       1 /*
       2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
       3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
       4  *
       5  * This code is free software; you can redistribute it and/or modify it
       6  * under the terms of the GNU General Public License version 2 only, as
       7  * published by the Free Software Foundation.
       8  *
       9  * This code is distributed in the hope that it will be useful, but WITHOUT
      10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      12  * version 2 for more details (a copy is included in the LICENSE file that
      13  * accompanied this code).
      14  *
      15  * You should have received a copy of the GNU General Public License version
      16  * 2 along with this work; if not, write to the Free Software Foundation,
      17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
      18  *
      19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
      20  * or visit www.oracle.com if you need additional information or have any
      21  * questions.
      22  *
      23  */
      24
      25 #include "precompiled.hpp"
      26 #include "classfile/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 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
      70 #define DEFAULT_JAVA_LAUNCHER  "generic"
      71
      72 // Disable options not supported in this release, with a warning if they
      73 // were explicitly requested on the command-line
      74 #define UNSUPPORTED_OPTION(opt, description)                    \
      75 do {                                                            \
      76   if (opt) {                                                    \
      77     if (FLAG_IS_CMDLINE(opt)) {                                 \
      78       warning(description " is disabled in this release.");     \
      79     }                                                           \
      80     FLAG_SET_DEFAULT(opt, false);                               \
      81   }                                                             \
      82 } while(0)
      83
      84 #define UNSUPPORTED_GC_OPTION(gc)                                     \
      85 do {                                                                  \
      86   if (gc) {                                                           \
      87     if (FLAG_IS_CMDLINE(gc)) {                                        \
      88       warning(#gc " is not supported in this VM.  Using Serial GC."); \
      89     }                                                                 \
      90     FLAG_SET_DEFAULT(gc, false);                                      \
      91   }                                                                   \
      92 } while(0)
      93
      94 char**  Arguments::_jvm_flags_array             = NULL;
      95 int     Arguments::_num_jvm_flags               = 0;
      96 char**  Arguments::_jvm_args_array              = NULL;
      97 int     Arguments::_num_jvm_args                = 0;
      98 char*  Arguments::_java_command                 = NULL;
      99 SystemProperty* Arguments::_system_properties   = NULL;
     100 const char*  Arguments::_gc_log_filename        = NULL;
     101 bool   Arguments::_has_profile                  = false;
     102 size_t Arguments::_conservative_max_heap_alignment = 0;
     103 uintx  Arguments::_min_heap_size                = 0;
     104 uintx  Arguments::_min_heap_free_ratio          = 0;
     105 uintx  Arguments::_max_heap_free_ratio          = 0;
     106 Arguments::Mode Arguments::_mode                = _mixed;
     107 bool   Arguments::_java_compiler                = false;
     108 bool   Arguments::_xdebug_mode                  = false;
     109 const char*  Arguments::_java_vendor_url_bug    = DEFAULT_VENDOR_URL_BUG;
     110 const char*  Arguments::_sun_java_launcher      = DEFAULT_JAVA_LAUNCHER;
     111 int    Arguments::_sun_java_launcher_pid        = -1;
     112 bool   Arguments::_created_by_gamma_launcher    = false;
     113
     114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
     115 bool   Arguments::_AlwaysCompileLoopMethods     = AlwaysCompileLoopMethods;
     116 bool   Arguments::_UseOnStackReplacement        = UseOnStackReplacement;
     117 bool   Arguments::_BackgroundCompilation        = BackgroundCompilation;
     118 bool   Arguments::_ClipInlining                 = ClipInlining;
     119
     120 char*  Arguments::SharedArchivePath             = NULL;
     121
     122 AgentLibraryList Arguments::_libraryList;
     123 AgentLibraryList Arguments::_agentList;
     124
     125 abort_hook_t     Arguments::_abort_hook         = NULL;
     126 exit_hook_t      Arguments::_exit_hook          = NULL;
     127 vfprintf_hook_t  Arguments::_vfprintf_hook      = NULL;
     128
     129
     130 SystemProperty *Arguments::_java_ext_dirs = NULL;
     131 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
     132 SystemProperty *Arguments::_sun_boot_library_path = NULL;
     133 SystemProperty *Arguments::_java_library_path = NULL;
     134 SystemProperty *Arguments::_java_home = NULL;
     135 SystemProperty *Arguments::_java_class_path = NULL;
     136 SystemProperty *Arguments::_sun_boot_class_path = NULL;
     137
     138 char* Arguments::_meta_index_path = NULL;
     139 char* Arguments::_meta_index_dir = NULL;
     140
     141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
     142
     143 static bool match_option(const JavaVMOption *option, const char* name,
     144                          const char** tail) {
     145   int len = (int)strlen(name);
     146   if (strncmp(option->optionString, name, len) == 0) {
     147     *tail = option->optionString + len;
     148     return true;
     149   } else {
     150     return false;
     151   }
     152 }
     153
     154 static void logOption(const char* opt) {
     155   if (PrintVMOptions) {
     156     jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
     157   }
     158 }
     159
     160 // Process java launcher properties.
     161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
     162   // See if sun.java.launcher or sun.java.launcher.pid is defined.
     163   // Must do this before setting up other system properties,
     164   // as some of them may depend on launcher type.
     165   for (int index = 0; index < args->nOptions; index++) {
     166     const JavaVMOption* option = args->options + index;
     167     const char* tail;
     168
     169     if (match_option(option, "-Dsun.java.launcher=", &tail)) {
     170       process_java_launcher_argument(tail, option->extraInfo);
     171       continue;
     172     }
     173     if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
     174       _sun_java_launcher_pid = atoi(tail);
     175       continue;
     176     }
     177   }
     178 }
     179
     180 // Initialize system properties key and value.
     181 void Arguments::init_system_properties() {
     182
     183   PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
     184                                                                  "Java Virtual Machine Specification",  false));
     185   PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(),  false));
     186   PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(),  false));
     187   PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(),  true));
     188
     189   // following are JVMTI agent writeable properties.
     190   // Properties values are set to NULL and they are
     191   // os specific they are initialized in os::init_system_properties_values().
     192   _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL,  true);
     193   _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL,  true);
     194   _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL,  true);
     195   _java_library_path = new SystemProperty("java.library.path", NULL,  true);
     196   _java_home =  new SystemProperty("java.home", NULL,  true);
     197   _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL,  true);
     198
     199   _java_class_path = new SystemProperty("java.class.path", "",  true);
     200
     201   // Add to System Property list.
     202   PropertyList_add(&_system_properties, _java_ext_dirs);
     203   PropertyList_add(&_system_properties, _java_endorsed_dirs);
     204   PropertyList_add(&_system_properties, _sun_boot_library_path);
     205   PropertyList_add(&_system_properties, _java_library_path);
     206   PropertyList_add(&_system_properties, _java_home);
     207   PropertyList_add(&_system_properties, _java_class_path);
     208   PropertyList_add(&_system_properties, _sun_boot_class_path);
     209
     210   // Set OS specific system properties values
     211   os::init_system_properties_values();
     212 }
     213
     214
     215   // Update/Initialize System properties after JDK version number is known
     216 void Arguments::init_version_specific_system_properties() {
     217   enum { bufsz = 16 };
     218   char buffer[bufsz];
     219   const char* spec_vendor = "Sun Microsystems Inc.";
     220   uint32_t spec_version = 0;
     221
     222   if (JDK_Version::is_gte_jdk17x_version()) {
     223     spec_vendor = "Oracle Corporation";
     224     spec_version = JDK_Version::current().major_version();
     225   }
     226   jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
     227
     228   PropertyList_add(&_system_properties,
     229       new SystemProperty("java.vm.specification.vendor",  spec_vendor, false));
     230   PropertyList_add(&_system_properties,
     231       new SystemProperty("java.vm.specification.version", buffer, false));
     232   PropertyList_add(&_system_properties,
     233       new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(),  false));
     234 }
     235
     236 /**
     237  * Provide a slightly more user-friendly way of eliminating -XX flags.
     238  * When a flag is eliminated, it can be added to this list in order to
     239  * continue accepting this flag on the command-line, while issuing a warning
     240  * and ignoring the value.  Once the JDK version reaches the 'accept_until'
     241  * limit, we flatly refuse to admit the existence of the flag.  This allows
     242  * a flag to die correctly over JDK releases using HSX.
     243  */
     244 typedef struct {
     245   const char* name;
     246   JDK_Version obsoleted_in; // when the flag went away
     247   JDK_Version accept_until; // which version to start denying the existence
     248 } ObsoleteFlag;
     249
     250 static ObsoleteFlag obsolete_jvm_flags[] = {
     251   { "UseTrainGC",                    JDK_Version::jdk(5), JDK_Version::jdk(7) },
     252   { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
     253   { "UseOversizedCarHandling",       JDK_Version::jdk(5), JDK_Version::jdk(7) },
     254   { "TraceCarAllocation",            JDK_Version::jdk(5), JDK_Version::jdk(7) },
     255   { "PrintTrainGCProcessingStats",   JDK_Version::jdk(5), JDK_Version::jdk(7) },
     256   { "LogOfCarSpaceSize",             JDK_Version::jdk(5), JDK_Version::jdk(7) },
     257   { "OversizedCarThreshold",         JDK_Version::jdk(5), JDK_Version::jdk(7) },
     258   { "MinTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
     259   { "DefaultTickInterval",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
     260   { "MaxTickInterval",               JDK_Version::jdk(5), JDK_Version::jdk(7) },
     261   { "DelayTickAdjustment",           JDK_Version::jdk(5), JDK_Version::jdk(7) },
     262   { "ProcessingToTenuringRatio",     JDK_Version::jdk(5), JDK_Version::jdk(7) },
     263   { "MinTrainLength",                JDK_Version::jdk(5), JDK_Version::jdk(7) },
     264   { "AppendRatio",         JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
     265   { "DefaultMaxRAM",       JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
     266   { "DefaultInitialRAMFraction",
     267                            JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
     268   { "UseDepthFirstScavengeOrder",
     269                            JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
     270   { "HandlePromotionFailure",
     271                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
     272   { "MaxLiveObjectEvacuationRatio",
     273                            JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
     274   { "ForceSharedSpaces",   JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
     275   { "UseParallelOldGCCompacting",
     276                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
     277   { "UseParallelDensePrefixUpdate",
     278                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
     279   { "UseParallelOldGCDensePrefix",
     280                            JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
     281   { "AllowTransitionalJSR292",       JDK_Version::jdk(7), JDK_Version::jdk(8) },
     282   { "UseCompressedStrings",          JDK_Version::jdk(7), JDK_Version::jdk(8) },
     283   { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     284   { "CMSTriggerPermRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     285   { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     286   { "AdaptivePermSizeWeight", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     287   { "PermGenPadding", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     288   { "PermMarkSweepDeadRatio", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     289   { "PermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     290   { "MaxPermSize", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     291   { "MinPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     292   { "MaxPermHeapExpansion", JDK_Version::jdk(8),  JDK_Version::jdk(9) },
     293   { "CMSRevisitStackSize",           JDK_Version::jdk(8), JDK_Version::jdk(9) },
     294   { "PrintRevisitStats",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
     295   { "UseVectoredExceptions",         JDK_Version::jdk(8), JDK_Version::jdk(9) },
     296   { "UseSplitVerifier",              JDK_Version::jdk(8), JDK_Version::jdk(9) },
     297   { "UseISM",                        JDK_Version::jdk(8), JDK_Version::jdk(9) },
     298   { "UsePermISM",                    JDK_Version::jdk(8), JDK_Version::jdk(9) },
     299   { "UseMPSS",                       JDK_Version::jdk(8), JDK_Version::jdk(9) },
     300   { "UseStringCache",                JDK_Version::jdk(8), JDK_Version::jdk(9) },
     301   { "UseOldInlining",                JDK_Version::jdk(9), JDK_Version::jdk(10) },
     302   { "AutoShutdownNMT",               JDK_Version::jdk(9), JDK_Version::jdk(10) },
     303   { "CompilationRepeat",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
     304 #ifdef PRODUCT
     305   { "DesiredMethodLimit",
     306                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
     307 #endif // PRODUCT
     308   { NULL, JDK_Version(0), JDK_Version(0) }
     309 };
     310
     311 // Returns true if the flag is obsolete and fits into the range specified
     312 // for being ignored.  In the case that the flag is ignored, the 'version'
     313 // value is filled in with the version number when the flag became
     314 // obsolete so that that value can be displayed to the user.
     315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
     316   int i = 0;
     317   assert(version != NULL, "Must provide a version buffer");
     318   while (obsolete_jvm_flags[i].name != NULL) {
     319     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
     320     // <flag>=xxx form
     321     // [-|+]<flag> form
     322     if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
     323         ((s[0] == '+' || s[0] == '-') &&
     324         (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
     325       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
     326           *version = flag_status.obsoleted_in;
     327           return true;
     328       }
     329     }
     330     i++;
     331   }
     332   return false;
     333 }
     334
     335 // Constructs the system class path (aka boot class path) from the following
     336 // components, in order:
     337 //
     338 //     prefix           // from -Xbootclasspath/p:...
     339 //     endorsed         // the expansion of -Djava.endorsed.dirs=...
     340 //     base             // from os::get_system_properties() or -Xbootclasspath=
     341 //     suffix           // from -Xbootclasspath/a:...
     342 //
     343 // java.endorsed.dirs is a list of directories; any jar or zip files in the
     344 // directories are added to the sysclasspath just before the base.
     345 //
     346 // This could be AllStatic, but it isn't needed after argument processing is
     347 // complete.
     348 class SysClassPath: public StackObj {
     349 public:
     350   SysClassPath(const char* base);
     351   ~SysClassPath();
     352
     353   inline void set_base(const char* base);
     354   inline void add_prefix(const char* prefix);
     355   inline void add_suffix_to_prefix(const char* suffix);
     356   inline void add_suffix(const char* suffix);
     357   inline void reset_path(const char* base);
     358
     359   // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
     360   // property.  Must be called after all command-line arguments have been
     361   // processed (in particular, -Djava.endorsed.dirs=...) and before calling
     362   // combined_path().
     363   void expand_endorsed();
     364
     365   inline const char* get_base()     const { return _items[_scp_base]; }
     366   inline const char* get_prefix()   const { return _items[_scp_prefix]; }
     367   inline const char* get_suffix()   const { return _items[_scp_suffix]; }
     368   inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
     369
     370   // Combine all the components into a single c-heap-allocated string; caller
     371   // must free the string if/when no longer needed.
     372   char* combined_path();
     373
     374 private:
     375   // Utility routines.
     376   static char* add_to_path(const char* path, const char* str, bool prepend);
     377   static char* add_jars_to_path(char* path, const char* directory);
     378
     379   inline void reset_item_at(int index);
     380
     381   // Array indices for the items that make up the sysclasspath.  All except the
     382   // base are allocated in the C heap and freed by this class.
     383   enum {
     384     _scp_prefix,        // from -Xbootclasspath/p:...
     385     _scp_endorsed,      // the expansion of -Djava.endorsed.dirs=...
     386     _scp_base,          // the default sysclasspath
     387     _scp_suffix,        // from -Xbootclasspath/a:...
     388     _scp_nitems         // the number of items, must be last.
     389   };
     390
     391   const char* _items[_scp_nitems];
     392   DEBUG_ONLY(bool _expansion_done;)
     393 };
     394
     395 SysClassPath::SysClassPath(const char* base) {
     396   memset(_items, 0, sizeof(_items));
     397   _items[_scp_base] = base;
     398   DEBUG_ONLY(_expansion_done = false;)
     399 }
     400
     401 SysClassPath::~SysClassPath() {
     402   // Free everything except the base.
     403   for (int i = 0; i < _scp_nitems; ++i) {
     404     if (i != _scp_base) reset_item_at(i);
     405   }
     406   DEBUG_ONLY(_expansion_done = false;)
     407 }
     408
     409 inline void SysClassPath::set_base(const char* base) {
     410   _items[_scp_base] = base;
     411 }
     412
     413 inline void SysClassPath::add_prefix(const char* prefix) {
     414   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
     415 }
     416
     417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
     418   _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
     419 }
     420
     421 inline void SysClassPath::add_suffix(const char* suffix) {
     422   _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
     423 }
     424
     425 inline void SysClassPath::reset_item_at(int index) {
     426   assert(index < _scp_nitems && index != _scp_base, "just checking");
     427   if (_items[index] != NULL) {
     428     FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
     429     _items[index] = NULL;
     430   }
     431 }
     432
     433 inline void SysClassPath::reset_path(const char* base) {
     434   // Clear the prefix and suffix.
     435   reset_item_at(_scp_prefix);
     436   reset_item_at(_scp_suffix);
     437   set_base(base);
     438 }
     439
     440 //------------------------------------------------------------------------------
     441
     442 void SysClassPath::expand_endorsed() {
     443   assert(_items[_scp_endorsed] == NULL, "can only be called once.");
     444
     445   const char* path = Arguments::get_property("java.endorsed.dirs");
     446   if (path == NULL) {
     447     path = Arguments::get_endorsed_dir();
     448     assert(path != NULL, "no default for java.endorsed.dirs");
     449   }
     450
     451   char* expanded_path = NULL;
     452   const char separator = *os::path_separator();
     453   const char* const end = path + strlen(path);
     454   while (path < end) {
     455     const char* tmp_end = strchr(path, separator);
     456     if (tmp_end == NULL) {
     457       expanded_path = add_jars_to_path(expanded_path, path);
     458       path = end;
     459     } else {
     460       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
     461       memcpy(dirpath, path, tmp_end - path);
     462       dirpath[tmp_end - path] = '\0';
     463       expanded_path = add_jars_to_path(expanded_path, dirpath);
     464       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
     465       path = tmp_end + 1;
     466     }
     467   }
     468   _items[_scp_endorsed] = expanded_path;
     469   DEBUG_ONLY(_expansion_done = true;)
     470 }
     471
     472 // Combine the bootclasspath elements, some of which may be null, into a single
     473 // c-heap-allocated string.
     474 char* SysClassPath::combined_path() {
     475   assert(_items[_scp_base] != NULL, "empty default sysclasspath");
     476   assert(_expansion_done, "must call expand_endorsed() first.");
     477
     478   size_t lengths[_scp_nitems];
     479   size_t total_len = 0;
     480
     481   const char separator = *os::path_separator();
     482
     483   // Get the lengths.
     484   int i;
     485   for (i = 0; i < _scp_nitems; ++i) {
     486     if (_items[i] != NULL) {
     487       lengths[i] = strlen(_items[i]);
     488       // Include space for the separator char (or a NULL for the last item).
     489       total_len += lengths[i] + 1;
     490     }
     491   }
     492   assert(total_len > 0, "empty sysclasspath not allowed");
     493
     494   // Copy the _items to a single string.
     495   char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
     496   char* cp_tmp = cp;
     497   for (i = 0; i < _scp_nitems; ++i) {
     498     if (_items[i] != NULL) {
     499       memcpy(cp_tmp, _items[i], lengths[i]);
     500       cp_tmp += lengths[i];
     501       *cp_tmp++ = separator;
     502     }
     503   }
     504   *--cp_tmp = '\0';     // Replace the extra separator.
     505   return cp;
     506 }
     507
     508 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
     509 char*
     510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
     511   char *cp;
     512
     513   assert(str != NULL, "just checking");
     514   if (path == NULL) {
     515     size_t len = strlen(str) + 1;
     516     cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
     517     memcpy(cp, str, len);                       // copy the trailing null
     518   } else {
     519     const char separator = *os::path_separator();
     520     size_t old_len = strlen(path);
     521     size_t str_len = strlen(str);
     522     size_t len = old_len + str_len + 2;
     523
     524     if (prepend) {
     525       cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
     526       char* cp_tmp = cp;
     527       memcpy(cp_tmp, str, str_len);
     528       cp_tmp += str_len;
     529       *cp_tmp = separator;
     530       memcpy(++cp_tmp, path, old_len + 1);      // copy the trailing null
     531       FREE_C_HEAP_ARRAY(char, path, mtInternal);
     532     } else {
     533       cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
     534       char* cp_tmp = cp + old_len;
     535       *cp_tmp = separator;
     536       memcpy(++cp_tmp, str, str_len + 1);       // copy the trailing null
     537     }
     538   }
     539   return cp;
     540 }
     541
     542 // Scan the directory and append any jar or zip files found to path.
     543 // Note:  path must be c-heap-allocated (or NULL); it is freed if non-null.
     544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
     545   DIR* dir = os::opendir(directory);
     546   if (dir == NULL) return path;
     547
     548   char dir_sep[2] = { '\0', '\0' };
     549   size_t directory_len = strlen(directory);
     550   const char fileSep = *os::file_separator();
     551   if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
     552
     553   /* Scan the directory for jars/zips, appending them to path. */
     554   struct dirent *entry;
     555   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
     556   while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
     557     const char* name = entry->d_name;
     558     const char* ext = name + strlen(name) - 4;
     559     bool isJarOrZip = ext > name &&
     560       (os::file_name_strcmp(ext, ".jar") == 0 ||
     561        os::file_name_strcmp(ext, ".zip") == 0);
     562     if (isJarOrZip) {
     563       char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
     564       sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
     565       path = add_to_path(path, jarpath, false);
     566       FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
     567     }
     568   }
     569   FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
     570   os::closedir(dir);
     571   return path;
     572 }
     573
     574 // Parses a memory size specification string.
     575 static bool atomull(const char *s, julong* result) {
     576   julong n = 0;
     577   int args_read = sscanf(s, JULONG_FORMAT, &n);
     578   if (args_read != 1) {
     579     return false;
     580   }
     581   while (*s != '\0' && isdigit(*s)) {
     582     s++;
     583   }
     584   // 4705540: illegal if more characters are found after the first non-digit
     585   if (strlen(s) > 1) {
     586     return false;
     587   }
     588   switch (*s) {
     589     case 'T': case 't':
     590       *result = n * G * K;
     591       // Check for overflow.
     592       if (*result/((julong)G * K) != n) return false;
     593       return true;
     594     case 'G': case 'g':
     595       *result = n * G;
     596       if (*result/G != n) return false;
     597       return true;
     598     case 'M': case 'm':
     599       *result = n * M;
     600       if (*result/M != n) return false;
     601       return true;
     602     case 'K': case 'k':
     603       *result = n * K;
     604       if (*result/K != n) return false;
     605       return true;
     606     case '\0':
     607       *result = n;
     608       return true;
     609     default:
     610       return false;
     611   }
     612 }
     613
     614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
     615   if (size < min_size) return arg_too_small;
     616   // Check that size will fit in a size_t (only relevant on 32-bit)
     617   if (size > max_uintx) return arg_too_big;
     618   return arg_in_range;
     619 }
     620
     621 // Describe an argument out of range error
     622 void Arguments::describe_range_error(ArgsRange errcode) {
     623   switch(errcode) {
     624   case arg_too_big:
     625     jio_fprintf(defaultStream::error_stream(),
     626                 "The specified size exceeds the maximum "
     627                 "representable size.\n");
     628     break;
     629   case arg_too_small:
     630   case arg_unreadable:
     631   case arg_in_range:
     632     // do nothing for now
     633     break;
     634   default:
     635     ShouldNotReachHere();
     636   }
     637 }
     638
     639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
     640   return CommandLineFlags::boolAtPut(name, &value, origin);
     641 }
     642
     643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
     644   double v;
     645   if (sscanf(value, "%lf", &v) != 1) {
     646     return false;
     647   }
     648
     649   if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
     650     return true;
     651   }
     652   return false;
     653 }
     654
     655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
     656   julong v;
     657   intx intx_v;
     658   bool is_neg = false;
     659   // Check the sign first since atomull() parses only unsigned values.
     660   if (*value == '-') {
     661     if (!CommandLineFlags::intxAt(name, &intx_v)) {
     662       return false;
     663     }
     664     value++;
     665     is_neg = true;
     666   }
     667   if (!atomull(value, &v)) {
     668     return false;
     669   }
     670   intx_v = (intx) v;
     671   if (is_neg) {
     672     intx_v = -intx_v;
     673   }
     674   if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
     675     return true;
     676   }
     677   uintx uintx_v = (uintx) v;
     678   if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
     679     return true;
     680   }
     681   uint64_t uint64_t_v = (uint64_t) v;
     682   if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
     683     return true;
     684   }
     685   return false;
     686 }
     687
     688 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
     689   if (!CommandLineFlags::ccstrAtPut(name, &value, origin))  return false;
     690   // Contract:  CommandLineFlags always returns a pointer that needs freeing.
     691   FREE_C_HEAP_ARRAY(char, value, mtInternal);
     692   return true;
     693 }
     694
     695 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
     696   const char* old_value = "";
     697   if (!CommandLineFlags::ccstrAt(name, &old_value))  return false;
     698   size_t old_len = old_value != NULL ? strlen(old_value) : 0;
     699   size_t new_len = strlen(new_value);
     700   const char* value;
     701   char* free_this_too = NULL;
     702   if (old_len == 0) {
     703     value = new_value;
     704   } else if (new_len == 0) {
     705     value = old_value;
     706   } else {
     707     char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
     708     // each new setting adds another LINE to the switch:
     709     sprintf(buf, "%s\n%s", old_value, new_value);
     710     value = buf;
     711     free_this_too = buf;
     712   }
     713   (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
     714   // CommandLineFlags always returns a pointer that needs freeing.
     715   FREE_C_HEAP_ARRAY(char, value, mtInternal);
     716   if (free_this_too != NULL) {
     717     // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
     718     FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
     719   }
     720   return true;
     721 }
     722
     723 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
     724
     725   // range of acceptable characters spelled out for portability reasons
     726 #define NAME_RANGE  "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
     727 #define BUFLEN 255
     728   char name[BUFLEN+1];
     729   char dummy;
     730
     731   if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
     732     return set_bool_flag(name, false, origin);
     733   }
     734   if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
     735     return set_bool_flag(name, true, origin);
     736   }
     737
     738   char punct;
     739   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
     740     const char* value = strchr(arg, '=') + 1;
     741     Flag* flag = Flag::find_flag(name, strlen(name));
     742     if (flag != NULL && flag->is_ccstr()) {
     743       if (flag->ccstr_accumulates()) {
     744         return append_to_string_flag(name, value, origin);
     745       } else {
     746         if (value[0] == '\0') {
     747           value = NULL;
     748         }
     749         return set_string_flag(name, value, origin);
     750       }
     751     }
     752   }
     753
     754   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
     755     const char* value = strchr(arg, '=') + 1;
     756     // -XX:Foo:=xxx will reset the string flag to the given value.
     757     if (value[0] == '\0') {
     758       value = NULL;
     759     }
     760     return set_string_flag(name, value, origin);
     761   }
     762
     763 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
     764 #define SIGNED_NUMBER_RANGE    "[-0123456789]"
     765 #define        NUMBER_RANGE    "[0123456789]"
     766   char value[BUFLEN + 1];
     767   char value2[BUFLEN + 1];
     768   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
     769     // Looks like a floating-point number -- try again with more lenient format string
     770     if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
     771       return set_fp_numeric_flag(name, value, origin);
     772     }
     773   }
     774
     775 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
     776   if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
     777     return set_numeric_flag(name, value, origin);
     778   }
     779
     780   return false;
     781 }
     782
     783 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
     784   assert(bldarray != NULL, "illegal argument");
     785
     786   if (arg == NULL) {
     787     return;
     788   }
     789
     790   int new_count = *count + 1;
     791
     792   // expand the array and add arg to the last element
     793   if (*bldarray == NULL) {
     794     *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
     795   } else {
     796     *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
     797   }
     798   (*bldarray)[*count] = strdup(arg);
     799   *count = new_count;
     800 }
     801
     802 void Arguments::build_jvm_args(const char* arg) {
     803   add_string(&_jvm_args_array, &_num_jvm_args, arg);
     804 }
     805
     806 void Arguments::build_jvm_flags(const char* arg) {
     807   add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
     808 }
     809
     810 // utility function to return a string that concatenates all
     811 // strings in a given char** array
     812 const char* Arguments::build_resource_string(char** args, int count) {
     813   if (args == NULL || count == 0) {
     814     return NULL;
     815   }
     816   size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
     817   for (int i = 1; i < count; i++) {
     818     length += strlen(args[i]) + 1; // add 1 for a space
     819   }
     820   char* s = NEW_RESOURCE_ARRAY(char, length);
     821   strcpy(s, args[0]);
     822   for (int j = 1; j < count; j++) {
     823     strcat(s, " ");
     824     strcat(s, args[j]);
     825   }
     826   return (const char*) s;
     827 }
     828
     829 void Arguments::print_on(outputStream* st) {
     830   st->print_cr("VM Arguments:");
     831   if (num_jvm_flags() > 0) {
     832     st->print("jvm_flags: "); print_jvm_flags_on(st);
     833   }
     834   if (num_jvm_args() > 0) {
     835     st->print("jvm_args: "); print_jvm_args_on(st);
     836   }
     837   st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
     838   if (_java_class_path != NULL) {
     839     char* path = _java_class_path->value();
     840     st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
     841   }
     842   st->print_cr("Launcher Type: %s", _sun_java_launcher);
     843 }
     844
     845 void Arguments::print_jvm_flags_on(outputStream* st) {
     846   if (_num_jvm_flags > 0) {
     847     for (int i=0; i < _num_jvm_flags; i++) {
     848       st->print("%s ", _jvm_flags_array[i]);
     849     }
     850     st->cr();
     851   }
     852 }
     853
     854 void Arguments::print_jvm_args_on(outputStream* st) {
     855   if (_num_jvm_args > 0) {
     856     for (int i=0; i < _num_jvm_args; i++) {
     857       st->print("%s ", _jvm_args_array[i]);
     858     }
     859     st->cr();
     860   }
     861 }
     862
     863 bool Arguments::process_argument(const char* arg,
     864     jboolean ignore_unrecognized, Flag::Flags origin) {
     865
     866   JDK_Version since = JDK_Version();
     867
     868   if (parse_argument(arg, origin) || ignore_unrecognized) {
     869     return true;
     870   }
     871
     872   bool has_plus_minus = (*arg == '+' || *arg == '-');
     873   const char* const argname = has_plus_minus ? arg + 1 : arg;
     874   if (is_newly_obsolete(arg, &since)) {
     875     char version[256];
     876     since.to_string(version, sizeof(version));
     877     warning("ignoring option %s; support was removed in %s", argname, version);
     878     return true;
     879   }
     880
     881   // For locked flags, report a custom error message if available.
     882   // Otherwise, report the standard unrecognized VM option.
     883
     884   size_t arg_len;
     885   const char* equal_sign = strchr(argname, '=');
     886   if (equal_sign == NULL) {
     887     arg_len = strlen(argname);
     888   } else {
     889     arg_len = equal_sign - argname;
     890   }
     891
     892   Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
     893   if (found_flag != NULL) {
     894     char locked_message_buf[BUFLEN];
     895     found_flag->get_locked_message(locked_message_buf, BUFLEN);
     896     if (strlen(locked_message_buf) == 0) {
     897       if (found_flag->is_bool() && !has_plus_minus) {
     898         jio_fprintf(defaultStream::error_stream(),
     899           "Missing +/- setting for VM option '%s'\n", argname);
     900       } else if (!found_flag->is_bool() && has_plus_minus) {
     901         jio_fprintf(defaultStream::error_stream(),
     902           "Unexpected +/- setting in VM option '%s'\n", argname);
     903       } else {
     904         jio_fprintf(defaultStream::error_stream(),
     905           "Improperly specified VM option '%s'\n", argname);
     906       }
     907     } else {
     908       jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
     909     }
     910   } else {
     911     jio_fprintf(defaultStream::error_stream(),
     912                 "Unrecognized VM option '%s'\n", argname);
     913     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
     914     if (fuzzy_matched != NULL) {
     915       jio_fprintf(defaultStream::error_stream(),
     916                   "Did you mean '%s%s%s'?\n",
     917                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
     918                   fuzzy_matched->_name,
     919                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
     920     }
     921   }
     922
     923   // allow for commandline "commenting out" options like -XX:#+Verbose
     924   return arg[0] == '#';
     925 }
     926
     927 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
     928   FILE* stream = fopen(file_name, "rb");
     929   if (stream == NULL) {
     930     if (should_exist) {
     931       jio_fprintf(defaultStream::error_stream(),
     932                   "Could not open settings file %s\n", file_name);
     933       return false;
     934     } else {
     935       return true;
     936     }
     937   }
     938
     939   char token[1024];
     940   int  pos = 0;
     941
     942   bool in_white_space = true;
     943   bool in_comment     = false;
     944   bool in_quote       = false;
     945   char quote_c        = 0;
     946   bool result         = true;
     947
     948   int c = getc(stream);
     949   while(c != EOF && pos < (int)(sizeof(token)-1)) {
     950     if (in_white_space) {
     951       if (in_comment) {
     952         if (c == '\n') in_comment = false;
     953       } else {
     954         if (c == '#') in_comment = true;
     955         else if (!isspace(c)) {
     956           in_white_space = false;
     957           token[pos++] = c;
     958         }
     959       }
     960     } else {
     961       if (c == '\n' || (!in_quote && isspace(c))) {
     962         // token ends at newline, or at unquoted whitespace
     963         // this allows a way to include spaces in string-valued options
     964         token[pos] = '\0';
     965         logOption(token);
     966         result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
     967         build_jvm_flags(token);
     968         pos = 0;
     969         in_white_space = true;
     970         in_quote = false;
     971       } else if (!in_quote && (c == '\'' || c == '"')) {
     972         in_quote = true;
     973         quote_c = c;
     974       } else if (in_quote && (c == quote_c)) {
     975         in_quote = false;
     976       } else {
     977         token[pos++] = c;
     978       }
     979     }
     980     c = getc(stream);
     981   }
     982   if (pos > 0) {
     983     token[pos] = '\0';
     984     result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
     985     build_jvm_flags(token);
     986   }
     987   fclose(stream);
     988   return result;
     989 }
     990
     991 //=============================================================================================================
     992 // Parsing of properties (-D)
     993
     994 const char* Arguments::get_property(const char* key) {
     995   return PropertyList_get_value(system_properties(), key);
     996 }
     997
     998 bool Arguments::add_property(const char* prop) {
     999   const char* eq = strchr(prop, '=');
    1000   char* key;
    1001   // ns must be static--its address may be stored in a SystemProperty object.
    1002   const static char ns[1] = {0};
    1003   char* value = (char *)ns;
    1004
    1005   size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
    1006   key = AllocateHeap(key_len + 1, mtInternal);
    1007   strncpy(key, prop, key_len);
    1008   key[key_len] = '\0';
    1009
    1010   if (eq != NULL) {
    1011     size_t value_len = strlen(prop) - key_len - 1;
    1012     value = AllocateHeap(value_len + 1, mtInternal);
    1013     strncpy(value, &prop[key_len + 1], value_len + 1);
    1014   }
    1015
    1016   if (strcmp(key, "java.compiler") == 0) {
    1017     process_java_compiler_argument(value);
    1018     FreeHeap(key);
    1019     if (eq != NULL) {
    1020       FreeHeap(value);
    1021     }
    1022     return true;
    1023   } else if (strcmp(key, "sun.java.command") == 0) {
    1024     _java_command = value;
    1025
    1026     // Record value in Arguments, but let it get passed to Java.
    1027   } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
    1028     // launcher.pid property is private and is processed
    1029     // in process_sun_java_launcher_properties();
    1030     // the sun.java.launcher property is passed on to the java application
    1031     FreeHeap(key);
    1032     if (eq != NULL) {
    1033       FreeHeap(value);
    1034     }
    1035     return true;
    1036   } else if (strcmp(key, "java.vendor.url.bug") == 0) {
    1037     // save it in _java_vendor_url_bug, so JVM fatal error handler can access
    1038     // its value without going through the property list or making a Java call.
    1039     _java_vendor_url_bug = value;
    1040   } else if (strcmp(key, "sun.boot.library.path") == 0) {
    1041     PropertyList_unique_add(&_system_properties, key, value, true);
    1042     return true;
    1043   }
    1044   // Create new property and add at the end of the list
    1045   PropertyList_unique_add(&_system_properties, key, value);
    1046   return true;
    1047 }
    1048
    1049 //===========================================================================================================
    1050 // Setting int/mixed/comp mode flags
    1051
    1052 void Arguments::set_mode_flags(Mode mode) {
    1053   // Set up default values for all flags.
    1054   // If you add a flag to any of the branches below,
    1055   // add a default value for it here.
    1056   set_java_compiler(false);
    1057   _mode                      = mode;
    1058
    1059   // Ensure Agent_OnLoad has the correct initial values.
    1060   // This may not be the final mode; mode may change later in onload phase.
    1061   PropertyList_unique_add(&_system_properties, "java.vm.info",
    1062                           (char*)VM_Version::vm_info_string(), false);
    1063
    1064   UseInterpreter             = true;
    1065   UseCompiler                = true;
    1066   UseLoopCounter             = true;
    1067
    1068 #ifndef ZERO
    1069   // Turn these off for mixed and comp.  Leave them on for Zero.
    1070   if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
    1071     UseFastAccessorMethods = (mode == _int);
    1072   }
    1073   if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
    1074     UseFastEmptyMethods = (mode == _int);
    1075   }
    1076 #endif
    1077
    1078   // Default values may be platform/compiler dependent -
    1079   // use the saved values
    1080   ClipInlining               = Arguments::_ClipInlining;
    1081   AlwaysCompileLoopMethods   = Arguments::_AlwaysCompileLoopMethods;
    1082   UseOnStackReplacement      = Arguments::_UseOnStackReplacement;
    1083   BackgroundCompilation      = Arguments::_BackgroundCompilation;
    1084
    1085   // Change from defaults based on mode
    1086   switch (mode) {
    1087   default:
    1088     ShouldNotReachHere();
    1089     break;
    1090   case _int:
    1091     UseCompiler              = false;
    1092     UseLoopCounter           = false;
    1093     AlwaysCompileLoopMethods = false;
    1094     UseOnStackReplacement    = false;
    1095     break;
    1096   case _mixed:
    1097     // same as default
    1098     break;
    1099   case _comp:
    1100     UseInterpreter           = false;
    1101     BackgroundCompilation    = false;
    1102     ClipInlining             = false;
    1103     // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
    1104     // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
    1105     // compile a level 4 (C2) and then continue executing it.
