1 /*
   2  * Copyright (c) 1997, 2010, 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 "incls/_precompiled.incl"
  26 #include "incls/_arguments.cpp.incl"
  27 
  28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
  29 #define DEFAULT_JAVA_LAUNCHER  "generic"
  30 
  31 char**  Arguments::_jvm_flags_array             = NULL;
  32 int     Arguments::_num_jvm_flags               = 0;
  33 char**  Arguments::_jvm_args_array              = NULL;
  34 int     Arguments::_num_jvm_args                = 0;
  35 char*  Arguments::_java_command                 = NULL;
  36 SystemProperty* Arguments::_system_properties   = NULL;
  37 const char*  Arguments::_gc_log_filename        = NULL;
  38 bool   Arguments::_has_profile                  = false;
  39 bool   Arguments::_has_alloc_profile            = false;
  40 uintx  Arguments::_min_heap_size                = 0;
  41 Arguments::Mode Arguments::_mode                = _mixed;
  42 bool   Arguments::_java_compiler                = false;
  43 bool   Arguments::_xdebug_mode                  = false;
  44 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  45 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  46 int    Arguments::_sun_java_launcher_pid        = -1;
  47 
  48 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
  49 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  50 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  51 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  52 bool   Arguments::_ClipInlining                 = ClipInlining;
  53 intx   Arguments::_Tier2CompileThreshold        = Tier2CompileThreshold;
  54 
  55 char*  Arguments::SharedArchivePath             = NULL;
  56 
  57 AgentLibraryList Arguments::_libraryList;
  58 AgentLibraryList Arguments::_agentList;
  59 
  60 abort_hook_t     Arguments::_abort_hook         = NULL;
  61 exit_hook_t      Arguments::_exit_hook          = NULL;
  62 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
  63 
  64 
  65 SystemProperty *Arguments::_java_ext_dirs = NULL;
  66 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
  67 SystemProperty *Arguments::_sun_boot_library_path = NULL;
  68 SystemProperty *Arguments::_java_library_path = NULL;
  69 SystemProperty *Arguments::_java_home = NULL;
  70 SystemProperty *Arguments::_java_class_path = NULL;
  71 SystemProperty *Arguments::_sun_boot_class_path = NULL;
  72 
  73 char* Arguments::_meta_index_path = NULL;
  74 char* Arguments::_meta_index_dir = NULL;
  75 
  76 static bool force_client_mode = false;
  77 
  78 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
  79 
  80 static bool match_option(const JavaVMOption *option, const char* name,
  81                          const char** tail) {
  82   int len = (int)strlen(name);
  83   if (strncmp(option->optionString, name, len) == 0) {
  84     *tail = option->optionString + len;
  85     return true;
  86   } else {
  87     return false;
  88   }
  89 }
  90 
  91 static void logOption(const char* opt) {
  92   if (PrintVMOptions) {
  93     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
  94   }
  95 }
  96 
  97 // Process java launcher properties.
  98 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
  99   // See if sun.java.launcher or sun.java.launcher.pid is defined.
 100   // Must do this before setting up other system properties,
 101   // as some of them may depend on launcher type.
 102   for (int index = 0; index < args->nOptions; index++) {
 103     const JavaVMOption* option = args->options + index;
 104     const char* tail;
 105 
 106     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 107       process_java_launcher_argument(tail, option->extraInfo);
 108       continue;
 109     }
 110     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 111       _sun_java_launcher_pid = atoi(tail);
 112       continue;
 113     }
 114   }
 115 }
 116 
 117 // Initialize system properties key and value.
 118 void Arguments::init_system_properties() {
 119 
 120   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
 121   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 122                                                                  "Java Virtual Machine Specification",  false));
 123   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
 124                                                                  "Sun Microsystems Inc.",  false));
 125   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 126   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 127   PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 128   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 129 
 130   // following are JVMTI agent writeable properties.
 131   // Properties values are set to NULL and they are
 132   // os specific they are initialized in os::init_system_properties_values().
 133   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 134   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 135   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 136   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 137   _java_home =  new SystemProperty("java.home", NULL,  true);
 138   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 139 
 140   _java_class_path = new SystemProperty("java.class.path", "",  true);
 141 
 142   // Add to System Property list.
 143   PropertyList_add(&_system_properties, _java_ext_dirs);
 144   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 145   PropertyList_add(&_system_properties, _sun_boot_library_path);
 146   PropertyList_add(&_system_properties, _java_library_path);
 147   PropertyList_add(&_system_properties, _java_home);
 148   PropertyList_add(&_system_properties, _java_class_path);
 149   PropertyList_add(&_system_properties, _sun_boot_class_path);
 150 
 151   // Set OS specific system properties values
 152   os::init_system_properties_values();
 153 }
 154 
 155 /**
 156  * Provide a slightly more user-friendly way of eliminating -XX flags.
 157  * When a flag is eliminated, it can be added to this list in order to
 158  * continue accepting this flag on the command-line, while issuing a warning
 159  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 160  * limit, we flatly refuse to admit the existence of the flag.  This allows
 161  * a flag to die correctly over JDK releases using HSX.
 162  */
 163 typedef struct {
 164   const char* name;
 165   JDK_Version obsoleted_in; // when the flag went away
 166   JDK_Version accept_until; // which version to start denying the existence
 167 } ObsoleteFlag;
 168 
 169 static ObsoleteFlag obsolete_jvm_flags[] = {
 170   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 171   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 172   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 173   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 174   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 175   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 176   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 177   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 178   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 179   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 180   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 181   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 182   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 183   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 184   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 185   { "DefaultInitialRAMFraction",
 186                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 187   { NULL, JDK_Version(0), JDK_Version(0) }
 188 };
 189 
 190 // Returns true if the flag is obsolete and fits into the range specified
 191 // for being ignored.  In the case that the flag is ignored, the 'version'
 192 // value is filled in with the version number when the flag became
 193 // obsolete so that that value can be displayed to the user.
 194 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 195   int i = 0;
 196   assert(version != NULL, "Must provide a version buffer");
 197   while (obsolete_jvm_flags[i].name != NULL) {
 198     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 199     // <flag>=xxx form
 200     // [-|+]<flag> form
 201     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 202         ((s[0] == '+' || s[0] == '-') &&
 203         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 204       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 205           *version = flag_status.obsoleted_in;
 206           return true;
 207       }
 208     }
 209     i++;
 210   }
 211   return false;
 212 }
 213 
 214 // Constructs the system class path (aka boot class path) from the following
 215 // components, in order:
 216 //
 217 //     prefix           // from -Xbootclasspath/p:...
 218 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 219 //     base             // from os::get_system_properties() or -Xbootclasspath=
 220 //     suffix           // from -Xbootclasspath/a:...
 221 //
 222 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 223 // directories are added to the sysclasspath just before the base.
 224 //
 225 // This could be AllStatic, but it isn't needed after argument processing is
 226 // complete.
 227 class SysClassPath: public StackObj {
 228 public:
 229   SysClassPath(const char* base);
 230   ~SysClassPath();
 231 
 232   inline void set_base(const char* base);
 233   inline void add_prefix(const char* prefix);
 234   inline void add_suffix_to_prefix(const char* suffix);
 235   inline void add_suffix(const char* suffix);
 236   inline void reset_path(const char* base);
 237 
 238   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 239   // property.  Must be called after all command-line arguments have been
 240   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 241   // combined_path().
 242   void expand_endorsed();
 243 
 244   inline const char* get_base()     const { return _items[_scp_base]; }
 245   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 246   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 247   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 248 
 249   // Combine all the components into a single c-heap-allocated string; caller
 250   // must free the string if/when no longer needed.
 251   char* combined_path();
 252 
 253 private:
 254   // Utility routines.
 255   static char* add_to_path(const char* path, const char* str, bool prepend);
 256   static char* add_jars_to_path(char* path, const char* directory);
 257 
 258   inline void reset_item_at(int index);
 259 
 260   // Array indices for the items that make up the sysclasspath.  All except the
 261   // base are allocated in the C heap and freed by this class.
 262   enum {
 263     _scp_prefix,        // from -Xbootclasspath/p:...
 264     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 265     _scp_base,          // the default sysclasspath
 266     _scp_suffix,        // from -Xbootclasspath/a:...
 267     _scp_nitems         // the number of items, must be last.
 268   };
 269 
 270   const char* _items[_scp_nitems];
 271   DEBUG_ONLY(bool _expansion_done;)
 272 };
 273 
 274 SysClassPath::SysClassPath(const char* base) {
 275   memset(_items, 0, sizeof(_items));
 276   _items[_scp_base] = base;
 277   DEBUG_ONLY(_expansion_done = false;)
 278 }
 279 
 280 SysClassPath::~SysClassPath() {
 281   // Free everything except the base.
 282   for (int i = 0; i < _scp_nitems; ++i) {
 283     if (i != _scp_base) reset_item_at(i);
 284   }
 285   DEBUG_ONLY(_expansion_done = false;)
 286 }
 287 
 288 inline void SysClassPath::set_base(const char* base) {
 289   _items[_scp_base] = base;
 290 }
 291 
 292 inline void SysClassPath::add_prefix(const char* prefix) {
 293   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 294 }
 295 
 296 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 297   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 298 }
 299 
 300 inline void SysClassPath::add_suffix(const char* suffix) {
 301   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 302 }
 303 
 304 inline void SysClassPath::reset_item_at(int index) {
 305   assert(index < _scp_nitems && index != _scp_base, "just checking");
 306   if (_items[index] != NULL) {
 307     FREE_C_HEAP_ARRAY(char, _items[index]);
 308     _items[index] = NULL;
 309   }
 310 }
 311 
 312 inline void SysClassPath::reset_path(const char* base) {
 313   // Clear the prefix and suffix.
 314   reset_item_at(_scp_prefix);
 315   reset_item_at(_scp_suffix);
 316   set_base(base);
 317 }
 318 
 319 //------------------------------------------------------------------------------
 320 
 321 void SysClassPath::expand_endorsed() {
 322   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 323 
 324   const char* path = Arguments::get_property("java.endorsed.dirs");
 325   if (path == NULL) {
 326     path = Arguments::get_endorsed_dir();
 327     assert(path != NULL, "no default for java.endorsed.dirs");
 328   }
 329 
 330   char* expanded_path = NULL;
 331   const char separator = *os::path_separator();
 332   const char* const end = path + strlen(path);
 333   while (path < end) {
 334     const char* tmp_end = strchr(path, separator);
 335     if (tmp_end == NULL) {
 336       expanded_path = add_jars_to_path(expanded_path, path);
 337       path = end;
 338     } else {
 339       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
 340       memcpy(dirpath, path, tmp_end - path);
 341       dirpath[tmp_end - path] = '\0';
 342       expanded_path = add_jars_to_path(expanded_path, dirpath);
 343       FREE_C_HEAP_ARRAY(char, dirpath);
 344       path = tmp_end + 1;
 345     }
 346   }
 347   _items[_scp_endorsed] = expanded_path;
 348   DEBUG_ONLY(_expansion_done = true;)
 349 }
 350 
 351 // Combine the bootclasspath elements, some of which may be null, into a single
 352 // c-heap-allocated string.
 353 char* SysClassPath::combined_path() {
 354   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 355   assert(_expansion_done, "must call expand_endorsed() first.");
 356 
 357   size_t lengths[_scp_nitems];
 358   size_t total_len = 0;
 359 
 360   const char separator = *os::path_separator();
 361 
 362   // Get the lengths.
 363   int i;
 364   for (i = 0; i < _scp_nitems; ++i) {
 365     if (_items[i] != NULL) {
 366       lengths[i] = strlen(_items[i]);
 367       // Include space for the separator char (or a NULL for the last item).
 368       total_len += lengths[i] + 1;
 369     }
 370   }
 371   assert(total_len > 0, "empty sysclasspath not allowed");
 372 
 373   // Copy the _items to a single string.
 374   char* cp = NEW_C_HEAP_ARRAY(char, total_len);
 375   char* cp_tmp = cp;
 376   for (i = 0; i < _scp_nitems; ++i) {
 377     if (_items[i] != NULL) {
 378       memcpy(cp_tmp, _items[i], lengths[i]);
 379       cp_tmp += lengths[i];
 380       *cp_tmp++ = separator;
 381     }
 382   }
 383   *--cp_tmp = '\0';     // Replace the extra separator.
 384   return cp;
 385 }
 386 
 387 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 388 char*
 389 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 390   char *cp;
 391 
 392   assert(str != NULL, "just checking");
 393   if (path == NULL) {
 394     size_t len = strlen(str) + 1;
 395     cp = NEW_C_HEAP_ARRAY(char, len);
 396     memcpy(cp, str, len);                       // copy the trailing null
 397   } else {
 398     const char separator = *os::path_separator();
 399     size_t old_len = strlen(path);
 400     size_t str_len = strlen(str);
 401     size_t len = old_len + str_len + 2;
 402 
 403     if (prepend) {
 404       cp = NEW_C_HEAP_ARRAY(char, len);
 405       char* cp_tmp = cp;
 406       memcpy(cp_tmp, str, str_len);
 407       cp_tmp += str_len;
 408       *cp_tmp = separator;
 409       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 410       FREE_C_HEAP_ARRAY(char, path);
 411     } else {
 412       cp = REALLOC_C_HEAP_ARRAY(char, path, len);
 413       char* cp_tmp = cp + old_len;
 414       *cp_tmp = separator;
 415       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 416     }
 417   }
 418   return cp;
 419 }
 420 
 421 // Scan the directory and append any jar or zip files found to path.
 422 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 423 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 424   DIR* dir = os::opendir(directory);
 425   if (dir == NULL) return path;
 426 
 427   char dir_sep[2] = { '\0', '\0' };
 428   size_t directory_len = strlen(directory);
 429   const char fileSep = *os::file_separator();
 430   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 431 
 432   /* Scan the directory for jars/zips, appending them to path. */
 433   struct dirent *entry;
 434   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
 435   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 436     const char* name = entry->d_name;
 437     const char* ext = name + strlen(name) - 4;
 438     bool isJarOrZip = ext > name &&
 439       (os::file_name_strcmp(ext, ".jar") == 0 ||
 440        os::file_name_strcmp(ext, ".zip") == 0);
 441     if (isJarOrZip) {
 442       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
 443       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 444       path = add_to_path(path, jarpath, false);
 445       FREE_C_HEAP_ARRAY(char, jarpath);
 446     }
 447   }
 448   FREE_C_HEAP_ARRAY(char, dbuf);
 449   os::closedir(dir);
 450   return path;
 451 }
 452 
 453 // Parses a memory size specification string.
 454 static bool atomull(const char *s, julong* result) {
 455   julong n = 0;
 456   int args_read = sscanf(s, os::julong_format_specifier(), &n);
 457   if (args_read != 1) {
 458     return false;
 459   }
 460   while (*s != '\0' && isdigit(*s)) {
 461     s++;
 462   }
 463   // 4705540: illegal if more characters are found after the first non-digit
 464   if (strlen(s) > 1) {
 465     return false;
 466   }
 467   switch (*s) {
 468     case 'T': case 't':
 469       *result = n * G * K;
 470       // Check for overflow.
 471       if (*result/((julong)G * K) != n) return false;
 472       return true;
 473     case 'G': case 'g':
 474       *result = n * G;
 475       if (*result/G != n) return false;
 476       return true;
 477     case 'M': case 'm':
 478       *result = n * M;
 479       if (*result/M != n) return false;
 480       return true;
 481     case 'K': case 'k':
 482       *result = n * K;
 483       if (*result/K != n) return false;
 484       return true;
 485     case '\0':
 486       *result = n;
 487       return true;
 488     default:
 489       return false;
 490   }
 491 }
 492 
 493 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 494   if (size < min_size) return arg_too_small;
 495   // Check that size will fit in a size_t (only relevant on 32-bit)
 496   if (size > max_uintx) return arg_too_big;
 497   return arg_in_range;
 498 }
 499 
 500 // Describe an argument out of range error
 501 void Arguments::describe_range_error(ArgsRange errcode) {
 502   switch(errcode) {
 503   case arg_too_big:
 504     jio_fprintf(defaultStream::error_stream(),
 505                 "The specified size exceeds the maximum "
 506                 "representable size.\n");
 507     break;
 508   case arg_too_small:
 509   case arg_unreadable:
 510   case arg_in_range:
 511     // do nothing for now
 512     break;
 513   default:
 514     ShouldNotReachHere();
 515   }
 516 }
 517 
 518 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
 519   return CommandLineFlags::boolAtPut(name, &value, origin);
 520 }
 521 
 522 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
 523   double v;
 524   if (sscanf(value, "%lf", &v) != 1) {
 525     return false;
 526   }
 527 
 528   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 529     return true;
 530   }
 531   return false;
 532 }
 533 
 534 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
 535   julong v;
 536   intx intx_v;
 537   bool is_neg = false;
 538   // Check the sign first since atomull() parses only unsigned values.
 539   if (*value == '-') {
 540     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 541       return false;
 542     }
 543     value++;
 544     is_neg = true;
 545   }
 546   if (!atomull(value, &v)) {
 547     return false;
 548   }
 549   intx_v = (intx) v;
 550   if (is_neg) {
 551     intx_v = -intx_v;
 552   }
 553   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 554     return true;
 555   }
 556   uintx uintx_v = (uintx) v;
 557   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 558     return true;
 559   }
 560   uint64_t uint64_t_v = (uint64_t) v;
 561   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 562     return true;
 563   }
 564   return false;
 565 }
 566 
 567 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
 568   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 569   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 570   FREE_C_HEAP_ARRAY(char, value);
 571   return true;
 572 }
 573 
 574 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
 575   const char* old_value = "";
 576   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 577   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 578   size_t new_len = strlen(new_value);
 579   const char* value;
 580   char* free_this_too = NULL;
 581   if (old_len == 0) {
 582     value = new_value;
 583   } else if (new_len == 0) {
 584     value = old_value;
 585   } else {
 586     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
 587     // each new setting adds another LINE to the switch:
 588     sprintf(buf, "%s\n%s", old_value, new_value);
 589     value = buf;
 590     free_this_too = buf;
 591   }
 592   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 593   // CommandLineFlags always returns a pointer that needs freeing.
 594   FREE_C_HEAP_ARRAY(char, value);
 595   if (free_this_too != NULL) {
 596     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 597     FREE_C_HEAP_ARRAY(char, free_this_too);
 598   }
 599   return true;
 600 }
 601 
 602 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
 603 
 604   // range of acceptable characters spelled out for portability reasons
 605 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 606 #define BUFLEN 255
 607   char name[BUFLEN+1];
 608   char dummy;
 609 
 610   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 611     return set_bool_flag(name, false, origin);
 612   }
 613   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 614     return set_bool_flag(name, true, origin);
 615   }
 616 
 617   char punct;
 618   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 619     const char* value = strchr(arg, '=') + 1;
 620     Flag* flag = Flag::find_flag(name, strlen(name));
 621     if (flag != NULL && flag->is_ccstr()) {
 622       if (flag->ccstr_accumulates()) {
 623         return append_to_string_flag(name, value, origin);
 624       } else {
 625         if (value[0] == '\0') {
 626           value = NULL;
 627         }
 628         return set_string_flag(name, value, origin);
 629       }
 630     }
 631   }
 632 
 633   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 634     const char* value = strchr(arg, '=') + 1;
 635     // -XX:Foo:=xxx will reset the string flag to the given value.
 636     if (value[0] == '\0') {
 637       value = NULL;
 638     }
 639     return set_string_flag(name, value, origin);
 640   }
 641 
 642 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 643 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 644 #define        NUMBER_RANGE    "[0123456789]"
 645   char value[BUFLEN + 1];
 646   char value2[BUFLEN + 1];
 647   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 648     // Looks like a floating-point number -- try again with more lenient format string
 649     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 650       return set_fp_numeric_flag(name, value, origin);
 651     }
 652   }
 653 
 654 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 655   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 656     return set_numeric_flag(name, value, origin);
 657   }
 658 
 659   return false;
 660 }
 661 
 662 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 663   assert(bldarray != NULL, "illegal argument");
 664 
 665   if (arg == NULL) {
 666     return;
 667   }
 668 
 669   int index = *count;
 670 
 671   // expand the array and add arg to the last element
 672   (*count)++;
 673   if (*bldarray == NULL) {
 674     *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
 675   } else {
 676     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
 677   }
 678   (*bldarray)[index] = strdup(arg);
 679 }
 680 
 681 void Arguments::build_jvm_args(const char* arg) {
 682   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 683 }
 684 
 685 void Arguments::build_jvm_flags(const char* arg) {
 686   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 687 }
 688 
 689 // utility function to return a string that concatenates all
 690 // strings in a given char** array
 691 const char* Arguments::build_resource_string(char** args, int count) {
 692   if (args == NULL || count == 0) {
 693     return NULL;
 694   }
 695   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 696   for (int i = 1; i < count; i++) {
 697     length += strlen(args[i]) + 1; // add 1 for a space
 698   }
 699   char* s = NEW_RESOURCE_ARRAY(char, length);
 700   strcpy(s, args[0]);
 701   for (int j = 1; j < count; j++) {
 702     strcat(s, " ");
 703     strcat(s, args[j]);
 704   }
 705   return (const char*) s;
 706 }
 707 
 708 void Arguments::print_on(outputStream* st) {
 709   st->print_cr("VM Arguments:");
 710   if (num_jvm_flags() > 0) {
 711     st->print("jvm_flags: "); print_jvm_flags_on(st);
 712   }
 713   if (num_jvm_args() > 0) {
 714     st->print("jvm_args: "); print_jvm_args_on(st);
 715   }
 716   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 717   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 718 }
 719 
 720 void Arguments::print_jvm_flags_on(outputStream* st) {
 721   if (_num_jvm_flags > 0) {
 722     for (int i=0; i < _num_jvm_flags; i++) {
 723       st->print("%s ", _jvm_flags_array[i]);
 724     }
 725     st->print_cr("");
 726   }
 727 }
 728 
 729 void Arguments::print_jvm_args_on(outputStream* st) {
 730   if (_num_jvm_args > 0) {
 731     for (int i=0; i < _num_jvm_args; i++) {
 732       st->print("%s ", _jvm_args_array[i]);
 733     }
 734     st->print_cr("");
 735   }
 736 }
 737 
 738 bool Arguments::process_argument(const char* arg,
 739     jboolean ignore_unrecognized, FlagValueOrigin origin) {
 740 
 741   JDK_Version since = JDK_Version();
 742 
 743   if (parse_argument(arg, origin)) {
 744     // do nothing
 745   } else if (is_newly_obsolete(arg, &since)) {
 746     enum { bufsize = 256 };
 747     char buffer[bufsize];
 748     since.to_string(buffer, bufsize);
 749     jio_fprintf(defaultStream::error_stream(),
 750       "Warning: The flag %s has been EOL'd as of %s and will"
 751       " be ignored\n", arg, buffer);
 752   } else {
 753     if (!ignore_unrecognized) {
 754       jio_fprintf(defaultStream::error_stream(),
 755                   "Unrecognized VM option '%s'\n", arg);
 756       // allow for commandline "commenting out" options like -XX:#+Verbose
 757       if (strlen(arg) == 0 || arg[0] != '#') {
 758         return false;
 759       }
 760     }
 761   }
 762   return true;
 763 }
 764 
 765 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 766   FILE* stream = fopen(file_name, "rb");
 767   if (stream == NULL) {
 768     if (should_exist) {
 769       jio_fprintf(defaultStream::error_stream(),
 770                   "Could not open settings file %s\n", file_name);
 771       return false;
 772     } else {
 773       return true;
 774     }
 775   }
 776 
 777   char token[1024];
 778   int  pos = 0;
 779 
 780   bool in_white_space = true;
 781   bool in_comment     = false;
 782   bool in_quote       = false;
 783   char quote_c        = 0;
 784   bool result         = true;
 785 
 786   int c = getc(stream);
 787   while(c != EOF) {
 788     if (in_white_space) {
 789       if (in_comment) {
 790         if (c == '\n') in_comment = false;
 791       } else {
 792         if (c == '#') in_comment = true;
 793         else if (!isspace(c)) {
 794           in_white_space = false;
 795           token[pos++] = c;
 796         }
 797       }
 798     } else {
 799       if (c == '\n' || (!in_quote && isspace(c))) {
 800         // token ends at newline, or at unquoted whitespace
 801         // this allows a way to include spaces in string-valued options
 802         token[pos] = '\0';
 803         logOption(token);
 804         result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
 805         build_jvm_flags(token);
 806         pos = 0;
 807         in_white_space = true;
 808         in_quote = false;
 809       } else if (!in_quote && (c == '\'' || c == '"')) {
 810         in_quote = true;
 811         quote_c = c;
 812       } else if (in_quote && (c == quote_c)) {
 813         in_quote = false;
 814       } else {
 815         token[pos++] = c;
 816       }
 817     }
 818     c = getc(stream);
 819   }
 820   if (pos > 0) {
 821     token[pos] = '\0';
 822     result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
 823     build_jvm_flags(token);
 824   }
 825   fclose(stream);
 826   return result;
 827 }
 828 
 829 //=============================================================================================================
 830 // Parsing of properties (-D)
 831 
 832 const char* Arguments::get_property(const char* key) {
 833   return PropertyList_get_value(system_properties(), key);
 834 }
 835 
 836 bool Arguments::add_property(const char* prop) {
 837   const char* eq = strchr(prop, '=');
 838   char* key;
 839   // ns must be static--its address may be stored in a SystemProperty object.
