1 /*
   2  * Copyright (c) 1997, 2010, 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     // don't add this property to the properties exposed to the java application
 922     FreeHeap(key);
 923     return true;
 924   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
 925     // launcher.pid property is private and is processed
 926     // in process_sun_java_launcher_properties();
 927     // the sun.java.launcher property is passed on to the java application
 928     FreeHeap(key);
 929     if (eq != NULL) {
 930       FreeHeap(value);
 931     }
 932     return true;
 933   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
 934     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
 935     // its value without going through the property list or making a Java call.
 936     _java_vendor_url_bug = value;
 937   } else if (strcmp(key, "sun.boot.library.path") == 0) {
 938     PropertyList_unique_add(&_system_properties, key, value, true);
 939     return true;
 940   }
 941   // Create new property and add at the end of the list
 942   PropertyList_unique_add(&_system_properties, key, value);
 943   return true;
 944 }
 945 
 946 //===========================================================================================================
 947 // Setting int/mixed/comp mode flags
 948 
 949 void Arguments::set_mode_flags(Mode mode) {
 950   // Set up default values for all flags.
 951   // If you add a flag to any of the branches below,
 952   // add a default value for it here.
 953   set_java_compiler(false);
 954   _mode                      = mode;
 955 
 956   // Ensure Agent_OnLoad has the correct initial values.
 957   // This may not be the final mode; mode may change later in onload phase.
 958   PropertyList_unique_add(&_system_properties, "java.vm.info",
 959                           (char*)Abstract_VM_Version::vm_info_string(), false);
 960 
 961   UseInterpreter             = true;
 962   UseCompiler                = true;
 963   UseLoopCounter             = true;
 964 
 965   // Default values may be platform/compiler dependent -
 966   // use the saved values
 967   ClipInlining               = Arguments::_ClipInlining;
 968   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
 969   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
 970   BackgroundCompilation      = Arguments::_BackgroundCompilation;
 971 
 972   // Change from defaults based on mode
 973   switch (mode) {
 974   default:
 975     ShouldNotReachHere();
 976     break;
 977   case _int:
 978     UseCompiler              = false;
 979     UseLoopCounter           = false;
 980     AlwaysCompileLoopMethods = false;
 981     UseOnStackReplacement    = false;
 982     break;
 983   case _mixed:
 984     // same as default
 985     break;
 986   case _comp:
 987     UseInterpreter           = false;
 988     BackgroundCompilation    = false;
 989     ClipInlining             = false;
 990     break;
 991   }
 992 }
 993 
 994 // Conflict: required to use shared spaces (-Xshare:on), but
 995 // incompatible command line options were chosen.
 996 
 997 static void no_shared_spaces() {
 998   if (RequireSharedSpaces) {
 999     jio_fprintf(defaultStream::error_stream(),
1000       "Class data sharing is inconsistent with other specified options.\n");
1001     vm_exit_during_initialization("Unable to use shared archive.", NULL);
1002   } else {
1003     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1004   }
1005 }
1006 
1007 void Arguments::check_compressed_oops_compat() {
1008 #ifdef _LP64
1009   assert(UseCompressedOops, "Precondition");
1010 #  if defined(COMPILER1) && !defined(TIERED)
1011   // Until c1 supports compressed oops turn them off.
1012   FLAG_SET_DEFAULT(UseCompressedOops, false);
1013 #  else
1014   // Is it on by default or set on ergonomically
1015   bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops);
1016 
1017   // Tiered currently doesn't work with compressed oops
1018   if (TieredCompilation) {
1019     if (is_on_by_default) {
1020       FLAG_SET_DEFAULT(UseCompressedOops, false);
1021       return;
1022     } else {
1023       vm_exit_during_initialization(
1024         "Tiered compilation is not supported with compressed oops yet", NULL);
1025     }
1026   }
1027 
1028   // If dumping an archive or forcing its use, disable compressed oops if possible
1029   if (DumpSharedSpaces || RequireSharedSpaces) {
1030     if (is_on_by_default) {
1031       FLAG_SET_DEFAULT(UseCompressedOops, false);
1032       return;
1033     } else {
1034       vm_exit_during_initialization(
1035         "Class Data Sharing is not supported with compressed oops yet", NULL);
1036     }
1037   } else if (UseSharedSpaces) {
1038     // UseSharedSpaces is on by default. With compressed oops, we turn it off.
1039     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1040   }
1041 
1042 #  endif // defined(COMPILER1) && !defined(TIERED)
1043 #endif // _LP64
1044 }
1045 
1046 void Arguments::set_tiered_flags() {
1047   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1048     FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
1049   }
1050   if (CompilationPolicyChoice < 2) {
1051     vm_exit_during_initialization(
1052       "Incompatible compilation policy selected", NULL);
1053   }
1054   // Increase the code cache size - tiered compiles a lot more.
1055   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1056     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1057   }
1058 }
1059 
1060 #ifndef KERNEL
1061 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1062 // if it's not explictly set or unset. If the user has chosen
1063 // UseParNewGC and not explicitly set ParallelGCThreads we
1064 // set it, unless this is a single cpu machine.
1065 void Arguments::set_parnew_gc_flags() {
1066   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1067          "control point invariant");
1068   assert(UseParNewGC, "Error");
1069 
1070   // Turn off AdaptiveSizePolicy by default for parnew until it is
1071   // complete.
1072   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1073     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1074   }
1075 
1076   if (ParallelGCThreads == 0) {
1077     FLAG_SET_DEFAULT(ParallelGCThreads,
1078                      Abstract_VM_Version::parallel_worker_threads());
1079     if (ParallelGCThreads == 1) {
1080       FLAG_SET_DEFAULT(UseParNewGC, false);
1081       FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1082     }
1083   }
1084   if (UseParNewGC) {
1085     // CDS doesn't work with ParNew yet
1086     no_shared_spaces();
1087 
1088     // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1089     // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1090     // we set them to 1024 and 1024.
1091     // See CR 6362902.
1092     if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1093       FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1094     }
1095     if (FLAG_IS_DEFAULT(OldPLABSize)) {
1096       FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1097     }
1098 
1099     // AlwaysTenure flag should make ParNew promote all at first collection.
1100     // See CR 6362902.
1101     if (AlwaysTenure) {
1102       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1103     }
1104     // When using compressed oops, we use local overflow stacks,
1105     // rather than using a global overflow list chained through
1106     // the klass word of the object's pre-image.
1107     if (UseCompressedOops && !ParGCUseLocalOverflow) {
1108       if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1109         warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1110       }
1111       FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1112     }
1113     assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1114   }
1115 }
1116 
1117 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1118 // sparc/solaris for certain applications, but would gain from
1119 // further optimization and tuning efforts, and would almost
1120 // certainly gain from analysis of platform and environment.
1121 void Arguments::set_cms_and_parnew_gc_flags() {
1122   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1123   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1124 
1125   // If we are using CMS, we prefer to UseParNewGC,
1126   // unless explicitly forbidden.
1127   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1128     FLAG_SET_ERGO(bool, UseParNewGC, true);
1129   }
1130 
1131   // Turn off AdaptiveSizePolicy by default for cms until it is
1132   // complete.
1133   if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1134     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1135   }
1136 
1137   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1138   // as needed.
1139   if (UseParNewGC) {
1140     set_parnew_gc_flags();
1141   }
1142 
1143   // Now make adjustments for CMS
1144   size_t young_gen_per_worker;
1145   intx new_ratio;
1146   size_t min_new_default;
1147   intx tenuring_default;
1148   if (CMSUseOldDefaults) {  // old defaults: "old" as of 6.0
1149     if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1150       FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1151     }
1152     young_gen_per_worker = 4*M;
1153     new_ratio = (intx)15;
1154     min_new_default = 4*M;
1155     tenuring_default = (intx)0;
1156   } else { // new defaults: "new" as of 6.0
1157     young_gen_per_worker = CMSYoungGenPerWorker;
1158     new_ratio = (intx)7;
1159     min_new_default = 16*M;
1160     tenuring_default = (intx)4;
1161   }
1162 
1163   // Preferred young gen size for "short" pauses
1164   const uintx parallel_gc_threads =
1165     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1166   const size_t preferred_max_new_size_unaligned =
1167     ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1168   const size_t preferred_max_new_size =
1169     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1170 
1171   // Unless explicitly requested otherwise, size young gen
1172   // for "short" pauses ~ 4M*ParallelGCThreads
1173 
1174   // If either MaxNewSize or NewRatio is set on the command line,
1175   // assume the user is trying to set the size of the young gen.
1176 
1177   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1178 
1179     // Set MaxNewSize to our calculated preferred_max_new_size unless
1180     // NewSize was set on the command line and it is larger than
1181     // preferred_max_new_size.
1182     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1183       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1184     } else {
1185       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1186     }
1187     if (PrintGCDetails && Verbose) {
1188       // Too early to use gclog_or_tty
1189       tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1190     }
1191 
1192     // Unless explicitly requested otherwise, prefer a large
1193     // Old to Young gen size so as to shift the collection load
1194     // to the old generation concurrent collector
1195 
1196     // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1197     // then NewSize and OldSize may be calculated.  That would
1198     // generally lead to some differences with ParNewGC for which
1199     // there was no obvious reason.  Also limit to the case where
1200     // MaxNewSize has not been set.
1201 
1202     FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1203 
1204     // Code along this path potentially sets NewSize and OldSize
1205 
1206     // Calculate the desired minimum size of the young gen but if
1207     // NewSize has been set on the command line, use it here since
1208     // it should be the final value.
1209     size_t min_new;
1210     if (FLAG_IS_DEFAULT(NewSize)) {
1211       min_new = align_size_up(ScaleForWordSize(min_new_default),
1212                               os::vm_page_size());
1213     } else {
1214       min_new = NewSize;
1215     }
1216     size_t prev_initial_size = InitialHeapSize;
1217     if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1218       FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1219       // Currently minimum size and the initial heap sizes are the same.
1220       set_min_heap_size(InitialHeapSize);
1221       if (PrintGCDetails && Verbose) {
1222         warning("Initial heap size increased to " SIZE_FORMAT " M from "
1223                 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1224                 InitialHeapSize/M, prev_initial_size/M);
1225       }
1226     }
1227 
1228     // MaxHeapSize is aligned down in collectorPolicy
1229     size_t max_heap =
1230       align_size_down(MaxHeapSize,
1231                       CardTableRS::ct_max_alignment_constraint());
1232 
1233     if (PrintGCDetails && Verbose) {
1234       // Too early to use gclog_or_tty
1235       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1236            " initial_heap_size:  " SIZE_FORMAT
1237            " max_heap: " SIZE_FORMAT,
1238            min_heap_size(), InitialHeapSize, max_heap);
1239     }
1240     if (max_heap > min_new) {
1241       // Unless explicitly requested otherwise, make young gen
1242       // at least min_new, and at most preferred_max_new_size.
1243       if (FLAG_IS_DEFAULT(NewSize)) {
1244         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1245         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1246         if (PrintGCDetails && Verbose) {
1247           // Too early to use gclog_or_tty
1248           tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1249         }
1250       }
1251       // Unless explicitly requested otherwise, size old gen
1252       // so that it's at least 3X of NewSize to begin with;
1253       // later NewRatio will decide how it grows; see above.
1254       if (FLAG_IS_DEFAULT(OldSize)) {
1255         if (max_heap > NewSize) {
1256           FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1257           if (PrintGCDetails && Verbose) {
1258             // Too early to use gclog_or_tty
1259             tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1260           }
1261         }
1262       }
1263     }
1264   }
1265   // Unless explicitly requested otherwise, definitely
1266   // promote all objects surviving "tenuring_default" scavenges.
1267   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1268       FLAG_IS_DEFAULT(SurvivorRatio)) {
1269     FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1270   }
1271   // If we decided above (or user explicitly requested)
1272   // `promote all' (via MaxTenuringThreshold := 0),
1273   // prefer minuscule survivor spaces so as not to waste
1274   // space for (non-existent) survivors
1275   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1276     FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1277   }
1278   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1279   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1280   // This is done in order to make ParNew+CMS configuration to work
1281   // with YoungPLABSize and OldPLABSize options.
1282   // See CR 6362902.
1283   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1284     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1285       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1286       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1287       // the value (either from the command line or ergonomics) of
1288       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1289       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1290     } else {
1291       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1292       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1293       // we'll let it to take precedence.
1294       jio_fprintf(defaultStream::error_stream(),
1295                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1296                   " options are specified for the CMS collector."
1297                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1298     }
1299   }
1300   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1301     // OldPLAB sizing manually turned off: Use a larger default setting,
1302     // unless it was manually specified. This is because a too-low value
1303     // will slow down scavenges.
1304     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1305       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1306     }
1307   }
1308   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1309   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1310   // If either of the static initialization defaults have changed, note this
1311   // modification.
1312   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1313     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1314   }
1315   if (PrintGCDetails && Verbose) {
1316     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1317       MarkStackSize / K, MarkStackSizeMax / K);
1318     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1319   }
1320 }
1321 #endif // KERNEL
1322 
1323 void set_object_alignment() {
1324   // Object alignment.
1325   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1326   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1327   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1328   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1329   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1330   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1331 
1332   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1333   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1334 
1335   // Oop encoding heap max
1336   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1337 
1338 #ifndef KERNEL
1339   // Set CMS global values
1340   CompactibleFreeListSpace::set_cms_values();
1341 #endif // KERNEL
1342 }
1343 
1344 bool verify_object_alignment() {
1345   // Object alignment.
1346   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1347     jio_fprintf(defaultStream::error_stream(),
1348                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1349                 (int)ObjectAlignmentInBytes);
1350     return false;
1351   }
1352   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1353     jio_fprintf(defaultStream::error_stream(),
1354                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1355                 (int)ObjectAlignmentInBytes, BytesPerLong);
1356     return false;
1357   }
1358   // It does not make sense to have big object alignment
1359   // since a space lost due to alignment will be greater
1360   // then a saved space from compressed oops.
1361   if ((int)ObjectAlignmentInBytes > 256) {
1362     jio_fprintf(defaultStream::error_stream(),
1363                 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1364                 (int)ObjectAlignmentInBytes);
1365     return false;
1366   }
1367   // In case page size is very small.
1368   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1369     jio_fprintf(defaultStream::error_stream(),
1370                 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1371                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1372     return false;
1373   }
1374   return true;
1375 }
1376 
1377 inline uintx max_heap_for_compressed_oops() {
1378   // Avoid sign flip.
1379   if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1380     return 0;
1381   }
1382   LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1383   NOT_LP64(ShouldNotReachHere(); return 0);
1384 }
1385 
1386 bool Arguments::should_auto_select_low_pause_collector() {
1387   if (UseAutoGCSelectPolicy &&
1388       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1389       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1390     if (PrintGCDetails) {
1391       // Cannot use gclog_or_tty yet.
1392       tty->print_cr("Automatic selection of the low pause collector"
1393        " based on pause goal of %d (ms)", MaxGCPauseMillis);
1394     }
1395     return true;
1396   }
1397   return false;
1398 }
1399 
1400 void Arguments::set_ergonomics_flags() {
1401   // Parallel GC is not compatible with sharing. If one specifies
1402   // that they want sharing explicitly, do not set ergonomics flags.
1403   if (DumpSharedSpaces || ForceSharedSpaces) {
1404     return;
1405   }
1406 
1407   if (os::is_server_class_machine() && !force_client_mode ) {
1408     // If no other collector is requested explicitly,
1409     // let the VM select the collector based on
1410     // machine class and automatic selection policy.
1411     if (!UseSerialGC &&
1412         !UseConcMarkSweepGC &&
1413         !UseG1GC &&
1414         !UseParNewGC &&
1415         !DumpSharedSpaces &&
1416         FLAG_IS_DEFAULT(UseParallelGC)) {
1417       if (should_auto_select_low_pause_collector()) {
1418         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1419       } else {
1420         FLAG_SET_ERGO(bool, UseParallelGC, true);
1421       }
1422       no_shared_spaces();
1423     }
1424   }
1425 
1426 #ifndef ZERO
1427 #ifdef _LP64
1428   // Check that UseCompressedOops can be set with the max heap size allocated
1429   // by ergonomics.
1430   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1431 #if !defined(COMPILER1) || defined(TIERED)
1432     if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1433       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1434     }
1435 #endif
1436 #ifdef _WIN64
1437     if (UseLargePages && UseCompressedOops) {
1438       // Cannot allocate guard pages for implicit checks in indexed addressing
1439       // mode, when large pages are specified on windows.
1440       // This flag could be switched ON if narrow oop base address is set to 0,
1441       // see code in Universe::initialize_heap().
1442       Universe::set_narrow_oop_use_implicit_null_checks(false);
1443     }
1444 #endif //  _WIN64
1445   } else {
1446     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1447       warning("Max heap size too large for Compressed Oops");
1448       FLAG_SET_DEFAULT(UseCompressedOops, false);
1449     }
1450   }
1451   // Also checks that certain machines are slower with compressed oops
1452   // in vm_version initialization code.
1453 #endif // _LP64
1454 #endif // !ZERO
1455 }
1456 
1457 void Arguments::set_parallel_gc_flags() {
1458   assert(UseParallelGC || UseParallelOldGC, "Error");
1459   // If parallel old was requested, automatically enable parallel scavenge.
1460   if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1461     FLAG_SET_DEFAULT(UseParallelGC, true);
1462   }
1463 
1464   // If no heap maximum was requested explicitly, use some reasonable fraction
1465   // of the physical memory, up to a maximum of 1GB.
1466   if (UseParallelGC) {
1467     FLAG_SET_ERGO(uintx, ParallelGCThreads,
1468                   Abstract_VM_Version::parallel_worker_threads());
1469 
1470     // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1471     // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1472     // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1473     // See CR 6362902 for details.
1474     if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1475       if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1476          FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1477       }
1478       if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1479         FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1480       }
1481     }
1482 
1483     if (UseParallelOldGC) {
1484       // Par compact uses lower default values since they are treated as
1485       // minimums.  These are different defaults because of the different
1486       // interpretation and are not ergonomically set.
1487       if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1488         FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1489       }
1490       if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1491         FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1492       }
1493     }
1494   }
1495 }
1496 
1497 void Arguments::set_g1_gc_flags() {
1498   assert(UseG1GC, "Error");
1499 #ifdef COMPILER1
1500   FastTLABRefill = false;
1501 #endif
1502   FLAG_SET_DEFAULT(ParallelGCThreads,
1503                      Abstract_VM_Version::parallel_worker_threads());
1504   if (ParallelGCThreads == 0) {
1505     FLAG_SET_DEFAULT(ParallelGCThreads,
1506                      Abstract_VM_Version::parallel_worker_threads());
1507   }
1508   no_shared_spaces();
1509 
1510   if (FLAG_IS_DEFAULT(MarkStackSize)) {
1511     FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1512   }
1513   if (PrintGCDetails && Verbose) {
1514     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1515       MarkStackSize / K, MarkStackSizeMax / K);
1516     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1517   }
1518 
1519   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1520     // In G1, we want the default GC overhead goal to be higher than
1521     // say in PS. So we set it here to 10%. Otherwise the heap might
1522     // be expanded more aggressively than we would like it to. In
1523     // fact, even 10% seems to not be high enough in some cases
1524     // (especially small GC stress tests that the main thing they do
1525     // is allocation). We might consider increase it further.
1526     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1527   }
1528 }
1529 
1530 void Arguments::set_heap_size() {
1531   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1532     // Deprecated flag
1533     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1534   }
1535 
1536   const julong phys_mem =
1537     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1538                             : (julong)MaxRAM;
1539 
1540   // If the maximum heap size has not been set with -Xmx,
1541   // then set it as fraction of the size of physical memory,
1542   // respecting the maximum and minimum sizes of the heap.
1543   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1544     julong reasonable_max = phys_mem / MaxRAMFraction;
1545 
1546     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1547       // Small physical memory, so use a minimum fraction of it for the heap
1548       reasonable_max = phys_mem / MinRAMFraction;
1549     } else {
1550       // Not-small physical memory, so require a heap at least
1551       // as large as MaxHeapSize
1552       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1553     }
1554     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1555       // Limit the heap size to ErgoHeapSizeLimit
1556       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1557     }
1558     if (UseCompressedOops) {
1559       // Limit the heap size to the maximum possible when using compressed oops
1560       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1561       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1562         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1563         // but it should be not less than default MaxHeapSize.
1564         max_coop_heap -= HeapBaseMinAddress;
1565       }
1566       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1567     }
1568     reasonable_max = os::allocatable_physical_memory(reasonable_max);
1569 
1570     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1571       // An initial heap size was specified on the command line,
1572       // so be sure that the maximum size is consistent.  Done
1573       // after call to allocatable_physical_memory because that
1574       // method might reduce the allocation size.
1575       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1576     }
1577 
1578     if (PrintGCDetails && Verbose) {
1579       // Cannot use gclog_or_tty yet.
1580       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
1581     }
1582     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1583   }
1584 
1585   // If the initial_heap_size has not been set with InitialHeapSize
1586   // or -Xms, then set it as fraction of the size of physical memory,
1587   // respecting the maximum and minimum sizes of the heap.
1588   if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1589     julong reasonable_minimum = (julong)(OldSize + NewSize);
1590 
1591     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1592 
1593     reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1594 
1595     julong reasonable_initial = phys_mem / InitialRAMFraction;
1596 
1597     reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1598     reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1599 
1600     reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1601 
1602     if (PrintGCDetails && Verbose) {
1603       // Cannot use gclog_or_tty yet.
1604       tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1605       tty->print_cr("  Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1606     }
1607     FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1608     set_min_heap_size((uintx)reasonable_minimum);
1609   }
1610 }
1611 
1612 // This must be called after ergonomics because we want bytecode rewriting
1613 // if the server compiler is used, or if UseSharedSpaces is disabled.
1614 void Arguments::set_bytecode_flags() {
1615   // Better not attempt to store into a read-only space.
1616   if (UseSharedSpaces) {
1617     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1618     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1619   }
1620 
1621   if (!RewriteBytecodes) {
1622     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1623   }
1624 }
1625 
1626 // Aggressive optimization flags  -XX:+AggressiveOpts
1627 void Arguments::set_aggressive_opts_flags() {
1628 #ifdef COMPILER2
1629   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1630     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1631       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1632     }
1633     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1634       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1635     }
1636 
1637     // Feed the cache size setting into the JDK
1638     char buffer[1024];
1639     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1640     add_property(buffer);
1641   }
1642   if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1643     FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1644   }
1645   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1646     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1647   }
1648   if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1649     FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1650   }
1651   if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1652     FLAG_SET_DEFAULT(OptimizeFill, true);
1653   }
1654 #endif
1655 
1656   if (AggressiveOpts) {
1657 // Sample flag setting code
1658 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1659 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1660 //    }
1661   }
1662 }
1663 
1664 //===========================================================================================================
1665 // Parsing of java.compiler property
1666 
1667 void Arguments::process_java_compiler_argument(char* arg) {
1668   // For backwards compatibility, Djava.compiler=NONE or ""
1669   // causes us to switch to -Xint mode UNLESS -Xdebug
1670   // is also specified.
1671   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1672     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1673   }
1674 }
1675 
1676 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1677   _sun_java_launcher = strdup(launcher);
1678 }
1679 
1680 bool Arguments::created_by_java_launcher() {
1681   assert(_sun_java_launcher != NULL, "property must have value");
1682   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1683 }
1684 
1685 //===========================================================================================================
1686 // Parsing of main arguments
1687 
1688 bool Arguments::verify_interval(uintx val, uintx min,
1689                                 uintx max, const char* name) {
1690   // Returns true iff value is in the inclusive interval [min..max]
1691   // false, otherwise.
1692   if (val >= min && val <= max) {
1693     return true;
1694   }
1695   jio_fprintf(defaultStream::error_stream(),
1696               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1697               " and " UINTX_FORMAT "\n",
1698               name, val, min, max);
1699   return false;
1700 }
1701 
1702 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1703   // Returns true if given value is greater than specified min threshold
1704   // false, otherwise.
1705   if (val >= min ) {
1706       return true;
1707   }
1708   jio_fprintf(defaultStream::error_stream(),
1709               "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1710               name, val, min);
1711   return false;
1712 }
1713 
1714 bool Arguments::verify_percentage(uintx value, const char* name) {
1715   if (value <= 100) {
1716     return true;
1717   }
1718   jio_fprintf(defaultStream::error_stream(),
1719               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1720               name, value);
1721   return false;
1722 }
1723 
1724 static void force_serial_gc() {
1725   FLAG_SET_DEFAULT(UseSerialGC, true);
1726   FLAG_SET_DEFAULT(UseParNewGC, false);
1727   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1728   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
1729   FLAG_SET_DEFAULT(UseParallelGC, false);
1730   FLAG_SET_DEFAULT(UseParallelOldGC, false);
1731   FLAG_SET_DEFAULT(UseG1GC, false);
1732 }
1733 
1734 static bool verify_serial_gc_flags() {
1735   return (UseSerialGC &&
1736         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1737           UseParallelGC || UseParallelOldGC));
1738 }
1739 
1740 // Check consistency of GC selection
1741 bool Arguments::check_gc_consistency() {
1742   bool status = true;
1743   // Ensure that the user has not selected conflicting sets
1744   // of collectors. [Note: this check is merely a user convenience;
1745   // collectors over-ride each other so that only a non-conflicting
1746   // set is selected; however what the user gets is not what they
1747   // may have expected from the combination they asked for. It's
1748   // better to reduce user confusion by not allowing them to
1749   // select conflicting combinations.
1750   uint i = 0;
1751   if (UseSerialGC)                       i++;
1752   if (UseConcMarkSweepGC || UseParNewGC) i++;
1753   if (UseParallelGC || UseParallelOldGC) i++;
1754   if (UseG1GC)                           i++;
1755   if (i > 1) {
1756     jio_fprintf(defaultStream::error_stream(),
1757                 "Conflicting collector combinations in option list; "
1758                 "please refer to the release notes for the combinations "
1759                 "allowed\n");
1760     status = false;
1761   }
1762 
1763   return status;
1764 }
1765 
1766 // Check stack pages settings
1767 bool Arguments::check_stack_pages()
1768 {
1769   bool status = true;
1770   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1771   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1772   // greater stack shadow pages can't generate instruction to bang stack
1773   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1774   return status;
1775 }
1776 
1777 // Check the consistency of vm_init_args
1778 bool Arguments::check_vm_args_consistency() {
1779   // Method for adding checks for flag consistency.
1780   // The intent is to warn the user of all possible conflicts,
1781   // before returning an error.
1782   // Note: Needs platform-dependent factoring.
1783   bool status = true;
1784 
1785 #if ( (defined(COMPILER2) && defined(SPARC)))
1786   // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1787   // on sparc doesn't require generation of a stub as is the case on, e.g.,
1788   // x86.  Normally, VM_Version_init must be called from init_globals in
1789   // init.cpp, which is called by the initial java thread *after* arguments
1790   // have been parsed.  VM_Version_init gets called twice on sparc.
1791   extern void VM_Version_init();
1792   VM_Version_init();
1793   if (!VM_Version::has_v9()) {
1794     jio_fprintf(defaultStream::error_stream(),
1795                 "V8 Machine detected, Server requires V9\n");
1796     status = false;
1797   }
1798 #endif /* COMPILER2 && SPARC */
1799 
1800   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1801   // builds so the cost of stack banging can be measured.
1802 #if (defined(PRODUCT) && defined(SOLARIS))
1803   if (!UseBoundThreads && !UseStackBanging) {
1804     jio_fprintf(defaultStream::error_stream(),
1805                 "-UseStackBanging conflicts with -UseBoundThreads\n");
1806 
1807      status = false;
1808   }
1809 #endif
1810 
1811   if (TLABRefillWasteFraction == 0) {
1812     jio_fprintf(defaultStream::error_stream(),
1813                 "TLABRefillWasteFraction should be a denominator, "
1814                 "not " SIZE_FORMAT "\n",
1815                 TLABRefillWasteFraction);
1816     status = false;
1817   }
1818 
1819   status = status && verify_percentage(AdaptiveSizePolicyWeight,
1820                               "AdaptiveSizePolicyWeight");
1821   status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1822   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1823   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1824   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1825 
1826   if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1827     jio_fprintf(defaultStream::error_stream(),
1828                 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1829                 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1830                 MinHeapFreeRatio, MaxHeapFreeRatio);
1831     status = false;
1832   }
1833   // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1834   MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1835 
1836   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1837     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
1838   }
1839 
1840   if (UseParallelOldGC && ParallelOldGCSplitALot) {
1841     // Settings to encourage splitting.
1842     if (!FLAG_IS_CMDLINE(NewRatio)) {
1843       FLAG_SET_CMDLINE(intx, NewRatio, 2);
1844     }
1845     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1846       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1847     }
1848   }
1849 
1850   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1851   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1852   if (GCTimeLimit == 100) {
1853     // Turn off gc-overhead-limit-exceeded checks
1854     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1855   }
1856 
1857   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1858 
1859   // Check whether user-specified sharing option conflicts with GC or page size.
1860   // Both sharing and large pages are enabled by default on some platforms;
1861   // large pages override sharing only if explicitly set on the command line.
1862   const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1863           UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1864           UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1865   if (cannot_share) {
1866     // Either force sharing on by forcing the other options off, or
1867     // force sharing off.
1868     if (DumpSharedSpaces || ForceSharedSpaces) {
1869       jio_fprintf(defaultStream::error_stream(),
1870                   "Using Serial GC and default page size because of %s\n",
1871                   ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1872       force_serial_gc();
1873       FLAG_SET_DEFAULT(UseLargePages, false);
1874     } else {
1875       if (UseSharedSpaces && Verbose) {
1876         jio_fprintf(defaultStream::error_stream(),
1877                     "Turning off use of shared archive because of "
1878                     "choice of garbage collector or large pages\n");
1879       }
1880       no_shared_spaces();
1881     }
1882   } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1883     FLAG_SET_DEFAULT(UseLargePages, false);
1884   }
1885 
1886   status = status && check_gc_consistency();
1887   status = status && check_stack_pages();
1888 
1889   if (_has_alloc_profile) {
1890     if (UseParallelGC || UseParallelOldGC) {
1891       jio_fprintf(defaultStream::error_stream(),
1892                   "error:  invalid argument combination.\n"
1893                   "Allocation profiling (-Xaprof) cannot be used together with "
1894                   "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1895       status = false;
1896     }
1897     if (UseConcMarkSweepGC) {
1898       jio_fprintf(defaultStream::error_stream(),
1899                   "error:  invalid argument combination.\n"
1900                   "Allocation profiling (-Xaprof) cannot be used together with "
1901                   "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1902       status = false;
1903     }
1904   }
1905 
1906   if (CMSIncrementalMode) {
1907     if (!UseConcMarkSweepGC) {
1908       jio_fprintf(defaultStream::error_stream(),
1909                   "error:  invalid argument combination.\n"
1910                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1911                   "selected in order\nto use CMSIncrementalMode.\n");
1912       status = false;
1913     } else {
1914       status = status && verify_percentage(CMSIncrementalDutyCycle,
1915                                   "CMSIncrementalDutyCycle");
1916       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1917                                   "CMSIncrementalDutyCycleMin");
1918       status = status && verify_percentage(CMSIncrementalSafetyFactor,
1919                                   "CMSIncrementalSafetyFactor");
1920       status = status && verify_percentage(CMSIncrementalOffset,
1921                                   "CMSIncrementalOffset");
1922       status = status && verify_percentage(CMSExpAvgFactor,
1923                                   "CMSExpAvgFactor");
1924       // If it was not set on the command line, set
1925       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1926       if (CMSInitiatingOccupancyFraction < 0) {
1927         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1928       }
1929     }
1930   }
1931 
1932   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1933   // insists that we hold the requisite locks so that the iteration is
1934   // MT-safe. For the verification at start-up and shut-down, we don't
1935   // yet have a good way of acquiring and releasing these locks,
1936   // which are not visible at the CollectedHeap level. We want to
1937   // be able to acquire these locks and then do the iteration rather
1938   // than just disable the lock verification. This will be fixed under
1939   // bug 4788986.
1940   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1941     if (VerifyGCStartAt == 0) {
1942       warning("Heap verification at start-up disabled "
1943               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1944       VerifyGCStartAt = 1;      // Disable verification at start-up
1945     }
1946     if (VerifyBeforeExit) {
1947       warning("Heap verification at shutdown disabled "
1948               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1949       VerifyBeforeExit = false; // Disable verification at shutdown
1950     }
1951   }
1952 
1953   // Note: only executed in non-PRODUCT mode
1954   if (!UseAsyncConcMarkSweepGC &&
1955       (ExplicitGCInvokesConcurrent ||
1956        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1957     jio_fprintf(defaultStream::error_stream(),
1958                 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1959                 " with -UseAsyncConcMarkSweepGC");
1960     status = false;
1961   }
1962 
1963   if (UseG1GC) {
1964     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1965                                          "InitiatingHeapOccupancyPercent");
1966   }
1967 
1968   status = status && verify_interval(RefDiscoveryPolicy,
1969                                      ReferenceProcessor::DiscoveryPolicyMin,
1970                                      ReferenceProcessor::DiscoveryPolicyMax,
1971                                      "RefDiscoveryPolicy");
1972 
1973   // Limit the lower bound of this flag to 1 as it is used in a division
1974   // expression.
1975   status = status && verify_interval(TLABWasteTargetPercent,
1976                                      1, 100, "TLABWasteTargetPercent");
1977 
1978   status = status && verify_object_alignment();
1979 
1980   return status;
1981 }
1982 
1983 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1984   const char* option_type) {
1985   if (ignore) return false;
1986 
1987   const char* spacer = " ";
1988   if (option_type == NULL) {
1989     option_type = ++spacer; // Set both to the empty string.
1990   }
1991 
1992   if (os::obsolete_option(option)) {
1993     jio_fprintf(defaultStream::error_stream(),
1994                 "Obsolete %s%soption: %s\n", option_type, spacer,
1995       option->optionString);
1996     return false;
1997   } else {
1998     jio_fprintf(defaultStream::error_stream(),
1999                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2000       option->optionString);
2001     return true;
2002   }
2003 }
2004 
2005 static const char* user_assertion_options[] = {
2006   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2007 };
2008 
2009 static const char* system_assertion_options[] = {
2010   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2011 };
2012 
2013 // Return true if any of the strings in null-terminated array 'names' matches.
2014 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2015 // the option must match exactly.
2016 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2017   bool tail_allowed) {
2018   for (/* empty */; *names != NULL; ++names) {
2019     if (match_option(option, *names, tail)) {
2020       if (**tail == '\0' || tail_allowed && **tail == ':') {
2021         return true;
2022       }
2023     }
2024   }
2025   return false;
2026 }
2027 
2028 bool Arguments::parse_uintx(const char* value,
2029                             uintx* uintx_arg,
2030                             uintx min_size) {
2031 
2032   // Check the sign first since atomull() parses only unsigned values.
2033   bool value_is_positive = !(*value == '-');
2034 
2035   if (value_is_positive) {
2036     julong n;
2037     bool good_return = atomull(value, &n);
2038     if (good_return) {
2039       bool above_minimum = n >= min_size;
2040       bool value_is_too_large = n > max_uintx;
2041 
2042       if (above_minimum && !value_is_too_large) {
2043         *uintx_arg = n;
2044         return true;
2045       }
2046     }
2047   }
2048   return false;
2049 }
2050 
2051 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2052                                                   julong* long_arg,
2053                                                   julong min_size) {
2054   if (!atomull(s, long_arg)) return arg_unreadable;
2055   return check_memory_size(*long_arg, min_size);
2056 }
2057 
2058 // Parse JavaVMInitArgs structure
2059 
2060 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2061   // For components of the system classpath.
2062   SysClassPath scp(Arguments::get_sysclasspath());
2063   bool scp_assembly_required = false;
2064 
2065   // Save default settings for some mode flags
2066   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2067   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2068   Arguments::_ClipInlining             = ClipInlining;
2069   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2070 
2071   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2072   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2073   if (result != JNI_OK) {
2074     return result;
2075   }
2076 
2077   // Parse JavaVMInitArgs structure passed in
2078   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2079   if (result != JNI_OK) {
2080     return result;
2081   }
2082 
2083   if (AggressiveOpts) {
2084     // Insert alt-rt.jar between user-specified bootclasspath
2085     // prefix and the default bootclasspath.  os::set_boot_path()
2086     // uses meta_index_dir as the default bootclasspath directory.
2087     const char* altclasses_jar = "alt-rt.jar";
2088     size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2089                                  strlen(altclasses_jar);
2090     char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2091     strcpy(altclasses_path, get_meta_index_dir());
2092     strcat(altclasses_path, altclasses_jar);
2093     scp.add_suffix_to_prefix(altclasses_path);
2094     scp_assembly_required = true;
2095     FREE_C_HEAP_ARRAY(char, altclasses_path);
2096   }
2097 
2098   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2099   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2100   if (result != JNI_OK) {
2101     return result;
2102   }
2103 
2104   // Do final processing now that all arguments have been parsed
2105   result = finalize_vm_init_args(&scp, scp_assembly_required);
2106   if (result != JNI_OK) {
2107     return result;
2108   }
2109 
2110   return JNI_OK;
2111 }
2112 
2113 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2114                                        SysClassPath* scp_p,
2115                                        bool* scp_assembly_required_p,
2116                                        FlagValueOrigin origin) {
2117   // Remaining part of option string
2118   const char* tail;
2119 
2120   // iterate over arguments
2121   for (int index = 0; index < args->nOptions; index++) {
2122     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2123 
2124     const JavaVMOption* option = args->options + index;
2125 
2126     if (!match_option(option, "-Djava.class.path", &tail) &&
2127         !match_option(option, "-Dsun.java.command", &tail) &&
2128         !match_option(option, "-Dsun.java.launcher", &tail)) {
2129 
2130         // add all jvm options to the jvm_args string. This string
2131         // is used later to set the java.vm.args PerfData string constant.
2132         // the -Djava.class.path and the -Dsun.java.command options are
2133         // omitted from jvm_args string as each have their own PerfData
2134         // string constant object.
2135         build_jvm_args(option->optionString);
2136     }
2137 
2138     // -verbose:[class/gc/jni]
2139     if (match_option(option, "-verbose", &tail)) {
2140       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2141         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2142         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2143       } else if (!strcmp(tail, ":gc")) {
2144         FLAG_SET_CMDLINE(bool, PrintGC, true);
2145       } else if (!strcmp(tail, ":jni")) {
2146         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2147       }
2148     // -da / -ea / -disableassertions / -enableassertions
2149     // These accept an optional class/package name separated by a colon, e.g.,
2150     // -da:java.lang.Thread.
2151     } else if (match_option(option, user_assertion_options, &tail, true)) {
2152       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2153       if (*tail == '\0') {
2154         JavaAssertions::setUserClassDefault(enable);
2155       } else {
2156         assert(*tail == ':', "bogus match by match_option()");
2157         JavaAssertions::addOption(tail + 1, enable);
2158       }
2159     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2160     } else if (match_option(option, system_assertion_options, &tail, false)) {
2161       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2162       JavaAssertions::setSystemClassDefault(enable);
2163     // -bootclasspath:
2164     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2165       scp_p->reset_path(tail);
2166       *scp_assembly_required_p = true;
2167     // -bootclasspath/a:
2168     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2169       scp_p->add_suffix(tail);
2170       *scp_assembly_required_p = true;
2171     // -bootclasspath/p:
2172     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2173       scp_p->add_prefix(tail);
2174       *scp_assembly_required_p = true;
2175     // -Xrun
2176     } else if (match_option(option, "-Xrun", &tail)) {
2177       if (tail != NULL) {
2178         const char* pos = strchr(tail, ':');
2179         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2180         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2181         name[len] = '\0';
2182 
2183         char *options = NULL;
2184         if(pos != NULL) {
2185           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2186           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2187         }
2188 #ifdef JVMTI_KERNEL
2189         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2190           warning("profiling and debugging agents are not supported with Kernel VM");
2191         } else
2192 #endif // JVMTI_KERNEL
2193         add_init_library(name, options);
2194       }
2195     // -agentlib and -agentpath
2196     } else if (match_option(option, "-agentlib:", &tail) ||
2197           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2198       if(tail != NULL) {
2199         const char* pos = strchr(tail, '=');
2200         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2201         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2202         name[len] = '\0';
2203 
2204         char *options = NULL;
2205         if(pos != NULL) {
2206           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2207         }
2208 #ifdef JVMTI_KERNEL
2209         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2210           warning("profiling and debugging agents are not supported with Kernel VM");
2211         } else
2212 #endif // JVMTI_KERNEL
2213         add_init_agent(name, options, is_absolute_path);
2214 
2215       }
2216     // -javaagent
2217     } else if (match_option(option, "-javaagent:", &tail)) {
2218       if(tail != NULL) {
2219         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2220         add_init_agent("instrument", options, false);
2221       }
2222     // -Xnoclassgc
2223     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2224       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2225     // -Xincgc: i-CMS
2226     } else if (match_option(option, "-Xincgc", &tail)) {
2227       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2228       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2229     // -Xnoincgc: no i-CMS
2230     } else if (match_option(option, "-Xnoincgc", &tail)) {
2231       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2232       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2233     // -Xconcgc
2234     } else if (match_option(option, "-Xconcgc", &tail)) {
2235       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2236     // -Xnoconcgc
2237     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2238       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2239     // -Xbatch
2240     } else if (match_option(option, "-Xbatch", &tail)) {
2241       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2242     // -Xmn for compatibility with other JVM vendors
2243     } else if (match_option(option, "-Xmn", &tail)) {
2244       julong long_initial_eden_size = 0;
2245       ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2246       if (errcode != arg_in_range) {
2247         jio_fprintf(defaultStream::error_stream(),
2248                     "Invalid initial eden size: %s\n", option->optionString);
2249         describe_range_error(errcode);
2250         return JNI_EINVAL;
2251       }
2252       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2253       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2254     // -Xms
2255     } else if (match_option(option, "-Xms", &tail)) {
2256       julong long_initial_heap_size = 0;
2257       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2258       if (errcode != arg_in_range) {
2259         jio_fprintf(defaultStream::error_stream(),
2260                     "Invalid initial heap size: %s\n", option->optionString);
2261         describe_range_error(errcode);
2262         return JNI_EINVAL;
2263       }
2264       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2265       // Currently the minimum size and the initial heap sizes are the same.
2266       set_min_heap_size(InitialHeapSize);
2267     // -Xmx
2268     } else if (match_option(option, "-Xmx", &tail)) {
2269       julong long_max_heap_size = 0;
2270       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2271       if (errcode != arg_in_range) {
2272         jio_fprintf(defaultStream::error_stream(),
2273                     "Invalid maximum heap size: %s\n", option->optionString);
2274         describe_range_error(errcode);
2275         return JNI_EINVAL;
2276       }
2277       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2278     // Xmaxf
2279     } else if (match_option(option, "-Xmaxf", &tail)) {
2280       int maxf = (int)(atof(tail) * 100);
2281       if (maxf < 0 || maxf > 100) {
2282         jio_fprintf(defaultStream::error_stream(),
2283                     "Bad max heap free percentage size: %s\n",
2284                     option->optionString);
2285         return JNI_EINVAL;
2286       } else {
2287         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2288       }
2289     // Xminf
2290     } else if (match_option(option, "-Xminf", &tail)) {
2291       int minf = (int)(atof(tail) * 100);
2292       if (minf < 0 || minf > 100) {
2293         jio_fprintf(defaultStream::error_stream(),
2294                     "Bad min heap free percentage size: %s\n",
2295                     option->optionString);
2296         return JNI_EINVAL;
2297       } else {
2298         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2299       }
2300     // -Xss
2301     } else if (match_option(option, "-Xss", &tail)) {
2302       julong long_ThreadStackSize = 0;
2303       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2304       if (errcode != arg_in_range) {
2305         jio_fprintf(defaultStream::error_stream(),
2306                     "Invalid thread stack size: %s\n", option->optionString);
2307         describe_range_error(errcode);
2308         return JNI_EINVAL;
2309       }
2310       // Internally track ThreadStackSize in units of 1024 bytes.
2311       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2312                               round_to((int)long_ThreadStackSize, K) / K);
2313     // -Xoss
2314     } else if (match_option(option, "-Xoss", &tail)) {
2315           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2316     // -Xmaxjitcodesize
2317     } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
2318       julong long_ReservedCodeCacheSize = 0;
2319       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2320                                             (size_t)InitialCodeCacheSize);
2321       if (errcode != arg_in_range) {
2322         jio_fprintf(defaultStream::error_stream(),
2323                     "Invalid maximum code cache size: %s\n",
2324                     option->optionString);
2325         describe_range_error(errcode);
2326         return JNI_EINVAL;
2327       }
2328       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2329     // -green
2330     } else if (match_option(option, "-green", &tail)) {
2331       jio_fprintf(defaultStream::error_stream(),
2332                   "Green threads support not available\n");
2333           return JNI_EINVAL;
2334     // -native
2335     } else if (match_option(option, "-native", &tail)) {
2336           // HotSpot always uses native threads, ignore silently for compatibility
2337     // -Xsqnopause
2338     } else if (match_option(option, "-Xsqnopause", &tail)) {
2339           // EVM option, ignore silently for compatibility
2340     // -Xrs
2341     } else if (match_option(option, "-Xrs", &tail)) {
2342           // Classic/EVM option, new functionality
2343       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2344     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2345           // change default internal VM signals used - lower case for back compat
2346       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2347     // -Xoptimize
2348     } else if (match_option(option, "-Xoptimize", &tail)) {
2349           // EVM option, ignore silently for compatibility
2350     // -Xprof
2351     } else if (match_option(option, "-Xprof", &tail)) {
2352 #ifndef FPROF_KERNEL
2353       _has_profile = true;
2354 #else // FPROF_KERNEL
2355       // do we have to exit?
2356       warning("Kernel VM does not support flat profiling.");
2357 #endif // FPROF_KERNEL
2358     // -Xaprof
2359     } else if (match_option(option, "-Xaprof", &tail)) {
2360       _has_alloc_profile = true;
2361     // -Xconcurrentio
2362     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2363       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2364       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2365       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2366       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2367       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2368 
2369       // -Xinternalversion
2370     } else if (match_option(option, "-Xinternalversion", &tail)) {
2371       jio_fprintf(defaultStream::output_stream(), "%s\n",
2372                   VM_Version::internal_vm_info_string());
2373       vm_exit(0);
2374 #ifndef PRODUCT
2375     // -Xprintflags
2376     } else if (match_option(option, "-Xprintflags", &tail)) {
2377       CommandLineFlags::printFlags();
2378       vm_exit(0);
2379 #endif
2380     // -D
2381     } else if (match_option(option, "-D", &tail)) {
2382       if (!add_property(tail)) {
2383         return JNI_ENOMEM;
2384       }
2385       // Out of the box management support
2386       if (match_option(option, "-Dcom.sun.management", &tail)) {
2387         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2388       }
2389     // -Xint
2390     } else if (match_option(option, "-Xint", &tail)) {
2391           set_mode_flags(_int);
2392     // -Xmixed
2393     } else if (match_option(option, "-Xmixed", &tail)) {
2394           set_mode_flags(_mixed);
2395     // -Xcomp
2396     } else if (match_option(option, "-Xcomp", &tail)) {
2397       // for testing the compiler; turn off all flags that inhibit compilation
2398           set_mode_flags(_comp);
2399 
2400     // -Xshare:dump
2401     } else if (match_option(option, "-Xshare:dump", &tail)) {
2402 #ifdef TIERED
2403       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2404       set_mode_flags(_int);     // Prevent compilation, which creates objects
2405 #elif defined(COMPILER2)
2406       vm_exit_during_initialization(
2407           "Dumping a shared archive is not supported on the Server JVM.", NULL);
2408 #elif defined(KERNEL)
2409       vm_exit_during_initialization(
2410           "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2411 #else
2412       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2413       set_mode_flags(_int);     // Prevent compilation, which creates objects
2414 #endif
2415     // -Xshare:on
2416     } else if (match_option(option, "-Xshare:on", &tail)) {
2417       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2418       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2419 #ifdef TIERED
2420       FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2421 #endif // TIERED
2422     // -Xshare:auto
2423     } else if (match_option(option, "-Xshare:auto", &tail)) {
2424       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2425       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2426     // -Xshare:off
2427     } else if (match_option(option, "-Xshare:off", &tail)) {
2428       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2429       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2430 
2431     // -Xverify
2432     } else if (match_option(option, "-Xverify", &tail)) {
2433       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2434         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2435         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2436       } else if (strcmp(tail, ":remote") == 0) {
2437         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2438         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2439       } else if (strcmp(tail, ":none") == 0) {
2440         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2441         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2442       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2443         return JNI_EINVAL;
2444       }
2445     // -Xdebug
2446     } else if (match_option(option, "-Xdebug", &tail)) {
2447       // note this flag has been used, then ignore
2448       set_xdebug_mode(true);
2449     // -Xnoagent
2450     } else if (match_option(option, "-Xnoagent", &tail)) {
2451       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2452     } else if (match_option(option, "-Xboundthreads", &tail)) {
2453       // Bind user level threads to kernel threads (Solaris only)
2454       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2455     } else if (match_option(option, "-Xloggc:", &tail)) {
2456       // Redirect GC output to the file. -Xloggc:<filename>
2457       // ostream_init_log(), when called will use this filename
2458       // to initialize a fileStream.
2459       _gc_log_filename = strdup(tail);
2460       FLAG_SET_CMDLINE(bool, PrintGC, true);
2461       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2462       FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2463 
2464     // JNI hooks
2465     } else if (match_option(option, "-Xcheck", &tail)) {
2466       if (!strcmp(tail, ":jni")) {
2467         CheckJNICalls = true;
2468       } else if (is_bad_option(option, args->ignoreUnrecognized,
2469                                      "check")) {
2470         return JNI_EINVAL;
2471       }
2472     } else if (match_option(option, "vfprintf", &tail)) {
2473       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2474     } else if (match_option(option, "exit", &tail)) {
2475       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2476     } else if (match_option(option, "abort", &tail)) {
2477       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2478     // -XX:+AggressiveHeap
2479     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2480 
2481       // This option inspects the machine and attempts to set various
2482       // parameters to be optimal for long-running, memory allocation
2483       // intensive jobs.  It is intended for machines with large
2484       // amounts of cpu and memory.
2485 
2486       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2487       // VM, but we may not be able to represent the total physical memory
2488       // available (like having 8gb of memory on a box but using a 32bit VM).
2489       // Thus, we need to make sure we're using a julong for intermediate
2490       // calculations.
2491       julong initHeapSize;
2492       julong total_memory = os::physical_memory();
2493 
2494       if (total_memory < (julong)256*M) {
2495         jio_fprintf(defaultStream::error_stream(),
2496                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2497         vm_exit(1);
2498       }
2499 
2500       // The heap size is half of available memory, or (at most)
2501       // all of possible memory less 160mb (leaving room for the OS
2502       // when using ISM).  This is the maximum; because adaptive sizing
2503       // is turned on below, the actual space used may be smaller.
2504 
2505       initHeapSize = MIN2(total_memory / (julong)2,
2506                           total_memory - (julong)160*M);
2507 
2508       // Make sure that if we have a lot of memory we cap the 32 bit
2509       // process space.  The 64bit VM version of this function is a nop.
2510       initHeapSize = os::allocatable_physical_memory(initHeapSize);
2511 
2512       // The perm gen is separate but contiguous with the
2513       // object heap (and is reserved with it) so subtract it
2514       // from the heap size.
2515       if (initHeapSize > MaxPermSize) {
2516         initHeapSize = initHeapSize - MaxPermSize;
2517       } else {
2518         warning("AggressiveHeap and MaxPermSize values may conflict");
2519       }
2520 
2521       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2522          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2523          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2524          // Currently the minimum size and the initial heap sizes are the same.
2525          set_min_heap_size(initHeapSize);
2526       }
2527       if (FLAG_IS_DEFAULT(NewSize)) {
2528          // Make the young generation 3/8ths of the total heap.
2529          FLAG_SET_CMDLINE(uintx, NewSize,
2530                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2531          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2532       }
2533 
2534       FLAG_SET_DEFAULT(UseLargePages, true);
2535 
2536       // Increase some data structure sizes for efficiency
2537       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2538       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2539       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2540 
2541       // See the OldPLABSize comment below, but replace 'after promotion'
2542       // with 'after copying'.  YoungPLABSize is the size of the survivor
2543       // space per-gc-thread buffers.  The default is 4kw.
2544       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
2545 
2546       // OldPLABSize is the size of the buffers in the old gen that
2547       // UseParallelGC uses to promote live data that doesn't fit in the
2548       // survivor spaces.  At any given time, there's one for each gc thread.
2549       // The default size is 1kw. These buffers are rarely used, since the
2550       // survivor spaces are usually big enough.  For specjbb, however, there
2551       // are occasions when there's lots of live data in the young gen
2552       // and we end up promoting some of it.  We don't have a definite
2553       // explanation for why bumping OldPLABSize helps, but the theory
2554       // is that a bigger PLAB results in retaining something like the
2555       // original allocation order after promotion, which improves mutator
2556       // locality.  A minor effect may be that larger PLABs reduce the
2557       // number of PLAB allocation events during gc.  The value of 8kw
2558       // was arrived at by experimenting with specjbb.
2559       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
2560 
2561       // CompilationPolicyChoice=0 causes the server compiler to adopt
2562       // a more conservative which-method-do-I-compile policy when one
2563       // of the counters maintained by the interpreter trips.  The
2564       // result is reduced startup time and improved specjbb and
2565       // alacrity performance.  Zero is the default, but we set it
2566       // explicitly here in case the default changes.
2567       // See runtime/compilationPolicy.*.
2568       FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2569 
2570       // Enable parallel GC and adaptive generation sizing
2571       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2572       FLAG_SET_DEFAULT(ParallelGCThreads,
2573                        Abstract_VM_Version::parallel_worker_threads());
2574 
2575       // Encourage steady state memory management
2576       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2577 
2578       // This appears to improve mutator locality
2579       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2580 
2581       // Get around early Solaris scheduling bug
2582       // (affinity vs other jobs on system)
2583       // but disallow DR and offlining (5008695).
2584       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2585 
2586     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2587       // The last option must always win.
2588       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2589       FLAG_SET_CMDLINE(bool, NeverTenure, true);
2590     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2591       // The last option must always win.
2592       FLAG_SET_CMDLINE(bool, NeverTenure, false);
2593       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2594     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2595                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2596       jio_fprintf(defaultStream::error_stream(),
2597         "Please use CMSClassUnloadingEnabled in place of "
2598         "CMSPermGenSweepingEnabled in the future\n");
2599     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2600       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2601       jio_fprintf(defaultStream::error_stream(),
2602         "Please use -XX:+UseGCOverheadLimit in place of "
2603         "-XX:+UseGCTimeLimit in the future\n");
2604     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2605       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2606       jio_fprintf(defaultStream::error_stream(),
2607         "Please use -XX:-UseGCOverheadLimit in place of "
2608         "-XX:-UseGCTimeLimit in the future\n");
2609     // The TLE options are for compatibility with 1.3 and will be
2610     // removed without notice in a future release.  These options
2611     // are not to be documented.
2612     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2613       // No longer used.
2614     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2615       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2616     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2617       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2618     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2619       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2620     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2621       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2622     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2623       // No longer used.
2624     } else if (match_option(option, "-XX:TLESize=", &tail)) {
2625       julong long_tlab_size = 0;
2626       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2627       if (errcode != arg_in_range) {
2628         jio_fprintf(defaultStream::error_stream(),
2629                     "Invalid TLAB size: %s\n", option->optionString);
2630         describe_range_error(errcode);
2631         return JNI_EINVAL;
2632       }
2633       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2634     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2635       // No longer used.
