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annotate src/share/vm/classfile/dictionary.hpp @ 6866:633ba56cb013

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Merge
author jmasa
date Wed, 17 Oct 2012 13:59:57 -0700
parents da91efe96a93
children 43083e670adf
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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_DICTIONARY_HPP
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26 #define SHARE_VM_CLASSFILE_DICTIONARY_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 "oops/oop.hpp"
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31 #include "utilities/hashtable.hpp"
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32
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33 class DictionaryEntry;
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34 class PSPromotionManager;
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35
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36 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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37 // The data structure for the system dictionary (and the shared system
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38 // dictionary).
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39
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40 class Dictionary : public TwoOopHashtable<Klass*, mtClass> {
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41 friend class VMStructs;
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42 private:
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43 // current iteration index.
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44 static int _current_class_index;
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45 // pointer to the current hash table entry.
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46 static DictionaryEntry* _current_class_entry;
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47
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48 DictionaryEntry* get_entry(int index, unsigned int hash,
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49 Symbol* name, ClassLoaderData* loader_data);
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50
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51 DictionaryEntry* bucket(int i) {
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52 return (DictionaryEntry*)Hashtable<Klass*, mtClass>::bucket(i);
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53 }
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54
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55 // The following method is not MT-safe and must be done under lock.
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56 DictionaryEntry** bucket_addr(int i) {
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57 return (DictionaryEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i);
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58 }
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59
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60 void add_entry(int index, DictionaryEntry* new_entry) {
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61 Hashtable<Klass*, mtClass>::add_entry(index, (HashtableEntry<Klass*, mtClass>*)new_entry);
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62 }
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63
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64 public:
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65 Dictionary(int table_size);
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66 Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries);
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67
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68 DictionaryEntry* new_entry(unsigned int hash, Klass* klass, ClassLoaderData* loader_data);
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70 DictionaryEntry* new_entry();
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71
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72 void free_entry(DictionaryEntry* entry);
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73
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74 void add_klass(Symbol* class_name, ClassLoaderData* loader_data,KlassHandle obj);
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75
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76 Klass* find_class(int index, unsigned int hash,
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77 Symbol* name, ClassLoaderData* loader_data);
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78
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79 Klass* find_shared_class(int index, unsigned int hash, Symbol* name);
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80
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81 // Compiler support
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82 Klass* try_get_next_class();
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83
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84 // GC support
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85 void oops_do(OopClosure* f);
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86 void always_strong_oops_do(OopClosure* blk);
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87
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88 void always_strong_classes_do(KlassClosure* closure);
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89
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90 void classes_do(void f(Klass*));
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91 void classes_do(void f(Klass*, TRAPS), TRAPS);
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92 void classes_do(void f(Klass*, ClassLoaderData*));
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93 void classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS);
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94
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95 void methods_do(void f(Method*));
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96
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97
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98 // Classes loaded by the bootstrap loader are always strongly reachable.
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99 // If we're not doing class unloading, all classes are strongly reachable.
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100 static bool is_strongly_reachable(ClassLoaderData* loader_data, Klass* klass) {
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101 assert (klass != NULL, "should have non-null klass");
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102 return (loader_data->is_the_null_class_loader_data() || !ClassUnloading);
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103 }
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104
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105 // Unload (that is, break root links to) all unmarked classes and
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106 // loaders. Returns "true" iff something was unloaded.
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107 bool do_unloading();
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108
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109 // Protection domains
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110 Klass* find(int index, unsigned int hash, Symbol* name,
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111 ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
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112 bool is_valid_protection_domain(int index, unsigned int hash,
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113 Symbol* name, ClassLoaderData* loader_data,
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114 Handle protection_domain);
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115 void add_protection_domain(int index, unsigned int hash,
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116 instanceKlassHandle klass, ClassLoaderData* loader_data,
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117 Handle protection_domain, TRAPS);
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118
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119 // Sharing support
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120 void reorder_dictionary();
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121
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122
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123 #ifndef PRODUCT
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124 void print();
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125 #endif
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126 void verify();
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127 };
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128
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129 // The following classes can be in dictionary.cpp, but we need these
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130 // to be in header file so that SA's vmStructs can access.
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131
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132 class ProtectionDomainEntry :public CHeapObj<mtClass> {
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133 friend class VMStructs;
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134 public:
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135 ProtectionDomainEntry* _next;
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136 oop _protection_domain;
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137
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138 ProtectionDomainEntry(oop protection_domain, ProtectionDomainEntry* next) {
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139 _protection_domain = protection_domain;
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140 _next = next;
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141 }
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142
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143 ProtectionDomainEntry* next() { return _next; }
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144 oop protection_domain() { return _protection_domain; }
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145 };
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146
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147 // An entry in the system dictionary, this describes a class as
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148 // { Klass*, loader, protection_domain }.
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149
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150 class DictionaryEntry : public HashtableEntry<Klass*, mtClass> {
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151 friend class VMStructs;
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152 private:
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153 // Contains the set of approved protection domains that can access
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154 // this system dictionary entry.
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155 ProtectionDomainEntry* _pd_set;
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156 ClassLoaderData* _loader_data;
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157
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158 public:
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159 // Tells whether a protection is in the approved set.
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160 bool contains_protection_domain(oop protection_domain) const;
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161 // Adds a protection domain to the approved set.
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162 void add_protection_domain(oop protection_domain);
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163
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164 Klass* klass() const { return (Klass*)literal(); }
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165 Klass** klass_addr() { return (Klass**)literal_addr(); }
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166
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167 DictionaryEntry* next() const {
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168 return (DictionaryEntry*)HashtableEntry<Klass*, mtClass>::next();
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169 }
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170
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171 DictionaryEntry** next_addr() {
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172 return (DictionaryEntry**)HashtableEntry<Klass*, mtClass>::next_addr();
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173 }
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174
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175 ClassLoaderData* loader_data() const { return _loader_data; }
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176 void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; }
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177
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178 ProtectionDomainEntry* pd_set() const { return _pd_set; }
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179 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; }
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180
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181 bool has_protection_domain() { return _pd_set != NULL; }
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182
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183 // Tells whether the initiating class' protection can access the this _klass
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184 bool is_valid_protection_domain(Handle protection_domain) {
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185 if (!ProtectionDomainVerification) return true;
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186 if (!SystemDictionary::has_checkPackageAccess()) return true;
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187
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188 return protection_domain() == NULL
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189 ? true
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190 : contains_protection_domain(protection_domain());
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191 }
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192
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193
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194 void protection_domain_set_oops_do(OopClosure* f) {
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195 for (ProtectionDomainEntry* current = _pd_set;
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196 current != NULL;
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197 current = current->_next) {
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198 f->do_oop(&(current->_protection_domain));
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199 }
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200 }
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201
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202 void verify_protection_domain_set() {
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203 for (ProtectionDomainEntry* current = _pd_set;
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204 current != NULL;
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205 current = current->_next) {
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206 current->_protection_domain->verify();
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207 }
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208 }
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209
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210 bool equals(Symbol* class_name, ClassLoaderData* loader_data) const {
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211 Klass* klass = (Klass*)literal();
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212 return (InstanceKlass::cast(klass)->name() == class_name &&
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213 _loader_data == loader_data);
0
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214 }
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215
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216 void print() {
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217 int count = 0;
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218 for (ProtectionDomainEntry* current = _pd_set;
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219 current != NULL;
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220 current = current->_next) {
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221 count++;
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222 }
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223 tty->print_cr("pd set = #%d", count);
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224 }
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225 };
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226
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227 // Entry in a SymbolPropertyTable, mapping a single Symbol*
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228 // to a managed and an unmanaged pointer.