 840   const static char ns[1] = {0};
 841   char* value = (char *)ns;
 842 
 843   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
 844   key = AllocateHeap(key_len + 1, "add_property");
 845   strncpy(key, prop, key_len);
 846   key[key_len] = '\0';
 847 
 848   if (eq != NULL) {
 849     size_t value_len = strlen(prop) - key_len - 1;
 850     value = AllocateHeap(value_len + 1, "add_property");
 851     strncpy(value, &prop[key_len + 1], value_len + 1);
 852   }
 853 
 854   if (strcmp(key, "java.compiler") == 0) {
 855     process_java_compiler_argument(value);
 856     FreeHeap(key);
 857     if (eq != NULL) {
 858       FreeHeap(value);
 859     }
 860     return true;
 861   } else if (strcmp(key, "sun.java.command") == 0) {
 862     _java_command = value;
 863 
 864     // don't add this property to the properties exposed to the java application
 865     FreeHeap(key);
 866     return true;
 867   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
 868     // launcher.pid property is private and is processed
 869     // in process_sun_java_launcher_properties();
 870     // the sun.java.launcher property is passed on to the java application
 871     FreeHeap(key);
 872     if (eq != NULL) {
 873       FreeHeap(value);
 874     }
 875     return true;
 876   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
 877     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
 878     // its value without going through the property list or making a Java call.
 879     _java_vendor_url_bug = value;
 880   } else if (strcmp(key, "sun.boot.library.path") == 0) {
 881     PropertyList_unique_add(&_system_properties, key, value, true);
 882     return true;
 883   }
 884   // Create new property and add at the end of the list
 885   PropertyList_unique_add(&_system_properties, key, value);
 886   return true;
 887 }
 888 
 889 //===========================================================================================================
 890 // Setting int/mixed/comp mode flags
 891 
 892 void Arguments::set_mode_flags(Mode mode) {
 893   // Set up default values for all flags.
 894   // If you add a flag to any of the branches below,
 895   // add a default value for it here.
 896   set_java_compiler(false);
 897   _mode                      = mode;
 898 
 899   // Ensure Agent_OnLoad has the correct initial values.
 900   // This may not be the final mode; mode may change later in onload phase.
 901   PropertyList_unique_add(&_system_properties, "java.vm.info",
 902                           (char*)Abstract_VM_Version::vm_info_string(), false);
 903 
 904   UseInterpreter             = true;
 905   UseCompiler                = true;
 906   UseLoopCounter             = true;
 907 
 908   // Default values may be platform/compiler dependent -
 909   // use the saved values
 910   ClipInlining               = Arguments::_ClipInlining;
 911   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
 912   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
 913   BackgroundCompilation      = Arguments::_BackgroundCompilation;
 914   Tier2CompileThreshold      = Arguments::_Tier2CompileThreshold;
 915 
 916   // Change from defaults based on mode
 917   switch (mode) {
 918   default:
 919     ShouldNotReachHere();
 920     break;
 921   case _int:
 922     UseCompiler              = false;
 923     UseLoopCounter           = false;
 924     AlwaysCompileLoopMethods = false;
 925     UseOnStackReplacement    = false;
 926     break;
 927   case _mixed:
 928     // same as default
 929     break;
 930   case _comp:
 931     UseInterpreter           = false;
 932     BackgroundCompilation    = false;
 933     ClipInlining             = false;
 934     break;
 935   }
 936 }
 937 
 938 // Conflict: required to use shared spaces (-Xshare:on), but
 939 // incompatible command line options were chosen.
 940 
 941 static void no_shared_spaces() {
 942   if (RequireSharedSpaces) {
 943     jio_fprintf(defaultStream::error_stream(),
 944       "Class data sharing is inconsistent with other specified options.\n");
 945     vm_exit_during_initialization("Unable to use shared archive.", NULL);
 946   } else {
 947     FLAG_SET_DEFAULT(UseSharedSpaces, false);
 948   }
 949 }
 950 
 951 #ifndef KERNEL
 952 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
 953 // if it's not explictly set or unset. If the user has chosen
 954 // UseParNewGC and not explicitly set ParallelGCThreads we
 955 // set it, unless this is a single cpu machine.
 956 void Arguments::set_parnew_gc_flags() {
 957   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
 958          "control point invariant");
 959   assert(UseParNewGC, "Error");
 960 
 961   // Turn off AdaptiveSizePolicy by default for parnew until it is
 962   // complete.
 963   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
 964     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
 965   }
 966 
 967   if (ParallelGCThreads == 0) {
 968     FLAG_SET_DEFAULT(ParallelGCThreads,
 969                      Abstract_VM_Version::parallel_worker_threads());
 970     if (ParallelGCThreads == 1) {
 971       FLAG_SET_DEFAULT(UseParNewGC, false);
 972       FLAG_SET_DEFAULT(ParallelGCThreads, 0);
 973     }
 974   }
 975   if (UseParNewGC) {
 976     // CDS doesn't work with ParNew yet
 977     no_shared_spaces();
 978 
 979     // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
 980     // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
 981     // we set them to 1024 and 1024.
 982     // See CR 6362902.
 983     if (FLAG_IS_DEFAULT(YoungPLABSize)) {
 984       FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
 985     }
 986     if (FLAG_IS_DEFAULT(OldPLABSize)) {
 987       FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
 988     }
 989 
 990     // AlwaysTenure flag should make ParNew promote all at first collection.
 991     // See CR 6362902.
 992     if (AlwaysTenure) {
 993       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
 994     }
 995     // When using compressed oops, we use local overflow stacks,
 996     // rather than using a global overflow list chained through
 997     // the klass word of the object's pre-image.
 998     if (UseCompressedOops && !ParGCUseLocalOverflow) {
 999       if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1000         warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1001       }
1002       FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1003     }
1004     assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1005   }
1006 }
1007 
1008 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1009 // sparc/solaris for certain applications, but would gain from
1010 // further optimization and tuning efforts, and would almost
1011 // certainly gain from analysis of platform and environment.
1012 void Arguments::set_cms_and_parnew_gc_flags() {
1013   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1014   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1015 
1016   // If we are using CMS, we prefer to UseParNewGC,
1017   // unless explicitly forbidden.
1018   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1019     FLAG_SET_ERGO(bool, UseParNewGC, true);
1020   }
1021 
1022   // Turn off AdaptiveSizePolicy by default for cms until it is
1023   // complete.
1024   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1025     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1026   }
1027 
1028   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1029   // as needed.
1030   if (UseParNewGC) {
1031     set_parnew_gc_flags();
1032   }
1033 
1034   // Now make adjustments for CMS
1035   size_t young_gen_per_worker;
1036   intx new_ratio;
1037   size_t min_new_default;
1038   intx tenuring_default;
1039   if (CMSUseOldDefaults) {  // old defaults: "old" as of 6.0
1040     if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1041       FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1042     }
1043     young_gen_per_worker = 4*M;
1044     new_ratio = (intx)15;
1045     min_new_default = 4*M;
1046     tenuring_default = (intx)0;
1047   } else { // new defaults: "new" as of 6.0
1048     young_gen_per_worker = CMSYoungGenPerWorker;
1049     new_ratio = (intx)7;
1050     min_new_default = 16*M;
1051     tenuring_default = (intx)4;
1052   }
1053 
1054   // Preferred young gen size for "short" pauses
1055   const uintx parallel_gc_threads =
1056     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1057   const size_t preferred_max_new_size_unaligned =
1058     ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1059   const size_t preferred_max_new_size =
1060     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1061 
1062   // Unless explicitly requested otherwise, size young gen
1063   // for "short" pauses ~ 4M*ParallelGCThreads
1064 
1065   // If either MaxNewSize or NewRatio is set on the command line,
1066   // assume the user is trying to set the size of the young gen.
1067 
1068   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1069 
1070     // Set MaxNewSize to our calculated preferred_max_new_size unless
1071     // NewSize was set on the command line and it is larger than
1072     // preferred_max_new_size.
1073     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1074       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1075     } else {
1076       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1077     }
1078     if (PrintGCDetails && Verbose) {
1079       // Too early to use gclog_or_tty
1080       tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1081     }
1082 
1083     // Unless explicitly requested otherwise, prefer a large
1084     // Old to Young gen size so as to shift the collection load
1085     // to the old generation concurrent collector
1086 
1087     // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1088     // then NewSize and OldSize may be calculated.  That would
1089     // generally lead to some differences with ParNewGC for which
1090     // there was no obvious reason.  Also limit to the case where
1091     // MaxNewSize has not been set.
1092 
1093     FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1094 
1095     // Code along this path potentially sets NewSize and OldSize
1096 
1097     // Calculate the desired minimum size of the young gen but if
1098     // NewSize has been set on the command line, use it here since
1099     // it should be the final value.
1100     size_t min_new;
1101     if (FLAG_IS_DEFAULT(NewSize)) {
1102       min_new = align_size_up(ScaleForWordSize(min_new_default),
1103                               os::vm_page_size());
1104     } else {
1105       min_new = NewSize;
1106     }
1107     size_t prev_initial_size = InitialHeapSize;
1108     if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1109       FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1110       // Currently minimum size and the initial heap sizes are the same.
1111       set_min_heap_size(InitialHeapSize);
1112       if (PrintGCDetails && Verbose) {
1113         warning("Initial heap size increased to " SIZE_FORMAT " M from "
1114                 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1115                 InitialHeapSize/M, prev_initial_size/M);
1116       }
1117     }
1118 
1119     // MaxHeapSize is aligned down in collectorPolicy
1120     size_t max_heap =
1121       align_size_down(MaxHeapSize,
1122                       CardTableRS::ct_max_alignment_constraint());
1123 
1124     if (PrintGCDetails && Verbose) {
1125       // Too early to use gclog_or_tty
1126       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1127            " initial_heap_size:  " SIZE_FORMAT
1128            " max_heap: " SIZE_FORMAT,
1129            min_heap_size(), InitialHeapSize, max_heap);
1130     }
1131     if (max_heap > min_new) {
1132       // Unless explicitly requested otherwise, make young gen
1133       // at least min_new, and at most preferred_max_new_size.
1134       if (FLAG_IS_DEFAULT(NewSize)) {
1135         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1136         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1137         if (PrintGCDetails && Verbose) {
1138           // Too early to use gclog_or_tty
1139           tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1140         }
1141       }
1142       // Unless explicitly requested otherwise, size old gen
1143       // so that it's at least 3X of NewSize to begin with;
1144       // later NewRatio will decide how it grows; see above.
1145       if (FLAG_IS_DEFAULT(OldSize)) {
1146         if (max_heap > NewSize) {
1147           FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1148           if (PrintGCDetails && Verbose) {
1149             // Too early to use gclog_or_tty
1150             tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1151           }
1152         }
1153       }
1154     }
1155   }
1156   // Unless explicitly requested otherwise, definitely
1157   // promote all objects surviving "tenuring_default" scavenges.
1158   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1159       FLAG_IS_DEFAULT(SurvivorRatio)) {
1160     FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1161   }
1162   // If we decided above (or user explicitly requested)
1163   // `promote all' (via MaxTenuringThreshold := 0),
1164   // prefer minuscule survivor spaces so as not to waste
1165   // space for (non-existent) survivors
1166   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1167     FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1168   }
1169   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1170   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1171   // This is done in order to make ParNew+CMS configuration to work
1172   // with YoungPLABSize and OldPLABSize options.
1173   // See CR 6362902.
1174   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1175     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1176       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1177       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1178       // the value (either from the command line or ergonomics) of
1179       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1180       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1181     } else {
1182       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1183       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1184       // we'll let it to take precedence.
1185       jio_fprintf(defaultStream::error_stream(),
1186                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1187                   " options are specified for the CMS collector."
1188                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1189     }
1190   }
1191   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1192     // OldPLAB sizing manually turned off: Use a larger default setting,
1193     // unless it was manually specified. This is because a too-low value
1194     // will slow down scavenges.
1195     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1196       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1197     }
1198   }
1199   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1200   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1201   // If either of the static initialization defaults have changed, note this
1202   // modification.
1203   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1204     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1205   }
1206   if (PrintGCDetails && Verbose) {
1207     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1208       MarkStackSize / K, MarkStackSizeMax / K);
1209     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1210   }
1211 }
1212 #endif // KERNEL
1213 
1214 void set_object_alignment() {
1215   // Object alignment.
1216   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1217   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1218   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1219   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1220   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1221   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1222 
1223   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1224   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1225 
1226   // Oop encoding heap max
1227   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1228 
1229 #ifndef KERNEL
1230   // Set CMS global values
1231   CompactibleFreeListSpace::set_cms_values();
1232 #endif // KERNEL
1233 }
1234 
1235 bool verify_object_alignment() {
1236   // Object alignment.
1237   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1238     jio_fprintf(defaultStream::error_stream(),
1239                 "error: ObjectAlignmentInBytes=%d must be power of 2", (int)ObjectAlignmentInBytes);
1240     return false;
1241   }
1242   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1243     jio_fprintf(defaultStream::error_stream(),
1244                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d", (int)ObjectAlignmentInBytes, BytesPerLong);
1245     return false;
1246   }
1247   return true;
1248 }
1249 
1250 inline uintx max_heap_for_compressed_oops() {
1251   LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1252   NOT_LP64(ShouldNotReachHere(); return 0);
1253 }
1254 
1255 bool Arguments::should_auto_select_low_pause_collector() {
1256   if (UseAutoGCSelectPolicy &&
1257       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1258       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1259     if (PrintGCDetails) {
1260       // Cannot use gclog_or_tty yet.
1261       tty->print_cr("Automatic selection of the low pause collector"
1262        " based on pause goal of %d (ms)", MaxGCPauseMillis);
1263     }
1264     return true;
1265   }
1266   return false;
1267 }
1268 
1269 void Arguments::set_ergonomics_flags() {
1270   // Parallel GC is not compatible with sharing. If one specifies
1271   // that they want sharing explicitly, do not set ergonomics flags.
1272   if (DumpSharedSpaces || ForceSharedSpaces) {
1273     return;
1274   }
1275 
1276   if (os::is_server_class_machine() && !force_client_mode ) {
1277     // If no other collector is requested explicitly,
1278     // let the VM select the collector based on
1279     // machine class and automatic selection policy.
1280     if (!UseSerialGC &&
1281         !UseConcMarkSweepGC &&
1282         !UseG1GC &&
1283         !UseParNewGC &&
1284         !DumpSharedSpaces &&
1285         FLAG_IS_DEFAULT(UseParallelGC)) {
1286       if (should_auto_select_low_pause_collector()) {
1287         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1288       } else {
1289         FLAG_SET_ERGO(bool, UseParallelGC, true);
1290       }
1291       no_shared_spaces();
1292     }
1293   }
1294 
1295 #ifndef ZERO
1296 #ifdef _LP64
1297   // Check that UseCompressedOops can be set with the max heap size allocated
1298   // by ergonomics.
1299   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1300 #ifndef COMPILER1
1301     if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1302       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1303     }
1304 #endif
1305 #ifdef _WIN64
1306     if (UseLargePages && UseCompressedOops) {
1307       // Cannot allocate guard pages for implicit checks in indexed addressing
1308       // mode, when large pages are specified on windows.
1309       // This flag could be switched ON if narrow oop base address is set to 0,
1310       // see code in Universe::initialize_heap().
1311       Universe::set_narrow_oop_use_implicit_null_checks(false);
1312     }
1313 #endif //  _WIN64
1314   } else {
1315     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1316       warning("Max heap size too large for Compressed Oops");
1317       FLAG_SET_DEFAULT(UseCompressedOops, false);
1318     }
1319   }
1320   // Also checks that certain machines are slower with compressed oops
1321   // in vm_version initialization code.
1322 #endif // _LP64
1323 #endif // !ZERO
1324 }
1325 
1326 void Arguments::set_parallel_gc_flags() {
1327   assert(UseParallelGC || UseParallelOldGC, "Error");
1328   // If parallel old was requested, automatically enable parallel scavenge.
1329   if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1330     FLAG_SET_DEFAULT(UseParallelGC, true);
1331   }
1332 
1333   // If no heap maximum was requested explicitly, use some reasonable fraction
1334   // of the physical memory, up to a maximum of 1GB.
1335   if (UseParallelGC) {
1336     FLAG_SET_ERGO(uintx, ParallelGCThreads,
1337                   Abstract_VM_Version::parallel_worker_threads());
1338 
1339     // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1340     // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1341     // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1342     // See CR 6362902 for details.
1343     if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1344       if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1345          FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1346       }
1347       if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1348         FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1349       }
1350     }
1351 
1352     if (UseParallelOldGC) {
1353       // Par compact uses lower default values since they are treated as
1354       // minimums.  These are different defaults because of the different
1355       // interpretation and are not ergonomically set.
1356       if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1357         FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1358       }
1359       if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1360         FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1361       }
1362     }
1363   }
1364 }
1365 
1366 void Arguments::set_g1_gc_flags() {
1367   assert(UseG1GC, "Error");
1368 #ifdef COMPILER1
1369   FastTLABRefill = false;
1370 #endif
1371   FLAG_SET_DEFAULT(ParallelGCThreads,
1372                      Abstract_VM_Version::parallel_worker_threads());
1373   if (ParallelGCThreads == 0) {
1374     FLAG_SET_DEFAULT(ParallelGCThreads,
1375                      Abstract_VM_Version::parallel_worker_threads());
1376   }
1377   no_shared_spaces();
1378 
1379   if (FLAG_IS_DEFAULT(MarkStackSize)) {
1380     FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1381   }
1382   if (PrintGCDetails && Verbose) {
1383     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1384       MarkStackSize / K, MarkStackSizeMax / K);
1385     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1386   }
1387 
1388   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1389     // In G1, we want the default GC overhead goal to be higher than
1390     // say in PS. So we set it here to 10%. Otherwise the heap might
1391     // be expanded more aggressively than we would like it to. In
1392     // fact, even 10% seems to not be high enough in some cases
1393     // (especially small GC stress tests that the main thing they do
1394     // is allocation). We might consider increase it further.
1395     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1396   }
1397 }
1398 
1399 void Arguments::set_heap_size() {
1400   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1401     // Deprecated flag
1402     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1403   }
1404 
1405   const julong phys_mem =
1406     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1407                             : (julong)MaxRAM;
1408 
1409   // If the maximum heap size has not been set with -Xmx,
1410   // then set it as fraction of the size of physical memory,
1411   // respecting the maximum and minimum sizes of the heap.
1412   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1413     julong reasonable_max = phys_mem / MaxRAMFraction;
1414 
1415     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1416       // Small physical memory, so use a minimum fraction of it for the heap
1417       reasonable_max = phys_mem / MinRAMFraction;
1418     } else {
1419       // Not-small physical memory, so require a heap at least
1420       // as large as MaxHeapSize
1421       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1422     }
1423     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1424       // Limit the heap size to ErgoHeapSizeLimit
1425       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1426     }
1427     if (UseCompressedOops) {
1428       // Limit the heap size to the maximum possible when using compressed oops
1429       reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops());
1430     }
1431     reasonable_max = os::allocatable_physical_memory(reasonable_max);
1432 
1433     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1434       // An initial heap size was specified on the command line,
1435       // so be sure that the maximum size is consistent.  Done
1436       // after call to allocatable_physical_memory because that
1437       // method might reduce the allocation size.
1438       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1439     }
1440 
1441     if (PrintGCDetails && Verbose) {
1442       // Cannot use gclog_or_tty yet.
1443       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
1444     }
1445     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1446   }
1447 
1448   // If the initial_heap_size has not been set with InitialHeapSize
1449   // or -Xms, then set it as fraction of the size of physical memory,
1450   // respecting the maximum and minimum sizes of the heap.
1451   if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1452     julong reasonable_minimum = (julong)(OldSize + NewSize);
1453 
1454     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1455 
1456     reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1457 
1458     julong reasonable_initial = phys_mem / InitialRAMFraction;
1459 
1460     reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1461     reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1462 
1463     reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1464 
1465     if (PrintGCDetails && Verbose) {
1466       // Cannot use gclog_or_tty yet.
1467       tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1468       tty->print_cr("  Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1469     }
1470     FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1471     set_min_heap_size((uintx)reasonable_minimum);
1472   }
1473 }
1474 
1475 // This must be called after ergonomics because we want bytecode rewriting
1476 // if the server compiler is used, or if UseSharedSpaces is disabled.
1477 void Arguments::set_bytecode_flags() {
1478   // Better not attempt to store into a read-only space.
1479   if (UseSharedSpaces) {
1480     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1481     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1482   }
1483 
1484   if (!RewriteBytecodes) {
1485     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1486   }
1487 }
1488 
1489 // Aggressive optimization flags  -XX:+AggressiveOpts
1490 void Arguments::set_aggressive_opts_flags() {
1491 #ifdef COMPILER2
1492   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1493     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1494       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1495     }
1496     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1497       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1498     }
1499 
1500     // Feed the cache size setting into the JDK
1501     char buffer[1024];
1502     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1503     add_property(buffer);
1504   }
1505   if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1506     FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1507   }
1508   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1509     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1510   }
1511   if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1512     FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1513   }
1514 #endif
1515 
1516   if (AggressiveOpts) {
1517 // Sample flag setting code
1518 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1519 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1520 //    }
1521   }
1522 }
1523 
1524 //===========================================================================================================
1525 // Parsing of java.compiler property
1526 
1527 void Arguments::process_java_compiler_argument(char* arg) {
1528   // For backwards compatibility, Djava.compiler=NONE or ""
1529   // causes us to switch to -Xint mode UNLESS -Xdebug
1530   // is also specified.
1531   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1532     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1533   }
1534 }
1535 
1536 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1537   _sun_java_launcher = strdup(launcher);
1538 }
1539 
1540 bool Arguments::created_by_java_launcher() {
1541   assert(_sun_java_launcher != NULL, "property must have value");
1542   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1543 }
1544 
1545 //===========================================================================================================
1546 // Parsing of main arguments
1547 
1548 bool Arguments::verify_interval(uintx val, uintx min,
1549                                 uintx max, const char* name) {
1550   // Returns true iff value is in the inclusive interval [min..max]
1551   // false, otherwise.
1552   if (val >= min && val <= max) {
1553     return true;
1554   }
1555   jio_fprintf(defaultStream::error_stream(),
1556               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1557               " and " UINTX_FORMAT "\n",
1558               name, val, min, max);
1559   return false;
1560 }
1561 
1562 bool Arguments::verify_percentage(uintx value, const char* name) {
1563   if (value <= 100) {
1564     return true;
1565   }
1566   jio_fprintf(defaultStream::error_stream(),
1567               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1568               name, value);
1569   return false;
1570 }
1571 
1572 static void force_serial_gc() {
1573   FLAG_SET_DEFAULT(UseSerialGC, true);
1574   FLAG_SET_DEFAULT(UseParNewGC, false);
1575   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1576   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
1577   FLAG_SET_DEFAULT(UseParallelGC, false);
1578   FLAG_SET_DEFAULT(UseParallelOldGC, false);
1579   FLAG_SET_DEFAULT(UseG1GC, false);
1580 }
1581 
1582 static bool verify_serial_gc_flags() {
1583   return (UseSerialGC &&
1584         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1585           UseParallelGC || UseParallelOldGC));
1586 }
1587 
1588 // Check consistency of GC selection
1589 bool Arguments::check_gc_consistency() {
1590   bool status = true;
1591   // Ensure that the user has not selected conflicting sets
1592   // of collectors. [Note: this check is merely a user convenience;
1593   // collectors over-ride each other so that only a non-conflicting
1594   // set is selected; however what the user gets is not what they
1595   // may have expected from the combination they asked for. It's
1596   // better to reduce user confusion by not allowing them to
1597   // select conflicting combinations.
1598   uint i = 0;
1599   if (UseSerialGC)                       i++;
1600   if (UseConcMarkSweepGC || UseParNewGC) i++;
1601   if (UseParallelGC || UseParallelOldGC) i++;
1602   if (UseG1GC)                           i++;
1603   if (i > 1) {
1604     jio_fprintf(defaultStream::error_stream(),
1605                 "Conflicting collector combinations in option list; "
1606                 "please refer to the release notes for the combinations "
1607                 "allowed\n");
1608     status = false;
1609   }
1610 
1611   return status;
1612 }
1613 
1614 // Check the consistency of vm_init_args
1615 bool Arguments::check_vm_args_consistency() {
1616   // Method for adding checks for flag consistency.
1617   // The intent is to warn the user of all possible conflicts,
1618   // before returning an error.
1619   // Note: Needs platform-dependent factoring.
1620   bool status = true;
1621 
1622 #if ( (defined(COMPILER2) && defined(SPARC)))
1623   // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1624   // on sparc doesn't require generation of a stub as is the case on, e.g.,
1625   // x86.  Normally, VM_Version_init must be called from init_globals in
1626   // init.cpp, which is called by the initial java thread *after* arguments
1627   // have been parsed.  VM_Version_init gets called twice on sparc.
1628   extern void VM_Version_init();
1629   VM_Version_init();
1630   if (!VM_Version::has_v9()) {
1631     jio_fprintf(defaultStream::error_stream(),
1632                 "V8 Machine detected, Server requires V9\n");
1633     status = false;
1634   }
1635 #endif /* COMPILER2 && SPARC */
1636 
1637   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1638   // builds so the cost of stack banging can be measured.
1639 #if (defined(PRODUCT) && defined(SOLARIS))
1640   if (!UseBoundThreads && !UseStackBanging) {
1641     jio_fprintf(defaultStream::error_stream(),
1642                 "-UseStackBanging conflicts with -UseBoundThreads\n");
1643 
1644      status = false;
1645   }
1646 #endif
1647 
1648   if (TLABRefillWasteFraction == 0) {
1649     jio_fprintf(defaultStream::error_stream(),
1650                 "TLABRefillWasteFraction should be a denominator, "
1651                 "not " SIZE_FORMAT "\n",
1652                 TLABRefillWasteFraction);
1653     status = false;
1654   }
1655 
1656   status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1657                               "MaxLiveObjectEvacuationRatio");
1658   status = status && verify_percentage(AdaptiveSizePolicyWeight,
1659                               "AdaptiveSizePolicyWeight");
1660   status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1661   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1662   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1663   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1664 
1665   if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1666     jio_fprintf(defaultStream::error_stream(),
1667                 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1668                 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1669                 MinHeapFreeRatio, MaxHeapFreeRatio);
1670     status = false;
1671   }
1672   // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1673   MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1674 
1675   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1676     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
1677   }
1678 
1679   if (UseParallelOldGC && ParallelOldGCSplitALot) {
1680     // Settings to encourage splitting.
1681     if (!FLAG_IS_CMDLINE(NewRatio)) {
1682       FLAG_SET_CMDLINE(intx, NewRatio, 2);
1683     }
1684     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1685       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1686     }
1687   }
1688 
1689   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1690   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1691   if (GCTimeLimit == 100) {
1692     // Turn off gc-overhead-limit-exceeded checks
1693     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1694   }
1695 
1696   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1697 
1698   // Check whether user-specified sharing option conflicts with GC or page size.
1699   // Both sharing and large pages are enabled by default on some platforms;
1700   // large pages override sharing only if explicitly set on the command line.
1701   const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1702           UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1703           UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1704   if (cannot_share) {
1705     // Either force sharing on by forcing the other options off, or
1706     // force sharing off.
1707     if (DumpSharedSpaces || ForceSharedSpaces) {
1708       jio_fprintf(defaultStream::error_stream(),
1709                   "Using Serial GC and default page size because of %s\n",
1710                   ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1711       force_serial_gc();
1712       FLAG_SET_DEFAULT(UseLargePages, false);
1713     } else {
1714       if (UseSharedSpaces && Verbose) {
1715         jio_fprintf(defaultStream::error_stream(),
1716                     "Turning off use of shared archive because of "
1717                     "choice of garbage collector or large pages\n");
1718       }
1719       no_shared_spaces();
1720     }
1721   } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1722     FLAG_SET_DEFAULT(UseLargePages, false);
1723   }
1724 
1725   status = status && check_gc_consistency();
1726 
1727   if (_has_alloc_profile) {
1728     if (UseParallelGC || UseParallelOldGC) {
1729       jio_fprintf(defaultStream::error_stream(),
1730                   "error:  invalid argument combination.\n"
1731                   "Allocation profiling (-Xaprof) cannot be used together with "
1732                   "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1733       status = false;
1734     }
1735     if (UseConcMarkSweepGC) {
1736       jio_fprintf(defaultStream::error_stream(),
1737                   "error:  invalid argument combination.\n"
1738                   "Allocation profiling (-Xaprof) cannot be used together with "
1739                   "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1740       status = false;
1741     }
1742   }
1743 
1744   if (CMSIncrementalMode) {
1745     if (!UseConcMarkSweepGC) {
1746       jio_fprintf(defaultStream::error_stream(),
1747                   "error:  invalid argument combination.\n"
1748                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1749                   "selected in order\nto use CMSIncrementalMode.\n");
1750       status = false;
1751     } else {
1752       status = status && verify_percentage(CMSIncrementalDutyCycle,
1753                                   "CMSIncrementalDutyCycle");
1754       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1755                                   "CMSIncrementalDutyCycleMin");
1756       status = status && verify_percentage(CMSIncrementalSafetyFactor,
1757                                   "CMSIncrementalSafetyFactor");
1758       status = status && verify_percentage(CMSIncrementalOffset,
1759                                   "CMSIncrementalOffset");
1760       status = status && verify_percentage(CMSExpAvgFactor,
1761                                   "CMSExpAvgFactor");
1762       // If it was not set on the command line, set
1763       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1764       if (CMSInitiatingOccupancyFraction < 0) {
1765         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1766       }
1767     }
1768   }
1769 
1770   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1771   // insists that we hold the requisite locks so that the iteration is
1772   // MT-safe. For the verification at start-up and shut-down, we don't
1773   // yet have a good way of acquiring and releasing these locks,
1774   // which are not visible at the CollectedHeap level. We want to
1775   // be able to acquire these locks and then do the iteration rather
1776   // than just disable the lock verification. This will be fixed under
1777   // bug 4788986.
1778   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1779     if (VerifyGCStartAt == 0) {
1780       warning("Heap verification at start-up disabled "
1781               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1782       VerifyGCStartAt = 1;      // Disable verification at start-up
1783     }
1784     if (VerifyBeforeExit) {
1785       warning("Heap verification at shutdown disabled "
1786               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1787       VerifyBeforeExit = false; // Disable verification at shutdown
1788     }
1789   }
1790 
1791   // Note: only executed in non-PRODUCT mode
1792   if (!UseAsyncConcMarkSweepGC &&
1793       (ExplicitGCInvokesConcurrent ||
1794        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1795     jio_fprintf(defaultStream::error_stream(),
1796                 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1797                 " with -UseAsyncConcMarkSweepGC");
1798     status = false;
1799   }
1800 
1801   if (UseG1GC) {
1802     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1803                                          "InitiatingHeapOccupancyPercent");
1804   }
1805 
1806   status = status && verify_interval(RefDiscoveryPolicy,
1807                                      ReferenceProcessor::DiscoveryPolicyMin,
1808                                      ReferenceProcessor::DiscoveryPolicyMax,
1809                                      "RefDiscoveryPolicy");
1810 
1811   // Limit the lower bound of this flag to 1 as it is used in a division
1812   // expression.
1813   status = status && verify_interval(TLABWasteTargetPercent,
1814                                      1, 100, "TLABWasteTargetPercent");
1815 
1816   status = status && verify_object_alignment();
1817 
1818   return status;
1819 }
1820 
1821 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1822   const char* option_type) {
1823   if (ignore) return false;
1824 
1825   const char* spacer = " ";
1826   if (option_type == NULL) {
1827     option_type = ++spacer; // Set both to the empty string.
1828   }
1829 
1830   if (os::obsolete_option(option)) {
1831     jio_fprintf(defaultStream::error_stream(),
1832                 "Obsolete %s%soption: %s\n", option_type, spacer,
1833       option->optionString);
1834     return false;
1835   } else {
1836     jio_fprintf(defaultStream::error_stream(),
1837                 "Unrecognized %s%soption: %s\n", option_type, spacer,
1838       option->optionString);
1839     return true;
1840   }
1841 }
1842 
1843 static const char* user_assertion_options[] = {
1844   "-da", "-ea", "-disableassertions", "-enableassertions", 0
1845 };
1846 
1847 static const char* system_assertion_options[] = {
1848   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1849 };
1850 
1851 // Return true if any of the strings in null-terminated array 'names' matches.
1852 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1853 // the option must match exactly.
1854 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1855   bool tail_allowed) {
1856   for (/* empty */; *names != NULL; ++names) {
1857     if (match_option(option, *names, tail)) {
1858       if (**tail == '\0' || tail_allowed && **tail == ':') {
1859         return true;
1860       }
1861     }
1862   }
1863   return false;
1864 }
1865 
1866 bool Arguments::parse_uintx(const char* value,
1867                             uintx* uintx_arg,
1868                             uintx min_size) {
1869 
1870   // Check the sign first since atomull() parses only unsigned values.
1871   bool value_is_positive = !(*value == '-');
1872 
1873   if (value_is_positive) {
1874     julong n;
1875     bool good_return = atomull(value, &n);
1876     if (good_return) {
1877       bool above_minimum = n >= min_size;
1878       bool value_is_too_large = n > max_uintx;
1879 
1880       if (above_minimum && !value_is_too_large) {
1881         *uintx_arg = n;
1882         return true;
1883       }
1884     }
1885   }
1886   return false;
1887 }
1888 
1889 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1890                                                   julong* long_arg,
1891                                                   julong min_size) {
1892   if (!atomull(s, long_arg)) return arg_unreadable;
1893   return check_memory_size(*long_arg, min_size);
1894 }
1895 
1896 // Parse JavaVMInitArgs structure
1897 
1898 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1899   // For components of the system classpath.
1900   SysClassPath scp(Arguments::get_sysclasspath());
1901   bool scp_assembly_required = false;
1902 
1903   // Save default settings for some mode flags
1904   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1905   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
1906   Arguments::_ClipInlining             = ClipInlining;
1907   Arguments::_BackgroundCompilation    = BackgroundCompilation;
1908   Arguments::_Tier2CompileThreshold    = Tier2CompileThreshold;
1909 
1910   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1911   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1912   if (result != JNI_OK) {
1913     return result;
1914   }
1915 
1916   // Parse JavaVMInitArgs structure passed in
1917   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1918   if (result != JNI_OK) {
1919     return result;
1920   }
1921 
1922   if (AggressiveOpts) {
1923     // Insert alt-rt.jar between user-specified bootclasspath
1924     // prefix and the default bootclasspath.  os::set_boot_path()
1925     // uses meta_index_dir as the default bootclasspath directory.
1926     const char* altclasses_jar = "alt-rt.jar";
1927     size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1928                                  strlen(altclasses_jar);
1929     char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1930     strcpy(altclasses_path, get_meta_index_dir());
1931     strcat(altclasses_path, altclasses_jar);
1932     scp.add_suffix_to_prefix(altclasses_path);
1933     scp_assembly_required = true;
1934     FREE_C_HEAP_ARRAY(char, altclasses_path);
1935   }
1936 
1937   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1938   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1939   if (result != JNI_OK) {
1940     return result;
1941   }
1942 
1943   // Do final processing now that all arguments have been parsed
1944   result = finalize_vm_init_args(&scp, scp_assembly_required);
1945   if (result != JNI_OK) {
1946     return result;
1947   }
1948 
1949   return JNI_OK;
1950 }
1951 
1952 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1953                                        SysClassPath* scp_p,
1954                                        bool* scp_assembly_required_p,
1955                                        FlagValueOrigin origin) {
1956   // Remaining part of option string
1957   const char* tail;
1958 
1959   // iterate over arguments
1960   for (int index = 0; index < args->nOptions; index++) {
1961     bool is_absolute_path = false;  // for -agentpath vs -agentlib
1962 
1963     const JavaVMOption* option = args->options + index;
1964 
1965     if (!match_option(option, "-Djava.class.path", &tail) &&
1966         !match_option(option, "-Dsun.java.command", &tail) &&
1967         !match_option(option, "-Dsun.java.launcher", &tail)) {
1968 
1969         // add all jvm options to the jvm_args string. This string
1970         // is used later to set the java.vm.args PerfData string constant.
1971         // the -Djava.class.path and the -Dsun.java.command options are
1972         // omitted from jvm_args string as each have their own PerfData
1973         // string constant object.
1974         build_jvm_args(option->optionString);
1975     }
1976 
1977     // -verbose:[class/gc/jni]
1978     if (match_option(option, "-verbose", &tail)) {
1979       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1980         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1981         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1982       } else if (!strcmp(tail, ":gc")) {
1983         FLAG_SET_CMDLINE(bool, PrintGC, true);
1984       } else if (!strcmp(tail, ":jni")) {
1985         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1986       }
1987     // -da / -ea / -disableassertions / -enableassertions
1988     // These accept an optional class/package name separated by a colon, e.g.,
1989     // -da:java.lang.Thread.
1990     } else if (match_option(option, user_assertion_options, &tail, true)) {
1991       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
1992       if (*tail == '\0') {
1993         JavaAssertions::setUserClassDefault(enable);
1994       } else {
1995         assert(*tail == ':', "bogus match by match_option()");
1996         JavaAssertions::addOption(tail + 1, enable);
1997       }
1998     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1999     } else if (match_option(option, system_assertion_options, &tail, false)) {
2000       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2001       JavaAssertions::setSystemClassDefault(enable);
2002     // -bootclasspath:
2003     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2004       scp_p->reset_path(tail);
2005       *scp_assembly_required_p = true;
2006     // -bootclasspath/a:
2007     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2008       scp_p->add_suffix(tail);
2009       *scp_assembly_required_p = true;
2010     // -bootclasspath/p:
2011     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2012       scp_p->add_prefix(tail);
2013       *scp_assembly_required_p = true;
2014     // -Xrun
2015     } else if (match_option(option, "-Xrun", &tail)) {
2016       if (tail != NULL) {
2017         const char* pos = strchr(tail, ':');
2018         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2019         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2020         name[len] = '\0';
2021 
2022         char *options = NULL;
2023         if(pos != NULL) {
2024           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2025           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2026         }
2027 #ifdef JVMTI_KERNEL
2028         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2029           warning("profiling and debugging agents are not supported with Kernel VM");
2030         } else
2031 #endif // JVMTI_KERNEL
2032         add_init_library(name, options);
2033       }
2034     // -agentlib and -agentpath
2035     } else if (match_option(option, "-agentlib:", &tail) ||
2036           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2037       if(tail != NULL) {
2038         const char* pos = strchr(tail, '=');
2039         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2040         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2041         name[len] = '\0';
2042 
2043         char *options = NULL;
2044         if(pos != NULL) {
2045           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2046         }
2047 #ifdef JVMTI_KERNEL
2048         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2049           warning("profiling and debugging agents are not supported with Kernel VM");
2050         } else
2051 #endif // JVMTI_KERNEL
2052         add_init_agent(name, options, is_absolute_path);
2053 
2054       }
2055     // -javaagent
2056     } else if (match_option(option, "-javaagent:", &tail)) {
2057       if(tail != NULL) {
2058         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2059         add_init_agent("instrument", options, false);
2060       }
2061     // -Xnoclassgc
2062     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2063       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2064     // -Xincgc: i-CMS
2065     } else if (match_option(option, "-Xincgc", &tail)) {
2066       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2067       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2068     // -Xnoincgc: no i-CMS
2069     } else if (match_option(option, "-Xnoincgc", &tail)) {
2070       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2071       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2072     // -Xconcgc
2073     } else if (match_option(option, "-Xconcgc", &tail)) {
2074       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2075     // -Xnoconcgc
2076     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2077       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2078     // -Xbatch
2079     } else if (match_option(option, "-Xbatch", &tail)) {
2080       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2081     // -Xmn for compatibility with other JVM vendors
2082     } else if (match_option(option, "-Xmn", &tail)) {
2083       julong long_initial_eden_size = 0;
2084       ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2085       if (errcode != arg_in_range) {
2086         jio_fprintf(defaultStream::error_stream(),
2087                     "Invalid initial eden size: %s\n", option->optionString);
2088         describe_range_error(errcode);
2089         return JNI_EINVAL;
2090       }
2091       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2092       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2093     // -Xms
2094     } else if (match_option(option, "-Xms", &tail)) {
2095       julong long_initial_heap_size = 0;
2096       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2097       if (errcode != arg_in_range) {
2098         jio_fprintf(defaultStream::error_stream(),
2099                     "Invalid initial heap size: %s\n", option->optionString);
2100         describe_range_error(errcode);
2101         return JNI_EINVAL;
2102       }
2103       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2104       // Currently the minimum size and the initial heap sizes are the same.
2105       set_min_heap_size(InitialHeapSize);
2106     // -Xmx
2107     } else if (match_option(option, "-Xmx", &tail)) {
2108       julong long_max_heap_size = 0;
2109       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2110       if (errcode != arg_in_range) {
2111         jio_fprintf(defaultStream::error_stream(),
2112                     "Invalid maximum heap size: %s\n", option->optionString);
2113         describe_range_error(errcode);
2114         return JNI_EINVAL;
2115       }
2116       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2117     // Xmaxf
2118     } else if (match_option(option, "-Xmaxf", &tail)) {
2119       int maxf = (int)(atof(tail) * 100);
2120       if (maxf < 0 || maxf > 100) {
2121         jio_fprintf(defaultStream::error_stream(),
2122                     "Bad max heap free percentage size: %s\n",
2123                     option->optionString);
2124         return JNI_EINVAL;
2125       } else {
2126         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2127       }
2128     // Xminf
2129     } else if (match_option(option, "-Xminf", &tail)) {
2130       int minf = (int)(atof(tail) * 100);
2131       if (minf < 0 || minf > 100) {
2132         jio_fprintf(defaultStream::error_stream(),
2133                     "Bad min heap free percentage size: %s\n",
2134                     option->optionString);
2135         return JNI_EINVAL;
2136       } else {
2137         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2138       }
2139     // -Xss
2140     } else if (match_option(option, "-Xss", &tail)) {
2141       julong long_ThreadStackSize = 0;
2142       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2143       if (errcode != arg_in_range) {
2144         jio_fprintf(defaultStream::error_stream(),
2145                     "Invalid thread stack size: %s\n", option->optionString);
2146         describe_range_error(errcode);
2147         return JNI_EINVAL;
2148       }
2149       // Internally track ThreadStackSize in units of 1024 bytes.
2150       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2151                               round_to((int)long_ThreadStackSize, K) / K);
2152     // -Xoss
2153     } else if (match_option(option, "-Xoss", &tail)) {
2154           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2155     // -Xmaxjitcodesize
2156     } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2157       julong long_ReservedCodeCacheSize = 0;
2158       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2159                                             (size_t)InitialCodeCacheSize);
2160       if (errcode != arg_in_range) {
2161         jio_fprintf(defaultStream::error_stream(),
2162                     "Invalid maximum code cache size: %s\n",
2163                     option->optionString);
2164         describe_range_error(errcode);
2165         return JNI_EINVAL;
2166       }
2167       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2168     // -green
2169     } else if (match_option(option, "-green", &tail)) {
2170       jio_fprintf(defaultStream::error_stream(),
2171                   "Green threads support not available\n");
2172           return JNI_EINVAL;
2173     // -native
2174     } else if (match_option(option, "-native", &tail)) {
2175           // HotSpot always uses native threads, ignore silently for compatibility
2176     // -Xsqnopause
2177     } else if (match_option(option, "-Xsqnopause", &tail)) {
2178           // EVM option, ignore silently for compatibility
2179     // -Xrs
2180     } else if (match_option(option, "-Xrs", &tail)) {
2181           // Classic/EVM option, new functionality
2182       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2183     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2184           // change default internal VM signals used - lower case for back compat
2185       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2186     // -Xoptimize
2187     } else if (match_option(option, "-Xoptimize", &tail)) {
2188           // EVM option, ignore silently for compatibility
2189     // -Xprof
2190     } else if (match_option(option, "-Xprof", &tail)) {
2191 #ifndef FPROF_KERNEL
2192       _has_profile = true;
2193 #else // FPROF_KERNEL
2194       // do we have to exit?
2195       warning("Kernel VM does not support flat profiling.");
2196 #endif // FPROF_KERNEL
2197     // -Xaprof
2198     } else if (match_option(option, "-Xaprof", &tail)) {
2199       _has_alloc_profile = true;
2200     // -Xconcurrentio
2201     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2202       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2203       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2204       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2205       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2206       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2207 
2208       // -Xinternalversion
2209     } else if (match_option(option, "-Xinternalversion", &tail)) {
2210       jio_fprintf(defaultStream::output_stream(), "%s\n",
2211                   VM_Version::internal_vm_info_string());
2212       vm_exit(0);
2213 #ifndef PRODUCT
2214     // -Xprintflags
2215     } else if (match_option(option, "-Xprintflags", &tail)) {
2216       CommandLineFlags::printFlags();
2217       vm_exit(0);
2218 #endif
2219     // -D
2220     } else if (match_option(option, "-D", &tail)) {
2221       if (!add_property(tail)) {
2222         return JNI_ENOMEM;
2223       }
2224       // Out of the box management support
2225       if (match_option(option, "-Dcom.sun.management", &tail)) {
2226         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2227       }
2228     // -Xint
2229     } else if (match_option(option, "-Xint", &tail)) {
2230           set_mode_flags(_int);
2231     // -Xmixed
2232     } else if (match_option(option, "-Xmixed", &tail)) {
2233           set_mode_flags(_mixed);
2234     // -Xcomp
2235     } else if (match_option(option, "-Xcomp", &tail)) {
2236       // for testing the compiler; turn off all flags that inhibit compilation
2237           set_mode_flags(_comp);
2238 
2239     // -Xshare:dump
2240     } else if (match_option(option, "-Xshare:dump", &tail)) {
2241 #ifdef TIERED
2242       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2243       set_mode_flags(_int);     // Prevent compilation, which creates objects
2244 #elif defined(COMPILER2)
2245       vm_exit_during_initialization(
2246           "Dumping a shared archive is not supported on the Server JVM.", NULL);
2247 #elif defined(KERNEL)
2248       vm_exit_during_initialization(
2249           "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2250 #else
2251       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2252       set_mode_flags(_int);     // Prevent compilation, which creates objects
2253 #endif
2254     // -Xshare:on
2255     } else if (match_option(option, "-Xshare:on", &tail)) {
2256       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2257       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2258 #ifdef TIERED
2259       FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2260 #endif // TIERED
2261     // -Xshare:auto
2262     } else if (match_option(option, "-Xshare:auto", &tail)) {
2263       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2264       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2265     // -Xshare:off
2266     } else if (match_option(option, "-Xshare:off", &tail)) {
2267       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2268       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2269 
2270     // -Xverify
2271     } else if (match_option(option, "-Xverify", &tail)) {
2272       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2273         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2274         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2275       } else if (strcmp(tail, ":remote") == 0) {
2276         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2277         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2278       } else if (strcmp(tail, ":none") == 0) {
2279         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2280         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2281       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2282         return JNI_EINVAL;
2283       }
2284     // -Xdebug
2285     } else if (match_option(option, "-Xdebug", &tail)) {
2286       // note this flag has been used, then ignore
2287       set_xdebug_mode(true);
2288     // -Xnoagent
2289     } else if (match_option(option, "-Xnoagent", &tail)) {
2290       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2291     } else if (match_option(option, "-Xboundthreads", &tail)) {
2292       // Bind user level threads to kernel threads (Solaris only)
2293       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2294     } else if (match_option(option, "-Xloggc:", &tail)) {
2295       // Redirect GC output to the file. -Xloggc:<filename>
2296       // ostream_init_log(), when called will use this filename
2297       // to initialize a fileStream.
2298       _gc_log_filename = strdup(tail);
2299       FLAG_SET_CMDLINE(bool, PrintGC, true);
2300       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2301       FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2302 
2303     // JNI hooks
2304     } else if (match_option(option, "-Xcheck", &tail)) {
2305       if (!strcmp(tail, ":jni")) {
2306         CheckJNICalls = true;
2307       } else if (is_bad_option(option, args->ignoreUnrecognized,
2308                                      "check")) {
2309         return JNI_EINVAL;
2310       }
2311     } else if (match_option(option, "vfprintf", &tail)) {
2312       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2313     } else if (match_option(option, "exit", &tail)) {
2314       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2315     } else if (match_option(option, "abort", &tail)) {
2316       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2317     // -XX:+AggressiveHeap
2318     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2319 
2320       // This option inspects the machine and attempts to set various
2321       // parameters to be optimal for long-running, memory allocation
2322       // intensive jobs.  It is intended for machines with large
2323       // amounts of cpu and memory.
2324 
2325       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2326       // VM, but we may not be able to represent the total physical memory
2327       // available (like having 8gb of memory on a box but using a 32bit VM).
2328       // Thus, we need to make sure we're using a julong for intermediate
2329       // calculations.
2330       julong initHeapSize;
2331       julong total_memory = os::physical_memory();
2332 
2333       if (total_memory < (julong)256*M) {
2334         jio_fprintf(defaultStream::error_stream(),
2335                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2336         vm_exit(1);
2337       }
2338 
2339       // The heap size is half of available memory, or (at most)
2340       // all of possible memory less 160mb (leaving room for the OS
2341       // when using ISM).  This is the maximum; because adaptive sizing
2342       // is turned on below, the actual space used may be smaller.
2343 
2344       initHeapSize = MIN2(total_memory / (julong)2,
2345                           total_memory - (julong)160*M);
2346 
2347       // Make sure that if we have a lot of memory we cap the 32 bit
2348       // process space.  The 64bit VM version of this function is a nop.
2349       initHeapSize = os::allocatable_physical_memory(initHeapSize);
2350 
2351       // The perm gen is separate but contiguous with the
2352       // object heap (and is reserved with it) so subtract it
2353       // from the heap size.
2354       if (initHeapSize > MaxPermSize) {
2355         initHeapSize = initHeapSize - MaxPermSize;
2356       } else {
2357         warning("AggressiveHeap and MaxPermSize values may conflict");
2358       }
2359 
2360       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2361          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2362          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2363          // Currently the minimum size and the initial heap sizes are the same.
2364          set_min_heap_size(initHeapSize);
2365       }
2366       if (FLAG_IS_DEFAULT(NewSize)) {
2367          // Make the young generation 3/8ths of the total heap.
