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 /*

  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #ifndef SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP

 #define SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP

 #include "classfile/dictionary.hpp"

 #include "classfile/placeholders.hpp"

 #include "utilities/hashtable.hpp"

 class LoaderConstraintEntry;

 class LoaderConstraintTable : public Hashtable<klassOop> {

   friend class VMStructs;

 private:

   enum Constants {

     _loader_constraint_size = 107,                     // number of entries in constraint table

     _nof_buckets            = 1009                     // number of buckets in hash table

   };

   LoaderConstraintEntry** find_loader_constraint(Symbol* name,

                                                  Handle loader);

 public:

   LoaderConstraintTable(int nof_buckets);

   LoaderConstraintEntry* new_entry(unsigned int hash, Symbol* name,

                                    klassOop klass, int num_loaders,

                                    int max_loaders);

   void free_entry(LoaderConstraintEntry *entry);

   LoaderConstraintEntry* bucket(int i) {

     return (LoaderConstraintEntry*)Hashtable<klassOop>::bucket(i);

   }

   LoaderConstraintEntry** bucket_addr(int i) {

     return (LoaderConstraintEntry**)Hashtable<klassOop>::bucket_addr(i);

   }

   // GC support

   void oops_do(OopClosure* f);

   // Check class loader constraints

   bool add_entry(Symbol* name, klassOop klass1, Handle loader1,

                                     klassOop klass2, Handle loader2);

   // Note:  The main entry point for this module is via SystemDictionary.

   // SystemDictionary::check_signature_loaders(Symbol* signature,

   //                                           Handle loader1, Handle loader2,

   //                                           bool is_method, TRAPS)

   klassOop find_constrained_klass(Symbol* name, Handle loader);

   // Class loader constraints

   void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);

   void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,

                                 klassOop klass);

   void merge_loader_constraints(LoaderConstraintEntry** pp1,

                                 LoaderConstraintEntry** pp2, klassOop klass);

   bool check_or_update(instanceKlassHandle k, Handle loader,

                               Symbol* name);

   void purge_loader_constraints(BoolObjectClosure* is_alive);

   void verify(Dictionary* dictionary, PlaceholderTable* placeholders);

 #ifndef PRODUCT

   void print();

 #endif

 };

 class LoaderConstraintEntry : public HashtableEntry<klassOop> {

   friend class VMStructs;

 private:

   Symbol*                _name;                   // class name

   int                    _num_loaders;

   int                    _max_loaders;

   oop*                   _loaders;                // initiating loaders

 public:

   klassOop klass() { return literal(); }

   klassOop* klass_addr() { return literal_addr(); }

   void set_klass(klassOop k) { set_literal(k); }

   LoaderConstraintEntry* next() {

     return (LoaderConstraintEntry*)HashtableEntry<klassOop>::next();

   }

   LoaderConstraintEntry** next_addr() {

     return (LoaderConstraintEntry**)HashtableEntry<klassOop>::next_addr();

   }

   void set_next(LoaderConstraintEntry* next) {

     HashtableEntry<klassOop>::set_next(next);

   }

   Symbol* name() { return _name; }

   void set_name(Symbol* name) {

     _name = name;

     if (name != NULL) name->increment_refcount();

   }

   int num_loaders() { return _num_loaders; }

   void set_num_loaders(int i) { _num_loaders = i; }

   int max_loaders() { return _max_loaders; }

   void set_max_loaders(int i) { _max_loaders = i; }

   oop* loaders() { return _loaders; }

   void set_loaders(oop* loaders) { _loaders = loaders; }

   oop loader(int i) { return _loaders[i]; }

   oop* loader_addr(int i) { return &_loaders[i]; }

   void set_loader(int i, oop p) { _loaders[i] = p; }

 };

 #endif // SHARE_VM_CLASSFILE_LOADERCONSTRAINTS_HPP