jdk8-mips64-public/hotspot: src/share/vm/oops/klass.cpp@8012aa3ccede (annotated)

src/share/vm/oops/klass.cpp@8012aa3ccede (annotated)

src/share/vm/oops/klass.cpp

Thu, 13 Jan 2011 22:15:41 -0800

author: never
date: Thu, 13 Jan 2011 22:15:41 -0800
changeset 2462: 8012aa3ccede
parent 2314: f95d63e2154a
child 2497: 3582bf76420e
permissions: -rw-r--r--

4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed

 /*
  * Copyright (c) 1997, 2010, 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/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/resourceArea.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/klass.inline.hpp"
 #include "oops/klassOop.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/oop.inline2.hpp"
 #include "runtime/atomic.hpp"
 bool Klass::is_subclass_of(klassOop k) const {
   // Run up the super chain and check
   klassOop t = as_klassOop();
   if (t == k) return true;
   t = Klass::cast(t)->super();
   while (t != NULL) {
     if (t == k) return true;
     t = Klass::cast(t)->super();
   }
   return false;
 }
 bool Klass::search_secondary_supers(klassOop 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->as_klassOop() == 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()->obj_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->as_klassOop()) ) return k2;
     if( k2->is_subtype_of(k1->as_klassOop()) ) return k1;
     k1 = k1->super()->klass_part();
     k2 = k2->super()->klass_part();
   }
 }
 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(klassOop k) {
   assert(k->is_klass(), "argument must be a class");
   return is_subclass_of(k);
 }
 methodOop Klass::uncached_lookup_method(symbolOop name, symbolOop 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;
 }
 klassOop Klass::base_create_klass_oop(KlassHandle& klass, int size,
                                       const Klass_vtbl& vtbl, TRAPS) {
   size = align_object_size(size);
   // allocate and initialize vtable
   Klass*   kl = (Klass*) vtbl.allocate_permanent(klass, size, CHECK_NULL);
   klassOop k  = kl->as_klassOop();
   { // Preinitialize supertype information.
     // A later call to initialize_supers() may update these settings:
     kl->set_super(NULL);
     for (juint i = 0; i < Klass::primary_super_limit(); i++) {
       kl->_primary_supers[i] = NULL;
     }
     kl->set_secondary_supers(NULL);
     oop_store_without_check((oop*) &kl->_primary_supers[0], k);
     kl->set_super_check_offset(primary_supers_offset_in_bytes() + sizeof(oopDesc));
   }
   kl->set_java_mirror(NULL);
   kl->set_modifier_flags(0);
   kl->set_layout_helper(Klass::_lh_neutral_value);
   kl->set_name(NULL);
   AccessFlags af;
   af.set_flags(0);
   kl->set_access_flags(af);
   kl->set_subklass(NULL);
   kl->set_next_sibling(NULL);
   kl->set_alloc_count(0);
   kl->set_alloc_size(0);
   kl->set_prototype_header(markOopDesc::prototype());
   kl->set_biased_lock_revocation_count(0);
   kl->set_last_biased_lock_bulk_revocation_time(0);
   return k;
 }
 KlassHandle Klass::base_create_klass(KlassHandle& klass, int size,
                                      const Klass_vtbl& vtbl, TRAPS) {
   klassOop ek = base_create_klass_oop(klass, size, vtbl, THREAD);
   return KlassHandle(THREAD, ek);
 }
 void Klass_vtbl::post_new_init_klass(KlassHandle& klass,
                                      klassOop new_klass,
                                      int size) const {
   assert(!new_klass->klass_part()->null_vtbl(), "Not a complete klass");
   CollectedHeap::post_allocation_install_obj_klass(klass, new_klass, size);
 }
 void* Klass_vtbl::operator new(size_t ignored, KlassHandle& klass,
                                int size, TRAPS) {
   // The vtable pointer is installed during the execution of
   // constructors in the call to permanent_obj_allocate().  Delay
   // the installation of the klass pointer into the new klass "k"
   // until after the vtable pointer has been installed (i.e., until
   // after the return of permanent_obj_allocate().
   klassOop k =
     (klassOop) CollectedHeap::permanent_obj_allocate_no_klass_install(klass,
       size, CHECK_NULL);
   return k->klass_part();
 }
