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

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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
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children 63997f575155
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
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26 #define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
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27
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28 #include "oops/instanceKlass.hpp"
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29
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30 // An instanceMirrorKlass is a specialized instanceKlass for
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31 // java.lang.Class instances. These instances are special because
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32 // they contain the static fields of the class in addition to the
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33 // normal fields of Class. This means they are variable sized
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34 // instances and need special logic for computing their size and for
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35 // iteration of their oops.
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36
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37
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38 class instanceMirrorKlass: public instanceKlass {
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39 private:
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40 static int _offset_of_static_fields;
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41
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42 public:
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43 // Type testing
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44 bool oop_is_instanceMirror() const { return true; }
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45
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46 // Casting from klassOop
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47 static instanceMirrorKlass* cast(klassOop k) {
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48 assert(k->klass_part()->oop_is_instanceMirror(), "cast to instanceMirrorKlass");
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49 return (instanceMirrorKlass*) k->klass_part();
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50 }
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51
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52 // Returns the size of the instance including the extra static fields.
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53 virtual int oop_size(oop obj) const;
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54
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55 // Static field offset is an offset into the Heap, should be converted by
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56 // based on UseCompressedOop for traversal
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57 static HeapWord* start_of_static_fields(oop obj) {
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58 return (HeapWord*)((intptr_t)obj + offset_of_static_fields());
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59 }
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60
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61 static void init_offset_of_static_fields() {
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62 // Cache the offset of the static fields in the Class instance
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63 assert(_offset_of_static_fields == 0, "once");
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64 _offset_of_static_fields = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;
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65 }
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66
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67 static int offset_of_static_fields() {
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68 return _offset_of_static_fields;
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69 }
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70
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71 int compute_static_oop_field_count(oop obj);
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72
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73 // Given a Klass return the size of the instance
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74 int instance_size(KlassHandle k);
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75
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76 // allocation
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77 DEFINE_ALLOCATE_PERMANENT(instanceMirrorKlass);
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78 instanceOop allocate_instance(KlassHandle k, TRAPS);
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79
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80 // Garbage collection
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81 int oop_adjust_pointers(oop obj);
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82 void oop_follow_contents(oop obj);
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83
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84 // Parallel Scavenge and Parallel Old
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85 PARALLEL_GC_DECLS
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86
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87 int oop_oop_iterate(oop obj, OopClosure* blk) {
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88 return oop_oop_iterate_v(obj, blk);
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89 }
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90 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
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91 return oop_oop_iterate_v_m(obj, blk, mr);
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92 }
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93
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94 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
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95 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
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96 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
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97
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98 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
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99 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
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100
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101 #ifndef SERIALGC
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102 #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
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103 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
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104
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105 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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106 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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107 #endif // !SERIALGC
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108 };
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109
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110 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP