1 /*
   2  * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classLoader.hpp"
  27 #include "classfile/javaAssertions.hpp"
  28 #include "classfile/stringTable.hpp"
  29 #include "classfile/symbolTable.hpp"
  30 #include "compiler/compilerOracle.hpp"
  31 #include "gc/shared/cardTableRS.hpp"
  32 #include "gc/shared/genCollectedHeap.hpp"
  33 #include "gc/shared/referenceProcessor.hpp"
  34 #include "gc/shared/taskqueue.hpp"
  35 #include "memory/allocation.inline.hpp"
  36 #include "memory/universe.inline.hpp"
  37 #include "oops/oop.inline.hpp"
  38 #include "prims/jvmtiExport.hpp"
  39 #include "runtime/arguments.hpp"
  40 #include "runtime/arguments_ext.hpp"
  41 #include "runtime/globals_extension.hpp"
  42 #include "runtime/java.hpp"
  43 #include "runtime/os.hpp"
  44 #include "runtime/vm_version.hpp"
  45 #include "services/management.hpp"
  46 #include "services/memTracker.hpp"
  47 #include "utilities/defaultStream.hpp"
  48 #include "utilities/macros.hpp"
  49 #include "utilities/stringUtils.hpp"
  50 #if INCLUDE_ALL_GCS
  51 #include "gc/cms/compactibleFreeListSpace.hpp"
  52 #include "gc/g1/g1CollectedHeap.inline.hpp"
  53 #include "gc/parallel/parallelScavengeHeap.hpp"
  54 #endif // INCLUDE_ALL_GCS
  55 
  56 // Note: This is a special bug reporting site for the JVM
  57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  58 #define DEFAULT_JAVA_LAUNCHER  "generic"
  59 #define N_MAX_OPTIONS 64
  60 #define OPTION_BUFFER_SIZE 1024
  61 
  62 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  63 do {                                                                  \
  64   if (gc) {                                                           \
  65     if (FLAG_IS_CMDLINE(gc)) {                                        \
  66       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  67     }                                                                 \
  68     FLAG_SET_DEFAULT(gc, false);                                      \
  69   }                                                                   \
  70 } while(0)
  71 
  72 char** Arguments::_jvm_flags_array              = NULL;
  73 int    Arguments::_num_jvm_flags                = 0;
  74 char** Arguments::_jvm_args_array               = NULL;
  75 int    Arguments::_num_jvm_args                 = 0;
  76 char*  Arguments::_java_command                 = NULL;
  77 SystemProperty* Arguments::_system_properties   = NULL;
  78 const char*  Arguments::_gc_log_filename        = NULL;
  79 bool   Arguments::_has_profile                  = false;
  80 size_t Arguments::_conservative_max_heap_alignment = 0;
  81 size_t Arguments::_min_heap_size                = 0;
  82 uintx  Arguments::_min_heap_free_ratio          = 0;
  83 uintx  Arguments::_max_heap_free_ratio          = 0;
  84 Arguments::Mode Arguments::_mode                = _mixed;
  85 bool   Arguments::_java_compiler                = false;
  86 bool   Arguments::_xdebug_mode                  = false;
  87 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
  88 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
  89 int    Arguments::_sun_java_launcher_pid        = -1;
  90 bool   Arguments::_sun_java_launcher_is_altjvm  = false;
  91 
  92 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
  93 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
  94 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
  95 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
  96 bool   Arguments::_ClipInlining                 = ClipInlining;
  97 intx   Arguments::_Tier3InvokeNotifyFreqLog     = Tier3InvokeNotifyFreqLog;
  98 intx   Arguments::_Tier4InvocationThreshold     = Tier4InvocationThreshold;
  99 
 100 char*  Arguments::SharedArchivePath             = NULL;
 101 
 102 AgentLibraryList Arguments::_libraryList;
 103 AgentLibraryList Arguments::_agentList;
 104 
 105 abort_hook_t     Arguments::_abort_hook         = NULL;
 106 exit_hook_t      Arguments::_exit_hook          = NULL;
 107 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 108 
 109 
 110 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 111 SystemProperty *Arguments::_java_library_path = NULL;
 112 SystemProperty *Arguments::_java_home = NULL;
 113 SystemProperty *Arguments::_java_class_path = NULL;
 114 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 115 
 116 char* Arguments::_ext_dirs = NULL;
 117 // change the 0 on next line to 1 to enable argument tracing
 118 #if 0
 119 #define JVM_ARGS_ETRACE(x) x
 120 #else
 121 #define JVM_ARGS_ETRACE(x)
 122 #endif
 123 
 124 // Dump VM Option with a tag
 125 void DumpOption(const JavaVMOption *option_p,
 126                 const int index, const char *tag) {
 127   if (PrintVMOptions && Verbose) {
 128     if (index >= 0) {
 129       jio_fprintf(defaultStream::output_stream(),
 130                   "%s:[%d]='%s'\n", tag, index, option_p->optionString);
 131     }
 132   }
 133 }
 134 
 135 // Dump VM Option with a tag
 136 void DumpVMOption(const JavaVMInitArgs* args_p,
 137                   const int index, const char *tag) {
 138   if (PrintVMOptions && Verbose) {
 139     if (args_p->options != NULL) {
 140       if ((index >= 0) && (index < args_p->nOptions)) {
 141         JavaVMOption *option_p = args_p->options + index;
 142         jio_fprintf(defaultStream::output_stream(),
 143                     "%s:[%d]='%s'\n", tag, index, option_p->optionString);
 144       }
 145     }
 146   }
 147 }
 148 
 149 // Dump VM Options with a tag
 150 void DumpVMOptions(const JavaVMInitArgs* args_p, const char *tag) {
 151   if (PrintVMOptions && Verbose) {
 152     if (args_p->options != NULL) {
 153       for (int index = 0; index < args_p->nOptions; index++) {
 154         JavaVMOption *option_p = args_p->options + index;
 155         jio_fprintf(defaultStream::output_stream(),
 156                     "%s:[%d]='%s'\n", tag, index, option_p->optionString);
 157       }
 158     }
 159   }
 160 }
 161 
 162 // Free memory associated with an options list
 163 void FreeVMOptions(JavaVMInitArgs **args_pp, const JavaVMInitArgs *args_base_p) {
 164   assert(args_pp != NULL, "args_pp must not be NULL");
 165   assert(*args_pp != NULL, "*args_pp must not be NULL");
 166   if (args_base_p == (*args_pp)) {
 167     // Do not free memory we did not allocate
 168     return;
 169   }
 170   assert((*args_pp)->options != NULL, "(*args_pp)->options must not be NULL");
 171   for (int index = 0; index < (*args_pp)->nOptions; index++) {
 172     JavaVMOption *option_p = (*args_pp)->options + index;
 173     if (option_p->optionString != NULL) {
 174       os::free(option_p->optionString);
 175       option_p->optionString = NULL;
 176     }
 177   }
 178   os::free((void *)(*args_pp)->options);
 179   (*args_pp)->options = NULL;
 180   os::free((void *)(*args_pp));
 181   (*args_pp) = NULL;
 182 }
 183 
 184 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
 185 // part of the option string.
 186 static bool match_option(const JavaVMOption *option, const char* name,
 187                          const char** tail) {
 188   int len = (int)strlen(name);
 189   if (strncmp(option->optionString, name, len) == 0) {
 190     *tail = option->optionString + len;
 191     return true;
 192   } else {
 193     return false;
 194   }
 195 }
 196 
 197 // Check if 'option' matches 'name'. No "tail" is allowed.
 198 static bool match_option(const JavaVMOption *option, const char* name) {
 199   const char* tail = NULL;
 200   bool result = match_option(option, name, &tail);
 201   if (tail != NULL && *tail == '\0') {
 202     return result;
 203   } else {
 204     return false;
 205   }
 206 }
 207 
 208 // Return true if any of the strings in null-terminated array 'names' matches.
 209 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
 210 // the option must match exactly.
 211 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
 212   bool tail_allowed) {
 213   for (/* empty */; *names != NULL; ++names) {
 214     if (match_option(option, *names, tail)) {
 215       if (**tail == '\0' || tail_allowed && **tail == ':') {
 216         return true;
 217       }
 218     }
 219   }
 220   return false;
 221 }
 222 
 223 static void logOption(const char* opt) {
 224   if (PrintVMOptions) {
 225     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 226   }
 227 }
 228 
 229 // Process java launcher properties.
 230 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 231   // See if sun.java.launcher, sun.java.launcher.is_altjvm or
 232   // sun.java.launcher.pid is defined.
 233   // Must do this before setting up other system properties,
 234   // as some of them may depend on launcher type.
 235   for (int index = 0; index < args->nOptions; index++) {
 236     const JavaVMOption* option = args->options + index;
 237     const char* tail;
 238 
 239     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 240       process_java_launcher_argument(tail, option->extraInfo);
 241       continue;
 242     }
 243     if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
 244       if (strcmp(tail, "true") == 0) {
 245         _sun_java_launcher_is_altjvm = true;
 246       }
 247       continue;
 248     }
 249     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 250       _sun_java_launcher_pid = atoi(tail);
 251       continue;
 252     }
 253   }
 254 }
 255 
 256 // Initialize system properties key and value.
 257 void Arguments::init_system_properties() {
 258 
 259   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 260                                                                  "Java Virtual Machine Specification",  false));
 261   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 262   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 263   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 264 
 265   // Following are JVMTI agent writable properties.
 266   // Properties values are set to NULL and they are
 267   // os specific they are initialized in os::init_system_properties_values().
 268   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 269   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 270   _java_home =  new SystemProperty("java.home", NULL,  true);
 271   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 272 
 273   _java_class_path = new SystemProperty("java.class.path", "",  true);
 274 
 275   // Add to System Property list.
 276   PropertyList_add(&_system_properties, _sun_boot_library_path);
 277   PropertyList_add(&_system_properties, _java_library_path);
 278   PropertyList_add(&_system_properties, _java_home);
 279   PropertyList_add(&_system_properties, _java_class_path);
 280   PropertyList_add(&_system_properties, _sun_boot_class_path);
 281 
 282   // Set OS specific system properties values
 283   os::init_system_properties_values();
 284 }
 285 
 286 
 287   // Update/Initialize System properties after JDK version number is known
 288 void Arguments::init_version_specific_system_properties() {
 289   enum { bufsz = 16 };
 290   char buffer[bufsz];
 291   const char* spec_vendor = "Sun Microsystems Inc.";
 292   uint32_t spec_version = 0;
 293 
 294   spec_vendor = "Oracle Corporation";
 295   spec_version = JDK_Version::current().major_version();
 296   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 297 
 298   PropertyList_add(&_system_properties,
 299       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 300   PropertyList_add(&_system_properties,
 301       new SystemProperty("java.vm.specification.version", buffer, false));
 302   PropertyList_add(&_system_properties,
 303       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 304 }
 305 
 306 /**
 307  * Provide a slightly more user-friendly way of eliminating -XX flags.
 308  * When a flag is eliminated, it can be added to this list in order to
 309  * continue accepting this flag on the command-line, while issuing a warning
 310  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 311  * limit, we flatly refuse to admit the existence of the flag.  This allows
 312  * a flag to die correctly over JDK releases using HSX.
 313  * But now that HSX is no longer supported only options with a future
 314  * accept_until value need to be listed, and the list can be pruned
 315  * on each major release.
 316  */
 317 typedef struct {
 318   const char* name;
 319   JDK_Version obsoleted_in; // when the flag went away
 320   JDK_Version accept_until; // which version to start denying the existence
 321 } ObsoleteFlag;
 322 
 323 static ObsoleteFlag obsolete_jvm_flags[] = {
 324   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 325   { "SafepointPollOffset",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 326   { "UseBoundThreads",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 327   { "DefaultThreadPriority",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 328   { "NoYieldsInMicrolock",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 329   { "BackEdgeThreshold",             JDK_Version::jdk(9), JDK_Version::jdk(10) },
 330   { "UseNewReflection",              JDK_Version::jdk(9), JDK_Version::jdk(10) },
 331   { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
 332   { "VerifyReflectionBytecodes",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 333   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 334   { "NmethodSweepFraction",          JDK_Version::jdk(9), JDK_Version::jdk(10) },
 335   { "NmethodSweepCheckInterval",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 336   { "CodeCacheMinimumFreeSpace",     JDK_Version::jdk(9), JDK_Version::jdk(10) },
 337 #ifndef ZERO
 338   { "UseFastAccessorMethods",        JDK_Version::jdk(9), JDK_Version::jdk(10) },
 339   { "UseFastEmptyMethods",           JDK_Version::jdk(9), JDK_Version::jdk(10) },
 340 #endif // ZERO
 341   { "UseCompilerSafepoints",         JDK_Version::jdk(9), JDK_Version::jdk(10) },
 342   { "AdaptiveSizePausePolicy",       JDK_Version::jdk(9), JDK_Version::jdk(10) },
 343   { "ParallelGCRetainPLAB",          JDK_Version::jdk(9), JDK_Version::jdk(10) },
 344   { NULL, JDK_Version(0), JDK_Version(0) }
 345 };
 346 
 347 // Returns true if the flag is obsolete and fits into the range specified
 348 // for being ignored.  In the case that the flag is ignored, the 'version'
 349 // value is filled in with the version number when the flag became
 350 // obsolete so that that value can be displayed to the user.
 351 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 352   int i = 0;
 353   assert(version != NULL, "Must provide a version buffer");
 354   while (obsolete_jvm_flags[i].name != NULL) {
 355     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 356     // <flag>=xxx form
 357     // [-|+]<flag> form
 358     size_t len = strlen(flag_status.name);
 359     if ((strncmp(flag_status.name, s, len) == 0) &&
 360         (strlen(s) == len)){
 361       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 362           *version = flag_status.obsoleted_in;
 363           return true;
 364       }
 365     }
 366     i++;
 367   }
 368   return false;
 369 }
 370 
 371 // Constructs the system class path (aka boot class path) from the following
 372 // components, in order:
 373 //
 374 //     prefix           // from -Xbootclasspath/p:...
 375 //     base             // from os::get_system_properties() or -Xbootclasspath=
 376 //     suffix           // from -Xbootclasspath/a:...
 377 //
 378 // This could be AllStatic, but it isn't needed after argument processing is
 379 // complete.
 380 class SysClassPath: public StackObj {
 381 public:
 382   SysClassPath(const char* base);
 383   ~SysClassPath();
 384 
 385   inline void set_base(const char* base);
 386   inline void add_prefix(const char* prefix);
 387   inline void add_suffix_to_prefix(const char* suffix);
 388   inline void add_suffix(const char* suffix);
 389   inline void reset_path(const char* base);
 390 
 391   inline const char* get_base()     const { return _items[_scp_base]; }
 392   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 393   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 394 
 395   // Combine all the components into a single c-heap-allocated string; caller
 396   // must free the string if/when no longer needed.
 397   char* combined_path();
 398 
 399 private:
 400   // Utility routines.
 401   static char* add_to_path(const char* path, const char* str, bool prepend);
 402   static char* add_jars_to_path(char* path, const char* directory);
 403 
 404   inline void reset_item_at(int index);
 405 
 406   // Array indices for the items that make up the sysclasspath.  All except the
 407   // base are allocated in the C heap and freed by this class.
 408   enum {
 409     _scp_prefix,        // from -Xbootclasspath/p:...
 410     _scp_base,          // the default sysclasspath
 411     _scp_suffix,        // from -Xbootclasspath/a:...
 412     _scp_nitems         // the number of items, must be last.
 413   };
 414 
 415   const char* _items[_scp_nitems];
 416 };
 417 
 418 SysClassPath::SysClassPath(const char* base) {
 419   memset(_items, 0, sizeof(_items));
 420   _items[_scp_base] = base;
 421 }
 422 
 423 SysClassPath::~SysClassPath() {
 424   // Free everything except the base.
 425   for (int i = 0; i < _scp_nitems; ++i) {
 426     if (i != _scp_base) reset_item_at(i);
 427   }
 428 }
 429 
 430 inline void SysClassPath::set_base(const char* base) {
 431   _items[_scp_base] = base;
 432 }
 433 
 434 inline void SysClassPath::add_prefix(const char* prefix) {
 435   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 436 }
 437 
 438 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 439   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 440 }
 441 
 442 inline void SysClassPath::add_suffix(const char* suffix) {
 443   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 444 }
 445 
 446 inline void SysClassPath::reset_item_at(int index) {
 447   assert(index < _scp_nitems && index != _scp_base, "just checking");
 448   if (_items[index] != NULL) {
 449     FREE_C_HEAP_ARRAY(char, _items[index]);
 450     _items[index] = NULL;
 451   }
 452 }
 453 
 454 inline void SysClassPath::reset_path(const char* base) {
 455   // Clear the prefix and suffix.
 456   reset_item_at(_scp_prefix);
 457   reset_item_at(_scp_suffix);
 458   set_base(base);
 459 }
 460 
 461 //------------------------------------------------------------------------------
 462 
 463 
 464 // Combine the bootclasspath elements, some of which may be null, into a single
 465 // c-heap-allocated string.
 466 char* SysClassPath::combined_path() {
 467   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 468 
 469   size_t lengths[_scp_nitems];
 470   size_t total_len = 0;
 471 
 472   const char separator = *os::path_separator();
 473 
 474   // Get the lengths.
 475   int i;
 476   for (i = 0; i < _scp_nitems; ++i) {
 477     if (_items[i] != NULL) {
 478       lengths[i] = strlen(_items[i]);
 479       // Include space for the separator char (or a NULL for the last item).
 480       total_len += lengths[i] + 1;
 481     }
 482   }
 483   assert(total_len > 0, "empty sysclasspath not allowed");
 484 
 485   // Copy the _items to a single string.
 486   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 487   char* cp_tmp = cp;
 488   for (i = 0; i < _scp_nitems; ++i) {
 489     if (_items[i] != NULL) {
 490       memcpy(cp_tmp, _items[i], lengths[i]);
 491       cp_tmp += lengths[i];
 492       *cp_tmp++ = separator;
 493     }
 494   }
 495   *--cp_tmp = '\0';     // Replace the extra separator.
 496   return cp;
 497 }
 498 
 499 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 500 char*
 501 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 502   char *cp;
 503 
 504   assert(str != NULL, "just checking");
 505   if (path == NULL) {
 506     size_t len = strlen(str) + 1;
 507     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 508     memcpy(cp, str, len);                       // copy the trailing null
 509   } else {
 510     const char separator = *os::path_separator();
 511     size_t old_len = strlen(path);
 512     size_t str_len = strlen(str);
 513     size_t len = old_len + str_len + 2;
 514 
 515     if (prepend) {
 516       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 517       char* cp_tmp = cp;
 518       memcpy(cp_tmp, str, str_len);
 519       cp_tmp += str_len;
 520       *cp_tmp = separator;
 521       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 522       FREE_C_HEAP_ARRAY(char, path);
 523     } else {
 524       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 525       char* cp_tmp = cp + old_len;
 526       *cp_tmp = separator;
 527       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 528     }
 529   }
 530   return cp;
 531 }
 532 
 533 // Scan the directory and append any jar or zip files found to path.
 534 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 535 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 536   DIR* dir = os::opendir(directory);
 537   if (dir == NULL) return path;
 538 
 539   char dir_sep[2] = { '\0', '\0' };
 540   size_t directory_len = strlen(directory);
 541   const char fileSep = *os::file_separator();
 542   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 543 
 544   /* Scan the directory for jars/zips, appending them to path. */
 545   struct dirent *entry;
 546   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
 547   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
 548     const char* name = entry->d_name;
 549     const char* ext = name + strlen(name) - 4;
 550     bool isJarOrZip = ext > name &&
 551       (os::file_name_strcmp(ext, ".jar") == 0 ||
 552        os::file_name_strcmp(ext, ".zip") == 0);
 553     if (isJarOrZip) {
 554       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
 555       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
 556       path = add_to_path(path, jarpath, false);
 557       FREE_C_HEAP_ARRAY(char, jarpath);
 558     }
 559   }
 560   FREE_C_HEAP_ARRAY(char, dbuf);
 561   os::closedir(dir);
 562   return path;
 563 }
 564 
 565 // Parses a memory size specification string.
 566 static bool atomull(const char *s, julong* result) {
 567   julong n = 0;
 568   int args_read = 0;
 569   bool is_hex = false;
 570   // Skip leading 0[xX] for hexadecimal
 571   if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
 572     s += 2;
 573     is_hex = true;
 574     args_read = sscanf(s, JULONG_FORMAT_X, &n);
 575   } else {
 576     args_read = sscanf(s, JULONG_FORMAT, &n);
 577   }
 578   if (args_read != 1) {
 579     return false;
 580   }
 581   while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
 582     s++;
 583   }
 584   // 4705540: illegal if more characters are found after the first non-digit
 585   if (strlen(s) > 1) {
 586     return false;
 587   }
 588   switch (*s) {
 589     case 'T': case 't':
 590       *result = n * G * K;
 591       // Check for overflow.
 592       if (*result/((julong)G * K) != n) return false;
 593       return true;
 594     case 'G': case 'g':
 595       *result = n * G;
 596       if (*result/G != n) return false;
 597       return true;
 598     case 'M': case 'm':
 599       *result = n * M;
 600       if (*result/M != n) return false;
 601       return true;
 602     case 'K': case 'k':
 603       *result = n * K;
 604       if (*result/K != n) return false;
 605       return true;
 606     case '\0':
 607       *result = n;
 608       return true;
 609     default:
 610       return false;
 611   }
 612 }
 613 
 614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 615   if (size < min_size) return arg_too_small;
 616   // Check that size will fit in a size_t (only relevant on 32-bit)
 617   if (size > max_uintx) return arg_too_big;
 618   return arg_in_range;
 619 }
 620 
 621 // Describe an argument out of range error
 622 void Arguments::describe_range_error(ArgsRange errcode) {
 623   switch(errcode) {
 624   case arg_too_big:
 625     jio_fprintf(defaultStream::error_stream(),
 626                 "The specified size exceeds the maximum "
 627                 "representable size.\n");
 628     break;
 629   case arg_too_small:
 630   case arg_unreadable:
 631   case arg_in_range:
 632     // do nothing for now
 633     break;
 634   default:
 635     ShouldNotReachHere();
 636   }
 637 }
 638 
 639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 640   return CommandLineFlags::boolAtPut(name, &value, origin);
 641 }
 642 
 643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 644   double v;
 645   if (sscanf(value, "%lf", &v) != 1) {
 646     return false;
 647   }
 648 
 649   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 650     return true;
 651   }
 652   return false;
 653 }
 654 
 655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 656   julong v;
 657   int int_v;
 658   intx intx_v;
 659   bool is_neg = false;
 660   // Check the sign first since atomull() parses only unsigned values.
 661   if (*value == '-') {
 662     if (!CommandLineFlags::intxAt(name, &intx_v) && !CommandLineFlags::intAt(name, &int_v)) {
 663       return false;
 664     }
 665     value++;
 666     is_neg = true;
 667   }
 668   if (!atomull(value, &v)) {
 669     return false;
 670   }
 671   int_v = (int) v;
 672   if (is_neg) {
 673     int_v = -int_v;
 674   }
 675   if (CommandLineFlags::intAtPut(name, &int_v, origin)) {
 676     return true;
 677   }
 678   uint uint_v = (uint) v;
 679   if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin)) {
 680     return true;
 681   }
 682   intx_v = (intx) v;
 683   if (is_neg) {
 684     intx_v = -intx_v;
 685   }
 686   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 687     return true;
 688   }
 689   uintx uintx_v = (uintx) v;
 690   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 691     return true;
 692   }
 693   uint64_t uint64_t_v = (uint64_t) v;
 694   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 695     return true;
 696   }
 697   size_t size_t_v = (size_t) v;
 698   if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
 699     return true;
 700   }
 701   return false;
 702 }
 703 
 704 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 705   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 706   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 707   FREE_C_HEAP_ARRAY(char, value);
 708   return true;
 709 }
 710 
 711 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 712   const char* old_value = "";
 713   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 714   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 715   size_t new_len = strlen(new_value);
 716   const char* value;
 717   char* free_this_too = NULL;
 718   if (old_len == 0) {
 719     value = new_value;
 720   } else if (new_len == 0) {
 721     value = old_value;
 722   } else {
 723     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
 724     // each new setting adds another LINE to the switch:
 725     sprintf(buf, "%s\n%s", old_value, new_value);
 726     value = buf;
 727     free_this_too = buf;
 728   }
 729   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 730   // CommandLineFlags always returns a pointer that needs freeing.
 731   FREE_C_HEAP_ARRAY(char, value);
 732   if (free_this_too != NULL) {
 733     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 734     FREE_C_HEAP_ARRAY(char, free_this_too);
 735   }
 736   return true;
 737 }
 738 
 739 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 740 
 741   // range of acceptable characters spelled out for portability reasons
 742 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 743 #define BUFLEN 255
 744   char name[BUFLEN+1];
 745   char dummy;
 746 
 747   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 748     return set_bool_flag(name, false, origin);
 749   }
 750   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 751     return set_bool_flag(name, true, origin);
 752   }
 753 
 754   char punct;
 755   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 756     const char* value = strchr(arg, '=') + 1;
 757     Flag* flag = Flag::find_flag(name, strlen(name));
 758     if (flag != NULL && flag->is_ccstr()) {
 759       if (flag->ccstr_accumulates()) {
 760         return append_to_string_flag(name, value, origin);
 761       } else {
 762         if (value[0] == '\0') {
 763           value = NULL;
 764         }
 765         return set_string_flag(name, value, origin);
 766       }
 767     }
 768   }
 769 
 770   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 771     const char* value = strchr(arg, '=') + 1;
 772     // -XX:Foo:=xxx will reset the string flag to the given value.
 773     if (value[0] == '\0') {
 774       value = NULL;
 775     }
 776     return set_string_flag(name, value, origin);
 777   }
 778 
 779 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 780 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 781 #define        NUMBER_RANGE    "[0123456789]"
 782   char value[BUFLEN + 1];
 783   char value2[BUFLEN + 1];
 784   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 785     // Looks like a floating-point number -- try again with more lenient format string
 786     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 787       return set_fp_numeric_flag(name, value, origin);
 788     }
 789   }
 790 
 791 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
 792   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 793     return set_numeric_flag(name, value, origin);
 794   }
 795 
 796   return false;
 797 }
 798 
 799 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 800   assert(bldarray != NULL, "illegal argument");
 801 
 802   if (arg == NULL) {
 803     return;
 804   }
 805 
 806   int new_count = *count + 1;
 807 
 808   // expand the array and add arg to the last element
 809   if (*bldarray == NULL) {
 810     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 811   } else {
 812     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 813   }
 814   (*bldarray)[*count] = os::strdup_check_oom(arg);
 815   *count = new_count;
 816 }
 817 
 818 void Arguments::build_jvm_args(const char* arg) {
 819   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 820 }
 821 
 822 void Arguments::build_jvm_flags(const char* arg) {
 823   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 824 }
 825 
 826 // utility function to return a string that concatenates all
 827 // strings in a given char** array
 828 const char* Arguments::build_resource_string(char** args, int count) {
 829   if (args == NULL || count == 0) {
 830     return NULL;
 831   }
 832   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
 833   for (int i = 1; i < count; i++) {
 834     length += strlen(args[i]) + 1; // add 1 for a space
 835   }
 836   char* s = NEW_RESOURCE_ARRAY(char, length);
 837   strcpy(s, args[0]);
 838   for (int j = 1; j < count; j++) {
 839     strcat(s, " ");
 840     strcat(s, args[j]);
 841   }
 842   return (const char*) s;
 843 }
 844 
 845 void Arguments::print_on(outputStream* st) {
 846   st->print_cr("VM Arguments:");
 847   if (num_jvm_flags() > 0) {
 848     st->print("jvm_flags: "); print_jvm_flags_on(st);
 849   }
 850   if (num_jvm_args() > 0) {
 851     st->print("jvm_args: "); print_jvm_args_on(st);
 852   }
 853   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 854   if (_java_class_path != NULL) {
 855     char* path = _java_class_path->value();
 856     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 857   }
 858   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 859 }
 860 
 861 void Arguments::print_jvm_flags_on(outputStream* st) {
 862   if (_num_jvm_flags > 0) {
 863     for (int i=0; i < _num_jvm_flags; i++) {
 864       st->print("%s ", _jvm_flags_array[i]);
 865     }
 866     st->cr();
 867   }
 868 }
 869 
 870 void Arguments::print_jvm_args_on(outputStream* st) {
 871   if (_num_jvm_args > 0) {
 872     for (int i=0; i < _num_jvm_args; i++) {
 873       st->print("%s ", _jvm_args_array[i]);
 874     }
 875     st->cr();
 876   }
 877 }
 878 
 879 bool Arguments::process_argument(const char* arg,
 880     jboolean ignore_unrecognized, Flag::Flags origin) {
 881 
 882   JDK_Version since = JDK_Version();
 883 
 884   if (parse_argument(arg, origin) || ignore_unrecognized) {
 885     return true;
 886   }
 887 
 888   // Determine if the flag has '+', '-', or '=' characters.
 889   bool has_plus_minus = (*arg == '+' || *arg == '-');
 890   const char* const argname = has_plus_minus ? arg + 1 : arg;
 891 
 892   size_t arg_len;
 893   const char* equal_sign = strchr(argname, '=');
 894   if (equal_sign == NULL) {
 895     arg_len = strlen(argname);
 896   } else {
 897     arg_len = equal_sign - argname;
 898   }
 899 
 900   // Construct a string which consists only of the argument name without '+', '-', or '='.
 901   char stripped_argname[256];
 902   strncpy(stripped_argname, argname, arg_len);
 903   stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
 904 
 905   if (is_newly_obsolete(stripped_argname, &since)) {
 906     char version[256];
 907     since.to_string(version, sizeof(version));
 908     warning("ignoring option %s; support was removed in %s", stripped_argname, version);
 909     return true;
 910   }
 911 
 912   // For locked flags, report a custom error message if available.
 913   // Otherwise, report the standard unrecognized VM option.
 914   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 915   if (found_flag != NULL) {
 916     char locked_message_buf[BUFLEN];
 917     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 918     if (strlen(locked_message_buf) == 0) {
 919       if (found_flag->is_bool() && !has_plus_minus) {
 920         jio_fprintf(defaultStream::error_stream(),
 921           "Missing +/- setting for VM option '%s'\n", argname);
 922       } else if (!found_flag->is_bool() && has_plus_minus) {
 923         jio_fprintf(defaultStream::error_stream(),
 924           "Unexpected +/- setting in VM option '%s'\n", argname);
 925       } else {
 926         jio_fprintf(defaultStream::error_stream(),
 927           "Improperly specified VM option '%s'\n", argname);
 928       }
 929     } else {
 930       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 931     }
 932   } else {
 933     jio_fprintf(defaultStream::error_stream(),
 934                 "Unrecognized VM option '%s'\n", argname);
 935     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 936     if (fuzzy_matched != NULL) {
 937       jio_fprintf(defaultStream::error_stream(),
 938                   "Did you mean '%s%s%s'? ",
 939                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 940                   fuzzy_matched->_name,
 941                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 942     }
 943   }
 944 
 945   // allow for commandline "commenting out" options like -XX:#+Verbose
 946   return arg[0] == '#';
 947 }
 948 
 949 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 950   FILE* stream = fopen(file_name, "rb");
 951   if (stream == NULL) {
 952     if (should_exist) {
 953       jio_fprintf(defaultStream::error_stream(),
 954                   "Could not open settings file %s\n", file_name);
 955       return false;
 956     } else {
 957       return true;
 958     }
 959   }
 960 
 961   char token[1024];
 962   int  pos = 0;
 963 
 964   bool in_white_space = true;
 965   bool in_comment     = false;
 966   bool in_quote       = false;
 967   char quote_c        = 0;
 968   bool result         = true;
 969 
 970   int c = getc(stream);
 971   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 972     if (in_white_space) {
 973       if (in_comment) {
 974         if (c == '\n') in_comment = false;
 975       } else {
 976         if (c == '#') in_comment = true;
 977         else if (!isspace(c)) {
 978           in_white_space = false;
 979           token[pos++] = c;
 980         }
 981       }
 982     } else {
 983       if (c == '\n' || (!in_quote && isspace(c))) {
 984         // token ends at newline, or at unquoted whitespace
 985         // this allows a way to include spaces in string-valued options
 986         token[pos] = '\0';
 987         logOption(token);
 988         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 989         build_jvm_flags(token);
 990         pos = 0;
 991         in_white_space = true;
 992         in_quote = false;
 993       } else if (!in_quote && (c == '\'' || c == '"')) {
 994         in_quote = true;
 995         quote_c = c;
 996       } else if (in_quote && (c == quote_c)) {
 997         in_quote = false;
 998       } else {
 999         token[pos++] = c;
1000       }
1001     }
1002     c = getc(stream);
1003   }
1004   if (pos > 0) {
1005     token[pos] = '\0';
1006     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1007     build_jvm_flags(token);
1008   }
1009   fclose(stream);
1010   return result;
1011 }
1012 
1013 //=============================================================================================================
1014 // Parsing of properties (-D)
1015 
1016 const char* Arguments::get_property(const char* key) {
1017   return PropertyList_get_value(system_properties(), key);
1018 }
1019 
1020 bool Arguments::add_property(const char* prop) {
1021   const char* eq = strchr(prop, '=');
1022   char* key;
1023   // ns must be static--its address may be stored in a SystemProperty object.
1024   const static char ns[1] = {0};
1025   char* value = (char *)ns;
1026 
1027   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1028   key = AllocateHeap(key_len + 1, mtInternal);
1029   strncpy(key, prop, key_len);
1030   key[key_len] = '\0';
1031 
1032   if (eq != NULL) {
1033     size_t value_len = strlen(prop) - key_len - 1;
1034     value = AllocateHeap(value_len + 1, mtInternal);
1035     strncpy(value, &prop[key_len + 1], value_len + 1);
1036   }
1037 
1038   if (strcmp(key, "java.compiler") == 0) {
1039     process_java_compiler_argument(value);
1040     FreeHeap(key);
1041     if (eq != NULL) {
1042       FreeHeap(value);
1043     }
1044     return true;
1045   } else if (strcmp(key, "sun.java.command") == 0) {
1046     _java_command = value;
1047 
1048     // Record value in Arguments, but let it get passed to Java.
1049   } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1050              strcmp(key, "sun.java.launcher.pid") == 0) {
1051     // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1052     // private and are processed in process_sun_java_launcher_properties();
1053     // the sun.java.launcher property is passed on to the java application
1054     FreeHeap(key);
1055     if (eq != NULL) {
1056       FreeHeap(value);
1057     }
1058     return true;
1059   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1060     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1061     // its value without going through the property list or making a Java call.
1062     _java_vendor_url_bug = value;
1063   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1064     PropertyList_unique_add(&_system_properties, key, value, true);
1065     return true;
1066   }
1067   // Create new property and add at the end of the list
1068   PropertyList_unique_add(&_system_properties, key, value);
1069   return true;
1070 }
1071 
1072 //===========================================================================================================
1073 // Setting int/mixed/comp mode flags
1074 
1075 void Arguments::set_mode_flags(Mode mode) {
1076   // Set up default values for all flags.
1077   // If you add a flag to any of the branches below,
1078   // add a default value for it here.
1079   set_java_compiler(false);
1080   _mode                      = mode;
1081 
1082   // Ensure Agent_OnLoad has the correct initial values.
1083   // This may not be the final mode; mode may change later in onload phase.
1084   PropertyList_unique_add(&_system_properties, "java.vm.info",
1085                           (char*)VM_Version::vm_info_string(), false);
1086 
1087   UseInterpreter             = true;
1088   UseCompiler                = true;
1089   UseLoopCounter             = true;
1090 
1091   // Default values may be platform/compiler dependent -
1092   // use the saved values
1093   ClipInlining               = Arguments::_ClipInlining;
1094   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1095   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1096   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1097   if (TieredCompilation) {
1098     if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1099       Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1100     }
1101     if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1102       Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1103     }
1104   }
1105 
1106   // Change from defaults based on mode
1107   switch (mode) {
1108   default:
1109     ShouldNotReachHere();
1110     break;
1111   case _int:
1112     UseCompiler              = false;
1113     UseLoopCounter           = false;
1114     AlwaysCompileLoopMethods = false;
1115     UseOnStackReplacement    = false;
1116     break;
1117   case _mixed:
1118     // same as default
1119     break;
1120   case _comp:
1121     UseInterpreter           = false;
1122     BackgroundCompilation    = false;
1123     ClipInlining             = false;
1124     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1125     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1126     // compile a level 4 (C2) and then continue executing it.
1127     if (TieredCompilation) {
1128       Tier3InvokeNotifyFreqLog = 0;
1129       Tier4InvocationThreshold = 0;
1130     }
1131     break;
1132   }
1133 }
1134 
1135 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1136 // Conflict: required to use shared spaces (-Xshare:on), but
1137 // incompatible command line options were chosen.
1138 
1139 static void no_shared_spaces(const char* message) {
1140   if (RequireSharedSpaces) {
1141     jio_fprintf(defaultStream::error_stream(),
1142       "Class data sharing is inconsistent with other specified options.\n");
1143     vm_exit_during_initialization("Unable to use shared archive.", message);
1144   } else {
1145     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1146   }
1147 }
1148 #endif
1149 
1150 // Returns threshold scaled with the value of scale.
1151 // If scale < 0.0, threshold is returned without scaling.
1152 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1153   if (scale == 1.0 || scale < 0.0) {
1154     return threshold;
1155   } else {
1156     return (intx)(threshold * scale);
1157   }
1158 }
1159 
1160 // Returns freq_log scaled with the value of scale.
1161 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1162 // If scale < 0.0, freq_log is returned without scaling.
1163 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1164   // Check if scaling is necessary or if negative value was specified.
1165   if (scale == 1.0 || scale < 0.0) {
1166     return freq_log;
1167   }
1168   // Check values to avoid calculating log2 of 0.
1169   if (scale == 0.0 || freq_log == 0) {
1170     return 0;
1171   }
1172   // Determine the maximum notification frequency value currently supported.
1173   // The largest mask value that the interpreter/C1 can handle is
1174   // of length InvocationCounter::number_of_count_bits. Mask values are always
1175   // one bit shorter then the value of the notification frequency. Set
1176   // max_freq_bits accordingly.
1177   intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1178   intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1179   if (scaled_freq == 0) {
1180     // Return 0 right away to avoid calculating log2 of 0.
1181     return 0;
1182   } else if (scaled_freq > nth_bit(max_freq_bits)) {
1183     return max_freq_bits;
1184   } else {
1185     return log2_intptr(scaled_freq);
1186   }
1187 }
1188 
1189 void Arguments::set_tiered_flags() {
1190   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1191   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1192     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1193   }
1194   if (CompilationPolicyChoice < 2) {
1195     vm_exit_during_initialization(
1196       "Incompatible compilation policy selected", NULL);
1197   }
1198   // Increase the code cache size - tiered compiles a lot more.
1199   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1200     FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1201                   MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1202   }
1203   // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1204   if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1205     FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1206 
1207     if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1208       // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1209       if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1210         FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1211       }
1212       if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1213         FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1214       }
1215       // Check consistency of code heap sizes
1216       if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1217         jio_fprintf(defaultStream::error_stream(),
1218                     "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1219                     NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1220                     (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1221         vm_exit(1);
1222       }
1223     }
1224   }
1225   if (!UseInterpreter) { // -Xcomp
1226     Tier3InvokeNotifyFreqLog = 0;
1227     Tier4InvocationThreshold = 0;
1228   }
1229 
1230   if (CompileThresholdScaling < 0) {
1231     vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1232   }
1233 
1234   // Scale tiered compilation thresholds.
1235   // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1236   if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1237     FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1238     FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1239 
1240     FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1241     FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1242     FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1243     FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1244 
1245     // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1246     // once these thresholds become supported.
1247 
1248     FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1249     FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1250 
1251     FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1252     FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1253 
1254     FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1255 
1256     FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1257     FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1258     FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1259     FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1260   }
1261 }
1262 
1263 /**
1264  * Returns the minimum number of compiler threads needed to run the JVM. The following
1265  * configurations are possible.
1266  *
1267  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1268  *    compiler threads is 0.
1269  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1270  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1271  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1272  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1273  *    C1 can be used, so the minimum number of compiler threads is 1.
1274  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1275  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1276  *    the minimum number of compiler threads is 2.
1277  */
1278 int Arguments::get_min_number_of_compiler_threads() {
1279 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1280   return 0;   // case 1
1281 #else
1282   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1283     return 1; // case 2 or case 3
1284   }
1285   return 2;   // case 4 (tiered)
1286 #endif
1287 }
1288 
1289 #if INCLUDE_ALL_GCS
1290 static void disable_adaptive_size_policy(const char* collector_name) {
1291   if (UseAdaptiveSizePolicy) {
1292     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1293       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1294               collector_name);
1295     }
1296     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1297   }
1298 }
1299 
1300 void Arguments::set_parnew_gc_flags() {
1301   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1302          "control point invariant");
1303   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1304   assert(UseParNewGC, "ParNew should always be used with CMS");
1305 
1306   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1307     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1308     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1309   } else if (ParallelGCThreads == 0) {
1310     jio_fprintf(defaultStream::error_stream(),
1311         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1312     vm_exit(1);
1313   }
1314 
1315   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1316   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1317   // we set them to 1024 and 1024.
1318   // See CR 6362902.
1319   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1320     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1321   }
1322   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1323     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1324   }
1325 
1326   // When using compressed oops, we use local overflow stacks,
1327   // rather than using a global overflow list chained through
1328   // the klass word of the object's pre-image.
1329   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1330     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1331       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1332     }
1333     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1334   }
1335   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1336 }
1337 
1338 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1339 // sparc/solaris for certain applications, but would gain from
1340 // further optimization and tuning efforts, and would almost
1341 // certainly gain from analysis of platform and environment.
1342 void Arguments::set_cms_and_parnew_gc_flags() {
1343   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1344   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1345   assert(UseParNewGC, "ParNew should always be used with CMS");
1346 
1347   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1348   disable_adaptive_size_policy("UseConcMarkSweepGC");
1349 
1350   set_parnew_gc_flags();
1351 
1352   size_t max_heap = align_size_down(MaxHeapSize,
1353                                     CardTableRS::ct_max_alignment_constraint());
1354 
1355   // Now make adjustments for CMS
1356   intx   tenuring_default = (intx)6;
1357   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1358 
1359   // Preferred young gen size for "short" pauses:
1360   // upper bound depends on # of threads and NewRatio.
1361   const size_t preferred_max_new_size_unaligned =
1362     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1363   size_t preferred_max_new_size =
1364     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1365 
1366   // Unless explicitly requested otherwise, size young gen
1367   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1368 
1369   // If either MaxNewSize or NewRatio is set on the command line,
1370   // assume the user is trying to set the size of the young gen.
1371   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1372 
1373     // Set MaxNewSize to our calculated preferred_max_new_size unless
1374     // NewSize was set on the command line and it is larger than
1375     // preferred_max_new_size.
1376     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1377       FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1378     } else {
1379       FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1380     }
1381     if (PrintGCDetails && Verbose) {
1382       // Too early to use gclog_or_tty
1383       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1384     }
1385 
1386     // Code along this path potentially sets NewSize and OldSize
1387     if (PrintGCDetails && Verbose) {
1388       // Too early to use gclog_or_tty
1389       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1390            " initial_heap_size:  " SIZE_FORMAT
1391            " max_heap: " SIZE_FORMAT,
1392            min_heap_size(), InitialHeapSize, max_heap);
1393     }
1394     size_t min_new = preferred_max_new_size;
1395     if (FLAG_IS_CMDLINE(NewSize)) {
1396       min_new = NewSize;
1397     }
1398     if (max_heap > min_new && min_heap_size() > min_new) {
1399       // Unless explicitly requested otherwise, make young gen
1400       // at least min_new, and at most preferred_max_new_size.
1401       if (FLAG_IS_DEFAULT(NewSize)) {
1402         FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1403         FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1404         if (PrintGCDetails && Verbose) {
1405           // Too early to use gclog_or_tty
1406           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1407         }
1408       }
1409       // Unless explicitly requested otherwise, size old gen
1410       // so it's NewRatio x of NewSize.
1411       if (FLAG_IS_DEFAULT(OldSize)) {
1412         if (max_heap > NewSize) {
1413           FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1414           if (PrintGCDetails && Verbose) {
1415             // Too early to use gclog_or_tty
1416             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1417           }
1418         }
1419       }
1420     }
1421   }
1422   // Unless explicitly requested otherwise, definitely
1423   // promote all objects surviving "tenuring_default" scavenges.
1424   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1425       FLAG_IS_DEFAULT(SurvivorRatio)) {
1426     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1427   }
1428   // If we decided above (or user explicitly requested)
1429   // `promote all' (via MaxTenuringThreshold := 0),
1430   // prefer minuscule survivor spaces so as not to waste
1431   // space for (non-existent) survivors
1432   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1433     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1434   }
1435 
1436   // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1437   // but rather the number of free blocks of a given size that are used when
1438   // replenishing the local per-worker free list caches.
1439   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1440     if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1441       // OldPLAB sizing manually turned off: Use a larger default setting,
1442       // unless it was manually specified. This is because a too-low value
1443       // will slow down scavenges.
1444       FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1445     } else {
1446       FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1447     }
1448   }
1449 
1450   // If either of the static initialization defaults have changed, note this
1451   // modification.
1452   if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1453     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1454   }
1455 
1456   if (!ClassUnloading) {
1457     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1458     FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1459   }
1460 
1461   if (PrintGCDetails && Verbose) {
1462     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1463       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1464     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1465   }
1466 }
1467 #endif // INCLUDE_ALL_GCS
1468 
1469 void set_object_alignment() {
1470   // Object alignment.
1471   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1472   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1473   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1474   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1475   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1476   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1477 
1478   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1479   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1480 
1481   // Oop encoding heap max
1482   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1483 
1484 #if INCLUDE_ALL_GCS
1485   // Set CMS global values
1486   CompactibleFreeListSpace::set_cms_values();
1487 #endif // INCLUDE_ALL_GCS
1488 }
1489 
1490 bool verify_object_alignment() {
1491   // Object alignment.
1492   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1493     jio_fprintf(defaultStream::error_stream(),
1494                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1495                 (int)ObjectAlignmentInBytes);
1496     return false;
1497   }
1498   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1499     jio_fprintf(defaultStream::error_stream(),
1500                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1501                 (int)ObjectAlignmentInBytes, BytesPerLong);
1502     return false;
1503   }
1504   // It does not make sense to have big object alignment
1505   // since a space lost due to alignment will be greater
1506   // then a saved space from compressed oops.
1507   if ((int)ObjectAlignmentInBytes > 256) {
1508     jio_fprintf(defaultStream::error_stream(),
1509                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1510                 (int)ObjectAlignmentInBytes);
1511     return false;
1512   }
1513   // In case page size is very small.
1514   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1515     jio_fprintf(defaultStream::error_stream(),
1516                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1517                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1518     return false;
1519   }
1520   if(SurvivorAlignmentInBytes == 0) {
1521     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1522   } else {
1523     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1524       jio_fprintf(defaultStream::error_stream(),
1525             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1526             (int)SurvivorAlignmentInBytes);
1527       return false;
1528     }
1529     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1530       jio_fprintf(defaultStream::error_stream(),
1531           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1532           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1533       return false;
1534     }
1535   }
1536   return true;
1537 }
1538 
1539 size_t Arguments::max_heap_for_compressed_oops() {
1540   // Avoid sign flip.
1541   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1542   // We need to fit both the NULL page and the heap into the memory budget, while
1543   // keeping alignment constraints of the heap. To guarantee the latter, as the
1544   // NULL page is located before the heap, we pad the NULL page to the conservative
1545   // maximum alignment that the GC may ever impose upon the heap.
1546   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1547                                                         _conservative_max_heap_alignment);
1548 
1549   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1550   NOT_LP64(ShouldNotReachHere(); return 0);
1551 }
1552 
1553 bool Arguments::should_auto_select_low_pause_collector() {
1554   if (UseAutoGCSelectPolicy &&
1555       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1556       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1557     if (PrintGCDetails) {
1558       // Cannot use gclog_or_tty yet.
1559       tty->print_cr("Automatic selection of the low pause collector"
1560        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1561     }
1562     return true;
1563   }
1564   return false;
1565 }
1566 
1567 void Arguments::set_use_compressed_oops() {
1568 #ifndef ZERO
1569 #ifdef _LP64
1570   // MaxHeapSize is not set up properly at this point, but
1571   // the only value that can override MaxHeapSize if we are
1572   // to use UseCompressedOops is InitialHeapSize.
1573   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1574 
1575   if (max_heap_size <= max_heap_for_compressed_oops()) {
1576 #if !defined(COMPILER1) || defined(TIERED)
1577     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1578       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1579     }
1580 #endif
1581   } else {
1582     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1583       warning("Max heap size too large for Compressed Oops");
1584       FLAG_SET_DEFAULT(UseCompressedOops, false);
1585       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1586     }
1587   }
1588 #endif // _LP64
1589 #endif // ZERO
1590 }
1591 
1592 
1593 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1594 // set_use_compressed_oops().
1595 void Arguments::set_use_compressed_klass_ptrs() {
1596 #ifndef ZERO
1597 #ifdef _LP64
1598   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1599   if (!UseCompressedOops) {
1600     if (UseCompressedClassPointers) {
1601       warning("UseCompressedClassPointers requires UseCompressedOops");
1602     }
1603     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1604   } else {
1605     // Turn on UseCompressedClassPointers too
1606     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1607       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1608     }
1609     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1610     if (UseCompressedClassPointers) {
1611       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1612         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1613         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1614       }
1615     }
1616   }
1617 #endif // _LP64
1618 #endif // !ZERO
1619 }
1620 
1621 void Arguments::set_conservative_max_heap_alignment() {
1622   // The conservative maximum required alignment for the heap is the maximum of
1623   // the alignments imposed by several sources: any requirements from the heap
1624   // itself, the collector policy and the maximum page size we may run the VM
1625   // with.
1626   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1627 #if INCLUDE_ALL_GCS
1628   if (UseParallelGC) {
1629     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1630   } else if (UseG1GC) {
1631     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1632   }
1633 #endif // INCLUDE_ALL_GCS
1634   _conservative_max_heap_alignment = MAX4(heap_alignment,
1635                                           (size_t)os::vm_allocation_granularity(),
1636                                           os::max_page_size(),
1637                                           CollectorPolicy::compute_heap_alignment());
1638 }
1639 
1640 void Arguments::select_gc_ergonomically() {
1641   if (os::is_server_class_machine()) {
1642     if (should_auto_select_low_pause_collector()) {
1643       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1644     } else {
1645       FLAG_SET_ERGO(bool, UseParallelGC, true);
1646     }
1647   } else {
1648     FLAG_SET_ERGO(bool, UseSerialGC, true);
1649   }
1650 }
1651 
1652 void Arguments::select_gc() {
1653   if (!gc_selected()) {
1654     select_gc_ergonomically();
1655     guarantee(gc_selected(), "No GC selected");
1656   }
1657 }
1658 
1659 void Arguments::set_ergonomics_flags() {
1660   select_gc();
1661 
1662 #ifdef COMPILER2
1663   // Shared spaces work fine with other GCs but causes bytecode rewriting
1664   // to be disabled, which hurts interpreter performance and decreases
1665   // server performance.  When -server is specified, keep the default off
1666   // unless it is asked for.  Future work: either add bytecode rewriting
1667   // at link time, or rewrite bytecodes in non-shared methods.
1668   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1669       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1670     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1671   }
1672 #endif
1673 
1674   set_conservative_max_heap_alignment();
1675 
1676 #ifndef ZERO
1677 #ifdef _LP64
1678   set_use_compressed_oops();
1679 
1680   // set_use_compressed_klass_ptrs() must be called after calling
1681   // set_use_compressed_oops().
1682   set_use_compressed_klass_ptrs();
1683 
1684   // Also checks that certain machines are slower with compressed oops
1685   // in vm_version initialization code.
1686 #endif // _LP64
1687 #endif // !ZERO
1688 }
1689 
1690 void Arguments::set_parallel_gc_flags() {
1691   assert(UseParallelGC || UseParallelOldGC, "Error");
1692   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1693   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1694     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1695   }
1696   FLAG_SET_DEFAULT(UseParallelGC, true);
1697 
1698   // If no heap maximum was requested explicitly, use some reasonable fraction
1699   // of the physical memory, up to a maximum of 1GB.
1700   FLAG_SET_DEFAULT(ParallelGCThreads,
1701                    Abstract_VM_Version::parallel_worker_threads());
1702   if (ParallelGCThreads == 0) {
1703     jio_fprintf(defaultStream::error_stream(),
1704         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1705     vm_exit(1);
1706   }
1707 
1708   if (UseAdaptiveSizePolicy) {
1709     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1710     // unless the user actually sets these flags.
1711     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1712       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1713       _min_heap_free_ratio = MinHeapFreeRatio;
1714     }
1715     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1716       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1717       _max_heap_free_ratio = MaxHeapFreeRatio;
1718     }
1719   }
1720 
1721   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1722   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1723   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1724   // See CR 6362902 for details.
1725   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1726     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1727        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1728     }
1729     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1730       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1731     }
1732   }
1733 
1734   if (UseParallelOldGC) {
1735     // Par compact uses lower default values since they are treated as
1736     // minimums.  These are different defaults because of the different
1737     // interpretation and are not ergonomically set.
1738     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1739       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1740     }
1741   }
1742 }
1743 
1744 void Arguments::set_g1_gc_flags() {
1745   assert(UseG1GC, "Error");
1746 #ifdef COMPILER1
1747   FastTLABRefill = false;
1748 #endif
1749   FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1750   if (ParallelGCThreads == 0) {
1751     assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1752     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1753   }
1754 
1755 #if INCLUDE_ALL_GCS
1756   if (G1ConcRefinementThreads == 0) {
1757     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1758   }
1759 #endif
1760 
1761   // MarkStackSize will be set (if it hasn't been set by the user)
1762   // when concurrent marking is initialized.
1763   // Its value will be based upon the number of parallel marking threads.
1764   // But we do set the maximum mark stack size here.
1765   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1766     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1767   }
1768 
1769   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1770     // In G1, we want the default GC overhead goal to be higher than
1771     // say in PS. So we set it here to 10%. Otherwise the heap might
1772     // be expanded more aggressively than we would like it to. In
1773     // fact, even 10% seems to not be high enough in some cases
1774     // (especially small GC stress tests that the main thing they do
1775     // is allocation). We might consider increase it further.
1776     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1777   }
1778 
1779   if (PrintGCDetails && Verbose) {
1780     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1781       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1782     tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1783   }
1784 }
1785 
1786 #if !INCLUDE_ALL_GCS
1787 #ifdef ASSERT
1788 static bool verify_serial_gc_flags() {
1789   return (UseSerialGC &&
1790         !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1791           UseParallelGC || UseParallelOldGC));
1792 }
1793 #endif // ASSERT
1794 #endif // INCLUDE_ALL_GCS
1795 
1796 void Arguments::set_gc_specific_flags() {
1797 #if INCLUDE_ALL_GCS
1798   // Set per-collector flags
1799   if (UseParallelGC || UseParallelOldGC) {
1800     set_parallel_gc_flags();
1801   } else if (UseConcMarkSweepGC) {
1802     set_cms_and_parnew_gc_flags();
1803   } else if (UseG1GC) {
1804     set_g1_gc_flags();
1805   }
1806   check_deprecated_gc_flags();
1807   if (AssumeMP && !UseSerialGC) {
1808     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1809       warning("If the number of processors is expected to increase from one, then"
1810               " you should configure the number of parallel GC threads appropriately"
1811               " using -XX:ParallelGCThreads=N");
1812     }
1813   }
1814   if (MinHeapFreeRatio == 100) {
1815     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1816     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1817   }
1818 #else // INCLUDE_ALL_GCS
1819   assert(verify_serial_gc_flags(), "SerialGC unset");
1820 #endif // INCLUDE_ALL_GCS
1821 }
1822 
1823 julong Arguments::limit_by_allocatable_memory(julong limit) {
1824   julong max_allocatable;
1825   julong result = limit;
1826   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1827     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1828   }
1829   return result;
1830 }
1831 
1832 // Use static initialization to get the default before parsing
1833 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1834 
1835 void Arguments::set_heap_size() {
1836   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1837     // Deprecated flag
1838     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1839   }
1840 
1841   const julong phys_mem =
1842     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1843                             : (julong)MaxRAM;
1844 
1845   // If the maximum heap size has not been set with -Xmx,
1846   // then set it as fraction of the size of physical memory,
1847   // respecting the maximum and minimum sizes of the heap.
1848   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1849     julong reasonable_max = phys_mem / MaxRAMFraction;
1850 
1851     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1852       // Small physical memory, so use a minimum fraction of it for the heap
1853       reasonable_max = phys_mem / MinRAMFraction;
1854     } else {
1855       // Not-small physical memory, so require a heap at least
1856       // as large as MaxHeapSize
1857       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1858     }
1859     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1860       // Limit the heap size to ErgoHeapSizeLimit
1861       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1862     }
1863     if (UseCompressedOops) {
1864       // Limit the heap size to the maximum possible when using compressed oops
1865       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1866 
1867       // HeapBaseMinAddress can be greater than default but not less than.
1868       if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1869         if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1870           // matches compressed oops printing flags
1871           if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1872             jio_fprintf(defaultStream::error_stream(),
1873                         "HeapBaseMinAddress must be at least " SIZE_FORMAT
1874                         " (" SIZE_FORMAT "G) which is greater than value given "
1875                         SIZE_FORMAT "\n",
1876                         DefaultHeapBaseMinAddress,
1877                         DefaultHeapBaseMinAddress/G,
1878                         HeapBaseMinAddress);
1879           }
1880           FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1881         }
1882       }
1883 
1884       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1885         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1886         // but it should be not less than default MaxHeapSize.
1887         max_coop_heap -= HeapBaseMinAddress;
1888       }
1889       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1890     }
1891     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1892 
1893     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1894       // An initial heap size was specified on the command line,
1895       // so be sure that the maximum size is consistent.  Done
1896       // after call to limit_by_allocatable_memory because that
1897       // method might reduce the allocation size.
1898       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1899     }
1900 
1901     if (PrintGCDetails && Verbose) {
1902       // Cannot use gclog_or_tty yet.
1903       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1904     }
1905     FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1906   }
1907 
1908   // If the minimum or initial heap_size have not been set or requested to be set
1909   // ergonomically, set them accordingly.
1910   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1911     julong reasonable_minimum = (julong)(OldSize + NewSize);
1912 
1913     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1914 
1915     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1916 
1917     if (InitialHeapSize == 0) {
1918       julong reasonable_initial = phys_mem / InitialRAMFraction;
1919 
1920       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1921       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1922 
1923       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1924 
1925       if (PrintGCDetails && Verbose) {
1926         // Cannot use gclog_or_tty yet.
1927         tty->print_cr("  Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1928       }
1929       FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1930     }
1931     // If the minimum heap size has not been set (via -Xms),
1932     // synchronize with InitialHeapSize to avoid errors with the default value.
1933     if (min_heap_size() == 0) {
1934       set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1935       if (PrintGCDetails && Verbose) {
1936         // Cannot use gclog_or_tty yet.
1937         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1938       }
1939     }
1940   }
1941 }
1942 
1943 // This must be called after ergonomics.
1944 void Arguments::set_bytecode_flags() {
1945   if (!RewriteBytecodes) {
1946     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1947   }
1948 }
1949 
1950 // Aggressive optimization flags  -XX:+AggressiveOpts
1951 void Arguments::set_aggressive_opts_flags() {
1952 #ifdef COMPILER2
1953   if (AggressiveUnboxing) {
1954     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1955       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1956     } else if (!EliminateAutoBox) {
1957       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1958       AggressiveUnboxing = false;
1959     }
1960     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1961       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1962     } else if (!DoEscapeAnalysis) {
1963       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1964       AggressiveUnboxing = false;
1965     }
1966   }
1967   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1968     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1969       FLAG_SET_DEFAULT(EliminateAutoBox, true);
1970     }
1971     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1972       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1973     }
1974 
1975     // Feed the cache size setting into the JDK
1976     char buffer[1024];
1977     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1978     add_property(buffer);
1979   }
1980   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1981     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1982   }
1983 #endif
1984 
1985   if (AggressiveOpts) {
1986 // Sample flag setting code
1987 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1988 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
1989 //    }
1990   }
1991 }
1992 
1993 //===========================================================================================================
1994 // Parsing of java.compiler property
1995 
1996 void Arguments::process_java_compiler_argument(char* arg) {
1997   // For backwards compatibility, Djava.compiler=NONE or ""
1998   // causes us to switch to -Xint mode UNLESS -Xdebug
1999   // is also specified.
2000   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2001     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2002   }
2003 }
2004 
2005 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2006   _sun_java_launcher = os::strdup_check_oom(launcher);
2007 }
2008 
2009 bool Arguments::created_by_java_launcher() {
2010   assert(_sun_java_launcher != NULL, "property must have value");
2011   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2012 }
2013 
2014 bool Arguments::sun_java_launcher_is_altjvm() {
2015   return _sun_java_launcher_is_altjvm;
2016 }
2017 
2018 //===========================================================================================================
2019 // Parsing of main arguments
2020 
2021 bool Arguments::verify_interval(uintx val, uintx min,
2022                                 uintx max, const char* name) {
2023   // Returns true iff value is in the inclusive interval [min..max]
2024   // false, otherwise.
2025   if (val >= min && val <= max) {
2026     return true;
2027   }
2028   jio_fprintf(defaultStream::error_stream(),
2029               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2030               " and " UINTX_FORMAT "\n",
2031               name, val, min, max);
2032   return false;
2033 }
2034 
2035 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2036   // Returns true if given value is at least specified min threshold
2037   // false, otherwise.
2038   if (val >= min ) {
2039       return true;
2040   }
2041   jio_fprintf(defaultStream::error_stream(),
2042               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2043               name, val, min);
2044   return false;
2045 }
2046 
2047 bool Arguments::verify_percentage(uintx value, const char* name) {
2048   if (is_percentage(value)) {
2049     return true;
2050   }
2051   jio_fprintf(defaultStream::error_stream(),
2052               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2053               name, value);
2054   return false;
2055 }
2056 
2057 // check if do gclog rotation
2058 // +UseGCLogFileRotation is a must,
2059 // no gc log rotation when log file not supplied or
2060 // NumberOfGCLogFiles is 0
2061 void check_gclog_consistency() {
2062   if (UseGCLogFileRotation) {
2063     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2064       jio_fprintf(defaultStream::output_stream(),
2065                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2066                   "where num_of_file > 0\n"
2067                   "GC log rotation is turned off\n");
2068       UseGCLogFileRotation = false;
2069     }
2070   }
2071 
2072   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2073     FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K);
2074     jio_fprintf(defaultStream::output_stream(),
2075                 "GCLogFileSize changed to minimum 8K\n");
2076   }
2077 }
2078 
2079 // This function is called for -Xloggc:<filename>, it can be used
2080 // to check if a given file name(or string) conforms to the following
2081 // specification:
2082 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2083 // %p and %t only allowed once. We only limit usage of filename not path
2084 bool is_filename_valid(const char *file_name) {
2085   const char* p = file_name;
2086   char file_sep = os::file_separator()[0];
2087   const char* cp;
2088   // skip prefix path
2089   for (cp = file_name; *cp != '\0'; cp++) {
2090     if (*cp == '/' || *cp == file_sep) {
2091       p = cp + 1;
2092     }
2093   }
2094 
2095   int count_p = 0;
2096   int count_t = 0;
2097   while (*p != '\0') {
2098     if ((*p >= '0' && *p <= '9') ||
2099         (*p >= 'A' && *p <= 'Z') ||
2100         (*p >= 'a' && *p <= 'z') ||
2101          *p == '-'               ||
2102          *p == '_'               ||
2103          *p == '.') {
2104        p++;
2105        continue;
2106     }
2107     if (*p == '%') {
2108       if(*(p + 1) == 'p') {
2109         p += 2;
2110         count_p ++;
2111         continue;
2112       }
2113       if (*(p + 1) == 't') {
2114         p += 2;
2115         count_t ++;
2116         continue;
2117       }
2118     }
2119     return false;
2120   }
2121   return count_p < 2 && count_t < 2;
2122 }
2123 
2124 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2125   if (!is_percentage(min_heap_free_ratio)) {
2126     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2127     return false;
2128   }
2129   if (min_heap_free_ratio > MaxHeapFreeRatio) {
2130     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2131                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2132                   MaxHeapFreeRatio);
2133     return false;
2134   }
2135   // This does not set the flag itself, but stores the value in a safe place for later usage.
2136   _min_heap_free_ratio = min_heap_free_ratio;
2137   return true;
2138 }
2139 
2140 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2141   if (!is_percentage(max_heap_free_ratio)) {
2142     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2143     return false;
2144   }
2145   if (max_heap_free_ratio < MinHeapFreeRatio) {
2146     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2147                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2148                   MinHeapFreeRatio);
2149     return false;
2150   }
2151   // This does not set the flag itself, but stores the value in a safe place for later usage.
2152   _max_heap_free_ratio = max_heap_free_ratio;
2153   return true;
2154 }
2155 
2156 // Check consistency of GC selection
2157 bool Arguments::check_gc_consistency() {
2158   check_gclog_consistency();
2159   // Ensure that the user has not selected conflicting sets
2160   // of collectors.
2161   uint i = 0;
2162   if (UseSerialGC)                       i++;
2163   if (UseConcMarkSweepGC)                i++;
2164   if (UseParallelGC || UseParallelOldGC) i++;
2165   if (UseG1GC)                           i++;
2166   if (i > 1) {
2167     jio_fprintf(defaultStream::error_stream(),
2168                 "Conflicting collector combinations in option list; "
2169                 "please refer to the release notes for the combinations "
2170                 "allowed\n");
2171     return false;
2172   }
2173 
2174   if (UseConcMarkSweepGC && !UseParNewGC) {
2175     jio_fprintf(defaultStream::error_stream(),
2176         "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2177     return false;
2178   }
2179 
2180   if (UseParNewGC && !UseConcMarkSweepGC) {
2181     jio_fprintf(defaultStream::error_stream(),
2182         "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2183     return false;
2184   }
2185 
2186   return true;
2187 }
2188 
2189 void Arguments::check_deprecated_gc_flags() {
2190   if (FLAG_IS_CMDLINE(UseParNewGC)) {
2191     warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2192   }
2193   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2194     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2195             "and will likely be removed in future release");
2196   }
2197   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2198     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2199         "Use MaxRAMFraction instead.");
2200   }
2201 }
2202 
2203 // Check stack pages settings
2204 bool Arguments::check_stack_pages()
2205 {
2206   bool status = true;
2207   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2208   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2209   // greater stack shadow pages can't generate instruction to bang stack
2210   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2211   return status;
2212 }
2213 
2214 // Check the consistency of vm_init_args
2215 bool Arguments::check_vm_args_consistency() {
2216   // Method for adding checks for flag consistency.
2217   // The intent is to warn the user of all possible conflicts,
2218   // before returning an error.
2219   // Note: Needs platform-dependent factoring.
2220   bool status = true;
2221 
2222   if (TLABRefillWasteFraction == 0) {
2223     jio_fprintf(defaultStream::error_stream(),
2224                 "TLABRefillWasteFraction should be a denominator, "
2225                 "not " SIZE_FORMAT "\n",
2226                 TLABRefillWasteFraction);
2227     status = false;
2228   }
2229 
2230   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2231                               "AdaptiveSizePolicyWeight");
2232   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2233 
2234   // Divide by bucket size to prevent a large size from causing rollover when
2235   // calculating amount of memory needed to be allocated for the String table.
2236   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2237     (max_uintx / StringTable::bucket_size()), "StringTable size");
2238 
2239   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2240     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2241 
2242   {
2243     // Using "else if" below to avoid printing two error messages if min > max.
2244     // This will also prevent us from reporting both min>100 and max>100 at the
2245     // same time, but that is less annoying than printing two identical errors IMHO.
2246     FormatBuffer<80> err_msg("%s","");
2247     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2248       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2249       status = false;
2250     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2251       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2252       status = false;
2253     }
2254   }
2255 
2256   // Min/MaxMetaspaceFreeRatio
2257   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2258   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2259 
2260   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2261     jio_fprintf(defaultStream::error_stream(),
2262                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2263                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2264                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2265                 MinMetaspaceFreeRatio,
2266                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2267                 MaxMetaspaceFreeRatio);
2268     status = false;
2269   }
2270 
2271   // Trying to keep 100% free is not practical
2272   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2273 
2274   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2275     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2276   }
2277 
2278   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2279     // Settings to encourage splitting.
2280     if (!FLAG_IS_CMDLINE(NewRatio)) {
2281       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2282     }
2283     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2284       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2285     }
2286   }
2287 
2288   if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2289     FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2290   }
2291 
2292   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2293   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2294   if (GCTimeLimit == 100) {
2295     // Turn off gc-overhead-limit-exceeded checks
2296     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2297   }
2298 
2299   status = status && check_gc_consistency();
2300   status = status && check_stack_pages();
2301 
2302   status = status && verify_percentage(CMSIncrementalSafetyFactor,
2303                                     "CMSIncrementalSafetyFactor");
2304 
2305   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2306   // insists that we hold the requisite locks so that the iteration is
2307   // MT-safe. For the verification at start-up and shut-down, we don't
2308   // yet have a good way of acquiring and releasing these locks,
2309   // which are not visible at the CollectedHeap level. We want to
2310   // be able to acquire these locks and then do the iteration rather
2311   // than just disable the lock verification. This will be fixed under
2312   // bug 4788986.
2313   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2314     if (VerifyDuringStartup) {
2315       warning("Heap verification at start-up disabled "
2316               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2317       VerifyDuringStartup = false; // Disable verification at start-up
2318     }
2319 
2320     if (VerifyBeforeExit) {
2321       warning("Heap verification at shutdown disabled "
2322               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2323       VerifyBeforeExit = false; // Disable verification at shutdown
2324     }
2325   }
2326 
2327   // Note: only executed in non-PRODUCT mode
2328   if (!UseAsyncConcMarkSweepGC &&
2329       (ExplicitGCInvokesConcurrent ||
2330        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2331     jio_fprintf(defaultStream::error_stream(),
2332                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2333                 " with -UseAsyncConcMarkSweepGC");
2334     status = false;
2335   }
2336 
2337   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2338 
2339 #if INCLUDE_ALL_GCS
2340   if (UseG1GC) {
2341     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2342     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2343     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2344 
2345     status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2346     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2347                                          "InitiatingHeapOccupancyPercent");
2348     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2349                                         "G1RefProcDrainInterval");
2350     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2351                                         "G1ConcMarkStepDurationMillis");
2352     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2353                                        "G1ConcRSHotCardLimit");
2354     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2355                                        "G1ConcRSLogCacheSize");
2356     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2357                                        "StringDeduplicationAgeThreshold");
2358   }
2359   if (UseConcMarkSweepGC) {
2360     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2361     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2362     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2363     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2364 
2365     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2366 
2367     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2368     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2369     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2370 
2371     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2372 
2373     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2374     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2375 
2376     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2377     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2378     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2379 
2380     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2381 
2382     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2383 
2384     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2385     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2386     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2387     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2388     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2389   }
2390 
2391   if (UseParallelGC || UseParallelOldGC) {
2392     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2393     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2394 
2395     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2396     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2397 
2398     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2399     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2400 
2401     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2402 
2403     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2404   }
2405 #endif // INCLUDE_ALL_GCS
2406 
2407   status = status && verify_interval(RefDiscoveryPolicy,
2408                                      ReferenceProcessor::DiscoveryPolicyMin,
2409                                      ReferenceProcessor::DiscoveryPolicyMax,
2410                                      "RefDiscoveryPolicy");
2411 
2412   // Limit the lower bound of this flag to 1 as it is used in a division
2413   // expression.
2414   status = status && verify_interval(TLABWasteTargetPercent,
2415                                      1, 100, "TLABWasteTargetPercent");
2416 
2417   status = status && verify_object_alignment();
2418 
2419   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2420                                       "CompressedClassSpaceSize");
2421 
2422   status = status && verify_interval(MarkStackSizeMax,
2423                                   1, (max_jint - 1), "MarkStackSizeMax");
2424   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2425 
2426   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2427 
2428   status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread");
2429 
2430   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2431 
2432   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2433   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2434 
2435   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2436 
2437   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2438   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2439   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2440   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2441 
2442   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2443   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2444 
2445   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2446   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2447   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2448 
2449   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2450   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2451 
2452   status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2453   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2454   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2455   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2456 
2457   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2458 #ifdef COMPILER1
2459   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2460 #endif
2461   status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2462 
2463   if (PrintNMTStatistics) {
2464 #if INCLUDE_NMT
2465     if (MemTracker::tracking_level() == NMT_off) {
2466 #endif // INCLUDE_NMT
2467       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2468       PrintNMTStatistics = false;
2469 #if INCLUDE_NMT
2470     }
2471 #endif
2472   }
2473 
2474   // Need to limit the extent of the padding to reasonable size.
2475   // 8K is well beyond the reasonable HW cache line size, even with the
2476   // aggressive prefetching, while still leaving the room for segregating
2477   // among the distinct pages.
2478   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2479     jio_fprintf(defaultStream::error_stream(),
2480                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2481                 ContendedPaddingWidth, 0, 8192);
2482     status = false;
2483   }
2484 
2485   // Need to enforce the padding not to break the existing field alignments.
2486   // It is sufficient to check against the largest type size.
2487   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2488     jio_fprintf(defaultStream::error_stream(),
2489                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2490                 ContendedPaddingWidth, BytesPerLong);
2491     status = false;
2492   }
2493 
2494   // Check lower bounds of the code cache
2495   // Template Interpreter code is approximately 3X larger in debug builds.
2496   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2497   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2498     jio_fprintf(defaultStream::error_stream(),
2499                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2500                 os::vm_page_size()/K);
2501     status = false;
2502   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2503     jio_fprintf(defaultStream::error_stream(),
2504                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2505                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2506     status = false;
2507   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2508     jio_fprintf(defaultStream::error_stream(),
2509                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2510                 min_code_cache_size/K);
2511     status = false;
2512   } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2513     // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2514     jio_fprintf(defaultStream::error_stream(),
2515                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2516                 CODE_CACHE_SIZE_LIMIT/M);
2517     status = false;
2518   } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2519     jio_fprintf(defaultStream::error_stream(),
2520                 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2521                 min_code_cache_size/K);
2522     status = false;
2523   } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2524              && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2525     jio_fprintf(defaultStream::error_stream(),
2526                 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2527                 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2528                 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2529     status = false;
2530   }
2531 
2532   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2533   status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2534   status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2535   status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2536 
2537 
2538   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2539   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2540   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2541   // Check the minimum number of compiler threads
2542   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2543 
2544   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2545     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2546   }
2547 
2548   return status;
2549 }
2550 
2551 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2552   const char* option_type) {
2553   if (ignore) return false;
2554 
2555   const char* spacer = " ";
2556   if (option_type == NULL) {
2557     option_type = ++spacer; // Set both to the empty string.
2558   }
2559 
2560   if (os::obsolete_option(option)) {
2561     jio_fprintf(defaultStream::error_stream(),
2562                 "Obsolete %s%soption: %s\n", option_type, spacer,
2563       option->optionString);
2564     return false;
2565   } else {
2566     jio_fprintf(defaultStream::error_stream(),
2567                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2568       option->optionString);
2569     return true;
2570   }
2571 }
2572 
2573 static const char* user_assertion_options[] = {
2574   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2575 };
2576 
2577 static const char* system_assertion_options[] = {
2578   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2579 };
2580 
2581 bool Arguments::parse_uintx(const char* value,
2582                             uintx* uintx_arg,
2583                             uintx min_size) {
2584 
2585   // Check the sign first since atomull() parses only unsigned values.
2586   bool value_is_positive = !(*value == '-');
2587 
2588   if (value_is_positive) {
2589     julong n;
2590     bool good_return = atomull(value, &n);
2591     if (good_return) {
2592       bool above_minimum = n >= min_size;
2593       bool value_is_too_large = n > max_uintx;
2594 
2595       if (above_minimum && !value_is_too_large) {
2596         *uintx_arg = n;
2597         return true;
2598       }
2599     }
2600   }
2601   return false;
2602 }
2603 
2604 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2605                                                   julong* long_arg,
2606                                                   julong min_size) {
2607   if (!atomull(s, long_arg)) return arg_unreadable;
2608   return check_memory_size(*long_arg, min_size);
2609 }
2610 
2611 // Parse JavaVMInitArgs structure
2612 
2613 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2614   // For components of the system classpath.
2615   SysClassPath scp(Arguments::get_sysclasspath());
2616   bool scp_assembly_required = false;
2617 
2618   // Save default settings for some mode flags
2619   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2620   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2621   Arguments::_ClipInlining             = ClipInlining;
2622   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2623   if (TieredCompilation) {
2624     Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2625     Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2626   }
2627 
2628   // Setup flags for mixed which is the default
2629   set_mode_flags(_mixed);
2630 
2631   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2632   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2633   if (result != JNI_OK) {
2634     return result;
2635   }
2636 
2637   // Parse JavaVMInitArgs structure passed in
2638   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2639   if (result != JNI_OK) {
2640     return result;
2641   }
2642 
2643   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2644   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2645   if (result != JNI_OK) {
2646     return result;
2647   }
2648 
2649   // Do final processing now that all arguments have been parsed
2650   result = finalize_vm_init_args(&scp, scp_assembly_required);
2651   if (result != JNI_OK) {
2652     return result;
2653   }
2654 
2655   return JNI_OK;
2656 }
2657 
2658 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2659 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2660 // are dealing with -agentpath (case where name is a path), otherwise with
2661 // -agentlib
2662 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2663   char *_name;
2664   const char *_hprof = "hprof", *_jdwp = "jdwp";
2665   size_t _len_hprof, _len_jdwp, _len_prefix;
2666 
2667   if (is_path) {
2668     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2669       return false;
2670     }
2671 
2672     _name++;  // skip past last path separator
2673     _len_prefix = strlen(JNI_LIB_PREFIX);
2674 
2675     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2676       return false;
2677     }
2678 
2679     _name += _len_prefix;
2680     _len_hprof = strlen(_hprof);
2681     _len_jdwp = strlen(_jdwp);
2682 
2683     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2684       _name += _len_hprof;
2685     }
2686     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2687       _name += _len_jdwp;
2688     }
2689     else {
2690       return false;
2691     }
2692 
2693     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2694       return false;
2695     }
2696 
2697     return true;
2698   }
2699 
2700   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2701     return true;
2702   }
2703 
2704   return false;
2705 }
2706 
2707 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2708                                        SysClassPath* scp_p,
2709                                        bool* scp_assembly_required_p,
2710                                        Flag::Flags origin) {
2711   // Remaining part of option string
2712   const char* tail;
2713 
2714   // iterate over arguments
2715   DumpVMOptions(args, "Parse each");
2716   for (int index = 0; index < args->nOptions; index++) {
2717     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2718 
2719     const JavaVMOption* option = args->options + index;
2720 
2721     if (!match_option(option, "-Djava.class.path", &tail) &&
2722         !match_option(option, "-Dsun.java.command", &tail) &&
2723         !match_option(option, "-Dsun.java.launcher", &tail)) {
2724 
2725         // add all jvm options to the jvm_args string. This string
2726         // is used later to set the java.vm.args PerfData string constant.
2727         // the -Djava.class.path and the -Dsun.java.command options are
2728         // omitted from jvm_args string as each have their own PerfData
2729         // string constant object.
2730         build_jvm_args(option->optionString);
2731     }
2732 
2733     // -verbose:[class/gc/jni]
2734     if (match_option(option, "-verbose", &tail)) {
2735       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2736         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2737         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2738       } else if (!strcmp(tail, ":gc")) {
2739         FLAG_SET_CMDLINE(bool, PrintGC, true);
2740       } else if (!strcmp(tail, ":jni")) {
2741         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2742       }
2743     // -da / -ea / -disableassertions / -enableassertions
2744     // These accept an optional class/package name separated by a colon, e.g.,
2745     // -da:java.lang.Thread.
2746     } else if (match_option(option, user_assertion_options, &tail, true)) {
2747       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2748       if (*tail == '\0') {
2749         JavaAssertions::setUserClassDefault(enable);
2750       } else {
2751         assert(*tail == ':', "bogus match by match_option()");
2752         JavaAssertions::addOption(tail + 1, enable);
2753       }
2754     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2755     } else if (match_option(option, system_assertion_options, &tail, false)) {
2756       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2757       JavaAssertions::setSystemClassDefault(enable);
2758     // -bootclasspath:
2759     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2760       scp_p->reset_path(tail);
2761       *scp_assembly_required_p = true;
2762     // -bootclasspath/a:
2763     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2764       scp_p->add_suffix(tail);
2765       *scp_assembly_required_p = true;
2766     // -bootclasspath/p:
2767     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2768       scp_p->add_prefix(tail);
2769       *scp_assembly_required_p = true;
2770     // -Xrun
2771     } else if (match_option(option, "-Xrun", &tail)) {
2772       if (tail != NULL) {
2773         const char* pos = strchr(tail, ':');
2774         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2775         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2776         name[len] = '\0';
2777 
2778         char *options = NULL;
2779         if(pos != NULL) {
2780           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2781           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2782         }
2783 #if !INCLUDE_JVMTI
2784         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2785           jio_fprintf(defaultStream::error_stream(),
2786             "Profiling and debugging agents are not supported in this VM\n");
2787           return JNI_ERR;
2788         }
2789 #endif // !INCLUDE_JVMTI
2790         add_init_library(name, options);
2791       }
2792     // -agentlib and -agentpath
2793     } else if (match_option(option, "-agentlib:", &tail) ||
2794           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2795       if(tail != NULL) {
2796         const char* pos = strchr(tail, '=');
2797         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2798         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2799         name[len] = '\0';
2800 
2801         char *options = NULL;
2802         if(pos != NULL) {
2803           options = os::strdup_check_oom(pos + 1, mtInternal);
2804         }
2805 #if !INCLUDE_JVMTI
2806         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2807           jio_fprintf(defaultStream::error_stream(),
2808             "Profiling and debugging agents are not supported in this VM\n");
2809           return JNI_ERR;
2810         }
2811 #endif // !INCLUDE_JVMTI
2812         add_init_agent(name, options, is_absolute_path);
2813       }
2814     // -javaagent
2815     } else if (match_option(option, "-javaagent:", &tail)) {
2816 #if !INCLUDE_JVMTI
2817       jio_fprintf(defaultStream::error_stream(),
2818         "Instrumentation agents are not supported in this VM\n");
2819       return JNI_ERR;
2820 #else
2821       if(tail != NULL) {
2822         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2823         add_init_agent("instrument", options, false);
2824       }
2825 #endif // !INCLUDE_JVMTI
2826     // -Xnoclassgc
2827     } else if (match_option(option, "-Xnoclassgc")) {
2828       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2829     // -Xconcgc
2830     } else if (match_option(option, "-Xconcgc")) {
2831       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2832     // -Xnoconcgc
2833     } else if (match_option(option, "-Xnoconcgc")) {
2834       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2835     // -Xbatch
2836     } else if (match_option(option, "-Xbatch")) {
2837       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2838     // -Xmn for compatibility with other JVM vendors
2839     } else if (match_option(option, "-Xmn", &tail)) {
2840       julong long_initial_young_size = 0;
2841       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2842       if (errcode != arg_in_range) {
2843         jio_fprintf(defaultStream::error_stream(),
2844                     "Invalid initial young generation size: %s\n", option->optionString);
2845         describe_range_error(errcode);
2846         return JNI_EINVAL;
2847       }
2848       FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size);
2849       FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size);
2850     // -Xms
2851     } else if (match_option(option, "-Xms", &tail)) {
2852       julong long_initial_heap_size = 0;
2853       // an initial heap size of 0 means automatically determine
2854       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2855       if (errcode != arg_in_range) {
2856         jio_fprintf(defaultStream::error_stream(),
2857                     "Invalid initial heap size: %s\n", option->optionString);
2858         describe_range_error(errcode);
2859         return JNI_EINVAL;
2860       }
2861       set_min_heap_size((size_t)long_initial_heap_size);
2862       // Currently the minimum size and the initial heap sizes are the same.
2863       // Can be overridden with -XX:InitialHeapSize.
2864       FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size);
2865     // -Xmx
2866     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2867       julong long_max_heap_size = 0;
2868       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2869       if (errcode != arg_in_range) {
2870         jio_fprintf(defaultStream::error_stream(),
2871                     "Invalid maximum heap size: %s\n", option->optionString);
2872         describe_range_error(errcode);
2873         return JNI_EINVAL;
2874       }
2875       FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size);
2876     // Xmaxf
2877     } else if (match_option(option, "-Xmaxf", &tail)) {
2878       char* err;
2879       int maxf = (int)(strtod(tail, &err) * 100);
2880       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2881         jio_fprintf(defaultStream::error_stream(),
2882                     "Bad max heap free percentage size: %s\n",
2883                     option->optionString);
2884         return JNI_EINVAL;
2885       } else {
2886         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2887       }
2888     // Xminf
2889     } else if (match_option(option, "-Xminf", &tail)) {
2890       char* err;
2891       int minf = (int)(strtod(tail, &err) * 100);
2892       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2893         jio_fprintf(defaultStream::error_stream(),
2894                     "Bad min heap free percentage size: %s\n",
2895                     option->optionString);
2896         return JNI_EINVAL;
2897       } else {
2898         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2899       }
2900     // -Xss
2901     } else if (match_option(option, "-Xss", &tail)) {
2902       julong long_ThreadStackSize = 0;
2903       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2904       if (errcode != arg_in_range) {
2905         jio_fprintf(defaultStream::error_stream(),
2906                     "Invalid thread stack size: %s\n", option->optionString);
2907         describe_range_error(errcode);
2908         return JNI_EINVAL;
2909       }
2910       // Internally track ThreadStackSize in units of 1024 bytes.
2911       FLAG_SET_CMDLINE(intx, ThreadStackSize,
2912                               round_to((int)long_ThreadStackSize, K) / K);
2913     // -Xoss
2914     } else if (match_option(option, "-Xoss", &tail)) {
2915           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2916     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2917       julong long_CodeCacheExpansionSize = 0;
2918       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2919       if (errcode != arg_in_range) {
2920         jio_fprintf(defaultStream::error_stream(),
2921                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2922                    os::vm_page_size()/K);
2923         return JNI_EINVAL;
2924       }
2925       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2926     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2927                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2928       julong long_ReservedCodeCacheSize = 0;
2929 
2930       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2931       if (errcode != arg_in_range) {
2932         jio_fprintf(defaultStream::error_stream(),
2933                     "Invalid maximum code cache size: %s.\n", option->optionString);
2934         return JNI_EINVAL;
2935       }
2936       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2937       // -XX:NonNMethodCodeHeapSize=
2938     } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2939       julong long_NonNMethodCodeHeapSize = 0;
2940 
2941       ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2942       if (errcode != arg_in_range) {
2943         jio_fprintf(defaultStream::error_stream(),
2944                     "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2945         return JNI_EINVAL;
2946       }
2947       FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2948       // -XX:ProfiledCodeHeapSize=
2949     } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2950       julong long_ProfiledCodeHeapSize = 0;
2951 
2952       ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2953       if (errcode != arg_in_range) {
2954         jio_fprintf(defaultStream::error_stream(),
2955                     "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2956         return JNI_EINVAL;
2957       }
2958       FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2959       // -XX:NonProfiledCodeHeapSizee=
2960     } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2961       julong long_NonProfiledCodeHeapSize = 0;
2962 
2963       ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2964       if (errcode != arg_in_range) {
2965         jio_fprintf(defaultStream::error_stream(),
2966                     "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2967         return JNI_EINVAL;
2968       }
2969       FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2970       //-XX:IncreaseFirstTierCompileThresholdAt=
2971     } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2972         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2973         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2974           jio_fprintf(defaultStream::error_stream(),
2975                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2976                       option->optionString);
2977           return JNI_EINVAL;
2978         }
2979         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2980     // -green
2981     } else if (match_option(option, "-green")) {
2982       jio_fprintf(defaultStream::error_stream(),
2983                   "Green threads support not available\n");
2984           return JNI_EINVAL;
2985     // -native
2986     } else if (match_option(option, "-native")) {
2987           // HotSpot always uses native threads, ignore silently for compatibility
2988     // -Xsqnopause
2989     } else if (match_option(option, "-Xsqnopause")) {
2990           // EVM option, ignore silently for compatibility
2991     // -Xrs
2992     } else if (match_option(option, "-Xrs")) {
2993           // Classic/EVM option, new functionality
2994       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2995     } else if (match_option(option, "-Xusealtsigs")) {
2996           // change default internal VM signals used - lower case for back compat
2997       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2998     // -Xoptimize
2999     } else if (match_option(option, "-Xoptimize")) {
3000           // EVM option, ignore silently for compatibility
3001     // -Xprof
3002     } else if (match_option(option, "-Xprof")) {
3003 #if INCLUDE_FPROF
3004       _has_profile = true;
3005 #else // INCLUDE_FPROF
3006       jio_fprintf(defaultStream::error_stream(),
3007         "Flat profiling is not supported in this VM.\n");
3008       return JNI_ERR;
3009 #endif // INCLUDE_FPROF
3010     // -Xconcurrentio
3011     } else if (match_option(option, "-Xconcurrentio")) {
3012       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3013       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3014       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3015       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3016       FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
3017 
3018       // -Xinternalversion
3019     } else if (match_option(option, "-Xinternalversion")) {
3020       jio_fprintf(defaultStream::output_stream(), "%s\n",
3021                   VM_Version::internal_vm_info_string());
3022       vm_exit(0);
3023 #ifndef PRODUCT
3024     // -Xprintflags
3025     } else if (match_option(option, "-Xprintflags")) {
3026       CommandLineFlags::printFlags(tty, false);
3027       vm_exit(0);
3028 #endif
3029     // -D
3030     } else if (match_option(option, "-D", &tail)) {
3031       const char* value;
3032       if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
3033             *value!= '\0' && strcmp(value, "\"\"") != 0) {
3034         // abort if -Djava.endorsed.dirs is set
3035         jio_fprintf(defaultStream::output_stream(),
3036           "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
3037           "in modular form will be supported via the concept of upgradeable modules.\n", value);
3038         return JNI_EINVAL;
3039       }
3040       if (match_option(option, "-Djava.ext.dirs=", &value) &&
3041             *value != '\0' && strcmp(value, "\"\"") != 0) {
3042         // abort if -Djava.ext.dirs is set
3043         jio_fprintf(defaultStream::output_stream(),
3044           "-Djava.ext.dirs=%s is not supported.  Use -classpath instead.\n", value);
3045         return JNI_EINVAL;
3046       }
3047 
3048       if (!add_property(tail)) {
3049         return JNI_ENOMEM;
3050       }
3051       // Out of the box management support
3052       if (match_option(option, "-Dcom.sun.management", &tail)) {
3053 #if INCLUDE_MANAGEMENT
3054         FLAG_SET_CMDLINE(bool, ManagementServer, true);
3055 #else
3056         jio_fprintf(defaultStream::output_stream(),
3057           "-Dcom.sun.management is not supported in this VM.\n");
3058         return JNI_ERR;
3059 #endif
3060       }
3061     // -Xint
3062     } else if (match_option(option, "-Xint")) {
3063           set_mode_flags(_int);
3064     // -Xmixed
3065     } else if (match_option(option, "-Xmixed")) {
3066           set_mode_flags(_mixed);
3067     // -Xcomp
3068     } else if (match_option(option, "-Xcomp")) {
3069       // for testing the compiler; turn off all flags that inhibit compilation
3070           set_mode_flags(_comp);
3071     // -Xshare:dump
3072     } else if (match_option(option, "-Xshare:dump")) {
3073       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3074       set_mode_flags(_int);     // Prevent compilation, which creates objects
3075     // -Xshare:on
3076     } else if (match_option(option, "-Xshare:on")) {
3077       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3078       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3079     // -Xshare:auto
3080     } else if (match_option(option, "-Xshare:auto")) {
3081       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3082       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3083     // -Xshare:off
3084     } else if (match_option(option, "-Xshare:off")) {
3085       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3086       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3087     // -Xverify
3088     } else if (match_option(option, "-Xverify", &tail)) {
3089       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3090         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3091         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3092       } else if (strcmp(tail, ":remote") == 0) {
3093         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3094         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3095       } else if (strcmp(tail, ":none") == 0) {
3096         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3097         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3098       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3099         return JNI_EINVAL;
3100       }
3101     // -Xdebug
3102     } else if (match_option(option, "-Xdebug")) {
3103       // note this flag has been used, then ignore
3104       set_xdebug_mode(true);
3105     // -Xnoagent
3106     } else if (match_option(option, "-Xnoagent")) {
3107       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3108     } else if (match_option(option, "-Xboundthreads")) {
3109       // Ignore silently for compatibility
3110     } else if (match_option(option, "-Xloggc:", &tail)) {
3111       // Redirect GC output to the file. -Xloggc:<filename>
3112       // ostream_init_log(), when called will use this filename
3113       // to initialize a fileStream.
3114       _gc_log_filename = os::strdup_check_oom(tail);
3115      if (!is_filename_valid(_gc_log_filename)) {
3116        jio_fprintf(defaultStream::output_stream(),
3117                   "Invalid file name for use with -Xloggc: Filename can only contain the "
3118                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3119                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
3120         return JNI_EINVAL;
3121       }
3122       FLAG_SET_CMDLINE(bool, PrintGC, true);
3123       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3124 
3125     // JNI hooks
3126     } else if (match_option(option, "-Xcheck", &tail)) {
3127       if (!strcmp(tail, ":jni")) {
3128 #if !INCLUDE_JNI_CHECK
3129         warning("JNI CHECKING is not supported in this VM");
3130 #else
3131         CheckJNICalls = true;
3132 #endif // INCLUDE_JNI_CHECK
3133       } else if (is_bad_option(option, args->ignoreUnrecognized,
3134                                      "check")) {
3135         return JNI_EINVAL;
3136       }
3137     } else if (match_option(option, "vfprintf")) {
3138       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3139     } else if (match_option(option, "exit")) {
3140       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3141     } else if (match_option(option, "abort")) {
3142       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3143     // -XX:+AggressiveHeap
3144     } else if (match_option(option, "-XX:+AggressiveHeap")) {
3145 
3146       // This option inspects the machine and attempts to set various
3147       // parameters to be optimal for long-running, memory allocation
3148       // intensive jobs.  It is intended for machines with large
3149       // amounts of cpu and memory.
3150 
3151       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3152       // VM, but we may not be able to represent the total physical memory
3153       // available (like having 8gb of memory on a box but using a 32bit VM).
3154       // Thus, we need to make sure we're using a julong for intermediate
3155       // calculations.
3156       julong initHeapSize;
3157       julong total_memory = os::physical_memory();
3158 
3159       if (total_memory < (julong)256*M) {
3160         jio_fprintf(defaultStream::error_stream(),
3161                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3162         vm_exit(1);
3163       }
3164 
3165       // The heap size is half of available memory, or (at most)
3166       // all of possible memory less 160mb (leaving room for the OS
3167       // when using ISM).  This is the maximum; because adaptive sizing
3168       // is turned on below, the actual space used may be smaller.
3169 
3170       initHeapSize = MIN2(total_memory / (julong)2,
3171                           total_memory - (julong)160*M);
3172 
3173       initHeapSize = limit_by_allocatable_memory(initHeapSize);
3174 
3175       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3176          FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize);
3177          FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize);
3178          // Currently the minimum size and the initial heap sizes are the same.
3179          set_min_heap_size(initHeapSize);
3180       }
3181       if (FLAG_IS_DEFAULT(NewSize)) {
3182          // Make the young generation 3/8ths of the total heap.
3183          FLAG_SET_CMDLINE(size_t, NewSize,
3184                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3185          FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize);
3186       }
3187 
3188 #if !defined(_ALLBSD_SOURCE) && !defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
3189       FLAG_SET_DEFAULT(UseLargePages, true);
3190 #endif
3191 
3192       // Increase some data structure sizes for efficiency
3193       FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize);
3194       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3195       FLAG_SET_CMDLINE(size_t, TLABSize, 256*K);
3196 
3197       // See the OldPLABSize comment below, but replace 'after promotion'
3198       // with 'after copying'.  YoungPLABSize is the size of the survivor
3199       // space per-gc-thread buffers.  The default is 4kw.
3200       FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K);      // Note: this is in words
3201 
3202       // OldPLABSize is the size of the buffers in the old gen that
3203       // UseParallelGC uses to promote live data that doesn't fit in the
3204       // survivor spaces.  At any given time, there's one for each gc thread.
3205       // The default size is 1kw. These buffers are rarely used, since the
3206       // survivor spaces are usually big enough.  For specjbb, however, there
3207       // are occasions when there's lots of live data in the young gen
3208       // and we end up promoting some of it.  We don't have a definite
3209       // explanation for why bumping OldPLABSize helps, but the theory
3210       // is that a bigger PLAB results in retaining something like the
3211       // original allocation order after promotion, which improves mutator
3212       // locality.  A minor effect may be that larger PLABs reduce the
3213       // number of PLAB allocation events during gc.  The value of 8kw
3214       // was arrived at by experimenting with specjbb.
3215       FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K);  // Note: this is in words
3216 
3217       // Enable parallel GC and adaptive generation sizing
3218       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3219       FLAG_SET_DEFAULT(ParallelGCThreads,
3220                        Abstract_VM_Version::parallel_worker_threads());
3221 
3222       // Encourage steady state memory management
3223       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3224 
3225       // This appears to improve mutator locality
3226       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3227 
3228       // Get around early Solaris scheduling bug
3229       // (affinity vs other jobs on system)
3230       // but disallow DR and offlining (5008695).
3231       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3232 
3233     // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3234     // and the last option wins.
3235     } else if (match_option(option, "-XX:+NeverTenure")) {
3236       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3237       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3238       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3239     } else if (match_option(option, "-XX:+AlwaysTenure")) {
3240       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3241       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3242       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3243     } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3244       uintx max_tenuring_thresh = 0;
3245       if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3246         jio_fprintf(defaultStream::error_stream(),
3247           "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail);
3248         return JNI_EINVAL;
3249       }
3250       FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3251 
3252       if (MaxTenuringThreshold == 0) {
3253         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3254         FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3255       } else {
3256         FLAG_SET_CMDLINE(bool, NeverTenure, false);
3257         FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3258       }
3259     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3260       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3261       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3262     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3263       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3264       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3265     } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3266 #if defined(DTRACE_ENABLED)
3267       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3268       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3269       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3270       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3271 #else // defined(DTRACE_ENABLED)
3272       jio_fprintf(defaultStream::error_stream(),
3273                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3274       return JNI_EINVAL;
3275 #endif // defined(DTRACE_ENABLED)
3276 #ifdef ASSERT
3277     } else if (match_option(option, "-XX:+FullGCALot")) {
3278       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3279       // disable scavenge before parallel mark-compact
3280       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3281 #endif
3282     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3283                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3284       julong stack_size = 0;
3285       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3286       if (errcode != arg_in_range) {
3287         jio_fprintf(defaultStream::error_stream(),
3288                     "Invalid mark stack size: %s\n", option->optionString);
3289         describe_range_error(errcode);
3290         return JNI_EINVAL;
3291       }
3292       jio_fprintf(defaultStream::error_stream(),
3293         "Please use -XX:MarkStackSize in place of "
3294         "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3295       FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size);
3296     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3297       julong max_stack_size = 0;
3298       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3299       if (errcode != arg_in_range) {
3300         jio_fprintf(defaultStream::error_stream(),
3301                     "Invalid maximum mark stack size: %s\n",
3302                     option->optionString);
3303         describe_range_error(errcode);
3304         return JNI_EINVAL;
3305       }
3306       jio_fprintf(defaultStream::error_stream(),
3307          "Please use -XX:MarkStackSizeMax in place of "
3308          "-XX:CMSMarkStackSizeMax in the future\n");
3309       FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size);
3310     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3311                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3312       uintx conc_threads = 0;
3313       if (!parse_uintx(tail, &conc_threads, 1)) {
3314         jio_fprintf(defaultStream::error_stream(),
3315                     "Invalid concurrent threads: %s\n", option->optionString);
3316         return JNI_EINVAL;
3317       }
3318       jio_fprintf(defaultStream::error_stream(),
3319         "Please use -XX:ConcGCThreads in place of "
3320         "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3321       FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads);
3322     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3323       julong max_direct_memory_size = 0;
3324       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3325       if (errcode != arg_in_range) {
3326         jio_fprintf(defaultStream::error_stream(),
3327                     "Invalid maximum direct memory size: %s\n",
3328                     option->optionString);
3329         describe_range_error(errcode);
3330         return JNI_EINVAL;
3331       }
3332       FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size);
3333 #if !INCLUDE_MANAGEMENT
3334     } else if (match_option(option, "-XX:+ManagementServer")) {
3335         jio_fprintf(defaultStream::error_stream(),
3336           "ManagementServer is not supported in this VM.\n");
3337         return JNI_ERR;
3338 #endif // INCLUDE_MANAGEMENT
3339     // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3340     } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3341       FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true);
3342       jio_fprintf(defaultStream::output_stream(),
3343           "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3344     } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3345       FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false);
3346       jio_fprintf(defaultStream::output_stream(),
3347           "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3348     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3349       // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3350       // already been handled
3351       if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3352           (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3353         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3354           return JNI_EINVAL;
3355         }
3356       }
3357     // Unknown option
3358     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3359       return JNI_ERR;
3360     }
3361   }
3362 
3363   // PrintSharedArchiveAndExit will turn on
3364   //   -Xshare:on
3365   //   -XX:+TraceClassPaths
3366   if (PrintSharedArchiveAndExit) {
3367     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3368     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3369     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3370   }
3371 
3372   // Change the default value for flags  which have different default values
3373   // when working with older JDKs.
3374 #ifdef LINUX
3375  if (JDK_Version::current().compare_major(6) <= 0 &&
3376       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3377     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3378   }
3379 #endif // LINUX
3380   fix_appclasspath();
3381   return JNI_OK;
3382 }
3383 
3384 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3385 //
3386 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3387 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3388 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3389 // path is treated as the current directory.
3390 //
3391 // This causes problems with CDS, which requires that all directories specified in the classpath
3392 // must be empty. In most cases, applications do NOT want to load classes from the current
3393 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3394 // scripts compatible with CDS.
3395 void Arguments::fix_appclasspath() {
3396   if (IgnoreEmptyClassPaths) {
3397     const char separator = *os::path_separator();
3398     const char* src = _java_class_path->value();
3399 
3400     // skip over all the leading empty paths
3401     while (*src == separator) {
3402       src ++;
3403     }
3404 
3405     char* copy = os::strdup_check_oom(src, mtInternal);
3406 
3407     // trim all trailing empty paths
3408     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3409       *tail = '\0';
3410     }
3411 
3412     char from[3] = {separator, separator, '\0'};
3413     char to  [2] = {separator, '\0'};
3414     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3415       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3416       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3417     }
3418 
3419     _java_class_path->set_value(copy);
3420     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3421   }
3422 
3423   if (!PrintSharedArchiveAndExit) {
3424     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3425   }
3426 }
3427 
3428 static bool has_jar_files(const char* directory) {
3429   DIR* dir = os::opendir(directory);
3430   if (dir == NULL) return false;
3431 
3432   struct dirent *entry;
3433   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3434   bool hasJarFile = false;
3435   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3436     const char* name = entry->d_name;
3437     const char* ext = name + strlen(name) - 4;
3438     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3439   }
3440   FREE_C_HEAP_ARRAY(char, dbuf);
3441   os::closedir(dir);
3442   return hasJarFile ;
3443 }
3444 
3445 static int check_non_empty_dirs(const char* path) {
3446   const char separator = *os::path_separator();
3447   const char* const end = path + strlen(path);
3448   int nonEmptyDirs = 0;
3449   while (path < end) {
3450     const char* tmp_end = strchr(path, separator);
3451     if (tmp_end == NULL) {
3452       if (has_jar_files(path)) {
3453         nonEmptyDirs++;
3454         jio_fprintf(defaultStream::output_stream(),
3455           "Non-empty directory: %s\n", path);
3456       }
3457       path = end;
3458     } else {
3459       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3460       memcpy(dirpath, path, tmp_end - path);
3461       dirpath[tmp_end - path] = '\0';
3462       if (has_jar_files(dirpath)) {
3463         nonEmptyDirs++;
3464         jio_fprintf(defaultStream::output_stream(),
3465           "Non-empty directory: %s\n", dirpath);
3466       }
3467       FREE_C_HEAP_ARRAY(char, dirpath);
3468       path = tmp_end + 1;
3469     }
3470   }
3471   return nonEmptyDirs;
3472 }
3473 
3474 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3475   // check if the default lib/endorsed directory exists; if so, error
3476   char path[JVM_MAXPATHLEN];
3477   const char* fileSep = os::file_separator();
3478   sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3479 
3480   if (CheckEndorsedAndExtDirs) {
3481     int nonEmptyDirs = 0;
3482     // check endorsed directory
3483     nonEmptyDirs += check_non_empty_dirs(path);
3484     // check the extension directories
3485     nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3486     if (nonEmptyDirs > 0) {
3487       return JNI_ERR;
3488     }
3489   }
3490 
3491   DIR* dir = os::opendir(path);
3492   if (dir != NULL) {
3493     jio_fprintf(defaultStream::output_stream(),
3494       "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3495       "in modular form will be supported via the concept of upgradeable modules.\n");
3496     os::closedir(dir);
3497     return JNI_ERR;
3498   }
3499 
3500   sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3501   dir = os::opendir(path);
3502   if (dir != NULL) {
3503     jio_fprintf(defaultStream::output_stream(),
3504       "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3505       "Use -classpath instead.\n.");
3506     os::closedir(dir);
3507     return JNI_ERR;
3508   }
3509 
3510   if (scp_assembly_required) {
3511     // Assemble the bootclasspath elements into the final path.
3512     Arguments::set_sysclasspath(scp_p->combined_path());
3513   }
3514 
3515   // This must be done after all arguments have been processed.
3516   // java_compiler() true means set to "NONE" or empty.
3517   if (java_compiler() && !xdebug_mode()) {
3518     // For backwards compatibility, we switch to interpreted mode if
3519     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3520     // not specified.
3521     set_mode_flags(_int);
3522   }
3523 
3524   // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3525   // but like -Xint, leave compilation thresholds unaffected.
3526   // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3527   if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3528     set_mode_flags(_int);
3529   }
3530 
3531   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3532   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3533     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3534   }
3535 
3536 #ifndef COMPILER2
3537   // Don't degrade server performance for footprint
3538   if (FLAG_IS_DEFAULT(UseLargePages) &&
3539       MaxHeapSize < LargePageHeapSizeThreshold) {
3540     // No need for large granularity pages w/small heaps.
3541     // Note that large pages are enabled/disabled for both the
3542     // Java heap and the code cache.
3543     FLAG_SET_DEFAULT(UseLargePages, false);
3544   }
3545 
3546 #else
3547   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3548     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3549   }
3550 #endif
3551 
3552 #ifndef TIERED
3553   // Tiered compilation is undefined.
3554   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3555 #endif
3556 
3557   // If we are running in a headless jre, force java.awt.headless property
3558   // to be true unless the property has already been set.
3559   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3560   if (os::is_headless_jre()) {
3561     const char* headless = Arguments::get_property("java.awt.headless");
3562     if (headless == NULL) {
3563       const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3564       if (headless_env == NULL) {
3565         if (!add_property("java.awt.headless=true")) {
3566           return JNI_ENOMEM;
3567         }
3568       } else {
3569         char buffer[256];
3570         jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3571         if (!add_property(buffer)) {
3572           return JNI_ENOMEM;
3573         }
3574       }
3575     }
3576   }
3577 
3578   if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3579     // CMS can only be used with ParNew
3580     FLAG_SET_ERGO(bool, UseParNewGC, true);
3581   }
3582 
3583   if (!check_vm_args_consistency()) {
3584     return JNI_ERR;
3585   }
3586 
3587   return JNI_OK;
3588 }
3589 
3590 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3591   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3592                                             scp_assembly_required_p);
3593 }
3594 
3595 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3596   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3597                                             scp_assembly_required_p);
3598 }
3599 
3600 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3601   char *buffer = ::getenv(name);
3602 
3603   // Don't check this variable if user has special privileges
3604   // (e.g. unix su command).
3605   if (buffer == NULL || os::have_special_privileges()) {
3606     return JNI_OK;
3607   }
3608 
3609   if ((buffer = os::strdup(buffer)) == NULL) {
3610     return JNI_ENOMEM;
3611   }
3612 
3613   GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true);    // Construct option array
3614   jio_fprintf(defaultStream::error_stream(),
3615               "Picked up %s: %s\n", name, buffer);
3616   char* rd = buffer;                        // pointer to the input string (rd)
3617   while (true) {                            // repeat for all options in the input string
3618     while (isspace(*rd)) rd++;              // skip whitespace
3619     if (*rd == 0) break;                    // we re done when the input string is read completely
3620 
3621     // The output, option string, overwrites the input string.
3622     // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3623     // input string (rd).
3624     char* wrt = rd;
3625 
3626     JavaVMOption option;
3627     option.optionString = wrt;
3628     options->append(option);                // Fill in option
3629     while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3630       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3631         int quote = *rd;                    // matching quote to look for
3632         rd++;                               // don't copy open quote
3633         while (*rd != quote) {              // include everything (even spaces) up until quote
3634           if (*rd == 0) {                   // string termination means unmatched string
3635             jio_fprintf(defaultStream::error_stream(),
3636                         "Unmatched quote in %s\n", name);
3637             delete options;
3638             os::free(buffer);
3639             return JNI_ERR;
3640           }
3641           *wrt++ = *rd++;                   // copy to option string
3642         }
3643         rd++;                               // don't copy close quote
3644       } else {
3645         *wrt++ = *rd++;                     // copy to option string
3646       }
3647     }
3648     // Need to check if we're done before writing a NULL,
3649     // because the write could be to the byte that rd is pointing to.
3650     if (*rd++ == 0) {
3651       *wrt = 0;
3652       break;
3653     }
3654     *wrt = 0;                               // Zero terminate option
3655   }
3656   JavaVMOption* options_arr =
3657       NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3658   if (options_arr == NULL) {
3659     delete options;
3660     os::free(buffer);
3661     return JNI_ENOMEM;
3662   }
3663   for (int i = 0; i < options->length(); i++) {
3664     options_arr[i] = options->at(i);
3665   }
3666 
3667   // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3668   JavaVMInitArgs vm_args;
3669   vm_args.version = JNI_VERSION_1_2;
3670   vm_args.options = options_arr;
3671   vm_args.nOptions = options->length();
3672   vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3673 
3674   if (PrintVMOptions) {
3675     const char* tail;
3676     for (int i = 0; i < vm_args.nOptions; i++) {
3677       const JavaVMOption *option = vm_args.options + i;
3678       if (match_option(option, "-XX:", &tail)) {
3679         logOption(tail);
3680       }
3681     }
3682   }
3683 
3684   jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3685                                        Flag::ENVIRON_VAR);
3686   FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3687   delete options;
3688   os::free(buffer);
3689   return result;
3690 }
3691 
3692 void Arguments::set_shared_spaces_flags() {
3693   if (DumpSharedSpaces) {
3694     if (RequireSharedSpaces) {
3695       warning("cannot dump shared archive while using shared archive");
3696     }
3697     UseSharedSpaces = false;
3698 #ifdef _LP64
3699     if (!UseCompressedOops || !UseCompressedClassPointers) {
3700       vm_exit_during_initialization(
3701         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3702     }
3703   } else {
3704     if (!UseCompressedOops || !UseCompressedClassPointers) {
3705       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3706     }
3707 #endif
3708   }
3709 }
3710 
3711 #if !INCLUDE_ALL_GCS
3712 static void force_serial_gc() {
3713   FLAG_SET_DEFAULT(UseSerialGC, true);
3714   UNSUPPORTED_GC_OPTION(UseG1GC);
3715   UNSUPPORTED_GC_OPTION(UseParallelGC);
3716   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3717   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3718   UNSUPPORTED_GC_OPTION(UseParNewGC);
3719 }
3720 #endif // INCLUDE_ALL_GCS
3721 
3722 // Sharing support
3723 // Construct the path to the archive
3724 static char* get_shared_archive_path() {
3725   char *shared_archive_path;
3726   if (SharedArchiveFile == NULL) {
3727     char jvm_path[JVM_MAXPATHLEN];
3728     os::jvm_path(jvm_path, sizeof(jvm_path));
3729     char *end = strrchr(jvm_path, *os::file_separator());
3730     if (end != NULL) *end = '\0';
3731     size_t jvm_path_len = strlen(jvm_path);
3732     size_t file_sep_len = strlen(os::file_separator());
3733     const size_t len = jvm_path_len + file_sep_len + 20;
3734     shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3735     if (shared_archive_path != NULL) {
3736       jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3737         jvm_path, os::file_separator());
3738     }
3739   } else {
3740     shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3741   }
3742   return shared_archive_path;
3743 }
3744 
3745 #ifndef PRODUCT
3746 // Determine whether LogVMOutput should be implicitly turned on.
3747 static bool use_vm_log() {
3748   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3749       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3750       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3751       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3752       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3753     return true;
3754   }
3755 
3756 #ifdef COMPILER1
3757   if (PrintC1Statistics) {
3758     return true;
3759   }
3760 #endif // COMPILER1
3761 
3762 #ifdef COMPILER2
3763   if (PrintOptoAssembly || PrintOptoStatistics) {
3764     return true;
3765   }
3766 #endif // COMPILER2
3767 
3768   return false;
3769 }
3770 #endif // PRODUCT
3771 
3772 jint Arguments::alloc_JVM_options_list(const int needed_slots,
3773                                        const int version,
3774                                        struct JavaVMInitArgs **ret_args_head) {
3775   assert(needed_slots > 0, "needed_slots must greater than zero");
3776   assert(ret_args_head != NULL, "ret_args_head must not be NULL");
3777 
3778   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3779                               "Allocating %d option slots\n", needed_slots));
3780   JavaVMInitArgs *new_args_head =
3781       (JavaVMInitArgs *) os::malloc(sizeof (JavaVMInitArgs), mtInternal);
3782   if (new_args_head == NULL) {
3783     jio_fprintf(defaultStream::error_stream(),
3784                 "Could not allocate arguments list head\n");
3785     return JNI_ENOMEM;
3786   }
3787 
3788   memset(new_args_head, 0, sizeof (struct JavaVMInitArgs));
3789 
3790   int bytes_needed = needed_slots * (sizeof (struct JavaVMOption));
3791   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3792                               "to allocate options list %d %d\n",
3793                               needed_slots, bytes_needed));
3794 
3795   JavaVMOption *new_options_head =
3796       (struct JavaVMOption *) os::malloc(bytes_needed, mtInternal);
3797 
3798   if (new_options_head == NULL) {
3799     jio_fprintf(defaultStream::error_stream(),
3800                 "Could not allocate options list with %d entries"
3801                 " and %d bytes\n",
3802                 needed_slots, bytes_needed);
3803 
3804     os::free(new_args_head);
3805     new_args_head = NULL;
3806 
3807     return JNI_ENOMEM;
3808   }
3809 
3810   memset(new_options_head, 0, bytes_needed);
3811 
3812   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3813                               "allocation need for options list %d %d\n",
3814                               needed_slots, bytes_needed));
3815 
3816   // Assemble the args object
3817   new_args_head->options = new_options_head;
3818   new_args_head->nOptions = 0;
3819   new_args_head->version = version;
3820 
3821   // Return newly allocated but not populated options list
3822   *ret_args_head = new_args_head;
3823 
3824   return JNI_OK;
3825 }
3826 
3827 // Copy num_slots NULL separated JVM options from buffer to
3828 // new_options[0] through new_options[num_slots - 1].
3829 // The byte_cnt includes null termination.
3830 jint Arguments::copy_JVM_options_from_buf(const char *buffer,
3831                                           const size_t byte_cnt,
3832                                           const int num_slots,
3833                                           int *cur_slot_p,
3834                                           struct JavaVMOption *new_options) {
3835 
3836   assert(buffer != NULL, "buffer must not be NULL");
3837   assert(byte_cnt > 1, "byte_cnt must be greater than one");
3838   assert(num_slots > 0, "num_slots must be greater than zero");
3839   assert(cur_slot_p != NULL, "cur_slot_p must not be NULL");
3840   assert(new_options != NULL, "new_options must not be NULL");
3841 
3842   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3843                               "Copying %d options from buffer\n",
3844                               num_slots));
3845   (*cur_slot_p) = 0;
3846   const char *head = buffer;
3847   const char *tail = buffer + byte_cnt - 1;
3848 
3849   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3850                               "Copying option %d %d %d\n",
3851                               byte_cnt, *cur_slot_p, num_slots));
3852 
3853   while ((head < tail) && (*cur_slot_p < num_slots)) {
3854     // Skip null character separator(s)
3855     while ((head < tail) && (*head == '\0')) {
3856       head++;
3857     }
3858 
3859     if (head >= tail) {
3860       break;
3861     }
3862 
3863     // save a copy of the string in the options list
3864     new_options[(*cur_slot_p)].optionString =
3865         os::strdup_check_oom(head, mtInternal);
3866 
3867     if (new_options[(*cur_slot_p)].optionString == NULL) {
3868       jio_fprintf(defaultStream::error_stream(),
3869                   "Could not copy file option string '%s'\n", head);
3870       return JNI_ENOMEM;
3871     }
3872 
3873     DumpOption(new_options, *cur_slot_p, "copy");
3874     const char *dummy;
3875     if (match_option(&new_options[(*cur_slot_p)],
3876                      "-XX:VMOptionsFile=", &dummy)) {
3877       jio_fprintf(defaultStream::error_stream(),
3878                   "VM options file is only supported on the command line\n");
3879 
3880       (*cur_slot_p)++;  // We do not need this slot, but count it on the
3881                         // list so the error handling can clean this up
3882       return JNI_EINVAL;
3883     }
3884 
3885     JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3886                                 "Copying option %d %d %s\n",
3887                                 *cur_slot_p,
3888                                 num_slots,
3889                                 new_options[(*cur_slot_p)].optionString));
3890     (*cur_slot_p)++;  // Done with current slot
3891 
3892     while ((head < tail) && (*head != '\0')) {
3893       head++;
3894     }
3895   }
3896 
3897   return JNI_OK;
3898 }
3899 
3900 // Parse the JVM options from file_name into ret_buff. The
3901 // options in ret_buff are NULL separated in order to preserve
3902 // any embedded white space that was quoted in file_name.
3903 jint Arguments::parse_JVM_options_file(const char *file_name,
3904                                        char **ret_buff,
3905                                        size_t *ret_bytes,
3906                                        int *ret_opt_cnt) {
3907 
3908   assert(file_name != NULL, "file_name must not be NULL.");
3909   assert(ret_buff != NULL, "ret_buff must not be NULL.");
3910   assert(ret_bytes != NULL, "ret_bytes must not be NULL.");
3911   assert(ret_opt_cnt != NULL, "ret_opt_cnt must not be NULL.");
3912 
3913   // Default all return params to not return data
3914   *ret_buff = NULL;
3915   *ret_bytes = 0;
3916   *ret_opt_cnt = 0;
3917 
3918   int fd = ::open(file_name, O_RDONLY);
3919   if (fd < 0) {
3920     jio_fprintf(defaultStream::error_stream(),
3921                 "Could not open options file '%s'\n",
3922                 file_name);
3923     return JNI_ERR;
3924   }
3925 
3926   // '+ 1' for NULL termination even with max bytes
3927   int bytes_alloc = OPTION_BUFFER_SIZE + 1;
3928 
3929   char *buf = (char *)os::malloc(bytes_alloc, mtInternal);
3930 
3931   if (buf == NULL) {
3932     jio_fprintf(defaultStream::error_stream(),
3933                 "Could not allocate read buffer for options file parse\n");
3934     os::close(fd);
3935     return JNI_ENOMEM;
3936   }
3937 
3938   memset(buf, 0, (unsigned)bytes_alloc);
3939 
3940   // Fill buffer
3941   // Use ::read() instead of os::read because os::read()
3942   // might do a thead state transition
3943   // and it is too early for that here
3944 
3945   int bytes_read = ::read(fd, (void *)buf,
3946                           (unsigned)bytes_alloc);
3947   if (bytes_read < 0) {
3948     os::free(buf);
3949     buf = NULL;
3950     os::close(fd);
3951     jio_fprintf(defaultStream::error_stream(),
3952                 "Could not read options file '%s'\n", file_name);
3953     return JNI_ERR;
3954   }
3955 
3956   if (bytes_read == 0) {
3957     // tell caller there is no option data and that is ok
3958     os::free(buf);
3959     buf = NULL;
3960     os::close(fd);
3961     return JNI_OK;
3962   }
3963 
3964   // file is larger than OPTION_BUFFER_SIZE
3965   if (bytes_read > bytes_alloc - 1) {
3966     os::free(buf);
3967     buf = NULL;
3968     os::close(fd);
3969     jio_fprintf(defaultStream::error_stream(),
3970                 "Options file '%s' is larger than %d bytes.\n",
3971                 file_name, bytes_alloc - 1);
3972     return JNI_EINVAL;
3973   }
3974 
3975   os::close(fd);
3976 
3977   // some pointers to help with parsing
3978   char *buf_end = buf + bytes_read;
3979   char *cur_token_head = buf;
3980   char *wrt = buf;
3981   char *rd = buf;
3982 
3983   // count tokens
3984   int token_cnt = 0;
3985 
3986   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3987                               "Parse buf loop > '%s'\n",
3988                               buf));
3989   // parse all options
3990   while (rd < buf_end) {
3991     JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
3992                                 "Parse buf loop white > >%s<\n", rd));
3993     // skip leading white space from the input string
3994     while (rd < buf_end && iswhite(*rd)) {
3995       rd++;
3996     }
3997 
3998     if (rd >= buf_end) {
3999       break;
4000     }
4001 
4002     JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4003                                 "Parse next token > %s\n", rd));
4004     // Remember this is where we found the head of the token.
4005     cur_token_head = wrt;
4006 
4007     // Tokens are strings of non white space characters separated
4008     // by one or more white spaces.
4009     while (rd < buf_end && !iswhite(*rd)) {
4010       if (*rd == '\'' || *rd == '"') {      // handle a quoted string
4011         int quote = *rd;                    // matching quote to look for
4012         rd++;                               // don't copy open quote
4013         while (rd < buf_end && *rd != quote) {
4014                                             // include everything (even spaces)
4015                                             // up until the close quote
4016           *wrt++ = *rd++;                   // copy to option string
4017         }
4018 
4019         if (rd < buf_end) {
4020           rd++;                             // don't copy close quote
4021         } else {
4022                                             // did not see closing quote
4023           jio_fprintf(defaultStream::error_stream(),
4024                       "Unmatched quote in '%s'\n", file_name);
4025           os::free(buf);
4026           buf = NULL;
4027           return JNI_EINVAL;
4028         }
4029       } else {
4030         *wrt++ = *rd++;                     // copy to option string
4031       }
4032     }
4033 
4034     // steal a white space character and set it to NULL
4035     *wrt++ = '\0';
4036     token_cnt++;
4037     // We now have a complete token
4038     JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4039                                 "Current parsed token > %s\n",
4040                                 cur_token_head));
4041 
4042     rd++;  // Advance to next character
4043   }
4044 
4045   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4046                               "Done parsing tokens > %d\n",
4047                               token_cnt));
4048 
4049   if (token_cnt > N_MAX_OPTIONS) {
4050     jio_fprintf(defaultStream::error_stream(),
4051                 "Options file has more than %d options.\n",
4052                 N_MAX_OPTIONS);
4053     os::free(buf);
4054     buf = NULL;
4055     return JNI_EINVAL;
4056   }
4057 
4058   // Pass the data the back to the caller
4059   *ret_buff = buf;
4060   *ret_opt_cnt = token_cnt;
4061   *ret_bytes = (size_t)(wrt - buf);
4062 
4063   return JNI_OK;
4064 }
4065 
4066 // Merge options from a JVM options file with the options provided
4067 // by argsin and return the merge results via *argsout. If the
4068 // '-XX:VMOptionsFile=...' option is not specified on the command
4069 // line, then there is nothing to merge and *argsout is set to NULL.
4070 jint Arguments::merge_JVM_options_file(const JavaVMInitArgs *argsin,
4071                                        JavaVMInitArgs **argsout) {
4072 
4073   assert(argsin != NULL, "argsin should not be NULL");
4074   assert(argsout != NULL, "argsout should not be NULL");
4075 
4076   JavaVMInitArgs *new_args_head = NULL;
4077   char *options_file = NULL;
4078   bool options_file_found = false;
4079 
4080   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4081                               "Found %d existing option(s)\n",
4082                               argsin->nOptions));
4083 
4084   // Take a peak at options passed in, looking for an options file
4085   int old_index = 0;
4086   const char *tail = NULL;
4087   while (old_index < argsin->nOptions) {
4088     JavaVMOption *option = argsin->options + old_index;
4089 
4090     JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4091                                 "Found existing option %s\n",
4092                                 option->optionString));
4093 
4094     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4095       // Only one options file allowed on the command line.
4096       if (options_file_found) {
4097         jio_fprintf(defaultStream::error_stream(),
4098                     "Only one VM Options file is supported "
4099                     "on the command line\n");
4100 
4101         *argsout = NULL;
4102         os::free(options_file);
4103         options_file = NULL;
4104         return JNI_EINVAL;
4105       } else {
4106         options_file_found = true;
4107       }
4108       options_file = os::strdup_check_oom(tail, mtInternal);
4109       if (options_file == NULL) {
4110         jio_fprintf(defaultStream::error_stream(),
4111                     "Could not copy options file path\n");
4112 
4113         return JNI_ENOMEM;
4114       }
4115     }
4116     old_index++;
4117   }
4118 
4119   // No option file specified so nothing more to do
4120   if (options_file == NULL) {
4121     *argsout = NULL;
4122     return JNI_OK;
4123   }
4124 
4125   DumpVMOptions(argsin, "Premerge");
4126 
4127   char *buff;            // Contents of the options file
4128   size_t byte_cnt = 0;   // bytes in buffer
4129   int file_slots = 0;    // # options found in file
4130 
4131   // We have requested an options file, so we need to read it
4132   // and do a simple white space parse on it.
4133   jint result = parse_JVM_options_file(options_file,
4134                                        &buff,
4135                                        &byte_cnt,
4136                                        &file_slots);
4137   if (result != JNI_OK) {
4138     // the option file processing failed
4139     jio_fprintf(defaultStream::error_stream(),
4140                 "Options file '%s', parsing error\n",
4141                 options_file);
4142 
4143     os::free(options_file);
4144     options_file = NULL;
4145     *argsout = NULL;
4146     return result;
4147   }
4148 
4149   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4150                               "Found %d bytes and %d options\n",
4151                               byte_cnt, file_slots));
4152   // no options but that is ok
4153   if (file_slots == 0) {
4154     os::free(options_file);
4155     options_file = NULL;
4156     *argsout = NULL;
4157     return JNI_OK;
4158   }
4159 
4160   // Combine cmd line slot count and the options file slots passed to us
4161   // We need one less because the "-XX:VMOptionsFile" is not included
4162   // in the new list. 
4163   int num_slots = argsin->nOptions + file_slots - 1;
4164 
4165   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4166                               "Allocate option list with %d slots, %d file,"
4167                               " %d exist\n",
4168                               num_slots, file_slots, argsin->nOptions));
4169 
4170   // Allocate a new option list
4171   result = Arguments::alloc_JVM_options_list(num_slots, argsin->version,
4172                                              &new_args_head);
4173   if (result != JNI_OK) {
4174     // the option file processing failed
4175     jio_fprintf(defaultStream::error_stream(),
4176                 "Memory error in options processing\n");
4177     os::free(buff);
4178     buff = NULL;
4179     os::free(options_file);
4180     options_file = NULL;
4181     *argsout = NULL;
4182     return result;
4183   }
4184 
4185   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4186                               "merge option list > %d %d\n",
4187                               argsin->nOptions, num_slots));
4188 
4189   old_index = 0;
4190   while ((old_index < argsin->nOptions) &&
4191          (new_args_head->nOptions < num_slots)) {
4192 
4193     JavaVMOption *old_option_p = argsin->options + old_index;
4194     JavaVMOption *new_option_p = new_args_head->options +
4195                                  new_args_head->nOptions;
4196 
4197     JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4198                                 "Merge option %s old %d new %d\n",
4199                                 old_option_p->optionString,
4200                                 old_index, new_args_head->nOptions));
4201 
4202     // Allow the VM option tracing to come on early.
4203     if (match_option(old_option_p, "-XX:+PrintVMOptions")) {
4204       PrintVMOptions = true;
4205     }
4206 
4207     if (match_option(old_option_p, "-XX:VMOptionsFile=", &tail)) {
4208       int file_slots_used = 0;
4209       result = Arguments::copy_JVM_options_from_buf(buff,
4210                                                     byte_cnt,
4211                                                     file_slots,
4212                                                     &file_slots_used,
4213                                                     new_option_p);
4214       // Update option count for success and failure.
4215       // The initialized count is required to free the new args object
4216       new_args_head->nOptions += file_slots_used;
4217 
4218       if (result != JNI_OK) {
4219         // the option file processing failed
4220         jio_fprintf(defaultStream::error_stream(),
4221                     "Options copy error '%s'\n",
4222                     options_file);
4223 
4224         os::free(buff);
4225         buff = NULL;
4226         os::free(options_file);
4227         options_file = NULL;
4228         FreeVMOptions(&new_args_head, argsin);
4229         *argsout = NULL;
4230         return result;
4231       }
4232 
4233       old_index++;  // Next slot in the input list
4234 
4235       JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4236                                   "old %d new %d file %d\n",
4237                                   old_index,
4238                                   new_args_head->nOptions,
4239                                   file_slots));
4240     } else {
4241       // We only increment the index if the option preexisted.
4242       // The options file copying increments the index too
4243       new_option_p->optionString =
4244           os::strdup_check_oom(old_option_p->optionString, mtInternal);
4245 
4246       if (new_option_p->optionString == NULL) {
4247         jio_fprintf(defaultStream::error_stream(),
4248                     "Could not allocate command option string '%s'\n",
4249                     old_option_p->optionString);
4250 
4251         FreeVMOptions(&new_args_head, argsin);
4252         *argsout = NULL;
4253         os::free(buff);
4254         buff = NULL;
4255         os::free(options_file);
4256         options_file = NULL;
4257         return JNI_ENOMEM;
4258       }
4259 
4260       new_option_p->extraInfo = NULL;
4261 
4262       DumpOption(old_option_p, old_index, "old");
4263       DumpOption(new_option_p, new_args_head->nOptions, "new");
4264 
4265       DumpVMOption(new_args_head, new_args_head->nOptions, "new");
4266       DumpVMOption(argsin, old_index, "old");
4267       old_index++;  // Next slot in the input list
4268       new_args_head->nOptions++;  // Next slot in the new args list
4269      }
4270 
4271   }
4272 
4273   os::free(buff);
4274   buff = NULL;
4275   os::free(options_file);
4276   options_file = NULL;
4277 
4278   JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4279                               "trace final num ops %d\n",
4280                               new_args_head->nOptions));
4281 
4282   // We have a list of options that is ready to be returned to the caller.
4283   *argsout = new_args_head;
4284   DumpVMOptions(*argsout, "Postmerge");
4285   return JNI_OK;
4286 }
4287 
4288 // Parse entry point called from JNI_CreateJavaVM
4289 
4290 jint Arguments::parse(const struct JavaVMInitArgs *argsin) {
4291   const char* hotspotrc = ".hotspotrc";
4292   bool settings_file_specified = false;
4293   bool needs_hotspotrc_warning = false;
4294 
4295   // If flag "-XX:Flags=flags-file" is used it will be the
4296   // first option to be processed.
4297   const char* flags_file;
4298   int index;
4299   struct JavaVMInitArgs *args = NULL;
4300 
4301   jint result = Arguments::merge_JVM_options_file(argsin, &args);
4302   if (result != JNI_OK) {
4303     // A more specific error message has been printed to the error stream
4304     jio_fprintf(defaultStream::error_stream(),
4305                 "Options merge error, VM will exit\n");
4306     vm_exit(1);
4307   }
4308 
4309   if (args == NULL) {
4310     args = (JavaVMInitArgs *)argsin;
4311     JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4312                                 "no file options merged\n"));
4313   } else {
4314     JVM_ARGS_ETRACE(jio_fprintf(defaultStream::error_stream(),
4315                                 "file options merged\n"));
4316   }
4317 
4318   DumpVMOptions(args, "Final Command Line");
4319   const char* tail = NULL;
4320   for (index = 0; index < args->nOptions; index++) {
4321     const JavaVMOption *option = args->options + index;
4322     if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
4323       // -XX:VMOptionsFile= can only appear here if the option file
4324       // is empty or if there are no options to process, ignore it.
4325       continue;
4326     }
4327     if (ArgumentsExt::process_options(option)) {
4328       continue;
4329     }
4330     if (match_option(option, "-XX:Flags=", &tail)) {
4331       flags_file = tail;
4332       settings_file_specified = true;
4333       continue;
4334     }
4335     if (match_option(option, "-XX:+PrintVMOptions")) {
4336       PrintVMOptions = true;
4337       continue;
4338     }
4339     if (match_option(option, "-XX:-PrintVMOptions")) {
4340       PrintVMOptions = false;
4341       continue;
4342     }
4343     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
4344       IgnoreUnrecognizedVMOptions = true;
4345       continue;
4346     }
4347     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
4348       IgnoreUnrecognizedVMOptions = false;
4349       continue;
4350     }
4351     if (match_option(option, "-XX:+PrintFlagsInitial")) {
4352       CommandLineFlags::printFlags(tty, false);
4353       vm_exit(0);
4354     }
4355     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4356 #if INCLUDE_NMT
4357       // The launcher did not setup nmt environment variable properly.
4358       if (!MemTracker::check_launcher_nmt_support(tail)) {
4359         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4360       }
4361 
4362       // Verify if nmt option is valid.
4363       if (MemTracker::verify_nmt_option()) {
4364         // Late initialization, still in single-threaded mode.
4365         if (MemTracker::tracking_level() >= NMT_summary) {
4366           MemTracker::init();
4367         }
4368       } else {
4369         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4370       }
4371       continue;
4372 #else
4373       jio_fprintf(defaultStream::error_stream(),
4374         "Native Memory Tracking is not supported in this VM\n");
4375       return JNI_ERR;
4376 #endif
4377     }
4378 
4379 #ifndef PRODUCT
4380     if (match_option(option, "-XX:+PrintFlagsWithComments")) {
4381       CommandLineFlags::printFlags(tty, true);
4382       vm_exit(0);
4383     }
4384 #endif
4385   }
4386 
4387   if (IgnoreUnrecognizedVMOptions) {
4388     // uncast const to modify the flag args->ignoreUnrecognized
4389     *(jboolean*)(&args->ignoreUnrecognized) = true;
4390   }
4391 
4392   // Parse specified settings file
4393   if (settings_file_specified) {
4394     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4395       FreeVMOptions(&args, argsin);
4396       return JNI_EINVAL;
4397     }
4398   } else {
4399 #ifdef ASSERT
4400     // Parse default .hotspotrc settings file
4401     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4402       FreeVMOptions(&args, argsin);
4403       return JNI_EINVAL;
4404     }
4405 #else
4406     struct stat buf;
4407     if (os::stat(hotspotrc, &buf) == 0) {
4408       needs_hotspotrc_warning = true;
4409     }
4410 #endif
4411   }
4412 
4413   if (PrintVMOptions) {
4414     for (index = 0; index < args->nOptions; index++) {
4415       const JavaVMOption *option = args->options + index;
4416       if (match_option(option, "-XX:", &tail)) {
4417         logOption(tail);
4418       }
4419     }
4420   }
4421 
4422   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4423   result = parse_vm_init_args(args);
4424   if (result != JNI_OK) {
4425     FreeVMOptions(&args, argsin);
4426     return result;
4427   }
4428 
4429   FreeVMOptions(&args, argsin);
4430 
4431   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4432   SharedArchivePath = get_shared_archive_path();
4433   if (SharedArchivePath == NULL) {
4434     return JNI_ENOMEM;
4435   }
4436 
4437   // Set up VerifySharedSpaces
4438   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4439     VerifySharedSpaces = true;
4440   }
4441 
4442   // Delay warning until here so that we've had a chance to process
4443   // the -XX:-PrintWarnings flag
4444   if (needs_hotspotrc_warning) {
4445     warning("%s file is present but has been ignored.  "
4446             "Run with -XX:Flags=%s to load the file.",
4447             hotspotrc, hotspotrc);
4448   }
4449 
4450 #if defined(_ALLBSD_SOURCE) || defined(AIX)  // UseLargePages is not yet supported on BSD and AIX.
4451   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4452 #endif
4453 
4454   ArgumentsExt::report_unsupported_options();
4455 
4456 #ifndef PRODUCT
4457   if (TraceBytecodesAt != 0) {
4458     TraceBytecodes = true;
4459   }
4460   if (CountCompiledCalls) {
4461     if (UseCounterDecay) {
4462       warning("UseCounterDecay disabled because CountCalls is set");
4463       UseCounterDecay = false;
4464     }
4465   }
4466 #endif // PRODUCT
4467 
4468   if (ScavengeRootsInCode == 0) {
4469     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4470       warning("forcing ScavengeRootsInCode non-zero");
4471     }
4472     ScavengeRootsInCode = 1;
4473   }
4474 
4475   if (PrintGCDetails) {
4476     // Turn on -verbose:gc options as well
4477     PrintGC = true;
4478   }
4479 
4480   // Set object alignment values.
4481   set_object_alignment();
4482 
4483 #if !INCLUDE_ALL_GCS
4484   force_serial_gc();
4485 #endif // INCLUDE_ALL_GCS
4486 #if !INCLUDE_CDS
4487   if (DumpSharedSpaces || RequireSharedSpaces) {
4488     jio_fprintf(defaultStream::error_stream(),
4489       "Shared spaces are not supported in this VM\n");
4490     return JNI_ERR;
4491   }
4492   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4493     warning("Shared spaces are not supported in this VM");
4494     FLAG_SET_DEFAULT(UseSharedSpaces, false);
4495     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4496   }
4497   no_shared_spaces("CDS Disabled");
4498 #endif // INCLUDE_CDS
4499 
4500   return JNI_OK;
4501 }
4502 
4503 jint Arguments::apply_ergo() {
4504 
4505   // Set flags based on ergonomics.
4506   set_ergonomics_flags();
4507 
4508   set_shared_spaces_flags();
4509 
4510   // Check the GC selections again.
4511   if (!check_gc_consistency()) {
4512     return JNI_EINVAL;
4513   }
4514 
4515   if (TieredCompilation) {
4516     set_tiered_flags();
4517   } else {
4518     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4519     if (CompilationPolicyChoice >= 2) {
4520       vm_exit_during_initialization(
4521         "Incompatible compilation policy selected", NULL);
4522     }
4523     // Scale CompileThreshold
4524     // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4525     if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4526       FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4527     }
4528   }
4529 
4530 #ifdef COMPILER2
4531 #ifndef PRODUCT
4532   if (PrintIdealGraphLevel > 0) {
4533     FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4534   }
4535 #endif
4536 #endif
4537 
4538   // Set heap size based on available physical memory
4539   set_heap_size();
4540 
4541   ArgumentsExt::set_gc_specific_flags();
4542 
4543   // Initialize Metaspace flags and alignments
4544   Metaspace::ergo_initialize();
4545 
4546   // Set bytecode rewriting flags
4547   set_bytecode_flags();
4548 
4549   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4550   set_aggressive_opts_flags();
4551 
4552   // Turn off biased locking for locking debug mode flags,
4553   // which are subtly different from each other but neither works with
4554   // biased locking
4555   if (UseHeavyMonitors
4556 #ifdef COMPILER1
4557       || !UseFastLocking
4558 #endif // COMPILER1
4559     ) {
4560     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4561       // flag set to true on command line; warn the user that they
4562       // can't enable biased locking here
4563       warning("Biased Locking is not supported with locking debug flags"
4564               "; ignoring UseBiasedLocking flag." );
4565     }
4566     UseBiasedLocking = false;
4567   }
4568 
4569 #ifdef ZERO
4570   // Clear flags not supported on zero.
4571   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4572   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4573   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4574   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4575 #endif // CC_INTERP
4576 
4577 #ifdef COMPILER2
4578   if (!EliminateLocks) {
4579     EliminateNestedLocks = false;
4580   }
4581   if (!Inline) {
4582     IncrementalInline = false;
4583   }
4584 #ifndef PRODUCT
4585   if (!IncrementalInline) {
4586     AlwaysIncrementalInline = false;
4587   }
4588 #endif
4589   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4590     // nothing to use the profiling, turn if off
4591     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4592   }
4593 #endif
4594 
4595   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4596     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4597     DebugNonSafepoints = true;
4598   }
4599 
4600   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4601     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4602   }
4603 
4604 #ifndef PRODUCT
4605   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4606     if (use_vm_log()) {
4607       LogVMOutput = true;
4608     }
4609   }
4610 #endif // PRODUCT
4611 
4612   if (PrintCommandLineFlags) {
4613     CommandLineFlags::printSetFlags(tty);
4614   }
4615 
4616   // Apply CPU specific policy for the BiasedLocking
4617   if (UseBiasedLocking) {
4618     if (!VM_Version::use_biased_locking() &&
4619         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4620       UseBiasedLocking = false;
4621     }
4622   }
4623 #ifdef COMPILER2
4624   if (!UseBiasedLocking || EmitSync != 0) {
4625     UseOptoBiasInlining = false;
4626   }
4627 #endif
4628 
4629   return JNI_OK;
4630 }
4631 
4632 jint Arguments::adjust_after_os() {
4633   if (UseNUMA) {
4634     if (UseParallelGC || UseParallelOldGC) {
4635       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4636          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4637       }
4638     }
4639     // UseNUMAInterleaving is set to ON for all collectors and
4640     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4641     // such as the parallel collector for Linux and Solaris will
4642     // interleave old gen and survivor spaces on top of NUMA
4643     // allocation policy for the eden space.
4644     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4645     // all platforms and ParallelGC on Windows will interleave all
4646     // of the heap spaces across NUMA nodes.
4647     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4648       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4649     }
4650   }
4651   return JNI_OK;
4652 }
4653 
4654 int Arguments::PropertyList_count(SystemProperty* pl) {
4655   int count = 0;
4656   while(pl != NULL) {
4657     count++;
4658     pl = pl->next();
4659   }
4660   return count;
4661 }
4662 
4663 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4664   assert(key != NULL, "just checking");
4665   SystemProperty* prop;
4666   for (prop = pl; prop != NULL; prop = prop->next()) {
4667     if (strcmp(key, prop->key()) == 0) return prop->value();
4668   }
4669   return NULL;
4670 }
4671 
4672 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4673   int count = 0;
4674   const char* ret_val = NULL;
4675 
4676   while(pl != NULL) {
4677     if(count >= index) {
4678       ret_val = pl->key();
4679       break;
4680     }
4681     count++;
4682     pl = pl->next();
4683   }
4684 
4685   return ret_val;
4686 }
4687 
4688 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4689   int count = 0;
4690   char* ret_val = NULL;
4691 
4692   while(pl != NULL) {
4693     if(count >= index) {
4694       ret_val = pl->value();
4695       break;
4696     }
4697     count++;
4698     pl = pl->next();
4699   }
4700 
4701   return ret_val;
4702 }
4703 
4704 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4705   SystemProperty* p = *plist;
4706   if (p == NULL) {
4707     *plist = new_p;
4708   } else {
4709     while (p->next() != NULL) {
4710       p = p->next();
4711     }
4712     p->set_next(new_p);
4713   }
4714 }
4715 
4716 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4717   if (plist == NULL)
4718     return;
4719 
4720   SystemProperty* new_p = new SystemProperty(k, v, true);
4721   PropertyList_add(plist, new_p);
4722 }
4723 
4724 void Arguments::PropertyList_add(SystemProperty *element) {
4725   PropertyList_add(&_system_properties, element);
4726 }
4727 
4728 // This add maintains unique property key in the list.
4729 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4730   if (plist == NULL)
4731     return;
4732 
4733   // If property key exist then update with new value.
4734   SystemProperty* prop;
4735   for (prop = *plist; prop != NULL; prop = prop->next()) {
4736     if (strcmp(k, prop->key()) == 0) {
4737       if (append) {
4738         prop->append_value(v);
4739       } else {
4740         prop->set_value(v);
4741       }
4742       return;
4743     }
4744   }
4745 
4746   PropertyList_add(plist, k, v);
4747 }
4748 
4749 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4750 // Returns true if all of the source pointed by src has been copied over to
4751 // the destination buffer pointed by buf. Otherwise, returns false.
4752 // Notes:
4753 // 1. If the length (buflen) of the destination buffer excluding the
4754 // NULL terminator character is not long enough for holding the expanded
4755 // pid characters, it also returns false instead of returning the partially
4756 // expanded one.
4757 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4758 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4759                                 char* buf, size_t buflen) {
4760   const char* p = src;
4761   char* b = buf;
4762   const char* src_end = &src[srclen];
4763   char* buf_end = &buf[buflen - 1];
4764 
4765   while (p < src_end && b < buf_end) {
4766     if (*p == '%') {
4767       switch (*(++p)) {
4768       case '%':         // "%%" ==> "%"
4769         *b++ = *p++;
4770         break;
4771       case 'p':  {       //  "%p" ==> current process id
4772         // buf_end points to the character before the last character so
4773         // that we could write '\0' to the end of the buffer.
4774         size_t buf_sz = buf_end - b + 1;
4775         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4776 
4777         // if jio_snprintf fails or the buffer is not long enough to hold
4778         // the expanded pid, returns false.
4779         if (ret < 0 || ret >= (int)buf_sz) {
4780           return false;
4781         } else {
4782           b += ret;
4783           assert(*b == '\0', "fail in copy_expand_pid");
4784           if (p == src_end && b == buf_end + 1) {
4785             // reach the end of the buffer.
4786             return true;
4787           }
4788         }
4789         p++;
4790         break;
4791       }
4792       default :
4793         *b++ = '%';
4794       }
4795     } else {
4796       *b++ = *p++;
4797     }
4798   }
4799   *b = '\0';
4800   return (p == src_end); // return false if not all of the source was copied
4801 }