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annotate src/share/vm/classfile/loaderConstraints.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
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1 /*
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2 * Copyright (c) 2003, 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_CLASSFILE_LOADERCONSTRAINTS_HPP
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26 #define SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP
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27
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28 #include "classfile/dictionary.hpp"
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29 #include "classfile/placeholders.hpp"
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30 #include "utilities/hashtable.hpp"
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31
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32 class LoaderConstraintEntry;
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33 class Symbol;
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34
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35 class LoaderConstraintTable : public Hashtable<Klass*, mtClass> {
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36 friend class VMStructs;
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37 private:
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38
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39 enum Constants {
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40 _loader_constraint_size = 107, // number of entries in constraint table
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41 _nof_buckets = 1009 // number of buckets in hash table
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42 };
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43
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44 LoaderConstraintEntry** find_loader_constraint(Symbol* name,
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45 Handle loader);
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47 public:
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48
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49 LoaderConstraintTable(int nof_buckets);
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50
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51 LoaderConstraintEntry* new_entry(unsigned int hash, Symbol* name,
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52 Klass* klass, int num_loaders,
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53 int max_loaders);
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54 void free_entry(LoaderConstraintEntry *entry);
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55
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56 LoaderConstraintEntry* bucket(int i) {
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57 return (LoaderConstraintEntry*)Hashtable<Klass*, mtClass>::bucket(i);
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58 }
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59
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60 LoaderConstraintEntry** bucket_addr(int i) {
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61 return (LoaderConstraintEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i);
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62 }
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63
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64 // Enhanced Class Redefinition support
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65 void classes_do(KlassClosure* f);
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66
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67 // Check class loader constraints
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68 bool add_entry(Symbol* name, Klass* klass1, Handle loader1,
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69 Klass* klass2, Handle loader2);
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70
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71 // Note: The main entry point for this module is via SystemDictionary.
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72 // SystemDictionary::check_signature_loaders(Symbol* signature,
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73 // Handle loader1, Handle loader2,
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74 // bool is_method, TRAPS)
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75
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76 Klass* find_constrained_klass(Symbol* name, Handle loader);
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77
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78 // Class loader constraints
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79
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80 void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
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81 void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
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82 Klass* klass);
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83 void merge_loader_constraints(LoaderConstraintEntry** pp1,
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84 LoaderConstraintEntry** pp2, Klass* klass);
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85
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86 bool check_or_update(instanceKlassHandle k, Handle loader,
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87 Symbol* name);
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90 void purge_loader_constraints();
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91
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92 void verify(Dictionary* dictionary, PlaceholderTable* placeholders);
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93 #ifndef PRODUCT
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94 void print();
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95 #endif
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96 };
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97
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98 class LoaderConstraintEntry : public HashtableEntry<Klass*, mtClass> {
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99 friend class VMStructs;
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100 private:
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101 Symbol* _name; // class name
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102 int _num_loaders;
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103 int _max_loaders;
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104 // Loader constraints enforce correct linking behavior.
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105 // Thus, it really operates on ClassLoaderData which represents linking domain,
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106 // not class loaders.
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107 ClassLoaderData** _loaders; // initiating loaders
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108
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109 public:
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110
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111 Klass* klass() { return literal(); }
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112 Klass** klass_addr() { return literal_addr(); }
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113 void set_klass(Klass* k) { set_literal(k); }
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114
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115 LoaderConstraintEntry* next() {
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116 return (LoaderConstraintEntry*)HashtableEntry<Klass*, mtClass>::next();
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117 }
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118
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119 LoaderConstraintEntry** next_addr() {
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120 return (LoaderConstraintEntry**)HashtableEntry<Klass*, mtClass>::next_addr();
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121 }
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122 void set_next(LoaderConstraintEntry* next) {
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123 HashtableEntry<Klass*, mtClass>::set_next(next);
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124 }
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125
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126 Symbol* name() { return _name; }
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127 void set_name(Symbol* name) {
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128 _name = name;
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129 if (name != NULL) name->increment_refcount();
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130 }
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132 int num_loaders() { return _num_loaders; }
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133 void set_num_loaders(int i) { _num_loaders = i; }
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134
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135 int max_loaders() { return _max_loaders; }
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136 void set_max_loaders(int i) { _max_loaders = i; }
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137
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138 ClassLoaderData** loaders() { return _loaders; }
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139 void set_loaders(ClassLoaderData** loaders) { _loaders = loaders; }
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140
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141 ClassLoaderData* loader_data(int i) { return _loaders[i]; }
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142 void set_loader_data(int i, ClassLoaderData* p) { _loaders[i] = p; }
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143 // convenience
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144 void set_loader(int i, oop p);
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145 };
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146
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147 #endif // SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP