1 /*
   2  * Copyright (c) 1997, 2015, 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 "compiler/compilerOracle.hpp"
  31 #include "memory/allocation.inline.hpp"
  32 #include "memory/cardTableRS.hpp"
  33 #include "memory/genCollectedHeap.hpp"
  34 #include "memory/referenceProcessor.hpp"
  35 #include "memory/universe.inline.hpp"
  36 #include "oops/oop.inline.hpp"
  37 #include "prims/jvmtiExport.hpp"
  38 #include "runtime/arguments.hpp"
  39 #include "runtime/arguments_ext.hpp"
  40 #include "runtime/globals_extension.hpp"
  41 #include "runtime/java.hpp"
  42 #include "runtime/os.hpp"
  43 #include "runtime/vm_version.hpp"
  44 #include "services/management.hpp"
  45 #include "services/memTracker.hpp"
  46 #include "utilities/defaultStream.hpp"
  47 #include "utilities/macros.hpp"
  48 #include "utilities/stringUtils.hpp"
  49 #include "utilities/taskqueue.hpp"
  50 #if INCLUDE_ALL_GCS
  51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  54 #endif // INCLUDE_ALL_GCS
  55 
  56 // Note: This is a special bug reporting site for the JVM
  57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  58 #define DEFAULT_JAVA_LAUNCHER  "generic"
  59 
  60 // Disable options not supported in this release, with a warning if they
  61 // were explicitly requested on the command-line
  62 #define UNSUPPORTED_OPTION(opt, description)                    \
  63 do {                                                            \
  64   if (opt) {                                                    \
  65     if (FLAG_IS_CMDLINE(opt)) {                                 \
  66       warning(description " is disabled in this release.");     \
  67     }                                                           \
  68     FLAG_SET_DEFAULT(opt, false);                               \
  69   }                                                             \
  70 } while(0)
  71 
  72 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  73 do {                                                                  \
  74   if (gc) {                                                           \
  75     if (FLAG_IS_CMDLINE(gc)) {                                        \
  76       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  77     }                                                                 \
  78     FLAG_SET_DEFAULT(gc, false);                                      \
  79   }                                                                   \
  80 } while(0)
  81 
  82 char**  Arguments::_jvm_flags_array             = NULL;
  83 int     Arguments::_num_jvm_flags               = 0;
  84 char**  Arguments::_jvm_args_array              = NULL;
  85 int     Arguments::_num_jvm_args                = 0;
  86 char*  Arguments::_java_command                 = NULL;
  87 SystemProperty* Arguments::_system_properties   = NULL;
  88 const char*  Arguments::_gc_log_filename        = NULL;
  89 bool   Arguments::_has_profile                  = false;
  90 size_t Arguments::_conservative_max_heap_alignment = 0;
  91 uintx  Arguments::_min_heap_size                = 0;
  92 uintx  Arguments::_min_heap_free_ratio          = 0;
  93 uintx  Arguments::_max_heap_free_ratio          = 0;
  94 Arguments::Mode Arguments::_mode                = _mixed;
  95 bool   Arguments::_java_compiler                = false;
  96 bool   Arguments::_xdebug_mode                  = false;
  97 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  98 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  99 int    Arguments::_sun_java_launcher_pid        = -1;
 100 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
 101 
 102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
 103 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 104 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 105 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 106 bool   Arguments::_ClipInlining                 = ClipInlining;
 107 
 108 char*  Arguments::SharedArchivePath             = NULL;
 109 
 110 AgentLibraryList Arguments::_libraryList;
 111 AgentLibraryList Arguments::_agentList;
 112 
 113 abort_hook_t     Arguments::_abort_hook         = NULL;
 114 exit_hook_t      Arguments::_exit_hook          = NULL;
 115 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 116 
 117 
 118 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 119 SystemProperty *Arguments::_java_library_path = NULL;
 120 SystemProperty *Arguments::_java_home = NULL;
 121 SystemProperty *Arguments::_java_class_path = NULL;
 122 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 123 
 124 char* Arguments::_meta_index_path = NULL;
 125 char* Arguments::_meta_index_dir = NULL;
 126 char* Arguments::_ext_dirs = NULL;
 127 
 128 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 129 // part of the option string.
 130 static bool match_option(const JavaVMOption *option, const char* name,
 131                          const char** tail) {
 132   int len = (int)strlen(name);
 133   if (strncmp(option->optionString, name, len) == 0) {
 134     *tail = option->optionString + len;
 135     return true;
 136   } else {
 137     return false;
 138   }
 139 }
 140 
 141 // Check if 'option' matches 'name'. No "tail" is allowed.
 142 static bool match_option(const JavaVMOption *option, const char* name) {
 143   const char* tail = NULL;
 144   bool result = match_option(option, name, &tail);
 145   if (tail != NULL && *tail == '\0') {
 146     return result;
 147   } else {
 148     return false;
 149   }
 150 }
 151 
 152 // Return true if any of the strings in null-terminated array 'names' matches.
 153 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 154 // the option must match exactly.
 155 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 156   bool tail_allowed) {
 157   for (/* empty */; *names != NULL; ++names) {
 158     if (match_option(option, *names, tail)) {
 159       if (**tail == '\0' || tail_allowed && **tail == ':') {
 160         return true;
 161       }
 162     }
 163   }
 164   return false;
 165 }
 166 
 167 static void logOption(const char* opt) {
 168   if (PrintVMOptions) {
 169     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 170   }
 171 }
 172 
 173 // Process java launcher properties.
 174 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 175   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 176   // sun.java.launcher.pid is defined.
 177   // Must do this before setting up other system properties,
 178   // as some of them may depend on launcher type.
 179   for (int index = 0; index < args->nOptions; index++) {
 180     const JavaVMOption* option = args->options + index;
 181     const char* tail;
 182 
 183     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 184       process_java_launcher_argument(tail, option->extraInfo);
 185       continue;
 186     }
 187     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 188       if (strcmp(tail, "true") == 0) {
 189         _sun_java_launcher_is_altjvm = true;
 190       }
 191       continue;
 192     }
 193     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 194       _sun_java_launcher_pid = atoi(tail);
 195       continue;
 196     }
 197   }
 198 }
 199 
 200 // Initialize system properties key and value.
 201 void Arguments::init_system_properties() {
 202 
 203   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 204                                                                  "Java Virtual Machine Specification",  false));
 205   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 206   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 207   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 208 
 209   // Following are JVMTI agent writable properties.
 210   // Properties values are set to NULL and they are
 211   // os specific they are initialized in os::init_system_properties_values().
 212   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 213   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 214   _java_home =  new SystemProperty("java.home", NULL,  true);
 215   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 216 
 217   _java_class_path = new SystemProperty("java.class.path", "",  true);
 218 
 219   // Add to System Property list.
 220   PropertyList_add(&_system_properties, _sun_boot_library_path);
 221   PropertyList_add(&_system_properties, _java_library_path);
 222   PropertyList_add(&_system_properties, _java_home);
 223   PropertyList_add(&_system_properties, _java_class_path);
 224   PropertyList_add(&_system_properties, _sun_boot_class_path);
 225 
 226   // Set OS specific system properties values
 227   os::init_system_properties_values();
 228 }
 229 
 230 
 231   // Update/Initialize System properties after JDK version number is known
 232 void Arguments::init_version_specific_system_properties() {
 233   enum { bufsz = 16 };
 234   char buffer[bufsz];
 235   const char* spec_vendor = "Sun Microsystems Inc.";
 236   uint32_t spec_version = 0;
 237 
 238   spec_vendor = "Oracle Corporation";
 239   spec_version = JDK_Version::current().major_version();
 240   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 241 
 242   PropertyList_add(&_system_properties,
 243       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 244   PropertyList_add(&_system_properties,
 245       new SystemProperty("java.vm.specification.version", buffer, false));
 246   PropertyList_add(&_system_properties,
 247       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 248 }
 249 
 250 /*
 251  *  -XX argument processing:
 252  * 
 253  *  -XX arguments are usually defined in globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
 254  *  -XX arguments are parsed in parse_argument().
 255  *  -XX argument bounds checking is done in check_vm_args_consistency().
 256  * 
 257  * Over time -XX arguments may change. There are mechanisms to handle common cases:
 258  * 
 259  *        ALIAS: An option may be renamed or replaced by another option. The old name can be supported by adding 
 260  *               the old and new option names to the "aliased_jvm_flags" table. Delete the old variable from globals.hpp.
 261  *               This is often part of the process of deprecating a flag, but not all aliases need to be deprecated.
 262  * 
 263  *   DEPRECATED: An option may be supported, but a warning is printed to let the user know that support may be removed
 264  *               in the future. Both regular and aliased options may be deprecated.
 265  *               Add a deprecation warning for an option (or alias) by adding an entry in the "deprecated_jvm_flags" table. 
 266  *               Specify the option name, the jdk version that deprecated the option, and the jdk version that will
 267  *               expire the option (if removal has been scheduled).
 268  * 
 269  *     OBSOLETE: An option may be removed (and deleted from globals.hpp), but still be accepted on the command line.
 270  *               A warning is printed to let the user know that support may be removed in the future. 
 271  *               Add an obsolete warning for an option (or alias) by adding an entry in the "obsolete_jvm_flags" table. 
 272  *               Specify the option name, the jdk version that obsoleted the option, and the jdk version that will
 273  *               expire the option (if removal has been scheduled).
 274  * 
 275  *      EXPIRED: When the current JDK version is equal or greater to the "accept_until" version of a deprecated or obsolete
 276  *               option, the system will flatly refuse to admit the existence of the flag. This allows a flag to die correctly
 277  *               over JDK releases using HSX.
 278  *               Note that manual cleanup of expired options should be done at major JDK version upgrades:
 279  *                  - Expired options can be removed from the obsolete_jvm_flags, deprecated_jvm_flags tables, and aliased_jvm_flags tables.
 280  *                  - Expired deprecated options may still have global variable definitions that should be removed (in globals.hpp, etc).
 281  * 
 282  * Tests:  Aliases are tested in VMAliasOptions.java. Deprecated options in VMDeprecatedOptions.java. Obsolete options are tested in various files.
 283  */
 284 
 285 // Obsolete or deprecated -XX flag.
 286 typedef struct {
 287   const char* name;
 288   JDK_Version obsoleted_in; // When the warning started (obsolete or deprecated).
 289   JDK_Version accept_until; // Which version to start denying the existence of the flag (if scheduled).
 290   
 291   static const uint8_t _removal_unscheduled = 0;
 292   
 293   bool is_removal_scheduled() const {
 294       return accept_until.major_version() != _removal_unscheduled;
 295   }
 296   
 297 } SpecialFlag;
 298 
 299 // When a flag is eliminated, it can be added to this list in order to
 300 // continue accepting this flag on the command-line, while issuing a warning
 301 // and ignoring the value.  Once the JDK version reaches the 'accept_until'
 302 // limit, we flatly refuse to admit the existence of the flag.
 303 static SpecialFlag const obsolete_jvm_flags[] = {
 304   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 305   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 306   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 307   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 308   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 309   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 310   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 311   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 312   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 313   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 314   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 315   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 316   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 317   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 318   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 319   { "DefaultInitialRAMFraction",
 320                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 321   { "UseDepthFirstScavengeOrder",
 322                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 323   { "HandlePromotionFailure",
 324                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 325   { "MaxLiveObjectEvacuationRatio",
 326                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 327   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 328   { "UseParallelOldGCCompacting",
 329                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 330   { "UseParallelDensePrefixUpdate",
 331                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 332   { "UseParallelOldGCDensePrefix",
 333                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 334   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 335   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 336   { "CMSPermGenPrecleaningEnabled",  JDK_Version::jdk(8), JDK_Version::jdk(9) },
 337   { "CMSTriggerPermRatio",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 338   { "CMSInitiatingPermOccupancyFraction",
 339                                      JDK_Version::jdk(8), JDK_Version::jdk(9) },
 340   { "AdaptivePermSizeWeight",        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 341   { "PermGenPadding",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 342   { "PermMarkSweepDeadRatio",        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 343   { "PermSize",                      JDK_Version::jdk(8), JDK_Version::jdk(9) },
 344   { "MaxPermSize",                   JDK_Version::jdk(8), JDK_Version::jdk(9) },
 345   { "MinPermHeapExpansion",          JDK_Version::jdk(8), JDK_Version::jdk(9) },
 346   { "MaxPermHeapExpansion",          JDK_Version::jdk(8), JDK_Version::jdk(9) },
 347   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 348   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 349   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 350   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 351   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 352   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 353   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 354   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 355   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 356   { "SafepointPollOffset",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 357 #ifdef PRODUCT
 358   { "DesiredMethodLimit",  JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 359 #endif // PRODUCT
 360   { "UseVMInterruptibleIO",          JDK_Version::jdk(8), JDK_Version::jdk(9) },
 361   { "UseBoundThreads",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 362   { "DefaultThreadPriority",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 363   { "NoYieldsInMicrolock",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 364   { "BackEdgeThreshold",             JDK_Version::jdk(9), JDK_Version::jdk(10) },
 365   { "UseNewReflection",              JDK_Version::jdk(9), JDK_Version::jdk(10) },
 366   { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
 367   { "VerifyReflectionBytecodes",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 368   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 369   { "NmethodSweepFraction",          JDK_Version::jdk(9), JDK_Version::jdk(10) },
 370   { "NmethodSweepCheckInterval",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 371   { "CodeCacheMinimumFreeSpace",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 372 #ifndef ZERO
 373   { "UseFastAccessorMethods",        JDK_Version::jdk(9), JDK_Version::jdk(10) },
 374   { "UseFastEmptyMethods",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 375 #endif // ZERO
 376   { "UseCompilerSafepoints",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 377   { NULL, JDK_Version(0), JDK_Version(0) }
 378 };
 379 
 380 // When a flag is deprecated, it can be added to this list in order to issuing a warning when the flag is used.
 381 // Once the JDK version reaches the 'accept_until' limit, we flatly refuse to admit the existence of the flag.
 382 static SpecialFlag const deprecated_jvm_flags[] = {
 383   // deprecated non-alias flags:
 384   { "MaxGCMinorPauseMillis",        JDK_Version::jdk(8), JDK_Version::jdk(SpecialFlag::_removal_unscheduled) },
 385   { "UseParNewGC",                  JDK_Version::jdk(9), JDK_Version::jdk(10) },
 386   
 387   // deprecated alias flags (see also aliased_jvm_flags):
 388   { "DefaultMaxRAMFraction",        JDK_Version::jdk(8), JDK_Version::jdk(SpecialFlag::_removal_unscheduled) },
 389   { "CMSMarkStackSizeMax",          JDK_Version::jdk(9), JDK_Version::jdk(10) },
 390   { "CMSMarkStackSize",             JDK_Version::jdk(9), JDK_Version::jdk(10) },
 391   { "G1MarkStackSize",              JDK_Version::jdk(9), JDK_Version::jdk(10) },
 392   { "ParallelMarkingThreads",       JDK_Version::jdk(9), JDK_Version::jdk(10) },
 393   { "ParallelCMSThreads",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 394   { NULL, JDK_Version(0), JDK_Version(0) }
 395 };
 396 
 397 // Flags that are aliases for other flags.
 398 typedef struct {
 399   const char* alias_name;
 400   const char* real_name;
 401 } AliasedFlag;
 402 
 403 static AliasedFlag const aliased_jvm_flags[] = {
 404   { "DefaultMaxRAMFraction",    "MaxRAMFraction"    },
 405   { "CMSMarkStackSizeMax",      "MarkStackSizeMax"  },
 406   { "CMSMarkStackSize",         "MarkStackSize"     },
 407   { "G1MarkStackSize",          "MarkStackSize"     },
 408   { "ParallelMarkingThreads",   "ConcGCThreads"     },
 409   { "ParallelCMSThreads",       "ConcGCThreads"     },
 410   { NULL, NULL}
 411 };
 412 
 413 // Returns 1 if the flag is special and jdk version is in the range specified.
 414 //     In this case the 'version' buffer is filled in with the version number when 
 415 //     the flag became special.
 416 // Returns -1 if the flag is special and has expired (should be ignored).
 417 // Returns 0 if the flag is not special.
 418 static int is_special_flag(const SpecialFlag special_table[], const char *s, JDK_Version* version) {
 419   int i = 0;
 420   assert(version != NULL, "Must provide a version buffer");
 421   while (special_table[i].name != NULL) {
 422     const SpecialFlag& flag_status = special_table[i];
 423     // <flag>=xxx form
 424     // [-|+]<flag> form
 425     size_t len = strlen(flag_status.name);
 426     if (((strncmp(flag_status.name, s, len) == 0) &&
 427           (strlen(s) == len)) ||
 428          ((s[0] == '+' || s[0] == '-') &&
 429           (strncmp(flag_status.name, &s[1], len) == 0) &&
 430           (strlen(&s[1]) == len))) {
 431       if (!flag_status.is_removal_scheduled() ||
 432           JDK_Version::current().compare(flag_status.accept_until) == -1) {
 433         *version = flag_status.obsoleted_in;
 434         return 1;
 435       } else {
 436         return -1;
 437       }
 438     }
 439     i++;
 440   }
 441   return 0;
 442 }
 443 
 444 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 445   return (is_special_flag(obsolete_jvm_flags, s, version) == 1);
 446 }
 447 
 448 int Arguments::is_deprecated_flag(const char *s, JDK_Version* version) {
 449   return is_special_flag(deprecated_jvm_flags, s, version);
 450 }
 451 
 452 const char* Arguments::real_flag_name(const char *flag_name) {
 453   int i = 0;
 454   while (aliased_jvm_flags[i].alias_name != NULL) {
 455     const AliasedFlag& flag_status = aliased_jvm_flags[i];
 456     size_t len = strlen(flag_status.alias_name);
 457     if (((strncmp(flag_status.alias_name, flag_name, len) == 0) &&
 458          (strlen(flag_name) == len))) {
 459         return flag_status.real_name;
 460     }
 461     i++;
 462   }
 463   return flag_name;
 464 }
 465 
 466 // Constructs the system class path (aka boot class path) from the following
 467 // components, in order:
 468 //
 469 //     prefix           // from -Xbootclasspath/p:...
 470 //     base             // from os::get_system_properties() or -Xbootclasspath=
 471 //     suffix           // from -Xbootclasspath/a:...
 472 //
 473 // This could be AllStatic, but it isn't needed after argument processing is
 474 // complete.
 475 class SysClassPath: public StackObj {
 476 public:
 477   SysClassPath(const char* base);
 478   ~SysClassPath();
 479 
 480   inline void set_base(const char* base);
 481   inline void add_prefix(const char* prefix);
 482   inline void add_suffix_to_prefix(const char* suffix);
 483   inline void add_suffix(const char* suffix);
 484   inline void reset_path(const char* base);
 485 
 486   inline const char* get_base()     const { return _items[_scp_base]; }
 487   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 488   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 489 
 490   // Combine all the components into a single c-heap-allocated string; caller
 491   // must free the string if/when no longer needed.
 492   char* combined_path();
 493 
 494 private:
 495   // Utility routines.
 496   static char* add_to_path(const char* path, const char* str, bool prepend);
 497   static char* add_jars_to_path(char* path, const char* directory);
 498 
 499   inline void reset_item_at(int index);
 500 
 501   // Array indices for the items that make up the sysclasspath.  All except the
 502   // base are allocated in the C heap and freed by this class.
 503   enum {
 504     _scp_prefix,        // from -Xbootclasspath/p:...
 505     _scp_base,          // the default sysclasspath
 506     _scp_suffix,        // from -Xbootclasspath/a:...
 507     _scp_nitems         // the number of items, must be last.
 508   };
 509 
 510   const char* _items[_scp_nitems];
 511 };
 512 
 513 SysClassPath::SysClassPath(const char* base) {
 514   memset(_items, 0, sizeof(_items));
 515   _items[_scp_base] = base;
 516 }
 517 
 518 SysClassPath::~SysClassPath() {
 519   // Free everything except the base.
 520   for (int i = 0; i < _scp_nitems; ++i) {
 521     if (i != _scp_base) reset_item_at(i);
 522   }
 523 }
 524 
 525 inline void SysClassPath::set_base(const char* base) {
 526   _items[_scp_base] = base;
 527 }
 528 
 529 inline void SysClassPath::add_prefix(const char* prefix) {
 530   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 531 }
 532 
 533 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 534   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 535 }
 536 
 537 inline void SysClassPath::add_suffix(const char* suffix) {
 538   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 539 }
 540 
 541 inline void SysClassPath::reset_item_at(int index) {
 542   assert(index < _scp_nitems && index != _scp_base, "just checking");
 543   if (_items[index] != NULL) {
 544     FREE_C_HEAP_ARRAY(char, _items[index]);
 545     _items[index] = NULL;
 546   }
 547 }
 548 
 549 inline void SysClassPath::reset_path(const char* base) {
 550   // Clear the prefix and suffix.
 551   reset_item_at(_scp_prefix);
 552   reset_item_at(_scp_suffix);
 553   set_base(base);
 554 }
 555 
 556 //------------------------------------------------------------------------------
 557 
 558 
 559 // Combine the bootclasspath elements, some of which may be null, into a single
 560 // c-heap-allocated string.
 561 char* SysClassPath::combined_path() {
 562   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 563 
 564   size_t lengths[_scp_nitems];
 565   size_t total_len = 0;
 566 
 567   const char separator = *os::path_separator();
 568 
 569   // Get the lengths.
 570   int i;
 571   for (i = 0; i < _scp_nitems; ++i) {
 572     if (_items[i] != NULL) {
 573       lengths[i] = strlen(_items[i]);
 574       // Include space for the separator char (or a NULL for the last item).
 575       total_len += lengths[i] + 1;
 576     }
 577   }
 578   assert(total_len > 0, "empty sysclasspath not allowed");
 579 
 580   // Copy the _items to a single string.
 581   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 582   char* cp_tmp = cp;
 583   for (i = 0; i < _scp_nitems; ++i) {
 584     if (_items[i] != NULL) {
 585       memcpy(cp_tmp, _items[i], lengths[i]);
 586       cp_tmp += lengths[i];
 587       *cp_tmp++ = separator;
 588     }
 589   }
 590   *--cp_tmp = '\0';     // Replace the extra separator.
 591   return cp;
 592 }
 593 
 594 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 595 char*
 596 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 597   char *cp;
 598 
 599   assert(str != NULL, "just checking");
 600   if (path == NULL) {
 601     size_t len = strlen(str) + 1;
 602     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 603     memcpy(cp, str, len);                       // copy the trailing null
 604   } else {
 605     const char separator = *os::path_separator();
 606     size_t old_len = strlen(path);
 607     size_t str_len = strlen(str);
 608     size_t len = old_len + str_len + 2;
 609 
 610     if (prepend) {
 611       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 612       char* cp_tmp = cp;
 613       memcpy(cp_tmp, str, str_len);
 614       cp_tmp += str_len;
 615       *cp_tmp = separator;
 616       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 617       FREE_C_HEAP_ARRAY(char, path);
 618     } else {
 619       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 620       char* cp_tmp = cp + old_len;
 621       *cp_tmp = separator;
 622       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 623     }
 624   }
 625   return cp;
 626 }
 627 
 628 // Scan the directory and append any jar or zip files found to path.
 629 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 630 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 631   DIR* dir = os::opendir(directory);
 632   if (dir == NULL) return path;
 633 
 634   char dir_sep[2] = { '\0', '\0' };
 635   size_t directory_len = strlen(directory);
 636   const char fileSep = *os::file_separator();
 637   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 638 
 639   /* Scan the directory for jars/zips, appending them to path. */
 640   struct dirent *entry;
 641   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 642   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 643     const char* name = entry->d_name;
 644     const char* ext = name + strlen(name) - 4;
 645     bool isJarOrZip = ext > name &&
 646       (os::file_name_strcmp(ext, ".jar") == 0 ||
 647        os::file_name_strcmp(ext, ".zip") == 0);
 648     if (isJarOrZip) {
 649       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 650       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 651       path = add_to_path(path, jarpath, false);
 652       FREE_C_HEAP_ARRAY(char, jarpath);
 653     }
 654   }
 655   FREE_C_HEAP_ARRAY(char, dbuf);
 656   os::closedir(dir);
 657   return path;
 658 }
 659 
 660 // Parses a memory size specification string.
 661 static bool atomull(const char *s, julong* result) {
 662   julong n = 0;
 663   int args_read = 0;
 664   bool is_hex = false;
 665   // Skip leading 0[xX] for hexadecimal
 666   if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
 667     s += 2;
 668     is_hex = true;
 669     args_read = sscanf(s, JULONG_FORMAT_X, &n);
 670   } else {
 671     args_read = sscanf(s, JULONG_FORMAT, &n);
 672   }
 673   if (args_read != 1) {
 674     return false;
 675   }
 676   while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
 677     s++;
 678   }
 679   // 4705540: illegal if more characters are found after the first non-digit
 680   if (strlen(s) > 1) {
 681     return false;
 682   }
 683   switch (*s) {
 684     case 'T': case 't':
 685       *result = n * G * K;
 686       // Check for overflow.
 687       if (*result/((julong)G * K) != n) return false;
 688       return true;
 689     case 'G': case 'g':
 690       *result = n * G;
 691       if (*result/G != n) return false;
 692       return true;
 693     case 'M': case 'm':
 694       *result = n * M;
 695       if (*result/M != n) return false;
 696       return true;
 697     case 'K': case 'k':
 698       *result = n * K;
 699       if (*result/K != n) return false;
 700       return true;
 701     case '\0':
 702       *result = n;
 703       return true;
 704     default:
 705       return false;
 706   }
 707 }
 708 
 709 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 710   if (size < min_size) return arg_too_small;
 711   // Check that size will fit in a size_t (only relevant on 32-bit)
 712   if (size > max_uintx) return arg_too_big;
 713   return arg_in_range;
 714 }
 715 
 716 // Describe an argument out of range error
 717 void Arguments::describe_range_error(ArgsRange errcode) {
 718   switch(errcode) {
 719   case arg_too_big:
 720     jio_fprintf(defaultStream::error_stream(),
 721                 "The specified size exceeds the maximum "
 722                 "representable size.\n");
 723     break;
 724   case arg_too_small:
 725   case arg_unreadable:
 726   case arg_in_range:
 727     // do nothing for now
 728     break;
 729   default:
 730     ShouldNotReachHere();
 731   }
 732 }
 733 
 734 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
 735   return CommandLineFlags::boolAtPut(name, &value, origin);
 736 }
 737 
 738 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
 739   double v;
 740   if (sscanf(value, "%lf", &v) != 1) {
 741     return false;
 742   }
 743 
 744   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 745     return true;
 746   }
 747   return false;
 748 }
 749 
 750 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
 751   julong v;
 752   intx intx_v;
 753   bool is_neg = false;
 754   // Check the sign first since atomull() parses only unsigned values.
 755   if (*value == '-') {
 756     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 757       return false;
 758     }
 759     value++;
 760     is_neg = true;
 761   }
 762   if (!atomull(value, &v)) {
 763     return false;
 764   }
 765   intx_v = (intx) v;
 766   if (is_neg) {
 767     intx_v = -intx_v;
 768   }
 769   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 770     return true;
 771   }
 772   uintx uintx_v = (uintx) v;
 773   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 774     return true;
 775   }
 776   uint64_t uint64_t_v = (uint64_t) v;
 777   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 778     return true;
 779   }
 780   size_t size_t_v = (size_t) v;
 781   if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
 782     return true;
 783   }
 784   return false;
 785 }
 786 
 787 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
 788   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 789   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 790   FREE_C_HEAP_ARRAY(char, value);
 791   return true;
 792 }
 793 
 794 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
 795   const char* old_value = "";
 796   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 797   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 798   size_t new_len = strlen(new_value);
 799   const char* value;
 800   char* free_this_too = NULL;
 801   if (old_len == 0) {
 802     value = new_value;
 803   } else if (new_len == 0) {
 804     value = old_value;
 805   } else {
 806     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 807     // each new setting adds another LINE to the switch:
 808     sprintf(buf, "%s\n%s", old_value, new_value);
 809     value = buf;
 810     free_this_too = buf;
 811   }
 812   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 813   // CommandLineFlags always returns a pointer that needs freeing.
 814   FREE_C_HEAP_ARRAY(char, value);
 815   if (free_this_too != NULL) {
 816     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 817     FREE_C_HEAP_ARRAY(char, free_this_too);
 818   }
 819   return true;
 820 }
 821 
 822 const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
 823   const char* real_name = real_flag_name(arg);
 824   JDK_Version since = JDK_Version();
 825   switch (is_deprecated_flag(arg, &since)) {
 826     case -1:
 827       return NULL;
 828     case 0:
 829       return real_name;
 830     case 1: {
 831       char version[256];
 832       since.to_string(version, sizeof(version));
 833       if (real_name != arg) {
 834         warning("option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
 835                 arg, version, real_name);
 836       } else {
 837         warning("option %s was deprecated in version %s and will likely be removed in a future release.",
 838                 arg, version);
 839       }
 840       return real_name;
 841     }
 842   }
 843   ShouldNotReachHere();
 844   return NULL;
 845 }
 846 
 847 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 848 
 849   // range of acceptable characters spelled out for portability reasons
 850 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 851 #define BUFLEN 255
 852   char name[BUFLEN+1];
 853   char dummy;
 854   const char* real_name;
 855   
 856   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 857     real_name = handle_aliases_and_deprecation(name);
 858     if (real_name == NULL) {
 859       return NULL; // "name" is a deprecated option that has expired.
 860     }
 861     return set_bool_flag(real_name, false, origin);
 862   }
 863   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 864     real_name = handle_aliases_and_deprecation(name);
 865     if (real_name == NULL) {
 866       return NULL;
 867     }
 868     return set_bool_flag(real_name, true, origin);
 869   }
 870 
 871   char punct;
 872   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 873     const char* value = strchr(arg, '=') + 1;
 874     Flag* flag;
 875     
 876     real_name = handle_aliases_and_deprecation(name);
 877     if (real_name == NULL) {
 878       return NULL;
 879     }
 880     flag = Flag::find_flag(real_name, strlen(real_name));
 881     if (flag != NULL && flag->is_ccstr()) {
 882       if (flag->ccstr_accumulates()) {
 883         return append_to_string_flag(real_name, value, origin);
 884       } else {
 885         if (value[0] == '\0') {
 886           value = NULL;
 887         }
 888         return set_string_flag(real_name, value, origin);
 889       }
 890     }
 891   }
 892 
 893   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 894     const char* value = strchr(arg, '=') + 1;
 895     // -XX:Foo:=xxx will reset the string flag to the given value.
 896     if (value[0] == '\0') {
 897       value = NULL;
 898     }
 899     real_name = handle_aliases_and_deprecation(name);
 900     if (real_name == NULL) {
 901       return NULL;
 902     }
 903     return set_string_flag(real_name, value, origin);
 904   }
 905 
 906 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 907 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 908 #define        NUMBER_RANGE    "[0123456789]"
 909   char value[BUFLEN + 1];
 910   char value2[BUFLEN + 1];
 911   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 912     // Looks like a floating-point number -- try again with more lenient format string
 913     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 914       real_name = handle_aliases_and_deprecation(name);
 915       if (real_name == NULL) {
 916         return NULL;
 917       }
 918       return set_fp_numeric_flag(real_name, value, origin);
 919     }
 920   }
 921 
 922 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 923   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 924     real_name = handle_aliases_and_deprecation(name);
 925     if (real_name == NULL) {
 926       return NULL;
 927     }
 928     return set_numeric_flag(real_name, value, origin);
 929   }
 930 
 931   return false;
 932 }
 933 
 934 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 935   assert(bldarray != NULL, "illegal argument");
 936 
 937   if (arg == NULL) {
 938     return;
 939   }
 940 
 941   int new_count = *count + 1;
 942 
 943   // expand the array and add arg to the last element
 944   if (*bldarray == NULL) {
 945     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 946   } else {
 947     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 948   }
 949   (*bldarray)[*count] = os::strdup_check_oom(arg);
 950   *count = new_count;
 951 }
 952 
 953 void Arguments::build_jvm_args(const char* arg) {
 954   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 955 }
 956 
 957 void Arguments::build_jvm_flags(const char* arg) {
 958   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 959 }
 960 
 961 // utility function to return a string that concatenates all
 962 // strings in a given char** array
 963 const char* Arguments::build_resource_string(char** args, int count) {
 964   if (args == NULL || count == 0) {
 965     return NULL;
 966   }
 967   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 968   for (int i = 1; i < count; i++) {
 969     length += strlen(args[i]) + 1; // add 1 for a space
 970   }
 971   char* s = NEW_RESOURCE_ARRAY(char, length);
 972   strcpy(s, args[0]);
 973   for (int j = 1; j < count; j++) {
 974     strcat(s, " ");
 975     strcat(s, args[j]);
 976   }
 977   return (const char*) s;
 978 }
 979 
 980 void Arguments::print_on(outputStream* st) {
 981   st->print_cr("VM Arguments:");
 982   if (num_jvm_flags() > 0) {
 983     st->print("jvm_flags: "); print_jvm_flags_on(st);
 984   }
 985   if (num_jvm_args() > 0) {
 986     st->print("jvm_args: "); print_jvm_args_on(st);
 987   }
 988   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 989   if (_java_class_path != NULL) {
 990     char* path = _java_class_path->value();
 991     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 992   }
 993   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 994 }
 995 
 996 void Arguments::print_jvm_flags_on(outputStream* st) {
 997   if (_num_jvm_flags > 0) {
 998     for (int i=0; i < _num_jvm_flags; i++) {
 999       st->print("%s ", _jvm_flags_array[i]);
1000     }
1001     st->cr();
1002   }
1003 }
1004 
1005 void Arguments::print_jvm_args_on(outputStream* st) {
1006   if (_num_jvm_args > 0) {
1007     for (int i=0; i < _num_jvm_args; i++) {
1008       st->print("%s ", _jvm_args_array[i]);
1009     }
1010     st->cr();
1011   }
1012 }
1013 
1014 bool Arguments::process_argument(const char* arg,
1015     jboolean ignore_unrecognized, Flag::Flags origin) {
1016 
1017   JDK_Version since = JDK_Version();
1018 
1019   if (parse_argument(arg, origin) || ignore_unrecognized) {
1020     return true;
1021   }
1022 
1023   bool has_plus_minus = (*arg == '+' || *arg == '-');
1024   const char* const argname = has_plus_minus ? arg + 1 : arg;
1025   if (is_newly_obsolete(arg, &since)) {
1026     char version[256];
1027     since.to_string(version, sizeof(version));
1028     warning("ignoring option %s; support was removed in %s", argname, version);
1029     return true;
1030   }
1031 
1032   // For locked flags, report a custom error message if available.
1033   // Otherwise, report the standard unrecognized VM option.
1034 
1035   size_t arg_len;
1036   const char* equal_sign = strchr(argname, '=');
1037   if (equal_sign == NULL) {
1038     arg_len = strlen(argname);
1039   } else {
1040     arg_len = equal_sign - argname;
1041   }
1042 
1043   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1044   if (found_flag != NULL) {
1045     char locked_message_buf[BUFLEN];
1046     found_flag->get_locked_message(locked_message_buf, BUFLEN);
1047     if (strlen(locked_message_buf) == 0) {
1048       if (found_flag->is_bool() && !has_plus_minus) {
1049         jio_fprintf(defaultStream::error_stream(),
1050           "Missing +/- setting for VM option '%s'\n", argname);
1051       } else if (!found_flag->is_bool() && has_plus_minus) {
1052         jio_fprintf(defaultStream::error_stream(),
1053           "Unexpected +/- setting in VM option '%s'\n", argname);
1054       } else {
1055         jio_fprintf(defaultStream::error_stream(),
1056           "Improperly specified VM option '%s'\n", argname);
1057       }
1058     } else {
1059       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1060     }
1061   } else {
1062     jio_fprintf(defaultStream::error_stream(),
1063                 "Unrecognized VM option '%s'\n", argname);
1064     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1065     if (fuzzy_matched != NULL) {
1066       jio_fprintf(defaultStream::error_stream(),
1067                   "Did you mean '%s%s%s'? ",
1068                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1069                   fuzzy_matched->_name,
1070                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
1071       if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
1072         char version[256];
1073         since.to_string(version, sizeof(version));
1074         jio_fprintf(defaultStream::error_stream(),
1075                     "Warning: support for %s was removed in %s\n",
1076                     fuzzy_matched->_name,
1077                     version);
1078     }
1079   }
1080   }
1081 
1082   // allow for commandline "commenting out" options like -XX:#+Verbose
1083   return arg[0] == '#';
1084 }
1085 
1086 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1087   FILE* stream = fopen(file_name, "rb");
1088   if (stream == NULL) {
1089     if (should_exist) {
1090       jio_fprintf(defaultStream::error_stream(),
1091                   "Could not open settings file %s\n", file_name);
1092       return false;
1093     } else {
1094       return true;
1095     }
1096   }
1097 
1098   char token[1024];
1099   int  pos = 0;
1100 
1101   bool in_white_space = true;
1102   bool in_comment     = false;
1103   bool in_quote       = false;
1104   char quote_c        = 0;
1105   bool result         = true;
1106 
1107   int c = getc(stream);
1108   while(c != EOF && pos < (int)(sizeof(token)-1)) {
1109     if (in_white_space) {
1110       if (in_comment) {
1111         if (c == '\n') in_comment = false;
1112       } else {
1113         if (c == '#') in_comment = true;
1114         else if (!isspace(c)) {
1115           in_white_space = false;
1116           token[pos++] = c;
1117         }
1118       }
1119     } else {
1120       if (c == '\n' || (!in_quote && isspace(c))) {
1121         // token ends at newline, or at unquoted whitespace
1122         // this allows a way to include spaces in string-valued options
1123         token[pos] = '\0';
1124         logOption(token);
1125         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1126         build_jvm_flags(token);
1127         pos = 0;
1128         in_white_space = true;
1129         in_quote = false;
1130       } else if (!in_quote && (c == '\'' || c == '"')) {
1131         in_quote = true;
1132         quote_c = c;
1133       } else if (in_quote && (c == quote_c)) {
1134         in_quote = false;
1135       } else {
1136         token[pos++] = c;
1137       }
1138     }
1139     c = getc(stream);
1140   }
1141   if (pos > 0) {
1142     token[pos] = '\0';
1143     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1144     build_jvm_flags(token);
1145   }
1146   fclose(stream);
1147   return result;
1148 }
1149 
1150 //=============================================================================================================
1151 // Parsing of properties (-D)
1152 
1153 const char* Arguments::get_property(const char* key) {
1154   return PropertyList_get_value(system_properties(), key);
1155 }
1156 
1157 bool Arguments::add_property(const char* prop) {
1158   const char* eq = strchr(prop, '=');
1159   char* key;
1160   // ns must be static--its address may be stored in a SystemProperty object.
1161   const static char ns[1] = {0};
1162   char* value = (char *)ns;
1163 
1164   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1165   key = AllocateHeap(key_len + 1, mtInternal);
1166   strncpy(key, prop, key_len);
1167   key[key_len] = '\0';
1168 
1169   if (eq != NULL) {
1170     size_t value_len = strlen(prop) - key_len - 1;
1171     value = AllocateHeap(value_len + 1, mtInternal);
1172     strncpy(value, &prop[key_len + 1], value_len + 1);
1173   }
1174 
1175   if (strcmp(key, "java.compiler") == 0) {
1176     process_java_compiler_argument(value);
1177     FreeHeap(key);
1178     if (eq != NULL) {
1179       FreeHeap(value);
1180     }
1181     return true;
1182   } else if (strcmp(key, "sun.java.command") == 0) {
1183     _java_command = value;
1184 
1185     // Record value in Arguments, but let it get passed to Java.
1186   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1187              strcmp(key, "sun.java.launcher.pid") == 0) {
1188     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1189     // private and are processed in process_sun_java_launcher_properties();
1190     // the sun.java.launcher property is passed on to the java application
1191     FreeHeap(key);
1192     if (eq != NULL) {
1193       FreeHeap(value);
1194     }
1195     return true;
1196   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1197     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1198     // its value without going through the property list or making a Java call.
1199     _java_vendor_url_bug = value;
1200   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1201     PropertyList_unique_add(&_system_properties, key, value, true);
1202     return true;
1203   }
1204   // Create new property and add at the end of the list
1205   PropertyList_unique_add(&_system_properties, key, value);
1206   return true;
1207 }
1208 
1209 //===========================================================================================================
1210 // Setting int/mixed/comp mode flags
1211 
1212 void Arguments::set_mode_flags(Mode mode) {
1213   // Set up default values for all flags.
1214   // If you add a flag to any of the branches below,
1215   // add a default value for it here.
1216   set_java_compiler(false);
1217   _mode                      = mode;
1218 
1219   // Ensure Agent_OnLoad has the correct initial values.
1220   // This may not be the final mode; mode may change later in onload phase.
1221   PropertyList_unique_add(&_system_properties, "java.vm.info",
1222                           (char*)VM_Version::vm_info_string(), false);
1223 
1224   UseInterpreter             = true;
1225   UseCompiler                = true;
1226   UseLoopCounter             = true;
1227 
1228   // Default values may be platform/compiler dependent -
1229   // use the saved values
1230   ClipInlining               = Arguments::_ClipInlining;
1231   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1232   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1233   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1234 
1235   // Change from defaults based on mode
1236   switch (mode) {
1237   default:
1238     ShouldNotReachHere();
1239     break;
1240   case _int:
1241     UseCompiler              = false;
1242     UseLoopCounter           = false;
1243     AlwaysCompileLoopMethods = false;
1244     UseOnStackReplacement    = false;
1245     break;
1246   case _mixed:
1247     // same as default
1248     break;
1249   case _comp:
1250     UseInterpreter           = false;
1251     BackgroundCompilation    = false;
1252     ClipInlining             = false;
1253     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1254     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1255     // compile a level 4 (C2) and then continue executing it.
1256     if (TieredCompilation) {
1257       Tier3InvokeNotifyFreqLog = 0;
1258       Tier4InvocationThreshold = 0;
1259     }
1260     break;
1261   }
1262 }
1263 
1264 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1265 // Conflict: required to use shared spaces (-Xshare:on), but
1266 // incompatible command line options were chosen.
1267 
1268 static void no_shared_spaces(const char* message) {
1269   if (RequireSharedSpaces) {
1270     jio_fprintf(defaultStream::error_stream(),
1271       "Class data sharing is inconsistent with other specified options.\n");
1272     vm_exit_during_initialization("Unable to use shared archive.", message);
1273   } else {
1274     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1275   }
1276 }
1277 #endif
1278 
1279 // Returns threshold scaled with CompileThresholdScaling
1280 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1281   return (intx)(threshold * CompileThresholdScaling);
1282 }
1283 
1284 // Returns freq_log scaled with CompileThresholdScaling
1285 intx Arguments::get_scaled_freq_log(intx freq_log) {
1286   intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1287   if (scaled_freq == 0) {
1288     return 0;
1289   } else {
1290     return log2_intptr(scaled_freq);
1291   }
1292 }
1293 
1294 void Arguments::set_tiered_flags() {
1295   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1296   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1297     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1298   }
1299   if (CompilationPolicyChoice < 2) {
1300     vm_exit_during_initialization(
1301       "Incompatible compilation policy selected", NULL);
1302   }
1303   // Increase the code cache size - tiered compiles a lot more.
1304   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1305     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1306   }
1307   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1308   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1309     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1310 
1311     if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1312       // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1313       if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1314         FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1315       }
1316       if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1317         FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1318       }
1319       // Check consistency of code heap sizes
1320       if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1321         jio_fprintf(defaultStream::error_stream(),
1322                     "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1323                     NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1324                     (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1325         vm_exit(1);
1326       }
1327     }
1328   }
1329   if (!UseInterpreter) { // -Xcomp
1330     Tier3InvokeNotifyFreqLog = 0;
1331     Tier4InvocationThreshold = 0;
1332   }
1333   // Scale tiered compilation thresholds
1334   if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1335     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1336     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1337 
1338     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1339     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1340     FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1341     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1342 
1343     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1344     // once these thresholds become supported.
1345 
1346     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1347     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1348 
1349     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1350     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1351 
1352     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1353 
1354     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1355     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1356     FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1357     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1358   }
1359 }
1360 
1361 /**
1362  * Returns the minimum number of compiler threads needed to run the JVM. The following
1363  * configurations are possible.
1364  *
1365  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1366  *    compiler threads is 0.
1367  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1368  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1369  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1370  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1371  *    C1 can be used, so the minimum number of compiler threads is 1.
1372  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1373  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1374  *    the minimum number of compiler threads is 2.
1375  */
1376 int Arguments::get_min_number_of_compiler_threads() {
1377 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1378   return 0;   // case 1
1379 #else
1380   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1381     return 1; // case 2 or case 3
1382   }
1383   return 2;   // case 4 (tiered)
1384 #endif
1385 }
1386 
1387 #if INCLUDE_ALL_GCS
1388 static void disable_adaptive_size_policy(const char* collector_name) {
1389   if (UseAdaptiveSizePolicy) {
1390     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1391       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1392               collector_name);
1393     }
1394     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1395   }
1396 }
1397 
1398 void Arguments::set_parnew_gc_flags() {
1399   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1400          "control point invariant");
1401   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1402   assert(UseParNewGC, "ParNew should always be used with CMS");
1403 
1404   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1405     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1406     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1407   } else if (ParallelGCThreads == 0) {
1408     jio_fprintf(defaultStream::error_stream(),
1409         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1410     vm_exit(1);
1411   }
1412 
1413   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1414   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1415   // we set them to 1024 and 1024.
1416   // See CR 6362902.
1417   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1418     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1419   }
1420   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1421     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1422   }
1423 
1424   // When using compressed oops, we use local overflow stacks,
1425   // rather than using a global overflow list chained through
1426   // the klass word of the object's pre-image.
1427   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1428     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1429       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1430     }
1431     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1432   }
1433   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1434 }
1435 
1436 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1437 // sparc/solaris for certain applications, but would gain from
1438 // further optimization and tuning efforts, and would almost
1439 // certainly gain from analysis of platform and environment.
1440 void Arguments::set_cms_and_parnew_gc_flags() {
1441   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1442   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1443   assert(UseParNewGC, "ParNew should always be used with CMS");
1444 
1445   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1446   disable_adaptive_size_policy("UseConcMarkSweepGC");
1447 
1448   set_parnew_gc_flags();
1449 
1450   size_t max_heap = align_size_down(MaxHeapSize,
1451                                     CardTableRS::ct_max_alignment_constraint());
1452 
1453   // Now make adjustments for CMS
1454   intx   tenuring_default = (intx)6;
1455   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1456 
1457   // Preferred young gen size for "short" pauses:
1458   // upper bound depends on # of threads and NewRatio.
1459   const uintx parallel_gc_threads =
1460     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1461   const size_t preferred_max_new_size_unaligned =
1462     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1463   size_t preferred_max_new_size =
1464     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1465 
1466   // Unless explicitly requested otherwise, size young gen
1467   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1468 
1469   // If either MaxNewSize or NewRatio is set on the command line,
1470   // assume the user is trying to set the size of the young gen.
1471   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1472 
1473     // Set MaxNewSize to our calculated preferred_max_new_size unless
1474     // NewSize was set on the command line and it is larger than
1475     // preferred_max_new_size.
1476     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1477       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1478     } else {
1479       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1480     }
1481     if (PrintGCDetails && Verbose) {
1482       // Too early to use gclog_or_tty
1483       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1484     }
1485 
1486     // Code along this path potentially sets NewSize and OldSize
1487     if (PrintGCDetails && Verbose) {
1488       // Too early to use gclog_or_tty
1489       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1490            " initial_heap_size:  " SIZE_FORMAT
1491            " max_heap: " SIZE_FORMAT,
1492            min_heap_size(), InitialHeapSize, max_heap);
1493     }
1494     size_t min_new = preferred_max_new_size;
1495     if (FLAG_IS_CMDLINE(NewSize)) {
1496       min_new = NewSize;
1497     }
1498     if (max_heap > min_new && min_heap_size() > min_new) {
1499       // Unless explicitly requested otherwise, make young gen
1500       // at least min_new, and at most preferred_max_new_size.
1501       if (FLAG_IS_DEFAULT(NewSize)) {
1502         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1503         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1504         if (PrintGCDetails && Verbose) {
1505           // Too early to use gclog_or_tty
1506           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1507         }
1508       }
1509       // Unless explicitly requested otherwise, size old gen
1510       // so it's NewRatio x of NewSize.
1511       if (FLAG_IS_DEFAULT(OldSize)) {
1512         if (max_heap > NewSize) {
1513           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1514           if (PrintGCDetails && Verbose) {
1515             // Too early to use gclog_or_tty
1516             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1517           }
1518         }
1519       }
1520     }
1521   }
1522   // Unless explicitly requested otherwise, definitely
1523   // promote all objects surviving "tenuring_default" scavenges.
1524   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1525       FLAG_IS_DEFAULT(SurvivorRatio)) {
1526     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1527   }
1528   // If we decided above (or user explicitly requested)
1529   // `promote all' (via MaxTenuringThreshold := 0),
1530   // prefer minuscule survivor spaces so as not to waste
1531   // space for (non-existent) survivors
1532   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1533     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1534   }
1535 
1536   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1537   // but rather the number of free blocks of a given size that are used when
1538   // replenishing the local per-worker free list caches.
1539   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1540     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1541       // OldPLAB sizing manually turned off: Use a larger default setting,
1542       // unless it was manually specified. This is because a too-low value
1543       // will slow down scavenges.
1544       FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1545     } else {
1546       FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1547     }
1548   }
1549 
1550   // If either of the static initialization defaults have changed, note this
1551   // modification.
1552   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1553     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1554   }
1555   if (PrintGCDetails && Verbose) {
1556     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1557       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1558     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1559   }
1560 }
1561 #endif // INCLUDE_ALL_GCS
1562 
1563 void set_object_alignment() {
1564   // Object alignment.
1565   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1566   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1567   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1568   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1569   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1570   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1571 
1572   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1573   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1574 
1575   // Oop encoding heap max
1576   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1577 
1578 #if INCLUDE_ALL_GCS
1579   // Set CMS global values
1580   CompactibleFreeListSpace::set_cms_values();
1581 #endif // INCLUDE_ALL_GCS
1582 }
1583 
1584 bool verify_object_alignment() {
1585   // Object alignment.
1586   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1587     jio_fprintf(defaultStream::error_stream(),
1588                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1589                 (int)ObjectAlignmentInBytes);
1590     return false;
1591   }
1592   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1593     jio_fprintf(defaultStream::error_stream(),
1594                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1595                 (int)ObjectAlignmentInBytes, BytesPerLong);
1596     return false;
1597   }
1598   // It does not make sense to have big object alignment
1599   // since a space lost due to alignment will be greater
1600   // then a saved space from compressed oops.
1601   if ((int)ObjectAlignmentInBytes > 256) {
1602     jio_fprintf(defaultStream::error_stream(),
1603                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1604                 (int)ObjectAlignmentInBytes);
1605     return false;
1606   }
1607   // In case page size is very small.
1608   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1609     jio_fprintf(defaultStream::error_stream(),
1610                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1611                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1612     return false;
1613   }
1614   if(SurvivorAlignmentInBytes == 0) {
1615     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1616   } else {
1617     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1618       jio_fprintf(defaultStream::error_stream(),
1619             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1620             (int)SurvivorAlignmentInBytes);
1621       return false;
1622     }
1623     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1624       jio_fprintf(defaultStream::error_stream(),
1625           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1626           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1627       return false;
1628     }
1629   }
1630   return true;
1631 }
1632 
1633 size_t Arguments::max_heap_for_compressed_oops() {
1634   // Avoid sign flip.
1635   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1636   // We need to fit both the NULL page and the heap into the memory budget, while
1637   // keeping alignment constraints of the heap. To guarantee the latter, as the
1638   // NULL page is located before the heap, we pad the NULL page to the conservative
1639   // maximum alignment that the GC may ever impose upon the heap.
1640   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1641                                                         _conservative_max_heap_alignment);
1642 
1643   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1644   NOT_LP64(ShouldNotReachHere(); return 0);
1645 }
1646 
1647 bool Arguments::should_auto_select_low_pause_collector() {
1648   if (UseAutoGCSelectPolicy &&
1649       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1650       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1651     if (PrintGCDetails) {
1652       // Cannot use gclog_or_tty yet.
1653       tty->print_cr("Automatic selection of the low pause collector"
1654        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1655     }
1656     return true;
1657   }
1658   return false;
1659 }
1660 
1661 void Arguments::set_use_compressed_oops() {
1662 #ifndef ZERO
1663 #ifdef _LP64
1664   // MaxHeapSize is not set up properly at this point, but
1665   // the only value that can override MaxHeapSize if we are
1666   // to use UseCompressedOops is InitialHeapSize.
1667   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1668 
1669   if (max_heap_size <= max_heap_for_compressed_oops()) {
1670 #if !defined(COMPILER1) || defined(TIERED)
1671     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1672       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1673     }
1674 #endif
1675   } else {
1676     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1677       warning("Max heap size too large for Compressed Oops");
1678       FLAG_SET_DEFAULT(UseCompressedOops, false);
1679       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1680     }
1681   }
1682 #endif // _LP64
1683 #endif // ZERO
1684 }
1685 
1686 
1687 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1688 // set_use_compressed_oops().
1689 void Arguments::set_use_compressed_klass_ptrs() {
1690 #ifndef ZERO
1691 #ifdef _LP64
1692   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1693   if (!UseCompressedOops) {
1694     if (UseCompressedClassPointers) {
1695       warning("UseCompressedClassPointers requires UseCompressedOops");
1696     }
1697     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1698   } else {
1699     // Turn on UseCompressedClassPointers too
1700     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1701       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1702     }
1703     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1704     if (UseCompressedClassPointers) {
1705       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1706         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1707         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1708       }
1709     }
1710   }
1711 #endif // _LP64
1712 #endif // !ZERO
1713 }
1714 
1715 void Arguments::set_conservative_max_heap_alignment() {
1716   // The conservative maximum required alignment for the heap is the maximum of
1717   // the alignments imposed by several sources: any requirements from the heap
1718   // itself, the collector policy and the maximum page size we may run the VM
1719   // with.
1720   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1721 #if INCLUDE_ALL_GCS
1722   if (UseParallelGC) {
1723     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1724   } else if (UseG1GC) {
1725     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1726   }
1727 #endif // INCLUDE_ALL_GCS
1728   _conservative_max_heap_alignment = MAX4(heap_alignment,
1729                                           (size_t)os::vm_allocation_granularity(),
1730                                           os::max_page_size(),
1731                                           CollectorPolicy::compute_heap_alignment());
1732 }
1733 
1734 void Arguments::select_gc_ergonomically() {
1735   if (os::is_server_class_machine()) {
1736     if (should_auto_select_low_pause_collector()) {
1737       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1738     } else {
1739       FLAG_SET_ERGO(bool, UseParallelGC, true);
1740     }
1741   }
1742 }
1743 
1744 void Arguments::select_gc() {
1745   if (!gc_selected()) {
1746     ArgumentsExt::select_gc_ergonomically();
1747   }
1748 }
1749 
1750 void Arguments::set_ergonomics_flags() {
1751   select_gc();
1752 
1753 #ifdef COMPILER2
1754   // Shared spaces work fine with other GCs but causes bytecode rewriting
1755   // to be disabled, which hurts interpreter performance and decreases
1756   // server performance.  When -server is specified, keep the default off
1757   // unless it is asked for.  Future work: either add bytecode rewriting
1758   // at link time, or rewrite bytecodes in non-shared methods.
1759   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1760       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1761     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1762   }
1763 #endif
1764 
1765   set_conservative_max_heap_alignment();
1766 
1767 #ifndef ZERO
1768 #ifdef _LP64
1769   set_use_compressed_oops();
1770 
1771   // set_use_compressed_klass_ptrs() must be called after calling
1772   // set_use_compressed_oops().
1773   set_use_compressed_klass_ptrs();
1774 
1775   // Also checks that certain machines are slower with compressed oops
1776   // in vm_version initialization code.
1777 #endif // _LP64
1778 #endif // !ZERO
1779 }
1780 
1781 void Arguments::set_parallel_gc_flags() {
1782   assert(UseParallelGC || UseParallelOldGC, "Error");
1783   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1784   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1785     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1786   }
1787   FLAG_SET_DEFAULT(UseParallelGC, true);
1788 
1789   // If no heap maximum was requested explicitly, use some reasonable fraction
1790   // of the physical memory, up to a maximum of 1GB.
1791   FLAG_SET_DEFAULT(ParallelGCThreads,
1792                    Abstract_VM_Version::parallel_worker_threads());
1793   if (ParallelGCThreads == 0) {
1794     jio_fprintf(defaultStream::error_stream(),
1795         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1796     vm_exit(1);
1797   }
1798 
1799   if (UseAdaptiveSizePolicy) {
1800     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1801     // unless the user actually sets these flags.
1802     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1803       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1804       _min_heap_free_ratio = MinHeapFreeRatio;
1805     }
1806     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1807       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1808       _max_heap_free_ratio = MaxHeapFreeRatio;
1809     }
1810   }
1811 
1812   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1813   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1814   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1815   // See CR 6362902 for details.
1816   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1817     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1818        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1819     }
1820     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1821       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1822     }
1823   }
1824 
1825   if (UseParallelOldGC) {
1826     // Par compact uses lower default values since they are treated as
1827     // minimums.  These are different defaults because of the different
1828     // interpretation and are not ergonomically set.
1829     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1830       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1831     }
1832   }
1833 }
1834 
1835 void Arguments::set_g1_gc_flags() {
1836   assert(UseG1GC, "Error");
1837 #ifdef COMPILER1
1838   FastTLABRefill = false;
1839 #endif
1840   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1841   if (ParallelGCThreads == 0) {
1842     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1843     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1844   }
1845 
1846 #if INCLUDE_ALL_GCS
1847   if (G1ConcRefinementThreads == 0) {
1848     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1849   }
1850 #endif
1851 
1852   // MarkStackSize will be set (if it hasn't been set by the user)
1853   // when concurrent marking is initialized.
1854   // Its value will be based upon the number of parallel marking threads.
1855   // But we do set the maximum mark stack size here.
1856   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1857     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1858   }
1859 
1860   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1861     // In G1, we want the default GC overhead goal to be higher than
1862     // say in PS. So we set it here to 10%. Otherwise the heap might
1863     // be expanded more aggressively than we would like it to. In
1864     // fact, even 10% seems to not be high enough in some cases
1865     // (especially small GC stress tests that the main thing they do
1866     // is allocation). We might consider increase it further.
1867     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1868   }
1869 
1870   if (PrintGCDetails && Verbose) {
1871     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1872       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1873     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1874   }
1875 }
1876 
1877 #if !INCLUDE_ALL_GCS
1878 #ifdef ASSERT
1879 static bool verify_serial_gc_flags() {
1880   return (UseSerialGC &&
1881         !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1882           UseParallelGC || UseParallelOldGC));
1883 }
1884 #endif // ASSERT
1885 #endif // INCLUDE_ALL_GCS
1886 
1887 void Arguments::set_gc_specific_flags() {
1888 #if INCLUDE_ALL_GCS
1889   // Set per-collector flags
1890   if (UseParallelGC || UseParallelOldGC) {
1891     set_parallel_gc_flags();
1892   } else if (UseConcMarkSweepGC) {
1893     set_cms_and_parnew_gc_flags();
1894   } else if (UseG1GC) {
1895     set_g1_gc_flags();
1896   }
1897   if (AssumeMP && !UseSerialGC) {
1898     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1899       warning("If the number of processors is expected to increase from one, then"
1900               " you should configure the number of parallel GC threads appropriately"
1901               " using -XX:ParallelGCThreads=N");
1902     }
1903   }
1904   if (MinHeapFreeRatio == 100) {
1905     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1906     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1907   }
1908 #else // INCLUDE_ALL_GCS
1909   assert(verify_serial_gc_flags(), "SerialGC unset");
1910 #endif // INCLUDE_ALL_GCS
1911 }
1912 
1913 julong Arguments::limit_by_allocatable_memory(julong limit) {
1914   julong max_allocatable;
1915   julong result = limit;
1916   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1917     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1918   }
1919   return result;
1920 }
1921 
1922 // Use static initialization to get the default before parsing
1923 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1924 
1925 void Arguments::set_heap_size() {
1926   const julong phys_mem =
1927     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1928                             : (julong)MaxRAM;
1929 
1930   // If the maximum heap size has not been set with -Xmx,
1931   // then set it as fraction of the size of physical memory,
1932   // respecting the maximum and minimum sizes of the heap.
1933   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1934     julong reasonable_max = phys_mem / MaxRAMFraction;
1935 
1936     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1937       // Small physical memory, so use a minimum fraction of it for the heap
1938       reasonable_max = phys_mem / MinRAMFraction;
1939     } else {
1940       // Not-small physical memory, so require a heap at least
1941       // as large as MaxHeapSize
1942       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1943     }
1944     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1945       // Limit the heap size to ErgoHeapSizeLimit
1946       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1947     }
1948     if (UseCompressedOops) {
1949       // Limit the heap size to the maximum possible when using compressed oops
1950       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1951 
1952       // HeapBaseMinAddress can be greater than default but not less than.
1953       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1954         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1955           // matches compressed oops printing flags
1956           if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1957             jio_fprintf(defaultStream::error_stream(),
1958                         "HeapBaseMinAddress must be at least " UINTX_FORMAT
1959                         " (" UINTX_FORMAT "G) which is greater than value given "
1960                         UINTX_FORMAT "\n",
1961                         DefaultHeapBaseMinAddress,
1962                         DefaultHeapBaseMinAddress/G,
1963                         HeapBaseMinAddress);
1964           }
1965           FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1966         }
1967       }
1968 
1969       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1970         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1971         // but it should be not less than default MaxHeapSize.
1972         max_coop_heap -= HeapBaseMinAddress;
1973       }
1974       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1975     }
1976     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1977 
1978     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1979       // An initial heap size was specified on the command line,
1980       // so be sure that the maximum size is consistent.  Done
1981       // after call to limit_by_allocatable_memory because that
1982       // method might reduce the allocation size.
1983       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1984     }
1985 
1986     if (PrintGCDetails && Verbose) {
1987       // Cannot use gclog_or_tty yet.
1988       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1989     }
1990     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1991   }
1992 
1993   // If the minimum or initial heap_size have not been set or requested to be set
1994   // ergonomically, set them accordingly.
1995   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1996     julong reasonable_minimum = (julong)(OldSize + NewSize);
1997 
1998     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1999 
2000     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2001 
2002     if (InitialHeapSize == 0) {
2003       julong reasonable_initial = phys_mem / InitialRAMFraction;
2004 
2005       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2006       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2007 
2008       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2009 
2010       if (PrintGCDetails && Verbose) {
2011         // Cannot use gclog_or_tty yet.
2012         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
2013       }
2014       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
2015     }
2016     // If the minimum heap size has not been set (via -Xms),
2017     // synchronize with InitialHeapSize to avoid errors with the default value.
2018     if (min_heap_size() == 0) {
2019       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
2020       if (PrintGCDetails && Verbose) {
2021         // Cannot use gclog_or_tty yet.
2022         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
2023       }
2024     }
2025   }
2026 }
2027 
2028 // This must be called after ergonomics because we want bytecode rewriting
2029 // if the server compiler is used, or if UseSharedSpaces is disabled.
2030 void Arguments::set_bytecode_flags() {
2031   // Better not attempt to store into a read-only space.
2032   if (UseSharedSpaces) {
2033     FLAG_SET_DEFAULT(RewriteBytecodes, false);
2034     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2035   }
2036 
2037   if (!RewriteBytecodes) {
2038     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2039   }
2040 }
2041 
2042 // Aggressive optimization flags  -XX:+AggressiveOpts
2043 void Arguments::set_aggressive_opts_flags() {
2044 #ifdef COMPILER2
2045   if (AggressiveUnboxing) {
2046     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2047       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2048     } else if (!EliminateAutoBox) {
2049       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2050       AggressiveUnboxing = false;
2051     }
2052     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2053       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2054     } else if (!DoEscapeAnalysis) {
2055       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2056       AggressiveUnboxing = false;
2057     }
2058   }
2059   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2060     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2061       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2062     }
2063     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2064       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2065     }
2066 
2067     // Feed the cache size setting into the JDK
2068     char buffer[1024];
2069     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2070     add_property(buffer);
2071   }
2072   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2073     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2074   }
2075 #endif
2076 
2077   if (AggressiveOpts) {
2078 // Sample flag setting code
2079 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2080 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
2081 //    }
2082   }
2083 }
2084 
2085 //===========================================================================================================
2086 // Parsing of java.compiler property
2087 
2088 void Arguments::process_java_compiler_argument(char* arg) {
2089   // For backwards compatibility, Djava.compiler=NONE or ""
2090   // causes us to switch to -Xint mode UNLESS -Xdebug
2091   // is also specified.
2092   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2093     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2094   }
2095 }
2096 
2097 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2098   _sun_java_launcher = os::strdup_check_oom(launcher);
2099 }
2100 
2101 bool Arguments::created_by_java_launcher() {
2102   assert(_sun_java_launcher != NULL, "property must have value");
2103   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2104 }
2105 
2106 bool Arguments::sun_java_launcher_is_altjvm() {
2107   return _sun_java_launcher_is_altjvm;
2108 }
2109 
2110 //===========================================================================================================
2111 // Parsing of main arguments
2112 
2113 bool Arguments::verify_interval(uintx val, uintx min,
2114                                 uintx max, const char* name) {
2115   // Returns true iff value is in the inclusive interval [min..max]
2116   // false, otherwise.
2117   if (val >= min && val <= max) {
2118     return true;
2119   }
2120   jio_fprintf(defaultStream::error_stream(),
2121               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2122               " and " UINTX_FORMAT "\n",
2123               name, val, min, max);
2124   return false;
2125 }
2126 
2127 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2128   // Returns true if given value is at least specified min threshold
2129   // false, otherwise.
2130   if (val >= min ) {
2131       return true;
2132   }
2133   jio_fprintf(defaultStream::error_stream(),
2134               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2135               name, val, min);
2136   return false;
2137 }
2138 
2139 bool Arguments::verify_percentage(uintx value, const char* name) {
2140   if (is_percentage(value)) {
2141     return true;
2142   }
2143   jio_fprintf(defaultStream::error_stream(),
2144               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2145               name, value);
2146   return false;
2147 }
2148 
2149 // check if do gclog rotation
2150 // +UseGCLogFileRotation is a must,
2151 // no gc log rotation when log file not supplied or
2152 // NumberOfGCLogFiles is 0
2153 void check_gclog_consistency() {
2154   if (UseGCLogFileRotation) {
2155     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2156       jio_fprintf(defaultStream::output_stream(),
2157                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2158                   "where num_of_file > 0\n"
2159                   "GC log rotation is turned off\n");
2160       UseGCLogFileRotation = false;
2161     }
2162   }
2163 
2164   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2165     FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2166     jio_fprintf(defaultStream::output_stream(),
2167                 "GCLogFileSize changed to minimum 8K\n");
2168   }
2169 }
2170 
2171 // This function is called for -Xloggc:<filename>, it can be used
2172 // to check if a given file name(or string) conforms to the following
2173 // specification:
2174 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2175 // %p and %t only allowed once. We only limit usage of filename not path
2176 bool is_filename_valid(const char *file_name) {
2177   const char* p = file_name;
2178   char file_sep = os::file_separator()[0];
2179   const char* cp;
2180   // skip prefix path
2181   for (cp = file_name; *cp != '\0'; cp++) {
2182     if (*cp == '/' || *cp == file_sep) {
2183       p = cp + 1;
2184     }
2185   }
2186 
2187   int count_p = 0;
2188   int count_t = 0;
2189   while (*p != '\0') {
2190     if ((*p >= '0' && *p <= '9') ||
2191         (*p >= 'A' && *p <= 'Z') ||
2192         (*p >= 'a' && *p <= 'z') ||
2193          *p == '-'               ||
2194          *p == '_'               ||
2195          *p == '.') {
2196        p++;
2197        continue;
2198     }
2199     if (*p == '%') {
2200       if(*(p + 1) == 'p') {
2201         p += 2;
2202         count_p ++;
2203         continue;
2204       }
2205       if (*(p + 1) == 't') {
2206         p += 2;
2207         count_t ++;
2208         continue;
2209       }
2210     }
2211     return false;
2212   }
2213   return count_p < 2 && count_t < 2;
2214 }
2215 
2216 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2217   if (!is_percentage(min_heap_free_ratio)) {
2218     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2219     return false;
2220   }
2221   if (min_heap_free_ratio > MaxHeapFreeRatio) {
2222     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2223                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2224                   MaxHeapFreeRatio);
2225     return false;
2226   }
2227   // This does not set the flag itself, but stores the value in a safe place for later usage.
2228   _min_heap_free_ratio = min_heap_free_ratio;
2229   return true;
2230 }
2231 
2232 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2233   if (!is_percentage(max_heap_free_ratio)) {
2234     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2235     return false;
2236   }
2237   if (max_heap_free_ratio < MinHeapFreeRatio) {
2238     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2239                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2240                   MinHeapFreeRatio);
2241     return false;
2242   }
2243   // This does not set the flag itself, but stores the value in a safe place for later usage.
2244   _max_heap_free_ratio = max_heap_free_ratio;
2245   return true;
2246 }
2247 
2248 // Check consistency of GC selection
2249 bool Arguments::check_gc_consistency_user() {
2250   check_gclog_consistency();
2251   // Ensure that the user has not selected conflicting sets
2252   // of collectors.
2253   uint i = 0;
2254   if (UseSerialGC)                       i++;
2255   if (UseConcMarkSweepGC)                i++;
2256   if (UseParallelGC || UseParallelOldGC) i++;
2257   if (UseG1GC)                           i++;
2258   if (i > 1) {
2259     jio_fprintf(defaultStream::error_stream(),
2260                 "Conflicting collector combinations in option list; "
2261                 "please refer to the release notes for the combinations "
2262                 "allowed\n");
2263     return false;
2264   }
2265 
2266   if (UseConcMarkSweepGC && !UseParNewGC) {
2267     jio_fprintf(defaultStream::error_stream(),
2268         "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2269     return false;
2270   }
2271 
2272   if (UseParNewGC && !UseConcMarkSweepGC) {
2273     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2274     // set up UseSerialGC properly, so that can't be used in the check here.
2275     jio_fprintf(defaultStream::error_stream(),
2276         "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2277     return false;
2278   }
2279 
2280   return true;
2281 }
2282 
2283 // Check stack pages settings
2284 bool Arguments::check_stack_pages()
2285 {
2286   bool status = true;
2287   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2288   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2289   // greater stack shadow pages can't generate instruction to bang stack
2290   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2291   return status;
2292 }
2293 
2294 // Check the consistency of vm_init_args
2295 bool Arguments::check_vm_args_consistency() {
2296   // Method for adding checks for flag consistency.
2297   // The intent is to warn the user of all possible conflicts,
2298   // before returning an error.
2299   // Note: Needs platform-dependent factoring.
2300   bool status = true;
2301 
2302   if (TLABRefillWasteFraction == 0) {
2303     jio_fprintf(defaultStream::error_stream(),
2304                 "TLABRefillWasteFraction should be a denominator, "
2305                 "not " SIZE_FORMAT "\n",
2306                 TLABRefillWasteFraction);
2307     status = false;
2308   }
2309 
2310   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2311                               "AdaptiveSizePolicyWeight");
2312   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2313 
2314   // Divide by bucket size to prevent a large size from causing rollover when
2315   // calculating amount of memory needed to be allocated for the String table.
2316   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2317     (max_uintx / StringTable::bucket_size()), "StringTable size");
2318 
2319   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2320     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2321 
2322   {
2323     // Using "else if" below to avoid printing two error messages if min > max.
2324     // This will also prevent us from reporting both min>100 and max>100 at the
2325     // same time, but that is less annoying than printing two identical errors IMHO.
2326     FormatBuffer<80> err_msg("%s","");
2327     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2328       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2329       status = false;
2330     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2331       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2332       status = false;
2333     }
2334   }
2335 
2336   // Min/MaxMetaspaceFreeRatio
2337   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2338   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2339 
2340   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2341     jio_fprintf(defaultStream::error_stream(),
2342                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2343                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2344                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2345                 MinMetaspaceFreeRatio,
2346                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2347                 MaxMetaspaceFreeRatio);
2348     status = false;
2349   }
2350 
2351   // Trying to keep 100% free is not practical
2352   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2353 
2354   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2355     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2356   }
2357 
2358   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2359     // Settings to encourage splitting.
2360     if (!FLAG_IS_CMDLINE(NewRatio)) {
2361       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2362     }
2363     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2364       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2365     }
2366   }
2367 
2368   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2369     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2370   }
2371 
2372   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2373   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2374   if (GCTimeLimit == 100) {
2375     // Turn off gc-overhead-limit-exceeded checks
2376     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2377   }
2378 
2379   status = status && check_gc_consistency_user();
2380   status = status && check_stack_pages();
2381 
2382   status = status && verify_percentage(CMSIncrementalSafetyFactor,
2383                                     "CMSIncrementalSafetyFactor");
2384 
2385   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2386   // insists that we hold the requisite locks so that the iteration is
2387   // MT-safe. For the verification at start-up and shut-down, we don't
2388   // yet have a good way of acquiring and releasing these locks,
2389   // which are not visible at the CollectedHeap level. We want to
2390   // be able to acquire these locks and then do the iteration rather
2391   // than just disable the lock verification. This will be fixed under
2392   // bug 4788986.
2393   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2394     if (VerifyDuringStartup) {
2395       warning("Heap verification at start-up disabled "
2396               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2397       VerifyDuringStartup = false; // Disable verification at start-up
2398     }
2399 
2400     if (VerifyBeforeExit) {
2401       warning("Heap verification at shutdown disabled "
2402               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2403       VerifyBeforeExit = false; // Disable verification at shutdown
2404     }
2405   }
2406 
2407   // Note: only executed in non-PRODUCT mode
2408   if (!UseAsyncConcMarkSweepGC &&
2409       (ExplicitGCInvokesConcurrent ||
2410        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2411     jio_fprintf(defaultStream::error_stream(),
2412                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2413                 " with -UseAsyncConcMarkSweepGC");
2414     status = false;
2415   }
2416 
2417   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2418 
2419 #if INCLUDE_ALL_GCS
2420   if (UseG1GC) {
2421     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2422     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2423     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2424 
2425     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2426                                          "InitiatingHeapOccupancyPercent");
2427     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2428                                         "G1RefProcDrainInterval");
2429     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2430                                         "G1ConcMarkStepDurationMillis");
2431     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2432                                        "G1ConcRSHotCardLimit");
2433     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2434                                        "G1ConcRSLogCacheSize");
2435     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2436                                        "StringDeduplicationAgeThreshold");
2437   }
2438   if (UseConcMarkSweepGC) {
2439     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2440     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2441     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2442     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2443 
2444     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2445 
2446     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2447     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2448     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2449 
2450     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2451 
2452     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2453     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2454 
2455     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2456     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2457     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2458 
2459     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2460 
2461     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2462 
2463     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2464     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2465     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2466     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2467     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2468   }
2469 
2470   if (UseParallelGC || UseParallelOldGC) {
2471     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2472     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2473 
2474     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2475     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2476 
2477     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2478     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2479 
2480     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2481 
2482     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2483   }
2484 #endif // INCLUDE_ALL_GCS
2485 
2486   status = status && verify_interval(RefDiscoveryPolicy,
2487                                      ReferenceProcessor::DiscoveryPolicyMin,
2488                                      ReferenceProcessor::DiscoveryPolicyMax,
2489                                      "RefDiscoveryPolicy");
2490 
2491   // Limit the lower bound of this flag to 1 as it is used in a division
2492   // expression.
2493   status = status && verify_interval(TLABWasteTargetPercent,
2494                                      1, 100, "TLABWasteTargetPercent");
2495 
2496   status = status && verify_object_alignment();
2497 
2498   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2499                                       "CompressedClassSpaceSize");
2500 
2501   status = status && verify_interval(MarkStackSizeMax,
2502                                   1, (max_jint - 1), "MarkStackSizeMax");
2503   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2504 
2505   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2506 
2507   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2508 
2509   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2510 
2511   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2512   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2513 
2514   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2515 
2516   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2517   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2518   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2519 
2520   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2521   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2522 
2523   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2524   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2525   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2526 
2527   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2528   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2529 
2530   status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2531   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2532   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2533   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2534 
2535   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2536 #ifdef COMPILER1
2537   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2538 #endif
2539   status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2540 
2541   if (PrintNMTStatistics) {
2542 #if INCLUDE_NMT
2543     if (MemTracker::tracking_level() == NMT_off) {
2544 #endif // INCLUDE_NMT
2545       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2546       PrintNMTStatistics = false;
2547 #if INCLUDE_NMT
2548     }
2549 #endif
2550   }
2551 
2552   // Need to limit the extent of the padding to reasonable size.
2553   // 8K is well beyond the reasonable HW cache line size, even with the
2554   // aggressive prefetching, while still leaving the room for segregating
2555   // among the distinct pages.
2556   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2557     jio_fprintf(defaultStream::error_stream(),
2558                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2559                 ContendedPaddingWidth, 0, 8192);
2560     status = false;
2561   }
2562 
2563   // Need to enforce the padding not to break the existing field alignments.
2564   // It is sufficient to check against the largest type size.
2565   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2566     jio_fprintf(defaultStream::error_stream(),
2567                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2568                 ContendedPaddingWidth, BytesPerLong);
2569     status = false;
2570   }
2571 
2572   // Check lower bounds of the code cache
2573   // Template Interpreter code is approximately 3X larger in debug builds.
2574   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2575   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2576     jio_fprintf(defaultStream::error_stream(),
2577                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2578                 os::vm_page_size()/K);
2579     status = false;
2580   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2581     jio_fprintf(defaultStream::error_stream(),
2582                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2583                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2584     status = false;
2585   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2586     jio_fprintf(defaultStream::error_stream(),
2587                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2588                 min_code_cache_size/K);
2589     status = false;
2590   } else if (ReservedCodeCacheSize > 2*G) {
2591     // Code cache size larger than MAXINT is not supported.
2592     jio_fprintf(defaultStream::error_stream(),
2593                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2594                 (2*G)/M);
2595     status = false;
2596   } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2597     jio_fprintf(defaultStream::error_stream(),
2598                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2599                 min_code_cache_size/K);
2600     status = false;
2601   } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2602              && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2603     jio_fprintf(defaultStream::error_stream(),
2604                 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2605                 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2606                 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2607     status = false;
2608   }
2609 
2610   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2611   status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2612   status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2613   status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2614 
2615 
2616   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2617   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2618   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2619   // Check the minimum number of compiler threads
2620   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2621 
2622   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2623     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2624   }
2625 
2626   return status;
2627 }
2628 
2629 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2630   const char* option_type) {
2631   if (ignore) return false;
2632 
2633   const char* spacer = " ";
2634   if (option_type == NULL) {
2635     option_type = ++spacer; // Set both to the empty string.
2636   }
2637 
2638   if (os::obsolete_option(option)) {
2639     jio_fprintf(defaultStream::error_stream(),
2640                 "Obsolete %s%soption: %s\n", option_type, spacer,
2641       option->optionString);
2642     return false;
2643   } else {
2644     jio_fprintf(defaultStream::error_stream(),
2645                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2646       option->optionString);
2647     return true;
2648   }
2649 }
2650 
2651 static const char* user_assertion_options[] = {
2652   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2653 };
2654 
2655 static const char* system_assertion_options[] = {
2656   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2657 };
2658 
2659 bool Arguments::parse_uintx(const char* value,
2660                             uintx* uintx_arg,
2661                             uintx min_size) {
2662 
2663   // Check the sign first since atomull() parses only unsigned values.
2664   bool value_is_positive = !(*value == '-');
2665 
2666   if (value_is_positive) {
2667     julong n;
2668     bool good_return = atomull(value, &n);
2669     if (good_return) {
2670       bool above_minimum = n >= min_size;
2671       bool value_is_too_large = n > max_uintx;
2672 
2673       if (above_minimum && !value_is_too_large) {
2674         *uintx_arg = n;
2675         return true;
2676       }
2677     }
2678   }
2679   return false;
2680 }
2681 
2682 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2683                                                   julong* long_arg,
2684                                                   julong min_size) {
2685   if (!atomull(s, long_arg)) return arg_unreadable;
2686   return check_memory_size(*long_arg, min_size);
2687 }
2688 
2689 // Parse JavaVMInitArgs structure
2690 
2691 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2692   // For components of the system classpath.
2693   SysClassPath scp(Arguments::get_sysclasspath());
2694   bool scp_assembly_required = false;
2695 
2696   // Save default settings for some mode flags
2697   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2698   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2699   Arguments::_ClipInlining             = ClipInlining;
2700   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2701 
2702   // Setup flags for mixed which is the default
2703   set_mode_flags(_mixed);
2704 
2705   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2706   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2707   if (result != JNI_OK) {
2708     return result;
2709   }
2710 
2711   // Parse JavaVMInitArgs structure passed in
2712   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2713   if (result != JNI_OK) {
2714     return result;
2715   }
2716 
2717   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2718   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2719   if (result != JNI_OK) {
2720     return result;
2721   }
2722 
2723   // Do final processing now that all arguments have been parsed
2724   result = finalize_vm_init_args(&scp, scp_assembly_required);
2725   if (result != JNI_OK) {
2726     return result;
2727   }
2728 
2729   return JNI_OK;
2730 }
2731 
2732 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2733 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2734 // are dealing with -agentpath (case where name is a path), otherwise with
2735 // -agentlib
2736 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2737   char *_name;
2738   const char *_hprof = "hprof", *_jdwp = "jdwp";
2739   size_t _len_hprof, _len_jdwp, _len_prefix;
2740 
2741   if (is_path) {
2742     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2743       return false;
2744     }
2745 
2746     _name++;  // skip past last path separator
2747     _len_prefix = strlen(JNI_LIB_PREFIX);
2748 
2749     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2750       return false;
2751     }
2752 
2753     _name += _len_prefix;
2754     _len_hprof = strlen(_hprof);
2755     _len_jdwp = strlen(_jdwp);
2756 
2757     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2758       _name += _len_hprof;
2759     }
2760     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2761       _name += _len_jdwp;
2762     }
2763     else {
2764       return false;
2765     }
2766 
2767     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2768       return false;
2769     }
2770 
2771     return true;
2772   }
2773 
2774   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2775     return true;
2776   }
2777 
2778   return false;
2779 }
2780 
2781 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2782                                        SysClassPath* scp_p,
2783                                        bool* scp_assembly_required_p,
2784                                        Flag::Flags origin) {
2785   // Remaining part of option string
2786   const char* tail;
2787 
2788   // iterate over arguments
2789   for (int index = 0; index < args->nOptions; index++) {
2790     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2791 
2792     const JavaVMOption* option = args->options + index;
2793 
2794     if (!match_option(option, "-Djava.class.path", &tail) &&
2795         !match_option(option, "-Dsun.java.command", &tail) &&
2796         !match_option(option, "-Dsun.java.launcher", &tail)) {
2797 
2798         // add all jvm options to the jvm_args string. This string
2799         // is used later to set the java.vm.args PerfData string constant.
2800         // the -Djava.class.path and the -Dsun.java.command options are
2801         // omitted from jvm_args string as each have their own PerfData
2802         // string constant object.
2803         build_jvm_args(option->optionString);
2804     }
2805 
2806     // -verbose:[class/gc/jni]
2807     if (match_option(option, "-verbose", &tail)) {
2808       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2809         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2810         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2811       } else if (!strcmp(tail, ":gc")) {
2812         FLAG_SET_CMDLINE(bool, PrintGC, true);
2813       } else if (!strcmp(tail, ":jni")) {
2814         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2815       }
2816     // -da / -ea / -disableassertions / -enableassertions
2817     // These accept an optional class/package name separated by a colon, e.g.,
2818     // -da:java.lang.Thread.
2819     } else if (match_option(option, user_assertion_options, &tail, true)) {
2820       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2821       if (*tail == '\0') {
2822         JavaAssertions::setUserClassDefault(enable);
2823       } else {
2824         assert(*tail == ':', "bogus match by match_option()");
2825         JavaAssertions::addOption(tail + 1, enable);
2826       }
2827     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2828     } else if (match_option(option, system_assertion_options, &tail, false)) {
2829       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2830       JavaAssertions::setSystemClassDefault(enable);
2831     // -bootclasspath:
2832     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2833       scp_p->reset_path(tail);
2834       *scp_assembly_required_p = true;
2835     // -bootclasspath/a:
2836     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2837       scp_p->add_suffix(tail);
2838       *scp_assembly_required_p = true;
2839     // -bootclasspath/p:
2840     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2841       scp_p->add_prefix(tail);
2842       *scp_assembly_required_p = true;
2843     // -Xrun
2844     } else if (match_option(option, "-Xrun", &tail)) {
2845       if (tail != NULL) {
2846         const char* pos = strchr(tail, ':');
2847         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2848         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2849         name[len] = '\0';
2850 
2851         char *options = NULL;
2852         if(pos != NULL) {
2853           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2854           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2855         }
2856 #if !INCLUDE_JVMTI
2857         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2858           jio_fprintf(defaultStream::error_stream(),
2859             "Profiling and debugging agents are not supported in this VM\n");
2860           return JNI_ERR;
2861         }
2862 #endif // !INCLUDE_JVMTI
2863         add_init_library(name, options);
2864       }
2865     // -agentlib and -agentpath
2866     } else if (match_option(option, "-agentlib:", &tail) ||
2867           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2868       if(tail != NULL) {
2869         const char* pos = strchr(tail, '=');
2870         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2871         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2872         name[len] = '\0';
2873 
2874         char *options = NULL;
2875         if(pos != NULL) {
2876           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2877         }
2878 #if !INCLUDE_JVMTI
2879         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2880           jio_fprintf(defaultStream::error_stream(),
2881             "Profiling and debugging agents are not supported in this VM\n");
2882           return JNI_ERR;
2883         }
2884 #endif // !INCLUDE_JVMTI
2885         add_init_agent(name, options, is_absolute_path);
2886       }
2887     // -javaagent
2888     } else if (match_option(option, "-javaagent:", &tail)) {
2889 #if !INCLUDE_JVMTI
2890       jio_fprintf(defaultStream::error_stream(),
2891         "Instrumentation agents are not supported in this VM\n");
2892       return JNI_ERR;
2893 #else
2894       if(tail != NULL) {
2895         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2896         add_init_agent("instrument", options, false);
2897       }
2898 #endif // !INCLUDE_JVMTI
2899     // -Xnoclassgc
2900     } else if (match_option(option, "-Xnoclassgc")) {
2901       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2902     // -Xconcgc
2903     } else if (match_option(option, "-Xconcgc")) {
2904       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2905     // -Xnoconcgc
2906     } else if (match_option(option, "-Xnoconcgc")) {
2907       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2908     // -Xbatch
2909     } else if (match_option(option, "-Xbatch")) {
2910       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2911     // -Xmn for compatibility with other JVM vendors
2912     } else if (match_option(option, "-Xmn", &tail)) {
2913       julong long_initial_young_size = 0;
2914       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2915       if (errcode != arg_in_range) {
2916         jio_fprintf(defaultStream::error_stream(),
2917                     "Invalid initial young generation size: %s\n", option->optionString);
2918         describe_range_error(errcode);
2919         return JNI_EINVAL;
2920       }
2921       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2922       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2923     // -Xms
2924     } else if (match_option(option, "-Xms", &tail)) {
2925       julong long_initial_heap_size = 0;
2926       // an initial heap size of 0 means automatically determine
2927       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2928       if (errcode != arg_in_range) {
2929         jio_fprintf(defaultStream::error_stream(),
2930                     "Invalid initial heap size: %s\n", option->optionString);
2931         describe_range_error(errcode);
2932         return JNI_EINVAL;
2933       }
2934       set_min_heap_size((uintx)long_initial_heap_size);
2935       // Currently the minimum size and the initial heap sizes are the same.
2936       // Can be overridden with -XX:InitialHeapSize.
2937       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2938     // -Xmx
2939     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2940       julong long_max_heap_size = 0;
2941       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2942       if (errcode != arg_in_range) {
2943         jio_fprintf(defaultStream::error_stream(),
2944                     "Invalid maximum heap size: %s\n", option->optionString);
2945         describe_range_error(errcode);
2946         return JNI_EINVAL;
2947       }
2948       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2949     // Xmaxf
2950     } else if (match_option(option, "-Xmaxf", &tail)) {
2951       char* err;
2952       int maxf = (int)(strtod(tail, &err) * 100);
2953       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2954         jio_fprintf(defaultStream::error_stream(),
2955                     "Bad max heap free percentage size: %s\n",
2956                     option->optionString);
2957         return JNI_EINVAL;
2958       } else {
2959         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2960       }
2961     // Xminf
2962     } else if (match_option(option, "-Xminf", &tail)) {
2963       char* err;
2964       int minf = (int)(strtod(tail, &err) * 100);
2965       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2966         jio_fprintf(defaultStream::error_stream(),
2967                     "Bad min heap free percentage size: %s\n",
2968                     option->optionString);
2969         return JNI_EINVAL;
2970       } else {
2971         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2972       }
2973     // -Xss
2974     } else if (match_option(option, "-Xss", &tail)) {
2975       julong long_ThreadStackSize = 0;
2976       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2977       if (errcode != arg_in_range) {
2978         jio_fprintf(defaultStream::error_stream(),
2979                     "Invalid thread stack size: %s\n", option->optionString);
2980         describe_range_error(errcode);
2981         return JNI_EINVAL;
2982       }
2983       // Internally track ThreadStackSize in units of 1024 bytes.
2984       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2985                               round_to((int)long_ThreadStackSize, K) / K);
2986     // -Xoss
2987     } else if (match_option(option, "-Xoss", &tail)) {
2988           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2989     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2990       julong long_CodeCacheExpansionSize = 0;
2991       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2992       if (errcode != arg_in_range) {
2993         jio_fprintf(defaultStream::error_stream(),
2994                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2995                    os::vm_page_size()/K);
2996         return JNI_EINVAL;
2997       }
2998       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2999     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3000                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3001       julong long_ReservedCodeCacheSize = 0;
3002 
3003       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3004       if (errcode != arg_in_range) {
3005         jio_fprintf(defaultStream::error_stream(),
3006                     "Invalid maximum code cache size: %s.\n", option->optionString);
3007         return JNI_EINVAL;
3008       }
3009       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3010       // -XX:NonNMethodCodeHeapSize=
3011     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
3012       julong long_NonNMethodCodeHeapSize = 0;
3013 
3014       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
3015       if (errcode != arg_in_range) {
3016         jio_fprintf(defaultStream::error_stream(),
3017                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
3018         return JNI_EINVAL;
3019       }
3020       FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
3021       // -XX:ProfiledCodeHeapSize=
3022     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
3023       julong long_ProfiledCodeHeapSize = 0;
3024 
3025       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
3026       if (errcode != arg_in_range) {
3027         jio_fprintf(defaultStream::error_stream(),
3028                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
3029         return JNI_EINVAL;
3030       }
3031       FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
3032       // -XX:NonProfiledCodeHeapSizee=
3033     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
3034       julong long_NonProfiledCodeHeapSize = 0;
3035 
3036       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
3037       if (errcode != arg_in_range) {
3038         jio_fprintf(defaultStream::error_stream(),
3039                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
3040         return JNI_EINVAL;
3041       }
3042       FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
3043       //-XX:IncreaseFirstTierCompileThresholdAt=
3044     } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3045         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3046         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3047           jio_fprintf(defaultStream::error_stream(),
3048                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3049                       option->optionString);
3050           return JNI_EINVAL;
3051         }
3052         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3053     // -green
3054     } else if (match_option(option, "-green")) {
3055       jio_fprintf(defaultStream::error_stream(),
3056                   "Green threads support not available\n");
3057           return JNI_EINVAL;
3058     // -native
3059     } else if (match_option(option, "-native")) {
3060           // HotSpot always uses native threads, ignore silently for compatibility
3061     // -Xsqnopause
3062     } else if (match_option(option, "-Xsqnopause")) {
3063           // EVM option, ignore silently for compatibility
3064     // -Xrs
3065     } else if (match_option(option, "-Xrs")) {
3066           // Classic/EVM option, new functionality
3067       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3068     } else if (match_option(option, "-Xusealtsigs")) {
3069           // change default internal VM signals used - lower case for back compat
3070       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3071     // -Xoptimize
3072     } else if (match_option(option, "-Xoptimize")) {
3073           // EVM option, ignore silently for compatibility
3074     // -Xprof
3075     } else if (match_option(option, "-Xprof")) {
3076 #if INCLUDE_FPROF
3077       _has_profile = true;
3078 #else // INCLUDE_FPROF
3079       jio_fprintf(defaultStream::error_stream(),
3080         "Flat profiling is not supported in this VM.\n");
3081       return JNI_ERR;
3082 #endif // INCLUDE_FPROF
3083     // -Xconcurrentio
3084     } else if (match_option(option, "-Xconcurrentio")) {
3085       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3086       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3087       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3088       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3089       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
3090 
3091       // -Xinternalversion
3092     } else if (match_option(option, "-Xinternalversion")) {
3093       jio_fprintf(defaultStream::output_stream(), "%s\n",
3094                   VM_Version::internal_vm_info_string());
3095       vm_exit(0);
3096 #ifndef PRODUCT
3097     // -Xprintflags
3098     } else if (match_option(option, "-Xprintflags")) {
3099       CommandLineFlags::printFlags(tty, false);
3100       vm_exit(0);
3101 #endif
3102     // -D
3103     } else if (match_option(option, "-D", &tail)) {
3104       const char* value;
3105       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3106             *value!= '\0' && strcmp(value, "\"\"") != 0) {
3107         // abort if -Djava.endorsed.dirs is set
3108         jio_fprintf(defaultStream::output_stream(),
3109           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3110           "in modular form will be supported via the concept of upgradeable modules.\n", value);
3111         return JNI_EINVAL;
3112       }
3113       if (match_option(option, "-Djava.ext.dirs=", &value) &&
3114             *value != '\0' && strcmp(value, "\"\"") != 0) {
3115         // abort if -Djava.ext.dirs is set
3116         jio_fprintf(defaultStream::output_stream(),
3117           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
3118         return JNI_EINVAL;
3119       }
3120 
3121       if (!add_property(tail)) {
3122         return JNI_ENOMEM;
3123       }
3124       // Out of the box management support
3125       if (match_option(option, "-Dcom.sun.management", &tail)) {
3126 #if INCLUDE_MANAGEMENT
3127         FLAG_SET_CMDLINE(bool, ManagementServer, true);
3128 #else
3129         jio_fprintf(defaultStream::output_stream(),
3130           "-Dcom.sun.management is not supported in this VM.\n");
3131         return JNI_ERR;
3132 #endif
3133       }
3134     // -Xint
3135     } else if (match_option(option, "-Xint")) {
3136           set_mode_flags(_int);
3137     // -Xmixed
3138     } else if (match_option(option, "-Xmixed")) {
3139           set_mode_flags(_mixed);
3140     // -Xcomp
3141     } else if (match_option(option, "-Xcomp")) {
3142       // for testing the compiler; turn off all flags that inhibit compilation
3143           set_mode_flags(_comp);
3144     // -Xshare:dump
3145     } else if (match_option(option, "-Xshare:dump")) {
3146       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3147       set_mode_flags(_int);     // Prevent compilation, which creates objects
3148     // -Xshare:on
3149     } else if (match_option(option, "-Xshare:on")) {
3150       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3151       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3152     // -Xshare:auto
3153     } else if (match_option(option, "-Xshare:auto")) {
3154       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3155       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3156     // -Xshare:off
3157     } else if (match_option(option, "-Xshare:off")) {
3158       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3159       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3160     // -Xverify
3161     } else if (match_option(option, "-Xverify", &tail)) {
3162       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3163         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3164         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3165       } else if (strcmp(tail, ":remote") == 0) {
3166         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3167         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3168       } else if (strcmp(tail, ":none") == 0) {
3169         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3170         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3171       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3172         return JNI_EINVAL;
3173       }
3174     // -Xdebug
3175     } else if (match_option(option, "-Xdebug")) {
3176       // note this flag has been used, then ignore
3177       set_xdebug_mode(true);
3178     // -Xnoagent
3179     } else if (match_option(option, "-Xnoagent")) {
3180       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3181     } else if (match_option(option, "-Xboundthreads")) {
3182       // Bind user level threads to kernel threads (Solaris only)
3183       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3184     } else if (match_option(option, "-Xloggc:", &tail)) {
3185       // Redirect GC output to the file. -Xloggc:<filename>
3186       // ostream_init_log(), when called will use this filename
3187       // to initialize a fileStream.
