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 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  61 do {                                                                  \
  62   if (gc) {                                                           \
  63     if (FLAG_IS_CMDLINE(gc)) {                                        \
  64       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  65     }                                                                 \
  66     FLAG_SET_DEFAULT(gc, false);                                      \
  67   }                                                                   \
  68 } while(0)
  69 
  70 char**  Arguments::_jvm_flags_array             = NULL;
  71 int     Arguments::_num_jvm_flags               = 0;
  72 char**  Arguments::_jvm_args_array              = NULL;
  73 int     Arguments::_num_jvm_args                = 0;
  74 char*  Arguments::_java_command                 = NULL;
  75 SystemProperty* Arguments::_system_properties   = NULL;
  76 const char*  Arguments::_gc_log_filename        = NULL;
  77 bool   Arguments::_has_profile                  = false;
  78 size_t Arguments::_conservative_max_heap_alignment = 0;
  79 uintx  Arguments::_min_heap_size                = 0;
  80 uintx  Arguments::_min_heap_free_ratio          = 0;
  81 uintx  Arguments::_max_heap_free_ratio          = 0;
  82 Arguments::Mode Arguments::_mode                = _mixed;
  83 bool   Arguments::_java_compiler                = false;
  84 bool   Arguments::_xdebug_mode                  = false;
  85 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  86 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  87 int    Arguments::_sun_java_launcher_pid        = -1;
  88 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
  89 
  90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
  91 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  92 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  93 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  94 bool   Arguments::_ClipInlining                 = ClipInlining;
  95 
  96 char*  Arguments::SharedArchivePath             = NULL;
  97 
  98 AgentLibraryList Arguments::_libraryList;
  99 AgentLibraryList Arguments::_agentList;
 100 
 101 abort_hook_t     Arguments::_abort_hook         = NULL;
 102 exit_hook_t      Arguments::_exit_hook          = NULL;
 103 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 104 
 105 
 106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 107 SystemProperty *Arguments::_java_library_path = NULL;
 108 SystemProperty *Arguments::_java_home = NULL;
 109 SystemProperty *Arguments::_java_class_path = NULL;
 110 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 111 
 112 char* Arguments::_ext_dirs = NULL;
 113 
 114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 115 // part of the option string.
 116 static bool match_option(const JavaVMOption *option, const char* name,
 117                          const char** tail) {
 118   int len = (int)strlen(name);
 119   if (strncmp(option->optionString, name, len) == 0) {
 120     *tail = option->optionString + len;
 121     return true;
 122   } else {
 123     return false;
 124   }
 125 }
 126 
 127 // Check if 'option' matches 'name'. No "tail" is allowed.
 128 static bool match_option(const JavaVMOption *option, const char* name) {
 129   const char* tail = NULL;
 130   bool result = match_option(option, name, &tail);
 131   if (tail != NULL && *tail == '\0') {
 132     return result;
 133   } else {
 134     return false;
 135   }
 136 }
 137 
 138 // Return true if any of the strings in null-terminated array 'names' matches.
 139 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 140 // the option must match exactly.
 141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 142   bool tail_allowed) {
 143   for (/* empty */; *names != NULL; ++names) {
 144     if (match_option(option, *names, tail)) {
 145       if (**tail == '\0' || tail_allowed && **tail == ':') {
 146         return true;
 147       }
 148     }
 149   }
 150   return false;
 151 }
 152 
 153 static void logOption(const char* opt) {
 154   if (PrintVMOptions) {
 155     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 156   }
 157 }
 158 
 159 // Process java launcher properties.
 160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 161   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 162   // sun.java.launcher.pid is defined.
 163   // Must do this before setting up other system properties,
 164   // as some of them may depend on launcher type.
 165   for (int index = 0; index < args->nOptions; index++) {
 166     const JavaVMOption* option = args->options + index;
 167     const char* tail;
 168 
 169     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 170       process_java_launcher_argument(tail, option->extraInfo);
 171       continue;
 172     }
 173     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 174       if (strcmp(tail, "true") == 0) {
 175         _sun_java_launcher_is_altjvm = true;
 176       }
 177       continue;
 178     }
 179     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 180       _sun_java_launcher_pid = atoi(tail);
 181       continue;
 182     }
 183   }
 184 }
 185 
 186 // Initialize system properties key and value.
 187 void Arguments::init_system_properties() {
 188 
 189   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 190                                                                  "Java Virtual Machine Specification",  false));
 191   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 192   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 193   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 194 
 195   // Following are JVMTI agent writable properties.
 196   // Properties values are set to NULL and they are
 197   // os specific they are initialized in os::init_system_properties_values().
 198   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 199   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 200   _java_home =  new SystemProperty("java.home", NULL,  true);
 201   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 202 
 203   _java_class_path = new SystemProperty("java.class.path", "",  true);
 204 
 205   // Add to System Property list.
 206   PropertyList_add(&_system_properties, _sun_boot_library_path);
 207   PropertyList_add(&_system_properties, _java_library_path);
 208   PropertyList_add(&_system_properties, _java_home);
 209   PropertyList_add(&_system_properties, _java_class_path);
 210   PropertyList_add(&_system_properties, _sun_boot_class_path);
 211 
 212   // Set OS specific system properties values
 213   os::init_system_properties_values();
 214 }
 215 
 216 
 217   // Update/Initialize System properties after JDK version number is known
 218 void Arguments::init_version_specific_system_properties() {
 219   enum { bufsz = 16 };
 220   char buffer[bufsz];
 221   const char* spec_vendor = "Sun Microsystems Inc.";
 222   uint32_t spec_version = 0;
 223 
 224   spec_vendor = "Oracle Corporation";
 225   spec_version = JDK_Version::current().major_version();
 226   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 227 
 228   PropertyList_add(&_system_properties,
 229       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 230   PropertyList_add(&_system_properties,
 231       new SystemProperty("java.vm.specification.version", buffer, false));
 232   PropertyList_add(&_system_properties,
 233       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 234 }
 235 
 236 /**
 237  * Provide a slightly more user-friendly way of eliminating -XX flags.
 238  * When a flag is eliminated, it can be added to this list in order to
 239  * continue accepting this flag on the command-line, while issuing a warning
 240  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 241  * limit, we flatly refuse to admit the existence of the flag.  This allows
 242  * a flag to die correctly over JDK releases using HSX.
 243  */
 244 typedef struct {
 245   const char* name;
 246   JDK_Version obsoleted_in; // when the flag went away
 247   JDK_Version accept_until; // which version to start denying the existence
 248 } ObsoleteFlag;
 249 
 250 static ObsoleteFlag obsolete_jvm_flags[] = {
 251   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 252   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 253   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 254   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 255   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 256   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 257   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 258   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 259   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 260   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 261   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 262   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 263   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 264   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 265   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 266   { "DefaultInitialRAMFraction",
 267                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 268   { "UseDepthFirstScavengeOrder",
 269                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 270   { "HandlePromotionFailure",
 271                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 272   { "MaxLiveObjectEvacuationRatio",
 273                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 274   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 275   { "UseParallelOldGCCompacting",
 276                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 277   { "UseParallelDensePrefixUpdate",
 278                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 279   { "UseParallelOldGCDensePrefix",
 280                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 281   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 282   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 283   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 284   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 285   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 286   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 287   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 288   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 289   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 290   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 291   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 292   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 293   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 294   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 295   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 296   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 297   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 298   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 299   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 300   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 301   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 302   { "SafepointPollOffset",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 303 #ifdef PRODUCT
 304   { "DesiredMethodLimit",
 305                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 306 #endif // PRODUCT
 307   { "UseVMInterruptibleIO",          JDK_Version::jdk(8), JDK_Version::jdk(9) },
 308   { "UseBoundThreads",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 309   { "DefaultThreadPriority",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 310   { "NoYieldsInMicrolock",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 311   { "BackEdgeThreshold",             JDK_Version::jdk(9), JDK_Version::jdk(10) },
 312   { "UseNewReflection",              JDK_Version::jdk(9), JDK_Version::jdk(10) },
 313   { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
 314   { "VerifyReflectionBytecodes",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 315   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 316   { "NmethodSweepFraction",          JDK_Version::jdk(9), JDK_Version::jdk(10) },
 317   { "NmethodSweepCheckInterval",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 318   { "CodeCacheMinimumFreeSpace",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 319 #ifndef ZERO
 320   { "UseFastAccessorMethods",        JDK_Version::jdk(9), JDK_Version::jdk(10) },
 321   { "UseFastEmptyMethods",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 322 #endif // ZERO
 323   { "UseCompilerSafepoints",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 324   { NULL, JDK_Version(0), JDK_Version(0) }
 325 };
 326 
 327 // Returns true if the flag is obsolete and fits into the range specified
 328 // for being ignored.  In the case that the flag is ignored, the 'version'
 329 // value is filled in with the version number when the flag became
 330 // obsolete so that that value can be displayed to the user.
 331 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 332   int i = 0;
 333   assert(version != NULL, "Must provide a version buffer");
 334   while (obsolete_jvm_flags[i].name != NULL) {
 335     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 336     // <flag>=xxx form
 337     // [-|+]<flag> form
 338     size_t len = strlen(flag_status.name);
 339     if (((strncmp(flag_status.name, s, len) == 0) &&
 340          (strlen(s) == len)) ||
 341         ((s[0] == '+' || s[0] == '-') &&
 342          (strncmp(flag_status.name, &s[1], len) == 0) &&
 343          (strlen(&s[1]) == len))) {
 344       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 345           *version = flag_status.obsoleted_in;
 346           return true;
 347       }
 348     }
 349     i++;
 350   }
 351   return false;
 352 }
 353 
 354 // Constructs the system class path (aka boot class path) from the following
 355 // components, in order:
 356 //
 357 //     prefix           // from -Xbootclasspath/p:...
 358 //     base             // from os::get_system_properties() or -Xbootclasspath=
 359 //     suffix           // from -Xbootclasspath/a:...
 360 //
 361 // This could be AllStatic, but it isn't needed after argument processing is
 362 // complete.
 363 class SysClassPath: public StackObj {
 364 public:
 365   SysClassPath(const char* base);
 366   ~SysClassPath();
 367 
 368   inline void set_base(const char* base);
 369   inline void add_prefix(const char* prefix);
 370   inline void add_suffix_to_prefix(const char* suffix);
 371   inline void add_suffix(const char* suffix);
 372   inline void reset_path(const char* base);
 373 
 374   inline const char* get_base()     const { return _items[_scp_base]; }
 375   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 376   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 377 
 378   // Combine all the components into a single c-heap-allocated string; caller
 379   // must free the string if/when no longer needed.
 380   char* combined_path();
 381 
 382 private:
 383   // Utility routines.
 384   static char* add_to_path(const char* path, const char* str, bool prepend);
 385   static char* add_jars_to_path(char* path, const char* directory);
 386 
 387   inline void reset_item_at(int index);
 388 
 389   // Array indices for the items that make up the sysclasspath.  All except the
 390   // base are allocated in the C heap and freed by this class.
 391   enum {
 392     _scp_prefix,        // from -Xbootclasspath/p:...
 393     _scp_base,          // the default sysclasspath
 394     _scp_suffix,        // from -Xbootclasspath/a:...
 395     _scp_nitems         // the number of items, must be last.
 396   };
 397 
 398   const char* _items[_scp_nitems];
 399 };
 400 
 401 SysClassPath::SysClassPath(const char* base) {
 402   memset(_items, 0, sizeof(_items));
 403   _items[_scp_base] = base;
 404 }
 405 
 406 SysClassPath::~SysClassPath() {
 407   // Free everything except the base.
 408   for (int i = 0; i < _scp_nitems; ++i) {
 409     if (i != _scp_base) reset_item_at(i);
 410   }
 411 }
 412 
 413 inline void SysClassPath::set_base(const char* base) {
 414   _items[_scp_base] = base;
 415 }
 416 
 417 inline void SysClassPath::add_prefix(const char* prefix) {
 418   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 419 }
 420 
 421 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 422   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 423 }
 424 
 425 inline void SysClassPath::add_suffix(const char* suffix) {
 426   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 427 }
 428 
 429 inline void SysClassPath::reset_item_at(int index) {
 430   assert(index < _scp_nitems && index != _scp_base, "just checking");
 431   if (_items[index] != NULL) {
 432     FREE_C_HEAP_ARRAY(char, _items[index]);
 433     _items[index] = NULL;
 434   }
 435 }
 436 
 437 inline void SysClassPath::reset_path(const char* base) {
 438   // Clear the prefix and suffix.
 439   reset_item_at(_scp_prefix);
 440   reset_item_at(_scp_suffix);
 441   set_base(base);
 442 }
 443 
 444 //------------------------------------------------------------------------------
 445 
 446 
 447 // Combine the bootclasspath elements, some of which may be null, into a single
 448 // c-heap-allocated string.
 449 char* SysClassPath::combined_path() {
 450   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 451 
 452   size_t lengths[_scp_nitems];
 453   size_t total_len = 0;
 454 
 455   const char separator = *os::path_separator();
 456 
 457   // Get the lengths.
 458   int i;
 459   for (i = 0; i < _scp_nitems; ++i) {
 460     if (_items[i] != NULL) {
 461       lengths[i] = strlen(_items[i]);
 462       // Include space for the separator char (or a NULL for the last item).
 463       total_len += lengths[i] + 1;
 464     }
 465   }
 466   assert(total_len > 0, "empty sysclasspath not allowed");
 467 
 468   // Copy the _items to a single string.
 469   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 470   char* cp_tmp = cp;
 471   for (i = 0; i < _scp_nitems; ++i) {
 472     if (_items[i] != NULL) {
 473       memcpy(cp_tmp, _items[i], lengths[i]);
 474       cp_tmp += lengths[i];
 475       *cp_tmp++ = separator;
 476     }
 477   }
 478   *--cp_tmp = '\0';     // Replace the extra separator.
 479   return cp;
 480 }
 481 
 482 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 483 char*
 484 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 485   char *cp;
 486 
 487   assert(str != NULL, "just checking");
 488   if (path == NULL) {
 489     size_t len = strlen(str) + 1;
 490     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 491     memcpy(cp, str, len);                       // copy the trailing null
 492   } else {
 493     const char separator = *os::path_separator();
 494     size_t old_len = strlen(path);
 495     size_t str_len = strlen(str);
 496     size_t len = old_len + str_len + 2;
 497 
 498     if (prepend) {
 499       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 500       char* cp_tmp = cp;
 501       memcpy(cp_tmp, str, str_len);
 502       cp_tmp += str_len;
 503       *cp_tmp = separator;
 504       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 505       FREE_C_HEAP_ARRAY(char, path);
 506     } else {
 507       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 508       char* cp_tmp = cp + old_len;
 509       *cp_tmp = separator;
 510       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 511     }
 512   }
 513   return cp;
 514 }
 515 
 516 // Scan the directory and append any jar or zip files found to path.
 517 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 518 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 519   DIR* dir = os::opendir(directory);
 520   if (dir == NULL) return path;
 521 
 522   char dir_sep[2] = { '\0', '\0' };
 523   size_t directory_len = strlen(directory);
 524   const char fileSep = *os::file_separator();
 525   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 526 
 527   /* Scan the directory for jars/zips, appending them to path. */
 528   struct dirent *entry;
 529   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 530   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 531     const char* name = entry->d_name;
 532     const char* ext = name + strlen(name) - 4;
 533     bool isJarOrZip = ext > name &&
 534       (os::file_name_strcmp(ext, ".jar") == 0 ||
 535        os::file_name_strcmp(ext, ".zip") == 0);
 536     if (isJarOrZip) {
 537       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 538       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 539       path = add_to_path(path, jarpath, false);
 540       FREE_C_HEAP_ARRAY(char, jarpath);
 541     }
 542   }
 543   FREE_C_HEAP_ARRAY(char, dbuf);
 544   os::closedir(dir);
 545   return path;
 546 }
 547 
 548 // Parses a memory size specification string.
