Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/javaAssertions.hpp"

 #include "compiler/compilerOracle.hpp"

 #include "memory/allocation.inline.hpp"

 #include "memory/cardTableRS.hpp"

 #include "memory/referenceProcessor.hpp"

 #include "memory/universe.inline.hpp"

 #include "oops/oop.inline.hpp"

 #include "prims/jvmtiExport.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/globals_extension.hpp"

 #include "runtime/java.hpp"

 #include "services/management.hpp"

 #include "utilities/defaultStream.hpp"

 #include "utilities/taskqueue.hpp"

 #ifdef TARGET_ARCH_x86

 # include "vm_version_x86.hpp"

 #endif

 #ifdef TARGET_ARCH_sparc

 # include "vm_version_sparc.hpp"

 #endif

 #ifdef TARGET_ARCH_zero

 # include "vm_version_zero.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_linux

 # include "os_linux.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_solaris

 # include "os_solaris.inline.hpp"

 #endif

 #ifdef TARGET_OS_FAMILY_windows

 # include "os_windows.inline.hpp"

 #endif

 #ifndef SERIALGC

 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"

 #endif

 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"

 #define DEFAULT_JAVA_LAUNCHER  "generic"

 char**  Arguments::_jvm_flags_array             = NULL;

 int     Arguments::_num_jvm_flags               = 0;

 char**  Arguments::_jvm_args_array              = NULL;

 int     Arguments::_num_jvm_args                = 0;

 char*  Arguments::_java_command                 = NULL;

 SystemProperty* Arguments::_system_properties   = NULL;

 const char*  Arguments::_gc_log_filename        = NULL;

 bool   Arguments::_has_profile                  = false;

 bool   Arguments::_has_alloc_profile            = false;

 uintx  Arguments::_min_heap_size                = 0;

 Arguments::Mode Arguments::_mode                = _mixed;

 bool   Arguments::_java_compiler                = false;

 bool   Arguments::_xdebug_mode                  = false;

 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;

 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;

 int    Arguments::_sun_java_launcher_pid        = -1;

 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)

 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;

 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;

 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;

 bool   Arguments::_ClipInlining                 = ClipInlining;

 char*  Arguments::SharedArchivePath             = NULL;

 AgentLibraryList Arguments::_libraryList;

 AgentLibraryList Arguments::_agentList;

 abort_hook_t     Arguments::_abort_hook         = NULL;

 exit_hook_t      Arguments::_exit_hook          = NULL;

 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;

 SystemProperty *Arguments::_java_ext_dirs = NULL;

 SystemProperty *Arguments::_java_endorsed_dirs = NULL;

 SystemProperty *Arguments::_sun_boot_library_path = NULL;

 SystemProperty *Arguments::_java_library_path = NULL;

 SystemProperty *Arguments::_java_home = NULL;

 SystemProperty *Arguments::_java_class_path = NULL;

 SystemProperty *Arguments::_sun_boot_class_path = NULL;

 char* Arguments::_meta_index_path = NULL;

 char* Arguments::_meta_index_dir = NULL;

 static bool force_client_mode = false;

 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string

 static bool match_option(const JavaVMOption *option, const char* name,

                          const char** tail) {

   int len = (int)strlen(name);

   if (strncmp(option->optionString, name, len) == 0) {

     *tail = option->optionString + len;

     return true;

   } else {

     return false;

   }

 }

 static void logOption(const char* opt) {

   if (PrintVMOptions) {

     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);

   }

 }

 // Process java launcher properties.

 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {

   // See if sun.java.launcher or sun.java.launcher.pid is defined.

   // Must do this before setting up other system properties,

   // as some of them may depend on launcher type.

   for (int index = 0; index < args->nOptions; index++) {

     const JavaVMOption* option = args->options + index;

     const char* tail;

     if (match_option(option, "-Dsun.java.launcher=", &tail)) {

       process_java_launcher_argument(tail, option->extraInfo);

       continue;

     }

     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {

       _sun_java_launcher_pid = atoi(tail);

       continue;

     }

   }

 }

 // Initialize system properties key and value.

 void Arguments::init_system_properties() {

   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",

                                                                  "Java Virtual Machine Specification",  false));

   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));

   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));

   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));

   // following are JVMTI agent writeable properties.

   // Properties values are set to NULL and they are

   // os specific they are initialized in os::init_system_properties_values().

   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);

   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);

   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);

   _java_library_path = new SystemProperty("java.library.path", NULL,  true);

   _java_home =  new SystemProperty("java.home", NULL,  true);

   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);

   _java_class_path = new SystemProperty("java.class.path", "",  true);

   // Add to System Property list.

   PropertyList_add(&_system_properties, _java_ext_dirs);

   PropertyList_add(&_system_properties, _java_endorsed_dirs);

   PropertyList_add(&_system_properties, _sun_boot_library_path);

   PropertyList_add(&_system_properties, _java_library_path);

   PropertyList_add(&_system_properties, _java_home);

   PropertyList_add(&_system_properties, _java_class_path);

   PropertyList_add(&_system_properties, _sun_boot_class_path);

   // Set OS specific system properties values

   os::init_system_properties_values();

 }

   // Update/Initialize System properties after JDK version number is known

 void Arguments::init_version_specific_system_properties() {

   enum { bufsz = 16 };

   char buffer[bufsz];

   const char* spec_vendor = "Sun Microsystems Inc.";

   uint32_t spec_version = 0;

   if (JDK_Version::is_gte_jdk17x_version()) {

     spec_vendor = "Oracle Corporation";

     spec_version = JDK_Version::current().major_version();

   }

   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);

   PropertyList_add(&_system_properties,

       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));

   PropertyList_add(&_system_properties,

       new SystemProperty("java.vm.specification.version", buffer, false));

   PropertyList_add(&_system_properties,

       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));

 }

 /**

  * Provide a slightly more user-friendly way of eliminating -XX flags.

  * When a flag is eliminated, it can be added to this list in order to

  * continue accepting this flag on the command-line, while issuing a warning

  * and ignoring the value.  Once the JDK version reaches the 'accept_until'

  * limit, we flatly refuse to admit the existence of the flag.  This allows

  * a flag to die correctly over JDK releases using HSX.

  */

 typedef struct {

   const char* name;

   JDK_Version obsoleted_in; // when the flag went away

   JDK_Version accept_until; // which version to start denying the existence

 } ObsoleteFlag;

 static ObsoleteFlag obsolete_jvm_flags[] = {

   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },

   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },

   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },

   { "DefaultInitialRAMFraction",

                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },

   { "UseDepthFirstScavengeOrder",

                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },

   { "HandlePromotionFailure",

                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },

   { "MaxLiveObjectEvacuationRatio",

                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },

   { NULL, JDK_Version(0), JDK_Version(0) }

 };

 // Returns true if the flag is obsolete and fits into the range specified

 // for being ignored.  In the case that the flag is ignored, the 'version'

 // value is filled in with the version number when the flag became

 // obsolete so that that value can be displayed to the user.

 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {

   int i = 0;

   assert(version != NULL, "Must provide a version buffer");

   while (obsolete_jvm_flags[i].name != NULL) {

     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];

     // <flag>=xxx form

     // [-|+]<flag> form

     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||

         ((s[0] == '+' || s[0] == '-') &&

         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {

       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {

           *version = flag_status.obsoleted_in;

           return true;

       }

     }

     i++;

   }

   return false;

 }

 // Constructs the system class path (aka boot class path) from the following

 // components, in order:

 //

 //     prefix           // from -Xbootclasspath/p:...

 //     endorsed         // the expansion of -Djava.endorsed.dirs=...

 //     base             // from os::get_system_properties() or -Xbootclasspath=

 //     suffix           // from -Xbootclasspath/a:...

 //

 // java.endorsed.dirs is a list of directories; any jar or zip files in the

 // directories are added to the sysclasspath just before the base.

 //

 // This could be AllStatic, but it isn't needed after argument processing is

 // complete.

 class SysClassPath: public StackObj {

 public:

   SysClassPath(const char* base);

   ~SysClassPath();

   inline void set_base(const char* base);

   inline void add_prefix(const char* prefix);

   inline void add_suffix_to_prefix(const char* suffix);

   inline void add_suffix(const char* suffix);

   inline void reset_path(const char* base);

   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs

   // property.  Must be called after all command-line arguments have been

   // processed (in particular, -Djava.endorsed.dirs=...) and before calling

   // combined_path().

   void expand_endorsed();

   inline const char* get_base()     const { return _items[_scp_base]; }

   inline const char* get_prefix()   const { return _items[_scp_prefix]; }

   inline const char* get_suffix()   const { return _items[_scp_suffix]; }

   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }

   // Combine all the components into a single c-heap-allocated string; caller

   // must free the string if/when no longer needed.

   char* combined_path();

 private:

   // Utility routines.

   static char* add_to_path(const char* path, const char* str, bool prepend);

   static char* add_jars_to_path(char* path, const char* directory);

   inline void reset_item_at(int index);

   // Array indices for the items that make up the sysclasspath.  All except the

   // base are allocated in the C heap and freed by this class.

   enum {

     _scp_prefix,        // from -Xbootclasspath/p:...

     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...

     _scp_base,          // the default sysclasspath

     _scp_suffix,        // from -Xbootclasspath/a:...

     _scp_nitems         // the number of items, must be last.

   };

   const char* _items[_scp_nitems];

   DEBUG_ONLY(bool _expansion_done;)

 };

 SysClassPath::SysClassPath(const char* base) {

   memset(_items, 0, sizeof(_items));

   _items[_scp_base] = base;

   DEBUG_ONLY(_expansion_done = false;)

 }

 SysClassPath::~SysClassPath() {

   // Free everything except the base.

   for (int i = 0; i < _scp_nitems; ++i) {

     if (i != _scp_base) reset_item_at(i);

   }

   DEBUG_ONLY(_expansion_done = false;)

 }

 inline void SysClassPath::set_base(const char* base) {

   _items[_scp_base] = base;

 }

 inline void SysClassPath::add_prefix(const char* prefix) {

   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);

 }

 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {

   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);

 }

 inline void SysClassPath::add_suffix(const char* suffix) {

   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);

 }

 inline void SysClassPath::reset_item_at(int index) {

   assert(index < _scp_nitems && index != _scp_base, "just checking");

   if (_items[index] != NULL) {

     FREE_C_HEAP_ARRAY(char, _items[index]);

     _items[index] = NULL;

   }

 }

 inline void SysClassPath::reset_path(const char* base) {

   // Clear the prefix and suffix.

   reset_item_at(_scp_prefix);

   reset_item_at(_scp_suffix);

   set_base(base);

 }

 //------------------------------------------------------------------------------

 void SysClassPath::expand_endorsed() {

   assert(_items[_scp_endorsed] == NULL, "can only be called once.");

   const char* path = Arguments::get_property("java.endorsed.dirs");

   if (path == NULL) {

     path = Arguments::get_endorsed_dir();

     assert(path != NULL, "no default for java.endorsed.dirs");

   }

   char* expanded_path = NULL;

   const char separator = *os::path_separator();

   const char* const end = path + strlen(path);

   while (path < end) {

     const char* tmp_end = strchr(path, separator);

     if (tmp_end == NULL) {

       expanded_path = add_jars_to_path(expanded_path, path);

       path = end;

     } else {

       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);

       memcpy(dirpath, path, tmp_end - path);

       dirpath[tmp_end - path] = '\0';

       expanded_path = add_jars_to_path(expanded_path, dirpath);

       FREE_C_HEAP_ARRAY(char, dirpath);

       path = tmp_end + 1;

     }

   }

   _items[_scp_endorsed] = expanded_path;

   DEBUG_ONLY(_expansion_done = true;)

 }

 // Combine the bootclasspath elements, some of which may be null, into a single

 // c-heap-allocated string.

 char* SysClassPath::combined_path() {

   assert(_items[_scp_base] != NULL, "empty default sysclasspath");

   assert(_expansion_done, "must call expand_endorsed() first.");

   size_t lengths[_scp_nitems];

   size_t total_len = 0;

   const char separator = *os::path_separator();

   // Get the lengths.

   int i;

   for (i = 0; i < _scp_nitems; ++i) {

     if (_items[i] != NULL) {

       lengths[i] = strlen(_items[i]);

       // Include space for the separator char (or a NULL for the last item).

       total_len += lengths[i] + 1;

     }

   }

   assert(total_len > 0, "empty sysclasspath not allowed");

   // Copy the _items to a single string.

   char* cp = NEW_C_HEAP_ARRAY(char, total_len);

   char* cp_tmp = cp;

   for (i = 0; i < _scp_nitems; ++i) {

     if (_items[i] != NULL) {

       memcpy(cp_tmp, _items[i], lengths[i]);

       cp_tmp += lengths[i];

       *cp_tmp++ = separator;

     }

   }

   *--cp_tmp = '\0';     // Replace the extra separator.

   return cp;

 }

 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.

 char*

 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {

   char *cp;

   assert(str != NULL, "just checking");

   if (path == NULL) {

     size_t len = strlen(str) + 1;

     cp = NEW_C_HEAP_ARRAY(char, len);

     memcpy(cp, str, len);                       // copy the trailing null

   } else {

     const char separator = *os::path_separator();

     size_t old_len = strlen(path);

     size_t str_len = strlen(str);

     size_t len = old_len + str_len + 2;

     if (prepend) {

       cp = NEW_C_HEAP_ARRAY(char, len);

       char* cp_tmp = cp;

       memcpy(cp_tmp, str, str_len);

       cp_tmp += str_len;

       *cp_tmp = separator;

       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null

       FREE_C_HEAP_ARRAY(char, path);

     } else {

       cp = REALLOC_C_HEAP_ARRAY(char, path, len);

       char* cp_tmp = cp + old_len;

       *cp_tmp = separator;

       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null

     }

   }

   return cp;

 }

 // Scan the directory and append any jar or zip files found to path.

 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.

 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {

   DIR* dir = os::opendir(directory);

   if (dir == NULL) return path;

   char dir_sep[2] = { '\0', '\0' };

   size_t directory_len = strlen(directory);

   const char fileSep = *os::file_separator();

   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;

   /* Scan the directory for jars/zips, appending them to path. */

   struct dirent *entry;

   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));

   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {

     const char* name = entry->d_name;

     const char* ext = name + strlen(name) - 4;

     bool isJarOrZip = ext > name &&

       (os::file_name_strcmp(ext, ".jar") == 0 ||

        os::file_name_strcmp(ext, ".zip") == 0);

     if (isJarOrZip) {

       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));

       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);

       path = add_to_path(path, jarpath, false);

       FREE_C_HEAP_ARRAY(char, jarpath);

     }

   }

   FREE_C_HEAP_ARRAY(char, dbuf);

   os::closedir(dir);

   return path;

 }

 // Parses a memory size specification string.

 static bool atomull(const char *s, julong* result) {

   julong n = 0;

   int args_read = sscanf(s, os::julong_format_specifier(), &n);

   if (args_read != 1) {

     return false;

   }

   while (*s != '\0' && isdigit(*s)) {

     s++;

   }

   // 4705540: illegal if more characters are found after the first non-digit

   if (strlen(s) > 1) {

     return false;

   }

   switch (*s) {

     case 'T': case 't':

       *result = n * G * K;

       // Check for overflow.

       if (*result/((julong)G * K) != n) return false;

       return true;

     case 'G': case 'g':

       *result = n * G;

       if (*result/G != n) return false;

       return true;

     case 'M': case 'm':

       *result = n * M;

       if (*result/M != n) return false;

       return true;

     case 'K': case 'k':

       *result = n * K;

       if (*result/K != n) return false;

       return true;

     case '\0':

       *result = n;

       return true;

     default:

       return false;

   }

 }

 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {

   if (size < min_size) return arg_too_small;

   // Check that size will fit in a size_t (only relevant on 32-bit)

   if (size > max_uintx) return arg_too_big;

   return arg_in_range;

 }

 // Describe an argument out of range error

 void Arguments::describe_range_error(ArgsRange errcode) {

   switch(errcode) {

   case arg_too_big:

     jio_fprintf(defaultStream::error_stream(),

                 "The specified size exceeds the maximum "

                 "representable size.\n");

     break;

   case arg_too_small:

   case arg_unreadable:

   case arg_in_range:

     // do nothing for now

     break;

   default:

     ShouldNotReachHere();

   }

 }

 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {

   return CommandLineFlags::boolAtPut(name, &value, origin);

 }

 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {

   double v;

   if (sscanf(value, "%lf", &v) != 1) {

     return false;

   }

   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {

     return true;

   }

   return false;

 }

 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {

   julong v;

   intx intx_v;

   bool is_neg = false;

   // Check the sign first since atomull() parses only unsigned values.

   if (*value == '-') {

     if (!CommandLineFlags::intxAt(name, &intx_v)) {

       return false;

     }

     value++;

     is_neg = true;

   }

   if (!atomull(value, &v)) {

     return false;

   }

   intx_v = (intx) v;

   if (is_neg) {

     intx_v = -intx_v;

   }

   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {

     return true;

   }

   uintx uintx_v = (uintx) v;

   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {

     return true;

   }

   uint64_t uint64_t_v = (uint64_t) v;

   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {

     return true;

   }

   return false;

 }

 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {

   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;

   // Contract:  CommandLineFlags always returns a pointer that needs freeing.

   FREE_C_HEAP_ARRAY(char, value);

   return true;

 }

 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {

   const char* old_value = "";

   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;

   size_t old_len = old_value != NULL ? strlen(old_value) : 0;

   size_t new_len = strlen(new_value);

   const char* value;

   char* free_this_too = NULL;

   if (old_len == 0) {

     value = new_value;

   } else if (new_len == 0) {

     value = old_value;

   } else {

     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);

     // each new setting adds another LINE to the switch:

     sprintf(buf, "%s\n%s", old_value, new_value);

     value = buf;

     free_this_too = buf;

   }

   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);

   // CommandLineFlags always returns a pointer that needs freeing.

   FREE_C_HEAP_ARRAY(char, value);

   if (free_this_too != NULL) {

     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.

     FREE_C_HEAP_ARRAY(char, free_this_too);

   }

   return true;

 }

 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {

   // range of acceptable characters spelled out for portability reasons

 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"

 #define BUFLEN 255

   char name[BUFLEN+1];

   char dummy;

   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {

     return set_bool_flag(name, false, origin);

   }

   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {

     return set_bool_flag(name, true, origin);

   }

   char punct;

   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {

     const char* value = strchr(arg, '=') + 1;

     Flag* flag = Flag::find_flag(name, strlen(name));

     if (flag != NULL && flag->is_ccstr()) {

       if (flag->ccstr_accumulates()) {

         return append_to_string_flag(name, value, origin);

       } else {

         if (value[0] == '\0') {

           value = NULL;

         }

         return set_string_flag(name, value, origin);

       }

     }

   }

   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {

     const char* value = strchr(arg, '=') + 1;

     // -XX:Foo:=xxx will reset the string flag to the given value.

     if (value[0] == '\0') {

       value = NULL;

     }

     return set_string_flag(name, value, origin);

   }

 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"

 #define SIGNED_NUMBER_RANGE    "[-0123456789]"

 #define        NUMBER_RANGE    "[0123456789]"

   char value[BUFLEN + 1];

   char value2[BUFLEN + 1];

   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {

     // Looks like a floating-point number -- try again with more lenient format string

     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {

       return set_fp_numeric_flag(name, value, origin);

     }

   }

 #define VALUE_RANGE "[-kmgtKMGT0123456789]"

   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {

     return set_numeric_flag(name, value, origin);

   }

   return false;

 }

 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {

   assert(bldarray != NULL, "illegal argument");

   if (arg == NULL) {

     return;

