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 /*

  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.

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

  *

  * 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

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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(),

          "p not in range.");

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

   size_t result = delta >> LogN;

   assert(result < _vs.committed_size(), "bad index from address");

   return result;

 }

 inline HeapWord*

 G1BlockOffsetSharedArray::address_for_index(size_t index) const {

   assert(index < _vs.committed_size(), "bad index");

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

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

          "bad address from index");

   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