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 "code/codeCacheExtensions.hpp"
  31 #include "compiler/compilerOracle.hpp"
  32 #include "gc/shared/cardTableRS.hpp"
  33 #include "gc/shared/genCollectedHeap.hpp"
  34 #include "gc/shared/referenceProcessor.hpp"
  35 #include "gc/shared/taskqueue.hpp"
  36 #include "memory/allocation.inline.hpp"
  37 #include "memory/universe.inline.hpp"
  38 #include "oops/oop.inline.hpp"
  39 #include "prims/jvmtiExport.hpp"
  40 #include "runtime/arguments.hpp"
  41 #include "runtime/arguments_ext.hpp"
  42 #include "runtime/commandLineFlagConstraintList.hpp"
  43 #include "runtime/commandLineFlagRangeList.hpp"
  44 #include "runtime/globals.hpp"
  45 #include "runtime/globals_extension.hpp"
  46 #include "runtime/java.hpp"
  47 #include "runtime/os.hpp"
  48 #include "runtime/vm_version.hpp"
  49 #include "services/management.hpp"
  50 #include "services/memTracker.hpp"
  51 #include "utilities/defaultStream.hpp"
  52 #include "utilities/macros.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()
  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   { "LazyBootClassLoader",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 280   { "StarvationMonitorInterval",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 281   { "PreInflateSpin",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 282   { NULL, JDK_Version(0), JDK_Version(0) }
 283 };
 284 
 285 // Returns true if the flag is obsolete and fits into the range specified
 286 // for being ignored.  In the case that the flag is ignored, the 'version'
 287 // value is filled in with the version number when the flag became
 288 // obsolete so that that value can be displayed to the user.
 289 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 290   int i = 0;
 291   assert(version != NULL, "Must provide a version buffer");
 292   while (obsolete_jvm_flags[i].name != NULL) {
 293     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 294     // <flag>=xxx form
 295     // [-|+]<flag> form
 296     size_t len = strlen(flag_status.name);
 297     if ((strncmp(flag_status.name, s, len) == 0) &&
 298         (strlen(s) == len)){
 299       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 300           *version = flag_status.obsoleted_in;
 301           return true;
 302       }
 303     }
 304     i++;
 305   }
 306   return false;
 307 }
 308 
 309 // Constructs the system class path (aka boot class path) from the following
 310 // components, in order:
 311 //
 312 //     prefix           // from -Xbootclasspath/p:...
 313 //     base             // from os::get_system_properties() or -Xbootclasspath=
 314 //     suffix           // from -Xbootclasspath/a:...
 315 //
 316 // This could be AllStatic, but it isn't needed after argument processing is
 317 // complete.
 318 class SysClassPath: public StackObj {
 319 public:
 320   SysClassPath(const char* base);
 321   ~SysClassPath();
 322 
 323   inline void set_base(const char* base);
 324   inline void add_prefix(const char* prefix);
 325   inline void add_suffix_to_prefix(const char* suffix);
 326   inline void add_suffix(const char* suffix);
 327   inline void reset_path(const char* base);
 328 
 329   inline const char* get_base()     const { return _items[_scp_base]; }
 330   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 331   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 332 
 333   // Combine all the components into a single c-heap-allocated string; caller
 334   // must free the string if/when no longer needed.
 335   char* combined_path();
 336 
 337 private:
 338   // Utility routines.
 339   static char* add_to_path(const char* path, const char* str, bool prepend);
 340   static char* add_jars_to_path(char* path, const char* directory);
 341 
 342   inline void reset_item_at(int index);
 343 
 344   // Array indices for the items that make up the sysclasspath.  All except the
 345   // base are allocated in the C heap and freed by this class.
 346   enum {
 347     _scp_prefix,        // from -Xbootclasspath/p:...
 348     _scp_base,          // the default sysclasspath
 349     _scp_suffix,        // from -Xbootclasspath/a:...
 350     _scp_nitems         // the number of items, must be last.
 351   };
 352 
 353   const char* _items[_scp_nitems];
 354 };
 355 
 356 SysClassPath::SysClassPath(const char* base) {
 357   memset(_items, 0, sizeof(_items));
 358   _items[_scp_base] = base;
 359 }
 360 
 361 SysClassPath::~SysClassPath() {
 362   // Free everything except the base.
 363   for (int i = 0; i < _scp_nitems; ++i) {
 364     if (i != _scp_base) reset_item_at(i);
 365   }
 366 }
 367 
 368 inline void SysClassPath::set_base(const char* base) {
 369   _items[_scp_base] = base;
 370 }
 371 
 372 inline void SysClassPath::add_prefix(const char* prefix) {
 373   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 374 }
 375 
 376 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 377   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 378 }
 379 
 380 inline void SysClassPath::add_suffix(const char* suffix) {
 381   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 382 }
 383 
 384 inline void SysClassPath::reset_item_at(int index) {
 385   assert(index < _scp_nitems && index != _scp_base, "just checking");
 386   if (_items[index] != NULL) {
 387     FREE_C_HEAP_ARRAY(char, _items[index]);
 388     _items[index] = NULL;
 389   }
 390 }
 391 
 392 inline void SysClassPath::reset_path(const char* base) {
 393   // Clear the prefix and suffix.
 394   reset_item_at(_scp_prefix);
 395   reset_item_at(_scp_suffix);
 396   set_base(base);
 397 }
 398 
 399 //------------------------------------------------------------------------------
 400 
 401 
 402 // Combine the bootclasspath elements, some of which may be null, into a single
 403 // c-heap-allocated string.
 404 char* SysClassPath::combined_path() {
 405   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 406 
 407   size_t lengths[_scp_nitems];
 408   size_t total_len = 0;
 409 
 410   const char separator = *os::path_separator();
 411 
 412   // Get the lengths.
 413   int i;
 414   for (i = 0; i < _scp_nitems; ++i) {
 415     if (_items[i] != NULL) {
 416       lengths[i] = strlen(_items[i]);
 417       // Include space for the separator char (or a NULL for the last item).
 418       total_len += lengths[i] + 1;
 419     }
 420   }
 421   assert(total_len > 0, "empty sysclasspath not allowed");
 422 
 423   // Copy the _items to a single string.
 424   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 425   char* cp_tmp = cp;
 426   for (i = 0; i < _scp_nitems; ++i) {
 427     if (_items[i] != NULL) {
 428       memcpy(cp_tmp, _items[i], lengths[i]);
 429       cp_tmp += lengths[i];
 430       *cp_tmp++ = separator;
 431     }
 432   }
 433   *--cp_tmp = '\0';     // Replace the extra separator.
 434   return cp;
 435 }
 436 
 437 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 438 char*
 439 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 440   char *cp;
 441 
 442   assert(str != NULL, "just checking");
 443   if (path == NULL) {
 444     size_t len = strlen(str) + 1;
 445     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 446     memcpy(cp, str, len);                       // copy the trailing null
 447   } else {
 448     const char separator = *os::path_separator();
 449     size_t old_len = strlen(path);
 450     size_t str_len = strlen(str);
 451     size_t len = old_len + str_len + 2;
 452 
 453     if (prepend) {
 454       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 455       char* cp_tmp = cp;
 456       memcpy(cp_tmp, str, str_len);
 457       cp_tmp += str_len;
 458       *cp_tmp = separator;
 459       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 460       FREE_C_HEAP_ARRAY(char, path);
 461     } else {
 462       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 463       char* cp_tmp = cp + old_len;
 464       *cp_tmp = separator;
 465       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 466     }
 467   }
 468   return cp;
 469 }
 470 
 471 // Scan the directory and append any jar or zip files found to path.
 472 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 473 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 474   DIR* dir = os::opendir(directory);
 475   if (dir == NULL) return path;
 476 
 477   char dir_sep[2] = { '\0', '\0' };
 478   size_t directory_len = strlen(directory);
 479   const char fileSep = *os::file_separator();
 480   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 481 
 482   /* Scan the directory for jars/zips, appending them to path. */
 483   struct dirent *entry;
 484   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 485   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 486     const char* name = entry->d_name;
 487     const char* ext = name + strlen(name) - 4;
 488     bool isJarOrZip = ext > name &&
 489       (os::file_name_strcmp(ext, ".jar") == 0 ||
 490        os::file_name_strcmp(ext, ".zip") == 0);
 491     if (isJarOrZip) {
 492       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 493       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 494       path = add_to_path(path, jarpath, false);
 495       FREE_C_HEAP_ARRAY(char, jarpath);
 496     }
 497   }
 498   FREE_C_HEAP_ARRAY(char, dbuf);
 499   os::closedir(dir);
 500   return path;
 501 }
 502 
 503 // Parses a memory size specification string.
 504 static bool atomull(const char *s, julong* result) {
 505   julong n = 0;
 506   int args_read = 0;
 507   bool is_hex = false;
 508   // Skip leading 0[xX] for hexadecimal
 509   if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
 510     s += 2;
 511     is_hex = true;
 512     args_read = sscanf(s, JULONG_FORMAT_X, &n);
 513   } else {
 514     args_read = sscanf(s, JULONG_FORMAT, &n);
 515   }
 516   if (args_read != 1) {
 517     return false;
 518   }
 519   while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
 520     s++;
 521   }
 522   // 4705540: illegal if more characters are found after the first non-digit
 523   if (strlen(s) > 1) {
 524     return false;
 525   }
 526   switch (*s) {
 527     case 'T': case 't':
 528       *result = n * G * K;
 529       // Check for overflow.
 530       if (*result/((julong)G * K) != n) return false;
 531       return true;
 532     case 'G': case 'g':
 533       *result = n * G;
 534       if (*result/G != n) return false;
 535       return true;
 536     case 'M': case 'm':
 537       *result = n * M;
 538       if (*result/M != n) return false;
 539       return true;
 540     case 'K': case 'k':
 541       *result = n * K;
 542       if (*result/K != n) return false;
 543       return true;
 544     case '\0':
 545       *result = n;
 546       return true;
 547     default:
 548       return false;
 549   }
 550 }
 551 
 552 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 553   if (size < min_size) return arg_too_small;
 554   // Check that size will fit in a size_t (only relevant on 32-bit)
 555   if (size > max_uintx) return arg_too_big;
 556   return arg_in_range;
 557 }
 558 
 559 // Describe an argument out of range error
 560 void Arguments::describe_range_error(ArgsRange errcode) {
 561   switch(errcode) {
 562   case arg_too_big:
 563     jio_fprintf(defaultStream::error_stream(),
 564                 "The specified size exceeds the maximum "
 565                 "representable size.\n");
 566     break;
 567   case arg_too_small:
 568   case arg_unreadable:
 569   case arg_in_range:
 570     // do nothing for now
 571     break;
 572   default:
 573     ShouldNotReachHere();
 574   }
 575 }
 576 
 577 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 578   if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
 579     return true;
 580   } else {
 581     return false;
 582   }
 583 }
 584 
 585 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 586   double v;
 587   if (sscanf(value, "%lf", &v) != 1) {
 588     return false;
 589   }
 590 
 591   if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
 592     return true;
 593   }
 594   return false;
 595 }
 596 
 597 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 598   julong v;
 599   int int_v;
 600   intx intx_v;
 601   bool is_neg = false;
 602   // Check the sign first since atomull() parses only unsigned values.
 603   if (*value == '-') {
 604     if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
 605       return false;
 606     }
 607     value++;
 608     is_neg = true;
 609   }
 610   if (!atomull(value, &v)) {
 611     return false;
 612   }
 613   int_v = (int) v;
 614   if (is_neg) {
 615     int_v = -int_v;
 616   }
 617   if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
 618     return true;
 619   }
 620   uint uint_v = (uint) v;
 621   if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
 622     return true;
 623   }
 624   intx_v = (intx) v;
 625   if (is_neg) {
 626     intx_v = -intx_v;
 627   }
 628   if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
 629     return true;
 630   }
 631   uintx uintx_v = (uintx) v;
 632   if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
 633     return true;
 634   }
 635   uint64_t uint64_t_v = (uint64_t) v;
 636   if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
 637     return true;
 638   }
 639   size_t size_t_v = (size_t) v;
 640   if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
 641     return true;
 642   }
 643   return false;
 644 }
 645 
 646 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 647   if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
 648   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 649   FREE_C_HEAP_ARRAY(char, value);
 650   return true;
 651 }
 652 
 653 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 654   const char* old_value = "";
 655   if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
 656   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 657   size_t new_len = strlen(new_value);
 658   const char* value;
 659   char* free_this_too = NULL;
 660   if (old_len == 0) {
 661     value = new_value;
 662   } else if (new_len == 0) {
 663     value = old_value;
 664   } else {
 665     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 666     // each new setting adds another LINE to the switch:
 667     sprintf(buf, "%s\n%s", old_value, new_value);
 668     value = buf;
 669     free_this_too = buf;
 670   }
 671   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 672   // CommandLineFlags always returns a pointer that needs freeing.
 673   FREE_C_HEAP_ARRAY(char, value);
 674   if (free_this_too != NULL) {
 675     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 676     FREE_C_HEAP_ARRAY(char, free_this_too);
 677   }
 678   return true;
 679 }
 680 
 681 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 682 
 683   // range of acceptable characters spelled out for portability reasons
 684 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 685 #define BUFLEN 255
 686   char name[BUFLEN+1];
 687   char dummy;
 688 
 689   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 690     return set_bool_flag(name, false, origin);
 691   }
 692   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 693     return set_bool_flag(name, true, origin);
 694   }
 695 
 696   char punct;
 697   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 698     const char* value = strchr(arg, '=') + 1;
 699     Flag* flag = Flag::find_flag(name, strlen(name));
 700     if (flag != NULL && flag->is_ccstr()) {
 701       if (flag->ccstr_accumulates()) {
 702         return append_to_string_flag(name, value, origin);
 703       } else {
 704         if (value[0] == '\0') {
 705           value = NULL;
 706         }
 707         return set_string_flag(name, value, origin);
 708       }
 709     }
 710   }
 711 
 712   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 713     const char* value = strchr(arg, '=') + 1;
 714     // -XX:Foo:=xxx will reset the string flag to the given value.
