1 /*
   2  * Copyright (c) 1997, 2019, 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/symbolTable.hpp"
  29 #include "compiler/compilerOracle.hpp"
  30 #include "memory/allocation.inline.hpp"
  31 #include "memory/cardTableRS.hpp"
  32 #include "memory/genCollectedHeap.hpp"
  33 #include "memory/referenceProcessor.hpp"
  34 #include "memory/universe.inline.hpp"
  35 #include "oops/oop.inline.hpp"
  36 #include "prims/jvmtiExport.hpp"
  37 #include "runtime/arguments.hpp"
  38 #include "runtime/arguments_ext.hpp"
  39 #include "runtime/globals_extension.hpp"
  40 #include "runtime/java.hpp"
  41 #include "services/management.hpp"
  42 #include "services/memTracker.hpp"
  43 #include "utilities/defaultStream.hpp"
  44 #include "utilities/macros.hpp"
  45 #include "utilities/stringUtils.hpp"
  46 #include "utilities/taskqueue.hpp"
  47 #if INCLUDE_JFR
  48 #include "jfr/jfr.hpp"
  49 #endif
  50 #ifdef TARGET_OS_FAMILY_linux
  51 # include "os_linux.inline.hpp"
  52 #endif
  53 #ifdef TARGET_OS_FAMILY_solaris
  54 # include "os_solaris.inline.hpp"
  55 #endif
  56 #ifdef TARGET_OS_FAMILY_windows
  57 # include "os_windows.inline.hpp"
  58 #endif
  59 #ifdef TARGET_OS_FAMILY_aix
  60 # include "os_aix.inline.hpp"
  61 #endif
  62 #ifdef TARGET_OS_FAMILY_bsd
  63 # include "os_bsd.inline.hpp"
  64 #endif
  65 #if INCLUDE_ALL_GCS
  66 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  67 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  68 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  69 #endif // INCLUDE_ALL_GCS
  70 
  71 // Note: This is a special bug reporting site for the JVM
  72 #ifdef VENDOR_URL_VM_BUG
  73 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
  74 #else
  75 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  76 #endif
  77 #define DEFAULT_JAVA_LAUNCHER  "generic"
  78 
  79 // Disable options not supported in this release, with a warning if they
  80 // were explicitly requested on the command-line
  81 #define UNSUPPORTED_OPTION(opt, description)                    \
  82 do {                                                            \
  83   if (opt) {                                                    \
  84     if (FLAG_IS_CMDLINE(opt)) {                                 \
  85       warning(description " is disabled in this release.");     \
  86     }                                                           \
  87     FLAG_SET_DEFAULT(opt, false);                               \
  88   }                                                             \
  89 } while(0)
  90 
  91 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  92 do {                                                                  \
  93   if (gc) {                                                           \
  94     if (FLAG_IS_CMDLINE(gc)) {                                        \
  95       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  96     }                                                                 \
  97     FLAG_SET_DEFAULT(gc, false);                                      \
  98   }                                                                   \
  99 } while(0)
 100 
 101 char**  Arguments::_jvm_flags_array             = NULL;
 102 int     Arguments::_num_jvm_flags               = 0;
 103 char**  Arguments::_jvm_args_array              = NULL;
 104 int     Arguments::_num_jvm_args                = 0;
 105 char*  Arguments::_java_command                 = NULL;
 106 SystemProperty* Arguments::_system_properties   = NULL;
 107 const char*  Arguments::_gc_log_filename        = NULL;
 108 bool   Arguments::_has_profile                  = false;
 109 size_t Arguments::_conservative_max_heap_alignment = 0;
 110 uintx  Arguments::_min_heap_size                = 0;
 111 uintx  Arguments::_min_heap_free_ratio          = 0;
 112 uintx  Arguments::_max_heap_free_ratio          = 0;
 113 Arguments::Mode Arguments::_mode                = _mixed;
 114 bool   Arguments::_java_compiler                = false;
 115 bool   Arguments::_xdebug_mode                  = false;
 116 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
 117 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
 118 int    Arguments::_sun_java_launcher_pid        = -1;
 119 bool   Arguments::_created_by_gamma_launcher    = false;
 120 
 121 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
 122 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 123 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 124 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 125 bool   Arguments::_ClipInlining                 = ClipInlining;
 126 
 127 char*  Arguments::SharedArchivePath             = NULL;
 128 
 129 AgentLibraryList Arguments::_libraryList;
 130 AgentLibraryList Arguments::_agentList;
 131 
 132 abort_hook_t     Arguments::_abort_hook         = NULL;
 133 exit_hook_t      Arguments::_exit_hook          = NULL;
 134 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 135 
 136 
 137 SystemProperty *Arguments::_java_ext_dirs = NULL;
 138 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
 139 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 140 SystemProperty *Arguments::_java_library_path = NULL;
 141 SystemProperty *Arguments::_java_home = NULL;
 142 SystemProperty *Arguments::_java_class_path = NULL;
 143 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 144 
 145 char* Arguments::_meta_index_path = NULL;
 146 char* Arguments::_meta_index_dir = NULL;
 147 
 148 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
 149 
 150 static bool match_option(const JavaVMOption *option, const char* name,
 151                          const char** tail) {
 152   int len = (int)strlen(name);
 153   if (strncmp(option->optionString, name, len) == 0) {
 154     *tail = option->optionString + len;
 155     return true;
 156   } else {
 157     return false;
 158   }
 159 }
 160 
 161 #if INCLUDE_JFR
 162 // return true on failure
 163 static bool match_jfr_option(const JavaVMOption** option) {
 164   assert((*option)->optionString != NULL, "invariant");
 165   char* tail = NULL;
 166   if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
 167     return Jfr::on_start_flight_recording_option(option, tail);
 168   } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
 169     return Jfr::on_flight_recorder_option(option, tail);
 170   }
 171   return false;
 172 }
 173 #endif
 174 
 175 static void logOption(const char* opt) {
 176   if (PrintVMOptions) {
 177     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 178   }
 179 }
 180 
 181 // Process java launcher properties.
 182 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 183   // See if sun.java.launcher or sun.java.launcher.pid is defined.
 184   // Must do this before setting up other system properties,
 185   // as some of them may depend on launcher type.
 186   for (int index = 0; index < args->nOptions; index++) {
 187     const JavaVMOption* option = args->options + index;
 188     const char* tail;
 189 
 190     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 191       process_java_launcher_argument(tail, option->extraInfo);
 192       continue;
 193     }
 194     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 195       _sun_java_launcher_pid = atoi(tail);
 196       continue;
 197     }
 198   }
 199 }
 200 
 201 // Initialize system properties key and value.
 202 void Arguments::init_system_properties() {
 203 
 204   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 205                                                                  "Java Virtual Machine Specification",  false));
 206   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 207   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 208   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 209 
 210   // following are JVMTI agent writeable properties.
 211   // Properties values are set to NULL and they are
 212   // os specific they are initialized in os::init_system_properties_values().
 213   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 214   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 215   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 216   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 217   _java_home =  new SystemProperty("java.home", NULL,  true);
 218   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 219 
 220   _java_class_path = new SystemProperty("java.class.path", "",  true);
 221 
 222   // Add to System Property list.
 223   PropertyList_add(&_system_properties, _java_ext_dirs);
 224   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 225   PropertyList_add(&_system_properties, _sun_boot_library_path);
 226   PropertyList_add(&_system_properties, _java_library_path);
 227   PropertyList_add(&_system_properties, _java_home);
 228   PropertyList_add(&_system_properties, _java_class_path);
 229   PropertyList_add(&_system_properties, _sun_boot_class_path);
 230 
 231   // Set OS specific system properties values
 232   os::init_system_properties_values();
 233 }
 234 
 235 
 236   // Update/Initialize System properties after JDK version number is known
 237 void Arguments::init_version_specific_system_properties() {
 238   enum { bufsz = 16 };
 239   char buffer[bufsz];
 240   const char* spec_vendor = "Sun Microsystems Inc.";
 241   uint32_t spec_version = 0;
 242 
 243   if (JDK_Version::is_gte_jdk17x_version()) {
 244     spec_vendor = "Oracle Corporation";
 245     spec_version = JDK_Version::current().major_version();
 246   }
 247   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 248 
 249   PropertyList_add(&_system_properties,
 250       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 251   PropertyList_add(&_system_properties,
 252       new SystemProperty("java.vm.specification.version", buffer, false));
 253   PropertyList_add(&_system_properties,
 254       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 255 }
 256 
 257 /**
 258  * Provide a slightly more user-friendly way of eliminating -XX flags.
 259  * When a flag is eliminated, it can be added to this list in order to
 260  * continue accepting this flag on the command-line, while issuing a warning
 261  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 262  * limit, we flatly refuse to admit the existence of the flag.  This allows
 263  * a flag to die correctly over JDK releases using HSX.
 264  */
 265 typedef struct {
 266   const char* name;
 267   JDK_Version obsoleted_in; // when the flag went away
 268   JDK_Version accept_until; // which version to start denying the existence
 269 } ObsoleteFlag;
 270 
 271 static ObsoleteFlag obsolete_jvm_flags[] = {
 272   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 273   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 274   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 275   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 276   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 277   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 278   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 279   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 280   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 281   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 282   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 283   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 284   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 285   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 286   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 287   { "DefaultInitialRAMFraction",
 288                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 289   { "UseDepthFirstScavengeOrder",
 290                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 291   { "HandlePromotionFailure",
 292                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 293   { "MaxLiveObjectEvacuationRatio",
 294                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 295   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 296   { "UseParallelOldGCCompacting",
 297                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 298   { "UseParallelDensePrefixUpdate",
 299                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 300   { "UseParallelOldGCDensePrefix",
 301                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 302   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 303   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 304   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 305   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 306   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 307   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 308   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 309   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 310   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 311   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 312   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 313   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 314   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 315   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 316   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 317   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 318   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 319   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 320   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 321   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 322   { "UseOldInlining",                JDK_Version::jdk_update(8, 20), JDK_Version::jdk(10) },
 323   { "AutoShutdownNMT",               JDK_Version::jdk_update(8, 40), JDK_Version::jdk(10) },
 324   { "CompilationRepeat",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 325   { "SegmentedHeapDumpThreshold",    JDK_Version::jdk_update(8, 252), JDK_Version::jdk(10) },
 326 #ifdef PRODUCT
 327   { "DesiredMethodLimit",
 328                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 329 #endif // PRODUCT
 330   { NULL, JDK_Version(0), JDK_Version(0) }
 331 };
 332 
 333 // Returns true if the flag is obsolete and fits into the range specified
 334 // for being ignored.  In the case that the flag is ignored, the 'version'
 335 // value is filled in with the version number when the flag became
 336 // obsolete so that that value can be displayed to the user.
 337 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 338   int i = 0;
 339   assert(version != NULL, "Must provide a version buffer");
 340   while (obsolete_jvm_flags[i].name != NULL) {
 341     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 342     // <flag>=xxx form
 343     // [-|+]<flag> form
 344     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 345         ((s[0] == '+' || s[0] == '-') &&
 346         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 347       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 348           *version = flag_status.obsoleted_in;
 349           return true;
 350       }
 351     }
 352     i++;
 353   }
 354   return false;
 355 }
 356 
 357 // Constructs the system class path (aka boot class path) from the following
 358 // components, in order:
 359 //
 360 //     prefix           // from -Xbootclasspath/p:...
 361 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 362 //     base             // from os::get_system_properties() or -Xbootclasspath=
 363 //     suffix           // from -Xbootclasspath/a:...
 364 //
 365 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 366 // directories are added to the sysclasspath just before the base.
 367 //
 368 // This could be AllStatic, but it isn't needed after argument processing is
 369 // complete.
 370 class SysClassPath: public StackObj {
 371 public:
 372   SysClassPath(const char* base);
 373   ~SysClassPath();
 374 
 375   inline void set_base(const char* base);
 376   inline void add_prefix(const char* prefix);
 377   inline void add_suffix_to_prefix(const char* suffix);
 378   inline void add_suffix(const char* suffix);
 379   inline void reset_path(const char* base);
 380 
 381   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 382   // property.  Must be called after all command-line arguments have been
 383   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 384   // combined_path().
 385   void expand_endorsed();
 386 
 387   inline const char* get_base()     const { return _items[_scp_base]; }
 388   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 389   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 390   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 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_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 408     _scp_base,          // the default sysclasspath
 409     _scp_suffix,        // from -Xbootclasspath/a:...
 410     _scp_nitems         // the number of items, must be last.
 411   };
 412 
 413   const char* _items[_scp_nitems];
 414   DEBUG_ONLY(bool _expansion_done;)
 415 };
 416 
 417 SysClassPath::SysClassPath(const char* base) {
 418   memset(_items, 0, sizeof(_items));
 419   _items[_scp_base] = base;
 420   DEBUG_ONLY(_expansion_done = false;)
 421 }
 422 
 423 SysClassPath::~SysClassPath() {
 424   // Free everything except the base.
 425   for (int i = 0; i < _scp_nitems; ++i) {
 426     if (i != _scp_base) reset_item_at(i);
 427   }
 428   DEBUG_ONLY(_expansion_done = false;)
 429 }
 430 
 431 inline void SysClassPath::set_base(const char* base) {
 432   _items[_scp_base] = base;
 433 }
 434 
 435 inline void SysClassPath::add_prefix(const char* prefix) {
 436   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 437 }
 438 
 439 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 440   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 441 }
 442 
 443 inline void SysClassPath::add_suffix(const char* suffix) {
 444   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 445 }
 446 
 447 inline void SysClassPath::reset_item_at(int index) {
 448   assert(index < _scp_nitems && index != _scp_base, "just checking");
 449   if (_items[index] != NULL) {
 450     FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
 451     _items[index] = NULL;
 452   }
 453 }
 454 
 455 inline void SysClassPath::reset_path(const char* base) {
 456   // Clear the prefix and suffix.
 457   reset_item_at(_scp_prefix);
 458   reset_item_at(_scp_suffix);
 459   set_base(base);
 460 }
 461 
 462 //------------------------------------------------------------------------------
 463 
 464 void SysClassPath::expand_endorsed() {
 465   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 466 
 467   const char* path = Arguments::get_property("java.endorsed.dirs");
 468   if (path == NULL) {
 469     path = Arguments::get_endorsed_dir();
 470     assert(path != NULL, "no default for java.endorsed.dirs");
 471   }
 472 
 473   char* expanded_path = NULL;
 474   const char separator = *os::path_separator();
 475   const char* const end = path + strlen(path);
 476   while (path < end) {
 477     const char* tmp_end = strchr(path, separator);
 478     if (tmp_end == NULL) {
 479       expanded_path = add_jars_to_path(expanded_path, path);
 480       path = end;
 481     } else {
 482       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
 483       memcpy(dirpath, path, tmp_end - path);
 484       dirpath[tmp_end - path] = '\0';
 485       expanded_path = add_jars_to_path(expanded_path, dirpath);
 486       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
 487       path = tmp_end + 1;
 488     }
 489   }
 490   _items[_scp_endorsed] = expanded_path;
 491   DEBUG_ONLY(_expansion_done = true;)
 492 }
 493 
 494 // Combine the bootclasspath elements, some of which may be null, into a single
 495 // c-heap-allocated string.
 496 char* SysClassPath::combined_path() {
 497   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 498   assert(_expansion_done, "must call expand_endorsed() first.");
 499 
 500   size_t lengths[_scp_nitems];
 501   size_t total_len = 0;
 502 
 503   const char separator = *os::path_separator();
 504 
 505   // Get the lengths.
 506   int i;
 507   for (i = 0; i < _scp_nitems; ++i) {
 508     if (_items[i] != NULL) {
 509       lengths[i] = strlen(_items[i]);
 510       // Include space for the separator char (or a NULL for the last item).
 511       total_len += lengths[i] + 1;
 512     }
 513   }
 514   assert(total_len > 0, "empty sysclasspath not allowed");
 515 
 516   // Copy the _items to a single string.
 517   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 518   char* cp_tmp = cp;
 519   for (i = 0; i < _scp_nitems; ++i) {
 520     if (_items[i] != NULL) {
 521       memcpy(cp_tmp, _items[i], lengths[i]);
 522       cp_tmp += lengths[i];
 523       *cp_tmp++ = separator;
 524     }
 525   }
 526   *--cp_tmp = '\0';     // Replace the extra separator.
 527   return cp;
 528 }
 529 
 530 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 531 char*
 532 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 533   char *cp;
 534 
 535   assert(str != NULL, "just checking");
 536   if (path == NULL) {
 537     size_t len = strlen(str) + 1;
 538     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 539     memcpy(cp, str, len);                       // copy the trailing null
 540   } else {
 541     const char separator = *os::path_separator();
 542     size_t old_len = strlen(path);
 543     size_t str_len = strlen(str);
 544     size_t len = old_len + str_len + 2;
 545 
 546     if (prepend) {
 547       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 548       char* cp_tmp = cp;
 549       memcpy(cp_tmp, str, str_len);
 550       cp_tmp += str_len;
 551       *cp_tmp = separator;
 552       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 553       FREE_C_HEAP_ARRAY(char, path, mtInternal);
 554     } else {
 555       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 556       char* cp_tmp = cp + old_len;
 557       *cp_tmp = separator;
 558       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 559     }
 560   }
 561   return cp;
 562 }
 563 
 564 // Scan the directory and append any jar or zip files found to path.
 565 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 566 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 567   DIR* dir = os::opendir(directory);
 568   if (dir == NULL) return path;
 569 
 570   char dir_sep[2] = { '\0', '\0' };
 571   size_t directory_len = strlen(directory);
 572   const char fileSep = *os::file_separator();
 573   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 574 
 575   /* Scan the directory for jars/zips, appending them to path. */
 576   struct dirent *entry;
 577   while ((entry = os::readdir(dir)) != NULL) {
 578     const char* name = entry->d_name;
 579     const char* ext = name + strlen(name) - 4;
 580     bool isJarOrZip = ext > name &&
 581       (os::file_name_strcmp(ext, ".jar") == 0 ||
 582        os::file_name_strcmp(ext, ".zip") == 0);
 583     if (isJarOrZip) {
 584       size_t length = directory_len + 2 + strlen(name);
 585       char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
 586       jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
 587       path = add_to_path(path, jarpath, false);
 588       FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
 589     }
 590   }
 591   os::closedir(dir);
 592   return path;
 593 }
 594 
 595 // Parses a memory size specification string.
 596 static bool atomull(const char *s, julong* result) {
 597   julong n = 0;
 598   int args_read = sscanf(s, JULONG_FORMAT, &n);
 599   if (args_read != 1) {
 600     return false;
 601   }
 602   while (*s != '\0' && isdigit(*s)) {
 603     s++;
 604   }
 605   // 4705540: illegal if more characters are found after the first non-digit
 606   if (strlen(s) > 1) {
 607     return false;
 608   }
 609   switch (*s) {
 610     case 'T': case 't':
 611       *result = n * G * K;
 612       // Check for overflow.
 613       if (*result/((julong)G * K) != n) return false;
 614       return true;
 615     case 'G': case 'g':
 616       *result = n * G;
 617       if (*result/G != n) return false;
 618       return true;
 619     case 'M': case 'm':
 620       *result = n * M;
 621       if (*result/M != n) return false;
 622       return true;
 623     case 'K': case 'k':
 624       *result = n * K;
 625       if (*result/K != n) return false;
 626       return true;
 627     case '\0':
 628       *result = n;
 629       return true;
 630     default:
 631       return false;
 632   }
 633 }
 634 
 635 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 636   if (size < min_size) return arg_too_small;
 637   // Check that size will fit in a size_t (only relevant on 32-bit)
 638   if (size > max_uintx) return arg_too_big;
 639   return arg_in_range;
 640 }
 641 
 642 // Describe an argument out of range error
 643 void Arguments::describe_range_error(ArgsRange errcode) {
 644   switch(errcode) {
 645   case arg_too_big:
 646     jio_fprintf(defaultStream::error_stream(),
 647                 "The specified size exceeds the maximum "
 648                 "representable size.\n");
 649     break;
 650   case arg_too_small:
 651   case arg_unreadable:
 652   case arg_in_range:
 653     // do nothing for now
 654     break;
 655   default:
 656     ShouldNotReachHere();
 657   }
 658 }
 659 
 660 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 661   return CommandLineFlags::boolAtPut(name, &value, origin);
 662 }
 663 
 664 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 665   double v;
 666   if (sscanf(value, "%lf", &v) != 1) {
 667     return false;
 668   }
 669 
 670   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 671     return true;
 672   }
 673   return false;
 674 }
 675 
 676 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 677   julong v;
 678   intx intx_v;
 679   bool is_neg = false;
 680   // Check the sign first since atomull() parses only unsigned values.
 681   if (*value == '-') {
 682     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 683       return false;
 684     }
 685     value++;
 686     is_neg = true;
 687   }
 688   if (!atomull(value, &v)) {
 689     return false;
 690   }
 691   intx_v = (intx) v;
 692   if (is_neg) {
 693     intx_v = -intx_v;
 694   }
 695   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 696     return true;
 697   }
 698   uintx uintx_v = (uintx) v;
 699   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 700     return true;
 701   }
 702   uint64_t uint64_t_v = (uint64_t) v;
 703   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 704     return true;
 705   }
 706   return false;
 707 }
 708 
 709 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 710   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 711   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 712   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 713   return true;
 714 }
 715 
 716 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 717   const char* old_value = "";
 718   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 719   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 720   size_t new_len = strlen(new_value);
 721   const char* value;
 722   char* free_this_too = NULL;
 723   if (old_len == 0) {
 724     value = new_value;
 725   } else if (new_len == 0) {
 726     value = old_value;
 727   } else {
 728     size_t length = old_len + 1 + new_len + 1;
 729     char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
 730     // each new setting adds another LINE to the switch:
 731     jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
 732     value = buf;
 733     free_this_too = buf;
 734   }
 735   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 736   // CommandLineFlags always returns a pointer that needs freeing.
 737   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 738   if (free_this_too != NULL) {
 739     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 740     FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
 741   }
 742   return true;
 743 }
 744 
 745 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 746 
 747   // range of acceptable characters spelled out for portability reasons
 748 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 749 #define BUFLEN 255
 750   char name[BUFLEN+1];
 751   char dummy;
 752 
 753   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 754     return set_bool_flag(name, false, origin);
 755   }
 756   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 757     return set_bool_flag(name, true, origin);
 758   }
 759 
 760   char punct;
 761   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 762     const char* value = strchr(arg, '=') + 1;
 763     Flag* flag = Flag::find_flag(name, strlen(name));
 764     if (flag != NULL && flag->is_ccstr()) {
 765       if (flag->ccstr_accumulates()) {
 766         return append_to_string_flag(name, value, origin);
 767       } else {
 768         if (value[0] == '\0') {
 769           value = NULL;
 770         }
 771         return set_string_flag(name, value, origin);
 772       }
 773     }
 774   }
 775 
 776   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 777     const char* value = strchr(arg, '=') + 1;
 778     // -XX:Foo:=xxx will reset the string flag to the given value.
 779     if (value[0] == '\0') {
 780       value = NULL;
 781     }
 782     return set_string_flag(name, value, origin);
 783   }
 784 
 785 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 786 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 787 #define        NUMBER_RANGE    "[0123456789]"
 788   char value[BUFLEN + 1];
 789   char value2[BUFLEN + 1];
 790   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 791     // Looks like a floating-point number -- try again with more lenient format string
 792     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 793       return set_fp_numeric_flag(name, value, origin);
 794     }
 795   }
 796 
 797 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 798   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 799     return set_numeric_flag(name, value, origin);
 800   }
 801 
 802   return false;
 803 }
 804 
 805 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 806   assert(bldarray != NULL, "illegal argument");
 807 
 808   if (arg == NULL) {
 809     return;
 810   }
 811 
 812   int new_count = *count + 1;
 813 
 814   // expand the array and add arg to the last element
 815   if (*bldarray == NULL) {
 816     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 817   } else {
 818     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 819   }
 820   (*bldarray)[*count] = strdup(arg);
 821   *count = new_count;
 822 }
 823 
 824 void Arguments::build_jvm_args(const char* arg) {
 825   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 826 }
 827 
 828 void Arguments::build_jvm_flags(const char* arg) {
 829   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 830 }
 831 
 832 // utility function to return a string that concatenates all
 833 // strings in a given char** array
 834 const char* Arguments::build_resource_string(char** args, int count) {
 835   if (args == NULL || count == 0) {
 836     return NULL;
 837   }
 838   size_t length = 0;
 839   for (int i = 0; i < count; i++) {
 840     length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
 841   }
 842   char* s = NEW_RESOURCE_ARRAY(char, length);
 843   char* dst = s;
 844   for (int j = 0; j < count; j++) {
 845     size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
 846     jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
 847     dst += offset;
 848     length -= offset;
 849   }
 850   return (const char*) s;
 851 }
 852 
 853 void Arguments::print_on(outputStream* st) {
 854   st->print_cr("VM Arguments:");
 855   if (num_jvm_flags() > 0) {
 856     st->print("jvm_flags: "); print_jvm_flags_on(st);
 857   }
 858   if (num_jvm_args() > 0) {
 859     st->print("jvm_args: "); print_jvm_args_on(st);
 860   }
 861   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 862   if (_java_class_path != NULL) {
 863     char* path = _java_class_path->value();
 864     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 865   }
 866   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 867 }
 868 
 869 void Arguments::print_jvm_flags_on(outputStream* st) {
 870   if (_num_jvm_flags > 0) {
 871     for (int i=0; i < _num_jvm_flags; i++) {
 872       st->print("%s ", _jvm_flags_array[i]);
 873     }
 874     st->cr();
 875   }
 876 }
 877 
 878 void Arguments::print_jvm_args_on(outputStream* st) {
 879   if (_num_jvm_args > 0) {
 880     for (int i=0; i < _num_jvm_args; i++) {
 881       st->print("%s ", _jvm_args_array[i]);
 882     }
 883     st->cr();
 884   }
 885 }
 886 
 887 bool Arguments::process_argument(const char* arg,
 888     jboolean ignore_unrecognized, Flag::Flags origin) {
 889 
 890   JDK_Version since = JDK_Version();
 891 
 892   if (parse_argument(arg, origin) || ignore_unrecognized) {
 893     return true;
 894   }
 895 
 896   bool has_plus_minus = (*arg == '+' || *arg == '-');
 897   const char* const argname = has_plus_minus ? arg + 1 : arg;
 898   if (is_newly_obsolete(arg, &since)) {
 899     char version[256];
 900     since.to_string(version, sizeof(version));
 901     warning("ignoring option %s; support was removed in %s", argname, version);
 902     return true;
 903   }
 904 
 905   // For locked flags, report a custom error message if available.
 906   // Otherwise, report the standard unrecognized VM option.
 907 
 908   size_t arg_len;
 909   const char* equal_sign = strchr(argname, '=');
 910   if (equal_sign == NULL) {
 911     arg_len = strlen(argname);
 912   } else {
 913     arg_len = equal_sign - argname;
 914   }
 915 
 916   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 917   if (found_flag != NULL) {
 918     char locked_message_buf[BUFLEN];
 919     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 920     if (strlen(locked_message_buf) == 0) {
 921       if (found_flag->is_bool() && !has_plus_minus) {
 922         jio_fprintf(defaultStream::error_stream(),
 923           "Missing +/- setting for VM option '%s'\n", argname);
 924       } else if (!found_flag->is_bool() && has_plus_minus) {
 925         jio_fprintf(defaultStream::error_stream(),
 926           "Unexpected +/- setting in VM option '%s'\n", argname);
 927       } else {
 928         jio_fprintf(defaultStream::error_stream(),
 929           "Improperly specified VM option '%s'\n", argname);
 930       }
 931     } else {
 932       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 933     }
 934   } else {
 935     jio_fprintf(defaultStream::error_stream(),
 936                 "Unrecognized VM option '%s'\n", argname);
 937     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 938     if (fuzzy_matched != NULL) {
 939       jio_fprintf(defaultStream::error_stream(),
 940                   "Did you mean '%s%s%s'?\n",
 941                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 942                   fuzzy_matched->_name,
 943                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 944     }
 945   }
 946 
 947   // allow for commandline "commenting out" options like -XX:#+Verbose
 948   return arg[0] == '#';
 949 }
 950 
 951 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 952   FILE* stream = fopen(file_name, "rb");
 953   if (stream == NULL) {
 954     if (should_exist) {
 955       jio_fprintf(defaultStream::error_stream(),
 956                   "Could not open settings file %s\n", file_name);
 957       return false;
 958     } else {
 959       return true;
 960     }
 961   }
 962 
 963   char token[1024];
 964   int  pos = 0;
 965 
 966   bool in_white_space = true;
 967   bool in_comment     = false;
 968   bool in_quote       = false;
 969   char quote_c        = 0;
 970   bool result         = true;
 971 
 972   int c = getc(stream);
 973   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 974     if (in_white_space) {
 975       if (in_comment) {
 976         if (c == '\n') in_comment = false;
 977       } else {
 978         if (c == '#') in_comment = true;
 979         else if (!isspace(c)) {
 980           in_white_space = false;
 981           token[pos++] = c;
 982         }
 983       }
 984     } else {
 985       if (c == '\n' || (!in_quote && isspace(c))) {
 986         // token ends at newline, or at unquoted whitespace
 987         // this allows a way to include spaces in string-valued options
 988         token[pos] = '\0';
 989         logOption(token);
 990         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 991         build_jvm_flags(token);
 992         pos = 0;
 993         in_white_space = true;
 994         in_quote = false;
 995       } else if (!in_quote && (c == '\'' || c == '"')) {
 996         in_quote = true;
 997         quote_c = c;
 998       } else if (in_quote && (c == quote_c)) {
 999         in_quote = false;
1000       } else {
1001         token[pos++] = c;
1002       }
1003     }
1004     c = getc(stream);
1005   }
1006   if (pos > 0) {
1007     token[pos] = '\0';
1008     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1009     build_jvm_flags(token);
1010   }
1011   fclose(stream);
1012   return result;
1013 }
1014 
1015 //=============================================================================================================
1016 // Parsing of properties (-D)
1017 
1018 const char* Arguments::get_property(const char* key) {
1019   return PropertyList_get_value(system_properties(), key);
1020 }
1021 
1022 bool Arguments::add_property(const char* prop) {
1023   const char* eq = strchr(prop, '=');
1024   char* key;
1025   // ns must be static--its address may be stored in a SystemProperty object.
1026   const static char ns[1] = {0};
1027   char* value = (char *)ns;
1028 
1029   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1030   key = AllocateHeap(key_len + 1, mtInternal);
1031   strncpy(key, prop, key_len);
1032   key[key_len] = '\0';
1033 
1034   if (eq != NULL) {
1035     size_t value_len = strlen(prop) - key_len - 1;
1036     value = AllocateHeap(value_len + 1, mtInternal);
1037     strncpy(value, &prop[key_len + 1], value_len + 1);
1038   }
1039 
1040   if (strcmp(key, "java.compiler") == 0) {
1041     process_java_compiler_argument(value);
1042     FreeHeap(key);
1043     if (eq != NULL) {
1044       FreeHeap(value);
1045     }
1046     return true;
1047   } else if (strcmp(key, "sun.java.command") == 0) {
1048     _java_command = value;
1049 
1050     // Record value in Arguments, but let it get passed to Java.
1051   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1052     // launcher.pid property is private and is processed
1053     // in process_sun_java_launcher_properties();
1054     // the sun.java.launcher property is passed on to the java application
1055     FreeHeap(key);
1056     if (eq != NULL) {
1057       FreeHeap(value);
1058     }
1059     return true;
1060   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1061     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1062     // its value without going through the property list or making a Java call.
1063     _java_vendor_url_bug = value;
1064   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1065     PropertyList_unique_add(&_system_properties, key, value, true);
1066     return true;
1067   }
1068   // Create new property and add at the end of the list
1069   PropertyList_unique_add(&_system_properties, key, value);
1070   return true;
1071 }
1072 
1073 //===========================================================================================================
1074 // Setting int/mixed/comp mode flags
1075 
1076 void Arguments::set_mode_flags(Mode mode) {
1077   // Set up default values for all flags.
1078   // If you add a flag to any of the branches below,
1079   // add a default value for it here.
1080   set_java_compiler(false);
1081   _mode                      = mode;
1082 
1083   // Ensure Agent_OnLoad has the correct initial values.
1084   // This may not be the final mode; mode may change later in onload phase.
1085   PropertyList_unique_add(&_system_properties, "java.vm.info",
1086                           (char*)VM_Version::vm_info_string(), false);
1087 
1088   UseInterpreter             = true;
1089   UseCompiler                = true;
1090   UseLoopCounter             = true;
1091 
1092 #ifndef ZERO
1093   // Turn these off for mixed and comp.  Leave them on for Zero.
1094   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1095     UseFastAccessorMethods = (mode == _int);
1096   }
1097   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1098     UseFastEmptyMethods = (mode == _int);
1099   }
1100 #endif
1101 
1102   // Default values may be platform/compiler dependent -
1103   // use the saved values
1104   ClipInlining               = Arguments::_ClipInlining;
1105   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1106   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1107   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1108 
1109   // Change from defaults based on mode
1110   switch (mode) {
1111   default:
1112     ShouldNotReachHere();
1113     break;
1114   case _int:
1115     UseCompiler              = false;
1116     UseLoopCounter           = false;
1117     AlwaysCompileLoopMethods = false;
1118     UseOnStackReplacement    = false;
1119     break;
1120   case _mixed:
1121     // same as default
1122     break;
1123   case _comp:
1124     UseInterpreter           = false;
1125     BackgroundCompilation    = false;
1126     ClipInlining             = false;
1127     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1128     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1129     // compile a level 4 (C2) and then continue executing it.
1130     if (TieredCompilation) {
1131       Tier3InvokeNotifyFreqLog = 0;
1132       Tier4InvocationThreshold = 0;
1133     }
1134     break;
1135   }
1136 }
1137 
1138 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1139 // Conflict: required to use shared spaces (-Xshare:on), but
1140 // incompatible command line options were chosen.
1141 
1142 static void no_shared_spaces(const char* message) {
1143   if (RequireSharedSpaces) {
1144     jio_fprintf(defaultStream::error_stream(),
1145       "Class data sharing is inconsistent with other specified options.\n");
1146     vm_exit_during_initialization("Unable to use shared archive.", message);
1147   } else {
1148     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1149   }
1150 }
1151 #endif
1152 
1153 void Arguments::set_tiered_flags() {
1154   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1155   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1156     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1157   }
1158   if (CompilationPolicyChoice < 2) {
1159     vm_exit_during_initialization(
1160       "Incompatible compilation policy selected", NULL);
1161   }
1162   // Increase the code cache size - tiered compiles a lot more.
1163   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1164     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1165   }
1166   if (!UseInterpreter) { // -Xcomp
1167     Tier3InvokeNotifyFreqLog = 0;
1168     Tier4InvocationThreshold = 0;
1169   }
1170 }
1171 
1172 /**
1173  * Returns the minimum number of compiler threads needed to run the JVM. The following
1174  * configurations are possible.
1175  *
1176  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1177  *    compiler threads is 0.
1178  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1179  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1180  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1181  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1182  *    C1 can be used, so the minimum number of compiler threads is 1.
1183  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1184  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1185  *    the minimum number of compiler threads is 2.
1186  */
1187 int Arguments::get_min_number_of_compiler_threads() {
1188 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1189   return 0;   // case 1
1190 #else
1191   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1192     return 1; // case 2 or case 3
1193   }
1194   return 2;   // case 4 (tiered)
1195 #endif
1196 }
1197 
1198 #if INCLUDE_ALL_GCS
1199 static void disable_adaptive_size_policy(const char* collector_name) {
1200   if (UseAdaptiveSizePolicy) {
1201     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1202       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1203               collector_name);
1204     }
1205     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1206   }
1207 }
1208 
1209 void Arguments::set_parnew_gc_flags() {
1210   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1211          "control point invariant");
1212   assert(UseParNewGC, "Error");
1213 
1214   // Turn off AdaptiveSizePolicy for parnew until it is complete.
1215   disable_adaptive_size_policy("UseParNewGC");
1216 
1217   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1218     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1219     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1220   } else if (ParallelGCThreads == 0) {
1221     jio_fprintf(defaultStream::error_stream(),
1222         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1223     vm_exit(1);
1224   }
1225 
1226   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1227   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1228   // we set them to 1024 and 1024.
1229   // See CR 6362902.
1230   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1231     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1232   }
1233   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1234     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1235   }
1236 
1237   // AlwaysTenure flag should make ParNew promote all at first collection.
1238   // See CR 6362902.
1239   if (AlwaysTenure) {
1240     FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1241   }
1242   // When using compressed oops, we use local overflow stacks,
1243   // rather than using a global overflow list chained through
1244   // the klass word of the object's pre-image.
1245   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1246     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1247       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1248     }
1249     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1250   }
1251   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1252 }
1253 
1254 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1255 // sparc/solaris for certain applications, but would gain from
1256 // further optimization and tuning efforts, and would almost
1257 // certainly gain from analysis of platform and environment.
1258 void Arguments::set_cms_and_parnew_gc_flags() {
1259   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1260   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1261 
1262   // If we are using CMS, we prefer to UseParNewGC,
1263   // unless explicitly forbidden.
1264   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1265     FLAG_SET_ERGO(bool, UseParNewGC, true);
1266   }
1267 
1268   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1269   disable_adaptive_size_policy("UseConcMarkSweepGC");
1270 
1271   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1272   // as needed.
1273   if (UseParNewGC) {
1274     set_parnew_gc_flags();
1275   }
1276 
1277   size_t max_heap = align_size_down(MaxHeapSize,
1278                                     CardTableRS::ct_max_alignment_constraint());
1279 
1280   // Now make adjustments for CMS
1281   intx   tenuring_default = (intx)6;
1282   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1283 
1284   // Preferred young gen size for "short" pauses:
1285   // upper bound depends on # of threads and NewRatio.
1286   const uintx parallel_gc_threads =
1287     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1288   const size_t preferred_max_new_size_unaligned =
1289     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1290   size_t preferred_max_new_size =
1291     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1292 
1293   // Unless explicitly requested otherwise, size young gen
1294   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1295 
1296   // If either MaxNewSize or NewRatio is set on the command line,
1297   // assume the user is trying to set the size of the young gen.
1298   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1299 
1300     // Set MaxNewSize to our calculated preferred_max_new_size unless
1301     // NewSize was set on the command line and it is larger than
1302     // preferred_max_new_size.
1303     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1304       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1305     } else {
1306       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1307     }
1308     if (PrintGCDetails && Verbose) {
1309       // Too early to use gclog_or_tty
1310       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1311     }
1312 
1313     // Code along this path potentially sets NewSize and OldSize
1314     if (PrintGCDetails && Verbose) {
1315       // Too early to use gclog_or_tty
1316       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1317            " initial_heap_size:  " SIZE_FORMAT
1318            " max_heap: " SIZE_FORMAT,
1319            min_heap_size(), InitialHeapSize, max_heap);
1320     }
1321     size_t min_new = preferred_max_new_size;
1322     if (FLAG_IS_CMDLINE(NewSize)) {
1323       min_new = NewSize;
1324     }
1325     if (max_heap > min_new && min_heap_size() > min_new) {
1326       // Unless explicitly requested otherwise, make young gen
1327       // at least min_new, and at most preferred_max_new_size.
1328       if (FLAG_IS_DEFAULT(NewSize)) {
1329         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1330         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1331         if (PrintGCDetails && Verbose) {
1332           // Too early to use gclog_or_tty
1333           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1334         }
1335       }
1336       // Unless explicitly requested otherwise, size old gen
1337       // so it's NewRatio x of NewSize.
1338       if (FLAG_IS_DEFAULT(OldSize)) {
1339         if (max_heap > NewSize) {
1340           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1341           if (PrintGCDetails && Verbose) {
1342             // Too early to use gclog_or_tty
1343             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1344           }
1345         }
1346       }
1347     }
1348   }
1349   // Unless explicitly requested otherwise, definitely
1350   // promote all objects surviving "tenuring_default" scavenges.
1351   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1352       FLAG_IS_DEFAULT(SurvivorRatio)) {
1353     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1354   }
1355   // If we decided above (or user explicitly requested)
1356   // `promote all' (via MaxTenuringThreshold := 0),
1357   // prefer minuscule survivor spaces so as not to waste
1358   // space for (non-existent) survivors
1359   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1360     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1361   }
1362   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1363   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1364   // This is done in order to make ParNew+CMS configuration to work
1365   // with YoungPLABSize and OldPLABSize options.
1366   // See CR 6362902.
1367   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1368     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1369       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1370       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1371       // the value (either from the command line or ergonomics) of
1372       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1373       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1374     } else {
1375       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1376       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1377       // we'll let it to take precedence.
1378       jio_fprintf(defaultStream::error_stream(),
1379                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1380                   " options are specified for the CMS collector."
1381                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1382     }
1383   }
1384   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1385     // OldPLAB sizing manually turned off: Use a larger default setting,
1386     // unless it was manually specified. This is because a too-low value
1387     // will slow down scavenges.
1388     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1389       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1390     }
1391   }
1392   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1393   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1394   // If either of the static initialization defaults have changed, note this
1395   // modification.
1396   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1397     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1398   }
1399 
1400   if (PrintGCDetails && Verbose) {
1401     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1402       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1403     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1404   }
1405 }
1406 #endif // INCLUDE_ALL_GCS
1407 
1408 void set_object_alignment() {
1409   // Object alignment.
1410   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1411   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1412   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1413   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1414   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1415   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1416 
1417   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1418   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1419 
1420   // Oop encoding heap max
1421   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1422 
1423 #if INCLUDE_ALL_GCS
1424   // Set CMS global values
1425   CompactibleFreeListSpace::set_cms_values();
1426 #endif // INCLUDE_ALL_GCS
1427 }
1428 
1429 bool verify_object_alignment() {
1430   // Object alignment.
1431   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1432     jio_fprintf(defaultStream::error_stream(),
1433                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1434                 (int)ObjectAlignmentInBytes);
1435     return false;
1436   }
1437   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1438     jio_fprintf(defaultStream::error_stream(),
1439                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1440                 (int)ObjectAlignmentInBytes, BytesPerLong);
1441     return false;
1442   }
1443   // It does not make sense to have big object alignment
1444   // since a space lost due to alignment will be greater
1445   // then a saved space from compressed oops.
1446   if ((int)ObjectAlignmentInBytes > 256) {
1447     jio_fprintf(defaultStream::error_stream(),
1448                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1449                 (int)ObjectAlignmentInBytes);
1450     return false;
1451   }
1452   // In case page size is very small.
1453   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1454     jio_fprintf(defaultStream::error_stream(),
1455                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1456                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1457     return false;
1458   }
1459   if(SurvivorAlignmentInBytes == 0) {
1460     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1461   } else {
1462     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1463       jio_fprintf(defaultStream::error_stream(),
1464             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1465             (int)SurvivorAlignmentInBytes);
1466       return false;
1467     }
1468     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1469       jio_fprintf(defaultStream::error_stream(),
1470           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1471           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1472       return false;
1473     }
1474   }
1475   return true;
1476 }
1477 
1478 size_t Arguments::max_heap_for_compressed_oops() {
1479   // Avoid sign flip.
1480   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1481   // We need to fit both the NULL page and the heap into the memory budget, while
1482   // keeping alignment constraints of the heap. To guarantee the latter, as the
1483   // NULL page is located before the heap, we pad the NULL page to the conservative
1484   // maximum alignment that the GC may ever impose upon the heap.
1485   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1486                                                         _conservative_max_heap_alignment);
1487 
1488   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1489   NOT_LP64(ShouldNotReachHere(); return 0);
1490 }
1491 
1492 bool Arguments::should_auto_select_low_pause_collector() {
1493   if (UseAutoGCSelectPolicy &&
1494       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1495       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1496     if (PrintGCDetails) {
1497       // Cannot use gclog_or_tty yet.
1498       tty->print_cr("Automatic selection of the low pause collector"
1499        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1500     }
1501     return true;
1502   }
1503   return false;
1504 }
1505 
1506 void Arguments::set_use_compressed_oops() {
1507 #ifndef ZERO
1508 #ifdef _LP64
1509   // MaxHeapSize is not set up properly at this point, but
1510   // the only value that can override MaxHeapSize if we are
1511   // to use UseCompressedOops is InitialHeapSize.
1512   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1513 
1514   if (max_heap_size <= max_heap_for_compressed_oops()) {
1515 #if !defined(COMPILER1) || defined(TIERED)
1516     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1517       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1518     }
1519 #endif
1520 #ifdef _WIN64
1521     if (UseLargePages && UseCompressedOops) {
1522       // Cannot allocate guard pages for implicit checks in indexed addressing
1523       // mode, when large pages are specified on windows.
1524       // This flag could be switched ON if narrow oop base address is set to 0,
1525       // see code in Universe::initialize_heap().
1526       Universe::set_narrow_oop_use_implicit_null_checks(false);
1527     }
1528 #endif //  _WIN64
1529   } else {
1530     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1531       warning("Max heap size too large for Compressed Oops");
1532       FLAG_SET_DEFAULT(UseCompressedOops, false);
1533       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1534     }
1535   }
1536 #endif // _LP64
1537 #endif // ZERO
1538 }
1539 
1540 
1541 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1542 // set_use_compressed_oops().
1543 void Arguments::set_use_compressed_klass_ptrs() {
1544 #ifndef ZERO
1545 #ifdef _LP64
1546   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1547   if (!UseCompressedOops) {
1548     if (UseCompressedClassPointers) {
1549       warning("UseCompressedClassPointers requires UseCompressedOops");
1550     }
1551     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1552   } else {
1553     // Turn on UseCompressedClassPointers too
1554     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1555       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1556     }
1557     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1558     if (UseCompressedClassPointers) {
1559       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1560         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1561         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1562       }
1563     }
1564   }
1565 #endif // _LP64
1566 #endif // !ZERO
1567 }
1568 
1569 void Arguments::set_conservative_max_heap_alignment() {
1570   // The conservative maximum required alignment for the heap is the maximum of
1571   // the alignments imposed by several sources: any requirements from the heap
1572   // itself, the collector policy and the maximum page size we may run the VM
1573   // with.
1574   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1575 #if INCLUDE_ALL_GCS
1576   if (UseParallelGC) {
1577     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1578   } else if (UseG1GC) {
1579     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1580   }
1581 #endif // INCLUDE_ALL_GCS
1582   _conservative_max_heap_alignment = MAX4(heap_alignment,
1583                                           (size_t)os::vm_allocation_granularity(),
1584                                           os::max_page_size(),
1585                                           CollectorPolicy::compute_heap_alignment());
1586 }
1587 
1588 void Arguments::select_gc_ergonomically() {
1589   if (os::is_server_class_machine()) {
1590     if (should_auto_select_low_pause_collector()) {
1591       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1592     } else {
1593       FLAG_SET_ERGO(bool, UseParallelGC, true);
1594     }
1595   }
1596 }
1597 
1598 void Arguments::select_gc() {
1599   if (!gc_selected()) {
1600     select_gc_ergonomically();
1601   }
1602 }
1603 
1604 void Arguments::set_ergonomics_flags() {
1605   select_gc();
1606 
1607 #ifdef COMPILER2
1608   // Shared spaces work fine with other GCs but causes bytecode rewriting
1609   // to be disabled, which hurts interpreter performance and decreases
1610   // server performance.  When -server is specified, keep the default off
1611   // unless it is asked for.  Future work: either add bytecode rewriting
1612   // at link time, or rewrite bytecodes in non-shared methods.
1613   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1614       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1615     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1616   }
1617 #endif
1618 
1619   set_conservative_max_heap_alignment();
1620 
1621 #ifndef ZERO
1622 #ifdef _LP64
1623   set_use_compressed_oops();
1624 
1625   // set_use_compressed_klass_ptrs() must be called after calling
1626   // set_use_compressed_oops().
1627   set_use_compressed_klass_ptrs();
1628 
1629   // Also checks that certain machines are slower with compressed oops
1630   // in vm_version initialization code.
1631 #endif // _LP64
1632 #endif // !ZERO
1633 }
1634 
1635 void Arguments::set_parallel_gc_flags() {
1636   assert(UseParallelGC || UseParallelOldGC, "Error");
1637   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1638   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1639     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1640   }
1641   FLAG_SET_DEFAULT(UseParallelGC, true);
1642 
1643   // If no heap maximum was requested explicitly, use some reasonable fraction
1644   // of the physical memory, up to a maximum of 1GB.
1645   FLAG_SET_DEFAULT(ParallelGCThreads,
1646                    Abstract_VM_Version::parallel_worker_threads());
1647   if (ParallelGCThreads == 0) {
1648     jio_fprintf(defaultStream::error_stream(),
1649         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1650     vm_exit(1);
1651   }
1652 
1653   if (UseAdaptiveSizePolicy) {
1654     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1655     // unless the user actually sets these flags.
1656     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1657       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1658       _min_heap_free_ratio = MinHeapFreeRatio;
1659     }
1660     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1661       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1662       _max_heap_free_ratio = MaxHeapFreeRatio;
1663     }
1664   }
1665 
1666   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1667   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1668   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1669   // See CR 6362902 for details.
1670   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1671     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1672        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1673     }
1674     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1675       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1676     }
1677   }
1678 
1679   if (UseParallelOldGC) {
1680     // Par compact uses lower default values since they are treated as
1681     // minimums.  These are different defaults because of the different
1682     // interpretation and are not ergonomically set.
1683     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1684       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1685     }
1686   }
1687 }
1688 
1689 void Arguments::set_g1_gc_flags() {
1690   assert(UseG1GC, "Error");
1691 #ifdef COMPILER1
1692   FastTLABRefill = false;
1693 #endif
1694   FLAG_SET_DEFAULT(ParallelGCThreads,
1695                      Abstract_VM_Version::parallel_worker_threads());
1696   if (ParallelGCThreads == 0) {
1697     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1698     }
1699 
1700 #if INCLUDE_ALL_GCS
1701   if (G1ConcRefinementThreads == 0) {
1702     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1703   }
1704 #endif
1705 
1706   // MarkStackSize will be set (if it hasn't been set by the user)
1707   // when concurrent marking is initialized.
1708   // Its value will be based upon the number of parallel marking threads.
1709   // But we do set the maximum mark stack size here.
1710   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1711     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1712   }
1713 
1714   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1715     // In G1, we want the default GC overhead goal to be higher than
1716     // say in PS. So we set it here to 10%. Otherwise the heap might
1717     // be expanded more aggressively than we would like it to. In
1718     // fact, even 10% seems to not be high enough in some cases
1719     // (especially small GC stress tests that the main thing they do
1720     // is allocation). We might consider increase it further.
1721     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1722   }
1723 
1724   if (PrintGCDetails && Verbose) {
1725     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1726       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1727     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1728   }
1729 }
1730 
1731 #if !INCLUDE_ALL_GCS
1732 #ifdef ASSERT
1733 static bool verify_serial_gc_flags() {
1734   return (UseSerialGC &&
1735         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1736           UseParallelGC || UseParallelOldGC));
1737 }
1738 #endif // ASSERT
1739 #endif // INCLUDE_ALL_GCS
1740 
1741 void Arguments::set_gc_specific_flags() {
1742 #if INCLUDE_ALL_GCS
1743   // Set per-collector flags
1744   if (UseParallelGC || UseParallelOldGC) {
1745     set_parallel_gc_flags();
1746   } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1747     set_cms_and_parnew_gc_flags();
1748   } else if (UseParNewGC) {  // Skipped if CMS is set above
1749     set_parnew_gc_flags();
1750   } else if (UseG1GC) {
1751     set_g1_gc_flags();
1752   }
1753   check_deprecated_gcs();
1754   check_deprecated_gc_flags();
1755   if (AssumeMP && !UseSerialGC) {
1756     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1757       warning("If the number of processors is expected to increase from one, then"
1758               " you should configure the number of parallel GC threads appropriately"
1759               " using -XX:ParallelGCThreads=N");
1760     }
1761   }
1762   if (MinHeapFreeRatio == 100) {
1763     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1764     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1765   }
1766 
1767   // If class unloading is disabled, also disable concurrent class unloading.
1768   if (!ClassUnloading) {
1769     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1770     FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1771     FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1772   }
1773 #else // INCLUDE_ALL_GCS
1774   assert(verify_serial_gc_flags(), "SerialGC unset");
1775 #endif // INCLUDE_ALL_GCS
1776 }
1777 
1778 julong Arguments::limit_by_allocatable_memory(julong limit) {
1779   julong max_allocatable;
1780   julong result = limit;
1781   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1782     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1783   }
1784   return result;
1785 }
1786 
1787 void Arguments::set_heap_size() {
1788   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1789     // Deprecated flag
1790     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1791   }
1792 
1793   julong phys_mem =
1794     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1795                             : (julong)MaxRAM;
1796 
1797   // Experimental support for CGroup memory limits
1798   if (UseCGroupMemoryLimitForHeap) {
1799     // This is a rough indicator that a CGroup limit may be in force
1800     // for this process
1801     const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1802     FILE *fp = fopen(lim_file, "r");
1803     if (fp != NULL) {
1804       julong cgroup_max = 0;
1805       int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1806       if (ret == 1 && cgroup_max > 0) {
1807         // If unlimited, cgroup_max will be a very large, but unspecified
1808         // value, so use initial phys_mem as a limit
1809         if (PrintGCDetails && Verbose) {
1810           // Cannot use gclog_or_tty yet.
1811           tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1812                         JULONG_FORMAT "MB) and initial phys_mem ("
1813                         JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1814         }
1815         phys_mem = MIN2(cgroup_max, phys_mem);
1816       } else {
1817         warning("Unable to read/parse cgroup memory limit from %s: %s",
1818                 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1819       }
1820       fclose(fp);
1821     } else {
1822       warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1823     }
1824   }
1825 
1826   // Convert Fraction to Precentage values
1827   if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1828       !FLAG_IS_DEFAULT(MaxRAMFraction))
1829     MaxRAMPercentage = 100.0 / MaxRAMFraction;
1830 
1831    if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1832        !FLAG_IS_DEFAULT(MinRAMFraction))
1833      MinRAMPercentage = 100.0 / MinRAMFraction;
1834 
1835    if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1836        !FLAG_IS_DEFAULT(InitialRAMFraction))
1837      InitialRAMPercentage = 100.0 / InitialRAMFraction;
1838 
1839   // If the maximum heap size has not been set with -Xmx,
1840   // then set it as fraction of the size of physical memory,
1841   // respecting the maximum and minimum sizes of the heap.
1842   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1843     julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1844     const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1845     if (reasonable_min < MaxHeapSize) {
1846       // Small physical memory, so use a minimum fraction of it for the heap
1847       reasonable_max = reasonable_min;
1848     } else {
1849       // Not-small physical memory, so require a heap at least
1850       // as large as MaxHeapSize
1851       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1852     }
1853 
1854     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1855       // Limit the heap size to ErgoHeapSizeLimit
1856       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1857     }
1858     if (UseCompressedOops) {
1859       // Limit the heap size to the maximum possible when using compressed oops
1860       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1861       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1862         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1863         // but it should be not less than default MaxHeapSize.
1864         max_coop_heap -= HeapBaseMinAddress;
1865       }
1866       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1867     }
1868     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1869 
1870     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1871       // An initial heap size was specified on the command line,
1872       // so be sure that the maximum size is consistent.  Done
1873       // after call to limit_by_allocatable_memory because that
1874       // method might reduce the allocation size.
1875       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1876     }
1877 
1878     if (PrintGCDetails && Verbose) {
1879       // Cannot use gclog_or_tty yet.
1880       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1881     }
1882     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1883   }
1884 
1885   // If the minimum or initial heap_size have not been set or requested to be set
1886   // ergonomically, set them accordingly.
1887   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1888     julong reasonable_minimum = (julong)(OldSize + NewSize);
1889 
1890     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1891 
1892     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1893 
1894     if (InitialHeapSize == 0) {
1895       julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1896 
1897       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1898       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1899 
1900       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1901 
1902       if (PrintGCDetails && Verbose) {
1903         // Cannot use gclog_or_tty yet.
1904         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1905       }
1906       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1907     }
1908     // If the minimum heap size has not been set (via -Xms),
1909     // synchronize with InitialHeapSize to avoid errors with the default value.
1910     if (min_heap_size() == 0) {
1911       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1912       if (PrintGCDetails && Verbose) {
1913         // Cannot use gclog_or_tty yet.
1914         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1915       }
1916     }
1917   }
1918 }
1919 
1920 // This option inspects the machine and attempts to set various
1921 // parameters to be optimal for long-running, memory allocation
1922 // intensive jobs.  It is intended for machines with large
1923 // amounts of cpu and memory.
1924 jint Arguments::set_aggressive_heap_flags() {
1925   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1926   // VM, but we may not be able to represent the total physical memory
1927   // available (like having 8gb of memory on a box but using a 32bit VM).
1928   // Thus, we need to make sure we're using a julong for intermediate
1929   // calculations.
1930   julong initHeapSize;
1931   julong total_memory = os::physical_memory();
1932 
1933   if (total_memory < (julong) 256 * M) {
1934     jio_fprintf(defaultStream::error_stream(),
1935             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1936     vm_exit(1);
1937   }
1938 
1939   // The heap size is half of available memory, or (at most)
1940   // all of possible memory less 160mb (leaving room for the OS
1941   // when using ISM).  This is the maximum; because adaptive sizing
1942   // is turned on below, the actual space used may be smaller.
1943 
1944   initHeapSize = MIN2(total_memory / (julong) 2,
1945                       total_memory - (julong) 160 * M);
1946 
1947   initHeapSize = limit_by_allocatable_memory(initHeapSize);
1948 
1949   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1950     FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
1951     FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
1952     // Currently the minimum size and the initial heap sizes are the same.
1953     set_min_heap_size(initHeapSize);
1954   }
1955   if (FLAG_IS_DEFAULT(NewSize)) {
1956     // Make the young generation 3/8ths of the total heap.
1957     FLAG_SET_CMDLINE(uintx, NewSize,
1958             ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
1959     FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
1960   }
1961 
1962 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
1963   FLAG_SET_DEFAULT(UseLargePages, true);
1964 #endif
1965 
1966   // Increase some data structure sizes for efficiency
1967   FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
1968   FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
1969   FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
1970 
1971   // See the OldPLABSize comment below, but replace 'after promotion'
1972   // with 'after copying'.  YoungPLABSize is the size of the survivor
1973   // space per-gc-thread buffers.  The default is 4kw.
1974   FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K);     // Note: this is in words
1975 
1976   // OldPLABSize is the size of the buffers in the old gen that
1977   // UseParallelGC uses to promote live data that doesn't fit in the
1978   // survivor spaces.  At any given time, there's one for each gc thread.
1979   // The default size is 1kw. These buffers are rarely used, since the
1980   // survivor spaces are usually big enough.  For specjbb, however, there
1981   // are occasions when there's lots of live data in the young gen
1982   // and we end up promoting some of it.  We don't have a definite
1983   // explanation for why bumping OldPLABSize helps, but the theory
1984   // is that a bigger PLAB results in retaining something like the
1985   // original allocation order after promotion, which improves mutator
1986   // locality.  A minor effect may be that larger PLABs reduce the
1987   // number of PLAB allocation events during gc.  The value of 8kw
1988   // was arrived at by experimenting with specjbb.
1989   FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K);      // Note: this is in words
1990 
1991   // Enable parallel GC and adaptive generation sizing
1992   FLAG_SET_CMDLINE(bool, UseParallelGC, true);
1993 
1994   // Encourage steady state memory management
1995   FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
1996 
1997   // This appears to improve mutator locality
1998   FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1999 
2000   // Get around early Solaris scheduling bug
2001   // (affinity vs other jobs on system)
2002   // but disallow DR and offlining (5008695).
2003   FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2004 
2005   return JNI_OK;
2006 }
2007 
2008 // This must be called after ergonomics because we want bytecode rewriting
2009 // if the server compiler is used, or if UseSharedSpaces is disabled.
2010 void Arguments::set_bytecode_flags() {
2011   // Better not attempt to store into a read-only space.
2012   if (UseSharedSpaces) {
2013     FLAG_SET_DEFAULT(RewriteBytecodes, false);
2014     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2015   }
2016 
2017   if (!RewriteBytecodes) {
2018     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2019   }
2020 }
2021 
2022 // Aggressive optimization flags  -XX:+AggressiveOpts
2023 void Arguments::set_aggressive_opts_flags() {
2024 #ifdef COMPILER2
2025   if (AggressiveUnboxing) {
2026     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2027       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2028     } else if (!EliminateAutoBox) {
2029       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2030       AggressiveUnboxing = false;
2031     }
2032     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2033       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2034     } else if (!DoEscapeAnalysis) {
2035       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2036       AggressiveUnboxing = false;
2037     }
2038   }
2039   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2040     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2041       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2042     }
2043     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2044       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2045     }
2046 
2047     // Feed the cache size setting into the JDK
2048     char buffer[1024];
2049     jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2050     add_property(buffer);
2051   }
2052   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2053     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2054   }
2055 #endif
2056 
2057   if (AggressiveOpts) {
2058 // Sample flag setting code
2059 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2060 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
2061 //    }
2062   }
2063 }
2064 
2065 //===========================================================================================================
2066 // Parsing of java.compiler property
2067 
2068 void Arguments::process_java_compiler_argument(char* arg) {
2069   // For backwards compatibility, Djava.compiler=NONE or ""
2070   // causes us to switch to -Xint mode UNLESS -Xdebug
2071   // is also specified.
2072   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2073     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2074   }
2075 }
2076 
2077 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2078   _sun_java_launcher = strdup(launcher);
2079   if (strcmp("gamma", _sun_java_launcher) == 0) {
2080     _created_by_gamma_launcher = true;
2081   }
2082 }
2083 
2084 bool Arguments::created_by_java_launcher() {
2085   assert(_sun_java_launcher != NULL, "property must have value");
2086   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2087 }
2088 
2089 bool Arguments::created_by_gamma_launcher() {
2090   return _created_by_gamma_launcher;
2091 }
2092 
2093 //===========================================================================================================
2094 // Parsing of main arguments
2095 
2096 bool Arguments::verify_interval(uintx val, uintx min,
2097                                 uintx max, const char* name) {
2098   // Returns true iff value is in the inclusive interval [min..max]
2099   // false, otherwise.
2100   if (val >= min && val <= max) {
2101     return true;
2102   }
2103   jio_fprintf(defaultStream::error_stream(),
2104               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2105               " and " UINTX_FORMAT "\n",
2106               name, val, min, max);
2107   return false;
2108 }
2109 
2110 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2111   // Returns true if given value is at least specified min threshold
2112   // false, otherwise.
2113   if (val >= min ) {
2114       return true;
2115   }
2116   jio_fprintf(defaultStream::error_stream(),
2117               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2118               name, val, min);
2119   return false;
2120 }
2121 
2122 bool Arguments::verify_percentage(uintx value, const char* name) {
2123   if (is_percentage(value)) {
2124     return true;
2125   }
2126   jio_fprintf(defaultStream::error_stream(),
2127               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2128               name, value);
2129   return false;
2130 }
2131 
2132 // check if do gclog rotation
2133 // +UseGCLogFileRotation is a must,
2134 // no gc log rotation when log file not supplied or
2135 // NumberOfGCLogFiles is 0
2136 void check_gclog_consistency() {
2137   if (UseGCLogFileRotation) {
2138     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2139       jio_fprintf(defaultStream::output_stream(),
2140                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2141                   "where num_of_file > 0\n"
2142                   "GC log rotation is turned off\n");
2143       UseGCLogFileRotation = false;
2144     }
2145   }
2146 
2147   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2148     FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2149     jio_fprintf(defaultStream::output_stream(),
2150                 "GCLogFileSize changed to minimum 8K\n");
2151   }
2152 }
2153 
2154 // This function is called for -Xloggc:<filename>, it can be used
2155 // to check if a given file name(or string) conforms to the following
2156 // specification:
2157 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2158 // %p and %t only allowed once. We only limit usage of filename not path
2159 bool is_filename_valid(const char *file_name) {
2160   const char* p = file_name;
2161   char file_sep = os::file_separator()[0];
2162   const char* cp;
2163   // skip prefix path
2164   for (cp = file_name; *cp != '\0'; cp++) {
2165     if (*cp == '/' || *cp == file_sep) {
2166       p = cp + 1;
2167     }
2168   }
2169 
2170   int count_p = 0;
2171   int count_t = 0;
2172   while (*p != '\0') {
2173     if ((*p >= '0' && *p <= '9') ||
2174         (*p >= 'A' && *p <= 'Z') ||
2175         (*p >= 'a' && *p <= 'z') ||
2176          *p == '-'               ||
2177          *p == '_'               ||
2178          *p == '.') {
2179        p++;
2180        continue;
2181     }
2182     if (*p == '%') {
2183       if(*(p + 1) == 'p') {
2184         p += 2;
2185         count_p ++;
2186         continue;
2187       }
2188       if (*(p + 1) == 't') {
2189         p += 2;
2190         count_t ++;
2191         continue;
2192       }
2193     }
2194     return false;
2195   }
2196   return count_p < 2 && count_t < 2;
2197 }
2198 
2199 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2200   if (!is_percentage(min_heap_free_ratio)) {
2201     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2202     return false;
2203   }
2204   if (min_heap_free_ratio > MaxHeapFreeRatio) {
2205     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2206                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2207                   MaxHeapFreeRatio);
2208     return false;
2209   }
2210   // This does not set the flag itself, but stores the value in a safe place for later usage.
2211   _min_heap_free_ratio = min_heap_free_ratio;
2212   return true;
2213 }
2214 
2215 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2216   if (!is_percentage(max_heap_free_ratio)) {
2217     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2218     return false;
2219   }
2220   if (max_heap_free_ratio < MinHeapFreeRatio) {
2221     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2222                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2223                   MinHeapFreeRatio);
2224     return false;
2225   }
2226   // This does not set the flag itself, but stores the value in a safe place for later usage.
2227   _max_heap_free_ratio = max_heap_free_ratio;
2228   return true;
2229 }
2230 
2231 // Check consistency of GC selection
2232 bool Arguments::check_gc_consistency() {
2233   check_gclog_consistency();
2234   bool status = true;
2235   // Ensure that the user has not selected conflicting sets
2236   // of collectors. [Note: this check is merely a user convenience;
2237   // collectors over-ride each other so that only a non-conflicting
2238   // set is selected; however what the user gets is not what they
2239   // may have expected from the combination they asked for. It's
2240   // better to reduce user confusion by not allowing them to
2241   // select conflicting combinations.
2242   uint i = 0;
2243   if (UseSerialGC)                       i++;
2244   if (UseConcMarkSweepGC || UseParNewGC) i++;
2245   if (UseParallelGC || UseParallelOldGC) i++;
2246   if (UseG1GC)                           i++;
2247   if (i > 1) {
2248     jio_fprintf(defaultStream::error_stream(),
2249                 "Conflicting collector combinations in option list; "
2250                 "please refer to the release notes for the combinations "
2251                 "allowed\n");
2252     status = false;
2253   }
2254   return status;
2255 }
2256 
2257 void Arguments::check_deprecated_gcs() {
2258   if (UseConcMarkSweepGC && !UseParNewGC) {
2259     warning("Using the DefNew young collector with the CMS collector is deprecated "
2260         "and will likely be removed in a future release");
2261   }
2262 
2263   if (UseParNewGC && !UseConcMarkSweepGC) {
2264     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2265     // set up UseSerialGC properly, so that can't be used in the check here.
2266     warning("Using the ParNew young collector with the Serial old collector is deprecated "
2267         "and will likely be removed in a future release");
2268   }
2269 
2270   if (CMSIncrementalMode) {
2271     warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2272   }
2273 }
2274 
2275 void Arguments::check_deprecated_gc_flags() {
2276   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2277     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2278             "and will likely be removed in future release");
2279   }
2280   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2281     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2282         "Use MaxRAMFraction instead.");
2283   }
2284   if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2285     warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2286   }
2287   if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2288     warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2289   }
2290   if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2291     warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2292   }
2293 }
2294 
2295 // Check stack pages settings
2296 bool Arguments::check_stack_pages()
2297 {
2298   bool status = true;
2299   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2300   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2301   // greater stack shadow pages can't generate instruction to bang stack
2302   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2303   return status;
2304 }
2305 
2306 // Check the consistency of vm_init_args
2307 bool Arguments::check_vm_args_consistency() {
2308   // Method for adding checks for flag consistency.
2309   // The intent is to warn the user of all possible conflicts,
2310   // before returning an error.
2311   // Note: Needs platform-dependent factoring.
2312   bool status = true;
2313 
2314   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2315   // builds so the cost of stack banging can be measured.
2316 #if (defined(PRODUCT) && defined(SOLARIS))
2317   if (!UseBoundThreads && !UseStackBanging) {
2318     jio_fprintf(defaultStream::error_stream(),
2319                 "-UseStackBanging conflicts with -UseBoundThreads\n");
2320 
2321      status = false;
2322   }
2323 #endif
2324 
2325   if (TLABRefillWasteFraction == 0) {
2326     jio_fprintf(defaultStream::error_stream(),
2327                 "TLABRefillWasteFraction should be a denominator, "
2328                 "not " SIZE_FORMAT "\n",
2329                 TLABRefillWasteFraction);
2330     status = false;
2331   }
2332 
2333   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2334                               "AdaptiveSizePolicyWeight");
2335   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2336 
2337   // Divide by bucket size to prevent a large size from causing rollover when
2338   // calculating amount of memory needed to be allocated for the String table.
2339   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2340     (max_uintx / StringTable::bucket_size()), "StringTable size");
2341 
2342   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2343     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2344 
2345   {
2346     // Using "else if" below to avoid printing two error messages if min > max.
2347     // This will also prevent us from reporting both min>100 and max>100 at the
2348     // same time, but that is less annoying than printing two identical errors IMHO.
2349     FormatBuffer<80> err_msg("%s","");
2350     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2351       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2352       status = false;
2353     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2354       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2355       status = false;
2356     }
2357   }
2358 
2359   // Min/MaxMetaspaceFreeRatio
2360   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2361   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2362 
2363   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2364     jio_fprintf(defaultStream::error_stream(),
2365                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2366                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2367                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2368                 MinMetaspaceFreeRatio,
2369                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2370                 MaxMetaspaceFreeRatio);
2371     status = false;
2372   }
2373 
2374   // Trying to keep 100% free is not practical
2375   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2376 
2377   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2378     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2379   }
2380 
2381   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2382     // Settings to encourage splitting.
2383     if (!FLAG_IS_CMDLINE(NewRatio)) {
2384       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2385     }
2386     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2387       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2388     }
2389   }
2390 
2391   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2392   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2393   if (GCTimeLimit == 100) {
2394     // Turn off gc-overhead-limit-exceeded checks
2395     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2396   }
2397 
2398   status = status && check_gc_consistency();
2399   status = status && check_stack_pages();
2400 
2401   if (CMSIncrementalMode) {
2402     if (!UseConcMarkSweepGC) {
2403       jio_fprintf(defaultStream::error_stream(),
2404                   "error:  invalid argument combination.\n"
2405                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2406                   "selected in order\nto use CMSIncrementalMode.\n");
2407       status = false;
2408     } else {
2409       status = status && verify_percentage(CMSIncrementalDutyCycle,
2410                                   "CMSIncrementalDutyCycle");
2411       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2412                                   "CMSIncrementalDutyCycleMin");
2413       status = status && verify_percentage(CMSIncrementalSafetyFactor,
2414                                   "CMSIncrementalSafetyFactor");
2415       status = status && verify_percentage(CMSIncrementalOffset,
2416                                   "CMSIncrementalOffset");
2417       status = status && verify_percentage(CMSExpAvgFactor,
2418                                   "CMSExpAvgFactor");
2419       // If it was not set on the command line, set
2420       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2421       if (CMSInitiatingOccupancyFraction < 0) {
2422         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2423       }
2424     }
2425   }
2426 
2427   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2428   // insists that we hold the requisite locks so that the iteration is
2429   // MT-safe. For the verification at start-up and shut-down, we don't
2430   // yet have a good way of acquiring and releasing these locks,
2431   // which are not visible at the CollectedHeap level. We want to
2432   // be able to acquire these locks and then do the iteration rather
2433   // than just disable the lock verification. This will be fixed under
2434   // bug 4788986.
2435   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2436     if (VerifyDuringStartup) {
2437       warning("Heap verification at start-up disabled "
2438               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2439       VerifyDuringStartup = false; // Disable verification at start-up
2440     }
2441 
2442     if (VerifyBeforeExit) {
2443       warning("Heap verification at shutdown disabled "
2444               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2445       VerifyBeforeExit = false; // Disable verification at shutdown
2446     }
2447   }
2448 
2449   // Note: only executed in non-PRODUCT mode
2450   if (!UseAsyncConcMarkSweepGC &&
2451       (ExplicitGCInvokesConcurrent ||
2452        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2453     jio_fprintf(defaultStream::error_stream(),
2454                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2455                 " with -UseAsyncConcMarkSweepGC");
2456     status = false;
2457   }
2458 
2459   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2460 
2461 #if INCLUDE_ALL_GCS
2462   if (UseG1GC) {
2463     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2464     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2465     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2466 
2467     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2468                                          "InitiatingHeapOccupancyPercent");
2469     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2470                                         "G1RefProcDrainInterval");
2471     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2472                                         "G1ConcMarkStepDurationMillis");
2473     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2474                                        "G1ConcRSHotCardLimit");
2475     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2476                                        "G1ConcRSLogCacheSize");
2477     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2478                                        "StringDeduplicationAgeThreshold");
2479   }
2480   if (UseConcMarkSweepGC) {
2481     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2482     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2483     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2484     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2485 
2486     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2487 
2488     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2489     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2490     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2491 
2492     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2493 
2494     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2495     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2496 
2497     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2498     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2499     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2500 
2501     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2502 
2503     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2504 
2505     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2506     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2507     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2508     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2509     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2510   }
2511 
2512   if (UseParallelGC || UseParallelOldGC) {
2513     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2514     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2515 
2516     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2517     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2518 
2519     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2520     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2521 
2522     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2523 
2524     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2525   }
2526 #endif // INCLUDE_ALL_GCS
2527 
2528   status = status && verify_interval(RefDiscoveryPolicy,
2529                                      ReferenceProcessor::DiscoveryPolicyMin,
2530                                      ReferenceProcessor::DiscoveryPolicyMax,
2531                                      "RefDiscoveryPolicy");
2532 
2533   // Limit the lower bound of this flag to 1 as it is used in a division
2534   // expression.
2535   status = status && verify_interval(TLABWasteTargetPercent,
2536                                      1, 100, "TLABWasteTargetPercent");
2537 
2538   status = status && verify_object_alignment();
2539 
2540   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2541                                       "CompressedClassSpaceSize");
2542 
2543   status = status && verify_interval(MarkStackSizeMax,
2544                                   1, (max_jint - 1), "MarkStackSizeMax");
2545   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2546 
2547   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2548 
2549   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2550 
2551   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2552 
2553   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2554   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2555 
2556   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2557 
2558   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2559   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2560   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2561   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2562 
2563   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2564   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2565 
2566   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2567   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2568   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2569 
2570   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2571   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2572 
2573   // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2574   // just for that, so hardcode here.
2575   status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2576   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2577   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2578   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2579 
2580   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2581 #ifdef COMPILER1
2582   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2583 #endif
2584 
2585   if (PrintNMTStatistics) {
2586 #if INCLUDE_NMT
2587     if (MemTracker::tracking_level() == NMT_off) {
2588 #endif // INCLUDE_NMT
2589       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2590       PrintNMTStatistics = false;
2591 #if INCLUDE_NMT
2592     }
2593 #endif
2594   }
2595 
2596   // Need to limit the extent of the padding to reasonable size.
2597   // 8K is well beyond the reasonable HW cache line size, even with the
2598   // aggressive prefetching, while still leaving the room for segregating
2599   // among the distinct pages.
2600   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2601     jio_fprintf(defaultStream::error_stream(),
2602                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2603                 ContendedPaddingWidth, 0, 8192);
2604     status = false;
2605   }
2606 
2607   // Need to enforce the padding not to break the existing field alignments.
2608   // It is sufficient to check against the largest type size.
2609   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2610     jio_fprintf(defaultStream::error_stream(),
2611                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2612                 ContendedPaddingWidth, BytesPerLong);
2613     status = false;
2614   }
2615 
2616   // Check lower bounds of the code cache
2617   // Template Interpreter code is approximately 3X larger in debug builds.
2618   uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2619   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2620     jio_fprintf(defaultStream::error_stream(),
2621                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2622                 os::vm_page_size()/K);
2623     status = false;
2624   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2625     jio_fprintf(defaultStream::error_stream(),
2626                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2627                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2628     status = false;
2629   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2630     jio_fprintf(defaultStream::error_stream(),
2631                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2632                 min_code_cache_size/K);
2633     status = false;
2634   } else if (ReservedCodeCacheSize > 2*G) {
2635     // Code cache size larger than MAXINT is not supported.
2636     jio_fprintf(defaultStream::error_stream(),
2637                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2638                 (2*G)/M);
2639     status = false;
2640   }
2641 
2642   status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2643   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2644 
2645   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2646     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2647   }
2648 
2649 #ifdef COMPILER1
2650   status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2651 #endif
2652 
2653   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2654   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2655   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2656   // Check the minimum number of compiler threads
2657   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2658 
2659   return status;
2660 }
2661 
2662 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2663   const char* option_type) {
2664   if (ignore) return false;
2665 
2666   const char* spacer = " ";
2667   if (option_type == NULL) {
2668     option_type = ++spacer; // Set both to the empty string.
2669   }
2670 
2671   if (os::obsolete_option(option)) {
2672     jio_fprintf(defaultStream::error_stream(),
2673                 "Obsolete %s%soption: %s\n", option_type, spacer,
2674       option->optionString);
2675     return false;
2676   } else {
2677     jio_fprintf(defaultStream::error_stream(),
2678                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2679       option->optionString);
2680     return true;
2681   }
2682 }
2683 
2684 static const char* user_assertion_options[] = {
2685   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2686 };
2687 
2688 static const char* system_assertion_options[] = {
2689   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2690 };
2691 
2692 // Return true if any of the strings in null-terminated array 'names' matches.
2693 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2694 // the option must match exactly.
2695 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2696   bool tail_allowed) {
2697   for (/* empty */; *names != NULL; ++names) {
2698     if (match_option(option, *names, tail)) {
2699       if (**tail == '\0' || tail_allowed && **tail == ':') {
2700         return true;
2701       }
2702     }
2703   }
2704   return false;
2705 }
2706 
2707 bool Arguments::parse_uintx(const char* value,
2708                             uintx* uintx_arg,
2709                             uintx min_size) {
2710 
2711   // Check the sign first since atomull() parses only unsigned values.
2712   bool value_is_positive = !(*value == '-');
2713 
2714   if (value_is_positive) {
2715     julong n;
2716     bool good_return = atomull(value, &n);
2717     if (good_return) {
2718       bool above_minimum = n >= min_size;
2719       bool value_is_too_large = n > max_uintx;
2720 
2721       if (above_minimum && !value_is_too_large) {
2722         *uintx_arg = n;
2723         return true;
2724       }
2725     }
2726   }
2727   return false;
2728 }
2729 
2730 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2731                                                   julong* long_arg,
2732                                                   julong min_size) {
2733   if (!atomull(s, long_arg)) return arg_unreadable;
2734   return check_memory_size(*long_arg, min_size);
2735 }
2736 
2737 // Parse JavaVMInitArgs structure
2738 
2739 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2740   // For components of the system classpath.
2741   SysClassPath scp(Arguments::get_sysclasspath());
2742   bool scp_assembly_required = false;
2743 
2744   // Save default settings for some mode flags
2745   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2746   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2747   Arguments::_ClipInlining             = ClipInlining;
2748   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2749 
2750   // Setup flags for mixed which is the default
2751   set_mode_flags(_mixed);
2752 
2753   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2754   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2755   if (result != JNI_OK) {
2756     return result;
2757   }
2758 
2759   // Parse JavaVMInitArgs structure passed in
2760   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2761   if (result != JNI_OK) {
2762     return result;
2763   }
2764 
2765   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2766   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2767   if (result != JNI_OK) {
2768     return result;
2769   }
2770 
2771   // We need to ensure processor and memory resources have been properly
2772   // configured - which may rely on arguments we just processed - before
2773   // doing the final argument processing. Any argument processing that
2774   // needs to know about processor and memory resources must occur after
2775   // this point.
2776 
2777   os::init_container_support();
2778 
2779   // Do final processing now that all arguments have been parsed
2780   result = finalize_vm_init_args(&scp, scp_assembly_required);
2781   if (result != JNI_OK) {
2782     return result;
2783   }
2784 
2785   return JNI_OK;
2786 }
2787 
2788 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2789 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2790 // are dealing with -agentpath (case where name is a path), otherwise with
2791 // -agentlib
2792 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2793   char *_name;
2794   const char *_hprof = "hprof", *_jdwp = "jdwp";
2795   size_t _len_hprof, _len_jdwp, _len_prefix;
2796 
2797   if (is_path) {
2798     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2799       return false;
2800     }
2801 
2802     _name++;  // skip past last path separator
2803     _len_prefix = strlen(JNI_LIB_PREFIX);
2804 
2805     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2806       return false;
2807     }
2808 
2809     _name += _len_prefix;
2810     _len_hprof = strlen(_hprof);
2811     _len_jdwp = strlen(_jdwp);
2812 
2813     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2814       _name += _len_hprof;
2815     }
2816     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2817       _name += _len_jdwp;
2818     }
2819     else {
2820       return false;
2821     }
2822 
2823     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2824       return false;
2825     }
2826 
2827     return true;
2828   }
2829 
2830   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2831     return true;
2832   }
2833 
2834   return false;
2835 }
2836 
2837 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2838                                        SysClassPath* scp_p,
2839                                        bool* scp_assembly_required_p,
2840                                        Flag::Flags origin) {
2841   // Remaining part of option string
2842   const char* tail;
2843 
2844   // iterate over arguments
2845   for (int index = 0; index < args->nOptions; index++) {
2846     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2847 
2848     const JavaVMOption* option = args->options + index;
2849 
2850     if (!match_option(option, "-Djava.class.path", &tail) &&
2851         !match_option(option, "-Dsun.java.command", &tail) &&
2852         !match_option(option, "-Dsun.java.launcher", &tail)) {
2853 
2854         // add all jvm options to the jvm_args string. This string
2855         // is used later to set the java.vm.args PerfData string constant.
2856         // the -Djava.class.path and the -Dsun.java.command options are
2857         // omitted from jvm_args string as each have their own PerfData
2858         // string constant object.
2859         build_jvm_args(option->optionString);
2860     }
2861 
2862     // -verbose:[class/gc/jni]
2863     if (match_option(option, "-verbose", &tail)) {
2864       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2865         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2866         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2867       } else if (!strcmp(tail, ":gc")) {
2868         FLAG_SET_CMDLINE(bool, PrintGC, true);
2869       } else if (!strcmp(tail, ":jni")) {
2870         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2871       }
2872     // -da / -ea / -disableassertions / -enableassertions
2873     // These accept an optional class/package name separated by a colon, e.g.,
2874     // -da:java.lang.Thread.
2875     } else if (match_option(option, user_assertion_options, &tail, true)) {
2876       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2877       if (*tail == '\0') {
2878         JavaAssertions::setUserClassDefault(enable);
2879       } else {
2880         assert(*tail == ':', "bogus match by match_option()");
2881         JavaAssertions::addOption(tail + 1, enable);
2882       }
2883     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2884     } else if (match_option(option, system_assertion_options, &tail, false)) {
2885       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2886       JavaAssertions::setSystemClassDefault(enable);
2887     // -bootclasspath:
2888     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2889       scp_p->reset_path(tail);
2890       *scp_assembly_required_p = true;
2891     // -bootclasspath/a:
2892     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2893       scp_p->add_suffix(tail);
2894       *scp_assembly_required_p = true;
2895     // -bootclasspath/p:
2896     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2897       scp_p->add_prefix(tail);
2898       *scp_assembly_required_p = true;
2899     // -Xrun
2900     } else if (match_option(option, "-Xrun", &tail)) {
2901       if (tail != NULL) {
2902         const char* pos = strchr(tail, ':');
2903         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2904         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2905         name[len] = '\0';
2906 
2907         char *options = NULL;
2908         if(pos != NULL) {
2909           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2910           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2911         }
2912 #if !INCLUDE_JVMTI
2913         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2914           jio_fprintf(defaultStream::error_stream(),
2915             "Profiling and debugging agents are not supported in this VM\n");
2916           return JNI_ERR;
2917         }
2918 #endif // !INCLUDE_JVMTI
2919         add_init_library(name, options);
2920       }
2921     // -agentlib and -agentpath
2922     } else if (match_option(option, "-agentlib:", &tail) ||
2923           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2924       if(tail != NULL) {
2925         const char* pos = strchr(tail, '=');
2926         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2927         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2928         name[len] = '\0';
2929 
2930         char *options = NULL;
2931         if(pos != NULL) {
2932           size_t length = strlen(pos + 1) + 1;
2933           options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2934           jio_snprintf(options, length, "%s", pos + 1);
2935         }
2936 #if !INCLUDE_JVMTI
2937         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2938           jio_fprintf(defaultStream::error_stream(),
2939             "Profiling and debugging agents are not supported in this VM\n");
2940           return JNI_ERR;
2941         }
2942 #endif // !INCLUDE_JVMTI
2943         add_init_agent(name, options, is_absolute_path);
2944       }
2945     // -javaagent
2946     } else if (match_option(option, "-javaagent:", &tail)) {
2947 #if !INCLUDE_JVMTI
2948       jio_fprintf(defaultStream::error_stream(),
2949         "Instrumentation agents are not supported in this VM\n");
2950       return JNI_ERR;
2951 #else
2952       if(tail != NULL) {
2953         size_t length = strlen(tail) + 1;
2954         char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2955         jio_snprintf(options, length, "%s", tail);
2956         add_init_agent("instrument", options, false);
2957       }
2958 #endif // !INCLUDE_JVMTI
2959     // -Xnoclassgc
2960     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2961       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2962     // -Xincgc: i-CMS
2963     } else if (match_option(option, "-Xincgc", &tail)) {
2964       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2965       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2966     // -Xnoincgc: no i-CMS
2967     } else if (match_option(option, "-Xnoincgc", &tail)) {
2968       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2969       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2970     // -Xconcgc
2971     } else if (match_option(option, "-Xconcgc", &tail)) {
2972       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2973     // -Xnoconcgc
2974     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2975       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2976     // -Xbatch
2977     } else if (match_option(option, "-Xbatch", &tail)) {
2978       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2979     // -Xmn for compatibility with other JVM vendors
2980     } else if (match_option(option, "-Xmn", &tail)) {
2981       julong long_initial_young_size = 0;
2982       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2983       if (errcode != arg_in_range) {
2984         jio_fprintf(defaultStream::error_stream(),
2985                     "Invalid initial young generation size: %s\n", option->optionString);
2986         describe_range_error(errcode);
2987         return JNI_EINVAL;
2988       }
2989       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2990       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2991     // -Xms
2992     } else if (match_option(option, "-Xms", &tail)) {
2993       julong long_initial_heap_size = 0;
2994       // an initial heap size of 0 means automatically determine
2995       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2996       if (errcode != arg_in_range) {
2997         jio_fprintf(defaultStream::error_stream(),
2998                     "Invalid initial heap size: %s\n", option->optionString);
2999         describe_range_error(errcode);
3000         return JNI_EINVAL;
3001       }
3002       set_min_heap_size((uintx)long_initial_heap_size);
3003       // Currently the minimum size and the initial heap sizes are the same.
3004       // Can be overridden with -XX:InitialHeapSize.
3005       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
3006     // -Xmx
3007     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3008       julong long_max_heap_size = 0;
3009       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3010       if (errcode != arg_in_range) {
3011         jio_fprintf(defaultStream::error_stream(),
3012                     "Invalid maximum heap size: %s\n", option->optionString);
3013         describe_range_error(errcode);
3014         return JNI_EINVAL;
3015       }
3016       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3017     // Xmaxf
3018     } else if (match_option(option, "-Xmaxf", &tail)) {
3019       char* err;
3020       int maxf = (int)(strtod(tail, &err) * 100);
3021       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3022         jio_fprintf(defaultStream::error_stream(),
3023                     "Bad max heap free percentage size: %s\n",
3024                     option->optionString);
3025         return JNI_EINVAL;
3026       } else {
3027         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3028       }
3029     // Xminf
3030     } else if (match_option(option, "-Xminf", &tail)) {
3031       char* err;
3032       int minf = (int)(strtod(tail, &err) * 100);
3033       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3034         jio_fprintf(defaultStream::error_stream(),
3035                     "Bad min heap free percentage size: %s\n",
3036                     option->optionString);
3037         return JNI_EINVAL;
3038       } else {
3039         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3040       }
3041     // -Xss
3042     } else if (match_option(option, "-Xss", &tail)) {
3043       julong long_ThreadStackSize = 0;
3044       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3045       if (errcode != arg_in_range) {
3046         jio_fprintf(defaultStream::error_stream(),
3047                     "Invalid thread stack size: %s\n", option->optionString);
3048         describe_range_error(errcode);
3049         return JNI_EINVAL;
3050       }
3051       // Internally track ThreadStackSize in units of 1024 bytes.
3052       FLAG_SET_CMDLINE(intx, ThreadStackSize,
3053                               round_to((int)long_ThreadStackSize, K) / K);
3054     // -Xoss
3055     } else if (match_option(option, "-Xoss", &tail)) {
3056           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3057     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3058       julong long_CodeCacheExpansionSize = 0;
3059       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3060       if (errcode != arg_in_range) {
3061         jio_fprintf(defaultStream::error_stream(),
3062                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3063                    os::vm_page_size()/K);
3064         return JNI_EINVAL;
3065       }
3066       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3067     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3068                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3069       julong long_ReservedCodeCacheSize = 0;
3070 
3071       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3072       if (errcode != arg_in_range) {
3073         jio_fprintf(defaultStream::error_stream(),
3074                     "Invalid maximum code cache size: %s.\n", option->optionString);
3075         return JNI_EINVAL;
3076       }
3077       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3078       //-XX:IncreaseFirstTierCompileThresholdAt=
3079       } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3080         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3081         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3082           jio_fprintf(defaultStream::error_stream(),
3083                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3084                       option->optionString);
3085           return JNI_EINVAL;
3086         }
3087         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3088     // -green
3089     } else if (match_option(option, "-green", &tail)) {
3090       jio_fprintf(defaultStream::error_stream(),
3091                   "Green threads support not available\n");
3092           return JNI_EINVAL;
3093     // -native
3094     } else if (match_option(option, "-native", &tail)) {
3095           // HotSpot always uses native threads, ignore silently for compatibility
3096     // -Xsqnopause
3097     } else if (match_option(option, "-Xsqnopause", &tail)) {
3098           // EVM option, ignore silently for compatibility
3099     // -Xrs
3100     } else if (match_option(option, "-Xrs", &tail)) {
3101           // Classic/EVM option, new functionality
3102       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3103     } else if (match_option(option, "-Xusealtsigs", &tail)) {
3104           // change default internal VM signals used - lower case for back compat
3105       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3106     // -Xoptimize
3107     } else if (match_option(option, "-Xoptimize", &tail)) {
3108           // EVM option, ignore silently for compatibility
3109     // -Xprof
3110     } else if (match_option(option, "-Xprof", &tail)) {
3111 #if INCLUDE_FPROF
3112       _has_profile = true;
3113 #else // INCLUDE_FPROF
3114       jio_fprintf(defaultStream::error_stream(),
3115         "Flat profiling is not supported in this VM.\n");
3116       return JNI_ERR;
3117 #endif // INCLUDE_FPROF
3118     // -Xconcurrentio
3119     } else if (match_option(option, "-Xconcurrentio", &tail)) {
3120       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3121       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3122       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3123       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3124       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
3125 
3126       // -Xinternalversion
3127     } else if (match_option(option, "-Xinternalversion", &tail)) {
3128       jio_fprintf(defaultStream::output_stream(), "%s\n",
3129                   VM_Version::internal_vm_info_string());
3130       vm_exit(0);
3131 #ifndef PRODUCT
3132     // -Xprintflags
3133     } else if (match_option(option, "-Xprintflags", &tail)) {
3134       CommandLineFlags::printFlags(tty, false);
3135       vm_exit(0);
3136 #endif
3137     // -D
3138     } else if (match_option(option, "-D", &tail)) {
3139       if (CheckEndorsedAndExtDirs) {
3140         if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3141           // abort if -Djava.endorsed.dirs is set
3142           jio_fprintf(defaultStream::output_stream(),
3143             "-Djava.endorsed.dirs will not be supported in a future release.\n"
3144             "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3145           return JNI_EINVAL;
3146         }
3147         if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3148           // abort if -Djava.ext.dirs is set
3149           jio_fprintf(defaultStream::output_stream(),
3150             "-Djava.ext.dirs will not be supported in a future release.\n"
3151             "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3152           return JNI_EINVAL;
3153         }
3154       }
3155 
3156       if (!add_property(tail)) {
3157         return JNI_ENOMEM;
3158       }
3159       // Out of the box management support
3160       if (match_option(option, "-Dcom.sun.management", &tail)) {
3161 #if INCLUDE_MANAGEMENT
3162         FLAG_SET_CMDLINE(bool, ManagementServer, true);
3163 #else
3164         jio_fprintf(defaultStream::output_stream(),
3165           "-Dcom.sun.management is not supported in this VM.\n");
3166         return JNI_ERR;
3167 #endif
3168       }
3169     // -Xint
3170     } else if (match_option(option, "-Xint", &tail)) {
3171           set_mode_flags(_int);
3172     // -Xmixed
3173     } else if (match_option(option, "-Xmixed", &tail)) {
3174           set_mode_flags(_mixed);
3175     // -Xcomp
3176     } else if (match_option(option, "-Xcomp", &tail)) {
3177       // for testing the compiler; turn off all flags that inhibit compilation
3178           set_mode_flags(_comp);
3179     // -Xshare:dump
3180     } else if (match_option(option, "-Xshare:dump", &tail)) {
3181       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3182       set_mode_flags(_int);     // Prevent compilation, which creates objects
3183     // -Xshare:on
3184     } else if (match_option(option, "-Xshare:on", &tail)) {
3185       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3186       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3187     // -Xshare:auto
3188     } else if (match_option(option, "-Xshare:auto", &tail)) {
3189       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3190       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3191     // -Xshare:off
3192     } else if (match_option(option, "-Xshare:off", &tail)) {
3193       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3194       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3195     // -Xverify
3196     } else if (match_option(option, "-Xverify", &tail)) {
3197       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3198         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3199         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3200       } else if (strcmp(tail, ":remote") == 0) {
3201         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3202         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3203       } else if (strcmp(tail, ":none") == 0) {
3204         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3205         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3206       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3207         return JNI_EINVAL;
3208       }
3209     // -Xdebug
3210     } else if (match_option(option, "-Xdebug", &tail)) {
3211       // note this flag has been used, then ignore
3212       set_xdebug_mode(true);
3213     // -Xnoagent
3214     } else if (match_option(option, "-Xnoagent", &tail)) {
3215       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3216     } else if (match_option(option, "-Xboundthreads", &tail)) {
3217       // Bind user level threads to kernel threads (Solaris only)
3218       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3219     } else if (match_option(option, "-Xloggc:", &tail)) {
3220       // Redirect GC output to the file. -Xloggc:<filename>
3221       // ostream_init_log(), when called will use this filename
3222       // to initialize a fileStream.
3223       _gc_log_filename = strdup(tail);
3224      if (!is_filename_valid(_gc_log_filename)) {
3225        jio_fprintf(defaultStream::output_stream(),
3226                   "Invalid file name for use with -Xloggc: Filename can only contain the "
3227                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3228                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
3229         return JNI_EINVAL;
3230       }
3231       FLAG_SET_CMDLINE(bool, PrintGC, true);
3232       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3233 
3234     // JNI hooks
3235     } else if (match_option(option, "-Xcheck", &tail)) {
3236       if (!strcmp(tail, ":jni")) {
3237 #if !INCLUDE_JNI_CHECK
3238         warning("JNI CHECKING is not supported in this VM");
3239 #else
3240         CheckJNICalls = true;
3241 #endif // INCLUDE_JNI_CHECK
3242       } else if (is_bad_option(option, args->ignoreUnrecognized,
3243                                      "check")) {
3244         return JNI_EINVAL;
3245       }
3246     } else if (match_option(option, "vfprintf", &tail)) {
3247       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3248     } else if (match_option(option, "exit", &tail)) {
3249       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3250     } else if (match_option(option, "abort", &tail)) {
3251       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3252     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3253       // The last option must always win.
3254       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3255       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3256     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3257       // The last option must always win.
3258       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3259       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3260     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3261                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3262       jio_fprintf(defaultStream::error_stream(),
3263         "Please use CMSClassUnloadingEnabled in place of "
3264         "CMSPermGenSweepingEnabled in the future\n");
3265     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3266       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3267       jio_fprintf(defaultStream::error_stream(),
3268         "Please use -XX:+UseGCOverheadLimit in place of "
3269         "-XX:+UseGCTimeLimit in the future\n");
3270     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3271       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3272       jio_fprintf(defaultStream::error_stream(),
3273         "Please use -XX:-UseGCOverheadLimit in place of "
3274         "-XX:-UseGCTimeLimit in the future\n");
3275     // The TLE options are for compatibility with 1.3 and will be
3276     // removed without notice in a future release.  These options
3277     // are not to be documented.
3278     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3279       // No longer used.
3280     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3281       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3282     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3283       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3284     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3285       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3286     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3287       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3288     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3289       // No longer used.
3290     } else if (match_option(option, "-XX:TLESize=", &tail)) {
3291       julong long_tlab_size = 0;
3292       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3293       if (errcode != arg_in_range) {
3294         jio_fprintf(defaultStream::error_stream(),
3295                     "Invalid TLAB size: %s\n", option->optionString);
3296         describe_range_error(errcode);
3297         return JNI_EINVAL;
3298       }
3299       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3300     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3301       // No longer used.
3302     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3303       FLAG_SET_CMDLINE(bool, UseTLAB, true);
3304     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3305       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3306     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3307       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3308       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3309     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3310       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3311       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3312     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3313 #if defined(DTRACE_ENABLED)
3314       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3315       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3316       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3317       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3318 #else // defined(DTRACE_ENABLED)
3319       jio_fprintf(defaultStream::error_stream(),
3320                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3321       return JNI_EINVAL;
3322 #endif // defined(DTRACE_ENABLED)
3323 #ifdef ASSERT
3324     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3325       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3326       // disable scavenge before parallel mark-compact
3327       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3328 #endif
3329     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3330       julong cms_blocks_to_claim = (julong)atol(tail);
3331       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3332       jio_fprintf(defaultStream::error_stream(),
3333         "Please use -XX:OldPLABSize in place of "
3334         "-XX:CMSParPromoteBlocksToClaim in the future\n");
3335     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3336       julong cms_blocks_to_claim = (julong)atol(tail);
3337       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3338       jio_fprintf(defaultStream::error_stream(),
3339         "Please use -XX:OldPLABSize in place of "
3340         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3341     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3342       julong old_plab_size = 0;
3343       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3344       if (errcode != arg_in_range) {
3345         jio_fprintf(defaultStream::error_stream(),
3346                     "Invalid old PLAB size: %s\n", option->optionString);
3347         describe_range_error(errcode);
3348         return JNI_EINVAL;
3349       }
3350       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3351       jio_fprintf(defaultStream::error_stream(),
3352                   "Please use -XX:OldPLABSize in place of "
3353                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3354     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3355       julong young_plab_size = 0;
3356       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3357       if (errcode != arg_in_range) {
3358         jio_fprintf(defaultStream::error_stream(),
3359                     "Invalid young PLAB size: %s\n", option->optionString);
3360         describe_range_error(errcode);
3361         return JNI_EINVAL;
3362       }
3363       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3364       jio_fprintf(defaultStream::error_stream(),
3365                   "Please use -XX:YoungPLABSize in place of "
3366                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3367     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3368                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3369       julong stack_size = 0;
3370       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3371       if (errcode != arg_in_range) {
3372         jio_fprintf(defaultStream::error_stream(),
3373                     "Invalid mark stack size: %s\n", option->optionString);
3374         describe_range_error(errcode);
3375         return JNI_EINVAL;
3376       }
3377       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3378     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3379       julong max_stack_size = 0;
3380       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3381       if (errcode != arg_in_range) {
3382         jio_fprintf(defaultStream::error_stream(),
3383                     "Invalid maximum mark stack size: %s\n",
3384                     option->optionString);
3385         describe_range_error(errcode);
3386         return JNI_EINVAL;
3387       }
3388       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3389     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3390                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3391       uintx conc_threads = 0;
3392       if (!parse_uintx(tail, &conc_threads, 1)) {
3393         jio_fprintf(defaultStream::error_stream(),
3394                     "Invalid concurrent threads: %s\n", option->optionString);
3395         return JNI_EINVAL;
3396       }
3397       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3398     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3399       julong max_direct_memory_size = 0;
3400       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3401       if (errcode != arg_in_range) {
3402         jio_fprintf(defaultStream::error_stream(),
3403                     "Invalid maximum direct memory size: %s\n",
3404                     option->optionString);
3405         describe_range_error(errcode);
3406         return JNI_EINVAL;
3407       }
3408       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3409     } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3410       // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3411       //       away and will cause VM initialization failures!
3412       warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3413       FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3414 #if !INCLUDE_MANAGEMENT
3415     } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3416         jio_fprintf(defaultStream::error_stream(),
3417           "ManagementServer is not supported in this VM.\n");
3418         return JNI_ERR;
3419 #endif // INCLUDE_MANAGEMENT
3420 #if INCLUDE_JFR
3421     } else if (match_jfr_option(&option)) {
3422       return JNI_EINVAL;
3423 #endif
3424     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3425       // Skip -XX:Flags= since that case has already been handled
3426       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3427         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3428           return JNI_EINVAL;
3429         }
3430       }
3431     // Unknown option
3432     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3433       return JNI_ERR;
3434     }
3435   }
3436 
3437   // PrintSharedArchiveAndExit will turn on
3438   //   -Xshare:on
3439   //   -XX:+TraceClassPaths
3440   if (PrintSharedArchiveAndExit) {
3441     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3442     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3443     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3444   }
3445 
3446   // Change the default value for flags  which have different default values
3447   // when working with older JDKs.
3448 #ifdef LINUX
3449  if (JDK_Version::current().compare_major(6) <= 0 &&
3450       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3451     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3452   }
3453 #endif // LINUX
3454   fix_appclasspath();
3455   return JNI_OK;
3456 }
3457 
3458 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3459 //
3460 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3461 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3462 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3463 // path is treated as the current directory.
3464 //
3465 // This causes problems with CDS, which requires that all directories specified in the classpath
3466 // must be empty. In most cases, applications do NOT want to load classes from the current
3467 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3468 // scripts compatible with CDS.
3469 void Arguments::fix_appclasspath() {
3470   if (IgnoreEmptyClassPaths) {
3471     const char separator = *os::path_separator();
3472     const char* src = _java_class_path->value();
3473 
3474     // skip over all the leading empty paths
3475     while (*src == separator) {
3476       src ++;
3477     }
3478 
3479     char* copy = os::strdup(src, mtInternal);
3480 
3481     // trim all trailing empty paths
3482     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3483       *tail = '\0';
3484     }
3485 
3486     char from[3] = {separator, separator, '\0'};
3487     char to  [2] = {separator, '\0'};
3488     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3489       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3490       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3491     }
3492 
3493     _java_class_path->set_value(copy);
3494     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3495   }
3496 
3497   if (!PrintSharedArchiveAndExit) {
3498     ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3499   }
3500 }
3501 
3502 static bool has_jar_files(const char* directory) {
3503   DIR* dir = os::opendir(directory);
3504   if (dir == NULL) return false;
3505 
3506   struct dirent *entry;
3507   bool hasJarFile = false;
3508   while (!hasJarFile && (entry = os::readdir(dir)) != NULL) {
3509     const char* name = entry->d_name;
3510     const char* ext = name + strlen(name) - 4;
3511     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3512   }
3513   os::closedir(dir);
3514   return hasJarFile ;
3515 }
3516 
3517 // returns the number of directories in the given path containing JAR files
3518 // If the skip argument is not NULL, it will skip that directory
3519 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3520   const char separator = *os::path_separator();
3521   const char* const end = path + strlen(path);
3522   int nonEmptyDirs = 0;
3523   while (path < end) {
3524     const char* tmp_end = strchr(path, separator);
3525     if (tmp_end == NULL) {
3526       if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3527         nonEmptyDirs++;
3528         jio_fprintf(defaultStream::output_stream(),
3529           "Non-empty %s directory: %s\n", type, path);
3530       }
3531       path = end;
3532     } else {
3533       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3534       memcpy(dirpath, path, tmp_end - path);
3535       dirpath[tmp_end - path] = '\0';
3536       if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3537         nonEmptyDirs++;
3538         jio_fprintf(defaultStream::output_stream(),
3539           "Non-empty %s directory: %s\n", type, dirpath);
3540       }
3541       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3542       path = tmp_end + 1;
3543     }
3544   }
3545   return nonEmptyDirs;
3546 }
3547 
3548 // Returns true if endorsed standards override mechanism and extension mechanism
3549 // are not used.
3550 static bool check_endorsed_and_ext_dirs() {
3551   if (!CheckEndorsedAndExtDirs)
3552     return true;
3553 
3554   char endorsedDir[JVM_MAXPATHLEN];
3555   char extDir[JVM_MAXPATHLEN];
3556   const char* fileSep = os::file_separator();
3557   jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3558                Arguments::get_java_home(), fileSep, fileSep);
3559   jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3560                Arguments::get_java_home(), fileSep, fileSep);
3561 
3562   // check endorsed directory
3563   int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3564 
3565   // check the extension directories but skip the default lib/ext directory
3566   nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3567 
3568   // List of JAR files installed in the default lib/ext directory.
3569   // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3570   static const char* jdk_ext_jars[] = {
3571       "access-bridge-32.jar",
3572       "access-bridge-64.jar",
3573       "access-bridge.jar",
3574       "cldrdata.jar",
3575       "dnsns.jar",
3576       "jaccess.jar",
3577       "jfxrt.jar",
3578       "localedata.jar",
3579       "nashorn.jar",
3580       "sunec.jar",
3581       "sunjce_provider.jar",
3582       "sunmscapi.jar",
3583       "sunpkcs11.jar",
3584       "ucrypto.jar",
3585       "zipfs.jar",
3586       NULL
3587   };
3588 
3589   // check if the default lib/ext directory has any non-JDK jar files; if so, error
3590   DIR* dir = os::opendir(extDir);
3591   if (dir != NULL) {
3592     int num_ext_jars = 0;
3593     struct dirent *entry;
3594     while ((entry = os::readdir(dir)) != NULL) {
3595       const char* name = entry->d_name;
3596       const char* ext = name + strlen(name) - 4;
3597       if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3598         bool is_jdk_jar = false;
3599         const char* jarfile = NULL;
3600         for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3601           if (os::file_name_strcmp(name, jarfile) == 0) {
3602             is_jdk_jar = true;
3603             break;
3604           }
3605         }
3606         if (!is_jdk_jar) {
3607           jio_fprintf(defaultStream::output_stream(),
3608             "%s installed in <JAVA_HOME>/lib/ext\n", name);
3609           num_ext_jars++;
3610         }
3611       }
3612     }
3613     os::closedir(dir);
3614     if (num_ext_jars > 0) {
3615       nonEmptyDirs += 1;
3616     }
3617   }
3618 
3619   // check if the default lib/endorsed directory exists; if so, error
3620   dir = os::opendir(endorsedDir);
3621   if (dir != NULL) {
3622     jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3623     os::closedir(dir);
3624     nonEmptyDirs += 1;
3625   }
3626 
3627   if (nonEmptyDirs > 0) {
3628     jio_fprintf(defaultStream::output_stream(),
3629       "Endorsed standards override mechanism and extension mechanism "
3630       "will not be supported in a future release.\n"
3631       "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3632     return false;
3633   }
3634 
3635   return true;
3636 }
3637 
3638 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3639   // This must be done after all -D arguments have been processed.
3640   scp_p->expand_endorsed();
3641 
3642   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3643     // Assemble the bootclasspath elements into the final path.
3644     Arguments::set_sysclasspath(scp_p->combined_path());
3645   }
3646 
3647   if (!check_endorsed_and_ext_dirs()) {
3648     return JNI_ERR;
3649   }
3650 
3651   // This must be done after all arguments have been processed
3652   // and the container support has been initialized since AggressiveHeap
3653   // relies on the amount of total memory available.
3654   if (AggressiveHeap) {
3655     jint result = set_aggressive_heap_flags();
3656     if (result != JNI_OK) {
3657       return result;
3658     }
3659   }
3660   // This must be done after all arguments have been processed.
3661   // java_compiler() true means set to "NONE" or empty.
3662   if (java_compiler() && !xdebug_mode()) {
3663     // For backwards compatibility, we switch to interpreted mode if
3664     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3665     // not specified.
3666     set_mode_flags(_int);
3667   }
3668   if (CompileThreshold == 0) {
3669     set_mode_flags(_int);
3670   }
3671 
3672   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3673   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3674     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3675   }
3676 
3677 #ifndef COMPILER2
3678   // Don't degrade server performance for footprint
3679   if (FLAG_IS_DEFAULT(UseLargePages) &&
3680       MaxHeapSize < LargePageHeapSizeThreshold) {
3681     // No need for large granularity pages w/small heaps.
3682     // Note that large pages are enabled/disabled for both the
3683     // Java heap and the code cache.
3684     FLAG_SET_DEFAULT(UseLargePages, false);
3685   }
3686 
3687 #else
3688   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3689     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3690   }
3691 #endif
3692 
3693 #ifndef TIERED
3694   // Tiered compilation is undefined.
3695   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3696 #endif
3697 
3698   // If we are running in a headless jre, force java.awt.headless property
3699   // to be true unless the property has already been set.
3700   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3701   if (os::is_headless_jre()) {
3702     const char* headless = Arguments::get_property("java.awt.headless");
3703     if (headless == NULL) {
3704       char envbuffer[128];
3705       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3706         if (!add_property("java.awt.headless=true")) {
3707           return JNI_ENOMEM;
3708         }
3709       } else {
3710         char buffer[256];
3711         jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3712         if (!add_property(buffer)) {
3713           return JNI_ENOMEM;
3714         }
3715       }
3716     }
3717   }
3718 
3719   if (!check_vm_args_consistency()) {
3720     return JNI_ERR;
3721   }
3722 
3723   return JNI_OK;
3724 }
3725 
3726 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3727   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3728                                             scp_assembly_required_p);
3729 }
3730 
3731 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3732   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3733                                             scp_assembly_required_p);
3734 }
3735 
3736 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3737   const int N_MAX_OPTIONS = 64;
3738   const int OPTION_BUFFER_SIZE = 1024;
3739   char buffer[OPTION_BUFFER_SIZE];
3740 
3741   // The variable will be ignored if it exceeds the length of the buffer.
3742   // Don't check this variable if user has special privileges
3743   // (e.g. unix su command).
3744   if (os::getenv(name, buffer, sizeof(buffer)) &&
3745       !os::have_special_privileges()) {
3746     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3747     jio_fprintf(defaultStream::error_stream(),
3748                 "Picked up %s: %s\n", name, buffer);
3749     char* rd = buffer;                        // pointer to the input string (rd)
3750     int i;
3751     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3752       while (isspace(*rd)) rd++;              // skip whitespace
3753       if (*rd == 0) break;                    // we re done when the input string is read completely
3754 
3755       // The output, option string, overwrites the input string.
3756       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3757       // input string (rd).
3758       char* wrt = rd;
3759 
3760       options[i++].optionString = wrt;        // Fill in option
3761       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3762         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3763           int quote = *rd;                    // matching quote to look for
3764           rd++;                               // don't copy open quote
3765           while (*rd != quote) {              // include everything (even spaces) up until quote
3766             if (*rd == 0) {                   // string termination means unmatched string
3767               jio_fprintf(defaultStream::error_stream(),
3768                           "Unmatched quote in %s\n", name);
3769               return JNI_ERR;
3770             }
3771             *wrt++ = *rd++;                   // copy to option string
3772           }
3773           rd++;                               // don't copy close quote
3774         } else {
3775           *wrt++ = *rd++;                     // copy to option string
3776         }
3777       }
3778       // Need to check if we're done before writing a NULL,
3779       // because the write could be to the byte that rd is pointing to.
3780       if (*rd++ == 0) {
3781         *wrt = 0;
3782         break;
3783       }
3784       *wrt = 0;                               // Zero terminate option
3785     }
3786     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3787     JavaVMInitArgs vm_args;
3788     vm_args.version = JNI_VERSION_1_2;
3789     vm_args.options = options;
3790     vm_args.nOptions = i;
3791     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3792 
3793     if (PrintVMOptions) {
3794       const char* tail;
3795       for (int i = 0; i < vm_args.nOptions; i++) {
3796         const JavaVMOption *option = vm_args.options + i;
3797         if (match_option(option, "-XX:", &tail)) {
3798           logOption(tail);
3799         }
3800       }
3801     }
3802 
3803     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3804   }
3805   return JNI_OK;
3806 }
3807 
3808 void Arguments::set_shared_spaces_flags() {
3809   if (DumpSharedSpaces) {
3810     if (FailOverToOldVerifier) {
3811       // Don't fall back to the old verifier on verification failure. If a
3812       // class fails verification with the split verifier, it might fail the
3813       // CDS runtime verifier constraint check. In that case, we don't want
3814       // to share the class. We only archive classes that pass the split verifier.
3815       FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3816     }
3817 
3818     if (RequireSharedSpaces) {
3819       warning("cannot dump shared archive while using shared archive");
3820     }
3821     UseSharedSpaces = false;
3822 #ifdef _LP64
3823     if (!UseCompressedOops || !UseCompressedClassPointers) {
3824       vm_exit_during_initialization(
3825         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3826     }
3827   } else {
3828     if (!UseCompressedOops || !UseCompressedClassPointers) {
3829       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3830     }
3831 #endif
3832   }
3833 }
3834 
3835 #if !INCLUDE_ALL_GCS
3836 static void force_serial_gc() {
3837   FLAG_SET_DEFAULT(UseSerialGC, true);
3838   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
3839   UNSUPPORTED_GC_OPTION(UseG1GC);
3840   UNSUPPORTED_GC_OPTION(UseParallelGC);
3841   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3842   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3843   UNSUPPORTED_GC_OPTION(UseParNewGC);
3844 }
3845 #endif // INCLUDE_ALL_GCS
3846 
3847 // Sharing support
3848 // Construct the path to the archive
3849 static char* get_shared_archive_path() {
3850   char *shared_archive_path;
3851   if (SharedArchiveFile == NULL) {
3852     char jvm_path[JVM_MAXPATHLEN];
3853     os::jvm_path(jvm_path, sizeof(jvm_path));
3854     char *end = strrchr(jvm_path, *os::file_separator());
3855     if (end != NULL) *end = '\0';
3856     size_t jvm_path_len = strlen(jvm_path);
3857     size_t file_sep_len = strlen(os::file_separator());
3858     const size_t len = jvm_path_len + file_sep_len + 20;
3859     shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3860     if (shared_archive_path != NULL) {
3861       jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3862         jvm_path, os::file_separator());
3863     }
3864   } else {
3865     shared_archive_path = os::strdup(SharedArchiveFile, mtInternal);
3866   }
3867   return shared_archive_path;
3868 }
3869 
3870 #ifndef PRODUCT
3871 // Determine whether LogVMOutput should be implicitly turned on.
3872 static bool use_vm_log() {
3873   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3874       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3875       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3876       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3877       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3878     return true;
3879   }
3880 
3881 #ifdef COMPILER1
3882   if (PrintC1Statistics) {
3883     return true;
3884   }
3885 #endif // COMPILER1
3886 
3887 #ifdef COMPILER2
3888   if (PrintOptoAssembly || PrintOptoStatistics) {
3889     return true;
3890   }
3891 #endif // COMPILER2
3892 
3893   return false;
3894 }
3895 #endif // PRODUCT
3896 
3897 // Parse entry point called from JNI_CreateJavaVM
3898 
3899 jint Arguments::parse(const JavaVMInitArgs* args) {
3900 
3901   // Remaining part of option string
3902   const char* tail;
3903 
3904   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3905   const char* hotspotrc = ".hotspotrc";
3906   bool settings_file_specified = false;
3907   bool needs_hotspotrc_warning = false;
3908 
3909   ArgumentsExt::process_options(args);
3910 
3911   const char* flags_file;
3912   int index;
3913   for (index = 0; index < args->nOptions; index++) {
3914     const JavaVMOption *option = args->options + index;
3915     if (match_option(option, "-XX:Flags=", &tail)) {
3916       flags_file = tail;
3917       settings_file_specified = true;
3918     }
3919     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3920       PrintVMOptions = true;
3921     }
3922     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3923       PrintVMOptions = false;
3924     }
3925     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3926       IgnoreUnrecognizedVMOptions = true;
3927     }
3928     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3929       IgnoreUnrecognizedVMOptions = false;
3930     }
3931     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3932       CommandLineFlags::printFlags(tty, false);
3933       vm_exit(0);
3934     }
3935     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3936 #if INCLUDE_NMT
3937       // The launcher did not setup nmt environment variable properly.
3938       if (!MemTracker::check_launcher_nmt_support(tail)) {
3939         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3940       }
3941 
3942       // Verify if nmt option is valid.
3943       if (MemTracker::verify_nmt_option()) {
3944         // Late initialization, still in single-threaded mode.
3945         if (MemTracker::tracking_level() >= NMT_summary) {
3946           MemTracker::init();
3947         }
3948       } else {
3949         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3950       }
3951 #else
3952       jio_fprintf(defaultStream::error_stream(),
3953         "Native Memory Tracking is not supported in this VM\n");
3954       return JNI_ERR;
3955 #endif
3956     }
3957 
3958 
3959 #ifndef PRODUCT
3960     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3961       CommandLineFlags::printFlags(tty, true);
3962       vm_exit(0);
3963     }
3964 #endif
3965   }
3966 
3967   if (IgnoreUnrecognizedVMOptions) {
3968     // uncast const to modify the flag args->ignoreUnrecognized
3969     *(jboolean*)(&args->ignoreUnrecognized) = true;
3970   }
3971 
3972   // Parse specified settings file
3973   if (settings_file_specified) {
3974     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3975       return JNI_EINVAL;
3976     }
3977   } else {
3978 #ifdef ASSERT
3979     // Parse default .hotspotrc settings file
3980     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3981       return JNI_EINVAL;
3982     }
3983 #else
3984     struct stat buf;
3985     if (os::stat(hotspotrc, &buf) == 0) {
3986       needs_hotspotrc_warning = true;
3987     }
3988 #endif
3989   }
3990 
3991   if (PrintVMOptions) {
3992     for (index = 0; index < args->nOptions; index++) {
3993       const JavaVMOption *option = args->options + index;
3994       if (match_option(option, "-XX:", &tail)) {
3995         logOption(tail);
3996       }
3997     }
3998   }
3999 
4000   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4001   jint result = parse_vm_init_args(args);
4002   if (result != JNI_OK) {
4003     return result;
4004   }
4005 
4006   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4007   SharedArchivePath = get_shared_archive_path();
4008   if (SharedArchivePath == NULL) {
4009     return JNI_ENOMEM;
4010   }
4011 
4012   // Set up VerifySharedSpaces
4013   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4014     VerifySharedSpaces = true;
4015   }
4016 
4017   // Delay warning until here so that we've had a chance to process
4018   // the -XX:-PrintWarnings flag
4019   if (needs_hotspotrc_warning) {
4020     warning("%s file is present but has been ignored.  "
4021             "Run with -XX:Flags=%s to load the file.",
4022             hotspotrc, hotspotrc);
4023   }
4024 
4025 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
4026   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4027 #endif
4028 
4029 #if INCLUDE_ALL_GCS
4030   #if (defined JAVASE_EMBEDDED || defined ARM)
4031     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4032   #endif
4033 #endif
4034 
4035 #ifndef PRODUCT
4036   if (TraceBytecodesAt != 0) {
4037     TraceBytecodes = true;
4038   }
4039   if (CountCompiledCalls) {
4040     if (UseCounterDecay) {
4041       warning("UseCounterDecay disabled because CountCalls is set");
4042       UseCounterDecay = false;
4043     }
4044   }
4045 #endif // PRODUCT
4046 
4047   // JSR 292 is not supported before 1.7
4048   if (!JDK_Version::is_gte_jdk17x_version()) {
4049     if (EnableInvokeDynamic) {
4050       if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4051         warning("JSR 292 is not supported before 1.7.  Disabling support.");
4052       }
4053       EnableInvokeDynamic = false;
4054     }
4055   }
4056 
4057   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4058     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4059       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4060     }
4061     ScavengeRootsInCode = 1;
4062   }
4063 
4064   if (PrintGCDetails) {
4065     // Turn on -verbose:gc options as well
4066     PrintGC = true;
4067   }
4068 
4069   if (!JDK_Version::is_gte_jdk18x_version()) {
4070     // To avoid changing the log format for 7 updates this flag is only
4071     // true by default in JDK8 and above.
4072     if (FLAG_IS_DEFAULT(PrintGCCause)) {
4073       FLAG_SET_DEFAULT(PrintGCCause, false);
4074     }
4075   }
4076 
4077   // Set object alignment values.
4078   set_object_alignment();
4079 
4080 #if !INCLUDE_ALL_GCS
4081   force_serial_gc();
4082 #endif // INCLUDE_ALL_GCS
4083 #if !INCLUDE_CDS
4084   if (DumpSharedSpaces || RequireSharedSpaces) {
4085     jio_fprintf(defaultStream::error_stream(),
4086       "Shared spaces are not supported in this VM\n");
4087     return JNI_ERR;
4088   }
4089   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4090     warning("Shared spaces are not supported in this VM");
4091     FLAG_SET_DEFAULT(UseSharedSpaces, false);
4092     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4093   }
4094   no_shared_spaces("CDS Disabled");
4095 #endif // INCLUDE_CDS
4096 
4097   return JNI_OK;
4098 }
4099 
4100 jint Arguments::apply_ergo() {
4101 
4102   // Set flags based on ergonomics.
4103   set_ergonomics_flags();
4104 
4105   set_shared_spaces_flags();
4106 
4107 #if defined(SPARC)
4108   // BIS instructions require 'membar' instruction regardless of the number
4109   // of CPUs because in virtualized/container environments which might use only 1
4110   // CPU, BIS instructions may produce incorrect results.
4111 
4112   if (FLAG_IS_DEFAULT(AssumeMP)) {
4113     FLAG_SET_DEFAULT(AssumeMP, true);
4114   }
4115 #endif
4116 
4117   // Check the GC selections again.
4118   if (!check_gc_consistency()) {
4119     return JNI_EINVAL;
4120   }
4121 
4122   if (TieredCompilation) {
4123     set_tiered_flags();
4124   } else {
4125     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4126     if (CompilationPolicyChoice >= 2) {
4127       vm_exit_during_initialization(
4128         "Incompatible compilation policy selected", NULL);
4129     }
4130   }
4131   // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4132   if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4133     FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4134   }
4135 
4136 
4137   // Set heap size based on available physical memory
4138   set_heap_size();
4139 
4140   ArgumentsExt::set_gc_specific_flags();
4141 
4142   // Initialize Metaspace flags and alignments.
4143   Metaspace::ergo_initialize();
4144 
4145   // Set bytecode rewriting flags
4146   set_bytecode_flags();
4147 
4148   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4149   set_aggressive_opts_flags();
4150 
4151   // Turn off biased locking for locking debug mode flags,
4152   // which are subtlely different from each other but neither works with
4153   // biased locking.
4154   if (UseHeavyMonitors
4155 #ifdef COMPILER1
4156       || !UseFastLocking
4157 #endif // COMPILER1
4158     ) {
4159     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4160       // flag set to true on command line; warn the user that they
4161       // can't enable biased locking here
4162       warning("Biased Locking is not supported with locking debug flags"
4163               "; ignoring UseBiasedLocking flag." );
4164     }
4165     UseBiasedLocking = false;
4166   }
4167 
4168 #ifdef ZERO
4169   // Clear flags not supported on zero.
4170   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4171   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4172   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4173   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4174 #endif // CC_INTERP
4175 
4176 #ifdef COMPILER2
4177   if (!EliminateLocks) {
4178     EliminateNestedLocks = false;
4179   }
4180   if (!Inline) {
4181     IncrementalInline = false;
4182   }
4183 #ifndef PRODUCT
4184   if (!IncrementalInline) {
4185     AlwaysIncrementalInline = false;
4186   }
4187 #endif
4188   if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4189     // incremental inlining: bump MaxNodeLimit
4190     FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4191   }
4192   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4193     // nothing to use the profiling, turn if off
4194     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4195   }
4196 #endif
4197 
4198   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4199     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4200     DebugNonSafepoints = true;
4201   }
4202 
4203   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4204     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4205   }
4206 
4207   if (UseOnStackReplacement && !UseLoopCounter) {
4208     warning("On-stack-replacement requires loop counters; enabling loop counters");
4209     FLAG_SET_DEFAULT(UseLoopCounter, true);
4210   }
4211 
4212 #ifndef PRODUCT
4213   if (CompileTheWorld) {
4214     // Force NmethodSweeper to sweep whole CodeCache each time.
4215     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4216       NmethodSweepFraction = 1;
4217     }
4218   }
4219 
4220   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4221     if (use_vm_log()) {
4222       LogVMOutput = true;
4223     }
4224   }
4225 #endif // PRODUCT
4226 
4227   if (PrintCommandLineFlags) {
4228     CommandLineFlags::printSetFlags(tty);
4229   }
4230 
4231   // Apply CPU specific policy for the BiasedLocking
4232   if (UseBiasedLocking) {
4233     if (!VM_Version::use_biased_locking() &&
4234         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4235       UseBiasedLocking = false;
4236     }
4237   }
4238 #ifdef COMPILER2
4239   if (!UseBiasedLocking || EmitSync != 0) {
4240     UseOptoBiasInlining = false;
4241   }
4242 #endif
4243 
4244   // set PauseAtExit if the gamma launcher was used and a debugger is attached
4245   // but only if not already set on the commandline
4246   if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4247     bool set = false;
4248     CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4249     if (!set) {
4250       FLAG_SET_DEFAULT(PauseAtExit, true);
4251     }
4252   }
4253 
4254   return JNI_OK;
4255 }
4256 
4257 jint Arguments::adjust_after_os() {
4258   if (UseNUMA) {
4259     if (UseParallelGC || UseParallelOldGC) {
4260       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4261          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4262       }
4263     }
4264     // UseNUMAInterleaving is set to ON for all collectors and
4265     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4266     // such as the parallel collector for Linux and Solaris will
4267     // interleave old gen and survivor spaces on top of NUMA
4268     // allocation policy for the eden space.
4269     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4270     // all platforms and ParallelGC on Windows will interleave all
4271     // of the heap spaces across NUMA nodes.
4272     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4273       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4274     }
4275   }
4276   return JNI_OK;
4277 }
4278 
4279 int Arguments::PropertyList_count(SystemProperty* pl) {
4280   int count = 0;
4281   while(pl != NULL) {
4282     count++;
4283     pl = pl->next();
4284   }
4285   return count;
4286 }
4287 
4288 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4289   assert(key != NULL, "just checking");
4290   SystemProperty* prop;
4291   for (prop = pl; prop != NULL; prop = prop->next()) {
4292     if (strcmp(key, prop->key()) == 0) return prop->value();
4293   }
4294   return NULL;
4295 }
4296 
4297 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4298   int count = 0;
4299   const char* ret_val = NULL;
4300 
4301   while(pl != NULL) {
4302     if(count >= index) {
4303       ret_val = pl->key();
4304       break;
4305     }
4306     count++;
4307     pl = pl->next();
4308   }
4309 
4310   return ret_val;
4311 }
4312 
4313 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4314   int count = 0;
4315   char* ret_val = NULL;
4316 
4317   while(pl != NULL) {
4318     if(count >= index) {
4319       ret_val = pl->value();
4320       break;
4321     }
4322     count++;
4323     pl = pl->next();
4324   }
4325 
4326   return ret_val;
4327 }
4328 
4329 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4330   SystemProperty* p = *plist;
4331   if (p == NULL) {
4332     *plist = new_p;
4333   } else {
4334     while (p->next() != NULL) {
4335       p = p->next();
4336     }
4337     p->set_next(new_p);
4338   }
4339 }
4340 
4341 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4342   if (plist == NULL)
4343     return;
4344 
4345   SystemProperty* new_p = new SystemProperty(k, v, true);
4346   PropertyList_add(plist, new_p);
4347 }
4348 
4349 // This add maintains unique property key in the list.
4350 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4351   if (plist == NULL)
4352     return;
4353 
4354   // If property key exist then update with new value.
4355   SystemProperty* prop;
4356   for (prop = *plist; prop != NULL; prop = prop->next()) {
4357     if (strcmp(k, prop->key()) == 0) {
4358       if (append) {
4359         prop->append_value(v);
4360       } else {
4361         prop->set_value(v);
4362       }
4363       return;
4364     }
4365   }
4366 
4367   PropertyList_add(plist, k, v);
4368 }
4369 
4370 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4371 // Returns true if all of the source pointed by src has been copied over to
4372 // the destination buffer pointed by buf. Otherwise, returns false.
4373 // Notes:
4374 // 1. If the length (buflen) of the destination buffer excluding the
4375 // NULL terminator character is not long enough for holding the expanded
4376 // pid characters, it also returns false instead of returning the partially
4377 // expanded one.
4378 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4379 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4380                                 char* buf, size_t buflen) {
4381   const char* p = src;
4382   char* b = buf;
4383   const char* src_end = &src[srclen];
4384   char* buf_end = &buf[buflen - 1];
4385 
4386   while (p < src_end && b < buf_end) {
4387     if (*p == '%') {
4388       switch (*(++p)) {
4389       case '%':         // "%%" ==> "%"
4390         *b++ = *p++;
4391         break;
4392       case 'p':  {       //  "%p" ==> current process id
4393         // buf_end points to the character before the last character so
4394         // that we could write '\0' to the end of the buffer.
4395         size_t buf_sz = buf_end - b + 1;
4396         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4397 
4398         // if jio_snprintf fails or the buffer is not long enough to hold
4399         // the expanded pid, returns false.
4400         if (ret < 0 || ret >= (int)buf_sz) {
4401           return false;
4402         } else {
4403           b += ret;
4404           assert(*b == '\0', "fail in copy_expand_pid");
4405           if (p == src_end && b == buf_end + 1) {
4406             // reach the end of the buffer.
4407             return true;
4408           }
4409         }
4410         p++;
4411         break;
4412       }
4413       default :
4414         *b++ = '%';
4415       }
4416     } else {
4417       *b++ = *p++;
4418     }
4419   }
4420   *b = '\0';
4421   return (p == src_end); // return false if not all of the source was copied
4422 }