add(&_system_properties,
 240       new SystemProperty("java.vm.specification.version", buffer, false));
 241   PropertyList_add(&_system_properties,
 242       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 243 }
 244 
 245 /*
 246  *  -XX argument processing:
 247  *
 248  *  -XX arguments are defined in several places, such as:
 249  *      globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
 250  *  -XX arguments are parsed in parse_argument().
 251  *  -XX argument bounds checking is done in check_vm_args_consistency().
 252  *
 253  * Over time -XX arguments may change. There are mechanisms to handle common cases:
 254  *
 255  *      ALIASED: An option that is simply another name for another option. This is often
 256  *               part of the process of deprecating a flag, but not all aliases need
 257  *               to be deprecated.
 258  *
 259  *               Create an alias for an option by adding the old and new option names to the
 260  *               "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
 261  *
 262  *   DEPRECATED: An option that is supported, but a warning is printed to let the user know that
 263  *               support may be removed in the future. Both regular and aliased options may be
 264  *               deprecated.
 265  *
 266  *               Add a deprecation warning for an option (or alias) by adding an entry in the
 267  *               "special_jvm_flags" table and setting the "deprecated_in" field.
 268  *               Often an option "deprecated" in one major release will
 269  *               be made "obsolete" in the next. In this case the entry should also have it's
 270  *               "obsolete_in" field set.
 271  *
 272  *     OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
 273  *               on the command line. A warning is printed to let the user know that option might not
 274  *               be accepted in the future.
 275  *
 276  *               Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
 277  *               table and setting the "obsolete_in" field.
 278  *
 279  *      EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
 280  *               to the current JDK version. The system will flatly refuse to admit the existence of
 281  *               the flag. This allows a flag to die automatically over JDK releases.
 282  *
 283  *               Note that manual cleanup of expired options should be done at major JDK version upgrades:
 284  *                  - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
 285  *                  - Newly obsolete or expired deprecated options should have their global variable
 286  *                    definitions removed (from globals.hpp, etc) and related implementations removed.
 287  *
 288  * Recommended approach for removing options:
 289  *
 290  * To remove options commonly used by customers (e.g. product, commercial -XX options), use
 291  * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
 292  *
 293  * To remove internal options (e.g. diagnostic, experimental, develop options), use
 294  * a 2-step model adding major release numbers to the obsolete and expire columns.
 295  *
 296  * To change the name of an option, use the alias table as well as a 2-step
 297  * model adding major release numbers to the deprecate and expire columns.
 298  * Think twice about aliasing commonly used customer options.
 299  *
 300  * There are times when it is appropriate to leave a future release number as undefined.
 301  *
 302  * Tests:  Aliases should be tested in VMAliasOptions.java.
 303  *         Deprecated options should be tested in VMDeprecatedOptions.java.
 304  */
 305 
 306 // Obsolete or deprecated -XX flag.
 307 typedef struct {
 308   const char* name;
 309   JDK_Version deprecated_in; // When the deprecation warning started (or "undefined").
 310   JDK_Version obsolete_in;   // When the obsolete warning started (or "undefined").
 311   JDK_Version expired_in;    // When the option expires (or "undefined").
 312 } SpecialFlag;
 313 
 314 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
 315 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
 316 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
 317 // the command-line as usual, but will issue a warning.
 318 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
 319 // the command-line, while issuing a warning and ignoring the flag value.
 320 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
 321 // existence of the flag.
 322 //
 323 // MANUAL CLEANUP ON JDK VERSION UPDATES:
 324 // This table ensures that the handling of options will update automatically when the JDK
 325 // version is incremented, but the source code needs to be cleanup up manually:
 326 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
 327 //   variable should be removed, as well as users of the variable.
 328 // - As "deprecated" options age into "obsolete" options, move the entry into the
 329 //   "Obsolete Flags" section of the table.
 330 // - All expired options should be removed from the table.
 331 static SpecialFlag const special_jvm_flags[] = {
 332   // -------------- Deprecated Flags --------------
 333   // --- Non-alias flags - sorted by obsolete_in then expired_in:
 334   { "MaxGCMinorPauseMillis",        JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
 335   { "UseParNewGC",                  JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
 336 
 337   // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
 338   { "DefaultMaxRAMFraction",        JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
 339   { "CreateMinidumpOnCrash",        JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 340   { "CMSMarkStackSizeMax",          JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
 341   { "CMSMarkStackSize",             JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
 342   { "G1MarkStackSize",              JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
 343   { "ParallelMarkingThreads",       JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
 344   { "ParallelCMSThreads",           JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(10) },
 345 
 346   // -------------- Obsolete Flags - sorted by expired_in --------------
 347   { "UseOldInlining",                JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 348   { "SafepointPollOffset",           JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 349   { "UseBoundThreads",               JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 350   { "DefaultThreadPriority",         JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 351   { "NoYieldsInMicrolock",           JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 352   { "BackEdgeThreshold",             JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 353   { "UseNewReflection",              JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 354   { "ReflectionWrapResolutionErrors",JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 355   { "VerifyReflectionBytecodes",     JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 356   { "AutoShutdownNMT",               JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 357   { "NmethodSweepFraction",          JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 358   { "NmethodSweepCheckInterval",     JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 359   { "CodeCacheMinimumFreeSpace",     JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 360 #ifndef ZERO
 361   { "UseFastAccessorMethods",        JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 362   { "UseFastEmptyMethods",           JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 363 #endif // ZERO
 364   { "UseCompilerSafepoints",         JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 365   { "AdaptiveSizePausePolicy",       JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 366   { "ParallelGCRetainPLAB",          JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 367   { "ThreadSafetyMargin",            JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 368   { "LazyBootClassLoader",           JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 369   { "StarvationMonitorInterval",     JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 370   { "PreInflateSpin",                JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 371   { "JNIDetachReleasesMonitors",     JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 372   { "UseAltSigs",                    JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(10) },
 373 
 374 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
 375   { "dep > obs",                    JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
 376   { "dep > exp ",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
 377   { "obs > exp ",                   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
 378   { "not deprecated or obsolete",   JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
 379   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 380   { "dup option",                   JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
 381   { "BytecodeVerificationRemote",   JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() },
 382 #endif
 383 
 384   { NULL, JDK_Version(0), JDK_Version(0) }
 385 };
 386 
 387 // Flags that are aliases for other flags.
 388 typedef struct {
 389   const char* alias_name;
 390   const char* real_name;
 391 } AliasedFlag;
 392 
 393 static AliasedFlag const aliased_jvm_flags[] = {
 394   { "DefaultMaxRAMFraction",    "MaxRAMFraction"    },
 395   { "CMSMarkStackSizeMax",      "MarkStackSizeMax"  },
 396   { "CMSMarkStackSize",         "MarkStackSize"     },
 397   { "G1MarkStackSize",          "MarkStackSize"     },
 398   { "ParallelMarkingThreads",   "ConcGCThreads"     },
 399   { "ParallelCMSThreads",       "ConcGCThreads"     },
 400   { "CreateMinidumpOnCrash",    "CreateCoredumpOnCrash" },
 401   { NULL, NULL}
 402 };
 403 
 404 static AliasedLoggingFlag const aliased_logging_flags[] = {
 405   { "TraceClassLoading",         LogLevel::Info,  true,  LogTag::_classload },
 406   { "TraceClassUnloading",       LogLevel::Info,  true,  LogTag::_classunload },
 407   { "TraceClassResolution",      LogLevel::Info,  true,  LogTag::_classresolve },
 408   { "TraceExceptions",           LogLevel::Info,  true,  LogTag::_exceptions },
 409   { "TraceMonitorInflation",     LogLevel::Debug, true,  LogTag::_monitorinflation },
 410   { NULL,                        LogLevel::Off,   false, LogTag::__NO_TAG }
 411 };
 412 
 413 // Return true if "v" is less than "other", where "other" may be "undefined".
 414 static bool version_less_than(JDK_Version v, JDK_Version other) {
 415   assert(!v.is_undefined(), "must be defined");
 416   if (!other.is_undefined() && v.compare(other) >= 0) {
 417     return false;
 418   } else {
 419     return true;
 420   }
 421 }
 422 
 423 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
 424   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 425     if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 426       flag = special_jvm_flags[i];
 427       return true;
 428     }
 429   }
 430   return false;
 431 }
 432 
 433 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
 434   assert(version != NULL, "Must provide a version buffer");
 435   SpecialFlag flag;
 436   if (lookup_special_flag(flag_name, flag)) {
 437     if (!flag.obsolete_in.is_undefined()) {
 438       if (version_less_than(JDK_Version::current(), flag.expired_in)) {
 439         *version = flag.obsolete_in;
 440         return true;
 441       }
 442     }
 443   }
 444   return false;
 445 }
 446 
 447 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
 448   assert(version != NULL, "Must provide a version buffer");
 449   SpecialFlag flag;
 450   if (lookup_special_flag(flag_name, flag)) {
 451     if (!flag.deprecated_in.is_undefined()) {
 452       if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
 453           version_less_than(JDK_Version::current(), flag.expired_in)) {
 454         *version = flag.deprecated_in;
 455         return 1;
 456       } else {
 457         return -1;
 458       }
 459     }
 460   }
 461   return 0;
 462 }
 463 
 464 const char* Arguments::real_flag_name(const char *flag_name) {
 465   for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
 466     const AliasedFlag& flag_status = aliased_jvm_flags[i];
 467     if (strcmp(flag_status.alias_name, flag_name) == 0) {
 468         return flag_status.real_name;
 469     }
 470   }
 471   return flag_name;
 472 }
 473 
 474 #ifdef ASSERT
 475 static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
 476   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 477     if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
 478       return true;
 479     }
 480   }
 481   return false;
 482 }
 483 
 484 static bool verify_special_jvm_flags() {
 485   bool success = true;
 486   for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
 487     const SpecialFlag& flag = special_jvm_flags[i];
 488     if (lookup_special_flag(flag.name, i)) {
 489       warning("Duplicate special flag declaration \"%s\"", flag.name);
 490       success = false;
 491     }
 492     if (flag.deprecated_in.is_undefined() &&
 493         flag.obsolete_in.is_undefined()) {
 494       warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
 495       success = false;
 496     }
 497 
 498     if (!flag.deprecated_in.is_undefined()) {
 499       if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
 500         warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
 501         success = false;
 502       }
 503 
 504       if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
 505         warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
 506         success = false;
 507       }
 508     }
 509 
 510     if (!flag.obsolete_in.is_undefined()) {
 511       if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
 512         warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
 513         success = false;
 514       }
 515 
 516       // if flag has become obsolete it should not have a "globals" flag defined anymore.
 517       if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
 518         if (Flag::find_flag(flag.name) != NULL) {
 519           warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
 520           success = false;
 521         }
 522       }
 523     }
 524 
 525     if (!flag.expired_in.is_undefined()) {
 526       // if flag has become expired it should not have a "globals" flag defined anymore.
 527       if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
 528         if (Flag::find_flag(flag.name) != NULL) {
 529           warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
 530           success = false;
 531         }
 532       }
 533     }
 534 
 535   }
 536   return success;
 537 }
 538 #endif
 539 
 540 // Constructs the system class path (aka boot class path) from the following
 541 // components, in order:
 542 //
 543 //     prefix           // from -Xbootclasspath/p:...
 544 //     base             // from os::get_system_properties() or -Xbootclasspath=
 545 //     suffix           // from -Xbootclasspath/a:...
 546 //
 547 // This could be AllStatic, but it isn't needed after argument processing is
 548 // complete.
 549 class SysClassPath: public StackObj {
 550 public:
 551   SysClassPath(const char* base);
 552   ~SysClassPath();
 553 
 554   inline void set_base(const char* base);
 555   inline void add_prefix(const char* prefix);
 556   inline void add_suffix_to_prefix(const char* suffix);
 557   inline void add_suffix(const char* suffix);
 558   inline void reset_path(const char* base);
 559 
 560   inline const char* get_base()     const { return _items[_scp_base]; }
 561   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 562   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 563 
 564   // Combine all the components into a single c-heap-allocated string; caller
 565   // must free the string if/when no longer needed.
 566   char* combined_path();
 567 
 568 private:
 569   // Utility routines.
 570   static char* add_to_path(const char* path, const char* str, bool prepend);
 571   static char* add_jars_to_path(char* path, const char* directory);
 572 
 573   inline void reset_item_at(int index);
 574 
 575   // Array indices for the items that make up the sysclasspath.  All except the
 576   // base are allocated in the C heap and freed by this class.
 577   enum {
 578     _scp_prefix,        // from -Xbootclasspath/p:...
 579     _scp_base,          // the default sysclasspath
 580     _scp_suffix,        // from -Xbootclasspath/a:...
 581     _scp_nitems         // the number of items, must be last.
 582   };
 583 
 584   const char* _items[_scp_nitems];
 585 };
 586 
 587 SysClassPath::SysClassPath(const char* base) {
 588   memset(_items, 0, sizeof(_items));
 589   _items[_scp_base] = base;
 590 }
 591 
 592 SysClassPath::~SysClassPath() {
 593   // Free everything except the base.
 594   for (int i = 0; i < _scp_nitems; ++i) {
 595     if (i != _scp_base) reset_item_at(i);
 596   }
 597 }
 598 
 599 inline void SysClassPath::set_base(const char* base) {
 600   _items[_scp_base] = base;
 601 }
 602 
 603 inline void SysClassPath::add_prefix(const char* prefix) {
 604   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 605 }
 606 
 607 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 608   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 609 }
 610 
 611 inline void SysClassPath::add_suffix(const char* suffix) {
 612   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 613 }
 614 
 615 inline void SysClassPath::reset_item_at(int index) {
 616   assert(index < _scp_nitems && index != _scp_base, "just checking");
 617   if (_items[index] != NULL) {
 618     FREE_C_HEAP_ARRAY(char, _items[index]);
 619     _items[index] = NULL;
 620   }
 621 }
 622 
 623 inline void SysClassPath::reset_path(const char* base) {
 624   // Clear the prefix and suffix.
 625   reset_item_at(_scp_prefix);
 626   reset_item_at(_scp_suffix);
 627   set_base(base);
 628 }
 629 
 630 //------------------------------------------------------------------------------
 631 
 632 
 633 // Combine the bootclasspath elements, some of which may be null, into a single
 634 // c-heap-allocated string.
 635 char* SysClassPath::combined_path() {
 636   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 637 
 638   size_t lengths[_scp_nitems];
 639   size_t total_len = 0;
 640 
 641   const char separator = *os::path_separator();
 642 
 643   // Get the lengths.
 644   int i;
 645   for (i = 0; i < _scp_nitems; ++i) {
 646     if (_items[i] != NULL) {
 647       lengths[i] = strlen(_items[i]);
 648       // Include space for the separator char (or a NULL for the last item).
 649       total_len += lengths[i] + 1;
 650     }
 651   }
 652   assert(total_len > 0, "empty sysclasspath not allowed");
 653 
 654   // Copy the _items to a single string.
 655   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 656   char* cp_tmp = cp;
 657   for (i = 0; i < _scp_nitems; ++i) {
 658     if (_items[i] != NULL) {
 659       memcpy(cp_tmp, _items[i], lengths[i]);
 660       cp_tmp += lengths[i];
 661       *cp_tmp++ = separator;
 662     }
 663   }
 664   *--cp_tmp = '\0';     // Replace the extra separator.
 665   return cp;
 666 }
 667 
 668 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 669 char*
 670 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 671   char *cp;
 672 
 673   assert(str != NULL, "just checking");
 674   if (path == NULL) {
 675     size_t len = strlen(str) + 1;
 676     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 677     memcpy(cp, str, len);                       // copy the trailing null
 678   } else {
 679     const char separator = *os::path_separator();
 680     size_t old_len = strlen(path);
 681     size_t str_len = strlen(str);
 682     size_t len = old_len + str_len + 2;
 683 
 684     if (prepend) {
 685       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 686       char* cp_tmp = cp;
 687       memcpy(cp_tmp, str, str_len);
 688       cp_tmp += str_len;
 689       *cp_tmp = separator;
 690       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 691       FREE_C_HEAP_ARRAY(char, path);
 692     } else {
 693       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 694       char* cp_tmp = cp + old_len;
 695       *cp_tmp = separator;
 696       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 697     }
 698   }
 699   return cp;
 700 }
 701 
 702 // Scan the directory and append any jar or zip files found to path.
 703 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 704 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 705   DIR* dir = os::opendir(directory);
 706   if (dir == NULL) return path;
 707 
 708   char dir_sep[2] = { '\0', '\0' };
 709   size_t directory_len = strlen(directory);
 710   const char fileSep = *os::file_separator();
 711   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 712 
 713   /* Scan the directory for jars/zips, appending them to path. */
 714   struct dirent *entry;
 715   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 716   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 717     const char* name = entry->d_name;
 718     const char* ext = name + strlen(name) - 4;
 719     bool isJarOrZip = ext > name &&
 720       (os::file_name_strcmp(ext, ".jar") == 0 ||
 721        os::file_name_strcmp(ext, ".zip") == 0);
 722     if (isJarOrZip) {
 723       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 724       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 725       path = add_to_path(path, jarpath, false);
 726       FREE_C_HEAP_ARRAY(char, jarpath);
 727     }
 728   }
 729   FREE_C_HEAP_ARRAY(char, dbuf);
 730   os::closedir(dir);
 731   return path;
 732 }
 733 
 734 // Parses a memory size specification string.
 735 static bool atomull(const char *s, julong* result) {
 736   julong n = 0;
 737   int args_read = 0;
 738   bool is_hex = false;
 739   // Skip leading 0[xX] for hexadecimal
 740   if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
 741     s += 2;
 742     is_hex = true;
 743     args_read = sscanf(s, JULONG_FORMAT_X, &n);
 744   } else {
 745     args_read = sscanf(s, JULONG_FORMAT, &n);
 746   }
 747   if (args_read != 1) {
 748     return false;
 749   }
 750   while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
 751     s++;
 752   }
 753   // 4705540: illegal if more characters are found after the first non-digit
 754   if (strlen(s) > 1) {
 755     return false;
 756   }
 757   switch (*s) {
 758     case 'T': case 't':
 759       *result = n * G * K;
 760       // Check for overflow.
 761       if (*result/((julong)G * K) != n) return false;
 762       return true;
 763     case 'G': case 'g':
 764       *result = n * G;
 765       if (*result/G != n) return false;
 766       return true;
 767     case 'M': case 'm':
 768       *result = n * M;
 769       if (*result/M != n) return false;
 770       return true;
 771     case 'K': case 'k':
 772       *result = n * K;
 773       if (*result/K != n) return false;
 774       return true;
 775     case '\0':
 776       *result = n;
 777       return true;
 778     default:
 779       return false;
 780   }
 781 }
 782 
 783 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 784   if (size < min_size) return arg_too_small;
 785   // Check that size will fit in a size_t (only relevant on 32-bit)
 786   if (size > max_uintx) return arg_too_big;
 787   return arg_in_range;
 788 }
 789 
 790 // Describe an argument out of range error
 791 void Arguments::describe_range_error(ArgsRange errcode) {
 792   switch(errcode) {
 793   case arg_too_big:
 794     jio_fprintf(defaultStream::error_stream(),
 795                 "The specified size exceeds the maximum "
 796                 "representable size.\n");
 797     break;
 798   case arg_too_small:
 799   case arg_unreadable:
 800   case arg_in_range:
 801     // do nothing for now
 802     break;
 803   default:
 804     ShouldNotReachHere();
 805   }
 806 }
 807 
 808 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
 809   if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
 810     return true;
 811   } else {
 812     return false;
 813   }
 814 }
 815 
 816 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
 817   char* end;
 818   errno = 0;
 819   double v = strtod(value, &end);
 820   if ((errno != 0) || (*end != 0)) {
 821     return false;
 822   }
 823 
 824   if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
 825     return true;
 826   }
 827   return false;
 828 }
 829 
 830 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
 831   julong v;
 832   int int_v;
 833   intx intx_v;
 834   bool is_neg = false;
 835   Flag* result = Flag::find_flag(name, strlen(name));
 836 
 837   if (result == NULL) {
 838     return false;
 839   }
 840 
 841   // Check the sign first since atomull() parses only unsigned values.
 842   if (*value == '-') {
 843     if (!result->is_intx() && !result->is_int()) {
 844       return false;
 845     }
 846     value++;
 847     is_neg = true;
 848   }
 849   if (!atomull(value, &v)) {
 850     return false;
 851   }
 852   if (result->is_int()) {
 853     int_v = (int) v;
 854     if (is_neg) {
 855       int_v = -int_v;
 856     }
 857     return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS;
 858   } else if (result->is_uint()) {
 859     uint uint_v = (uint) v;
 860     return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS;
 861   } else if (result->is_intx()) {
 862     intx_v = (intx) v;
 863     if (is_neg) {
 864       intx_v = -intx_v;
 865     }
 866     return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS;
 867   } else if (result->is_uintx()) {
 868     uintx uintx_v = (uintx) v;
 869     return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS;
 870   } else if (result->is_uint64_t()) {
 871     uint64_t uint64_t_v = (uint64_t) v;
 872     return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS;
 873   } else if (result->is_size_t()) {
 874     size_t size_t_v = (size_t) v;
 875     return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS;
 876   } else {
 877     return false;
 878   }
 879 }
 880 
 881 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
 882   if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
 883   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 884   FREE_C_HEAP_ARRAY(char, value);
 885   return true;
 886 }
 887 
 888 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
 889   const char* old_value = "";
 890   if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
 891   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 892   size_t new_len = strlen(new_value);
 893   const char* value;
 894   char* free_this_too = NULL;
 895   if (old_len == 0) {
 896     value = new_value;
 897   } else if (new_len == 0) {
 898     value = old_value;
 899   } else {
 900     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 901     // each new setting adds another LINE to the switch:
 902     sprintf(buf, "%s\n%s", old_value, new_value);
 903     value = buf;
 904     free_this_too = buf;
 905   }
 906   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 907   // CommandLineFlags always returns a pointer that needs freeing.
 908   FREE_C_HEAP_ARRAY(char, value);
 909   if (free_this_too != NULL) {
 910     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 911     FREE_C_HEAP_ARRAY(char, free_this_too);
 912   }
 913   return true;
 914 }
 915 
 916 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
 917   const char* real_name = real_flag_name(arg);
 918   JDK_Version since = JDK_Version();
 919   switch (is_deprecated_flag(arg, &since)) {
 920     case -1:
 921       return NULL; // obsolete or expired, don't process normally
 922     case 0:
 923       return real_name;
 924     case 1: {
 925       if (warn) {
 926         char version[256];
 927         since.to_string(version, sizeof(version));
 928         if (real_name != arg) {
 929           warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
 930                   arg, version, real_name);
 931         } else {
 932           warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
 933                   arg, version);
 934         }
 935       }
 936       return real_name;
 937     }
 938   }
 939   ShouldNotReachHere();
 940   return NULL;
 941 }
 942 
 943 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name){
 944   for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
 945     const AliasedLoggingFlag& alf = aliased_logging_flags[i];
 946     if (strcmp(alf.alias_name, name) == 0) {
 947       return alf;
 948     }
 949   }
 950   AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LogTag::__NO_TAG};
 951   return a;
 952 }
 953 
 954 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 955 
 956   // range of acceptable characters spelled out for portability reasons
 957 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 958 #define BUFLEN 255
 959   char name[BUFLEN+1];
 960   char dummy;
 961   const char* real_name;
 962   bool warn_if_deprecated = true;
 963   AliasedLoggingFlag alf;
 964 
 965   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 966     alf = catch_logging_aliases(name);
 967     if (alf.alias_name != NULL){
 968       LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag, LogTag::__NO_TAG);
 969       return true;
 970     }
 971     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 972     if (real_name == NULL) {
 973       return false;
 974     }
 975     return set_bool_flag(real_name, false, origin);
 976   }
 977   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 978     alf = catch_logging_aliases(name);
 979     if (alf.alias_name != NULL){
 980       LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag, LogTag::__NO_TAG);
 981       return true;
 982     }
 983     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 984     if (real_name == NULL) {
 985       return false;
 986     }
 987     return set_bool_flag(real_name, true, origin);
 988   }
 989 
 990   char punct;
 991   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 992     const char* value = strchr(arg, '=') + 1;
 993     Flag* flag;
 994 
 995     // this scanf pattern matches both strings (handled here) and numbers (handled later))
 996     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
 997     if (real_name == NULL) {
 998       return false;
 999     }
1000     flag = Flag::find_flag(real_name);
1001     if (flag != NULL && flag->is_ccstr()) {
1002       if (flag->ccstr_accumulates()) {
1003         return append_to_string_flag(real_name, value, origin);
1004       } else {
1005         if (value[0] == '\0') {
1006           value = NULL;
1007         }
1008         return set_string_flag(real_name, value, origin);
1009       }
1010     } else {
1011       warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1012     }
1013   }
1014 
1015   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1016     const char* value = strchr(arg, '=') + 1;
1017     // -XX:Foo:=xxx will reset the string flag to the given value.
1018     if (value[0] == '\0') {
1019       value = NULL;
1020     }
1021     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1022     if (real_name == NULL) {
1023       return false;
1024     }
1025     return set_string_flag(real_name, value, origin);
1026   }
1027 
1028 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1029 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
1030 #define        NUMBER_RANGE    "[0123456789eE+-]"
1031   char value[BUFLEN + 1];
1032   char value2[BUFLEN + 1];
1033   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1034     // Looks like a floating-point number -- try again with more lenient format string
1035     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1036       real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1037       if (real_name == NULL) {
1038         return false;
1039       }
1040       return set_fp_numeric_flag(real_name, value, origin);
1041     }
1042   }
1043 
1044 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1045   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1046     real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1047     if (real_name == NULL) {
1048       return false;
1049     }
1050     return set_numeric_flag(real_name, value, origin);
1051   }
1052 
1053   return false;
1054 }
1055 
1056 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1057   assert(bldarray != NULL, "illegal argument");
1058 
1059   if (arg == NULL) {
1060     return;
1061   }
1062 
1063   int new_count = *count + 1;
1064 
1065   // expand the array and add arg to the last element
1066   if (*bldarray == NULL) {
1067     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
1068   } else {
1069     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
1070   }
1071   (*bldarray)[*count] = os::strdup_check_oom(arg);
1072   *count = new_count;
1073 }
1074 
1075 void Arguments::build_jvm_args(const char* arg) {
1076   add_string(&_jvm_args_array, &_num_jvm_args, arg);
1077 }
1078 
1079 void Arguments::build_jvm_flags(const char* arg) {
1080   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1081 }
1082 
1083 // utility function to return a string that concatenates all
1084 // strings in a given char** array
1085 const char* Arguments::build_resource_string(char** args, int count) {
1086   if (args == NULL || count == 0) {
1087     return NULL;
1088   }
1089   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
1090   for (int i = 1; i < count; i++) {
1091     length += strlen(args[i]) + 1; // add 1 for a space
1092   }
1093   char* s = NEW_RESOURCE_ARRAY(char, length);
1094   strcpy(s, args[0]);
1095   for (int j = 1; j < count; j++) {
1096     strcat(s, " ");
1097     strcat(s, args[j]);
1098   }
1099   return (const char*) s;
1100 }
1101 
1102 void Arguments::print_on(outputStream* st) {
1103   st->print_cr("VM Arguments:");
1104   if (num_jvm_flags() > 0) {
1105     st->print("jvm_flags: "); print_jvm_flags_on(st);
1106     st->cr();
1107   }
1108   if (num_jvm_args() > 0) {
1109     st->print("jvm_args: "); print_jvm_args_on(st);
1110     st->cr();
1111   }
1112   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1113   if (_java_class_path != NULL) {
1114     char* path = _java_class_path->value();
1115     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1116   }
1117   st->print_cr("Launcher Type: %s", _sun_java_launcher);
1118 }
1119 
1120 void Arguments::print_summary_on(outputStream* st) {
1121   // Print the command line.  Environment variables that are helpful for
1122   // reproducing the problem are written later in the hs_err file.
1123   // flags are from setting file
1124   if (num_jvm_flags() > 0) {
1125     st->print_raw("Settings File: ");
1126     print_jvm_flags_on(st);
1127     st->cr();
1128   }
1129   // args are the command line and environment variable arguments.
1130   st->print_raw("Command Line: ");
1131   if (num_jvm_args() > 0) {
1132     print_jvm_args_on(st);
1133   }
1134   // this is the classfile and any arguments to the java program
1135   if (java_command() != NULL) {
1136     st->print("%s", java_command());
1137   }
1138   st->cr();
1139 }
1140 
1141 void Arguments::print_jvm_flags_on(outputStream* st) {
1142   if (_num_jvm_flags > 0) {
1143     for (int i=0; i < _num_jvm_flags; i++) {
1144       st->print("%s ", _jvm_flags_array[i]);
1145     }
1146   }
1147 }
1148 
1149 void Arguments::print_jvm_args_on(outputStream* st) {
1150   if (_num_jvm_args > 0) {
1151     for (int i=0; i < _num_jvm_args; i++) {
1152       st->print("%s ", _jvm_args_array[i]);
1153     }
1154   }
1155 }
1156 
1157 bool Arguments::process_argument(const char* arg,
1158                                  jboolean ignore_unrecognized,
1159                                  Flag::Flags origin) {
1160   JDK_Version since = JDK_Version();
1161 
1162   if (parse_argument(arg, origin)) {
1163     return true;
1164   }
1165 
1166   // Determine if the flag has '+', '-', or '=' characters.
1167   bool has_plus_minus = (*arg == '+' || *arg == '-');
1168   const char* const argname = has_plus_minus ? arg + 1 : arg;
1169 
1170   size_t arg_len;
1171   const char* equal_sign = strchr(argname, '=');
1172   if (equal_sign == NULL) {
1173     arg_len = strlen(argname);
1174   } else {
1175     arg_len = equal_sign - argname;
1176   }
1177 
1178   // Only make the obsolete check for valid arguments.
1179   if (arg_len <= BUFLEN) {
1180     // Construct a string which consists only of the argument name without '+', '-', or '='.
1181     char stripped_argname[BUFLEN+1];
1182     strncpy(stripped_argname, argname, arg_len);
1183     stripped_argname[arg_len] = '\0';  // strncpy may not null terminate.
1184 
1185     if (is_obsolete_flag(stripped_argname, &since)) {
1186       char version[256];
1187       since.to_string(version, sizeof(version));
1188       warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1189       return true;
1190     }
1191   }
1192 
1193   // For locked flags, report a custom error message if available.
1194   // Otherwise, report the standard unrecognized VM option.
1195   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1196   if (found_flag != NULL) {
1197     char locked_message_buf[BUFLEN];
1198     Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1199     if (strlen(locked_message_buf) == 0) {
1200       if (found_flag->is_bool() && !has_plus_minus) {
1201         jio_fprintf(defaultStream::error_stream(),
1202           "Missing +/- setting for VM option '%s'\n", argname);
1203       } else if (!found_flag->is_bool() && has_plus_minus) {
1204         jio_fprintf(defaultStream::error_stream(),
1205           "Unexpected +/- setting in VM option '%s'\n", argname);
1206       } else {
1207         jio_fprintf(defaultStream::error_stream(),
1208           "Improperly specified VM option '%s'\n", argname);
1209       }
1210     } else {
1211 #ifdef PRODUCT
1212       bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1213                          (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1214       if (ignore_unrecognized && mismatched) {
1215         return true;
1216       }
1217 #endif
1218       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1219     }
1220   } else {
1221     if (ignore_unrecognized) {
1222       return true;
1223     }
1224     jio_fprintf(defaultStream::error_stream(),
1225                 "Unrecognized VM option '%s'\n", argname);
1226     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1227     if (fuzzy_matched != NULL) {
1228       jio_fprintf(defaultStream::error_stream(),
1229                   "Did you mean '%s%s%s'? ",
1230                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1231                   fuzzy_matched->_name,
1232                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
1233     }
1234   }
1235 
1236   // allow for commandline "commenting out" options like -XX:#+Verbose
1237   return arg[0] == '#';
1238 }
1239 
1240 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1241   FILE* stream = fopen(file_name, "rb");
1242   if (stream == NULL) {
1243     if (should_exist) {
1244       jio_fprintf(defaultStream::error_stream(),
1245                   "Could not open settings file %s\n", file_name);
1246       return false;
1247     } else {
1248       return true;
1249     }
1250   }
1251 
1252   char token[1024];
1253   int  pos = 0;
1254 
1255   bool in_white_space = true;
1256   bool in_comment     = false;
1257   bool in_quote       = false;
1258   char quote_c        = 0;
1259   bool result         = true;
1260 
1261   int c = getc(stream);
1262   while(c != EOF && pos < (int)(sizeof(token)-1)) {
1263     if (in_white_space) {
1264       if (in_comment) {
1265         if (c == '\n') in_comment = false;
1266       } else {
1267         if (c == '#') in_comment = true;
1268         else if (!isspace(c)) {
1269           in_white_space = false;
1270           token[pos++] = c;
1271         }
1272       }
1273     } else {
1274       if (c == '\n' || (!in_quote && isspace(c))) {
1275         // token ends at newline, or at unquoted whitespace
1276         // this allows a way to include spaces in string-valued options
1277         token[pos] = '\0';
1278         logOption(token);
1279         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1280         build_jvm_flags(token);
1281         pos = 0;
1282         in_white_space = true;
1283         in_quote = false;
1284       } else if (!in_quote && (c == '\'' || c == '"')) {
1285         in_quote = true;
1286         quote_c = c;
1287       } else if (in_quote && (c == quote_c)) {
1288         in_quote = false;
1289       } else {
1290         token[pos++] = c;
1291       }
1292     }
1293     c = getc(stream);
1294   }
1295   if (pos > 0) {
1296     token[pos] = '\0';
1297     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1298     build_jvm_flags(token);
1299   }
1300   fclose(stream);
1301   return result;
1302 }
1303 
1304 //=============================================================================================================
1305 // Parsing of properties (-D)
1306 
1307 const char* Arguments::get_property(const char* key) {
1308   return PropertyList_get_value(system_properties(), key);
1309 }
1310 
1311 bool Arguments::add_property(const char* prop) {
1312   const char* eq = strchr(prop, '=');
1313   const char* key;
1314   const char* value = "";
1315 
1316   if (eq == NULL) {
1317     // property doesn't have a value, thus use passed string
1318     key = prop;
1319   } else {
1320     // property have a value, thus extract it and save to the
1321     // allocated string
1322     size_t key_len = eq - prop;
1323     char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
1324 
1325     strncpy(tmp_key, prop, key_len);
1326     tmp_key[key_len] = '\0';
1327     key = tmp_key;
1328 
1329     value = &prop[key_len + 1];
1330   }
1331 
1332   if (strcmp(key, "java.compiler") == 0) {
1333     process_java_compiler_argument(value);
1334     // Record value in Arguments, but let it get passed to Java.
1335   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1336              strcmp(key, "sun.java.launcher.pid") == 0) {
1337     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1338     // private and are processed in process_sun_java_launcher_properties();
1339     // the sun.java.launcher property is passed on to the java application
1340   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1341     PropertyList_unique_add(&_system_properties, key, value, true);
1342   } else {
1343     if (strcmp(key, "sun.java.command") == 0) {
1344       char *old_java_command = _java_command;
1345       _java_command = os::strdup_check_oom(value, mtInternal);
1346       if (old_java_command != NULL) {
1347         os::free(old_java_command);
1348       }
1349     } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1350       const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1351       // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1352       // its value without going through the property list or making a Java call.
1353       _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1354       if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1355         assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1356         os::free((void *)old_java_vendor_url_bug);
1357       }
1358     }
1359 
1360     // Create new property and add at the end of the list
1361     PropertyList_unique_add(&_system_properties, key, value);
1362   }
1363 
1364   if (key != prop) {
1365     // SystemProperty copy passed value, thus free previously allocated
1366     // memory
1367     FreeHeap((void *)key);
1368   }
1369 
1370   return true;
1371 }
1372 
1373 //===========================================================================================================
1374 // Setting int/mixed/comp mode flags
1375 
1376 void Arguments::set_mode_flags(Mode mode) {
1377   // Set up default values for all flags.
1378   // If you add a flag to any of the branches below,
1379   // add a default value for it here.
1380   set_java_compiler(false);
1381   _mode                      = mode;
1382 
1383   // Ensure Agent_OnLoad has the correct initial values.
1384   // This may not be the final mode; mode may change later in onload phase.
1385   PropertyList_unique_add(&_system_properties, "java.vm.info",
1386                           VM_Version::vm_info_string(), false);
1387 
1388   UseInterpreter             = true;
1389   UseCompiler                = true;
1390   UseLoopCounter             = true;
1391 
1392   // Default values may be platform/compiler dependent -
1393   // use the saved values
1394   ClipInlining               = Arguments::_ClipInlining;
1395   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1396   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1397   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1398   if (TieredCompilation) {
1399     if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1400       Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1401     }
1402     if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1403       Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1404     }
1405   }
1406 
1407   // Change from defaults based on mode
1408   switch (mode) {
1409   default:
1410     ShouldNotReachHere();
1411     break;
1412   case _int:
1413     UseCompiler              = false;
1414     UseLoopCounter           = false;
1415     AlwaysCompileLoopMethods = false;
1416     UseOnStackReplacement    = false;
1417     break;
1418   case _mixed:
1419     // same as default
1420     break;
1421   case _comp:
1422     UseInterpreter           = false;
1423     BackgroundCompilation    = false;
1424     ClipInlining             = false;
1425     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1426     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1427     // compile a level 4 (C2) and then continue executing it.
1428     if (TieredCompilation) {
1429       Tier3InvokeNotifyFreqLog = 0;
1430       Tier4InvocationThreshold = 0;
1431     }
1432     break;
1433   }
1434 }
1435 
1436 #if defined(COMPILER2) || INCLUDE_JVMCI || defined(_LP64) || !INCLUDE_CDS
1437 // Conflict: required to use shared spaces (-Xshare:on), but
1438 // incompatible command line options were chosen.
1439 
1440 static void no_shared_spaces(const char* message) {
1441   if (RequireSharedSpaces) {
1442     jio_fprintf(defaultStream::error_stream(),
1443       "Class data sharing is inconsistent with other specified options.\n");
1444     vm_exit_during_initialization("Unable to use shared archive.", message);
1445   } else {
1446     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1447   }
1448 }
1449 #endif
1450 
1451 // Returns threshold scaled with the value of scale.
1452 // If scale < 0.0, threshold is returned without scaling.
1453 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1454   if (scale == 1.0 || scale < 0.0) {
1455     return threshold;
1456   } else {
1457     return (intx)(threshold * scale);
1458   }
1459 }
1460 
1461 // Returns freq_log scaled with the value of scale.
1462 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1463 // If scale < 0.0, freq_log is returned without scaling.
1464 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1465   // Check if scaling is necessary or if negative value was specified.
1466   if (scale == 1.0 || scale < 0.0) {
1467     return freq_log;
1468   }
1469   // Check values to avoid calculating log2 of 0.
1470   if (scale == 0.0 || freq_log == 0) {
1471     return 0;
1472   }
1473   // Determine the maximum notification frequency value currently supported.
1474   // The largest mask value that the interpreter/C1 can handle is
1475   // of length InvocationCounter::number_of_count_bits. Mask values are always
1476   // one bit shorter then the value of the notification frequency. Set
1477   // max_freq_bits accordingly.
1478   intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1479   intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1480   if (scaled_freq == 0) {
1481     // Return 0 right away to avoid calculating log2 of 0.
1482     return 0;
1483   } else if (scaled_freq > nth_bit(max_freq_bits)) {
1484     return max_freq_bits;
1485   } else {
1486     return log2_intptr(scaled_freq);
1487   }
1488 }
1489 
1490 void Arguments::set_tiered_flags() {
1491   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1492   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1493     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1494   }
1495   if (CompilationPolicyChoice < 2) {
1496     vm_exit_during_initialization(
1497       "Incompatible compilation policy selected", NULL);
1498   }
1499   // Increase the code cache size - tiered compiles a lot more.
1500   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1501     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1502                   MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1503   }
1504   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1505   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1506     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1507   }
1508   if (!UseInterpreter) { // -Xcomp
1509     Tier3InvokeNotifyFreqLog = 0;
1510     Tier4InvocationThreshold = 0;
1511   }
1512 
1513   if (CompileThresholdScaling < 0) {
1514     vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1515   }
1516 
1517   // Scale tiered compilation thresholds.
1518   // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1519   if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1520     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1521     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1522 
1523     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1524     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1525     FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1526     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1527 
1528     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1529     // once these thresholds become supported.
1530 
1531     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1532     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1533 
1534     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1535     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1536 
1537     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1538 
1539     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1540     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1541     FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1542     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1543   }
1544 }
1545 
1546 #if INCLUDE_ALL_GCS
1547 static void disable_adaptive_size_policy(const char* collector_name) {
1548   if (UseAdaptiveSizePolicy) {
1549     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1550       warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1551               collector_name);
1552     }
1553     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1554   }
1555 }
1556 
1557 void Arguments::set_parnew_gc_flags() {
1558   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1559          "control point invariant");
1560   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1561   assert(UseParNewGC, "ParNew should always be used with CMS");
1562 
1563   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1564     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1565     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1566   } else if (ParallelGCThreads == 0) {
1567     jio_fprintf(defaultStream::error_stream(),
1568         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1569     vm_exit(1);
1570   }
1571 
1572   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1573   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1574   // we set them to 1024 and 1024.
1575   // See CR 6362902.
1576   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1577     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1578   }
1579   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1580     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1581   }
1582 
1583   // When using compressed oops, we use local overflow stacks,
1584   // rather than using a global overflow list chained through
1585   // the klass word of the object's pre-image.
1586   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1587     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1588       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1589     }
1590     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1591   }
1592   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1593 }
1594 
1595 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1596 // sparc/solaris for certain applications, but would gain from
1597 // further optimization and tuning efforts, and would almost
1598 // certainly gain from analysis of platform and environment.
1599 void Arguments::set_cms_and_parnew_gc_flags() {
1600   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1601   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1602   assert(UseParNewGC, "ParNew should always be used with CMS");
1603 
1604   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1605   disable_adaptive_size_policy("UseConcMarkSweepGC");
1606 
1607   set_parnew_gc_flags();
1608 
1609   size_t max_heap = align_size_down(MaxHeapSize,
1610                                     CardTableRS::ct_max_alignment_constraint());
1611 
1612   // Now make adjustments for CMS
1613   intx   tenuring_default = (intx)6;
1614   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1615 
1616   // Preferred young gen size for "short" pauses:
1617   // upper bound depends on # of threads and NewRatio.
1618   const size_t preferred_max_new_size_unaligned =
1619     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1620   size_t preferred_max_new_size =
1621     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1622 
1623   // Unless explicitly requested otherwise, size young gen
1624   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1625 
1626   // If either MaxNewSize or NewRatio is set on the command line,
1627   // assume the user is trying to set the size of the young gen.
1628   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1629 
1630     // Set MaxNewSize to our calculated preferred_max_new_size unless
1631     // NewSize was set on the command line and it is larger than
1632     // preferred_max_new_size.
1633     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1634       FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1635     } else {
1636       FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1637     }
1638     log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1639 
1640     // Code along this path potentially sets NewSize and OldSize
1641     log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size:  " SIZE_FORMAT " max_heap: " SIZE_FORMAT,
1642                         min_heap_size(), InitialHeapSize, max_heap);
1643     size_t min_new = preferred_max_new_size;
1644     if (FLAG_IS_CMDLINE(NewSize)) {
1645       min_new = NewSize;
1646     }
1647     if (max_heap > min_new && min_heap_size() > min_new) {
1648       // Unless explicitly requested otherwise, make young gen
1649       // at least min_new, and at most preferred_max_new_size.
1650       if (FLAG_IS_DEFAULT(NewSize)) {
1651         FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1652         FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1653         log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1654       }
1655       // Unless explicitly requested otherwise, size old gen
1656       // so it's NewRatio x of NewSize.
1657       if (FLAG_IS_DEFAULT(OldSize)) {
1658         if (max_heap > NewSize) {
1659           FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1660           log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1661         }
1662       }
1663     }
1664   }
1665   // Unless explicitly requested otherwise, definitely
1666   // promote all objects surviving "tenuring_default" scavenges.
1667   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1668       FLAG_IS_DEFAULT(SurvivorRatio)) {
1669     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1670   }
1671   // If we decided above (or user explicitly requested)
1672   // `promote all' (via MaxTenuringThreshold := 0),
1673   // prefer minuscule survivor spaces so as not to waste
1674   // space for (non-existent) survivors
1675   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1676     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1677   }
1678 
1679   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1680   // but rather the number of free blocks of a given size that are used when
1681   // replenishing the local per-worker free list caches.
1682   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1683     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1684       // OldPLAB sizing manually turned off: Use a larger default setting,
1685       // unless it was manually specified. This is because a too-low value
1686       // will slow down scavenges.
1687       FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166
1688     } else {
1689       FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1690     }
1691   }
1692 
1693   // If either of the static initialization defaults have changed, note this
1694   // modification.
1695   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1696     CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight);
1697   }
1698 
1699   if (!ClassUnloading) {
1700     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1701     FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1702   }
1703 
1704   log_trace(gc)("MarkStackSize: %uk  MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1705   log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1706 }
1707 #endif // INCLUDE_ALL_GCS
1708 
1709 void set_object_alignment() {
1710   // Object alignment.
1711   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1712   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1713   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1714   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1715   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1716   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1717 
1718   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1719   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1720 
1721   // Oop encoding heap max
1722   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1723 
1724   if (SurvivorAlignmentInBytes == 0) {
1725     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1726   }
1727 
1728 #if INCLUDE_ALL_GCS
1729   // Set CMS global values
1730   CompactibleFreeListSpace::set_cms_values();
1731 #endif // INCLUDE_ALL_GCS
1732 }
1733 
1734 size_t Arguments::max_heap_for_compressed_oops() {
1735   // Avoid sign flip.
1736   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1737   // We need to fit both the NULL page and the heap into the memory budget, while
1738   // keeping alignment constraints of the heap. To guarantee the latter, as the
1739   // NULL page is located before the heap, we pad the NULL page to the conservative
1740   // maximum alignment that the GC may ever impose upon the heap.
1741   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1742                                                         _conservative_max_heap_alignment);
1743 
1744   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1745   NOT_LP64(ShouldNotReachHere(); return 0);
1746 }
1747 
1748 bool Arguments::should_auto_select_low_pause_collector() {
1749   if (UseAutoGCSelectPolicy &&
1750       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1751       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1752     log_trace(gc)("Automatic selection of the low pause collector based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1753     return true;
1754   }
1755   return false;
1756 }
1757 
1758 void Arguments::set_use_compressed_oops() {
1759 #ifndef ZERO
1760 #ifdef _LP64
1761   // MaxHeapSize is not set up properly at this point, but
1762   // the only value that can override MaxHeapSize if we are
1763   // to use UseCompressedOops is InitialHeapSize.
1764   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1765 
1766   if (max_heap_size <= max_heap_for_compressed_oops()) {
1767 #if !defined(COMPILER1) || defined(TIERED)
1768     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1769       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1770     }
1771 #endif
1772   } else {
1773     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1774       warning("Max heap size too large for Compressed Oops");
1775       FLAG_SET_DEFAULT(UseCompressedOops, false);
1776       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1777     }
1778   }
1779 #endif // _LP64
1780 #endif // ZERO
1781 }
1782 
1783 
1784 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1785 // set_use_compressed_oops().
1786 void Arguments::set_use_compressed_klass_ptrs() {
1787 #ifndef ZERO
1788 #ifdef _LP64
1789   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1790   if (!UseCompressedOops) {
1791     if (UseCompressedClassPointers) {
1792       warning("UseCompressedClassPointers requires UseCompressedOops");
1793     }
1794     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1795   } else {
1796     // Turn on UseCompressedClassPointers too
1797     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1798       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1799     }
1800     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1801     if (UseCompressedClassPointers) {
1802       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1803         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1804         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1805       }
1806     }
1807   }
1808 #endif // _LP64
1809 #endif // !ZERO
1810 }
1811 
1812 void Arguments::set_conservative_max_heap_alignment() {
1813   // The conservative maximum required alignment for the heap is the maximum of
1814   // the alignments imposed by several sources: any requirements from the heap
1815   // itself, the collector policy and the maximum page size we may run the VM
1816   // with.
1817   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1818 #if INCLUDE_ALL_GCS
1819   if (UseParallelGC) {
1820     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1821   } else if (UseG1GC) {
1822     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1823   }
1824 #endif // INCLUDE_ALL_GCS
1825   _conservative_max_heap_alignment = MAX4(heap_alignment,
1826                                           (size_t)os::vm_allocation_granularity(),
1827                                           os::max_page_size(),
1828                                           CollectorPolicy::compute_heap_alignment());
1829 }
1830 
1831 void Arguments::select_gc_ergonomically() {
1832   if (os::is_server_class_machine()) {
1833     if (should_auto_select_low_pause_collector()) {
1834       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1835     } else {
1836 #if defined(JAVASE_EMBEDDED)
1837       FLAG_SET_ERGO(bool, UseParallelGC, true);
1838 #else
1839       FLAG_SET_ERGO(bool, UseG1GC, true);
1840 #endif
1841     }
1842   } else {
1843     FLAG_SET_ERGO(bool, UseSerialGC, true);
1844   }
1845 }
1846 
1847 void Arguments::select_gc() {
1848   if (!gc_selected()) {
1849     select_gc_ergonomically();
1850     guarantee(gc_selected(), "No GC selected");
1851   }
1852 }
1853 
1854 void Arguments::set_ergonomics_flags() {
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 (!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   CodeCacheExtensions::set_ergonomics_flags();
1885 }
1886 
1887 void Arguments::set_parallel_gc_flags() {
1888   assert(UseParallelGC || UseParallelOldGC, "Error");
1889   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1890   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1891     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1892   }
1893   FLAG_SET_DEFAULT(UseParallelGC, true);
1894 
1895   // If no heap maximum was requested explicitly, use some reasonable fraction
1896   // of the physical memory, up to a maximum of 1GB.
1897   FLAG_SET_DEFAULT(ParallelGCThreads,
1898                    Abstract_VM_Version::parallel_worker_threads());
1899   if (ParallelGCThreads == 0) {
1900     jio_fprintf(defaultStream::error_stream(),
1901         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1902     vm_exit(1);
1903   }
1904 
1905   if (UseAdaptiveSizePolicy) {
1906     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1907     // unless the user actually sets these flags.
1908     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1909       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1910     }
1911     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1912       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1913     }
1914   }
1915 
1916   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1917   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1918   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1919   // See CR 6362902 for details.
1920   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1921     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1922        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1923     }
1924     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1925       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1926     }
1927   }
1928 
1929   if (UseParallelOldGC) {
1930     // Par compact uses lower default values since they are treated as
1931     // minimums.  These are different defaults because of the different
1932     // interpretation and are not ergonomically set.
1933     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1934       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1935     }
1936   }
1937 }
1938 
1939 void Arguments::set_g1_gc_flags() {
1940   assert(UseG1GC, "Error");
1941 #if defined(COMPILER1) || INCLUDE_JVMCI
1942   FastTLABRefill = false;
1943 #endif
1944   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1945   if (ParallelGCThreads == 0) {
1946     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1947     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1948   }
1949 
1950 #if INCLUDE_ALL_GCS
1951   if (G1ConcRefinementThreads == 0) {
1952     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1953   }
1954 #endif
1955 
1956   // MarkStackSize will be set (if it hasn't been set by the user)
1957   // when concurrent marking is initialized.
1958   // Its value will be based upon the number of parallel marking threads.
1959   // But we do set the maximum mark stack size here.
1960   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1961     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1962   }
1963 
1964   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1965     // In G1, we want the default GC overhead goal to be higher than
1966     // it is for PS, or the heap might be expanded too aggressively.
1967     // We set it here to ~8%.
1968     FLAG_SET_DEFAULT(GCTimeRatio, 12);
1969   }
1970 
1971   log_trace(gc)("MarkStackSize: %uk  MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1972   log_trace(gc)("ConcGCThreads: %u", ConcGCThreads);
1973 }
1974 
1975 #if !INCLUDE_ALL_GCS
1976 #ifdef ASSERT
1977 static bool verify_serial_gc_flags() {
1978   return (UseSerialGC &&
1979         !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1980           UseParallelGC || UseParallelOldGC));
1981 }
1982 #endif // ASSERT
1983 #endif // INCLUDE_ALL_GCS
1984 
1985 void Arguments::set_gc_specific_flags() {
1986 #if INCLUDE_ALL_GCS
1987   // Set per-collector flags
1988   if (UseParallelGC || UseParallelOldGC) {
1989     set_parallel_gc_flags();
1990   } else if (UseConcMarkSweepGC) {
1991     set_cms_and_parnew_gc_flags();
1992   } else if (UseG1GC) {
1993     set_g1_gc_flags();
1994   }
1995   if (AssumeMP && !UseSerialGC) {
1996     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1997       warning("If the number of processors is expected to increase from one, then"
1998               " you should configure the number of parallel GC threads appropriately"
1999               " using -XX:ParallelGCThreads=N");
2000     }
2001   }
2002   if (MinHeapFreeRatio == 100) {
2003     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2004     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
2005   }
2006 #else // INCLUDE_ALL_GCS
2007   assert(verify_serial_gc_flags(), "SerialGC unset");
2008 #endif // INCLUDE_ALL_GCS
2009 }
2010 
2011 julong Arguments::limit_by_allocatable_memory(julong limit) {
2012   julong max_allocatable;
2013   julong result = limit;
2014   if (os::has_allocatable_memory_limit(&max_allocatable)) {
2015     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
2016   }
2017   return result;
2018 }
2019 
2020 // Use static initialization to get the default before parsing
2021 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
2022 
2023 void Arguments::set_heap_size() {
2024   const julong phys_mem =
2025     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
2026                             : (julong)MaxRAM;
2027 
2028   // If the maximum heap size has not been set with -Xmx,
2029   // then set it as fraction of the size of physical memory,
2030   // respecting the maximum and minimum sizes of the heap.
2031   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2032     julong reasonable_max = phys_mem / MaxRAMFraction;
2033 
2034     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
2035       // Small physical memory, so use a minimum fraction of it for the heap
2036       reasonable_max = phys_mem / MinRAMFraction;
2037     } else {
2038       // Not-small physical memory, so require a heap at least
2039       // as large as MaxHeapSize
2040       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2041     }
2042     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2043       // Limit the heap size to ErgoHeapSizeLimit
2044       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2045     }
2046     if (UseCompressedOops) {
2047       // Limit the heap size to the maximum possible when using compressed oops
2048       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2049 
2050       // HeapBaseMinAddress can be greater than default but not less than.
2051       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
2052         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
2053           // matches compressed oops printing flags
2054           if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
2055             jio_fprintf(defaultStream::error_stream(),
2056                         "HeapBaseMinAddress must be at least " SIZE_FORMAT
2057                         " (" SIZE_FORMAT "G) which is greater than value given "
2058                         SIZE_FORMAT "\n",
2059                         DefaultHeapBaseMinAddress,
2060                         DefaultHeapBaseMinAddress/G,
2061                         HeapBaseMinAddress);
2062           }
2063           FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
2064         }
2065       }
2066 
2067       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2068         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2069         // but it should be not less than default MaxHeapSize.
2070         max_coop_heap -= HeapBaseMinAddress;
2071       }
2072       reasonable_max = MIN2(reasonable_max, max_coop_heap);
2073     }
2074     reasonable_max = limit_by_allocatable_memory(reasonable_max);
2075 
2076     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2077       // An initial heap size was specified on the command line,
2078       // so be sure that the maximum size is consistent.  Done
2079       // after call to limit_by_allocatable_memory because that
2080       // method might reduce the allocation size.
2081       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2082     }
2083 
2084     log_trace(gc, heap)("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2085     FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
2086   }
2087 
2088   // If the minimum or initial heap_size have not been set or requested to be set
2089   // ergonomically, set them accordingly.
2090   if (InitialHeapSize == 0 || min_heap_size() == 0) {
2091     julong reasonable_minimum = (julong)(OldSize + NewSize);
2092 
2093     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2094 
2095     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2096 
2097     if (InitialHeapSize == 0) {
2098       julong reasonable_initial = phys_mem / InitialRAMFraction;
2099 
2100       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2101       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2102 
2103       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2104 
2105       log_trace(gc, heap)("  Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
2106       FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
2107     }
2108     // If the minimum heap size has not been set (via -Xms),
2109     // synchronize with InitialHeapSize to avoid errors with the default value.
2110     if (min_heap_size() == 0) {
2111       set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
2112       log_trace(gc, heap)("  Minimum heap size " SIZE_FORMAT, min_heap_size());
2113     }
2114   }
2115 }
2116 
2117 // This option inspects the machine and attempts to set various
2118 // parameters to be optimal for long-running, memory allocation
2119 // intensive jobs.  It is intended for machines with large
2120 // amounts of cpu and memory.
2121 jint Arguments::set_aggressive_heap_flags() {
2122   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2123   // VM, but we may not be able to represent the total physical memory
2124   // available (like having 8gb of memory on a box but using a 32bit VM).
2125   // Thus, we need to make sure we're using a julong for intermediate
2126   // calculations.
2127   julong initHeapSize;
2128   julong total_memory = os::physical_memory();
2129 
2130   if (total_memory < (julong) 256 * M) {
2131     jio_fprintf(defaultStream::error_stream(),
2132             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2133     vm_exit(1);
2134   }
2135 
2136   // The heap size is half of available memory, or (at most)
2137   // all of possible memory less 160mb (leaving room for the OS
2138   // when using ISM).  This is the maximum; because adaptive sizing
2139   // is turned on below, the actual space used may be smaller.
2140 
2141   initHeapSize = MIN2(total_memory / (julong) 2,
2142           total_memory - (julong) 160 * M);
2143 
2144   initHeapSize = limit_by_allocatable_memory(initHeapSize);
2145 
2146   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2147     if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2148       return JNI_EINVAL;
2149     }
2150     if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2151       return JNI_EINVAL;
2152     }
2153     // Currently the minimum size and the initial heap sizes are the same.
2154     set_min_heap_size(initHeapSize);
2155   }
2156   if (FLAG_IS_DEFAULT(NewSize)) {
2157     // Make the young generation 3/8ths of the total heap.
2158     if (FLAG_SET_CMDLINE(size_t, NewSize,
2159             ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2160       return JNI_EINVAL;
2161     }
2162     if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2163       return JNI_EINVAL;
2164     }
2165   }
2166 
2167 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
2168   FLAG_SET_DEFAULT(UseLargePages, true);
2169 #endif
2170 
2171   // Increase some data structure sizes for efficiency
2172   if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2173     return JNI_EINVAL;
2174   }
2175   if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2176     return JNI_EINVAL;
2177   }
2178   if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2179     return JNI_EINVAL;
2180   }
2181 
2182   // See the OldPLABSize comment below, but replace 'after promotion'
2183   // with 'after copying'.  YoungPLABSize is the size of the survivor
2184   // space per-gc-thread buffers.  The default is 4kw.
2185   if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2186     return JNI_EINVAL;
2187   }
2188 
2189   // OldPLABSize is the size of the buffers in the old gen that
2190   // UseParallelGC uses to promote live data that doesn't fit in the
2191   // survivor spaces.  At any given time, there's one for each gc thread.
2192   // The default size is 1kw. These buffers are rarely used, since the
2193   // survivor spaces are usually big enough.  For specjbb, however, there
2194   // are occasions when there's lots of live data in the young gen
2195   // and we end up promoting some of it.  We don't have a definite
2196   // explanation for why bumping OldPLABSize helps, but the theory
2197   // is that a bigger PLAB results in retaining something like the
2198   // original allocation order after promotion, which improves mutator
2199   // locality.  A minor effect may be that larger PLABs reduce the
2200   // number of PLAB allocation events during gc.  The value of 8kw
2201   // was arrived at by experimenting with specjbb.
2202   if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2203     return JNI_EINVAL;
2204   }
2205 
2206   // Enable parallel GC and adaptive generation sizing
2207   if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2208     return JNI_EINVAL;
2209   }
2210   FLAG_SET_DEFAULT(ParallelGCThreads,
2211           Abstract_VM_Version::parallel_worker_threads());
2212 
2213   // Encourage steady state memory management
2214   if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2215     return JNI_EINVAL;
2216   }
2217 
2218   // This appears to improve mutator locality
2219   if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2220     return JNI_EINVAL;
2221   }
2222 
2223   // Get around early Solaris scheduling bug
2224   // (affinity vs other jobs on system)
2225   // but disallow DR and offlining (5008695).
2226   if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2227     return JNI_EINVAL;
2228   }
2229 
2230   return JNI_OK;
2231 }
2232 
2233 // This must be called after ergonomics.
2234 void Arguments::set_bytecode_flags() {
2235   if (!RewriteBytecodes) {
2236     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2237   }
2238 }
2239 
2240 // Aggressive optimization flags  -XX:+AggressiveOpts
2241 jint Arguments::set_aggressive_opts_flags() {
2242 #ifdef COMPILER2
2243   if (AggressiveUnboxing) {
2244     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2245       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2246     } else if (!EliminateAutoBox) {
2247       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2248       AggressiveUnboxing = false;
2249     }
2250     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2251       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2252     } else if (!DoEscapeAnalysis) {
2253       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2254       AggressiveUnboxing = false;
2255     }
2256   }
2257   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2258     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2259       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2260     }
2261     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2262       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2263     }
2264 
2265     // Feed the cache size setting into the JDK
2266     char buffer[1024];
2267     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2268     if (!add_property(buffer)) {
2269       return JNI_ENOMEM;
2270     }
2271   }
2272   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2273     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2274   }
2275 #endif
2276 
2277   if (AggressiveOpts) {
2278 // Sample flag setting code
2279 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2280 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
2281 //    }
2282   }
2283 
2284   return JNI_OK;
2285 }
2286 
2287 //===========================================================================================================
2288 // Parsing of java.compiler property
2289 
2290 void Arguments::process_java_compiler_argument(const char* arg) {
2291   // For backwards compatibility, Djava.compiler=NONE or ""
2292   // causes us to switch to -Xint mode UNLESS -Xdebug
2293   // is also specified.
2294   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2295     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2296   }
2297 }
2298 
2299 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2300   _sun_java_launcher = os::strdup_check_oom(launcher);
2301 }
2302 
2303 bool Arguments::created_by_java_launcher() {
2304   assert(_sun_java_launcher != NULL, "property must have value");
2305   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2306 }
2307 
2308 bool Arguments::sun_java_launcher_is_altjvm() {
2309   return _sun_java_launcher_is_altjvm;
2310 }
2311 
2312 //===========================================================================================================
2313 // Parsing of main arguments
2314 
2315 #if INCLUDE_JVMCI
2316 
2317 // Check consistency of jvmci vm argument settings.
2318 bool Arguments::check_jvmci_args_consistency() {
2319  
2320 
2321   if (!EnableJVMCI && is_any_jvmci_arg_values_changed()) { 
2322     print_jvmci_arg_inconsistency_error_message(); 
2323     return false;
2324   }
2325   return true;
2326 }
2327 #endif //INCLUDE_JVMCI
2328 
2329 // Check consistency of GC selection
2330 bool Arguments::check_gc_consistency() {
2331   // Ensure that the user has not selected conflicting sets
2332   // of collectors.
2333   uint i = 0;
2334   if (UseSerialGC)                       i++;
2335   if (UseConcMarkSweepGC)                i++;
2336   if (UseParallelGC || UseParallelOldGC) i++;
2337   if (UseG1GC)                           i++;
2338   if (i > 1) {
2339     jio_fprintf(defaultStream::error_stream(),
2340                 "Conflicting collector combinations in option list; "
2341                 "please refer to the release notes for the combinations "
2342                 "allowed\n");
2343     return false;
2344   }
2345 
2346   if (UseConcMarkSweepGC && !UseParNewGC) {
2347     jio_fprintf(defaultStream::error_stream(),
2348         "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2349     return false;
2350   }
2351 
2352   if (UseParNewGC && !UseConcMarkSweepGC) {
2353     jio_fprintf(defaultStream::error_stream(),
2354         "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2355     return false;
2356   }
2357 
2358   return true;
2359 }
2360 
2361 // Check the consistency of vm_init_args
2362 bool Arguments::check_vm_args_consistency() {
2363   // Method for adding checks for flag consistency.
2364   // The intent is to warn the user of all possible conflicts,
2365   // before returning an error.
2366   // Note: Needs platform-dependent factoring.
2367   bool status = true;
2368 
2369   if (TLABRefillWasteFraction == 0) {
2370     jio_fprintf(defaultStream::error_stream(),
2371                 "TLABRefillWasteFraction should be a denominator, "
2372                 "not " SIZE_FORMAT "\n",
2373                 TLABRefillWasteFraction);
2374     status = false;
2375   }
2376 
2377   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2378     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2379   }
2380 
2381   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2382     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2383   }
2384 
2385   if (GCTimeLimit == 100) {
2386     // Turn off gc-overhead-limit-exceeded checks
2387     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2388   }
2389 
2390   status = status && check_gc_consistency();
2391 
2392   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2393   // insists that we hold the requisite locks so that the iteration is
2394   // MT-safe. For the verification at start-up and shut-down, we don't
2395   // yet have a good way of acquiring and releasing these locks,
2396   // which are not visible at the CollectedHeap level. We want to
2397   // be able to acquire these locks and then do the iteration rather
2398   // than just disable the lock verification. This will be fixed under
2399   // bug 4788986.