 549 static bool atomull(const char *s, julong* result) {
 550   julong n = 0;
 551   int args_read = 0;
 552   bool is_hex = false;
 553   // Skip leading 0[xX] for hexadecimal
 554   if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
 555     s += 2;
 556     is_hex = true;
 557     args_read = sscanf(s, JULONG_FORMAT_X, &n);
 558   } else {
 559     args_read = sscanf(s, JULONG_FORMAT, &n);
 560   }
 561   if (args_read != 1) {
 562     return false;
 563   }
 564   while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
 565     s++;
 566   }
 567   // 4705540: illegal if more characters are found after the first non-digit
 568   if (strlen(s) > 1) {
 569     return false;
 570   }
 571   switch (*s) {
 572     case 'T': case 't':
 573       *result = n * G * K;
 574       // Check for overflow.
 575       if (*result/((julong)G * K) != n) return false;
 576       return true;
 577     case 'G': case 'g':
 578       *result = n * G;
 579       if (*result/G != n) return false;
 580       return true;
 581     case 'M': case 'm':
 582       *result = n * M;
 583       if (*result/M != n) return false;
 584       return true;
 585     case 'K': case 'k':
 586       *result = n * K;
 587       if (*result/K != n) return false;
 588       return true;
 589     case '\0':
 590       *result = n;
 591       return true;
 592     default:
 593       return false;
 594   }
 595 }
 596 
 597 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 598   if (size < min_size) return arg_too_small;
 599   // Check that size will fit in a size_t (only relevant on 32-bit)
 600   if (size > max_uintx) return arg_too_big;
 601   return arg_in_range;
 602 }
 603 
 604 // Describe an argument out of range error
 605 void Arguments::describe_range_error(ArgsRange errcode) {
 606   switch(errcode) {
 607   case arg_too_big:
 608     jio_fprintf(defaultStream::error_stream(),
 609                 "The specified size exceeds the maximum "
 610                 "representable size.\n");
 611     break;
 612   case arg_too_small:
 613   case arg_unreadable:
 614   case arg_in_range:
 615     // do nothing for now
 616     break;
 617   default:
 618     ShouldNotReachHere();
 619   }
 620 }
 621 
 622 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 623   return CommandLineFlags::boolAtPut(name, &value, origin);
 624 }
 625 
 626 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 627   double v;
 628   if (sscanf(value, "%lf", &v) != 1) {
 629     return false;
 630   }
 631 
 632   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 633     return true;
 634   }
 635   return false;
 636 }
 637 
 638 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 639   julong v;
 640   intx intx_v;
 641   bool is_neg = false;
 642   // Check the sign first since atomull() parses only unsigned values.
 643   if (*value == '-') {
 644     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 645       return false;
 646     }
 647     value++;
 648     is_neg = true;
 649   }
 650   if (!atomull(value, &v)) {
 651     return false;
 652   }
 653   intx_v = (intx) v;
 654   if (is_neg) {
 655     intx_v = -intx_v;
 656   }
 657   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 658     return true;
 659   }
 660   uintx uintx_v = (uintx) v;
 661   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 662     return true;
 663   }
 664   uint64_t uint64_t_v = (uint64_t) v;
 665   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 666     return true;
 667   }
 668   size_t size_t_v = (size_t) v;
 669   if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
 670     return true;
 671   }
 672   return false;
 673 }
 674 
 675 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 676   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 677   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 678   FREE_C_HEAP_ARRAY(char, value);
 679   return true;
 680 }
 681 
 682 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 683   const char* old_value = "";
 684   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 685   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 686   size_t new_len = strlen(new_value);
 687   const char* value;
 688   char* free_this_too = NULL;
 689   if (old_len == 0) {
 690     value = new_value;
 691   } else if (new_len == 0) {
 692     value = old_value;
 693   } else {
 694     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 695     // each new setting adds another LINE to the switch:
 696     sprintf(buf, "%s\n%s", old_value, new_value);
 697     value = buf;
 698     free_this_too = buf;
 699   }
 700   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 701   // CommandLineFlags always returns a pointer that needs freeing.
 702   FREE_C_HEAP_ARRAY(char, value);
 703   if (free_this_too != NULL) {
 704     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 705     FREE_C_HEAP_ARRAY(char, free_this_too);
 706   }
 707   return true;
 708 }
 709 
 710 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 711 
 712   // range of acceptable characters spelled out for portability reasons
 713 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 714 #define BUFLEN 255
 715   char name[BUFLEN+1];
 716   char dummy;
 717 
 718   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 719     return set_bool_flag(name, false, origin);
 720   }
 721   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 722     return set_bool_flag(name, true, origin);
 723   }
 724 
 725   char punct;
 726   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 727     const char* value = strchr(arg, '=') + 1;
 728     Flag* flag = Flag::find_flag(name, strlen(name));
 729     if (flag != NULL && flag->is_ccstr()) {
 730       if (flag->ccstr_accumulates()) {
 731         return append_to_string_flag(name, value, origin);
 732       } else {
 733         if (value[0] == '\0') {
 734           value = NULL;
 735         }
 736         return set_string_flag(name, value, origin);
 737       }
 738     }
 739   }
 740 
 741   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 742     const char* value = strchr(arg, '=') + 1;
 743     // -XX:Foo:=xxx will reset the string flag to the given value.
 744     if (value[0] == '\0') {
 745       value = NULL;
 746     }
 747     return set_string_flag(name, value, origin);
 748   }
 749 
 750 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 751 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 752 #define        NUMBER_RANGE    "[0123456789]"
 753   char value[BUFLEN + 1];
 754   char value2[BUFLEN + 1];
 755   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 756     // Looks like a floating-point number -- try again with more lenient format string
 757     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 758       return set_fp_numeric_flag(name, value, origin);
 759     }
 760   }
 761 
 762 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 763   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 764     return set_numeric_flag(name, value, origin);
 765   }
 766 
 767   return false;
 768 }
 769 
 770 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 771   assert(bldarray != NULL, "illegal argument");
 772 
 773   if (arg == NULL) {
 774     return;
 775   }
 776 
 777   int new_count = *count + 1;
 778 
 779   // expand the array and add arg to the last element
 780   if (*bldarray == NULL) {
 781     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 782   } else {
 783     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 784   }
 785   (*bldarray)[*count] = os::strdup_check_oom(arg);
 786   *count = new_count;
 787 }
 788 
 789 void Arguments::build_jvm_args(const char* arg) {
 790   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 791 }
 792 
 793 void Arguments::build_jvm_flags(const char* arg) {
 794   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 795 }
 796 
 797 // utility function to return a string that concatenates all
 798 // strings in a given char** array
 799 const char* Arguments::build_resource_string(char** args, int count) {
 800   if (args == NULL || count == 0) {
 801     return NULL;
 802   }
 803   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 804   for (int i = 1; i < count; i++) {
 805     length += strlen(args[i]) + 1; // add 1 for a space
 806   }
 807   char* s = NEW_RESOURCE_ARRAY(char, length);
 808   strcpy(s, args[0]);
 809   for (int j = 1; j < count; j++) {
 810     strcat(s, " ");
 811     strcat(s, args[j]);
 812   }
 813   return (const char*) s;
 814 }
 815 
 816 void Arguments::print_on(outputStream* st) {
 817   st->print_cr("VM Arguments:");
 818   if (num_jvm_flags() > 0) {
 819     st->print("jvm_flags: "); print_jvm_flags_on(st);
 820   }
 821   if (num_jvm_args() > 0) {
 822     st->print("jvm_args: "); print_jvm_args_on(st);
 823   }
 824   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 825   if (_java_class_path != NULL) {
 826     char* path = _java_class_path->value();
 827     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 828   }
 829   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 830 }
 831 
 832 void Arguments::print_jvm_flags_on(outputStream* st) {
 833   if (_num_jvm_flags > 0) {
 834     for (int i=0; i < _num_jvm_flags; i++) {
 835       st->print("%s ", _jvm_flags_array[i]);
 836     }
 837     st->cr();
 838   }
 839 }
 840 
 841 void Arguments::print_jvm_args_on(outputStream* st) {
 842   if (_num_jvm_args > 0) {
 843     for (int i=0; i < _num_jvm_args; i++) {
 844       st->print("%s ", _jvm_args_array[i]);
 845     }
 846     st->cr();
 847   }
 848 }
 849 
 850 bool Arguments::process_argument(const char* arg,
 851     jboolean ignore_unrecognized, Flag::Flags origin) {
 852 
 853   JDK_Version since = JDK_Version();
 854 
 855   if (parse_argument(arg, origin) || ignore_unrecognized) {
 856     return true;
 857   }
 858 
 859   bool has_plus_minus = (*arg == '+' || *arg == '-');
 860   const char* const argname = has_plus_minus ? arg + 1 : arg;
 861   if (is_newly_obsolete(arg, &since)) {
 862     char version[256];
 863     since.to_string(version, sizeof(version));
 864     warning("ignoring option %s; support was removed in %s", argname, version);
 865     return true;
 866   }
 867 
 868   // For locked flags, report a custom error message if available.
 869   // Otherwise, report the standard unrecognized VM option.
 870 
 871   size_t arg_len;
 872   const char* equal_sign = strchr(argname, '=');
 873   if (equal_sign == NULL) {
 874     arg_len = strlen(argname);
 875   } else {
 876     arg_len = equal_sign - argname;
 877   }
 878 
 879   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 880   if (found_flag != NULL) {
 881     char locked_message_buf[BUFLEN];
 882     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 883     if (strlen(locked_message_buf) == 0) {
 884       if (found_flag->is_bool() && !has_plus_minus) {
 885         jio_fprintf(defaultStream::error_stream(),
 886           "Missing +/- setting for VM option '%s'\n", argname);
 887       } else if (!found_flag->is_bool() && has_plus_minus) {
 888         jio_fprintf(defaultStream::error_stream(),
 889           "Unexpected +/- setting in VM option '%s'\n", argname);
 890       } else {
 891         jio_fprintf(defaultStream::error_stream(),
 892           "Improperly specified VM option '%s'\n", argname);
 893       }
 894     } else {
 895       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 896     }
 897   } else {
 898     jio_fprintf(defaultStream::error_stream(),
 899                 "Unrecognized VM option '%s'\n", argname);
 900     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 901     if (fuzzy_matched != NULL) {
 902       jio_fprintf(defaultStream::error_stream(),
 903                   "Did you mean '%s%s%s'? ",
 904                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 905                   fuzzy_matched->_name,
 906                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 907       if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
 908         char version[256];
 909         since.to_string(version, sizeof(version));
 910         jio_fprintf(defaultStream::error_stream(),
 911                     "Warning: support for %s was removed in %s\n",
 912                     fuzzy_matched->_name,
 913                     version);
 914     }
 915   }
 916   }
 917 
 918   // allow for commandline "commenting out" options like -XX:#+Verbose
 919   return arg[0] == '#';
 920 }
 921 
 922 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 923   FILE* stream = fopen(file_name, "rb");
 924   if (stream == NULL) {
 925     if (should_exist) {
 926       jio_fprintf(defaultStream::error_stream(),
 927                   "Could not open settings file %s\n", file_name);
 928       return false;
 929     } else {
 930       return true;
 931     }
 932   }
 933 
 934   char token[1024];
 935   int  pos = 0;
 936 
 937   bool in_white_space = true;
 938   bool in_comment     = false;
 939   bool in_quote       = false;
 940   char quote_c        = 0;
 941   bool result         = true;
 942 
 943   int c = getc(stream);
 944   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 945     if (in_white_space) {
 946       if (in_comment) {
 947         if (c == '\n') in_comment = false;
 948       } else {
 949         if (c == '#') in_comment = true;
 950         else if (!isspace(c)) {
 951           in_white_space = false;
 952           token[pos++] = c;
 953         }
 954       }
 955     } else {
 956       if (c == '\n' || (!in_quote && isspace(c))) {
 957         // token ends at newline, or at unquoted whitespace
 958         // this allows a way to include spaces in string-valued options
 959         token[pos] = '\0';
 960         logOption(token);
 961         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 962         build_jvm_flags(token);
 963         pos = 0;
 964         in_white_space = true;
 965         in_quote = false;
 966       } else if (!in_quote && (c == '\'' || c == '"')) {
 967         in_quote = true;
 968         quote_c = c;
 969       } else if (in_quote && (c == quote_c)) {
 970         in_quote = false;
 971       } else {
 972         token[pos++] = c;
 973       }
 974     }
 975     c = getc(stream);
 976   }
 977   if (pos > 0) {
 978     token[pos] = '\0';
 979     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 980     build_jvm_flags(token);
 981   }
 982   fclose(stream);
 983   return result;
 984 }
 985 
 986 //=============================================================================================================
 987 // Parsing of properties (-D)
 988 
 989 const char* Arguments::get_property(const char* key) {
 990   return PropertyList_get_value(system_properties(), key);
 991 }
 992 
 993 bool Arguments::add_property(const char* prop) {
 994   const char* eq = strchr(prop, '=');
 995   char* key;
 996   // ns must be static--its address may be stored in a SystemProperty object.
 997   const static char ns[1] = {0};
 998   char* value = (char *)ns;
 999 
1000   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1001   key = AllocateHeap(key_len + 1, mtInternal);
1002   strncpy(key, prop, key_len);
1003   key[key_len] = '\0';
1004 
1005   if (eq != NULL) {
1006     size_t value_len = strlen(prop) - key_len - 1;
1007     value = AllocateHeap(value_len + 1, mtInternal);
1008     strncpy(value, &prop[key_len + 1], value_len + 1);
1009   }
1010 
1011   if (strcmp(key, "java.compiler") == 0) {
1012     process_java_compiler_argument(value);
1013     FreeHeap(key);
1014     if (eq != NULL) {
1015       FreeHeap(value);
1016     }
1017     return true;
1018   } else if (strcmp(key, "sun.java.command") == 0) {
1019     _java_command = value;
1020 
1021     // Record value in Arguments, but let it get passed to Java.
1022   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1023              strcmp(key, "sun.java.launcher.pid") == 0) {
1024     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1025     // private and are processed in process_sun_java_launcher_properties();
1026     // the sun.java.launcher property is passed on to the java application
1027     FreeHeap(key);
1028     if (eq != NULL) {
1029       FreeHeap(value);
1030     }
1031     return true;
1032   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1033     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1034     // its value without going through the property list or making a Java call.
1035     _java_vendor_url_bug = value;
1036   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1037     PropertyList_unique_add(&_system_properties, key, value, true);
1038     return true;
1039   }
1040   // Create new property and add at the end of the list
1041   PropertyList_unique_add(&_system_properties, key, value);
1042   return true;
1043 }
1044 
1045 //===========================================================================================================
1046 // Setting int/mixed/comp mode flags
1047 
1048 void Arguments::set_mode_flags(Mode mode) {
1049   // Set up default values for all flags.
1050   // If you add a flag to any of the branches below,
1051   // add a default value for it here.
