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