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