/*

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

 *

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 * 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.

 *

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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_INLINE_HPP

#define SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_INLINE_HPP

#include "gc_implementation/g1/g1BlockOffsetTable.hpp"

#include "memory/space.hpp"

inline HeapWord* G1BlockOffsetTable::block_start(const void* addr) {

  if (addr >= _bottom && addr < _end) {

    return block_start_unsafe(addr);

  } else {

    return NULL;

  }

}

inline HeapWord*

G1BlockOffsetTable::block_start_const(const void* addr) const {

  if (addr >= _bottom && addr < _end) {

    return block_start_unsafe_const(addr);

  } else {

    return NULL;

  }

}

inline size_t G1BlockOffsetSharedArray::index_for(const void* p) const {

  char* pc = (char*)p;

  assert(pc >= (char*)_reserved.start() &&

         pc <  (char*)_reserved.end(),

         err_msg("p (" PTR_FORMAT ") not in reserved [" PTR_FORMAT ", " PTR_FORMAT ")",

                 p, (char*)_reserved.start(), (char*)_reserved.end()));

  size_t delta = pointer_delta(pc, _reserved.start(), sizeof(char));

  size_t result = delta >> LogN;

  check_index(result, "bad index from address");

  return result;

}

inline HeapWord*

G1BlockOffsetSharedArray::address_for_index(size_t index) const {

  check_index(index, "index out of range");

  HeapWord* result = _reserved.start() + (index << LogN_words);

  assert(result >= _reserved.start() && result < _reserved.end(),

         err_msg("bad address from index result " PTR_FORMAT

                 " _reserved.start() " PTR_FORMAT " _reserved.end() "

                 PTR_FORMAT,

                 result, _reserved.start(), _reserved.end()));

  return result;

}

inline HeapWord*

G1BlockOffsetArray::block_at_or_preceding(const void* addr,

                                          bool has_max_index,

                                          size_t max_index) const {

  assert(_array->offset_array(0) == 0, "objects can't cross covered areas");

  size_t index = _array->index_for(addr);

  // We must make sure that the offset table entry we use is valid.  If

  // "addr" is past the end, start at the last known one and go forward.

  if (has_max_index) {

    index = MIN2(index, max_index);

  }

  HeapWord* q = _array->address_for_index(index);

  uint offset = _array->offset_array(index);  // Extend u_char to uint.

  while (offset >= N_words) {

    // The excess of the offset from N_words indicates a power of Base

    // to go back by.

    size_t n_cards_back = BlockOffsetArray::entry_to_cards_back(offset);

    q -= (N_words * n_cards_back);

    assert(q >= _sp->bottom(), "Went below bottom!");

    index -= n_cards_back;

    offset = _array->offset_array(index);

  }

  assert(offset < N_words, "offset too large");

  q -= offset;

  return q;

}

inline HeapWord*

G1BlockOffsetArray::

forward_to_block_containing_addr_const(HeapWord* q, HeapWord* n,

                                       const void* addr) const {

  if (csp() != NULL) {

    if (addr >= csp()->top()) return csp()->top();

    while (n <= addr) {

      q = n;

      oop obj = oop(q);

      if (obj->klass_or_null() == NULL) return q;

      n += obj->size();

    }

  } else {

    while (n <= addr) {

      q = n;

      oop obj = oop(q);

      if (obj->klass_or_null() == NULL) return q;

      n += _sp->block_size(q);

    }

  }

  assert(q <= n, "wrong order for q and addr");

  assert(addr < n, "wrong order for addr and n");

  return q;

}

inline HeapWord*

G1BlockOffsetArray::forward_to_block_containing_addr(HeapWord* q,

                                                     const void* addr) {

  if (oop(q)->klass_or_null() == NULL) return q;

  HeapWord* n = q + _sp->block_size(q);

  // In the normal case, where the query "addr" is a card boundary, and the

  // offset table chunks are the same size as cards, the block starting at

  // "q" will contain addr, so the test below will fail, and we'll fall

  // through quickly.

  if (n <= addr) {

    q = forward_to_block_containing_addr_slow(q, n, addr);

  }

  assert(q <= addr, "wrong order for current and arg");

  return q;

}

//////////////////////////////////////////////////////////////////////////

// BlockOffsetArrayNonContigSpace inlines

//////////////////////////////////////////////////////////////////////////

inline void G1BlockOffsetArray::freed(HeapWord* blk_start, HeapWord* blk_end) {

  // Verify that the BOT shows [blk_start, blk_end) to be one block.

  verify_single_block(blk_start, blk_end);

  // adjust _unallocated_block upward or downward

  // as appropriate

  if (BlockOffsetArrayUseUnallocatedBlock) {

    assert(_unallocated_block <= _end,

           "Inconsistent value for _unallocated_block");

    if (blk_end >= _unallocated_block && blk_start <= _unallocated_block) {

      // CMS-specific note: a block abutting _unallocated_block to

      // its left is being freed, a new block is being added or

      // we are resetting following a compaction

      _unallocated_block = blk_start;

    }

  }

}

inline void G1BlockOffsetArray::freed(HeapWord* blk, size_t size) {

  freed(blk, blk + size);

}

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_INLINE_HPP