1052   set_java_compiler(false);
1053   _mode                      = mode;
1054 
1055   // Ensure Agent_OnLoad has the correct initial values.
1056   // This may not be the final mode; mode may change later in onload phase.
1057   PropertyList_unique_add(&_system_properties, "java.vm.info",
1058                           (char*)VM_Version::vm_info_string(), false);
1059 
1060   UseInterpreter             = true;
1061   UseCompiler                = true;
1062   UseLoopCounter             = true;
1063 
1064   // Default values may be platform/compiler dependent -
1065   // use the saved values
1066   ClipInlining               = Arguments::_ClipInlining;
1067   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1068   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1069   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1070 
1071   // Change from defaults based on mode
1072   switch (mode) {
1073   default:
1074     ShouldNotReachHere();
1075     break;
1076   case _int:
1077     UseCompiler              = false;
1078     UseLoopCounter           = false;
1079     AlwaysCompileLoopMethods = false;
1080     UseOnStackReplacement    = false;
1081     break;
1082   case _mixed:
1083     // same as default
1084     break;
1085   case _comp:
1086     UseInterpreter           = false;
1087     BackgroundCompilation    = false;
1088     ClipInlining             = false;
1089     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1090     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1091     // compile a level 4 (C2) and then continue executing it.
1092     if (TieredCompilation) {
1093       Tier3InvokeNotifyFreqLog = 0;
1094       Tier4InvocationThreshold = 0;
1095     }
1096     break;
1097   }
1098 }
1099 
1100 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1101 // Conflict: required to use shared spaces (-Xshare:on), but
1102 // incompatible command line options were chosen.
1103 
1104 static void no_shared_spaces(const char* message) {
1105   if (RequireSharedSpaces) {
1106     jio_fprintf(defaultStream::error_stream(),
1107       "Class data sharing is inconsistent with other specified options.\n");
1108     vm_exit_during_initialization("Unable to use shared archive.", message);
1109   } else {
1110     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1111   }
1112 }
1113 #endif
1114 
1115 // Returns threshold scaled with the value of scale.
1116 // If scale < 0.0, threshold is returned without scaling.
1117 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1118   if (scale == 1.0 || scale < 0.0) {
1119     return threshold;
1120   } else {
1121     return (intx)(threshold * scale);
1122   }
1123 }
1124 
1125 // Returns freq_log scaled with the value of scale.
1126 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1127 // If scale < 0.0, freq_log is returned without scaling.
1128 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1129   // Check if scaling is necessary or if negative value was specified.
1130   if (scale == 1.0 || scale < 0.0) {
1131     return freq_log;
1132   }
1133   // Check values to avoid calculating log2 of 0.
1134   if (scale == 0.0 || freq_log == 0) {
1135     return 0;
1136   }
1137   // Determine the maximum notification frequency value currently supported.
1138   // The largest mask value that the interpreter/C1 can handle is
1139   // of length InvocationCounter::number_of_count_bits. Mask values are always
1140   // one bit shorter then the value of the notification frequency. Set
1141   // max_freq_bits accordingly.
1142   intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1143   intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1144   if (scaled_freq == 0) {
1145     // Return 0 right away to avoid calculating log2 of 0.
1146     return 0;
1147   } else if (scaled_freq > nth_bit(max_freq_bits)) {
1148     return max_freq_bits;
1149   } else {
1150     return log2_intptr(scaled_freq);
1151   }
1152 }
1153 
1154 void Arguments::set_tiered_flags() {
1155   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1156   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1157     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1158   }
1159   if (CompilationPolicyChoice < 2) {
1160     vm_exit_during_initialization(
1161       "Incompatible compilation policy selected", NULL);
1162   }
1163   // Increase the code cache size - tiered compiles a lot more.
1164   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1165     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1166                   MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1167   }
1168   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1169   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1170     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1171 
1172     if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1173       // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1174       if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1175         FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1176       }
1177       if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1178         FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1179       }
1180       // Check consistency of code heap sizes
1181       if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1182         jio_fprintf(defaultStream::error_stream(),
1183                     "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1184                     NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1185                     (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1186         vm_exit(1);
1187       }
1188     }
1189   }
1190   if (!UseInterpreter) { // -Xcomp
1191     Tier3InvokeNotifyFreqLog = 0;
1192     Tier4InvocationThreshold = 0;
1193   }
1194 
1195   if (CompileThresholdScaling < 0) {
1196     vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1197   }
1198 
1199   // Scale tiered compilation thresholds.
1200   // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1201   if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1202     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1203     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1204 
1205     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1206     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1207     FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1208     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1209 
1210     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1211     // once these thresholds become supported.
1212 
1213     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1214     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1215 
1216     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1217     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1218 
1219     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1220 
1221     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1222     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1223     FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1224     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1225   }
1226 }
1227 
1228 /**
1229  * Returns the minimum number of compiler threads needed to run the JVM. The following
1230  * configurations are possible.
1231  *
1232  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1233  *    compiler threads is 0.
1234  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1235  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1236  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1237  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1238  *    C1 can be used, so the minimum number of compiler threads is 1.
1239  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1240  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1241  *    the minimum number of compiler threads is 2.
1242  */
1243 int Arguments::get_min_number_of_compiler_threads() {
1244 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1245   return 0;   // case 1
1246 #else
1247   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1248     return 1; // case 2 or case 3
1249   }
1250   return 2;   // case 4 (tiered)
1251 #endif
1252 }
1253 
1254 #if INCLUDE_ALL_GCS
1255 static void disable_adaptive_size_policy(const char* collector_name) {
1256   if (UseAdaptiveSizePolicy) {
1257     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1258       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1259               collector_name);
1260     }
1261     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1262   }
1263 }
1264 
1265 void Arguments::set_parnew_gc_flags() {
1266   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1267          "control point invariant");
1268   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1269   assert(UseParNewGC, "ParNew should always be used with CMS");
1270 
1271   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1272     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1273     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1274   } else if (ParallelGCThreads == 0) {
1275     jio_fprintf(defaultStream::error_stream(),
1276         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1277     vm_exit(1);
1278   }
1279 
1280   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1281   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1282   // we set them to 1024 and 1024.
1283   // See CR 6362902.
1284   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1285     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1286   }
1287   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1288     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1289   }
1290 
1291   // When using compressed oops, we use local overflow stacks,
1292   // rather than using a global overflow list chained through
1293   // the klass word of the object's pre-image.
1294   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1295     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1296       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1297     }
1298     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1299   }
1300   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1301 }
1302 
1303 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1304 // sparc/solaris for certain applications, but would gain from
1305 // further optimization and tuning efforts, and would almost
1306 // certainly gain from analysis of platform and environment.
1307 void Arguments::set_cms_and_parnew_gc_flags() {
1308   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1309   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1310   assert(UseParNewGC, "ParNew should always be used with CMS");
1311 
1312   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1313   disable_adaptive_size_policy("UseConcMarkSweepGC");
1314 
1315   set_parnew_gc_flags();
1316 
1317   size_t max_heap = align_size_down(MaxHeapSize,
1318                                     CardTableRS::ct_max_alignment_constraint());
1319 
1320   // Now make adjustments for CMS
1321   intx   tenuring_default = (intx)6;
1322   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1323 
1324   // Preferred young gen size for "short" pauses:
1325   // upper bound depends on # of threads and NewRatio.
1326   const uintx parallel_gc_threads =
1327     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1328   const size_t preferred_max_new_size_unaligned =
1329     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1330   size_t preferred_max_new_size =
1331     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1332 
1333   // Unless explicitly requested otherwise, size young gen
1334   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1335 
1336   // If either MaxNewSize or NewRatio is set on the command line,
1337   // assume the user is trying to set the size of the young gen.
1338   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1339 
1340     // Set MaxNewSize to our calculated preferred_max_new_size unless
1341     // NewSize was set on the command line and it is larger than
1342     // preferred_max_new_size.
1343     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1344       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1345     } else {
1346       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1347     }
1348     if (PrintGCDetails && Verbose) {
1349       // Too early to use gclog_or_tty
1350       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1351     }
1352 
1353     // Code along this path potentially sets NewSize and OldSize
1354     if (PrintGCDetails && Verbose) {
1355       // Too early to use gclog_or_tty
1356       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1357            " initial_heap_size:  " SIZE_FORMAT
1358            " max_heap: " SIZE_FORMAT,
1359            min_heap_size(), InitialHeapSize, max_heap);
1360     }
1361     size_t min_new = preferred_max_new_size;
1362     if (FLAG_IS_CMDLINE(NewSize)) {
1363       min_new = NewSize;
1364     }
1365     if (max_heap > min_new && min_heap_size() > min_new) {
1366       // Unless explicitly requested otherwise, make young gen
1367       // at least min_new, and at most preferred_max_new_size.
1368       if (FLAG_IS_DEFAULT(NewSize)) {
1369         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1370         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1371         if (PrintGCDetails && Verbose) {
1372           // Too early to use gclog_or_tty
1373           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1374         }
1375       }
1376       // Unless explicitly requested otherwise, size old gen
1377       // so it's NewRatio x of NewSize.
1378       if (FLAG_IS_DEFAULT(OldSize)) {
1379         if (max_heap > NewSize) {
1380           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1381           if (PrintGCDetails && Verbose) {
1382             // Too early to use gclog_or_tty
1383             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1384           }
1385         }
1386       }
1387     }
1388   }
1389   // Unless explicitly requested otherwise, definitely
1390   // promote all objects surviving "tenuring_default" scavenges.
1391   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1392       FLAG_IS_DEFAULT(SurvivorRatio)) {
1393     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1394   }
1395   // If we decided above (or user explicitly requested)
1396   // `promote all' (via MaxTenuringThreshold := 0),
1397   // prefer minuscule survivor spaces so as not to waste
1398   // space for (non-existent) survivors
1399   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1400     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1401   }
1402 
1403   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1404   // but rather the number of free blocks of a given size that are used when
1405   // replenishing the local per-worker free list caches.
1406   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1407     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1408       // OldPLAB sizing manually turned off: Use a larger default setting,
1409       // unless it was manually specified. This is because a too-low value
1410       // will slow down scavenges.
1411       FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1412     } else {
1413       FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1414     }
1415   }
1416 
1417   // If either of the static initialization defaults have changed, note this
1418   // modification.
1419   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1420     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1421   }
1422   if (PrintGCDetails && Verbose) {
1423     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1424       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1425     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1426   }
1427 }
1428 #endif // INCLUDE_ALL_GCS
1429 
1430 void set_object_alignment() {
1431   // Object alignment.
1432   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1433   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1434   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1435   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1436   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1437   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1438 
1439   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1440   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1441 
1442   // Oop encoding heap max
1443   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1444 
1445 #if INCLUDE_ALL_GCS
1446   // Set CMS global values
1447   CompactibleFreeListSpace::set_cms_values();
1448 #endif // INCLUDE_ALL_GCS
1449 }
1450 
1451 bool verify_object_alignment() {
1452   // Object alignment.
1453   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1454     jio_fprintf(defaultStream::error_stream(),
1455                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1456                 (int)ObjectAlignmentInBytes);
1457     return false;
1458   }
1459   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1460     jio_fprintf(defaultStream::error_stream(),
1461                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1462                 (int)ObjectAlignmentInBytes, BytesPerLong);
1463     return false;
1464   }
1465   // It does not make sense to have big object alignment
1466   // since a space lost due to alignment will be greater
1467   // then a saved space from compressed oops.
1468   if ((int)ObjectAlignmentInBytes > 256) {
1469     jio_fprintf(defaultStream::error_stream(),
1470                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1471                 (int)ObjectAlignmentInBytes);
1472     return false;
1473   }
1474   // In case page size is very small.
1475   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1476     jio_fprintf(defaultStream::error_stream(),
1477                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1478                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1479     return false;
1480   }
1481   if(SurvivorAlignmentInBytes == 0) {
1482     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1483   } else {
1484     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1485       jio_fprintf(defaultStream::error_stream(),
1486             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1487             (int)SurvivorAlignmentInBytes);
1488       return false;
1489     }
1490     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1491       jio_fprintf(defaultStream::error_stream(),
1492           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1493           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1494       return false;
1495     }
1496   }
1497   return true;
1498 }
1499 
1500 size_t Arguments::max_heap_for_compressed_oops() {
1501   // Avoid sign flip.
1502   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1503   // We need to fit both the NULL page and the heap into the memory budget, while
1504   // keeping alignment constraints of the heap. To guarantee the latter, as the
1505   // NULL page is located before the heap, we pad the NULL page to the conservative
1506   // maximum alignment that the GC may ever impose upon the heap.
1507   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1508                                                         _conservative_max_heap_alignment);
1509 
1510   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1511   NOT_LP64(ShouldNotReachHere(); return 0);
1512 }
1513 
1514 bool Arguments::should_auto_select_low_pause_collector() {
1515   if (UseAutoGCSelectPolicy &&
1516       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1517       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1518     if (PrintGCDetails) {
1519       // Cannot use gclog_or_tty yet.
1520       tty->print_cr("Automatic selection of the low pause collector"
1521        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1522     }
1523     return true;
1524   }
1525   return false;
1526 }
1527 
1528 void Arguments::set_use_compressed_oops() {
1529 #ifndef ZERO
1530 #ifdef _LP64
1531   // MaxHeapSize is not set up properly at this point, but
1532   // the only value that can override MaxHeapSize if we are
1533   // to use UseCompressedOops is InitialHeapSize.
1534   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1535 
1536   if (max_heap_size <= max_heap_for_compressed_oops()) {
1537 #if !defined(COMPILER1) || defined(TIERED)
1538     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1539       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1540     }
1541 #endif
1542   } else {
1543     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1544       warning("Max heap size too large for Compressed Oops");
1545       FLAG_SET_DEFAULT(UseCompressedOops, false);
1546       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1547     }
1548   }
1549 #endif // _LP64
1550 #endif // ZERO
1551 }
1552 
1553 
1554 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1555 // set_use_compressed_oops().
1556 void Arguments::set_use_compressed_klass_ptrs() {
1557 #ifndef ZERO
1558 #ifdef _LP64
1559   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1560   if (!UseCompressedOops) {
1561     if (UseCompressedClassPointers) {
1562       warning("UseCompressedClassPointers requires UseCompressedOops");
1563     }
1564     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1565   } else {
1566     // Turn on UseCompressedClassPointers too
1567     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1568       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1569     }
1570     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1571     if (UseCompressedClassPointers) {
1572       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1573         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1574         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1575       }
1576     }
1577   }
1578 #endif // _LP64
1579 #endif // !ZERO
1580 }
1581 
1582 void Arguments::set_conservative_max_heap_alignment() {
1583   // The conservative maximum required alignment for the heap is the maximum of
1584   // the alignments imposed by several sources: any requirements from the heap
1585   // itself, the collector policy and the maximum page size we may run the VM
1586   // with.