   }

   int index = *count;

   // expand the array and add arg to the last element

   (*count)++;

   if (*bldarray == NULL) {

     *bldarray = NEW_C_HEAP_ARRAY(char*, *count);

   } else {

     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);

   }

   (*bldarray)[index] = strdup(arg);

 }

 void Arguments::build_jvm_args(const char* arg) {

   add_string(&_jvm_args_array, &_num_jvm_args, arg);

 }

 void Arguments::build_jvm_flags(const char* arg) {

   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);

 }

 // utility function to return a string that concatenates all

 // strings in a given char** array

 const char* Arguments::build_resource_string(char** args, int count) {

   if (args == NULL || count == 0) {

     return NULL;

   }

   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator

   for (int i = 1; i < count; i++) {

     length += strlen(args[i]) + 1; // add 1 for a space

   }

   char* s = NEW_RESOURCE_ARRAY(char, length);

   strcpy(s, args[0]);

   for (int j = 1; j < count; j++) {

     strcat(s, " ");

     strcat(s, args[j]);

   }

   return (const char*) s;

 }

 void Arguments::print_on(outputStream* st) {

   st->print_cr("VM Arguments:");

   if (num_jvm_flags() > 0) {

     st->print("jvm_flags: "); print_jvm_flags_on(st);

   }

   if (num_jvm_args() > 0) {

     st->print("jvm_args: "); print_jvm_args_on(st);

   }

   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");

   st->print_cr("Launcher Type: %s", _sun_java_launcher);

 }

 void Arguments::print_jvm_flags_on(outputStream* st) {

   if (_num_jvm_flags > 0) {

     for (int i=0; i < _num_jvm_flags; i++) {

       st->print("%s ", _jvm_flags_array[i]);

     }

     st->print_cr("");

   }

 }

 void Arguments::print_jvm_args_on(outputStream* st) {

   if (_num_jvm_args > 0) {

     for (int i=0; i < _num_jvm_args; i++) {

       st->print("%s ", _jvm_args_array[i]);

     }

     st->print_cr("");

   }

 }

 bool Arguments::process_argument(const char* arg,

     jboolean ignore_unrecognized, FlagValueOrigin origin) {

   JDK_Version since = JDK_Version();

   if (parse_argument(arg, origin)) {

     // do nothing

   } else if (is_newly_obsolete(arg, &since)) {

     enum { bufsize = 256 };

     char buffer[bufsize];

     since.to_string(buffer, bufsize);

     jio_fprintf(defaultStream::error_stream(),

       "Warning: The flag %s has been EOL'd as of %s and will"

       " be ignored\n", arg, buffer);

   } else {

     if (!ignore_unrecognized) {

       jio_fprintf(defaultStream::error_stream(),

                   "Unrecognized VM option '%s'\n", arg);

       // allow for commandline "commenting out" options like -XX:#+Verbose

       if (strlen(arg) == 0 || arg[0] != '#') {

         return false;

       }

     }

   }

   return true;

 }

 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {

   FILE* stream = fopen(file_name, "rb");

   if (stream == NULL) {

     if (should_exist) {

       jio_fprintf(defaultStream::error_stream(),

                   "Could not open settings file %s\n", file_name);

       return false;

     } else {

       return true;

     }

   }

   char token[1024];

   int  pos = 0;

   bool in_white_space = true;

   bool in_comment     = false;

   bool in_quote       = false;

   char quote_c        = 0;

   bool result         = true;

   int c = getc(stream);

   while(c != EOF) {

     if (in_white_space) {

       if (in_comment) {

         if (c == '\n') in_comment = false;

       } else {

         if (c == '#') in_comment = true;

         else if (!isspace(c)) {

           in_white_space = false;

           token[pos++] = c;

         }

       }

     } else {

       if (c == '\n' || (!in_quote && isspace(c))) {

         // token ends at newline, or at unquoted whitespace

         // this allows a way to include spaces in string-valued options

         token[pos] = '\0';

         logOption(token);

         result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);

         build_jvm_flags(token);

         pos = 0;

         in_white_space = true;

         in_quote = false;

       } else if (!in_quote && (c == '\'' || c == '"')) {

         in_quote = true;

         quote_c = c;

       } else if (in_quote && (c == quote_c)) {

         in_quote = false;

       } else {

         token[pos++] = c;

       }

     }

     c = getc(stream);

   }

   if (pos > 0) {

     token[pos] = '\0';

     result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);

     build_jvm_flags(token);

   }

   fclose(stream);

   return result;

 }

 //=============================================================================================================

 // Parsing of properties (-D)

 const char* Arguments::get_property(const char* key) {

   return PropertyList_get_value(system_properties(), key);

 }

 bool Arguments::add_property(const char* prop) {

   const char* eq = strchr(prop, '=');

   char* key;

   // ns must be static--its address may be stored in a SystemProperty object.

   const static char ns[1] = {0};

   char* value = (char *)ns;

   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);

   key = AllocateHeap(key_len + 1, "add_property");

   strncpy(key, prop, key_len);

   key[key_len] = '\0';

   if (eq != NULL) {

     size_t value_len = strlen(prop) - key_len - 1;

     value = AllocateHeap(value_len + 1, "add_property");

     strncpy(value, &prop[key_len + 1], value_len + 1);

   }

   if (strcmp(key, "java.compiler") == 0) {

     process_java_compiler_argument(value);

     FreeHeap(key);

     if (eq != NULL) {

       FreeHeap(value);

     }

     return true;

   } else if (strcmp(key, "sun.java.command") == 0) {

     _java_command = value;

     // don't add this property to the properties exposed to the java application

     FreeHeap(key);

     return true;

   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {

     // launcher.pid property is private and is processed

     // in process_sun_java_launcher_properties();

     // the sun.java.launcher property is passed on to the java application

     FreeHeap(key);

     if (eq != NULL) {

       FreeHeap(value);

     }

     return true;

   } else if (strcmp(key, "java.vendor.url.bug") == 0) {

     // save it in _java_vendor_url_bug, so JVM fatal error handler can access

     // its value without going through the property list or making a Java call.

     _java_vendor_url_bug = value;

   } else if (strcmp(key, "sun.boot.library.path") == 0) {

     PropertyList_unique_add(&_system_properties, key, value, true);

     return true;

   }

   // Create new property and add at the end of the list

   PropertyList_unique_add(&_system_properties, key, value);

   return true;

 }

 //===========================================================================================================

 // Setting int/mixed/comp mode flags

 void Arguments::set_mode_flags(Mode mode) {

   // Set up default values for all flags.

   // If you add a flag to any of the branches below,

   // add a default value for it here.

   set_java_compiler(false);

   _mode                      = mode;

   // Ensure Agent_OnLoad has the correct initial values.

   // This may not be the final mode; mode may change later in onload phase.

   PropertyList_unique_add(&_system_properties, "java.vm.info",

                           (char*)Abstract_VM_Version::vm_info_string(), false);

   UseInterpreter             = true;

   UseCompiler                = true;

   UseLoopCounter             = true;

   // Default values may be platform/compiler dependent -

   // use the saved values

   ClipInlining               = Arguments::_ClipInlining;

   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;

   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;

   BackgroundCompilation      = Arguments::_BackgroundCompilation;

   // Change from defaults based on mode

   switch (mode) {

   default:

     ShouldNotReachHere();

     break;

   case _int:

     UseCompiler              = false;

     UseLoopCounter           = false;

     AlwaysCompileLoopMethods = false;

     UseOnStackReplacement    = false;

     break;

   case _mixed:

     // same as default

     break;

   case _comp:

     UseInterpreter           = false;

     BackgroundCompilation    = false;

     ClipInlining             = false;

     break;

   }

 }

 // Conflict: required to use shared spaces (-Xshare:on), but

 // incompatible command line options were chosen.

 static void no_shared_spaces() {

   if (RequireSharedSpaces) {

     jio_fprintf(defaultStream::error_stream(),

       "Class data sharing is inconsistent with other specified options.\n");

     vm_exit_during_initialization("Unable to use shared archive.", NULL);

   } else {

     FLAG_SET_DEFAULT(UseSharedSpaces, false);

   }

 }

 void Arguments::check_compressed_oops_compat() {

 #ifdef _LP64

   assert(UseCompressedOops, "Precondition");

 #  if defined(COMPILER1) && !defined(TIERED)

   // Until c1 supports compressed oops turn them off.

   FLAG_SET_DEFAULT(UseCompressedOops, false);

 #  else

   // Is it on by default or set on ergonomically

   bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops);

   // Tiered currently doesn't work with compressed oops

   if (TieredCompilation) {

     if (is_on_by_default) {

       FLAG_SET_DEFAULT(UseCompressedOops, false);

       return;

     } else {

       vm_exit_during_initialization(

         "Tiered compilation is not supported with compressed oops yet", NULL);

     }

   }

   // If dumping an archive or forcing its use, disable compressed oops if possible

   if (DumpSharedSpaces || RequireSharedSpaces) {

     if (is_on_by_default) {

       FLAG_SET_DEFAULT(UseCompressedOops, false);

       return;

     } else {

       vm_exit_during_initialization(

         "Class Data Sharing is not supported with compressed oops yet", NULL);

     }

   } else if (UseSharedSpaces) {

     // UseSharedSpaces is on by default. With compressed oops, we turn it off.

     FLAG_SET_DEFAULT(UseSharedSpaces, false);

   }

 #  endif // defined(COMPILER1) && !defined(TIERED)

 #endif // _LP64

 }

 void Arguments::set_tiered_flags() {

   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {

     FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);

   }

   if (CompilationPolicyChoice < 2) {

     vm_exit_during_initialization(

       "Incompatible compilation policy selected", NULL);

   }

   // Increase the code cache size - tiered compiles a lot more.

   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {

     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);

   }

 }

 #ifndef KERNEL

 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC

 // if it's not explictly set or unset. If the user has chosen

 // UseParNewGC and not explicitly set ParallelGCThreads we

 // set it, unless this is a single cpu machine.

 void Arguments::set_parnew_gc_flags() {

   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,

          "control point invariant");

   assert(UseParNewGC, "Error");

   // Turn off AdaptiveSizePolicy by default for parnew until it is

   // complete.

   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {

     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);

   }

   if (ParallelGCThreads == 0) {

     FLAG_SET_DEFAULT(ParallelGCThreads,

                      Abstract_VM_Version::parallel_worker_threads());

     if (ParallelGCThreads == 1) {

       FLAG_SET_DEFAULT(UseParNewGC, false);

       FLAG_SET_DEFAULT(ParallelGCThreads, 0);

     }

   }

   if (UseParNewGC) {

     // CDS doesn't work with ParNew yet

     no_shared_spaces();

     // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,

     // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration

     // we set them to 1024 and 1024.

     // See CR 6362902.

     if (FLAG_IS_DEFAULT(YoungPLABSize)) {

       FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);

     }

     if (FLAG_IS_DEFAULT(OldPLABSize)) {

       FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);

     }

     // AlwaysTenure flag should make ParNew promote all at first collection.

     // See CR 6362902.

     if (AlwaysTenure) {

       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);

     }

     // When using compressed oops, we use local overflow stacks,

     // rather than using a global overflow list chained through

     // the klass word of the object's pre-image.

     if (UseCompressedOops && !ParGCUseLocalOverflow) {

       if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {

         warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");

       }

       FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);

     }

     assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");

   }

 }

 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on

 // sparc/solaris for certain applications, but would gain from

 // further optimization and tuning efforts, and would almost

 // certainly gain from analysis of platform and environment.

 void Arguments::set_cms_and_parnew_gc_flags() {

   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");

   assert(UseConcMarkSweepGC, "CMS is expected to be on here");

   // If we are using CMS, we prefer to UseParNewGC,

   // unless explicitly forbidden.

   if (FLAG_IS_DEFAULT(UseParNewGC)) {

     FLAG_SET_ERGO(bool, UseParNewGC, true);

   }

   // Turn off AdaptiveSizePolicy by default for cms until it is

   // complete.

   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {

     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);

   }

   // In either case, adjust ParallelGCThreads and/or UseParNewGC

   // as needed.

   if (UseParNewGC) {

     set_parnew_gc_flags();

   }

   // Now make adjustments for CMS

   size_t young_gen_per_worker;

   intx new_ratio;

   size_t min_new_default;

   intx tenuring_default;

   if (CMSUseOldDefaults) {  // old defaults: "old" as of 6.0

     if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {

       FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);

     }

     young_gen_per_worker = 4*M;

     new_ratio = (intx)15;

     min_new_default = 4*M;

     tenuring_default = (intx)0;

   } else { // new defaults: "new" as of 6.0

     young_gen_per_worker = CMSYoungGenPerWorker;

     new_ratio = (intx)7;

     min_new_default = 16*M;

     tenuring_default = (intx)4;

   }

   // Preferred young gen size for "short" pauses

   const uintx parallel_gc_threads =

     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);

   const size_t preferred_max_new_size_unaligned =

     ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);

   const size_t preferred_max_new_size =

     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());

   // Unless explicitly requested otherwise, size young gen

   // for "short" pauses ~ 4M*ParallelGCThreads

   // If either MaxNewSize or NewRatio is set on the command line,

   // assume the user is trying to set the size of the young gen.

   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {

     // Set MaxNewSize to our calculated preferred_max_new_size unless

     // NewSize was set on the command line and it is larger than

     // preferred_max_new_size.

     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line

       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));

     } else {

       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);

     }

     if (PrintGCDetails && Verbose) {

       // Too early to use gclog_or_tty

       tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);

     }

     // Unless explicitly requested otherwise, prefer a large

     // Old to Young gen size so as to shift the collection load

     // to the old generation concurrent collector

     // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)

     // then NewSize and OldSize may be calculated.  That would

     // generally lead to some differences with ParNewGC for which

     // there was no obvious reason.  Also limit to the case where

     // MaxNewSize has not been set.

     FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));

     // Code along this path potentially sets NewSize and OldSize

     // Calculate the desired minimum size of the young gen but if

     // NewSize has been set on the command line, use it here since

     // it should be the final value.

     size_t min_new;

     if (FLAG_IS_DEFAULT(NewSize)) {

       min_new = align_size_up(ScaleForWordSize(min_new_default),

                               os::vm_page_size());

     } else {

       min_new = NewSize;

     }

     size_t prev_initial_size = InitialHeapSize;

     if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {

       FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);

       // Currently minimum size and the initial heap sizes are the same.

       set_min_heap_size(InitialHeapSize);

       if (PrintGCDetails && Verbose) {

         warning("Initial heap size increased to " SIZE_FORMAT " M from "

                 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",

                 InitialHeapSize/M, prev_initial_size/M);

       }

     }

     // MaxHeapSize is aligned down in collectorPolicy

     size_t max_heap =

       align_size_down(MaxHeapSize,

                       CardTableRS::ct_max_alignment_constraint());

     if (PrintGCDetails && Verbose) {

       // Too early to use gclog_or_tty

       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT

            " initial_heap_size:  " SIZE_FORMAT

            " max_heap: " SIZE_FORMAT,

            min_heap_size(), InitialHeapSize, max_heap);

     }

     if (max_heap > min_new) {

       // Unless explicitly requested otherwise, make young gen

       // at least min_new, and at most preferred_max_new_size.

       if (FLAG_IS_DEFAULT(NewSize)) {

         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));

         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));

         if (PrintGCDetails && Verbose) {

           // Too early to use gclog_or_tty

           tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);

         }

       }

       // Unless explicitly requested otherwise, size old gen

       // so that it's at least 3X of NewSize to begin with;

       // later NewRatio will decide how it grows; see above.

       if (FLAG_IS_DEFAULT(OldSize)) {

         if (max_heap > NewSize) {

           FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));

           if (PrintGCDetails && Verbose) {

             // Too early to use gclog_or_tty

             tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);

           }

         }

       }

     }

   }

   // Unless explicitly requested otherwise, definitely

   // promote all objects surviving "tenuring_default" scavenges.

   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&

       FLAG_IS_DEFAULT(SurvivorRatio)) {

     FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);

   }

   // If we decided above (or user explicitly requested)

   // `promote all' (via MaxTenuringThreshold := 0),

   // prefer minuscule survivor spaces so as not to waste

   // space for (non-existent) survivors

   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {

     FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));

   }

   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,

   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.

   // This is done in order to make ParNew+CMS configuration to work

   // with YoungPLABSize and OldPLABSize options.

   // See CR 6362902.

   if (!FLAG_IS_DEFAULT(OldPLABSize)) {

     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {

       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim

       // is.  In this situtation let CMSParPromoteBlocksToClaim follow

       // the value (either from the command line or ergonomics) of

       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.

       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);

     } else {

       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.

       // CMSParPromoteBlocksToClaim is a collector-specific flag, so

       // we'll let it to take precedence.

       jio_fprintf(defaultStream::error_stream(),

                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"

                   " options are specified for the CMS collector."

                   " CMSParPromoteBlocksToClaim will take precedence.\n");

     }

   }

   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {

     // OldPLAB sizing manually turned off: Use a larger default setting,

     // unless it was manually specified. This is because a too-low value

     // will slow down scavenges.

     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {

       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166

     }

   }

   // Overwrite OldPLABSize which is the variable we will internally use everywhere.

   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);

   // If either of the static initialization defaults have changed, note this

   // modification.

   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {

     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);

   }

   if (PrintGCDetails && Verbose) {

     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",

       MarkStackSize / K, MarkStackSizeMax / K);

     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);

   }

 }

 #endif // KERNEL

 void set_object_alignment() {

   // Object alignment.

   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");

   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;

   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");

   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;

   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");

   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;

   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);

   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;

   // Oop encoding heap max

   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;

 #ifndef KERNEL

   // Set CMS global values

   CompactibleFreeListSpace::set_cms_values();

 #endif // KERNEL

 }

 bool verify_object_alignment() {

   // Object alignment.

   if (!is_power_of_2(ObjectAlignmentInBytes)) {

     jio_fprintf(defaultStream::error_stream(),

                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",

                 (int)ObjectAlignmentInBytes);

     return false;

   }

   if ((int)ObjectAlignmentInBytes < BytesPerLong) {

     jio_fprintf(defaultStream::error_stream(),

                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",

                 (int)ObjectAlignmentInBytes, BytesPerLong);

     return false;

   }

   // It does not make sense to have big object alignment

   // since a space lost due to alignment will be greater

   // then a saved space from compressed oops.

   if ((int)ObjectAlignmentInBytes > 256) {

     jio_fprintf(defaultStream::error_stream(),

                 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",

                 (int)ObjectAlignmentInBytes);

     return false;

   }

   // In case page size is very small.

   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {

     jio_fprintf(defaultStream::error_stream(),

                 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",

                 (int)ObjectAlignmentInBytes, os::vm_page_size());

     return false;

   }

   return true;

 }

 inline uintx max_heap_for_compressed_oops() {

   // Avoid sign flip.

   if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {

     return 0;

   }

   LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());

   NOT_LP64(ShouldNotReachHere(); return 0);

 }

 bool Arguments::should_auto_select_low_pause_collector() {

   if (UseAutoGCSelectPolicy &&

       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&

       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {

     if (PrintGCDetails) {

       // Cannot use gclog_or_tty yet.

       tty->print_cr("Automatic selection of the low pause collector"

        " based on pause goal of %d (ms)", MaxGCPauseMillis);

     }

     return true;

   }

   return false;

 }

 void Arguments::set_ergonomics_flags() {

   // Parallel GC is not compatible with sharing. If one specifies

   // that they want sharing explicitly, do not set ergonomics flags.

   if (DumpSharedSpaces || ForceSharedSpaces) {

     return;

   }

   if (os::is_server_class_machine() && !force_client_mode ) {

     // If no other collector is requested explicitly,

     // let the VM select the collector based on

     // machine class and automatic selection policy.

     if (!UseSerialGC &&

         !UseConcMarkSweepGC &&

         !UseG1GC &&

         !UseParNewGC &&

         !DumpSharedSpaces &&

         FLAG_IS_DEFAULT(UseParallelGC)) {

       if (should_auto_select_low_pause_collector()) {

         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);

       } else {

         FLAG_SET_ERGO(bool, UseParallelGC, true);

       }

       no_shared_spaces();

     }

   }

 #ifndef ZERO

 #ifdef _LP64

   // Check that UseCompressedOops can be set with the max heap size allocated

   // by ergonomics.

   if (MaxHeapSize <= max_heap_for_compressed_oops()) {

 #if !defined(COMPILER1) || defined(TIERED)

     if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {

       FLAG_SET_ERGO(bool, UseCompressedOops, true);

     }

 #endif

 #ifdef _WIN64

     if (UseLargePages && UseCompressedOops) {

       // Cannot allocate guard pages for implicit checks in indexed addressing

       // mode, when large pages are specified on windows.

       // This flag could be switched ON if narrow oop base address is set to 0,

       // see code in Universe::initialize_heap().

       Universe::set_narrow_oop_use_implicit_null_checks(false);

     }

 #endif //  _WIN64

   } else {

     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {

       warning("Max heap size too large for Compressed Oops");

       FLAG_SET_DEFAULT(UseCompressedOops, false);

     }

   }

   // Also checks that certain machines are slower with compressed oops

   // in vm_version initialization code.

 #endif // _LP64

 #endif // !ZERO

 }

 void Arguments::set_parallel_gc_flags() {

   assert(UseParallelGC || UseParallelOldGC, "Error");

   // If parallel old was requested, automatically enable parallel scavenge.

   if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {

     FLAG_SET_DEFAULT(UseParallelGC, true);

   }

   // If no heap maximum was requested explicitly, use some reasonable fraction

   // of the physical memory, up to a maximum of 1GB.

   if (UseParallelGC) {

     FLAG_SET_ERGO(uintx, ParallelGCThreads,

                   Abstract_VM_Version::parallel_worker_threads());

     // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the

     // SurvivorRatio has been set, reset their default values to SurvivorRatio +

     // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.

     // See CR 6362902 for details.

     if (!FLAG_IS_DEFAULT(SurvivorRatio)) {

       if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {

          FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);

       }

       if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {

         FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);

       }

     }

     if (UseParallelOldGC) {

       // Par compact uses lower default values since they are treated as

       // minimums.  These are different defaults because of the different

       // interpretation and are not ergonomically set.

       if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {

         FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);

       }

       if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {

         FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);

       }

     }

   }

 }

 void Arguments::set_g1_gc_flags() {

   assert(UseG1GC, "Error");

 #ifdef COMPILER1

   FastTLABRefill = false;

 #endif

   FLAG_SET_DEFAULT(ParallelGCThreads,

                      Abstract_VM_Version::parallel_worker_threads());

   if (ParallelGCThreads == 0) {

     FLAG_SET_DEFAULT(ParallelGCThreads,

                      Abstract_VM_Version::parallel_worker_threads());

   }

   no_shared_spaces();

   if (FLAG_IS_DEFAULT(MarkStackSize)) {

     FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);

   }

   if (PrintGCDetails && Verbose) {

     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",

       MarkStackSize / K, MarkStackSizeMax / K);

     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);

   }

   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {

     // In G1, we want the default GC overhead goal to be higher than

     // say in PS. So we set it here to 10%. Otherwise the heap might

     // be expanded more aggressively than we would like it to. In

     // fact, even 10% seems to not be high enough in some cases

     // (especially small GC stress tests that the main thing they do

     // is allocation). We might consider increase it further.

     FLAG_SET_DEFAULT(GCTimeRatio, 9);

   }

 }

 void Arguments::set_heap_size() {

   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {

     // Deprecated flag

     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);

   }

   const julong phys_mem =

     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)

                             : (julong)MaxRAM;

   // If the maximum heap size has not been set with -Xmx,

   // then set it as fraction of the size of physical memory,

   // respecting the maximum and minimum sizes of the heap.

   if (FLAG_IS_DEFAULT(MaxHeapSize)) {

     julong reasonable_max = phys_mem / MaxRAMFraction;

     if (phys_mem <= MaxHeapSize * MinRAMFraction) {

       // Small physical memory, so use a minimum fraction of it for the heap

       reasonable_max = phys_mem / MinRAMFraction;

     } else {

       // Not-small physical memory, so require a heap at least

       // as large as MaxHeapSize

       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);

     }

     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {

       // Limit the heap size to ErgoHeapSizeLimit

       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);

     }

     if (UseCompressedOops) {

       // Limit the heap size to the maximum possible when using compressed oops

       julong max_coop_heap = (julong)max_heap_for_compressed_oops();

       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {

         // Heap should be above HeapBaseMinAddress to get zero based compressed oops

         // but it should be not less than default MaxHeapSize.

         max_coop_heap -= HeapBaseMinAddress;

       }

       reasonable_max = MIN2(reasonable_max, max_coop_heap);

     }

     reasonable_max = os::allocatable_physical_memory(reasonable_max);

     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {

       // An initial heap size was specified on the command line,

       // so be sure that the maximum size is consistent.  Done

       // after call to allocatable_physical_memory because that

       // method might reduce the allocation size.

       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);

     }

     if (PrintGCDetails && Verbose) {

       // Cannot use gclog_or_tty yet.

       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);

     }

     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);

   }

   // If the initial_heap_size has not been set with InitialHeapSize

   // or -Xms, then set it as fraction of the size of physical memory,

   // respecting the maximum and minimum sizes of the heap.

   if (FLAG_IS_DEFAULT(InitialHeapSize)) {

     julong reasonable_minimum = (julong)(OldSize + NewSize);

     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);

     reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);

     julong reasonable_initial = phys_mem / InitialRAMFraction;

     reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);

     reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);

     reasonable_initial = os::allocatable_physical_memory(reasonable_initial);

     if (PrintGCDetails && Verbose) {

       // Cannot use gclog_or_tty yet.

       tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);

       tty->print_cr("  Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);

     }

     FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);

     set_min_heap_size((uintx)reasonable_minimum);

   }

 }

 // This must be called after ergonomics because we want bytecode rewriting

 // if the server compiler is used, or if UseSharedSpaces is disabled.

 void Arguments::set_bytecode_flags() {

   // Better not attempt to store into a read-only space.

   if (UseSharedSpaces) {

     FLAG_SET_DEFAULT(RewriteBytecodes, false);

     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);

   }

   if (!RewriteBytecodes) {

     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);

   }

 }

 // Aggressive optimization flags  -XX:+AggressiveOpts

 void Arguments::set_aggressive_opts_flags() {

 #ifdef COMPILER2

   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {

     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {

       FLAG_SET_DEFAULT(EliminateAutoBox, true);

     }

     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {

       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);

     }

     // Feed the cache size setting into the JDK

     char buffer[1024];

     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);

     add_property(buffer);

   }

   if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {

     FLAG_SET_DEFAULT(DoEscapeAnalysis, true);

   }

   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {

     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);

   }

   if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {

     FLAG_SET_DEFAULT(OptimizeStringConcat, true);

   }

   if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {

     FLAG_SET_DEFAULT(OptimizeFill, true);

   }

 #endif

   if (AggressiveOpts) {

 // Sample flag setting code

 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {

 //      FLAG_SET_DEFAULT(EliminateZeroing, true);

 //    }

   }

 }

 //===========================================================================================================

 // Parsing of java.compiler property

 void Arguments::process_java_compiler_argument(char* arg) {

   // For backwards compatibility, Djava.compiler=NONE or ""

   // causes us to switch to -Xint mode UNLESS -Xdebug

   // is also specified.

   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {

     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.

   }

 }

 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {

   _sun_java_launcher = strdup(launcher);

 }

 bool Arguments::created_by_java_launcher() {

   assert(_sun_java_launcher != NULL, "property must have value");

   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;

 }

 //===========================================================================================================

 // Parsing of main arguments

 bool Arguments::verify_interval(uintx val, uintx min,

                                 uintx max, const char* name) {

   // Returns true iff value is in the inclusive interval [min..max]

   // false, otherwise.

   if (val >= min && val <= max) {

     return true;

   }

   jio_fprintf(defaultStream::error_stream(),

               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT

               " and " UINTX_FORMAT "\n",

               name, val, min, max);

   return false;

 }

 bool Arguments::verify_min_value(intx val, intx min, const char* name) {

   // Returns true if given value is greater than specified min threshold

   // false, otherwise.

   if (val >= min ) {

       return true;

   }

   jio_fprintf(defaultStream::error_stream(),

               "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",

               name, val, min);

   return false;

 }

 bool Arguments::verify_percentage(uintx value, const char* name) {

   if (value <= 100) {

     return true;

   }

   jio_fprintf(defaultStream::error_stream(),

               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",

               name, value);

   return false;

 }

 static void force_serial_gc() {

   FLAG_SET_DEFAULT(UseSerialGC, true);

   FLAG_SET_DEFAULT(UseParNewGC, false);

   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);

   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption

   FLAG_SET_DEFAULT(UseParallelGC, false);

   FLAG_SET_DEFAULT(UseParallelOldGC, false);

   FLAG_SET_DEFAULT(UseG1GC, false);

 }

 static bool verify_serial_gc_flags() {

   return (UseSerialGC &&

         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||

           UseParallelGC || UseParallelOldGC));

 }

 // Check consistency of GC selection

 bool Arguments::check_gc_consistency() {

   bool status = true;

   // Ensure that the user has not selected conflicting sets

   // of collectors. [Note: this check is merely a user convenience;

   // collectors over-ride each other so that only a non-conflicting

   // set is selected; however what the user gets is not what they

   // may have expected from the combination they asked for. It's

   // better to reduce user confusion by not allowing them to

   // select conflicting combinations.

   uint i = 0;

   if (UseSerialGC)                       i++;

   if (UseConcMarkSweepGC || UseParNewGC) i++;

   if (UseParallelGC || UseParallelOldGC) i++;

   if (UseG1GC)                           i++;

   if (i > 1) {

     jio_fprintf(defaultStream::error_stream(),

                 "Conflicting collector combinations in option list; "

                 "please refer to the release notes for the combinations "

                 "allowed\n");

     status = false;

   }

   return status;

 }

 // Check stack pages settings

 bool Arguments::check_stack_pages()

 {

   bool status = true;

   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");

   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");

   // greater stack shadow pages can't generate instruction to bang stack

   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");

   return status;

 }

 // Check the consistency of vm_init_args

 bool Arguments::check_vm_args_consistency() {

   // Method for adding checks for flag consistency.

   // The intent is to warn the user of all possible conflicts,

   // before returning an error.

   // Note: Needs platform-dependent factoring.

   bool status = true;

 #if ( (defined(COMPILER2) && defined(SPARC)))

   // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init

   // on sparc doesn't require generation of a stub as is the case on, e.g.,

   // x86.  Normally, VM_Version_init must be called from init_globals in

   // init.cpp, which is called by the initial java thread *after* arguments

   // have been parsed.  VM_Version_init gets called twice on sparc.

   extern void VM_Version_init();

   VM_Version_init();

   if (!VM_Version::has_v9()) {

     jio_fprintf(defaultStream::error_stream(),

                 "V8 Machine detected, Server requires V9\n");

     status = false;

   }

 #endif /* COMPILER2 && SPARC */

   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product

   // builds so the cost of stack banging can be measured.

 #if (defined(PRODUCT) && defined(SOLARIS))

   if (!UseBoundThreads && !UseStackBanging) {

     jio_fprintf(defaultStream::error_stream(),

                 "-UseStackBanging conflicts with -UseBoundThreads\n");

      status = false;

   }

 #endif

   if (TLABRefillWasteFraction == 0) {

     jio_fprintf(defaultStream::error_stream(),

                 "TLABRefillWasteFraction should be a denominator, "

                 "not " SIZE_FORMAT "\n",

                 TLABRefillWasteFraction);

     status = false;

   }

   status = status && verify_percentage(AdaptiveSizePolicyWeight,

                               "AdaptiveSizePolicyWeight");

   status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");

   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");

   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");

   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");

   if (MinHeapFreeRatio > MaxHeapFreeRatio) {

     jio_fprintf(defaultStream::error_stream(),

                 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "

                 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",

                 MinHeapFreeRatio, MaxHeapFreeRatio);

     status = false;

   }

   // Keeping the heap 100% free is hard ;-) so limit it to 99%.

   MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);

   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {

     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.

   }

   if (UseParallelOldGC && ParallelOldGCSplitALot) {

     // Settings to encourage splitting.

     if (!FLAG_IS_CMDLINE(NewRatio)) {

       FLAG_SET_CMDLINE(intx, NewRatio, 2);

     }

     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {

       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);

     }

   }

   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");

   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");

   if (GCTimeLimit == 100) {

     // Turn off gc-overhead-limit-exceeded checks

     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);

   }

   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");

   // Check whether user-specified sharing option conflicts with GC or page size.

   // Both sharing and large pages are enabled by default on some platforms;

   // large pages override sharing only if explicitly set on the command line.

   const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||

           UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||

           UseLargePages && FLAG_IS_CMDLINE(UseLargePages);

   if (cannot_share) {

     // Either force sharing on by forcing the other options off, or

     // force sharing off.

     if (DumpSharedSpaces || ForceSharedSpaces) {

       jio_fprintf(defaultStream::error_stream(),

                   "Using Serial GC and default page size because of %s\n",

                   ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");

       force_serial_gc();

       FLAG_SET_DEFAULT(UseLargePages, false);

     } else {

       if (UseSharedSpaces && Verbose) {

         jio_fprintf(defaultStream::error_stream(),

                     "Turning off use of shared archive because of "

                     "choice of garbage collector or large pages\n");

       }

       no_shared_spaces();

     }

   } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {

     FLAG_SET_DEFAULT(UseLargePages, false);

   }

   status = status && check_gc_consistency();

   status = status && check_stack_pages();

   if (_has_alloc_profile) {

     if (UseParallelGC || UseParallelOldGC) {

       jio_fprintf(defaultStream::error_stream(),

                   "error:  invalid argument combination.\n"

                   "Allocation profiling (-Xaprof) cannot be used together with "

                   "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");

       status = false;

     }

     if (UseConcMarkSweepGC) {

       jio_fprintf(defaultStream::error_stream(),

                   "error:  invalid argument combination.\n"

                   "Allocation profiling (-Xaprof) cannot be used together with "

                   "the CMS collector (-XX:+UseConcMarkSweepGC).\n");

       status = false;

     }

   }

   if (CMSIncrementalMode) {

     if (!UseConcMarkSweepGC) {

       jio_fprintf(defaultStream::error_stream(),

                   "error:  invalid argument combination.\n"

                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "

                   "selected in order\nto use CMSIncrementalMode.\n");

       status = false;

     } else {

       status = status && verify_percentage(CMSIncrementalDutyCycle,

                                   "CMSIncrementalDutyCycle");

       status = status && verify_percentage(CMSIncrementalDutyCycleMin,

                                   "CMSIncrementalDutyCycleMin");

       status = status && verify_percentage(CMSIncrementalSafetyFactor,

                                   "CMSIncrementalSafetyFactor");

       status = status && verify_percentage(CMSIncrementalOffset,

                                   "CMSIncrementalOffset");

       status = status && verify_percentage(CMSExpAvgFactor,

                                   "CMSExpAvgFactor");

       // If it was not set on the command line, set

       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.

       if (CMSInitiatingOccupancyFraction < 0) {

         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);

       }

     }

   }

   // CMS space iteration, which FLSVerifyAllHeapreferences entails,

   // insists that we hold the requisite locks so that the iteration is

   // MT-safe. For the verification at start-up and shut-down, we don't

   // yet have a good way of acquiring and releasing these locks,

   // which are not visible at the CollectedHeap level. We want to

   // be able to acquire these locks and then do the iteration rather

   // than just disable the lock verification. This will be fixed under

   // bug 4788986.

   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {

     if (VerifyGCStartAt == 0) {

       warning("Heap verification at start-up disabled "

               "(due to current incompatibility with FLSVerifyAllHeapReferences)");

       VerifyGCStartAt = 1;      // Disable verification at start-up

     }

     if (VerifyBeforeExit) {

       warning("Heap verification at shutdown disabled "

               "(due to current incompatibility with FLSVerifyAllHeapReferences)");

       VerifyBeforeExit = false; // Disable verification at shutdown

     }

   }

   // Note: only executed in non-PRODUCT mode

   if (!UseAsyncConcMarkSweepGC &&

       (ExplicitGCInvokesConcurrent ||

        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {

     jio_fprintf(defaultStream::error_stream(),

                 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"

                 " with -UseAsyncConcMarkSweepGC");

     status = false;

   }

   if (UseG1GC) {

     status = status && verify_percentage(InitiatingHeapOccupancyPercent,

                                          "InitiatingHeapOccupancyPercent");

   }

   status = status && verify_interval(RefDiscoveryPolicy,

                                      ReferenceProcessor::DiscoveryPolicyMin,

                                      ReferenceProcessor::DiscoveryPolicyMax,

                                      "RefDiscoveryPolicy");

   // Limit the lower bound of this flag to 1 as it is used in a division

   // expression.

   status = status && verify_interval(TLABWasteTargetPercent,

                                      1, 100, "TLABWasteTargetPercent");

   status = status && verify_object_alignment();

   return status;

 }

 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,

   const char* option_type) {

   if (ignore) return false;

   const char* spacer = " ";

   if (option_type == NULL) {

     option_type = ++spacer; // Set both to the empty string.

   }

   if (os::obsolete_option(option)) {

     jio_fprintf(defaultStream::error_stream(),

                 "Obsolete %s%soption: %s\n", option_type, spacer,

       option->optionString);

     return false;

   } else {

     jio_fprintf(defaultStream::error_stream(),

                 "Unrecognized %s%soption: %s\n", option_type, spacer,

       option->optionString);

     return true;

   }

 }

 static const char* user_assertion_options[] = {

   "-da", "-ea", "-disableassertions", "-enableassertions", 0

 };

 static const char* system_assertion_options[] = {

   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0

 };

 // Return true if any of the strings in null-terminated array 'names' matches.

 // If tail_allowed is true, then the tail must begin with a colon; otherwise,

 // the option must match exactly.

 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,

   bool tail_allowed) {

   for (/* empty */; *names != NULL; ++names) {

     if (match_option(option, *names, tail)) {

       if (**tail == '\0' || tail_allowed && **tail == ':') {

         return true;

       }

     }

   }

   return false;

 }

 bool Arguments::parse_uintx(const char* value,

                             uintx* uintx_arg,

                             uintx min_size) {

   // Check the sign first since atomull() parses only unsigned values.

   bool value_is_positive = !(*value == '-');

   if (value_is_positive) {

     julong n;

     bool good_return = atomull(value, &n);

     if (good_return) {

       bool above_minimum = n >= min_size;

       bool value_is_too_large = n > max_uintx;

       if (above_minimum && !value_is_too_large) {

         *uintx_arg = n;

         return true;

       }

     }

   }

   return false;

 }

 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,

                                                   julong* long_arg,

                                                   julong min_size) {

   if (!atomull(s, long_arg)) return arg_unreadable;

   return check_memory_size(*long_arg, min_size);

 }

 // Parse JavaVMInitArgs structure

 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {

   // For components of the system classpath.