 715     if (value[0] == '\0') {
 716       value = NULL;
 717     }
 718     return set_string_flag(name, value, origin);
 719   }
 720 
 721 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 722 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 723 #define        NUMBER_RANGE    "[0123456789]"
 724   char value[BUFLEN + 1];
 725   char value2[BUFLEN + 1];
 726   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 727     // Looks like a floating-point number -- try again with more lenient format string
 728     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 729       return set_fp_numeric_flag(name, value, origin);
 730     }
 731   }
 732 
 733 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 734   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 735     return set_numeric_flag(name, value, origin);
 736   }
 737 
 738   return false;
 739 }
 740 
 741 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 742   assert(bldarray != NULL, "illegal argument");
 743 
 744   if (arg == NULL) {
 745     return;
 746   }
 747 
 748   int new_count = *count + 1;
 749 
 750   // expand the array and add arg to the last element
 751   if (*bldarray == NULL) {
 752     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 753   } else {
 754     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 755   }
 756   (*bldarray)[*count] = os::strdup_check_oom(arg);
 757   *count = new_count;
 758 }
 759 
 760 void Arguments::build_jvm_args(const char* arg) {
 761   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 762 }
 763 
 764 void Arguments::build_jvm_flags(const char* arg) {
 765   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 766 }
 767 
 768 // utility function to return a string that concatenates all
 769 // strings in a given char** array
 770 const char* Arguments::build_resource_string(char** args, int count) {
 771   if (args == NULL || count == 0) {
 772     return NULL;
 773   }
 774   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 775   for (int i = 1; i < count; i++) {
 776     length += strlen(args[i]) + 1; // add 1 for a space
 777   }
 778   char* s = NEW_RESOURCE_ARRAY(char, length);
 779   strcpy(s, args[0]);
 780   for (int j = 1; j < count; j++) {
 781     strcat(s, " ");
 782     strcat(s, args[j]);
 783   }
 784   return (const char*) s;
 785 }
 786 
 787 void Arguments::print_on(outputStream* st) {
 788   st->print_cr("VM Arguments:");
 789   if (num_jvm_flags() > 0) {
 790     st->print("jvm_flags: "); print_jvm_flags_on(st);
 791     st->cr();
 792   }
 793   if (num_jvm_args() > 0) {
 794     st->print("jvm_args: "); print_jvm_args_on(st);
 795     st->cr();
 796   }
 797   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 798   if (_java_class_path != NULL) {
 799     char* path = _java_class_path->value();
 800     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 801   }
 802   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 803 }
 804 
 805 void Arguments::print_summary_on(outputStream* st) {
 806   // Print the command line.  Environment variables that are helpful for
 807   // reproducing the problem are written later in the hs_err file.
 808   // flags are from setting file
 809   if (num_jvm_flags() > 0) {
 810     st->print_raw("Settings File: ");
 811     print_jvm_flags_on(st);
 812     st->cr();
 813   }
 814   // args are the command line and environment variable arguments.
 815   st->print_raw("Command Line: ");
 816   if (num_jvm_args() > 0) {
 817     print_jvm_args_on(st);
 818   }
 819   // this is the classfile and any arguments to the java program
 820   if (java_command() != NULL) {
 821     st->print("%s", java_command());
 822   }
 823   st->cr();
 824 }
 825 
 826 void Arguments::print_jvm_flags_on(outputStream* st) {
 827   if (_num_jvm_flags > 0) {
 828     for (int i=0; i < _num_jvm_flags; i++) {
 829       st->print("%s ", _jvm_flags_array[i]);
 830     }
 831   }
 832 }
 833 
 834 void Arguments::print_jvm_args_on(outputStream* st) {
 835   if (_num_jvm_args > 0) {
 836     for (int i=0; i < _num_jvm_args; i++) {
 837       st->print("%s ", _jvm_args_array[i]);
 838     }
 839   }
 840 }
 841 
 842 bool Arguments::process_argument(const char* arg,
 843     jboolean ignore_unrecognized, Flag::Flags origin) {
 844 
 845   JDK_Version since = JDK_Version();
 846 
 847   if (parse_argument(arg, origin) || ignore_unrecognized) {
 848     return true;
 849   }
 850 
 851   // Determine if the flag has '+', '-', or '=' characters.
 852   bool has_plus_minus = (*arg == '+' || *arg == '-');
 853   const char* const argname = has_plus_minus ? arg + 1 : arg;
 854 
 855   size_t arg_len;
 856   const char* equal_sign = strchr(argname, '=');
 857   if (equal_sign == NULL) {
 858     arg_len = strlen(argname);
 859   } else {
 860     arg_len = equal_sign - argname;
 861   }
 862 
 863   // Only make the obsolete check for valid arguments.
 864   if (arg_len <= BUFLEN) {
 865     // Construct a string which consists only of the argument name without '+', '-', or '='.
 866     char stripped_argname[BUFLEN+1];
 867     strncpy(stripped_argname, argname, arg_len);
 868     stripped_argname[arg_len] = '\0';  // strncpy may not null terminate.
 869 
 870     if (is_newly_obsolete(stripped_argname, &since)) {
 871       char version[256];
 872       since.to_string(version, sizeof(version));
 873       warning("ignoring option %s; support was removed in %s", stripped_argname, version);
 874       return true;
 875     }
 876   }
 877 
 878   // For locked flags, report a custom error message if available.
 879   // Otherwise, report the standard unrecognized VM option.
 880   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 881   if (found_flag != NULL) {
 882     char locked_message_buf[BUFLEN];
 883     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 884     if (strlen(locked_message_buf) == 0) {
 885       if (found_flag->is_bool() && !has_plus_minus) {
 886         jio_fprintf(defaultStream::error_stream(),
 887           "Missing +/- setting for VM option '%s'\n", argname);
 888       } else if (!found_flag->is_bool() && has_plus_minus) {
 889         jio_fprintf(defaultStream::error_stream(),
 890           "Unexpected +/- setting in VM option '%s'\n", argname);
 891       } else {
 892         jio_fprintf(defaultStream::error_stream(),
 893           "Improperly specified VM option '%s'\n", argname);
 894       }
 895     } else {
 896       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 897     }
 898   } else {
 899     jio_fprintf(defaultStream::error_stream(),
 900                 "Unrecognized VM option '%s'\n", argname);
 901     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 902     if (fuzzy_matched != NULL) {
 903       jio_fprintf(defaultStream::error_stream(),
 904                   "Did you mean '%s%s%s'? ",
 905                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 906                   fuzzy_matched->_name,
 907                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 908     }
 909   }
 910 
 911   // allow for commandline "commenting out" options like -XX:#+Verbose
 912   return arg[0] == '#';
 913 }
 914 
 915 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 916   FILE* stream = fopen(file_name, "rb");
 917   if (stream == NULL) {
 918     if (should_exist) {
 919       jio_fprintf(defaultStream::error_stream(),
 920                   "Could not open settings file %s\n", file_name);
 921       return false;
 922     } else {
 923       return true;
 924     }
 925   }
 926 
 927   char token[1024];
 928   int  pos = 0;
 929 
 930   bool in_white_space = true;
 931   bool in_comment     = false;
 932   bool in_quote       = false;
 933   char quote_c        = 0;
 934   bool result         = true;
 935 
 936   int c = getc(stream);
 937   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 938     if (in_white_space) {
 939       if (in_comment) {
 940         if (c == '\n') in_comment = false;
 941       } else {
 942         if (c == '#') in_comment = true;
 943         else if (!isspace(c)) {
 944           in_white_space = false;
 945           token[pos++] = c;
 946         }
 947       }
 948     } else {
 949       if (c == '\n' || (!in_quote && isspace(c))) {
 950         // token ends at newline, or at unquoted whitespace
 951         // this allows a way to include spaces in string-valued options
 952         token[pos] = '\0';
 953         logOption(token);
 954         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 955         build_jvm_flags(token);
 956         pos = 0;
 957         in_white_space = true;
 958         in_quote = false;
 959       } else if (!in_quote && (c == '\'' || c == '"')) {
 960         in_quote = true;
 961         quote_c = c;
 962       } else if (in_quote && (c == quote_c)) {
 963         in_quote = false;
 964       } else {
 965         token[pos++] = c;
 966       }
 967     }
 968     c = getc(stream);
 969   }
 970   if (pos > 0) {
 971     token[pos] = '\0';
 972     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 973     build_jvm_flags(token);
 974   }
 975   fclose(stream);
 976   return result;
 977 }
 978 
 979 //=============================================================================================================
 980 // Parsing of properties (-D)
 981 
 982 const char* Arguments::get_property(const char* key) {
 983   return PropertyList_get_value(system_properties(), key);
 984 }
 985 
 986 bool Arguments::add_property(const char* prop) {
 987   const char* eq = strchr(prop, '=');
 988   char* key;
 989   // ns must be static--its address may be stored in a SystemProperty object.
 990   const static char ns[1] = {0};
 991   char* value = (char *)ns;
 992 
 993   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
 994   key = AllocateHeap(key_len + 1, mtInternal);
 995   strncpy(key, prop, key_len);
 996   key[key_len] = '\0';
 997 
 998   if (eq != NULL) {
 999     size_t value_len = strlen(prop) - key_len - 1;
1000     value = AllocateHeap(value_len + 1, mtInternal);
1001     strncpy(value, &prop[key_len + 1], value_len + 1);
1002   }
1003 
1004   if (strcmp(key, "java.compiler") == 0) {
1005     process_java_compiler_argument(value);
1006     FreeHeap(key);
1007     if (eq != NULL) {
1008       FreeHeap(value);
1009     }
1010     return true;
1011   } else if (strcmp(key, "sun.java.command") == 0) {
1012     _java_command = value;
1013 
1014     // Record value in Arguments, but let it get passed to Java.
1015   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1016              strcmp(key, "sun.java.launcher.pid") == 0) {
1017     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1018     // private and are processed in process_sun_java_launcher_properties();
1019     // the sun.java.launcher property is passed on to the java application
1020     FreeHeap(key);
1021     if (eq != NULL) {
1022       FreeHeap(value);
1023     }
1024     return true;
1025   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1026     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1027     // its value without going through the property list or making a Java call.
1028     _java_vendor_url_bug = value;
1029   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1030     PropertyList_unique_add(&_system_properties, key, value, true);
1031     return true;
1032   }
1033   // Create new property and add at the end of the list
1034   PropertyList_unique_add(&_system_properties, key, value);
1035   return true;
1036 }
1037 
1038 //===========================================================================================================
1039 // Setting int/mixed/comp mode flags
1040 
1041 void Arguments::set_mode_flags(Mode mode) {
1042   // Set up default values for all flags.
1043   // If you add a flag to any of the branches below,
1044   // add a default value for it here.
1045   set_java_compiler(false);
1046   _mode                      = mode;
1047 
1048   // Ensure Agent_OnLoad has the correct initial values.
1049   // This may not be the final mode; mode may change later in onload phase.
1050   PropertyList_unique_add(&_system_properties, "java.vm.info",
1051                           (char*)VM_Version::vm_info_string(), false);
1052 
1053   UseInterpreter             = true;
1054   UseCompiler                = true;
1055   UseLoopCounter             = true;
1056 
1057   // Default values may be platform/compiler dependent -
1058   // use the saved values
1059   ClipInlining               = Arguments::_ClipInlining;
1060   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1061   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1062   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1063   if (TieredCompilation) {
1064     if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1065       Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1066     }
1067     if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1068       Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1069     }
1070   }
1071 
1072   // Change from defaults based on mode
1073   switch (mode) {
1074   default:
1075     ShouldNotReachHere();
1076     break;
1077   case _int:
1078     UseCompiler              = false;
1079     UseLoopCounter           = false;
1080     AlwaysCompileLoopMethods = false;
1081     UseOnStackReplacement    = false;
1082     break;
1083   case _mixed:
1084     // same as default
1085     break;
1086   case _comp:
1087     UseInterpreter           = false;
1088     BackgroundCompilation    = false;
1089     ClipInlining             = false;
1090     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1091     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1092     // compile a level 4 (C2) and then continue executing it.
1093     if (TieredCompilation) {
1094       Tier3InvokeNotifyFreqLog = 0;
1095       Tier4InvocationThreshold = 0;
1096     }
1097     break;
1098   }
1099 }
1100 
1101 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1102 // Conflict: required to use shared spaces (-Xshare:on), but
1103 // incompatible command line options were chosen.
1104 
1105 static void no_shared_spaces(const char* message) {
1106   if (RequireSharedSpaces) {
1107     jio_fprintf(defaultStream::error_stream(),
1108       "Class data sharing is inconsistent with other specified options.\n");
1109     vm_exit_during_initialization("Unable to use shared archive.", message);
1110   } else {
1111     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1112   }
1113 }
1114 #endif
1115 
1116 // Returns threshold scaled with the value of scale.
1117 // If scale < 0.0, threshold is returned without scaling.
1118 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1119   if (scale == 1.0 || scale < 0.0) {
1120     return threshold;
1121   } else {
1122     return (intx)(threshold * scale);
1123   }
1124 }
1125 
1126 // Returns freq_log scaled with the value of scale.
1127 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1128 // If scale < 0.0, freq_log is returned without scaling.
1129 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1130   // Check if scaling is necessary or if negative value was specified.
1131   if (scale == 1.0 || scale < 0.0) {
1132     return freq_log;
1133   }
1134   // Check values to avoid calculating log2 of 0.
1135   if (scale == 0.0 || freq_log == 0) {
1136     return 0;
1137   }
1138   // Determine the maximum notification frequency value currently supported.
1139   // The largest mask value that the interpreter/C1 can handle is
1140   // of length InvocationCounter::number_of_count_bits. Mask values are always
1141   // one bit shorter then the value of the notification frequency. Set
1142   // max_freq_bits accordingly.
1143   intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1144   intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1145   if (scaled_freq == 0) {
1146     // Return 0 right away to avoid calculating log2 of 0.
1147     return 0;
1148   } else if (scaled_freq > nth_bit(max_freq_bits)) {
1149     return max_freq_bits;
1150   } else {
1151     return log2_intptr(scaled_freq);
1152   }
1153 }
1154 
1155 void Arguments::set_tiered_flags() {
1156   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1157   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1158     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1159   }
1160   if (CompilationPolicyChoice < 2) {
1161     vm_exit_during_initialization(
1162       "Incompatible compilation policy selected", NULL);
1163   }
1164   // Increase the code cache size - tiered compiles a lot more.
1165   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1166     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1167                   MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1168   }
1169   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1170   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1171     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1172 
1173     if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1174       // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1175       if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1176         FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1177       }
1178       if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1179         FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1180       }
1181       // Check consistency of code heap sizes
1182       if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1183         jio_fprintf(defaultStream::error_stream(),
1184                     "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1185                     NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1186                     (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1187         vm_exit(1);
1188       }
1189     }
1190   }
1191   if (!UseInterpreter) { // -Xcomp
1192     Tier3InvokeNotifyFreqLog = 0;
1193     Tier4InvocationThreshold = 0;
1194   }
1195 
1196   if (CompileThresholdScaling < 0) {
1197     vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1198   }
1199 
1200   // Scale tiered compilation thresholds.
1201   // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1202   if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1203     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1204     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1205 
1206     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1207     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1208     FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1209     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1210 
1211     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1212     // once these thresholds become supported.
1213 
1214     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1215     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1216 
1217     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1218     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1219 
1220     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1221 
1222     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1223     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1224     FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1225     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1226   }
1227 }
1228 
1229 #if INCLUDE_ALL_GCS
1230 static void disable_adaptive_size_policy(const char* collector_name) {
1231   if (UseAdaptiveSizePolicy) {
1232     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1233       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1234               collector_name);
1235     }
1236     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1237   }
1238 }
1239 
1240 void Arguments::set_parnew_gc_flags() {
1241   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1242          "control point invariant");
1243   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1244   assert(UseParNewGC, "ParNew should always be used with CMS");
1245 
1246   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1247     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1248     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1249   } else if (ParallelGCThreads == 0) {
1250     jio_fprintf(defaultStream::error_stream(),
1251         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1252     vm_exit(1);
1253   }
1254 
1255   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1256   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1257   // we set them to 1024 and 1024.
1258   // See CR 6362902.
1259   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1260     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1261   }
1262   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1263     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1264   }
1265 
1266   // When using compressed oops, we use local overflow stacks,
1267   // rather than using a global overflow list chained through
1268   // the klass word of the object's pre-image.
1269   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1270     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1271       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1272     }
1273     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1274   }
1275   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1276 }
1277 
1278 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1279 // sparc/solaris for certain applications, but would gain from
1280 // further optimization and tuning efforts, and would almost
1281 // certainly gain from analysis of platform and environment.
1282 void Arguments::set_cms_and_parnew_gc_flags() {
1283   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1284   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1285   assert(UseParNewGC, "ParNew should always be used with CMS");
1286 
1287   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1288   disable_adaptive_size_policy("UseConcMarkSweepGC");
1289 
1290   set_parnew_gc_flags();
1291 
1292   size_t max_heap = align_size_down(MaxHeapSize,
1293                                     CardTableRS::ct_max_alignment_constraint());
1294 
1295   // Now make adjustments for CMS
1296   intx   tenuring_default = (intx)6;
1297   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1298 
1299   // Preferred young gen size for "short" pauses:
1300   // upper bound depends on # of threads and NewRatio.
1301   const size_t preferred_max_new_size_unaligned =
1302     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1303   size_t preferred_max_new_size =
1304     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1305 
1306   // Unless explicitly requested otherwise, size young gen
1307   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1308 
1309   // If either MaxNewSize or NewRatio is set on the command line,
1310   // assume the user is trying to set the size of the young gen.
1311   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1312 
1313     // Set MaxNewSize to our calculated preferred_max_new_size unless
1314     // NewSize was set on the command line and it is larger than
1315     // preferred_max_new_size.
1316     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1317       FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1318     } else {
1319       FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1320     }
1321     if (PrintGCDetails && Verbose) {
1322       // Too early to use gclog_or_tty
1323       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1324     }
1325 
1326     // Code along this path potentially sets NewSize and OldSize
1327     if (PrintGCDetails && Verbose) {
1328       // Too early to use gclog_or_tty
1329       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1330            " initial_heap_size:  " SIZE_FORMAT
1331            " max_heap: " SIZE_FORMAT,
1332            min_heap_size(), InitialHeapSize, max_heap);
1333     }
1334     size_t min_new = preferred_max_new_size;
1335     if (FLAG_IS_CMDLINE(NewSize)) {
1336       min_new = NewSize;
1337     }
1338     if (max_heap > min_new && min_heap_size() > min_new) {
1339       // Unless explicitly requested otherwise, make young gen
1340       // at least min_new, and at most preferred_max_new_size.
1341       if (FLAG_IS_DEFAULT(NewSize)) {
1342         FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1343         FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1344         if (PrintGCDetails && Verbose) {
1345           // Too early to use gclog_or_tty
1346           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1347         }
1348       }
1349       // Unless explicitly requested otherwise, size old gen
1350       // so it's NewRatio x of NewSize.
1351       if (FLAG_IS_DEFAULT(OldSize)) {
1352         if (max_heap > NewSize) {
1353           FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1354           if (PrintGCDetails && Verbose) {
1355             // Too early to use gclog_or_tty
1356             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1357           }
1358         }
1359       }
1360     }
1361   }
1362   // Unless explicitly requested otherwise, definitely
1363   // promote all objects surviving "tenuring_default" scavenges.
1364   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1365       FLAG_IS_DEFAULT(SurvivorRatio)) {
1366     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1367   }
1368   // If we decided above (or user explicitly requested)
1369   // `promote all' (via MaxTenuringThreshold := 0),
1370   // prefer minuscule survivor spaces so as not to waste
1371   // space for (non-existent) survivors
1372   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1373     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1374   }
1375 
1376   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1377   // but rather the number of free blocks of a given size that are used when
1378   // replenishing the local per-worker free list caches.
1379   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1380     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1381       // OldPLAB sizing manually turned off: Use a larger default setting,
1382       // unless it was manually specified. This is because a too-low value
1383       // will slow down scavenges.
1384       FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1385     } else {
1386       FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1387     }
1388   }
1389 
1390   // If either of the static initialization defaults have changed, note this
1391   // modification.
1392   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1393     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1394   }
1395 
1396   if (!ClassUnloading) {
1397     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1398     FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1399   }
1400 
1401   if (PrintGCDetails && Verbose) {
1402     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1403       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1404     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1405   }
1406 }
1407 #endif // INCLUDE_ALL_GCS
1408 
1409 void set_object_alignment() {
1410   // Object alignment.
1411   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1412   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1413   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1414   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1415   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1416   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1417 
1418   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1419   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1420 
1421   // Oop encoding heap max
1422   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1423 
1424   if (SurvivorAlignmentInBytes == 0) {
1425     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1426   }
1427 
1428 #if INCLUDE_ALL_GCS
1429   // Set CMS global values
1430   CompactibleFreeListSpace::set_cms_values();
1431 #endif // INCLUDE_ALL_GCS
1432 }
1433 
1434 size_t Arguments::max_heap_for_compressed_oops() {
1435   // Avoid sign flip.
1436   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1437   // We need to fit both the NULL page and the heap into the memory budget, while
1438   // keeping alignment constraints of the heap. To guarantee the latter, as the
1439   // NULL page is located before the heap, we pad the NULL page to the conservative
1440   // maximum alignment that the GC may ever impose upon the heap.
1441   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1442                                                         _conservative_max_heap_alignment);
1443 
1444   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1445   NOT_LP64(ShouldNotReachHere(); return 0);
1446 }
1447 
1448 bool Arguments::should_auto_select_low_pause_collector() {
1449   if (UseAutoGCSelectPolicy &&
1450       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1451       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1452     if (PrintGCDetails) {
1453       // Cannot use gclog_or_tty yet.
1454       tty->print_cr("Automatic selection of the low pause collector"
1455        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1456     }
1457     return true;
1458   }
1459   return false;
1460 }
1461 
1462 void Arguments::set_use_compressed_oops() {
1463 #ifndef ZERO
1464 #ifdef _LP64
1465   // MaxHeapSize is not set up properly at this point, but
1466   // the only value that can override MaxHeapSize if we are
1467   // to use UseCompressedOops is InitialHeapSize.
1468   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1469 
1470   if (max_heap_size <= max_heap_for_compressed_oops()) {
1471 #if !defined(COMPILER1) || defined(TIERED)
1472     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1473       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1474     }
1475 #endif
1476   } else {
1477     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1478       warning("Max heap size too large for Compressed Oops");
1479       FLAG_SET_DEFAULT(UseCompressedOops, false);
1480       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1481     }
1482   }
1483 #endif // _LP64
1484 #endif // ZERO
1485 }
1486 
1487 
1488 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1489 // set_use_compressed_oops().
1490 void Arguments::set_use_compressed_klass_ptrs() {
1491 #ifndef ZERO
1492 #ifdef _LP64
1493   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1494   if (!UseCompressedOops) {
1495     if (UseCompressedClassPointers) {
1496       warning("UseCompressedClassPointers requires UseCompressedOops");
1497     }
1498     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1499   } else {
1500     // Turn on UseCompressedClassPointers too
1501     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1502       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1503     }
1504     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1505     if (UseCompressedClassPointers) {
1506       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1507         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1508         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1509       }
1510     }
1511   }
1512 #endif // _LP64
1513 #endif // !ZERO
1514 }
1515 
1516 void Arguments::set_conservative_max_heap_alignment() {
1517   // The conservative maximum required alignment for the heap is the maximum of
1518   // the alignments imposed by several sources: any requirements from the heap
1519   // itself, the collector policy and the maximum page size we may run the VM
1520   // with.
1521   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1522 #if INCLUDE_ALL_GCS
1523   if (UseParallelGC) {
1524     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1525   } else if (UseG1GC) {
1526     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1527   }
1528 #endif // INCLUDE_ALL_GCS
1529   _conservative_max_heap_alignment = MAX4(heap_alignment,
1530                                           (size_t)os::vm_allocation_granularity(),
1531                                           os::max_page_size(),
1532                                           CollectorPolicy::compute_heap_alignment());
1533 }
1534 
1535 void Arguments::select_gc_ergonomically() {
1536   if (os::is_server_class_machine()) {
1537     if (should_auto_select_low_pause_collector()) {
1538       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1539     } else {
1540 #if defined(JAVASE_EMBEDDED)
1541       FLAG_SET_ERGO(bool, UseParallelGC, true);
1542 #else
1543       FLAG_SET_ERGO(bool, UseG1GC, true);
1544 #endif
1545     }
1546   } else {
1547     FLAG_SET_ERGO(bool, UseSerialGC, true);
1548   }
1549 }
1550 
1551 void Arguments::select_gc() {
1552   if (!gc_selected()) {
1553     select_gc_ergonomically();
1554     guarantee(gc_selected(), "No GC selected");
1555   }
1556 }
1557 
1558 void Arguments::set_ergonomics_flags() {
1559   select_gc();
1560 
1561 #ifdef COMPILER2
1562   // Shared spaces work fine with other GCs but causes bytecode rewriting
1563   // to be disabled, which hurts interpreter performance and decreases
1564   // server performance.  When -server is specified, keep the default off
1565   // unless it is asked for.  Future work: either add bytecode rewriting
1566   // at link time, or rewrite bytecodes in non-shared methods.
1567   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1568       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1569     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1570   }
1571 #endif
1572 
1573   set_conservative_max_heap_alignment();
1574 
1575 #ifndef ZERO
1576 #ifdef _LP64
1577   set_use_compressed_oops();
1578 
1579   // set_use_compressed_klass_ptrs() must be called after calling
1580   // set_use_compressed_oops().
1581   set_use_compressed_klass_ptrs();
1582 
1583   // Also checks that certain machines are slower with compressed oops
1584   // in vm_version initialization code.
1585 #endif // _LP64
1586 #endif // !ZERO
1587 
1588   // Set up runtime image flags.
1589   set_runtime_image_flags();
1590 
1591   CodeCacheExtensions::set_ergonomics_flags();
1592 }
1593 
1594 void Arguments::set_parallel_gc_flags() {
1595   assert(UseParallelGC || UseParallelOldGC, "Error");
1596   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1597   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1598     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1599   }
1600   FLAG_SET_DEFAULT(UseParallelGC, true);
1601 
1602   // If no heap maximum was requested explicitly, use some reasonable fraction
1603   // of the physical memory, up to a maximum of 1GB.
1604   FLAG_SET_DEFAULT(ParallelGCThreads,
1605                    Abstract_VM_Version::parallel_worker_threads());
1606   if (ParallelGCThreads == 0) {
1607     jio_fprintf(defaultStream::error_stream(),
1608         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1609     vm_exit(1);
1610   }
1611 
1612   if (UseAdaptiveSizePolicy) {
1613     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1614     // unless the user actually sets these flags.
1615     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1616       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1617       _min_heap_free_ratio = MinHeapFreeRatio;
1618     }
1619     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1620       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1621       _max_heap_free_ratio = MaxHeapFreeRatio;
1622     }
1623   }
1624 
1625   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1626   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1627   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1628   // See CR 6362902 for details.
1629   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1630     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1631        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1632     }
1633     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1634       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1635     }
1636   }
1637 
1638   if (UseParallelOldGC) {
1639     // Par compact uses lower default values since they are treated as
1640     // minimums.  These are different defaults because of the different
1641     // interpretation and are not ergonomically set.
1642     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1643       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1644     }
1645   }
1646 }
1647 
1648 void Arguments::set_g1_gc_flags() {
1649   assert(UseG1GC, "Error");
1650 #ifdef COMPILER1
1651   FastTLABRefill = false;
1652 #endif
1653   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1654   if (ParallelGCThreads == 0) {
1655     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1656     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1657   }
1658 
1659 #if INCLUDE_ALL_GCS
1660   if (G1ConcRefinementThreads == 0) {
1661     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1662   }
1663 #endif
1664 
1665   // MarkStackSize will be set (if it hasn't been set by the user)
1666   // when concurrent marking is initialized.
1667   // Its value will be based upon the number of parallel marking threads.
1668   // But we do set the maximum mark stack size here.
1669   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1670     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1671   }
1672 
1673   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1674     // In G1, we want the default GC overhead goal to be higher than
1675     // say in PS. So we set it here to 10%. Otherwise the heap might
1676     // be expanded more aggressively than we would like it to. In
1677     // fact, even 10% seems to not be high enough in some cases
1678     // (especially small GC stress tests that the main thing they do
1679     // is allocation). We might consider increase it further.
1680     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1681   }
1682 
1683   if (PrintGCDetails && Verbose) {
1684     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1685       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1686     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1687   }
1688 }
1689 
1690 #if !INCLUDE_ALL_GCS
1691 #ifdef ASSERT
1692 static bool verify_serial_gc_flags() {
1693   return (UseSerialGC &&
1694         !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1695           UseParallelGC || UseParallelOldGC));
1696 }
1697 #endif // ASSERT
1698 #endif // INCLUDE_ALL_GCS
1699 
1700 void Arguments::set_gc_specific_flags() {
1701 #if INCLUDE_ALL_GCS
1702   // Set per-collector flags
1703   if (UseParallelGC || UseParallelOldGC) {
1704     set_parallel_gc_flags();
1705   } else if (UseConcMarkSweepGC) {
1706     set_cms_and_parnew_gc_flags();
1707   } else if (UseG1GC) {
1708     set_g1_gc_flags();
1709   }
1710   check_deprecated_gc_flags();
1711   if (AssumeMP && !UseSerialGC) {
1712     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1713       warning("If the number of processors is expected to increase from one, then"
1714               " you should configure the number of parallel GC threads appropriately"
1715               " using -XX:ParallelGCThreads=N");
1716     }
1717   }
1718   if (MinHeapFreeRatio == 100) {
1719     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1720     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1721   }
1722 #else // INCLUDE_ALL_GCS
1723   assert(verify_serial_gc_flags(), "SerialGC unset");
1724 #endif // INCLUDE_ALL_GCS
1725 }
1726 
1727 julong Arguments::limit_by_allocatable_memory(julong limit) {
1728   julong max_allocatable;
1729   julong result = limit;
1730   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1731     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1732   }
1733   return result;
1734 }
1735 
1736 // Use static initialization to get the default before parsing
1737 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1738 
1739 void Arguments::set_heap_size() {
1740   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1741     // Deprecated flag
1742     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1743   }
1744 
1745   const julong phys_mem =
1746     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1747                             : (julong)MaxRAM;
1748 
1749   // If the maximum heap size has not been set with -Xmx,
1750   // then set it as fraction of the size of physical memory,
1751   // respecting the maximum and minimum sizes of the heap.
1752   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1753     julong reasonable_max = phys_mem / MaxRAMFraction;
1754 
1755     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1756       // Small physical memory, so use a minimum fraction of it for the heap
1757       reasonable_max = phys_mem / MinRAMFraction;
1758     } else {
1759       // Not-small physical memory, so require a heap at least
1760       // as large as MaxHeapSize
1761       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1762     }
1763     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1764       // Limit the heap size to ErgoHeapSizeLimit
1765       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1766     }
1767     if (UseCompressedOops) {
1768       // Limit the heap size to the maximum possible when using compressed oops
1769       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1770 
1771       // HeapBaseMinAddress can be greater than default but not less than.
1772       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1773         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1774           // matches compressed oops printing flags
1775           if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1776             jio_fprintf(defaultStream::error_stream(),
1777                         "HeapBaseMinAddress must be at least " SIZE_FORMAT
1778                         " (" SIZE_FORMAT "G) which is greater than value given "
1779                         SIZE_FORMAT "\n",
1780                         DefaultHeapBaseMinAddress,
1781                         DefaultHeapBaseMinAddress/G,
1782                         HeapBaseMinAddress);
1783           }
1784           FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1785         }
1786       }
1787 
1788       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1789         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1790         // but it should be not less than default MaxHeapSize.
1791         max_coop_heap -= HeapBaseMinAddress;
1792       }
1793       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1794     }
1795     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1796 
1797     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1798       // An initial heap size was specified on the command line,
1799       // so be sure that the maximum size is consistent.  Done
1800       // after call to limit_by_allocatable_memory because that
1801       // method might reduce the allocation size.
1802       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1803     }
1804 
1805     if (PrintGCDetails && Verbose) {
1806       // Cannot use gclog_or_tty yet.
1807       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1808     }
1809     FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1810   }
1811 
1812   // If the minimum or initial heap_size have not been set or requested to be set
1813   // ergonomically, set them accordingly.
1814   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1815     julong reasonable_minimum = (julong)(OldSize + NewSize);
1816 
1817     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1818 
1819     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1820 
1821     if (InitialHeapSize == 0) {
1822       julong reasonable_initial = phys_mem / InitialRAMFraction;
1823 
1824       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1825       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1826 
1827       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1828 
1829       if (PrintGCDetails && Verbose) {
1830         // Cannot use gclog_or_tty yet.
1831         tty->print_cr("  Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1832       }
1833       FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1834     }
1835     // If the minimum heap size has not been set (via -Xms),
1836     // synchronize with InitialHeapSize to avoid errors with the default value.
1837     if (min_heap_size() == 0) {
1838       set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1839       if (PrintGCDetails && Verbose) {
1840         // Cannot use gclog_or_tty yet.
1841         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1842       }
1843     }
1844   }
1845 }
1846 
1847   // Set up runtime image flags
1848 void Arguments::set_runtime_image_flags() {
1849 #ifdef _LP64
1850   // Memory map image file by default on 64 bit machines.
1851   if (FLAG_IS_DEFAULT(MemoryMapImage)) {
1852     FLAG_SET_ERGO(bool, MemoryMapImage, true);
1853   }
1854 #endif
1855 }
1856 
1857 // This must be called after ergonomics.
1858 void Arguments::set_bytecode_flags() {
1859   if (!RewriteBytecodes) {
1860     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1861   }
1862 }
1863 
1864 // Aggressive optimization flags  -XX:+AggressiveOpts
1865 void Arguments::set_aggressive_opts_flags() {
1866 #ifdef COMPILER2
1867   if (AggressiveUnboxing) {
1868     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1869       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1870     } else if (!EliminateAutoBox) {
1871       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1872       AggressiveUnboxing = false;
1873     }
1874     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1875       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1876     } else if (!DoEscapeAnalysis) {
1877       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1878       AggressiveUnboxing = false;
1879     }
1880   }
1881   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1882     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1883       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1884     }
1885     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1886       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1887     }
1888 
1889     // Feed the cache size setting into the JDK
1890     char buffer[1024];
1891     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1892     add_property(buffer);
1893   }
1894   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1895     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1896   }
1897 #endif
1898 
1899   if (AggressiveOpts) {
1900 // Sample flag setting code
1901 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1902 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1903 //    }
1904   }
1905 }
1906 
1907 //===========================================================================================================
1908 // Parsing of java.compiler property
1909 
1910 void Arguments::process_java_compiler_argument(char* arg) {
1911   // For backwards compatibility, Djava.compiler=NONE or ""
1912   // causes us to switch to -Xint mode UNLESS -Xdebug
1913   // is also specified.
1914   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1915     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1916   }
1917 }
1918 
1919 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1920   _sun_java_launcher = os::strdup_check_oom(launcher);
1921 }
1922 
1923 bool Arguments::created_by_java_launcher() {
1924   assert(_sun_java_launcher != NULL, "property must have value");
1925   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1926 }
1927 
1928 bool Arguments::sun_java_launcher_is_altjvm() {
1929   return _sun_java_launcher_is_altjvm;
1930 }
1931 
1932 //===========================================================================================================
1933 // Parsing of main arguments
1934 
1935 // check if do gclog rotation
1936 // +UseGCLogFileRotation is a must,
1937 // no gc log rotation when log file not supplied or
1938 // NumberOfGCLogFiles is 0
1939 void check_gclog_consistency() {
1940   if (UseGCLogFileRotation) {
1941     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1942       jio_fprintf(defaultStream::output_stream(),
1943                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1944                   "where num_of_file > 0\n"
1945                   "GC log rotation is turned off\n");
1946       UseGCLogFileRotation = false;
1947     }
1948   }
1949 
1950   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1951     if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
1952       jio_fprintf(defaultStream::output_stream(),
1953                 "GCLogFileSize changed to minimum 8K\n");
1954     }
1955   }
1956 }
1957 
1958 // This function is called for -Xloggc:<filename>, it can be used
1959 // to check if a given file name(or string) conforms to the following
1960 // specification:
1961 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1962 // %p and %t only allowed once. We only limit usage of filename not path
1963 bool is_filename_valid(const char *file_name) {
1964   const char* p = file_name;
1965   char file_sep = os::file_separator()[0];
1966   const char* cp;
1967   // skip prefix path
1968   for (cp = file_name; *cp != '\0'; cp++) {
1969     if (*cp == '/' || *cp == file_sep) {
1970       p = cp + 1;
1971     }
1972   }
1973 
1974   int count_p = 0;
1975   int count_t = 0;
1976   while (*p != '\0') {
1977     if ((*p >= '0' && *p <= '9') ||
1978         (*p >= 'A' && *p <= 'Z') ||
1979         (*p >= 'a' && *p <= 'z') ||
1980          *p == '-'               ||
1981          *p == '_'               ||
1982          *p == '.') {
1983        p++;
1984        continue;
1985     }
1986     if (*p == '%') {
1987       if(*(p + 1) == 'p') {
1988         p += 2;
1989         count_p ++;
1990         continue;
1991       }
1992       if (*(p + 1) == 't') {
1993         p += 2;
1994         count_t ++;
1995         continue;
1996       }
1997     }
1998     return false;
1999   }
2000   return count_p < 2 && count_t < 2;
2001 }
2002 
2003 // Check consistency of GC selection
2004 bool Arguments::check_gc_consistency() {
2005   check_gclog_consistency();
2006   // Ensure that the user has not selected conflicting sets
2007   // of collectors.
2008   uint i = 0;
2009   if (UseSerialGC)                       i++;
2010   if (UseConcMarkSweepGC)                i++;
2011   if (UseParallelGC || UseParallelOldGC) i++;
2012   if (UseG1GC)                           i++;
2013   if (i > 1) {
2014     jio_fprintf(defaultStream::error_stream(),
2015                 "Conflicting collector combinations in option list; "
2016                 "please refer to the release notes for the combinations "
2017                 "allowed\n");
2018     return false;
2019   }
2020 
2021   if (UseConcMarkSweepGC && !UseParNewGC) {
2022     jio_fprintf(defaultStream::error_stream(),
2023         "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2024     return false;
2025   }
2026 
2027   if (UseParNewGC && !UseConcMarkSweepGC) {
2028     jio_fprintf(defaultStream::error_stream(),
2029         "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2030     return false;
2031   }
2032 
2033   return true;
2034 }
2035 
2036 void Arguments::check_deprecated_gc_flags() {
2037   if (FLAG_IS_CMDLINE(UseParNewGC)) {
2038     warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2039   }
2040   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2041     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2042             "and will likely be removed in future release");
2043   }
2044   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2045     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2046         "Use MaxRAMFraction instead.");
2047   }
2048 }
2049 
2050 // Check the consistency of vm_init_args
2051 bool Arguments::check_vm_args_consistency() {
2052   // Method for adding checks for flag consistency.
2053   // The intent is to warn the user of all possible conflicts,
2054   // before returning an error.
2055   // Note: Needs platform-dependent factoring.
2056   bool status = true;
2057 
2058   if (TLABRefillWasteFraction == 0) {
2059     jio_fprintf(defaultStream::error_stream(),
2060                 "TLABRefillWasteFraction should be a denominator, "
2061                 "not " SIZE_FORMAT "\n",
2062                 TLABRefillWasteFraction);
2063     status = false;
2064   }
2065 
2066   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2067     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2068   }
2069 
2070   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2071     // Settings to encourage splitting.
2072     if (!FLAG_IS_CMDLINE(NewRatio)) {
2073       if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2074         status = false;
2075       }
2076     }
2077     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2078       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2079         status = false;
2080       }
2081     }
2082   }
2083 
2084   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2085     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2086   }
2087 
2088   if (GCTimeLimit == 100) {
2089     // Turn off gc-overhead-limit-exceeded checks
2090     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2091   }
2092 
2093   status = status && check_gc_consistency();
2094 
2095   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2096   // insists that we hold the requisite locks so that the iteration is
2097   // MT-safe. For the verification at start-up and shut-down, we don't
2098   // yet have a good way of acquiring and releasing these locks,
2099   // which are not visible at the CollectedHeap level. We want to
2100   // be able to acquire these locks and then do the iteration rather
2101   // than just disable the lock verification. This will be fixed under
2102   // bug 4788986.
2103   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2104     if (VerifyDuringStartup) {
2105       warning("Heap verification at start-up disabled "
2106               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2107       VerifyDuringStartup = false; // Disable verification at start-up
2108     }
2109 
2110     if (VerifyBeforeExit) {
2111       warning("Heap verification at shutdown disabled "
2112               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2113       VerifyBeforeExit = false; // Disable verification at shutdown
2114     }
2115   }
2116 
2117   // Note: only executed in non-PRODUCT mode
2118   if (!UseAsyncConcMarkSweepGC &&
2119       (ExplicitGCInvokesConcurrent ||
2120        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2121     jio_fprintf(defaultStream::error_stream(),
2122                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2123                 " with -UseAsyncConcMarkSweepGC");
2124     status = false;
2125   }
2126 
2127   if (PrintNMTStatistics) {
2128 #if INCLUDE_NMT
2129     if (MemTracker::tracking_level() == NMT_off) {
2130 #endif // INCLUDE_NMT
2131       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2132       PrintNMTStatistics = false;
2133 #if INCLUDE_NMT
2134     }
2135 #endif
2136   }
2137 
2138   // Check lower bounds of the code cache
2139   // Template Interpreter code is approximately 3X larger in debug builds.
2140   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2141   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2142     jio_fprintf(defaultStream::error_stream(),
2143                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2144                 os::vm_page_size()/K);
2145     status = false;
2146   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2147     jio_fprintf(defaultStream::error_stream(),
2148                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2149                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2150     status = false;
2151   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2152     jio_fprintf(defaultStream::error_stream(),
2153                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2154                 min_code_cache_size/K);
2155     status = false;
2156   } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2157     // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2158     jio_fprintf(defaultStream::error_stream(),
2159                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2160                 CODE_CACHE_SIZE_LIMIT/M);
2161     status = false;
2162   } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2163     jio_fprintf(defaultStream::error_stream(),
2164                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2165                 min_code_cache_size/K);
2166     status = false;
2167   } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2168              && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2169     jio_fprintf(defaultStream::error_stream(),
2170                 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2171                 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2172                 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2173     status = false;
2174   }
2175 
2176   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2177     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2178   }
2179 
2180   return status;
2181 }
2182 
2183 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2184   const char* option_type) {
2185   if (ignore) return false;
2186 
2187   const char* spacer = " ";
2188   if (option_type == NULL) {
2189     option_type = ++spacer; // Set both to the empty string.
2190   }
2191 
2192   if (os::obsolete_option(option)) {
2193     jio_fprintf(defaultStream::error_stream(),
2194                 "Obsolete %s%soption: %s\n", option_type, spacer,
2195       option->optionString);
2196     return false;
2197   } else {
2198     jio_fprintf(defaultStream::error_stream(),
2199                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2200       option->optionString);
2201     return true;
2202   }
2203 }
2204 
2205 static const char* user_assertion_options[] = {
2206   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2207 };
2208 
2209 static const char* system_assertion_options[] = {
2210   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2211 };
2212 
2213 bool Arguments::parse_uintx(const char* value,
2214                             uintx* uintx_arg,
2215                             uintx min_size) {
2216 
2217   // Check the sign first since atomull() parses only unsigned values.
2218   bool value_is_positive = !(*value == '-');
2219 
2220   if (value_is_positive) {
2221     julong n;
2222     bool good_return = atomull(value, &n);
2223     if (good_return) {
2224       bool above_minimum = n >= min_size;
2225       bool value_is_too_large = n > max_uintx;
2226 
2227       if (above_minimum && !value_is_too_large) {
2228         *uintx_arg = n;
2229         return true;
2230       }
2231     }
2232   }
2233   return false;
2234 }
2235 
2236 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2237                                                   julong* long_arg,
2238                                                   julong min_size) {
2239   if (!atomull(s, long_arg)) return arg_unreadable;
2240   return check_memory_size(*long_arg, min_size);
2241 }
2242 
2243 // Parse JavaVMInitArgs structure
2244 
2245 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2246                                    const JavaVMInitArgs *java_options_args,
2247                                    const JavaVMInitArgs *cmd_line_args) {
2248   // For components of the system classpath.
2249   SysClassPath scp(Arguments::get_sysclasspath());
2250   bool scp_assembly_required = false;
2251 
2252   // Save default settings for some mode flags
2253   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2254   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2255   Arguments::_ClipInlining             = ClipInlining;
2256   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2257   if (TieredCompilation) {
2258     Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2259     Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2260   }
2261 
2262   // Setup flags for mixed which is the default
2263   set_mode_flags(_mixed);
2264 
2265   // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2266   // variable (if present).
2267   jint result = parse_each_vm_init_arg(
2268       java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2269   if (result != JNI_OK) {
2270     return result;
2271   }
2272 
2273   // Parse args structure generated from the command line flags.
2274   result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2275                                   Flag::COMMAND_LINE);
2276   if (result != JNI_OK) {
2277     return result;
2278   }
2279 
2280   // Parse args structure generated from the _JAVA_OPTIONS environment
2281   // variable (if present) (mimics classic VM)
2282   result = parse_each_vm_init_arg(
2283       java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2284   if (result != JNI_OK) {
2285     return result;
2286   }
2287 
2288   // Do final processing now that all arguments have been parsed
2289   result = finalize_vm_init_args(&scp, scp_assembly_required);
2290   if (result != JNI_OK) {
2291     return result;
2292   }
2293 
2294   return JNI_OK;
2295 }
2296 
2297 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2298 // represents a valid JDWP agent.  is_path==true denotes that we
2299 // are dealing with -agentpath (case where name is a path), otherwise with
2300 // -agentlib
2301 bool valid_jdwp_agent(char *name, bool is_path) {
2302   char *_name;
2303   const char *_jdwp = "jdwp";
2304   size_t _len_jdwp, _len_prefix;
2305 
2306   if (is_path) {
2307     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2308       return false;
2309     }
2310 
2311     _name++;  // skip past last path separator
2312     _len_prefix = strlen(JNI_LIB_PREFIX);
2313 
2314     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2315       return false;
2316     }
2317 
2318     _name += _len_prefix;
2319     _len_jdwp = strlen(_jdwp);
2320 
2321     if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2322       _name += _len_jdwp;
2323     }
2324     else {
2325       return false;
2326     }
2327 
2328     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2329       return false;
2330     }
2331 
2332     return true;
2333   }
2334 
2335   if (strcmp(name, _jdwp) == 0) {
2336     return true;
2337   }
2338 
2339   return false;
2340 }
2341 
2342 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2343                                        SysClassPath* scp_p,
2344                                        bool* scp_assembly_required_p,
2345                                        Flag::Flags origin) {
2346   // Remaining part of option string
2347   const char* tail;
2348 
2349   // iterate over arguments
2350   for (int index = 0; index < args->nOptions; index++) {
2351     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2352 
2353     const JavaVMOption* option = args->options + index;
2354 
2355     if (!match_option(option, "-Djava.class.path", &tail) &&
2356         !match_option(option, "-Dsun.java.command", &tail) &&
2357         !match_option(option, "-Dsun.java.launcher", &tail)) {
2358 
2359         // add all jvm options to the jvm_args string. This string
2360         // is used later to set the java.vm.args PerfData string constant.
2361         // the -Djava.class.path and the -Dsun.java.command options are
2362         // omitted from jvm_args string as each have their own PerfData
2363         // string constant object.
2364         build_jvm_args(option->optionString);
2365     }
2366 
2367     // -verbose:[class/gc/jni]
2368     if (match_option(option, "-verbose", &tail)) {
2369       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2370         if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2371           return JNI_EINVAL;
2372         }
2373         if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2374           return JNI_EINVAL;
2375         }
2376       } else if (!strcmp(tail, ":gc")) {
2377         if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2378           return JNI_EINVAL;
2379         }
2380       } else if (!strcmp(tail, ":jni")) {
2381         if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2382           return JNI_EINVAL;
2383         }
2384       }
2385     // -da / -ea / -disableassertions / -enableassertions
2386     // These accept an optional class/package name separated by a colon, e.g.,
2387     // -da:java.lang.Thread.
2388     } else if (match_option(option, user_assertion_options, &tail, true)) {
2389       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2390       if (*tail == '\0') {
2391         JavaAssertions::setUserClassDefault(enable);
2392       } else {
2393         assert(*tail == ':', "bogus match by match_option()");
2394         JavaAssertions::addOption(tail + 1, enable);
2395       }
2396     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2397     } else if (match_option(option, system_assertion_options, &tail, false)) {
2398       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2399       JavaAssertions::setSystemClassDefault(enable);
2400     // -bootclasspath:
2401     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2402       scp_p->reset_path(tail);
2403       *scp_assembly_required_p = true;
2404     // -bootclasspath/a:
2405     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2406       scp_p->add_suffix(tail);
2407       *scp_assembly_required_p = true;
2408     // -bootclasspath/p:
2409     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2410       scp_p->add_prefix(tail);
2411       *scp_assembly_required_p = true;
2412     // -Xrun
2413     } else if (match_option(option, "-Xrun", &tail)) {
2414       if (tail != NULL) {
2415         const char* pos = strchr(tail, ':');
2416         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2417         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2418         name[len] = '\0';
2419 
2420         char *options = NULL;
2421         if(pos != NULL) {
2422           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2423           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2424         }
2425 #if !INCLUDE_JVMTI
2426         if (strcmp(name, "jdwp") == 0) {
2427           jio_fprintf(defaultStream::error_stream(),
2428             "Debugging agents are not supported in this VM\n");
2429           return JNI_ERR;
2430         }
2431 #endif // !INCLUDE_JVMTI
2432         add_init_library(name, options);
2433       }
2434     // -agentlib and -agentpath
2435     } else if (match_option(option, "-agentlib:", &tail) ||
2436           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2437       if(tail != NULL) {
2438         const char* pos = strchr(tail, '=');
2439         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2440         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2441         name[len] = '\0';
2442 
2443         char *options = NULL;
2444         if(pos != NULL) {
2445           options = os::strdup_check_oom(pos + 1, mtInternal);
2446         }
2447 #if !INCLUDE_JVMTI
2448         if (valid_jdwp_agent(name, is_absolute_path)) {
2449           jio_fprintf(defaultStream::error_stream(),
2450             "Debugging agents are not supported in this VM\n");
2451           return JNI_ERR;
2452         }
2453 #endif // !INCLUDE_JVMTI
2454         add_init_agent(name, options, is_absolute_path);
2455       }
2456     // -javaagent
2457     } else if (match_option(option, "-javaagent:", &tail)) {
2458 #if !INCLUDE_JVMTI
2459       jio_fprintf(defaultStream::error_stream(),
2460         "Instrumentation agents are not supported in this VM\n");
2461       return JNI_ERR;
2462 #else
2463       if(tail != NULL) {
2464         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2465         add_init_agent("instrument", options, false);
2466       }
2467 #endif // !INCLUDE_JVMTI
2468     // -Xnoclassgc
2469     } else if (match_option(option, "-Xnoclassgc")) {
2470       if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2471         return JNI_EINVAL;
2472       }
2473     // -Xconcgc
2474     } else if (match_option(option, "-Xconcgc")) {
2475       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2476         return JNI_EINVAL;
2477       }
2478     // -Xnoconcgc
2479     } else if (match_option(option, "-Xnoconcgc")) {
2480       if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2481         return JNI_EINVAL;
2482       }
2483     // -Xbatch
2484     } else if (match_option(option, "-Xbatch")) {
2485       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2486         return JNI_EINVAL;
2487       }
2488     // -Xmn for compatibility with other JVM vendors
2489     } else if (match_option(option, "-Xmn", &tail)) {
2490       julong long_initial_young_size = 0;
2491       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2492       if (errcode != arg_in_range) {
2493         jio_fprintf(defaultStream::error_stream(),
2494                     "Invalid initial young generation size: %s\n", option->optionString);
2495         describe_range_error(errcode);
2496         return JNI_EINVAL;
2497       }
2498       if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2499         return JNI_EINVAL;
2500       }
2501       if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2502         return JNI_EINVAL;
2503       }
2504     // -Xms
2505     } else if (match_option(option, "-Xms", &tail)) {
2506       julong long_initial_heap_size = 0;
2507       // an initial heap size of 0 means automatically determine
2508       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2509       if (errcode != arg_in_range) {
2510         jio_fprintf(defaultStream::error_stream(),
2511                     "Invalid initial heap size: %s\n", option->optionString);
2512         describe_range_error(errcode);
2513         return JNI_EINVAL;
2514       }
2515       set_min_heap_size((size_t)long_initial_heap_size);
2516       // Currently the minimum size and the initial heap sizes are the same.
2517       // Can be overridden with -XX:InitialHeapSize.
2518       if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2519         return JNI_EINVAL;
2520       }
2521     // -Xmx
2522     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2523       julong long_max_heap_size = 0;
2524       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2525       if (errcode != arg_in_range) {
2526         jio_fprintf(defaultStream::error_stream(),
2527                     "Invalid maximum heap size: %s\n", option->optionString);
2528         describe_range_error(errcode);
2529         return JNI_EINVAL;
2530       }
2531       if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2532         return JNI_EINVAL;
2533       }
2534     // Xmaxf
2535     } else if (match_option(option, "-Xmaxf", &tail)) {
2536       char* err;
2537       int maxf = (int)(strtod(tail, &err) * 100);
2538       if (*err != '\0' || *tail == '\0') {
2539         jio_fprintf(defaultStream::error_stream(),
2540                     "Bad max heap free percentage size: %s\n",
2541                     option->optionString);
2542         return JNI_EINVAL;
2543       } else {
2544         if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2545             return JNI_EINVAL;
2546         }
2547       }
2548     // Xminf
2549     } else if (match_option(option, "-Xminf", &tail)) {
2550       char* err;
2551       int minf = (int)(strtod(tail, &err) * 100);
2552       if (*err != '\0' || *tail == '\0') {
2553         jio_fprintf(defaultStream::error_stream(),
2554                     "Bad min heap free percentage size: %s\n",
2555                     option->optionString);
2556         return JNI_EINVAL;
2557       } else {
2558         if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2559           return JNI_EINVAL;
2560         }
2561       }
2562     // -Xss
2563     } else if (match_option(option, "-Xss", &tail)) {
2564       julong long_ThreadStackSize = 0;
2565       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2566       if (errcode != arg_in_range) {
2567         jio_fprintf(defaultStream::error_stream(),
2568                     "Invalid thread stack size: %s\n", option->optionString);
2569         describe_range_error(errcode);
2570         return JNI_EINVAL;
2571       }
2572       // Internally track ThreadStackSize in units of 1024 bytes.
2573       if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2574                        round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2575         return JNI_EINVAL;
2576       }
2577     // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2578     } else if (match_option(option, "-Xoss", &tail) ||
2579                match_option(option, "-Xsqnopause") ||
2580                match_option(option, "-Xoptimize") ||
2581                match_option(option, "-Xboundthreads")) {
2582       // All these options are deprecated in JDK 9 and will be removed in a future release
2583       char version[256];
2584       JDK_Version::jdk(9).to_string(version, sizeof(version));
2585       warning("ignoring option %s; support was removed in %s", option->optionString, version);
2586     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2587       julong long_CodeCacheExpansionSize = 0;
2588       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2589       if (errcode != arg_in_range) {
2590         jio_fprintf(defaultStream::error_stream(),
2591                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2592                    os::vm_page_size()/K);
2593         return JNI_EINVAL;
2594       }
2595       if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2596         return JNI_EINVAL;
2597       }
2598     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2599                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2600       julong long_ReservedCodeCacheSize = 0;
2601 
2602       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2603       if (errcode != arg_in_range) {
2604         jio_fprintf(defaultStream::error_stream(),
2605                     "Invalid maximum code cache size: %s.\n", option->optionString);
2606         return JNI_EINVAL;
2607       }
2608       if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2609         return JNI_EINVAL;
2610       }
2611       // -XX:NonNMethodCodeHeapSize=
2612     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2613       julong long_NonNMethodCodeHeapSize = 0;
2614 
2615       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2616       if (errcode != arg_in_range) {
2617         jio_fprintf(defaultStream::error_stream(),
2618                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2619         return JNI_EINVAL;
2620       }
2621       if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2622         return JNI_EINVAL;
2623       }
2624       // -XX:ProfiledCodeHeapSize=
2625     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2626       julong long_ProfiledCodeHeapSize = 0;
2627 
2628       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2629       if (errcode != arg_in_range) {
2630         jio_fprintf(defaultStream::error_stream(),
2631                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2632         return JNI_EINVAL;
2633       }
2634       if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2635         return JNI_EINVAL;
2636       }
2637       // -XX:NonProfiledCodeHeapSizee=
2638     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2639       julong long_NonProfiledCodeHeapSize = 0;
2640 
2641       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2642       if (errcode != arg_in_range) {
2643         jio_fprintf(defaultStream::error_stream(),
2644                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2645         return JNI_EINVAL;
2646       }
2647       if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2648         return JNI_EINVAL;
2649       }
2650     // -green
2651     } else if (match_option(option, "-green")) {
2652       jio_fprintf(defaultStream::error_stream(),
2653                   "Green threads support not available\n");
2654           return JNI_EINVAL;
2655     // -native
2656     } else if (match_option(option, "-native")) {
2657           // HotSpot always uses native threads, ignore silently for compatibility
2658     // -Xrs
2659     } else if (match_option(option, "-Xrs")) {
2660           // Classic/EVM option, new functionality
2661       if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2662         return JNI_EINVAL;
2663       }
2664     } else if (match_option(option, "-Xusealtsigs")) {
2665           // change default internal VM signals used - lower case for back compat
2666       if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
2667         return JNI_EINVAL;
2668       }
2669     // -Xprof
2670     } else if (match_option(option, "-Xprof")) {
2671 #if INCLUDE_FPROF
2672       _has_profile = true;
2673 #else // INCLUDE_FPROF
2674       jio_fprintf(defaultStream::error_stream(),
2675         "Flat profiling is not supported in this VM.\n");
2676       return JNI_ERR;
2677 #endif // INCLUDE_FPROF
2678     // -Xconcurrentio
2679     } else if (match_option(option, "-Xconcurrentio")) {
2680       if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2681         return JNI_EINVAL;
2682       }
2683       if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2684         return JNI_EINVAL;
2685       }
2686       if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2687         return JNI_EINVAL;
2688       }
2689       if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2690         return JNI_EINVAL;
2691       }
2692       if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) {  // 20Kb per thread added to new generation
2693         return JNI_EINVAL;
2694       }
2695 
2696       // -Xinternalversion
2697     } else if (match_option(option, "-Xinternalversion")) {
2698       jio_fprintf(defaultStream::output_stream(), "%s\n",
2699                   VM_Version::internal_vm_info_string());
2700       vm_exit(0);
2701 #ifndef PRODUCT
2702     // -Xprintflags
2703     } else if (match_option(option, "-Xprintflags")) {
2704       CommandLineFlags::printFlags(tty, false);
2705       vm_exit(0);
2706 #endif
2707     // -D
2708     } else if (match_option(option, "-D", &tail)) {
2709       const char* value;
2710       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2711             *value!= '\0' && strcmp(value, "\"\"") != 0) {
2712         // abort if -Djava.endorsed.dirs is set
2713         jio_fprintf(defaultStream::output_stream(),
2714           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2715           "in modular form will be supported via the concept of upgradeable modules.\n", value);
2716         return JNI_EINVAL;
2717       }
2718       if (match_option(option, "-Djava.ext.dirs=", &value) &&
2719             *value != '\0' && strcmp(value, "\"\"") != 0) {
2720         // abort if -Djava.ext.dirs is set
2721         jio_fprintf(defaultStream::output_stream(),
2722           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
2723         return JNI_EINVAL;
2724       }
2725 
2726       if (!add_property(tail)) {
2727         return JNI_ENOMEM;
2728       }
2729       // Out of the box management support
2730       if (match_option(option, "-Dcom.sun.management", &tail)) {
2731 #if INCLUDE_MANAGEMENT
2732         if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2733           return JNI_EINVAL;
2734         }
2735 #else
2736         jio_fprintf(defaultStream::output_stream(),
2737           "-Dcom.sun.management is not supported in this VM.\n");
2738         return JNI_ERR;
2739 #endif
2740       }
2741     // -Xint
2742     } else if (match_option(option, "-Xint")) {
2743           set_mode_flags(_int);
2744     // -Xmixed
2745     } else if (match_option(option, "-Xmixed")) {
2746           set_mode_flags(_mixed);
2747     // -Xcomp
2748     } else if (match_option(option, "-Xcomp")) {
2749       // for testing the compiler; turn off all flags that inhibit compilation
2750           set_mode_flags(_comp);
2751     // -Xshare:dump
2752     } else if (match_option(option, "-Xshare:dump")) {
2753       if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2754         return JNI_EINVAL;
2755       }
2756       set_mode_flags(_int);     // Prevent compilation, which creates objects
2757     // -Xshare:on
2758     } else if (match_option(option, "-Xshare:on")) {
2759       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2760         return JNI_EINVAL;
2761       }
2762       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2763         return JNI_EINVAL;
2764       }
2765     // -Xshare:auto
2766     } else if (match_option(option, "-Xshare:auto")) {
2767       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2768         return JNI_EINVAL;
2769       }
2770       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2771         return JNI_EINVAL;
2772       }
2773     // -Xshare:off
2774     } else if (match_option(option, "-Xshare:off")) {
2775       if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2776         return JNI_EINVAL;
2777       }
2778       if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2779         return JNI_EINVAL;
2780       }
2781     // -Xverify
2782     } else if (match_option(option, "-Xverify", &tail)) {
2783       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2784         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2785           return JNI_EINVAL;
2786         }
2787         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2788           return JNI_EINVAL;
2789         }
2790       } else if (strcmp(tail, ":remote") == 0) {
2791         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2792           return JNI_EINVAL;
2793         }
2794         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2795           return JNI_EINVAL;
2796         }
2797       } else if (strcmp(tail, ":none") == 0) {
2798         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2799           return JNI_EINVAL;
2800         }
2801         if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2802           return JNI_EINVAL;
2803         }
2804       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2805         return JNI_EINVAL;
2806       }
2807     // -Xdebug
2808     } else if (match_option(option, "-Xdebug")) {
2809       // note this flag has been used, then ignore
2810       set_xdebug_mode(true);
2811     // -Xnoagent
2812     } else if (match_option(option, "-Xnoagent")) {
2813       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2814     } else if (match_option(option, "-Xloggc:", &tail)) {
2815       // Redirect GC output to the file. -Xloggc:<filename>
2816       // ostream_init_log(), when called will use this filename
2817       // to initialize a fileStream.
2818       _gc_log_filename = os::strdup_check_oom(tail);
2819      if (!is_filename_valid(_gc_log_filename)) {
2820        jio_fprintf(defaultStream::output_stream(),
2821                   "Invalid file name for use with -Xloggc: Filename can only contain the "
2822                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2823                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
2824         return JNI_EINVAL;
2825       }
2826       if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2827         return JNI_EINVAL;
2828       }
2829       if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
2830         return JNI_EINVAL;
2831       }
2832     // JNI hooks
2833     } else if (match_option(option, "-Xcheck", &tail)) {
2834       if (!strcmp(tail, ":jni")) {
2835 #if !INCLUDE_JNI_CHECK
2836         warning("JNI CHECKING is not supported in this VM");
2837 #else
2838         CheckJNICalls = true;
2839 #endif // INCLUDE_JNI_CHECK
2840       } else if (is_bad_option(option, args->ignoreUnrecognized,
2841                                      "check")) {
2842         return JNI_EINVAL;
2843       }
2844     } else if (match_option(option, "vfprintf")) {
2845       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2846     } else if (match_option(option, "exit")) {
2847       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2848     } else if (match_option(option, "abort")) {
2849       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2850     // -XX:+AggressiveHeap
2851     } else if (match_option(option, "-XX:+AggressiveHeap")) {
2852 
2853       // This option inspects the machine and attempts to set various
2854       // parameters to be optimal for long-running, memory allocation
2855       // intensive jobs.  It is intended for machines with large
2856       // amounts of cpu and memory.
2857 
2858       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2859       // VM, but we may not be able to represent the total physical memory
2860       // available (like having 8gb of memory on a box but using a 32bit VM).
2861       // Thus, we need to make sure we're using a julong for intermediate
2862       // calculations.
2863       julong initHeapSize;
2864       julong total_memory = os::physical_memory();
2865 
2866       if (total_memory < (julong)256*M) {
2867         jio_fprintf(defaultStream::error_stream(),
2868                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2869         vm_exit(1);
2870       }
2871 
2872       // The heap size is half of available memory, or (at most)
2873       // all of possible memory less 160mb (leaving room for the OS
2874       // when using ISM).  This is the maximum; because adaptive sizing
2875       // is turned on below, the actual space used may be smaller.
2876 
2877       initHeapSize = MIN2(total_memory / (julong)2,
2878                           total_memory - (julong)160*M);
2879 
2880       initHeapSize = limit_by_allocatable_memory(initHeapSize);
2881 
2882       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2883          if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2884            return JNI_EINVAL;
2885          }
2886          if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2887            return JNI_EINVAL;
2888          }
2889          // Currently the minimum size and the initial heap sizes are the same.
2890          set_min_heap_size(initHeapSize);
2891       }
2892       if (FLAG_IS_DEFAULT(NewSize)) {
2893          // Make the young generation 3/8ths of the total heap.
2894          if (FLAG_SET_CMDLINE(size_t, NewSize,
2895                                 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) {
2896            return JNI_EINVAL;
2897          }
2898          if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2899            return JNI_EINVAL;
2900          }
2901       }
2902 
2903 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
2904       FLAG_SET_DEFAULT(UseLargePages, true);
2905 #endif
2906 
2907       // Increase some data structure sizes for efficiency
2908       if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2909         return JNI_EINVAL;
2910       }
2911       if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2912         return JNI_EINVAL;
2913       }
2914       if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) {
2915         return JNI_EINVAL;
2916       }
2917 
2918       // See the OldPLABSize comment below, but replace 'after promotion'
2919       // with 'after copying'.  YoungPLABSize is the size of the survivor
2920       // space per-gc-thread buffers.  The default is 4kw.
2921       if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) {      // Note: this is in words
2922         return JNI_EINVAL;
2923       }
2924 
2925       // OldPLABSize is the size of the buffers in the old gen that
2926       // UseParallelGC uses to promote live data that doesn't fit in the
2927       // survivor spaces.  At any given time, there's one for each gc thread.
2928       // The default size is 1kw. These buffers are rarely used, since the
2929       // survivor spaces are usually big enough.  For specjbb, however, there
2930       // are occasions when there's lots of live data in the young gen
2931       // and we end up promoting some of it.  We don't have a definite
2932       // explanation for why bumping OldPLABSize helps, but the theory
2933       // is that a bigger PLAB results in retaining something like the
2934       // original allocation order after promotion, which improves mutator
2935       // locality.  A minor effect may be that larger PLABs reduce the
2936       // number of PLAB allocation events during gc.  The value of 8kw
2937       // was arrived at by experimenting with specjbb.
2938       if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) {  // Note: this is in words
2939         return JNI_EINVAL;
2940       }
2941 
2942       // Enable parallel GC and adaptive generation sizing
2943       if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2944         return JNI_EINVAL;
2945       }
2946       FLAG_SET_DEFAULT(ParallelGCThreads,
2947                        Abstract_VM_Version::parallel_worker_threads());
2948 
2949       // Encourage steady state memory management
2950       if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2951         return JNI_EINVAL;
2952       }
2953 
2954       // This appears to improve mutator locality
2955       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2956         return JNI_EINVAL;
2957       }
2958 
2959       // Get around early Solaris scheduling bug
2960       // (affinity vs other jobs on system)
2961       // but disallow DR and offlining (5008695).
2962       if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2963         return JNI_EINVAL;
2964       }
2965 
2966     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2967     // and the last option wins.
2968     } else if (match_option(option, "-XX:+NeverTenure")) {
2969       if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
2970         return JNI_EINVAL;
2971       }
2972       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2973         return JNI_EINVAL;
2974       }
2975       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
2976         return JNI_EINVAL;
2977       }
2978     } else if (match_option(option, "-XX:+AlwaysTenure")) {
2979       if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2980         return JNI_EINVAL;
2981       }
2982       if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2983         return JNI_EINVAL;
2984       }
2985       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
2986         return JNI_EINVAL;
2987       }
2988     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2989       uintx max_tenuring_thresh = 0;
2990       if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2991         jio_fprintf(defaultStream::error_stream(),
2992                     "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2993         return JNI_EINVAL;
2994       }
2995 
2996       if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
2997         return JNI_EINVAL;
2998       }
2999 
3000       if (MaxTenuringThreshold == 0) {
3001         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3002           return JNI_EINVAL;
3003         }
3004         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3005           return JNI_EINVAL;
3006         }
3007       } else {
3008         if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3009           return JNI_EINVAL;
3010         }
3011         if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3012           return JNI_EINVAL;
3013         }
3014       }
3015     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3016       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3017         return JNI_EINVAL;
3018       }
3019       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3020         return JNI_EINVAL;
3021       }
3022     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3023       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3024         return JNI_EINVAL;
3025       }
3026       if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3027         return JNI_EINVAL;
3028       }
3029     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3030 #if defined(DTRACE_ENABLED)
3031       if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3032         return JNI_EINVAL;
3033       }
3034       if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3035         return JNI_EINVAL;
3036       }
3037       if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3038         return JNI_EINVAL;
3039       }
3040       if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3041         return JNI_EINVAL;
3042       }
3043 #else // defined(DTRACE_ENABLED)
3044       jio_fprintf(defaultStream::error_stream(),
3045                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3046       return JNI_EINVAL;
3047 #endif // defined(DTRACE_ENABLED)
3048 #ifdef ASSERT
3049     } else if (match_option(option, "-XX:+FullGCALot")) {
3050       if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3051         return JNI_EINVAL;
3052       }
3053       // disable scavenge before parallel mark-compact
3054       if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3055         return JNI_EINVAL;
3056       }
3057 #endif
3058     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3059                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3060       julong stack_size = 0;
3061       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3062       if (errcode != arg_in_range) {
3063         jio_fprintf(defaultStream::error_stream(),
3064                     "Invalid mark stack size: %s\n", option->optionString);
3065         describe_range_error(errcode);
3066         return JNI_EINVAL;
3067       }
3068       jio_fprintf(defaultStream::error_stream(),
3069         "Please use -XX:MarkStackSize in place of "
3070         "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3071       if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) {
3072         return JNI_EINVAL;
3073       }
3074     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3075       julong max_stack_size = 0;
3076       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3077       if (errcode != arg_in_range) {
3078         jio_fprintf(defaultStream::error_stream(),
3079                     "Invalid maximum mark stack size: %s\n",
3080                     option->optionString);
3081         describe_range_error(errcode);
3082         return JNI_EINVAL;
3083       }
3084       jio_fprintf(defaultStream::error_stream(),
3085          "Please use -XX:MarkStackSizeMax in place of "
3086          "-XX:CMSMarkStackSizeMax in the future\n");
3087       if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) {
3088         return JNI_EINVAL;
3089       }
3090     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3091                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3092       uintx conc_threads = 0;
3093       if (!parse_uintx(tail, &conc_threads, 1)) {
3094         jio_fprintf(defaultStream::error_stream(),
3095                     "Invalid concurrent threads: %s\n", option->optionString);
3096         return JNI_EINVAL;
3097       }
3098       jio_fprintf(defaultStream::error_stream(),
3099         "Please use -XX:ConcGCThreads in place of "
3100         "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3101       if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) {
3102         return JNI_EINVAL;
3103       }
3104     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3105       julong max_direct_memory_size = 0;
3106       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3107       if (errcode != arg_in_range) {
3108         jio_fprintf(defaultStream::error_stream(),
3109                     "Invalid maximum direct memory size: %s\n",
3110                     option->optionString);
3111         describe_range_error(errcode);
3112         return JNI_EINVAL;
3113       }
3114       if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3115         return JNI_EINVAL;
3116       }
3117 #if !INCLUDE_MANAGEMENT
3118     } else if (match_option(option, "-XX:+ManagementServer")) {
3119         jio_fprintf(defaultStream::error_stream(),
3120           "ManagementServer is not supported in this VM.\n");
3121         return JNI_ERR;
3122 #endif // INCLUDE_MANAGEMENT
3123     // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3124     } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3125       if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) {
3126         return JNI_EINVAL;
3127       }
3128       jio_fprintf(defaultStream::output_stream(),
3129           "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3130     } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3131       if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) {
3132         return JNI_EINVAL;
3133       }
3134       jio_fprintf(defaultStream::output_stream(),
3135           "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3136     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3137       // Skip -XX:Flags= since that case has already been handled
3138       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3139         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3140           return JNI_EINVAL;
3141         }
3142       }
3143     // Unknown option
3144     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3145       return JNI_ERR;
3146     }
3147   }
3148 
3149   // PrintSharedArchiveAndExit will turn on
3150   //   -Xshare:on
3151   //   -XX:+TraceClassPaths
3152   if (PrintSharedArchiveAndExit) {
3153     if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3154       return JNI_EINVAL;
3155     }
3156     if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3157       return JNI_EINVAL;
3158     }
3159     if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3160       return JNI_EINVAL;
3161     }
3162   }
3163 
3164   // Change the default value for flags  which have different default values
3165   // when working with older JDKs.
3166 #ifdef LINUX
3167  if (JDK_Version::current().compare_major(6) <= 0 &&
3168       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3169     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3170   }
3171 #endif // LINUX
3172   fix_appclasspath();
3173   return JNI_OK;
3174 }
3175 
3176 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3177 //
3178 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3179 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3180 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3181 // path is treated as the current directory.
3182 //
3183 // This causes problems with CDS, which requires that all directories specified in the classpath
3184 // must be empty. In most cases, applications do NOT want to load classes from the current
3185 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3186 // scripts compatible with CDS.
3187 void Arguments::fix_appclasspath() {
3188   if (IgnoreEmptyClassPaths) {
3189     const char separator = *os::path_separator();
3190     const char* src = _java_class_path->value();
3191 
3192     // skip over all the leading empty paths
3193     while (*src == separator) {
3194       src ++;
3195     }
3196 
3197     char* copy = os::strdup_check_oom(src, mtInternal);
3198 
3199     // trim all trailing empty paths
3200     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3201       *tail = '\0';
3202     }
3203 
3204     char from[3] = {separator, separator, '\0'};
3205     char to  [2] = {separator, '\0'};
3206     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3207       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3208       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3209     }
3210 
3211     _java_class_path->set_value(copy);
3212     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3213   }
3214 
3215   if (!PrintSharedArchiveAndExit) {
3216     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3217   }
3218 }
3219 
3220 static bool has_jar_files(const char* directory) {
3221   DIR* dir = os::opendir(directory);
3222   if (dir == NULL) return false;
3223 
3224   struct dirent *entry;
3225   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3226   bool hasJarFile = false;
3227   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3228     const char* name = entry->d_name;
3229     const char* ext = name + strlen(name) - 4;
3230     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3231   }
3232   FREE_C_HEAP_ARRAY(char, dbuf);
3233   os::closedir(dir);
3234   return hasJarFile ;
3235 }
3236 
3237 static int check_non_empty_dirs(const char* path) {
3238   const char separator = *os::path_separator();
3239   const char* const end = path + strlen(path);
3240   int nonEmptyDirs = 0;
3241   while (path < end) {
3242     const char* tmp_end = strchr(path, separator);
3243     if (tmp_end == NULL) {
3244       if (has_jar_files(path)) {
3245         nonEmptyDirs++;
3246         jio_fprintf(defaultStream::output_stream(),
3247           "Non-empty directory: %s\n", path);
3248       }
3249       path = end;
3250     } else {
3251       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3252       memcpy(dirpath, path, tmp_end - path);
3253       dirpath[tmp_end - path] = '\0';
3254       if (has_jar_files(dirpath)) {
3255         nonEmptyDirs++;
3256         jio_fprintf(defaultStream::output_stream(),
3257           "Non-empty directory: %s\n", dirpath);
3258       }
3259       FREE_C_HEAP_ARRAY(char, dirpath);
3260       path = tmp_end + 1;
3261     }
3262   }
3263   return nonEmptyDirs;
3264 }
3265 
3266 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3267   // check if the default lib/endorsed directory exists; if so, error
3268   char path[JVM_MAXPATHLEN];
3269   const char* fileSep = os::file_separator();
3270   sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3271 
3272   if (CheckEndorsedAndExtDirs) {
3273     int nonEmptyDirs = 0;
3274     // check endorsed directory
3275     nonEmptyDirs += check_non_empty_dirs(path);
3276     // check the extension directories
3277     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3278     if (nonEmptyDirs > 0) {
3279       return JNI_ERR;
3280     }
3281   }
3282 
3283   DIR* dir = os::opendir(path);
3284   if (dir != NULL) {
3285     jio_fprintf(defaultStream::output_stream(),
3286       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3287       "in modular form will be supported via the concept of upgradeable modules.\n");
3288     os::closedir(dir);
3289     return JNI_ERR;
3290   }
3291 
3292   sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3293   dir = os::opendir(path);
3294   if (dir != NULL) {
3295     jio_fprintf(defaultStream::output_stream(),
3296       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3297       "Use -classpath instead.\n.");
3298     os::closedir(dir);
3299     return JNI_ERR;
3300   }
3301 
3302   if (scp_assembly_required) {
3303     // Assemble the bootclasspath elements into the final path.
3304     char *combined_path = scp_p->combined_path();
3305     Arguments::set_sysclasspath(combined_path);
3306     FREE_C_HEAP_ARRAY(char, combined_path);
3307   }
3308 
3309   // This must be done after all arguments have been processed.
3310   // java_compiler() true means set to "NONE" or empty.
3311   if (java_compiler() && !xdebug_mode()) {
3312     // For backwards compatibility, we switch to interpreted mode if
3313     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3314     // not specified.
3315     set_mode_flags(_int);
3316   }
3317 
3318   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3319   // but like -Xint, leave compilation thresholds unaffected.
3320   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3321   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3322     set_mode_flags(_int);
3323   }
3324 
3325   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3326   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3327     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3328   }
3329 
3330 #ifndef COMPILER2
3331   // Don't degrade server performance for footprint
3332   if (FLAG_IS_DEFAULT(UseLargePages) &&
3333       MaxHeapSize < LargePageHeapSizeThreshold) {
3334     // No need for large granularity pages w/small heaps.
3335     // Note that large pages are enabled/disabled for both the
3336     // Java heap and the code cache.
3337     FLAG_SET_DEFAULT(UseLargePages, false);
3338   }
3339 
3340 #else
3341   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3342     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3343   }
3344 #endif
3345 
3346 #ifndef TIERED
3347   // Tiered compilation is undefined.
3348   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3349 #endif
3350 
3351   // If we are running in a headless jre, force java.awt.headless property
3352   // to be true unless the property has already been set.
3353   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3354   if (os::is_headless_jre()) {
3355     const char* headless = Arguments::get_property("java.awt.headless");
3356     if (headless == NULL) {
3357       const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3358       if (headless_env == NULL) {
3359         if (!add_property("java.awt.headless=true")) {
3360           return JNI_ENOMEM;
3361         }
3362       } else {
3363         char buffer[256];
3364         jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3365         if (!add_property(buffer)) {
3366           return JNI_ENOMEM;
3367         }
3368       }
3369     }
3370   }
3371 
3372   if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3373     // CMS can only be used with ParNew
3374     FLAG_SET_ERGO(bool, UseParNewGC, true);
3375   }
3376 
3377   if (!check_vm_args_consistency()) {
3378     return JNI_ERR;
3379   }
3380 
3381   return JNI_OK;
3382 }
3383 
3384 // Helper class for controlling the lifetime of JavaVMInitArgs
3385 // objects.  The contents of the JavaVMInitArgs are guaranteed to be
3386 // deleted on the destruction of the ScopedVMInitArgs object.
3387 class ScopedVMInitArgs : public StackObj {
3388  private:
3389   JavaVMInitArgs _args;
3390 
3391  public:
3392   ScopedVMInitArgs() {
3393     _args.version = JNI_VERSION_1_2;
3394     _args.nOptions = 0;
3395     _args.options = NULL;
3396     _args.ignoreUnrecognized = false;
3397   }
3398 
3399   // Populates the JavaVMInitArgs object represented by this
3400   // ScopedVMInitArgs object with the arguments in options.  The
3401   // allocated memory is deleted by the destructor.  If this method
3402   // returns anything other than JNI_OK, then this object is in a
3403   // partially constructed state, and should be abandoned.
3404   jint set_args(GrowableArray<JavaVMOption>* options) {
3405     JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3406         JavaVMOption, options->length(), mtInternal);
3407     if (options_arr == NULL) {
3408       return JNI_ENOMEM;
3409     }
3410     _args.options = options_arr;
3411 
3412     for (int i = 0; i < options->length(); i++) {
3413       options_arr[i] = options->at(i);
3414       options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3415       if (options_arr[i].optionString == NULL) {
3416         // Rely on the destructor to do cleanup.
3417         _args.nOptions = i;
3418         return JNI_ENOMEM;
3419       }
3420     }
3421 
3422     _args.nOptions = options->length();
3423     _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3424     return JNI_OK;
3425   }
3426 
3427   JavaVMInitArgs* get() { return &_args; }
3428 
3429   ~ScopedVMInitArgs() {
3430     if (_args.options == NULL) return;
3431     for (int i = 0; i < _args.nOptions; i++) {
3432       os::free(_args.options[i].optionString);
3433     }
3434     FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3435   }
3436 };
3437 
3438 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3439   return parse_options_environment_variable("_JAVA_OPTIONS", args);
3440 }
3441 
3442 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3443   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3444 }
3445 
3446 jint Arguments::parse_options_environment_variable(const char* name,
3447                                                    ScopedVMInitArgs* vm_args) {
3448   char *buffer = ::getenv(name);
3449 
3450   // Don't check this environment variable if user has special privileges
3451   // (e.g. unix su command).
3452   if (buffer == NULL || os::have_special_privileges()) {
3453     return JNI_OK;
3454   }
3455 
3456   if ((buffer = os::strdup(buffer)) == NULL) {
3457     return JNI_ENOMEM;
3458   }
3459 
3460   GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true);    // Construct option array
3461   jio_fprintf(defaultStream::error_stream(),
3462               "Picked up %s: %s\n", name, buffer);
3463   char* rd = buffer;                        // pointer to the input string (rd)
3464   while (true) {                            // repeat for all options in the input string
3465     while (isspace(*rd)) rd++;              // skip whitespace
3466     if (*rd == 0) break;                    // we re done when the input string is read completely
3467 
3468     // The output, option string, overwrites the input string.
3469     // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3470     // input string (rd).
3471     char* wrt = rd;
3472 
3473     JavaVMOption option;
3474     option.optionString = wrt;
3475     options->append(option);                // Fill in option
3476     while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3477       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3478         int quote = *rd;                    // matching quote to look for
3479         rd++;                               // don't copy open quote
3480         while (*rd != quote) {              // include everything (even spaces) up until quote
3481           if (*rd == 0) {                   // string termination means unmatched string
3482             jio_fprintf(defaultStream::error_stream(),
3483                         "Unmatched quote in %s\n", name);
3484             delete options;
3485             os::free(buffer);
3486             return JNI_ERR;
3487           }
3488           *wrt++ = *rd++;                   // copy to option string
3489         }
3490         rd++;                               // don't copy close quote
3491       } else {
3492         *wrt++ = *rd++;                     // copy to option string
3493       }
3494     }
3495     if (*rd != 0) {
3496       // In this case, the assignment to wrt below will make *rd nul,
3497       // which will interfere with the next loop iteration.
3498       rd++;
3499     }
3500     *wrt = 0;                               // Zero terminate option
3501   }
3502 
3503   // Fill out JavaVMInitArgs structure.
3504   jint status = vm_args->set_args(options);
3505 
3506   delete options;
3507   os::free(buffer);
3508   return status;
3509 }
3510 
3511 void Arguments::set_shared_spaces_flags() {
3512   if (DumpSharedSpaces) {
3513     if (RequireSharedSpaces) {
3514       warning("cannot dump shared archive while using shared archive");
3515     }
3516     UseSharedSpaces = false;
3517 #ifdef _LP64
3518     if (!UseCompressedOops || !UseCompressedClassPointers) {
3519       vm_exit_during_initialization(
3520         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3521     }
3522   } else {
3523     if (!UseCompressedOops || !UseCompressedClassPointers) {
3524       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3525     }
3526 #endif
3527   }
3528 }
3529 
3530 #if !INCLUDE_ALL_GCS
3531 static void force_serial_gc() {
3532   FLAG_SET_DEFAULT(UseSerialGC, true);
3533   UNSUPPORTED_GC_OPTION(UseG1GC);
3534   UNSUPPORTED_GC_OPTION(UseParallelGC);
3535   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3536   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3537   UNSUPPORTED_GC_OPTION(UseParNewGC);
3538 }
3539 #endif // INCLUDE_ALL_GCS
3540 
3541 // Sharing support
3542 // Construct the path to the archive
3543 static char* get_shared_archive_path() {
3544   char *shared_archive_path;
3545   if (SharedArchiveFile == NULL) {
3546     char jvm_path[JVM_MAXPATHLEN];
3547     os::jvm_path(jvm_path, sizeof(jvm_path));
3548     char *end = strrchr(jvm_path, *os::file_separator());
3549     if (end != NULL) *end = '\0';
3550     size_t jvm_path_len = strlen(jvm_path);
3551     size_t file_sep_len = strlen(os::file_separator());
3552     const size_t len = jvm_path_len + file_sep_len + 20;
3553     shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3554     if (shared_archive_path != NULL) {
3555       jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3556         jvm_path, os::file_separator());
3557     }
3558   } else {
3559     shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3560   }
3561   return shared_archive_path;
3562 }
3563 
3564 #ifndef PRODUCT
3565 // Determine whether LogVMOutput should be implicitly turned on.
3566 static bool use_vm_log() {
3567   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3568       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3569       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3570       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3571       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3572     return true;
3573   }
3574 
3575 #ifdef COMPILER1
3576   if (PrintC1Statistics) {
3577     return true;
3578   }
3579 #endif // COMPILER1
3580 
3581 #ifdef COMPILER2
3582   if (PrintOptoAssembly || PrintOptoStatistics) {
3583     return true;
3584   }
3585 #endif // COMPILER2
3586 
3587   return false;
3588 }
3589 #endif // PRODUCT
3590 
3591 static jint match_special_option_and_act(const JavaVMInitArgs* args,
3592                                         char** flags_file) {
3593   // Remaining part of option string
3594   const char* tail;
3595 
3596   for (int index = 0; index < args->nOptions; index++) {
3597     const JavaVMOption* option = args->options + index;
3598     if (ArgumentsExt::process_options(option)) {
3599       continue;
3600     }
3601     if (match_option(option, "-XX:Flags=", &tail)) {
3602       *flags_file = (char *) tail;
3603       continue;
3604     }
3605     if (match_option(option, "-XX:+PrintVMOptions")) {
3606       PrintVMOptions = true;
3607       continue;
3608     }
3609     if (match_option(option, "-XX:-PrintVMOptions")) {
3610       PrintVMOptions = false;
3611       continue;
3612     }
3613     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3614       IgnoreUnrecognizedVMOptions = true;
3615       continue;
3616     }
3617     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3618       IgnoreUnrecognizedVMOptions = false;
3619       continue;
3620     }
3621     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3622       CommandLineFlags::printFlags(tty, false);
3623       vm_exit(0);
3624     }
3625     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3626 #if INCLUDE_NMT
3627       // The launcher did not setup nmt environment variable properly.
3628       if (!MemTracker::check_launcher_nmt_support(tail)) {
3629         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3630       }
3631 
3632       // Verify if nmt option is valid.
