1 /*
   2  * Copyright (c) 1997, 2012, 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_OS_FAMILY_linux
  41 # include "os_linux.inline.hpp"
  42 #endif
  43 #ifdef TARGET_OS_FAMILY_solaris
  44 # include "os_solaris.inline.hpp"
  45 #endif
  46 #ifdef TARGET_OS_FAMILY_windows
  47 # include "os_windows.inline.hpp"
  48 #endif
  49 #ifdef TARGET_OS_FAMILY_bsd
  50 # include "os_bsd.inline.hpp"
  51 #endif
  52 #ifndef SERIALGC
  53 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  54 #endif
  55 
  56 // Note: This is a special bug reporting site for the JVM
  57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
  58 #define DEFAULT_JAVA_LAUNCHER  "generic"
  59 
  60 char**  Arguments::_jvm_flags_array             = NULL;
  61 int     Arguments::_num_jvm_flags               = 0;
  62 char**  Arguments::_jvm_args_array              = NULL;
  63 int     Arguments::_num_jvm_args                = 0;
  64 char*  Arguments::_java_command                 = NULL;
  65 SystemProperty* Arguments::_system_properties   = NULL;
  66 const char*  Arguments::_gc_log_filename        = NULL;
  67 bool   Arguments::_has_profile                  = false;
  68 bool   Arguments::_has_alloc_profile            = false;
  69 uintx  Arguments::_min_heap_size                = 0;
  70 Arguments::Mode Arguments::_mode                = _mixed;
  71 bool   Arguments::_java_compiler                = false;
  72 bool   Arguments::_xdebug_mode                  = false;
  73 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  74 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  75 int    Arguments::_sun_java_launcher_pid        = -1;
  76 bool   Arguments::_created_by_gamma_launcher    = false;
  77 
  78 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
  79 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  80 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  81 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  82 bool   Arguments::_ClipInlining                 = ClipInlining;
  83 
  84 char*  Arguments::SharedArchivePath             = NULL;
  85 
  86 AgentLibraryList Arguments::_libraryList;
  87 AgentLibraryList Arguments::_agentList;
  88 
  89 abort_hook_t     Arguments::_abort_hook         = NULL;
  90 exit_hook_t      Arguments::_exit_hook          = NULL;
  91 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
  92 
  93 
  94 SystemProperty *Arguments::_java_ext_dirs = NULL;
  95 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
  96 SystemProperty *Arguments::_sun_boot_library_path = NULL;
  97 SystemProperty *Arguments::_java_library_path = NULL;
  98 SystemProperty *Arguments::_java_home = NULL;
  99 SystemProperty *Arguments::_java_class_path = NULL;
 100 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 101 
 102 char* Arguments::_meta_index_path = NULL;
 103 char* Arguments::_meta_index_dir = NULL;
 104 
 105 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
 106 
 107 static bool match_option(const JavaVMOption *option, const char* name,
 108                          const char** tail) {
 109   int len = (int)strlen(name);
 110   if (strncmp(option->optionString, name, len) == 0) {
 111     *tail = option->optionString + len;
 112     return true;
 113   } else {
 114     return false;
 115   }
 116 }
 117 
 118 static void logOption(const char* opt) {
 119   if (PrintVMOptions) {
 120     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 121   }
 122 }
 123 
 124 // Process java launcher properties.
 125 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 126   // See if sun.java.launcher or sun.java.launcher.pid is defined.
 127   // Must do this before setting up other system properties,
 128   // as some of them may depend on launcher type.
 129   for (int index = 0; index < args->nOptions; index++) {
 130     const JavaVMOption* option = args->options + index;
 131     const char* tail;
 132 
 133     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 134       process_java_launcher_argument(tail, option->extraInfo);
 135       continue;
 136     }
 137     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 138       _sun_java_launcher_pid = atoi(tail);
 139       continue;
 140     }
 141   }
 142 }
 143 
 144 // Initialize system properties key and value.
 145 void Arguments::init_system_properties() {
 146 
 147   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 148                                                                  "Java Virtual Machine Specification",  false));
 149   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 150   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 151   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 152 
 153   // following are JVMTI agent writeable properties.
 154   // Properties values are set to NULL and they are
 155   // os specific they are initialized in os::init_system_properties_values().
 156   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 157   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 158   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 159   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 160   _java_home =  new SystemProperty("java.home", NULL,  true);
 161   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 162 
 163   _java_class_path = new SystemProperty("java.class.path", "",  true);
 164 
 165   // Add to System Property list.
 166   PropertyList_add(&_system_properties, _java_ext_dirs);
 167   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 168   PropertyList_add(&_system_properties, _sun_boot_library_path);
 169   PropertyList_add(&_system_properties, _java_library_path);
 170   PropertyList_add(&_system_properties, _java_home);
 171   PropertyList_add(&_system_properties, _java_class_path);
 172   PropertyList_add(&_system_properties, _sun_boot_class_path);
 173 
 174   // Set OS specific system properties values
 175   os::init_system_properties_values();
 176 }
 177 
 178 
 179   // Update/Initialize System properties after JDK version number is known
 180 void Arguments::init_version_specific_system_properties() {
 181   enum { bufsz = 16 };
 182   char buffer[bufsz];
 183   const char* spec_vendor = "Sun Microsystems Inc.";
 184   uint32_t spec_version = 0;
 185 
 186   if (JDK_Version::is_gte_jdk17x_version()) {
 187     spec_vendor = "Oracle Corporation";
 188     spec_version = JDK_Version::current().major_version();
 189   }
 190   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 191 
 192   PropertyList_add(&_system_properties,
 193       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 194   PropertyList_add(&_system_properties,
 195       new SystemProperty("java.vm.specification.version", buffer, false));
 196   PropertyList_add(&_system_properties,
 197       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 198 }
 199 
 200 /**
 201  * Provide a slightly more user-friendly way of eliminating -XX flags.
 202  * When a flag is eliminated, it can be added to this list in order to
 203  * continue accepting this flag on the command-line, while issuing a warning
 204  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 205  * limit, we flatly refuse to admit the existence of the flag.  This allows
 206  * a flag to die correctly over JDK releases using HSX.
 207  */
 208 typedef struct {
 209   const char* name;
 210   JDK_Version obsoleted_in; // when the flag went away
 211   JDK_Version accept_until; // which version to start denying the existence
 212 } ObsoleteFlag;
 213 
 214 static ObsoleteFlag obsolete_jvm_flags[] = {
 215   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 216   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 217   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 218   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 219   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 220   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 221   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 222   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 223   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 224   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 225   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 226   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 227   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 228   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 229   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 230   { "DefaultInitialRAMFraction",
 231                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 232   { "UseDepthFirstScavengeOrder",
 233                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 234   { "HandlePromotionFailure",
 235                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 236   { "MaxLiveObjectEvacuationRatio",
 237                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 238   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 239   { "UseParallelOldGCCompacting",
 240                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 241   { "UseParallelDensePrefixUpdate",
 242                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 243   { "UseParallelOldGCDensePrefix",
 244                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 245   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 246   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 247 #ifdef PRODUCT
 248   { "DesiredMethodLimit",
 249                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 250 #endif // PRODUCT
 251   { NULL, JDK_Version(0), JDK_Version(0) }
 252 };
 253 
 254 // Returns true if the flag is obsolete and fits into the range specified
 255 // for being ignored.  In the case that the flag is ignored, the 'version'
 256 // value is filled in with the version number when the flag became
 257 // obsolete so that that value can be displayed to the user.
 258 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 259   int i = 0;
 260   assert(version != NULL, "Must provide a version buffer");
 261   while (obsolete_jvm_flags[i].name != NULL) {
 262     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 263     // <flag>=xxx form
 264     // [-|+]<flag> form
 265     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 266         ((s[0] == '+' || s[0] == '-') &&
 267         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 268       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 269           *version = flag_status.obsoleted_in;
 270           return true;
 271       }
 272     }
 273     i++;
 274   }
 275   return false;
 276 }
 277 
 278 // Constructs the system class path (aka boot class path) from the following
 279 // components, in order:
 280 //
 281 //     prefix           // from -Xbootclasspath/p:...
 282 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 283 //     base             // from os::get_system_properties() or -Xbootclasspath=
 284 //     suffix           // from -Xbootclasspath/a:...
 285 //
 286 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 287 // directories are added to the sysclasspath just before the base.
 288 //
 289 // This could be AllStatic, but it isn't needed after argument processing is
 290 // complete.
 291 class SysClassPath: public StackObj {
 292 public:
 293   SysClassPath(const char* base);
 294   ~SysClassPath();
 295 
 296   inline void set_base(const char* base);
 297   inline void add_prefix(const char* prefix);
 298   inline void add_suffix_to_prefix(const char* suffix);
 299   inline void add_suffix(const char* suffix);
 300   inline void reset_path(const char* base);
 301 
 302   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 303   // property.  Must be called after all command-line arguments have been
 304   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 305   // combined_path().
 306   void expand_endorsed();
 307 
 308   inline const char* get_base()     const { return _items[_scp_base]; }
 309   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 310   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 311   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 312 
 313   // Combine all the components into a single c-heap-allocated string; caller
 314   // must free the string if/when no longer needed.
 315   char* combined_path();
 316 
 317 private:
 318   // Utility routines.
 319   static char* add_to_path(const char* path, const char* str, bool prepend);
 320   static char* add_jars_to_path(char* path, const char* directory);
 321 
 322   inline void reset_item_at(int index);
 323 
 324   // Array indices for the items that make up the sysclasspath.  All except the
 325   // base are allocated in the C heap and freed by this class.
 326   enum {
 327     _scp_prefix,        // from -Xbootclasspath/p:...
 328     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 329     _scp_base,          // the default sysclasspath
 330     _scp_suffix,        // from -Xbootclasspath/a:...
 331     _scp_nitems         // the number of items, must be last.
 332   };
 333 
 334   const char* _items[_scp_nitems];
 335   DEBUG_ONLY(bool _expansion_done;)
 336 };
 337 
 338 SysClassPath::SysClassPath(const char* base) {
 339   memset(_items, 0, sizeof(_items));
 340   _items[_scp_base] = base;
 341   DEBUG_ONLY(_expansion_done = false;)
 342 }
 343 
 344 SysClassPath::~SysClassPath() {
 345   // Free everything except the base.
 346   for (int i = 0; i < _scp_nitems; ++i) {
 347     if (i != _scp_base) reset_item_at(i);
 348   }
 349   DEBUG_ONLY(_expansion_done = false;)
 350 }
 351 
 352 inline void SysClassPath::set_base(const char* base) {
 353   _items[_scp_base] = base;
 354 }
 355 
 356 inline void SysClassPath::add_prefix(const char* prefix) {
 357   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 358 }
 359 
 360 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 361   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 362 }
 363 
 364 inline void SysClassPath::add_suffix(const char* suffix) {
 365   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 366 }
 367 
 368 inline void SysClassPath::reset_item_at(int index) {
 369   assert(index < _scp_nitems && index != _scp_base, "just checking");
 370   if (_items[index] != NULL) {
 371     FREE_C_HEAP_ARRAY(char, _items[index]);
 372     _items[index] = NULL;
 373   }
 374 }
 375 
 376 inline void SysClassPath::reset_path(const char* base) {
 377   // Clear the prefix and suffix.
 378   reset_item_at(_scp_prefix);
 379   reset_item_at(_scp_suffix);
 380   set_base(base);
 381 }
 382 
 383 //------------------------------------------------------------------------------
 384 
 385 void SysClassPath::expand_endorsed() {
 386   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 387 
 388   const char* path = Arguments::get_property("java.endorsed.dirs");
 389   if (path == NULL) {
 390     path = Arguments::get_endorsed_dir();
 391     assert(path != NULL, "no default for java.endorsed.dirs");
 392   }
 393 
 394   char* expanded_path = NULL;
 395   const char separator = *os::path_separator();
 396   const char* const end = path + strlen(path);
 397   while (path < end) {
 398     const char* tmp_end = strchr(path, separator);
 399     if (tmp_end == NULL) {
 400       expanded_path = add_jars_to_path(expanded_path, path);
 401       path = end;
 402     } else {
 403       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
 404       memcpy(dirpath, path, tmp_end - path);
 405       dirpath[tmp_end - path] = '\0';
 406       expanded_path = add_jars_to_path(expanded_path, dirpath);
 407       FREE_C_HEAP_ARRAY(char, dirpath);
 408       path = tmp_end + 1;
 409     }
 410   }
 411   _items[_scp_endorsed] = expanded_path;
 412   DEBUG_ONLY(_expansion_done = true;)
 413 }
 414 
 415 // Combine the bootclasspath elements, some of which may be null, into a single
 416 // c-heap-allocated string.
 417 char* SysClassPath::combined_path() {
 418   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 419   assert(_expansion_done, "must call expand_endorsed() first.");
 420 
 421   size_t lengths[_scp_nitems];
 422   size_t total_len = 0;
 423 
 424   const char separator = *os::path_separator();
 425 
 426   // Get the lengths.
 427   int i;
 428   for (i = 0; i < _scp_nitems; ++i) {
 429     if (_items[i] != NULL) {
 430       lengths[i] = strlen(_items[i]);
 431       // Include space for the separator char (or a NULL for the last item).
 432       total_len += lengths[i] + 1;
 433     }
 434   }
 435   assert(total_len > 0, "empty sysclasspath not allowed");
 436 
 437   // Copy the _items to a single string.
 438   char* cp = NEW_C_HEAP_ARRAY(char, total_len);
 439   char* cp_tmp = cp;
 440   for (i = 0; i < _scp_nitems; ++i) {
 441     if (_items[i] != NULL) {
 442       memcpy(cp_tmp, _items[i], lengths[i]);
 443       cp_tmp += lengths[i];
 444       *cp_tmp++ = separator;
 445     }
 446   }
 447   *--cp_tmp = '\0';     // Replace the extra separator.
 448   return cp;
 449 }
 450 
 451 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 452 char*
 453 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 454   char *cp;
 455 
 456   assert(str != NULL, "just checking");
 457   if (path == NULL) {
 458     size_t len = strlen(str) + 1;
 459     cp = NEW_C_HEAP_ARRAY(char, len);
 460     memcpy(cp, str, len);                       // copy the trailing null
 461   } else {
 462     const char separator = *os::path_separator();
 463     size_t old_len = strlen(path);
 464     size_t str_len = strlen(str);
 465     size_t len = old_len + str_len + 2;
 466 
 467     if (prepend) {
 468       cp = NEW_C_HEAP_ARRAY(char, len);
 469       char* cp_tmp = cp;
 470       memcpy(cp_tmp, str, str_len);
 471       cp_tmp += str_len;
 472       *cp_tmp = separator;
 473       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 474       FREE_C_HEAP_ARRAY(char, path);
 475     } else {
 476       cp = REALLOC_C_HEAP_ARRAY(char, path, len);
 477       char* cp_tmp = cp + old_len;
 478       *cp_tmp = separator;
 479       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 480     }
 481   }
 482   return cp;
 483 }
 484 
 485 // Scan the directory and append any jar or zip files found to path.
 486 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 487 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 488   DIR* dir = os::opendir(directory);
 489   if (dir == NULL) return path;
 490 
 491   char dir_sep[2] = { '\0', '\0' };
 492   size_t directory_len = strlen(directory);
 493   const char fileSep = *os::file_separator();
 494   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 495 
 496   /* Scan the directory for jars/zips, appending them to path. */
 497   struct dirent *entry;
 498   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
 499   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 500     const char* name = entry->d_name;
 501     const char* ext = name + strlen(name) - 4;
 502     bool isJarOrZip = ext > name &&
 503       (os::file_name_strcmp(ext, ".jar") == 0 ||
 504        os::file_name_strcmp(ext, ".zip") == 0);
 505     if (isJarOrZip) {
 506       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
 507       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 508       path = add_to_path(path, jarpath, false);
 509       FREE_C_HEAP_ARRAY(char, jarpath);
 510     }
 511   }
 512   FREE_C_HEAP_ARRAY(char, dbuf);
 513   os::closedir(dir);
 514   return path;
 515 }
 516 
 517 // Parses a memory size specification string.
 518 static bool atomull(const char *s, julong* result) {
 519   julong n = 0;
 520   int args_read = sscanf(s, os::julong_format_specifier(), &n);
 521   if (args_read != 1) {
 522     return false;
 523   }
 524   while (*s != '\0' && isdigit(*s)) {
 525     s++;
 526   }
 527   // 4705540: illegal if more characters are found after the first non-digit
 528   if (strlen(s) > 1) {
 529     return false;
 530   }
 531   switch (*s) {
 532     case 'T': case 't':
 533       *result = n * G * K;
 534       // Check for overflow.
 535       if (*result/((julong)G * K) != n) return false;
 536       return true;
 537     case 'G': case 'g':
 538       *result = n * G;
 539       if (*result/G != n) return false;
 540       return true;
 541     case 'M': case 'm':
 542       *result = n * M;
 543       if (*result/M != n) return false;
 544       return true;
 545     case 'K': case 'k':
 546       *result = n * K;
 547       if (*result/K != n) return false;
 548       return true;
 549     case '\0':
 550       *result = n;
 551       return true;
 552     default:
 553       return false;
 554   }
 555 }
 556 
 557 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 558   if (size < min_size) return arg_too_small;
 559   // Check that size will fit in a size_t (only relevant on 32-bit)
 560   if (size > max_uintx) return arg_too_big;
 561   return arg_in_range;
 562 }
 563 
 564 // Describe an argument out of range error
 565 void Arguments::describe_range_error(ArgsRange errcode) {
 566   switch(errcode) {
 567   case arg_too_big:
 568     jio_fprintf(defaultStream::error_stream(),
 569                 "The specified size exceeds the maximum "
 570                 "representable size.\n");
 571     break;
 572   case arg_too_small:
 573   case arg_unreadable:
 574   case arg_in_range:
 575     // do nothing for now
 576     break;
 577   default:
 578     ShouldNotReachHere();
 579   }
 580 }
 581 
 582 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
 583   return CommandLineFlags::boolAtPut(name, &value, origin);
 584 }
 585 
 586 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
 587   double v;
 588   if (sscanf(value, "%lf", &v) != 1) {
 589     return false;
 590   }
 591 
 592   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 593     return true;
 594   }
 595   return false;
 596 }
 597 
 598 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
 599   julong v;
 600   intx intx_v;
 601   bool is_neg = false;
 602   // Check the sign first since atomull() parses only unsigned values.
 603   if (*value == '-') {
 604     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 605       return false;
 606     }
 607     value++;
 608     is_neg = true;
 609   }
 610   if (!atomull(value, &v)) {
 611     return false;
 612   }
 613   intx_v = (intx) v;
 614   if (is_neg) {
 615     intx_v = -intx_v;
 616   }
 617   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 618     return true;
 619   }
 620   uintx uintx_v = (uintx) v;
 621   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 622     return true;
 623   }
 624   uint64_t uint64_t_v = (uint64_t) v;
 625   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 626     return true;
 627   }
 628   return false;
 629 }
 630 
 631 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
 632   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 633   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 634   FREE_C_HEAP_ARRAY(char, value);
 635   return true;
 636 }
 637 
 638 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
 639   const char* old_value = "";
 640   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 641   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 642   size_t new_len = strlen(new_value);
 643   const char* value;
 644   char* free_this_too = NULL;
 645   if (old_len == 0) {
 646     value = new_value;
 647   } else if (new_len == 0) {
 648     value = old_value;
 649   } else {
 650     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
 651     // each new setting adds another LINE to the switch:
 652     sprintf(buf, "%s\n%s", old_value, new_value);
 653     value = buf;
 654     free_this_too = buf;
 655   }
 656   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 657   // CommandLineFlags always returns a pointer that needs freeing.
 658   FREE_C_HEAP_ARRAY(char, value);
 659   if (free_this_too != NULL) {
 660     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 661     FREE_C_HEAP_ARRAY(char, free_this_too);
 662   }
 663   return true;
 664 }
 665 
 666 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
 667 
 668   // range of acceptable characters spelled out for portability reasons
 669 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 670 #define BUFLEN 255
 671   char name[BUFLEN+1];
 672   char dummy;
 673 
 674   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 675     return set_bool_flag(name, false, origin);
 676   }
 677   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 678     return set_bool_flag(name, true, origin);
 679   }
 680 
 681   char punct;
 682   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 683     const char* value = strchr(arg, '=') + 1;
 684     Flag* flag = Flag::find_flag(name, strlen(name));
 685     if (flag != NULL && flag->is_ccstr()) {
 686       if (flag->ccstr_accumulates()) {
 687         return append_to_string_flag(name, value, origin);
 688       } else {
 689         if (value[0] == '\0') {
 690           value = NULL;
 691         }
 692         return set_string_flag(name, value, origin);
 693       }
 694     }
 695   }
 696 
 697   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 698     const char* value = strchr(arg, '=') + 1;
 699     // -XX:Foo:=xxx will reset the string flag to the given value.
 700     if (value[0] == '\0') {
 701       value = NULL;
 702     }
 703     return set_string_flag(name, value, origin);
 704   }
 705 
 706 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 707 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 708 #define        NUMBER_RANGE    "[0123456789]"
 709   char value[BUFLEN + 1];
 710   char value2[BUFLEN + 1];
 711   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 712     // Looks like a floating-point number -- try again with more lenient format string
 713     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 714       return set_fp_numeric_flag(name, value, origin);
 715     }
 716   }
 717 
 718 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 719   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 720     return set_numeric_flag(name, value, origin);
 721   }
 722 
 723   return false;
 724 }
 725 
 726 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 727   assert(bldarray != NULL, "illegal argument");
 728 
 729   if (arg == NULL) {
 730     return;
 731   }
 732 
 733   int index = *count;
 734 
 735   // expand the array and add arg to the last element
 736   (*count)++;
 737   if (*bldarray == NULL) {
 738     *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
 739   } else {
 740     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
 741   }
 742   (*bldarray)[index] = strdup(arg);
 743 }
 744 
 745 void Arguments::build_jvm_args(const char* arg) {
 746   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 747 }
 748 
 749 void Arguments::build_jvm_flags(const char* arg) {
 750   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 751 }
 752 
 753 // utility function to return a string that concatenates all
 754 // strings in a given char** array
 755 const char* Arguments::build_resource_string(char** args, int count) {
 756   if (args == NULL || count == 0) {
 757     return NULL;
 758   }
 759   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 760   for (int i = 1; i < count; i++) {
 761     length += strlen(args[i]) + 1; // add 1 for a space
 762   }
 763   char* s = NEW_RESOURCE_ARRAY(char, length);
 764   strcpy(s, args[0]);
 765   for (int j = 1; j < count; j++) {
 766     strcat(s, " ");
 767     strcat(s, args[j]);
 768   }
 769   return (const char*) s;
 770 }
 771 
 772 void Arguments::print_on(outputStream* st) {
 773   st->print_cr("VM Arguments:");
 774   if (num_jvm_flags() > 0) {
 775     st->print("jvm_flags: "); print_jvm_flags_on(st);
 776   }
 777   if (num_jvm_args() > 0) {
 778     st->print("jvm_args: "); print_jvm_args_on(st);
 779   }
 780   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 781   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 782 }
 783 
 784 void Arguments::print_jvm_flags_on(outputStream* st) {
 785   if (_num_jvm_flags > 0) {
 786     for (int i=0; i < _num_jvm_flags; i++) {
 787       st->print("%s ", _jvm_flags_array[i]);
 788     }
 789     st->print_cr("");
 790   }
 791 }
 792 
 793 void Arguments::print_jvm_args_on(outputStream* st) {
 794   if (_num_jvm_args > 0) {
 795     for (int i=0; i < _num_jvm_args; i++) {
 796       st->print("%s ", _jvm_args_array[i]);
 797     }
 798     st->print_cr("");
 799   }
 800 }
 801 
 802 bool Arguments::process_argument(const char* arg,
 803     jboolean ignore_unrecognized, FlagValueOrigin origin) {
 804 
 805   JDK_Version since = JDK_Version();
 806 
 807   if (parse_argument(arg, origin) || ignore_unrecognized) {
 808     return true;
 809   }
 810 
 811   const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
 812   if (is_newly_obsolete(arg, &since)) {
 813     char version[256];
 814     since.to_string(version, sizeof(version));
 815     warning("ignoring option %s; support was removed in %s", argname, version);
 816     return true;
 817   }
 818 
 819   jio_fprintf(defaultStream::error_stream(),
 820               "Unrecognized VM option '%s'\n", argname);
 821   // allow for commandline "commenting out" options like -XX:#+Verbose
 822   return arg[0] == '#';
 823 }
 824 
 825 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 826   FILE* stream = fopen(file_name, "rb");
 827   if (stream == NULL) {
 828     if (should_exist) {
 829       jio_fprintf(defaultStream::error_stream(),
 830                   "Could not open settings file %s\n", file_name);
 831       return false;
 832     } else {
 833       return true;
 834     }
 835   }
 836 
 837   char token[1024];
 838   int  pos = 0;
 839 
 840   bool in_white_space = true;
 841   bool in_comment     = false;
 842   bool in_quote       = false;
 843   char quote_c        = 0;
 844   bool result         = true;
 845 
 846   int c = getc(stream);
 847   while(c != EOF) {
 848     if (in_white_space) {
 849       if (in_comment) {
 850         if (c == '\n') in_comment = false;
 851       } else {
 852         if (c == '#') in_comment = true;
 853         else if (!isspace(c)) {
 854           in_white_space = false;
 855           token[pos++] = c;
 856         }
 857       }
 858     } else {
 859       if (c == '\n' || (!in_quote && isspace(c))) {
 860         // token ends at newline, or at unquoted whitespace
 861         // this allows a way to include spaces in string-valued options
 862         token[pos] = '\0';
 863         logOption(token);
 864         result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
 865         build_jvm_flags(token);
 866         pos = 0;
 867         in_white_space = true;
 868         in_quote = false;
 869       } else if (!in_quote && (c == '\'' || c == '"')) {
 870         in_quote = true;
 871         quote_c = c;
 872       } else if (in_quote && (c == quote_c)) {
 873         in_quote = false;
 874       } else {
 875         token[pos++] = c;
 876       }
 877     }
 878     c = getc(stream);
 879   }
 880   if (pos > 0) {
 881     token[pos] = '\0';
 882     result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
 883     build_jvm_flags(token);
 884   }
 885   fclose(stream);
 886   return result;
 887 }
 888 
 889 //=============================================================================================================
 890 // Parsing of properties (-D)
 891 
 892 const char* Arguments::get_property(const char* key) {
 893   return PropertyList_get_value(system_properties(), key);
 894 }
 895 
 896 bool Arguments::add_property(const char* prop) {
 897   const char* eq = strchr(prop, '=');
 898   char* key;
 899   // ns must be static--its address may be stored in a SystemProperty object.
 900   const static char ns[1] = {0};
 901   char* value = (char *)ns;
 902 
 903   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
 904   key = AllocateHeap(key_len + 1, "add_property");
 905   strncpy(key, prop, key_len);
 906   key[key_len] = '\0';
 907 
 908   if (eq != NULL) {
 909     size_t value_len = strlen(prop) - key_len - 1;
 910     value = AllocateHeap(value_len + 1, "add_property");
 911     strncpy(value, &prop[key_len + 1], value_len + 1);
 912   }
 913 
 914   if (strcmp(key, "java.compiler") == 0) {
 915     process_java_compiler_argument(value);
 916     FreeHeap(key);
 917     if (eq != NULL) {
 918       FreeHeap(value);
 919     }
 920     return true;
 921   } else if (strcmp(key, "sun.java.command") == 0) {
 922     _java_command = value;
 923 
 924     // Record value in Arguments, but let it get passed to Java.
 925   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
 926     // launcher.pid property is private and is processed
 927     // in process_sun_java_launcher_properties();
 928     // the sun.java.launcher property is passed on to the java application
 929     FreeHeap(key);
 930     if (eq != NULL) {
 931       FreeHeap(value);
 932     }
 933     return true;
 934   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
 935     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
 936     // its value without going through the property list or making a Java call.
 937     _java_vendor_url_bug = value;
 938   } else if (strcmp(key, "sun.boot.library.path") == 0) {
 939     PropertyList_unique_add(&_system_properties, key, value, true);
 940     return true;
 941   }
 942   // Create new property and add at the end of the list
 943   PropertyList_unique_add(&_system_properties, key, value);
 944   return true;
 945 }
 946 
 947 //===========================================================================================================
 948 // Setting int/mixed/comp mode flags
 949 
 950 void Arguments::set_mode_flags(Mode mode) {
 951   // Set up default values for all flags.
 952   // If you add a flag to any of the branches below,
 953   // add a default value for it here.
 954   set_java_compiler(false);
 955   _mode                      = mode;
 956 
 957   // Ensure Agent_OnLoad has the correct initial values.
 958   // This may not be the final mode; mode may change later in onload phase.
 959   PropertyList_unique_add(&_system_properties, "java.vm.info",
 960                           (char*)VM_Version::vm_info_string(), false);
 961 
 962   UseInterpreter             = true;
 963   UseCompiler                = true;
 964   UseLoopCounter             = true;
 965 
 966 #ifndef ZERO
 967   // Turn these off for mixed and comp.  Leave them on for Zero.
 968   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
 969     UseFastAccessorMethods = (mode == _int);
 970   }
 971   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
 972     UseFastEmptyMethods = (mode == _int);
 973   }
 974 #endif
 975 
 976   // Default values may be platform/compiler dependent -
 977   // use the saved values
 978   ClipInlining               = Arguments::_ClipInlining;
 979   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
 980   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
 981   BackgroundCompilation      = Arguments::_BackgroundCompilation;
 982 
 983   // Change from defaults based on mode
 984   switch (mode) {
 985   default:
 986     ShouldNotReachHere();
 987     break;
 988   case _int:
 989     UseCompiler              = false;
 990     UseLoopCounter           = false;
 991     AlwaysCompileLoopMethods = false;
 992     UseOnStackReplacement    = false;
 993     break;
 994   case _mixed:
 995     // same as default
 996     break;
 997   case _comp:
 998     UseInterpreter           = false;
 999     BackgroundCompilation    = false;
1000     ClipInlining             = false;
1001     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1002     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1003     // compile a level 4 (C2) and then continue executing it.
1004     if (TieredCompilation) {
1005       Tier3InvokeNotifyFreqLog = 0;
1006       Tier4InvocationThreshold = 0;
1007     }
1008     break;
1009   }
1010 }
1011 
1012 // Conflict: required to use shared spaces (-Xshare:on), but
1013 // incompatible command line options were chosen.
1014 
1015 static void no_shared_spaces() {
1016   if (RequireSharedSpaces) {
1017     jio_fprintf(defaultStream::error_stream(),
1018       "Class data sharing is inconsistent with other specified options.\n");
1019     vm_exit_during_initialization("Unable to use shared archive.", NULL);
1020   } else {
1021     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1022   }
1023 }
1024 
1025 void Arguments::set_tiered_flags() {
1026   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1027   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1028     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1029   }
1030   if (CompilationPolicyChoice < 2) {
1031     vm_exit_during_initialization(
1032       "Incompatible compilation policy selected", NULL);
1033   }
1034   // Increase the code cache size - tiered compiles a lot more.
1035   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1036     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1037   }
1038 }
1039 
1040 #ifndef KERNEL
1041 static void disable_adaptive_size_policy(const char* collector_name) {
1042   if (UseAdaptiveSizePolicy) {
1043     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1044       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1045               collector_name);
1046     }
1047     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1048   }
1049 }
1050 
1051 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1052 // if it's not explictly set or unset. If the user has chosen
1053 // UseParNewGC and not explicitly set ParallelGCThreads we
1054 // set it, unless this is a single cpu machine.
1055 void Arguments::set_parnew_gc_flags() {
1056   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1057          "control point invariant");
1058   assert(UseParNewGC, "Error");
1059 
1060   // Turn off AdaptiveSizePolicy for parnew until it is complete.
1061   disable_adaptive_size_policy("UseParNewGC");
1062 
1063   if (ParallelGCThreads == 0) {
1064     FLAG_SET_DEFAULT(ParallelGCThreads,
1065                      Abstract_VM_Version::parallel_worker_threads());
1066     if (ParallelGCThreads == 1) {
1067       FLAG_SET_DEFAULT(UseParNewGC, false);
1068       FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1069     }
1070   }
1071   if (UseParNewGC) {
1072     // CDS doesn't work with ParNew yet
1073     no_shared_spaces();
1074 
1075     // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1076     // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1077     // we set them to 1024 and 1024.
1078     // See CR 6362902.
1079     if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1080       FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1081     }
1082     if (FLAG_IS_DEFAULT(OldPLABSize)) {
1083       FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1084     }
1085 
1086     // AlwaysTenure flag should make ParNew promote all at first collection.
1087     // See CR 6362902.
1088     if (AlwaysTenure) {
1089       FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1090     }
1091     // When using compressed oops, we use local overflow stacks,
1092     // rather than using a global overflow list chained through
1093     // the klass word of the object's pre-image.
1094     if (UseCompressedOops && !ParGCUseLocalOverflow) {
1095       if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1096         warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1097       }
1098       FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1099     }
1100     assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1101   }
1102 }
1103 
1104 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1105 // sparc/solaris for certain applications, but would gain from
1106 // further optimization and tuning efforts, and would almost
1107 // certainly gain from analysis of platform and environment.
1108 void Arguments::set_cms_and_parnew_gc_flags() {
1109   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1110   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1111 
1112   // If we are using CMS, we prefer to UseParNewGC,
1113   // unless explicitly forbidden.
1114   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1115     FLAG_SET_ERGO(bool, UseParNewGC, true);
1116   }
1117 
1118   // Turn off AdaptiveSizePolicy for CMS until it is complete.
1119   disable_adaptive_size_policy("UseConcMarkSweepGC");
1120 
1121   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1122   // as needed.
1123   if (UseParNewGC) {
1124     set_parnew_gc_flags();
1125   }
1126 
1127   // MaxHeapSize is aligned down in collectorPolicy
1128   size_t max_heap = align_size_down(MaxHeapSize,
1129                                     CardTableRS::ct_max_alignment_constraint());
1130 
1131   // Now make adjustments for CMS
1132   intx   tenuring_default = (intx)6;
1133   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1134 
1135   // Preferred young gen size for "short" pauses:
1136   // upper bound depends on # of threads and NewRatio.
1137   const uintx parallel_gc_threads =
1138     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1139   const size_t preferred_max_new_size_unaligned =
1140     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1141   size_t preferred_max_new_size =
1142     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1143 
1144   // Unless explicitly requested otherwise, size young gen
1145   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1146 
1147   // If either MaxNewSize or NewRatio is set on the command line,
1148   // assume the user is trying to set the size of the young gen.
1149   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1150 
1151     // Set MaxNewSize to our calculated preferred_max_new_size unless
1152     // NewSize was set on the command line and it is larger than
1153     // preferred_max_new_size.
1154     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1155       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1156     } else {
1157       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1158     }
1159     if (PrintGCDetails && Verbose) {
1160       // Too early to use gclog_or_tty
1161       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1162     }
1163 
1164     // Code along this path potentially sets NewSize and OldSize
1165 
1166     assert(max_heap >= InitialHeapSize, "Error");
1167     assert(max_heap >= NewSize, "Error");
1168 
1169     if (PrintGCDetails && Verbose) {
1170       // Too early to use gclog_or_tty
1171       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1172            " initial_heap_size:  " SIZE_FORMAT
1173            " max_heap: " SIZE_FORMAT,
1174            min_heap_size(), InitialHeapSize, max_heap);
1175     }
1176     size_t min_new = preferred_max_new_size;
1177     if (FLAG_IS_CMDLINE(NewSize)) {
1178       min_new = NewSize;
1179     }
1180     if (max_heap > min_new && min_heap_size() > min_new) {
1181       // Unless explicitly requested otherwise, make young gen
1182       // at least min_new, and at most preferred_max_new_size.
1183       if (FLAG_IS_DEFAULT(NewSize)) {
1184         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1185         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1186         if (PrintGCDetails && Verbose) {
1187           // Too early to use gclog_or_tty
1188           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1189         }
1190       }
1191       // Unless explicitly requested otherwise, size old gen
1192       // so it's NewRatio x of NewSize.
1193       if (FLAG_IS_DEFAULT(OldSize)) {
1194         if (max_heap > NewSize) {
1195           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1196           if (PrintGCDetails && Verbose) {
1197             // Too early to use gclog_or_tty
1198             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1199           }
1200         }
1201       }
1202     }
1203   }
1204   // Unless explicitly requested otherwise, definitely
1205   // promote all objects surviving "tenuring_default" scavenges.
1206   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1207       FLAG_IS_DEFAULT(SurvivorRatio)) {
1208     FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1209   }
1210   // If we decided above (or user explicitly requested)
1211   // `promote all' (via MaxTenuringThreshold := 0),
1212   // prefer minuscule survivor spaces so as not to waste
1213   // space for (non-existent) survivors
1214   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1215     FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1216   }
1217   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1218   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1219   // This is done in order to make ParNew+CMS configuration to work
1220   // with YoungPLABSize and OldPLABSize options.
1221   // See CR 6362902.
1222   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1223     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1224       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1225       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1226       // the value (either from the command line or ergonomics) of
1227       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1228       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1229     } else {
1230       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1231       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1232       // we'll let it to take precedence.
1233       jio_fprintf(defaultStream::error_stream(),
1234                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1235                   " options are specified for the CMS collector."
1236                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1237     }
1238   }
1239   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1240     // OldPLAB sizing manually turned off: Use a larger default setting,
1241     // unless it was manually specified. This is because a too-low value
1242     // will slow down scavenges.
1243     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1244       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1245     }
1246   }
1247   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1248   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1249   // If either of the static initialization defaults have changed, note this
1250   // modification.
1251   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1252     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1253   }
1254   if (PrintGCDetails && Verbose) {
1255     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1256       MarkStackSize / K, MarkStackSizeMax / K);
1257     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1258   }
1259 }
1260 #endif // KERNEL
1261 
1262 void set_object_alignment() {
1263   // Object alignment.
1264   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1265   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1266   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1267   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1268   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1269   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1270 
1271   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1272   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1273 
1274   // Oop encoding heap max
1275   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1276 
1277 #ifndef KERNEL
1278   // Set CMS global values
1279   CompactibleFreeListSpace::set_cms_values();
1280 #endif // KERNEL
1281 }
1282 
1283 bool verify_object_alignment() {
1284   // Object alignment.
1285   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1286     jio_fprintf(defaultStream::error_stream(),
1287                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1288                 (int)ObjectAlignmentInBytes);
1289     return false;
1290   }
1291   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1292     jio_fprintf(defaultStream::error_stream(),
1293                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1294                 (int)ObjectAlignmentInBytes, BytesPerLong);
1295     return false;
1296   }
1297   // It does not make sense to have big object alignment
1298   // since a space lost due to alignment will be greater
1299   // then a saved space from compressed oops.
1300   if ((int)ObjectAlignmentInBytes > 256) {
1301     jio_fprintf(defaultStream::error_stream(),
1302                 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1303                 (int)ObjectAlignmentInBytes);
1304     return false;
1305   }
1306   // In case page size is very small.
1307   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1308     jio_fprintf(defaultStream::error_stream(),
1309                 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1310                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1311     return false;
1312   }
1313   return true;
1314 }
1315 
1316 inline uintx max_heap_for_compressed_oops() {
1317   // Avoid sign flip.