   SysClassPath scp(Arguments::get_sysclasspath());

   bool scp_assembly_required = false;

   // Save default settings for some mode flags

   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;

   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;

   Arguments::_ClipInlining             = ClipInlining;

   Arguments::_BackgroundCompilation    = BackgroundCompilation;

   // Parse JAVA_TOOL_OPTIONS environment variable (if present)

   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);

   if (result != JNI_OK) {

     return result;

   }

   // Parse JavaVMInitArgs structure passed in

   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);

   if (result != JNI_OK) {

     return result;

   }

   if (AggressiveOpts) {

     // Insert alt-rt.jar between user-specified bootclasspath

     // prefix and the default bootclasspath.  os::set_boot_path()

     // uses meta_index_dir as the default bootclasspath directory.

     const char* altclasses_jar = "alt-rt.jar";

     size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +

                                  strlen(altclasses_jar);

     char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);

     strcpy(altclasses_path, get_meta_index_dir());

     strcat(altclasses_path, altclasses_jar);

     scp.add_suffix_to_prefix(altclasses_path);

     scp_assembly_required = true;

     FREE_C_HEAP_ARRAY(char, altclasses_path);

   }

   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)

   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);

   if (result != JNI_OK) {

     return result;

   }

   // Do final processing now that all arguments have been parsed

   result = finalize_vm_init_args(&scp, scp_assembly_required);

   if (result != JNI_OK) {

     return result;

   }

   return JNI_OK;

 }

 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,

                                        SysClassPath* scp_p,

                                        bool* scp_assembly_required_p,

                                        FlagValueOrigin origin) {

   // Remaining part of option string

   const char* tail;

   // iterate over arguments

   for (int index = 0; index < args->nOptions; index++) {

     bool is_absolute_path = false;  // for -agentpath vs -agentlib

     const JavaVMOption* option = args->options + index;

     if (!match_option(option, "-Djava.class.path", &tail) &&

         !match_option(option, "-Dsun.java.command", &tail) &&

         !match_option(option, "-Dsun.java.launcher", &tail)) {

         // add all jvm options to the jvm_args string. This string

         // is used later to set the java.vm.args PerfData string constant.

         // the -Djava.class.path and the -Dsun.java.command options are

         // omitted from jvm_args string as each have their own PerfData

         // string constant object.

         build_jvm_args(option->optionString);

     }

     // -verbose:[class/gc/jni]

     if (match_option(option, "-verbose", &tail)) {

       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {

         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);

         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);

       } else if (!strcmp(tail, ":gc")) {

         FLAG_SET_CMDLINE(bool, PrintGC, true);

       } else if (!strcmp(tail, ":jni")) {

         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);

       }

     // -da / -ea / -disableassertions / -enableassertions

     // These accept an optional class/package name separated by a colon, e.g.,

     // -da:java.lang.Thread.

     } else if (match_option(option, user_assertion_options, &tail, true)) {

       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'

       if (*tail == '\0') {

         JavaAssertions::setUserClassDefault(enable);

       } else {

         assert(*tail == ':', "bogus match by match_option()");

         JavaAssertions::addOption(tail + 1, enable);

       }

     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions

     } else if (match_option(option, system_assertion_options, &tail, false)) {

       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'

       JavaAssertions::setSystemClassDefault(enable);

     // -bootclasspath:

     } else if (match_option(option, "-Xbootclasspath:", &tail)) {

       scp_p->reset_path(tail);

       *scp_assembly_required_p = true;

     // -bootclasspath/a:

     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {

       scp_p->add_suffix(tail);

       *scp_assembly_required_p = true;

     // -bootclasspath/p:

     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {

       scp_p->add_prefix(tail);

       *scp_assembly_required_p = true;

     // -Xrun

     } else if (match_option(option, "-Xrun", &tail)) {

       if (tail != NULL) {

         const char* pos = strchr(tail, ':');

         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;

         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);

         name[len] = '\0';

         char *options = NULL;

         if(pos != NULL) {

           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.

           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);

         }

 #ifdef JVMTI_KERNEL

         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {

           warning("profiling and debugging agents are not supported with Kernel VM");

         } else

 #endif // JVMTI_KERNEL

         add_init_library(name, options);

       }

     // -agentlib and -agentpath

     } else if (match_option(option, "-agentlib:", &tail) ||

           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {

       if(tail != NULL) {

         const char* pos = strchr(tail, '=');

         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;

         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);

         name[len] = '\0';

         char *options = NULL;

         if(pos != NULL) {

           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);

         }

 #ifdef JVMTI_KERNEL

         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {

           warning("profiling and debugging agents are not supported with Kernel VM");

         } else

 #endif // JVMTI_KERNEL

         add_init_agent(name, options, is_absolute_path);

       }

     // -javaagent

     } else if (match_option(option, "-javaagent:", &tail)) {

       if(tail != NULL) {

         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);

         add_init_agent("instrument", options, false);

       }

     // -Xnoclassgc

     } else if (match_option(option, "-Xnoclassgc", &tail)) {

       FLAG_SET_CMDLINE(bool, ClassUnloading, false);

     // -Xincgc: i-CMS

     } else if (match_option(option, "-Xincgc", &tail)) {

       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);

       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);

     // -Xnoincgc: no i-CMS

     } else if (match_option(option, "-Xnoincgc", &tail)) {

       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);

       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);

     // -Xconcgc

     } else if (match_option(option, "-Xconcgc", &tail)) {

       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);

     // -Xnoconcgc

     } else if (match_option(option, "-Xnoconcgc", &tail)) {

       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);

     // -Xbatch

     } else if (match_option(option, "-Xbatch", &tail)) {

       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);

     // -Xmn for compatibility with other JVM vendors

     } else if (match_option(option, "-Xmn", &tail)) {

       julong long_initial_eden_size = 0;

       ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);

       if (errcode != arg_in_range) {

         jio_fprintf(defaultStream::error_stream(),

                     "Invalid initial eden size: %s\n", option->optionString);

         describe_range_error(errcode);

         return JNI_EINVAL;

       }

       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);

       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);

     // -Xms

     } else if (match_option(option, "-Xms", &tail)) {

       julong long_initial_heap_size = 0;

       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);

       if (errcode != arg_in_range) {

         jio_fprintf(defaultStream::error_stream(),

                     "Invalid initial heap size: %s\n", option->optionString);

         describe_range_error(errcode);

         return JNI_EINVAL;

       }

       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);

       // Currently the minimum size and the initial heap sizes are the same.

       set_min_heap_size(InitialHeapSize);

     // -Xmx

     } else if (match_option(option, "-Xmx", &tail)) {

       julong long_max_heap_size = 0;

       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);

       if (errcode != arg_in_range) {

         jio_fprintf(defaultStream::error_stream(),

                     "Invalid maximum heap size: %s\n", option->optionString);

         describe_range_error(errcode);

         return JNI_EINVAL;

       }

       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);

     // Xmaxf

     } else if (match_option(option, "-Xmaxf", &tail)) {

       int maxf = (int)(atof(tail) * 100);

       if (maxf < 0 || maxf > 100) {

         jio_fprintf(defaultStream::error_stream(),

                     "Bad max heap free percentage size: %s\n",

                     option->optionString);

         return JNI_EINVAL;

       } else {

         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);

       }

     // Xminf

     } else if (match_option(option, "-Xminf", &tail)) {

       int minf = (int)(atof(tail) * 100);

       if (minf < 0 || minf > 100) {

         jio_fprintf(defaultStream::error_stream(),

                     "Bad min heap free percentage size: %s\n",

                     option->optionString);

         return JNI_EINVAL;

       } else {

         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);

       }

     // -Xss

     } else if (match_option(option, "-Xss", &tail)) {

       julong long_ThreadStackSize = 0;

       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);

       if (errcode != arg_in_range) {

         jio_fprintf(defaultStream::error_stream(),

                     "Invalid thread stack size: %s\n", option->optionString);

         describe_range_error(errcode);

         return JNI_EINVAL;

       }

       // Internally track ThreadStackSize in units of 1024 bytes.

       FLAG_SET_CMDLINE(intx, ThreadStackSize,

                               round_to((int)long_ThreadStackSize, K) / K);

     // -Xoss

     } else if (match_option(option, "-Xoss", &tail)) {

           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility

     // -Xmaxjitcodesize

     } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {

       julong long_ReservedCodeCacheSize = 0;

       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,

                                             (size_t)InitialCodeCacheSize);

       if (errcode != arg_in_range) {

         jio_fprintf(defaultStream::error_stream(),

                     "Invalid maximum code cache size: %s\n",

                     option->optionString);

         describe_range_error(errcode);

         return JNI_EINVAL;

       }

       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);

     // -green

     } else if (match_option(option, "-green", &tail)) {

       jio_fprintf(defaultStream::error_stream(),

                   "Green threads support not available\n");

           return JNI_EINVAL;

     // -native

     } else if (match_option(option, "-native", &tail)) {

           // HotSpot always uses native threads, ignore silently for compatibility

     // -Xsqnopause

     } else if (match_option(option, "-Xsqnopause", &tail)) {

           // EVM option, ignore silently for compatibility

     // -Xrs

     } else if (match_option(option, "-Xrs", &tail)) {

           // Classic/EVM option, new functionality

       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);

     } else if (match_option(option, "-Xusealtsigs", &tail)) {

           // change default internal VM signals used - lower case for back compat

       FLAG_SET_CMDLINE(bool, UseAltSigs, true);

     // -Xoptimize

     } else if (match_option(option, "-Xoptimize", &tail)) {

           // EVM option, ignore silently for compatibility

     // -Xprof

     } else if (match_option(option, "-Xprof", &tail)) {

 #ifndef FPROF_KERNEL

       _has_profile = true;

 #else // FPROF_KERNEL

       // do we have to exit?

       warning("Kernel VM does not support flat profiling.");

 #endif // FPROF_KERNEL

     // -Xaprof

     } else if (match_option(option, "-Xaprof", &tail)) {

       _has_alloc_profile = true;

     // -Xconcurrentio

     } else if (match_option(option, "-Xconcurrentio", &tail)) {

       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);

       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);

       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);

       FLAG_SET_CMDLINE(bool, UseTLAB, false);

       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation

       // -Xinternalversion

     } else if (match_option(option, "-Xinternalversion", &tail)) {

       jio_fprintf(defaultStream::output_stream(), "%s\n",

                   VM_Version::internal_vm_info_string());

       vm_exit(0);

 #ifndef PRODUCT

     // -Xprintflags

     } else if (match_option(option, "-Xprintflags", &tail)) {

       CommandLineFlags::printFlags();

       vm_exit(0);

 #endif

     // -D

     } else if (match_option(option, "-D", &tail)) {

       if (!add_property(tail)) {

         return JNI_ENOMEM;

       }

       // Out of the box management support

       if (match_option(option, "-Dcom.sun.management", &tail)) {

         FLAG_SET_CMDLINE(bool, ManagementServer, true);

       }

     // -Xint

     } else if (match_option(option, "-Xint", &tail)) {

           set_mode_flags(_int);

     // -Xmixed

     } else if (match_option(option, "-Xmixed", &tail)) {

           set_mode_flags(_mixed);

     // -Xcomp

     } else if (match_option(option, "-Xcomp", &tail)) {

       // for testing the compiler; turn off all flags that inhibit compilation

           set_mode_flags(_comp);

     // -Xshare:dump

     } else if (match_option(option, "-Xshare:dump", &tail)) {

 #ifdef TIERED

       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);

       set_mode_flags(_int);     // Prevent compilation, which creates objects

 #elif defined(COMPILER2)

       vm_exit_during_initialization(

           "Dumping a shared archive is not supported on the Server JVM.", NULL);

 #elif defined(KERNEL)

       vm_exit_during_initialization(

           "Dumping a shared archive is not supported on the Kernel JVM.", NULL);

 #else

       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);

       set_mode_flags(_int);     // Prevent compilation, which creates objects

 #endif

     // -Xshare:on

     } else if (match_option(option, "-Xshare:on", &tail)) {

       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);

       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);

 #ifdef TIERED

       FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);

 #endif // TIERED

     // -Xshare:auto

     } else if (match_option(option, "-Xshare:auto", &tail)) {

       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);

       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);

     // -Xshare:off

     } else if (match_option(option, "-Xshare:off", &tail)) {

       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);

       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);

     // -Xverify

     } else if (match_option(option, "-Xverify", &tail)) {

       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {

         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);

         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);

       } else if (strcmp(tail, ":remote") == 0) {

         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);

         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);

       } else if (strcmp(tail, ":none") == 0) {

         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);

         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);

       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {

         return JNI_EINVAL;

       }

     // -Xdebug

     } else if (match_option(option, "-Xdebug", &tail)) {

       // note this flag has been used, then ignore

       set_xdebug_mode(true);

     // -Xnoagent

     } else if (match_option(option, "-Xnoagent", &tail)) {

       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.

     } else if (match_option(option, "-Xboundthreads", &tail)) {

       // Bind user level threads to kernel threads (Solaris only)

       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);

     } else if (match_option(option, "-Xloggc:", &tail)) {

       // Redirect GC output to the file. -Xloggc:<filename>

       // ostream_init_log(), when called will use this filename

       // to initialize a fileStream.

       _gc_log_filename = strdup(tail);

       FLAG_SET_CMDLINE(bool, PrintGC, true);

       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);

       FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);

     // JNI hooks

     } else if (match_option(option, "-Xcheck", &tail)) {

       if (!strcmp(tail, ":jni")) {

         CheckJNICalls = true;

       } else if (is_bad_option(option, args->ignoreUnrecognized,

                                      "check")) {

         return JNI_EINVAL;

       }

     } else if (match_option(option, "vfprintf", &tail)) {

       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);

     } else if (match_option(option, "exit", &tail)) {

       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);

     } else if (match_option(option, "abort", &tail)) {

       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);

     // -XX:+AggressiveHeap

     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {

       // This option inspects the machine and attempts to set various

       // parameters to be optimal for long-running, memory allocation

       // intensive jobs.  It is intended for machines with large

       // amounts of cpu and memory.

       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit

       // VM, but we may not be able to represent the total physical memory

       // available (like having 8gb of memory on a box but using a 32bit VM).

       // Thus, we need to make sure we're using a julong for intermediate

       // calculations.

       julong initHeapSize;

       julong total_memory = os::physical_memory();

       if (total_memory < (julong)256*M) {

         jio_fprintf(defaultStream::error_stream(),

                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");

         vm_exit(1);

       }

       // The heap size is half of available memory, or (at most)

       // all of possible memory less 160mb (leaving room for the OS

       // when using ISM).  This is the maximum; because adaptive sizing

       // is turned on below, the actual space used may be smaller.

       initHeapSize = MIN2(total_memory / (julong)2,

                           total_memory - (julong)160*M);

       // Make sure that if we have a lot of memory we cap the 32 bit

       // process space.  The 64bit VM version of this function is a nop.

       initHeapSize = os::allocatable_physical_memory(initHeapSize);

       // The perm gen is separate but contiguous with the

       // object heap (and is reserved with it) so subtract it

       // from the heap size.

       if (initHeapSize > MaxPermSize) {

         initHeapSize = initHeapSize - MaxPermSize;

       } else {

         warning("AggressiveHeap and MaxPermSize values may conflict");

       }

       if (FLAG_IS_DEFAULT(MaxHeapSize)) {

          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);

          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);

          // Currently the minimum size and the initial heap sizes are the same.

          set_min_heap_size(initHeapSize);

       }

       if (FLAG_IS_DEFAULT(NewSize)) {

          // Make the young generation 3/8ths of the total heap.

          FLAG_SET_CMDLINE(uintx, NewSize,

                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);

          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);

       }

       FLAG_SET_DEFAULT(UseLargePages, true);

       // Increase some data structure sizes for efficiency

       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);

       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);

       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);

       // See the OldPLABSize comment below, but replace 'after promotion'

       // with 'after copying'.  YoungPLABSize is the size of the survivor

       // space per-gc-thread buffers.  The default is 4kw.

       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words

       // OldPLABSize is the size of the buffers in the old gen that

       // UseParallelGC uses to promote live data that doesn't fit in the

       // survivor spaces.  At any given time, there's one for each gc thread.

       // The default size is 1kw. These buffers are rarely used, since the

       // survivor spaces are usually big enough.  For specjbb, however, there

       // are occasions when there's lots of live data in the young gen

       // and we end up promoting some of it.  We don't have a definite

       // explanation for why bumping OldPLABSize helps, but the theory

       // is that a bigger PLAB results in retaining something like the

       // original allocation order after promotion, which improves mutator

       // locality.  A minor effect may be that larger PLABs reduce the

       // number of PLAB allocation events during gc.  The value of 8kw

       // was arrived at by experimenting with specjbb.

       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words

       // CompilationPolicyChoice=0 causes the server compiler to adopt

       // a more conservative which-method-do-I-compile policy when one

       // of the counters maintained by the interpreter trips.  The

       // result is reduced startup time and improved specjbb and

       // alacrity performance.  Zero is the default, but we set it

       // explicitly here in case the default changes.

       // See runtime/compilationPolicy.*.

       FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);

       // Enable parallel GC and adaptive generation sizing

       FLAG_SET_CMDLINE(bool, UseParallelGC, true);

       FLAG_SET_DEFAULT(ParallelGCThreads,

                        Abstract_VM_Version::parallel_worker_threads());

       // Encourage steady state memory management

       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);

       // This appears to improve mutator locality

       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);

       // Get around early Solaris scheduling bug

       // (affinity vs other jobs on system)

       // but disallow DR and offlining (5008695).

       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);

     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {

       // The last option must always win.

       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);

       FLAG_SET_CMDLINE(bool, NeverTenure, true);

     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {

       // The last option must always win.

       FLAG_SET_CMDLINE(bool, NeverTenure, false);

       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);

     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||

                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {

       jio_fprintf(defaultStream::error_stream(),

         "Please use CMSClassUnloadingEnabled in place of "

         "CMSPermGenSweepingEnabled in the future\n");

     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {

       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);

       jio_fprintf(defaultStream::error_stream(),

         "Please use -XX:+UseGCOverheadLimit in place of "

         "-XX:+UseGCTimeLimit in the future\n");

     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {

       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);

       jio_fprintf(defaultStream::error_stream(),

         "Please use -XX:-UseGCOverheadLimit in place of "

         "-XX:-UseGCTimeLimit in the future\n");

     // The TLE options are for compatibility with 1.3 and will be

     // removed without notice in a future release.  These options

     // are not to be documented.

     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {

       // No longer used.

     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {

       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);

     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {

       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);

     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {

       FLAG_SET_CMDLINE(bool, PrintTLAB, true);

     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {

       FLAG_SET_CMDLINE(bool, PrintTLAB, false);

     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {

       // No longer used.

     } else if (match_option(option, "-XX:TLESize=", &tail)) {

       julong long_tlab_size = 0;

       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);

       if (errcode != arg_in_range) {

         jio_fprintf(defaultStream::error_stream(),

                     "Invalid TLAB size: %s\n", option->optionString);

         describe_range_error(errcode);

         return JNI_EINVAL;

       }

       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);

     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {

       // No longer used.

     } else if (match_option(option, "-XX:+UseTLE", &tail)) {

       FLAG_SET_CMDLINE(bool, UseTLAB, true);

     } else if (match_option(option, "-XX:-UseTLE", &tail)) {

       FLAG_SET_CMDLINE(bool, UseTLAB, false);

 SOLARIS_ONLY(

     } else if (match_option(option, "-XX:+UsePermISM", &tail)) {

       warning("-XX:+UsePermISM is obsolete.");

       FLAG_SET_CMDLINE(bool, UseISM, true);

     } else if (match_option(option, "-XX:-UsePermISM", &tail)) {