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

 /*

  * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 #include "incls/_precompiled.incl"

 #include "incls/_arguments.cpp.incl"

 #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::_initial_heap_size            = 0;

 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;

 intx   Arguments::_Tier2CompileThreshold        = Tier2CompileThreshold;

 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.version", "1.0", false));

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

                                                                  "Java Virtual Machine Specification",  false));

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

                                                                  "Sun Microsystems Inc.",  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.vendor", VM_Version::vm_vendor(),  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();

 }

 // String containing commands that will be ignored and cause a

 // warning to be issued.  These commands should be accepted

 // for 1.6 but not 1.7.  The string should be cleared at the

 // beginning of 1.7.

 static const char*  obsolete_jvm_flags_1_5_0[] = {

                                            "UseTrainGC",

                                            "UseSpecialLargeObjectHandling",

                                            "UseOversizedCarHandling",

                                            "TraceCarAllocation",

                                            "PrintTrainGCProcessingStats",

                                            "LogOfCarSpaceSize",

                                            "OversizedCarThreshold",

                                            "MinTickInterval",

                                            "DefaultTickInterval",

                                            "MaxTickInterval",

                                            "DelayTickAdjustment",

                                            "ProcessingToTenuringRatio",

                                            "MinTrainLength",

                                            0};

 bool Arguments::made_obsolete_in_1_5_0(const char *s) {

   int i = 0;

   while (obsolete_jvm_flags_1_5_0[i] != NULL) {

     // <flag>=xxx form

     // [-|+]<flag> form

     if ((strncmp(obsolete_jvm_flags_1_5_0[i], s,

                strlen(obsolete_jvm_flags_1_5_0[i])) == 0) ||

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

         (strncmp(obsolete_jvm_flags_1_5_0[i], &s[1],

                strlen(obsolete_jvm_flags_1_5_0[i])) == 0))) {

       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(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(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 atomll(const char *s, jlong* result) {

   jlong n = 0;

   int args_read = sscanf(s, os::jlong_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;

       return true;

     case 'G': case 'g':

       *result = n * G;

       return true;

     case 'M': case 'm':

       *result = n * M;

       return true;

     case 'K': case 'k':

       *result = n * K;

       return true;

     case '\0':

       *result = n;

       return true;

     default:

       return false;

   }

 }

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

   jlong v;

   intx intx_v;

   bool is_neg = false;

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

   if (*value == '-') {

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

       return false;

     }

     value++;

     is_neg = true;

   }

   if (!atomll(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;

   }

   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) {

   if (parse_argument(arg, origin)) {

     // do nothing

   } else if (made_obsolete_in_1_5_0(arg)) {

     jio_fprintf(defaultStream::error_stream(),

       "Warning: The flag %s has been EOL'd as of 1.5.0 and will"

       " be ignored\n", arg);

   } 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;

   }

   // 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());

   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;

   Tier2CompileThreshold      = Arguments::_Tier2CompileThreshold;

   // 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);

   }

 }

 // 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 && !UseParallelGC, "control point invariant");

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

   // complete.

   if (UseParNewGC &&

       FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {

     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);

   }

   if (FLAG_IS_DEFAULT(UseParNewGC) && ParallelGCThreads > 1) {

     FLAG_SET_DEFAULT(UseParNewGC, true);

   } else if (UseParNewGC && ParallelGCThreads == 0) {

     FLAG_SET_DEFAULT(ParallelGCThreads,

                      Abstract_VM_Version::parallel_worker_threads());

     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {

       FLAG_SET_DEFAULT(UseParNewGC, false);

     }

   }

   if (!UseParNewGC) {

     FLAG_SET_DEFAULT(ParallelGCThreads, 0);

   } else {

     no_shared_spaces();

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

     // 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 to promote all at first collection.