2400   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2401     if (VerifyDuringStartup) {
2402       warning("Heap verification at start-up disabled "
2403               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2404       VerifyDuringStartup = false; // Disable verification at start-up
2405     }
2406 
2407     if (VerifyBeforeExit) {
2408       warning("Heap verification at shutdown disabled "
2409               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2410       VerifyBeforeExit = false; // Disable verification at shutdown
2411     }
2412   }
2413 
2414   if (PrintNMTStatistics) {
2415 #if INCLUDE_NMT
2416     if (MemTracker::tracking_level() == NMT_off) {
2417 #endif // INCLUDE_NMT
2418       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2419       PrintNMTStatistics = false;
2420 #if INCLUDE_NMT
2421     }
2422 #endif
2423   }
2424 #if INCLUDE_JVMCI
2425 
2426   status = status && check_jvmci_args_consistency();
2427 
2428   if (EnableJVMCI) {
2429     if (!ScavengeRootsInCode) {
2430       warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled");
2431       ScavengeRootsInCode = 1;
2432     }
2433     if (FLAG_IS_DEFAULT(TypeProfileLevel)) {
2434       TypeProfileLevel = 0;
2435     }
2436     if (UseJVMCICompiler) {
2437       if (FLAG_IS_DEFAULT(TypeProfileWidth)) {
2438         TypeProfileWidth = 8;
2439       }
2440     }
2441   }
2442 #endif
2443 
2444   // Check lower bounds of the code cache
2445   // Template Interpreter code is approximately 3X larger in debug builds.
2446   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2447   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2448     jio_fprintf(defaultStream::error_stream(),
2449                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2450                 os::vm_page_size()/K);
2451     status = false;
2452   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2453     jio_fprintf(defaultStream::error_stream(),
2454                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2455                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2456     status = false;
2457   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2458     jio_fprintf(defaultStream::error_stream(),
2459                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2460                 min_code_cache_size/K);
2461     status = false;
2462   } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2463     // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2464     jio_fprintf(defaultStream::error_stream(),
2465                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2466                 CODE_CACHE_SIZE_LIMIT/M);
2467     status = false;
2468   } else if (NonNMethodCodeHeapSize < min_code_cache_size) {
2469     jio_fprintf(defaultStream::error_stream(),
2470                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2471                 min_code_cache_size/K);
2472     status = false;
2473   }
2474 
2475   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2476     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2477   }
2478 
2479 #ifndef SUPPORT_RESERVED_STACK_AREA
2480   if (StackReservedPages != 0) {
2481     FLAG_SET_CMDLINE(intx, StackReservedPages, 0);
2482     warning("Reserved Stack Area not supported on this platform");
2483   }
2484 #endif
2485   return status;
2486 }
2487 
2488 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2489   const char* option_type) {
2490   if (ignore) return false;
2491 
2492   const char* spacer = " ";
2493   if (option_type == NULL) {
2494     option_type = ++spacer; // Set both to the empty string.
2495   }
2496 
2497   if (os::obsolete_option(option)) {
2498     jio_fprintf(defaultStream::error_stream(),
2499                 "Obsolete %s%soption: %s\n", option_type, spacer,
2500       option->optionString);
2501     return false;
2502   } else {
2503     jio_fprintf(defaultStream::error_stream(),
2504                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2505       option->optionString);
2506     return true;
2507   }
2508 }
2509 
2510 static const char* user_assertion_options[] = {
2511   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2512 };
2513 
2514 static const char* system_assertion_options[] = {
2515   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2516 };
2517 
2518 bool Arguments::parse_uintx(const char* value,
2519                             uintx* uintx_arg,
2520                             uintx min_size) {
2521 
2522   // Check the sign first since atomull() parses only unsigned values.
2523   bool value_is_positive = !(*value == '-');
2524 
2525   if (value_is_positive) {
2526     julong n;
2527     bool good_return = atomull(value, &n);
2528     if (good_return) {
2529       bool above_minimum = n >= min_size;
2530       bool value_is_too_large = n > max_uintx;
2531 
2532       if (above_minimum && !value_is_too_large) {
2533         *uintx_arg = n;
2534         return true;
2535       }
2536     }
2537   }
2538   return false;
2539 }
2540 
2541 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2542                                                   julong* long_arg,
2543                                                   julong min_size) {
2544   if (!atomull(s, long_arg)) return arg_unreadable;
2545   return check_memory_size(*long_arg, min_size);
2546 }
2547 
2548 // Parse JavaVMInitArgs structure
2549 
2550 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2551                                    const JavaVMInitArgs *java_options_args,
2552                                    const JavaVMInitArgs *cmd_line_args) {
2553   // For components of the system classpath.
2554   SysClassPath scp(Arguments::get_sysclasspath());
2555   bool scp_assembly_required = false;
2556 
2557   // Save default settings for some mode flags
2558   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2559   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2560   Arguments::_ClipInlining             = ClipInlining;
2561   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2562   if (TieredCompilation) {
2563     Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2564     Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2565   }
2566 
2567   // Setup flags for mixed which is the default
2568   set_mode_flags(_mixed);
2569 
2570   // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2571   // variable (if present).
2572   jint result = parse_each_vm_init_arg(
2573       java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2574   if (result != JNI_OK) {
2575     return result;
2576   }
2577 
2578   // Parse args structure generated from the command line flags.
2579   result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2580                                   Flag::COMMAND_LINE);
2581   if (result != JNI_OK) {
2582     return result;
2583   }
2584 
2585   // Parse args structure generated from the _JAVA_OPTIONS environment
2586   // variable (if present) (mimics classic VM)
2587   result = parse_each_vm_init_arg(
2588       java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2589   if (result != JNI_OK) {
2590     return result;
2591   }
2592 
2593   // Do final processing now that all arguments have been parsed
2594   result = finalize_vm_init_args(&scp, scp_assembly_required);
2595   if (result != JNI_OK) {
2596     return result;
2597   }
2598 
2599   return JNI_OK;
2600 }
2601 
2602 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2603 // represents a valid JDWP agent.  is_path==true denotes that we
2604 // are dealing with -agentpath (case where name is a path), otherwise with
2605 // -agentlib
2606 bool valid_jdwp_agent(char *name, bool is_path) {
2607   char *_name;
2608   const char *_jdwp = "jdwp";
2609   size_t _len_jdwp, _len_prefix;
2610 
2611   if (is_path) {
2612     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2613       return false;
2614     }
2615 
2616     _name++;  // skip past last path separator
2617     _len_prefix = strlen(JNI_LIB_PREFIX);
2618 
2619     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2620       return false;
2621     }
2622 
2623     _name += _len_prefix;
2624     _len_jdwp = strlen(_jdwp);
2625 
2626     if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2627       _name += _len_jdwp;
2628     }
2629     else {
2630       return false;
2631     }
2632 
2633     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2634       return false;
2635     }
2636 
2637     return true;
2638   }
2639 
2640   if (strcmp(name, _jdwp) == 0) {
2641     return true;
2642   }
2643 
2644   return false;
2645 }
2646 
2647 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2648                                        SysClassPath* scp_p,
2649                                        bool* scp_assembly_required_p,
2650                                        Flag::Flags origin) {
2651   // For match_option to return remaining or value part of option string
2652   const char* tail;
2653 
2654   // iterate over arguments
2655   for (int index = 0; index < args->nOptions; index++) {
2656     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2657 
2658     const JavaVMOption* option = args->options + index;
2659 
2660     if (!match_option(option, "-Djava.class.path", &tail) &&
2661         !match_option(option, "-Dsun.java.command", &tail) &&
2662         !match_option(option, "-Dsun.java.launcher", &tail)) {
2663 
2664         // add all jvm options to the jvm_args string. This string
2665         // is used later to set the java.vm.args PerfData string constant.
2666         // the -Djava.class.path and the -Dsun.java.command options are
2667         // omitted from jvm_args string as each have their own PerfData
2668         // string constant object.
2669         build_jvm_args(option->optionString);
2670     }
2671 
2672     // -verbose:[class/gc/jni]
2673     if (match_option(option, "-verbose", &tail)) {
2674       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2675         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classload));
2676         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(classunload));
2677       } else if (!strcmp(tail, ":gc")) {
2678         LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2679       } else if (!strcmp(tail, ":jni")) {
2680         if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2681           return JNI_EINVAL;
2682         }
2683       }
2684     // -da / -ea / -disableassertions / -enableassertions
2685     // These accept an optional class/package name separated by a colon, e.g.,
2686     // -da:java.lang.Thread.
2687     } else if (match_option(option, user_assertion_options, &tail, true)) {
2688       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2689       if (*tail == '\0') {
2690         JavaAssertions::setUserClassDefault(enable);
2691       } else {
2692         assert(*tail == ':', "bogus match by match_option()");
2693         JavaAssertions::addOption(tail + 1, enable);
2694       }
2695     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2696     } else if (match_option(option, system_assertion_options, &tail, false)) {
2697       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2698       JavaAssertions::setSystemClassDefault(enable);
2699     // -bootclasspath:
2700     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2701       scp_p->reset_path(tail);
2702       *scp_assembly_required_p = true;
2703     // -bootclasspath/a:
2704     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2705       scp_p->add_suffix(tail);
2706       *scp_assembly_required_p = true;
2707     // -bootclasspath/p:
2708     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2709       scp_p->add_prefix(tail);
2710       *scp_assembly_required_p = true;
2711     // -Xrun
2712     } else if (match_option(option, "-Xrun", &tail)) {
2713       if (tail != NULL) {
2714         const char* pos = strchr(tail, ':');
2715         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2716         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2717         name[len] = '\0';
2718 
2719         char *options = NULL;
2720         if(pos != NULL) {
2721           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2722           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2723         }
2724 #if !INCLUDE_JVMTI
2725         if (strcmp(name, "jdwp") == 0) {
2726           jio_fprintf(defaultStream::error_stream(),
2727             "Debugging agents are not supported in this VM\n");
2728           return JNI_ERR;
2729         }
2730 #endif // !INCLUDE_JVMTI
2731         add_init_library(name, options);
2732       }
2733     // -agentlib and -agentpath
2734     } else if (match_option(option, "-agentlib:", &tail) ||
2735           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2736       if(tail != NULL) {
2737         const char* pos = strchr(tail, '=');
2738         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2739         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2740         name[len] = '\0';
2741 
2742         char *options = NULL;
2743         if(pos != NULL) {
2744           options = os::strdup_check_oom(pos + 1, mtInternal);
2745         }
2746 #if !INCLUDE_JVMTI
2747         if (valid_jdwp_agent(name, is_absolute_path)) {
2748           jio_fprintf(defaultStream::error_stream(),
2749             "Debugging agents are not supported in this VM\n");
2750           return JNI_ERR;
2751         }
2752 #endif // !INCLUDE_JVMTI
2753         add_init_agent(name, options, is_absolute_path);
2754       }
2755     // -javaagent
2756     } else if (match_option(option, "-javaagent:", &tail)) {
2757 #if !INCLUDE_JVMTI
2758       jio_fprintf(defaultStream::error_stream(),
2759         "Instrumentation agents are not supported in this VM\n");
2760       return JNI_ERR;
2761 #else
2762       if(tail != NULL) {
2763         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2764         add_init_agent("instrument", options, false);
2765       }
2766 #endif // !INCLUDE_JVMTI
2767     // -Xnoclassgc
2768     } else if (match_option(option, "-Xnoclassgc")) {
2769       if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2770         return JNI_EINVAL;
2771       }
2772     // -Xconcgc
2773     } else if (match_option(option, "-Xconcgc")) {
2774       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2775         return JNI_EINVAL;
2776       }
2777     // -Xnoconcgc
2778     } else if (match_option(option, "-Xnoconcgc")) {
2779       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2780         return JNI_EINVAL;
2781       }
2782     // -Xbatch
2783     } else if (match_option(option, "-Xbatch")) {
2784       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2785         return JNI_EINVAL;
2786       }
2787     // -Xmn for compatibility with other JVM vendors
2788     } else if (match_option(option, "-Xmn", &tail)) {
2789       julong long_initial_young_size = 0;
2790       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2791       if (errcode != arg_in_range) {
2792         jio_fprintf(defaultStream::error_stream(),
2793                     "Invalid initial young generation size: %s\n", option->optionString);
2794         describe_range_error(errcode);
2795         return JNI_EINVAL;
2796       }
2797       if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2798         return JNI_EINVAL;
2799       }
2800       if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2801         return JNI_EINVAL;
2802       }
2803     // -Xms
2804     } else if (match_option(option, "-Xms", &tail)) {
2805       julong long_initial_heap_size = 0;
2806       // an initial heap size of 0 means automatically determine
2807       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2808       if (errcode != arg_in_range) {
2809         jio_fprintf(defaultStream::error_stream(),
2810                     "Invalid initial heap size: %s\n", option->optionString);
2811         describe_range_error(errcode);
2812         return JNI_EINVAL;
2813       }
2814       set_min_heap_size((size_t)long_initial_heap_size);
2815       // Currently the minimum size and the initial heap sizes are the same.
2816       // Can be overridden with -XX:InitialHeapSize.
2817       if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2818         return JNI_EINVAL;
2819       }
2820     // -Xmx
2821     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2822       julong long_max_heap_size = 0;
2823       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2824       if (errcode != arg_in_range) {
2825         jio_fprintf(defaultStream::error_stream(),
2826                     "Invalid maximum heap size: %s\n", option->optionString);
2827         describe_range_error(errcode);
2828         return JNI_EINVAL;
2829       }
2830       if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2831         return JNI_EINVAL;
2832       }
2833     // Xmaxf
2834     } else if (match_option(option, "-Xmaxf", &tail)) {
2835       char* err;
2836       int maxf = (int)(strtod(tail, &err) * 100);
2837       if (*err != '\0' || *tail == '\0') {
2838         jio_fprintf(defaultStream::error_stream(),
2839                     "Bad max heap free percentage size: %s\n",
2840                     option->optionString);
2841         return JNI_EINVAL;
2842       } else {
2843         if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2844             return JNI_EINVAL;
2845         }
2846       }
2847     // Xminf
2848     } else if (match_option(option, "-Xminf", &tail)) {
2849       char* err;
2850       int minf = (int)(strtod(tail, &err) * 100);
2851       if (*err != '\0' || *tail == '\0') {
2852         jio_fprintf(defaultStream::error_stream(),
2853                     "Bad min heap free percentage size: %s\n",
2854                     option->optionString);
2855         return JNI_EINVAL;
2856       } else {
2857         if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2858           return JNI_EINVAL;
2859         }
2860       }
2861     // -Xss
2862     } else if (match_option(option, "-Xss", &tail)) {
2863       julong long_ThreadStackSize = 0;
2864       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2865       if (errcode != arg_in_range) {
2866         jio_fprintf(defaultStream::error_stream(),
2867                     "Invalid thread stack size: %s\n", option->optionString);
2868         describe_range_error(errcode);
2869         return JNI_EINVAL;
2870       }
2871       // Internally track ThreadStackSize in units of 1024 bytes.
2872       if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2873                        round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2874         return JNI_EINVAL;
2875       }
2876     // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs
2877     } else if (match_option(option, "-Xoss", &tail) ||
2878                match_option(option, "-Xsqnopause") ||
2879                match_option(option, "-Xoptimize") ||
2880                match_option(option, "-Xboundthreads") ||
2881                match_option(option, "-Xusealtsigs")) {
2882       // All these options are deprecated in JDK 9 and will be removed in a future release
2883       char version[256];
2884       JDK_Version::jdk(9).to_string(version, sizeof(version));
2885       warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2886     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2887       julong long_CodeCacheExpansionSize = 0;
2888       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2889       if (errcode != arg_in_range) {
2890         jio_fprintf(defaultStream::error_stream(),
2891                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2892                    os::vm_page_size()/K);
2893         return JNI_EINVAL;
2894       }
2895       if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2896         return JNI_EINVAL;
2897       }
2898     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2899                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2900       julong long_ReservedCodeCacheSize = 0;
2901 
2902       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2903       if (errcode != arg_in_range) {
2904         jio_fprintf(defaultStream::error_stream(),
2905                     "Invalid maximum code cache size: %s.\n", option->optionString);
2906         return JNI_EINVAL;
2907       }
2908       if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2909         return JNI_EINVAL;
2910       }
2911       // -XX:NonNMethodCodeHeapSize=
2912     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2913       julong long_NonNMethodCodeHeapSize = 0;
2914 
2915       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2916       if (errcode != arg_in_range) {
2917         jio_fprintf(defaultStream::error_stream(),
2918                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2919         return JNI_EINVAL;
2920       }
2921       if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2922         return JNI_EINVAL;
2923       }
2924       // -XX:ProfiledCodeHeapSize=
2925     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2926       julong long_ProfiledCodeHeapSize = 0;
2927 
2928       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2929       if (errcode != arg_in_range) {
2930         jio_fprintf(defaultStream::error_stream(),
2931                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2932         return JNI_EINVAL;
2933       }
2934       if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2935         return JNI_EINVAL;
2936       }
2937       // -XX:NonProfiledCodeHeapSizee=
2938     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2939       julong long_NonProfiledCodeHeapSize = 0;
2940 
2941       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2942       if (errcode != arg_in_range) {
2943         jio_fprintf(defaultStream::error_stream(),
2944                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2945         return JNI_EINVAL;
2946       }
2947       if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2948         return JNI_EINVAL;
2949       }
2950     // -green
2951     } else if (match_option(option, "-green")) {
2952       jio_fprintf(defaultStream::error_stream(),
2953                   "Green threads support not available\n");
2954           return JNI_EINVAL;
2955     // -native
2956     } else if (match_option(option, "-native")) {
2957           // HotSpot always uses native threads, ignore silently for compatibility
2958     // -Xrs
2959     } else if (match_option(option, "-Xrs")) {
2960           // Classic/EVM option, new functionality
2961       if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2962         return JNI_EINVAL;
2963       }
2964     // -Xprof
2965     } else if (match_option(option, "-Xprof")) {
2966 #if INCLUDE_FPROF
2967       _has_profile = true;
2968 #else // INCLUDE_FPROF
2969       jio_fprintf(defaultStream::error_stream(),
2970         "Flat profiling is not supported in this VM.\n");
2971       return JNI_ERR;
2972 #endif // INCLUDE_FPROF
2973     // -Xconcurrentio
2974     } else if (match_option(option, "-Xconcurrentio")) {
2975       if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2976         return JNI_EINVAL;
2977       }
2978       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2979         return JNI_EINVAL;
2980       }
2981       if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2982         return JNI_EINVAL;
2983       }
2984       if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2985         return JNI_EINVAL;
2986       }
2987       if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) {  // 20Kb per thread added to new generation
2988         return JNI_EINVAL;
2989       }
2990 
2991       // -Xinternalversion
2992     } else if (match_option(option, "-Xinternalversion")) {
2993       jio_fprintf(defaultStream::output_stream(), "%s\n",
2994                   VM_Version::internal_vm_info_string());
2995       vm_exit(0);
2996 #ifndef PRODUCT
2997     // -Xprintflags
2998     } else if (match_option(option, "-Xprintflags")) {
2999       CommandLineFlags::printFlags(tty, false);
3000       vm_exit(0);
3001 #endif
3002     // -D
3003     } else if (match_option(option, "-D", &tail)) {
3004       const char* value;
3005       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3006             *value!= '\0' && strcmp(value, "\"\"") != 0) {
3007         // abort if -Djava.endorsed.dirs is set
3008         jio_fprintf(defaultStream::output_stream(),
3009           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3010           "in modular form will be supported via the concept of upgradeable modules.\n", value);
3011         return JNI_EINVAL;
3012       }
3013       if (match_option(option, "-Djava.ext.dirs=", &value) &&
3014             *value != '\0' && strcmp(value, "\"\"") != 0) {
3015         // abort if -Djava.ext.dirs is set
3016         jio_fprintf(defaultStream::output_stream(),
3017           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
3018         return JNI_EINVAL;
3019       }
3020 
3021       if (!add_property(tail)) {
3022         return JNI_ENOMEM;
3023       }
3024       // Out of the box management support
3025       if (match_option(option, "-Dcom.sun.management", &tail)) {
3026 #if INCLUDE_MANAGEMENT
3027         if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
3028           return JNI_EINVAL;
3029         }
3030 #else
3031         jio_fprintf(defaultStream::output_stream(),
3032           "-Dcom.sun.management is not supported in this VM.\n");
3033         return JNI_ERR;
3034 #endif
3035       }
3036     // -Xint
3037     } else if (match_option(option, "-Xint")) {
3038           set_mode_flags(_int);
3039     // -Xmixed
3040     } else if (match_option(option, "-Xmixed")) {
3041           set_mode_flags(_mixed);
3042     // -Xcomp
3043     } else if (match_option(option, "-Xcomp")) {
3044       // for testing the compiler; turn off all flags that inhibit compilation
3045           set_mode_flags(_comp);
3046     // -Xshare:dump
3047     } else if (match_option(option, "-Xshare:dump")) {
3048       if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
3049         return JNI_EINVAL;
3050       }
3051       set_mode_flags(_int);     // Prevent compilation, which creates objects
3052     // -Xshare:on
3053     } else if (match_option(option, "-Xshare:on")) {
3054       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3055         return JNI_EINVAL;
3056       }
3057       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3058         return JNI_EINVAL;
3059       }
3060     // -Xshare:auto
3061     } else if (match_option(option, "-Xshare:auto")) {
3062       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3063         return JNI_EINVAL;
3064       }
3065       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3066         return JNI_EINVAL;
3067       }
3068     // -Xshare:off
3069     } else if (match_option(option, "-Xshare:off")) {
3070       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3071         return JNI_EINVAL;
3072       }
3073       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3074         return JNI_EINVAL;
3075       }
3076     // -Xverify
3077     } else if (match_option(option, "-Xverify", &tail)) {
3078       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3079         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3080           return JNI_EINVAL;
3081         }
3082         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3083           return JNI_EINVAL;
3084         }
3085       } else if (strcmp(tail, ":remote") == 0) {
3086         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3087           return JNI_EINVAL;
3088         }
3089         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3090           return JNI_EINVAL;
3091         }
3092       } else if (strcmp(tail, ":none") == 0) {
3093         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3094           return JNI_EINVAL;
3095         }
3096         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3097           return JNI_EINVAL;
3098         }
3099       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3100         return JNI_EINVAL;
3101       }
3102     // -Xdebug
3103     } else if (match_option(option, "-Xdebug")) {
3104       // note this flag has been used, then ignore
3105       set_xdebug_mode(true);
3106     // -Xnoagent
3107     } else if (match_option(option, "-Xnoagent")) {
3108       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3109     } else if (match_option(option, "-Xloggc:", &tail)) {
3110       // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
3111       log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
3112       _gc_log_filename = os::strdup_check_oom(tail);
3113     } else if (match_option(option, "-Xlog", &tail)) {
3114       bool ret = false;
3115       if (strcmp(tail, ":help") == 0) {
3116         LogConfiguration::print_command_line_help(defaultStream::output_stream());
3117         vm_exit(0);
3118       } else if (strcmp(tail, ":disable") == 0) {
3119         LogConfiguration::disable_logging();
3120         ret = true;
3121       } else if (*tail == '\0') {
3122         ret = LogConfiguration::parse_command_line_arguments();
3123         assert(ret, "-Xlog without arguments should never fail to parse");
3124       } else if (*tail == ':') {
3125         ret = LogConfiguration::parse_command_line_arguments(tail + 1);
3126       }
3127       if (ret == false) {
3128         jio_fprintf(defaultStream::error_stream(),
3129                     "Invalid -Xlog option '-Xlog%s'\n",
3130                     tail);
3131         return JNI_EINVAL;
3132       }
3133     // JNI hooks
3134     } else if (match_option(option, "-Xcheck", &tail)) {
3135       if (!strcmp(tail, ":jni")) {
3136 #if !INCLUDE_JNI_CHECK
3137         warning("JNI CHECKING is not supported in this VM");
3138 #else
3139         CheckJNICalls = true;
3140 #endif // INCLUDE_JNI_CHECK
3141       } else if (is_bad_option(option, args->ignoreUnrecognized,
3142                                      "check")) {
3143         return JNI_EINVAL;
3144       }
3145     } else if (match_option(option, "vfprintf")) {
3146       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3147     } else if (match_option(option, "exit")) {
3148       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3149     } else if (match_option(option, "abort")) {
3150       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3151     // -XX:+AggressiveHeap
3152     } else if (match_option(option, "-XX:+AggressiveHeap")) {
3153       jint result = set_aggressive_heap_flags();
3154       if (result != JNI_OK) {
3155           return result;
3156       }
3157     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3158     // and the last option wins.
3159     } else if (match_option(option, "-XX:+NeverTenure")) {
3160       if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3161         return JNI_EINVAL;
3162       }
3163       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3164         return JNI_EINVAL;
3165       }
3166       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3167         return JNI_EINVAL;
3168       }
3169     } else if (match_option(option, "-XX:+AlwaysTenure")) {
3170       if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3171         return JNI_EINVAL;
3172       }
3173       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3174         return JNI_EINVAL;
3175       }
3176       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3177         return JNI_EINVAL;
3178       }
3179     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3180       uintx max_tenuring_thresh = 0;
3181       if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3182         jio_fprintf(defaultStream::error_stream(),
3183                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3184         return JNI_EINVAL;
3185       }
3186 
3187       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3188         return JNI_EINVAL;
3189       }
3190 
3191       if (MaxTenuringThreshold == 0) {
3192         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3193           return JNI_EINVAL;
3194         }
3195         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3196           return JNI_EINVAL;
3197         }
3198       } else {
3199         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3200           return JNI_EINVAL;
3201         }
3202         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3203           return JNI_EINVAL;
3204         }
3205       }
3206     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3207       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3208         return JNI_EINVAL;
3209       }
3210       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3211         return JNI_EINVAL;
3212       }
3213     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3214       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3215         return JNI_EINVAL;
3216       }
3217       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3218         return JNI_EINVAL;
3219       }
3220     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3221 #if defined(DTRACE_ENABLED)
3222       if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3223         return JNI_EINVAL;
3224       }
3225       if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3226         return JNI_EINVAL;
3227       }
3228       if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3229         return JNI_EINVAL;
3230       }
3231       if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3232         return JNI_EINVAL;
3233       }
3234 #else // defined(DTRACE_ENABLED)
3235       jio_fprintf(defaultStream::error_stream(),
3236                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3237       return JNI_EINVAL;
3238 #endif // defined(DTRACE_ENABLED)
3239 #ifdef ASSERT
3240     } else if (match_option(option, "-XX:+FullGCALot")) {
3241       if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3242         return JNI_EINVAL;
3243       }
3244       // disable scavenge before parallel mark-compact
3245       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3246         return JNI_EINVAL;
3247       }
3248 #endif
3249 #if !INCLUDE_MANAGEMENT
3250     } else if (match_option(option, "-XX:+ManagementServer")) {
3251         jio_fprintf(defaultStream::error_stream(),
3252           "ManagementServer is not supported in this VM.\n");
3253         return JNI_ERR;
3254 #endif // INCLUDE_MANAGEMENT
3255     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3256       // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3257       // already been handled
3258       if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3259           (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3260         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3261           return JNI_EINVAL;
3262         }
3263       }
3264     // Unknown option
3265     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3266       return JNI_ERR;
3267     }
3268   }
3269 
3270   // PrintSharedArchiveAndExit will turn on
3271   //   -Xshare:on
3272   //   -XX:+TraceClassPaths
3273   if (PrintSharedArchiveAndExit) {
3274     if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3275       return JNI_EINVAL;
3276     }
3277     if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3278       return JNI_EINVAL;
3279     }
3280     if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3281       return JNI_EINVAL;
3282     }
3283   }
3284 
3285   // Change the default value for flags  which have different default values
3286   // when working with older JDKs.
3287 #ifdef LINUX
3288  if (JDK_Version::current().compare_major(6) <= 0 &&
3289       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3290     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3291   }
3292 #endif // LINUX
3293   fix_appclasspath();
3294   return JNI_OK;
3295 }
3296 
3297 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3298 //
3299 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3300 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3301 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3302 // path is treated as the current directory.
3303 //
3304 // This causes problems with CDS, which requires that all directories specified in the classpath
3305 // must be empty. In most cases, applications do NOT want to load classes from the current
3306 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3307 // scripts compatible with CDS.
3308 void Arguments::fix_appclasspath() {
3309   if (IgnoreEmptyClassPaths) {
3310     const char separator = *os::path_separator();
3311     const char* src = _java_class_path->value();
3312 
3313     // skip over all the leading empty paths
3314     while (*src == separator) {
3315       src ++;
3316     }
3317 
3318     char* copy = os::strdup_check_oom(src, mtInternal);
3319 
3320     // trim all trailing empty paths
3321     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3322       *tail = '\0';
3323     }
3324 
3325     char from[3] = {separator, separator, '\0'};
3326     char to  [2] = {separator, '\0'};
3327     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3328       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3329       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3330     }
3331 
3332     _java_class_path->set_value(copy);
3333     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3334   }
3335 
3336   if (!PrintSharedArchiveAndExit) {
3337     ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3338   }
3339 }
3340 
3341 static bool has_jar_files(const char* directory) {
3342   DIR* dir = os::opendir(directory);
3343   if (dir == NULL) return false;
3344 
3345   struct dirent *entry;
3346   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3347   bool hasJarFile = false;
3348   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3349     const char* name = entry->d_name;
3350     const char* ext = name + strlen(name) - 4;
3351     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3352   }
3353   FREE_C_HEAP_ARRAY(char, dbuf);
3354   os::closedir(dir);
3355   return hasJarFile ;
3356 }
3357 
3358 static int check_non_empty_dirs(const char* path) {
3359   const char separator = *os::path_separator();
3360   const char* const end = path + strlen(path);
3361   int nonEmptyDirs = 0;
3362   while (path < end) {
3363     const char* tmp_end = strchr(path, separator);
3364     if (tmp_end == NULL) {
3365       if (has_jar_files(path)) {
3366         nonEmptyDirs++;
3367         jio_fprintf(defaultStream::output_stream(),
3368           "Non-empty directory: %s\n", path);
3369       }
3370       path = end;
3371     } else {
3372       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3373       memcpy(dirpath, path, tmp_end - path);
3374       dirpath[tmp_end - path] = '\0';
3375       if (has_jar_files(dirpath)) {
3376         nonEmptyDirs++;
3377         jio_fprintf(defaultStream::output_stream(),
3378           "Non-empty directory: %s\n", dirpath);
3379       }
3380       FREE_C_HEAP_ARRAY(char, dirpath);
3381       path = tmp_end + 1;
3382     }
3383   }
3384   return nonEmptyDirs;
3385 }
3386 
3387 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3388   // check if the default lib/endorsed directory exists; if so, error
3389   char path[JVM_MAXPATHLEN];
3390   const char* fileSep = os::file_separator();
3391   sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3392 
3393   if (CheckEndorsedAndExtDirs) {
3394     int nonEmptyDirs = 0;
3395     // check endorsed directory
3396     nonEmptyDirs += check_non_empty_dirs(path);
3397     // check the extension directories
3398     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3399     if (nonEmptyDirs > 0) {
3400       return JNI_ERR;
3401     }
3402   }
3403 
3404   DIR* dir = os::opendir(path);
3405   if (dir != NULL) {
3406     jio_fprintf(defaultStream::output_stream(),
3407       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3408       "in modular form will be supported via the concept of upgradeable modules.\n");
3409     os::closedir(dir);
3410     return JNI_ERR;
3411   }
3412 
3413   sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3414   dir = os::opendir(path);
3415   if (dir != NULL) {
3416     jio_fprintf(defaultStream::output_stream(),
3417       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3418       "Use -classpath instead.\n.");
3419     os::closedir(dir);
3420     return JNI_ERR;
3421   }
3422 
3423   if (scp_assembly_required) {
3424     // Assemble the bootclasspath elements into the final path.
3425     char *combined_path = scp_p->combined_path();
3426     Arguments::set_sysclasspath(combined_path);
3427     FREE_C_HEAP_ARRAY(char, combined_path);
3428   }
3429 
3430   // This must be done after all arguments have been processed.
3431   // java_compiler() true means set to "NONE" or empty.
3432   if (java_compiler() && !xdebug_mode()) {
3433     // For backwards compatibility, we switch to interpreted mode if
3434     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3435     // not specified.
3436     set_mode_flags(_int);
3437   }
3438 
3439   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3440   // but like -Xint, leave compilation thresholds unaffected.
3441   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3442   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3443     set_mode_flags(_int);
3444   }
3445 
3446   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3447   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3448     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3449   }
3450 
3451 #if !defined(COMPILER2) && !INCLUDE_JVMCI
3452   // Don't degrade server performance for footprint
3453   if (FLAG_IS_DEFAULT(UseLargePages) &&
3454       MaxHeapSize < LargePageHeapSizeThreshold) {
3455     // No need for large granularity pages w/small heaps.
3456     // Note that large pages are enabled/disabled for both the
3457     // Java heap and the code cache.
3458     FLAG_SET_DEFAULT(UseLargePages, false);
3459   }
3460 
3461 #elif defined(COMPILER2)
3462   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3463     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3464   }
3465 #endif
3466 
3467 #ifndef TIERED
3468   // Tiered compilation is undefined.
3469   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3470 #endif
3471 
3472   // If we are running in a headless jre, force java.awt.headless property
3473   // to be true unless the property has already been set.
3474   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3475   if (os::is_headless_jre()) {
3476     const char* headless = Arguments::get_property("java.awt.headless");
3477     if (headless == NULL) {
3478       const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3479       if (headless_env == NULL) {
3480         if (!add_property("java.awt.headless=true")) {
3481           return JNI_ENOMEM;
3482         }
3483       } else {
3484         char buffer[256];
3485         jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3486         if (!add_property(buffer)) {
3487           return JNI_ENOMEM;
3488         }
3489       }
3490     }
3491   }
3492 
3493   if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3494     // CMS can only be used with ParNew
3495     FLAG_SET_ERGO(bool, UseParNewGC, true);
3496   }
3497 
3498   if (!check_vm_args_consistency()) {
3499     return JNI_ERR;
3500   }
3501 
3502   return JNI_OK;
3503 }
3504 
3505 // Helper class for controlling the lifetime of JavaVMInitArgs
3506 // objects.  The contents of the JavaVMInitArgs are guaranteed to be
3507 // deleted on the destruction of the ScopedVMInitArgs object.
3508 class ScopedVMInitArgs : public StackObj {
3509  private:
3510   JavaVMInitArgs _args;
3511   char*          _container_name;
3512   bool           _is_set;
3513   char*          _vm_options_file_arg;
3514 
3515  public:
3516   ScopedVMInitArgs(const char *container_name) {
3517     _args.version = JNI_VERSION_1_2;
3518     _args.nOptions = 0;
3519     _args.options = NULL;
3520     _args.ignoreUnrecognized = false;
3521     _container_name = (char *)container_name;
3522     _is_set = false;
3523     _vm_options_file_arg = NULL;
3524   }
3525 
3526   // Populates the JavaVMInitArgs object represented by this
3527   // ScopedVMInitArgs object with the arguments in options.  The
3528   // allocated memory is deleted by the destructor.  If this method
3529   // returns anything other than JNI_OK, then this object is in a
3530   // partially constructed state, and should be abandoned.
3531   jint set_args(GrowableArray<JavaVMOption>* options) {
3532     _is_set = true;
3533     JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3534         JavaVMOption, options->length(), mtInternal);
3535     if (options_arr == NULL) {
3536       return JNI_ENOMEM;
3537     }
3538     _args.options = options_arr;
3539 
3540     for (int i = 0; i < options->length(); i++) {
3541       options_arr[i] = options->at(i);
3542       options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3543       if (options_arr[i].optionString == NULL) {
3544         // Rely on the destructor to do cleanup.
3545         _args.nOptions = i;
3546         return JNI_ENOMEM;
3547       }
3548     }
3549 
3550     _args.nOptions = options->length();
3551     _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3552     return JNI_OK;
3553   }
3554 
3555   JavaVMInitArgs* get()             { return &_args; }
3556   char* container_name()            { return _container_name; }
3557   bool  is_set()                    { return _is_set; }
3558   bool  found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3559   char* vm_options_file_arg()       { return _vm_options_file_arg; }
3560 
3561   void set_vm_options_file_arg(const char *vm_options_file_arg) {
3562     if (_vm_options_file_arg != NULL) {
3563       os::free(_vm_options_file_arg);
3564     }
3565     _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3566   }
3567 
3568   ~ScopedVMInitArgs() {
3569     if (_vm_options_file_arg != NULL) {
3570       os::free(_vm_options_file_arg);
3571     }
3572     if (_args.options == NULL) return;
3573     for (int i = 0; i < _args.nOptions; i++) {
3574       os::free(_args.options[i].optionString);
3575     }
3576     FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3577   }
3578 
3579   // Insert options into this option list, to replace option at
3580   // vm_options_file_pos (-XX:VMOptionsFile)
3581   jint insert(const JavaVMInitArgs* args,
3582               const JavaVMInitArgs* args_to_insert,
3583               const int vm_options_file_pos) {
3584     assert(_args.options == NULL, "shouldn't be set yet");
3585     assert(args_to_insert->nOptions != 0, "there should be args to insert");
3586     assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3587 
3588     int length = args->nOptions + args_to_insert->nOptions - 1;
3589     GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3590               GrowableArray<JavaVMOption>(length, true);    // Construct new option array
3591     for (int i = 0; i < args->nOptions; i++) {
3592       if (i == vm_options_file_pos) {
3593         // insert the new options starting at the same place as the
3594         // -XX:VMOptionsFile option
3595         for (int j = 0; j < args_to_insert->nOptions; j++) {
3596           options->push(args_to_insert->options[j]);
3597         }
3598       } else {
3599         options->push(args->options[i]);
3600       }
3601     }
3602     // make into options array
3603     jint result = set_args(options);
3604     delete options;
3605     return result;
3606   }
3607 };
3608 
3609 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3610   return parse_options_environment_variable("_JAVA_OPTIONS", args);
3611 }
3612 
3613 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3614   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3615 }
3616 
3617 jint Arguments::parse_options_environment_variable(const char* name,
3618                                                    ScopedVMInitArgs* vm_args) {
3619   char *buffer = ::getenv(name);
3620 
3621   // Don't check this environment variable if user has special privileges
3622   // (e.g. unix su command).
3623   if (buffer == NULL || os::have_special_privileges()) {
3624     return JNI_OK;
3625   }
3626 
3627   if ((buffer = os::strdup(buffer)) == NULL) {
3628     return JNI_ENOMEM;
3629   }
3630 
3631   int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3632 
3633   os::free(buffer);
3634   return retcode;
3635 }
3636 
3637 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3638   // read file into buffer
3639   int fd = ::open(file_name, O_RDONLY);
3640   if (fd < 0) {
3641     jio_fprintf(defaultStream::error_stream(),
3642                 "Could not open options file '%s'\n",
3643                 file_name);
3644     return JNI_ERR;
3645   }
3646 
3647   struct stat stbuf;
3648   int retcode = os::stat(file_name, &stbuf);
3649   if (retcode != 0) {
3650     jio_fprintf(defaultStream::error_stream(),
3651                 "Could not stat options file '%s'\n",
3652                 file_name);
3653     os::close(fd);
3654     return JNI_ERR;
3655   }
3656 
3657   if (stbuf.st_size == 0) {
3658     // tell caller there is no option data and that is ok
3659     os::close(fd);
3660     return JNI_OK;
3661   }
3662 
3663   // '+ 1' for NULL termination even with max bytes
3664   size_t bytes_alloc = stbuf.st_size + 1;
3665 
3666   char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3667   if (NULL == buf) {
3668     jio_fprintf(defaultStream::error_stream(),
3669                 "Could not allocate read buffer for options file parse\n");
3670     os::close(fd);
3671     return JNI_ENOMEM;
3672   }
3673 
3674   memset(buf, 0, bytes_alloc);
3675 
3676   // Fill buffer
3677   // Use ::read() instead of os::read because os::read()
3678   // might do a thread state transition
3679   // and it is too early for that here
3680 
3681   ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3682   os::close(fd);
3683   if (bytes_read < 0) {
3684     FREE_C_HEAP_ARRAY(char, buf);
3685     jio_fprintf(defaultStream::error_stream(),
3686                 "Could not read options file '%s'\n", file_name);
3687     return JNI_ERR;
3688   }
3689 
3690   if (bytes_read == 0) {
3691     // tell caller there is no option data and that is ok
3692     FREE_C_HEAP_ARRAY(char, buf);
3693     return JNI_OK;
3694   }
3695 
3696   retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3697 
3698   FREE_C_HEAP_ARRAY(char, buf);
3699   return retcode;
3700 }
3701 
3702 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3703   GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true);    // Construct option array
3704 
3705   // some pointers to help with parsing
3706   char *buffer_end = buffer + buf_len;
3707   char *opt_hd = buffer;
3708   char *wrt = buffer;
3709   char *rd = buffer;
3710 
3711   // parse all options
3712   while (rd < buffer_end) {
3713     // skip leading white space from the input string
3714     while (rd < buffer_end && isspace(*rd)) {
3715       rd++;
3716     }
3717 
3718     if (rd >= buffer_end) {
3719       break;
3720     }
3721 
3722     // Remember this is where we found the head of the token.
3723     opt_hd = wrt;
3724 
3725     // Tokens are strings of non white space characters separated
3726     // by one or more white spaces.
3727     while (rd < buffer_end && !isspace(*rd)) {
3728       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3729         int quote = *rd;                    // matching quote to look for
3730         rd++;                               // don't copy open quote
3731         while (rd < buffer_end && *rd != quote) {
3732                                             // include everything (even spaces)
3733                                             // up until the close quote
3734           *wrt++ = *rd++;                   // copy to option string
3735         }
3736 
3737         if (rd < buffer_end) {
3738           rd++;                             // don't copy close quote
3739         } else {
3740                                             // did not see closing quote
3741           jio_fprintf(defaultStream::error_stream(),
3742                       "Unmatched quote in %s\n", name);
3743           delete options;
3744           return JNI_ERR;
3745         }
3746       } else {
3747         *wrt++ = *rd++;                     // copy to option string
3748       }
3749     }
3750 
3751     // steal a white space character and set it to NULL
3752     *wrt++ = '\0';
3753     // We now have a complete token
3754 
3755     JavaVMOption option;
3756     option.optionString = opt_hd;
3757     option.extraInfo = NULL;
3758 
3759     options->append(option);                // Fill in option
3760 
3761     rd++;  // Advance to next character
3762   }
3763 
3764   // Fill out JavaVMInitArgs structure.
3765   jint status = vm_args->set_args(options);
3766 
3767   delete options;
3768   return status;
3769 }
3770 
3771 void Arguments::set_shared_spaces_flags() {
3772   if (DumpSharedSpaces) {
3773     if (RequireSharedSpaces) {
3774       warning("Cannot dump shared archive while using shared archive");
3775     }
3776     UseSharedSpaces = false;
3777 #ifdef _LP64
3778     if (!UseCompressedOops || !UseCompressedClassPointers) {
3779       vm_exit_during_initialization(
3780         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3781     }
3782   } else {
3783     if (!UseCompressedOops || !UseCompressedClassPointers) {
3784       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3785     }
3786 #endif
3787   }
3788 }
3789 
3790 #if !INCLUDE_ALL_GCS
3791 static void force_serial_gc() {
3792   FLAG_SET_DEFAULT(UseSerialGC, true);
3793   UNSUPPORTED_GC_OPTION(UseG1GC);
3794   UNSUPPORTED_GC_OPTION(UseParallelGC);
3795   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3796   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3797   UNSUPPORTED_GC_OPTION(UseParNewGC);
3798 }
3799 #endif // INCLUDE_ALL_GCS
3800 
3801 // Sharing support
3802 // Construct the path to the archive
3803 static char* get_shared_archive_path() {
3804   char *shared_archive_path;
3805   if (SharedArchiveFile == NULL) {
3806     char jvm_path[JVM_MAXPATHLEN];
3807     os::jvm_path(jvm_path, sizeof(jvm_path));
3808     char *end = strrchr(jvm_path, *os::file_separator());
3809     if (end != NULL) *end = '\0';
3810     size_t jvm_path_len = strlen(jvm_path);
3811     size_t file_sep_len = strlen(os::file_separator());
3812     const size_t len = jvm_path_len + file_sep_len + 20;
3813     shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3814     if (shared_archive_path != NULL) {
3815       jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3816         jvm_path, os::file_separator());
3817     }
3818   } else {
3819     shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3820   }
3821   return shared_archive_path;
3822 }
3823 
3824 #ifndef PRODUCT
3825 // Determine whether LogVMOutput should be implicitly turned on.
3826 static bool use_vm_log() {
3827   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3828       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3829       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3830       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3831       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3832     return true;
3833   }
3834 
3835 #ifdef COMPILER1
3836   if (PrintC1Statistics) {
3837     return true;
3838   }
3839 #endif // COMPILER1
3840 
3841 #ifdef COMPILER2
3842   if (PrintOptoAssembly || PrintOptoStatistics) {
3843     return true;
3844   }
3845 #endif // COMPILER2
3846 
3847   return false;
3848 }
3849 
3850 #endif // PRODUCT
3851 
3852 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3853   for (int index = 0; index < args->nOptions; index++) {
3854     const JavaVMOption* option = args->options + index;
3855     const char* tail;
3856     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3857       return true;
3858     }
3859   }
3860   return false;
3861 }
3862 
3863 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3864                                        const char* vm_options_file,
3865                                        const int vm_options_file_pos,
3866                                        ScopedVMInitArgs* vm_options_file_args,
3867                                        ScopedVMInitArgs* args_out) {
3868   jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3869   if (code != JNI_OK) {
3870     return code;
3871   }
3872 
3873   if (vm_options_file_args->get()->nOptions < 1) {
3874     return JNI_OK;
3875   }
3876 
3877   if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3878     jio_fprintf(defaultStream::error_stream(),
3879                 "A VM options file may not refer to a VM options file. "
3880                 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3881                 "options file '%s' in options container '%s' is an error.\n",
3882                 vm_options_file_args->vm_options_file_arg(),
3883                 vm_options_file_args->container_name());
3884     return JNI_EINVAL;
3885   }
3886 
3887   return args_out->insert(args, vm_options_file_args->get(),
3888                           vm_options_file_pos);
3889 }
3890 
3891 // Expand -XX:VMOptionsFile found in args_in as needed.
3892 // mod_args and args_out parameters may return values as needed.
3893 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3894                                             ScopedVMInitArgs* mod_args,
3895                                             JavaVMInitArgs** args_out) {
3896   jint code = match_special_option_and_act(args_in, mod_args);
3897   if (code != JNI_OK) {
3898     return code;
3899   }
3900 
3901   if (mod_args->is_set()) {
3902     // args_in contains -XX:VMOptionsFile and mod_args contains the
3903     // original options from args_in along with the options expanded
3904     // from the VMOptionsFile. Return a short-hand to the caller.
3905     *args_out = mod_args->get();
3906   } else {
3907     *args_out = (JavaVMInitArgs *)args_in;  // no changes so use args_in
3908   }
3909   return JNI_OK;
3910 }
3911 
3912 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3913                                              ScopedVMInitArgs* args_out) {
3914   // Remaining part of option string
3915   const char* tail;
3916   ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3917 
3918   for (int index = 0; index < args->nOptions; index++) {
3919     const JavaVMOption* option = args->options + index;
3920     if (ArgumentsExt::process_options(option)) {
3921       continue;
3922     }
3923     if (match_option(option, "-XX:Flags=", &tail)) {
3924       Arguments::set_jvm_flags_file(tail);
3925       continue;
3926     }
3927     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3928       if (vm_options_file_args.found_vm_options_file_arg()) {
3929         jio_fprintf(defaultStream::error_stream(),
3930                     "The option '%s' is already specified in the options "
3931                     "container '%s' so the specification of '%s' in the "
3932                     "same options container is an error.\n",
3933                     vm_options_file_args.vm_options_file_arg(),
3934                     vm_options_file_args.container_name(),
3935                     option->optionString);
3936         return JNI_EINVAL;
3937       }
3938       vm_options_file_args.set_vm_options_file_arg(option->optionString);
3939       // If there's a VMOptionsFile, parse that
3940       jint code = insert_vm_options_file(args, tail, index,
3941                                          &vm_options_file_args, args_out);
3942       if (code != JNI_OK) {
3943         return code;
3944       }
3945       args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3946       if (args_out->is_set()) {
3947         // The VMOptions file inserted some options so switch 'args'
3948         // to the new set of options, and continue processing which
3949         // preserves "last option wins" semantics.
3950         args = args_out->get();
3951         // The first option from the VMOptionsFile replaces the
3952         // current option.  So we back track to process the
3953         // replacement option.
3954         index--;
3955       }
3956       continue;
3957     }
3958     if (match_option(option, "-XX:+PrintVMOptions")) {
3959       PrintVMOptions = true;
3960       continue;
3961     }
3962     if (match_option(option, "-XX:-PrintVMOptions")) {
3963       PrintVMOptions = false;
3964       continue;
3965     }
3966     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3967       IgnoreUnrecognizedVMOptions = true;
3968       continue;
3969     }
3970     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3971       IgnoreUnrecognizedVMOptions = false;
3972       continue;
3973     }
3974     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3975       CommandLineFlags::printFlags(tty, false);
3976       vm_exit(0);
3977     }
3978     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3979 #if INCLUDE_NMT
3980       // The launcher did not setup nmt environment variable properly.
3981       if (!MemTracker::check_launcher_nmt_support(tail)) {
3982         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3983       }
3984 
3985       // Verify if nmt option is valid.
3986       if (MemTracker::verify_nmt_option()) {
3987         // Late initialization, still in single-threaded mode.
3988         if (MemTracker::tracking_level() >= NMT_summary) {
3989           MemTracker::init();
3990         }
3991       } else {
3992         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3993       }
3994       continue;
3995 #else
3996       jio_fprintf(defaultStream::error_stream(),
3997         "Native Memory Tracking is not supported in this VM\n");
3998       return JNI_ERR;
3999 #endif
4000     }
4001 
4002 #ifndef PRODUCT
4003     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4004       CommandLineFlags::printFlags(tty, true);
4005       vm_exit(0);
4006     }
4007 #endif
4008   }
4009   return JNI_OK;
4010 }
4011 
4012 static void print_options(const JavaVMInitArgs *args) {
4013   const char* tail;
4014   for (int index = 0; index < args->nOptions; index++) {
4015     const JavaVMOption *option = args->options + index;
4016     if (match_option(option, "-XX:", &tail)) {
4017       logOption(tail);
4018     }
4019   }
4020 }
4021 
4022 bool Arguments::handle_deprecated_print_gc_flags() {
4023   if (PrintGC) {
4024     log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
4025   }
4026   if (PrintGCDetails) {
4027     log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
4028   }
4029 
4030   if (_gc_log_filename != NULL) {
4031     // -Xloggc was used to specify a filename
4032     const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
4033     return  LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, NULL);
4034   } else if (PrintGC || PrintGCDetails) {
4035     LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
4036   }
4037   return true;
4038 }
4039 
4040 // Parse entry point called from JNI_CreateJavaVM
4041 
4042 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
4043   assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
4044 
4045   // Initialize ranges and constraints
4046   CommandLineFlagRangeList::init();
4047   CommandLineFlagConstraintList::init();
4048 
4049   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4050   const char* hotspotrc = ".hotspotrc";
4051   bool settings_file_specified = false;
4052   bool needs_hotspotrc_warning = false;
4053   ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4054   ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
4055 
4056   // Pointers to current working set of containers
4057   JavaVMInitArgs* cur_cmd_args;
4058   JavaVMInitArgs* cur_java_options_args;
4059   JavaVMInitArgs* cur_java_tool_options_args;
4060 
4061   // Containers for modified/expanded options
4062   ScopedVMInitArgs mod_cmd_args("cmd_line_args");
4063   ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
4064   ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
4065 
4066 
4067   jint code =
4068       parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
4069   if (code != JNI_OK) {
4070     return code;
4071   }
4072 
4073   code = parse_java_options_environment_variable(&initial_java_options_args);
4074   if (code != JNI_OK) {
4075     return code;
4076   }
4077 
4078   code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
4079                                      &mod_java_tool_options_args,
4080                                      &cur_java_tool_options_args);
4081   if (code != JNI_OK) {
4082     return code;
4083   }
4084 
4085   code = expand_vm_options_as_needed(initial_cmd_args,
4086                                      &mod_cmd_args,
4087                                      &cur_cmd_args);
4088   if (code != JNI_OK) {
4089     return code;
4090   }
4091 
4092   code = expand_vm_options_as_needed(initial_java_options_args.get(),
4093                                      &mod_java_options_args,
4094                                      &cur_java_options_args);
4095   if (code != JNI_OK) {
4096     return code;
4097   }
4098 
4099   const char* flags_file = Arguments::get_jvm_flags_file();
4100   settings_file_specified = (flags_file != NULL);
4101 
4102   if (IgnoreUnrecognizedVMOptions) {
4103     cur_cmd_args->ignoreUnrecognized = true;
4104     cur_java_tool_options_args->ignoreUnrecognized = true;
4105     cur_java_options_args->ignoreUnrecognized = true;
4106   }
4107 
4108   // Parse specified settings file
4109   if (settings_file_specified) {
4110     if (!process_settings_file(flags_file, true,
4111                                cur_cmd_args->ignoreUnrecognized)) {
4112       return JNI_EINVAL;
4113     }
4114   } else {
4115 #ifdef ASSERT
4116     // Parse default .hotspotrc settings file
4117     if (!process_settings_file(".hotspotrc", false,
4118                                cur_cmd_args->ignoreUnrecognized)) {
4119       return JNI_EINVAL;
4120     }
4121 #else
4122     struct stat buf;
4123     if (os::stat(hotspotrc, &buf) == 0) {
4124       needs_hotspotrc_warning = true;
4125     }
4126 #endif
4127   }
4128 
4129   if (PrintVMOptions) {
4130     print_options(cur_java_tool_options_args);
4131     print_options(cur_cmd_args);
4132     print_options(cur_java_options_args);
4133   }
4134 
4135   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4136   jint result = parse_vm_init_args(cur_java_tool_options_args,
4137                                    cur_java_options_args,
4138                                    cur_cmd_args);
4139 
4140   if (result != JNI_OK) {
4141     return result;
4142   }
4143 
4144   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4145   SharedArchivePath = get_shared_archive_path();
4146   if (SharedArchivePath == NULL) {
4147     return JNI_ENOMEM;
4148   }
4149 
4150   // Set up VerifySharedSpaces
4151   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4152     VerifySharedSpaces = true;
4153   }
4154 
4155   // Delay warning until here so that we've had a chance to process
4156   // the -XX:-PrintWarnings flag
4157   if (needs_hotspotrc_warning) {
4158     warning("%s file is present but has been ignored.  "
4159             "Run with -XX:Flags=%s to load the file.",
4160             hotspotrc, hotspotrc);
4161   }
4162 
4163 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
4164   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4165 #endif
4166 
4167   ArgumentsExt::report_unsupported_options();
4168 
4169 #ifndef PRODUCT
4170   if (TraceBytecodesAt != 0) {
4171     TraceBytecodes = true;
4172   }
4173   if (CountCompiledCalls) {
4174     if (UseCounterDecay) {
4175       warning("UseCounterDecay disabled because CountCalls is set");
4176       UseCounterDecay = false;
4177     }
4178   }
4179 #endif // PRODUCT
4180 
4181   if (ScavengeRootsInCode == 0) {
4182     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4183       warning("Forcing ScavengeRootsInCode non-zero");
4184     }
4185     ScavengeRootsInCode = 1;
4186   }
4187 
4188   if (!handle_deprecated_print_gc_flags()) {
4189     return JNI_EINVAL;
4190   }
4191 
4192   // Set object alignment values.
4193   set_object_alignment();
4194 
4195 #if !INCLUDE_ALL_GCS
4196   force_serial_gc();
4197 #endif // INCLUDE_ALL_GCS
4198 #if !INCLUDE_CDS
4199   if (DumpSharedSpaces || RequireSharedSpaces) {
4200     jio_fprintf(defaultStream::error_stream(),
4201       "Shared spaces are not supported in this VM\n");
4202     return JNI_ERR;
4203   }
4204   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4205     warning("Shared spaces are not supported in this VM");
4206     FLAG_SET_DEFAULT(UseSharedSpaces, false);
4207     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4208   }
4209   no_shared_spaces("CDS Disabled");
4210 #endif // INCLUDE_CDS
4211 
4212   return JNI_OK;
4213 }
4214 
4215 jint Arguments::apply_ergo() {
4216 
4217   // Set flags based on ergonomics.
4218   set_ergonomics_flags();
4219 
4220   set_shared_spaces_flags();
4221 
4222   // Check the GC selections again.
4223   if (!check_gc_consistency()) {
4224     return JNI_EINVAL;
4225   }
4226 
4227   if (TieredCompilation) {
4228     set_tiered_flags();
4229   } else {
4230     int max_compilation_policy_choice = 1;
4231 #ifdef COMPILER2
4232     max_compilation_policy_choice = 2;
4233 #endif
4234     // Check if the policy is valid.
4235     if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4236       vm_exit_during_initialization(
4237         "Incompatible compilation policy selected", NULL);
4238     }
4239     // Scale CompileThreshold
4240     // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4241     if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4242       FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4243     }
4244   }
4245 
4246 #ifdef COMPILER2
4247 #ifndef PRODUCT
4248   if (PrintIdealGraphLevel > 0) {
4249     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4250   }
4251 #endif
4252 #endif
4253 
4254   // Set heap size based on available physical memory
4255   set_heap_size();
4256 
4257   ArgumentsExt::set_gc_specific_flags();
4258 
4259   // Initialize Metaspace flags and alignments
4260   Metaspace::ergo_initialize();
4261 
4262   // Set bytecode rewriting flags
4263   set_bytecode_flags();
4264 
4265   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4266   jint code = set_aggressive_opts_flags();
4267   if (code != JNI_OK) {
4268     return code;
4269   }
4270 
4271   // Turn off biased locking for locking debug mode flags,
4272   // which are subtly different from each other but neither works with
4273   // biased locking
4274   if (UseHeavyMonitors
4275 #ifdef COMPILER1
4276       || !UseFastLocking
4277 #endif // COMPILER1
4278 #if INCLUDE_JVMCI
4279       || !JVMCIUseFastLocking
4280 #endif
4281     ) {
4282     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4283       // flag set to true on command line; warn the user that they
4284       // can't enable biased locking here
4285       warning("Biased Locking is not supported with locking debug flags"
4286               "; ignoring UseBiasedLocking flag." );
4287     }
4288     UseBiasedLocking = false;
4289   }
4290 
4291 #ifdef CC_INTERP
4292   // Clear flags not supported on zero.
4293   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4294   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4295   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4296   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4297 #endif // CC_INTERP
4298 
4299 #ifdef COMPILER2
4300   if (!EliminateLocks) {
4301     EliminateNestedLocks = false;
4302   }
4303   if (!Inline) {
4304     IncrementalInline = false;
4305   }
4306 #ifndef PRODUCT
4307   if (!IncrementalInline) {
4308     AlwaysIncrementalInline = false;
4309   }
4310 #endif
4311   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4312     // nothing to use the profiling, turn if off
4313     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4314   }
4315 #endif
4316 
4317   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4318     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4319     DebugNonSafepoints = true;
4320   }
4321 
4322   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4323     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4324   }
4325 
4326 #ifndef PRODUCT
4327   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4328     if (use_vm_log()) {
4329       LogVMOutput = true;
4330     }
4331   }
4332 #endif // PRODUCT
4333 
4334   if (PrintCommandLineFlags) {
4335     CommandLineFlags::printSetFlags(tty);
4336   }
4337 
4338   // Apply CPU specific policy for the BiasedLocking
4339   if (UseBiasedLocking) {
4340     if (!VM_Version::use_biased_locking() &&
4341         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4342       UseBiasedLocking = false;
4343     }
4344   }
4345 #ifdef COMPILER2
4346   if (!UseBiasedLocking || EmitSync != 0) {
4347     UseOptoBiasInlining = false;
4348   }
4349 #endif
4350 
4351   return JNI_OK;
4352 }
4353 
4354 jint Arguments::adjust_after_os() {
4355   if (UseNUMA) {
4356     if (UseParallelGC || UseParallelOldGC) {
4357       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4358          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4359       }
4360     }
4361     // UseNUMAInterleaving is set to ON for all collectors and
4362     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4363     // such as the parallel collector for Linux and Solaris will
4364     // interleave old gen and survivor spaces on top of NUMA
4365     // allocation policy for the eden space.
4366     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4367     // all platforms and ParallelGC on Windows will interleave all
4368     // of the heap spaces across NUMA nodes.
4369     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4370       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4371     }
4372   }
4373   return JNI_OK;
4374 }
4375 
4376 int Arguments::PropertyList_count(SystemProperty* pl) {
4377   int count = 0;
4378   while(pl != NULL) {
4379     count++;
4380     pl = pl->next();
4381   }
4382   return count;
4383 }
4384 
4385 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4386   assert(key != NULL, "just checking");
4387   SystemProperty* prop;
4388   for (prop = pl; prop != NULL; prop = prop->next()) {
4389     if (strcmp(key, prop->key()) == 0) return prop->value();
4390   }
4391   return NULL;
4392 }
4393 
4394 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4395   int count = 0;
4396   const char* ret_val = NULL;
4397 
4398   while(pl != NULL) {
4399     if(count >= index) {
4400       ret_val = pl->key();
4401       break;
4402     }
4403     count++;
4404     pl = pl->next();
4405   }
4406 
4407   return ret_val;
4408 }
4409 
4410 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4411   int count = 0;
4412   char* ret_val = NULL;
4413 
4414   while(pl != NULL) {
4415     if(count >= index) {
4416       ret_val = pl->value();
4417       break;
4418     }
4419     count++;
4420     pl = pl->next();
4421   }
4422 
4423   return ret_val;
4424 }
4425 
4426 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4427   SystemProperty* p = *plist;
4428   if (p == NULL) {
4429     *plist = new_p;
4430   } else {
4431     while (p->next() != NULL) {
4432       p = p->next();
4433     }
4434     p->set_next(new_p);
4435   }
4436 }
4437 
4438 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4439   if (plist == NULL)
4440     return;
4441 
4442   SystemProperty* new_p = new SystemProperty(k, v, true);
4443   PropertyList_add(plist, new_p);
4444 }
4445 
4446 void Arguments::PropertyList_add(SystemProperty *element) {
4447   PropertyList_add(&_system_properties, element);
4448 }
4449 
4450 // This add maintains unique property key in the list.
4451 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4452   if (plist == NULL)
4453     return;
4454 
4455   // If property key exist then update with new value.
4456   SystemProperty* prop;
4457   for (prop = *plist; prop != NULL; prop = prop->next()) {
4458     if (strcmp(k, prop->key()) == 0) {
4459       if (append) {
4460         prop->append_value(v);
4461       } else {
4462         prop->set_value(v);
4463       }
4464       return;
4465     }
4466   }
4467 
4468   PropertyList_add(plist, k, v);
4469 }
4470 
4471 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4472 // Returns true if all of the source pointed by src has been copied over to
4473 // the destination buffer pointed by buf. Otherwise, returns false.
4474 // Notes:
4475 // 1. If the length (buflen) of the destination buffer excluding the
4476 // NULL terminator character is not long enough for holding the expanded
4477 // pid characters, it also returns false instead of returning the partially
4478 // expanded one.
4479 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4480 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4481                                 char* buf, size_t buflen) {
4482   const char* p = src;
4483   char* b = buf;
4484   const char* src_end = &src[srclen];
4485   char* buf_end = &buf[buflen - 1];
4486 
4487   while (p < src_end && b < buf_end) {
4488     if (*p == '%') {
4489       switch (*(++p)) {
4490       case '%':         // "%%" ==> "%"
4491         *b++ = *p++;
4492         break;
4493       case 'p':  {       //  "%p" ==> current process id
4494         // buf_end points to the character before the last character so
4495         // that we could write '\0' to the end of the buffer.
4496         size_t buf_sz = buf_end - b + 1;
4497         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4498 
4499         // if jio_snprintf fails or the buffer is not long enough to hold
4500         // the expanded pid, returns false.
4501         if (ret < 0 || ret >= (int)buf_sz) {
4502           return false;
4503         } else {
4504           b += ret;
4505           assert(*b == '\0', "fail in copy_expand_pid");
4506           if (p == src_end && b == buf_end + 1) {
4507             // reach the end of the buffer.
4508             return true;
4509           }
4510         }
4511         p++;
4512         break;
4513       }
4514       default :
4515         *b++ = '%';
4516       }
4517     } else {
4518       *b++ = *p++;
4519     }
4520   }
4521   *b = '\0';
4522   return (p == src_end); // return false if not all of the source was copied
4523 }