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 #ifdef PRODUCT
 294   { "DesiredMethodLimit",
 295                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 296 #endif // PRODUCT
 297   { NULL, JDK_Version(0), JDK_Version(0) }
 298 };
 299 
 300 // Returns true if the flag is obsolete and fits into the range specified
 301 // for being ignored.  In the case that the flag is ignored, the 'version'
 302 // value is filled in with the version number when the flag became
 303 // obsolete so that that value can be displayed to the user.
 304 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 305   int i = 0;
 306   assert(version != NULL, "Must provide a version buffer");
 307   while (obsolete_jvm_flags[i].name != NULL) {
 308     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 309     // <flag>=xxx form
 310     // [-|+]<flag> form
 311     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 312         ((s[0] == '+' || s[0] == '-') &&
 313         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 314       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 315           *version = flag_status.obsoleted_in;
 316           return true;
 317       }
 318     }
 319     i++;
 320   }
 321   return false;
 322 }
 323 
 324 // Constructs the system class path (aka boot class path) from the following
 325 // components, in order:
 326 //
 327 //     prefix           // from -Xbootclasspath/p:...
 328 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 329 //     base             // from os::get_system_properties() or -Xbootclasspath=
 330 //     suffix           // from -Xbootclasspath/a:...
 331 //
 332 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 333 // directories are added to the sysclasspath just before the base.
 334 //
 335 // This could be AllStatic, but it isn't needed after argument processing is
 336 // complete.
 337 class SysClassPath: public StackObj {
 338 public:
 339   SysClassPath(const char* base);
 340   ~SysClassPath();
 341 
 342   inline void set_base(const char* base);
 343   inline void add_prefix(const char* prefix);
 344   inline void add_suffix_to_prefix(const char* suffix);
 345   inline void add_suffix(const char* suffix);
 346   inline void reset_path(const char* base);
 347 
 348   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 349   // property.  Must be called after all command-line arguments have been
 350   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 351   // combined_path().
 352   void expand_endorsed();
 353 
 354   inline const char* get_base()     const { return _items[_scp_base]; }
 355   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 356   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 357   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 358 
 359   // Combine all the components into a single c-heap-allocated string; caller
 360   // must free the string if/when no longer needed.
 361   char* combined_path();
 362 
 363 private:
 364   // Utility routines.
 365   static char* add_to_path(const char* path, const char* str, bool prepend);
 366   static char* add_jars_to_path(char* path, const char* directory);
 367 
 368   inline void reset_item_at(int index);
 369 
 370   // Array indices for the items that make up the sysclasspath.  All except the
 371   // base are allocated in the C heap and freed by this class.
 372   enum {
 373     _scp_prefix,        // from -Xbootclasspath/p:...
 374     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 375     _scp_base,          // the default sysclasspath
 376     _scp_suffix,        // from -Xbootclasspath/a:...
 377     _scp_nitems         // the number of items, must be last.
 378   };
 379 
 380   const char* _items[_scp_nitems];
 381   DEBUG_ONLY(bool _expansion_done;)
 382 };
 383 
 384 SysClassPath::SysClassPath(const char* base) {
 385   memset(_items, 0, sizeof(_items));
 386   _items[_scp_base] = base;
 387   DEBUG_ONLY(_expansion_done = false;)
 388 }
 389 
 390 SysClassPath::~SysClassPath() {
 391   // Free everything except the base.
 392   for (int i = 0; i < _scp_nitems; ++i) {
 393     if (i != _scp_base) reset_item_at(i);
 394   }
 395   DEBUG_ONLY(_expansion_done = false;)
 396 }
 397 
 398 inline void SysClassPath::set_base(const char* base) {
 399   _items[_scp_base] = base;
 400 }
 401 
 402 inline void SysClassPath::add_prefix(const char* prefix) {
 403   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 404 }
 405 
 406 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 407   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 408 }
 409 
 410 inline void SysClassPath::add_suffix(const char* suffix) {
 411   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 412 }
 413 
 414 inline void SysClassPath::reset_item_at(int index) {
 415   assert(index < _scp_nitems && index != _scp_base, "just checking");
 416   if (_items[index] != NULL) {
 417     FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
 418     _items[index] = NULL;
 419   }
 420 }
 421 
 422 inline void SysClassPath::reset_path(const char* base) {
 423   // Clear the prefix and suffix.
 424   reset_item_at(_scp_prefix);
 425   reset_item_at(_scp_suffix);
 426   set_base(base);
 427 }
 428 
 429 //------------------------------------------------------------------------------
 430 
 431 void SysClassPath::expand_endorsed() {
 432   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 433 
 434   const char* path = Arguments::get_property("java.endorsed.dirs");
 435   if (path == NULL) {
 436     path = Arguments::get_endorsed_dir();
 437     assert(path != NULL, "no default for java.endorsed.dirs");
 438   }
 439 
 440   char* expanded_path = NULL;
 441   const char separator = *os::path_separator();
 442   const char* const end = path + strlen(path);
 443   while (path < end) {
 444     const char* tmp_end = strchr(path, separator);
 445     if (tmp_end == NULL) {
 446       expanded_path = add_jars_to_path(expanded_path, path);
 447       path = end;
 448     } else {
 449       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
 450       memcpy(dirpath, path, tmp_end - path);
 451       dirpath[tmp_end - path] = '\0';
 452       expanded_path = add_jars_to_path(expanded_path, dirpath);
 453       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
 454       path = tmp_end + 1;
 455     }
 456   }
 457   _items[_scp_endorsed] = expanded_path;
 458   DEBUG_ONLY(_expansion_done = true;)
 459 }
 460 
 461 // Combine the bootclasspath elements, some of which may be null, into a single
 462 // c-heap-allocated string.
 463 char* SysClassPath::combined_path() {
 464   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 465   assert(_expansion_done, "must call expand_endorsed() first.");
 466 
 467   size_t lengths[_scp_nitems];
 468   size_t total_len = 0;
 469 
 470   const char separator = *os::path_separator();
 471 
 472   // Get the lengths.
 473   int i;
 474   for (i = 0; i < _scp_nitems; ++i) {
 475     if (_items[i] != NULL) {
 476       lengths[i] = strlen(_items[i]);
 477       // Include space for the separator char (or a NULL for the last item).
 478       total_len += lengths[i] + 1;
 479     }
 480   }
 481   assert(total_len > 0, "empty sysclasspath not allowed");
 482 
 483   // Copy the _items to a single string.
 484   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 485   char* cp_tmp = cp;
 486   for (i = 0; i < _scp_nitems; ++i) {
 487     if (_items[i] != NULL) {
 488       memcpy(cp_tmp, _items[i], lengths[i]);
 489       cp_tmp += lengths[i];
 490       *cp_tmp++ = separator;
 491     }
 492   }
 493   *--cp_tmp = '\0';     // Replace the extra separator.
 494   return cp;
 495 }
 496 
 497 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 498 char*
 499 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 500   char *cp;
 501 
 502   assert(str != NULL, "just checking");
 503   if (path == NULL) {
 504     size_t len = strlen(str) + 1;
 505     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 506     memcpy(cp, str, len);                       // copy the trailing null
 507   } else {
 508     const char separator = *os::path_separator();
 509     size_t old_len = strlen(path);
 510     size_t str_len = strlen(str);
 511     size_t len = old_len + str_len + 2;
 512 
 513     if (prepend) {
 514       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 515       char* cp_tmp = cp;
 516       memcpy(cp_tmp, str, str_len);
 517       cp_tmp += str_len;
 518       *cp_tmp = separator;
 519       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 520       FREE_C_HEAP_ARRAY(char, path, mtInternal);
 521     } else {
 522       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 523       char* cp_tmp = cp + old_len;
 524       *cp_tmp = separator;
 525       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 526     }
 527   }
 528   return cp;
 529 }
 530 
 531 // Scan the directory and append any jar or zip files found to path.
 532 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 533 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 534   DIR* dir = os::opendir(directory);
 535   if (dir == NULL) return path;
 536 
 537   char dir_sep[2] = { '\0', '\0' };
 538   size_t directory_len = strlen(directory);
 539   const char fileSep = *os::file_separator();
 540   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 541 
 542   /* Scan the directory for jars/zips, appending them to path. */
 543   struct dirent *entry;
 544   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 545   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 546     const char* name = entry->d_name;
 547     const char* ext = name + strlen(name) - 4;
 548     bool isJarOrZip = ext > name &&
 549       (os::file_name_strcmp(ext, ".jar") == 0 ||
 550        os::file_name_strcmp(ext, ".zip") == 0);
 551     if (isJarOrZip) {
 552       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 553       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 554       path = add_to_path(path, jarpath, false);
 555       FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
 556     }
 557   }
 558   FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
 559   os::closedir(dir);
 560   return path;
 561 }
 562 
 563 // Parses a memory size specification string.
 564 static bool atomull(const char *s, julong* result) {
 565   julong n = 0;
 566   int args_read = sscanf(s, JULONG_FORMAT, &n);
 567   if (args_read != 1) {
 568     return false;
 569   }
 570   while (*s != '\0' && isdigit(*s)) {
 571     s++;
 572   }
 573   // 4705540: illegal if more characters are found after the first non-digit
 574   if (strlen(s) > 1) {
 575     return false;
 576   }
 577   switch (*s) {
 578     case 'T': case 't':
 579       *result = n * G * K;
 580       // Check for overflow.
 581       if (*result/((julong)G * K) != n) return false;
 582       return true;
 583     case 'G': case 'g':
 584       *result = n * G;
 585       if (*result/G != n) return false;
 586       return true;
 587     case 'M': case 'm':
 588       *result = n * M;
 589       if (*result/M != n) return false;
 590       return true;
 591     case 'K': case 'k':
 592       *result = n * K;
 593       if (*result/K != n) return false;
 594       return true;
 595     case '\0':
 596       *result = n;
 597       return true;
 598     default:
 599       return false;
 600   }
 601 }
 602 
 603 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 604   if (size < min_size) return arg_too_small;
 605   // Check that size will fit in a size_t (only relevant on 32-bit)
 606   if (size > max_uintx) return arg_too_big;
 607   return arg_in_range;
 608 }
 609 
 610 // Describe an argument out of range error
 611 void Arguments::describe_range_error(ArgsRange errcode) {
 612   switch(errcode) {
 613   case arg_too_big:
 614     jio_fprintf(defaultStream::error_stream(),
 615                 "The specified size exceeds the maximum "
 616                 "representable size.\n");
 617     break;
 618   case arg_too_small:
 619   case arg_unreadable:
 620   case arg_in_range:
 621     // do nothing for now
 622     break;
 623   default:
 624     ShouldNotReachHere();
 625   }
 626 }
 627 
 628 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 629   return CommandLineFlags::boolAtPut(name, &value, origin);
 630 }
 631 
 632 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 633   double v;
 634   if (sscanf(value, "%lf", &v) != 1) {
 635     return false;
 636   }
 637 
 638   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 639     return true;
 640   }
 641   return false;
 642 }
 643 
 644 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 645   julong v;
 646   intx intx_v;
 647   bool is_neg = false;
 648   // Check the sign first since atomull() parses only unsigned values.
 649   if (*value == '-') {
 650     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 651       return false;
 652     }
 653     value++;
 654     is_neg = true;
 655   }
 656   if (!atomull(value, &v)) {
 657     return false;
 658   }
 659   intx_v = (intx) v;
 660   if (is_neg) {
 661     intx_v = -intx_v;
 662   }
 663   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 664     return true;
 665   }
 666   uintx uintx_v = (uintx) v;
 667   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 668     return true;
 669   }
 670   uint64_t uint64_t_v = (uint64_t) v;
 671   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 672     return true;
 673   }
 674   return false;
 675 }
 676 
 677 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 678   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 679   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 680   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 681   return true;
 682 }
 683 
 684 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 685   const char* old_value = "";
 686   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 687   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 688   size_t new_len = strlen(new_value);
 689   const char* value;
 690   char* free_this_too = NULL;
 691   if (old_len == 0) {
 692     value = new_value;
 693   } else if (new_len == 0) {
 694     value = old_value;
 695   } else {
 696     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 697     // each new setting adds another LINE to the switch:
 698     sprintf(buf, "%s\n%s", old_value, new_value);
 699     value = buf;
 700     free_this_too = buf;
 701   }
 702   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 703   // CommandLineFlags always returns a pointer that needs freeing.
 704   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 705   if (free_this_too != NULL) {
 706     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 707     FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
 708   }
 709   return true;
 710 }
 711 
 712 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 713 
 714   // range of acceptable characters spelled out for portability reasons
 715 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 716 #define BUFLEN 255
 717   char name[BUFLEN+1];
 718   char dummy;
 719 
 720   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 721     return set_bool_flag(name, false, origin);
 722   }
 723   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 724     return set_bool_flag(name, true, origin);
 725   }
 726 
 727   char punct;
 728   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 729     const char* value = strchr(arg, '=') + 1;
 730     Flag* flag = Flag::find_flag(name, strlen(name));
 731     if (flag != NULL && flag->is_ccstr()) {
 732       if (flag->ccstr_accumulates()) {
 733         return append_to_string_flag(name, value, origin);
 734       } else {
 735         if (value[0] == '\0') {
 736           value = NULL;
 737         }
 738         return set_string_flag(name, value, origin);
 739       }
 740     }
 741   }
 742 
 743   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 744     const char* value = strchr(arg, '=') + 1;
 745     // -XX:Foo:=xxx will reset the string flag to the given value.
 746     if (value[0] == '\0') {
 747       value = NULL;
 748     }
 749     return set_string_flag(name, value, origin);
 750   }
 751 
 752 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 753 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 754 #define        NUMBER_RANGE    "[0123456789]"
 755   char value[BUFLEN + 1];
 756   char value2[BUFLEN + 1];
 757   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 758     // Looks like a floating-point number -- try again with more lenient format string
 759     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 760       return set_fp_numeric_flag(name, value, origin);
 761     }
 762   }
 763 
 764 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 765   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 766     return set_numeric_flag(name, value, origin);
 767   }
 768 
 769   return false;
 770 }
 771 
 772 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 773   assert(bldarray != NULL, "illegal argument");
 774 
 775   if (arg == NULL) {
 776     return;
 777   }
 778 
 779   int new_count = *count + 1;
 780 
 781   // expand the array and add arg to the last element
 782   if (*bldarray == NULL) {
 783     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 784   } else {
 785     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 786   }
 787   (*bldarray)[*count] = strdup(arg);
 788   *count = new_count;
 789 }
 790 
 791 void Arguments::build_jvm_args(const char* arg) {
 792   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 793 }
 794 
 795 void Arguments::build_jvm_flags(const char* arg) {
 796   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 797 }
 798 
 799 // utility function to return a string that concatenates all
 800 // strings in a given char** array
 801 const char* Arguments::build_resource_string(char** args, int count) {
 802   if (args == NULL || count == 0) {
 803     return NULL;
 804   }
 805   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 806   for (int i = 1; i < count; i++) {
 807     length += strlen(args[i]) + 1; // add 1 for a space
 808   }
 809   char* s = NEW_RESOURCE_ARRAY(char, length);
 810   strcpy(s, args[0]);
 811   for (int j = 1; j < count; j++) {
 812     strcat(s, " ");
 813     strcat(s, args[j]);
 814   }
 815   return (const char*) s;
 816 }
 817 
 818 void Arguments::print_on(outputStream* st) {
 819   st->print_cr("VM Arguments:");
 820   if (num_jvm_flags() > 0) {
 821     st->print("jvm_flags: "); print_jvm_flags_on(st);
 822   }
 823   if (num_jvm_args() > 0) {
 824     st->print("jvm_args: "); print_jvm_args_on(st);
 825   }
 826   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 827   if (_java_class_path != NULL) {
 828     char* path = _java_class_path->value();
 829     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 830   }
 831   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 832 }
 833 
 834 void Arguments::print_jvm_flags_on(outputStream* st) {
 835   if (_num_jvm_flags > 0) {
 836     for (int i=0; i < _num_jvm_flags; i++) {
 837       st->print("%s ", _jvm_flags_array[i]);
 838     }
 839     st->print_cr("");
 840   }
 841 }
 842 
 843 void Arguments::print_jvm_args_on(outputStream* st) {
 844   if (_num_jvm_args > 0) {
 845     for (int i=0; i < _num_jvm_args; i++) {
 846       st->print("%s ", _jvm_args_array[i]);
 847     }
 848     st->print_cr("");
 849   }
 850 }
 851 
 852 bool Arguments::process_argument(const char* arg,
 853     jboolean ignore_unrecognized, Flag::Flags origin) {
 854 
 855   JDK_Version since = JDK_Version();
 856 
 857   if (parse_argument(arg, origin) || ignore_unrecognized) {
 858     return true;
 859   }
 860 
 861   bool has_plus_minus = (*arg == '+' || *arg == '-');
 862   const char* const argname = has_plus_minus ? arg + 1 : arg;
 863   if (is_newly_obsolete(arg, &since)) {
 864     char version[256];
 865     since.to_string(version, sizeof(version));
 866     warning("ignoring option %s; support was removed in %s", argname, version);
 867     return true;
 868   }
 869 
 870   // For locked flags, report a custom error message if available.
 871   // Otherwise, report the standard unrecognized VM option.
 872 
 873   size_t arg_len;
 874   const char* equal_sign = strchr(argname, '=');
 875   if (equal_sign == NULL) {
 876     arg_len = strlen(argname);
 877   } else {
 878     arg_len = equal_sign - argname;
 879   }
 880 
 881   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
 882   if (found_flag != NULL) {
 883     char locked_message_buf[BUFLEN];
 884     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 885     if (strlen(locked_message_buf) == 0) {
 886       if (found_flag->is_bool() && !has_plus_minus) {
 887         jio_fprintf(defaultStream::error_stream(),
 888           "Missing +/- setting for VM option '%s'\n", argname);
 889       } else if (!found_flag->is_bool() && has_plus_minus) {
 890         jio_fprintf(defaultStream::error_stream(),
 891           "Unexpected +/- setting in VM option '%s'\n", argname);
 892       } else {
 893         jio_fprintf(defaultStream::error_stream(),
 894           "Improperly specified VM option '%s'\n", argname);
 895       }
 896     } else {
 897       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 898     }
 899   } else {
 900     jio_fprintf(defaultStream::error_stream(),
 901                 "Unrecognized VM option '%s'\n", argname);
 902     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 903     if (fuzzy_matched != NULL) {
 904       jio_fprintf(defaultStream::error_stream(),
 905                   "Did you mean '%s%s%s'?\n",
 906                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 907                   fuzzy_matched->_name,
 908                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 909     }
 910   }
 911 
 912   // allow for commandline "commenting out" options like -XX:#+Verbose
 913   return arg[0] == '#';
 914 }
 915 
 916 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 917   FILE* stream = fopen(file_name, "rb");
 918   if (stream == NULL) {
 919     if (should_exist) {
 920       jio_fprintf(defaultStream::error_stream(),
 921                   "Could not open settings file %s\n", file_name);
 922       return false;
 923     } else {
 924       return true;
 925     }
 926   }
 927 
 928   char token[1024];
 929   int  pos = 0;
 930 
 931   bool in_white_space = true;
 932   bool in_comment     = false;
 933   bool in_quote       = false;
 934   char quote_c        = 0;
 935   bool result         = true;
 936 
 937   int c = getc(stream);
 938   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 939     if (in_white_space) {
 940       if (in_comment) {
 941         if (c == '\n') in_comment = false;
 942       } else {
 943         if (c == '#') in_comment = true;
 944         else if (!isspace(c)) {
 945           in_white_space = false;
 946           token[pos++] = c;
 947         }
 948       }
 949     } else {
 950       if (c == '\n' || (!in_quote && isspace(c))) {
 951         // token ends at newline, or at unquoted whitespace
 952         // this allows a way to include spaces in string-valued options
 953         token[pos] = '\0';
 954         logOption(token);
 955         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 956         build_jvm_flags(token);
 957         pos = 0;
 958         in_white_space = true;
 959         in_quote = false;
 960       } else if (!in_quote && (c == '\'' || c == '"')) {
 961         in_quote = true;
 962         quote_c = c;
 963       } else if (in_quote && (c == quote_c)) {
 964         in_quote = false;
 965       } else {
 966         token[pos++] = c;
 967       }
 968     }
 969     c = getc(stream);
 970   }
 971   if (pos > 0) {
 972     token[pos] = '\0';
 973     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 974     build_jvm_flags(token);
 975   }
 976   fclose(stream);
 977   return result;
 978 }
 979 
 980 //=============================================================================================================
 981 // Parsing of properties (-D)
 982 
 983 const char* Arguments::get_property(const char* key) {
 984   return PropertyList_get_value(system_properties(), key);
 985 }
 986 
 987 bool Arguments::add_property(const char* prop) {
 988   const char* eq = strchr(prop, '=');
 989   char* key;
 990   // ns must be static--its address may be stored in a SystemProperty object.
 991   const static char ns[1] = {0};
 992   char* value = (char *)ns;
 993 
 994   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
 995   key = AllocateHeap(key_len + 1, mtInternal);
 996   strncpy(key, prop, key_len);
 997   key[key_len] = '\0';
 998 
 999   if (eq != NULL) {
1000     size_t value_len = strlen(prop) - key_len - 1;
1001     value = AllocateHeap(value_len + 1, mtInternal);
1002     strncpy(value, &prop[key_len + 1], value_len + 1);
1003   }
1004 
1005   if (strcmp(key, "java.compiler") == 0) {
1006     process_java_compiler_argument(value);
1007     FreeHeap(key);
1008     if (eq != NULL) {
1009       FreeHeap(value);
1010     }
1011     return true;
1012   } else if (strcmp(key, "sun.java.command") == 0) {
1013     _java_command = value;
1014 
1015     // Record value in Arguments, but let it get passed to Java.
1016   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1017     // launcher.pid property is private and is processed
1018     // in process_sun_java_launcher_properties();
1019     // the sun.java.launcher property is passed on to the java application
1020     FreeHeap(key);
1021     if (eq != NULL) {
1022       FreeHeap(value);
1023     }
1024     return true;
1025   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1026     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1027     // its value without going through the property list or making a Java call.
1028     _java_vendor_url_bug = value;
1029   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1030     PropertyList_unique_add(&_system_properties, key, value, true);
1031     return true;
1032   }
1033   // Create new property and add at the end of the list
1034   PropertyList_unique_add(&_system_properties, key, value);
1035   return true;
1036 }
1037 
1038 //===========================================================================================================
1039 // Setting int/mixed/comp mode flags
1040 
1041 void Arguments::set_mode_flags(Mode mode) {
1042   // Set up default values for all flags.
1043   // If you add a flag to any of the branches below,
1044   // add a default value for it here.
1045   set_java_compiler(false);
1046   _mode                      = mode;
1047 
1048   // Ensure Agent_OnLoad has the correct initial values.
1049   // This may not be the final mode; mode may change later in onload phase.
1050   PropertyList_unique_add(&_system_properties, "java.vm.info",
1051                           (char*)VM_Version::vm_info_string(), false);
1052 
1053   UseInterpreter             = true;
1054   UseCompiler                = true;
1055   UseLoopCounter             = true;
1056 
1057 #ifndef ZERO
1058   // Turn these off for mixed and comp.  Leave them on for Zero.
1059   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1060     UseFastAccessorMethods = (mode == _int);
1061   }
1062   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1063     UseFastEmptyMethods = (mode == _int);
1064   }
1065 #endif
1066 
1067   // Default values may be platform/compiler dependent -
1068   // use the saved values
1069   ClipInlining               = Arguments::_ClipInlining;
1070   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1071   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1072   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1073 
1074   // Change from defaults based on mode
1075   switch (mode) {
1076   default:
1077     ShouldNotReachHere();
1078     break;
1079   case _int:
1080     UseCompiler              = false;
1081     UseLoopCounter           = false;
1082     AlwaysCompileLoopMethods = false;
1083     UseOnStackReplacement    = false;
1084     break;
1085   case _mixed:
1086     // same as default
1087     break;
1088   case _comp:
1089     UseInterpreter           = false;
1090     BackgroundCompilation    = false;
1091     ClipInlining             = false;
1092     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1093     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1094     // compile a level 4 (C2) and then continue executing it.
1095     if (TieredCompilation) {
1096       Tier3InvokeNotifyFreqLog = 0;
1097       Tier4InvocationThreshold = 0;
1098     }
1099     break;
1100   }
1101 }
1102 
1103 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1104 // Conflict: required to use shared spaces (-Xshare:on), but
1105 // incompatible command line options were chosen.
1106 
1107 static void no_shared_spaces() {
1108   if (RequireSharedSpaces) {
1109     jio_fprintf(defaultStream::error_stream(),
1110       "Class data sharing is inconsistent with other specified options.\n");
1111     vm_exit_during_initialization("Unable to use shared archive.", NULL);
1112   } else {
1113     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1114   }
1115 }
1116 #endif
1117 
1118 void Arguments::set_tiered_flags() {
1119   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1120   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1121     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1122   }
1123   if (CompilationPolicyChoice < 2) {
1124     vm_exit_during_initialization(
1125       "Incompatible compilation policy selected", NULL);
1126   }
1127   // Increase the code cache size - tiered compiles a lot more.
1128   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1129     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1130     FLAG_SET_DEFAULT(ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5);
1131     FLAG_SET_DEFAULT(NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5);
1132   }
1133   if (!UseInterpreter) { // -Xcomp
1134     Tier3InvokeNotifyFreqLog = 0;
1135     Tier4InvocationThreshold = 0;
1136   }
1137   if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
1138     FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
1139   }
1140 }
1141 
1142 #if INCLUDE_ALL_GCS
1143 static void disable_adaptive_size_policy(const char* collector_name) {
1144   if (UseAdaptiveSizePolicy) {
1145     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1146       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1147               collector_name);
1148     }
1149     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1150   }
1151 }
1152 
1153 void Arguments::set_parnew_gc_flags() {
1154   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1155          "control point invariant");
1156   assert(UseParNewGC, "Error");
1157 
1158   // Turn off AdaptiveSizePolicy for parnew until it is complete.
1159   disable_adaptive_size_policy("UseParNewGC");
1160 
1161   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1162     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1163     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1164   } else if (ParallelGCThreads == 0) {
1165     jio_fprintf(defaultStream::error_stream(),
1166         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1167     vm_exit(1);
1168   }
1169 
1170   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1171   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1172   // we set them to 1024 and 1024.
1173   // See CR 6362902.
1174   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1175     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1176   }
1177   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1178     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1179   }
1180 
1181   // AlwaysTenure flag should make ParNew promote all at first collection.
1182   // See CR 6362902.
1183   if (AlwaysTenure) {
1184     FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1185   }
1186   // When using compressed oops, we use local overflow stacks,
1187   // rather than using a global overflow list chained through
1188   // the klass word of the object's pre-image.
1189   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1190     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1191       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1192     }
1193     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1194   }
1195   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1196 }
1197 
1198 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1199 // sparc/solaris for certain applications, but would gain from
1200 // further optimization and tuning efforts, and would almost
1201 // certainly gain from analysis of platform and environment.
1202 void Arguments::set_cms_and_parnew_gc_flags() {
1203   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1204   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1205 
1206   // If we are using CMS, we prefer to UseParNewGC,
1207   // unless explicitly forbidden.
1208   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1209     FLAG_SET_ERGO(bool, UseParNewGC, true);
1210   }
1211 
1212   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1213   disable_adaptive_size_policy("UseConcMarkSweepGC");
1214 
1215   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1216   // as needed.
1217   if (UseParNewGC) {
1218     set_parnew_gc_flags();
1219   }
1220 
1221   size_t max_heap = align_size_down(MaxHeapSize,
1222                                     CardTableRS::ct_max_alignment_constraint());
1223 
1224   // Now make adjustments for CMS
1225   intx   tenuring_default = (intx)6;
1226   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1227 
1228   // Preferred young gen size for "short" pauses:
1229   // upper bound depends on # of threads and NewRatio.
1230   const uintx parallel_gc_threads =
1231     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1232   const size_t preferred_max_new_size_unaligned =
1233     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1234   size_t preferred_max_new_size =
1235     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1236 
1237   // Unless explicitly requested otherwise, size young gen
1238   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1239 
1240   // If either MaxNewSize or NewRatio is set on the command line,
1241   // assume the user is trying to set the size of the young gen.
1242   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1243 
1244     // Set MaxNewSize to our calculated preferred_max_new_size unless
1245     // NewSize was set on the command line and it is larger than
1246     // preferred_max_new_size.
1247     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1248       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1249     } else {
1250       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1251     }
1252     if (PrintGCDetails && Verbose) {
1253       // Too early to use gclog_or_tty
1254       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1255     }
1256 
1257     // Code along this path potentially sets NewSize and OldSize
1258     if (PrintGCDetails && Verbose) {
1259       // Too early to use gclog_or_tty
1260       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1261            " initial_heap_size:  " SIZE_FORMAT
1262            " max_heap: " SIZE_FORMAT,
1263            min_heap_size(), InitialHeapSize, max_heap);
1264     }
1265     size_t min_new = preferred_max_new_size;
1266     if (FLAG_IS_CMDLINE(NewSize)) {
1267       min_new = NewSize;
1268     }
1269     if (max_heap > min_new && min_heap_size() > min_new) {
1270       // Unless explicitly requested otherwise, make young gen
1271       // at least min_new, and at most preferred_max_new_size.
1272       if (FLAG_IS_DEFAULT(NewSize)) {
1273         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1274         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1275         if (PrintGCDetails && Verbose) {
1276           // Too early to use gclog_or_tty
1277           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1278         }
1279       }
1280       // Unless explicitly requested otherwise, size old gen
1281       // so it's NewRatio x of NewSize.
1282       if (FLAG_IS_DEFAULT(OldSize)) {
1283         if (max_heap > NewSize) {
1284           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1285           if (PrintGCDetails && Verbose) {
1286             // Too early to use gclog_or_tty
1287             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1288           }
1289         }
1290       }
1291     }
1292   }
1293   // Unless explicitly requested otherwise, definitely
1294   // promote all objects surviving "tenuring_default" scavenges.
1295   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1296       FLAG_IS_DEFAULT(SurvivorRatio)) {
1297     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1298   }
1299   // If we decided above (or user explicitly requested)
1300   // `promote all' (via MaxTenuringThreshold := 0),
1301   // prefer minuscule survivor spaces so as not to waste
1302   // space for (non-existent) survivors
1303   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1304     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1305   }
1306   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1307   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1308   // This is done in order to make ParNew+CMS configuration to work
1309   // with YoungPLABSize and OldPLABSize options.
1310   // See CR 6362902.
1311   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1312     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1313       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1314       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1315       // the value (either from the command line or ergonomics) of
1316       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1317       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1318     } else {
1319       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1320       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1321       // we'll let it to take precedence.
1322       jio_fprintf(defaultStream::error_stream(),
1323                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1324                   " options are specified for the CMS collector."
1325                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1326     }
1327   }
1328   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1329     // OldPLAB sizing manually turned off: Use a larger default setting,
1330     // unless it was manually specified. This is because a too-low value
1331     // will slow down scavenges.
1332     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1333       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1334     }
1335   }
1336   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1337   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1338   // If either of the static initialization defaults have changed, note this
1339   // modification.
1340   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1341     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1342   }
1343   if (PrintGCDetails && Verbose) {
1344     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1345       MarkStackSize / K, MarkStackSizeMax / K);
1346     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1347   }
1348 }
1349 #endif // INCLUDE_ALL_GCS
1350 
1351 void set_object_alignment() {
1352   // Object alignment.
1353   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1354   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1355   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1356   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1357   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1358   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1359 
1360   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1361   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1362 
1363   // Oop encoding heap max
1364   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1365 
1366 #if INCLUDE_ALL_GCS
1367   // Set CMS global values
1368   CompactibleFreeListSpace::set_cms_values();
1369 #endif // INCLUDE_ALL_GCS
1370 }
1371 
1372 bool verify_object_alignment() {
1373   // Object alignment.
1374   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1375     jio_fprintf(defaultStream::error_stream(),
1376                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1377                 (int)ObjectAlignmentInBytes);
1378     return false;
1379   }
1380   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1381     jio_fprintf(defaultStream::error_stream(),
1382                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1383                 (int)ObjectAlignmentInBytes, BytesPerLong);
1384     return false;
1385   }
1386   // It does not make sense to have big object alignment
1387   // since a space lost due to alignment will be greater
1388   // then a saved space from compressed oops.
1389   if ((int)ObjectAlignmentInBytes > 256) {
1390     jio_fprintf(defaultStream::error_stream(),
1391                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1392                 (int)ObjectAlignmentInBytes);
1393     return false;
1394   }
1395   // In case page size is very small.
1396   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1397     jio_fprintf(defaultStream::error_stream(),
1398                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1399                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1400     return false;
1401   }
1402   return true;
1403 }
1404 
1405 uintx Arguments::max_heap_for_compressed_oops() {
1406   // Avoid sign flip.
1407   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1408   // We need to fit both the NULL page and the heap into the memory budget, while
1409   // keeping alignment constraints of the heap. To guarantee the latter, as the
1410   // NULL page is located before the heap, we pad the NULL page to the conservative
1411   // maximum alignment that the GC may ever impose upon the heap.
1412   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1413     Arguments::conservative_max_heap_alignment());
1414 
1415   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1416   NOT_LP64(ShouldNotReachHere(); return 0);
1417 }
1418 
1419 bool Arguments::should_auto_select_low_pause_collector() {
1420   if (UseAutoGCSelectPolicy &&
1421       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1422       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1423     if (PrintGCDetails) {
1424       // Cannot use gclog_or_tty yet.
1425       tty->print_cr("Automatic selection of the low pause collector"
1426        " based on pause goal of %d (ms)", MaxGCPauseMillis);
1427     }
1428     return true;
1429   }
1430   return false;
1431 }
1432 
1433 void Arguments::set_use_compressed_oops() {
1434 #ifndef ZERO
1435 #ifdef _LP64
1436   // MaxHeapSize is not set up properly at this point, but
1437   // the only value that can override MaxHeapSize if we are
1438   // to use UseCompressedOops is InitialHeapSize.
1439   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1440 
1441   if (max_heap_size <= max_heap_for_compressed_oops()) {
1442 #if !defined(COMPILER1) || defined(TIERED)
1443     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1444       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1445     }
1446 #endif
1447 #ifdef _WIN64
1448     if (UseLargePages && UseCompressedOops) {
1449       // Cannot allocate guard pages for implicit checks in indexed addressing
1450       // mode, when large pages are specified on windows.
1451       // This flag could be switched ON if narrow oop base address is set to 0,
1452       // see code in Universe::initialize_heap().
1453       Universe::set_narrow_oop_use_implicit_null_checks(false);
1454     }
1455 #endif //  _WIN64
1456   } else {
1457     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1458       warning("Max heap size too large for Compressed Oops");
1459       FLAG_SET_DEFAULT(UseCompressedOops, false);
1460       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1461     }
1462   }
1463 #endif // _LP64
1464 #endif // ZERO
1465 }
1466 
1467 
1468 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1469 // set_use_compressed_oops().
1470 void Arguments::set_use_compressed_klass_ptrs() {
1471 #ifndef ZERO
1472 #ifdef _LP64
1473   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1474   if (!UseCompressedOops) {
1475     if (UseCompressedClassPointers) {
1476       warning("UseCompressedClassPointers requires UseCompressedOops");
1477     }
1478     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1479   } else {
1480     // Turn on UseCompressedClassPointers too
1481     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1482       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1483     }
1484     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1485     if (UseCompressedClassPointers) {
1486       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1487         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1488         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1489       }
1490     }
1491   }
1492 #endif // _LP64
1493 #endif // !ZERO
1494 }
1495 
1496 void Arguments::set_conservative_max_heap_alignment() {
1497   // The conservative maximum required alignment for the heap is the maximum of
1498   // the alignments imposed by several sources: any requirements from the heap
1499   // itself, the collector policy and the maximum page size we may run the VM
1500   // with.
1501   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1502 #if INCLUDE_ALL_GCS
1503   if (UseParallelGC) {
1504     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1505   } else if (UseG1GC) {
1506     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1507   }
1508 #endif // INCLUDE_ALL_GCS
1509   _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1510     CollectorPolicy::compute_max_alignment());
1511 }
1512 
1513 void Arguments::set_ergonomics_flags() {
1514 
1515   if (os::is_server_class_machine()) {
1516     // If no other collector is requested explicitly,
1517     // let the VM select the collector based on
1518     // machine class and automatic selection policy.
1519     if (!UseSerialGC &&
1520         !UseConcMarkSweepGC &&
1521         !UseG1GC &&
1522         !UseParNewGC &&
1523         FLAG_IS_DEFAULT(UseParallelGC)) {
1524       if (should_auto_select_low_pause_collector()) {
1525         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1526       } else {
1527         FLAG_SET_ERGO(bool, UseParallelGC, true);
1528       }
1529     }
1530   }
1531 #ifdef COMPILER2
1532   // Shared spaces work fine with other GCs but causes bytecode rewriting
1533   // to be disabled, which hurts interpreter performance and decreases
1534   // server performance.  When -server is specified, keep the default off
1535   // unless it is asked for.  Future work: either add bytecode rewriting
1536   // at link time, or rewrite bytecodes in non-shared methods.
1537   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1538       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1539     no_shared_spaces();
1540   }
1541 #endif
1542 
1543   set_conservative_max_heap_alignment();
1544 
1545 #ifndef ZERO
1546 #ifdef _LP64
1547   set_use_compressed_oops();
1548 
1549   // set_use_compressed_klass_ptrs() must be called after calling
1550   // set_use_compressed_oops().
1551   set_use_compressed_klass_ptrs();
1552 
1553   // Also checks that certain machines are slower with compressed oops
1554   // in vm_version initialization code.
1555 #endif // _LP64
1556 #endif // !ZERO
1557 }
1558 
1559 void Arguments::set_parallel_gc_flags() {
1560   assert(UseParallelGC || UseParallelOldGC, "Error");
1561   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1562   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1563     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1564   }
1565   FLAG_SET_DEFAULT(UseParallelGC, true);
1566 
1567   // If no heap maximum was requested explicitly, use some reasonable fraction
1568   // of the physical memory, up to a maximum of 1GB.
1569   FLAG_SET_DEFAULT(ParallelGCThreads,
1570                    Abstract_VM_Version::parallel_worker_threads());
1571   if (ParallelGCThreads == 0) {
1572     jio_fprintf(defaultStream::error_stream(),
1573         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1574     vm_exit(1);
1575   }
1576 
1577 
1578   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1579   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1580   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1581   // See CR 6362902 for details.
1582   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1583     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1584        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1585     }
1586     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1587       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1588     }
1589   }
1590 
1591   if (UseParallelOldGC) {
1592     // Par compact uses lower default values since they are treated as
1593     // minimums.  These are different defaults because of the different
1594     // interpretation and are not ergonomically set.
1595     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1596       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1597     }
1598   }
1599 }
1600 
1601 void Arguments::set_g1_gc_flags() {
1602   assert(UseG1GC, "Error");
1603 #ifdef COMPILER1
1604   FastTLABRefill = false;
1605 #endif
1606   FLAG_SET_DEFAULT(ParallelGCThreads,
1607                      Abstract_VM_Version::parallel_worker_threads());
1608   if (ParallelGCThreads == 0) {
1609     FLAG_SET_DEFAULT(ParallelGCThreads,
1610                      Abstract_VM_Version::parallel_worker_threads());
1611   }
1612 
1613   // MarkStackSize will be set (if it hasn't been set by the user)
1614   // when concurrent marking is initialized.
1615   // Its value will be based upon the number of parallel marking threads.
1616   // But we do set the maximum mark stack size here.
1617   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1618     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1619   }
1620 
1621   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1622     // In G1, we want the default GC overhead goal to be higher than
1623     // say in PS. So we set it here to 10%. Otherwise the heap might
1624     // be expanded more aggressively than we would like it to. In
1625     // fact, even 10% seems to not be high enough in some cases
1626     // (especially small GC stress tests that the main thing they do
1627     // is allocation). We might consider increase it further.
1628     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1629   }
1630 
1631   if (PrintGCDetails && Verbose) {
1632     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1633       MarkStackSize / K, MarkStackSizeMax / K);
1634     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1635   }
1636 }
1637 
1638 julong Arguments::limit_by_allocatable_memory(julong limit) {
1639   julong max_allocatable;
1640   julong result = limit;
1641   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1642     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1643   }
1644   return result;
1645 }
1646 
1647 void Arguments::set_heap_size() {
1648   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1649     // Deprecated flag
1650     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1651   }
1652 
1653   const julong phys_mem =
1654     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1655                             : (julong)MaxRAM;
1656 
1657   // If the maximum heap size has not been set with -Xmx,
1658   // then set it as fraction of the size of physical memory,
1659   // respecting the maximum and minimum sizes of the heap.
1660   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1661     julong reasonable_max = phys_mem / MaxRAMFraction;
1662 
1663     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1664       // Small physical memory, so use a minimum fraction of it for the heap
1665       reasonable_max = phys_mem / MinRAMFraction;
1666     } else {
1667       // Not-small physical memory, so require a heap at least
1668       // as large as MaxHeapSize
1669       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1670     }
1671     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1672       // Limit the heap size to ErgoHeapSizeLimit
1673       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1674     }
1675     if (UseCompressedOops) {
1676       // Limit the heap size to the maximum possible when using compressed oops
1677       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1678       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1679         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1680         // but it should be not less than default MaxHeapSize.
1681         max_coop_heap -= HeapBaseMinAddress;
1682       }
1683       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1684     }
1685     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1686 
1687     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1688       // An initial heap size was specified on the command line,
1689       // so be sure that the maximum size is consistent.  Done
1690       // after call to limit_by_allocatable_memory because that
1691       // method might reduce the allocation size.
1692       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1693     }
1694 
1695     if (PrintGCDetails && Verbose) {
1696       // Cannot use gclog_or_tty yet.
1697       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
1698     }
1699     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1700   }
1701 
1702   // If the minimum or initial heap_size have not been set or requested to be set
1703   // ergonomically, set them accordingly.
1704   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1705     julong reasonable_minimum = (julong)(OldSize + NewSize);
1706 
1707     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1708 
1709     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1710 
1711     if (InitialHeapSize == 0) {
1712       julong reasonable_initial = phys_mem / InitialRAMFraction;
1713 
1714       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1715       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1716 
1717       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1718 
1719       if (PrintGCDetails && Verbose) {
1720         // Cannot use gclog_or_tty yet.
1721         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1722       }
1723       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1724     }
1725     // If the minimum heap size has not been set (via -Xms),
1726     // synchronize with InitialHeapSize to avoid errors with the default value.
1727     if (min_heap_size() == 0) {
1728       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1729       if (PrintGCDetails && Verbose) {
1730         // Cannot use gclog_or_tty yet.
1731         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1732       }
1733     }
1734   }
1735 }
1736 
1737 // This must be called after ergonomics because we want bytecode rewriting
1738 // if the server compiler is used, or if UseSharedSpaces is disabled.
1739 void Arguments::set_bytecode_flags() {
1740   // Better not attempt to store into a read-only space.
1741   if (UseSharedSpaces) {
1742     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1743     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1744   }
1745 
1746   if (!RewriteBytecodes) {
1747     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1748   }
1749 }
1750 
1751 // Aggressive optimization flags  -XX:+AggressiveOpts
1752 void Arguments::set_aggressive_opts_flags() {
1753 #ifdef COMPILER2
1754   if (AggressiveUnboxing) {
1755     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1756       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1757     } else if (!EliminateAutoBox) {
1758       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1759       AggressiveUnboxing = false;
1760     }
1761     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1762       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1763     } else if (!DoEscapeAnalysis) {
1764       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1765       AggressiveUnboxing = false;
1766     }
1767   }
1768   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1769     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1770       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1771     }
1772     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1773       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1774     }
1775 
1776     // Feed the cache size setting into the JDK
1777     char buffer[1024];
1778     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1779     add_property(buffer);
1780   }
1781   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1782     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1783   }
1784 #endif
1785 
1786   if (AggressiveOpts) {
1787 // Sample flag setting code
1788 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1789 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1790 //    }
1791   }
1792 }
1793 
1794 //===========================================================================================================
1795 // Parsing of java.compiler property
1796 
1797 void Arguments::process_java_compiler_argument(char* arg) {
1798   // For backwards compatibility, Djava.compiler=NONE or ""
1799   // causes us to switch to -Xint mode UNLESS -Xdebug
1800   // is also specified.
1801   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1802     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1803   }
1804 }
1805 
1806 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1807   _sun_java_launcher = strdup(launcher);
1808   if (strcmp("gamma", _sun_java_launcher) == 0) {
1809     _created_by_gamma_launcher = true;
1810   }
1811 }
1812 
1813 bool Arguments::created_by_java_launcher() {
1814   assert(_sun_java_launcher != NULL, "property must have value");
1815   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1816 }
1817 
1818 bool Arguments::created_by_gamma_launcher() {
1819   return _created_by_gamma_launcher;
1820 }
1821 
1822 //===========================================================================================================
1823 // Parsing of main arguments
1824 
1825 bool Arguments::verify_interval(uintx val, uintx min,
1826                                 uintx max, const char* name) {
1827   // Returns true iff value is in the inclusive interval [min..max]
1828   // false, otherwise.
1829   if (val >= min && val <= max) {
1830     return true;
1831   }
1832   jio_fprintf(defaultStream::error_stream(),
1833               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1834               " and " UINTX_FORMAT "\n",
1835               name, val, min, max);
1836   return false;
1837 }
1838 
1839 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1840   // Returns true if given value is at least specified min threshold
1841   // false, otherwise.
1842   if (val >= min ) {
1843       return true;
1844   }
1845   jio_fprintf(defaultStream::error_stream(),
1846               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1847               name, val, min);
1848   return false;
1849 }
1850 
1851 bool Arguments::verify_percentage(uintx value, const char* name) {
1852   if (value <= 100) {
1853     return true;
1854   }
1855   jio_fprintf(defaultStream::error_stream(),
1856               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1857               name, value);
1858   return false;
1859 }
1860 
1861 #if !INCLUDE_ALL_GCS
1862 #ifdef ASSERT
1863 static bool verify_serial_gc_flags() {
1864   return (UseSerialGC &&
1865         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1866           UseParallelGC || UseParallelOldGC));
1867 }
1868 #endif // ASSERT
1869 #endif // INCLUDE_ALL_GCS
1870 
1871 // check if do gclog rotation
1872 // +UseGCLogFileRotation is a must,
1873 // no gc log rotation when log file not supplied or
1874 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1875 void check_gclog_consistency() {
1876   if (UseGCLogFileRotation) {
1877     if ((Arguments::gc_log_filename() == NULL) ||
1878         (NumberOfGCLogFiles == 0)  ||
1879         (GCLogFileSize == 0)) {
1880       jio_fprintf(defaultStream::output_stream(),
1881                   "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"
1882                   "where num_of_file > 0 and num_of_size > 0\n"
1883                   "GC log rotation is turned off\n");
1884       UseGCLogFileRotation = false;
1885     }
1886   }
1887 
1888   if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1889         FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1890         jio_fprintf(defaultStream::output_stream(),
1891                     "GCLogFileSize changed to minimum 8K\n");
1892   }
1893 }
1894 
1895 // This function is called for -Xloggc:<filename>, it can be used
1896 // to check if a given file name(or string) conforms to the following
1897 // specification:
1898 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1899 // %p and %t only allowed once. We only limit usage of filename not path
1900 bool is_filename_valid(const char *file_name) {
1901   const char* p = file_name;
1902   char file_sep = os::file_separator()[0];
1903   const char* cp;
1904   // skip prefix path
1905   for (cp = file_name; *cp != '\0'; cp++) {
1906     if (*cp == '/' || *cp == file_sep) {
1907       p = cp + 1;
1908     }
1909   }
1910 
1911   int count_p = 0;
1912   int count_t = 0;
1913   while (*p != '\0') {
1914     if ((*p >= '0' && *p <= '9') ||
1915         (*p >= 'A' && *p <= 'Z') ||
1916         (*p >= 'a' && *p <= 'z') ||
1917          *p == '-'               ||
1918          *p == '_'               ||
1919          *p == '.') {
1920        p++;
1921        continue;
1922     }
1923     if (*p == '%') {
1924       if(*(p + 1) == 'p') {
1925         p += 2;
1926         count_p ++;
1927         continue;
1928       }
1929       if (*(p + 1) == 't') {
1930         p += 2;
1931         count_t ++;
1932         continue;
1933       }
1934     }
1935     return false;
1936   }
1937   return count_p < 2 && count_t < 2;
1938 }
1939 
1940 // Check consistency of GC selection
1941 bool Arguments::check_gc_consistency() {
1942   check_gclog_consistency();
1943   bool status = true;
1944   // Ensure that the user has not selected conflicting sets
1945   // of collectors. [Note: this check is merely a user convenience;
1946   // collectors over-ride each other so that only a non-conflicting
1947   // set is selected; however what the user gets is not what they
1948   // may have expected from the combination they asked for. It's
1949   // better to reduce user confusion by not allowing them to
1950   // select conflicting combinations.
1951   uint i = 0;
1952   if (UseSerialGC)                       i++;
1953   if (UseConcMarkSweepGC || UseParNewGC) i++;
1954   if (UseParallelGC || UseParallelOldGC) i++;
1955   if (UseG1GC)                           i++;
1956   if (i > 1) {
1957     jio_fprintf(defaultStream::error_stream(),
1958                 "Conflicting collector combinations in option list; "
1959                 "please refer to the release notes for the combinations "
1960                 "allowed\n");
1961     status = false;
1962   } else if (ReservedCodeCacheSize > 2*G) {
1963     // Code cache size larger than MAXINT is not supported.
1964     jio_fprintf(defaultStream::error_stream(),
1965                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
1966                 (2*G)/M);
1967     status = false;
1968   }
1969   return status;
1970 }
1971 
1972 void Arguments::check_deprecated_gcs() {
1973   if (UseConcMarkSweepGC && !UseParNewGC) {
1974     warning("Using the DefNew young collector with the CMS collector is deprecated "
1975         "and will likely be removed in a future release");
1976   }
1977 
1978   if (UseParNewGC && !UseConcMarkSweepGC) {
1979     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1980     // set up UseSerialGC properly, so that can't be used in the check here.
1981     warning("Using the ParNew young collector with the Serial old collector is deprecated "
1982         "and will likely be removed in a future release");
1983   }
1984 
1985   if (CMSIncrementalMode) {
1986     warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1987   }
1988 }
1989 
1990 void Arguments::check_deprecated_gc_flags() {
1991   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1992     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1993             "and will likely be removed in future release");
1994   }
1995   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1996     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1997         "Use MaxRAMFraction instead.");
1998   }
1999 }
2000 
2001 // Check stack pages settings
2002 bool Arguments::check_stack_pages()
2003 {
2004   bool status = true;
2005   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2006   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2007   // greater stack shadow pages can't generate instruction to bang stack
2008   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2009   return status;
2010 }
2011 
2012 // Check the consistency of vm_init_args
2013 bool Arguments::check_vm_args_consistency() {
2014   // Method for adding checks for flag consistency.
2015   // The intent is to warn the user of all possible conflicts,
2016   // before returning an error.
2017   // Note: Needs platform-dependent factoring.
2018   bool status = true;
2019 
2020   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2021   // builds so the cost of stack banging can be measured.
2022 #if (defined(PRODUCT) && defined(SOLARIS))
2023   if (!UseBoundThreads && !UseStackBanging) {
2024     jio_fprintf(defaultStream::error_stream(),
2025                 "-UseStackBanging conflicts with -UseBoundThreads\n");
2026 
2027      status = false;
2028   }
2029 #endif
2030 
2031   if (TLABRefillWasteFraction == 0) {
2032     jio_fprintf(defaultStream::error_stream(),
2033                 "TLABRefillWasteFraction should be a denominator, "
2034                 "not " SIZE_FORMAT "\n",
2035                 TLABRefillWasteFraction);
2036     status = false;
2037   }
2038 
2039   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2040                               "AdaptiveSizePolicyWeight");
2041   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2042   status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
2043   status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
2044 
2045   // Divide by bucket size to prevent a large size from causing rollover when
2046   // calculating amount of memory needed to be allocated for the String table.
2047   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2048     (max_uintx / StringTable::bucket_size()), "StringTable size");
2049 
2050   if (MinHeapFreeRatio > MaxHeapFreeRatio) {
2051     jio_fprintf(defaultStream::error_stream(),
2052                 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2053                 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
2054                 MinHeapFreeRatio, MaxHeapFreeRatio);
2055     status = false;
2056   }
2057   // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2058   MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
2059 
2060   // Min/MaxMetaspaceFreeRatio
2061   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2062   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2063 
2064   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2065     jio_fprintf(defaultStream::error_stream(),
2066                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2067                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2068                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2069                 MinMetaspaceFreeRatio,
2070                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2071                 MaxMetaspaceFreeRatio);
2072     status = false;
2073   }
2074 
2075   // Trying to keep 100% free is not practical
2076   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2077 
2078   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2079     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2080   }
2081 
2082   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2083     // Settings to encourage splitting.
2084     if (!FLAG_IS_CMDLINE(NewRatio)) {
2085       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2086     }
2087     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2088       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2089     }
2090   }
2091 
2092   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2093   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2094   if (GCTimeLimit == 100) {
2095     // Turn off gc-overhead-limit-exceeded checks
2096     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2097   }
2098 
2099   status = status && check_gc_consistency();
2100   status = status && check_stack_pages();
2101 
2102   if (CMSIncrementalMode) {
2103     if (!UseConcMarkSweepGC) {
2104       jio_fprintf(defaultStream::error_stream(),
2105                   "error:  invalid argument combination.\n"
2106                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2107                   "selected in order\nto use CMSIncrementalMode.\n");
2108       status = false;
2109     } else {
2110       status = status && verify_percentage(CMSIncrementalDutyCycle,
2111                                   "CMSIncrementalDutyCycle");
2112       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2113                                   "CMSIncrementalDutyCycleMin");
2114       status = status && verify_percentage(CMSIncrementalSafetyFactor,
2115                                   "CMSIncrementalSafetyFactor");
2116       status = status && verify_percentage(CMSIncrementalOffset,
2117                                   "CMSIncrementalOffset");
2118       status = status && verify_percentage(CMSExpAvgFactor,
2119                                   "CMSExpAvgFactor");
2120       // If it was not set on the command line, set
2121       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2122       if (CMSInitiatingOccupancyFraction < 0) {
2123         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2124       }
2125     }
2126   }
2127 
2128   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2129   // insists that we hold the requisite locks so that the iteration is
2130   // MT-safe. For the verification at start-up and shut-down, we don't
2131   // yet have a good way of acquiring and releasing these locks,
2132   // which are not visible at the CollectedHeap level. We want to
2133   // be able to acquire these locks and then do the iteration rather
2134   // than just disable the lock verification. This will be fixed under
2135   // bug 4788986.
2136   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2137     if (VerifyDuringStartup) {
2138       warning("Heap verification at start-up disabled "
2139               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2140       VerifyDuringStartup = false; // Disable verification at start-up
2141     }
2142 
2143     if (VerifyBeforeExit) {
2144       warning("Heap verification at shutdown disabled "
2145               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2146       VerifyBeforeExit = false; // Disable verification at shutdown
2147     }
2148   }
2149 
2150   // Note: only executed in non-PRODUCT mode
2151   if (!UseAsyncConcMarkSweepGC &&
2152       (ExplicitGCInvokesConcurrent ||
2153        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2154     jio_fprintf(defaultStream::error_stream(),
2155                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2156                 " with -UseAsyncConcMarkSweepGC");
2157     status = false;
2158   }
2159 
2160   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2161 
2162 #if INCLUDE_ALL_GCS
2163   if (UseG1GC) {
2164     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2165                                          "InitiatingHeapOccupancyPercent");
2166     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2167                                         "G1RefProcDrainInterval");
2168     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2169                                         "G1ConcMarkStepDurationMillis");
2170     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2171                                        "G1ConcRSHotCardLimit");
2172     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2173                                        "G1ConcRSLogCacheSize");
2174   }
2175   if (UseConcMarkSweepGC) {
2176     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2177     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2178     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2179     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2180 
2181     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2182 
2183     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2184     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2185     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2186 
2187     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2188 
2189     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2190     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2191 
2192     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2193     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2194     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2195 
2196     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2197 
2198     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2199 
2200     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2201     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2202     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2203     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2204     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2205   }
2206 
2207   if (UseParallelGC || UseParallelOldGC) {
2208     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2209     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2210 
2211     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2212     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2213 
2214     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2215     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2216 
2217     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2218 
2219     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2220   }
2221 #endif // INCLUDE_ALL_GCS
2222 
2223   status = status && verify_interval(RefDiscoveryPolicy,
2224                                      ReferenceProcessor::DiscoveryPolicyMin,
2225                                      ReferenceProcessor::DiscoveryPolicyMax,
2226                                      "RefDiscoveryPolicy");
2227 
2228   // Limit the lower bound of this flag to 1 as it is used in a division
2229   // expression.
2230   status = status && verify_interval(TLABWasteTargetPercent,
2231                                      1, 100, "TLABWasteTargetPercent");
2232 
2233   status = status && verify_object_alignment();
2234 
2235   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2236                                       "CompressedClassSpaceSize");
2237 
2238   status = status && verify_interval(MarkStackSizeMax,
2239                                   1, (max_jint - 1), "MarkStackSizeMax");
2240   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2241 
2242   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2243 
2244   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2245 
2246   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2247 
2248   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2249   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2250 
2251   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2252 
2253   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2254   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2255   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2256   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2257 
2258   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2259   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2260 
2261   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2262   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2263   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2264 
2265   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2266   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2267 
2268   // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2269   // just for that, so hardcode here.
2270   status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2271   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2272   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2273   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2274 
2275   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2276 #ifdef SPARC
2277   if (UseConcMarkSweepGC || UseG1GC) {
2278     // Issue a stern warning if the user has explicitly set
2279     // UseMemSetInBOT (it is known to cause issues), but allow
2280     // use for experimentation and debugging.
2281     if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2282       assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2283       warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2284           " on sun4v; please understand that you are using at your own risk!");
2285     }
2286   }
2287 #endif // SPARC
2288 
2289   if (PrintNMTStatistics) {
2290 #if INCLUDE_NMT
2291     if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2292 #endif // INCLUDE_NMT
2293       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2294       PrintNMTStatistics = false;
2295 #if INCLUDE_NMT
2296     }
2297 #endif
2298   }
2299 
2300   // Need to limit the extent of the padding to reasonable size.
2301   // 8K is well beyond the reasonable HW cache line size, even with the
2302   // aggressive prefetching, while still leaving the room for segregating
2303   // among the distinct pages.
2304   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2305     jio_fprintf(defaultStream::error_stream(),
2306                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2307                 ContendedPaddingWidth, 0, 8192);
2308     status = false;
2309   }
2310 
2311   // Need to enforce the padding not to break the existing field alignments.
2312   // It is sufficient to check against the largest type size.
2313   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2314     jio_fprintf(defaultStream::error_stream(),
2315                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2316                 ContendedPaddingWidth, BytesPerLong);
2317     status = false;
2318   }
2319 
2320   // Check lower bounds of the code cache
2321   // Template Interpreter code is approximately 3X larger in debug builds.
2322   uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2323   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2324     jio_fprintf(defaultStream::error_stream(),
2325                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2326                 os::vm_page_size()/K);
2327     status = false;
2328   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2329     jio_fprintf(defaultStream::error_stream(),
2330                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2331                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2332     status = false;
2333   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2334     jio_fprintf(defaultStream::error_stream(),
2335                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2336                 min_code_cache_size/K);
2337     status = false;
2338   } else if (ReservedCodeCacheSize > 2*G) {
2339     // Code cache size larger than MAXINT is not supported.
2340     jio_fprintf(defaultStream::error_stream(),
2341                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2342                 (2*G)/M);
2343     status = false;
2344   } else if ((!FLAG_IS_DEFAULT(NonProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize))
2345       && (NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2346     jio_fprintf(defaultStream::error_stream(),
2347                 "Invalid NonProfiledCodeHeapSize + ProfiledCodeHeapSize = %dM. Must be equal to ReservedCodeCacheSize = %dM.\n",
2348                 (NonProfiledCodeHeapSize + ProfiledCodeHeapSize)/M, ReservedCodeCacheSize/M);
2349     status = false;
2350   }
2351 
2352   status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2353   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2354 
2355   return status;
2356 }
2357 
2358 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2359   const char* option_type) {
2360   if (ignore) return false;
2361 
2362   const char* spacer = " ";
2363   if (option_type == NULL) {
2364     option_type = ++spacer; // Set both to the empty string.
2365   }
2366 
2367   if (os::obsolete_option(option)) {
2368     jio_fprintf(defaultStream::error_stream(),
2369                 "Obsolete %s%soption: %s\n", option_type, spacer,
2370       option->optionString);
2371     return false;
2372   } else {
2373     jio_fprintf(defaultStream::error_stream(),
2374                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2375       option->optionString);
2376     return true;
2377   }
2378 }
2379 
2380 static const char* user_assertion_options[] = {
2381   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2382 };
2383 
2384 static const char* system_assertion_options[] = {
2385   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2386 };
2387 
2388 // Return true if any of the strings in null-terminated array 'names' matches.
2389 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2390 // the option must match exactly.
2391 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2392   bool tail_allowed) {
2393   for (/* empty */; *names != NULL; ++names) {
2394     if (match_option(option, *names, tail)) {
2395       if (**tail == '\0' || tail_allowed && **tail == ':') {
2396         return true;
2397       }
2398     }
2399   }
2400   return false;
2401 }
2402 
2403 bool Arguments::parse_uintx(const char* value,
2404                             uintx* uintx_arg,
2405                             uintx min_size) {
2406 
2407   // Check the sign first since atomull() parses only unsigned values.
2408   bool value_is_positive = !(*value == '-');
2409 
2410   if (value_is_positive) {
2411     julong n;
2412     bool good_return = atomull(value, &n);
2413     if (good_return) {
2414       bool above_minimum = n >= min_size;
2415       bool value_is_too_large = n > max_uintx;
2416 
2417       if (above_minimum && !value_is_too_large) {
2418         *uintx_arg = n;
2419         return true;
2420       }
2421     }
2422   }
2423   return false;
2424 }
2425 
2426 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2427                                                   julong* long_arg,
2428                                                   julong min_size) {
2429   if (!atomull(s, long_arg)) return arg_unreadable;
2430   return check_memory_size(*long_arg, min_size);
2431 }
2432 
2433 // Parse JavaVMInitArgs structure
2434 
2435 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2436   // For components of the system classpath.
2437   SysClassPath scp(Arguments::get_sysclasspath());
2438   bool scp_assembly_required = false;
2439 
2440   // Save default settings for some mode flags
2441   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2442   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2443   Arguments::_ClipInlining             = ClipInlining;
2444   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2445 
2446   // Setup flags for mixed which is the default
2447   set_mode_flags(_mixed);
2448 
2449   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2450   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2451   if (result != JNI_OK) {
2452     return result;
2453   }
2454 
2455   // Parse JavaVMInitArgs structure passed in
2456   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2457   if (result != JNI_OK) {
2458     return result;
2459   }
2460 
2461   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2462   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2463   if (result != JNI_OK) {
2464     return result;
2465   }
2466 
2467   // Do final processing now that all arguments have been parsed
2468   result = finalize_vm_init_args(&scp, scp_assembly_required);
2469   if (result != JNI_OK) {
2470     return result;
2471   }
2472 
2473   return JNI_OK;
2474 }
2475 
2476 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2477 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2478 // are dealing with -agentpath (case where name is a path), otherwise with
2479 // -agentlib
2480 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2481   char *_name;
2482   const char *_hprof = "hprof", *_jdwp = "jdwp";
2483   size_t _len_hprof, _len_jdwp, _len_prefix;
2484 
2485   if (is_path) {
2486     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2487       return false;
2488     }
2489 
2490     _name++;  // skip past last path separator
2491     _len_prefix = strlen(JNI_LIB_PREFIX);
2492 
2493     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2494       return false;
2495     }
2496 
2497     _name += _len_prefix;
2498     _len_hprof = strlen(_hprof);
2499     _len_jdwp = strlen(_jdwp);
2500 
2501     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2502       _name += _len_hprof;
2503     }
2504     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2505       _name += _len_jdwp;
2506     }
2507     else {
2508       return false;
2509     }
2510 
2511     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2512       return false;
2513     }
2514 
2515     return true;
2516   }
2517 
2518   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2519     return true;
2520   }
2521 
2522   return false;
2523 }
2524 
2525 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2526                                        SysClassPath* scp_p,
2527                                        bool* scp_assembly_required_p,
2528                                        Flag::Flags origin) {
2529   // Remaining part of option string
2530   const char* tail;
2531 
2532   // iterate over arguments
2533   for (int index = 0; index < args->nOptions; index++) {
2534     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2535 
2536     const JavaVMOption* option = args->options + index;
2537 
2538     if (!match_option(option, "-Djava.class.path", &tail) &&
2539         !match_option(option, "-Dsun.java.command", &tail) &&
2540         !match_option(option, "-Dsun.java.launcher", &tail)) {
2541 
2542         // add all jvm options to the jvm_args string. This string
2543         // is used later to set the java.vm.args PerfData string constant.
2544         // the -Djava.class.path and the -Dsun.java.command options are
2545         // omitted from jvm_args string as each have their own PerfData
2546         // string constant object.
2547         build_jvm_args(option->optionString);
2548     }
2549 
2550     // -verbose:[class/gc/jni]
2551     if (match_option(option, "-verbose", &tail)) {
2552       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2553         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2554         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2555       } else if (!strcmp(tail, ":gc")) {
2556         FLAG_SET_CMDLINE(bool, PrintGC, true);
2557       } else if (!strcmp(tail, ":jni")) {
2558         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2559       }
2560     // -da / -ea / -disableassertions / -enableassertions
2561     // These accept an optional class/package name separated by a colon, e.g.,
2562     // -da:java.lang.Thread.
2563     } else if (match_option(option, user_assertion_options, &tail, true)) {
2564       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2565       if (*tail == '\0') {
2566         JavaAssertions::setUserClassDefault(enable);
2567       } else {
2568         assert(*tail == ':', "bogus match by match_option()");
2569         JavaAssertions::addOption(tail + 1, enable);
2570       }
2571     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2572     } else if (match_option(option, system_assertion_options, &tail, false)) {
2573       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2574       JavaAssertions::setSystemClassDefault(enable);
2575     // -bootclasspath:
2576     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2577       scp_p->reset_path(tail);
2578       *scp_assembly_required_p = true;
2579     // -bootclasspath/a:
2580     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2581       scp_p->add_suffix(tail);
2582       *scp_assembly_required_p = true;
2583     // -bootclasspath/p:
2584     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2585       scp_p->add_prefix(tail);
2586       *scp_assembly_required_p = true;
2587     // -Xrun
2588     } else if (match_option(option, "-Xrun", &tail)) {
2589       if (tail != NULL) {
2590         const char* pos = strchr(tail, ':');
2591         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2592         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2593         name[len] = '\0';
2594 
2595         char *options = NULL;
2596         if(pos != NULL) {
2597           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2598           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2599         }
2600 #if !INCLUDE_JVMTI
2601         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2602           jio_fprintf(defaultStream::error_stream(),
2603             "Profiling and debugging agents are not supported in this VM\n");
2604           return JNI_ERR;
2605         }
2606 #endif // !INCLUDE_JVMTI
2607         add_init_library(name, options);
2608       }
2609     // -agentlib and -agentpath
2610     } else if (match_option(option, "-agentlib:", &tail) ||
2611           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2612       if(tail != NULL) {
2613         const char* pos = strchr(tail, '=');
2614         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2615         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2616         name[len] = '\0';
2617 
2618         char *options = NULL;
2619         if(pos != NULL) {
2620           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2621         }
2622 #if !INCLUDE_JVMTI
2623         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2624           jio_fprintf(defaultStream::error_stream(),
2625             "Profiling and debugging agents are not supported in this VM\n");
2626           return JNI_ERR;
2627         }
2628 #endif // !INCLUDE_JVMTI
2629         add_init_agent(name, options, is_absolute_path);
2630       }
2631     // -javaagent
2632     } else if (match_option(option, "-javaagent:", &tail)) {
2633 #if !INCLUDE_JVMTI
2634       jio_fprintf(defaultStream::error_stream(),
2635         "Instrumentation agents are not supported in this VM\n");
2636       return JNI_ERR;
2637 #else
2638       if(tail != NULL) {
2639         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2640         add_init_agent("instrument", options, false);
2641       }
2642 #endif // !INCLUDE_JVMTI
2643     // -Xnoclassgc
2644     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2645       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2646     // -Xincgc: i-CMS
2647     } else if (match_option(option, "-Xincgc", &tail)) {
2648       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2649       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2650     // -Xnoincgc: no i-CMS
2651     } else if (match_option(option, "-Xnoincgc", &tail)) {
2652       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2653       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2654     // -Xconcgc
2655     } else if (match_option(option, "-Xconcgc", &tail)) {
2656       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2657     // -Xnoconcgc
2658     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2659       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2660     // -Xbatch
2661     } else if (match_option(option, "-Xbatch", &tail)) {
2662       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2663     // -Xmn for compatibility with other JVM vendors
2664     } else if (match_option(option, "-Xmn", &tail)) {
2665       julong long_initial_eden_size = 0;
2666       ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2667       if (errcode != arg_in_range) {
2668         jio_fprintf(defaultStream::error_stream(),
2669                     "Invalid initial eden size: %s\n", option->optionString);
2670         describe_range_error(errcode);
2671         return JNI_EINVAL;
2672       }
2673       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2674       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2675     // -Xms
2676     } else if (match_option(option, "-Xms", &tail)) {
2677       julong long_initial_heap_size = 0;
2678       // an initial heap size of 0 means automatically determine
2679       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2680       if (errcode != arg_in_range) {
2681         jio_fprintf(defaultStream::error_stream(),
2682                     "Invalid initial heap size: %s\n", option->optionString);
2683         describe_range_error(errcode);
2684         return JNI_EINVAL;
2685       }
2686       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2687       // Currently the minimum size and the initial heap sizes are the same.
2688       set_min_heap_size(InitialHeapSize);
2689     // -Xmx
2690     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2691       julong long_max_heap_size = 0;
2692       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2693       if (errcode != arg_in_range) {
2694         jio_fprintf(defaultStream::error_stream(),
2695                     "Invalid maximum heap size: %s\n", option->optionString);
2696         describe_range_error(errcode);
2697         return JNI_EINVAL;
2698       }
2699       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2700     // Xmaxf
2701     } else if (match_option(option, "-Xmaxf", &tail)) {
2702       int maxf = (int)(atof(tail) * 100);
2703       if (maxf < 0 || maxf > 100) {
2704         jio_fprintf(defaultStream::error_stream(),
2705                     "Bad max heap free percentage size: %s\n",
2706                     option->optionString);
2707         return JNI_EINVAL;
2708       } else {
2709         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2710       }
2711     // Xminf
2712     } else if (match_option(option, "-Xminf", &tail)) {
2713       int minf = (int)(atof(tail) * 100);
2714       if (minf < 0 || minf > 100) {
2715         jio_fprintf(defaultStream::error_stream(),
2716                     "Bad min heap free percentage size: %s\n",
2717                     option->optionString);
2718         return JNI_EINVAL;
2719       } else {
2720         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2721       }
2722     // -Xss
2723     } else if (match_option(option, "-Xss", &tail)) {
2724       julong long_ThreadStackSize = 0;
2725       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2726       if (errcode != arg_in_range) {
2727         jio_fprintf(defaultStream::error_stream(),
2728                     "Invalid thread stack size: %s\n", option->optionString);
2729         describe_range_error(errcode);
2730         return JNI_EINVAL;
2731       }
2732       // Internally track ThreadStackSize in units of 1024 bytes.
2733       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2734                               round_to((int)long_ThreadStackSize, K) / K);
2735     // -Xoss
2736     } else if (match_option(option, "-Xoss", &tail)) {
2737           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2738     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2739       julong long_CodeCacheExpansionSize = 0;
2740       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2741       if (errcode != arg_in_range) {
2742         jio_fprintf(defaultStream::error_stream(),
2743                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2744                    os::vm_page_size()/K);
2745         return JNI_EINVAL;
2746       }
2747       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2748     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2749                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2750       julong long_ReservedCodeCacheSize = 0;
2751 
2752       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2753       if (errcode != arg_in_range) {
2754         jio_fprintf(defaultStream::error_stream(),
2755                     "Invalid maximum code cache size: %s.\n", option->optionString);
2756         return JNI_EINVAL;
2757       }
2758       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2759     // -XX:ProfiledCodeHeapSize=
2760     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2761       julong long_ProfiledCodeHeapSize = 0;
2762 
2763       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2764       if (errcode != arg_in_range) {
2765         jio_fprintf(defaultStream::error_stream(),
2766                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2767         return JNI_EINVAL;
2768       }
2769       FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2770       // -XX:NonProfiledCodeHeapSizee=
2771     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2772       julong long_NonProfiledCodeHeapSize = 0;
2773 
2774       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2775       if (errcode != arg_in_range) {
2776         jio_fprintf(defaultStream::error_stream(),
2777                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2778         return JNI_EINVAL;
2779       }
2780       FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2781       //-XX:IncreaseFirstTierCompileThresholdAt=
2782     } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2783         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2784         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2785           jio_fprintf(defaultStream::error_stream(),
2786                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2787                       option->optionString);
2788           return JNI_EINVAL;
2789         }
2790         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2791     // -green
2792     } else if (match_option(option, "-green", &tail)) {
2793       jio_fprintf(defaultStream::error_stream(),
2794                   "Green threads support not available\n");
2795           return JNI_EINVAL;
2796     // -native
2797     } else if (match_option(option, "-native", &tail)) {
2798           // HotSpot always uses native threads, ignore silently for compatibility
2799     // -Xsqnopause
2800     } else if (match_option(option, "-Xsqnopause", &tail)) {
2801           // EVM option, ignore silently for compatibility
2802     // -Xrs
2803     } else if (match_option(option, "-Xrs", &tail)) {
2804           // Classic/EVM option, new functionality
2805       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2806     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2807           // change default internal VM signals used - lower case for back compat
2808       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2809     // -Xoptimize
2810     } else if (match_option(option, "-Xoptimize", &tail)) {
2811           // EVM option, ignore silently for compatibility
2812     // -Xprof
2813     } else if (match_option(option, "-Xprof", &tail)) {
2814 #if INCLUDE_FPROF
2815       _has_profile = true;
2816 #else // INCLUDE_FPROF
2817       jio_fprintf(defaultStream::error_stream(),
2818         "Flat profiling is not supported in this VM.\n");
2819       return JNI_ERR;
2820 #endif // INCLUDE_FPROF
2821     // -Xconcurrentio
2822     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2823       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2824       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2825       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2826       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2827       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2828 
2829       // -Xinternalversion
2830     } else if (match_option(option, "-Xinternalversion", &tail)) {
2831       jio_fprintf(defaultStream::output_stream(), "%s\n",
2832                   VM_Version::internal_vm_info_string());
2833       vm_exit(0);
2834 #ifndef PRODUCT
2835     // -Xprintflags
2836     } else if (match_option(option, "-Xprintflags", &tail)) {
2837       CommandLineFlags::printFlags(tty, false);
2838       vm_exit(0);
2839 #endif
2840     // -D
2841     } else if (match_option(option, "-D", &tail)) {
2842       if (!add_property(tail)) {
2843         return JNI_ENOMEM;
2844       }
2845       // Out of the box management support
2846       if (match_option(option, "-Dcom.sun.management", &tail)) {
2847 #if INCLUDE_MANAGEMENT
2848         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2849 #else
2850         jio_fprintf(defaultStream::output_stream(),
2851           "-Dcom.sun.management is not supported in this VM.\n");
2852         return JNI_ERR;
2853 #endif
2854       }
2855     // -Xint
2856     } else if (match_option(option, "-Xint", &tail)) {
2857           set_mode_flags(_int);
2858     // -Xmixed
2859     } else if (match_option(option, "-Xmixed", &tail)) {
2860           set_mode_flags(_mixed);
2861     // -Xcomp
2862     } else if (match_option(option, "-Xcomp", &tail)) {
2863       // for testing the compiler; turn off all flags that inhibit compilation
2864           set_mode_flags(_comp);
2865     // -Xshare:dump
2866     } else if (match_option(option, "-Xshare:dump", &tail)) {
2867       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2868       set_mode_flags(_int);     // Prevent compilation, which creates objects
2869     // -Xshare:on
2870     } else if (match_option(option, "-Xshare:on", &tail)) {
2871       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2872       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2873     // -Xshare:auto
2874     } else if (match_option(option, "-Xshare:auto", &tail)) {
2875       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2876       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2877     // -Xshare:off
2878     } else if (match_option(option, "-Xshare:off", &tail)) {
2879       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2880       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2881     // -Xverify
2882     } else if (match_option(option, "-Xverify", &tail)) {
2883       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2884         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2885         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2886       } else if (strcmp(tail, ":remote") == 0) {
2887         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2888         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2889       } else if (strcmp(tail, ":none") == 0) {
2890         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2891         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2892       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2893         return JNI_EINVAL;
2894       }
2895     // -Xdebug
2896     } else if (match_option(option, "-Xdebug", &tail)) {
2897       // note this flag has been used, then ignore
2898       set_xdebug_mode(true);
2899     // -Xnoagent
2900     } else if (match_option(option, "-Xnoagent", &tail)) {
2901       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2902     } else if (match_option(option, "-Xboundthreads", &tail)) {
2903       // Bind user level threads to kernel threads (Solaris only)
2904       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2905     } else if (match_option(option, "-Xloggc:", &tail)) {
2906       // Redirect GC output to the file. -Xloggc:<filename>
2907       // ostream_init_log(), when called will use this filename
2908       // to initialize a fileStream.
2909       _gc_log_filename = strdup(tail);
2910      if (!is_filename_valid(_gc_log_filename)) {
2911        jio_fprintf(defaultStream::output_stream(),
2912                   "Invalid file name for use with -Xloggc: Filename can only contain the "
2913                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2914                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
2915         return JNI_EINVAL;
2916       }
2917       FLAG_SET_CMDLINE(bool, PrintGC, true);
2918       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2919 
2920     // JNI hooks
2921     } else if (match_option(option, "-Xcheck", &tail)) {
2922       if (!strcmp(tail, ":jni")) {
2923 #if !INCLUDE_JNI_CHECK
2924         warning("JNI CHECKING is not supported in this VM");
2925 #else
2926         CheckJNICalls = true;
2927 #endif // INCLUDE_JNI_CHECK
2928       } else if (is_bad_option(option, args->ignoreUnrecognized,
2929                                      "check")) {
2930         return JNI_EINVAL;
2931       }
2932     } else if (match_option(option, "vfprintf", &tail)) {
2933       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2934     } else if (match_option(option, "exit", &tail)) {
2935       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2936     } else if (match_option(option, "abort", &tail)) {
2937       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2938     // -XX:+AggressiveHeap
2939     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2940 
2941       // This option inspects the machine and attempts to set various
2942       // parameters to be optimal for long-running, memory allocation
2943       // intensive jobs.  It is intended for machines with large
2944       // amounts of cpu and memory.
2945 
2946       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2947       // VM, but we may not be able to represent the total physical memory
2948       // available (like having 8gb of memory on a box but using a 32bit VM).
2949       // Thus, we need to make sure we're using a julong for intermediate
2950       // calculations.
2951       julong initHeapSize;
2952       julong total_memory = os::physical_memory();
2953 
2954       if (total_memory < (julong)256*M) {
2955         jio_fprintf(defaultStream::error_stream(),
2956                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2957         vm_exit(1);
2958       }
2959 
2960       // The heap size is half of available memory, or (at most)
2961       // all of possible memory less 160mb (leaving room for the OS
2962       // when using ISM).  This is the maximum; because adaptive sizing
2963       // is turned on below, the actual space used may be smaller.
2964 
2965       initHeapSize = MIN2(total_memory / (julong)2,
2966                           total_memory - (julong)160*M);
2967 
2968       initHeapSize = limit_by_allocatable_memory(initHeapSize);
2969 
2970       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2971          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2972          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2973          // Currently the minimum size and the initial heap sizes are the same.
2974          set_min_heap_size(initHeapSize);
2975       }
2976       if (FLAG_IS_DEFAULT(NewSize)) {
2977          // Make the young generation 3/8ths of the total heap.
2978          FLAG_SET_CMDLINE(uintx, NewSize,
2979                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2980          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2981       }
2982 
2983 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
2984       FLAG_SET_DEFAULT(UseLargePages, true);
2985 #endif
2986 
2987       // Increase some data structure sizes for efficiency
2988       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2989       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2990       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2991 
2992       // See the OldPLABSize comment below, but replace 'after promotion'
2993       // with 'after copying'.  YoungPLABSize is the size of the survivor
2994       // space per-gc-thread buffers.  The default is 4kw.
2995       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
2996 
2997       // OldPLABSize is the size of the buffers in the old gen that
2998       // UseParallelGC uses to promote live data that doesn't fit in the
2999       // survivor spaces.  At any given time, there's one for each gc thread.
3000       // The default size is 1kw. These buffers are rarely used, since the
3001       // survivor spaces are usually big enough.  For specjbb, however, there
3002       // are occasions when there's lots of live data in the young gen
3003       // and we end up promoting some of it.  We don't have a definite
3004       // explanation for why bumping OldPLABSize helps, but the theory
3005       // is that a bigger PLAB results in retaining something like the
3006       // original allocation order after promotion, which improves mutator
3007       // locality.  A minor effect may be that larger PLABs reduce the
3008       // number of PLAB allocation events during gc.  The value of 8kw
3009       // was arrived at by experimenting with specjbb.
3010       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
3011 
3012       // Enable parallel GC and adaptive generation sizing
3013       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3014       FLAG_SET_DEFAULT(ParallelGCThreads,
3015                        Abstract_VM_Version::parallel_worker_threads());
3016 
3017       // Encourage steady state memory management
3018       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3019 
3020       // This appears to improve mutator locality
3021       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3022 
3023       // Get around early Solaris scheduling bug
3024       // (affinity vs other jobs on system)
3025       // but disallow DR and offlining (5008695).
3026       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3027 
3028     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3029       // The last option must always win.
3030       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3031       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3032     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3033       // The last option must always win.
3034       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3035       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3036     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3037                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3038       jio_fprintf(defaultStream::error_stream(),
3039         "Please use CMSClassUnloadingEnabled in place of "
3040         "CMSPermGenSweepingEnabled in the future\n");
3041     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3042       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3043       jio_fprintf(defaultStream::error_stream(),
3044         "Please use -XX:+UseGCOverheadLimit in place of "
3045         "-XX:+UseGCTimeLimit in the future\n");
3046     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3047       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3048       jio_fprintf(defaultStream::error_stream(),
3049         "Please use -XX:-UseGCOverheadLimit in place of "
3050         "-XX:-UseGCTimeLimit in the future\n");
3051     // The TLE options are for compatibility with 1.3 and will be
3052     // removed without notice in a future release.  These options
3053     // are not to be documented.
3054     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3055       // No longer used.
3056     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3057       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3058     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3059       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3060     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3061       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3062     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3063       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3064     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3065       // No longer used.
3066     } else if (match_option(option, "-XX:TLESize=", &tail)) {
3067       julong long_tlab_size = 0;
3068       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3069       if (errcode != arg_in_range) {
3070         jio_fprintf(defaultStream::error_stream(),
3071                     "Invalid TLAB size: %s\n", option->optionString);
3072         describe_range_error(errcode);
3073         return JNI_EINVAL;
3074       }
3075       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3076     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3077       // No longer used.
3078     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3079       FLAG_SET_CMDLINE(bool, UseTLAB, true);
3080     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3081       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3082     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3083       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3084       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3085     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3086       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3087       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3088     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3089 #if defined(DTRACE_ENABLED)
3090       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3091       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3092       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3093       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3094 #else // defined(DTRACE_ENABLED)
3095       jio_fprintf(defaultStream::error_stream(),
3096                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3097       return JNI_EINVAL;
3098 #endif // defined(DTRACE_ENABLED)
3099 #ifdef ASSERT
3100     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3101       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3102       // disable scavenge before parallel mark-compact
3103       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3104 #endif
3105     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3106       julong cms_blocks_to_claim = (julong)atol(tail);
3107       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3108       jio_fprintf(defaultStream::error_stream(),
3109         "Please use -XX:OldPLABSize in place of "
3110         "-XX:CMSParPromoteBlocksToClaim in the future\n");
3111     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3112       julong cms_blocks_to_claim = (julong)atol(tail);
3113       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3114       jio_fprintf(defaultStream::error_stream(),
3115         "Please use -XX:OldPLABSize in place of "
3116         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3117     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3118       julong old_plab_size = 0;
3119       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3120       if (errcode != arg_in_range) {
3121         jio_fprintf(defaultStream::error_stream(),
3122                     "Invalid old PLAB size: %s\n", option->optionString);
3123         describe_range_error(errcode);
3124         return JNI_EINVAL;
3125       }
3126       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3127       jio_fprintf(defaultStream::error_stream(),
3128                   "Please use -XX:OldPLABSize in place of "
3129                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3130     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3131       julong young_plab_size = 0;
3132       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3133       if (errcode != arg_in_range) {
3134         jio_fprintf(defaultStream::error_stream(),
3135                     "Invalid young PLAB size: %s\n", option->optionString);
3136         describe_range_error(errcode);
3137         return JNI_EINVAL;
3138       }
3139       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3140       jio_fprintf(defaultStream::error_stream(),
3141                   "Please use -XX:YoungPLABSize in place of "
3142                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3143     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3144                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3145       julong stack_size = 0;
3146       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3147       if (errcode != arg_in_range) {
3148         jio_fprintf(defaultStream::error_stream(),
3149                     "Invalid mark stack size: %s\n", option->optionString);
3150         describe_range_error(errcode);
3151         return JNI_EINVAL;
3152       }
3153       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3154     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3155       julong max_stack_size = 0;
3156       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3157       if (errcode != arg_in_range) {
3158         jio_fprintf(defaultStream::error_stream(),
3159                     "Invalid maximum mark stack size: %s\n",
3160                     option->optionString);
3161         describe_range_error(errcode);
3162         return JNI_EINVAL;
3163       }
3164       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3165     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3166                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3167       uintx conc_threads = 0;
3168       if (!parse_uintx(tail, &conc_threads, 1)) {
3169         jio_fprintf(defaultStream::error_stream(),
3170                     "Invalid concurrent threads: %s\n", option->optionString);
3171         return JNI_EINVAL;
3172       }
3173       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3174     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3175       julong max_direct_memory_size = 0;
3176       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3177       if (errcode != arg_in_range) {
3178         jio_fprintf(defaultStream::error_stream(),
3179                     "Invalid maximum direct memory size: %s\n",
3180                     option->optionString);
3181         describe_range_error(errcode);
3182         return JNI_EINVAL;
3183       }
3184       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3185     } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3186       // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3187       //       away and will cause VM initialization failures!
3188       warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3189       FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3190 #if !INCLUDE_MANAGEMENT
3191     } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3192         jio_fprintf(defaultStream::error_stream(),
3193           "ManagementServer is not supported in this VM.\n");
3194         return JNI_ERR;
3195 #endif // INCLUDE_MANAGEMENT
3196     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3197       // Skip -XX:Flags= since that case has already been handled
3198       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3199         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3200           return JNI_EINVAL;
3201         }
3202       }
3203     // Unknown option
3204     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3205       return JNI_ERR;
3206     }
3207   }
3208 
3209   // Change the default value for flags  which have different default values
3210   // when working with older JDKs.
3211 #ifdef LINUX
3212  if (JDK_Version::current().compare_major(6) <= 0 &&
3213       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3214     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3215   }
3216 #endif // LINUX
3217   return JNI_OK;
3218 }
3219 
3220 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3221   // This must be done after all -D arguments have been processed.
3222   scp_p->expand_endorsed();
3223 
3224   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3225     // Assemble the bootclasspath elements into the final path.
3226     Arguments::set_sysclasspath(scp_p->combined_path());
3227   }
3228 
3229   // This must be done after all arguments have been processed.
3230   // java_compiler() true means set to "NONE" or empty.
3231   if (java_compiler() && !xdebug_mode()) {
3232     // For backwards compatibility, we switch to interpreted mode if
3233     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3234     // not specified.
3235     set_mode_flags(_int);
3236   }
3237   if (CompileThreshold == 0) {
3238     set_mode_flags(_int);
3239   }
3240 
3241   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3242   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3243     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3244   }
3245 
3246 #ifndef COMPILER2
3247   // Don't degrade server performance for footprint
3248   if (FLAG_IS_DEFAULT(UseLargePages) &&
3249       MaxHeapSize < LargePageHeapSizeThreshold) {
3250     // No need for large granularity pages w/small heaps.
3251     // Note that large pages are enabled/disabled for both the
3252     // Java heap and the code cache.
3253     FLAG_SET_DEFAULT(UseLargePages, false);
3254   }
3255 
3256 #else
3257   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3258     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3259   }
3260 #endif
3261 
3262 #ifndef TIERED
3263   // Tiered compilation is undefined.
3264   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3265 #endif
3266 
3267   // If we are running in a headless jre, force java.awt.headless property
3268   // to be true unless the property has already been set.
3269   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3270   if (os::is_headless_jre()) {
3271     const char* headless = Arguments::get_property("java.awt.headless");
3272     if (headless == NULL) {
3273       char envbuffer[128];
3274       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3275         if (!add_property("java.awt.headless=true")) {
3276           return JNI_ENOMEM;
3277         }
3278       } else {
3279         char buffer[256];
3280         strcpy(buffer, "java.awt.headless=");
3281         strcat(buffer, envbuffer);
3282         if (!add_property(buffer)) {
3283           return JNI_ENOMEM;
3284         }
3285       }
3286     }
3287   }
3288 
3289   if (!check_vm_args_consistency()) {
3290     return JNI_ERR;
3291   }
3292 
3293   return JNI_OK;
3294 }
3295 
3296 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3297   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3298                                             scp_assembly_required_p);
3299 }
3300 
3301 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3302   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3303                                             scp_assembly_required_p);
3304 }
3305 
3306 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3307   const int N_MAX_OPTIONS = 64;
3308   const int OPTION_BUFFER_SIZE = 1024;
3309   char buffer[OPTION_BUFFER_SIZE];
3310 
3311   // The variable will be ignored if it exceeds the length of the buffer.
3312   // Don't check this variable if user has special privileges
3313   // (e.g. unix su command).
3314   if (os::getenv(name, buffer, sizeof(buffer)) &&
3315       !os::have_special_privileges()) {
3316     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3317     jio_fprintf(defaultStream::error_stream(),
3318                 "Picked up %s: %s\n", name, buffer);
3319     char* rd = buffer;                        // pointer to the input string (rd)
3320     int i;
3321     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3322       while (isspace(*rd)) rd++;              // skip whitespace
3323       if (*rd == 0) break;                    // we re done when the input string is read completely
3324 
3325       // The output, option string, overwrites the input string.
3326       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3327       // input string (rd).
3328       char* wrt = rd;
3329 
3330       options[i++].optionString = wrt;        // Fill in option
3331       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3332         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3333           int quote = *rd;                    // matching quote to look for
3334           rd++;                               // don't copy open quote
3335           while (*rd != quote) {              // include everything (even spaces) up until quote
3336             if (*rd == 0) {                   // string termination means unmatched string
3337               jio_fprintf(defaultStream::error_stream(),
3338                           "Unmatched quote in %s\n", name);
3339               return JNI_ERR;
3340             }
3341             *wrt++ = *rd++;                   // copy to option string
3342           }
3343           rd++;                               // don't copy close quote
3344         } else {
3345           *wrt++ = *rd++;                     // copy to option string
3346         }
3347       }
3348       // Need to check if we're done before writing a NULL,
3349       // because the write could be to the byte that rd is pointing to.
3350       if (*rd++ == 0) {
3351         *wrt = 0;
3352         break;
3353       }
3354       *wrt = 0;                               // Zero terminate option
3355     }
3356     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3357     JavaVMInitArgs vm_args;
3358     vm_args.version = JNI_VERSION_1_2;
3359     vm_args.options = options;
3360     vm_args.nOptions = i;
3361     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3362 
3363     if (PrintVMOptions) {
3364       const char* tail;
3365       for (int i = 0; i < vm_args.nOptions; i++) {
3366         const JavaVMOption *option = vm_args.options + i;
3367         if (match_option(option, "-XX:", &tail)) {
3368           logOption(tail);
3369         }
3370       }
3371     }
3372 
3373     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3374   }
3375   return JNI_OK;
3376 }
3377 
3378 void Arguments::set_shared_spaces_flags() {
3379   if (DumpSharedSpaces) {
3380     if (RequireSharedSpaces) {
3381       warning("cannot dump shared archive while using shared archive");
3382     }
3383     UseSharedSpaces = false;
3384 #ifdef _LP64
3385     if (!UseCompressedOops || !UseCompressedClassPointers) {
3386       vm_exit_during_initialization(
3387         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3388     }
3389   } else {
3390     // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3391     if (!UseCompressedOops || !UseCompressedClassPointers) {
3392       no_shared_spaces();
3393     }
3394 #endif
3395   }
3396 }
3397 
3398 #if !INCLUDE_ALL_GCS
3399 static void force_serial_gc() {
3400   FLAG_SET_DEFAULT(UseSerialGC, true);
3401   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
3402   UNSUPPORTED_GC_OPTION(UseG1GC);
3403   UNSUPPORTED_GC_OPTION(UseParallelGC);
3404   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3405   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3406   UNSUPPORTED_GC_OPTION(UseParNewGC);
3407 }
3408 #endif // INCLUDE_ALL_GCS
3409 
3410 // Sharing support
3411 // Construct the path to the archive
3412 static char* get_shared_archive_path() {
3413   char *shared_archive_path;
3414   if (SharedArchiveFile == NULL) {
3415     char jvm_path[JVM_MAXPATHLEN];
3416     os::jvm_path(jvm_path, sizeof(jvm_path));
3417     char *end = strrchr(jvm_path, *os::file_separator());
3418     if (end != NULL) *end = '\0';
3419     size_t jvm_path_len = strlen(jvm_path);
3420     size_t file_sep_len = strlen(os::file_separator());
3421     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3422         file_sep_len + 20, mtInternal);
3423     if (shared_archive_path != NULL) {
3424       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3425       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3426       strncat(shared_archive_path, "classes.jsa", 11);
3427     }
3428   } else {
3429     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3430     if (shared_archive_path != NULL) {
3431       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3432     }
3433   }
3434   return shared_archive_path;
3435 }
3436 
3437 #ifndef PRODUCT
3438 // Determine whether LogVMOutput should be implicitly turned on.
3439 static bool use_vm_log() {
3440   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3441       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3442       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3443       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3444       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3445     return true;
3446   }
3447 
3448 #ifdef COMPILER1
3449   if (PrintC1Statistics) {
3450     return true;
3451   }
3452 #endif // COMPILER1
3453 
3454 #ifdef COMPILER2
3455   if (PrintOptoAssembly || PrintOptoStatistics) {
3456     return true;
3457   }
3458 #endif // COMPILER2
3459 
3460   return false;
3461 }
3462 #endif // PRODUCT
3463 
3464 // Parse entry point called from JNI_CreateJavaVM
3465 
3466 jint Arguments::parse(const JavaVMInitArgs* args) {
3467 
3468   // Remaining part of option string
3469   const char* tail;
3470 
3471   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3472   const char* hotspotrc = ".hotspotrc";
3473   bool settings_file_specified = false;
3474   bool needs_hotspotrc_warning = false;
3475 
3476   const char* flags_file;
3477   int index;
3478   for (index = 0; index < args->nOptions; index++) {
3479     const JavaVMOption *option = args->options + index;
3480     if (match_option(option, "-XX:Flags=", &tail)) {
3481       flags_file = tail;
3482       settings_file_specified = true;
3483     }
3484     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3485       PrintVMOptions = true;
3486     }
3487     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3488       PrintVMOptions = false;
3489     }
3490     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3491       IgnoreUnrecognizedVMOptions = true;
3492     }
3493     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3494       IgnoreUnrecognizedVMOptions = false;
3495     }
3496     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3497       CommandLineFlags::printFlags(tty, false);
3498       vm_exit(0);
3499     }
3500     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3501 #if INCLUDE_NMT
3502       MemTracker::init_tracking_options(tail);
3503 #else
3504       jio_fprintf(defaultStream::error_stream(),
3505         "Native Memory Tracking is not supported in this VM\n");
3506       return JNI_ERR;
3507 #endif
3508     }
3509 
3510 
3511 #ifndef PRODUCT
3512     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3513       CommandLineFlags::printFlags(tty, true);
3514       vm_exit(0);
3515     }
3516 #endif
3517   }
3518 
3519   if (IgnoreUnrecognizedVMOptions) {
3520     // uncast const to modify the flag args->ignoreUnrecognized
3521     *(jboolean*)(&args->ignoreUnrecognized) = true;
3522   }
3523 
3524   // Parse specified settings file
3525   if (settings_file_specified) {
3526     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3527       return JNI_EINVAL;
3528     }
3529   } else {
3530 #ifdef ASSERT
3531     // Parse default .hotspotrc settings file
3532     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3533       return JNI_EINVAL;
3534     }
3535 #else
3536     struct stat buf;
3537     if (os::stat(hotspotrc, &buf) == 0) {
3538       needs_hotspotrc_warning = true;
3539     }
3540 #endif
3541   }
3542 
3543   if (PrintVMOptions) {
3544     for (index = 0; index < args->nOptions; index++) {
3545       const JavaVMOption *option = args->options + index;
3546       if (match_option(option, "-XX:", &tail)) {
3547         logOption(tail);
3548       }
3549     }
3550   }
3551 
3552   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3553   jint result = parse_vm_init_args(args);
3554   if (result != JNI_OK) {
3555     return result;
3556   }
3557 
3558   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3559   SharedArchivePath = get_shared_archive_path();
3560   if (SharedArchivePath == NULL) {
3561     return JNI_ENOMEM;
3562   }
3563 
3564   // Delay warning until here so that we've had a chance to process
3565   // the -XX:-PrintWarnings flag
3566   if (needs_hotspotrc_warning) {
3567     warning("%s file is present but has been ignored.  "
3568             "Run with -XX:Flags=%s to load the file.",
3569             hotspotrc, hotspotrc);
3570   }
3571 
3572 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3573   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3574 #endif
3575 
3576 #if INCLUDE_ALL_GCS
3577   #if (defined JAVASE_EMBEDDED || defined ARM)
3578     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3579   #endif
3580 #endif
3581 
3582 #ifndef PRODUCT
3583   if (TraceBytecodesAt != 0) {
3584     TraceBytecodes = true;
3585   }
3586   if (CountCompiledCalls) {
3587     if (UseCounterDecay) {
3588       warning("UseCounterDecay disabled because CountCalls is set");
3589       UseCounterDecay = false;
3590     }
3591   }
3592 #endif // PRODUCT
3593 
3594   // JSR 292 is not supported before 1.7
3595   if (!JDK_Version::is_gte_jdk17x_version()) {
3596     if (EnableInvokeDynamic) {
3597       if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3598         warning("JSR 292 is not supported before 1.7.  Disabling support.");
3599       }
3600       EnableInvokeDynamic = false;
3601     }
3602   }
3603 
3604   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3605     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3606       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3607     }
3608     ScavengeRootsInCode = 1;
3609   }
3610 
3611   if (PrintGCDetails) {
3612     // Turn on -verbose:gc options as well
3613     PrintGC = true;
3614   }
3615 
3616   if (!JDK_Version::is_gte_jdk18x_version()) {
3617     // To avoid changing the log format for 7 updates this flag is only
3618     // true by default in JDK8 and above.
3619     if (FLAG_IS_DEFAULT(PrintGCCause)) {
3620       FLAG_SET_DEFAULT(PrintGCCause, false);
3621     }
3622   }
3623 
3624   // Set object alignment values.
3625   set_object_alignment();
3626 
3627 #if !INCLUDE_ALL_GCS
3628   force_serial_gc();
3629 #endif // INCLUDE_ALL_GCS
3630 #if !INCLUDE_CDS
3631   if (DumpSharedSpaces || RequireSharedSpaces) {
3632     jio_fprintf(defaultStream::error_stream(),
3633       "Shared spaces are not supported in this VM\n");
3634     return JNI_ERR;
3635   }
3636   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3637     warning("Shared spaces are not supported in this VM");
3638     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3639     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3640   }
3641   no_shared_spaces();
3642 #endif // INCLUDE_CDS
3643 
3644   return JNI_OK;
3645 }
3646 
3647 jint Arguments::apply_ergo() {
3648 
3649   // Set flags based on ergonomics.
3650   set_ergonomics_flags();
3651 
3652   set_shared_spaces_flags();
3653 
3654   // Check the GC selections again.
3655   if (!check_gc_consistency()) {
3656     return JNI_EINVAL;
3657   }
3658 
3659   if (TieredCompilation) {
3660     set_tiered_flags();
3661   } else {
3662     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3663     if (CompilationPolicyChoice >= 2) {
3664       vm_exit_during_initialization(
3665         "Incompatible compilation policy selected", NULL);
3666     }
3667   }
3668 
3669   // Set heap size based on available physical memory
3670   set_heap_size();
3671 
3672 #if INCLUDE_ALL_GCS
3673   // Set per-collector flags
3674   if (UseParallelGC || UseParallelOldGC) {
3675     set_parallel_gc_flags();
3676   } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3677     set_cms_and_parnew_gc_flags();
3678   } else if (UseParNewGC) {  // skipped if CMS is set above
3679     set_parnew_gc_flags();
3680   } else if (UseG1GC) {
3681     set_g1_gc_flags();
3682   }
3683   check_deprecated_gcs();
3684   check_deprecated_gc_flags();
3685   if (AssumeMP && !UseSerialGC) {
3686     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3687       warning("If the number of processors is expected to increase from one, then"
3688               " you should configure the number of parallel GC threads appropriately"
3689               " using -XX:ParallelGCThreads=N");
3690     }
3691   }
3692 #else // INCLUDE_ALL_GCS
3693   assert(verify_serial_gc_flags(), "SerialGC unset");
3694 #endif // INCLUDE_ALL_GCS
3695 
3696   // Set bytecode rewriting flags
3697   set_bytecode_flags();
3698 
3699   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3700   set_aggressive_opts_flags();
3701 
3702   // Turn off biased locking for locking debug mode flags,
3703   // which are subtlely different from each other but neither works with
3704   // biased locking.
3705   if (UseHeavyMonitors
3706 #ifdef COMPILER1
3707       || !UseFastLocking
3708 #endif // COMPILER1
3709     ) {
3710     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3711       // flag set to true on command line; warn the user that they
3712       // can't enable biased locking here
3713       warning("Biased Locking is not supported with locking debug flags"
3714               "; ignoring UseBiasedLocking flag." );
3715     }
3716     UseBiasedLocking = false;
3717   }
3718 
3719 #ifdef CC_INTERP
3720   // Clear flags not supported by the C++ interpreter
3721   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3722   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3723   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3724   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3725 #endif // CC_INTERP
3726 
3727 #ifdef COMPILER2
3728   if (!UseBiasedLocking || EmitSync != 0) {
3729     UseOptoBiasInlining = false;
3730   }
3731   if (!EliminateLocks) {
3732     EliminateNestedLocks = false;
3733   }
3734   if (!Inline) {
3735     IncrementalInline = false;
3736   }
3737 #ifndef PRODUCT
3738   if (!IncrementalInline) {
3739     AlwaysIncrementalInline = false;
3740   }
3741 #endif
3742   if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3743     // incremental inlining: bump MaxNodeLimit
3744     FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3745   }
3746 #endif
3747 
3748   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3749     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3750     DebugNonSafepoints = true;
3751   }
3752 
3753   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3754     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3755   }
3756 
3757 #ifndef PRODUCT
3758   if (CompileTheWorld) {
3759     // Force NmethodSweeper to sweep whole CodeCache each time.
3760     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3761       NmethodSweepFraction = 1;
3762     }
3763   }
3764 
3765   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3766     if (use_vm_log()) {
3767       LogVMOutput = true;
3768     }
3769   }
3770 #endif // PRODUCT
3771 
3772   if (PrintCommandLineFlags) {
3773     CommandLineFlags::printSetFlags(tty);
3774   }
3775 
3776   // Apply CPU specific policy for the BiasedLocking
3777   if (UseBiasedLocking) {
3778     if (!VM_Version::use_biased_locking() &&
3779         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3780       UseBiasedLocking = false;
3781     }
3782   }
3783 
3784   // set PauseAtExit if the gamma launcher was used and a debugger is attached
3785   // but only if not already set on the commandline
3786   if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3787     bool set = false;
3788     CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3789     if (!set) {
3790       FLAG_SET_DEFAULT(PauseAtExit, true);
3791     }
3792   }
3793 
3794   return JNI_OK;
3795 }
3796 
3797 jint Arguments::adjust_after_os() {
3798 #if INCLUDE_ALL_GCS
3799   if (UseParallelGC || UseParallelOldGC) {
3800     if (UseNUMA) {
3801       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3802         FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3803       }
3804       // For those collectors or operating systems (eg, Windows) that do
3805       // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3806       UseNUMAInterleaving = true;
3807     }
3808   }
3809 #endif // INCLUDE_ALL_GCS
3810   return JNI_OK;
3811 }
3812 
3813 int Arguments::PropertyList_count(SystemProperty* pl) {
3814   int count = 0;
3815   while(pl != NULL) {
3816     count++;
3817     pl = pl->next();
3818   }
3819   return count;
3820 }
3821 
3822 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3823   assert(key != NULL, "just checking");
3824   SystemProperty* prop;
3825   for (prop = pl; prop != NULL; prop = prop->next()) {
3826     if (strcmp(key, prop->key()) == 0) return prop->value();
3827   }
3828   return NULL;
3829 }
3830 
3831 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3832   int count = 0;
3833   const char* ret_val = NULL;
3834 
3835   while(pl != NULL) {
3836     if(count >= index) {
3837       ret_val = pl->key();
3838       break;
3839     }
3840     count++;
3841     pl = pl->next();
3842   }
3843 
3844   return ret_val;
3845 }
3846 
3847 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3848   int count = 0;
3849   char* ret_val = NULL;
3850 
3851   while(pl != NULL) {
3852     if(count >= index) {
3853       ret_val = pl->value();
3854       break;
3855     }
3856     count++;
3857     pl = pl->next();
3858   }
3859 
3860   return ret_val;
3861 }
3862 
3863 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3864   SystemProperty* p = *plist;
3865   if (p == NULL) {
3866     *plist = new_p;
3867   } else {
3868     while (p->next() != NULL) {
3869       p = p->next();
3870     }
3871     p->set_next(new_p);
3872   }
3873 }
3874 
3875 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3876   if (plist == NULL)
3877     return;
3878 
3879   SystemProperty* new_p = new SystemProperty(k, v, true);
3880   PropertyList_add(plist, new_p);
3881 }
3882 
3883 // This add maintains unique property key in the list.
3884 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3885   if (plist == NULL)
3886     return;
3887 
3888   // If property key exist then update with new value.
3889   SystemProperty* prop;
3890   for (prop = *plist; prop != NULL; prop = prop->next()) {
3891     if (strcmp(k, prop->key()) == 0) {
3892       if (append) {
3893         prop->append_value(v);
3894       } else {
3895         prop->set_value(v);
3896       }
3897       return;
3898     }
3899   }
3900 
3901   PropertyList_add(plist, k, v);
3902 }
3903 
3904 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3905 // Returns true if all of the source pointed by src has been copied over to
3906 // the destination buffer pointed by buf. Otherwise, returns false.
3907 // Notes:
3908 // 1. If the length (buflen) of the destination buffer excluding the
3909 // NULL terminator character is not long enough for holding the expanded
3910 // pid characters, it also returns false instead of returning the partially
3911 // expanded one.
3912 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3913 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3914                                 char* buf, size_t buflen) {
3915   const char* p = src;
3916   char* b = buf;
3917   const char* src_end = &src[srclen];
3918   char* buf_end = &buf[buflen - 1];
3919 
3920   while (p < src_end && b < buf_end) {
3921     if (*p == '%') {
3922       switch (*(++p)) {
3923       case '%':         // "%%" ==> "%"
3924         *b++ = *p++;
3925         break;
3926       case 'p':  {       //  "%p" ==> current process id
3927         // buf_end points to the character before the last character so
3928         // that we could write '\0' to the end of the buffer.
3929         size_t buf_sz = buf_end - b + 1;
3930         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3931 
3932         // if jio_snprintf fails or the buffer is not long enough to hold
3933         // the expanded pid, returns false.
3934         if (ret < 0 || ret >= (int)buf_sz) {
3935           return false;
3936         } else {
3937           b += ret;
3938           assert(*b == '\0', "fail in copy_expand_pid");
3939           if (p == src_end && b == buf_end + 1) {
3940             // reach the end of the buffer.
3941             return true;
3942           }
3943         }
3944         p++;
3945         break;
3946       }
3947       default :
3948         *b++ = '%';
3949       }
3950     } else {
3951       *b++ = *p++;
3952     }
3953   }
3954   *b = '\0';
3955   return (p == src_end); // return false if not all of the source was copied
3956 }