1587   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1588 #if INCLUDE_ALL_GCS
1589   if (UseParallelGC) {
1590     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1591   } else if (UseG1GC) {
1592     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1593   }
1594 #endif // INCLUDE_ALL_GCS
1595   _conservative_max_heap_alignment = MAX4(heap_alignment,
1596                                           (size_t)os::vm_allocation_granularity(),
1597                                           os::max_page_size(),
1598                                           CollectorPolicy::compute_heap_alignment());
1599 }
1600 
1601 void Arguments::select_gc_ergonomically() {
1602   if (os::is_server_class_machine()) {
1603     if (should_auto_select_low_pause_collector()) {
1604       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1605     } else {
1606       FLAG_SET_ERGO(bool, UseParallelGC, true);
1607     }
1608   }
1609 }
1610 
1611 void Arguments::select_gc() {
1612   if (!gc_selected()) {
1613     ArgumentsExt::select_gc_ergonomically();
1614   }
1615 }
1616 
1617 void Arguments::set_ergonomics_flags() {
1618   select_gc();
1619 
1620 #ifdef COMPILER2
1621   // Shared spaces work fine with other GCs but causes bytecode rewriting
1622   // to be disabled, which hurts interpreter performance and decreases
1623   // server performance.  When -server is specified, keep the default off
1624   // unless it is asked for.  Future work: either add bytecode rewriting
1625   // at link time, or rewrite bytecodes in non-shared methods.
1626   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1627       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1628     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1629   }
1630 #endif
1631 
1632   set_conservative_max_heap_alignment();
1633 
1634 #ifndef ZERO
1635 #ifdef _LP64
1636   set_use_compressed_oops();
1637 
1638   // set_use_compressed_klass_ptrs() must be called after calling
1639   // set_use_compressed_oops().
1640   set_use_compressed_klass_ptrs();
1641 
1642   // Also checks that certain machines are slower with compressed oops
1643   // in vm_version initialization code.
1644 #endif // _LP64
1645 #endif // !ZERO
1646 }
1647 
1648 void Arguments::set_parallel_gc_flags() {
1649   assert(UseParallelGC || UseParallelOldGC, "Error");
1650   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1651   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1652     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1653   }
1654   FLAG_SET_DEFAULT(UseParallelGC, true);
1655 
1656   // If no heap maximum was requested explicitly, use some reasonable fraction
1657   // of the physical memory, up to a maximum of 1GB.
1658   FLAG_SET_DEFAULT(ParallelGCThreads,
1659                    Abstract_VM_Version::parallel_worker_threads());
1660   if (ParallelGCThreads == 0) {
1661     jio_fprintf(defaultStream::error_stream(),
1662         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1663     vm_exit(1);
1664   }
1665 
1666   if (UseAdaptiveSizePolicy) {
1667     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1668     // unless the user actually sets these flags.
1669     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1670       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1671       _min_heap_free_ratio = MinHeapFreeRatio;
1672     }
1673     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1674       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1675       _max_heap_free_ratio = MaxHeapFreeRatio;
1676     }
1677   }
1678 
1679   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1680   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1681   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1682   // See CR 6362902 for details.
1683   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1684     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1685        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1686     }
1687     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1688       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1689     }
1690   }
1691 
1692   if (UseParallelOldGC) {
1693     // Par compact uses lower default values since they are treated as
1694     // minimums.  These are different defaults because of the different
1695     // interpretation and are not ergonomically set.
1696     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1697       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1698     }
1699   }
1700 }
1701 
1702 void Arguments::set_g1_gc_flags() {
1703   assert(UseG1GC, "Error");
1704 #ifdef COMPILER1
1705   FastTLABRefill = false;
1706 #endif
1707   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1708   if (ParallelGCThreads == 0) {
1709     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1710     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1711   }
1712 
1713 #if INCLUDE_ALL_GCS
1714   if (G1ConcRefinementThreads == 0) {
1715     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1716   }
1717 #endif
1718 
1719   // MarkStackSize will be set (if it hasn't been set by the user)
1720   // when concurrent marking is initialized.
1721   // Its value will be based upon the number of parallel marking threads.
1722   // But we do set the maximum mark stack size here.
1723   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1724     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1725   }
1726 
1727   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1728     // In G1, we want the default GC overhead goal to be higher than
1729     // say in PS. So we set it here to 10%. Otherwise the heap might
1730     // be expanded more aggressively than we would like it to. In
1731     // fact, even 10% seems to not be high enough in some cases
1732     // (especially small GC stress tests that the main thing they do
1733     // is allocation). We might consider increase it further.
1734     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1735   }
1736 
1737   if (PrintGCDetails && Verbose) {
1738     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1739       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1740     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1741   }
1742 }
1743 
1744 #if !INCLUDE_ALL_GCS
1745 #ifdef ASSERT
1746 static bool verify_serial_gc_flags() {
1747   return (UseSerialGC &&
1748         !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1749           UseParallelGC || UseParallelOldGC));
1750 }
1751 #endif // ASSERT
1752 #endif // INCLUDE_ALL_GCS
1753 
1754 void Arguments::set_gc_specific_flags() {
1755 #if INCLUDE_ALL_GCS
1756   // Set per-collector flags
1757   if (UseParallelGC || UseParallelOldGC) {
1758     set_parallel_gc_flags();
1759   } else if (UseConcMarkSweepGC) {
1760     set_cms_and_parnew_gc_flags();
1761   } else if (UseG1GC) {
1762     set_g1_gc_flags();
1763   }
1764   check_deprecated_gc_flags();
1765   if (AssumeMP && !UseSerialGC) {
1766     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1767       warning("If the number of processors is expected to increase from one, then"
1768               " you should configure the number of parallel GC threads appropriately"
1769               " using -XX:ParallelGCThreads=N");
1770     }
1771   }
1772   if (MinHeapFreeRatio == 100) {
1773     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1774     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1775   }
1776 #else // INCLUDE_ALL_GCS
1777   assert(verify_serial_gc_flags(), "SerialGC unset");
1778 #endif // INCLUDE_ALL_GCS
1779 }
1780 
1781 julong Arguments::limit_by_allocatable_memory(julong limit) {
1782   julong max_allocatable;
1783   julong result = limit;
1784   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1785     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1786   }
1787   return result;
1788 }
1789 
1790 // Use static initialization to get the default before parsing
1791 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1792 
1793 void Arguments::set_heap_size() {
1794   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1795     // Deprecated flag
1796     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1797   }
1798 
1799   const julong phys_mem =
1800     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1801                             : (julong)MaxRAM;
1802 
1803   // If the maximum heap size has not been set with -Xmx,
1804   // then set it as fraction of the size of physical memory,
1805   // respecting the maximum and minimum sizes of the heap.
1806   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1807     julong reasonable_max = phys_mem / MaxRAMFraction;
1808 
1809     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1810       // Small physical memory, so use a minimum fraction of it for the heap
1811       reasonable_max = phys_mem / MinRAMFraction;
1812     } else {
1813       // Not-small physical memory, so require a heap at least
1814       // as large as MaxHeapSize
1815       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1816     }
1817     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1818       // Limit the heap size to ErgoHeapSizeLimit
1819       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1820     }
1821     if (UseCompressedOops) {
1822       // Limit the heap size to the maximum possible when using compressed oops
1823       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1824 
1825       // HeapBaseMinAddress can be greater than default but not less than.
1826       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1827         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1828           // matches compressed oops printing flags
1829           if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1830             jio_fprintf(defaultStream::error_stream(),
1831                         "HeapBaseMinAddress must be at least " UINTX_FORMAT
1832                         " (" UINTX_FORMAT "G) which is greater than value given "
1833                         UINTX_FORMAT "\n",
1834                         DefaultHeapBaseMinAddress,
1835                         DefaultHeapBaseMinAddress/G,
1836                         HeapBaseMinAddress);
1837           }
1838           FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1839         }
1840       }
1841 
1842       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1843         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1844         // but it should be not less than default MaxHeapSize.
1845         max_coop_heap -= HeapBaseMinAddress;
1846       }
1847       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1848     }
1849     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1850 
1851     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1852       // An initial heap size was specified on the command line,
1853       // so be sure that the maximum size is consistent.  Done
1854       // after call to limit_by_allocatable_memory because that
1855       // method might reduce the allocation size.
1856       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1857     }
1858 
1859     if (PrintGCDetails && Verbose) {
1860       // Cannot use gclog_or_tty yet.
1861       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1862     }
1863     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1864   }
1865 
1866   // If the minimum or initial heap_size have not been set or requested to be set
1867   // ergonomically, set them accordingly.
1868   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1869     julong reasonable_minimum = (julong)(OldSize + NewSize);
1870 
1871     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1872 
1873     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1874 
1875     if (InitialHeapSize == 0) {
1876       julong reasonable_initial = phys_mem / InitialRAMFraction;
1877 
1878       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1879       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1880 
1881       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1882 
1883       if (PrintGCDetails && Verbose) {
1884         // Cannot use gclog_or_tty yet.
1885         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1886       }
1887       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1888     }
1889     // If the minimum heap size has not been set (via -Xms),
1890     // synchronize with InitialHeapSize to avoid errors with the default value.
1891     if (min_heap_size() == 0) {
1892       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1893       if (PrintGCDetails && Verbose) {
1894         // Cannot use gclog_or_tty yet.
1895         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1896       }
1897     }
1898   }
1899 }
1900 
1901 // This must be called after ergonomics because we want bytecode rewriting
1902 // if the server compiler is used, or if UseSharedSpaces is disabled.
1903 void Arguments::set_bytecode_flags() {
1904   // Better not attempt to store into a read-only space.
1905   if (UseSharedSpaces) {
1906     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1907     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1908   }
1909 
1910   if (!RewriteBytecodes) {
1911     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1912   }
1913 }
1914 
1915 // Aggressive optimization flags  -XX:+AggressiveOpts
1916 void Arguments::set_aggressive_opts_flags() {
1917 #ifdef COMPILER2
1918   if (AggressiveUnboxing) {
1919     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1920       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1921     } else if (!EliminateAutoBox) {
1922       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1923       AggressiveUnboxing = false;
1924     }
1925     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1926       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1927     } else if (!DoEscapeAnalysis) {
1928       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1929       AggressiveUnboxing = false;
1930     }
1931   }
1932   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1933     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1934       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1935     }
1936     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1937       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1938     }
1939 
1940     // Feed the cache size setting into the JDK
1941     char buffer[1024];
1942     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1943     add_property(buffer);
1944   }
1945   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1946     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1947   }
1948 #endif
1949 
1950   if (AggressiveOpts) {
1951 // Sample flag setting code
1952 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1953 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1954 //    }
1955   }
1956 }
1957 
1958 //===========================================================================================================
1959 // Parsing of java.compiler property
1960 
1961 void Arguments::process_java_compiler_argument(char* arg) {
1962   // For backwards compatibility, Djava.compiler=NONE or ""
1963   // causes us to switch to -Xint mode UNLESS -Xdebug
1964   // is also specified.
1965   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1966     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1967   }
1968 }
1969 
1970 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1971   _sun_java_launcher = os::strdup_check_oom(launcher);
1972 }
1973 
1974 bool Arguments::created_by_java_launcher() {
1975   assert(_sun_java_launcher != NULL, "property must have value");
1976   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1977 }
1978 
1979 bool Arguments::sun_java_launcher_is_altjvm() {
1980   return _sun_java_launcher_is_altjvm;
1981 }
1982 
1983 //===========================================================================================================
1984 // Parsing of main arguments
1985 
1986 bool Arguments::verify_interval(uintx val, uintx min,
1987                                 uintx max, const char* name) {
1988   // Returns true iff value is in the inclusive interval [min..max]
1989   // false, otherwise.
1990   if (val >= min && val <= max) {
1991     return true;
1992   }
1993   jio_fprintf(defaultStream::error_stream(),
1994               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1995               " and " UINTX_FORMAT "\n",
1996               name, val, min, max);
1997   return false;
1998 }
1999 
2000 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2001   // Returns true if given value is at least specified min threshold
2002   // false, otherwise.
2003   if (val >= min ) {
2004       return true;
2005   }
2006   jio_fprintf(defaultStream::error_stream(),
2007               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2008               name, val, min);
2009   return false;
2010 }
2011 
2012 bool Arguments::verify_percentage(uintx value, const char* name) {
2013   if (is_percentage(value)) {
2014     return true;
2015   }
2016   jio_fprintf(defaultStream::error_stream(),
2017               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2018               name, value);
2019   return false;
2020 }
2021 
2022 // check if do gclog rotation
2023 // +UseGCLogFileRotation is a must,
2024 // no gc log rotation when log file not supplied or
2025 // NumberOfGCLogFiles is 0
2026 void check_gclog_consistency() {
2027   if (UseGCLogFileRotation) {
2028     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2029       jio_fprintf(defaultStream::output_stream(),
2030                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2031                   "where num_of_file > 0\n"
2032                   "GC log rotation is turned off\n");
2033       UseGCLogFileRotation = false;
2034     }
2035   }
2036 
2037   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2038     FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2039     jio_fprintf(defaultStream::output_stream(),
2040                 "GCLogFileSize changed to minimum 8K\n");
2041   }
2042 }
2043 
2044 // This function is called for -Xloggc:<filename>, it can be used
2045 // to check if a given file name(or string) conforms to the following
2046 // specification:
2047 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2048 // %p and %t only allowed once. We only limit usage of filename not path
2049 bool is_filename_valid(const char *file_name) {
2050   const char* p = file_name;
2051   char file_sep = os::file_separator()[0];
2052   const char* cp;
2053   // skip prefix path
2054   for (cp = file_name; *cp != '\0'; cp++) {
2055     if (*cp == '/' || *cp == file_sep) {
2056       p = cp + 1;
2057     }
2058   }
2059 
2060   int count_p = 0;
2061   int count_t = 0;
2062   while (*p != '\0') {
2063     if ((*p >= '0' && *p <= '9') ||
2064         (*p >= 'A' && *p <= 'Z') ||
2065         (*p >= 'a' && *p <= 'z') ||
2066          *p == '-'               ||
2067          *p == '_'               ||
2068          *p == '.') {
2069        p++;
2070        continue;
2071     }
2072     if (*p == '%') {
2073       if(*(p + 1) == 'p') {
2074         p += 2;
2075         count_p ++;
2076         continue;
2077       }
2078       if (*(p + 1) == 't') {
2079         p += 2;
2080         count_t ++;
2081         continue;
2082       }
2083     }
2084     return false;
2085   }
2086   return count_p < 2 && count_t < 2;
2087 }
2088 
2089 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2090   if (!is_percentage(min_heap_free_ratio)) {
2091     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2092     return false;
2093   }
2094   if (min_heap_free_ratio > MaxHeapFreeRatio) {
2095     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2096                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2097                   MaxHeapFreeRatio);
2098     return false;
2099   }
2100   // This does not set the flag itself, but stores the value in a safe place for later usage.
2101   _min_heap_free_ratio = min_heap_free_ratio;
2102   return true;
2103 }
2104 
2105 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2106   if (!is_percentage(max_heap_free_ratio)) {
2107     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2108     return false;
2109   }
2110   if (max_heap_free_ratio < MinHeapFreeRatio) {
2111     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2112                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2113                   MinHeapFreeRatio);
2114     return false;
2115   }
2116   // This does not set the flag itself, but stores the value in a safe place for later usage.
2117   _max_heap_free_ratio = max_heap_free_ratio;
2118   return true;
2119 }
2120 
2121 // Check consistency of GC selection
2122 bool Arguments::check_gc_consistency_user() {
2123   check_gclog_consistency();
2124   // Ensure that the user has not selected conflicting sets
2125   // of collectors.