    1106     if (TieredCompilation) {
    1107       Tier3InvokeNotifyFreqLog = 0;
    1108       Tier4InvocationThreshold = 0;
    1109     }
    1110     break;
    1111   }
    1112 }
    1113
    1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
    1115 // Conflict: required to use shared spaces (-Xshare:on), but
    1116 // incompatible command line options were chosen.
    1117
    1118 static void no_shared_spaces(const char* message) {
    1119   if (RequireSharedSpaces) {
    1120     jio_fprintf(defaultStream::error_stream(),
    1121       "Class data sharing is inconsistent with other specified options.\n");
    1122     vm_exit_during_initialization("Unable to use shared archive.", message);
    1123   } else {
    1124     FLAG_SET_DEFAULT(UseSharedSpaces, false);
    1125   }
    1126 }
    1127 #endif
    1128
    1129 void Arguments::set_tiered_flags() {
    1130   // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
    1131   if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
    1132     FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
    1133   }
    1134   if (CompilationPolicyChoice < 2) {
    1135     vm_exit_during_initialization(
    1136       "Incompatible compilation policy selected", NULL);
    1137   }
    1138   // Increase the code cache size - tiered compiles a lot more.
    1139   if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
    1140     FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
    1141   }
    1142   if (!UseInterpreter) { // -Xcomp
    1143     Tier3InvokeNotifyFreqLog = 0;
    1144     Tier4InvocationThreshold = 0;
    1145   }
    1146 }
    1147
    1148 /**
    1149  * Returns the minimum number of compiler threads needed to run the JVM. The following
    1150  * configurations are possible.
    1151  *
    1152  * 1) The JVM is build using an interpreter only. As a result, the minimum number of
    1153  *    compiler threads is 0.
    1154  * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
    1155  *    a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
    1156  * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
    1157  *    the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
    1158  *    C1 can be used, so the minimum number of compiler threads is 1.
    1159  * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
    1160  *    'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
    1161  *    the minimum number of compiler threads is 2.
    1162  */
    1163 int Arguments::get_min_number_of_compiler_threads() {
    1164 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
    1165   return 0;   // case 1
    1166 #else
    1167   if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
    1168     return 1; // case 2 or case 3
    1169   }
    1170   return 2;   // case 4 (tiered)
    1171 #endif
    1172 }
    1173
    1174 #if INCLUDE_ALL_GCS
    1175 static void disable_adaptive_size_policy(const char* collector_name) {
    1176   if (UseAdaptiveSizePolicy) {
    1177     if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
    1178       warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
    1179               collector_name);
    1180     }
    1181     FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
    1182   }
    1183 }
    1184
    1185 void Arguments::set_parnew_gc_flags() {
    1186   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
    1187          "control point invariant");
    1188   assert(UseParNewGC, "Error");
    1189
    1190   // Turn off AdaptiveSizePolicy for parnew until it is complete.
    1191   disable_adaptive_size_policy("UseParNewGC");
    1192
    1193   if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
    1194     FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
    1195     assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
    1196   } else if (ParallelGCThreads == 0) {
    1197     jio_fprintf(defaultStream::error_stream(),
    1198         "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
    1199     vm_exit(1);
    1200   }
    1201
    1202   // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
    1203   // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
    1204   // we set them to 1024 and 1024.
    1205   // See CR 6362902.
    1206   if (FLAG_IS_DEFAULT(YoungPLABSize)) {
    1207     FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
    1208   }
    1209   if (FLAG_IS_DEFAULT(OldPLABSize)) {
    1210     FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
    1211   }
    1212
    1213   // AlwaysTenure flag should make ParNew promote all at first collection.
    1214   // See CR 6362902.
    1215   if (AlwaysTenure) {
    1216     FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
    1217   }
    1218   // When using compressed oops, we use local overflow stacks,
    1219   // rather than using a global overflow list chained through
    1220   // the klass word of the object's pre-image.
    1221   if (UseCompressedOops && !ParGCUseLocalOverflow) {
    1222     if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
    1223       warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
    1224     }
    1225     FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
    1226   }
    1227   assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
    1228 }
    1229
    1230 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
    1231 // sparc/solaris for certain applications, but would gain from
    1232 // further optimization and tuning efforts, and would almost
    1233 // certainly gain from analysis of platform and environment.
    1234 void Arguments::set_cms_and_parnew_gc_flags() {
    1235   assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
    1236   assert(UseConcMarkSweepGC, "CMS is expected to be on here");
    1237
    1238   // If we are using CMS, we prefer to UseParNewGC,
    1239   // unless explicitly forbidden.
    1240   if (FLAG_IS_DEFAULT(UseParNewGC)) {
    1241     FLAG_SET_ERGO(bool, UseParNewGC, true);
    1242   }
    1243
    1244   // Turn off AdaptiveSizePolicy by default for cms until it is complete.
    1245   disable_adaptive_size_policy("UseConcMarkSweepGC");
    1246
    1247   // In either case, adjust ParallelGCThreads and/or UseParNewGC
    1248   // as needed.
    1249   if (UseParNewGC) {
    1250     set_parnew_gc_flags();
    1251   }
    1252
    1253   size_t max_heap = align_size_down(MaxHeapSize,
    1254                                     CardTableRS::ct_max_alignment_constraint());
    1255
    1256   // Now make adjustments for CMS
    1257   intx   tenuring_default = (intx)6;
    1258   size_t young_gen_per_worker = CMSYoungGenPerWorker;
    1259
    1260   // Preferred young gen size for "short" pauses:
    1261   // upper bound depends on # of threads and NewRatio.
    1262   const uintx parallel_gc_threads =
    1263     (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
    1264   const size_t preferred_max_new_size_unaligned =
    1265     MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
    1266   size_t preferred_max_new_size =
    1267     align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
    1268
    1269   // Unless explicitly requested otherwise, size young gen
    1270   // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
    1271
    1272   // If either MaxNewSize or NewRatio is set on the command line,
    1273   // assume the user is trying to set the size of the young gen.
    1274   if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
    1275
    1276     // Set MaxNewSize to our calculated preferred_max_new_size unless
    1277     // NewSize was set on the command line and it is larger than
    1278     // preferred_max_new_size.
    1279     if (!FLAG_IS_DEFAULT(NewSize)) {   // NewSize explicitly set at command-line
    1280       FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
    1281     } else {
    1282       FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
    1283     }
    1284     if (PrintGCDetails && Verbose) {
    1285       // Too early to use gclog_or_tty
    1286       tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
    1287     }
    1288
    1289     // Code along this path potentially sets NewSize and OldSize
    1290     if (PrintGCDetails && Verbose) {
    1291       // Too early to use gclog_or_tty
    1292       tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
    1293            " initial_heap_size:  " SIZE_FORMAT
    1294            " max_heap: " SIZE_FORMAT,
    1295            min_heap_size(), InitialHeapSize, max_heap);
    1296     }
    1297     size_t min_new = preferred_max_new_size;
    1298     if (FLAG_IS_CMDLINE(NewSize)) {
    1299       min_new = NewSize;
    1300     }
    1301     if (max_heap > min_new && min_heap_size() > min_new) {
    1302       // Unless explicitly requested otherwise, make young gen
    1303       // at least min_new, and at most preferred_max_new_size.
    1304       if (FLAG_IS_DEFAULT(NewSize)) {
    1305         FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
    1306         FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
    1307         if (PrintGCDetails && Verbose) {
    1308           // Too early to use gclog_or_tty
    1309           tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
    1310         }
    1311       }
    1312       // Unless explicitly requested otherwise, size old gen
    1313       // so it's NewRatio x of NewSize.
    1314       if (FLAG_IS_DEFAULT(OldSize)) {
    1315         if (max_heap > NewSize) {
    1316           FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
    1317           if (PrintGCDetails && Verbose) {
    1318             // Too early to use gclog_or_tty
    1319             tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
    1320           }
    1321         }
    1322       }
    1323     }
    1324   }
    1325   // Unless explicitly requested otherwise, definitely
    1326   // promote all objects surviving "tenuring_default" scavenges.
    1327   if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
    1328       FLAG_IS_DEFAULT(SurvivorRatio)) {
    1329     FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
    1330   }
    1331   // If we decided above (or user explicitly requested)
    1332   // `promote all' (via MaxTenuringThreshold := 0),
    1333   // prefer minuscule survivor spaces so as not to waste
    1334   // space for (non-existent) survivors
    1335   if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
    1336     FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
    1337   }
    1338   // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
    1339   // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
    1340   // This is done in order to make ParNew+CMS configuration to work
    1341   // with YoungPLABSize and OldPLABSize options.
    1342   // See CR 6362902.
    1343   if (!FLAG_IS_DEFAULT(OldPLABSize)) {
    1344     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
    1345       // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
    1346       // is.  In this situtation let CMSParPromoteBlocksToClaim follow
    1347       // the value (either from the command line or ergonomics) of
    1348       // OldPLABSize.  Following OldPLABSize is an ergonomics decision.
    1349       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
    1350     } else {
    1351       // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
    1352       // CMSParPromoteBlocksToClaim is a collector-specific flag, so
    1353       // we'll let it to take precedence.
    1354       jio_fprintf(defaultStream::error_stream(),
    1355                   "Both OldPLABSize and CMSParPromoteBlocksToClaim"
    1356                   " options are specified for the CMS collector."
    1357                   " CMSParPromoteBlocksToClaim will take precedence.\n");
    1358     }
    1359   }
    1360   if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
    1361     // OldPLAB sizing manually turned off: Use a larger default setting,
    1362     // unless it was manually specified. This is because a too-low value
    1363     // will slow down scavenges.
    1364     if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
    1365       FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
    1366     }
    1367   }
    1368   // Overwrite OldPLABSize which is the variable we will internally use everywhere.
    1369   FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
    1370   // If either of the static initialization defaults have changed, note this
    1371   // modification.
    1372   if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
    1373     CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
    1374   }
    1375   if (PrintGCDetails && Verbose) {
    1376     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
    1377       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
    1378     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
    1379   }
    1380 }
    1381 #endif // INCLUDE_ALL_GCS
    1382
    1383 void set_object_alignment() {
    1384   // Object alignment.
    1385   assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
    1386   MinObjAlignmentInBytes     = ObjectAlignmentInBytes;
    1387   assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
    1388   MinObjAlignment            = MinObjAlignmentInBytes / HeapWordSize;
    1389   assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
    1390   MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
    1391
    1392   LogMinObjAlignmentInBytes  = exact_log2(ObjectAlignmentInBytes);
    1393   LogMinObjAlignment         = LogMinObjAlignmentInBytes - LogHeapWordSize;
    1394
    1395   // Oop encoding heap max
    1396   OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
    1397
    1398 #if INCLUDE_ALL_GCS
    1399   // Set CMS global values
    1400   CompactibleFreeListSpace::set_cms_values();
    1401 #endif // INCLUDE_ALL_GCS
    1402 }
    1403
    1404 bool verify_object_alignment() {
    1405   // Object alignment.
    1406   if (!is_power_of_2(ObjectAlignmentInBytes)) {
    1407     jio_fprintf(defaultStream::error_stream(),
    1408                 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
    1409                 (int)ObjectAlignmentInBytes);
    1410     return false;
    1411   }
    1412   if ((int)ObjectAlignmentInBytes < BytesPerLong) {
    1413     jio_fprintf(defaultStream::error_stream(),
    1414                 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
    1415                 (int)ObjectAlignmentInBytes, BytesPerLong);
    1416     return false;
    1417   }
    1418   // It does not make sense to have big object alignment
    1419   // since a space lost due to alignment will be greater
    1420   // then a saved space from compressed oops.
    1421   if ((int)ObjectAlignmentInBytes > 256) {
    1422     jio_fprintf(defaultStream::error_stream(),
    1423                 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
    1424                 (int)ObjectAlignmentInBytes);
    1425     return false;
    1426   }
    1427   // In case page size is very small.
    1428   if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
    1429     jio_fprintf(defaultStream::error_stream(),
    1430                 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
    1431                 (int)ObjectAlignmentInBytes, os::vm_page_size());
    1432     return false;
    1433   }
    1434   if(SurvivorAlignmentInBytes == 0) {
    1435     SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
    1436   } else {
    1437     if (!is_power_of_2(SurvivorAlignmentInBytes)) {
    1438       jio_fprintf(defaultStream::error_stream(),
    1439             "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
    1440             (int)SurvivorAlignmentInBytes);
    1441       return false;
    1442     }
    1443     if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
    1444       jio_fprintf(defaultStream::error_stream(),
    1445           "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
    1446           (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
    1447       return false;
    1448     }
    1449   }
    1450   return true;
    1451 }
    1452
    1453 size_t Arguments::max_heap_for_compressed_oops() {
    1454   // Avoid sign flip.
    1455   assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
    1456   // We need to fit both the NULL page and the heap into the memory budget, while
    1457   // keeping alignment constraints of the heap. To guarantee the latter, as the
    1458   // NULL page is located before the heap, we pad the NULL page to the conservative
    1459   // maximum alignment that the GC may ever impose upon the heap.
    1460   size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
    1461                                                         _conservative_max_heap_alignment);
    1462
    1463   LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
    1464   NOT_LP64(ShouldNotReachHere(); return 0);
    1465 }
    1466
    1467 bool Arguments::should_auto_select_low_pause_collector() {
    1468   if (UseAutoGCSelectPolicy &&
    1469       !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
    1470       (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
    1471     if (PrintGCDetails) {
    1472       // Cannot use gclog_or_tty yet.
    1473       tty->print_cr("Automatic selection of the low pause collector"
    1474        " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
    1475     }
    1476     return true;
    1477   }
    1478   return false;
    1479 }
    1480
    1481 void Arguments::set_use_compressed_oops() {
    1482 #ifndef ZERO
    1483 #ifdef _LP64
    1484   // MaxHeapSize is not set up properly at this point, but
    1485   // the only value that can override MaxHeapSize if we are
    1486   // to use UseCompressedOops is InitialHeapSize.
    1487   size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
    1488
    1489   if (max_heap_size <= max_heap_for_compressed_oops()) {
    1490 #if !defined(COMPILER1) || defined(TIERED)
    1491     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
    1492       FLAG_SET_ERGO(bool, UseCompressedOops, true);
    1493     }
    1494 #endif
    1495 #ifdef _WIN64
    1496     if (UseLargePages && UseCompressedOops) {
    1497       // Cannot allocate guard pages for implicit checks in indexed addressing
    1498       // mode, when large pages are specified on windows.
    1499       // This flag could be switched ON if narrow oop base address is set to 0,
    1500       // see code in Universe::initialize_heap().
    1501       Universe::set_narrow_oop_use_implicit_null_checks(false);
    1502     }
    1503 #endif //  _WIN64
    1504   } else {
    1505     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
    1506       warning("Max heap size too large for Compressed Oops");
    1507       FLAG_SET_DEFAULT(UseCompressedOops, false);
    1508       FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
    1509     }
    1510   }
    1511 #endif // _LP64
    1512 #endif // ZERO
    1513 }
    1514
    1515
    1516 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
    1517 // set_use_compressed_oops().
    1518 void Arguments::set_use_compressed_klass_ptrs() {
    1519 #ifndef ZERO
    1520 #ifdef _LP64
    1521   // UseCompressedOops must be on for UseCompressedClassPointers to be on.
    1522   if (!UseCompressedOops) {
    1523     if (UseCompressedClassPointers) {
    1524       warning("UseCompressedClassPointers requires UseCompressedOops");
    1525     }
    1526     FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
    1527   } else {
    1528     // Turn on UseCompressedClassPointers too
    1529     if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
    1530       FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
    1531     }
    1532     // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
    1533     if (UseCompressedClassPointers) {
    1534       if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
    1535         warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
    1536         FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
    1537       }
    1538     }
    1539   }
    1540 #endif // _LP64
    1541 #endif // !ZERO
    1542 }
    1543
    1544 void Arguments::set_conservative_max_heap_alignment() {
    1545   // The conservative maximum required alignment for the heap is the maximum of
    1546   // the alignments imposed by several sources: any requirements from the heap
    1547   // itself, the collector policy and the maximum page size we may run the VM
    1548   // with.
    1549   size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
    1550 #if INCLUDE_ALL_GCS
    1551   if (UseParallelGC) {
    1552     heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
    1553   } else if (UseG1GC) {
    1554     heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
    1555   }
    1556 #endif // INCLUDE_ALL_GCS
    1557   _conservative_max_heap_alignment = MAX4(heap_alignment,
    1558                                           (size_t)os::vm_allocation_granularity(),
    1559                                           os::max_page_size(),
    1560                                           CollectorPolicy::compute_heap_alignment());
    1561 }
    1562
    1563 void Arguments::select_gc_ergonomically() {
    1564   if (os::is_server_class_machine()) {
    1565     if (should_auto_select_low_pause_collector()) {
    1566       FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
    1567     } else {
    1568       FLAG_SET_ERGO(bool, UseParallelGC, true);
    1569     }
    1570   }
    1571 }
    1572
    1573 void Arguments::select_gc() {
    1574   if (!gc_selected()) {
    1575     ArgumentsExt::select_gc_ergonomically();
    1576   }
    1577 }
    1578
    1579 void Arguments::set_ergonomics_flags() {
    1580   select_gc();
    1581
    1582 #ifdef COMPILER2
    1583   // Shared spaces work fine with other GCs but causes bytecode rewriting
    1584   // to be disabled, which hurts interpreter performance and decreases
    1585   // server performance.  When -server is specified, keep the default off
    1586   // unless it is asked for.  Future work: either add bytecode rewriting
    1587   // at link time, or rewrite bytecodes in non-shared methods.
    1588   if (!DumpSharedSpaces && !RequireSharedSpaces &&
    1589       (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
    1590     no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
    1591   }
    1592 #endif
    1593
    1594   set_conservative_max_heap_alignment();
    1595
    1596 #ifndef ZERO
    1597 #ifdef _LP64
    1598   set_use_compressed_oops();
    1599
    1600   // set_use_compressed_klass_ptrs() must be called after calling
    1601   // set_use_compressed_oops().
    1602   set_use_compressed_klass_ptrs();
    1603
    1604   // Also checks that certain machines are slower with compressed oops
    1605   // in vm_version initialization code.
    1606 #endif // _LP64
    1607 #endif // !ZERO
    1608 }
    1609
    1610 void Arguments::set_parallel_gc_flags() {
    1611   assert(UseParallelGC || UseParallelOldGC, "Error");
    1612   // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
    1613   if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
    1614     FLAG_SET_DEFAULT(UseParallelOldGC, true);
    1615   }
    1616   FLAG_SET_DEFAULT(UseParallelGC, true);
    1617
    1618   // If no heap maximum was requested explicitly, use some reasonable fraction
    1619   // of the physical memory, up to a maximum of 1GB.
    1620   FLAG_SET_DEFAULT(ParallelGCThreads,
    1621                    Abstract_VM_Version::parallel_worker_threads());
    1622   if (ParallelGCThreads == 0) {
    1623     jio_fprintf(defaultStream::error_stream(),
    1624         "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
    1625     vm_exit(1);
    1626   }
    1627
    1628   if (UseAdaptiveSizePolicy) {
    1629     // We don't want to limit adaptive heap sizing's freedom to adjust the heap
    1630     // unless the user actually sets these flags.
    1631     if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
    1632       FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
    1633       _min_heap_free_ratio = MinHeapFreeRatio;
    1634     }
    1635     if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
    1636       FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
    1637       _max_heap_free_ratio = MaxHeapFreeRatio;
    1638     }
    1639   }
    1640
    1641   // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
    1642   // SurvivorRatio has been set, reset their default values to SurvivorRatio +
    1643   // 2.  By doing this we make SurvivorRatio also work for Parallel Scavenger.
    1644   // See CR 6362902 for details.
    1645   if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
    1646     if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
    1647        FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
    1648     }
    1649     if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
    1650       FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
    1651     }
    1652   }
    1653
    1654   if (UseParallelOldGC) {
    1655     // Par compact uses lower default values since they are treated as
    1656     // minimums.  These are different defaults because of the different
    1657     // interpretation and are not ergonomically set.
    1658     if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
    1659       FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
    1660     }
    1661   }
    1662 }
    1663
    1664 void Arguments::set_g1_gc_flags() {
    1665   assert(UseG1GC, "Error");
    1666 #ifdef COMPILER1
    1667   FastTLABRefill = false;
    1668 #endif
    1669   FLAG_SET_DEFAULT(ParallelGCThreads,
    1670                      Abstract_VM_Version::parallel_worker_threads());
    1671   if (ParallelGCThreads == 0) {
    1672     FLAG_SET_DEFAULT(ParallelGCThreads,
    1673                      Abstract_VM_Version::parallel_worker_threads());
    1674   }
    1675
    1676 #if INCLUDE_ALL_GCS
    1677   if (G1ConcRefinementThreads == 0) {
    1678     FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
    1679   }
    1680 #endif
    1681
    1682   // MarkStackSize will be set (if it hasn't been set by the user)
    1683   // when concurrent marking is initialized.
    1684   // Its value will be based upon the number of parallel marking threads.
    1685   // But we do set the maximum mark stack size here.
    1686   if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
    1687     FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
    1688   }
    1689
    1690   if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
    1691     // In G1, we want the default GC overhead goal to be higher than
    1692     // say in PS. So we set it here to 10%. Otherwise the heap might
    1693     // be expanded more aggressively than we would like it to. In
    1694     // fact, even 10% seems to not be high enough in some cases
    1695     // (especially small GC stress tests that the main thing they do
    1696     // is allocation). We might consider increase it further.
    1697     FLAG_SET_DEFAULT(GCTimeRatio, 9);
    1698   }
    1699
    1700   if (PrintGCDetails && Verbose) {
    1701     tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
    1702       (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
    1703     tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
    1704   }
    1705 }
    1706
    1707 #if !INCLUDE_ALL_GCS
    1708 #ifdef ASSERT
    1709 static bool verify_serial_gc_flags() {
    1710   return (UseSerialGC &&
    1711         !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
    1712           UseParallelGC || UseParallelOldGC));
    1713 }
    1714 #endif // ASSERT
    1715 #endif // INCLUDE_ALL_GCS
    1716
    1717 void Arguments::set_gc_specific_flags() {
    1718 #if INCLUDE_ALL_GCS
    1719   // Set per-collector flags
    1720   if (UseParallelGC || UseParallelOldGC) {
    1721     set_parallel_gc_flags();
    1722   } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
    1723     set_cms_and_parnew_gc_flags();
    1724   } else if (UseParNewGC) {  // Skipped if CMS is set above
    1725     set_parnew_gc_flags();
    1726   } else if (UseG1GC) {
    1727     set_g1_gc_flags();
    1728   }
    1729   check_deprecated_gcs();
    1730   check_deprecated_gc_flags();
    1731   if (AssumeMP && !UseSerialGC) {
    1732     if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
    1733       warning("If the number of processors is expected to increase from one, then"
    1734               " you should configure the number of parallel GC threads appropriately"
    1735               " using -XX:ParallelGCThreads=N");
    1736     }
    1737   }
    1738   if (MinHeapFreeRatio == 100) {
    1739     // Keeping the heap 100% free is hard ;-) so limit it to 99%.
    1740     FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
    1741   }
    1742 #else // INCLUDE_ALL_GCS
    1743   assert(verify_serial_gc_flags(), "SerialGC unset");
    1744 #endif // INCLUDE_ALL_GCS
    1745 }
    1746
    1747 julong Arguments::limit_by_allocatable_memory(julong limit) {
    1748   julong max_allocatable;
    1749   julong result = limit;
    1750   if (os::has_allocatable_memory_limit(&max_allocatable)) {
    1751     result = MIN2(result, max_allocatable / MaxVirtMemFraction);
    1752   }
    1753   return result;
    1754 }
    1755
    1756 void Arguments::set_heap_size() {
    1757   if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
    1758     // Deprecated flag
    1759     FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
    1760   }
    1761
    1762   const julong phys_mem =
    1763     FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
    1764                             : (julong)MaxRAM;
    1765
    1766   // If the maximum heap size has not been set with -Xmx,
    1767   // then set it as fraction of the size of physical memory,
    1768   // respecting the maximum and minimum sizes of the heap.
    1769   if (FLAG_IS_DEFAULT(MaxHeapSize)) {
    1770     julong reasonable_max = phys_mem / MaxRAMFraction;
    1771
    1772     if (phys_mem <= MaxHeapSize * MinRAMFraction) {
    1773       // Small physical memory, so use a minimum fraction of it for the heap
    1774       reasonable_max = phys_mem / MinRAMFraction;
    1775     } else {
    1776       // Not-small physical memory, so require a heap at least
    1777       // as large as MaxHeapSize
    1778       reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
    1779     }
    1780     if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
    1781       // Limit the heap size to ErgoHeapSizeLimit
    1782       reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
    1783     }
    1784     if (UseCompressedOops) {
    1785       // Limit the heap size to the maximum possible when using compressed oops
    1786       julong max_coop_heap = (julong)max_heap_for_compressed_oops();
    1787       if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
    1788         // Heap should be above HeapBaseMinAddress to get zero based compressed oops
    1789         // but it should be not less than default MaxHeapSize.
    1790         max_coop_heap -= HeapBaseMinAddress;
    1791       }
    1792       reasonable_max = MIN2(reasonable_max, max_coop_heap);
    1793     }
    1794     reasonable_max = limit_by_allocatable_memory(reasonable_max);
    1795
    1796     if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
    1797       // An initial heap size was specified on the command line,
    1798       // so be sure that the maximum size is consistent.  Done
    1799       // after call to limit_by_allocatable_memory because that
    1800       // method might reduce the allocation size.
    1801       reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
    1802     }
    1803
    1804     if (PrintGCDetails && Verbose) {
    1805       // Cannot use gclog_or_tty yet.
    1806       tty->print_cr("  Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
    1807     }
    1808     FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
    1809   }
    1810
    1811   // If the minimum or initial heap_size have not been set or requested to be set
    1812   // ergonomically, set them accordingly.
    1813   if (InitialHeapSize == 0 || min_heap_size() == 0) {
    1814     julong reasonable_minimum = (julong)(OldSize + NewSize);
    1815
    1816     reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
    1817
    1818     reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
    1819
    1820     if (InitialHeapSize == 0) {
    1821       julong reasonable_initial = phys_mem / InitialRAMFraction;
    1822
    1823       reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
    1824       reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
    1825
    1826       reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
    1827
    1828       if (PrintGCDetails && Verbose) {
    1829         // Cannot use gclog_or_tty yet.
    1830         tty->print_cr("  Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
    1831       }
    1832       FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
    1833     }
    1834     // If the minimum heap size has not been set (via -Xms),
    1835     // synchronize with InitialHeapSize to avoid errors with the default value.
    1836     if (min_heap_size() == 0) {
    1837       set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
    1838       if (PrintGCDetails && Verbose) {
    1839         // Cannot use gclog_or_tty yet.
    1840         tty->print_cr("  Minimum heap size " SIZE_FORMAT, min_heap_size());
    1841       }
    1842     }
    1843   }
    1844 }
    1845
    1846 // This must be called after ergonomics because we want bytecode rewriting
    1847 // if the server compiler is used, or if UseSharedSpaces is disabled.
    1848 void Arguments::set_bytecode_flags() {
    1849   // Better not attempt to store into a read-only space.
    1850   if (UseSharedSpaces) {
    1851     FLAG_SET_DEFAULT(RewriteBytecodes, false);
    1852     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
    1853   }
    1854
    1855   if (!RewriteBytecodes) {
    1856     FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
    1857   }
    1858 }
    1859
    1860 // Aggressive optimization flags  -XX:+AggressiveOpts
    1861 void Arguments::set_aggressive_opts_flags() {
    1862 #ifdef COMPILER2
    1863   if (AggressiveUnboxing) {
    1864     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
    1865       FLAG_SET_DEFAULT(EliminateAutoBox, true);
    1866     } else if (!EliminateAutoBox) {
    1867       // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
    1868       AggressiveUnboxing = false;
    1869     }
    1870     if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
    1871       FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
    1872     } else if (!DoEscapeAnalysis) {
    1873       // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
    1874       AggressiveUnboxing = false;
    1875     }
    1876   }
    1877   if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
    1878     if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
    1879       FLAG_SET_DEFAULT(EliminateAutoBox, true);
    1880     }
    1881     if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
    1882       FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
    1883     }
    1884
    1885     // Feed the cache size setting into the JDK
    1886     char buffer[1024];
    1887     sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
    1888     add_property(buffer);
    1889   }
    1890   if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
    1891     FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
    1892   }
    1893 #endif
    1894
    1895   if (AggressiveOpts) {
    1896 // Sample flag setting code
    1897 //    if (FLAG_IS_DEFAULT(EliminateZeroing)) {
    1898 //      FLAG_SET_DEFAULT(EliminateZeroing, true);
    1899 //    }
    1900   }
    1901 }
    1902
    1903 //===========================================================================================================
    1904 // Parsing of java.compiler property
    1905
    1906 void Arguments::process_java_compiler_argument(char* arg) {
    1907   // For backwards compatibility, Djava.compiler=NONE or ""
    1908   // causes us to switch to -Xint mode UNLESS -Xdebug
    1909   // is also specified.
    1910   if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
    1911     set_java_compiler(true);    // "-Djava.compiler[=...]" most recently seen.
    1912   }
    1913 }
    1914
    1915 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
    1916   _sun_java_launcher = strdup(launcher);
    1917   if (strcmp("gamma", _sun_java_launcher) == 0) {
    1918     _created_by_gamma_launcher = true;
    1919   }
    1920 }
    1921
    1922 bool Arguments::created_by_java_launcher() {
    1923   assert(_sun_java_launcher != NULL, "property must have value");
    1924   return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
    1925 }
    1926
    1927 bool Arguments::created_by_gamma_launcher() {
    1928   return _created_by_gamma_launcher;
    1929 }
    1930
    1931 //===========================================================================================================
    1932 // Parsing of main arguments
    1933
    1934 bool Arguments::verify_interval(uintx val, uintx min,
    1935                                 uintx max, const char* name) {
    1936   // Returns true iff value is in the inclusive interval [min..max]
    1937   // false, otherwise.
    1938   if (val >= min && val <= max) {
    1939     return true;
    1940   }
    1941   jio_fprintf(defaultStream::error_stream(),
    1942               "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
    1943               " and " UINTX_FORMAT "\n",
    1944               name, val, min, max);
    1945   return false;
    1946 }
    1947
    1948 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
    1949   // Returns true if given value is at least specified min threshold
    1950   // false, otherwise.
    1951   if (val >= min ) {
    1952       return true;
    1953   }
    1954   jio_fprintf(defaultStream::error_stream(),
    1955               "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
    1956               name, val, min);
    1957   return false;
    1958 }
    1959
    1960 bool Arguments::verify_percentage(uintx value, const char* name) {
    1961   if (is_percentage(value)) {
    1962     return true;
    1963   }
    1964   jio_fprintf(defaultStream::error_stream(),
    1965               "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
    1966               name, value);
    1967   return false;
    1968 }
    1969
    1970 // check if do gclog rotation
    1971 // +UseGCLogFileRotation is a must,
    1972 // no gc log rotation when log file not supplied or
    1973 // NumberOfGCLogFiles is 0
    1974 void check_gclog_consistency() {
    1975   if (UseGCLogFileRotation) {
    1976     if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
    1977       jio_fprintf(defaultStream::output_stream(),
    1978                   "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
    1979                   "where num_of_file > 0\n"
    1980                   "GC log rotation is turned off\n");
    1981       UseGCLogFileRotation = false;
    1982     }
    1983   }
    1984
    1985   if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
    1986     FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
    1987     jio_fprintf(defaultStream::output_stream(),
    1988                 "GCLogFileSize changed to minimum 8K\n");
    1989   }
    1990 }
    1991
    1992 // This function is called for -Xloggc:<filename>, it can be used
    1993 // to check if a given file name(or string) conforms to the following
    1994 // specification:
    1995 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
    1996 // %p and %t only allowed once. We only limit usage of filename not path
    1997 bool is_filename_valid(const char *file_name) {
    1998   const char* p = file_name;
    1999   char file_sep = os::file_separator()[0];
    2000   const char* cp;
    2001   // skip prefix path
    2002   for (cp = file_name; *cp != '\0'; cp++) {
    2003     if (*cp == '/' || *cp == file_sep) {
    2004       p = cp + 1;
    2005     }
    2006   }
    2007
    2008   int count_p = 0;
    2009   int count_t = 0;
    2010   while (*p != '\0') {
    2011     if ((*p >= '0' && *p <= '9') ||
    2012         (*p >= 'A' && *p <= 'Z') ||
    2013         (*p >= 'a' && *p <= 'z') ||
    2014          *p == '-'               ||
    2015          *p == '_'               ||
    2016          *p == '.') {
    2017        p++;
    2018        continue;
    2019     }
    2020     if (*p == '%') {
    2021       if(*(p + 1) == 'p') {
    2022         p += 2;
    2023         count_p ++;
    2024         continue;
    2025       }
    2026       if (*(p + 1) == 't') {
    2027         p += 2;
    2028         count_t ++;
    2029         continue;
    2030       }
    2031     }
    2032     return false;
    2033   }
    2034   return count_p < 2 && count_t < 2;
    2035 }
    2036
    2037 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
    2038   if (!is_percentage(min_heap_free_ratio)) {
    2039     err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
    2040     return false;
    2041   }
    2042   if (min_heap_free_ratio > MaxHeapFreeRatio) {
    2043     err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
    2044                   "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
    2045                   MaxHeapFreeRatio);
    2046     return false;
    2047   }
    2048   // This does not set the flag itself, but stores the value in a safe place for later usage.
    2049   _min_heap_free_ratio = min_heap_free_ratio;
    2050   return true;
    2051 }
    2052
    2053 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
    2054   if (!is_percentage(max_heap_free_ratio)) {
    2055     err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
    2056     return false;
    2057   }
    2058   if (max_heap_free_ratio < MinHeapFreeRatio) {
    2059     err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
    2060                   "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
    2061                   MinHeapFreeRatio);
    2062     return false;
    2063   }
    2064   // This does not set the flag itself, but stores the value in a safe place for later usage.
    2065   _max_heap_free_ratio = max_heap_free_ratio;
    2066   return true;
    2067 }
    2068
    2069 // Check consistency of GC selection
    2070 bool Arguments::check_gc_consistency_user() {
    2071   check_gclog_consistency();
    2072   bool status = true;
    2073   // Ensure that the user has not selected conflicting sets
    2074   // of collectors. [Note: this check is merely a user convenience;
    2075   // collectors over-ride each other so that only a non-conflicting
    2076   // set is selected; however what the user gets is not what they
    2077   // may have expected from the combination they asked for. It's
    2078   // better to reduce user confusion by not allowing them to
    2079   // select conflicting combinations.
    2080   uint i = 0;
    2081   if (UseSerialGC)                       i++;
    2082   if (UseConcMarkSweepGC || UseParNewGC) i++;
    2083   if (UseParallelGC || UseParallelOldGC) i++;
    2084   if (UseG1GC)                           i++;
    2085   if (i > 1) {
    2086     jio_fprintf(defaultStream::error_stream(),
    2087                 "Conflicting collector combinations in option list; "
    2088                 "please refer to the release notes for the combinations "
    2089                 "allowed\n");
    2090     status = false;
    2091   }
    2092   return status;
    2093 }
    2094
    2095 void Arguments::check_deprecated_gcs() {
    2096   if (UseConcMarkSweepGC && !UseParNewGC) {
    2097     warning("Using the DefNew young collector with the CMS collector is deprecated "
    2098         "and will likely be removed in a future release");
    2099   }
    2100
    2101   if (UseParNewGC && !UseConcMarkSweepGC) {
    2102     // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
    2103     // set up UseSerialGC properly, so that can't be used in the check here.
    2104     warning("Using the ParNew young collector with the Serial old collector is deprecated "
    2105         "and will likely be removed in a future release");
    2106   }
    2107
    2108   if (CMSIncrementalMode) {
    2109     warning("Using incremental CMS is deprecated and will likely be removed in a future release");
    2110   }
    2111 }
    2112
    2113 void Arguments::check_deprecated_gc_flags() {
    2114   if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
    2115     warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
    2116             "and will likely be removed in future release");
    2117   }
    2118   if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
    2119     warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
    2120         "Use MaxRAMFraction instead.");
    2121   }
    2122   if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
    2123     warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
    2124   }
    2125   if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
    2126     warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
    2127   }
    2128   if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
    2129     warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
    2130   }
    2131 }
    2132
    2133 // Check stack pages settings
    2134 bool Arguments::check_stack_pages()
    2135 {
    2136   bool status = true;
    2137   status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
    2138   status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
    2139   // greater stack shadow pages can't generate instruction to bang stack
    2140   status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
    2141   return status;
    2142 }
    2143
    2144 // Check the consistency of vm_init_args
    2145 bool Arguments::check_vm_args_consistency() {
    2146   // Method for adding checks for flag consistency.
    2147   // The intent is to warn the user of all possible conflicts,
    2148   // before returning an error.
    2149   // Note: Needs platform-dependent factoring.
    2150   bool status = true;
    2151
    2152   // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
    2153   // builds so the cost of stack banging can be measured.
    2154 #if (defined(PRODUCT) && defined(SOLARIS))
    2155   if (!UseBoundThreads && !UseStackBanging) {
    2156     jio_fprintf(defaultStream::error_stream(),
    2157                 "-UseStackBanging conflicts with -UseBoundThreads\n");
    2158
    2159      status = false;
    2160   }
    2161 #endif
    2162
    2163   if (TLABRefillWasteFraction == 0) {
    2164     jio_fprintf(defaultStream::error_stream(),
    2165                 "TLABRefillWasteFraction should be a denominator, "
    2166                 "not " SIZE_FORMAT "\n",
    2167                 TLABRefillWasteFraction);
    2168     status = false;
    2169   }
    2170
    2171   status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
    2172                               "AdaptiveSizePolicyWeight");
    2173   status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
    2174
    2175   // Divide by bucket size to prevent a large size from causing rollover when
    2176   // calculating amount of memory needed to be allocated for the String table.
    2177   status = status && verify_interval(StringTableSize, minimumStringTableSize,
    2178     (max_uintx / StringTable::bucket_size()), "StringTable size");
    2179
    2180   status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
    2181     (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
    2182
    2183   {
    2184     // Using "else if" below to avoid printing two error messages if min > max.
    2185     // This will also prevent us from reporting both min>100 and max>100 at the
    2186     // same time, but that is less annoying than printing two identical errors IMHO.
    2187     FormatBuffer<80> err_msg("%s","");
    2188     if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
    2189       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
    2190       status = false;
    2191     } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
    2192       jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
    2193       status = false;
    2194     }
    2195   }
    2196
    2197   // Min/MaxMetaspaceFreeRatio
    2198   status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
    2199   status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
    2200
    2201   if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
    2202     jio_fprintf(defaultStream::error_stream(),
    2203                 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
    2204                 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
    2205                 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
    2206                 MinMetaspaceFreeRatio,
    2207                 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
    2208                 MaxMetaspaceFreeRatio);
    2209     status = false;
    2210   }
    2211
    2212   // Trying to keep 100% free is not practical
    2213   MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
    2214
    2215   if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
    2216     MarkSweepAlwaysCompactCount = 1;  // Move objects every gc.
    2217   }
    2218
    2219   if (UseParallelOldGC && ParallelOldGCSplitALot) {
    2220     // Settings to encourage splitting.
    2221     if (!FLAG_IS_CMDLINE(NewRatio)) {
    2222       FLAG_SET_CMDLINE(uintx, NewRatio, 2);
    2223     }
    2224     if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
    2225       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
    2226     }
    2227   }
    2228
    2229   status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
    2230   status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
    2231   if (GCTimeLimit == 100) {
    2232     // Turn off gc-overhead-limit-exceeded checks
    2233     FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
    2234   }
    2235
    2236   status = status && check_gc_consistency_user();
    2237   status = status && check_stack_pages();
    2238
    2239   if (CMSIncrementalMode) {
    2240     if (!UseConcMarkSweepGC) {
    2241       jio_fprintf(defaultStream::error_stream(),
    2242                   "error:  invalid argument combination.\n"
    2243                   "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
    2244                   "selected in order\nto use CMSIncrementalMode.\n");
    2245       status = false;
    2246     } else {
    2247       status = status && verify_percentage(CMSIncrementalDutyCycle,
    2248                                   "CMSIncrementalDutyCycle");
    2249       status = status && verify_percentage(CMSIncrementalDutyCycleMin,
    2250                                   "CMSIncrementalDutyCycleMin");
    2251       status = status && verify_percentage(CMSIncrementalSafetyFactor,
    2252                                   "CMSIncrementalSafetyFactor");
    2253       status = status && verify_percentage(CMSIncrementalOffset,
    2254                                   "CMSIncrementalOffset");
    2255       status = status && verify_percentage(CMSExpAvgFactor,
    2256                                   "CMSExpAvgFactor");
    2257       // If it was not set on the command line, set
    2258       // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
    2259       if (CMSInitiatingOccupancyFraction < 0) {
    2260         FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
    2261       }
    2262     }
    2263   }
    2264
    2265   // CMS space iteration, which FLSVerifyAllHeapreferences entails,
    2266   // insists that we hold the requisite locks so that the iteration is
    2267   // MT-safe. For the verification at start-up and shut-down, we don't
    2268   // yet have a good way of acquiring and releasing these locks,
    2269   // which are not visible at the CollectedHeap level. We want to
    2270   // be able to acquire these locks and then do the iteration rather
    2271   // than just disable the lock verification. This will be fixed under
    2272   // bug 4788986.
    2273   if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
    2274     if (VerifyDuringStartup) {
    2275       warning("Heap verification at start-up disabled "
    2276               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
    2277       VerifyDuringStartup = false; // Disable verification at start-up
    2278     }
    2279
    2280     if (VerifyBeforeExit) {
    2281       warning("Heap verification at shutdown disabled "
    2282               "(due to current incompatibility with FLSVerifyAllHeapReferences)");
    2283       VerifyBeforeExit = false; // Disable verification at shutdown
    2284     }
    2285   }
    2286
    2287   // Note: only executed in non-PRODUCT mode
    2288   if (!UseAsyncConcMarkSweepGC &&
    2289       (ExplicitGCInvokesConcurrent ||
    2290        ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
    2291     jio_fprintf(defaultStream::error_stream(),
    2292                 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
    2293                 " with -UseAsyncConcMarkSweepGC");
    2294     status = false;
    2295   }
    2296
    2297   status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
    2298
    2299 #if INCLUDE_ALL_GCS
    2300   if (UseG1GC) {
    2301     status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
    2302     status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
    2303     status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
    2304
    2305     status = status && verify_percentage(InitiatingHeapOccupancyPercent,
    2306                                          "InitiatingHeapOccupancyPercent");
    2307     status = status && verify_min_value(G1RefProcDrainInterval, 1,
    2308                                         "G1RefProcDrainInterval");
    2309     status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
    2310                                         "G1ConcMarkStepDurationMillis");
    2311     status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
    2312                                        "G1ConcRSHotCardLimit");
    2313     status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
    2314                                        "G1ConcRSLogCacheSize");
    2315     status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
    2316                                        "StringDeduplicationAgeThreshold");
    2317   }
    2318   if (UseConcMarkSweepGC) {
    2319     status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
    2320     status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
    2321     status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
    2322     status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
    2323
    2324     status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
    2325
    2326     status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
    2327     status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
    2328     status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
    2329
    2330     status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
    2331
    2332     status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
    2333     status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
    2334
    2335     status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
    2336     status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
    2337     status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
    2338
    2339     status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
    2340
    2341     status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
    2342
    2343     status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
    2344     status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
    2345     status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
    2346     status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
    2347     status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
    2348   }
    2349
    2350   if (UseParallelGC || UseParallelOldGC) {
    2351     status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
    2352     status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
    2353
    2354     status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
    2355     status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
    2356
    2357     status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
    2358     status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
    2359
    2360     status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
    2361
    2362     status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
    2363   }
    2364 #endif // INCLUDE_ALL_GCS
    2365
    2366   status = status && verify_interval(RefDiscoveryPolicy,
    2367                                      ReferenceProcessor::DiscoveryPolicyMin,
    2368                                      ReferenceProcessor::DiscoveryPolicyMax,
    2369                                      "RefDiscoveryPolicy");
    2370
    2371   // Limit the lower bound of this flag to 1 as it is used in a division
    2372   // expression.
    2373   status = status && verify_interval(TLABWasteTargetPercent,
    2374                                      1, 100, "TLABWasteTargetPercent");
    2375
    2376   status = status && verify_object_alignment();
    2377
    2378   status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
    2379                                       "CompressedClassSpaceSize");
    2380
    2381   status = status && verify_interval(MarkStackSizeMax,
    2382                                   1, (max_jint - 1), "MarkStackSizeMax");
    2383   status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
    2384
    2385   status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
    2386
    2387   status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
    2388
    2389   status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
    2390
    2391   status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
    2392   status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
    2393
    2394   status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
    2395
    2396   status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
    2397   status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
    2398   status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
    2399   status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
    2400
    2401   status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
    2402   status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
    2403
    2404   status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
    2405   status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
    2406   status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
    2407
    2408   status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
    2409   status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
    2410
    2411   // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
    2412   // just for that, so hardcode here.
    2413   status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
    2414   status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
    2415   status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
    2416   status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
    2417
    2418   status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
    2419 #ifdef COMPILER1
    2420   status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
    2421 #endif
    2422
    2423   if (PrintNMTStatistics) {
    2424 #if INCLUDE_NMT
    2425     if (MemTracker::tracking_level() == NMT_off) {
    2426 #endif // INCLUDE_NMT
    2427       warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
    2428       PrintNMTStatistics = false;
    2429 #if INCLUDE_NMT
    2430     }
    2431 #endif
    2432   }
    2433
    2434   // Need to limit the extent of the padding to reasonable size.
    2435   // 8K is well beyond the reasonable HW cache line size, even with the
    2436   // aggressive prefetching, while still leaving the room for segregating
    2437   // among the distinct pages.
    2438   if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
    2439     jio_fprintf(defaultStream::error_stream(),
    2440                 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
    2441                 ContendedPaddingWidth, 0, 8192);
    2442     status = false;
    2443   }
    2444
    2445   // Need to enforce the padding not to break the existing field alignments.
    2446   // It is sufficient to check against the largest type size.
    2447   if ((ContendedPaddingWidth % BytesPerLong) != 0) {
    2448     jio_fprintf(defaultStream::error_stream(),
    2449                 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
    2450                 ContendedPaddingWidth, BytesPerLong);
    2451     status = false;
    2452   }
    2453
    2454   // Check lower bounds of the code cache
    2455   // Template Interpreter code is approximately 3X larger in debug builds.
    2456   uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
    2457   if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
    2458     jio_fprintf(defaultStream::error_stream(),
    2459                 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
    2460                 os::vm_page_size()/K);
    2461     status = false;
    2462   } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
    2463     jio_fprintf(defaultStream::error_stream(),
    2464                 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
    2465                 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
    2466     status = false;
    2467   } else if (ReservedCodeCacheSize < min_code_cache_size) {
    2468     jio_fprintf(defaultStream::error_stream(),
    2469                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
    2470                 min_code_cache_size/K);
    2471     status = false;
    2472   } else if (ReservedCodeCacheSize > 2*G) {
    2473     // Code cache size larger than MAXINT is not supported.
    2474     jio_fprintf(defaultStream::error_stream(),
    2475                 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
    2476                 (2*G)/M);
    2477     status = false;
    2478   }
    2479
    2480   status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
    2481   status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
    2482
    2483   if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
    2484     warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
    2485   }
    2486
    2487 #ifdef COMPILER1
    2488   status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
    2489 #endif
    2490
    2491   int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
    2492   // The default CICompilerCount's value is CI_COMPILER_COUNT.
    2493   assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
    2494   // Check the minimum number of compiler threads
    2495   status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
    2496
    2497   return status;
    2498 }
    2499
    2500 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
    2501   const char* option_type) {
    2502   if (ignore) return false;
    2503
    2504   const char* spacer = " ";
    2505   if (option_type == NULL) {
    2506     option_type = ++spacer; // Set both to the empty string.
    2507   }
    2508
    2509   if (os::obsolete_option(option)) {
    2510     jio_fprintf(defaultStream::error_stream(),
    2511                 "Obsolete %s%soption: %s\n", option_type, spacer,
    2512       option->optionString);
    2513     return false;
    2514   } else {
    2515     jio_fprintf(defaultStream::error_stream(),
    2516                 "Unrecognized %s%soption: %s\n", option_type, spacer,
    2517       option->optionString);
    2518     return true;
    2519   }
    2520 }
    2521
    2522 static const char* user_assertion_options[] = {
    2523   "-da", "-ea", "-disableassertions", "-enableassertions", 0
    2524 };
    2525
    2526 static const char* system_assertion_options[] = {
    2527   "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
    2528 };
    2529
    2530 // Return true if any of the strings in null-terminated array 'names' matches.
    2531 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
    2532 // the option must match exactly.
    2533 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
    2534   bool tail_allowed) {
    2535   for (/* empty */; *names != NULL; ++names) {
    2536     if (match_option(option, *names, tail)) {
    2537       if (**tail == '\0' || tail_allowed && **tail == ':') {
    2538         return true;
    2539       }
    2540     }
    2541   }
    2542   return false;
    2543 }
    2544
    2545 bool Arguments::parse_uintx(const char* value,
    2546                             uintx* uintx_arg,
    2547                             uintx min_size) {
    2548
    2549   // Check the sign first since atomull() parses only unsigned values.
    2550   bool value_is_positive = !(*value == '-');
    2551
    2552   if (value_is_positive) {
    2553     julong n;
    2554     bool good_return = atomull(value, &n);
    2555     if (good_return) {
    2556       bool above_minimum = n >= min_size;
    2557       bool value_is_too_large = n > max_uintx;
    2558
    2559       if (above_minimum && !value_is_too_large) {
    2560         *uintx_arg = n;
    2561         return true;
    2562       }
    2563     }
    2564   }
    2565   return false;
    2566 }
    2567
    2568 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
    2569                                                   julong* long_arg,
    2570                                                   julong min_size) {
    2571   if (!atomull(s, long_arg)) return arg_unreadable;
    2572   return check_memory_size(*long_arg, min_size);
    2573 }
    2574
    2575 // Parse JavaVMInitArgs structure
    2576
    2577 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
    2578   // For components of the system classpath.
    2579   SysClassPath scp(Arguments::get_sysclasspath());
    2580   bool scp_assembly_required = false;
    2581
    2582   // Save default settings for some mode flags
    2583   Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
    2584   Arguments::_UseOnStackReplacement    = UseOnStackReplacement;
    2585   Arguments::_ClipInlining             = ClipInlining;
    2586   Arguments::_BackgroundCompilation    = BackgroundCompilation;
    2587
    2588   // Setup flags for mixed which is the default
    2589   set_mode_flags(_mixed);
    2590
    2591   // Parse JAVA_TOOL_OPTIONS environment variable (if present)
    2592   jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
    2593   if (result != JNI_OK) {
    2594     return result;
    2595   }
    2596
    2597   // Parse JavaVMInitArgs structure passed in
    2598   result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
    2599   if (result != JNI_OK) {
    2600     return result;
    2601   }
    2602
    2603   // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
    2604   result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
    2605   if (result != JNI_OK) {
    2606     return result;
    2607   }
    2608
    2609   // Do final processing now that all arguments have been parsed
    2610   result = finalize_vm_init_args(&scp, scp_assembly_required);
    2611   if (result != JNI_OK) {
    2612     return result;
    2613   }
    2614
    2615   return JNI_OK;
    2616 }
    2617
    2618 // Checks if name in command-line argument -agent{lib,path}:name[=options]
    2619 // represents a valid HPROF of JDWP agent.  is_path==true denotes that we
    2620 // are dealing with -agentpath (case where name is a path), otherwise with
    2621 // -agentlib
    2622 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
    2623   char *_name;
    2624   const char *_hprof = "hprof", *_jdwp = "jdwp";
    2625   size_t _len_hprof, _len_jdwp, _len_prefix;
    2626
    2627   if (is_path) {
    2628     if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
    2629       return false;
    2630     }
    2631
    2632     _name++;  // skip past last path separator
    2633     _len_prefix = strlen(JNI_LIB_PREFIX);
    2634
    2635     if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
    2636       return false;
    2637     }
    2638
    2639     _name += _len_prefix;
    2640     _len_hprof = strlen(_hprof);
    2641     _len_jdwp = strlen(_jdwp);
    2642
    2643     if (strncmp(_name, _hprof, _len_hprof) == 0) {
    2644       _name += _len_hprof;
    2645     }
    2646     else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
    2647       _name += _len_jdwp;
    2648     }
    2649     else {
    2650       return false;
    2651     }
    2652
    2653     if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
    2654       return false;
    2655     }
    2656
    2657     return true;
    2658   }
    2659
    2660   if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
    2661     return true;
    2662   }
    2663
    2664   return false;
    2665 }
    2666
    2667 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
    2668                                        SysClassPath* scp_p,
    2669                                        bool* scp_assembly_required_p,
    2670                                        Flag::Flags origin) {
    2671   // Remaining part of option string
    2672   const char* tail;
    2673
    2674   // iterate over arguments
    2675   for (int index = 0; index < args->nOptions; index++) {
    2676     bool is_absolute_path = false;  // for -agentpath vs -agentlib
    2677
    2678     const JavaVMOption* option = args->options + index;
    2679
    2680     if (!match_option(option, "-Djava.class.path", &tail) &&
    2681         !match_option(option, "-Dsun.java.command", &tail) &&
    2682         !match_option(option, "-Dsun.java.launcher", &tail)) {
    2683
    2684         // add all jvm options to the jvm_args string. This string
    2685         // is used later to set the java.vm.args PerfData string constant.
    2686         // the -Djava.class.path and the -Dsun.java.command options are
    2687         // omitted from jvm_args string as each have their own PerfData
    2688         // string constant object.
    2689         build_jvm_args(option->optionString);
    2690     }
    2691
    2692     // -verbose:[class/gc/jni]
    2693     if (match_option(option, "-verbose", &tail)) {
    2694       if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
    2695         FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
    2696         FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
    2697       } else if (!strcmp(tail, ":gc")) {
    2698         FLAG_SET_CMDLINE(bool, PrintGC, true);
    2699       } else if (!strcmp(tail, ":jni")) {
    2700         FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
    2701       }
    2702     // -da / -ea / -disableassertions / -enableassertions
    2703     // These accept an optional class/package name separated by a colon, e.g.,
    2704     // -da:java.lang.Thread.
    2705     } else if (match_option(option, user_assertion_options, &tail, true)) {
    2706       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
    2707       if (*tail == '\0') {
    2708         JavaAssertions::setUserClassDefault(enable);
    2709       } else {
    2710         assert(*tail == ':', "bogus match by match_option()");
    2711         JavaAssertions::addOption(tail + 1, enable);
    2712       }
    2713     // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
    2714     } else if (match_option(option, system_assertion_options, &tail, false)) {
    2715       bool enable = option->optionString[1] == 'e';     // char after '-' is 'e'
    2716       JavaAssertions::setSystemClassDefault(enable);
    2717     // -bootclasspath:
    2718     } else if (match_option(option, "-Xbootclasspath:", &tail)) {
    2719       scp_p->reset_path(tail);
    2720       *scp_assembly_required_p = true;
    2721     // -bootclasspath/a:
    2722     } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
    2723       scp_p->add_suffix(tail);
    2724       *scp_assembly_required_p = true;
    2725     // -bootclasspath/p:
    2726     } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
    2727       scp_p->add_prefix(tail);
    2728       *scp_assembly_required_p = true;
    2729     // -Xrun
    2730     } else if (match_option(option, "-Xrun", &tail)) {
    2731       if (tail != NULL) {
    2732         const char* pos = strchr(tail, ':');
    2733         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
    2734         char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
    2735         name[len] = '\0';
    2736
    2737         char *options = NULL;
    2738         if(pos != NULL) {
    2739           size_t len2 = strlen(pos+1) + 1; // options start after ':'.  Final zero must be copied.
    2740           options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
    2741         }
    2742 #if !INCLUDE_JVMTI
    2743         if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
    2744           jio_fprintf(defaultStream::error_stream(),
    2745             "Profiling and debugging agents are not supported in this VM\n");
    2746           return JNI_ERR;
    2747         }
    2748 #endif // !INCLUDE_JVMTI
    2749         add_init_library(name, options);
    2750       }
    2751     // -agentlib and -agentpath
    2752     } else if (match_option(option, "-agentlib:", &tail) ||
    2753           (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
    2754       if(tail != NULL) {
    2755         const char* pos = strchr(tail, '=');
    2756         size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
    2757         char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
    2758         name[len] = '\0';
    2759
    2760         char *options = NULL;
    2761         if(pos != NULL) {
    2762           options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
    2763         }
    2764 #if !INCLUDE_JVMTI
    2765         if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
    2766           jio_fprintf(defaultStream::error_stream(),
    2767             "Profiling and debugging agents are not supported in this VM\n");
    2768           return JNI_ERR;
    2769         }
    2770 #endif // !INCLUDE_JVMTI
    2771         add_init_agent(name, options, is_absolute_path);
    2772       }
    2773     // -javaagent
    2774     } else if (match_option(option, "-javaagent:", &tail)) {
    2775 #if !INCLUDE_JVMTI
    2776       jio_fprintf(defaultStream::error_stream(),
    2777         "Instrumentation agents are not supported in this VM\n");
    2778       return JNI_ERR;
    2779 #else
    2780       if(tail != NULL) {
    2781         char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
    2782         add_init_agent("instrument", options, false);
    2783       }
    2784 #endif // !INCLUDE_JVMTI
    2785     // -Xnoclassgc
    2786     } else if (match_option(option, "-Xnoclassgc", &tail)) {
    2787       FLAG_SET_CMDLINE(bool, ClassUnloading, false);
    2788     // -Xincgc: i-CMS
    2789     } else if (match_option(option, "-Xincgc", &tail)) {
    2790       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
    2791       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
    2792     // -Xnoincgc: no i-CMS
    2793     } else if (match_option(option, "-Xnoincgc", &tail)) {
    2794       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
    2795       FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
    2796     // -Xconcgc
    2797     } else if (match_option(option, "-Xconcgc", &tail)) {
    2798       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
    2799     // -Xnoconcgc
    2800     } else if (match_option(option, "-Xnoconcgc", &tail)) {
    2801       FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
    2802     // -Xbatch
    2803     } else if (match_option(option, "-Xbatch", &tail)) {
    2804       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
    2805     // -Xmn for compatibility with other JVM vendors
    2806     } else if (match_option(option, "-Xmn", &tail)) {
    2807       julong long_initial_young_size = 0;
    2808       ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
    2809       if (errcode != arg_in_range) {
    2810         jio_fprintf(defaultStream::error_stream(),
    2811                     "Invalid initial young generation size: %s\n", option->optionString);
    2812         describe_range_error(errcode);
    2813         return JNI_EINVAL;
    2814       }
    2815       FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
    2816       FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
    2817     // -Xms
    2818     } else if (match_option(option, "-Xms", &tail)) {
    2819       julong long_initial_heap_size = 0;
    2820       // an initial heap size of 0 means automatically determine
    2821       ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
    2822       if (errcode != arg_in_range) {
    2823         jio_fprintf(defaultStream::error_stream(),
    2824                     "Invalid initial heap size: %s\n", option->optionString);
    2825         describe_range_error(errcode);
    2826         return JNI_EINVAL;
    2827       }
    2828       set_min_heap_size((uintx)long_initial_heap_size);
    2829       // Currently the minimum size and the initial heap sizes are the same.
    2830       // Can be overridden with -XX:InitialHeapSize.
    2831       FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
    2832     // -Xmx
    2833     } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
    2834       julong long_max_heap_size = 0;
    2835       ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
    2836       if (errcode != arg_in_range) {
    2837         jio_fprintf(defaultStream::error_stream(),
    2838                     "Invalid maximum heap size: %s\n", option->optionString);
    2839         describe_range_error(errcode);
    2840         return JNI_EINVAL;
    2841       }
    2842       FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
    2843     // Xmaxf
    2844     } else if (match_option(option, "-Xmaxf", &tail)) {
    2845       char* err;
    2846       int maxf = (int)(strtod(tail, &err) * 100);
    2847       if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
    2848         jio_fprintf(defaultStream::error_stream(),
    2849                     "Bad max heap free percentage size: %s\n",
    2850                     option->optionString);
    2851         return JNI_EINVAL;
    2852       } else {
    2853         FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
    2854       }
    2855     // Xminf
    2856     } else if (match_option(option, "-Xminf", &tail)) {
    2857       char* err;
    2858       int minf = (int)(strtod(tail, &err) * 100);
    2859       if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
    2860         jio_fprintf(defaultStream::error_stream(),
    2861                     "Bad min heap free percentage size: %s\n",
    2862                     option->optionString);
    2863         return JNI_EINVAL;
    2864       } else {
    2865         FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
    2866       }
    2867     // -Xss
    2868     } else if (match_option(option, "-Xss", &tail)) {
    2869       julong long_ThreadStackSize = 0;
    2870       ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
    2871       if (errcode != arg_in_range) {
    2872         jio_fprintf(defaultStream::error_stream(),
    2873                     "Invalid thread stack size: %s\n", option->optionString);
    2874         describe_range_error(errcode);
    2875         return JNI_EINVAL;
    2876       }
    2877       // Internally track ThreadStackSize in units of 1024 bytes.
    2878       FLAG_SET_CMDLINE(intx, ThreadStackSize,
    2879                               round_to((int)long_ThreadStackSize, K) / K);
    2880     // -Xoss
    2881     } else if (match_option(option, "-Xoss", &tail)) {
    2882           // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
    2883     } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
    2884       julong long_CodeCacheExpansionSize = 0;
    2885       ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
    2886       if (errcode != arg_in_range) {
    2887         jio_fprintf(defaultStream::error_stream(),
    2888                    "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
    2889                    os::vm_page_size()/K);
    2890         return JNI_EINVAL;
    2891       }
    2892       FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
    2893     } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
    2894                match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
    2895       julong long_ReservedCodeCacheSize = 0;
    2896
    2897       ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
    2898       if (errcode != arg_in_range) {
    2899         jio_fprintf(defaultStream::error_stream(),
    2900                     "Invalid maximum code cache size: %s.\n", option->optionString);
    2901         return JNI_EINVAL;
    2902       }
    2903       FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
    2904       //-XX:IncreaseFirstTierCompileThresholdAt=
    2905       } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
    2906         uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
    2907         if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
    2908           jio_fprintf(defaultStream::error_stream(),
    2909                       "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
    2910                       option->optionString);
    2911           return JNI_EINVAL;
    2912         }
    2913         FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
    2914     // -green
    2915     } else if (match_option(option, "-green", &tail)) {
    2916       jio_fprintf(defaultStream::error_stream(),
    2917                   "Green threads support not available\n");
    2918           return JNI_EINVAL;
    2919     // -native
    2920     } else if (match_option(option, "-native", &tail)) {
    2921           // HotSpot always uses native threads, ignore silently for compatibility
    2922     // -Xsqnopause
    2923     } else if (match_option(option, "-Xsqnopause", &tail)) {
    2924           // EVM option, ignore silently for compatibility
    2925     // -Xrs
    2926     } else if (match_option(option, "-Xrs", &tail)) {
    2927           // Classic/EVM option, new functionality
    2928       FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
    2929     } else if (match_option(option, "-Xusealtsigs", &tail)) {
    2930           // change default internal VM signals used - lower case for back compat
    2931       FLAG_SET_CMDLINE(bool, UseAltSigs, true);
    2932     // -Xoptimize
    2933     } else if (match_option(option, "-Xoptimize", &tail)) {
    2934           // EVM option, ignore silently for compatibility
    2935     // -Xprof
    2936     } else if (match_option(option, "-Xprof", &tail)) {
    2937 #if INCLUDE_FPROF
    2938       _has_profile = true;
    2939 #else // INCLUDE_FPROF
    2940       jio_fprintf(defaultStream::error_stream(),
    2941         "Flat profiling is not supported in this VM.\n");
    2942       return JNI_ERR;
    2943 #endif // INCLUDE_FPROF
    2944     // -Xconcurrentio
    2945     } else if (match_option(option, "-Xconcurrentio", &tail)) {
    2946       FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
    2947       FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
    2948       FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
    2949       FLAG_SET_CMDLINE(bool, UseTLAB, false);
    2950       FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K);  // 20Kb per thread added to new generation
    2951
    2952       // -Xinternalversion
    2953     } else if (match_option(option, "-Xinternalversion", &tail)) {
    2954       jio_fprintf(defaultStream::output_stream(), "%s\n",
    2955                   VM_Version::internal_vm_info_string());
    2956       vm_exit(0);
    2957 #ifndef PRODUCT
    2958     // -Xprintflags
    2959     } else if (match_option(option, "-Xprintflags", &tail)) {
    2960       CommandLineFlags::printFlags(tty, false);
    2961       vm_exit(0);
    2962 #endif
    2963     // -D
    2964     } else if (match_option(option, "-D", &tail)) {
    2965       if (CheckEndorsedAndExtDirs) {
    2966         if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
    2967           // abort if -Djava.endorsed.dirs is set
    2968           jio_fprintf(defaultStream::output_stream(),
    2969             "-Djava.endorsed.dirs will not be supported in a future release.\n"
    2970             "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
    2971           return JNI_EINVAL;
    2972         }
    2973         if (match_option(option, "-Djava.ext.dirs=", &tail)) {
    2974           // abort if -Djava.ext.dirs is set
    2975           jio_fprintf(defaultStream::output_stream(),
    2976             "-Djava.ext.dirs will not be supported in a future release.\n"
    2977             "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
    2978           return JNI_EINVAL;
    2979         }
    2980       }
    2981
    2982       if (!add_property(tail)) {
    2983         return JNI_ENOMEM;
    2984       }
    2985       // Out of the box management support
    2986       if (match_option(option, "-Dcom.sun.management", &tail)) {
    2987 #if INCLUDE_MANAGEMENT
    2988         FLAG_SET_CMDLINE(bool, ManagementServer, true);
    2989 #else
    2990         jio_fprintf(defaultStream::output_stream(),
    2991           "-Dcom.sun.management is not supported in this VM.\n");
    2992         return JNI_ERR;
    2993 #endif
    2994       }
    2995     // -Xint
    2996     } else if (match_option(option, "-Xint", &tail)) {
    2997           set_mode_flags(_int);
    2998     // -Xmixed
    2999     } else if (match_option(option, "-Xmixed", &tail)) {
    3000           set_mode_flags(_mixed);
    3001     // -Xcomp
    3002     } else if (match_option(option, "-Xcomp", &tail)) {
    3003       // for testing the compiler; turn off all flags that inhibit compilation
    3004           set_mode_flags(_comp);
    3005     // -Xshare:dump
    3006     } else if (match_option(option, "-Xshare:dump", &tail)) {
    3007       FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
    3008       set_mode_flags(_int);     // Prevent compilation, which creates objects
    3009     // -Xshare:on
    3010     } else if (match_option(option, "-Xshare:on", &tail)) {
    3011       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
    3012       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
    3013     // -Xshare:auto
    3014     } else if (match_option(option, "-Xshare:auto", &tail)) {
    3015       FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
    3016       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
    3017     // -Xshare:off
    3018     } else if (match_option(option, "-Xshare:off", &tail)) {
    3019       FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
    3020       FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
    3021     // -Xverify
    3022     } else if (match_option(option, "-Xverify", &tail)) {
    3023       if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
    3024         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
    3025         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
    3026       } else if (strcmp(tail, ":remote") == 0) {
    3027         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
    3028         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
    3029       } else if (strcmp(tail, ":none") == 0) {
    3030         FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
    3031         FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
    3032       } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
    3033         return JNI_EINVAL;
    3034       }
    3035     // -Xdebug
    3036     } else if (match_option(option, "-Xdebug", &tail)) {
    3037       // note this flag has been used, then ignore
    3038       set_xdebug_mode(true);
    3039     // -Xnoagent
    3040     } else if (match_option(option, "-Xnoagent", &tail)) {
    3041       // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
    3042     } else if (match_option(option, "-Xboundthreads", &tail)) {
    3043       // Bind user level threads to kernel threads (Solaris only)
    3044       FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
    3045     } else if (match_option(option, "-Xloggc:", &tail)) {
    3046       // Redirect GC output to the file. -Xloggc:<filename>
    3047       // ostream_init_log(), when called will use this filename
    3048       // to initialize a fileStream.
    3049       _gc_log_filename = strdup(tail);
    3050      if (!is_filename_valid(_gc_log_filename)) {
    3051        jio_fprintf(defaultStream::output_stream(),
    3052                   "Invalid file name for use with -Xloggc: Filename can only contain the "
    3053                   "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
    3054                   "Note %%p or %%t can only be used once\n", _gc_log_filename);
    3055         return JNI_EINVAL;
    3056       }
    3057       FLAG_SET_CMDLINE(bool, PrintGC, true);
    3058       FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
    3059
    3060     // JNI hooks
    3061     } else if (match_option(option, "-Xcheck", &tail)) {
    3062       if (!strcmp(tail, ":jni")) {
    3063 #if !INCLUDE_JNI_CHECK
    3064         warning("JNI CHECKING is not supported in this VM");
    3065 #else
    3066         CheckJNICalls = true;
    3067 #endif // INCLUDE_JNI_CHECK
    3068       } else if (is_bad_option(option, args->ignoreUnrecognized,
    3069                                      "check")) {
    3070         return JNI_EINVAL;
    3071       }
    3072     } else if (match_option(option, "vfprintf", &tail)) {
    3073       _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
    3074     } else if (match_option(option, "exit", &tail)) {
    3075       _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
    3076     } else if (match_option(option, "abort", &tail)) {
    3077       _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
    3078     // -XX:+AggressiveHeap
    3079     } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
    3080
    3081       // This option inspects the machine and attempts to set various
    3082       // parameters to be optimal for long-running, memory allocation
    3083       // intensive jobs.  It is intended for machines with large
    3084       // amounts of cpu and memory.
    3085
    3086       // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
    3087       // VM, but we may not be able to represent the total physical memory
    3088       // available (like having 8gb of memory on a box but using a 32bit VM).
    3089       // Thus, we need to make sure we're using a julong for intermediate
    3090       // calculations.
    3091       julong initHeapSize;
    3092       julong total_memory = os::physical_memory();
    3093
    3094       if (total_memory < (julong)256*M) {
    3095         jio_fprintf(defaultStream::error_stream(),
    3096                     "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
    3097         vm_exit(1);
    3098       }
    3099
    3100       // The heap size is half of available memory, or (at most)
    3101       // all of possible memory less 160mb (leaving room for the OS
    3102       // when using ISM).  This is the maximum; because adaptive sizing
    3103       // is turned on below, the actual space used may be smaller.
    3104
    3105       initHeapSize = MIN2(total_memory / (julong)2,
    3106                           total_memory - (julong)160*M);
    3107
    3108       initHeapSize = limit_by_allocatable_memory(initHeapSize);
    3109
    3110       if (FLAG_IS_DEFAULT(MaxHeapSize)) {
    3111          FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
    3112          FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
    3113          // Currently the minimum size and the initial heap sizes are the same.
    3114          set_min_heap_size(initHeapSize);
    3115       }
    3116       if (FLAG_IS_DEFAULT(NewSize)) {
    3117          // Make the young generation 3/8ths of the total heap.
    3118          FLAG_SET_CMDLINE(uintx, NewSize,
    3119                                 ((julong)MaxHeapSize / (julong)8) * (julong)3);
    3120          FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
    3121       }
    3122
    3123 #ifndef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
    3124       FLAG_SET_DEFAULT(UseLargePages, true);
    3125 #endif
    3126
    3127       // Increase some data structure sizes for efficiency
    3128       FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
    3129       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
    3130       FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
    3131
    3132       // See the OldPLABSize comment below, but replace 'after promotion'
    3133       // with 'after copying'.  YoungPLABSize is the size of the survivor
    3134       // space per-gc-thread buffers.  The default is 4kw.
    3135       FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K);      // Note: this is in words
    3136
    3137       // OldPLABSize is the size of the buffers in the old gen that
    3138       // UseParallelGC uses to promote live data that doesn't fit in the
    3139       // survivor spaces.  At any given time, there's one for each gc thread.
    3140       // The default size is 1kw. These buffers are rarely used, since the
    3141       // survivor spaces are usually big enough.  For specjbb, however, there
    3142       // are occasions when there's lots of live data in the young gen
    3143       // and we end up promoting some of it.  We don't have a definite
    3144       // explanation for why bumping OldPLABSize helps, but the theory
    3145       // is that a bigger PLAB results in retaining something like the
    3146       // original allocation order after promotion, which improves mutator
    3147       // locality.  A minor effect may be that larger PLABs reduce the
    3148       // number of PLAB allocation events during gc.  The value of 8kw
    3149       // was arrived at by experimenting with specjbb.
    3150       FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K);  // Note: this is in words
    3151
    3152       // Enable parallel GC and adaptive generation sizing
    3153       FLAG_SET_CMDLINE(bool, UseParallelGC, true);
    3154       FLAG_SET_DEFAULT(ParallelGCThreads,
    3155                        Abstract_VM_Version::parallel_worker_threads());
    3156
    3157       // Encourage steady state memory management
    3158       FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
    3159
    3160       // This appears to improve mutator locality
    3161       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
    3162
    3163       // Get around early Solaris scheduling bug
    3164       // (affinity vs other jobs on system)
    3165       // but disallow DR and offlining (5008695).
    3166       FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
    3167
    3168     } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
    3169       // The last option must always win.
    3170       FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
    3171       FLAG_SET_CMDLINE(bool, NeverTenure, true);
    3172     } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
    3173       // The last option must always win.
    3174       FLAG_SET_CMDLINE(bool, NeverTenure, false);
    3175       FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
    3176     } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
    3177                match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
    3178       jio_fprintf(defaultStream::error_stream(),
    3179         "Please use CMSClassUnloadingEnabled in place of "
    3180         "CMSPermGenSweepingEnabled in the future\n");
    3181     } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
    3182       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
    3183       jio_fprintf(defaultStream::error_stream(),
    3184         "Please use -XX:+UseGCOverheadLimit in place of "
    3185         "-XX:+UseGCTimeLimit in the future\n");
    3186     } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
    3187       FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
    3188       jio_fprintf(defaultStream::error_stream(),
    3189         "Please use -XX:-UseGCOverheadLimit in place of "
    3190         "-XX:-UseGCTimeLimit in the future\n");
    3191     // The TLE options are for compatibility with 1.3 and will be
    3192     // removed without notice in a future release.  These options
    3193     // are not to be documented.
    3194     } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
    3195       // No longer used.
    3196     } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
    3197       FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
    3198     } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
    3199       FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
    3200     } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
    3201       FLAG_SET_CMDLINE(bool, PrintTLAB, true);
    3202     } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
    3203       FLAG_SET_CMDLINE(bool, PrintTLAB, false);
    3204     } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
    3205       // No longer used.
    3206     } else if (match_option(option, "-XX:TLESize=", &tail)) {
    3207       julong long_tlab_size = 0;
    3208       ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
    3209       if (errcode != arg_in_range) {
    3210         jio_fprintf(defaultStream::error_stream(),
    3211                     "Invalid TLAB size: %s\n", option->optionString);
    3212         describe_range_error(errcode);
    3213         return JNI_EINVAL;
    3214       }
    3215       FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
    3216     } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
    3217       // No longer used.
    3218     } else if (match_option(option, "-XX:+UseTLE", &tail)) {
    3219       FLAG_SET_CMDLINE(bool, UseTLAB, true);
    3220     } else if (match_option(option, "-XX:-UseTLE", &tail)) {
    3221       FLAG_SET_CMDLINE(bool, UseTLAB, false);
    3222     } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
    3223       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
    3224       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
    3225     } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
    3226       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
    3227       FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
    3228     } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
    3229 #if defined(DTRACE_ENABLED)
    3230       FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
    3231       FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
    3232       FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
    3233       FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
    3234 #else // defined(DTRACE_ENABLED)
    3235       jio_fprintf(defaultStream::error_stream(),
    3236                   "ExtendedDTraceProbes flag is not applicable for this configuration\n");
    3237       return JNI_EINVAL;
    3238 #endif // defined(DTRACE_ENABLED)
    3239 #ifdef ASSERT
    3240     } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
    3241       FLAG_SET_CMDLINE(bool, FullGCALot, true);
    3242       // disable scavenge before parallel mark-compact
    3243       FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
    3244 #endif
    3245     } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
    3246       julong cms_blocks_to_claim = (julong)atol(tail);
    3247       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
    3248       jio_fprintf(defaultStream::error_stream(),
    3249         "Please use -XX:OldPLABSize in place of "
    3250         "-XX:CMSParPromoteBlocksToClaim in the future\n");
    3251     } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
    3252       julong cms_blocks_to_claim = (julong)atol(tail);
    3253       FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
    3254       jio_fprintf(defaultStream::error_stream(),
    3255         "Please use -XX:OldPLABSize in place of "
    3256         "-XX:ParCMSPromoteBlocksToClaim in the future\n");
    3257     } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
    3258       julong old_plab_size = 0;
    3259       ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
    3260       if (errcode != arg_in_range) {
    3261         jio_fprintf(defaultStream::error_stream(),
    3262                     "Invalid old PLAB size: %s\n", option->optionString);
    3263         describe_range_error(errcode);
    3264         return JNI_EINVAL;
    3265       }
    3266       FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
    3267       jio_fprintf(defaultStream::error_stream(),
    3268                   "Please use -XX:OldPLABSize in place of "
    3269                   "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
    3270     } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
    3271       julong young_plab_size = 0;
    3272       ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
    3273       if (errcode != arg_in_range) {
    3274         jio_fprintf(defaultStream::error_stream(),
    3275                     "Invalid young PLAB size: %s\n", option->optionString);
    3276         describe_range_error(errcode);
    3277         return JNI_EINVAL;
    3278       }
    3279       FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
    3280       jio_fprintf(defaultStream::error_stream(),
    3281                   "Please use -XX:YoungPLABSize in place of "
    3282                   "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
    3283     } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
    3284                match_option(option, "-XX:G1MarkStackSize=", &tail)) {
    3285       julong stack_size = 0;
    3286       ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
    3287       if (errcode != arg_in_range) {
    3288         jio_fprintf(defaultStream::error_stream(),
    3289                     "Invalid mark stack size: %s\n", option->optionString);
    3290         describe_range_error(errcode);
    3291         return JNI_EINVAL;
    3292       }
    3293       FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
    3294     } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
    3295       julong max_stack_size = 0;
    3296       ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
    3297       if (errcode != arg_in_range) {
    3298         jio_fprintf(defaultStream::error_stream(),
    3299                     "Invalid maximum mark stack size: %s\n",
    3300                     option->optionString);
    3301         describe_range_error(errcode);
    3302         return JNI_EINVAL;
    3303       }
    3304       FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
    3305     } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
    3306                match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
    3307       uintx conc_threads = 0;
    3308       if (!parse_uintx(tail, &conc_threads, 1)) {
    3309         jio_fprintf(defaultStream::error_stream(),
    3310                     "Invalid concurrent threads: %s\n", option->optionString);
    3311         return JNI_EINVAL;
    3312       }
    3313       FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
    3314     } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
    3315       julong max_direct_memory_size = 0;
    3316       ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
    3317       if (errcode != arg_in_range) {
    3318         jio_fprintf(defaultStream::error_stream(),
    3319                     "Invalid maximum direct memory size: %s\n",
    3320                     option->optionString);
    3321         describe_range_error(errcode);
    3322         return JNI_EINVAL;
    3323       }
    3324       FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
    3325     } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
    3326       // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
    3327       //       away and will cause VM initialization failures!
    3328       warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
    3329       FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
    3330 #if !INCLUDE_MANAGEMENT
    3331     } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
    3332         jio_fprintf(defaultStream::error_stream(),
    3333           "ManagementServer is not supported in this VM.\n");
    3334         return JNI_ERR;
    3335 #endif // INCLUDE_MANAGEMENT
    3336     } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
    3337       // Skip -XX:Flags= since that case has already been handled
    3338       if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
    3339         if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
    3340           return JNI_EINVAL;
    3341         }
    3342       }
    3343     // Unknown option
    3344     } else if (is_bad_option(option, args->ignoreUnrecognized)) {
    3345       return JNI_ERR;
    3346     }
    3347   }
    3348
    3349   // PrintSharedArchiveAndExit will turn on
    3350   //   -Xshare:on
    3351   //   -XX:+TraceClassPaths
    3352   if (PrintSharedArchiveAndExit) {
    3353     FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
    3354     FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
    3355     FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
    3356   }
    3357
    3358   // Change the default value for flags  which have different default values
    3359   // when working with older JDKs.
    3360 #ifdef LINUX
    3361  if (JDK_Version::current().compare_major(6) <= 0 &&
    3362       FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
    3363     FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
    3364   }
    3365 #endif // LINUX
    3366   fix_appclasspath();
    3367   return JNI_OK;
    3368 }
    3369
    3370 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
    3371 //
    3372 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
    3373 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
    3374 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
    3375 // path is treated as the current directory.
    3376 //
    3377 // This causes problems with CDS, which requires that all directories specified in the classpath
    3378 // must be empty. In most cases, applications do NOT want to load classes from the current
    3379 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
    3380 // scripts compatible with CDS.
    3381 void Arguments::fix_appclasspath() {
    3382   if (IgnoreEmptyClassPaths) {
    3383     const char separator = *os::path_separator();
    3384     const char* src = _java_class_path->value();
    3385
    3386     // skip over all the leading empty paths
    3387     while (*src == separator) {
    3388       src ++;
    3389     }
    3390
    3391     char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
    3392     strncpy(copy, src, strlen(src) + 1);
    3393
    3394     // trim all trailing empty paths
    3395     for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
    3396       *tail = '\0';
    3397     }
    3398
    3399     char from[3] = {separator, separator, '\0'};
    3400     char to  [2] = {separator, '\0'};
    3401     while (StringUtils::replace_no_expand(copy, from, to) > 0) {
    3402       // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
    3403       // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
    3404     }
    3405
    3406     _java_class_path->set_value(copy);
    3407     FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
    3408   }
    3409
    3410   if (!PrintSharedArchiveAndExit) {
    3411     ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
    3412   }
    3413 }
    3414
    3415 static bool has_jar_files(const char* directory) {
    3416   DIR* dir = os::opendir(directory);
    3417   if (dir == NULL) return false;
    3418
    3419   struct dirent *entry;
    3420   char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
    3421   bool hasJarFile = false;
    3422   while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
    3423     const char* name = entry->d_name;
    3424     const char* ext = name + strlen(name) - 4;
    3425     hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
    3426   }
    3427   FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
    3428   os::closedir(dir);
    3429   return hasJarFile ;
    3430 }
    3431
    3432 // returns the number of directories in the given path containing JAR files
    3433 // If the skip argument is not NULL, it will skip that directory
    3434 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
    3435   const char separator = *os::path_separator();
    3436   const char* const end = path + strlen(path);
    3437   int nonEmptyDirs = 0;
    3438   while (path < end) {
    3439     const char* tmp_end = strchr(path, separator);
    3440     if (tmp_end == NULL) {
    3441       if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
    3442         nonEmptyDirs++;
    3443         jio_fprintf(defaultStream::output_stream(),
    3444           "Non-empty %s directory: %s\n", type, path);
    3445       }
    3446       path = end;
    3447     } else {
    3448       char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
    3449       memcpy(dirpath, path, tmp_end - path);
    3450       dirpath[tmp_end - path] = '\0';
    3451       if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
    3452         nonEmptyDirs++;
    3453         jio_fprintf(defaultStream::output_stream(),
    3454           "Non-empty %s directory: %s\n", type, dirpath);
    3455       }
    3456       FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
    3457       path = tmp_end + 1;
    3458     }
    3459   }
    3460   return nonEmptyDirs;
    3461 }
    3462
    3463 // Returns true if endorsed standards override mechanism and extension mechanism
    3464 // are not used.
    3465 static bool check_endorsed_and_ext_dirs() {
    3466   if (!CheckEndorsedAndExtDirs)
    3467     return true;
    3468
    3469   char endorsedDir[JVM_MAXPATHLEN];
    3470   char extDir[JVM_MAXPATHLEN];
    3471   const char* fileSep = os::file_separator();
    3472   jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
    3473                Arguments::get_java_home(), fileSep, fileSep);
    3474   jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
    3475                Arguments::get_java_home(), fileSep, fileSep);
    3476
    3477   // check endorsed directory
    3478   int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
    3479
    3480   // check the extension directories but skip the default lib/ext directory
    3481   nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
    3482
    3483   // List of JAR files installed in the default lib/ext directory.
    3484   // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
    3485   static const char* jdk_ext_jars[] = {
    3486       "access-bridge-32.jar",
    3487       "access-bridge-64.jar",
    3488       "access-bridge.jar",
    3489       "cldrdata.jar",
    3490       "dnsns.jar",
    3491       "jaccess.jar",
    3492       "jfxrt.jar",
    3493       "localedata.jar",
    3494       "nashorn.jar",
    3495       "sunec.jar",
    3496       "sunjce_provider.jar",
    3497       "sunmscapi.jar",
    3498       "sunpkcs11.jar",
    3499       "ucrypto.jar",
    3500       "zipfs.jar",
    3501       NULL
    3502   };
    3503
    3504   // check if the default lib/ext directory has any non-JDK jar files; if so, error
    3505   DIR* dir = os::opendir(extDir);
    3506   if (dir != NULL) {
    3507     int num_ext_jars = 0;
    3508     struct dirent *entry;
    3509     char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
    3510     while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
    3511       const char* name = entry->d_name;
    3512       const char* ext = name + strlen(name) - 4;
    3513       if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
    3514         bool is_jdk_jar = false;
    3515         const char* jarfile = NULL;
    3516         for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
    3517           if (os::file_name_strcmp(name, jarfile) == 0) {
    3518             is_jdk_jar = true;
    3519             break;
    3520           }
    3521         }
    3522         if (!is_jdk_jar) {
    3523           jio_fprintf(defaultStream::output_stream(),
    3524             "%s installed in <JAVA_HOME>/lib/ext\n", name);
    3525           num_ext_jars++;
    3526         }
    3527       }
    3528     }
    3529     FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
    3530     os::closedir(dir);
    3531     if (num_ext_jars > 0) {
    3532       nonEmptyDirs += 1;
    3533     }
    3534   }
    3535
    3536   // check if the default lib/endorsed directory exists; if so, error
    3537   dir = os::opendir(endorsedDir);
    3538   if (dir != NULL) {
    3539     jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
    3540     os::closedir(dir);
    3541     nonEmptyDirs += 1;
    3542   }
    3543
    3544   if (nonEmptyDirs > 0) {
    3545     jio_fprintf(defaultStream::output_stream(),
    3546       "Endorsed standards override mechanism and extension mechanism "
    3547       "will not be supported in a future release.\n"
    3548       "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
    3549     return false;
    3550   }
    3551
    3552   return true;
    3553 }
    3554
    3555 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
    3556   // This must be done after all -D arguments have been processed.
    3557   scp_p->expand_endorsed();
    3558
    3559   if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
    3560     // Assemble the bootclasspath elements into the final path.
    3561     Arguments::set_sysclasspath(scp_p->combined_path());
    3562   }
    3563
    3564   if (!check_endorsed_and_ext_dirs()) {
    3565     return JNI_ERR;
    3566   }
    3567
    3568   // This must be done after all arguments have been processed.
    3569   // java_compiler() true means set to "NONE" or empty.
    3570   if (java_compiler() && !xdebug_mode()) {
    3571     // For backwards compatibility, we switch to interpreted mode if
    3572     // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
    3573     // not specified.
    3574     set_mode_flags(_int);
    3575   }
    3576   if (CompileThreshold == 0) {
    3577     set_mode_flags(_int);
    3578   }
    3579
    3580   // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
    3581   if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
    3582     FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
    3583   }
    3584
    3585 #ifndef COMPILER2
    3586   // Don't degrade server performance for footprint
    3587   if (FLAG_IS_DEFAULT(UseLargePages) &&
    3588       MaxHeapSize < LargePageHeapSizeThreshold) {
    3589     // No need for large granularity pages w/small heaps.
    3590     // Note that large pages are enabled/disabled for both the
    3591     // Java heap and the code cache.
    3592     FLAG_SET_DEFAULT(UseLargePages, false);
    3593   }
    3594
    3595 #else
    3596   if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
    3597     FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
    3598   }
    3599 #endif
    3600
    3601 #ifndef TIERED
    3602   // Tiered compilation is undefined.
    3603   UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
    3604 #endif
    3605
    3606   // If we are running in a headless jre, force java.awt.headless property
    3607   // to be true unless the property has already been set.
    3608   // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
    3609   if (os::is_headless_jre()) {
    3610     const char* headless = Arguments::get_property("java.awt.headless");
    3611     if (headless == NULL) {
    3612       char envbuffer[128];
    3613       if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
    3614         if (!add_property("java.awt.headless=true")) {
    3615           return JNI_ENOMEM;
    3616         }
    3617       } else {
    3618         char buffer[256];
    3619         strcpy(buffer, "java.awt.headless=");
    3620         strcat(buffer, envbuffer);
    3621         if (!add_property(buffer)) {
    3622           return JNI_ENOMEM;
    3623         }
    3624       }
    3625     }
    3626   }
    3627
    3628   if (!check_vm_args_consistency()) {
    3629     return JNI_ERR;
    3630   }
    3631
    3632   return JNI_OK;
    3633 }
    3634
    3635 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
    3636   return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
    3637                                             scp_assembly_required_p);
    3638 }
    3639
    3640 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
    3641   return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
    3642                                             scp_assembly_required_p);
    3643 }
    3644
    3645 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
    3646   const int N_MAX_OPTIONS = 64;
    3647   const int OPTION_BUFFER_SIZE = 1024;
    3648   char buffer[OPTION_BUFFER_SIZE];
    3649
    3650   // The variable will be ignored if it exceeds the length of the buffer.
    3651   // Don't check this variable if user has special privileges
    3652   // (e.g. unix su command).
    3653   if (os::getenv(name, buffer, sizeof(buffer)) &&
    3654       !os::have_special_privileges()) {
    3655     JavaVMOption options[N_MAX_OPTIONS];      // Construct option array
    3656     jio_fprintf(defaultStream::error_stream(),
    3657                 "Picked up %s: %s\n", name, buffer);
    3658     char* rd = buffer;                        // pointer to the input string (rd)
    3659     int i;
    3660     for (i = 0; i < N_MAX_OPTIONS;) {         // repeat for all options in the input string
    3661       while (isspace(*rd)) rd++;              // skip whitespace
    3662       if (*rd == 0) break;                    // we re done when the input string is read completely
    3663
    3664       // The output, option string, overwrites the input string.
    3665       // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
    3666       // input string (rd).
    3667       char* wrt = rd;
    3668
    3669       options[i++].optionString = wrt;        // Fill in option
    3670       while (*rd != 0 && !isspace(*rd)) {     // unquoted strings terminate with a space or NULL
    3671         if (*rd == '\'' || *rd == '"') {      // handle a quoted string
    3672           int quote = *rd;                    // matching quote to look for
    3673           rd++;                               // don't copy open quote
    3674           while (*rd != quote) {              // include everything (even spaces) up until quote
    3675             if (*rd == 0) {                   // string termination means unmatched string
    3676               jio_fprintf(defaultStream::error_stream(),
    3677                           "Unmatched quote in %s\n", name);
    3678               return JNI_ERR;
    3679             }
    3680             *wrt++ = *rd++;                   // copy to option string
    3681           }
    3682           rd++;                               // don't copy close quote
    3683         } else {
    3684           *wrt++ = *rd++;                     // copy to option string
    3685         }
    3686       }
    3687       // Need to check if we're done before writing a NULL,
    3688       // because the write could be to the byte that rd is pointing to.
