1 /*
   2  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any 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::_initial_heap_size            = 0;
  41 uintx  Arguments::_min_heap_size                = 0;
  42 Arguments::Mode Arguments::_mode                = _mixed;
  43 bool   Arguments::_java_compiler                = false;
  44 bool   Arguments::_xdebug_mode                  = false;
  45 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  46 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  47 int    Arguments::_sun_java_launcher_pid        = -1;
  48 
  49 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
  50 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  51 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  52 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  53 bool   Arguments::_ClipInlining                 = ClipInlining;
  54 intx   Arguments::_Tier2CompileThreshold        = Tier2CompileThreshold;
  55 
  56 char*  Arguments::SharedArchivePath             = NULL;
  57 
  58 AgentLibraryList Arguments::_libraryList;
  59 AgentLibraryList Arguments::_agentList;
  60 
  61 abort_hook_t     Arguments::_abort_hook         = NULL;
  62 exit_hook_t      Arguments::_exit_hook          = NULL;
  63 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
  64 
  65 
  66 SystemProperty *Arguments::_java_ext_dirs = NULL;
  67 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
  68 SystemProperty *Arguments::_sun_boot_library_path = NULL;
  69 SystemProperty *Arguments::_java_library_path = NULL;
  70 SystemProperty *Arguments::_java_home = NULL;
  71 SystemProperty *Arguments::_java_class_path = NULL;
  72 SystemProperty *Arguments::_sun_boot_class_path = NULL;
  73 
  74 char* Arguments::_meta_index_path = NULL;
  75 char* Arguments::_meta_index_dir = NULL;
  76 
  77 static bool force_client_mode = false;
  78 
  79 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
  80 
  81 static bool match_option(const JavaVMOption *option, const char* name,
  82                          const char** tail) {
  83   int len = (int)strlen(name);
  84   if (strncmp(option->optionString, name, len) == 0) {
  85     *tail = option->optionString + len;
  86     return true;
  87   } else {
  88     return false;
  89   }
  90 }
  91 
  92 static void logOption(const char* opt) {
  93   if (PrintVMOptions) {
  94     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
  95   }
  96 }
  97 
  98 // Process java launcher properties.
  99 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 100   // See if sun.java.launcher or sun.java.launcher.pid is defined.
 101   // Must do this before setting up other system properties,
 102   // as some of them may depend on launcher type.
 103   for (int index = 0; index < args->nOptions; index++) {
 104     const JavaVMOption* option = args->options + index;
 105     const char* tail;
 106 
 107     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 108       process_java_launcher_argument(tail, option->extraInfo);
 109       continue;
 110     }
 111     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 112       _sun_java_launcher_pid = atoi(tail);
 113       continue;
 114     }
 115   }
 116 }
 117 
 118 // Initialize system properties key and value.
 119 void Arguments::init_system_properties() {
 120 
 121   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
 122   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 123                                                                  "Java Virtual Machine Specification",  false));
 124   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
 125                                                                  "Sun Microsystems Inc.",  false));
 126   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 127   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 128   PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 129   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 130 
 131   // following are JVMTI agent writeable properties.
 132   // Properties values are set to NULL and they are
 133   // os specific they are initialized in os::init_system_properties_values().
 134   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 135   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 136   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 137   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 138   _java_home =  new SystemProperty("java.home", NULL,  true);
 139   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 140 
 141   _java_class_path = new SystemProperty("java.class.path", "",  true);
 142 
 143   // Add to System Property list.
 144   PropertyList_add(&_system_properties, _java_ext_dirs);
 145   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 146   PropertyList_add(&_system_properties, _sun_boot_library_path);
 147   PropertyList_add(&_system_properties, _java_library_path);
 148   PropertyList_add(&_system_properties, _java_home);
 149   PropertyList_add(&_system_properties, _java_class_path);
 150   PropertyList_add(&_system_properties, _sun_boot_class_path);
 151 
 152   // Set OS specific system properties values
 153   os::init_system_properties_values();
 154 }
 155 
 156 /**
 157  * Provide a slightly more user-friendly way of eliminating -XX flags.
 158  * When a flag is eliminated, it can be added to this list in order to
 159  * continue accepting this flag on the command-line, while issuing a warning
 160  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 161  * limit, we flatly refuse to admit the existence of the flag.  This allows
 162  * a flag to die correctly over JDK releases using HSX.
 163  */
 164 typedef struct {
 165   const char* name;
 166   JDK_Version obsoleted_in; // when the flag went away
 167   JDK_Version accept_until; // which version to start denying the existence
 168 } ObsoleteFlag;
 169 
 170 static ObsoleteFlag obsolete_jvm_flags[] = {
 171   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 172   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 173   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 174   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 175   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 176   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 177   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 178   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 179   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 180   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 181   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 182   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 183   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 184   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 185   { NULL, JDK_Version(0), JDK_Version(0) }
 186 };
 187 
 188 // Returns true if the flag is obsolete and fits into the range specified
 189 // for being ignored.  In the case that the flag is ignored, the 'version'
 190 // value is filled in with the version number when the flag became
 191 // obsolete so that that value can be displayed to the user.
 192 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 193   int i = 0;
 194   assert(version != NULL, "Must provide a version buffer");
 195   while (obsolete_jvm_flags[i].name != NULL) {
 196     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 197     // <flag>=xxx form
 198     // [-|+]<flag> form
 199     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 200         ((s[0] == '+' || s[0] == '-') &&
 201         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 202       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 203           *version = flag_status.obsoleted_in;
 204           return true;
 205       }
 206     }
 207     i++;
 208   }
 209   return false;
 210 }
 211 
 212 // Constructs the system class path (aka boot class path) from the following
 213 // components, in order:
 214 //
 215 //     prefix           // from -Xbootclasspath/p:...
 216 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 217 //     base             // from os::get_system_properties() or -Xbootclasspath=
 218 //     suffix           // from -Xbootclasspath/a:...
 219 //
 220 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 221 // directories are added to the sysclasspath just before the base.
 222 //
 223 // This could be AllStatic, but it isn't needed after argument processing is
 224 // complete.
 225 class SysClassPath: public StackObj {
 226 public:
 227   SysClassPath(const char* base);
 228   ~SysClassPath();
 229 
 230   inline void set_base(const char* base);
 231   inline void add_prefix(const char* prefix);
 232   inline void add_suffix_to_prefix(const char* suffix);
 233   inline void add_suffix(const char* suffix);
 234   inline void reset_path(const char* base);
 235 
 236   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 237   // property.  Must be called after all command-line arguments have been
 238   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 239   // combined_path().
 240   void expand_endorsed();
 241 
 242   inline const char* get_base()     const { return _items[_scp_base]; }
 243   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 244   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 245   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 246 
 247   // Combine all the components into a single c-heap-allocated string; caller
 248   // must free the string if/when no longer needed.
 249   char* combined_path();
 250 
 251 private:
 252   // Utility routines.
 253   static char* add_to_path(const char* path, const char* str, bool prepend);
 254   static char* add_jars_to_path(char* path, const char* directory);
 255 
 256   inline void reset_item_at(int index);
 257 
 258   // Array indices for the items that make up the sysclasspath.  All except the
 259   // base are allocated in the C heap and freed by this class.
 260   enum {
 261     _scp_prefix,        // from -Xbootclasspath/p:...
 262     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 263     _scp_base,          // the default sysclasspath
 264     _scp_suffix,        // from -Xbootclasspath/a:...
 265     _scp_nitems         // the number of items, must be last.
 266   };
 267 
 268   const char* _items[_scp_nitems];
 269   DEBUG_ONLY(bool _expansion_done;)
 270 };
 271 
 272 SysClassPath::SysClassPath(const char* base) {
 273   memset(_items, 0, sizeof(_items));
 274   _items[_scp_base] = base;
 275   DEBUG_ONLY(_expansion_done = false;)
 276 }
 277 
 278 SysClassPath::~SysClassPath() {
 279   // Free everything except the base.
 280   for (int i = 0; i < _scp_nitems; ++i) {
 281     if (i != _scp_base) reset_item_at(i);
 282   }
 283   DEBUG_ONLY(_expansion_done = false;)
 284 }
 285 
 286 inline void SysClassPath::set_base(const char* base) {
 287   _items[_scp_base] = base;
 288 }
 289 
 290 inline void SysClassPath::add_prefix(const char* prefix) {
 291   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 292 }
 293 
 294 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 295   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 296 }
 297 
 298 inline void SysClassPath::add_suffix(const char* suffix) {
 299   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 300 }
 301 
 302 inline void SysClassPath::reset_item_at(int index) {
 303   assert(index < _scp_nitems && index != _scp_base, "just checking");
 304   if (_items[index] != NULL) {
 305     FREE_C_HEAP_ARRAY(char, _items[index]);
 306     _items[index] = NULL;
 307   }
 308 }
 309 
 310 inline void SysClassPath::reset_path(const char* base) {
 311   // Clear the prefix and suffix.
 312   reset_item_at(_scp_prefix);
 313   reset_item_at(_scp_suffix);
 314   set_base(base);
 315 }
 316 
 317 //------------------------------------------------------------------------------
 318 
 319 void SysClassPath::expand_endorsed() {
 320   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 321 
 322   const char* path = Arguments::get_property("java.endorsed.dirs");
 323   if (path == NULL) {
 324     path = Arguments::get_endorsed_dir();
 325     assert(path != NULL, "no default for java.endorsed.dirs");
 326   }
 327 
 328   char* expanded_path = NULL;
 329   const char separator = *os::path_separator();
 330   const char* const end = path + strlen(path);
 331   while (path < end) {
 332     const char* tmp_end = strchr(path, separator);
 333     if (tmp_end == NULL) {
 334       expanded_path = add_jars_to_path(expanded_path, path);
 335       path = end;
 336     } else {
 337       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
 338       memcpy(dirpath, path, tmp_end - path);
 339       dirpath[tmp_end - path] = '\0';
 340       expanded_path = add_jars_to_path(expanded_path, dirpath);
 341       FREE_C_HEAP_ARRAY(char, dirpath);
 342       path = tmp_end + 1;
 343     }
 344   }
 345   _items[_scp_endorsed] = expanded_path;
 346   DEBUG_ONLY(_expansion_done = true;)
 347 }
 348 
 349 // Combine the bootclasspath elements, some of which may be null, into a single
 350 // c-heap-allocated string.
 351 char* SysClassPath::combined_path() {
 352   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 353   assert(_expansion_done, "must call expand_endorsed() first.");
 354 
 355   size_t lengths[_scp_nitems];
 356   size_t total_len = 0;
 357 
 358   const char separator = *os::path_separator();
 359 
 360   // Get the lengths.
 361   int i;
 362   for (i = 0; i < _scp_nitems; ++i) {
 363     if (_items[i] != NULL) {
 364       lengths[i] = strlen(_items[i]);
 365       // Include space for the separator char (or a NULL for the last item).
 366       total_len += lengths[i] + 1;
 367     }
 368   }
 369   assert(total_len > 0, "empty sysclasspath not allowed");
 370 
 371   // Copy the _items to a single string.
 372   char* cp = NEW_C_HEAP_ARRAY(char, total_len);
 373   char* cp_tmp = cp;
 374   for (i = 0; i < _scp_nitems; ++i) {
 375     if (_items[i] != NULL) {
 376       memcpy(cp_tmp, _items[i], lengths[i]);
 377       cp_tmp += lengths[i];
 378       *cp_tmp++ = separator;
 379     }
 380   }
 381   *--cp_tmp = '\0';     // Replace the extra separator.
 382   return cp;
 383 }
 384 
 385 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 386 char*
 387 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 388   char *cp;
 389 
 390   assert(str != NULL, "just checking");
 391   if (path == NULL) {
 392     size_t len = strlen(str) + 1;
 393     cp = NEW_C_HEAP_ARRAY(char, len);
 394     memcpy(cp, str, len);                       // copy the trailing null
 395   } else {
 396     const char separator = *os::path_separator();
 397     size_t old_len = strlen(path);
 398     size_t str_len = strlen(str);
 399     size_t len = old_len + str_len + 2;
 400 
 401     if (prepend) {
 402       cp = NEW_C_HEAP_ARRAY(char, len);
 403       char* cp_tmp = cp;
 404       memcpy(cp_tmp, str, str_len);
 405       cp_tmp += str_len;
 406       *cp_tmp = separator;
 407       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 408       FREE_C_HEAP_ARRAY(char, path);
 409     } else {
 410       cp = REALLOC_C_HEAP_ARRAY(char, path, len);
 411       char* cp_tmp = cp + old_len;
 412       *cp_tmp = separator;
 413       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 414     }
 415   }
 416   return cp;
 417 }
 418 
 419 // Scan the directory and append any jar or zip files found to path.
 420 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 421 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 422   DIR* dir = os::opendir(directory);
 423   if (dir == NULL) return path;
 424 
 425   char dir_sep[2] = { '\0', '\0' };
 426   size_t directory_len = strlen(directory);
 427   const char fileSep = *os::file_separator();
 428   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 429 
 430   /* Scan the directory for jars/zips, appending them to path. */
 431   struct dirent *entry;
 432   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
 433   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 434     const char* name = entry->d_name;
 435     const char* ext = name + strlen(name) - 4;
 436     bool isJarOrZip = ext > name &&
 437       (os::file_name_strcmp(ext, ".jar") == 0 ||
 438        os::file_name_strcmp(ext, ".zip") == 0);
 439     if (isJarOrZip) {
 440       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
 441       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 442       path = add_to_path(path, jarpath, false);
 443       FREE_C_HEAP_ARRAY(char, jarpath);
 444     }
 445   }
 446   FREE_C_HEAP_ARRAY(char, dbuf);
 447   os::closedir(dir);
 448   return path;
 449 }
 450 
 451 // Parses a memory size specification string.
 452 static bool atomull(const char *s, julong* result) {
 453   julong n = 0;
 454   int args_read = sscanf(s, os::julong_format_specifier(), &n);
 455   if (args_read != 1) {
 456     return false;
 457   }
 458   while (*s != '\0' && isdigit(*s)) {
 459     s++;
 460   }
 461   // 4705540: illegal if more characters are found after the first non-digit
 462   if (strlen(s) > 1) {
 463     return false;
 464   }
 465   switch (*s) {
 466     case 'T': case 't':
 467       *result = n * G * K;
 468       // Check for overflow.
 469       if (*result/((julong)G * K) != n) return false;
 470       return true;
 471     case 'G': case 'g':
 472       *result = n * G;
 473       if (*result/G != n) return false;
 474       return true;
 475     case 'M': case 'm':
 476       *result = n * M;
 477       if (*result/M != n) return false;
 478       return true;
 479     case 'K': case 'k':
 480       *result = n * K;
 481       if (*result/K != n) return false;
 482       return true;
 483     case '\0':
 484       *result = n;
 485       return true;
 486     default:
 487       return false;
 488   }
 489 }
 490 
 491 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 492   if (size < min_size) return arg_too_small;
 493   // Check that size will fit in a size_t (only relevant on 32-bit)
 494   if (size > max_uintx) return arg_too_big;
 495   return arg_in_range;
 496 }
 497 
 498 // Describe an argument out of range error
 499 void Arguments::describe_range_error(ArgsRange errcode) {
 500   switch(errcode) {
 501   case arg_too_big:
 502     jio_fprintf(defaultStream::error_stream(),
 503                 "The specified size exceeds the maximum "
 504                 "representable size.\n");
 505     break;
 506   case arg_too_small:
 507   case arg_unreadable:
 508   case arg_in_range:
 509     // do nothing for now
 510     break;
 511   default:
 512     ShouldNotReachHere();
 513   }
 514 }
 515 
 516 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
 517   return CommandLineFlags::boolAtPut(name, &value, origin);
 518 }
 519 
 520 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
 521   double v;
 522   if (sscanf(value, "%lf", &v) != 1) {
 523     return false;
 524   }
 525 
 526   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 527     return true;
 528   }
 529   return false;
 530 }
 531 
 532 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
 533   julong v;
 534   intx intx_v;
 535   bool is_neg = false;
 536   // Check the sign first since atomull() parses only unsigned values.
 537   if (*value == '-') {
 538     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 539       return false;
 540     }
 541     value++;
 542     is_neg = true;
 543   }
 544   if (!atomull(value, &v)) {
 545     return false;
 546   }
 547   intx_v = (intx) v;
 548   if (is_neg) {
 549     intx_v = -intx_v;
 550   }
 551   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 552     return true;
 553   }
 554   uintx uintx_v = (uintx) v;
 555   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 556     return true;
 557   }
 558   return false;
 559 }
 560 
 561 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
 562   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 563   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 564   FREE_C_HEAP_ARRAY(char, value);
 565   return true;
 566 }
 567 
 568 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
 569   const char* old_value = "";
 570   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 571   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 572   size_t new_len = strlen(new_value);
 573   const char* value;
 574   char* free_this_too = NULL;
 575   if (old_len == 0) {
 576     value = new_value;
 577   } else if (new_len == 0) {
 578     value = old_value;
 579   } else {
 580     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
 581     // each new setting adds another LINE to the switch:
 582     sprintf(buf, "%s\n%s", old_value, new_value);
 583     value = buf;
 584     free_this_too = buf;
 585   }
 586   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 587   // CommandLineFlags always returns a pointer that needs freeing.
 588   FREE_C_HEAP_ARRAY(char, value);
 589   if (free_this_too != NULL) {
 590     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 591     FREE_C_HEAP_ARRAY(char, free_this_too);
 592   }
 593   return true;
 594 }
 595 
 596 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
 597 
 598   // range of acceptable characters spelled out for portability reasons
 599 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 600 #define BUFLEN 255
 601   char name[BUFLEN+1];
 602   char dummy;
 603 
 604   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 605     return set_bool_flag(name, false, origin);
 606   }
 607   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 608     return set_bool_flag(name, true, origin);
 609   }
 610 
 611   char punct;
 612   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 613     const char* value = strchr(arg, '=') + 1;
 614     Flag* flag = Flag::find_flag(name, strlen(name));
 615     if (flag != NULL && flag->is_ccstr()) {
 616       if (flag->ccstr_accumulates()) {
 617         return append_to_string_flag(name, value, origin);
 618       } else {
 619         if (value[0] == '\0') {
 620           value = NULL;
 621         }
 622         return set_string_flag(name, value, origin);
 623       }
 624     }
 625   }
 626 
 627   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 628     const char* value = strchr(arg, '=') + 1;
 629     // -XX:Foo:=xxx will reset the string flag to the given value.
 630     if (value[0] == '\0') {
 631       value = NULL;
 632     }
 633     return set_string_flag(name, value, origin);
 634   }
 635 
 636 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 637 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 638 #define        NUMBER_RANGE    "[0123456789]"
 639   char value[BUFLEN + 1];
 640   char value2[BUFLEN + 1];
 641   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 642     // Looks like a floating-point number -- try again with more lenient format string
 643     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 644       return set_fp_numeric_flag(name, value, origin);
 645     }
 646   }
 647 
 648 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 649   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 650     return set_numeric_flag(name, value, origin);
 651   }
 652 
 653   return false;
 654 }
 655 
 656 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 657   assert(bldarray != NULL, "illegal argument");
 658 
 659   if (arg == NULL) {
 660     return;
 661   }
 662 
 663   int index = *count;
 664 
 665   // expand the array and add arg to the last element
 666   (*count)++;
 667   if (*bldarray == NULL) {
 668     *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
 669   } else {
 670     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
 671   }
 672   (*bldarray)[index] = strdup(arg);
 673 }
 674 
 675 void Arguments::build_jvm_args(const char* arg) {
 676   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 677 }
 678 
 679 void Arguments::build_jvm_flags(const char* arg) {
 680   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 681 }
 682 
 683 // utility function to return a string that concatenates all
 684 // strings in a given char** array
 685 const char* Arguments::build_resource_string(char** args, int count) {
 686   if (args == NULL || count == 0) {
 687     return NULL;
 688   }
 689   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 690   for (int i = 1; i < count; i++) {
 691     length += strlen(args[i]) + 1; // add 1 for a space
 692   }
 693   char* s = NEW_RESOURCE_ARRAY(char, length);
 694   strcpy(s, args[0]);
 695   for (int j = 1; j < count; j++) {
 696     strcat(s, " ");
 697     strcat(s, args[j]);
 698   }
 699   return (const char*) s;
 700 }
 701 
 702 void Arguments::print_on(outputStream* st) {
 703   st->print_cr("VM Arguments:");
 704   if (num_jvm_flags() > 0) {
 705     st->print("jvm_flags: "); print_jvm_flags_on(st);
 706   }
 707   if (num_jvm_args() > 0) {
 708     st->print("jvm_args: "); print_jvm_args_on(st);
 709   }
 710   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 711   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 712 }
 713 
 714 void Arguments::print_jvm_flags_on(outputStream* st) {
 715   if (_num_jvm_flags > 0) {
 716     for (int i=0; i < _num_jvm_flags; i++) {
 717       st->print("%s ", _jvm_flags_array[i]);
 718     }
 719     st->print_cr("");
 720   }
 721 }
 722 
 723 void Arguments::print_jvm_args_on(outputStream* st) {
 724   if (_num_jvm_args > 0) {
 725     for (int i=0; i < _num_jvm_args; i++) {
 726       st->print("%s ", _jvm_args_array[i]);
 727     }
 728     st->print_cr("");
 729   }
 730 }
 731 
 732 bool Arguments::process_argument(const char* arg,
 733     jboolean ignore_unrecognized, FlagValueOrigin origin) {
 734 
 735   JDK_Version since = JDK_Version();
 736 
 737   if (parse_argument(arg, origin)) {
 738     // do nothing
 739   } else if (is_newly_obsolete(arg, &since)) {
 740     enum { bufsize = 256 };
 741     char buffer[bufsize];
 742     since.to_string(buffer, bufsize);
 743     jio_fprintf(defaultStream::error_stream(),
 744       "Warning: The flag %s has been EOL'd as of %s and will"
 745       " be ignored\n", arg, buffer);
 746   } else {
 747     if (!ignore_unrecognized) {
 748       jio_fprintf(defaultStream::error_stream(),
 749                   "Unrecognized VM option '%s'\n", arg);
 750       // allow for commandline "commenting out" options like -XX:#+Verbose
 751       if (strlen(arg) == 0 || arg[0] != '#') {
 752         return false;
 753       }
 754     }
 755   }
 756   return true;
 757 }
 758 
 759 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 760   FILE* stream = fopen(file_name, "rb");
 761   if (stream == NULL) {
 762     if (should_exist) {
 763       jio_fprintf(defaultStream::error_stream(),
 764                   "Could not open settings file %s\n", file_name);
 765       return false;
 766     } else {
 767       return true;
 768     }
 769   }
 770 
 771   char token[1024];
 772   int  pos = 0;
 773 
 774   bool in_white_space = true;
 775   bool in_comment     = false;
 776   bool in_quote       = false;
 777   char quote_c        = 0;
 778   bool result         = true;
 779 
 780   int c = getc(stream);
 781   while(c != EOF) {
 782     if (in_white_space) {
 783       if (in_comment) {
 784         if (c == '\n') in_comment = false;
 785       } else {
 786         if (c == '#') in_comment = true;
 787         else if (!isspace(c)) {
 788           in_white_space = false;
 789           token[pos++] = c;
 790         }
 791       }
 792     } else {
 793       if (c == '\n' || (!in_quote && isspace(c))) {
 794         // token ends at newline, or at unquoted whitespace
 795         // this allows a way to include spaces in string-valued options
 796         token[pos] = '\0';
 797         logOption(token);
 798         result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
 799         build_jvm_flags(token);
 800         pos = 0;
 801         in_white_space = true;
 802         in_quote = false;
 803       } else if (!in_quote && (c == '\'' || c == '"')) {
 804         in_quote = true;
 805         quote_c = c;
 806       } else if (in_quote && (c == quote_c)) {
 807         in_quote = false;
 808       } else {
 809         token[pos++] = c;
 810       }
 811     }
 812     c = getc(stream);
 813   }
 814   if (pos > 0) {
 815     token[pos] = '\0';
 816     result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
 817     build_jvm_flags(token);
 818   }
 819   fclose(stream);
 820   return result;
 821 }
 822 
 823 //=============================================================================================================
 824 // Parsing of properties (-D)
 825 
 826 const char* Arguments::get_property(const char* key) {
 827   return PropertyList_get_value(system_properties(), key);
 828 }
 829 
 830 bool Arguments::add_property(const char* prop) {
 831   const char* eq = strchr(prop, '=');
 832   char* key;
 833   // ns must be static--its address may be stored in a SystemProperty object.
 834   const static char ns[1] = {0};
 835   char* value = (char *)ns;
 836 
 837   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
 838   key = AllocateHeap(key_len + 1, "add_property");
 839   strncpy(key, prop, key_len);
 840   key[key_len] = '\0';
 841 
 842   if (eq != NULL) {
 843     size_t value_len = strlen(prop) - key_len - 1;
 844     value = AllocateHeap(value_len + 1, "add_property");
 845     strncpy(value, &prop[key_len + 1], value_len + 1);
 846   }
 847 
 848   if (strcmp(key, "java.compiler") == 0) {
 849     process_java_compiler_argument(value);
 850     FreeHeap(key);
 851     if (eq != NULL) {
 852       FreeHeap(value);
 853     }
 854     return true;
 855   } else if (strcmp(key, "sun.java.command") == 0) {
 856     _java_command = value;
 857 
 858     // don't add this property to the properties exposed to the java application
 859     FreeHeap(key);
 860     return true;
 861   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
 862     // launcher.pid property is private and is processed
 863     // in process_sun_java_launcher_properties();
 864     // the sun.java.launcher property is passed on to the java application
 865     FreeHeap(key);
 866     if (eq != NULL) {
 867       FreeHeap(value);
 868     }
 869     return true;
 870   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
 871     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
 872     // its value without going through the property list or making a Java call.
 873     _java_vendor_url_bug = value;
 874   } else if (strcmp(key, "sun.boot.library.path") == 0) {
 875     PropertyList_unique_add(&_system_properties, key, value, true);
 876     return true;
 877   }
 878   // Create new property and add at the end of the list
 879   PropertyList_unique_add(&_system_properties, key, value);
 880   return true;
 881 }
 882 
 883 //===========================================================================================================
 884 // Setting int/mixed/comp mode flags
 885 
 886 void Arguments::set_mode_flags(Mode mode) {
 887   // Set up default values for all flags.
 888   // If you add a flag to any of the branches below,
 889   // add a default value for it here.
 890   set_java_compiler(false);
 891   _mode                      = mode;
 892 
 893   // Ensure Agent_OnLoad has the correct initial values.
 894   // This may not be the final mode; mode may change later in onload phase.
 895   PropertyList_unique_add(&_system_properties, "java.vm.info",
 896                           (char*)Abstract_VM_Version::vm_info_string(), false);
 897 
 898   UseInterpreter             = true;
 899   UseCompiler                = true;
 900   UseLoopCounter             = true;
 901 
 902   // Default values may be platform/compiler dependent -
 903   // use the saved values
 904   ClipInlining               = Arguments::_ClipInlining;
 905   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
 906   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
 907   BackgroundCompilation      = Arguments::_BackgroundCompilation;
 908   Tier2CompileThreshold      = Arguments::_Tier2CompileThreshold;
 909 
 910   // Change from defaults based on mode
 911   switch (mode) {
 912   default:
 913     ShouldNotReachHere();
 914     break;
 915   case _int:
 916     UseCompiler              = false;
 917     UseLoopCounter           = false;
 918     AlwaysCompileLoopMethods = false;
 919     UseOnStackReplacement    = false;
 920     break;
 921   case _mixed:
 922     // same as default
 923     break;
 924   case _comp:
 925     UseInterpreter           = false;
 926     BackgroundCompilation    = false;
 927     ClipInlining             = false;
 928     break;
 929   }
 930 }
 931 
 932 // Conflict: required to use shared spaces (-Xshare:on), but
 933 // incompatible command line options were chosen.
 934 
 935 static void no_shared_spaces() {
 936   if (RequireSharedSpaces) {
 937     jio_fprintf(defaultStream::error_stream(),
 938       "Class data sharing is inconsistent with other specified options.\n");
 939     vm_exit_during_initialization("Unable to use shared archive.", NULL);
 940   } else {
 941     FLAG_SET_DEFAULT(UseSharedSpaces, false);
 942   }
 943 }
 944 
 945 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
 946 // if it's not explictly set or unset. If the user has chosen
 947 // UseParNewGC and not explicitly set ParallelGCThreads we
 948 // set it, unless this is a single cpu machine.
 949 void Arguments::set_parnew_gc_flags() {
 950   assert(!UseSerialGC && !UseParallelGC && !UseG1GC,
 951          "control point invariant");
 952   assert(UseParNewGC, "Error");
 953 
 954   // Turn off AdaptiveSizePolicy by default for parnew until it is
 955   // complete.
 956   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
 957     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
 958   }
 959 
 960   if (ParallelGCThreads == 0) {
 961     FLAG_SET_DEFAULT(ParallelGCThreads,
 962                      Abstract_VM_Version::parallel_worker_threads());
 963     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
 964       FLAG_SET_DEFAULT(UseParNewGC, false);
 965     }
 966   }
 967   if (!UseParNewGC) {
 968     FLAG_SET_DEFAULT(ParallelGCThreads, 0);
 969   } else {
 970     no_shared_spaces();
 971 
 972     // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
 973     // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
 974     // we set them to 1024 and 1024.
 975     // See CR 6362902.
 976     if (FLAG_IS_DEFAULT(YoungPLABSize)) {
 977       FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
 978     }
 979     if (FLAG_IS_DEFAULT(OldPLABSize)) {
 980       FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
 981     }
 982 
 983     // AlwaysTenure flag should make ParNew to promote all at first collection.
 984     // See CR 6362902.
 985     if (AlwaysTenure) {
 986       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
 987     }
 988     // When using compressed oops, we use local overflow stacks,
 989     // rather than using a global overflow list chained through
 990     // the klass word of the object's pre-image.
 991     if (UseCompressedOops && !ParGCUseLocalOverflow) {
 992       if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
 993         warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
 994       }
 995       FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
 996     }
 997     assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
 998   }
 999 }
1000 
1001 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1002 // sparc/solaris for certain applications, but would gain from
1003 // further optimization and tuning efforts, and would almost
1004 // certainly gain from analysis of platform and environment.
1005 void Arguments::set_cms_and_parnew_gc_flags() {
1006   assert(!UseSerialGC && !UseParallelGC, "Error");
1007   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1008 
1009   // If we are using CMS, we prefer to UseParNewGC,
1010   // unless explicitly forbidden.
1011   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1012     FLAG_SET_ERGO(bool, UseParNewGC, true);
1013   }
1014 
1015   // Turn off AdaptiveSizePolicy by default for cms until it is
1016   // complete.
1017   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1018     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1019   }
1020 
1021   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1022   // as needed.
1023   if (UseParNewGC) {
1024     set_parnew_gc_flags();
1025   }
1026 
1027   // Now make adjustments for CMS
1028   size_t young_gen_per_worker;
1029   intx new_ratio;
1030   size_t min_new_default;
1031   intx tenuring_default;
1032   if (CMSUseOldDefaults) {  // old defaults: "old" as of 6.0
1033     if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1034       FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1035     }
1036     young_gen_per_worker = 4*M;
1037     new_ratio = (intx)15;
1038     min_new_default = 4*M;
1039     tenuring_default = (intx)0;
1040   } else { // new defaults: "new" as of 6.0
1041     young_gen_per_worker = CMSYoungGenPerWorker;
1042     new_ratio = (intx)7;
1043     min_new_default = 16*M;
1044     tenuring_default = (intx)4;
1045   }
1046 
1047   // Preferred young gen size for "short" pauses
1048   const uintx parallel_gc_threads =
1049     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1050   const size_t preferred_max_new_size_unaligned =
1051     ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1052   const size_t preferred_max_new_size =
1053     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1054 
1055   // Unless explicitly requested otherwise, size young gen
1056   // for "short" pauses ~ 4M*ParallelGCThreads
1057 
1058   // If either MaxNewSize or NewRatio is set on the command line,
1059   // assume the user is trying to set the size of the young gen.
1060 
1061   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1062 
1063     // Set MaxNewSize to our calculated preferred_max_new_size unless
1064     // NewSize was set on the command line and it is larger than
1065     // preferred_max_new_size.
1066     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1067       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1068     } else {
1069       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1070     }
1071     if(PrintGCDetails && Verbose) {
1072       // Too early to use gclog_or_tty
1073       tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1074     }
1075 
1076     // Unless explicitly requested otherwise, prefer a large
1077     // Old to Young gen size so as to shift the collection load
1078     // to the old generation concurrent collector
1079 
1080     // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1081     // then NewSize and OldSize may be calculated.  That would
1082     // generally lead to some differences with ParNewGC for which
1083     // there was no obvious reason.  Also limit to the case where
1084     // MaxNewSize has not been set.
1085 
1086     FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1087 
1088     // Code along this path potentially sets NewSize and OldSize
1089 
1090     // Calculate the desired minimum size of the young gen but if
1091     // NewSize has been set on the command line, use it here since
1092     // it should be the final value.
1093     size_t min_new;
1094     if (FLAG_IS_DEFAULT(NewSize)) {
1095       min_new = align_size_up(ScaleForWordSize(min_new_default),
1096                               os::vm_page_size());
1097     } else {
1098       min_new = NewSize;
1099     }
1100     size_t prev_initial_size = initial_heap_size();
1101     if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
1102       set_initial_heap_size(min_new+OldSize);
1103       // Currently minimum size and the initial heap sizes are the same.
1104       set_min_heap_size(initial_heap_size());
1105       if (PrintGCDetails && Verbose) {
1106         warning("Initial heap size increased to " SIZE_FORMAT " M from "
1107                 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1108                 initial_heap_size()/M, prev_initial_size/M);
1109       }
1110     }
1111 
1112     // MaxHeapSize is aligned down in collectorPolicy
1113     size_t max_heap =
1114       align_size_down(MaxHeapSize,
1115                       CardTableRS::ct_max_alignment_constraint());
1116 
1117     if(PrintGCDetails && Verbose) {
1118       // Too early to use gclog_or_tty
1119       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1120            " initial_heap_size:  " SIZE_FORMAT
1121            " max_heap: " SIZE_FORMAT,
1122            min_heap_size(), initial_heap_size(), max_heap);
1123     }
1124     if (max_heap > min_new) {
1125       // Unless explicitly requested otherwise, make young gen
1126       // at least min_new, and at most preferred_max_new_size.
1127       if (FLAG_IS_DEFAULT(NewSize)) {
1128         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1129         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1130         if(PrintGCDetails && Verbose) {
1131           // Too early to use gclog_or_tty
1132           tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1133         }
1134       }
1135       // Unless explicitly requested otherwise, size old gen
1136       // so that it's at least 3X of NewSize to begin with;
1137       // later NewRatio will decide how it grows; see above.
1138       if (FLAG_IS_DEFAULT(OldSize)) {
1139         if (max_heap > NewSize) {
1140           FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize,  max_heap - NewSize));
1141           if(PrintGCDetails && Verbose) {
1142             // Too early to use gclog_or_tty
1143             tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1144           }
1145         }
1146       }
1147     }
1148   }
1149   // Unless explicitly requested otherwise, definitely
1150   // promote all objects surviving "tenuring_default" scavenges.
1151   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1152       FLAG_IS_DEFAULT(SurvivorRatio)) {
1153     FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1154   }
1155   // If we decided above (or user explicitly requested)
1156   // `promote all' (via MaxTenuringThreshold := 0),
1157   // prefer minuscule survivor spaces so as not to waste
1158   // space for (non-existent) survivors
1159   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1160     FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1161   }
1162   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1163   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1164   // This is done in order to make ParNew+CMS configuration to work
1165   // with YoungPLABSize and OldPLABSize options.
1166   // See CR 6362902.
1167   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1168     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1169       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1170       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1171       // the value (either from the command line or ergonomics) of
1172       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1173       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1174     }
1175     else {
1176       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1177       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1178       // we'll let it to take precedence.
1179       jio_fprintf(defaultStream::error_stream(),
1180                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1181                   " options are specified for the CMS collector."
1182                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1183     }
1184   }
1185 }
1186 
1187 inline uintx max_heap_for_compressed_oops() {
1188   LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1189   NOT_LP64(return DefaultMaxRAM);
1190 }
1191 
1192 bool Arguments::should_auto_select_low_pause_collector() {
1193   if (UseAutoGCSelectPolicy &&
1194       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1195       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1196     if (PrintGCDetails) {
1197       // Cannot use gclog_or_tty yet.
1198       tty->print_cr("Automatic selection of the low pause collector"
1199        " based on pause goal of %d (ms)", MaxGCPauseMillis);
1200     }
1201     return true;
1202   }
1203   return false;
1204 }
1205 
1206 void Arguments::set_ergonomics_flags() {
1207   // Parallel GC is not compatible with sharing. If one specifies
1208   // that they want sharing explicitly, do not set ergonmics flags.
1209   if (DumpSharedSpaces || ForceSharedSpaces) {
1210     return;
1211   }
1212 
1213   if (os::is_server_class_machine() && !force_client_mode ) {
1214     // If no other collector is requested explicitly,
1215     // let the VM select the collector based on
1216     // machine class and automatic selection policy.
1217     if (!UseSerialGC &&
1218         !UseConcMarkSweepGC &&
1219         !UseG1GC &&
1220         !UseParNewGC &&
1221         !DumpSharedSpaces &&
1222         FLAG_IS_DEFAULT(UseParallelGC)) {
1223       if (should_auto_select_low_pause_collector()) {
1224         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1225       } else {
1226         FLAG_SET_ERGO(bool, UseParallelGC, true);
1227       }
1228       no_shared_spaces();
1229     }
1230   }
1231 
1232 #ifndef ZERO
1233 #ifdef _LP64
1234   // Check that UseCompressedOops can be set with the max heap size allocated
1235   // by ergonomics.
1236   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1237     if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1238       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1239     }
1240 #ifdef _WIN64
1241     if (UseLargePages && UseCompressedOops) {
1242       // Cannot allocate guard pages for implicit checks in indexed addressing
1243       // mode, when large pages are specified on windows.
1244       // This flag could be switched ON if narrow oop base address is set to 0,
1245       // see code in Universe::initialize_heap().
1246       Universe::set_narrow_oop_use_implicit_null_checks(false);
1247     }
1248 #endif //  _WIN64
1249   } else {
1250     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1251       warning("Max heap size too large for Compressed Oops");
1252       FLAG_SET_DEFAULT(UseCompressedOops, false);
1253     }
1254   }
1255   // Also checks that certain machines are slower with compressed oops
1256   // in vm_version initialization code.
1257 #endif // _LP64
1258 #endif // !ZERO
1259 }
1260 
1261 void Arguments::set_parallel_gc_flags() {
1262   assert(UseParallelGC || UseParallelOldGC, "Error");
1263   // If parallel old was requested, automatically enable parallel scavenge.
1264   if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1265     FLAG_SET_DEFAULT(UseParallelGC, true);
1266   }
1267 
1268   // If no heap maximum was requested explicitly, use some reasonable fraction
1269   // of the physical memory, up to a maximum of 1GB.
1270   if (UseParallelGC) {
1271     FLAG_SET_ERGO(uintx, ParallelGCThreads,
1272                   Abstract_VM_Version::parallel_worker_threads());
1273 
1274     // PS is a server collector, setup the heap sizes accordingly.
1275     set_server_heap_size();
1276     // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1277     // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1278     // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1279     // See CR 6362902 for details.
1280     if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1281       if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1282          FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1283       }
1284       if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1285         FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1286       }
1287     }
1288 
1289     if (UseParallelOldGC) {
1290       // Par compact uses lower default values since they are treated as
1291       // minimums.  These are different defaults because of the different
1292       // interpretation and are not ergonomically set.
1293       if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1294         FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1295       }
1296       if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1297         FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1298       }
1299     }
1300   }
1301 }
1302 
1303 void Arguments::set_g1_gc_flags() {
1304   assert(UseG1GC, "Error");
1305   // G1 is a server collector, setup the heap sizes accordingly.
1306   set_server_heap_size();
1307 #ifdef COMPILER1
1308   FastTLABRefill = false;
1309 #endif
1310   FLAG_SET_DEFAULT(ParallelGCThreads,
1311                      Abstract_VM_Version::parallel_worker_threads());
1312   if (ParallelGCThreads == 0) {
1313     FLAG_SET_DEFAULT(ParallelGCThreads,
1314                      Abstract_VM_Version::parallel_worker_threads());
1315   }
1316   no_shared_spaces();
1317 
1318   // Set the maximum pause time goal to be a reasonable default.
1319   if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
1320     FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
1321   }
1322 }
1323 
1324 void Arguments::set_server_heap_size() {
1325   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1326     const uint64_t reasonable_fraction =
1327       os::physical_memory() / DefaultMaxRAMFraction;
1328     const uint64_t maximum_size = (uint64_t)
1329                  (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ?
1330                      MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) :
1331                      DefaultMaxRAM);
1332     size_t reasonable_max =
1333       (size_t) os::allocatable_physical_memory(reasonable_fraction);
1334     if (reasonable_max > maximum_size) {
1335       reasonable_max = maximum_size;
1336     }
1337     if (PrintGCDetails && Verbose) {
1338       // Cannot use gclog_or_tty yet.
1339       tty->print_cr("  Max heap size for server class platform "
1340                     SIZE_FORMAT, reasonable_max);
1341     }
1342     // If the initial_heap_size has not been set with -Xms,
1343     // then set it as fraction of size of physical memory
1344     // respecting the maximum and minimum sizes of the heap.
1345     if (initial_heap_size() == 0) {
1346       const uint64_t reasonable_initial_fraction =
1347         os::physical_memory() / DefaultInitialRAMFraction;
1348       const size_t reasonable_initial =
1349         (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
1350       const size_t minimum_size = NewSize + OldSize;
1351       set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
1352                                 minimum_size));
1353       // Currently the minimum size and the initial heap sizes are the same.
1354       set_min_heap_size(initial_heap_size());
1355       if (PrintGCDetails && Verbose) {
1356         // Cannot use gclog_or_tty yet.
1357         tty->print_cr("  Initial heap size for server class platform "
1358                       SIZE_FORMAT, initial_heap_size());
1359       }
1360     } else {
1361       // A minimum size was specified on the command line.  Be sure
1362       // that the maximum size is consistent.
1363       if (initial_heap_size() > reasonable_max) {
1364         reasonable_max = initial_heap_size();
1365       }
1366     }
1367     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
1368   }
1369 }
1370 
1371 // This must be called after ergonomics because we want bytecode rewriting
1372 // if the server compiler is used, or if UseSharedSpaces is disabled.
1373 void Arguments::set_bytecode_flags() {
1374   // Better not attempt to store into a read-only space.
1375   if (UseSharedSpaces) {
1376     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1377     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1378   }
1379 
1380   if (!RewriteBytecodes) {
1381     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1382   }
1383 }
1384 
1385 // Aggressive optimization flags  -XX:+AggressiveOpts
1386 void Arguments::set_aggressive_opts_flags() {
1387 #ifdef COMPILER2
1388   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1389     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1390       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1391     }
1392     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1393       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1394     }
1395 
1396     // Feed the cache size setting into the JDK
1397     char buffer[1024];
1398     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1399     add_property(buffer);
1400   }
1401   if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1402     FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1403   }
1404   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1405     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1406   }
1407 #endif
1408 
1409   if (AggressiveOpts) {
1410 // Sample flag setting code
1411 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1412 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1413 //    }
1414   }
1415 }
1416 
1417 //===========================================================================================================
1418 // Parsing of java.compiler property
1419 
1420 void Arguments::process_java_compiler_argument(char* arg) {
1421   // For backwards compatibility, Djava.compiler=NONE or ""
1422   // causes us to switch to -Xint mode UNLESS -Xdebug
1423   // is also specified.
1424   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1425     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1426   }
1427 }
1428 
1429 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1430   _sun_java_launcher = strdup(launcher);
1431 }
1432 
1433 bool Arguments::created_by_java_launcher() {
1434   assert(_sun_java_launcher != NULL, "property must have value");
1435   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1436 }
1437 
1438 //===========================================================================================================
1439 // Parsing of main arguments
1440 
1441 bool Arguments::verify_percentage(uintx value, const char* name) {
1442   if (value <= 100) {
1443     return true;
1444   }
1445   jio_fprintf(defaultStream::error_stream(),
1446               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1447               name, value);
1448   return false;
1449 }
1450 
1451 static void set_serial_gc_flags() {
1452   FLAG_SET_DEFAULT(UseSerialGC, true);
1453   FLAG_SET_DEFAULT(UseParNewGC, false);
1454   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1455   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
1456   FLAG_SET_DEFAULT(UseParallelGC, false);
1457   FLAG_SET_DEFAULT(UseParallelOldGC, false);
1458   FLAG_SET_DEFAULT(UseG1GC, false);
1459 }
1460 
1461 static bool verify_serial_gc_flags() {
1462   return (UseSerialGC &&
1463         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1464           UseParallelGC || UseParallelOldGC));
1465 }
1466 
1467 // Check consistency of GC selection
1468 bool Arguments::check_gc_consistency() {
1469   bool status = true;
1470   // Ensure that the user has not selected conflicting sets
1471   // of collectors. [Note: this check is merely a user convenience;
1472   // collectors over-ride each other so that only a non-conflicting
1473   // set is selected; however what the user gets is not what they
1474   // may have expected from the combination they asked for. It's
1475   // better to reduce user confusion by not allowing them to
1476   // select conflicting combinations.
1477   uint i = 0;
1478   if (UseSerialGC)                       i++;
1479   if (UseConcMarkSweepGC || UseParNewGC) i++;
1480   if (UseParallelGC || UseParallelOldGC) i++;
1481   if (UseG1GC)                           i++;
1482   if (i > 1) {
1483     jio_fprintf(defaultStream::error_stream(),
1484                 "Conflicting collector combinations in option list; "
1485                 "please refer to the release notes for the combinations "
1486                 "allowed\n");
1487     status = false;
1488   }
1489 
1490   return status;
1491 }
1492 
1493 // Check the consistency of vm_init_args
1494 bool Arguments::check_vm_args_consistency() {
1495   // Method for adding checks for flag consistency.
1496   // The intent is to warn the user of all possible conflicts,
1497   // before returning an error.
1498   // Note: Needs platform-dependent factoring.
1499   bool status = true;
1500 
1501 #if ( (defined(COMPILER2) && defined(SPARC)))
1502   // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1503   // on sparc doesn't require generation of a stub as is the case on, e.g.,
1504   // x86.  Normally, VM_Version_init must be called from init_globals in
1505   // init.cpp, which is called by the initial java thread *after* arguments
1506   // have been parsed.  VM_Version_init gets called twice on sparc.
1507   extern void VM_Version_init();
1508   VM_Version_init();
1509   if (!VM_Version::has_v9()) {
1510     jio_fprintf(defaultStream::error_stream(),
1511                 "V8 Machine detected, Server requires V9\n");
1512     status = false;
1513   }
1514 #endif /* COMPILER2 && SPARC */
1515 
1516   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1517   // builds so the cost of stack banging can be measured.
1518 #if (defined(PRODUCT) && defined(SOLARIS))
1519   if (!UseBoundThreads && !UseStackBanging) {
1520     jio_fprintf(defaultStream::error_stream(),
1521                 "-UseStackBanging conflicts with -UseBoundThreads\n");
1522 
1523      status = false;
1524   }
1525 #endif
1526 
1527   if (TLABRefillWasteFraction == 0) {
1528     jio_fprintf(defaultStream::error_stream(),
1529                 "TLABRefillWasteFraction should be a denominator, "
1530                 "not " SIZE_FORMAT "\n",
1531                 TLABRefillWasteFraction);
1532     status = false;
1533   }
1534 
1535   status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1536                               "MaxLiveObjectEvacuationRatio");
1537   status = status && verify_percentage(AdaptiveSizePolicyWeight,
1538                               "AdaptiveSizePolicyWeight");
1539   status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1540   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1541   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1542   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1543 
1544   if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1545     jio_fprintf(defaultStream::error_stream(),
1546                 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1547                 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1548                 MinHeapFreeRatio, MaxHeapFreeRatio);
1549     status = false;
1550   }
1551   // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1552   MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1553 
1554   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1555     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
1556   }
1557 
1558   if (UseParallelOldGC && ParallelOldGCSplitALot) {
1559     // Settings to encourage splitting.
1560     if (!FLAG_IS_CMDLINE(NewRatio)) {
1561       FLAG_SET_CMDLINE(intx, NewRatio, 2);
1562     }
1563     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1564       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1565     }
1566   }
1567 
1568   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1569   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1570   if (GCTimeLimit == 100) {
1571     // Turn off gc-overhead-limit-exceeded checks
1572     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1573   }
1574 
1575   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1576 
1577   // Check user specified sharing option conflict with Parallel GC
1578   bool cannot_share = ((UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || UseParNewGC ||
1579                        UseParallelGC || UseParallelOldGC ||
1580                        SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1581 
1582   if (cannot_share) {
1583     // Either force sharing on by forcing the other options off, or
1584     // force sharing off.
1585     if (DumpSharedSpaces || ForceSharedSpaces) {
1586       jio_fprintf(defaultStream::error_stream(),
1587                   "Reverting to Serial GC because of %s \n",
1588                   ForceSharedSpaces ? " -Xshare:on" : "-Xshare:dump");
1589       set_serial_gc_flags();
1590       FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1591     } else {
1592       if (UseSharedSpaces) {
1593         jio_fprintf(defaultStream::error_stream(),
1594                     "Turning off use of shared archive because of "
1595                     "choice of garbage collector or large pages \n");
1596       }
1597       no_shared_spaces();
1598     }
1599   }
1600 
1601   status = status && check_gc_consistency();
1602 
1603   if (_has_alloc_profile) {
1604     if (UseParallelGC || UseParallelOldGC) {
1605       jio_fprintf(defaultStream::error_stream(),
1606                   "error:  invalid argument combination.\n"
1607                   "Allocation profiling (-Xaprof) cannot be used together with "
1608                   "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1609       status = false;
1610     }
1611     if (UseConcMarkSweepGC) {
1612       jio_fprintf(defaultStream::error_stream(),
1613                   "error:  invalid argument combination.\n"
1614                   "Allocation profiling (-Xaprof) cannot be used together with "
1615                   "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1616       status = false;
1617     }
1618   }
1619 
1620   if (CMSIncrementalMode) {
1621     if (!UseConcMarkSweepGC) {
1622       jio_fprintf(defaultStream::error_stream(),
1623                   "error:  invalid argument combination.\n"
1624                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1625                   "selected in order\nto use CMSIncrementalMode.\n");
1626       status = false;
1627     } else {
1628       status = status && verify_percentage(CMSIncrementalDutyCycle,
1629                                   "CMSIncrementalDutyCycle");
1630       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1631                                   "CMSIncrementalDutyCycleMin");
1632       status = status && verify_percentage(CMSIncrementalSafetyFactor,
1633                                   "CMSIncrementalSafetyFactor");
1634       status = status && verify_percentage(CMSIncrementalOffset,
1635                                   "CMSIncrementalOffset");
1636       status = status && verify_percentage(CMSExpAvgFactor,
1637                                   "CMSExpAvgFactor");
1638       // If it was not set on the command line, set
1639       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1640       if (CMSInitiatingOccupancyFraction < 0) {
1641         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1642       }
1643     }
1644   }
1645 
1646   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1647   // insists that we hold the requisite locks so that the iteration is
1648   // MT-safe. For the verification at start-up and shut-down, we don't
1649   // yet have a good way of acquiring and releasing these locks,
1650   // which are not visible at the CollectedHeap level. We want to
1651   // be able to acquire these locks and then do the iteration rather
1652   // than just disable the lock verification. This will be fixed under
1653   // bug 4788986.
1654   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1655     if (VerifyGCStartAt == 0) {
1656       warning("Heap verification at start-up disabled "
1657               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1658       VerifyGCStartAt = 1;      // Disable verification at start-up
1659     }
1660     if (VerifyBeforeExit) {
1661       warning("Heap verification at shutdown disabled "
1662               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1663       VerifyBeforeExit = false; // Disable verification at shutdown
1664     }
1665   }
1666 
1667   // Note: only executed in non-PRODUCT mode
1668   if (!UseAsyncConcMarkSweepGC &&
1669       (ExplicitGCInvokesConcurrent ||
1670        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1671     jio_fprintf(defaultStream::error_stream(),
1672                 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1673                 " with -UseAsyncConcMarkSweepGC");
1674     status = false;
1675   }
1676 
1677   return status;
1678 }
1679 
1680 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1681   const char* option_type) {
1682   if (ignore) return false;
1683 
1684   const char* spacer = " ";
1685   if (option_type == NULL) {
1686     option_type = ++spacer; // Set both to the empty string.
1687   }
1688 
1689   if (os::obsolete_option(option)) {
1690     jio_fprintf(defaultStream::error_stream(),
1691                 "Obsolete %s%soption: %s\n", option_type, spacer,
1692       option->optionString);
1693     return false;
1694   } else {
1695     jio_fprintf(defaultStream::error_stream(),
1696                 "Unrecognized %s%soption: %s\n", option_type, spacer,
1697       option->optionString);
1698     return true;
1699   }
1700 }
1701 
1702 static const char* user_assertion_options[] = {
1703   "-da", "-ea", "-disableassertions", "-enableassertions", 0
1704 };
1705 
1706 static const char* system_assertion_options[] = {
1707   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1708 };
1709 
1710 // Return true if any of the strings in null-terminated array 'names' matches.
1711 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1712 // the option must match exactly.
1713 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1714   bool tail_allowed) {
1715   for (/* empty */; *names != NULL; ++names) {
1716     if (match_option(option, *names, tail)) {
1717       if (**tail == '\0' || tail_allowed && **tail == ':') {
1718         return true;
1719       }
1720     }
1721   }
1722   return false;
1723 }
1724 
1725 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1726                                                   julong* long_arg,
1727                                                   julong min_size) {
1728   if (!atomull(s, long_arg)) return arg_unreadable;
1729   return check_memory_size(*long_arg, min_size);
1730 }
1731 
1732 // Parse JavaVMInitArgs structure
1733 
1734 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1735   // For components of the system classpath.
1736   SysClassPath scp(Arguments::get_sysclasspath());
1737   bool scp_assembly_required = false;
1738 
1739   // Save default settings for some mode flags
1740   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1741   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
1742   Arguments::_ClipInlining             = ClipInlining;
1743   Arguments::_BackgroundCompilation    = BackgroundCompilation;
1744   Arguments::_Tier2CompileThreshold    = Tier2CompileThreshold;
1745 
1746   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1747   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1748   if (result != JNI_OK) {
1749     return result;
1750   }
1751 
1752   // Parse JavaVMInitArgs structure passed in
1753   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1754   if (result != JNI_OK) {
1755     return result;
1756   }
1757 
1758   if (AggressiveOpts) {
1759     // Insert alt-rt.jar between user-specified bootclasspath
1760     // prefix and the default bootclasspath.  os::set_boot_path()
1761     // uses meta_index_dir as the default bootclasspath directory.
1762     const char* altclasses_jar = "alt-rt.jar";
1763     size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
1764                                  strlen(altclasses_jar);
1765     char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
1766     strcpy(altclasses_path, get_meta_index_dir());
1767     strcat(altclasses_path, altclasses_jar);
1768     scp.add_suffix_to_prefix(altclasses_path);
1769     scp_assembly_required = true;
1770     FREE_C_HEAP_ARRAY(char, altclasses_path);
1771   }
1772 
1773   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1774   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1775   if (result != JNI_OK) {
1776     return result;
1777   }
1778 
1779   // Do final processing now that all arguments have been parsed
1780   result = finalize_vm_init_args(&scp, scp_assembly_required);
1781   if (result != JNI_OK) {
1782     return result;
1783   }
1784 
1785   return JNI_OK;
1786 }
1787 
1788 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1789                                        SysClassPath* scp_p,
1790                                        bool* scp_assembly_required_p,
1791                                        FlagValueOrigin origin) {
1792   // Remaining part of option string
1793   const char* tail;
1794 
1795   // iterate over arguments
1796   for (int index = 0; index < args->nOptions; index++) {
1797     bool is_absolute_path = false;  // for -agentpath vs -agentlib
1798 
1799     const JavaVMOption* option = args->options + index;
1800 
1801     if (!match_option(option, "-Djava.class.path", &tail) &&
1802         !match_option(option, "-Dsun.java.command", &tail) &&
1803         !match_option(option, "-Dsun.java.launcher", &tail)) {
1804 
1805         // add all jvm options to the jvm_args string. This string
1806         // is used later to set the java.vm.args PerfData string constant.
1807         // the -Djava.class.path and the -Dsun.java.command options are
1808         // omitted from jvm_args string as each have their own PerfData
1809         // string constant object.
1810         build_jvm_args(option->optionString);
1811     }
1812 
1813     // -verbose:[class/gc/jni]
1814     if (match_option(option, "-verbose", &tail)) {
1815       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1816         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1817         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1818       } else if (!strcmp(tail, ":gc")) {
1819         FLAG_SET_CMDLINE(bool, PrintGC, true);
1820         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1821       } else if (!strcmp(tail, ":jni")) {
1822         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1823       }
1824     // -da / -ea / -disableassertions / -enableassertions
1825     // These accept an optional class/package name separated by a colon, e.g.,
1826     // -da:java.lang.Thread.
1827     } else if (match_option(option, user_assertion_options, &tail, true)) {
1828       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
1829       if (*tail == '\0') {
1830         JavaAssertions::setUserClassDefault(enable);
1831       } else {
1832         assert(*tail == ':', "bogus match by match_option()");
1833         JavaAssertions::addOption(tail + 1, enable);
1834       }
1835     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1836     } else if (match_option(option, system_assertion_options, &tail, false)) {
1837       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
1838       JavaAssertions::setSystemClassDefault(enable);
1839     // -bootclasspath:
1840     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1841       scp_p->reset_path(tail);
1842       *scp_assembly_required_p = true;
1843     // -bootclasspath/a:
1844     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1845       scp_p->add_suffix(tail);
1846       *scp_assembly_required_p = true;
1847     // -bootclasspath/p:
1848     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1849       scp_p->add_prefix(tail);
1850       *scp_assembly_required_p = true;
1851     // -Xrun
1852     } else if (match_option(option, "-Xrun", &tail)) {
1853       if (tail != NULL) {
1854         const char* pos = strchr(tail, ':');
1855         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1856         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1857         name[len] = '\0';
1858 
1859         char *options = NULL;
1860         if(pos != NULL) {
1861           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
1862           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1863         }
1864 #ifdef JVMTI_KERNEL
1865         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1866           warning("profiling and debugging agents are not supported with Kernel VM");
1867         } else
1868 #endif // JVMTI_KERNEL
1869         add_init_library(name, options);
1870       }
1871     // -agentlib and -agentpath
1872     } else if (match_option(option, "-agentlib:", &tail) ||
1873           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1874       if(tail != NULL) {
1875         const char* pos = strchr(tail, '=');
1876         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1877         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1878         name[len] = '\0';
1879 
1880         char *options = NULL;
1881         if(pos != NULL) {
1882           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1883         }
1884 #ifdef JVMTI_KERNEL
1885         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1886           warning("profiling and debugging agents are not supported with Kernel VM");
1887         } else
1888 #endif // JVMTI_KERNEL
1889         add_init_agent(name, options, is_absolute_path);
1890 
1891       }
1892     // -javaagent
1893     } else if (match_option(option, "-javaagent:", &tail)) {
1894       if(tail != NULL) {
1895         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1896         add_init_agent("instrument", options, false);
1897       }
1898     // -Xnoclassgc
1899     } else if (match_option(option, "-Xnoclassgc", &tail)) {
1900       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1901     // -Xincgc: i-CMS
1902     } else if (match_option(option, "-Xincgc", &tail)) {
1903       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1904       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1905     // -Xnoincgc: no i-CMS
1906     } else if (match_option(option, "-Xnoincgc", &tail)) {
1907       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1908       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1909     // -Xconcgc
1910     } else if (match_option(option, "-Xconcgc", &tail)) {
1911       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1912     // -Xnoconcgc
1913     } else if (match_option(option, "-Xnoconcgc", &tail)) {
1914       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1915     // -Xbatch
1916     } else if (match_option(option, "-Xbatch", &tail)) {
1917       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1918     // -Xmn for compatibility with other JVM vendors
1919     } else if (match_option(option, "-Xmn", &tail)) {
1920       julong long_initial_eden_size = 0;
1921       ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1922       if (errcode != arg_in_range) {
1923         jio_fprintf(defaultStream::error_stream(),
1924                     "Invalid initial eden size: %s\n", option->optionString);
1925         describe_range_error(errcode);
1926         return JNI_EINVAL;
1927       }
1928       FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
1929       FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
1930     // -Xms
1931     } else if (match_option(option, "-Xms", &tail)) {
1932       julong long_initial_heap_size = 0;
1933       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1934       if (errcode != arg_in_range) {
1935         jio_fprintf(defaultStream::error_stream(),
1936                     "Invalid initial heap size: %s\n", option->optionString);
1937         describe_range_error(errcode);
1938         return JNI_EINVAL;
1939       }
1940       set_initial_heap_size((size_t) long_initial_heap_size);
1941       // Currently the minimum size and the initial heap sizes are the same.
1942       set_min_heap_size(initial_heap_size());
1943     // -Xmx
1944     } else if (match_option(option, "-Xmx", &tail)) {
1945       julong long_max_heap_size = 0;
1946       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1947       if (errcode != arg_in_range) {
1948         jio_fprintf(defaultStream::error_stream(),
1949                     "Invalid maximum heap size: %s\n", option->optionString);
1950         describe_range_error(errcode);
1951         return JNI_EINVAL;
1952       }
1953       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
1954     // Xmaxf
1955     } else if (match_option(option, "-Xmaxf", &tail)) {
1956       int maxf = (int)(atof(tail) * 100);
1957       if (maxf < 0 || maxf > 100) {
1958         jio_fprintf(defaultStream::error_stream(),
1959                     "Bad max heap free percentage size: %s\n",
1960                     option->optionString);
1961         return JNI_EINVAL;
1962       } else {
1963         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
1964       }
1965     // Xminf
1966     } else if (match_option(option, "-Xminf", &tail)) {
1967       int minf = (int)(atof(tail) * 100);
1968       if (minf < 0 || minf > 100) {
1969         jio_fprintf(defaultStream::error_stream(),
1970                     "Bad min heap free percentage size: %s\n",
1971                     option->optionString);
1972         return JNI_EINVAL;
1973       } else {
1974         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
1975       }
1976     // -Xss
1977     } else if (match_option(option, "-Xss", &tail)) {
1978       julong long_ThreadStackSize = 0;
1979       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
1980       if (errcode != arg_in_range) {
1981         jio_fprintf(defaultStream::error_stream(),
1982                     "Invalid thread stack size: %s\n", option->optionString);
1983         describe_range_error(errcode);
1984         return JNI_EINVAL;
1985       }
1986       // Internally track ThreadStackSize in units of 1024 bytes.
1987       FLAG_SET_CMDLINE(intx, ThreadStackSize,
1988                               round_to((int)long_ThreadStackSize, K) / K);
1989     // -Xoss
1990     } else if (match_option(option, "-Xoss", &tail)) {
1991           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
1992     // -Xmaxjitcodesize
1993     } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
1994       julong long_ReservedCodeCacheSize = 0;
1995       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
1996                                             (size_t)InitialCodeCacheSize);
1997       if (errcode != arg_in_range) {
1998         jio_fprintf(defaultStream::error_stream(),
1999                     "Invalid maximum code cache size: %s\n",
2000                     option->optionString);
2001         describe_range_error(errcode);
2002         return JNI_EINVAL;
2003       }
2004       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2005     // -green
2006     } else if (match_option(option, "-green", &tail)) {
2007       jio_fprintf(defaultStream::error_stream(),
2008                   "Green threads support not available\n");
2009           return JNI_EINVAL;
2010     // -native
2011     } else if (match_option(option, "-native", &tail)) {
2012           // HotSpot always uses native threads, ignore silently for compatibility
2013     // -Xsqnopause
2014     } else if (match_option(option, "-Xsqnopause", &tail)) {
2015           // EVM option, ignore silently for compatibility
2016     // -Xrs
2017     } else if (match_option(option, "-Xrs", &tail)) {
2018           // Classic/EVM option, new functionality
2019       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2020     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2021           // change default internal VM signals used - lower case for back compat
2022       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2023     // -Xoptimize
2024     } else if (match_option(option, "-Xoptimize", &tail)) {
2025           // EVM option, ignore silently for compatibility
2026     // -Xprof
2027     } else if (match_option(option, "-Xprof", &tail)) {
2028 #ifndef FPROF_KERNEL
2029       _has_profile = true;
2030 #else // FPROF_KERNEL
2031       // do we have to exit?
2032       warning("Kernel VM does not support flat profiling.");
2033 #endif // FPROF_KERNEL
2034     // -Xaprof
2035     } else if (match_option(option, "-Xaprof", &tail)) {
2036       _has_alloc_profile = true;
2037     // -Xconcurrentio
2038     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2039       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2040       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2041       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2042       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2043       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2044 
2045       // -Xinternalversion
2046     } else if (match_option(option, "-Xinternalversion", &tail)) {
2047       jio_fprintf(defaultStream::output_stream(), "%s\n",
2048                   VM_Version::internal_vm_info_string());
2049       vm_exit(0);
2050 #ifndef PRODUCT
2051     // -Xprintflags
2052     } else if (match_option(option, "-Xprintflags", &tail)) {
2053       CommandLineFlags::printFlags();
2054       vm_exit(0);
2055 #endif
2056     // -D
2057     } else if (match_option(option, "-D", &tail)) {
2058       if (!add_property(tail)) {
2059         return JNI_ENOMEM;
2060       }
2061       // Out of the box management support
2062       if (match_option(option, "-Dcom.sun.management", &tail)) {
2063         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2064       }
2065     // -Xint
2066     } else if (match_option(option, "-Xint", &tail)) {
2067           set_mode_flags(_int);
2068     // -Xmixed
2069     } else if (match_option(option, "-Xmixed", &tail)) {
2070           set_mode_flags(_mixed);
2071     // -Xcomp
2072     } else if (match_option(option, "-Xcomp", &tail)) {
2073       // for testing the compiler; turn off all flags that inhibit compilation
2074           set_mode_flags(_comp);
2075 
2076     // -Xshare:dump
2077     } else if (match_option(option, "-Xshare:dump", &tail)) {
2078 #ifdef TIERED
2079       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2080       set_mode_flags(_int);     // Prevent compilation, which creates objects
2081 #elif defined(COMPILER2)
2082       vm_exit_during_initialization(
2083           "Dumping a shared archive is not supported on the Server JVM.", NULL);
2084 #elif defined(KERNEL)
2085       vm_exit_during_initialization(
2086           "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2087 #else
2088       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2089       set_mode_flags(_int);     // Prevent compilation, which creates objects
2090 #endif
2091     // -Xshare:on
2092     } else if (match_option(option, "-Xshare:on", &tail)) {
2093       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2094       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2095 #ifdef TIERED
2096       FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2097 #endif // TIERED
2098     // -Xshare:auto
2099     } else if (match_option(option, "-Xshare:auto", &tail)) {
2100       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2101       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2102     // -Xshare:off
2103     } else if (match_option(option, "-Xshare:off", &tail)) {
2104       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2105       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2106 
2107     // -Xverify
2108     } else if (match_option(option, "-Xverify", &tail)) {
2109       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2110         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2111         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2112       } else if (strcmp(tail, ":remote") == 0) {
2113         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2114         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2115       } else if (strcmp(tail, ":none") == 0) {
2116         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2117         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2118       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2119         return JNI_EINVAL;
2120       }
2121     // -Xdebug
2122     } else if (match_option(option, "-Xdebug", &tail)) {
2123       // note this flag has been used, then ignore
2124       set_xdebug_mode(true);
2125     // -Xnoagent
2126     } else if (match_option(option, "-Xnoagent", &tail)) {
2127       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2128     } else if (match_option(option, "-Xboundthreads", &tail)) {
2129       // Bind user level threads to kernel threads (Solaris only)
2130       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2131     } else if (match_option(option, "-Xloggc:", &tail)) {
2132       // Redirect GC output to the file. -Xloggc:<filename>
2133       // ostream_init_log(), when called will use this filename
2134       // to initialize a fileStream.
2135       _gc_log_filename = strdup(tail);
2136       FLAG_SET_CMDLINE(bool, PrintGC, true);
2137       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2138       FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2139 
2140     // JNI hooks
2141     } else if (match_option(option, "-Xcheck", &tail)) {
2142       if (!strcmp(tail, ":jni")) {
2143         CheckJNICalls = true;
2144       } else if (is_bad_option(option, args->ignoreUnrecognized,
2145                                      "check")) {
2146         return JNI_EINVAL;
2147       }
2148     } else if (match_option(option, "vfprintf", &tail)) {
2149       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2150     } else if (match_option(option, "exit", &tail)) {
2151       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2152     } else if (match_option(option, "abort", &tail)) {
2153       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2154     // -XX:+AggressiveHeap
2155     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2156 
2157       // This option inspects the machine and attempts to set various
2158       // parameters to be optimal for long-running, memory allocation
2159       // intensive jobs.  It is intended for machines with large
2160       // amounts of cpu and memory.
2161 
2162       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2163       // VM, but we may not be able to represent the total physical memory
2164       // available (like having 8gb of memory on a box but using a 32bit VM).
2165       // Thus, we need to make sure we're using a julong for intermediate
2166       // calculations.
