1 /*
   2  * Copyright (c) 1997, 2015, 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/classLoader.hpp"
  27 #include "classfile/javaAssertions.hpp"
  28 #include "classfile/stringTable.hpp"
  29 #include "classfile/symbolTable.hpp"
  30 #include "compiler/compilerOracle.hpp"
  31 #include "gc/shared/cardTableRS.hpp"
  32 #include "gc/shared/genCollectedHeap.hpp"
  33 #include "gc/shared/referenceProcessor.hpp"
  34 #include "gc/shared/taskqueue.hpp"
  35 #include "memory/allocation.inline.hpp"
  36 #include "memory/universe.inline.hpp"
  37 #include "oops/oop.inline.hpp"
  38 #include "prims/jvmtiExport.hpp"
  39 #include "runtime/arguments.hpp"
  40 #include "runtime/arguments_ext.hpp"
  41 #include "runtime/commandLineFlagConstraintList.hpp"
  42 #include "runtime/commandLineFlagRangeList.hpp"
  43 #include "runtime/globals.hpp"
  44 #include "runtime/globals_extension.hpp"
  45 #include "runtime/java.hpp"
  46 #include "runtime/os.hpp"
  47 #include "runtime/vm_version.hpp"
  48 #include "services/management.hpp"
  49 #include "services/memTracker.hpp"
  50 #include "utilities/defaultStream.hpp"
  51 #include "utilities/macros.hpp"
  52 #include "utilities/semaphore.hpp"
  53 #include "utilities/stringUtils.hpp"
  54 #if INCLUDE_ALL_GCS
  55 #include "gc/cms/compactibleFreeListSpace.hpp"
  56 #include "gc/g1/g1CollectedHeap.inline.hpp"
  57 #include "gc/parallel/parallelScavengeHeap.hpp"
  58 #endif // INCLUDE_ALL_GCS
  59 
  60 // Note: This is a special bug reporting site for the JVM
  61 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  62 #define DEFAULT_JAVA_LAUNCHER  "generic"
  63 
  64 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  65 do {                                                                  \
  66   if (gc) {                                                           \
  67     if (FLAG_IS_CMDLINE(gc)) {                                        \
  68       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  69     }                                                                 \
  70     FLAG_SET_DEFAULT(gc, false);                                      \
  71   }                                                                   \
  72 } while(0)
  73 
  74 char** Arguments::_jvm_flags_array              = NULL;
  75 int    Arguments::_num_jvm_flags                = 0;
  76 char** Arguments::_jvm_args_array               = NULL;
  77 int    Arguments::_num_jvm_args                 = 0;
  78 char*  Arguments::_java_command                 = NULL;
  79 SystemProperty* Arguments::_system_properties   = NULL;
  80 const char*  Arguments::_gc_log_filename        = NULL;
  81 bool   Arguments::_has_profile                  = false;
  82 size_t Arguments::_conservative_max_heap_alignment = 0;
  83 size_t Arguments::_min_heap_size                = 0;
  84 uintx  Arguments::_min_heap_free_ratio          = 0;
  85 uintx  Arguments::_max_heap_free_ratio          = 0;
  86 Arguments::Mode Arguments::_mode                = _mixed;
  87 bool   Arguments::_java_compiler                = false;
  88 bool   Arguments::_xdebug_mode                  = false;
  89 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  90 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  91 int    Arguments::_sun_java_launcher_pid        = -1;
  92 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
  93 
  94 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
  95 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  96 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  97 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  98 bool   Arguments::_ClipInlining                 = ClipInlining;
  99 intx   Arguments::_Tier3InvokeNotifyFreqLog     = Tier3InvokeNotifyFreqLog;
 100 intx   Arguments::_Tier4InvocationThreshold     = Tier4InvocationThreshold;
 101 
 102 char*  Arguments::SharedArchivePath             = NULL;
 103 
 104 AgentLibraryList Arguments::_libraryList;
 105 AgentLibraryList Arguments::_agentList;
 106 
 107 abort_hook_t     Arguments::_abort_hook         = NULL;
 108 exit_hook_t      Arguments::_exit_hook          = NULL;
 109 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 110 
 111 
 112 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 113 SystemProperty *Arguments::_java_library_path = NULL;
 114 SystemProperty *Arguments::_java_home = NULL;
 115 SystemProperty *Arguments::_java_class_path = NULL;
 116 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 117 
 118 char* Arguments::_ext_dirs = NULL;
 119 
 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 121 // part of the option string.
 122 static bool match_option(const JavaVMOption *option, const char* name,
 123                          const char** tail) {
 124   int len = (int)strlen(name);
 125   if (strncmp(option->optionString, name, len) == 0) {
 126     *tail = option->optionString + len;
 127     return true;
 128   } else {
 129     return false;
 130   }
 131 }
 132 
 133 // Check if 'option' matches 'name'. No "tail" is allowed.
 134 static bool match_option(const JavaVMOption *option, const char* name) {
 135   const char* tail = NULL;
 136   bool result = match_option(option, name, &tail);
 137   if (tail != NULL && *tail == '\0') {
 138     return result;
 139   } else {
 140     return false;
 141   }
 142 }
 143 
 144 // Return true if any of the strings in null-terminated array 'names' matches.
 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 146 // the option must match exactly.
 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 148   bool tail_allowed) {
 149   for (/* empty */; *names != NULL; ++names) {
 150     if (match_option(option, *names, tail)) {
 151       if (**tail == '\0' || tail_allowed && **tail == ':') {
 152         return true;
 153       }
 154     }
 155   }
 156   return false;
 157 }
 158 
 159 static void logOption(const char* opt) {
 160   if (PrintVMOptions) {
 161     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 162   }
 163 }
 164 
 165 // Process java launcher properties.
 166 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 167   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 168   // sun.java.launcher.pid is defined.
 169   // Must do this before setting up other system properties,
 170   // as some of them may depend on launcher type.
 171   for (int index = 0; index < args->nOptions; index++) {
 172     const JavaVMOption* option = args->options + index;
 173     const char* tail;
 174 
 175     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 176       process_java_launcher_argument(tail, option->extraInfo);
 177       continue;
 178     }
 179     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 180       if (strcmp(tail, "true") == 0) {
 181         _sun_java_launcher_is_altjvm = true;
 182       }
 183       continue;
 184     }
 185     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 186       _sun_java_launcher_pid = atoi(tail);
 187       continue;
 188     }
 189   }
 190 }
 191 
 192 // Initialize system properties key and value.
 193 void Arguments::init_system_properties() {
 194   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 195                                                                  "Java Virtual Machine Specification",  false));
 196   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 197   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 198   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 199 
 200   // Following are JVMTI agent writable properties.
 201   // Properties values are set to NULL and they are
 202   // os specific they are initialized in os::init_system_properties_values().
 203   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 204   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 205   _java_home =  new SystemProperty("java.home", NULL,  true);
 206   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 207 
 208   _java_class_path = new SystemProperty("java.class.path", "",  true);
 209 
 210   // Add to System Property list.
 211   PropertyList_add(&_system_properties, _sun_boot_library_path);
 212   PropertyList_add(&_system_properties, _java_library_path);
 213   PropertyList_add(&_system_properties, _java_home);
 214   PropertyList_add(&_system_properties, _java_class_path);
 215   PropertyList_add(&_system_properties, _sun_boot_class_path);
 216 
 217   // Set OS specific system properties values
 218   os::init_system_properties_values();
 219 }
 220 
 221 // Update/Initialize System properties after JDK version number is known
 222 void Arguments::init_version_specific_system_properties() {
 223   enum { bufsz = 16 };
 224   char buffer[bufsz];
 225   const char* spec_vendor = "Sun Microsystems Inc.";
 226   uint32_t spec_version = 0;
 227 
 228   spec_vendor = "Oracle Corporation";
 229   spec_version = JDK_Version::current().major_version();
 230   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 231 
 232   PropertyList_add(&_system_properties,
 233       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 234   PropertyList_add(&_system_properties,
 235       new SystemProperty("java.vm.specification.version", buffer, false));
 236   PropertyList_add(&_system_properties,
 237       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 238 }
 239 
 240 /**
 241  * Provide a slightly more user-friendly way of eliminating -XX flags.
 242  * When a flag is eliminated, it can be added to this list in order to
 243  * continue accepting this flag on the command-line, while issuing a warning
 244  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 245  * limit, we flatly refuse to admit the existence of the flag.  This allows
 246  * a flag to die correctly over JDK releases using HSX.
 247  * But now that HSX is no longer supported only options with a future
 248  * accept_until value need to be listed, and the list can be pruned
 249  * on each major release.
 250  */
 251 typedef struct {
 252   const char* name;
 253   JDK_Version obsoleted_in; // when the flag went away
 254   JDK_Version accept_until; // which version to start denying the existence
 255 } ObsoleteFlag;
 256 
 257 static ObsoleteFlag obsolete_jvm_flags[] = {
 258   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 259   { "SafepointPollOffset",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 260   { "UseBoundThreads",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 261   { "DefaultThreadPriority",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 262   { "NoYieldsInMicrolock",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 263   { "BackEdgeThreshold",             JDK_Version::jdk(9), JDK_Version::jdk(10) },
 264   { "UseNewReflection",              JDK_Version::jdk(9), JDK_Version::jdk(10) },
 265   { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
 266   { "VerifyReflectionBytecodes",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 267   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 268   { "NmethodSweepFraction",          JDK_Version::jdk(9), JDK_Version::jdk(10) },
 269   { "NmethodSweepCheckInterval",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 270   { "CodeCacheMinimumFreeSpace",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 271 #ifndef ZERO
 272   { "UseFastAccessorMethods",        JDK_Version::jdk(9), JDK_Version::jdk(10) },
 273   { "UseFastEmptyMethods",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 274 #endif // ZERO
 275   { "UseCompilerSafepoints",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 276   { "AdaptiveSizePausePolicy",       JDK_Version::jdk(9), JDK_Version::jdk(10) },
 277   { "ParallelGCRetainPLAB",          JDK_Version::jdk(9), JDK_Version::jdk(10) },
 278   { "ThreadSafetyMargin",            JDK_Version::jdk(9), JDK_Version::jdk(10) },
 279   { NULL, JDK_Version(0), JDK_Version(0) }
 280 };
 281 
 282 // Returns true if the flag is obsolete and fits into the range specified
 283 // for being ignored.  In the case that the flag is ignored, the 'version'
 284 // value is filled in with the version number when the flag became
 285 // obsolete so that that value can be displayed to the user.
 286 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 287   int i = 0;
 288   assert(version != NULL, "Must provide a version buffer");
 289   while (obsolete_jvm_flags[i].name != NULL) {
 290     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 291     // <flag>=xxx form
 292     // [-|+]<flag> form
 293     size_t len = strlen(flag_status.name);
 294     if ((strncmp(flag_status.name, s, len) == 0) &&
 295         (strlen(s) == len)){
 296       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 297           *version = flag_status.obsoleted_in;
 298           return true;
 299       }
 300     }
 301     i++;
 302   }
 303   return false;
 304 }
 305 
 306 // Constructs the system class path (aka boot class path) from the following
 307 // components, in order:
 308 //
 309 //     prefix           // from -Xbootclasspath/p:...
 310 //     base             // from os::get_system_properties() or -Xbootclasspath=
 311 //     suffix           // from -Xbootclasspath/a:...
 312 //
 313 // This could be AllStatic, but it isn't needed after argument processing is
 314 // complete.
 315 class SysClassPath: public StackObj {
 316 public:
 317   SysClassPath(const char* base);
 318   ~SysClassPath();
 319 
 320   inline void set_base(const char* base);
 321   inline void add_prefix(const char* prefix);
 322   inline void add_suffix_to_prefix(const char* suffix);
 323   inline void add_suffix(const char* suffix);
 324   inline void reset_path(const char* base);
 325 
 326   inline const char* get_base()     const { return _items[_scp_base]; }
 327   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 328   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 329 
 330   // Combine all the components into a single c-heap-allocated string; caller
 331   // must free the string if/when no longer needed.
 332   char* combined_path();
 333 
 334 private:
 335   // Utility routines.
 336   static char* add_to_path(const char* path, const char* str, bool prepend);
 337   static char* add_jars_to_path(char* path, const char* directory);
 338 
 339   inline void reset_item_at(int index);
 340 
 341   // Array indices for the items that make up the sysclasspath.  All except the
 342   // base are allocated in the C heap and freed by this class.
 343   enum {
 344     _scp_prefix,        // from -Xbootclasspath/p:...
 345     _scp_base,          // the default sysclasspath
 346     _scp_suffix,        // from -Xbootclasspath/a:...
 347     _scp_nitems         // the number of items, must be last.
 348   };
 349 
 350   const char* _items[_scp_nitems];
 351 };
 352 
 353 SysClassPath::SysClassPath(const char* base) {
 354   memset(_items, 0, sizeof(_items));
 355   _items[_scp_base] = base;
 356 }
 357 
 358 SysClassPath::~SysClassPath() {
 359   // Free everything except the base.
 360   for (int i = 0; i < _scp_nitems; ++i) {
 361     if (i != _scp_base) reset_item_at(i);
 362   }
 363 }
 364 
 365 inline void SysClassPath::set_base(const char* base) {
 366   _items[_scp_base] = base;
 367 }
 368 
 369 inline void SysClassPath::add_prefix(const char* prefix) {
 370   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 371 }
 372 
 373 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 374   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 375 }
 376 
 377 inline void SysClassPath::add_suffix(const char* suffix) {
 378   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 379 }
 380 
 381 inline void SysClassPath::reset_item_at(int index) {
 382   assert(index < _scp_nitems && index != _scp_base, "just checking");
 383   if (_items[index] != NULL) {
 384     FREE_C_HEAP_ARRAY(char, _items[index]);
 385     _items[index] = NULL;
 386   }
 387 }
 388 
 389 inline void SysClassPath::reset_path(const char* base) {
 390   // Clear the prefix and suffix.
 391   reset_item_at(_scp_prefix);
 392   reset_item_at(_scp_suffix);
 393   set_base(base);
 394 }
 395 
 396 //------------------------------------------------------------------------------
 397 
 398 
 399 // Combine the bootclasspath elements, some of which may be null, into a single
 400 // c-heap-allocated string.
 401 char* SysClassPath::combined_path() {
 402   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 403 
 404   size_t lengths[_scp_nitems];
 405   size_t total_len = 0;
 406 
 407   const char separator = *os::path_separator();
 408 
 409   // Get the lengths.
 410   int i;
 411   for (i = 0; i < _scp_nitems; ++i) {
 412     if (_items[i] != NULL) {
 413       lengths[i] = strlen(_items[i]);
 414       // Include space for the separator char (or a NULL for the last item).
 415       total_len += lengths[i] + 1;
 416     }
 417   }
 418   assert(total_len > 0, "empty sysclasspath not allowed");
 419 
 420   // Copy the _items to a single string.
 421   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 422   char* cp_tmp = cp;
 423   for (i = 0; i < _scp_nitems; ++i) {
 424     if (_items[i] != NULL) {
 425       memcpy(cp_tmp, _items[i], lengths[i]);
 426       cp_tmp += lengths[i];
 427       *cp_tmp++ = separator;
 428     }
 429   }
 430   *--cp_tmp = '\0';     // Replace the extra separator.
 431   return cp;
 432 }
 433 
 434 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 435 char*
 436 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 437   char *cp;
 438 
 439   assert(str != NULL, "just checking");
 440   if (path == NULL) {
 441     size_t len = strlen(str) + 1;
 442     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 443     memcpy(cp, str, len);                       // copy the trailing null
 444   } else {
 445     const char separator = *os::path_separator();
 446     size_t old_len = strlen(path);
 447     size_t str_len = strlen(str);
 448     size_t len = old_len + str_len + 2;
 449 
 450     if (prepend) {
 451       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 452       char* cp_tmp = cp;
 453       memcpy(cp_tmp, str, str_len);
 454       cp_tmp += str_len;
 455       *cp_tmp = separator;
 456       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 457       FREE_C_HEAP_ARRAY(char, path);
 458     } else {
 459       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 460       char* cp_tmp = cp + old_len;
 461       *cp_tmp = separator;
 462       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 463     }
 464   }
 465   return cp;
 466 }
 467 
 468 // Scan the directory and append any jar or zip files found to path.
 469 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 470 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 471   DIR* dir = os::opendir(directory);
 472   if (dir == NULL) return path;
 473 
 474   char dir_sep[2] = { '\0', '\0' };
 475   size_t directory_len = strlen(directory);
 476   const char fileSep = *os::file_separator();
 477   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 478 
 479   /* Scan the directory for jars/zips, appending them to path. */
 480   struct dirent *entry;
 481   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 482   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 483     const char* name = entry->d_name;
 484     const char* ext = name + strlen(name) - 4;
 485     bool isJarOrZip = ext > name &&
 486       (os::file_name_strcmp(ext, ".jar") == 0 ||
 487        os::file_name_strcmp(ext, ".zip") == 0);
 488     if (isJarOrZip) {
 489       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 490       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 491       path = add_to_path(path, jarpath, false);
 492       FREE_C_HEAP_ARRAY(char, jarpath);
 493     }
 494   }
 495   FREE_C_HEAP_ARRAY(char, dbuf);
 496   os::closedir(dir);
 497   return path;
 498 }
 499 
 500 // Parses a memory size specification string.
 501 static bool atomull(const char *s, julong* result) {
 502   julong n = 0;
 503   int args_read = 0;
 504   bool is_hex = false;
 505   // Skip leading 0[xX] for hexadecimal
 506   if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
 507     s += 2;
 508     is_hex = true;
 509     args_read = sscanf(s, JULONG_FORMAT_X, &n);
 510   } else {
 511     args_read = sscanf(s, JULONG_FORMAT, &n);
 512   }
 513   if (args_read != 1) {
 514     return false;
 515   }
 516   while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
 517     s++;
 518   }
 519   // 4705540: illegal if more characters are found after the first non-digit
 520   if (strlen(s) > 1) {
 521     return false;
 522   }
 523   switch (*s) {
 524     case 'T': case 't':
 525       *result = n * G * K;
 526       // Check for overflow.
 527       if (*result/((julong)G * K) != n) return false;
 528       return true;
 529     case 'G': case 'g':
 530       *result = n * G;
 531       if (*result/G != n) return false;
 532       return true;
 533     case 'M': case 'm':
 534       *result = n * M;
 535       if (*result/M != n) return false;
 536       return true;
 537     case 'K': case 'k':
 538       *result = n * K;
 539       if (*result/K != n) return false;
 540       return true;
 541     case '\0':
 542       *result = n;
 543       return true;
 544     default:
 545       return false;
 546   }
 547 }
 548 
 549 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 550   if (size < min_size) return arg_too_small;
 551   // Check that size will fit in a size_t (only relevant on 32-bit)
 552   if (size > max_uintx) return arg_too_big;
 553   return arg_in_range;
 554 }
 555 
 556 // Describe an argument out of range error
 557 void Arguments::describe_range_error(ArgsRange errcode) {
 558   switch(errcode) {
 559   case arg_too_big:
 560     jio_fprintf(defaultStream::error_stream(),
 561                 "The specified size exceeds the maximum "
 562                 "representable size.\n");
 563     break;
 564   case arg_too_small:
 565   case arg_unreadable:
 566   case arg_in_range:
 567     // do nothing for now
 568     break;
 569   default:
 570     ShouldNotReachHere();
 571   }
 572 }
 573 
 574 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 575   if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
 576     return true;
 577   } else {
 578     return false;
 579   }
 580 }
 581 
 582 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 583   double v;
 584   if (sscanf(value, "%lf", &v) != 1) {
 585     return false;
 586   }
 587 
 588   if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
 589     return true;
 590   }
 591   return false;
 592 }
 593 
 594 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 595   julong v;
 596   int int_v;
 597   intx intx_v;
 598   bool is_neg = false;
 599   // Check the sign first since atomull() parses only unsigned values.
 600   if (*value == '-') {
 601     if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
 602       return false;
 603     }
 604     value++;
 605     is_neg = true;
 606   }
 607   if (!atomull(value, &v)) {
 608     return false;
 609   }
 610   int_v = (int) v;
 611   if (is_neg) {
 612     int_v = -int_v;
 613   }
 614   if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
 615     return true;
 616   }
 617   uint uint_v = (uint) v;
 618   if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
 619     return true;
 620   }
 621   intx_v = (intx) v;
 622   if (is_neg) {
 623     intx_v = -intx_v;
 624   }
 625   if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
 626     return true;
 627   }
 628   uintx uintx_v = (uintx) v;
 629   if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
 630     return true;
 631   }
 632   uint64_t uint64_t_v = (uint64_t) v;
 633   if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
 634     return true;
 635   }
 636   size_t size_t_v = (size_t) v;
 637   if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
 638     return true;
 639   }
 640   return false;
 641 }
 642 
 643 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 644   if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
 645   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 646   FREE_C_HEAP_ARRAY(char, value);
 647   return true;
 648 }
 649 
 650 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 651   const char* old_value = "";
 652   if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
 653   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 654   size_t new_len = strlen(new_value);
 655   const char* value;
 656   char* free_this_too = NULL;
 657   if (old_len == 0) {
 658     value = new_value;
 659   } else if (new_len == 0) {
 660     value = old_value;
 661   } else {
 662     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 663     // each new setting adds another LINE to the switch:
 664     sprintf(buf, "%s\n%s", old_value, new_value);
 665     value = buf;
 666     free_this_too = buf;
 667   }
 668   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 669   // CommandLineFlags always returns a pointer that needs freeing.
 670   FREE_C_HEAP_ARRAY(char, value);
 671   if (free_this_too != NULL) {
 672     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 673     FREE_C_HEAP_ARRAY(char, free_this_too);
 674   }
 675   return true;
 676 }
 677 
 678 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 679 
 680   // range of acceptable characters spelled out for portability reasons
 681 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 682 #define BUFLEN 255
 683   char name[BUFLEN+1];
 684   char dummy;
 685 
 686   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 687     return set_bool_flag(name, false, origin);
 688   }
 689   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 690     return set_bool_flag(name, true, origin);
 691   }
 692 
 693   char punct;
 694   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 695     const char* value = strchr(arg, '=') + 1;
 696     Flag* flag = Flag::find_flag(name, strlen(name));
 697     if (flag != NULL && flag->is_ccstr()) {
 698       if (flag->ccstr_accumulates()) {
 699         return append_to_string_flag(name, value, origin);
 700       } else {
 701         if (value[0] == '\0') {
 702           value = NULL;
 703         }
 704         return set_string_flag(name, value, origin);
 705       }
 706     }
 707   }
 708 
 709   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 710     const char* value = strchr(arg, '=') + 1;
 711     // -XX:Foo:=xxx will reset the string flag to the given value.
 712     if (value[0] == '\0') {
 713       value = NULL;
 714     }
 715     return set_string_flag(name, value, origin);
 716   }
 717 
 718 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 719 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 720 #define        NUMBER_RANGE    "[0123456789]"
 721   char value[BUFLEN + 1];
 722   char value2[BUFLEN + 1];
 723   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 724     // Looks like a floating-point number -- try again with more lenient format string
 725     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 726       return set_fp_numeric_flag(name, value, origin);
 727     }
 728   }
 729 
 730 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 731   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 732     return set_numeric_flag(name, value, origin);
 733   }
 734 
 735   return false;
 736 }
 737 
 738 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 739   assert(bldarray != NULL, "illegal argument");
 740 
 741   if (arg == NULL) {
 742     return;
 743   }
 744 
 745   int new_count = *count + 1;
 746 
 747   // expand the array and add arg to the last element
 748   if (*bldarray == NULL) {
 749     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 750   } else {
 751     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 752   }
 753   (*bldarray)[*count] = os::strdup_check_oom(arg);
 754   *count = new_count;
 755 }
 756 
 757 void Arguments::build_jvm_args(const char* arg) {
 758   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 759 }
 760 
 761 void Arguments::build_jvm_flags(const char* arg) {
 762   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 763 }
 764 
 765 // utility function to return a string that concatenates all
 766 // strings in a given char** array
 767 const char* Arguments::build_resource_string(char** args, int count) {
 768   if (args == NULL || count == 0) {
 769     return NULL;
 770   }
 771   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 772   for (int i = 1; i < count; i++) {
 773     length += strlen(args[i]) + 1; // add 1 for a space
 774   }
 775   char* s = NEW_RESOURCE_ARRAY(char, length);
 776   strcpy(s, args[0]);
 777   for (int j = 1; j < count; j++) {
 778     strcat(s, " ");
 779     strcat(s, args[j]);
 780   }
 781   return (const char*) s;
 782 }
 783 
 784 void Arguments::print_on(outputStream* st) {
 785   st->print_cr("VM Arguments:");
 786   if (num_jvm_flags() > 0) {
 787     st->print("jvm_flags: "); print_jvm_flags_on(st);
 788   }
 789   if (num_jvm_args() > 0) {
 790     st->print("jvm_args: "); print_jvm_args_on(st);
 791   }
 792   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 793   if (_java_class_path != NULL) {
 794     char* path = _java_class_path->value();
 795     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 796   }
 797   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 798 }
 799 
 800 void Arguments::print_jvm_flags_on(outputStream* st) {
 801   if (_num_jvm_flags > 0) {
 802     for (int i=0; i < _num_jvm_flags; i++) {
 803       st->print("%s ", _jvm_flags_array[i]);
 804     }
 805     st->cr();
 806   }
 807 }
 808 
 809 void Arguments::print_jvm_args_on(outputStream* st) {
 810   if (_num_jvm_args > 0) {
 811     for (int i=0; i < _num_jvm_args; i++) {
 812       st->print("%s ", _jvm_args_array[i]);
 813     }
 814     st->cr();
 815   }
 816 }
 817 
 818 bool Arguments::process_argument(const char* arg,
 819     jboolean ignore_unrecognized, Flag::Flags origin) {
 820 
 821   JDK_Version since = JDK_Version();
 822 
 823   if (parse_argument(arg, origin) || ignore_unrecognized) {
 824     return true;
 825   }
 826 
 827   // Determine if the flag has '+', '-', or '=' characters.
 828   bool has_plus_minus = (*arg == '+' || *arg == '-');
 829   const char* const argname = has_plus_minus ? arg + 1 : arg;
 830 
 831   size_t arg_len;
 832   const char* equal_sign = strchr(argname, '=');
 833   if (equal_sign == NULL) {
 834     arg_len = strlen(argname);
 835   } else {
 836     arg_len = equal_sign - argname;
 837   }
 838 
 839   // Construct a string which consists only of the argument name without '+', '-', or '='.
 840   char stripped_argname[256];
 841   strncpy(stripped_argname, argname, arg_len);
 842   stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
 843 
 844   if (is_newly_obsolete(stripped_argname, &since)) {
 845     char version[256];
 846     since.to_string(version, sizeof(version));
 847     warning("ignoring option %s; support was removed in %s", stripped_argname, version);
 848     return true;
 849   }
 850 
 851   // For locked flags, report a custom error message if available.
 852   // Otherwise, report the standard unrecognized VM option.
 853   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 854   if (found_flag != NULL) {
 855     char locked_message_buf[BUFLEN];
 856     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 857     if (strlen(locked_message_buf) == 0) {
 858       if (found_flag->is_bool() && !has_plus_minus) {
 859         jio_fprintf(defaultStream::error_stream(),
 860           "Missing +/- setting for VM option '%s'\n", argname);
 861       } else if (!found_flag->is_bool() && has_plus_minus) {
 862         jio_fprintf(defaultStream::error_stream(),
 863           "Unexpected +/- setting in VM option '%s'\n", argname);
 864       } else {
 865         jio_fprintf(defaultStream::error_stream(),
 866           "Improperly specified VM option '%s'\n", argname);
 867       }
 868     } else {
 869       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 870     }
 871   } else {
 872     jio_fprintf(defaultStream::error_stream(),
 873                 "Unrecognized VM option '%s'\n", argname);
 874     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 875     if (fuzzy_matched != NULL) {
 876       jio_fprintf(defaultStream::error_stream(),
 877                   "Did you mean '%s%s%s'? ",
 878                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 879                   fuzzy_matched->_name,
 880                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 881     }
 882   }
 883 
 884   // allow for commandline "commenting out" options like -XX:#+Verbose
 885   return arg[0] == '#';
 886 }
 887 
 888 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 889   FILE* stream = fopen(file_name, "rb");
 890   if (stream == NULL) {
 891     if (should_exist) {
 892       jio_fprintf(defaultStream::error_stream(),
 893                   "Could not open settings file %s\n", file_name);
 894       return false;
 895     } else {
 896       return true;
 897     }
 898   }
 899 
 900   char token[1024];
 901   int  pos = 0;
 902 
 903   bool in_white_space = true;
 904   bool in_comment     = false;
 905   bool in_quote       = false;
 906   char quote_c        = 0;
 907   bool result         = true;
 908 
 909   int c = getc(stream);
 910   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 911     if (in_white_space) {
 912       if (in_comment) {
 913         if (c == '\n') in_comment = false;
 914       } else {
 915         if (c == '#') in_comment = true;
 916         else if (!isspace(c)) {
 917           in_white_space = false;
 918           token[pos++] = c;
 919         }
 920       }
 921     } else {
 922       if (c == '\n' || (!in_quote && isspace(c))) {
 923         // token ends at newline, or at unquoted whitespace
 924         // this allows a way to include spaces in string-valued options
 925         token[pos] = '\0';
 926         logOption(token);
 927         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 928         build_jvm_flags(token);
 929         pos = 0;
 930         in_white_space = true;
 931         in_quote = false;
 932       } else if (!in_quote && (c == '\'' || c == '"')) {
 933         in_quote = true;
 934         quote_c = c;
 935       } else if (in_quote && (c == quote_c)) {
 936         in_quote = false;
 937       } else {
 938         token[pos++] = c;
 939       }
 940     }
 941     c = getc(stream);
 942   }
 943   if (pos > 0) {
 944     token[pos] = '\0';
 945     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 946     build_jvm_flags(token);
 947   }
 948   fclose(stream);
 949   return result;
 950 }
 951 
 952 //=============================================================================================================
 953 // Parsing of properties (-D)
 954 
 955 const char* Arguments::get_property(const char* key) {
 956   return PropertyList_get_value(system_properties(), key);
 957 }
 958 
 959 bool Arguments::add_property(const char* prop) {
 960   const char* eq = strchr(prop, '=');
 961   char* key;
 962   // ns must be static--its address may be stored in a SystemProperty object.
 963   const static char ns[1] = {0};
 964   char* value = (char *)ns;
 965 
 966   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
 967   key = AllocateHeap(key_len + 1, mtInternal);
 968   strncpy(key, prop, key_len);
 969   key[key_len] = '\0';
 970 
 971   if (eq != NULL) {
 972     size_t value_len = strlen(prop) - key_len - 1;
 973     value = AllocateHeap(value_len + 1, mtInternal);
 974     strncpy(value, &prop[key_len + 1], value_len + 1);
 975   }
 976 
 977   if (strcmp(key, "java.compiler") == 0) {
 978     process_java_compiler_argument(value);
 979     FreeHeap(key);
 980     if (eq != NULL) {
 981       FreeHeap(value);
 982     }
 983     return true;
 984   } else if (strcmp(key, "sun.java.command") == 0) {
 985     _java_command = value;
 986 
 987     // Record value in Arguments, but let it get passed to Java.
 988   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
 989              strcmp(key, "sun.java.launcher.pid") == 0) {
 990     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
 991     // private and are processed in process_sun_java_launcher_properties();
 992     // the sun.java.launcher property is passed on to the java application
 993     FreeHeap(key);
 994     if (eq != NULL) {
 995       FreeHeap(value);
 996     }
 997     return true;
 998   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
 999     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1000     // its value without going through the property list or making a Java call.
1001     _java_vendor_url_bug = value;
1002   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1003     PropertyList_unique_add(&_system_properties, key, value, true);
1004     return true;
1005   }
1006   // Create new property and add at the end of the list
1007   PropertyList_unique_add(&_system_properties, key, value);
1008   return true;
1009 }
1010 
1011 //===========================================================================================================
1012 // Setting int/mixed/comp mode flags
1013 
1014 void Arguments::set_mode_flags(Mode mode) {
1015   // Set up default values for all flags.
1016   // If you add a flag to any of the branches below,
1017   // add a default value for it here.
1018   set_java_compiler(false);
1019   _mode                      = mode;
1020 
1021   // Ensure Agent_OnLoad has the correct initial values.
1022   // This may not be the final mode; mode may change later in onload phase.
1023   PropertyList_unique_add(&_system_properties, "java.vm.info",
1024                           (char*)VM_Version::vm_info_string(), false);
1025 
1026   UseInterpreter             = true;
1027   UseCompiler                = true;
1028   UseLoopCounter             = true;
1029 
1030   // Default values may be platform/compiler dependent -
1031   // use the saved values
1032   ClipInlining               = Arguments::_ClipInlining;
1033   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1034   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1035   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1036   if (TieredCompilation) {
1037     if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1038       Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1039     }
1040     if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1041       Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1042     }
1043   }
1044 
1045   // Change from defaults based on mode
1046   switch (mode) {
1047   default:
1048     ShouldNotReachHere();
1049     break;
1050   case _int:
1051     UseCompiler              = false;
1052     UseLoopCounter           = false;
1053     AlwaysCompileLoopMethods = false;
1054     UseOnStackReplacement    = false;
1055     break;
1056   case _mixed:
1057     // same as default
1058     break;
1059   case _comp:
1060     UseInterpreter           = false;
1061     BackgroundCompilation    = false;
1062     ClipInlining             = false;
1063     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1064     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1065     // compile a level 4 (C2) and then continue executing it.
1066     if (TieredCompilation) {
1067       Tier3InvokeNotifyFreqLog = 0;
1068       Tier4InvocationThreshold = 0;
1069     }
1070     break;
1071   }
1072 }
1073 
1074 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1075 // Conflict: required to use shared spaces (-Xshare:on), but
1076 // incompatible command line options were chosen.
1077 
1078 static void no_shared_spaces(const char* message) {
1079   if (RequireSharedSpaces) {
1080     jio_fprintf(defaultStream::error_stream(),
1081       "Class data sharing is inconsistent with other specified options.\n");
1082     vm_exit_during_initialization("Unable to use shared archive.", message);
1083   } else {
1084     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1085   }
1086 }
1087 #endif
1088 
1089 // Returns threshold scaled with the value of scale.
1090 // If scale < 0.0, threshold is returned without scaling.
1091 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1092   if (scale == 1.0 || scale < 0.0) {
1093     return threshold;
1094   } else {
1095     return (intx)(threshold * scale);
1096   }
1097 }
1098 
1099 // Returns freq_log scaled with the value of scale.
1100 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1101 // If scale < 0.0, freq_log is returned without scaling.
1102 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1103   // Check if scaling is necessary or if negative value was specified.
1104   if (scale == 1.0 || scale < 0.0) {
1105     return freq_log;
1106   }
1107   // Check values to avoid calculating log2 of 0.
1108   if (scale == 0.0 || freq_log == 0) {
1109     return 0;
1110   }
1111   // Determine the maximum notification frequency value currently supported.
1112   // The largest mask value that the interpreter/C1 can handle is
1113   // of length InvocationCounter::number_of_count_bits. Mask values are always
1114   // one bit shorter then the value of the notification frequency. Set
1115   // max_freq_bits accordingly.
1116   intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1117   intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1118   if (scaled_freq == 0) {
1119     // Return 0 right away to avoid calculating log2 of 0.
1120     return 0;
1121   } else if (scaled_freq > nth_bit(max_freq_bits)) {
1122     return max_freq_bits;
1123   } else {
1124     return log2_intptr(scaled_freq);
1125   }
1126 }
1127 
1128 void Arguments::set_tiered_flags() {
1129   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1130   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1131     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1132   }
1133   if (CompilationPolicyChoice < 2) {
1134     vm_exit_during_initialization(
1135       "Incompatible compilation policy selected", NULL);
1136   }
1137   // Increase the code cache size - tiered compiles a lot more.
1138   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1139     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1140                   MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1141   }
1142   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1143   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1144     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1145 
1146     if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1147       // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1148       if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1149         FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1150       }
1151       if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1152         FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1153       }
1154       // Check consistency of code heap sizes
1155       if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1156         jio_fprintf(defaultStream::error_stream(),
1157                     "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1158                     NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1159                     (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1160         vm_exit(1);
1161       }
1162     }
1163   }
1164   if (!UseInterpreter) { // -Xcomp
1165     Tier3InvokeNotifyFreqLog = 0;
1166     Tier4InvocationThreshold = 0;
1167   }
1168 
1169   if (CompileThresholdScaling < 0) {
1170     vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1171   }
1172 
1173   // Scale tiered compilation thresholds.
1174   // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1175   if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1176     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1177     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1178 
1179     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1180     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1181     FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1182     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1183 
1184     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1185     // once these thresholds become supported.
1186 
1187     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1188     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1189 
1190     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1191     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1192 
1193     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1194 
1195     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1196     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1197     FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1198     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1199   }
1200 }
1201 
1202 /**
1203  * Returns the minimum number of compiler threads needed to run the JVM. The following
1204  * configurations are possible.
1205  *
1206  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1207  *    compiler threads is 0.
1208  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1209  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1210  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1211  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1212  *    C1 can be used, so the minimum number of compiler threads is 1.
1213  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1214  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1215  *    the minimum number of compiler threads is 2.
1216  */
1217 int Arguments::get_min_number_of_compiler_threads() {
1218 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1219   return 0;   // case 1
1220 #else
1221   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1222     return 1; // case 2 or case 3
1223   }
1224   return 2;   // case 4 (tiered)
1225 #endif
1226 }
1227 
1228 #if INCLUDE_ALL_GCS
1229 static void disable_adaptive_size_policy(const char* collector_name) {
1230   if (UseAdaptiveSizePolicy) {
1231     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1232       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1233               collector_name);
1234     }
1235     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1236   }
1237 }
1238 
1239 void Arguments::set_parnew_gc_flags() {
1240   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1241          "control point invariant");
1242   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1243   assert(UseParNewGC, "ParNew should always be used with CMS");
1244 
1245   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1246     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1247     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1248   } else if (ParallelGCThreads == 0) {
1249     jio_fprintf(defaultStream::error_stream(),
1250         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1251     vm_exit(1);
1252   }
1253 
1254   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1255   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1256   // we set them to 1024 and 1024.
1257   // See CR 6362902.
1258   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1259     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1260   }
1261   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1262     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1263   }
1264 
1265   // When using compressed oops, we use local overflow stacks,
1266   // rather than using a global overflow list chained through
1267   // the klass word of the object's pre-image.
1268   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1269     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1270       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1271     }
1272     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1273   }
1274   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1275 }
1276 
1277 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1278 // sparc/solaris for certain applications, but would gain from
1279 // further optimization and tuning efforts, and would almost
1280 // certainly gain from analysis of platform and environment.
1281 void Arguments::set_cms_and_parnew_gc_flags() {
1282   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1283   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1284   assert(UseParNewGC, "ParNew should always be used with CMS");
1285 
1286   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1287   disable_adaptive_size_policy("UseConcMarkSweepGC");
1288 
1289   set_parnew_gc_flags();
1290 
1291   size_t max_heap = align_size_down(MaxHeapSize,
1292                                     CardTableRS::ct_max_alignment_constraint());
1293 
1294   // Now make adjustments for CMS
1295   intx   tenuring_default = (intx)6;
1296   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1297 
1298   // Preferred young gen size for "short" pauses:
1299   // upper bound depends on # of threads and NewRatio.
1300   const size_t preferred_max_new_size_unaligned =
1301     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1302   size_t preferred_max_new_size =
1303     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1304 
1305   // Unless explicitly requested otherwise, size young gen
1306   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1307 
1308   // If either MaxNewSize or NewRatio is set on the command line,
1309   // assume the user is trying to set the size of the young gen.
1310   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1311 
1312     // Set MaxNewSize to our calculated preferred_max_new_size unless
1313     // NewSize was set on the command line and it is larger than
1314     // preferred_max_new_size.
1315     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1316       FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1317     } else {
1318       FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1319     }
1320     if (PrintGCDetails && Verbose) {
1321       // Too early to use gclog_or_tty
1322       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1323     }
1324 
1325     // Code along this path potentially sets NewSize and OldSize
1326     if (PrintGCDetails && Verbose) {
1327       // Too early to use gclog_or_tty
1328       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1329            " initial_heap_size:  " SIZE_FORMAT
1330            " max_heap: " SIZE_FORMAT,
1331            min_heap_size(), InitialHeapSize, max_heap);
1332     }
1333     size_t min_new = preferred_max_new_size;
1334     if (FLAG_IS_CMDLINE(NewSize)) {
1335       min_new = NewSize;
1336     }
1337     if (max_heap > min_new && min_heap_size() > min_new) {
1338       // Unless explicitly requested otherwise, make young gen
1339       // at least min_new, and at most preferred_max_new_size.
1340       if (FLAG_IS_DEFAULT(NewSize)) {
1341         FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1342         FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1343         if (PrintGCDetails && Verbose) {
1344           // Too early to use gclog_or_tty
1345           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1346         }
1347       }
1348       // Unless explicitly requested otherwise, size old gen
1349       // so it's NewRatio x of NewSize.
1350       if (FLAG_IS_DEFAULT(OldSize)) {
1351         if (max_heap > NewSize) {
1352           FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1353           if (PrintGCDetails && Verbose) {
1354             // Too early to use gclog_or_tty
1355             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1356           }
1357         }
1358       }
1359     }
1360   }
1361   // Unless explicitly requested otherwise, definitely
1362   // promote all objects surviving "tenuring_default" scavenges.
1363   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1364       FLAG_IS_DEFAULT(SurvivorRatio)) {
1365     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1366   }
1367   // If we decided above (or user explicitly requested)
1368   // `promote all' (via MaxTenuringThreshold := 0),
1369   // prefer minuscule survivor spaces so as not to waste
1370   // space for (non-existent) survivors
1371   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1372     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1373   }
1374 
1375   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1376   // but rather the number of free blocks of a given size that are used when
1377   // replenishing the local per-worker free list caches.
1378   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1379     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1380       // OldPLAB sizing manually turned off: Use a larger default setting,
1381       // unless it was manually specified. This is because a too-low value
1382       // will slow down scavenges.
1383       FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1384     } else {
1385       FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1386     }
1387   }
1388 
1389   // If either of the static initialization defaults have changed, note this
1390   // modification.
1391   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1392     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1393   }
1394 
1395   if (!ClassUnloading) {
1396     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1397     FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1398   }
1399 
1400   if (PrintGCDetails && Verbose) {
1401     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1402       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1403     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1404   }
1405 }
1406 #endif // INCLUDE_ALL_GCS
1407 
1408 void set_object_alignment() {
1409   // Object alignment.
1410   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1411   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1412   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1413   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1414   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1415   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1416 
1417   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1418   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1419 
1420   // Oop encoding heap max
1421   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1422 
1423   if (SurvivorAlignmentInBytes == 0) {
1424     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1425   }
1426 
1427 #if INCLUDE_ALL_GCS
1428   // Set CMS global values
1429   CompactibleFreeListSpace::set_cms_values();
1430 #endif // INCLUDE_ALL_GCS
1431 }
1432 
1433 size_t Arguments::max_heap_for_compressed_oops() {
1434   // Avoid sign flip.
1435   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1436   // We need to fit both the NULL page and the heap into the memory budget, while
1437   // keeping alignment constraints of the heap. To guarantee the latter, as the
1438   // NULL page is located before the heap, we pad the NULL page to the conservative
1439   // maximum alignment that the GC may ever impose upon the heap.
1440   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1441                                                         _conservative_max_heap_alignment);
1442 
1443   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1444   NOT_LP64(ShouldNotReachHere(); return 0);
1445 }
1446 
1447 bool Arguments::should_auto_select_low_pause_collector() {
1448   if (UseAutoGCSelectPolicy &&
1449       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1450       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1451     if (PrintGCDetails) {
1452       // Cannot use gclog_or_tty yet.
1453       tty->print_cr("Automatic selection of the low pause collector"
1454        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1455     }
1456     return true;
1457   }
1458   return false;
1459 }
1460 
1461 void Arguments::set_use_compressed_oops() {
1462 #ifndef ZERO
1463 #ifdef _LP64
1464   // MaxHeapSize is not set up properly at this point, but
1465   // the only value that can override MaxHeapSize if we are
1466   // to use UseCompressedOops is InitialHeapSize.
1467   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1468 
1469   if (max_heap_size <= max_heap_for_compressed_oops()) {
1470 #if !defined(COMPILER1) || defined(TIERED)
1471     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1472       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1473     }
1474 #endif
1475   } else {
1476     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1477       warning("Max heap size too large for Compressed Oops");
1478       FLAG_SET_DEFAULT(UseCompressedOops, false);
1479       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1480     }
1481   }
1482 #endif // _LP64
1483 #endif // ZERO
1484 }
1485 
1486 
1487 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1488 // set_use_compressed_oops().
1489 void Arguments::set_use_compressed_klass_ptrs() {
1490 #ifndef ZERO
1491 #ifdef _LP64
1492   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1493   if (!UseCompressedOops) {
1494     if (UseCompressedClassPointers) {
1495       warning("UseCompressedClassPointers requires UseCompressedOops");
1496     }
1497     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1498   } else {
1499     // Turn on UseCompressedClassPointers too
1500     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1501       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1502     }
1503     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1504     if (UseCompressedClassPointers) {
1505       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1506         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1507         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1508       }
1509     }
1510   }
1511 #endif // _LP64
1512 #endif // !ZERO
1513 }
1514 
1515 void Arguments::set_conservative_max_heap_alignment() {
1516   // The conservative maximum required alignment for the heap is the maximum of
1517   // the alignments imposed by several sources: any requirements from the heap
1518   // itself, the collector policy and the maximum page size we may run the VM
1519   // with.
1520   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1521 #if INCLUDE_ALL_GCS
1522   if (UseParallelGC) {
1523     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1524   } else if (UseG1GC) {
1525     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1526   }
1527 #endif // INCLUDE_ALL_GCS
1528   _conservative_max_heap_alignment = MAX4(heap_alignment,
1529                                           (size_t)os::vm_allocation_granularity(),
1530                                           os::max_page_size(),
1531                                           CollectorPolicy::compute_heap_alignment());
1532 }
1533 
1534 void Arguments::select_gc_ergonomically() {
1535   if (os::is_server_class_machine()) {
1536     if (should_auto_select_low_pause_collector()) {
1537       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1538     } else {
1539 #if defined(JAVASE_EMBEDDED)
1540       FLAG_SET_ERGO(bool, UseParallelGC, true);
1541 #else
1542       FLAG_SET_ERGO(bool, UseG1GC, true);
1543 #endif
1544     }
1545   } else {
1546     FLAG_SET_ERGO(bool, UseSerialGC, true);
1547   }
1548 }
1549 
1550 void Arguments::select_gc() {
1551   if (!gc_selected()) {
1552     select_gc_ergonomically();
1553     guarantee(gc_selected(), "No GC selected");
1554   }
1555 }
1556 
1557 void Arguments::set_ergonomics_flags() {
1558   select_gc();
1559 
1560 #ifdef COMPILER2
1561   // Shared spaces work fine with other GCs but causes bytecode rewriting
1562   // to be disabled, which hurts interpreter performance and decreases
1563   // server performance.  When -server is specified, keep the default off
1564   // unless it is asked for.  Future work: either add bytecode rewriting
1565   // at link time, or rewrite bytecodes in non-shared methods.
1566   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1567       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1568     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1569   }
1570 #endif
1571 
1572   set_conservative_max_heap_alignment();
1573 
1574 #ifndef ZERO
1575 #ifdef _LP64
1576   set_use_compressed_oops();
1577 
1578   // set_use_compressed_klass_ptrs() must be called after calling
1579   // set_use_compressed_oops().
1580   set_use_compressed_klass_ptrs();
1581 
1582   // Also checks that certain machines are slower with compressed oops
1583   // in vm_version initialization code.
1584 #endif // _LP64
1585 #endif // !ZERO
1586 
1587   // Set up runtime image flags.
1588   set_runtime_image_flags();
1589 }
1590 
1591 void Arguments::set_parallel_gc_flags() {
1592   assert(UseParallelGC || UseParallelOldGC, "Error");
1593   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1594   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1595     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1596   }
1597   FLAG_SET_DEFAULT(UseParallelGC, true);
1598 
1599   // If no heap maximum was requested explicitly, use some reasonable fraction
1600   // of the physical memory, up to a maximum of 1GB.
1601   FLAG_SET_DEFAULT(ParallelGCThreads,
1602                    Abstract_VM_Version::parallel_worker_threads());
1603   if (ParallelGCThreads == 0) {
1604     jio_fprintf(defaultStream::error_stream(),
1605         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1606     vm_exit(1);
1607   }
1608 
1609   if (UseAdaptiveSizePolicy) {
1610     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1611     // unless the user actually sets these flags.
1612     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1613       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1614       _min_heap_free_ratio = MinHeapFreeRatio;
1615     }
1616     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1617       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1618       _max_heap_free_ratio = MaxHeapFreeRatio;
1619     }
1620   }
1621 
1622   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1623   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1624   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1625   // See CR 6362902 for details.
1626   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1627     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1628        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1629     }
1630     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1631       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1632     }
1633   }
1634 
1635   if (UseParallelOldGC) {
1636     // Par compact uses lower default values since they are treated as
1637     // minimums.  These are different defaults because of the different
1638     // interpretation and are not ergonomically set.
1639     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1640       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1641     }
1642   }
1643 }
1644 
1645 void Arguments::set_g1_gc_flags() {
1646   assert(UseG1GC, "Error");
1647 #ifdef COMPILER1
1648   FastTLABRefill = false;
1649 #endif
1650   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1651   if (ParallelGCThreads == 0) {
1652     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1653     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1654   }
1655 
1656 #if INCLUDE_ALL_GCS
1657   if (G1ConcRefinementThreads == 0) {
1658     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1659   }
1660 #endif
1661 
1662   // MarkStackSize will be set (if it hasn't been set by the user)
1663   // when concurrent marking is initialized.
1664   // Its value will be based upon the number of parallel marking threads.
1665   // But we do set the maximum mark stack size here.
1666   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1667     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1668   }
1669 
1670   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1671     // In G1, we want the default GC overhead goal to be higher than
1672     // say in PS. So we set it here to 10%. Otherwise the heap might
1673     // be expanded more aggressively than we would like it to. In
1674     // fact, even 10% seems to not be high enough in some cases
1675     // (especially small GC stress tests that the main thing they do
1676     // is allocation). We might consider increase it further.
1677     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1678   }
1679 
1680   if (PrintGCDetails && Verbose) {
1681     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1682       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1683     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1684   }
1685 }
1686 
1687 #if !INCLUDE_ALL_GCS
1688 #ifdef ASSERT
1689 static bool verify_serial_gc_flags() {
1690   return (UseSerialGC &&
1691         !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1692           UseParallelGC || UseParallelOldGC));
1693 }
1694 #endif // ASSERT
1695 #endif // INCLUDE_ALL_GCS
1696 
1697 void Arguments::set_gc_specific_flags() {
1698 #if INCLUDE_ALL_GCS
1699   // Set per-collector flags
1700   if (UseParallelGC || UseParallelOldGC) {
1701     set_parallel_gc_flags();
1702   } else if (UseConcMarkSweepGC) {
1703     set_cms_and_parnew_gc_flags();
1704   } else if (UseG1GC) {
1705     set_g1_gc_flags();
1706   }
1707   check_deprecated_gc_flags();
1708   if (AssumeMP && !UseSerialGC) {
1709     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1710       warning("If the number of processors is expected to increase from one, then"
1711               " you should configure the number of parallel GC threads appropriately"
1712               " using -XX:ParallelGCThreads=N");
1713     }
1714   }
1715   if (MinHeapFreeRatio == 100) {
1716     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1717     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1718   }
1719 #else // INCLUDE_ALL_GCS
1720   assert(verify_serial_gc_flags(), "SerialGC unset");
1721 #endif // INCLUDE_ALL_GCS
1722 }
1723 
1724 julong Arguments::limit_by_allocatable_memory(julong limit) {
1725   julong max_allocatable;
1726   julong result = limit;
1727   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1728     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1729   }
1730   return result;
1731 }
1732 
1733 // Use static initialization to get the default before parsing
1734 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1735 
1736 void Arguments::set_heap_size() {
1737   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1738     // Deprecated flag
1739     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1740   }
1741 
1742   const julong phys_mem =
1743     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1744                             : (julong)MaxRAM;
1745 
1746   // If the maximum heap size has not been set with -Xmx,
1747   // then set it as fraction of the size of physical memory,
1748   // respecting the maximum and minimum sizes of the heap.
1749   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1750     julong reasonable_max = phys_mem / MaxRAMFraction;
1751 
1752     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1753       // Small physical memory, so use a minimum fraction of it for the heap
1754       reasonable_max = phys_mem / MinRAMFraction;
1755     } else {
1756       // Not-small physical memory, so require a heap at least
1757       // as large as MaxHeapSize
1758       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1759     }
1760     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1761       // Limit the heap size to ErgoHeapSizeLimit
1762       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1763     }
1764     if (UseCompressedOops) {
1765       // Limit the heap size to the maximum possible when using compressed oops
1766       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1767 
1768       // HeapBaseMinAddress can be greater than default but not less than.
1769       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1770         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1771           // matches compressed oops printing flags
1772           if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1773             jio_fprintf(defaultStream::error_stream(),
1774                         "HeapBaseMinAddress must be at least " SIZE_FORMAT
1775                         " (" SIZE_FORMAT "G) which is greater than value given "
1776                         SIZE_FORMAT "\n",
1777                         DefaultHeapBaseMinAddress,
1778                         DefaultHeapBaseMinAddress/G,
1779                         HeapBaseMinAddress);
1780           }
1781           FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1782         }
1783       }
1784 
1785       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1786         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1787         // but it should be not less than default MaxHeapSize.
1788         max_coop_heap -= HeapBaseMinAddress;
1789       }
1790       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1791     }
1792     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1793 
1794     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1795       // An initial heap size was specified on the command line,
1796       // so be sure that the maximum size is consistent.  Done
1797       // after call to limit_by_allocatable_memory because that
1798       // method might reduce the allocation size.
1799       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1800     }
1801 
1802     if (PrintGCDetails && Verbose) {
1803       // Cannot use gclog_or_tty yet.
1804       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1805     }
1806     FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1807   }
1808 
1809   // If the minimum or initial heap_size have not been set or requested to be set
1810   // ergonomically, set them accordingly.
1811   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1812     julong reasonable_minimum = (julong)(OldSize + NewSize);
1813 
1814     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1815 
1816     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1817 
1818     if (InitialHeapSize == 0) {
1819       julong reasonable_initial = phys_mem / InitialRAMFraction;
1820 
1821       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1822       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1823 
1824       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1825 
1826       if (PrintGCDetails && Verbose) {
1827         // Cannot use gclog_or_tty yet.
1828         tty->print_cr("  Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1829       }
1830       FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1831     }
1832     // If the minimum heap size has not been set (via -Xms),
1833     // synchronize with InitialHeapSize to avoid errors with the default value.
1834     if (min_heap_size() == 0) {
1835       set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1836       if (PrintGCDetails && Verbose) {
1837         // Cannot use gclog_or_tty yet.
1838         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1839       }
1840     }
1841   }
1842 }
1843 
1844   // Set up runtime image flags
1845 void Arguments::set_runtime_image_flags() {
1846 #ifdef _LP64
1847   // Memory map image file by default on 64 bit machines.
1848   if (FLAG_IS_DEFAULT(MemoryMapImage)) {
1849     FLAG_SET_ERGO(bool, MemoryMapImage, true);
1850   }
1851 #endif
1852 }
1853 
1854 // This must be called after ergonomics.
1855 void Arguments::set_bytecode_flags() {
1856   if (!RewriteBytecodes) {
1857     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1858   }
1859 }
1860 
1861 // Aggressive optimization flags  -XX:+AggressiveOpts
1862 void Arguments::set_aggressive_opts_flags() {
1863 #ifdef COMPILER2
1864   if (AggressiveUnboxing) {
1865     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1866       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1867     } else if (!EliminateAutoBox) {
1868       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1869       AggressiveUnboxing = false;
1870     }
1871     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1872       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1873     } else if (!DoEscapeAnalysis) {
1874       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1875       AggressiveUnboxing = false;
1876     }
1877   }
1878   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1879     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1880       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1881     }
1882     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1883       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1884     }
1885 
1886     // Feed the cache size setting into the JDK
1887     char buffer[1024];
1888     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1889     add_property(buffer);
1890   }
1891   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1892     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1893   }
1894 #endif
1895 
1896   if (AggressiveOpts) {
1897 // Sample flag setting code
1898 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1899 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1900 //    }
1901   }
1902 }
1903 
1904 //===========================================================================================================
1905 // Parsing of java.compiler property
1906 
1907 void Arguments::process_java_compiler_argument(char* arg) {
1908   // For backwards compatibility, Djava.compiler=NONE or ""
1909   // causes us to switch to -Xint mode UNLESS -Xdebug
1910   // is also specified.
1911   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1912     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1913   }
1914 }
1915 
1916 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1917   _sun_java_launcher = os::strdup_check_oom(launcher);
1918 }
1919 
1920 bool Arguments::created_by_java_launcher() {
1921   assert(_sun_java_launcher != NULL, "property must have value");
1922   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1923 }
1924 
1925 bool Arguments::sun_java_launcher_is_altjvm() {
1926   return _sun_java_launcher_is_altjvm;
1927 }
1928 
1929 //===========================================================================================================
1930 // Parsing of main arguments
1931 
1932 // check if do gclog rotation
1933 // +UseGCLogFileRotation is a must,
1934 // no gc log rotation when log file not supplied or
1935 // NumberOfGCLogFiles is 0
1936 void check_gclog_consistency() {
1937   if (UseGCLogFileRotation) {
1938     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1939       jio_fprintf(defaultStream::output_stream(),
1940                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1941                   "where num_of_file > 0\n"
1942                   "GC log rotation is turned off\n");
1943       UseGCLogFileRotation = false;
1944     }
1945   }
1946 
1947   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1948     if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
1949       jio_fprintf(defaultStream::output_stream(),
1950                 "GCLogFileSize changed to minimum 8K\n");
1951     }
1952   }
1953 }
1954 
1955 // This function is called for -Xloggc:<filename>, it can be used
1956 // to check if a given file name(or string) conforms to the following
1957 // specification:
1958 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1959 // %p and %t only allowed once. We only limit usage of filename not path
1960 bool is_filename_valid(const char *file_name) {
1961   const char* p = file_name;
1962   char file_sep = os::file_separator()[0];
1963   const char* cp;
1964   // skip prefix path
1965   for (cp = file_name; *cp != '\0'; cp++) {
1966     if (*cp == '/' || *cp == file_sep) {
1967       p = cp + 1;
1968     }
1969   }
1970 
1971   int count_p = 0;
1972   int count_t = 0;
1973   while (*p != '\0') {
1974     if ((*p >= '0' && *p <= '9') ||
1975         (*p >= 'A' && *p <= 'Z') ||
1976         (*p >= 'a' && *p <= 'z') ||
1977          *p == '-'               ||
1978          *p == '_'               ||
1979          *p == '.') {
1980        p++;
1981        continue;
1982     }
1983     if (*p == '%') {
1984       if(*(p + 1) == 'p') {
1985         p += 2;
1986         count_p ++;
1987         continue;
1988       }
1989       if (*(p + 1) == 't') {
1990         p += 2;
1991         count_t ++;
1992         continue;
1993       }
1994     }
1995     return false;
1996   }
1997   return count_p < 2 && count_t < 2;
1998 }
1999 
2000 // Check consistency of GC selection
2001 bool Arguments::check_gc_consistency() {
2002   check_gclog_consistency();
2003   // Ensure that the user has not selected conflicting sets
2004   // of collectors.
2005   uint i = 0;
2006   if (UseSerialGC)                       i++;
2007   if (UseConcMarkSweepGC)                i++;
2008   if (UseParallelGC || UseParallelOldGC) i++;
2009   if (UseG1GC)                           i++;
2010   if (i > 1) {
2011     jio_fprintf(defaultStream::error_stream(),
2012                 "Conflicting collector combinations in option list; "
2013                 "please refer to the release notes for the combinations "
2014                 "allowed\n");
2015     return false;
2016   }
2017 
2018   if (UseConcMarkSweepGC && !UseParNewGC) {
2019     jio_fprintf(defaultStream::error_stream(),
2020         "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2021     return false;
2022   }
2023 
2024   if (UseParNewGC && !UseConcMarkSweepGC) {
2025     jio_fprintf(defaultStream::error_stream(),
2026         "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2027     return false;
2028   }
2029 
2030   return true;
2031 }
2032 
2033 void Arguments::check_deprecated_gc_flags() {
2034   if (FLAG_IS_CMDLINE(UseParNewGC)) {
2035     warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2036   }
2037   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2038     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2039             "and will likely be removed in future release");
2040   }
2041   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2042     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2043         "Use MaxRAMFraction instead.");
2044   }
2045 }
2046 
2047 // Check the consistency of vm_init_args
2048 bool Arguments::check_vm_args_consistency() {
2049   // Method for adding checks for flag consistency.
2050   // The intent is to warn the user of all possible conflicts,
2051   // before returning an error.
2052   // Note: Needs platform-dependent factoring.
2053   bool status = true;
2054 
2055   if (TLABRefillWasteFraction == 0) {
2056     jio_fprintf(defaultStream::error_stream(),
2057                 "TLABRefillWasteFraction should be a denominator, "
2058                 "not " SIZE_FORMAT "\n",
2059                 TLABRefillWasteFraction);
2060     status = false;
2061   }
2062 
2063   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2064     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2065   }
2066 
2067   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2068     // Settings to encourage splitting.
2069     if (!FLAG_IS_CMDLINE(NewRatio)) {
2070       if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2071         status = false;
2072       }
2073     }
2074     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2075       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2076         status = false;
2077       }
2078     }
2079   }
2080 
2081   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2082     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2083   }
2084 
2085   if (GCTimeLimit == 100) {
2086     // Turn off gc-overhead-limit-exceeded checks
2087     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2088   }
2089 
2090   status = status && check_gc_consistency();
2091 
2092   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2093   // insists that we hold the requisite locks so that the iteration is
2094   // MT-safe. For the verification at start-up and shut-down, we don't
2095   // yet have a good way of acquiring and releasing these locks,
2096   // which are not visible at the CollectedHeap level. We want to
2097   // be able to acquire these locks and then do the iteration rather
2098   // than just disable the lock verification. This will be fixed under
2099   // bug 4788986.
2100   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2101     if (VerifyDuringStartup) {
2102       warning("Heap verification at start-up disabled "
2103               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2104       VerifyDuringStartup = false; // Disable verification at start-up
2105     }
2106 
2107     if (VerifyBeforeExit) {
2108       warning("Heap verification at shutdown disabled "
2109               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2110       VerifyBeforeExit = false; // Disable verification at shutdown
2111     }
2112   }
2113 
2114   // Note: only executed in non-PRODUCT mode
2115   if (!UseAsyncConcMarkSweepGC &&
2116       (ExplicitGCInvokesConcurrent ||
2117        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2118     jio_fprintf(defaultStream::error_stream(),
2119                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2120                 " with -UseAsyncConcMarkSweepGC");
2121     status = false;
2122   }
2123 
2124   if (PrintNMTStatistics) {
2125 #if INCLUDE_NMT
2126     if (MemTracker::tracking_level() == NMT_off) {
2127 #endif // INCLUDE_NMT
2128       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2129       PrintNMTStatistics = false;
2130 #if INCLUDE_NMT
2131     }
2132 #endif
2133   }
2134 
2135   // Check lower bounds of the code cache
2136   // Template Interpreter code is approximately 3X larger in debug builds.
2137   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2138   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2139     jio_fprintf(defaultStream::error_stream(),
2140                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2141                 os::vm_page_size()/K);
2142     status = false;
2143   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2144     jio_fprintf(defaultStream::error_stream(),
2145                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2146                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2147     status = false;
2148   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2149     jio_fprintf(defaultStream::error_stream(),
2150                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2151                 min_code_cache_size/K);
2152     status = false;
2153   } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2154     // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2155     jio_fprintf(defaultStream::error_stream(),
2156                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2157                 CODE_CACHE_SIZE_LIMIT/M);
2158     status = false;
2159   } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2160     jio_fprintf(defaultStream::error_stream(),
2161                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2162                 min_code_cache_size/K);
2163     status = false;
2164   } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2165              && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2166     jio_fprintf(defaultStream::error_stream(),
2167                 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2168                 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2169                 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2170     status = false;
2171   }
2172 
2173   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2174   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2175   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2176 
2177   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2178     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2179   }
2180 
2181   return status;
2182 }
2183 
2184 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2185   const char* option_type) {
2186   if (ignore) return false;
2187 
2188   const char* spacer = " ";
2189   if (option_type == NULL) {
2190     option_type = ++spacer; // Set both to the empty string.
2191   }
2192 
2193   if (os::obsolete_option(option)) {
2194     jio_fprintf(defaultStream::error_stream(),
2195                 "Obsolete %s%soption: %s\n", option_type, spacer,
2196       option->optionString);
2197     return false;
2198   } else {
2199     jio_fprintf(defaultStream::error_stream(),
2200                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2201       option->optionString);
2202     return true;
2203   }
2204 }
2205 
2206 static const char* user_assertion_options[] = {
2207   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2208 };
2209 
2210 static const char* system_assertion_options[] = {
2211   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2212 };
2213 
2214 bool Arguments::parse_uintx(const char* value,
2215                             uintx* uintx_arg,
2216                             uintx min_size) {
2217 
2218   // Check the sign first since atomull() parses only unsigned values.
2219   bool value_is_positive = !(*value == '-');
2220 
2221   if (value_is_positive) {
2222     julong n;
2223     bool good_return = atomull(value, &n);
2224     if (good_return) {
2225       bool above_minimum = n >= min_size;
2226       bool value_is_too_large = n > max_uintx;
2227 
2228       if (above_minimum && !value_is_too_large) {
2229         *uintx_arg = n;
2230         return true;
2231       }
2232     }
2233   }
2234   return false;
2235 }
2236 
2237 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2238                                                   julong* long_arg,
2239                                                   julong min_size) {
2240   if (!atomull(s, long_arg)) return arg_unreadable;
2241   return check_memory_size(*long_arg, min_size);
2242 }
2243 
2244 // Parse JavaVMInitArgs structure
2245 
2246 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2247   // For components of the system classpath.
2248   SysClassPath scp(Arguments::get_sysclasspath());
2249   bool scp_assembly_required = false;
2250 
2251   // Save default settings for some mode flags
2252   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2253   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2254   Arguments::_ClipInlining             = ClipInlining;
2255   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2256   if (TieredCompilation) {
2257     Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2258     Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2259   }
2260 
2261   // Setup flags for mixed which is the default
2262   set_mode_flags(_mixed);
2263 
2264   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2265   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2266   if (result != JNI_OK) {
2267     return result;
2268   }
2269 
2270   // Parse JavaVMInitArgs structure passed in
2271   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2272   if (result != JNI_OK) {
2273     return result;
2274   }
2275 
2276   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2277   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2278   if (result != JNI_OK) {
2279     return result;
2280   }
2281 
2282   // Do final processing now that all arguments have been parsed
2283   result = finalize_vm_init_args(&scp, scp_assembly_required);
2284   if (result != JNI_OK) {
2285     return result;
2286   }
2287 
2288   return JNI_OK;
2289 }
2290 
2291 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2292 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2293 // are dealing with -agentpath (case where name is a path), otherwise with
2294 // -agentlib
2295 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2296   char *_name;
2297   const char *_hprof = "hprof", *_jdwp = "jdwp";
2298   size_t _len_hprof, _len_jdwp, _len_prefix;
2299 
2300   if (is_path) {
2301     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2302       return false;
2303     }
2304 
2305     _name++;  // skip past last path separator
2306     _len_prefix = strlen(JNI_LIB_PREFIX);
2307 
2308     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2309       return false;
2310     }
2311 
2312     _name += _len_prefix;
2313     _len_hprof = strlen(_hprof);
2314     _len_jdwp = strlen(_jdwp);
2315 
2316     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2317       _name += _len_hprof;
2318     }
2319     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2320       _name += _len_jdwp;
2321     }
2322     else {
2323       return false;
2324     }
2325 
2326     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2327       return false;
2328     }
2329 
2330     return true;
2331   }
2332 
2333   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2334     return true;
2335   }
2336 
2337   return false;
2338 }
2339 
2340 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2341                                        SysClassPath* scp_p,
2342                                        bool* scp_assembly_required_p,
2343                                        Flag::Flags origin) {
2344   // Remaining part of option string
2345   const char* tail;
2346 
2347   // iterate over arguments
2348   for (int index = 0; index < args->nOptions; index++) {
2349     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2350 
2351     const JavaVMOption* option = args->options + index;
2352 
2353     if (!match_option(option, "-Djava.class.path", &tail) &&
2354         !match_option(option, "-Dsun.java.command", &tail) &&
2355         !match_option(option, "-Dsun.java.launcher", &tail)) {
2356 
2357         // add all jvm options to the jvm_args string. This string
2358         // is used later to set the java.vm.args PerfData string constant.
2359         // the -Djava.class.path and the -Dsun.java.command options are
2360         // omitted from jvm_args string as each have their own PerfData
2361         // string constant object.
2362         build_jvm_args(option->optionString);
2363     }
2364 
2365     // -verbose:[class/gc/jni]
2366     if (match_option(option, "-verbose", &tail)) {
2367       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2368         if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2369           return JNI_EINVAL;
2370         }
2371         if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2372           return JNI_EINVAL;
2373         }
2374       } else if (!strcmp(tail, ":gc")) {
2375         if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2376           return JNI_EINVAL;
2377         }
2378       } else if (!strcmp(tail, ":jni")) {
2379         if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2380           return JNI_EINVAL;
2381         }
2382       }
2383     // -da / -ea / -disableassertions / -enableassertions
2384     // These accept an optional class/package name separated by a colon, e.g.,
2385     // -da:java.lang.Thread.
2386     } else if (match_option(option, user_assertion_options, &tail, true)) {
2387       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2388       if (*tail == '\0') {
2389         JavaAssertions::setUserClassDefault(enable);
2390       } else {
2391         assert(*tail == ':', "bogus match by match_option()");
2392         JavaAssertions::addOption(tail + 1, enable);
2393       }
2394     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2395     } else if (match_option(option, system_assertion_options, &tail, false)) {
2396       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2397       JavaAssertions::setSystemClassDefault(enable);
2398     // -bootclasspath:
2399     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2400       scp_p->reset_path(tail);
2401       *scp_assembly_required_p = true;
2402     // -bootclasspath/a:
2403     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2404       scp_p->add_suffix(tail);
2405       *scp_assembly_required_p = true;
2406     // -bootclasspath/p:
2407     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2408       scp_p->add_prefix(tail);
2409       *scp_assembly_required_p = true;
2410     // -Xrun
2411     } else if (match_option(option, "-Xrun", &tail)) {
2412       if (tail != NULL) {
2413         const char* pos = strchr(tail, ':');
2414         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2415         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2416         name[len] = '\0';
2417 
2418         char *options = NULL;
2419         if(pos != NULL) {
2420           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2421           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2422         }
2423 #if !INCLUDE_JVMTI
2424         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2425           jio_fprintf(defaultStream::error_stream(),
2426             "Profiling and debugging agents are not supported in this VM\n");
2427           return JNI_ERR;
2428         }
2429 #endif // !INCLUDE_JVMTI
2430         add_init_library(name, options);
2431       }
2432     // -agentlib and -agentpath
2433     } else if (match_option(option, "-agentlib:", &tail) ||
2434           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2435       if(tail != NULL) {
2436         const char* pos = strchr(tail, '=');
2437         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2438         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2439         name[len] = '\0';
2440 
2441         char *options = NULL;
2442         if(pos != NULL) {
2443           options = os::strdup_check_oom(pos + 1, mtInternal);
2444         }
2445 #if !INCLUDE_JVMTI
2446         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2447           jio_fprintf(defaultStream::error_stream(),
2448             "Profiling and debugging agents are not supported in this VM\n");
2449           return JNI_ERR;
2450         }
2451 #endif // !INCLUDE_JVMTI
2452         add_init_agent(name, options, is_absolute_path);
2453       }
2454     // -javaagent
2455     } else if (match_option(option, "-javaagent:", &tail)) {
2456 #if !INCLUDE_JVMTI
2457       jio_fprintf(defaultStream::error_stream(),
2458         "Instrumentation agents are not supported in this VM\n");
2459       return JNI_ERR;
2460 #else
2461       if(tail != NULL) {
2462         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2463         add_init_agent("instrument", options, false);
2464       }
2465 #endif // !INCLUDE_JVMTI
2466     // -Xnoclassgc
2467     } else if (match_option(option, "-Xnoclassgc")) {
2468       if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2469         return JNI_EINVAL;
2470       }
2471     // -Xconcgc
2472     } else if (match_option(option, "-Xconcgc")) {
2473       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2474         return JNI_EINVAL;
2475       }
2476     // -Xnoconcgc
2477     } else if (match_option(option, "-Xnoconcgc")) {
2478       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2479         return JNI_EINVAL;
2480       }
2481     // -Xbatch
2482     } else if (match_option(option, "-Xbatch")) {
2483       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2484         return JNI_EINVAL;
2485       }
2486     // -Xmn for compatibility with other JVM vendors
2487     } else if (match_option(option, "-Xmn", &tail)) {
2488       julong long_initial_young_size = 0;
2489       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2490       if (errcode != arg_in_range) {
2491         jio_fprintf(defaultStream::error_stream(),
2492                     "Invalid initial young generation size: %s\n", option->optionString);
2493         describe_range_error(errcode);
2494         return JNI_EINVAL;
2495       }
2496       if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2497         return JNI_EINVAL;
2498       }
2499       if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2500         return JNI_EINVAL;
2501       }
2502     // -Xms
2503     } else if (match_option(option, "-Xms", &tail)) {
2504       julong long_initial_heap_size = 0;
2505       // an initial heap size of 0 means automatically determine
2506       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2507       if (errcode != arg_in_range) {
2508         jio_fprintf(defaultStream::error_stream(),
2509                     "Invalid initial heap size: %s\n", option->optionString);
2510         describe_range_error(errcode);
2511         return JNI_EINVAL;
2512       }
2513       set_min_heap_size((size_t)long_initial_heap_size);
2514       // Currently the minimum size and the initial heap sizes are the same.
2515       // Can be overridden with -XX:InitialHeapSize.
2516       if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2517         return JNI_EINVAL;
2518       }
2519     // -Xmx
2520     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2521       julong long_max_heap_size = 0;
2522       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2523       if (errcode != arg_in_range) {
2524         jio_fprintf(defaultStream::error_stream(),
2525                     "Invalid maximum heap size: %s\n", option->optionString);
2526         describe_range_error(errcode);
2527         return JNI_EINVAL;
2528       }
2529       if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2530         return JNI_EINVAL;
2531       }
2532     // Xmaxf
2533     } else if (match_option(option, "-Xmaxf", &tail)) {
2534       char* err;
2535       int maxf = (int)(strtod(tail, &err) * 100);
2536       if (*err != '\0' || *tail == '\0') {
2537         jio_fprintf(defaultStream::error_stream(),
2538                     "Bad max heap free percentage size: %s\n",
2539                     option->optionString);
2540         return JNI_EINVAL;
2541       } else {
2542         if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2543             return JNI_EINVAL;
2544         }
2545       }
2546     // Xminf
2547     } else if (match_option(option, "-Xminf", &tail)) {
2548       char* err;
2549       int minf = (int)(strtod(tail, &err) * 100);
2550       if (*err != '\0' || *tail == '\0') {
2551         jio_fprintf(defaultStream::error_stream(),
2552                     "Bad min heap free percentage size: %s\n",
2553                     option->optionString);
2554         return JNI_EINVAL;
2555       } else {
2556         if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2557           return JNI_EINVAL;
2558         }
2559       }
2560     // -Xss
2561     } else if (match_option(option, "-Xss", &tail)) {
2562       julong long_ThreadStackSize = 0;
2563       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2564       if (errcode != arg_in_range) {
2565         jio_fprintf(defaultStream::error_stream(),
2566                     "Invalid thread stack size: %s\n", option->optionString);
2567         describe_range_error(errcode);
2568         return JNI_EINVAL;
2569       }
2570       // Internally track ThreadStackSize in units of 1024 bytes.
2571       if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2572                        round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2573         return JNI_EINVAL;
2574       }
2575     // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2576     } else if (match_option(option, "-Xoss", &tail) ||
2577                match_option(option, "-Xsqnopause") ||
2578                match_option(option, "-Xoptimize") ||
2579                match_option(option, "-Xboundthreads")) {
2580       // All these options are deprecated in JDK 9 and will be removed in a future release
2581       char version[256];
2582       JDK_Version::jdk(9).to_string(version, sizeof(version));
2583       warning("ignoring option %s; support was removed in %s", option->optionString, version);
2584     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2585       julong long_CodeCacheExpansionSize = 0;
2586       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2587       if (errcode != arg_in_range) {
2588         jio_fprintf(defaultStream::error_stream(),
2589                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2590                    os::vm_page_size()/K);
2591         return JNI_EINVAL;
2592       }
2593       if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2594         return JNI_EINVAL;
2595       }
2596     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2597                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2598       julong long_ReservedCodeCacheSize = 0;
2599 
2600       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2601       if (errcode != arg_in_range) {
2602         jio_fprintf(defaultStream::error_stream(),
2603                     "Invalid maximum code cache size: %s.\n", option->optionString);
2604         return JNI_EINVAL;
2605       }
2606       if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2607         return JNI_EINVAL;
2608       }
2609       // -XX:NonNMethodCodeHeapSize=
2610     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2611       julong long_NonNMethodCodeHeapSize = 0;
2612 
2613       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2614       if (errcode != arg_in_range) {
2615         jio_fprintf(defaultStream::error_stream(),
2616                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2617         return JNI_EINVAL;
2618       }
2619       if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2620         return JNI_EINVAL;
2621       }
2622       // -XX:ProfiledCodeHeapSize=
2623     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2624       julong long_ProfiledCodeHeapSize = 0;
2625 
2626       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2627       if (errcode != arg_in_range) {
2628         jio_fprintf(defaultStream::error_stream(),
2629                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2630         return JNI_EINVAL;
2631       }
2632       if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2633         return JNI_EINVAL;
2634       }
2635       // -XX:NonProfiledCodeHeapSizee=
2636     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2637       julong long_NonProfiledCodeHeapSize = 0;
2638 
2639       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2640       if (errcode != arg_in_range) {
2641         jio_fprintf(defaultStream::error_stream(),
2642                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2643         return JNI_EINVAL;
2644       }
2645       if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2646         return JNI_EINVAL;
2647       }
2648     // -green
2649     } else if (match_option(option, "-green")) {
2650       jio_fprintf(defaultStream::error_stream(),
2651                   "Green threads support not available\n");
2652           return JNI_EINVAL;
2653     // -native
2654     } else if (match_option(option, "-native")) {
2655           // HotSpot always uses native threads, ignore silently for compatibility
2656     // -Xrs
2657     } else if (match_option(option, "-Xrs")) {
2658           // Classic/EVM option, new functionality
2659       if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2660         return JNI_EINVAL;
2661       }
2662     } else if (match_option(option, "-Xusealtsigs")) {
2663           // change default internal VM signals used - lower case for back compat
2664       if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
2665         return JNI_EINVAL;
2666       }
2667     // -Xprof
2668     } else if (match_option(option, "-Xprof")) {
2669 #if INCLUDE_FPROF
2670       _has_profile = true;
2671 #else // INCLUDE_FPROF
2672       jio_fprintf(defaultStream::error_stream(),
2673         "Flat profiling is not supported in this VM.\n");
2674       return JNI_ERR;
2675 #endif // INCLUDE_FPROF
2676     // -Xconcurrentio
2677     } else if (match_option(option, "-Xconcurrentio")) {
2678       if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2679         return JNI_EINVAL;
2680       }
2681       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2682         return JNI_EINVAL;
2683       }
2684       if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2685         return JNI_EINVAL;
2686       }
2687       if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2688         return JNI_EINVAL;
2689       }
2690       if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) {  // 20Kb per thread added to new generation
2691         return JNI_EINVAL;
2692       }
2693 
2694       // -Xinternalversion
2695     } else if (match_option(option, "-Xinternalversion")) {
2696       jio_fprintf(defaultStream::output_stream(), "%s\n",
2697                   VM_Version::internal_vm_info_string());
2698       vm_exit(0);
2699 #ifndef PRODUCT
2700     // -Xprintflags
2701     } else if (match_option(option, "-Xprintflags")) {
2702       CommandLineFlags::printFlags(tty, false);
2703       vm_exit(0);
2704 #endif
2705     // -D
2706     } else if (match_option(option, "-D", &tail)) {
2707       const char* value;
2708       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2709             *value!= '\0' && strcmp(value, "\"\"") != 0) {
2710         // abort if -Djava.endorsed.dirs is set
2711         jio_fprintf(defaultStream::output_stream(),
2712           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2713           "in modular form will be supported via the concept of upgradeable modules.\n", value);
2714         return JNI_EINVAL;
2715       }
2716       if (match_option(option, "-Djava.ext.dirs=", &value) &&
2717             *value != '\0' && strcmp(value, "\"\"") != 0) {
2718         // abort if -Djava.ext.dirs is set
2719         jio_fprintf(defaultStream::output_stream(),
2720           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
2721         return JNI_EINVAL;
2722       }
2723 
2724       if (!add_property(tail)) {
2725         return JNI_ENOMEM;
2726       }
2727       // Out of the box management support
2728       if (match_option(option, "-Dcom.sun.management", &tail)) {
2729 #if INCLUDE_MANAGEMENT
2730         if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2731           return JNI_EINVAL;
2732         }
2733 #else
2734         jio_fprintf(defaultStream::output_stream(),
2735           "-Dcom.sun.management is not supported in this VM.\n");
2736         return JNI_ERR;
2737 #endif
2738       }
2739     // -Xint
2740     } else if (match_option(option, "-Xint")) {
2741           set_mode_flags(_int);
2742     // -Xmixed
2743     } else if (match_option(option, "-Xmixed")) {
2744           set_mode_flags(_mixed);
2745     // -Xcomp
2746     } else if (match_option(option, "-Xcomp")) {
2747       // for testing the compiler; turn off all flags that inhibit compilation
2748           set_mode_flags(_comp);
2749     // -Xshare:dump
2750     } else if (match_option(option, "-Xshare:dump")) {
2751       if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2752         return JNI_EINVAL;
2753       }
2754       set_mode_flags(_int);     // Prevent compilation, which creates objects
2755     // -Xshare:on
2756     } else if (match_option(option, "-Xshare:on")) {
2757       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2758         return JNI_EINVAL;
2759       }
2760       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2761         return JNI_EINVAL;
2762       }
2763     // -Xshare:auto
2764     } else if (match_option(option, "-Xshare:auto")) {
2765       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2766         return JNI_EINVAL;
2767       }
2768       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2769         return JNI_EINVAL;
2770       }
2771     // -Xshare:off
2772     } else if (match_option(option, "-Xshare:off")) {
2773       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2774         return JNI_EINVAL;
2775       }
2776       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2777         return JNI_EINVAL;
2778       }
2779     // -Xverify
2780     } else if (match_option(option, "-Xverify", &tail)) {
2781       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2782         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2783           return JNI_EINVAL;
2784         }
2785         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2786           return JNI_EINVAL;
2787         }
2788       } else if (strcmp(tail, ":remote") == 0) {
2789         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2790           return JNI_EINVAL;
2791         }
2792         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2793           return JNI_EINVAL;
2794         }
2795       } else if (strcmp(tail, ":none") == 0) {
2796         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2797           return JNI_EINVAL;
2798         }
2799         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2800           return JNI_EINVAL;
2801         }
2802       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2803         return JNI_EINVAL;
2804       }
2805     // -Xdebug
2806     } else if (match_option(option, "-Xdebug")) {
2807       // note this flag has been used, then ignore
2808       set_xdebug_mode(true);
2809     // -Xnoagent
2810     } else if (match_option(option, "-Xnoagent")) {
2811       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2812     } else if (match_option(option, "-Xloggc:", &tail)) {
2813       // Redirect GC output to the file. -Xloggc:<filename>
2814       // ostream_init_log(), when called will use this filename
2815       // to initialize a fileStream.
2816       _gc_log_filename = os::strdup_check_oom(tail);
2817      if (!is_filename_valid(_gc_log_filename)) {
2818        jio_fprintf(defaultStream::output_stream(),
2819                   "Invalid file name for use with -Xloggc: Filename can only contain the "
2820                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2821                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
2822         return JNI_EINVAL;
2823       }
2824       if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2825         return JNI_EINVAL;
2826       }
2827       if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
2828         return JNI_EINVAL;
2829       }
2830     // JNI hooks
2831     } else if (match_option(option, "-Xcheck", &tail)) {
2832       if (!strcmp(tail, ":jni")) {
2833 #if !INCLUDE_JNI_CHECK
2834         warning("JNI CHECKING is not supported in this VM");
2835 #else
2836         CheckJNICalls = true;
2837 #endif // INCLUDE_JNI_CHECK
2838       } else if (is_bad_option(option, args->ignoreUnrecognized,
2839                                      "check")) {
2840         return JNI_EINVAL;
2841       }
2842     } else if (match_option(option, "vfprintf")) {
2843       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2844     } else if (match_option(option, "exit")) {
2845       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2846     } else if (match_option(option, "abort")) {
2847       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2848     // -XX:+AggressiveHeap
2849     } else if (match_option(option, "-XX:+AggressiveHeap")) {
2850 
2851       // This option inspects the machine and attempts to set various
2852       // parameters to be optimal for long-running, memory allocation
2853       // intensive jobs.  It is intended for machines with large
2854       // amounts of cpu and memory.
2855 
2856       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2857       // VM, but we may not be able to represent the total physical memory
2858       // available (like having 8gb of memory on a box but using a 32bit VM).
2859       // Thus, we need to make sure we're using a julong for intermediate
2860       // calculations.
2861       julong initHeapSize;
2862       julong total_memory = os::physical_memory();
2863 
2864       if (total_memory < (julong)256*M) {
2865         jio_fprintf(defaultStream::error_stream(),
2866                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2867         vm_exit(1);
2868       }
2869 
2870       // The heap size is half of available memory, or (at most)
2871       // all of possible memory less 160mb (leaving room for the OS
2872       // when using ISM).  This is the maximum; because adaptive sizing
2873       // is turned on below, the actual space used may be smaller.
2874 
2875       initHeapSize = MIN2(total_memory / (julong)2,
2876                           total_memory - (julong)160*M);
2877 
2878       initHeapSize = limit_by_allocatable_memory(initHeapSize);
2879 
2880       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2881          if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2882            return JNI_EINVAL;
2883          }
2884          if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2885            return JNI_EINVAL;
2886          }
2887          // Currently the minimum size and the initial heap sizes are the same.
2888          set_min_heap_size(initHeapSize);
2889       }
2890       if (FLAG_IS_DEFAULT(NewSize)) {
2891          // Make the young generation 3/8ths of the total heap.
2892          if (FLAG_SET_CMDLINE(size_t, NewSize,
2893                                 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) {
2894            return JNI_EINVAL;
2895          }
2896          if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2897            return JNI_EINVAL;
2898          }
2899       }
2900 
2901 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
2902       FLAG_SET_DEFAULT(UseLargePages, true);
2903 #endif
2904 
2905       // Increase some data structure sizes for efficiency
2906       if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2907         return JNI_EINVAL;
2908       }
2909       if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2910         return JNI_EINVAL;
2911       }
2912       if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) {
2913         return JNI_EINVAL;
2914       }
2915 
2916       // See the OldPLABSize comment below, but replace 'after promotion'
2917       // with 'after copying'.  YoungPLABSize is the size of the survivor
2918       // space per-gc-thread buffers.  The default is 4kw.
2919       if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) {      // Note: this is in words
2920         return JNI_EINVAL;
2921       }
2922 
2923       // OldPLABSize is the size of the buffers in the old gen that
2924       // UseParallelGC uses to promote live data that doesn't fit in the
2925       // survivor spaces.  At any given time, there's one for each gc thread.
2926       // The default size is 1kw. These buffers are rarely used, since the
2927       // survivor spaces are usually big enough.  For specjbb, however, there
2928       // are occasions when there's lots of live data in the young gen
2929       // and we end up promoting some of it.  We don't have a definite
2930       // explanation for why bumping OldPLABSize helps, but the theory
2931       // is that a bigger PLAB results in retaining something like the
2932       // original allocation order after promotion, which improves mutator
2933       // locality.  A minor effect may be that larger PLABs reduce the
2934       // number of PLAB allocation events during gc.  The value of 8kw
2935       // was arrived at by experimenting with specjbb.
2936       if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) {  // Note: this is in words
2937         return JNI_EINVAL;
2938       }
2939 
2940       // Enable parallel GC and adaptive generation sizing
2941       if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2942         return JNI_EINVAL;
2943       }
2944       FLAG_SET_DEFAULT(ParallelGCThreads,
2945                        Abstract_VM_Version::parallel_worker_threads());
2946 
2947       // Encourage steady state memory management
2948       if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2949         return JNI_EINVAL;
2950       }
2951 
2952       // This appears to improve mutator locality
2953       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2954         return JNI_EINVAL;
2955       }
2956 
2957       // Get around early Solaris scheduling bug
2958       // (affinity vs other jobs on system)
2959       // but disallow DR and offlining (5008695).
2960       if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2961         return JNI_EINVAL;
2962       }
2963 
2964     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2965     // and the last option wins.