2126   uint i = 0;
2127   if (UseSerialGC)                       i++;
2128   if (UseConcMarkSweepGC)                i++;
2129   if (UseParallelGC || UseParallelOldGC) i++;
2130   if (UseG1GC)                           i++;
2131   if (i > 1) {
2132     jio_fprintf(defaultStream::error_stream(),
2133                 "Conflicting collector combinations in option list; "
2134                 "please refer to the release notes for the combinations "
2135                 "allowed\n");
2136     return false;
2137   }
2138 
2139   if (UseConcMarkSweepGC && !UseParNewGC) {
2140     jio_fprintf(defaultStream::error_stream(),
2141         "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2142     return false;
2143   }
2144 
2145   if (UseParNewGC && !UseConcMarkSweepGC) {
2146     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2147     // set up UseSerialGC properly, so that can't be used in the check here.
2148     jio_fprintf(defaultStream::error_stream(),
2149         "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2150     return false;
2151   }
2152 
2153   return true;
2154 }
2155 
2156 void Arguments::check_deprecated_gc_flags() {
2157   if (FLAG_IS_CMDLINE(UseParNewGC)) {
2158     warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2159   }
2160   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2161     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2162             "and will likely be removed in future release");
2163   }
2164   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2165     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2166         "Use MaxRAMFraction instead.");
2167   }
2168 }
2169 
2170 // Check stack pages settings
2171 bool Arguments::check_stack_pages()
2172 {
2173   bool status = true;
2174   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2175   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2176   // greater stack shadow pages can't generate instruction to bang stack
2177   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2178   return status;
2179 }
2180 
2181 // Check the consistency of vm_init_args
2182 bool Arguments::check_vm_args_consistency() {
2183   // Method for adding checks for flag consistency.
2184   // The intent is to warn the user of all possible conflicts,
2185   // before returning an error.
2186   // Note: Needs platform-dependent factoring.
2187   bool status = true;
2188 
2189   if (TLABRefillWasteFraction == 0) {
2190     jio_fprintf(defaultStream::error_stream(),
2191                 "TLABRefillWasteFraction should be a denominator, "
2192                 "not " SIZE_FORMAT "\n",
2193                 TLABRefillWasteFraction);
2194     status = false;
2195   }
2196 
2197   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2198                               "AdaptiveSizePolicyWeight");
2199   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2200 
2201   // Divide by bucket size to prevent a large size from causing rollover when
2202   // calculating amount of memory needed to be allocated for the String table.
2203   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2204     (max_uintx / StringTable::bucket_size()), "StringTable size");
2205 
2206   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2207     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2208 
2209   {
2210     // Using "else if" below to avoid printing two error messages if min > max.
2211     // This will also prevent us from reporting both min>100 and max>100 at the
2212     // same time, but that is less annoying than printing two identical errors IMHO.
2213     FormatBuffer<80> err_msg("%s","");
2214     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2215       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2216       status = false;
2217     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2218       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2219       status = false;
2220     }
2221   }
2222 
2223   // Min/MaxMetaspaceFreeRatio
2224   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2225   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2226 
2227   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2228     jio_fprintf(defaultStream::error_stream(),
2229                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2230                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2231                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2232                 MinMetaspaceFreeRatio,
2233                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2234                 MaxMetaspaceFreeRatio);
2235     status = false;
2236   }
2237 
2238   // Trying to keep 100% free is not practical
2239   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2240 
2241   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2242     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2243   }
2244 
2245   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2246     // Settings to encourage splitting.
2247     if (!FLAG_IS_CMDLINE(NewRatio)) {
2248       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2249     }
2250     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2251       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2252     }
2253   }
2254 
2255   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2256     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2257   }
2258 
2259   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2260   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2261   if (GCTimeLimit == 100) {
2262     // Turn off gc-overhead-limit-exceeded checks
2263     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2264   }
2265 
2266   status = status && check_gc_consistency_user();
2267   status = status && check_stack_pages();
2268 
2269   status = status && verify_percentage(CMSIncrementalSafetyFactor,
2270                                     "CMSIncrementalSafetyFactor");
2271 
2272   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2273   // insists that we hold the requisite locks so that the iteration is
2274   // MT-safe. For the verification at start-up and shut-down, we don't
2275   // yet have a good way of acquiring and releasing these locks,
2276   // which are not visible at the CollectedHeap level. We want to
2277   // be able to acquire these locks and then do the iteration rather
2278   // than just disable the lock verification. This will be fixed under
2279   // bug 4788986.
2280   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2281     if (VerifyDuringStartup) {
2282       warning("Heap verification at start-up disabled "
2283               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2284       VerifyDuringStartup = false; // Disable verification at start-up
2285     }
2286 
2287     if (VerifyBeforeExit) {
2288       warning("Heap verification at shutdown disabled "
2289               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2290       VerifyBeforeExit = false; // Disable verification at shutdown
2291     }
2292   }
2293 
2294   // Note: only executed in non-PRODUCT mode
2295   if (!UseAsyncConcMarkSweepGC &&
2296       (ExplicitGCInvokesConcurrent ||
2297        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2298     jio_fprintf(defaultStream::error_stream(),
2299                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2300                 " with -UseAsyncConcMarkSweepGC");
2301     status = false;
2302   }
2303 
2304   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2305 
2306 #if INCLUDE_ALL_GCS
2307   if (UseG1GC) {
2308     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2309     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2310     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2311 
2312     status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2313     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2314                                          "InitiatingHeapOccupancyPercent");
2315     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2316                                         "G1RefProcDrainInterval");
2317     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2318                                         "G1ConcMarkStepDurationMillis");
2319     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2320                                        "G1ConcRSHotCardLimit");
2321     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2322                                        "G1ConcRSLogCacheSize");
2323     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2324                                        "StringDeduplicationAgeThreshold");
2325   }
2326   if (UseConcMarkSweepGC) {
2327     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2328     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2329     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2330     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2331 
2332     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2333 
2334     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2335     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2336     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2337 
2338     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2339 
2340     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2341     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2342 
2343     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2344     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2345     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2346 
2347     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2348 
2349     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2350 
2351     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2352     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2353     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2354     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2355     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2356   }
2357 
2358   if (UseParallelGC || UseParallelOldGC) {
2359     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2360     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2361 
2362     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2363     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2364 
2365     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2366     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2367 
2368     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2369 
2370     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2371   }
2372 #endif // INCLUDE_ALL_GCS
2373 
2374   status = status && verify_interval(RefDiscoveryPolicy,
2375                                      ReferenceProcessor::DiscoveryPolicyMin,
2376                                      ReferenceProcessor::DiscoveryPolicyMax,
2377                                      "RefDiscoveryPolicy");
2378 
2379   // Limit the lower bound of this flag to 1 as it is used in a division
2380   // expression.
2381   status = status && verify_interval(TLABWasteTargetPercent,
2382                                      1, 100, "TLABWasteTargetPercent");
2383 
2384   status = status && verify_object_alignment();
2385 
2386   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2387                                       "CompressedClassSpaceSize");
2388 
2389   status = status && verify_interval(MarkStackSizeMax,
2390                                   1, (max_jint - 1), "MarkStackSizeMax");
2391   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2392 
2393   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2394 
2395   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2396 
2397   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2398 
2399   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2400   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2401 
2402   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2403 
2404   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2405   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2406   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2407   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2408 
2409   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2410   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2411 
2412   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2413   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2414   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2415 
2416   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2417   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2418 
2419   status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2420   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2421   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2422   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2423 
2424   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2425 #ifdef COMPILER1
2426   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2427 #endif
2428   status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2429 
2430   if (PrintNMTStatistics) {
2431 #if INCLUDE_NMT
2432     if (MemTracker::tracking_level() == NMT_off) {
2433 #endif // INCLUDE_NMT
2434       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2435       PrintNMTStatistics = false;
2436 #if INCLUDE_NMT
2437     }
2438 #endif
2439   }
2440 
2441   // Need to limit the extent of the padding to reasonable size.
2442   // 8K is well beyond the reasonable HW cache line size, even with the
2443   // aggressive prefetching, while still leaving the room for segregating
2444   // among the distinct pages.
2445   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2446     jio_fprintf(defaultStream::error_stream(),
2447                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2448                 ContendedPaddingWidth, 0, 8192);
2449     status = false;
2450   }
2451 
2452   // Need to enforce the padding not to break the existing field alignments.
2453   // It is sufficient to check against the largest type size.
2454   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2455     jio_fprintf(defaultStream::error_stream(),
2456                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2457                 ContendedPaddingWidth, BytesPerLong);
2458     status = false;
2459   }
2460 
2461   // Check lower bounds of the code cache
2462   // Template Interpreter code is approximately 3X larger in debug builds.
2463   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2464   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2465     jio_fprintf(defaultStream::error_stream(),
2466                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2467                 os::vm_page_size()/K);
2468     status = false;
2469   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2470     jio_fprintf(defaultStream::error_stream(),
2471                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2472                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2473     status = false;
2474   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2475     jio_fprintf(defaultStream::error_stream(),
2476                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2477                 min_code_cache_size/K);
2478     status = false;
2479   } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2480     // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2481     jio_fprintf(defaultStream::error_stream(),
2482                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2483                 CODE_CACHE_SIZE_LIMIT/M);
2484     status = false;
2485   } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2486     jio_fprintf(defaultStream::error_stream(),
2487                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2488                 min_code_cache_size/K);
2489     status = false;
2490   } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2491              && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2492     jio_fprintf(defaultStream::error_stream(),
2493                 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2494                 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2495                 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2496     status = false;
2497   }
2498 
2499   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2500   status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2501   status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2502   status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2503 
2504 
2505   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2506   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2507   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2508   // Check the minimum number of compiler threads
2509   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2510 
2511   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2512     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2513   }
2514 
2515   return status;
2516 }
2517 
2518 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2519   const char* option_type) {
2520   if (ignore) return false;
2521 
2522   const char* spacer = " ";
2523   if (option_type == NULL) {
2524     option_type = ++spacer; // Set both to the empty string.
2525   }
2526 
2527   if (os::obsolete_option(option)) {
2528     jio_fprintf(defaultStream::error_stream(),
2529                 "Obsolete %s%soption: %s\n", option_type, spacer,
2530       option->optionString);
2531     return false;
2532   } else {
2533     jio_fprintf(defaultStream::error_stream(),
2534                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2535       option->optionString);
2536     return true;
2537   }
2538 }
2539 
2540 static const char* user_assertion_options[] = {
2541   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2542 };
2543 
2544 static const char* system_assertion_options[] = {
2545   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2546 };
2547 
2548 bool Arguments::parse_uintx(const char* value,
2549                             uintx* uintx_arg,
2550                             uintx min_size) {
2551 
2552   // Check the sign first since atomull() parses only unsigned values.
2553   bool value_is_positive = !(*value == '-');
2554 
2555   if (value_is_positive) {
2556     julong n;
2557     bool good_return = atomull(value, &n);
2558     if (good_return) {
2559       bool above_minimum = n >= min_size;
2560       bool value_is_too_large = n > max_uintx;
2561 
2562       if (above_minimum && !value_is_too_large) {
2563         *uintx_arg = n;
2564         return true;
2565       }
2566     }
2567   }
2568   return false;
2569 }
2570 
2571 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2572                                                   julong* long_arg,
2573                                                   julong min_size) {
2574   if (!atomull(s, long_arg)) return arg_unreadable;
2575   return check_memory_size(*long_arg, min_size);
2576 }
2577 
2578 // Parse JavaVMInitArgs structure
2579 
2580 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2581   // For components of the system classpath.
2582   SysClassPath scp(Arguments::get_sysclasspath());
2583   bool scp_assembly_required = false;
2584 
2585   // Save default settings for some mode flags
2586   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2587   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2588   Arguments::_ClipInlining             = ClipInlining;
2589   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2590 
2591   // Setup flags for mixed which is the default
2592   set_mode_flags(_mixed);
2593 
2594   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2595   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2596   if (result != JNI_OK) {
2597     return result;
2598   }
2599 
2600   // Parse JavaVMInitArgs structure passed in
2601   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2602   if (result != JNI_OK) {
2603     return result;
2604   }
2605 
2606   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2607   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2608   if (result != JNI_OK) {
2609     return result;
2610   }
2611 
2612   // Do final processing now that all arguments have been parsed
2613   result = finalize_vm_init_args(&scp, scp_assembly_required);
2614   if (result != JNI_OK) {
2615     return result;
2616   }
2617 
2618   return JNI_OK;
2619 }
2620 
2621 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2622 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2623 // are dealing with -agentpath (case where name is a path), otherwise with
2624 // -agentlib
2625 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2626   char *_name;
2627   const char *_hprof = "hprof", *_jdwp = "jdwp";
2628   size_t _len_hprof, _len_jdwp, _len_prefix;
2629 
2630   if (is_path) {
2631     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2632       return false;
2633     }
2634 
2635     _name++;  // skip past last path separator
2636     _len_prefix = strlen(JNI_LIB_PREFIX);
2637 
2638     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2639       return false;
2640     }
2641 
2642     _name += _len_prefix;
2643     _len_hprof = strlen(_hprof);
2644     _len_jdwp = strlen(_jdwp);
2645 
2646     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2647       _name += _len_hprof;
2648     }
2649     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2650       _name += _len_jdwp;
2651     }
2652     else {
2653       return false;
2654     }
2655 
2656     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2657       return false;
2658     }
2659 
2660     return true;
2661   }
2662 
2663   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2664     return true;
2665   }
2666 
2667   return false;
2668 }
2669 
2670 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2671                                        SysClassPath* scp_p,
2672                                        bool* scp_assembly_required_p,
2673                                        Flag::Flags origin) {
2674   // Remaining part of option string
2675   const char* tail;
2676 
2677   // iterate over arguments
2678   for (int index = 0; index < args->nOptions; index++) {
2679     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2680 
2681     const JavaVMOption* option = args->options + index;
2682 
2683     if (!match_option(option, "-Djava.class.path", &tail) &&
2684         !match_option(option, "-Dsun.java.command", &tail) &&
2685         !match_option(option, "-Dsun.java.launcher", &tail)) {
2686 
2687         // add all jvm options to the jvm_args string. This string
2688         // is used later to set the java.vm.args PerfData string constant.
2689         // the -Djava.class.path and the -Dsun.java.command options are
2690         // omitted from jvm_args string as each have their own PerfData
2691         // string constant object.
2692         build_jvm_args(option->optionString);
2693     }
2694 
2695     // -verbose:[class/gc/jni]
2696     if (match_option(option, "-verbose", &tail)) {
2697       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2698         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2699         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2700       } else if (!strcmp(tail, ":gc")) {
2701         FLAG_SET_CMDLINE(bool, PrintGC, true);
2702       } else if (!strcmp(tail, ":jni")) {
2703         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2704       }
2705     // -da / -ea / -disableassertions / -enableassertions
2706     // These accept an optional class/package name separated by a colon, e.g.,
2707     // -da:java.lang.Thread.
2708     } else if (match_option(option, user_assertion_options, &tail, true)) {
2709       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2710       if (*tail == '\0') {
2711         JavaAssertions::setUserClassDefault(enable);
2712       } else {
2713         assert(*tail == ':', "bogus match by match_option()");
2714         JavaAssertions::addOption(tail + 1, enable);
2715       }
2716     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2717     } else if (match_option(option, system_assertion_options, &tail, false)) {
2718       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2719       JavaAssertions::setSystemClassDefault(enable);
2720     // -bootclasspath:
2721     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2722       scp_p->reset_path(tail);
2723       *scp_assembly_required_p = true;
2724     // -bootclasspath/a:
2725     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2726       scp_p->add_suffix(tail);
2727       *scp_assembly_required_p = true;
2728     // -bootclasspath/p:
2729     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2730       scp_p->add_prefix(tail);
2731       *scp_assembly_required_p = true;
2732     // -Xrun
2733     } else if (match_option(option, "-Xrun", &tail)) {
2734       if (tail != NULL) {
2735         const char* pos = strchr(tail, ':');
2736         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2737         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2738         name[len] = '\0';
2739 
2740         char *options = NULL;
2741         if(pos != NULL) {
2742           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2743           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2744         }
2745 #if !INCLUDE_JVMTI
2746         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2747           jio_fprintf(defaultStream::error_stream(),
2748             "Profiling and debugging agents are not supported in this VM\n");
2749           return JNI_ERR;
2750         }
2751 #endif // !INCLUDE_JVMTI
2752         add_init_library(name, options);
2753       }
2754     // -agentlib and -agentpath
2755     } else if (match_option(option, "-agentlib:", &tail) ||
2756           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2757       if(tail != NULL) {
2758         const char* pos = strchr(tail, '=');
2759         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2760         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2761         name[len] = '\0';
2762 
2763         char *options = NULL;
2764         if(pos != NULL) {
2765           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2766         }
2767 #if !INCLUDE_JVMTI
2768         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2769           jio_fprintf(defaultStream::error_stream(),
2770             "Profiling and debugging agents are not supported in this VM\n");
2771           return JNI_ERR;
2772         }
2773 #endif // !INCLUDE_JVMTI
2774         add_init_agent(name, options, is_absolute_path);
2775       }
2776     // -javaagent
2777     } else if (match_option(option, "-javaagent:", &tail)) {
2778 #if !INCLUDE_JVMTI
2779       jio_fprintf(defaultStream::error_stream(),
2780         "Instrumentation agents are not supported in this VM\n");
2781       return JNI_ERR;
2782 #else
2783       if(tail != NULL) {
2784         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2785         add_init_agent("instrument", options, false);
2786       }
2787 #endif // !INCLUDE_JVMTI
2788     // -Xnoclassgc
2789     } else if (match_option(option, "-Xnoclassgc")) {
2790       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2791     // -Xconcgc
2792     } else if (match_option(option, "-Xconcgc")) {
2793       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2794     // -Xnoconcgc
2795     } else if (match_option(option, "-Xnoconcgc")) {
2796       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2797     // -Xbatch
2798     } else if (match_option(option, "-Xbatch")) {
2799       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2800     // -Xmn for compatibility with other JVM vendors
2801     } else if (match_option(option, "-Xmn", &tail)) {
2802       julong long_initial_young_size = 0;
2803       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2804       if (errcode != arg_in_range) {
2805         jio_fprintf(defaultStream::error_stream(),
2806                     "Invalid initial young generation size: %s\n", option->optionString);
2807         describe_range_error(errcode);
2808         return JNI_EINVAL;
2809       }
2810       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2811       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2812     // -Xms
2813     } else if (match_option(option, "-Xms", &tail)) {
2814       julong long_initial_heap_size = 0;
2815       // an initial heap size of 0 means automatically determine
2816       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2817       if (errcode != arg_in_range) {
2818         jio_fprintf(defaultStream::error_stream(),
2819                     "Invalid initial heap size: %s\n", option->optionString);
2820         describe_range_error(errcode);
2821         return JNI_EINVAL;
2822       }
2823       set_min_heap_size((uintx)long_initial_heap_size);
2824       // Currently the minimum size and the initial heap sizes are the same.
2825       // Can be overridden with -XX:InitialHeapSize.
2826       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2827     // -Xmx
2828     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2829       julong long_max_heap_size = 0;
2830       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2831       if (errcode != arg_in_range) {
2832         jio_fprintf(defaultStream::error_stream(),
2833                     "Invalid maximum heap size: %s\n", option->optionString);
2834         describe_range_error(errcode);
2835         return JNI_EINVAL;
2836       }
2837       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2838     // Xmaxf
2839     } else if (match_option(option, "-Xmaxf", &tail)) {
2840       char* err;
2841       int maxf = (int)(strtod(tail, &err) * 100);
2842       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2843         jio_fprintf(defaultStream::error_stream(),
2844                     "Bad max heap free percentage size: %s\n",
2845                     option->optionString);
2846         return JNI_EINVAL;
2847       } else {
2848         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2849       }
2850     // Xminf
2851     } else if (match_option(option, "-Xminf", &tail)) {
2852       char* err;
2853       int minf = (int)(strtod(tail, &err) * 100);
2854       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2855         jio_fprintf(defaultStream::error_stream(),
2856                     "Bad min heap free percentage size: %s\n",
2857                     option->optionString);
2858         return JNI_EINVAL;
2859       } else {
2860         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2861       }
2862     // -Xss
2863     } else if (match_option(option, "-Xss", &tail)) {
2864       julong long_ThreadStackSize = 0;
2865       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2866       if (errcode != arg_in_range) {
2867         jio_fprintf(defaultStream::error_stream(),
2868                     "Invalid thread stack size: %s\n", option->optionString);
2869         describe_range_error(errcode);
2870         return JNI_EINVAL;
2871       }
2872       // Internally track ThreadStackSize in units of 1024 bytes.
2873       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2874                               round_to((int)long_ThreadStackSize, K) / K);
2875     // -Xoss
2876     } else if (match_option(option, "-Xoss", &tail)) {
2877           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2878     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2879       julong long_CodeCacheExpansionSize = 0;
2880       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2881       if (errcode != arg_in_range) {
2882         jio_fprintf(defaultStream::error_stream(),
2883                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2884                    os::vm_page_size()/K);
2885         return JNI_EINVAL;
2886       }
2887       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2888     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2889                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2890       julong long_ReservedCodeCacheSize = 0;
2891 
2892       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2893       if (errcode != arg_in_range) {
2894         jio_fprintf(defaultStream::error_stream(),
2895                     "Invalid maximum code cache size: %s.\n", option->optionString);
2896         return JNI_EINVAL;
2897       }
2898       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2899       // -XX:NonNMethodCodeHeapSize=
2900     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2901       julong long_NonNMethodCodeHeapSize = 0;
2902 
2903       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2904       if (errcode != arg_in_range) {
2905         jio_fprintf(defaultStream::error_stream(),
2906                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2907         return JNI_EINVAL;
2908       }
2909       FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2910       // -XX:ProfiledCodeHeapSize=
2911     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2912       julong long_ProfiledCodeHeapSize = 0;
2913 
2914       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2915       if (errcode != arg_in_range) {
2916         jio_fprintf(defaultStream::error_stream(),
2917                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2918         return JNI_EINVAL;
2919       }
2920       FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2921       // -XX:NonProfiledCodeHeapSizee=
2922     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2923       julong long_NonProfiledCodeHeapSize = 0;
2924 
2925       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2926       if (errcode != arg_in_range) {
2927         jio_fprintf(defaultStream::error_stream(),
2928                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2929         return JNI_EINVAL;
2930       }
2931       FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2932       //-XX:IncreaseFirstTierCompileThresholdAt=
2933     } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2934         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2935         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2936           jio_fprintf(defaultStream::error_stream(),
2937                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2938                       option->optionString);
2939           return JNI_EINVAL;
2940         }
2941         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2942     // -green
2943     } else if (match_option(option, "-green")) {
2944       jio_fprintf(defaultStream::error_stream(),
2945                   "Green threads support not available\n");
2946           return JNI_EINVAL;
2947     // -native
2948     } else if (match_option(option, "-native")) {
2949           // HotSpot always uses native threads, ignore silently for compatibility
2950     // -Xsqnopause
2951     } else if (match_option(option, "-Xsqnopause")) {
2952           // EVM option, ignore silently for compatibility
2953     // -Xrs
2954     } else if (match_option(option, "-Xrs")) {
2955           // Classic/EVM option, new functionality
2956       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2957     } else if (match_option(option, "-Xusealtsigs")) {
2958           // change default internal VM signals used - lower case for back compat
2959       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2960     // -Xoptimize
2961     } else if (match_option(option, "-Xoptimize")) {
2962           // EVM option, ignore silently for compatibility
2963     // -Xprof
2964     } else if (match_option(option, "-Xprof")) {
2965 #if INCLUDE_FPROF
2966       _has_profile = true;
2967 #else // INCLUDE_FPROF
2968       jio_fprintf(defaultStream::error_stream(),
2969         "Flat profiling is not supported in this VM.\n");
2970       return JNI_ERR;
2971 #endif // INCLUDE_FPROF
2972     // -Xconcurrentio
2973     } else if (match_option(option, "-Xconcurrentio")) {
2974       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2975       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2976       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2977       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2978       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2979 
2980       // -Xinternalversion
2981     } else if (match_option(option, "-Xinternalversion")) {
2982       jio_fprintf(defaultStream::output_stream(), "%s\n",
2983                   VM_Version::internal_vm_info_string());
2984       vm_exit(0);
2985 #ifndef PRODUCT
2986     // -Xprintflags
2987     } else if (match_option(option, "-Xprintflags")) {
2988       CommandLineFlags::printFlags(tty, false);
2989       vm_exit(0);
2990 #endif
2991     // -D
2992     } else if (match_option(option, "-D", &tail)) {
2993       const char* value;
2994       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2995             *value!= '\0' && strcmp(value, "\"\"") != 0) {
2996         // abort if -Djava.endorsed.dirs is set
2997         jio_fprintf(defaultStream::output_stream(),
2998           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2999           "in modular form will be supported via the concept of upgradeable modules.\n", value);
3000         return JNI_EINVAL;
3001       }
3002       if (match_option(option, "-Djava.ext.dirs=", &value) &&
3003             *value != '\0' && strcmp(value, "\"\"") != 0) {
3004         // abort if -Djava.ext.dirs is set
3005         jio_fprintf(defaultStream::output_stream(),
3006           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
3007         return JNI_EINVAL;
3008       }
3009 
3010       if (!add_property(tail)) {
3011         return JNI_ENOMEM;
3012       }
3013       // Out of the box management support
3014       if (match_option(option, "-Dcom.sun.management", &tail)) {
3015 #if INCLUDE_MANAGEMENT
3016         FLAG_SET_CMDLINE(bool, ManagementServer, true);
3017 #else
3018         jio_fprintf(defaultStream::output_stream(),
3019           "-Dcom.sun.management is not supported in this VM.\n");
3020         return JNI_ERR;
3021 #endif
3022       }
3023     // -Xint
3024     } else if (match_option(option, "-Xint")) {
3025           set_mode_flags(_int);
3026     // -Xmixed
3027     } else if (match_option(option, "-Xmixed")) {
3028           set_mode_flags(_mixed);
3029     // -Xcomp
3030     } else if (match_option(option, "-Xcomp")) {
3031       // for testing the compiler; turn off all flags that inhibit compilation
3032           set_mode_flags(_comp);
3033     // -Xshare:dump
3034     } else if (match_option(option, "-Xshare:dump")) {
3035       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3036       set_mode_flags(_int);     // Prevent compilation, which creates objects
3037     // -Xshare:on
3038     } else if (match_option(option, "-Xshare:on")) {
3039       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3040       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3041     // -Xshare:auto
3042     } else if (match_option(option, "-Xshare:auto")) {
3043       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3044       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3045     // -Xshare:off
3046     } else if (match_option(option, "-Xshare:off")) {
3047       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3048       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3049     // -Xverify
3050     } else if (match_option(option, "-Xverify", &tail)) {
3051       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3052         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3053         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3054       } else if (strcmp(tail, ":remote") == 0) {
3055         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3056         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3057       } else if (strcmp(tail, ":none") == 0) {
3058         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3059         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3060       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3061         return JNI_EINVAL;
3062       }
3063     // -Xdebug
3064     } else if (match_option(option, "-Xdebug")) {
3065       // note this flag has been used, then ignore
3066       set_xdebug_mode(true);
3067     // -Xnoagent
3068     } else if (match_option(option, "-Xnoagent")) {
3069       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3070     } else if (match_option(option, "-Xboundthreads")) {
3071       // Bind user level threads to kernel threads (Solaris only)
3072       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3073     } else if (match_option(option, "-Xloggc:", &tail)) {
3074       // Redirect GC output to the file. -Xloggc:<filename>
3075       // ostream_init_log(), when called will use this filename
3076       // to initialize a fileStream.
3077       _gc_log_filename = os::strdup_check_oom(tail);
3078      if (!is_filename_valid(_gc_log_filename)) {
3079        jio_fprintf(defaultStream::output_stream(),
3080                   "Invalid file name for use with -Xloggc: Filename can only contain the "
3081                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3082                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
3083         return JNI_EINVAL;
3084       }
3085       FLAG_SET_CMDLINE(bool, PrintGC, true);
3086       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3087 
3088     // JNI hooks
3089     } else if (match_option(option, "-Xcheck", &tail)) {
3090       if (!strcmp(tail, ":jni")) {
3091 #if !INCLUDE_JNI_CHECK
3092         warning("JNI CHECKING is not supported in this VM");
3093 #else
3094         CheckJNICalls = true;
3095 #endif // INCLUDE_JNI_CHECK
3096       } else if (is_bad_option(option, args->ignoreUnrecognized,
3097                                      "check")) {
3098         return JNI_EINVAL;
3099       }
3100     } else if (match_option(option, "vfprintf")) {
3101       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3102     } else if (match_option(option, "exit")) {
3103       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3104     } else if (match_option(option, "abort")) {
3105       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3106     // -XX:+AggressiveHeap
3107     } else if (match_option(option, "-XX:+AggressiveHeap")) {
3108 
3109       // This option inspects the machine and attempts to set various
3110       // parameters to be optimal for long-running, memory allocation
3111       // intensive jobs.  It is intended for machines with large
3112       // amounts of cpu and memory.
3113 
3114       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3115       // VM, but we may not be able to represent the total physical memory
3116       // available (like having 8gb of memory on a box but using a 32bit VM).
3117       // Thus, we need to make sure we're using a julong for intermediate
3118       // calculations.
3119       julong initHeapSize;
3120       julong total_memory = os::physical_memory();
3121 
3122       if (total_memory < (julong)256*M) {
3123         jio_fprintf(defaultStream::error_stream(),
3124                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3125         vm_exit(1);
3126       }
3127 
3128       // The heap size is half of available memory, or (at most)
3129       // all of possible memory less 160mb (leaving room for the OS
3130       // when using ISM).  This is the maximum; because adaptive sizing
3131       // is turned on below, the actual space used may be smaller.
3132 
3133       initHeapSize = MIN2(total_memory / (julong)2,
3134                           total_memory - (julong)160*M);
3135 
3136       initHeapSize = limit_by_allocatable_memory(initHeapSize);
3137 
3138       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3139          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3140          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3141          // Currently the minimum size and the initial heap sizes are the same.
3142          set_min_heap_size(initHeapSize);
3143       }
3144       if (FLAG_IS_DEFAULT(NewSize)) {
3145          // Make the young generation 3/8ths of the total heap.
3146          FLAG_SET_CMDLINE(uintx, NewSize,
3147                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3148          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3149       }
3150 
3151 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3152       FLAG_SET_DEFAULT(UseLargePages, true);
3153 #endif
3154 
3155       // Increase some data structure sizes for efficiency
3156       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3157       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3158       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3159 
3160       // See the OldPLABSize comment below, but replace 'after promotion'
3161       // with 'after copying'.  YoungPLABSize is the size of the survivor
3162       // space per-gc-thread buffers.  The default is 4kw.
3163       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
3164 
3165       // OldPLABSize is the size of the buffers in the old gen that
3166       // UseParallelGC uses to promote live data that doesn't fit in the
3167       // survivor spaces.  At any given time, there's one for each gc thread.
3168       // The default size is 1kw. These buffers are rarely used, since the
3169       // survivor spaces are usually big enough.  For specjbb, however, there
3170       // are occasions when there's lots of live data in the young gen
3171       // and we end up promoting some of it.  We don't have a definite
3172       // explanation for why bumping OldPLABSize helps, but the theory
3173       // is that a bigger PLAB results in retaining something like the
3174       // original allocation order after promotion, which improves mutator
3175       // locality.  A minor effect may be that larger PLABs reduce the
3176       // number of PLAB allocation events during gc.  The value of 8kw
3177       // was arrived at by experimenting with specjbb.
3178       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
3179 
3180       // Enable parallel GC and adaptive generation sizing
3181       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3182       FLAG_SET_DEFAULT(ParallelGCThreads,
3183                        Abstract_VM_Version::parallel_worker_threads());
3184 
3185       // Encourage steady state memory management
3186       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3187 
3188       // This appears to improve mutator locality
3189       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3190 
3191       // Get around early Solaris scheduling bug
3192       // (affinity vs other jobs on system)
3193       // but disallow DR and offlining (5008695).
3194       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3195 
3196     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3197     // and the last option wins.
3198     } else if (match_option(option, "-XX:+NeverTenure")) {
3199       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3200       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3201       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3202     } else if (match_option(option, "-XX:+AlwaysTenure")) {
3203       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3204       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3205       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3206     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3207       uintx max_tenuring_thresh = 0;
3208       if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3209         jio_fprintf(defaultStream::error_stream(),
3210                     "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3211       }
3212       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3213 
3214       if (MaxTenuringThreshold == 0) {
3215         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3216         FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3217       } else {
3218         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3219         FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3220       }
3221     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3222       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3223       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3224     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3225       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3226       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3227     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3228 #if defined(DTRACE_ENABLED)
3229       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3230       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3231       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3232       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3233 #else // defined(DTRACE_ENABLED)
3234       jio_fprintf(defaultStream::error_stream(),
3235                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3236       return JNI_EINVAL;
3237 #endif // defined(DTRACE_ENABLED)
3238 #ifdef ASSERT
3239     } else if (match_option(option, "-XX:+FullGCALot")) {
3240       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3241       // disable scavenge before parallel mark-compact
3242       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3243 #endif
3244     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3245                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3246       julong stack_size = 0;
3247       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3248       if (errcode != arg_in_range) {
3249         jio_fprintf(defaultStream::error_stream(),
3250                     "Invalid mark stack size: %s\n", option->optionString);
3251         describe_range_error(errcode);
3252         return JNI_EINVAL;
3253       }
3254       jio_fprintf(defaultStream::error_stream(),
3255         "Please use -XX:MarkStackSize in place of "
3256         "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3257       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3258     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3259       julong max_stack_size = 0;
3260       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3261       if (errcode != arg_in_range) {
3262         jio_fprintf(defaultStream::error_stream(),
3263                     "Invalid maximum mark stack size: %s\n",
3264                     option->optionString);
3265         describe_range_error(errcode);
3266         return JNI_EINVAL;
3267       }
3268       jio_fprintf(defaultStream::error_stream(),
3269          "Please use -XX:MarkStackSizeMax in place of "
3270          "-XX:CMSMarkStackSizeMax in the future\n");
3271       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3272     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3273                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3274       uintx conc_threads = 0;
3275       if (!parse_uintx(tail, &conc_threads, 1)) {
3276         jio_fprintf(defaultStream::error_stream(),
3277                     "Invalid concurrent threads: %s\n", option->optionString);
3278         return JNI_EINVAL;
3279       }
3280       jio_fprintf(defaultStream::error_stream(),
3281         "Please use -XX:ConcGCThreads in place of "
3282         "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3283       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3284     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3285       julong max_direct_memory_size = 0;
3286       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3287       if (errcode != arg_in_range) {
3288         jio_fprintf(defaultStream::error_stream(),
3289                     "Invalid maximum direct memory size: %s\n",
3290                     option->optionString);
3291         describe_range_error(errcode);
3292         return JNI_EINVAL;
3293       }
3294       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3295 #if !INCLUDE_MANAGEMENT
3296     } else if (match_option(option, "-XX:+ManagementServer")) {
3297         jio_fprintf(defaultStream::error_stream(),
3298           "ManagementServer is not supported in this VM.\n");
3299         return JNI_ERR;
3300 #endif // INCLUDE_MANAGEMENT
3301     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3302       // Skip -XX:Flags= since that case has already been handled
3303       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3304         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3305           return JNI_EINVAL;
3306         }
3307       }
3308     // Unknown option
3309     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3310       return JNI_ERR;
3311     }
3312   }
3313 
3314   // PrintSharedArchiveAndExit will turn on
3315   //   -Xshare:on
3316   //   -XX:+TraceClassPaths
3317   if (PrintSharedArchiveAndExit) {
3318     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3319     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3320     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3321   }
3322 
3323   // Change the default value for flags  which have different default values
3324   // when working with older JDKs.
3325 #ifdef LINUX
3326  if (JDK_Version::current().compare_major(6) <= 0 &&
3327       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3328     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3329   }
3330 #endif // LINUX
3331   fix_appclasspath();
3332   return JNI_OK;
3333 }
3334 
3335 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3336 //
3337 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3338 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3339 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3340 // path is treated as the current directory.
3341 //
3342 // This causes problems with CDS, which requires that all directories specified in the classpath
3343 // must be empty. In most cases, applications do NOT want to load classes from the current
3344 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3345 // scripts compatible with CDS.
3346 void Arguments::fix_appclasspath() {
3347   if (IgnoreEmptyClassPaths) {
3348     const char separator = *os::path_separator();
3349     const char* src = _java_class_path->value();
3350 
3351     // skip over all the leading empty paths
3352     while (*src == separator) {
3353       src ++;
3354     }
3355 
3356     char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3357     strncpy(copy, src, strlen(src) + 1);
3358 
3359     // trim all trailing empty paths
3360     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3361       *tail = '\0';
3362     }
3363 
3364     char from[3] = {separator, separator, '\0'};
3365     char to  [2] = {separator, '\0'};
3366     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3367       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3368       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3369     }
3370 
3371     _java_class_path->set_value(copy);
3372     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3373   }
3374 
3375   if (!PrintSharedArchiveAndExit) {
3376     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3377   }
3378 }
3379 
3380 static bool has_jar_files(const char* directory) {
3381   DIR* dir = os::opendir(directory);
3382   if (dir == NULL) return false;
3383 
3384   struct dirent *entry;
3385   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3386   bool hasJarFile = false;
3387   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3388     const char* name = entry->d_name;
3389     const char* ext = name + strlen(name) - 4;
3390     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3391   }
3392   FREE_C_HEAP_ARRAY(char, dbuf);
3393   os::closedir(dir);
3394   return hasJarFile ;
3395 }
3396 
3397 static int check_non_empty_dirs(const char* path) {
3398   const char separator = *os::path_separator();
3399   const char* const end = path + strlen(path);
3400   int nonEmptyDirs = 0;
3401   while (path < end) {
3402     const char* tmp_end = strchr(path, separator);
3403     if (tmp_end == NULL) {
3404       if (has_jar_files(path)) {
3405         nonEmptyDirs++;
3406         jio_fprintf(defaultStream::output_stream(),
3407           "Non-empty directory: %s\n", path);
3408       }
3409       path = end;
3410     } else {
3411       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3412       memcpy(dirpath, path, tmp_end - path);
3413       dirpath[tmp_end - path] = '\0';
3414       if (has_jar_files(dirpath)) {
3415         nonEmptyDirs++;
3416         jio_fprintf(defaultStream::output_stream(),
3417           "Non-empty directory: %s\n", dirpath);
3418       }
3419       FREE_C_HEAP_ARRAY(char, dirpath);
3420       path = tmp_end + 1;
3421     }
3422   }
3423   return nonEmptyDirs;
3424 }
3425 
3426 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3427   // check if the default lib/endorsed directory exists; if so, error
3428   char path[JVM_MAXPATHLEN];
3429   const char* fileSep = os::file_separator();
3430   sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3431 
3432   if (CheckEndorsedAndExtDirs) {
3433     int nonEmptyDirs = 0;
3434     // check endorsed directory
3435     nonEmptyDirs += check_non_empty_dirs(path);
3436     // check the extension directories
3437     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3438     if (nonEmptyDirs > 0) {
3439       return JNI_ERR;
3440     }
3441   }
3442 
3443   DIR* dir = os::opendir(path);
3444   if (dir != NULL) {
3445     jio_fprintf(defaultStream::output_stream(),
3446       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3447       "in modular form will be supported via the concept of upgradeable modules.\n");
3448     os::closedir(dir);
3449     return JNI_ERR;
3450   }
3451 
3452   sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3453   dir = os::opendir(path);
3454   if (dir != NULL) {
3455     jio_fprintf(defaultStream::output_stream(),
3456       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3457       "Use -classpath instead.\n.");
3458     os::closedir(dir);
3459     return JNI_ERR;
3460   }
3461 
3462   if (scp_assembly_required) {
3463     // Assemble the bootclasspath elements into the final path.
3464     Arguments::set_sysclasspath(scp_p->combined_path());
3465   }
3466 
3467   // This must be done after all arguments have been processed.
3468   // java_compiler() true means set to "NONE" or empty.
3469   if (java_compiler() && !xdebug_mode()) {
3470     // For backwards compatibility, we switch to interpreted mode if
3471     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3472     // not specified.
3473     set_mode_flags(_int);
3474   }
3475 
3476   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3477   // but like -Xint, leave compilation thresholds unaffected.
3478   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3479   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3480     set_mode_flags(_int);
3481   }
3482 
3483   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3484   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3485     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3486   }
3487 
3488 #ifndef COMPILER2
3489   // Don't degrade server performance for footprint
3490   if (FLAG_IS_DEFAULT(UseLargePages) &&
3491       MaxHeapSize < LargePageHeapSizeThreshold) {
3492     // No need for large granularity pages w/small heaps.
3493     // Note that large pages are enabled/disabled for both the
3494     // Java heap and the code cache.
3495     FLAG_SET_DEFAULT(UseLargePages, false);
3496   }
3497 
3498 #else
3499   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3500     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3501   }
3502 #endif
3503 
3504 #ifndef TIERED
3505   // Tiered compilation is undefined.
3506   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3507 #endif
3508 
3509   // If we are running in a headless jre, force java.awt.headless property
3510   // to be true unless the property has already been set.
3511   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3512   if (os::is_headless_jre()) {
3513     const char* headless = Arguments::get_property("java.awt.headless");
3514     if (headless == NULL) {
3515       const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3516       if (headless_env == NULL) {
3517         if (!add_property("java.awt.headless=true")) {
3518           return JNI_ENOMEM;
3519         }
3520       } else {
3521         char buffer[256];
3522         const char *key = "java.awt.headless=";
3523         strcpy(buffer, key);
3524         strncat(buffer, headless_env, 256 - strlen(key) - 1);
3525         if (!add_property(buffer)) {
3526           return JNI_ENOMEM;
3527         }
3528       }
3529     }
3530   }
3531 
3532   if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3533     // CMS can only be used with ParNew
3534     FLAG_SET_ERGO(bool, UseParNewGC, true);
3535   }
3536 
3537   if (!check_vm_args_consistency()) {
3538     return JNI_ERR;
3539   }
3540 
3541   return JNI_OK;
3542 }
3543 
3544 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3545   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3546                                             scp_assembly_required_p);
3547 }
3548 
3549 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3550   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3551                                             scp_assembly_required_p);
3552 }
3553 
3554 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3555   char *buffer = ::getenv(name);
3556 
3557   // Don't check this variable if user has special privileges
3558   // (e.g. unix su command).
3559   if (buffer == NULL || os::have_special_privileges()) {
3560     return JNI_OK;
3561   }
3562 
3563   if ((buffer = os::strdup(buffer)) == NULL) {
3564     return JNI_ENOMEM;
3565   }
3566   GrowableArray<JavaVMOption> options(2, true);    // Construct option array
3567   jio_fprintf(defaultStream::error_stream(),
3568               "Picked up %s: %s\n", name, buffer);
3569   char* rd = buffer;                        // pointer to the input string (rd)
3570   while (true) {                            // repeat for all options in the input string
3571     while (isspace(*rd)) rd++;              // skip whitespace
3572     if (*rd == 0) break;                    // we re done when the input string is read completely
3573 
3574     // The output, option string, overwrites the input string.
3575     // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3576     // input string (rd).
3577     char* wrt = rd;
3578 
3579     JavaVMOption option;
3580     option.optionString = wrt;
3581     options.append(option);                 // Fill in option
3582     while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3583       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3584         int quote = *rd;                    // matching quote to look for
3585         rd++;                               // don't copy open quote
3586         while (*rd != quote) {              // include everything (even spaces) up until quote
3587           if (*rd == 0) {                   // string termination means unmatched string
3588             jio_fprintf(defaultStream::error_stream(),
3589                         "Unmatched quote in %s\n", name);
3590             os::free(buffer);
3591             return JNI_ERR;
3592           }
3593           *wrt++ = *rd++;                   // copy to option string
3594         }
3595         rd++;                               // don't copy close quote
3596       } else {
3597         *wrt++ = *rd++;                     // copy to option string
3598       }
3599     }
3600     // Need to check if we're done before writing a NULL,
3601     // because the write could be to the byte that rd is pointing to.
3602     if (*rd++ == 0) {
3603       *wrt = 0;
3604       break;
3605     }
3606     *wrt = 0;                               // Zero terminate option
3607   }
3608   JavaVMOption* options_arr =
3609       NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options.length(), mtInternal);
3610   if (options_arr == NULL) {
3611     return JNI_ENOMEM;
3612   }
3613   for (int i = 0; i < options.length(); i++) {
3614     options_arr[i] = options.at(i);
3615   }
3616 
3617   // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3618   JavaVMInitArgs vm_args;
3619   vm_args.version = JNI_VERSION_1_2;
3620   vm_args.options = options_arr;
3621   vm_args.nOptions = options.length();
3622   vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3623 
3624   if (PrintVMOptions) {
3625     const char* tail;
3626     for (int i = 0; i < vm_args.nOptions; i++) {
3627       const JavaVMOption *option = vm_args.options + i;
3628       if (match_option(option, "-XX:", &tail)) {
3629         logOption(tail);
3630       }
3631     }
3632   }
3633 
3634   jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3635                                        Flag::ENVIRON_VAR);
3636   FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3637   os::free(buffer);
3638   return result;
3639 }
3640 
3641 void Arguments::set_shared_spaces_flags() {
3642   if (DumpSharedSpaces) {
3643     if (RequireSharedSpaces) {
3644       warning("cannot dump shared archive while using shared archive");
3645     }
3646     UseSharedSpaces = false;
3647 #ifdef _LP64
3648     if (!UseCompressedOops || !UseCompressedClassPointers) {
3649       vm_exit_during_initialization(
3650         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3651     }
3652   } else {
3653     if (!UseCompressedOops || !UseCompressedClassPointers) {
3654       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3655     }
3656 #endif
3657   }
3658 }
3659 
3660 #if !INCLUDE_ALL_GCS
3661 static void force_serial_gc() {
3662   FLAG_SET_DEFAULT(UseSerialGC, true);
3663   UNSUPPORTED_GC_OPTION(UseG1GC);
3664   UNSUPPORTED_GC_OPTION(UseParallelGC);
3665   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3666   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3667   UNSUPPORTED_GC_OPTION(UseParNewGC);
3668 }
3669 #endif // INCLUDE_ALL_GCS
3670 
3671 // Sharing support
3672 // Construct the path to the archive
3673 static char* get_shared_archive_path() {
3674   char *shared_archive_path;
3675   if (SharedArchiveFile == NULL) {
3676     char jvm_path[JVM_MAXPATHLEN];
3677     os::jvm_path(jvm_path, sizeof(jvm_path));
3678     char *end = strrchr(jvm_path, *os::file_separator());
3679     if (end != NULL) *end = '\0';
3680     size_t jvm_path_len = strlen(jvm_path);
3681     size_t file_sep_len = strlen(os::file_separator());
3682     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3683         file_sep_len + 20, mtInternal);
3684     if (shared_archive_path != NULL) {
3685       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3686       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3687       strncat(shared_archive_path, "classes.jsa", 11);
3688     }
3689   } else {
3690     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3691     if (shared_archive_path != NULL) {
3692       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3693     }
3694   }
3695   return shared_archive_path;
3696 }
3697 
3698 #ifndef PRODUCT
3699 // Determine whether LogVMOutput should be implicitly turned on.
