/*

 * Copyright (c) 2019, Red Hat, Inc. 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 "gc/shared/barrierSet.hpp"

#include "oops/accessDecorators.hpp"

#include "oops/arrayOop.hpp"

#include "oops/compressedOops.inline.hpp"

#include "oops/objArrayOop.inline.hpp"

#include "oops/oop.hpp"

template <DecoratorSet decorators, typename BarrierSetT>

template <typename T>

inline bool BarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,

                                                                                      arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,

                                                                                      size_t length) {

  T* src = arrayOopDesc::obj_offset_to_raw(src_obj, src_offset_in_bytes, src_raw);

  T* dst = arrayOopDesc::obj_offset_to_raw(dst_obj, dst_offset_in_bytes, dst_raw);

  if (!HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value) {

    // Covariant, copy without checks

    return Raw::oop_arraycopy(NULL, 0, src, NULL, 0, dst, length);

  }

  // Copy each element with checking casts

  Klass* const dst_klass = objArrayOop(dst_obj)->element_klass();

  for (const T* const end = src + length; src < end; src++, dst++) {

    const T elem = *src;

    if (!oopDesc::is_instanceof_or_null(CompressedOops::decode(elem), dst_klass)) {

      return false;

    }

    *dst = elem;

  }

  return true;

}