Mercurial > hg > graal-compiler
comparison src/share/vm/oops/instanceRefKlass.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 37f87013dfd8 |
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1 /* | |
2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // An instanceRefKlass is a specialized instanceKlass for Java | |
26 // classes that are subclasses of java/lang/ref/Reference. | |
27 // | |
28 // These classes are used to implement soft/weak/final/phantom | |
29 // references and finalization, and need special treatment by the | |
30 // garbage collector. | |
31 // | |
32 // During GC discovered reference objects are added (chained) to one | |
33 // of the four lists below, depending on the type of reference. | |
34 // The linked occurs through the next field in class java/lang/ref/Reference. | |
35 // | |
36 // Afterwards, the discovered references are processed in decreasing | |
37 // order of reachability. Reference objects eligible for notification | |
38 // are linked to the static pending_list in class java/lang/ref/Reference, | |
39 // and the pending list lock object in the same class is notified. | |
40 | |
41 | |
42 class instanceRefKlass: public instanceKlass { | |
43 public: | |
44 // Type testing | |
45 bool oop_is_instanceRef() const { return true; } | |
46 | |
47 // Casting from klassOop | |
48 static instanceRefKlass* cast(klassOop k) { | |
49 assert(k->klass_part()->oop_is_instanceRef(), "cast to instanceRefKlass"); | |
50 return (instanceRefKlass*) k->klass_part(); | |
51 } | |
52 | |
53 // allocation | |
54 DEFINE_ALLOCATE_PERMANENT(instanceRefKlass); | |
55 | |
56 // Garbage collection | |
57 int oop_adjust_pointers(oop obj); | |
58 void oop_follow_contents(oop obj); | |
59 | |
60 // Parallel Scavenge and Parallel Old | |
61 PARALLEL_GC_DECLS | |
62 | |
63 int oop_oop_iterate(oop obj, OopClosure* blk) { | |
64 return oop_oop_iterate_v(obj, blk); | |
65 } | |
66 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
67 return oop_oop_iterate_v_m(obj, blk, mr); | |
68 } | |
69 | |
70 #define InstanceRefKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ | |
71 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ | |
72 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr); | |
73 | |
74 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DECL) | |
75 ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DECL) | |
76 | |
77 static void release_and_notify_pending_list_lock(BasicLock *pending_list_basic_lock); | |
78 static void acquire_pending_list_lock(BasicLock *pending_list_basic_lock); | |
79 | |
80 // Update non-static oop maps so 'referent', 'nextPending' and | |
81 // 'discovered' will look like non-oops | |
82 static void update_nonstatic_oop_maps(klassOop k); | |
83 | |
84 public: | |
85 // Verification | |
86 void oop_verify_on(oop obj, outputStream* st); | |
87 }; |