3700 static bool use_vm_log() {
3701   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3702       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3703       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3704       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3705       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3706     return true;
3707   }
3708 
3709 #ifdef COMPILER1
3710   if (PrintC1Statistics) {
3711     return true;
3712   }
3713 #endif // COMPILER1
3714 
3715 #ifdef COMPILER2
3716   if (PrintOptoAssembly || PrintOptoStatistics) {
3717     return true;
3718   }
3719 #endif // COMPILER2
3720 
3721   return false;
3722 }
3723 #endif // PRODUCT
3724 
3725 // Parse entry point called from JNI_CreateJavaVM
3726 
3727 jint Arguments::parse(const JavaVMInitArgs* args) {
3728 
3729   // Remaining part of option string
3730   const char* tail;
3731 
3732   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3733   const char* hotspotrc = ".hotspotrc";
3734   bool settings_file_specified = false;
3735   bool needs_hotspotrc_warning = false;
3736 
3737   const char* flags_file;
3738   int index;
3739   for (index = 0; index < args->nOptions; index++) {
3740     const JavaVMOption *option = args->options + index;
3741     if (ArgumentsExt::process_options(option)) {
3742       continue;
3743     }
3744     if (match_option(option, "-XX:Flags=", &tail)) {
3745       flags_file = tail;
3746       settings_file_specified = true;
3747       continue;
3748     }
3749     if (match_option(option, "-XX:+PrintVMOptions")) {
3750       PrintVMOptions = true;
3751       continue;
3752     }
3753     if (match_option(option, "-XX:-PrintVMOptions")) {
3754       PrintVMOptions = false;
3755       continue;
3756     }
3757     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3758       IgnoreUnrecognizedVMOptions = true;
3759       continue;
3760     }
3761     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3762       IgnoreUnrecognizedVMOptions = false;
3763       continue;
3764     }
3765     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3766       CommandLineFlags::printFlags(tty, false);
3767       vm_exit(0);
3768     }
3769 #if INCLUDE_NMT
3770     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3771       // The launcher did not setup nmt environment variable properly.
3772       if (!MemTracker::check_launcher_nmt_support(tail)) {
3773         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3774       }
3775 
3776       // Verify if nmt option is valid.
3777       if (MemTracker::verify_nmt_option()) {
3778         // Late initialization, still in single-threaded mode.
3779         if (MemTracker::tracking_level() >= NMT_summary) {
3780           MemTracker::init();
3781         }
3782       } else {
3783         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3784       }
3785       continue;
3786     }
3787 #endif
3788 
3789 
3790 #ifndef PRODUCT
3791     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3792       CommandLineFlags::printFlags(tty, true);
3793       vm_exit(0);
3794     }
3795 #endif
3796   }
3797 
3798   if (IgnoreUnrecognizedVMOptions) {
3799     // uncast const to modify the flag args->ignoreUnrecognized
3800     *(jboolean*)(&args->ignoreUnrecognized) = true;
3801   }
3802 
3803   // Parse specified settings file
3804   if (settings_file_specified) {
3805     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3806       return JNI_EINVAL;
3807     }
3808   } else {
3809 #ifdef ASSERT
3810     // Parse default .hotspotrc settings file
3811     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3812       return JNI_EINVAL;
3813     }
3814 #else
3815     struct stat buf;
3816     if (os::stat(hotspotrc, &buf) == 0) {
3817       needs_hotspotrc_warning = true;
3818     }
3819 #endif
3820   }
3821 
3822   if (PrintVMOptions) {
3823     for (index = 0; index < args->nOptions; index++) {
3824       const JavaVMOption *option = args->options + index;
3825       if (match_option(option, "-XX:", &tail)) {
3826         logOption(tail);
3827       }
3828     }
3829   }
3830 
3831   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3832   jint result = parse_vm_init_args(args);
3833   if (result != JNI_OK) {
3834     return result;
3835   }
3836 
3837   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3838   SharedArchivePath = get_shared_archive_path();
3839   if (SharedArchivePath == NULL) {
3840     return JNI_ENOMEM;
3841   }
3842 
3843   // Set up VerifySharedSpaces
3844   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3845     VerifySharedSpaces = true;
3846   }
3847 
3848   // Delay warning until here so that we've had a chance to process
3849   // the -XX:-PrintWarnings flag
3850   if (needs_hotspotrc_warning) {
3851     warning("%s file is present but has been ignored.  "
3852             "Run with -XX:Flags=%s to load the file.",
3853             hotspotrc, hotspotrc);
3854   }
3855 
3856 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3857   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3858 #endif
3859 
3860   ArgumentsExt::report_unsupported_options();
3861 
3862 #ifndef PRODUCT
3863   if (TraceBytecodesAt != 0) {
3864     TraceBytecodes = true;
3865   }
3866   if (CountCompiledCalls) {
3867     if (UseCounterDecay) {
3868       warning("UseCounterDecay disabled because CountCalls is set");
3869       UseCounterDecay = false;
3870     }
3871   }
3872 #endif // PRODUCT
3873 
3874   if (ScavengeRootsInCode == 0) {
3875     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3876       warning("forcing ScavengeRootsInCode non-zero");
3877     }
3878     ScavengeRootsInCode = 1;
3879   }
3880 
3881   if (PrintGCDetails) {
3882     // Turn on -verbose:gc options as well
3883     PrintGC = true;
3884   }
3885 
3886   // Set object alignment values.
3887   set_object_alignment();
3888 
3889 #if !INCLUDE_ALL_GCS
3890   force_serial_gc();
3891 #endif // INCLUDE_ALL_GCS
3892 #if !INCLUDE_CDS
3893   if (DumpSharedSpaces || RequireSharedSpaces) {
3894     jio_fprintf(defaultStream::error_stream(),
3895       "Shared spaces are not supported in this VM\n");
3896     return JNI_ERR;
3897   }
3898   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3899     warning("Shared spaces are not supported in this VM");
3900     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3901     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3902   }
3903   no_shared_spaces("CDS Disabled");
3904 #endif // INCLUDE_CDS
3905 
3906   return JNI_OK;
3907 }
3908 
3909 jint Arguments::apply_ergo() {
3910 
3911   // Set flags based on ergonomics.
3912   set_ergonomics_flags();
3913 
3914   set_shared_spaces_flags();
3915 
3916   // Check the GC selections again.
3917   if (!ArgumentsExt::check_gc_consistency_ergo()) {
3918     return JNI_EINVAL;
3919   }
3920 
3921   if (TieredCompilation) {
3922     set_tiered_flags();
3923   } else {
3924     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3925     if (CompilationPolicyChoice >= 2) {
3926       vm_exit_during_initialization(
3927         "Incompatible compilation policy selected", NULL);
3928     }
3929     // Scale CompileThreshold
3930     // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3931     if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3932       FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3933     }
3934   }
3935 
3936 #ifdef COMPILER2
3937 #ifndef PRODUCT
3938   if (PrintIdealGraphLevel > 0) {
3939     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3940   }
3941 #endif
3942 #endif
3943 
3944   // Set heap size based on available physical memory
3945   set_heap_size();
3946 
3947   ArgumentsExt::set_gc_specific_flags();
3948 
3949   // Initialize Metaspace flags and alignments
3950   Metaspace::ergo_initialize();
3951 
3952   // Set bytecode rewriting flags
3953   set_bytecode_flags();
3954 
3955   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3956   set_aggressive_opts_flags();
3957 
3958   // Turn off biased locking for locking debug mode flags,
3959   // which are subtly different from each other but neither works with
3960   // biased locking
3961   if (UseHeavyMonitors
3962 #ifdef COMPILER1
3963       || !UseFastLocking
3964 #endif // COMPILER1
3965     ) {
3966     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3967       // flag set to true on command line; warn the user that they
3968       // can't enable biased locking here
3969       warning("Biased Locking is not supported with locking debug flags"
3970               "; ignoring UseBiasedLocking flag." );
3971     }
3972     UseBiasedLocking = false;
3973   }
3974 
3975 #ifdef ZERO
3976   // Clear flags not supported on zero.
3977   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3978   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3979   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3980   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3981 #endif // CC_INTERP
3982 
3983 #ifdef COMPILER2
3984   if (!EliminateLocks) {
3985     EliminateNestedLocks = false;
3986   }
3987   if (!Inline) {
3988     IncrementalInline = false;
3989   }
3990 #ifndef PRODUCT
3991   if (!IncrementalInline) {
3992     AlwaysIncrementalInline = false;
3993   }
3994 #endif
3995   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3996     // nothing to use the profiling, turn if off
3997     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3998   }
3999 #endif
4000 
4001   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4002     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4003     DebugNonSafepoints = true;
4004   }
4005 
4006   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4007     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4008   }
4009 
4010 #ifndef PRODUCT
4011   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4012     if (use_vm_log()) {
4013       LogVMOutput = true;
4014     }
4015   }
4016 #endif // PRODUCT
4017 
4018   if (PrintCommandLineFlags) {
4019     CommandLineFlags::printSetFlags(tty);
4020   }
4021 
4022   // Apply CPU specific policy for the BiasedLocking
4023   if (UseBiasedLocking) {
4024     if (!VM_Version::use_biased_locking() &&
4025         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4026       UseBiasedLocking = false;
4027     }
4028   }
4029 #ifdef COMPILER2
4030   if (!UseBiasedLocking || EmitSync != 0) {
4031     UseOptoBiasInlining = false;
4032   }
4033 #endif
4034 
4035   return JNI_OK;
4036 }
4037 
4038 jint Arguments::adjust_after_os() {
4039   if (UseNUMA) {
4040     if (UseParallelGC || UseParallelOldGC) {
4041       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4042          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4043       }
4044     }
4045     // UseNUMAInterleaving is set to ON for all collectors and
4046     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4047     // such as the parallel collector for Linux and Solaris will
4048     // interleave old gen and survivor spaces on top of NUMA
4049     // allocation policy for the eden space.
4050     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4051     // all platforms and ParallelGC on Windows will interleave all
4052     // of the heap spaces across NUMA nodes.
4053     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4054       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4055     }
4056   }
4057   return JNI_OK;
4058 }
4059 
4060 int Arguments::PropertyList_count(SystemProperty* pl) {
4061   int count = 0;
4062   while(pl != NULL) {
4063     count++;
4064     pl = pl->next();
4065   }
4066   return count;
4067 }
4068 
4069 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4070   assert(key != NULL, "just checking");
4071   SystemProperty* prop;
4072   for (prop = pl; prop != NULL; prop = prop->next()) {
4073     if (strcmp(key, prop->key()) == 0) return prop->value();
4074   }
4075   return NULL;
4076 }
4077 
4078 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4079   int count = 0;
4080   const char* ret_val = NULL;
4081 
4082   while(pl != NULL) {
4083     if(count >= index) {
4084       ret_val = pl->key();
4085       break;
4086     }
4087     count++;
4088     pl = pl->next();
4089   }
4090 
4091   return ret_val;
4092 }
4093 
4094 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4095   int count = 0;
4096   char* ret_val = NULL;
4097 
4098   while(pl != NULL) {
4099     if(count >= index) {
4100       ret_val = pl->value();
4101       break;
4102     }
4103     count++;
4104     pl = pl->next();
4105   }
4106 
4107   return ret_val;
4108 }
4109 
4110 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4111   SystemProperty* p = *plist;
4112   if (p == NULL) {
4113     *plist = new_p;
4114   } else {
4115     while (p->next() != NULL) {
4116       p = p->next();
4117     }
4118     p->set_next(new_p);
4119   }
4120 }
4121 
4122 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4123   if (plist == NULL)
4124     return;
4125 
4126   SystemProperty* new_p = new SystemProperty(k, v, true);
4127   PropertyList_add(plist, new_p);
4128 }
4129 
4130 void Arguments::PropertyList_add(SystemProperty *element) {
4131   PropertyList_add(&_system_properties, element);
4132 }
4133 
4134 // This add maintains unique property key in the list.
4135 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4136   if (plist == NULL)
4137     return;
4138 
4139   // If property key exist then update with new value.
4140   SystemProperty* prop;
4141   for (prop = *plist; prop != NULL; prop = prop->next()) {
4142     if (strcmp(k, prop->key()) == 0) {
4143       if (append) {
4144         prop->append_value(v);
4145       } else {
4146         prop->set_value(v);
4147       }
4148       return;
4149     }
4150   }
4151 
4152   PropertyList_add(plist, k, v);
4153 }
4154 
4155 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4156 // Returns true if all of the source pointed by src has been copied over to
4157 // the destination buffer pointed by buf. Otherwise, returns false.
4158 // Notes:
4159 // 1. If the length (buflen) of the destination buffer excluding the
4160 // NULL terminator character is not long enough for holding the expanded
4161 // pid characters, it also returns false instead of returning the partially
4162 // expanded one.
4163 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4164 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4165                                 char* buf, size_t buflen) {
4166   const char* p = src;
4167   char* b = buf;
4168   const char* src_end = &src[srclen];
4169   char* buf_end = &buf[buflen - 1];
4170 
4171   while (p < src_end && b < buf_end) {
4172     if (*p == '%') {
4173       switch (*(++p)) {
4174       case '%':         // "%%" ==> "%"
4175         *b++ = *p++;
4176         break;
4177       case 'p':  {       //  "%p" ==> current process id
4178         // buf_end points to the character before the last character so
4179         // that we could write '\0' to the end of the buffer.
4180         size_t buf_sz = buf_end - b + 1;
4181         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4182 
4183         // if jio_snprintf fails or the buffer is not long enough to hold
4184         // the expanded pid, returns false.
4185         if (ret < 0 || ret >= (int)buf_sz) {
4186           return false;
4187         } else {
4188           b += ret;
4189           assert(*b == '\0', "fail in copy_expand_pid");
4190           if (p == src_end && b == buf_end + 1) {
4191             // reach the end of the buffer.
4192             return true;
4193           }
4194         }
4195         p++;
4196         break;
4197       }
4198       default :
4199         *b++ = '%';
4200       }
4201     } else {
4202       *b++ = *p++;
4203     }
4204   }
4205   *b = '\0';
4206   return (p == src_end); // return false if not all of the source was copied
4207 }