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1 /*
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2 * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class DictionaryEntry;
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26
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27 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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28 // The data structure for the system dictionary (and the shared system
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29 // dictionary).
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30
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31 class Dictionary : public TwoOopHashtable {
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32 friend class VMStructs;
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33 private:
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34 // current iteration index.
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35 static int _current_class_index;
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36 // pointer to the current hash table entry.
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37 static DictionaryEntry* _current_class_entry;
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38
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39 DictionaryEntry* get_entry(int index, unsigned int hash,
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40 symbolHandle name, Handle loader);
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41
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42 DictionaryEntry* bucket(int i) {
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43 return (DictionaryEntry*)Hashtable::bucket(i);
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44 }
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45
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46 // The following method is not MT-safe and must be done under lock.
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47 DictionaryEntry** bucket_addr(int i) {
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48 return (DictionaryEntry**)Hashtable::bucket_addr(i);
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49 }
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50
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51 void add_entry(int index, DictionaryEntry* new_entry) {
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52 Hashtable::add_entry(index, (HashtableEntry*)new_entry);
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53 }
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54
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55
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56 public:
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57 Dictionary(int table_size);
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58 Dictionary(int table_size, HashtableBucket* t, int number_of_entries);
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59
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60 DictionaryEntry* new_entry(unsigned int hash, klassOop klass, oop loader);
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61
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62 DictionaryEntry* new_entry();
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63
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64 void free_entry(DictionaryEntry* entry);
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65
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66 void add_klass(symbolHandle class_name, Handle class_loader,KlassHandle obj);
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67
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68 klassOop find_class(int index, unsigned int hash,
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69 symbolHandle name, Handle loader);
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70
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71 klassOop find_shared_class(int index, unsigned int hash, symbolHandle name);
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72
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73 // Compiler support
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74 klassOop try_get_next_class();
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75
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76 // GC support
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77
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78 void oops_do(OopClosure* f);
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79 void always_strong_classes_do(OopClosure* blk);
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80 void classes_do(void f(klassOop));
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81 void classes_do(void f(klassOop, TRAPS), TRAPS);
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82 void classes_do(void f(klassOop, oop));
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83 void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
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84
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85 void methods_do(void f(methodOop));
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86
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87
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88 // Classes loaded by the bootstrap loader are always strongly reachable.
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89 // If we're not doing class unloading, all classes are strongly reachable.
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90 static bool is_strongly_reachable(oop class_loader, oop klass) {
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91 assert (klass != NULL, "should have non-null klass");
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92 return (class_loader == NULL || !ClassUnloading);
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93 }
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94
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95 // Unload (that is, break root links to) all unmarked classes and
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96 // loaders. Returns "true" iff something was unloaded.
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97 bool do_unloading(BoolObjectClosure* is_alive);
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98
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99 // Protection domains
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100 klassOop find(int index, unsigned int hash, symbolHandle name,
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101 Handle loader, Handle protection_domain, TRAPS);
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102 bool is_valid_protection_domain(int index, unsigned int hash,
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103 symbolHandle name, Handle class_loader,
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104 Handle protection_domain);
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105 void add_protection_domain(int index, unsigned int hash,
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106 instanceKlassHandle klass, Handle loader,
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107 Handle protection_domain, TRAPS);
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108
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109 // Sharing support
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110 void dump(SerializeOopClosure* soc);
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111 void restore(SerializeOopClosure* soc);
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112 void reorder_dictionary();
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113
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114
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115 #ifndef PRODUCT
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116 void print();
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117 #endif
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118 void verify();
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119 };
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120
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121 // The following classes can be in dictionary.cpp, but we need these
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122 // to be in header file so that SA's vmStructs can access.
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123
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124 class ProtectionDomainEntry :public CHeapObj {
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125 friend class VMStructs;
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126 public:
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127 ProtectionDomainEntry* _next;
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128 oop _protection_domain;
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129
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130 ProtectionDomainEntry(oop protection_domain, ProtectionDomainEntry* next) {
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131 _protection_domain = protection_domain;
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132 _next = next;
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133 }
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134
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135 ProtectionDomainEntry* next() { return _next; }
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136 oop protection_domain() { return _protection_domain; }
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137 };
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138
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139 // An entry in the system dictionary, this describes a class as
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140 // { klassOop, loader, protection_domain }.
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141
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142 class DictionaryEntry : public HashtableEntry {
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143 friend class VMStructs;
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144 private:
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145 // Contains the set of approved protection domains that can access
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146 // this system dictionary entry.
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147 ProtectionDomainEntry* _pd_set;
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148 oop _loader;
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149
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150
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151 public:
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152 // Tells whether a protection is in the approved set.
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153 bool contains_protection_domain(oop protection_domain) const;
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154 // Adds a protection domain to the approved set.
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155 void add_protection_domain(oop protection_domain);
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156
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157 klassOop klass() const { return (klassOop)literal(); }
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158 klassOop* klass_addr() { return (klassOop*)literal_addr(); }
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159
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160 DictionaryEntry* next() const {
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161 return (DictionaryEntry*)HashtableEntry::next();
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162 }
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163
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164 DictionaryEntry** next_addr() {
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165 return (DictionaryEntry**)HashtableEntry::next_addr();
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166 }
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167
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168 oop loader() const { return _loader; }
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169 void set_loader(oop loader) { _loader = loader; }
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170 oop* loader_addr() { return &_loader; }
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171
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172 ProtectionDomainEntry* pd_set() const { return _pd_set; }
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173 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; }
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174
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175 bool has_protection_domain() { return _pd_set != NULL; }
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176
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177 // Tells whether the initiating class' protection can access the this _klass
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178 bool is_valid_protection_domain(Handle protection_domain) {
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179 if (!ProtectionDomainVerification) return true;
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180 if (!SystemDictionary::has_checkPackageAccess()) return true;
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181
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182 return protection_domain() == NULL
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183 ? true
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184 : contains_protection_domain(protection_domain());
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185 }
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186
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187
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188 void protection_domain_set_oops_do(OopClosure* f) {
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189 for (ProtectionDomainEntry* current = _pd_set;
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190 current != NULL;
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191 current = current->_next) {
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192 f->do_oop(&(current->_protection_domain));
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193 }
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194 }
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195
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196 void verify_protection_domain_set() {
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197 for (ProtectionDomainEntry* current = _pd_set;
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198 current != NULL;
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199 current = current->_next) {
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200 current->_protection_domain->verify();
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201 }
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202 }
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203
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204 bool equals(symbolOop class_name, oop class_loader) const {
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205 klassOop klass = (klassOop)literal();
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206 return (instanceKlass::cast(klass)->name() == class_name &&
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207 _loader == class_loader);
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208 }
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209
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210 void print() {
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211 int count = 0;
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212 for (ProtectionDomainEntry* current = _pd_set;
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213 current != NULL;
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214 current = current->_next) {
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215 count++;
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216 }
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217 tty->print_cr("pd set = #%d", count);
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218 }
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219 };
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