1 /*
   2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classLoader.hpp"
  27 #include "classfile/javaAssertions.hpp"
  28 #include "classfile/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 #ifdef TARGET_OS_FAMILY_linux
  48 # include "os_linux.inline.hpp"
  49 #endif
  50 #ifdef TARGET_OS_FAMILY_solaris
  51 # include "os_solaris.inline.hpp"
  52 #endif
  53 #ifdef TARGET_OS_FAMILY_windows
  54 # include "os_windows.inline.hpp"
  55 #endif
  56 #ifdef TARGET_OS_FAMILY_aix
  57 # include "os_aix.inline.hpp"
  58 #endif
  59 #ifdef TARGET_OS_FAMILY_bsd
  60 # include "os_bsd.inline.hpp"
  61 #endif
  62 #if INCLUDE_ALL_GCS
  63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  66 #endif // INCLUDE_ALL_GCS
  67 
  68 // Note: This is a special bug reporting site for the JVM
  69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  70 #define DEFAULT_JAVA_LAUNCHER  "generic"
  71 
  72 // Disable options not supported in this release, with a warning if they
  73 // were explicitly requested on the command-line
  74 #define UNSUPPORTED_OPTION(opt, description)                    \
  75 do {                                                            \
  76   if (opt) {                                                    \
  77     if (FLAG_IS_CMDLINE(opt)) {                                 \
  78       warning(description " is disabled in this release.");     \
  79     }                                                           \
  80     FLAG_SET_DEFAULT(opt, false);                               \
  81   }                                                             \
  82 } while(0)
  83 
  84 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  85 do {                                                                  \
  86   if (gc) {                                                           \
  87     if (FLAG_IS_CMDLINE(gc)) {                                        \
  88       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  89     }                                                                 \
  90     FLAG_SET_DEFAULT(gc, false);                                      \
  91   }                                                                   \
  92 } while(0)
  93 
  94 char**  Arguments::_jvm_flags_array             = NULL;
  95 int     Arguments::_num_jvm_flags               = 0;
  96 char**  Arguments::_jvm_args_array              = NULL;
  97 int     Arguments::_num_jvm_args                = 0;
  98 char*  Arguments::_java_command                 = NULL;
  99 SystemProperty* Arguments::_system_properties   = NULL;
 100 const char*  Arguments::_gc_log_filename        = NULL;
 101 bool   Arguments::_has_profile                  = false;
 102 size_t Arguments::_conservative_max_heap_alignment = 0;
 103 uintx  Arguments::_min_heap_size                = 0;
 104 uintx  Arguments::_min_heap_free_ratio          = 0;
 105 uintx  Arguments::_max_heap_free_ratio          = 0;
 106 Arguments::Mode Arguments::_mode                = _mixed;
 107 bool   Arguments::_java_compiler                = false;
 108 bool   Arguments::_xdebug_mode                  = false;
 109 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
 110 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
 111 int    Arguments::_sun_java_launcher_pid        = -1;
 112 bool   Arguments::_created_by_gamma_launcher    = false;
 113 
 114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
 115 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 116 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 117 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 118 bool   Arguments::_ClipInlining                 = ClipInlining;
 119 
 120 char*  Arguments::SharedArchivePath             = NULL;
 121 
 122 AgentLibraryList Arguments::_libraryList;
 123 AgentLibraryList Arguments::_agentList;
 124 
 125 abort_hook_t     Arguments::_abort_hook         = NULL;
 126 exit_hook_t      Arguments::_exit_hook          = NULL;
 127 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 128 
 129 
 130 SystemProperty *Arguments::_java_ext_dirs = NULL;
 131 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
 132 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 133 SystemProperty *Arguments::_java_library_path = NULL;
 134 SystemProperty *Arguments::_java_home = NULL;
 135 SystemProperty *Arguments::_java_class_path = NULL;
 136 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 137 
 138 char* Arguments::_meta_index_path = NULL;
 139 char* Arguments::_meta_index_dir = NULL;
 140 
 141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
 142 
 143 static bool match_option(const JavaVMOption *option, const char* name,
 144                          const char** tail) {
 145   int len = (int)strlen(name);
 146   if (strncmp(option->optionString, name, len) == 0) {
 147     *tail = option->optionString + len;
 148     return true;
 149   } else {
 150     return false;
 151   }
 152 }
 153 
 154 static void logOption(const char* opt) {
 155   if (PrintVMOptions) {
 156     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 157   }
 158 }
 159 
 160 // Process java launcher properties.
 161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 162   // See if sun.java.launcher or sun.java.launcher.pid is defined.
 163   // Must do this before setting up other system properties,
 164   // as some of them may depend on launcher type.
 165   for (int index = 0; index < args->nOptions; index++) {
 166     const JavaVMOption* option = args->options + index;
 167     const char* tail;
 168 
 169     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 170       process_java_launcher_argument(tail, option->extraInfo);
 171       continue;
 172     }
 173     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 174       _sun_java_launcher_pid = atoi(tail);
 175       continue;
 176     }
 177   }
 178 }
 179 
 180 // Initialize system properties key and value.
 181 void Arguments::init_system_properties() {
 182 
 183   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 184                                                                  "Java Virtual Machine Specification",  false));
 185   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 186   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 187   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 188 
 189   // following are JVMTI agent writeable properties.
 190   // Properties values are set to NULL and they are
 191   // os specific they are initialized in os::init_system_properties_values().
 192   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 193   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 194   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 195   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 196   _java_home =  new SystemProperty("java.home", NULL,  true);
 197   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 198 
 199   _java_class_path = new SystemProperty("java.class.path", "",  true);
 200 
 201   // Add to System Property list.
 202   PropertyList_add(&_system_properties, _java_ext_dirs);
 203   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 204   PropertyList_add(&_system_properties, _sun_boot_library_path);
 205   PropertyList_add(&_system_properties, _java_library_path);
 206   PropertyList_add(&_system_properties, _java_home);
 207   PropertyList_add(&_system_properties, _java_class_path);
 208   PropertyList_add(&_system_properties, _sun_boot_class_path);
 209 
 210   // Set OS specific system properties values
 211   os::init_system_properties_values();
 212 }
 213 
 214 
 215   // Update/Initialize System properties after JDK version number is known
 216 void Arguments::init_version_specific_system_properties() {
 217   enum { bufsz = 16 };
 218   char buffer[bufsz];
 219   const char* spec_vendor = "Sun Microsystems Inc.";
 220   uint32_t spec_version = 0;
 221 
 222   if (JDK_Version::is_gte_jdk17x_version()) {
 223     spec_vendor = "Oracle Corporation";
 224     spec_version = JDK_Version::current().major_version();
 225   }
 226   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 227 
 228   PropertyList_add(&_system_properties,
 229       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 230   PropertyList_add(&_system_properties,
 231       new SystemProperty("java.vm.specification.version", buffer, false));
 232   PropertyList_add(&_system_properties,
 233       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 234 }
 235 
 236 /**
 237  * Provide a slightly more user-friendly way of eliminating -XX flags.
 238  * When a flag is eliminated, it can be added to this list in order to
 239  * continue accepting this flag on the command-line, while issuing a warning
 240  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 241  * limit, we flatly refuse to admit the existence of the flag.  This allows
 242  * a flag to die correctly over JDK releases using HSX.
 243  */
 244 typedef struct {
 245   const char* name;
 246   JDK_Version obsoleted_in; // when the flag went away
 247   JDK_Version accept_until; // which version to start denying the existence
 248 } ObsoleteFlag;
 249 
 250 static ObsoleteFlag obsolete_jvm_flags[] = {
 251   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 252   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 253   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 254   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 255   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 256   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 257   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 258   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 259   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 260   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 261   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 262   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 263   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 264   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 265   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 266   { "DefaultInitialRAMFraction",
 267                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 268   { "UseDepthFirstScavengeOrder",
 269                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 270   { "HandlePromotionFailure",
 271                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 272   { "MaxLiveObjectEvacuationRatio",
 273                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 274   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 275   { "UseParallelOldGCCompacting",
 276                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 277   { "UseParallelDensePrefixUpdate",
 278                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 279   { "UseParallelOldGCDensePrefix",
 280                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 281   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 282   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 283   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 284   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 285   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 286   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 287   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 288   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 289   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 290   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 291   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 292   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 293   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 294   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 295   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 296   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 297   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 298   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 299   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 300   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 301   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 302   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 303   { "CompilationRepeat",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 304 #ifdef PRODUCT
 305   { "DesiredMethodLimit",
 306                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 307 #endif // PRODUCT
 308   { NULL, JDK_Version(0), JDK_Version(0) }
 309 };
 310 
 311 // Returns true if the flag is obsolete and fits into the range specified
 312 // for being ignored.  In the case that the flag is ignored, the 'version'
 313 // value is filled in with the version number when the flag became
 314 // obsolete so that that value can be displayed to the user.
 315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 316   int i = 0;
 317   assert(version != NULL, "Must provide a version buffer");
 318   while (obsolete_jvm_flags[i].name != NULL) {
 319     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 320     // <flag>=xxx form
 321     // [-|+]<flag> form
 322     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 323         ((s[0] == '+' || s[0] == '-') &&
 324         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 325       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 326           *version = flag_status.obsoleted_in;
 327           return true;
 328       }
 329     }
 330     i++;
 331   }
 332   return false;
 333 }
 334 
 335 // Constructs the system class path (aka boot class path) from the following
 336 // components, in order:
 337 //
 338 //     prefix           // from -Xbootclasspath/p:...
 339 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 340 //     base             // from os::get_system_properties() or -Xbootclasspath=
 341 //     suffix           // from -Xbootclasspath/a:...
 342 //
 343 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 344 // directories are added to the sysclasspath just before the base.
 345 //
 346 // This could be AllStatic, but it isn't needed after argument processing is
 347 // complete.
 348 class SysClassPath: public StackObj {
 349 public:
 350   SysClassPath(const char* base);
 351   ~SysClassPath();
 352 
 353   inline void set_base(const char* base);
 354   inline void add_prefix(const char* prefix);
 355   inline void add_suffix_to_prefix(const char* suffix);
 356   inline void add_suffix(const char* suffix);
 357   inline void reset_path(const char* base);
 358 
 359   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 360   // property.  Must be called after all command-line arguments have been
 361   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 362   // combined_path().
 363   void expand_endorsed();
 364 
 365   inline const char* get_base()     const { return _items[_scp_base]; }
 366   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 367   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 368   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 369 
 370   // Combine all the components into a single c-heap-allocated string; caller
 371   // must free the string if/when no longer needed.
 372   char* combined_path();
 373 
 374 private:
 375   // Utility routines.
 376   static char* add_to_path(const char* path, const char* str, bool prepend);
 377   static char* add_jars_to_path(char* path, const char* directory);
 378 
 379   inline void reset_item_at(int index);
 380 
 381   // Array indices for the items that make up the sysclasspath.  All except the
 382   // base are allocated in the C heap and freed by this class.
 383   enum {
 384     _scp_prefix,        // from -Xbootclasspath/p:...
 385     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 386     _scp_base,          // the default sysclasspath
 387     _scp_suffix,        // from -Xbootclasspath/a:...
 388     _scp_nitems         // the number of items, must be last.
 389   };
 390 
 391   const char* _items[_scp_nitems];
 392   DEBUG_ONLY(bool _expansion_done;)
 393 };
 394 
 395 SysClassPath::SysClassPath(const char* base) {
 396   memset(_items, 0, sizeof(_items));
 397   _items[_scp_base] = base;
 398   DEBUG_ONLY(_expansion_done = false;)
 399 }
 400 
 401 SysClassPath::~SysClassPath() {
 402   // Free everything except the base.
 403   for (int i = 0; i < _scp_nitems; ++i) {
 404     if (i != _scp_base) reset_item_at(i);
 405   }
 406   DEBUG_ONLY(_expansion_done = false;)
 407 }
 408 
 409 inline void SysClassPath::set_base(const char* base) {
 410   _items[_scp_base] = base;
 411 }
 412 
 413 inline void SysClassPath::add_prefix(const char* prefix) {
 414   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 415 }
 416 
 417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 418   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 419 }
 420 
 421 inline void SysClassPath::add_suffix(const char* suffix) {
 422   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 423 }
 424 
 425 inline void SysClassPath::reset_item_at(int index) {
 426   assert(index < _scp_nitems && index != _scp_base, "just checking");
 427   if (_items[index] != NULL) {
 428     FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
 429     _items[index] = NULL;
 430   }
 431 }
 432 
 433 inline void SysClassPath::reset_path(const char* base) {
 434   // Clear the prefix and suffix.
 435   reset_item_at(_scp_prefix);
 436   reset_item_at(_scp_suffix);
 437   set_base(base);
 438 }
 439 
 440 //------------------------------------------------------------------------------
 441 
 442 void SysClassPath::expand_endorsed() {
 443   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 444 
 445   const char* path = Arguments::get_property("java.endorsed.dirs");
 446   if (path == NULL) {
 447     path = Arguments::get_endorsed_dir();
 448     assert(path != NULL, "no default for java.endorsed.dirs");
 449   }
 450 
 451   char* expanded_path = NULL;
 452   const char separator = *os::path_separator();
 453   const char* const end = path + strlen(path);
 454   while (path < end) {
 455     const char* tmp_end = strchr(path, separator);
 456     if (tmp_end == NULL) {
 457       expanded_path = add_jars_to_path(expanded_path, path);
 458       path = end;
 459     } else {
 460       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
 461       memcpy(dirpath, path, tmp_end - path);
 462       dirpath[tmp_end - path] = '\0';
 463       expanded_path = add_jars_to_path(expanded_path, dirpath);
 464       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
 465       path = tmp_end + 1;
 466     }
 467   }
 468   _items[_scp_endorsed] = expanded_path;
 469   DEBUG_ONLY(_expansion_done = true;)
 470 }
 471 
 472 // Combine the bootclasspath elements, some of which may be null, into a single
 473 // c-heap-allocated string.
 474 char* SysClassPath::combined_path() {
 475   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 476   assert(_expansion_done, "must call expand_endorsed() first.");
 477 
 478   size_t lengths[_scp_nitems];
 479   size_t total_len = 0;
 480 
 481   const char separator = *os::path_separator();
 482 
 483   // Get the lengths.
 484   int i;
 485   for (i = 0; i < _scp_nitems; ++i) {
 486     if (_items[i] != NULL) {
 487       lengths[i] = strlen(_items[i]);
 488       // Include space for the separator char (or a NULL for the last item).
 489       total_len += lengths[i] + 1;
 490     }
 491   }
 492   assert(total_len > 0, "empty sysclasspath not allowed");
 493 
 494   // Copy the _items to a single string.
 495   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 496   char* cp_tmp = cp;
 497   for (i = 0; i < _scp_nitems; ++i) {
 498     if (_items[i] != NULL) {
 499       memcpy(cp_tmp, _items[i], lengths[i]);
 500       cp_tmp += lengths[i];
 501       *cp_tmp++ = separator;
 502     }
 503   }
 504   *--cp_tmp = '\0';     // Replace the extra separator.
 505   return cp;
 506 }
 507 
 508 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 509 char*
 510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 511   char *cp;
 512 
 513   assert(str != NULL, "just checking");
 514   if (path == NULL) {
 515     size_t len = strlen(str) + 1;
 516     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 517     memcpy(cp, str, len);                       // copy the trailing null
 518   } else {
 519     const char separator = *os::path_separator();
 520     size_t old_len = strlen(path);
 521     size_t str_len = strlen(str);
 522     size_t len = old_len + str_len + 2;
 523 
 524     if (prepend) {
 525       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 526       char* cp_tmp = cp;
 527       memcpy(cp_tmp, str, str_len);
 528       cp_tmp += str_len;
 529       *cp_tmp = separator;
 530       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 531       FREE_C_HEAP_ARRAY(char, path, mtInternal);
 532     } else {
 533       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 534       char* cp_tmp = cp + old_len;
 535       *cp_tmp = separator;
 536       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 537     }
 538   }
 539   return cp;
 540 }
 541 
 542 // Scan the directory and append any jar or zip files found to path.
 543 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 545   DIR* dir = os::opendir(directory);
 546   if (dir == NULL) return path;
 547 
 548   char dir_sep[2] = { '\0', '\0' };
 549   size_t directory_len = strlen(directory);
 550   const char fileSep = *os::file_separator();
 551   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 552 
 553   /* Scan the directory for jars/zips, appending them to path. */
 554   struct dirent *entry;
 555   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 556   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 557     const char* name = entry->d_name;
 558     const char* ext = name + strlen(name) - 4;
 559     bool isJarOrZip = ext > name &&
 560       (os::file_name_strcmp(ext, ".jar") == 0 ||
 561        os::file_name_strcmp(ext, ".zip") == 0);
 562     if (isJarOrZip) {
 563       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 564       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 565       path = add_to_path(path, jarpath, false);
 566       FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
 567     }
 568   }
 569   FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
 570   os::closedir(dir);
 571   return path;
 572 }
 573 
 574 // Parses a memory size specification string.
 575 static bool atomull(const char *s, julong* result) {
 576   julong n = 0;
 577   int args_read = sscanf(s, JULONG_FORMAT, &n);
 578   if (args_read != 1) {
 579     return false;
 580   }
 581   while (*s != '\0' && isdigit(*s)) {
 582     s++;
 583   }
 584   // 4705540: illegal if more characters are found after the first non-digit
 585   if (strlen(s) > 1) {
 586     return false;
 587   }
 588   switch (*s) {
 589     case 'T': case 't':
 590       *result = n * G * K;
 591       // Check for overflow.
 592       if (*result/((julong)G * K) != n) return false;
 593       return true;
 594     case 'G': case 'g':
 595       *result = n * G;
 596       if (*result/G != n) return false;
 597       return true;
 598     case 'M': case 'm':
 599       *result = n * M;
 600       if (*result/M != n) return false;
 601       return true;
 602     case 'K': case 'k':
 603       *result = n * K;
 604       if (*result/K != n) return false;
 605       return true;
 606     case '\0':
 607       *result = n;
 608       return true;
 609     default:
 610       return false;
 611   }
 612 }
 613 
 614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 615   if (size < min_size) return arg_too_small;
 616   // Check that size will fit in a size_t (only relevant on 32-bit)
 617   if (size > max_uintx) return arg_too_big;
 618   return arg_in_range;
 619 }
 620 
 621 // Describe an argument out of range error
 622 void Arguments::describe_range_error(ArgsRange errcode) {
 623   switch(errcode) {
 624   case arg_too_big:
 625     jio_fprintf(defaultStream::error_stream(),
 626                 "The specified size exceeds the maximum "
 627                 "representable size.\n");
 628     break;
 629   case arg_too_small:
 630   case arg_unreadable:
 631   case arg_in_range:
 632     // do nothing for now
 633     break;
 634   default:
 635     ShouldNotReachHere();
 636   }
 637 }
 638 
 639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 640   return CommandLineFlags::boolAtPut(name, &value, origin);
 641 }
 642 
 643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 644   double v;
 645   if (sscanf(value, "%lf", &v) != 1) {
 646     return false;
 647   }
 648 
 649   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 650     return true;
 651   }
 652   return false;
 653 }
 654 
 655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 656   julong v;
 657   intx intx_v;
 658   bool is_neg = false;
 659   // Check the sign first since atomull() parses only unsigned values.
 660   if (*value == '-') {
 661     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 662       return false;
 663     }
 664     value++;
 665     is_neg = true;
 666   }
 667   if (!atomull(value, &v)) {
 668     return false;
 669   }
 670   intx_v = (intx) v;
 671   if (is_neg) {
 672     intx_v = -intx_v;
 673   }
 674   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 675     return true;
 676   }
 677   uintx uintx_v = (uintx) v;
 678   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 679     return true;
 680   }
 681   uint64_t uint64_t_v = (uint64_t) v;
 682   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 683     return true;
 684   }
 685   return false;
 686 }
 687 
 688 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 689   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 690   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 691   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 692   return true;
 693 }
 694 
 695 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 696   const char* old_value = "";
 697   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 698   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 699   size_t new_len = strlen(new_value);
 700   const char* value;
 701   char* free_this_too = NULL;
 702   if (old_len == 0) {
 703     value = new_value;
 704   } else if (new_len == 0) {
 705     value = old_value;
 706   } else {
 707     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 708     // each new setting adds another LINE to the switch:
 709     sprintf(buf, "%s\n%s", old_value, new_value);
 710     value = buf;
 711     free_this_too = buf;
 712   }
 713   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 714   // CommandLineFlags always returns a pointer that needs freeing.
 715   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 716   if (free_this_too != NULL) {
 717     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 718     FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
 719   }
 720   return true;
 721 }
 722 
 723 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 724 
 725   // range of acceptable characters spelled out for portability reasons
 726 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 727 #define BUFLEN 255
 728   char name[BUFLEN+1];
 729   char dummy;
 730 
 731   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 732     return set_bool_flag(name, false, origin);
 733   }
 734   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 735     return set_bool_flag(name, true, origin);
 736   }
 737 
 738   char punct;
 739   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 740     const char* value = strchr(arg, '=') + 1;
 741     Flag* flag = Flag::find_flag(name, strlen(name));
 742     if (flag != NULL && flag->is_ccstr()) {
 743       if (flag->ccstr_accumulates()) {
 744         return append_to_string_flag(name, value, origin);
 745       } else {
 746         if (value[0] == '\0') {
 747           value = NULL;
 748         }
 749         return set_string_flag(name, value, origin);
 750       }
 751     }
 752   }
 753 
 754   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 755     const char* value = strchr(arg, '=') + 1;
 756     // -XX:Foo:=xxx will reset the string flag to the given value.
 757     if (value[0] == '\0') {
 758       value = NULL;
 759     }
 760     return set_string_flag(name, value, origin);
 761   }
 762 
 763 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 764 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 765 #define        NUMBER_RANGE    "[0123456789]"
 766   char value[BUFLEN + 1];
 767   char value2[BUFLEN + 1];
 768   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 769     // Looks like a floating-point number -- try again with more lenient format string
 770     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 771       return set_fp_numeric_flag(name, value, origin);
 772     }
 773   }
 774 
 775 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 776   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 777     return set_numeric_flag(name, value, origin);
 778   }
 779 
 780   return false;
 781 }
 782 
 783 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 784   assert(bldarray != NULL, "illegal argument");
 785 
 786   if (arg == NULL) {
 787     return;
 788   }
 789 
 790   int new_count = *count + 1;
 791 
 792   // expand the array and add arg to the last element
 793   if (*bldarray == NULL) {
 794     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 795   } else {
 796     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 797   }
 798   (*bldarray)[*count] = strdup(arg);
 799   *count = new_count;
 800 }
 801 
 802 void Arguments::build_jvm_args(const char* arg) {
 803   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 804 }
 805 
 806 void Arguments::build_jvm_flags(const char* arg) {
 807   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 808 }
 809 
 810 // utility function to return a string that concatenates all
 811 // strings in a given char** array
 812 const char* Arguments::build_resource_string(char** args, int count) {
 813   if (args == NULL || count == 0) {
 814     return NULL;
 815   }
 816   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 817   for (int i = 1; i < count; i++) {
 818     length += strlen(args[i]) + 1; // add 1 for a space
 819   }
 820   char* s = NEW_RESOURCE_ARRAY(char, length);
 821   strcpy(s, args[0]);
 822   for (int j = 1; j < count; j++) {
 823     strcat(s, " ");
 824     strcat(s, args[j]);
 825   }
 826   return (const char*) s;
 827 }
 828 
 829 void Arguments::print_on(outputStream* st) {
 830   st->print_cr("VM Arguments:");
 831   if (num_jvm_flags() > 0) {
 832     st->print("jvm_flags: "); print_jvm_flags_on(st);
 833   }
 834   if (num_jvm_args() > 0) {
 835     st->print("jvm_args: "); print_jvm_args_on(st);
 836   }
 837   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 838   if (_java_class_path != NULL) {
 839     char* path = _java_class_path->value();
 840     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 841   }
 842   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 843 }
 844 
 845 void Arguments::print_jvm_flags_on(outputStream* st) {
 846   if (_num_jvm_flags > 0) {
 847     for (int i=0; i < _num_jvm_flags; i++) {
 848       st->print("%s ", _jvm_flags_array[i]);
 849     }
 850     st->cr();
 851   }
 852 }
 853 
 854 void Arguments::print_jvm_args_on(outputStream* st) {
 855   if (_num_jvm_args > 0) {
 856     for (int i=0; i < _num_jvm_args; i++) {
 857       st->print("%s ", _jvm_args_array[i]);
 858     }
 859     st->cr();
 860   }
 861 }
 862 
 863 bool Arguments::process_argument(const char* arg,
 864     jboolean ignore_unrecognized, Flag::Flags origin) {
 865 
 866   JDK_Version since = JDK_Version();
 867 
 868   if (parse_argument(arg, origin) || ignore_unrecognized) {
 869     return true;
 870   }
 871 
 872   bool has_plus_minus = (*arg == '+' || *arg == '-');
 873   const char* const argname = has_plus_minus ? arg + 1 : arg;
 874   if (is_newly_obsolete(arg, &since)) {
 875     char version[256];
 876     since.to_string(version, sizeof(version));
 877     warning("ignoring option %s; support was removed in %s", argname, version);
 878     return true;
 879   }
 880 
 881   // For locked flags, report a custom error message if available.
 882   // Otherwise, report the standard unrecognized VM option.
 883 
 884   size_t arg_len;
 885   const char* equal_sign = strchr(argname, '=');
 886   if (equal_sign == NULL) {
 887     arg_len = strlen(argname);
 888   } else {
 889     arg_len = equal_sign - argname;
 890   }
 891 
 892   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 893   if (found_flag != NULL) {
 894     char locked_message_buf[BUFLEN];
 895     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 896     if (strlen(locked_message_buf) == 0) {
 897       if (found_flag->is_bool() && !has_plus_minus) {
 898         jio_fprintf(defaultStream::error_stream(),
 899           "Missing +/- setting for VM option '%s'\n", argname);
 900       } else if (!found_flag->is_bool() && has_plus_minus) {
 901         jio_fprintf(defaultStream::error_stream(),
 902           "Unexpected +/- setting in VM option '%s'\n", argname);
 903       } else {
 904         jio_fprintf(defaultStream::error_stream(),
 905           "Improperly specified VM option '%s'\n", argname);
 906       }
 907     } else {
 908       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 909     }
 910   } else {
 911     jio_fprintf(defaultStream::error_stream(),
 912                 "Unrecognized VM option '%s'\n", argname);
 913     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 914     if (fuzzy_matched != NULL) {
 915       jio_fprintf(defaultStream::error_stream(),
 916                   "Did you mean '%s%s%s'?\n",
 917                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 918                   fuzzy_matched->_name,
 919                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 920     }
 921   }
 922 
 923   // allow for commandline "commenting out" options like -XX:#+Verbose
 924   return arg[0] == '#';
 925 }
 926 
 927 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 928   FILE* stream = fopen(file_name, "rb");
 929   if (stream == NULL) {
 930     if (should_exist) {
 931       jio_fprintf(defaultStream::error_stream(),
 932                   "Could not open settings file %s\n", file_name);
 933       return false;
 934     } else {
 935       return true;
 936     }
 937   }
 938 
 939   char token[1024];
 940   int  pos = 0;
 941 
 942   bool in_white_space = true;
 943   bool in_comment     = false;
 944   bool in_quote       = false;
 945   char quote_c        = 0;
 946   bool result         = true;
 947 
 948   int c = getc(stream);
 949   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 950     if (in_white_space) {
 951       if (in_comment) {
 952         if (c == '\n') in_comment = false;
 953       } else {
 954         if (c == '#') in_comment = true;
 955         else if (!isspace(c)) {
 956           in_white_space = false;
 957           token[pos++] = c;
 958         }
 959       }
 960     } else {
 961       if (c == '\n' || (!in_quote && isspace(c))) {
 962         // token ends at newline, or at unquoted whitespace
 963         // this allows a way to include spaces in string-valued options
 964         token[pos] = '\0';
 965         logOption(token);
 966         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 967         build_jvm_flags(token);
 968         pos = 0;
 969         in_white_space = true;
 970         in_quote = false;
 971       } else if (!in_quote && (c == '\'' || c == '"')) {
 972         in_quote = true;
 973         quote_c = c;
 974       } else if (in_quote && (c == quote_c)) {
 975         in_quote = false;
 976       } else {
 977         token[pos++] = c;
 978       }
 979     }
 980     c = getc(stream);
 981   }
 982   if (pos > 0) {
 983     token[pos] = '\0';
 984     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 985     build_jvm_flags(token);
 986   }
 987   fclose(stream);
 988   return result;
 989 }
 990 
 991 //=============================================================================================================
 992 // Parsing of properties (-D)
 993 
 994 const char* Arguments::get_property(const char* key) {
 995   return PropertyList_get_value(system_properties(), key);
 996 }
 997 
 998 bool Arguments::add_property(const char* prop) {
 999   const char* eq = strchr(prop, '=');
1000   char* key;
1001   // ns must be static--its address may be stored in a SystemProperty object.
1002   const static char ns[1] = {0};
1003   char* value = (char *)ns;
1004 
1005   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1006   key = AllocateHeap(key_len + 1, mtInternal);
1007   strncpy(key, prop, key_len);
1008   key[key_len] = '\0';
1009 
1010   if (eq != NULL) {
1011     size_t value_len = strlen(prop) - key_len - 1;
1012     value = AllocateHeap(value_len + 1, mtInternal);
1013     strncpy(value, &prop[key_len + 1], value_len + 1);
1014   }
1015 
1016   if (strcmp(key, "java.compiler") == 0) {
1017     process_java_compiler_argument(value);
1018     FreeHeap(key);
1019     if (eq != NULL) {
1020       FreeHeap(value);
1021     }
1022     return true;
1023   } else if (strcmp(key, "sun.java.command") == 0) {
1024     _java_command = value;
1025 
1026     // Record value in Arguments, but let it get passed to Java.
1027   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1028     // launcher.pid property is private and is processed
1029     // in process_sun_java_launcher_properties();
1030     // the sun.java.launcher property is passed on to the java application
1031     FreeHeap(key);
1032     if (eq != NULL) {
1033       FreeHeap(value);
1034     }
1035     return true;
1036   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1037     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1038     // its value without going through the property list or making a Java call.
1039     _java_vendor_url_bug = value;
1040   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1041     PropertyList_unique_add(&_system_properties, key, value, true);
1042     return true;
1043   }
1044   // Create new property and add at the end of the list
1045   PropertyList_unique_add(&_system_properties, key, value);
1046   return true;
1047 }
1048 
1049 //===========================================================================================================
1050 // Setting int/mixed/comp mode flags
1051 
1052 void Arguments::set_mode_flags(Mode mode) {
1053   // Set up default values for all flags.
1054   // If you add a flag to any of the branches below,
1055   // add a default value for it here.
1056   set_java_compiler(false);
1057   _mode                      = mode;
1058 
1059   // Ensure Agent_OnLoad has the correct initial values.
1060   // This may not be the final mode; mode may change later in onload phase.
1061   PropertyList_unique_add(&_system_properties, "java.vm.info",
1062                           (char*)VM_Version::vm_info_string(), false);
1063 
1064   UseInterpreter             = true;
1065   UseCompiler                = true;
1066   UseLoopCounter             = true;
1067 
1068 #ifndef ZERO
1069   // Turn these off for mixed and comp.  Leave them on for Zero.
1070   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1071     UseFastAccessorMethods = (mode == _int);
1072   }
1073   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1074     UseFastEmptyMethods = (mode == _int);
1075   }
1076 #endif
1077 
1078   // Default values may be platform/compiler dependent -
1079   // use the saved values
1080   ClipInlining               = Arguments::_ClipInlining;
1081   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1082   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1083   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1084 
1085   // Change from defaults based on mode
1086   switch (mode) {
1087   default:
1088     ShouldNotReachHere();
1089     break;
1090   case _int:
1091     UseCompiler              = false;
1092     UseLoopCounter           = false;
1093     AlwaysCompileLoopMethods = false;
1094     UseOnStackReplacement    = false;
1095     break;
1096   case _mixed:
1097     // same as default
1098     break;
1099   case _comp:
1100     UseInterpreter           = false;
1101     BackgroundCompilation    = false;
1102     ClipInlining             = false;
1103     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1104     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1105     // compile a level 4 (C2) and then continue executing it.
1106     if (TieredCompilation) {
1107       Tier3InvokeNotifyFreqLog = 0;
1108       Tier4InvocationThreshold = 0;
1109     }
1110     break;
1111   }
1112 }
1113 
1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1115 // Conflict: required to use shared spaces (-Xshare:on), but
1116 // incompatible command line options were chosen.
1117 
1118 static void no_shared_spaces(const char* message) {
1119   if (RequireSharedSpaces) {
1120     jio_fprintf(defaultStream::error_stream(),
1121       "Class data sharing is inconsistent with other specified options.\n");
1122     vm_exit_during_initialization("Unable to use shared archive.", message);
1123   } else {
1124     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1125   }
1126 }
1127 #endif
1128 
1129 void Arguments::set_tiered_flags() {
1130   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1131   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1132     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1133   }
1134   if (CompilationPolicyChoice < 2) {
1135     vm_exit_during_initialization(
1136       "Incompatible compilation policy selected", NULL);
1137   }
1138   // Increase the code cache size - tiered compiles a lot more.
1139   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1140     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1141   }
1142   if (!UseInterpreter) { // -Xcomp
1143     Tier3InvokeNotifyFreqLog = 0;
1144     Tier4InvocationThreshold = 0;
1145   }
1146 }
1147 
1148 /**
1149  * Returns the minimum number of compiler threads needed to run the JVM. The following
1150  * configurations are possible.
1151  *
1152  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1153  *    compiler threads is 0.
1154  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1155  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1156  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1157  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1158  *    C1 can be used, so the minimum number of compiler threads is 1.
1159  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1160  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1161  *    the minimum number of compiler threads is 2.
1162  */
1163 int Arguments::get_min_number_of_compiler_threads() {
1164 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1165   return 0;   // case 1
1166 #else
1167   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1168     return 1; // case 2 or case 3
1169   }
1170   return 2;   // case 4 (tiered)
1171 #endif
1172 }
1173 
1174 #if INCLUDE_ALL_GCS
1175 static void disable_adaptive_size_policy(const char* collector_name) {
1176   if (UseAdaptiveSizePolicy) {
1177     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1178       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1179               collector_name);
1180     }
1181     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1182   }
1183 }
1184 
1185 void Arguments::set_parnew_gc_flags() {
1186   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1187          "control point invariant");
1188   assert(UseParNewGC, "Error");
1189 
1190   // Turn off AdaptiveSizePolicy for parnew until it is complete.
1191   disable_adaptive_size_policy("UseParNewGC");
1192 
1193   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1194     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1195     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1196   } else if (ParallelGCThreads == 0) {
1197     jio_fprintf(defaultStream::error_stream(),
1198         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1199     vm_exit(1);
1200   }
1201 
1202   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1203   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1204   // we set them to 1024 and 1024.
1205   // See CR 6362902.
1206   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1207     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1208   }
1209   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1210     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1211   }
1212 
1213   // AlwaysTenure flag should make ParNew promote all at first collection.
1214   // See CR 6362902.
1215   if (AlwaysTenure) {
1216     FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1217   }
1218   // When using compressed oops, we use local overflow stacks,
1219   // rather than using a global overflow list chained through
1220   // the klass word of the object's pre-image.
1221   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1222     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1223       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1224     }
1225     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1226   }
1227   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1228 }
1229 
1230 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1231 // sparc/solaris for certain applications, but would gain from
1232 // further optimization and tuning efforts, and would almost
1233 // certainly gain from analysis of platform and environment.
1234 void Arguments::set_cms_and_parnew_gc_flags() {
1235   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1236   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1237 
1238   // If we are using CMS, we prefer to UseParNewGC,
1239   // unless explicitly forbidden.
1240   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1241     FLAG_SET_ERGO(bool, UseParNewGC, true);
1242   }
1243 
1244   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1245   disable_adaptive_size_policy("UseConcMarkSweepGC");
1246 
1247   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1248   // as needed.
1249   if (UseParNewGC) {
1250     set_parnew_gc_flags();
1251   }
1252 
1253   size_t max_heap = align_size_down(MaxHeapSize,
1254                                     CardTableRS::ct_max_alignment_constraint());
1255 
1256   // Now make adjustments for CMS
1257   intx   tenuring_default = (intx)6;
1258   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1259 
1260   // Preferred young gen size for "short" pauses:
1261   // upper bound depends on # of threads and NewRatio.
1262   const uintx parallel_gc_threads =
1263     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1264   const size_t preferred_max_new_size_unaligned =
1265     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1266   size_t preferred_max_new_size =
1267     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1268 
1269   // Unless explicitly requested otherwise, size young gen
1270   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1271 
1272   // If either MaxNewSize or NewRatio is set on the command line,
1273   // assume the user is trying to set the size of the young gen.
1274   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1275 
1276     // Set MaxNewSize to our calculated preferred_max_new_size unless
1277     // NewSize was set on the command line and it is larger than
1278     // preferred_max_new_size.
1279     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1280       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1281     } else {
1282       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1283     }
1284     if (PrintGCDetails && Verbose) {
1285       // Too early to use gclog_or_tty
1286       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1287     }
1288 
1289     // Code along this path potentially sets NewSize and OldSize
1290     if (PrintGCDetails && Verbose) {
1291       // Too early to use gclog_or_tty
1292       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1293            " initial_heap_size:  " SIZE_FORMAT
1294            " max_heap: " SIZE_FORMAT,
1295            min_heap_size(), InitialHeapSize, max_heap);
1296     }
1297     size_t min_new = preferred_max_new_size;
1298     if (FLAG_IS_CMDLINE(NewSize)) {
1299       min_new = NewSize;
1300     }
1301     if (max_heap > min_new && min_heap_size() > min_new) {
1302       // Unless explicitly requested otherwise, make young gen
1303       // at least min_new, and at most preferred_max_new_size.
1304       if (FLAG_IS_DEFAULT(NewSize)) {
1305         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1306         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1307         if (PrintGCDetails && Verbose) {
1308           // Too early to use gclog_or_tty
1309           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1310         }
1311       }
1312       // Unless explicitly requested otherwise, size old gen
1313       // so it's NewRatio x of NewSize.
1314       if (FLAG_IS_DEFAULT(OldSize)) {
1315         if (max_heap > NewSize) {
1316           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1317           if (PrintGCDetails && Verbose) {
1318             // Too early to use gclog_or_tty
1319             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1320           }
1321         }
1322       }
1323     }
1324   }
1325   // Unless explicitly requested otherwise, definitely
1326   // promote all objects surviving "tenuring_default" scavenges.
1327   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1328       FLAG_IS_DEFAULT(SurvivorRatio)) {
1329     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1330   }
1331   // If we decided above (or user explicitly requested)
1332   // `promote all' (via MaxTenuringThreshold := 0),
1333   // prefer minuscule survivor spaces so as not to waste
1334   // space for (non-existent) survivors
1335   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1336     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1337   }
1338   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1339   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1340   // This is done in order to make ParNew+CMS configuration to work
1341   // with YoungPLABSize and OldPLABSize options.
1342   // See CR 6362902.
1343   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1344     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1345       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1346       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1347       // the value (either from the command line or ergonomics) of
1348       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1349       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1350     } else {
1351       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1352       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1353       // we'll let it to take precedence.
1354       jio_fprintf(defaultStream::error_stream(),
1355                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1356                   " options are specified for the CMS collector."
1357                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1358     }
1359   }
1360   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1361     // OldPLAB sizing manually turned off: Use a larger default setting,
1362     // unless it was manually specified. This is because a too-low value
1363     // will slow down scavenges.
1364     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1365       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1366     }
1367   }
1368   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1369   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1370   // If either of the static initialization defaults have changed, note this
1371   // modification.
1372   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1373     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1374   }
1375   if (PrintGCDetails && Verbose) {
1376     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1377       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1378     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1379   }
1380 }
1381 #endif // INCLUDE_ALL_GCS
1382 
1383 void set_object_alignment() {
1384   // Object alignment.
1385   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1386   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1387   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1388   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1389   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1390   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1391 
1392   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1393   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1394 
1395   // Oop encoding heap max
1396   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1397 
1398 #if INCLUDE_ALL_GCS
1399   // Set CMS global values
1400   CompactibleFreeListSpace::set_cms_values();
1401 #endif // INCLUDE_ALL_GCS
1402 }
1403 
1404 bool verify_object_alignment() {
1405   // Object alignment.
1406   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1407     jio_fprintf(defaultStream::error_stream(),
1408                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1409                 (int)ObjectAlignmentInBytes);
1410     return false;
1411   }
1412   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1413     jio_fprintf(defaultStream::error_stream(),
1414                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1415                 (int)ObjectAlignmentInBytes, BytesPerLong);
1416     return false;
1417   }
1418   // It does not make sense to have big object alignment
1419   // since a space lost due to alignment will be greater
1420   // then a saved space from compressed oops.
1421   if ((int)ObjectAlignmentInBytes > 256) {
1422     jio_fprintf(defaultStream::error_stream(),
1423                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1424                 (int)ObjectAlignmentInBytes);
1425     return false;
1426   }
1427   // In case page size is very small.
1428   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1429     jio_fprintf(defaultStream::error_stream(),
1430                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1431                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1432     return false;
1433   }
1434   if(SurvivorAlignmentInBytes == 0) {
1435     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1436   } else {
1437     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1438       jio_fprintf(defaultStream::error_stream(),
1439             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1440             (int)SurvivorAlignmentInBytes);
1441       return false;
1442     }
1443     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1444       jio_fprintf(defaultStream::error_stream(),
1445           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1446           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1447       return false;
1448     }
1449   }
1450   return true;
1451 }
1452 
1453 size_t Arguments::max_heap_for_compressed_oops() {
1454   // Avoid sign flip.
1455   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1456   // We need to fit both the NULL page and the heap into the memory budget, while
1457   // keeping alignment constraints of the heap. To guarantee the latter, as the
1458   // NULL page is located before the heap, we pad the NULL page to the conservative
1459   // maximum alignment that the GC may ever impose upon the heap.
1460   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1461                                                         _conservative_max_heap_alignment);
1462 
1463   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1464   NOT_LP64(ShouldNotReachHere(); return 0);
1465 }
1466 
1467 bool Arguments::should_auto_select_low_pause_collector() {
1468   if (UseAutoGCSelectPolicy &&
1469       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1470       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1471     if (PrintGCDetails) {
1472       // Cannot use gclog_or_tty yet.
1473       tty->print_cr("Automatic selection of the low pause collector"
1474        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1475     }
1476     return true;
1477   }
1478   return false;
1479 }
1480 
1481 void Arguments::set_use_compressed_oops() {
1482 #ifndef ZERO
1483 #ifdef _LP64
1484   // MaxHeapSize is not set up properly at this point, but
1485   // the only value that can override MaxHeapSize if we are
1486   // to use UseCompressedOops is InitialHeapSize.
1487   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1488 
1489   if (max_heap_size <= max_heap_for_compressed_oops()) {
1490 #if !defined(COMPILER1) || defined(TIERED)
1491     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1492       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1493     }
1494 #endif
1495 #ifdef _WIN64
1496     if (UseLargePages && UseCompressedOops) {
1497       // Cannot allocate guard pages for implicit checks in indexed addressing
1498       // mode, when large pages are specified on windows.
1499       // This flag could be switched ON if narrow oop base address is set to 0,
1500       // see code in Universe::initialize_heap().
1501       Universe::set_narrow_oop_use_implicit_null_checks(false);
1502     }
1503 #endif //  _WIN64
1504   } else {
1505     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1506       warning("Max heap size too large for Compressed Oops");
1507       FLAG_SET_DEFAULT(UseCompressedOops, false);
1508       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1509     }
1510   }
1511 #endif // _LP64
1512 #endif // ZERO
1513 }
1514 
1515 
1516 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1517 // set_use_compressed_oops().
1518 void Arguments::set_use_compressed_klass_ptrs() {
1519 #ifndef ZERO
1520 #ifdef _LP64
1521   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1522   if (!UseCompressedOops) {
1523     if (UseCompressedClassPointers) {
1524       warning("UseCompressedClassPointers requires UseCompressedOops");
1525     }
1526     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1527   } else {
1528     // Turn on UseCompressedClassPointers too
1529     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1530       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1531     }
1532     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1533     if (UseCompressedClassPointers) {
1534       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1535         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1536         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1537       }
1538     }
1539   }
1540 #endif // _LP64
1541 #endif // !ZERO
1542 }
1543 
1544 void Arguments::set_conservative_max_heap_alignment() {
1545   // The conservative maximum required alignment for the heap is the maximum of
1546   // the alignments imposed by several sources: any requirements from the heap
1547   // itself, the collector policy and the maximum page size we may run the VM
1548   // with.
1549   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1550 #if INCLUDE_ALL_GCS
1551   if (UseParallelGC) {
1552     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1553   } else if (UseG1GC) {
1554     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1555   }
1556 #endif // INCLUDE_ALL_GCS
1557   _conservative_max_heap_alignment = MAX4(heap_alignment,
1558                                           (size_t)os::vm_allocation_granularity(),
1559                                           os::max_page_size(),
1560                                           CollectorPolicy::compute_heap_alignment());
1561 }
1562 
1563 void Arguments::select_gc_ergonomically() {
1564   if (os::is_server_class_machine()) {
1565     if (should_auto_select_low_pause_collector()) {
1566       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1567     } else {
1568       FLAG_SET_ERGO(bool, UseParallelGC, true);
1569     }
1570   }
1571 }
1572 
1573 void Arguments::select_gc() {
1574   if (!gc_selected()) {
1575     select_gc_ergonomically();
1576   }
1577 }
1578 
1579 void Arguments::set_ergonomics_flags() {
1580   select_gc();
1581 
1582 #ifdef COMPILER2
1583   // Shared spaces work fine with other GCs but causes bytecode rewriting
1584   // to be disabled, which hurts interpreter performance and decreases
1585   // server performance.  When -server is specified, keep the default off
1586   // unless it is asked for.  Future work: either add bytecode rewriting
1587   // at link time, or rewrite bytecodes in non-shared methods.
1588   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1589       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1590     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1591   }
1592 #endif
1593 
1594   set_conservative_max_heap_alignment();
1595 
1596 #ifndef ZERO
1597 #ifdef _LP64
1598   set_use_compressed_oops();
1599 
1600   // set_use_compressed_klass_ptrs() must be called after calling
1601   // set_use_compressed_oops().
1602   set_use_compressed_klass_ptrs();
1603 
1604   // Also checks that certain machines are slower with compressed oops
1605   // in vm_version initialization code.
1606 #endif // _LP64
1607 #endif // !ZERO
1608 }
1609 
1610 void Arguments::set_parallel_gc_flags() {
1611   assert(UseParallelGC || UseParallelOldGC, "Error");
1612   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1613   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1614     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1615   }
1616   FLAG_SET_DEFAULT(UseParallelGC, true);
1617 
1618   // If no heap maximum was requested explicitly, use some reasonable fraction
1619   // of the physical memory, up to a maximum of 1GB.
1620   FLAG_SET_DEFAULT(ParallelGCThreads,
1621                    Abstract_VM_Version::parallel_worker_threads());
1622   if (ParallelGCThreads == 0) {
1623     jio_fprintf(defaultStream::error_stream(),
1624         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1625     vm_exit(1);
1626   }
1627 
1628   if (UseAdaptiveSizePolicy) {
1629     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1630     // unless the user actually sets these flags.
1631     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1632       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1633       _min_heap_free_ratio = MinHeapFreeRatio;
1634     }
1635     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1636       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1637       _max_heap_free_ratio = MaxHeapFreeRatio;
1638     }
1639   }
1640 
1641   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1642   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1643   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1644   // See CR 6362902 for details.
1645   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1646     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1647        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1648     }
1649     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1650       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1651     }
1652   }
1653 
1654   if (UseParallelOldGC) {
1655     // Par compact uses lower default values since they are treated as
1656     // minimums.  These are different defaults because of the different
1657     // interpretation and are not ergonomically set.
1658     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1659       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1660     }
1661   }
1662 }
1663 
1664 void Arguments::set_g1_gc_flags() {
1665   assert(UseG1GC, "Error");
1666 #ifdef COMPILER1
1667   FastTLABRefill = false;
1668 #endif
1669   FLAG_SET_DEFAULT(ParallelGCThreads,
1670                      Abstract_VM_Version::parallel_worker_threads());
1671   if (ParallelGCThreads == 0) {
1672     FLAG_SET_DEFAULT(ParallelGCThreads,
1673                      Abstract_VM_Version::parallel_worker_threads());
1674   }
1675 
1676 #if INCLUDE_ALL_GCS
1677   if (G1ConcRefinementThreads == 0) {
1678     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1679   }
1680 #endif
1681 
1682   // MarkStackSize will be set (if it hasn't been set by the user)
1683   // when concurrent marking is initialized.
1684   // Its value will be based upon the number of parallel marking threads.
1685   // But we do set the maximum mark stack size here.
1686   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1687     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1688   }
1689 
1690   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1691     // In G1, we want the default GC overhead goal to be higher than
1692     // say in PS. So we set it here to 10%. Otherwise the heap might
1693     // be expanded more aggressively than we would like it to. In
1694     // fact, even 10% seems to not be high enough in some cases
1695     // (especially small GC stress tests that the main thing they do
1696     // is allocation). We might consider increase it further.
1697     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1698   }
1699 
1700   if (PrintGCDetails && Verbose) {
1701     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1702       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1703     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1704   }
1705 }
1706 
1707 #if !INCLUDE_ALL_GCS
1708 #ifdef ASSERT
1709 static bool verify_serial_gc_flags() {
1710   return (UseSerialGC &&
1711         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1712           UseParallelGC || UseParallelOldGC));
1713 }
1714 #endif // ASSERT
1715 #endif // INCLUDE_ALL_GCS
1716 
1717 void Arguments::set_gc_specific_flags() {
1718 #if INCLUDE_ALL_GCS
1719   // Set per-collector flags
1720   if (UseParallelGC || UseParallelOldGC) {
1721     set_parallel_gc_flags();
1722   } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1723     set_cms_and_parnew_gc_flags();
1724   } else if (UseParNewGC) {  // Skipped if CMS is set above
1725     set_parnew_gc_flags();
1726   } else if (UseG1GC) {
1727     set_g1_gc_flags();
1728   }
1729   check_deprecated_gcs();
1730   check_deprecated_gc_flags();
1731   if (AssumeMP && !UseSerialGC) {
1732     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1733       warning("If the number of processors is expected to increase from one, then"
1734               " you should configure the number of parallel GC threads appropriately"
1735               " using -XX:ParallelGCThreads=N");
1736     }
1737   }
1738   if (MinHeapFreeRatio == 100) {
1739     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1740     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1741   }
1742 #else // INCLUDE_ALL_GCS
1743   assert(verify_serial_gc_flags(), "SerialGC unset");
1744 #endif // INCLUDE_ALL_GCS
1745 }
1746 
1747 julong Arguments::limit_by_allocatable_memory(julong limit) {
1748   julong max_allocatable;
1749   julong result = limit;
1750   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1751     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1752   }
1753   return result;
1754 }
1755 
1756 void Arguments::set_heap_size() {
1757   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1758     // Deprecated flag
1759     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1760   }
1761 
1762   const julong phys_mem =
1763     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1764                             : (julong)MaxRAM;
1765 
1766   // If the maximum heap size has not been set with -Xmx,
1767   // then set it as fraction of the size of physical memory,
1768   // respecting the maximum and minimum sizes of the heap.
1769   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1770     julong reasonable_max = phys_mem / MaxRAMFraction;
1771 
1772     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1773       // Small physical memory, so use a minimum fraction of it for the heap
1774       reasonable_max = phys_mem / MinRAMFraction;
1775     } else {
1776       // Not-small physical memory, so require a heap at least
1777       // as large as MaxHeapSize
1778       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1779     }
1780     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1781       // Limit the heap size to ErgoHeapSizeLimit
1782       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1783     }
1784     if (UseCompressedOops) {
1785       // Limit the heap size to the maximum possible when using compressed oops
1786       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1787       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1788         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1789         // but it should be not less than default MaxHeapSize.
1790         max_coop_heap -= HeapBaseMinAddress;
1791       }
1792       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1793     }
1794     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1795 
1796     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1797       // An initial heap size was specified on the command line,
1798       // so be sure that the maximum size is consistent.  Done
1799       // after call to limit_by_allocatable_memory because that
1800       // method might reduce the allocation size.
1801       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1802     }
1803 
1804     if (PrintGCDetails && Verbose) {
1805       // Cannot use gclog_or_tty yet.
1806       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1807     }
1808     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1809   }
1810 
1811   // If the minimum or initial heap_size have not been set or requested to be set
1812   // ergonomically, set them accordingly.
1813   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1814     julong reasonable_minimum = (julong)(OldSize + NewSize);
1815 
1816     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1817 
1818     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1819 
1820     if (InitialHeapSize == 0) {
1821       julong reasonable_initial = phys_mem / InitialRAMFraction;
1822 
1823       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1824       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1825 
1826       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1827 
1828       if (PrintGCDetails && Verbose) {
1829         // Cannot use gclog_or_tty yet.
1830         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1831       }
1832       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1833     }
1834     // If the minimum heap size has not been set (via -Xms),
1835     // synchronize with InitialHeapSize to avoid errors with the default value.
1836     if (min_heap_size() == 0) {
1837       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1838       if (PrintGCDetails && Verbose) {
1839         // Cannot use gclog_or_tty yet.
1840         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1841       }
1842     }
1843   }
1844 }
1845 
1846 // This must be called after ergonomics because we want bytecode rewriting
1847 // if the server compiler is used, or if UseSharedSpaces is disabled.
1848 void Arguments::set_bytecode_flags() {
1849   // Better not attempt to store into a read-only space.
1850   if (UseSharedSpaces) {
1851     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1852     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1853   }
1854 
1855   if (!RewriteBytecodes) {
1856     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1857   }
1858 }
1859 
1860 // Aggressive optimization flags  -XX:+AggressiveOpts
1861 void Arguments::set_aggressive_opts_flags() {
1862 #ifdef COMPILER2
1863   if (AggressiveUnboxing) {
1864     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1865       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1866     } else if (!EliminateAutoBox) {
1867       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1868       AggressiveUnboxing = false;
1869     }
1870     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1871       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1872     } else if (!DoEscapeAnalysis) {
1873       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1874       AggressiveUnboxing = false;
1875     }
1876   }
1877   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1878     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1879       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1880     }
1881     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1882       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1883     }
1884 
1885     // Feed the cache size setting into the JDK
1886     char buffer[1024];
1887     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1888     add_property(buffer);
1889   }
1890   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1891     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1892   }
1893 #endif
1894 
1895   if (AggressiveOpts) {
1896 // Sample flag setting code
1897 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1898 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1899 //    }
1900   }
1901 }
1902 
1903 //===========================================================================================================
1904 // Parsing of java.compiler property
1905 
1906 void Arguments::process_java_compiler_argument(char* arg) {
1907   // For backwards compatibility, Djava.compiler=NONE or ""
1908   // causes us to switch to -Xint mode UNLESS -Xdebug
1909   // is also specified.
1910   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1911     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
1912   }
1913 }
1914 
1915 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1916   _sun_java_launcher = strdup(launcher);
1917   if (strcmp("gamma", _sun_java_launcher) == 0) {
1918     _created_by_gamma_launcher = true;
1919   }
1920 }
1921 
1922 bool Arguments::created_by_java_launcher() {
1923   assert(_sun_java_launcher != NULL, "property must have value");
1924   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1925 }
1926 
1927 bool Arguments::created_by_gamma_launcher() {
1928   return _created_by_gamma_launcher;
1929 }
1930 
1931 //===========================================================================================================
1932 // Parsing of main arguments
1933 
1934 bool Arguments::verify_interval(uintx val, uintx min,
1935                                 uintx max, const char* name) {
1936   // Returns true iff value is in the inclusive interval [min..max]
1937   // false, otherwise.
1938   if (val >= min && val <= max) {
1939     return true;
1940   }
1941   jio_fprintf(defaultStream::error_stream(),
1942               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1943               " and " UINTX_FORMAT "\n",
1944               name, val, min, max);
1945   return false;
1946 }
1947 
1948 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1949   // Returns true if given value is at least specified min threshold
1950   // false, otherwise.
1951   if (val >= min ) {
1952       return true;
1953   }
1954   jio_fprintf(defaultStream::error_stream(),
1955               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1956               name, val, min);
1957   return false;
1958 }
1959 
1960 bool Arguments::verify_percentage(uintx value, const char* name) {
1961   if (is_percentage(value)) {
1962     return true;
1963   }
1964   jio_fprintf(defaultStream::error_stream(),
1965               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1966               name, value);
1967   return false;
1968 }
1969 
1970 // check if do gclog rotation
1971 // +UseGCLogFileRotation is a must,
1972 // no gc log rotation when log file not supplied or
1973 // NumberOfGCLogFiles is 0
1974 void check_gclog_consistency() {
1975   if (UseGCLogFileRotation) {
1976     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1977       jio_fprintf(defaultStream::output_stream(),
1978                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1979                   "where num_of_file > 0\n"
1980                   "GC log rotation is turned off\n");
1981       UseGCLogFileRotation = false;
1982     }
1983   }
1984 
1985   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1986     FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1987     jio_fprintf(defaultStream::output_stream(),
1988                 "GCLogFileSize changed to minimum 8K\n");
1989   }
1990 }
1991 
1992 // This function is called for -Xloggc:<filename>, it can be used
1993 // to check if a given file name(or string) conforms to the following
1994 // specification:
1995 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1996 // %p and %t only allowed once. We only limit usage of filename not path
1997 bool is_filename_valid(const char *file_name) {
1998   const char* p = file_name;
1999   char file_sep = os::file_separator()[0];
2000   const char* cp;
2001   // skip prefix path
2002   for (cp = file_name; *cp != '\0'; cp++) {
2003     if (*cp == '/' || *cp == file_sep) {
2004       p = cp + 1;
2005     }
2006   }
2007 
2008   int count_p = 0;
2009   int count_t = 0;
2010   while (*p != '\0') {
2011     if ((*p >= '0' && *p <= '9') ||
2012         (*p >= 'A' && *p <= 'Z') ||
2013         (*p >= 'a' && *p <= 'z') ||
2014          *p == '-'               ||
2015          *p == '_'               ||
2016          *p == '.') {
2017        p++;
2018        continue;
2019     }
2020     if (*p == '%') {
2021       if(*(p + 1) == 'p') {
2022         p += 2;
2023         count_p ++;
2024         continue;
2025       }
2026       if (*(p + 1) == 't') {
2027         p += 2;
2028         count_t ++;
2029         continue;
2030       }
2031     }
2032     return false;
2033   }
2034   return count_p < 2 && count_t < 2;
2035 }
2036 
2037 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2038   if (!is_percentage(min_heap_free_ratio)) {
2039     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2040     return false;
2041   }
2042   if (min_heap_free_ratio > MaxHeapFreeRatio) {
2043     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2044                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2045                   MaxHeapFreeRatio);
2046     return false;
2047   }
2048   // This does not set the flag itself, but stores the value in a safe place for later usage.
2049   _min_heap_free_ratio = min_heap_free_ratio;
2050   return true;
2051 }
2052 
2053 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2054   if (!is_percentage(max_heap_free_ratio)) {
2055     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2056     return false;
2057   }
2058   if (max_heap_free_ratio < MinHeapFreeRatio) {
2059     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2060                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2061                   MinHeapFreeRatio);
2062     return false;
2063   }
2064   // This does not set the flag itself, but stores the value in a safe place for later usage.
2065   _max_heap_free_ratio = max_heap_free_ratio;
2066   return true;
2067 }
2068 
2069 // Check consistency of GC selection
2070 bool Arguments::check_gc_consistency() {
2071   check_gclog_consistency();
2072   bool status = true;
2073   // Ensure that the user has not selected conflicting sets
2074   // of collectors. [Note: this check is merely a user convenience;
2075   // collectors over-ride each other so that only a non-conflicting
2076   // set is selected; however what the user gets is not what they
2077   // may have expected from the combination they asked for. It's
2078   // better to reduce user confusion by not allowing them to
2079   // select conflicting combinations.
2080   uint i = 0;
2081   if (UseSerialGC)                       i++;
2082   if (UseConcMarkSweepGC || UseParNewGC) i++;
2083   if (UseParallelGC || UseParallelOldGC) i++;
2084   if (UseG1GC)                           i++;
2085   if (i > 1) {
2086     jio_fprintf(defaultStream::error_stream(),
2087                 "Conflicting collector combinations in option list; "
2088                 "please refer to the release notes for the combinations "
2089                 "allowed\n");
2090     status = false;
2091   }
2092   return status;
2093 }
2094 
2095 void Arguments::check_deprecated_gcs() {
2096   if (UseConcMarkSweepGC && !UseParNewGC) {
2097     warning("Using the DefNew young collector with the CMS collector is deprecated "
2098         "and will likely be removed in a future release");
2099   }
2100 
2101   if (UseParNewGC && !UseConcMarkSweepGC) {
2102     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2103     // set up UseSerialGC properly, so that can't be used in the check here.
2104     warning("Using the ParNew young collector with the Serial old collector is deprecated "
2105         "and will likely be removed in a future release");
2106   }
2107 
2108   if (CMSIncrementalMode) {
2109     warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2110   }
2111 }
2112 
2113 void Arguments::check_deprecated_gc_flags() {
2114   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2115     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2116             "and will likely be removed in future release");
2117   }
2118   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2119     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2120         "Use MaxRAMFraction instead.");
2121   }
2122   if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2123     warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2124   }
2125   if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2126     warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2127   }
2128   if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2129     warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2130   }
2131 }
2132 
2133 // Check stack pages settings
2134 bool Arguments::check_stack_pages()
2135 {
2136   bool status = true;
2137   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2138   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2139   // greater stack shadow pages can't generate instruction to bang stack
2140   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2141   return status;
2142 }
2143 
2144 // Check the consistency of vm_init_args
2145 bool Arguments::check_vm_args_consistency() {
2146   // Method for adding checks for flag consistency.
2147   // The intent is to warn the user of all possible conflicts,
2148   // before returning an error.
2149   // Note: Needs platform-dependent factoring.
2150   bool status = true;
2151 
2152   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2153   // builds so the cost of stack banging can be measured.
2154 #if (defined(PRODUCT) && defined(SOLARIS))
2155   if (!UseBoundThreads && !UseStackBanging) {
2156     jio_fprintf(defaultStream::error_stream(),
2157                 "-UseStackBanging conflicts with -UseBoundThreads\n");
2158 
2159      status = false;
2160   }
2161 #endif
2162 
2163   if (TLABRefillWasteFraction == 0) {
2164     jio_fprintf(defaultStream::error_stream(),
2165                 "TLABRefillWasteFraction should be a denominator, "
2166                 "not " SIZE_FORMAT "\n",
2167                 TLABRefillWasteFraction);
2168     status = false;
2169   }
2170 
2171   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2172                               "AdaptiveSizePolicyWeight");
2173   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2174 
2175   // Divide by bucket size to prevent a large size from causing rollover when
2176   // calculating amount of memory needed to be allocated for the String table.
2177   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2178     (max_uintx / StringTable::bucket_size()), "StringTable size");
2179 
2180   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2181     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2182 
2183   {
2184     // Using "else if" below to avoid printing two error messages if min > max.
2185     // This will also prevent us from reporting both min>100 and max>100 at the
2186     // same time, but that is less annoying than printing two identical errors IMHO.
2187     FormatBuffer<80> err_msg("%s","");
2188     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2189       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2190       status = false;
2191     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2192       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2193       status = false;
2194     }
2195   }
2196 
2197   // Min/MaxMetaspaceFreeRatio
2198   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2199   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2200 
2201   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2202     jio_fprintf(defaultStream::error_stream(),
2203                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2204                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2205                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2206                 MinMetaspaceFreeRatio,
2207                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2208                 MaxMetaspaceFreeRatio);
2209     status = false;
2210   }
2211 
2212   // Trying to keep 100% free is not practical
2213   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2214 
2215   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2216     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2217   }
2218 
2219   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2220     // Settings to encourage splitting.
2221     if (!FLAG_IS_CMDLINE(NewRatio)) {
2222       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2223     }
2224     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2225       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2226     }
2227   }
2228 
2229   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2230   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2231   if (GCTimeLimit == 100) {
2232     // Turn off gc-overhead-limit-exceeded checks
2233     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2234   }
2235 
2236   status = status && check_gc_consistency();
2237   status = status && check_stack_pages();
2238 
2239   if (CMSIncrementalMode) {
2240     if (!UseConcMarkSweepGC) {
2241       jio_fprintf(defaultStream::error_stream(),
2242                   "error:  invalid argument combination.\n"
2243                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2244                   "selected in order\nto use CMSIncrementalMode.\n");
2245       status = false;
2246     } else {
2247       status = status && verify_percentage(CMSIncrementalDutyCycle,
2248                                   "CMSIncrementalDutyCycle");
2249       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2250                                   "CMSIncrementalDutyCycleMin");
2251       status = status && verify_percentage(CMSIncrementalSafetyFactor,
2252                                   "CMSIncrementalSafetyFactor");
2253       status = status && verify_percentage(CMSIncrementalOffset,
2254                                   "CMSIncrementalOffset");
2255       status = status && verify_percentage(CMSExpAvgFactor,
2256                                   "CMSExpAvgFactor");
2257       // If it was not set on the command line, set
2258       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2259       if (CMSInitiatingOccupancyFraction < 0) {
2260         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2261       }
2262     }
2263   }
2264 
2265   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2266   // insists that we hold the requisite locks so that the iteration is
2267   // MT-safe. For the verification at start-up and shut-down, we don't
2268   // yet have a good way of acquiring and releasing these locks,
2269   // which are not visible at the CollectedHeap level. We want to
2270   // be able to acquire these locks and then do the iteration rather
2271   // than just disable the lock verification. This will be fixed under
2272   // bug 4788986.
2273   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2274     if (VerifyDuringStartup) {
2275       warning("Heap verification at start-up disabled "
2276               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2277       VerifyDuringStartup = false; // Disable verification at start-up
2278     }
2279 
2280     if (VerifyBeforeExit) {
2281       warning("Heap verification at shutdown disabled "
2282               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2283       VerifyBeforeExit = false; // Disable verification at shutdown
2284     }
2285   }
2286 
2287   // Note: only executed in non-PRODUCT mode
2288   if (!UseAsyncConcMarkSweepGC &&
2289       (ExplicitGCInvokesConcurrent ||
2290        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2291     jio_fprintf(defaultStream::error_stream(),
2292                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2293                 " with -UseAsyncConcMarkSweepGC");
2294     status = false;
2295   }
2296 
2297   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2298 
2299 #if INCLUDE_ALL_GCS
2300   if (UseG1GC) {
2301     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2302     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2303     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2304 
2305     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2306                                          "InitiatingHeapOccupancyPercent");
2307     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2308                                         "G1RefProcDrainInterval");
2309     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2310                                         "G1ConcMarkStepDurationMillis");
2311     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2312                                        "G1ConcRSHotCardLimit");
2313     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2314                                        "G1ConcRSLogCacheSize");
2315     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2316                                        "StringDeduplicationAgeThreshold");
2317   }
2318   if (UseConcMarkSweepGC) {
2319     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2320     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2321     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2322     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2323 
2324     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2325 
2326     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2327     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2328     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2329 
2330     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2331 
2332     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2333     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2334 
2335     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2336     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2337     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2338 
2339     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2340 
2341     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2342 
2343     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2344     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2345     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2346     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2347     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2348   }
2349 
2350   if (UseParallelGC || UseParallelOldGC) {
2351     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2352     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2353 
2354     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2355     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2356 
2357     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2358     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2359 
2360     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2361 
2362     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2363   }
2364 #endif // INCLUDE_ALL_GCS
2365 
2366   status = status && verify_interval(RefDiscoveryPolicy,
2367                                      ReferenceProcessor::DiscoveryPolicyMin,
2368                                      ReferenceProcessor::DiscoveryPolicyMax,
2369                                      "RefDiscoveryPolicy");
2370 
2371   // Limit the lower bound of this flag to 1 as it is used in a division
2372   // expression.
2373   status = status && verify_interval(TLABWasteTargetPercent,
2374                                      1, 100, "TLABWasteTargetPercent");
2375 
2376   status = status && verify_object_alignment();
2377 
2378   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2379                                       "CompressedClassSpaceSize");
2380 
2381   status = status && verify_interval(MarkStackSizeMax,
2382                                   1, (max_jint - 1), "MarkStackSizeMax");
2383   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2384 
2385   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2386 
2387   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2388 
2389   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2390 
2391   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2392   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2393 
2394   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2395 
2396   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2397   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2398   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2399   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2400 
2401   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2402   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2403 
2404   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2405   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2406   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2407 
2408   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2409   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2410 
2411   // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2412   // just for that, so hardcode here.
2413   status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2414   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2415   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2416   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2417 
2418   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2419 #ifdef COMPILER1
2420   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2421 #endif
2422 
2423   if (PrintNMTStatistics) {
2424 #if INCLUDE_NMT
2425     if (MemTracker::tracking_level() == NMT_off) {
2426 #endif // INCLUDE_NMT
2427       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2428       PrintNMTStatistics = false;
2429 #if INCLUDE_NMT
2430     }
2431 #endif
2432   }
2433 
2434   // Need to limit the extent of the padding to reasonable size.
2435   // 8K is well beyond the reasonable HW cache line size, even with the
2436   // aggressive prefetching, while still leaving the room for segregating
2437   // among the distinct pages.
2438   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2439     jio_fprintf(defaultStream::error_stream(),
2440                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2441                 ContendedPaddingWidth, 0, 8192);
2442     status = false;
2443   }
2444 
2445   // Need to enforce the padding not to break the existing field alignments.
2446   // It is sufficient to check against the largest type size.
2447   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2448     jio_fprintf(defaultStream::error_stream(),
2449                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2450                 ContendedPaddingWidth, BytesPerLong);
2451     status = false;
2452   }
2453 
2454   // Check lower bounds of the code cache
2455   // Template Interpreter code is approximately 3X larger in debug builds.
2456   uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2457   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2458     jio_fprintf(defaultStream::error_stream(),
2459                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2460                 os::vm_page_size()/K);
2461     status = false;
2462   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2463     jio_fprintf(defaultStream::error_stream(),
2464                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2465                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2466     status = false;
2467   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2468     jio_fprintf(defaultStream::error_stream(),
2469                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2470                 min_code_cache_size/K);
2471     status = false;
2472   } else if (ReservedCodeCacheSize > 2*G) {
2473     // Code cache size larger than MAXINT is not supported.
2474     jio_fprintf(defaultStream::error_stream(),
2475                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2476                 (2*G)/M);
2477     status = false;
2478   }
2479 
2480   status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2481   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2482 
2483   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2484     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2485   }
2486 
2487 #ifdef COMPILER1
2488   status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2489 #endif
2490 
2491   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2492   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2493   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2494   // Check the minimum number of compiler threads
2495   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2496 
2497   return status;
2498 }
2499 
2500 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2501   const char* option_type) {
2502   if (ignore) return false;
2503 
2504   const char* spacer = " ";
2505   if (option_type == NULL) {
2506     option_type = ++spacer; // Set both to the empty string.
2507   }
2508 
2509   if (os::obsolete_option(option)) {
2510     jio_fprintf(defaultStream::error_stream(),
2511                 "Obsolete %s%soption: %s\n", option_type, spacer,
2512       option->optionString);
2513     return false;
2514   } else {
2515     jio_fprintf(defaultStream::error_stream(),
2516                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2517       option->optionString);
2518     return true;
2519   }
2520 }
2521 
2522 static const char* user_assertion_options[] = {
2523   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2524 };
2525 
2526 static const char* system_assertion_options[] = {
2527   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2528 };
2529 
2530 // Return true if any of the strings in null-terminated array 'names' matches.
2531 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2532 // the option must match exactly.
2533 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2534   bool tail_allowed) {
2535   for (/* empty */; *names != NULL; ++names) {
2536     if (match_option(option, *names, tail)) {
2537       if (**tail == '\0' || tail_allowed && **tail == ':') {
2538         return true;
2539       }
2540     }
2541   }
2542   return false;
2543 }
2544 
2545 bool Arguments::parse_uintx(const char* value,
2546                             uintx* uintx_arg,
2547                             uintx min_size) {
2548 
2549   // Check the sign first since atomull() parses only unsigned values.
2550   bool value_is_positive = !(*value == '-');
2551 
2552   if (value_is_positive) {
2553     julong n;
2554     bool good_return = atomull(value, &n);
2555     if (good_return) {
2556       bool above_minimum = n >= min_size;
2557       bool value_is_too_large = n > max_uintx;
2558 
2559       if (above_minimum && !value_is_too_large) {
2560         *uintx_arg = n;
2561         return true;
2562       }
2563     }
2564   }
2565   return false;
2566 }
2567 
2568 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2569                                                   julong* long_arg,
2570                                                   julong min_size) {
2571   if (!atomull(s, long_arg)) return arg_unreadable;
2572   return check_memory_size(*long_arg, min_size);
2573 }
2574 
2575 // Parse JavaVMInitArgs structure
2576 
2577 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2578   // For components of the system classpath.
2579   SysClassPath scp(Arguments::get_sysclasspath());
2580   bool scp_assembly_required = false;
2581 
2582   // Save default settings for some mode flags
2583   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2584   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2585   Arguments::_ClipInlining             = ClipInlining;
2586   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2587 
2588   // Setup flags for mixed which is the default
2589   set_mode_flags(_mixed);
2590 
2591   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2592   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2593   if (result != JNI_OK) {
2594     return result;
2595   }
2596 
2597   // Parse JavaVMInitArgs structure passed in
2598   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2599   if (result != JNI_OK) {
2600     return result;
2601   }
2602 
2603   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2604   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2605   if (result != JNI_OK) {
2606     return result;
2607   }
2608 
2609   // Do final processing now that all arguments have been parsed
2610   result = finalize_vm_init_args(&scp, scp_assembly_required);
2611   if (result != JNI_OK) {
2612     return result;
2613   }
2614 
2615   return JNI_OK;
2616 }
2617 
2618 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2619 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2620 // are dealing with -agentpath (case where name is a path), otherwise with
2621 // -agentlib
2622 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2623   char *_name;
2624   const char *_hprof = "hprof", *_jdwp = "jdwp";
2625   size_t _len_hprof, _len_jdwp, _len_prefix;
2626 
2627   if (is_path) {
2628     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2629       return false;
2630     }
2631 
2632     _name++;  // skip past last path separator
2633     _len_prefix = strlen(JNI_LIB_PREFIX);
2634 
2635     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2636       return false;
2637     }
2638 
2639     _name += _len_prefix;
2640     _len_hprof = strlen(_hprof);
2641     _len_jdwp = strlen(_jdwp);
2642 
2643     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2644       _name += _len_hprof;
2645     }
2646     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2647       _name += _len_jdwp;
2648     }
2649     else {
2650       return false;
2651     }
2652 
2653     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2654       return false;
2655     }
2656 
2657     return true;
2658   }
2659 
2660   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2661     return true;
2662   }
2663 
2664   return false;
2665 }
2666 
2667 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2668                                        SysClassPath* scp_p,
2669                                        bool* scp_assembly_required_p,
2670                                        Flag::Flags origin) {
2671   // Remaining part of option string
2672   const char* tail;
2673 
2674   // iterate over arguments
2675   for (int index = 0; index < args->nOptions; index++) {
2676     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2677 
2678     const JavaVMOption* option = args->options + index;
2679 
2680     if (!match_option(option, "-Djava.class.path", &tail) &&
2681         !match_option(option, "-Dsun.java.command", &tail) &&
2682         !match_option(option, "-Dsun.java.launcher", &tail)) {
2683 
2684         // add all jvm options to the jvm_args string. This string
2685         // is used later to set the java.vm.args PerfData string constant.
2686         // the -Djava.class.path and the -Dsun.java.command options are
2687         // omitted from jvm_args string as each have their own PerfData
2688         // string constant object.
2689         build_jvm_args(option->optionString);
2690     }
2691 
2692     // -verbose:[class/gc/jni]
2693     if (match_option(option, "-verbose", &tail)) {
2694       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2695         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2696         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2697       } else if (!strcmp(tail, ":gc")) {
2698         FLAG_SET_CMDLINE(bool, PrintGC, true);
2699       } else if (!strcmp(tail, ":jni")) {
2700         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2701       }
2702     // -da / -ea / -disableassertions / -enableassertions
2703     // These accept an optional class/package name separated by a colon, e.g.,
2704     // -da:java.lang.Thread.
2705     } else if (match_option(option, user_assertion_options, &tail, true)) {
2706       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2707       if (*tail == '\0') {
2708         JavaAssertions::setUserClassDefault(enable);
2709       } else {
2710         assert(*tail == ':', "bogus match by match_option()");
2711         JavaAssertions::addOption(tail + 1, enable);
2712       }
2713     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2714     } else if (match_option(option, system_assertion_options, &tail, false)) {
2715       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2716       JavaAssertions::setSystemClassDefault(enable);
2717     // -bootclasspath:
2718     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2719       scp_p->reset_path(tail);
2720       *scp_assembly_required_p = true;
2721     // -bootclasspath/a:
2722     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2723       scp_p->add_suffix(tail);
2724       *scp_assembly_required_p = true;
2725     // -bootclasspath/p:
2726     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2727       scp_p->add_prefix(tail);
2728       *scp_assembly_required_p = true;
2729     // -Xrun
2730     } else if (match_option(option, "-Xrun", &tail)) {
2731       if (tail != NULL) {
2732         const char* pos = strchr(tail, ':');
2733         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2734         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2735         name[len] = '\0';
2736 
2737         char *options = NULL;
2738         if(pos != NULL) {
2739           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2740           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2741         }
2742 #if !INCLUDE_JVMTI
2743         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2744           jio_fprintf(defaultStream::error_stream(),
2745             "Profiling and debugging agents are not supported in this VM\n");
2746           return JNI_ERR;
2747         }
2748 #endif // !INCLUDE_JVMTI
2749         add_init_library(name, options);
2750       }
2751     // -agentlib and -agentpath
2752     } else if (match_option(option, "-agentlib:", &tail) ||
2753           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2754       if(tail != NULL) {
2755         const char* pos = strchr(tail, '=');
2756         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2757         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2758         name[len] = '\0';
2759 
2760         char *options = NULL;
2761         if(pos != NULL) {
2762           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2763         }
2764 #if !INCLUDE_JVMTI
2765         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2766           jio_fprintf(defaultStream::error_stream(),
2767             "Profiling and debugging agents are not supported in this VM\n");
2768           return JNI_ERR;
2769         }
2770 #endif // !INCLUDE_JVMTI
2771         add_init_agent(name, options, is_absolute_path);
2772       }
2773     // -javaagent
2774     } else if (match_option(option, "-javaagent:", &tail)) {
2775 #if !INCLUDE_JVMTI
2776       jio_fprintf(defaultStream::error_stream(),
2777         "Instrumentation agents are not supported in this VM\n");
2778       return JNI_ERR;
2779 #else
2780       if(tail != NULL) {
2781         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2782         add_init_agent("instrument", options, false);
2783       }
2784 #endif // !INCLUDE_JVMTI
2785     // -Xnoclassgc
2786     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2787       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2788     // -Xincgc: i-CMS
2789     } else if (match_option(option, "-Xincgc", &tail)) {
2790       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2791       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2792     // -Xnoincgc: no i-CMS
2793     } else if (match_option(option, "-Xnoincgc", &tail)) {
2794       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2795       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2796     // -Xconcgc
2797     } else if (match_option(option, "-Xconcgc", &tail)) {
2798       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2799     // -Xnoconcgc
2800     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2801       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2802     // -Xbatch
2803     } else if (match_option(option, "-Xbatch", &tail)) {
2804       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2805     // -Xmn for compatibility with other JVM vendors
2806     } else if (match_option(option, "-Xmn", &tail)) {
2807       julong long_initial_young_size = 0;
2808       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2809       if (errcode != arg_in_range) {
2810         jio_fprintf(defaultStream::error_stream(),
2811                     "Invalid initial young generation size: %s\n", option->optionString);
2812         describe_range_error(errcode);
2813         return JNI_EINVAL;
2814       }
2815       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2816       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2817     // -Xms
2818     } else if (match_option(option, "-Xms", &tail)) {
2819       julong long_initial_heap_size = 0;
2820       // an initial heap size of 0 means automatically determine
2821       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2822       if (errcode != arg_in_range) {
2823         jio_fprintf(defaultStream::error_stream(),
2824                     "Invalid initial heap size: %s\n", option->optionString);
2825         describe_range_error(errcode);
2826         return JNI_EINVAL;
2827       }
2828       set_min_heap_size((uintx)long_initial_heap_size);
2829       // Currently the minimum size and the initial heap sizes are the same.
2830       // Can be overridden with -XX:InitialHeapSize.
2831       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2832     // -Xmx
2833     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2834       julong long_max_heap_size = 0;
2835       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2836       if (errcode != arg_in_range) {
2837         jio_fprintf(defaultStream::error_stream(),
2838                     "Invalid maximum heap size: %s\n", option->optionString);
2839         describe_range_error(errcode);
2840         return JNI_EINVAL;
2841       }
2842       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2843     // Xmaxf
2844     } else if (match_option(option, "-Xmaxf", &tail)) {
2845       char* err;
2846       int maxf = (int)(strtod(tail, &err) * 100);
2847       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2848         jio_fprintf(defaultStream::error_stream(),
2849                     "Bad max heap free percentage size: %s\n",
2850                     option->optionString);
2851         return JNI_EINVAL;
2852       } else {
2853         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2854       }
2855     // Xminf
2856     } else if (match_option(option, "-Xminf", &tail)) {
2857       char* err;
2858       int minf = (int)(strtod(tail, &err) * 100);
2859       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2860         jio_fprintf(defaultStream::error_stream(),
2861                     "Bad min heap free percentage size: %s\n",
2862                     option->optionString);
2863         return JNI_EINVAL;
2864       } else {
2865         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2866       }
2867     // -Xss
2868     } else if (match_option(option, "-Xss", &tail)) {
2869       julong long_ThreadStackSize = 0;
2870       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2871       if (errcode != arg_in_range) {
2872         jio_fprintf(defaultStream::error_stream(),
2873                     "Invalid thread stack size: %s\n", option->optionString);
2874         describe_range_error(errcode);
2875         return JNI_EINVAL;
2876       }
2877       // Internally track ThreadStackSize in units of 1024 bytes.
2878       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2879                               round_to((int)long_ThreadStackSize, K) / K);
2880     // -Xoss
2881     } else if (match_option(option, "-Xoss", &tail)) {
2882           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2883     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2884       julong long_CodeCacheExpansionSize = 0;
2885       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2886       if (errcode != arg_in_range) {
2887         jio_fprintf(defaultStream::error_stream(),
2888                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2889                    os::vm_page_size()/K);
2890         return JNI_EINVAL;
2891       }
2892       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2893     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2894                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2895       julong long_ReservedCodeCacheSize = 0;
2896 
2897       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2898       if (errcode != arg_in_range) {
2899         jio_fprintf(defaultStream::error_stream(),
2900                     "Invalid maximum code cache size: %s.\n", option->optionString);
2901         return JNI_EINVAL;
2902       }
2903       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2904       //-XX:IncreaseFirstTierCompileThresholdAt=
2905       } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2906         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2907         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2908           jio_fprintf(defaultStream::error_stream(),
2909                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2910                       option->optionString);
2911           return JNI_EINVAL;
2912         }
2913         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2914     // -green
2915     } else if (match_option(option, "-green", &tail)) {
2916       jio_fprintf(defaultStream::error_stream(),
2917                   "Green threads support not available\n");
2918           return JNI_EINVAL;
2919     // -native
2920     } else if (match_option(option, "-native", &tail)) {
2921           // HotSpot always uses native threads, ignore silently for compatibility
2922     // -Xsqnopause
2923     } else if (match_option(option, "-Xsqnopause", &tail)) {
2924           // EVM option, ignore silently for compatibility
2925     // -Xrs
2926     } else if (match_option(option, "-Xrs", &tail)) {
2927           // Classic/EVM option, new functionality
2928       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2929     } else if (match_option(option, "-Xusealtsigs", &tail)) {
2930           // change default internal VM signals used - lower case for back compat
2931       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2932     // -Xoptimize
2933     } else if (match_option(option, "-Xoptimize", &tail)) {
2934           // EVM option, ignore silently for compatibility
2935     // -Xprof
2936     } else if (match_option(option, "-Xprof", &tail)) {
2937 #if INCLUDE_FPROF
2938       _has_profile = true;
2939 #else // INCLUDE_FPROF
2940       jio_fprintf(defaultStream::error_stream(),
2941         "Flat profiling is not supported in this VM.\n");
2942       return JNI_ERR;
2943 #endif // INCLUDE_FPROF
2944     // -Xconcurrentio
2945     } else if (match_option(option, "-Xconcurrentio", &tail)) {
2946       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2947       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2948       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2949       FLAG_SET_CMDLINE(bool, UseTLAB, false);
2950       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
2951 
2952       // -Xinternalversion
2953     } else if (match_option(option, "-Xinternalversion", &tail)) {
2954       jio_fprintf(defaultStream::output_stream(), "%s\n",
2955                   VM_Version::internal_vm_info_string());
2956       vm_exit(0);
2957 #ifndef PRODUCT
2958     // -Xprintflags
2959     } else if (match_option(option, "-Xprintflags", &tail)) {
2960       CommandLineFlags::printFlags(tty, false);
2961       vm_exit(0);
2962 #endif
2963     // -D
2964     } else if (match_option(option, "-D", &tail)) {
2965       if (CheckEndorsedAndExtDirs) {
2966         if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
2967           // abort if -Djava.endorsed.dirs is set
2968           jio_fprintf(defaultStream::output_stream(),
2969             "-Djava.endorsed.dirs will not be supported in a future release.\n"
2970             "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
2971           return JNI_EINVAL;
2972         }
2973         if (match_option(option, "-Djava.ext.dirs=", &tail)) {
2974           // abort if -Djava.ext.dirs is set
2975           jio_fprintf(defaultStream::output_stream(),
2976             "-Djava.ext.dirs will not be supported in a future release.\n"
2977             "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
2978           return JNI_EINVAL;
2979         }
2980       }
2981 
2982       if (!add_property(tail)) {
2983         return JNI_ENOMEM;
2984       }
2985       // Out of the box management support
2986       if (match_option(option, "-Dcom.sun.management", &tail)) {
2987 #if INCLUDE_MANAGEMENT
2988         FLAG_SET_CMDLINE(bool, ManagementServer, true);
2989 #else
2990         jio_fprintf(defaultStream::output_stream(),
2991           "-Dcom.sun.management is not supported in this VM.\n");
2992         return JNI_ERR;
2993 #endif
2994       }
2995     // -Xint
2996     } else if (match_option(option, "-Xint", &tail)) {
2997           set_mode_flags(_int);
2998     // -Xmixed
2999     } else if (match_option(option, "-Xmixed", &tail)) {
3000           set_mode_flags(_mixed);
3001     // -Xcomp
3002     } else if (match_option(option, "-Xcomp", &tail)) {
3003       // for testing the compiler; turn off all flags that inhibit compilation
3004           set_mode_flags(_comp);
3005     // -Xshare:dump
3006     } else if (match_option(option, "-Xshare:dump", &tail)) {
3007       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3008       set_mode_flags(_int);     // Prevent compilation, which creates objects
3009     // -Xshare:on
3010     } else if (match_option(option, "-Xshare:on", &tail)) {
3011       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3012       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3013     // -Xshare:auto
3014     } else if (match_option(option, "-Xshare:auto", &tail)) {
3015       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3016       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3017     // -Xshare:off
3018     } else if (match_option(option, "-Xshare:off", &tail)) {
3019       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3020       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3021     // -Xverify
3022     } else if (match_option(option, "-Xverify", &tail)) {
3023       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3024         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3025         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3026       } else if (strcmp(tail, ":remote") == 0) {
3027         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3028         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3029       } else if (strcmp(tail, ":none") == 0) {
3030         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3031         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3032       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3033         return JNI_EINVAL;
3034       }
3035     // -Xdebug
3036     } else if (match_option(option, "-Xdebug", &tail)) {
3037       // note this flag has been used, then ignore
3038       set_xdebug_mode(true);
3039     // -Xnoagent
3040     } else if (match_option(option, "-Xnoagent", &tail)) {
3041       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3042     } else if (match_option(option, "-Xboundthreads", &tail)) {
3043       // Bind user level threads to kernel threads (Solaris only)
3044       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3045     } else if (match_option(option, "-Xloggc:", &tail)) {
3046       // Redirect GC output to the file. -Xloggc:<filename>
3047       // ostream_init_log(), when called will use this filename
3048       // to initialize a fileStream.
3049       _gc_log_filename = strdup(tail);
3050      if (!is_filename_valid(_gc_log_filename)) {
3051        jio_fprintf(defaultStream::output_stream(),
3052                   "Invalid file name for use with -Xloggc: Filename can only contain the "
3053                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3054                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
3055         return JNI_EINVAL;
3056       }
3057       FLAG_SET_CMDLINE(bool, PrintGC, true);
3058       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3059 
3060     // JNI hooks
3061     } else if (match_option(option, "-Xcheck", &tail)) {
3062       if (!strcmp(tail, ":jni")) {
3063 #if !INCLUDE_JNI_CHECK
3064         warning("JNI CHECKING is not supported in this VM");
3065 #else
3066         CheckJNICalls = true;
3067 #endif // INCLUDE_JNI_CHECK
3068       } else if (is_bad_option(option, args->ignoreUnrecognized,
3069                                      "check")) {
3070         return JNI_EINVAL;
3071       }
3072     } else if (match_option(option, "vfprintf", &tail)) {
3073       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3074     } else if (match_option(option, "exit", &tail)) {
3075       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3076     } else if (match_option(option, "abort", &tail)) {
3077       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3078     // -XX:+AggressiveHeap
3079     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3080 
3081       // This option inspects the machine and attempts to set various
3082       // parameters to be optimal for long-running, memory allocation
3083       // intensive jobs.  It is intended for machines with large
3084       // amounts of cpu and memory.
3085 
3086       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3087       // VM, but we may not be able to represent the total physical memory
3088       // available (like having 8gb of memory on a box but using a 32bit VM).
3089       // Thus, we need to make sure we're using a julong for intermediate
3090       // calculations.
3091       julong initHeapSize;
3092       julong total_memory = os::physical_memory();
3093 
3094       if (total_memory < (julong)256*M) {
3095         jio_fprintf(defaultStream::error_stream(),
3096                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3097         vm_exit(1);
3098       }
3099 
3100       // The heap size is half of available memory, or (at most)
3101       // all of possible memory less 160mb (leaving room for the OS
3102       // when using ISM).  This is the maximum; because adaptive sizing
3103       // is turned on below, the actual space used may be smaller.
3104 
3105       initHeapSize = MIN2(total_memory / (julong)2,
3106                           total_memory - (julong)160*M);
3107 
3108       initHeapSize = limit_by_allocatable_memory(initHeapSize);
3109 
3110       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3111          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3112          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3113          // Currently the minimum size and the initial heap sizes are the same.
3114          set_min_heap_size(initHeapSize);
3115       }
3116       if (FLAG_IS_DEFAULT(NewSize)) {
3117          // Make the young generation 3/8ths of the total heap.
3118          FLAG_SET_CMDLINE(uintx, NewSize,
3119                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3120          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3121       }
3122 
3123 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3124       FLAG_SET_DEFAULT(UseLargePages, true);
3125 #endif
3126 
3127       // Increase some data structure sizes for efficiency
3128       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3129       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3130       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3131 
3132       // See the OldPLABSize comment below, but replace 'after promotion'
3133       // with 'after copying'.  YoungPLABSize is the size of the survivor
3134       // space per-gc-thread buffers.  The default is 4kw.
3135       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
3136 
3137       // OldPLABSize is the size of the buffers in the old gen that
3138       // UseParallelGC uses to promote live data that doesn't fit in the
3139       // survivor spaces.  At any given time, there's one for each gc thread.
3140       // The default size is 1kw. These buffers are rarely used, since the
3141       // survivor spaces are usually big enough.  For specjbb, however, there
3142       // are occasions when there's lots of live data in the young gen
3143       // and we end up promoting some of it.  We don't have a definite
3144       // explanation for why bumping OldPLABSize helps, but the theory
3145       // is that a bigger PLAB results in retaining something like the
3146       // original allocation order after promotion, which improves mutator
3147       // locality.  A minor effect may be that larger PLABs reduce the
3148       // number of PLAB allocation events during gc.  The value of 8kw
3149       // was arrived at by experimenting with specjbb.
3150       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
3151 
3152       // Enable parallel GC and adaptive generation sizing
3153       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3154       FLAG_SET_DEFAULT(ParallelGCThreads,
3155                        Abstract_VM_Version::parallel_worker_threads());
3156 
3157       // Encourage steady state memory management
3158       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3159 
3160       // This appears to improve mutator locality
3161       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3162 
3163       // Get around early Solaris scheduling bug
3164       // (affinity vs other jobs on system)
3165       // but disallow DR and offlining (5008695).
3166       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3167 
3168     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3169       // The last option must always win.
3170       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3171       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3172     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3173       // The last option must always win.
3174       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3175       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3176     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3177                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3178       jio_fprintf(defaultStream::error_stream(),
3179         "Please use CMSClassUnloadingEnabled in place of "
3180         "CMSPermGenSweepingEnabled in the future\n");
3181     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3182       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3183       jio_fprintf(defaultStream::error_stream(),
3184         "Please use -XX:+UseGCOverheadLimit in place of "
3185         "-XX:+UseGCTimeLimit in the future\n");
3186     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3187       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3188       jio_fprintf(defaultStream::error_stream(),
3189         "Please use -XX:-UseGCOverheadLimit in place of "
3190         "-XX:-UseGCTimeLimit in the future\n");
3191     // The TLE options are for compatibility with 1.3 and will be
3192     // removed without notice in a future release.  These options
3193     // are not to be documented.
3194     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3195       // No longer used.
3196     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3197       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3198     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3199       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3200     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3201       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3202     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3203       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3204     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3205       // No longer used.
3206     } else if (match_option(option, "-XX:TLESize=", &tail)) {
3207       julong long_tlab_size = 0;
3208       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3209       if (errcode != arg_in_range) {
3210         jio_fprintf(defaultStream::error_stream(),
3211                     "Invalid TLAB size: %s\n", option->optionString);
3212         describe_range_error(errcode);
3213         return JNI_EINVAL;
3214       }
3215       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3216     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3217       // No longer used.
3218     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3219       FLAG_SET_CMDLINE(bool, UseTLAB, true);
3220     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3221       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3222     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3223       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3224       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3225     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3226       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3227       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3228     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3229 #if defined(DTRACE_ENABLED)
3230       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3231       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3232       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3233       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3234 #else // defined(DTRACE_ENABLED)
3235       jio_fprintf(defaultStream::error_stream(),
3236                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3237       return JNI_EINVAL;
3238 #endif // defined(DTRACE_ENABLED)
3239 #ifdef ASSERT
3240     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3241       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3242       // disable scavenge before parallel mark-compact
3243       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3244 #endif
3245     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3246       julong cms_blocks_to_claim = (julong)atol(tail);
3247       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3248       jio_fprintf(defaultStream::error_stream(),
3249         "Please use -XX:OldPLABSize in place of "
3250         "-XX:CMSParPromoteBlocksToClaim in the future\n");
3251     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3252       julong cms_blocks_to_claim = (julong)atol(tail);
3253       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3254       jio_fprintf(defaultStream::error_stream(),
3255         "Please use -XX:OldPLABSize in place of "
3256         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3257     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3258       julong old_plab_size = 0;
3259       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3260       if (errcode != arg_in_range) {
3261         jio_fprintf(defaultStream::error_stream(),
3262                     "Invalid old PLAB size: %s\n", option->optionString);
3263         describe_range_error(errcode);
3264         return JNI_EINVAL;
3265       }
3266       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3267       jio_fprintf(defaultStream::error_stream(),
3268                   "Please use -XX:OldPLABSize in place of "
3269                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3270     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3271       julong young_plab_size = 0;
3272       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3273       if (errcode != arg_in_range) {
3274         jio_fprintf(defaultStream::error_stream(),
3275                     "Invalid young PLAB size: %s\n", option->optionString);
3276         describe_range_error(errcode);
3277         return JNI_EINVAL;
3278       }
3279       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3280       jio_fprintf(defaultStream::error_stream(),
3281                   "Please use -XX:YoungPLABSize in place of "
3282                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3283     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3284                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3285       julong stack_size = 0;
3286       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3287       if (errcode != arg_in_range) {
3288         jio_fprintf(defaultStream::error_stream(),
3289                     "Invalid mark stack size: %s\n", option->optionString);
3290         describe_range_error(errcode);
3291         return JNI_EINVAL;
3292       }
3293       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3294     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3295       julong max_stack_size = 0;
3296       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3297       if (errcode != arg_in_range) {
3298         jio_fprintf(defaultStream::error_stream(),
3299                     "Invalid maximum mark stack size: %s\n",
3300                     option->optionString);
3301         describe_range_error(errcode);
3302         return JNI_EINVAL;
3303       }
3304       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3305     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3306                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3307       uintx conc_threads = 0;
3308       if (!parse_uintx(tail, &conc_threads, 1)) {
3309         jio_fprintf(defaultStream::error_stream(),
3310                     "Invalid concurrent threads: %s\n", option->optionString);
3311         return JNI_EINVAL;
3312       }
3313       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3314     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3315       julong max_direct_memory_size = 0;
3316       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3317       if (errcode != arg_in_range) {
3318         jio_fprintf(defaultStream::error_stream(),
3319                     "Invalid maximum direct memory size: %s\n",
3320                     option->optionString);
3321         describe_range_error(errcode);
3322         return JNI_EINVAL;
3323       }
3324       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3325     } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3326       // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3327       //       away and will cause VM initialization failures!
3328       warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3329       FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3330 #if !INCLUDE_MANAGEMENT
3331     } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3332         jio_fprintf(defaultStream::error_stream(),
3333           "ManagementServer is not supported in this VM.\n");
3334         return JNI_ERR;
3335 #endif // INCLUDE_MANAGEMENT
3336     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3337       // Skip -XX:Flags= since that case has already been handled
3338       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3339         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3340           return JNI_EINVAL;
3341         }
3342       }
3343     // Unknown option
3344     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3345       return JNI_ERR;
3346     }
3347   }
3348 
3349   // PrintSharedArchiveAndExit will turn on
3350   //   -Xshare:on
3351   //   -XX:+TraceClassPaths
3352   if (PrintSharedArchiveAndExit) {
3353     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3354     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3355     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3356   }
3357 
3358   // Change the default value for flags  which have different default values
3359   // when working with older JDKs.
3360 #ifdef LINUX
3361  if (JDK_Version::current().compare_major(6) <= 0 &&
3362       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3363     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3364   }
3365 #endif // LINUX
3366   fix_appclasspath();
3367   return JNI_OK;
3368 }
3369 
3370 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3371 //
3372 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3373 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3374 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3375 // path is treated as the current directory.
3376 //
3377 // This causes problems with CDS, which requires that all directories specified in the classpath
3378 // must be empty. In most cases, applications do NOT want to load classes from the current
3379 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3380 // scripts compatible with CDS.
3381 void Arguments::fix_appclasspath() {
3382   if (IgnoreEmptyClassPaths) {
3383     const char separator = *os::path_separator();
3384     const char* src = _java_class_path->value();
3385 
3386     // skip over all the leading empty paths
3387     while (*src == separator) {
3388       src ++;
3389     }
3390 
3391     char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3392     strncpy(copy, src, strlen(src) + 1);
3393 
3394     // trim all trailing empty paths
3395     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3396       *tail = '\0';
3397     }
3398 
3399     char from[3] = {separator, separator, '\0'};
3400     char to  [2] = {separator, '\0'};
3401     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3402       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3403       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3404     }
3405 
3406     _java_class_path->set_value(copy);
3407     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3408   }
3409 
3410   if (!PrintSharedArchiveAndExit) {
3411     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3412   }
3413 }
3414 
3415 static bool has_jar_files(const char* directory) {
3416   DIR* dir = os::opendir(directory);
3417   if (dir == NULL) return false;
3418 
3419   struct dirent *entry;
3420   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3421   bool hasJarFile = false;
3422   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3423     const char* name = entry->d_name;
3424     const char* ext = name + strlen(name) - 4;
3425     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3426   }
3427   FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3428   os::closedir(dir);
3429   return hasJarFile ;
3430 }
3431 
3432 // returns the number of directories in the given path containing JAR files
3433 // If the skip argument is not NULL, it will skip that directory
3434 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3435   const char separator = *os::path_separator();
3436   const char* const end = path + strlen(path);
3437   int nonEmptyDirs = 0;
3438   while (path < end) {
3439     const char* tmp_end = strchr(path, separator);
3440     if (tmp_end == NULL) {
3441       if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3442         nonEmptyDirs++;
3443         jio_fprintf(defaultStream::output_stream(),
3444           "Non-empty %s directory: %s\n", type, path);
3445       }
3446       path = end;
3447     } else {
3448       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3449       memcpy(dirpath, path, tmp_end - path);
3450       dirpath[tmp_end - path] = '\0';
3451       if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3452         nonEmptyDirs++;
3453         jio_fprintf(defaultStream::output_stream(),
3454           "Non-empty %s directory: %s\n", type, dirpath);
3455       }
3456       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3457       path = tmp_end + 1;
3458     }
3459   }
3460   return nonEmptyDirs;
3461 }
3462 
3463 // Returns true if endorsed standards override mechanism and extension mechanism
3464 // are not used.
3465 static bool check_endorsed_and_ext_dirs() {
3466   if (!CheckEndorsedAndExtDirs)
3467     return true;
3468 
3469   char endorsedDir[JVM_MAXPATHLEN];
3470   char extDir[JVM_MAXPATHLEN];
3471   const char* fileSep = os::file_separator();
3472   jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3473                Arguments::get_java_home(), fileSep, fileSep);
3474   jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3475                Arguments::get_java_home(), fileSep, fileSep);
3476 
3477   // check endorsed directory
3478   int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3479 
3480   // check the extension directories but skip the default lib/ext directory
3481   nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3482 
3483   // List of JAR files installed in the default lib/ext directory.
3484   // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3485   static const char* jdk_ext_jars[] = {
3486       "access-bridge-32.jar",
3487       "access-bridge-64.jar",
3488       "access-bridge.jar",
3489       "cldrdata.jar",
3490       "dnsns.jar",
3491       "jaccess.jar",
3492       "jfxrt.jar",
3493       "localedata.jar",
3494       "nashorn.jar",
3495       "sunec.jar",
3496       "sunjce_provider.jar",
3497       "sunmscapi.jar",
3498       "sunpkcs11.jar",
3499       "ucrypto.jar",
3500       "zipfs.jar",
3501       NULL
3502   };
3503 
3504   // check if the default lib/ext directory has any non-JDK jar files; if so, error
3505   DIR* dir = os::opendir(extDir);
3506   if (dir != NULL) {
3507     int num_ext_jars = 0;
3508     struct dirent *entry;
3509     char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
3510     while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3511       const char* name = entry->d_name;
3512       const char* ext = name + strlen(name) - 4;
3513       if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3514         bool is_jdk_jar = false;
3515         const char* jarfile = NULL;
3516         for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3517           if (os::file_name_strcmp(name, jarfile) == 0) {
3518             is_jdk_jar = true;
3519             break;
3520           }
3521         }
3522         if (!is_jdk_jar) {
3523           jio_fprintf(defaultStream::output_stream(),
3524             "%s installed in <JAVA_HOME>/lib/ext\n", name);
3525           num_ext_jars++;
3526         }
3527       }
3528     }
3529     FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3530     os::closedir(dir);
3531     if (num_ext_jars > 0) {
3532       nonEmptyDirs += 1;
3533     }
3534   }
3535 
3536   // check if the default lib/endorsed directory exists; if so, error
3537   dir = os::opendir(endorsedDir);
3538   if (dir != NULL) {
3539     jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3540     os::closedir(dir);
3541     nonEmptyDirs += 1;
3542   }
3543 
3544   if (nonEmptyDirs > 0) {
3545     jio_fprintf(defaultStream::output_stream(),
3546       "Endorsed standards override mechanism and extension mechanism "
3547       "will not be supported in a future release.\n"
3548       "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3549     return false;
3550   }
3551 
3552   return true;
3553 }
3554 
3555 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3556   // This must be done after all -D arguments have been processed.
3557   scp_p->expand_endorsed();
3558 
3559   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3560     // Assemble the bootclasspath elements into the final path.
3561     Arguments::set_sysclasspath(scp_p->combined_path());
3562   }
3563 
3564   if (!check_endorsed_and_ext_dirs()) {
3565     return JNI_ERR;
3566   }
3567 
3568   // This must be done after all arguments have been processed.
3569   // java_compiler() true means set to "NONE" or empty.
3570   if (java_compiler() && !xdebug_mode()) {
3571     // For backwards compatibility, we switch to interpreted mode if
3572     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3573     // not specified.
3574     set_mode_flags(_int);
3575   }
3576   if (CompileThreshold == 0) {
3577     set_mode_flags(_int);
3578   }
3579 
3580   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3581   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3582     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3583   }
3584 
3585 #ifndef COMPILER2
3586   // Don't degrade server performance for footprint
3587   if (FLAG_IS_DEFAULT(UseLargePages) &&
3588       MaxHeapSize < LargePageHeapSizeThreshold) {
3589     // No need for large granularity pages w/small heaps.
3590     // Note that large pages are enabled/disabled for both the
3591     // Java heap and the code cache.
3592     FLAG_SET_DEFAULT(UseLargePages, false);
3593   }
3594 
3595 #else
3596   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3597     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3598   }
3599 #endif
3600 
3601 #ifndef TIERED
3602   // Tiered compilation is undefined.
3603   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3604 #endif
3605 
3606   // If we are running in a headless jre, force java.awt.headless property
3607   // to be true unless the property has already been set.
3608   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3609   if (os::is_headless_jre()) {
3610     const char* headless = Arguments::get_property("java.awt.headless");
3611     if (headless == NULL) {
3612       char envbuffer[128];
3613       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3614         if (!add_property("java.awt.headless=true")) {
3615           return JNI_ENOMEM;
3616         }
3617       } else {
3618         char buffer[256];
3619         strcpy(buffer, "java.awt.headless=");
3620         strcat(buffer, envbuffer);
3621         if (!add_property(buffer)) {
3622           return JNI_ENOMEM;
3623         }
3624       }
3625     }
3626   }
3627 
3628   if (!check_vm_args_consistency()) {
3629     return JNI_ERR;
3630   }
3631 
3632   return JNI_OK;
3633 }
3634 
3635 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3636   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3637                                             scp_assembly_required_p);
3638 }
3639 
3640 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3641   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3642                                             scp_assembly_required_p);
3643 }
3644 
3645 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3646   const int N_MAX_OPTIONS = 64;
3647   const int OPTION_BUFFER_SIZE = 1024;
3648   char buffer[OPTION_BUFFER_SIZE];
3649 
3650   // The variable will be ignored if it exceeds the length of the buffer.
3651   // Don't check this variable if user has special privileges
3652   // (e.g. unix su command).
3653   if (os::getenv(name, buffer, sizeof(buffer)) &&
3654       !os::have_special_privileges()) {
3655     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3656     jio_fprintf(defaultStream::error_stream(),
3657                 "Picked up %s: %s\n", name, buffer);
3658     char* rd = buffer;                        // pointer to the input string (rd)
3659     int i;
3660     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3661       while (isspace(*rd)) rd++;              // skip whitespace
3662       if (*rd == 0) break;                    // we re done when the input string is read completely
3663 
3664       // The output, option string, overwrites the input string.
3665       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3666       // input string (rd).
3667       char* wrt = rd;
3668 
3669       options[i++].optionString = wrt;        // Fill in option
3670       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3671         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3672           int quote = *rd;                    // matching quote to look for
3673           rd++;                               // don't copy open quote
3674           while (*rd != quote) {              // include everything (even spaces) up until quote
3675             if (*rd == 0) {                   // string termination means unmatched string
3676               jio_fprintf(defaultStream::error_stream(),
3677                           "Unmatched quote in %s\n", name);
3678               return JNI_ERR;
3679             }
3680             *wrt++ = *rd++;                   // copy to option string
3681           }
3682           rd++;                               // don't copy close quote
3683         } else {
3684           *wrt++ = *rd++;                     // copy to option string
3685         }
3686       }
3687       // Need to check if we're done before writing a NULL,
3688       // because the write could be to the byte that rd is pointing to.
3689       if (*rd++ == 0) {
3690         *wrt = 0;
3691         break;
3692       }
3693       *wrt = 0;                               // Zero terminate option
3694     }
3695     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3696     JavaVMInitArgs vm_args;
3697     vm_args.version = JNI_VERSION_1_2;
3698     vm_args.options = options;
3699     vm_args.nOptions = i;
3700     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3701 
3702     if (PrintVMOptions) {
3703       const char* tail;
3704       for (int i = 0; i < vm_args.nOptions; i++) {
3705         const JavaVMOption *option = vm_args.options + i;
3706         if (match_option(option, "-XX:", &tail)) {
3707           logOption(tail);
3708         }
3709       }
3710     }
3711 
3712     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3713   }
3714   return JNI_OK;
3715 }
3716 
3717 void Arguments::set_shared_spaces_flags() {
3718   if (DumpSharedSpaces) {
3719     if (RequireSharedSpaces) {
3720       warning("cannot dump shared archive while using shared archive");
3721     }
3722     UseSharedSpaces = false;
3723 #ifdef _LP64
3724     if (!UseCompressedOops || !UseCompressedClassPointers) {
3725       vm_exit_during_initialization(
3726         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3727     }
3728   } else {
3729     if (!UseCompressedOops || !UseCompressedClassPointers) {
3730       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3731     }
3732 #endif
3733   }
3734 }
3735 
3736 #if !INCLUDE_ALL_GCS
3737 static void force_serial_gc() {
3738   FLAG_SET_DEFAULT(UseSerialGC, true);
3739   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
3740   UNSUPPORTED_GC_OPTION(UseG1GC);
3741   UNSUPPORTED_GC_OPTION(UseParallelGC);
3742   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3743   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3744   UNSUPPORTED_GC_OPTION(UseParNewGC);
3745 }
3746 #endif // INCLUDE_ALL_GCS
3747 
3748 // Sharing support
3749 // Construct the path to the archive
3750 static char* get_shared_archive_path() {
3751   char *shared_archive_path;
3752   if (SharedArchiveFile == NULL) {
3753     char jvm_path[JVM_MAXPATHLEN];
3754     os::jvm_path(jvm_path, sizeof(jvm_path));
3755     char *end = strrchr(jvm_path, *os::file_separator());
3756     if (end != NULL) *end = '\0';
3757     size_t jvm_path_len = strlen(jvm_path);
3758     size_t file_sep_len = strlen(os::file_separator());
3759     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3760         file_sep_len + 20, mtInternal);
3761     if (shared_archive_path != NULL) {
3762       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3763       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3764       strncat(shared_archive_path, "classes.jsa", 11);
3765     }
3766   } else {
3767     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3768     if (shared_archive_path != NULL) {
3769       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3770     }
3771   }
3772   return shared_archive_path;
3773 }
3774 
3775 #ifndef PRODUCT
3776 // Determine whether LogVMOutput should be implicitly turned on.
3777 static bool use_vm_log() {
3778   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3779       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3780       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3781       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3782       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3783     return true;
3784   }
3785 
3786 #ifdef COMPILER1
3787   if (PrintC1Statistics) {
3788     return true;
3789   }
3790 #endif // COMPILER1
3791 
3792 #ifdef COMPILER2
3793   if (PrintOptoAssembly || PrintOptoStatistics) {
3794     return true;
3795   }
3796 #endif // COMPILER2
3797 
3798   return false;
3799 }
3800 #endif // PRODUCT
3801 
3802 // Parse entry point called from JNI_CreateJavaVM
3803 
3804 jint Arguments::parse(const JavaVMInitArgs* args) {
3805 
3806   // Remaining part of option string
3807   const char* tail;
3808 
3809   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3810   const char* hotspotrc = ".hotspotrc";
3811   bool settings_file_specified = false;
3812   bool needs_hotspotrc_warning = false;
3813 
3814   ArgumentsExt::process_options(args);
3815 
3816   const char* flags_file;
3817   int index;
3818   for (index = 0; index < args->nOptions; index++) {
3819     const JavaVMOption *option = args->options + index;
3820     if (match_option(option, "-XX:Flags=", &tail)) {
3821       flags_file = tail;
3822       settings_file_specified = true;
3823     }
3824     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3825       PrintVMOptions = true;
3826     }
3827     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3828       PrintVMOptions = false;
3829     }
3830     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3831       IgnoreUnrecognizedVMOptions = true;
3832     }
3833     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3834       IgnoreUnrecognizedVMOptions = false;
3835     }
3836     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3837       CommandLineFlags::printFlags(tty, false);
3838       vm_exit(0);
3839     }
3840 #if INCLUDE_NMT
3841     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3842       // The launcher did not setup nmt environment variable properly.
3843       if (!MemTracker::check_launcher_nmt_support(tail)) {
3844         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3845       }
3846 
3847       // Verify if nmt option is valid.
3848       if (MemTracker::verify_nmt_option()) {
3849         // Late initialization, still in single-threaded mode.
3850         if (MemTracker::tracking_level() >= NMT_summary) {
3851           MemTracker::init();
3852         }
3853       } else {
3854         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3855       }
3856     }
3857 #endif
3858 
3859 
3860 #ifndef PRODUCT
3861     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3862       CommandLineFlags::printFlags(tty, true);
3863       vm_exit(0);
3864     }
3865 #endif
3866   }
3867 
3868   if (IgnoreUnrecognizedVMOptions) {
3869     // uncast const to modify the flag args->ignoreUnrecognized
3870     *(jboolean*)(&args->ignoreUnrecognized) = true;
3871   }
3872 
3873   // Parse specified settings file
3874   if (settings_file_specified) {
3875     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3876       return JNI_EINVAL;
3877     }
3878   } else {
3879 #ifdef ASSERT
3880     // Parse default .hotspotrc settings file
3881     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3882       return JNI_EINVAL;
3883     }
3884 #else
3885     struct stat buf;
3886     if (os::stat(hotspotrc, &buf) == 0) {
3887       needs_hotspotrc_warning = true;
3888     }
3889 #endif
3890   }
3891 
3892   if (PrintVMOptions) {
3893     for (index = 0; index < args->nOptions; index++) {
3894       const JavaVMOption *option = args->options + index;
3895       if (match_option(option, "-XX:", &tail)) {
3896         logOption(tail);
3897       }
3898     }
3899   }
3900 
3901   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3902   jint result = parse_vm_init_args(args);
3903   if (result != JNI_OK) {
3904     return result;
3905   }
3906 
3907   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3908   SharedArchivePath = get_shared_archive_path();
3909   if (SharedArchivePath == NULL) {
3910     return JNI_ENOMEM;
3911   }
3912 
3913   // Set up VerifySharedSpaces
3914   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3915     VerifySharedSpaces = true;
3916   }
3917 
3918   // Delay warning until here so that we've had a chance to process
3919   // the -XX:-PrintWarnings flag
3920   if (needs_hotspotrc_warning) {
3921     warning("%s file is present but has been ignored.  "
3922             "Run with -XX:Flags=%s to load the file.",
3923             hotspotrc, hotspotrc);
3924   }
3925 
3926 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
3927   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3928 #endif
3929 
3930 #if INCLUDE_ALL_GCS
3931   #if (defined JAVASE_EMBEDDED || defined ARM)
3932     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3933   #endif
3934 #endif
3935 
3936 #ifndef PRODUCT
3937   if (TraceBytecodesAt != 0) {
3938     TraceBytecodes = true;
3939   }
3940   if (CountCompiledCalls) {
3941     if (UseCounterDecay) {
3942       warning("UseCounterDecay disabled because CountCalls is set");
3943       UseCounterDecay = false;
3944     }
3945   }
3946 #endif // PRODUCT
3947 
3948   // JSR 292 is not supported before 1.7
3949   if (!JDK_Version::is_gte_jdk17x_version()) {
3950     if (EnableInvokeDynamic) {
3951       if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3952         warning("JSR 292 is not supported before 1.7.  Disabling support.");
3953       }
3954       EnableInvokeDynamic = false;
3955     }
3956   }
3957 
3958   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3959     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3960       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3961     }
3962     ScavengeRootsInCode = 1;
3963   }
3964 
3965   if (PrintGCDetails) {
3966     // Turn on -verbose:gc options as well
3967     PrintGC = true;
3968   }
3969 
3970   if (!JDK_Version::is_gte_jdk18x_version()) {
3971     // To avoid changing the log format for 7 updates this flag is only
3972     // true by default in JDK8 and above.
3973     if (FLAG_IS_DEFAULT(PrintGCCause)) {
3974       FLAG_SET_DEFAULT(PrintGCCause, false);
3975     }
3976   }
3977 
3978   // Set object alignment values.
3979   set_object_alignment();
3980 
3981 #if !INCLUDE_ALL_GCS
3982   force_serial_gc();
3983 #endif // INCLUDE_ALL_GCS
3984 #if !INCLUDE_CDS
3985   if (DumpSharedSpaces || RequireSharedSpaces) {
3986     jio_fprintf(defaultStream::error_stream(),
3987       "Shared spaces are not supported in this VM\n");
3988     return JNI_ERR;
3989   }
3990   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3991     warning("Shared spaces are not supported in this VM");
3992     FLAG_SET_DEFAULT(UseSharedSpaces, false);
3993     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3994   }
3995   no_shared_spaces("CDS Disabled");
3996 #endif // INCLUDE_CDS
3997 
3998   return JNI_OK;
3999 }
4000 
4001 jint Arguments::apply_ergo() {
4002 
4003   // Set flags based on ergonomics.
4004   set_ergonomics_flags();
4005 
4006   set_shared_spaces_flags();
4007 
4008   // Check the GC selections again.
4009   if (!check_gc_consistency()) {
4010     return JNI_EINVAL;
4011   }
4012 
4013   if (TieredCompilation) {
4014     set_tiered_flags();
4015   } else {
4016     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4017     if (CompilationPolicyChoice >= 2) {
4018       vm_exit_during_initialization(
4019         "Incompatible compilation policy selected", NULL);
4020     }
4021   }
4022   // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4023   if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4024     FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4025   }
4026 
4027 
4028   // Set heap size based on available physical memory
4029   set_heap_size();
4030 
4031   ArgumentsExt::set_gc_specific_flags();
4032 
4033   // Initialize Metaspace flags and alignments.
4034   Metaspace::ergo_initialize();
4035 
4036   // Set bytecode rewriting flags
4037   set_bytecode_flags();
4038 
4039   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4040   set_aggressive_opts_flags();
4041 
4042   // Turn off biased locking for locking debug mode flags,
4043   // which are subtlely different from each other but neither works with
4044   // biased locking.
4045   if (UseHeavyMonitors
4046 #ifdef COMPILER1
4047       || !UseFastLocking
4048 #endif // COMPILER1
4049     ) {
4050     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4051       // flag set to true on command line; warn the user that they
4052       // can't enable biased locking here
4053       warning("Biased Locking is not supported with locking debug flags"
4054               "; ignoring UseBiasedLocking flag." );
4055     }
4056     UseBiasedLocking = false;
4057   }
4058 
4059 #ifdef ZERO
4060   // Clear flags not supported on zero.
4061   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4062   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4063   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4064   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4065 #endif // CC_INTERP
4066 
4067 #ifdef COMPILER2
4068   if (!EliminateLocks) {
4069     EliminateNestedLocks = false;
4070   }
4071   if (!Inline) {
4072     IncrementalInline = false;
4073   }
4074 #ifndef PRODUCT
4075   if (!IncrementalInline) {
4076     AlwaysIncrementalInline = false;
4077   }
4078 #endif
4079   if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4080     // incremental inlining: bump MaxNodeLimit
4081     FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4082   }
4083   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4084     // nothing to use the profiling, turn if off
4085     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4086   }
4087 #endif
4088 
4089   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4090     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4091     DebugNonSafepoints = true;
4092   }
4093 
4094   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4095     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4096   }
4097 
4098 #ifndef PRODUCT
4099   if (CompileTheWorld) {
4100     // Force NmethodSweeper to sweep whole CodeCache each time.
4101     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4102       NmethodSweepFraction = 1;
4103     }
4104   }
4105 
4106   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4107     if (use_vm_log()) {
4108       LogVMOutput = true;
4109     }
4110   }
4111 #endif // PRODUCT
4112 
4113   if (PrintCommandLineFlags) {
4114     CommandLineFlags::printSetFlags(tty);
4115   }
4116 
4117   // Apply CPU specific policy for the BiasedLocking
4118   if (UseBiasedLocking) {
4119     if (!VM_Version::use_biased_locking() &&
4120         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4121       UseBiasedLocking = false;
4122     }
4123   }
4124 #ifdef COMPILER2
4125   if (!UseBiasedLocking || EmitSync != 0) {
4126     UseOptoBiasInlining = false;
4127   }
4128 #endif
4129 
4130   // set PauseAtExit if the gamma launcher was used and a debugger is attached
4131   // but only if not already set on the commandline
4132   if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4133     bool set = false;
4134     CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4135     if (!set) {
4136       FLAG_SET_DEFAULT(PauseAtExit, true);
4137     }
4138   }
4139 
4140   return JNI_OK;
4141 }
4142 
4143 jint Arguments::adjust_after_os() {
4144   if (UseNUMA) {
4145     if (UseParallelGC || UseParallelOldGC) {
4146       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4147          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4148       }
4149     }
4150     // UseNUMAInterleaving is set to ON for all collectors and
4151     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4152     // such as the parallel collector for Linux and Solaris will
4153     // interleave old gen and survivor spaces on top of NUMA
4154     // allocation policy for the eden space.
4155     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4156     // all platforms and ParallelGC on Windows will interleave all
4157     // of the heap spaces across NUMA nodes.
4158     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4159       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4160     }
4161   }
4162   return JNI_OK;
4163 }
4164 
4165 int Arguments::PropertyList_count(SystemProperty* pl) {
4166   int count = 0;
4167   while(pl != NULL) {
4168     count++;
4169     pl = pl->next();
4170   }
4171   return count;
4172 }
4173 
4174 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4175   assert(key != NULL, "just checking");
4176   SystemProperty* prop;
4177   for (prop = pl; prop != NULL; prop = prop->next()) {
4178     if (strcmp(key, prop->key()) == 0) return prop->value();
4179   }
4180   return NULL;
4181 }
4182 
4183 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4184   int count = 0;
4185   const char* ret_val = NULL;
4186 
4187   while(pl != NULL) {
4188     if(count >= index) {
4189       ret_val = pl->key();
4190       break;
4191     }
4192     count++;
4193     pl = pl->next();
4194   }
4195 
4196   return ret_val;
4197 }
4198 
4199 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4200   int count = 0;
4201   char* ret_val = NULL;
4202 
4203   while(pl != NULL) {
4204     if(count >= index) {
4205       ret_val = pl->value();
4206       break;
4207     }
4208     count++;
4209     pl = pl->next();
4210   }
4211 
4212   return ret_val;
4213 }
4214 
4215 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4216   SystemProperty* p = *plist;
4217   if (p == NULL) {
4218     *plist = new_p;
4219   } else {
4220     while (p->next() != NULL) {
4221       p = p->next();
4222     }
4223     p->set_next(new_p);
4224   }
4225 }
4226 
4227 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4228   if (plist == NULL)
4229     return;
4230 
4231   SystemProperty* new_p = new SystemProperty(k, v, true);
4232   PropertyList_add(plist, new_p);
4233 }
4234 
4235 // This add maintains unique property key in the list.
4236 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4237   if (plist == NULL)
4238     return;
4239 
4240   // If property key exist then update with new value.
4241   SystemProperty* prop;
4242   for (prop = *plist; prop != NULL; prop = prop->next()) {
4243     if (strcmp(k, prop->key()) == 0) {
4244       if (append) {
4245         prop->append_value(v);
4246       } else {
4247         prop->set_value(v);
4248       }
4249       return;
4250     }
4251   }
4252 
4253   PropertyList_add(plist, k, v);
4254 }
4255 
4256 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4257 // Returns true if all of the source pointed by src has been copied over to
4258 // the destination buffer pointed by buf. Otherwise, returns false.
4259 // Notes:
4260 // 1. If the length (buflen) of the destination buffer excluding the
4261 // NULL terminator character is not long enough for holding the expanded
4262 // pid characters, it also returns false instead of returning the partially
4263 // expanded one.
4264 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4265 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4266                                 char* buf, size_t buflen) {
4267   const char* p = src;
4268   char* b = buf;
4269   const char* src_end = &src[srclen];
4270   char* buf_end = &buf[buflen - 1];
4271 
4272   while (p < src_end && b < buf_end) {
4273     if (*p == '%') {
4274       switch (*(++p)) {
4275       case '%':         // "%%" ==> "%"
4276         *b++ = *p++;
4277         break;
4278       case 'p':  {       //  "%p" ==> current process id
4279         // buf_end points to the character before the last character so
4280         // that we could write '\0' to the end of the buffer.
4281         size_t buf_sz = buf_end - b + 1;
4282         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4283 
4284         // if jio_snprintf fails or the buffer is not long enough to hold
4285         // the expanded pid, returns false.
4286         if (ret < 0 || ret >= (int)buf_sz) {
4287           return false;
4288         } else {
4289           b += ret;
4290           assert(*b == '\0', "fail in copy_expand_pid");
4291           if (p == src_end && b == buf_end + 1) {
4292             // reach the end of the buffer.
4293             return true;
4294           }
4295         }
4296         p++;
4297         break;
4298       }
4299       default :
4300         *b++ = '%';
4301       }
4302     } else {
4303       *b++ = *p++;
4304     }
4305   }
4306   *b = '\0';
4307   return (p == src_end); // return false if not all of the source was copied
4308 }