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src/share/vm/oops/instanceRefKlass.hpp@624a0741915c (annotated)
src/share/vm/oops/instanceRefKlass.hpp
Thu, 04 Apr 2019 17:56:29 +0800
- author
- aoqi
- date
- Thu, 04 Apr 2019 17:56:29 +0800
- changeset 9572
- 624a0741915c
- parent 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
Merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |
| aoqi@0 | 26 | #define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "oops/instanceKlass.hpp" |
| aoqi@0 | 29 | #include "utilities/macros.hpp" |
| aoqi@0 | 30 | |
| aoqi@0 | 31 | // An InstanceRefKlass is a specialized InstanceKlass for Java |
| aoqi@0 | 32 | // classes that are subclasses of java/lang/ref/Reference. |
| aoqi@0 | 33 | // |
| aoqi@0 | 34 | // These classes are used to implement soft/weak/final/phantom |
| aoqi@0 | 35 | // references and finalization, and need special treatment by the |
| aoqi@0 | 36 | // garbage collector. |
| aoqi@0 | 37 | // |
| aoqi@0 | 38 | // During GC discovered reference objects are added (chained) to one |
| aoqi@0 | 39 | // of the four lists below, depending on the type of reference. |
| aoqi@0 | 40 | // The linked occurs through the next field in class java/lang/ref/Reference. |
| aoqi@0 | 41 | // |
| aoqi@0 | 42 | // Afterwards, the discovered references are processed in decreasing |
| aoqi@0 | 43 | // order of reachability. Reference objects eligible for notification |
| aoqi@0 | 44 | // are linked to the static pending_list in class java/lang/ref/Reference, |
| aoqi@0 | 45 | // and the pending list lock object in the same class is notified. |
| aoqi@0 | 46 | |
| aoqi@0 | 47 | |
| aoqi@0 | 48 | class InstanceRefKlass: public InstanceKlass { |
| aoqi@0 | 49 | friend class InstanceKlass; |
| aoqi@0 | 50 | |
| aoqi@0 | 51 | // Constructor |
| aoqi@0 | 52 | InstanceRefKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags, bool is_anonymous) |
| aoqi@0 | 53 | : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {} |
| aoqi@0 | 54 | |
| aoqi@0 | 55 | public: |
| aoqi@0 | 56 | InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
| aoqi@0 | 57 | // Type testing |
| aoqi@0 | 58 | bool oop_is_instanceRef() const { return true; } |
| aoqi@0 | 59 | |
| aoqi@0 | 60 | // Casting from Klass* |
| aoqi@0 | 61 | static InstanceRefKlass* cast(Klass* k) { |
| aoqi@0 | 62 | assert(k->oop_is_instanceRef(), "cast to InstanceRefKlass"); |
| aoqi@0 | 63 | return (InstanceRefKlass*) k; |
| aoqi@0 | 64 | } |
| aoqi@0 | 65 | |
| aoqi@0 | 66 | // Garbage collection |
| aoqi@0 | 67 | int oop_adjust_pointers(oop obj); |
| aoqi@0 | 68 | void oop_follow_contents(oop obj); |
| aoqi@0 | 69 | |
| aoqi@0 | 70 | // Parallel Scavenge and Parallel Old |
| aoqi@0 | 71 | PARALLEL_GC_DECLS |
| aoqi@0 | 72 | |
| aoqi@0 | 73 | int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { |
| aoqi@0 | 74 | return oop_oop_iterate_v(obj, blk); |
| aoqi@0 | 75 | } |
| aoqi@0 | 76 | int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
| aoqi@0 | 77 | return oop_oop_iterate_v_m(obj, blk, mr); |
| aoqi@0 | 78 | } |
| aoqi@0 | 79 | |
| aoqi@0 | 80 | #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
| aoqi@0 | 81 | int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
| aoqi@0 | 82 | int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); |
| aoqi@0 | 83 | |
| aoqi@0 | 84 | ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL) |
| aoqi@0 | 85 | ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL) |
| aoqi@0 | 86 | |
| aoqi@0 | 87 | #if INCLUDE_ALL_GCS |
| aoqi@0 | 88 | #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
| aoqi@0 | 89 | int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
| aoqi@0 | 90 | |
| aoqi@0 | 91 | ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
| aoqi@0 | 92 | ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
| aoqi@0 | 93 | #endif // INCLUDE_ALL_GCS |
| aoqi@0 | 94 | |
| aoqi@0 | 95 | static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock); |
| aoqi@0 | 96 | static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock); |
| aoqi@0 | 97 | static bool owns_pending_list_lock(JavaThread* thread); |
| aoqi@0 | 98 | |
| aoqi@0 | 99 | // Update non-static oop maps so 'referent', 'nextPending' and |
| aoqi@0 | 100 | // 'discovered' will look like non-oops |
| aoqi@0 | 101 | static void update_nonstatic_oop_maps(Klass* k); |
| aoqi@0 | 102 | |
| aoqi@0 | 103 | public: |
| aoqi@0 | 104 | // Verification |
| aoqi@0 | 105 | void oop_verify_on(oop obj, outputStream* st); |
| aoqi@0 | 106 | }; |
| aoqi@0 | 107 | |
| aoqi@0 | 108 | #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |
