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/classLoader.hpp"
  27 #include "classfile/javaAssertions.hpp"
  28 #include "classfile/stringTable.hpp"
  29 #include "classfile/symbolTable.hpp"
  30 #include "compiler/compilerOracle.hpp"
  31 #include "memory/allocation.inline.hpp"
  32 #include "memory/cardTableRS.hpp"
  33 #include "memory/genCollectedHeap.hpp"
  34 #include "memory/referenceProcessor.hpp"
  35 #include "memory/universe.inline.hpp"
  36 #include "oops/oop.inline.hpp"
  37 #include "prims/jvmtiExport.hpp"
  38 #include "runtime/arguments.hpp"
  39 #include "runtime/arguments_ext.hpp"
  40 #include "runtime/globals_extension.hpp"
  41 #include "runtime/java.hpp"
  42 #include "runtime/os.hpp"
  43 #include "runtime/vm_version.hpp"
  44 #include "services/management.hpp"
  45 #include "services/memTracker.hpp"
  46 #include "utilities/defaultStream.hpp"
  47 #include "utilities/macros.hpp"
  48 #include "utilities/stringUtils.hpp"
  49 #include "utilities/taskqueue.hpp"
  50 #if INCLUDE_ALL_GCS
  51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  54 #endif // INCLUDE_ALL_GCS
  55 
  56 // Note: This is a special bug reporting site for the JVM
  57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
  58 #define DEFAULT_JAVA_LAUNCHER  "generic"
  59 
  60 // Disable options not supported in this release, with a warning if they
  61 // were explicitly requested on the command-line
  62 #define UNSUPPORTED_OPTION(opt, description)                    \
  63 do {                                                            \
  64   if (opt) {                                                    \
  65     if (FLAG_IS_CMDLINE(opt)) {                                 \
  66       warning(description " is disabled in this release.");     \
  67     }                                                           \
  68     FLAG_SET_DEFAULT(opt, false);                               \
  69   }                                                             \
  70 } while(0)
  71 
  72 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  73 do {                                                                  \
  74   if (gc) {                                                           \
  75     if (FLAG_IS_CMDLINE(gc)) {                                        \
  76       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  77     }                                                                 \
  78     FLAG_SET_DEFAULT(gc, false);                                      \
  79   }                                                                   \
  80 } while(0)
  81 
  82 char**  Arguments::_jvm_flags_array             = NULL;
  83 int     Arguments::_num_jvm_flags               = 0;
  84 char**  Arguments::_jvm_args_array              = NULL;
  85 int     Arguments::_num_jvm_args                = 0;
  86 char*  Arguments::_java_command                 = NULL;
  87 SystemProperty* Arguments::_system_properties   = NULL;
  88 const char*  Arguments::_gc_log_filename        = NULL;
  89 bool   Arguments::_has_profile                  = false;
  90 size_t Arguments::_conservative_max_heap_alignment = 0;
  91 uintx  Arguments::_min_heap_size                = 0;
  92 uintx  Arguments::_min_heap_free_ratio          = 0;
  93 uintx  Arguments::_max_heap_free_ratio          = 0;
  94 Arguments::Mode Arguments::_mode                = _mixed;
  95 bool   Arguments::_java_compiler                = false;
  96 bool   Arguments::_xdebug_mode                  = false;
  97 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  98 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  99 int    Arguments::_sun_java_launcher_pid        = -1;
 100 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
 101 
 102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
 103 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 104 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 105 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 106 bool   Arguments::_ClipInlining                 = ClipInlining;
 107 
 108 char*  Arguments::SharedArchivePath             = NULL;
 109 
 110 AgentLibraryList Arguments::_libraryList;
 111 AgentLibraryList Arguments::_agentList;
 112 
 113 abort_hook_t     Arguments::_abort_hook         = NULL;
 114 exit_hook_t      Arguments::_exit_hook          = NULL;
 115 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 116 
 117 
 118 SystemProperty *Arguments::_java_ext_dirs = NULL;
 119 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
 120 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 121 SystemProperty *Arguments::_java_library_path = NULL;
 122 SystemProperty *Arguments::_java_home = NULL;
 123 SystemProperty *Arguments::_java_class_path = NULL;
 124 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 125 
 126 char* Arguments::_meta_index_path = NULL;
 127 char* Arguments::_meta_index_dir = NULL;
 128 
 129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
 130 
 131 static bool match_option(const JavaVMOption *option, const char* name,
 132                          const char** tail) {
 133   int len = (int)strlen(name);
 134   if (strncmp(option->optionString, name, len) == 0) {
 135     *tail = option->optionString + len;
 136     return true;
 137   } else {
 138     return false;
 139   }
 140 }
 141 
 142 static void logOption(const char* opt) {
 143   if (PrintVMOptions) {
 144     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 145   }
 146 }
 147 
 148 // Process java launcher properties.
 149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 150   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 151   // sun.java.launcher.pid is defined.
 152   // Must do this before setting up other system properties,
 153   // as some of them may depend on launcher type.
 154   for (int index = 0; index < args->nOptions; index++) {
 155     const JavaVMOption* option = args->options + index;
 156     const char* tail;
 157 
 158     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 159       process_java_launcher_argument(tail, option->extraInfo);
 160       continue;
 161     }
 162     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 163       if (strcmp(tail, "true") == 0) {
 164         _sun_java_launcher_is_altjvm = true;
 165       }
 166       continue;
 167     }
 168     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 169       _sun_java_launcher_pid = atoi(tail);
 170       continue;
 171     }
 172   }
 173 }
 174 
 175 // Initialize system properties key and value.
 176 void Arguments::init_system_properties() {
 177 
 178   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 179                                                                  "Java Virtual Machine Specification",  false));
 180   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 181   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 182   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 183 
 184   // Following are JVMTI agent writable properties.
 185   // Properties values are set to NULL and they are
 186   // os specific they are initialized in os::init_system_properties_values().
 187   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 188   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 189   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 190   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 191   _java_home =  new SystemProperty("java.home", NULL,  true);
 192   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 193 
 194   _java_class_path = new SystemProperty("java.class.path", "",  true);
 195 
 196   // Add to System Property list.
 197   PropertyList_add(&_system_properties, _java_ext_dirs);
 198   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 199   PropertyList_add(&_system_properties, _sun_boot_library_path);
 200   PropertyList_add(&_system_properties, _java_library_path);
 201   PropertyList_add(&_system_properties, _java_home);
 202   PropertyList_add(&_system_properties, _java_class_path);
 203   PropertyList_add(&_system_properties, _sun_boot_class_path);
 204 
 205   // Set OS specific system properties values
 206   os::init_system_properties_values();
 207 }
 208 
 209 
 210   // Update/Initialize System properties after JDK version number is known
 211 void Arguments::init_version_specific_system_properties() {
 212   enum { bufsz = 16 };
 213   char buffer[bufsz];
 214   const char* spec_vendor = "Sun Microsystems Inc.";
 215   uint32_t spec_version = 0;
 216 
 217   spec_vendor = "Oracle Corporation";
 218   spec_version = JDK_Version::current().major_version();
 219   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 220 
 221   PropertyList_add(&_system_properties,
 222       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 223   PropertyList_add(&_system_properties,
 224       new SystemProperty("java.vm.specification.version", buffer, false));
 225   PropertyList_add(&_system_properties,
 226       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 227 }
 228 
 229 /**
 230  * Provide a slightly more user-friendly way of eliminating -XX flags.
 231  * When a flag is eliminated, it can be added to this list in order to
 232  * continue accepting this flag on the command-line, while issuing a warning
 233  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 234  * limit, we flatly refuse to admit the existence of the flag.  This allows
 235  * a flag to die correctly over JDK releases using HSX.
 236  */
 237 typedef struct {
 238   const char* name;
 239   JDK_Version obsoleted_in; // when the flag went away
 240   JDK_Version accept_until; // which version to start denying the existence
 241 } ObsoleteFlag;
 242 
 243 static ObsoleteFlag obsolete_jvm_flags[] = {
 244   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 245   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 246   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 247   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 248   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 249   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 250   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 251   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 252   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 253   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 254   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 255   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 256   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 257   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 258   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 259   { "DefaultInitialRAMFraction",
 260                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 261   { "UseDepthFirstScavengeOrder",
 262                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 263   { "HandlePromotionFailure",
 264                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 265   { "MaxLiveObjectEvacuationRatio",
 266                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 267   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 268   { "UseParallelOldGCCompacting",
 269                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 270   { "UseParallelDensePrefixUpdate",
 271                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 272   { "UseParallelOldGCDensePrefix",
 273                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 274   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 275   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 276   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 277   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 278   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 279   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 280   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 281   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 282   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 283   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 284   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 285   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 286   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 287   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 288   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 289   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 290   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 291   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 292   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 293   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 294   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 295   { "SafepointPollOffset",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 296 #ifdef PRODUCT
 297   { "DesiredMethodLimit",
 298                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 299 #endif // PRODUCT
 300   { "UseVMInterruptibleIO",          JDK_Version::jdk(8), JDK_Version::jdk(9) },
 301   { "UseBoundThreads",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 302   { "DefaultThreadPriority",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 303   { "NoYieldsInMicrolock",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 304   { "BackEdgeThreshold",             JDK_Version::jdk(9), JDK_Version::jdk(10) },
 305   { "UseNewReflection",              JDK_Version::jdk(9), JDK_Version::jdk(10) },
 306   { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
 307   { "VerifyReflectionBytecodes",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 308   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 309 #ifndef ZERO
 310   { "UseFastAccessorMethods",        JDK_Version::jdk(9), JDK_Version::jdk(10) },
 311   { "UseFastEmptyMethods",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 312 #endif // ZERO
 313   { NULL, JDK_Version(0), JDK_Version(0) }
 314 };
 315 
 316 // Returns true if the flag is obsolete and fits into the range specified
 317 // for being ignored.  In the case that the flag is ignored, the 'version'
 318 // value is filled in with the version number when the flag became
 319 // obsolete so that that value can be displayed to the user.
 320 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 321   int i = 0;
 322   assert(version != NULL, "Must provide a version buffer");
 323   while (obsolete_jvm_flags[i].name != NULL) {
 324     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 325     // <flag>=xxx form
 326     // [-|+]<flag> form
 327     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 328         ((s[0] == '+' || s[0] == '-') &&
 329         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 330       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 331           *version = flag_status.obsoleted_in;
 332           return true;
 333       }
 334     }
 335     i++;
 336   }
 337   return false;
 338 }
 339 
 340 // Constructs the system class path (aka boot class path) from the following
 341 // components, in order:
 342 //
 343 //     prefix           // from -Xbootclasspath/p:...
 344 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 345 //     base             // from os::get_system_properties() or -Xbootclasspath=
 346 //     suffix           // from -Xbootclasspath/a:...
 347 //
 348 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 349 // directories are added to the sysclasspath just before the base.
 350 //
 351 // This could be AllStatic, but it isn't needed after argument processing is
 352 // complete.
 353 class SysClassPath: public StackObj {
 354 public:
 355   SysClassPath(const char* base);
 356   ~SysClassPath();
 357 
 358   inline void set_base(const char* base);
 359   inline void add_prefix(const char* prefix);
 360   inline void add_suffix_to_prefix(const char* suffix);
 361   inline void add_suffix(const char* suffix);
 362   inline void reset_path(const char* base);
 363 
 364   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 365   // property.  Must be called after all command-line arguments have been
 366   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 367   // combined_path().
 368   void expand_endorsed();
 369 
 370   inline const char* get_base()     const { return _items[_scp_base]; }
 371   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 372   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 373   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 374 
 375   // Combine all the components into a single c-heap-allocated string; caller
 376   // must free the string if/when no longer needed.
 377   char* combined_path();
 378 
 379 private:
 380   // Utility routines.
 381   static char* add_to_path(const char* path, const char* str, bool prepend);
 382   static char* add_jars_to_path(char* path, const char* directory);
 383 
 384   inline void reset_item_at(int index);
 385 
 386   // Array indices for the items that make up the sysclasspath.  All except the
 387   // base are allocated in the C heap and freed by this class.
 388   enum {
 389     _scp_prefix,        // from -Xbootclasspath/p:...
 390     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 391     _scp_base,          // the default sysclasspath
 392     _scp_suffix,        // from -Xbootclasspath/a:...
 393     _scp_nitems         // the number of items, must be last.
 394   };
 395 
 396   const char* _items[_scp_nitems];
 397   DEBUG_ONLY(bool _expansion_done;)
 398 };
 399 
 400 SysClassPath::SysClassPath(const char* base) {
 401   memset(_items, 0, sizeof(_items));
 402   _items[_scp_base] = base;
 403   DEBUG_ONLY(_expansion_done = false;)
 404 }
 405 
 406 SysClassPath::~SysClassPath() {
 407   // Free everything except the base.
 408   for (int i = 0; i < _scp_nitems; ++i) {
 409     if (i != _scp_base) reset_item_at(i);
 410   }
 411   DEBUG_ONLY(_expansion_done = false;)
 412 }
 413 
 414 inline void SysClassPath::set_base(const char* base) {
 415   _items[_scp_base] = base;
 416 }
 417 
 418 inline void SysClassPath::add_prefix(const char* prefix) {
 419   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 420 }
 421 
 422 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 423   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 424 }
 425 
 426 inline void SysClassPath::add_suffix(const char* suffix) {
 427   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 428 }
 429 
 430 inline void SysClassPath::reset_item_at(int index) {
 431   assert(index < _scp_nitems && index != _scp_base, "just checking");
 432   if (_items[index] != NULL) {
 433     FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
 434     _items[index] = NULL;
 435   }
 436 }
 437 
 438 inline void SysClassPath::reset_path(const char* base) {
 439   // Clear the prefix and suffix.
 440   reset_item_at(_scp_prefix);
 441   reset_item_at(_scp_suffix);
 442   set_base(base);
 443 }
 444 
 445 //------------------------------------------------------------------------------
 446 
 447 void SysClassPath::expand_endorsed() {
 448   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 449 
 450   const char* path = Arguments::get_property("java.endorsed.dirs");
 451   if (path == NULL) {
 452     path = Arguments::get_endorsed_dir();
 453     assert(path != NULL, "no default for java.endorsed.dirs");
 454   }
 455 
 456   char* expanded_path = NULL;
 457   const char separator = *os::path_separator();
 458   const char* const end = path + strlen(path);
 459   while (path < end) {
 460     const char* tmp_end = strchr(path, separator);
 461     if (tmp_end == NULL) {
 462       expanded_path = add_jars_to_path(expanded_path, path);
 463       path = end;
 464     } else {
 465       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
 466       memcpy(dirpath, path, tmp_end - path);
 467       dirpath[tmp_end - path] = '\0';
 468       expanded_path = add_jars_to_path(expanded_path, dirpath);
 469       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
 470       path = tmp_end + 1;
 471     }
 472   }
 473   _items[_scp_endorsed] = expanded_path;
 474   DEBUG_ONLY(_expansion_done = true;)
 475 }
 476 
 477 // Combine the bootclasspath elements, some of which may be null, into a single
 478 // c-heap-allocated string.
 479 char* SysClassPath::combined_path() {
 480   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 481   assert(_expansion_done, "must call expand_endorsed() first.");
 482 
 483   size_t lengths[_scp_nitems];
 484   size_t total_len = 0;
 485 
 486   const char separator = *os::path_separator();
 487 
 488   // Get the lengths.
 489   int i;
 490   for (i = 0; i < _scp_nitems; ++i) {
 491     if (_items[i] != NULL) {
 492       lengths[i] = strlen(_items[i]);
 493       // Include space for the separator char (or a NULL for the last item).
 494       total_len += lengths[i] + 1;
 495     }
 496   }
 497   assert(total_len > 0, "empty sysclasspath not allowed");
 498 
 499   // Copy the _items to a single string.
 500   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 501   char* cp_tmp = cp;
 502   for (i = 0; i < _scp_nitems; ++i) {
 503     if (_items[i] != NULL) {
 504       memcpy(cp_tmp, _items[i], lengths[i]);
 505       cp_tmp += lengths[i];
 506       *cp_tmp++ = separator;
 507     }
 508   }
 509   *--cp_tmp = '\0';     // Replace the extra separator.
 510   return cp;
 511 }
 512 
 513 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 514 char*
 515 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 516   char *cp;
 517 
 518   assert(str != NULL, "just checking");
 519   if (path == NULL) {
 520     size_t len = strlen(str) + 1;
 521     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 522     memcpy(cp, str, len);                       // copy the trailing null
 523   } else {
 524     const char separator = *os::path_separator();
 525     size_t old_len = strlen(path);
 526     size_t str_len = strlen(str);
 527     size_t len = old_len + str_len + 2;
 528 
 529     if (prepend) {
 530       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 531       char* cp_tmp = cp;
 532       memcpy(cp_tmp, str, str_len);
 533       cp_tmp += str_len;
 534       *cp_tmp = separator;
 535       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 536       FREE_C_HEAP_ARRAY(char, path, mtInternal);
 537     } else {
 538       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 539       char* cp_tmp = cp + old_len;
 540       *cp_tmp = separator;
 541       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 542     }
 543   }
 544   return cp;
 545 }
 546 
 547 // Scan the directory and append any jar or zip files found to path.
 548 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 549 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 550   DIR* dir = os::opendir(directory);
 551   if (dir == NULL) return path;
 552 
 553   char dir_sep[2] = { '\0', '\0' };
 554   size_t directory_len = strlen(directory);
 555   const char fileSep = *os::file_separator();
 556   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 557 
 558   /* Scan the directory for jars/zips, appending them to path. */
 559   struct dirent *entry;
 560   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 561   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 562     const char* name = entry->d_name;
 563     const char* ext = name + strlen(name) - 4;
 564     bool isJarOrZip = ext > name &&
 565       (os::file_name_strcmp(ext, ".jar") == 0 ||
 566        os::file_name_strcmp(ext, ".zip") == 0);
 567     if (isJarOrZip) {
 568       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 569       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 570       path = add_to_path(path, jarpath, false);
 571       FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
 572     }
 573   }
 574   FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
 575   os::closedir(dir);
 576   return path;
 577 }
 578 
 579 // Parses a memory size specification string.
 580 static bool atomull(const char *s, julong* result) {
 581   julong n = 0;
 582   int args_read = 0;
 583   bool is_hex = false;
 584   // Skip leading 0[xX] for hexadecimal
 585   if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
 586     s += 2;
 587     is_hex = true;
 588     args_read = sscanf(s, JULONG_FORMAT_X, &n);
 589   } else {
 590     args_read = sscanf(s, JULONG_FORMAT, &n);
 591   }
 592   if (args_read != 1) {
 593     return false;
 594   }
 595   while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
 596     s++;
 597   }
 598   // 4705540: illegal if more characters are found after the first non-digit
 599   if (strlen(s) > 1) {
 600     return false;
 601   }
 602   switch (*s) {
 603     case 'T': case 't':
 604       *result = n * G * K;
 605       // Check for overflow.
 606       if (*result/((julong)G * K) != n) return false;
 607       return true;
 608     case 'G': case 'g':
 609       *result = n * G;
 610       if (*result/G != n) return false;
 611       return true;
 612     case 'M': case 'm':
 613       *result = n * M;
 614       if (*result/M != n) return false;
 615       return true;
 616     case 'K': case 'k':
 617       *result = n * K;
 618       if (*result/K != n) return false;
 619       return true;
 620     case '\0':
 621       *result = n;
 622       return true;
 623     default:
 624       return false;
 625   }
 626 }
 627 
 628 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 629   if (size < min_size) return arg_too_small;
 630   // Check that size will fit in a size_t (only relevant on 32-bit)
 631   if (size > max_uintx) return arg_too_big;
 632   return arg_in_range;
 633 }
 634 
 635 // Describe an argument out of range error
 636 void Arguments::describe_range_error(ArgsRange errcode) {
 637   switch(errcode) {
 638   case arg_too_big:
 639     jio_fprintf(defaultStream::error_stream(),
 640                 "The specified size exceeds the maximum "
 641                 "representable size.\n");
 642     break;
 643   case arg_too_small:
 644   case arg_unreadable:
 645   case arg_in_range:
 646     // do nothing for now
 647     break;
 648   default:
 649     ShouldNotReachHere();
 650   }
 651 }
 652 
 653 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 654   return CommandLineFlags::boolAtPut(name, &value, origin);
 655 }
 656 
 657 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 658   double v;
 659   if (sscanf(value, "%lf", &v) != 1) {
 660     return false;
 661   }
 662 
 663   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 664     return true;
 665   }
 666   return false;
 667 }
 668 
 669 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 670   julong v;
 671   intx intx_v;
 672   bool is_neg = false;
 673   // Check the sign first since atomull() parses only unsigned values.
 674   if (*value == '-') {
 675     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 676       return false;
 677     }
 678     value++;
 679     is_neg = true;
 680   }
 681   if (!atomull(value, &v)) {
 682     return false;
 683   }
 684   intx_v = (intx) v;
 685   if (is_neg) {
 686     intx_v = -intx_v;
 687   }
 688   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 689     return true;
 690   }
 691   uintx uintx_v = (uintx) v;
 692   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 693     return true;
 694   }
 695   uint64_t uint64_t_v = (uint64_t) v;
 696   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 697     return true;
 698   }
 699   size_t size_t_v = (size_t) v;
 700   if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
 701     return true;
 702   }
 703   return false;
 704 }
 705 
 706 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 707   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 708   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 709   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 710   return true;
 711 }
 712 
 713 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 714   const char* old_value = "";
 715   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 716   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 717   size_t new_len = strlen(new_value);
 718   const char* value;
 719   char* free_this_too = NULL;
 720   if (old_len == 0) {
 721     value = new_value;
 722   } else if (new_len == 0) {
 723     value = old_value;
 724   } else {
 725     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 726     // each new setting adds another LINE to the switch:
 727     sprintf(buf, "%s\n%s", old_value, new_value);
 728     value = buf;
 729     free_this_too = buf;
 730   }
 731   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 732   // CommandLineFlags always returns a pointer that needs freeing.
 733   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 734   if (free_this_too != NULL) {
 735     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 736     FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
 737   }
 738   return true;
 739 }
 740 
 741 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 742 
 743   // range of acceptable characters spelled out for portability reasons
 744 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 745 #define BUFLEN 255
 746   char name[BUFLEN+1];
 747   char dummy;
 748 
 749   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 750     return set_bool_flag(name, false, origin);
 751   }
 752   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 753     return set_bool_flag(name, true, origin);
 754   }
 755 
 756   char punct;
 757   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 758     const char* value = strchr(arg, '=') + 1;
 759     Flag* flag = Flag::find_flag(name, strlen(name));
 760     if (flag != NULL && flag->is_ccstr()) {
 761       if (flag->ccstr_accumulates()) {
 762         return append_to_string_flag(name, value, origin);
 763       } else {
 764         if (value[0] == '\0') {
 765           value = NULL;
 766         }
 767         return set_string_flag(name, value, origin);
 768       }
 769     }
 770   }
 771 
 772   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 773     const char* value = strchr(arg, '=') + 1;
 774     // -XX:Foo:=xxx will reset the string flag to the given value.
 775     if (value[0] == '\0') {
 776       value = NULL;
 777     }
 778     return set_string_flag(name, value, origin);
 779   }
 780 
 781 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 782 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 783 #define        NUMBER_RANGE    "[0123456789]"
 784   char value[BUFLEN + 1];
 785   char value2[BUFLEN + 1];
 786   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 787     // Looks like a floating-point number -- try again with more lenient format string
 788     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 789       return set_fp_numeric_flag(name, value, origin);
 790     }
 791   }
 792 
 793 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 794   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 795     return set_numeric_flag(name, value, origin);
 796   }
 797 
 798   return false;
 799 }
 800 
 801 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 802   assert(bldarray != NULL, "illegal argument");
 803 
 804   if (arg == NULL) {
 805     return;
 806   }
 807 
 808   int new_count = *count + 1;
 809 
 810   // expand the array and add arg to the last element
 811   if (*bldarray == NULL) {
 812     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 813   } else {
 814     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 815   }
 816   (*bldarray)[*count] = os::strdup_check_oom(arg);
 817   *count = new_count;
 818 }
 819 
 820 void Arguments::build_jvm_args(const char* arg) {
 821   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 822 }
 823 
 824 void Arguments::build_jvm_flags(const char* arg) {
 825   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 826 }
 827 
 828 // utility function to return a string that concatenates all
 829 // strings in a given char** array
 830 const char* Arguments::build_resource_string(char** args, int count) {
 831   if (args == NULL || count == 0) {
 832     return NULL;
 833   }
 834   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 835   for (int i = 1; i < count; i++) {
 836     length += strlen(args[i]) + 1; // add 1 for a space
 837   }
 838   char* s = NEW_RESOURCE_ARRAY(char, length);
 839   strcpy(s, args[0]);
 840   for (int j = 1; j < count; j++) {
 841     strcat(s, " ");
 842     strcat(s, args[j]);
 843   }
 844   return (const char*) s;
 845 }
 846 
 847 void Arguments::print_on(outputStream* st) {
 848   st->print_cr("VM Arguments:");
 849   if (num_jvm_flags() > 0) {
 850     st->print("jvm_flags: "); print_jvm_flags_on(st);
 851   }
 852   if (num_jvm_args() > 0) {
 853     st->print("jvm_args: "); print_jvm_args_on(st);
 854   }
 855   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 856   if (_java_class_path != NULL) {
 857     char* path = _java_class_path->value();
 858     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 859   }
 860   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 861 }
 862 
 863 void Arguments::print_jvm_flags_on(outputStream* st) {
 864   if (_num_jvm_flags > 0) {
 865     for (int i=0; i < _num_jvm_flags; i++) {
 866       st->print("%s ", _jvm_flags_array[i]);
 867     }
 868     st->cr();
 869   }
 870 }
 871 
 872 void Arguments::print_jvm_args_on(outputStream* st) {
 873   if (_num_jvm_args > 0) {
 874     for (int i=0; i < _num_jvm_args; i++) {
 875       st->print("%s ", _jvm_args_array[i]);
 876     }
 877     st->cr();
 878   }
 879 }
 880 
 881 bool Arguments::process_argument(const char* arg,
 882     jboolean ignore_unrecognized, Flag::Flags origin) {
 883 
 884   JDK_Version since = JDK_Version();
 885 
 886   if (parse_argument(arg, origin) || ignore_unrecognized) {
 887     return true;
 888   }
 889 
 890   bool has_plus_minus = (*arg == '+' || *arg == '-');
 891   const char* const argname = has_plus_minus ? arg + 1 : arg;
 892   if (is_newly_obsolete(arg, &since)) {
 893     char version[256];
 894     since.to_string(version, sizeof(version));
 895     warning("ignoring option %s; support was removed in %s", argname, version);
 896     return true;
 897   }
 898 
 899   // For locked flags, report a custom error message if available.
 900   // Otherwise, report the standard unrecognized VM option.
 901 
 902   size_t arg_len;
 903   const char* equal_sign = strchr(argname, '=');
 904   if (equal_sign == NULL) {
 905     arg_len = strlen(argname);
 906   } else {
 907     arg_len = equal_sign - argname;
 908   }
 909 
 910   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 911   if (found_flag != NULL) {
 912     char locked_message_buf[BUFLEN];
 913     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 914     if (strlen(locked_message_buf) == 0) {
 915       if (found_flag->is_bool() && !has_plus_minus) {
 916         jio_fprintf(defaultStream::error_stream(),
 917           "Missing +/- setting for VM option '%s'\n", argname);
 918       } else if (!found_flag->is_bool() && has_plus_minus) {
 919         jio_fprintf(defaultStream::error_stream(),
 920           "Unexpected +/- setting in VM option '%s'\n", argname);
 921       } else {
 922         jio_fprintf(defaultStream::error_stream(),
 923           "Improperly specified VM option '%s'\n", argname);
 924       }
 925     } else {
 926       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 927     }
 928   } else {
 929     jio_fprintf(defaultStream::error_stream(),
 930                 "Unrecognized VM option '%s'\n", argname);
 931     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 932     if (fuzzy_matched != NULL) {
 933       jio_fprintf(defaultStream::error_stream(),
 934                   "Did you mean '%s%s%s'?\n",
 935                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 936                   fuzzy_matched->_name,
 937                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 938     }
 939   }
 940 
 941   // allow for commandline "commenting out" options like -XX:#+Verbose
 942   return arg[0] == '#';
 943 }
 944 
 945 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 946   FILE* stream = fopen(file_name, "rb");
 947   if (stream == NULL) {
 948     if (should_exist) {
 949       jio_fprintf(defaultStream::error_stream(),
 950                   "Could not open settings file %s\n", file_name);
 951       return false;
 952     } else {
 953       return true;
 954     }
 955   }
 956 
 957   char token[1024];
 958   int  pos = 0;
 959 
 960   bool in_white_space = true;
 961   bool in_comment     = false;
 962   bool in_quote       = false;
 963   char quote_c        = 0;
 964   bool result         = true;
 965 
 966   int c = getc(stream);
 967   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 968     if (in_white_space) {
 969       if (in_comment) {
 970         if (c == '\n') in_comment = false;
 971       } else {
 972         if (c == '#') in_comment = true;
 973         else if (!isspace(c)) {
 974           in_white_space = false;
 975           token[pos++] = c;
 976         }
 977       }
 978     } else {
 979       if (c == '\n' || (!in_quote && isspace(c))) {
 980         // token ends at newline, or at unquoted whitespace
 981         // this allows a way to include spaces in string-valued options
 982         token[pos] = '\0';
 983         logOption(token);
 984         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 985         build_jvm_flags(token);
 986         pos = 0;
 987         in_white_space = true;
 988         in_quote = false;
 989       } else if (!in_quote && (c == '\'' || c == '"')) {
 990         in_quote = true;
 991         quote_c = c;
 992       } else if (in_quote && (c == quote_c)) {
 993         in_quote = false;
 994       } else {
 995         token[pos++] = c;
 996       }
 997     }
 998     c = getc(stream);
 999   }
1000   if (pos > 0) {
1001     token[pos] = '\0';
1002     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1003     build_jvm_flags(token);
1004   }
1005   fclose(stream);
1006   return result;
1007 }
1008 
1009 //=============================================================================================================
1010 // Parsing of properties (-D)
1011 
1012 const char* Arguments::get_property(const char* key) {
1013   return PropertyList_get_value(system_properties(), key);
1014 }
1015 
1016 bool Arguments::add_property(const char* prop) {
1017   const char* eq = strchr(prop, '=');
1018   char* key;
1019   // ns must be static--its address may be stored in a SystemProperty object.
1020   const static char ns[1] = {0};
1021   char* value = (char *)ns;
1022 
1023   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1024   key = AllocateHeap(key_len + 1, mtInternal);
1025   strncpy(key, prop, key_len);
1026   key[key_len] = '\0';
1027 
1028   if (eq != NULL) {
1029     size_t value_len = strlen(prop) - key_len - 1;
1030     value = AllocateHeap(value_len + 1, mtInternal);
1031     strncpy(value, &prop[key_len + 1], value_len + 1);
1032   }
1033 
1034   if (strcmp(key, "java.compiler") == 0) {
1035     process_java_compiler_argument(value);
1036     FreeHeap(key);
1037     if (eq != NULL) {
1038       FreeHeap(value);
1039     }
1040     return true;
1041   } else if (strcmp(key, "sun.java.command") == 0) {
1042     _java_command = value;
1043 
1044     // Record value in Arguments, but let it get passed to Java.
1045   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1046              strcmp(key, "sun.java.launcher.pid") == 0) {
1047     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1048     // private and are processed in process_sun_java_launcher_properties();
1049     // the sun.java.launcher property is passed on to the java application
1050     FreeHeap(key);
1051     if (eq != NULL) {
1052       FreeHeap(value);
1053     }
1054     return true;
1055   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1056     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1057     // its value without going through the property list or making a Java call.
1058     _java_vendor_url_bug = value;
1059   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1060     PropertyList_unique_add(&_system_properties, key, value, true);
1061     return true;
1062   }
1063   // Create new property and add at the end of the list
1064   PropertyList_unique_add(&_system_properties, key, value);
1065   return true;
1066 }
1067 
1068 //===========================================================================================================
1069 // Setting int/mixed/comp mode flags
1070 
1071 void Arguments::set_mode_flags(Mode mode) {
1072   // Set up default values for all flags.
1073   // If you add a flag to any of the branches below,
1074   // add a default value for it here.
1075   set_java_compiler(false);
1076   _mode                      = mode;
1077 
1078   // Ensure Agent_OnLoad has the correct initial values.
1079   // This may not be the final mode; mode may change later in onload phase.
1080   PropertyList_unique_add(&_system_properties, "java.vm.info",
1081                           (char*)VM_Version::vm_info_string(), false);
1082 
1083   UseInterpreter             = true;
1084   UseCompiler                = true;
1085   UseLoopCounter             = true;
1086 
1087   // Default values may be platform/compiler dependent -
1088   // use the saved values
1089   ClipInlining               = Arguments::_ClipInlining;
1090   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1091   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1092   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1093 
1094   // Change from defaults based on mode
1095   switch (mode) {
1096   default:
1097     ShouldNotReachHere();
1098     break;
1099   case _int:
1100     UseCompiler              = false;
1101     UseLoopCounter           = false;
1102     AlwaysCompileLoopMethods = false;
1103     UseOnStackReplacement    = false;
1104     break;
1105   case _mixed:
1106     // same as default
1107     break;
1108   case _comp:
1109     UseInterpreter           = false;
1110     BackgroundCompilation    = false;
1111     ClipInlining             = false;
1112     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1113     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1114     // compile a level 4 (C2) and then continue executing it.
1115     if (TieredCompilation) {
1116       Tier3InvokeNotifyFreqLog = 0;
1117       Tier4InvocationThreshold = 0;
1118     }
1119     break;
1120   }
1121 }
1122 
1123 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1124 // Conflict: required to use shared spaces (-Xshare:on), but
1125 // incompatible command line options were chosen.
1126 
1127 static void no_shared_spaces(const char* message) {
1128   if (RequireSharedSpaces) {
1129     jio_fprintf(defaultStream::error_stream(),
1130       "Class data sharing is inconsistent with other specified options.\n");
1131     vm_exit_during_initialization("Unable to use shared archive.", message);
1132   } else {
1133     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1134   }
1135 }
1136 #endif
1137 
1138 void Arguments::set_tiered_flags() {
1139   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1140   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1141     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1142   }
1143   if (CompilationPolicyChoice < 2) {
1144     vm_exit_during_initialization(
1145       "Incompatible compilation policy selected", NULL);
1146   }
1147   // Increase the code cache size - tiered compiles a lot more.
1148   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1149     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1150   }
1151   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1152   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1153     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1154 
1155     // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1156     if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1157       FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1158     }
1159     if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1160       FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1161     }
1162     // Check consistency of code heap sizes
1163     if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1164       jio_fprintf(defaultStream::error_stream(),
1165                   "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1166                   NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1167                   (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1168       vm_exit(1);
1169     }
1170   }
1171   if (!UseInterpreter) { // -Xcomp
1172     Tier3InvokeNotifyFreqLog = 0;
1173     Tier4InvocationThreshold = 0;
1174   }
1175 }
1176 
1177 /**
1178  * Returns the minimum number of compiler threads needed to run the JVM. The following
1179  * configurations are possible.
1180  *
1181  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1182  *    compiler threads is 0.
1183  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1184  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1185  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1186  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1187  *    C1 can be used, so the minimum number of compiler threads is 1.
1188  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1189  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1190  *    the minimum number of compiler threads is 2.
1191  */
1192 int Arguments::get_min_number_of_compiler_threads() {
1193 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1194   return 0;   // case 1
1195 #else
1196   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1197     return 1; // case 2 or case 3
1198   }
1199   return 2;   // case 4 (tiered)
1200 #endif
1201 }
1202 
1203 #if INCLUDE_ALL_GCS
1204 static void disable_adaptive_size_policy(const char* collector_name) {
1205   if (UseAdaptiveSizePolicy) {
1206     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1207       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1208               collector_name);
1209     }
1210     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1211   }
1212 }
1213 
1214 void Arguments::set_parnew_gc_flags() {
1215   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1216          "control point invariant");
1217   assert(UseParNewGC, "Error");
1218 
1219   // Turn off AdaptiveSizePolicy for parnew until it is complete.
1220   disable_adaptive_size_policy("UseParNewGC");
1221 
1222   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1223     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1224     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1225   } else if (ParallelGCThreads == 0) {
1226     jio_fprintf(defaultStream::error_stream(),
1227         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1228     vm_exit(1);
1229   }
1230 
1231   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1232   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1233   // we set them to 1024 and 1024.
1234   // See CR 6362902.
1235   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1236     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1237   }
1238   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1239     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1240   }
1241 
1242   // When using compressed oops, we use local overflow stacks,
1243   // rather than using a global overflow list chained through
1244   // the klass word of the object's pre-image.
1245   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1246     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1247       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1248     }
1249     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1250   }
1251   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1252 }
1253 
1254 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1255 // sparc/solaris for certain applications, but would gain from
1256 // further optimization and tuning efforts, and would almost
1257 // certainly gain from analysis of platform and environment.
1258 void Arguments::set_cms_and_parnew_gc_flags() {
1259   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1260   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1261 
1262   // If we are using CMS, we prefer to UseParNewGC,
1263   // unless explicitly forbidden.
1264   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1265     FLAG_SET_ERGO(bool, UseParNewGC, true);
1266   }
1267 
1268   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1269   disable_adaptive_size_policy("UseConcMarkSweepGC");
1270 
1271   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1272   // as needed.
1273   if (UseParNewGC) {
1274     set_parnew_gc_flags();
1275   }
1276 
1277   size_t max_heap = align_size_down(MaxHeapSize,
1278                                     CardTableRS::ct_max_alignment_constraint());
1279 
1280   // Now make adjustments for CMS
1281   intx   tenuring_default = (intx)6;
1282   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1283 
1284   // Preferred young gen size for "short" pauses:
1285   // upper bound depends on # of threads and NewRatio.
1286   const uintx parallel_gc_threads =
1287     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1288   const size_t preferred_max_new_size_unaligned =
1289     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1290   size_t preferred_max_new_size =
1291     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1292 
1293   // Unless explicitly requested otherwise, size young gen
1294   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1295 
1296   // If either MaxNewSize or NewRatio is set on the command line,
1297   // assume the user is trying to set the size of the young gen.
1298   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1299 
1300     // Set MaxNewSize to our calculated preferred_max_new_size unless
1301     // NewSize was set on the command line and it is larger than
1302     // preferred_max_new_size.
1303     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1304       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1305     } else {
1306       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1307     }
1308     if (PrintGCDetails && Verbose) {
1309       // Too early to use gclog_or_tty
1310       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1311     }
1312 
1313     // Code along this path potentially sets NewSize and OldSize
1314     if (PrintGCDetails && Verbose) {
1315       // Too early to use gclog_or_tty
1316       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1317            " initial_heap_size:  " SIZE_FORMAT
1318            " max_heap: " SIZE_FORMAT,
1319            min_heap_size(), InitialHeapSize, max_heap);
1320     }
1321     size_t min_new = preferred_max_new_size;
1322     if (FLAG_IS_CMDLINE(NewSize)) {
1323       min_new = NewSize;
1324     }
1325     if (max_heap > min_new && min_heap_size() > min_new) {
1326       // Unless explicitly requested otherwise, make young gen
1327       // at least min_new, and at most preferred_max_new_size.
1328       if (FLAG_IS_DEFAULT(NewSize)) {
1329         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1330         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1331         if (PrintGCDetails && Verbose) {
1332           // Too early to use gclog_or_tty
1333           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1334         }
1335       }
1336       // Unless explicitly requested otherwise, size old gen
1337       // so it's NewRatio x of NewSize.
1338       if (FLAG_IS_DEFAULT(OldSize)) {
1339         if (max_heap > NewSize) {
1340           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1341           if (PrintGCDetails && Verbose) {
1342             // Too early to use gclog_or_tty
1343             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1344           }
1345         }
1346       }
1347     }
1348   }
1349   // Unless explicitly requested otherwise, definitely
1350   // promote all objects surviving "tenuring_default" scavenges.
1351   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1352       FLAG_IS_DEFAULT(SurvivorRatio)) {
1353     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1354   }
1355   // If we decided above (or user explicitly requested)
1356   // `promote all' (via MaxTenuringThreshold := 0),
1357   // prefer minuscule survivor spaces so as not to waste
1358   // space for (non-existent) survivors
1359   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1360     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1361   }
1362   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1363   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1364   // This is done in order to make ParNew+CMS configuration to work
1365   // with YoungPLABSize and OldPLABSize options.
1366   // See CR 6362902.
1367   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1368     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1369       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1370       // is.  In this situation let CMSParPromoteBlocksToClaim follow
1371       // the value (either from the command line or ergonomics) of
1372       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1373       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1374     } else {
1375       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1376       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1377       // we'll let it to take precedence.
1378       jio_fprintf(defaultStream::error_stream(),
1379                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1380                   " options are specified for the CMS collector."
1381                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1382     }
1383   }
1384   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1385     // OldPLAB sizing manually turned off: Use a larger default setting,
1386     // unless it was manually specified. This is because a too-low value
1387     // will slow down scavenges.
1388     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1389       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1390     }
1391   }
1392   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1393   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1394   // If either of the static initialization defaults have changed, note this
1395   // modification.
1396   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1397     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1398   }
1399   if (PrintGCDetails && Verbose) {
1400     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1401       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1402     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1403   }
1404 }
1405 #endif // INCLUDE_ALL_GCS
1406 
1407 void set_object_alignment() {
1408   // Object alignment.
1409   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1410   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1411   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1412   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1413   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1414   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1415 
1416   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1417   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1418 
1419   // Oop encoding heap max
1420   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1421 
1422 #if INCLUDE_ALL_GCS
1423   // Set CMS global values
1424   CompactibleFreeListSpace::set_cms_values();
1425 #endif // INCLUDE_ALL_GCS
1426 }
1427 
1428 bool verify_object_alignment() {
1429   // Object alignment.
1430   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1431     jio_fprintf(defaultStream::error_stream(),
1432                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1433                 (int)ObjectAlignmentInBytes);
1434     return false;
1435   }
1436   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1437     jio_fprintf(defaultStream::error_stream(),
1438                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1439                 (int)ObjectAlignmentInBytes, BytesPerLong);
1440     return false;
1441   }
1442   // It does not make sense to have big object alignment
1443   // since a space lost due to alignment will be greater
1444   // then a saved space from compressed oops.
1445   if ((int)ObjectAlignmentInBytes > 256) {
1446     jio_fprintf(defaultStream::error_stream(),
1447                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1448                 (int)ObjectAlignmentInBytes);
1449     return false;
1450   }
1451   // In case page size is very small.
1452   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1453     jio_fprintf(defaultStream::error_stream(),
1454                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1455                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1456     return false;
1457   }
1458   if(SurvivorAlignmentInBytes == 0) {
1459     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1460   } else {
1461     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1462       jio_fprintf(defaultStream::error_stream(),
1463             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1464             (int)SurvivorAlignmentInBytes);
1465       return false;
1466     }
1467     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1468       jio_fprintf(defaultStream::error_stream(),
1469           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1470           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1471       return false;
1472     }
1473   }
1474   return true;
1475 }
1476 
1477 size_t Arguments::max_heap_for_compressed_oops() {
1478   // Avoid sign flip.
1479   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1480   // We need to fit both the NULL page and the heap into the memory budget, while
1481   // keeping alignment constraints of the heap. To guarantee the latter, as the
1482   // NULL page is located before the heap, we pad the NULL page to the conservative
1483   // maximum alignment that the GC may ever impose upon the heap.
1484   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1485                                                         _conservative_max_heap_alignment);
1486 
1487   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1488   NOT_LP64(ShouldNotReachHere(); return 0);
1489 }
1490 
1491 bool Arguments::should_auto_select_low_pause_collector() {
1492   if (UseAutoGCSelectPolicy &&
1493       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1494       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1495     if (PrintGCDetails) {
1496       // Cannot use gclog_or_tty yet.
1497       tty->print_cr("Automatic selection of the low pause collector"
1498        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1499     }
1500     return true;
1501   }
1502   return false;
1503 }
1504 
1505 void Arguments::set_use_compressed_oops() {
1506 #ifndef ZERO
1507 #ifdef _LP64
1508   // MaxHeapSize is not set up properly at this point, but
1509   // the only value that can override MaxHeapSize if we are
1510   // to use UseCompressedOops is InitialHeapSize.
1511   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1512 
1513   if (max_heap_size <= max_heap_for_compressed_oops()) {
1514 #if !defined(COMPILER1) || defined(TIERED)
1515     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1516       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1517     }
1518 #endif
1519 #ifdef _WIN64
1520     if (UseLargePages && UseCompressedOops) {
1521       // Cannot allocate guard pages for implicit checks in indexed addressing
1522       // mode, when large pages are specified on windows.
1523       // This flag could be switched ON if narrow oop base address is set to 0,
1524       // see code in Universe::initialize_heap().
1525       Universe::set_narrow_oop_use_implicit_null_checks(false);
1526     }
1527 #endif //  _WIN64
1528   } else {
1529     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1530       warning("Max heap size too large for Compressed Oops");
1531       FLAG_SET_DEFAULT(UseCompressedOops, false);
1532       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1533     }
1534   }
1535 #endif // _LP64
1536 #endif // ZERO
1537 }
1538 
1539 
1540 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1541 // set_use_compressed_oops().
1542 void Arguments::set_use_compressed_klass_ptrs() {
1543 #ifndef ZERO
1544 #ifdef _LP64
1545   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1546   if (!UseCompressedOops) {
1547     if (UseCompressedClassPointers) {
1548       warning("UseCompressedClassPointers requires UseCompressedOops");
1549     }
1550     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1551   } else {
1552     // Turn on UseCompressedClassPointers too
1553     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1554       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1555     }
1556     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1557     if (UseCompressedClassPointers) {
1558       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1559         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1560         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1561       }
1562     }
1563   }
1564 #endif // _LP64
1565 #endif // !ZERO
1566 }
1567 
1568 void Arguments::set_conservative_max_heap_alignment() {
1569   // The conservative maximum required alignment for the heap is the maximum of
1570   // the alignments imposed by several sources: any requirements from the heap
1571   // itself, the collector policy and the maximum page size we may run the VM
1572   // with.
1573   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1574 #if INCLUDE_ALL_GCS
1575   if (UseParallelGC) {
1576     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1577   } else if (UseG1GC) {
1578     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1579   }
1580 #endif // INCLUDE_ALL_GCS
1581   _conservative_max_heap_alignment = MAX4(heap_alignment,
1582                                           (size_t)os::vm_allocation_granularity(),
1583                                           os::max_page_size(),
1584                                           CollectorPolicy::compute_heap_alignment());
1585 }
1586 
1587 void Arguments::select_gc_ergonomically() {
1588   if (os::is_server_class_machine()) {
1589     if (should_auto_select_low_pause_collector()) {
1590       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1591     } else {
1592       FLAG_SET_ERGO(bool, UseParallelGC, true);
1593     }
1594   }
1595 }
1596 
1597 void Arguments::select_gc() {
1598   if (!gc_selected()) {
1599     ArgumentsExt::select_gc_ergonomically();
1600   }
1601 }
1602 
1603 void Arguments::set_ergonomics_flags() {
1604   select_gc();
1605 
1606 #ifdef COMPILER2
1607   // Shared spaces work fine with other GCs but causes bytecode rewriting
1608   // to be disabled, which hurts interpreter performance and decreases
1609   // server performance.  When -server is specified, keep the default off
1610   // unless it is asked for.  Future work: either add bytecode rewriting
1611   // at link time, or rewrite bytecodes in non-shared methods.
1612   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1613       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1614     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1615   }
1616 #endif
1617 
1618   set_conservative_max_heap_alignment();
1619 
1620 #ifndef ZERO
1621 #ifdef _LP64
1622   set_use_compressed_oops();
1623 
1624   // set_use_compressed_klass_ptrs() must be called after calling
1625   // set_use_compressed_oops().
1626   set_use_compressed_klass_ptrs();
1627 
1628   // Also checks that certain machines are slower with compressed oops
1629   // in vm_version initialization code.
1630 #endif // _LP64
1631 #endif // !ZERO
1632 }
1633 
1634 void Arguments::set_parallel_gc_flags() {
1635   assert(UseParallelGC || UseParallelOldGC, "Error");
1636   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1637   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1638     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1639   }
1640   FLAG_SET_DEFAULT(UseParallelGC, true);
1641 
1642   // If no heap maximum was requested explicitly, use some reasonable fraction
1643   // of the physical memory, up to a maximum of 1GB.
1644   FLAG_SET_DEFAULT(ParallelGCThreads,
1645                    Abstract_VM_Version::parallel_worker_threads());
1646   if (ParallelGCThreads == 0) {
1647     jio_fprintf(defaultStream::error_stream(),
1648         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1649     vm_exit(1);
1650   }
1651 
1652   if (UseAdaptiveSizePolicy) {
1653     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1654     // unless the user actually sets these flags.
1655     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1656       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1657       _min_heap_free_ratio = MinHeapFreeRatio;
1658     }
1659     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1660       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1661       _max_heap_free_ratio = MaxHeapFreeRatio;
1662     }
1663   }
1664 
1665   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1666   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1667   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1668   // See CR 6362902 for details.
1669   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1670     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1671        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1672     }
1673     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1674       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1675     }
1676   }
1677 
1678   if (UseParallelOldGC) {
1679     // Par compact uses lower default values since they are treated as
1680     // minimums.  These are different defaults because of the different
1681     // interpretation and are not ergonomically set.
1682     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1683       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1684     }
1685   }
1686 }
1687 
1688 void Arguments::set_g1_gc_flags() {
1689   assert(UseG1GC, "Error");
1690 #ifdef COMPILER1
1691   FastTLABRefill = false;
1692 #endif
1693   FLAG_SET_DEFAULT(ParallelGCThreads,
1694                      Abstract_VM_Version::parallel_worker_threads());
1695   if (ParallelGCThreads == 0) {
1696     FLAG_SET_DEFAULT(ParallelGCThreads,
1697                      Abstract_VM_Version::parallel_worker_threads());
1698   }
1699 
1700   // MarkStackSize will be set (if it hasn't been set by the user)
1701   // when concurrent marking is initialized.
1702   // Its value will be based upon the number of parallel marking threads.
1703   // But we do set the maximum mark stack size here.
1704   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1705     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1706   }
1707 
1708   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1709     // In G1, we want the default GC overhead goal to be higher than
1710     // say in PS. So we set it here to 10%. Otherwise the heap might
1711     // be expanded more aggressively than we would like it to. In
1712     // fact, even 10% seems to not be high enough in some cases
1713     // (especially small GC stress tests that the main thing they do
1714     // is allocation). We might consider increase it further.
1715     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1716   }
1717 
1718   if (PrintGCDetails && Verbose) {
1719     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1720       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1721     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1722   }
1723 }
1724 
1725 #if !INCLUDE_ALL_GCS
1726 #ifdef ASSERT
1727 static bool verify_serial_gc_flags() {
1728   return (UseSerialGC &&
1729         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1730           UseParallelGC || UseParallelOldGC));
1731 }
1732 #endif // ASSERT
1733 #endif // INCLUDE_ALL_GCS
1734 
1735 void Arguments::set_gc_specific_flags() {
1736 #if INCLUDE_ALL_GCS
1737   // Set per-collector flags
1738   if (UseParallelGC || UseParallelOldGC) {
1739     set_parallel_gc_flags();
1740   } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1741     set_cms_and_parnew_gc_flags();
1742   } else if (UseParNewGC) {  // Skipped if CMS is set above
1743     set_parnew_gc_flags();
1744   } else if (UseG1GC) {
1745     set_g1_gc_flags();
1746   }
1747   check_deprecated_gcs();
1748   check_deprecated_gc_flags();
1749   if (AssumeMP && !UseSerialGC) {
1750     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1751       warning("If the number of processors is expected to increase from one, then"
1752               " you should configure the number of parallel GC threads appropriately"
1753               " using -XX:ParallelGCThreads=N");
1754     }
1755   }
1756   if (MinHeapFreeRatio == 100) {
1757     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1758     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1759   }
1760 #else // INCLUDE_ALL_GCS
1761   assert(verify_serial_gc_flags(), "SerialGC unset");
1762 #endif // INCLUDE_ALL_GCS
1763 }
1764 
1765 julong Arguments::limit_by_allocatable_memory(julong limit) {
1766   julong max_allocatable;
1767   julong result = limit;
1768   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1769     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1770   }
1771   return result;
1772 }
1773 
1774 // Use static initialization to get the default before parsing
1775 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1776 
1777 void Arguments::set_heap_size() {
1778   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1779     // Deprecated flag
1780     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1781   }
1782 
1783   const julong phys_mem =
1784     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1785                             : (julong)MaxRAM;
1786 
1787   // If the maximum heap size has not been set with -Xmx,
1788   // then set it as fraction of the size of physical memory,
1789   // respecting the maximum and minimum sizes of the heap.
1790   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1791     julong reasonable_max = phys_mem / MaxRAMFraction;
1792 
1793     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1794       // Small physical memory, so use a minimum fraction of it for the heap
1795       reasonable_max = phys_mem / MinRAMFraction;
1796     } else {
1797       // Not-small physical memory, so require a heap at least
1798       // as large as MaxHeapSize
1799       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1800     }
1801     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1802       // Limit the heap size to ErgoHeapSizeLimit
1803       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1804     }
1805     if (UseCompressedOops) {
1806       // Limit the heap size to the maximum possible when using compressed oops
1807       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1808 
1809       // HeapBaseMinAddress can be greater than default but not less than.
1810       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1811         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1812           // matches compressed oops printing flags
1813           if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1814             jio_fprintf(defaultStream::error_stream(),
1815                         "HeapBaseMinAddress must be at least " UINTX_FORMAT
1816                         " (" UINTX_FORMAT "G) which is greater than value given "
1817                         UINTX_FORMAT "\n",
1818                         DefaultHeapBaseMinAddress,
1819                         DefaultHeapBaseMinAddress/G,
1820                         HeapBaseMinAddress);
1821           }
1822           FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1823         }
1824       }
1825 
1826       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1827         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1828         // but it should be not less than default MaxHeapSize.
1829         max_coop_heap -= HeapBaseMinAddress;
1830       }
1831       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1832     }
1833     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1834 
1835     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1836       // An initial heap size was specified on the command line,
1837       // so be sure that the maximum size is consistent.  Done
1838       // after call to limit_by_allocatable_memory because that
1839       // method might reduce the allocation size.
1840       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1841     }
1842 
1843     if (PrintGCDetails && Verbose) {
1844       // Cannot use gclog_or_tty yet.
1845       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1846     }
1847     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1848   }
1849 
1850   // If the minimum or initial heap_size have not been set or requested to be set
1851   // ergonomically, set them accordingly.
1852   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1853     julong reasonable_minimum = (julong)(OldSize + NewSize);
1854 
1855     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1856 
1857     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1858 
1859     if (InitialHeapSize == 0) {
1860       julong reasonable_initial = phys_mem / InitialRAMFraction;
1861 
1862       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1863       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1864 
1865       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1866 
1867       if (PrintGCDetails && Verbose) {
1868         // Cannot use gclog_or_tty yet.
1869         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1870       }
1871       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1872     }
1873     // If the minimum heap size has not been set (via -Xms),
1874     // synchronize with InitialHeapSize to avoid errors with the default value.
1875     if (min_heap_size() == 0) {
1876       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1877       if (PrintGCDetails && Verbose) {
1878         // Cannot use gclog_or_tty yet.
1879         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1880       }
1881     }
1882   }
1883 }
1884 
1885 // This must be called after ergonomics because we want bytecode rewriting
1886 // if the server compiler is used, or if UseSharedSpaces is disabled.
1887 void Arguments::set_bytecode_flags() {
1888   // Better not attempt to store into a read-only space.
1889   if (UseSharedSpaces) {
1890     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1891     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1892   }
1893 
1894   if (!RewriteBytecodes) {
1895     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1896   }
1897 }
1898 
1899 // Aggressive optimization flags  -XX:+AggressiveOpts
1900 void Arguments::set_aggressive_opts_flags() {
1901 #ifdef COMPILER2
1902   if (AggressiveUnboxing) {
1903     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1904       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1905     } else if (!EliminateAutoBox) {
1906       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1907       AggressiveUnboxing = false;
1908     }
1909     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1910       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1911     } else if (!DoEscapeAnalysis) {
1912       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1913       AggressiveUnboxing = false;
1914     }
1915   }
1916   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1917     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1918       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1919     }
1920     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1921       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1922     }
1923 
1924     // Feed the cache size setting into the JDK
1925     char buffer[1024];
1926     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1927     add_property(buffer);
1928   }
1929   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1930     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1931   }
1932 #endif
1933 
1934   if (AggressiveOpts) {
1935 // Sample flag setting code
1936 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1937 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1938 //    }
1939   }
1940 }
1941 
1942 //===========================================================================================================
1943 // Parsing of java.compiler property
1944 
1945 void Arguments::process_java_compiler_argument(char* arg) {
1946   // For backwards compatibility, Djava.compiler=NONE or ""
1947   // causes us to switch to -Xint mode UNLESS -Xdebug
1948   // is also specified.
1949   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1950     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1951   }
1952 }
1953 
1954 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1955   _sun_java_launcher = os::strdup_check_oom(launcher);
1956 }
1957 
1958 bool Arguments::created_by_java_launcher() {
1959   assert(_sun_java_launcher != NULL, "property must have value");
1960   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1961 }
1962 
1963 bool Arguments::sun_java_launcher_is_altjvm() {
1964   return _sun_java_launcher_is_altjvm;
1965 }
1966 
1967 //===========================================================================================================
1968 // Parsing of main arguments
1969 
1970 bool Arguments::verify_interval(uintx val, uintx min,
1971                                 uintx max, const char* name) {
1972   // Returns true iff value is in the inclusive interval [min..max]
1973   // false, otherwise.
1974   if (val >= min && val <= max) {
1975     return true;
1976   }
1977   jio_fprintf(defaultStream::error_stream(),
1978               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1979               " and " UINTX_FORMAT "\n",
1980               name, val, min, max);
1981   return false;
1982 }
1983 
1984 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1985   // Returns true if given value is at least specified min threshold
1986   // false, otherwise.
1987   if (val >= min ) {
1988       return true;
1989   }
1990   jio_fprintf(defaultStream::error_stream(),
1991               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1992               name, val, min);
1993   return false;
1994 }
1995 
1996 bool Arguments::verify_percentage(uintx value, const char* name) {
1997   if (is_percentage(value)) {
1998     return true;
1999   }
2000   jio_fprintf(defaultStream::error_stream(),
2001               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2002               name, value);
2003   return false;
2004 }
2005 
2006 // check if do gclog rotation
2007 // +UseGCLogFileRotation is a must,
2008 // no gc log rotation when log file not supplied or
2009 // NumberOfGCLogFiles is 0
2010 void check_gclog_consistency() {
2011   if (UseGCLogFileRotation) {
2012     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2013       jio_fprintf(defaultStream::output_stream(),
2014                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2015                   "where num_of_file > 0\n"
2016                   "GC log rotation is turned off\n");
2017       UseGCLogFileRotation = false;
2018     }
2019   }
2020 
2021   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2022     FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2023     jio_fprintf(defaultStream::output_stream(),
2024                 "GCLogFileSize changed to minimum 8K\n");
2025   }
2026 }
2027 
2028 // This function is called for -Xloggc:<filename>, it can be used
2029 // to check if a given file name(or string) conforms to the following
2030 // specification:
2031 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2032 // %p and %t only allowed once. We only limit usage of filename not path
2033 bool is_filename_valid(const char *file_name) {
2034   const char* p = file_name;
2035   char file_sep = os::file_separator()[0];
2036   const char* cp;
2037   // skip prefix path
2038   for (cp = file_name; *cp != '\0'; cp++) {
2039     if (*cp == '/' || *cp == file_sep) {
2040       p = cp + 1;
2041     }
2042   }
2043 
2044   int count_p = 0;
2045   int count_t = 0;
2046   while (*p != '\0') {
2047     if ((*p >= '0' && *p <= '9') ||
2048         (*p >= 'A' && *p <= 'Z') ||
2049         (*p >= 'a' && *p <= 'z') ||
2050          *p == '-'               ||
2051          *p == '_'               ||
2052          *p == '.') {
2053        p++;
2054        continue;
2055     }
2056     if (*p == '%') {
2057       if(*(p + 1) == 'p') {
2058         p += 2;
2059         count_p ++;
2060         continue;
2061       }
2062       if (*(p + 1) == 't') {
2063         p += 2;
2064         count_t ++;
2065         continue;
2066       }
2067     }
2068     return false;
2069   }
2070   return count_p < 2 && count_t < 2;
2071 }
2072 
2073 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2074   if (!is_percentage(min_heap_free_ratio)) {
2075     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2076     return false;
2077   }
2078   if (min_heap_free_ratio > MaxHeapFreeRatio) {
2079     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2080                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2081                   MaxHeapFreeRatio);
2082     return false;
2083   }
2084   // This does not set the flag itself, but stores the value in a safe place for later usage.
2085   _min_heap_free_ratio = min_heap_free_ratio;
2086   return true;
2087 }
2088 
2089 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2090   if (!is_percentage(max_heap_free_ratio)) {
2091     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2092     return false;
2093   }
2094   if (max_heap_free_ratio < MinHeapFreeRatio) {
2095     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2096                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2097                   MinHeapFreeRatio);
2098     return false;
2099   }
2100   // This does not set the flag itself, but stores the value in a safe place for later usage.
2101   _max_heap_free_ratio = max_heap_free_ratio;
2102   return true;
2103 }
2104 
2105 // Check consistency of GC selection
2106 bool Arguments::check_gc_consistency_user() {
2107   check_gclog_consistency();
2108   bool status = true;
2109   // Ensure that the user has not selected conflicting sets
2110   // of collectors. [Note: this check is merely a user convenience;
2111   // collectors over-ride each other so that only a non-conflicting
2112   // set is selected; however what the user gets is not what they
2113   // may have expected from the combination they asked for. It's
2114   // better to reduce user confusion by not allowing them to
2115   // select conflicting combinations.
2116   uint i = 0;
2117   if (UseSerialGC)                       i++;
2118   if (UseConcMarkSweepGC || UseParNewGC) i++;
2119   if (UseParallelGC || UseParallelOldGC) i++;
2120   if (UseG1GC)                           i++;
2121   if (i > 1) {
2122     jio_fprintf(defaultStream::error_stream(),
2123                 "Conflicting collector combinations in option list; "
2124                 "please refer to the release notes for the combinations "
2125                 "allowed\n");
2126     status = false;
2127   }
2128   return status;
2129 }
2130 
2131 void Arguments::check_deprecated_gcs() {
2132   if (UseConcMarkSweepGC && !UseParNewGC) {
2133     warning("Using the DefNew young collector with the CMS collector is deprecated "
2134         "and will likely be removed in a future release");
2135   }
2136 
2137   if (UseParNewGC && !UseConcMarkSweepGC) {
2138     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2139     // set up UseSerialGC properly, so that can't be used in the check here.
2140     warning("Using the ParNew young collector with the Serial old collector is deprecated "
2141         "and will likely be removed in a future release");
2142   }
2143 
2144   if (CMSIncrementalMode) {
2145     warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2146   }
2147 }
2148 
2149 void Arguments::check_deprecated_gc_flags() {
2150   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2151     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2152             "and will likely be removed in future release");
2153   }
2154   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2155     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2156         "Use MaxRAMFraction instead.");
2157   }
2158   if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2159     warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2160   }
2161   if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2162     warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2163   }
2164   if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2165     warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2166   }
2167 }
2168 
2169 // Check stack pages settings
2170 bool Arguments::check_stack_pages()
2171 {
2172   bool status = true;
2173   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2174   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2175   // greater stack shadow pages can't generate instruction to bang stack
2176   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2177   return status;
2178 }
2179 
2180 // Check the consistency of vm_init_args
2181 bool Arguments::check_vm_args_consistency() {
2182   // Method for adding checks for flag consistency.
2183   // The intent is to warn the user of all possible conflicts,
2184   // before returning an error.
2185   // Note: Needs platform-dependent factoring.
2186   bool status = true;
2187 
2188   if (TLABRefillWasteFraction == 0) {
2189     jio_fprintf(defaultStream::error_stream(),
2190                 "TLABRefillWasteFraction should be a denominator, "
2191                 "not " SIZE_FORMAT "\n",
2192                 TLABRefillWasteFraction);
2193     status = false;
2194   }
2195 
2196   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2197                               "AdaptiveSizePolicyWeight");
2198   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2199 
2200   // Divide by bucket size to prevent a large size from causing rollover when
2201   // calculating amount of memory needed to be allocated for the String table.
2202   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2203     (max_uintx / StringTable::bucket_size()), "StringTable size");
2204 
2205   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2206     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2207 
2208   {
2209     // Using "else if" below to avoid printing two error messages if min > max.
2210     // This will also prevent us from reporting both min>100 and max>100 at the
2211     // same time, but that is less annoying than printing two identical errors IMHO.
2212     FormatBuffer<80> err_msg("%s","");
2213     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2214       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2215       status = false;
2216     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2217       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2218       status = false;
2219     }
2220   }
2221 
2222   // Min/MaxMetaspaceFreeRatio
2223   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2224   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2225 
2226   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2227     jio_fprintf(defaultStream::error_stream(),
2228                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2229                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2230                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2231                 MinMetaspaceFreeRatio,
2232                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2233                 MaxMetaspaceFreeRatio);
2234     status = false;
2235   }
2236 
2237   // Trying to keep 100% free is not practical
2238   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2239 
2240   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2241     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2242   }
2243 
2244   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2245     // Settings to encourage splitting.
2246     if (!FLAG_IS_CMDLINE(NewRatio)) {
2247       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2248     }
2249     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2250       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2251     }
2252   }
2253 
2254   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2255     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2256   }
2257 
2258   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2259   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2260   if (GCTimeLimit == 100) {
2261     // Turn off gc-overhead-limit-exceeded checks
2262     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2263   }
2264 
2265   status = status && ArgumentsExt::check_gc_consistency_user();
2266   status = status && check_stack_pages();
2267 
2268   if (CMSIncrementalMode) {
2269     if (!UseConcMarkSweepGC) {
2270       jio_fprintf(defaultStream::error_stream(),
2271                   "error:  invalid argument combination.\n"
2272                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2273                   "selected in order\nto use CMSIncrementalMode.\n");
2274       status = false;
2275     } else {
2276       status = status && verify_percentage(CMSIncrementalDutyCycle,
2277                                   "CMSIncrementalDutyCycle");
2278       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2279                                   "CMSIncrementalDutyCycleMin");
2280       status = status && verify_percentage(CMSIncrementalSafetyFactor,
2281                                   "CMSIncrementalSafetyFactor");
2282       status = status && verify_percentage(CMSIncrementalOffset,
2283                                   "CMSIncrementalOffset");
2284       status = status && verify_percentage(CMSExpAvgFactor,
2285                                   "CMSExpAvgFactor");
2286       // If it was not set on the command line, set
2287       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2288       if (CMSInitiatingOccupancyFraction < 0) {
2289         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2290       }
2291     }
2292   }
2293 
2294   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2295   // insists that we hold the requisite locks so that the iteration is
2296   // MT-safe. For the verification at start-up and shut-down, we don't
2297   // yet have a good way of acquiring and releasing these locks,
2298   // which are not visible at the CollectedHeap level. We want to
2299   // be able to acquire these locks and then do the iteration rather
2300   // than just disable the lock verification. This will be fixed under
2301   // bug 4788986.
2302   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2303     if (VerifyDuringStartup) {
2304       warning("Heap verification at start-up disabled "
2305               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2306       VerifyDuringStartup = false; // Disable verification at start-up
2307     }
2308 
2309     if (VerifyBeforeExit) {
2310       warning("Heap verification at shutdown disabled "
2311               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2312       VerifyBeforeExit = false; // Disable verification at shutdown
2313     }
2314   }
2315 
2316   // Note: only executed in non-PRODUCT mode
2317   if (!UseAsyncConcMarkSweepGC &&
2318       (ExplicitGCInvokesConcurrent ||
2319        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2320     jio_fprintf(defaultStream::error_stream(),
2321                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2322                 " with -UseAsyncConcMarkSweepGC");
2323     status = false;
2324   }
2325 
2326   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2327 
2328 #if INCLUDE_ALL_GCS
2329   if (UseG1GC) {
2330     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2331     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2332     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2333 
2334     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2335                                          "InitiatingHeapOccupancyPercent");
2336     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2337                                         "G1RefProcDrainInterval");
2338     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2339                                         "G1ConcMarkStepDurationMillis");
2340     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2341                                        "G1ConcRSHotCardLimit");
2342     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2343                                        "G1ConcRSLogCacheSize");
2344     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2345                                        "StringDeduplicationAgeThreshold");
2346   }
2347   if (UseConcMarkSweepGC) {
2348     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2349     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2350     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2351     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2352 
2353     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2354 
2355     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2356     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2357     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2358 
2359     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2360 
2361     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2362     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2363 
2364     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2365     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2366     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2367 
2368     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2369 
2370     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2371 
2372     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2373     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2374     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2375     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2376     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2377   }
2378 
2379   if (UseParallelGC || UseParallelOldGC) {
2380     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2381     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2382 
2383     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2384     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2385 
2386     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2387     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2388 
2389     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2390 
2391     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2392   }
2393 #endif // INCLUDE_ALL_GCS
2394 
2395   status = status && verify_interval(RefDiscoveryPolicy,
2396                                      ReferenceProcessor::DiscoveryPolicyMin,
2397                                      ReferenceProcessor::DiscoveryPolicyMax,
2398                                      "RefDiscoveryPolicy");
2399 
2400   // Limit the lower bound of this flag to 1 as it is used in a division
2401   // expression.
2402   status = status && verify_interval(TLABWasteTargetPercent,
2403                                      1, 100, "TLABWasteTargetPercent");
2404 
2405   status = status && verify_object_alignment();
2406 
2407   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2408                                       "CompressedClassSpaceSize");
2409 
2410   status = status && verify_interval(MarkStackSizeMax,
2411                                   1, (max_jint - 1), "MarkStackSizeMax");
2412   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2413 
2414   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2415 
2416   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2417 
2418   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2419 
2420   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2421   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2422 
2423   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2424 
2425   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2426   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2427   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2428   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2429 
2430   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2431   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2432 
2433   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2434   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2435   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2436 
2437   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2438   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2439 
2440   status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2441   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2442   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2443   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2444 
2445   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2446 #ifdef COMPILER1
2447   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2448 #endif
2449 
2450   if (PrintNMTStatistics) {
2451 #if INCLUDE_NMT
2452     if (MemTracker::tracking_level() == NMT_off) {
2453 #endif // INCLUDE_NMT
2454       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2455       PrintNMTStatistics = false;
2456 #if INCLUDE_NMT
2457     }
2458 #endif
2459   }
2460 
2461   // Need to limit the extent of the padding to reasonable size.
2462   // 8K is well beyond the reasonable HW cache line size, even with the
2463   // aggressive prefetching, while still leaving the room for segregating
2464   // among the distinct pages.
2465   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2466     jio_fprintf(defaultStream::error_stream(),
2467                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2468                 ContendedPaddingWidth, 0, 8192);
2469     status = false;
2470   }
2471 
2472   // Need to enforce the padding not to break the existing field alignments.
2473   // It is sufficient to check against the largest type size.
2474   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2475     jio_fprintf(defaultStream::error_stream(),
2476                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2477                 ContendedPaddingWidth, BytesPerLong);
2478     status = false;
2479   }
2480 
2481   // Check lower bounds of the code cache
2482   // Template Interpreter code is approximately 3X larger in debug builds.
2483   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2484   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2485     jio_fprintf(defaultStream::error_stream(),
2486                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2487                 os::vm_page_size()/K);
2488     status = false;
2489   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2490     jio_fprintf(defaultStream::error_stream(),
2491                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2492                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2493     status = false;
2494   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2495     jio_fprintf(defaultStream::error_stream(),
2496                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2497                 min_code_cache_size/K);
2498     status = false;
2499   } else if (ReservedCodeCacheSize > 2*G) {
2500     // Code cache size larger than MAXINT is not supported.
2501     jio_fprintf(defaultStream::error_stream(),
2502                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2503                 (2*G)/M);
2504     status = false;
2505   } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2506     jio_fprintf(defaultStream::error_stream(),
2507                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2508                 min_code_cache_size/K);
2509     status = false;
2510   } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2511              && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2512     jio_fprintf(defaultStream::error_stream(),
2513                 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2514                 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2515                 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2516     status = false;
2517   }
2518 
2519   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2520   status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2521   status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2522   status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2523 
2524 
2525   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2526   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2527   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2528   // Check the minimum number of compiler threads
2529   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2530 
2531   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2532     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2533   }
2534 
2535   return status;
2536 }
2537 
2538 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2539   const char* option_type) {
2540   if (ignore) return false;
2541 
2542   const char* spacer = " ";
2543   if (option_type == NULL) {
2544     option_type = ++spacer; // Set both to the empty string.
2545   }
2546 
2547   if (os::obsolete_option(option)) {
2548     jio_fprintf(defaultStream::error_stream(),
2549                 "Obsolete %s%soption: %s\n", option_type, spacer,
2550       option->optionString);
2551     return false;
2552   } else {
2553     jio_fprintf(defaultStream::error_stream(),
2554                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2555       option->optionString);
2556     return true;
2557   }
2558 }
2559 
2560 static const char* user_assertion_options[] = {
2561   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2562 };
2563 
2564 static const char* system_assertion_options[] = {
2565   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2566 };
2567 
2568 // Return true if any of the strings in null-terminated array 'names' matches.
2569 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2570 // the option must match exactly.
2571 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2572   bool tail_allowed) {
2573   for (/* empty */; *names != NULL; ++names) {
2574     if (match_option(option, *names, tail)) {
2575       if (**tail == '\0' || tail_allowed && **tail == ':') {
2576         return true;
2577       }
2578     }
2579   }
2580   return false;
2581 }
2582 
2583 bool Arguments::parse_uintx(const char* value,
2584                             uintx* uintx_arg,
2585                             uintx min_size) {
2586 
2587   // Check the sign first since atomull() parses only unsigned values.
2588   bool value_is_positive = !(*value == '-');
2589 
2590   if (value_is_positive) {
2591     julong n;
2592     bool good_return = atomull(value, &n);
2593     if (good_return) {
2594       bool above_minimum = n >= min_size;
2595       bool value_is_too_large = n > max_uintx;
2596 
2597       if (above_minimum && !value_is_too_large) {
2598         *uintx_arg = n;
2599         return true;
2600       }
2601     }
2602   }
2603   return false;
2604 }
2605 
2606 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2607                                                   julong* long_arg,
2608                                                   julong min_size) {
2609   if (!atomull(s, long_arg)) return arg_unreadable;
2610   return check_memory_size(*long_arg, min_size);
2611 }
2612 
2613 // Parse JavaVMInitArgs structure
2614 
2615 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2616   // For components of the system classpath.
2617   SysClassPath scp(Arguments::get_sysclasspath());
2618   bool scp_assembly_required = false;
2619 
2620   // Save default settings for some mode flags
2621   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2622   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2623   Arguments::_ClipInlining             = ClipInlining;
2624   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2625 
2626   // Setup flags for mixed which is the default
2627   set_mode_flags(_mixed);
2628 
2629   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2630   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2631   if (result != JNI_OK) {
2632     return result;
2633   }
2634 
2635   // Parse JavaVMInitArgs structure passed in
2636   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2637   if (result != JNI_OK) {
2638     return result;
2639   }
2640 
2641   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2642   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2643   if (result != JNI_OK) {
2644     return result;
2645   }
2646 
2647   // Do final processing now that all arguments have been parsed
2648   result = finalize_vm_init_args(&scp, scp_assembly_required);
2649   if (result != JNI_OK) {
2650     return result;
2651   }
2652 
2653   return JNI_OK;
2654 }
2655 
2656 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2657 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2658 // are dealing with -agentpath (case where name is a path), otherwise with
2659 // -agentlib
2660 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2661   char *_name;
2662   const char *_hprof = "hprof", *_jdwp = "jdwp";
2663   size_t _len_hprof, _len_jdwp, _len_prefix;
2664 
2665   if (is_path) {
2666     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2667       return false;
2668     }
2669 
2670     _name++;  // skip past last path separator
2671     _len_prefix = strlen(JNI_LIB_PREFIX);
2672 
2673     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2674       return false;
2675     }
2676 
2677     _name += _len_prefix;
2678     _len_hprof = strlen(_hprof);
2679     _len_jdwp = strlen(_jdwp);
2680 
2681     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2682       _name += _len_hprof;
2683     }
2684     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2685       _name += _len_jdwp;
2686     }
2687     else {
2688       return false;
2689     }
2690 
2691     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2692       return false;
2693     }
2694 
2695     return true;
2696   }
2697 
2698   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2699     return true;
2700   }
2701 
2702   return false;
2703 }
2704 
2705 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2706                                        SysClassPath* scp_p,
2707                                        bool* scp_assembly_required_p,
2708                                        Flag::Flags origin) {
2709   // Remaining part of option string
2710   const char* tail;
2711 
2712   // iterate over arguments
2713   for (int index = 0; index < args->nOptions; index++) {
2714     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2715 
2716     const JavaVMOption* option = args->options + index;
2717 
2718     if (!match_option(option, "-Djava.class.path", &tail) &&
2719         !match_option(option, "-Dsun.java.command", &tail) &&
2720         !match_option(option, "-Dsun.java.launcher", &tail)) {
2721 
2722         // add all jvm options to the jvm_args string. This string
2723         // is used later to set the java.vm.args PerfData string constant.
