1 /*

     2  * Copyright 2003-2006 Sun Microsystems, Inc.  All Rights Reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 class LoaderConstraintEntry;

    26 

    27 class LoaderConstraintTable : public Hashtable {

    28   friend class VMStructs;

    29 private:

    30 

    31   enum Constants {

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

    33     _nof_buckets            = 1009                     // number of buckets in hash table

    34   };

    35 

    36   LoaderConstraintEntry** find_loader_constraint(symbolHandle name,

    37                                                  Handle loader);

    38 

    39 public:

    40 

    41   LoaderConstraintTable(int nof_buckets);

    42 

    43   LoaderConstraintEntry* new_entry(unsigned int hash, symbolOop name,

    44                                    klassOop klass, int num_loaders,

    45                                    int max_loaders);

    46 

    47   LoaderConstraintEntry* bucket(int i) {

    48     return (LoaderConstraintEntry*)Hashtable::bucket(i);

    49   }

    50 

    51   LoaderConstraintEntry** bucket_addr(int i) {

    52     return (LoaderConstraintEntry**)Hashtable::bucket_addr(i);

    53   }

    54 

    55   // GC support

    56   void oops_do(OopClosure* f);

    57   void always_strong_classes_do(OopClosure* blk);

    58 

    59   // Check class loader constraints

    60   bool add_entry(symbolHandle name, klassOop klass1, Handle loader1,

    61                                     klassOop klass2, Handle loader2);

    62 

    63   void check_signature_loaders(symbolHandle signature, Handle loader1,

    64                                Handle loader2, bool is_method, TRAPS);

    65 

    66   klassOop find_constrained_klass(symbolHandle name, Handle loader);

    67   klassOop find_constrained_elem_klass(symbolHandle name, symbolHandle elem_name,

    68                                        Handle loader, TRAPS);

    69 

    70 

    71   // Class loader constraints

    72 

    73   void ensure_loader_constraint_capacity(LoaderConstraintEntry *p, int nfree);

    74   void extend_loader_constraint(LoaderConstraintEntry* p, Handle loader,

    75                                 klassOop klass);

    76   void merge_loader_constraints(LoaderConstraintEntry** pp1,

    77                                 LoaderConstraintEntry** pp2, klassOop klass);

    78 

    79   bool check_or_update(instanceKlassHandle k, Handle loader,

    80                               symbolHandle name);

    81 

    82 

    83   void purge_loader_constraints(BoolObjectClosure* is_alive);

    84 

    85   void verify(Dictionary* dictionary);

    86 #ifndef PRODUCT

    87   void print();

    88 #endif

    89 };

    90 

    91 class LoaderConstraintEntry : public HashtableEntry {

    92   friend class VMStructs;

    93 private:

    94   symbolOop              _name;                   // class name

    95   int                    _num_loaders;

    96   int                    _max_loaders;

    97   oop*                   _loaders;                // initiating loaders

    98 

    99 public:

   100 

   101   klassOop klass() { return (klassOop)literal(); }

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

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

   104 

   105   LoaderConstraintEntry* next() {

   106     return (LoaderConstraintEntry*)HashtableEntry::next();

   107   }

   108 

   109   LoaderConstraintEntry** next_addr() {

   110     return (LoaderConstraintEntry**)HashtableEntry::next_addr();

   111   }

   112   void set_next(LoaderConstraintEntry* next) {

   113     HashtableEntry::set_next(next);

   114   }

   115 

   116   symbolOop name() { return _name; }

   117   symbolOop* name_addr() { return &_name; }

   118   void set_name(symbolOop name) { _name = name; }

   119 

   120   int num_loaders() { return _num_loaders; }

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

   122 

   123   int max_loaders() { return _max_loaders; }

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

   125 

   126   oop* loaders() { return _loaders; }

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

   128 

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

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

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

   132 

   133 };