duke@435: /*
acorn@4497:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
coleenp@4037: #include "classfile/javaClasses.hpp"
coleenp@4037: #include "classfile/dictionary.hpp"
stefank@2314: #include "classfile/systemDictionary.hpp"
stefank@2314: #include "classfile/vmSymbols.hpp"
coleenp@4037: #include "gc_implementation/shared/markSweep.inline.hpp"
stefank@2314: #include "gc_interface/collectedHeap.inline.hpp"
acorn@4497: #include "memory/heapInspection.hpp"
coleenp@4037: #include "memory/metadataFactory.hpp"
stefank@2314: #include "memory/oopFactory.hpp"
stefank@2314: #include "memory/resourceArea.hpp"
stefank@2314: #include "oops/instanceKlass.hpp"
stefank@2314: #include "oops/klass.inline.hpp"
stefank@2314: #include "oops/oop.inline2.hpp"
stefank@2314: #include "runtime/atomic.hpp"
coleenp@4037: #include "utilities/stack.hpp"
jprovino@4542: #include "utilities/macros.hpp"
jprovino@4542: #if INCLUDE_ALL_GCS
coleenp@4037: #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
coleenp@4037: #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
coleenp@4037: #include "gc_implementation/parallelScavenge/psScavenge.hpp"
jprovino@4542: #endif // INCLUDE_ALL_GCS
duke@435: 
coleenp@2497: void Klass::set_name(Symbol* n) {
coleenp@2497:   _name = n;
coleenp@2497:   if (_name != NULL) _name->increment_refcount();
coleenp@2497: }
duke@435: 
coleenp@4037: bool Klass::is_subclass_of(Klass* k) const {
duke@435:   // Run up the super chain and check
coleenp@4037:   if (this == k) return true;
duke@435: 
coleenp@4037:   Klass* t = const_cast<Klass*>(this)->super();
duke@435: 
duke@435:   while (t != NULL) {
duke@435:     if (t == k) return true;
hseigel@4278:     t = t->super();
duke@435:   }
duke@435:   return false;
duke@435: }
duke@435: 
coleenp@4037: bool Klass::search_secondary_supers(Klass* k) const {
duke@435:   // Put some extra logic here out-of-line, before the search proper.
duke@435:   // This cuts down the size of the inline method.
duke@435: 
duke@435:   // This is necessary, since I am never in my own secondary_super list.
coleenp@4037:   if (this == k)
duke@435:     return true;
duke@435:   // Scan the array-of-objects for a match
duke@435:   int cnt = secondary_supers()->length();
duke@435:   for (int i = 0; i < cnt; i++) {
coleenp@4037:     if (secondary_supers()->at(i) == k) {
duke@435:       ((Klass*)this)->set_secondary_super_cache(k);
duke@435:       return true;
duke@435:     }
duke@435:   }
duke@435:   return false;
duke@435: }
duke@435: 
duke@435: // Return self, except for abstract classes with exactly 1
duke@435: // implementor.  Then return the 1 concrete implementation.
duke@435: Klass *Klass::up_cast_abstract() {
duke@435:   Klass *r = this;
duke@435:   while( r->is_abstract() ) {   // Receiver is abstract?
duke@435:     Klass *s = r->subklass();   // Check for exactly 1 subklass
duke@435:     if( !s || s->next_sibling() ) // Oops; wrong count; give up
duke@435:       return this;              // Return 'this' as a no-progress flag
duke@435:     r = s;                    // Loop till find concrete class
duke@435:   }
duke@435:   return r;                   // Return the 1 concrete class
duke@435: }
duke@435: 
twisti@1040: // Find LCA in class hierarchy
duke@435: Klass *Klass::LCA( Klass *k2 ) {
duke@435:   Klass *k1 = this;
duke@435:   while( 1 ) {
coleenp@4037:     if( k1->is_subtype_of(k2) ) return k2;
coleenp@4037:     if( k2->is_subtype_of(k1) ) return k1;
coleenp@4037:     k1 = k1->super();
coleenp@4037:     k2 = k2->super();
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: void Klass::check_valid_for_instantiation(bool throwError, TRAPS) {
duke@435:   ResourceMark rm(THREAD);
duke@435:   THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
duke@435:             : vmSymbols::java_lang_InstantiationException(), external_name());
duke@435: }
duke@435: 
duke@435: 
duke@435: void Klass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) {
duke@435:   THROW(vmSymbols::java_lang_ArrayStoreException());
duke@435: }
duke@435: 
duke@435: 
duke@435: void Klass::initialize(TRAPS) {
duke@435:   ShouldNotReachHere();
duke@435: }
duke@435: 
coleenp@4037: bool Klass::compute_is_subtype_of(Klass* k) {
duke@435:   assert(k->is_klass(), "argument must be a class");
duke@435:   return is_subclass_of(k);
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: Method* Klass::uncached_lookup_method(Symbol* name, Symbol* signature) const {
duke@435: #ifdef ASSERT
duke@435:   tty->print_cr("Error: uncached_lookup_method called on a klass oop."
duke@435:                 " Likely error: reflection method does not correctly"
duke@435:                 " wrap return value in a mirror object.");
duke@435: #endif
duke@435:   ShouldNotReachHere();
duke@435:   return NULL;
duke@435: }
duke@435: 
coleenp@4037: void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) {
coleenp@4037:   return Metaspace::allocate(loader_data, word_size, /*read_only*/false,
coleenp@4037:                              Metaspace::ClassType, CHECK_NULL);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: Klass::Klass() {
coleenp@4037:   Klass* k = this;
duke@435: 
duke@435:   { // Preinitialize supertype information.
duke@435:     // A later call to initialize_supers() may update these settings:
coleenp@4037:     set_super(NULL);
duke@435:     for (juint i = 0; i < Klass::primary_super_limit(); i++) {
coleenp@4037:       _primary_supers[i] = NULL;
duke@435:     }
coleenp@4037:     set_secondary_supers(NULL);
coleenp@4037:     _primary_supers[0] = k;
coleenp@4037:     set_super_check_offset(in_bytes(primary_supers_offset()));
duke@435:   }
duke@435: 
coleenp@4037:   set_java_mirror(NULL);
coleenp@4037:   set_modifier_flags(0);
coleenp@4037:   set_layout_helper(Klass::_lh_neutral_value);
coleenp@4037:   set_name(NULL);
duke@435:   AccessFlags af;
duke@435:   af.set_flags(0);
coleenp@4037:   set_access_flags(af);
coleenp@4037:   set_subklass(NULL);
coleenp@4037:   set_next_sibling(NULL);
coleenp@4037:   set_next_link(NULL);
coleenp@4037:   set_alloc_count(0);
coleenp@4037:   TRACE_SET_KLASS_TRACE_ID(this, 0);
duke@435: 
coleenp@4037:   set_prototype_header(markOopDesc::prototype());
coleenp@4037:   set_biased_lock_revocation_count(0);
coleenp@4037:   set_last_biased_lock_bulk_revocation_time(0);
duke@435: 
coleenp@4037:   // The klass doesn't have any references at this point.
coleenp@4037:   clear_modified_oops();
coleenp@4037:   clear_accumulated_modified_oops();
duke@435: }
duke@435: 
duke@435: jint Klass::array_layout_helper(BasicType etype) {
duke@435:   assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype");
duke@435:   // Note that T_ARRAY is not allowed here.
duke@435:   int  hsize = arrayOopDesc::base_offset_in_bytes(etype);
kvn@464:   int  esize = type2aelembytes(etype);
duke@435:   bool isobj = (etype == T_OBJECT);
duke@435:   int  tag   =  isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value;
duke@435:   int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize));
duke@435: 
duke@435:   assert(lh < (int)_lh_neutral_value, "must look like an array layout");
coleenp@4037:   assert(layout_helper_is_array(lh), "correct kind");
duke@435:   assert(layout_helper_is_objArray(lh) == isobj, "correct kind");
duke@435:   assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind");
duke@435:   assert(layout_helper_header_size(lh) == hsize, "correct decode");
duke@435:   assert(layout_helper_element_type(lh) == etype, "correct decode");
duke@435:   assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode");
duke@435: 
duke@435:   return lh;
duke@435: }
duke@435: 
duke@435: bool Klass::can_be_primary_super_slow() const {
duke@435:   if (super() == NULL)
duke@435:     return true;
coleenp@4037:   else if (super()->super_depth() >= primary_super_limit()-1)
duke@435:     return false;
duke@435:   else
duke@435:     return true;
duke@435: }
duke@435: 
coleenp@4037: void Klass::initialize_supers(Klass* k, TRAPS) {
duke@435:   if (FastSuperclassLimit == 0) {
duke@435:     // None of the other machinery matters.
duke@435:     set_super(k);
duke@435:     return;
duke@435:   }
duke@435:   if (k == NULL) {
duke@435:     set_super(NULL);
coleenp@4037:     _primary_supers[0] = this;
duke@435:     assert(super_depth() == 0, "Object must already be initialized properly");
never@1577:   } else if (k != super() || k == SystemDictionary::Object_klass()) {
never@1577:     assert(super() == NULL || super() == SystemDictionary::Object_klass(),
duke@435:            "initialize this only once to a non-trivial value");
duke@435:     set_super(k);
coleenp@4037:     Klass* sup = k;
duke@435:     int sup_depth = sup->super_depth();
duke@435:     juint my_depth  = MIN2(sup_depth + 1, (int)primary_super_limit());
duke@435:     if (!can_be_primary_super_slow())
duke@435:       my_depth = primary_super_limit();
duke@435:     for (juint i = 0; i < my_depth; i++) {
coleenp@4037:       _primary_supers[i] = sup->_primary_supers[i];
duke@435:     }
coleenp@4037:     Klass* *super_check_cell;
duke@435:     if (my_depth < primary_super_limit()) {
coleenp@4037:       _primary_supers[my_depth] = this;
duke@435:       super_check_cell = &_primary_supers[my_depth];
duke@435:     } else {
duke@435:       // Overflow of the primary_supers array forces me to be secondary.
duke@435:       super_check_cell = &_secondary_super_cache;
duke@435:     }
coleenp@4037:     set_super_check_offset((address)super_check_cell - (address) this);
duke@435: 
duke@435: #ifdef ASSERT
duke@435:     {
duke@435:       juint j = super_depth();
duke@435:       assert(j == my_depth, "computed accessor gets right answer");
coleenp@4037:       Klass* t = this;
hseigel@4278:       while (!t->can_be_primary_super()) {
hseigel@4278:         t = t->super();
hseigel@4278:         j = t->super_depth();
duke@435:       }
duke@435:       for (juint j1 = j+1; j1 < primary_super_limit(); j1++) {
duke@435:         assert(primary_super_of_depth(j1) == NULL, "super list padding");
duke@435:       }
duke@435:       while (t != NULL) {
duke@435:         assert(primary_super_of_depth(j) == t, "super list initialization");
hseigel@4278:         t = t->super();
duke@435:         --j;
duke@435:       }
duke@435:       assert(j == (juint)-1, "correct depth count");
duke@435:     }
duke@435: #endif
duke@435:   }
duke@435: 
duke@435:   if (secondary_supers() == NULL) {
duke@435:     KlassHandle this_kh (THREAD, this);
duke@435: 
duke@435:     // Now compute the list of secondary supertypes.
duke@435:     // Secondaries can occasionally be on the super chain,
duke@435:     // if the inline "_primary_supers" array overflows.
duke@435:     int extras = 0;
coleenp@4037:     Klass* p;
coleenp@4037:     for (p = super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) {
duke@435:       ++extras;
duke@435:     }
duke@435: 
coleenp@4037:     ResourceMark rm(THREAD);  // need to reclaim GrowableArrays allocated below
coleenp@4037: 
duke@435:     // Compute the "real" non-extra secondaries.
