jdk8-mips64-public/hotspot: src/share/vm/memory/universe.cpp@ec98e58952b2 (annotated)

src/share/vm/memory/universe.cpp@ec98e58952b2 (annotated)

src/share/vm/memory/universe.cpp

Tue, 11 Sep 2012 14:59:23 +0200

author: stefank
date: Tue, 11 Sep 2012 14:59:23 +0200
changeset 4050: ec98e58952b2
parent 4048: 11fb740ce98f
child 4062: 2a48c84f1d04
permissions: -rw-r--r--

7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
Summary: Fix the iteration over the system classes and report the correct reference kind.
Reviewed-by: coleenp, rbackman

 /*
  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/classLoader.hpp"
 #include "classfile/classLoaderData.hpp"
 #include "classfile/javaClasses.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "code/codeCache.hpp"
 #include "code/dependencies.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/interpreter.hpp"
 #include "memory/cardTableModRefBS.hpp"
 #include "memory/gcLocker.inline.hpp"
 #include "memory/genCollectedHeap.hpp"
 #include "memory/genRemSet.hpp"
 #include "memory/generation.hpp"
 #include "memory/metadataFactory.hpp"
 #include "memory/metaspaceShared.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/space.hpp"
 #include "memory/universe.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/constantPool.hpp"
 #include "oops/instanceClassLoaderKlass.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/instanceMirrorKlass.hpp"
 #include "oops/instanceRefKlass.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/typeArrayKlass.hpp"
 #include "prims/jvmtiRedefineClassesTrace.hpp"
 #include "runtime/aprofiler.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/deoptimization.hpp"
 #include "runtime/fprofiler.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/init.hpp"
 #include "runtime/java.hpp"
 #include "runtime/javaCalls.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/synchronizer.hpp"
 #include "runtime/timer.hpp"
 #include "runtime/vm_operations.hpp"
 #include "services/memoryService.hpp"
 #include "utilities/copy.hpp"
 #include "utilities/events.hpp"
 #include "utilities/hashtable.inline.hpp"
 #include "utilities/preserveException.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "thread_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "thread_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "thread_windows.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_bsd
 # include "thread_bsd.inline.hpp"
 #endif
 #ifndef SERIALGC
 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp"
 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
 #endif
 // Known objects
 Klass* Universe::_boolArrayKlassObj                 = NULL;
 Klass* Universe::_byteArrayKlassObj                 = NULL;
 Klass* Universe::_charArrayKlassObj                 = NULL;
 Klass* Universe::_intArrayKlassObj                  = NULL;
 Klass* Universe::_shortArrayKlassObj                = NULL;
 Klass* Universe::_longArrayKlassObj                 = NULL;
 Klass* Universe::_singleArrayKlassObj               = NULL;
 Klass* Universe::_doubleArrayKlassObj               = NULL;
 Klass* Universe::_typeArrayKlassObjs[T_VOID+1]      = { NULL /*, NULL...*/ };
 Klass* Universe::_objectArrayKlassObj               = NULL;
 oop Universe::_int_mirror                             = NULL;
 oop Universe::_float_mirror                           = NULL;
 oop Universe::_double_mirror                          = NULL;
 oop Universe::_byte_mirror                            = NULL;
 oop Universe::_bool_mirror                            = NULL;
 oop Universe::_char_mirror                            = NULL;
 oop Universe::_long_mirror                            = NULL;
 oop Universe::_short_mirror                           = NULL;
 oop Universe::_void_mirror                            = NULL;
 oop Universe::_mirrors[T_VOID+1]                      = { NULL /*, NULL...*/ };
 oop Universe::_main_thread_group                      = NULL;
 oop Universe::_system_thread_group                    = NULL;
 objArrayOop Universe::_the_empty_class_klass_array    = NULL;
 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
 oop Universe::_the_null_string                        = NULL;
 oop Universe::_the_min_jint_string                   = NULL;
 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL;
 ActiveMethodOopsCache* Universe::_reflect_invoke_cache    = NULL;
 oop Universe::_out_of_memory_error_java_heap          = NULL;
 oop Universe::_out_of_memory_error_perm_gen           = NULL;
 oop Universe::_out_of_memory_error_array_size         = NULL;
 oop Universe::_out_of_memory_error_gc_overhead_limit  = NULL;
 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
 bool Universe::_verify_in_progress                    = false;
 oop Universe::_null_ptr_exception_instance            = NULL;
 oop Universe::_arithmetic_exception_instance          = NULL;
 oop Universe::_virtual_machine_error_instance         = NULL;
 oop Universe::_vm_exception                           = NULL;
 Array<int>* Universe::_the_empty_int_array            = NULL;
 Array<u2>* Universe::_the_empty_short_array           = NULL;
 Array<Klass*>* Universe::_the_empty_klass_array     = NULL;
 Array<Method*>* Universe::_the_empty_method_array   = NULL;
 // These variables are guarded by FullGCALot_lock.
 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
 debug_only(int Universe::_fullgc_alot_dummy_next      = 0;)
 // Heap
 int             Universe::_verify_count = 0;
 int             Universe::_base_vtable_size = 0;
 bool            Universe::_bootstrapping = false;
 bool            Universe::_fully_initialized = false;
 size_t          Universe::_heap_capacity_at_last_gc;
 size_t          Universe::_heap_used_at_last_gc = 0;
 CollectedHeap*  Universe::_collectedHeap = NULL;
 NarrowOopStruct Universe::_narrow_oop = { NULL, 0, true };
 void Universe::basic_type_classes_do(void f(Klass*)) {
   f(boolArrayKlassObj());
   f(byteArrayKlassObj());
   f(charArrayKlassObj());
   f(intArrayKlassObj());
   f(shortArrayKlassObj());
   f(longArrayKlassObj());
   f(singleArrayKlassObj());
   f(doubleArrayKlassObj());
 }
 void Universe::oops_do(OopClosure* f, bool do_all) {
   f->do_oop((oop*) &_int_mirror);
   f->do_oop((oop*) &_float_mirror);
   f->do_oop((oop*) &_double_mirror);
   f->do_oop((oop*) &_byte_mirror);
   f->do_oop((oop*) &_bool_mirror);
   f->do_oop((oop*) &_char_mirror);
   f->do_oop((oop*) &_long_mirror);
   f->do_oop((oop*) &_short_mirror);
   f->do_oop((oop*) &_void_mirror);
   for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
     f->do_oop((oop*) &_mirrors[i]);
   }
   assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
   f->do_oop((oop*)&_the_empty_class_klass_array);
   f->do_oop((oop*)&_the_null_string);
   f->do_oop((oop*)&_the_min_jint_string);
   f->do_oop((oop*)&_out_of_memory_error_java_heap);
   f->do_oop((oop*)&_out_of_memory_error_perm_gen);
   f->do_oop((oop*)&_out_of_memory_error_array_size);
   f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
     f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
   f->do_oop((oop*)&_null_ptr_exception_instance);
   f->do_oop((oop*)&_arithmetic_exception_instance);
   f->do_oop((oop*)&_virtual_machine_error_instance);
   f->do_oop((oop*)&_main_thread_group);
   f->do_oop((oop*)&_system_thread_group);
   f->do_oop((oop*)&_vm_exception);
   debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
 }
 // Serialize metadata in and out of CDS archive, not oops.
 void Universe::serialize(SerializeClosure* f, bool do_all) {
   f->do_ptr((void**)&_boolArrayKlassObj);
   f->do_ptr((void**)&_byteArrayKlassObj);
   f->do_ptr((void**)&_charArrayKlassObj);
   f->do_ptr((void**)&_intArrayKlassObj);
   f->do_ptr((void**)&_shortArrayKlassObj);
   f->do_ptr((void**)&_longArrayKlassObj);
   f->do_ptr((void**)&_singleArrayKlassObj);
   f->do_ptr((void**)&_doubleArrayKlassObj);
   f->do_ptr((void**)&_objectArrayKlassObj);
   {
     for (int i = 0; i < T_VOID+1; i++) {
       if (_typeArrayKlassObjs[i] != NULL) {
         assert(i >= T_BOOLEAN, "checking");
         f->do_ptr((void**)&_typeArrayKlassObjs[i]);
       } else if (do_all) {
         f->do_ptr((void**)&_typeArrayKlassObjs[i]);
       }
     }
   }
   f->do_ptr((void**)&_the_array_interfaces_array);
   f->do_ptr((void**)&_the_empty_int_array);
   f->do_ptr((void**)&_the_empty_short_array);
   f->do_ptr((void**)&_the_empty_method_array);
   f->do_ptr((void**)&_the_empty_klass_array);
   _finalizer_register_cache->serialize(f);
   _reflect_invoke_cache->serialize(f);
 }
 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
   if (size < alignment || size % alignment != 0) {
     ResourceMark rm;
     stringStream st;
     st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment);
     char* error = st.as_string();
     vm_exit_during_initialization(error);
   }
 }
 void initialize_basic_type_klass(Klass* k, TRAPS) {
   Klass* ok = SystemDictionary::Object_klass();
   if (UseSharedSpaces) {
     assert(k->super() == ok, "u3");
     k->restore_unshareable_info(CHECK);
   } else {
     k->initialize_supers(ok, CHECK);
   }
   k->append_to_sibling_list();
 }
 void Universe::genesis(TRAPS) {
   ResourceMark rm;
   { FlagSetting fs(_bootstrapping, true);
     { MutexLocker mc(Compile_lock);
       // determine base vtable size; without that we cannot create the array klasses
       compute_base_vtable_size();
       if (!UseSharedSpaces) {
         _boolArrayKlassObj      = typeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
         _charArrayKlassObj      = typeArrayKlass::create_klass(T_CHAR,    sizeof(jchar),    CHECK);
         _singleArrayKlassObj    = typeArrayKlass::create_klass(T_FLOAT,   sizeof(jfloat),   CHECK);
         _doubleArrayKlassObj    = typeArrayKlass::create_klass(T_DOUBLE,  sizeof(jdouble),  CHECK);
         _byteArrayKlassObj      = typeArrayKlass::create_klass(T_BYTE,    sizeof(jbyte),    CHECK);
         _shortArrayKlassObj     = typeArrayKlass::create_klass(T_SHORT,   sizeof(jshort),   CHECK);
         _intArrayKlassObj       = typeArrayKlass::create_klass(T_INT,     sizeof(jint),     CHECK);
         _longArrayKlassObj      = typeArrayKlass::create_klass(T_LONG,    sizeof(jlong),    CHECK);
         _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
         _typeArrayKlassObjs[T_CHAR]    = _charArrayKlassObj;
         _typeArrayKlassObjs[T_FLOAT]   = _singleArrayKlassObj;
         _typeArrayKlassObjs[T_DOUBLE]  = _doubleArrayKlassObj;
         _typeArrayKlassObjs[T_BYTE]    = _byteArrayKlassObj;
         _typeArrayKlassObjs[T_SHORT]   = _shortArrayKlassObj;
         _typeArrayKlassObjs[T_INT]     = _intArrayKlassObj;
         _typeArrayKlassObjs[T_LONG]    = _longArrayKlassObj;
         ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
         _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
         _the_empty_int_array        = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
         _the_empty_short_array      = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
         _the_empty_method_array     = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
         _the_empty_klass_array      = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
       }
     }
     vmSymbols::initialize(CHECK);
     SystemDictionary::initialize(CHECK);
     Klass* ok = SystemDictionary::Object_klass();
     _the_null_string            = StringTable::intern("null", CHECK);
     _the_min_jint_string       = StringTable::intern("-2147483648", CHECK);
     if (UseSharedSpaces) {
       // Verify shared interfaces array.
       assert(_the_array_interfaces_array->at(0) ==
              SystemDictionary::Cloneable_klass(), "u3");
       assert(_the_array_interfaces_array->at(1) ==
              SystemDictionary::Serializable_klass(), "u3");
     } else {
       // Set up shared interfaces array.  (Do this before supers are set up.)
       _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
       _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
     }
     initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
     initialize_basic_type_klass(charArrayKlassObj(), CHECK);
     initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
     initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
     initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
     initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
     initialize_basic_type_klass(intArrayKlassObj(), CHECK);
     initialize_basic_type_klass(longArrayKlassObj(), CHECK);
   } // end of core bootstrapping
   // Maybe this could be lifted up now that object array can be initialized
   // during the bootstrapping.
   // OLD
   // Initialize _objectArrayKlass after core bootstraping to make
   // sure the super class is set up properly for _objectArrayKlass.
   // ---
   // NEW
   // Since some of the old system object arrays have been converted to
   // ordinary object arrays, _objectArrayKlass will be loaded when
   // SystemDictionary::initialize(CHECK); is run. See the extra check
   // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
   _objectArrayKlassObj = InstanceKlass::
     cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
   // OLD
   // Add the class to the class hierarchy manually to make sure that
   // its vtable is initialized after core bootstrapping is completed.
   // ---
   // New
   // Have already been initialized.
   Klass::cast(_objectArrayKlassObj)->append_to_sibling_list();
   // Compute is_jdk version flags.
   // Only 1.3 or later has the java.lang.Shutdown class.
   // Only 1.4 or later has the java.lang.CharSequence interface.
   // Only 1.5 or later has the java.lang.management.MemoryUsage class.
   if (JDK_Version::is_partially_initialized()) {
     uint8_t jdk_version;
     Klass* k = SystemDictionary::resolve_or_null(
         vmSymbols::java_lang_management_MemoryUsage(), THREAD);
     CLEAR_PENDING_EXCEPTION; // ignore exceptions
     if (k == NULL) {
       k = SystemDictionary::resolve_or_null(
           vmSymbols::java_lang_CharSequence(), THREAD);
       CLEAR_PENDING_EXCEPTION; // ignore exceptions
       if (k == NULL) {
         k = SystemDictionary::resolve_or_null(
             vmSymbols::java_lang_Shutdown(), THREAD);
         CLEAR_PENDING_EXCEPTION; // ignore exceptions
         if (k == NULL) {
           jdk_version = 2;
         } else {
           jdk_version = 3;
         }
       } else {
         jdk_version = 4;
       }
     } else {
       jdk_version = 5;
     }
     JDK_Version::fully_initialize(jdk_version);
   }
   #ifdef ASSERT
   if (FullGCALot) {
     // Allocate an array of dummy objects.
     // We'd like these to be at the bottom of the old generation,
     // so that when we free one and then collect,
     // (almost) the whole heap moves
     // and we find out if we actually update all the oops correctly.
     // But we can't allocate directly in the old generation,
     // so we allocate wherever, and hope that the first collection
     // moves these objects to the bottom of the old generation.
     // We can allocate directly in the permanent generation, so we do.
     int size;
     if (UseConcMarkSweepGC) {
       warning("Using +FullGCALot with concurrent mark sweep gc "
               "will not force all objects to relocate");
       size = FullGCALotDummies;
     } else {
       size = FullGCALotDummies * 2;
     }
     objArrayOop    naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
     objArrayHandle dummy_array(THREAD, naked_array);
     int i = 0;
     while (i < size) {
         // Allocate dummy in old generation
       oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK);
       dummy_array->obj_at_put(i++, dummy);
     }
     {
       // Only modify the global variable inside the mutex.
       // If we had a race to here, the other dummy_array instances
       // and their elements just get dropped on the floor, which is fine.
       MutexLocker ml(FullGCALot_lock);
       if (_fullgc_alot_dummy_array == NULL) {
         _fullgc_alot_dummy_array = dummy_array();
       }
     }
     assert(i == _fullgc_alot_dummy_array->length(), "just checking");
   }
   #endif
 }
 // CDS support for patching vtables in metadata in the shared archive.
 // All types inherited from Metadata have vtables, but not types inherited
 // from MetaspaceObj, because the latter does not have virtual functions.
 // If the metadata type has a vtable, it cannot be shared in the read-only
 // section of the CDS archive, because the vtable pointer is patched.
 static inline void* dereference(void* addr) {
   return *(void**)addr;
 }
 static inline void add_vtable(void** list, int* n, void* o, int count) {
   guarantee((*n) < count, "vtable list too small");
   void* vtable = dereference(o);
   assert(dereference(vtable) != NULL, "invalid vtable");
   list[(*n)++] = vtable;
 }
 void Universe::init_self_patching_vtbl_list(void** list, int count) {
   int n = 0;
   { InstanceKlass o;          add_vtable(list, &n, &o, count); }
   { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
   { InstanceMirrorKlass o;    add_vtable(list, &n, &o, count); }
   { InstanceRefKlass o;       add_vtable(list, &n, &o, count); }
   { typeArrayKlass o;         add_vtable(list, &n, &o, count); }
   { objArrayKlass o;          add_vtable(list, &n, &o, count); }
   { Method o;                 add_vtable(list, &n, &o, count); }
   { ConstantPool o;           add_vtable(list, &n, &o, count); }
 }
 void Universe::initialize_basic_type_mirrors(TRAPS) {
     assert(_int_mirror==NULL, "basic type mirrors already initialized");
     _int_mirror     =
       java_lang_Class::create_basic_type_mirror("int",    T_INT, CHECK);
     _float_mirror   =
       java_lang_Class::create_basic_type_mirror("float",  T_FLOAT,   CHECK);
     _double_mirror  =
       java_lang_Class::create_basic_type_mirror("double", T_DOUBLE,  CHECK);
     _byte_mirror    =
       java_lang_Class::create_basic_type_mirror("byte",   T_BYTE, CHECK);
     _bool_mirror    =
       java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
     _char_mirror    =
       java_lang_Class::create_basic_type_mirror("char",   T_CHAR, CHECK);
     _long_mirror    =
       java_lang_Class::create_basic_type_mirror("long",   T_LONG, CHECK);
     _short_mirror   =
       java_lang_Class::create_basic_type_mirror("short",  T_SHORT,   CHECK);
     _void_mirror    =
       java_lang_Class::create_basic_type_mirror("void",   T_VOID, CHECK);
     _mirrors[T_INT]     = _int_mirror;
     _mirrors[T_FLOAT]   = _float_mirror;
     _mirrors[T_DOUBLE]  = _double_mirror;
     _mirrors[T_BYTE]    = _byte_mirror;
     _mirrors[T_BOOLEAN] = _bool_mirror;
     _mirrors[T_CHAR]    = _char_mirror;
     _mirrors[T_LONG]    = _long_mirror;
     _mirrors[T_SHORT]   = _short_mirror;
     _mirrors[T_VOID]    = _void_mirror;
   //_mirrors[T_OBJECT]  = InstanceKlass::cast(_object_klass)->java_mirror();
   //_mirrors[T_ARRAY]   = InstanceKlass::cast(_object_klass)->java_mirror();
 }
 void Universe::fixup_mirrors(TRAPS) {
   // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
   // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
   // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
   // that the number of objects allocated at this point is very small.
   assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
   HandleMark hm(THREAD);
   // Cache the start of the static fields
   InstanceMirrorKlass::init_offset_of_static_fields();
   GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
   int list_length = list->length();
   for (int i = 0; i < list_length; i++) {
     Klass* k = list->at(i);
     assert(k->is_klass(), "List should only hold classes");
     EXCEPTION_MARK;
     KlassHandle kh(THREAD, k);
     java_lang_Class::fixup_mirror(kh, CATCH);
 }
   delete java_lang_Class::fixup_mirror_list();
   java_lang_Class::set_fixup_mirror_list(NULL);
 }
 static bool has_run_finalizers_on_exit = false;
 void Universe::run_finalizers_on_exit() {
   if (has_run_finalizers_on_exit) return;
   has_run_finalizers_on_exit = true;
   // Called on VM exit. This ought to be run in a separate thread.
   if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit");
   {
     PRESERVE_EXCEPTION_MARK;
     KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
     JavaValue result(T_VOID);
     JavaCalls::call_static(
       &result,
       finalizer_klass,
       vmSymbols::run_finalizers_on_exit_name(),
       vmSymbols::void_method_signature(),
       THREAD
     );
     // Ignore any pending exceptions
     CLEAR_PENDING_EXCEPTION;
   }
 }
 // initialize_vtable could cause gc if
 // 1) we specified true to initialize_vtable and
 // 2) this ran after gc was enabled
 // In case those ever change we use handles for oops
 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
   // init vtable of k and all subclasses
   Klass* ko = k_h();
   klassVtable* vt = ko->vtable();
   if (vt) vt->initialize_vtable(false, CHECK);
   if (ko->oop_is_instance()) {
     InstanceKlass* ik = (InstanceKlass*)ko;
     for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) {
       reinitialize_vtable_of(s_h, CHECK);
     }
   }
 }
 void initialize_itable_for_klass(Klass* k, TRAPS) {
   InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
 }
 void Universe::reinitialize_itables(TRAPS) {
   SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
 }
 bool Universe::on_page_boundary(void* addr) {
   return ((uintptr_t) addr) % os::vm_page_size() == 0;
 }
 bool Universe::should_fill_in_stack_trace(Handle throwable) {
   // never attempt to fill in the stack trace of preallocated errors that do not have
   // backtrace. These errors are kept alive forever and may be "re-used" when all
   // preallocated errors with backtrace have been consumed. Also need to avoid
   // a potential loop which could happen if an out of memory occurs when attempting
   // to allocate the backtrace.
   return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
           (throwable() != Universe::_out_of_memory_error_perm_gen)  &&
           (throwable() != Universe::_out_of_memory_error_array_size) &&
           (throwable() != Universe::_out_of_memory_error_gc_overhead_limit));
 }
 oop Universe::gen_out_of_memory_error(oop default_err) {
   // generate an out of memory error:
   // - if there is a preallocated error with backtrace available then return it wth
   //   a filled in stack trace.
   // - if there are no preallocated errors with backtrace available then return
   //   an error without backtrace.
   int next;
   if (_preallocated_out_of_memory_error_avail_count > 0) {
     next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
     assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
   } else {
     next = -1;
   }
   if (next < 0) {
     // all preallocated errors have been used.
     // return default
     return default_err;
   } else {
     // get the error object at the slot and set set it to NULL so that the
     // array isn't keeping it alive anymore.
     oop exc = preallocated_out_of_memory_errors()->obj_at(next);
     assert(exc != NULL, "slot has been used already");
     preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
     // use the message from the default error
     oop msg = java_lang_Throwable::message(default_err);
     assert(msg != NULL, "no message");
     java_lang_Throwable::set_message(exc, msg);
     // populate the stack trace and return it.
     java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
     return exc;
   }
 }
 static intptr_t non_oop_bits = 0;
 void* Universe::non_oop_word() {
   // Neither the high bits nor the low bits of this value is allowed
   // to look like (respectively) the high or low bits of a real oop.
   //
   // High and low are CPU-specific notions, but low always includes
   // the low-order bit.  Since oops are always aligned at least mod 4,
   // setting the low-order bit will ensure that the low half of the
   // word will never look like that of a real oop.
   //
   // Using the OS-supplied non-memory-address word (usually 0 or -1)
   // will take care of the high bits, however many there are.
   if (non_oop_bits == 0) {
     non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
   }
   return (void*)non_oop_bits;
 }
 jint universe_init() {
   assert(!Universe::_fully_initialized, "called after initialize_vtables");
   guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
          "LogHeapWordSize is incorrect.");
   guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
   guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
             "oop size is not not a multiple of HeapWord size");
   TraceTime timer("Genesis", TraceStartupTime);
   GC_locker::lock();  // do not allow gc during bootstrapping
   JavaClasses::compute_hard_coded_offsets();
   jint status = Universe::initialize_heap();
   if (status != JNI_OK) {
     return status;
   }
   // Create memory for metadata.  Must be after initializing heap for
   // DumpSharedSpaces.
   ClassLoaderData::init_null_class_loader_data();
   // We have a heap so create the Method* caches before
   // Metaspace::initialize_shared_spaces() tries to populate them.
   Universe::_finalizer_register_cache = new LatestMethodOopCache();
   Universe::_reflect_invoke_cache     = new ActiveMethodOopsCache();
   if (UseSharedSpaces) {
     // Read the data structures supporting the shared spaces (shared
     // system dictionary, symbol table, etc.).  After that, access to
     // the file (other than the mapped regions) is no longer needed, and
     // the file is closed. Closing the file does not affect the
     // currently mapped regions.
     MetaspaceShared::initialize_shared_spaces();
     StringTable::create_table();
   } else {
     SymbolTable::create_table();
     StringTable::create_table();
     ClassLoader::create_package_info_table();
   }
   return JNI_OK;
 }
 // Choose the heap base address and oop encoding mode
 // when compressed oops are used:
 // Unscaled  - Use 32-bits oops without encoding when
 //     NarrowOopHeapBaseMin + heap_size < 4Gb
 // ZeroBased - Use zero based compressed oops with encoding when
 //     NarrowOopHeapBaseMin + heap_size < 32Gb
 // HeapBased - Use compressed oops with heap base + encoding.
 // 4Gb
 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1);
 // 32Gb
 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes;
 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) {
   size_t base = 0;
 #ifdef _LP64
   if (UseCompressedOops) {
     assert(mode == UnscaledNarrowOop  ||
            mode == ZeroBasedNarrowOop ||
            mode == HeapBasedNarrowOop, "mode is invalid");
     const size_t total_size = heap_size + HeapBaseMinAddress;
     // Return specified base for the first request.
     if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) {
       base = HeapBaseMinAddress;
     } else if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) {
       if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) &&
           (Universe::narrow_oop_shift() == 0)) {
         // Use 32-bits oops without encoding and
         // place heap's top on the 4Gb boundary
         base = (NarrowOopHeapMax - heap_size);
       } else {
         // Can't reserve with NarrowOopShift == 0
         Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
         if (mode == UnscaledNarrowOop ||
             mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) {
           // Use zero based compressed oops with encoding and
           // place heap's top on the 32Gb boundary in case
           // total_size > 4Gb or failed to reserve below 4Gb.
           base = (OopEncodingHeapMax - heap_size);
         }
       }
     } else {
       // Can't reserve below 32Gb.
       Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
     }
     // Set narrow_oop_base and narrow_oop_use_implicit_null_checks
     // used in ReservedHeapSpace() constructors.
     // The final values will be set in initialize_heap() below.
     if (base != 0 && (base + heap_size) <= OopEncodingHeapMax) {
       // Use zero based compressed oops
       Universe::set_narrow_oop_base(NULL);
       // Don't need guard page for implicit checks in indexed
       // addressing mode with zero based Compressed Oops.
       Universe::set_narrow_oop_use_implicit_null_checks(true);
     } else {
       // Set to a non-NULL value so the ReservedSpace ctor computes
       // the correct no-access prefix.
       // The final value will be set in initialize_heap() below.
       Universe::set_narrow_oop_base((address)NarrowOopHeapMax);
 #ifdef _WIN64
       if (UseLargePages) {
         // Cannot allocate guard pages for implicit checks in indexed
         // addressing mode when large pages are specified on windows.
         Universe::set_narrow_oop_use_implicit_null_checks(false);
       }
 #endif //  _WIN64
     }
   }
 #endif
   return (char*)base; // also return NULL (don't care) for 32-bit VM
 }
 jint Universe::initialize_heap() {
   if (UseParallelGC) {
 #ifndef SERIALGC
     Universe::_collectedHeap = new ParallelScavengeHeap();
 #else  // SERIALGC
     fatal("UseParallelGC not supported in java kernel vm.");
 #endif // SERIALGC
   } else if (UseG1GC) {
 #ifndef SERIALGC
     G1CollectorPolicy* g1p = new G1CollectorPolicy();
     G1CollectedHeap* g1h = new G1CollectedHeap(g1p);
     Universe::_collectedHeap = g1h;
 #else  // SERIALGC
     fatal("UseG1GC not supported in java kernel vm.");
 #endif // SERIALGC
   } else {
     GenCollectorPolicy *gc_policy;
     if (UseSerialGC) {
       gc_policy = new MarkSweepPolicy();
     } else if (UseConcMarkSweepGC) {
 #ifndef SERIALGC
       if (UseAdaptiveSizePolicy) {
         gc_policy = new ASConcurrentMarkSweepPolicy();
       } else {
         gc_policy = new ConcurrentMarkSweepPolicy();
       }
 #else   // SERIALGC
     fatal("UseConcMarkSweepGC not supported in java kernel vm.");
 #endif // SERIALGC
     } else { // default old generation
       gc_policy = new MarkSweepPolicy();
     }
     Universe::_collectedHeap = new GenCollectedHeap(gc_policy);
   }
   jint status = Universe::heap()->initialize();
   if (status != JNI_OK) {
     return status;
   }
 #ifdef _LP64
   if (UseCompressedOops) {
     // Subtract a page because something can get allocated at heap base.
     // This also makes implicit null checking work, because the
     // memory+1 page below heap_base needs to cause a signal.
     // See needs_explicit_null_check.
     // Only set the heap base for compressed oops because it indicates
     // compressed oops for pstack code.
     bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose);
     if (verbose) {
       tty->cr();
       tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
                  Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M);
     }
     if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) {
       // Can't reserve heap below 32Gb.
       Universe::set_narrow_oop_base(Universe::heap()->base() - os::vm_page_size());
       Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
       if (verbose) {
         tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base());
       }
     } else {
       Universe::set_narrow_oop_base(0);
       if (verbose) {
         tty->print(", zero based Compressed Oops");
       }
 #ifdef _WIN64
       if (!Universe::narrow_oop_use_implicit_null_checks()) {
         // Don't need guard page for implicit checks in indexed addressing
         // mode with zero based Compressed Oops.
         Universe::set_narrow_oop_use_implicit_null_checks(true);
       }
 #endif //  _WIN64
       if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) {
         // Can't reserve heap below 4Gb.
         Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
       } else {
         Universe::set_narrow_oop_shift(0);
         if (verbose) {
           tty->print(", 32-bits Oops");
         }
       }
     }
     if (verbose) {
       tty->cr();
       tty->cr();
     }
   }
   assert(Universe::narrow_oop_base() == (Universe::heap()->base() - os::vm_page_size()) ||
          Universe::narrow_oop_base() == NULL, "invalid value");
   assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
          Universe::narrow_oop_shift() == 0, "invalid value");
 #endif
   // We will never reach the CATCH below since Exceptions::_throw will cause
   // the VM to exit if an exception is thrown during initialization
   if (UseTLAB) {
     assert(Universe::heap()->supports_tlab_allocation(),
            "Should support thread-local allocation buffers");
     ThreadLocalAllocBuffer::startup_initialization();
   }
   return JNI_OK;
 }
 // Reserve the Java heap, which is now the same for all GCs.
 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
   // Add in the class metaspace area so the classes in the headers can
   // be compressed the same as instances.
   size_t total_reserved = align_size_up(heap_size + ClassMetaspaceSize, alignment);
   char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop);
   ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr);
   if (UseCompressedOops) {
     if (addr != NULL && !total_rs.is_reserved()) {
       // Failed to reserve at specified address - the requested memory
       // region is taken already, for example, by 'java' launcher.
       // Try again to reserver heap higher.
       addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop);
       ReservedHeapSpace total_rs0(total_reserved, alignment,
                                   UseLargePages, addr);
       if (addr != NULL && !total_rs0.is_reserved()) {
         // Failed to reserve at specified address again - give up.
         addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop);
         assert(addr == NULL, "");
         ReservedHeapSpace total_rs1(total_reserved, alignment,
                                     UseLargePages, addr);
         total_rs = total_rs1;
       } else {
         total_rs = total_rs0;
       }
     }
   }
   if (!total_rs.is_reserved()) {
     vm_exit_during_initialization(err_msg("Could not reserve enough space for object heap %d bytes", total_reserved));
     return total_rs;
   }
   // Split the reserved space into main Java heap and a space for classes
   // so that they can be compressed using the same algorithm as compressed oops
   ReservedSpace heap_rs = total_rs.first_part(heap_size);
   ReservedSpace class_rs = total_rs.last_part(heap_size, alignment);
   Metaspace::initialize_class_space(class_rs);
   return heap_rs;
 }
 // It's the caller's repsonsibility to ensure glitch-freedom
 // (if required).
 void Universe::update_heap_info_at_gc() {
   _heap_capacity_at_last_gc = heap()->capacity();
   _heap_used_at_last_gc     = heap()->used();
 }
 void universe2_init() {
   EXCEPTION_MARK;
   Universe::genesis(CATCH);
   // Although we'd like to verify here that the state of the heap
   // is good, we can't because the main thread has not yet added
   // itself to the threads list (so, using current interfaces
   // we can't "fill" its TLAB), unless TLABs are disabled.
   if (VerifyBeforeGC && !UseTLAB &&
       Universe::heap()->total_collections() >= VerifyGCStartAt) {
      Universe::heap()->prepare_for_verify();
      Universe::verify();   // make sure we're starting with a clean slate
   }
 }
 // This function is defined in JVM.cpp
 extern void initialize_converter_functions();
 bool universe_post_init() {
   assert(!is_init_completed(), "Error: initialization not yet completed!");
   Universe::_fully_initialized = true;
   EXCEPTION_MARK;
   { ResourceMark rm;
     Interpreter::initialize();      // needed for interpreter entry points
     if (!UseSharedSpaces) {
       HandleMark hm(THREAD);
       KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
       Universe::reinitialize_vtable_of(ok_h, CHECK_false);
       Universe::reinitialize_itables(CHECK_false);
     }
   }
   HandleMark hm(THREAD);
   Klass* k;
   instanceKlassHandle k_h;
     // Setup preallocated empty java.lang.Class array
     Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
     // Setup preallocated OutOfMemoryError errors
     k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
     k_h = instanceKlassHandle(THREAD, k);
     Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
     Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false);
     Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
     Universe::_out_of_memory_error_gc_overhead_limit =
       k_h->allocate_instance(CHECK_false);
     // Setup preallocated NullPointerException
     // (this is currently used for a cheap & dirty solution in compiler exception handling)
     k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
     Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
     // Setup preallocated ArithmeticException
     // (this is currently used for a cheap & dirty solution in compiler exception handling)
     k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
     Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
     // Virtual Machine Error for when we get into a situation we can't resolve
     k = SystemDictionary::resolve_or_fail(
       vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
     bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
     if (!linked) {
       tty->print_cr("Unable to link/verify VirtualMachineError class");
       return false; // initialization failed
     }
     Universe::_virtual_machine_error_instance =
       InstanceKlass::cast(k)->allocate_instance(CHECK_false);
     Universe::_vm_exception               = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
   if (!DumpSharedSpaces) {
     // These are the only Java fields that are currently set during shared space dumping.
     // We prefer to not handle this generally, so we always reinitialize these detail messages.
     Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
     java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
     msg = java_lang_String::create_from_str("Metadata space", CHECK_false);
     java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg());
     msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
     java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
     msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
     java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
     msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
     java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
     // Setup the array of errors that have preallocated backtrace
     k = Universe::_out_of_memory_error_java_heap->klass();
     assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
     k_h = instanceKlassHandle(THREAD, k);
     int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
     Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
     for (int i=0; i<len; i++) {
       oop err = k_h->allocate_instance(CHECK_false);
       Handle err_h = Handle(THREAD, err);
       java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
       Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
     }
     Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
   }
   // Setup static method for registering finalizers
   // The finalizer klass must be linked before looking up the method, in
   // case it needs to get rewritten.
   InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false);
   Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method(
                                   vmSymbols::register_method_name(),
                                   vmSymbols::register_method_signature());
   if (m == NULL || !m->is_static()) {
     THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(),
       "java.lang.ref.Finalizer.register", false);
   }
   Universe::_finalizer_register_cache->init(
     SystemDictionary::Finalizer_klass(), m, CHECK_false);
   // Resolve on first use and initialize class.
   // Note: No race-condition here, since a resolve will always return the same result
   // Setup method for security checks
   k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false);
   k_h = instanceKlassHandle(THREAD, k);
   k_h->link_class(CHECK_false);
   m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature());
   if (m == NULL || m->is_static()) {
     THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(),
       "java.lang.reflect.Method.invoke", false);
   }
   Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false);
   // The folowing is initializing converter functions for serialization in
   // JVM.cpp. If we clean up the StrictMath code above we may want to find
   // a better solution for this as well.
   initialize_converter_functions();
   // This needs to be done before the first scavenge/gc, since
   // it's an input to soft ref clearing policy.
   {
     MutexLocker x(Heap_lock);
     Universe::update_heap_info_at_gc();
   }
   // ("weak") refs processing infrastructure initialization
   Universe::heap()->post_initialize();
   // Initialize performance counters for metaspaces
   MetaspaceCounters::initialize_performance_counters();
   GC_locker::unlock();  // allow gc after bootstrapping
   MemoryService::set_universe_heap(Universe::_collectedHeap);
   return true;
 }
 void Universe::compute_base_vtable_size() {
   _base_vtable_size = ClassLoader::compute_Object_vtable();
 }
 // %%% The Universe::flush_foo methods belong in CodeCache.
 // Flushes compiled methods dependent on dependee.
 void Universe::flush_dependents_on(instanceKlassHandle dependee) {
   assert_lock_strong(Compile_lock);
   if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
   // CodeCache can only be updated by a thread_in_VM and they will all be
   // stopped dring the safepoint so CodeCache will be safe to update without
   // holding the CodeCache_lock.
   KlassDepChange changes(dependee);
   // Compute the dependent nmethods
   if (CodeCache::mark_for_deoptimization(changes) > 0) {
     // At least one nmethod has been marked for deoptimization
     VM_Deoptimize op;
     VMThread::execute(&op);
   }
 }
 // Flushes compiled methods dependent on a particular CallSite
 // instance when its target is different than the given MethodHandle.
 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) {
   assert_lock_strong(Compile_lock);
   if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
   // CodeCache can only be updated by a thread_in_VM and they will all be
   // stopped dring the safepoint so CodeCache will be safe to update without
   // holding the CodeCache_lock.
   CallSiteDepChange changes(call_site(), method_handle());
   // Compute the dependent nmethods that have a reference to a
   // CallSite object.  We use InstanceKlass::mark_dependent_nmethod
   // directly instead of CodeCache::mark_for_deoptimization because we
   // want dependents on the call site class only not all classes in
   // the ContextStream.
   int marked = 0;
   {
     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
     InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass());
     marked = call_site_klass->mark_dependent_nmethods(changes);
   }
   if (marked > 0) {
     // At least one nmethod has been marked for deoptimization
     VM_Deoptimize op;
     VMThread::execute(&op);
   }
 }
 #ifdef HOTSWAP
 // Flushes compiled methods dependent on dependee in the evolutionary sense
 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) {
   // --- Compile_lock is not held. However we are at a safepoint.
   assert_locked_or_safepoint(Compile_lock);
   if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
   // CodeCache can only be updated by a thread_in_VM and they will all be
   // stopped dring the safepoint so CodeCache will be safe to update without
   // holding the CodeCache_lock.
   // Compute the dependent nmethods
   if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) {
     // At least one nmethod has been marked for deoptimization
     // All this already happens inside a VM_Operation, so we'll do all the work here.
     // Stuff copied from VM_Deoptimize and modified slightly.
     // We do not want any GCs to happen while we are in the middle of this VM operation
     ResourceMark rm;
     DeoptimizationMarker dm;
     // Deoptimize all activations depending on marked nmethods
     Deoptimization::deoptimize_dependents();
     // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
     CodeCache::make_marked_nmethods_not_entrant();
   }
 }
 #endif // HOTSWAP
 // Flushes compiled methods dependent on dependee
 void Universe::flush_dependents_on_method(methodHandle m_h) {
   // --- Compile_lock is not held. However we are at a safepoint.
   assert_locked_or_safepoint(Compile_lock);
   // CodeCache can only be updated by a thread_in_VM and they will all be
   // stopped dring the safepoint so CodeCache will be safe to update without
   // holding the CodeCache_lock.
   // Compute the dependent nmethods
   if (CodeCache::mark_for_deoptimization(m_h()) > 0) {
     // At least one nmethod has been marked for deoptimization
     // All this already happens inside a VM_Operation, so we'll do all the work here.
     // Stuff copied from VM_Deoptimize and modified slightly.
     // We do not want any GCs to happen while we are in the middle of this VM operation
     ResourceMark rm;
     DeoptimizationMarker dm;
     // Deoptimize all activations depending on marked nmethods
     Deoptimization::deoptimize_dependents();
     // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
     CodeCache::make_marked_nmethods_not_entrant();
   }
 }
 void Universe::print() {
   print_on(gclog_or_tty);
 }
 void Universe::print_on(outputStream* st, bool extended) {
   st->print_cr("Heap");
   if (!extended) {
     heap()->print_on(st);
   } else {
     heap()->print_extended_on(st);
   }
 }
 void Universe::print_heap_at_SIGBREAK() {
   if (PrintHeapAtSIGBREAK) {
     MutexLocker hl(Heap_lock);
     print_on(tty);
     tty->cr();
     tty->flush();
   }
 }
 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) {
   st->print_cr("{Heap before GC invocations=%u (full %u):",
                heap()->total_collections(),
                heap()->total_full_collections());
   if (!PrintHeapAtGCExtended || ignore_extended) {
     heap()->print_on(st);
   } else {
     heap()->print_extended_on(st);
   }
 }
 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) {
   st->print_cr("Heap after GC invocations=%u (full %u):",
                heap()->total_collections(),
                heap()->total_full_collections());
   if (!PrintHeapAtGCExtended || ignore_extended) {
     heap()->print_on(st);
   } else {
     heap()->print_extended_on(st);
   }
   st->print_cr("}");
 }
 void Universe::verify(bool silent, VerifyOption option) {
   if (SharedSkipVerify) {
     return;
   }
   // The use of _verify_in_progress is a temporary work around for
   // 6320749.  Don't bother with a creating a class to set and clear
   // it since it is only used in this method and the control flow is
   // straight forward.
   _verify_in_progress = true;
   COMPILER2_PRESENT(
     assert(!DerivedPointerTable::is_active(),
          "DPT should not be active during verification "
          "(of thread stacks below)");
   )
   ResourceMark rm;
   HandleMark hm;  // Handles created during verification can be zapped
   _verify_count++;
   if (!silent) gclog_or_tty->print("[Verifying ");
   if (!silent) gclog_or_tty->print("threads ");
   Threads::verify();
   heap()->verify(silent, option);
   if (!silent) gclog_or_tty->print("syms ");
   SymbolTable::verify();
   if (!silent) gclog_or_tty->print("strs ");
   StringTable::verify();
   {
     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
     if (!silent) gclog_or_tty->print("zone ");
     CodeCache::verify();
   }
   if (!silent) gclog_or_tty->print("dict ");
   SystemDictionary::verify();
 #ifndef PRODUCT
   if (!silent) gclog_or_tty->print("cldg ");
   ClassLoaderDataGraph::verify();
 #endif
   if (!silent) gclog_or_tty->print("hand ");
   JNIHandles::verify();
   if (!silent) gclog_or_tty->print("C-heap ");
   os::check_heap();
   if (!silent) gclog_or_tty->print("code cache ");
   CodeCache::verify_oops();
   if (!silent) gclog_or_tty->print_cr("]");
   _verify_in_progress = false;
 }
 // Oop verification (see MacroAssembler::verify_oop)
 static uintptr_t _verify_oop_data[2]   = {0, (uintptr_t)-1};
 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1};
 static void calculate_verify_data(uintptr_t verify_data[2],
                                   HeapWord* low_boundary,
                                   HeapWord* high_boundary) {
   assert(low_boundary < high_boundary, "bad interval");
   // decide which low-order bits we require to be clear:
   size_t alignSize = MinObjAlignmentInBytes;
   size_t min_object_size = CollectedHeap::min_fill_size();
   // make an inclusive limit:
   uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
   uintptr_t min = (uintptr_t)low_boundary;
   assert(min < max, "bad interval");
   uintptr_t diff = max ^ min;
   // throw away enough low-order bits to make the diff vanish
   uintptr_t mask = (uintptr_t)(-1);
   while ((mask & diff) != 0)
     mask <<= 1;
   uintptr_t bits = (min & mask);
   assert(bits == (max & mask), "correct mask");
   // check an intermediate value between min and max, just to make sure:
   assert(bits == ((min + (max-min)/2) & mask), "correct mask");
   // require address alignment, too:
   mask |= (alignSize - 1);
   if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) {
     assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability");
   }
   verify_data[0] = mask;
   verify_data[1] = bits;
 }
 // Oop verification (see MacroAssembler::verify_oop)
 #ifndef PRODUCT
 uintptr_t Universe::verify_oop_mask() {
   MemRegion m = heap()->reserved_region();
   calculate_verify_data(_verify_oop_data,
                         m.start(),
                         m.end());
   return _verify_oop_data[0];
 }
 uintptr_t Universe::verify_oop_bits() {
   verify_oop_mask();
   return _verify_oop_data[1];
 }
 uintptr_t Universe::verify_mark_mask() {
   return markOopDesc::lock_mask_in_place;
 }
 uintptr_t Universe::verify_mark_bits() {
   intptr_t mask = verify_mark_mask();
   intptr_t bits = (intptr_t)markOopDesc::prototype();
   assert((bits & ~mask) == 0, "no stray header bits");
   return bits;
 }
 #endif // PRODUCT
 void Universe::compute_verify_oop_data() {
   verify_oop_mask();
   verify_oop_bits();
   verify_mark_mask();
   verify_mark_bits();
 }
 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) {
   if (!UseSharedSpaces) {
     _klass = k;
   }
 #ifndef PRODUCT
   else {
     // sharing initilization should have already set up _klass
     assert(_klass != NULL, "just checking");
   }
 #endif
   _method_idnum = m->method_idnum();
   assert(_method_idnum >= 0, "sanity check");
 }
 ActiveMethodOopsCache::~ActiveMethodOopsCache() {
   if (_prev_methods != NULL) {
     delete _prev_methods;
     _prev_methods = NULL;
   }
 }
 void ActiveMethodOopsCache::add_previous_version(Method* const method) {
   assert(Thread::current()->is_VM_thread(),
     "only VMThread can add previous versions");
   // Only append the previous method if it is executing on the stack.
   if (method->on_stack()) {
   if (_prev_methods == NULL) {
     // This is the first previous version so make some space.
     // Start with 2 elements under the assumption that the class
     // won't be redefined much.
       _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true);
   }
   // RC_TRACE macro has an embedded ResourceMark
   RC_TRACE(0x00000100,
     ("add: %s(%s): adding prev version ref for cached method @%d",
     method->name()->as_C_string(), method->signature()->as_C_string(),
     _prev_methods->length()));
     _prev_methods->append(method);
   }
   // Since the caller is the VMThread and we are at a safepoint, this is a good
   // time to clear out unused method references.
   if (_prev_methods == NULL) return;
   for (int i = _prev_methods->length() - 1; i >= 0; i--) {
     Method* method = _prev_methods->at(i);
     assert(method != NULL, "weak method ref was unexpectedly cleared");
     if (!method->on_stack()) {
       // This method isn't running anymore so remove it
       _prev_methods->remove_at(i);
       MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method);
     } else {
       // RC_TRACE macro has an embedded ResourceMark
       RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive",
         method->name()->as_C_string(), method->signature()->as_C_string(), i));
     }
   }
 } // end add_previous_version()
 bool ActiveMethodOopsCache::is_same_method(Method* const method) const {
   InstanceKlass* ik = InstanceKlass::cast(klass());
   Method* check_method = ik->method_with_idnum(method_idnum());
   assert(check_method != NULL, "sanity check");
   if (check_method == method) {
     // done with the easy case
     return true;
   }
   if (_prev_methods != NULL) {
     // The cached method has been redefined at least once so search
     // the previous versions for a match.
     for (int i = 0; i < _prev_methods->length(); i++) {
       check_method = _prev_methods->at(i);
       if (check_method == method) {
         // a previous version matches
         return true;
       }
     }
   }
   // either no previous versions or no previous version matched
   return false;
 }
 Method* LatestMethodOopCache::get_Method() {
   InstanceKlass* ik = InstanceKlass::cast(klass());
   Method* m = ik->method_with_idnum(method_idnum());
   assert(m != NULL, "sanity check");
   return m;
 }
 #ifdef ASSERT
 // Release dummy object(s) at bottom of heap
 bool Universe::release_fullgc_alot_dummy() {
   MutexLocker ml(FullGCALot_lock);
   if (_fullgc_alot_dummy_array != NULL) {
     if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
       // No more dummies to release, release entire array instead
       _fullgc_alot_dummy_array = NULL;
       return false;
     }
     if (!UseConcMarkSweepGC) {
       // Release dummy at bottom of old generation
       _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
     }
     // Release dummy at bottom of permanent generation
     _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
   }
   return true;
 }
 #endif // ASSERT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/universe.cpp@ec98e58952b2 (annotated)

src/share/vm/memory/universe.cpp