1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/javaAssertions.hpp"
  27 #include "classfile/symbolTable.hpp"
  28 #include "compiler/compilerOracle.hpp"
  29 #include "memory/allocation.inline.hpp"
  30 #include "memory/cardTableRS.hpp"
  31 #include "memory/genCollectedHeap.hpp"
  32 #include "memory/referenceProcessor.hpp"
  33 #include "memory/universe.inline.hpp"
  34 #include "oops/oop.inline.hpp"
  35 #include "prims/jvmtiExport.hpp"
  36 #include "runtime/arguments.hpp"
  37 #include "runtime/globals_extension.hpp"
  38 #include "runtime/java.hpp"
  39 #include "services/management.hpp"
  40 #include "services/memTracker.hpp"
  41 #include "utilities/defaultStream.hpp"
  42 #include "utilities/macros.hpp"
  43 #include "utilities/taskqueue.hpp"
  44 #ifdef TARGET_OS_FAMILY_linux
  45 # include "os_linux.inline.hpp"
  46 #endif
  47 #ifdef TARGET_OS_FAMILY_solaris
  48 # include "os_solaris.inline.hpp"
  49 #endif
  50 #ifdef TARGET_OS_FAMILY_windows
  51 # include "os_windows.inline.hpp"
  52 #endif
  53 #ifdef TARGET_OS_FAMILY_bsd
  54 # include "os_bsd.inline.hpp"
  55 #endif
  56 #if INCLUDE_ALL_GCS
  57 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  58 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  59 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  60 #endif // INCLUDE_ALL_GCS
  61 
  62 // Note: This is a special bug reporting site for the JVM
  63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
  64 #define DEFAULT_JAVA_LAUNCHER  "generic"
  65 
  66 // Disable options not supported in this release, with a warning if they
  67 // were explicitly requested on the command-line
  68 #define UNSUPPORTED_OPTION(opt, description)                    \
  69 do {                                                            \
  70   if (opt) {                                                    \
  71     if (FLAG_IS_CMDLINE(opt)) {                                 \
  72       warning(description " is disabled in this release.");     \
  73     }                                                           \
  74     FLAG_SET_DEFAULT(opt, false);                               \
  75   }                                                             \
  76 } while(0)
  77 
  78 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  79 do {                                                                  \
  80   if (gc) {                                                           \
  81     if (FLAG_IS_CMDLINE(gc)) {                                        \
  82       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  83     }                                                                 \
  84     FLAG_SET_DEFAULT(gc, false);                                      \
  85   }                                                                   \
  86 } while(0)
  87 
  88 char**  Arguments::_jvm_flags_array             = NULL;
  89 int     Arguments::_num_jvm_flags               = 0;
  90 char**  Arguments::_jvm_args_array              = NULL;
  91 int     Arguments::_num_jvm_args                = 0;
  92 char*  Arguments::_java_command                 = NULL;
  93 SystemProperty* Arguments::_system_properties   = NULL;
  94 const char*  Arguments::_gc_log_filename        = NULL;
  95 bool   Arguments::_has_profile                  = false;
  96 size_t Arguments::_conservative_max_heap_alignment = 0;
  97 uintx  Arguments::_min_heap_size                = 0;
  98 Arguments::Mode Arguments::_mode                = _mixed;
  99 bool   Arguments::_java_compiler                = false;
 100 bool   Arguments::_xdebug_mode                  = false;
 101 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
 102 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
 103 int    Arguments::_sun_java_launcher_pid        = -1;
 104 bool   Arguments::_created_by_gamma_launcher    = false;
 105 
 106 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
 107 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 108 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 109 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 110 bool   Arguments::_ClipInlining                 = ClipInlining;
 111 
 112 char*  Arguments::SharedArchivePath             = NULL;
 113 
 114 AgentLibraryList Arguments::_libraryList;
 115 AgentLibraryList Arguments::_agentList;
 116 
 117 abort_hook_t     Arguments::_abort_hook         = NULL;
 118 exit_hook_t      Arguments::_exit_hook          = NULL;
 119 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 120 
 121 
 122 SystemProperty *Arguments::_java_ext_dirs = NULL;
 123 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
 124 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 125 SystemProperty *Arguments::_java_library_path = NULL;
 126 SystemProperty *Arguments::_java_home = NULL;
 127 SystemProperty *Arguments::_java_class_path = NULL;
 128 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 129 
 130 char* Arguments::_meta_index_path = NULL;
 131 char* Arguments::_meta_index_dir = NULL;
 132 
 133 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
 134 
 135 static bool match_option(const JavaVMOption *option, const char* name,
 136                          const char** tail) {
 137   int len = (int)strlen(name);
 138   if (strncmp(option->optionString, name, len) == 0) {
 139     *tail = option->optionString + len;
 140     return true;
 141   } else {
 142     return false;
 143   }
 144 }
 145 
 146 static void logOption(const char* opt) {
 147   if (PrintVMOptions) {
 148     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 149   }
 150 }
 151 
 152 // Process java launcher properties.
 153 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 154   // See if sun.java.launcher or sun.java.launcher.pid is defined.
 155   // Must do this before setting up other system properties,
 156   // as some of them may depend on launcher type.
 157   for (int index = 0; index < args->nOptions; index++) {
 158     const JavaVMOption* option = args->options + index;
 159     const char* tail;
 160 
 161     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 162       process_java_launcher_argument(tail, option->extraInfo);
 163       continue;
 164     }
 165     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 166       _sun_java_launcher_pid = atoi(tail);
 167       continue;
 168     }
 169   }
 170 }
 171 
 172 // Initialize system properties key and value.
 173 void Arguments::init_system_properties() {
 174 
 175   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 176                                                                  "Java Virtual Machine Specification",  false));
 177   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 178   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 179   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 180 
 181   // following are JVMTI agent writeable properties.
 182   // Properties values are set to NULL and they are
 183   // os specific they are initialized in os::init_system_properties_values().
 184   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 185   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 186   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 187   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 188   _java_home =  new SystemProperty("java.home", NULL,  true);
 189   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 190 
 191   _java_class_path = new SystemProperty("java.class.path", "",  true);
 192 
 193   // Add to System Property list.
 194   PropertyList_add(&_system_properties, _java_ext_dirs);
 195   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 196   PropertyList_add(&_system_properties, _sun_boot_library_path);
 197   PropertyList_add(&_system_properties, _java_library_path);
 198   PropertyList_add(&_system_properties, _java_home);
 199   PropertyList_add(&_system_properties, _java_class_path);
 200   PropertyList_add(&_system_properties, _sun_boot_class_path);
 201 
 202   // Set OS specific system properties values
 203   os::init_system_properties_values();
 204 }
 205 
 206 
 207   // Update/Initialize System properties after JDK version number is known
 208 void Arguments::init_version_specific_system_properties() {
 209   enum { bufsz = 16 };
 210   char buffer[bufsz];
 211   const char* spec_vendor = "Sun Microsystems Inc.";
 212   uint32_t spec_version = 0;
 213 
 214   if (JDK_Version::is_gte_jdk17x_version()) {
 215     spec_vendor = "Oracle Corporation";
 216     spec_version = JDK_Version::current().major_version();
 217   }
 218   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 219 
 220   PropertyList_add(&_system_properties,
 221       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 222   PropertyList_add(&_system_properties,
 223       new SystemProperty("java.vm.specification.version", buffer, false));
 224   PropertyList_add(&_system_properties,
 225       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 226 }
 227 
 228 /**
 229  * Provide a slightly more user-friendly way of eliminating -XX flags.
 230  * When a flag is eliminated, it can be added to this list in order to
 231  * continue accepting this flag on the command-line, while issuing a warning
 232  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 233  * limit, we flatly refuse to admit the existence of the flag.  This allows
 234  * a flag to die correctly over JDK releases using HSX.
 235  */
 236 typedef struct {
 237   const char* name;
 238   JDK_Version obsoleted_in; // when the flag went away
 239   JDK_Version accept_until; // which version to start denying the existence
 240 } ObsoleteFlag;
 241 
 242 static ObsoleteFlag obsolete_jvm_flags[] = {
 243   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 244   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 245   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 246   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 247   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 248   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 249   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 250   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 251   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 252   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 253   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 254   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 255   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 256   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 257   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 258   { "DefaultInitialRAMFraction",
 259                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 260   { "UseDepthFirstScavengeOrder",
 261                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 262   { "HandlePromotionFailure",
 263                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 264   { "MaxLiveObjectEvacuationRatio",
 265                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 266   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 267   { "UseParallelOldGCCompacting",
 268                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 269   { "UseParallelDensePrefixUpdate",
 270                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 271   { "UseParallelOldGCDensePrefix",
 272                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 273   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 274   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 275   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 276   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 277   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 278   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 279   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 280   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 281   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 282   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 283   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 284   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 285   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 286   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 287   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 288   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 289   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 290   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 291   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 292   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 293   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 294 #ifdef PRODUCT
 295   { "DesiredMethodLimit",
 296                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 297 #endif // PRODUCT
 298   { NULL, JDK_Version(0), JDK_Version(0) }
 299 };
 300 
 301 // Returns true if the flag is obsolete and fits into the range specified
 302 // for being ignored.  In the case that the flag is ignored, the 'version'
 303 // value is filled in with the version number when the flag became
 304 // obsolete so that that value can be displayed to the user.
 305 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 306   int i = 0;
 307   assert(version != NULL, "Must provide a version buffer");
 308   while (obsolete_jvm_flags[i].name != NULL) {
 309     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 310     // <flag>=xxx form
 311     // [-|+]<flag> form
 312     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 313         ((s[0] == '+' || s[0] == '-') &&
 314         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 315       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 316           *version = flag_status.obsoleted_in;
 317           return true;
 318       }
 319     }
 320     i++;
 321   }
 322   return false;
 323 }
 324 
 325 // Constructs the system class path (aka boot class path) from the following
 326 // components, in order:
 327 //
 328 //     prefix           // from -Xbootclasspath/p:...
 329 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 330 //     base             // from os::get_system_properties() or -Xbootclasspath=
 331 //     suffix           // from -Xbootclasspath/a:...
 332 //
 333 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 334 // directories are added to the sysclasspath just before the base.
 335 //
 336 // This could be AllStatic, but it isn't needed after argument processing is
 337 // complete.
 338 class SysClassPath: public StackObj {
 339 public:
 340   SysClassPath(const char* base);
 341   ~SysClassPath();
 342 
 343   inline void set_base(const char* base);
 344   inline void add_prefix(const char* prefix);
 345   inline void add_suffix_to_prefix(const char* suffix);
 346   inline void add_suffix(const char* suffix);
 347   inline void reset_path(const char* base);
 348 
 349   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 350   // property.  Must be called after all command-line arguments have been
 351   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 352   // combined_path().
 353   void expand_endorsed();
 354 
 355   inline const char* get_base()     const { return _items[_scp_base]; }
 356   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 357   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 358   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 359 
 360   // Combine all the components into a single c-heap-allocated string; caller
 361   // must free the string if/when no longer needed.
 362   char* combined_path();
 363 
 364 private:
 365   // Utility routines.
 366   static char* add_to_path(const char* path, const char* str, bool prepend);
 367   static char* add_jars_to_path(char* path, const char* directory);
 368 
 369   inline void reset_item_at(int index);
 370 
 371   // Array indices for the items that make up the sysclasspath.  All except the
 372   // base are allocated in the C heap and freed by this class.
 373   enum {
 374     _scp_prefix,        // from -Xbootclasspath/p:...
 375     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 376     _scp_base,          // the default sysclasspath
 377     _scp_suffix,        // from -Xbootclasspath/a:...
 378     _scp_nitems         // the number of items, must be last.
 379   };
 380 
 381   const char* _items[_scp_nitems];
 382   DEBUG_ONLY(bool _expansion_done;)
 383 };
 384 
 385 SysClassPath::SysClassPath(const char* base) {
 386   memset(_items, 0, sizeof(_items));
 387   _items[_scp_base] = base;
 388   DEBUG_ONLY(_expansion_done = false;)
 389 }
 390 
 391 SysClassPath::~SysClassPath() {
 392   // Free everything except the base.
 393   for (int i = 0; i < _scp_nitems; ++i) {
 394     if (i != _scp_base) reset_item_at(i);
 395   }
 396   DEBUG_ONLY(_expansion_done = false;)
 397 }
 398 
 399 inline void SysClassPath::set_base(const char* base) {
 400   _items[_scp_base] = base;
 401 }
 402 
 403 inline void SysClassPath::add_prefix(const char* prefix) {
 404   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 405 }
 406 
 407 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 408   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 409 }
 410 
 411 inline void SysClassPath::add_suffix(const char* suffix) {
 412   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 413 }
 414 
 415 inline void SysClassPath::reset_item_at(int index) {
 416   assert(index < _scp_nitems && index != _scp_base, "just checking");
 417   if (_items[index] != NULL) {
 418     FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
 419     _items[index] = NULL;
 420   }
 421 }
 422 
 423 inline void SysClassPath::reset_path(const char* base) {
 424   // Clear the prefix and suffix.
 425   reset_item_at(_scp_prefix);
 426   reset_item_at(_scp_suffix);
 427   set_base(base);
 428 }
 429 
 430 //------------------------------------------------------------------------------
 431 
 432 void SysClassPath::expand_endorsed() {
 433   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 434 
 435   const char* path = Arguments::get_property("java.endorsed.dirs");
 436   if (path == NULL) {
 437     path = Arguments::get_endorsed_dir();
 438     assert(path != NULL, "no default for java.endorsed.dirs");
 439   }
 440 
 441   char* expanded_path = NULL;
 442   const char separator = *os::path_separator();
 443   const char* const end = path + strlen(path);
 444   while (path < end) {
 445     const char* tmp_end = strchr(path, separator);
 446     if (tmp_end == NULL) {
 447       expanded_path = add_jars_to_path(expanded_path, path);
 448       path = end;
 449     } else {
 450       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
 451       memcpy(dirpath, path, tmp_end - path);
 452       dirpath[tmp_end - path] = '\0';
 453       expanded_path = add_jars_to_path(expanded_path, dirpath);
 454       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
 455       path = tmp_end + 1;
 456     }
 457   }
 458   _items[_scp_endorsed] = expanded_path;
 459   DEBUG_ONLY(_expansion_done = true;)
 460 }
 461 
 462 // Combine the bootclasspath elements, some of which may be null, into a single
 463 // c-heap-allocated string.
 464 char* SysClassPath::combined_path() {
 465   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 466   assert(_expansion_done, "must call expand_endorsed() first.");
 467 
 468   size_t lengths[_scp_nitems];
 469   size_t total_len = 0;
 470 
 471   const char separator = *os::path_separator();
 472 
 473   // Get the lengths.
 474   int i;
 475   for (i = 0; i < _scp_nitems; ++i) {
 476     if (_items[i] != NULL) {
 477       lengths[i] = strlen(_items[i]);
 478       // Include space for the separator char (or a NULL for the last item).
 479       total_len += lengths[i] + 1;
 480     }
 481   }
 482   assert(total_len > 0, "empty sysclasspath not allowed");
 483 
 484   // Copy the _items to a single string.
 485   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 486   char* cp_tmp = cp;
 487   for (i = 0; i < _scp_nitems; ++i) {
 488     if (_items[i] != NULL) {
 489       memcpy(cp_tmp, _items[i], lengths[i]);
 490       cp_tmp += lengths[i];
 491       *cp_tmp++ = separator;
 492     }
 493   }
 494   *--cp_tmp = '\0';     // Replace the extra separator.
 495   return cp;
 496 }
 497 
 498 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 499 char*
 500 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 501   char *cp;
 502 
 503   assert(str != NULL, "just checking");
 504   if (path == NULL) {
 505     size_t len = strlen(str) + 1;
 506     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 507     memcpy(cp, str, len);                       // copy the trailing null
 508   } else {
 509     const char separator = *os::path_separator();
 510     size_t old_len = strlen(path);
 511     size_t str_len = strlen(str);
 512     size_t len = old_len + str_len + 2;
 513 
 514     if (prepend) {
 515       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 516       char* cp_tmp = cp;
 517       memcpy(cp_tmp, str, str_len);
 518       cp_tmp += str_len;
 519       *cp_tmp = separator;
 520       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 521       FREE_C_HEAP_ARRAY(char, path, mtInternal);
 522     } else {
 523       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 524       char* cp_tmp = cp + old_len;
 525       *cp_tmp = separator;
 526       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 527     }
 528   }
 529   return cp;
 530 }
 531 
 532 // Scan the directory and append any jar or zip files found to path.
 533 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 534 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 535   DIR* dir = os::opendir(directory);
 536   if (dir == NULL) return path;
 537 
 538   char dir_sep[2] = { '\0', '\0' };
 539   size_t directory_len = strlen(directory);
 540   const char fileSep = *os::file_separator();
 541   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 542 
 543   /* Scan the directory for jars/zips, appending them to path. */
 544   struct dirent *entry;
 545   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 546   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 547     const char* name = entry->d_name;
 548     const char* ext = name + strlen(name) - 4;
 549     bool isJarOrZip = ext > name &&
 550       (os::file_name_strcmp(ext, ".jar") == 0 ||
 551        os::file_name_strcmp(ext, ".zip") == 0);
 552     if (isJarOrZip) {
 553       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 554       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 555       path = add_to_path(path, jarpath, false);
 556       FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
 557     }
 558   }
 559   FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
 560   os::closedir(dir);
 561   return path;
 562 }
 563 
 564 // Parses a memory size specification string.
 565 static bool atomull(const char *s, julong* result) {
 566   julong n = 0;
 567   int args_read = sscanf(s, JULONG_FORMAT, &n);
 568   if (args_read != 1) {
 569     return false;
 570   }
 571   while (*s != '\0' && isdigit(*s)) {
 572     s++;
 573   }
 574   // 4705540: illegal if more characters are found after the first non-digit
 575   if (strlen(s) > 1) {
 576     return false;
 577   }
 578   switch (*s) {
 579     case 'T': case 't':
 580       *result = n * G * K;
 581       // Check for overflow.
 582       if (*result/((julong)G * K) != n) return false;
 583       return true;
 584     case 'G': case 'g':
 585       *result = n * G;
 586       if (*result/G != n) return false;
 587       return true;
 588     case 'M': case 'm':
 589       *result = n * M;
 590       if (*result/M != n) return false;
 591       return true;
 592     case 'K': case 'k':
 593       *result = n * K;
 594       if (*result/K != n) return false;
 595       return true;
 596     case '\0':
 597       *result = n;
 598       return true;
 599     default:
 600       return false;
 601   }
 602 }
 603 
 604 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 605   if (size < min_size) return arg_too_small;
 606   // Check that size will fit in a size_t (only relevant on 32-bit)
 607   if (size > max_uintx) return arg_too_big;
 608   return arg_in_range;
 609 }
 610 
 611 // Describe an argument out of range error
 612 void Arguments::describe_range_error(ArgsRange errcode) {
 613   switch(errcode) {
 614   case arg_too_big:
 615     jio_fprintf(defaultStream::error_stream(),
 616                 "The specified size exceeds the maximum "
 617                 "representable size.\n");
 618     break;
 619   case arg_too_small:
 620   case arg_unreadable:
 621   case arg_in_range:
 622     // do nothing for now
 623     break;
 624   default:
 625     ShouldNotReachHere();
 626   }
 627 }
 628 
 629 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 630   return CommandLineFlags::boolAtPut(name, &value, origin);
 631 }
 632 
 633 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 634   double v;
 635   if (sscanf(value, "%lf", &v) != 1) {
 636     return false;
 637   }
 638 
 639   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 640     return true;
 641   }
 642   return false;
 643 }
 644 
 645 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 646   julong v;
 647   intx intx_v;
 648   bool is_neg = false;
 649   // Check the sign first since atomull() parses only unsigned values.
 650   if (*value == '-') {
 651     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 652       return false;
 653     }
 654     value++;
 655     is_neg = true;
 656   }
 657   if (!atomull(value, &v)) {
 658     return false;
 659   }
 660   intx_v = (intx) v;
 661   if (is_neg) {
 662     intx_v = -intx_v;
 663   }
 664   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 665     return true;
 666   }
 667   uintx uintx_v = (uintx) v;
 668   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 669     return true;
 670   }
 671   uint64_t uint64_t_v = (uint64_t) v;
 672   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 673     return true;
 674   }
 675   return false;
 676 }
 677 
 678 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 679   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 680   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 681   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 682   return true;
 683 }
 684 
 685 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 686   const char* old_value = "";
 687   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 688   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 689   size_t new_len = strlen(new_value);
 690   const char* value;
 691   char* free_this_too = NULL;
 692   if (old_len == 0) {
 693     value = new_value;
 694   } else if (new_len == 0) {
 695     value = old_value;
 696   } else {
 697     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 698     // each new setting adds another LINE to the switch:
 699     sprintf(buf, "%s\n%s", old_value, new_value);
 700     value = buf;
 701     free_this_too = buf;
 702   }
 703   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 704   // CommandLineFlags always returns a pointer that needs freeing.
 705   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 706   if (free_this_too != NULL) {
 707     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 708     FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
 709   }
 710   return true;
 711 }
 712 
 713 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 714 
 715   // range of acceptable characters spelled out for portability reasons
 716 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 717 #define BUFLEN 255
 718   char name[BUFLEN+1];
 719   char dummy;
 720 
 721   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 722     return set_bool_flag(name, false, origin);
 723   }
 724   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 725     return set_bool_flag(name, true, origin);
 726   }
 727 
 728   char punct;
 729   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 730     const char* value = strchr(arg, '=') + 1;
 731     Flag* flag = Flag::find_flag(name, strlen(name));
 732     if (flag != NULL && flag->is_ccstr()) {
 733       if (flag->ccstr_accumulates()) {
 734         return append_to_string_flag(name, value, origin);
 735       } else {
 736         if (value[0] == '\0') {
 737           value = NULL;
 738         }
 739         return set_string_flag(name, value, origin);
 740       }
 741     }
 742   }
 743 
 744   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 745     const char* value = strchr(arg, '=') + 1;
 746     // -XX:Foo:=xxx will reset the string flag to the given value.
 747     if (value[0] == '\0') {
 748       value = NULL;
 749     }
 750     return set_string_flag(name, value, origin);
 751   }
 752 
 753 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 754 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 755 #define        NUMBER_RANGE    "[0123456789]"
 756   char value[BUFLEN + 1];
 757   char value2[BUFLEN + 1];
 758   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 759     // Looks like a floating-point number -- try again with more lenient format string
 760     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 761       return set_fp_numeric_flag(name, value, origin);
 762     }
 763   }
 764 
 765 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 766   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 767     return set_numeric_flag(name, value, origin);
 768   }
 769 
 770   return false;
 771 }
 772 
 773 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 774   assert(bldarray != NULL, "illegal argument");
 775 
 776   if (arg == NULL) {
 777     return;
 778   }
 779 
 780   int new_count = *count + 1;
 781 
 782   // expand the array and add arg to the last element
 783   if (*bldarray == NULL) {
 784     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 785   } else {
 786     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 787   }
 788   (*bldarray)[*count] = strdup(arg);
 789   *count = new_count;
 790 }
 791 
 792 void Arguments::build_jvm_args(const char* arg) {
 793   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 794 }
 795 
 796 void Arguments::build_jvm_flags(const char* arg) {
 797   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 798 }
 799 
 800 // utility function to return a string that concatenates all
 801 // strings in a given char** array
 802 const char* Arguments::build_resource_string(char** args, int count) {
 803   if (args == NULL || count == 0) {
 804     return NULL;
 805   }
 806   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 807   for (int i = 1; i < count; i++) {
 808     length += strlen(args[i]) + 1; // add 1 for a space
 809   }
 810   char* s = NEW_RESOURCE_ARRAY(char, length);
 811   strcpy(s, args[0]);
 812   for (int j = 1; j < count; j++) {
 813     strcat(s, " ");
 814     strcat(s, args[j]);
 815   }
 816   return (const char*) s;
 817 }
 818 
 819 void Arguments::print_on(outputStream* st) {
 820   st->print_cr("VM Arguments:");
 821   if (num_jvm_flags() > 0) {
 822     st->print("jvm_flags: "); print_jvm_flags_on(st);
 823   }
 824   if (num_jvm_args() > 0) {
 825     st->print("jvm_args: "); print_jvm_args_on(st);
 826   }
 827   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 828   if (_java_class_path != NULL) {
 829     char* path = _java_class_path->value();
 830     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 831   }
 832   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 833 }
 834 
 835 void Arguments::print_jvm_flags_on(outputStream* st) {
 836   if (_num_jvm_flags > 0) {
 837     for (int i=0; i < _num_jvm_flags; i++) {
 838       st->print("%s ", _jvm_flags_array[i]);
 839     }
 840     st->print_cr("");
 841   }
 842 }
 843 
 844 void Arguments::print_jvm_args_on(outputStream* st) {
 845   if (_num_jvm_args > 0) {
 846     for (int i=0; i < _num_jvm_args; i++) {
 847       st->print("%s ", _jvm_args_array[i]);
 848     }
 849     st->print_cr("");
 850   }
 851 }
 852 
 853 bool Arguments::process_argument(const char* arg,
 854     jboolean ignore_unrecognized, Flag::Flags origin) {
 855 
 856   JDK_Version since = JDK_Version();
 857 
 858   if (parse_argument(arg, origin) || ignore_unrecognized) {
 859     return true;
 860   }
 861 
 862   bool has_plus_minus = (*arg == '+' || *arg == '-');
 863   const char* const argname = has_plus_minus ? arg + 1 : arg;
 864   if (is_newly_obsolete(arg, &since)) {
 865     char version[256];
 866     since.to_string(version, sizeof(version));
 867     warning("ignoring option %s; support was removed in %s", argname, version);
 868     return true;
 869   }
 870 
 871   // For locked flags, report a custom error message if available.
 872   // Otherwise, report the standard unrecognized VM option.
 873 
 874   size_t arg_len;
 875   const char* equal_sign = strchr(argname, '=');
 876   if (equal_sign == NULL) {
 877     arg_len = strlen(argname);
 878   } else {
 879     arg_len = equal_sign - argname;
 880   }
 881 
 882   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 883   if (found_flag != NULL) {
 884     char locked_message_buf[BUFLEN];
 885     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 886     if (strlen(locked_message_buf) == 0) {
 887       if (found_flag->is_bool() && !has_plus_minus) {
 888         jio_fprintf(defaultStream::error_stream(),
 889           "Missing +/- setting for VM option '%s'\n", argname);
 890       } else if (!found_flag->is_bool() && has_plus_minus) {
 891         jio_fprintf(defaultStream::error_stream(),
 892           "Unexpected +/- setting in VM option '%s'\n", argname);
 893       } else {
 894         jio_fprintf(defaultStream::error_stream(),
 895           "Improperly specified VM option '%s'\n", argname);
 896       }
 897     } else {
 898       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 899     }
 900   } else {
 901     jio_fprintf(defaultStream::error_stream(),
 902                 "Unrecognized VM option '%s'\n", argname);
 903     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 904     if (fuzzy_matched != NULL) {
 905       jio_fprintf(defaultStream::error_stream(),
 906                   "Did you mean '%s%s%s'?\n",
 907                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 908                   fuzzy_matched->_name,
 909                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 910     }
 911   }
 912 
 913   // allow for commandline "commenting out" options like -XX:#+Verbose
 914   return arg[0] == '#';
 915 }
 916 
 917 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 918   FILE* stream = fopen(file_name, "rb");
 919   if (stream == NULL) {
 920     if (should_exist) {
 921       jio_fprintf(defaultStream::error_stream(),
 922                   "Could not open settings file %s\n", file_name);
 923       return false;
 924     } else {
 925       return true;
 926     }
 927   }
 928 
 929   char token[1024];
 930   int  pos = 0;
 931 
 932   bool in_white_space = true;
 933   bool in_comment     = false;
 934   bool in_quote       = false;
 935   char quote_c        = 0;
 936   bool result         = true;
 937 
 938   int c = getc(stream);
 939   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 940     if (in_white_space) {
 941       if (in_comment) {
 942         if (c == '\n') in_comment = false;
 943       } else {
 944         if (c == '#') in_comment = true;
 945         else if (!isspace(c)) {
 946           in_white_space = false;
 947           token[pos++] = c;
 948         }
 949       }
 950     } else {
 951       if (c == '\n' || (!in_quote && isspace(c))) {
 952         // token ends at newline, or at unquoted whitespace
 953         // this allows a way to include spaces in string-valued options
 954         token[pos] = '\0';
 955         logOption(token);
 956         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 957         build_jvm_flags(token);
 958         pos = 0;
 959         in_white_space = true;
 960         in_quote = false;
 961       } else if (!in_quote && (c == '\'' || c == '"')) {
 962         in_quote = true;
 963         quote_c = c;
 964       } else if (in_quote && (c == quote_c)) {
 965         in_quote = false;
 966       } else {
 967         token[pos++] = c;
 968       }
 969     }
 970     c = getc(stream);
 971   }
 972   if (pos > 0) {
 973     token[pos] = '\0';
 974     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 975     build_jvm_flags(token);
 976   }
 977   fclose(stream);
 978   return result;
 979 }
 980 
 981 //=============================================================================================================
 982 // Parsing of properties (-D)
 983 
 984 const char* Arguments::get_property(const char* key) {
 985   return PropertyList_get_value(system_properties(), key);
 986 }
 987 
 988 bool Arguments::add_property(const char* prop) {
 989   const char* eq = strchr(prop, '=');
 990   char* key;
 991   // ns must be static--its address may be stored in a SystemProperty object.
