1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classLoader.hpp"
  27 #include "classfile/javaAssertions.hpp"
  28 #include "classfile/stringTable.hpp"
  29 #include "classfile/symbolTable.hpp"
  30 #include "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.java.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::_sun_boot_library_path = NULL;
 119 SystemProperty *Arguments::_java_library_path = NULL;
 120 SystemProperty *Arguments::_java_home = NULL;
 121 SystemProperty *Arguments::_java_class_path = NULL;
 122 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 123 
 124 char* Arguments::_meta_index_path = NULL;
 125 char* Arguments::_meta_index_dir = NULL;
 126 char* Arguments::_ext_dirs = NULL;
 127 
 128 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 129 // part of the option string.
 130 static bool match_option(const JavaVMOption *option, const char* name,
 131                          const char** tail) {
 132   int len = (int)strlen(name);
 133   if (strncmp(option->optionString, name, len) == 0) {
 134     *tail = option->optionString + len;
 135     return true;
 136   } else {
 137     return false;
 138   }
 139 }
 140 
 141 // Check if 'option' matches 'name'. No "tail" is allowed.
 142 static bool match_option(const JavaVMOption *option, const char* name) {
 143   const char* tail = NULL;
 144   bool result = match_option(option, name, &tail);
 145   if (tail != NULL && *tail == '\0') {
 146     return result;
 147   } else {
 148     return false;
 149   }
 150 }
 151 
 152 // Return true if any of the strings in null-terminated array 'names' matches.
 153 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 154 // the option must match exactly.
 155 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 156   bool tail_allowed) {
 157   for (/* empty */; *names != NULL; ++names) {
 158     if (match_option(option, *names, tail)) {
 159       if (**tail == '\0' || tail_allowed && **tail == ':') {
 160         return true;
 161       }
 162     }
 163   }
 164   return false;
 165 }
 166 
 167 static void logOption(const char* opt) {
 168   if (PrintVMOptions) {
 169     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 170   }
 171 }
 172 
 173 // Process java launcher properties.
 174 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 175   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 176   // sun.java.launcher.pid is defined.
 177   // Must do this before setting up other system properties,
 178   // as some of them may depend on launcher type.
 179   for (int index = 0; index < args->nOptions; index++) {
 180     const JavaVMOption* option = args->options + index;
 181     const char* tail;
 182 
 183     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 184       process_java_launcher_argument(tail, option->extraInfo);
 185       continue;
 186     }
 187     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 188       if (strcmp(tail, "true") == 0) {
 189         _sun_java_launcher_is_altjvm = true;
 190       }
 191       continue;
 192     }
 193     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 194       _sun_java_launcher_pid = atoi(tail);
 195       continue;
 196     }
 197   }
 198 }
 199 
 200 // Initialize system properties key and value.
 201 void Arguments::init_system_properties() {
 202 
 203   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 204                                                                  "Java Virtual Machine Specification",  false));
 205   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 206   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 207   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 208 
 209   // Following are JVMTI agent writable properties.
 210   // Properties values are set to NULL and they are
 211   // os specific they are initialized in os::init_system_properties_values().
 212   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 213   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 214   _java_home =  new SystemProperty("java.home", NULL,  true);
 215   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 216 
 217   _java_class_path = new SystemProperty("java.class.path", "",  true);
 218 
 219   // Add to System Property list.
 220   PropertyList_add(&_system_properties, _sun_boot_library_path);
 221   PropertyList_add(&_system_properties, _java_library_path);
 222   PropertyList_add(&_system_properties, _java_home);
 223   PropertyList_add(&_system_properties, _java_class_path);
 224   PropertyList_add(&_system_properties, _sun_boot_class_path);
 225 
 226   // Set OS specific system properties values
 227   os::init_system_properties_values();
 228 }
 229 
 230 
 231   // Update/Initialize System properties after JDK version number is known
 232 void Arguments::init_version_specific_system_properties() {
 233   enum { bufsz = 16 };
 234   char buffer[bufsz];
 235   const char* spec_vendor = "Sun Microsystems Inc.";
 236   uint32_t spec_version = 0;
 237 
 238   spec_vendor = "Oracle Corporation";
 239   spec_version = JDK_Version::current().major_version();
 240   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 241 
 242   PropertyList_add(&_system_properties,
 243       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 244   PropertyList_add(&_system_properties,
 245       new SystemProperty("java.vm.specification.version", buffer, false));
 246   PropertyList_add(&_system_properties,
 247       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 248 }
 249 
 250 /**
 251  * Provide a slightly more user-friendly way of eliminating -XX flags.
 252  * When a flag is eliminated, it can be added to this list in order to
 253  * continue accepting this flag on the command-line, while issuing a warning
 254  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 255  * limit, we flatly refuse to admit the existence of the flag.  This allows
 256  * a flag to die correctly over JDK releases using HSX.
 257  */
 258 typedef struct {
 259   const char* name;
 260   JDK_Version obsoleted_in; // when the flag went away
 261   JDK_Version accept_until; // which version to start denying the existence
 262 } ObsoleteFlag;
 263 
 264 static ObsoleteFlag obsolete_jvm_flags[] = {
 265   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 266   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 267   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 268   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 269   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 270   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 271   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 272   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 273   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 274   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 275   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 276   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 277   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 278   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 279   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 280   { "DefaultInitialRAMFraction",
 281                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 282   { "UseDepthFirstScavengeOrder",
 283                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 284   { "HandlePromotionFailure",
 285                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 286   { "MaxLiveObjectEvacuationRatio",
 287                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 288   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 289   { "UseParallelOldGCCompacting",
 290                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 291   { "UseParallelDensePrefixUpdate",
 292                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 293   { "UseParallelOldGCDensePrefix",
 294                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 295   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 296   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 297   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 298   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 299   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 300   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 301   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 302   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 303   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 304   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 305   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 306   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 307   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 308   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 309   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 310   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 311   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 312   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 313   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 314   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 315   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 316   { "SafepointPollOffset",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 317 #ifdef PRODUCT
 318   { "DesiredMethodLimit",
 319                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 320 #endif // PRODUCT
 321   { "UseVMInterruptibleIO",          JDK_Version::jdk(8), JDK_Version::jdk(9) },
 322   { "UseBoundThreads",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 323   { "DefaultThreadPriority",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 324   { "NoYieldsInMicrolock",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 325   { "BackEdgeThreshold",             JDK_Version::jdk(9), JDK_Version::jdk(10) },
 326   { "UseNewReflection",              JDK_Version::jdk(9), JDK_Version::jdk(10) },
 327   { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
 328   { "VerifyReflectionBytecodes",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 329   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 330   { "NmethodSweepFraction",          JDK_Version::jdk(9), JDK_Version::jdk(10) },
 331   { "NmethodSweepCheckInterval",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 332   { "CodeCacheMinimumFreeSpace",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 333 #ifndef ZERO
 334   { "UseFastAccessorMethods",        JDK_Version::jdk(9), JDK_Version::jdk(10) },
 335   { "UseFastEmptyMethods",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 336 #endif // ZERO
 337   { "UseCompilerSafepoints",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 338   { NULL, JDK_Version(0), JDK_Version(0) }
 339 };
 340 
 341 // Returns true if the flag is obsolete and fits into the range specified
 342 // for being ignored.  In the case that the flag is ignored, the 'version'
 343 // value is filled in with the version number when the flag became
 344 // obsolete so that that value can be displayed to the user.
 345 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 346   int i = 0;
 347   assert(version != NULL, "Must provide a version buffer");
 348   while (obsolete_jvm_flags[i].name != NULL) {
 349     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 350     // <flag>=xxx form
 351     // [-|+]<flag> form
 352     size_t len = strlen(flag_status.name);
 353     if (((strncmp(flag_status.name, s, len) == 0) &&
 354          (strlen(s) == len)) ||
 355         ((s[0] == '+' || s[0] == '-') &&
 356          (strncmp(flag_status.name, &s[1], len) == 0) &&
 357          (strlen(&s[1]) == len))) {
 358       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 359           *version = flag_status.obsoleted_in;
 360           return true;
 361       }
 362     }
 363     i++;
 364   }
 365   return false;
 366 }
 367 
 368 // Constructs the system class path (aka boot class path) from the following
 369 // components, in order:
 370 //
 371 //     prefix           // from -Xbootclasspath/p:...
 372 //     base             // from os::get_system_properties() or -Xbootclasspath=
 373 //     suffix           // from -Xbootclasspath/a:...
 374 //
 375 // This could be AllStatic, but it isn't needed after argument processing is
 376 // complete.
 377 class SysClassPath: public StackObj {
 378 public:
 379   SysClassPath(const char* base);
 380   ~SysClassPath();
 381 
 382   inline void set_base(const char* base);
 383   inline void add_prefix(const char* prefix);
 384   inline void add_suffix_to_prefix(const char* suffix);
 385   inline void add_suffix(const char* suffix);
 386   inline void reset_path(const char* base);
 387 
 388   inline const char* get_base()     const { return _items[_scp_base]; }
 389   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 390   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 391 
 392   // Combine all the components into a single c-heap-allocated string; caller
 393   // must free the string if/when no longer needed.
 394   char* combined_path();
 395 
 396 private:
 397   // Utility routines.
 398   static char* add_to_path(const char* path, const char* str, bool prepend);
 399   static char* add_jars_to_path(char* path, const char* directory);
 400 
 401   inline void reset_item_at(int index);
 402 
 403   // Array indices for the items that make up the sysclasspath.  All except the
 404   // base are allocated in the C heap and freed by this class.
 405   enum {
 406     _scp_prefix,        // from -Xbootclasspath/p:...
 407     _scp_base,          // the default sysclasspath
 408     _scp_suffix,        // from -Xbootclasspath/a:...
 409     _scp_nitems         // the number of items, must be last.
 410   };
 411 
 412   const char* _items[_scp_nitems];
 413 };
 414 
 415 SysClassPath::SysClassPath(const char* base) {
 416   memset(_items, 0, sizeof(_items));
 417   _items[_scp_base] = base;
 418 }
 419 
 420 SysClassPath::~SysClassPath() {
 421   // Free everything except the base.
 422   for (int i = 0; i < _scp_nitems; ++i) {
 423     if (i != _scp_base) reset_item_at(i);
 424   }
 425 }
 426 
 427 inline void SysClassPath::set_base(const char* base) {
 428   _items[_scp_base] = base;
 429 }
 430 
 431 inline void SysClassPath::add_prefix(const char* prefix) {
 432   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 433 }
 434 
 435 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 436   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 437 }
 438 
 439 inline void SysClassPath::add_suffix(const char* suffix) {
 440   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 441 }
 442 
 443 inline void SysClassPath::reset_item_at(int index) {
 444   assert(index < _scp_nitems && index != _scp_base, "just checking");
 445   if (_items[index] != NULL) {
 446     FREE_C_HEAP_ARRAY(char, _items[index]);
 447     _items[index] = NULL;
 448   }
 449 }
 450 
 451 inline void SysClassPath::reset_path(const char* base) {
 452   // Clear the prefix and suffix.
 453   reset_item_at(_scp_prefix);
 454   reset_item_at(_scp_suffix);
 455   set_base(base);
 456 }
 457 
 458 //------------------------------------------------------------------------------
 459 
 460 
 461 // Combine the bootclasspath elements, some of which may be null, into a single
 462 // c-heap-allocated string.
 463 char* SysClassPath::combined_path() {
 464   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 465 
 466   size_t lengths[_scp_nitems];
 467   size_t total_len = 0;
 468 
 469   const char separator = *os::path_separator();
 470 
 471   // Get the lengths.
 472   int i;
 473   for (i = 0; i < _scp_nitems; ++i) {
 474     if (_items[i] != NULL) {
 475       lengths[i] = strlen(_items[i]);
 476       // Include space for the separator char (or a NULL for the last item).
 477       total_len += lengths[i] + 1;
 478     }
 479   }
 480   assert(total_len > 0, "empty sysclasspath not allowed");
 481 
 482   // Copy the _items to a single string.
 483   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 484   char* cp_tmp = cp;
 485   for (i = 0; i < _scp_nitems; ++i) {
 486     if (_items[i] != NULL) {
 487       memcpy(cp_tmp, _items[i], lengths[i]);
 488       cp_tmp += lengths[i];
 489       *cp_tmp++ = separator;
 490     }
 491   }
 492   *--cp_tmp = '\0';     // Replace the extra separator.
 493   return cp;
 494 }
 495 
 496 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 497 char*
 498 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 499   char *cp;
 500 
 501   assert(str != NULL, "just checking");
 502   if (path == NULL) {
 503     size_t len = strlen(str) + 1;
 504     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 505     memcpy(cp, str, len);                       // copy the trailing null
 506   } else {
 507     const char separator = *os::path_separator();
 508     size_t old_len = strlen(path);
 509     size_t str_len = strlen(str);
 510     size_t len = old_len + str_len + 2;
 511 
 512     if (prepend) {
 513       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 514       char* cp_tmp = cp;
 515       memcpy(cp_tmp, str, str_len);
 516       cp_tmp += str_len;
 517       *cp_tmp = separator;
 518       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 519       FREE_C_HEAP_ARRAY(char, path);
 520     } else {
 521       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 522       char* cp_tmp = cp + old_len;
 523       *cp_tmp = separator;
 524       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 525     }
 526   }
 527   return cp;
 528 }
 529 
 530 // Scan the directory and append any jar or zip files found to path.
 531 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 532 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 533   DIR* dir = os::opendir(directory);
 534   if (dir == NULL) return path;
 535 
 536   char dir_sep[2] = { '\0', '\0' };
 537   size_t directory_len = strlen(directory);
 538   const char fileSep = *os::file_separator();
 539   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 540 
 541   /* Scan the directory for jars/zips, appending them to path. */
 542   struct dirent *entry;
 543   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 544   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 545     const char* name = entry->d_name;
 546     const char* ext = name + strlen(name) - 4;
 547     bool isJarOrZip = ext > name &&
 548       (os::file_name_strcmp(ext, ".jar") == 0 ||
 549        os::file_name_strcmp(ext, ".zip") == 0);
 550     if (isJarOrZip) {
 551       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 552       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 553       path = add_to_path(path, jarpath, false);
 554       FREE_C_HEAP_ARRAY(char, jarpath);
 555     }
 556   }
 557   FREE_C_HEAP_ARRAY(char, dbuf);
 558   os::closedir(dir);
 559   return path;
 560 }
 561 
 562 // Parses a memory size specification string.
 563 static bool atomull(const char *s, julong* result) {
 564   julong n = 0;
 565   int args_read = 0;
 566   bool is_hex = false;
 567   // Skip leading 0[xX] for hexadecimal
 568   if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
 569     s += 2;
 570     is_hex = true;
 571     args_read = sscanf(s, JULONG_FORMAT_X, &n);
 572   } else {
 573     args_read = sscanf(s, JULONG_FORMAT, &n);
 574   }
 575   if (args_read != 1) {
 576     return false;
 577   }
 578   while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
 579     s++;
 580   }
 581   // 4705540: illegal if more characters are found after the first non-digit
 582   if (strlen(s) > 1) {
 583     return false;
 584   }
 585   switch (*s) {
 586     case 'T': case 't':
 587       *result = n * G * K;
 588       // Check for overflow.
 589       if (*result/((julong)G * K) != n) return false;
 590       return true;
 591     case 'G': case 'g':
 592       *result = n * G;
 593       if (*result/G != n) return false;
 594       return true;
 595     case 'M': case 'm':
 596       *result = n * M;
 597       if (*result/M != n) return false;
 598       return true;
 599     case 'K': case 'k':
 600       *result = n * K;
 601       if (*result/K != n) return false;
 602       return true;
 603     case '\0':
 604       *result = n;
 605       return true;
 606     default:
 607       return false;
 608   }
 609 }
 610 
 611 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 612   if (size < min_size) return arg_too_small;
 613   // Check that size will fit in a size_t (only relevant on 32-bit)
 614   if (size > max_uintx) return arg_too_big;
 615   return arg_in_range;
 616 }
 617 
 618 // Describe an argument out of range error
 619 void Arguments::describe_range_error(ArgsRange errcode) {
 620   switch(errcode) {
 621   case arg_too_big:
 622     jio_fprintf(defaultStream::error_stream(),
 623                 "The specified size exceeds the maximum "
 624                 "representable size.\n");
 625     break;
 626   case arg_too_small:
 627   case arg_unreadable:
 628   case arg_in_range:
 629     // do nothing for now
 630     break;
 631   default:
 632     ShouldNotReachHere();
 633   }
 634 }
 635 
 636 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 637   return CommandLineFlags::boolAtPut(name, &value, origin);
 638 }
 639 
 640 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 641   double v;
 642   if (sscanf(value, "%lf", &v) != 1) {
 643     return false;
 644   }
 645 
 646   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 647     return true;
 648   }
 649   return false;
 650 }
 651 
 652 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 653   julong v;
 654   intx intx_v;
 655   bool is_neg = false;
 656   // Check the sign first since atomull() parses only unsigned values.
 657   if (*value == '-') {
 658     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 659       return false;
 660     }
 661     value++;
 662     is_neg = true;
 663   }
 664   if (!atomull(value, &v)) {
 665     return false;
 666   }
 667   intx_v = (intx) v;
 668   if (is_neg) {
 669     intx_v = -intx_v;
 670   }
 671   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 672     return true;
 673   }
 674   uintx uintx_v = (uintx) v;
 675   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 676     return true;
 677   }
 678   uint64_t uint64_t_v = (uint64_t) v;
 679   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 680     return true;
 681   }
 682   size_t size_t_v = (size_t) v;
 683   if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
 684     return true;
 685   }
 686   return false;
 687 }
 688 
 689 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 690   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 691   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 692   FREE_C_HEAP_ARRAY(char, value);
 693   return true;
 694 }
 695 
 696 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 697   const char* old_value = "";
 698   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 699   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 700   size_t new_len = strlen(new_value);
 701   const char* value;
 702   char* free_this_too = NULL;
 703   if (old_len == 0) {
 704     value = new_value;
 705   } else if (new_len == 0) {
 706     value = old_value;
 707   } else {
 708     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 709     // each new setting adds another LINE to the switch:
 710     sprintf(buf, "%s\n%s", old_value, new_value);
 711     value = buf;
 712     free_this_too = buf;
 713   }
 714   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 715   // CommandLineFlags always returns a pointer that needs freeing.
 716   FREE_C_HEAP_ARRAY(char, value);
 717   if (free_this_too != NULL) {
 718     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 719     FREE_C_HEAP_ARRAY(char, free_this_too);
 720   }
 721   return true;
 722 }
 723 
 724 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 725 
 726   // range of acceptable characters spelled out for portability reasons
 727 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 728 #define BUFLEN 255
 729   char name[BUFLEN+1];
 730   char dummy;
 731 
 732   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 733     return set_bool_flag(name, false, origin);
 734   }
 735   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 736     return set_bool_flag(name, true, origin);
 737   }
 738 
 739   char punct;
 740   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 741     const char* value = strchr(arg, '=') + 1;
 742     Flag* flag = Flag::find_flag(name, strlen(name));
 743     if (flag != NULL && flag->is_ccstr()) {
 744       if (flag->ccstr_accumulates()) {
 745         return append_to_string_flag(name, value, origin);
 746       } else {
 747         if (value[0] == '\0') {
 748           value = NULL;
 749         }
 750         return set_string_flag(name, value, origin);
 751       }
 752     }
 753   }
 754 
 755   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 756     const char* value = strchr(arg, '=') + 1;
 757     // -XX:Foo:=xxx will reset the string flag to the given value.
 758     if (value[0] == '\0') {
 759       value = NULL;
 760     }
 761     return set_string_flag(name, value, origin);
 762   }
 763 
 764 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 765 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 766 #define        NUMBER_RANGE    "[0123456789]"
 767   char value[BUFLEN + 1];
 768   char value2[BUFLEN + 1];
 769   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 770     // Looks like a floating-point number -- try again with more lenient format string
 771     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 772       return set_fp_numeric_flag(name, value, origin);
 773     }
 774   }
 775 
 776 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 777   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 778     return set_numeric_flag(name, value, origin);
 779   }
 780 
 781   return false;
 782 }
 783 
 784 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 785   assert(bldarray != NULL, "illegal argument");
 786 
 787   if (arg == NULL) {
 788     return;
 789   }
 790 
 791   int new_count = *count + 1;
 792 
 793   // expand the array and add arg to the last element
 794   if (*bldarray == NULL) {
 795     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 796   } else {
 797     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 798   }
 799   (*bldarray)[*count] = os::strdup_check_oom(arg);
 800   *count = new_count;
 801 }
 802 
 803 void Arguments::build_jvm_args(const char* arg) {
 804   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 805 }
 806 
 807 void Arguments::build_jvm_flags(const char* arg) {
 808   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 809 }
 810 
 811 // utility function to return a string that concatenates all
 812 // strings in a given char** array
 813 const char* Arguments::build_resource_string(char** args, int count) {
 814   if (args == NULL || count == 0) {
 815     return NULL;
 816   }
 817   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 818   for (int i = 1; i < count; i++) {
 819     length += strlen(args[i]) + 1; // add 1 for a space
 820   }
 821   char* s = NEW_RESOURCE_ARRAY(char, length);
 822   strcpy(s, args[0]);
 823   for (int j = 1; j < count; j++) {
 824     strcat(s, " ");
 825     strcat(s, args[j]);
 826   }
 827   return (const char*) s;
 828 }
 829 
 830 void Arguments::print_on(outputStream* st) {
 831   st->print_cr("VM Arguments:");
 832   if (num_jvm_flags() > 0) {
 833     st->print("jvm_flags: "); print_jvm_flags_on(st);
 834   }
 835   if (num_jvm_args() > 0) {
 836     st->print("jvm_args: "); print_jvm_args_on(st);
 837   }
 838   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 839   if (_java_class_path != NULL) {
 840     char* path = _java_class_path->value();
 841     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 842   }
 843   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 844 }
 845 
 846 void Arguments::print_jvm_flags_on(outputStream* st) {
 847   if (_num_jvm_flags > 0) {
 848     for (int i=0; i < _num_jvm_flags; i++) {
 849       st->print("%s ", _jvm_flags_array[i]);
 850     }
 851     st->cr();
 852   }
 853 }
 854 
 855 void Arguments::print_jvm_args_on(outputStream* st) {
 856   if (_num_jvm_args > 0) {
 857     for (int i=0; i < _num_jvm_args; i++) {
 858       st->print("%s ", _jvm_args_array[i]);
 859     }
 860     st->cr();
 861   }
 862 }
 863 
 864 bool Arguments::process_argument(const char* arg,
 865     jboolean ignore_unrecognized, Flag::Flags origin) {
 866 
 867   JDK_Version since = JDK_Version();
 868 
 869   if (parse_argument(arg, origin) || ignore_unrecognized) {
 870     return true;
 871   }
 872 
 873   bool has_plus_minus = (*arg == '+' || *arg == '-');
 874   const char* const argname = has_plus_minus ? arg + 1 : arg;
 875   if (is_newly_obsolete(arg, &since)) {
 876     char version[256];
 877     since.to_string(version, sizeof(version));
 878     warning("ignoring option %s; support was removed in %s", argname, version);
 879     return true;
 880   }
 881 
 882   // For locked flags, report a custom error message if available.
 883   // Otherwise, report the standard unrecognized VM option.
 884 
 885   size_t arg_len;
 886   const char* equal_sign = strchr(argname, '=');
 887   if (equal_sign == NULL) {
 888     arg_len = strlen(argname);
 889   } else {
 890     arg_len = equal_sign - argname;
 891   }
 892 
 893   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 894   if (found_flag != NULL) {
 895     char locked_message_buf[BUFLEN];
 896     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 897     if (strlen(locked_message_buf) == 0) {
 898       if (found_flag->is_bool() && !has_plus_minus) {
 899         jio_fprintf(defaultStream::error_stream(),
 900           "Missing +/- setting for VM option '%s'\n", argname);
 901       } else if (!found_flag->is_bool() && has_plus_minus) {
 902         jio_fprintf(defaultStream::error_stream(),
 903           "Unexpected +/- setting in VM option '%s'\n", argname);
 904       } else {
 905         jio_fprintf(defaultStream::error_stream(),
 906           "Improperly specified VM option '%s'\n", argname);
 907       }
 908     } else {
 909       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 910     }
 911   } else {
 912     jio_fprintf(defaultStream::error_stream(),
 913                 "Unrecognized VM option '%s'\n", argname);
 914     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 915     if (fuzzy_matched != NULL) {
 916       jio_fprintf(defaultStream::error_stream(),
 917                   "Did you mean '%s%s%s'? ",
 918                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 919                   fuzzy_matched->_name,
 920                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 921       if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
 922         char version[256];
 923         since.to_string(version, sizeof(version));
 924         jio_fprintf(defaultStream::error_stream(),
 925                     "Warning: support for %s was removed in %s\n",
 926                     fuzzy_matched->_name,
 927                     version);
 928     }
 929   }
 930   }
 931 
 932   // allow for commandline "commenting out" options like -XX:#+Verbose
 933   return arg[0] == '#';
 934 }
 935 
 936 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 937   FILE* stream = fopen(file_name, "rb");
 938   if (stream == NULL) {
 939     if (should_exist) {
 940       jio_fprintf(defaultStream::error_stream(),
 941                   "Could not open settings file %s\n", file_name);
 942       return false;
 943     } else {
 944       return true;
 945     }
 946   }
 947 
 948   char token[1024];
 949   int  pos = 0;
 950 
 951   bool in_white_space = true;
 952   bool in_comment     = false;
 953   bool in_quote       = false;
 954   char quote_c        = 0;
 955   bool result         = true;
 956 
 957   int c = getc(stream);
 958   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 959     if (in_white_space) {
 960       if (in_comment) {
 961         if (c == '\n') in_comment = false;
 962       } else {
 963         if (c == '#') in_comment = true;
 964         else if (!isspace(c)) {
 965           in_white_space = false;
 966           token[pos++] = c;
 967         }
 968       }
 969     } else {
 970       if (c == '\n' || (!in_quote && isspace(c))) {
 971         // token ends at newline, or at unquoted whitespace
 972         // this allows a way to include spaces in string-valued options
 973         token[pos] = '\0';
 974         logOption(token);
 975         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 976         build_jvm_flags(token);
 977         pos = 0;
 978         in_white_space = true;
 979         in_quote = false;
 980       } else if (!in_quote && (c == '\'' || c == '"')) {
 981         in_quote = true;
 982         quote_c = c;
 983       } else if (in_quote && (c == quote_c)) {
 984         in_quote = false;
 985       } else {
 986         token[pos++] = c;
 987       }
 988     }
 989     c = getc(stream);
 990   }
 991   if (pos > 0) {
 992     token[pos] = '\0';
 993     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 994     build_jvm_flags(token);
 995   }
 996   fclose(stream);
 997   return result;
 998 }
 999 
1000 //=============================================================================================================
1001 // Parsing of properties (-D)
1002 
1003 const char* Arguments::get_property(const char* key) {
1004   return PropertyList_get_value(system_properties(), key);
1005 }
1006 
1007 bool Arguments::add_property(const char* prop) {
1008   const char* eq = strchr(prop, '=');
1009   char* key;
1010   // ns must be static--its address may be stored in a SystemProperty object.
1011   const static char ns[1] = {0};
1012   char* value = (char *)ns;
1013 
1014   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1015   key = AllocateHeap(key_len + 1, mtInternal);
1016   strncpy(key, prop, key_len);
1017   key[key_len] = '\0';
1018 
1019   if (eq != NULL) {
1020     size_t value_len = strlen(prop) - key_len - 1;
1021     value = AllocateHeap(value_len + 1, mtInternal);
1022     strncpy(value, &prop[key_len + 1], value_len + 1);
1023   }
1024 
1025   if (strcmp(key, "java.compiler") == 0) {
1026     process_java_compiler_argument(value);
1027     FreeHeap(key);
1028     if (eq != NULL) {
1029       FreeHeap(value);
1030     }
1031     return true;
1032   } else if (strcmp(key, "sun.java.command") == 0) {
1033     _java_command = value;
1034 
1035     // Record value in Arguments, but let it get passed to Java.
1036   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1037              strcmp(key, "sun.java.launcher.pid") == 0) {
1038     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1039     // private and are processed in process_sun_java_launcher_properties();
1040     // the sun.java.launcher property is passed on to the java application
1041     FreeHeap(key);
1042     if (eq != NULL) {
1043       FreeHeap(value);
1044     }
1045     return true;
1046   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1047     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1048     // its value without going through the property list or making a Java call.
1049     _java_vendor_url_bug = value;
1050   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1051     PropertyList_unique_add(&_system_properties, key, value, true);
1052     return true;
1053   }
1054   // Create new property and add at the end of the list
1055   PropertyList_unique_add(&_system_properties, key, value);
1056   return true;
1057 }
1058 
1059 //===========================================================================================================
1060 // Setting int/mixed/comp mode flags
1061 
1062 void Arguments::set_mode_flags(Mode mode) {
1063   // Set up default values for all flags.
1064   // If you add a flag to any of the branches below,
1065   // add a default value for it here.
1066   set_java_compiler(false);
1067   _mode                      = mode;
1068 
1069   // Ensure Agent_OnLoad has the correct initial values.
1070   // This may not be the final mode; mode may change later in onload phase.
1071   PropertyList_unique_add(&_system_properties, "java.vm.info",
1072                           (char*)VM_Version::vm_info_string(), false);
1073 
1074   UseInterpreter             = true;
1075   UseCompiler                = true;
1076   UseLoopCounter             = true;
1077 
1078   // Default values may be platform/compiler dependent -
1079   // use the saved values
1080   ClipInlining               = Arguments::_ClipInlining;
1081   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1082   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1083   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1084 
1085   // Change from defaults based on mode
1086   switch (mode) {
1087   default:
1088     ShouldNotReachHere();
1089     break;
1090   case _int:
1091     UseCompiler              = false;
1092     UseLoopCounter           = false;
1093     AlwaysCompileLoopMethods = false;
1094     UseOnStackReplacement    = false;
1095     break;
1096   case _mixed:
1097     // same as default
1098     break;
1099   case _comp:
1100     UseInterpreter           = false;
1101     BackgroundCompilation    = false;
1102     ClipInlining             = false;
1103     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1104     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1105     // compile a level 4 (C2) and then continue executing it.
1106     if (TieredCompilation) {
1107       Tier3InvokeNotifyFreqLog = 0;
1108       Tier4InvocationThreshold = 0;
1109     }
1110     break;
1111   }
1112 }
1113 
1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1115 // Conflict: required to use shared spaces (-Xshare:on), but
1116 // incompatible command line options were chosen.
1117 
1118 static void no_shared_spaces(const char* message) {
1119   if (RequireSharedSpaces) {
1120     jio_fprintf(defaultStream::error_stream(),
1121       "Class data sharing is inconsistent with other specified options.\n");
1122     vm_exit_during_initialization("Unable to use shared archive.", message);
1123   } else {
1124     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1125   }
1126 }
1127 #endif
1128 
1129 // Returns threshold scaled with CompileThresholdScaling
1130 intx Arguments::get_scaled_compile_threshold(intx threshold) {
1131   return (intx)(threshold * CompileThresholdScaling);
1132 }
1133 
1134 // Returns freq_log scaled with CompileThresholdScaling
1135 intx Arguments::get_scaled_freq_log(intx freq_log) {
1136   intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log);
1137   if (scaled_freq == 0) {
1138     return 0;
1139   } else {
1140     return log2_intptr(scaled_freq);
1141   }
1142 }
1143 
1144 void Arguments::set_tiered_flags() {
1145   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1146   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1147     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1148   }
1149   if (CompilationPolicyChoice < 2) {
1150     vm_exit_during_initialization(
1151       "Incompatible compilation policy selected", NULL);
1152   }
1153   // Increase the code cache size - tiered compiles a lot more.
1154   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1155     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1156   }
1157   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1158   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1159     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1160 
1161     if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1162       // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1163       if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1164         FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1165       }
1166       if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1167         FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1168       }
1169       // Check consistency of code heap sizes
1170       if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1171         jio_fprintf(defaultStream::error_stream(),
1172                     "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1173                     NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1174                     (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1175         vm_exit(1);
1176       }
1177     }
1178   }
1179   if (!UseInterpreter) { // -Xcomp
1180     Tier3InvokeNotifyFreqLog = 0;
1181     Tier4InvocationThreshold = 0;
1182   }
1183   // Scale tiered compilation thresholds
1184   if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
1185     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog));
1186     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1187 
1188     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold));
1189     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold));
1190     FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold));
1191     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold));
1192 
1193     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1194     // once these thresholds become supported.
1195 
1196     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog));
1197     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1198 
1199     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog));
1200     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1201 
1202     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog));
1203 
1204     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold));
1205     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold));
1206     FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold));
1207     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold));
1208   }
1209 }
1210 
1211 /**
1212  * Returns the minimum number of compiler threads needed to run the JVM. The following
1213  * configurations are possible.
1214  *
1215  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1216  *    compiler threads is 0.
1217  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1218  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1219  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1220  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1221  *    C1 can be used, so the minimum number of compiler threads is 1.
1222  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1223  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1224  *    the minimum number of compiler threads is 2.
1225  */
1226 int Arguments::get_min_number_of_compiler_threads() {
1227 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1228   return 0;   // case 1
1229 #else
1230   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1231     return 1; // case 2 or case 3
1232   }
1233   return 2;   // case 4 (tiered)
1234 #endif
1235 }
1236 
1237 #if INCLUDE_ALL_GCS
1238 static void disable_adaptive_size_policy(const char* collector_name) {
1239   if (UseAdaptiveSizePolicy) {
1240     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1241       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1242               collector_name);
1243     }
1244     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1245   }
1246 }
1247 
1248 void Arguments::set_parnew_gc_flags() {
1249   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1250          "control point invariant");
1251   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1252   assert(UseParNewGC, "ParNew should always be used with CMS");
1253 
1254   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1255     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1256     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1257   } else if (ParallelGCThreads == 0) {
1258     jio_fprintf(defaultStream::error_stream(),
1259         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1260     vm_exit(1);
1261   }
1262 
1263   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1264   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1265   // we set them to 1024 and 1024.
1266   // See CR 6362902.
1267   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1268     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1269   }
1270   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1271     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1272   }
1273 
1274   // When using compressed oops, we use local overflow stacks,
1275   // rather than using a global overflow list chained through
1276   // the klass word of the object's pre-image.
1277   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1278     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1279       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1280     }
1281     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1282   }
1283   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1284 }
1285 
1286 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1287 // sparc/solaris for certain applications, but would gain from
1288 // further optimization and tuning efforts, and would almost
1289 // certainly gain from analysis of platform and environment.
1290 void Arguments::set_cms_and_parnew_gc_flags() {
1291   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1292   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1293   assert(UseParNewGC, "ParNew should always be used with CMS");
1294 
1295   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1296   disable_adaptive_size_policy("UseConcMarkSweepGC");
1297 
1298   set_parnew_gc_flags();
1299 
1300   size_t max_heap = align_size_down(MaxHeapSize,
1301                                     CardTableRS::ct_max_alignment_constraint());
1302 
1303   // Now make adjustments for CMS
1304   intx   tenuring_default = (intx)6;
1305   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1306 
1307   // Preferred young gen size for "short" pauses:
1308   // upper bound depends on # of threads and NewRatio.
1309   const uintx parallel_gc_threads =
1310     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1311   const size_t preferred_max_new_size_unaligned =
1312     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1313   size_t preferred_max_new_size =
1314     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1315 
1316   // Unless explicitly requested otherwise, size young gen
1317   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1318 
1319   // If either MaxNewSize or NewRatio is set on the command line,
1320   // assume the user is trying to set the size of the young gen.
1321   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1322 
1323     // Set MaxNewSize to our calculated preferred_max_new_size unless
1324     // NewSize was set on the command line and it is larger than
1325     // preferred_max_new_size.
1326     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1327       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1328     } else {
1329       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1330     }
1331     if (PrintGCDetails && Verbose) {
1332       // Too early to use gclog_or_tty
1333       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1334     }
1335 
1336     // Code along this path potentially sets NewSize and OldSize
1337     if (PrintGCDetails && Verbose) {
1338       // Too early to use gclog_or_tty
1339       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1340            " initial_heap_size:  " SIZE_FORMAT
1341            " max_heap: " SIZE_FORMAT,
1342            min_heap_size(), InitialHeapSize, max_heap);
1343     }
1344     size_t min_new = preferred_max_new_size;
1345     if (FLAG_IS_CMDLINE(NewSize)) {
1346       min_new = NewSize;
1347     }
1348     if (max_heap > min_new && min_heap_size() > min_new) {
1349       // Unless explicitly requested otherwise, make young gen
1350       // at least min_new, and at most preferred_max_new_size.
1351       if (FLAG_IS_DEFAULT(NewSize)) {
1352         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1353         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1354         if (PrintGCDetails && Verbose) {
1355           // Too early to use gclog_or_tty
1356           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1357         }
1358       }
1359       // Unless explicitly requested otherwise, size old gen
1360       // so it's NewRatio x of NewSize.
1361       if (FLAG_IS_DEFAULT(OldSize)) {
1362         if (max_heap > NewSize) {
1363           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1364           if (PrintGCDetails && Verbose) {
1365             // Too early to use gclog_or_tty
1366             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1367           }
1368         }
1369       }
1370     }
1371   }
1372   // Unless explicitly requested otherwise, definitely
1373   // promote all objects surviving "tenuring_default" scavenges.
1374   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1375       FLAG_IS_DEFAULT(SurvivorRatio)) {
1376     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1377   }
1378   // If we decided above (or user explicitly requested)
1379   // `promote all' (via MaxTenuringThreshold := 0),
1380   // prefer minuscule survivor spaces so as not to waste
1381   // space for (non-existent) survivors
1382   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1383     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1384   }
1385 
1386   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1387   // but rather the number of free blocks of a given size that are used when
1388   // replenishing the local per-worker free list caches.
1389   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1390     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1391       // OldPLAB sizing manually turned off: Use a larger default setting,
1392       // unless it was manually specified. This is because a too-low value
1393       // will slow down scavenges.
1394       FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1395     } else {
1396       FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1397     }
1398   }
1399 
1400   // If either of the static initialization defaults have changed, note this
1401   // modification.
1402   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1403     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1404   }
1405   if (PrintGCDetails && Verbose) {
1406     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1407       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1408     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1409   }
1410 }
1411 #endif // INCLUDE_ALL_GCS
1412 
1413 void set_object_alignment() {
1414   // Object alignment.
1415   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1416   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1417   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1418   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1419   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1420   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1421 
1422   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1423   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1424 
1425   // Oop encoding heap max
1426   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1427 
1428 #if INCLUDE_ALL_GCS
1429   // Set CMS global values
1430   CompactibleFreeListSpace::set_cms_values();
1431 #endif // INCLUDE_ALL_GCS
1432 }
1433 
1434 bool verify_object_alignment() {
1435   // Object alignment.
1436   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1437     jio_fprintf(defaultStream::error_stream(),
1438                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1439                 (int)ObjectAlignmentInBytes);
1440     return false;
1441   }
1442   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1443     jio_fprintf(defaultStream::error_stream(),
1444                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1445                 (int)ObjectAlignmentInBytes, BytesPerLong);
1446     return false;
1447   }
1448   // It does not make sense to have big object alignment
1449   // since a space lost due to alignment will be greater
1450   // then a saved space from compressed oops.
1451   if ((int)ObjectAlignmentInBytes > 256) {
1452     jio_fprintf(defaultStream::error_stream(),
1453                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1454                 (int)ObjectAlignmentInBytes);
1455     return false;
1456   }
1457   // In case page size is very small.
1458   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1459     jio_fprintf(defaultStream::error_stream(),
1460                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1461                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1462     return false;
1463   }
1464   if(SurvivorAlignmentInBytes == 0) {
1465     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1466   } else {
1467     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1468       jio_fprintf(defaultStream::error_stream(),
1469             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1470             (int)SurvivorAlignmentInBytes);
1471       return false;
1472     }
1473     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1474       jio_fprintf(defaultStream::error_stream(),
1475           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1476           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1477       return false;
1478     }
1479   }
1480   return true;
1481 }
1482 
1483 size_t Arguments::max_heap_for_compressed_oops() {
1484   // Avoid sign flip.
1485   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1486   // We need to fit both the NULL page and the heap into the memory budget, while
1487   // keeping alignment constraints of the heap. To guarantee the latter, as the
1488   // NULL page is located before the heap, we pad the NULL page to the conservative
1489   // maximum alignment that the GC may ever impose upon the heap.
1490   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1491                                                         _conservative_max_heap_alignment);
1492 
1493   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1494   NOT_LP64(ShouldNotReachHere(); return 0);
1495 }
1496 
1497 bool Arguments::should_auto_select_low_pause_collector() {
1498   if (UseAutoGCSelectPolicy &&
1499       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1500       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1501     if (PrintGCDetails) {
1502       // Cannot use gclog_or_tty yet.
1503       tty->print_cr("Automatic selection of the low pause collector"
1504        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1505     }
1506     return true;
1507   }
1508   return false;
1509 }
1510 
1511 void Arguments::set_use_compressed_oops() {
1512 #ifndef ZERO
1513 #ifdef _LP64
1514   // MaxHeapSize is not set up properly at this point, but
1515   // the only value that can override MaxHeapSize if we are
1516   // to use UseCompressedOops is InitialHeapSize.
1517   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1518 
1519   if (max_heap_size <= max_heap_for_compressed_oops()) {
1520 #if !defined(COMPILER1) || defined(TIERED)
1521     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1522       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1523     }
1524 #endif
1525   } else {
1526     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1527       warning("Max heap size too large for Compressed Oops");
1528       FLAG_SET_DEFAULT(UseCompressedOops, false);
1529       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1530     }
1531   }
1532 #endif // _LP64
1533 #endif // ZERO
1534 }
1535 
1536 
1537 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1538 // set_use_compressed_oops().
1539 void Arguments::set_use_compressed_klass_ptrs() {
1540 #ifndef ZERO
1541 #ifdef _LP64
1542   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1543   if (!UseCompressedOops) {
1544     if (UseCompressedClassPointers) {
1545       warning("UseCompressedClassPointers requires UseCompressedOops");
1546     }
1547     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1548   } else {
1549     // Turn on UseCompressedClassPointers too
1550     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1551       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1552     }
1553     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1554     if (UseCompressedClassPointers) {
1555       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1556         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1557         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1558       }
1559     }
1560   }
1561 #endif // _LP64
1562 #endif // !ZERO
1563 }
1564 
1565 void Arguments::set_conservative_max_heap_alignment() {
1566   // The conservative maximum required alignment for the heap is the maximum of
1567   // the alignments imposed by several sources: any requirements from the heap
1568   // itself, the collector policy and the maximum page size we may run the VM
1569   // with.
1570   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1571 #if INCLUDE_ALL_GCS
1572   if (UseParallelGC) {
1573     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1574   } else if (UseG1GC) {
1575     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1576   }
1577 #endif // INCLUDE_ALL_GCS
1578   _conservative_max_heap_alignment = MAX4(heap_alignment,
1579                                           (size_t)os::vm_allocation_granularity(),
1580                                           os::max_page_size(),
1581                                           CollectorPolicy::compute_heap_alignment());
1582 }
1583 
1584 void Arguments::select_gc_ergonomically() {
1585   if (os::is_server_class_machine()) {
1586     if (should_auto_select_low_pause_collector()) {
1587       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1588     } else {
1589       FLAG_SET_ERGO(bool, UseParallelGC, true);
1590     }
1591   }
1592 }
1593 
1594 void Arguments::select_gc() {
1595   if (!gc_selected()) {
1596     ArgumentsExt::select_gc_ergonomically();
1597   }
1598 }
1599 
1600 void Arguments::set_ergonomics_flags() {
1601   select_gc();
1602 
1603 #ifdef COMPILER2
1604   // Shared spaces work fine with other GCs but causes bytecode rewriting
1605   // to be disabled, which hurts interpreter performance and decreases
1606   // server performance.  When -server is specified, keep the default off
1607   // unless it is asked for.  Future work: either add bytecode rewriting
1608   // at link time, or rewrite bytecodes in non-shared methods.
1609   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1610       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1611     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1612   }
1613 #endif
1614 
1615   set_conservative_max_heap_alignment();
1616 
1617 #ifndef ZERO
1618 #ifdef _LP64
1619   set_use_compressed_oops();
1620 
1621   // set_use_compressed_klass_ptrs() must be called after calling
1622   // set_use_compressed_oops().
1623   set_use_compressed_klass_ptrs();
1624 
1625   // Also checks that certain machines are slower with compressed oops
1626   // in vm_version initialization code.
1627 #endif // _LP64
1628 #endif // !ZERO
1629 }
1630 
1631 void Arguments::set_parallel_gc_flags() {
1632   assert(UseParallelGC || UseParallelOldGC, "Error");
1633   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1634   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1635     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1636   }
1637   FLAG_SET_DEFAULT(UseParallelGC, true);
1638 
1639   // If no heap maximum was requested explicitly, use some reasonable fraction
1640   // of the physical memory, up to a maximum of 1GB.
1641   FLAG_SET_DEFAULT(ParallelGCThreads,
1642                    Abstract_VM_Version::parallel_worker_threads());
1643   if (ParallelGCThreads == 0) {
1644     jio_fprintf(defaultStream::error_stream(),
1645         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1646     vm_exit(1);
1647   }
1648 
1649   if (UseAdaptiveSizePolicy) {
1650     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1651     // unless the user actually sets these flags.
1652     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1653       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1654       _min_heap_free_ratio = MinHeapFreeRatio;
1655     }
1656     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1657       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1658       _max_heap_free_ratio = MaxHeapFreeRatio;
1659     }
1660   }
1661 
1662   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1663   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1664   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1665   // See CR 6362902 for details.
1666   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1667     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1668        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1669     }
1670     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1671       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1672     }
1673   }
1674 
1675   if (UseParallelOldGC) {
1676     // Par compact uses lower default values since they are treated as
1677     // minimums.  These are different defaults because of the different
1678     // interpretation and are not ergonomically set.
1679     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1680       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1681     }
1682   }
1683 }
1684 
1685 void Arguments::set_g1_gc_flags() {
1686   assert(UseG1GC, "Error");
1687 #ifdef COMPILER1
1688   FastTLABRefill = false;
1689 #endif
1690   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1691   if (ParallelGCThreads == 0) {
1692     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1693     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1694   }
1695 
1696 #if INCLUDE_ALL_GCS
1697   if (G1ConcRefinementThreads == 0) {
1698     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1699   }
1700 #endif
1701 
1702   // MarkStackSize will be set (if it hasn't been set by the user)
1703   // when concurrent marking is initialized.
1704   // Its value will be based upon the number of parallel marking threads.
1705   // But we do set the maximum mark stack size here.
1706   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1707     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1708   }
1709 
1710   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1711     // In G1, we want the default GC overhead goal to be higher than
1712     // say in PS. So we set it here to 10%. Otherwise the heap might
1713     // be expanded more aggressively than we would like it to. In
1714     // fact, even 10% seems to not be high enough in some cases
1715     // (especially small GC stress tests that the main thing they do
1716     // is allocation). We might consider increase it further.
1717     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1718   }
1719 
1720   if (PrintGCDetails && Verbose) {
1721     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1722       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1723     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1724   }
1725 }
1726 
1727 #if !INCLUDE_ALL_GCS
1728 #ifdef ASSERT
1729 static bool verify_serial_gc_flags() {
1730   return (UseSerialGC &&
1731         !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1732           UseParallelGC || UseParallelOldGC));
1733 }
1734 #endif // ASSERT
1735 #endif // INCLUDE_ALL_GCS
1736 
1737 void Arguments::set_gc_specific_flags() {
1738 #if INCLUDE_ALL_GCS
1739   // Set per-collector flags
1740   if (UseParallelGC || UseParallelOldGC) {
1741     set_parallel_gc_flags();
1742   } else if (UseConcMarkSweepGC) {
1743     set_cms_and_parnew_gc_flags();
1744   } else if (UseG1GC) {
1745     set_g1_gc_flags();
1746   }
1747   check_deprecated_gc_flags();
1748   if (AssumeMP && !UseSerialGC) {
1749     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1750       warning("If the number of processors is expected to increase from one, then"
1751               " you should configure the number of parallel GC threads appropriately"
1752               " using -XX:ParallelGCThreads=N");
1753     }
1754   }
1755   if (MinHeapFreeRatio == 100) {
1756     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1757     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1758   }
1759 #else // INCLUDE_ALL_GCS
1760   assert(verify_serial_gc_flags(), "SerialGC unset");
1761 #endif // INCLUDE_ALL_GCS
1762 }
1763 
1764 julong Arguments::limit_by_allocatable_memory(julong limit) {
1765   julong max_allocatable;
1766   julong result = limit;
1767   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1768     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1769   }
1770   return result;
1771 }
1772 
1773 // Use static initialization to get the default before parsing
1774 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1775 
1776 void Arguments::set_heap_size() {
1777   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1778     // Deprecated flag
1779     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1780   }
1781 
1782   const julong phys_mem =
1783     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1784                             : (julong)MaxRAM;
1785 
1786   // If the maximum heap size has not been set with -Xmx,
1787   // then set it as fraction of the size of physical memory,
1788   // respecting the maximum and minimum sizes of the heap.
1789   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1790     julong reasonable_max = phys_mem / MaxRAMFraction;
1791 
1792     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1793       // Small physical memory, so use a minimum fraction of it for the heap
1794       reasonable_max = phys_mem / MinRAMFraction;
1795     } else {
1796       // Not-small physical memory, so require a heap at least
1797       // as large as MaxHeapSize
1798       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1799     }
1800     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1801       // Limit the heap size to ErgoHeapSizeLimit
1802       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1803     }
1804     if (UseCompressedOops) {
1805       // Limit the heap size to the maximum possible when using compressed oops
1806       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1807 
1808       // HeapBaseMinAddress can be greater than default but not less than.
1809       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1810         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1811           // matches compressed oops printing flags
1812           if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1813             jio_fprintf(defaultStream::error_stream(),
1814                         "HeapBaseMinAddress must be at least " UINTX_FORMAT
1815                         " (" UINTX_FORMAT "G) which is greater than value given "
1816                         UINTX_FORMAT "\n",
1817                         DefaultHeapBaseMinAddress,
1818                         DefaultHeapBaseMinAddress/G,
1819                         HeapBaseMinAddress);
1820           }
1821           FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1822         }
1823       }
1824 
1825       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1826         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1827         // but it should be not less than default MaxHeapSize.
1828         max_coop_heap -= HeapBaseMinAddress;
1829       }
1830       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1831     }
1832     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1833 
1834     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1835       // An initial heap size was specified on the command line,
1836       // so be sure that the maximum size is consistent.  Done
1837       // after call to limit_by_allocatable_memory because that
1838       // method might reduce the allocation size.
1839       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1840     }
1841 
1842     if (PrintGCDetails && Verbose) {
1843       // Cannot use gclog_or_tty yet.
1844       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1845     }
1846     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1847   }
1848 
1849   // If the minimum or initial heap_size have not been set or requested to be set
1850   // ergonomically, set them accordingly.
1851   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1852     julong reasonable_minimum = (julong)(OldSize + NewSize);
1853 
1854     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1855 
1856     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1857 
1858     if (InitialHeapSize == 0) {
1859       julong reasonable_initial = phys_mem / InitialRAMFraction;
1860 
1861       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1862       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1863 
1864       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1865 
1866       if (PrintGCDetails && Verbose) {
1867         // Cannot use gclog_or_tty yet.
1868         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1869       }
1870       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1871     }
1872     // If the minimum heap size has not been set (via -Xms),
1873     // synchronize with InitialHeapSize to avoid errors with the default value.
1874     if (min_heap_size() == 0) {
1875       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1876       if (PrintGCDetails && Verbose) {
1877         // Cannot use gclog_or_tty yet.
1878         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1879       }
1880     }
1881   }
1882 }
1883 
1884 // This must be called after ergonomics because we want bytecode rewriting
1885 // if the server compiler is used, or if UseSharedSpaces is disabled.
1886 void Arguments::set_bytecode_flags() {
1887   // Better not attempt to store into a read-only space.
1888   if (UseSharedSpaces) {
1889     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1890     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1891   }
1892 
1893   if (!RewriteBytecodes) {
1894     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1895   }
1896 }
1897 
1898 // Aggressive optimization flags  -XX:+AggressiveOpts
1899 void Arguments::set_aggressive_opts_flags() {
1900 #ifdef COMPILER2
1901   if (AggressiveUnboxing) {
1902     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1903       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1904     } else if (!EliminateAutoBox) {
1905       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1906       AggressiveUnboxing = false;
1907     }
1908     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1909       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1910     } else if (!DoEscapeAnalysis) {
1911       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1912       AggressiveUnboxing = false;
1913     }
1914   }
1915   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1916     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1917       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1918     }
1919     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1920       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1921     }
1922 
1923     // Feed the cache size setting into the JDK
1924     char buffer[1024];
1925     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1926     add_property(buffer);
1927   }
1928   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1929     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1930   }
1931 #endif
1932 
1933   if (AggressiveOpts) {
1934 // Sample flag setting code
1935 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1936 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1937 //    }
1938   }
1939 }
1940 
1941 //===========================================================================================================
1942 // Parsing of java.compiler property
1943 
1944 void Arguments::process_java_compiler_argument(char* arg) {
1945   // For backwards compatibility, Djava.compiler=NONE or ""
1946   // causes us to switch to -Xint mode UNLESS -Xdebug
1947   // is also specified.
1948   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1949     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1950   }
1951 }
1952 
1953 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1954   _sun_java_launcher = os::strdup_check_oom(launcher);
1955 }
1956 
1957 bool Arguments::created_by_java_launcher() {
1958   assert(_sun_java_launcher != NULL, "property must have value");
1959   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1960 }
1961 
1962 bool Arguments::sun_java_launcher_is_altjvm() {
1963   return _sun_java_launcher_is_altjvm;
1964 }
1965 
1966 //===========================================================================================================
1967 // Parsing of main arguments
1968 
1969 bool Arguments::verify_interval(uintx val, uintx min,
1970                                 uintx max, const char* name) {
1971   // Returns true iff value is in the inclusive interval [min..max]
1972   // false, otherwise.
1973   if (val >= min && val <= max) {
1974     return true;
1975   }
1976   jio_fprintf(defaultStream::error_stream(),
1977               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1978               " and " UINTX_FORMAT "\n",
1979               name, val, min, max);
1980   return false;
1981 }
1982 
1983 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1984   // Returns true if given value is at least specified min threshold
1985   // false, otherwise.
1986   if (val >= min ) {
1987       return true;
1988   }
1989   jio_fprintf(defaultStream::error_stream(),
1990               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1991               name, val, min);
1992   return false;
1993 }
1994 
1995 bool Arguments::verify_percentage(uintx value, const char* name) {
1996   if (is_percentage(value)) {
1997     return true;
1998   }
1999   jio_fprintf(defaultStream::error_stream(),
2000               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2001               name, value);
2002   return false;
2003 }
2004 
2005 // check if do gclog rotation
2006 // +UseGCLogFileRotation is a must,
2007 // no gc log rotation when log file not supplied or
2008 // NumberOfGCLogFiles is 0
2009 void check_gclog_consistency() {
2010   if (UseGCLogFileRotation) {
2011     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2012       jio_fprintf(defaultStream::output_stream(),
2013                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2014                   "where num_of_file > 0\n"
2015                   "GC log rotation is turned off\n");
2016       UseGCLogFileRotation = false;
2017     }
2018   }
2019 
2020   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2021     FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2022     jio_fprintf(defaultStream::output_stream(),
2023                 "GCLogFileSize changed to minimum 8K\n");
2024   }
2025 }
2026 
2027 // This function is called for -Xloggc:<filename>, it can be used
2028 // to check if a given file name(or string) conforms to the following
2029 // specification:
2030 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2031 // %p and %t only allowed once. We only limit usage of filename not path
2032 bool is_filename_valid(const char *file_name) {
2033   const char* p = file_name;
2034   char file_sep = os::file_separator()[0];
2035   const char* cp;
2036   // skip prefix path
2037   for (cp = file_name; *cp != '\0'; cp++) {
2038     if (*cp == '/' || *cp == file_sep) {
2039       p = cp + 1;
2040     }
2041   }
2042 
2043   int count_p = 0;
2044   int count_t = 0;
2045   while (*p != '\0') {
2046     if ((*p >= '0' && *p <= '9') ||
2047         (*p >= 'A' && *p <= 'Z') ||
2048         (*p >= 'a' && *p <= 'z') ||
2049          *p == '-'               ||
2050          *p == '_'               ||
2051          *p == '.') {
2052        p++;
2053        continue;
2054     }
2055     if (*p == '%') {
2056       if(*(p + 1) == 'p') {
2057         p += 2;
2058         count_p ++;
2059         continue;
2060       }
2061       if (*(p + 1) == 't') {
2062         p += 2;
2063         count_t ++;
2064         continue;
2065       }
2066     }
2067     return false;
2068   }
2069   return count_p < 2 && count_t < 2;
2070 }
2071 
2072 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2073   if (!is_percentage(min_heap_free_ratio)) {
2074     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2075     return false;
2076   }
2077   if (min_heap_free_ratio > MaxHeapFreeRatio) {
2078     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2079                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2080                   MaxHeapFreeRatio);
2081     return false;
2082   }
2083   // This does not set the flag itself, but stores the value in a safe place for later usage.
2084   _min_heap_free_ratio = min_heap_free_ratio;
2085   return true;
2086 }
2087 
2088 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2089   if (!is_percentage(max_heap_free_ratio)) {
2090     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2091     return false;
2092   }
2093   if (max_heap_free_ratio < MinHeapFreeRatio) {
2094     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2095                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2096                   MinHeapFreeRatio);
2097     return false;
2098   }
2099   // This does not set the flag itself, but stores the value in a safe place for later usage.
2100   _max_heap_free_ratio = max_heap_free_ratio;
2101   return true;
2102 }
2103 
2104 // Check consistency of GC selection
2105 bool Arguments::check_gc_consistency_user() {
2106   check_gclog_consistency();
2107   // Ensure that the user has not selected conflicting sets
2108   // of collectors.
2109   uint i = 0;
2110   if (UseSerialGC)                       i++;
2111   if (UseConcMarkSweepGC)                i++;
2112   if (UseParallelGC || UseParallelOldGC) i++;
2113   if (UseG1GC)                           i++;
2114   if (i > 1) {
2115     jio_fprintf(defaultStream::error_stream(),
2116                 "Conflicting collector combinations in option list; "
2117                 "please refer to the release notes for the combinations "
2118                 "allowed\n");
2119     return false;
2120   }
2121 
2122   if (UseConcMarkSweepGC && !UseParNewGC) {
2123     jio_fprintf(defaultStream::error_stream(),
2124         "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2125     return false;
2126   }
2127 
2128   if (UseParNewGC && !UseConcMarkSweepGC) {
2129     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2130     // set up UseSerialGC properly, so that can't be used in the check here.
2131     jio_fprintf(defaultStream::error_stream(),
2132         "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2133     return false;
2134   }
2135 
2136   return true;
2137 }
2138 
2139 void Arguments::check_deprecated_gc_flags() {
2140   if (FLAG_IS_CMDLINE(UseParNewGC)) {
2141     warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2142   }
2143   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2144     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2145             "and will likely be removed in future release");
2146   }
2147   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2148     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2149         "Use MaxRAMFraction instead.");
2150   }
2151 }
2152 
2153 // Check stack pages settings
2154 bool Arguments::check_stack_pages()
2155 {
2156   bool status = true;
2157   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2158   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2159   // greater stack shadow pages can't generate instruction to bang stack
2160   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2161   return status;
2162 }
2163 
2164 // Check the consistency of vm_init_args
2165 bool Arguments::check_vm_args_consistency() {
2166   // Method for adding checks for flag consistency.
2167   // The intent is to warn the user of all possible conflicts,
2168   // before returning an error.
2169   // Note: Needs platform-dependent factoring.
2170   bool status = true;
2171 
2172   if (TLABRefillWasteFraction == 0) {
2173     jio_fprintf(defaultStream::error_stream(),
2174                 "TLABRefillWasteFraction should be a denominator, "
2175                 "not " SIZE_FORMAT "\n",
2176                 TLABRefillWasteFraction);
2177     status = false;
2178   }
2179 
2180   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2181                               "AdaptiveSizePolicyWeight");
2182   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2183 
2184   // Divide by bucket size to prevent a large size from causing rollover when
2185   // calculating amount of memory needed to be allocated for the String table.
2186   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2187     (max_uintx / StringTable::bucket_size()), "StringTable size");
2188 
2189   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2190     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2191 
2192   {
2193     // Using "else if" below to avoid printing two error messages if min > max.
2194     // This will also prevent us from reporting both min>100 and max>100 at the
2195     // same time, but that is less annoying than printing two identical errors IMHO.
2196     FormatBuffer<80> err_msg("%s","");
2197     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2198       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2199       status = false;
2200     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2201       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2202       status = false;
2203     }
2204   }
2205 
2206   // Min/MaxMetaspaceFreeRatio
2207   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2208   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2209 
2210   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2211     jio_fprintf(defaultStream::error_stream(),
2212                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2213                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2214                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2215                 MinMetaspaceFreeRatio,
2216                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2217                 MaxMetaspaceFreeRatio);
2218     status = false;
2219   }
2220 
2221   // Trying to keep 100% free is not practical
2222   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2223 
2224   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2225     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2226   }
2227 
2228   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2229     // Settings to encourage splitting.
2230     if (!FLAG_IS_CMDLINE(NewRatio)) {
2231       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2232     }
2233     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2234       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2235     }
2236   }
2237 
2238   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2239     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2240   }
2241 
2242   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2243   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2244   if (GCTimeLimit == 100) {
2245     // Turn off gc-overhead-limit-exceeded checks
2246     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2247   }
2248 
2249   status = status && check_gc_consistency_user();
2250   status = status && check_stack_pages();
2251 
2252   status = status && verify_percentage(CMSIncrementalSafetyFactor,
2253                                     "CMSIncrementalSafetyFactor");
2254 
2255   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2256   // insists that we hold the requisite locks so that the iteration is
2257   // MT-safe. For the verification at start-up and shut-down, we don't
2258   // yet have a good way of acquiring and releasing these locks,
2259   // which are not visible at the CollectedHeap level. We want to
2260   // be able to acquire these locks and then do the iteration rather
2261   // than just disable the lock verification. This will be fixed under
2262   // bug 4788986.
2263   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2264     if (VerifyDuringStartup) {
2265       warning("Heap verification at start-up disabled "
2266               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2267       VerifyDuringStartup = false; // Disable verification at start-up
2268     }
2269 
2270     if (VerifyBeforeExit) {
2271       warning("Heap verification at shutdown disabled "
2272               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2273       VerifyBeforeExit = false; // Disable verification at shutdown
2274     }
2275   }
2276 
2277   // Note: only executed in non-PRODUCT mode
2278   if (!UseAsyncConcMarkSweepGC &&
2279       (ExplicitGCInvokesConcurrent ||
2280        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2281     jio_fprintf(defaultStream::error_stream(),
2282                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2283                 " with -UseAsyncConcMarkSweepGC");
2284     status = false;
2285   }
2286 
2287   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2288 
2289 #if INCLUDE_ALL_GCS
2290   if (UseG1GC) {
2291     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2292     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2293     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2294 
2295     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2296                                          "InitiatingHeapOccupancyPercent");
2297     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2298                                         "G1RefProcDrainInterval");
2299     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2300                                         "G1ConcMarkStepDurationMillis");
2301     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2302                                        "G1ConcRSHotCardLimit");
2303     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2304                                        "G1ConcRSLogCacheSize");
2305     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2306                                        "StringDeduplicationAgeThreshold");
2307   }
2308   if (UseConcMarkSweepGC) {
2309     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2310     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2311     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2312     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2313 
2314     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2315 
2316     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2317     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2318     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2319 
2320     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2321 
2322     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2323     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2324 
2325     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2326     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2327     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2328 
2329     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2330 
2331     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2332 
2333     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2334     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2335     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2336     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2337     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2338   }
2339 
2340   if (UseParallelGC || UseParallelOldGC) {
2341     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2342     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2343 
2344     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2345     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2346 
2347     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2348     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2349 
2350     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2351 
2352     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2353   }
2354 #endif // INCLUDE_ALL_GCS
2355 
2356   status = status && verify_interval(RefDiscoveryPolicy,
2357                                      ReferenceProcessor::DiscoveryPolicyMin,
2358                                      ReferenceProcessor::DiscoveryPolicyMax,
2359                                      "RefDiscoveryPolicy");
2360 
2361   // Limit the lower bound of this flag to 1 as it is used in a division
2362   // expression.
2363   status = status && verify_interval(TLABWasteTargetPercent,
2364                                      1, 100, "TLABWasteTargetPercent");
2365 
2366   status = status && verify_object_alignment();
2367 
2368   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2369                                       "CompressedClassSpaceSize");
2370 
2371   status = status && verify_interval(MarkStackSizeMax,
2372                                   1, (max_jint - 1), "MarkStackSizeMax");
2373   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2374 
2375   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2376 
2377   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2378 
2379   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2380 
2381   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2382   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2383 
2384   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2385 
2386   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2387   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2388   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2389   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2390 
2391   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2392   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2393 
2394   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2395   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2396   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2397 
2398   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2399   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2400 
2401   status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2402   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2403   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2404   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2405 
2406   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2407 #ifdef COMPILER1
2408   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2409 #endif
2410   status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2411 
2412   if (PrintNMTStatistics) {
2413 #if INCLUDE_NMT
2414     if (MemTracker::tracking_level() == NMT_off) {
2415 #endif // INCLUDE_NMT
2416       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2417       PrintNMTStatistics = false;
2418 #if INCLUDE_NMT
2419     }
2420 #endif
2421   }
2422 
2423   // Need to limit the extent of the padding to reasonable size.
2424   // 8K is well beyond the reasonable HW cache line size, even with the
2425   // aggressive prefetching, while still leaving the room for segregating
2426   // among the distinct pages.
2427   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2428     jio_fprintf(defaultStream::error_stream(),
2429                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2430                 ContendedPaddingWidth, 0, 8192);
2431     status = false;
2432   }
2433 
2434   // Need to enforce the padding not to break the existing field alignments.
2435   // It is sufficient to check against the largest type size.
2436   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2437     jio_fprintf(defaultStream::error_stream(),
2438                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2439                 ContendedPaddingWidth, BytesPerLong);
2440     status = false;
2441   }
2442 
2443   // Check lower bounds of the code cache
2444   // Template Interpreter code is approximately 3X larger in debug builds.
2445   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2446   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2447     jio_fprintf(defaultStream::error_stream(),
2448                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2449                 os::vm_page_size()/K);
2450     status = false;
2451   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2452     jio_fprintf(defaultStream::error_stream(),
2453                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2454                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2455     status = false;
2456   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2457     jio_fprintf(defaultStream::error_stream(),
2458                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2459                 min_code_cache_size/K);
2460     status = false;
2461   } else if (ReservedCodeCacheSize > 2*G) {
2462     // Code cache size larger than MAXINT is not supported.
2463     jio_fprintf(defaultStream::error_stream(),
2464                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2465                 (2*G)/M);
2466     status = false;
2467   } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2468     jio_fprintf(defaultStream::error_stream(),
2469                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2470                 min_code_cache_size/K);
2471     status = false;
2472   } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2473              && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2474     jio_fprintf(defaultStream::error_stream(),
2475                 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2476                 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2477                 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2478     status = false;
2479   }
2480 
2481   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2482   status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2483   status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2484   status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2485 
2486 
2487   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2488   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2489   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2490   // Check the minimum number of compiler threads
2491   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2492 
2493   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2494     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2495   }
2496 
2497   return status;
2498 }
2499 
2500 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2501   const char* option_type) {
2502   if (ignore) return false;
2503 
2504   const char* spacer = " ";
2505   if (option_type == NULL) {
2506     option_type = ++spacer; // Set both to the empty string.
2507   }
2508 
2509   if (os::obsolete_option(option)) {
2510     jio_fprintf(defaultStream::error_stream(),
2511                 "Obsolete %s%soption: %s\n", option_type, spacer,
2512       option->optionString);
2513     return false;
2514   } else {
2515     jio_fprintf(defaultStream::error_stream(),
2516                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2517       option->optionString);
2518     return true;
2519   }
2520 }
2521 
2522 static const char* user_assertion_options[] = {
2523   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2524 };
2525 
2526 static const char* system_assertion_options[] = {
2527   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2528 };
2529 
2530 bool Arguments::parse_uintx(const char* value,
2531                             uintx* uintx_arg,
2532                             uintx min_size) {
2533 
2534   // Check the sign first since atomull() parses only unsigned values.
2535   bool value_is_positive = !(*value == '-');
2536 
2537   if (value_is_positive) {
2538     julong n;
2539     bool good_return = atomull(value, &n);
2540     if (good_return) {
2541       bool above_minimum = n >= min_size;
2542       bool value_is_too_large = n > max_uintx;
2543 
2544       if (above_minimum && !value_is_too_large) {
2545         *uintx_arg = n;
2546         return true;
2547       }
2548     }
2549   }
2550   return false;
2551 }
2552 
2553 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2554                                                   julong* long_arg,
2555                                                   julong min_size) {
2556   if (!atomull(s, long_arg)) return arg_unreadable;
2557   return check_memory_size(*long_arg, min_size);
2558 }
2559 
2560 // Parse JavaVMInitArgs structure
2561 
2562 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2563   // For components of the system classpath.
2564   SysClassPath scp(Arguments::get_sysclasspath());
2565   bool scp_assembly_required = false;
2566 
2567   // Save default settings for some mode flags
2568   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2569   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2570   Arguments::_ClipInlining             = ClipInlining;
2571   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2572 
2573   // Setup flags for mixed which is the default
2574   set_mode_flags(_mixed);
2575 
2576   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2577   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2578   if (result != JNI_OK) {
2579     return result;
2580   }
2581 
2582   // Parse JavaVMInitArgs structure passed in
2583   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2584   if (result != JNI_OK) {
2585     return result;
2586   }
2587 
2588   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2589   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2590   if (result != JNI_OK) {
2591     return result;
2592   }
2593 
2594   // Do final processing now that all arguments have been parsed
2595   result = finalize_vm_init_args(&scp, scp_assembly_required);
2596   if (result != JNI_OK) {
2597     return result;
2598   }
2599 
2600   return JNI_OK;
2601 }
2602 
2603 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2604 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2605 // are dealing with -agentpath (case where name is a path), otherwise with
2606 // -agentlib
2607 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2608   char *_name;
2609   const char *_hprof = "hprof", *_jdwp = "jdwp";
2610   size_t _len_hprof, _len_jdwp, _len_prefix;
2611 
2612   if (is_path) {
2613     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2614       return false;
2615     }
2616 
2617     _name++;  // skip past last path separator
2618     _len_prefix = strlen(JNI_LIB_PREFIX);
2619 
2620     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2621       return false;
2622     }
2623 
2624     _name += _len_prefix;
2625     _len_hprof = strlen(_hprof);
2626     _len_jdwp = strlen(_jdwp);
2627 
2628     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2629       _name += _len_hprof;
2630     }
2631     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2632       _name += _len_jdwp;
2633     }
2634     else {
2635       return false;
2636     }
2637 
2638     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2639       return false;
2640     }
2641 
2642     return true;
2643   }
2644 
2645   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2646     return true;
2647   }
2648 
2649   return false;
2650 }
2651 
2652 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2653                                        SysClassPath* scp_p,
2654                                        bool* scp_assembly_required_p,
2655                                        Flag::Flags origin) {
2656   // Remaining part of option string
2657   const char* tail;
2658 
2659   // iterate over arguments
2660   for (int index = 0; index < args->nOptions; index++) {
2661     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2662 
2663     const JavaVMOption* option = args->options + index;
2664 
2665     if (!match_option(option, "-Djava.class.path", &tail) &&
2666         !match_option(option, "-Dsun.java.command", &tail) &&
2667         !match_option(option, "-Dsun.java.launcher", &tail)) {
2668 
2669         // add all jvm options to the jvm_args string. This string
2670         // is used later to set the java.vm.args PerfData string constant.
2671         // the -Djava.class.path and the -Dsun.java.command options are
2672         // omitted from jvm_args string as each have their own PerfData
2673         // string constant object.
2674         build_jvm_args(option->optionString);
2675     }
2676 
2677     // -verbose:[class/gc/jni]
2678     if (match_option(option, "-verbose", &tail)) {
2679       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2680         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2681         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2682       } else if (!strcmp(tail, ":gc")) {
2683         FLAG_SET_CMDLINE(bool, PrintGC, true);
2684       } else if (!strcmp(tail, ":jni")) {
2685         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2686       }
2687     // -da / -ea / -disableassertions / -enableassertions
2688     // These accept an optional class/package name separated by a colon, e.g.,
2689     // -da:java.lang.Thread.
2690     } else if (match_option(option, user_assertion_options, &tail, true)) {
2691       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2692       if (*tail == '\0') {
2693         JavaAssertions::setUserClassDefault(enable);
2694       } else {
2695         assert(*tail == ':', "bogus match by match_option()");
2696         JavaAssertions::addOption(tail + 1, enable);
2697       }
2698     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2699     } else if (match_option(option, system_assertion_options, &tail, false)) {
2700       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2701       JavaAssertions::setSystemClassDefault(enable);
2702     // -bootclasspath:
2703     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2704       scp_p->reset_path(tail);
2705       *scp_assembly_required_p = true;
2706     // -bootclasspath/a:
2707     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2708       scp_p->add_suffix(tail);
2709       *scp_assembly_required_p = true;
2710     // -bootclasspath/p:
2711     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2712       scp_p->add_prefix(tail);
2713       *scp_assembly_required_p = true;
2714     // -Xrun
2715     } else if (match_option(option, "-Xrun", &tail)) {
2716       if (tail != NULL) {
2717         const char* pos = strchr(tail, ':');
2718         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2719         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2720         name[len] = '\0';
2721 
2722         char *options = NULL;
2723         if(pos != NULL) {
2724           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2725           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2726         }
2727 #if !INCLUDE_JVMTI
2728         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2729           jio_fprintf(defaultStream::error_stream(),
2730             "Profiling and debugging agents are not supported in this VM\n");
2731           return JNI_ERR;
2732         }
2733 #endif // !INCLUDE_JVMTI
2734         add_init_library(name, options);
2735       }
2736     // -agentlib and -agentpath
2737     } else if (match_option(option, "-agentlib:", &tail) ||
2738           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2739       if(tail != NULL) {
2740         const char* pos = strchr(tail, '=');
2741         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2742         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2743         name[len] = '\0';
2744 
2745         char *options = NULL;
2746         if(pos != NULL) {
2747           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2748         }
2749 #if !INCLUDE_JVMTI
2750         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2751           jio_fprintf(defaultStream::error_stream(),
2752             "Profiling and debugging agents are not supported in this VM\n");
2753           return JNI_ERR;
2754         }
2755 #endif // !INCLUDE_JVMTI
2756         add_init_agent(name, options, is_absolute_path);
2757       }
2758     // -javaagent
2759     } else if (match_option(option, "-javaagent:", &tail)) {
2760 #if !INCLUDE_JVMTI
2761       jio_fprintf(defaultStream::error_stream(),
2762         "Instrumentation agents are not supported in this VM\n");
2763       return JNI_ERR;
2764 #else
2765       if(tail != NULL) {
2766         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2767         add_init_agent("instrument", options, false);
2768       }
2769 #endif // !INCLUDE_JVMTI
2770     // -Xnoclassgc
2771     } else if (match_option(option, "-Xnoclassgc")) {
2772       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2773     // -Xconcgc
2774     } else if (match_option(option, "-Xconcgc")) {
2775       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2776     // -Xnoconcgc
2777     } else if (match_option(option, "-Xnoconcgc")) {
2778       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2779     // -Xbatch
2780     } else if (match_option(option, "-Xbatch")) {
2781       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2782     // -Xmn for compatibility with other JVM vendors
2783     } else if (match_option(option, "-Xmn", &tail)) {
2784       julong long_initial_young_size = 0;
2785       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2786       if (errcode != arg_in_range) {
2787         jio_fprintf(defaultStream::error_stream(),
2788                     "Invalid initial young generation size: %s\n", option->optionString);
2789         describe_range_error(errcode);
2790         return JNI_EINVAL;
2791       }
2792       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2793       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2794     // -Xms
2795     } else if (match_option(option, "-Xms", &tail)) {
2796       julong long_initial_heap_size = 0;
2797       // an initial heap size of 0 means automatically determine
2798       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2799       if (errcode != arg_in_range) {
2800         jio_fprintf(defaultStream::error_stream(),
2801                     "Invalid initial heap size: %s\n", option->optionString);
2802         describe_range_error(errcode);
2803         return JNI_EINVAL;
2804       }
2805       set_min_heap_size((uintx)long_initial_heap_size);
2806       // Currently the minimum size and the initial heap sizes are the same.
2807       // Can be overridden with -XX:InitialHeapSize.
2808       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2809     // -Xmx
2810     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2811       julong long_max_heap_size = 0;
2812       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2813       if (errcode != arg_in_range) {
2814         jio_fprintf(defaultStream::error_stream(),
2815                     "Invalid maximum heap size: %s\n", option->optionString);
2816         describe_range_error(errcode);
2817         return JNI_EINVAL;
2818       }
2819       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2820     // Xmaxf
2821     } else if (match_option(option, "-Xmaxf", &tail)) {
2822       char* err;
2823       int maxf = (int)(strtod(tail, &err) * 100);
2824       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2825         jio_fprintf(defaultStream::error_stream(),
2826                     "Bad max heap free percentage size: %s\n",
2827                     option->optionString);
2828         return JNI_EINVAL;
2829       } else {
2830         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2831       }
2832     // Xminf
2833     } else if (match_option(option, "-Xminf", &tail)) {
2834       char* err;
2835       int minf = (int)(strtod(tail, &err) * 100);
2836       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2837         jio_fprintf(defaultStream::error_stream(),
2838                     "Bad min heap free percentage size: %s\n",
2839                     option->optionString);
2840         return JNI_EINVAL;
2841       } else {
2842         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2843       }
2844     // -Xss
2845     } else if (match_option(option, "-Xss", &tail)) {
2846       julong long_ThreadStackSize = 0;
2847       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2848       if (errcode != arg_in_range) {
2849         jio_fprintf(defaultStream::error_stream(),
2850                     "Invalid thread stack size: %s\n", option->optionString);
2851         describe_range_error(errcode);
2852         return JNI_EINVAL;
2853       }
2854       // Internally track ThreadStackSize in units of 1024 bytes.
2855       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2856                               round_to((int)long_ThreadStackSize, K) / K);
2857     // -Xoss
2858     } else if (match_option(option, "-Xoss", &tail)) {
2859           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2860     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2861       julong long_CodeCacheExpansionSize = 0;
2862       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2863       if (errcode != arg_in_range) {
2864         jio_fprintf(defaultStream::error_stream(),
2865                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2866                    os::vm_page_size()/K);
2867         return JNI_EINVAL;
2868       }
2869       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2870     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2871                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2872       julong long_ReservedCodeCacheSize = 0;
2873 
2874       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2875       if (errcode != arg_in_range) {
2876         jio_fprintf(defaultStream::error_stream(),
2877                     "Invalid maximum code cache size: %s.\n", option->optionString);
2878         return JNI_EINVAL;
2879       }
2880       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2881       // -XX:NonNMethodCodeHeapSize=
2882     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2883       julong long_NonNMethodCodeHeapSize = 0;
2884 
2885       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2886       if (errcode != arg_in_range) {
2887         jio_fprintf(defaultStream::error_stream(),
2888                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2889         return JNI_EINVAL;
2890       }
2891       FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2892       // -XX:ProfiledCodeHeapSize=
2893     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2894       julong long_ProfiledCodeHeapSize = 0;
2895 
2896       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2897       if (errcode != arg_in_range) {
2898         jio_fprintf(defaultStream::error_stream(),
2899                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2900         return JNI_EINVAL;
2901       }
2902       FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2903       // -XX:NonProfiledCodeHeapSizee=
2904     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2905       julong long_NonProfiledCodeHeapSize = 0;
2906 
2907       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2908       if (errcode != arg_in_range) {
2909         jio_fprintf(defaultStream::error_stream(),
2910                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2911         return JNI_EINVAL;
2912       }
2913       FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2914       //-XX:IncreaseFirstTierCompileThresholdAt=
2915     } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2916         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2917         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2918           jio_fprintf(defaultStream::error_stream(),
2919                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2920                       option->optionString);
2921           return JNI_EINVAL;
2922         }
2923         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2924     // -green
2925     } else if (match_option(option, "-green")) {
2926       jio_fprintf(defaultStream::error_stream(),
2927                   "Green threads support not available\n");
2928           return JNI_EINVAL;
2929     // -native
2930     } else if (match_option(option, "-native")) {
2931           // HotSpot always uses native threads, ignore silently for compatibility
2932     // -Xsqnopause
2933     } else if (match_option(option, "-Xsqnopause")) {
2934           // EVM option, ignore silently for compatibility
2935     // -Xrs
2936     } else if (match_option(option, "-Xrs")) {
2937           // Classic/EVM option, new functionality
2938       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2939     } else if (match_option(option, "-Xusealtsigs")) {
2940           // change default internal VM signals used - lower case for back compat
2941       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2942     // -Xoptimize
2943     } else if (match_option(option, "-Xoptimize")) {
2944           // EVM option, ignore silently for compatibility
2945     // -Xprof
2946     } else if (match_option(option, "-Xprof")) {
2947 #if INCLUDE_FPROF
2948       _has_profile = true;
2949 #else // INCLUDE_FPROF
2950       jio_fprintf(defaultStream::error_stream(),
2951         "Flat profiling is not supported in this VM.\n");
2952       return JNI_ERR;
2953 #endif // INCLUDE_FPROF
2954     // -Xconcurrentio
2955     } else if (match_option(option, "-Xconcurrentio")) {
2956       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2957       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2958       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2959       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2960       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2961 
2962       // -Xinternalversion
2963     } else if (match_option(option, "-Xinternalversion")) {
2964       jio_fprintf(defaultStream::output_stream(), "%s\n",
2965                   VM_Version::internal_vm_info_string());
2966       vm_exit(0);
2967 #ifndef PRODUCT
2968     // -Xprintflags
2969     } else if (match_option(option, "-Xprintflags")) {
2970       CommandLineFlags::printFlags(tty, false);
2971       vm_exit(0);
2972 #endif
2973     // -D
2974     } else if (match_option(option, "-D", &tail)) {
2975       const char* value;
2976       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2977             *value!= '\0' && strcmp(value, "\"\"") != 0) {
2978         // abort if -Djava.endorsed.dirs is set
2979         jio_fprintf(defaultStream::output_stream(),
2980           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2981           "in modular form will be supported via the concept of upgradeable modules.\n", value);
2982         return JNI_EINVAL;
2983       }
2984       if (match_option(option, "-Djava.ext.dirs=", &value) &&
2985             *value != '\0' && strcmp(value, "\"\"") != 0) {
2986         // abort if -Djava.ext.dirs is set
2987         jio_fprintf(defaultStream::output_stream(),
2988           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
2989         return JNI_EINVAL;
2990       }
2991 
2992       if (!add_property(tail)) {
2993         return JNI_ENOMEM;
2994       }
2995       // Out of the box management support
2996       if (match_option(option, "-Dcom.sun.management", &tail)) {
2997 #if INCLUDE_MANAGEMENT
2998         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2999 #else
3000         jio_fprintf(defaultStream::output_stream(),
3001           "-Dcom.sun.management is not supported in this VM.\n");
3002         return JNI_ERR;
3003 #endif
3004       }
3005     // -Xint
3006     } else if (match_option(option, "-Xint")) {
3007           set_mode_flags(_int);
3008     // -Xmixed
3009     } else if (match_option(option, "-Xmixed")) {
3010           set_mode_flags(_mixed);
3011     // -Xcomp
3012     } else if (match_option(option, "-Xcomp")) {
3013       // for testing the compiler; turn off all flags that inhibit compilation
3014           set_mode_flags(_comp);
3015     // -Xshare:dump
3016     } else if (match_option(option, "-Xshare:dump")) {
3017       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3018       set_mode_flags(_int);     // Prevent compilation, which creates objects
3019     // -Xshare:on
3020     } else if (match_option(option, "-Xshare:on")) {
3021       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3022       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3023     // -Xshare:auto
3024     } else if (match_option(option, "-Xshare:auto")) {
3025       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3026       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3027     // -Xshare:off
3028     } else if (match_option(option, "-Xshare:off")) {
3029       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3030       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3031     // -Xverify
3032     } else if (match_option(option, "-Xverify", &tail)) {
3033       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3034         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3035         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3036       } else if (strcmp(tail, ":remote") == 0) {
3037         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3038         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3039       } else if (strcmp(tail, ":none") == 0) {
3040         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3041         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3042       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3043         return JNI_EINVAL;
3044       }
3045     // -Xdebug
3046     } else if (match_option(option, "-Xdebug")) {
3047       // note this flag has been used, then ignore
3048       set_xdebug_mode(true);
3049     // -Xnoagent
3050     } else if (match_option(option, "-Xnoagent")) {
3051       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3052     } else if (match_option(option, "-Xboundthreads")) {
3053       // Bind user level threads to kernel threads (Solaris only)
3054       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3055     } else if (match_option(option, "-Xloggc:", &tail)) {
3056       // Redirect GC output to the file. -Xloggc:<filename>
3057       // ostream_init_log(), when called will use this filename
3058       // to initialize a fileStream.
3059       _gc_log_filename = os::strdup_check_oom(tail);
3060      if (!is_filename_valid(_gc_log_filename)) {
3061        jio_fprintf(defaultStream::output_stream(),
3062                   "Invalid file name for use with -Xloggc: Filename can only contain the "
3063                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3064                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
3065         return JNI_EINVAL;
3066       }
3067       FLAG_SET_CMDLINE(bool, PrintGC, true);
3068       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3069 
3070     // JNI hooks
3071     } else if (match_option(option, "-Xcheck", &tail)) {
3072       if (!strcmp(tail, ":jni")) {
3073 #if !INCLUDE_JNI_CHECK
3074         warning("JNI CHECKING is not supported in this VM");
3075 #else
3076         CheckJNICalls = true;
3077 #endif // INCLUDE_JNI_CHECK
3078       } else if (is_bad_option(option, args->ignoreUnrecognized,
3079                                      "check")) {
3080         return JNI_EINVAL;
3081       }
3082     } else if (match_option(option, "vfprintf")) {
3083       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3084     } else if (match_option(option, "exit")) {
3085       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3086     } else if (match_option(option, "abort")) {
3087       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3088     // -XX:+AggressiveHeap
3089     } else if (match_option(option, "-XX:+AggressiveHeap")) {
3090 
3091       // This option inspects the machine and attempts to set various
3092       // parameters to be optimal for long-running, memory allocation
3093       // intensive jobs.  It is intended for machines with large
3094       // amounts of cpu and memory.
3095 
3096       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3097       // VM, but we may not be able to represent the total physical memory
3098       // available (like having 8gb of memory on a box but using a 32bit VM).
3099       // Thus, we need to make sure we're using a julong for intermediate
3100       // calculations.
3101       julong initHeapSize;
3102       julong total_memory = os::physical_memory();
3103 
3104       if (total_memory < (julong)256*M) {
3105         jio_fprintf(defaultStream::error_stream(),
3106                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3107         vm_exit(1);
3108       }
3109 
3110       // The heap size is half of available memory, or (at most)
3111       // all of possible memory less 160mb (leaving room for the OS
3112       // when using ISM).  This is the maximum; because adaptive sizing
3113       // is turned on below, the actual space used may be smaller.
3114 
3115       initHeapSize = MIN2(total_memory / (julong)2,
3116                           total_memory - (julong)160*M);
3117 
3118       initHeapSize = limit_by_allocatable_memory(initHeapSize);
3119 
3120       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3121          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3122          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3123          // Currently the minimum size and the initial heap sizes are the same.
3124          set_min_heap_size(initHeapSize);
3125       }
3126       if (FLAG_IS_DEFAULT(NewSize)) {
3127          // Make the young generation 3/8ths of the total heap.
3128          FLAG_SET_CMDLINE(uintx, NewSize,
3129                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3130          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3131       }
3132 
3133 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3134       FLAG_SET_DEFAULT(UseLargePages, true);
3135 #endif
3136 
3137       // Increase some data structure sizes for efficiency
3138       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3139       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3140       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3141 
3142       // See the OldPLABSize comment below, but replace 'after promotion'
3143       // with 'after copying'.  YoungPLABSize is the size of the survivor
3144       // space per-gc-thread buffers.  The default is 4kw.
3145       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
3146 
3147       // OldPLABSize is the size of the buffers in the old gen that
3148       // UseParallelGC uses to promote live data that doesn't fit in the
3149       // survivor spaces.  At any given time, there's one for each gc thread.
3150       // The default size is 1kw. These buffers are rarely used, since the
3151       // survivor spaces are usually big enough.  For specjbb, however, there
3152       // are occasions when there's lots of live data in the young gen
3153       // and we end up promoting some of it.  We don't have a definite
3154       // explanation for why bumping OldPLABSize helps, but the theory
3155       // is that a bigger PLAB results in retaining something like the
3156       // original allocation order after promotion, which improves mutator
3157       // locality.  A minor effect may be that larger PLABs reduce the
3158       // number of PLAB allocation events during gc.  The value of 8kw
3159       // was arrived at by experimenting with specjbb.
3160       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
3161 
3162       // Enable parallel GC and adaptive generation sizing
3163       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3164       FLAG_SET_DEFAULT(ParallelGCThreads,
3165                        Abstract_VM_Version::parallel_worker_threads());
3166 
3167       // Encourage steady state memory management
3168       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3169 
3170       // This appears to improve mutator locality
3171       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3172 
3173       // Get around early Solaris scheduling bug
3174       // (affinity vs other jobs on system)
3175       // but disallow DR and offlining (5008695).
3176       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3177 
3178     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3179     // and the last option wins.
3180     } else if (match_option(option, "-XX:+NeverTenure")) {
3181       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3182       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3183       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3184     } else if (match_option(option, "-XX:+AlwaysTenure")) {
3185       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3186       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3187       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3188     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3189       uintx max_tenuring_thresh = 0;
3190       if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3191         jio_fprintf(defaultStream::error_stream(),
3192                     "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3193       }
3194       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3195 
3196       if (MaxTenuringThreshold == 0) {
3197         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3198         FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3199       } else {
3200         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3201         FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3202       }
3203     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3204       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3205       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3206     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3207       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3208       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3209     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3210 #if defined(DTRACE_ENABLED)
3211       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3212       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3213       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3214       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3215 #else // defined(DTRACE_ENABLED)
3216       jio_fprintf(defaultStream::error_stream(),
3217                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3218       return JNI_EINVAL;
3219 #endif // defined(DTRACE_ENABLED)
3220 #ifdef ASSERT
3221     } else if (match_option(option, "-XX:+FullGCALot")) {
3222       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3223       // disable scavenge before parallel mark-compact
3224       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3225 #endif
3226     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3227                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3228       julong stack_size = 0;
3229       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3230       if (errcode != arg_in_range) {
3231         jio_fprintf(defaultStream::error_stream(),
3232                     "Invalid mark stack size: %s\n", option->optionString);
3233         describe_range_error(errcode);
3234         return JNI_EINVAL;
3235       }
3236       jio_fprintf(defaultStream::error_stream(),
3237         "Please use -XX:MarkStackSize in place of "
3238         "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3239       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3240     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3241       julong max_stack_size = 0;
3242       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3243       if (errcode != arg_in_range) {
3244         jio_fprintf(defaultStream::error_stream(),
3245                     "Invalid maximum mark stack size: %s\n",
3246                     option->optionString);
3247         describe_range_error(errcode);
3248         return JNI_EINVAL;
3249       }
3250       jio_fprintf(defaultStream::error_stream(),
3251          "Please use -XX:MarkStackSizeMax in place of "
3252          "-XX:CMSMarkStackSizeMax in the future\n");
3253       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3254     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3255                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3256       uintx conc_threads = 0;
3257       if (!parse_uintx(tail, &conc_threads, 1)) {
3258         jio_fprintf(defaultStream::error_stream(),
3259                     "Invalid concurrent threads: %s\n", option->optionString);
3260         return JNI_EINVAL;
3261       }
3262       jio_fprintf(defaultStream::error_stream(),
3263         "Please use -XX:ConcGCThreads in place of "
3264         "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3265       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3266     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3267       julong max_direct_memory_size = 0;
3268       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3269       if (errcode != arg_in_range) {
3270         jio_fprintf(defaultStream::error_stream(),
3271                     "Invalid maximum direct memory size: %s\n",
3272                     option->optionString);
3273         describe_range_error(errcode);
3274         return JNI_EINVAL;
3275       }
3276       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3277 #if !INCLUDE_MANAGEMENT
3278     } else if (match_option(option, "-XX:+ManagementServer")) {
3279         jio_fprintf(defaultStream::error_stream(),
3280           "ManagementServer is not supported in this VM.\n");
3281         return JNI_ERR;
3282 #endif // INCLUDE_MANAGEMENT
3283     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3284       // Skip -XX:Flags= since that case has already been handled
3285       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3286         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3287           return JNI_EINVAL;
3288         }
3289       }
3290     // Unknown option
3291     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3292       return JNI_ERR;
3293     }
3294   }
3295 
3296   // PrintSharedArchiveAndExit will turn on
3297   //   -Xshare:on
3298   //   -XX:+TraceClassPaths
3299   if (PrintSharedArchiveAndExit) {
3300     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3301     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3302     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3303   }
3304 
3305   // Change the default value for flags  which have different default values
3306   // when working with older JDKs.
3307 #ifdef LINUX
3308  if (JDK_Version::current().compare_major(6) <= 0 &&
3309       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3310     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3311   }
3312 #endif // LINUX
3313   fix_appclasspath();
3314   return JNI_OK;
3315 }
3316 
3317 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3318 //
3319 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3320 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3321 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3322 // path is treated as the current directory.
3323 //
3324 // This causes problems with CDS, which requires that all directories specified in the classpath
3325 // must be empty. In most cases, applications do NOT want to load classes from the current
3326 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3327 // scripts compatible with CDS.
3328 void Arguments::fix_appclasspath() {
3329   if (IgnoreEmptyClassPaths) {
3330     const char separator = *os::path_separator();
3331     const char* src = _java_class_path->value();
3332 
3333     // skip over all the leading empty paths
3334     while (*src == separator) {
3335       src ++;
3336     }
3337 
3338     char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3339     strncpy(copy, src, strlen(src) + 1);
3340 
3341     // trim all trailing empty paths
3342     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3343       *tail = '\0';
3344     }
3345 
3346     char from[3] = {separator, separator, '\0'};
3347     char to  [2] = {separator, '\0'};
3348     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3349       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3350       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3351     }
3352 
3353     _java_class_path->set_value(copy);
3354     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3355   }
3356 
3357   if (!PrintSharedArchiveAndExit) {
3358     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3359   }
3360 }
3361 
3362 static bool has_jar_files(const char* directory) {
3363   DIR* dir = os::opendir(directory);
3364   if (dir == NULL) return false;
3365 
3366   struct dirent *entry;
3367   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3368   bool hasJarFile = false;
3369   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3370     const char* name = entry->d_name;
3371     const char* ext = name + strlen(name) - 4;
3372     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3373   }
3374   FREE_C_HEAP_ARRAY(char, dbuf);
3375   os::closedir(dir);
3376   return hasJarFile ;
3377 }
3378 
3379 static int check_non_empty_dirs(const char* path) {
3380   const char separator = *os::path_separator();
3381   const char* const end = path + strlen(path);
3382   int nonEmptyDirs = 0;
3383   while (path < end) {
3384     const char* tmp_end = strchr(path, separator);
3385     if (tmp_end == NULL) {
3386       if (has_jar_files(path)) {
3387         nonEmptyDirs++;
3388         jio_fprintf(defaultStream::output_stream(),
3389           "Non-empty directory: %s\n", path);
3390       }
3391       path = end;
3392     } else {
3393       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3394       memcpy(dirpath, path, tmp_end - path);
3395       dirpath[tmp_end - path] = '\0';
3396       if (has_jar_files(dirpath)) {
3397         nonEmptyDirs++;
3398         jio_fprintf(defaultStream::output_stream(),
3399           "Non-empty directory: %s\n", dirpath);
3400       }
3401       FREE_C_HEAP_ARRAY(char, dirpath);
3402       path = tmp_end + 1;
3403     }
3404   }
3405   return nonEmptyDirs;
3406 }
3407 
3408 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3409   // check if the default lib/endorsed directory exists; if so, error
3410   char path[JVM_MAXPATHLEN];
3411   const char* fileSep = os::file_separator();
3412   sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3413 
3414   if (CheckEndorsedAndExtDirs) {
3415     int nonEmptyDirs = 0;
3416     // check endorsed directory
3417     nonEmptyDirs += check_non_empty_dirs(path);
3418     // check the extension directories
3419     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3420     if (nonEmptyDirs > 0) {
3421       return JNI_ERR;
3422     }
3423   }
3424 
3425   DIR* dir = os::opendir(path);
3426   if (dir != NULL) {
3427     jio_fprintf(defaultStream::output_stream(),
3428       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3429       "in modular form will be supported via the concept of upgradeable modules.\n");
3430     os::closedir(dir);
3431     return JNI_ERR;
3432   }
3433 
3434   sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3435   dir = os::opendir(path);
3436   if (dir != NULL) {
3437     jio_fprintf(defaultStream::output_stream(),
3438       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3439       "Use -classpath instead.\n.");
3440     os::closedir(dir);
3441     return JNI_ERR;
3442   }
3443 
3444   if (scp_assembly_required) {
3445     // Assemble the bootclasspath elements into the final path.
3446     Arguments::set_sysclasspath(scp_p->combined_path());
3447   }
3448 
3449   // This must be done after all arguments have been processed.
3450   // java_compiler() true means set to "NONE" or empty.
3451   if (java_compiler() && !xdebug_mode()) {
3452     // For backwards compatibility, we switch to interpreted mode if
3453     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3454     // not specified.
3455     set_mode_flags(_int);
3456   }
3457 
3458   if ((TieredCompilation && CompileThresholdScaling == 0)
3459       || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) {
3460     set_mode_flags(_int);
3461   }
3462 
3463   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3464   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3465     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3466   }
3467 
3468 #ifndef COMPILER2
3469   // Don't degrade server performance for footprint
3470   if (FLAG_IS_DEFAULT(UseLargePages) &&
3471       MaxHeapSize < LargePageHeapSizeThreshold) {
3472     // No need for large granularity pages w/small heaps.
3473     // Note that large pages are enabled/disabled for both the
3474     // Java heap and the code cache.
3475     FLAG_SET_DEFAULT(UseLargePages, false);
3476   }
3477 
3478 #else
3479   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3480     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3481   }
3482 #endif
3483 
3484 #ifndef TIERED
3485   // Tiered compilation is undefined.
3486   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3487 #endif
3488 
3489   // If we are running in a headless jre, force java.awt.headless property
3490   // to be true unless the property has already been set.
3491   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3492   if (os::is_headless_jre()) {
3493     const char* headless = Arguments::get_property("java.awt.headless");
3494     if (headless == NULL) {
3495       char envbuffer[128];
3496       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3497         if (!add_property("java.awt.headless=true")) {
3498           return JNI_ENOMEM;
3499         }
3500       } else {
3501         char buffer[256];
3502         strcpy(buffer, "java.awt.headless=");
3503         strcat(buffer, envbuffer);
3504         if (!add_property(buffer)) {
3505           return JNI_ENOMEM;
3506         }
3507       }
3508     }
3509   }
3510 
3511   if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3512     // CMS can only be used with ParNew
3513     FLAG_SET_ERGO(bool, UseParNewGC, true);
3514   }
3515 
3516   if (!check_vm_args_consistency()) {
3517     return JNI_ERR;
3518   }
3519 
3520   return JNI_OK;
3521 }
3522 
3523 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3524   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3525                                             scp_assembly_required_p);
3526 }
3527 
3528 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3529   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3530                                             scp_assembly_required_p);
3531 }
3532 
3533 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3534   const int N_MAX_OPTIONS = 64;
3535   const int OPTION_BUFFER_SIZE = 1024;
3536   char buffer[OPTION_BUFFER_SIZE];
3537 
3538   // The variable will be ignored if it exceeds the length of the buffer.
3539   // Don't check this variable if user has special privileges
3540   // (e.g. unix su command).
3541   if (os::getenv(name, buffer, sizeof(buffer)) &&
3542       !os::have_special_privileges()) {
3543     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3544     jio_fprintf(defaultStream::error_stream(),
3545                 "Picked up %s: %s\n", name, buffer);
3546     char* rd = buffer;                        // pointer to the input string (rd)
3547     int i;
3548     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3549       while (isspace(*rd)) rd++;              // skip whitespace
3550       if (*rd == 0) break;                    // we re done when the input string is read completely
3551 
3552       // The output, option string, overwrites the input string.
3553       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3554       // input string (rd).
3555       char* wrt = rd;
3556 
3557       options[i++].optionString = wrt;        // Fill in option
3558       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3559         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3560           int quote = *rd;                    // matching quote to look for
3561           rd++;                               // don't copy open quote
3562           while (*rd != quote) {              // include everything (even spaces) up until quote
3563             if (*rd == 0) {                   // string termination means unmatched string
3564               jio_fprintf(defaultStream::error_stream(),
3565                           "Unmatched quote in %s\n", name);
3566               return JNI_ERR;
3567             }
3568             *wrt++ = *rd++;                   // copy to option string
3569           }
3570           rd++;                               // don't copy close quote
3571         } else {
3572           *wrt++ = *rd++;                     // copy to option string
3573         }
3574       }
3575       // Need to check if we're done before writing a NULL,
3576       // because the write could be to the byte that rd is pointing to.
3577       if (*rd++ == 0) {
3578         *wrt = 0;
3579         break;
3580       }
3581       *wrt = 0;                               // Zero terminate option
3582     }
3583     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3584     JavaVMInitArgs vm_args;
3585     vm_args.version = JNI_VERSION_1_2;
3586     vm_args.options = options;
3587     vm_args.nOptions = i;
3588     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3589 
3590     if (PrintVMOptions) {
3591       const char* tail;
3592       for (int i = 0; i < vm_args.nOptions; i++) {
3593         const JavaVMOption *option = vm_args.options + i;
3594         if (match_option(option, "-XX:", &tail)) {
3595           logOption(tail);
3596         }
3597       }
3598     }
3599 
3600     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3601   }
3602   return JNI_OK;
3603 }
3604 
3605 void Arguments::set_shared_spaces_flags() {
3606   if (DumpSharedSpaces) {
3607     if (RequireSharedSpaces) {
3608       warning("cannot dump shared archive while using shared archive");
3609     }
3610     UseSharedSpaces = false;
3611 #ifdef _LP64
3612     if (!UseCompressedOops || !UseCompressedClassPointers) {
3613       vm_exit_during_initialization(
3614         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3615     }
3616   } else {
3617     if (!UseCompressedOops || !UseCompressedClassPointers) {
3618       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3619     }
3620 #endif
3621   }
3622 }
3623 
3624 #if !INCLUDE_ALL_GCS
3625 static void force_serial_gc() {
3626   FLAG_SET_DEFAULT(UseSerialGC, true);
3627   UNSUPPORTED_GC_OPTION(UseG1GC);
3628   UNSUPPORTED_GC_OPTION(UseParallelGC);
3629   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3630   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3631   UNSUPPORTED_GC_OPTION(UseParNewGC);
3632 }
3633 #endif // INCLUDE_ALL_GCS
3634 
3635 // Sharing support
3636 // Construct the path to the archive
3637 static char* get_shared_archive_path() {
3638   char *shared_archive_path;
3639   if (SharedArchiveFile == NULL) {
3640     char jvm_path[JVM_MAXPATHLEN];
3641     os::jvm_path(jvm_path, sizeof(jvm_path));
3642     char *end = strrchr(jvm_path, *os::file_separator());
3643     if (end != NULL) *end = '\0';
3644     size_t jvm_path_len = strlen(jvm_path);
3645     size_t file_sep_len = strlen(os::file_separator());
3646     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3647         file_sep_len + 20, mtInternal);
3648     if (shared_archive_path != NULL) {
3649       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3650       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3651       strncat(shared_archive_path, "classes.jsa", 11);
3652     }
3653   } else {
3654     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3655     if (shared_archive_path != NULL) {
3656       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3657     }
3658   }
3659   return shared_archive_path;
3660 }
3661 
3662 #ifndef PRODUCT
3663 // Determine whether LogVMOutput should be implicitly turned on.
3664 static bool use_vm_log() {
3665   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3666       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3667       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3668       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3669       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3670     return true;
3671   }
3672 
3673 #ifdef COMPILER1
3674   if (PrintC1Statistics) {
3675     return true;
3676   }
3677 #endif // COMPILER1
3678 
3679 #ifdef COMPILER2
3680   if (PrintOptoAssembly || PrintOptoStatistics) {
3681     return true;
3682   }
3683 #endif // COMPILER2
3684 
3685   return false;
3686 }
3687 #endif // PRODUCT
3688 
3689 // Parse entry point called from JNI_CreateJavaVM
3690 
3691 jint Arguments::parse(const JavaVMInitArgs* args) {
3692 
3693   // Remaining part of option string
3694   const char* tail;
3695 
3696   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3697   const char* hotspotrc = ".hotspotrc";
3698   bool settings_file_specified = false;
3699   bool needs_hotspotrc_warning = false;
3700 
3701   const char* flags_file;
3702   int index;
3703   for (index = 0; index < args->nOptions; index++) {
3704     const JavaVMOption *option = args->options + index;
3705     if (ArgumentsExt::process_options(option)) {
3706       continue;
3707     }
3708     if (match_option(option, "-XX:Flags=", &tail)) {
3709       flags_file = tail;
3710       settings_file_specified = true;
3711       continue;
3712     }
3713     if (match_option(option, "-XX:+PrintVMOptions")) {
3714       PrintVMOptions = true;
3715       continue;
3716     }
3717     if (match_option(option, "-XX:-PrintVMOptions")) {
3718       PrintVMOptions = false;
3719       continue;
3720     }
3721     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3722       IgnoreUnrecognizedVMOptions = true;
3723       continue;
3724     }
3725     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3726       IgnoreUnrecognizedVMOptions = false;
3727       continue;
3728     }
3729     if (match_option(option, "-XX:+PrintFlagsInitial")) {
3730       CommandLineFlags::printFlags(tty, false);
3731       vm_exit(0);
3732     }
3733 #if INCLUDE_NMT
3734     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3735       // The launcher did not setup nmt environment variable properly.
3736       if (!MemTracker::check_launcher_nmt_support(tail)) {
3737         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3738       }
3739 
3740       // Verify if nmt option is valid.
3741       if (MemTracker::verify_nmt_option()) {
3742         // Late initialization, still in single-threaded mode.
3743         if (MemTracker::tracking_level() >= NMT_summary) {
3744           MemTracker::init();
3745         }
3746       } else {
3747         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3748       }
3749       continue;
3750     }
3751 #endif
3752 
3753 
3754 #ifndef PRODUCT
3755     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3756       CommandLineFlags::printFlags(tty, true);
3757       vm_exit(0);
3758     }
3759 #endif
3760   }
3761 
3762   if (IgnoreUnrecognizedVMOptions) {
3763     // uncast const to modify the flag args->ignoreUnrecognized
3764     *(jboolean*)(&args->ignoreUnrecognized) = true;
3765   }
3766 
3767   // Parse specified settings file
3768   if (settings_file_specified) {
3769     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3770       return JNI_EINVAL;
3771     }
3772   } else {
3773 #ifdef ASSERT
3774     // Parse default .hotspotrc settings file
3775     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3776       return JNI_EINVAL;
3777     }
3778 #else
3779     struct stat buf;
3780     if (os::stat(hotspotrc, &buf) == 0) {
3781       needs_hotspotrc_warning = true;
3782     }
3783 #endif
3784   }
3785 
3786   if (PrintVMOptions) {
3787     for (index = 0; index < args->nOptions; index++) {
3788       const JavaVMOption *option = args->options + index;
3789       if (match_option(option, "-XX:", &tail)) {
3790         logOption(tail);
3791       }
3792     }
3793   }
3794 
3795   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3796   jint result = parse_vm_init_args(args);
3797   if (result != JNI_OK) {
3798     return result;
3799   }
3800 
3801   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3802   SharedArchivePath = get_shared_archive_path();
3803   if (SharedArchivePath == NULL) {
3804     return JNI_ENOMEM;
3805   }
3806 
3807   // Set up VerifySharedSpaces
3808   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3809     VerifySharedSpaces = true;
3810   }
3811 
3812   // Delay warning until here so that we've had a chance to process
3813   // the -XX:-PrintWarnings flag
3814   if (needs_hotspotrc_warning) {
3815     warning("%s file is present but has been ignored.  "
3816             "Run with -XX:Flags=%s to load the file.",
3817             hotspotrc, hotspotrc);
3818   }
3819 
3820 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3821   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3822 #endif
3823 
3824 #if INCLUDE_ALL_GCS
3825   #if (defined JAVASE_EMBEDDED || defined ARM)
3826     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3827   #endif
3828 #endif
3829 
3830 #ifndef PRODUCT
3831   if (TraceBytecodesAt != 0) {
3832     TraceBytecodes = true;
3833   }
3834   if (CountCompiledCalls) {
3835     if (UseCounterDecay) {
3836       warning("UseCounterDecay disabled because CountCalls is set");
3837       UseCounterDecay = false;
3838     }
3839   }
3840 #endif // PRODUCT
3841 
3842   if (ScavengeRootsInCode == 0) {
3843     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3844       warning("forcing ScavengeRootsInCode non-zero");
3845     }
3846     ScavengeRootsInCode = 1;
3847   }
3848 
3849   if (PrintGCDetails) {
3850     // Turn on -verbose:gc options as well
3851     PrintGC = true;
3852   }
3853 
3854   // Set object alignment values.
3855   set_object_alignment();
3856 
3857 #if !INCLUDE_ALL_GCS
3858   force_serial_gc();
3859 #endif // INCLUDE_ALL_GCS
3860 #if !INCLUDE_CDS
3861   if (DumpSharedSpaces || RequireSharedSpaces) {
3862     jio_fprintf(defaultStream::error_stream(),
3863       "Shared spaces are not supported in this VM\n");
3864     return JNI_ERR;
3865   }
3866   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3867     warning("Shared spaces are not supported in this VM");
3868     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3869     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3870   }
3871   no_shared_spaces("CDS Disabled");
3872 #endif // INCLUDE_CDS
3873 
3874   return JNI_OK;
3875 }
3876 
3877 jint Arguments::apply_ergo() {
3878 
3879   // Set flags based on ergonomics.
3880   set_ergonomics_flags();
3881 
3882   set_shared_spaces_flags();
3883 
3884   // Check the GC selections again.
3885   if (!ArgumentsExt::check_gc_consistency_ergo()) {
3886     return JNI_EINVAL;
3887   }
3888 
3889   if (TieredCompilation) {
3890     set_tiered_flags();
3891   } else {
3892     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3893     if (CompilationPolicyChoice >= 2) {
3894       vm_exit_during_initialization(
3895         "Incompatible compilation policy selected", NULL);
3896     }
3897     // Scale CompileThreshold
3898     if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) {
3899       FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold));
3900     }
3901   }
3902 
3903 #ifdef COMPILER2
3904 #ifndef PRODUCT
3905   if (PrintIdealGraphLevel > 0) {
3906     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3907   }
3908 #endif
3909 #endif
3910 
3911   // Set heap size based on available physical memory
3912   set_heap_size();
3913 
3914   ArgumentsExt::set_gc_specific_flags();
3915 
3916   // Initialize Metaspace flags and alignments
3917   Metaspace::ergo_initialize();
3918 
3919   // Set bytecode rewriting flags
3920   set_bytecode_flags();
3921 
3922   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3923   set_aggressive_opts_flags();
3924 
3925   // Turn off biased locking for locking debug mode flags,
3926   // which are subtly different from each other but neither works with
3927   // biased locking
3928   if (UseHeavyMonitors
3929 #ifdef COMPILER1
3930       || !UseFastLocking
3931 #endif // COMPILER1
3932     ) {
3933     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3934       // flag set to true on command line; warn the user that they
3935       // can't enable biased locking here
3936       warning("Biased Locking is not supported with locking debug flags"
3937               "; ignoring UseBiasedLocking flag." );
3938     }
3939     UseBiasedLocking = false;
3940   }
3941 
3942 #ifdef ZERO
3943   // Clear flags not supported on zero.
3944   FLAG_SET_DEFAULT(ProfileInterpreter, false);
3945   FLAG_SET_DEFAULT(UseBiasedLocking, false);
3946   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3947   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3948 #endif // CC_INTERP
3949 
3950 #ifdef COMPILER2
3951   if (!EliminateLocks) {
3952     EliminateNestedLocks = false;
3953   }
3954   if (!Inline) {
3955     IncrementalInline = false;
3956   }
3957 #ifndef PRODUCT
3958   if (!IncrementalInline) {
3959     AlwaysIncrementalInline = false;
3960   }
3961 #endif
3962   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3963     // nothing to use the profiling, turn if off
3964     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3965   }
3966 #endif
3967 
3968   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3969     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3970     DebugNonSafepoints = true;
3971   }
3972 
3973   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3974     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3975   }
3976 
3977 #ifndef PRODUCT
3978   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3979     if (use_vm_log()) {
3980       LogVMOutput = true;
3981     }
3982   }
3983 #endif // PRODUCT
3984 
3985   if (PrintCommandLineFlags) {
3986     CommandLineFlags::printSetFlags(tty);
3987   }
3988 
3989   // Apply CPU specific policy for the BiasedLocking
3990   if (UseBiasedLocking) {
3991     if (!VM_Version::use_biased_locking() &&
3992         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3993       UseBiasedLocking = false;
3994     }
3995   }
3996 #ifdef COMPILER2
3997   if (!UseBiasedLocking || EmitSync != 0) {
3998     UseOptoBiasInlining = false;
3999   }
4000 #endif
4001 
4002   return JNI_OK;
4003 }
4004 
4005 jint Arguments::adjust_after_os() {
4006   if (UseNUMA) {
4007     if (UseParallelGC || UseParallelOldGC) {
4008       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4009          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4010       }
4011     }
4012     // UseNUMAInterleaving is set to ON for all collectors and
4013     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4014     // such as the parallel collector for Linux and Solaris will
4015     // interleave old gen and survivor spaces on top of NUMA
4016     // allocation policy for the eden space.
4017     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4018     // all platforms and ParallelGC on Windows will interleave all
4019     // of the heap spaces across NUMA nodes.
4020     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4021       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4022     }
4023   }
4024   return JNI_OK;
4025 }
4026 
4027 int Arguments::PropertyList_count(SystemProperty* pl) {
4028   int count = 0;
4029   while(pl != NULL) {
4030     count++;
4031     pl = pl->next();
4032   }
4033   return count;
4034 }
4035 
4036 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4037   assert(key != NULL, "just checking");
4038   SystemProperty* prop;
4039   for (prop = pl; prop != NULL; prop = prop->next()) {
4040     if (strcmp(key, prop->key()) == 0) return prop->value();
4041   }
4042   return NULL;
4043 }
4044 
4045 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4046   int count = 0;
4047   const char* ret_val = NULL;
4048 
4049   while(pl != NULL) {
4050     if(count >= index) {
4051       ret_val = pl->key();
4052       break;
4053     }
4054     count++;
4055     pl = pl->next();
4056   }
4057 
4058   return ret_val;
4059 }
4060 
4061 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4062   int count = 0;
4063   char* ret_val = NULL;
4064 
4065   while(pl != NULL) {
4066     if(count >= index) {
4067       ret_val = pl->value();
4068       break;
4069     }
4070     count++;
4071     pl = pl->next();
4072   }
4073 
4074   return ret_val;
4075 }
4076 
4077 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4078   SystemProperty* p = *plist;
4079   if (p == NULL) {
4080     *plist = new_p;
4081   } else {
4082     while (p->next() != NULL) {
4083       p = p->next();
4084     }
4085     p->set_next(new_p);
4086   }
4087 }
4088 
4089 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4090   if (plist == NULL)
4091     return;
4092 
4093   SystemProperty* new_p = new SystemProperty(k, v, true);
4094   PropertyList_add(plist, new_p);
4095 }
4096 
4097 void Arguments::PropertyList_add(SystemProperty *element) {
4098   PropertyList_add(&_system_properties, element);
4099 }
4100 
4101 // This add maintains unique property key in the list.
4102 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4103   if (plist == NULL)
4104     return;
4105 
4106   // If property key exist then update with new value.
4107   SystemProperty* prop;
4108   for (prop = *plist; prop != NULL; prop = prop->next()) {
4109     if (strcmp(k, prop->key()) == 0) {
4110       if (append) {
4111         prop->append_value(v);
4112       } else {
4113         prop->set_value(v);
4114       }
4115       return;
4116     }
4117   }
4118 
4119   PropertyList_add(plist, k, v);
4120 }
4121 
4122 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4123 // Returns true if all of the source pointed by src has been copied over to
4124 // the destination buffer pointed by buf. Otherwise, returns false.
4125 // Notes:
4126 // 1. If the length (buflen) of the destination buffer excluding the
4127 // NULL terminator character is not long enough for holding the expanded
4128 // pid characters, it also returns false instead of returning the partially
4129 // expanded one.
4130 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4131 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4132                                 char* buf, size_t buflen) {
4133   const char* p = src;
4134   char* b = buf;
4135   const char* src_end = &src[srclen];
4136   char* buf_end = &buf[buflen - 1];
4137 
4138   while (p < src_end && b < buf_end) {
4139     if (*p == '%') {
4140       switch (*(++p)) {
4141       case '%':         // "%%" ==> "%"
4142         *b++ = *p++;
4143         break;
4144       case 'p':  {       //  "%p" ==> current process id
4145         // buf_end points to the character before the last character so
4146         // that we could write '\0' to the end of the buffer.
4147         size_t buf_sz = buf_end - b + 1;
4148         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4149 
4150         // if jio_snprintf fails or the buffer is not long enough to hold
4151         // the expanded pid, returns false.
4152         if (ret < 0 || ret >= (int)buf_sz) {
4153           return false;
4154         } else {
4155           b += ret;
4156           assert(*b == '\0', "fail in copy_expand_pid");
4157           if (p == src_end && b == buf_end + 1) {
4158             // reach the end of the buffer.
4159             return true;
4160           }
4161         }
4162         p++;
4163         break;
4164       }
4165       default :
4166         *b++ = '%';
4167       }
4168     } else {
4169       *b++ = *p++;
4170     }
4171   }
4172   *b = '\0';
4173   return (p == src_end); // return false if not all of the source was copied
4174 }