1 /*
   2  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/javaAssertions.hpp"
  27 #include "compiler/compilerOracle.hpp"
  28 #include "memory/allocation.inline.hpp"
  29 #include "memory/cardTableRS.hpp"
  30 #include "memory/referenceProcessor.hpp"
  31 #include "memory/universe.inline.hpp"
  32 #include "oops/oop.inline.hpp"
  33 #include "prims/jvmtiExport.hpp"
  34 #include "runtime/arguments.hpp"
  35 #include "runtime/globals_extension.hpp"
  36 #include "runtime/java.hpp"
  37 #include "services/management.hpp"
  38 #include "utilities/defaultStream.hpp"
  39 #include "utilities/taskqueue.hpp"
  40 #ifdef TARGET_ARCH_x86
  41 # include "vm_version_x86.hpp"
  42 #endif
  43 #ifdef TARGET_ARCH_sparc
  44 # include "vm_version_sparc.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_zero
  47 # include "vm_version_zero.hpp"
  48 #endif
  49 #ifdef TARGET_OS_FAMILY_linux
  50 # include "os_linux.inline.hpp"
  51 #endif
  52 #ifdef TARGET_OS_FAMILY_solaris
  53 # include "os_solaris.inline.hpp"
  54 #endif
  55 #ifdef TARGET_OS_FAMILY_windows
  56 # include "os_windows.inline.hpp"
  57 #endif
  58 #ifndef SERIALGC
  59 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  60 #endif
  61 
  62 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
  63 #define DEFAULT_JAVA_LAUNCHER  "generic"
  64 
  65 char**  Arguments::_jvm_flags_array             = NULL;
  66 int     Arguments::_num_jvm_flags               = 0;
  67 char**  Arguments::_jvm_args_array              = NULL;
  68 int     Arguments::_num_jvm_args                = 0;
  69 char*  Arguments::_java_command                 = NULL;
  70 SystemProperty* Arguments::_system_properties   = NULL;
  71 const char*  Arguments::_gc_log_filename        = NULL;
  72 bool   Arguments::_has_profile                  = false;
  73 bool   Arguments::_has_alloc_profile            = false;
  74 uintx  Arguments::_min_heap_size                = 0;
  75 Arguments::Mode Arguments::_mode                = _mixed;
  76 bool   Arguments::_java_compiler                = false;
  77 bool   Arguments::_xdebug_mode                  = false;
  78 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  79 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  80 int    Arguments::_sun_java_launcher_pid        = -1;
  81 bool   Arguments::_created_by_gamma_launcher    = false;
  82 
  83 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
  84 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  85 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  86 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  87 bool   Arguments::_ClipInlining                 = ClipInlining;
  88 
  89 char*  Arguments::SharedArchivePath             = NULL;
  90 
  91 AgentLibraryList Arguments::_libraryList;
  92 AgentLibraryList Arguments::_agentList;
  93 
  94 abort_hook_t     Arguments::_abort_hook         = NULL;
  95 exit_hook_t      Arguments::_exit_hook          = NULL;
  96 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
  97 
  98 
  99 SystemProperty *Arguments::_java_ext_dirs = NULL;
 100 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
 101 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 102 SystemProperty *Arguments::_java_library_path = NULL;
 103 SystemProperty *Arguments::_java_home = NULL;
 104 SystemProperty *Arguments::_java_class_path = NULL;
 105 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 106 
 107 char* Arguments::_meta_index_path = NULL;
 108 char* Arguments::_meta_index_dir = NULL;
 109 
 110 static bool force_client_mode = false;
 111 
 112 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
 113 
 114 static bool match_option(const JavaVMOption *option, const char* name,
 115                          const char** tail) {
 116   int len = (int)strlen(name);
 117   if (strncmp(option->optionString, name, len) == 0) {
 118     *tail = option->optionString + len;
 119     return true;
 120   } else {
 121     return false;
 122   }
 123 }
 124 
 125 static void logOption(const char* opt) {
 126   if (PrintVMOptions) {
 127     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 128   }
 129 }
 130 
 131 // Process java launcher properties.
 132 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 133   // See if sun.java.launcher or sun.java.launcher.pid is defined.
 134   // Must do this before setting up other system properties,
 135   // as some of them may depend on launcher type.
 136   for (int index = 0; index < args->nOptions; index++) {
 137     const JavaVMOption* option = args->options + index;
 138     const char* tail;
 139 
 140     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 141       process_java_launcher_argument(tail, option->extraInfo);
 142       continue;
 143     }
 144     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 145       _sun_java_launcher_pid = atoi(tail);
 146       continue;
 147     }
 148   }
 149 }
 150 
 151 // Initialize system properties key and value.
 152 void Arguments::init_system_properties() {
 153 
 154   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 155                                                                  "Java Virtual Machine Specification",  false));
 156   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 157   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 158   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 159 
 160   // following are JVMTI agent writeable properties.
 161   // Properties values are set to NULL and they are
 162   // os specific they are initialized in os::init_system_properties_values().
 163   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 164   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 165   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 166   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 167   _java_home =  new SystemProperty("java.home", NULL,  true);
 168   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 169 
 170   _java_class_path = new SystemProperty("java.class.path", "",  true);
 171 
 172   // Add to System Property list.
 173   PropertyList_add(&_system_properties, _java_ext_dirs);
 174   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 175   PropertyList_add(&_system_properties, _sun_boot_library_path);
 176   PropertyList_add(&_system_properties, _java_library_path);
 177   PropertyList_add(&_system_properties, _java_home);
 178   PropertyList_add(&_system_properties, _java_class_path);
 179   PropertyList_add(&_system_properties, _sun_boot_class_path);
 180 
 181   // Set OS specific system properties values
 182   os::init_system_properties_values();
 183 }
 184 
 185 
 186   // Update/Initialize System properties after JDK version number is known
 187 void Arguments::init_version_specific_system_properties() {
 188   enum { bufsz = 16 };
 189   char buffer[bufsz];
 190   const char* spec_vendor = "Sun Microsystems Inc.";
 191   uint32_t spec_version = 0;
 192 
 193   if (JDK_Version::is_gte_jdk17x_version()) {
 194     spec_vendor = "Oracle Corporation";
 195     spec_version = JDK_Version::current().major_version();
 196   }
 197   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 198 
 199   PropertyList_add(&_system_properties,
 200       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 201   PropertyList_add(&_system_properties,
 202       new SystemProperty("java.vm.specification.version", buffer, false));
 203   PropertyList_add(&_system_properties,
 204       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 205 }
 206 
 207 /**
 208  * Provide a slightly more user-friendly way of eliminating -XX flags.
 209  * When a flag is eliminated, it can be added to this list in order to
 210  * continue accepting this flag on the command-line, while issuing a warning
 211  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 212  * limit, we flatly refuse to admit the existence of the flag.  This allows
 213  * a flag to die correctly over JDK releases using HSX.
 214  */
 215 typedef struct {
 216   const char* name;
 217   JDK_Version obsoleted_in; // when the flag went away
 218   JDK_Version accept_until; // which version to start denying the existence
 219 } ObsoleteFlag;
 220 
 221 static ObsoleteFlag obsolete_jvm_flags[] = {
 222   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 223   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 224   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 225   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 226   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 227   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 228   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 229   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 230   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 231   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 232   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 233   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 234   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 235   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 236   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 237   { "DefaultInitialRAMFraction",
 238                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 239   { "UseDepthFirstScavengeOrder",
 240                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 241   { "HandlePromotionFailure",
 242                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 243   { "MaxLiveObjectEvacuationRatio",
 244                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 245   { NULL, JDK_Version(0), JDK_Version(0) }
 246 };
 247 
 248 // Returns true if the flag is obsolete and fits into the range specified
 249 // for being ignored.  In the case that the flag is ignored, the 'version'
 250 // value is filled in with the version number when the flag became
 251 // obsolete so that that value can be displayed to the user.
 252 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 253   int i = 0;
 254   assert(version != NULL, "Must provide a version buffer");
 255   while (obsolete_jvm_flags[i].name != NULL) {
 256     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 257     // <flag>=xxx form
 258     // [-|+]<flag> form
 259     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 260         ((s[0] == '+' || s[0] == '-') &&
 261         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 262       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 263           *version = flag_status.obsoleted_in;
 264           return true;
 265       }
 266     }
 267     i++;
 268   }
 269   return false;
 270 }
 271 
 272 // Constructs the system class path (aka boot class path) from the following
 273 // components, in order:
 274 //
 275 //     prefix           // from -Xbootclasspath/p:...
 276 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 277 //     base             // from os::get_system_properties() or -Xbootclasspath=
 278 //     suffix           // from -Xbootclasspath/a:...
 279 //
 280 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 281 // directories are added to the sysclasspath just before the base.
 282 //
 283 // This could be AllStatic, but it isn't needed after argument processing is
 284 // complete.
 285 class SysClassPath: public StackObj {
 286 public:
 287   SysClassPath(const char* base);
 288   ~SysClassPath();
 289 
 290   inline void set_base(const char* base);
 291   inline void add_prefix(const char* prefix);
 292   inline void add_suffix_to_prefix(const char* suffix);
 293   inline void add_suffix(const char* suffix);
 294   inline void reset_path(const char* base);
 295 
 296   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 297   // property.  Must be called after all command-line arguments have been
 298   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 299   // combined_path().
 300   void expand_endorsed();
 301 
 302   inline const char* get_base()     const { return _items[_scp_base]; }
 303   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 304   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 305   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 306 
 307   // Combine all the components into a single c-heap-allocated string; caller
 308   // must free the string if/when no longer needed.
 309   char* combined_path();
 310 
 311 private:
 312   // Utility routines.
 313   static char* add_to_path(const char* path, const char* str, bool prepend);
 314   static char* add_jars_to_path(char* path, const char* directory);
 315 
 316   inline void reset_item_at(int index);
 317 
 318   // Array indices for the items that make up the sysclasspath.  All except the
 319   // base are allocated in the C heap and freed by this class.
 320   enum {
 321     _scp_prefix,        // from -Xbootclasspath/p:...
 322     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 323     _scp_base,          // the default sysclasspath
 324     _scp_suffix,        // from -Xbootclasspath/a:...
 325     _scp_nitems         // the number of items, must be last.
 326   };
 327 
 328   const char* _items[_scp_nitems];
 329   DEBUG_ONLY(bool _expansion_done;)
 330 };
 331 
 332 SysClassPath::SysClassPath(const char* base) {
 333   memset(_items, 0, sizeof(_items));
 334   _items[_scp_base] = base;
 335   DEBUG_ONLY(_expansion_done = false;)
 336 }
 337 
 338 SysClassPath::~SysClassPath() {
 339   // Free everything except the base.
 340   for (int i = 0; i < _scp_nitems; ++i) {
 341     if (i != _scp_base) reset_item_at(i);
 342   }
 343   DEBUG_ONLY(_expansion_done = false;)
 344 }
 345 
 346 inline void SysClassPath::set_base(const char* base) {
 347   _items[_scp_base] = base;
 348 }
 349 
 350 inline void SysClassPath::add_prefix(const char* prefix) {
 351   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 352 }
 353 
 354 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 355   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 356 }
 357 
 358 inline void SysClassPath::add_suffix(const char* suffix) {
 359   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 360 }
 361 
 362 inline void SysClassPath::reset_item_at(int index) {
 363   assert(index < _scp_nitems && index != _scp_base, "just checking");
 364   if (_items[index] != NULL) {
 365     FREE_C_HEAP_ARRAY(char, _items[index]);
 366     _items[index] = NULL;
 367   }
 368 }
 369 
 370 inline void SysClassPath::reset_path(const char* base) {
 371   // Clear the prefix and suffix.
 372   reset_item_at(_scp_prefix);
 373   reset_item_at(_scp_suffix);
 374   set_base(base);
 375 }
 376 
 377 //------------------------------------------------------------------------------
 378 
 379 void SysClassPath::expand_endorsed() {
 380   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 381 
 382   const char* path = Arguments::get_property("java.endorsed.dirs");
 383   if (path == NULL) {
 384     path = Arguments::get_endorsed_dir();
 385     assert(path != NULL, "no default for java.endorsed.dirs");
 386   }
 387 
 388   char* expanded_path = NULL;
 389   const char separator = *os::path_separator();
 390   const char* const end = path + strlen(path);
 391   while (path < end) {
 392     const char* tmp_end = strchr(path, separator);
 393     if (tmp_end == NULL) {
 394       expanded_path = add_jars_to_path(expanded_path, path);
 395       path = end;
 396     } else {
 397       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
 398       memcpy(dirpath, path, tmp_end - path);
 399       dirpath[tmp_end - path] = '\0';
 400       expanded_path = add_jars_to_path(expanded_path, dirpath);
 401       FREE_C_HEAP_ARRAY(char, dirpath);
 402       path = tmp_end + 1;
 403     }
 404   }
 405   _items[_scp_endorsed] = expanded_path;
 406   DEBUG_ONLY(_expansion_done = true;)
 407 }
 408 
 409 // Combine the bootclasspath elements, some of which may be null, into a single
 410 // c-heap-allocated string.
 411 char* SysClassPath::combined_path() {
 412   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 413   assert(_expansion_done, "must call expand_endorsed() first.");
 414 
 415   size_t lengths[_scp_nitems];
 416   size_t total_len = 0;
 417 
 418   const char separator = *os::path_separator();
 419 
 420   // Get the lengths.
