/*

 * Copyright (c) 2005, 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

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 */

#ifndef SHARE_VM_CLASSFILE_RESOLUTIONERRORS_HPP

#define SHARE_VM_CLASSFILE_RESOLUTIONERRORS_HPP

#include "oops/constantPoolOop.hpp"

#include "utilities/hashtable.hpp"

class ResolutionErrorEntry;

// ResolutionError objects are used to record errors encountered during

// constant pool resolution (JVMS 5.4.3).

class ResolutionErrorTable : public Hashtable {

public:

  ResolutionErrorTable(int table_size);

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

  ResolutionErrorEntry* bucket(int i) {

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

  }

  ResolutionErrorEntry** bucket_addr(int i) {

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

  }

  void add_entry(int index, ResolutionErrorEntry* new_entry) {

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

  }

  void add_entry(int index, unsigned int hash,

                 constantPoolHandle pool, int which, symbolHandle error);

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

  ResolutionErrorEntry* find_entry(int index, unsigned int hash,

                                   constantPoolHandle pool, int cp_index);

  unsigned int compute_hash(constantPoolHandle pool, int cp_index) {

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

  }

  // purges unloaded entries from the table

  void purge_resolution_errors(BoolObjectClosure* is_alive);

  // this table keeps symbolOops alive

  void always_strong_classes_do(OopClosure* blk);

  // GC support.

  void oops_do(OopClosure* f);

};

class ResolutionErrorEntry : public HashtableEntry {

 private:

  int               _cp_index;

  symbolOop         _error;

 public:

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

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

  int                cp_index() const           { return _cp_index; }

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

  symbolOop          error() const              { return _error; }

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

  symbolOop*         error_addr()               { return &_error; }

  ResolutionErrorEntry* next() const {

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

  }

  ResolutionErrorEntry** next_addr() {

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

  }

  // GC support

  void oops_do(OopClosure* blk);

};

#endif // SHARE_VM_CLASSFILE_RESOLUTIONERRORS_HPP