1 /*
   2  * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classLoader.hpp"
  27 #include "classfile/javaAssertions.hpp"
  28 #include "classfile/symbolTable.hpp"
  29 #include "compiler/compilerOracle.hpp"
  30 #include "memory/allocation.inline.hpp"
  31 #include "memory/cardTableRS.hpp"
  32 #include "memory/genCollectedHeap.hpp"
  33 #include "memory/referenceProcessor.hpp"
  34 #include "memory/universe.inline.hpp"
  35 #include "oops/oop.inline.hpp"
  36 #include "prims/jvmtiExport.hpp"
  37 #include "runtime/arguments.hpp"
  38 #include "runtime/arguments_ext.hpp"
  39 #include "runtime/globals_extension.hpp"
  40 #include "runtime/java.hpp"
  41 #include "services/management.hpp"
  42 #include "services/memTracker.hpp"
  43 #include "utilities/defaultStream.hpp"
  44 #include "utilities/macros.hpp"
  45 #include "utilities/stringUtils.hpp"
  46 #include "utilities/taskqueue.hpp"



  47 #ifdef TARGET_OS_FAMILY_linux
  48 # include "os_linux.inline.hpp"
  49 #endif
  50 #ifdef TARGET_OS_FAMILY_solaris
  51 # include "os_solaris.inline.hpp"
  52 #endif
  53 #ifdef TARGET_OS_FAMILY_windows
  54 # include "os_windows.inline.hpp"
  55 #endif
  56 #ifdef TARGET_OS_FAMILY_aix
  57 # include "os_aix.inline.hpp"
  58 #endif
  59 #ifdef TARGET_OS_FAMILY_bsd
  60 # include "os_bsd.inline.hpp"
  61 #endif
  62 #if INCLUDE_ALL_GCS
  63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
  64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  66 #endif // INCLUDE_ALL_GCS
  67 
  68 // Note: This is a special bug reporting site for the JVM
  69 #ifdef VENDOR_URL_VM_BUG
  70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
  71 #else
  72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
  73 #endif
  74 #define DEFAULT_JAVA_LAUNCHER  "generic"
  75 
  76 // Disable options not supported in this release, with a warning if they
  77 // were explicitly requested on the command-line
  78 #define UNSUPPORTED_OPTION(opt, description)                    \
  79 do {                                                            \
  80   if (opt) {                                                    \
  81     if (FLAG_IS_CMDLINE(opt)) {                                 \
  82       warning(description " is disabled in this release.");     \
  83     }                                                           \
  84     FLAG_SET_DEFAULT(opt, false);                               \
  85   }                                                             \
  86 } while(0)
  87 
  88 #define UNSUPPORTED_GC_OPTION(gc)                                     \
  89 do {                                                                  \
  90   if (gc) {                                                           \
  91     if (FLAG_IS_CMDLINE(gc)) {                                        \
  92       warning(#gc " is not supported in this VM.  Using Serial GC."); \
  93     }                                                                 \
  94     FLAG_SET_DEFAULT(gc, false);                                      \
  95   }                                                                   \
  96 } while(0)
  97 
  98 char**  Arguments::_jvm_flags_array             = NULL;
  99 int     Arguments::_num_jvm_flags               = 0;
 100 char**  Arguments::_jvm_args_array              = NULL;
 101 int     Arguments::_num_jvm_args                = 0;
 102 char*  Arguments::_java_command                 = NULL;
 103 SystemProperty* Arguments::_system_properties   = NULL;
 104 const char*  Arguments::_gc_log_filename        = NULL;
 105 bool   Arguments::_has_profile                  = false;
 106 size_t Arguments::_conservative_max_heap_alignment = 0;
 107 uintx  Arguments::_min_heap_size                = 0;
 108 uintx  Arguments::_min_heap_free_ratio          = 0;
 109 uintx  Arguments::_max_heap_free_ratio          = 0;
 110 Arguments::Mode Arguments::_mode                = _mixed;
 111 bool   Arguments::_java_compiler                = false;
 112 bool   Arguments::_xdebug_mode                  = false;
 113 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
 114 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
 115 int    Arguments::_sun_java_launcher_pid        = -1;
 116 bool   Arguments::_created_by_gamma_launcher    = false;
 117 
 118 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
 119 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
 120 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
 121 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
 122 bool   Arguments::_ClipInlining                 = ClipInlining;
 123 
 124 char*  Arguments::SharedArchivePath             = NULL;
 125 
 126 AgentLibraryList Arguments::_libraryList;
 127 AgentLibraryList Arguments::_agentList;
 128 
 129 abort_hook_t     Arguments::_abort_hook         = NULL;
 130 exit_hook_t      Arguments::_exit_hook          = NULL;
 131 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
 132 
 133 
 134 SystemProperty *Arguments::_java_ext_dirs = NULL;
 135 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
 136 SystemProperty *Arguments::_sun_boot_library_path = NULL;
 137 SystemProperty *Arguments::_java_library_path = NULL;
 138 SystemProperty *Arguments::_java_home = NULL;
 139 SystemProperty *Arguments::_java_class_path = NULL;
 140 SystemProperty *Arguments::_sun_boot_class_path = NULL;
 141 
 142 char* Arguments::_meta_index_path = NULL;
 143 char* Arguments::_meta_index_dir = NULL;
 144 
 145 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
 146 
 147 static bool match_option(const JavaVMOption *option, const char* name,
 148                          const char** tail) {
 149   int len = (int)strlen(name);
 150   if (strncmp(option->optionString, name, len) == 0) {
 151     *tail = option->optionString + len;
 152     return true;
 153   } else {
 154     return false;
 155   }
 156 }
 157 














 158 static void logOption(const char* opt) {
 159   if (PrintVMOptions) {
 160     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
 161   }
 162 }
 163 
 164 // Process java launcher properties.
 165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
 166   // See if sun.java.launcher or sun.java.launcher.pid is defined.
 167   // Must do this before setting up other system properties,
 168   // as some of them may depend on launcher type.
 169   for (int index = 0; index < args->nOptions; index++) {
 170     const JavaVMOption* option = args->options + index;
 171     const char* tail;
 172 
 173     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
 174       process_java_launcher_argument(tail, option->extraInfo);
 175       continue;
 176     }
 177     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
 178       _sun_java_launcher_pid = atoi(tail);
 179       continue;
 180     }
 181   }
 182 }
 183 
 184 // Initialize system properties key and value.
 185 void Arguments::init_system_properties() {
 186 
 187   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
 188                                                                  "Java Virtual Machine Specification",  false));
 189   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
 190   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
 191   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
 192 
 193   // following are JVMTI agent writeable properties.
 194   // Properties values are set to NULL and they are
 195   // os specific they are initialized in os::init_system_properties_values().
 196   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
 197   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
 198   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
 199   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
 200   _java_home =  new SystemProperty("java.home", NULL,  true);
 201   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
 202 
 203   _java_class_path = new SystemProperty("java.class.path", "",  true);
 204 
 205   // Add to System Property list.
 206   PropertyList_add(&_system_properties, _java_ext_dirs);
 207   PropertyList_add(&_system_properties, _java_endorsed_dirs);
 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   if (JDK_Version::is_gte_jdk17x_version()) {
 227     spec_vendor = "Oracle Corporation";
 228     spec_version = JDK_Version::current().major_version();
 229   }
 230   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
 231 
 232   PropertyList_add(&_system_properties,
 233       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
 234   PropertyList_add(&_system_properties,
 235       new SystemProperty("java.vm.specification.version", buffer, false));
 236   PropertyList_add(&_system_properties,
 237       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
 238 }
 239 
 240 /**
 241  * Provide a slightly more user-friendly way of eliminating -XX flags.
 242  * When a flag is eliminated, it can be added to this list in order to
 243  * continue accepting this flag on the command-line, while issuing a warning
 244  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
 245  * limit, we flatly refuse to admit the existence of the flag.  This allows
 246  * a flag to die correctly over JDK releases using HSX.
 247  */
 248 typedef struct {
 249   const char* name;
 250   JDK_Version obsoleted_in; // when the flag went away
 251   JDK_Version accept_until; // which version to start denying the existence
 252 } ObsoleteFlag;
 253 
 254 static ObsoleteFlag obsolete_jvm_flags[] = {
 255   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
 256   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
 257   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
 258   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
 259   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
 260   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
 261   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
 262   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 263   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 264   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
 265   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
 266   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
 267   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
 268   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
 269   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 270   { "DefaultInitialRAMFraction",
 271                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
 272   { "UseDepthFirstScavengeOrder",
 273                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
 274   { "HandlePromotionFailure",
 275                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 276   { "MaxLiveObjectEvacuationRatio",
 277                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
 278   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
 279   { "UseParallelOldGCCompacting",
 280                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 281   { "UseParallelDensePrefixUpdate",
 282                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 283   { "UseParallelOldGCDensePrefix",
 284                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
 285   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
 286   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
 287   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 288   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 289   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 290   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 291   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 292   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 293   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 294   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 295   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 296   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
 297   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
 298   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 299   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
 300   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
 301   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
 302   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
 303   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
 304   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
 305   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
 306   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
 307   { "CompilationRepeat",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
 308 #ifdef PRODUCT
 309   { "DesiredMethodLimit",
 310                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
 311 #endif // PRODUCT
 312   { NULL, JDK_Version(0), JDK_Version(0) }
 313 };
 314 
 315 // Returns true if the flag is obsolete and fits into the range specified
 316 // for being ignored.  In the case that the flag is ignored, the 'version'
 317 // value is filled in with the version number when the flag became
 318 // obsolete so that that value can be displayed to the user.
 319 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
 320   int i = 0;
 321   assert(version != NULL, "Must provide a version buffer");
 322   while (obsolete_jvm_flags[i].name != NULL) {
 323     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
 324     // <flag>=xxx form
 325     // [-|+]<flag> form
 326     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
 327         ((s[0] == '+' || s[0] == '-') &&
 328         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
 329       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
 330           *version = flag_status.obsoleted_in;
 331           return true;
 332       }
 333     }
 334     i++;
 335   }
 336   return false;
 337 }
 338 
 339 // Constructs the system class path (aka boot class path) from the following
 340 // components, in order:
 341 //
 342 //     prefix           // from -Xbootclasspath/p:...
 343 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
 344 //     base             // from os::get_system_properties() or -Xbootclasspath=
 345 //     suffix           // from -Xbootclasspath/a:...
 346 //
 347 // java.endorsed.dirs is a list of directories; any jar or zip files in the
 348 // directories are added to the sysclasspath just before the base.
 349 //
 350 // This could be AllStatic, but it isn't needed after argument processing is
 351 // complete.
 352 class SysClassPath: public StackObj {
 353 public:
 354   SysClassPath(const char* base);
 355   ~SysClassPath();
 356 
 357   inline void set_base(const char* base);
 358   inline void add_prefix(const char* prefix);
 359   inline void add_suffix_to_prefix(const char* suffix);
 360   inline void add_suffix(const char* suffix);
 361   inline void reset_path(const char* base);
 362 
 363   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
 364   // property.  Must be called after all command-line arguments have been
 365   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
 366   // combined_path().
 367   void expand_endorsed();
 368 
 369   inline const char* get_base()     const { return _items[_scp_base]; }
 370   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
 371   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
 372   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
 373 
 374   // Combine all the components into a single c-heap-allocated string; caller
 375   // must free the string if/when no longer needed.
 376   char* combined_path();
 377 
 378 private:
 379   // Utility routines.
 380   static char* add_to_path(const char* path, const char* str, bool prepend);
 381   static char* add_jars_to_path(char* path, const char* directory);
 382 
 383   inline void reset_item_at(int index);
 384 
 385   // Array indices for the items that make up the sysclasspath.  All except the
 386   // base are allocated in the C heap and freed by this class.
 387   enum {
 388     _scp_prefix,        // from -Xbootclasspath/p:...
 389     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
 390     _scp_base,          // the default sysclasspath
 391     _scp_suffix,        // from -Xbootclasspath/a:...
 392     _scp_nitems         // the number of items, must be last.
 393   };
 394 
 395   const char* _items[_scp_nitems];
 396   DEBUG_ONLY(bool _expansion_done;)
 397 };
 398 
 399 SysClassPath::SysClassPath(const char* base) {
 400   memset(_items, 0, sizeof(_items));
 401   _items[_scp_base] = base;
 402   DEBUG_ONLY(_expansion_done = false;)
 403 }
 404 
 405 SysClassPath::~SysClassPath() {
 406   // Free everything except the base.
 407   for (int i = 0; i < _scp_nitems; ++i) {
 408     if (i != _scp_base) reset_item_at(i);
 409   }
 410   DEBUG_ONLY(_expansion_done = false;)
 411 }
 412 
 413 inline void SysClassPath::set_base(const char* base) {
 414   _items[_scp_base] = base;
 415 }
 416 
 417 inline void SysClassPath::add_prefix(const char* prefix) {
 418   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
 419 }
 420 
 421 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
 422   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
 423 }
 424 
 425 inline void SysClassPath::add_suffix(const char* suffix) {
 426   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
 427 }
 428 
 429 inline void SysClassPath::reset_item_at(int index) {
 430   assert(index < _scp_nitems && index != _scp_base, "just checking");
 431   if (_items[index] != NULL) {
 432     FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
 433     _items[index] = NULL;
 434   }
 435 }
 436 
 437 inline void SysClassPath::reset_path(const char* base) {
 438   // Clear the prefix and suffix.
 439   reset_item_at(_scp_prefix);
 440   reset_item_at(_scp_suffix);
 441   set_base(base);
 442 }
 443 
 444 //------------------------------------------------------------------------------
 445 
 446 void SysClassPath::expand_endorsed() {
 447   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
 448 
 449   const char* path = Arguments::get_property("java.endorsed.dirs");
 450   if (path == NULL) {
 451     path = Arguments::get_endorsed_dir();
 452     assert(path != NULL, "no default for java.endorsed.dirs");
 453   }
 454 
 455   char* expanded_path = NULL;
 456   const char separator = *os::path_separator();
 457   const char* const end = path + strlen(path);
 458   while (path < end) {
 459     const char* tmp_end = strchr(path, separator);
 460     if (tmp_end == NULL) {
 461       expanded_path = add_jars_to_path(expanded_path, path);
 462       path = end;
 463     } else {
 464       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
 465       memcpy(dirpath, path, tmp_end - path);
 466       dirpath[tmp_end - path] = '\0';
 467       expanded_path = add_jars_to_path(expanded_path, dirpath);
 468       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
 469       path = tmp_end + 1;
 470     }
 471   }
 472   _items[_scp_endorsed] = expanded_path;
 473   DEBUG_ONLY(_expansion_done = true;)
 474 }
 475 
 476 // Combine the bootclasspath elements, some of which may be null, into a single
 477 // c-heap-allocated string.
 478 char* SysClassPath::combined_path() {
 479   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
 480   assert(_expansion_done, "must call expand_endorsed() first.");
 481 
 482   size_t lengths[_scp_nitems];
 483   size_t total_len = 0;
 484 
 485   const char separator = *os::path_separator();
 486 
 487   // Get the lengths.
 488   int i;
 489   for (i = 0; i < _scp_nitems; ++i) {
 490     if (_items[i] != NULL) {
 491       lengths[i] = strlen(_items[i]);
 492       // Include space for the separator char (or a NULL for the last item).
 493       total_len += lengths[i] + 1;
 494     }
 495   }
 496   assert(total_len > 0, "empty sysclasspath not allowed");
 497 
 498   // Copy the _items to a single string.
 499   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
 500   char* cp_tmp = cp;
 501   for (i = 0; i < _scp_nitems; ++i) {
 502     if (_items[i] != NULL) {
 503       memcpy(cp_tmp, _items[i], lengths[i]);
 504       cp_tmp += lengths[i];
 505       *cp_tmp++ = separator;
 506     }
 507   }
 508   *--cp_tmp = '\0';     // Replace the extra separator.
 509   return cp;
 510 }
 511 
 512 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 513 char*
 514 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
 515   char *cp;
 516 
 517   assert(str != NULL, "just checking");
 518   if (path == NULL) {
 519     size_t len = strlen(str) + 1;
 520     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 521     memcpy(cp, str, len);                       // copy the trailing null
 522   } else {
 523     const char separator = *os::path_separator();
 524     size_t old_len = strlen(path);
 525     size_t str_len = strlen(str);
 526     size_t len = old_len + str_len + 2;
 527 
 528     if (prepend) {
 529       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
 530       char* cp_tmp = cp;
 531       memcpy(cp_tmp, str, str_len);
 532       cp_tmp += str_len;
 533       *cp_tmp = separator;
 534       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
 535       FREE_C_HEAP_ARRAY(char, path, mtInternal);
 536     } else {
 537       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
 538       char* cp_tmp = cp + old_len;
 539       *cp_tmp = separator;
 540       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
 541     }
 542   }
 543   return cp;
 544 }
 545 
 546 // Scan the directory and append any jar or zip files found to path.
 547 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
 548 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
 549   DIR* dir = os::opendir(directory);
 550   if (dir == NULL) return path;
 551 
 552   char dir_sep[2] = { '\0', '\0' };
 553   size_t directory_len = strlen(directory);
 554   const char fileSep = *os::file_separator();
 555   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
 556 
 557   /* Scan the directory for jars/zips, appending them to path. */
 558   struct dirent *entry;
 559   while ((entry = os::readdir(dir)) != NULL) {
 560     const char* name = entry->d_name;
 561     const char* ext = name + strlen(name) - 4;
 562     bool isJarOrZip = ext > name &&
 563       (os::file_name_strcmp(ext, ".jar") == 0 ||
 564        os::file_name_strcmp(ext, ".zip") == 0);
 565     if (isJarOrZip) {
 566       size_t length = directory_len + 2 + strlen(name);
 567       char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
 568       jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
 569       path = add_to_path(path, jarpath, false);
 570       FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
 571     }
 572   }
 573   os::closedir(dir);
 574   return path;
 575 }
 576 
 577 // Parses a memory size specification string.
 578 static bool atomull(const char *s, julong* result) {
 579   julong n = 0;
 580   int args_read = sscanf(s, JULONG_FORMAT, &n);
 581   if (args_read != 1) {
 582     return false;
 583   }
 584   while (*s != '\0' && isdigit(*s)) {
 585     s++;
 586   }
 587   // 4705540: illegal if more characters are found after the first non-digit
 588   if (strlen(s) > 1) {
 589     return false;
 590   }
 591   switch (*s) {
 592     case 'T': case 't':
 593       *result = n * G * K;
 594       // Check for overflow.
 595       if (*result/((julong)G * K) != n) return false;
 596       return true;
 597     case 'G': case 'g':
 598       *result = n * G;
 599       if (*result/G != n) return false;
 600       return true;
 601     case 'M': case 'm':
 602       *result = n * M;
 603       if (*result/M != n) return false;
 604       return true;
 605     case 'K': case 'k':
 606       *result = n * K;
 607       if (*result/K != n) return false;
 608       return true;
 609     case '\0':
 610       *result = n;
 611       return true;
 612     default:
 613       return false;
 614   }
 615 }
 616 
 617 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
 618   if (size < min_size) return arg_too_small;
 619   // Check that size will fit in a size_t (only relevant on 32-bit)
 620   if (size > max_uintx) return arg_too_big;
 621   return arg_in_range;
 622 }
 623 
 624 // Describe an argument out of range error
 625 void Arguments::describe_range_error(ArgsRange errcode) {
 626   switch(errcode) {
 627   case arg_too_big:
 628     jio_fprintf(defaultStream::error_stream(),
 629                 "The specified size exceeds the maximum "
 630                 "representable size.\n");
 631     break;
 632   case arg_too_small:
 633   case arg_unreadable:
 634   case arg_in_range:
 635     // do nothing for now
 636     break;
 637   default:
 638     ShouldNotReachHere();
 639   }
 640 }
 641 
 642 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
 643   return CommandLineFlags::boolAtPut(name, &value, origin);
 644 }
 645 
 646 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
 647   double v;
 648   if (sscanf(value, "%lf", &v) != 1) {
 649     return false;
 650   }
 651 
 652   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
 653     return true;
 654   }
 655   return false;
 656 }
 657 
 658 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
 659   julong v;
 660   intx intx_v;
 661   bool is_neg = false;
 662   // Check the sign first since atomull() parses only unsigned values.
 663   if (*value == '-') {
 664     if (!CommandLineFlags::intxAt(name, &intx_v)) {
 665       return false;
 666     }
 667     value++;
 668     is_neg = true;
 669   }
 670   if (!atomull(value, &v)) {
 671     return false;
 672   }
 673   intx_v = (intx) v;
 674   if (is_neg) {
 675     intx_v = -intx_v;
 676   }
 677   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
 678     return true;
 679   }
 680   uintx uintx_v = (uintx) v;
 681   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
 682     return true;
 683   }
 684   uint64_t uint64_t_v = (uint64_t) v;
 685   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
 686     return true;
 687   }
 688   return false;
 689 }
 690 
 691 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
 692   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
 693   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
 694   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 695   return true;
 696 }
 697 
 698 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
 699   const char* old_value = "";
 700   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
 701   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
 702   size_t new_len = strlen(new_value);
 703   const char* value;
 704   char* free_this_too = NULL;
 705   if (old_len == 0) {
 706     value = new_value;
 707   } else if (new_len == 0) {
 708     value = old_value;
 709   } else {
 710     size_t length = old_len + 1 + new_len + 1;
 711     char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
 712     // each new setting adds another LINE to the switch:
 713     jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
 714     value = buf;
 715     free_this_too = buf;
 716   }
 717   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
 718   // CommandLineFlags always returns a pointer that needs freeing.
 719   FREE_C_HEAP_ARRAY(char, value, mtInternal);
 720   if (free_this_too != NULL) {
 721     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
 722     FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
 723   }
 724   return true;
 725 }
 726 
 727 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
 728 
 729   // range of acceptable characters spelled out for portability reasons
 730 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
 731 #define BUFLEN 255
 732   char name[BUFLEN+1];
 733   char dummy;
 734 
 735   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 736     return set_bool_flag(name, false, origin);
 737   }
 738   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
 739     return set_bool_flag(name, true, origin);
 740   }
 741 
 742   char punct;
 743   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
 744     const char* value = strchr(arg, '=') + 1;
 745     Flag* flag = Flag::find_flag(name, strlen(name));
 746     if (flag != NULL && flag->is_ccstr()) {
 747       if (flag->ccstr_accumulates()) {
 748         return append_to_string_flag(name, value, origin);
 749       } else {
 750         if (value[0] == '\0') {
 751           value = NULL;
 752         }
 753         return set_string_flag(name, value, origin);
 754       }
 755     }
 756   }
 757 
 758   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
 759     const char* value = strchr(arg, '=') + 1;
 760     // -XX:Foo:=xxx will reset the string flag to the given value.
 761     if (value[0] == '\0') {
 762       value = NULL;
 763     }
 764     return set_string_flag(name, value, origin);
 765   }
 766 
 767 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
 768 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
 769 #define        NUMBER_RANGE    "[0123456789]"
 770   char value[BUFLEN + 1];
 771   char value2[BUFLEN + 1];
 772   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
 773     // Looks like a floating-point number -- try again with more lenient format string
 774     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
 775       return set_fp_numeric_flag(name, value, origin);
 776     }
 777   }
 778 
 779 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
 780   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
 781     return set_numeric_flag(name, value, origin);
 782   }
 783 
 784   return false;
 785 }
 786 
 787 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
 788   assert(bldarray != NULL, "illegal argument");
 789 
 790   if (arg == NULL) {
 791     return;
 792   }
 793 
 794   int new_count = *count + 1;
 795 
 796   // expand the array and add arg to the last element
 797   if (*bldarray == NULL) {
 798     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
 799   } else {
 800     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
 801   }
 802   (*bldarray)[*count] = strdup(arg);
 803   *count = new_count;
 804 }
 805 
 806 void Arguments::build_jvm_args(const char* arg) {
 807   add_string(&_jvm_args_array, &_num_jvm_args, arg);
 808 }
 809 
 810 void Arguments::build_jvm_flags(const char* arg) {
 811   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
 812 }
 813 
 814 // utility function to return a string that concatenates all
 815 // strings in a given char** array
 816 const char* Arguments::build_resource_string(char** args, int count) {
 817   if (args == NULL || count == 0) {
 818     return NULL;
 819   }
 820   size_t length = 0;
 821   for (int i = 0; i < count; i++) {
 822     length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
 823   }
 824   char* s = NEW_RESOURCE_ARRAY(char, length);
 825   char* dst = s;
 826   for (int j = 0; j < count; j++) {
 827     size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
 828     jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
 829     dst += offset;
 830     length -= offset;
 831   }
 832   return (const char*) s;
 833 }
 834 
 835 void Arguments::print_on(outputStream* st) {
 836   st->print_cr("VM Arguments:");
 837   if (num_jvm_flags() > 0) {
 838     st->print("jvm_flags: "); print_jvm_flags_on(st);
 839   }
 840   if (num_jvm_args() > 0) {
 841     st->print("jvm_args: "); print_jvm_args_on(st);
 842   }
 843   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
 844   if (_java_class_path != NULL) {
 845     char* path = _java_class_path->value();
 846     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
 847   }
 848   st->print_cr("Launcher Type: %s", _sun_java_launcher);
 849 }
 850 
 851 void Arguments::print_jvm_flags_on(outputStream* st) {
 852   if (_num_jvm_flags > 0) {
 853     for (int i=0; i < _num_jvm_flags; i++) {
 854       st->print("%s ", _jvm_flags_array[i]);
 855     }
 856     st->cr();
 857   }
 858 }
 859 
 860 void Arguments::print_jvm_args_on(outputStream* st) {
 861   if (_num_jvm_args > 0) {
 862     for (int i=0; i < _num_jvm_args; i++) {
 863       st->print("%s ", _jvm_args_array[i]);
 864     }
 865     st->cr();
 866   }
 867 }
 868 
 869 bool Arguments::process_argument(const char* arg,
 870     jboolean ignore_unrecognized, Flag::Flags origin) {
 871 
 872   JDK_Version since = JDK_Version();
 873 
 874   if (parse_argument(arg, origin) || ignore_unrecognized) {
 875     return true;
 876   }
 877 
 878   bool has_plus_minus = (*arg == '+' || *arg == '-');
 879   const char* const argname = has_plus_minus ? arg + 1 : arg;
 880   if (is_newly_obsolete(arg, &since)) {
 881     char version[256];
 882     since.to_string(version, sizeof(version));
 883     warning("ignoring option %s; support was removed in %s", argname, version);
 884     return true;
 885   }
 886 
 887   // For locked flags, report a custom error message if available.
 888   // Otherwise, report the standard unrecognized VM option.
 889 
 890   size_t arg_len;
 891   const char* equal_sign = strchr(argname, '=');
 892   if (equal_sign == NULL) {
 893     arg_len = strlen(argname);
 894   } else {
 895     arg_len = equal_sign - argname;
 896   }
 897 
 898   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
 899   if (found_flag != NULL) {
 900     char locked_message_buf[BUFLEN];
 901     found_flag->get_locked_message(locked_message_buf, BUFLEN);
 902     if (strlen(locked_message_buf) == 0) {
 903       if (found_flag->is_bool() && !has_plus_minus) {
 904         jio_fprintf(defaultStream::error_stream(),
 905           "Missing +/- setting for VM option '%s'\n", argname);
 906       } else if (!found_flag->is_bool() && has_plus_minus) {
 907         jio_fprintf(defaultStream::error_stream(),
 908           "Unexpected +/- setting in VM option '%s'\n", argname);
 909       } else {
 910         jio_fprintf(defaultStream::error_stream(),
 911           "Improperly specified VM option '%s'\n", argname);
 912       }
 913     } else {
 914       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
 915     }
 916   } else {
 917     jio_fprintf(defaultStream::error_stream(),
 918                 "Unrecognized VM option '%s'\n", argname);
 919     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
 920     if (fuzzy_matched != NULL) {
 921       jio_fprintf(defaultStream::error_stream(),
 922                   "Did you mean '%s%s%s'?\n",
 923                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
 924                   fuzzy_matched->_name,
 925                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
 926     }
 927   }
 928 
 929   // allow for commandline "commenting out" options like -XX:#+Verbose
 930   return arg[0] == '#';
 931 }
 932 
 933 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
 934   FILE* stream = fopen(file_name, "rb");
 935   if (stream == NULL) {
 936     if (should_exist) {
 937       jio_fprintf(defaultStream::error_stream(),
 938                   "Could not open settings file %s\n", file_name);
 939       return false;
 940     } else {
 941       return true;
 942     }
 943   }
 944 
 945   char token[1024];
 946   int  pos = 0;
 947 
 948   bool in_white_space = true;
 949   bool in_comment     = false;
 950   bool in_quote       = false;
 951   char quote_c        = 0;
 952   bool result         = true;
 953 
 954   int c = getc(stream);
 955   while(c != EOF && pos < (int)(sizeof(token)-1)) {
 956     if (in_white_space) {
 957       if (in_comment) {
 958         if (c == '\n') in_comment = false;
 959       } else {
 960         if (c == '#') in_comment = true;
 961         else if (!isspace(c)) {
 962           in_white_space = false;
 963           token[pos++] = c;
 964         }
 965       }
 966     } else {
 967       if (c == '\n' || (!in_quote && isspace(c))) {
 968         // token ends at newline, or at unquoted whitespace
 969         // this allows a way to include spaces in string-valued options
 970         token[pos] = '\0';
 971         logOption(token);
 972         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 973         build_jvm_flags(token);
 974         pos = 0;
 975         in_white_space = true;
 976         in_quote = false;
 977       } else if (!in_quote && (c == '\'' || c == '"')) {
 978         in_quote = true;
 979         quote_c = c;
 980       } else if (in_quote && (c == quote_c)) {
 981         in_quote = false;
 982       } else {
 983         token[pos++] = c;
 984       }
 985     }
 986     c = getc(stream);
 987   }
 988   if (pos > 0) {
 989     token[pos] = '\0';
 990     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
 991     build_jvm_flags(token);
 992   }
 993   fclose(stream);
 994   return result;
 995 }
 996 
 997 //=============================================================================================================
 998 // Parsing of properties (-D)
 999 
1000 const char* Arguments::get_property(const char* key) {
1001   return PropertyList_get_value(system_properties(), key);
1002 }
1003 
1004 bool Arguments::add_property(const char* prop) {
1005   const char* eq = strchr(prop, '=');
1006   char* key;
1007   // ns must be static--its address may be stored in a SystemProperty object.
1008   const static char ns[1] = {0};
1009   char* value = (char *)ns;
1010 
1011   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1012   key = AllocateHeap(key_len + 1, mtInternal);
1013   strncpy(key, prop, key_len);
1014   key[key_len] = '\0';
1015 
1016   if (eq != NULL) {
1017     size_t value_len = strlen(prop) - key_len - 1;
1018     value = AllocateHeap(value_len + 1, mtInternal);
1019     strncpy(value, &prop[key_len + 1], value_len + 1);
1020   }
1021 
1022   if (strcmp(key, "java.compiler") == 0) {
1023     process_java_compiler_argument(value);
1024     FreeHeap(key);
1025     if (eq != NULL) {
1026       FreeHeap(value);
1027     }
1028     return true;
1029   } else if (strcmp(key, "sun.java.command") == 0) {
1030     _java_command = value;
1031 
1032     // Record value in Arguments, but let it get passed to Java.
1033   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1034     // launcher.pid property is private and is processed
1035     // in process_sun_java_launcher_properties();
1036     // the sun.java.launcher property is passed on to the java application
1037     FreeHeap(key);
1038     if (eq != NULL) {
1039       FreeHeap(value);
1040     }
1041     return true;
1042   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1043     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1044     // its value without going through the property list or making a Java call.
1045     _java_vendor_url_bug = value;
1046   } else if (strcmp(key, "sun.boot.library.path") == 0) {
1047     PropertyList_unique_add(&_system_properties, key, value, true);
1048     return true;
1049   }
1050   // Create new property and add at the end of the list
1051   PropertyList_unique_add(&_system_properties, key, value);
1052   return true;
1053 }
1054 
1055 //===========================================================================================================
1056 // Setting int/mixed/comp mode flags
1057 
1058 void Arguments::set_mode_flags(Mode mode) {
1059   // Set up default values for all flags.
1060   // If you add a flag to any of the branches below,
1061   // add a default value for it here.
1062   set_java_compiler(false);
1063   _mode                      = mode;
1064 
1065   // Ensure Agent_OnLoad has the correct initial values.
1066   // This may not be the final mode; mode may change later in onload phase.
1067   PropertyList_unique_add(&_system_properties, "java.vm.info",
1068                           (char*)VM_Version::vm_info_string(), false);
1069 
1070   UseInterpreter             = true;
1071   UseCompiler                = true;
1072   UseLoopCounter             = true;
1073 
1074 #ifndef ZERO
1075   // Turn these off for mixed and comp.  Leave them on for Zero.
1076   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1077     UseFastAccessorMethods = (mode == _int);
1078   }
1079   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1080     UseFastEmptyMethods = (mode == _int);
1081   }
1082 #endif
1083 
1084   // Default values may be platform/compiler dependent -
1085   // use the saved values
1086   ClipInlining               = Arguments::_ClipInlining;
1087   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
1088   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
1089   BackgroundCompilation      = Arguments::_BackgroundCompilation;
1090 
1091   // Change from defaults based on mode
1092   switch (mode) {
1093   default:
1094     ShouldNotReachHere();
1095     break;
1096   case _int:
1097     UseCompiler              = false;
1098     UseLoopCounter           = false;
1099     AlwaysCompileLoopMethods = false;
1100     UseOnStackReplacement    = false;
1101     break;
1102   case _mixed:
1103     // same as default
1104     break;
1105   case _comp:
1106     UseInterpreter           = false;
1107     BackgroundCompilation    = false;
1108     ClipInlining             = false;
1109     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1110     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1111     // compile a level 4 (C2) and then continue executing it.
1112     if (TieredCompilation) {
1113       Tier3InvokeNotifyFreqLog = 0;
1114       Tier4InvocationThreshold = 0;
1115     }
1116     break;
1117   }
1118 }
1119 
1120 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1121 // Conflict: required to use shared spaces (-Xshare:on), but
1122 // incompatible command line options were chosen.
1123 
1124 static void no_shared_spaces(const char* message) {
1125   if (RequireSharedSpaces) {
1126     jio_fprintf(defaultStream::error_stream(),
1127       "Class data sharing is inconsistent with other specified options.\n");
1128     vm_exit_during_initialization("Unable to use shared archive.", message);
1129   } else {
1130     FLAG_SET_DEFAULT(UseSharedSpaces, false);
1131   }
1132 }
1133 #endif
1134 
1135 void Arguments::set_tiered_flags() {
1136   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1137   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1138     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1139   }
1140   if (CompilationPolicyChoice < 2) {
1141     vm_exit_during_initialization(
1142       "Incompatible compilation policy selected", NULL);
1143   }
1144   // Increase the code cache size - tiered compiles a lot more.
1145   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1146     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1147   }
1148   if (!UseInterpreter) { // -Xcomp
1149     Tier3InvokeNotifyFreqLog = 0;
1150     Tier4InvocationThreshold = 0;
1151   }
1152 }
1153 
1154 /**
1155  * Returns the minimum number of compiler threads needed to run the JVM. The following
1156  * configurations are possible.
1157  *
1158  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1159  *    compiler threads is 0.
1160  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1161  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1162  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1163  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1164  *    C1 can be used, so the minimum number of compiler threads is 1.
1165  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1166  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1167  *    the minimum number of compiler threads is 2.
1168  */
1169 int Arguments::get_min_number_of_compiler_threads() {
1170 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1171   return 0;   // case 1
1172 #else
1173   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1174     return 1; // case 2 or case 3
1175   }
1176   return 2;   // case 4 (tiered)
1177 #endif
1178 }
1179 
1180 #if INCLUDE_ALL_GCS
1181 static void disable_adaptive_size_policy(const char* collector_name) {
1182   if (UseAdaptiveSizePolicy) {
1183     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1184       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1185               collector_name);
1186     }
1187     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1188   }
1189 }
1190 
1191 void Arguments::set_parnew_gc_flags() {
1192   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1193          "control point invariant");
1194   assert(UseParNewGC, "Error");
1195 
1196   // Turn off AdaptiveSizePolicy for parnew until it is complete.
1197   disable_adaptive_size_policy("UseParNewGC");
1198 
1199   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1200     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1201     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1202   } else if (ParallelGCThreads == 0) {
1203     jio_fprintf(defaultStream::error_stream(),
1204         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1205     vm_exit(1);
1206   }
1207 
1208   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1209   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1210   // we set them to 1024 and 1024.
1211   // See CR 6362902.
1212   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1213     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1214   }
1215   if (FLAG_IS_DEFAULT(OldPLABSize)) {
1216     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1217   }
1218 
1219   // AlwaysTenure flag should make ParNew promote all at first collection.
1220   // See CR 6362902.
1221   if (AlwaysTenure) {
1222     FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1223   }
1224   // When using compressed oops, we use local overflow stacks,
1225   // rather than using a global overflow list chained through
1226   // the klass word of the object's pre-image.
1227   if (UseCompressedOops && !ParGCUseLocalOverflow) {
1228     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1229       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1230     }
1231     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1232   }
1233   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1234 }
1235 
1236 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1237 // sparc/solaris for certain applications, but would gain from
1238 // further optimization and tuning efforts, and would almost
1239 // certainly gain from analysis of platform and environment.
1240 void Arguments::set_cms_and_parnew_gc_flags() {
1241   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1242   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1243 
1244   // If we are using CMS, we prefer to UseParNewGC,
1245   // unless explicitly forbidden.
1246   if (FLAG_IS_DEFAULT(UseParNewGC)) {
1247     FLAG_SET_ERGO(bool, UseParNewGC, true);
1248   }
1249 
1250   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1251   disable_adaptive_size_policy("UseConcMarkSweepGC");
1252 
1253   // In either case, adjust ParallelGCThreads and/or UseParNewGC
1254   // as needed.
1255   if (UseParNewGC) {
1256     set_parnew_gc_flags();
1257   }
1258 
1259   size_t max_heap = align_size_down(MaxHeapSize,
1260                                     CardTableRS::ct_max_alignment_constraint());
1261 
1262   // Now make adjustments for CMS
1263   intx   tenuring_default = (intx)6;
1264   size_t young_gen_per_worker = CMSYoungGenPerWorker;
1265 
1266   // Preferred young gen size for "short" pauses:
1267   // upper bound depends on # of threads and NewRatio.
1268   const uintx parallel_gc_threads =
1269     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1270   const size_t preferred_max_new_size_unaligned =
1271     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1272   size_t preferred_max_new_size =
1273     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1274 
1275   // Unless explicitly requested otherwise, size young gen
1276   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1277 
1278   // If either MaxNewSize or NewRatio is set on the command line,
1279   // assume the user is trying to set the size of the young gen.
1280   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1281 
1282     // Set MaxNewSize to our calculated preferred_max_new_size unless
1283     // NewSize was set on the command line and it is larger than
1284     // preferred_max_new_size.
1285     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
1286       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1287     } else {
1288       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1289     }
1290     if (PrintGCDetails && Verbose) {
1291       // Too early to use gclog_or_tty
1292       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1293     }
1294 
1295     // Code along this path potentially sets NewSize and OldSize
1296     if (PrintGCDetails && Verbose) {
1297       // Too early to use gclog_or_tty
1298       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1299            " initial_heap_size:  " SIZE_FORMAT
1300            " max_heap: " SIZE_FORMAT,
1301            min_heap_size(), InitialHeapSize, max_heap);
1302     }
1303     size_t min_new = preferred_max_new_size;
1304     if (FLAG_IS_CMDLINE(NewSize)) {
1305       min_new = NewSize;
1306     }
1307     if (max_heap > min_new && min_heap_size() > min_new) {
1308       // Unless explicitly requested otherwise, make young gen
1309       // at least min_new, and at most preferred_max_new_size.
1310       if (FLAG_IS_DEFAULT(NewSize)) {
1311         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1312         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1313         if (PrintGCDetails && Verbose) {
1314           // Too early to use gclog_or_tty
1315           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1316         }
1317       }
1318       // Unless explicitly requested otherwise, size old gen
1319       // so it's NewRatio x of NewSize.
1320       if (FLAG_IS_DEFAULT(OldSize)) {
1321         if (max_heap > NewSize) {
1322           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1323           if (PrintGCDetails && Verbose) {
1324             // Too early to use gclog_or_tty
1325             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1326           }
1327         }
1328       }
1329     }
1330   }
1331   // Unless explicitly requested otherwise, definitely
1332   // promote all objects surviving "tenuring_default" scavenges.
1333   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1334       FLAG_IS_DEFAULT(SurvivorRatio)) {
1335     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1336   }
1337   // If we decided above (or user explicitly requested)
1338   // `promote all' (via MaxTenuringThreshold := 0),
1339   // prefer minuscule survivor spaces so as not to waste
1340   // space for (non-existent) survivors
1341   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1342     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1343   }
1344   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1345   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1346   // This is done in order to make ParNew+CMS configuration to work
1347   // with YoungPLABSize and OldPLABSize options.
1348   // See CR 6362902.
1349   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1350     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1351       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1352       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
1353       // the value (either from the command line or ergonomics) of
1354       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
1355       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1356     } else {
1357       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1358       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1359       // we'll let it to take precedence.
1360       jio_fprintf(defaultStream::error_stream(),
1361                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1362                   " options are specified for the CMS collector."
1363                   " CMSParPromoteBlocksToClaim will take precedence.\n");
1364     }
1365   }
1366   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1367     // OldPLAB sizing manually turned off: Use a larger default setting,
1368     // unless it was manually specified. This is because a too-low value
1369     // will slow down scavenges.
1370     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1371       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1372     }
1373   }
1374   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1375   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1376   // If either of the static initialization defaults have changed, note this
1377   // modification.
1378   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1379     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1380   }
1381 
1382   if (PrintGCDetails && Verbose) {
1383     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1384       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1385     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1386   }
1387 }
1388 #endif // INCLUDE_ALL_GCS
1389 
1390 void set_object_alignment() {
1391   // Object alignment.
1392   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1393   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
1394   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1395   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
1396   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1397   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1398 
1399   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
1400   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
1401 
1402   // Oop encoding heap max
1403   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1404 
1405 #if INCLUDE_ALL_GCS
1406   // Set CMS global values
1407   CompactibleFreeListSpace::set_cms_values();
1408 #endif // INCLUDE_ALL_GCS
1409 }
1410 
1411 bool verify_object_alignment() {
1412   // Object alignment.
1413   if (!is_power_of_2(ObjectAlignmentInBytes)) {
1414     jio_fprintf(defaultStream::error_stream(),
1415                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1416                 (int)ObjectAlignmentInBytes);
1417     return false;
1418   }
1419   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1420     jio_fprintf(defaultStream::error_stream(),
1421                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1422                 (int)ObjectAlignmentInBytes, BytesPerLong);
1423     return false;
1424   }
1425   // It does not make sense to have big object alignment
1426   // since a space lost due to alignment will be greater
1427   // then a saved space from compressed oops.
1428   if ((int)ObjectAlignmentInBytes > 256) {
1429     jio_fprintf(defaultStream::error_stream(),
1430                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1431                 (int)ObjectAlignmentInBytes);
1432     return false;
1433   }
1434   // In case page size is very small.
1435   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1436     jio_fprintf(defaultStream::error_stream(),
1437                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1438                 (int)ObjectAlignmentInBytes, os::vm_page_size());
1439     return false;
1440   }
1441   if(SurvivorAlignmentInBytes == 0) {
1442     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1443   } else {
1444     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1445       jio_fprintf(defaultStream::error_stream(),
1446             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1447             (int)SurvivorAlignmentInBytes);
1448       return false;
1449     }
1450     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1451       jio_fprintf(defaultStream::error_stream(),
1452           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1453           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1454       return false;
1455     }
1456   }
1457   return true;
1458 }
1459 
1460 size_t Arguments::max_heap_for_compressed_oops() {
1461   // Avoid sign flip.
1462   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1463   // We need to fit both the NULL page and the heap into the memory budget, while
1464   // keeping alignment constraints of the heap. To guarantee the latter, as the
1465   // NULL page is located before the heap, we pad the NULL page to the conservative
1466   // maximum alignment that the GC may ever impose upon the heap.
1467   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1468                                                         _conservative_max_heap_alignment);
1469 
1470   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1471   NOT_LP64(ShouldNotReachHere(); return 0);
1472 }
1473 
1474 bool Arguments::should_auto_select_low_pause_collector() {
1475   if (UseAutoGCSelectPolicy &&
1476       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1477       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1478     if (PrintGCDetails) {
1479       // Cannot use gclog_or_tty yet.
1480       tty->print_cr("Automatic selection of the low pause collector"
1481        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1482     }
1483     return true;
1484   }
1485   return false;
1486 }
1487 
1488 void Arguments::set_use_compressed_oops() {
1489 #ifndef ZERO
1490 #ifdef _LP64
1491   // MaxHeapSize is not set up properly at this point, but
1492   // the only value that can override MaxHeapSize if we are
1493   // to use UseCompressedOops is InitialHeapSize.
1494   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1495 
1496   if (max_heap_size <= max_heap_for_compressed_oops()) {
1497 #if !defined(COMPILER1) || defined(TIERED)
1498     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1499       FLAG_SET_ERGO(bool, UseCompressedOops, true);
1500     }
1501 #endif
1502 #ifdef _WIN64
1503     if (UseLargePages && UseCompressedOops) {
1504       // Cannot allocate guard pages for implicit checks in indexed addressing
1505       // mode, when large pages are specified on windows.
1506       // This flag could be switched ON if narrow oop base address is set to 0,
1507       // see code in Universe::initialize_heap().
1508       Universe::set_narrow_oop_use_implicit_null_checks(false);
1509     }
1510 #endif //  _WIN64
1511   } else {
1512     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1513       warning("Max heap size too large for Compressed Oops");
1514       FLAG_SET_DEFAULT(UseCompressedOops, false);
1515       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1516     }
1517   }
1518 #endif // _LP64
1519 #endif // ZERO
1520 }
1521 
1522 
1523 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1524 // set_use_compressed_oops().
1525 void Arguments::set_use_compressed_klass_ptrs() {
1526 #ifndef ZERO
1527 #ifdef _LP64
1528   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1529   if (!UseCompressedOops) {
1530     if (UseCompressedClassPointers) {
1531       warning("UseCompressedClassPointers requires UseCompressedOops");
1532     }
1533     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1534   } else {
1535     // Turn on UseCompressedClassPointers too
1536     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1537       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1538     }
1539     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1540     if (UseCompressedClassPointers) {
1541       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1542         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1543         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1544       }
1545     }
1546   }
1547 #endif // _LP64
1548 #endif // !ZERO
1549 }
1550 
1551 void Arguments::set_conservative_max_heap_alignment() {
1552   // The conservative maximum required alignment for the heap is the maximum of
1553   // the alignments imposed by several sources: any requirements from the heap
1554   // itself, the collector policy and the maximum page size we may run the VM
1555   // with.
1556   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1557 #if INCLUDE_ALL_GCS
1558   if (UseParallelGC) {
1559     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1560   } else if (UseG1GC) {
1561     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1562   }
1563 #endif // INCLUDE_ALL_GCS
1564   _conservative_max_heap_alignment = MAX4(heap_alignment,
1565                                           (size_t)os::vm_allocation_granularity(),
1566                                           os::max_page_size(),
1567                                           CollectorPolicy::compute_heap_alignment());
1568 }
1569 
1570 void Arguments::select_gc_ergonomically() {
1571   if (os::is_server_class_machine()) {
1572     if (should_auto_select_low_pause_collector()) {
1573       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1574     } else {
1575       FLAG_SET_ERGO(bool, UseParallelGC, true);
1576     }
1577   }
1578 }
1579 
1580 void Arguments::select_gc() {
1581   if (!gc_selected()) {
1582     select_gc_ergonomically();
1583   }
1584 }
1585 
1586 void Arguments::set_ergonomics_flags() {
1587   select_gc();
1588 
1589 #ifdef COMPILER2
1590   // Shared spaces work fine with other GCs but causes bytecode rewriting
1591   // to be disabled, which hurts interpreter performance and decreases
1592   // server performance.  When -server is specified, keep the default off
1593   // unless it is asked for.  Future work: either add bytecode rewriting
1594   // at link time, or rewrite bytecodes in non-shared methods.
1595   if (!DumpSharedSpaces && !RequireSharedSpaces &&
1596       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1597     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1598   }
1599 #endif
1600 
1601   set_conservative_max_heap_alignment();
1602 
1603 #ifndef ZERO
1604 #ifdef _LP64
1605   set_use_compressed_oops();
1606 
1607   // set_use_compressed_klass_ptrs() must be called after calling
1608   // set_use_compressed_oops().
1609   set_use_compressed_klass_ptrs();
1610 
1611   // Also checks that certain machines are slower with compressed oops
1612   // in vm_version initialization code.
1613 #endif // _LP64
1614 #endif // !ZERO
1615 }
1616 
1617 void Arguments::set_parallel_gc_flags() {
1618   assert(UseParallelGC || UseParallelOldGC, "Error");
1619   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1620   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1621     FLAG_SET_DEFAULT(UseParallelOldGC, true);
1622   }
1623   FLAG_SET_DEFAULT(UseParallelGC, true);
1624 
1625   // If no heap maximum was requested explicitly, use some reasonable fraction
1626   // of the physical memory, up to a maximum of 1GB.
1627   FLAG_SET_DEFAULT(ParallelGCThreads,
1628                    Abstract_VM_Version::parallel_worker_threads());
1629   if (ParallelGCThreads == 0) {
1630     jio_fprintf(defaultStream::error_stream(),
1631         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1632     vm_exit(1);
1633   }
1634 
1635   if (UseAdaptiveSizePolicy) {
1636     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1637     // unless the user actually sets these flags.
1638     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1639       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1640       _min_heap_free_ratio = MinHeapFreeRatio;
1641     }
1642     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1643       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1644       _max_heap_free_ratio = MaxHeapFreeRatio;
1645     }
1646   }
1647 
1648   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1649   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1650   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
1651   // See CR 6362902 for details.
1652   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1653     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1654        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1655     }
1656     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1657       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1658     }
1659   }
1660 
1661   if (UseParallelOldGC) {
1662     // Par compact uses lower default values since they are treated as
1663     // minimums.  These are different defaults because of the different
1664     // interpretation and are not ergonomically set.
1665     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1666       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1667     }
1668   }
1669 }
1670 
1671 void Arguments::set_g1_gc_flags() {
1672   assert(UseG1GC, "Error");
1673 #ifdef COMPILER1
1674   FastTLABRefill = false;
1675 #endif
1676   FLAG_SET_DEFAULT(ParallelGCThreads,
1677                      Abstract_VM_Version::parallel_worker_threads());
1678   if (ParallelGCThreads == 0) {
1679     vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1680     }
1681 
1682 #if INCLUDE_ALL_GCS
1683   if (G1ConcRefinementThreads == 0) {
1684     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1685   }
1686 #endif
1687 
1688   // MarkStackSize will be set (if it hasn't been set by the user)
1689   // when concurrent marking is initialized.
1690   // Its value will be based upon the number of parallel marking threads.
1691   // But we do set the maximum mark stack size here.
1692   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1693     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1694   }
1695 
1696   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1697     // In G1, we want the default GC overhead goal to be higher than
1698     // say in PS. So we set it here to 10%. Otherwise the heap might
1699     // be expanded more aggressively than we would like it to. In
1700     // fact, even 10% seems to not be high enough in some cases
1701     // (especially small GC stress tests that the main thing they do
1702     // is allocation). We might consider increase it further.
1703     FLAG_SET_DEFAULT(GCTimeRatio, 9);
1704   }
1705 
1706   if (PrintGCDetails && Verbose) {
1707     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
1708       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1709     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1710   }
1711 }
1712 
1713 #if !INCLUDE_ALL_GCS
1714 #ifdef ASSERT
1715 static bool verify_serial_gc_flags() {
1716   return (UseSerialGC &&
1717         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1718           UseParallelGC || UseParallelOldGC));
1719 }
1720 #endif // ASSERT
1721 #endif // INCLUDE_ALL_GCS
1722 
1723 void Arguments::set_gc_specific_flags() {
1724 #if INCLUDE_ALL_GCS
1725   // Set per-collector flags
1726   if (UseParallelGC || UseParallelOldGC) {
1727     set_parallel_gc_flags();
1728   } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1729     set_cms_and_parnew_gc_flags();
1730   } else if (UseParNewGC) {  // Skipped if CMS is set above
1731     set_parnew_gc_flags();
1732   } else if (UseG1GC) {
1733     set_g1_gc_flags();
1734   }
1735   check_deprecated_gcs();
1736   check_deprecated_gc_flags();
1737   if (AssumeMP && !UseSerialGC) {
1738     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1739       warning("If the number of processors is expected to increase from one, then"
1740               " you should configure the number of parallel GC threads appropriately"
1741               " using -XX:ParallelGCThreads=N");
1742     }
1743   }
1744   if (MinHeapFreeRatio == 100) {
1745     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1746     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1747   }
1748 
1749   // If class unloading is disabled, also disable concurrent class unloading.
1750   if (!ClassUnloading) {
1751     FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1752     FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1753     FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1754   }
1755 #else // INCLUDE_ALL_GCS
1756   assert(verify_serial_gc_flags(), "SerialGC unset");
1757 #endif // INCLUDE_ALL_GCS
1758 }
1759 
1760 julong Arguments::limit_by_allocatable_memory(julong limit) {
1761   julong max_allocatable;
1762   julong result = limit;
1763   if (os::has_allocatable_memory_limit(&max_allocatable)) {
1764     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1765   }
1766   return result;
1767 }
1768 
1769 void Arguments::set_heap_size() {
1770   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1771     // Deprecated flag
1772     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1773   }
1774 
1775   julong phys_mem =
1776     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1777                             : (julong)MaxRAM;
1778 
1779   // Experimental support for CGroup memory limits
1780   if (UseCGroupMemoryLimitForHeap) {
1781     // This is a rough indicator that a CGroup limit may be in force
1782     // for this process
1783     const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1784     FILE *fp = fopen(lim_file, "r");
1785     if (fp != NULL) {
1786       julong cgroup_max = 0;
1787       int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1788       if (ret == 1 && cgroup_max > 0) {
1789         // If unlimited, cgroup_max will be a very large, but unspecified
1790         // value, so use initial phys_mem as a limit
1791         if (PrintGCDetails && Verbose) {
1792           // Cannot use gclog_or_tty yet.
1793           tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1794                         JULONG_FORMAT "MB) and initial phys_mem ("
1795                         JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1796         }
1797         phys_mem = MIN2(cgroup_max, phys_mem);
1798       } else {
1799         warning("Unable to read/parse cgroup memory limit from %s: %s",
1800                 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1801       }
1802       fclose(fp);
1803     } else {
1804       warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1805     }
1806   }
1807 
1808   // Convert Fraction to Precentage values
1809   if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1810       !FLAG_IS_DEFAULT(MaxRAMFraction))
1811     MaxRAMPercentage = 100.0 / MaxRAMFraction;
1812 
1813    if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1814        !FLAG_IS_DEFAULT(MinRAMFraction))
1815      MinRAMPercentage = 100.0 / MinRAMFraction;
1816 
1817    if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1818        !FLAG_IS_DEFAULT(InitialRAMFraction))
1819      InitialRAMPercentage = 100.0 / InitialRAMFraction;
1820 
1821   // If the maximum heap size has not been set with -Xmx,
1822   // then set it as fraction of the size of physical memory,
1823   // respecting the maximum and minimum sizes of the heap.
1824   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1825     julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1826     const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1827     if (reasonable_min < MaxHeapSize) {
1828       // Small physical memory, so use a minimum fraction of it for the heap
1829       reasonable_max = reasonable_min;
1830     } else {
1831       // Not-small physical memory, so require a heap at least
1832       // as large as MaxHeapSize
1833       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1834     }
1835 
1836     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1837       // Limit the heap size to ErgoHeapSizeLimit
1838       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1839     }
1840     if (UseCompressedOops) {
1841       // Limit the heap size to the maximum possible when using compressed oops
1842       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1843       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1844         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1845         // but it should be not less than default MaxHeapSize.
1846         max_coop_heap -= HeapBaseMinAddress;
1847       }
1848       reasonable_max = MIN2(reasonable_max, max_coop_heap);
1849     }
1850     reasonable_max = limit_by_allocatable_memory(reasonable_max);
1851 
1852     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1853       // An initial heap size was specified on the command line,
1854       // so be sure that the maximum size is consistent.  Done
1855       // after call to limit_by_allocatable_memory because that
1856       // method might reduce the allocation size.
1857       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1858     }
1859 
1860     if (PrintGCDetails && Verbose) {
1861       // Cannot use gclog_or_tty yet.
1862       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1863     }
1864     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1865   }
1866 
1867   // If the minimum or initial heap_size have not been set or requested to be set
1868   // ergonomically, set them accordingly.
1869   if (InitialHeapSize == 0 || min_heap_size() == 0) {
1870     julong reasonable_minimum = (julong)(OldSize + NewSize);
1871 
1872     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1873 
1874     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1875 
1876     if (InitialHeapSize == 0) {
1877       julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1878 
1879       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1880       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1881 
1882       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1883 
1884       if (PrintGCDetails && Verbose) {
1885         // Cannot use gclog_or_tty yet.
1886         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1887       }
1888       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1889     }
1890     // If the minimum heap size has not been set (via -Xms),
1891     // synchronize with InitialHeapSize to avoid errors with the default value.
1892     if (min_heap_size() == 0) {
1893       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1894       if (PrintGCDetails && Verbose) {
1895         // Cannot use gclog_or_tty yet.
1896         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
1897       }
1898     }
1899   }
1900 }
1901 
1902 // This option inspects the machine and attempts to set various
1903 // parameters to be optimal for long-running, memory allocation
1904 // intensive jobs.  It is intended for machines with large
1905 // amounts of cpu and memory.
1906 jint Arguments::set_aggressive_heap_flags() {
1907   // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1908   // VM, but we may not be able to represent the total physical memory
1909   // available (like having 8gb of memory on a box but using a 32bit VM).
1910   // Thus, we need to make sure we're using a julong for intermediate
1911   // calculations.
1912   julong initHeapSize;
1913   julong total_memory = os::physical_memory();
1914 
1915   if (total_memory < (julong) 256 * M) {
1916     jio_fprintf(defaultStream::error_stream(),
1917             "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1918     vm_exit(1);
1919   }
1920 
1921   // The heap size is half of available memory, or (at most)
1922   // all of possible memory less 160mb (leaving room for the OS
1923   // when using ISM).  This is the maximum; because adaptive sizing
1924   // is turned on below, the actual space used may be smaller.
1925 
1926   initHeapSize = MIN2(total_memory / (julong) 2,
1927                       total_memory - (julong) 160 * M);
1928 
1929   initHeapSize = limit_by_allocatable_memory(initHeapSize);
1930 
1931   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1932     FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
1933     FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
1934     // Currently the minimum size and the initial heap sizes are the same.
1935     set_min_heap_size(initHeapSize);
1936   }
1937   if (FLAG_IS_DEFAULT(NewSize)) {
1938     // Make the young generation 3/8ths of the total heap.
1939     FLAG_SET_CMDLINE(uintx, NewSize,
1940             ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
1941     FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
1942   }
1943 
1944 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
1945   FLAG_SET_DEFAULT(UseLargePages, true);
1946 #endif
1947 
1948   // Increase some data structure sizes for efficiency
1949   FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
1950   FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
1951   FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
1952 
1953   // See the OldPLABSize comment below, but replace 'after promotion'
1954   // with 'after copying'.  YoungPLABSize is the size of the survivor
1955   // space per-gc-thread buffers.  The default is 4kw.
1956   FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K);     // Note: this is in words
1957 
1958   // OldPLABSize is the size of the buffers in the old gen that
1959   // UseParallelGC uses to promote live data that doesn't fit in the
1960   // survivor spaces.  At any given time, there's one for each gc thread.
1961   // The default size is 1kw. These buffers are rarely used, since the
1962   // survivor spaces are usually big enough.  For specjbb, however, there
1963   // are occasions when there's lots of live data in the young gen
1964   // and we end up promoting some of it.  We don't have a definite
1965   // explanation for why bumping OldPLABSize helps, but the theory
1966   // is that a bigger PLAB results in retaining something like the
1967   // original allocation order after promotion, which improves mutator
1968   // locality.  A minor effect may be that larger PLABs reduce the
1969   // number of PLAB allocation events during gc.  The value of 8kw
1970   // was arrived at by experimenting with specjbb.
1971   FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K);      // Note: this is in words
1972 
1973   // Enable parallel GC and adaptive generation sizing
1974   FLAG_SET_CMDLINE(bool, UseParallelGC, true);
1975 
1976   // Encourage steady state memory management
1977   FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
1978 
1979   // This appears to improve mutator locality
1980   FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1981 
1982   // Get around early Solaris scheduling bug
1983   // (affinity vs other jobs on system)
1984   // but disallow DR and offlining (5008695).
1985   FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
1986 
1987   return JNI_OK;
1988 }
1989 
1990 // This must be called after ergonomics because we want bytecode rewriting
1991 // if the server compiler is used, or if UseSharedSpaces is disabled.
1992 void Arguments::set_bytecode_flags() {
1993   // Better not attempt to store into a read-only space.
1994   if (UseSharedSpaces) {
1995     FLAG_SET_DEFAULT(RewriteBytecodes, false);
1996     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1997   }
1998 
1999   if (!RewriteBytecodes) {
2000     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2001   }
2002 }
2003 
2004 // Aggressive optimization flags  -XX:+AggressiveOpts
2005 void Arguments::set_aggressive_opts_flags() {
2006 #ifdef COMPILER2
2007   if (AggressiveUnboxing) {
2008     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2009       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2010     } else if (!EliminateAutoBox) {
2011       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2012       AggressiveUnboxing = false;
2013     }
2014     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2015       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2016     } else if (!DoEscapeAnalysis) {
2017       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2018       AggressiveUnboxing = false;
2019     }
2020   }
2021   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2022     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2023       FLAG_SET_DEFAULT(EliminateAutoBox, true);
2024     }
2025     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2026       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2027     }
2028 
2029     // Feed the cache size setting into the JDK
2030     char buffer[1024];
2031     jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2032     add_property(buffer);
2033   }
2034   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2035     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2036   }
2037 #endif
2038 
2039   if (AggressiveOpts) {
2040 // Sample flag setting code
2041 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2042 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
2043 //    }
2044   }
2045 }
2046 
2047 //===========================================================================================================
2048 // Parsing of java.compiler property
2049 
2050 void Arguments::process_java_compiler_argument(char* arg) {
2051   // For backwards compatibility, Djava.compiler=NONE or ""
2052   // causes us to switch to -Xint mode UNLESS -Xdebug
2053   // is also specified.
2054   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2055     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
2056   }
2057 }
2058 
2059 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2060   _sun_java_launcher = strdup(launcher);
2061   if (strcmp("gamma", _sun_java_launcher) == 0) {
2062     _created_by_gamma_launcher = true;
2063   }
2064 }
2065 
2066 bool Arguments::created_by_java_launcher() {
2067   assert(_sun_java_launcher != NULL, "property must have value");
2068   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2069 }
2070 
2071 bool Arguments::created_by_gamma_launcher() {
2072   return _created_by_gamma_launcher;
2073 }
2074 
2075 //===========================================================================================================
2076 // Parsing of main arguments
2077 
2078 bool Arguments::verify_interval(uintx val, uintx min,
2079                                 uintx max, const char* name) {
2080   // Returns true iff value is in the inclusive interval [min..max]
2081   // false, otherwise.
2082   if (val >= min && val <= max) {
2083     return true;
2084   }
2085   jio_fprintf(defaultStream::error_stream(),
2086               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2087               " and " UINTX_FORMAT "\n",
2088               name, val, min, max);
2089   return false;
2090 }
2091 
2092 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2093   // Returns true if given value is at least specified min threshold
2094   // false, otherwise.
2095   if (val >= min ) {
2096       return true;
2097   }
2098   jio_fprintf(defaultStream::error_stream(),
2099               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2100               name, val, min);
2101   return false;
2102 }
2103 
2104 bool Arguments::verify_percentage(uintx value, const char* name) {
2105   if (is_percentage(value)) {
2106     return true;
2107   }
2108   jio_fprintf(defaultStream::error_stream(),
2109               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2110               name, value);
2111   return false;
2112 }
2113 
2114 // check if do gclog rotation
2115 // +UseGCLogFileRotation is a must,
2116 // no gc log rotation when log file not supplied or
2117 // NumberOfGCLogFiles is 0
2118 void check_gclog_consistency() {
2119   if (UseGCLogFileRotation) {
2120     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2121       jio_fprintf(defaultStream::output_stream(),
2122                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2123                   "where num_of_file > 0\n"
2124                   "GC log rotation is turned off\n");
2125       UseGCLogFileRotation = false;
2126     }
2127   }
2128 
2129   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2130     FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2131     jio_fprintf(defaultStream::output_stream(),
2132                 "GCLogFileSize changed to minimum 8K\n");
2133   }
2134 }
2135 
2136 // This function is called for -Xloggc:<filename>, it can be used
2137 // to check if a given file name(or string) conforms to the following
2138 // specification:
2139 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2140 // %p and %t only allowed once. We only limit usage of filename not path
2141 bool is_filename_valid(const char *file_name) {
2142   const char* p = file_name;
2143   char file_sep = os::file_separator()[0];
2144   const char* cp;
2145   // skip prefix path
2146   for (cp = file_name; *cp != '\0'; cp++) {
2147     if (*cp == '/' || *cp == file_sep) {
2148       p = cp + 1;
2149     }
2150   }
2151 
2152   int count_p = 0;
2153   int count_t = 0;
2154   while (*p != '\0') {
2155     if ((*p >= '0' && *p <= '9') ||
2156         (*p >= 'A' && *p <= 'Z') ||
2157         (*p >= 'a' && *p <= 'z') ||
2158          *p == '-'               ||
2159          *p == '_'               ||
2160          *p == '.') {
2161        p++;
2162        continue;
2163     }
2164     if (*p == '%') {
2165       if(*(p + 1) == 'p') {
2166         p += 2;
2167         count_p ++;
2168         continue;
2169       }
2170       if (*(p + 1) == 't') {
2171         p += 2;
2172         count_t ++;
2173         continue;
2174       }
2175     }
2176     return false;
2177   }
2178   return count_p < 2 && count_t < 2;
2179 }
2180 
2181 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2182   if (!is_percentage(min_heap_free_ratio)) {
2183     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2184     return false;
2185   }
2186   if (min_heap_free_ratio > MaxHeapFreeRatio) {
2187     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2188                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2189                   MaxHeapFreeRatio);
2190     return false;
2191   }
2192   // This does not set the flag itself, but stores the value in a safe place for later usage.
2193   _min_heap_free_ratio = min_heap_free_ratio;
2194   return true;
2195 }
2196 
2197 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2198   if (!is_percentage(max_heap_free_ratio)) {
2199     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2200     return false;
2201   }
2202   if (max_heap_free_ratio < MinHeapFreeRatio) {
2203     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2204                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2205                   MinHeapFreeRatio);
2206     return false;
2207   }
2208   // This does not set the flag itself, but stores the value in a safe place for later usage.
2209   _max_heap_free_ratio = max_heap_free_ratio;
2210   return true;
2211 }
2212 
2213 // Check consistency of GC selection
2214 bool Arguments::check_gc_consistency() {
2215   check_gclog_consistency();
2216   bool status = true;
2217   // Ensure that the user has not selected conflicting sets
2218   // of collectors. [Note: this check is merely a user convenience;
2219   // collectors over-ride each other so that only a non-conflicting
2220   // set is selected; however what the user gets is not what they
2221   // may have expected from the combination they asked for. It's
2222   // better to reduce user confusion by not allowing them to
2223   // select conflicting combinations.
2224   uint i = 0;
2225   if (UseSerialGC)                       i++;
2226   if (UseConcMarkSweepGC || UseParNewGC) i++;
2227   if (UseParallelGC || UseParallelOldGC) i++;
2228   if (UseG1GC)                           i++;
2229   if (i > 1) {
2230     jio_fprintf(defaultStream::error_stream(),
2231                 "Conflicting collector combinations in option list; "
2232                 "please refer to the release notes for the combinations "
2233                 "allowed\n");
2234     status = false;
2235   }
2236   return status;
2237 }
2238 
2239 void Arguments::check_deprecated_gcs() {
2240   if (UseConcMarkSweepGC && !UseParNewGC) {
2241     warning("Using the DefNew young collector with the CMS collector is deprecated "
2242         "and will likely be removed in a future release");
2243   }
2244 
2245   if (UseParNewGC && !UseConcMarkSweepGC) {
2246     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2247     // set up UseSerialGC properly, so that can't be used in the check here.
2248     warning("Using the ParNew young collector with the Serial old collector is deprecated "
2249         "and will likely be removed in a future release");
2250   }
2251 
2252   if (CMSIncrementalMode) {
2253     warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2254   }
2255 }
2256 
2257 void Arguments::check_deprecated_gc_flags() {
2258   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2259     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2260             "and will likely be removed in future release");
2261   }
2262   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2263     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2264         "Use MaxRAMFraction instead.");
2265   }
2266   if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2267     warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2268   }
2269   if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2270     warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2271   }
2272   if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2273     warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2274   }
2275 }
2276 
2277 // Check stack pages settings
2278 bool Arguments::check_stack_pages()
2279 {
2280   bool status = true;
2281   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2282   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2283   // greater stack shadow pages can't generate instruction to bang stack
2284   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2285   return status;
2286 }
2287 
2288 // Check the consistency of vm_init_args
2289 bool Arguments::check_vm_args_consistency() {
2290   // Method for adding checks for flag consistency.
2291   // The intent is to warn the user of all possible conflicts,
2292   // before returning an error.
2293   // Note: Needs platform-dependent factoring.
2294   bool status = true;
2295 
2296   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2297   // builds so the cost of stack banging can be measured.
2298 #if (defined(PRODUCT) && defined(SOLARIS))
2299   if (!UseBoundThreads && !UseStackBanging) {
2300     jio_fprintf(defaultStream::error_stream(),
2301                 "-UseStackBanging conflicts with -UseBoundThreads\n");
2302 
2303      status = false;
2304   }
2305 #endif
2306 
2307   if (TLABRefillWasteFraction == 0) {
2308     jio_fprintf(defaultStream::error_stream(),
2309                 "TLABRefillWasteFraction should be a denominator, "
2310                 "not " SIZE_FORMAT "\n",
2311                 TLABRefillWasteFraction);
2312     status = false;
2313   }
2314 
2315   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2316                               "AdaptiveSizePolicyWeight");
2317   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2318 
2319   // Divide by bucket size to prevent a large size from causing rollover when
2320   // calculating amount of memory needed to be allocated for the String table.
2321   status = status && verify_interval(StringTableSize, minimumStringTableSize,
2322     (max_uintx / StringTable::bucket_size()), "StringTable size");
2323 
2324   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2325     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2326 
2327   {
2328     // Using "else if" below to avoid printing two error messages if min > max.
2329     // This will also prevent us from reporting both min>100 and max>100 at the
2330     // same time, but that is less annoying than printing two identical errors IMHO.
2331     FormatBuffer<80> err_msg("%s","");
2332     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2333       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2334       status = false;
2335     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2336       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2337       status = false;
2338     }
2339   }
2340 
2341   // Min/MaxMetaspaceFreeRatio
2342   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2343   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2344 
2345   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2346     jio_fprintf(defaultStream::error_stream(),
2347                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2348                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2349                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2350                 MinMetaspaceFreeRatio,
2351                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2352                 MaxMetaspaceFreeRatio);
2353     status = false;
2354   }
2355 
2356   // Trying to keep 100% free is not practical
2357   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2358 
2359   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2360     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
2361   }
2362 
2363   if (UseParallelOldGC && ParallelOldGCSplitALot) {
2364     // Settings to encourage splitting.
2365     if (!FLAG_IS_CMDLINE(NewRatio)) {
2366       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2367     }
2368     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2369       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2370     }
2371   }
2372 
2373   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2374   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2375   if (GCTimeLimit == 100) {
2376     // Turn off gc-overhead-limit-exceeded checks
2377     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2378   }
2379 
2380   status = status && check_gc_consistency();
2381   status = status && check_stack_pages();
2382 
2383   if (CMSIncrementalMode) {
2384     if (!UseConcMarkSweepGC) {
2385       jio_fprintf(defaultStream::error_stream(),
2386                   "error:  invalid argument combination.\n"
2387                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2388                   "selected in order\nto use CMSIncrementalMode.\n");
2389       status = false;
2390     } else {
2391       status = status && verify_percentage(CMSIncrementalDutyCycle,
2392                                   "CMSIncrementalDutyCycle");
2393       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2394                                   "CMSIncrementalDutyCycleMin");
2395       status = status && verify_percentage(CMSIncrementalSafetyFactor,
2396                                   "CMSIncrementalSafetyFactor");
2397       status = status && verify_percentage(CMSIncrementalOffset,
2398                                   "CMSIncrementalOffset");
2399       status = status && verify_percentage(CMSExpAvgFactor,
2400                                   "CMSExpAvgFactor");
2401       // If it was not set on the command line, set
2402       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2403       if (CMSInitiatingOccupancyFraction < 0) {
2404         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2405       }
2406     }
2407   }
2408 
2409   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2410   // insists that we hold the requisite locks so that the iteration is
2411   // MT-safe. For the verification at start-up and shut-down, we don't
2412   // yet have a good way of acquiring and releasing these locks,
2413   // which are not visible at the CollectedHeap level. We want to
2414   // be able to acquire these locks and then do the iteration rather
2415   // than just disable the lock verification. This will be fixed under
2416   // bug 4788986.
2417   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2418     if (VerifyDuringStartup) {
2419       warning("Heap verification at start-up disabled "
2420               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2421       VerifyDuringStartup = false; // Disable verification at start-up
2422     }
2423 
2424     if (VerifyBeforeExit) {
2425       warning("Heap verification at shutdown disabled "
2426               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2427       VerifyBeforeExit = false; // Disable verification at shutdown
2428     }
2429   }
2430 
2431   // Note: only executed in non-PRODUCT mode
2432   if (!UseAsyncConcMarkSweepGC &&
2433       (ExplicitGCInvokesConcurrent ||
2434        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2435     jio_fprintf(defaultStream::error_stream(),
2436                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2437                 " with -UseAsyncConcMarkSweepGC");
2438     status = false;
2439   }
2440 
2441   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2442 
2443 #if INCLUDE_ALL_GCS
2444   if (UseG1GC) {
2445     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2446     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2447     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2448 
2449     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2450                                          "InitiatingHeapOccupancyPercent");
2451     status = status && verify_min_value(G1RefProcDrainInterval, 1,
2452                                         "G1RefProcDrainInterval");
2453     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2454                                         "G1ConcMarkStepDurationMillis");
2455     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2456                                        "G1ConcRSHotCardLimit");
2457     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2458                                        "G1ConcRSLogCacheSize");
2459     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2460                                        "StringDeduplicationAgeThreshold");
2461   }
2462   if (UseConcMarkSweepGC) {
2463     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2464     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2465     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2466     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2467 
2468     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2469 
2470     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2471     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2472     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2473 
2474     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2475 
2476     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2477     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2478 
2479     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2480     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2481     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2482 
2483     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2484 
2485     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2486 
2487     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2488     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2489     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2490     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2491     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2492   }
2493 
2494   if (UseParallelGC || UseParallelOldGC) {
2495     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2496     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2497 
2498     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2499     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2500 
2501     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2502     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2503 
2504     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2505 
2506     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2507   }
2508 #endif // INCLUDE_ALL_GCS
2509 
2510   status = status && verify_interval(RefDiscoveryPolicy,
2511                                      ReferenceProcessor::DiscoveryPolicyMin,
2512                                      ReferenceProcessor::DiscoveryPolicyMax,
2513                                      "RefDiscoveryPolicy");
2514 
2515   // Limit the lower bound of this flag to 1 as it is used in a division
2516   // expression.
2517   status = status && verify_interval(TLABWasteTargetPercent,
2518                                      1, 100, "TLABWasteTargetPercent");
2519 
2520   status = status && verify_object_alignment();
2521 
2522   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2523                                       "CompressedClassSpaceSize");
2524 
2525   status = status && verify_interval(MarkStackSizeMax,
2526                                   1, (max_jint - 1), "MarkStackSizeMax");
2527   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2528 
2529   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2530 
2531   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2532 
2533   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2534 
2535   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2536   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2537 
2538   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2539 
2540   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2541   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2542   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2543   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2544 
2545   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2546   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2547 
2548   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2549   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2550   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2551 
2552   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2553   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2554 
2555   // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2556   // just for that, so hardcode here.
2557   status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2558   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2559   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2560   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2561 
2562   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2563 #ifdef COMPILER1
2564   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2565 #endif
2566 
2567   if (PrintNMTStatistics) {
2568 #if INCLUDE_NMT
2569     if (MemTracker::tracking_level() == NMT_off) {
2570 #endif // INCLUDE_NMT
2571       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2572       PrintNMTStatistics = false;
2573 #if INCLUDE_NMT
2574     }
2575 #endif
2576   }
2577 
2578   // Need to limit the extent of the padding to reasonable size.
2579   // 8K is well beyond the reasonable HW cache line size, even with the
2580   // aggressive prefetching, while still leaving the room for segregating
2581   // among the distinct pages.
2582   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2583     jio_fprintf(defaultStream::error_stream(),
2584                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2585                 ContendedPaddingWidth, 0, 8192);
2586     status = false;
2587   }
2588 
2589   // Need to enforce the padding not to break the existing field alignments.
2590   // It is sufficient to check against the largest type size.
2591   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2592     jio_fprintf(defaultStream::error_stream(),
2593                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2594                 ContendedPaddingWidth, BytesPerLong);
2595     status = false;
2596   }
2597 
2598   // Check lower bounds of the code cache
2599   // Template Interpreter code is approximately 3X larger in debug builds.
2600   uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2601   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2602     jio_fprintf(defaultStream::error_stream(),
2603                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2604                 os::vm_page_size()/K);
2605     status = false;
2606   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2607     jio_fprintf(defaultStream::error_stream(),
2608                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2609                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2610     status = false;
2611   } else if (ReservedCodeCacheSize < min_code_cache_size) {
2612     jio_fprintf(defaultStream::error_stream(),
2613                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2614                 min_code_cache_size/K);
2615     status = false;
2616   } else if (ReservedCodeCacheSize > 2*G) {
2617     // Code cache size larger than MAXINT is not supported.
2618     jio_fprintf(defaultStream::error_stream(),
2619                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2620                 (2*G)/M);
2621     status = false;
2622   }
2623 
2624   status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2625   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2626 
2627   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2628     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2629   }
2630 
2631 #ifdef COMPILER1
2632   status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2633 #endif
2634 
2635   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2636   // The default CICompilerCount's value is CI_COMPILER_COUNT.
2637   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2638   // Check the minimum number of compiler threads
2639   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2640 
2641   return status;
2642 }
2643 
2644 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2645   const char* option_type) {
2646   if (ignore) return false;
2647 
2648   const char* spacer = " ";
2649   if (option_type == NULL) {
2650     option_type = ++spacer; // Set both to the empty string.
2651   }
2652 
2653   if (os::obsolete_option(option)) {
2654     jio_fprintf(defaultStream::error_stream(),
2655                 "Obsolete %s%soption: %s\n", option_type, spacer,
2656       option->optionString);
2657     return false;
2658   } else {
2659     jio_fprintf(defaultStream::error_stream(),
2660                 "Unrecognized %s%soption: %s\n", option_type, spacer,
2661       option->optionString);
2662     return true;
2663   }
2664 }
2665 
2666 static const char* user_assertion_options[] = {
2667   "-da", "-ea", "-disableassertions", "-enableassertions", 0
2668 };
2669 
2670 static const char* system_assertion_options[] = {
2671   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2672 };
2673 
2674 // Return true if any of the strings in null-terminated array 'names' matches.
2675 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2676 // the option must match exactly.
2677 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2678   bool tail_allowed) {
2679   for (/* empty */; *names != NULL; ++names) {
2680     if (match_option(option, *names, tail)) {
2681       if (**tail == '\0' || tail_allowed && **tail == ':') {
2682         return true;
2683       }
2684     }
2685   }
2686   return false;
2687 }
2688 
2689 bool Arguments::parse_uintx(const char* value,
2690                             uintx* uintx_arg,
2691                             uintx min_size) {
2692 
2693   // Check the sign first since atomull() parses only unsigned values.
2694   bool value_is_positive = !(*value == '-');
2695 
2696   if (value_is_positive) {
2697     julong n;
2698     bool good_return = atomull(value, &n);
2699     if (good_return) {
2700       bool above_minimum = n >= min_size;
2701       bool value_is_too_large = n > max_uintx;
2702 
2703       if (above_minimum && !value_is_too_large) {
2704         *uintx_arg = n;
2705         return true;
2706       }
2707     }
2708   }
2709   return false;
2710 }
2711 
2712 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2713                                                   julong* long_arg,
2714                                                   julong min_size) {
2715   if (!atomull(s, long_arg)) return arg_unreadable;
2716   return check_memory_size(*long_arg, min_size);
2717 }
2718 
2719 // Parse JavaVMInitArgs structure
2720 
2721 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2722   // For components of the system classpath.
2723   SysClassPath scp(Arguments::get_sysclasspath());
2724   bool scp_assembly_required = false;
2725 
2726   // Save default settings for some mode flags
2727   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2728   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
2729   Arguments::_ClipInlining             = ClipInlining;
2730   Arguments::_BackgroundCompilation    = BackgroundCompilation;
2731 
2732   // Setup flags for mixed which is the default
2733   set_mode_flags(_mixed);
2734 
2735   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2736   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2737   if (result != JNI_OK) {
2738     return result;
2739   }
2740 
2741   // Parse JavaVMInitArgs structure passed in
2742   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2743   if (result != JNI_OK) {
2744     return result;
2745   }
2746 
2747   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2748   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2749   if (result != JNI_OK) {
2750     return result;
2751   }
2752 
2753   // We need to ensure processor and memory resources have been properly
2754   // configured - which may rely on arguments we just processed - before
2755   // doing the final argument processing. Any argument processing that
2756   // needs to know about processor and memory resources must occur after
2757   // this point.
2758 
2759   os::init_container_support();
2760 
2761   // Do final processing now that all arguments have been parsed
2762   result = finalize_vm_init_args(&scp, scp_assembly_required);
2763   if (result != JNI_OK) {
2764     return result;
2765   }
2766 
2767   return JNI_OK;
2768 }
2769 
2770 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2771 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
2772 // are dealing with -agentpath (case where name is a path), otherwise with
2773 // -agentlib
2774 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2775   char *_name;
2776   const char *_hprof = "hprof", *_jdwp = "jdwp";
2777   size_t _len_hprof, _len_jdwp, _len_prefix;
2778 
2779   if (is_path) {
2780     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2781       return false;
2782     }
2783 
2784     _name++;  // skip past last path separator
2785     _len_prefix = strlen(JNI_LIB_PREFIX);
2786 
2787     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2788       return false;
2789     }
2790 
2791     _name += _len_prefix;
2792     _len_hprof = strlen(_hprof);
2793     _len_jdwp = strlen(_jdwp);
2794 
2795     if (strncmp(_name, _hprof, _len_hprof) == 0) {
2796       _name += _len_hprof;
2797     }
2798     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2799       _name += _len_jdwp;
2800     }
2801     else {
2802       return false;
2803     }
2804 
2805     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2806       return false;
2807     }
2808 
2809     return true;
2810   }
2811 
2812   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2813     return true;
2814   }
2815 
2816   return false;
2817 }
2818 
2819 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2820                                        SysClassPath* scp_p,
2821                                        bool* scp_assembly_required_p,
2822                                        Flag::Flags origin) {
2823   // Remaining part of option string
2824   const char* tail;
2825 
2826   // iterate over arguments
2827   for (int index = 0; index < args->nOptions; index++) {
2828     bool is_absolute_path = false;  // for -agentpath vs -agentlib
2829 
2830     const JavaVMOption* option = args->options + index;
2831 
2832     if (!match_option(option, "-Djava.class.path", &tail) &&
2833         !match_option(option, "-Dsun.java.command", &tail) &&
2834         !match_option(option, "-Dsun.java.launcher", &tail)) {
2835 
2836         // add all jvm options to the jvm_args string. This string
2837         // is used later to set the java.vm.args PerfData string constant.
2838         // the -Djava.class.path and the -Dsun.java.command options are
2839         // omitted from jvm_args string as each have their own PerfData
2840         // string constant object.
2841         build_jvm_args(option->optionString);
2842     }
2843 
2844     // -verbose:[class/gc/jni]
2845     if (match_option(option, "-verbose", &tail)) {
2846       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2847         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2848         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2849       } else if (!strcmp(tail, ":gc")) {
2850         FLAG_SET_CMDLINE(bool, PrintGC, true);
2851       } else if (!strcmp(tail, ":jni")) {
2852         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2853       }
2854     // -da / -ea / -disableassertions / -enableassertions
2855     // These accept an optional class/package name separated by a colon, e.g.,
2856     // -da:java.lang.Thread.
2857     } else if (match_option(option, user_assertion_options, &tail, true)) {
2858       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2859       if (*tail == '\0') {
2860         JavaAssertions::setUserClassDefault(enable);
2861       } else {
2862         assert(*tail == ':', "bogus match by match_option()");
2863         JavaAssertions::addOption(tail + 1, enable);
2864       }
2865     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2866     } else if (match_option(option, system_assertion_options, &tail, false)) {
2867       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
2868       JavaAssertions::setSystemClassDefault(enable);
2869     // -bootclasspath:
2870     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2871       scp_p->reset_path(tail);
2872       *scp_assembly_required_p = true;
2873     // -bootclasspath/a:
2874     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2875       scp_p->add_suffix(tail);
2876       *scp_assembly_required_p = true;
2877     // -bootclasspath/p:
2878     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2879       scp_p->add_prefix(tail);
2880       *scp_assembly_required_p = true;
2881     // -Xrun
2882     } else if (match_option(option, "-Xrun", &tail)) {
2883       if (tail != NULL) {
2884         const char* pos = strchr(tail, ':');
2885         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2886         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2887         name[len] = '\0';
2888 
2889         char *options = NULL;
2890         if(pos != NULL) {
2891           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
2892           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2893         }
2894 #if !INCLUDE_JVMTI
2895         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2896           jio_fprintf(defaultStream::error_stream(),
2897             "Profiling and debugging agents are not supported in this VM\n");
2898           return JNI_ERR;
2899         }
2900 #endif // !INCLUDE_JVMTI
2901         add_init_library(name, options);
2902       }
2903     // -agentlib and -agentpath
2904     } else if (match_option(option, "-agentlib:", &tail) ||
2905           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2906       if(tail != NULL) {
2907         const char* pos = strchr(tail, '=');
2908         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2909         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2910         name[len] = '\0';
2911 
2912         char *options = NULL;
2913         if(pos != NULL) {
2914           size_t length = strlen(pos + 1) + 1;
2915           options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2916           jio_snprintf(options, length, "%s", pos + 1);
2917         }
2918 #if !INCLUDE_JVMTI
2919         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2920           jio_fprintf(defaultStream::error_stream(),
2921             "Profiling and debugging agents are not supported in this VM\n");
2922           return JNI_ERR;
2923         }
2924 #endif // !INCLUDE_JVMTI
2925         add_init_agent(name, options, is_absolute_path);
2926       }
2927     // -javaagent
2928     } else if (match_option(option, "-javaagent:", &tail)) {
2929 #if !INCLUDE_JVMTI
2930       jio_fprintf(defaultStream::error_stream(),
2931         "Instrumentation agents are not supported in this VM\n");
2932       return JNI_ERR;
2933 #else
2934       if(tail != NULL) {
2935         size_t length = strlen(tail) + 1;
2936         char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2937         jio_snprintf(options, length, "%s", tail);
2938         add_init_agent("instrument", options, false);
2939       }
2940 #endif // !INCLUDE_JVMTI
2941     // -Xnoclassgc
2942     } else if (match_option(option, "-Xnoclassgc", &tail)) {
2943       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2944     // -Xincgc: i-CMS
2945     } else if (match_option(option, "-Xincgc", &tail)) {
2946       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2947       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2948     // -Xnoincgc: no i-CMS
2949     } else if (match_option(option, "-Xnoincgc", &tail)) {
2950       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2951       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2952     // -Xconcgc
2953     } else if (match_option(option, "-Xconcgc", &tail)) {
2954       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2955     // -Xnoconcgc
2956     } else if (match_option(option, "-Xnoconcgc", &tail)) {
2957       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2958     // -Xbatch
2959     } else if (match_option(option, "-Xbatch", &tail)) {
2960       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2961     // -Xmn for compatibility with other JVM vendors
2962     } else if (match_option(option, "-Xmn", &tail)) {
2963       julong long_initial_young_size = 0;
2964       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2965       if (errcode != arg_in_range) {
2966         jio_fprintf(defaultStream::error_stream(),
2967                     "Invalid initial young generation size: %s\n", option->optionString);
2968         describe_range_error(errcode);
2969         return JNI_EINVAL;
2970       }
2971       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2972       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2973     // -Xms
2974     } else if (match_option(option, "-Xms", &tail)) {
2975       julong long_initial_heap_size = 0;
2976       // an initial heap size of 0 means automatically determine
2977       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2978       if (errcode != arg_in_range) {
2979         jio_fprintf(defaultStream::error_stream(),
2980                     "Invalid initial heap size: %s\n", option->optionString);
2981         describe_range_error(errcode);
2982         return JNI_EINVAL;
2983       }
2984       set_min_heap_size((uintx)long_initial_heap_size);
2985       // Currently the minimum size and the initial heap sizes are the same.
2986       // Can be overridden with -XX:InitialHeapSize.
2987       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2988     // -Xmx
2989     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2990       julong long_max_heap_size = 0;
2991       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2992       if (errcode != arg_in_range) {
2993         jio_fprintf(defaultStream::error_stream(),
2994                     "Invalid maximum heap size: %s\n", option->optionString);
2995         describe_range_error(errcode);
2996         return JNI_EINVAL;
2997       }
2998       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2999     // Xmaxf
3000     } else if (match_option(option, "-Xmaxf", &tail)) {
3001       char* err;
3002       int maxf = (int)(strtod(tail, &err) * 100);
3003       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3004         jio_fprintf(defaultStream::error_stream(),
3005                     "Bad max heap free percentage size: %s\n",
3006                     option->optionString);
3007         return JNI_EINVAL;
3008       } else {
3009         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3010       }
3011     // Xminf
3012     } else if (match_option(option, "-Xminf", &tail)) {
3013       char* err;
3014       int minf = (int)(strtod(tail, &err) * 100);
3015       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3016         jio_fprintf(defaultStream::error_stream(),
3017                     "Bad min heap free percentage size: %s\n",
3018                     option->optionString);
3019         return JNI_EINVAL;
3020       } else {
3021         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3022       }
3023     // -Xss
3024     } else if (match_option(option, "-Xss", &tail)) {
3025       julong long_ThreadStackSize = 0;
3026       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3027       if (errcode != arg_in_range) {
3028         jio_fprintf(defaultStream::error_stream(),
3029                     "Invalid thread stack size: %s\n", option->optionString);
3030         describe_range_error(errcode);
3031         return JNI_EINVAL;
3032       }
3033       // Internally track ThreadStackSize in units of 1024 bytes.
3034       FLAG_SET_CMDLINE(intx, ThreadStackSize,
3035                               round_to((int)long_ThreadStackSize, K) / K);
3036     // -Xoss
3037     } else if (match_option(option, "-Xoss", &tail)) {
3038           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3039     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3040       julong long_CodeCacheExpansionSize = 0;
3041       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3042       if (errcode != arg_in_range) {
3043         jio_fprintf(defaultStream::error_stream(),
3044                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3045                    os::vm_page_size()/K);
3046         return JNI_EINVAL;
3047       }
3048       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3049     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3050                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3051       julong long_ReservedCodeCacheSize = 0;
3052 
3053       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3054       if (errcode != arg_in_range) {
3055         jio_fprintf(defaultStream::error_stream(),
3056                     "Invalid maximum code cache size: %s.\n", option->optionString);
3057         return JNI_EINVAL;
3058       }
3059       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3060       //-XX:IncreaseFirstTierCompileThresholdAt=
3061       } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3062         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3063         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3064           jio_fprintf(defaultStream::error_stream(),
3065                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3066                       option->optionString);
3067           return JNI_EINVAL;
3068         }
3069         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3070     // -green
3071     } else if (match_option(option, "-green", &tail)) {
3072       jio_fprintf(defaultStream::error_stream(),
3073                   "Green threads support not available\n");
3074           return JNI_EINVAL;
3075     // -native
3076     } else if (match_option(option, "-native", &tail)) {
3077           // HotSpot always uses native threads, ignore silently for compatibility
3078     // -Xsqnopause
3079     } else if (match_option(option, "-Xsqnopause", &tail)) {
3080           // EVM option, ignore silently for compatibility
3081     // -Xrs
3082     } else if (match_option(option, "-Xrs", &tail)) {
3083           // Classic/EVM option, new functionality
3084       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3085     } else if (match_option(option, "-Xusealtsigs", &tail)) {
3086           // change default internal VM signals used - lower case for back compat
3087       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3088     // -Xoptimize
3089     } else if (match_option(option, "-Xoptimize", &tail)) {
3090           // EVM option, ignore silently for compatibility
3091     // -Xprof
3092     } else if (match_option(option, "-Xprof", &tail)) {
3093 #if INCLUDE_FPROF
3094       _has_profile = true;
3095 #else // INCLUDE_FPROF
3096       jio_fprintf(defaultStream::error_stream(),
3097         "Flat profiling is not supported in this VM.\n");
3098       return JNI_ERR;
3099 #endif // INCLUDE_FPROF
3100     // -Xconcurrentio
3101     } else if (match_option(option, "-Xconcurrentio", &tail)) {
3102       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3103       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3104       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3105       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3106       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
3107 
3108       // -Xinternalversion
3109     } else if (match_option(option, "-Xinternalversion", &tail)) {
3110       jio_fprintf(defaultStream::output_stream(), "%s\n",
3111                   VM_Version::internal_vm_info_string());
3112       vm_exit(0);
3113 #ifndef PRODUCT
3114     // -Xprintflags
3115     } else if (match_option(option, "-Xprintflags", &tail)) {
3116       CommandLineFlags::printFlags(tty, false);
3117       vm_exit(0);
3118 #endif
3119     // -D
3120     } else if (match_option(option, "-D", &tail)) {
3121       if (CheckEndorsedAndExtDirs) {
3122         if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3123           // abort if -Djava.endorsed.dirs is set
3124           jio_fprintf(defaultStream::output_stream(),
3125             "-Djava.endorsed.dirs will not be supported in a future release.\n"
3126             "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3127           return JNI_EINVAL;
3128         }
3129         if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3130           // abort if -Djava.ext.dirs is set
3131           jio_fprintf(defaultStream::output_stream(),
3132             "-Djava.ext.dirs will not be supported in a future release.\n"
3133             "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3134           return JNI_EINVAL;
3135         }
3136       }
3137 
3138       if (!add_property(tail)) {
3139         return JNI_ENOMEM;
3140       }
3141       // Out of the box management support
3142       if (match_option(option, "-Dcom.sun.management", &tail)) {
3143 #if INCLUDE_MANAGEMENT
3144         FLAG_SET_CMDLINE(bool, ManagementServer, true);
3145 #else
3146         jio_fprintf(defaultStream::output_stream(),
3147           "-Dcom.sun.management is not supported in this VM.\n");
3148         return JNI_ERR;
3149 #endif
3150       }
3151     // -Xint
3152     } else if (match_option(option, "-Xint", &tail)) {
3153           set_mode_flags(_int);
3154     // -Xmixed
3155     } else if (match_option(option, "-Xmixed", &tail)) {
3156           set_mode_flags(_mixed);
3157     // -Xcomp
3158     } else if (match_option(option, "-Xcomp", &tail)) {
3159       // for testing the compiler; turn off all flags that inhibit compilation
3160           set_mode_flags(_comp);
3161     // -Xshare:dump
3162     } else if (match_option(option, "-Xshare:dump", &tail)) {
3163       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3164       set_mode_flags(_int);     // Prevent compilation, which creates objects
3165     // -Xshare:on
3166     } else if (match_option(option, "-Xshare:on", &tail)) {
3167       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3168       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3169     // -Xshare:auto
3170     } else if (match_option(option, "-Xshare:auto", &tail)) {
3171       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3172       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3173     // -Xshare:off
3174     } else if (match_option(option, "-Xshare:off", &tail)) {
3175       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3176       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3177     // -Xverify
3178     } else if (match_option(option, "-Xverify", &tail)) {
3179       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3180         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3181         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3182       } else if (strcmp(tail, ":remote") == 0) {
3183         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3184         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3185       } else if (strcmp(tail, ":none") == 0) {
3186         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3187         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3188       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3189         return JNI_EINVAL;
3190       }
3191     // -Xdebug
3192     } else if (match_option(option, "-Xdebug", &tail)) {
3193       // note this flag has been used, then ignore
3194       set_xdebug_mode(true);
3195     // -Xnoagent
3196     } else if (match_option(option, "-Xnoagent", &tail)) {
3197       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3198     } else if (match_option(option, "-Xboundthreads", &tail)) {
3199       // Bind user level threads to kernel threads (Solaris only)
3200       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3201     } else if (match_option(option, "-Xloggc:", &tail)) {
3202       // Redirect GC output to the file. -Xloggc:<filename>
3203       // ostream_init_log(), when called will use this filename
3204       // to initialize a fileStream.
3205       _gc_log_filename = strdup(tail);
3206      if (!is_filename_valid(_gc_log_filename)) {
3207        jio_fprintf(defaultStream::output_stream(),
3208                   "Invalid file name for use with -Xloggc: Filename can only contain the "
3209                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3210                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
3211         return JNI_EINVAL;
3212       }
3213       FLAG_SET_CMDLINE(bool, PrintGC, true);
3214       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3215 
3216     // JNI hooks
3217     } else if (match_option(option, "-Xcheck", &tail)) {
3218       if (!strcmp(tail, ":jni")) {
3219 #if !INCLUDE_JNI_CHECK
3220         warning("JNI CHECKING is not supported in this VM");
3221 #else
3222         CheckJNICalls = true;
3223 #endif // INCLUDE_JNI_CHECK
3224       } else if (is_bad_option(option, args->ignoreUnrecognized,
3225                                      "check")) {
3226         return JNI_EINVAL;
3227       }
3228     } else if (match_option(option, "vfprintf", &tail)) {
3229       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3230     } else if (match_option(option, "exit", &tail)) {
3231       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3232     } else if (match_option(option, "abort", &tail)) {
3233       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3234     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3235       // The last option must always win.
3236       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3237       FLAG_SET_CMDLINE(bool, NeverTenure, true);
3238     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3239       // The last option must always win.
3240       FLAG_SET_CMDLINE(bool, NeverTenure, false);
3241       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3242     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3243                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3244       jio_fprintf(defaultStream::error_stream(),
3245         "Please use CMSClassUnloadingEnabled in place of "
3246         "CMSPermGenSweepingEnabled in the future\n");
3247     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3248       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3249       jio_fprintf(defaultStream::error_stream(),
3250         "Please use -XX:+UseGCOverheadLimit in place of "
3251         "-XX:+UseGCTimeLimit in the future\n");
3252     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3253       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3254       jio_fprintf(defaultStream::error_stream(),
3255         "Please use -XX:-UseGCOverheadLimit in place of "
3256         "-XX:-UseGCTimeLimit in the future\n");
3257     // The TLE options are for compatibility with 1.3 and will be
3258     // removed without notice in a future release.  These options
3259     // are not to be documented.
3260     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3261       // No longer used.
3262     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3263       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3264     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3265       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3266     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3267       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3268     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3269       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3270     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3271       // No longer used.
3272     } else if (match_option(option, "-XX:TLESize=", &tail)) {
3273       julong long_tlab_size = 0;
3274       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3275       if (errcode != arg_in_range) {
3276         jio_fprintf(defaultStream::error_stream(),
3277                     "Invalid TLAB size: %s\n", option->optionString);
3278         describe_range_error(errcode);
3279         return JNI_EINVAL;
3280       }
3281       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3282     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3283       // No longer used.
3284     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3285       FLAG_SET_CMDLINE(bool, UseTLAB, true);
3286     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3287       FLAG_SET_CMDLINE(bool, UseTLAB, false);
3288     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3289       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3290       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3291     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3292       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3293       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3294     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3295 #if defined(DTRACE_ENABLED)
3296       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3297       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3298       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3299       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3300 #else // defined(DTRACE_ENABLED)
3301       jio_fprintf(defaultStream::error_stream(),
3302                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3303       return JNI_EINVAL;
3304 #endif // defined(DTRACE_ENABLED)
3305 #ifdef ASSERT
3306     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3307       FLAG_SET_CMDLINE(bool, FullGCALot, true);
3308       // disable scavenge before parallel mark-compact
3309       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3310 #endif
3311     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3312       julong cms_blocks_to_claim = (julong)atol(tail);
3313       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3314       jio_fprintf(defaultStream::error_stream(),
3315         "Please use -XX:OldPLABSize in place of "
3316         "-XX:CMSParPromoteBlocksToClaim in the future\n");
3317     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3318       julong cms_blocks_to_claim = (julong)atol(tail);
3319       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3320       jio_fprintf(defaultStream::error_stream(),
3321         "Please use -XX:OldPLABSize in place of "
3322         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3323     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3324       julong old_plab_size = 0;
3325       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3326       if (errcode != arg_in_range) {
3327         jio_fprintf(defaultStream::error_stream(),
3328                     "Invalid old PLAB size: %s\n", option->optionString);
3329         describe_range_error(errcode);
3330         return JNI_EINVAL;
3331       }
3332       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3333       jio_fprintf(defaultStream::error_stream(),
3334                   "Please use -XX:OldPLABSize in place of "
3335                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3336     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3337       julong young_plab_size = 0;
3338       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3339       if (errcode != arg_in_range) {
3340         jio_fprintf(defaultStream::error_stream(),
3341                     "Invalid young PLAB size: %s\n", option->optionString);
3342         describe_range_error(errcode);
3343         return JNI_EINVAL;
3344       }
3345       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3346       jio_fprintf(defaultStream::error_stream(),
3347                   "Please use -XX:YoungPLABSize in place of "
3348                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3349     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3350                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3351       julong stack_size = 0;
3352       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3353       if (errcode != arg_in_range) {
3354         jio_fprintf(defaultStream::error_stream(),
3355                     "Invalid mark stack size: %s\n", option->optionString);
3356         describe_range_error(errcode);
3357         return JNI_EINVAL;
3358       }
3359       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3360     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3361       julong max_stack_size = 0;
3362       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3363       if (errcode != arg_in_range) {
3364         jio_fprintf(defaultStream::error_stream(),
3365                     "Invalid maximum mark stack size: %s\n",
3366                     option->optionString);
3367         describe_range_error(errcode);
3368         return JNI_EINVAL;
3369       }
3370       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3371     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3372                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3373       uintx conc_threads = 0;
3374       if (!parse_uintx(tail, &conc_threads, 1)) {
3375         jio_fprintf(defaultStream::error_stream(),
3376                     "Invalid concurrent threads: %s\n", option->optionString);
3377         return JNI_EINVAL;
3378       }
3379       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3380     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3381       julong max_direct_memory_size = 0;
3382       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3383       if (errcode != arg_in_range) {
3384         jio_fprintf(defaultStream::error_stream(),
3385                     "Invalid maximum direct memory size: %s\n",
3386                     option->optionString);
3387         describe_range_error(errcode);
3388         return JNI_EINVAL;
3389       }
3390       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3391     } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3392       // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3393       //       away and will cause VM initialization failures!
3394       warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3395       FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3396 #if !INCLUDE_MANAGEMENT
3397     } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3398         jio_fprintf(defaultStream::error_stream(),
3399           "ManagementServer is not supported in this VM.\n");
3400         return JNI_ERR;
3401 #endif // INCLUDE_MANAGEMENT




3402     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3403       // Skip -XX:Flags= since that case has already been handled
3404       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3405         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3406           return JNI_EINVAL;
3407         }
3408       }
3409     // Unknown option
3410     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3411       return JNI_ERR;
3412     }
3413   }
3414 
3415   // PrintSharedArchiveAndExit will turn on
3416   //   -Xshare:on
3417   //   -XX:+TraceClassPaths
3418   if (PrintSharedArchiveAndExit) {
3419     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3420     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3421     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3422   }
3423 
3424   // Change the default value for flags  which have different default values
3425   // when working with older JDKs.
3426 #ifdef LINUX
3427  if (JDK_Version::current().compare_major(6) <= 0 &&
3428       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3429     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3430   }
3431 #endif // LINUX
3432   fix_appclasspath();
3433   return JNI_OK;
3434 }
3435 
3436 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3437 //
3438 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3439 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3440 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3441 // path is treated as the current directory.
3442 //
3443 // This causes problems with CDS, which requires that all directories specified in the classpath
3444 // must be empty. In most cases, applications do NOT want to load classes from the current
3445 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3446 // scripts compatible with CDS.
3447 void Arguments::fix_appclasspath() {
3448   if (IgnoreEmptyClassPaths) {
3449     const char separator = *os::path_separator();
3450     const char* src = _java_class_path->value();
3451 
3452     // skip over all the leading empty paths
3453     while (*src == separator) {
3454       src ++;
3455     }
3456 
3457     char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3458     strncpy(copy, src, strlen(src) + 1);
3459 
3460     // trim all trailing empty paths
3461     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3462       *tail = '\0';
3463     }
3464 
3465     char from[3] = {separator, separator, '\0'};
3466     char to  [2] = {separator, '\0'};
3467     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3468       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3469       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3470     }
3471 
3472     _java_class_path->set_value(copy);
3473     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3474   }
3475 
3476   if (!PrintSharedArchiveAndExit) {
3477     ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3478   }
3479 }
3480 
3481 static bool has_jar_files(const char* directory) {
3482   DIR* dir = os::opendir(directory);
3483   if (dir == NULL) return false;
3484 
3485   struct dirent *entry;
3486   bool hasJarFile = false;
3487   while (!hasJarFile && (entry = os::readdir(dir)) != NULL) {
3488     const char* name = entry->d_name;
3489     const char* ext = name + strlen(name) - 4;
3490     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3491   }
3492   os::closedir(dir);
3493   return hasJarFile ;
3494 }
3495 
3496 // returns the number of directories in the given path containing JAR files
3497 // If the skip argument is not NULL, it will skip that directory
3498 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3499   const char separator = *os::path_separator();
3500   const char* const end = path + strlen(path);
3501   int nonEmptyDirs = 0;
3502   while (path < end) {
3503     const char* tmp_end = strchr(path, separator);
3504     if (tmp_end == NULL) {
3505       if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3506         nonEmptyDirs++;
3507         jio_fprintf(defaultStream::output_stream(),
3508           "Non-empty %s directory: %s\n", type, path);
3509       }
3510       path = end;
3511     } else {
3512       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3513       memcpy(dirpath, path, tmp_end - path);
3514       dirpath[tmp_end - path] = '\0';
3515       if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3516         nonEmptyDirs++;
3517         jio_fprintf(defaultStream::output_stream(),
3518           "Non-empty %s directory: %s\n", type, dirpath);
3519       }
3520       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3521       path = tmp_end + 1;
3522     }
3523   }
3524   return nonEmptyDirs;
3525 }
3526 
3527 // Returns true if endorsed standards override mechanism and extension mechanism
3528 // are not used.
3529 static bool check_endorsed_and_ext_dirs() {
3530   if (!CheckEndorsedAndExtDirs)
3531     return true;
3532 
3533   char endorsedDir[JVM_MAXPATHLEN];
3534   char extDir[JVM_MAXPATHLEN];
3535   const char* fileSep = os::file_separator();
3536   jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3537                Arguments::get_java_home(), fileSep, fileSep);
3538   jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3539                Arguments::get_java_home(), fileSep, fileSep);
3540 
3541   // check endorsed directory
3542   int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3543 
3544   // check the extension directories but skip the default lib/ext directory
3545   nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3546 
3547   // List of JAR files installed in the default lib/ext directory.
3548   // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3549   static const char* jdk_ext_jars[] = {
3550       "access-bridge-32.jar",
3551       "access-bridge-64.jar",
3552       "access-bridge.jar",
3553       "cldrdata.jar",
3554       "dnsns.jar",
3555       "jaccess.jar",
3556       "jfxrt.jar",
3557       "localedata.jar",
3558       "nashorn.jar",
3559       "sunec.jar",
3560       "sunjce_provider.jar",
3561       "sunmscapi.jar",
3562       "sunpkcs11.jar",
3563       "ucrypto.jar",
3564       "zipfs.jar",
3565       NULL
3566   };
3567 
3568   // check if the default lib/ext directory has any non-JDK jar files; if so, error
3569   DIR* dir = os::opendir(extDir);
3570   if (dir != NULL) {
3571     int num_ext_jars = 0;
3572     struct dirent *entry;
3573     while ((entry = os::readdir(dir)) != NULL) {
3574       const char* name = entry->d_name;
3575       const char* ext = name + strlen(name) - 4;
3576       if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3577         bool is_jdk_jar = false;
3578         const char* jarfile = NULL;
3579         for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3580           if (os::file_name_strcmp(name, jarfile) == 0) {
3581             is_jdk_jar = true;
3582             break;
3583           }
3584         }
3585         if (!is_jdk_jar) {
3586           jio_fprintf(defaultStream::output_stream(),
3587             "%s installed in <JAVA_HOME>/lib/ext\n", name);
3588           num_ext_jars++;
3589         }
3590       }
3591     }
3592     os::closedir(dir);
3593     if (num_ext_jars > 0) {
3594       nonEmptyDirs += 1;
3595     }
3596   }
3597 
3598   // check if the default lib/endorsed directory exists; if so, error
3599   dir = os::opendir(endorsedDir);
3600   if (dir != NULL) {
3601     jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3602     os::closedir(dir);
3603     nonEmptyDirs += 1;
3604   }
3605 
3606   if (nonEmptyDirs > 0) {
3607     jio_fprintf(defaultStream::output_stream(),
3608       "Endorsed standards override mechanism and extension mechanism "
3609       "will not be supported in a future release.\n"
3610       "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3611     return false;
3612   }
3613 
3614   return true;
3615 }
3616 
3617 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3618   // This must be done after all -D arguments have been processed.
3619   scp_p->expand_endorsed();
3620 
3621   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3622     // Assemble the bootclasspath elements into the final path.
3623     Arguments::set_sysclasspath(scp_p->combined_path());
3624   }
3625 
3626   if (!check_endorsed_and_ext_dirs()) {
3627     return JNI_ERR;
3628   }
3629 
3630   // This must be done after all arguments have been processed
3631   // and the container support has been initialized since AggressiveHeap
3632   // relies on the amount of total memory available.
3633   if (AggressiveHeap) {
3634     jint result = set_aggressive_heap_flags();
3635     if (result != JNI_OK) {
3636       return result;
3637     }
3638   }
3639   // This must be done after all arguments have been processed.
3640   // java_compiler() true means set to "NONE" or empty.
3641   if (java_compiler() && !xdebug_mode()) {
3642     // For backwards compatibility, we switch to interpreted mode if
3643     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3644     // not specified.
3645     set_mode_flags(_int);
3646   }
3647   if (CompileThreshold == 0) {
3648     set_mode_flags(_int);
3649   }
3650 
3651   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3652   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3653     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3654   }
3655 
3656 #ifndef COMPILER2
3657   // Don't degrade server performance for footprint
3658   if (FLAG_IS_DEFAULT(UseLargePages) &&
3659       MaxHeapSize < LargePageHeapSizeThreshold) {
3660     // No need for large granularity pages w/small heaps.
3661     // Note that large pages are enabled/disabled for both the
3662     // Java heap and the code cache.
3663     FLAG_SET_DEFAULT(UseLargePages, false);
3664   }
3665 
3666 #else
3667   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3668     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3669   }
3670 #endif
3671 
3672 #ifndef TIERED
3673   // Tiered compilation is undefined.
3674   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3675 #endif
3676 
3677   // If we are running in a headless jre, force java.awt.headless property
3678   // to be true unless the property has already been set.
3679   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3680   if (os::is_headless_jre()) {
3681     const char* headless = Arguments::get_property("java.awt.headless");
3682     if (headless == NULL) {
3683       char envbuffer[128];
3684       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3685         if (!add_property("java.awt.headless=true")) {
3686           return JNI_ENOMEM;
3687         }
3688       } else {
3689         char buffer[256];
3690         jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3691         if (!add_property(buffer)) {
3692           return JNI_ENOMEM;
3693         }
3694       }
3695     }
3696   }
3697 
3698   if (!check_vm_args_consistency()) {
3699     return JNI_ERR;
3700   }
3701 
3702   return JNI_OK;
3703 }
3704 
3705 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3706   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3707                                             scp_assembly_required_p);
3708 }
3709 
3710 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3711   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3712                                             scp_assembly_required_p);
3713 }
3714 
3715 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3716   const int N_MAX_OPTIONS = 64;
3717   const int OPTION_BUFFER_SIZE = 1024;
3718   char buffer[OPTION_BUFFER_SIZE];
3719 
3720   // The variable will be ignored if it exceeds the length of the buffer.
3721   // Don't check this variable if user has special privileges
3722   // (e.g. unix su command).
3723   if (os::getenv(name, buffer, sizeof(buffer)) &&
3724       !os::have_special_privileges()) {
3725     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
3726     jio_fprintf(defaultStream::error_stream(),
3727                 "Picked up %s: %s\n", name, buffer);
3728     char* rd = buffer;                        // pointer to the input string (rd)
3729     int i;
3730     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
3731       while (isspace(*rd)) rd++;              // skip whitespace
3732       if (*rd == 0) break;                    // we re done when the input string is read completely
3733 
3734       // The output, option string, overwrites the input string.
3735       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3736       // input string (rd).
3737       char* wrt = rd;
3738 
3739       options[i++].optionString = wrt;        // Fill in option
3740       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
3741         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
3742           int quote = *rd;                    // matching quote to look for
3743           rd++;                               // don't copy open quote
3744           while (*rd != quote) {              // include everything (even spaces) up until quote
3745             if (*rd == 0) {                   // string termination means unmatched string
3746               jio_fprintf(defaultStream::error_stream(),
3747                           "Unmatched quote in %s\n", name);
3748               return JNI_ERR;
3749             }
3750             *wrt++ = *rd++;                   // copy to option string
3751           }
3752           rd++;                               // don't copy close quote
3753         } else {
3754           *wrt++ = *rd++;                     // copy to option string
3755         }
3756       }
3757       // Need to check if we're done before writing a NULL,
3758       // because the write could be to the byte that rd is pointing to.
3759       if (*rd++ == 0) {
3760         *wrt = 0;
3761         break;
3762       }
3763       *wrt = 0;                               // Zero terminate option
3764     }
3765     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3766     JavaVMInitArgs vm_args;
3767     vm_args.version = JNI_VERSION_1_2;
3768     vm_args.options = options;
3769     vm_args.nOptions = i;
3770     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3771 
3772     if (PrintVMOptions) {
3773       const char* tail;
3774       for (int i = 0; i < vm_args.nOptions; i++) {
3775         const JavaVMOption *option = vm_args.options + i;
3776         if (match_option(option, "-XX:", &tail)) {
3777           logOption(tail);
3778         }
3779       }
3780     }
3781 
3782     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3783   }
3784   return JNI_OK;
3785 }
3786 
3787 void Arguments::set_shared_spaces_flags() {
3788   if (DumpSharedSpaces) {
3789     if (FailOverToOldVerifier) {
3790       // Don't fall back to the old verifier on verification failure. If a
3791       // class fails verification with the split verifier, it might fail the
3792       // CDS runtime verifier constraint check. In that case, we don't want
3793       // to share the class. We only archive classes that pass the split verifier.
3794       FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3795     }
3796 
3797     if (RequireSharedSpaces) {
3798       warning("cannot dump shared archive while using shared archive");
3799     }
3800     UseSharedSpaces = false;
3801 #ifdef _LP64
3802     if (!UseCompressedOops || !UseCompressedClassPointers) {
3803       vm_exit_during_initialization(
3804         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3805     }
3806   } else {
3807     if (!UseCompressedOops || !UseCompressedClassPointers) {
3808       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3809     }
3810 #endif
3811   }
3812 }
3813 
3814 #if !INCLUDE_ALL_GCS
3815 static void force_serial_gc() {
3816   FLAG_SET_DEFAULT(UseSerialGC, true);
3817   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
3818   UNSUPPORTED_GC_OPTION(UseG1GC);
3819   UNSUPPORTED_GC_OPTION(UseParallelGC);
3820   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3821   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3822   UNSUPPORTED_GC_OPTION(UseParNewGC);
3823 }
3824 #endif // INCLUDE_ALL_GCS
3825 
3826 // Sharing support
3827 // Construct the path to the archive
3828 static char* get_shared_archive_path() {
3829   char *shared_archive_path;
3830   if (SharedArchiveFile == NULL) {
3831     char jvm_path[JVM_MAXPATHLEN];
3832     os::jvm_path(jvm_path, sizeof(jvm_path));
3833     char *end = strrchr(jvm_path, *os::file_separator());
3834     if (end != NULL) *end = '\0';
3835     size_t jvm_path_len = strlen(jvm_path);
3836     size_t file_sep_len = strlen(os::file_separator());
3837     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3838         file_sep_len + 20, mtInternal);
3839     if (shared_archive_path != NULL) {
3840       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3841       strncat(shared_archive_path, os::file_separator(), file_sep_len);
3842       strncat(shared_archive_path, "classes.jsa", 11);
3843     }
3844   } else {
3845     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3846     if (shared_archive_path != NULL) {
3847       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3848     }
3849   }
3850   return shared_archive_path;
3851 }
3852 
3853 #ifndef PRODUCT
3854 // Determine whether LogVMOutput should be implicitly turned on.
3855 static bool use_vm_log() {
3856   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3857       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3858       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3859       PrintAssembly || TraceDeoptimization || TraceDependencies ||
3860       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3861     return true;
3862   }
3863 
3864 #ifdef COMPILER1
3865   if (PrintC1Statistics) {
3866     return true;
3867   }
3868 #endif // COMPILER1
3869 
3870 #ifdef COMPILER2
3871   if (PrintOptoAssembly || PrintOptoStatistics) {
3872     return true;
3873   }
3874 #endif // COMPILER2
3875 
3876   return false;
3877 }
3878 #endif // PRODUCT
3879 
3880 // Parse entry point called from JNI_CreateJavaVM
3881 
3882 jint Arguments::parse(const JavaVMInitArgs* args) {
3883 
3884   // Remaining part of option string
3885   const char* tail;
3886 
3887   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3888   const char* hotspotrc = ".hotspotrc";
3889   bool settings_file_specified = false;
3890   bool needs_hotspotrc_warning = false;
3891 
3892   ArgumentsExt::process_options(args);
3893 
3894   const char* flags_file;
3895   int index;
3896   for (index = 0; index < args->nOptions; index++) {
3897     const JavaVMOption *option = args->options + index;
3898     if (match_option(option, "-XX:Flags=", &tail)) {
3899       flags_file = tail;
3900       settings_file_specified = true;
3901     }
3902     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3903       PrintVMOptions = true;
3904     }
3905     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3906       PrintVMOptions = false;
3907     }
3908     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3909       IgnoreUnrecognizedVMOptions = true;
3910     }
3911     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3912       IgnoreUnrecognizedVMOptions = false;
3913     }
3914     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3915       CommandLineFlags::printFlags(tty, false);
3916       vm_exit(0);
3917     }
3918     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3919 #if INCLUDE_NMT
3920       // The launcher did not setup nmt environment variable properly.
3921       if (!MemTracker::check_launcher_nmt_support(tail)) {
3922         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3923       }
3924 
3925       // Verify if nmt option is valid.
3926       if (MemTracker::verify_nmt_option()) {
3927         // Late initialization, still in single-threaded mode.
3928         if (MemTracker::tracking_level() >= NMT_summary) {
3929           MemTracker::init();
3930         }
3931       } else {
3932         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3933       }
3934 #else
3935       jio_fprintf(defaultStream::error_stream(),
3936         "Native Memory Tracking is not supported in this VM\n");
3937       return JNI_ERR;
3938 #endif
3939     }
3940 
3941 
3942 #ifndef PRODUCT
3943     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3944       CommandLineFlags::printFlags(tty, true);
3945       vm_exit(0);
3946     }
3947 #endif
3948   }
3949 
3950   if (IgnoreUnrecognizedVMOptions) {
3951     // uncast const to modify the flag args->ignoreUnrecognized
3952     *(jboolean*)(&args->ignoreUnrecognized) = true;
3953   }
3954 
3955   // Parse specified settings file
3956   if (settings_file_specified) {
3957     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3958       return JNI_EINVAL;
3959     }
3960   } else {
3961 #ifdef ASSERT
3962     // Parse default .hotspotrc settings file
3963     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3964       return JNI_EINVAL;
3965     }
3966 #else
3967     struct stat buf;
3968     if (os::stat(hotspotrc, &buf) == 0) {
3969       needs_hotspotrc_warning = true;
3970     }
3971 #endif
3972   }
3973 
3974   if (PrintVMOptions) {
3975     for (index = 0; index < args->nOptions; index++) {
3976       const JavaVMOption *option = args->options + index;
3977       if (match_option(option, "-XX:", &tail)) {
3978         logOption(tail);
3979       }
3980     }
3981   }
3982 
3983   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3984   jint result = parse_vm_init_args(args);
3985   if (result != JNI_OK) {
3986     return result;
3987   }
3988 
3989   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3990   SharedArchivePath = get_shared_archive_path();
3991   if (SharedArchivePath == NULL) {
3992     return JNI_ENOMEM;
3993   }
3994 
3995   // Set up VerifySharedSpaces
3996   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3997     VerifySharedSpaces = true;
3998   }
3999 
4000   // Delay warning until here so that we've had a chance to process
4001   // the -XX:-PrintWarnings flag
4002   if (needs_hotspotrc_warning) {
4003     warning("%s file is present but has been ignored.  "
4004             "Run with -XX:Flags=%s to load the file.",
4005             hotspotrc, hotspotrc);
4006   }
4007 
4008 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
4009   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4010 #endif
4011 
4012 #if INCLUDE_ALL_GCS
4013   #if (defined JAVASE_EMBEDDED || defined ARM)
4014     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4015   #endif
4016 #endif
4017 
4018 #ifndef PRODUCT
4019   if (TraceBytecodesAt != 0) {
4020     TraceBytecodes = true;
4021   }
4022   if (CountCompiledCalls) {
4023     if (UseCounterDecay) {
4024       warning("UseCounterDecay disabled because CountCalls is set");
4025       UseCounterDecay = false;
4026     }
4027   }
4028 #endif // PRODUCT
4029 
4030   // JSR 292 is not supported before 1.7
4031   if (!JDK_Version::is_gte_jdk17x_version()) {
4032     if (EnableInvokeDynamic) {
4033       if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4034         warning("JSR 292 is not supported before 1.7.  Disabling support.");
4035       }
4036       EnableInvokeDynamic = false;
4037     }
4038   }
4039 
4040   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4041     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4042       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4043     }
4044     ScavengeRootsInCode = 1;
4045   }
4046 
4047   if (PrintGCDetails) {
4048     // Turn on -verbose:gc options as well
4049     PrintGC = true;
4050   }
4051 
4052   if (!JDK_Version::is_gte_jdk18x_version()) {
4053     // To avoid changing the log format for 7 updates this flag is only
4054     // true by default in JDK8 and above.
4055     if (FLAG_IS_DEFAULT(PrintGCCause)) {
4056       FLAG_SET_DEFAULT(PrintGCCause, false);
4057     }
4058   }
4059 
4060   // Set object alignment values.
4061   set_object_alignment();
4062 
4063 #if !INCLUDE_ALL_GCS
4064   force_serial_gc();
4065 #endif // INCLUDE_ALL_GCS
4066 #if !INCLUDE_CDS
4067   if (DumpSharedSpaces || RequireSharedSpaces) {
4068     jio_fprintf(defaultStream::error_stream(),
4069       "Shared spaces are not supported in this VM\n");
4070     return JNI_ERR;
4071   }
4072   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4073     warning("Shared spaces are not supported in this VM");
4074     FLAG_SET_DEFAULT(UseSharedSpaces, false);
4075     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4076   }
4077   no_shared_spaces("CDS Disabled");
4078 #endif // INCLUDE_CDS
4079 
4080   return JNI_OK;
4081 }
4082 
4083 jint Arguments::apply_ergo() {
4084 
4085   // Set flags based on ergonomics.
4086   set_ergonomics_flags();
4087 
4088   set_shared_spaces_flags();
4089 
4090 #if defined(SPARC)
4091   // BIS instructions require 'membar' instruction regardless of the number
4092   // of CPUs because in virtualized/container environments which might use only 1
4093   // CPU, BIS instructions may produce incorrect results.
4094 
4095   if (FLAG_IS_DEFAULT(AssumeMP)) {
4096     FLAG_SET_DEFAULT(AssumeMP, true);
4097   }
4098 #endif
4099 
4100   // Check the GC selections again.
4101   if (!check_gc_consistency()) {
4102     return JNI_EINVAL;
4103   }
4104 
4105   if (TieredCompilation) {
4106     set_tiered_flags();
4107   } else {
4108     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4109     if (CompilationPolicyChoice >= 2) {
4110       vm_exit_during_initialization(
4111         "Incompatible compilation policy selected", NULL);
4112     }
4113   }
4114   // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4115   if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4116     FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4117   }
4118 
4119 
4120   // Set heap size based on available physical memory
4121   set_heap_size();
4122 
4123   ArgumentsExt::set_gc_specific_flags();
4124 
4125   // Initialize Metaspace flags and alignments.
4126   Metaspace::ergo_initialize();
4127 
4128   // Set bytecode rewriting flags
4129   set_bytecode_flags();
4130 
4131   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4132   set_aggressive_opts_flags();
4133 
4134   // Turn off biased locking for locking debug mode flags,
4135   // which are subtlely different from each other but neither works with
4136   // biased locking.
4137   if (UseHeavyMonitors
4138 #ifdef COMPILER1
4139       || !UseFastLocking
4140 #endif // COMPILER1
4141     ) {
4142     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4143       // flag set to true on command line; warn the user that they
4144       // can't enable biased locking here
4145       warning("Biased Locking is not supported with locking debug flags"
4146               "; ignoring UseBiasedLocking flag." );
4147     }
4148     UseBiasedLocking = false;
4149   }
4150 
4151 #ifdef ZERO
4152   // Clear flags not supported on zero.
4153   FLAG_SET_DEFAULT(ProfileInterpreter, false);
4154   FLAG_SET_DEFAULT(UseBiasedLocking, false);
4155   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4156   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4157 #endif // CC_INTERP
4158 
4159 #ifdef COMPILER2
4160   if (!EliminateLocks) {
4161     EliminateNestedLocks = false;
4162   }
4163   if (!Inline) {
4164     IncrementalInline = false;
4165   }
4166 #ifndef PRODUCT
4167   if (!IncrementalInline) {
4168     AlwaysIncrementalInline = false;
4169   }
4170 #endif
4171   if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4172     // incremental inlining: bump MaxNodeLimit
4173     FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4174   }
4175   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4176     // nothing to use the profiling, turn if off
4177     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4178   }
4179 #endif
4180 
4181   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4182     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4183     DebugNonSafepoints = true;
4184   }
4185 
4186   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4187     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4188   }
4189 
4190   if (UseOnStackReplacement && !UseLoopCounter) {
4191     warning("On-stack-replacement requires loop counters; enabling loop counters");
4192     FLAG_SET_DEFAULT(UseLoopCounter, true);
4193   }
4194 
4195 #ifndef PRODUCT
4196   if (CompileTheWorld) {
4197     // Force NmethodSweeper to sweep whole CodeCache each time.
4198     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4199       NmethodSweepFraction = 1;
4200     }
4201   }
4202 
4203   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4204     if (use_vm_log()) {
4205       LogVMOutput = true;
4206     }
4207   }
4208 #endif // PRODUCT
4209 
4210   if (PrintCommandLineFlags) {
4211     CommandLineFlags::printSetFlags(tty);
4212   }
4213 
4214   // Apply CPU specific policy for the BiasedLocking
4215   if (UseBiasedLocking) {
4216     if (!VM_Version::use_biased_locking() &&
4217         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4218       UseBiasedLocking = false;
4219     }
4220   }
4221 #ifdef COMPILER2
4222   if (!UseBiasedLocking || EmitSync != 0) {
4223     UseOptoBiasInlining = false;
4224   }
4225 #endif
4226 
4227   // set PauseAtExit if the gamma launcher was used and a debugger is attached
4228   // but only if not already set on the commandline
4229   if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4230     bool set = false;
4231     CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4232     if (!set) {
4233       FLAG_SET_DEFAULT(PauseAtExit, true);
4234     }
4235   }
4236 
4237   return JNI_OK;
4238 }
4239 
4240 jint Arguments::adjust_after_os() {
4241   if (UseNUMA) {
4242     if (UseParallelGC || UseParallelOldGC) {
4243       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4244          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4245       }
4246     }
4247     // UseNUMAInterleaving is set to ON for all collectors and
4248     // platforms when UseNUMA is set to ON. NUMA-aware collectors
4249     // such as the parallel collector for Linux and Solaris will
4250     // interleave old gen and survivor spaces on top of NUMA
4251     // allocation policy for the eden space.
4252     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4253     // all platforms and ParallelGC on Windows will interleave all
4254     // of the heap spaces across NUMA nodes.
4255     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4256       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4257     }
4258   }
4259   return JNI_OK;
4260 }
4261 
4262 int Arguments::PropertyList_count(SystemProperty* pl) {
4263   int count = 0;
4264   while(pl != NULL) {
4265     count++;
4266     pl = pl->next();
4267   }
4268   return count;
4269 }
4270 
4271 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4272   assert(key != NULL, "just checking");
4273   SystemProperty* prop;
4274   for (prop = pl; prop != NULL; prop = prop->next()) {
4275     if (strcmp(key, prop->key()) == 0) return prop->value();
4276   }
4277   return NULL;
4278 }
4279 
4280 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4281   int count = 0;
4282   const char* ret_val = NULL;
4283 
4284   while(pl != NULL) {
4285     if(count >= index) {
4286       ret_val = pl->key();
4287       break;
4288     }
4289     count++;
4290     pl = pl->next();
4291   }
4292 
4293   return ret_val;
4294 }
4295 
4296 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4297   int count = 0;
4298   char* ret_val = NULL;
4299 
4300   while(pl != NULL) {
4301     if(count >= index) {
4302       ret_val = pl->value();
4303       break;
4304     }
4305     count++;
4306     pl = pl->next();
4307   }
4308 
4309   return ret_val;
4310 }
4311 
4312 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4313   SystemProperty* p = *plist;
4314   if (p == NULL) {
4315     *plist = new_p;
4316   } else {
4317     while (p->next() != NULL) {
4318       p = p->next();
4319     }
4320     p->set_next(new_p);
4321   }
4322 }
4323 
4324 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4325   if (plist == NULL)
4326     return;
4327 
4328   SystemProperty* new_p = new SystemProperty(k, v, true);
4329   PropertyList_add(plist, new_p);
4330 }
4331 
4332 // This add maintains unique property key in the list.
4333 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4334   if (plist == NULL)
4335     return;
4336 
4337   // If property key exist then update with new value.
4338   SystemProperty* prop;
4339   for (prop = *plist; prop != NULL; prop = prop->next()) {
4340     if (strcmp(k, prop->key()) == 0) {
4341       if (append) {
4342         prop->append_value(v);
4343       } else {
4344         prop->set_value(v);
4345       }
4346       return;
4347     }
4348   }
4349 
4350   PropertyList_add(plist, k, v);
4351 }
4352 
4353 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4354 // Returns true if all of the source pointed by src has been copied over to
4355 // the destination buffer pointed by buf. Otherwise, returns false.
4356 // Notes:
4357 // 1. If the length (buflen) of the destination buffer excluding the
4358 // NULL terminator character is not long enough for holding the expanded
4359 // pid characters, it also returns false instead of returning the partially
4360 // expanded one.
4361 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4362 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4363                                 char* buf, size_t buflen) {
4364   const char* p = src;
4365   char* b = buf;
4366   const char* src_end = &src[srclen];
4367   char* buf_end = &buf[buflen - 1];
4368 
4369   while (p < src_end && b < buf_end) {
4370     if (*p == '%') {
4371       switch (*(++p)) {
4372       case '%':         // "%%" ==> "%"
4373         *b++ = *p++;
4374         break;
4375       case 'p':  {       //  "%p" ==> current process id
4376         // buf_end points to the character before the last character so
4377         // that we could write '\0' to the end of the buffer.
4378         size_t buf_sz = buf_end - b + 1;
4379         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4380 
4381         // if jio_snprintf fails or the buffer is not long enough to hold
4382         // the expanded pid, returns false.
4383         if (ret < 0 || ret >= (int)buf_sz) {
4384           return false;
4385         } else {
4386           b += ret;
4387           assert(*b == '\0', "fail in copy_expand_pid");
4388           if (p == src_end && b == buf_end + 1) {
4389             // reach the end of the buffer.
4390             return true;
4391           }
4392         }
4393         p++;
4394         break;
4395       }
4396       default :
4397         *b++ = '%';
4398       }
4399     } else {
4400       *b++ = *p++;
4401     }
4402   }
4403   *b = '\0';
4404   return (p == src_end); // return false if not all of the source was copied
4405 }
--- EOF ---