    3689       if (*rd++ == 0) {
    3690         *wrt = 0;
    3691         break;
    3692       }
    3693       *wrt = 0;                               // Zero terminate option
    3694     }
    3695     // Construct JavaVMInitArgs structure and parse as if it was part of the command line
    3696     JavaVMInitArgs vm_args;
    3697     vm_args.version = JNI_VERSION_1_2;
    3698     vm_args.options = options;
    3699     vm_args.nOptions = i;
    3700     vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
    3701
    3702     if (PrintVMOptions) {
    3703       const char* tail;
    3704       for (int i = 0; i < vm_args.nOptions; i++) {
    3705         const JavaVMOption *option = vm_args.options + i;
    3706         if (match_option(option, "-XX:", &tail)) {
    3707           logOption(tail);
    3708         }
    3709       }
    3710     }
    3711
    3712     return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
    3713   }
    3714   return JNI_OK;
    3715 }
    3716
    3717 void Arguments::set_shared_spaces_flags() {
    3718   if (DumpSharedSpaces) {
    3719     if (RequireSharedSpaces) {
    3720       warning("cannot dump shared archive while using shared archive");
    3721     }
    3722     UseSharedSpaces = false;
    3723 #ifdef _LP64
    3724     if (!UseCompressedOops || !UseCompressedClassPointers) {
    3725       vm_exit_during_initialization(
    3726         "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
    3727     }
    3728   } else {
    3729     if (!UseCompressedOops || !UseCompressedClassPointers) {
    3730       no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
    3731     }
    3732 #endif
    3733   }
    3734 }
    3735
    3736 #if !INCLUDE_ALL_GCS
    3737 static void force_serial_gc() {
    3738   FLAG_SET_DEFAULT(UseSerialGC, true);
    3739   FLAG_SET_DEFAULT(CMSIncrementalMode, false);  // special CMS suboption
    3740   UNSUPPORTED_GC_OPTION(UseG1GC);
    3741   UNSUPPORTED_GC_OPTION(UseParallelGC);
    3742   UNSUPPORTED_GC_OPTION(UseParallelOldGC);
    3743   UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
    3744   UNSUPPORTED_GC_OPTION(UseParNewGC);
    3745 }
    3746 #endif // INCLUDE_ALL_GCS
    3747
    3748 // Sharing support
    3749 // Construct the path to the archive
    3750 static char* get_shared_archive_path() {
    3751   char *shared_archive_path;
    3752   if (SharedArchiveFile == NULL) {
    3753     char jvm_path[JVM_MAXPATHLEN];
    3754     os::jvm_path(jvm_path, sizeof(jvm_path));
    3755     char *end = strrchr(jvm_path, *os::file_separator());
    3756     if (end != NULL) *end = '\0';
    3757     size_t jvm_path_len = strlen(jvm_path);
    3758     size_t file_sep_len = strlen(os::file_separator());
    3759     shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
    3760         file_sep_len + 20, mtInternal);
    3761     if (shared_archive_path != NULL) {
    3762       strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
    3763       strncat(shared_archive_path, os::file_separator(), file_sep_len);
    3764       strncat(shared_archive_path, "classes.jsa", 11);
    3765     }
    3766   } else {
    3767     shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
    3768     if (shared_archive_path != NULL) {
    3769       strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
    3770     }
    3771   }
    3772   return shared_archive_path;
    3773 }
    3774
    3775 #ifndef PRODUCT
    3776 // Determine whether LogVMOutput should be implicitly turned on.
    3777 static bool use_vm_log() {
    3778   if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
    3779       PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
    3780       PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
    3781       PrintAssembly || TraceDeoptimization || TraceDependencies ||
    3782       (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
    3783     return true;
    3784   }
    3785
    3786 #ifdef COMPILER1
    3787   if (PrintC1Statistics) {
    3788     return true;
    3789   }
    3790 #endif // COMPILER1
    3791
    3792 #ifdef COMPILER2
    3793   if (PrintOptoAssembly || PrintOptoStatistics) {
    3794     return true;
    3795   }
    3796 #endif // COMPILER2
    3797
    3798   return false;
    3799 }
    3800 #endif // PRODUCT
    3801
    3802 // Parse entry point called from JNI_CreateJavaVM
    3803
    3804 jint Arguments::parse(const JavaVMInitArgs* args) {
    3805
    3806   // Remaining part of option string
    3807   const char* tail;
    3808
    3809   // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
    3810   const char* hotspotrc = ".hotspotrc";
    3811   bool settings_file_specified = false;
    3812   bool needs_hotspotrc_warning = false;
    3813
    3814   ArgumentsExt::process_options(args);
    3815
    3816   const char* flags_file;
    3817   int index;
    3818   for (index = 0; index < args->nOptions; index++) {
    3819     const JavaVMOption *option = args->options + index;
    3820     if (match_option(option, "-XX:Flags=", &tail)) {
    3821       flags_file = tail;
    3822       settings_file_specified = true;
    3823     }
    3824     if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
    3825       PrintVMOptions = true;
    3826     }
    3827     if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
    3828       PrintVMOptions = false;
    3829     }
    3830     if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
    3831       IgnoreUnrecognizedVMOptions = true;
    3832     }
    3833     if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
    3834       IgnoreUnrecognizedVMOptions = false;
    3835     }
    3836     if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
    3837       CommandLineFlags::printFlags(tty, false);
    3838       vm_exit(0);
    3839     }
    3840 #if INCLUDE_NMT
    3841     if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
    3842       // The launcher did not setup nmt environment variable properly.
    3843       if (!MemTracker::check_launcher_nmt_support(tail)) {
    3844         warning("Native Memory Tracking did not setup properly, using wrong launcher?");
    3845       }
    3846
    3847       // Verify if nmt option is valid.
    3848       if (MemTracker::verify_nmt_option()) {
    3849         // Late initialization, still in single-threaded mode.
    3850         if (MemTracker::tracking_level() >= NMT_summary) {
    3851           MemTracker::init();
    3852         }
    3853       } else {
    3854         vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
    3855       }
    3856     }
    3857 #endif
    3858
    3859
    3860 #ifndef PRODUCT
    3861     if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
    3862       CommandLineFlags::printFlags(tty, true);
    3863       vm_exit(0);
    3864     }
    3865 #endif
    3866   }
    3867
    3868   if (IgnoreUnrecognizedVMOptions) {
    3869     // uncast const to modify the flag args->ignoreUnrecognized
    3870     *(jboolean*)(&args->ignoreUnrecognized) = true;
    3871   }
    3872
    3873   // Parse specified settings file
    3874   if (settings_file_specified) {
    3875     if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
    3876       return JNI_EINVAL;
    3877     }
    3878   } else {
    3879 #ifdef ASSERT
    3880     // Parse default .hotspotrc settings file
    3881     if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
    3882       return JNI_EINVAL;
    3883     }
    3884 #else
    3885     struct stat buf;
    3886     if (os::stat(hotspotrc, &buf) == 0) {
    3887       needs_hotspotrc_warning = true;
    3888     }
    3889 #endif
    3890   }
    3891
    3892   if (PrintVMOptions) {
    3893     for (index = 0; index < args->nOptions; index++) {
    3894       const JavaVMOption *option = args->options + index;
    3895       if (match_option(option, "-XX:", &tail)) {
    3896         logOption(tail);
    3897       }
    3898     }
    3899   }
    3900
    3901   // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
    3902   jint result = parse_vm_init_args(args);
    3903   if (result != JNI_OK) {
    3904     return result;
    3905   }
    3906
    3907   // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
    3908   SharedArchivePath = get_shared_archive_path();
    3909   if (SharedArchivePath == NULL) {
    3910     return JNI_ENOMEM;
    3911   }
    3912
    3913   // Set up VerifySharedSpaces
    3914   if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
    3915     VerifySharedSpaces = true;
    3916   }
    3917
    3918   // Delay warning until here so that we've had a chance to process
    3919   // the -XX:-PrintWarnings flag
    3920   if (needs_hotspotrc_warning) {
    3921     warning("%s file is present but has been ignored.  "
    3922             "Run with -XX:Flags=%s to load the file.",
    3923             hotspotrc, hotspotrc);
    3924   }
    3925
    3926 #ifdef _ALLBSD_SOURCE  // UseLargePages is not yet supported on BSD.
    3927   UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
    3928 #endif
    3929
    3930 #if INCLUDE_ALL_GCS
    3931   #if (defined JAVASE_EMBEDDED || defined ARM)
    3932     UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
    3933   #endif
    3934 #endif
    3935
    3936 #ifndef PRODUCT
    3937   if (TraceBytecodesAt != 0) {
    3938     TraceBytecodes = true;
    3939   }
    3940   if (CountCompiledCalls) {
    3941     if (UseCounterDecay) {
    3942       warning("UseCounterDecay disabled because CountCalls is set");
    3943       UseCounterDecay = false;
    3944     }
    3945   }
    3946 #endif // PRODUCT
    3947
    3948   // JSR 292 is not supported before 1.7
    3949   if (!JDK_Version::is_gte_jdk17x_version()) {
    3950     if (EnableInvokeDynamic) {
    3951       if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
    3952         warning("JSR 292 is not supported before 1.7.  Disabling support.");
    3953       }
    3954       EnableInvokeDynamic = false;
    3955     }
    3956   }
    3957
    3958   if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
    3959     if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
    3960       warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
    3961     }
    3962     ScavengeRootsInCode = 1;
    3963   }
    3964
    3965   if (PrintGCDetails) {
    3966     // Turn on -verbose:gc options as well
    3967     PrintGC = true;
    3968   }
    3969
    3970   if (!JDK_Version::is_gte_jdk18x_version()) {
    3971     // To avoid changing the log format for 7 updates this flag is only
    3972     // true by default in JDK8 and above.
    3973     if (FLAG_IS_DEFAULT(PrintGCCause)) {
    3974       FLAG_SET_DEFAULT(PrintGCCause, false);
    3975     }
    3976   }
    3977
    3978   // Set object alignment values.
    3979   set_object_alignment();
    3980
    3981 #if !INCLUDE_ALL_GCS
    3982   force_serial_gc();
    3983 #endif // INCLUDE_ALL_GCS
    3984 #if !INCLUDE_CDS
    3985   if (DumpSharedSpaces || RequireSharedSpaces) {
    3986     jio_fprintf(defaultStream::error_stream(),
    3987       "Shared spaces are not supported in this VM\n");
    3988     return JNI_ERR;
    3989   }
    3990   if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
    3991     warning("Shared spaces are not supported in this VM");
    3992     FLAG_SET_DEFAULT(UseSharedSpaces, false);
    3993     FLAG_SET_DEFAULT(PrintSharedSpaces, false);
    3994   }
    3995   no_shared_spaces("CDS Disabled");
    3996 #endif // INCLUDE_CDS
    3997
    3998   return JNI_OK;
    3999 }
    4000
    4001 jint Arguments::apply_ergo() {
    4002
    4003   // Set flags based on ergonomics.
    4004   set_ergonomics_flags();
    4005
    4006   set_shared_spaces_flags();
    4007
    4008   // Check the GC selections again.
    4009   if (!ArgumentsExt::check_gc_consistency_ergo()) {
    4010     return JNI_EINVAL;
    4011   }
    4012
    4013   if (TieredCompilation) {
    4014     set_tiered_flags();
    4015   } else {
    4016     // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
    4017     if (CompilationPolicyChoice >= 2) {
    4018       vm_exit_during_initialization(
    4019         "Incompatible compilation policy selected", NULL);
    4020     }
    4021   }
    4022   // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
    4023   if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
    4024     FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
    4025   }
    4026
    4027
    4028   // Set heap size based on available physical memory
    4029   set_heap_size();
    4030
    4031   ArgumentsExt::set_gc_specific_flags();
    4032
    4033   // Initialize Metaspace flags and alignments.
    4034   Metaspace::ergo_initialize();
    4035
    4036   // Set bytecode rewriting flags
    4037   set_bytecode_flags();
    4038
    4039   // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
    4040   set_aggressive_opts_flags();
    4041
    4042   // Turn off biased locking for locking debug mode flags,
    4043   // which are subtlely different from each other but neither works with
    4044   // biased locking.
    4045   if (UseHeavyMonitors
    4046 #ifdef COMPILER1
    4047       || !UseFastLocking
    4048 #endif // COMPILER1
    4049     ) {
    4050     if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
    4051       // flag set to true on command line; warn the user that they
    4052       // can't enable biased locking here
    4053       warning("Biased Locking is not supported with locking debug flags"
    4054               "; ignoring UseBiasedLocking flag." );
    4055     }
    4056     UseBiasedLocking = false;
    4057   }
    4058
    4059 #ifdef ZERO
    4060   // Clear flags not supported on zero.
    4061   FLAG_SET_DEFAULT(ProfileInterpreter, false);
    4062   FLAG_SET_DEFAULT(UseBiasedLocking, false);
    4063   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
    4064   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
    4065 #endif // CC_INTERP
    4066
    4067 #ifdef COMPILER2
    4068   if (!EliminateLocks) {
    4069     EliminateNestedLocks = false;
    4070   }
    4071   if (!Inline) {
    4072     IncrementalInline = false;
    4073   }
    4074 #ifndef PRODUCT
    4075   if (!IncrementalInline) {
    4076     AlwaysIncrementalInline = false;
    4077   }
    4078 #endif
    4079   if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
    4080     // incremental inlining: bump MaxNodeLimit
    4081     FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
    4082   }
    4083   if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
    4084     // nothing to use the profiling, turn if off
    4085     FLAG_SET_DEFAULT(TypeProfileLevel, 0);
    4086   }
    4087 #endif
    4088
    4089   if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
    4090     warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
    4091     DebugNonSafepoints = true;
    4092   }
    4093
    4094   if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
    4095     warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
    4096   }
    4097
    4098 #ifndef PRODUCT
    4099   if (CompileTheWorld) {
    4100     // Force NmethodSweeper to sweep whole CodeCache each time.
    4101     if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
    4102       NmethodSweepFraction = 1;
    4103     }
    4104   }
    4105
    4106   if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
    4107     if (use_vm_log()) {
    4108       LogVMOutput = true;
    4109     }
    4110   }
    4111 #endif // PRODUCT
    4112
    4113   if (PrintCommandLineFlags) {
    4114     CommandLineFlags::printSetFlags(tty);
    4115   }
    4116
    4117   // Apply CPU specific policy for the BiasedLocking
    4118   if (UseBiasedLocking) {
    4119     if (!VM_Version::use_biased_locking() &&
    4120         !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
    4121       UseBiasedLocking = false;
    4122     }
    4123   }
    4124 #ifdef COMPILER2
    4125   if (!UseBiasedLocking || EmitSync != 0) {
    4126     UseOptoBiasInlining = false;
    4127   }
    4128 #endif
    4129
    4130   // set PauseAtExit if the gamma launcher was used and a debugger is attached
    4131   // but only if not already set on the commandline
    4132   if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
    4133     bool set = false;
    4134     CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
    4135     if (!set) {
    4136       FLAG_SET_DEFAULT(PauseAtExit, true);
    4137     }
    4138   }
    4139
    4140   return JNI_OK;
    4141 }
    4142
    4143 jint Arguments::adjust_after_os() {
    4144   if (UseNUMA) {
    4145     if (UseParallelGC || UseParallelOldGC) {
    4146       if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
    4147          FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
    4148       }
    4149     }
    4150     // UseNUMAInterleaving is set to ON for all collectors and
    4151     // platforms when UseNUMA is set to ON. NUMA-aware collectors
    4152     // such as the parallel collector for Linux and Solaris will
    4153     // interleave old gen and survivor spaces on top of NUMA
    4154     // allocation policy for the eden space.
    4155     // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
    4156     // all platforms and ParallelGC on Windows will interleave all
    4157     // of the heap spaces across NUMA nodes.
    4158     if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
    4159       FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
    4160     }
    4161   }
    4162   return JNI_OK;
    4163 }
    4164
    4165 int Arguments::PropertyList_count(SystemProperty* pl) {
    4166   int count = 0;
    4167   while(pl != NULL) {
    4168     count++;
    4169     pl = pl->next();
    4170   }
    4171   return count;
    4172 }
    4173
    4174 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
    4175   assert(key != NULL, "just checking");
    4176   SystemProperty* prop;
    4177   for (prop = pl; prop != NULL; prop = prop->next()) {
    4178     if (strcmp(key, prop->key()) == 0) return prop->value();
    4179   }
    4180   return NULL;
    4181 }
    4182
    4183 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
    4184   int count = 0;
    4185   const char* ret_val = NULL;
    4186
    4187   while(pl != NULL) {
    4188     if(count >= index) {
    4189       ret_val = pl->key();
    4190       break;
    4191     }
    4192     count++;
    4193     pl = pl->next();
    4194   }
    4195
    4196   return ret_val;
    4197 }
    4198
    4199 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
    4200   int count = 0;
    4201   char* ret_val = NULL;
    4202
    4203   while(pl != NULL) {
    4204     if(count >= index) {
    4205       ret_val = pl->value();
    4206       break;
    4207     }
    4208     count++;
    4209     pl = pl->next();
    4210   }
    4211
    4212   return ret_val;
    4213 }
    4214
    4215 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
    4216   SystemProperty* p = *plist;
    4217   if (p == NULL) {
    4218     *plist = new_p;
    4219   } else {
    4220     while (p->next() != NULL) {
    4221       p = p->next();
    4222     }
    4223     p->set_next(new_p);
    4224   }
    4225 }
    4226
    4227 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
    4228   if (plist == NULL)
    4229     return;
    4230
    4231   SystemProperty* new_p = new SystemProperty(k, v, true);
    4232   PropertyList_add(plist, new_p);
    4233 }
    4234
    4235 // This add maintains unique property key in the list.
    4236 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
    4237   if (plist == NULL)
    4238     return;
    4239
    4240   // If property key exist then update with new value.
    4241   SystemProperty* prop;
    4242   for (prop = *plist; prop != NULL; prop = prop->next()) {
    4243     if (strcmp(k, prop->key()) == 0) {
    4244       if (append) {
    4245         prop->append_value(v);
    4246       } else {
    4247         prop->set_value(v);
    4248       }
    4249       return;
    4250     }
    4251   }
    4252
    4253   PropertyList_add(plist, k, v);
    4254 }
    4255
    4256 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
    4257 // Returns true if all of the source pointed by src has been copied over to
    4258 // the destination buffer pointed by buf. Otherwise, returns false.
    4259 // Notes:
    4260 // 1. If the length (buflen) of the destination buffer excluding the
    4261 // NULL terminator character is not long enough for holding the expanded
    4262 // pid characters, it also returns false instead of returning the partially
    4263 // expanded one.
    4264 // 2. The passed in "buflen" should be large enough to hold the null terminator.
    4265 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
    4266                                 char* buf, size_t buflen) {
    4267   const char* p = src;
    4268   char* b = buf;
    4269   const char* src_end = &src[srclen];
    4270   char* buf_end = &buf[buflen - 1];
    4271
    4272   while (p < src_end && b < buf_end) {
    4273     if (*p == '%') {
    4274       switch (*(++p)) {
    4275       case '%':         // "%%" ==> "%"
    4276         *b++ = *p++;
    4277         break;
    4278       case 'p':  {       //  "%p" ==> current process id
    4279         // buf_end points to the character before the last character so
    4280         // that we could write '\0' to the end of the buffer.
    4281         size_t buf_sz = buf_end - b + 1;
    4282         int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
    4283
    4284         // if jio_snprintf fails or the buffer is not long enough to hold
    4285         // the expanded pid, returns false.
    4286         if (ret < 0 || ret >= (int)buf_sz) {
    4287           return false;
    4288         } else {
    4289           b += ret;
    4290           assert(*b == '\0', "fail in copy_expand_pid");
    4291           if (p == src_end && b == buf_end + 1) {
    4292             // reach the end of the buffer.
    4293             return true;
    4294           }
    4295         }
    4296         p++;
    4297         break;
    4298       }
    4299       default :
    4300         *b++ = '%';
    4301       }
    4302     } else {
    4303       *b++ = *p++;
    4304     }
    4305   }
    4306   *b = '\0';
    4307   return (p == src_end); // return false if not all of the source was copied
    4308 }