24 25 #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP 26 #define SHARE_VM_CLASSFILE_DICTIONARY_HPP 27 28 #include "classfile/systemDictionary.hpp" 29 #include "oops/instanceKlass.hpp" 30 #include "oops/oop.hpp" 31 #include "utilities/hashtable.hpp" 32 #include "utilities/ostream.hpp" 33 34 class DictionaryEntry; 35 class PSPromotionManager; 36 class ProtectionDomainCacheTable; 37 class ProtectionDomainCacheEntry; 38 class BoolObjectClosure; 39 40 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 41 // The data structure for the system dictionary (and the shared system 42 // dictionary). 43 44 class Dictionary : public TwoOopHashtable<Klass*, mtClass> { 45 friend class VMStructs; 46 private: 47 // current iteration index. 48 static int _current_class_index; 49 // pointer to the current hash table entry. 50 static DictionaryEntry* _current_class_entry; 51 52 ProtectionDomainCacheTable* _pd_cache_table; 53 54 DictionaryEntry* get_entry(int index, unsigned int hash, 55 Symbol* name, ClassLoaderData* loader_data); 56 57 protected: 58 DictionaryEntry* bucket(int i) const { 59 return (DictionaryEntry*)Hashtable<Klass*, mtClass>::bucket(i); 60 } 61 62 // The following method is not MT-safe and must be done under lock. 63 DictionaryEntry** bucket_addr(int i) { 64 return (DictionaryEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i); 65 } 66 67 void add_entry(int index, DictionaryEntry* new_entry) { 68 Hashtable<Klass*, mtClass>::add_entry(index, (HashtableEntry<Klass*, mtClass>*)new_entry); 69 } 70 71 static size_t entry_size(); 72 public: 73 Dictionary(int table_size); 74 Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries); 75 76 DictionaryEntry* new_entry(unsigned int hash, Klass* klass, ClassLoaderData* loader_data); 77 78 DictionaryEntry* new_entry(); 79 80 void free_entry(DictionaryEntry* entry); 81 82 void add_klass(Symbol* class_name, ClassLoaderData* loader_data,KlassHandle obj); 83 84 Klass* find_class(int index, unsigned int hash, 85 Symbol* name, ClassLoaderData* loader_data); 86 87 Klass* find_shared_class(int index, unsigned int hash, Symbol* name); 88 89 // Compiler support 90 Klass* try_get_next_class(); 91 92 // GC support 93 void oops_do(OopClosure* f); 94 void always_strong_oops_do(OopClosure* blk); 95 void roots_oops_do(OopClosure* strong, OopClosure* weak); 96 97 void always_strong_classes_do(KlassClosure* closure); 98 99 void classes_do(void f(Klass*)); 100 void classes_do(void f(Klass*, TRAPS), TRAPS); 101 void classes_do(void f(Klass*, ClassLoaderData*)); 102 103 void methods_do(void f(Method*)); 104 105 void unlink(BoolObjectClosure* is_alive); 106 void remove_classes_in_error_state(); 107 108 // Classes loaded by the bootstrap loader are always strongly reachable. 109 // If we're not doing class unloading, all classes are strongly reachable. 110 static bool is_strongly_reachable(ClassLoaderData* loader_data, Klass* klass) { 111 assert (klass != NULL, "should have non-null klass"); 112 return (loader_data->is_the_null_class_loader_data() || !ClassUnloading); 113 } 114 115 // Unload (that is, break root links to) all unmarked classes and loaders. 116 void do_unloading(); 117 118 // Protection domains 119 Klass* find(int index, unsigned int hash, Symbol* name, 120 ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 121 bool is_valid_protection_domain(int index, unsigned int hash, 122 Symbol* name, ClassLoaderData* loader_data, 123 Handle protection_domain); 124 void add_protection_domain(int index, unsigned int hash, 125 instanceKlassHandle klass, ClassLoaderData* loader_data, 126 Handle protection_domain, TRAPS); 127 128 // Sharing support 129 void reorder_dictionary(); 130 131 ProtectionDomainCacheEntry* cache_get(Handle protection_domain); 132 133 void print(bool details = true); 134 #ifdef ASSERT 135 void printPerformanceInfoDetails(); 136 #endif // ASSERT 137 void verify(); 138 }; 139 140 // The following classes can be in dictionary.cpp, but we need these 141 // to be in header file so that SA's vmStructs can access them. 142 class ProtectionDomainCacheEntry : public HashtableEntry<oop, mtClass> { 143 friend class VMStructs; 144 private: 145 // Flag indicating whether this protection domain entry is strongly reachable. 226 void verify(); 227 }; 228 229 230 class ProtectionDomainEntry :public CHeapObj<mtClass> { 231 friend class VMStructs; 232 public: 233 ProtectionDomainEntry* _next; 234 ProtectionDomainCacheEntry* _pd_cache; 235 236 ProtectionDomainEntry(ProtectionDomainCacheEntry* pd_cache, ProtectionDomainEntry* next) { 237 _pd_cache = pd_cache; 238 _next = next; 239 } 240 241 ProtectionDomainEntry* next() { return _next; } 242 oop protection_domain() { return _pd_cache->protection_domain(); } 243 }; 244 245 // An entry in the system dictionary, this describes a class as 246 // { Klass*, loader, protection_domain }. 247 248 class DictionaryEntry : public HashtableEntry<Klass*, mtClass> { 249 friend class VMStructs; 250 private: 251 // Contains the set of approved protection domains that can access 252 // this system dictionary entry. 253 // 254 // This protection domain set is a set of tuples: 255 // 256 // (InstanceKlass C, initiating class loader ICL, Protection Domain PD) 257 // 258 // [Note that C.protection_domain(), which is stored in the java.lang.Class 259 // mirror of C, is NOT the same as PD] 260 // 261 // If such an entry (C, ICL, PD) exists in the table, it means that 262 // it is okay for a class Foo to reference C, where 263 // 264 // Foo.protection_domain() == PD, and 265 // Foo's defining class loader == ICL 266 // 267 // The usage of the PD set can be seen in SystemDictionary::validate_protection_domain() 268 // It is essentially a cache to avoid repeated Java up-calls to 269 // ClassLoader.checkPackageAccess(). 270 // 271 ProtectionDomainEntry* _pd_set; 272 ClassLoaderData* _loader_data; 273 274 public: 275 // Tells whether a protection is in the approved set. 276 bool contains_protection_domain(oop protection_domain) const; 277 // Adds a protection domain to the approved set. 278 void add_protection_domain(Dictionary* dict, Handle protection_domain); 279 280 Klass* klass() const { return (Klass*)literal(); } 281 Klass** klass_addr() { return (Klass**)literal_addr(); } 282 283 DictionaryEntry* next() const { 284 return (DictionaryEntry*)HashtableEntry<Klass*, mtClass>::next(); 285 } 286 287 DictionaryEntry** next_addr() { 288 return (DictionaryEntry**)HashtableEntry<Klass*, mtClass>::next_addr(); 289 } 290 291 ClassLoaderData* loader_data() const { return _loader_data; } 292 void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; } 293 294 ProtectionDomainEntry* pd_set() const { return _pd_set; } 295 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; } 296 297 bool has_protection_domain() { return _pd_set != NULL; } 298 299 // Tells whether the initiating class' protection can access the this _klass 300 bool is_valid_protection_domain(Handle protection_domain) { 301 if (!ProtectionDomainVerification) return true; 302 if (!SystemDictionary::has_checkPackageAccess()) return true; 303 304 return protection_domain() == NULL 305 ? true 306 : contains_protection_domain(protection_domain()); 307 } 308 309 void set_strongly_reachable() { 310 for (ProtectionDomainEntry* current = _pd_set; 311 current != NULL; 312 current = current->_next) { 313 current->_pd_cache->set_strongly_reachable(); 314 } 315 } 316 317 void verify_protection_domain_set() { 318 for (ProtectionDomainEntry* current = _pd_set; 319 current != NULL; 320 current = current->_next) { 321 current->_pd_cache->protection_domain()->verify(); 322 } 323 } 324 325 bool equals(const Symbol* class_name, ClassLoaderData* loader_data) const { 326 Klass* klass = (Klass*)literal(); 327 return (klass->name() == class_name && _loader_data == loader_data); 328 } 329 330 void print_count(outputStream *st) { 331 int count = 0; 332 for (ProtectionDomainEntry* current = _pd_set; 333 current != NULL; 334 current = current->_next) { 335 count++; 336 } 337 st->print_cr("pd set count = #%d", count); 338 } 339 }; 340 341 // Entry in a SymbolPropertyTable, mapping a single Symbol* 342 // to a managed and an unmanaged pointer. 343 class SymbolPropertyEntry : public HashtableEntry<Symbol*, mtSymbol> { 344 friend class VMStructs; 345 private: 346 intptr_t _symbol_mode; // secondary key | 24 25 #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP 26 #define SHARE_VM_CLASSFILE_DICTIONARY_HPP 27 28 #include "classfile/systemDictionary.hpp" 29 #include "oops/instanceKlass.hpp" 30 #include "oops/oop.hpp" 31 #include "utilities/hashtable.hpp" 32 #include "utilities/ostream.hpp" 33 34 class DictionaryEntry; 35 class PSPromotionManager; 36 class ProtectionDomainCacheTable; 37 class ProtectionDomainCacheEntry; 38 class BoolObjectClosure; 39 40 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 41 // The data structure for the system dictionary (and the shared system 42 // dictionary). 43 44 class Dictionary : public TwoOopHashtable<InstanceKlass*, mtClass> { 45 friend class VMStructs; 46 private: 47 // current iteration index. 48 static int _current_class_index; 49 // pointer to the current hash table entry. 50 static DictionaryEntry* _current_class_entry; 51 52 ProtectionDomainCacheTable* _pd_cache_table; 53 54 DictionaryEntry* get_entry(int index, unsigned int hash, 55 Symbol* name, ClassLoaderData* loader_data); 56 57 protected: 58 DictionaryEntry* bucket(int i) const { 59 return (DictionaryEntry*)Hashtable<InstanceKlass*, mtClass>::bucket(i); 60 } 61 62 // The following method is not MT-safe and must be done under lock. 63 DictionaryEntry** bucket_addr(int i) { 64 return (DictionaryEntry**)Hashtable<InstanceKlass*, mtClass>::bucket_addr(i); 65 } 66 67 void add_entry(int index, DictionaryEntry* new_entry) { 68 Hashtable<InstanceKlass*, mtClass>::add_entry(index, (HashtableEntry<InstanceKlass*, mtClass>*)new_entry); 69 } 70 71 static size_t entry_size(); 72 public: 73 Dictionary(int table_size); 74 Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries); 75 76 DictionaryEntry* new_entry(unsigned int hash, InstanceKlass* klass, ClassLoaderData* loader_data); 77 78 DictionaryEntry* new_entry(); 79 80 void free_entry(DictionaryEntry* entry); 81 82 void add_klass(Symbol* class_name, ClassLoaderData* loader_data, InstanceKlass* obj); 83 84 InstanceKlass* find_class(int index, unsigned int hash, 85 Symbol* name, ClassLoaderData* loader_data); 86 87 InstanceKlass* find_shared_class(int index, unsigned int hash, Symbol* name); 88 89 // Compiler support 90 InstanceKlass* try_get_next_class(); 91 92 // GC support 93 void oops_do(OopClosure* f); 94 void always_strong_oops_do(OopClosure* blk); 95 void roots_oops_do(OopClosure* strong, OopClosure* weak); 96 97 void always_strong_classes_do(KlassClosure* closure); 98 99 void classes_do(void f(Klass*)); 100 void classes_do(void f(Klass*, TRAPS), TRAPS); 101 void classes_do(void f(Klass*, ClassLoaderData*)); 102 103 void methods_do(void f(Method*)); 104 105 void unlink(BoolObjectClosure* is_alive); 106 void remove_classes_in_error_state(); 107 108 // Classes loaded by the bootstrap loader are always strongly reachable. 109 // If we're not doing class unloading, all classes are strongly reachable. 110 static bool is_strongly_reachable(ClassLoaderData* loader_data, Klass* klass) { 111 assert (klass != NULL, "should have non-null klass"); 112 return (loader_data->is_the_null_class_loader_data() || !ClassUnloading); 113 } 114 115 // Unload (that is, break root links to) all unmarked classes and loaders. 116 void do_unloading(); 117 118 // Protection domains 119 InstanceKlass* find(int index, unsigned int hash, Symbol* name, 120 ClassLoaderData* loader_data, Handle protection_domain, TRAPS); 121 bool is_valid_protection_domain(int index, unsigned int hash, 122 Symbol* name, ClassLoaderData* loader_data, 123 Handle protection_domain); 124 void add_protection_domain(int index, unsigned int hash, 125 InstanceKlass* klass, ClassLoaderData* loader_data, 126 Handle protection_domain, TRAPS); 127 128 // Sharing support 129 void reorder_dictionary(); 130 131 ProtectionDomainCacheEntry* cache_get(Handle protection_domain); 132 133 void print(bool details = true); 134 #ifdef ASSERT 135 void printPerformanceInfoDetails(); 136 #endif // ASSERT 137 void verify(); 138 }; 139 140 // The following classes can be in dictionary.cpp, but we need these 141 // to be in header file so that SA's vmStructs can access them. 142 class ProtectionDomainCacheEntry : public HashtableEntry<oop, mtClass> { 143 friend class VMStructs; 144 private: 145 // Flag indicating whether this protection domain entry is strongly reachable. 226 void verify(); 227 }; 228 229 230 class ProtectionDomainEntry :public CHeapObj<mtClass> { 231 friend class VMStructs; 232 public: 233 ProtectionDomainEntry* _next; 234 ProtectionDomainCacheEntry* _pd_cache; 235 236 ProtectionDomainEntry(ProtectionDomainCacheEntry* pd_cache, ProtectionDomainEntry* next) { 237 _pd_cache = pd_cache; 238 _next = next; 239 } 240 241 ProtectionDomainEntry* next() { return _next; } 242 oop protection_domain() { return _pd_cache->protection_domain(); } 243 }; 244 245 // An entry in the system dictionary, this describes a class as 246 // { InstanceKlass*, loader, protection_domain }. 247 248 class DictionaryEntry : public HashtableEntry<InstanceKlass*, mtClass> { 249 friend class VMStructs; 250 private: 251 // Contains the set of approved protection domains that can access 252 // this system dictionary entry. 253 // 254 // This protection domain set is a set of tuples: 255 // 256 // (InstanceKlass C, initiating class loader ICL, Protection Domain PD) 257 // 258 // [Note that C.protection_domain(), which is stored in the java.lang.Class 259 // mirror of C, is NOT the same as PD] 260 // 261 // If such an entry (C, ICL, PD) exists in the table, it means that 262 // it is okay for a class Foo to reference C, where 263 // 264 // Foo.protection_domain() == PD, and 265 // Foo's defining class loader == ICL 266 // 267 // The usage of the PD set can be seen in SystemDictionary::validate_protection_domain() 268 // It is essentially a cache to avoid repeated Java up-calls to 269 // ClassLoader.checkPackageAccess(). 270 // 271 ProtectionDomainEntry* _pd_set; 272 ClassLoaderData* _loader_data; 273 274 public: 275 // Tells whether a protection is in the approved set. 276 bool contains_protection_domain(oop protection_domain) const; 277 // Adds a protection domain to the approved set. 278 void add_protection_domain(Dictionary* dict, Handle protection_domain); 279 280 InstanceKlass* klass() const { return (InstanceKlass*)literal(); } 281 InstanceKlass** klass_addr() { return (InstanceKlass**)literal_addr(); } 282 283 DictionaryEntry* next() const { 284 return (DictionaryEntry*)HashtableEntry<InstanceKlass*, mtClass>::next(); 285 } 286 287 DictionaryEntry** next_addr() { 288 return (DictionaryEntry**)HashtableEntry<InstanceKlass*, mtClass>::next_addr(); 289 } 290 291 ClassLoaderData* loader_data() const { return _loader_data; } 292 void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; } 293 294 ProtectionDomainEntry* pd_set() const { return _pd_set; } 295 void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; } 296 297 bool has_protection_domain() { return _pd_set != NULL; } 298 299 // Tells whether the initiating class' protection can access the this _klass 300 bool is_valid_protection_domain(Handle protection_domain) { 301 if (!ProtectionDomainVerification) return true; 302 if (!SystemDictionary::has_checkPackageAccess()) return true; 303 304 return protection_domain() == NULL 305 ? true 306 : contains_protection_domain(protection_domain()); 307 } 308 309 void set_strongly_reachable() { 310 for (ProtectionDomainEntry* current = _pd_set; 311 current != NULL; 312 current = current->_next) { 313 current->_pd_cache->set_strongly_reachable(); 314 } 315 } 316 317 void verify_protection_domain_set() { 318 for (ProtectionDomainEntry* current = _pd_set; 319 current != NULL; 320 current = current->_next) { 321 current->_pd_cache->protection_domain()->verify(); 322 } 323 } 324 325 bool equals(const Symbol* class_name, ClassLoaderData* loader_data) const { 326 InstanceKlass* klass = (InstanceKlass*)literal(); 327 return (klass->name() == class_name && _loader_data == loader_data); 328 } 329 330 void print_count(outputStream *st) { 331 int count = 0; 332 for (ProtectionDomainEntry* current = _pd_set; 333 current != NULL; 334 current = current->_next) { 335 count++; 336 } 337 st->print_cr("pd set count = #%d", count); 338 } 339 }; 340 341 // Entry in a SymbolPropertyTable, mapping a single Symbol* 342 // to a managed and an unmanaged pointer. 343 class SymbolPropertyEntry : public HashtableEntry<Symbol*, mtSymbol> { 344 friend class VMStructs; 345 private: 346 intptr_t _symbol_mode; // secondary key |