8221766: Load-reference barriers for Shenandoah
Reviewed-by: kvn, erikj, aph, shade
/*
* Copyright (c) 2018, Red Hat, Inc. All rights reserved.
*
* 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
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*/
#include "precompiled.hpp"
#include "gc/shenandoah/shenandoahBarrierSet.hpp"
#include "gc/shenandoah/shenandoahRuntime.hpp"
#include "gc/shenandoah/shenandoahThreadLocalData.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "oops/oop.inline.hpp"
void ShenandoahRuntime::write_ref_array_pre_oop_entry(oop* dst, size_t length) {
ShenandoahBarrierSet *bs = ShenandoahBarrierSet::barrier_set();
bs->write_ref_array_pre(dst, length, false);
}
void ShenandoahRuntime::write_ref_array_pre_narrow_oop_entry(narrowOop* dst, size_t length) {
ShenandoahBarrierSet *bs = ShenandoahBarrierSet::barrier_set();
bs->write_ref_array_pre(dst, length, false);
}
void ShenandoahRuntime::write_ref_array_post_entry(HeapWord* dst, size_t length) {
ShenandoahBarrierSet *bs = ShenandoahBarrierSet::barrier_set();
bs->ShenandoahBarrierSet::write_ref_array(dst, length);
}
// Shenandoah pre write barrier slowpath
JRT_LEAF(void, ShenandoahRuntime::write_ref_field_pre_entry(oopDesc* orig, JavaThread *thread))
if (orig == NULL) {
assert(false, "should be optimized out");
return;
}
shenandoah_assert_correct(NULL, orig);
// store the original value that was in the field reference
assert(ShenandoahThreadLocalData::satb_mark_queue(thread).is_active(), "Shouldn't be here otherwise");
ShenandoahThreadLocalData::satb_mark_queue(thread).enqueue_known_active(orig);
JRT_END
JRT_LEAF(oopDesc*, ShenandoahRuntime::load_reference_barrier_JRT(oopDesc* src))
oop result = ShenandoahBarrierSet::barrier_set()->load_reference_barrier_mutator(src);
return (oopDesc*) result;
JRT_END
// Shenandoah clone barrier: makes sure that references point to to-space
// in cloned objects.
JRT_LEAF(void, ShenandoahRuntime::shenandoah_clone_barrier(oopDesc* obj))
ShenandoahBarrierSet::barrier_set()->write_region(MemRegion((HeapWord*) obj, obj->size()));
JRT_END