1 /*
   2  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. 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 
  25 #include "precompiled.hpp"
  26 #include "gc/shared/modRefBarrierSet.inline.hpp"
  27 #include "gc/shared/collectedHeap.hpp"
  28 #include "memory/universe.hpp"
  29 #include "oops/klass.hpp"
  30 #include "oops/objArrayKlass.inline.hpp"
  31 
  32 // count is number of array elements being written
  33 void ModRefBarrierSet::static_write_ref_array_pre(HeapWord* start, size_t count) {
  34   assert(count <= (size_t)max_intx, "count too large");
  35   ModRefBarrierSet *bs = barrier_set_cast<ModRefBarrierSet>(Universe::heap()->barrier_set());
  36   if (UseCompressedOops) {
  37     bs->write_ref_array_pre((narrowOop*)start, (int)count, false);
  38   } else {
  39     bs->write_ref_array_pre(      (oop*)start, (int)count, false);
  40   }
  41 }
  42 
  43 // count is number of array elements being written
  44 void ModRefBarrierSet::static_write_ref_array_post(HeapWord* start, size_t count) {
  45   // simply delegate to instance method
  46   ModRefBarrierSet *bs = barrier_set_cast<ModRefBarrierSet>(Universe::heap()->barrier_set());
  47   bs->write_ref_array(start, count);
  48 }
  49 
  50 void ModRefBarrierSet::klass_update_barrier_set(Klass* klass, oop* p, oop v) {
  51   klass->record_modified_oops();
  52 }
  53 
  54 Klass* ModRefBarrierSet::bound_for_array(oop obj) {
  55   return ObjArrayKlass::cast(obj->klass())->element_klass();
  56 }
  57 
  58 bool ModRefBarrierSet::is_bounded_by(oop obj, Klass* klass) {
  59   return obj->klass()->is_subtype_of(klass);
  60 }