1 /*

     2  * Copyright 2005 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 ResolutionErrorEntry;

    26 

    27 // ResolutionError objects are used to record errors encountered during

    28 // constant pool resolution (JVMS 5.4.3).

    29 

    30 class ResolutionErrorTable : public Hashtable {

    31 

    32 public:

    33   ResolutionErrorTable(int table_size);

    34 

    35   ResolutionErrorEntry* new_entry(int hash, constantPoolOop pool, int cp_index, symbolOop error);

    36 

    37   ResolutionErrorEntry* bucket(int i) {

    38     return (ResolutionErrorEntry*)Hashtable::bucket(i);

    39   }

    40 

    41   ResolutionErrorEntry** bucket_addr(int i) {

    42     return (ResolutionErrorEntry**)Hashtable::bucket_addr(i);

    43   }

    44 

    45   void add_entry(int index, ResolutionErrorEntry* new_entry) {

    46     Hashtable::add_entry(index, (HashtableEntry*)new_entry);

    47   }

    48 

    49   void add_entry(int index, unsigned int hash,

    50                  constantPoolHandle pool, int which, symbolHandle error);

    51 

    52 

    53   // find error given the constant pool and constant pool index

    54   ResolutionErrorEntry* find_entry(int index, unsigned int hash,

    55                                    constantPoolHandle pool, int cp_index);

    56 

    57 

    58   unsigned int compute_hash(constantPoolHandle pool, int cp_index) {

    59     return (unsigned int) pool->identity_hash() + cp_index;

    60   }

    61 

    62   // purges unloaded entries from the table

    63   void purge_resolution_errors(BoolObjectClosure* is_alive);

    64 

    65   // this table keeps symbolOops alive

    66   void always_strong_classes_do(OopClosure* blk);

    67 

    68   // GC support.

    69   void oops_do(OopClosure* f);

    70 };

    71 

    72 

    73 class ResolutionErrorEntry : public HashtableEntry {

    74  private:

    75   int               _cp_index;

    76   symbolOop         _error;

    77 

    78  public:

    79   constantPoolOop    pool() const               { return (constantPoolOop)literal(); }

    80   constantPoolOop*   pool_addr()                { return (constantPoolOop*)literal_addr(); }

    81 

    82   int                cp_index() const           { return _cp_index; }

    83   void               set_cp_index(int cp_index) { _cp_index = cp_index; }

    84 

    85   symbolOop          error() const              { return _error; }

    86   void               set_error(symbolOop e)     { _error = e; }

    87   symbolOop*         error_addr()               { return &_error; }

    88 

    89   ResolutionErrorEntry* next() const {

    90     return (ResolutionErrorEntry*)HashtableEntry::next();

    91   }

    92 

    93   ResolutionErrorEntry** next_addr() {

    94     return (ResolutionErrorEntry**)HashtableEntry::next_addr();

    95   }

    96 

    97   // GC support

    98   void oops_do(OopClosure* blk);

    99 };