     // See CR 6362902.

     if (AlwaysTenure) {

       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);

     }

   }

 }

 // 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() {

   if (UseSerialGC || UseParallelGC) {

     return;

   }

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

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

   // unless explicitly forbidden.

   if (!UseParNewGC && 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 (FLAG_IS_DEFAULT(MaxNewSize)) {  // MaxNewSize not set at command-line

     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 (FLAG_IS_DEFAULT(NewRatio)) {

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

     size_t min_new  = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size());

     size_t prev_initial_size = initial_heap_size();

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

       set_initial_heap_size(min_new+OldSize);

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

       set_min_heap_size(initial_heap_size());

       if (PrintGCDetails && Verbose) {

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

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

                 initial_heap_size()/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(), initial_heap_size(), 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");

     }

   }

 }

 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 ergonmics 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 &&

         !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();

     }

   }

 }

 void Arguments::set_parallel_gc_flags() {

   // 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 (FLAG_IS_DEFAULT(MaxHeapSize)) {

       const uint64_t reasonable_fraction =

         os::physical_memory() / DefaultMaxRAMFraction;

       const uint64_t maximum_size = (uint64_t) DefaultMaxRAM;

       size_t reasonable_max =

         (size_t) os::allocatable_physical_memory(reasonable_fraction);

       if (reasonable_max > maximum_size) {

         reasonable_max = maximum_size;

       }

       if (PrintGCDetails && Verbose) {

         // Cannot use gclog_or_tty yet.

         tty->print_cr("  Max heap size for server class platform "

                       SIZE_FORMAT, reasonable_max);

       }

       // If the initial_heap_size has not been set with -Xms,

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

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

       if (initial_heap_size() == 0) {

         const uint64_t reasonable_initial_fraction =

           os::physical_memory() / DefaultInitialRAMFraction;

         const size_t reasonable_initial =

           (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);

         const size_t minimum_size = NewSize + OldSize;

         set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),

                                   minimum_size));

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

         set_min_heap_size(initial_heap_size());

         if (PrintGCDetails && Verbose) {

           // Cannot use gclog_or_tty yet.

           tty->print_cr("  Initial heap size for server class platform "

                         SIZE_FORMAT, initial_heap_size());

         }

       } else {

         // An minimum size was specified on the command line.  Be sure

         // that the maximum size is consistent.

         if (initial_heap_size() > reasonable_max) {

           reasonable_max = initial_heap_size();

         }

       }

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

     }

     // 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);

       }

     }

   }

 }

 // 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=%d", AutoBoxCacheMax);

     add_property(buffer);

   }

 #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_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 set_serial_gc_flags() {

   FLAG_SET_DEFAULT(UseSerialGC, true);

   FLAG_SET_DEFAULT(UseParNewGC, false);

   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);

   FLAG_SET_DEFAULT(UseParallelGC, false);

   FLAG_SET_DEFAULT(UseParallelOldGC, false);

 }

 static bool verify_serial_gc_flags() {

   return (UseSerialGC &&

         !(UseParNewGC || UseConcMarkSweepGC || 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 (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 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(MaxLiveObjectEvacuationRatio,

                               "MaxLiveObjectEvacuationRatio");

   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.

   }

   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 user specified sharing option conflict with Parallel GC

   bool cannot_share = (UseConcMarkSweepGC || UseParallelGC ||

                        UseParallelOldGC || UseParNewGC ||

                        SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));

   if (cannot_share) {

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

     // force sharing off.

     if (DumpSharedSpaces || ForceSharedSpaces) {

       set_serial_gc_flags();

       FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);

     } else {

       no_shared_spaces();

     }

   }

   status = status && check_gc_consistency();

   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 if (!UseTLAB) {

       jio_fprintf(defaultStream::error_stream(),

                   "error:  CMSIncrementalMode requires thread-local "

                   "allocation buffers\n(-XX:+UseTLAB).\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);

       }

     }

   }

   if (UseNUMA && !UseTLAB) {

     jio_fprintf(defaultStream::error_stream(),

                 "error:  NUMA allocator (-XX:+UseNUMA) requires thread-local "

                 "allocation\nbuffers (-XX:+UseTLAB).\n");

     status = false;

   }

   // 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;

   }

   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;

 }

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

                                                   jlong* long_arg,

                                                   jlong min_size) {

   if (!atomll(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;

   Arguments::_Tier2CompileThreshold    = Tier2CompileThreshold;

   // 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;

   }

   // 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);

         FLAG_SET_CMDLINE(bool, TraceClassUnloading, 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)) {

       jlong 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, (size_t) long_initial_eden_size);

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

     // -Xms

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

       jlong 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;

       }

       set_initial_heap_size((size_t) long_initial_heap_size);

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

       set_min_heap_size(initial_heap_size());

     // -Xmx

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

       jlong 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, (size_t) 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)) {

       jlong 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)) {

       jlong long_ReservedCodeCacheSize = 0;

       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,

                                             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);

          set_initial_heap_size(MaxHeapSize);

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

          set_min_heap_size(initial_heap_size());

       }

       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)) {

       jlong 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)) {

       FLAG_SET_CMDLINE(bool, UseISM, false);

 )

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

       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);

       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);

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

       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);

       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);

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

 #ifdef SOLARIS

       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);

       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);

       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);

       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);

 #else // ndef SOLARIS

       jio_fprintf(defaultStream::error_stream(),

                   "ExtendedDTraceProbes flag is only applicable on Solaris\n");

       return JNI_EINVAL;

 #endif // ndef SOLARIS

     } else

 #ifdef ASSERT

     if (match_option(option, "-XX:+FullGCALot", &tail)) {

       FLAG_SET_CMDLINE(bool, FullGCALot, true);

       // disable scavenge before parallel mark-compact

       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);

     } else

 #endif

     if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {

       julong cms_blocks_to_claim = (julong)atol(tail);

       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);

       jio_fprintf(defaultStream::error_stream(),

         "Please use -XX:CMSParPromoteBlocksToClaim in place of "

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

     } else

     if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {

       jlong old_plab_size = 0;

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

       if (errcode != arg_in_range) {

         jio_fprintf(defaultStream::error_stream(),

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

         describe_range_error(errcode);

         return JNI_EINVAL;

       }

       FLAG_SET_CMDLINE(uintx, OldPLABSize, (julong)old_plab_size);

       jio_fprintf(defaultStream::error_stream(),

                   "Please use -XX:OldPLABSize in place of "

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

     } else

     if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {

       jlong young_plab_size = 0;

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

       if (errcode != arg_in_range) {

         jio_fprintf(defaultStream::error_stream(),

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

         describe_range_error(errcode);

         return JNI_EINVAL;

       }

       FLAG_SET_CMDLINE(uintx, YoungPLABSize, (julong)young_plab_size);

       jio_fprintf(defaultStream::error_stream(),

                   "Please use -XX:YoungPLABSize in place of "

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

     } else

     if (match_option(option, "-XX:", &tail)) { // -XX:xxxx

       // Skip -XX:Flags= since that case has already been handled

       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {

         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {

           return JNI_EINVAL;

         }

       }

     // Unknown option

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

       return JNI_ERR;

     }

   }

   return JNI_OK;

 }

 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {

   // This must be done after all -D arguments have been processed.

   scp_p->expand_endorsed();

   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {

     // Assemble the bootclasspath elements into the final path.

     Arguments::set_sysclasspath(scp_p->combined_path());

   }

   // This must be done after all arguments have been processed.

   // java_compiler() true means set to "NONE" or empty.

   if (java_compiler() && !xdebug_mode()) {

     // For backwards compatibility, we switch to interpreted mode if

     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was

     // not specified.

     set_mode_flags(_int);

   }

   if (CompileThreshold == 0) {

     set_mode_flags(_int);

   }

 #ifdef TIERED

   // If we are using tiered compilation in the tiered vm then c1 will

   // do the profiling and we don't want to waste that time in the

   // interpreter.

   if (TieredCompilation) {

     ProfileInterpreter = false;

   } else {

     // Since we are running vanilla server we must adjust the compile threshold

     // unless the user has already adjusted it because the default threshold assumes

     // we will run tiered.

     if (FLAG_IS_DEFAULT(CompileThreshold)) {

       CompileThreshold = Tier2CompileThreshold;

     }

   }

 #endif // TIERED

 #ifndef COMPILER2

   // Don't degrade server performance for footprint

   if (FLAG_IS_DEFAULT(UseLargePages) &&

       MaxHeapSize < LargePageHeapSizeThreshold) {

     // No need for large granularity pages w/small heaps.

     // Note that large pages are enabled/disabled for both the

     // Java heap and the code cache.

     FLAG_SET_DEFAULT(UseLargePages, false);

     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));

     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));

   }

 #else

   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {

     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);

   }

 #endif

   if (!check_vm_args_consistency()) {

     return JNI_ERR;

   }

   return JNI_OK;

 }

 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {

   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,

                                             scp_assembly_required_p);

 }

 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {

   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,

                                             scp_assembly_required_p);

 }

 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {

   const int N_MAX_OPTIONS = 64;

   const int OPTION_BUFFER_SIZE = 1024;

   char buffer[OPTION_BUFFER_SIZE];

   // The variable will be ignored if it exceeds the length of the buffer.