3188       _gc_log_filename = os::strdup_check_oom(tail);
3189      if (!is_filename_valid(_gc_log_filename)) {
3190        jio_fprintf(defaultStream::output_stream(),
3191                   "Invalid file name for use with -Xloggc: Filename can only contain the "
3192                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3193                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
3194         return JNI_EINVAL;
3195       }
3196       FLAG_SET_CMDLINE(bool, PrintGC, true);
3197       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3198 
3199     // JNI hooks
3200     } else if (match_option(option, "-Xcheck", &tail)) {
3201       if (!strcmp(tail, ":jni")) {
3202 #if !INCLUDE_JNI_CHECK
3203         warning("JNI CHECKING is not supported in this VM");
3204 #else
3205         CheckJNICalls = true;
3206 #endif // INCLUDE_JNI_CHECK
3207       } else if (is_bad_option(option, args->ignoreUnrecognized,
3208                                      "check")) {
3209         return JNI_EINVAL;
3210       }
3211     } else if (match_option(option, "vfprintf")) {
3212       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3213     } else if (match_option(option, "exit")) {
3214       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3215     } else if (match_option(option, "abort")) {
3216       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3217     // -XX:+AggressiveHeap
3218     } else if (match_option(option, "-XX:+AggressiveHeap")) {
3219 
3220       // This option inspects the machine and attempts to set various
3221       // parameters to be optimal for long-running, memory allocation
3222       // intensive jobs.  It is intended for machines with large
3223       // amounts of cpu and memory.
3224 
3225       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3226       // VM, but we may not be able to represent the total physical memory
3227       // available (like having 8gb of memory on a box but using a 32bit VM).
3228       // Thus, we need to make sure we're using a julong for intermediate
3229       // calculations.
3230       julong initHeapSize;
3231       julong total_memory = os::physical_memory();
3232 
3233       if (total_memory < (julong)256*M) {
3234         jio_fprintf(defaultStream::error_stream(),
3235                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3236         vm_exit(1);
3237       }
3238 
3239       // The heap size is half of available memory, or (at most)
3240       // all of possible memory less 160mb (leaving room for the OS
3241       // when using ISM).  This is the maximum; because adaptive sizing
3242       // is turned on below, the actual space used may be smaller.
3243 
3244       initHeapSize = MIN2(total_memory / (julong)2,
3245                           total_memory - (julong)160*M);
3246 
3247       initHeapSize = limit_by_allocatable_memory(initHeapSize);
3248 
3249       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3250          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3251          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3252          // Currently the minimum size and the initial heap sizes are the same.
3253          set_min_heap_size(initHeapSize);
3254       }
3255       if (FLAG_IS_DEFAULT(NewSize)) {
3256          // Make the young generation 3/8ths of the total heap.
3257          FLAG_SET_CMDLINE(uintx, NewSize,
3258                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3259          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3260       }
3261 
3262 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3263       FLAG_SET_DEFAULT(UseLargePages, true);
3264 #endif
3265 
3266       // Increase some data structure sizes for efficiency
3267       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3268       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3269       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3270 
3271       // See the OldPLABSize comment below, but replace 'after promotion'
3272       // with 'after copying'.  YoungPLABSize is the size of the survivor
3273       // space per-gc-thread buffers.  The default is 4kw.
3274       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
3275 
3276       // OldPLABSize is the size of the buffers in the old gen that
3277       // UseParallelGC uses to promote live data that doesn't fit in the
3278       // survivor spaces.  At any given time, there's one for each gc thread.
3279       // The default size is 1kw. These buffers are rarely used, since the
3280       // survivor spaces are usually big enough.  For specjbb, however, there
3281       // are occasions when there's lots of live data in the young gen
3282       // and we end up promoting some of it.  We don't have a definite
3283       // explanation for why bumping OldPLABSize helps, but the theory
3284       // is that a bigger PLAB results in retaining something like the
3285       // original allocation order after promotion, which improves mutator
3286       // locality.  A minor effect may be that larger PLABs reduce the
3287       // number of PLAB allocation events during gc.  The value of 8kw
3288       // was arrived at by experimenting with specjbb.
3289       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
3290 
3291       // Enable parallel GC and adaptive generation sizing
3292       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3293       FLAG_SET_DEFAULT(ParallelGCThreads,
3294                        Abstract_VM_Version::parallel_worker_threads());
3295 
3296       // Encourage steady state memory management
3297       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3298 
3299       // This appears to improve mutator locality
3300       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3301 
3302       // Get around early Solaris scheduling bug
3303       // (affinity vs other jobs on system)
3304       // but disallow DR and offlining (5008695).
3305       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3306 
3307     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3308     // and the last option wins.
3309     } else if (match_option(option, "-XX:+NeverTenure")) {
3310       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3311       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3312       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3313     } else if (match_option(option, "-XX:+AlwaysTenure")) {
3314       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3315       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3316       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3317     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3318       uintx max_tenuring_thresh = 0;
3319       if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3320         jio_fprintf(defaultStream::error_stream(),
3321                     "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3322       }
3323       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3324 
3325       if (MaxTenuringThreshold == 0) {
3326         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3327         FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3328       } else {
3329         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3330         FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3331       }
3332     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3333       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3334       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3335     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3336       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3337       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3338     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3339 #if defined(DTRACE_ENABLED)
3340       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3341       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3342       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3343       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3344 #else // defined(DTRACE_ENABLED)
3345       jio_fprintf(defaultStream::error_stream(),
3346                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3347       return JNI_EINVAL;
3348 #endif // defined(DTRACE_ENABLED)
3349 #ifdef ASSERT
3350     } else if (match_option(option, "-XX:+FullGCALot")) {
3351       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3352       // disable scavenge before parallel mark-compact
3353       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3354 #endif
3355     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3356       julong max_direct_memory_size = 0;
3357       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3358       if (errcode != arg_in_range) {
3359         jio_fprintf(defaultStream::error_stream(),
3360                     "Invalid maximum direct memory size: %s\n",
3361                     option->optionString);
3362         describe_range_error(errcode);
3363         return JNI_EINVAL;
3364       }
3365       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3366 #if !INCLUDE_MANAGEMENT
3367     } else if (match_option(option, "-XX:+ManagementServer")) {
3368         jio_fprintf(defaultStream::error_stream(),
3369           "ManagementServer is not supported in this VM.\n");
3370         return JNI_ERR;
3371 #endif // INCLUDE_MANAGEMENT
3372     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3373       // Skip -XX:Flags= since that case has already been handled
3374       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3375         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3376           return JNI_EINVAL;
3377         }
3378       }
3379     // Unknown option
3380     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3381       return JNI_ERR;
3382     }
3383   }
3384 
3385   // PrintSharedArchiveAndExit will turn on
3386   //   -Xshare:on
3387   //   -XX:+TraceClassPaths
3388   if (PrintSharedArchiveAndExit) {
3389     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3390     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3391     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3392   }
3393 
3394   // Change the default value for flags  which have different default values
3395   // when working with older JDKs.
3396 #ifdef LINUX
3397  if (JDK_Version::current().compare_major(6) <= 0 &&
3398       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3399     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3400   }
3401 #endif // LINUX
3402   fix_appclasspath();
3403   return JNI_OK;
3404 }
3405 
3406 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3407 //
3408 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3409 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3410 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3411 // path is treated as the current directory.
3412 //
3413 // This causes problems with CDS, which requires that all directories specified in the classpath
3414 // must be empty. In most cases, applications do NOT want to load classes from the current
3415 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3416 // scripts compatible with CDS.
3417 void Arguments::fix_appclasspath() {
3418   if (IgnoreEmptyClassPaths) {
3419     const char separator = *os::path_separator();
3420     const char* src = _java_class_path->value();
3421 
3422     // skip over all the leading empty paths
3423     while (*src == separator) {
3424       src ++;
3425     }
3426 
3427     char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3428     strncpy(copy, src, strlen(src) + 1);
3429 
3430     // trim all trailing empty paths
3431     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3432       *tail = '\0';
3433     }
3434 
3435     char from[3] = {separator, separator, '\0'};
3436     char to  [2] = {separator, '\0'};
3437     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3438       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3439       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3440     }
3441 
3442     _java_class_path->set_value(copy);
3443     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3444   }
3445 
3446   if (!PrintSharedArchiveAndExit) {
3447     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3448   }
3449 }
3450 
3451 static bool has_jar_files(const char* directory) {
3452   DIR* dir = os::opendir(directory);
3453   if (dir == NULL) return false;
3454 
3455   struct dirent *entry;
3456   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3457   bool hasJarFile = false;
3458   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3459     const char* name = entry->d_name;
3460     const char* ext = name + strlen(name) - 4;
3461     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3462   }
3463   FREE_C_HEAP_ARRAY(char, dbuf);
3464   os::closedir(dir);
3465   return hasJarFile ;
3466 }
3467 
3468 static int check_non_empty_dirs(const char* path) {
3469   const char separator = *os::path_separator();
3470   const char* const end = path + strlen(path);
3471   int nonEmptyDirs = 0;
3472   while (path < end) {
3473     const char* tmp_end = strchr(path, separator);
3474     if (tmp_end == NULL) {
3475       if (has_jar_files(path)) {
3476         nonEmptyDirs++;
3477         jio_fprintf(defaultStream::output_stream(),
3478           "Non-empty directory: %s\n", path);
3479       }
3480       path = end;
3481     } else {
3482       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3483       memcpy(dirpath, path, tmp_end - path);
3484       dirpath[tmp_end - path] = '\0';
3485       if (has_jar_files(dirpath)) {
3486         nonEmptyDirs++;
3487         jio_fprintf(defaultStream::output_stream(),
3488           "Non-empty directory: %s\n", dirpath);
3489       }
3490       FREE_C_HEAP_ARRAY(char, dirpath);
3491       path = tmp_end + 1;
3492     }
3493   }
3494   return nonEmptyDirs;
3495 }
3496 
3497 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3498   // check if the default lib/endorsed directory exists; if so, error
3499   char path[JVM_MAXPATHLEN];
3500   const char* fileSep = os::file_separator();
3501   sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3502 
3503   if (CheckEndorsedAndExtDirs) {
3504     int nonEmptyDirs = 0;
3505     // check endorsed directory
3506     nonEmptyDirs += check_non_empty_dirs(path);
3507     // check the extension directories
3508     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3509     if (nonEmptyDirs > 0) {
3510       return JNI_ERR;
3511     }
3512   }
3513 
3514   DIR* dir = os::opendir(path);
3515   if (dir != NULL) {
3516     jio_fprintf(defaultStream::output_stream(),
3517       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3518       "in modular form will be supported via the concept of upgradeable modules.\n");
3519     os::closedir(dir);
3520     return JNI_ERR;
3521   }
3522 
3523   sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3524   dir = os::opendir(path);
3525   if (dir != NULL) {
3526     jio_fprintf(defaultStream::output_stream(),
3527       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3528       "Use -classpath instead.\n.");
3529     os::closedir(dir);
3530     return JNI_ERR;
3531   }
3532 
3533   if (scp_assembly_required) {
3534     // Assemble the bootclasspath elements into the final path.
3535     Arguments::set_sysclasspath(scp_p->combined_path());
3536   }
3537 
3538   // This must be done after all arguments have been processed.
3539   // java_compiler() true means set to "NONE" or empty.
3540   if (java_compiler() && !xdebug_mode()) {
3541     // For backwards compatibility, we switch to interpreted mode if
3542     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3543     // not specified.
3544     set_mode_flags(_int);
3545   }
3546 
3547   if ((TieredCompilation && CompileThresholdScaling == 0)
3548       || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3549     set_mode_flags(_int);
3550   }
3551 
3552   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3553   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3554     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3555   }
3556 
3557 #ifndef COMPILER2
3558   // Don't degrade server performance for footprint
3559   if (FLAG_IS_DEFAULT(UseLargePages) &&
3560       MaxHeapSize < LargePageHeapSizeThreshold) {
3561     // No need for large granularity pages w/small heaps.
3562     // Note that large pages are enabled/disabled for both the
3563     // Java heap and the code cache.
3564     FLAG_SET_DEFAULT(UseLargePages, false);
3565   }
3566 
3567 #else
3568   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3569     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3570   }
3571 #endif
3572 
3573 #ifndef TIERED
3574   // Tiered compilation is undefined.
3575   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3576 #endif
3577 
3578   // If we are running in a headless jre, force java.awt.headless property
3579   // to be true unless the property has already been set.
3580   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3581   if (os::is_headless_jre()) {
3582     const char* headless = Arguments::get_property("java.awt.headless");
3583     if (headless == NULL) {
3584       char envbuffer[128];
3585       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3586         if (!add_property("java.awt.headless=true")) {
3587           return JNI_ENOMEM;
3588         }
3589       } else {
3590         char buffer[256];
3591         strcpy(buffer, "java.awt.headless=");
3592         strcat(buffer, envbuffer);
3593         if (!add_property(buffer)) {
3594           return JNI_ENOMEM;
3595         }
3596       }
3597     }
3598   }
3599 
3600   if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3601     // CMS can only be used with ParNew
3602     FLAG_SET_ERGO(bool, UseParNewGC, true);
3603   }
3604 
3605   if (!check_vm_args_consistency()) {
3606     return JNI_ERR;
3607   }
3608 
3609   return JNI_OK;
3610 }
3611 
3612 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3613   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3614                                             scp_assembly_required_p);
3615 }
3616 
3617 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3618   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3619                                             scp_assembly_required_p);
3620 }
3621 
3622 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3623   const int N_MAX_OPTIONS = 64;
3624   const int OPTION_BUFFER_SIZE = 1024;
3625   char buffer[OPTION_BUFFER_SIZE];
3626 
3627   // The variable will be ignored if it exceeds the length of the buffer.
3628   // Don't check this variable if user has special privileges
3629   // (e.g. unix su command).
3630   if (os::getenv(name, buffer, sizeof(buffer)) &&
3631       !os::have_special_privileges()) {
3632     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3633     jio_fprintf(defaultStream::error_stream(),
3634                 "Picked up %s: %s\n", name, buffer);
3635     char* rd = buffer;                        // pointer to the input string (rd)
3636     int i;
3637     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3638       while (isspace(*rd)) rd++;              // skip whitespace
3639       if (*rd == 0) break;                    // we re done when the input string is read completely
3640 
3641       // The output, option string, overwrites the input string.
3642       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3643       // input string (rd).
3644       char* wrt = rd;
3645 
3646       options[i++].optionString = wrt;        // Fill in option
3647       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3648         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3649           int quote = *rd;                    // matching quote to look for
3650           rd++;                               // don't copy open quote
3651           while (*rd != quote) {              // include everything (even spaces) up until quote
3652             if (*rd == 0) {                   // string termination means unmatched string
3653               jio_fprintf(defaultStream::error_stream(),
3654                           "Unmatched quote in %s\n", name);
3655               return JNI_ERR;
3656             }
3657             *wrt++ = *rd++;                   // copy to option string
3658           }
3659           rd++;                               // don't copy close quote
3660         } else {
3661           *wrt++ = *rd++;                     // copy to option string
3662         }
3663       }
3664       // Need to check if we're done before writing a NULL,
3665       // because the write could be to the byte that rd is pointing to.
3666       if (*rd++ == 0) {
3667         *wrt = 0;
3668         break;
3669       }
3670       *wrt = 0;                               // Zero terminate option
3671     }
3672     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3673     JavaVMInitArgs vm_args;
3674     vm_args.version = JNI_VERSION_1_2;
3675     vm_args.options = options;
3676     vm_args.nOptions = i;
3677     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3678 
3679     if (PrintVMOptions) {
3680       const char* tail;
3681       for (int i = 0; i < vm_args.nOptions; i++) {
3682         const JavaVMOption *option = vm_args.options + i;
3683         if (match_option(option, "-XX:", &tail)) {
3684           logOption(tail);
3685         }
3686       }
3687     }
3688 
3689     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3690   }
3691   return JNI_OK;
3692 }
3693 
3694 void Arguments::set_shared_spaces_flags() {
3695   if (DumpSharedSpaces) {
3696     if (RequireSharedSpaces) {
3697       warning("cannot dump shared archive while using shared archive");
3698     }
3699     UseSharedSpaces = false;
3700 #ifdef _LP64
3701     if (!UseCompressedOops || !UseCompressedClassPointers) {
3702       vm_exit_during_initialization(
3703         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3704     }
3705   } else {
3706     if (!UseCompressedOops || !UseCompressedClassPointers) {
3707       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3708     }
3709 #endif
3710   }
3711 }
3712 
3713 #if !INCLUDE_ALL_GCS
3714 static void force_serial_gc() {
3715   FLAG_SET_DEFAULT(UseSerialGC, true);
3716   UNSUPPORTED_GC_OPTION(UseG1GC);
3717   UNSUPPORTED_GC_OPTION(UseParallelGC);
3718   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3719   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3720   UNSUPPORTED_GC_OPTION(UseParNewGC);
3721 }
3722 #endif // INCLUDE_ALL_GCS
3723 
3724 // Sharing support
3725 // Construct the path to the archive
3726 static char* get_shared_archive_path() {
3727   char *shared_archive_path;
3728   if (SharedArchiveFile == NULL) {
3729     char jvm_path[JVM_MAXPATHLEN];
3730     os::jvm_path(jvm_path, sizeof(jvm_path));
3731     char *end = strrchr(jvm_path, *os::file_separator());
3732     if (end != NULL) *end = '\0';
3733     size_t jvm_path_len = strlen(jvm_path);
3734     size_t file_sep_len = strlen(os::file_separator());
3735     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3736         file_sep_len + 20, mtInternal);
3737     if (shared_archive_path != NULL) {
3738       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3739       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3740       strncat(shared_archive_path, "classes.jsa", 11);
3741     }
3742   } else {
3743     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3744     if (shared_archive_path != NULL) {
3745       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3746     }
3747   }
3748   return shared_archive_path;
3749 }
3750 
3751 #ifndef PRODUCT
3752 // Determine whether LogVMOutput should be implicitly turned on.
3753 static bool use_vm_log() {
3754   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3755       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3756       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3757       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3758       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3759     return true;
3760   }
3761 
3762 #ifdef COMPILER1
3763   if (PrintC1Statistics) {
3764     return true;
3765   }
3766 #endif // COMPILER1
3767 
3768 #ifdef COMPILER2
3769   if (PrintOptoAssembly || PrintOptoStatistics) {
3770     return true;
3771   }
3772 #endif // COMPILER2
3773 
3774   return false;
3775 }
3776 #endif // PRODUCT
3777 
3778 // Parse entry point called from JNI_CreateJavaVM
3779 
3780 jint Arguments::parse(const JavaVMInitArgs* args) {
3781 
3782   // Remaining part of option string
3783   const char* tail;
3784 
3785   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3786   const char* hotspotrc = ".hotspotrc";
3787   bool settings_file_specified = false;
3788   bool needs_hotspotrc_warning = false;
3789 
3790   const char* flags_file;
3791   int index;
3792   for (index = 0; index < args->nOptions; index++) {
3793     const JavaVMOption *option = args->options + index;
3794     if (ArgumentsExt::process_options(option)) {
3795       continue;
3796     }
3797     if (match_option(option, "-XX:Flags=", &tail)) {
3798       flags_file = tail;
3799       settings_file_specified = true;
3800       continue;
3801     }
3802     if (match_option(option, "-XX:+PrintVMOptions")) {
3803       PrintVMOptions = true;
3804       continue;
3805     }
3806     if (match_option(option, "-XX:-PrintVMOptions")) {
3807       PrintVMOptions = false;
3808       continue;
3809     }
3810     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3811       IgnoreUnrecognizedVMOptions = true;
3812       continue;
3813     }
3814     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3815       IgnoreUnrecognizedVMOptions = false;
3816       continue;
3817     }
3818     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3819       CommandLineFlags::printFlags(tty, false);
3820       vm_exit(0);
3821     }
3822 #if INCLUDE_NMT
3823     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3824       // The launcher did not setup nmt environment variable properly.
3825       if (!MemTracker::check_launcher_nmt_support(tail)) {
3826         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3827       }
3828 
3829       // Verify if nmt option is valid.
3830       if (MemTracker::verify_nmt_option()) {
3831         // Late initialization, still in single-threaded mode.
3832         if (MemTracker::tracking_level() >= NMT_summary) {
3833           MemTracker::init();
3834         }
3835       } else {
3836         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3837       }
3838       continue;
3839     }
3840 #endif
3841 
3842 
3843 #ifndef PRODUCT
3844     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3845       CommandLineFlags::printFlags(tty, true);
3846       vm_exit(0);
3847     }
3848 #endif
3849   }
3850 
3851   if (IgnoreUnrecognizedVMOptions) {
3852     // uncast const to modify the flag args->ignoreUnrecognized
3853     *(jboolean*)(&args->ignoreUnrecognized) = true;
3854   }
3855 
3856   // Parse specified settings file
3857   if (settings_file_specified) {
3858     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3859       return JNI_EINVAL;
3860     }
3861   } else {
3862 #ifdef ASSERT
3863     // Parse default .hotspotrc settings file
3864     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3865       return JNI_EINVAL;
3866     }
3867 #else
3868     struct stat buf;
3869     if (os::stat(hotspotrc, &buf) == 0) {
3870       needs_hotspotrc_warning = true;
3871     }
3872 #endif
3873   }
3874 
3875   if (PrintVMOptions) {
3876     for (index = 0; index < args->nOptions; index++) {
3877       const JavaVMOption *option = args->options + index;
3878       if (match_option(option, "-XX:", &tail)) {
3879         logOption(tail);
3880       }
3881     }
3882   }
3883 
3884   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3885   jint result = parse_vm_init_args(args);
3886   if (result != JNI_OK) {
3887     return result;
3888   }
3889 
3890   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3891   SharedArchivePath = get_shared_archive_path();
3892   if (SharedArchivePath == NULL) {
3893     return JNI_ENOMEM;
3894   }
3895 
3896   // Set up VerifySharedSpaces
3897   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3898     VerifySharedSpaces = true;
3899   }
3900 
3901   // Delay warning until here so that we've had a chance to process
3902   // the -XX:-PrintWarnings flag
3903   if (needs_hotspotrc_warning) {
3904     warning("%s file is present but has been ignored.  "
3905             "Run with -XX:Flags=%s to load the file.",
3906             hotspotrc, hotspotrc);
3907   }
3908 
3909 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3910   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3911 #endif
3912 
3913 #if INCLUDE_ALL_GCS
3914   #if (defined JAVASE_EMBEDDED || defined ARM)
3915     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3916   #endif
3917 #endif
3918 
3919 #ifndef PRODUCT
3920   if (TraceBytecodesAt != 0) {
3921     TraceBytecodes = true;
3922   }
3923   if (CountCompiledCalls) {
3924     if (UseCounterDecay) {
3925       warning("UseCounterDecay disabled because CountCalls is set");
3926       UseCounterDecay = false;
3927     }
3928   }
3929 #endif // PRODUCT
3930 
3931   if (ScavengeRootsInCode == 0) {
3932     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3933       warning("forcing ScavengeRootsInCode non-zero");
3934     }
3935     ScavengeRootsInCode = 1;
3936   }
3937 
3938   if (PrintGCDetails) {
3939     // Turn on -verbose:gc options as well
3940     PrintGC = true;
3941   }
3942 
3943   // Set object alignment values.
3944   set_object_alignment();
3945 
3946 #if !INCLUDE_ALL_GCS
3947   force_serial_gc();
3948 #endif // INCLUDE_ALL_GCS
3949 #if !INCLUDE_CDS
3950   if (DumpSharedSpaces || RequireSharedSpaces) {
3951     jio_fprintf(defaultStream::error_stream(),
3952       "Shared spaces are not supported in this VM\n");
3953     return JNI_ERR;
3954   }
3955   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3956     warning("Shared spaces are not supported in this VM");
3957     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3958     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3959   }
3960   no_shared_spaces("CDS Disabled");
3961 #endif // INCLUDE_CDS
3962 
3963   return JNI_OK;
3964 }
3965 
3966 jint Arguments::apply_ergo() {
3967 
3968   // Set flags based on ergonomics.
3969   set_ergonomics_flags();
3970 
3971   set_shared_spaces_flags();
3972 
3973   // Check the GC selections again.
3974   if (!ArgumentsExt::check_gc_consistency_ergo()) {
3975     return JNI_EINVAL;
3976   }
3977 
3978   if (TieredCompilation) {
3979     set_tiered_flags();
3980   } else {
3981     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3982     if (CompilationPolicyChoice >= 2) {
3983       vm_exit_during_initialization(
3984         "Incompatible compilation policy selected", NULL);
3985     }
3986     // Scale CompileThreshold
3987     if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3988       FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
3989     }
3990   }
3991 
3992 #ifdef COMPILER2
3993 #ifndef PRODUCT
3994   if (PrintIdealGraphLevel > 0) {
3995     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3996   }
3997 #endif
3998 #endif
3999 
4000   // Set heap size based on available physical memory
4001   set_heap_size();
4002 
4003   ArgumentsExt::set_gc_specific_flags();
4004 
4005   // Initialize Metaspace flags and alignments
4006   Metaspace::ergo_initialize();
4007 
4008   // Set bytecode rewriting flags
4009   set_bytecode_flags();
4010 
4011   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4012   set_aggressive_opts_flags();
4013 
4014   // Turn off biased locking for locking debug mode flags,
4015   // which are subtly different from each other but neither works with
4016   // biased locking
4017   if (UseHeavyMonitors
4018 #ifdef COMPILER1
4019       || !UseFastLocking
4020 #endif // COMPILER1
4021     ) {
4022     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4023       // flag set to true on command line; warn the user that they
4024       // can't enable biased locking here
4025       warning("Biased Locking is not supported with locking debug flags"
4026               "; ignoring UseBiasedLocking flag." );
4027     }
4028     UseBiasedLocking = false;
4029   }
4030 
4031 #ifdef ZERO
4032   // Clear flags not supported on zero.
4033   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4034   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4035   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4036   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4037 #endif // CC_INTERP
4038 
4039 #ifdef COMPILER2
4040   if (!EliminateLocks) {
4041     EliminateNestedLocks = false;
4042   }
4043   if (!Inline) {
4044     IncrementalInline = false;
4045   }
4046 #ifndef PRODUCT
4047   if (!IncrementalInline) {
4048     AlwaysIncrementalInline = false;
4049   }
4050 #endif
4051   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4052     // nothing to use the profiling, turn if off
4053     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4054   }
4055 #endif
4056 
4057   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4058     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4059     DebugNonSafepoints = true;
4060   }
4061 
4062   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4063     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4064   }
4065 
4066 #ifndef PRODUCT
4067   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4068     if (use_vm_log()) {
4069       LogVMOutput = true;
4070     }
4071   }
4072 #endif // PRODUCT
4073 
4074   if (PrintCommandLineFlags) {
4075     CommandLineFlags::printSetFlags(tty);
4076   }
4077 
4078   // Apply CPU specific policy for the BiasedLocking
4079   if (UseBiasedLocking) {
4080     if (!VM_Version::use_biased_locking() &&
4081         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4082       UseBiasedLocking = false;
4083     }
4084   }
4085 #ifdef COMPILER2
4086   if (!UseBiasedLocking || EmitSync != 0) {
4087     UseOptoBiasInlining = false;
4088   }
4089 #endif
4090 
4091   return JNI_OK;
4092 }
4093 
4094 jint Arguments::adjust_after_os() {
4095   if (UseNUMA) {
4096     if (UseParallelGC || UseParallelOldGC) {
4097       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4098          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4099       }
4100     }
4101     // UseNUMAInterleaving is set to ON for all collectors and
4102     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4103     // such as the parallel collector for Linux and Solaris will
4104     // interleave old gen and survivor spaces on top of NUMA
4105     // allocation policy for the eden space.
4106     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4107     // all platforms and ParallelGC on Windows will interleave all
4108     // of the heap spaces across NUMA nodes.
4109     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4110       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4111     }
4112   }
4113   return JNI_OK;
4114 }
4115 
4116 int Arguments::PropertyList_count(SystemProperty* pl) {
4117   int count = 0;
4118   while(pl != NULL) {
4119     count++;
4120     pl = pl->next();
4121   }
4122   return count;
4123 }
4124 
4125 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4126   assert(key != NULL, "just checking");
4127   SystemProperty* prop;
4128   for (prop = pl; prop != NULL; prop = prop->next()) {
4129     if (strcmp(key, prop->key()) == 0) return prop->value();
4130   }
4131   return NULL;
4132 }
4133 
4134 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4135   int count = 0;
4136   const char* ret_val = NULL;
4137 
4138   while(pl != NULL) {
4139     if(count >= index) {
4140       ret_val = pl->key();
4141       break;
4142     }
4143     count++;
4144     pl = pl->next();
4145   }
4146 
4147   return ret_val;
4148 }
4149 
4150 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4151   int count = 0;
4152   char* ret_val = NULL;
4153 
4154   while(pl != NULL) {
4155     if(count >= index) {
4156       ret_val = pl->value();
4157       break;
4158     }
4159     count++;
4160     pl = pl->next();
4161   }
4162 
4163   return ret_val;
4164 }
4165 
4166 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4167   SystemProperty* p = *plist;
4168   if (p == NULL) {
4169     *plist = new_p;
4170   } else {
4171     while (p->next() != NULL) {
4172       p = p->next();
4173     }
4174     p->set_next(new_p);
4175   }
4176 }
4177 
4178 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4179   if (plist == NULL)
4180     return;
4181 
4182   SystemProperty* new_p = new SystemProperty(k, v, true);
4183   PropertyList_add(plist, new_p);
4184 }
4185 
4186 void Arguments::PropertyList_add(SystemProperty *element) {
4187   PropertyList_add(&_system_properties, element);
4188 }
4189 
4190 // This add maintains unique property key in the list.
4191 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4192   if (plist == NULL)
4193     return;
4194 
4195   // If property key exist then update with new value.
4196   SystemProperty* prop;
4197   for (prop = *plist; prop != NULL; prop = prop->next()) {
4198     if (strcmp(k, prop->key()) == 0) {
4199       if (append) {
4200         prop->append_value(v);
4201       } else {
4202         prop->set_value(v);
4203       }
4204       return;
4205     }
4206   }
4207 
4208   PropertyList_add(plist, k, v);
4209 }
4210 
4211 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4212 // Returns true if all of the source pointed by src has been copied over to
4213 // the destination buffer pointed by buf. Otherwise, returns false.
4214 // Notes:
4215 // 1. If the length (buflen) of the destination buffer excluding the
4216 // NULL terminator character is not long enough for holding the expanded
4217 // pid characters, it also returns false instead of returning the partially
4218 // expanded one.
4219 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4220 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4221                                 char* buf, size_t buflen) {
4222   const char* p = src;
4223   char* b = buf;
4224   const char* src_end = &src[srclen];
4225   char* buf_end = &buf[buflen - 1];
4226 
4227   while (p < src_end && b < buf_end) {
4228     if (*p == '%') {
4229       switch (*(++p)) {
4230       case '%':         // "%%" ==> "%"
4231         *b++ = *p++;
4232         break;
4233       case 'p':  {       //  "%p" ==> current process id
4234         // buf_end points to the character before the last character so
4235         // that we could write '\0' to the end of the buffer.
4236         size_t buf_sz = buf_end - b + 1;
4237         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4238 
4239         // if jio_snprintf fails or the buffer is not long enough to hold
4240         // the expanded pid, returns false.
4241         if (ret < 0 || ret >= (int)buf_sz) {
4242           return false;
4243         } else {
4244           b += ret;
4245           assert(*b == '\0', "fail in copy_expand_pid");
4246           if (p == src_end && b == buf_end + 1) {
4247             // reach the end of the buffer.
4248             return true;
4249           }
4250         }
4251         p++;
4252         break;
4253       }
4254       default :
4255         *b++ = '%';
4256       }
4257     } else {
4258       *b++ = *p++;
4259     }
4260   }
4261   *b = '\0';
4262   return (p == src_end); // return false if not all of the source was copied
4263 }