/*

 * Copyright (c) 2014, 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.

 *

 */

#include "precompiled.hpp"

#include "classfile/stringTable.hpp"

#include "gc/shared/stringdedup/stringDedup.hpp"

#include "gc/shared/stringdedup/stringDedupQueue.hpp"

#include "gc/shared/stringdedup/stringDedupQueue.inline.hpp"

#include "gc/shared/stringdedup/stringDedupTable.hpp"

#include "gc/shared/stringdedup/stringDedupThread.hpp"

#include "gc/shared/suspendibleThreadSet.hpp"

#include "logging/log.hpp"

#include "oops/access.inline.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/atomic.hpp"

StringDedupThread* StringDedupThread::_thread = NULL;

StringDedupThread::StringDedupThread() :

  ConcurrentGCThread() {

  set_name("StrDedup");

  create_and_start();

}

StringDedupThread::~StringDedupThread() {

  ShouldNotReachHere();

}

StringDedupThread* StringDedupThread::thread() {

  assert(_thread != NULL, "String deduplication thread not created");

  return _thread;

}

class StringDedupSharedClosure: public OopClosure {

 private:

  StringDedupStat* _stat;

 public:

  StringDedupSharedClosure(StringDedupStat* stat) : _stat(stat) {}

  virtual void do_oop(oop* p) { ShouldNotReachHere(); }

  virtual void do_oop(narrowOop* p) {

    oop java_string = RawAccess<>::oop_load(p);

    StringDedupTable::deduplicate(java_string, _stat);

  }

};

// The CDS archive does not include the string dedupication table. Only the string

// table is saved in the archive. The shared strings from CDS archive need to be

// added to the string dedupication table before deduplication occurs. That is

// done in the begining of the StringDedupThread (see StringDedupThread::do_deduplication()).

void StringDedupThread::deduplicate_shared_strings(StringDedupStat* stat) {

  StringDedupSharedClosure sharedStringDedup(stat);

  StringTable::shared_oops_do(&sharedStringDedup);

}

void StringDedupThread::stop_service() {

  StringDedupQueue::cancel_wait();

}

void StringDedupThread::print_start(const StringDedupStat* last_stat) {

  StringDedupStat::print_start(last_stat);

}

void StringDedupThread::print_end(const StringDedupStat* last_stat, const StringDedupStat* total_stat) {

  StringDedupStat::print_end(last_stat, total_stat);

  if (log_is_enabled(Debug, gc, stringdedup)) {

    last_stat->print_statistics(false);

    total_stat->print_statistics(true);

    StringDedupTable::print_statistics();

    StringDedupQueue::print_statistics();

  }

}