2167       julong initHeapSize;
2168       julong total_memory = os::physical_memory();
2169 
2170       if (total_memory < (julong)256*M) {
2171         jio_fprintf(defaultStream::error_stream(),
2172                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2173         vm_exit(1);
2174       }
2175 
2176       // The heap size is half of available memory, or (at most)
2177       // all of possible memory less 160mb (leaving room for the OS
2178       // when using ISM).  This is the maximum; because adaptive sizing
2179       // is turned on below, the actual space used may be smaller.
2180 
2181       initHeapSize = MIN2(total_memory / (julong)2,
2182                           total_memory - (julong)160*M);
2183 
2184       // Make sure that if we have a lot of memory we cap the 32 bit
2185       // process space.  The 64bit VM version of this function is a nop.
2186       initHeapSize = os::allocatable_physical_memory(initHeapSize);
2187 
2188       // The perm gen is separate but contiguous with the
2189       // object heap (and is reserved with it) so subtract it
2190       // from the heap size.
2191       if (initHeapSize > MaxPermSize) {
2192         initHeapSize = initHeapSize - MaxPermSize;
2193       } else {
2194         warning("AggressiveHeap and MaxPermSize values may conflict");
2195       }
2196 
2197       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2198          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2199          set_initial_heap_size(MaxHeapSize);
2200          // Currently the minimum size and the initial heap sizes are the same.
2201          set_min_heap_size(initial_heap_size());
2202       }
2203       if (FLAG_IS_DEFAULT(NewSize)) {
2204          // Make the young generation 3/8ths of the total heap.
2205          FLAG_SET_CMDLINE(uintx, NewSize,
2206                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2207          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2208       }
2209 
2210       FLAG_SET_DEFAULT(UseLargePages, true);
2211 
2212       // Increase some data structure sizes for efficiency
2213       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2214       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2215       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2216 
2217       // See the OldPLABSize comment below, but replace 'after promotion'
2218       // with 'after copying'.  YoungPLABSize is the size of the survivor
2219       // space per-gc-thread buffers.  The default is 4kw.
2220       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
2221 
2222       // OldPLABSize is the size of the buffers in the old gen that
2223       // UseParallelGC uses to promote live data that doesn't fit in the
2224       // survivor spaces.  At any given time, there's one for each gc thread.
2225       // The default size is 1kw. These buffers are rarely used, since the
2226       // survivor spaces are usually big enough.  For specjbb, however, there
2227       // are occasions when there's lots of live data in the young gen
2228       // and we end up promoting some of it.  We don't have a definite
2229       // explanation for why bumping OldPLABSize helps, but the theory
2230       // is that a bigger PLAB results in retaining something like the
2231       // original allocation order after promotion, which improves mutator
2232       // locality.  A minor effect may be that larger PLABs reduce the
2233       // number of PLAB allocation events during gc.  The value of 8kw
2234       // was arrived at by experimenting with specjbb.
2235       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
2236 
2237       // CompilationPolicyChoice=0 causes the server compiler to adopt
2238       // a more conservative which-method-do-I-compile policy when one
2239       // of the counters maintained by the interpreter trips.  The
2240       // result is reduced startup time and improved specjbb and
2241       // alacrity performance.  Zero is the default, but we set it
2242       // explicitly here in case the default changes.
2243       // See runtime/compilationPolicy.*.
2244       FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2245 
2246       // Enable parallel GC and adaptive generation sizing
2247       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2248       FLAG_SET_DEFAULT(ParallelGCThreads,
2249                        Abstract_VM_Version::parallel_worker_threads());
2250 
2251       // Encourage steady state memory management
2252       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2253 
2254       // This appears to improve mutator locality
2255       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2256 
2257       // Get around early Solaris scheduling bug
2258       // (affinity vs other jobs on system)
2259       // but disallow DR and offlining (5008695).
2260       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2261 
2262     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2263       // The last option must always win.
2264       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2265       FLAG_SET_CMDLINE(bool, NeverTenure, true);
2266     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2267       // The last option must always win.
2268       FLAG_SET_CMDLINE(bool, NeverTenure, false);
2269       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2270     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2271                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2272       jio_fprintf(defaultStream::error_stream(),
2273         "Please use CMSClassUnloadingEnabled in place of "
2274         "CMSPermGenSweepingEnabled in the future\n");
2275     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2276       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2277       jio_fprintf(defaultStream::error_stream(),
2278         "Please use -XX:+UseGCOverheadLimit in place of "
2279         "-XX:+UseGCTimeLimit in the future\n");
2280     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2281       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2282       jio_fprintf(defaultStream::error_stream(),
2283         "Please use -XX:-UseGCOverheadLimit in place of "
2284         "-XX:-UseGCTimeLimit in the future\n");
2285     // The TLE options are for compatibility with 1.3 and will be
2286     // removed without notice in a future release.  These options
2287     // are not to be documented.
2288     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2289       // No longer used.
2290     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2291       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2292     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2293       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2294     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2295       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2296     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2297       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2298     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2299       // No longer used.
2300     } else if (match_option(option, "-XX:TLESize=", &tail)) {
2301       julong long_tlab_size = 0;
2302       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2303       if (errcode != arg_in_range) {
2304         jio_fprintf(defaultStream::error_stream(),
2305                     "Invalid TLAB size: %s\n", option->optionString);
2306         describe_range_error(errcode);
2307         return JNI_EINVAL;
2308       }
2309       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2310     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2311       // No longer used.
2312     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2313       FLAG_SET_CMDLINE(bool, UseTLAB, true);
2314     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2315       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2316 SOLARIS_ONLY(
2317     } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2318       warning("-XX:+UsePermISM is obsolete.");
2319       FLAG_SET_CMDLINE(bool, UseISM, true);
2320     } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2321       FLAG_SET_CMDLINE(bool, UseISM, false);
2322 )
2323     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2324       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2325       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2326     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2327       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2328       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2329     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2330 #ifdef SOLARIS
2331       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2332       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2333       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2334       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2335 #else // ndef SOLARIS
2336       jio_fprintf(defaultStream::error_stream(),
2337                   "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2338       return JNI_EINVAL;
2339 #endif // ndef SOLARIS
2340     } else
2341 #ifdef ASSERT
2342     if (match_option(option, "-XX:+FullGCALot", &tail)) {
2343       FLAG_SET_CMDLINE(bool, FullGCALot, true);
2344       // disable scavenge before parallel mark-compact
2345       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2346     } else
2347 #endif
2348     if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2349       julong cms_blocks_to_claim = (julong)atol(tail);
2350       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2351       jio_fprintf(defaultStream::error_stream(),
2352         "Please use -XX:CMSParPromoteBlocksToClaim in place of "
2353         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2354     } else
2355     if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2356       julong old_plab_size = 0;
2357       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2358       if (errcode != arg_in_range) {
2359         jio_fprintf(defaultStream::error_stream(),
2360                     "Invalid old PLAB size: %s\n", option->optionString);
2361         describe_range_error(errcode);
2362         return JNI_EINVAL;
2363       }
2364       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2365       jio_fprintf(defaultStream::error_stream(),
2366                   "Please use -XX:OldPLABSize in place of "
2367                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2368     } else
2369     if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2370       julong young_plab_size = 0;
2371       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2372       if (errcode != arg_in_range) {
2373         jio_fprintf(defaultStream::error_stream(),
2374                     "Invalid young PLAB size: %s\n", option->optionString);
2375         describe_range_error(errcode);
2376         return JNI_EINVAL;
2377       }
2378       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2379       jio_fprintf(defaultStream::error_stream(),
2380                   "Please use -XX:YoungPLABSize in place of "
2381                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2382     } else
2383     if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2384       // Skip -XX:Flags= since that case has already been handled
2385       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2386         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2387           return JNI_EINVAL;
2388         }
2389       }
2390     // Unknown option
2391     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2392       return JNI_ERR;
2393     }
2394   }
2395   // Change the default value for flags  which have different default values
2396   // when working with older JDKs.
2397   if (JDK_Version::current().compare_major(6) <= 0 &&
2398       FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2399     FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2400   }
2401   return JNI_OK;
2402 }
2403 
2404 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2405   // This must be done after all -D arguments have been processed.
2406   scp_p->expand_endorsed();
2407 
2408   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2409     // Assemble the bootclasspath elements into the final path.
2410     Arguments::set_sysclasspath(scp_p->combined_path());
2411   }
2412 
2413   // This must be done after all arguments have been processed.
2414   // java_compiler() true means set to "NONE" or empty.
2415   if (java_compiler() && !xdebug_mode()) {
2416     // For backwards compatibility, we switch to interpreted mode if
2417     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2418     // not specified.
2419     set_mode_flags(_int);
2420   }
2421   if (CompileThreshold == 0) {
2422     set_mode_flags(_int);
2423   }
2424 
2425 #ifdef TIERED
2426   // If we are using tiered compilation in the tiered vm then c1 will
2427   // do the profiling and we don't want to waste that time in the
2428   // interpreter.
2429   if (TieredCompilation) {
2430     ProfileInterpreter = false;
2431   } else {
2432     // Since we are running vanilla server we must adjust the compile threshold
2433     // unless the user has already adjusted it because the default threshold assumes
2434     // we will run tiered.
2435 
2436     if (FLAG_IS_DEFAULT(CompileThreshold)) {
2437       CompileThreshold = Tier2CompileThreshold;
2438     }
2439   }
2440 #endif // TIERED
2441 
2442 #ifndef COMPILER2
2443   // Don't degrade server performance for footprint
2444   if (FLAG_IS_DEFAULT(UseLargePages) &&
2445       MaxHeapSize < LargePageHeapSizeThreshold) {
2446     // No need for large granularity pages w/small heaps.
2447     // Note that large pages are enabled/disabled for both the
2448     // Java heap and the code cache.
2449     FLAG_SET_DEFAULT(UseLargePages, false);
2450     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2451     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2452   }
2453 
2454 #else
2455   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2456     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2457   }
2458   // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2459   if (UseG1GC) {
2460     FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2461   }
2462 #endif
2463 
2464   if (!check_vm_args_consistency()) {
2465     return JNI_ERR;
2466   }
2467 
2468   return JNI_OK;
2469 }
2470 
2471 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2472   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2473                                             scp_assembly_required_p);
2474 }
2475 
2476 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2477   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2478                                             scp_assembly_required_p);
2479 }
2480 
2481 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2482   const int N_MAX_OPTIONS = 64;
2483   const int OPTION_BUFFER_SIZE = 1024;
2484   char buffer[OPTION_BUFFER_SIZE];
2485 
2486   // The variable will be ignored if it exceeds the length of the buffer.
2487   // Don't check this variable if user has special privileges
2488   // (e.g. unix su command).
2489   if (os::getenv(name, buffer, sizeof(buffer)) &&
2490       !os::have_special_privileges()) {
2491     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
2492     jio_fprintf(defaultStream::error_stream(),
2493                 "Picked up %s: %s\n", name, buffer);
2494     char* rd = buffer;                        // pointer to the input string (rd)
2495     int i;
2496     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
2497       while (isspace(*rd)) rd++;              // skip whitespace
2498       if (*rd == 0) break;                    // we re done when the input string is read completely
2499 
2500       // The output, option string, overwrites the input string.
2501       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2502       // input string (rd).
2503       char* wrt = rd;
2504 
2505       options[i++].optionString = wrt;        // Fill in option
2506       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
2507         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
2508           int quote = *rd;                    // matching quote to look for
2509           rd++;                               // don't copy open quote
2510           while (*rd != quote) {              // include everything (even spaces) up until quote
2511             if (*rd == 0) {                   // string termination means unmatched string
2512               jio_fprintf(defaultStream::error_stream(),
2513                           "Unmatched quote in %s\n", name);
2514               return JNI_ERR;
2515             }
2516             *wrt++ = *rd++;                   // copy to option string
2517           }
2518           rd++;                               // don't copy close quote
2519         } else {
2520           *wrt++ = *rd++;                     // copy to option string
2521         }
2522       }
2523       // Need to check if we're done before writing a NULL,
2524       // because the write could be to the byte that rd is pointing to.
2525       if (*rd++ == 0) {
2526         *wrt = 0;
2527         break;
2528       }
2529       *wrt = 0;                               // Zero terminate option
2530     }
2531     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2532     JavaVMInitArgs vm_args;
2533     vm_args.version = JNI_VERSION_1_2;
2534     vm_args.options = options;
2535     vm_args.nOptions = i;
2536     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2537 
2538     if (PrintVMOptions) {
2539       const char* tail;
2540       for (int i = 0; i < vm_args.nOptions; i++) {
2541         const JavaVMOption *option = vm_args.options + i;
2542         if (match_option(option, "-XX:", &tail)) {
2543           logOption(tail);
2544         }
2545       }
2546     }
2547 
2548     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2549   }
2550   return JNI_OK;
2551 }
2552 
2553 // Parse entry point called from JNI_CreateJavaVM
2554 
2555 jint Arguments::parse(const JavaVMInitArgs* args) {
2556 
2557   // Sharing support
2558   // Construct the path to the archive
2559   char jvm_path[JVM_MAXPATHLEN];
2560   os::jvm_path(jvm_path, sizeof(jvm_path));
2561 #ifdef TIERED
2562   if (strstr(jvm_path, "client") != NULL) {
2563     force_client_mode = true;
2564   }
2565 #endif // TIERED
2566   char *end = strrchr(jvm_path, *os::file_separator());
2567   if (end != NULL) *end = '\0';
2568   char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2569                                         strlen(os::file_separator()) + 20);
2570   if (shared_archive_path == NULL) return JNI_ENOMEM;
2571   strcpy(shared_archive_path, jvm_path);
2572   strcat(shared_archive_path, os::file_separator());
2573   strcat(shared_archive_path, "classes");
2574   DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2575   strcat(shared_archive_path, ".jsa");
2576   SharedArchivePath = shared_archive_path;
2577 
2578   // Remaining part of option string
2579   const char* tail;
2580 
2581   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2582   bool settings_file_specified = false;
2583   const char* flags_file;
2584   int index;
2585   for (index = 0; index < args->nOptions; index++) {
2586     const JavaVMOption *option = args->options + index;
2587     if (match_option(option, "-XX:Flags=", &tail)) {
2588       flags_file = tail;
2589       settings_file_specified = true;
2590     }
2591     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2592       PrintVMOptions = true;
2593     }
2594     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2595       PrintVMOptions = false;
2596     }
2597     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2598       IgnoreUnrecognizedVMOptions = true;
2599     }
2600     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2601       IgnoreUnrecognizedVMOptions = false;
2602     }
2603   }
2604 
2605   if (IgnoreUnrecognizedVMOptions) {
2606     // uncast const to modify the flag args->ignoreUnrecognized
2607     *(jboolean*)(&args->ignoreUnrecognized) = true;
2608   }
2609 
2610   // Parse specified settings file
2611   if (settings_file_specified) {
2612     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2613       return JNI_EINVAL;
2614     }
2615   }
2616 
2617   // Parse default .hotspotrc settings file
2618   if (!settings_file_specified) {
2619     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2620       return JNI_EINVAL;
2621     }
2622   }
2623 
2624   if (PrintVMOptions) {
2625     for (index = 0; index < args->nOptions; index++) {
2626       const JavaVMOption *option = args->options + index;
2627       if (match_option(option, "-XX:", &tail)) {
2628         logOption(tail);
2629       }
2630     }
2631   }
2632 
2633   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2634   jint result = parse_vm_init_args(args);
2635   if (result != JNI_OK) {
2636     return result;
2637   }
2638 
2639 #ifndef PRODUCT
2640   if (TraceBytecodesAt != 0) {
2641     TraceBytecodes = true;
2642   }
2643   if (CountCompiledCalls) {
2644     if (UseCounterDecay) {
2645       warning("UseCounterDecay disabled because CountCalls is set");
2646       UseCounterDecay = false;
2647     }
2648   }
2649 #endif // PRODUCT
2650 
2651   if (EnableInvokeDynamic && !EnableMethodHandles) {
2652     if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
2653       warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
2654     }
2655     EnableMethodHandles = true;
2656   }
2657   if (EnableMethodHandles && !AnonymousClasses) {
2658     if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
2659       warning("forcing AnonymousClasses true because EnableMethodHandles is true");
2660     }
2661     AnonymousClasses = true;
2662   }
2663   if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
2664     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
2665       warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
2666     }
2667     ScavengeRootsInCode = 1;
2668   }
2669 
2670   if (PrintGCDetails) {
2671     // Turn on -verbose:gc options as well
2672     PrintGC = true;
2673     if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
2674       TraceClassUnloading = true;
2675     }
2676   }
2677 
2678 #ifdef SERIALGC
2679   set_serial_gc_flags();
2680 #endif // SERIALGC
2681 #ifdef KERNEL
2682   no_shared_spaces();
2683 #endif // KERNEL
2684 
2685   // Set flags based on ergonomics.
2686   set_ergonomics_flags();
2687 
2688   // Check the GC selections again.
2689   if (!check_gc_consistency()) {
2690     return JNI_EINVAL;
2691   }
2692 
2693   if (UseParallelGC || UseParallelOldGC) {
2694     // Set some flags for ParallelGC if needed.
2695     set_parallel_gc_flags();
2696   } else if (UseConcMarkSweepGC) {
2697     // Set some flags for CMS
2698     set_cms_and_parnew_gc_flags();
2699   } else if (UseParNewGC) {
2700     // Set some flags for ParNew
2701     set_parnew_gc_flags();
2702   } else if (UseG1GC) {
2703     // Set some flags for garbage-first, if needed.
2704     set_g1_gc_flags();
2705   }
2706 
2707 #ifdef SERIALGC
2708   assert(verify_serial_gc_flags(), "SerialGC unset");
2709 #endif // SERIALGC
2710 
2711   // Set bytecode rewriting flags
2712   set_bytecode_flags();
2713 
2714   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2715   set_aggressive_opts_flags();
2716 
2717 #ifdef CC_INTERP
2718   // Biased locking is not implemented with c++ interpreter
2719   FLAG_SET_DEFAULT(UseBiasedLocking, false);
2720 #endif /* CC_INTERP */
2721 
2722 #ifdef COMPILER2
2723   if (!UseBiasedLocking || EmitSync != 0) {
2724     UseOptoBiasInlining = false;
2725   }
2726 #endif
2727 
2728   if (PrintCommandLineFlags) {
2729     CommandLineFlags::printSetFlags();
2730   }
2731 
2732 #ifdef ASSERT
2733   if (PrintFlagsFinal) {
2734     CommandLineFlags::printFlags();
2735   }
2736 #endif
2737 
2738   return JNI_OK;
2739 }
2740 
2741 int Arguments::PropertyList_count(SystemProperty* pl) {
2742   int count = 0;
2743   while(pl != NULL) {
2744     count++;
2745     pl = pl->next();
2746   }
2747   return count;
2748 }
2749 
2750 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2751   assert(key != NULL, "just checking");
2752   SystemProperty* prop;
2753   for (prop = pl; prop != NULL; prop = prop->next()) {
2754     if (strcmp(key, prop->key()) == 0) return prop->value();
2755   }
2756   return NULL;
2757 }
2758 
2759 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2760   int count = 0;
2761   const char* ret_val = NULL;
2762 
2763   while(pl != NULL) {
2764     if(count >= index) {
2765       ret_val = pl->key();
2766       break;
2767     }
2768     count++;
2769     pl = pl->next();
2770   }
2771 
2772   return ret_val;
2773 }
2774 
2775 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2776   int count = 0;
2777   char* ret_val = NULL;
2778 
2779   while(pl != NULL) {
2780     if(count >= index) {
2781       ret_val = pl->value();
2782       break;
2783     }
2784     count++;
2785     pl = pl->next();
2786   }
2787 
2788   return ret_val;
2789 }
2790 
2791 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2792   SystemProperty* p = *plist;
2793   if (p == NULL) {
2794     *plist = new_p;
2795   } else {
2796     while (p->next() != NULL) {
2797       p = p->next();
2798     }
2799     p->set_next(new_p);
2800   }
2801 }
2802 
2803 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2804   if (plist == NULL)
2805     return;
2806 
2807   SystemProperty* new_p = new SystemProperty(k, v, true);
2808   PropertyList_add(plist, new_p);
2809 }
2810 
2811 // This add maintains unique property key in the list.
2812 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
2813   if (plist == NULL)
2814     return;
2815 
2816   // If property key exist then update with new value.
2817   SystemProperty* prop;
2818   for (prop = *plist; prop != NULL; prop = prop->next()) {
2819     if (strcmp(k, prop->key()) == 0) {
2820       if (append) {
2821         prop->append_value(v);
2822       } else {
2823         prop->set_value(v);
2824       }
2825       return;
2826     }
2827   }
2828 
2829   PropertyList_add(plist, k, v);
2830 }
2831 
2832 #ifdef KERNEL
2833 char *Arguments::get_kernel_properties() {
2834   // Find properties starting with kernel and append them to string
2835   // We need to find out how long they are first because the URL's that they
2836   // might point to could get long.
2837   int length = 0;
2838   SystemProperty* prop;
2839   for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2840     if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2841       length += (strlen(prop->key()) + strlen(prop->value()) + 5);  // "-D ="
2842     }
2843   }
2844   // Add one for null terminator.
2845   char *props = AllocateHeap(length + 1, "get_kernel_properties");
2846   if (length != 0) {
2847     int pos = 0;
2848     for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2849       if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2850         jio_snprintf(&props[pos], length-pos,
2851                      "-D%s=%s ", prop->key(), prop->value());
2852         pos = strlen(props);
2853       }
2854     }
2855   }
2856   // null terminate props in case of null
2857   props[length] = '\0';
2858   return props;
2859 }
2860 #endif // KERNEL
2861 
2862 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2863 // Returns true if all of the source pointed by src has been copied over to
2864 // the destination buffer pointed by buf. Otherwise, returns false.
2865 // Notes:
2866 // 1. If the length (buflen) of the destination buffer excluding the
2867 // NULL terminator character is not long enough for holding the expanded
2868 // pid characters, it also returns false instead of returning the partially
2869 // expanded one.
2870 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2871 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2872                                 char* buf, size_t buflen) {
2873   const char* p = src;
2874   char* b = buf;
2875   const char* src_end = &src[srclen];
2876   char* buf_end = &buf[buflen - 1];
2877 
2878   while (p < src_end && b < buf_end) {
2879     if (*p == '%') {
2880       switch (*(++p)) {
2881       case '%':         // "%%" ==> "%"
2882         *b++ = *p++;
2883         break;
2884       case 'p':  {       //  "%p" ==> current process id
2885         // buf_end points to the character before the last character so
2886         // that we could write '\0' to the end of the buffer.
2887         size_t buf_sz = buf_end - b + 1;
2888         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2889 
2890         // if jio_snprintf fails or the buffer is not long enough to hold
2891         // the expanded pid, returns false.
2892         if (ret < 0 || ret >= (int)buf_sz) {
2893           return false;
2894         } else {
2895           b += ret;
2896           assert(*b == '\0', "fail in copy_expand_pid");
2897           if (p == src_end && b == buf_end + 1) {
2898             // reach the end of the buffer.
2899             return true;
2900           }
2901         }
2902         p++;
2903         break;
2904       }
2905       default :
2906         *b++ = '%';
2907       }
2908     } else {
2909       *b++ = *p++;
2910     }
2911   }
2912   *b = '\0';
2913   return (p == src_end); // return false if not all of the source was copied
2914 }