2636     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2637       FLAG_SET_CMDLINE(bool, UseTLAB, true);
2638     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2639       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2640 SOLARIS_ONLY(
2641     } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2642       warning("-XX:+UsePermISM is obsolete.");
2643       FLAG_SET_CMDLINE(bool, UseISM, true);
2644     } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2645       FLAG_SET_CMDLINE(bool, UseISM, false);
2646 )
2647     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2648       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2649       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2650     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2651       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2652       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2653     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2654 #ifdef SOLARIS
2655       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2656       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2657       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2658       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2659 #else // ndef SOLARIS
2660       jio_fprintf(defaultStream::error_stream(),
2661                   "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2662       return JNI_EINVAL;
2663 #endif // ndef SOLARIS
2664 #ifdef ASSERT
2665     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2666       FLAG_SET_CMDLINE(bool, FullGCALot, true);
2667       // disable scavenge before parallel mark-compact
2668       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2669 #endif
2670     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2671       julong cms_blocks_to_claim = (julong)atol(tail);
2672       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2673       jio_fprintf(defaultStream::error_stream(),
2674         "Please use -XX:OldPLABSize in place of "
2675         "-XX:CMSParPromoteBlocksToClaim in the future\n");
2676     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2677       julong cms_blocks_to_claim = (julong)atol(tail);
2678       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2679       jio_fprintf(defaultStream::error_stream(),
2680         "Please use -XX:OldPLABSize in place of "
2681         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2682     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2683       julong old_plab_size = 0;
2684       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2685       if (errcode != arg_in_range) {
2686         jio_fprintf(defaultStream::error_stream(),
2687                     "Invalid old PLAB size: %s\n", option->optionString);
2688         describe_range_error(errcode);
2689         return JNI_EINVAL;
2690       }
2691       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2692       jio_fprintf(defaultStream::error_stream(),
2693                   "Please use -XX:OldPLABSize in place of "
2694                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2695     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2696       julong young_plab_size = 0;
2697       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2698       if (errcode != arg_in_range) {
2699         jio_fprintf(defaultStream::error_stream(),
2700                     "Invalid young PLAB size: %s\n", option->optionString);
2701         describe_range_error(errcode);
2702         return JNI_EINVAL;
2703       }
2704       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2705       jio_fprintf(defaultStream::error_stream(),
2706                   "Please use -XX:YoungPLABSize in place of "
2707                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2708     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2709                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2710       julong stack_size = 0;
2711       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2712       if (errcode != arg_in_range) {
2713         jio_fprintf(defaultStream::error_stream(),
2714                     "Invalid mark stack size: %s\n", option->optionString);
2715         describe_range_error(errcode);
2716         return JNI_EINVAL;
2717       }
2718       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2719     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2720       julong max_stack_size = 0;
2721       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2722       if (errcode != arg_in_range) {
2723         jio_fprintf(defaultStream::error_stream(),
2724                     "Invalid maximum mark stack size: %s\n",
2725                     option->optionString);
2726         describe_range_error(errcode);
2727         return JNI_EINVAL;
2728       }
2729       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2730     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2731                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2732       uintx conc_threads = 0;
2733       if (!parse_uintx(tail, &conc_threads, 1)) {
2734         jio_fprintf(defaultStream::error_stream(),
2735                     "Invalid concurrent threads: %s\n", option->optionString);
2736         return JNI_EINVAL;
2737       }
2738       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2739     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2740       // Skip -XX:Flags= since that case has already been handled
2741       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2742         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2743           return JNI_EINVAL;
2744         }
2745       }
2746     // Unknown option
2747     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2748       return JNI_ERR;
2749     }
2750   }
2751   // Change the default value for flags  which have different default values
2752   // when working with older JDKs.
2753   if (JDK_Version::current().compare_major(6) <= 0 &&
2754       FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2755     FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2756   }
2757 #ifdef LINUX
2758  if (JDK_Version::current().compare_major(6) <= 0 &&
2759       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2760     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2761   }
2762 #endif // LINUX
2763   return JNI_OK;
2764 }
2765 
2766 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2767   // This must be done after all -D arguments have been processed.
2768   scp_p->expand_endorsed();
2769 
2770   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2771     // Assemble the bootclasspath elements into the final path.
2772     Arguments::set_sysclasspath(scp_p->combined_path());
2773   }
2774 
2775   // This must be done after all arguments have been processed.
2776   // java_compiler() true means set to "NONE" or empty.
2777   if (java_compiler() && !xdebug_mode()) {
2778     // For backwards compatibility, we switch to interpreted mode if
2779     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2780     // not specified.
2781     set_mode_flags(_int);
2782   }
2783   if (CompileThreshold == 0) {
2784     set_mode_flags(_int);
2785   }
2786 
2787 #ifndef COMPILER2
2788   // Don't degrade server performance for footprint
2789   if (FLAG_IS_DEFAULT(UseLargePages) &&
2790       MaxHeapSize < LargePageHeapSizeThreshold) {
2791     // No need for large granularity pages w/small heaps.
2792     // Note that large pages are enabled/disabled for both the
2793     // Java heap and the code cache.
2794     FLAG_SET_DEFAULT(UseLargePages, false);
2795     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2796     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2797   }
2798 
2799   // Tiered compilation is undefined with C1.
2800   TieredCompilation = false;
2801 #else
2802   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2803     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2804   }
2805   // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2806   if (UseG1GC) {
2807     FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2808   }
2809 #endif
2810 
2811   // If we are running in a headless jre, force java.awt.headless property
2812   // to be true unless the property has already been set.
2813   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2814   if (os::is_headless_jre()) {
2815     const char* headless = Arguments::get_property("java.awt.headless");
2816     if (headless == NULL) {
2817       char envbuffer[128];
2818       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2819         if (!add_property("java.awt.headless=true")) {
2820           return JNI_ENOMEM;
2821         }
2822       } else {
2823         char buffer[256];
2824         strcpy(buffer, "java.awt.headless=");
2825         strcat(buffer, envbuffer);
2826         if (!add_property(buffer)) {
2827           return JNI_ENOMEM;
2828         }
2829       }
2830     }
2831   }
2832 
2833   if (!check_vm_args_consistency()) {
2834     return JNI_ERR;
2835   }
2836 
2837   return JNI_OK;
2838 }
2839 
2840 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2841   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2842                                             scp_assembly_required_p);
2843 }
2844 
2845 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2846   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2847                                             scp_assembly_required_p);
2848 }
2849 
2850 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2851   const int N_MAX_OPTIONS = 64;
2852   const int OPTION_BUFFER_SIZE = 1024;
2853   char buffer[OPTION_BUFFER_SIZE];
2854 
2855   // The variable will be ignored if it exceeds the length of the buffer.
2856   // Don't check this variable if user has special privileges
2857   // (e.g. unix su command).
2858   if (os::getenv(name, buffer, sizeof(buffer)) &&
2859       !os::have_special_privileges()) {
2860     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
2861     jio_fprintf(defaultStream::error_stream(),
2862                 "Picked up %s: %s\n", name, buffer);
2863     char* rd = buffer;                        // pointer to the input string (rd)
2864     int i;
2865     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
2866       while (isspace(*rd)) rd++;              // skip whitespace
2867       if (*rd == 0) break;                    // we re done when the input string is read completely
2868 
2869       // The output, option string, overwrites the input string.
2870       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2871       // input string (rd).
2872       char* wrt = rd;
2873 
2874       options[i++].optionString = wrt;        // Fill in option
2875       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
2876         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
2877           int quote = *rd;                    // matching quote to look for
2878           rd++;                               // don't copy open quote
2879           while (*rd != quote) {              // include everything (even spaces) up until quote
2880             if (*rd == 0) {                   // string termination means unmatched string
2881               jio_fprintf(defaultStream::error_stream(),
2882                           "Unmatched quote in %s\n", name);
2883               return JNI_ERR;
2884             }
2885             *wrt++ = *rd++;                   // copy to option string
2886           }
2887           rd++;                               // don't copy close quote
2888         } else {
2889           *wrt++ = *rd++;                     // copy to option string
2890         }
2891       }
2892       // Need to check if we're done before writing a NULL,
2893       // because the write could be to the byte that rd is pointing to.
2894       if (*rd++ == 0) {
2895         *wrt = 0;
2896         break;
2897       }
2898       *wrt = 0;                               // Zero terminate option
2899     }
2900     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2901     JavaVMInitArgs vm_args;
2902     vm_args.version = JNI_VERSION_1_2;
2903     vm_args.options = options;
2904     vm_args.nOptions = i;
2905     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2906 
2907     if (PrintVMOptions) {
2908       const char* tail;
2909       for (int i = 0; i < vm_args.nOptions; i++) {
2910         const JavaVMOption *option = vm_args.options + i;
2911         if (match_option(option, "-XX:", &tail)) {
2912           logOption(tail);
2913         }
2914       }
2915     }
2916 
2917     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2918   }
2919   return JNI_OK;
2920 }
2921 
2922 
2923 // Parse entry point called from JNI_CreateJavaVM
2924 
2925 jint Arguments::parse(const JavaVMInitArgs* args) {
2926 
2927   // Sharing support
2928   // Construct the path to the archive
2929   char jvm_path[JVM_MAXPATHLEN];
2930   os::jvm_path(jvm_path, sizeof(jvm_path));
2931 #ifdef TIERED
2932   if (strstr(jvm_path, "client") != NULL) {
2933     force_client_mode = true;
2934   }
2935 #endif // TIERED
2936   char *end = strrchr(jvm_path, *os::file_separator());
2937   if (end != NULL) *end = '\0';
2938   char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2939                                         strlen(os::file_separator()) + 20);
2940   if (shared_archive_path == NULL) return JNI_ENOMEM;
2941   strcpy(shared_archive_path, jvm_path);
2942   strcat(shared_archive_path, os::file_separator());
2943   strcat(shared_archive_path, "classes");
2944   DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2945   strcat(shared_archive_path, ".jsa");
2946   SharedArchivePath = shared_archive_path;
2947 
2948   // Remaining part of option string
2949   const char* tail;
2950 
2951   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2952   bool settings_file_specified = false;
2953   const char* flags_file;
2954   int index;
2955   for (index = 0; index < args->nOptions; index++) {
2956     const JavaVMOption *option = args->options + index;
2957     if (match_option(option, "-XX:Flags=", &tail)) {
2958       flags_file = tail;
2959       settings_file_specified = true;
2960     }
2961     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2962       PrintVMOptions = true;
2963     }
2964     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2965       PrintVMOptions = false;
2966     }
2967     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2968       IgnoreUnrecognizedVMOptions = true;
2969     }
2970     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2971       IgnoreUnrecognizedVMOptions = false;
2972     }
2973     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2974       CommandLineFlags::printFlags();
2975       vm_exit(0);
2976     }
2977 
2978 #ifndef PRODUCT
2979     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2980       CommandLineFlags::printFlags(true);
2981       vm_exit(0);
2982     }
2983 #endif
2984   }
2985 
2986   if (IgnoreUnrecognizedVMOptions) {
2987     // uncast const to modify the flag args->ignoreUnrecognized
2988     *(jboolean*)(&args->ignoreUnrecognized) = true;
2989   }
2990 
2991   // Parse specified settings file
2992   if (settings_file_specified) {
2993     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2994       return JNI_EINVAL;
2995     }
2996   }
2997 
2998   // Parse default .hotspotrc settings file
2999   if (!settings_file_specified) {
3000     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3001       return JNI_EINVAL;
3002     }
3003   }
3004 
3005   if (PrintVMOptions) {
3006     for (index = 0; index < args->nOptions; index++) {
3007       const JavaVMOption *option = args->options + index;
3008       if (match_option(option, "-XX:", &tail)) {
3009         logOption(tail);
3010       }
3011     }
3012   }
3013 
3014   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3015   jint result = parse_vm_init_args(args);
3016   if (result != JNI_OK) {
3017     return result;
3018   }
3019 
3020 #ifndef PRODUCT
3021   if (TraceBytecodesAt != 0) {
3022     TraceBytecodes = true;
3023   }
3024   if (CountCompiledCalls) {
3025     if (UseCounterDecay) {
3026       warning("UseCounterDecay disabled because CountCalls is set");
3027       UseCounterDecay = false;
3028     }
3029   }
3030 #endif // PRODUCT
3031 
3032   if (EnableInvokeDynamic && !EnableMethodHandles) {
3033     if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
3034       warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
3035     }
3036     EnableMethodHandles = true;
3037   }
3038   if (EnableMethodHandles && !AnonymousClasses) {
3039     if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
3040       warning("forcing AnonymousClasses true because EnableMethodHandles is true");
3041     }
3042     AnonymousClasses = true;
3043   }
3044   if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
3045     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3046       warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
3047     }
3048     ScavengeRootsInCode = 1;
3049   }
3050 #ifdef COMPILER2
3051   if (EnableInvokeDynamic && DoEscapeAnalysis) {
3052     // TODO: We need to find rules for invokedynamic and EA.  For now,
3053     // simply disable EA by default.
