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/*
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* Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// An instanceRefKlass is a specialized instanceKlass for Java
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// classes that are subclasses of java/lang/ref/Reference.
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//
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// These classes are used to implement soft/weak/final/phantom
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// references and finalization, and need special treatment by the
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// garbage collector.
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//
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// During GC discovered reference objects are added (chained) to one
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// of the four lists below, depending on the type of reference.
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// The linked occurs through the next field in class java/lang/ref/Reference.
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//
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// Afterwards, the discovered references are processed in decreasing
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// order of reachability. Reference objects eligible for notification
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// are linked to the static pending_list in class java/lang/ref/Reference,
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// and the pending list lock object in the same class is notified.
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class instanceRefKlass: public instanceKlass {
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public:
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// Type testing
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bool oop_is_instanceRef() const { return true; }
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// Casting from klassOop
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static instanceRefKlass* cast(klassOop k) {
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assert(k->klass_part()->oop_is_instanceRef(), "cast to instanceRefKlass");
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return (instanceRefKlass*) k->klass_part();
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}
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// allocation
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DEFINE_ALLOCATE_PERMANENT(instanceRefKlass);
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// Garbage collection
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int oop_adjust_pointers(oop obj);
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void oop_follow_contents(oop obj);
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// Parallel Scavenge and Parallel Old
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PARALLEL_GC_DECLS
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int oop_oop_iterate(oop obj, OopClosure* blk) {
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return oop_oop_iterate_v(obj, blk);
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}
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int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
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return oop_oop_iterate_v_m(obj, blk, mr);
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}
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#define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
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int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
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int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
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ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
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#ifndef SERIALGC
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#define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
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int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
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ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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#endif // !SERIALGC
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static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock);
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static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock);
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// Update non-static oop maps so 'referent', 'nextPending' and
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// 'discovered' will look like non-oops
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static void update_nonstatic_oop_maps(klassOop k);
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public:
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// Verification
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void oop_verify_on(oop obj, outputStream* st);
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};
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