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