19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP 26 #define SHARE_VM_CLASSFILE_DICTIONARY_HPP 27 28 #include "classfile/protectionDomainCache.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "oops/instanceKlass.hpp" 31 #include "oops/oop.hpp" 32 #include "utilities/hashtable.hpp" 33 #include "utilities/ostream.hpp" 34 35 class DictionaryEntry; 36 class BoolObjectClosure; 37 38 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 39 // The data structure for the system dictionary (and the shared system 40 // dictionary). 41 42 class Dictionary : public TwoOopHashtable<InstanceKlass*, mtClass> { 43 friend class VMStructs; 44 private: 45 // current iteration index. 46 static int _current_class_index; 47 // pointer to the current hash table entry. 48 static DictionaryEntry* _current_class_entry; 49 50 ProtectionDomainCacheTable* _pd_cache_table; 51 52 DictionaryEntry* get_entry(int index, unsigned int hash, 53 Symbol* name, ClassLoaderData* loader_data); 54 55 protected: 56 DictionaryEntry* bucket(int i) const { 57 return (DictionaryEntry*)Hashtable<InstanceKlass*, mtClass>::bucket(i); 58 } 59 60 // The following method is not MT-safe and must be done under lock. 61 DictionaryEntry** bucket_addr(int i) { 62 return (DictionaryEntry**)Hashtable<InstanceKlass*, mtClass>::bucket_addr(i); 63 } 64 65 void add_entry(int index, DictionaryEntry* new_entry) { 66 Hashtable<InstanceKlass*, mtClass>::add_entry(index, (HashtableEntry<InstanceKlass*, mtClass>*)new_entry); 67 } 68 69 static size_t entry_size(); 70 public: 71 Dictionary(int table_size); 72 Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries); 73 74 DictionaryEntry* new_entry(unsigned int hash, InstanceKlass* klass, ClassLoaderData* loader_data); 75 76 void free_entry(DictionaryEntry* entry); 77 78 void add_klass(Symbol* class_name, ClassLoaderData* loader_data, InstanceKlass* obj); 79 80 InstanceKlass* find_class(int index, unsigned int hash, 81 Symbol* name, ClassLoaderData* loader_data); 82 83 InstanceKlass* find_shared_class(int index, unsigned int hash, Symbol* name); 84 85 // Compiler support 86 InstanceKlass* try_get_next_class(); 87 88 // GC support 89 void oops_do(OopClosure* f); 90 void roots_oops_do(OopClosure* strong, OopClosure* weak); 91 92 void classes_do(void f(Klass*)); 93 void classes_do(void f(Klass*, TRAPS), TRAPS); 94 void classes_do(void f(Klass*, ClassLoaderData*)); 95 96 void unlink(BoolObjectClosure* is_alive); 97 void remove_classes_in_error_state(); 98 99 // Classes loaded by the bootstrap loader are always strongly reachable. 100 // If we're not doing class unloading, all classes are strongly reachable. 101 static bool is_strongly_reachable(ClassLoaderData* loader_data, Klass* klass) { 102 assert (klass != NULL, "should have non-null klass"); 103 return (loader_data->is_the_null_class_loader_data() || !ClassUnloading); 104 } 105 106 // Unload (that is, break root links to) all unmarked classes and loaders. 107 void do_unloading(); 108 109 // Protection domains 110 InstanceKlass* find(int index, unsigned int hash, Symbol* name, 111 ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 112 bool is_valid_protection_domain(int index, unsigned int hash, 113 Symbol* name, ClassLoaderData* loader_data, 114 Handle protection_domain); 115 void add_protection_domain(int index, unsigned int hash, 116 InstanceKlass* klass, ClassLoaderData* loader_data, 117 Handle protection_domain, TRAPS); 118 119 // Sharing support 120 void reorder_dictionary(); 121 122 ProtectionDomainCacheEntry* cache_get(Handle protection_domain); 123 124 void print(bool details = true); 125 #ifdef ASSERT 126 void printPerformanceInfoDetails(); 127 #endif // ASSERT 128 void verify(); 129 }; 130 131 // An entry in the system dictionary, this describes a class as 132 // { InstanceKlass*, loader, protection_domain }. 133 134 class DictionaryEntry : public HashtableEntry<InstanceKlass*, mtClass> { 135 friend class VMStructs; 136 private: 137 // Contains the set of approved protection domains that can access 138 // this system dictionary entry. 139 // 140 // This protection domain set is a set of tuples: 141 // 142 // (InstanceKlass C, initiating class loader ICL, Protection Domain PD) 143 // 144 // [Note that C.protection_domain(), which is stored in the java.lang.Class 145 // mirror of C, is NOT the same as PD] 146 // 147 // If such an entry (C, ICL, PD) exists in the table, it means that 148 // it is okay for a class Foo to reference C, where 149 // 150 // Foo.protection_domain() == PD, and 151 // Foo's defining class loader == ICL 152 // 153 // The usage of the PD set can be seen in SystemDictionary::validate_protection_domain() 154 // It is essentially a cache to avoid repeated Java up-calls to 155 // ClassLoader.checkPackageAccess(). 156 // 157 ProtectionDomainEntry* _pd_set; 158 ClassLoaderData* _loader_data; 159 160 public: 161 // Tells whether a protection is in the approved set. 162 bool contains_protection_domain(oop protection_domain) const; 163 // Adds a protection domain to the approved set. 164 void add_protection_domain(Dictionary* dict, Handle protection_domain); 165 166 InstanceKlass* klass() const { return (InstanceKlass*)literal(); } 167 168 DictionaryEntry* next() const { 169 return (DictionaryEntry*)HashtableEntry<InstanceKlass*, mtClass>::next(); 170 } 171 172 DictionaryEntry** next_addr() { 173 return (DictionaryEntry**)HashtableEntry<InstanceKlass*, mtClass>::next_addr(); 174 } 175 176 ClassLoaderData* loader_data() const { return _loader_data; } 177 void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; } 178 179 ProtectionDomainEntry* pd_set() const { return _pd_set; } 180 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; } 181 182 // Tells whether the initiating class' protection can access the this _klass 183 bool is_valid_protection_domain(Handle protection_domain) { 184 if (!ProtectionDomainVerification) return true; 185 if (!SystemDictionary::has_checkPackageAccess()) return true; 186 187 return protection_domain() == NULL 188 ? true 189 : contains_protection_domain(protection_domain()); 190 } 191 192 void verify_protection_domain_set() { 193 for (ProtectionDomainEntry* current = _pd_set; 194 current != NULL; 195 current = current->_next) { 196 current->_pd_cache->protection_domain()->verify(); 197 } 198 } 199 200 bool equals(const Symbol* class_name, ClassLoaderData* loader_data) const { 201 InstanceKlass* klass = (InstanceKlass*)literal(); 202 return (klass->name() == class_name && _loader_data == loader_data); 203 } 204 205 void print_count(outputStream *st) { 206 int count = 0; 207 for (ProtectionDomainEntry* current = _pd_set; 208 current != NULL; 209 current = current->_next) { 210 count++; 211 } 212 st->print_cr("pd set count = #%d", count); 213 } 214 215 void verify(); 216 }; 217 218 // Entry in a SymbolPropertyTable, mapping a single Symbol* 219 // to a managed and an unmanaged pointer. 220 class SymbolPropertyEntry : public HashtableEntry<Symbol*, mtSymbol> { 221 friend class VMStructs; 222 private: | 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP 26 #define SHARE_VM_CLASSFILE_DICTIONARY_HPP 27 28 #include "classfile/protectionDomainCache.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "oops/instanceKlass.hpp" 31 #include "oops/oop.hpp" 32 #include "utilities/hashtable.hpp" 33 #include "utilities/ostream.hpp" 34 35 class DictionaryEntry; 36 class BoolObjectClosure; 37 38 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 39 // The data structure for the class loader data dictionaries (and the shared system 40 // dictionary). 41 42 class Dictionary : public Hashtable<InstanceKlass*, mtClass> { 43 friend class VMStructs; 44 45 ClassLoaderData* _loader_data; // backpointer to owning loader 46 ClassLoaderData* loader_data() const { return _loader_data; } 47 48 DictionaryEntry* get_entry(int index, unsigned int hash, Symbol* name); 49 50 protected: 51 DictionaryEntry* bucket(int i) const { 52 return (DictionaryEntry*)Hashtable<InstanceKlass*, mtClass>::bucket(i); 53 } 54 55 // The following method is not MT-safe and must be done under lock. 56 DictionaryEntry** bucket_addr(int i) { 57 return (DictionaryEntry**)Hashtable<InstanceKlass*, mtClass>::bucket_addr(i); 58 } 59 60 void add_entry(int index, DictionaryEntry* new_entry) { 61 Hashtable<InstanceKlass*, mtClass>::add_entry(index, (HashtableEntry<InstanceKlass*, mtClass>*)new_entry); 62 } 63 64 void free_entry(DictionaryEntry* entry); 65 66 static size_t entry_size(); 67 public: 68 Dictionary(ClassLoaderData* loader_data, int table_size); 69 Dictionary(ClassLoaderData* loader_data, int table_size, HashtableBucket<mtClass>* t, int number_of_entries); 70 ~Dictionary(); 71 72 DictionaryEntry* new_entry(unsigned int hash, InstanceKlass* klass); 73 74 void add_klass(int index, unsigned int hash, Symbol* class_name, InstanceKlass* obj); 75 76 InstanceKlass* find_class(int index, unsigned int hash, Symbol* name); 77 78 InstanceKlass* find_shared_class(int index, unsigned int hash, Symbol* name); 79 80 // GC support 81 void oops_do(OopClosure* f); 82 void roots_oops_do(OopClosure* strong, OopClosure* weak); 83 84 void classes_do(void f(InstanceKlass*)); 85 void classes_do(void f(InstanceKlass*, TRAPS), TRAPS); 86 void all_entries_do(void f(InstanceKlass*, ClassLoaderData*)); 87 88 void unlink(BoolObjectClosure* is_alive); 89 void remove_classes_in_error_state(); 90 91 // Unload classes whose defining loaders are unloaded 92 void do_unloading(); 93 94 // Protection domains 95 InstanceKlass* find(int index, unsigned int hash, Symbol* name, Handle protection_domain); 96 bool is_valid_protection_domain(int index, unsigned int hash, 97 Symbol* name, 98 Handle protection_domain); 99 void add_protection_domain(int index, unsigned int hash, 100 InstanceKlass* klass, 101 Handle protection_domain, TRAPS); 102 103 // Sharing support 104 void reorder_dictionary(); 105 106 void print(bool details = true); 107 #ifdef ASSERT 108 void printPerformanceInfoDetails(); 109 #endif // ASSERT 110 void verify(); 111 }; 112 113 // An entry in the class loader data dictionaries, this describes a class as 114 // { InstanceKlass*, protection_domain }. 115 116 class DictionaryEntry : public HashtableEntry<InstanceKlass*, mtClass> { 117 friend class VMStructs; 118 private: 119 // Contains the set of approved protection domains that can access 120 // this dictionary entry. 121 // 122 // This protection domain set is a set of tuples: 123 // 124 // (InstanceKlass C, initiating class loader ICL, Protection Domain PD) 125 // 126 // [Note that C.protection_domain(), which is stored in the java.lang.Class 127 // mirror of C, is NOT the same as PD] 128 // 129 // If such an entry (C, ICL, PD) exists in the table, it means that 130 // it is okay for a class Foo to reference C, where 131 // 132 // Foo.protection_domain() == PD, and 133 // Foo's defining class loader == ICL 134 // 135 // The usage of the PD set can be seen in SystemDictionary::validate_protection_domain() 136 // It is essentially a cache to avoid repeated Java up-calls to 137 // ClassLoader.checkPackageAccess(). 138 // 139 ProtectionDomainEntry* _pd_set; 140 141 public: 142 // Tells whether a protection is in the approved set. 143 bool contains_protection_domain(oop protection_domain) const; 144 // Adds a protection domain to the approved set. 145 void add_protection_domain(Dictionary* dict, Handle protection_domain); 146 147 InstanceKlass* instance_klass() const { return (InstanceKlass*)literal(); } 148 149 DictionaryEntry* next() const { 150 return (DictionaryEntry*)HashtableEntry<InstanceKlass*, mtClass>::next(); 151 } 152 153 DictionaryEntry** next_addr() { 154 return (DictionaryEntry**)HashtableEntry<InstanceKlass*, mtClass>::next_addr(); 155 } 156 157 ProtectionDomainEntry* pd_set() const { return _pd_set; } 158 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; } 159 160 // Tells whether the initiating class' protection domain can access the klass in this entry 161 bool is_valid_protection_domain(Handle protection_domain) { 162 if (!ProtectionDomainVerification) return true; 163 if (!SystemDictionary::has_checkPackageAccess()) return true; 164 165 return protection_domain() == NULL 166 ? true 167 : contains_protection_domain(protection_domain()); 168 } 169 170 void verify_protection_domain_set() { 171 for (ProtectionDomainEntry* current = _pd_set; 172 current != NULL; 173 current = current->_next) { 174 current->_pd_cache->protection_domain()->verify(); 175 } 176 } 177 178 bool equals(const Symbol* class_name) const { 179 InstanceKlass* klass = (InstanceKlass*)literal(); 180 return (klass->name() == class_name); 181 } 182 183 void print_count(outputStream *st) { 184 int count = 0; 185 for (ProtectionDomainEntry* current = _pd_set; 186 current != NULL; 187 current = current->_next) { 188 count++; 189 } 190 st->print_cr("pd set count = #%d", count); 191 } 192 193 void verify(); 194 }; 195 196 // Entry in a SymbolPropertyTable, mapping a single Symbol* 197 // to a managed and an unmanaged pointer. 198 class SymbolPropertyEntry : public HashtableEntry<Symbol*, mtSymbol> { 199 friend class VMStructs; 200 private: |