2966     } else if (match_option(option, "-XX:+NeverTenure")) {
2967       if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
2968         return JNI_EINVAL;
2969       }
2970       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2971         return JNI_EINVAL;
2972       }
2973       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
2974         return JNI_EINVAL;
2975       }
2976     } else if (match_option(option, "-XX:+AlwaysTenure")) {
2977       if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2978         return JNI_EINVAL;
2979       }
2980       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2981         return JNI_EINVAL;
2982       }
2983       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
2984         return JNI_EINVAL;
2985       }
2986     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2987       uintx max_tenuring_thresh = 0;
2988       if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2989         jio_fprintf(defaultStream::error_stream(),
2990                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2991         return JNI_EINVAL;
2992       }
2993 
2994       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
2995         return JNI_EINVAL;
2996       }
2997 
2998       if (MaxTenuringThreshold == 0) {
2999         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3000           return JNI_EINVAL;
3001         }
3002         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3003           return JNI_EINVAL;
3004         }
3005       } else {
3006         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3007           return JNI_EINVAL;
3008         }
3009         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3010           return JNI_EINVAL;
3011         }
3012       }
3013     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3014       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3015         return JNI_EINVAL;
3016       }
3017       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3018         return JNI_EINVAL;
3019       }
3020     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3021       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3022         return JNI_EINVAL;
3023       }
3024       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3025         return JNI_EINVAL;
3026       }
3027     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3028 #if defined(DTRACE_ENABLED)
3029       if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3030         return JNI_EINVAL;
3031       }
3032       if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3033         return JNI_EINVAL;
3034       }
3035       if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3036         return JNI_EINVAL;
3037       }
3038       if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3039         return JNI_EINVAL;
3040       }
3041 #else // defined(DTRACE_ENABLED)
3042       jio_fprintf(defaultStream::error_stream(),
3043                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3044       return JNI_EINVAL;
3045 #endif // defined(DTRACE_ENABLED)
3046 #ifdef ASSERT
3047     } else if (match_option(option, "-XX:+FullGCALot")) {
3048       if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3049         return JNI_EINVAL;
3050       }
3051       // disable scavenge before parallel mark-compact
3052       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3053         return JNI_EINVAL;
3054       }
3055 #endif
3056     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3057                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3058       julong stack_size = 0;
3059       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3060       if (errcode != arg_in_range) {
3061         jio_fprintf(defaultStream::error_stream(),
3062                     "Invalid mark stack size: %s\n", option->optionString);
3063         describe_range_error(errcode);
3064         return JNI_EINVAL;
3065       }
3066       jio_fprintf(defaultStream::error_stream(),
3067         "Please use -XX:MarkStackSize in place of "
3068         "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3069       if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) {
3070         return JNI_EINVAL;
3071       }
3072     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3073       julong max_stack_size = 0;
3074       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3075       if (errcode != arg_in_range) {
3076         jio_fprintf(defaultStream::error_stream(),
3077                     "Invalid maximum mark stack size: %s\n",
3078                     option->optionString);
3079         describe_range_error(errcode);
3080         return JNI_EINVAL;
3081       }
3082       jio_fprintf(defaultStream::error_stream(),
3083          "Please use -XX:MarkStackSizeMax in place of "
3084          "-XX:CMSMarkStackSizeMax in the future\n");
3085       if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) {
3086         return JNI_EINVAL;
3087       }
3088     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3089                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3090       uintx conc_threads = 0;
3091       if (!parse_uintx(tail, &conc_threads, 1)) {
3092         jio_fprintf(defaultStream::error_stream(),
3093                     "Invalid concurrent threads: %s\n", option->optionString);
3094         return JNI_EINVAL;
3095       }
3096       jio_fprintf(defaultStream::error_stream(),
3097         "Please use -XX:ConcGCThreads in place of "
3098         "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3099       if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) {
3100         return JNI_EINVAL;
3101       }
3102     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3103       julong max_direct_memory_size = 0;
3104       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3105       if (errcode != arg_in_range) {
3106         jio_fprintf(defaultStream::error_stream(),
3107                     "Invalid maximum direct memory size: %s\n",
3108                     option->optionString);
3109         describe_range_error(errcode);
3110         return JNI_EINVAL;
3111       }
3112       if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3113         return JNI_EINVAL;
3114       }
3115 #if !INCLUDE_MANAGEMENT
3116     } else if (match_option(option, "-XX:+ManagementServer")) {
3117         jio_fprintf(defaultStream::error_stream(),
3118           "ManagementServer is not supported in this VM.\n");
3119         return JNI_ERR;
3120 #endif // INCLUDE_MANAGEMENT
3121     // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3122     } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3123       if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) {
3124         return JNI_EINVAL;
3125       }
3126       jio_fprintf(defaultStream::output_stream(),
3127           "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3128     } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3129       if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) {
3130         return JNI_EINVAL;
3131       }
3132       jio_fprintf(defaultStream::output_stream(),
3133           "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3134     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3135       // Skip -XX:Flags= since that case has already been handled
3136       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3137         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3138           return JNI_EINVAL;
3139         }
3140       }
3141     // Unknown option
3142     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3143       return JNI_ERR;
3144     }
3145   }
3146 
3147   // PrintSharedArchiveAndExit will turn on
3148   //   -Xshare:on
3149   //   -XX:+TraceClassPaths
3150   if (PrintSharedArchiveAndExit) {
3151     if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3152       return JNI_EINVAL;
3153     }
3154     if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3155       return JNI_EINVAL;
3156     }
3157     if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3158       return JNI_EINVAL;
3159     }
3160   }
3161 
3162   // Change the default value for flags  which have different default values
3163   // when working with older JDKs.
3164 #ifdef LINUX
3165  if (JDK_Version::current().compare_major(6) <= 0 &&
3166       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3167     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3168   }
3169 #endif // LINUX
3170   fix_appclasspath();
3171   return JNI_OK;
3172 }
3173 
3174 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3175 //
3176 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3177 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3178 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3179 // path is treated as the current directory.
3180 //
3181 // This causes problems with CDS, which requires that all directories specified in the classpath
3182 // must be empty. In most cases, applications do NOT want to load classes from the current
3183 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3184 // scripts compatible with CDS.
3185 void Arguments::fix_appclasspath() {
3186   if (IgnoreEmptyClassPaths) {
3187     const char separator = *os::path_separator();
3188     const char* src = _java_class_path->value();
3189 
3190     // skip over all the leading empty paths
3191     while (*src == separator) {
3192       src ++;
3193     }
3194 
3195     char* copy = os::strdup_check_oom(src, mtInternal);
3196 
3197     // trim all trailing empty paths
3198     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3199       *tail = '\0';
3200     }
3201 
3202     char from[3] = {separator, separator, '\0'};
3203     char to  [2] = {separator, '\0'};
3204     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3205       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3206       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3207     }
3208 
3209     _java_class_path->set_value(copy);
3210     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3211   }
3212 
3213   if (!PrintSharedArchiveAndExit) {
3214     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3215   }
3216 }
3217 
3218 static bool has_jar_files(const char* directory) {
3219   DIR* dir = os::opendir(directory);
3220   if (dir == NULL) return false;
3221 
3222   struct dirent *entry;
3223   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3224   bool hasJarFile = false;
3225   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3226     const char* name = entry->d_name;
3227     const char* ext = name + strlen(name) - 4;
3228     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3229   }
3230   FREE_C_HEAP_ARRAY(char, dbuf);
3231   os::closedir(dir);
3232   return hasJarFile ;
3233 }
3234 
3235 static int check_non_empty_dirs(const char* path) {
3236   const char separator = *os::path_separator();
3237   const char* const end = path + strlen(path);
3238   int nonEmptyDirs = 0;
3239   while (path < end) {
3240     const char* tmp_end = strchr(path, separator);
3241     if (tmp_end == NULL) {
3242       if (has_jar_files(path)) {
3243         nonEmptyDirs++;
3244         jio_fprintf(defaultStream::output_stream(),
3245           "Non-empty directory: %s\n", path);
3246       }
3247       path = end;
3248     } else {
3249       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3250       memcpy(dirpath, path, tmp_end - path);
3251       dirpath[tmp_end - path] = '\0';
3252       if (has_jar_files(dirpath)) {
3253         nonEmptyDirs++;
3254         jio_fprintf(defaultStream::output_stream(),
3255           "Non-empty directory: %s\n", dirpath);
3256       }
3257       FREE_C_HEAP_ARRAY(char, dirpath);
3258       path = tmp_end + 1;
3259     }
3260   }
3261   return nonEmptyDirs;
3262 }
3263 
3264 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3265   // check if the default lib/endorsed directory exists; if so, error
3266   char path[JVM_MAXPATHLEN];
3267   const char* fileSep = os::file_separator();
3268   sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3269 
3270   if (CheckEndorsedAndExtDirs) {
3271     int nonEmptyDirs = 0;
3272     // check endorsed directory
3273     nonEmptyDirs += check_non_empty_dirs(path);
3274     // check the extension directories
3275     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3276     if (nonEmptyDirs > 0) {
3277       return JNI_ERR;
3278     }
3279   }
3280 
3281   DIR* dir = os::opendir(path);
3282   if (dir != NULL) {
3283     jio_fprintf(defaultStream::output_stream(),
3284       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3285       "in modular form will be supported via the concept of upgradeable modules.\n");
3286     os::closedir(dir);
3287     return JNI_ERR;
3288   }
3289 
3290   sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3291   dir = os::opendir(path);
3292   if (dir != NULL) {
3293     jio_fprintf(defaultStream::output_stream(),
3294       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3295       "Use -classpath instead.\n.");
3296     os::closedir(dir);
3297     return JNI_ERR;
3298   }
3299 
3300   if (scp_assembly_required) {
3301     // Assemble the bootclasspath elements into the final path.
3302     Arguments::set_sysclasspath(scp_p->combined_path());
3303   }
3304 
3305   // This must be done after all arguments have been processed.
3306   // java_compiler() true means set to "NONE" or empty.
3307   if (java_compiler() && !xdebug_mode()) {
3308     // For backwards compatibility, we switch to interpreted mode if
3309     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3310     // not specified.
3311     set_mode_flags(_int);
3312   }
3313 
3314   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3315   // but like -Xint, leave compilation thresholds unaffected.
3316   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3317   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3318     set_mode_flags(_int);
3319   }
3320 
3321   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3322   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3323     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3324   }
3325 
3326 #ifndef COMPILER2
3327   // Don't degrade server performance for footprint
3328   if (FLAG_IS_DEFAULT(UseLargePages) &&
3329       MaxHeapSize < LargePageHeapSizeThreshold) {
3330     // No need for large granularity pages w/small heaps.
3331     // Note that large pages are enabled/disabled for both the
3332     // Java heap and the code cache.
3333     FLAG_SET_DEFAULT(UseLargePages, false);
3334   }
3335 
3336 #else
3337   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3338     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3339   }
3340 #endif
3341 
3342 #ifndef TIERED
3343   // Tiered compilation is undefined.
3344   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3345 #endif
3346 
3347   // If we are running in a headless jre, force java.awt.headless property
3348   // to be true unless the property has already been set.
3349   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3350   if (os::is_headless_jre()) {
3351     const char* headless = Arguments::get_property("java.awt.headless");
3352     if (headless == NULL) {
3353       const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3354       if (headless_env == NULL) {
3355         if (!add_property("java.awt.headless=true")) {
3356           return JNI_ENOMEM;
3357         }
3358       } else {
3359         char buffer[256];
3360         jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3361         if (!add_property(buffer)) {
3362           return JNI_ENOMEM;
3363         }
3364       }
3365     }
3366   }
3367 
3368   if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3369     // CMS can only be used with ParNew
3370     FLAG_SET_ERGO(bool, UseParNewGC, true);
3371   }
3372 
3373   if (!check_vm_args_consistency()) {
3374     return JNI_ERR;
3375   }
3376 
3377   return JNI_OK;
3378 }
3379 
3380 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3381   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3382                                             scp_assembly_required_p);
3383 }
3384 
3385 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3386   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3387                                             scp_assembly_required_p);
3388 }
3389 
3390 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3391   char *buffer = ::getenv(name);
3392 
3393   // Don't check this variable if user has special privileges
3394   // (e.g. unix su command).
3395   if (buffer == NULL || os::have_special_privileges()) {
3396     return JNI_OK;
3397   }
3398 
3399   if ((buffer = os::strdup(buffer)) == NULL) {
3400     return JNI_ENOMEM;
3401   }
3402 
3403   GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true);    // Construct option array
3404   jio_fprintf(defaultStream::error_stream(),
3405               "Picked up %s: %s\n", name, buffer);
3406   char* rd = buffer;                        // pointer to the input string (rd)
3407   while (true) {                            // repeat for all options in the input string
3408     while (isspace(*rd)) rd++;              // skip whitespace
3409     if (*rd == 0) break;                    // we re done when the input string is read completely
3410 
3411     // The output, option string, overwrites the input string.
3412     // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3413     // input string (rd).
3414     char* wrt = rd;
3415 
3416     JavaVMOption option;
3417     option.optionString = wrt;
3418     options->append(option);                // Fill in option
3419     while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3420       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3421         int quote = *rd;                    // matching quote to look for
3422         rd++;                               // don't copy open quote
3423         while (*rd != quote) {              // include everything (even spaces) up until quote
3424           if (*rd == 0) {                   // string termination means unmatched string
3425             jio_fprintf(defaultStream::error_stream(),
3426                         "Unmatched quote in %s\n", name);
3427             delete options;
3428             os::free(buffer);
3429             return JNI_ERR;
3430           }
3431           *wrt++ = *rd++;                   // copy to option string
3432         }
3433         rd++;                               // don't copy close quote
3434       } else {
3435         *wrt++ = *rd++;                     // copy to option string
3436       }
3437     }
3438     // Need to check if we're done before writing a NULL,
3439     // because the write could be to the byte that rd is pointing to.
3440     if (*rd++ == 0) {
3441       *wrt = 0;
3442       break;
3443     }
3444     *wrt = 0;                               // Zero terminate option
3445   }
3446   JavaVMOption* options_arr =
3447       NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3448   if (options_arr == NULL) {
3449     delete options;
3450     os::free(buffer);
3451     return JNI_ENOMEM;
3452   }
3453   for (int i = 0; i < options->length(); i++) {
3454     options_arr[i] = options->at(i);
3455   }
3456 
3457   // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3458   JavaVMInitArgs vm_args;
3459   vm_args.version = JNI_VERSION_1_2;
3460   vm_args.options = options_arr;
3461   vm_args.nOptions = options->length();
3462   vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3463 
3464   if (PrintVMOptions) {
3465     const char* tail;
3466     for (int i = 0; i < vm_args.nOptions; i++) {
3467       const JavaVMOption *option = vm_args.options + i;
3468       if (match_option(option, "-XX:", &tail)) {
3469         logOption(tail);
3470       }
3471     }
3472   }
3473 
3474   jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3475                                        Flag::ENVIRON_VAR);
3476   FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3477   delete options;
3478   os::free(buffer);
3479   return result;
3480 }
3481 
3482 void Arguments::set_shared_spaces_flags() {
3483   if (DumpSharedSpaces) {
3484     if (RequireSharedSpaces) {
3485       warning("cannot dump shared archive while using shared archive");
3486     }
3487     UseSharedSpaces = false;
3488 #ifdef _LP64
3489     if (!UseCompressedOops || !UseCompressedClassPointers) {
3490       vm_exit_during_initialization(
3491         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3492     }
3493   } else {
3494     if (!UseCompressedOops || !UseCompressedClassPointers) {
3495       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3496     }
3497 #endif
3498   }
3499 }
3500 
3501 #if !INCLUDE_ALL_GCS
3502 static void force_serial_gc() {
3503   FLAG_SET_DEFAULT(UseSerialGC, true);
3504   UNSUPPORTED_GC_OPTION(UseG1GC);
3505   UNSUPPORTED_GC_OPTION(UseParallelGC);
3506   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3507   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3508   UNSUPPORTED_GC_OPTION(UseParNewGC);
3509 }
3510 #endif // INCLUDE_ALL_GCS
3511 
3512 // Sharing support
3513 // Construct the path to the archive
3514 static char* get_shared_archive_path() {
3515   char *shared_archive_path;
3516   if (SharedArchiveFile == NULL) {
3517     char jvm_path[JVM_MAXPATHLEN];
3518     os::jvm_path(jvm_path, sizeof(jvm_path));
3519     char *end = strrchr(jvm_path, *os::file_separator());
3520     if (end != NULL) *end = '\0';
3521     size_t jvm_path_len = strlen(jvm_path);
3522     size_t file_sep_len = strlen(os::file_separator());
3523     const size_t len = jvm_path_len + file_sep_len + 20;
3524     shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3525     if (shared_archive_path != NULL) {
3526       jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3527         jvm_path, os::file_separator());
3528     }
3529   } else {
3530     shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3531   }
3532   return shared_archive_path;
3533 }
3534 
3535 #ifndef PRODUCT
3536 // Determine whether LogVMOutput should be implicitly turned on.
3537 static bool use_vm_log() {
3538   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3539       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3540       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3541       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3542       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3543     return true;
3544   }
3545 
3546 #ifdef COMPILER1
3547   if (PrintC1Statistics) {
3548     return true;
3549   }
3550 #endif // COMPILER1
3551 
3552 #ifdef COMPILER2
3553   if (PrintOptoAssembly || PrintOptoStatistics) {
3554     return true;
3555   }
3556 #endif // COMPILER2
3557 
3558   return false;
3559 }
3560 #endif // PRODUCT
3561 
3562 // Parse entry point called from JNI_CreateJavaVM
3563 
3564 jint Arguments::parse(const JavaVMInitArgs* args) {
3565 
3566   // Initialize ranges and constraints
3567   CommandLineFlagRangeList::init();
3568   CommandLineFlagConstraintList::init();
3569 
3570   // Remaining part of option string
3571   const char* tail;
3572 
3573   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3574   const char* hotspotrc = ".hotspotrc";
3575   bool settings_file_specified = false;
3576   bool needs_hotspotrc_warning = false;
3577 
3578   const char* flags_file;
3579   int index;
3580   for (index = 0; index < args->nOptions; index++) {
3581     const JavaVMOption *option = args->options + index;
3582     if (ArgumentsExt::process_options(option)) {
3583       continue;
3584     }
3585     if (match_option(option, "-XX:Flags=", &tail)) {
3586       flags_file = tail;
3587       settings_file_specified = true;
3588       continue;
3589     }
3590     if (match_option(option, "-XX:+PrintVMOptions")) {
3591       PrintVMOptions = true;
3592       continue;
3593     }
3594     if (match_option(option, "-XX:-PrintVMOptions")) {
3595       PrintVMOptions = false;
3596       continue;
3597     }
3598     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3599       IgnoreUnrecognizedVMOptions = true;
3600       continue;
3601     }
3602     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3603       IgnoreUnrecognizedVMOptions = false;
3604       continue;
3605     }
3606     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3607       CommandLineFlags::printFlags(tty, false);
3608       vm_exit(0);
3609     }
3610     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3611 #if INCLUDE_NMT
3612       // The launcher did not setup nmt environment variable properly.
3613       if (!MemTracker::check_launcher_nmt_support(tail)) {
3614         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3615       }
3616 
3617       // Verify if nmt option is valid.
3618       if (MemTracker::verify_nmt_option()) {
3619         // Late initialization, still in single-threaded mode.
3620         if (MemTracker::tracking_level() >= NMT_summary) {
3621           MemTracker::init();
3622         }
3623       } else {
3624         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3625       }
3626       continue;
3627 #else
3628       jio_fprintf(defaultStream::error_stream(),
3629         "Native Memory Tracking is not supported in this VM\n");
3630       return JNI_ERR;
3631 #endif
3632     }
3633 
3634 #ifndef PRODUCT
3635     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3636       CommandLineFlags::printFlags(tty, true);
3637       vm_exit(0);
3638     }
3639 #endif
3640   }
3641 
3642   if (IgnoreUnrecognizedVMOptions) {
3643     // uncast const to modify the flag args->ignoreUnrecognized
3644     *(jboolean*)(&args->ignoreUnrecognized) = true;
3645   }
3646 
3647   // Parse specified settings file
3648   if (settings_file_specified) {
3649     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3650       return JNI_EINVAL;
3651     }
3652   } else {
3653 #ifdef ASSERT
3654     // Parse default .hotspotrc settings file
3655     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3656       return JNI_EINVAL;
3657     }
3658 #else
3659     struct stat buf;
3660     if (os::stat(hotspotrc, &buf) == 0) {
3661       needs_hotspotrc_warning = true;
3662     }
3663 #endif
3664   }
3665 
3666   if (PrintVMOptions) {
3667     for (index = 0; index < args->nOptions; index++) {
3668       const JavaVMOption *option = args->options + index;
3669       if (match_option(option, "-XX:", &tail)) {
3670         logOption(tail);
3671       }
3672     }
3673   }
3674 
3675   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3676   jint result = parse_vm_init_args(args);
3677   if (result != JNI_OK) {
3678     return result;
3679   }
3680 
3681   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3682   SharedArchivePath = get_shared_archive_path();
3683   if (SharedArchivePath == NULL) {
3684     return JNI_ENOMEM;
3685   }
3686 
3687   // Set up VerifySharedSpaces
3688   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3689     VerifySharedSpaces = true;
3690   }
3691 
3692   // Delay warning until here so that we've had a chance to process
3693   // the -XX:-PrintWarnings flag
3694   if (needs_hotspotrc_warning) {
3695     warning("%s file is present but has been ignored.  "
3696             "Run with -XX:Flags=%s to load the file.",
3697             hotspotrc, hotspotrc);
3698   }
3699 
3700 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
3701   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3702 #endif
3703 
3704   ArgumentsExt::report_unsupported_options();
3705 
3706 #ifndef PRODUCT
3707   if (TraceBytecodesAt != 0) {
3708     TraceBytecodes = true;
3709   }
3710   if (CountCompiledCalls) {
3711     if (UseCounterDecay) {
3712       warning("UseCounterDecay disabled because CountCalls is set");
3713       UseCounterDecay = false;
3714     }
3715   }
3716 #endif // PRODUCT
3717 
3718   if (ScavengeRootsInCode == 0) {
3719     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3720       warning("forcing ScavengeRootsInCode non-zero");
3721     }
3722     ScavengeRootsInCode = 1;
3723   }
3724 
3725   if (PrintGCDetails) {
3726     // Turn on -verbose:gc options as well
3727     PrintGC = true;
3728   }
3729 
3730   // Set object alignment values.
3731   set_object_alignment();
3732 
3733 #if !INCLUDE_ALL_GCS
3734   force_serial_gc();
3735 #endif // INCLUDE_ALL_GCS
3736 #if !INCLUDE_CDS
3737   if (DumpSharedSpaces || RequireSharedSpaces) {
3738     jio_fprintf(defaultStream::error_stream(),
3739       "Shared spaces are not supported in this VM\n");
3740     return JNI_ERR;
3741   }
3742   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3743     warning("Shared spaces are not supported in this VM");
3744     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3745     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3746   }
3747   no_shared_spaces("CDS Disabled");
3748 #endif // INCLUDE_CDS
3749 
3750   // The Semaphore class isn't implemented on all platforms.
3751 #if !IMPLEMENTS_SEMAPHORE_CLASS
3752   if (UseSemaphoreGCThreadsSynchronization && FLAG_IS_CMDLINE(UseSemaphoreGCThreadsSynchronization)) {
3753     warning("Semaphore GC Thread Synchronization is not implemented for this platform");
3754     FLAG_SET_DEFAULT(UseSemaphoreGCThreadsSynchronization, false);
3755   }
3756 #endif
3757 
3758   return JNI_OK;
3759 }
3760 
3761 jint Arguments::apply_ergo() {
3762 
3763   // Set flags based on ergonomics.
3764   set_ergonomics_flags();
3765 
3766   set_shared_spaces_flags();
3767 
3768   // Check the GC selections again.
3769   if (!check_gc_consistency()) {
3770     return JNI_EINVAL;
3771   }
3772 
3773   if (TieredCompilation) {
3774     set_tiered_flags();
3775   } else {
3776     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3777     if (CompilationPolicyChoice >= 2) {
3778       vm_exit_during_initialization(
3779         "Incompatible compilation policy selected", NULL);
3780     }
3781     // Scale CompileThreshold
3782     // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3783     if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3784       FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3785     }
3786   }
3787 
3788 #ifdef COMPILER2
3789 #ifndef PRODUCT
3790   if (PrintIdealGraphLevel > 0) {
3791     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3792   }
3793 #endif
3794 #endif
3795 
3796   // Set heap size based on available physical memory
3797   set_heap_size();
3798 
3799   ArgumentsExt::set_gc_specific_flags();
3800 
3801   // Initialize Metaspace flags and alignments
3802   Metaspace::ergo_initialize();
3803 
3804   // Set bytecode rewriting flags
3805   set_bytecode_flags();
3806 
3807   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3808   set_aggressive_opts_flags();
3809 
3810   // Turn off biased locking for locking debug mode flags,
3811   // which are subtly different from each other but neither works with
3812   // biased locking
3813   if (UseHeavyMonitors
3814 #ifdef COMPILER1
3815       || !UseFastLocking
3816 #endif // COMPILER1
3817     ) {
3818     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3819       // flag set to true on command line; warn the user that they
3820       // can't enable biased locking here
3821       warning("Biased Locking is not supported with locking debug flags"
3822               "; ignoring UseBiasedLocking flag." );
3823     }
3824     UseBiasedLocking = false;
3825   }
3826 
3827 #ifdef ZERO
3828   // Clear flags not supported on zero.
3829   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3830   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3831   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3832   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3833 #endif // CC_INTERP
3834 
3835 #ifdef COMPILER2
3836   if (!EliminateLocks) {
3837     EliminateNestedLocks = false;
3838   }
3839   if (!Inline) {
3840     IncrementalInline = false;
3841   }
3842 #ifndef PRODUCT
3843   if (!IncrementalInline) {
3844     AlwaysIncrementalInline = false;
3845   }
3846 #endif
3847   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3848     // nothing to use the profiling, turn if off
3849     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3850   }
3851 #endif
3852 
3853   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3854     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3855     DebugNonSafepoints = true;
3856   }
3857 
3858   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3859     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3860   }
3861 
3862 #ifndef PRODUCT
3863   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3864     if (use_vm_log()) {
3865       LogVMOutput = true;
3866     }
3867   }
3868 #endif // PRODUCT
3869 
3870   if (PrintCommandLineFlags) {
3871     CommandLineFlags::printSetFlags(tty);
3872   }
3873 
3874   // Apply CPU specific policy for the BiasedLocking
3875   if (UseBiasedLocking) {
3876     if (!VM_Version::use_biased_locking() &&
3877         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3878       UseBiasedLocking = false;
3879     }
3880   }
3881 #ifdef COMPILER2
3882   if (!UseBiasedLocking || EmitSync != 0) {
3883     UseOptoBiasInlining = false;
3884   }
3885 #endif
3886 
3887   return JNI_OK;
3888 }
3889 
3890 jint Arguments::adjust_after_os() {
3891   if (UseNUMA) {
3892     if (UseParallelGC || UseParallelOldGC) {
3893       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3894          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3895       }
3896     }
3897     // UseNUMAInterleaving is set to ON for all collectors and
3898     // platforms when UseNUMA is set to ON. NUMA-aware collectors
3899     // such as the parallel collector for Linux and Solaris will
3900     // interleave old gen and survivor spaces on top of NUMA
3901     // allocation policy for the eden space.
3902     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3903     // all platforms and ParallelGC on Windows will interleave all
3904     // of the heap spaces across NUMA nodes.
3905     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3906       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3907     }
3908   }
3909   return JNI_OK;
3910 }
3911 
3912 // Any custom code post the final range and constraint check
3913 // can be done here. We pass a flag that specifies whether
3914 // the check passed successfully
3915 void Arguments::post_final_range_and_constraint_check(bool check_passed) {
3916   // This does not set the flag itself, but stores the value in a safe place for later usage.
3917   _min_heap_free_ratio = MinHeapFreeRatio;
3918   _max_heap_free_ratio = MaxHeapFreeRatio;
3919 }
3920 
3921 int Arguments::PropertyList_count(SystemProperty* pl) {
3922   int count = 0;
3923   while(pl != NULL) {
3924     count++;
3925     pl = pl->next();
3926   }
3927   return count;
3928 }
3929 
3930 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3931   assert(key != NULL, "just checking");
3932   SystemProperty* prop;
3933   for (prop = pl; prop != NULL; prop = prop->next()) {
3934     if (strcmp(key, prop->key()) == 0) return prop->value();
3935   }
3936   return NULL;
3937 }
3938 
3939 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3940   int count = 0;
3941   const char* ret_val = NULL;
3942 
3943   while(pl != NULL) {
3944     if(count >= index) {
3945       ret_val = pl->key();
3946       break;
3947     }
3948     count++;
3949     pl = pl->next();
3950   }
3951 
3952   return ret_val;
3953 }
3954 
3955 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3956   int count = 0;
3957   char* ret_val = NULL;
3958 
3959   while(pl != NULL) {
3960     if(count >= index) {
3961       ret_val = pl->value();
3962       break;
3963     }
3964     count++;
3965     pl = pl->next();
3966   }
3967 
3968   return ret_val;
3969 }
3970 
3971 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3972   SystemProperty* p = *plist;
3973   if (p == NULL) {
3974     *plist = new_p;
3975   } else {
3976     while (p->next() != NULL) {
3977       p = p->next();
3978     }
3979     p->set_next(new_p);
3980   }
3981 }
3982 
3983 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3984   if (plist == NULL)
3985     return;
3986 
3987   SystemProperty* new_p = new SystemProperty(k, v, true);
3988   PropertyList_add(plist, new_p);
3989 }
3990 
3991 void Arguments::PropertyList_add(SystemProperty *element) {
3992   PropertyList_add(&_system_properties, element);
3993 }
3994 
3995 // This add maintains unique property key in the list.
3996 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3997   if (plist == NULL)
3998     return;
3999 
4000   // If property key exist then update with new value.
4001   SystemProperty* prop;
4002   for (prop = *plist; prop != NULL; prop = prop->next()) {
4003     if (strcmp(k, prop->key()) == 0) {
4004       if (append) {
4005         prop->append_value(v);
4006       } else {
4007         prop->set_value(v);
4008       }
4009       return;
4010     }
4011   }
4012 
4013   PropertyList_add(plist, k, v);
4014 }
4015 
4016 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4017 // Returns true if all of the source pointed by src has been copied over to
4018 // the destination buffer pointed by buf. Otherwise, returns false.
4019 // Notes:
4020 // 1. If the length (buflen) of the destination buffer excluding the
4021 // NULL terminator character is not long enough for holding the expanded
4022 // pid characters, it also returns false instead of returning the partially
4023 // expanded one.
4024 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4025 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4026                                 char* buf, size_t buflen) {
4027   const char* p = src;
4028   char* b = buf;
4029   const char* src_end = &src[srclen];
4030   char* buf_end = &buf[buflen - 1];
4031 
4032   while (p < src_end && b < buf_end) {
4033     if (*p == '%') {
4034       switch (*(++p)) {
4035       case '%':         // "%%" ==> "%"
4036         *b++ = *p++;
4037         break;
4038       case 'p':  {       //  "%p" ==> current process id
4039         // buf_end points to the character before the last character so
4040         // that we could write '\0' to the end of the buffer.
4041         size_t buf_sz = buf_end - b + 1;
4042         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4043 
4044         // if jio_snprintf fails or the buffer is not long enough to hold
4045         // the expanded pid, returns false.
4046         if (ret < 0 || ret >= (int)buf_sz) {
4047           return false;
4048         } else {
4049           b += ret;
4050           assert(*b == '\0', "fail in copy_expand_pid");
4051           if (p == src_end && b == buf_end + 1) {
4052             // reach the end of the buffer.
4053             return true;
4054           }
4055         }
4056         p++;
4057         break;
4058       }
4059       default :
4060         *b++ = '%';
4061       }
4062     } else {
4063       *b++ = *p++;
4064     }
4065   }
4066   *b = '\0';
4067   return (p == src_end); // return false if not all of the source was copied
4068 }