2368          FLAG_SET_CMDLINE(uintx, NewSize,
2369                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2370          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2371       }
2372 
2373       FLAG_SET_DEFAULT(UseLargePages, true);
2374 
2375       // Increase some data structure sizes for efficiency
2376       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2377       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2378       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2379 
2380       // See the OldPLABSize comment below, but replace 'after promotion'
2381       // with 'after copying'.  YoungPLABSize is the size of the survivor
2382       // space per-gc-thread buffers.  The default is 4kw.
2383       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
2384 
2385       // OldPLABSize is the size of the buffers in the old gen that
2386       // UseParallelGC uses to promote live data that doesn't fit in the
2387       // survivor spaces.  At any given time, there's one for each gc thread.
2388       // The default size is 1kw. These buffers are rarely used, since the
2389       // survivor spaces are usually big enough.  For specjbb, however, there
2390       // are occasions when there's lots of live data in the young gen
2391       // and we end up promoting some of it.  We don't have a definite
2392       // explanation for why bumping OldPLABSize helps, but the theory
2393       // is that a bigger PLAB results in retaining something like the
2394       // original allocation order after promotion, which improves mutator
2395       // locality.  A minor effect may be that larger PLABs reduce the
2396       // number of PLAB allocation events during gc.  The value of 8kw
2397       // was arrived at by experimenting with specjbb.
2398       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
2399 
2400       // CompilationPolicyChoice=0 causes the server compiler to adopt
2401       // a more conservative which-method-do-I-compile policy when one
2402       // of the counters maintained by the interpreter trips.  The
2403       // result is reduced startup time and improved specjbb and
2404       // alacrity performance.  Zero is the default, but we set it
2405       // explicitly here in case the default changes.
2406       // See runtime/compilationPolicy.*.
2407       FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2408 
2409       // Enable parallel GC and adaptive generation sizing
2410       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2411       FLAG_SET_DEFAULT(ParallelGCThreads,
2412                        Abstract_VM_Version::parallel_worker_threads());
2413 
2414       // Encourage steady state memory management
2415       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2416 
2417       // This appears to improve mutator locality
2418       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2419 
2420       // Get around early Solaris scheduling bug
2421       // (affinity vs other jobs on system)
2422       // but disallow DR and offlining (5008695).
2423       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2424 
2425     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2426       // The last option must always win.
2427       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2428       FLAG_SET_CMDLINE(bool, NeverTenure, true);
2429     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2430       // The last option must always win.
2431       FLAG_SET_CMDLINE(bool, NeverTenure, false);
2432       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2433     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2434                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2435       jio_fprintf(defaultStream::error_stream(),
2436         "Please use CMSClassUnloadingEnabled in place of "
2437         "CMSPermGenSweepingEnabled in the future\n");
2438     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2439       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2440       jio_fprintf(defaultStream::error_stream(),
2441         "Please use -XX:+UseGCOverheadLimit in place of "
2442         "-XX:+UseGCTimeLimit in the future\n");
2443     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2444       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2445       jio_fprintf(defaultStream::error_stream(),
2446         "Please use -XX:-UseGCOverheadLimit in place of "
2447         "-XX:-UseGCTimeLimit in the future\n");
2448     // The TLE options are for compatibility with 1.3 and will be
2449     // removed without notice in a future release.  These options
2450     // are not to be documented.
2451     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2452       // No longer used.
2453     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2454       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2455     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2456       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2457     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2458       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2459     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2460       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2461     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2462       // No longer used.
2463     } else if (match_option(option, "-XX:TLESize=", &tail)) {
2464       julong long_tlab_size = 0;
2465       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2466       if (errcode != arg_in_range) {
2467         jio_fprintf(defaultStream::error_stream(),
2468                     "Invalid TLAB size: %s\n", option->optionString);
2469         describe_range_error(errcode);
2470         return JNI_EINVAL;
2471       }
2472       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2473     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2474       // No longer used.
2475     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2476       FLAG_SET_CMDLINE(bool, UseTLAB, true);
2477     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2478       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2479 SOLARIS_ONLY(
2480     } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2481       warning("-XX:+UsePermISM is obsolete.");
2482       FLAG_SET_CMDLINE(bool, UseISM, true);
2483     } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2484       FLAG_SET_CMDLINE(bool, UseISM, false);
2485 )
2486     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2487       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2488       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2489     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2490       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2491       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2492     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2493 #ifdef SOLARIS
2494       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2495       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2496       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2497       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2498 #else // ndef SOLARIS
2499       jio_fprintf(defaultStream::error_stream(),
2500                   "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2501       return JNI_EINVAL;
2502 #endif // ndef SOLARIS
2503 #ifdef ASSERT
2504     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2505       FLAG_SET_CMDLINE(bool, FullGCALot, true);
2506       // disable scavenge before parallel mark-compact
2507       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2508 #endif
2509     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2510       julong cms_blocks_to_claim = (julong)atol(tail);
2511       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2512       jio_fprintf(defaultStream::error_stream(),
2513         "Please use -XX:OldPLABSize in place of "
2514         "-XX:CMSParPromoteBlocksToClaim in the future\n");
2515     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2516       julong cms_blocks_to_claim = (julong)atol(tail);
2517       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2518       jio_fprintf(defaultStream::error_stream(),
2519         "Please use -XX:OldPLABSize in place of "
2520         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2521     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2522       julong old_plab_size = 0;
2523       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2524       if (errcode != arg_in_range) {
2525         jio_fprintf(defaultStream::error_stream(),
2526                     "Invalid old PLAB size: %s\n", option->optionString);
2527         describe_range_error(errcode);
2528         return JNI_EINVAL;
2529       }
2530       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2531       jio_fprintf(defaultStream::error_stream(),
2532                   "Please use -XX:OldPLABSize in place of "
2533                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2534     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2535       julong young_plab_size = 0;
2536       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2537       if (errcode != arg_in_range) {
2538         jio_fprintf(defaultStream::error_stream(),
2539                     "Invalid young PLAB size: %s\n", option->optionString);
2540         describe_range_error(errcode);
2541         return JNI_EINVAL;
2542       }
2543       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2544       jio_fprintf(defaultStream::error_stream(),
2545                   "Please use -XX:YoungPLABSize in place of "
2546                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2547     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2548                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2549       julong stack_size = 0;
2550       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2551       if (errcode != arg_in_range) {
2552         jio_fprintf(defaultStream::error_stream(),
2553                     "Invalid mark stack size: %s\n", option->optionString);
2554         describe_range_error(errcode);
2555         return JNI_EINVAL;
2556       }
2557       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2558     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2559       julong max_stack_size = 0;
2560       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2561       if (errcode != arg_in_range) {
2562         jio_fprintf(defaultStream::error_stream(),
2563                     "Invalid maximum mark stack size: %s\n",
2564                     option->optionString);
2565         describe_range_error(errcode);
2566         return JNI_EINVAL;
2567       }
2568       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2569     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2570                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2571       uintx conc_threads = 0;
2572       if (!parse_uintx(tail, &conc_threads, 1)) {
2573         jio_fprintf(defaultStream::error_stream(),
2574                     "Invalid concurrent threads: %s\n", option->optionString);
2575         return JNI_EINVAL;
2576       }
2577       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2578     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2579       // Skip -XX:Flags= since that case has already been handled
2580       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2581         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2582           return JNI_EINVAL;
2583         }
2584       }
2585     // Unknown option
2586     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2587       return JNI_ERR;
2588     }
2589   }
2590   // Change the default value for flags  which have different default values
2591   // when working with older JDKs.
2592   if (JDK_Version::current().compare_major(6) <= 0 &&
2593       FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2594     FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2595   }
2596 #ifdef LINUX
2597  if (JDK_Version::current().compare_major(6) <= 0 &&
2598       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2599     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2600   }
2601 #endif // LINUX
2602   return JNI_OK;
2603 }
2604 
2605 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2606   // This must be done after all -D arguments have been processed.
2607   scp_p->expand_endorsed();
2608 
2609   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2610     // Assemble the bootclasspath elements into the final path.
2611     Arguments::set_sysclasspath(scp_p->combined_path());
2612   }
2613 
2614   // This must be done after all arguments have been processed.
2615   // java_compiler() true means set to "NONE" or empty.
2616   if (java_compiler() && !xdebug_mode()) {
2617     // For backwards compatibility, we switch to interpreted mode if
2618     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2619     // not specified.
2620     set_mode_flags(_int);
2621   }
2622   if (CompileThreshold == 0) {
2623     set_mode_flags(_int);
2624   }
2625 
2626 #ifdef TIERED
2627   // If we are using tiered compilation in the tiered vm then c1 will
2628   // do the profiling and we don't want to waste that time in the
2629   // interpreter.
2630   if (TieredCompilation) {
2631     ProfileInterpreter = false;
2632   } else {
2633     // Since we are running vanilla server we must adjust the compile threshold
2634     // unless the user has already adjusted it because the default threshold assumes
2635     // we will run tiered.
2636 
2637     if (FLAG_IS_DEFAULT(CompileThreshold)) {
2638       CompileThreshold = Tier2CompileThreshold;
2639     }
2640   }
2641 #endif // TIERED
2642 
2643 #ifndef COMPILER2
2644   // Don't degrade server performance for footprint
2645   if (FLAG_IS_DEFAULT(UseLargePages) &&
2646       MaxHeapSize < LargePageHeapSizeThreshold) {
2647     // No need for large granularity pages w/small heaps.
2648     // Note that large pages are enabled/disabled for both the
2649     // Java heap and the code cache.
2650     FLAG_SET_DEFAULT(UseLargePages, false);
2651     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2652     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2653   }
2654 
2655   // Tiered compilation is undefined with C1.
2656   TieredCompilation = false;
2657 
2658 #else
2659   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2660     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2661   }
2662   // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2663   if (UseG1GC) {
2664     FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2665   }
2666 #endif
2667 
2668   // If we are running in a headless jre, force java.awt.headless property
2669   // to be true unless the property has already been set.
2670   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2671   if (os::is_headless_jre()) {
2672     const char* headless = Arguments::get_property("java.awt.headless");
2673     if (headless == NULL) {
2674       char envbuffer[128];
2675       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2676         if (!add_property("java.awt.headless=true")) {
2677           return JNI_ENOMEM;
2678         }
2679       } else {
2680         char buffer[256];
2681         strcpy(buffer, "java.awt.headless=");
2682         strcat(buffer, envbuffer);
2683         if (!add_property(buffer)) {
2684           return JNI_ENOMEM;
2685         }
2686       }
2687     }
2688   }
2689 
2690   if (!check_vm_args_consistency()) {
2691     return JNI_ERR;
2692   }
2693 
2694   return JNI_OK;
2695 }
2696 
2697 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2698   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2699                                             scp_assembly_required_p);
2700 }
2701 
2702 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2703   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2704                                             scp_assembly_required_p);
2705 }
2706 
2707 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2708   const int N_MAX_OPTIONS = 64;
2709   const int OPTION_BUFFER_SIZE = 1024;
2710   char buffer[OPTION_BUFFER_SIZE];
2711 
2712   // The variable will be ignored if it exceeds the length of the buffer.
2713   // Don't check this variable if user has special privileges
2714   // (e.g. unix su command).
2715   if (os::getenv(name, buffer, sizeof(buffer)) &&
2716       !os::have_special_privileges()) {
2717     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
2718     jio_fprintf(defaultStream::error_stream(),
2719                 "Picked up %s: %s\n", name, buffer);
2720     char* rd = buffer;                        // pointer to the input string (rd)
2721     int i;
2722     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
2723       while (isspace(*rd)) rd++;              // skip whitespace
2724       if (*rd == 0) break;                    // we re done when the input string is read completely
2725 
2726       // The output, option string, overwrites the input string.
2727       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2728       // input string (rd).
2729       char* wrt = rd;
2730 
2731       options[i++].optionString = wrt;        // Fill in option
2732       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
2733         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
2734           int quote = *rd;                    // matching quote to look for
2735           rd++;                               // don't copy open quote
2736           while (*rd != quote) {              // include everything (even spaces) up until quote
2737             if (*rd == 0) {                   // string termination means unmatched string
2738               jio_fprintf(defaultStream::error_stream(),
2739                           "Unmatched quote in %s\n", name);
2740               return JNI_ERR;
2741             }
2742             *wrt++ = *rd++;                   // copy to option string
2743           }
2744           rd++;                               // don't copy close quote
2745         } else {
2746           *wrt++ = *rd++;                     // copy to option string
2747         }
2748       }
2749       // Need to check if we're done before writing a NULL,
2750       // because the write could be to the byte that rd is pointing to.
2751       if (*rd++ == 0) {
2752         *wrt = 0;
2753         break;
2754       }
2755       *wrt = 0;                               // Zero terminate option
2756     }
2757     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2758     JavaVMInitArgs vm_args;
2759     vm_args.version = JNI_VERSION_1_2;
2760     vm_args.options = options;
2761     vm_args.nOptions = i;
2762     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2763 
2764     if (PrintVMOptions) {
2765       const char* tail;
2766       for (int i = 0; i < vm_args.nOptions; i++) {
2767         const JavaVMOption *option = vm_args.options + i;
2768         if (match_option(option, "-XX:", &tail)) {
2769           logOption(tail);
2770         }
2771       }
2772     }
2773 
2774     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2775   }
2776   return JNI_OK;
2777 }
2778 
2779 // Parse entry point called from JNI_CreateJavaVM
2780 
2781 jint Arguments::parse(const JavaVMInitArgs* args) {
2782 
2783   // Sharing support
2784   // Construct the path to the archive
2785   char jvm_path[JVM_MAXPATHLEN];
2786   os::jvm_path(jvm_path, sizeof(jvm_path));
2787 #ifdef TIERED
2788   if (strstr(jvm_path, "client") != NULL) {
2789     force_client_mode = true;
2790   }
2791 #endif // TIERED
2792   char *end = strrchr(jvm_path, *os::file_separator());
2793   if (end != NULL) *end = '\0';
2794   char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2795                                         strlen(os::file_separator()) + 20);
2796   if (shared_archive_path == NULL) return JNI_ENOMEM;
2797   strcpy(shared_archive_path, jvm_path);
2798   strcat(shared_archive_path, os::file_separator());
2799   strcat(shared_archive_path, "classes");
2800   DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2801   strcat(shared_archive_path, ".jsa");
2802   SharedArchivePath = shared_archive_path;
2803 
2804   // Remaining part of option string
2805   const char* tail;
2806 
2807   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2808   bool settings_file_specified = false;
2809   const char* flags_file;
2810   int index;
2811   for (index = 0; index < args->nOptions; index++) {
2812     const JavaVMOption *option = args->options + index;
2813     if (match_option(option, "-XX:Flags=", &tail)) {
2814       flags_file = tail;
2815       settings_file_specified = true;
2816     }
2817     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2818       PrintVMOptions = true;
2819     }
2820     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2821       PrintVMOptions = false;
2822     }
2823     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2824       IgnoreUnrecognizedVMOptions = true;
2825     }
2826     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2827       IgnoreUnrecognizedVMOptions = false;
2828     }
2829     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2830       CommandLineFlags::printFlags();
2831       vm_exit(0);
2832     }
2833 
2834 #ifndef PRODUCT
2835     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2836       CommandLineFlags::printFlags(true);
2837       vm_exit(0);
2838     }
2839 #endif
2840   }
2841 
2842   if (IgnoreUnrecognizedVMOptions) {
2843     // uncast const to modify the flag args->ignoreUnrecognized
2844     *(jboolean*)(&args->ignoreUnrecognized) = true;
2845   }
2846 
2847   // Parse specified settings file
2848   if (settings_file_specified) {
2849     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2850       return JNI_EINVAL;
2851     }
2852   }
2853 
2854   // Parse default .hotspotrc settings file
2855   if (!settings_file_specified) {
2856     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2857       return JNI_EINVAL;
2858     }
2859   }
2860 
2861   if (PrintVMOptions) {
2862     for (index = 0; index < args->nOptions; index++) {
2863       const JavaVMOption *option = args->options + index;
2864       if (match_option(option, "-XX:", &tail)) {
2865         logOption(tail);
2866       }
2867     }
2868   }
2869 
2870   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2871   jint result = parse_vm_init_args(args);
2872   if (result != JNI_OK) {
2873     return result;
2874   }
2875 
2876 #ifndef PRODUCT
2877   if (TraceBytecodesAt != 0) {
2878     TraceBytecodes = true;
2879   }
2880   if (CountCompiledCalls) {
2881     if (UseCounterDecay) {
2882       warning("UseCounterDecay disabled because CountCalls is set");
2883       UseCounterDecay = false;
2884     }
2885   }
2886 #endif // PRODUCT
2887 
2888   if (EnableInvokeDynamic && !EnableMethodHandles) {
2889     if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2890       warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2891     }
2892     EnableMethodHandles = true;
2893   }
2894   if (EnableMethodHandles && !AnonymousClasses) {
2895     if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2896       warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2897     }
2898     AnonymousClasses = true;
2899   }
2900   if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2901     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2902       warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2903     }
2904     ScavengeRootsInCode = 1;
2905   }
2906 #ifdef COMPILER2
2907   if (EnableInvokeDynamic && DoEscapeAnalysis) {
2908     // TODO: We need to find rules for invokedynamic and EA.  For now,
2909     // simply disable EA by default.
2910     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2911       DoEscapeAnalysis = false;
2912     }
2913   }
2914 #endif
2915 
2916   if (PrintGCDetails) {
2917     // Turn on -verbose:gc options as well
2918     PrintGC = true;
2919   }
2920 
2921 #if defined(_LP64) && defined(COMPILER1)
2922   UseCompressedOops = false;
2923 #endif
2924 
2925   // Set object alignment values.
2926   set_object_alignment();
2927 
2928 #ifdef SERIALGC
2929   force_serial_gc();
2930 #endif // SERIALGC
2931 #ifdef KERNEL
2932   no_shared_spaces();
2933 #endif // KERNEL
2934 
2935   // Set flags based on ergonomics.
2936   set_ergonomics_flags();
2937 
2938 #ifdef _LP64
2939   // XXX JSR 292 currently does not support compressed oops.
2940   if (EnableMethodHandles && UseCompressedOops) {
2941     if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) {
2942       UseCompressedOops = false;
2943     }
2944   }
2945 #endif // _LP64
2946 
2947   // Check the GC selections again.
2948   if (!check_gc_consistency()) {
2949     return JNI_EINVAL;
2950   }
2951 
2952 #ifndef KERNEL
2953   if (UseConcMarkSweepGC) {
2954     // Set flags for CMS and ParNew.  Check UseConcMarkSweep first
2955     // to ensure that when both UseConcMarkSweepGC and UseParNewGC
2956     // are true, we don't call set_parnew_gc_flags() as well.
2957     set_cms_and_parnew_gc_flags();
2958   } else {
2959     // Set heap size based on available physical memory
2960     set_heap_size();
2961     // Set per-collector flags
2962     if (UseParallelGC || UseParallelOldGC) {
2963       set_parallel_gc_flags();
2964     } else if (UseParNewGC) {
2965       set_parnew_gc_flags();
2966     } else if (UseG1GC) {
2967       set_g1_gc_flags();
2968     }
2969   }
2970 #endif // KERNEL
2971 
2972 #ifdef SERIALGC
2973   assert(verify_serial_gc_flags(), "SerialGC unset");
2974 #endif // SERIALGC
2975 
2976   // Set bytecode rewriting flags
2977   set_bytecode_flags();
2978 
2979   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2980   set_aggressive_opts_flags();
2981 
2982 #ifdef CC_INTERP
2983   // Clear flags not supported by the C++ interpreter
2984   FLAG_SET_DEFAULT(ProfileInterpreter, false);
2985   FLAG_SET_DEFAULT(UseBiasedLocking, false);
2986   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
2987 #endif // CC_INTERP
2988 
2989 #ifdef COMPILER2
2990   if (!UseBiasedLocking || EmitSync != 0) {
2991     UseOptoBiasInlining = false;
2992   }
2993 #endif
2994 
2995   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
2996     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
2997     DebugNonSafepoints = true;
2998   }
2999 
3000 #ifndef PRODUCT
3001   if (CompileTheWorld) {
3002     // Force NmethodSweeper to sweep whole CodeCache each time.
3003     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3004       NmethodSweepFraction = 1;
3005     }
3006   }
3007 #endif
3008 
3009   if (PrintCommandLineFlags) {
3010     CommandLineFlags::printSetFlags();
3011   }
3012 
3013   if (PrintFlagsFinal) {
3014     CommandLineFlags::printFlags();
3015   }
3016 
3017   // Apply CPU specific policy for the BiasedLocking
3018   if (UseBiasedLocking) {
3019     if (!VM_Version::use_biased_locking() &&
3020         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3021       UseBiasedLocking = false;
3022     }
3023   }
3024 
3025   return JNI_OK;
3026 }
3027 
3028 int Arguments::PropertyList_count(SystemProperty* pl) {
3029   int count = 0;
3030   while(pl != NULL) {
3031     count++;
3032     pl = pl->next();
3033   }
3034   return count;
3035 }
3036 
3037 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3038   assert(key != NULL, "just checking");
3039   SystemProperty* prop;
3040   for (prop = pl; prop != NULL; prop = prop->next()) {
3041     if (strcmp(key, prop->key()) == 0) return prop->value();
3042   }
3043   return NULL;
3044 }
3045 
3046 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3047   int count = 0;
3048   const char* ret_val = NULL;
3049 
3050   while(pl != NULL) {
3051     if(count >= index) {
3052       ret_val = pl->key();
3053       break;
3054     }
3055     count++;
3056     pl = pl->next();
3057   }
3058 
3059   return ret_val;
3060 }
3061 
3062 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3063   int count = 0;
3064   char* ret_val = NULL;
3065 
3066   while(pl != NULL) {
3067     if(count >= index) {
3068       ret_val = pl->value();
3069       break;
3070     }
3071     count++;
3072     pl = pl->next();
3073   }
3074 
3075   return ret_val;
3076 }
3077 
3078 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3079   SystemProperty* p = *plist;
3080   if (p == NULL) {
3081     *plist = new_p;
3082   } else {
3083     while (p->next() != NULL) {
3084       p = p->next();
3085     }
3086     p->set_next(new_p);
3087   }
3088 }
3089 
3090 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3091   if (plist == NULL)
3092     return;
3093 
3094   SystemProperty* new_p = new SystemProperty(k, v, true);
3095   PropertyList_add(plist, new_p);
3096 }
3097 
3098 // This add maintains unique property key in the list.
3099 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3100   if (plist == NULL)
3101     return;
3102 
3103   // If property key exist then update with new value.
3104   SystemProperty* prop;
3105   for (prop = *plist; prop != NULL; prop = prop->next()) {
3106     if (strcmp(k, prop->key()) == 0) {
3107       if (append) {
3108         prop->append_value(v);
3109       } else {
3110         prop->set_value(v);
3111       }
3112       return;
3113     }
3114   }
3115 
3116   PropertyList_add(plist, k, v);
3117 }
3118 
3119 #ifdef KERNEL
3120 char *Arguments::get_kernel_properties() {
3121   // Find properties starting with kernel and append them to string
3122   // We need to find out how long they are first because the URL's that they
3123   // might point to could get long.
3124   int length = 0;
3125   SystemProperty* prop;
3126   for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3127     if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3128       length += (strlen(prop->key()) + strlen(prop->value()) + 5);  // "-D ="
3129     }
3130   }
3131   // Add one for null terminator.
3132   char *props = AllocateHeap(length + 1, "get_kernel_properties");
3133   if (length != 0) {
3134     int pos = 0;
3135     for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3136       if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3137         jio_snprintf(&props[pos], length-pos,
3138                      "-D%s=%s ", prop->key(), prop->value());
3139         pos = strlen(props);
3140       }
3141     }
3142   }
3143   // null terminate props in case of null
3144   props[length] = '\0';
3145   return props;
3146 }
3147 #endif // KERNEL
3148 
3149 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3150 // Returns true if all of the source pointed by src has been copied over to
3151 // the destination buffer pointed by buf. Otherwise, returns false.
3152 // Notes:
3153 // 1. If the length (buflen) of the destination buffer excluding the
3154 // NULL terminator character is not long enough for holding the expanded
3155 // pid characters, it also returns false instead of returning the partially
3156 // expanded one.
3157 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3158 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3159                                 char* buf, size_t buflen) {
3160   const char* p = src;
3161   char* b = buf;
3162   const char* src_end = &src[srclen];
3163   char* buf_end = &buf[buflen - 1];
3164 
3165   while (p < src_end && b < buf_end) {
3166     if (*p == '%') {
3167       switch (*(++p)) {
3168       case '%':         // "%%" ==> "%"
3169         *b++ = *p++;
3170         break;
3171       case 'p':  {       //  "%p" ==> current process id
3172         // buf_end points to the character before the last character so
3173         // that we could write '\0' to the end of the buffer.
3174         size_t buf_sz = buf_end - b + 1;
3175         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3176 
3177         // if jio_snprintf fails or the buffer is not long enough to hold
3178         // the expanded pid, returns false.
3179         if (ret < 0 || ret >= (int)buf_sz) {
3180           return false;
3181         } else {
3182           b += ret;
3183           assert(*b == '\0', "fail in copy_expand_pid");
3184           if (p == src_end && b == buf_end + 1) {
3185             // reach the end of the buffer.
3186             return true;
3187           }
3188         }
3189         p++;
3190         break;
3191       }
3192       default :
3193         *b++ = '%';
3194       }
3195     } else {
3196       *b++ = *p++;
3197     }
3198   }
3199   *b = '\0';
3200   return (p == src_end); // return false if not all of the source was copied
3201 }