 421   int i;
 422   for (i = 0; i < _scp_nitems; ++i) {
 423     if (_items[i] != NULL) {
 424       lengths[i] = strlen(_items[i]);
 425       // Include space for the separator char (or a NULL for the last item).
 426       total_len += lengths[i] + 1;
 427     }
 428   }
 429   assert(total_len > 0, "empty sysclasspath not allowed");
 430 
 431   // Copy the _items to a single string.
 432   char* cp = NEW_C_HEAP_ARRAY(char, total_len);
 433   char* cp_tmp = cp;
 434   for (i = 0; i < _scp_nitems; ++i) {
 435     if (_items[i] != NULL) {
 436       memcpy(cp_tmp, _items[i], lengths[i]);
 437       cp_tmp += lengths[i];
 438       *cp_tmp++ = separator;
 439     }
 440   }
 441   *--cp_tmp = '\0';     // Replace the extra separator.
 442   return cp;
 443 }
 444 
 445 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 446 char*
 447 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 448   char *cp;
 449 
 450   assert(str != NULL, "just checking");
 451   if (path == NULL) {
 452     size_t len = strlen(str) + 1;
 453     cp = NEW_C_HEAP_ARRAY(char, len);
 454     memcpy(cp, str, len);                       // copy the trailing null
 455   } else {
 456     const char separator = *os::path_separator();
 457     size_t old_len = strlen(path);
 458     size_t str_len = strlen(str);
 459     size_t len = old_len + str_len + 2;
 460 
 461     if (prepend) {
 462       cp = NEW_C_HEAP_ARRAY(char, len);
 463       char* cp_tmp = cp;
 464       memcpy(cp_tmp, str, str_len);
 465       cp_tmp += str_len;
 466       *cp_tmp = separator;
 467       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 468       FREE_C_HEAP_ARRAY(char, path);
 469     } else {
 470       cp = REALLOC_C_HEAP_ARRAY(char, path, len);
 471       char* cp_tmp = cp + old_len;
 472       *cp_tmp = separator;
 473       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 474     }
 475   }
 476   return cp;
 477 }
 478 
 479 // Scan the directory and append any jar or zip files found to path.
 480 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 481 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 482   DIR* dir = os::opendir(directory);
 483   if (dir == NULL) return path;
 484 
 485   char dir_sep[2] = { '\0', '\0' };
 486   size_t directory_len = strlen(directory);
 487   const char fileSep = *os::file_separator();
 488   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 489 
 490   /* Scan the directory for jars/zips, appending them to path. */
 491   struct dirent *entry;
 492   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
 493   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 494     const char* name = entry->d_name;
 495     const char* ext = name + strlen(name) - 4;
 496     bool isJarOrZip = ext > name &&
 497       (os::file_name_strcmp(ext, ".jar") == 0 ||
 498        os::file_name_strcmp(ext, ".zip") == 0);
 499     if (isJarOrZip) {
 500       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
 501       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 502       path = add_to_path(path, jarpath, false);
 503       FREE_C_HEAP_ARRAY(char, jarpath);
 504     }
 505   }
 506   FREE_C_HEAP_ARRAY(char, dbuf);
 507   os::closedir(dir);
 508   return path;
 509 }
 510 
 511 // Parses a memory size specification string.
 512 static bool atomull(const char *s, julong* result) {
 513   julong n = 0;
 514   int args_read = sscanf(s, os::julong_format_specifier(), &n);
 515   if (args_read != 1) {
 516     return false;
 517   }
 518   while (*s != '\0' && isdigit(*s)) {
 519     s++;
 520   }
 521   // 4705540: illegal if more characters are found after the first non-digit
 522   if (strlen(s) > 1) {
 523     return false;
 524   }
 525   switch (*s) {
 526     case 'T': case 't':
 527       *result = n * G * K;
 528       // Check for overflow.
 529       if (*result/((julong)G * K) != n) return false;
 530       return true;
 531     case 'G': case 'g':
 532       *result = n * G;
 533       if (*result/G != n) return false;
 534       return true;
 535     case 'M': case 'm':
 536       *result = n * M;
 537       if (*result/M != n) return false;
 538       return true;
 539     case 'K': case 'k':
 540       *result = n * K;
 541       if (*result/K != n) return false;
 542       return true;
 543     case '\0':
 544       *result = n;
 545       return true;
 546     default:
 547       return false;
 548   }
 549 }
 550 
 551 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 552   if (size < min_size) return arg_too_small;
 553   // Check that size will fit in a size_t (only relevant on 32-bit)
 554   if (size > max_uintx) return arg_too_big;
 555   return arg_in_range;
 556 }
 557 
 558 // Describe an argument out of range error
 559 void Arguments::describe_range_error(ArgsRange errcode) {
 560   switch(errcode) {
 561   case arg_too_big:
 562     jio_fprintf(defaultStream::error_stream(),
 563                 "The specified size exceeds the maximum "
 564                 "representable size.\n");
 565     break;
 566   case arg_too_small:
 567   case arg_unreadable:
 568   case arg_in_range:
 569     // do nothing for now
 570     break;
 571   default:
 572     ShouldNotReachHere();
 573   }
 574 }
 575 
 576 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
 577   return CommandLineFlags::boolAtPut(name, &value, origin);
 578 }
 579 
 580 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
 581   double v;
 582   if (sscanf(value, "%lf", &v) != 1) {
 583     return false;
 584   }
 585 
 586   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 587     return true;
 588   }
 589   return false;
 590 }
 591 
 592 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
 593   julong v;
 594   intx intx_v;
 595   bool is_neg = false;
 596   // Check the sign first since atomull() parses only unsigned values.
 597   if (*value == '-') {
 598     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 599       return false;
 600     }
 601     value++;
 602     is_neg = true;
 603   }
 604   if (!atomull(value, &v)) {
 605     return false;
 606   }
 607   intx_v = (intx) v;
 608   if (is_neg) {
 609     intx_v = -intx_v;
 610   }
 611   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 612     return true;
 613   }
 614   uintx uintx_v = (uintx) v;
 615   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 616     return true;
 617   }
 618   uint64_t uint64_t_v = (uint64_t) v;
 619   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 620     return true;
 621   }
 622   return false;
 623 }
 624 
 625 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
 626   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 627   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 628   FREE_C_HEAP_ARRAY(char, value);
 629   return true;
 630 }
 631 
 632 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
 633   const char* old_value = "";
 634   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 635   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 636   size_t new_len = strlen(new_value);
 637   const char* value;
 638   char* free_this_too = NULL;
 639   if (old_len == 0) {
 640     value = new_value;
 641   } else if (new_len == 0) {
 642     value = old_value;
 643   } else {
 644     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
 645     // each new setting adds another LINE to the switch:
 646     sprintf(buf, "%s\n%s", old_value, new_value);
 647     value = buf;
 648     free_this_too = buf;
 649   }
 650   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 651   // CommandLineFlags always returns a pointer that needs freeing.
 652   FREE_C_HEAP_ARRAY(char, value);
 653   if (free_this_too != NULL) {
 654     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 655     FREE_C_HEAP_ARRAY(char, free_this_too);
 656   }
 657   return true;
 658 }
 659 
 660 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
 661 
 662   // range of acceptable characters spelled out for portability reasons
 663 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 664 #define BUFLEN 255
 665   char name[BUFLEN+1];
 666   char dummy;
 667 
 668   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 669     return set_bool_flag(name, false, origin);
 670   }
 671   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 672     return set_bool_flag(name, true, origin);
 673   }
 674 
 675   char punct;
 676   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 677     const char* value = strchr(arg, '=') + 1;
 678     Flag* flag = Flag::find_flag(name, strlen(name));
 679     if (flag != NULL && flag->is_ccstr()) {
 680       if (flag->ccstr_accumulates()) {
 681         return append_to_string_flag(name, value, origin);
 682       } else {
 683         if (value[0] == '\0') {
 684           value = NULL;
 685         }
 686         return set_string_flag(name, value, origin);
 687       }
 688     }
 689   }
 690 
 691   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 692     const char* value = strchr(arg, '=') + 1;
 693     // -XX:Foo:=xxx will reset the string flag to the given value.
 694     if (value[0] == '\0') {
 695       value = NULL;
 696     }
 697     return set_string_flag(name, value, origin);
 698   }
 699 
 700 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 701 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 702 #define        NUMBER_RANGE    "[0123456789]"
 703   char value[BUFLEN + 1];
 704   char value2[BUFLEN + 1];
 705   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 706     // Looks like a floating-point number -- try again with more lenient format string
 707     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 708       return set_fp_numeric_flag(name, value, origin);
 709     }
 710   }
 711 
 712 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 713   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 714     return set_numeric_flag(name, value, origin);
 715   }
 716 
 717   return false;
 718 }
 719 
 720 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 721   assert(bldarray != NULL, "illegal argument");
 722 
 723   if (arg == NULL) {
 724     return;
 725   }
 726 
 727   int index = *count;
 728 
 729   // expand the array and add arg to the last element
 730   (*count)++;
 731   if (*bldarray == NULL) {
 732     *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
 733   } else {
 734     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
 735   }
 736   (*bldarray)[index] = strdup(arg);
 737 }
 738 
 739 void Arguments::build_jvm_args(const char* arg) {
 740   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 741 }
 742 
 743 void Arguments::build_jvm_flags(const char* arg) {
 744   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 745 }
 746 
 747 // utility function to return a string that concatenates all
 748 // strings in a given char** array
 749 const char* Arguments::build_resource_string(char** args, int count) {
 750   if (args == NULL || count == 0) {
 751     return NULL;
 752   }
 753   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 754   for (int i = 1; i < count; i++) {
 755     length += strlen(args[i]) + 1; // add 1 for a space
 756   }
 757   char* s = NEW_RESOURCE_ARRAY(char, length);
 758   strcpy(s, args[0]);
 759   for (int j = 1; j < count; j++) {
 760     strcat(s, " ");
 761     strcat(s, args[j]);
 762   }
 763   return (const char*) s;
 764 }
 765 
 766 void Arguments::print_on(outputStream* st) {
 767   st->print_cr("VM Arguments:");
 768   if (num_jvm_flags() > 0) {
 769     st->print("jvm_flags: "); print_jvm_flags_on(st);
 770   }
 771   if (num_jvm_args() > 0) {
 772     st->print("jvm_args: "); print_jvm_args_on(st);
 773   }
 774   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 775   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 776 }
 777 
 778 void Arguments::print_jvm_flags_on(outputStream* st) {
 779   if (_num_jvm_flags > 0) {
 780     for (int i=0; i < _num_jvm_flags; i++) {
 781       st->print("%s ", _jvm_flags_array[i]);
 782     }
 783     st->print_cr("");
 784   }
 785 }
 786 
 787 void Arguments::print_jvm_args_on(outputStream* st) {
 788   if (_num_jvm_args > 0) {
 789     for (int i=0; i < _num_jvm_args; i++) {
 790       st->print("%s ", _jvm_args_array[i]);
 791     }
 792     st->print_cr("");
 793   }
 794 }
 795 
 796 bool Arguments::process_argument(const char* arg,
 797     jboolean ignore_unrecognized, FlagValueOrigin origin) {
 798 
 799   JDK_Version since = JDK_Version();
 800 
 801   if (parse_argument(arg, origin)) {
 802     // do nothing
 803   } else if (is_newly_obsolete(arg, &since)) {
 804     enum { bufsize = 256 };
 805     char buffer[bufsize];
 806     since.to_string(buffer, bufsize);
 807     jio_fprintf(defaultStream::error_stream(),
 808       "Warning: The flag %s has been EOL'd as of %s and will"
 809       " be ignored\n", arg, buffer);
 810   } else {
 811     if (!ignore_unrecognized) {
 812       jio_fprintf(defaultStream::error_stream(),
 813                   "Unrecognized VM option '%s'\n", arg);
 814       // allow for commandline "commenting out" options like -XX:#+Verbose
 815       if (strlen(arg) == 0 || arg[0] != '#') {
 816         return false;
 817       }
 818     }
 819   }
 820   return true;
 821 }
 822 
 823 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 824   FILE* stream = fopen(file_name, "rb");
 825   if (stream == NULL) {
 826     if (should_exist) {
 827       jio_fprintf(defaultStream::error_stream(),
 828                   "Could not open settings file %s\n", file_name);
 829       return false;
 830     } else {
 831       return true;
 832     }
 833   }
 834 
 835   char token[1024];
 836   int  pos = 0;
 837 
 838   bool in_white_space = true;
 839   bool in_comment     = false;
 840   bool in_quote       = false;
 841   char quote_c        = 0;
 842   bool result         = true;
 843 
 844   int c = getc(stream);
 845   while(c != EOF) {
 846     if (in_white_space) {
 847       if (in_comment) {
 848         if (c == '\n') in_comment = false;
 849       } else {
 850         if (c == '#') in_comment = true;
 851         else if (!isspace(c)) {
 852           in_white_space = false;
 853           token[pos++] = c;
 854         }
 855       }
 856     } else {
 857       if (c == '\n' || (!in_quote && isspace(c))) {
 858         // token ends at newline, or at unquoted whitespace
 859         // this allows a way to include spaces in string-valued options
 860         token[pos] = '\0';
 861         logOption(token);
 862         result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
 863         build_jvm_flags(token);
 864         pos = 0;
 865         in_white_space = true;
 866         in_quote = false;
 867       } else if (!in_quote && (c == '\'' || c == '"')) {
 868         in_quote = true;
 869         quote_c = c;
 870       } else if (in_quote && (c == quote_c)) {
 871         in_quote = false;
 872       } else {
 873         token[pos++] = c;
 874       }
 875     }
 876     c = getc(stream);
 877   }
 878   if (pos > 0) {
 879     token[pos] = '\0';
 880     result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
 881     build_jvm_flags(token);
 882   }
 883   fclose(stream);
 884   return result;
 885 }
 886 
 887 //=============================================================================================================
 888 // Parsing of properties (-D)
 889 
 890 const char* Arguments::get_property(const char* key) {
 891   return PropertyList_get_value(system_properties(), key);
 892 }
 893 
 894 bool Arguments::add_property(const char* prop) {
 895   const char* eq = strchr(prop, '=');
 896   char* key;
 897   // ns must be static--its address may be stored in a SystemProperty object.
 898   const static char ns[1] = {0};
 899   char* value = (char *)ns;
 900 
 901   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
 902   key = AllocateHeap(key_len + 1, "add_property");
 903   strncpy(key, prop, key_len);
 904   key[key_len] = '\0';
 905 
 906   if (eq != NULL) {
 907     size_t value_len = strlen(prop) - key_len - 1;
 908     value = AllocateHeap(value_len + 1, "add_property");
 909     strncpy(value, &prop[key_len + 1], value_len + 1);
 910   }
 911 
 912   if (strcmp(key, "java.compiler") == 0) {
 913     process_java_compiler_argument(value);
 914     FreeHeap(key);
 915     if (eq != NULL) {
 916       FreeHeap(value);
 917     }
 918     return true;
 919   } else if (strcmp(key, "sun.java.command") == 0) {
 920     _java_command = value;
 921 
 922     // Record value in Arguments, but let it get passed to Java.
 923   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
 924     // launcher.pid property is private and is processed
 925     // in process_sun_java_launcher_properties();
 926     // the sun.java.launcher property is passed on to the java application
 927     FreeHeap(key);
 928     if (eq != NULL) {
 929       FreeHeap(value);
 930     }
 931     return true;
 932   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
 933     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
 934     // its value without going through the property list or making a Java call.
 935     _java_vendor_url_bug = value;
 936   } else if (strcmp(key, "sun.boot.library.path") == 0) {
 937     PropertyList_unique_add(&_system_properties, key, value, true);
 938     return true;
 939   }
 940   // Create new property and add at the end of the list
 941   PropertyList_unique_add(&_system_properties, key, value);
 942   return true;
 943 }
 944 
 945 //===========================================================================================================
 946 // Setting int/mixed/comp mode flags
 947 
 948 void Arguments::set_mode_flags(Mode mode) {
 949   // Set up default values for all flags.
 950   // If you add a flag to any of the branches below,
 951   // add a default value for it here.
 952   set_java_compiler(false);
 953   _mode                      = mode;
 954 
 955   // Ensure Agent_OnLoad has the correct initial values.
 956   // This may not be the final mode; mode may change later in onload phase.
 957   PropertyList_unique_add(&_system_properties, "java.vm.info",
 958                           (char*)Abstract_VM_Version::vm_info_string(), false);
 959 
 960   UseInterpreter             = true;
 961   UseCompiler                = true;
 962   UseLoopCounter             = true;
 963 
 964   // Default values may be platform/compiler dependent -
 965   // use the saved values
 966   ClipInlining               = Arguments::_ClipInlining;
 967   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
 968   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
 969   BackgroundCompilation      = Arguments::_BackgroundCompilation;
 970 
 971   // Change from defaults based on mode
 972   switch (mode) {
 973   default:
 974     ShouldNotReachHere();
 975     break;
 976   case _int:
 977     UseCompiler              = false;
 978     UseLoopCounter           = false;
 979     AlwaysCompileLoopMethods = false;
 980     UseOnStackReplacement    = false;
 981     break;
 982   case _mixed:
 983     // same as default
 984     break;
 985   case _comp:
 986     UseInterpreter           = false;
 987     BackgroundCompilation    = false;
 988     ClipInlining             = false;
 989     break;
 990   }
 991 }
 992 
 993 // Conflict: required to use shared spaces (-Xshare:on), but
 994 // incompatible command line options were chosen.
 995 
 996 static void no_shared_spaces() {
 997   if (RequireSharedSpaces) {
 998     jio_fprintf(defaultStream::error_stream(),
 999       "Class data sharing is inconsistent with other specified options.\n");
1000     vm_exit_during_initialization("Unable to use shared archive.", NULL);
1001   } else {
1002     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1003   }
1004 }
1005 
1006 void Arguments::check_compressed_oops_compat() {
1007 #ifdef _LP64
1008   assert(UseCompressedOops, "Precondition");
1009   // Is it on by default or set on ergonomically
1010   bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops);
1011 
1012   // If dumping an archive or forcing its use, disable compressed oops if possible
1013   if (DumpSharedSpaces || RequireSharedSpaces) {
1014     if (is_on_by_default) {
1015       FLAG_SET_DEFAULT(UseCompressedOops, false);
1016       return;
1017     } else {
1018       vm_exit_during_initialization(
1019         "Class Data Sharing is not supported with compressed oops yet", NULL);
1020     }
1021   } else if (UseSharedSpaces) {
1022     // UseSharedSpaces is on by default. With compressed oops, we turn it off.
1023     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1024   }
1025 #endif
1026 }
1027 
1028 void Arguments::set_tiered_flags() {
1029   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1030     FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
1031   }
1032   if (CompilationPolicyChoice < 2) {
1033     vm_exit_during_initialization(
1034       "Incompatible compilation policy selected", NULL);
1035   }
1036   // Increase the code cache size - tiered compiles a lot more.
1037   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1038     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1039   }
1040 }
1041 
1042 #ifndef KERNEL
1043 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1044 // if it's not explictly set or unset. If the user has chosen
1045 // UseParNewGC and not explicitly set ParallelGCThreads we
1046 // set it, unless this is a single cpu machine.
1047 void Arguments::set_parnew_gc_flags() {
1048   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1049          "control point invariant");
1050   assert(UseParNewGC, "Error");
1051 
1052   // Turn off AdaptiveSizePolicy by default for parnew until it is
1053   // complete.
1054   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1055     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1056   }
1057 
1058   if (ParallelGCThreads == 0) {
1059     FLAG_SET_DEFAULT(ParallelGCThreads,
1060                      Abstract_VM_Version::parallel_worker_threads());
1061     if (ParallelGCThreads == 1) {
1062       FLAG_SET_DEFAULT(UseParNewGC, false);
1063       FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1064     }
1065   }
1066   if (UseParNewGC) {
1067     // CDS doesn't work with ParNew yet
1068     no_shared_spaces();
1069 
1070     // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1071     // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1072     // we set them to 1024 and 1024.
1073     // See CR 6362902.
1074     if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1075       FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1076     }
1077     if (FLAG_IS_DEFAULT(OldPLABSize)) {
1078       FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1079     }
1080 
1081     // AlwaysTenure flag should make ParNew promote all at first collection.
1082     // See CR 6362902.
1083     if (AlwaysTenure) {
1084       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1085     }
1086     // When using compressed oops, we use local overflow stacks,
1087     // rather than using a global overflow list chained through
1088     // the klass word of the object's pre-image.
1089     if (UseCompressedOops && !ParGCUseLocalOverflow) {
1090       if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1091         warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1092       }
1093       FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1094     }
1095     assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1096   }
1097 }
1098 
1099 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1100 // sparc/solaris for certain applications, but would gain from
1101 // further optimization and tuning efforts, and would almost
1102 // certainly gain from analysis of platform and environment.
1103 void Arguments::set_cms_and_parnew_gc_flags() {
1104   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1105   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1106 
1107   // If we are using CMS, we prefer to UseParNewGC,
1108   // unless explicitly forbidden.
1109   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1110     FLAG_SET_ERGO(bool, UseParNewGC, true);
1111   }
1112 
1113   // Turn off AdaptiveSizePolicy by default for cms until it is
1114   // complete.
1115   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1116     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1117   }
1118 
1119   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1120   // as needed.
1121   if (UseParNewGC) {
1122     set_parnew_gc_flags();
1123   }
1124 
1125   // Now make adjustments for CMS
1126   size_t young_gen_per_worker;
1127   intx new_ratio;
1128   size_t min_new_default;
1129   intx tenuring_default;
1130   if (CMSUseOldDefaults) {  // old defaults: "old" as of 6.0
1131     if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1132       FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1133     }
1134     young_gen_per_worker = 4*M;
1135     new_ratio = (intx)15;
1136     min_new_default = 4*M;
1137     tenuring_default = (intx)0;
1138   } else { // new defaults: "new" as of 6.0
1139     young_gen_per_worker = CMSYoungGenPerWorker;
1140     new_ratio = (intx)7;
1141     min_new_default = 16*M;
1142     tenuring_default = (intx)4;
1143   }
1144 
1145   // Preferred young gen size for "short" pauses
1146   const uintx parallel_gc_threads =
1147     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1148   const size_t preferred_max_new_size_unaligned =
1149     ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1150   const size_t preferred_max_new_size =
1151     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1152 
1153   // Unless explicitly requested otherwise, size young gen
1154   // for "short" pauses ~ 4M*ParallelGCThreads
1155 
1156   // If either MaxNewSize or NewRatio is set on the command line,
1157   // assume the user is trying to set the size of the young gen.
1158 
1159   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1160 
1161     // Set MaxNewSize to our calculated preferred_max_new_size unless
1162     // NewSize was set on the command line and it is larger than
1163     // preferred_max_new_size.
1164     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1165       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1166     } else {
1167       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1168     }
1169     if (PrintGCDetails && Verbose) {
1170       // Too early to use gclog_or_tty
1171       tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1172     }
1173 
1174     // Unless explicitly requested otherwise, prefer a large
1175     // Old to Young gen size so as to shift the collection load
1176     // to the old generation concurrent collector
1177 
1178     // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1179     // then NewSize and OldSize may be calculated.  That would
1180     // generally lead to some differences with ParNewGC for which
1181     // there was no obvious reason.  Also limit to the case where
1182     // MaxNewSize has not been set.
1183 
1184     FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1185 
1186     // Code along this path potentially sets NewSize and OldSize
1187 
1188     // Calculate the desired minimum size of the young gen but if
1189     // NewSize has been set on the command line, use it here since
1190     // it should be the final value.
1191     size_t min_new;
1192     if (FLAG_IS_DEFAULT(NewSize)) {
1193       min_new = align_size_up(ScaleForWordSize(min_new_default),
1194                               os::vm_page_size());
1195     } else {
1196       min_new = NewSize;
1197     }
1198     size_t prev_initial_size = InitialHeapSize;
1199     if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1200       FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1201       // Currently minimum size and the initial heap sizes are the same.
1202       set_min_heap_size(InitialHeapSize);
1203       if (PrintGCDetails && Verbose) {
1204         warning("Initial heap size increased to " SIZE_FORMAT " M from "
1205                 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1206                 InitialHeapSize/M, prev_initial_size/M);
1207       }
1208     }
1209 
1210     // MaxHeapSize is aligned down in collectorPolicy
1211     size_t max_heap =
1212       align_size_down(MaxHeapSize,
1213                       CardTableRS::ct_max_alignment_constraint());
1214 
1215     if (PrintGCDetails && Verbose) {
1216       // Too early to use gclog_or_tty
1217       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1218            " initial_heap_size:  " SIZE_FORMAT
1219            " max_heap: " SIZE_FORMAT,
1220            min_heap_size(), InitialHeapSize, max_heap);
1221     }
1222     if (max_heap > min_new) {
1223       // Unless explicitly requested otherwise, make young gen
1224       // at least min_new, and at most preferred_max_new_size.
1225       if (FLAG_IS_DEFAULT(NewSize)) {
1226         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1227         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1228         if (PrintGCDetails && Verbose) {
1229           // Too early to use gclog_or_tty
1230           tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1231         }
1232       }
1233       // Unless explicitly requested otherwise, size old gen
1234       // so that it's at least 3X of NewSize to begin with;
1235       // later NewRatio will decide how it grows; see above.
1236       if (FLAG_IS_DEFAULT(OldSize)) {
1237         if (max_heap > NewSize) {
1238           FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1239           if (PrintGCDetails && Verbose) {
1240             // Too early to use gclog_or_tty
1241             tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1242           }
1243         }
1244       }
1245     }
1246   }
1247   // Unless explicitly requested otherwise, definitely
1248   // promote all objects surviving "tenuring_default" scavenges.
1249   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1250       FLAG_IS_DEFAULT(SurvivorRatio)) {
1251     FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1252   }
1253   // If we decided above (or user explicitly requested)
1254   // `promote all' (via MaxTenuringThreshold := 0),
1255   // prefer minuscule survivor spaces so as not to waste
1256   // space for (non-existent) survivors
1257   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1258     FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1259   }
1260   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1261   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1262   // This is done in order to make ParNew+CMS configuration to work
1263   // with YoungPLABSize and OldPLABSize options.
1264   // See CR 6362902.
1265   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1266     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1267       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1268       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1269       // the value (either from the command line or ergonomics) of
1270       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1271       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1272     } else {
1273       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1274       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1275       // we'll let it to take precedence.
1276       jio_fprintf(defaultStream::error_stream(),
1277                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1278                   " options are specified for the CMS collector."
1279                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1280     }
1281   }
1282   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1283     // OldPLAB sizing manually turned off: Use a larger default setting,
1284     // unless it was manually specified. This is because a too-low value
1285     // will slow down scavenges.
1286     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1287       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1288     }
1289   }
1290   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1291   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1292   // If either of the static initialization defaults have changed, note this
1293   // modification.
1294   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1295     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1296   }
1297   if (PrintGCDetails && Verbose) {
1298     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1299       MarkStackSize / K, MarkStackSizeMax / K);
1300     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1301   }
1302 }
1303 #endif // KERNEL
1304 
1305 void set_object_alignment() {
1306   // Object alignment.
1307   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1308   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1309   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1310   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1311   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1312   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1313 
1314   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1315   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1316 
1317   // Oop encoding heap max
1318   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1319 
1320 #ifndef KERNEL
1321   // Set CMS global values
1322   CompactibleFreeListSpace::set_cms_values();
1323 #endif // KERNEL
1324 }
1325 
1326 bool verify_object_alignment() {
1327   // Object alignment.
1328   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1329     jio_fprintf(defaultStream::error_stream(),
1330                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1331                 (int)ObjectAlignmentInBytes);
1332     return false;
1333   }
1334   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1335     jio_fprintf(defaultStream::error_stream(),
1336                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1337                 (int)ObjectAlignmentInBytes, BytesPerLong);
1338     return false;
1339   }
1340   // It does not make sense to have big object alignment
1341   // since a space lost due to alignment will be greater
1342   // then a saved space from compressed oops.
1343   if ((int)ObjectAlignmentInBytes > 256) {
1344     jio_fprintf(defaultStream::error_stream(),
1345                 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1346                 (int)ObjectAlignmentInBytes);
1347     return false;
1348   }
1349   // In case page size is very small.
1350   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1351     jio_fprintf(defaultStream::error_stream(),
1352                 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1353                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1354     return false;
1355   }
1356   return true;
1357 }
1358 
1359 inline uintx max_heap_for_compressed_oops() {
1360   // Avoid sign flip.
1361   if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1362     return 0;
1363   }
1364   LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1365   NOT_LP64(ShouldNotReachHere(); return 0);
1366 }
1367 
1368 bool Arguments::should_auto_select_low_pause_collector() {
1369   if (UseAutoGCSelectPolicy &&
1370       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1371       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1372     if (PrintGCDetails) {
1373       // Cannot use gclog_or_tty yet.
1374       tty->print_cr("Automatic selection of the low pause collector"
1375        " based on pause goal of %d (ms)", MaxGCPauseMillis);
1376     }
1377     return true;
1378   }
1379   return false;
1380 }
1381 
1382 void Arguments::set_ergonomics_flags() {
1383   // Parallel GC is not compatible with sharing. If one specifies
1384   // that they want sharing explicitly, do not set ergonomics flags.
1385   if (DumpSharedSpaces || ForceSharedSpaces) {
1386     return;
1387   }
1388 
1389   if (os::is_server_class_machine() && !force_client_mode ) {
1390     // If no other collector is requested explicitly,
1391     // let the VM select the collector based on
1392     // machine class and automatic selection policy.
1393     if (!UseSerialGC &&
1394         !UseConcMarkSweepGC &&
1395         !UseG1GC &&
1396         !UseParNewGC &&
1397         !DumpSharedSpaces &&
1398         FLAG_IS_DEFAULT(UseParallelGC)) {
1399       if (should_auto_select_low_pause_collector()) {
1400         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1401       } else {
1402         FLAG_SET_ERGO(bool, UseParallelGC, true);
1403       }
1404       no_shared_spaces();
1405     }
1406   }
1407 
1408 #ifndef ZERO
1409 #ifdef _LP64
1410   // Check that UseCompressedOops can be set with the max heap size allocated
1411   // by ergonomics.
1412   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1413 #if !defined(COMPILER1) || defined(TIERED)
1414     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1415       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1416     }
1417 #endif
1418 #ifdef _WIN64
1419     if (UseLargePages && UseCompressedOops) {
1420       // Cannot allocate guard pages for implicit checks in indexed addressing
1421       // mode, when large pages are specified on windows.
1422       // This flag could be switched ON if narrow oop base address is set to 0,
1423       // see code in Universe::initialize_heap().
1424       Universe::set_narrow_oop_use_implicit_null_checks(false);
1425     }
1426 #endif //  _WIN64
1427   } else {
1428     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1429       warning("Max heap size too large for Compressed Oops");
1430       FLAG_SET_DEFAULT(UseCompressedOops, false);
1431     }
1432   }
1433   // Also checks that certain machines are slower with compressed oops
1434   // in vm_version initialization code.
1435 #endif // _LP64
1436 #endif // !ZERO
1437 }
1438 
1439 void Arguments::set_parallel_gc_flags() {
1440   assert(UseParallelGC || UseParallelOldGC, "Error");
1441   // If parallel old was requested, automatically enable parallel scavenge.
1442   if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1443     FLAG_SET_DEFAULT(UseParallelGC, true);
1444   }
1445 
1446   // If no heap maximum was requested explicitly, use some reasonable fraction
1447   // of the physical memory, up to a maximum of 1GB.
1448   if (UseParallelGC) {
1449     FLAG_SET_ERGO(uintx, ParallelGCThreads,
1450                   Abstract_VM_Version::parallel_worker_threads());
1451 
1452     // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1453     // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1454     // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1455     // See CR 6362902 for details.
1456     if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1457       if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1458          FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1459       }
1460       if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1461         FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1462       }
1463     }
1464 
1465     if (UseParallelOldGC) {
1466       // Par compact uses lower default values since they are treated as
1467       // minimums.  These are different defaults because of the different
1468       // interpretation and are not ergonomically set.
1469       if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1470         FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1471       }
1472       if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1473         FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1474       }
1475     }
1476   }
1477 }
1478 
1479 void Arguments::set_g1_gc_flags() {
1480   assert(UseG1GC, "Error");
1481 #ifdef COMPILER1
1482   FastTLABRefill = false;
1483 #endif
1484   FLAG_SET_DEFAULT(ParallelGCThreads,
1485                      Abstract_VM_Version::parallel_worker_threads());
1486   if (ParallelGCThreads == 0) {
1487     FLAG_SET_DEFAULT(ParallelGCThreads,
1488                      Abstract_VM_Version::parallel_worker_threads());
1489   }
1490   no_shared_spaces();
1491 
1492   if (FLAG_IS_DEFAULT(MarkStackSize)) {
1493     FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1494   }
1495   if (PrintGCDetails && Verbose) {
1496     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1497       MarkStackSize / K, MarkStackSizeMax / K);
1498     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1499   }
1500 
1501   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1502     // In G1, we want the default GC overhead goal to be higher than
1503     // say in PS. So we set it here to 10%. Otherwise the heap might
1504     // be expanded more aggressively than we would like it to. In
1505     // fact, even 10% seems to not be high enough in some cases
1506     // (especially small GC stress tests that the main thing they do
1507     // is allocation). We might consider increase it further.
1508     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1509   }
1510 }
1511 
1512 void Arguments::set_heap_size() {
1513   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1514     // Deprecated flag
1515     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1516   }
1517 
1518   const julong phys_mem =
1519     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1520                             : (julong)MaxRAM;
1521 
1522   // If the maximum heap size has not been set with -Xmx,
1523   // then set it as fraction of the size of physical memory,
1524   // respecting the maximum and minimum sizes of the heap.
1525   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1526     julong reasonable_max = phys_mem / MaxRAMFraction;
1527 
1528     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1529       // Small physical memory, so use a minimum fraction of it for the heap
1530       reasonable_max = phys_mem / MinRAMFraction;
1531     } else {
1532       // Not-small physical memory, so require a heap at least
1533       // as large as MaxHeapSize
1534       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1535     }
1536     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1537       // Limit the heap size to ErgoHeapSizeLimit
1538       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1539     }
1540     if (UseCompressedOops) {
1541       // Limit the heap size to the maximum possible when using compressed oops
1542       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1543       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1544         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1545         // but it should be not less than default MaxHeapSize.
1546         max_coop_heap -= HeapBaseMinAddress;
1547       }
1548       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1549     }
1550     reasonable_max = os::allocatable_physical_memory(reasonable_max);
1551 
1552     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1553       // An initial heap size was specified on the command line,
1554       // so be sure that the maximum size is consistent.  Done
1555       // after call to allocatable_physical_memory because that
1556       // method might reduce the allocation size.
1557       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1558     }
1559 
1560     if (PrintGCDetails && Verbose) {
1561       // Cannot use gclog_or_tty yet.
1562       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
1563     }
1564     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1565   }
1566 
1567   // If the initial_heap_size has not been set with InitialHeapSize
1568   // or -Xms, then set it as fraction of the size of physical memory,
1569   // respecting the maximum and minimum sizes of the heap.
1570   if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1571     julong reasonable_minimum = (julong)(OldSize + NewSize);
1572 
1573     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1574 
1575     reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1576 
1577     julong reasonable_initial = phys_mem / InitialRAMFraction;
1578 
1579     reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1580     reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1581 
1582     reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1583 
1584     if (PrintGCDetails && Verbose) {
1585       // Cannot use gclog_or_tty yet.
1586       tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1587       tty->print_cr("  Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1588     }
1589     FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1590     set_min_heap_size((uintx)reasonable_minimum);
1591   }
1592 }
1593 
1594 // This must be called after ergonomics because we want bytecode rewriting
1595 // if the server compiler is used, or if UseSharedSpaces is disabled.
1596 void Arguments::set_bytecode_flags() {
1597   // Better not attempt to store into a read-only space.
1598   if (UseSharedSpaces) {
1599     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1600     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1601   }
1602 
1603   if (!RewriteBytecodes) {
1604     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1605   }
1606 }
1607 
1608 // Aggressive optimization flags  -XX:+AggressiveOpts
1609 void Arguments::set_aggressive_opts_flags() {
1610 #ifdef COMPILER2
1611   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1612     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1613       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1614     }
1615     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1616       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1617     }
1618 
1619     // Feed the cache size setting into the JDK
1620     char buffer[1024];
1621     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1622     add_property(buffer);
1623   }
1624   if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1625     FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1626   }
1627   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1628     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1629   }
1630   if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1631     FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1632   }
1633   if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1634     FLAG_SET_DEFAULT(OptimizeFill, true);
1635   }
1636 #endif
1637 
1638   if (AggressiveOpts) {
1639 // Sample flag setting code
1640 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1641 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1642 //    }
1643   }
1644 }
1645 
1646 //===========================================================================================================
1647 // Parsing of java.compiler property
1648 
1649 void Arguments::process_java_compiler_argument(char* arg) {
1650   // For backwards compatibility, Djava.compiler=NONE or ""
1651   // causes us to switch to -Xint mode UNLESS -Xdebug
1652   // is also specified.
1653   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1654     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1655   }
1656 }
1657 
1658 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1659   _sun_java_launcher = strdup(launcher);
1660   if (strcmp("gamma", _sun_java_launcher) == 0) {
1661     _created_by_gamma_launcher = true;
1662     FLAG_SET_DEFAULT(PauseAtExit, true);
1663   }
1664 }
1665 
1666 bool Arguments::created_by_java_launcher() {
1667   assert(_sun_java_launcher != NULL, "property must have value");
1668   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1669 }
1670 
1671 bool Arguments::created_by_gamma_launcher() {
1672   return _created_by_gamma_launcher;
1673 }
1674 
1675 //===========================================================================================================
1676 // Parsing of main arguments
1677 
1678 bool Arguments::verify_interval(uintx val, uintx min,
1679                                 uintx max, const char* name) {
1680   // Returns true iff value is in the inclusive interval [min..max]
1681   // false, otherwise.
1682   if (val >= min && val <= max) {
1683     return true;
1684   }
1685   jio_fprintf(defaultStream::error_stream(),
1686               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1687               " and " UINTX_FORMAT "\n",
1688               name, val, min, max);
1689   return false;
1690 }
1691 
1692 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1693   // Returns true if given value is greater than specified min threshold
1694   // false, otherwise.
1695   if (val >= min ) {
1696       return true;
1697   }
1698   jio_fprintf(defaultStream::error_stream(),
1699               "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1700               name, val, min);
1701   return false;
1702 }
1703 
1704 bool Arguments::verify_percentage(uintx value, const char* name) {
1705   if (value <= 100) {
1706     return true;
1707   }
1708   jio_fprintf(defaultStream::error_stream(),
1709               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1710               name, value);
1711   return false;
1712 }
1713 
1714 static void force_serial_gc() {
1715   FLAG_SET_DEFAULT(UseSerialGC, true);
1716   FLAG_SET_DEFAULT(UseParNewGC, false);
1717   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1718   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
1719   FLAG_SET_DEFAULT(UseParallelGC, false);
1720   FLAG_SET_DEFAULT(UseParallelOldGC, false);
1721   FLAG_SET_DEFAULT(UseG1GC, false);
1722 }
1723 
1724 static bool verify_serial_gc_flags() {
1725   return (UseSerialGC &&
1726         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1727           UseParallelGC || UseParallelOldGC));
1728 }
1729 
1730 // Check consistency of GC selection
1731 bool Arguments::check_gc_consistency() {
1732   bool status = true;
1733   // Ensure that the user has not selected conflicting sets
1734   // of collectors. [Note: this check is merely a user convenience;
1735   // collectors over-ride each other so that only a non-conflicting
1736   // set is selected; however what the user gets is not what they
1737   // may have expected from the combination they asked for. It's
1738   // better to reduce user confusion by not allowing them to
1739   // select conflicting combinations.
1740   uint i = 0;
1741   if (UseSerialGC)                       i++;
1742   if (UseConcMarkSweepGC || UseParNewGC) i++;
1743   if (UseParallelGC || UseParallelOldGC) i++;
1744   if (UseG1GC)                           i++;
1745   if (i > 1) {
1746     jio_fprintf(defaultStream::error_stream(),
1747                 "Conflicting collector combinations in option list; "
1748                 "please refer to the release notes for the combinations "
1749                 "allowed\n");
1750     status = false;
1751   }
1752 
1753   return status;
1754 }
1755 
1756 // Check stack pages settings
1757 bool Arguments::check_stack_pages()
1758 {
1759   bool status = true;
1760   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1761   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1762   // greater stack shadow pages can't generate instruction to bang stack
1763   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1764   return status;
1765 }
1766 
1767 // Check the consistency of vm_init_args
1768 bool Arguments::check_vm_args_consistency() {
1769   // Method for adding checks for flag consistency.
1770   // The intent is to warn the user of all possible conflicts,
1771   // before returning an error.
1772   // Note: Needs platform-dependent factoring.
1773   bool status = true;
1774 
1775 #if ( (defined(COMPILER2) && defined(SPARC)))
1776   // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1777   // on sparc doesn't require generation of a stub as is the case on, e.g.,
1778   // x86.  Normally, VM_Version_init must be called from init_globals in
1779   // init.cpp, which is called by the initial java thread *after* arguments
1780   // have been parsed.  VM_Version_init gets called twice on sparc.
1781   extern void VM_Version_init();
1782   VM_Version_init();
1783   if (!VM_Version::has_v9()) {
1784     jio_fprintf(defaultStream::error_stream(),
1785                 "V8 Machine detected, Server requires V9\n");
1786     status = false;
1787   }
1788 #endif /* COMPILER2 && SPARC */
1789 
1790   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1791   // builds so the cost of stack banging can be measured.
1792 #if (defined(PRODUCT) && defined(SOLARIS))
1793   if (!UseBoundThreads && !UseStackBanging) {
1794     jio_fprintf(defaultStream::error_stream(),
1795                 "-UseStackBanging conflicts with -UseBoundThreads\n");
1796 
1797      status = false;
1798   }
1799 #endif
1800 
1801   if (TLABRefillWasteFraction == 0) {
1802     jio_fprintf(defaultStream::error_stream(),
1803                 "TLABRefillWasteFraction should be a denominator, "
1804                 "not " SIZE_FORMAT "\n",
1805                 TLABRefillWasteFraction);
1806     status = false;
1807   }
1808 
1809   status = status && verify_percentage(AdaptiveSizePolicyWeight,
1810                               "AdaptiveSizePolicyWeight");
1811   status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1812   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1813   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1814   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1815 
1816   if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1817     jio_fprintf(defaultStream::error_stream(),
1818                 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1819                 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1820                 MinHeapFreeRatio, MaxHeapFreeRatio);
1821     status = false;
1822   }
1823   // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1824   MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1825 
1826   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1827     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
1828   }
1829 
1830   if (UseParallelOldGC && ParallelOldGCSplitALot) {
1831     // Settings to encourage splitting.
1832     if (!FLAG_IS_CMDLINE(NewRatio)) {
1833       FLAG_SET_CMDLINE(intx, NewRatio, 2);
1834     }
1835     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1836       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1837     }
1838   }
1839 
1840   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1841   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1842   if (GCTimeLimit == 100) {
1843     // Turn off gc-overhead-limit-exceeded checks
1844     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1845   }
1846 
1847   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1848 
1849   // Check whether user-specified sharing option conflicts with GC or page size.
1850   // Both sharing and large pages are enabled by default on some platforms;
1851   // large pages override sharing only if explicitly set on the command line.
1852   const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1853           UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1854           UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1855   if (cannot_share) {
1856     // Either force sharing on by forcing the other options off, or
1857     // force sharing off.
1858     if (DumpSharedSpaces || ForceSharedSpaces) {
1859       jio_fprintf(defaultStream::error_stream(),
1860                   "Using Serial GC and default page size because of %s\n",
1861                   ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1862       force_serial_gc();
1863       FLAG_SET_DEFAULT(UseLargePages, false);
1864     } else {
1865       if (UseSharedSpaces && Verbose) {
1866         jio_fprintf(defaultStream::error_stream(),
1867                     "Turning off use of shared archive because of "
1868                     "choice of garbage collector or large pages\n");
1869       }
1870       no_shared_spaces();
1871     }
1872   } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1873     FLAG_SET_DEFAULT(UseLargePages, false);
1874   }
1875 
1876   status = status && check_gc_consistency();
1877   status = status && check_stack_pages();
1878 
1879   if (_has_alloc_profile) {
1880     if (UseParallelGC || UseParallelOldGC) {
1881       jio_fprintf(defaultStream::error_stream(),
1882                   "error:  invalid argument combination.\n"
1883                   "Allocation profiling (-Xaprof) cannot be used together with "
1884                   "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1885       status = false;
1886     }
1887     if (UseConcMarkSweepGC) {
1888       jio_fprintf(defaultStream::error_stream(),
1889                   "error:  invalid argument combination.\n"
1890                   "Allocation profiling (-Xaprof) cannot be used together with "
1891                   "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1892       status = false;
1893     }
1894   }
1895 
1896   if (CMSIncrementalMode) {
1897     if (!UseConcMarkSweepGC) {
1898       jio_fprintf(defaultStream::error_stream(),
1899                   "error:  invalid argument combination.\n"
1900                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1901                   "selected in order\nto use CMSIncrementalMode.\n");
1902       status = false;
1903     } else {
1904       status = status && verify_percentage(CMSIncrementalDutyCycle,
1905                                   "CMSIncrementalDutyCycle");
1906       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1907                                   "CMSIncrementalDutyCycleMin");
1908       status = status && verify_percentage(CMSIncrementalSafetyFactor,
1909                                   "CMSIncrementalSafetyFactor");
1910       status = status && verify_percentage(CMSIncrementalOffset,
1911                                   "CMSIncrementalOffset");
1912       status = status && verify_percentage(CMSExpAvgFactor,
1913                                   "CMSExpAvgFactor");
1914       // If it was not set on the command line, set
1915       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1916       if (CMSInitiatingOccupancyFraction < 0) {
1917         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1918       }
1919     }
1920   }
1921 
1922   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1923   // insists that we hold the requisite locks so that the iteration is
1924   // MT-safe. For the verification at start-up and shut-down, we don't
1925   // yet have a good way of acquiring and releasing these locks,
1926   // which are not visible at the CollectedHeap level. We want to
1927   // be able to acquire these locks and then do the iteration rather
1928   // than just disable the lock verification. This will be fixed under
1929   // bug 4788986.
1930   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1931     if (VerifyGCStartAt == 0) {
1932       warning("Heap verification at start-up disabled "
1933               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1934       VerifyGCStartAt = 1;      // Disable verification at start-up
1935     }
1936     if (VerifyBeforeExit) {
1937       warning("Heap verification at shutdown disabled "
1938               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1939       VerifyBeforeExit = false; // Disable verification at shutdown
1940     }
1941   }
1942 
1943   // Note: only executed in non-PRODUCT mode
1944   if (!UseAsyncConcMarkSweepGC &&
1945       (ExplicitGCInvokesConcurrent ||
1946        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1947     jio_fprintf(defaultStream::error_stream(),
1948                 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1949                 " with -UseAsyncConcMarkSweepGC");
1950     status = false;
1951   }
1952 
1953 #ifndef SERIALGC
1954   if (UseG1GC) {
1955     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1956                                          "InitiatingHeapOccupancyPercent");
1957     status = status && verify_min_value(G1RefProcDrainInterval, 1,
1958                                         "G1RefProcDrainInterval");
1959     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1960                                         "G1ConcMarkStepDurationMillis");
1961   }
1962 #endif
1963 
1964   status = status && verify_interval(RefDiscoveryPolicy,
1965                                      ReferenceProcessor::DiscoveryPolicyMin,
1966                                      ReferenceProcessor::DiscoveryPolicyMax,
1967                                      "RefDiscoveryPolicy");
1968 
1969   // Limit the lower bound of this flag to 1 as it is used in a division
1970   // expression.
1971   status = status && verify_interval(TLABWasteTargetPercent,
1972                                      1, 100, "TLABWasteTargetPercent");
1973 
1974   status = status && verify_object_alignment();
1975 
1976   return status;
1977 }
1978 
1979 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1980   const char* option_type) {
1981   if (ignore) return false;
1982 
1983   const char* spacer = " ";
1984   if (option_type == NULL) {
1985     option_type = ++spacer; // Set both to the empty string.
1986   }
1987 
1988   if (os::obsolete_option(option)) {
1989     jio_fprintf(defaultStream::error_stream(),
1990                 "Obsolete %s%soption: %s\n", option_type, spacer,
1991       option->optionString);
1992     return false;
1993   } else {
1994     jio_fprintf(defaultStream::error_stream(),
1995                 "Unrecognized %s%soption: %s\n", option_type, spacer,
1996       option->optionString);
1997     return true;
1998   }
1999 }
2000 
2001 static const char* user_assertion_options[] = {
2002   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2003 };
2004 
2005 static const char* system_assertion_options[] = {
2006   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2007 };
2008 
2009 // Return true if any of the strings in null-terminated array 'names' matches.
2010 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2011 // the option must match exactly.
2012 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2013   bool tail_allowed) {
2014   for (/* empty */; *names != NULL; ++names) {
2015     if (match_option(option, *names, tail)) {
2016       if (**tail == '\0' || tail_allowed && **tail == ':') {
2017         return true;
2018       }
2019     }
2020   }
2021   return false;
2022 }
2023 
2024 bool Arguments::parse_uintx(const char* value,
2025                             uintx* uintx_arg,
2026                             uintx min_size) {
2027 
2028   // Check the sign first since atomull() parses only unsigned values.
2029   bool value_is_positive = !(*value == '-');
2030 
2031   if (value_is_positive) {
2032     julong n;
2033     bool good_return = atomull(value, &n);
2034     if (good_return) {
2035       bool above_minimum = n >= min_size;
2036       bool value_is_too_large = n > max_uintx;
2037 
2038       if (above_minimum && !value_is_too_large) {
2039         *uintx_arg = n;
2040         return true;
2041       }
2042     }
2043   }
2044   return false;
2045 }
2046 
2047 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2048                                                   julong* long_arg,
2049                                                   julong min_size) {
2050   if (!atomull(s, long_arg)) return arg_unreadable;
2051   return check_memory_size(*long_arg, min_size);
2052 }
2053 
2054 // Parse JavaVMInitArgs structure
2055 
2056 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2057   // For components of the system classpath.
2058   SysClassPath scp(Arguments::get_sysclasspath());
2059   bool scp_assembly_required = false;
2060 
2061   // Save default settings for some mode flags
2062   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2063   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2064   Arguments::_ClipInlining             = ClipInlining;
2065   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2066 
2067   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2068   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2069   if (result != JNI_OK) {
2070     return result;
2071   }
2072 
2073   // Parse JavaVMInitArgs structure passed in
2074   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2075   if (result != JNI_OK) {
2076     return result;
2077   }
2078 
2079   if (AggressiveOpts) {
2080     // Insert alt-rt.jar between user-specified bootclasspath
2081     // prefix and the default bootclasspath.  os::set_boot_path()
2082     // uses meta_index_dir as the default bootclasspath directory.
2083     const char* altclasses_jar = "alt-rt.jar";
2084     size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2085                                  strlen(altclasses_jar);
2086     char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2087     strcpy(altclasses_path, get_meta_index_dir());
2088     strcat(altclasses_path, altclasses_jar);
2089     scp.add_suffix_to_prefix(altclasses_path);
2090     scp_assembly_required = true;
2091     FREE_C_HEAP_ARRAY(char, altclasses_path);
2092   }
2093 
2094   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2095   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2096   if (result != JNI_OK) {
2097     return result;
2098   }
2099 
2100   // Do final processing now that all arguments have been parsed
2101   result = finalize_vm_init_args(&scp, scp_assembly_required);
2102   if (result != JNI_OK) {
2103     return result;
2104   }
2105 
2106   return JNI_OK;
2107 }
2108 
2109 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2110                                        SysClassPath* scp_p,
2111                                        bool* scp_assembly_required_p,
2112                                        FlagValueOrigin origin) {
2113   // Remaining part of option string
2114   const char* tail;
2115 
2116   // iterate over arguments
2117   for (int index = 0; index < args->nOptions; index++) {
2118     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2119 
2120     const JavaVMOption* option = args->options + index;
2121 
2122     if (!match_option(option, "-Djava.class.path", &tail) &&
2123         !match_option(option, "-Dsun.java.command", &tail) &&
2124         !match_option(option, "-Dsun.java.launcher", &tail)) {
2125 
2126         // add all jvm options to the jvm_args string. This string
2127         // is used later to set the java.vm.args PerfData string constant.
2128         // the -Djava.class.path and the -Dsun.java.command options are
2129         // omitted from jvm_args string as each have their own PerfData
2130         // string constant object.
2131         build_jvm_args(option->optionString);
2132     }
2133 
2134     // -verbose:[class/gc/jni]
2135     if (match_option(option, "-verbose", &tail)) {
2136       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2137         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2138         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2139       } else if (!strcmp(tail, ":gc")) {
2140         FLAG_SET_CMDLINE(bool, PrintGC, true);
2141       } else if (!strcmp(tail, ":jni")) {
2142         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2143       }
2144     // -da / -ea / -disableassertions / -enableassertions
2145     // These accept an optional class/package name separated by a colon, e.g.,
2146     // -da:java.lang.Thread.
2147     } else if (match_option(option, user_assertion_options, &tail, true)) {
2148       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2149       if (*tail == '\0') {
2150         JavaAssertions::setUserClassDefault(enable);
2151       } else {
2152         assert(*tail == ':', "bogus match by match_option()");
2153         JavaAssertions::addOption(tail + 1, enable);
2154       }
2155     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2156     } else if (match_option(option, system_assertion_options, &tail, false)) {
2157       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2158       JavaAssertions::setSystemClassDefault(enable);
2159     // -bootclasspath:
2160     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2161       scp_p->reset_path(tail);
2162       *scp_assembly_required_p = true;
2163     // -bootclasspath/a:
2164     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2165       scp_p->add_suffix(tail);
2166       *scp_assembly_required_p = true;
2167     // -bootclasspath/p:
2168     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2169       scp_p->add_prefix(tail);
2170       *scp_assembly_required_p = true;
2171     // -Xrun
2172     } else if (match_option(option, "-Xrun", &tail)) {
2173       if (tail != NULL) {
2174         const char* pos = strchr(tail, ':');
2175         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2176         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2177         name[len] = '\0';
2178 
2179         char *options = NULL;
2180         if(pos != NULL) {
2181           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2182           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2183         }
2184 #ifdef JVMTI_KERNEL
2185         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2186           warning("profiling and debugging agents are not supported with Kernel VM");
2187         } else
2188 #endif // JVMTI_KERNEL
2189         add_init_library(name, options);
2190       }
2191     // -agentlib and -agentpath
2192     } else if (match_option(option, "-agentlib:", &tail) ||
2193           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2194       if(tail != NULL) {
2195         const char* pos = strchr(tail, '=');
2196         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2197         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2198         name[len] = '\0';
2199 
2200         char *options = NULL;
2201         if(pos != NULL) {
2202           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2203         }
2204 #ifdef JVMTI_KERNEL
2205         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2206           warning("profiling and debugging agents are not supported with Kernel VM");
2207         } else
2208 #endif // JVMTI_KERNEL
2209         add_init_agent(name, options, is_absolute_path);
2210 
2211       }
2212     // -javaagent
2213     } else if (match_option(option, "-javaagent:", &tail)) {
2214       if(tail != NULL) {
2215         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2216         add_init_agent("instrument", options, false);
2217       }
2218     // -Xnoclassgc
2219     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2220       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2221     // -Xincgc: i-CMS
2222     } else if (match_option(option, "-Xincgc", &tail)) {
2223       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2224       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2225     // -Xnoincgc: no i-CMS
2226     } else if (match_option(option, "-Xnoincgc", &tail)) {
2227       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2228       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2229     // -Xconcgc
2230     } else if (match_option(option, "-Xconcgc", &tail)) {
2231       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2232     // -Xnoconcgc
2233     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2234       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2235     // -Xbatch
2236     } else if (match_option(option, "-Xbatch", &tail)) {
2237       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2238     // -Xmn for compatibility with other JVM vendors
2239     } else if (match_option(option, "-Xmn", &tail)) {
2240       julong long_initial_eden_size = 0;
2241       ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2242       if (errcode != arg_in_range) {
2243         jio_fprintf(defaultStream::error_stream(),
2244                     "Invalid initial eden size: %s\n", option->optionString);
2245         describe_range_error(errcode);
2246         return JNI_EINVAL;
2247       }
2248       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2249       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2250     // -Xms
2251     } else if (match_option(option, "-Xms", &tail)) {
2252       julong long_initial_heap_size = 0;
2253       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2254       if (errcode != arg_in_range) {
2255         jio_fprintf(defaultStream::error_stream(),
2256                     "Invalid initial heap size: %s\n", option->optionString);
2257         describe_range_error(errcode);
2258         return JNI_EINVAL;
2259       }
2260       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2261       // Currently the minimum size and the initial heap sizes are the same.
2262       set_min_heap_size(InitialHeapSize);
2263     // -Xmx
2264     } else if (match_option(option, "-Xmx", &tail)) {
2265       julong long_max_heap_size = 0;
2266       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2267       if (errcode != arg_in_range) {
2268         jio_fprintf(defaultStream::error_stream(),
2269                     "Invalid maximum heap size: %s\n", option->optionString);
2270         describe_range_error(errcode);
2271         return JNI_EINVAL;
2272       }
2273       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2274     // Xmaxf
2275     } else if (match_option(option, "-Xmaxf", &tail)) {
2276       int maxf = (int)(atof(tail) * 100);
2277       if (maxf < 0 || maxf > 100) {
2278         jio_fprintf(defaultStream::error_stream(),
2279                     "Bad max heap free percentage size: %s\n",
2280                     option->optionString);
2281         return JNI_EINVAL;
2282       } else {
2283         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2284       }
2285     // Xminf
2286     } else if (match_option(option, "-Xminf", &tail)) {
2287       int minf = (int)(atof(tail) * 100);
2288       if (minf < 0 || minf > 100) {
2289         jio_fprintf(defaultStream::error_stream(),
2290                     "Bad min heap free percentage size: %s\n",
2291                     option->optionString);
2292         return JNI_EINVAL;
2293       } else {
2294         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2295       }
2296     // -Xss
2297     } else if (match_option(option, "-Xss", &tail)) {
2298       julong long_ThreadStackSize = 0;
2299       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2300       if (errcode != arg_in_range) {
2301         jio_fprintf(defaultStream::error_stream(),
2302                     "Invalid thread stack size: %s\n", option->optionString);
2303         describe_range_error(errcode);
2304         return JNI_EINVAL;
2305       }
2306       // Internally track ThreadStackSize in units of 1024 bytes.
2307       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2308                               round_to((int)long_ThreadStackSize, K) / K);
2309     // -Xoss
2310     } else if (match_option(option, "-Xoss", &tail)) {
2311           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2312     // -Xmaxjitcodesize
2313     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2314                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2315       julong long_ReservedCodeCacheSize = 0;
2316       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2317                                             (size_t)InitialCodeCacheSize);
2318       if (errcode != arg_in_range) {
2319         jio_fprintf(defaultStream::error_stream(),
2320                     "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2321                     option->optionString, InitialCodeCacheSize/K);
2322         describe_range_error(errcode);
2323         return JNI_EINVAL;
2324       }
2325       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2326     // -green
2327     } else if (match_option(option, "-green", &tail)) {
2328       jio_fprintf(defaultStream::error_stream(),
2329                   "Green threads support not available\n");
2330           return JNI_EINVAL;
2331     // -native
2332     } else if (match_option(option, "-native", &tail)) {
2333           // HotSpot always uses native threads, ignore silently for compatibility
2334     // -Xsqnopause
2335     } else if (match_option(option, "-Xsqnopause", &tail)) {
2336           // EVM option, ignore silently for compatibility
2337     // -Xrs
2338     } else if (match_option(option, "-Xrs", &tail)) {
2339           // Classic/EVM option, new functionality
2340       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2341     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2342           // change default internal VM signals used - lower case for back compat
2343       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2344     // -Xoptimize
2345     } else if (match_option(option, "-Xoptimize", &tail)) {
2346           // EVM option, ignore silently for compatibility
2347     // -Xprof
2348     } else if (match_option(option, "-Xprof", &tail)) {
2349 #ifndef FPROF_KERNEL
2350       _has_profile = true;
2351 #else // FPROF_KERNEL
2352       // do we have to exit?
2353       warning("Kernel VM does not support flat profiling.");
2354 #endif // FPROF_KERNEL
2355     // -Xaprof
2356     } else if (match_option(option, "-Xaprof", &tail)) {
2357       _has_alloc_profile = true;
2358     // -Xconcurrentio
2359     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2360       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2361       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2362       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2363       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2364       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2365 
2366       // -Xinternalversion
2367     } else if (match_option(option, "-Xinternalversion", &tail)) {
2368       jio_fprintf(defaultStream::output_stream(), "%s\n",
2369                   VM_Version::internal_vm_info_string());
2370       vm_exit(0);
2371 #ifndef PRODUCT
2372     // -Xprintflags
2373     } else if (match_option(option, "-Xprintflags", &tail)) {
2374       CommandLineFlags::printFlags();
2375       vm_exit(0);
2376 #endif
2377     // -D
2378     } else if (match_option(option, "-D", &tail)) {
2379       if (!add_property(tail)) {
2380         return JNI_ENOMEM;
2381       }
2382       // Out of the box management support
2383       if (match_option(option, "-Dcom.sun.management", &tail)) {
2384         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2385       }
2386     // -Xint
2387     } else if (match_option(option, "-Xint", &tail)) {
2388           set_mode_flags(_int);
2389     // -Xmixed
2390     } else if (match_option(option, "-Xmixed", &tail)) {
2391           set_mode_flags(_mixed);
2392     // -Xcomp
2393     } else if (match_option(option, "-Xcomp", &tail)) {
2394       // for testing the compiler; turn off all flags that inhibit compilation
2395           set_mode_flags(_comp);
2396 
2397     // -Xshare:dump
2398     } else if (match_option(option, "-Xshare:dump", &tail)) {
2399 #ifdef TIERED
2400       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2401       set_mode_flags(_int);     // Prevent compilation, which creates objects
2402 #elif defined(COMPILER2)
2403       vm_exit_during_initialization(
2404           "Dumping a shared archive is not supported on the Server JVM.", NULL);
2405 #elif defined(KERNEL)
2406       vm_exit_during_initialization(
2407           "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2408 #else
2409       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2410       set_mode_flags(_int);     // Prevent compilation, which creates objects
2411 #endif
2412     // -Xshare:on
2413     } else if (match_option(option, "-Xshare:on", &tail)) {
2414       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2415       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2416 #ifdef TIERED
2417       FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2418 #endif // TIERED
2419     // -Xshare:auto
2420     } else if (match_option(option, "-Xshare:auto", &tail)) {
2421       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2422       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2423     // -Xshare:off
2424     } else if (match_option(option, "-Xshare:off", &tail)) {
2425       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2426       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2427 
2428     // -Xverify
2429     } else if (match_option(option, "-Xverify", &tail)) {
2430       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2431         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2432         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2433       } else if (strcmp(tail, ":remote") == 0) {
2434         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2435         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2436       } else if (strcmp(tail, ":none") == 0) {
2437         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2438         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2439       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2440         return JNI_EINVAL;
2441       }
2442     // -Xdebug
2443     } else if (match_option(option, "-Xdebug", &tail)) {
2444       // note this flag has been used, then ignore
2445       set_xdebug_mode(true);
2446     // -Xnoagent
2447     } else if (match_option(option, "-Xnoagent", &tail)) {
2448       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2449     } else if (match_option(option, "-Xboundthreads", &tail)) {
2450       // Bind user level threads to kernel threads (Solaris only)
2451       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2452     } else if (match_option(option, "-Xloggc:", &tail)) {
2453       // Redirect GC output to the file. -Xloggc:<filename>
2454       // ostream_init_log(), when called will use this filename
2455       // to initialize a fileStream.
2456       _gc_log_filename = strdup(tail);
2457       FLAG_SET_CMDLINE(bool, PrintGC, true);
2458       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2459       FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2460 
2461     // JNI hooks
2462     } else if (match_option(option, "-Xcheck", &tail)) {
2463       if (!strcmp(tail, ":jni")) {
2464         CheckJNICalls = true;
2465       } else if (is_bad_option(option, args->ignoreUnrecognized,
2466                                      "check")) {
2467         return JNI_EINVAL;
2468       }
2469     } else if (match_option(option, "vfprintf", &tail)) {
2470       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2471     } else if (match_option(option, "exit", &tail)) {
2472       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2473     } else if (match_option(option, "abort", &tail)) {
2474       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2475     // -XX:+AggressiveHeap
2476     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2477 
2478       // This option inspects the machine and attempts to set various
2479       // parameters to be optimal for long-running, memory allocation
2480       // intensive jobs.  It is intended for machines with large
2481       // amounts of cpu and memory.
2482 
2483       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2484       // VM, but we may not be able to represent the total physical memory
2485       // available (like having 8gb of memory on a box but using a 32bit VM).
2486       // Thus, we need to make sure we're using a julong for intermediate
2487       // calculations.
2488       julong initHeapSize;
2489       julong total_memory = os::physical_memory();
2490 
2491       if (total_memory < (julong)256*M) {
2492         jio_fprintf(defaultStream::error_stream(),
2493                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2494         vm_exit(1);
2495       }
2496 
2497       // The heap size is half of available memory, or (at most)
2498       // all of possible memory less 160mb (leaving room for the OS
2499       // when using ISM).  This is the maximum; because adaptive sizing
2500       // is turned on below, the actual space used may be smaller.
2501 
2502       initHeapSize = MIN2(total_memory / (julong)2,
2503                           total_memory - (julong)160*M);
2504 
2505       // Make sure that if we have a lot of memory we cap the 32 bit
2506       // process space.  The 64bit VM version of this function is a nop.
2507       initHeapSize = os::allocatable_physical_memory(initHeapSize);
2508 
2509       // The perm gen is separate but contiguous with the
2510       // object heap (and is reserved with it) so subtract it
2511       // from the heap size.
2512       if (initHeapSize > MaxPermSize) {
2513         initHeapSize = initHeapSize - MaxPermSize;
2514       } else {
2515         warning("AggressiveHeap and MaxPermSize values may conflict");
2516       }
2517 
2518       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2519          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2520          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2521          // Currently the minimum size and the initial heap sizes are the same.
2522          set_min_heap_size(initHeapSize);
2523       }
2524       if (FLAG_IS_DEFAULT(NewSize)) {
2525          // Make the young generation 3/8ths of the total heap.
2526          FLAG_SET_CMDLINE(uintx, NewSize,
2527                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2528          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2529       }
2530 
2531       FLAG_SET_DEFAULT(UseLargePages, true);
2532 
2533       // Increase some data structure sizes for efficiency
2534       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2535       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2536       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2537 
2538       // See the OldPLABSize comment below, but replace 'after promotion'
2539       // with 'after copying'.  YoungPLABSize is the size of the survivor
2540       // space per-gc-thread buffers.  The default is 4kw.
2541       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
2542 
2543       // OldPLABSize is the size of the buffers in the old gen that
2544       // UseParallelGC uses to promote live data that doesn't fit in the
2545       // survivor spaces.  At any given time, there's one for each gc thread.
2546       // The default size is 1kw. These buffers are rarely used, since the
2547       // survivor spaces are usually big enough.  For specjbb, however, there
2548       // are occasions when there's lots of live data in the young gen
2549       // and we end up promoting some of it.  We don't have a definite
2550       // explanation for why bumping OldPLABSize helps, but the theory
2551       // is that a bigger PLAB results in retaining something like the
2552       // original allocation order after promotion, which improves mutator
2553       // locality.  A minor effect may be that larger PLABs reduce the
2554       // number of PLAB allocation events during gc.  The value of 8kw
2555       // was arrived at by experimenting with specjbb.
2556       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
2557 
2558       // CompilationPolicyChoice=0 causes the server compiler to adopt
2559       // a more conservative which-method-do-I-compile policy when one
2560       // of the counters maintained by the interpreter trips.  The
2561       // result is reduced startup time and improved specjbb and
2562       // alacrity performance.  Zero is the default, but we set it
2563       // explicitly here in case the default changes.
2564       // See runtime/compilationPolicy.*.
2565       FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2566 
2567       // Enable parallel GC and adaptive generation sizing
2568       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2569       FLAG_SET_DEFAULT(ParallelGCThreads,
2570                        Abstract_VM_Version::parallel_worker_threads());
2571 
2572       // Encourage steady state memory management
2573       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2574 
2575       // This appears to improve mutator locality
2576       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2577 
2578       // Get around early Solaris scheduling bug
2579       // (affinity vs other jobs on system)
2580       // but disallow DR and offlining (5008695).
2581       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2582 
2583     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2584       // The last option must always win.
2585       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2586       FLAG_SET_CMDLINE(bool, NeverTenure, true);
2587     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2588       // The last option must always win.
2589       FLAG_SET_CMDLINE(bool, NeverTenure, false);
2590       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2591     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2592                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2593       jio_fprintf(defaultStream::error_stream(),
2594         "Please use CMSClassUnloadingEnabled in place of "
2595         "CMSPermGenSweepingEnabled in the future\n");
2596     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2597       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2598       jio_fprintf(defaultStream::error_stream(),
2599         "Please use -XX:+UseGCOverheadLimit in place of "
2600         "-XX:+UseGCTimeLimit in the future\n");
2601     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2602       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2603       jio_fprintf(defaultStream::error_stream(),
2604         "Please use -XX:-UseGCOverheadLimit in place of "
2605         "-XX:-UseGCTimeLimit in the future\n");
2606     // The TLE options are for compatibility with 1.3 and will be
2607     // removed without notice in a future release.  These options
2608     // are not to be documented.
2609     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2610       // No longer used.
2611     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2612       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2613     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2614       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2615     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2616       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2617     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2618       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2619     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2620       // No longer used.
2621     } else if (match_option(option, "-XX:TLESize=", &tail)) {
2622       julong long_tlab_size = 0;
2623       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2624       if (errcode != arg_in_range) {
2625         jio_fprintf(defaultStream::error_stream(),
2626                     "Invalid TLAB size: %s\n", option->optionString);
2627         describe_range_error(errcode);
2628         return JNI_EINVAL;
2629       }
2630       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2631     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2632       // No longer used.
2633     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2634       FLAG_SET_CMDLINE(bool, UseTLAB, true);
2635     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2636       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2637 SOLARIS_ONLY(
2638     } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2639       warning("-XX:+UsePermISM is obsolete.");
2640       FLAG_SET_CMDLINE(bool, UseISM, true);
2641     } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2642       FLAG_SET_CMDLINE(bool, UseISM, false);
2643 )
2644     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2645       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2646       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2647     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2648       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2649       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2650     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2651 #ifdef SOLARIS
2652       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2653       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2654       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2655       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2656 #else // ndef SOLARIS
2657       jio_fprintf(defaultStream::error_stream(),
2658                   "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2659       return JNI_EINVAL;
2660 #endif // ndef SOLARIS
2661 #ifdef ASSERT
2662     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2663       FLAG_SET_CMDLINE(bool, FullGCALot, true);
2664       // disable scavenge before parallel mark-compact
2665       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2666 #endif
2667     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2668       julong cms_blocks_to_claim = (julong)atol(tail);
2669       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2670       jio_fprintf(defaultStream::error_stream(),
2671         "Please use -XX:OldPLABSize in place of "
2672         "-XX:CMSParPromoteBlocksToClaim in the future\n");
2673     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2674       julong cms_blocks_to_claim = (julong)atol(tail);
2675       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2676       jio_fprintf(defaultStream::error_stream(),
2677         "Please use -XX:OldPLABSize in place of "
2678         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2679     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2680       julong old_plab_size = 0;
2681       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2682       if (errcode != arg_in_range) {
2683         jio_fprintf(defaultStream::error_stream(),
2684                     "Invalid old PLAB size: %s\n", option->optionString);
2685         describe_range_error(errcode);
2686         return JNI_EINVAL;
2687       }
2688       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2689       jio_fprintf(defaultStream::error_stream(),
2690                   "Please use -XX:OldPLABSize in place of "
2691                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2692     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2693       julong young_plab_size = 0;
2694       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2695       if (errcode != arg_in_range) {
2696         jio_fprintf(defaultStream::error_stream(),
2697                     "Invalid young PLAB size: %s\n", option->optionString);
2698         describe_range_error(errcode);
2699         return JNI_EINVAL;
2700       }
2701       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2702       jio_fprintf(defaultStream::error_stream(),
2703                   "Please use -XX:YoungPLABSize in place of "
2704                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2705     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2706                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2707       julong stack_size = 0;
2708       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2709       if (errcode != arg_in_range) {
2710         jio_fprintf(defaultStream::error_stream(),
2711                     "Invalid mark stack size: %s\n", option->optionString);
2712         describe_range_error(errcode);
2713         return JNI_EINVAL;
2714       }
2715       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2716     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2717       julong max_stack_size = 0;
2718       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2719       if (errcode != arg_in_range) {
2720         jio_fprintf(defaultStream::error_stream(),
2721                     "Invalid maximum mark stack size: %s\n",
2722                     option->optionString);
2723         describe_range_error(errcode);
2724         return JNI_EINVAL;
2725       }
2726       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2727     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2728                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2729       uintx conc_threads = 0;
2730       if (!parse_uintx(tail, &conc_threads, 1)) {
2731         jio_fprintf(defaultStream::error_stream(),
2732                     "Invalid concurrent threads: %s\n", option->optionString);
2733         return JNI_EINVAL;
2734       }
2735       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2736     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2737       // Skip -XX:Flags= since that case has already been handled
2738       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2739         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2740           return JNI_EINVAL;
2741         }
2742       }
2743     // Unknown option
2744     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2745       return JNI_ERR;
2746     }
2747   }
2748   // Change the default value for flags  which have different default values
2749   // when working with older JDKs.
2750   if (JDK_Version::current().compare_major(6) <= 0 &&
2751       FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2752     FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2753   }
2754 #ifdef LINUX
2755  if (JDK_Version::current().compare_major(6) <= 0 &&
2756       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2757     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2758   }
2759 #endif // LINUX
2760   return JNI_OK;
2761 }
2762 
2763 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2764   // This must be done after all -D arguments have been processed.
2765   scp_p->expand_endorsed();
2766 
2767   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2768     // Assemble the bootclasspath elements into the final path.
2769     Arguments::set_sysclasspath(scp_p->combined_path());
2770   }
2771 
2772   // This must be done after all arguments have been processed.
2773   // java_compiler() true means set to "NONE" or empty.
2774   if (java_compiler() && !xdebug_mode()) {
2775     // For backwards compatibility, we switch to interpreted mode if
2776     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2777     // not specified.
2778     set_mode_flags(_int);
2779   }
2780   if (CompileThreshold == 0) {
2781     set_mode_flags(_int);
2782   }
2783 
2784 #ifndef COMPILER2
2785   // Don't degrade server performance for footprint
2786   if (FLAG_IS_DEFAULT(UseLargePages) &&
2787       MaxHeapSize < LargePageHeapSizeThreshold) {
2788     // No need for large granularity pages w/small heaps.
2789     // Note that large pages are enabled/disabled for both the
2790     // Java heap and the code cache.
2791     FLAG_SET_DEFAULT(UseLargePages, false);
2792     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2793     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2794   }
2795 
2796   // Tiered compilation is undefined with C1.
2797   TieredCompilation = false;
2798 #else
2799   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2800     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2801   }
2802   // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2803   if (UseG1GC) {
2804     FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2805   }
2806 #endif
2807 
2808   // If we are running in a headless jre, force java.awt.headless property
2809   // to be true unless the property has already been set.
2810   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2811   if (os::is_headless_jre()) {
2812     const char* headless = Arguments::get_property("java.awt.headless");
2813     if (headless == NULL) {
2814       char envbuffer[128];
2815       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2816         if (!add_property("java.awt.headless=true")) {
2817           return JNI_ENOMEM;
2818         }
2819       } else {
2820         char buffer[256];
2821         strcpy(buffer, "java.awt.headless=");
2822         strcat(buffer, envbuffer);
2823         if (!add_property(buffer)) {
2824           return JNI_ENOMEM;
2825         }
2826       }
2827     }
2828   }
2829 
2830   if (!check_vm_args_consistency()) {
2831     return JNI_ERR;
2832   }
2833 
2834   return JNI_OK;
2835 }
2836 
2837 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2838   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2839                                             scp_assembly_required_p);
2840 }
2841 
2842 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2843   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2844                                             scp_assembly_required_p);
2845 }
2846 
2847 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2848   const int N_MAX_OPTIONS = 64;
2849   const int OPTION_BUFFER_SIZE = 1024;
2850   char buffer[OPTION_BUFFER_SIZE];
2851 
2852   // The variable will be ignored if it exceeds the length of the buffer.
2853   // Don't check this variable if user has special privileges
2854   // (e.g. unix su command).
2855   if (os::getenv(name, buffer, sizeof(buffer)) &&
2856       !os::have_special_privileges()) {
2857     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
2858     jio_fprintf(defaultStream::error_stream(),
2859                 "Picked up %s: %s\n", name, buffer);
2860     char* rd = buffer;                        // pointer to the input string (rd)
2861     int i;
2862     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
2863       while (isspace(*rd)) rd++;              // skip whitespace
2864       if (*rd == 0) break;                    // we re done when the input string is read completely
2865 
2866       // The output, option string, overwrites the input string.
2867       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2868       // input string (rd).
2869       char* wrt = rd;
2870 
2871       options[i++].optionString = wrt;        // Fill in option
2872       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
2873         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
2874           int quote = *rd;                    // matching quote to look for
2875           rd++;                               // don't copy open quote
2876           while (*rd != quote) {              // include everything (even spaces) up until quote
2877             if (*rd == 0) {                   // string termination means unmatched string
2878               jio_fprintf(defaultStream::error_stream(),
2879                           "Unmatched quote in %s\n", name);
2880               return JNI_ERR;
2881             }
2882             *wrt++ = *rd++;                   // copy to option string
2883           }
2884           rd++;                               // don't copy close quote
2885         } else {
2886           *wrt++ = *rd++;                     // copy to option string
2887         }
2888       }
2889       // Need to check if we're done before writing a NULL,
2890       // because the write could be to the byte that rd is pointing to.