1318   if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1319     return 0;
1320   }
1321   LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1322   NOT_LP64(ShouldNotReachHere(); return 0);
1323 }
1324 
1325 bool Arguments::should_auto_select_low_pause_collector() {
1326   if (UseAutoGCSelectPolicy &&
1327       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1328       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1329     if (PrintGCDetails) {
1330       // Cannot use gclog_or_tty yet.
1331       tty->print_cr("Automatic selection of the low pause collector"
1332        " based on pause goal of %d (ms)", MaxGCPauseMillis);
1333     }
1334     return true;
1335   }
1336   return false;
1337 }
1338 
1339 void Arguments::set_ergonomics_flags() {
1340   // Parallel GC is not compatible with sharing. If one specifies
1341   // that they want sharing explicitly, do not set ergonomics flags.
1342   if (DumpSharedSpaces || RequireSharedSpaces) {
1343     return;
1344   }
1345 
1346   if (os::is_server_class_machine()) {
1347     // If no other collector is requested explicitly,
1348     // let the VM select the collector based on
1349     // machine class and automatic selection policy.
1350     if (!UseSerialGC &&
1351         !UseConcMarkSweepGC &&
1352         !UseG1GC &&
1353         !UseParNewGC &&
1354         !DumpSharedSpaces &&
1355         FLAG_IS_DEFAULT(UseParallelGC)) {
1356       if (should_auto_select_low_pause_collector()) {
1357         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1358       } else {
1359         FLAG_SET_ERGO(bool, UseParallelGC, true);
1360       }
1361       no_shared_spaces();
1362     }
1363   }
1364 
1365 #ifndef ZERO
1366 #ifdef _LP64
1367   // Check that UseCompressedOops can be set with the max heap size allocated
1368   // by ergonomics.
1369   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1370 #if !defined(COMPILER1) || defined(TIERED)
1371 // disable UseCompressedOops by default on MacOS X until 7118647 is fixed
1372 #ifndef __APPLE__
1373     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1374       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1375     }
1376 #endif // !__APPLE__
1377 #endif
1378 #ifdef _WIN64
1379     if (UseLargePages && UseCompressedOops) {
1380       // Cannot allocate guard pages for implicit checks in indexed addressing
1381       // mode, when large pages are specified on windows.
1382       // This flag could be switched ON if narrow oop base address is set to 0,
1383       // see code in Universe::initialize_heap().
1384       Universe::set_narrow_oop_use_implicit_null_checks(false);
1385     }
1386 #endif //  _WIN64
1387   } else {
1388     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1389       warning("Max heap size too large for Compressed Oops");
1390       FLAG_SET_DEFAULT(UseCompressedOops, false);
1391     }
1392   }
1393   // Also checks that certain machines are slower with compressed oops
1394   // in vm_version initialization code.
1395 #endif // _LP64
1396 #endif // !ZERO
1397 }
1398 
1399 void Arguments::set_parallel_gc_flags() {
1400   assert(UseParallelGC || UseParallelOldGC, "Error");
1401   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1402   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1403     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1404   }
1405   FLAG_SET_DEFAULT(UseParallelGC, true);
1406 
1407   // If no heap maximum was requested explicitly, use some reasonable fraction
1408   // of the physical memory, up to a maximum of 1GB.
1409   if (UseParallelGC) {
1410     FLAG_SET_DEFAULT(ParallelGCThreads,
1411                      Abstract_VM_Version::parallel_worker_threads());
1412 
1413     // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1414     // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1415     // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1416     // See CR 6362902 for details.
1417     if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1418       if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1419          FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1420       }
1421       if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1422         FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1423       }
1424     }
1425 
1426     if (UseParallelOldGC) {
1427       // Par compact uses lower default values since they are treated as
1428       // minimums.  These are different defaults because of the different
1429       // interpretation and are not ergonomically set.
1430       if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1431         FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1432       }
1433       if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1434         FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1435       }
1436     }
1437   }
1438   if (UseNUMA) {
1439     if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1440       FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1441     }
1442     // For those collectors or operating systems (eg, Windows) that do
1443     // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1444     UseNUMAInterleaving = true;
1445   }
1446 }
1447 
1448 void Arguments::set_g1_gc_flags() {
1449   assert(UseG1GC, "Error");
1450 #ifdef COMPILER1
1451   FastTLABRefill = false;
1452 #endif
1453   FLAG_SET_DEFAULT(ParallelGCThreads,
1454                      Abstract_VM_Version::parallel_worker_threads());
1455   if (ParallelGCThreads == 0) {
1456     FLAG_SET_DEFAULT(ParallelGCThreads,
1457                      Abstract_VM_Version::parallel_worker_threads());
1458   }
1459   no_shared_spaces();
1460 
1461   if (FLAG_IS_DEFAULT(MarkStackSize)) {
1462     FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1463   }
1464   if (PrintGCDetails && Verbose) {
1465     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1466       MarkStackSize / K, MarkStackSizeMax / K);
1467     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1468   }
1469 
1470   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1471     // In G1, we want the default GC overhead goal to be higher than
1472     // say in PS. So we set it here to 10%. Otherwise the heap might
1473     // be expanded more aggressively than we would like it to. In
1474     // fact, even 10% seems to not be high enough in some cases
1475     // (especially small GC stress tests that the main thing they do
1476     // is allocation). We might consider increase it further.
1477     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1478   }
1479 }
1480 
1481 void Arguments::set_heap_size() {
1482   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1483     // Deprecated flag
1484     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1485   }
1486 
1487   const julong phys_mem =
1488     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1489                             : (julong)MaxRAM;
1490 
1491   // If the maximum heap size has not been set with -Xmx,
1492   // then set it as fraction of the size of physical memory,
1493   // respecting the maximum and minimum sizes of the heap.
1494   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1495     julong reasonable_max = phys_mem / MaxRAMFraction;
1496 
1497     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1498       // Small physical memory, so use a minimum fraction of it for the heap
1499       reasonable_max = phys_mem / MinRAMFraction;
1500     } else {
1501       // Not-small physical memory, so require a heap at least
1502       // as large as MaxHeapSize
1503       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1504     }
1505     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1506       // Limit the heap size to ErgoHeapSizeLimit
1507       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1508     }
1509     if (UseCompressedOops) {
1510       // Limit the heap size to the maximum possible when using compressed oops
1511       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1512       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1513         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1514         // but it should be not less than default MaxHeapSize.
1515         max_coop_heap -= HeapBaseMinAddress;
1516       }
1517       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1518     }
1519     reasonable_max = os::allocatable_physical_memory(reasonable_max);
1520 
1521     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1522       // An initial heap size was specified on the command line,
1523       // so be sure that the maximum size is consistent.  Done
1524       // after call to allocatable_physical_memory because that
1525       // method might reduce the allocation size.
1526       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1527     }
1528 
1529     if (PrintGCDetails && Verbose) {
1530       // Cannot use gclog_or_tty yet.
1531       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
1532     }
1533     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1534   }
1535 
1536   // If the initial_heap_size has not been set with InitialHeapSize
1537   // or -Xms, then set it as fraction of the size of physical memory,
1538   // respecting the maximum and minimum sizes of the heap.
1539   if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1540     julong reasonable_minimum = (julong)(OldSize + NewSize);
1541 
1542     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1543 
1544     reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1545 
1546     julong reasonable_initial = phys_mem / InitialRAMFraction;
1547 
1548     reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1549     reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1550 
1551     reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1552 
1553     if (PrintGCDetails && Verbose) {
1554       // Cannot use gclog_or_tty yet.
1555       tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1556       tty->print_cr("  Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1557     }
1558     FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1559     set_min_heap_size((uintx)reasonable_minimum);
1560   }
1561 }
1562 
1563 // This must be called after ergonomics because we want bytecode rewriting
1564 // if the server compiler is used, or if UseSharedSpaces is disabled.
1565 void Arguments::set_bytecode_flags() {
1566   // Better not attempt to store into a read-only space.
1567   if (UseSharedSpaces) {
1568     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1569     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1570   }
1571 
1572   if (!RewriteBytecodes) {
1573     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1574   }
1575 }
1576 
1577 // Aggressive optimization flags  -XX:+AggressiveOpts
1578 void Arguments::set_aggressive_opts_flags() {
1579 #ifdef COMPILER2
1580   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1581     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1582       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1583     }
1584     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1585       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1586     }
1587 
1588     // Feed the cache size setting into the JDK
1589     char buffer[1024];
1590     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1591     add_property(buffer);
1592   }
1593   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1594     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1595   }
1596 #endif
1597 
1598   if (AggressiveOpts) {
1599 // Sample flag setting code
1600 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1601 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1602 //    }
1603   }
1604 }
1605 
1606 //===========================================================================================================
1607 // Parsing of java.compiler property
1608 
1609 void Arguments::process_java_compiler_argument(char* arg) {
1610   // For backwards compatibility, Djava.compiler=NONE or ""
1611   // causes us to switch to -Xint mode UNLESS -Xdebug
1612   // is also specified.
1613   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1614     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1615   }
1616 }
1617 
1618 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1619   _sun_java_launcher = strdup(launcher);
1620   if (strcmp("gamma", _sun_java_launcher) == 0) {
1621     _created_by_gamma_launcher = true;
1622   }
1623 }
1624 
1625 bool Arguments::created_by_java_launcher() {
1626   assert(_sun_java_launcher != NULL, "property must have value");
1627   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1628 }
1629 
1630 bool Arguments::created_by_gamma_launcher() {
1631   return _created_by_gamma_launcher;
1632 }
1633 
1634 //===========================================================================================================
1635 // Parsing of main arguments
1636 
1637 bool Arguments::verify_interval(uintx val, uintx min,
1638                                 uintx max, const char* name) {
1639   // Returns true iff value is in the inclusive interval [min..max]
1640   // false, otherwise.
1641   if (val >= min && val <= max) {
1642     return true;
1643   }
1644   jio_fprintf(defaultStream::error_stream(),
1645               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1646               " and " UINTX_FORMAT "\n",
1647               name, val, min, max);
1648   return false;
1649 }
1650 
1651 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1652   // Returns true if given value is at least specified min threshold
1653   // false, otherwise.
1654   if (val >= min ) {
1655       return true;
1656   }
1657   jio_fprintf(defaultStream::error_stream(),
1658               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1659               name, val, min);
1660   return false;
1661 }
1662 
1663 bool Arguments::verify_percentage(uintx value, const char* name) {
1664   if (value <= 100) {
1665     return true;
1666   }
1667   jio_fprintf(defaultStream::error_stream(),
1668               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1669               name, value);
1670   return false;
1671 }
1672 
1673 static void force_serial_gc() {
1674   FLAG_SET_DEFAULT(UseSerialGC, true);
1675   FLAG_SET_DEFAULT(UseParNewGC, false);
1676   FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1677   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
1678   FLAG_SET_DEFAULT(UseParallelGC, false);
1679   FLAG_SET_DEFAULT(UseParallelOldGC, false);
1680   FLAG_SET_DEFAULT(UseG1GC, false);
1681 }
1682 
1683 static bool verify_serial_gc_flags() {
1684   return (UseSerialGC &&
1685         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1686           UseParallelGC || UseParallelOldGC));
1687 }
1688 
1689 // check if do gclog rotation
1690 // +UseGCLogFileRotation is a must,
1691 // no gc log rotation when log file not supplied or
1692 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1693 void check_gclog_consistency() {
1694   if (UseGCLogFileRotation) {
1695     if ((Arguments::gc_log_filename() == NULL) ||
1696         (NumberOfGCLogFiles == 0)  ||
1697         (GCLogFileSize == 0)) {
1698       jio_fprintf(defaultStream::output_stream(),
1699                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1700                   "where num_of_file > 0 and num_of_size > 0\n"
1701                   "GC log rotation is turned off\n");
1702       UseGCLogFileRotation = false;
1703     }
1704   }
1705 
1706   if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1707         FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1708         jio_fprintf(defaultStream::output_stream(),
1709                     "GCLogFileSize changed to minimum 8K\n");
1710   }
1711 }
1712 
1713 // Check consistency of GC selection
1714 bool Arguments::check_gc_consistency() {
1715   check_gclog_consistency();
1716   bool status = true;
1717   // Ensure that the user has not selected conflicting sets
1718   // of collectors. [Note: this check is merely a user convenience;
1719   // collectors over-ride each other so that only a non-conflicting
1720   // set is selected; however what the user gets is not what they
1721   // may have expected from the combination they asked for. It's
1722   // better to reduce user confusion by not allowing them to
1723   // select conflicting combinations.
1724   uint i = 0;
1725   if (UseSerialGC)                       i++;
1726   if (UseConcMarkSweepGC || UseParNewGC) i++;
1727   if (UseParallelGC || UseParallelOldGC) i++;
1728   if (UseG1GC)                           i++;
1729   if (i > 1) {
1730     jio_fprintf(defaultStream::error_stream(),
1731                 "Conflicting collector combinations in option list; "
1732                 "please refer to the release notes for the combinations "
1733                 "allowed\n");
1734     status = false;
1735   }
1736 
1737   return status;
1738 }
1739 
1740 // Check stack pages settings
1741 bool Arguments::check_stack_pages()
1742 {
1743   bool status = true;
1744   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1745   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1746   // greater stack shadow pages can't generate instruction to bang stack
1747   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1748   return status;
1749 }
1750 
1751 // Check the consistency of vm_init_args
1752 bool Arguments::check_vm_args_consistency() {
1753   // Method for adding checks for flag consistency.
1754   // The intent is to warn the user of all possible conflicts,
1755   // before returning an error.
1756   // Note: Needs platform-dependent factoring.
1757   bool status = true;
1758 
1759 #if ( (defined(COMPILER2) && defined(SPARC)))
1760   // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1761   // on sparc doesn't require generation of a stub as is the case on, e.g.,
1762   // x86.  Normally, VM_Version_init must be called from init_globals in
1763   // init.cpp, which is called by the initial java thread *after* arguments
1764   // have been parsed.  VM_Version_init gets called twice on sparc.
1765   extern void VM_Version_init();
1766   VM_Version_init();
1767   if (!VM_Version::has_v9()) {
1768     jio_fprintf(defaultStream::error_stream(),
1769                 "V8 Machine detected, Server requires V9\n");
1770     status = false;
1771   }
1772 #endif /* COMPILER2 && SPARC */
1773 
1774   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1775   // builds so the cost of stack banging can be measured.
1776 #if (defined(PRODUCT) && defined(SOLARIS))
1777   if (!UseBoundThreads && !UseStackBanging) {
1778     jio_fprintf(defaultStream::error_stream(),
1779                 "-UseStackBanging conflicts with -UseBoundThreads\n");
1780 
1781      status = false;
1782   }
1783 #endif
1784 
1785   if (TLABRefillWasteFraction == 0) {
1786     jio_fprintf(defaultStream::error_stream(),
1787                 "TLABRefillWasteFraction should be a denominator, "
1788                 "not " SIZE_FORMAT "\n",
1789                 TLABRefillWasteFraction);
1790     status = false;
1791   }
1792 
1793   status = status && verify_percentage(AdaptiveSizePolicyWeight,
1794                               "AdaptiveSizePolicyWeight");
1795   status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1796   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1797   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1798   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1799 
1800   if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1801     jio_fprintf(defaultStream::error_stream(),
1802                 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1803                 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1804                 MinHeapFreeRatio, MaxHeapFreeRatio);
1805     status = false;
1806   }
1807   // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1808   MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1809 
1810   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1811     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
1812   }
1813 
1814   if (UseParallelOldGC && ParallelOldGCSplitALot) {
1815     // Settings to encourage splitting.
1816     if (!FLAG_IS_CMDLINE(NewRatio)) {
1817       FLAG_SET_CMDLINE(intx, NewRatio, 2);
1818     }
1819     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1820       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1821     }
1822   }
1823 
1824   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1825   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1826   if (GCTimeLimit == 100) {
1827     // Turn off gc-overhead-limit-exceeded checks
1828     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1829   }
1830 
1831   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1832 
1833   status = status && check_gc_consistency();
1834   status = status && check_stack_pages();
1835 
1836   if (_has_alloc_profile) {
1837     if (UseParallelGC || UseParallelOldGC) {
1838       jio_fprintf(defaultStream::error_stream(),
1839                   "error:  invalid argument combination.\n"
1840                   "Allocation profiling (-Xaprof) cannot be used together with "
1841                   "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1842       status = false;
1843     }
1844     if (UseConcMarkSweepGC) {
1845       jio_fprintf(defaultStream::error_stream(),
1846                   "error:  invalid argument combination.\n"
1847                   "Allocation profiling (-Xaprof) cannot be used together with "
1848                   "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1849       status = false;
1850     }
1851   }
1852 
1853   if (CMSIncrementalMode) {
1854     if (!UseConcMarkSweepGC) {
1855       jio_fprintf(defaultStream::error_stream(),
1856                   "error:  invalid argument combination.\n"
1857                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1858                   "selected in order\nto use CMSIncrementalMode.\n");
1859       status = false;
1860     } else {
1861       status = status && verify_percentage(CMSIncrementalDutyCycle,
1862                                   "CMSIncrementalDutyCycle");
1863       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1864                                   "CMSIncrementalDutyCycleMin");
1865       status = status && verify_percentage(CMSIncrementalSafetyFactor,
1866                                   "CMSIncrementalSafetyFactor");
1867       status = status && verify_percentage(CMSIncrementalOffset,
1868                                   "CMSIncrementalOffset");
1869       status = status && verify_percentage(CMSExpAvgFactor,
1870                                   "CMSExpAvgFactor");
1871       // If it was not set on the command line, set
1872       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1873       if (CMSInitiatingOccupancyFraction < 0) {
1874         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1875       }
1876     }
1877   }
1878 
1879   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1880   // insists that we hold the requisite locks so that the iteration is
1881   // MT-safe. For the verification at start-up and shut-down, we don't
1882   // yet have a good way of acquiring and releasing these locks,
1883   // which are not visible at the CollectedHeap level. We want to
1884   // be able to acquire these locks and then do the iteration rather
1885   // than just disable the lock verification. This will be fixed under
1886   // bug 4788986.
1887   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1888     if (VerifyGCStartAt == 0) {
1889       warning("Heap verification at start-up disabled "
1890               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1891       VerifyGCStartAt = 1;      // Disable verification at start-up
1892     }
1893     if (VerifyBeforeExit) {
1894       warning("Heap verification at shutdown disabled "
1895               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1896       VerifyBeforeExit = false; // Disable verification at shutdown
1897     }
1898   }
1899 
1900   // Note: only executed in non-PRODUCT mode
1901   if (!UseAsyncConcMarkSweepGC &&
1902       (ExplicitGCInvokesConcurrent ||
1903        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1904     jio_fprintf(defaultStream::error_stream(),
1905                 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1906                 " with -UseAsyncConcMarkSweepGC");
1907     status = false;
1908   }
1909 
1910   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1911 
1912 #ifndef SERIALGC
1913   if (UseG1GC) {
1914     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1915                                          "InitiatingHeapOccupancyPercent");
1916     status = status && verify_min_value(G1RefProcDrainInterval, 1,
1917                                         "G1RefProcDrainInterval");
1918     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1919                                         "G1ConcMarkStepDurationMillis");
1920   }
1921 #endif
1922 
1923   status = status && verify_interval(RefDiscoveryPolicy,
1924                                      ReferenceProcessor::DiscoveryPolicyMin,
1925                                      ReferenceProcessor::DiscoveryPolicyMax,
1926                                      "RefDiscoveryPolicy");
1927 
1928   // Limit the lower bound of this flag to 1 as it is used in a division
1929   // expression.
1930   status = status && verify_interval(TLABWasteTargetPercent,
1931                                      1, 100, "TLABWasteTargetPercent");
1932 
1933   status = status && verify_object_alignment();
1934 
1935   return status;
1936 }
1937 
1938 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1939   const char* option_type) {
1940   if (ignore) return false;
1941 
1942   const char* spacer = " ";
1943   if (option_type == NULL) {
1944     option_type = ++spacer; // Set both to the empty string.
1945   }
1946 
1947   if (os::obsolete_option(option)) {
1948     jio_fprintf(defaultStream::error_stream(),
1949                 "Obsolete %s%soption: %s\n", option_type, spacer,
1950       option->optionString);
1951     return false;
1952   } else {
1953     jio_fprintf(defaultStream::error_stream(),
1954                 "Unrecognized %s%soption: %s\n", option_type, spacer,
1955       option->optionString);
1956     return true;
1957   }
1958 }
1959 
1960 static const char* user_assertion_options[] = {
1961   "-da", "-ea", "-disableassertions", "-enableassertions", 0
1962 };
1963 
1964 static const char* system_assertion_options[] = {
1965   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1966 };
1967 
1968 // Return true if any of the strings in null-terminated array 'names' matches.
1969 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1970 // the option must match exactly.
1971 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1972   bool tail_allowed) {
1973   for (/* empty */; *names != NULL; ++names) {
1974     if (match_option(option, *names, tail)) {
1975       if (**tail == '\0' || tail_allowed && **tail == ':') {
1976         return true;
1977       }
1978     }
1979   }
1980   return false;
1981 }
1982 
1983 bool Arguments::parse_uintx(const char* value,
1984                             uintx* uintx_arg,
1985                             uintx min_size) {
1986 
1987   // Check the sign first since atomull() parses only unsigned values.
1988   bool value_is_positive = !(*value == '-');
1989 
1990   if (value_is_positive) {
1991     julong n;
1992     bool good_return = atomull(value, &n);
1993     if (good_return) {
1994       bool above_minimum = n >= min_size;
1995       bool value_is_too_large = n > max_uintx;
1996 
1997       if (above_minimum && !value_is_too_large) {
1998         *uintx_arg = n;
1999         return true;
2000       }
2001     }
2002   }
2003   return false;
2004 }
2005 
2006 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2007                                                   julong* long_arg,
2008                                                   julong min_size) {
2009   if (!atomull(s, long_arg)) return arg_unreadable;
2010   return check_memory_size(*long_arg, min_size);
2011 }
2012 
2013 // Parse JavaVMInitArgs structure
2014 
2015 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2016   // For components of the system classpath.
2017   SysClassPath scp(Arguments::get_sysclasspath());
2018   bool scp_assembly_required = false;
2019 
2020   // Save default settings for some mode flags
2021   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2022   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2023   Arguments::_ClipInlining             = ClipInlining;
2024   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2025 
2026   // Setup flags for mixed which is the default
2027   set_mode_flags(_mixed);
2028 
2029   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2030   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2031   if (result != JNI_OK) {
2032     return result;
2033   }
2034 
2035   // Parse JavaVMInitArgs structure passed in
2036   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2037   if (result != JNI_OK) {
2038     return result;
2039   }
2040 
2041   if (AggressiveOpts) {
2042     // Insert alt-rt.jar between user-specified bootclasspath
2043     // prefix and the default bootclasspath.  os::set_boot_path()
2044     // uses meta_index_dir as the default bootclasspath directory.
2045     const char* altclasses_jar = "alt-rt.jar";
2046     size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2047                                  strlen(altclasses_jar);
2048     char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2049     strcpy(altclasses_path, get_meta_index_dir());
2050     strcat(altclasses_path, altclasses_jar);
2051     scp.add_suffix_to_prefix(altclasses_path);
2052     scp_assembly_required = true;
2053     FREE_C_HEAP_ARRAY(char, altclasses_path);
2054   }
2055 
2056   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2057   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2058   if (result != JNI_OK) {
2059     return result;
2060   }
2061 
2062   // Do final processing now that all arguments have been parsed
2063   result = finalize_vm_init_args(&scp, scp_assembly_required);
2064   if (result != JNI_OK) {
2065     return result;
2066   }
2067 
2068   return JNI_OK;
2069 }
2070 
2071 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2072                                        SysClassPath* scp_p,
2073                                        bool* scp_assembly_required_p,
2074                                        FlagValueOrigin origin) {
2075   // Remaining part of option string
2076   const char* tail;
2077 
2078   // iterate over arguments
2079   for (int index = 0; index < args->nOptions; index++) {
2080     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2081 
2082     const JavaVMOption* option = args->options + index;
2083 
2084     if (!match_option(option, "-Djava.class.path", &tail) &&
2085         !match_option(option, "-Dsun.java.command", &tail) &&
2086         !match_option(option, "-Dsun.java.launcher", &tail)) {
2087 
2088         // add all jvm options to the jvm_args string. This string
2089         // is used later to set the java.vm.args PerfData string constant.
2090         // the -Djava.class.path and the -Dsun.java.command options are
2091         // omitted from jvm_args string as each have their own PerfData
2092         // string constant object.
2093         build_jvm_args(option->optionString);
2094     }
2095 
2096     // -verbose:[class/gc/jni]
2097     if (match_option(option, "-verbose", &tail)) {
2098       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2099         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2100         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2101       } else if (!strcmp(tail, ":gc")) {
2102         FLAG_SET_CMDLINE(bool, PrintGC, true);
2103       } else if (!strcmp(tail, ":jni")) {
2104         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2105       }
2106     // -da / -ea / -disableassertions / -enableassertions
2107     // These accept an optional class/package name separated by a colon, e.g.,
2108     // -da:java.lang.Thread.
2109     } else if (match_option(option, user_assertion_options, &tail, true)) {
2110       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2111       if (*tail == '\0') {
2112         JavaAssertions::setUserClassDefault(enable);
2113       } else {
2114         assert(*tail == ':', "bogus match by match_option()");
2115         JavaAssertions::addOption(tail + 1, enable);
2116       }
2117     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2118     } else if (match_option(option, system_assertion_options, &tail, false)) {
2119       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2120       JavaAssertions::setSystemClassDefault(enable);
2121     // -bootclasspath:
2122     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2123       scp_p->reset_path(tail);
2124       *scp_assembly_required_p = true;
2125     // -bootclasspath/a:
2126     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2127       scp_p->add_suffix(tail);
2128       *scp_assembly_required_p = true;
2129     // -bootclasspath/p:
2130     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2131       scp_p->add_prefix(tail);
2132       *scp_assembly_required_p = true;
2133     // -Xrun
2134     } else if (match_option(option, "-Xrun", &tail)) {
2135       if (tail != NULL) {
2136         const char* pos = strchr(tail, ':');
2137         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2138         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2139         name[len] = '\0';
2140 
2141         char *options = NULL;
2142         if(pos != NULL) {
2143           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2144           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2145         }
2146 #ifdef JVMTI_KERNEL
2147         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2148           warning("profiling and debugging agents are not supported with Kernel VM");
2149         } else
2150 #endif // JVMTI_KERNEL
2151         add_init_library(name, options);
2152       }
2153     // -agentlib and -agentpath
2154     } else if (match_option(option, "-agentlib:", &tail) ||
2155           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2156       if(tail != NULL) {
2157         const char* pos = strchr(tail, '=');
2158         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2159         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2160         name[len] = '\0';
2161 
2162         char *options = NULL;
2163         if(pos != NULL) {
2164           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2165         }
2166 #ifdef JVMTI_KERNEL
2167         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2168           warning("profiling and debugging agents are not supported with Kernel VM");
2169         } else
2170 #endif // JVMTI_KERNEL
2171         add_init_agent(name, options, is_absolute_path);
2172 
2173       }
2174     // -javaagent
2175     } else if (match_option(option, "-javaagent:", &tail)) {
2176       if(tail != NULL) {
2177         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2178         add_init_agent("instrument", options, false);
2179       }
2180     // -Xnoclassgc
2181     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2182       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2183     // -Xincgc: i-CMS
2184     } else if (match_option(option, "-Xincgc", &tail)) {
2185       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2186       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2187     // -Xnoincgc: no i-CMS
2188     } else if (match_option(option, "-Xnoincgc", &tail)) {
2189       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2190       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2191     // -Xconcgc
2192     } else if (match_option(option, "-Xconcgc", &tail)) {
2193       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2194     // -Xnoconcgc
2195     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2196       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2197     // -Xbatch
2198     } else if (match_option(option, "-Xbatch", &tail)) {
2199       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2200     // -Xmn for compatibility with other JVM vendors
2201     } else if (match_option(option, "-Xmn", &tail)) {
2202       julong long_initial_eden_size = 0;
2203       ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2204       if (errcode != arg_in_range) {
2205         jio_fprintf(defaultStream::error_stream(),
2206                     "Invalid initial eden size: %s\n", option->optionString);
2207         describe_range_error(errcode);
2208         return JNI_EINVAL;
2209       }
2210       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2211       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2212     // -Xms
2213     } else if (match_option(option, "-Xms", &tail)) {
2214       julong long_initial_heap_size = 0;
2215       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2216       if (errcode != arg_in_range) {
2217         jio_fprintf(defaultStream::error_stream(),
2218                     "Invalid initial heap size: %s\n", option->optionString);
2219         describe_range_error(errcode);
2220         return JNI_EINVAL;
2221       }
2222       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2223       // Currently the minimum size and the initial heap sizes are the same.
2224       set_min_heap_size(InitialHeapSize);
2225     // -Xmx
2226     } else if (match_option(option, "-Xmx", &tail)) {
2227       julong long_max_heap_size = 0;
2228       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2229       if (errcode != arg_in_range) {
2230         jio_fprintf(defaultStream::error_stream(),
2231                     "Invalid maximum heap size: %s\n", option->optionString);
2232         describe_range_error(errcode);
2233         return JNI_EINVAL;
2234       }
2235       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2236     // Xmaxf
2237     } else if (match_option(option, "-Xmaxf", &tail)) {
2238       int maxf = (int)(atof(tail) * 100);
2239       if (maxf < 0 || maxf > 100) {
2240         jio_fprintf(defaultStream::error_stream(),
2241                     "Bad max heap free percentage size: %s\n",
2242                     option->optionString);
2243         return JNI_EINVAL;
2244       } else {
2245         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2246       }
2247     // Xminf
2248     } else if (match_option(option, "-Xminf", &tail)) {
2249       int minf = (int)(atof(tail) * 100);
2250       if (minf < 0 || minf > 100) {
2251         jio_fprintf(defaultStream::error_stream(),
2252                     "Bad min heap free percentage size: %s\n",
2253                     option->optionString);
2254         return JNI_EINVAL;
2255       } else {
2256         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2257       }
2258     // -Xss
2259     } else if (match_option(option, "-Xss", &tail)) {
2260       julong long_ThreadStackSize = 0;
2261       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2262       if (errcode != arg_in_range) {
2263         jio_fprintf(defaultStream::error_stream(),
2264                     "Invalid thread stack size: %s\n", option->optionString);
2265         describe_range_error(errcode);
2266         return JNI_EINVAL;
2267       }
2268       // Internally track ThreadStackSize in units of 1024 bytes.
2269       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2270                               round_to((int)long_ThreadStackSize, K) / K);
2271     // -Xoss
2272     } else if (match_option(option, "-Xoss", &tail)) {
2273           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2274     // -Xmaxjitcodesize
2275     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2276                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2277       julong long_ReservedCodeCacheSize = 0;
2278       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2279                                             (size_t)InitialCodeCacheSize);
2280       if (errcode != arg_in_range) {
2281         jio_fprintf(defaultStream::error_stream(),
2282                     "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2283                     option->optionString, InitialCodeCacheSize/K);
2284         describe_range_error(errcode);
2285         return JNI_EINVAL;
2286       }
2287       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2288     // -green
2289     } else if (match_option(option, "-green", &tail)) {
2290       jio_fprintf(defaultStream::error_stream(),
2291                   "Green threads support not available\n");
2292           return JNI_EINVAL;
2293     // -native
2294     } else if (match_option(option, "-native", &tail)) {
2295           // HotSpot always uses native threads, ignore silently for compatibility
2296     // -Xsqnopause
2297     } else if (match_option(option, "-Xsqnopause", &tail)) {
2298           // EVM option, ignore silently for compatibility
2299     // -Xrs
2300     } else if (match_option(option, "-Xrs", &tail)) {
2301           // Classic/EVM option, new functionality
2302       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2303     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2304           // change default internal VM signals used - lower case for back compat
2305       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2306     // -Xoptimize
2307     } else if (match_option(option, "-Xoptimize", &tail)) {
2308           // EVM option, ignore silently for compatibility
2309     // -Xprof
2310     } else if (match_option(option, "-Xprof", &tail)) {
2311 #ifndef FPROF_KERNEL
2312       _has_profile = true;
2313 #else // FPROF_KERNEL
2314       // do we have to exit?
2315       warning("Kernel VM does not support flat profiling.");
2316 #endif // FPROF_KERNEL
2317     // -Xaprof
2318     } else if (match_option(option, "-Xaprof", &tail)) {
2319       _has_alloc_profile = true;
2320     // -Xconcurrentio
2321     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2322       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2323       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2324       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2325       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2326       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2327 
2328       // -Xinternalversion
2329     } else if (match_option(option, "-Xinternalversion", &tail)) {
2330       jio_fprintf(defaultStream::output_stream(), "%s\n",
2331                   VM_Version::internal_vm_info_string());
2332       vm_exit(0);
2333 #ifndef PRODUCT
2334     // -Xprintflags
2335     } else if (match_option(option, "-Xprintflags", &tail)) {
2336       CommandLineFlags::printFlags(tty, false);
2337       vm_exit(0);
2338 #endif
2339     // -D
2340     } else if (match_option(option, "-D", &tail)) {
2341       if (!add_property(tail)) {
2342         return JNI_ENOMEM;
2343       }
2344       // Out of the box management support
2345       if (match_option(option, "-Dcom.sun.management", &tail)) {
2346         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2347       }
2348     // -Xint
2349     } else if (match_option(option, "-Xint", &tail)) {
2350           set_mode_flags(_int);
2351     // -Xmixed
2352     } else if (match_option(option, "-Xmixed", &tail)) {
2353           set_mode_flags(_mixed);
2354     // -Xcomp
2355     } else if (match_option(option, "-Xcomp", &tail)) {
2356       // for testing the compiler; turn off all flags that inhibit compilation
2357           set_mode_flags(_comp);
2358 
2359     // -Xshare:dump
2360     } else if (match_option(option, "-Xshare:dump", &tail)) {
2361 #ifdef TIERED
2362       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2363       set_mode_flags(_int);     // Prevent compilation, which creates objects
2364 #elif defined(COMPILER2)
2365       vm_exit_during_initialization(
2366           "Dumping a shared archive is not supported on the Server JVM.", NULL);
2367 #elif defined(KERNEL)
2368       vm_exit_during_initialization(
2369           "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2370 #else
2371       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2372       set_mode_flags(_int);     // Prevent compilation, which creates objects
2373 #endif
2374     // -Xshare:on
2375     } else if (match_option(option, "-Xshare:on", &tail)) {
2376       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2377       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2378     // -Xshare:auto
2379     } else if (match_option(option, "-Xshare:auto", &tail)) {
2380       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2381       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2382     // -Xshare:off
2383     } else if (match_option(option, "-Xshare:off", &tail)) {
2384       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2385       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2386 
2387     // -Xverify
2388     } else if (match_option(option, "-Xverify", &tail)) {
2389       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2390         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2391         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2392       } else if (strcmp(tail, ":remote") == 0) {
2393         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2394         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2395       } else if (strcmp(tail, ":none") == 0) {
2396         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2397         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2398       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2399         return JNI_EINVAL;
2400       }
2401     // -Xdebug
2402     } else if (match_option(option, "-Xdebug", &tail)) {
2403       // note this flag has been used, then ignore
2404       set_xdebug_mode(true);
2405     // -Xnoagent
2406     } else if (match_option(option, "-Xnoagent", &tail)) {
2407       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2408     } else if (match_option(option, "-Xboundthreads", &tail)) {
2409       // Bind user level threads to kernel threads (Solaris only)
2410       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2411     } else if (match_option(option, "-Xloggc:", &tail)) {
2412       // Redirect GC output to the file. -Xloggc:<filename>
2413       // ostream_init_log(), when called will use this filename
2414       // to initialize a fileStream.
2415       _gc_log_filename = strdup(tail);
2416       FLAG_SET_CMDLINE(bool, PrintGC, true);
2417       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2418 
2419     // JNI hooks
2420     } else if (match_option(option, "-Xcheck", &tail)) {
2421       if (!strcmp(tail, ":jni")) {
2422         CheckJNICalls = true;
2423       } else if (is_bad_option(option, args->ignoreUnrecognized,
2424                                      "check")) {
2425         return JNI_EINVAL;
2426       }
2427     } else if (match_option(option, "vfprintf", &tail)) {
2428       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2429     } else if (match_option(option, "exit", &tail)) {
2430       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2431     } else if (match_option(option, "abort", &tail)) {
2432       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2433     // -XX:+AggressiveHeap
2434     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2435 
2436       // This option inspects the machine and attempts to set various
2437       // parameters to be optimal for long-running, memory allocation
2438       // intensive jobs.  It is intended for machines with large
2439       // amounts of cpu and memory.
2440 
2441       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2442       // VM, but we may not be able to represent the total physical memory
2443       // available (like having 8gb of memory on a box but using a 32bit VM).
2444       // Thus, we need to make sure we're using a julong for intermediate
2445       // calculations.
2446       julong initHeapSize;
2447       julong total_memory = os::physical_memory();
2448 
2449       if (total_memory < (julong)256*M) {
2450         jio_fprintf(defaultStream::error_stream(),
2451                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2452         vm_exit(1);
2453       }
2454 
2455       // The heap size is half of available memory, or (at most)
2456       // all of possible memory less 160mb (leaving room for the OS
2457       // when using ISM).  This is the maximum; because adaptive sizing
2458       // is turned on below, the actual space used may be smaller.
2459 
2460       initHeapSize = MIN2(total_memory / (julong)2,
2461                           total_memory - (julong)160*M);
2462 
2463       // Make sure that if we have a lot of memory we cap the 32 bit
2464       // process space.  The 64bit VM version of this function is a nop.
2465       initHeapSize = os::allocatable_physical_memory(initHeapSize);
2466 
2467       // The perm gen is separate but contiguous with the
2468       // object heap (and is reserved with it) so subtract it
2469       // from the heap size.
2470       if (initHeapSize > MaxPermSize) {
2471         initHeapSize = initHeapSize - MaxPermSize;
2472       } else {
2473         warning("AggressiveHeap and MaxPermSize values may conflict");
2474       }
2475 
2476       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2477          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2478          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2479          // Currently the minimum size and the initial heap sizes are the same.
2480          set_min_heap_size(initHeapSize);
2481       }
2482       if (FLAG_IS_DEFAULT(NewSize)) {
2483          // Make the young generation 3/8ths of the total heap.
2484          FLAG_SET_CMDLINE(uintx, NewSize,
2485                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2486          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2487       }
2488 
2489       FLAG_SET_DEFAULT(UseLargePages, true);
2490 
2491       // Increase some data structure sizes for efficiency
2492       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2493       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2494       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2495 
2496       // See the OldPLABSize comment below, but replace 'after promotion'
2497       // with 'after copying'.  YoungPLABSize is the size of the survivor
2498       // space per-gc-thread buffers.  The default is 4kw.
2499       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
2500 
2501       // OldPLABSize is the size of the buffers in the old gen that
2502       // UseParallelGC uses to promote live data that doesn't fit in the
2503       // survivor spaces.  At any given time, there's one for each gc thread.
2504       // The default size is 1kw. These buffers are rarely used, since the
2505       // survivor spaces are usually big enough.  For specjbb, however, there
2506       // are occasions when there's lots of live data in the young gen
2507       // and we end up promoting some of it.  We don't have a definite
2508       // explanation for why bumping OldPLABSize helps, but the theory
2509       // is that a bigger PLAB results in retaining something like the
2510       // original allocation order after promotion, which improves mutator
2511       // locality.  A minor effect may be that larger PLABs reduce the
2512       // number of PLAB allocation events during gc.  The value of 8kw
2513       // was arrived at by experimenting with specjbb.
2514       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
2515 
2516       // CompilationPolicyChoice=0 causes the server compiler to adopt
2517       // a more conservative which-method-do-I-compile policy when one
2518       // of the counters maintained by the interpreter trips.  The
2519       // result is reduced startup time and improved specjbb and
2520       // alacrity performance.  Zero is the default, but we set it
2521       // explicitly here in case the default changes.
2522       // See runtime/compilationPolicy.*.
2523       FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2524 
2525       // Enable parallel GC and adaptive generation sizing
2526       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2527       FLAG_SET_DEFAULT(ParallelGCThreads,
2528                        Abstract_VM_Version::parallel_worker_threads());
2529 
2530       // Encourage steady state memory management
2531       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2532 
2533       // This appears to improve mutator locality
2534       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2535 
2536       // Get around early Solaris scheduling bug
2537       // (affinity vs other jobs on system)
2538       // but disallow DR and offlining (5008695).
2539       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2540 
2541     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2542       // The last option must always win.
2543       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2544       FLAG_SET_CMDLINE(bool, NeverTenure, true);
2545     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2546       // The last option must always win.
2547       FLAG_SET_CMDLINE(bool, NeverTenure, false);
2548       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2549     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2550                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2551       jio_fprintf(defaultStream::error_stream(),
2552         "Please use CMSClassUnloadingEnabled in place of "
2553         "CMSPermGenSweepingEnabled in the future\n");
2554     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2555       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2556       jio_fprintf(defaultStream::error_stream(),
2557         "Please use -XX:+UseGCOverheadLimit in place of "
2558         "-XX:+UseGCTimeLimit in the future\n");
2559     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2560       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2561       jio_fprintf(defaultStream::error_stream(),
2562         "Please use -XX:-UseGCOverheadLimit in place of "
2563         "-XX:-UseGCTimeLimit in the future\n");
2564     // The TLE options are for compatibility with 1.3 and will be
2565     // removed without notice in a future release.  These options
2566     // are not to be documented.
2567     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2568       // No longer used.
2569     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2570       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2571     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2572       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2573     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2574       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2575     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2576       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2577     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2578       // No longer used.
2579     } else if (match_option(option, "-XX:TLESize=", &tail)) {
2580       julong long_tlab_size = 0;
2581       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2582       if (errcode != arg_in_range) {
2583         jio_fprintf(defaultStream::error_stream(),
2584                     "Invalid TLAB size: %s\n", option->optionString);
2585         describe_range_error(errcode);
2586         return JNI_EINVAL;
2587       }
2588       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2589     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2590       // No longer used.
2591     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2592       FLAG_SET_CMDLINE(bool, UseTLAB, true);
2593     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2594       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2595 SOLARIS_ONLY(
2596     } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2597       warning("-XX:+UsePermISM is obsolete.");
2598       FLAG_SET_CMDLINE(bool, UseISM, true);
2599     } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2600       FLAG_SET_CMDLINE(bool, UseISM, false);
2601 )
2602     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2603       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2604       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2605     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2606       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2607       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2608     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2609 #if defined(DTRACE_ENABLED)
2610       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2611       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2612       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2613       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2614 #else // defined(DTRACE_ENABLED)
2615       jio_fprintf(defaultStream::error_stream(),
2616                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2617       return JNI_EINVAL;
2618 #endif // defined(DTRACE_ENABLED)
2619 #ifdef ASSERT
2620     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2621       FLAG_SET_CMDLINE(bool, FullGCALot, true);
2622       // disable scavenge before parallel mark-compact
2623       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2624 #endif
2625     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2626       julong cms_blocks_to_claim = (julong)atol(tail);
2627       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2628       jio_fprintf(defaultStream::error_stream(),
2629         "Please use -XX:OldPLABSize in place of "
2630         "-XX:CMSParPromoteBlocksToClaim in the future\n");
2631     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2632       julong cms_blocks_to_claim = (julong)atol(tail);
2633       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2634       jio_fprintf(defaultStream::error_stream(),
2635         "Please use -XX:OldPLABSize in place of "
2636         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2637     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2638       julong old_plab_size = 0;
2639       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2640       if (errcode != arg_in_range) {
2641         jio_fprintf(defaultStream::error_stream(),
2642                     "Invalid old PLAB size: %s\n", option->optionString);
2643         describe_range_error(errcode);
2644         return JNI_EINVAL;
2645       }
2646       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2647       jio_fprintf(defaultStream::error_stream(),
2648                   "Please use -XX:OldPLABSize in place of "
2649                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2650     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2651       julong young_plab_size = 0;
2652       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2653       if (errcode != arg_in_range) {
2654         jio_fprintf(defaultStream::error_stream(),
2655                     "Invalid young PLAB size: %s\n", option->optionString);
2656         describe_range_error(errcode);
2657         return JNI_EINVAL;
2658       }
2659       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2660       jio_fprintf(defaultStream::error_stream(),
2661                   "Please use -XX:YoungPLABSize in place of "
2662                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2663     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2664                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2665       julong stack_size = 0;
2666       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2667       if (errcode != arg_in_range) {
2668         jio_fprintf(defaultStream::error_stream(),
2669                     "Invalid mark stack size: %s\n", option->optionString);
2670         describe_range_error(errcode);
2671         return JNI_EINVAL;
2672       }
2673       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2674     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2675       julong max_stack_size = 0;
2676       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2677       if (errcode != arg_in_range) {
2678         jio_fprintf(defaultStream::error_stream(),
2679                     "Invalid maximum mark stack size: %s\n",
2680                     option->optionString);
2681         describe_range_error(errcode);
2682         return JNI_EINVAL;
2683       }
2684       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2685     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2686                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2687       uintx conc_threads = 0;
2688       if (!parse_uintx(tail, &conc_threads, 1)) {
2689         jio_fprintf(defaultStream::error_stream(),
2690                     "Invalid concurrent threads: %s\n", option->optionString);
2691         return JNI_EINVAL;
2692       }
2693       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2694     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2695       // Skip -XX:Flags= since that case has already been handled
2696       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2697         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2698           return JNI_EINVAL;
2699         }
2700       }
2701     // Unknown option
2702     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2703       return JNI_ERR;
2704     }
2705   }
2706 
2707   // Change the default value for flags  which have different default values
2708   // when working with older JDKs.
2709   if (JDK_Version::current().compare_major(6) <= 0 &&
2710       FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2711     FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2712   }
2713 #ifdef LINUX
2714  if (JDK_Version::current().compare_major(6) <= 0 &&
2715       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2716     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2717   }
2718 #endif // LINUX
2719   return JNI_OK;
2720 }
2721 
2722 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2723   // This must be done after all -D arguments have been processed.
2724   scp_p->expand_endorsed();
2725 
2726   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2727     // Assemble the bootclasspath elements into the final path.
2728     Arguments::set_sysclasspath(scp_p->combined_path());
2729   }
2730 
2731   // This must be done after all arguments have been processed.
2732   // java_compiler() true means set to "NONE" or empty.
2733   if (java_compiler() && !xdebug_mode()) {
2734     // For backwards compatibility, we switch to interpreted mode if
2735     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2736     // not specified.
2737     set_mode_flags(_int);
2738   }
2739   if (CompileThreshold == 0) {
2740     set_mode_flags(_int);
2741   }
2742 
2743 #ifndef COMPILER2
2744   // Don't degrade server performance for footprint
2745   if (FLAG_IS_DEFAULT(UseLargePages) &&
2746       MaxHeapSize < LargePageHeapSizeThreshold) {
2747     // No need for large granularity pages w/small heaps.
2748     // Note that large pages are enabled/disabled for both the
2749     // Java heap and the code cache.
2750     FLAG_SET_DEFAULT(UseLargePages, false);
2751     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2752     SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2753   }
2754 
2755   // Tiered compilation is undefined with C1.
2756   TieredCompilation = false;
2757 #else
2758   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2759     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2760   }
2761 #endif
2762 
2763   // If we are running in a headless jre, force java.awt.headless property
2764   // to be true unless the property has already been set.
2765   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2766   if (os::is_headless_jre()) {
2767     const char* headless = Arguments::get_property("java.awt.headless");
2768     if (headless == NULL) {
2769       char envbuffer[128];
2770       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2771         if (!add_property("java.awt.headless=true")) {
2772           return JNI_ENOMEM;
2773         }
2774       } else {
2775         char buffer[256];
2776         strcpy(buffer, "java.awt.headless=");
2777         strcat(buffer, envbuffer);
2778         if (!add_property(buffer)) {
2779           return JNI_ENOMEM;
2780         }
2781       }
2782     }
2783   }
2784 
2785   if (!check_vm_args_consistency()) {
2786     return JNI_ERR;
2787   }
2788 
2789   return JNI_OK;
2790 }
2791 
2792 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2793   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2794                                             scp_assembly_required_p);
2795 }
2796 
2797 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2798   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2799                                             scp_assembly_required_p);
2800 }
2801 
2802 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2803   const int N_MAX_OPTIONS = 64;
2804   const int OPTION_BUFFER_SIZE = 1024;
2805   char buffer[OPTION_BUFFER_SIZE];
2806 
2807   // The variable will be ignored if it exceeds the length of the buffer.
2808   // Don't check this variable if user has special privileges
2809   // (e.g. unix su command).
2810   if (os::getenv(name, buffer, sizeof(buffer)) &&
2811       !os::have_special_privileges()) {
2812     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
2813     jio_fprintf(defaultStream::error_stream(),
2814                 "Picked up %s: %s\n", name, buffer);
2815     char* rd = buffer;                        // pointer to the input string (rd)
2816     int i;
2817     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
2818       while (isspace(*rd)) rd++;              // skip whitespace
2819       if (*rd == 0) break;                    // we re done when the input string is read completely
2820 
2821       // The output, option string, overwrites the input string.
2822       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2823       // input string (rd).
2824       char* wrt = rd;
2825 
2826       options[i++].optionString = wrt;        // Fill in option
2827       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
2828         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
2829           int quote = *rd;                    // matching quote to look for
2830           rd++;                               // don't copy open quote
2831           while (*rd != quote) {              // include everything (even spaces) up until quote
2832             if (*rd == 0) {                   // string termination means unmatched string
2833               jio_fprintf(defaultStream::error_stream(),
2834                           "Unmatched quote in %s\n", name);
2835               return JNI_ERR;
2836             }
2837             *wrt++ = *rd++;                   // copy to option string
2838           }
2839           rd++;                               // don't copy close quote
2840         } else {
2841           *wrt++ = *rd++;                     // copy to option string
2842         }
2843       }
2844       // Need to check if we're done before writing a NULL,
2845       // because the write could be to the byte that rd is pointing to.
2846       if (*rd++ == 0) {
2847         *wrt = 0;
2848         break;
2849       }
2850       *wrt = 0;                               // Zero terminate option
2851     }
2852     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2853     JavaVMInitArgs vm_args;
2854     vm_args.version = JNI_VERSION_1_2;
2855     vm_args.options = options;
2856     vm_args.nOptions = i;
2857     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2858 
2859     if (PrintVMOptions) {
2860       const char* tail;
2861       for (int i = 0; i < vm_args.nOptions; i++) {
2862         const JavaVMOption *option = vm_args.options + i;
2863         if (match_option(option, "-XX:", &tail)) {
2864           logOption(tail);
2865         }
2866       }
2867     }
2868 
2869     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2870   }
2871   return JNI_OK;
2872 }
2873 
2874 void Arguments::set_shared_spaces_flags() {
2875   const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2876   const bool might_share = must_share || UseSharedSpaces;
2877 
2878   // The string table is part of the shared archive so the size must match.
2879   if (!FLAG_IS_DEFAULT(StringTableSize)) {
2880     // Disable sharing.
2881     if (must_share) {
2882       warning("disabling shared archive %s because of non-default "
2883               "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2884     }
2885     if (might_share) {
2886       FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2887       FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2888       FLAG_SET_DEFAULT(UseSharedSpaces, false);
2889     }
2890     return;
2891   }
2892 
2893   // Check whether class data sharing settings conflict with GC, compressed oops
2894   // or page size, and fix them up.  Explicit sharing options override other
2895   // settings.
2896   const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2897     UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2898     UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2899   if (cannot_share) {
2900     if (must_share) {
2901         warning("selecting serial gc and disabling large pages %s"
2902                 "because of %s", "" LP64_ONLY("and compressed oops "),
2903                 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2904         force_serial_gc();
2905         FLAG_SET_CMDLINE(bool, UseLargePages, false);
2906         LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2907     } else {
2908       if (UseSharedSpaces && Verbose) {
2909         warning("turning off use of shared archive because of "
2910                 "choice of garbage collector or large pages");
2911       }
2912       no_shared_spaces();
2913     }
2914   } else if (UseLargePages && might_share) {
2915     // Disable large pages to allow shared spaces.  This is sub-optimal, since
2916     // there may not even be a shared archive to use.
2917     FLAG_SET_DEFAULT(UseLargePages, false);
2918   }
2919 }
2920 
2921 // Disable options not supported in this release, with a warning if they
2922 // were explicitly requested on the command-line
2923 #define UNSUPPORTED_OPTION(opt, description)                    \
2924 do {                                                            \
2925   if (opt) {                                                    \
2926     if (FLAG_IS_CMDLINE(opt)) {                                 \
2927       warning(description " is disabled in this release.");     \
2928     }                                                           \
2929     FLAG_SET_DEFAULT(opt, false);                               \
2930   }                                                             \
2931 } while(0)
2932 
2933 // Parse entry point called from JNI_CreateJavaVM
2934 
2935 jint Arguments::parse(const JavaVMInitArgs* args) {
2936 
2937   // Sharing support
2938   // Construct the path to the archive
2939   char jvm_path[JVM_MAXPATHLEN];
2940   os::jvm_path(jvm_path, sizeof(jvm_path));
2941   char *end = strrchr(jvm_path, *os::file_separator());
2942   if (end != NULL) *end = '\0';
2943   char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2944                                         strlen(os::file_separator()) + 20);
2945   if (shared_archive_path == NULL) return JNI_ENOMEM;
2946   strcpy(shared_archive_path, jvm_path);
2947   strcat(shared_archive_path, os::file_separator());
2948   strcat(shared_archive_path, "classes");
2949   DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2950   strcat(shared_archive_path, ".jsa");
2951   SharedArchivePath = shared_archive_path;
2952 
2953   // Remaining part of option string
2954   const char* tail;
2955 
2956   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2957   bool settings_file_specified = false;
2958   const char* flags_file;
2959   int index;
2960   for (index = 0; index < args->nOptions; index++) {
2961     const JavaVMOption *option = args->options + index;
2962     if (match_option(option, "-XX:Flags=", &tail)) {
2963       flags_file = tail;
2964       settings_file_specified = true;
2965     }
2966     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2967       PrintVMOptions = true;
2968     }
2969     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2970       PrintVMOptions = false;
2971     }
2972     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2973       IgnoreUnrecognizedVMOptions = true;
2974     }
2975     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2976       IgnoreUnrecognizedVMOptions = false;
2977     }
2978     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2979       CommandLineFlags::printFlags(tty, false);
2980       vm_exit(0);
2981     }
2982 
2983 #ifndef PRODUCT
2984     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2985       CommandLineFlags::printFlags(tty, true);
2986       vm_exit(0);
2987     }
2988 #endif
2989   }
2990 
2991   if (IgnoreUnrecognizedVMOptions) {
2992     // uncast const to modify the flag args->ignoreUnrecognized
2993     *(jboolean*)(&args->ignoreUnrecognized) = true;
2994   }
2995 
2996   // Parse specified settings file
2997   if (settings_file_specified) {
2998     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2999       return JNI_EINVAL;
3000     }
3001   }
3002 
3003   // Parse default .hotspotrc settings file
3004   if (!settings_file_specified) {
3005     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3006       return JNI_EINVAL;
3007     }
3008   }
3009 
3010   if (PrintVMOptions) {
3011     for (index = 0; index < args->nOptions; index++) {
3012       const JavaVMOption *option = args->options + index;
3013       if (match_option(option, "-XX:", &tail)) {
3014         logOption(tail);
3015       }
3016     }
3017   }
3018 
3019   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3020   jint result = parse_vm_init_args(args);
3021   if (result != JNI_OK) {
3022     return result;
3023   }
3024 
3025 #ifdef JAVASE_EMBEDDED
3026   UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3027 #endif
3028 
3029 #ifndef PRODUCT
3030   if (TraceBytecodesAt != 0) {
3031     TraceBytecodes = true;
3032   }
3033   if (CountCompiledCalls) {
3034     if (UseCounterDecay) {
3035       warning("UseCounterDecay disabled because CountCalls is set");
3036       UseCounterDecay = false;
3037     }
3038   }
3039 #endif // PRODUCT
3040 
3041   // Transitional
3042   if (EnableMethodHandles || AnonymousClasses) {
3043     if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3044       warning("EnableMethodHandles and AnonymousClasses are obsolete.  Keeping EnableInvokeDynamic disabled.");
3045     } else {
3046       EnableInvokeDynamic = true;
3047     }
3048   }
3049 
3050   // JSR 292 is not supported before 1.7
3051   if (!JDK_Version::is_gte_jdk17x_version()) {
3052     if (EnableInvokeDynamic) {
3053       if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3054         warning("JSR 292 is not supported before 1.7.  Disabling support.");
3055       }
3056       EnableInvokeDynamic = false;
3057     }
3058   }
3059 
3060   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3061     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3062       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3063     }
3064     ScavengeRootsInCode = 1;
3065   }
3066   if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3067     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3068       warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3069     }
3070     ScavengeRootsInCode = 1;
3071   }
3072 
3073   if (PrintGCDetails) {
3074     // Turn on -verbose:gc options as well
3075     PrintGC = true;
3076   }
3077 
3078   // Set object alignment values.
3079   set_object_alignment();
3080 
3081 #ifdef SERIALGC
3082   force_serial_gc();
3083 #endif // SERIALGC
3084 #ifdef KERNEL
3085   no_shared_spaces();
3086 #endif // KERNEL
3087 
3088   // Set flags based on ergonomics.
3089   set_ergonomics_flags();
3090 
3091   set_shared_spaces_flags();
3092 
3093   // Check the GC selections again.
3094   if (!check_gc_consistency()) {
3095     return JNI_EINVAL;
3096   }
3097 
3098   if (TieredCompilation) {
3099     set_tiered_flags();
3100   } else {
3101     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3102     if (CompilationPolicyChoice >= 2) {
3103       vm_exit_during_initialization(
3104         "Incompatible compilation policy selected", NULL);
3105     }
3106   }
3107 
3108 #ifndef KERNEL
3109   // Set heap size based on available physical memory
3110   set_heap_size();
3111   // Set per-collector flags
3112   if (UseParallelGC || UseParallelOldGC) {
3113     set_parallel_gc_flags();
3114   } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3115     set_cms_and_parnew_gc_flags();
3116   } else if (UseParNewGC) {  // skipped if CMS is set above
3117     set_parnew_gc_flags();
3118   } else if (UseG1GC) {
3119     set_g1_gc_flags();
3120   }
3121 #endif // KERNEL
3122 
3123 #ifdef SERIALGC
3124   assert(verify_serial_gc_flags(), "SerialGC unset");
3125 #endif // SERIALGC
3126 
3127   // Set bytecode rewriting flags
3128   set_bytecode_flags();
3129 
3130   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3131   set_aggressive_opts_flags();
3132 
3133   // Turn off biased locking for locking debug mode flags,
3134   // which are subtlely different from each other but neither works with
3135   // biased locking.
3136   if (UseHeavyMonitors
3137 #ifdef COMPILER1
3138       || !UseFastLocking
3139 #endif // COMPILER1
3140     ) {
3141     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3142       // flag set to true on command line; warn the user that they
3143       // can't enable biased locking here
3144       warning("Biased Locking is not supported with locking debug flags"
3145               "; ignoring UseBiasedLocking flag." );
3146     }
3147     UseBiasedLocking = false;
3148   }
3149 
3150 #ifdef CC_INTERP
3151   // Clear flags not supported by the C++ interpreter
3152   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3153   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3154   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3155 #endif // CC_INTERP
3156 
3157 #ifdef COMPILER2
3158   if (!UseBiasedLocking || EmitSync != 0) {
3159     UseOptoBiasInlining = false;
3160   }
3161   if (!EliminateLocks) {
3162     EliminateNestedLocks = false;
3163   }
3164 #endif
3165 
3166   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3167     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3168     DebugNonSafepoints = true;
3169   }
3170 
3171 #ifndef PRODUCT
3172   if (CompileTheWorld) {
3173     // Force NmethodSweeper to sweep whole CodeCache each time.
3174     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3175       NmethodSweepFraction = 1;
3176     }
3177   }
3178 #endif
3179 
3180   if (PrintCommandLineFlags) {
3181     CommandLineFlags::printSetFlags(tty);
3182   }
3183 
3184   // Apply CPU specific policy for the BiasedLocking
3185   if (UseBiasedLocking) {
3186     if (!VM_Version::use_biased_locking() &&
3187         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3188       UseBiasedLocking = false;
3189     }
3190   }
3191 
3192   // set PauseAtExit if the gamma launcher was used and a debugger is attached
3193   // but only if not already set on the commandline
3194   if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3195     bool set = false;
3196     CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3197     if (!set) {
3198       FLAG_SET_DEFAULT(PauseAtExit, true);
3199     }
3200   }
3201 
3202   return JNI_OK;
3203 }
3204 
3205 int Arguments::PropertyList_count(SystemProperty* pl) {
3206   int count = 0;
3207   while(pl != NULL) {
3208     count++;
3209     pl = pl->next();
3210   }
3211   return count;
3212 }
3213 
3214 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3215   assert(key != NULL, "just checking");
3216   SystemProperty* prop;
3217   for (prop = pl; prop != NULL; prop = prop->next()) {
3218     if (strcmp(key, prop->key()) == 0) return prop->value();
3219   }
3220   return NULL;
3221 }
3222 
3223 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3224   int count = 0;
3225   const char* ret_val = NULL;
3226 
3227   while(pl != NULL) {
3228     if(count >= index) {
3229       ret_val = pl->key();
3230       break;
3231     }
3232     count++;
3233     pl = pl->next();
3234   }
3235 
3236   return ret_val;
3237 }
3238 
3239 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3240   int count = 0;
3241   char* ret_val = NULL;
3242 
3243   while(pl != NULL) {
3244     if(count >= index) {
3245       ret_val = pl->value();
3246       break;
3247     }
3248     count++;
3249     pl = pl->next();
3250   }
3251 
3252   return ret_val;
3253 }
3254 
3255 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3256   SystemProperty* p = *plist;
3257   if (p == NULL) {
3258     *plist = new_p;
3259   } else {
3260     while (p->next() != NULL) {
3261       p = p->next();
3262     }
3263     p->set_next(new_p);
3264   }
3265 }
3266 
3267 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3268   if (plist == NULL)
3269     return;
3270 
3271   SystemProperty* new_p = new SystemProperty(k, v, true);
3272   PropertyList_add(plist, new_p);
3273 }
3274 
3275 // This add maintains unique property key in the list.
3276 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3277   if (plist == NULL)
3278     return;
3279 
3280   // If property key exist then update with new value.
3281   SystemProperty* prop;
3282   for (prop = *plist; prop != NULL; prop = prop->next()) {
3283     if (strcmp(k, prop->key()) == 0) {
3284       if (append) {
3285         prop->append_value(v);
3286       } else {
3287         prop->set_value(v);
3288       }
3289       return;
3290     }
3291   }
3292 
3293   PropertyList_add(plist, k, v);
3294 }
3295 
3296 #ifdef KERNEL
3297 char *Arguments::get_kernel_properties() {
3298   // Find properties starting with kernel and append them to string
3299   // We need to find out how long they are first because the URL's that they
3300   // might point to could get long.
3301   int length = 0;
3302   SystemProperty* prop;
3303   for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3304     if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3305       length += (strlen(prop->key()) + strlen(prop->value()) + 5);  // "-D ="
3306     }
3307   }
3308   // Add one for null terminator.
3309   char *props = AllocateHeap(length + 1, "get_kernel_properties");
3310   if (length != 0) {
3311     int pos = 0;
3312     for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3313       if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3314         jio_snprintf(&props[pos], length-pos,
3315                      "-D%s=%s ", prop->key(), prop->value());
3316         pos = strlen(props);
3317       }
3318     }
3319   }
3320   // null terminate props in case of null
3321   props[length] = '\0';
3322   return props;
3323 }
3324 #endif // KERNEL
3325 
3326 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3327 // Returns true if all of the source pointed by src has been copied over to
3328 // the destination buffer pointed by buf. Otherwise, returns false.
3329 // Notes:
3330 // 1. If the length (buflen) of the destination buffer excluding the
3331 // NULL terminator character is not long enough for holding the expanded
3332 // pid characters, it also returns false instead of returning the partially
3333 // expanded one.
3334 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3335 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3336                                 char* buf, size_t buflen) {
3337   const char* p = src;
3338   char* b = buf;
3339   const char* src_end = &src[srclen];
3340   char* buf_end = &buf[buflen - 1];
3341 
3342   while (p < src_end && b < buf_end) {
3343     if (*p == '%') {
3344       switch (*(++p)) {
3345       case '%':         // "%%" ==> "%"
3346         *b++ = *p++;
3347         break;
3348       case 'p':  {       //  "%p" ==> current process id
3349         // buf_end points to the character before the last character so
3350         // that we could write '\0' to the end of the buffer.
3351         size_t buf_sz = buf_end - b + 1;
3352         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3353 
3354         // if jio_snprintf fails or the buffer is not long enough to hold
3355         // the expanded pid, returns false.
3356         if (ret < 0 || ret >= (int)buf_sz) {
3357           return false;
3358         } else {
3359           b += ret;
3360           assert(*b == '\0', "fail in copy_expand_pid");
3361           if (p == src_end && b == buf_end + 1) {
3362             // reach the end of the buffer.
3363             return true;
3364           }
3365         }
3366         p++;
3367         break;
3368       }
3369       default :
3370         *b++ = '%';
3371       }
3372     } else {
3373       *b++ = *p++;
3374     }
3375   }
3376   *b = '\0';
3377   return (p == src_end); // return false if not all of the source was copied
3378 }