Mercurial > hg > truffle
annotate src/share/vm/oops/instanceMirrorKlass.hpp @ 2376:c7f3d0b4570f
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Reviewed-by: kvn, coleenp, twisti, stefank
author | never |
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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 |