1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/instanceRefKlass.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,87 @@
1.4 +/*
1.5 + * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// An instanceRefKlass is a specialized instanceKlass for Java
1.29 +// classes that are subclasses of java/lang/ref/Reference.
1.30 +//
1.31 +// These classes are used to implement soft/weak/final/phantom
1.32 +// references and finalization, and need special treatment by the
1.33 +// garbage collector.
1.34 +//
1.35 +// During GC discovered reference objects are added (chained) to one
1.36 +// of the four lists below, depending on the type of reference.
1.37 +// The linked occurs through the next field in class java/lang/ref/Reference.
1.38 +//
1.39 +// Afterwards, the discovered references are processed in decreasing
1.40 +// order of reachability. Reference objects eligible for notification
1.41 +// are linked to the static pending_list in class java/lang/ref/Reference,
1.42 +// and the pending list lock object in the same class is notified.
1.43 +
1.44 +
1.45 +class instanceRefKlass: public instanceKlass {
1.46 + public:
1.47 + // Type testing
1.48 + bool oop_is_instanceRef() const { return true; }
1.49 +
1.50 + // Casting from klassOop
1.51 + static instanceRefKlass* cast(klassOop k) {
1.52 + assert(k->klass_part()->oop_is_instanceRef(), "cast to instanceRefKlass");
1.53 + return (instanceRefKlass*) k->klass_part();
1.54 + }
1.55 +
1.56 + // allocation
1.57 + DEFINE_ALLOCATE_PERMANENT(instanceRefKlass);
1.58 +
1.59 + // Garbage collection
1.60 + int oop_adjust_pointers(oop obj);
1.61 + void oop_follow_contents(oop obj);
1.62 +
1.63 + // Parallel Scavenge and Parallel Old
1.64 + PARALLEL_GC_DECLS
1.65 +
1.66 + int oop_oop_iterate(oop obj, OopClosure* blk) {
1.67 + return oop_oop_iterate_v(obj, blk);
1.68 + }
1.69 + int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
1.70 + return oop_oop_iterate_v_m(obj, blk, mr);
1.71 + }
1.72 +
1.73 +#define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
1.74 + int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
1.75 + int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
1.76 +
1.77 + ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
1.78 + ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
1.79 +
1.80 + static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock);
1.81 + static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock);
1.82 +
1.83 + // Update non-static oop maps so 'referent', 'nextPending' and
1.84 + // 'discovered' will look like non-oops
1.85 + static void update_nonstatic_oop_maps(klassOop k);
1.86 +
1.87 + public:
1.88 + // Verification
1.89 + void oop_verify_on(oop obj, outputStream* st);
1.90 +};
