1 /*
   2  * Copyright (c) 2019, Red Hat, Inc. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #ifndef SHARE_GC_SHARED_BARRIERSET_INLINE_HPP
  25 #define SHARE_GC_SHARED_BARRIERSET_INLINE_HPP
  26 
  27 #include "gc/shared/barrierSet.hpp"
  28 #include "oops/accessDecorators.hpp"
  29 #include "oops/arrayOop.hpp"
  30 #include "oops/compressedOops.inline.hpp"
  31 #include "oops/objArrayOop.inline.hpp"
  32 #include "oops/oop.hpp"
  33 
  34 template <DecoratorSet decorators, typename BarrierSetT>
  35 template <typename T>
  36 inline void BarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
  37                                                                                       arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
  38                                                                                       size_t length) {
  39   T* src = arrayOopDesc::obj_offset_to_raw(src_obj, src_offset_in_bytes, src_raw);
  40   T* dst = arrayOopDesc::obj_offset_to_raw(dst_obj, dst_offset_in_bytes, dst_raw);
  41 
  42   if ((!HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value) &&
  43       (!HasDecorator<decorators, ARRAYCOPY_NOTNULL>::value)) {
  44     // Covariant, copy without checks
  45     Raw::oop_arraycopy(NULL, 0, src, NULL, 0, dst, length);
  46     return;
  47   }
  48 
  49   // Copy each element with checking casts
  50   Klass* const dst_klass = objArrayOop(dst_obj)->element_klass();
  51   for (const T* const end = src + length; src < end; src++, dst++) {
  52     const T elem = *src;
  53     if (HasDecorator<decorators, ARRAYCOPY_NOTNULL>::value && CompressedOops::is_null(elem)) {
  54       throw_array_null_pointer_store_exception(src_obj, dst_obj, Thread::current());
  55       return;
  56     }
  57     if (HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value &&
  58         (!oopDesc::is_instanceof_or_null(CompressedOops::decode(elem), dst_klass))) {
  59       throw_array_store_exception(src_obj, dst_obj, Thread::current());
  60       return;
  61     }
  62     *dst = elem;
  63   }
  64 }
  65 
  66 #endif // SHARE_GC_SHARED_BARRIERSET_INLINE_HPP