2724         // the -Djava.class.path and the -Dsun.java.command options are
2725         // omitted from jvm_args string as each have their own PerfData
2726         // string constant object.
2727         build_jvm_args(option->optionString);
2728     }
2729 
2730     // -verbose:[class/gc/jni]
2731     if (match_option(option, "-verbose", &tail)) {
2732       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2733         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2734         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2735       } else if (!strcmp(tail, ":gc")) {
2736         FLAG_SET_CMDLINE(bool, PrintGC, true);
2737       } else if (!strcmp(tail, ":jni")) {
2738         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2739       }
2740     // -da / -ea / -disableassertions / -enableassertions
2741     // These accept an optional class/package name separated by a colon, e.g.,
2742     // -da:java.lang.Thread.
2743     } else if (match_option(option, user_assertion_options, &tail, true)) {
2744       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2745       if (*tail == '\0') {
2746         JavaAssertions::setUserClassDefault(enable);
2747       } else {
2748         assert(*tail == ':', "bogus match by match_option()");
2749         JavaAssertions::addOption(tail + 1, enable);
2750       }
2751     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2752     } else if (match_option(option, system_assertion_options, &tail, false)) {
2753       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2754       JavaAssertions::setSystemClassDefault(enable);
2755     // -bootclasspath:
2756     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2757       scp_p->reset_path(tail);
2758       *scp_assembly_required_p = true;
2759     // -bootclasspath/a:
2760     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2761       scp_p->add_suffix(tail);
2762       *scp_assembly_required_p = true;
2763     // -bootclasspath/p:
2764     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2765       scp_p->add_prefix(tail);
2766       *scp_assembly_required_p = true;
2767     // -Xrun
2768     } else if (match_option(option, "-Xrun", &tail)) {
2769       if (tail != NULL) {
2770         const char* pos = strchr(tail, ':');
2771         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2772         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2773         name[len] = '\0';
2774 
2775         char *options = NULL;
2776         if(pos != NULL) {
2777           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2778           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2779         }
2780 #if !INCLUDE_JVMTI
2781         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2782           jio_fprintf(defaultStream::error_stream(),
2783             "Profiling and debugging agents are not supported in this VM\n");
2784           return JNI_ERR;
2785         }
2786 #endif // !INCLUDE_JVMTI
2787         add_init_library(name, options);
2788       }
2789     // -agentlib and -agentpath
2790     } else if (match_option(option, "-agentlib:", &tail) ||
2791           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2792       if(tail != NULL) {
2793         const char* pos = strchr(tail, '=');
2794         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2795         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2796         name[len] = '\0';
2797 
2798         char *options = NULL;
2799         if(pos != NULL) {
2800           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2801         }
2802 #if !INCLUDE_JVMTI
2803         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2804           jio_fprintf(defaultStream::error_stream(),
2805             "Profiling and debugging agents are not supported in this VM\n");
2806           return JNI_ERR;
2807         }
2808 #endif // !INCLUDE_JVMTI
2809         add_init_agent(name, options, is_absolute_path);
2810       }
2811     // -javaagent
2812     } else if (match_option(option, "-javaagent:", &tail)) {
2813 #if !INCLUDE_JVMTI
2814       jio_fprintf(defaultStream::error_stream(),
2815         "Instrumentation agents are not supported in this VM\n");
2816       return JNI_ERR;
2817 #else
2818       if(tail != NULL) {
2819         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2820         add_init_agent("instrument", options, false);
2821       }
2822 #endif // !INCLUDE_JVMTI
2823     // -Xnoclassgc
2824     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2825       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2826     // -Xincgc: i-CMS
2827     } else if (match_option(option, "-Xincgc", &tail)) {
2828       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2829       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2830     // -Xnoincgc: no i-CMS
2831     } else if (match_option(option, "-Xnoincgc", &tail)) {
2832       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2833       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2834     // -Xconcgc
2835     } else if (match_option(option, "-Xconcgc", &tail)) {
2836       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2837     // -Xnoconcgc
2838     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2839       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2840     // -Xbatch
2841     } else if (match_option(option, "-Xbatch", &tail)) {
2842       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2843     // -Xmn for compatibility with other JVM vendors
2844     } else if (match_option(option, "-Xmn", &tail)) {
2845       julong long_initial_young_size = 0;
2846       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2847       if (errcode != arg_in_range) {
2848         jio_fprintf(defaultStream::error_stream(),
2849                     "Invalid initial young generation size: %s\n", option->optionString);
2850         describe_range_error(errcode);
2851         return JNI_EINVAL;
2852       }
2853       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2854       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2855     // -Xms
2856     } else if (match_option(option, "-Xms", &tail)) {
2857       julong long_initial_heap_size = 0;
2858       // an initial heap size of 0 means automatically determine
2859       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2860       if (errcode != arg_in_range) {
2861         jio_fprintf(defaultStream::error_stream(),
2862                     "Invalid initial heap size: %s\n", option->optionString);
2863         describe_range_error(errcode);
2864         return JNI_EINVAL;
2865       }
2866       set_min_heap_size((uintx)long_initial_heap_size);
2867       // Currently the minimum size and the initial heap sizes are the same.
2868       // Can be overridden with -XX:InitialHeapSize.
2869       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2870     // -Xmx
2871     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2872       julong long_max_heap_size = 0;
2873       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2874       if (errcode != arg_in_range) {
2875         jio_fprintf(defaultStream::error_stream(),
2876                     "Invalid maximum heap size: %s\n", option->optionString);
2877         describe_range_error(errcode);
2878         return JNI_EINVAL;
2879       }
2880       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2881     // Xmaxf
2882     } else if (match_option(option, "-Xmaxf", &tail)) {
2883       char* err;
2884       int maxf = (int)(strtod(tail, &err) * 100);
2885       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2886         jio_fprintf(defaultStream::error_stream(),
2887                     "Bad max heap free percentage size: %s\n",
2888                     option->optionString);
2889         return JNI_EINVAL;
2890       } else {
2891         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2892       }
2893     // Xminf
2894     } else if (match_option(option, "-Xminf", &tail)) {
2895       char* err;
2896       int minf = (int)(strtod(tail, &err) * 100);
2897       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2898         jio_fprintf(defaultStream::error_stream(),
2899                     "Bad min heap free percentage size: %s\n",
2900                     option->optionString);
2901         return JNI_EINVAL;
2902       } else {
2903         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2904       }
2905     // -Xss
2906     } else if (match_option(option, "-Xss", &tail)) {
2907       julong long_ThreadStackSize = 0;
2908       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2909       if (errcode != arg_in_range) {
2910         jio_fprintf(defaultStream::error_stream(),
2911                     "Invalid thread stack size: %s\n", option->optionString);
2912         describe_range_error(errcode);
2913         return JNI_EINVAL;
2914       }
2915       // Internally track ThreadStackSize in units of 1024 bytes.
2916       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2917                               round_to((int)long_ThreadStackSize, K) / K);
2918     // -Xoss
2919     } else if (match_option(option, "-Xoss", &tail)) {
2920           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2921     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2922       julong long_CodeCacheExpansionSize = 0;
2923       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2924       if (errcode != arg_in_range) {
2925         jio_fprintf(defaultStream::error_stream(),
2926                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2927                    os::vm_page_size()/K);
2928         return JNI_EINVAL;
2929       }
2930       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2931     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2932                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2933       julong long_ReservedCodeCacheSize = 0;
2934 
2935       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2936       if (errcode != arg_in_range) {
2937         jio_fprintf(defaultStream::error_stream(),
2938                     "Invalid maximum code cache size: %s.\n", option->optionString);
2939         return JNI_EINVAL;
2940       }
2941       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2942       // -XX:NonNMethodCodeHeapSize=
2943     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2944       julong long_NonNMethodCodeHeapSize = 0;
2945 
2946       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2947       if (errcode != arg_in_range) {
2948         jio_fprintf(defaultStream::error_stream(),
2949                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2950         return JNI_EINVAL;
2951       }
2952       FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2953       // -XX:ProfiledCodeHeapSize=
2954     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2955       julong long_ProfiledCodeHeapSize = 0;
2956 
2957       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2958       if (errcode != arg_in_range) {
2959         jio_fprintf(defaultStream::error_stream(),
2960                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2961         return JNI_EINVAL;
2962       }
2963       FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2964       // -XX:NonProfiledCodeHeapSizee=
2965     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2966       julong long_NonProfiledCodeHeapSize = 0;
2967 
2968       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2969       if (errcode != arg_in_range) {
2970         jio_fprintf(defaultStream::error_stream(),
2971                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2972         return JNI_EINVAL;
2973       }
2974       FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2975       //-XX:IncreaseFirstTierCompileThresholdAt=
2976     } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2977         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2978         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2979           jio_fprintf(defaultStream::error_stream(),
2980                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2981                       option->optionString);
2982           return JNI_EINVAL;
2983         }
2984         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2985     // -green
2986     } else if (match_option(option, "-green", &tail)) {
2987       jio_fprintf(defaultStream::error_stream(),
2988                   "Green threads support not available\n");
2989           return JNI_EINVAL;
2990     // -native
2991     } else if (match_option(option, "-native", &tail)) {
2992           // HotSpot always uses native threads, ignore silently for compatibility
2993     // -Xsqnopause
2994     } else if (match_option(option, "-Xsqnopause", &tail)) {
2995           // EVM option, ignore silently for compatibility
2996     // -Xrs
2997     } else if (match_option(option, "-Xrs", &tail)) {
2998           // Classic/EVM option, new functionality
2999       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3000     } else if (match_option(option, "-Xusealtsigs", &tail)) {
3001           // change default internal VM signals used - lower case for back compat
3002       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3003     // -Xoptimize
3004     } else if (match_option(option, "-Xoptimize", &tail)) {
3005           // EVM option, ignore silently for compatibility
3006     // -Xprof
3007     } else if (match_option(option, "-Xprof", &tail)) {
3008 #if INCLUDE_FPROF
3009       _has_profile = true;
3010 #else // INCLUDE_FPROF
3011       jio_fprintf(defaultStream::error_stream(),
3012         "Flat profiling is not supported in this VM.\n");
3013       return JNI_ERR;
3014 #endif // INCLUDE_FPROF
3015     // -Xconcurrentio
3016     } else if (match_option(option, "-Xconcurrentio", &tail)) {
3017       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3018       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3019       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3020       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3021       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
3022 
3023       // -Xinternalversion
3024     } else if (match_option(option, "-Xinternalversion", &tail)) {
3025       jio_fprintf(defaultStream::output_stream(), "%s\n",
3026                   VM_Version::internal_vm_info_string());
3027       vm_exit(0);
3028 #ifndef PRODUCT
3029     // -Xprintflags
3030     } else if (match_option(option, "-Xprintflags", &tail)) {
3031       CommandLineFlags::printFlags(tty, false);
3032       vm_exit(0);
3033 #endif
3034     // -D
3035     } else if (match_option(option, "-D", &tail)) {
3036       if (!add_property(tail)) {
3037         return JNI_ENOMEM;
3038       }
3039       // Out of the box management support
3040       if (match_option(option, "-Dcom.sun.management", &tail)) {
3041 #if INCLUDE_MANAGEMENT
3042         FLAG_SET_CMDLINE(bool, ManagementServer, true);
3043 #else
3044         jio_fprintf(defaultStream::output_stream(),
3045           "-Dcom.sun.management is not supported in this VM.\n");
3046         return JNI_ERR;
3047 #endif
3048       }
3049     // -Xint
3050     } else if (match_option(option, "-Xint", &tail)) {
3051           set_mode_flags(_int);
3052     // -Xmixed
3053     } else if (match_option(option, "-Xmixed", &tail)) {
3054           set_mode_flags(_mixed);
3055     // -Xcomp
3056     } else if (match_option(option, "-Xcomp", &tail)) {
3057       // for testing the compiler; turn off all flags that inhibit compilation
3058           set_mode_flags(_comp);
3059     // -Xshare:dump
3060     } else if (match_option(option, "-Xshare:dump", &tail)) {
3061       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3062       set_mode_flags(_int);     // Prevent compilation, which creates objects
3063     // -Xshare:on
3064     } else if (match_option(option, "-Xshare:on", &tail)) {
3065       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3066       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3067     // -Xshare:auto
3068     } else if (match_option(option, "-Xshare:auto", &tail)) {
3069       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3070       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3071     // -Xshare:off
3072     } else if (match_option(option, "-Xshare:off", &tail)) {
3073       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3074       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3075     // -Xverify
3076     } else if (match_option(option, "-Xverify", &tail)) {
3077       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3078         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3079         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3080       } else if (strcmp(tail, ":remote") == 0) {
3081         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3082         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3083       } else if (strcmp(tail, ":none") == 0) {
3084         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3085         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3086       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3087         return JNI_EINVAL;
3088       }
3089     // -Xdebug
3090     } else if (match_option(option, "-Xdebug", &tail)) {
3091       // note this flag has been used, then ignore
3092       set_xdebug_mode(true);
3093     // -Xnoagent
3094     } else if (match_option(option, "-Xnoagent", &tail)) {
3095       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3096     } else if (match_option(option, "-Xboundthreads", &tail)) {
3097       // Bind user level threads to kernel threads (Solaris only)
3098       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3099     } else if (match_option(option, "-Xloggc:", &tail)) {
3100       // Redirect GC output to the file. -Xloggc:<filename>
3101       // ostream_init_log(), when called will use this filename
3102       // to initialize a fileStream.
3103       _gc_log_filename = os::strdup_check_oom(tail);
3104      if (!is_filename_valid(_gc_log_filename)) {
3105        jio_fprintf(defaultStream::output_stream(),
3106                   "Invalid file name for use with -Xloggc: Filename can only contain the "
3107                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3108                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
3109         return JNI_EINVAL;
3110       }
3111       FLAG_SET_CMDLINE(bool, PrintGC, true);
3112       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3113 
3114     // JNI hooks
3115     } else if (match_option(option, "-Xcheck", &tail)) {
3116       if (!strcmp(tail, ":jni")) {
3117 #if !INCLUDE_JNI_CHECK
3118         warning("JNI CHECKING is not supported in this VM");
3119 #else
3120         CheckJNICalls = true;
3121 #endif // INCLUDE_JNI_CHECK
3122       } else if (is_bad_option(option, args->ignoreUnrecognized,
3123                                      "check")) {
3124         return JNI_EINVAL;
3125       }
3126     } else if (match_option(option, "vfprintf", &tail)) {
3127       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3128     } else if (match_option(option, "exit", &tail)) {
3129       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3130     } else if (match_option(option, "abort", &tail)) {
3131       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3132     // -XX:+AggressiveHeap
3133     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3134 
3135       // This option inspects the machine and attempts to set various
3136       // parameters to be optimal for long-running, memory allocation
3137       // intensive jobs.  It is intended for machines with large
3138       // amounts of cpu and memory.
3139 
3140       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3141       // VM, but we may not be able to represent the total physical memory
3142       // available (like having 8gb of memory on a box but using a 32bit VM).
3143       // Thus, we need to make sure we're using a julong for intermediate
3144       // calculations.
3145       julong initHeapSize;
3146       julong total_memory = os::physical_memory();
3147 
3148       if (total_memory < (julong)256*M) {
3149         jio_fprintf(defaultStream::error_stream(),
3150                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3151         vm_exit(1);
3152       }
3153 
3154       // The heap size is half of available memory, or (at most)
3155       // all of possible memory less 160mb (leaving room for the OS
3156       // when using ISM).  This is the maximum; because adaptive sizing
3157       // is turned on below, the actual space used may be smaller.
3158 
3159       initHeapSize = MIN2(total_memory / (julong)2,
3160                           total_memory - (julong)160*M);
3161 
3162       initHeapSize = limit_by_allocatable_memory(initHeapSize);
3163 
3164       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3165          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3166          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3167          // Currently the minimum size and the initial heap sizes are the same.
3168          set_min_heap_size(initHeapSize);
3169       }
3170       if (FLAG_IS_DEFAULT(NewSize)) {
3171          // Make the young generation 3/8ths of the total heap.
3172          FLAG_SET_CMDLINE(uintx, NewSize,
3173                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3174          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3175       }
3176 
3177 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3178       FLAG_SET_DEFAULT(UseLargePages, true);
3179 #endif
3180 
3181       // Increase some data structure sizes for efficiency
3182       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3183       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3184       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3185 
3186       // See the OldPLABSize comment below, but replace 'after promotion'
3187       // with 'after copying'.  YoungPLABSize is the size of the survivor
3188       // space per-gc-thread buffers.  The default is 4kw.
3189       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
3190 
3191       // OldPLABSize is the size of the buffers in the old gen that
3192       // UseParallelGC uses to promote live data that doesn't fit in the
3193       // survivor spaces.  At any given time, there's one for each gc thread.
3194       // The default size is 1kw. These buffers are rarely used, since the
3195       // survivor spaces are usually big enough.  For specjbb, however, there
3196       // are occasions when there's lots of live data in the young gen
3197       // and we end up promoting some of it.  We don't have a definite
3198       // explanation for why bumping OldPLABSize helps, but the theory
3199       // is that a bigger PLAB results in retaining something like the
3200       // original allocation order after promotion, which improves mutator
3201       // locality.  A minor effect may be that larger PLABs reduce the
3202       // number of PLAB allocation events during gc.  The value of 8kw
3203       // was arrived at by experimenting with specjbb.
3204       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
3205 
3206       // Enable parallel GC and adaptive generation sizing
3207       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3208       FLAG_SET_DEFAULT(ParallelGCThreads,
3209                        Abstract_VM_Version::parallel_worker_threads());
3210 
3211       // Encourage steady state memory management
3212       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3213 
3214       // This appears to improve mutator locality
3215       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3216 
3217       // Get around early Solaris scheduling bug
3218       // (affinity vs other jobs on system)
3219       // but disallow DR and offlining (5008695).
3220       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3221 
3222     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3223     // and the last option wins.
3224     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3225       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3226       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3227       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3228     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3229       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3230       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3231       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3232     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3233       uintx max_tenuring_thresh = 0;
3234       if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3235         jio_fprintf(defaultStream::error_stream(),
3236                     "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3237       }
3238       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3239 
3240       if (MaxTenuringThreshold == 0) {
3241         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3242         FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3243       } else {
3244         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3245         FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3246       }
3247     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3248                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3249       jio_fprintf(defaultStream::error_stream(),
3250         "Please use CMSClassUnloadingEnabled in place of "
3251         "CMSPermGenSweepingEnabled in the future\n");
3252     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3253       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3254       jio_fprintf(defaultStream::error_stream(),
3255         "Please use -XX:+UseGCOverheadLimit in place of "
3256         "-XX:+UseGCTimeLimit in the future\n");
3257     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3258       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3259       jio_fprintf(defaultStream::error_stream(),
3260         "Please use -XX:-UseGCOverheadLimit in place of "
3261         "-XX:-UseGCTimeLimit in the future\n");
3262     // The TLE options are for compatibility with 1.3 and will be
3263     // removed without notice in a future release.  These options
3264     // are not to be documented.
3265     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3266       // No longer used.
3267     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3268       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3269     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3270       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3271     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3272       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3273     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3274       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3275     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3276       // No longer used.
3277     } else if (match_option(option, "-XX:TLESize=", &tail)) {
3278       julong long_tlab_size = 0;
3279       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3280       if (errcode != arg_in_range) {
3281         jio_fprintf(defaultStream::error_stream(),
3282                     "Invalid TLAB size: %s\n", option->optionString);
3283         describe_range_error(errcode);
3284         return JNI_EINVAL;
3285       }
3286       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3287     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3288       // No longer used.
3289     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3290       FLAG_SET_CMDLINE(bool, UseTLAB, true);
3291     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3292       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3293     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3294       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3295       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3296     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3297       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3298       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3299     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3300 #if defined(DTRACE_ENABLED)
3301       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3302       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3303       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3304       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3305 #else // defined(DTRACE_ENABLED)
3306       jio_fprintf(defaultStream::error_stream(),
3307                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3308       return JNI_EINVAL;
3309 #endif // defined(DTRACE_ENABLED)
3310 #ifdef ASSERT
3311     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3312       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3313       // disable scavenge before parallel mark-compact
3314       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3315 #endif
3316     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3317       julong cms_blocks_to_claim = (julong)atol(tail);
3318       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3319       jio_fprintf(defaultStream::error_stream(),
3320         "Please use -XX:OldPLABSize in place of "
3321         "-XX:CMSParPromoteBlocksToClaim in the future\n");
3322     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3323       julong cms_blocks_to_claim = (julong)atol(tail);
3324       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3325       jio_fprintf(defaultStream::error_stream(),
3326         "Please use -XX:OldPLABSize in place of "
3327         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3328     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3329       julong old_plab_size = 0;
3330       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3331       if (errcode != arg_in_range) {
3332         jio_fprintf(defaultStream::error_stream(),
3333                     "Invalid old PLAB size: %s\n", option->optionString);
3334         describe_range_error(errcode);
3335         return JNI_EINVAL;
3336       }
3337       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3338       jio_fprintf(defaultStream::error_stream(),
3339                   "Please use -XX:OldPLABSize in place of "
3340                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3341     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3342       julong young_plab_size = 0;
3343       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3344       if (errcode != arg_in_range) {
3345         jio_fprintf(defaultStream::error_stream(),
3346                     "Invalid young PLAB size: %s\n", option->optionString);
3347         describe_range_error(errcode);
3348         return JNI_EINVAL;
3349       }
3350       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3351       jio_fprintf(defaultStream::error_stream(),
3352                   "Please use -XX:YoungPLABSize in place of "
3353                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3354     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3355                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3356       julong stack_size = 0;
3357       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3358       if (errcode != arg_in_range) {
3359         jio_fprintf(defaultStream::error_stream(),
3360                     "Invalid mark stack size: %s\n", option->optionString);
3361         describe_range_error(errcode);
3362         return JNI_EINVAL;
3363       }
3364       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3365     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3366       julong max_stack_size = 0;
3367       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3368       if (errcode != arg_in_range) {
3369         jio_fprintf(defaultStream::error_stream(),
3370                     "Invalid maximum mark stack size: %s\n",
3371                     option->optionString);
3372         describe_range_error(errcode);
3373         return JNI_EINVAL;
3374       }
3375       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3376     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3377                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3378       uintx conc_threads = 0;
3379       if (!parse_uintx(tail, &conc_threads, 1)) {
3380         jio_fprintf(defaultStream::error_stream(),
3381                     "Invalid concurrent threads: %s\n", option->optionString);
3382         return JNI_EINVAL;
3383       }
3384       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3385     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3386       julong max_direct_memory_size = 0;
3387       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3388       if (errcode != arg_in_range) {
3389         jio_fprintf(defaultStream::error_stream(),
3390                     "Invalid maximum direct memory size: %s\n",
3391                     option->optionString);
3392         describe_range_error(errcode);
3393         return JNI_EINVAL;
3394       }
3395       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3396 #if !INCLUDE_MANAGEMENT
3397     } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3398         jio_fprintf(defaultStream::error_stream(),
3399           "ManagementServer is not supported in this VM.\n");
3400         return JNI_ERR;
3401 #endif // INCLUDE_MANAGEMENT
3402     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3403       // Skip -XX:Flags= since that case has already been handled
3404       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3405         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3406           return JNI_EINVAL;
3407         }
3408       }
3409     // Unknown option
3410     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3411       return JNI_ERR;
3412     }
3413   }
3414 
3415   // PrintSharedArchiveAndExit will turn on
3416   //   -Xshare:on
3417   //   -XX:+TraceClassPaths
3418   if (PrintSharedArchiveAndExit) {
3419     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3420     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3421     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3422   }
3423 
3424   // Change the default value for flags  which have different default values
3425   // when working with older JDKs.
3426 #ifdef LINUX
3427  if (JDK_Version::current().compare_major(6) <= 0 &&
3428       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3429     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3430   }
3431 #endif // LINUX
3432   fix_appclasspath();
3433   return JNI_OK;
3434 }
3435 
3436 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3437 //
3438 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3439 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3440 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3441 // path is treated as the current directory.
3442 //
3443 // This causes problems with CDS, which requires that all directories specified in the classpath
3444 // must be empty. In most cases, applications do NOT want to load classes from the current
3445 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3446 // scripts compatible with CDS.
3447 void Arguments::fix_appclasspath() {
3448   if (IgnoreEmptyClassPaths) {
3449     const char separator = *os::path_separator();
3450     const char* src = _java_class_path->value();
3451 
3452     // skip over all the leading empty paths
3453     while (*src == separator) {
3454       src ++;
3455     }
3456 
3457     char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3458     strncpy(copy, src, strlen(src) + 1);
3459 
3460     // trim all trailing empty paths
3461     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3462       *tail = '\0';
3463     }
3464 
3465     char from[3] = {separator, separator, '\0'};
3466     char to  [2] = {separator, '\0'};
3467     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3468       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3469       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3470     }
3471 
3472     _java_class_path->set_value(copy);
3473     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3474   }
3475 
3476   if (!PrintSharedArchiveAndExit) {
3477     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3478   }
3479 }
3480 
3481 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3482   // This must be done after all -D arguments have been processed.
3483   scp_p->expand_endorsed();
3484 
3485   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3486     // Assemble the bootclasspath elements into the final path.
3487     Arguments::set_sysclasspath(scp_p->combined_path());
3488   }
3489 
3490   // This must be done after all arguments have been processed.
3491   // java_compiler() true means set to "NONE" or empty.
3492   if (java_compiler() && !xdebug_mode()) {
3493     // For backwards compatibility, we switch to interpreted mode if
3494     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3495     // not specified.
3496     set_mode_flags(_int);
3497   }
3498   if (CompileThreshold == 0) {
3499     set_mode_flags(_int);
3500   }
3501 
3502   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3503   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3504     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3505   }
3506 
3507 #ifndef COMPILER2
3508   // Don't degrade server performance for footprint
3509   if (FLAG_IS_DEFAULT(UseLargePages) &&
3510       MaxHeapSize < LargePageHeapSizeThreshold) {
3511     // No need for large granularity pages w/small heaps.
3512     // Note that large pages are enabled/disabled for both the
3513     // Java heap and the code cache.
3514     FLAG_SET_DEFAULT(UseLargePages, false);
3515   }
3516 
3517 #else
3518   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3519     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3520   }
3521 #endif
3522 
3523 #ifndef TIERED
3524   // Tiered compilation is undefined.
3525   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3526 #endif
3527 
3528   // If we are running in a headless jre, force java.awt.headless property
3529   // to be true unless the property has already been set.
3530   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3531   if (os::is_headless_jre()) {
3532     const char* headless = Arguments::get_property("java.awt.headless");
3533     if (headless == NULL) {
3534       char envbuffer[128];
3535       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3536         if (!add_property("java.awt.headless=true")) {
3537           return JNI_ENOMEM;
3538         }
3539       } else {
3540         char buffer[256];
3541         strcpy(buffer, "java.awt.headless=");
3542         strcat(buffer, envbuffer);
3543         if (!add_property(buffer)) {
3544           return JNI_ENOMEM;
3545         }
3546       }
3547     }
3548   }
3549 
3550   if (!ArgumentsExt::check_vm_args_consistency()) {
3551     return JNI_ERR;
3552   }
3553 
3554   return JNI_OK;
3555 }
3556 
3557 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3558   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3559                                             scp_assembly_required_p);
3560 }
3561 
3562 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3563   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3564                                             scp_assembly_required_p);
3565 }
3566 
3567 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3568   const int N_MAX_OPTIONS = 64;
3569   const int OPTION_BUFFER_SIZE = 1024;
3570   char buffer[OPTION_BUFFER_SIZE];
3571 
3572   // The variable will be ignored if it exceeds the length of the buffer.
3573   // Don't check this variable if user has special privileges
3574   // (e.g. unix su command).
3575   if (os::getenv(name, buffer, sizeof(buffer)) &&
3576       !os::have_special_privileges()) {
3577     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3578     jio_fprintf(defaultStream::error_stream(),
3579                 "Picked up %s: %s\n", name, buffer);
3580     char* rd = buffer;                        // pointer to the input string (rd)
3581     int i;
3582     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3583       while (isspace(*rd)) rd++;              // skip whitespace
3584       if (*rd == 0) break;                    // we re done when the input string is read completely
3585 
3586       // The output, option string, overwrites the input string.
3587       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3588       // input string (rd).
3589       char* wrt = rd;
3590 
3591       options[i++].optionString = wrt;        // Fill in option
3592       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3593         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3594           int quote = *rd;                    // matching quote to look for
3595           rd++;                               // don't copy open quote
3596           while (*rd != quote) {              // include everything (even spaces) up until quote
3597             if (*rd == 0) {                   // string termination means unmatched string
3598               jio_fprintf(defaultStream::error_stream(),
3599                           "Unmatched quote in %s\n", name);
3600               return JNI_ERR;
3601             }
3602             *wrt++ = *rd++;                   // copy to option string
3603           }
3604           rd++;                               // don't copy close quote
3605         } else {
3606           *wrt++ = *rd++;                     // copy to option string
3607         }
3608       }
3609       // Need to check if we're done before writing a NULL,
3610       // because the write could be to the byte that rd is pointing to.