3633       if (MemTracker::verify_nmt_option()) {
3634         // Late initialization, still in single-threaded mode.
3635         if (MemTracker::tracking_level() >= NMT_summary) {
3636           MemTracker::init();
3637         }
3638       } else {
3639         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3640       }
3641       continue;
3642 #else
3643       jio_fprintf(defaultStream::error_stream(),
3644         "Native Memory Tracking is not supported in this VM\n");
3645       return JNI_ERR;
3646 #endif
3647     }
3648 
3649 #ifndef PRODUCT
3650     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3651       CommandLineFlags::printFlags(tty, true);
3652       vm_exit(0);
3653     }
3654 #endif
3655   }
3656   return JNI_OK;
3657 }
3658 
3659 static void print_options(const JavaVMInitArgs *args) {
3660   const char* tail;
3661   for (int index = 0; index < args->nOptions; index++) {
3662     const JavaVMOption *option = args->options + index;
3663     if (match_option(option, "-XX:", &tail)) {
3664       logOption(tail);
3665     }
3666   }
3667 }
3668 
3669 // Parse entry point called from JNI_CreateJavaVM
3670 
3671 jint Arguments::parse(const JavaVMInitArgs* args) {
3672 
3673   // Initialize ranges and constraints
3674   CommandLineFlagRangeList::init();
3675   CommandLineFlagConstraintList::init();
3676 
3677   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3678   const char* hotspotrc = ".hotspotrc";
3679   char* flags_file = NULL;
3680   bool settings_file_specified = false;
3681   bool needs_hotspotrc_warning = false;
3682   ScopedVMInitArgs java_tool_options_args;
3683   ScopedVMInitArgs java_options_args;
3684 
3685   jint code =
3686       parse_java_tool_options_environment_variable(&java_tool_options_args);
3687   if (code != JNI_OK) {
3688     return code;
3689   }
3690 
3691   code = parse_java_options_environment_variable(&java_options_args);
3692   if (code != JNI_OK) {
3693     return code;
3694   }
3695 
3696   code =
3697       match_special_option_and_act(java_tool_options_args.get(), &flags_file);
3698   if (code != JNI_OK) {
3699     return code;
3700   }
3701 
3702   code = match_special_option_and_act(args, &flags_file);
3703   if (code != JNI_OK) {
3704     return code;
3705   }
3706 
3707   code = match_special_option_and_act(java_options_args.get(), &flags_file);
3708   if (code != JNI_OK) {
3709     return code;
3710   }
3711 
3712   settings_file_specified = (flags_file != NULL);
3713 
3714   if (IgnoreUnrecognizedVMOptions) {
3715     // uncast const to modify the flag args->ignoreUnrecognized
3716     *(jboolean*)(&args->ignoreUnrecognized) = true;
3717     java_tool_options_args.get()->ignoreUnrecognized = true;
3718     java_options_args.get()->ignoreUnrecognized = true;
3719   }
3720 
3721   // Parse specified settings file
3722   if (settings_file_specified) {
3723     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3724       return JNI_EINVAL;
3725     }
3726   } else {
3727 #ifdef ASSERT
3728     // Parse default .hotspotrc settings file
3729     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3730       return JNI_EINVAL;
3731     }
3732 #else
3733     struct stat buf;
3734     if (os::stat(hotspotrc, &buf) == 0) {
3735       needs_hotspotrc_warning = true;
3736     }
3737 #endif
3738   }
3739 
3740   if (PrintVMOptions) {
3741     print_options(java_tool_options_args.get());
3742     print_options(args);
3743     print_options(java_options_args.get());
3744   }
3745 
3746   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3747   jint result = parse_vm_init_args(java_tool_options_args.get(),
3748                                    java_options_args.get(), args);
3749 
3750   if (result != JNI_OK) {
3751     return result;
3752   }
3753 
3754   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3755   SharedArchivePath = get_shared_archive_path();
3756   if (SharedArchivePath == NULL) {
3757     return JNI_ENOMEM;
3758   }
3759 
3760   // Set up VerifySharedSpaces
3761   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3762     VerifySharedSpaces = true;
3763   }
3764 
3765   // Delay warning until here so that we've had a chance to process
3766   // the -XX:-PrintWarnings flag
3767   if (needs_hotspotrc_warning) {
3768     warning("%s file is present but has been ignored.  "
3769             "Run with -XX:Flags=%s to load the file.",
3770             hotspotrc, hotspotrc);
3771   }
3772 
3773 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
3774   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3775 #endif
3776 
3777   ArgumentsExt::report_unsupported_options();
3778 
3779 #ifndef PRODUCT
3780   if (TraceBytecodesAt != 0) {
3781     TraceBytecodes = true;
3782   }
3783   if (CountCompiledCalls) {
3784     if (UseCounterDecay) {
3785       warning("UseCounterDecay disabled because CountCalls is set");
3786       UseCounterDecay = false;
3787     }
3788   }
3789 #endif // PRODUCT
3790 
3791   if (ScavengeRootsInCode == 0) {
3792     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3793       warning("forcing ScavengeRootsInCode non-zero");
3794     }
3795     ScavengeRootsInCode = 1;
3796   }
3797 
3798   if (PrintGCDetails) {
3799     // Turn on -verbose:gc options as well
3800     PrintGC = true;
3801   }
3802 
3803   // Set object alignment values.
3804   set_object_alignment();
3805 
3806 #if !INCLUDE_ALL_GCS
3807   force_serial_gc();
3808 #endif // INCLUDE_ALL_GCS
3809 #if !INCLUDE_CDS
3810   if (DumpSharedSpaces || RequireSharedSpaces) {
3811     jio_fprintf(defaultStream::error_stream(),
3812       "Shared spaces are not supported in this VM\n");
3813     return JNI_ERR;
3814   }
3815   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3816     warning("Shared spaces are not supported in this VM");
3817     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3818     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3819   }
3820   no_shared_spaces("CDS Disabled");
3821 #endif // INCLUDE_CDS
3822 
3823   return JNI_OK;
3824 }
3825 
3826 jint Arguments::apply_ergo() {
3827 
3828   // Set flags based on ergonomics.
3829   set_ergonomics_flags();
3830 
3831   set_shared_spaces_flags();
3832 
3833   // Check the GC selections again.
3834   if (!check_gc_consistency()) {
3835     return JNI_EINVAL;
3836   }
3837 
3838   if (TieredCompilation) {
3839     set_tiered_flags();
3840   } else {
3841     int max_compilation_policy_choice = 1;
3842 #ifdef COMPILER2
3843     max_compilation_policy_choice = 2;
3844 #endif
3845     // Check if the policy is valid.
3846     if (CompilationPolicyChoice >= max_compilation_policy_choice) {
3847       vm_exit_during_initialization(
3848         "Incompatible compilation policy selected", NULL);
3849     }
3850     // Scale CompileThreshold
3851     // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3852     if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3853       FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3854     }
3855   }
3856 
3857 #ifdef COMPILER2
3858 #ifndef PRODUCT
3859   if (PrintIdealGraphLevel > 0) {
3860     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3861   }
3862 #endif
3863 #endif
3864 
3865   // Set heap size based on available physical memory
3866   set_heap_size();
3867 
3868   ArgumentsExt::set_gc_specific_flags();
3869 
3870   // Initialize Metaspace flags and alignments
3871   Metaspace::ergo_initialize();
3872 
3873   // Set bytecode rewriting flags
3874   set_bytecode_flags();
3875 
3876   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3877   set_aggressive_opts_flags();
3878 
3879   // Turn off biased locking for locking debug mode flags,
3880   // which are subtly different from each other but neither works with
3881   // biased locking
3882   if (UseHeavyMonitors
3883 #ifdef COMPILER1
3884       || !UseFastLocking
3885 #endif // COMPILER1
3886     ) {
3887     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3888       // flag set to true on command line; warn the user that they
3889       // can't enable biased locking here
3890       warning("Biased Locking is not supported with locking debug flags"
3891               "; ignoring UseBiasedLocking flag." );
3892     }
3893     UseBiasedLocking = false;
3894   }
3895 
3896 #ifdef ZERO
3897   // Clear flags not supported on zero.
3898   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3899   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3900   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3901   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3902 #endif // CC_INTERP
3903 
3904 #ifdef COMPILER2
3905   if (!EliminateLocks) {
3906     EliminateNestedLocks = false;
3907   }
3908   if (!Inline) {
3909     IncrementalInline = false;
3910   }
3911 #ifndef PRODUCT
3912   if (!IncrementalInline) {
3913     AlwaysIncrementalInline = false;
3914   }
3915 #endif
3916   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3917     // nothing to use the profiling, turn if off
3918     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3919   }
3920 #endif
3921 
3922   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3923     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3924     DebugNonSafepoints = true;
3925   }
3926 
3927   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3928     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3929   }
3930 
3931 #ifndef PRODUCT
3932   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3933     if (use_vm_log()) {
3934       LogVMOutput = true;
3935     }
3936   }
3937 #endif // PRODUCT
3938 
3939   if (PrintCommandLineFlags) {
3940     CommandLineFlags::printSetFlags(tty);
3941   }
3942 
3943   // Apply CPU specific policy for the BiasedLocking
3944   if (UseBiasedLocking) {
3945     if (!VM_Version::use_biased_locking() &&
3946         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3947       UseBiasedLocking = false;
3948     }
3949   }
3950 #ifdef COMPILER2
3951   if (!UseBiasedLocking || EmitSync != 0) {
3952     UseOptoBiasInlining = false;
3953   }
3954 #endif
3955 
3956   return JNI_OK;
3957 }
3958 
3959 jint Arguments::adjust_after_os() {
3960   if (UseNUMA) {
3961     if (UseParallelGC || UseParallelOldGC) {
3962       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3963          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3964       }
3965     }
3966     // UseNUMAInterleaving is set to ON for all collectors and
3967     // platforms when UseNUMA is set to ON. NUMA-aware collectors
3968     // such as the parallel collector for Linux and Solaris will
3969     // interleave old gen and survivor spaces on top of NUMA
3970     // allocation policy for the eden space.
3971     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3972     // all platforms and ParallelGC on Windows will interleave all
3973     // of the heap spaces across NUMA nodes.
3974     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3975       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3976     }
3977   }
3978   return JNI_OK;
3979 }
3980 
3981 // Any custom code post the 'CommandLineFlagConstraint::AfterErgo' constraint check
3982 // can be done here. We pass a flag that specifies whether
3983 // the check passed successfully
3984 void Arguments::post_after_ergo_constraint_check(bool check_passed) {
3985   // This does not set the flag itself, but stores the value in a safe place for later usage.
3986   _min_heap_free_ratio = MinHeapFreeRatio;
3987   _max_heap_free_ratio = MaxHeapFreeRatio;
3988 }
3989 
3990 int Arguments::PropertyList_count(SystemProperty* pl) {
3991   int count = 0;
3992   while(pl != NULL) {
3993     count++;
3994     pl = pl->next();
3995   }
3996   return count;
3997 }
3998 
3999 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4000   assert(key != NULL, "just checking");
4001   SystemProperty* prop;
4002   for (prop = pl; prop != NULL; prop = prop->next()) {
4003     if (strcmp(key, prop->key()) == 0) return prop->value();
4004   }
4005   return NULL;
4006 }
4007 
4008 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4009   int count = 0;
4010   const char* ret_val = NULL;
4011 
4012   while(pl != NULL) {
4013     if(count >= index) {
4014       ret_val = pl->key();
4015       break;
4016     }
4017     count++;
4018     pl = pl->next();
4019   }
4020 
4021   return ret_val;
4022 }
4023 
4024 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4025   int count = 0;
4026   char* ret_val = NULL;
4027 
4028   while(pl != NULL) {
4029     if(count >= index) {
4030       ret_val = pl->value();
4031       break;
4032     }
4033     count++;
4034     pl = pl->next();
4035   }
4036 
4037   return ret_val;
4038 }
4039 
4040 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4041   SystemProperty* p = *plist;
4042   if (p == NULL) {
4043     *plist = new_p;
4044   } else {
4045     while (p->next() != NULL) {
4046       p = p->next();
4047     }
4048     p->set_next(new_p);
4049   }
4050 }
4051 
4052 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4053   if (plist == NULL)
4054     return;
4055 
4056   SystemProperty* new_p = new SystemProperty(k, v, true);
4057   PropertyList_add(plist, new_p);
4058 }
4059 
4060 void Arguments::PropertyList_add(SystemProperty *element) {
4061   PropertyList_add(&_system_properties, element);
4062 }
4063 
4064 // This add maintains unique property key in the list.
4065 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4066   if (plist == NULL)
4067     return;
4068 
4069   // If property key exist then update with new value.
4070   SystemProperty* prop;
4071   for (prop = *plist; prop != NULL; prop = prop->next()) {
4072     if (strcmp(k, prop->key()) == 0) {
4073       if (append) {
4074         prop->append_value(v);
4075       } else {
4076         prop->set_value(v);
4077       }
4078       return;
4079     }
4080   }
4081 
4082   PropertyList_add(plist, k, v);
4083 }
4084 
4085 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4086 // Returns true if all of the source pointed by src has been copied over to
4087 // the destination buffer pointed by buf. Otherwise, returns false.
4088 // Notes:
4089 // 1. If the length (buflen) of the destination buffer excluding the
4090 // NULL terminator character is not long enough for holding the expanded
4091 // pid characters, it also returns false instead of returning the partially
4092 // expanded one.
4093 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4094 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4095                                 char* buf, size_t buflen) {
4096   const char* p = src;
4097   char* b = buf;
4098   const char* src_end = &src[srclen];
4099   char* buf_end = &buf[buflen - 1];
4100 
4101   while (p < src_end && b < buf_end) {
4102     if (*p == '%') {
4103       switch (*(++p)) {
4104       case '%':         // "%%" ==> "%"
4105         *b++ = *p++;
4106         break;
4107       case 'p':  {       //  "%p" ==> current process id
4108         // buf_end points to the character before the last character so
4109         // that we could write '\0' to the end of the buffer.
4110         size_t buf_sz = buf_end - b + 1;
4111         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4112 
4113         // if jio_snprintf fails or the buffer is not long enough to hold
4114         // the expanded pid, returns false.
4115         if (ret < 0 || ret >= (int)buf_sz) {
4116           return false;
4117         } else {
4118           b += ret;
4119           assert(*b == '\0', "fail in copy_expand_pid");
4120           if (p == src_end && b == buf_end + 1) {
4121             // reach the end of the buffer.
4122             return true;
4123           }
4124         }
4125         p++;
4126         break;
4127       }
4128       default :
4129         *b++ = '%';
4130       }
4131     } else {
4132       *b++ = *p++;
4133     }
4134   }
4135   *b = '\0';
4136   return (p == src_end); // return false if not all of the source was copied
4137 }