/*

 * Copyright (c) 2017, 2019, 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 "gc/z/zLock.inline.hpp"

#include "gc/z/zNMethodData.hpp"

#include "memory/allocation.hpp"

#include "runtime/atomic.hpp"

#include "runtime/orderAccess.hpp"

#include "utilities/align.hpp"

#include "utilities/debug.hpp"

#include "utilities/growableArray.hpp"

size_t ZNMethodDataOops::header_size() {

  const size_t size = sizeof(ZNMethodDataOops);

  assert(is_aligned(size, sizeof(oop*)), "Header misaligned");

  return size;

}

ZNMethodDataOops* ZNMethodDataOops::create(const GrowableArray<oop*>& immediates, bool has_non_immediates) {

  // Allocate memory for the ZNMethodDataOops object

  // plus the immediate oop* array that follows right after.

  const size_t size = ZNMethodDataOops::header_size() + (sizeof(oop*) * immediates.length());

  void* const mem = NEW_C_HEAP_ARRAY(uint8_t, size, mtGC);

  return ::new (mem) ZNMethodDataOops(immediates, has_non_immediates);

}

void ZNMethodDataOops::destroy(ZNMethodDataOops* oops) {

  FREE_C_HEAP_ARRAY(uint8_t, oops);

}

ZNMethodDataOops::ZNMethodDataOops(const GrowableArray<oop*>& immediates, bool has_non_immediates) :

    _nimmediates(immediates.length()),

    _has_non_immediates(has_non_immediates) {

  // Save all immediate oops

  for (size_t i = 0; i < _nimmediates; i++) {

    immediates_begin()[i] = immediates.at(i);

  }

}

size_t ZNMethodDataOops::immediates_count() const {

  return _nimmediates;

}

oop** ZNMethodDataOops::immediates_begin() const {

  // The immediate oop* array starts immediately after this object

  return (oop**)((uintptr_t)this + header_size());

}

oop** ZNMethodDataOops::immediates_end() const {

  return immediates_begin() + immediates_count();

}

bool ZNMethodDataOops::has_non_immediates() const {

  return _has_non_immediates;

}

ZNMethodData::ZNMethodData() :

    _lock(),

    _oops(NULL) {}

ZNMethodData::~ZNMethodData() {

  ZNMethodDataOops::destroy(_oops);

}

ZReentrantLock* ZNMethodData::lock() {

  return &_lock;

}

ZNMethodDataOops* ZNMethodData::oops() const {

  return OrderAccess::load_acquire(&_oops);

}

ZNMethodDataOops* ZNMethodData::swap_oops(ZNMethodDataOops* new_oops) {

  ZLocker<ZReentrantLock> locker(&_lock);

  ZNMethodDataOops* const old_oops = _oops;

  _oops = new_oops;

  return old_oops;

}