/*

 * Copyright (c) 2017, 2018, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP

#define SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP

#include "oops/symbol.hpp"

#include "oops/weakHandle.hpp"

#include "utilities/hashtable.hpp"

// Hashtable to record Method* used in ResolvedMethods, via. ResolvedMethod oops.

// This is needed for redefinition to replace Method* with redefined versions.

// Entry in a ResolvedMethodTable, mapping a ClassLoaderWeakHandle for a single oop of

// java_lang_invoke_ResolvedMethodName which holds JVM Method* in vmtarget.

class ResolvedMethodEntry : public HashtableEntry<ClassLoaderWeakHandle, mtClass> {

 public:

  ResolvedMethodEntry* next() const {

    return (ResolvedMethodEntry*)HashtableEntry<ClassLoaderWeakHandle, mtClass>::next();

  }

  ResolvedMethodEntry** next_addr() {

    return (ResolvedMethodEntry**)HashtableEntry<ClassLoaderWeakHandle, mtClass>::next_addr();

  }

  oop object();

  oop object_no_keepalive();

  void print_on(outputStream* st) const;

};

class ResolvedMethodTable : public Hashtable<ClassLoaderWeakHandle, mtClass> {

  enum Constants {

    _table_size  = 1007

  };

  static int _total_oops_removed;

  static bool _dead_entries;

  static ResolvedMethodTable* _the_table;

private:

  ResolvedMethodEntry* bucket(int i) {

    return (ResolvedMethodEntry*) Hashtable<ClassLoaderWeakHandle, mtClass>::bucket(i);

  }

  ResolvedMethodEntry** bucket_addr(int i) {

    return (ResolvedMethodEntry**) Hashtable<ClassLoaderWeakHandle, mtClass>::bucket_addr(i);

  }

  unsigned int compute_hash(Method* method);

  // need not be locked; no state change

  oop lookup(int index, unsigned int hash, Method* method);

  oop lookup(Method* method);

  // must be done under ResolvedMethodTable_lock

  oop basic_add(Method* method, Handle rmethod_name);

public:

  ResolvedMethodTable();

  static void create_table() {

    assert(_the_table == NULL, "One symbol table allowed.");

    _the_table = new ResolvedMethodTable();

  }

  // Called from java_lang_invoke_ResolvedMethodName

  static oop find_method(Method* method);

  static oop add_method(Handle rmethod_name);

  static bool has_work() { return _dead_entries; }

  static void trigger_cleanup();

  static int removed_entries_count() { return _total_oops_removed; };

#if INCLUDE_JVMTI

  // It is called at safepoint only for RedefineClasses

  static void adjust_method_entries(bool * trace_name_printed);

#endif // INCLUDE_JVMTI

  // Cleanup cleared entries

  static void unlink();

#ifndef PRODUCT

  void print();

#endif

  void verify();

};

#endif // SHARE_VM_PRIMS_RESOLVEDMETHOD_HPP