coleenp@4037:     GrowableArray<Klass*>* secondaries = compute_secondary_supers(extras);
coleenp@4037:     if (secondaries == NULL) {
coleenp@4037:       // secondary_supers set by compute_secondary_supers
coleenp@4037:       return;
coleenp@4037:     }
duke@435: 
coleenp@4037:     GrowableArray<Klass*>* primaries = new GrowableArray<Klass*>(extras);
coleenp@4037: 
coleenp@4037:     for (p = this_kh->super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) {
duke@435:       int i;                    // Scan for overflow primaries being duplicates of 2nd'arys
duke@435: 
duke@435:       // This happens frequently for very deeply nested arrays: the
duke@435:       // primary superclass chain overflows into the secondary.  The
duke@435:       // secondary list contains the element_klass's secondaries with
duke@435:       // an extra array dimension added.  If the element_klass's
duke@435:       // secondary list already contains some primary overflows, they
duke@435:       // (with the extra level of array-ness) will collide with the
duke@435:       // normal primary superclass overflows.
coleenp@4037:       for( i = 0; i < secondaries->length(); i++ ) {
coleenp@4037:         if( secondaries->at(i) == p )
duke@435:           break;
coleenp@4037:       }
duke@435:       if( i < secondaries->length() )
duke@435:         continue;               // It's a dup, don't put it in
coleenp@4037:       primaries->push(p);
duke@435:     }
coleenp@4037:     // Combine the two arrays into a metadata object to pack the array.
coleenp@4037:     // The primaries are added in the reverse order, then the secondaries.
coleenp@4037:     int new_length = primaries->length() + secondaries->length();
coleenp@4037:     Array<Klass*>* s2 = MetadataFactory::new_array<Klass*>(
coleenp@4037:                                        class_loader_data(), new_length, CHECK);
coleenp@4037:     int fill_p = primaries->length();
coleenp@4037:     for (int j = 0; j < fill_p; j++) {
coleenp@4037:       s2->at_put(j, primaries->pop());  // add primaries in reverse order.
coleenp@4037:     }
coleenp@4037:     for( int j = 0; j < secondaries->length(); j++ ) {
coleenp@4037:       s2->at_put(j+fill_p, secondaries->at(j));  // add secondaries on the end.
duke@435:     }
duke@435: 
duke@435:   #ifdef ASSERT
duke@435:       // We must not copy any NULL placeholders left over from bootstrap.
coleenp@4037:     for (int j = 0; j < s2->length(); j++) {
coleenp@4037:       assert(s2->at(j) != NULL, "correct bootstrapping order");
duke@435:     }
duke@435:   #endif
duke@435: 
coleenp@4037:     this_kh->set_secondary_supers(s2);
duke@435:   }
duke@435: }
duke@435: 
coleenp@4037: GrowableArray<Klass*>* Klass::compute_secondary_supers(int num_extra_slots) {
duke@435:   assert(num_extra_slots == 0, "override for complex klasses");
coleenp@4037:   set_secondary_supers(Universe::the_empty_klass_array());
coleenp@4037:   return NULL;
duke@435: }
duke@435: 
duke@435: 
duke@435: Klass* Klass::subklass() const {
hseigel@4278:   return _subklass == NULL ? NULL : _subklass;
duke@435: }
duke@435: 
coleenp@4037: InstanceKlass* Klass::superklass() const {
coleenp@4037:   assert(super() == NULL || super()->oop_is_instance(), "must be instance klass");
coleenp@4037:   return _super == NULL ? NULL : InstanceKlass::cast(_super);
duke@435: }
duke@435: 
duke@435: Klass* Klass::next_sibling() const {
hseigel@4278:   return _next_sibling == NULL ? NULL : _next_sibling;
duke@435: }
duke@435: 
coleenp@4037: void Klass::set_subklass(Klass* s) {
coleenp@4037:   assert(s != this, "sanity check");
coleenp@4037:   _subklass = s;
duke@435: }
duke@435: 
coleenp@4037: void Klass::set_next_sibling(Klass* s) {
coleenp@4037:   assert(s != this, "sanity check");
coleenp@4037:   _next_sibling = s;
duke@435: }
duke@435: 
duke@435: void Klass::append_to_sibling_list() {
coleenp@4178:   debug_only(verify();)
duke@435:   // add ourselves to superklass' subklass list
coleenp@4037:   InstanceKlass* super = superklass();
duke@435:   if (super == NULL) return;        // special case: class Object
coleenp@4178:   assert((!super->is_interface()    // interfaces cannot be supers
duke@435:           && (super->superklass() == NULL || !is_interface())),
duke@435:          "an interface can only be a subklass of Object");
coleenp@4037:   Klass* prev_first_subklass = super->subklass_oop();
duke@435:   if (prev_first_subklass != NULL) {
duke@435:     // set our sibling to be the superklass' previous first subklass
duke@435:     set_next_sibling(prev_first_subklass);
duke@435:   }
duke@435:   // make ourselves the superklass' first subklass
coleenp@4037:   super->set_subklass(this);
coleenp@4178:   debug_only(verify();)
duke@435: }
duke@435: 
coleenp@4037: bool Klass::is_loader_alive(BoolObjectClosure* is_alive) {
coleenp@4037:   assert(is_metadata(), "p is not meta-data");
coleenp@4037:   assert(ClassLoaderDataGraph::contains((address)this), "is in the metaspace");
coleenp@4304: 
coleenp@4304: #ifdef ASSERT
coleenp@4037:   // The class is alive iff the class loader is alive.
coleenp@4037:   oop loader = class_loader();
coleenp@4304:   bool loader_alive = (loader == NULL) || is_alive->do_object_b(loader);
coleenp@4304: #endif // ASSERT
coleenp@4304: 
coleenp@4304:   // The class is alive if it's mirror is alive (which should be marked if the
coleenp@4304:   // loader is alive) unless it's an anoymous class.
coleenp@4304:   bool mirror_alive = is_alive->do_object_b(java_mirror());
coleenp@4304:   assert(!mirror_alive || loader_alive, "loader must be alive if the mirror is"
coleenp@4304:                         " but not the other way around with anonymous classes");
coleenp@4304:   return mirror_alive;
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void Klass::clean_weak_klass_links(BoolObjectClosure* is_alive) {
coleenp@4037:   if (!ClassUnloading) {
coleenp@4037:     return;
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   Klass* root = SystemDictionary::Object_klass();
coleenp@4037:   Stack<Klass*, mtGC> stack;
coleenp@4037: 
coleenp@4037:   stack.push(root);
coleenp@4037:   while (!stack.is_empty()) {
coleenp@4037:     Klass* current = stack.pop();
coleenp@4037: 
coleenp@4037:     assert(current->is_loader_alive(is_alive), "just checking, this should be live");
coleenp@4037: 
coleenp@4037:     // Find and set the first alive subklass
coleenp@4037:     Klass* sub = current->subklass_oop();
coleenp@4037:     while (sub != NULL && !sub->is_loader_alive(is_alive)) {
duke@435: #ifndef PRODUCT
coleenp@4304:       if (TraceClassUnloading && WizardMode) {
coleenp@4304:         ResourceMark rm;
coleenp@4037:         tty->print_cr("[Unlinking class (subclass) %s]", sub->external_name());
coleenp@4304:       }
duke@435: #endif
coleenp@4037:       sub = sub->next_sibling_oop();
duke@435:     }
coleenp@4037:     current->set_subklass(sub);
coleenp@4037:     if (sub != NULL) {
coleenp@4037:       stack.push(sub);
coleenp@4037:     }
coleenp@4037: 
coleenp@4037:     // Find and set the first alive sibling
coleenp@4037:     Klass* sibling = current->next_sibling_oop();
coleenp@4037:     while (sibling != NULL && !sibling->is_loader_alive(is_alive)) {
coleenp@4304:       if (TraceClassUnloading && WizardMode) {
coleenp@4304:         ResourceMark rm;
coleenp@4037:         tty->print_cr("[Unlinking class (sibling) %s]", sibling->external_name());
coleenp@4304:       }
coleenp@4037:       sibling = sibling->next_sibling_oop();
coleenp@4304:     }
coleenp@4037:     current->set_next_sibling(sibling);
coleenp@4037:     if (sibling != NULL) {
coleenp@4037:       stack.push(sibling);
coleenp@4304:     }
coleenp@4037: 
coleenp@4037:     // Clean the implementors list and method data.
coleenp@4037:     if (current->oop_is_instance()) {
coleenp@4037:       InstanceKlass* ik = InstanceKlass::cast(current);
coleenp@4037:       ik->clean_implementors_list(is_alive);
coleenp@4037:       ik->clean_method_data(is_alive);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
coleenp@4037: void Klass::klass_update_barrier_set(oop v) {
coleenp@4037:   record_modified_oops();
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void Klass::klass_update_barrier_set_pre(void* p, oop v) {
coleenp@4037:   // This barrier used by G1, where it's used remember the old oop values,
coleenp@4037:   // so that we don't forget any objects that were live at the snapshot at
coleenp@4037:   // the beginning. This function is only used when we write oops into
coleenp@4037:   // Klasses. Since the Klasses are used as roots in G1, we don't have to
coleenp@4037:   // do anything here.
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void Klass::klass_oop_store(oop* p, oop v) {
coleenp@4037:   assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata");
coleenp@4037:   assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object");
coleenp@4037: 
coleenp@4037:   // do the store
coleenp@4037:   if (always_do_update_barrier) {
coleenp@4037:     klass_oop_store((volatile oop*)p, v);
coleenp@4037:   } else {
coleenp@4037:     klass_update_barrier_set_pre((void*)p, v);
coleenp@4037:     *p = v;
coleenp@4037:     klass_update_barrier_set(v);
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void Klass::klass_oop_store(volatile oop* p, oop v) {
coleenp@4037:   assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata");
coleenp@4037:   assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object");
coleenp@4037: 
coleenp@4037:   klass_update_barrier_set_pre((void*)p, v);
coleenp@4037:   OrderAccess::release_store_ptr(p, v);
coleenp@4037:   klass_update_barrier_set(v);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: void Klass::oops_do(OopClosure* cl) {
coleenp@4037:   cl->do_oop(&_java_mirror);
coleenp@4037: }
duke@435: 
duke@435: void Klass::remove_unshareable_info() {
duke@435:   set_subklass(NULL);
duke@435:   set_next_sibling(NULL);
coleenp@4037:   // Clear the java mirror
coleenp@4037:   set_java_mirror(NULL);
coleenp@4037:   set_next_link(NULL);
coleenp@4037: 
coleenp@4037:   // Null out class_loader_data because we don't share that yet.
coleenp@4037:   set_class_loader_data(NULL);
duke@435: }
duke@435: 
coleenp@4037: void Klass::restore_unshareable_info(TRAPS) {
coleenp@4037:   ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
coleenp@4037:   // Restore class_loader_data to the null class loader data
coleenp@4037:   set_class_loader_data(loader_data);
duke@435: 
coleenp@4037:   // Add to null class loader list first before creating the mirror
coleenp@4037:   // (same order as class file parsing)
coleenp@4037:   loader_data->add_class(this);
coleenp@4037: 
coleenp@4037:   // Recreate the class mirror
coleenp@4037:   java_lang_Class::create_mirror(this, CHECK);
coleenp@2497: }
coleenp@2497: 
coleenp@4037: Klass* Klass::array_klass_or_null(int rank) {
duke@435:   EXCEPTION_MARK;
duke@435:   // No exception can be thrown by array_klass_impl when called with or_null == true.
