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_implementation/shenandoah/shenandoahBarrierSet.hpp"
  26 #include "gc_implementation/shenandoah/shenandoahRuntime.hpp"
  27 #include "runtime/interfaceSupport.hpp"
  28 #include "oops/oop.inline.hpp"
  29 
  30 void ShenandoahRuntime::write_ref_array_pre_oop_entry(oop* dst, size_t length) {
  31   ShenandoahBarrierSet *bs = ShenandoahBarrierSet::barrier_set();
  32   assert(length <= INT_MAX, err_msg("sanity: " SIZE_FORMAT, length));
  33   bs->write_ref_array_pre(dst, (int)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   assert(length <= INT_MAX, err_msg("sanity: " SIZE_FORMAT, length));
  39   bs->write_ref_array_pre(dst, (int)length, false);
  40 }
  41 
  42 void ShenandoahRuntime::write_ref_array_post_entry(HeapWord* dst, size_t length) {
  43   ShenandoahBarrierSet *bs = ShenandoahBarrierSet::barrier_set();
  44   bs->ShenandoahBarrierSet::write_ref_array(dst, length);
  45 }
  46 
  47 // Shenandoah pre write barrier slowpath
  48 JRT_LEAF(void, ShenandoahRuntime::write_ref_field_pre_entry(oopDesc* orig, JavaThread *thread))
  49   if (orig == NULL) {
  50     assert(false, "should be optimized out");
  51     return;
  52   }
  53   shenandoah_assert_correct(NULL, orig);
  54   // store the original value that was in the field reference
  55   assert(thread->satb_mark_queue().is_active(), "Shouldn't be here otherwise");
  56   thread->satb_mark_queue().enqueue_known_active(orig);
  57 JRT_END
  58 
  59 JRT_LEAF(oopDesc*, ShenandoahRuntime::load_reference_barrier_JRT(oopDesc* src))
  60   oop result = ShenandoahBarrierSet::barrier_set()->load_reference_barrier_mutator(oop(src));
  61   return (oopDesc*) result;
  62 JRT_END
  63 
  64 IRT_LEAF(oopDesc*, ShenandoahRuntime::load_reference_barrier_interpreter(oopDesc* src))
  65   oop result = ShenandoahBarrierSet::barrier_set()->load_reference_barrier(oop(src));
  66   return (oopDesc*) result;
  67 IRT_END
  68 
  69 // Shenandoah clone barrier: makes sure that references point to to-space
  70 // in cloned objects.
  71 JRT_LEAF(void, ShenandoahRuntime::shenandoah_clone_barrier(oopDesc* obj))
  72   ShenandoahBarrierSet::barrier_set()->write_region(MemRegion((HeapWord*) obj, obj->size()));
  73 JRT_END