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