1 /*
   2  * Copyright (c) 1997, 2014, 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_aix
  54 # include "os_aix.inline.hpp"
  55 #endif
  56 #ifdef TARGET_OS_FAMILY_bsd
  57 # include "os_bsd.inline.hpp"
  58 #endif
  59 #if INCLUDE_ALL_GCS
  60 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  61 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  62 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  63 #endif // INCLUDE_ALL_GCS
  64 
  65 // Note: This is a special bug reporting site for the JVM
  66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
  67 #define DEFAULT_JAVA_LAUNCHER  "generic"
  68 
  69 // Disable options not supported in this release, with a warning if they
  70 // were explicitly requested on the command-line
  71 #define UNSUPPORTED_OPTION(opt, description)                    \
  72 do {                                                            \
  73   if (opt) {                                                    \
  74     if (FLAG_IS_CMDLINE(opt)) {                                 \
  75       warning(description " is disabled in this release.");     \
  76     }                                                           \
  77     FLAG_SET_DEFAULT(opt, false);                               \
  78   }                                                             \
  79 } while(0)
  80 
  81 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  82 do {                                                                  \
  83   if (gc) {                                                           \
  84     if (FLAG_IS_CMDLINE(gc)) {                                        \
  85       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  86     }                                                                 \
  87     FLAG_SET_DEFAULT(gc, false);                                      \
  88   }                                                                   \
  89 } while(0)
  90 
  91 char**  Arguments::_jvm_flags_array             = NULL;
  92 int     Arguments::_num_jvm_flags               = 0;
  93 char**  Arguments::_jvm_args_array              = NULL;
  94 int     Arguments::_num_jvm_args                = 0;
  95 char*  Arguments::_java_command                 = NULL;
  96 SystemProperty* Arguments::_system_properties   = NULL;
  97 const char*  Arguments::_gc_log_filename        = NULL;
  98 bool   Arguments::_has_profile                  = false;
  99 size_t Arguments::_conservative_max_heap_alignment = 0;
 100 uintx  Arguments::_min_heap_size                = 0;
 101 Arguments::Mode Arguments::_mode                = _mixed;
 102 bool   Arguments::_java_compiler                = false;
 103 bool   Arguments::_xdebug_mode                  = false;
 104 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
 105 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
 106 int    Arguments::_sun_java_launcher_pid        = -1;
 107 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
 108 
 109 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
 110 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 111 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 112 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 113 bool   Arguments::_ClipInlining                 = ClipInlining;
 114 
 115 char*  Arguments::SharedArchivePath             = NULL;
 116 
 117 AgentLibraryList Arguments::_libraryList;
 118 AgentLibraryList Arguments::_agentList;
 119 
 120 abort_hook_t     Arguments::_abort_hook         = NULL;
 121 exit_hook_t      Arguments::_exit_hook          = NULL;
 122 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 123 
 124 
 125 SystemProperty *Arguments::_java_ext_dirs = NULL;
 126 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
 127 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 128 SystemProperty *Arguments::_java_library_path = NULL;
 129 SystemProperty *Arguments::_java_home = NULL;
 130 SystemProperty *Arguments::_java_class_path = NULL;
 131 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 132 
 133 char* Arguments::_meta_index_path = NULL;
 134 char* Arguments::_meta_index_dir = NULL;
 135 
 136 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
 137 
 138 static bool match_option(const JavaVMOption *option, const char* name,
 139                          const char** tail) {
 140   int len = (int)strlen(name);
 141   if (strncmp(option->optionString, name, len) == 0) {
 142     *tail = option->optionString + len;
 143     return true;
 144   } else {
 145     return false;
 146   }
 147 }
 148 
 149 static void logOption(const char* opt) {
 150   if (PrintVMOptions) {
 151     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 152   }
 153 }
 154 
 155 // Process java launcher properties.
 156 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 157   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 158   // sun.java.launcher.pid is defined.
 159   // Must do this before setting up other system properties,
 160   // as some of them may depend on launcher type.
 161   for (int index = 0; index < args->nOptions; index++) {
 162     const JavaVMOption* option = args->options + index;
 163     const char* tail;
 164 
 165     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 166       process_java_launcher_argument(tail, option->extraInfo);
 167       continue;
 168     }
 169     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 170       if (strcmp(tail, "true") == 0) {
 171         _sun_java_launcher_is_altjvm = true;
 172       }
 173       continue;
 174     }
 175     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 176       _sun_java_launcher_pid = atoi(tail);
 177       continue;
 178     }
 179   }
 180 }
 181 
 182 // Initialize system properties key and value.
 183 void Arguments::init_system_properties() {
 184 
 185   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 186                                                                  "Java Virtual Machine Specification",  false));
 187   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 188   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 189   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 190 
 191   // Following are JVMTI agent writable properties.
 192   // Properties values are set to NULL and they are
 193   // os specific they are initialized in os::init_system_properties_values().
 194   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 195   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 196   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 197   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 198   _java_home =  new SystemProperty("java.home", NULL,  true);
 199   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 200 
 201   _java_class_path = new SystemProperty("java.class.path", "",  true);
 202 
 203   // Add to System Property list.
 204   PropertyList_add(&_system_properties, _java_ext_dirs);
 205   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 206   PropertyList_add(&_system_properties, _sun_boot_library_path);
 207   PropertyList_add(&_system_properties, _java_library_path);
 208   PropertyList_add(&_system_properties, _java_home);
 209   PropertyList_add(&_system_properties, _java_class_path);
 210   PropertyList_add(&_system_properties, _sun_boot_class_path);
 211 
 212   // Set OS specific system properties values
 213   os::init_system_properties_values();
 214 }
 215 
 216 
 217   // Update/Initialize System properties after JDK version number is known
 218 void Arguments::init_version_specific_system_properties() {
 219   enum { bufsz = 16 };
 220   char buffer[bufsz];
 221   const char* spec_vendor = "Sun Microsystems Inc.";
 222   uint32_t spec_version = 0;
 223 
 224   if (JDK_Version::is_gte_jdk17x_version()) {
 225     spec_vendor = "Oracle Corporation";
 226     spec_version = JDK_Version::current().major_version();
 227   }
 228   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 229 
 230   PropertyList_add(&_system_properties,
 231       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 232   PropertyList_add(&_system_properties,
 233       new SystemProperty("java.vm.specification.version", buffer, false));
 234   PropertyList_add(&_system_properties,
 235       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 236 }
 237 
 238 /**
 239  * Provide a slightly more user-friendly way of eliminating -XX flags.
 240  * When a flag is eliminated, it can be added to this list in order to
 241  * continue accepting this flag on the command-line, while issuing a warning
 242  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 243  * limit, we flatly refuse to admit the existence of the flag.  This allows
 244  * a flag to die correctly over JDK releases using HSX.
 245  */
 246 typedef struct {
 247   const char* name;
 248   JDK_Version obsoleted_in; // when the flag went away
 249   JDK_Version accept_until; // which version to start denying the existence
 250 } ObsoleteFlag;
 251 
 252 static ObsoleteFlag obsolete_jvm_flags[] = {
 253   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 254   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 255   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 256   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 257   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 258   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 259   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 260   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 261   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 262   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 263   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 264   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 265   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 266   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 267   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 268   { "DefaultInitialRAMFraction",
 269                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 270   { "UseDepthFirstScavengeOrder",
 271                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 272   { "HandlePromotionFailure",
 273                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 274   { "MaxLiveObjectEvacuationRatio",
 275                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 276   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 277   { "UseParallelOldGCCompacting",
 278                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 279   { "UseParallelDensePrefixUpdate",
 280                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 281   { "UseParallelOldGCDensePrefix",
 282                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 283   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 284   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 285   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 286   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 287   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 288   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 289   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 290   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 291   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 292   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 293   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 294   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 295   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 296   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 297   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 298   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 299   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 300   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 301   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 302   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 303   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 304 #ifdef PRODUCT
 305   { "DesiredMethodLimit",
 306                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 307 #endif // PRODUCT
 308   { NULL, JDK_Version(0), JDK_Version(0) }
 309 };
 310 
 311 // Returns true if the flag is obsolete and fits into the range specified
 312 // for being ignored.  In the case that the flag is ignored, the 'version'
 313 // value is filled in with the version number when the flag became
 314 // obsolete so that that value can be displayed to the user.
 315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 316   int i = 0;
 317   assert(version != NULL, "Must provide a version buffer");
 318   while (obsolete_jvm_flags[i].name != NULL) {
 319     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 320     // <flag>=xxx form
 321     // [-|+]<flag> form
 322     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 323         ((s[0] == '+' || s[0] == '-') &&
 324         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 325       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 326           *version = flag_status.obsoleted_in;
 327           return true;
 328       }
 329     }
 330     i++;
 331   }
 332   return false;
 333 }
 334 
 335 // Constructs the system class path (aka boot class path) from the following
 336 // components, in order:
 337 //
 338 //     prefix           // from -Xbootclasspath/p:...
 339 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 340 //     base             // from os::get_system_properties() or -Xbootclasspath=
 341 //     suffix           // from -Xbootclasspath/a:...
 342 //
 343 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 344 // directories are added to the sysclasspath just before the base.
 345 //
 346 // This could be AllStatic, but it isn't needed after argument processing is
 347 // complete.
 348 class SysClassPath: public StackObj {
 349 public:
 350   SysClassPath(const char* base);
 351   ~SysClassPath();
 352 
 353   inline void set_base(const char* base);
 354   inline void add_prefix(const char* prefix);
 355   inline void add_suffix_to_prefix(const char* suffix);
 356   inline void add_suffix(const char* suffix);
 357   inline void reset_path(const char* base);
 358 
 359   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 360   // property.  Must be called after all command-line arguments have been
 361   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 362   // combined_path().
 363   void expand_endorsed();
 364 
 365   inline const char* get_base()     const { return _items[_scp_base]; }
 366   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 367   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 368   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 369 
 370   // Combine all the components into a single c-heap-allocated string; caller
 371   // must free the string if/when no longer needed.
 372   char* combined_path();
 373 
 374 private:
 375   // Utility routines.
 376   static char* add_to_path(const char* path, const char* str, bool prepend);
 377   static char* add_jars_to_path(char* path, const char* directory);
 378 
 379   inline void reset_item_at(int index);
 380 
 381   // Array indices for the items that make up the sysclasspath.  All except the
 382   // base are allocated in the C heap and freed by this class.
 383   enum {
 384     _scp_prefix,        // from -Xbootclasspath/p:...
 385     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 386     _scp_base,          // the default sysclasspath
 387     _scp_suffix,        // from -Xbootclasspath/a:...
 388     _scp_nitems         // the number of items, must be last.
 389   };
 390 
 391   const char* _items[_scp_nitems];
 392   DEBUG_ONLY(bool _expansion_done;)
 393 };
 394 
 395 SysClassPath::SysClassPath(const char* base) {
 396   memset(_items, 0, sizeof(_items));
 397   _items[_scp_base] = base;
 398   DEBUG_ONLY(_expansion_done = false;)
 399 }
 400 
 401 SysClassPath::~SysClassPath() {
 402   // Free everything except the base.
 403   for (int i = 0; i < _scp_nitems; ++i) {
 404     if (i != _scp_base) reset_item_at(i);
 405   }
 406   DEBUG_ONLY(_expansion_done = false;)
 407 }
 408 
 409 inline void SysClassPath::set_base(const char* base) {
 410   _items[_scp_base] = base;
 411 }
 412 
 413 inline void SysClassPath::add_prefix(const char* prefix) {
 414   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 415 }
 416 
 417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 418   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 419 }
 420 
 421 inline void SysClassPath::add_suffix(const char* suffix) {
 422   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 423 }
 424 
 425 inline void SysClassPath::reset_item_at(int index) {
 426   assert(index < _scp_nitems && index != _scp_base, "just checking");
 427   if (_items[index] != NULL) {
 428     FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
 429     _items[index] = NULL;
 430   }
 431 }
 432 
 433 inline void SysClassPath::reset_path(const char* base) {
 434   // Clear the prefix and suffix.
 435   reset_item_at(_scp_prefix);
 436   reset_item_at(_scp_suffix);
 437   set_base(base);
 438 }
 439 
 440 //------------------------------------------------------------------------------
 441 
 442 void SysClassPath::expand_endorsed() {
 443   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 444 
 445   const char* path = Arguments::get_property("java.endorsed.dirs");
 446   if (path == NULL) {
 447     path = Arguments::get_endorsed_dir();
 448     assert(path != NULL, "no default for java.endorsed.dirs");
 449   }
 450 
 451   char* expanded_path = NULL;
 452   const char separator = *os::path_separator();
 453   const char* const end = path + strlen(path);
 454   while (path < end) {
 455     const char* tmp_end = strchr(path, separator);
 456     if (tmp_end == NULL) {
 457       expanded_path = add_jars_to_path(expanded_path, path);
 458       path = end;
 459     } else {
 460       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
 461       memcpy(dirpath, path, tmp_end - path);
 462       dirpath[tmp_end - path] = '\0';
 463       expanded_path = add_jars_to_path(expanded_path, dirpath);
 464       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
 465       path = tmp_end + 1;
 466     }
 467   }
 468   _items[_scp_endorsed] = expanded_path;
 469   DEBUG_ONLY(_expansion_done = true;)
 470 }
 471 
 472 // Combine the bootclasspath elements, some of which may be null, into a single
 473 // c-heap-allocated string.
 474 char* SysClassPath::combined_path() {
 475   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 476   assert(_expansion_done, "must call expand_endorsed() first.");
 477 
 478   size_t lengths[_scp_nitems];
 479   size_t total_len = 0;
 480 
 481   const char separator = *os::path_separator();
 482 
 483   // Get the lengths.
 484   int i;
 485   for (i = 0; i < _scp_nitems; ++i) {
 486     if (_items[i] != NULL) {
 487       lengths[i] = strlen(_items[i]);
 488       // Include space for the separator char (or a NULL for the last item).
 489       total_len += lengths[i] + 1;
 490     }
 491   }
 492   assert(total_len > 0, "empty sysclasspath not allowed");
 493 
 494   // Copy the _items to a single string.
 495   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 496   char* cp_tmp = cp;
 497   for (i = 0; i < _scp_nitems; ++i) {
 498     if (_items[i] != NULL) {
 499       memcpy(cp_tmp, _items[i], lengths[i]);
 500       cp_tmp += lengths[i];
 501       *cp_tmp++ = separator;
 502     }
 503   }
 504   *--cp_tmp = '\0';     // Replace the extra separator.
 505   return cp;
 506 }
 507 
 508 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 509 char*
 510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 511   char *cp;
 512 
 513   assert(str != NULL, "just checking");
 514   if (path == NULL) {
 515     size_t len = strlen(str) + 1;
 516     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 517     memcpy(cp, str, len);                       // copy the trailing null
 518   } else {
 519     const char separator = *os::path_separator();
 520     size_t old_len = strlen(path);
 521     size_t str_len = strlen(str);
 522     size_t len = old_len + str_len + 2;
 523 
 524     if (prepend) {
 525       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 526       char* cp_tmp = cp;
 527       memcpy(cp_tmp, str, str_len);
 528       cp_tmp += str_len;
 529       *cp_tmp = separator;
 530       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 531       FREE_C_HEAP_ARRAY(char, path, mtInternal);
 532     } else {
 533       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 534       char* cp_tmp = cp + old_len;
 535       *cp_tmp = separator;
 536       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 537     }
 538   }
 539   return cp;
 540 }
 541 
 542 // Scan the directory and append any jar or zip files found to path.
 543 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 545   DIR* dir = os::opendir(directory);
 546   if (dir == NULL) return path;
 547 
 548   char dir_sep[2] = { '\0', '\0' };
 549   size_t directory_len = strlen(directory);
 550   const char fileSep = *os::file_separator();
 551   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 552 
 553   /* Scan the directory for jars/zips, appending them to path. */
 554   struct dirent *entry;
 555   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 556   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 557     const char* name = entry->d_name;
 558     const char* ext = name + strlen(name) - 4;
 559     bool isJarOrZip = ext > name &&
 560       (os::file_name_strcmp(ext, ".jar") == 0 ||
 561        os::file_name_strcmp(ext, ".zip") == 0);
 562     if (isJarOrZip) {
 563       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 564       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 565       path = add_to_path(path, jarpath, false);
 566       FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
 567     }
 568   }
 569   FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
 570   os::closedir(dir);
 571   return path;
 572 }
 573 
 574 // Parses a memory size specification string.
 575 static bool atomull(const char *s, julong* result) {
 576   julong n = 0;
 577   int args_read = sscanf(s, JULONG_FORMAT, &n);
 578   if (args_read != 1) {
 579     return false;
 580   }
 581   while (*s != '\0' && isdigit(*s)) {
 582     s++;
 583   }
 584   // 4705540: illegal if more characters are found after the first non-digit
 585   if (strlen(s) > 1) {
 586     return false;
 587   }
 588   switch (*s) {
 589     case 'T': case 't':
 590       *result = n * G * K;
 591       // Check for overflow.
 592       if (*result/((julong)G * K) != n) return false;
 593       return true;
 594     case 'G': case 'g':
 595       *result = n * G;
 596       if (*result/G != n) return false;
 597       return true;
 598     case 'M': case 'm':
 599       *result = n * M;
 600       if (*result/M != n) return false;
 601       return true;
 602     case 'K': case 'k':
 603       *result = n * K;
 604       if (*result/K != n) return false;
 605       return true;
 606     case '\0':
 607       *result = n;
 608       return true;
 609     default:
 610       return false;
 611   }
 612 }
 613 
 614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 615   if (size < min_size) return arg_too_small;
 616   // Check that size will fit in a size_t (only relevant on 32-bit)
 617   if (size > max_uintx) return arg_too_big;
 618   return arg_in_range;
 619 }
 620 
 621 // Describe an argument out of range error
 622 void Arguments::describe_range_error(ArgsRange errcode) {
 623   switch(errcode) {
 624   case arg_too_big:
 625     jio_fprintf(defaultStream::error_stream(),
 626                 "The specified size exceeds the maximum "
 627                 "representable size.\n");
 628     break;
 629   case arg_too_small:
 630   case arg_unreadable:
 631   case arg_in_range:
 632     // do nothing for now
 633     break;
 634   default:
 635     ShouldNotReachHere();
 636   }
 637 }
 638 
 639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 640   return CommandLineFlags::boolAtPut(name, &value, origin);
 641 }
 642 
 643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 644   double v;
 645   if (sscanf(value, "%lf", &v) != 1) {
 646     return false;
 647   }
 648 
 649   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 650     return true;
 651   }
 652   return false;
 653 }
 654 
 655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 656   julong v;
 657   intx intx_v;
 658   bool is_neg = false;
 659   // Check the sign first since atomull() parses only unsigned values.
 660   if (*value == '-') {
 661     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 662       return false;
 663     }
 664     value++;
 665     is_neg = true;
 666   }
 667   if (!atomull(value, &v)) {
 668     return false;
 669   }
 670   intx_v = (intx) v;
 671   if (is_neg) {
 672     intx_v = -intx_v;
 673   }
 674   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 675     return true;
 676   }
 677   uintx uintx_v = (uintx) v;
 678   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 679     return true;
 680   }
 681   uint64_t uint64_t_v = (uint64_t) v;
 682   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 683     return true;
 684   }
 685   return false;
 686 }
 687 
 688 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 689   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 690   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 691   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 692   return true;
 693 }
 694 
 695 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 696   const char* old_value = "";
 697   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 698   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 699   size_t new_len = strlen(new_value);
 700   const char* value;
 701   char* free_this_too = NULL;
 702   if (old_len == 0) {
 703     value = new_value;
 704   } else if (new_len == 0) {
 705     value = old_value;
 706   } else {
 707     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 708     // each new setting adds another LINE to the switch:
 709     sprintf(buf, "%s\n%s", old_value, new_value);
 710     value = buf;
 711     free_this_too = buf;
 712   }
 713   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 714   // CommandLineFlags always returns a pointer that needs freeing.
 715   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 716   if (free_this_too != NULL) {
 717     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 718     FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
 719   }
 720   return true;
 721 }
 722 
 723 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 724 
 725   // range of acceptable characters spelled out for portability reasons
 726 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 727 #define BUFLEN 255
 728   char name[BUFLEN+1];
 729   char dummy;
 730 
 731   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 732     return set_bool_flag(name, false, origin);
 733   }
 734   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 735     return set_bool_flag(name, true, origin);
 736   }
 737 
 738   char punct;
 739   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 740     const char* value = strchr(arg, '=') + 1;
 741     Flag* flag = Flag::find_flag(name, strlen(name));
 742     if (flag != NULL && flag->is_ccstr()) {
 743       if (flag->ccstr_accumulates()) {
 744         return append_to_string_flag(name, value, origin);
 745       } else {
 746         if (value[0] == '\0') {
 747           value = NULL;
 748         }
 749         return set_string_flag(name, value, origin);
 750       }
 751     }
 752   }
 753 
 754   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 755     const char* value = strchr(arg, '=') + 1;
 756     // -XX:Foo:=xxx will reset the string flag to the given value.
 757     if (value[0] == '\0') {
 758       value = NULL;
 759     }
 760     return set_string_flag(name, value, origin);
 761   }
 762 
 763 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 764 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 765 #define        NUMBER_RANGE    "[0123456789]"
 766   char value[BUFLEN + 1];
 767   char value2[BUFLEN + 1];
 768   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 769     // Looks like a floating-point number -- try again with more lenient format string
 770     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 771       return set_fp_numeric_flag(name, value, origin);
 772     }
 773   }
 774 
 775 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 776   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 777     return set_numeric_flag(name, value, origin);
 778   }
 779 
 780   return false;
 781 }
 782 
 783 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 784   assert(bldarray != NULL, "illegal argument");
 785 
 786   if (arg == NULL) {
 787     return;
 788   }
 789 
 790   int new_count = *count + 1;
 791 
 792   // expand the array and add arg to the last element
 793   if (*bldarray == NULL) {
 794     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 795   } else {
 796     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 797   }
 798   (*bldarray)[*count] = strdup(arg);
 799   *count = new_count;
 800 }
 801 
 802 void Arguments::build_jvm_args(const char* arg) {
 803   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 804 }
 805 
 806 void Arguments::build_jvm_flags(const char* arg) {
 807   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 808 }
 809 
 810 // utility function to return a string that concatenates all
 811 // strings in a given char** array
 812 const char* Arguments::build_resource_string(char** args, int count) {
 813   if (args == NULL || count == 0) {
 814     return NULL;
 815   }
 816   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 817   for (int i = 1; i < count; i++) {
 818     length += strlen(args[i]) + 1; // add 1 for a space
 819   }
 820   char* s = NEW_RESOURCE_ARRAY(char, length);
 821   strcpy(s, args[0]);
 822   for (int j = 1; j < count; j++) {
 823     strcat(s, " ");
 824     strcat(s, args[j]);
 825   }
 826   return (const char*) s;
 827 }
 828 
 829 void Arguments::print_on(outputStream* st) {
 830   st->print_cr("VM Arguments:");
 831   if (num_jvm_flags() > 0) {
 832     st->print("jvm_flags: "); print_jvm_flags_on(st);
 833   }
 834   if (num_jvm_args() > 0) {
 835     st->print("jvm_args: "); print_jvm_args_on(st);
 836   }
 837   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 838   if (_java_class_path != NULL) {
 839     char* path = _java_class_path->value();
 840     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 841   }
 842   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 843 }
 844 
 845 void Arguments::print_jvm_flags_on(outputStream* st) {
 846   if (_num_jvm_flags > 0) {
 847     for (int i=0; i < _num_jvm_flags; i++) {
 848       st->print("%s ", _jvm_flags_array[i]);
 849     }
 850     st->print_cr("");
 851   }
 852 }
 853 
 854 void Arguments::print_jvm_args_on(outputStream* st) {
 855   if (_num_jvm_args > 0) {
 856     for (int i=0; i < _num_jvm_args; i++) {
 857       st->print("%s ", _jvm_args_array[i]);
 858     }
 859     st->print_cr("");
 860   }
 861 }
 862 
 863 bool Arguments::process_argument(const char* arg,
 864     jboolean ignore_unrecognized, Flag::Flags origin) {
 865 
 866   JDK_Version since = JDK_Version();
 867 
 868   if (parse_argument(arg, origin) || ignore_unrecognized) {
 869     return true;
 870   }
 871 
 872   bool has_plus_minus = (*arg == '+' || *arg == '-');
 873   const char* const argname = has_plus_minus ? arg + 1 : arg;
 874   if (is_newly_obsolete(arg, &since)) {
 875     char version[256];
 876     since.to_string(version, sizeof(version));
 877     warning("ignoring option %s; support was removed in %s", argname, version);
 878     return true;
 879   }
 880 
 881   // For locked flags, report a custom error message if available.
 882   // Otherwise, report the standard unrecognized VM option.
 883 
 884   size_t arg_len;
 885   const char* equal_sign = strchr(argname, '=');
 886   if (equal_sign == NULL) {
 887     arg_len = strlen(argname);
 888   } else {
 889     arg_len = equal_sign - argname;
 890   }
 891 
 892   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 893   if (found_flag != NULL) {
 894     char locked_message_buf[BUFLEN];
 895     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 896     if (strlen(locked_message_buf) == 0) {
 897       if (found_flag->is_bool() && !has_plus_minus) {
 898         jio_fprintf(defaultStream::error_stream(),
 899           "Missing +/- setting for VM option '%s'\n", argname);
 900       } else if (!found_flag->is_bool() && has_plus_minus) {
 901         jio_fprintf(defaultStream::error_stream(),
 902           "Unexpected +/- setting in VM option '%s'\n", argname);
 903       } else {
 904         jio_fprintf(defaultStream::error_stream(),
 905           "Improperly specified VM option '%s'\n", argname);
 906       }
 907     } else {
 908       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 909     }
 910   } else {
 911     jio_fprintf(defaultStream::error_stream(),
 912                 "Unrecognized VM option '%s'\n", argname);
 913     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 914     if (fuzzy_matched != NULL) {
 915       jio_fprintf(defaultStream::error_stream(),
 916                   "Did you mean '%s%s%s'?\n",
 917                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 918                   fuzzy_matched->_name,
 919                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 920     }
 921   }
 922 
 923   // allow for commandline "commenting out" options like -XX:#+Verbose
 924   return arg[0] == '#';
 925 }
 926 
 927 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 928   FILE* stream = fopen(file_name, "rb");
 929   if (stream == NULL) {
 930     if (should_exist) {
 931       jio_fprintf(defaultStream::error_stream(),
 932                   "Could not open settings file %s\n", file_name);
 933       return false;
 934     } else {
 935       return true;
 936     }
 937   }
 938 
 939   char token[1024];
 940   int  pos = 0;
 941 
 942   bool in_white_space = true;
 943   bool in_comment     = false;
 944   bool in_quote       = false;
 945   char quote_c        = 0;
 946   bool result         = true;
 947 
 948   int c = getc(stream);
 949   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 950     if (in_white_space) {
 951       if (in_comment) {
 952         if (c == '\n') in_comment = false;
 953       } else {
 954         if (c == '#') in_comment = true;
 955         else if (!isspace(c)) {
 956           in_white_space = false;
 957           token[pos++] = c;
 958         }
 959       }
 960     } else {
 961       if (c == '\n' || (!in_quote && isspace(c))) {
 962         // token ends at newline, or at unquoted whitespace
 963         // this allows a way to include spaces in string-valued options
 964         token[pos] = '\0';
 965         logOption(token);
 966         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 967         build_jvm_flags(token);
 968         pos = 0;
 969         in_white_space = true;
 970         in_quote = false;
 971       } else if (!in_quote && (c == '\'' || c == '"')) {
 972         in_quote = true;
 973         quote_c = c;
 974       } else if (in_quote && (c == quote_c)) {
 975         in_quote = false;
 976       } else {
 977         token[pos++] = c;
 978       }
 979     }
 980     c = getc(stream);
 981   }
 982   if (pos > 0) {
 983     token[pos] = '\0';
 984     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 985     build_jvm_flags(token);
 986   }
 987   fclose(stream);
 988   return result;
 989 }
 990 
 991 //=============================================================================================================
 992 // Parsing of properties (-D)
 993 
 994 const char* Arguments::get_property(const char* key) {
 995   return PropertyList_get_value(system_properties(), key);
 996 }
 997 
 998 bool Arguments::add_property(const char* prop) {
 999   const char* eq = strchr(prop, '=');
1000   char* key;
1001   // ns must be static--its address may be stored in a SystemProperty object.
1002   const static char ns[1] = {0};
1003   char* value = (char *)ns;
1004 
1005   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1006   key = AllocateHeap(key_len + 1, mtInternal);
1007   strncpy(key, prop, key_len);
1008   key[key_len] = '\0';
1009 
1010   if (eq != NULL) {
1011     size_t value_len = strlen(prop) - key_len - 1;
1012     value = AllocateHeap(value_len + 1, mtInternal);
1013     strncpy(value, &prop[key_len + 1], value_len + 1);
1014   }
1015 
1016   if (strcmp(key, "java.compiler") == 0) {
1017     process_java_compiler_argument(value);
1018     FreeHeap(key);
1019     if (eq != NULL) {
1020       FreeHeap(value);
1021     }
1022     return true;
1023   } else if (strcmp(key, "sun.java.command") == 0) {
1024     _java_command = value;
1025 
1026     // Record value in Arguments, but let it get passed to Java.
