jdk8-mips64-public/hotspot: src/share/vm/oops/klass.cpp@4735d2c84362 (annotated)

src/share/vm/oops/klass.cpp@4735d2c84362 (annotated)

src/share/vm/oops/klass.cpp

Thu, 11 Oct 2012 12:25:42 -0400

author: kamg
date: Thu, 11 Oct 2012 12:25:42 -0400
changeset 4245: 4735d2c84362
parent 4178: bdb5f8c9978b
child 4278: 070d523b96a7
permissions: -rw-r--r--

7200776: Implement default methods in interfaces
Summary: Add generic type analysis and default method selection algorithms
Reviewed-by: coleenp, acorn

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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/klass.cpp@4735d2c84362 (annotated)

src/share/vm/oops/klass.cpp