3054     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
3055       DoEscapeAnalysis = false;
3056     }
3057   }
3058 #endif
3059 
3060   if (PrintGCDetails) {
3061     // Turn on -verbose:gc options as well
3062     PrintGC = true;
3063   }
3064 
3065   // Set object alignment values.
3066   set_object_alignment();
3067 
3068 #ifdef SERIALGC
3069   force_serial_gc();
3070 #endif // SERIALGC
3071 #ifdef KERNEL
3072   no_shared_spaces();
3073 #endif // KERNEL
3074 
3075   // Set flags based on ergonomics.
3076   set_ergonomics_flags();
3077 
3078 #ifdef _LP64
3079   if (UseCompressedOops) {
3080     check_compressed_oops_compat();
3081   }
3082 #endif
3083 
3084   // Check the GC selections again.
3085   if (!check_gc_consistency()) {
3086     return JNI_EINVAL;
3087   }
3088 
3089   if (TieredCompilation) {
3090     set_tiered_flags();
3091   } else {
3092     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3093     if (CompilationPolicyChoice >= 2) {
3094       vm_exit_during_initialization(
3095         "Incompatible compilation policy selected", NULL);
3096     }
3097   }
3098 
3099 #ifndef KERNEL
3100   if (UseConcMarkSweepGC) {
3101     // Set flags for CMS and ParNew.  Check UseConcMarkSweep first
3102     // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3103     // are true, we don't call set_parnew_gc_flags() as well.
3104     set_cms_and_parnew_gc_flags();
3105   } else {
3106     // Set heap size based on available physical memory
3107     set_heap_size();
3108     // Set per-collector flags
3109     if (UseParallelGC || UseParallelOldGC) {
3110       set_parallel_gc_flags();
3111     } else if (UseParNewGC) {
3112       set_parnew_gc_flags();
3113     } else if (UseG1GC) {
3114       set_g1_gc_flags();
3115     }
3116   }
3117 #endif // KERNEL
3118 
3119 #ifdef SERIALGC
3120   assert(verify_serial_gc_flags(), "SerialGC unset");
3121 #endif // SERIALGC
3122 
3123   // Set bytecode rewriting flags
3124   set_bytecode_flags();
3125 
3126   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3127   set_aggressive_opts_flags();
3128 
3129 #ifdef CC_INTERP
3130   // Clear flags not supported by the C++ interpreter
3131   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3132   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3133   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3134 #endif // CC_INTERP
3135 
3136 #ifdef COMPILER2
3137   if (!UseBiasedLocking || EmitSync != 0) {
3138     UseOptoBiasInlining = false;
3139   }
3140 #endif
3141 
3142   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3143     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3144     DebugNonSafepoints = true;
3145   }
3146 
3147 #ifndef PRODUCT
3148   if (CompileTheWorld) {
3149     // Force NmethodSweeper to sweep whole CodeCache each time.
3150     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3151       NmethodSweepFraction = 1;
3152     }
3153   }
3154 #endif
3155 
3156   if (PrintCommandLineFlags) {
3157     CommandLineFlags::printSetFlags();
3158   }
3159 
3160   // Apply CPU specific policy for the BiasedLocking
3161   if (UseBiasedLocking) {
3162     if (!VM_Version::use_biased_locking() &&
3163         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3164       UseBiasedLocking = false;
3165     }
3166   }
3167 
3168   return JNI_OK;
3169 }
3170 
3171 int Arguments::PropertyList_count(SystemProperty* pl) {
3172   int count = 0;
3173   while(pl != NULL) {
3174     count++;
3175     pl = pl->next();
3176   }
3177   return count;
3178 }
3179 
3180 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3181   assert(key != NULL, "just checking");
3182   SystemProperty* prop;
3183   for (prop = pl; prop != NULL; prop = prop->next()) {
3184     if (strcmp(key, prop->key()) == 0) return prop->value();
3185   }
3186   return NULL;
3187 }
3188 
3189 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3190   int count = 0;
3191   const char* ret_val = NULL;
3192 
3193   while(pl != NULL) {
3194     if(count >= index) {
3195       ret_val = pl->key();
3196       break;
3197     }
3198     count++;
3199     pl = pl->next();
3200   }
3201 
3202   return ret_val;
3203 }
3204 
3205 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3206   int count = 0;
3207   char* ret_val = NULL;
3208 
3209   while(pl != NULL) {
3210     if(count >= index) {
3211       ret_val = pl->value();
3212       break;
3213     }
3214     count++;
3215     pl = pl->next();
3216   }
3217 
3218   return ret_val;
3219 }
3220 
3221 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3222   SystemProperty* p = *plist;
3223   if (p == NULL) {
3224     *plist = new_p;
3225   } else {
3226     while (p->next() != NULL) {
3227       p = p->next();
3228     }
3229     p->set_next(new_p);
3230   }
3231 }
3232 
3233 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3234   if (plist == NULL)
3235     return;
3236 
3237   SystemProperty* new_p = new SystemProperty(k, v, true);
3238   PropertyList_add(plist, new_p);
3239 }
3240 
3241 // This add maintains unique property key in the list.
3242 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3243   if (plist == NULL)
3244     return;
3245 
3246   // If property key exist then update with new value.
3247   SystemProperty* prop;
3248   for (prop = *plist; prop != NULL; prop = prop->next()) {
3249     if (strcmp(k, prop->key()) == 0) {
3250       if (append) {
3251         prop->append_value(v);
3252       } else {
3253         prop->set_value(v);
3254       }
3255       return;
3256     }
3257   }
3258 
3259   PropertyList_add(plist, k, v);
3260 }
3261 
3262 #ifdef KERNEL
3263 char *Arguments::get_kernel_properties() {
3264   // Find properties starting with kernel and append them to string
3265   // We need to find out how long they are first because the URL's that they
3266   // might point to could get long.
3267   int length = 0;
3268   SystemProperty* prop;
3269   for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3270     if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3271       length += (strlen(prop->key()) + strlen(prop->value()) + 5);  // "-D ="
3272     }
3273   }
3274   // Add one for null terminator.
3275   char *props = AllocateHeap(length + 1, "get_kernel_properties");
3276   if (length != 0) {
3277     int pos = 0;
3278     for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3279       if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3280         jio_snprintf(&props[pos], length-pos,
3281                      "-D%s=%s ", prop->key(), prop->value());
3282         pos = strlen(props);
3283       }
3284     }
3285   }
3286   // null terminate props in case of null
3287   props[length] = '\0';
3288   return props;
3289 }
3290 #endif // KERNEL
3291 
3292 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3293 // Returns true if all of the source pointed by src has been copied over to
3294 // the destination buffer pointed by buf. Otherwise, returns false.
3295 // Notes:
3296 // 1. If the length (buflen) of the destination buffer excluding the
3297 // NULL terminator character is not long enough for holding the expanded
3298 // pid characters, it also returns false instead of returning the partially
3299 // expanded one.
3300 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3301 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3302                                 char* buf, size_t buflen) {
3303   const char* p = src;
3304   char* b = buf;
3305   const char* src_end = &src[srclen];
3306   char* buf_end = &buf[buflen - 1];
3307 
3308   while (p < src_end && b < buf_end) {
3309     if (*p == '%') {
3310       switch (*(++p)) {
3311       case '%':         // "%%" ==> "%"
3312         *b++ = *p++;
3313         break;
3314       case 'p':  {       //  "%p" ==> current process id
3315         // buf_end points to the character before the last character so
3316         // that we could write '\0' to the end of the buffer.
3317         size_t buf_sz = buf_end - b + 1;
3318         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3319 
3320         // if jio_snprintf fails or the buffer is not long enough to hold
3321         // the expanded pid, returns false.
3322         if (ret < 0 || ret >= (int)buf_sz) {
3323           return false;
3324         } else {
3325           b += ret;
3326           assert(*b == '\0', "fail in copy_expand_pid");
3327           if (p == src_end && b == buf_end + 1) {
3328             // reach the end of the buffer.
3329             return true;
3330           }
3331         }
3332         p++;
3333         break;
3334       }
3335       default :
3336         *b++ = '%';
3337       }
3338     } else {
3339       *b++ = *p++;
3340     }
3341   }
3342   *b = '\0';
3343   return (p == src_end); // return false if not all of the source was copied
3344 }