1 /*
   2  * Copyright (c) 2005, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_CLASSFILE_RESOLUTIONERRORS_HPP
  26 #define SHARE_VM_CLASSFILE_RESOLUTIONERRORS_HPP
  27 
  28 #include "oops/constantPool.hpp"
  29 #include "utilities/hashtable.hpp"
  30 
  31 class ResolutionErrorEntry;
  32 
  33 // ResolutionError objects are used to record errors encountered during
  34 // constant pool resolution (JVMS 5.4.3).
  35 
  36 class ResolutionErrorTable : public Hashtable<ConstantPool*, mtClass> {
  37 
  38 public:
  39   ResolutionErrorTable(int table_size);
  40 
  41   ResolutionErrorEntry* new_entry(int hash, ConstantPool* pool, int cp_index, Symbol* error);
  42   void free_entry(ResolutionErrorEntry *entry);
  43 
  44   ResolutionErrorEntry* bucket(int i) {
  45     return (ResolutionErrorEntry*)Hashtable<ConstantPool*, mtClass>::bucket(i);
  46   }
  47 
  48   ResolutionErrorEntry** bucket_addr(int i) {
  49     return (ResolutionErrorEntry**)Hashtable<ConstantPool*, mtClass>::bucket_addr(i);
  50   }
  51 
  52   void add_entry(int index, ResolutionErrorEntry* new_entry) {
  53     Hashtable<ConstantPool*, mtClass>::add_entry(index,
  54       (HashtableEntry<ConstantPool*, mtClass>*)new_entry);
  55   }
  56 
  57   void add_entry(int index, unsigned int hash,
  58                  constantPoolHandle pool, int which, Symbol* error);
  59 
  60 
  61   // find error given the constant pool and constant pool index
  62   ResolutionErrorEntry* find_entry(int index, unsigned int hash,
  63                                    constantPoolHandle pool, int cp_index);
  64 
  65 
  66   unsigned int compute_hash(constantPoolHandle pool, int cp_index) {
  67     return (unsigned int) pool->identity_hash() + cp_index;
  68   }
  69 
  70   // purges unloaded entries from the table
  71   void purge_resolution_errors();
  72 
  73   // RedefineClasses support - remove obsolete constant pool entry
  74   void delete_entry(ConstantPool* c);
  75 };
  76 
  77 
  78 class ResolutionErrorEntry : public HashtableEntry<ConstantPool*, mtClass> {
  79  private:
  80   int               _cp_index;
  81   Symbol*           _error;
  82 
  83  public:
  84   ConstantPool*      pool() const               { return (ConstantPool*)literal(); }
  85   ConstantPool**   pool_addr()                { return (ConstantPool**)literal_addr(); }
  86 
  87   int                cp_index() const           { return _cp_index; }
  88   void               set_cp_index(int cp_index) { _cp_index = cp_index; }
  89 
  90   Symbol*            error() const              { return _error; }
  91   void               set_error(Symbol* e);
  92 
  93   ResolutionErrorEntry* next() const {
  94     return (ResolutionErrorEntry*)HashtableEntry<ConstantPool*, mtClass>::next();
  95   }
  96 
  97   ResolutionErrorEntry** next_addr() {
  98     return (ResolutionErrorEntry**)HashtableEntry<ConstantPool*, mtClass>::next_addr();
  99   }
 100 };
 101 
 102 #endif // SHARE_VM_CLASSFILE_RESOLUTIONERRORS_HPP