   // Don't check this variable if user has special privileges

   // (e.g. unix su command).

   if (os::getenv(name, buffer, sizeof(buffer)) &&

       !os::have_special_privileges()) {

     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array

     jio_fprintf(defaultStream::error_stream(),

                 "Picked up %s: %s\n", name, buffer);

     char* rd = buffer;                        // pointer to the input string (rd)

     int i;

     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string

       while (isspace(*rd)) rd++;              // skip whitespace

       if (*rd == 0) break;                    // we re done when the input string is read completely

       // The output, option string, overwrites the input string.

       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to

       // input string (rd).

       char* wrt = rd;

       options[i++].optionString = wrt;        // Fill in option

       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL

         if (*rd == '\'' || *rd == '"') {      // handle a quoted string

           int quote = *rd;                    // matching quote to look for

           rd++;                               // don't copy open quote

           while (*rd != quote) {              // include everything (even spaces) up until quote

             if (*rd == 0) {                   // string termination means unmatched string

               jio_fprintf(defaultStream::error_stream(),

                           "Unmatched quote in %s\n", name);

               return JNI_ERR;

             }

             *wrt++ = *rd++;                   // copy to option string

           }

           rd++;                               // don't copy close quote

         } else {

           *wrt++ = *rd++;                     // copy to option string

         }

       }

       // Need to check if we're done before writing a NULL,

       // because the write could be to the byte that rd is pointing to.

       if (*rd++ == 0) {

         *wrt = 0;

         break;

       }

       *wrt = 0;                               // Zero terminate option

     }

     // Construct JavaVMInitArgs structure and parse as if it was part of the command line

     JavaVMInitArgs vm_args;

     vm_args.version = JNI_VERSION_1_2;

     vm_args.options = options;

     vm_args.nOptions = i;

     vm_args.ignoreUnrecognized = false;

     if (PrintVMOptions) {

       const char* tail;

       for (int i = 0; i < vm_args.nOptions; i++) {

         const JavaVMOption *option = vm_args.options + i;

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

           logOption(tail);

         }

       }

     }

     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));

   }

   return JNI_OK;

 }

 // Parse entry point called from JNI_CreateJavaVM

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

   // Sharing support

   // Construct the path to the archive

   char jvm_path[JVM_MAXPATHLEN];

   os::jvm_path(jvm_path, sizeof(jvm_path));

 #ifdef TIERED

   if (strstr(jvm_path, "client") != NULL) {

     force_client_mode = true;

   }

 #endif // TIERED

   char *end = strrchr(jvm_path, *os::file_separator());

   if (end != NULL) *end = '\0';

   char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +

                                         strlen(os::file_separator()) + 20);

   if (shared_archive_path == NULL) return JNI_ENOMEM;

   strcpy(shared_archive_path, jvm_path);

   strcat(shared_archive_path, os::file_separator());

   strcat(shared_archive_path, "classes");

   DEBUG_ONLY(strcat(shared_archive_path, "_g");)

   strcat(shared_archive_path, ".jsa");

   SharedArchivePath = shared_archive_path;

   // Remaining part of option string

   const char* tail;

   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.

   bool settings_file_specified = false;

   int index;

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

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

     if (match_option(option, "-XX:Flags=", &tail)) {

       if (!process_settings_file(tail, true, args->ignoreUnrecognized)) {

         return JNI_EINVAL;

       }

       settings_file_specified = true;

     }

     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {

       PrintVMOptions = true;

     }

   }

   // Parse default .hotspotrc settings file

   if (!settings_file_specified) {

     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {

       return JNI_EINVAL;

     }

   }

   if (PrintVMOptions) {

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

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

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

         logOption(tail);

       }

     }

   }

   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS

   jint result = parse_vm_init_args(args);

   if (result != JNI_OK) {

     return result;

   }

 #ifndef PRODUCT

   if (TraceBytecodesAt != 0) {

     TraceBytecodes = true;

   }

   if (CountCompiledCalls) {

     if (UseCounterDecay) {

       warning("UseCounterDecay disabled because CountCalls is set");

       UseCounterDecay = false;

     }

   }

 #endif // PRODUCT

   if (PrintGCDetails) {

     // Turn on -verbose:gc options as well

     PrintGC = true;

     if (FLAG_IS_DEFAULT(TraceClassUnloading)) {

       TraceClassUnloading = true;

     }

   }

 #ifdef SERIALGC

   set_serial_gc_flags();

 #endif // SERIALGC

 #ifdef KERNEL

   no_shared_spaces();

 #endif // KERNEL

   // Set flags based on ergonomics.

   set_ergonomics_flags();

   // Check the GC selections again.

   if (!check_gc_consistency()) {

     return JNI_EINVAL;

   }

   if (UseParallelGC || UseParallelOldGC) {

     // Set some flags for ParallelGC if needed.

     set_parallel_gc_flags();

   } else if (UseConcMarkSweepGC) {

     // Set some flags for CMS

     set_cms_and_parnew_gc_flags();

   } else if (UseParNewGC) {

     // Set some flags for ParNew

     set_parnew_gc_flags();

   }

 #ifdef SERIALGC

   assert(verify_serial_gc_flags(), "SerialGC unset");

 #endif // SERIALGC

   // Set bytecode rewriting flags

   set_bytecode_flags();

   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.

   set_aggressive_opts_flags();

 #ifdef CC_INTERP

   // Biased locking is not implemented with c++ interpreter

   FLAG_SET_DEFAULT(UseBiasedLocking, false);

 #endif /* CC_INTERP */

   if (PrintCommandLineFlags) {

     CommandLineFlags::printSetFlags();

   }

 #ifdef ASSERT

   if (PrintFlagsFinal) {

     CommandLineFlags::printFlags();

   }

 #endif

   return JNI_OK;

 }

 int Arguments::PropertyList_count(SystemProperty* pl) {

   int count = 0;

   while(pl != NULL) {

     count++;

     pl = pl->next();

   }

   return count;

 }

 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {

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

   SystemProperty* prop;

   for (prop = pl; prop != NULL; prop = prop->next()) {

     if (strcmp(key, prop->key()) == 0) return prop->value();

   }

   return NULL;

 }

 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {

   int count = 0;

   const char* ret_val = NULL;

   while(pl != NULL) {

     if(count >= index) {

       ret_val = pl->key();

       break;

     }

     count++;

     pl = pl->next();

   }

   return ret_val;

 }

 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {

   int count = 0;

   char* ret_val = NULL;

   while(pl != NULL) {

     if(count >= index) {

       ret_val = pl->value();

       break;

     }

     count++;

     pl = pl->next();

   }

   return ret_val;

 }

 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {

   SystemProperty* p = *plist;

   if (p == NULL) {

     *plist = new_p;

   } else {

     while (p->next() != NULL) {

       p = p->next();

     }

     p->set_next(new_p);

   }

 }

 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {

   if (plist == NULL)

     return;

   SystemProperty* new_p = new SystemProperty(k, v, true);

   PropertyList_add(plist, new_p);

 }

 // This add maintains unique property key in the list.

 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) {

   if (plist == NULL)

     return;

   // If property key exist then update with new value.

   SystemProperty* prop;

   for (prop = *plist; prop != NULL; prop = prop->next()) {

     if (strcmp(k, prop->key()) == 0) {

       prop->set_value(v);

       return;

     }

   }

   PropertyList_add(plist, k, v);

 }

 #ifdef KERNEL

 char *Arguments::get_kernel_properties() {

   // Find properties starting with kernel and append them to string

   // We need to find out how long they are first because the URL's that they

   // might point to could get long.

   int length = 0;

   SystemProperty* prop;

   for (prop = _system_properties; prop != NULL; prop = prop->next()) {

     if (strncmp(prop->key(), "kernel.", 7 ) == 0) {

       length += (strlen(prop->key()) + strlen(prop->value()) + 5);  // "-D ="

     }

   }

   // Add one for null terminator.

   char *props = AllocateHeap(length + 1, "get_kernel_properties");

   if (length != 0) {

     int pos = 0;

     for (prop = _system_properties; prop != NULL; prop = prop->next()) {

       if (strncmp(prop->key(), "kernel.", 7 ) == 0) {

         jio_snprintf(&props[pos], length-pos,

                      "-D%s=%s ", prop->key(), prop->value());

         pos = strlen(props);

       }

     }

   }

   // null terminate props in case of null

   props[length] = '\0';