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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

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 * 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.

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#ifndef SHARE_VM_GC_SHARED_BARRIERSET_INLINE_HPP

#define SHARE_VM_GC_SHARED_BARRIERSET_INLINE_HPP

#include "gc/shared/barrierSet.hpp"

#include "gc/shared/cardTableModRefBS.inline.hpp"

#include "utilities/align.hpp"

// Inline functions of BarrierSet, which de-virtualize certain

// performance-critical calls when the barrier is the most common

// card-table kind.

inline bool BarrierSet::devirtualize_reference_writes() const {

  switch (kind()) {

  case CardTableForRS:

  case CardTableExtension:

    return true;

  default:

    return false;

  }

}

template <class T> void BarrierSet::write_ref_field_pre(T* field, oop new_val) {

  if (devirtualize_reference_writes()) {

    barrier_set_cast<CardTableModRefBS>(this)->inline_write_ref_field_pre(field, new_val);

  } else {

    write_ref_field_pre_work(field, new_val);

  }

}

void BarrierSet::write_ref_field(void* field, oop new_val, bool release) {

  if (devirtualize_reference_writes()) {

    barrier_set_cast<CardTableModRefBS>(this)->inline_write_ref_field(field, new_val, release);

  } else {

    write_ref_field_work(field, new_val, release);

  }

}

// count is number of array elements being written

void BarrierSet::write_ref_array(HeapWord* start, size_t count) {

  assert(count <= (size_t)max_intx, "count too large");

  HeapWord* end = (HeapWord*)((char*)start + (count*heapOopSize));

  // In the case of compressed oops, start and end may potentially be misaligned;

  // so we need to conservatively align the first downward (this is not

  // strictly necessary for current uses, but a case of good hygiene and,

  // if you will, aesthetics) and the second upward (this is essential for

  // current uses) to a HeapWord boundary, so we mark all cards overlapping

  // this write. If this evolves in the future to calling a

  // logging barrier of narrow oop granularity, like the pre-barrier for G1

  // (mentioned here merely by way of example), we will need to change this

  // interface, so it is "exactly precise" (if i may be allowed the adverbial

  // redundancy for emphasis) and does not include narrow oop slots not

  // included in the original write interval.

  HeapWord* aligned_start = align_down(start, HeapWordSize);

  HeapWord* aligned_end   = align_up  (end,   HeapWordSize);

  // If compressed oops were not being used, these should already be aligned

  assert(UseCompressedOops || (aligned_start == start && aligned_end == end),

         "Expected heap word alignment of start and end");

  write_ref_array_work(MemRegion(aligned_start, aligned_end));

}

inline void BarrierSet::write_region(MemRegion mr) {

  if (devirtualize_reference_writes()) {

    barrier_set_cast<CardTableModRefBS>(this)->inline_write_region(mr);

  } else {

    write_region_work(mr);

  }

}

#endif // SHARE_VM_GC_SHARED_BARRIERSET_INLINE_HPP