hotspot/src/share/vm/memory/barrierSet.inline.hpp
author brutisso
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7110718: -XX:MarkSweepAlwaysCompactCount=0 crashes the JVM Summary: Interpret MarkSweepAlwaysCompactCount < 1 as never do full compaction Reviewed-by: ysr, tonyp, jmasa, johnc
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/*
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 * Copyright (c) 2001, 2010, 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_MEMORY_BARRIERSET_INLINE_HPP
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#define SHARE_VM_MEMORY_BARRIERSET_INLINE_HPP
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#include "memory/barrierSet.hpp"
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#include "memory/cardTableModRefBS.hpp"
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// Inline functions of BarrierSet, which de-virtualize certain
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// performance-critical calls when the barrier is the most common
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// card-table kind.
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template <class T> void BarrierSet::write_ref_field_pre(T* field, oop new_val) {
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  if (kind() == CardTableModRef) {
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    ((CardTableModRefBS*)this)->inline_write_ref_field_pre(field, new_val);
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  } else {
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    write_ref_field_pre_work(field, new_val);
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  }
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}
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void BarrierSet::write_ref_field(void* field, oop new_val) {
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  if (kind() == CardTableModRef) {
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    ((CardTableModRefBS*)this)->inline_write_ref_field(field, new_val);
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  } else {
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    write_ref_field_work(field, new_val);
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  }
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}
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// count is number of array elements being written
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void BarrierSet::write_ref_array(HeapWord* start, size_t count) {
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  assert(count <= (size_t)max_intx, "count too large");
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  HeapWord* end = (HeapWord*)((char*)start + (count*heapOopSize));
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  // In the case of compressed oops, start and end may potentially be misaligned;
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  // so we need to conservatively align the first downward (this is not
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  // strictly necessary for current uses, but a case of good hygiene and,
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  // if you will, aesthetics) and the second upward (this is essential for
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  // current uses) to a HeapWord boundary, so we mark all cards overlapping
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  // this write. If this evolves in the future to calling a
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  // logging barrier of narrow oop granularity, like the pre-barrier for G1
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  // (mentioned here merely by way of example), we will need to change this
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  // interface, so it is "exactly precise" (if i may be allowed the adverbial
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  // redundancy for emphasis) and does not include narrow oop slots not
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  // included in the original write interval.
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  HeapWord* aligned_start = (HeapWord*)align_size_down((uintptr_t)start, HeapWordSize);
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  HeapWord* aligned_end   = (HeapWord*)align_size_up  ((uintptr_t)end,   HeapWordSize);
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  // If compressed oops were not being used, these should already be aligned
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  assert(UseCompressedOops || (aligned_start == start && aligned_end == end),
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         "Expected heap word alignment of start and end");
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#if 0
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  warning("Post:\t" INTPTR_FORMAT "[" SIZE_FORMAT "] : [" INTPTR_FORMAT","INTPTR_FORMAT")\t",
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                   start,            count,              aligned_start,   aligned_end);
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#endif
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  write_ref_array_work(MemRegion(aligned_start, aligned_end));
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}
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void BarrierSet::write_region(MemRegion mr) {
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  if (kind() == CardTableModRef) {
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    ((CardTableModRefBS*)this)->inline_write_region(mr);
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  } else {
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    write_region_work(mr);
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  }
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}
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#endif // SHARE_VM_MEMORY_BARRIERSET_INLINE_HPP