duke@435:   // (In anycase, the execption mark will fail if it do so)
duke@435:   return array_klass_impl(true, rank, THREAD);
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: Klass* Klass::array_klass_or_null() {
duke@435:   EXCEPTION_MARK;
duke@435:   // No exception can be thrown by array_klass_impl when called with or_null == true.
duke@435:   // (In anycase, the execption mark will fail if it do so)
duke@435:   return array_klass_impl(true, THREAD);
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: Klass* Klass::array_klass_impl(bool or_null, int rank, TRAPS) {
coleenp@4142:   fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass");
duke@435:   return NULL;
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: Klass* Klass::array_klass_impl(bool or_null, TRAPS) {
coleenp@4142:   fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass");
duke@435:   return NULL;
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: void Klass::with_array_klasses_do(void f(Klass* k)) {
coleenp@4037:   f(this);
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: oop Klass::class_loader() const { return class_loader_data()->class_loader(); }
coleenp@4037: 
duke@435: const char* Klass::external_name() const {
jrose@866:   if (oop_is_instance()) {
coleenp@4037:     InstanceKlass* ik = (InstanceKlass*) this;
jrose@866:     if (ik->is_anonymous()) {
twisti@2698:       assert(EnableInvokeDynamic, "");
coleenp@4304:       intptr_t hash = 0;
coleenp@4304:       if (ik->java_mirror() != NULL) {
coleenp@4304:         // java_mirror might not be created yet, return 0 as hash.
coleenp@4304:         hash = ik->java_mirror()->identity_hash();
coleenp@4304:       }
jrose@866:       char     hash_buf[40];
jrose@866:       sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash);
jrose@866:       size_t   hash_len = strlen(hash_buf);
jrose@866: 
jrose@866:       size_t result_len = name()->utf8_length();
jrose@866:       char*  result     = NEW_RESOURCE_ARRAY(char, result_len + hash_len + 1);
jrose@866:       name()->as_klass_external_name(result, (int) result_len + 1);
jrose@866:       assert(strlen(result) == result_len, "");
jrose@866:       strcpy(result + result_len, hash_buf);
jrose@866:       assert(strlen(result) == result_len + hash_len, "");
jrose@866:       return result;
jrose@866:     }
jrose@866:   }
jrose@1474:   if (name() == NULL)  return "<unknown>";
duke@435:   return name()->as_klass_external_name();
duke@435: }
duke@435: 
duke@435: 
jrose@1474: const char* Klass::signature_name() const {
jrose@1474:   if (name() == NULL)  return "<unknown>";
duke@435:   return name()->as_C_string();
duke@435: }
duke@435: 
duke@435: // Unless overridden, modifier_flags is 0.
duke@435: jint Klass::compute_modifier_flags(TRAPS) const {
duke@435:   return 0;
duke@435: }
duke@435: 
duke@435: int Klass::atomic_incr_biased_lock_revocation_count() {
duke@435:   return (int) Atomic::add(1, &_biased_lock_revocation_count);
duke@435: }
duke@435: 
duke@435: // Unless overridden, jvmti_class_status has no flags set.
duke@435: jint Klass::jvmti_class_status() const {
duke@435:   return 0;
duke@435: }
duke@435: 
coleenp@4037: 
duke@435: // Printing
duke@435: 
coleenp@4037: void Klass::print_on(outputStream* st) const {
coleenp@4037:   ResourceMark rm;
coleenp@4037:   // print title
coleenp@4037:   st->print("%s", internal_name());
coleenp@4037:   print_address_on(st);
coleenp@4037:   st->cr();
coleenp@4037: }
coleenp@4037: 
duke@435: void Klass::oop_print_on(oop obj, outputStream* st) {
duke@435:   ResourceMark rm;
duke@435:   // print title
duke@435:   st->print_cr("%s ", internal_name());
duke@435:   obj->print_address_on(st);
duke@435: 
duke@435:   if (WizardMode) {
duke@435:      // print header
duke@435:      obj->mark()->print_on(st);
duke@435:   }
duke@435: 
duke@435:   // print class
duke@435:   st->print(" - klass: ");
duke@435:   obj->klass()->print_value_on(st);
duke@435:   st->cr();
duke@435: }
duke@435: 
duke@435: void Klass::oop_print_value_on(oop obj, outputStream* st) {
duke@435:   // print title
duke@435:   ResourceMark rm;              // Cannot print in debug mode without this
duke@435:   st->print("%s", internal_name());
duke@435:   obj->print_address_on(st);
duke@435: }
duke@435: 
acorn@4497: #if INCLUDE_SERVICES
acorn@4497: // Size Statistics
acorn@4497: void Klass::collect_statistics(KlassSizeStats *sz) const {
acorn@4497:   sz->_klass_bytes = sz->count(this);
acorn@4497:   sz->_mirror_bytes = sz->count(java_mirror());
acorn@4497:   sz->_secondary_supers_bytes = sz->count_array(secondary_supers());
acorn@4497: 
acorn@4497:   sz->_ro_bytes += sz->_secondary_supers_bytes;
acorn@4497:   sz->_rw_bytes += sz->_klass_bytes + sz->_mirror_bytes;
acorn@4497: }
acorn@4497: #endif // INCLUDE_SERVICES
coleenp@4037: 
duke@435: // Verification
duke@435: 
coleenp@4037: void Klass::verify_on(outputStream* st) {
coleenp@4037:   guarantee(!Universe::heap()->is_in_reserved(this), "Shouldn't be");
coleenp@4037:   guarantee(this->is_metadata(), "should be in metaspace");
coleenp@4037: 
coleenp@4037:   assert(ClassLoaderDataGraph::contains((address)this), "Should be");
coleenp@4037: 
coleenp@4037:   guarantee(this->is_klass(),"should be klass");
coleenp@4037: 
coleenp@4037:   if (super() != NULL) {
coleenp@4037:     guarantee(super()->is_metadata(), "should be in metaspace");
coleenp@4037:     guarantee(super()->is_klass(), "should be klass");
coleenp@4037:   }
coleenp@4037:   if (secondary_super_cache() != NULL) {
coleenp@4037:     Klass* ko = secondary_super_cache();
coleenp@4037:     guarantee(ko->is_metadata(), "should be in metaspace");
coleenp@4037:     guarantee(ko->is_klass(), "should be klass");
coleenp@4037:   }
coleenp@4037:   for ( uint i = 0; i < primary_super_limit(); i++ ) {
coleenp@4037:     Klass* ko = _primary_supers[i];
coleenp@4037:     if (ko != NULL) {
coleenp@4037:       guarantee(ko->is_metadata(), "should be in metaspace");
coleenp@4037:       guarantee(ko->is_klass(), "should be klass");
coleenp@4037:     }
coleenp@4037:   }
coleenp@4037: 
coleenp@4037:   if (java_mirror() != NULL) {
coleenp@4037:     guarantee(java_mirror()->is_oop(), "should be instance");
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
duke@435: void Klass::oop_verify_on(oop obj, outputStream* st) {
duke@435:   guarantee(obj->is_oop(),  "should be oop");
coleenp@4037:   guarantee(obj->klass()->is_metadata(), "should not be in Java heap");
duke@435:   guarantee(obj->klass()->is_klass(), "klass field is not a klass");
duke@435: }
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: 
duke@435: void Klass::verify_vtable_index(int i) {
duke@435:   if (oop_is_instance()) {
coleenp@4037:     assert(i>=0 && i<((InstanceKlass*)this)->vtable_length()/vtableEntry::size(), "index out of bounds");
duke@435:   } else {
coleenp@4037:     assert(oop_is_array(), "Must be");
coleenp@4142:     assert(i>=0 && i<((ArrayKlass*)this)->vtable_length()/vtableEntry::size(), "index out of bounds");
duke@435:   }
duke@435: }
duke@435: 
duke@435: #endif