2891       if (*rd++ == 0) {
2892         *wrt = 0;
2893         break;
2894       }
2895       *wrt = 0;                               // Zero terminate option
2896     }
2897     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2898     JavaVMInitArgs vm_args;
2899     vm_args.version = JNI_VERSION_1_2;
2900     vm_args.options = options;
2901     vm_args.nOptions = i;
2902     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2903 
2904     if (PrintVMOptions) {
2905       const char* tail;
2906       for (int i = 0; i < vm_args.nOptions; i++) {
2907         const JavaVMOption *option = vm_args.options + i;
2908         if (match_option(option, "-XX:", &tail)) {
2909           logOption(tail);
2910         }
2911       }
2912     }
2913 
2914     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2915   }
2916   return JNI_OK;
2917 }
2918 
2919 
2920 // Parse entry point called from JNI_CreateJavaVM
2921 
2922 jint Arguments::parse(const JavaVMInitArgs* args) {
2923 
2924   // Sharing support
2925   // Construct the path to the archive
2926   char jvm_path[JVM_MAXPATHLEN];
2927   os::jvm_path(jvm_path, sizeof(jvm_path));
2928 #ifdef TIERED
2929   if (strstr(jvm_path, "client") != NULL) {
2930     force_client_mode = true;
2931   }
2932 #endif // TIERED
2933   char *end = strrchr(jvm_path, *os::file_separator());
2934   if (end != NULL) *end = '\0';
2935   char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2936                                         strlen(os::file_separator()) + 20);
2937   if (shared_archive_path == NULL) return JNI_ENOMEM;
2938   strcpy(shared_archive_path, jvm_path);
2939   strcat(shared_archive_path, os::file_separator());
2940   strcat(shared_archive_path, "classes");
2941   DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2942   strcat(shared_archive_path, ".jsa");
2943   SharedArchivePath = shared_archive_path;
2944 
2945   // Remaining part of option string
2946   const char* tail;
2947 
2948   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2949   bool settings_file_specified = false;
2950   const char* flags_file;
2951   int index;
2952   for (index = 0; index < args->nOptions; index++) {
2953     const JavaVMOption *option = args->options + index;
2954     if (match_option(option, "-XX:Flags=", &tail)) {
2955       flags_file = tail;
2956       settings_file_specified = true;
2957     }
2958     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2959       PrintVMOptions = true;
2960     }
2961     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2962       PrintVMOptions = false;
2963     }
2964     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2965       IgnoreUnrecognizedVMOptions = true;
2966     }
2967     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2968       IgnoreUnrecognizedVMOptions = false;
2969     }
2970     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2971       CommandLineFlags::printFlags();
2972       vm_exit(0);
2973     }
2974 
2975 #ifndef PRODUCT
2976     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2977       CommandLineFlags::printFlags(true);
2978       vm_exit(0);
2979     }
2980 #endif
2981   }
2982 
2983   if (IgnoreUnrecognizedVMOptions) {
2984     // uncast const to modify the flag args->ignoreUnrecognized
2985     *(jboolean*)(&args->ignoreUnrecognized) = true;
2986   }
2987 
2988   // Parse specified settings file
2989   if (settings_file_specified) {
2990     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2991       return JNI_EINVAL;
2992     }
2993   }
2994 
2995   // Parse default .hotspotrc settings file
2996   if (!settings_file_specified) {
2997     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2998       return JNI_EINVAL;
2999     }
3000   }
3001 
3002   if (PrintVMOptions) {
3003     for (index = 0; index < args->nOptions; index++) {
3004       const JavaVMOption *option = args->options + index;
3005       if (match_option(option, "-XX:", &tail)) {
3006         logOption(tail);
3007       }
3008     }
3009   }
3010 
3011   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3012   jint result = parse_vm_init_args(args);
3013   if (result != JNI_OK) {
3014     return result;
3015   }
3016 
3017 #ifndef PRODUCT
3018   if (TraceBytecodesAt != 0) {
3019     TraceBytecodes = true;
3020   }
3021   if (CountCompiledCalls) {
3022     if (UseCounterDecay) {
3023       warning("UseCounterDecay disabled because CountCalls is set");
3024       UseCounterDecay = false;
3025     }
3026   }
3027 #endif // PRODUCT
3028 
3029   if (EnableInvokeDynamic && !EnableMethodHandles) {
3030     if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
3031       warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
3032     }
3033     EnableMethodHandles = true;
3034   }
3035   if (EnableMethodHandles && !AnonymousClasses) {
3036     if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
3037       warning("forcing AnonymousClasses true because EnableMethodHandles is true");
3038     }
3039     AnonymousClasses = true;
3040   }
3041   if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
3042     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3043       warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
3044     }
3045     ScavengeRootsInCode = 1;
3046   }
3047 
3048   if (PrintGCDetails) {
3049     // Turn on -verbose:gc options as well
3050     PrintGC = true;
3051   }
3052 
3053   // Set object alignment values.
3054   set_object_alignment();
3055 
3056 #ifdef SERIALGC
3057   force_serial_gc();
3058 #endif // SERIALGC
3059 #ifdef KERNEL
3060   no_shared_spaces();
3061 #endif // KERNEL
3062 
3063   // Set flags based on ergonomics.
3064   set_ergonomics_flags();
3065 
3066   if (UseCompressedOops) {
3067     check_compressed_oops_compat();
3068   }
3069 
3070   // Check the GC selections again.
3071   if (!check_gc_consistency()) {
3072     return JNI_EINVAL;
3073   }
3074 
3075   if (TieredCompilation) {
3076     set_tiered_flags();
3077   } else {
3078     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3079     if (CompilationPolicyChoice >= 2) {
3080       vm_exit_during_initialization(
3081         "Incompatible compilation policy selected", NULL);
3082     }
3083   }
3084 
3085 #ifndef KERNEL
3086   if (UseConcMarkSweepGC) {
3087     // Set flags for CMS and ParNew.  Check UseConcMarkSweep first
3088     // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3089     // are true, we don't call set_parnew_gc_flags() as well.
3090     set_cms_and_parnew_gc_flags();
3091   } else {
3092     // Set heap size based on available physical memory
3093     set_heap_size();
3094     // Set per-collector flags
3095     if (UseParallelGC || UseParallelOldGC) {
3096       set_parallel_gc_flags();
3097     } else if (UseParNewGC) {
3098       set_parnew_gc_flags();
3099     } else if (UseG1GC) {
3100       set_g1_gc_flags();
3101     }
3102   }
3103 #endif // KERNEL
3104 
3105 #ifdef SERIALGC
3106   assert(verify_serial_gc_flags(), "SerialGC unset");
3107 #endif // SERIALGC
3108 
3109   // Set bytecode rewriting flags
3110   set_bytecode_flags();
3111 
3112   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3113   set_aggressive_opts_flags();
3114 
3115   // Turn off biased locking for locking debug mode flags,
3116   // which are subtlely different from each other but neither works with
3117   // biased locking.
3118   if (!UseFastLocking || UseHeavyMonitors) {
3119     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3120       // flag set to true on command line; warn the user that they
3121       // can't enable biased locking here
3122       warning("Biased Locking is not supported with locking debug flags"
3123               "; ignoring UseBiasedLocking flag." );
3124     }
3125     UseBiasedLocking = false;
3126   }
3127 
3128 #ifdef CC_INTERP
3129   // Clear flags not supported by the C++ interpreter
3130   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3131   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3132   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3133 #endif // CC_INTERP
3134 
3135 #ifdef COMPILER2
3136   if (!UseBiasedLocking || EmitSync != 0) {
3137     UseOptoBiasInlining = false;
3138   }
3139 #endif
3140 
3141   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3142     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3143     DebugNonSafepoints = true;
3144   }
3145 
3146 #ifndef PRODUCT
3147   if (CompileTheWorld) {
3148     // Force NmethodSweeper to sweep whole CodeCache each time.
3149     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3150       NmethodSweepFraction = 1;
3151     }
3152   }
3153 #endif
3154 
3155   if (PrintCommandLineFlags) {
3156     CommandLineFlags::printSetFlags();
3157   }
3158 
3159   // Apply CPU specific policy for the BiasedLocking
3160   if (UseBiasedLocking) {
3161     if (!VM_Version::use_biased_locking() &&
3162         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3163       UseBiasedLocking = false;
3164     }
3165   }
3166 
3167   return JNI_OK;
3168 }
3169 
3170 int Arguments::PropertyList_count(SystemProperty* pl) {
3171   int count = 0;
3172   while(pl != NULL) {
3173     count++;
3174     pl = pl->next();
3175   }
3176   return count;
3177 }
3178 
3179 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3180   assert(key != NULL, "just checking");
3181   SystemProperty* prop;
3182   for (prop = pl; prop != NULL; prop = prop->next()) {
3183     if (strcmp(key, prop->key()) == 0) return prop->value();
3184   }
3185   return NULL;
3186 }
3187 
3188 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3189   int count = 0;
3190   const char* ret_val = NULL;
3191 
3192   while(pl != NULL) {
3193     if(count >= index) {
3194       ret_val = pl->key();
3195       break;
3196     }
3197     count++;
3198     pl = pl->next();
3199   }
3200 
3201   return ret_val;
3202 }
3203 
3204 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3205   int count = 0;
3206   char* ret_val = NULL;
3207 
3208   while(pl != NULL) {
3209     if(count >= index) {
3210       ret_val = pl->value();
3211       break;
3212     }
3213     count++;
3214     pl = pl->next();
3215   }
3216 
3217   return ret_val;
3218 }
3219 
3220 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3221   SystemProperty* p = *plist;
3222   if (p == NULL) {
3223     *plist = new_p;
3224   } else {
3225     while (p->next() != NULL) {
3226       p = p->next();
3227     }
3228     p->set_next(new_p);
3229   }
3230 }
3231 
3232 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3233   if (plist == NULL)
3234     return;
3235 
3236   SystemProperty* new_p = new SystemProperty(k, v, true);
3237   PropertyList_add(plist, new_p);
3238 }
3239 
3240 // This add maintains unique property key in the list.
3241 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3242   if (plist == NULL)
3243     return;
3244 
3245   // If property key exist then update with new value.
3246   SystemProperty* prop;
3247   for (prop = *plist; prop != NULL; prop = prop->next()) {
3248     if (strcmp(k, prop->key()) == 0) {
3249       if (append) {
3250         prop->append_value(v);
3251       } else {
3252         prop->set_value(v);
3253       }
3254       return;
3255     }
3256   }
3257 
3258   PropertyList_add(plist, k, v);
3259 }
3260 
3261 #ifdef KERNEL
3262 char *Arguments::get_kernel_properties() {
3263   // Find properties starting with kernel and append them to string
3264   // We need to find out how long they are first because the URL's that they
3265   // might point to could get long.
3266   int length = 0;
3267   SystemProperty* prop;
3268   for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3269     if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3270       length += (strlen(prop->key()) + strlen(prop->value()) + 5);  // "-D ="
3271     }
3272   }
3273   // Add one for null terminator.
3274   char *props = AllocateHeap(length + 1, "get_kernel_properties");
3275   if (length != 0) {
3276     int pos = 0;
3277     for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3278       if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3279         jio_snprintf(&props[pos], length-pos,
3280                      "-D%s=%s ", prop->key(), prop->value());
3281         pos = strlen(props);
3282       }
3283     }
3284   }
3285   // null terminate props in case of null
3286   props[length] = '\0';
3287   return props;
3288 }
3289 #endif // KERNEL
3290 
3291 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3292 // Returns true if all of the source pointed by src has been copied over to
3293 // the destination buffer pointed by buf. Otherwise, returns false.
3294 // Notes:
3295 // 1. If the length (buflen) of the destination buffer excluding the
3296 // NULL terminator character is not long enough for holding the expanded
3297 // pid characters, it also returns false instead of returning the partially
3298 // expanded one.
3299 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3300 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3301                                 char* buf, size_t buflen) {
3302   const char* p = src;
3303   char* b = buf;
3304   const char* src_end = &src[srclen];
3305   char* buf_end = &buf[buflen - 1];
3306 
3307   while (p < src_end && b < buf_end) {
3308     if (*p == '%') {
3309       switch (*(++p)) {
3310       case '%':         // "%%" ==> "%"
3311         *b++ = *p++;
3312         break;
3313       case 'p':  {       //  "%p" ==> current process id
3314         // buf_end points to the character before the last character so
3315         // that we could write '\0' to the end of the buffer.
3316         size_t buf_sz = buf_end - b + 1;
3317         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3318 
3319         // if jio_snprintf fails or the buffer is not long enough to hold
3320         // the expanded pid, returns false.
3321         if (ret < 0 || ret >= (int)buf_sz) {
3322           return false;
3323         } else {
3324           b += ret;
3325           assert(*b == '\0', "fail in copy_expand_pid");
3326           if (p == src_end && b == buf_end + 1) {
3327             // reach the end of the buffer.
3328             return true;
3329           }
3330         }
3331         p++;
3332         break;
3333       }
3334       default :
3335         *b++ = '%';
3336       }
3337     } else {
3338       *b++ = *p++;
3339     }
3340   }
3341   *b = '\0';
3342   return (p == src_end); // return false if not all of the source was copied
3343 }