src/share/vm/runtime/arguments.cpp

Fri, 09 May 2008 08:55:13 -0700

author
dcubed
date
Fri, 09 May 2008 08:55:13 -0700
changeset 587
c70a245cad3a
parent 511
d6fe2e4959d6
child 548
ba764ed4b6f2
permissions
-rw-r--r--

6670684: 4/5 SA command universe did not print out CMS space information
Summary: Forward port of Yumin's fix for 6670684 from HSX-11; Yumin verified the port was correct.
Reviewed-by: dcubed

     1 /*
     2  * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     4  *
     5  * This code is free software; you can redistribute it and/or modify it
     6  * under the terms of the GNU General Public License version 2 only, as
     7  * published by the Free Software Foundation.
     8  *
     9  * This code is distributed in the hope that it will be useful, but WITHOUT
    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    12  * version 2 for more details (a copy is included in the LICENSE file that
    13  * accompanied this code).
    14  *
    15  * You should have received a copy of the GNU General Public License version
    16  * 2 along with this work; if not, write to the Free Software Foundation,
    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
    18  *
    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
    20  * CA 95054 USA or visit www.sun.com if you need additional information or
    21  * have any questions.
    22  *
    23  */
    25 #include "incls/_precompiled.incl"
    26 #include "incls/_arguments.cpp.incl"
    28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
    29 #define DEFAULT_JAVA_LAUNCHER  "generic"
    31 char**  Arguments::_jvm_flags_array             = NULL;
    32 int     Arguments::_num_jvm_flags               = 0;
    33 char**  Arguments::_jvm_args_array              = NULL;
    34 int     Arguments::_num_jvm_args                = 0;
    35 char*  Arguments::_java_command                 = NULL;
    36 SystemProperty* Arguments::_system_properties   = NULL;
    37 const char*  Arguments::_gc_log_filename        = NULL;
    38 bool   Arguments::_has_profile                  = false;
    39 bool   Arguments::_has_alloc_profile            = false;
    40 uintx  Arguments::_initial_heap_size            = 0;
    41 uintx  Arguments::_min_heap_size                = 0;
    42 Arguments::Mode Arguments::_mode                = _mixed;
    43 bool   Arguments::_java_compiler                = false;
    44 bool   Arguments::_xdebug_mode                  = false;
    45 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
    46 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
    47 int    Arguments::_sun_java_launcher_pid        = -1;
    49 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
    50 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
    51 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
    52 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
    53 bool   Arguments::_ClipInlining                 = ClipInlining;
    54 intx   Arguments::_Tier2CompileThreshold        = Tier2CompileThreshold;
    56 char*  Arguments::SharedArchivePath             = NULL;
    58 AgentLibraryList Arguments::_libraryList;
    59 AgentLibraryList Arguments::_agentList;
    61 abort_hook_t     Arguments::_abort_hook         = NULL;
    62 exit_hook_t      Arguments::_exit_hook          = NULL;
    63 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
    66 SystemProperty *Arguments::_java_ext_dirs = NULL;
    67 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
    68 SystemProperty *Arguments::_sun_boot_library_path = NULL;
    69 SystemProperty *Arguments::_java_library_path = NULL;
    70 SystemProperty *Arguments::_java_home = NULL;
    71 SystemProperty *Arguments::_java_class_path = NULL;
    72 SystemProperty *Arguments::_sun_boot_class_path = NULL;
    74 char* Arguments::_meta_index_path = NULL;
    75 char* Arguments::_meta_index_dir = NULL;
    77 static bool force_client_mode = false;
    79 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
    81 static bool match_option(const JavaVMOption *option, const char* name,
    82                          const char** tail) {
    83   int len = (int)strlen(name);
    84   if (strncmp(option->optionString, name, len) == 0) {
    85     *tail = option->optionString + len;
    86     return true;
    87   } else {
    88     return false;
    89   }
    90 }
    92 static void logOption(const char* opt) {
    93   if (PrintVMOptions) {
    94     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
    95   }
    96 }
    98 // Process java launcher properties.
    99 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
   100   // See if sun.java.launcher or sun.java.launcher.pid is defined.
   101   // Must do this before setting up other system properties,
   102   // as some of them may depend on launcher type.
   103   for (int index = 0; index < args->nOptions; index++) {
   104     const JavaVMOption* option = args->options + index;
   105     const char* tail;
   107     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
   108       process_java_launcher_argument(tail, option->extraInfo);
   109       continue;
   110     }
   111     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
   112       _sun_java_launcher_pid = atoi(tail);
   113       continue;
   114     }
   115   }
   116 }
   118 // Initialize system properties key and value.
   119 void Arguments::init_system_properties() {
   121   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false));
   122   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
   123                                                                  "Java Virtual Machine Specification",  false));
   124   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor",
   125                                                                  "Sun Microsystems Inc.",  false));
   126   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
   127   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
   128   PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
   129   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
   131   // following are JVMTI agent writeable properties.
   132   // Properties values are set to NULL and they are
   133   // os specific they are initialized in os::init_system_properties_values().
   134   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
   135   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
   136   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
   137   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
   138   _java_home =  new SystemProperty("java.home", NULL,  true);
   139   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
   141   _java_class_path = new SystemProperty("java.class.path", "",  true);
   143   // Add to System Property list.
   144   PropertyList_add(&_system_properties, _java_ext_dirs);
   145   PropertyList_add(&_system_properties, _java_endorsed_dirs);
   146   PropertyList_add(&_system_properties, _sun_boot_library_path);
   147   PropertyList_add(&_system_properties, _java_library_path);
   148   PropertyList_add(&_system_properties, _java_home);
   149   PropertyList_add(&_system_properties, _java_class_path);
   150   PropertyList_add(&_system_properties, _sun_boot_class_path);
   152   // Set OS specific system properties values
   153   os::init_system_properties_values();
   154 }
   156 // String containing commands that will be ignored and cause a
   157 // warning to be issued.  These commands should be accepted
   158 // for 1.6 but not 1.7.  The string should be cleared at the
   159 // beginning of 1.7.
   160 static const char*  obsolete_jvm_flags_1_5_0[] = {
   161                                            "UseTrainGC",
   162                                            "UseSpecialLargeObjectHandling",
   163                                            "UseOversizedCarHandling",
   164                                            "TraceCarAllocation",
   165                                            "PrintTrainGCProcessingStats",
   166                                            "LogOfCarSpaceSize",
   167                                            "OversizedCarThreshold",
   168                                            "MinTickInterval",
   169                                            "DefaultTickInterval",
   170                                            "MaxTickInterval",
   171                                            "DelayTickAdjustment",
   172                                            "ProcessingToTenuringRatio",
   173                                            "MinTrainLength",
   174                                            0};
   176 bool Arguments::made_obsolete_in_1_5_0(const char *s) {
   177   int i = 0;
   178   while (obsolete_jvm_flags_1_5_0[i] != NULL) {
   179     // <flag>=xxx form
   180     // [-|+]<flag> form
   181     if ((strncmp(obsolete_jvm_flags_1_5_0[i], s,
   182                strlen(obsolete_jvm_flags_1_5_0[i])) == 0) ||
   183         ((s[0] == '+' || s[0] == '-') &&
   184         (strncmp(obsolete_jvm_flags_1_5_0[i], &s[1],
   185                strlen(obsolete_jvm_flags_1_5_0[i])) == 0))) {
   186       return true;
   187     }
   188     i++;
   189   }
   190   return false;
   191 }
   193 // Constructs the system class path (aka boot class path) from the following
   194 // components, in order:
   195 //
   196 //     prefix           // from -Xbootclasspath/p:...
   197 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
   198 //     base             // from os::get_system_properties() or -Xbootclasspath=
   199 //     suffix           // from -Xbootclasspath/a:...
   200 //
   201 // java.endorsed.dirs is a list of directories; any jar or zip files in the
   202 // directories are added to the sysclasspath just before the base.
   203 //
   204 // This could be AllStatic, but it isn't needed after argument processing is
   205 // complete.
   206 class SysClassPath: public StackObj {
   207 public:
   208   SysClassPath(const char* base);
   209   ~SysClassPath();
   211   inline void set_base(const char* base);
   212   inline void add_prefix(const char* prefix);
   213   inline void add_suffix(const char* suffix);
   214   inline void reset_path(const char* base);
   216   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
   217   // property.  Must be called after all command-line arguments have been
   218   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
   219   // combined_path().
   220   void expand_endorsed();
   222   inline const char* get_base()     const { return _items[_scp_base]; }
   223   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
   224   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
   225   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
   227   // Combine all the components into a single c-heap-allocated string; caller
   228   // must free the string if/when no longer needed.
   229   char* combined_path();
   231 private:
   232   // Utility routines.
   233   static char* add_to_path(const char* path, const char* str, bool prepend);
   234   static char* add_jars_to_path(char* path, const char* directory);
   236   inline void reset_item_at(int index);
   238   // Array indices for the items that make up the sysclasspath.  All except the
   239   // base are allocated in the C heap and freed by this class.
   240   enum {
   241     _scp_prefix,        // from -Xbootclasspath/p:...
   242     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
   243     _scp_base,          // the default sysclasspath
   244     _scp_suffix,        // from -Xbootclasspath/a:...
   245     _scp_nitems         // the number of items, must be last.
   246   };
   248   const char* _items[_scp_nitems];
   249   DEBUG_ONLY(bool _expansion_done;)
   250 };
   252 SysClassPath::SysClassPath(const char* base) {
   253   memset(_items, 0, sizeof(_items));
   254   _items[_scp_base] = base;
   255   DEBUG_ONLY(_expansion_done = false;)
   256 }
   258 SysClassPath::~SysClassPath() {
   259   // Free everything except the base.
   260   for (int i = 0; i < _scp_nitems; ++i) {
   261     if (i != _scp_base) reset_item_at(i);
   262   }
   263   DEBUG_ONLY(_expansion_done = false;)
   264 }
   266 inline void SysClassPath::set_base(const char* base) {
   267   _items[_scp_base] = base;
   268 }
   270 inline void SysClassPath::add_prefix(const char* prefix) {
   271   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
   272 }
   274 inline void SysClassPath::add_suffix(const char* suffix) {
   275   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
   276 }
   278 inline void SysClassPath::reset_item_at(int index) {
   279   assert(index < _scp_nitems && index != _scp_base, "just checking");
   280   if (_items[index] != NULL) {
   281     FREE_C_HEAP_ARRAY(char, _items[index]);
   282     _items[index] = NULL;
   283   }
   284 }
   286 inline void SysClassPath::reset_path(const char* base) {
   287   // Clear the prefix and suffix.
   288   reset_item_at(_scp_prefix);
   289   reset_item_at(_scp_suffix);
   290   set_base(base);
   291 }
   293 //------------------------------------------------------------------------------
   295 void SysClassPath::expand_endorsed() {
   296   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
   298   const char* path = Arguments::get_property("java.endorsed.dirs");
   299   if (path == NULL) {
   300     path = Arguments::get_endorsed_dir();
   301     assert(path != NULL, "no default for java.endorsed.dirs");
   302   }
   304   char* expanded_path = NULL;
   305   const char separator = *os::path_separator();
   306   const char* const end = path + strlen(path);
   307   while (path < end) {
   308     const char* tmp_end = strchr(path, separator);
   309     if (tmp_end == NULL) {
   310       expanded_path = add_jars_to_path(expanded_path, path);
   311       path = end;
   312     } else {
   313       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
   314       memcpy(dirpath, path, tmp_end - path);
   315       dirpath[tmp_end - path] = '\0';
   316       expanded_path = add_jars_to_path(expanded_path, dirpath);
   317       FREE_C_HEAP_ARRAY(char, dirpath);
   318       path = tmp_end + 1;
   319     }
   320   }
   321   _items[_scp_endorsed] = expanded_path;
   322   DEBUG_ONLY(_expansion_done = true;)
   323 }
   325 // Combine the bootclasspath elements, some of which may be null, into a single
   326 // c-heap-allocated string.
   327 char* SysClassPath::combined_path() {
   328   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
   329   assert(_expansion_done, "must call expand_endorsed() first.");
   331   size_t lengths[_scp_nitems];
   332   size_t total_len = 0;
   334   const char separator = *os::path_separator();
   336   // Get the lengths.
   337   int i;
   338   for (i = 0; i < _scp_nitems; ++i) {
   339     if (_items[i] != NULL) {
   340       lengths[i] = strlen(_items[i]);
   341       // Include space for the separator char (or a NULL for the last item).
   342       total_len += lengths[i] + 1;
   343     }
   344   }
   345   assert(total_len > 0, "empty sysclasspath not allowed");
   347   // Copy the _items to a single string.
   348   char* cp = NEW_C_HEAP_ARRAY(char, total_len);
   349   char* cp_tmp = cp;
   350   for (i = 0; i < _scp_nitems; ++i) {
   351     if (_items[i] != NULL) {
   352       memcpy(cp_tmp, _items[i], lengths[i]);
   353       cp_tmp += lengths[i];
   354       *cp_tmp++ = separator;
   355     }
   356   }
   357   *--cp_tmp = '\0';     // Replace the extra separator.
   358   return cp;
   359 }
   361 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
   362 char*
   363 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
   364   char *cp;
   366   assert(str != NULL, "just checking");
   367   if (path == NULL) {
   368     size_t len = strlen(str) + 1;
   369     cp = NEW_C_HEAP_ARRAY(char, len);
   370     memcpy(cp, str, len);                       // copy the trailing null
   371   } else {
   372     const char separator = *os::path_separator();
   373     size_t old_len = strlen(path);
   374     size_t str_len = strlen(str);
   375     size_t len = old_len + str_len + 2;
   377     if (prepend) {
   378       cp = NEW_C_HEAP_ARRAY(char, len);
   379       char* cp_tmp = cp;
   380       memcpy(cp_tmp, str, str_len);
   381       cp_tmp += str_len;
   382       *cp_tmp = separator;
   383       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
   384       FREE_C_HEAP_ARRAY(char, path);
   385     } else {
   386       cp = REALLOC_C_HEAP_ARRAY(char, path, len);
   387       char* cp_tmp = cp + old_len;
   388       *cp_tmp = separator;
   389       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
   390     }
   391   }
   392   return cp;
   393 }
   395 // Scan the directory and append any jar or zip files found to path.
   396 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
   397 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
   398   DIR* dir = os::opendir(directory);
   399   if (dir == NULL) return path;
   401   char dir_sep[2] = { '\0', '\0' };
   402   size_t directory_len = strlen(directory);
   403   const char fileSep = *os::file_separator();
   404   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
   406   /* Scan the directory for jars/zips, appending them to path. */
   407   struct dirent *entry;
   408   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
   409   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
   410     const char* name = entry->d_name;
   411     const char* ext = name + strlen(name) - 4;
   412     bool isJarOrZip = ext > name &&
   413       (os::file_name_strcmp(ext, ".jar") == 0 ||
   414        os::file_name_strcmp(ext, ".zip") == 0);
   415     if (isJarOrZip) {
   416       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
   417       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
   418       path = add_to_path(path, jarpath, false);
   419       FREE_C_HEAP_ARRAY(char, jarpath);
   420     }
   421   }
   422   FREE_C_HEAP_ARRAY(char, dbuf);
   423   os::closedir(dir);
   424   return path;
   425 }
   427 // Parses a memory size specification string.
   428 static bool atomll(const char *s, jlong* result) {
   429   jlong n = 0;
   430   int args_read = sscanf(s, os::jlong_format_specifier(), &n);
   431   if (args_read != 1) {
   432     return false;
   433   }
   434   while (*s != '\0' && isdigit(*s)) {
   435     s++;
   436   }
   437   // 4705540: illegal if more characters are found after the first non-digit
   438   if (strlen(s) > 1) {
   439     return false;
   440   }
   441   switch (*s) {
   442     case 'T': case 't':
   443       *result = n * G * K;
   444       return true;
   445     case 'G': case 'g':
   446       *result = n * G;
   447       return true;
   448     case 'M': case 'm':
   449       *result = n * M;
   450       return true;
   451     case 'K': case 'k':
   452       *result = n * K;
   453       return true;
   454     case '\0':
   455       *result = n;
   456       return true;
   457     default:
   458       return false;
   459   }
   460 }
   462 Arguments::ArgsRange Arguments::check_memory_size(jlong size, jlong min_size) {
   463   if (size < min_size) return arg_too_small;
   464   // Check that size will fit in a size_t (only relevant on 32-bit)
   465   if ((julong) size > max_uintx) return arg_too_big;
   466   return arg_in_range;
   467 }
   469 // Describe an argument out of range error
   470 void Arguments::describe_range_error(ArgsRange errcode) {
   471   switch(errcode) {
   472   case arg_too_big:
   473     jio_fprintf(defaultStream::error_stream(),
   474                 "The specified size exceeds the maximum "
   475                 "representable size.\n");
   476     break;
   477   case arg_too_small:
   478   case arg_unreadable:
   479   case arg_in_range:
   480     // do nothing for now
   481     break;
   482   default:
   483     ShouldNotReachHere();
   484   }
   485 }
   487 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
   488   return CommandLineFlags::boolAtPut(name, &value, origin);
   489 }
   492 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
   493   double v;
   494   if (sscanf(value, "%lf", &v) != 1) {
   495     return false;
   496   }
   498   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
   499     return true;
   500   }
   501   return false;
   502 }
   505 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
   506   jlong v;
   507   intx intx_v;
   508   bool is_neg = false;
   509   // Check the sign first since atomll() parses only unsigned values.
   510   if (*value == '-') {
   511     if (!CommandLineFlags::intxAt(name, &intx_v)) {
   512       return false;
   513     }
   514     value++;
   515     is_neg = true;
   516   }
   517   if (!atomll(value, &v)) {
   518     return false;
   519   }
   520   intx_v = (intx) v;
   521   if (is_neg) {
   522     intx_v = -intx_v;
   523   }
   524   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
   525     return true;
   526   }
   527   uintx uintx_v = (uintx) v;
   528   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
   529     return true;
   530   }
   531   return false;
   532 }
   535 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
   536   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
   537   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
   538   FREE_C_HEAP_ARRAY(char, value);
   539   return true;
   540 }
   542 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
   543   const char* old_value = "";
   544   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
   545   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
   546   size_t new_len = strlen(new_value);
   547   const char* value;
   548   char* free_this_too = NULL;
   549   if (old_len == 0) {
   550     value = new_value;
   551   } else if (new_len == 0) {
   552     value = old_value;
   553   } else {
   554     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
   555     // each new setting adds another LINE to the switch:
   556     sprintf(buf, "%s\n%s", old_value, new_value);
   557     value = buf;
   558     free_this_too = buf;
   559   }
   560   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
   561   // CommandLineFlags always returns a pointer that needs freeing.
   562   FREE_C_HEAP_ARRAY(char, value);
   563   if (free_this_too != NULL) {
   564     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
   565     FREE_C_HEAP_ARRAY(char, free_this_too);
   566   }
   567   return true;
   568 }
   571 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
   573   // range of acceptable characters spelled out for portability reasons
   574 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
   575 #define BUFLEN 255
   576   char name[BUFLEN+1];
   577   char dummy;
   579   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
   580     return set_bool_flag(name, false, origin);
   581   }
   582   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
   583     return set_bool_flag(name, true, origin);
   584   }
   586   char punct;
   587   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
   588     const char* value = strchr(arg, '=') + 1;
   589     Flag* flag = Flag::find_flag(name, strlen(name));
   590     if (flag != NULL && flag->is_ccstr()) {
   591       if (flag->ccstr_accumulates()) {
   592         return append_to_string_flag(name, value, origin);
   593       } else {
   594         if (value[0] == '\0') {
   595           value = NULL;
   596         }
   597         return set_string_flag(name, value, origin);
   598       }
   599     }
   600   }
   602   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
   603     const char* value = strchr(arg, '=') + 1;
   604     // -XX:Foo:=xxx will reset the string flag to the given value.
   605     if (value[0] == '\0') {
   606       value = NULL;
   607     }
   608     return set_string_flag(name, value, origin);
   609   }
   611 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
   612 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
   613 #define        NUMBER_RANGE    "[0123456789]"
   614   char value[BUFLEN + 1];
   615   char value2[BUFLEN + 1];
   616   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
   617     // Looks like a floating-point number -- try again with more lenient format string
   618     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
   619       return set_fp_numeric_flag(name, value, origin);
   620     }
   621   }
   623 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
   624   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
   625     return set_numeric_flag(name, value, origin);
   626   }
   628   return false;
   629 }
   632 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
   633   assert(bldarray != NULL, "illegal argument");
   635   if (arg == NULL) {
   636     return;
   637   }
   639   int index = *count;
   641   // expand the array and add arg to the last element
   642   (*count)++;
   643   if (*bldarray == NULL) {
   644     *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
   645   } else {
   646     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
   647   }
   648   (*bldarray)[index] = strdup(arg);
   649 }
   651 void Arguments::build_jvm_args(const char* arg) {
   652   add_string(&_jvm_args_array, &_num_jvm_args, arg);
   653 }
   655 void Arguments::build_jvm_flags(const char* arg) {
   656   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
   657 }
   659 // utility function to return a string that concatenates all
   660 // strings in a given char** array
   661 const char* Arguments::build_resource_string(char** args, int count) {
   662   if (args == NULL || count == 0) {
   663     return NULL;
   664   }
   665   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
   666   for (int i = 1; i < count; i++) {
   667     length += strlen(args[i]) + 1; // add 1 for a space
   668   }
   669   char* s = NEW_RESOURCE_ARRAY(char, length);
   670   strcpy(s, args[0]);
   671   for (int j = 1; j < count; j++) {
   672     strcat(s, " ");
   673     strcat(s, args[j]);
   674   }
   675   return (const char*) s;
   676 }
   678 void Arguments::print_on(outputStream* st) {
   679   st->print_cr("VM Arguments:");
   680   if (num_jvm_flags() > 0) {
   681     st->print("jvm_flags: "); print_jvm_flags_on(st);
   682   }
   683   if (num_jvm_args() > 0) {
   684     st->print("jvm_args: "); print_jvm_args_on(st);
   685   }
   686   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
   687   st->print_cr("Launcher Type: %s", _sun_java_launcher);
   688 }
   690 void Arguments::print_jvm_flags_on(outputStream* st) {
   691   if (_num_jvm_flags > 0) {
   692     for (int i=0; i < _num_jvm_flags; i++) {
   693       st->print("%s ", _jvm_flags_array[i]);
   694     }
   695     st->print_cr("");
   696   }
   697 }
   699 void Arguments::print_jvm_args_on(outputStream* st) {
   700   if (_num_jvm_args > 0) {
   701     for (int i=0; i < _num_jvm_args; i++) {
   702       st->print("%s ", _jvm_args_array[i]);
   703     }
   704     st->print_cr("");
   705   }
   706 }
   708 bool Arguments::process_argument(const char* arg, jboolean ignore_unrecognized, FlagValueOrigin origin) {
   710   if (parse_argument(arg, origin)) {
   711     // do nothing
   712   } else if (made_obsolete_in_1_5_0(arg)) {
   713     jio_fprintf(defaultStream::error_stream(),
   714       "Warning: The flag %s has been EOL'd as of 1.5.0 and will"
   715       " be ignored\n", arg);
   716   } else {
   717     if (!ignore_unrecognized) {
   718       jio_fprintf(defaultStream::error_stream(),
   719                   "Unrecognized VM option '%s'\n", arg);
   720       // allow for commandline "commenting out" options like -XX:#+Verbose
   721       if (strlen(arg) == 0 || arg[0] != '#') {
   722         return false;
   723       }
   724     }
   725   }
   726   return true;
   727 }
   730 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
   731   FILE* stream = fopen(file_name, "rb");
   732   if (stream == NULL) {
   733     if (should_exist) {
   734       jio_fprintf(defaultStream::error_stream(),
   735                   "Could not open settings file %s\n", file_name);
   736       return false;
   737     } else {
   738       return true;
   739     }
   740   }
   742   char token[1024];
   743   int  pos = 0;
   745   bool in_white_space = true;
   746   bool in_comment     = false;
   747   bool in_quote       = false;
   748   char quote_c        = 0;
   749   bool result         = true;
   751   int c = getc(stream);
   752   while(c != EOF) {
   753     if (in_white_space) {
   754       if (in_comment) {
   755         if (c == '\n') in_comment = false;
   756       } else {
   757         if (c == '#') in_comment = true;
   758         else if (!isspace(c)) {
   759           in_white_space = false;
   760           token[pos++] = c;
   761         }
   762       }
   763     } else {
   764       if (c == '\n' || (!in_quote && isspace(c))) {
   765         // token ends at newline, or at unquoted whitespace
   766         // this allows a way to include spaces in string-valued options
   767         token[pos] = '\0';
   768         logOption(token);
   769         result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
   770         build_jvm_flags(token);
   771         pos = 0;
   772         in_white_space = true;
   773         in_quote = false;
   774       } else if (!in_quote && (c == '\'' || c == '"')) {
   775         in_quote = true;
   776         quote_c = c;
   777       } else if (in_quote && (c == quote_c)) {
   778         in_quote = false;
   779       } else {
   780         token[pos++] = c;
   781       }
   782     }
   783     c = getc(stream);
   784   }
   785   if (pos > 0) {
   786     token[pos] = '\0';
   787     result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
   788     build_jvm_flags(token);
   789   }
   790   fclose(stream);
   791   return result;
   792 }
   794 //=============================================================================================================
   795 // Parsing of properties (-D)
   797 const char* Arguments::get_property(const char* key) {
   798   return PropertyList_get_value(system_properties(), key);
   799 }
   801 bool Arguments::add_property(const char* prop) {
   802   const char* eq = strchr(prop, '=');
   803   char* key;
   804   // ns must be static--its address may be stored in a SystemProperty object.
   805   const static char ns[1] = {0};
   806   char* value = (char *)ns;
   808   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
   809   key = AllocateHeap(key_len + 1, "add_property");
   810   strncpy(key, prop, key_len);
   811   key[key_len] = '\0';
   813   if (eq != NULL) {
   814     size_t value_len = strlen(prop) - key_len - 1;
   815     value = AllocateHeap(value_len + 1, "add_property");
   816     strncpy(value, &prop[key_len + 1], value_len + 1);
   817   }
   819   if (strcmp(key, "java.compiler") == 0) {
   820     process_java_compiler_argument(value);
   821     FreeHeap(key);
   822     if (eq != NULL) {
   823       FreeHeap(value);
   824     }
   825     return true;
   826   }
   827   else if (strcmp(key, "sun.java.command") == 0) {
   829     _java_command = value;
   831     // don't add this property to the properties exposed to the java application
   832     FreeHeap(key);
   833     return true;
   834   }
   835   else if (strcmp(key, "sun.java.launcher.pid") == 0) {
   836     // launcher.pid property is private and is processed
   837     // in process_sun_java_launcher_properties();
   838     // the sun.java.launcher property is passed on to the java application
   839     FreeHeap(key);
   840     if (eq != NULL) {
   841       FreeHeap(value);
   842     }
   843     return true;
   844   }
   845   else if (strcmp(key, "java.vendor.url.bug") == 0) {
   846     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
   847     // its value without going through the property list or making a Java call.
   848     _java_vendor_url_bug = value;
   849   }
   851   // Create new property and add at the end of the list
   852   PropertyList_unique_add(&_system_properties, key, value);
   853   return true;
   854 }
   856 //===========================================================================================================
   857 // Setting int/mixed/comp mode flags
   859 void Arguments::set_mode_flags(Mode mode) {
   860   // Set up default values for all flags.
   861   // If you add a flag to any of the branches below,
   862   // add a default value for it here.
   863   set_java_compiler(false);
   864   _mode                      = mode;
   866   // Ensure Agent_OnLoad has the correct initial values.
   867   // This may not be the final mode; mode may change later in onload phase.
   868   PropertyList_unique_add(&_system_properties, "java.vm.info",
   869      (char*)Abstract_VM_Version::vm_info_string());
   871   UseInterpreter             = true;
   872   UseCompiler                = true;
   873   UseLoopCounter             = true;
   875   // Default values may be platform/compiler dependent -
   876   // use the saved values
   877   ClipInlining               = Arguments::_ClipInlining;
   878   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
   879   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
   880   BackgroundCompilation      = Arguments::_BackgroundCompilation;
   881   Tier2CompileThreshold      = Arguments::_Tier2CompileThreshold;
   883   // Change from defaults based on mode
   884   switch (mode) {
   885   default:
   886     ShouldNotReachHere();
   887     break;
   888   case _int:
   889     UseCompiler              = false;
   890     UseLoopCounter           = false;
   891     AlwaysCompileLoopMethods = false;
   892     UseOnStackReplacement    = false;
   893     break;
   894   case _mixed:
   895     // same as default
   896     break;
   897   case _comp:
   898     UseInterpreter           = false;
   899     BackgroundCompilation    = false;
   900     ClipInlining             = false;
   901     break;
   902   }
   903 }
   906 // Conflict: required to use shared spaces (-Xshare:on), but
   907 // incompatible command line options were chosen.
   909 static void no_shared_spaces() {
   910   if (RequireSharedSpaces) {
   911     jio_fprintf(defaultStream::error_stream(),
   912       "Class data sharing is inconsistent with other specified options.\n");
   913     vm_exit_during_initialization("Unable to use shared archive.", NULL);
   914   } else {
   915     FLAG_SET_DEFAULT(UseSharedSpaces, false);
   916   }
   917 }
   920 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
   921 // if it's not explictly set or unset. If the user has chosen
   922 // UseParNewGC and not explicitly set ParallelGCThreads we
   923 // set it, unless this is a single cpu machine.
   924 void Arguments::set_parnew_gc_flags() {
   925   assert(!UseSerialGC && !UseParallelGC, "control point invariant");
   927   // Turn off AdaptiveSizePolicy by default for parnew until it is
   928   // complete.
   929   if (UseParNewGC &&
   930       FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
   931     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
   932   }
   934   if (FLAG_IS_DEFAULT(UseParNewGC) && ParallelGCThreads > 1) {
   935     FLAG_SET_DEFAULT(UseParNewGC, true);
   936   } else if (UseParNewGC && ParallelGCThreads == 0) {
   937     FLAG_SET_DEFAULT(ParallelGCThreads,
   938                      Abstract_VM_Version::parallel_worker_threads());
   939     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
   940       FLAG_SET_DEFAULT(UseParNewGC, false);
   941     }
   942   }
   943   if (!UseParNewGC) {
   944     FLAG_SET_DEFAULT(ParallelGCThreads, 0);
   945   } else {
   946     no_shared_spaces();
   948     // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly,
   949     // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
   950     // we set them to 1024 and 1024.
   951     // See CR 6362902.
   952     if (FLAG_IS_DEFAULT(YoungPLABSize)) {
   953       FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
   954     }
   955     if (FLAG_IS_DEFAULT(OldPLABSize)) {
   956       FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
   957     }
   959     // AlwaysTenure flag should make ParNew to promote all at first collection.
   960     // See CR 6362902.
   961     if (AlwaysTenure) {
   962       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
   963     }
   964   }
   965 }
   967 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
   968 // sparc/solaris for certain applications, but would gain from
   969 // further optimization and tuning efforts, and would almost
   970 // certainly gain from analysis of platform and environment.
   971 void Arguments::set_cms_and_parnew_gc_flags() {
   972   if (UseSerialGC || UseParallelGC) {
   973     return;
   974   }
   976   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
   978   // If we are using CMS, we prefer to UseParNewGC,
   979   // unless explicitly forbidden.
   980   if (!UseParNewGC && FLAG_IS_DEFAULT(UseParNewGC)) {
   981     FLAG_SET_ERGO(bool, UseParNewGC, true);
   982   }
   984   // Turn off AdaptiveSizePolicy by default for cms until it is
   985   // complete.
   986   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
   987     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
   988   }
   990   // In either case, adjust ParallelGCThreads and/or UseParNewGC
   991   // as needed.
   992   if (UseParNewGC) {
   993     set_parnew_gc_flags();
   994   }
   996   // Now make adjustments for CMS
   997   size_t young_gen_per_worker;
   998   intx new_ratio;
   999   size_t min_new_default;
  1000   intx tenuring_default;
  1001   if (CMSUseOldDefaults) {  // old defaults: "old" as of 6.0
  1002     if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
  1003       FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
  1005     young_gen_per_worker = 4*M;
  1006     new_ratio = (intx)15;
  1007     min_new_default = 4*M;
  1008     tenuring_default = (intx)0;
  1009   } else { // new defaults: "new" as of 6.0
  1010     young_gen_per_worker = CMSYoungGenPerWorker;
  1011     new_ratio = (intx)7;
  1012     min_new_default = 16*M;
  1013     tenuring_default = (intx)4;
  1016   // Preferred young gen size for "short" pauses
  1017   const uintx parallel_gc_threads =
  1018     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
  1019   const size_t preferred_max_new_size_unaligned =
  1020     ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
  1021   const size_t preferred_max_new_size =
  1022     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
  1024   // Unless explicitly requested otherwise, size young gen
  1025   // for "short" pauses ~ 4M*ParallelGCThreads
  1026   if (FLAG_IS_DEFAULT(MaxNewSize)) {  // MaxNewSize not set at command-line
  1027     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
  1028       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
  1029     } else {
  1030       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
  1032     if(PrintGCDetails && Verbose) {
  1033       // Too early to use gclog_or_tty
  1034       tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
  1037   // Unless explicitly requested otherwise, prefer a large
  1038   // Old to Young gen size so as to shift the collection load
  1039   // to the old generation concurrent collector
  1040   if (FLAG_IS_DEFAULT(NewRatio)) {
  1041     FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
  1043     size_t min_new  = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size());
  1044     size_t prev_initial_size = initial_heap_size();
  1045     if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
  1046       set_initial_heap_size(min_new+OldSize);
  1047       // Currently minimum size and the initial heap sizes are the same.
  1048       set_min_heap_size(initial_heap_size());
  1049       if (PrintGCDetails && Verbose) {
  1050         warning("Initial heap size increased to " SIZE_FORMAT " M from "
  1051                 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
  1052                 initial_heap_size()/M, prev_initial_size/M);
  1055     // MaxHeapSize is aligned down in collectorPolicy
  1056     size_t max_heap = align_size_down(MaxHeapSize,
  1057                                       CardTableRS::ct_max_alignment_constraint());
  1059     if(PrintGCDetails && Verbose) {
  1060       // Too early to use gclog_or_tty
  1061       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
  1062            " initial_heap_size:  " SIZE_FORMAT
  1063            " max_heap: " SIZE_FORMAT,
  1064            min_heap_size(), initial_heap_size(), max_heap);
  1066     if (max_heap > min_new) {
  1067       // Unless explicitly requested otherwise, make young gen
  1068       // at least min_new, and at most preferred_max_new_size.
  1069       if (FLAG_IS_DEFAULT(NewSize)) {
  1070         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
  1071         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
  1072         if(PrintGCDetails && Verbose) {
  1073           // Too early to use gclog_or_tty
  1074           tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
  1077       // Unless explicitly requested otherwise, size old gen
  1078       // so that it's at least 3X of NewSize to begin with;
  1079       // later NewRatio will decide how it grows; see above.
  1080       if (FLAG_IS_DEFAULT(OldSize)) {
  1081         if (max_heap > NewSize) {
  1082           FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize,  max_heap - NewSize));
  1083           if(PrintGCDetails && Verbose) {
  1084             // Too early to use gclog_or_tty
  1085             tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
  1091   // Unless explicitly requested otherwise, definitely
  1092   // promote all objects surviving "tenuring_default" scavenges.
  1093   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
  1094       FLAG_IS_DEFAULT(SurvivorRatio)) {
  1095     FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
  1097   // If we decided above (or user explicitly requested)
  1098   // `promote all' (via MaxTenuringThreshold := 0),
  1099   // prefer minuscule survivor spaces so as not to waste
  1100   // space for (non-existent) survivors
  1101   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
  1102     FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
  1104   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
  1105   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
  1106   // This is done in order to make ParNew+CMS configuration to work
  1107   // with YoungPLABSize and OldPLABSize options.
  1108   // See CR 6362902.
  1109   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
  1110     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
  1111       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
  1112       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
  1113       // the value (either from the command line or ergonomics) of
  1114       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
  1115       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
  1117     else {
  1118       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
  1119       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
  1120       // we'll let it to take precedence.
  1121       jio_fprintf(defaultStream::error_stream(),
  1122                   "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified "
  1123                   "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n");
  1128 bool Arguments::should_auto_select_low_pause_collector() {
  1129   if (UseAutoGCSelectPolicy &&
  1130       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
  1131       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
  1132     if (PrintGCDetails) {
  1133       // Cannot use gclog_or_tty yet.
  1134       tty->print_cr("Automatic selection of the low pause collector"
  1135        " based on pause goal of %d (ms)", MaxGCPauseMillis);
  1137     return true;
  1139   return false;
  1142 void Arguments::set_ergonomics_flags() {
  1143   // Parallel GC is not compatible with sharing. If one specifies
  1144   // that they want sharing explicitly, do not set ergonmics flags.
  1145   if (DumpSharedSpaces || ForceSharedSpaces) {
  1146     return;
  1149   if (os::is_server_class_machine() && !force_client_mode ) {
  1150     // If no other collector is requested explicitly,
  1151     // let the VM select the collector based on
  1152     // machine class and automatic selection policy.
  1153     if (!UseSerialGC &&
  1154         !UseConcMarkSweepGC &&
  1155         !UseParNewGC &&
  1156         !DumpSharedSpaces &&
  1157         FLAG_IS_DEFAULT(UseParallelGC)) {
  1158       if (should_auto_select_low_pause_collector()) {
  1159         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
  1160       } else {
  1161         FLAG_SET_ERGO(bool, UseParallelGC, true);
  1163       no_shared_spaces();
  1168 void Arguments::set_parallel_gc_flags() {
  1169   // If parallel old was requested, automatically enable parallel scavenge.
  1170   if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
  1171     FLAG_SET_DEFAULT(UseParallelGC, true);
  1174   // If no heap maximum was requested explicitly, use some reasonable fraction
  1175   // of the physical memory, up to a maximum of 1GB.
  1176   if (UseParallelGC) {
  1177     FLAG_SET_ERGO(uintx, ParallelGCThreads,
  1178                   Abstract_VM_Version::parallel_worker_threads());
  1180     if (FLAG_IS_DEFAULT(MaxHeapSize)) {
  1181       const uint64_t reasonable_fraction =
  1182         os::physical_memory() / DefaultMaxRAMFraction;
  1183       const uint64_t maximum_size = (uint64_t) DefaultMaxRAM;
  1184       size_t reasonable_max =
  1185         (size_t) os::allocatable_physical_memory(reasonable_fraction);
  1186       if (reasonable_max > maximum_size) {
  1187         reasonable_max = maximum_size;
  1189       if (PrintGCDetails && Verbose) {
  1190         // Cannot use gclog_or_tty yet.
  1191         tty->print_cr("  Max heap size for server class platform "
  1192                       SIZE_FORMAT, reasonable_max);
  1194       // If the initial_heap_size has not been set with -Xms,
  1195       // then set it as fraction of size of physical memory
  1196       // respecting the maximum and minimum sizes of the heap.
  1197       if (initial_heap_size() == 0) {
  1198         const uint64_t reasonable_initial_fraction =
  1199           os::physical_memory() / DefaultInitialRAMFraction;
  1200         const size_t reasonable_initial =
  1201           (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
  1202         const size_t minimum_size = NewSize + OldSize;
  1203         set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
  1204                                   minimum_size));
  1205         // Currently the minimum size and the initial heap sizes are the same.
  1206         set_min_heap_size(initial_heap_size());
  1207         if (PrintGCDetails && Verbose) {
  1208           // Cannot use gclog_or_tty yet.
  1209           tty->print_cr("  Initial heap size for server class platform "
  1210                         SIZE_FORMAT, initial_heap_size());
  1212       } else {
  1213         // An minimum size was specified on the command line.  Be sure
  1214         // that the maximum size is consistent.
  1215         if (initial_heap_size() > reasonable_max) {
  1216           reasonable_max = initial_heap_size();
  1219       FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
  1222     // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
  1223     // SurvivorRatio has been set, reset their default values to SurvivorRatio +
  1224     // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
  1225     // See CR 6362902 for details.
  1226     if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
  1227       if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
  1228          FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
  1230       if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
  1231         FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
  1235     if (UseParallelOldGC) {
  1236       // Par compact uses lower default values since they are treated as
  1237       // minimums.  These are different defaults because of the different
  1238       // interpretation and are not ergonomically set.
  1239       if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
  1240         FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
  1242       if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
  1243         FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
  1249 // This must be called after ergonomics because we want bytecode rewriting
  1250 // if the server compiler is used, or if UseSharedSpaces is disabled.
  1251 void Arguments::set_bytecode_flags() {
  1252   // Better not attempt to store into a read-only space.
  1253   if (UseSharedSpaces) {
  1254     FLAG_SET_DEFAULT(RewriteBytecodes, false);
  1255     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
  1258   if (!RewriteBytecodes) {
  1259     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
  1263 // Aggressive optimization flags  -XX:+AggressiveOpts
  1264 void Arguments::set_aggressive_opts_flags() {
  1265 #ifdef COMPILER2
  1266   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
  1267     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
  1268       FLAG_SET_DEFAULT(EliminateAutoBox, true);
  1270     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
  1271       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
  1274     // Feed the cache size setting into the JDK
  1275     char buffer[1024];
  1276     sprintf(buffer, "java.lang.Integer.IntegerCache.high=%d", AutoBoxCacheMax);
  1277     add_property(buffer);
  1279   if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
  1280     FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
  1282 #endif
  1284   if (AggressiveOpts) {
  1285 // Sample flag setting code
  1286 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
  1287 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
  1288 //    }
  1292 //===========================================================================================================
  1293 // Parsing of java.compiler property
  1295 void Arguments::process_java_compiler_argument(char* arg) {
  1296   // For backwards compatibility, Djava.compiler=NONE or ""
  1297   // causes us to switch to -Xint mode UNLESS -Xdebug
  1298   // is also specified.
  1299   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
  1300     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
  1304 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
  1305   _sun_java_launcher = strdup(launcher);
  1308 bool Arguments::created_by_java_launcher() {
  1309   assert(_sun_java_launcher != NULL, "property must have value");
  1310   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
  1313 //===========================================================================================================
  1314 // Parsing of main arguments
  1316 bool Arguments::verify_percentage(uintx value, const char* name) {
  1317   if (value <= 100) {
  1318     return true;
  1320   jio_fprintf(defaultStream::error_stream(),
  1321               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
  1322               name, value);
  1323   return false;
  1326 static void set_serial_gc_flags() {
  1327   FLAG_SET_DEFAULT(UseSerialGC, true);
  1328   FLAG_SET_DEFAULT(UseParNewGC, false);
  1329   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
  1330   FLAG_SET_DEFAULT(UseParallelGC, false);
  1331   FLAG_SET_DEFAULT(UseParallelOldGC, false);
  1334 static bool verify_serial_gc_flags() {
  1335   return (UseSerialGC &&
  1336         !(UseParNewGC || UseConcMarkSweepGC || UseParallelGC ||
  1337           UseParallelOldGC));
  1340 // Check consistency of GC selection
  1341 bool Arguments::check_gc_consistency() {
  1342   bool status = true;
  1343   // Ensure that the user has not selected conflicting sets
  1344   // of collectors. [Note: this check is merely a user convenience;
  1345   // collectors over-ride each other so that only a non-conflicting
  1346   // set is selected; however what the user gets is not what they
  1347   // may have expected from the combination they asked for. It's
  1348   // better to reduce user confusion by not allowing them to
  1349   // select conflicting combinations.
  1350   uint i = 0;
  1351   if (UseSerialGC)                       i++;
  1352   if (UseConcMarkSweepGC || UseParNewGC) i++;
  1353   if (UseParallelGC || UseParallelOldGC) i++;
  1354   if (i > 1) {
  1355     jio_fprintf(defaultStream::error_stream(),
  1356                 "Conflicting collector combinations in option list; "
  1357                 "please refer to the release notes for the combinations "
  1358                 "allowed\n");
  1359     status = false;
  1362   return status;
  1365 // Check the consistency of vm_init_args
  1366 bool Arguments::check_vm_args_consistency() {
  1367   // Method for adding checks for flag consistency.
  1368   // The intent is to warn the user of all possible conflicts,
  1369   // before returning an error.
  1370   // Note: Needs platform-dependent factoring.
  1371   bool status = true;
  1373 #if ( (defined(COMPILER2) && defined(SPARC)))
  1374   // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
  1375   // on sparc doesn't require generation of a stub as is the case on, e.g.,
  1376   // x86.  Normally, VM_Version_init must be called from init_globals in
  1377   // init.cpp, which is called by the initial java thread *after* arguments
  1378   // have been parsed.  VM_Version_init gets called twice on sparc.
  1379   extern void VM_Version_init();
  1380   VM_Version_init();
  1381   if (!VM_Version::has_v9()) {
  1382     jio_fprintf(defaultStream::error_stream(),
  1383                 "V8 Machine detected, Server requires V9\n");
  1384     status = false;
  1386 #endif /* COMPILER2 && SPARC */
  1388   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
  1389   // builds so the cost of stack banging can be measured.
  1390 #if (defined(PRODUCT) && defined(SOLARIS))
  1391   if (!UseBoundThreads && !UseStackBanging) {
  1392     jio_fprintf(defaultStream::error_stream(),
  1393                 "-UseStackBanging conflicts with -UseBoundThreads\n");
  1395      status = false;
  1397 #endif
  1399   if (TLABRefillWasteFraction == 0) {
  1400     jio_fprintf(defaultStream::error_stream(),
  1401                 "TLABRefillWasteFraction should be a denominator, "
  1402                 "not " SIZE_FORMAT "\n",
  1403                 TLABRefillWasteFraction);
  1404     status = false;
  1407   status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
  1408                               "MaxLiveObjectEvacuationRatio");
  1409   status = status && verify_percentage(AdaptiveSizePolicyWeight,
  1410                               "AdaptiveSizePolicyWeight");
  1411   status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
  1412   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
  1413   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
  1414   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
  1416   if (MinHeapFreeRatio > MaxHeapFreeRatio) {
  1417     jio_fprintf(defaultStream::error_stream(),
  1418                 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
  1419                 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
  1420                 MinHeapFreeRatio, MaxHeapFreeRatio);
  1421     status = false;
  1423   // Keeping the heap 100% free is hard ;-) so limit it to 99%.
  1424   MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
  1426   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
  1427     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
  1430   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
  1431   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
  1432   if (GCTimeLimit == 100) {
  1433     // Turn off gc-overhead-limit-exceeded checks
  1434     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
  1437   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
  1439   // Check user specified sharing option conflict with Parallel GC
  1440   bool cannot_share = (UseConcMarkSweepGC || UseParallelGC ||
  1441                        UseParallelOldGC || UseParNewGC ||
  1442                        SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
  1444   if (cannot_share) {
  1445     // Either force sharing on by forcing the other options off, or
  1446     // force sharing off.
  1447     if (DumpSharedSpaces || ForceSharedSpaces) {
  1448       set_serial_gc_flags();
  1449       FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
  1450     } else {
  1451       no_shared_spaces();
  1455   status = status && check_gc_consistency();
  1457   if (_has_alloc_profile) {
  1458     if (UseParallelGC || UseParallelOldGC) {
  1459       jio_fprintf(defaultStream::error_stream(),
  1460                   "error:  invalid argument combination.\n"
  1461                   "Allocation profiling (-Xaprof) cannot be used together with "
  1462                   "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
  1463       status = false;
  1465     if (UseConcMarkSweepGC) {
  1466       jio_fprintf(defaultStream::error_stream(),
  1467                   "error:  invalid argument combination.\n"
  1468                   "Allocation profiling (-Xaprof) cannot be used together with "
  1469                   "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
  1470       status = false;
  1474   if (CMSIncrementalMode) {
  1475     if (!UseConcMarkSweepGC) {
  1476       jio_fprintf(defaultStream::error_stream(),
  1477                   "error:  invalid argument combination.\n"
  1478                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
  1479                   "selected in order\nto use CMSIncrementalMode.\n");
  1480       status = false;
  1481     } else if (!UseTLAB) {
  1482       jio_fprintf(defaultStream::error_stream(),
  1483                   "error:  CMSIncrementalMode requires thread-local "
  1484                   "allocation buffers\n(-XX:+UseTLAB).\n");
  1485       status = false;
  1486     } else {
  1487       status = status && verify_percentage(CMSIncrementalDutyCycle,
  1488                                   "CMSIncrementalDutyCycle");
  1489       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
  1490                                   "CMSIncrementalDutyCycleMin");
  1491       status = status && verify_percentage(CMSIncrementalSafetyFactor,
  1492                                   "CMSIncrementalSafetyFactor");
  1493       status = status && verify_percentage(CMSIncrementalOffset,
  1494                                   "CMSIncrementalOffset");
  1495       status = status && verify_percentage(CMSExpAvgFactor,
  1496                                   "CMSExpAvgFactor");
  1497       // If it was not set on the command line, set
  1498       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
  1499       if (CMSInitiatingOccupancyFraction < 0) {
  1500         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
  1505   if (UseNUMA && !UseTLAB) {
  1506     jio_fprintf(defaultStream::error_stream(),
  1507                 "error:  NUMA allocator (-XX:+UseNUMA) requires thread-local "
  1508                 "allocation\nbuffers (-XX:+UseTLAB).\n");
  1509     status = false;
  1512   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
  1513   // insists that we hold the requisite locks so that the iteration is
  1514   // MT-safe. For the verification at start-up and shut-down, we don't
  1515   // yet have a good way of acquiring and releasing these locks,
  1516   // which are not visible at the CollectedHeap level. We want to
  1517   // be able to acquire these locks and then do the iteration rather
  1518   // than just disable the lock verification. This will be fixed under
  1519   // bug 4788986.
  1520   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
  1521     if (VerifyGCStartAt == 0) {
  1522       warning("Heap verification at start-up disabled "
  1523               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
  1524       VerifyGCStartAt = 1;      // Disable verification at start-up
  1526     if (VerifyBeforeExit) {
  1527       warning("Heap verification at shutdown disabled "
  1528               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
  1529       VerifyBeforeExit = false; // Disable verification at shutdown
  1533   // Note: only executed in non-PRODUCT mode
  1534   if (!UseAsyncConcMarkSweepGC &&
  1535       (ExplicitGCInvokesConcurrent ||
  1536        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
  1537     jio_fprintf(defaultStream::error_stream(),
  1538                 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
  1539                 " with -UseAsyncConcMarkSweepGC");
  1540     status = false;
  1543   return status;
  1546 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
  1547   const char* option_type) {
  1548   if (ignore) return false;
  1550   const char* spacer = " ";
  1551   if (option_type == NULL) {
  1552     option_type = ++spacer; // Set both to the empty string.
  1555   if (os::obsolete_option(option)) {
  1556     jio_fprintf(defaultStream::error_stream(),
  1557                 "Obsolete %s%soption: %s\n", option_type, spacer,
  1558       option->optionString);
  1559     return false;
  1560   } else {
  1561     jio_fprintf(defaultStream::error_stream(),
  1562                 "Unrecognized %s%soption: %s\n", option_type, spacer,
  1563       option->optionString);
  1564     return true;
  1568 static const char* user_assertion_options[] = {
  1569   "-da", "-ea", "-disableassertions", "-enableassertions", 0
  1570 };
  1572 static const char* system_assertion_options[] = {
  1573   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
  1574 };
  1576 // Return true if any of the strings in null-terminated array 'names' matches.
  1577 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
  1578 // the option must match exactly.
  1579 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
  1580   bool tail_allowed) {
  1581   for (/* empty */; *names != NULL; ++names) {
  1582     if (match_option(option, *names, tail)) {
  1583       if (**tail == '\0' || tail_allowed && **tail == ':') {
  1584         return true;
  1588   return false;
  1591 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
  1592                                                   jlong* long_arg,
  1593                                                   jlong min_size) {
  1594   if (!atomll(s, long_arg)) return arg_unreadable;
  1595   return check_memory_size(*long_arg, min_size);
  1598 // Parse JavaVMInitArgs structure
  1600 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
  1601   // For components of the system classpath.
  1602   SysClassPath scp(Arguments::get_sysclasspath());
  1603   bool scp_assembly_required = false;
  1605   // Save default settings for some mode flags
  1606   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
  1607   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
  1608   Arguments::_ClipInlining             = ClipInlining;
  1609   Arguments::_BackgroundCompilation    = BackgroundCompilation;
  1610   Arguments::_Tier2CompileThreshold    = Tier2CompileThreshold;
  1612   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
  1613   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
  1614   if (result != JNI_OK) {
  1615     return result;
  1618   // Parse JavaVMInitArgs structure passed in
  1619   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
  1620   if (result != JNI_OK) {
  1621     return result;
  1624   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
  1625   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
  1626   if (result != JNI_OK) {
  1627     return result;
  1630   // Do final processing now that all arguments have been parsed
  1631   result = finalize_vm_init_args(&scp, scp_assembly_required);
  1632   if (result != JNI_OK) {
  1633     return result;
  1636   return JNI_OK;
  1640 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
  1641                                        SysClassPath* scp_p,
  1642                                        bool* scp_assembly_required_p,
  1643                                        FlagValueOrigin origin) {
  1644   // Remaining part of option string
  1645   const char* tail;
  1647   // iterate over arguments
  1648   for (int index = 0; index < args->nOptions; index++) {
  1649     bool is_absolute_path = false;  // for -agentpath vs -agentlib
  1651     const JavaVMOption* option = args->options + index;
  1653     if (!match_option(option, "-Djava.class.path", &tail) &&
  1654         !match_option(option, "-Dsun.java.command", &tail) &&
  1655         !match_option(option, "-Dsun.java.launcher", &tail)) {
  1657         // add all jvm options to the jvm_args string. This string
  1658         // is used later to set the java.vm.args PerfData string constant.
  1659         // the -Djava.class.path and the -Dsun.java.command options are
  1660         // omitted from jvm_args string as each have their own PerfData
  1661         // string constant object.
  1662         build_jvm_args(option->optionString);
  1665     // -verbose:[class/gc/jni]
  1666     if (match_option(option, "-verbose", &tail)) {
  1667       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
  1668         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
  1669         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
  1670       } else if (!strcmp(tail, ":gc")) {
  1671         FLAG_SET_CMDLINE(bool, PrintGC, true);
  1672         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
  1673       } else if (!strcmp(tail, ":jni")) {
  1674         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
  1676     // -da / -ea / -disableassertions / -enableassertions
  1677     // These accept an optional class/package name separated by a colon, e.g.,
  1678     // -da:java.lang.Thread.
  1679     } else if (match_option(option, user_assertion_options, &tail, true)) {
  1680       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
  1681       if (*tail == '\0') {
  1682         JavaAssertions::setUserClassDefault(enable);
  1683       } else {
  1684         assert(*tail == ':', "bogus match by match_option()");
  1685         JavaAssertions::addOption(tail + 1, enable);
  1687     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
  1688     } else if (match_option(option, system_assertion_options, &tail, false)) {
  1689       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
  1690       JavaAssertions::setSystemClassDefault(enable);
  1691     // -bootclasspath:
  1692     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
  1693       scp_p->reset_path(tail);
  1694       *scp_assembly_required_p = true;
  1695     // -bootclasspath/a:
  1696     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
  1697       scp_p->add_suffix(tail);
  1698       *scp_assembly_required_p = true;
  1699     // -bootclasspath/p:
  1700     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
  1701       scp_p->add_prefix(tail);
  1702       *scp_assembly_required_p = true;
  1703     // -Xrun
  1704     } else if (match_option(option, "-Xrun", &tail)) {
  1705       if(tail != NULL) {
  1706         const char* pos = strchr(tail, ':');
  1707         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
  1708         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
  1709         name[len] = '\0';
  1711         char *options = NULL;
  1712         if(pos != NULL) {
  1713           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
  1714           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
  1716 #ifdef JVMTI_KERNEL
  1717         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
  1718           warning("profiling and debugging agents are not supported with Kernel VM");
  1719         } else
  1720 #endif // JVMTI_KERNEL
  1721         add_init_library(name, options);
  1723     // -agentlib and -agentpath
  1724     } else if (match_option(option, "-agentlib:", &tail) ||
  1725           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
  1726       if(tail != NULL) {
  1727         const char* pos = strchr(tail, '=');
  1728         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
  1729         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
  1730         name[len] = '\0';
  1732         char *options = NULL;
  1733         if(pos != NULL) {
  1734           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
  1736 #ifdef JVMTI_KERNEL
  1737         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
  1738           warning("profiling and debugging agents are not supported with Kernel VM");
  1739         } else
  1740 #endif // JVMTI_KERNEL
  1741         add_init_agent(name, options, is_absolute_path);
  1744     // -javaagent
  1745     } else if (match_option(option, "-javaagent:", &tail)) {
  1746       if(tail != NULL) {
  1747         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
  1748         add_init_agent("instrument", options, false);
  1750     // -Xnoclassgc
  1751     } else if (match_option(option, "-Xnoclassgc", &tail)) {
  1752       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
  1753     // -Xincgc: i-CMS
  1754     } else if (match_option(option, "-Xincgc", &tail)) {
  1755       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
  1756       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
  1757     // -Xnoincgc: no i-CMS
  1758     } else if (match_option(option, "-Xnoincgc", &tail)) {
  1759       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
  1760       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
  1761     // -Xconcgc
  1762     } else if (match_option(option, "-Xconcgc", &tail)) {
  1763       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
  1764     // -Xnoconcgc
  1765     } else if (match_option(option, "-Xnoconcgc", &tail)) {
  1766       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
  1767     // -Xbatch
  1768     } else if (match_option(option, "-Xbatch", &tail)) {
  1769       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
  1770     // -Xmn for compatibility with other JVM vendors
  1771     } else if (match_option(option, "-Xmn", &tail)) {
  1772       jlong long_initial_eden_size = 0;
  1773       ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
  1774       if (errcode != arg_in_range) {
  1775         jio_fprintf(defaultStream::error_stream(),
  1776                     "Invalid initial eden size: %s\n", option->optionString);
  1777         describe_range_error(errcode);
  1778         return JNI_EINVAL;
  1780       FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
  1781       FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
  1782     // -Xms
  1783     } else if (match_option(option, "-Xms", &tail)) {
  1784       jlong long_initial_heap_size = 0;
  1785       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
  1786       if (errcode != arg_in_range) {
  1787         jio_fprintf(defaultStream::error_stream(),
  1788                     "Invalid initial heap size: %s\n", option->optionString);
  1789         describe_range_error(errcode);
  1790         return JNI_EINVAL;
  1792       set_initial_heap_size((size_t) long_initial_heap_size);
  1793       // Currently the minimum size and the initial heap sizes are the same.
  1794       set_min_heap_size(initial_heap_size());
  1795     // -Xmx
  1796     } else if (match_option(option, "-Xmx", &tail)) {
  1797       jlong long_max_heap_size = 0;
  1798       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
  1799       if (errcode != arg_in_range) {
  1800         jio_fprintf(defaultStream::error_stream(),
  1801                     "Invalid maximum heap size: %s\n", option->optionString);
  1802         describe_range_error(errcode);
  1803         return JNI_EINVAL;
  1805       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
  1806     // Xmaxf
  1807     } else if (match_option(option, "-Xmaxf", &tail)) {
  1808       int maxf = (int)(atof(tail) * 100);
  1809       if (maxf < 0 || maxf > 100) {
  1810         jio_fprintf(defaultStream::error_stream(),
  1811                     "Bad max heap free percentage size: %s\n",
  1812                     option->optionString);
  1813         return JNI_EINVAL;
  1814       } else {
  1815         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
  1817     // Xminf
  1818     } else if (match_option(option, "-Xminf", &tail)) {
  1819       int minf = (int)(atof(tail) * 100);
  1820       if (minf < 0 || minf > 100) {
  1821         jio_fprintf(defaultStream::error_stream(),
  1822                     "Bad min heap free percentage size: %s\n",
  1823                     option->optionString);
  1824         return JNI_EINVAL;
  1825       } else {
  1826         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
  1828     // -Xss
  1829     } else if (match_option(option, "-Xss", &tail)) {
  1830       jlong long_ThreadStackSize = 0;
  1831       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
  1832       if (errcode != arg_in_range) {
  1833         jio_fprintf(defaultStream::error_stream(),
  1834                     "Invalid thread stack size: %s\n", option->optionString);
  1835         describe_range_error(errcode);
  1836         return JNI_EINVAL;
  1838       // Internally track ThreadStackSize in units of 1024 bytes.
  1839       FLAG_SET_CMDLINE(intx, ThreadStackSize,
  1840                               round_to((int)long_ThreadStackSize, K) / K);
  1841     // -Xoss
  1842     } else if (match_option(option, "-Xoss", &tail)) {
  1843           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
  1844     // -Xmaxjitcodesize
  1845     } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
  1846       jlong long_ReservedCodeCacheSize = 0;
  1847       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
  1848                                             InitialCodeCacheSize);
  1849       if (errcode != arg_in_range) {
  1850         jio_fprintf(defaultStream::error_stream(),
  1851                     "Invalid maximum code cache size: %s\n",
  1852                     option->optionString);
  1853         describe_range_error(errcode);
  1854         return JNI_EINVAL;
  1856       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
  1857     // -green
  1858     } else if (match_option(option, "-green", &tail)) {
  1859       jio_fprintf(defaultStream::error_stream(),
  1860                   "Green threads support not available\n");
  1861           return JNI_EINVAL;
  1862     // -native
  1863     } else if (match_option(option, "-native", &tail)) {
  1864           // HotSpot always uses native threads, ignore silently for compatibility
  1865     // -Xsqnopause
  1866     } else if (match_option(option, "-Xsqnopause", &tail)) {
  1867           // EVM option, ignore silently for compatibility
  1868     // -Xrs
  1869     } else if (match_option(option, "-Xrs", &tail)) {
  1870           // Classic/EVM option, new functionality
  1871       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
  1872     } else if (match_option(option, "-Xusealtsigs", &tail)) {
  1873           // change default internal VM signals used - lower case for back compat
  1874       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
  1875     // -Xoptimize
  1876     } else if (match_option(option, "-Xoptimize", &tail)) {
  1877           // EVM option, ignore silently for compatibility
  1878     // -Xprof
  1879     } else if (match_option(option, "-Xprof", &tail)) {
  1880 #ifndef FPROF_KERNEL
  1881       _has_profile = true;
  1882 #else // FPROF_KERNEL
  1883       // do we have to exit?
  1884       warning("Kernel VM does not support flat profiling.");
  1885 #endif // FPROF_KERNEL
  1886     // -Xaprof
  1887     } else if (match_option(option, "-Xaprof", &tail)) {
  1888       _has_alloc_profile = true;
  1889     // -Xconcurrentio
  1890     } else if (match_option(option, "-Xconcurrentio", &tail)) {
  1891       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
  1892       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
  1893       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
  1894       FLAG_SET_CMDLINE(bool, UseTLAB, false);
  1895       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
  1897       // -Xinternalversion
  1898     } else if (match_option(option, "-Xinternalversion", &tail)) {
  1899       jio_fprintf(defaultStream::output_stream(), "%s\n",
  1900                   VM_Version::internal_vm_info_string());
  1901       vm_exit(0);
  1902 #ifndef PRODUCT
  1903     // -Xprintflags
  1904     } else if (match_option(option, "-Xprintflags", &tail)) {
  1905       CommandLineFlags::printFlags();
  1906       vm_exit(0);
  1907 #endif
  1908     // -D
  1909     } else if (match_option(option, "-D", &tail)) {
  1910       if (!add_property(tail)) {
  1911         return JNI_ENOMEM;
  1913       // Out of the box management support
  1914       if (match_option(option, "-Dcom.sun.management", &tail)) {
  1915         FLAG_SET_CMDLINE(bool, ManagementServer, true);
  1917     // -Xint
  1918     } else if (match_option(option, "-Xint", &tail)) {
  1919           set_mode_flags(_int);
  1920     // -Xmixed
  1921     } else if (match_option(option, "-Xmixed", &tail)) {
  1922           set_mode_flags(_mixed);
  1923     // -Xcomp
  1924     } else if (match_option(option, "-Xcomp", &tail)) {
  1925       // for testing the compiler; turn off all flags that inhibit compilation
  1926           set_mode_flags(_comp);
  1928     // -Xshare:dump
  1929     } else if (match_option(option, "-Xshare:dump", &tail)) {
  1930 #ifdef TIERED
  1931       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
  1932       set_mode_flags(_int);     // Prevent compilation, which creates objects
  1933 #elif defined(COMPILER2)
  1934       vm_exit_during_initialization(
  1935           "Dumping a shared archive is not supported on the Server JVM.", NULL);
  1936 #elif defined(KERNEL)
  1937       vm_exit_during_initialization(
  1938           "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
  1939 #else
  1940       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
  1941       set_mode_flags(_int);     // Prevent compilation, which creates objects
  1942 #endif
  1943     // -Xshare:on
  1944     } else if (match_option(option, "-Xshare:on", &tail)) {
  1945       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
  1946       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
  1947 #ifdef TIERED
  1948       FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
  1949 #endif // TIERED
  1950     // -Xshare:auto
  1951     } else if (match_option(option, "-Xshare:auto", &tail)) {
  1952       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
  1953       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
  1954     // -Xshare:off
  1955     } else if (match_option(option, "-Xshare:off", &tail)) {
  1956       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
  1957       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
  1959     // -Xverify
  1960     } else if (match_option(option, "-Xverify", &tail)) {
  1961       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
  1962         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
  1963         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
  1964       } else if (strcmp(tail, ":remote") == 0) {
  1965         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
  1966         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
  1967       } else if (strcmp(tail, ":none") == 0) {
  1968         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
  1969         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
  1970       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
  1971         return JNI_EINVAL;
  1973     // -Xdebug
  1974     } else if (match_option(option, "-Xdebug", &tail)) {
  1975       // note this flag has been used, then ignore
  1976       set_xdebug_mode(true);
  1977     // -Xnoagent
  1978     } else if (match_option(option, "-Xnoagent", &tail)) {
  1979       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
  1980     } else if (match_option(option, "-Xboundthreads", &tail)) {
  1981       // Bind user level threads to kernel threads (Solaris only)
  1982       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
  1983     } else if (match_option(option, "-Xloggc:", &tail)) {
  1984       // Redirect GC output to the file. -Xloggc:<filename>
  1985       // ostream_init_log(), when called will use this filename
  1986       // to initialize a fileStream.
  1987       _gc_log_filename = strdup(tail);
  1988       FLAG_SET_CMDLINE(bool, PrintGC, true);
  1989       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
  1990       FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
  1992     // JNI hooks
  1993     } else if (match_option(option, "-Xcheck", &tail)) {
  1994       if (!strcmp(tail, ":jni")) {
  1995         CheckJNICalls = true;
  1996       } else if (is_bad_option(option, args->ignoreUnrecognized,
  1997                                      "check")) {
  1998         return JNI_EINVAL;
  2000     } else if (match_option(option, "vfprintf", &tail)) {
  2001       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
  2002     } else if (match_option(option, "exit", &tail)) {
  2003       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
  2004     } else if (match_option(option, "abort", &tail)) {
  2005       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
  2006     // -XX:+AggressiveHeap
  2007     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
  2009       // This option inspects the machine and attempts to set various
  2010       // parameters to be optimal for long-running, memory allocation
  2011       // intensive jobs.  It is intended for machines with large
  2012       // amounts of cpu and memory.
  2014       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
  2015       // VM, but we may not be able to represent the total physical memory
  2016       // available (like having 8gb of memory on a box but using a 32bit VM).
  2017       // Thus, we need to make sure we're using a julong for intermediate
  2018       // calculations.
  2019       julong initHeapSize;
  2020       julong total_memory = os::physical_memory();
  2022       if (total_memory < (julong)256*M) {
  2023         jio_fprintf(defaultStream::error_stream(),
  2024                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
  2025         vm_exit(1);
  2028       // The heap size is half of available memory, or (at most)
  2029       // all of possible memory less 160mb (leaving room for the OS
  2030       // when using ISM).  This is the maximum; because adaptive sizing
  2031       // is turned on below, the actual space used may be smaller.
  2033       initHeapSize = MIN2(total_memory / (julong)2,
  2034                           total_memory - (julong)160*M);
  2036       // Make sure that if we have a lot of memory we cap the 32 bit
  2037       // process space.  The 64bit VM version of this function is a nop.
  2038       initHeapSize = os::allocatable_physical_memory(initHeapSize);
  2040       // The perm gen is separate but contiguous with the
  2041       // object heap (and is reserved with it) so subtract it
  2042       // from the heap size.
  2043       if (initHeapSize > MaxPermSize) {
  2044         initHeapSize = initHeapSize - MaxPermSize;
  2045       } else {
  2046         warning("AggressiveHeap and MaxPermSize values may conflict");
  2049       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
  2050          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
  2051          set_initial_heap_size(MaxHeapSize);
  2052          // Currently the minimum size and the initial heap sizes are the same.
  2053          set_min_heap_size(initial_heap_size());
  2055       if (FLAG_IS_DEFAULT(NewSize)) {
  2056          // Make the young generation 3/8ths of the total heap.
  2057          FLAG_SET_CMDLINE(uintx, NewSize,
  2058                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
  2059          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
  2062       FLAG_SET_DEFAULT(UseLargePages, true);
  2064       // Increase some data structure sizes for efficiency
  2065       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
  2066       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
  2067       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
  2069       // See the OldPLABSize comment below, but replace 'after promotion'
  2070       // with 'after copying'.  YoungPLABSize is the size of the survivor
  2071       // space per-gc-thread buffers.  The default is 4kw.
  2072       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
  2074       // OldPLABSize is the size of the buffers in the old gen that
  2075       // UseParallelGC uses to promote live data that doesn't fit in the
  2076       // survivor spaces.  At any given time, there's one for each gc thread.
  2077       // The default size is 1kw. These buffers are rarely used, since the
  2078       // survivor spaces are usually big enough.  For specjbb, however, there
  2079       // are occasions when there's lots of live data in the young gen
  2080       // and we end up promoting some of it.  We don't have a definite
  2081       // explanation for why bumping OldPLABSize helps, but the theory
  2082       // is that a bigger PLAB results in retaining something like the
  2083       // original allocation order after promotion, which improves mutator
  2084       // locality.  A minor effect may be that larger PLABs reduce the
  2085       // number of PLAB allocation events during gc.  The value of 8kw
  2086       // was arrived at by experimenting with specjbb.
  2087       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
  2089       // CompilationPolicyChoice=0 causes the server compiler to adopt
  2090       // a more conservative which-method-do-I-compile policy when one
  2091       // of the counters maintained by the interpreter trips.  The
  2092       // result is reduced startup time and improved specjbb and
  2093       // alacrity performance.  Zero is the default, but we set it
  2094       // explicitly here in case the default changes.
  2095       // See runtime/compilationPolicy.*.
  2096       FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
  2098       // Enable parallel GC and adaptive generation sizing
  2099       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
  2100       FLAG_SET_DEFAULT(ParallelGCThreads,
  2101                        Abstract_VM_Version::parallel_worker_threads());
  2103       // Encourage steady state memory management
  2104       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
  2106       // This appears to improve mutator locality
  2107       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
  2109       // Get around early Solaris scheduling bug
  2110       // (affinity vs other jobs on system)
  2111       // but disallow DR and offlining (5008695).
  2112       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
  2114     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
  2115       // The last option must always win.
  2116       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
  2117       FLAG_SET_CMDLINE(bool, NeverTenure, true);
  2118     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
  2119       // The last option must always win.
  2120       FLAG_SET_CMDLINE(bool, NeverTenure, false);
  2121       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
  2122     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
  2123                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
  2124       jio_fprintf(defaultStream::error_stream(),
  2125         "Please use CMSClassUnloadingEnabled in place of "
  2126         "CMSPermGenSweepingEnabled in the future\n");
  2127     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
  2128       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
  2129       jio_fprintf(defaultStream::error_stream(),
  2130         "Please use -XX:+UseGCOverheadLimit in place of "
  2131         "-XX:+UseGCTimeLimit in the future\n");
  2132     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
  2133       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
  2134       jio_fprintf(defaultStream::error_stream(),
  2135         "Please use -XX:-UseGCOverheadLimit in place of "
  2136         "-XX:-UseGCTimeLimit in the future\n");
  2137     // The TLE options are for compatibility with 1.3 and will be
  2138     // removed without notice in a future release.  These options
  2139     // are not to be documented.
  2140     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
  2141       // No longer used.
  2142     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
  2143       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
  2144     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
  2145       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
  2146     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
  2147       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
  2148     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
  2149       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
  2150     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
  2151       // No longer used.
  2152     } else if (match_option(option, "-XX:TLESize=", &tail)) {
  2153       jlong long_tlab_size = 0;
  2154       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
  2155       if (errcode != arg_in_range) {
  2156         jio_fprintf(defaultStream::error_stream(),
  2157                     "Invalid TLAB size: %s\n", option->optionString);
  2158         describe_range_error(errcode);
  2159         return JNI_EINVAL;
  2161       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
  2162     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
  2163       // No longer used.
  2164     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
  2165       FLAG_SET_CMDLINE(bool, UseTLAB, true);
  2166     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
  2167       FLAG_SET_CMDLINE(bool, UseTLAB, false);
  2168 SOLARIS_ONLY(
  2169     } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
  2170       warning("-XX:+UsePermISM is obsolete.");
  2171       FLAG_SET_CMDLINE(bool, UseISM, true);
  2172     } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
  2173       FLAG_SET_CMDLINE(bool, UseISM, false);
  2175     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
  2176       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
  2177       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
  2178     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
  2179       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
  2180       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
  2181     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
  2182 #ifdef SOLARIS
  2183       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
  2184       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
  2185       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
  2186       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
  2187 #else // ndef SOLARIS
  2188       jio_fprintf(defaultStream::error_stream(),
  2189                   "ExtendedDTraceProbes flag is only applicable on Solaris\n");
  2190       return JNI_EINVAL;
  2191 #endif // ndef SOLARIS
  2192     } else
  2193 #ifdef ASSERT
  2194     if (match_option(option, "-XX:+FullGCALot", &tail)) {
  2195       FLAG_SET_CMDLINE(bool, FullGCALot, true);
  2196       // disable scavenge before parallel mark-compact
  2197       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
  2198     } else
  2199 #endif
  2200     if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
  2201       julong cms_blocks_to_claim = (julong)atol(tail);
  2202       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
  2203       jio_fprintf(defaultStream::error_stream(),
  2204         "Please use -XX:CMSParPromoteBlocksToClaim in place of "
  2205         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
  2206     } else
  2207     if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
  2208       jlong old_plab_size = 0;
  2209       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
  2210       if (errcode != arg_in_range) {
  2211         jio_fprintf(defaultStream::error_stream(),
  2212                     "Invalid old PLAB size: %s\n", option->optionString);
  2213         describe_range_error(errcode);
  2214         return JNI_EINVAL;
  2216       FLAG_SET_CMDLINE(uintx, OldPLABSize, (julong)old_plab_size);
  2217       jio_fprintf(defaultStream::error_stream(),
  2218                   "Please use -XX:OldPLABSize in place of "
  2219                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
  2220     } else
  2221     if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
  2222       jlong young_plab_size = 0;
  2223       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
  2224       if (errcode != arg_in_range) {
  2225         jio_fprintf(defaultStream::error_stream(),
  2226                     "Invalid young PLAB size: %s\n", option->optionString);
  2227         describe_range_error(errcode);
  2228         return JNI_EINVAL;
  2230       FLAG_SET_CMDLINE(uintx, YoungPLABSize, (julong)young_plab_size);
  2231       jio_fprintf(defaultStream::error_stream(),
  2232                   "Please use -XX:YoungPLABSize in place of "
  2233                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
  2234     } else
  2235     if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
  2236       // Skip -XX:Flags= since that case has already been handled
  2237       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
  2238         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
  2239           return JNI_EINVAL;
  2242     // Unknown option
  2243     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
  2244       return JNI_ERR;
  2248   return JNI_OK;
  2251 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
  2252   // This must be done after all -D arguments have been processed.
  2253   scp_p->expand_endorsed();
  2255   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
  2256     // Assemble the bootclasspath elements into the final path.
  2257     Arguments::set_sysclasspath(scp_p->combined_path());
  2260   // This must be done after all arguments have been processed.
  2261   // java_compiler() true means set to "NONE" or empty.
  2262   if (java_compiler() && !xdebug_mode()) {
  2263     // For backwards compatibility, we switch to interpreted mode if
  2264     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
  2265     // not specified.
  2266     set_mode_flags(_int);
  2268   if (CompileThreshold == 0) {
  2269     set_mode_flags(_int);
  2272 #ifdef TIERED
  2273   // If we are using tiered compilation in the tiered vm then c1 will
  2274   // do the profiling and we don't want to waste that time in the
  2275   // interpreter.
  2276   if (TieredCompilation) {
  2277     ProfileInterpreter = false;
  2278   } else {
  2279     // Since we are running vanilla server we must adjust the compile threshold
  2280     // unless the user has already adjusted it because the default threshold assumes
  2281     // we will run tiered.
  2283     if (FLAG_IS_DEFAULT(CompileThreshold)) {
  2284       CompileThreshold = Tier2CompileThreshold;
  2287 #endif // TIERED
  2289 #ifndef COMPILER2
  2290   // Don't degrade server performance for footprint
  2291   if (FLAG_IS_DEFAULT(UseLargePages) &&
  2292       MaxHeapSize < LargePageHeapSizeThreshold) {
  2293     // No need for large granularity pages w/small heaps.
  2294     // Note that large pages are enabled/disabled for both the
  2295     // Java heap and the code cache.
  2296     FLAG_SET_DEFAULT(UseLargePages, false);
  2297     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
  2298     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
  2300 #else
  2301   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
  2302     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
  2304 #endif
  2306   if (!check_vm_args_consistency()) {
  2307     return JNI_ERR;
  2310   return JNI_OK;
  2313 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
  2314   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
  2315                                             scp_assembly_required_p);
  2318 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
  2319   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
  2320                                             scp_assembly_required_p);
  2323 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
  2324   const int N_MAX_OPTIONS = 64;
  2325   const int OPTION_BUFFER_SIZE = 1024;
  2326   char buffer[OPTION_BUFFER_SIZE];
  2328   // The variable will be ignored if it exceeds the length of the buffer.
  2329   // Don't check this variable if user has special privileges
  2330   // (e.g. unix su command).
  2331   if (os::getenv(name, buffer, sizeof(buffer)) &&
  2332       !os::have_special_privileges()) {
  2333     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
  2334     jio_fprintf(defaultStream::error_stream(),
  2335                 "Picked up %s: %s\n", name, buffer);
  2336     char* rd = buffer;                        // pointer to the input string (rd)
  2337     int i;
  2338     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
  2339       while (isspace(*rd)) rd++;              // skip whitespace
  2340       if (*rd == 0) break;                    // we re done when the input string is read completely
  2342       // The output, option string, overwrites the input string.
  2343       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
  2344       // input string (rd).
  2345       char* wrt = rd;
  2347       options[i++].optionString = wrt;        // Fill in option
  2348       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
  2349         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
  2350           int quote = *rd;                    // matching quote to look for
  2351           rd++;                               // don't copy open quote
  2352           while (*rd != quote) {              // include everything (even spaces) up until quote
  2353             if (*rd == 0) {                   // string termination means unmatched string
  2354               jio_fprintf(defaultStream::error_stream(),
  2355                           "Unmatched quote in %s\n", name);
  2356               return JNI_ERR;
  2358             *wrt++ = *rd++;                   // copy to option string
  2360           rd++;                               // don't copy close quote
  2361         } else {
  2362           *wrt++ = *rd++;                     // copy to option string
  2365       // Need to check if we're done before writing a NULL,
  2366       // because the write could be to the byte that rd is pointing to.
  2367       if (*rd++ == 0) {
  2368         *wrt = 0;
  2369         break;
  2371       *wrt = 0;                               // Zero terminate option
  2373     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
  2374     JavaVMInitArgs vm_args;
  2375     vm_args.version = JNI_VERSION_1_2;
  2376     vm_args.options = options;
  2377     vm_args.nOptions = i;
  2378     vm_args.ignoreUnrecognized = false;
  2380     if (PrintVMOptions) {
  2381       const char* tail;
  2382       for (int i = 0; i < vm_args.nOptions; i++) {
  2383         const JavaVMOption *option = vm_args.options + i;
  2384         if (match_option(option, "-XX:", &tail)) {
  2385           logOption(tail);
  2390     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
  2392   return JNI_OK;
  2395 // Parse entry point called from JNI_CreateJavaVM
  2397 jint Arguments::parse(const JavaVMInitArgs* args) {
  2399   // Sharing support
  2400   // Construct the path to the archive
  2401   char jvm_path[JVM_MAXPATHLEN];
  2402   os::jvm_path(jvm_path, sizeof(jvm_path));
  2403 #ifdef TIERED
  2404   if (strstr(jvm_path, "client") != NULL) {
  2405     force_client_mode = true;
  2407 #endif // TIERED
  2408   char *end = strrchr(jvm_path, *os::file_separator());
  2409   if (end != NULL) *end = '\0';
  2410   char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
  2411                                         strlen(os::file_separator()) + 20);
  2412   if (shared_archive_path == NULL) return JNI_ENOMEM;
  2413   strcpy(shared_archive_path, jvm_path);
  2414   strcat(shared_archive_path, os::file_separator());
  2415   strcat(shared_archive_path, "classes");
  2416   DEBUG_ONLY(strcat(shared_archive_path, "_g");)
  2417   strcat(shared_archive_path, ".jsa");
  2418   SharedArchivePath = shared_archive_path;
  2420   // Remaining part of option string
  2421   const char* tail;
  2423   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
  2424   bool settings_file_specified = false;
  2425   int index;
  2426   for (index = 0; index < args->nOptions; index++) {
  2427     const JavaVMOption *option = args->options + index;
  2428     if (match_option(option, "-XX:Flags=", &tail)) {
  2429       if (!process_settings_file(tail, true, args->ignoreUnrecognized)) {
  2430         return JNI_EINVAL;
  2432       settings_file_specified = true;
  2434     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
  2435       PrintVMOptions = true;
  2439   // Parse default .hotspotrc settings file
  2440   if (!settings_file_specified) {
  2441     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
  2442       return JNI_EINVAL;
  2446   if (PrintVMOptions) {
  2447     for (index = 0; index < args->nOptions; index++) {
  2448       const JavaVMOption *option = args->options + index;
  2449       if (match_option(option, "-XX:", &tail)) {
  2450         logOption(tail);
  2455   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
  2456   jint result = parse_vm_init_args(args);
  2457   if (result != JNI_OK) {
  2458     return result;
  2461 #ifndef PRODUCT
  2462   if (TraceBytecodesAt != 0) {
  2463     TraceBytecodes = true;
  2465   if (CountCompiledCalls) {
  2466     if (UseCounterDecay) {
  2467       warning("UseCounterDecay disabled because CountCalls is set");
  2468       UseCounterDecay = false;
  2471 #endif // PRODUCT
  2473   if (PrintGCDetails) {
  2474     // Turn on -verbose:gc options as well
  2475     PrintGC = true;
  2476     if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
  2477       TraceClassUnloading = true;
  2481 #ifdef SERIALGC
  2482   set_serial_gc_flags();
  2483 #endif // SERIALGC
  2484 #ifdef KERNEL
  2485   no_shared_spaces();
  2486 #endif // KERNEL
  2488   // Set flags based on ergonomics.
  2489   set_ergonomics_flags();
  2491   // Check the GC selections again.
  2492   if (!check_gc_consistency()) {
  2493     return JNI_EINVAL;
  2496   if (UseParallelGC || UseParallelOldGC) {
  2497     // Set some flags for ParallelGC if needed.
  2498     set_parallel_gc_flags();
  2499   } else if (UseConcMarkSweepGC) {
  2500     // Set some flags for CMS
  2501     set_cms_and_parnew_gc_flags();
  2502   } else if (UseParNewGC) {
  2503     // Set some flags for ParNew
  2504     set_parnew_gc_flags();
  2507 #ifdef SERIALGC
  2508   assert(verify_serial_gc_flags(), "SerialGC unset");
  2509 #endif // SERIALGC
  2511   // Set bytecode rewriting flags
  2512   set_bytecode_flags();
  2514   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
  2515   set_aggressive_opts_flags();
  2517 #ifdef CC_INTERP
  2518   // Biased locking is not implemented with c++ interpreter
  2519   FLAG_SET_DEFAULT(UseBiasedLocking, false);
  2520 #endif /* CC_INTERP */
  2522   if (PrintCommandLineFlags) {
  2523     CommandLineFlags::printSetFlags();
  2526 #ifdef ASSERT
  2527   if (PrintFlagsFinal) {
  2528     CommandLineFlags::printFlags();
  2530 #endif
  2532   return JNI_OK;
  2535 int Arguments::PropertyList_count(SystemProperty* pl) {
  2536   int count = 0;
  2537   while(pl != NULL) {
  2538     count++;
  2539     pl = pl->next();
  2541   return count;
  2544 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
  2545   assert(key != NULL, "just checking");
  2546   SystemProperty* prop;
  2547   for (prop = pl; prop != NULL; prop = prop->next()) {
  2548     if (strcmp(key, prop->key()) == 0) return prop->value();
  2550   return NULL;
  2553 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
  2554   int count = 0;
  2555   const char* ret_val = NULL;
  2557   while(pl != NULL) {
  2558     if(count >= index) {
  2559       ret_val = pl->key();
  2560       break;
  2562     count++;
  2563     pl = pl->next();
  2566   return ret_val;
  2569 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
  2570   int count = 0;
  2571   char* ret_val = NULL;
  2573   while(pl != NULL) {
  2574     if(count >= index) {
  2575       ret_val = pl->value();
  2576       break;
  2578     count++;
  2579     pl = pl->next();
  2582   return ret_val;
  2585 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
  2586   SystemProperty* p = *plist;
  2587   if (p == NULL) {
  2588     *plist = new_p;
  2589   } else {
  2590     while (p->next() != NULL) {
  2591       p = p->next();
  2593     p->set_next(new_p);
  2597 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
  2598   if (plist == NULL)
  2599     return;
  2601   SystemProperty* new_p = new SystemProperty(k, v, true);
  2602   PropertyList_add(plist, new_p);
  2605 // This add maintains unique property key in the list.
  2606 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) {
  2607   if (plist == NULL)
  2608     return;
  2610   // If property key exist then update with new value.
  2611   SystemProperty* prop;
  2612   for (prop = *plist; prop != NULL; prop = prop->next()) {
  2613     if (strcmp(k, prop->key()) == 0) {
  2614       prop->set_value(v);
  2615       return;
  2619   PropertyList_add(plist, k, v);
  2622 #ifdef KERNEL
  2623 char *Arguments::get_kernel_properties() {
  2624   // Find properties starting with kernel and append them to string
  2625   // We need to find out how long they are first because the URL's that they
  2626   // might point to could get long.
  2627   int length = 0;
  2628   SystemProperty* prop;
  2629   for (prop = _system_properties; prop != NULL; prop = prop->next()) {
  2630     if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
  2631       length += (strlen(prop->key()) + strlen(prop->value()) + 5);  // "-D ="
  2634   // Add one for null terminator.
  2635   char *props = AllocateHeap(length + 1, "get_kernel_properties");
  2636   if (length != 0) {
  2637     int pos = 0;
  2638     for (prop = _system_properties; prop != NULL; prop = prop->next()) {
  2639       if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
  2640         jio_snprintf(&props[pos], length-pos,
  2641                      "-D%s=%s ", prop->key(), prop->value());
  2642         pos = strlen(props);
  2646   // null terminate props in case of null
  2647   props[length] = '\0';
  2648   return props;
  2650 #endif // KERNEL
  2652 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
  2653 // Returns true if all of the source pointed by src has been copied over to
  2654 // the destination buffer pointed by buf. Otherwise, returns false.
  2655 // Notes:
  2656 // 1. If the length (buflen) of the destination buffer excluding the
  2657 // NULL terminator character is not long enough for holding the expanded
  2658 // pid characters, it also returns false instead of returning the partially
  2659 // expanded one.
  2660 // 2. The passed in "buflen" should be large enough to hold the null terminator.
  2661 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
  2662                                 char* buf, size_t buflen) {
  2663   const char* p = src;
  2664   char* b = buf;
  2665   const char* src_end = &src[srclen];
  2666   char* buf_end = &buf[buflen - 1];
  2668   while (p < src_end && b < buf_end) {
  2669     if (*p == '%') {
  2670       switch (*(++p)) {
  2671       case '%':         // "%%" ==> "%"
  2672         *b++ = *p++;
  2673         break;
  2674       case 'p':  {       //  "%p" ==> current process id
  2675         // buf_end points to the character before the last character so
  2676         // that we could write '\0' to the end of the buffer.
  2677         size_t buf_sz = buf_end - b + 1;
  2678         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
  2680         // if jio_snprintf fails or the buffer is not long enough to hold
  2681         // the expanded pid, returns false.
  2682         if (ret < 0 || ret >= (int)buf_sz) {
  2683           return false;
  2684         } else {
  2685           b += ret;
  2686           assert(*b == '\0', "fail in copy_expand_pid");
  2687           if (p == src_end && b == buf_end + 1) {
  2688             // reach the end of the buffer.
  2689             return true;
  2692         p++;
  2693         break;
  2695       default :
  2696         *b++ = '%';
  2698     } else {
  2699       *b++ = *p++;
  2702   *b = '\0';
  2703   return (p == src_end); // return false if not all of the source was copied

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