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annotate src/share/vm/oops/instanceRefKlass.hpp @ 21836:b517d3a9aebf jdk8u31-b31
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author | asaha |
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date | Thu, 18 Dec 2014 14:30:02 -0800 |
parents | 55fb97c4c58d |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |
26 #define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP | |
27 | |
28 #include "oops/instanceKlass.hpp" | |
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29 #include "utilities/macros.hpp" |
1972 | 30 |
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31 // An InstanceRefKlass is a specialized InstanceKlass for Java |
0 | 32 // classes that are subclasses of java/lang/ref/Reference. |
33 // | |
34 // These classes are used to implement soft/weak/final/phantom | |
35 // references and finalization, and need special treatment by the | |
36 // garbage collector. | |
37 // | |
38 // During GC discovered reference objects are added (chained) to one | |
39 // of the four lists below, depending on the type of reference. | |
40 // The linked occurs through the next field in class java/lang/ref/Reference. | |
41 // | |
42 // Afterwards, the discovered references are processed in decreasing | |
43 // order of reachability. Reference objects eligible for notification | |
44 // are linked to the static pending_list in class java/lang/ref/Reference, | |
45 // and the pending list lock object in the same class is notified. | |
46 | |
47 | |
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48 class InstanceRefKlass: public InstanceKlass { |
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49 friend class InstanceKlass; |
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50 |
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51 // Constructor |
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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) |
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53 : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {} |
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54 |
0 | 55 public: |
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56 InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
0 | 57 // Type testing |
58 bool oop_is_instanceRef() const { return true; } | |
59 | |
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60 // Casting from Klass* |
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61 static InstanceRefKlass* cast(Klass* k) { |
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62 assert(k->oop_is_instanceRef(), "cast to InstanceRefKlass"); |
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63 return (InstanceRefKlass*) k; |
0 | 64 } |
65 | |
66 // Garbage collection | |
67 int oop_adjust_pointers(oop obj); | |
68 void oop_follow_contents(oop obj); | |
69 | |
70 // Parallel Scavenge and Parallel Old | |
71 PARALLEL_GC_DECLS | |
72 | |
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73 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) { |
0 | 74 return oop_oop_iterate_v(obj, blk); |
75 } | |
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76 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) { |
0 | 77 return oop_oop_iterate_v_m(obj, blk, mr); |
78 } | |
79 | |
80 #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
81 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ | |
82 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); | |
83 | |
84 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL) | |
342 | 85 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DECL) |
86 | |
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87 #if INCLUDE_ALL_GCS |
342 | 88 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
89 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); | |
90 | |
91 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) | |
92 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) | |
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93 #endif // INCLUDE_ALL_GCS |
0 | 94 |
95 static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock); | |
96 static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock); | |
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97 static bool owns_pending_list_lock(JavaThread* thread); |
0 | 98 |
99 // Update non-static oop maps so 'referent', 'nextPending' and | |
100 // 'discovered' will look like non-oops | |
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101 static void update_nonstatic_oop_maps(Klass* k); |
0 | 102 |
103 public: | |
104 // Verification | |
105 void oop_verify_on(oop obj, outputStream* st); | |
106 }; | |
1972 | 107 |
108 #endif // SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |