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