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annotate src/share/vm/oops/instanceMirrorKlass.hpp @ 9126:bc26f978b0ce

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HotSpotResolvedObjectType: implement hasFinalizeSubclass() correctly don't use the (wrong) cached value, but ask the runtime on each request. Fixes regression on xml.* benchmarks @ specjvm2008. The problem was: After the constructor of Object was deoptimized due to an assumption violation, it was recompiled again after some time. However, on recompilation, the value of hasFinalizeSubclass for the class was not updated and it was compiled again with a, now wrong, assumption, which then triggers deoptimization again. This was repeated until it hit the recompilation limit (defined by PerMethodRecompilationCutoff), and therefore only executed by the interpreter from now on, causing the performance regression.
author Bernhard Urban <bernhard.urban@jku.at>
date Mon, 15 Apr 2013 19:54:58 +0200
parents db9981fd3124
children 190899198332
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1 /*
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2 * Copyright (c) 2011, 2012, 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 "classfile/systemDictionary.hpp"
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29 #include "oops/instanceKlass.hpp"
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30 #include "runtime/handles.hpp"
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31 #include "utilities/macros.hpp"
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32
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33 // An InstanceMirrorKlass is a specialized InstanceKlass for
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34 // java.lang.Class instances. These instances are special because
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35 // they contain the static fields of the class in addition to the
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36 // normal fields of Class. This means they are variable sized
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37 // instances and need special logic for computing their size and for
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38 // iteration of their oops.
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39
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40
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41 class InstanceMirrorKlass: public InstanceKlass {
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42 friend class VMStructs;
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43 friend class InstanceKlass;
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44
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45 private:
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46 static int _offset_of_static_fields;
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47
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48 // Constructor
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49 InstanceMirrorKlass(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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50 : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}
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51
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52 public:
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53 InstanceMirrorKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
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54 // Type testing
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55 bool oop_is_instanceMirror() const { return true; }
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56
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57 // Casting from Klass*
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58 static InstanceMirrorKlass* cast(Klass* k) {
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59 assert(k->oop_is_instanceMirror(), "cast to InstanceMirrorKlass");
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60 return (InstanceMirrorKlass*) k;
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61 }
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62
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63 // Returns the size of the instance including the extra static fields.
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64 virtual int oop_size(oop obj) const;
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65
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66 // Static field offset is an offset into the Heap, should be converted by
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67 // based on UseCompressedOop for traversal
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68 static HeapWord* start_of_static_fields(oop obj) {
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69 return (HeapWord*)((intptr_t)obj + offset_of_static_fields());
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70 }
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71
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72 static void init_offset_of_static_fields() {
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73 // Cache the offset of the static fields in the Class instance
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74 assert(_offset_of_static_fields == 0, "once");
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75 _offset_of_static_fields = InstanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;
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76 }
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77
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78 static int offset_of_static_fields() {
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79 return _offset_of_static_fields;
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80 }
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81
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82 int compute_static_oop_field_count(oop obj);
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83
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84 // Given a Klass return the size of the instance
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85 int instance_size(KlassHandle k);
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86
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87 // allocation
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88 instanceOop allocate_instance(KlassHandle k, TRAPS);
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89
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90 // Garbage collection
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91 int oop_adjust_pointers(oop obj);
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92 void oop_follow_contents(oop obj);
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93
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94 // Parallel Scavenge and Parallel Old
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95 PARALLEL_GC_DECLS
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96
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97 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
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98 return oop_oop_iterate_v(obj, blk);
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99 }
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100 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
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101 return oop_oop_iterate_v_m(obj, blk, mr);
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102 }
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103
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104 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
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105 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
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106 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
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107
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108 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
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109 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
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110
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111 #if INCLUDE_ALL_GCS
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112 #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
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113 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
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114
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115 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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116 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
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117 #endif // INCLUDE_ALL_GCS
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118 };
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119
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120 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP