1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #include "precompiled.hpp"
  25 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
  26 #include "gc/shenandoah/shenandoahRuntime.hpp"
  27 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
  28 #include "runtime/interfaceSupport.inline.hpp"
  29 #include "oops/oop.inline.hpp"
  30 
  31 void ShenandoahRuntime::write_ref_array_pre_oop_entry(oop* dst, size_t length) {
  32   ShenandoahBarrierSet *bs = ShenandoahBarrierSet::barrier_set();
  33   bs->write_ref_array_pre(dst, length, false);
  34 }
  35 
  36 void ShenandoahRuntime::write_ref_array_pre_narrow_oop_entry(narrowOop* dst, size_t length) {
  37   ShenandoahBarrierSet *bs = ShenandoahBarrierSet::barrier_set();
  38   bs->write_ref_array_pre(dst, length, false);
  39 }
  40 
  41 void ShenandoahRuntime::write_ref_array_post_entry(HeapWord* dst, size_t length) {
  42   ShenandoahBarrierSet *bs = ShenandoahBarrierSet::barrier_set();
  43   bs->ShenandoahBarrierSet::write_ref_array(dst, length);
  44 }
  45 
  46 // Shenandoah pre write barrier slowpath
  47 JRT_LEAF(void, ShenandoahRuntime::write_ref_field_pre_entry(oopDesc* orig, JavaThread *thread))
  48   if (orig == NULL) {
  49     assert(false, "should be optimized out");
  50     return;
  51   }
  52   shenandoah_assert_correct(NULL, orig);
  53   // store the original value that was in the field reference
  54   assert(ShenandoahThreadLocalData::satb_mark_queue(thread).is_active(), "Shouldn't be here otherwise");
  55   ShenandoahThreadLocalData::satb_mark_queue(thread).enqueue_known_active(orig);
  56 JRT_END
  57 
  58 JRT_LEAF(oopDesc*, ShenandoahRuntime::load_reference_barrier(oopDesc * src))
  59   oop result = ShenandoahBarrierSet::barrier_set()->load_reference_barrier_mutator(src);
  60   return (oopDesc*) result;
  61 JRT_END
  62 
  63 // Shenandoah clone barrier: makes sure that references point to to-space
  64 // in cloned objects.
  65 JRT_LEAF(void, ShenandoahRuntime::shenandoah_clone_barrier(oopDesc* obj))
  66   ShenandoahBarrierSet::barrier_set()->write_region(MemRegion((HeapWord*) obj, obj->size()));
  67 JRT_END