1027   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1028              strcmp(key, "sun.java.launcher.pid") == 0) {
1029     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1030     // private and are processed in process_sun_java_launcher_properties();
1031     // the sun.java.launcher property is passed on to the java application
1032     FreeHeap(key);
1033     if (eq != NULL) {
1034       FreeHeap(value);
1035     }
1036     return true;
1037   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1038     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1039     // its value without going through the property list or making a Java call.
1040     _java_vendor_url_bug = value;
1041   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1042     PropertyList_unique_add(&_system_properties, key, value, true);
1043     return true;
1044   }
1045   // Create new property and add at the end of the list
1046   PropertyList_unique_add(&_system_properties, key, value);
1047   return true;
1048 }
1049 
1050 //===========================================================================================================
1051 // Setting int/mixed/comp mode flags
1052 
1053 void Arguments::set_mode_flags(Mode mode) {
1054   // Set up default values for all flags.
1055   // If you add a flag to any of the branches below,
1056   // add a default value for it here.
1057   set_java_compiler(false);
1058   _mode                      = mode;
1059 
1060   // Ensure Agent_OnLoad has the correct initial values.
1061   // This may not be the final mode; mode may change later in onload phase.
1062   PropertyList_unique_add(&_system_properties, "java.vm.info",
1063                           (char*)VM_Version::vm_info_string(), false);
1064 
1065   UseInterpreter             = true;
1066   UseCompiler                = true;
1067   UseLoopCounter             = true;
1068 
1069 #ifndef ZERO
1070   // Turn these off for mixed and comp.  Leave them on for Zero.
1071   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1072     UseFastAccessorMethods = (mode == _int);
1073   }
1074   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1075     UseFastEmptyMethods = (mode == _int);
1076   }
1077 #endif
1078 
1079   // Default values may be platform/compiler dependent -
1080   // use the saved values
1081   ClipInlining               = Arguments::_ClipInlining;
1082   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1083   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1084   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1085 
1086   // Change from defaults based on mode
1087   switch (mode) {
1088   default:
1089     ShouldNotReachHere();
1090     break;
1091   case _int:
1092     UseCompiler              = false;
1093     UseLoopCounter           = false;
1094     AlwaysCompileLoopMethods = false;
1095     UseOnStackReplacement    = false;
1096     break;
1097   case _mixed:
1098     // same as default
1099     break;
1100   case _comp:
1101     UseInterpreter           = false;
1102     BackgroundCompilation    = false;
1103     ClipInlining             = false;
1104     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1105     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1106     // compile a level 4 (C2) and then continue executing it.
1107     if (TieredCompilation) {
1108       Tier3InvokeNotifyFreqLog = 0;
1109       Tier4InvocationThreshold = 0;
1110     }
1111     break;
1112   }
1113 }
1114 
1115 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1116 // Conflict: required to use shared spaces (-Xshare:on), but
1117 // incompatible command line options were chosen.
1118 
1119 static void no_shared_spaces() {
1120   if (RequireSharedSpaces) {
1121     jio_fprintf(defaultStream::error_stream(),
1122       "Class data sharing is inconsistent with other specified options.\n");
1123     vm_exit_during_initialization("Unable to use shared archive.", NULL);
1124   } else {
1125     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1126   }
1127 }
1128 #endif
1129 
1130 void Arguments::set_tiered_flags() {
1131   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1132   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1133     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1134   }
1135   if (CompilationPolicyChoice < 2) {
1136     vm_exit_during_initialization(
1137       "Incompatible compilation policy selected", NULL);
1138   }
1139   // Increase the code cache size - tiered compiles a lot more.
1140   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1141     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1142   }
1143   if (!UseInterpreter) { // -Xcomp
1144     Tier3InvokeNotifyFreqLog = 0;
1145     Tier4InvocationThreshold = 0;
1146   }
1147 }
1148 
1149 #if INCLUDE_ALL_GCS
1150 static void disable_adaptive_size_policy(const char* collector_name) {
1151   if (UseAdaptiveSizePolicy) {
1152     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1153       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1154               collector_name);
1155     }
1156     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1157   }
1158 }
1159 
1160 void Arguments::set_parnew_gc_flags() {
1161   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1162          "control point invariant");
1163   assert(UseParNewGC, "Error");
1164 
1165   // Turn off AdaptiveSizePolicy for parnew until it is complete.
1166   disable_adaptive_size_policy("UseParNewGC");
1167 
1168   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1169     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1170     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1171   } else if (ParallelGCThreads == 0) {
1172     jio_fprintf(defaultStream::error_stream(),
1173         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1174     vm_exit(1);
1175   }
1176 
1177   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1178   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1179   // we set them to 1024 and 1024.
1180   // See CR 6362902.
1181   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1182     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1183   }
1184   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1185     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1186   }
1187 
1188   // AlwaysTenure flag should make ParNew promote all at first collection.
1189   // See CR 6362902.
1190   if (AlwaysTenure) {
1191     FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1192   }
1193   // When using compressed oops, we use local overflow stacks,
1194   // rather than using a global overflow list chained through
1195   // the klass word of the object's pre-image.
1196   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1197     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1198       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1199     }
1200     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1201   }
1202   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1203 }
1204 
1205 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1206 // sparc/solaris for certain applications, but would gain from
1207 // further optimization and tuning efforts, and would almost
1208 // certainly gain from analysis of platform and environment.
1209 void Arguments::set_cms_and_parnew_gc_flags() {
1210   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1211   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1212 
1213   // If we are using CMS, we prefer to UseParNewGC,
1214   // unless explicitly forbidden.
1215   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1216     FLAG_SET_ERGO(bool, UseParNewGC, true);
1217   }
1218 
1219   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1220   disable_adaptive_size_policy("UseConcMarkSweepGC");
1221 
1222   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1223   // as needed.
1224   if (UseParNewGC) {
1225     set_parnew_gc_flags();
1226   }
1227 
1228   size_t max_heap = align_size_down(MaxHeapSize,
1229                                     CardTableRS::ct_max_alignment_constraint());
1230 
1231   // Now make adjustments for CMS
1232   intx   tenuring_default = (intx)6;
1233   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1234 
1235   // Preferred young gen size for "short" pauses:
1236   // upper bound depends on # of threads and NewRatio.
1237   const uintx parallel_gc_threads =
1238     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1239   const size_t preferred_max_new_size_unaligned =
1240     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1241   size_t preferred_max_new_size =
1242     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1243 
1244   // Unless explicitly requested otherwise, size young gen
1245   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1246 
1247   // If either MaxNewSize or NewRatio is set on the command line,
1248   // assume the user is trying to set the size of the young gen.
1249   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1250 
1251     // Set MaxNewSize to our calculated preferred_max_new_size unless
1252     // NewSize was set on the command line and it is larger than
1253     // preferred_max_new_size.
1254     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1255       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1256     } else {
1257       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1258     }
1259     if (PrintGCDetails && Verbose) {
1260       // Too early to use gclog_or_tty
1261       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1262     }
1263 
1264     // Code along this path potentially sets NewSize and OldSize
1265     if (PrintGCDetails && Verbose) {
1266       // Too early to use gclog_or_tty
1267       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1268            " initial_heap_size:  " SIZE_FORMAT
1269            " max_heap: " SIZE_FORMAT,
1270            min_heap_size(), InitialHeapSize, max_heap);
1271     }
1272     size_t min_new = preferred_max_new_size;
1273     if (FLAG_IS_CMDLINE(NewSize)) {
1274       min_new = NewSize;
1275     }
1276     if (max_heap > min_new && min_heap_size() > min_new) {
1277       // Unless explicitly requested otherwise, make young gen
1278       // at least min_new, and at most preferred_max_new_size.
1279       if (FLAG_IS_DEFAULT(NewSize)) {
1280         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1281         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1282         if (PrintGCDetails && Verbose) {
1283           // Too early to use gclog_or_tty
1284           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1285         }
1286       }
1287       // Unless explicitly requested otherwise, size old gen
1288       // so it's NewRatio x of NewSize.
1289       if (FLAG_IS_DEFAULT(OldSize)) {
1290         if (max_heap > NewSize) {
1291           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1292           if (PrintGCDetails && Verbose) {
1293             // Too early to use gclog_or_tty
1294             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1295           }
1296         }
1297       }
1298     }
1299   }
1300   // Unless explicitly requested otherwise, definitely
1301   // promote all objects surviving "tenuring_default" scavenges.
1302   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1303       FLAG_IS_DEFAULT(SurvivorRatio)) {
1304     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1305   }
1306   // If we decided above (or user explicitly requested)
1307   // `promote all' (via MaxTenuringThreshold := 0),
1308   // prefer minuscule survivor spaces so as not to waste
1309   // space for (non-existent) survivors
1310   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1311     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1312   }
1313   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1314   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1315   // This is done in order to make ParNew+CMS configuration to work
1316   // with YoungPLABSize and OldPLABSize options.
1317   // See CR 6362902.
1318   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1319     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1320       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1321       // is.  In this situation let CMSParPromoteBlocksToClaim follow
1322       // the value (either from the command line or ergonomics) of
1323       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1324       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1325     } else {
1326       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1327       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1328       // we'll let it to take precedence.
1329       jio_fprintf(defaultStream::error_stream(),
1330                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1331                   " options are specified for the CMS collector."
1332                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1333     }
1334   }
1335   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1336     // OldPLAB sizing manually turned off: Use a larger default setting,
1337     // unless it was manually specified. This is because a too-low value
1338     // will slow down scavenges.
1339     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1340       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1341     }
1342   }
1343   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1344   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1345   // If either of the static initialization defaults have changed, note this
1346   // modification.
1347   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1348     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1349   }
1350   if (PrintGCDetails && Verbose) {
1351     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1352       MarkStackSize / K, MarkStackSizeMax / K);
1353     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1354   }
1355 }
1356 #endif // INCLUDE_ALL_GCS
1357 
1358 void set_object_alignment() {
1359   // Object alignment.
1360   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1361   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1362   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1363   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1364   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1365   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1366 
1367   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1368   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1369 
1370   // Oop encoding heap max
1371   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1372 
1373 #if INCLUDE_ALL_GCS
1374   // Set CMS global values
1375   CompactibleFreeListSpace::set_cms_values();
1376 #endif // INCLUDE_ALL_GCS
1377 }
1378 
1379 bool verify_object_alignment() {
1380   // Object alignment.
1381   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1382     jio_fprintf(defaultStream::error_stream(),
1383                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1384                 (int)ObjectAlignmentInBytes);
1385     return false;
1386   }
1387   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1388     jio_fprintf(defaultStream::error_stream(),
1389                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1390                 (int)ObjectAlignmentInBytes, BytesPerLong);
1391     return false;
1392   }
1393   // It does not make sense to have big object alignment
1394   // since a space lost due to alignment will be greater
1395   // then a saved space from compressed oops.
1396   if ((int)ObjectAlignmentInBytes > 256) {
1397     jio_fprintf(defaultStream::error_stream(),
1398                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1399                 (int)ObjectAlignmentInBytes);
1400     return false;
1401   }
1402   // In case page size is very small.
1403   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1404     jio_fprintf(defaultStream::error_stream(),
1405                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1406                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1407     return false;
1408   }
1409   return true;
1410 }
1411 
1412 uintx Arguments::max_heap_for_compressed_oops() {
1413   // Avoid sign flip.
1414   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1415   // We need to fit both the NULL page and the heap into the memory budget, while
1416   // keeping alignment constraints of the heap. To guarantee the latter, as the
1417   // NULL page is located before the heap, we pad the NULL page to the conservative
1418   // maximum alignment that the GC may ever impose upon the heap.
1419   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1420                                                         _conservative_max_heap_alignment);
1421 
1422   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1423   NOT_LP64(ShouldNotReachHere(); return 0);
1424 }
1425 
1426 bool Arguments::should_auto_select_low_pause_collector() {
1427   if (UseAutoGCSelectPolicy &&
1428       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1429       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1430     if (PrintGCDetails) {
1431       // Cannot use gclog_or_tty yet.
1432       tty->print_cr("Automatic selection of the low pause collector"
1433        " based on pause goal of %d (ms)", MaxGCPauseMillis);
1434     }
1435     return true;
1436   }
1437   return false;
1438 }
1439 
1440 void Arguments::set_use_compressed_oops() {
1441 #ifndef ZERO
1442 #ifdef _LP64
1443   // MaxHeapSize is not set up properly at this point, but
1444   // the only value that can override MaxHeapSize if we are
1445   // to use UseCompressedOops is InitialHeapSize.
1446   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1447 
1448   if (max_heap_size <= max_heap_for_compressed_oops()) {
1449 #if !defined(COMPILER1) || defined(TIERED)
1450     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1451       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1452     }
1453 #endif
1454 #ifdef _WIN64
1455     if (UseLargePages && UseCompressedOops) {
1456       // Cannot allocate guard pages for implicit checks in indexed addressing
1457       // mode, when large pages are specified on windows.
1458       // This flag could be switched ON if narrow oop base address is set to 0,
1459       // see code in Universe::initialize_heap().
1460       Universe::set_narrow_oop_use_implicit_null_checks(false);
1461     }
1462 #endif //  _WIN64
1463   } else {
1464     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1465       warning("Max heap size too large for Compressed Oops");
1466       FLAG_SET_DEFAULT(UseCompressedOops, false);
1467       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1468     }
1469   }
1470 #endif // _LP64
1471 #endif // ZERO
1472 }
1473 
1474 
1475 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1476 // set_use_compressed_oops().
1477 void Arguments::set_use_compressed_klass_ptrs() {
1478 #ifndef ZERO
1479 #ifdef _LP64
1480   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1481   if (!UseCompressedOops) {
1482     if (UseCompressedClassPointers) {
1483       warning("UseCompressedClassPointers requires UseCompressedOops");
1484     }
1485     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1486   } else {
1487     // Turn on UseCompressedClassPointers too
1488     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1489       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1490     }
1491     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1492     if (UseCompressedClassPointers) {
1493       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1494         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1495         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1496       }
1497     }
1498   }
1499 #endif // _LP64
1500 #endif // !ZERO
1501 }
1502 
1503 void Arguments::set_conservative_max_heap_alignment() {
1504   // The conservative maximum required alignment for the heap is the maximum of
1505   // the alignments imposed by several sources: any requirements from the heap
1506   // itself, the collector policy and the maximum page size we may run the VM
1507   // with.
1508   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1509 #if INCLUDE_ALL_GCS
1510   if (UseParallelGC) {
1511     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1512   } else if (UseG1GC) {
1513     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1514   }
1515 #endif // INCLUDE_ALL_GCS
1516   _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1517     CollectorPolicy::compute_heap_alignment());
1518 }
1519 
1520 void Arguments::set_ergonomics_flags() {
1521 
1522   if (os::is_server_class_machine()) {
1523     // If no other collector is requested explicitly,
1524     // let the VM select the collector based on
1525     // machine class and automatic selection policy.
1526     if (!UseSerialGC &&
1527         !UseConcMarkSweepGC &&
1528         !UseG1GC &&
1529         !UseParNewGC &&
1530         FLAG_IS_DEFAULT(UseParallelGC)) {
1531       if (should_auto_select_low_pause_collector()) {
1532         FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1533       } else {
1534         FLAG_SET_ERGO(bool, UseParallelGC, true);
1535       }
1536     }
1537   }
1538 #ifdef COMPILER2
1539   // Shared spaces work fine with other GCs but causes bytecode rewriting
1540   // to be disabled, which hurts interpreter performance and decreases
1541   // server performance.  When -server is specified, keep the default off
1542   // unless it is asked for.  Future work: either add bytecode rewriting
1543   // at link time, or rewrite bytecodes in non-shared methods.
1544   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1545       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1546     no_shared_spaces();
1547   }
1548 #endif
1549 
1550   set_conservative_max_heap_alignment();
1551 
1552 #ifndef ZERO
1553 #ifdef _LP64
1554   set_use_compressed_oops();
1555 
1556   // set_use_compressed_klass_ptrs() must be called after calling
1557   // set_use_compressed_oops().
1558   set_use_compressed_klass_ptrs();
1559 
1560   // Also checks that certain machines are slower with compressed oops
1561   // in vm_version initialization code.
1562 #endif // _LP64
1563 #endif // !ZERO
1564 }
1565 
1566 void Arguments::set_parallel_gc_flags() {
1567   assert(UseParallelGC || UseParallelOldGC, "Error");
1568   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1569   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1570     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1571   }
1572   FLAG_SET_DEFAULT(UseParallelGC, true);
1573 
1574   // If no heap maximum was requested explicitly, use some reasonable fraction
1575   // of the physical memory, up to a maximum of 1GB.
1576   FLAG_SET_DEFAULT(ParallelGCThreads,
1577                    Abstract_VM_Version::parallel_worker_threads());
1578   if (ParallelGCThreads == 0) {
1579     jio_fprintf(defaultStream::error_stream(),
1580         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1581     vm_exit(1);
1582   }
1583 
1584   if (UseAdaptiveSizePolicy) {
1585     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1586     // unless the user actually sets these flags.
1587     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1588       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1589     }
1590     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1591       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1592     }
1593   }
1594 
1595   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1596   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1597   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1598   // See CR 6362902 for details.
1599   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1600     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1601        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1602     }
1603     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1604       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1605     }
1606   }
1607 
1608   if (UseParallelOldGC) {
1609     // Par compact uses lower default values since they are treated as
1610     // minimums.  These are different defaults because of the different
1611     // interpretation and are not ergonomically set.
1612     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1613       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1614     }
1615   }
1616 }
1617 
1618 void Arguments::set_g1_gc_flags() {
1619   assert(UseG1GC, "Error");
1620 #ifdef COMPILER1
1621   FastTLABRefill = false;
1622 #endif
1623   FLAG_SET_DEFAULT(ParallelGCThreads,
1624                      Abstract_VM_Version::parallel_worker_threads());
1625   if (ParallelGCThreads == 0) {
1626     FLAG_SET_DEFAULT(ParallelGCThreads,
1627                      Abstract_VM_Version::parallel_worker_threads());
1628   }
1629 
1630   // MarkStackSize will be set (if it hasn't been set by the user)
1631   // when concurrent marking is initialized.
1632   // Its value will be based upon the number of parallel marking threads.
1633   // But we do set the maximum mark stack size here.
1634   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1635     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1636   }
1637 
1638   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1639     // In G1, we want the default GC overhead goal to be higher than
1640     // say in PS. So we set it here to 10%. Otherwise the heap might
1641     // be expanded more aggressively than we would like it to. In
1642     // fact, even 10% seems to not be high enough in some cases
1643     // (especially small GC stress tests that the main thing they do
1644     // is allocation). We might consider increase it further.
1645     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1646   }
1647 
1648   if (PrintGCDetails && Verbose) {
1649     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1650       MarkStackSize / K, MarkStackSizeMax / K);
1651     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1652   }
1653 }
1654 
1655 julong Arguments::limit_by_allocatable_memory(julong limit) {
1656   julong max_allocatable;
1657   julong result = limit;
1658   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1659     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1660   }
1661   return result;
1662 }
1663 
1664 // Use static initialization to get the default before parsing
1665 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1666 
1667 void Arguments::set_heap_size() {
1668   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1669     // Deprecated flag
1670     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1671   }
1672 
1673   const julong phys_mem =
1674     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1675                             : (julong)MaxRAM;
1676 
1677   // If the maximum heap size has not been set with -Xmx,
1678   // then set it as fraction of the size of physical memory,
1679   // respecting the maximum and minimum sizes of the heap.
1680   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1681     julong reasonable_max = phys_mem / MaxRAMFraction;
1682 
1683     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1684       // Small physical memory, so use a minimum fraction of it for the heap
1685       reasonable_max = phys_mem / MinRAMFraction;
1686     } else {
1687       // Not-small physical memory, so require a heap at least
1688       // as large as MaxHeapSize
1689       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1690     }
1691     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1692       // Limit the heap size to ErgoHeapSizeLimit
1693       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1694     }
1695     if (UseCompressedOops) {
1696       // Limit the heap size to the maximum possible when using compressed oops
1697       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1698 
1699       // HeapBaseMinAddress can be greater than default but not less than.
1700       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1701         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1702           if (PrintMiscellaneous && Verbose) {  // matches compressed oops printing flags
1703             jio_fprintf(defaultStream::error_stream(),
1704                         "HeapBaseMinAddress must be at least " UINTX_FORMAT
1705                         " (" UINTX_FORMAT "G) which is greater than value given "
1706                         UINTX_FORMAT "\n",
1707                         DefaultHeapBaseMinAddress,
1708                         DefaultHeapBaseMinAddress/G,
1709                         HeapBaseMinAddress);
1710           }
1711           FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1712         }
1713       }
1714 
1715       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1716         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1717         // but it should be not less than default MaxHeapSize.
1718         max_coop_heap -= HeapBaseMinAddress;
1719       }
1720       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1721     }
1722     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1723 
1724     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1725       // An initial heap size was specified on the command line,
1726       // so be sure that the maximum size is consistent.  Done
1727       // after call to limit_by_allocatable_memory because that
1728       // method might reduce the allocation size.
1729       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1730     }
1731 
1732     if (PrintGCDetails && Verbose) {
1733       // Cannot use gclog_or_tty yet.
1734       tty->print_cr("  Maximum heap size " SIZE_FORMAT, reasonable_max);
1735     }
1736     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1737   }
1738 
1739   // If the minimum or initial heap_size have not been set or requested to be set
1740   // ergonomically, set them accordingly.
1741   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1742     julong reasonable_minimum = (julong)(OldSize + NewSize);
1743 
1744     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1745 
1746     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1747 
1748     if (InitialHeapSize == 0) {
1749       julong reasonable_initial = phys_mem / InitialRAMFraction;
1750 
1751       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1752       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1753 
1754       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1755 
1756       if (PrintGCDetails && Verbose) {
1757         // Cannot use gclog_or_tty yet.
1758         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1759       }
1760       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1761     }
1762     // If the minimum heap size has not been set (via -Xms),
1763     // synchronize with InitialHeapSize to avoid errors with the default value.
1764     if (min_heap_size() == 0) {
1765       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1766       if (PrintGCDetails && Verbose) {
1767         // Cannot use gclog_or_tty yet.
1768         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1769       }
1770     }
1771   }
1772 }
1773 
1774 // This must be called after ergonomics because we want bytecode rewriting
1775 // if the server compiler is used, or if UseSharedSpaces is disabled.
1776 void Arguments::set_bytecode_flags() {
1777   // Better not attempt to store into a read-only space.
1778   if (UseSharedSpaces) {
1779     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1780     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1781   }
1782 
1783   if (!RewriteBytecodes) {
1784     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1785   }
1786 }
1787 
1788 // Aggressive optimization flags  -XX:+AggressiveOpts
1789 void Arguments::set_aggressive_opts_flags() {
1790 #ifdef COMPILER2
1791   if (AggressiveUnboxing) {
1792     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1793       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1794     } else if (!EliminateAutoBox) {
1795       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1796       AggressiveUnboxing = false;
1797     }
1798     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1799       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1800     } else if (!DoEscapeAnalysis) {
1801       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1802       AggressiveUnboxing = false;
1803     }
1804   }
1805   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1806     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1807       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1808     }
1809     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1810       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1811     }
1812 
1813     // Feed the cache size setting into the JDK
1814     char buffer[1024];
1815     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1816     add_property(buffer);
1817   }
1818   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1819     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1820   }
1821 #endif
1822 
1823   if (AggressiveOpts) {
1824 // Sample flag setting code
1825 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1826 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1827 //    }
1828   }
1829 }
1830 
1831 //===========================================================================================================
1832 // Parsing of java.compiler property
1833 
1834 void Arguments::process_java_compiler_argument(char* arg) {
1835   // For backwards compatibility, Djava.compiler=NONE or ""
1836   // causes us to switch to -Xint mode UNLESS -Xdebug
1837   // is also specified.
1838   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1839     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1840   }
1841 }
1842 
1843 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1844   _sun_java_launcher = strdup(launcher);
1845 }
1846 
1847 bool Arguments::created_by_java_launcher() {
1848   assert(_sun_java_launcher != NULL, "property must have value");
1849   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1850 }
1851 
1852 bool Arguments::sun_java_launcher_is_altjvm() {
1853   return _sun_java_launcher_is_altjvm;
1854 }
1855 
1856 //===========================================================================================================
1857 // Parsing of main arguments
1858 
1859 bool Arguments::verify_interval(uintx val, uintx min,
1860                                 uintx max, const char* name) {
1861   // Returns true iff value is in the inclusive interval [min..max]
1862   // false, otherwise.
1863   if (val >= min && val <= max) {
1864     return true;
1865   }
1866   jio_fprintf(defaultStream::error_stream(),
1867               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1868               " and " UINTX_FORMAT "\n",
1869               name, val, min, max);
1870   return false;
1871 }
1872 
1873 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1874   // Returns true if given value is at least specified min threshold
1875   // false, otherwise.
1876   if (val >= min ) {
1877       return true;
1878   }
1879   jio_fprintf(defaultStream::error_stream(),
1880               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1881               name, val, min);
1882   return false;
1883 }
1884 
1885 bool Arguments::verify_percentage(uintx value, const char* name) {
1886   if (is_percentage(value)) {
1887     return true;
1888   }
1889   jio_fprintf(defaultStream::error_stream(),
1890               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1891               name, value);
1892   return false;
1893 }
1894 
1895 #if !INCLUDE_ALL_GCS
1896 #ifdef ASSERT
1897 static bool verify_serial_gc_flags() {
1898   return (UseSerialGC &&
1899         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1900           UseParallelGC || UseParallelOldGC));
1901 }
1902 #endif // ASSERT
1903 #endif // INCLUDE_ALL_GCS
1904 
1905 // check if do gclog rotation
1906 // +UseGCLogFileRotation is a must,
1907 // no gc log rotation when log file not supplied or
1908 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1909 void check_gclog_consistency() {
1910   if (UseGCLogFileRotation) {
1911     if ((Arguments::gc_log_filename() == NULL) ||
1912         (NumberOfGCLogFiles == 0)  ||
1913         (GCLogFileSize == 0)) {
1914       jio_fprintf(defaultStream::output_stream(),
1915                   "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"
1916                   "where num_of_file > 0 and num_of_size > 0\n"
1917                   "GC log rotation is turned off\n");
1918       UseGCLogFileRotation = false;
1919     }
1920   }
1921 
1922   if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1923         FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1924         jio_fprintf(defaultStream::output_stream(),
1925                     "GCLogFileSize changed to minimum 8K\n");
1926   }
1927 }
1928 
1929 // This function is called for -Xloggc:<filename>, it can be used
1930 // to check if a given file name(or string) conforms to the following
1931 // specification:
1932 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1933 // %p and %t only allowed once. We only limit usage of filename not path
1934 bool is_filename_valid(const char *file_name) {
1935   const char* p = file_name;
1936   char file_sep = os::file_separator()[0];
1937   const char* cp;
1938   // skip prefix path
1939   for (cp = file_name; *cp != '\0'; cp++) {
1940     if (*cp == '/' || *cp == file_sep) {
1941       p = cp + 1;
1942     }
1943   }
1944 
1945   int count_p = 0;
1946   int count_t = 0;
1947   while (*p != '\0') {
1948     if ((*p >= '0' && *p <= '9') ||
1949         (*p >= 'A' && *p <= 'Z') ||
1950         (*p >= 'a' && *p <= 'z') ||
1951          *p == '-'               ||
1952          *p == '_'               ||
1953          *p == '.') {
1954        p++;
1955        continue;
1956     }
1957     if (*p == '%') {
1958       if(*(p + 1) == 'p') {
1959         p += 2;
1960         count_p ++;
1961         continue;
1962       }
1963       if (*(p + 1) == 't') {
1964         p += 2;
1965         count_t ++;
1966         continue;
1967       }
1968     }
1969     return false;
1970   }
1971   return count_p < 2 && count_t < 2;
1972 }
1973 
1974 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1975   if (!is_percentage(min_heap_free_ratio)) {
1976     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1977     return false;
1978   }
1979   if (min_heap_free_ratio > MaxHeapFreeRatio) {
1980     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1981                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1982                   MaxHeapFreeRatio);
1983     return false;
1984   }
1985   return true;
1986 }
1987 
1988 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1989   if (!is_percentage(max_heap_free_ratio)) {
1990     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1991     return false;
1992   }
1993   if (max_heap_free_ratio < MinHeapFreeRatio) {
1994     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1995                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1996                   MinHeapFreeRatio);
1997     return false;
1998   }
1999   return true;
2000 }
2001 
2002 // Check consistency of GC selection
2003 bool Arguments::check_gc_consistency() {
2004   check_gclog_consistency();
2005   bool status = true;
2006   // Ensure that the user has not selected conflicting sets
2007   // of collectors. [Note: this check is merely a user convenience;
2008   // collectors over-ride each other so that only a non-conflicting
2009   // set is selected; however what the user gets is not what they
2010   // may have expected from the combination they asked for. It's
2011   // better to reduce user confusion by not allowing them to
2012   // select conflicting combinations.
2013   uint i = 0;
2014   if (UseSerialGC)                       i++;
2015   if (UseConcMarkSweepGC || UseParNewGC) i++;
2016   if (UseParallelGC || UseParallelOldGC) i++;
2017   if (UseG1GC)                           i++;
2018   if (i > 1) {
2019     jio_fprintf(defaultStream::error_stream(),
2020                 "Conflicting collector combinations in option list; "
2021                 "please refer to the release notes for the combinations "
2022                 "allowed\n");
2023     status = false;
2024   }
2025   return status;
2026 }
2027 
2028 void Arguments::check_deprecated_gcs() {
2029   if (UseConcMarkSweepGC && !UseParNewGC) {
2030     warning("Using the DefNew young collector with the CMS collector is deprecated "
2031         "and will likely be removed in a future release");
2032   }
2033 
2034   if (UseParNewGC && !UseConcMarkSweepGC) {
2035     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2036     // set up UseSerialGC properly, so that can't be used in the check here.
