/*
 * 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_GC_Z_ZNMETHODTABLE_HPP
#define SHARE_GC_Z_ZNMETHODTABLE_HPP

#include "gc/z/zArray.hpp"
#include "gc/z/zGlobals.hpp"
#include "gc/z/zLock.hpp"
#include "gc/z/zNMethodTableEntry.hpp"
#include "memory/allocation.hpp"

class ZWorkers;

class ZNMethodTableEntryClosure {
public:
  virtual void do_nmethod_entry(ZNMethodTableEntry entry) = 0;
};

class ZNMethodTable : public AllStatic {
private:
  static ZNMethodTableEntry* _table;
  static size_t              _size;
  static ZLock               _iter_lock;
  static ZNMethodTableEntry* _iter_table;
  static size_t              _iter_table_size;
  static ZArray<void*>       _iter_deferred_deletes;
  static size_t              _nregistered;
  static size_t              _nunregistered;
  static volatile size_t     _claimed ATTRIBUTE_ALIGNED(ZCacheLineSize);

  static ZNMethodTableEntry create_entry(nmethod* nm);

  static size_t first_index(const nmethod* nm, size_t size);
  static size_t next_index(size_t prev_index, size_t size);

  static void sweeper_wait_for_iteration();

  static bool register_entry(ZNMethodTableEntry* table, size_t size, ZNMethodTableEntry entry);
  static void unregister_entry(ZNMethodTableEntry* table, size_t size, nmethod* nm);

  static void rebuild(size_t new_size);
  static void rebuild_if_needed();

  static void log_register(const nmethod* nm, ZNMethodTableEntry entry);
  static void log_unregister(const nmethod* nm);

public:
  static void safe_delete(void* data);

  static size_t registered_nmethods();
  static size_t unregistered_nmethods();

  static void register_nmethod(nmethod* nm);
  static void unregister_nmethod(nmethod* nm);
  static void flush_nmethod(nmethod* nm);
  static void disarm_nmethod(nmethod* nm);

  static ZReentrantLock* lock_for_nmethod(nmethod* nm);

  static void oops_do(OopClosure* cl);

  static void entry_oops_do(ZNMethodTableEntry entry, OopClosure* cl);

  static void nmethod_entries_do_begin();
  static void nmethod_entries_do_end();
  static void nmethod_entries_do(ZNMethodTableEntryClosure* cl);

  static void unlink(ZWorkers* workers, bool unloading_occurred);
  static void purge(ZWorkers* workers);
};

#endif // SHARE_GC_Z_ZNMETHODTABLE_HPP