1 /*

     2  * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 # include "incls/_precompiled.incl"

    26 # include "incls/_universe.cpp.incl"

    27 

    28 // Known objects

    29 klassOop Universe::_boolArrayKlassObj                 = NULL;

    30 klassOop Universe::_byteArrayKlassObj                 = NULL;

    31 klassOop Universe::_charArrayKlassObj                 = NULL;

    32 klassOop Universe::_intArrayKlassObj                  = NULL;

    33 klassOop Universe::_shortArrayKlassObj                = NULL;

    34 klassOop Universe::_longArrayKlassObj                 = NULL;

    35 klassOop Universe::_singleArrayKlassObj               = NULL;

    36 klassOop Universe::_doubleArrayKlassObj               = NULL;

    37 klassOop Universe::_typeArrayKlassObjs[T_VOID+1]      = { NULL /*, NULL...*/ };

    38 klassOop Universe::_objectArrayKlassObj               = NULL;

    39 klassOop Universe::_symbolKlassObj                    = NULL;

    40 klassOop Universe::_methodKlassObj                    = NULL;

    41 klassOop Universe::_constMethodKlassObj               = NULL;

    42 klassOop Universe::_methodDataKlassObj                = NULL;

    43 klassOop Universe::_klassKlassObj                     = NULL;

    44 klassOop Universe::_arrayKlassKlassObj                = NULL;

    45 klassOop Universe::_objArrayKlassKlassObj             = NULL;

    46 klassOop Universe::_typeArrayKlassKlassObj            = NULL;

    47 klassOop Universe::_instanceKlassKlassObj             = NULL;

    48 klassOop Universe::_constantPoolKlassObj              = NULL;

    49 klassOop Universe::_constantPoolCacheKlassObj         = NULL;

    50 klassOop Universe::_compiledICHolderKlassObj          = NULL;

    51 klassOop Universe::_systemObjArrayKlassObj            = NULL;

    52 oop Universe::_int_mirror                             =  NULL;

    53 oop Universe::_float_mirror                           =  NULL;

    54 oop Universe::_double_mirror                          =  NULL;

    55 oop Universe::_byte_mirror                            =  NULL;

    56 oop Universe::_bool_mirror                            =  NULL;

    57 oop Universe::_char_mirror                            =  NULL;

    58 oop Universe::_long_mirror                            =  NULL;

    59 oop Universe::_short_mirror                           =  NULL;

    60 oop Universe::_void_mirror                            =  NULL;

    61 oop Universe::_mirrors[T_VOID+1]                      =  { NULL /*, NULL...*/ };

    62 oop Universe::_main_thread_group                      = NULL;

    63 oop Universe::_system_thread_group                    = NULL;

    64 typeArrayOop Universe::_the_empty_byte_array          = NULL;

    65 typeArrayOop Universe::_the_empty_short_array         = NULL;

    66 typeArrayOop Universe::_the_empty_int_array           = NULL;

    67 objArrayOop Universe::_the_empty_system_obj_array     = NULL;

    68 objArrayOop Universe::_the_empty_class_klass_array    = NULL;

    69 objArrayOop Universe::_the_array_interfaces_array     = NULL;

    70 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL;

    71 LatestMethodOopCache* Universe::_loader_addClass_cache    = NULL;

    72 ActiveMethodOopsCache* Universe::_reflect_invoke_cache    = NULL;

    73 oop Universe::_out_of_memory_error_java_heap          = NULL;

    74 oop Universe::_out_of_memory_error_perm_gen           = NULL;

    75 oop Universe::_out_of_memory_error_array_size         = NULL;

    76 oop Universe::_out_of_memory_error_gc_overhead_limit  = NULL;

    77 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;

    78 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;

    79 bool Universe::_verify_in_progress                    = false;

    80 oop Universe::_null_ptr_exception_instance            = NULL;

    81 oop Universe::_arithmetic_exception_instance          = NULL;

    82 oop Universe::_virtual_machine_error_instance         = NULL;

    83 oop Universe::_vm_exception                           = NULL;

    84 oop Universe::_emptySymbol                            = NULL;

    85 

    86 // These variables are guarded by FullGCALot_lock.

    87 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)

    88 debug_only(int Universe::_fullgc_alot_dummy_next      = 0;)

    89 

    90 

    91 // Heap

    92 int             Universe::_verify_count = 0;

    93 

    94 int             Universe::_base_vtable_size = 0;

    95 bool            Universe::_bootstrapping = false;

    96 bool            Universe::_fully_initialized = false;

    97 

    98 size_t          Universe::_heap_capacity_at_last_gc;

    99 size_t          Universe::_heap_used_at_last_gc;

   100 

   101 CollectedHeap*  Universe::_collectedHeap = NULL;

   102 

   103 

   104 void Universe::basic_type_classes_do(void f(klassOop)) {

   105   f(boolArrayKlassObj());

   106   f(byteArrayKlassObj());

   107   f(charArrayKlassObj());

   108   f(intArrayKlassObj());

   109   f(shortArrayKlassObj());

   110   f(longArrayKlassObj());

   111   f(singleArrayKlassObj());

   112   f(doubleArrayKlassObj());

   113 }

   114 

   115 

   116 void Universe::system_classes_do(void f(klassOop)) {

   117   f(symbolKlassObj());

   118   f(methodKlassObj());

   119   f(constMethodKlassObj());

   120   f(methodDataKlassObj());

   121   f(klassKlassObj());

   122   f(arrayKlassKlassObj());

   123   f(objArrayKlassKlassObj());

   124   f(typeArrayKlassKlassObj());

   125   f(instanceKlassKlassObj());

   126   f(constantPoolKlassObj());

   127   f(systemObjArrayKlassObj());

   128 }

   129 

   130 void Universe::oops_do(OopClosure* f, bool do_all) {

   131 

   132   f->do_oop((oop*) &_int_mirror);

   133   f->do_oop((oop*) &_float_mirror);

   134   f->do_oop((oop*) &_double_mirror);

   135   f->do_oop((oop*) &_byte_mirror);

   136   f->do_oop((oop*) &_bool_mirror);

   137   f->do_oop((oop*) &_char_mirror);

   138   f->do_oop((oop*) &_long_mirror);

   139   f->do_oop((oop*) &_short_mirror);

   140   f->do_oop((oop*) &_void_mirror);

   141 

   142   // It's important to iterate over these guys even if they are null,

   143   // since that's how shared heaps are restored.

   144   for (int i = T_BOOLEAN; i < T_VOID+1; i++) {

   145     f->do_oop((oop*) &_mirrors[i]);

   146   }

   147   assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");

   148 

   149   // %%% Consider moving those "shared oops" over here with the others.

   150   f->do_oop((oop*)&_boolArrayKlassObj);

   151   f->do_oop((oop*)&_byteArrayKlassObj);

   152   f->do_oop((oop*)&_charArrayKlassObj);

   153   f->do_oop((oop*)&_intArrayKlassObj);

   154   f->do_oop((oop*)&_shortArrayKlassObj);

   155   f->do_oop((oop*)&_longArrayKlassObj);

   156   f->do_oop((oop*)&_singleArrayKlassObj);

   157   f->do_oop((oop*)&_doubleArrayKlassObj);

   158   f->do_oop((oop*)&_objectArrayKlassObj);

   159   {

   160     for (int i = 0; i < T_VOID+1; i++) {

   161       if (_typeArrayKlassObjs[i] != NULL) {

   162         assert(i >= T_BOOLEAN, "checking");

   163         f->do_oop((oop*)&_typeArrayKlassObjs[i]);

   164       } else if (do_all) {

   165         f->do_oop((oop*)&_typeArrayKlassObjs[i]);

   166       }

   167     }

   168   }

   169   f->do_oop((oop*)&_symbolKlassObj);

   170   f->do_oop((oop*)&_methodKlassObj);

   171   f->do_oop((oop*)&_constMethodKlassObj);

   172   f->do_oop((oop*)&_methodDataKlassObj);

   173   f->do_oop((oop*)&_klassKlassObj);

   174   f->do_oop((oop*)&_arrayKlassKlassObj);

   175   f->do_oop((oop*)&_objArrayKlassKlassObj);

   176   f->do_oop((oop*)&_typeArrayKlassKlassObj);

   177   f->do_oop((oop*)&_instanceKlassKlassObj);

   178   f->do_oop((oop*)&_constantPoolKlassObj);

   179   f->do_oop((oop*)&_constantPoolCacheKlassObj);

   180   f->do_oop((oop*)&_compiledICHolderKlassObj);

   181   f->do_oop((oop*)&_systemObjArrayKlassObj);

   182   f->do_oop((oop*)&_the_empty_byte_array);

   183   f->do_oop((oop*)&_the_empty_short_array);

   184   f->do_oop((oop*)&_the_empty_int_array);

   185   f->do_oop((oop*)&_the_empty_system_obj_array);

   186   f->do_oop((oop*)&_the_empty_class_klass_array);

   187   f->do_oop((oop*)&_the_array_interfaces_array);

   188   _finalizer_register_cache->oops_do(f);

   189   _loader_addClass_cache->oops_do(f);

   190   _reflect_invoke_cache->oops_do(f);

   191   f->do_oop((oop*)&_out_of_memory_error_java_heap);

   192   f->do_oop((oop*)&_out_of_memory_error_perm_gen);

   193   f->do_oop((oop*)&_out_of_memory_error_array_size);

   194   f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);

   195   if (_preallocated_out_of_memory_error_array != (oop)NULL) {   // NULL when DumpSharedSpaces

   196     f->do_oop((oop*)&_preallocated_out_of_memory_error_array);

   197   }

   198   f->do_oop((oop*)&_null_ptr_exception_instance);

   199   f->do_oop((oop*)&_arithmetic_exception_instance);

   200   f->do_oop((oop*)&_virtual_machine_error_instance);

   201   f->do_oop((oop*)&_main_thread_group);

   202   f->do_oop((oop*)&_system_thread_group);

   203   f->do_oop((oop*)&_vm_exception);

   204   f->do_oop((oop*)&_emptySymbol);

   205   debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)

   206 }

   207 

   208 

   209 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {

   210   if (size < alignment || size % alignment != 0) {

   211     ResourceMark rm;

   212     stringStream st;

   213     st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment);

   214     char* error = st.as_string();

   215     vm_exit_during_initialization(error);

   216   }

   217 }

   218 

   219 

   220 void Universe::genesis(TRAPS) {

   221   ResourceMark rm;

   222   { FlagSetting fs(_bootstrapping, true);

   223 

   224     { MutexLocker mc(Compile_lock);

   225 

   226       // determine base vtable size; without that we cannot create the array klasses

   227       compute_base_vtable_size();

   228 

   229       if (!UseSharedSpaces) {

   230         _klassKlassObj          = klassKlass::create_klass(CHECK);

   231         _arrayKlassKlassObj     = arrayKlassKlass::create_klass(CHECK);

   232 

   233         _objArrayKlassKlassObj  = objArrayKlassKlass::create_klass(CHECK);

   234         _instanceKlassKlassObj  = instanceKlassKlass::create_klass(CHECK);

   235         _typeArrayKlassKlassObj = typeArrayKlassKlass::create_klass(CHECK);

   236 

   237         _symbolKlassObj         = symbolKlass::create_klass(CHECK);

   238 

   239         _emptySymbol            = oopFactory::new_symbol("", CHECK);

   240 

   241         _boolArrayKlassObj      = typeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);

   242         _charArrayKlassObj      = typeArrayKlass::create_klass(T_CHAR,    sizeof(jchar),    CHECK);

   243         _singleArrayKlassObj    = typeArrayKlass::create_klass(T_FLOAT,   sizeof(jfloat),   CHECK);

   244         _doubleArrayKlassObj    = typeArrayKlass::create_klass(T_DOUBLE,  sizeof(jdouble),  CHECK);

   245         _byteArrayKlassObj      = typeArrayKlass::create_klass(T_BYTE,    sizeof(jbyte),    CHECK);

   246         _shortArrayKlassObj     = typeArrayKlass::create_klass(T_SHORT,   sizeof(jshort),   CHECK);

   247         _intArrayKlassObj       = typeArrayKlass::create_klass(T_INT,     sizeof(jint),     CHECK);

   248         _longArrayKlassObj      = typeArrayKlass::create_klass(T_LONG,    sizeof(jlong),    CHECK);

   249 

   250         _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;

   251         _typeArrayKlassObjs[T_CHAR]    = _charArrayKlassObj;

   252         _typeArrayKlassObjs[T_FLOAT]   = _singleArrayKlassObj;

   253         _typeArrayKlassObjs[T_DOUBLE]  = _doubleArrayKlassObj;

   254         _typeArrayKlassObjs[T_BYTE]    = _byteArrayKlassObj;

   255         _typeArrayKlassObjs[T_SHORT]   = _shortArrayKlassObj;

   256         _typeArrayKlassObjs[T_INT]     = _intArrayKlassObj;

   257         _typeArrayKlassObjs[T_LONG]    = _longArrayKlassObj;

   258 

   259         _methodKlassObj         = methodKlass::create_klass(CHECK);

   260         _constMethodKlassObj    = constMethodKlass::create_klass(CHECK);

   261         _methodDataKlassObj     = methodDataKlass::create_klass(CHECK);

   262         _constantPoolKlassObj       = constantPoolKlass::create_klass(CHECK);

   263         _constantPoolCacheKlassObj  = constantPoolCacheKlass::create_klass(CHECK);

   264 

   265         _compiledICHolderKlassObj   = compiledICHolderKlass::create_klass(CHECK);

   266         _systemObjArrayKlassObj     = objArrayKlassKlass::cast(objArrayKlassKlassObj())->allocate_system_objArray_klass(CHECK);

   267 

   268         _the_empty_byte_array      = oopFactory::new_permanent_byteArray(0, CHECK);

   269         _the_empty_short_array      = oopFactory::new_permanent_shortArray(0, CHECK);

   270         _the_empty_int_array        = oopFactory::new_permanent_intArray(0, CHECK);

   271         _the_empty_system_obj_array = oopFactory::new_system_objArray(0, CHECK);

   272 

   273         _the_array_interfaces_array = oopFactory::new_system_objArray(2, CHECK);

   274         _vm_exception               = oopFactory::new_symbol("vm exception holder", CHECK);

   275       } else {

   276 

   277         FileMapInfo *mapinfo = FileMapInfo::current_info();

   278         char* buffer = mapinfo->region_base(CompactingPermGenGen::md);

   279         void** vtbl_list = (void**)buffer;

   280         init_self_patching_vtbl_list(vtbl_list,

   281                                      CompactingPermGenGen::vtbl_list_size);

   282       }

   283     }

   284 

   285     vmSymbols::initialize(CHECK);

   286 

   287     SystemDictionary::initialize(CHECK);

   288 

   289     klassOop ok = SystemDictionary::object_klass();

   290 

   291     if (UseSharedSpaces) {

   292       // Verify shared interfaces array.

   293       assert(_the_array_interfaces_array->obj_at(0) ==

   294              SystemDictionary::cloneable_klass(), "u3");

   295       assert(_the_array_interfaces_array->obj_at(1) ==

   296              SystemDictionary::serializable_klass(), "u3");

   297 

   298       // Verify element klass for system obj array klass

   299       assert(objArrayKlass::cast(_systemObjArrayKlassObj)->element_klass() == ok, "u1");

   300       assert(objArrayKlass::cast(_systemObjArrayKlassObj)->bottom_klass() == ok, "u2");

   301 

   302       // Verify super class for the classes created above

   303       assert(Klass::cast(boolArrayKlassObj()     )->super() == ok, "u3");

   304       assert(Klass::cast(charArrayKlassObj()     )->super() == ok, "u3");

   305       assert(Klass::cast(singleArrayKlassObj()   )->super() == ok, "u3");

   306       assert(Klass::cast(doubleArrayKlassObj()   )->super() == ok, "u3");

   307       assert(Klass::cast(byteArrayKlassObj()     )->super() == ok, "u3");

   308       assert(Klass::cast(shortArrayKlassObj()    )->super() == ok, "u3");

   309       assert(Klass::cast(intArrayKlassObj()      )->super() == ok, "u3");

   310       assert(Klass::cast(longArrayKlassObj()     )->super() == ok, "u3");

   311       assert(Klass::cast(constantPoolKlassObj()  )->super() == ok, "u3");

   312       assert(Klass::cast(systemObjArrayKlassObj())->super() == ok, "u3");

   313     } else {

   314       // Set up shared interfaces array.  (Do this before supers are set up.)

   315       _the_array_interfaces_array->obj_at_put(0, SystemDictionary::cloneable_klass());

   316       _the_array_interfaces_array->obj_at_put(1, SystemDictionary::serializable_klass());

   317 

   318       // Set element klass for system obj array klass

   319       objArrayKlass::cast(_systemObjArrayKlassObj)->set_element_klass(ok);

   320       objArrayKlass::cast(_systemObjArrayKlassObj)->set_bottom_klass(ok);

   321 

   322       // Set super class for the classes created above

   323       Klass::cast(boolArrayKlassObj()     )->initialize_supers(ok, CHECK);

   324       Klass::cast(charArrayKlassObj()     )->initialize_supers(ok, CHECK);

   325       Klass::cast(singleArrayKlassObj()   )->initialize_supers(ok, CHECK);

   326       Klass::cast(doubleArrayKlassObj()   )->initialize_supers(ok, CHECK);

   327       Klass::cast(byteArrayKlassObj()     )->initialize_supers(ok, CHECK);

   328       Klass::cast(shortArrayKlassObj()    )->initialize_supers(ok, CHECK);

   329       Klass::cast(intArrayKlassObj()      )->initialize_supers(ok, CHECK);

   330       Klass::cast(longArrayKlassObj()     )->initialize_supers(ok, CHECK);

   331       Klass::cast(constantPoolKlassObj()  )->initialize_supers(ok, CHECK);

   332       Klass::cast(systemObjArrayKlassObj())->initialize_supers(ok, CHECK);

   333       Klass::cast(boolArrayKlassObj()     )->set_super(ok);

   334       Klass::cast(charArrayKlassObj()     )->set_super(ok);

   335       Klass::cast(singleArrayKlassObj()   )->set_super(ok);

   336       Klass::cast(doubleArrayKlassObj()   )->set_super(ok);

   337       Klass::cast(byteArrayKlassObj()     )->set_super(ok);

   338       Klass::cast(shortArrayKlassObj()    )->set_super(ok);

   339       Klass::cast(intArrayKlassObj()      )->set_super(ok);

   340       Klass::cast(longArrayKlassObj()     )->set_super(ok);

   341       Klass::cast(constantPoolKlassObj()  )->set_super(ok);

   342       Klass::cast(systemObjArrayKlassObj())->set_super(ok);

   343     }

   344 

   345     Klass::cast(boolArrayKlassObj()     )->append_to_sibling_list();

   346     Klass::cast(charArrayKlassObj()     )->append_to_sibling_list();

   347     Klass::cast(singleArrayKlassObj()   )->append_to_sibling_list();

   348     Klass::cast(doubleArrayKlassObj()   )->append_to_sibling_list();

   349     Klass::cast(byteArrayKlassObj()     )->append_to_sibling_list();

   350     Klass::cast(shortArrayKlassObj()    )->append_to_sibling_list();

   351     Klass::cast(intArrayKlassObj()      )->append_to_sibling_list();

   352     Klass::cast(longArrayKlassObj()     )->append_to_sibling_list();

   353     Klass::cast(constantPoolKlassObj()  )->append_to_sibling_list();

   354     Klass::cast(systemObjArrayKlassObj())->append_to_sibling_list();

   355   } // end of core bootstrapping

   356 

   357   // Initialize _objectArrayKlass after core bootstraping to make

   358   // sure the super class is set up properly for _objectArrayKlass.

   359   _objectArrayKlassObj = instanceKlass::

   360     cast(SystemDictionary::object_klass())->array_klass(1, CHECK);

   361   // Add the class to the class hierarchy manually to make sure that

   362   // its vtable is initialized after core bootstrapping is completed.

   363   Klass::cast(_objectArrayKlassObj)->append_to_sibling_list();

   364 

   365   // Compute is_jdk version flags.

   366   // Only 1.3 or later has the java.lang.Shutdown class.

   367   // Only 1.4 or later has the java.lang.CharSequence interface.

   368   // Only 1.5 or later has the java.lang.management.MemoryUsage class.

   369   if (JDK_Version::is_pre_jdk16_version()) {

   370     klassOop k = SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_management_MemoryUsage(), THREAD);

   371     CLEAR_PENDING_EXCEPTION; // ignore exceptions

   372     if (k == NULL) {

   373       k = SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_CharSequence(), THREAD);

   374       CLEAR_PENDING_EXCEPTION; // ignore exceptions

   375       if (k == NULL) {

   376         k = SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_Shutdown(), THREAD);

   377         CLEAR_PENDING_EXCEPTION; // ignore exceptions

   378         if (k == NULL) {

   379           JDK_Version::set_jdk12x_version();

   380         } else {

   381           JDK_Version::set_jdk13x_version();

   382         }

   383       } else {

   384           JDK_Version::set_jdk14x_version();

   385       }

   386     } else {

   387           JDK_Version::set_jdk15x_version();

   388     }

   389   }

   390 

   391   #ifdef ASSERT

   392   if (FullGCALot) {

   393     // Allocate an array of dummy objects.

   394     // We'd like these to be at the bottom of the old generation,

   395     // so that when we free one and then collect,

   396     // (almost) the whole heap moves

   397     // and we find out if we actually update all the oops correctly.

   398     // But we can't allocate directly in the old generation,

   399     // so we allocate wherever, and hope that the first collection

   400     // moves these objects to the bottom of the old generation.

   401     // We can allocate directly in the permanent generation, so we do.

   402     int size;

   403     if (UseConcMarkSweepGC) {

   404       warning("Using +FullGCALot with concurrent mark sweep gc "

   405               "will not force all objects to relocate");

   406       size = FullGCALotDummies;

   407     } else {

   408       size = FullGCALotDummies * 2;

   409     }

   410     objArrayOop    naked_array = oopFactory::new_system_objArray(size, CHECK);

   411     objArrayHandle dummy_array(THREAD, naked_array);

   412     int i = 0;

   413     while (i < size) {

   414       if (!UseConcMarkSweepGC) {

   415         // Allocate dummy in old generation

   416         oop dummy = instanceKlass::cast(SystemDictionary::object_klass())->allocate_instance(CHECK);

   417         dummy_array->obj_at_put(i++, dummy);

   418       }

   419       // Allocate dummy in permanent generation

   420       oop dummy = instanceKlass::cast(SystemDictionary::object_klass())->allocate_permanent_instance(CHECK);

   421       dummy_array->obj_at_put(i++, dummy);

   422     }

   423     {

   424       // Only modify the global variable inside the mutex.

   425       // If we had a race to here, the other dummy_array instances

   426       // and their elements just get dropped on the floor, which is fine.

   427       MutexLocker ml(FullGCALot_lock);

   428       if (_fullgc_alot_dummy_array == NULL) {

   429         _fullgc_alot_dummy_array = dummy_array();

   430       }

   431     }

   432     assert(i == _fullgc_alot_dummy_array->length(), "just checking");

   433   }

   434   #endif

   435 }

   436 

   437 

   438 static inline void add_vtable(void** list, int* n, Klass* o, int count) {

   439   list[(*n)++] = *(void**)&o->vtbl_value();

   440   guarantee((*n) <= count, "vtable list too small.");

   441 }

   442 

   443 

   444 void Universe::init_self_patching_vtbl_list(void** list, int count) {

   445   int n = 0;

   446   { klassKlass o;             add_vtable(list, &n, &o, count); }

   447   { arrayKlassKlass o;        add_vtable(list, &n, &o, count); }

   448   { objArrayKlassKlass o;     add_vtable(list, &n, &o, count); }

   449   { instanceKlassKlass o;     add_vtable(list, &n, &o, count); }

   450   { instanceKlass o;          add_vtable(list, &n, &o, count); }

   451   { instanceRefKlass o;       add_vtable(list, &n, &o, count); }

   452   { typeArrayKlassKlass o;    add_vtable(list, &n, &o, count); }

   453   { symbolKlass o;            add_vtable(list, &n, &o, count); }

   454   { typeArrayKlass o;         add_vtable(list, &n, &o, count); }

   455   { methodKlass o;            add_vtable(list, &n, &o, count); }

   456   { constMethodKlass o;       add_vtable(list, &n, &o, count); }

   457   { constantPoolKlass o;      add_vtable(list, &n, &o, count); }

   458   { constantPoolCacheKlass o; add_vtable(list, &n, &o, count); }

   459   { objArrayKlass o;          add_vtable(list, &n, &o, count); }

   460   { methodDataKlass o;        add_vtable(list, &n, &o, count); }

   461   { compiledICHolderKlass o;  add_vtable(list, &n, &o, count); }

   462 }

   463 

   464 

   465 class FixupMirrorClosure: public ObjectClosure {

   466  public:

   467   void do_object(oop obj) {

   468     if (obj->is_klass()) {

   469       EXCEPTION_MARK;

   470       KlassHandle k(THREAD, klassOop(obj));

   471       // We will never reach the CATCH below since Exceptions::_throw will cause

   472       // the VM to exit if an exception is thrown during initialization

   473       java_lang_Class::create_mirror(k, CATCH);

   474       // This call unconditionally creates a new mirror for k,

   475       // and links in k's component_mirror field if k is an array.

   476       // If k is an objArray, k's element type must already have

   477       // a mirror.  In other words, this closure must process

   478       // the component type of an objArray k before it processes k.

   479       // This works because the permgen iterator presents arrays

   480       // and their component types in order of creation.

   481     }

   482   }

   483 };

   484 

   485 void Universe::initialize_basic_type_mirrors(TRAPS) {

   486   if (UseSharedSpaces) {

   487     assert(_int_mirror != NULL, "already loaded");

   488     assert(_void_mirror == _mirrors[T_VOID], "consistently loaded");

   489   } else {

   490 

   491     assert(_int_mirror==NULL, "basic type mirrors already initialized");

   492     _int_mirror     =

   493       java_lang_Class::create_basic_type_mirror("int",    T_INT, CHECK);

   494     _float_mirror   =

   495       java_lang_Class::create_basic_type_mirror("float",  T_FLOAT,   CHECK);

   496     _double_mirror  =

   497       java_lang_Class::create_basic_type_mirror("double", T_DOUBLE,  CHECK);

   498     _byte_mirror    =

   499       java_lang_Class::create_basic_type_mirror("byte",   T_BYTE, CHECK);

   500     _bool_mirror    =

   501       java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);

   502     _char_mirror    =

   503       java_lang_Class::create_basic_type_mirror("char",   T_CHAR, CHECK);

   504     _long_mirror    =

   505       java_lang_Class::create_basic_type_mirror("long",   T_LONG, CHECK);

   506     _short_mirror   =

   507       java_lang_Class::create_basic_type_mirror("short",  T_SHORT,   CHECK);

   508     _void_mirror    =

   509       java_lang_Class::create_basic_type_mirror("void",   T_VOID, CHECK);

   510 

   511     _mirrors[T_INT]     = _int_mirror;

   512     _mirrors[T_FLOAT]   = _float_mirror;

   513     _mirrors[T_DOUBLE]  = _double_mirror;

   514     _mirrors[T_BYTE]    = _byte_mirror;

   515     _mirrors[T_BOOLEAN] = _bool_mirror;

   516     _mirrors[T_CHAR]    = _char_mirror;

   517     _mirrors[T_LONG]    = _long_mirror;

   518     _mirrors[T_SHORT]   = _short_mirror;

   519     _mirrors[T_VOID]    = _void_mirror;

   520     //_mirrors[T_OBJECT]  = instanceKlass::cast(_object_klass)->java_mirror();

   521     //_mirrors[T_ARRAY]   = instanceKlass::cast(_object_klass)->java_mirror();

   522   }

   523 }

   524 

   525 void Universe::fixup_mirrors(TRAPS) {

   526   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,

   527   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply

   528   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note

   529   // that the number of objects allocated at this point is very small.

   530   assert(SystemDictionary::class_klass_loaded(), "java.lang.Class should be loaded");

   531   FixupMirrorClosure blk;

   532   Universe::heap()->permanent_object_iterate(&blk);

   533 }

   534 

   535 

   536 static bool has_run_finalizers_on_exit = false;

   537 

   538 void Universe::run_finalizers_on_exit() {

   539   if (has_run_finalizers_on_exit) return;

   540   has_run_finalizers_on_exit = true;

   541 

   542   // Called on VM exit. This ought to be run in a separate thread.

   543   if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit");

   544   {

   545     PRESERVE_EXCEPTION_MARK;

   546     KlassHandle finalizer_klass(THREAD, SystemDictionary::finalizer_klass());

   547     JavaValue result(T_VOID);

   548     JavaCalls::call_static(

   549       &result,

   550       finalizer_klass,

   551       vmSymbolHandles::run_finalizers_on_exit_name(),

   552       vmSymbolHandles::void_method_signature(),

   553       THREAD

   554     );

   555     // Ignore any pending exceptions

   556     CLEAR_PENDING_EXCEPTION;

   557   }

   558 }

   559 

   560 

   561 // initialize_vtable could cause gc if

   562 // 1) we specified true to initialize_vtable and

   563 // 2) this ran after gc was enabled

   564 // In case those ever change we use handles for oops

   565 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {

   566   // init vtable of k and all subclasses

   567   Klass* ko = k_h()->klass_part();

   568   klassVtable* vt = ko->vtable();

   569   if (vt) vt->initialize_vtable(false, CHECK);

   570   if (ko->oop_is_instance()) {

   571     instanceKlass* ik = (instanceKlass*)ko;

   572     for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->klass_part()->next_sibling())) {

   573       reinitialize_vtable_of(s_h, CHECK);

   574     }

   575   }

   576 }

   577 

   578 

   579 void initialize_itable_for_klass(klassOop k, TRAPS) {

   580   instanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);

   581 }

   582 

   583 

   584 void Universe::reinitialize_itables(TRAPS) {

   585   SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);

   586 

   587 }

   588 

   589 

   590 bool Universe::on_page_boundary(void* addr) {

   591   return ((uintptr_t) addr) % os::vm_page_size() == 0;

   592 }

   593 

   594 

   595 bool Universe::should_fill_in_stack_trace(Handle throwable) {

   596   // never attempt to fill in the stack trace of preallocated errors that do not have

   597   // backtrace. These errors are kept alive forever and may be "re-used" when all

   598   // preallocated errors with backtrace have been consumed. Also need to avoid

   599   // a potential loop which could happen if an out of memory occurs when attempting

   600   // to allocate the backtrace.

   601   return ((throwable() != Universe::_out_of_memory_error_java_heap) &&

   602           (throwable() != Universe::_out_of_memory_error_perm_gen)  &&

   603           (throwable() != Universe::_out_of_memory_error_array_size) &&

   604           (throwable() != Universe::_out_of_memory_error_gc_overhead_limit));

   605 }

   606 

   607 

   608 oop Universe::gen_out_of_memory_error(oop default_err) {

   609   // generate an out of memory error:

   610   // - if there is a preallocated error with backtrace available then return it wth

   611   //   a filled in stack trace.

   612   // - if there are no preallocated errors with backtrace available then return

   613   //   an error without backtrace.

   614   int next;

   615   if (_preallocated_out_of_memory_error_avail_count > 0) {

   616     next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);

   617     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");

   618   } else {

   619     next = -1;

   620   }

   621   if (next < 0) {

   622     // all preallocated errors have been used.

   623     // return default

   624     return default_err;

   625   } else {

   626     // get the error object at the slot and set set it to NULL so that the

   627     // array isn't keeping it alive anymore.

   628     oop exc = preallocated_out_of_memory_errors()->obj_at(next);

   629     assert(exc != NULL, "slot has been used already");

   630     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);

   631 

   632     // use the message from the default error

   633     oop msg = java_lang_Throwable::message(default_err);

   634     assert(msg != NULL, "no message");

   635     java_lang_Throwable::set_message(exc, msg);

   636 

   637     // populate the stack trace and return it.

   638     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);

   639     return exc;

   640   }

   641 }

   642 

   643 static intptr_t non_oop_bits = 0;

   644 

   645 void* Universe::non_oop_word() {

   646   // Neither the high bits nor the low bits of this value is allowed

   647   // to look like (respectively) the high or low bits of a real oop.

   648   //

   649   // High and low are CPU-specific notions, but low always includes

   650   // the low-order bit.  Since oops are always aligned at least mod 4,

   651   // setting the low-order bit will ensure that the low half of the

   652   // word will never look like that of a real oop.

   653   //

   654   // Using the OS-supplied non-memory-address word (usually 0 or -1)

   655   // will take care of the high bits, however many there are.

   656 

   657   if (non_oop_bits == 0) {

   658     non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;

   659   }

   660 

   661   return (void*)non_oop_bits;

   662 }

   663 

   664 jint universe_init() {

   665   assert(!Universe::_fully_initialized, "called after initialize_vtables");

   666   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),

   667          "LogHeapWordSize is incorrect.");

   668   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");

   669   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,

   670          "oop size is not not a multiple of HeapWord size");

   671   TraceTime timer("Genesis", TraceStartupTime);

   672   GC_locker::lock();  // do not allow gc during bootstrapping

   673   JavaClasses::compute_hard_coded_offsets();

   674 

   675   // Get map info from shared archive file.

   676   if (DumpSharedSpaces)

   677     UseSharedSpaces = false;

   678 

   679   FileMapInfo* mapinfo = NULL;

   680   if (UseSharedSpaces) {

   681     mapinfo = NEW_C_HEAP_OBJ(FileMapInfo);

   682     memset(mapinfo, 0, sizeof(FileMapInfo));

   683 

   684     // Open the shared archive file, read and validate the header. If

   685     // initialization files, shared spaces [UseSharedSpaces] are

   686     // disabled and the file is closed.

   687 

   688     if (mapinfo->initialize()) {

   689       FileMapInfo::set_current_info(mapinfo);

   690     } else {

   691       assert(!mapinfo->is_open() && !UseSharedSpaces,

   692              "archive file not closed or shared spaces not disabled.");

   693     }

   694   }

   695 

   696   jint status = Universe::initialize_heap();

   697   if (status != JNI_OK) {

   698     return status;

   699   }

   700 

   701   // We have a heap so create the methodOop caches before

   702   // CompactingPermGenGen::initialize_oops() tries to populate them.

   703   Universe::_finalizer_register_cache = new LatestMethodOopCache();

   704   Universe::_loader_addClass_cache    = new LatestMethodOopCache();

   705   Universe::_reflect_invoke_cache     = new ActiveMethodOopsCache();

   706 

   707   if (UseSharedSpaces) {

   708 

   709     // Read the data structures supporting the shared spaces (shared

   710     // system dictionary, symbol table, etc.).  After that, access to

   711     // the file (other than the mapped regions) is no longer needed, and

   712     // the file is closed. Closing the file does not affect the

   713     // currently mapped regions.

   714 

   715     CompactingPermGenGen::initialize_oops();

   716     mapinfo->close();

   717 

   718   } else {

   719     SymbolTable::create_table();

   720     StringTable::create_table();

   721     ClassLoader::create_package_info_table();

   722   }

   723 

   724   return JNI_OK;

   725 }

   726 

   727 jint Universe::initialize_heap() {

   728 

   729   if (UseParallelGC) {

   730 #ifndef SERIALGC

   731     Universe::_collectedHeap = new ParallelScavengeHeap();

   732 #else  // SERIALGC

   733     fatal("UseParallelGC not supported in java kernel vm.");

   734 #endif // SERIALGC

   735 

   736   } else {

   737     GenCollectorPolicy *gc_policy;

   738 

   739     if (UseSerialGC) {

   740       gc_policy = new MarkSweepPolicy();

   741     } else if (UseConcMarkSweepGC) {

   742 #ifndef SERIALGC

   743       if (UseAdaptiveSizePolicy) {

   744         gc_policy = new ASConcurrentMarkSweepPolicy();

   745       } else {

   746         gc_policy = new ConcurrentMarkSweepPolicy();

   747       }

   748 #else   // SERIALGC

   749     fatal("UseConcMarkSweepGC not supported in java kernel vm.");

   750 #endif // SERIALGC

   751     } else { // default old generation

   752       gc_policy = new MarkSweepPolicy();

   753     }

   754 

   755     Universe::_collectedHeap = new GenCollectedHeap(gc_policy);

   756   }

   757 

   758   jint status = Universe::heap()->initialize();

   759   if (status != JNI_OK) {

   760     return status;

   761   }

   762 

   763   // We will never reach the CATCH below since Exceptions::_throw will cause

   764   // the VM to exit if an exception is thrown during initialization

   765 

   766   if (UseTLAB) {

   767     assert(Universe::heap()->supports_tlab_allocation(),

   768            "Should support thread-local allocation buffers");

   769     ThreadLocalAllocBuffer::startup_initialization();

   770   }

   771   return JNI_OK;

   772 }

   773 

   774 // It's the caller's repsonsibility to ensure glitch-freedom

   775 // (if required).

   776 void Universe::update_heap_info_at_gc() {

   777   _heap_capacity_at_last_gc = heap()->capacity();

   778   _heap_used_at_last_gc     = heap()->used();

   779 }

   780 

   781 

   782 

   783 void universe2_init() {

   784   EXCEPTION_MARK;

   785   Universe::genesis(CATCH);

   786   // Although we'd like to verify here that the state of the heap

   787   // is good, we can't because the main thread has not yet added

   788   // itself to the threads list (so, using current interfaces

   789   // we can't "fill" its TLAB), unless TLABs are disabled.

   790   if (VerifyBeforeGC && !UseTLAB &&

   791       Universe::heap()->total_collections() >= VerifyGCStartAt) {

   792      Universe::heap()->prepare_for_verify();

   793      Universe::verify();   // make sure we're starting with a clean slate

   794   }

   795 }

   796 

   797 

   798 // This function is defined in JVM.cpp

   799 extern void initialize_converter_functions();

   800 

   801 bool universe_post_init() {

   802   Universe::_fully_initialized = true;

   803   EXCEPTION_MARK;

   804   { ResourceMark rm;

   805     Interpreter::initialize();      // needed for interpreter entry points

   806     if (!UseSharedSpaces) {

   807       KlassHandle ok_h(THREAD, SystemDictionary::object_klass());

   808       Universe::reinitialize_vtable_of(ok_h, CHECK_false);

   809       Universe::reinitialize_itables(CHECK_false);

   810     }

   811   }

   812 

   813   klassOop k;

   814   instanceKlassHandle k_h;

   815   if (!UseSharedSpaces) {

   816     // Setup preallocated empty java.lang.Class array

   817     Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::class_klass(), 0, CHECK_false);

   818     // Setup preallocated OutOfMemoryError errors

   819     k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK_false);

   820     k_h = instanceKlassHandle(THREAD, k);

   821     Universe::_out_of_memory_error_java_heap = k_h->allocate_permanent_instance(CHECK_false);

   822     Universe::_out_of_memory_error_perm_gen = k_h->allocate_permanent_instance(CHECK_false);

   823     Universe::_out_of_memory_error_array_size = k_h->allocate_permanent_instance(CHECK_false);

   824     Universe::_out_of_memory_error_gc_overhead_limit =

   825       k_h->allocate_permanent_instance(CHECK_false);

   826 

   827     // Setup preallocated NullPointerException

   828     // (this is currently used for a cheap & dirty solution in compiler exception handling)

   829     k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_NullPointerException(), true, CHECK_false);

   830     Universe::_null_ptr_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false);

   831     // Setup preallocated ArithmeticException

   832     // (this is currently used for a cheap & dirty solution in compiler exception handling)

   833     k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ArithmeticException(), true, CHECK_false);

   834     Universe::_arithmetic_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false);

   835     // Virtual Machine Error for when we get into a situation we can't resolve

   836     k = SystemDictionary::resolve_or_fail(

   837       vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK_false);

   838     bool linked = instanceKlass::cast(k)->link_class_or_fail(CHECK_false);

   839     if (!linked) {

   840       tty->print_cr("Unable to link/verify VirtualMachineError class");

   841       return false; // initialization failed

   842     }

   843     Universe::_virtual_machine_error_instance =

   844       instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false);

   845   }

   846   if (!DumpSharedSpaces) {

   847     // These are the only Java fields that are currently set during shared space dumping.

   848     // We prefer to not handle this generally, so we always reinitialize these detail messages.

   849     Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);

   850     java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());

   851 

   852     msg = java_lang_String::create_from_str("PermGen space", CHECK_false);

   853     java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg());

   854 

   855     msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);

   856     java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());

   857 

   858     msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);

   859     java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());

   860 

   861     msg = java_lang_String::create_from_str("/ by zero", CHECK_false);

   862     java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());

   863 

   864     // Setup the array of errors that have preallocated backtrace

   865     k = Universe::_out_of_memory_error_java_heap->klass();

   866     assert(k->klass_part()->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");

   867     k_h = instanceKlassHandle(THREAD, k);

   868 

   869     int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;

   870     Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);

   871     for (int i=0; i<len; i++) {

   872       oop err = k_h->allocate_permanent_instance(CHECK_false);

   873       Handle err_h = Handle(THREAD, err);

   874       java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);

   875       Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());

   876     }

   877     Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;

   878   }

   879 

   880 

   881   // Setup static method for registering finalizers

   882   // The finalizer klass must be linked before looking up the method, in

   883   // case it needs to get rewritten.

   884   instanceKlass::cast(SystemDictionary::finalizer_klass())->link_class(CHECK_false);

   885   methodOop m = instanceKlass::cast(SystemDictionary::finalizer_klass())->find_method(

   886                                   vmSymbols::register_method_name(),

   887                                   vmSymbols::register_method_signature());

   888   if (m == NULL || !m->is_static()) {

   889     THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(),

   890       "java.lang.ref.Finalizer.register", false);

   891   }

   892   Universe::_finalizer_register_cache->init(

   893     SystemDictionary::finalizer_klass(), m, CHECK_false);

   894 

   895   // Resolve on first use and initialize class.

   896   // Note: No race-condition here, since a resolve will always return the same result

   897 

   898   // Setup method for security checks

   899   k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK_false);

   900   k_h = instanceKlassHandle(THREAD, k);

   901   k_h->link_class(CHECK_false);

   902   m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_array_object_object_signature());

   903   if (m == NULL || m->is_static()) {

   904     THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(),

   905       "java.lang.reflect.Method.invoke", false);

   906   }

   907   Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false);

   908 

   909   // Setup method for registering loaded classes in class loader vector

   910   instanceKlass::cast(SystemDictionary::classloader_klass())->link_class(CHECK_false);

   911   m = instanceKlass::cast(SystemDictionary::classloader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature());

   912   if (m == NULL || m->is_static()) {

   913     THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(),

   914       "java.lang.ClassLoader.addClass", false);

   915   }

   916   Universe::_loader_addClass_cache->init(

   917     SystemDictionary::classloader_klass(), m, CHECK_false);

   918 

   919   // The folowing is initializing converter functions for serialization in

   920   // JVM.cpp. If we clean up the StrictMath code above we may want to find

   921   // a better solution for this as well.

   922   initialize_converter_functions();

   923 

   924   // This needs to be done before the first scavenge/gc, since

   925   // it's an input to soft ref clearing policy.

   926   Universe::update_heap_info_at_gc();

   927 

   928   // ("weak") refs processing infrastructure initialization

   929   Universe::heap()->post_initialize();

   930 

   931   GC_locker::unlock();  // allow gc after bootstrapping

   932 

   933   MemoryService::set_universe_heap(Universe::_collectedHeap);

   934   return true;

   935 }

   936 

   937 

   938 void Universe::compute_base_vtable_size() {

   939   _base_vtable_size = ClassLoader::compute_Object_vtable();

   940 }

   941 

   942 

   943 // %%% The Universe::flush_foo methods belong in CodeCache.

   944 

   945 // Flushes compiled methods dependent on dependee.

   946 void Universe::flush_dependents_on(instanceKlassHandle dependee) {

   947   assert_lock_strong(Compile_lock);

   948 

   949   if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;

   950 

   951   // CodeCache can only be updated by a thread_in_VM and they will all be

   952   // stopped dring the safepoint so CodeCache will be safe to update without

   953   // holding the CodeCache_lock.

   954 

   955   DepChange changes(dependee);

   956 

   957   // Compute the dependent nmethods

   958   if (CodeCache::mark_for_deoptimization(changes) > 0) {

   959     // At least one nmethod has been marked for deoptimization

   960     VM_Deoptimize op;

   961     VMThread::execute(&op);

   962   }

   963 }

   964 

   965 #ifdef HOTSWAP

   966 // Flushes compiled methods dependent on dependee in the evolutionary sense

   967 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) {

   968   // --- Compile_lock is not held. However we are at a safepoint.

