src/hotspot/share/gc/shared/modRefBarrierSet.inline.hpp
author eosterlund
Mon, 20 Nov 2017 13:07:44 +0100
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8189871: Refactor GC barriers to use declarative semantics Reviewed-by: pliden, rkennke, coleenp, dholmes, kbarrett, stefank
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/*
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 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_SHARED_MODREFBARRIERSET_INLINE_HPP
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#define SHARE_VM_GC_SHARED_MODREFBARRIERSET_INLINE_HPP
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#include "gc/shared/modRefBarrierSet.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/objArrayOop.hpp"
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#include "oops/oop.hpp"
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template <DecoratorSet decorators, typename BarrierSetT>
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template <typename T>
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inline void ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
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oop_store_in_heap(T* addr, oop value) {
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  BarrierSetT *bs = barrier_set_cast<BarrierSetT>(barrier_set());
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  bs->template write_ref_field_pre<decorators>(addr);
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  Raw::oop_store(addr, value);
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  bs->template write_ref_field_post<decorators>(addr, value);
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}
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template <DecoratorSet decorators, typename BarrierSetT>
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template <typename T>
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inline oop ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
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oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value) {
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  BarrierSetT *bs = barrier_set_cast<BarrierSetT>(barrier_set());
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  bs->template write_ref_field_pre<decorators>(addr);
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  oop result = Raw::oop_atomic_cmpxchg(new_value, addr, compare_value);
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  if (result == compare_value) {
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    bs->template write_ref_field_post<decorators>(addr, new_value);
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  }
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  return result;
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}
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template <DecoratorSet decorators, typename BarrierSetT>
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template <typename T>
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inline oop ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
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oop_atomic_xchg_in_heap(oop new_value, T* addr) {
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  BarrierSetT *bs = barrier_set_cast<BarrierSetT>(barrier_set());
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  bs->template write_ref_field_pre<decorators>(addr);
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  oop result = Raw::oop_atomic_xchg(new_value, addr);
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  bs->template write_ref_field_post<decorators>(addr, new_value);
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  return result;
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}
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template <DecoratorSet decorators, typename BarrierSetT>
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template <typename T>
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inline bool ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
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oop_arraycopy_in_heap(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length) {
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  BarrierSetT *bs = barrier_set_cast<BarrierSetT>(barrier_set());
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  if (!HasDecorator<decorators, ARRAYCOPY_CHECKCAST>::value) {
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    // Optimized covariant case
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    bs->write_ref_array_pre(dst, (int)length,
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                            HasDecorator<decorators, ARRAYCOPY_DEST_NOT_INITIALIZED>::value);
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    Raw::oop_arraycopy(src_obj, dst_obj, src, dst, length);
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    bs->write_ref_array((HeapWord*)dst, length);
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  } else {
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    Klass* bound = objArrayOop(dst_obj)->element_klass();
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    T* from = src;
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    T* end = from + length;
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    for (T* p = dst; from < end; from++, p++) {
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      T element = *from;
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      if (bound->is_instanceof_or_null(element)) {
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        bs->template write_ref_field_pre<decorators>(p);
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        *p = element;
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      } else {
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        // We must do a barrier to cover the partial copy.
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        const size_t pd = pointer_delta(p, dst, (size_t)heapOopSize);
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        // pointer delta is scaled to number of elements (length field in
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        // objArrayOop) which we assume is 32 bit.
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        assert(pd == (size_t)(int)pd, "length field overflow");
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        bs->write_ref_array((HeapWord*)dst, pd);
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        return false;
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      }
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    }
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    bs->write_ref_array((HeapWord*)dst, length);
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  }
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  return true;
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}
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template <DecoratorSet decorators, typename BarrierSetT>
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inline void ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT>::
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clone_in_heap(oop src, oop dst, size_t size) {
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  Raw::clone(src, dst, size);
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  BarrierSetT *bs = barrier_set_cast<BarrierSetT>(barrier_set());
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  bs->write_region(MemRegion((HeapWord*)(void*)dst, size));
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}
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#endif // SHARE_VM_GC_SHARED_MODREFBARRIERSET_INLINE_HPP