 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_javaArray(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()->klass_part()->super_depth() >= primary_super_limit()-1)
     return false;
   else
     return true;
 }
 void Klass::initialize_supers(klassOop k, TRAPS) {
   if (FastSuperclassLimit == 0) {
     // None of the other machinery matters.
     set_super(k);
     return;
   }
   if (k == NULL) {
     set_super(NULL);
     oop_store_without_check((oop*) &_primary_supers[0], (oop) this->as_klassOop());
     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->klass_part();
     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++) {
       oop_store_without_check((oop*) &_primary_supers[i], (oop) sup->_primary_supers[i]);
     }
     klassOop *super_check_cell;
     if (my_depth < primary_super_limit()) {
       oop_store_without_check((oop*) &_primary_supers[my_depth], (oop) this->as_klassOop());
       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->as_klassOop());
 #ifdef ASSERT
     {
       juint j = super_depth();
       assert(j == my_depth, "computed accessor gets right answer");
       klassOop t = as_klassOop();
       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;
     klassOop p;
     for (p = super(); !(p == NULL || p->klass_part()->can_be_primary_super()); p = p->klass_part()->super()) {
       ++extras;
     }
     // Compute the "real" non-extra secondaries.
     objArrayOop secondary_oops = compute_secondary_supers(extras, CHECK);
     objArrayHandle secondaries (THREAD, secondary_oops);
     // Store the extra secondaries in the first array positions:
     int fillp = extras;
     for (p = this_kh->super(); !(p == NULL || p->klass_part()->can_be_primary_super()); p = p->klass_part()->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 = extras; i < secondaries->length(); i++ )
         if( secondaries->obj_at(i) == p )
           break;
       if( i < secondaries->length() )
         continue;               // It's a dup, don't put it in
       secondaries->obj_at_put(--fillp, p);
     }
     // See if we had some dup's, so the array has holes in it.
     if( fillp > 0 ) {
       // Pack the array.  Drop the old secondaries array on the floor
       // and let GC reclaim it.
       objArrayOop s2 = oopFactory::new_system_objArray(secondaries->length() - fillp, CHECK);
       for( int i = 0; i < s2->length(); i++ )
         s2->obj_at_put( i, secondaries->obj_at(i+fillp) );
       secondaries = objArrayHandle(THREAD, s2);
     }
   #ifdef ASSERT
     if (secondaries() != Universe::the_array_interfaces_array()) {
       // We must not copy any NULL placeholders left over from bootstrap.
       for (int j = 0; j < secondaries->length(); j++) {
         assert(secondaries->obj_at(j) != NULL, "correct bootstrapping order");
       }
     }
   #endif
     this_kh->set_secondary_supers(secondaries());
   }
 }
 objArrayOop Klass::compute_secondary_supers(int num_extra_slots, TRAPS) {
   assert(num_extra_slots == 0, "override for complex klasses");
   return Universe::the_empty_system_obj_array();
 }
 Klass* Klass::subklass() const {
   return _subklass == NULL ? NULL : Klass::cast(_subklass);
 }
 instanceKlass* Klass::superklass() const {
   assert(super() == NULL || super()->klass_part()->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(klassOop s) {
   assert(s != as_klassOop(), "sanity check");
   oop_store_without_check((oop*)&_subklass, s);
 }
 void Klass::set_next_sibling(klassOop s) {
   assert(s != as_klassOop(), "sanity check");
   oop_store_without_check((oop*)&_next_sibling, s);
 }
 void Klass::append_to_sibling_list() {
   debug_only(if (!SharedSkipVerify) as_klassOop()->verify();)
   // add ourselves to superklass' subklass list
   instanceKlass* super = superklass();
   if (super == NULL) return;        // special case: class Object
   assert(SharedSkipVerify ||
          (!super->is_interface()    // interfaces cannot be supers
           && (super->superklass() == NULL || !is_interface())),
          "an interface can only be a subklass of Object");
   klassOop 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(as_klassOop());
   debug_only(if (!SharedSkipVerify) as_klassOop()->verify();)
 }
 void Klass::remove_from_sibling_list() {
   // remove receiver from sibling list
   instanceKlass* super = superklass();
   assert(super != NULL || as_klassOop() == 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);
   }
 }
 void Klass::follow_weak_klass_links( BoolObjectClosure* is_alive, OopClosure* keep_alive) {
   // This klass is alive but the subklass and siblings are not followed/updated.
   // We update the subklass link and the subklass' sibling links here.
   // Our own sibling link will be updated by our superclass (which must be alive
   // since we are).
   assert(is_alive->do_object_b(as_klassOop()), "just checking, this should be live");
   if (ClassUnloading) {
     klassOop sub = subklass_oop();
     if (sub != NULL && !is_alive->do_object_b(sub)) {
       // first subklass not alive, find first one alive
       do {
 #ifndef PRODUCT
         if (TraceClassUnloading && WizardMode) {
           ResourceMark rm;
           tty->print_cr("[Unlinking class (subclass) %s]", sub->klass_part()->external_name());
         }
 #endif
         sub = sub->klass_part()->next_sibling_oop();
       } while (sub != NULL && !is_alive->do_object_b(sub));
       set_subklass(sub);
     }
     // now update the subklass' sibling list
     while (sub != NULL) {
       klassOop next = sub->klass_part()->next_sibling_oop();
       if (next != NULL && !is_alive->do_object_b(next)) {
         // first sibling not alive, find first one alive
         do {
 #ifndef PRODUCT
           if (TraceClassUnloading && WizardMode) {
             ResourceMark rm;
             tty->print_cr("[Unlinking class (sibling) %s]", next->klass_part()->external_name());
           }
 #endif
           next = next->klass_part()->next_sibling_oop();
         } while (next != NULL && !is_alive->do_object_b(next));
         sub->klass_part()->set_next_sibling(next);
       }
       sub = next;
     }
   } else {
     // Always follow subklass and sibling link. This will prevent any klasses from
     // being unloaded (all classes are transitively linked from java.lang.Object).
     keep_alive->do_oop(adr_subklass());
     keep_alive->do_oop(adr_next_sibling());
   }
 }
 void Klass::remove_unshareable_info() {
   if (oop_is_instance()) {
     instanceKlass* ik = (instanceKlass*)this;
     if (ik->is_linked()) {
       ik->unlink_class();
     }
   }
   set_subklass(NULL);
   set_next_sibling(NULL);
 }
 klassOop 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);
 }
 klassOop 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);
 }
 klassOop Klass::array_klass_impl(bool or_null, int rank, TRAPS) {
   fatal("array_klass should be dispatched to instanceKlass, objArrayKlass or typeArrayKlass");
   return NULL;
 }
 klassOop 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(klassOop k)) {
   f(as_klassOop());
 }
 const char* Klass::external_name() const {
   if (oop_is_instance()) {
     instanceKlass* ik = (instanceKlass*) this;
     if (ik->is_anonymous()) {
       assert(AnonymousClasses, "");
       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::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::oop_verify_on(oop obj, outputStream* st) {
   guarantee(obj->is_oop(),  "should be oop");
   guarantee(obj->klass()->is_perm(),  "should be in permspace");
   guarantee(obj->klass()->is_klass(), "klass field is not a klass");
 }
 void Klass::oop_verify_old_oop(oop obj, oop* p, bool allow_dirty) {
   /* $$$ I think this functionality should be handled by verification of
   RememberedSet::verify_old_oop(obj, p, allow_dirty, false);
   the card table. */
 }
 void Klass::oop_verify_old_oop(oop obj, narrowOop* p, bool allow_dirty) { }
 #ifndef PRODUCT
 void Klass::verify_vtable_index(int i) {
   assert(oop_is_instance() || oop_is_array(), "only instanceKlass and arrayKlass have vtables");
   if (oop_is_instance()) {
     assert(i>=0 && i<((instanceKlass*)this)->vtable_length()/vtableEntry::size(), "index out of bounds");
   } else {
     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@8012aa3ccede (annotated)

src/share/vm/oops/klass.cpp