 992   const static char ns[1] = {0};
 993   char* value = (char *)ns;
 994 
 995   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
 996   key = AllocateHeap(key_len + 1, mtInternal);
 997   strncpy(key, prop, key_len);
 998   key[key_len] = '\0';
 999 
1000   if (eq != NULL) {
1001     size_t value_len = strlen(prop) - key_len - 1;
1002     value = AllocateHeap(value_len + 1, mtInternal);
1003     strncpy(value, &prop[key_len + 1], value_len + 1);
1004   }
1005 
1006   if (strcmp(key, "java.compiler") == 0) {
1007     process_java_compiler_argument(value);
1008     FreeHeap(key);
1009     if (eq != NULL) {
1010       FreeHeap(value);
1011     }
1012     return true;
1013   } else if (strcmp(key, "sun.java.command") == 0) {
1014     _java_command = value;
1015 
1016     // Record value in Arguments, but let it get passed to Java.
1017   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1018     // launcher.pid property is private and is processed
1019     // in process_sun_java_launcher_properties();
1020     // the sun.java.launcher property is passed on to the java application
1021     FreeHeap(key);
1022     if (eq != NULL) {
1023       FreeHeap(value);
1024     }
1025     return true;
1026   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1027     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1028     // its value without going through the property list or making a Java call.
1029     _java_vendor_url_bug = value;
1030   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1031     PropertyList_unique_add(&_system_properties, key, value, true);
1032     return true;
1033   }
1034   // Create new property and add at the end of the list
1035   PropertyList_unique_add(&_system_properties, key, value);
1036   return true;
1037 }
1038 
1039 //===========================================================================================================
1040 // Setting int/mixed/comp mode flags
1041 
1042 void Arguments::set_mode_flags(Mode mode) {
1043   // Set up default values for all flags.
1044   // If you add a flag to any of the branches below,
1045   // add a default value for it here.
1046   set_java_compiler(false);
1047   _mode                      = mode;
1048 
1049   // Ensure Agent_OnLoad has the correct initial values.
1050   // This may not be the final mode; mode may change later in onload phase.
1051   PropertyList_unique_add(&_system_properties, "java.vm.info",
1052                           (char*)VM_Version::vm_info_string(), false);
1053 
1054   UseInterpreter             = true;
1055   UseCompiler                = true;
1056   UseLoopCounter             = true;
1057 
1058 #ifndef ZERO
1059   // Turn these off for mixed and comp.  Leave them on for Zero.
1060   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1061     UseFastAccessorMethods = (mode == _int);
1062   }
1063   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1064     UseFastEmptyMethods = (mode == _int);
1065   }
1066 #endif
1067 
1068   // Default values may be platform/compiler dependent -
1069   // use the saved values
1070   ClipInlining               = Arguments::_ClipInlining;
1071   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1072   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1073   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1074 
1075   // Change from defaults based on mode
1076   switch (mode) {
1077   default:
1078     ShouldNotReachHere();
1079     break;
1080   case _int:
1081     UseCompiler              = false;
1082     UseLoopCounter           = false;
1083     AlwaysCompileLoopMethods = false;
1084     UseOnStackReplacement    = false;
1085     break;
1086   case _mixed:
1087     // same as default
1088     break;
1089   case _comp:
1090     UseInterpreter           = false;
1091     BackgroundCompilation    = false;
1092     ClipInlining             = false;
1093     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1094     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1095     // compile a level 4 (C2) and then continue executing it.
1096     if (TieredCompilation) {
1097       Tier3InvokeNotifyFreqLog = 0;
1098       Tier4InvocationThreshold = 0;
1099     }
1100     break;
1101   }
1102 }
1103 
1104 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1105 // Conflict: required to use shared spaces (-Xshare:on), but
1106 // incompatible command line options were chosen.
1107 
1108 static void no_shared_spaces() {
1109   if (RequireSharedSpaces) {
1110     jio_fprintf(defaultStream::error_stream(),
1111       "Class data sharing is inconsistent with other specified options.\n");
1112     vm_exit_during_initialization("Unable to use shared archive.", NULL);
1113   } else {
1114     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1115   }
1116 }
1117 #endif
1118 
1119 void Arguments::set_tiered_flags() {
1120   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1121   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1122     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1123   }
1124   if (CompilationPolicyChoice < 2) {
1125     vm_exit_during_initialization(
1126       "Incompatible compilation policy selected", NULL);
1127   }
1128   // Increase the code cache size - tiered compiles a lot more.
1129   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1130     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1131   }
1132   if (!UseInterpreter) { // -Xcomp
1133     Tier3InvokeNotifyFreqLog = 0;
1134     Tier4InvocationThreshold = 0;
1135   }
1136 }
1137 
1138 #if INCLUDE_ALL_GCS
1139 static void disable_adaptive_size_policy(const char* collector_name) {
1140   if (UseAdaptiveSizePolicy) {
1141     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1142       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1143               collector_name);
1144     }
1145     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1146   }
1147 }
1148 
1149 void Arguments::set_parnew_gc_flags() {
1150   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1151          "control point invariant");
1152   assert(UseParNewGC, "Error");
1153 
1154   // Turn off AdaptiveSizePolicy for parnew until it is complete.
1155   disable_adaptive_size_policy("UseParNewGC");
1156 
1157   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1158     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1159     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1160   } else if (ParallelGCThreads == 0) {
1161     jio_fprintf(defaultStream::error_stream(),
1162         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1163     vm_exit(1);
1164   }
1165 
1166   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1167   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1168   // we set them to 1024 and 1024.
1169   // See CR 6362902.
1170   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1171     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1172   }
1173   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1174     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1175   }
1176 
1177   // AlwaysTenure flag should make ParNew promote all at first collection.
1178   // See CR 6362902.
1179   if (AlwaysTenure) {
1180     FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1181   }
1182   // When using compressed oops, we use local overflow stacks,
1183   // rather than using a global overflow list chained through
1184   // the klass word of the object's pre-image.
1185   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1186     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1187       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1188     }
1189     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1190   }
1191   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1192 }
1193 
1194 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1195 // sparc/solaris for certain applications, but would gain from
1196 // further optimization and tuning efforts, and would almost
1197 // certainly gain from analysis of platform and environment.
1198 void Arguments::set_cms_and_parnew_gc_flags() {
1199   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1200   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1201 
1202   // If we are using CMS, we prefer to UseParNewGC,
1203   // unless explicitly forbidden.
1204   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1205     FLAG_SET_ERGO(bool, UseParNewGC, true);
1206   }
1207 
1208   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1209   disable_adaptive_size_policy("UseConcMarkSweepGC");
1210 
1211   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1212   // as needed.
1213   if (UseParNewGC) {
1214     set_parnew_gc_flags();
1215   }
1216 
1217   size_t max_heap = align_size_down(MaxHeapSize,
1218                                     CardTableRS::ct_max_alignment_constraint());
1219 
1220   // Now make adjustments for CMS
1221   intx   tenuring_default = (intx)6;
1222   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1223 
1224   // Preferred young gen size for "short" pauses:
1225   // upper bound depends on # of threads and NewRatio.
1226   const uintx parallel_gc_threads =
1227     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1228   const size_t preferred_max_new_size_unaligned =
1229     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1230   size_t preferred_max_new_size =
1231     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1232 
1233   // Unless explicitly requested otherwise, size young gen
1234   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1235 
1236   // If either MaxNewSize or NewRatio is set on the command line,
1237   // assume the user is trying to set the size of the young gen.
1238   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1239 
1240     // Set MaxNewSize to our calculated preferred_max_new_size unless
1241     // NewSize was set on the command line and it is larger than
1242     // preferred_max_new_size.
1243     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1244       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1245     } else {
1246       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1247     }
1248     if (PrintGCDetails && Verbose) {
1249       // Too early to use gclog_or_tty
1250       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1251     }
1252 
1253     // Code along this path potentially sets NewSize and OldSize
1254     if (PrintGCDetails && Verbose) {
1255       // Too early to use gclog_or_tty
1256       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1257            " initial_heap_size:  " SIZE_FORMAT
1258            " max_heap: " SIZE_FORMAT,
1259            min_heap_size(), InitialHeapSize, max_heap);
1260     }
1261     size_t min_new = preferred_max_new_size;
1262     if (FLAG_IS_CMDLINE(NewSize)) {
1263       min_new = NewSize;
1264     }
1265     if (max_heap > min_new && min_heap_size() > min_new) {
1266       // Unless explicitly requested otherwise, make young gen
1267       // at least min_new, and at most preferred_max_new_size.
1268       if (FLAG_IS_DEFAULT(NewSize)) {
1269         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1270         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1271         if (PrintGCDetails && Verbose) {
1272           // Too early to use gclog_or_tty
1273           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1274         }
1275       }
1276       // Unless explicitly requested otherwise, size old gen
1277       // so it's NewRatio x of NewSize.
1278       if (FLAG_IS_DEFAULT(OldSize)) {
1279         if (max_heap > NewSize) {
1280           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1281           if (PrintGCDetails && Verbose) {
1282             // Too early to use gclog_or_tty
1283             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1284           }
1285         }
1286       }
1287     }
1288   }
1289   // Unless explicitly requested otherwise, definitely
1290   // promote all objects surviving "tenuring_default" scavenges.
1291   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1292       FLAG_IS_DEFAULT(SurvivorRatio)) {
1293     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1294   }
1295   // If we decided above (or user explicitly requested)
1296   // `promote all' (via MaxTenuringThreshold := 0),
1297   // prefer minuscule survivor spaces so as not to waste
1298   // space for (non-existent) survivors
1299   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1300     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1301   }
1302   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1303   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1304   // This is done in order to make ParNew+CMS configuration to work
1305   // with YoungPLABSize and OldPLABSize options.
1306   // See CR 6362902.
1307   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1308     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1309       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1310       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1311       // the value (either from the command line or ergonomics) of
1312       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1313       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1314     } else {
1315       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1316       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1317       // we'll let it to take precedence.
1318       jio_fprintf(defaultStream::error_stream(),
1319                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1320                   " options are specified for the CMS collector."
1321                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1322     }
1323   }
1324   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1325     // OldPLAB sizing manually turned off: Use a larger default setting,
1326     // unless it was manually specified. This is because a too-low value
1327     // will slow down scavenges.
1328     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1329       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1330     }
1331   }
1332   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1333   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1334   // If either of the static initialization defaults have changed, note this
1335   // modification.
1336   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1337     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1338   }
1339   if (PrintGCDetails && Verbose) {
1340     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1341       MarkStackSize / K, MarkStackSizeMax / K);
1342     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1343   }
1344 }
1345 #endif // INCLUDE_ALL_GCS
1346 
1347 void set_object_alignment() {
1348   // Object alignment.
1349   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1350   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1351   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1352   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1353   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1354   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1355 
1356   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1357   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1358 
1359   // Oop encoding heap max
1360   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1361 
1362 #if INCLUDE_ALL_GCS
1363   // Set CMS global values
1364   CompactibleFreeListSpace::set_cms_values();
1365 #endif // INCLUDE_ALL_GCS
1366 }
1367 
1368 bool verify_object_alignment() {
1369   // Object alignment.
1370   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1371     jio_fprintf(defaultStream::error_stream(),
1372                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1373                 (int)ObjectAlignmentInBytes);
1374     return false;
1375   }
1376   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1377     jio_fprintf(defaultStream::error_stream(),
1378                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1379                 (int)ObjectAlignmentInBytes, BytesPerLong);
1380     return false;
1381   }
1382   // It does not make sense to have big object alignment
1383   // since a space lost due to alignment will be greater
1384   // then a saved space from compressed oops.
1385   if ((int)ObjectAlignmentInBytes > 256) {
1386     jio_fprintf(defaultStream::error_stream(),
1387                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1388                 (int)ObjectAlignmentInBytes);
1389     return false;
1390   }
1391   // In case page size is very small.
1392   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1393     jio_fprintf(defaultStream::error_stream(),
1394                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1395                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1396     return false;
1397   }
1398   return true;
1399 }
1400 
1401 uintx Arguments::max_heap_for_compressed_oops() {
1402   // Avoid sign flip.
1403   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1404   // We need to fit both the NULL page and the heap into the memory budget, while
1405   // keeping alignment constraints of the heap. To guarantee the latter, as the
1406   // NULL page is located before the heap, we pad the NULL page to the conservative
1407   // maximum alignment that the GC may ever impose upon the heap.
1408   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1409                                                         _conservative_max_heap_alignment);
1410 
1411   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1412   NOT_LP64(ShouldNotReachHere(); return 0);
1413 }
1414 
1415 bool Arguments::should_auto_select_low_pause_collector() {
1416   if (UseAutoGCSelectPolicy &&
1417       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1418       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1419     if (PrintGCDetails) {
1420       // Cannot use gclog_or_tty yet.
1421       tty->print_cr("Automatic selection of the low pause collector"
1422        " based on pause goal of %d (ms)", MaxGCPauseMillis);
1423     }
1424     return true;
1425   }
1426   return false;
1427 }
1428 
1429 void Arguments::set_use_compressed_oops() {
1430 #ifndef ZERO
1431 #ifdef _LP64
1432   // MaxHeapSize is not set up properly at this point, but
1433   // the only value that can override MaxHeapSize if we are
1434   // to use UseCompressedOops is InitialHeapSize.
1435   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1436 
1437   if (max_heap_size <= max_heap_for_compressed_oops()) {
1438 #if !defined(COMPILER1) || defined(TIERED)
1439     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1440       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1441     }
1442 #endif
1443 #ifdef _WIN64
1444     if (UseLargePages && UseCompressedOops) {
1445       // Cannot allocate guard pages for implicit checks in indexed addressing
1446       // mode, when large pages are specified on windows.
1447       // This flag could be switched ON if narrow oop base address is set to 0,
1448       // see code in Universe::initialize_heap().
1449       Universe::set_narrow_oop_use_implicit_null_checks(false);
1450     }
1451 #endif //  _WIN64
1452   } else {
1453     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1454       warning("Max heap size too large for Compressed Oops");
1455       FLAG_SET_DEFAULT(UseCompressedOops, false);
1456       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1457     }
1458   }
1459 #endif // _LP64
1460 #endif // ZERO
1461 }
1462 
1463 
1464 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1465 // set_use_compressed_oops().
1466 void Arguments::set_use_compressed_klass_ptrs() {
1467 #ifndef ZERO
1468 #ifdef _LP64
1469   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1470   if (!UseCompressedOops) {
1471     if (UseCompressedClassPointers) {
1472       warning("UseCompressedClassPointers requires UseCompressedOops");
1473     }
1474     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1475   } else {
1476     // Turn on UseCompressedClassPointers too
1477     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1478       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1479     }
1480     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1481     if (UseCompressedClassPointers) {
1482       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1483         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1484         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1485       }
1486     }
1487   }
1488 #endif // _LP64
1489 #endif // !ZERO
1490 }
1491 
1492 void Arguments::set_conservative_max_heap_alignment() {
1493   // The conservative maximum required alignment for the heap is the maximum of
1494   // the alignments imposed by several sources: any requirements from the heap
1495   // itself, the collector policy and the maximum page size we may run the VM
1496   // with.
1497   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1498 #if INCLUDE_ALL_GCS
1499   if (UseParallelGC) {
1500     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1501   } else if (UseG1GC) {
1502     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1503   }
1504 #endif // INCLUDE_ALL_GCS
1505   _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1506     CollectorPolicy::compute_heap_alignment());
1507 }
1508 
1509 void Arguments::set_ergonomics_flags() {
1510 
1511   if (os::is_server_class_machine()) {
1512     // If no other collector is requested explicitly,
1513     // let the VM select the collector based on
1514     // machine class and automatic selection policy.
1515     if (!UseSerialGC &&
1516         !UseConcMarkSweepGC &&
1517         !UseG1GC &&
1518         !UseParNewGC &&
1519         FLAG_IS_DEFAULT(UseParallelGC)) {
1520       if (should_auto_select_low_pause_collector()) {
1521         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1522       } else {
1523         FLAG_SET_ERGO(bool, UseParallelGC, true);
1524       }
1525     }
1526   }
1527 #ifdef COMPILER2
1528   // Shared spaces work fine with other GCs but causes bytecode rewriting
1529   // to be disabled, which hurts interpreter performance and decreases
1530   // server performance.  When -server is specified, keep the default off
1531   // unless it is asked for.  Future work: either add bytecode rewriting
1532   // at link time, or rewrite bytecodes in non-shared methods.
1533   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1534       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1535     no_shared_spaces();
1536   }
1537 #endif
1538 
1539   set_conservative_max_heap_alignment();
1540 
1541 #ifndef ZERO
1542 #ifdef _LP64
1543   set_use_compressed_oops();
1544 
1545   // set_use_compressed_klass_ptrs() must be called after calling
1546   // set_use_compressed_oops().
1547   set_use_compressed_klass_ptrs();
1548 
1549   // Also checks that certain machines are slower with compressed oops
1550   // in vm_version initialization code.
1551 #endif // _LP64
1552 #endif // !ZERO
1553 }
1554 
1555 void Arguments::set_parallel_gc_flags() {
1556   assert(UseParallelGC || UseParallelOldGC, "Error");
1557   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1558   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1559     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1560   }
1561   FLAG_SET_DEFAULT(UseParallelGC, true);
1562 
1563   // If no heap maximum was requested explicitly, use some reasonable fraction
1564   // of the physical memory, up to a maximum of 1GB.
1565   FLAG_SET_DEFAULT(ParallelGCThreads,
1566                    Abstract_VM_Version::parallel_worker_threads());
1567   if (ParallelGCThreads == 0) {
1568     jio_fprintf(defaultStream::error_stream(),
1569         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1570     vm_exit(1);
1571   }
1572 
1573   if (UseAdaptiveSizePolicy) {
1574     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1575     // unless the user actually sets these flags.
1576     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1577       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1578     }
1579     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1580       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1581     }
1582   }
1583 
1584   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1585   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1586   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1587   // See CR 6362902 for details.
1588   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1589     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1590        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1591     }
1592     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1593       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1594     }
1595   }
1596 
1597   if (UseParallelOldGC) {
1598     // Par compact uses lower default values since they are treated as
1599     // minimums.  These are different defaults because of the different
1600     // interpretation and are not ergonomically set.
1601     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1602       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1603     }
1604   }
1605 }
1606 
1607 void Arguments::set_g1_gc_flags() {
1608   assert(UseG1GC, "Error");
1609 #ifdef COMPILER1
1610   FastTLABRefill = false;
1611 #endif
1612   FLAG_SET_DEFAULT(ParallelGCThreads,
1613                      Abstract_VM_Version::parallel_worker_threads());
1614   if (ParallelGCThreads == 0) {
1615     FLAG_SET_DEFAULT(ParallelGCThreads,
1616                      Abstract_VM_Version::parallel_worker_threads());
1617   }
1618 
1619   // MarkStackSize will be set (if it hasn't been set by the user)
1620   // when concurrent marking is initialized.
1621   // Its value will be based upon the number of parallel marking threads.
1622   // But we do set the maximum mark stack size here.
1623   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1624     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1625   }
1626 
1627   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1628     // In G1, we want the default GC overhead goal to be higher than
1629     // say in PS. So we set it here to 10%. Otherwise the heap might
1630     // be expanded more aggressively than we would like it to. In
1631     // fact, even 10% seems to not be high enough in some cases
1632     // (especially small GC stress tests that the main thing they do
1633     // is allocation). We might consider increase it further.
1634     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1635   }
1636 
1637   if (PrintGCDetails && Verbose) {
1638     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1639       MarkStackSize / K, MarkStackSizeMax / K);
1640     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1641   }
1642 }
1643 
1644 julong Arguments::limit_by_allocatable_memory(julong limit) {
1645   julong max_allocatable;
1646   julong result = limit;
1647   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1648     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1649   }
1650   return result;
1651 }
1652 
1653 void Arguments::set_heap_size() {
1654   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1655     // Deprecated flag
1656     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1657   }
1658 
1659   const julong phys_mem =
1660     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1661                             : (julong)MaxRAM;
1662 
1663   // If the maximum heap size has not been set with -Xmx,
1664   // then set it as fraction of the size of physical memory,
1665   // respecting the maximum and minimum sizes of the heap.
1666   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1667     julong reasonable_max = phys_mem / MaxRAMFraction;
1668 
1669     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1670       // Small physical memory, so use a minimum fraction of it for the heap
1671       reasonable_max = phys_mem / MinRAMFraction;
1672     } else {
1673       // Not-small physical memory, so require a heap at least
1674       // as large as MaxHeapSize
1675       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1676     }
1677     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1678       // Limit the heap size to ErgoHeapSizeLimit
1679       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1680     }
1681     if (UseCompressedOops) {
1682       // Limit the heap size to the maximum possible when using compressed oops
1683       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1684       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1685         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1686         // but it should be not less than default MaxHeapSize.
1687         max_coop_heap -= HeapBaseMinAddress;
1688       }
1689       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1690     }
1691     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1692 
1693     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1694       // An initial heap size was specified on the command line,
1695       // so be sure that the maximum size is consistent.  Done
1696       // after call to limit_by_allocatable_memory because that
1697       // method might reduce the allocation size.
1698       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1699     }
1700 
1701     if (PrintGCDetails && Verbose) {
1702       // Cannot use gclog_or_tty yet.
1703       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
1704     }
1705     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1706   }
1707 
1708   // If the minimum or initial heap_size have not been set or requested to be set
1709   // ergonomically, set them accordingly.
1710   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1711     julong reasonable_minimum = (julong)(OldSize + NewSize);
1712 
1713     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1714 
1715     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1716 
1717     if (InitialHeapSize == 0) {
1718       julong reasonable_initial = phys_mem / InitialRAMFraction;
1719 
1720       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1721       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1722 
1723       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1724 
1725       if (PrintGCDetails && Verbose) {
1726         // Cannot use gclog_or_tty yet.
1727         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1728       }
1729       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1730     }
1731     // If the minimum heap size has not been set (via -Xms),
1732     // synchronize with InitialHeapSize to avoid errors with the default value.
1733     if (min_heap_size() == 0) {
1734       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1735       if (PrintGCDetails && Verbose) {
1736         // Cannot use gclog_or_tty yet.
1737         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1738       }
1739     }
1740   }
1741 }
1742 
1743 // This must be called after ergonomics because we want bytecode rewriting
1744 // if the server compiler is used, or if UseSharedSpaces is disabled.
1745 void Arguments::set_bytecode_flags() {
1746   // Better not attempt to store into a read-only space.
1747   if (UseSharedSpaces) {
1748     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1749     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1750   }
1751 
1752   if (!RewriteBytecodes) {
1753     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1754   }
1755 }
1756 
1757 // Aggressive optimization flags  -XX:+AggressiveOpts
1758 void Arguments::set_aggressive_opts_flags() {
1759 #ifdef COMPILER2
1760   if (AggressiveUnboxing) {
1761     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1762       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1763     } else if (!EliminateAutoBox) {
1764       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1765       AggressiveUnboxing = false;
1766     }
1767     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1768       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1769     } else if (!DoEscapeAnalysis) {
1770       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1771       AggressiveUnboxing = false;
1772     }
1773   }
1774   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1775     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1776       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1777     }
1778     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1779       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1780     }
1781 
1782     // Feed the cache size setting into the JDK
1783     char buffer[1024];
1784     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1785     add_property(buffer);
1786   }
1787   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1788     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1789   }
1790 #endif
1791 
1792   if (AggressiveOpts) {
1793 // Sample flag setting code
1794 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1795 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1796 //    }
1797   }
1798 }
1799 
1800 //===========================================================================================================
1801 // Parsing of java.compiler property
1802 
1803 void Arguments::process_java_compiler_argument(char* arg) {
1804   // For backwards compatibility, Djava.compiler=NONE or ""
1805   // causes us to switch to -Xint mode UNLESS -Xdebug
1806   // is also specified.
1807   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1808     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1809   }
1810 }
1811 
1812 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1813   _sun_java_launcher = strdup(launcher);
1814   if (strcmp("gamma", _sun_java_launcher) == 0) {
1815     _created_by_gamma_launcher = true;
1816   }
1817 }
1818 
1819 bool Arguments::created_by_java_launcher() {
1820   assert(_sun_java_launcher != NULL, "property must have value");
1821   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1822 }
1823 
1824 bool Arguments::created_by_gamma_launcher() {
1825   return _created_by_gamma_launcher;
1826 }
1827 
1828 //===========================================================================================================
1829 // Parsing of main arguments
1830 
1831 bool Arguments::verify_interval(uintx val, uintx min,
1832                                 uintx max, const char* name) {
1833   // Returns true iff value is in the inclusive interval [min..max]
1834   // false, otherwise.
1835   if (val >= min && val <= max) {
1836     return true;
1837   }
1838   jio_fprintf(defaultStream::error_stream(),
1839               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1840               " and " UINTX_FORMAT "\n",
1841               name, val, min, max);
1842   return false;
1843 }
1844 
1845 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1846   // Returns true if given value is at least specified min threshold
1847   // false, otherwise.
1848   if (val >= min ) {
1849       return true;
1850   }
1851   jio_fprintf(defaultStream::error_stream(),
1852               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1853               name, val, min);
1854   return false;
1855 }
1856 
1857 bool Arguments::verify_percentage(uintx value, const char* name) {
1858   if (is_percentage(value)) {
1859     return true;
1860   }
1861   jio_fprintf(defaultStream::error_stream(),
1862               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1863               name, value);
1864   return false;
1865 }
1866 
1867 #if !INCLUDE_ALL_GCS
1868 #ifdef ASSERT
1869 static bool verify_serial_gc_flags() {
1870   return (UseSerialGC &&
1871         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1872           UseParallelGC || UseParallelOldGC));
1873 }
1874 #endif // ASSERT
1875 #endif // INCLUDE_ALL_GCS
1876 
1877 // check if do gclog rotation
1878 // +UseGCLogFileRotation is a must,
1879 // no gc log rotation when log file not supplied or
1880 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1881 void check_gclog_consistency() {
1882   if (UseGCLogFileRotation) {
1883     if ((Arguments::gc_log_filename() == NULL) ||
1884         (NumberOfGCLogFiles == 0)  ||
1885         (GCLogFileSize == 0)) {
1886       jio_fprintf(defaultStream::output_stream(),
1887                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n"
1888                   "where num_of_file > 0 and num_of_size > 0\n"
1889                   "GC log rotation is turned off\n");
1890       UseGCLogFileRotation = false;
1891     }
1892   }
1893 
1894   if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1895         FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1896         jio_fprintf(defaultStream::output_stream(),
1897                     "GCLogFileSize changed to minimum 8K\n");
1898   }
1899 }
1900 
1901 // This function is called for -Xloggc:<filename>, it can be used
1902 // to check if a given file name(or string) conforms to the following
1903 // specification:
1904 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1905 // %p and %t only allowed once. We only limit usage of filename not path
1906 bool is_filename_valid(const char *file_name) {
1907   const char* p = file_name;
1908   char file_sep = os::file_separator()[0];
1909   const char* cp;
1910   // skip prefix path
1911   for (cp = file_name; *cp != '\0'; cp++) {
1912     if (*cp == '/' || *cp == file_sep) {
1913       p = cp + 1;
1914     }
1915   }
1916 
1917   int count_p = 0;
1918   int count_t = 0;
1919   while (*p != '\0') {
1920     if ((*p >= '0' && *p <= '9') ||
1921         (*p >= 'A' && *p <= 'Z') ||
1922         (*p >= 'a' && *p <= 'z') ||
1923          *p == '-'               ||
1924          *p == '_'               ||
1925          *p == '.') {
1926        p++;
1927        continue;
1928     }
1929     if (*p == '%') {
1930       if(*(p + 1) == 'p') {
1931         p += 2;
1932         count_p ++;
1933         continue;
1934       }
1935       if (*(p + 1) == 't') {
1936         p += 2;
1937         count_t ++;
1938         continue;
1939       }
1940     }
1941     return false;
1942   }
1943   return count_p < 2 && count_t < 2;
1944 }
1945 
1946 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1947   if (!is_percentage(min_heap_free_ratio)) {
1948     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1949     return false;
1950   }
1951   if (min_heap_free_ratio > MaxHeapFreeRatio) {
1952     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1953                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1954                   MaxHeapFreeRatio);
1955     return false;
1956   }
1957   return true;
1958 }
1959 
1960 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1961   if (!is_percentage(max_heap_free_ratio)) {
1962     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1963     return false;
1964   }
1965   if (max_heap_free_ratio < MinHeapFreeRatio) {
1966     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1967                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1968                   MinHeapFreeRatio);
1969     return false;
1970   }
1971   return true;
1972 }
1973 
1974 // Check consistency of GC selection
1975 bool Arguments::check_gc_consistency() {
1976   check_gclog_consistency();
1977   bool status = true;
1978   // Ensure that the user has not selected conflicting sets
1979   // of collectors. [Note: this check is merely a user convenience;
1980   // collectors over-ride each other so that only a non-conflicting
1981   // set is selected; however what the user gets is not what they
1982   // may have expected from the combination they asked for. It's
1983   // better to reduce user confusion by not allowing them to
1984   // select conflicting combinations.
1985   uint i = 0;
1986   if (UseSerialGC)                       i++;
1987   if (UseConcMarkSweepGC || UseParNewGC) i++;
1988   if (UseParallelGC || UseParallelOldGC) i++;
1989   if (UseG1GC)                           i++;
1990   if (i > 1) {
1991     jio_fprintf(defaultStream::error_stream(),
1992                 "Conflicting collector combinations in option list; "
1993                 "please refer to the release notes for the combinations "
1994                 "allowed\n");
1995     status = false;
1996   }
1997   return status;
1998 }
1999 
2000 void Arguments::check_deprecated_gcs() {
2001   if (UseConcMarkSweepGC && !UseParNewGC) {
2002     warning("Using the DefNew young collector with the CMS collector is deprecated "
2003         "and will likely be removed in a future release");
2004   }
2005 
2006   if (UseParNewGC && !UseConcMarkSweepGC) {
2007     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2008     // set up UseSerialGC properly, so that can't be used in the check here.
2009     warning("Using the ParNew young collector with the Serial old collector is deprecated "
2010         "and will likely be removed in a future release");
2011   }
2012 
2013   if (CMSIncrementalMode) {
2014     warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2015   }
2016 }
2017 
2018 void Arguments::check_deprecated_gc_flags() {
2019   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2020     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2021             "and will likely be removed in future release");
2022   }
2023   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2024     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2025         "Use MaxRAMFraction instead.");
2026   }
2027   if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2028     warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2029   }
2030   if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2031     warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2032   }
2033   if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2034     warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2035   }
2036 }
2037 
2038 // Check stack pages settings
2039 bool Arguments::check_stack_pages()
2040 {
2041   bool status = true;
2042   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2043   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2044   // greater stack shadow pages can't generate instruction to bang stack
2045   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2046   return status;
2047 }
2048 
2049 // Check the consistency of vm_init_args
2050 bool Arguments::check_vm_args_consistency() {
2051   // Method for adding checks for flag consistency.
2052   // The intent is to warn the user of all possible conflicts,
2053   // before returning an error.
2054   // Note: Needs platform-dependent factoring.
2055   bool status = true;
2056 
2057   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2058   // builds so the cost of stack banging can be measured.
2059 #if (defined(PRODUCT) && defined(SOLARIS))
2060   if (!UseBoundThreads && !UseStackBanging) {
2061     jio_fprintf(defaultStream::error_stream(),
2062                 "-UseStackBanging conflicts with -UseBoundThreads\n");
2063 
2064      status = false;
2065   }
2066 #endif
2067 
2068   if (TLABRefillWasteFraction == 0) {
2069     jio_fprintf(defaultStream::error_stream(),
2070                 "TLABRefillWasteFraction should be a denominator, "
2071                 "not " SIZE_FORMAT "\n",
2072                 TLABRefillWasteFraction);
2073     status = false;
2074   }
2075 
2076   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2077                               "AdaptiveSizePolicyWeight");
2078   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2079 
2080   // Divide by bucket size to prevent a large size from causing rollover when
2081   // calculating amount of memory needed to be allocated for the String table.
2082   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2083     (max_uintx / StringTable::bucket_size()), "StringTable size");
2084 
2085   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2086     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2087 
2088   {
2089     // Using "else if" below to avoid printing two error messages if min > max.
2090     // This will also prevent us from reporting both min>100 and max>100 at the
2091     // same time, but that is less annoying than printing two identical errors IMHO.
2092     FormatBuffer<80> err_msg("");
2093     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2094       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2095       status = false;
2096     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2097       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2098       status = false;
2099     }
2100   }
2101 
2102   // Min/MaxMetaspaceFreeRatio
2103   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2104   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2105 
2106   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2107     jio_fprintf(defaultStream::error_stream(),
2108                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2109                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2110                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2111                 MinMetaspaceFreeRatio,
2112                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2113                 MaxMetaspaceFreeRatio);
2114     status = false;
2115   }
2116 
2117   // Trying to keep 100% free is not practical
2118   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2119 
2120   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2121     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2122   }
2123 
2124   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2125     // Settings to encourage splitting.
2126     if (!FLAG_IS_CMDLINE(NewRatio)) {
2127       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2128     }
2129     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2130       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2131     }
2132   }
2133 
2134   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2135   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2136   if (GCTimeLimit == 100) {
2137     // Turn off gc-overhead-limit-exceeded checks
2138     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2139   }
2140 
2141   status = status && check_gc_consistency();
2142   status = status && check_stack_pages();
2143 
2144   if (CMSIncrementalMode) {
2145     if (!UseConcMarkSweepGC) {
2146       jio_fprintf(defaultStream::error_stream(),
2147                   "error:  invalid argument combination.\n"
2148                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2149                   "selected in order\nto use CMSIncrementalMode.\n");
2150       status = false;
2151     } else {
2152       status = status && verify_percentage(CMSIncrementalDutyCycle,
2153                                   "CMSIncrementalDutyCycle");
2154       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2155                                   "CMSIncrementalDutyCycleMin");
2156       status = status && verify_percentage(CMSIncrementalSafetyFactor,
2157                                   "CMSIncrementalSafetyFactor");
2158       status = status && verify_percentage(CMSIncrementalOffset,
2159                                   "CMSIncrementalOffset");
2160       status = status && verify_percentage(CMSExpAvgFactor,
2161                                   "CMSExpAvgFactor");
2162       // If it was not set on the command line, set
2163       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2164       if (CMSInitiatingOccupancyFraction < 0) {
2165         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2166       }
2167     }
2168   }
2169 
2170   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2171   // insists that we hold the requisite locks so that the iteration is
2172   // MT-safe. For the verification at start-up and shut-down, we don't
2173   // yet have a good way of acquiring and releasing these locks,
2174   // which are not visible at the CollectedHeap level. We want to
2175   // be able to acquire these locks and then do the iteration rather
2176   // than just disable the lock verification. This will be fixed under
2177   // bug 4788986.
2178   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2179     if (VerifyDuringStartup) {
2180       warning("Heap verification at start-up disabled "
2181               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2182       VerifyDuringStartup = false; // Disable verification at start-up
2183     }
2184 
2185     if (VerifyBeforeExit) {
2186       warning("Heap verification at shutdown disabled "
2187               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2188       VerifyBeforeExit = false; // Disable verification at shutdown
2189     }
2190   }
2191 
2192   // Note: only executed in non-PRODUCT mode
2193   if (!UseAsyncConcMarkSweepGC &&
2194       (ExplicitGCInvokesConcurrent ||
2195        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2196     jio_fprintf(defaultStream::error_stream(),
2197                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2198                 " with -UseAsyncConcMarkSweepGC");
2199     status = false;
2200   }
2201 
2202   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2203 
2204 #if INCLUDE_ALL_GCS
2205   if (UseG1GC) {
2206     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2207     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2208     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2209 
2210     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2211                                          "InitiatingHeapOccupancyPercent");
2212     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2213                                         "G1RefProcDrainInterval");
2214     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2215                                         "G1ConcMarkStepDurationMillis");
2216     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2217                                        "G1ConcRSHotCardLimit");
2218     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2219                                        "G1ConcRSLogCacheSize");
2220     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2221                                        "StringDeduplicationAgeThreshold");
2222   }
2223   if (UseConcMarkSweepGC) {
2224     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2225     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2226     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2227     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2228 
2229     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2230 
2231     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2232     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2233     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2234 
2235     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2236 
2237     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2238     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2239 
2240     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2241     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2242     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2243 
2244     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2245 
2246     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2247 
2248     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2249     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2250     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2251     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2252     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2253   }
2254 
2255   if (UseParallelGC || UseParallelOldGC) {
2256     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2257     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2258 
2259     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2260     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2261 
2262     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2263     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2264 
2265     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2266 
2267     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2268   }
2269 #endif // INCLUDE_ALL_GCS
2270 
2271   status = status && verify_interval(RefDiscoveryPolicy,
2272                                      ReferenceProcessor::DiscoveryPolicyMin,
2273                                      ReferenceProcessor::DiscoveryPolicyMax,
2274                                      "RefDiscoveryPolicy");
2275 
2276   // Limit the lower bound of this flag to 1 as it is used in a division
2277   // expression.
2278   status = status && verify_interval(TLABWasteTargetPercent,
2279                                      1, 100, "TLABWasteTargetPercent");
2280 
2281   status = status && verify_object_alignment();
2282 
2283   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2284                                       "CompressedClassSpaceSize");
2285 
2286   status = status && verify_interval(MarkStackSizeMax,
2287                                   1, (max_jint - 1), "MarkStackSizeMax");
2288   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2289 
2290   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2291 
2292   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2293 
2294   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2295 
2296   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2297   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2298 
2299   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2300 
2301   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2302   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2303   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2304   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2305 
2306   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2307   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2308 
2309   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2310   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2311   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2312 
2313   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2314   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2315 
2316   // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2317   // just for that, so hardcode here.
2318   status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2319   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2320   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2321   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2322 
2323   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2324 
2325   if (PrintNMTStatistics) {
2326 #if INCLUDE_NMT
2327     if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2328 #endif // INCLUDE_NMT
2329       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2330       PrintNMTStatistics = false;
2331 #if INCLUDE_NMT
2332     }
2333 #endif
2334   }
2335 
2336   // Need to limit the extent of the padding to reasonable size.
2337   // 8K is well beyond the reasonable HW cache line size, even with the
2338   // aggressive prefetching, while still leaving the room for segregating
2339   // among the distinct pages.
2340   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2341     jio_fprintf(defaultStream::error_stream(),
2342                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2343                 ContendedPaddingWidth, 0, 8192);
2344     status = false;
2345   }
2346 
2347   // Need to enforce the padding not to break the existing field alignments.
2348   // It is sufficient to check against the largest type size.
2349   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2350     jio_fprintf(defaultStream::error_stream(),
2351                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2352                 ContendedPaddingWidth, BytesPerLong);
2353     status = false;
2354   }
2355 
2356   // Check lower bounds of the code cache
2357   // Template Interpreter code is approximately 3X larger in debug builds.
2358   uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2359   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2360     jio_fprintf(defaultStream::error_stream(),
2361                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2362                 os::vm_page_size()/K);
2363     status = false;
2364   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2365     jio_fprintf(defaultStream::error_stream(),
2366                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2367                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2368     status = false;
2369   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2370     jio_fprintf(defaultStream::error_stream(),
2371                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2372                 min_code_cache_size/K);
2373     status = false;
2374   } else if (ReservedCodeCacheSize > 2*G) {
2375     // Code cache size larger than MAXINT is not supported.
2376     jio_fprintf(defaultStream::error_stream(),
2377                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2378                 (2*G)/M);
2379     status = false;
2380   }
2381 
2382   status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2383   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2384 
2385   return status;
2386 }
2387 
2388 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2389   const char* option_type) {
2390   if (ignore) return false;
2391 
2392   const char* spacer = " ";
2393   if (option_type == NULL) {
2394     option_type = ++spacer; // Set both to the empty string.
2395   }
2396 
2397   if (os::obsolete_option(option)) {
2398     jio_fprintf(defaultStream::error_stream(),
2399                 "Obsolete %s%soption: %s\n", option_type, spacer,
2400       option->optionString);
2401     return false;
2402   } else {
2403     jio_fprintf(defaultStream::error_stream(),
2404                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2405       option->optionString);
2406     return true;
2407   }
2408 }
2409 
2410 static const char* user_assertion_options[] = {
2411   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2412 };
2413 
2414 static const char* system_assertion_options[] = {
2415   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2416 };
2417 
2418 // Return true if any of the strings in null-terminated array 'names' matches.
2419 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2420 // the option must match exactly.
2421 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2422   bool tail_allowed) {
2423   for (/* empty */; *names != NULL; ++names) {
2424     if (match_option(option, *names, tail)) {
2425       if (**tail == '\0' || tail_allowed && **tail == ':') {
2426         return true;
2427       }
2428     }
2429   }
2430   return false;
2431 }
2432 
2433 bool Arguments::parse_uintx(const char* value,
2434                             uintx* uintx_arg,
2435                             uintx min_size) {
2436 
2437   // Check the sign first since atomull() parses only unsigned values.
2438   bool value_is_positive = !(*value == '-');
2439 
2440   if (value_is_positive) {
2441     julong n;
2442     bool good_return = atomull(value, &n);
2443     if (good_return) {
2444       bool above_minimum = n >= min_size;
2445       bool value_is_too_large = n > max_uintx;
2446 
2447       if (above_minimum && !value_is_too_large) {
2448         *uintx_arg = n;
2449         return true;
2450       }
2451     }
2452   }
2453   return false;
2454 }
2455 
2456 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2457                                                   julong* long_arg,
2458                                                   julong min_size) {
2459   if (!atomull(s, long_arg)) return arg_unreadable;
2460   return check_memory_size(*long_arg, min_size);
2461 }
2462 
2463 // Parse JavaVMInitArgs structure
2464 
2465 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2466   // For components of the system classpath.
2467   SysClassPath scp(Arguments::get_sysclasspath());
2468   bool scp_assembly_required = false;
2469 
2470   // Save default settings for some mode flags
2471   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2472   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2473   Arguments::_ClipInlining             = ClipInlining;
2474   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2475 
2476   // Setup flags for mixed which is the default
2477   set_mode_flags(_mixed);
2478 
2479   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2480   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2481   if (result != JNI_OK) {
2482     return result;
2483   }
2484 
2485   // Parse JavaVMInitArgs structure passed in
2486   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2487   if (result != JNI_OK) {
2488     return result;
2489   }
2490 
2491   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2492   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2493   if (result != JNI_OK) {
2494     return result;
2495   }
2496 
2497   // Do final processing now that all arguments have been parsed
2498   result = finalize_vm_init_args(&scp, scp_assembly_required);
2499   if (result != JNI_OK) {
2500     return result;
2501   }
2502 
2503   return JNI_OK;
2504 }
2505 
2506 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2507 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2508 // are dealing with -agentpath (case where name is a path), otherwise with
2509 // -agentlib
2510 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2511   char *_name;
2512   const char *_hprof = "hprof", *_jdwp = "jdwp";
2513   size_t _len_hprof, _len_jdwp, _len_prefix;
2514 
2515   if (is_path) {
2516     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2517       return false;
2518     }
2519 
2520     _name++;  // skip past last path separator
2521     _len_prefix = strlen(JNI_LIB_PREFIX);
2522 
2523     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2524       return false;
2525     }
2526 
2527     _name += _len_prefix;
2528     _len_hprof = strlen(_hprof);
2529     _len_jdwp = strlen(_jdwp);
2530 
2531     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2532       _name += _len_hprof;
2533     }
2534     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2535       _name += _len_jdwp;
2536     }
2537     else {
2538       return false;
2539     }
2540 
2541     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2542       return false;
2543     }
2544 
2545     return true;
2546   }
2547 
2548   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2549     return true;
2550   }
2551 
2552   return false;
2553 }
2554 
2555 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2556                                        SysClassPath* scp_p,
2557                                        bool* scp_assembly_required_p,
2558                                        Flag::Flags origin) {
2559   // Remaining part of option string
2560   const char* tail;
2561 
2562   // iterate over arguments
2563   for (int index = 0; index < args->nOptions; index++) {
2564     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2565 
2566     const JavaVMOption* option = args->options + index;
2567 
2568     if (!match_option(option, "-Djava.class.path", &tail) &&
2569         !match_option(option, "-Dsun.java.command", &tail) &&
2570         !match_option(option, "-Dsun.java.launcher", &tail)) {
2571 
2572         // add all jvm options to the jvm_args string. This string
2573         // is used later to set the java.vm.args PerfData string constant.
2574         // the -Djava.class.path and the -Dsun.java.command options are
2575         // omitted from jvm_args string as each have their own PerfData
2576         // string constant object.
2577         build_jvm_args(option->optionString);
2578     }
2579 
2580     // -verbose:[class/gc/jni]
2581     if (match_option(option, "-verbose", &tail)) {
2582       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2583         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2584         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2585       } else if (!strcmp(tail, ":gc")) {
2586         FLAG_SET_CMDLINE(bool, PrintGC, true);
2587       } else if (!strcmp(tail, ":jni")) {
2588         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2589       }
2590     // -da / -ea / -disableassertions / -enableassertions
2591     // These accept an optional class/package name separated by a colon, e.g.,
2592     // -da:java.lang.Thread.
2593     } else if (match_option(option, user_assertion_options, &tail, true)) {
2594       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2595       if (*tail == '\0') {
2596         JavaAssertions::setUserClassDefault(enable);
2597       } else {
2598         assert(*tail == ':', "bogus match by match_option()");
2599         JavaAssertions::addOption(tail + 1, enable);
2600       }
2601     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2602     } else if (match_option(option, system_assertion_options, &tail, false)) {
2603       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2604       JavaAssertions::setSystemClassDefault(enable);
2605     // -bootclasspath:
2606     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2607       scp_p->reset_path(tail);
2608       *scp_assembly_required_p = true;
2609     // -bootclasspath/a:
2610     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2611       scp_p->add_suffix(tail);
2612       *scp_assembly_required_p = true;
2613     // -bootclasspath/p:
2614     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2615       scp_p->add_prefix(tail);
2616       *scp_assembly_required_p = true;
2617     // -Xrun
2618     } else if (match_option(option, "-Xrun", &tail)) {
2619       if (tail != NULL) {
2620         const char* pos = strchr(tail, ':');
2621         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2622         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2623         name[len] = '\0';
2624 
2625         char *options = NULL;
2626         if(pos != NULL) {
2627           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2628           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2629         }
2630 #if !INCLUDE_JVMTI
2631         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2632           jio_fprintf(defaultStream::error_stream(),
2633             "Profiling and debugging agents are not supported in this VM\n");
2634           return JNI_ERR;
2635         }
2636 #endif // !INCLUDE_JVMTI
2637         add_init_library(name, options);
2638       }
2639     // -agentlib and -agentpath
2640     } else if (match_option(option, "-agentlib:", &tail) ||
2641           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2642       if(tail != NULL) {
2643         const char* pos = strchr(tail, '=');
2644         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2645         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2646         name[len] = '\0';
2647 
2648         char *options = NULL;
2649         if(pos != NULL) {
2650           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2651         }
2652 #if !INCLUDE_JVMTI
2653         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2654           jio_fprintf(defaultStream::error_stream(),
2655             "Profiling and debugging agents are not supported in this VM\n");
2656           return JNI_ERR;
2657         }
2658 #endif // !INCLUDE_JVMTI
2659         add_init_agent(name, options, is_absolute_path);
2660       }
2661     // -javaagent
2662     } else if (match_option(option, "-javaagent:", &tail)) {
2663 #if !INCLUDE_JVMTI
2664       jio_fprintf(defaultStream::error_stream(),
2665         "Instrumentation agents are not supported in this VM\n");
2666       return JNI_ERR;
2667 #else
2668       if(tail != NULL) {
2669         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2670         add_init_agent("instrument", options, false);
2671       }
2672 #endif // !INCLUDE_JVMTI
2673     // -Xnoclassgc
2674     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2675       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2676     // -Xincgc: i-CMS
2677     } else if (match_option(option, "-Xincgc", &tail)) {
2678       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2679       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2680     // -Xnoincgc: no i-CMS
2681     } else if (match_option(option, "-Xnoincgc", &tail)) {
2682       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2683       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2684     // -Xconcgc
2685     } else if (match_option(option, "-Xconcgc", &tail)) {
2686       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2687     // -Xnoconcgc
2688     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2689       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2690     // -Xbatch
2691     } else if (match_option(option, "-Xbatch", &tail)) {
2692       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2693     // -Xmn for compatibility with other JVM vendors
2694     } else if (match_option(option, "-Xmn", &tail)) {
2695       julong long_initial_young_size = 0;
2696       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2697       if (errcode != arg_in_range) {
2698         jio_fprintf(defaultStream::error_stream(),
2699                     "Invalid initial young generation size: %s\n", option->optionString);
2700         describe_range_error(errcode);
2701         return JNI_EINVAL;
2702       }
2703       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2704       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2705     // -Xms
2706     } else if (match_option(option, "-Xms", &tail)) {
2707       julong long_initial_heap_size = 0;
2708       // an initial heap size of 0 means automatically determine
2709       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2710       if (errcode != arg_in_range) {
2711         jio_fprintf(defaultStream::error_stream(),
2712                     "Invalid initial heap size: %s\n", option->optionString);
2713         describe_range_error(errcode);
2714         return JNI_EINVAL;
2715       }
2716       set_min_heap_size((uintx)long_initial_heap_size);
2717       // Currently the minimum size and the initial heap sizes are the same.
2718       // Can be overridden with -XX:InitialHeapSize.
2719       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2720     // -Xmx
2721     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2722       julong long_max_heap_size = 0;
2723       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2724       if (errcode != arg_in_range) {
2725         jio_fprintf(defaultStream::error_stream(),
2726                     "Invalid maximum heap size: %s\n", option->optionString);
2727         describe_range_error(errcode);
2728         return JNI_EINVAL;
2729       }
2730       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2731     // Xmaxf
2732     } else if (match_option(option, "-Xmaxf", &tail)) {
2733       char* err;
2734       int maxf = (int)(strtod(tail, &err) * 100);
2735       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2736         jio_fprintf(defaultStream::error_stream(),
2737                     "Bad max heap free percentage size: %s\n",
2738                     option->optionString);
2739         return JNI_EINVAL;
2740       } else {
2741         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2742       }
2743     // Xminf
2744     } else if (match_option(option, "-Xminf", &tail)) {
2745       char* err;
2746       int minf = (int)(strtod(tail, &err) * 100);
2747       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2748         jio_fprintf(defaultStream::error_stream(),
2749                     "Bad min heap free percentage size: %s\n",
2750                     option->optionString);
2751         return JNI_EINVAL;
2752       } else {
2753         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2754       }
2755     // -Xss
2756     } else if (match_option(option, "-Xss", &tail)) {
2757       julong long_ThreadStackSize = 0;
2758       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2759       if (errcode != arg_in_range) {
2760         jio_fprintf(defaultStream::error_stream(),
2761                     "Invalid thread stack size: %s\n", option->optionString);
2762         describe_range_error(errcode);
2763         return JNI_EINVAL;
2764       }
2765       // Internally track ThreadStackSize in units of 1024 bytes.
2766       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2767                               round_to((int)long_ThreadStackSize, K) / K);
2768     // -Xoss
2769     } else if (match_option(option, "-Xoss", &tail)) {
2770           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2771     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2772       julong long_CodeCacheExpansionSize = 0;
2773       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2774       if (errcode != arg_in_range) {
2775         jio_fprintf(defaultStream::error_stream(),
2776                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2777                    os::vm_page_size()/K);
2778         return JNI_EINVAL;
2779       }
2780       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2781     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2782                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2783       julong long_ReservedCodeCacheSize = 0;
2784 
2785       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2786       if (errcode != arg_in_range) {
2787         jio_fprintf(defaultStream::error_stream(),
2788                     "Invalid maximum code cache size: %s.\n", option->optionString);
2789         return JNI_EINVAL;
2790       }
2791       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2792       //-XX:IncreaseFirstTierCompileThresholdAt=
2793       } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2794         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2795         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2796           jio_fprintf(defaultStream::error_stream(),
2797                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2798                       option->optionString);
2799           return JNI_EINVAL;
2800         }
2801         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2802     // -green
2803     } else if (match_option(option, "-green", &tail)) {
2804       jio_fprintf(defaultStream::error_stream(),
2805                   "Green threads support not available\n");
2806           return JNI_EINVAL;
2807     // -native
2808     } else if (match_option(option, "-native", &tail)) {
2809           // HotSpot always uses native threads, ignore silently for compatibility
2810     // -Xsqnopause
2811     } else if (match_option(option, "-Xsqnopause", &tail)) {
2812           // EVM option, ignore silently for compatibility
2813     // -Xrs
2814     } else if (match_option(option, "-Xrs", &tail)) {
2815           // Classic/EVM option, new functionality
2816       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2817     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2818           // change default internal VM signals used - lower case for back compat
2819       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2820     // -Xoptimize
2821     } else if (match_option(option, "-Xoptimize", &tail)) {
2822           // EVM option, ignore silently for compatibility
2823     // -Xprof
2824     } else if (match_option(option, "-Xprof", &tail)) {
2825 #if INCLUDE_FPROF
2826       _has_profile = true;
2827 #else // INCLUDE_FPROF
2828       jio_fprintf(defaultStream::error_stream(),
2829         "Flat profiling is not supported in this VM.\n");
2830       return JNI_ERR;
2831 #endif // INCLUDE_FPROF
2832     // -Xconcurrentio
2833     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2834       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2835       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2836       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2837       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2838       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2839 
2840       // -Xinternalversion
2841     } else if (match_option(option, "-Xinternalversion", &tail)) {
2842       jio_fprintf(defaultStream::output_stream(), "%s\n",
2843                   VM_Version::internal_vm_info_string());
2844       vm_exit(0);
2845 #ifndef PRODUCT
2846     // -Xprintflags
2847     } else if (match_option(option, "-Xprintflags", &tail)) {
2848       CommandLineFlags::printFlags(tty, false);
2849       vm_exit(0);
2850 #endif
2851     // -D
2852     } else if (match_option(option, "-D", &tail)) {
2853       if (!add_property(tail)) {
2854         return JNI_ENOMEM;
2855       }
2856       // Out of the box management support
2857       if (match_option(option, "-Dcom.sun.management", &tail)) {
2858 #if INCLUDE_MANAGEMENT
2859         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2860 #else
2861         jio_fprintf(defaultStream::output_stream(),
2862           "-Dcom.sun.management is not supported in this VM.\n");
2863         return JNI_ERR;
2864 #endif
2865       }
2866     // -Xint
2867     } else if (match_option(option, "-Xint", &tail)) {
2868           set_mode_flags(_int);
2869     // -Xmixed
2870     } else if (match_option(option, "-Xmixed", &tail)) {
2871           set_mode_flags(_mixed);
2872     // -Xcomp
2873     } else if (match_option(option, "-Xcomp", &tail)) {
2874       // for testing the compiler; turn off all flags that inhibit compilation
2875           set_mode_flags(_comp);
2876     // -Xshare:dump
2877     } else if (match_option(option, "-Xshare:dump", &tail)) {
2878       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2879       set_mode_flags(_int);     // Prevent compilation, which creates objects
2880     // -Xshare:on
2881     } else if (match_option(option, "-Xshare:on", &tail)) {
2882       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2883       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2884     // -Xshare:auto
2885     } else if (match_option(option, "-Xshare:auto", &tail)) {
2886       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2887       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2888     // -Xshare:off
2889     } else if (match_option(option, "-Xshare:off", &tail)) {
2890       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2891       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2892     // -Xverify
2893     } else if (match_option(option, "-Xverify", &tail)) {
2894       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2895         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2896         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2897       } else if (strcmp(tail, ":remote") == 0) {
2898         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2899         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2900       } else if (strcmp(tail, ":none") == 0) {
2901         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2902         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2903       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2904         return JNI_EINVAL;
2905       }
2906     // -Xdebug
2907     } else if (match_option(option, "-Xdebug", &tail)) {
2908       // note this flag has been used, then ignore
2909       set_xdebug_mode(true);
2910     // -Xnoagent
2911     } else if (match_option(option, "-Xnoagent", &tail)) {
2912       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2913     } else if (match_option(option, "-Xboundthreads", &tail)) {
2914       // Bind user level threads to kernel threads (Solaris only)
2915       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2916     } else if (match_option(option, "-Xloggc:", &tail)) {
2917       // Redirect GC output to the file. -Xloggc:<filename>
2918       // ostream_init_log(), when called will use this filename
2919       // to initialize a fileStream.
2920       _gc_log_filename = strdup(tail);
2921      if (!is_filename_valid(_gc_log_filename)) {
2922        jio_fprintf(defaultStream::output_stream(),
2923                   "Invalid file name for use with -Xloggc: Filename can only contain the "
2924                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2925                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
2926         return JNI_EINVAL;
2927       }
2928       FLAG_SET_CMDLINE(bool, PrintGC, true);
2929       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2930 
2931     // JNI hooks
2932     } else if (match_option(option, "-Xcheck", &tail)) {
2933       if (!strcmp(tail, ":jni")) {
2934 #if !INCLUDE_JNI_CHECK
2935         warning("JNI CHECKING is not supported in this VM");
2936 #else
2937         CheckJNICalls = true;
2938 #endif // INCLUDE_JNI_CHECK
2939       } else if (is_bad_option(option, args->ignoreUnrecognized,
2940                                      "check")) {
2941         return JNI_EINVAL;
2942       }
2943     } else if (match_option(option, "vfprintf", &tail)) {
2944       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2945     } else if (match_option(option, "exit", &tail)) {
2946       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2947     } else if (match_option(option, "abort", &tail)) {
2948       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2949     // -XX:+AggressiveHeap
2950     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2951 
2952       // This option inspects the machine and attempts to set various
2953       // parameters to be optimal for long-running, memory allocation
2954       // intensive jobs.  It is intended for machines with large
2955       // amounts of cpu and memory.
2956 
2957       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2958       // VM, but we may not be able to represent the total physical memory
2959       // available (like having 8gb of memory on a box but using a 32bit VM).
2960       // Thus, we need to make sure we're using a julong for intermediate
2961       // calculations.
2962       julong initHeapSize;
2963       julong total_memory = os::physical_memory();
2964 
2965       if (total_memory < (julong)256*M) {
2966         jio_fprintf(defaultStream::error_stream(),
2967                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2968         vm_exit(1);
2969       }
2970 
2971       // The heap size is half of available memory, or (at most)
2972       // all of possible memory less 160mb (leaving room for the OS
2973       // when using ISM).  This is the maximum; because adaptive sizing
2974       // is turned on below, the actual space used may be smaller.
2975 
2976       initHeapSize = MIN2(total_memory / (julong)2,
2977                           total_memory - (julong)160*M);
2978 
2979       initHeapSize = limit_by_allocatable_memory(initHeapSize);
2980 
2981       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2982          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2983          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2984          // Currently the minimum size and the initial heap sizes are the same.
2985          set_min_heap_size(initHeapSize);
2986       }
2987       if (FLAG_IS_DEFAULT(NewSize)) {
2988          // Make the young generation 3/8ths of the total heap.
2989          FLAG_SET_CMDLINE(uintx, NewSize,
2990                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2991          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2992       }
2993 
2994 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
2995       FLAG_SET_DEFAULT(UseLargePages, true);
2996 #endif
2997 
2998       // Increase some data structure sizes for efficiency
2999       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3000       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3001       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3002 
3003       // See the OldPLABSize comment below, but replace 'after promotion'
3004       // with 'after copying'.  YoungPLABSize is the size of the survivor
3005       // space per-gc-thread buffers.  The default is 4kw.
3006       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
3007 
3008       // OldPLABSize is the size of the buffers in the old gen that
3009       // UseParallelGC uses to promote live data that doesn't fit in the
3010       // survivor spaces.  At any given time, there's one for each gc thread.
3011       // The default size is 1kw. These buffers are rarely used, since the
3012       // survivor spaces are usually big enough.  For specjbb, however, there
3013       // are occasions when there's lots of live data in the young gen
3014       // and we end up promoting some of it.  We don't have a definite
3015       // explanation for why bumping OldPLABSize helps, but the theory
3016       // is that a bigger PLAB results in retaining something like the
3017       // original allocation order after promotion, which improves mutator
3018       // locality.  A minor effect may be that larger PLABs reduce the
3019       // number of PLAB allocation events during gc.  The value of 8kw
3020       // was arrived at by experimenting with specjbb.
3021       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
3022 
3023       // Enable parallel GC and adaptive generation sizing
3024       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3025       FLAG_SET_DEFAULT(ParallelGCThreads,
3026                        Abstract_VM_Version::parallel_worker_threads());
3027 
3028       // Encourage steady state memory management
3029       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3030 
3031       // This appears to improve mutator locality
3032       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3033 
3034       // Get around early Solaris scheduling bug
3035       // (affinity vs other jobs on system)
3036       // but disallow DR and offlining (5008695).
3037       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3038 
3039     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3040       // The last option must always win.
3041       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3042       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3043     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3044       // The last option must always win.
3045       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3046       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3047     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3048                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3049       jio_fprintf(defaultStream::error_stream(),
3050         "Please use CMSClassUnloadingEnabled in place of "
3051         "CMSPermGenSweepingEnabled in the future\n");
3052     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3053       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3054       jio_fprintf(defaultStream::error_stream(),
3055         "Please use -XX:+UseGCOverheadLimit in place of "
3056         "-XX:+UseGCTimeLimit in the future\n");
3057     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3058       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3059       jio_fprintf(defaultStream::error_stream(),
3060         "Please use -XX:-UseGCOverheadLimit in place of "
3061         "-XX:-UseGCTimeLimit in the future\n");
3062     // The TLE options are for compatibility with 1.3 and will be
3063     // removed without notice in a future release.  These options
3064     // are not to be documented.
3065     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3066       // No longer used.
3067     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3068       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3069     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3070       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3071     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3072       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3073     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3074       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3075     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3076       // No longer used.
3077     } else if (match_option(option, "-XX:TLESize=", &tail)) {
3078       julong long_tlab_size = 0;
3079       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3080       if (errcode != arg_in_range) {
3081         jio_fprintf(defaultStream::error_stream(),
3082                     "Invalid TLAB size: %s\n", option->optionString);
3083         describe_range_error(errcode);
3084         return JNI_EINVAL;
3085       }
3086       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3087     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3088       // No longer used.
3089     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3090       FLAG_SET_CMDLINE(bool, UseTLAB, true);
3091     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3092       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3093     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3094       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3095       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3096     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3097       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3098       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3099     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3100 #if defined(DTRACE_ENABLED)
3101       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3102       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3103       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3104       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3105 #else // defined(DTRACE_ENABLED)
3106       jio_fprintf(defaultStream::error_stream(),
3107                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3108       return JNI_EINVAL;
3109 #endif // defined(DTRACE_ENABLED)
3110 #ifdef ASSERT
3111     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3112       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3113       // disable scavenge before parallel mark-compact
3114       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3115 #endif
3116     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3117       julong cms_blocks_to_claim = (julong)atol(tail);
3118       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3119       jio_fprintf(defaultStream::error_stream(),
3120         "Please use -XX:OldPLABSize in place of "
3121         "-XX:CMSParPromoteBlocksToClaim in the future\n");
3122     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3123       julong cms_blocks_to_claim = (julong)atol(tail);
3124       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3125       jio_fprintf(defaultStream::error_stream(),
3126         "Please use -XX:OldPLABSize in place of "
3127         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3128     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3129       julong old_plab_size = 0;
3130       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3131       if (errcode != arg_in_range) {
3132         jio_fprintf(defaultStream::error_stream(),
3133                     "Invalid old PLAB size: %s\n", option->optionString);
3134         describe_range_error(errcode);
3135         return JNI_EINVAL;
3136       }
3137       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3138       jio_fprintf(defaultStream::error_stream(),
3139                   "Please use -XX:OldPLABSize in place of "
3140                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3141     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3142       julong young_plab_size = 0;
3143       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3144       if (errcode != arg_in_range) {
3145         jio_fprintf(defaultStream::error_stream(),
3146                     "Invalid young PLAB size: %s\n", option->optionString);
3147         describe_range_error(errcode);
3148         return JNI_EINVAL;
3149       }
3150       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3151       jio_fprintf(defaultStream::error_stream(),
3152                   "Please use -XX:YoungPLABSize in place of "
3153                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3154     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3155                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3156       julong stack_size = 0;
3157       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3158       if (errcode != arg_in_range) {
3159         jio_fprintf(defaultStream::error_stream(),
3160                     "Invalid mark stack size: %s\n", option->optionString);
3161         describe_range_error(errcode);
3162         return JNI_EINVAL;
3163       }
3164       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3165     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3166       julong max_stack_size = 0;
3167       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3168       if (errcode != arg_in_range) {
3169         jio_fprintf(defaultStream::error_stream(),
3170                     "Invalid maximum mark stack size: %s\n",
3171                     option->optionString);
3172         describe_range_error(errcode);
3173         return JNI_EINVAL;
3174       }
3175       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3176     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3177                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3178       uintx conc_threads = 0;
3179       if (!parse_uintx(tail, &conc_threads, 1)) {
3180         jio_fprintf(defaultStream::error_stream(),
3181                     "Invalid concurrent threads: %s\n", option->optionString);
3182         return JNI_EINVAL;
3183       }
3184       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3185     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3186       julong max_direct_memory_size = 0;
3187       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3188       if (errcode != arg_in_range) {
3189         jio_fprintf(defaultStream::error_stream(),
3190                     "Invalid maximum direct memory size: %s\n",
3191                     option->optionString);
3192         describe_range_error(errcode);
3193         return JNI_EINVAL;
3194       }
3195       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3196     } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3197       // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3198       //       away and will cause VM initialization failures!
3199       warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3200       FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3201 #if !INCLUDE_MANAGEMENT
3202     } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3203         jio_fprintf(defaultStream::error_stream(),
3204           "ManagementServer is not supported in this VM.\n");
3205         return JNI_ERR;
3206 #endif // INCLUDE_MANAGEMENT
3207     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3208       // Skip -XX:Flags= since that case has already been handled
3209       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3210         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3211           return JNI_EINVAL;
3212         }
3213       }
3214     // Unknown option
3215     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3216       return JNI_ERR;
3217     }
3218   }
3219 
3220   // Change the default value for flags  which have different default values
3221   // when working with older JDKs.
3222 #ifdef LINUX
3223  if (JDK_Version::current().compare_major(6) <= 0 &&
3224       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3225     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3226   }
3227 #endif // LINUX
3228   return JNI_OK;
3229 }
3230 
3231 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3232   // This must be done after all -D arguments have been processed.
3233   scp_p->expand_endorsed();
3234 
3235   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3236     // Assemble the bootclasspath elements into the final path.
3237     Arguments::set_sysclasspath(scp_p->combined_path());
3238   }
3239 
3240   // This must be done after all arguments have been processed.
3241   // java_compiler() true means set to "NONE" or empty.
3242   if (java_compiler() && !xdebug_mode()) {
3243     // For backwards compatibility, we switch to interpreted mode if
3244     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3245     // not specified.
3246     set_mode_flags(_int);
3247   }
3248   if (CompileThreshold == 0) {
3249     set_mode_flags(_int);
3250   }
3251 
3252   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3253   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3254     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3255   }
3256 
3257 #ifndef COMPILER2
3258   // Don't degrade server performance for footprint
3259   if (FLAG_IS_DEFAULT(UseLargePages) &&
3260       MaxHeapSize < LargePageHeapSizeThreshold) {
3261     // No need for large granularity pages w/small heaps.
3262     // Note that large pages are enabled/disabled for both the
3263     // Java heap and the code cache.
3264     FLAG_SET_DEFAULT(UseLargePages, false);
3265   }
3266 
3267 #else
3268   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3269     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3270   }
3271 #endif
3272 
3273 #ifndef TIERED
3274   // Tiered compilation is undefined.
3275   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3276 #endif
3277 
3278   // If we are running in a headless jre, force java.awt.headless property
3279   // to be true unless the property has already been set.
3280   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3281   if (os::is_headless_jre()) {
3282     const char* headless = Arguments::get_property("java.awt.headless");
3283     if (headless == NULL) {
3284       char envbuffer[128];
3285       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3286         if (!add_property("java.awt.headless=true")) {
3287           return JNI_ENOMEM;
3288         }
3289       } else {
3290         char buffer[256];
3291         strcpy(buffer, "java.awt.headless=");
3292         strcat(buffer, envbuffer);
3293         if (!add_property(buffer)) {
3294           return JNI_ENOMEM;
3295         }
3296       }
3297     }
3298   }
3299 
3300   if (!check_vm_args_consistency()) {
3301     return JNI_ERR;
3302   }
3303 
3304   return JNI_OK;
3305 }
3306 
3307 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3308   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3309                                             scp_assembly_required_p);
3310 }
3311 
3312 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3313   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3314                                             scp_assembly_required_p);
3315 }
3316 
3317 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3318   const int N_MAX_OPTIONS = 64;
3319   const int OPTION_BUFFER_SIZE = 1024;
3320   char buffer[OPTION_BUFFER_SIZE];
3321 
3322   // The variable will be ignored if it exceeds the length of the buffer.
3323   // Don't check this variable if user has special privileges
3324   // (e.g. unix su command).
3325   if (os::getenv(name, buffer, sizeof(buffer)) &&
3326       !os::have_special_privileges()) {
3327     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3328     jio_fprintf(defaultStream::error_stream(),
3329                 "Picked up %s: %s\n", name, buffer);
3330     char* rd = buffer;                        // pointer to the input string (rd)
3331     int i;
3332     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3333       while (isspace(*rd)) rd++;              // skip whitespace
3334       if (*rd == 0) break;                    // we re done when the input string is read completely
3335 
3336       // The output, option string, overwrites the input string.
3337       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3338       // input string (rd).
3339       char* wrt = rd;
3340 
3341       options[i++].optionString = wrt;        // Fill in option
3342       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3343         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3344           int quote = *rd;                    // matching quote to look for
3345           rd++;                               // don't copy open quote
3346           while (*rd != quote) {              // include everything (even spaces) up until quote
3347             if (*rd == 0) {                   // string termination means unmatched string
3348               jio_fprintf(defaultStream::error_stream(),
3349                           "Unmatched quote in %s\n", name);
3350               return JNI_ERR;
3351             }
3352             *wrt++ = *rd++;                   // copy to option string
3353           }
3354           rd++;                               // don't copy close quote
3355         } else {
3356           *wrt++ = *rd++;                     // copy to option string
3357         }
3358       }
3359       // Need to check if we're done before writing a NULL,
3360       // because the write could be to the byte that rd is pointing to.
3361       if (*rd++ == 0) {
3362         *wrt = 0;
3363         break;
3364       }
3365       *wrt = 0;                               // Zero terminate option
3366     }
3367     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3368     JavaVMInitArgs vm_args;
3369     vm_args.version = JNI_VERSION_1_2;
3370     vm_args.options = options;
3371     vm_args.nOptions = i;
3372     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3373 
3374     if (PrintVMOptions) {
3375       const char* tail;
3376       for (int i = 0; i < vm_args.nOptions; i++) {
3377         const JavaVMOption *option = vm_args.options + i;
3378         if (match_option(option, "-XX:", &tail)) {
3379           logOption(tail);
3380         }
3381       }
3382     }
3383 
3384     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3385   }
3386   return JNI_OK;
3387 }
3388 
3389 void Arguments::set_shared_spaces_flags() {
3390   if (DumpSharedSpaces) {
3391     if (RequireSharedSpaces) {
3392       warning("cannot dump shared archive while using shared archive");
3393     }
3394     UseSharedSpaces = false;
3395 #ifdef _LP64
3396     if (!UseCompressedOops || !UseCompressedClassPointers) {
3397       vm_exit_during_initialization(
3398         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3399     }
3400   } else {
3401     // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3402     if (!UseCompressedOops || !UseCompressedClassPointers) {
3403       no_shared_spaces();
3404     }
3405 #endif
3406   }
3407 }
3408 
3409 #if !INCLUDE_ALL_GCS
3410 static void force_serial_gc() {
3411   FLAG_SET_DEFAULT(UseSerialGC, true);
3412   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
3413   UNSUPPORTED_GC_OPTION(UseG1GC);
3414   UNSUPPORTED_GC_OPTION(UseParallelGC);
3415   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3416   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3417   UNSUPPORTED_GC_OPTION(UseParNewGC);
3418 }
3419 #endif // INCLUDE_ALL_GCS
3420 
3421 // Sharing support
3422 // Construct the path to the archive
3423 static char* get_shared_archive_path() {
3424   char *shared_archive_path;
3425   if (SharedArchiveFile == NULL) {
3426     char jvm_path[JVM_MAXPATHLEN];
3427     os::jvm_path(jvm_path, sizeof(jvm_path));
3428     char *end = strrchr(jvm_path, *os::file_separator());
3429     if (end != NULL) *end = '\0';
3430     size_t jvm_path_len = strlen(jvm_path);
3431     size_t file_sep_len = strlen(os::file_separator());
3432     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3433         file_sep_len + 20, mtInternal);
3434     if (shared_archive_path != NULL) {
3435       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3436       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3437       strncat(shared_archive_path, "classes.jsa", 11);
3438     }
3439   } else {
3440     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3441     if (shared_archive_path != NULL) {
3442       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3443     }
3444   }
3445   return shared_archive_path;
3446 }
3447 
3448 #ifndef PRODUCT
3449 // Determine whether LogVMOutput should be implicitly turned on.
3450 static bool use_vm_log() {
3451   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3452       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3453       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3454       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3455       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3456     return true;
3457   }
3458 
3459 #ifdef COMPILER1
3460   if (PrintC1Statistics) {
3461     return true;
3462   }
3463 #endif // COMPILER1
3464 
3465 #ifdef COMPILER2
3466   if (PrintOptoAssembly || PrintOptoStatistics) {
3467     return true;
3468   }
3469 #endif // COMPILER2
3470 
3471   return false;
3472 }
3473 #endif // PRODUCT
3474 
3475 // Parse entry point called from JNI_CreateJavaVM
3476 
3477 jint Arguments::parse(const JavaVMInitArgs* args) {
3478 
3479   // Remaining part of option string
3480   const char* tail;
3481 
3482   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3483   const char* hotspotrc = ".hotspotrc";
3484   bool settings_file_specified = false;
3485   bool needs_hotspotrc_warning = false;
3486 
3487   const char* flags_file;
3488   int index;
3489   for (index = 0; index < args->nOptions; index++) {
3490     const JavaVMOption *option = args->options + index;
3491     if (match_option(option, "-XX:Flags=", &tail)) {
3492       flags_file = tail;
3493       settings_file_specified = true;
3494     }
3495     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3496       PrintVMOptions = true;
3497     }
3498     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3499       PrintVMOptions = false;
3500     }
3501     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3502       IgnoreUnrecognizedVMOptions = true;
3503     }
3504     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3505       IgnoreUnrecognizedVMOptions = false;
3506     }
3507     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3508       CommandLineFlags::printFlags(tty, false);
3509       vm_exit(0);
3510     }
3511     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3512 #if INCLUDE_NMT
3513       MemTracker::init_tracking_options(tail);
3514 #else
3515       jio_fprintf(defaultStream::error_stream(),
3516         "Native Memory Tracking is not supported in this VM\n");
3517       return JNI_ERR;
3518 #endif
3519     }
3520 
3521 
3522 #ifndef PRODUCT
3523     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3524       CommandLineFlags::printFlags(tty, true);
3525       vm_exit(0);
3526     }
3527 #endif
3528   }
3529 
3530   if (IgnoreUnrecognizedVMOptions) {
3531     // uncast const to modify the flag args->ignoreUnrecognized
3532     *(jboolean*)(&args->ignoreUnrecognized) = true;
3533   }
3534 
3535   // Parse specified settings file
3536   if (settings_file_specified) {
3537     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3538       return JNI_EINVAL;
3539     }
3540   } else {
3541 #ifdef ASSERT
3542     // Parse default .hotspotrc settings file
3543     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3544       return JNI_EINVAL;
3545     }
3546 #else
3547     struct stat buf;
3548     if (os::stat(hotspotrc, &buf) == 0) {
3549       needs_hotspotrc_warning = true;
3550     }
3551 #endif
3552   }
3553 
3554   if (PrintVMOptions) {
3555     for (index = 0; index < args->nOptions; index++) {
3556       const JavaVMOption *option = args->options + index;
3557       if (match_option(option, "-XX:", &tail)) {
3558         logOption(tail);
3559       }
3560     }
3561   }
3562 
3563   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3564   jint result = parse_vm_init_args(args);
3565   if (result != JNI_OK) {
3566     return result;
3567   }
3568 
3569   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3570   SharedArchivePath = get_shared_archive_path();
3571   if (SharedArchivePath == NULL) {
3572     return JNI_ENOMEM;
3573   }
3574 
3575   // Delay warning until here so that we've had a chance to process
3576   // the -XX:-PrintWarnings flag
3577   if (needs_hotspotrc_warning) {
3578     warning("%s file is present but has been ignored.  "
3579             "Run with -XX:Flags=%s to load the file.",
3580             hotspotrc, hotspotrc);
3581   }
3582 
3583 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3584   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3585 #endif
3586 
3587 #if INCLUDE_ALL_GCS
3588   #if (defined JAVASE_EMBEDDED || defined ARM)
3589     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3590   #endif
3591 #endif
3592 
3593 #ifndef PRODUCT
3594   if (TraceBytecodesAt != 0) {
3595     TraceBytecodes = true;
3596   }
3597   if (CountCompiledCalls) {
3598     if (UseCounterDecay) {
3599       warning("UseCounterDecay disabled because CountCalls is set");
3600       UseCounterDecay = false;
3601     }
3602   }
3603 #endif // PRODUCT
3604 
3605   // JSR 292 is not supported before 1.7
3606   if (!JDK_Version::is_gte_jdk17x_version()) {
3607     if (EnableInvokeDynamic) {
3608       if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3609         warning("JSR 292 is not supported before 1.7.  Disabling support.");
3610       }
3611       EnableInvokeDynamic = false;
3612     }
3613   }
3614 
3615   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3616     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3617       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3618     }
3619     ScavengeRootsInCode = 1;
3620   }
3621 
3622   if (PrintGCDetails) {
3623     // Turn on -verbose:gc options as well
3624     PrintGC = true;
3625   }
3626 
3627   if (!JDK_Version::is_gte_jdk18x_version()) {
3628     // To avoid changing the log format for 7 updates this flag is only
3629     // true by default in JDK8 and above.
3630     if (FLAG_IS_DEFAULT(PrintGCCause)) {
3631       FLAG_SET_DEFAULT(PrintGCCause, false);
3632     }
3633   }
3634 
3635   // Set object alignment values.
3636   set_object_alignment();
3637 
3638 #if !INCLUDE_ALL_GCS
3639   force_serial_gc();
3640 #endif // INCLUDE_ALL_GCS
3641 #if !INCLUDE_CDS
3642   if (DumpSharedSpaces || RequireSharedSpaces) {
3643     jio_fprintf(defaultStream::error_stream(),
3644       "Shared spaces are not supported in this VM\n");
3645     return JNI_ERR;
3646   }
3647   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3648     warning("Shared spaces are not supported in this VM");
3649     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3650     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3651   }
3652   no_shared_spaces();
3653 #endif // INCLUDE_CDS
3654 
3655   return JNI_OK;
3656 }
3657 
3658 jint Arguments::apply_ergo() {
3659 
3660   // Set flags based on ergonomics.
3661   set_ergonomics_flags();
3662 
3663   set_shared_spaces_flags();
3664 
3665   // Check the GC selections again.
3666   if (!check_gc_consistency()) {
3667     return JNI_EINVAL;
3668   }
3669 
3670   if (TieredCompilation) {
3671     set_tiered_flags();
3672   } else {
3673     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3674     if (CompilationPolicyChoice >= 2) {
3675       vm_exit_during_initialization(
3676         "Incompatible compilation policy selected", NULL);
3677     }
3678   }
3679   // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3680   if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3681     FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3682   }
3683 
3684 
3685   // Set heap size based on available physical memory
3686   set_heap_size();
3687 
3688 #if INCLUDE_ALL_GCS
3689   // Set per-collector flags
3690   if (UseParallelGC || UseParallelOldGC) {
3691     set_parallel_gc_flags();
3692   } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3693     set_cms_and_parnew_gc_flags();
3694   } else if (UseParNewGC) {  // Skipped if CMS is set above
3695     set_parnew_gc_flags();
3696   } else if (UseG1GC) {
3697     set_g1_gc_flags();
3698   }
3699   check_deprecated_gcs();
3700   check_deprecated_gc_flags();
3701   if (AssumeMP && !UseSerialGC) {
3702     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3703       warning("If the number of processors is expected to increase from one, then"
3704               " you should configure the number of parallel GC threads appropriately"
3705               " using -XX:ParallelGCThreads=N");
3706     }
3707   }
3708   if (MinHeapFreeRatio == 100) {
3709     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3710     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3711   }
3712 #else // INCLUDE_ALL_GCS
3713   assert(verify_serial_gc_flags(), "SerialGC unset");
3714 #endif // INCLUDE_ALL_GCS
3715 
3716   // Initialize Metaspace flags and alignments.
3717   Metaspace::ergo_initialize();
3718 
3719   // Set bytecode rewriting flags
3720   set_bytecode_flags();
3721 
3722   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3723   set_aggressive_opts_flags();
3724 
3725   // Turn off biased locking for locking debug mode flags,
3726   // which are subtlely different from each other but neither works with
3727   // biased locking.
3728   if (UseHeavyMonitors
3729 #ifdef COMPILER1
3730       || !UseFastLocking
3731 #endif // COMPILER1
3732     ) {
3733     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3734       // flag set to true on command line; warn the user that they
3735       // can't enable biased locking here
3736       warning("Biased Locking is not supported with locking debug flags"
3737               "; ignoring UseBiasedLocking flag." );
3738     }
3739     UseBiasedLocking = false;
3740   }
3741 
3742 #ifdef CC_INTERP
3743   // Clear flags not supported by the C++ interpreter
3744   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3745   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3746   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3747   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3748 #endif // CC_INTERP
3749 
3750 #ifdef COMPILER2
3751   if (!EliminateLocks) {
3752     EliminateNestedLocks = false;
3753   }
3754   if (!Inline) {
3755     IncrementalInline = false;
3756   }
3757 #ifndef PRODUCT
3758   if (!IncrementalInline) {
3759     AlwaysIncrementalInline = false;
3760   }
3761 #endif
3762   if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3763     // incremental inlining: bump MaxNodeLimit
3764     FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3765   }
3766   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3767     // nothing to use the profiling, turn if off
3768     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3769   }
3770   if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3771     // Doing the replace in parent maps helps speculation
3772     FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3773   }
3774 #endif
3775 
3776   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3777     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3778     DebugNonSafepoints = true;
3779   }
3780 
3781   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3782     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3783   }
3784 
3785 #ifndef PRODUCT
3786   if (CompileTheWorld) {
3787     // Force NmethodSweeper to sweep whole CodeCache each time.
3788     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3789       NmethodSweepFraction = 1;
3790     }
3791   }
3792 
3793   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3794     if (use_vm_log()) {
3795       LogVMOutput = true;
3796     }
3797   }
3798 #endif // PRODUCT
3799 
3800   if (PrintCommandLineFlags) {
3801     CommandLineFlags::printSetFlags(tty);
3802   }
3803 
3804   // Apply CPU specific policy for the BiasedLocking
3805   if (UseBiasedLocking) {
3806     if (!VM_Version::use_biased_locking() &&
3807         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3808       UseBiasedLocking = false;
3809     }
3810   }
3811 
3812   // set PauseAtExit if the gamma launcher was used and a debugger is attached
3813   // but only if not already set on the commandline
3814   if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3815     bool set = false;
3816     CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3817     if (!set) {
3818       FLAG_SET_DEFAULT(PauseAtExit, true);
3819     }
3820   }
3821 #ifdef COMPILER2
3822   if (!UseBiasedLocking || EmitSync != 0) {
3823     UseOptoBiasInlining = false;
3824   }
3825 #endif
3826 
3827   return JNI_OK;
3828 }
3829 
3830 jint Arguments::adjust_after_os() {
3831 #if INCLUDE_ALL_GCS
3832   if (UseParallelGC || UseParallelOldGC) {
3833     if (UseNUMA) {
3834       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3835         FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3836       }
3837       // For those collectors or operating systems (eg, Windows) that do
3838       // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3839       UseNUMAInterleaving = true;
3840     }
3841   }
3842 #endif // INCLUDE_ALL_GCS
3843   return JNI_OK;
3844 }
3845 
3846 int Arguments::PropertyList_count(SystemProperty* pl) {
3847   int count = 0;
3848   while(pl != NULL) {
3849     count++;
3850     pl = pl->next();
3851   }
3852   return count;
3853 }
3854 
3855 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3856   assert(key != NULL, "just checking");
3857   SystemProperty* prop;
3858   for (prop = pl; prop != NULL; prop = prop->next()) {
3859     if (strcmp(key, prop->key()) == 0) return prop->value();
3860   }
3861   return NULL;
3862 }
3863 
3864 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3865   int count = 0;
3866   const char* ret_val = NULL;
3867 
3868   while(pl != NULL) {
3869     if(count >= index) {
3870       ret_val = pl->key();
3871       break;
3872     }
3873     count++;
3874     pl = pl->next();
3875   }
3876 
3877   return ret_val;
3878 }
3879 
3880 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3881   int count = 0;
3882   char* ret_val = NULL;
3883 
3884   while(pl != NULL) {
3885     if(count >= index) {
3886       ret_val = pl->value();
3887       break;
3888     }
3889     count++;
3890     pl = pl->next();
3891   }
3892 
3893   return ret_val;
3894 }
3895 
3896 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3897   SystemProperty* p = *plist;
3898   if (p == NULL) {
3899     *plist = new_p;
3900   } else {
3901     while (p->next() != NULL) {
3902       p = p->next();
3903     }
3904     p->set_next(new_p);
3905   }
3906 }
3907 
3908 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3909   if (plist == NULL)
3910     return;
3911 
3912   SystemProperty* new_p = new SystemProperty(k, v, true);
3913   PropertyList_add(plist, new_p);
3914 }
3915 
3916 // This add maintains unique property key in the list.
3917 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3918   if (plist == NULL)
3919     return;
3920 
3921   // If property key exist then update with new value.
3922   SystemProperty* prop;
3923   for (prop = *plist; prop != NULL; prop = prop->next()) {
3924     if (strcmp(k, prop->key()) == 0) {
3925       if (append) {
3926         prop->append_value(v);
3927       } else {
3928         prop->set_value(v);
3929       }
3930       return;
3931     }
3932   }
3933 
3934   PropertyList_add(plist, k, v);
3935 }
3936 
3937 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3938 // Returns true if all of the source pointed by src has been copied over to
3939 // the destination buffer pointed by buf. Otherwise, returns false.
3940 // Notes:
3941 // 1. If the length (buflen) of the destination buffer excluding the
3942 // NULL terminator character is not long enough for holding the expanded
3943 // pid characters, it also returns false instead of returning the partially
3944 // expanded one.
3945 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3946 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3947                                 char* buf, size_t buflen) {
3948   const char* p = src;
3949   char* b = buf;
3950   const char* src_end = &src[srclen];
3951   char* buf_end = &buf[buflen - 1];
3952 
3953   while (p < src_end && b < buf_end) {
3954     if (*p == '%') {
3955       switch (*(++p)) {
3956       case '%':         // "%%" ==> "%"
3957         *b++ = *p++;
3958         break;
3959       case 'p':  {       //  "%p" ==> current process id
3960         // buf_end points to the character before the last character so
3961         // that we could write '\0' to the end of the buffer.
3962         size_t buf_sz = buf_end - b + 1;
3963         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3964 
3965         // if jio_snprintf fails or the buffer is not long enough to hold
3966         // the expanded pid, returns false.
3967         if (ret < 0 || ret >= (int)buf_sz) {
3968           return false;
3969         } else {
3970           b += ret;
3971           assert(*b == '\0', "fail in copy_expand_pid");
3972           if (p == src_end && b == buf_end + 1) {
3973             // reach the end of the buffer.
3974             return true;
3975           }
3976         }
3977         p++;
3978         break;
3979       }
3980       default :
3981         *b++ = '%';
3982       }
3983     } else {
3984       *b++ = *p++;
3985     }
3986   }
3987   *b = '\0';
3988   return (p == src_end); // return false if not all of the source was copied
3989 }