Mercurial > hg > truffle

comparison src/share/vm/oops/instanceMirrorKlass.hpp @ 2376:c7f3d0b4570f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7017732: move static fields into Class to prepare for perm gen removal Reviewed-by: kvn, coleenp, twisti, stefank
author never
date Fri, 18 Mar 2011 16:00:34 -0700
parents
children 63997f575155
comparison
equal deleted inserted replaced
2375:d673ef06fe96 2376:c7f3d0b4570f
1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
27
28 #include "oops/instanceKlass.hpp"
29
30 // An instanceMirrorKlass is a specialized instanceKlass for
31 // java.lang.Class instances. These instances are special because
32 // they contain the static fields of the class in addition to the
33 // normal fields of Class. This means they are variable sized
34 // instances and need special logic for computing their size and for
35 // iteration of their oops.
36
37
38 class instanceMirrorKlass: public instanceKlass {
39 private:
40 static int _offset_of_static_fields;
41
42 public:
43 // Type testing
44 bool oop_is_instanceMirror() const { return true; }
45
46 // Casting from klassOop
47 static instanceMirrorKlass* cast(klassOop k) {
48 assert(k->klass_part()->oop_is_instanceMirror(), "cast to instanceMirrorKlass");
49 return (instanceMirrorKlass*) k->klass_part();
50 }
51
52 // Returns the size of the instance including the extra static fields.
53 virtual int oop_size(oop obj) const;
54
55 // Static field offset is an offset into the Heap, should be converted by
56 // based on UseCompressedOop for traversal
57 static HeapWord* start_of_static_fields(oop obj) {
58 return (HeapWord*)((intptr_t)obj + offset_of_static_fields());
59 }
60
61 static void init_offset_of_static_fields() {
62 // Cache the offset of the static fields in the Class instance
63 assert(_offset_of_static_fields == 0, "once");
64 _offset_of_static_fields = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;
65 }
66
67 static int offset_of_static_fields() {
68 return _offset_of_static_fields;
69 }
70
71 int compute_static_oop_field_count(oop obj);
72
73 // Given a Klass return the size of the instance
74 int instance_size(KlassHandle k);
75
76 // allocation
77 DEFINE_ALLOCATE_PERMANENT(instanceMirrorKlass);
78 instanceOop allocate_instance(KlassHandle k, TRAPS);
79
80 // Garbage collection
81 int oop_adjust_pointers(oop obj);
82 void oop_follow_contents(oop obj);
83
84 // Parallel Scavenge and Parallel Old
85 PARALLEL_GC_DECLS
86
87 int oop_oop_iterate(oop obj, OopClosure* blk) {
88 return oop_oop_iterate_v(obj, blk);
89 }
90 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
91 return oop_oop_iterate_v_m(obj, blk, mr);
92 }
93
94 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
95 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
96 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
97
98 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
99 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
100
101 #ifndef SERIALGC
102 #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
103 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
104
105 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
106 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
107 #endif // !SERIALGC
108 };
109
110 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP