| /* |
| * Copyright (c) 1997, 2013, 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |
| #define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |
| |
| #include "oops/instanceKlass.hpp" |
| #include "utilities/macros.hpp" |
| |
| // An InstanceRefKlass is a specialized InstanceKlass for Java |
| // classes that are subclasses of java/lang/ref/Reference. |
| // |
| // These classes are used to implement soft/weak/final/phantom |
| // references and finalization, and need special treatment by the |
| // garbage collector. |
| // |
| // During GC discovered reference objects are added (chained) to one |
| // of the four lists below, depending on the type of reference. |
| // The linked occurs through the next field in class java/lang/ref/Reference. |
| // |
| // Afterwards, the discovered references are processed in decreasing |
| // order of reachability. Reference objects eligible for notification |
| // are linked to the static pending_list in class java/lang/ref/Reference, |
| // and the pending list lock object in the same class is notified. |
| |
| |
| class InstanceRefKlass: public InstanceKlass { |
| friend class InstanceKlass; |
| |
| // Constructor |
| InstanceRefKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous) |
| : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {} |
| |
| public: |
| InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
| // Type testing |
| bool oop_is_instanceRef() const { return true; } |
| |
| // Casting from Klass* |
| static InstanceRefKlass* cast(Klass* k) { |
| assert(k->oop_is_instanceRef(), "cast to InstanceRefKlass"); |
| return (InstanceRefKlass*) k; |
| } |
| |
| // Garbage collection |
| int oop_adjust_pointers(oop obj); |
| void oop_follow_contents(oop obj); |
| |
| // Parallel Scavenge and Parallel Old |
| PARALLEL_GC_DECLS |
| |
| int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { |
| return oop_oop_iterate_v(obj, blk); |
| } |
| int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
| return oop_oop_iterate_v_m(obj, blk, mr); |
| } |
| |
| #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
| int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
| int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); |
| |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL) |
| |
| #if INCLUDE_ALL_GCS |
| #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
| int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
| |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
| #endif // INCLUDE_ALL_GCS |
| |
| static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock); |
| static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock); |
| static bool owns_pending_list_lock(JavaThread* thread); |
| |
| // Update non-static oop maps so 'referent', 'nextPending' and |
| // 'discovered' will look like non-oops |
| static void update_nonstatic_oop_maps(Klass* k); |
| |
| public: |
| // Verification |
| void oop_verify_on(oop obj, outputStream* st); |
| }; |
| |
| #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |