1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/instanceRefKlass.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,108 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
1.29 +#define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
1.30 +
1.31 +#include "oops/instanceKlass.hpp"
1.32 +#include "utilities/macros.hpp"
1.33 +
1.34 +// An InstanceRefKlass is a specialized InstanceKlass for Java
1.35 +// classes that are subclasses of java/lang/ref/Reference.
1.36 +//
1.37 +// These classes are used to implement soft/weak/final/phantom
1.38 +// references and finalization, and need special treatment by the
1.39 +// garbage collector.
1.40 +//
1.41 +// During GC discovered reference objects are added (chained) to one
1.42 +// of the four lists below, depending on the type of reference.
1.43 +// The linked occurs through the next field in class java/lang/ref/Reference.
1.44 +//
1.45 +// Afterwards, the discovered references are processed in decreasing
1.46 +// order of reachability. Reference objects eligible for notification
1.47 +// are linked to the static pending_list in class java/lang/ref/Reference,
1.48 +// and the pending list lock object in the same class is notified.
1.49 +
1.50 +
1.51 +class InstanceRefKlass: public InstanceKlass {
1.52 + friend class InstanceKlass;
1.53 +
1.54 + // Constructor
1.55 + InstanceRefKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous)
1.56 + : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}
1.57 +
1.58 + public:
1.59 + InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
1.60 + // Type testing
1.61 + bool oop_is_instanceRef() const { return true; }
1.62 +
1.63 + // Casting from Klass*
1.64 + static InstanceRefKlass* cast(Klass* k) {
1.65 + assert(k->oop_is_instanceRef(), "cast to InstanceRefKlass");
1.66 + return (InstanceRefKlass*) k;
1.67 + }
1.68 +
1.69 + // Garbage collection
1.70 + int oop_adjust_pointers(oop obj);
1.71 + void oop_follow_contents(oop obj);
1.72 +
1.73 + // Parallel Scavenge and Parallel Old
1.74 + PARALLEL_GC_DECLS
1.75 +
1.76 + int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
1.77 + return oop_oop_iterate_v(obj, blk);
1.78 + }
1.79 + int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
1.80 + return oop_oop_iterate_v_m(obj, blk, mr);
1.81 + }
1.82 +
1.83 +#define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
1.84 + int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
1.85 + int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
1.86 +
1.87 + ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
1.88 + ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL)
1.89 +
1.90 +#if INCLUDE_ALL_GCS
1.91 +#define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
1.92 + int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
1.93 +
1.94 + ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1.95 + ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1.96 +#endif // INCLUDE_ALL_GCS
1.97 +
1.98 + static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock);
1.99 + static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock);
1.100 + static bool owns_pending_list_lock(JavaThread* thread);
1.101 +
1.102 + // Update non-static oop maps so 'referent', 'nextPending' and
1.103 + // 'discovered' will look like non-oops
1.104 + static void update_nonstatic_oop_maps(Klass* k);
1.105 +
1.106 + public:
1.107 + // Verification
1.108 + void oop_verify_on(oop obj, outputStream* st);
1.109 +};
1.110 +
1.111 +#endif // SHARE_VM_OOPS_INSTANCEREFKLASS_HPP
