duke@435: /*
jrose@1100:  * Copyright 2003-2009 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: class LoaderConstraintEntry;
duke@435: 
duke@435: class LoaderConstraintTable : public Hashtable {
duke@435:   friend class VMStructs;
duke@435: private:
duke@435: 
duke@435:   enum Constants {
duke@435:     _loader_constraint_size = 107,                     // number of entries in constraint table
duke@435:     _nof_buckets            = 1009                     // number of buckets in hash table
duke@435:   };
duke@435: 
duke@435:   LoaderConstraintEntry** find_loader_constraint(symbolHandle name,
duke@435:                                                  Handle loader);
duke@435: 
duke@435: public:
duke@435: 
duke@435:   LoaderConstraintTable(int nof_buckets);
duke@435: 
duke@435:   LoaderConstraintEntry* new_entry(unsigned int hash, symbolOop name,
duke@435:                                    klassOop klass, int num_loaders,
duke@435:                                    int max_loaders);
duke@435: 
duke@435:   LoaderConstraintEntry* bucket(int i) {
duke@435:     return (LoaderConstraintEntry*)Hashtable::bucket(i);
duke@435:   }
duke@435: 
duke@435:   LoaderConstraintEntry** bucket_addr(int i) {
duke@435:     return (LoaderConstraintEntry**)Hashtable::bucket_addr(i);
duke@435:   }
duke@435: 
duke@435:   // GC support
duke@435:   void oops_do(OopClosure* f);
duke@435:   void always_strong_classes_do(OopClosure* blk);
duke@435: 
duke@435:   // Check class loader constraints
duke@435:   bool add_entry(symbolHandle name, klassOop klass1, Handle loader1,
duke@435:                                     klassOop klass2, Handle loader2);
duke@435: 
jrose@1100:   // Note:  The main entry point for this module is via SystemDictionary.
jrose@1100:   // SystemDictionary::check_signature_loaders(symbolHandle signature,
jrose@1100:   //                                           Handle loader1, Handle loader2,
jrose@1100:   //                                           bool is_method, TRAPS)
duke@435: 
duke@435:   klassOop find_constrained_klass(symbolHandle name, Handle loader);
duke@435:   klassOop find_constrained_elem_klass(symbolHandle name, symbolHandle elem_name,
duke@435:                                        Handle loader, TRAPS);
duke@435: 
duke@435: 
duke@435:   // Class loader constraints
duke@435: 
duke@435:   void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);
duke@435:   void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,
duke@435:                                 klassOop klass);
duke@435:   void merge_loader_constraints(LoaderConstraintEntry** pp1,
duke@435:                                 LoaderConstraintEntry** pp2, klassOop klass);
duke@435: 
duke@435:   bool check_or_update(instanceKlassHandle k, Handle loader,
duke@435:                               symbolHandle name);
duke@435: 
duke@435: 
duke@435:   void purge_loader_constraints(BoolObjectClosure* is_alive);
duke@435: 
duke@435:   void verify(Dictionary* dictionary);
duke@435: #ifndef PRODUCT
duke@435:   void print();
duke@435: #endif
duke@435: };
duke@435: 
duke@435: class LoaderConstraintEntry : public HashtableEntry {
duke@435:   friend class VMStructs;
duke@435: private:
duke@435:   symbolOop              _name;                   // class name
duke@435:   int                    _num_loaders;
duke@435:   int                    _max_loaders;
duke@435:   oop*                   _loaders;                // initiating loaders
duke@435: 
duke@435: public:
duke@435: 
duke@435:   klassOop klass() { return (klassOop)literal(); }
duke@435:   klassOop* klass_addr() { return (klassOop*)literal_addr(); }
duke@435:   void set_klass(klassOop k) { set_literal(k); }
duke@435: 
duke@435:   LoaderConstraintEntry* next() {
duke@435:     return (LoaderConstraintEntry*)HashtableEntry::next();
duke@435:   }
duke@435: 
duke@435:   LoaderConstraintEntry** next_addr() {
duke@435:     return (LoaderConstraintEntry**)HashtableEntry::next_addr();
duke@435:   }
duke@435:   void set_next(LoaderConstraintEntry* next) {
duke@435:     HashtableEntry::set_next(next);
duke@435:   }
duke@435: 
duke@435:   symbolOop name() { return _name; }
duke@435:   symbolOop* name_addr() { return &_name; }
duke@435:   void set_name(symbolOop name) { _name = name; }
duke@435: 
duke@435:   int num_loaders() { return _num_loaders; }
duke@435:   void set_num_loaders(int i) { _num_loaders = i; }
duke@435: 
duke@435:   int max_loaders() { return _max_loaders; }
duke@435:   void set_max_loaders(int i) { _max_loaders = i; }
duke@435: 
duke@435:   oop* loaders() { return _loaders; }
duke@435:   void set_loaders(oop* loaders) { _loaders = loaders; }
duke@435: 
duke@435:   oop loader(int i) { return _loaders[i]; }
duke@435:   oop* loader_addr(int i) { return &_loaders[i]; }
duke@435:   void set_loader(int i, oop p) { _loaders[i] = p; }
duke@435: 
duke@435: };