   969   assert_locked_or_safepoint(Compile_lock);

   970   if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;

   971 

   972   // CodeCache can only be updated by a thread_in_VM and they will all be

   973   // stopped dring the safepoint so CodeCache will be safe to update without

   974   // holding the CodeCache_lock.

   975 

   976   // Compute the dependent nmethods

   977   if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) {

   978     // At least one nmethod has been marked for deoptimization

   979 

   980     // All this already happens inside a VM_Operation, so we'll do all the work here.

   981     // Stuff copied from VM_Deoptimize and modified slightly.

   982 

   983     // We do not want any GCs to happen while we are in the middle of this VM operation

   984     ResourceMark rm;

   985     DeoptimizationMarker dm;

   986 

   987     // Deoptimize all activations depending on marked nmethods

   988     Deoptimization::deoptimize_dependents();

   989 

   990     // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)

   991     CodeCache::make_marked_nmethods_not_entrant();

   992   }

   993 }

   994 #endif // HOTSWAP

   995 

   996 

   997 // Flushes compiled methods dependent on dependee

   998 void Universe::flush_dependents_on_method(methodHandle m_h) {

   999   // --- Compile_lock is not held. However we are at a safepoint.

  1000   assert_locked_or_safepoint(Compile_lock);

  1001 

  1002   // CodeCache can only be updated by a thread_in_VM and they will all be

  1003   // stopped dring the safepoint so CodeCache will be safe to update without

  1004   // holding the CodeCache_lock.

  1005 

  1006   // Compute the dependent nmethods

  1007   if (CodeCache::mark_for_deoptimization(m_h()) > 0) {

  1008     // At least one nmethod has been marked for deoptimization

  1009 

  1010     // All this already happens inside a VM_Operation, so we'll do all the work here.

  1011     // Stuff copied from VM_Deoptimize and modified slightly.

  1012 

  1013     // We do not want any GCs to happen while we are in the middle of this VM operation

  1014     ResourceMark rm;

  1015     DeoptimizationMarker dm;

  1016 

  1017     // Deoptimize all activations depending on marked nmethods

  1018     Deoptimization::deoptimize_dependents();

  1019 

  1020     // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)

  1021     CodeCache::make_marked_nmethods_not_entrant();

  1022   }

  1023 }

  1024 

  1025 void Universe::print() { print_on(gclog_or_tty); }

  1026 

  1027 void Universe::print_on(outputStream* st) {

  1028   st->print_cr("Heap");

  1029   heap()->print_on(st);

  1030 }

  1031 

  1032 void Universe::print_heap_at_SIGBREAK() {

  1033   if (PrintHeapAtSIGBREAK) {

  1034     MutexLocker hl(Heap_lock);

  1035     print_on(tty);

  1036     tty->cr();

  1037     tty->flush();

  1038   }

  1039 }

  1040 

  1041 void Universe::print_heap_before_gc(outputStream* st) {

  1042   st->print_cr("{Heap before GC invocations=%u (full %u):",

  1043                heap()->total_collections(),

  1044                heap()->total_full_collections());

  1045   heap()->print_on(st);

  1046 }

  1047 

  1048 void Universe::print_heap_after_gc(outputStream* st) {

  1049   st->print_cr("Heap after GC invocations=%u (full %u):",

  1050                heap()->total_collections(),

  1051                heap()->total_full_collections());

  1052   heap()->print_on(st);

  1053   st->print_cr("}");

  1054 }

  1055 

  1056 void Universe::verify(bool allow_dirty, bool silent) {

  1057   if (SharedSkipVerify) {

  1058     return;

  1059   }

  1060 

  1061   // The use of _verify_in_progress is a temporary work around for

  1062   // 6320749.  Don't bother with a creating a class to set and clear

  1063   // it since it is only used in this method and the control flow is

  1064   // straight forward.

  1065   _verify_in_progress = true;

  1066 

  1067   COMPILER2_PRESENT(

  1068     assert(!DerivedPointerTable::is_active(),

  1069          "DPT should not be active during verification "

  1070          "(of thread stacks below)");

  1071   )

  1072 

  1073   ResourceMark rm;

  1074   HandleMark hm;  // Handles created during verification can be zapped

  1075   _verify_count++;

  1076 

  1077   if (!silent) gclog_or_tty->print("[Verifying ");

  1078   if (!silent) gclog_or_tty->print("threads ");

  1079   Threads::verify();

  1080   heap()->verify(allow_dirty, silent);

  1081 

  1082   if (!silent) gclog_or_tty->print("syms ");

  1083   SymbolTable::verify();

  1084   if (!silent) gclog_or_tty->print("strs ");

  1085   StringTable::verify();

  1086   {

  1087     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

  1088     if (!silent) gclog_or_tty->print("zone ");

  1089     CodeCache::verify();

  1090   }

  1091   if (!silent) gclog_or_tty->print("dict ");

  1092   SystemDictionary::verify();

  1093   if (!silent) gclog_or_tty->print("hand ");

  1094   JNIHandles::verify();

  1095   if (!silent) gclog_or_tty->print("C-heap ");

  1096   os::check_heap();

  1097   if (!silent) gclog_or_tty->print_cr("]");

  1098 

  1099   _verify_in_progress = false;

  1100 }

  1101 

  1102 // Oop verification (see MacroAssembler::verify_oop)

  1103 

  1104 static uintptr_t _verify_oop_data[2]   = {0, (uintptr_t)-1};

  1105 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1};

  1106 

  1107 

  1108 static void calculate_verify_data(uintptr_t verify_data[2],

  1109                                   HeapWord* low_boundary,

  1110                                   HeapWord* high_boundary) {

  1111   assert(low_boundary < high_boundary, "bad interval");

  1112 

  1113   // decide which low-order bits we require to be clear:

  1114   size_t alignSize = MinObjAlignmentInBytes;

  1115   size_t min_object_size = oopDesc::header_size();

  1116 

  1117   // make an inclusive limit:

  1118   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;

  1119   uintptr_t min = (uintptr_t)low_boundary;

  1120   assert(min < max, "bad interval");

  1121   uintptr_t diff = max ^ min;

  1122 

  1123   // throw away enough low-order bits to make the diff vanish

  1124   uintptr_t mask = (uintptr_t)(-1);

  1125   while ((mask & diff) != 0)

  1126     mask <<= 1;

  1127   uintptr_t bits = (min & mask);

  1128   assert(bits == (max & mask), "correct mask");

  1129   // check an intermediate value between min and max, just to make sure:

  1130   assert(bits == ((min + (max-min)/2) & mask), "correct mask");

  1131 

  1132   // require address alignment, too:

  1133   mask |= (alignSize - 1);

  1134 

  1135   if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) {