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229 class SymbolPropertyEntry : public HashtableEntry<Symbol*, mtSymbol> {
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230 friend class VMStructs;
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231 private:
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232 intptr_t _symbol_mode; // secondary key
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233 Method* _method;
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234 oop _method_type;
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235
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236 public:
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237 Symbol* symbol() const { return literal(); }
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238
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239 intptr_t symbol_mode() const { return _symbol_mode; }
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240 void set_symbol_mode(intptr_t m) { _symbol_mode = m; }
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241
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242 Method* method() const { return _method; }
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243 void set_method(Method* p) { _method = p; }
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244
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245 oop method_type() const { return _method_type; }
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246 oop* method_type_addr() { return &_method_type; }
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247 void set_method_type(oop p) { _method_type = p; }
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248
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249 SymbolPropertyEntry* next() const {
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250 return (SymbolPropertyEntry*)HashtableEntry<Symbol*, mtSymbol>::next();
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251 }
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252
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253 SymbolPropertyEntry** next_addr() {
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254 return (SymbolPropertyEntry**)HashtableEntry<Symbol*, mtSymbol>::next_addr();
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255 }
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256
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257 void print_on(outputStream* st) const {
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258 symbol()->print_value_on(st);
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259 st->print("/mode="INTX_FORMAT, symbol_mode());
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260 st->print(" -> ");
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261 bool printed = false;
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262 if (method() != NULL) {
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263 method()->print_value_on(st);
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264 printed = true;
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265 }
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266 if (method_type() != NULL) {
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267 if (printed) st->print(" and ");
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268 st->print(INTPTR_FORMAT, method_type());
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269 printed = true;
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270 }
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271 st->print_cr(printed ? "" : "(empty)");
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272 }
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273 };
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274
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275 // A system-internal mapping of symbols to pointers, both managed
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276 // and unmanaged. Used to record the auto-generation of each method
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277 // MethodHandle.invoke(S)T, for all signatures (S)T.
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278 class SymbolPropertyTable : public Hashtable<Symbol*, mtSymbol> {
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279 friend class VMStructs;
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280 private:
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281 SymbolPropertyEntry* bucket(int i) {
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282 return (SymbolPropertyEntry*) Hashtable<Symbol*, mtSymbol>::bucket(i);
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283 }
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284
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285 // The following method is not MT-safe and must be done under lock.
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286 SymbolPropertyEntry** bucket_addr(int i) {
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287 return (SymbolPropertyEntry**) Hashtable<Symbol*, mtSymbol>::bucket_addr(i);
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288 }
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289
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290 void add_entry(int index, SymbolPropertyEntry* new_entry) {
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291 ShouldNotReachHere();
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292 }
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293 void set_entry(int index, SymbolPropertyEntry* new_entry) {
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294 ShouldNotReachHere();
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295 }
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296
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297 SymbolPropertyEntry* new_entry(unsigned int hash, Symbol* symbol, intptr_t symbol_mode) {
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298 SymbolPropertyEntry* entry = (SymbolPropertyEntry*) Hashtable<Symbol*, mtSymbol>::new_entry(hash, symbol);
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299 // Hashtable with Symbol* literal must increment and decrement refcount.
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300 symbol->increment_refcount();
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301 entry->set_symbol_mode(symbol_mode);
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302 entry->set_method(NULL);
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303 entry->set_method_type(NULL);
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304 return entry;
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305 }
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306
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307 public:
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308 SymbolPropertyTable(int table_size);
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309 SymbolPropertyTable(int table_size, HashtableBucket<mtSymbol>* t, int number_of_entries);
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310
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311 void free_entry(SymbolPropertyEntry* entry) {
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312 // decrement Symbol refcount here because hashtable doesn't.
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313 entry->literal()->decrement_refcount();
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314 Hashtable<Symbol*, mtSymbol>::free_entry(entry);
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315 }
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316
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317 unsigned int compute_hash(Symbol* sym, intptr_t symbol_mode) {
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318 // Use the regular identity_hash.
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319 return Hashtable<Symbol*, mtSymbol>::compute_hash(sym) ^ symbol_mode;
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320 }
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321
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322 int index_for(Symbol* name, intptr_t symbol_mode) {
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323 return hash_to_index(compute_hash(name, symbol_mode));
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324 }
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325
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326 // need not be locked; no state change
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327 SymbolPropertyEntry* find_entry(int index, unsigned int hash, Symbol* name, intptr_t name_mode);
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328
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329 // must be done under SystemDictionary_lock
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330 SymbolPropertyEntry* add_entry(int index, unsigned int hash, Symbol* name, intptr_t name_mode);
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331
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332 // GC support
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333 void oops_do(OopClosure* f);
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334
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335 void methods_do(void f(Method*));
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336
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337 // Sharing support
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338 void reorder_dictionary();
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339
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340 #ifndef PRODUCT
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341 void print();
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342 #endif
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343 void verify();
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344 };
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345 #endif // SHARE_VM_CLASSFILE_DICTIONARY_HPP