2037     warning("Using the ParNew young collector with the Serial old collector is deprecated "
2038         "and will likely be removed in a future release");
2039   }
2040 
2041   if (CMSIncrementalMode) {
2042     warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2043   }
2044 }
2045 
2046 void Arguments::check_deprecated_gc_flags() {
2047   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2048     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2049             "and will likely be removed in future release");
2050   }
2051   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2052     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2053         "Use MaxRAMFraction instead.");
2054   }
2055   if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2056     warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2057   }
2058   if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2059     warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2060   }
2061   if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2062     warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2063   }
2064 }
2065 
2066 // Check stack pages settings
2067 bool Arguments::check_stack_pages()
2068 {
2069   bool status = true;
2070   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2071   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2072   // greater stack shadow pages can't generate instruction to bang stack
2073   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2074   return status;
2075 }
2076 
2077 // Check the consistency of vm_init_args
2078 bool Arguments::check_vm_args_consistency() {
2079   // Method for adding checks for flag consistency.
2080   // The intent is to warn the user of all possible conflicts,
2081   // before returning an error.
2082   // Note: Needs platform-dependent factoring.
2083   bool status = true;
2084 
2085   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2086   // builds so the cost of stack banging can be measured.
2087 #if (defined(PRODUCT) && defined(SOLARIS))
2088   if (!UseBoundThreads && !UseStackBanging) {
2089     jio_fprintf(defaultStream::error_stream(),
2090                 "-UseStackBanging conflicts with -UseBoundThreads\n");
2091 
2092      status = false;
2093   }
2094 #endif
2095 
2096   if (TLABRefillWasteFraction == 0) {
2097     jio_fprintf(defaultStream::error_stream(),
2098                 "TLABRefillWasteFraction should be a denominator, "
2099                 "not " SIZE_FORMAT "\n",
2100                 TLABRefillWasteFraction);
2101     status = false;
2102   }
2103 
2104   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2105                               "AdaptiveSizePolicyWeight");
2106   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2107 
2108   // Divide by bucket size to prevent a large size from causing rollover when
2109   // calculating amount of memory needed to be allocated for the String table.
2110   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2111     (max_uintx / StringTable::bucket_size()), "StringTable size");
2112 
2113   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2114     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2115 
2116   {
2117     // Using "else if" below to avoid printing two error messages if min > max.
2118     // This will also prevent us from reporting both min>100 and max>100 at the
2119     // same time, but that is less annoying than printing two identical errors IMHO.
2120     FormatBuffer<80> err_msg("");
2121     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2122       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2123       status = false;
2124     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2125       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2126       status = false;
2127     }
2128   }
2129 
2130   // Min/MaxMetaspaceFreeRatio
2131   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2132   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2133 
2134   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2135     jio_fprintf(defaultStream::error_stream(),
2136                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2137                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2138                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2139                 MinMetaspaceFreeRatio,
2140                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2141                 MaxMetaspaceFreeRatio);
2142     status = false;
2143   }
2144 
2145   // Trying to keep 100% free is not practical
2146   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2147 
2148   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2149     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2150   }
2151 
2152   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2153     // Settings to encourage splitting.
2154     if (!FLAG_IS_CMDLINE(NewRatio)) {
2155       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2156     }
2157     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2158       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2159     }
2160   }
2161 
2162   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2163   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2164   if (GCTimeLimit == 100) {
2165     // Turn off gc-overhead-limit-exceeded checks
2166     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2167   }
2168 
2169   status = status && check_gc_consistency();
2170   status = status && check_stack_pages();
2171 
2172   if (CMSIncrementalMode) {
2173     if (!UseConcMarkSweepGC) {
2174       jio_fprintf(defaultStream::error_stream(),
2175                   "error:  invalid argument combination.\n"
2176                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2177                   "selected in order\nto use CMSIncrementalMode.\n");
2178       status = false;
2179     } else {
2180       status = status && verify_percentage(CMSIncrementalDutyCycle,
2181                                   "CMSIncrementalDutyCycle");
2182       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2183                                   "CMSIncrementalDutyCycleMin");
2184       status = status && verify_percentage(CMSIncrementalSafetyFactor,
2185                                   "CMSIncrementalSafetyFactor");
2186       status = status && verify_percentage(CMSIncrementalOffset,
2187                                   "CMSIncrementalOffset");
2188       status = status && verify_percentage(CMSExpAvgFactor,
2189                                   "CMSExpAvgFactor");
2190       // If it was not set on the command line, set
2191       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2192       if (CMSInitiatingOccupancyFraction < 0) {
2193         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2194       }
2195     }
2196   }
2197 
2198   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2199   // insists that we hold the requisite locks so that the iteration is
2200   // MT-safe. For the verification at start-up and shut-down, we don't
2201   // yet have a good way of acquiring and releasing these locks,
2202   // which are not visible at the CollectedHeap level. We want to
2203   // be able to acquire these locks and then do the iteration rather
2204   // than just disable the lock verification. This will be fixed under
2205   // bug 4788986.
2206   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2207     if (VerifyDuringStartup) {
2208       warning("Heap verification at start-up disabled "
2209               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2210       VerifyDuringStartup = false; // Disable verification at start-up
2211     }
2212 
2213     if (VerifyBeforeExit) {
2214       warning("Heap verification at shutdown disabled "
2215               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2216       VerifyBeforeExit = false; // Disable verification at shutdown
2217     }
2218   }
2219 
2220   // Note: only executed in non-PRODUCT mode
2221   if (!UseAsyncConcMarkSweepGC &&
2222       (ExplicitGCInvokesConcurrent ||
2223        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2224     jio_fprintf(defaultStream::error_stream(),
2225                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2226                 " with -UseAsyncConcMarkSweepGC");
2227     status = false;
2228   }
2229 
2230   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2231 
2232 #if INCLUDE_ALL_GCS
2233   if (UseG1GC) {
2234     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2235     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2236     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2237 
2238     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2239                                          "InitiatingHeapOccupancyPercent");
2240     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2241                                         "G1RefProcDrainInterval");
2242     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2243                                         "G1ConcMarkStepDurationMillis");
2244     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2245                                        "G1ConcRSHotCardLimit");
2246     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2247                                        "G1ConcRSLogCacheSize");
2248   }
2249   if (UseConcMarkSweepGC) {
2250     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2251     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2252     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2253     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2254 
2255     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2256 
2257     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2258     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2259     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2260 
2261     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2262 
2263     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2264     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2265 
2266     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2267     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2268     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2269 
2270     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2271 
2272     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2273 
2274     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2275     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2276     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2277     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2278     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2279   }
2280 
2281   if (UseParallelGC || UseParallelOldGC) {
2282     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2283     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2284 
2285     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2286     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2287 
2288     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2289     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2290 
2291     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2292 
2293     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2294   }
2295 #endif // INCLUDE_ALL_GCS
2296 
2297   status = status && verify_interval(RefDiscoveryPolicy,
2298                                      ReferenceProcessor::DiscoveryPolicyMin,
2299                                      ReferenceProcessor::DiscoveryPolicyMax,
2300                                      "RefDiscoveryPolicy");
2301 
2302   // Limit the lower bound of this flag to 1 as it is used in a division
2303   // expression.
2304   status = status && verify_interval(TLABWasteTargetPercent,
2305                                      1, 100, "TLABWasteTargetPercent");
2306 
2307   status = status && verify_object_alignment();
2308 
2309   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2310                                       "CompressedClassSpaceSize");
2311 
2312   status = status && verify_interval(MarkStackSizeMax,
2313                                   1, (max_jint - 1), "MarkStackSizeMax");
2314   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2315 
2316   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2317 
2318   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2319 
2320   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2321 
2322   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2323   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2324 
2325   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2326 
2327   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2328   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2329   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2330   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2331 
2332   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2333   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2334 
2335   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2336   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2337   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2338 
2339   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2340   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2341 
2342   // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2343   // just for that, so hardcode here.
2344   status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2345   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2346   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2347   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2348 
2349   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2350 
2351   if (PrintNMTStatistics) {
2352 #if INCLUDE_NMT
2353     if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2354 #endif // INCLUDE_NMT
2355       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2356       PrintNMTStatistics = false;
2357 #if INCLUDE_NMT
2358     }
2359 #endif
2360   }
2361 
2362   // Need to limit the extent of the padding to reasonable size.
2363   // 8K is well beyond the reasonable HW cache line size, even with the
2364   // aggressive prefetching, while still leaving the room for segregating
2365   // among the distinct pages.
2366   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2367     jio_fprintf(defaultStream::error_stream(),
2368                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2369                 ContendedPaddingWidth, 0, 8192);
2370     status = false;
2371   }
2372 
2373   // Need to enforce the padding not to break the existing field alignments.
2374   // It is sufficient to check against the largest type size.
2375   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2376     jio_fprintf(defaultStream::error_stream(),
2377                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2378                 ContendedPaddingWidth, BytesPerLong);
2379     status = false;
2380   }
2381 
2382   // Check lower bounds of the code cache
2383   // Template Interpreter code is approximately 3X larger in debug builds.
2384   uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2385   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2386     jio_fprintf(defaultStream::error_stream(),
2387                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2388                 os::vm_page_size()/K);
2389     status = false;
2390   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2391     jio_fprintf(defaultStream::error_stream(),
2392                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2393                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2394     status = false;
2395   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2396     jio_fprintf(defaultStream::error_stream(),
2397                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2398                 min_code_cache_size/K);
2399     status = false;
2400   } else if (ReservedCodeCacheSize > 2*G) {
2401     // Code cache size larger than MAXINT is not supported.
2402     jio_fprintf(defaultStream::error_stream(),
2403                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2404                 (2*G)/M);
2405     status = false;
2406   }
2407 
2408   status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2409   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2410 
2411   // TieredCompilation needs at least 2 compiler threads.
2412   const int num_min_compiler_threads = (TieredCompilation) ? 2 : 1;
2413   status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount");
2414 
2415   return status;
2416 }
2417 
2418 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2419   const char* option_type) {
2420   if (ignore) return false;
2421 
2422   const char* spacer = " ";
2423   if (option_type == NULL) {
2424     option_type = ++spacer; // Set both to the empty string.
2425   }
2426 
2427   if (os::obsolete_option(option)) {
2428     jio_fprintf(defaultStream::error_stream(),
2429                 "Obsolete %s%soption: %s\n", option_type, spacer,
2430       option->optionString);
2431     return false;
2432   } else {
2433     jio_fprintf(defaultStream::error_stream(),
2434                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2435       option->optionString);
2436     return true;
2437   }
2438 }
2439 
2440 static const char* user_assertion_options[] = {
2441   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2442 };
2443 
2444 static const char* system_assertion_options[] = {
2445   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2446 };
2447 
2448 // Return true if any of the strings in null-terminated array 'names' matches.
2449 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2450 // the option must match exactly.
2451 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2452   bool tail_allowed) {
2453   for (/* empty */; *names != NULL; ++names) {
2454     if (match_option(option, *names, tail)) {
2455       if (**tail == '\0' || tail_allowed && **tail == ':') {
2456         return true;
2457       }
2458     }
2459   }
2460   return false;
2461 }
2462 
2463 bool Arguments::parse_uintx(const char* value,
2464                             uintx* uintx_arg,
2465                             uintx min_size) {
2466 
2467   // Check the sign first since atomull() parses only unsigned values.
2468   bool value_is_positive = !(*value == '-');
2469 
2470   if (value_is_positive) {
2471     julong n;
2472     bool good_return = atomull(value, &n);
2473     if (good_return) {
2474       bool above_minimum = n >= min_size;
2475       bool value_is_too_large = n > max_uintx;
2476 
2477       if (above_minimum && !value_is_too_large) {
2478         *uintx_arg = n;
2479         return true;
2480       }
2481     }
2482   }
2483   return false;
2484 }
2485 
2486 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2487                                                   julong* long_arg,
2488                                                   julong min_size) {
2489   if (!atomull(s, long_arg)) return arg_unreadable;
2490   return check_memory_size(*long_arg, min_size);
2491 }
2492 
2493 // Parse JavaVMInitArgs structure
2494 
2495 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2496   // For components of the system classpath.
2497   SysClassPath scp(Arguments::get_sysclasspath());
2498   bool scp_assembly_required = false;
2499 
2500   // Save default settings for some mode flags
2501   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2502   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2503   Arguments::_ClipInlining             = ClipInlining;
2504   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2505 
2506   // Setup flags for mixed which is the default
2507   set_mode_flags(_mixed);
2508 
2509   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2510   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2511   if (result != JNI_OK) {
2512     return result;
2513   }
2514 
2515   // Parse JavaVMInitArgs structure passed in
2516   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2517   if (result != JNI_OK) {
2518     return result;
2519   }
2520 
2521   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2522   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2523   if (result != JNI_OK) {
2524     return result;
2525   }
2526 
2527   // Do final processing now that all arguments have been parsed
2528   result = finalize_vm_init_args(&scp, scp_assembly_required);
2529   if (result != JNI_OK) {
2530     return result;
2531   }
2532 
2533   return JNI_OK;
2534 }
2535 
2536 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2537 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2538 // are dealing with -agentpath (case where name is a path), otherwise with
2539 // -agentlib
2540 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2541   char *_name;
2542   const char *_hprof = "hprof", *_jdwp = "jdwp";
2543   size_t _len_hprof, _len_jdwp, _len_prefix;
2544 
2545   if (is_path) {
2546     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2547       return false;
2548     }
2549 
2550     _name++;  // skip past last path separator
2551     _len_prefix = strlen(JNI_LIB_PREFIX);
2552 
2553     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2554       return false;
2555     }
2556 
2557     _name += _len_prefix;
2558     _len_hprof = strlen(_hprof);
2559     _len_jdwp = strlen(_jdwp);
2560 
2561     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2562       _name += _len_hprof;
2563     }
2564     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2565       _name += _len_jdwp;
2566     }
2567     else {
2568       return false;
2569     }
2570 
2571     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2572       return false;
2573     }
2574 
2575     return true;
2576   }
2577 
2578   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2579     return true;
2580   }
2581 
2582   return false;
2583 }
2584 
2585 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2586                                        SysClassPath* scp_p,
2587                                        bool* scp_assembly_required_p,
2588                                        Flag::Flags origin) {
2589   // Remaining part of option string
2590   const char* tail;
2591 
2592   // iterate over arguments
2593   for (int index = 0; index < args->nOptions; index++) {
2594     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2595 
2596     const JavaVMOption* option = args->options + index;
2597 
2598     if (!match_option(option, "-Djava.class.path", &tail) &&
2599         !match_option(option, "-Dsun.java.command", &tail) &&
2600         !match_option(option, "-Dsun.java.launcher", &tail)) {
2601 
2602         // add all jvm options to the jvm_args string. This string
2603         // is used later to set the java.vm.args PerfData string constant.
2604         // the -Djava.class.path and the -Dsun.java.command options are
2605         // omitted from jvm_args string as each have their own PerfData
2606         // string constant object.
2607         build_jvm_args(option->optionString);
2608     }
2609 
2610     // -verbose:[class/gc/jni]
2611     if (match_option(option, "-verbose", &tail)) {
2612       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2613         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2614         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2615       } else if (!strcmp(tail, ":gc")) {
2616         FLAG_SET_CMDLINE(bool, PrintGC, true);
2617       } else if (!strcmp(tail, ":jni")) {
2618         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2619       }
2620     // -da / -ea / -disableassertions / -enableassertions
2621     // These accept an optional class/package name separated by a colon, e.g.,
2622     // -da:java.lang.Thread.
2623     } else if (match_option(option, user_assertion_options, &tail, true)) {
2624       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2625       if (*tail == '\0') {
2626         JavaAssertions::setUserClassDefault(enable);
2627       } else {
2628         assert(*tail == ':', "bogus match by match_option()");
2629         JavaAssertions::addOption(tail + 1, enable);
2630       }
2631     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2632     } else if (match_option(option, system_assertion_options, &tail, false)) {
2633       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2634       JavaAssertions::setSystemClassDefault(enable);
2635     // -bootclasspath:
2636     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2637       scp_p->reset_path(tail);
2638       *scp_assembly_required_p = true;
2639     // -bootclasspath/a:
2640     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2641       scp_p->add_suffix(tail);
2642       *scp_assembly_required_p = true;
2643     // -bootclasspath/p:
2644     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2645       scp_p->add_prefix(tail);
2646       *scp_assembly_required_p = true;
2647     // -Xrun
2648     } else if (match_option(option, "-Xrun", &tail)) {
2649       if (tail != NULL) {
2650         const char* pos = strchr(tail, ':');
2651         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2652         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2653         name[len] = '\0';
2654 
2655         char *options = NULL;
2656         if(pos != NULL) {
2657           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2658           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2659         }
2660 #if !INCLUDE_JVMTI
2661         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2662           jio_fprintf(defaultStream::error_stream(),
2663             "Profiling and debugging agents are not supported in this VM\n");
2664           return JNI_ERR;
2665         }
2666 #endif // !INCLUDE_JVMTI
2667         add_init_library(name, options);
2668       }
2669     // -agentlib and -agentpath
2670     } else if (match_option(option, "-agentlib:", &tail) ||
2671           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2672       if(tail != NULL) {
2673         const char* pos = strchr(tail, '=');
2674         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2675         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2676         name[len] = '\0';
2677 
2678         char *options = NULL;
2679         if(pos != NULL) {
2680           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2681         }
2682 #if !INCLUDE_JVMTI
2683         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2684           jio_fprintf(defaultStream::error_stream(),
2685             "Profiling and debugging agents are not supported in this VM\n");
2686           return JNI_ERR;
2687         }
2688 #endif // !INCLUDE_JVMTI
2689         add_init_agent(name, options, is_absolute_path);
2690       }
2691     // -javaagent
2692     } else if (match_option(option, "-javaagent:", &tail)) {
2693 #if !INCLUDE_JVMTI
2694       jio_fprintf(defaultStream::error_stream(),
2695         "Instrumentation agents are not supported in this VM\n");
2696       return JNI_ERR;
2697 #else
2698       if(tail != NULL) {
2699         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2700         add_init_agent("instrument", options, false);
2701       }
2702 #endif // !INCLUDE_JVMTI
2703     // -Xnoclassgc
2704     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2705       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2706     // -Xincgc: i-CMS
2707     } else if (match_option(option, "-Xincgc", &tail)) {
2708       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2709       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2710     // -Xnoincgc: no i-CMS
2711     } else if (match_option(option, "-Xnoincgc", &tail)) {
2712       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2713       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2714     // -Xconcgc
2715     } else if (match_option(option, "-Xconcgc", &tail)) {
2716       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2717     // -Xnoconcgc
2718     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2719       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2720     // -Xbatch
2721     } else if (match_option(option, "-Xbatch", &tail)) {
2722       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2723     // -Xmn for compatibility with other JVM vendors
2724     } else if (match_option(option, "-Xmn", &tail)) {
2725       julong long_initial_young_size = 0;
2726       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2727       if (errcode != arg_in_range) {
2728         jio_fprintf(defaultStream::error_stream(),
2729                     "Invalid initial young generation size: %s\n", option->optionString);
2730         describe_range_error(errcode);
2731         return JNI_EINVAL;
2732       }
2733       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2734       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2735     // -Xms
2736     } else if (match_option(option, "-Xms", &tail)) {
2737       julong long_initial_heap_size = 0;
2738       // an initial heap size of 0 means automatically determine
2739       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2740       if (errcode != arg_in_range) {
2741         jio_fprintf(defaultStream::error_stream(),
2742                     "Invalid initial heap size: %s\n", option->optionString);
2743         describe_range_error(errcode);
2744         return JNI_EINVAL;
2745       }
2746       set_min_heap_size((uintx)long_initial_heap_size);
2747       // Currently the minimum size and the initial heap sizes are the same.
2748       // Can be overridden with -XX:InitialHeapSize.
2749       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2750     // -Xmx
2751     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2752       julong long_max_heap_size = 0;
2753       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2754       if (errcode != arg_in_range) {
2755         jio_fprintf(defaultStream::error_stream(),
2756                     "Invalid maximum heap size: %s\n", option->optionString);
2757         describe_range_error(errcode);
2758         return JNI_EINVAL;
2759       }
2760       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2761     // Xmaxf
2762     } else if (match_option(option, "-Xmaxf", &tail)) {
2763       char* err;
2764       int maxf = (int)(strtod(tail, &err) * 100);
2765       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2766         jio_fprintf(defaultStream::error_stream(),
2767                     "Bad max heap free percentage size: %s\n",
2768                     option->optionString);
2769         return JNI_EINVAL;
2770       } else {
2771         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2772       }
2773     // Xminf
2774     } else if (match_option(option, "-Xminf", &tail)) {
2775       char* err;
2776       int minf = (int)(strtod(tail, &err) * 100);
2777       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2778         jio_fprintf(defaultStream::error_stream(),
2779                     "Bad min heap free percentage size: %s\n",
2780                     option->optionString);
2781         return JNI_EINVAL;
2782       } else {
2783         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2784       }
2785     // -Xss
2786     } else if (match_option(option, "-Xss", &tail)) {
2787       julong long_ThreadStackSize = 0;
2788       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2789       if (errcode != arg_in_range) {
2790         jio_fprintf(defaultStream::error_stream(),
2791                     "Invalid thread stack size: %s\n", option->optionString);
2792         describe_range_error(errcode);
2793         return JNI_EINVAL;
2794       }
2795       // Internally track ThreadStackSize in units of 1024 bytes.
2796       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2797                               round_to((int)long_ThreadStackSize, K) / K);
2798     // -Xoss
2799     } else if (match_option(option, "-Xoss", &tail)) {
2800           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2801     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2802       julong long_CodeCacheExpansionSize = 0;
2803       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2804       if (errcode != arg_in_range) {
2805         jio_fprintf(defaultStream::error_stream(),
2806                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2807                    os::vm_page_size()/K);
2808         return JNI_EINVAL;
2809       }
2810       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2811     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2812                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2813       julong long_ReservedCodeCacheSize = 0;
2814 
2815       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2816       if (errcode != arg_in_range) {
2817         jio_fprintf(defaultStream::error_stream(),
2818                     "Invalid maximum code cache size: %s.\n", option->optionString);
2819         return JNI_EINVAL;
2820       }
2821       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2822       //-XX:IncreaseFirstTierCompileThresholdAt=
2823       } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2824         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2825         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2826           jio_fprintf(defaultStream::error_stream(),
2827                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2828                       option->optionString);
2829           return JNI_EINVAL;
2830         }
2831         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2832     // -green
2833     } else if (match_option(option, "-green", &tail)) {
2834       jio_fprintf(defaultStream::error_stream(),
2835                   "Green threads support not available\n");
2836           return JNI_EINVAL;
2837     // -native
2838     } else if (match_option(option, "-native", &tail)) {
2839           // HotSpot always uses native threads, ignore silently for compatibility
2840     // -Xsqnopause
2841     } else if (match_option(option, "-Xsqnopause", &tail)) {
2842           // EVM option, ignore silently for compatibility
2843     // -Xrs
2844     } else if (match_option(option, "-Xrs", &tail)) {
2845           // Classic/EVM option, new functionality
2846       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2847     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2848           // change default internal VM signals used - lower case for back compat
2849       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2850     // -Xoptimize
2851     } else if (match_option(option, "-Xoptimize", &tail)) {
2852           // EVM option, ignore silently for compatibility
2853     // -Xprof
2854     } else if (match_option(option, "-Xprof", &tail)) {
2855 #if INCLUDE_FPROF
2856       _has_profile = true;
2857 #else // INCLUDE_FPROF
2858       jio_fprintf(defaultStream::error_stream(),
2859         "Flat profiling is not supported in this VM.\n");
2860       return JNI_ERR;
2861 #endif // INCLUDE_FPROF
2862     // -Xconcurrentio
2863     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2864       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2865       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2866       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2867       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2868       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2869 
2870       // -Xinternalversion
2871     } else if (match_option(option, "-Xinternalversion", &tail)) {
2872       jio_fprintf(defaultStream::output_stream(), "%s\n",
2873                   VM_Version::internal_vm_info_string());
2874       vm_exit(0);
2875 #ifndef PRODUCT
2876     // -Xprintflags
2877     } else if (match_option(option, "-Xprintflags", &tail)) {
2878       CommandLineFlags::printFlags(tty, false);
2879       vm_exit(0);
2880 #endif
2881     // -D
2882     } else if (match_option(option, "-D", &tail)) {
2883       if (!add_property(tail)) {
2884         return JNI_ENOMEM;
2885       }
2886       // Out of the box management support
2887       if (match_option(option, "-Dcom.sun.management", &tail)) {
2888 #if INCLUDE_MANAGEMENT
2889         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2890 #else
2891         jio_fprintf(defaultStream::output_stream(),
2892           "-Dcom.sun.management is not supported in this VM.\n");
2893         return JNI_ERR;
2894 #endif
2895       }
2896     // -Xint
2897     } else if (match_option(option, "-Xint", &tail)) {
2898           set_mode_flags(_int);
2899     // -Xmixed
2900     } else if (match_option(option, "-Xmixed", &tail)) {
2901           set_mode_flags(_mixed);
2902     // -Xcomp
2903     } else if (match_option(option, "-Xcomp", &tail)) {
2904       // for testing the compiler; turn off all flags that inhibit compilation
2905           set_mode_flags(_comp);
2906     // -Xshare:dump
2907     } else if (match_option(option, "-Xshare:dump", &tail)) {
2908       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2909       set_mode_flags(_int);     // Prevent compilation, which creates objects
2910     // -Xshare:on
2911     } else if (match_option(option, "-Xshare:on", &tail)) {
2912       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2913       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2914     // -Xshare:auto
2915     } else if (match_option(option, "-Xshare:auto", &tail)) {
2916       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2917       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2918     // -Xshare:off
2919     } else if (match_option(option, "-Xshare:off", &tail)) {
2920       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2921       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2922     // -Xverify
2923     } else if (match_option(option, "-Xverify", &tail)) {
2924       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2925         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2926         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2927       } else if (strcmp(tail, ":remote") == 0) {
2928         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2929         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2930       } else if (strcmp(tail, ":none") == 0) {
2931         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2932         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2933       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2934         return JNI_EINVAL;
2935       }
2936     // -Xdebug
2937     } else if (match_option(option, "-Xdebug", &tail)) {
2938       // note this flag has been used, then ignore
2939       set_xdebug_mode(true);
2940     // -Xnoagent
2941     } else if (match_option(option, "-Xnoagent", &tail)) {
2942       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2943     } else if (match_option(option, "-Xboundthreads", &tail)) {
2944       // Bind user level threads to kernel threads (Solaris only)
2945       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2946     } else if (match_option(option, "-Xloggc:", &tail)) {
2947       // Redirect GC output to the file. -Xloggc:<filename>
2948       // ostream_init_log(), when called will use this filename
2949       // to initialize a fileStream.
2950       _gc_log_filename = strdup(tail);
2951      if (!is_filename_valid(_gc_log_filename)) {
2952        jio_fprintf(defaultStream::output_stream(),
2953                   "Invalid file name for use with -Xloggc: Filename can only contain the "
2954                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2955                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
2956         return JNI_EINVAL;
2957       }
2958       FLAG_SET_CMDLINE(bool, PrintGC, true);
2959       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2960 
2961     // JNI hooks
2962     } else if (match_option(option, "-Xcheck", &tail)) {
2963       if (!strcmp(tail, ":jni")) {
2964 #if !INCLUDE_JNI_CHECK
2965         warning("JNI CHECKING is not supported in this VM");
2966 #else
2967         CheckJNICalls = true;
2968 #endif // INCLUDE_JNI_CHECK
2969       } else if (is_bad_option(option, args->ignoreUnrecognized,
2970                                      "check")) {
2971         return JNI_EINVAL;
2972       }
2973     } else if (match_option(option, "vfprintf", &tail)) {
2974       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2975     } else if (match_option(option, "exit", &tail)) {
2976       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2977     } else if (match_option(option, "abort", &tail)) {
2978       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2979     // -XX:+AggressiveHeap
2980     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2981 
2982       // This option inspects the machine and attempts to set various
2983       // parameters to be optimal for long-running, memory allocation
2984       // intensive jobs.  It is intended for machines with large
2985       // amounts of cpu and memory.
2986 
2987       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2988       // VM, but we may not be able to represent the total physical memory
2989       // available (like having 8gb of memory on a box but using a 32bit VM).
2990       // Thus, we need to make sure we're using a julong for intermediate
2991       // calculations.
2992       julong initHeapSize;
2993       julong total_memory = os::physical_memory();
2994 
2995       if (total_memory < (julong)256*M) {
2996         jio_fprintf(defaultStream::error_stream(),
2997                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2998         vm_exit(1);
2999       }
3000 
3001       // The heap size is half of available memory, or (at most)
3002       // all of possible memory less 160mb (leaving room for the OS
3003       // when using ISM).  This is the maximum; because adaptive sizing
3004       // is turned on below, the actual space used may be smaller.
3005 
3006       initHeapSize = MIN2(total_memory / (julong)2,
3007                           total_memory - (julong)160*M);
3008 
3009       initHeapSize = limit_by_allocatable_memory(initHeapSize);
3010 
3011       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3012          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3013          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3014          // Currently the minimum size and the initial heap sizes are the same.
3015          set_min_heap_size(initHeapSize);
3016       }
3017       if (FLAG_IS_DEFAULT(NewSize)) {
3018          // Make the young generation 3/8ths of the total heap.
3019          FLAG_SET_CMDLINE(uintx, NewSize,
3020                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3021          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3022       }
3023 
3024 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3025       FLAG_SET_DEFAULT(UseLargePages, true);
3026 #endif
3027 
3028       // Increase some data structure sizes for efficiency
3029       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3030       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3031       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3032 
3033       // See the OldPLABSize comment below, but replace 'after promotion'
3034       // with 'after copying'.  YoungPLABSize is the size of the survivor
3035       // space per-gc-thread buffers.  The default is 4kw.
3036       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
3037 
3038       // OldPLABSize is the size of the buffers in the old gen that
3039       // UseParallelGC uses to promote live data that doesn't fit in the
3040       // survivor spaces.  At any given time, there's one for each gc thread.
3041       // The default size is 1kw. These buffers are rarely used, since the
3042       // survivor spaces are usually big enough.  For specjbb, however, there
3043       // are occasions when there's lots of live data in the young gen
3044       // and we end up promoting some of it.  We don't have a definite
3045       // explanation for why bumping OldPLABSize helps, but the theory
3046       // is that a bigger PLAB results in retaining something like the
3047       // original allocation order after promotion, which improves mutator
3048       // locality.  A minor effect may be that larger PLABs reduce the
3049       // number of PLAB allocation events during gc.  The value of 8kw
3050       // was arrived at by experimenting with specjbb.
3051       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
3052 
3053       // Enable parallel GC and adaptive generation sizing
3054       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3055       FLAG_SET_DEFAULT(ParallelGCThreads,
3056                        Abstract_VM_Version::parallel_worker_threads());
3057 
3058       // Encourage steady state memory management
3059       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3060 
3061       // This appears to improve mutator locality
3062       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3063 
3064       // Get around early Solaris scheduling bug
3065       // (affinity vs other jobs on system)
3066       // but disallow DR and offlining (5008695).
3067       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3068 
3069     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3070       // The last option must always win.
3071       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3072       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3073     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3074       // The last option must always win.
3075       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3076       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3077     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3078                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3079       jio_fprintf(defaultStream::error_stream(),
3080         "Please use CMSClassUnloadingEnabled in place of "
3081         "CMSPermGenSweepingEnabled in the future\n");
3082     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3083       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3084       jio_fprintf(defaultStream::error_stream(),
3085         "Please use -XX:+UseGCOverheadLimit in place of "
3086         "-XX:+UseGCTimeLimit in the future\n");
3087     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3088       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3089       jio_fprintf(defaultStream::error_stream(),
3090         "Please use -XX:-UseGCOverheadLimit in place of "
3091         "-XX:-UseGCTimeLimit in the future\n");
3092     // The TLE options are for compatibility with 1.3 and will be
3093     // removed without notice in a future release.  These options
3094     // are not to be documented.
3095     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3096       // No longer used.
3097     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3098       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3099     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3100       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3101     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3102       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3103     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3104       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3105     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3106       // No longer used.
3107     } else if (match_option(option, "-XX:TLESize=", &tail)) {
3108       julong long_tlab_size = 0;
3109       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3110       if (errcode != arg_in_range) {
3111         jio_fprintf(defaultStream::error_stream(),
3112                     "Invalid TLAB size: %s\n", option->optionString);
3113         describe_range_error(errcode);
3114         return JNI_EINVAL;
3115       }
3116       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3117     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3118       // No longer used.
3119     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3120       FLAG_SET_CMDLINE(bool, UseTLAB, true);
3121     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3122       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3123     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3124       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3125       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3126     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3127       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3128       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3129     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3130 #if defined(DTRACE_ENABLED)
3131       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3132       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3133       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3134       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3135 #else // defined(DTRACE_ENABLED)
3136       jio_fprintf(defaultStream::error_stream(),
3137                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3138       return JNI_EINVAL;
3139 #endif // defined(DTRACE_ENABLED)
3140 #ifdef ASSERT
3141     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3142       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3143       // disable scavenge before parallel mark-compact
3144       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3145 #endif
3146     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3147       julong cms_blocks_to_claim = (julong)atol(tail);
3148       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3149       jio_fprintf(defaultStream::error_stream(),
3150         "Please use -XX:OldPLABSize in place of "
3151         "-XX:CMSParPromoteBlocksToClaim in the future\n");
3152     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3153       julong cms_blocks_to_claim = (julong)atol(tail);
3154       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3155       jio_fprintf(defaultStream::error_stream(),
3156         "Please use -XX:OldPLABSize in place of "
3157         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3158     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3159       julong old_plab_size = 0;
3160       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3161       if (errcode != arg_in_range) {
3162         jio_fprintf(defaultStream::error_stream(),
3163                     "Invalid old PLAB size: %s\n", option->optionString);
3164         describe_range_error(errcode);
3165         return JNI_EINVAL;
3166       }
3167       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3168       jio_fprintf(defaultStream::error_stream(),
3169                   "Please use -XX:OldPLABSize in place of "
3170                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3171     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3172       julong young_plab_size = 0;
3173       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3174       if (errcode != arg_in_range) {
3175         jio_fprintf(defaultStream::error_stream(),
3176                     "Invalid young PLAB size: %s\n", option->optionString);
3177         describe_range_error(errcode);
3178         return JNI_EINVAL;
3179       }
3180       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3181       jio_fprintf(defaultStream::error_stream(),
3182                   "Please use -XX:YoungPLABSize in place of "
3183                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3184     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3185                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3186       julong stack_size = 0;
3187       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3188       if (errcode != arg_in_range) {
3189         jio_fprintf(defaultStream::error_stream(),
3190                     "Invalid mark stack size: %s\n", option->optionString);
3191         describe_range_error(errcode);
3192         return JNI_EINVAL;
3193       }
3194       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3195     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3196       julong max_stack_size = 0;
3197       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3198       if (errcode != arg_in_range) {
3199         jio_fprintf(defaultStream::error_stream(),
3200                     "Invalid maximum mark stack size: %s\n",
3201                     option->optionString);
3202         describe_range_error(errcode);
3203         return JNI_EINVAL;
3204       }
3205       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3206     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3207                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3208       uintx conc_threads = 0;
3209       if (!parse_uintx(tail, &conc_threads, 1)) {
3210         jio_fprintf(defaultStream::error_stream(),
3211                     "Invalid concurrent threads: %s\n", option->optionString);
3212         return JNI_EINVAL;
3213       }
3214       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3215     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3216       julong max_direct_memory_size = 0;
3217       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3218       if (errcode != arg_in_range) {
3219         jio_fprintf(defaultStream::error_stream(),
3220                     "Invalid maximum direct memory size: %s\n",
3221                     option->optionString);
3222         describe_range_error(errcode);
3223         return JNI_EINVAL;
3224       }
3225       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3226     } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3227       // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3228       //       away and will cause VM initialization failures!
3229       warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3230       FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3231 #if !INCLUDE_MANAGEMENT
3232     } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3233         jio_fprintf(defaultStream::error_stream(),
3234           "ManagementServer is not supported in this VM.\n");
3235         return JNI_ERR;
3236 #endif // INCLUDE_MANAGEMENT
3237     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3238       // Skip -XX:Flags= since that case has already been handled
3239       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3240         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3241           return JNI_EINVAL;
3242         }
3243       }
3244     // Unknown option
3245     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3246       return JNI_ERR;
3247     }
3248   }
3249 
3250   // Change the default value for flags  which have different default values
3251   // when working with older JDKs.
3252 #ifdef LINUX
3253  if (JDK_Version::current().compare_major(6) <= 0 &&
3254       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3255     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3256   }
3257 #endif // LINUX
3258   return JNI_OK;
3259 }
3260 
3261 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3262   // This must be done after all -D arguments have been processed.
3263   scp_p->expand_endorsed();
3264 
3265   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3266     // Assemble the bootclasspath elements into the final path.
3267     Arguments::set_sysclasspath(scp_p->combined_path());
3268   }
3269 
3270   // This must be done after all arguments have been processed.
3271   // java_compiler() true means set to "NONE" or empty.
3272   if (java_compiler() && !xdebug_mode()) {
3273     // For backwards compatibility, we switch to interpreted mode if
3274     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3275     // not specified.
3276     set_mode_flags(_int);
3277   }
3278   if (CompileThreshold == 0) {
3279     set_mode_flags(_int);
3280   }
3281 
3282   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3283   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3284     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3285   }
3286 
3287 #ifndef COMPILER2
3288   // Don't degrade server performance for footprint
3289   if (FLAG_IS_DEFAULT(UseLargePages) &&
3290       MaxHeapSize < LargePageHeapSizeThreshold) {
3291     // No need for large granularity pages w/small heaps.
3292     // Note that large pages are enabled/disabled for both the
3293     // Java heap and the code cache.
3294     FLAG_SET_DEFAULT(UseLargePages, false);
3295   }
3296 
3297 #else
3298   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3299     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3300   }
3301 #endif
3302 
3303 #ifndef TIERED
3304   // Tiered compilation is undefined.
3305   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3306 #endif
3307 
3308   // If we are running in a headless jre, force java.awt.headless property
3309   // to be true unless the property has already been set.
3310   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3311   if (os::is_headless_jre()) {
3312     const char* headless = Arguments::get_property("java.awt.headless");
3313     if (headless == NULL) {
3314       char envbuffer[128];
3315       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3316         if (!add_property("java.awt.headless=true")) {
3317           return JNI_ENOMEM;
3318         }
3319       } else {
3320         char buffer[256];
3321         strcpy(buffer, "java.awt.headless=");
3322         strcat(buffer, envbuffer);
3323         if (!add_property(buffer)) {
3324           return JNI_ENOMEM;
3325         }
3326       }
3327     }
3328   }
3329 
3330   if (!check_vm_args_consistency()) {
3331     return JNI_ERR;
3332   }
3333 
3334   return JNI_OK;
3335 }
3336 
3337 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3338   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3339                                             scp_assembly_required_p);
3340 }
3341 
3342 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3343   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3344                                             scp_assembly_required_p);
3345 }
3346 
3347 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3348   const int N_MAX_OPTIONS = 64;
3349   const int OPTION_BUFFER_SIZE = 1024;
3350   char buffer[OPTION_BUFFER_SIZE];
3351 
3352   // The variable will be ignored if it exceeds the length of the buffer.
3353   // Don't check this variable if user has special privileges
3354   // (e.g. unix su command).
3355   if (os::getenv(name, buffer, sizeof(buffer)) &&
3356       !os::have_special_privileges()) {
3357     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3358     jio_fprintf(defaultStream::error_stream(),
3359                 "Picked up %s: %s\n", name, buffer);
3360     char* rd = buffer;                        // pointer to the input string (rd)
3361     int i;
3362     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3363       while (isspace(*rd)) rd++;              // skip whitespace
3364       if (*rd == 0) break;                    // we re done when the input string is read completely
3365 
3366       // The output, option string, overwrites the input string.
3367       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3368       // input string (rd).
3369       char* wrt = rd;
3370 
3371       options[i++].optionString = wrt;        // Fill in option
3372       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3373         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3374           int quote = *rd;                    // matching quote to look for
3375           rd++;                               // don't copy open quote
3376           while (*rd != quote) {              // include everything (even spaces) up until quote
3377             if (*rd == 0) {                   // string termination means unmatched string
3378               jio_fprintf(defaultStream::error_stream(),
3379                           "Unmatched quote in %s\n", name);
3380               return JNI_ERR;
3381             }
3382             *wrt++ = *rd++;                   // copy to option string
3383           }
3384           rd++;                               // don't copy close quote
3385         } else {
3386           *wrt++ = *rd++;                     // copy to option string
3387         }
3388       }
3389       // Need to check if we're done before writing a NULL,
3390       // because the write could be to the byte that rd is pointing to.
3391       if (*rd++ == 0) {
3392         *wrt = 0;
3393         break;
3394       }
3395       *wrt = 0;                               // Zero terminate option
3396     }
3397     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3398     JavaVMInitArgs vm_args;
3399     vm_args.version = JNI_VERSION_1_2;
3400     vm_args.options = options;
3401     vm_args.nOptions = i;
3402     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3403 
3404     if (PrintVMOptions) {
3405       const char* tail;
3406       for (int i = 0; i < vm_args.nOptions; i++) {
3407         const JavaVMOption *option = vm_args.options + i;
3408         if (match_option(option, "-XX:", &tail)) {
3409           logOption(tail);
3410         }
3411       }
3412     }
3413 
3414     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3415   }
3416   return JNI_OK;
3417 }
3418 
3419 void Arguments::set_shared_spaces_flags() {
3420   if (DumpSharedSpaces) {
3421     if (RequireSharedSpaces) {
3422       warning("cannot dump shared archive while using shared archive");
3423     }
3424     UseSharedSpaces = false;
3425 #ifdef _LP64
3426     if (!UseCompressedOops || !UseCompressedClassPointers) {
3427       vm_exit_during_initialization(
3428         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3429     }
3430   } else {
3431     // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3432     if (!UseCompressedOops || !UseCompressedClassPointers) {
3433       no_shared_spaces();
3434     }
3435 #endif
3436   }
3437 }
3438 
3439 #if !INCLUDE_ALL_GCS
3440 static void force_serial_gc() {
3441   FLAG_SET_DEFAULT(UseSerialGC, true);
3442   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
3443   UNSUPPORTED_GC_OPTION(UseG1GC);
3444   UNSUPPORTED_GC_OPTION(UseParallelGC);
3445   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3446   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3447   UNSUPPORTED_GC_OPTION(UseParNewGC);
3448 }
3449 #endif // INCLUDE_ALL_GCS
3450 
3451 // Sharing support
3452 // Construct the path to the archive
3453 static char* get_shared_archive_path() {
3454   char *shared_archive_path;
3455   if (SharedArchiveFile == NULL) {
3456     char jvm_path[JVM_MAXPATHLEN];
3457     os::jvm_path(jvm_path, sizeof(jvm_path));
3458     char *end = strrchr(jvm_path, *os::file_separator());
3459     if (end != NULL) *end = '\0';
3460     size_t jvm_path_len = strlen(jvm_path);
3461     size_t file_sep_len = strlen(os::file_separator());
3462     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3463         file_sep_len + 20, mtInternal);
3464     if (shared_archive_path != NULL) {
3465       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3466       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3467       strncat(shared_archive_path, "classes.jsa", 11);
3468     }
3469   } else {
3470     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3471     if (shared_archive_path != NULL) {
3472       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3473     }
3474   }
3475   return shared_archive_path;
3476 }
3477 
3478 #ifndef PRODUCT
3479 // Determine whether LogVMOutput should be implicitly turned on.
3480 static bool use_vm_log() {
3481   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3482       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3483       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3484       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3485       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3486     return true;
3487   }
3488 
3489 #ifdef COMPILER1
3490   if (PrintC1Statistics) {
3491     return true;
3492   }
3493 #endif // COMPILER1
3494 
3495 #ifdef COMPILER2
3496   if (PrintOptoAssembly || PrintOptoStatistics) {
3497     return true;
3498   }
3499 #endif // COMPILER2
3500 
3501   return false;
3502 }
3503 #endif // PRODUCT
3504 
3505 // Parse entry point called from JNI_CreateJavaVM
3506 
3507 jint Arguments::parse(const JavaVMInitArgs* args) {
3508 
3509   // Remaining part of option string
3510   const char* tail;
3511 
3512   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3513   const char* hotspotrc = ".hotspotrc";
3514   bool settings_file_specified = false;
3515   bool needs_hotspotrc_warning = false;
3516 
3517   const char* flags_file;
3518   int index;
3519   for (index = 0; index < args->nOptions; index++) {
3520     const JavaVMOption *option = args->options + index;
3521     if (match_option(option, "-XX:Flags=", &tail)) {
3522       flags_file = tail;
3523       settings_file_specified = true;
3524     }
3525     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3526       PrintVMOptions = true;
3527     }
3528     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3529       PrintVMOptions = false;
3530     }
3531     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3532       IgnoreUnrecognizedVMOptions = true;
3533     }
3534     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3535       IgnoreUnrecognizedVMOptions = false;
3536     }
3537     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3538       CommandLineFlags::printFlags(tty, false);
3539       vm_exit(0);
3540     }
3541     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3542 #if INCLUDE_NMT
3543       MemTracker::init_tracking_options(tail);
3544 #else
3545       jio_fprintf(defaultStream::error_stream(),
3546         "Native Memory Tracking is not supported in this VM\n");
3547       return JNI_ERR;
3548 #endif
3549     }
3550 
3551 
3552 #ifndef PRODUCT
3553     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3554       CommandLineFlags::printFlags(tty, true);
3555       vm_exit(0);
3556     }
3557 #endif
3558   }
3559 
3560   if (IgnoreUnrecognizedVMOptions) {
3561     // uncast const to modify the flag args->ignoreUnrecognized
3562     *(jboolean*)(&args->ignoreUnrecognized) = true;
3563   }
3564 
3565   // Parse specified settings file
3566   if (settings_file_specified) {
3567     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3568       return JNI_EINVAL;
3569     }
3570   } else {
3571 #ifdef ASSERT
3572     // Parse default .hotspotrc settings file
3573     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3574       return JNI_EINVAL;
3575     }
3576 #else
3577     struct stat buf;
3578     if (os::stat(hotspotrc, &buf) == 0) {
3579       needs_hotspotrc_warning = true;
3580     }
3581 #endif
3582   }
3583 
3584   if (PrintVMOptions) {
3585     for (index = 0; index < args->nOptions; index++) {
3586       const JavaVMOption *option = args->options + index;
3587       if (match_option(option, "-XX:", &tail)) {
3588         logOption(tail);
3589       }
3590     }
3591   }
3592 
3593   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3594   jint result = parse_vm_init_args(args);
3595   if (result != JNI_OK) {
3596     return result;
3597   }
3598 
3599   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3600   SharedArchivePath = get_shared_archive_path();
3601   if (SharedArchivePath == NULL) {
3602     return JNI_ENOMEM;
3603   }
3604 
3605   // Delay warning until here so that we've had a chance to process
3606   // the -XX:-PrintWarnings flag
3607   if (needs_hotspotrc_warning) {
3608     warning("%s file is present but has been ignored.  "
3609             "Run with -XX:Flags=%s to load the file.",
3610             hotspotrc, hotspotrc);
3611   }
3612 
3613 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3614   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3615 #endif
3616 
3617 #if INCLUDE_ALL_GCS
3618   #if (defined JAVASE_EMBEDDED || defined ARM)
3619     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3620   #endif
3621 #endif
3622 
3623 #ifndef PRODUCT
3624   if (TraceBytecodesAt != 0) {
3625     TraceBytecodes = true;
3626   }
3627   if (CountCompiledCalls) {
3628     if (UseCounterDecay) {
3629       warning("UseCounterDecay disabled because CountCalls is set");
3630       UseCounterDecay = false;
3631     }
3632   }
3633 #endif // PRODUCT
3634 
3635   // JSR 292 is not supported before 1.7
3636   if (!JDK_Version::is_gte_jdk17x_version()) {
3637     if (EnableInvokeDynamic) {
3638       if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3639         warning("JSR 292 is not supported before 1.7.  Disabling support.");
3640       }
3641       EnableInvokeDynamic = false;
3642     }
3643   }
3644 
3645   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3646     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3647       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3648     }
3649     ScavengeRootsInCode = 1;
3650   }
3651 
3652   if (PrintGCDetails) {
3653     // Turn on -verbose:gc options as well
3654     PrintGC = true;
3655   }
3656 
3657   if (!JDK_Version::is_gte_jdk18x_version()) {
3658     // To avoid changing the log format for 7 updates this flag is only
3659     // true by default in JDK8 and above.
3660     if (FLAG_IS_DEFAULT(PrintGCCause)) {
3661       FLAG_SET_DEFAULT(PrintGCCause, false);
3662     }
3663   }
3664 
3665   // Set object alignment values.
3666   set_object_alignment();
3667 
3668 #if !INCLUDE_ALL_GCS
3669   force_serial_gc();
3670 #endif // INCLUDE_ALL_GCS
3671 #if !INCLUDE_CDS
3672   if (DumpSharedSpaces || RequireSharedSpaces) {
3673     jio_fprintf(defaultStream::error_stream(),
3674       "Shared spaces are not supported in this VM\n");
3675     return JNI_ERR;
3676   }
3677   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3678     warning("Shared spaces are not supported in this VM");
3679     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3680     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3681   }
3682   no_shared_spaces();
3683 #endif // INCLUDE_CDS
3684 
3685   return JNI_OK;
3686 }
3687 
3688 jint Arguments::apply_ergo() {
3689 
3690   // Set flags based on ergonomics.
3691   set_ergonomics_flags();
3692 
3693   set_shared_spaces_flags();
3694 
3695   // Check the GC selections again.
3696   if (!check_gc_consistency()) {
3697     return JNI_EINVAL;
3698   }
3699 
3700   if (TieredCompilation) {
3701     set_tiered_flags();
3702   } else {
3703     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3704     if (CompilationPolicyChoice >= 2) {
3705       vm_exit_during_initialization(
3706         "Incompatible compilation policy selected", NULL);
3707     }
3708   }
3709   // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3710   if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3711     FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3712   }
3713 
3714 
3715   // Set heap size based on available physical memory
3716   set_heap_size();
3717 
3718 #if INCLUDE_ALL_GCS
3719   // Set per-collector flags
3720   if (UseParallelGC || UseParallelOldGC) {
3721     set_parallel_gc_flags();
3722   } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3723     set_cms_and_parnew_gc_flags();
3724   } else if (UseParNewGC) {  // Skipped if CMS is set above
3725     set_parnew_gc_flags();
3726   } else if (UseG1GC) {
3727     set_g1_gc_flags();
3728   }
3729   check_deprecated_gcs();
3730   check_deprecated_gc_flags();
3731   if (AssumeMP && !UseSerialGC) {
3732     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3733       warning("If the number of processors is expected to increase from one, then"
3734               " you should configure the number of parallel GC threads appropriately"
3735               " using -XX:ParallelGCThreads=N");
3736     }
3737   }
3738   if (MinHeapFreeRatio == 100) {
3739     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3740     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3741   }
3742 #else // INCLUDE_ALL_GCS
3743   assert(verify_serial_gc_flags(), "SerialGC unset");
3744 #endif // INCLUDE_ALL_GCS
3745 
3746   // Initialize Metaspace flags and alignments
3747   Metaspace::ergo_initialize();
3748 
3749   // Set bytecode rewriting flags
3750   set_bytecode_flags();
3751 
3752   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3753   set_aggressive_opts_flags();
3754 
3755   // Turn off biased locking for locking debug mode flags,
3756   // which are subtly different from each other but neither works with
3757   // biased locking
3758   if (UseHeavyMonitors
3759 #ifdef COMPILER1
3760       || !UseFastLocking
3761 #endif // COMPILER1
3762     ) {
3763     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3764       // flag set to true on command line; warn the user that they
3765       // can't enable biased locking here
3766       warning("Biased Locking is not supported with locking debug flags"
3767               "; ignoring UseBiasedLocking flag." );
3768     }
3769     UseBiasedLocking = false;
3770   }
3771 
3772 #ifdef ZERO
3773   // Clear flags not supported on zero.
3774   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3775   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3776   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3777   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3778 #endif // CC_INTERP
3779 
3780 #ifdef COMPILER2
3781   if (!UseBiasedLocking || EmitSync != 0) {
3782     UseOptoBiasInlining = false;
3783   }
3784   if (!EliminateLocks) {
3785     EliminateNestedLocks = false;
3786   }
3787   if (!Inline) {
3788     IncrementalInline = false;
3789   }
3790 #ifndef PRODUCT
3791   if (!IncrementalInline) {
3792     AlwaysIncrementalInline = false;
3793   }
3794 #endif
3795   if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3796     // incremental inlining: bump MaxNodeLimit
3797     FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3798   }
3799   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3800     // nothing to use the profiling, turn if off
3801     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3802   }
3803   if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3804     // Doing the replace in parent maps helps speculation
3805     FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3806   }
3807 #endif
3808 
3809   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3810     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3811     DebugNonSafepoints = true;
3812   }
3813 
3814   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3815     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3816   }
3817 
3818 #ifndef PRODUCT
3819   if (CompileTheWorld) {
3820     // Force NmethodSweeper to sweep whole CodeCache each time.
3821     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3822       NmethodSweepFraction = 1;
3823     }
3824   }
3825 
3826   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3827     if (use_vm_log()) {
3828       LogVMOutput = true;
3829     }
3830   }
3831 #endif // PRODUCT
3832 
3833   if (PrintCommandLineFlags) {
3834     CommandLineFlags::printSetFlags(tty);
3835   }
3836 
3837   // Apply CPU specific policy for the BiasedLocking
3838   if (UseBiasedLocking) {
3839     if (!VM_Version::use_biased_locking() &&
3840         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3841       UseBiasedLocking = false;
3842     }
3843   }
3844 
3845   return JNI_OK;
3846 }
3847 
3848 jint Arguments::adjust_after_os() {
3849   if (UseNUMA) {
3850     if (UseParallelGC || UseParallelOldGC) {
3851       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3852          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3853       }
3854     }
3855     // UseNUMAInterleaving is set to ON for all collectors and
3856     // platforms when UseNUMA is set to ON. NUMA-aware collectors
3857     // such as the parallel collector for Linux and Solaris will
3858     // interleave old gen and survivor spaces on top of NUMA
3859     // allocation policy for the eden space.
3860     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3861     // all platforms and ParallelGC on Windows will interleave all
3862     // of the heap spaces across NUMA nodes.
3863     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3864       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3865     }
3866   }
3867   return JNI_OK;
3868 }
3869 
3870 int Arguments::PropertyList_count(SystemProperty* pl) {
3871   int count = 0;
3872   while(pl != NULL) {
3873     count++;
3874     pl = pl->next();
3875   }
3876   return count;
3877 }
3878 
3879 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3880   assert(key != NULL, "just checking");
3881   SystemProperty* prop;
3882   for (prop = pl; prop != NULL; prop = prop->next()) {
3883     if (strcmp(key, prop->key()) == 0) return prop->value();
3884   }
3885   return NULL;
3886 }
3887 
3888 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3889   int count = 0;
3890   const char* ret_val = NULL;
3891 
3892   while(pl != NULL) {
3893     if(count >= index) {
3894       ret_val = pl->key();
3895       break;
3896     }
3897     count++;
3898     pl = pl->next();
3899   }
3900 
3901   return ret_val;
3902 }
3903 
3904 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3905   int count = 0;
3906   char* ret_val = NULL;
3907 
3908   while(pl != NULL) {
3909     if(count >= index) {
3910       ret_val = pl->value();
3911       break;
3912     }
3913     count++;
3914     pl = pl->next();
3915   }
3916 
3917   return ret_val;
3918 }
3919 
3920 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3921   SystemProperty* p = *plist;
3922   if (p == NULL) {
3923     *plist = new_p;
3924   } else {
3925     while (p->next() != NULL) {
3926       p = p->next();
3927     }
3928     p->set_next(new_p);
3929   }
3930 }
3931 
3932 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3933   if (plist == NULL)
3934     return;
3935 
3936   SystemProperty* new_p = new SystemProperty(k, v, true);
3937   PropertyList_add(plist, new_p);
3938 }
3939 
3940 // This add maintains unique property key in the list.
3941 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3942   if (plist == NULL)
3943     return;
3944 
3945   // If property key exist then update with new value.
3946   SystemProperty* prop;
3947   for (prop = *plist; prop != NULL; prop = prop->next()) {
3948     if (strcmp(k, prop->key()) == 0) {
3949       if (append) {
3950         prop->append_value(v);
3951       } else {
3952         prop->set_value(v);
3953       }
3954       return;
3955     }
3956   }
3957 
3958   PropertyList_add(plist, k, v);
3959 }
3960 
3961 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3962 // Returns true if all of the source pointed by src has been copied over to
3963 // the destination buffer pointed by buf. Otherwise, returns false.
3964 // Notes:
3965 // 1. If the length (buflen) of the destination buffer excluding the
3966 // NULL terminator character is not long enough for holding the expanded
3967 // pid characters, it also returns false instead of returning the partially
3968 // expanded one.
3969 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3970 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3971                                 char* buf, size_t buflen) {
3972   const char* p = src;
3973   char* b = buf;
3974   const char* src_end = &src[srclen];
3975   char* buf_end = &buf[buflen - 1];
3976 
3977   while (p < src_end && b < buf_end) {
3978     if (*p == '%') {
3979       switch (*(++p)) {
3980       case '%':         // "%%" ==> "%"
3981         *b++ = *p++;
3982         break;
3983       case 'p':  {       //  "%p" ==> current process id
3984         // buf_end points to the character before the last character so
3985         // that we could write '\0' to the end of the buffer.
3986         size_t buf_sz = buf_end - b + 1;
3987         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3988 
3989         // if jio_snprintf fails or the buffer is not long enough to hold
3990         // the expanded pid, returns false.
3991         if (ret < 0 || ret >= (int)buf_sz) {
3992           return false;
3993         } else {
3994           b += ret;
3995           assert(*b == '\0', "fail in copy_expand_pid");
3996           if (p == src_end && b == buf_end + 1) {
3997             // reach the end of the buffer.
3998             return true;
3999           }
4000         }
4001         p++;
4002         break;
4003       }
4004       default :
4005         *b++ = '%';
4006       }
4007     } else {
4008       *b++ = *p++;
4009     }
4010   }
4011   *b = '\0';
4012   return (p == src_end); // return false if not all of the source was copied
4013 }