3611       if (*rd++ == 0) {
3612         *wrt = 0;
3613         break;
3614       }
3615       *wrt = 0;                               // Zero terminate option
3616     }
3617     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3618     JavaVMInitArgs vm_args;
3619     vm_args.version = JNI_VERSION_1_2;
3620     vm_args.options = options;
3621     vm_args.nOptions = i;
3622     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3623 
3624     if (PrintVMOptions) {
3625       const char* tail;
3626       for (int i = 0; i < vm_args.nOptions; i++) {
3627         const JavaVMOption *option = vm_args.options + i;
3628         if (match_option(option, "-XX:", &tail)) {
3629           logOption(tail);
3630         }
3631       }
3632     }
3633 
3634     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3635   }
3636   return JNI_OK;
3637 }
3638 
3639 void Arguments::set_shared_spaces_flags() {
3640   if (DumpSharedSpaces) {
3641     if (RequireSharedSpaces) {
3642       warning("cannot dump shared archive while using shared archive");
3643     }
3644     UseSharedSpaces = false;
3645 #ifdef _LP64
3646     if (!UseCompressedOops || !UseCompressedClassPointers) {
3647       vm_exit_during_initialization(
3648         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3649     }
3650   } else {
3651     if (!UseCompressedOops || !UseCompressedClassPointers) {
3652       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3653     }
3654 #endif
3655   }
3656 }
3657 
3658 #if !INCLUDE_ALL_GCS
3659 static void force_serial_gc() {
3660   FLAG_SET_DEFAULT(UseSerialGC, true);
3661   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
3662   UNSUPPORTED_GC_OPTION(UseG1GC);
3663   UNSUPPORTED_GC_OPTION(UseParallelGC);
3664   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3665   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3666   UNSUPPORTED_GC_OPTION(UseParNewGC);
3667 }
3668 #endif // INCLUDE_ALL_GCS
3669 
3670 // Sharing support
3671 // Construct the path to the archive
3672 static char* get_shared_archive_path() {
3673   char *shared_archive_path;
3674   if (SharedArchiveFile == NULL) {
3675     char jvm_path[JVM_MAXPATHLEN];
3676     os::jvm_path(jvm_path, sizeof(jvm_path));
3677     char *end = strrchr(jvm_path, *os::file_separator());
3678     if (end != NULL) *end = '\0';
3679     size_t jvm_path_len = strlen(jvm_path);
3680     size_t file_sep_len = strlen(os::file_separator());
3681     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3682         file_sep_len + 20, mtInternal);
3683     if (shared_archive_path != NULL) {
3684       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3685       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3686       strncat(shared_archive_path, "classes.jsa", 11);
3687     }
3688   } else {
3689     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3690     if (shared_archive_path != NULL) {
3691       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3692     }
3693   }
3694   return shared_archive_path;
3695 }
3696 
3697 #ifndef PRODUCT
3698 // Determine whether LogVMOutput should be implicitly turned on.
3699 static bool use_vm_log() {
3700   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3701       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3702       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3703       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3704       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3705     return true;
3706   }
3707 
3708 #ifdef COMPILER1
3709   if (PrintC1Statistics) {
3710     return true;
3711   }
3712 #endif // COMPILER1
3713 
3714 #ifdef COMPILER2
3715   if (PrintOptoAssembly || PrintOptoStatistics) {
3716     return true;
3717   }
3718 #endif // COMPILER2
3719 
3720   return false;
3721 }
3722 #endif // PRODUCT
3723 
3724 // Parse entry point called from JNI_CreateJavaVM
3725 
3726 jint Arguments::parse(const JavaVMInitArgs* args) {
3727 
3728   // Remaining part of option string
3729   const char* tail;
3730 
3731   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3732   const char* hotspotrc = ".hotspotrc";
3733   bool settings_file_specified = false;
3734   bool needs_hotspotrc_warning = false;
3735 
3736   const char* flags_file;
3737   int index;
3738   for (index = 0; index < args->nOptions; index++) {
3739     const JavaVMOption *option = args->options + index;
3740     if (match_option(option, "-XX:Flags=", &tail)) {
3741       flags_file = tail;
3742       settings_file_specified = true;
3743     }
3744     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3745       PrintVMOptions = true;
3746     }
3747     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3748       PrintVMOptions = false;
3749     }
3750     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3751       IgnoreUnrecognizedVMOptions = true;
3752     }
3753     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3754       IgnoreUnrecognizedVMOptions = false;
3755     }
3756     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3757       CommandLineFlags::printFlags(tty, false);
3758       vm_exit(0);
3759     }
3760 #if INCLUDE_NMT
3761     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3762       // The launcher did not setup nmt environment variable properly.
3763       if (!MemTracker::check_launcher_nmt_support(tail)) {
3764         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3765       }
3766 
3767       // Verify if nmt option is valid.
3768       if (MemTracker::verify_nmt_option()) {
3769         // Late initialization, still in single-threaded mode.
3770         if (MemTracker::tracking_level() >= NMT_summary) {
3771           MemTracker::init();
3772         }
3773       } else {
3774         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3775       }
3776     }
3777 #endif
3778 
3779 
3780 #ifndef PRODUCT
3781     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3782       CommandLineFlags::printFlags(tty, true);
3783       vm_exit(0);
3784     }
3785 #endif
3786   }
3787 
3788   if (IgnoreUnrecognizedVMOptions) {
3789     // uncast const to modify the flag args->ignoreUnrecognized
3790     *(jboolean*)(&args->ignoreUnrecognized) = true;
3791   }
3792 
3793   // Parse specified settings file
3794   if (settings_file_specified) {
3795     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3796       return JNI_EINVAL;
3797     }
3798   } else {
3799 #ifdef ASSERT
3800     // Parse default .hotspotrc settings file
3801     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3802       return JNI_EINVAL;
3803     }
3804 #else
3805     struct stat buf;
3806     if (os::stat(hotspotrc, &buf) == 0) {
3807       needs_hotspotrc_warning = true;
3808     }
3809 #endif
3810   }
3811 
3812   if (PrintVMOptions) {
3813     for (index = 0; index < args->nOptions; index++) {
3814       const JavaVMOption *option = args->options + index;
3815       if (match_option(option, "-XX:", &tail)) {
3816         logOption(tail);
3817       }
3818     }
3819   }
3820 
3821   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3822   jint result = parse_vm_init_args(args);
3823   if (result != JNI_OK) {
3824     return result;
3825   }
3826 
3827   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3828   SharedArchivePath = get_shared_archive_path();
3829   if (SharedArchivePath == NULL) {
3830     return JNI_ENOMEM;
3831   }
3832 
3833   // Delay warning until here so that we've had a chance to process
3834   // the -XX:-PrintWarnings flag
3835   if (needs_hotspotrc_warning) {
3836     warning("%s file is present but has been ignored.  "
3837             "Run with -XX:Flags=%s to load the file.",
3838             hotspotrc, hotspotrc);
3839   }
3840 
3841 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3842   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3843 #endif
3844 
3845 #if INCLUDE_ALL_GCS
3846   #if (defined JAVASE_EMBEDDED || defined ARM)
3847     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3848   #endif
3849 #endif
3850 
3851 #ifndef PRODUCT
3852   if (TraceBytecodesAt != 0) {
3853     TraceBytecodes = true;
3854   }
3855   if (CountCompiledCalls) {
3856     if (UseCounterDecay) {
3857       warning("UseCounterDecay disabled because CountCalls is set");
3858       UseCounterDecay = false;
3859     }
3860   }
3861 #endif // PRODUCT
3862 
3863   if (ScavengeRootsInCode == 0) {
3864     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3865       warning("forcing ScavengeRootsInCode non-zero");
3866     }
3867     ScavengeRootsInCode = 1;
3868   }
3869 
3870   if (PrintGCDetails) {
3871     // Turn on -verbose:gc options as well
3872     PrintGC = true;
3873   }
3874 
3875   // Set object alignment values.
3876   set_object_alignment();
3877 
3878 #if !INCLUDE_ALL_GCS
3879   force_serial_gc();
3880 #endif // INCLUDE_ALL_GCS
3881 #if !INCLUDE_CDS
3882   if (DumpSharedSpaces || RequireSharedSpaces) {
3883     jio_fprintf(defaultStream::error_stream(),
3884       "Shared spaces are not supported in this VM\n");
3885     return JNI_ERR;
3886   }
3887   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3888     warning("Shared spaces are not supported in this VM");
3889     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3890     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3891   }
3892   no_shared_spaces("CDS Disabled");
3893 #endif // INCLUDE_CDS
3894 
3895   return JNI_OK;
3896 }
3897 
3898 jint Arguments::apply_ergo() {
3899 
3900   // Set flags based on ergonomics.
3901   set_ergonomics_flags();
3902 
3903   set_shared_spaces_flags();
3904 
3905   // Check the GC selections again.
3906   if (!ArgumentsExt::check_gc_consistency_ergo()) {
3907     return JNI_EINVAL;
3908   }
3909 
3910   if (TieredCompilation) {
3911     set_tiered_flags();
3912   } else {
3913     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3914     if (CompilationPolicyChoice >= 2) {
3915       vm_exit_during_initialization(
3916         "Incompatible compilation policy selected", NULL);
3917     }
3918   }
3919 
3920   // Set heap size based on available physical memory
3921   set_heap_size();
3922 
3923   set_gc_specific_flags();
3924 
3925   // Initialize Metaspace flags and alignments
3926   Metaspace::ergo_initialize();
3927 
3928   // Set bytecode rewriting flags
3929   set_bytecode_flags();
3930 
3931   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3932   set_aggressive_opts_flags();
3933 
3934   // Turn off biased locking for locking debug mode flags,
3935   // which are subtly different from each other but neither works with
3936   // biased locking
3937   if (UseHeavyMonitors
3938 #ifdef COMPILER1
3939       || !UseFastLocking
3940 #endif // COMPILER1
3941     ) {
3942     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3943       // flag set to true on command line; warn the user that they
3944       // can't enable biased locking here
3945       warning("Biased Locking is not supported with locking debug flags"
3946               "; ignoring UseBiasedLocking flag." );
3947     }
3948     UseBiasedLocking = false;
3949   }
3950 
3951 #ifdef ZERO
3952   // Clear flags not supported on zero.
3953   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3954   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3955   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3956   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3957 #endif // CC_INTERP
3958 
3959 #ifdef COMPILER2
3960   if (!EliminateLocks) {
3961     EliminateNestedLocks = false;
3962   }
3963   if (!Inline) {
3964     IncrementalInline = false;
3965   }
3966 #ifndef PRODUCT
3967   if (!IncrementalInline) {
3968     AlwaysIncrementalInline = false;
3969   }
3970 #endif
3971   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3972     // nothing to use the profiling, turn if off
3973     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3974   }
3975 #endif
3976 
3977   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3978     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3979     DebugNonSafepoints = true;
3980   }
3981 
3982   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3983     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3984   }
3985 
3986 #ifndef PRODUCT
3987   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3988     if (use_vm_log()) {
3989       LogVMOutput = true;
3990     }
3991   }
3992 #endif // PRODUCT
3993 
3994   if (PrintCommandLineFlags) {
3995     CommandLineFlags::printSetFlags(tty);
3996   }
3997 
3998   // Apply CPU specific policy for the BiasedLocking
3999   if (UseBiasedLocking) {
4000     if (!VM_Version::use_biased_locking() &&
4001         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4002       UseBiasedLocking = false;
4003     }
4004   }
4005 #ifdef COMPILER2
4006   if (!UseBiasedLocking || EmitSync != 0) {
4007     UseOptoBiasInlining = false;
4008   }
4009 #endif
4010 
4011   return JNI_OK;
4012 }
4013 
4014 jint Arguments::adjust_after_os() {
4015   if (UseNUMA) {
4016     if (UseParallelGC || UseParallelOldGC) {
4017       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4018          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4019       }
4020     }
4021     // UseNUMAInterleaving is set to ON for all collectors and
4022     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4023     // such as the parallel collector for Linux and Solaris will
4024     // interleave old gen and survivor spaces on top of NUMA
4025     // allocation policy for the eden space.
4026     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4027     // all platforms and ParallelGC on Windows will interleave all
4028     // of the heap spaces across NUMA nodes.
4029     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4030       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4031     }
4032   }
4033   return JNI_OK;
4034 }
4035 
4036 int Arguments::PropertyList_count(SystemProperty* pl) {
4037   int count = 0;
4038   while(pl != NULL) {
4039     count++;
4040     pl = pl->next();
4041   }
4042   return count;
4043 }
4044 
4045 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4046   assert(key != NULL, "just checking");
4047   SystemProperty* prop;
4048   for (prop = pl; prop != NULL; prop = prop->next()) {
4049     if (strcmp(key, prop->key()) == 0) return prop->value();
4050   }
4051   return NULL;
4052 }
4053 
4054 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4055   int count = 0;
4056   const char* ret_val = NULL;
4057 
4058   while(pl != NULL) {
4059     if(count >= index) {
4060       ret_val = pl->key();
4061       break;
4062     }
4063     count++;
4064     pl = pl->next();
4065   }
4066 
4067   return ret_val;
4068 }
4069 
4070 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4071   int count = 0;
4072   char* ret_val = NULL;
4073 
4074   while(pl != NULL) {
4075     if(count >= index) {
4076       ret_val = pl->value();
4077       break;
4078     }
4079     count++;
4080     pl = pl->next();
4081   }
4082 
4083   return ret_val;
4084 }
4085 
4086 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4087   SystemProperty* p = *plist;
4088   if (p == NULL) {
4089     *plist = new_p;
4090   } else {
4091     while (p->next() != NULL) {
4092       p = p->next();
4093     }
4094     p->set_next(new_p);
4095   }
4096 }
4097 
4098 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4099   if (plist == NULL)
4100     return;
4101 
4102   SystemProperty* new_p = new SystemProperty(k, v, true);
4103   PropertyList_add(plist, new_p);
4104 }
4105 
4106 // This add maintains unique property key in the list.
4107 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4108   if (plist == NULL)
4109     return;
4110 
4111   // If property key exist then update with new value.
4112   SystemProperty* prop;
4113   for (prop = *plist; prop != NULL; prop = prop->next()) {
4114     if (strcmp(k, prop->key()) == 0) {
4115       if (append) {
4116         prop->append_value(v);
4117       } else {
4118         prop->set_value(v);
4119       }
4120       return;
4121     }
4122   }
4123 
4124   PropertyList_add(plist, k, v);
4125 }
4126 
4127 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4128 // Returns true if all of the source pointed by src has been copied over to
4129 // the destination buffer pointed by buf. Otherwise, returns false.
4130 // Notes:
4131 // 1. If the length (buflen) of the destination buffer excluding the
4132 // NULL terminator character is not long enough for holding the expanded
4133 // pid characters, it also returns false instead of returning the partially
4134 // expanded one.
4135 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4136 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4137                                 char* buf, size_t buflen) {
4138   const char* p = src;
4139   char* b = buf;
4140   const char* src_end = &src[srclen];
4141   char* buf_end = &buf[buflen - 1];
4142 
4143   while (p < src_end && b < buf_end) {
4144     if (*p == '%') {
4145       switch (*(++p)) {
4146       case '%':         // "%%" ==> "%"
4147         *b++ = *p++;
4148         break;
4149       case 'p':  {       //  "%p" ==> current process id
4150         // buf_end points to the character before the last character so
4151         // that we could write '\0' to the end of the buffer.
4152         size_t buf_sz = buf_end - b + 1;
4153         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4154 
4155         // if jio_snprintf fails or the buffer is not long enough to hold
4156         // the expanded pid, returns false.
4157         if (ret < 0 || ret >= (int)buf_sz) {
4158           return false;
4159         } else {
4160           b += ret;
4161           assert(*b == '\0', "fail in copy_expand_pid");
4162           if (p == src_end && b == buf_end + 1) {
4163             // reach the end of the buffer.
4164             return true;
4165           }
4166         }
4167         p++;
4168         break;
4169       }
4170       default :
4171         *b++ = '%';
4172       }
4173     } else {
4174       *b++ = *p++;
4175     }
4176   }
4177   *b = '\0';
4178   return (p == src_end); // return false if not all of the source was copied
4179 }