/*

 * Copyright (c) 2005, 2017, 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/constantPool.hpp"

#include "utilities/hashtable.hpp"

class ResolutionErrorEntry;

// ResolutionError objects are used to record errors encountered during

// constant pool resolution (JVMS 5.4.3).

// This value is added to the cpCache index of an invokedynamic instruction when

// storing the resolution error resulting from that invokedynamic instruction.

// This prevents issues where the cpCache index is the same as the constant pool

// index of another entry in the table.

const int CPCACHE_INDEX_MANGLE_VALUE = 1000000;

class ResolutionErrorTable : public Hashtable<ConstantPool*, mtClass> {

public:

  ResolutionErrorTable(int table_size);

  ResolutionErrorEntry* new_entry(int hash, ConstantPool* pool, int cp_index,

                                  Symbol* error, Symbol* message);

  void free_entry(ResolutionErrorEntry *entry);

  ResolutionErrorEntry* bucket(int i) {

    return (ResolutionErrorEntry*)Hashtable<ConstantPool*, mtClass>::bucket(i);

  }

  ResolutionErrorEntry** bucket_addr(int i) {

    return (ResolutionErrorEntry**)Hashtable<ConstantPool*, mtClass>::bucket_addr(i);

  }

  void add_entry(int index, ResolutionErrorEntry* new_entry) {

    Hashtable<ConstantPool*, mtClass>::add_entry(index,

      (HashtableEntry<ConstantPool*, mtClass>*)new_entry);

  }

  void add_entry(int index, unsigned int hash,

                 const constantPoolHandle& pool, int which, Symbol* error, Symbol* message);

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

  ResolutionErrorEntry* find_entry(int index, unsigned int hash,

                                   const constantPoolHandle& pool, int cp_index);

  unsigned int compute_hash(const constantPoolHandle& pool, int cp_index) {

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

  }

  // purges unloaded entries from the table

  void purge_resolution_errors();

  // RedefineClasses support - remove obsolete constant pool entry

  void delete_entry(ConstantPool* c);

  // This function is used to encode an index to differentiate it from a

  // constant pool index.  It assumes it is being called with a cpCache index

  // (that is less than 0).

  static int encode_cpcache_index(int index) {

    assert(index < 0, "Unexpected non-negative cpCache index");

    return index + CPCACHE_INDEX_MANGLE_VALUE;

  }

};

class ResolutionErrorEntry : public HashtableEntry<ConstantPool*, mtClass> {

 private:

  int               _cp_index;

  Symbol*           _error;

  Symbol*           _message;

 public:

  ConstantPool*      pool() const               { return literal(); }

  int                cp_index() const           { return _cp_index; }

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

  Symbol*            error() const              { return _error; }

  void               set_error(Symbol* e);

  Symbol*            message() const            { return _message; }

  void               set_message(Symbol* c);

  ResolutionErrorEntry* next() const {

    return (ResolutionErrorEntry*)HashtableEntry<ConstantPool*, mtClass>::next();

  }

  ResolutionErrorEntry** next_addr() {

    return (ResolutionErrorEntry**)HashtableEntry<ConstantPool*, mtClass>::next_addr();

  }

};

#endif // SHARE_VM_CLASSFILE_RESOLUTIONERRORS_HPP