1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_G1CONCURRENTMARKBITMAP_INLINE_HPP
  26 #define SHARE_VM_GC_G1_G1CONCURRENTMARKBITMAP_INLINE_HPP
  27 
  28 #include "gc/g1/g1ConcurrentMarkBitMap.hpp"
  29 #include "memory/memRegion.hpp"
  30 #include "utilities/align.hpp"
  31 #include "utilities/bitMap.inline.hpp"
  32 
  33 inline bool G1CMBitMap::iterate(G1CMBitMapClosure* cl, MemRegion mr) {
  34   assert(!mr.is_empty(), "Does not support empty memregion to iterate over");
  35   assert(_covered.contains(mr), "Given MemRegion from " PTR_FORMAT " to " PTR_FORMAT " not contained in heap area", p2i(mr.start()), p2i(mr.end()));
  36 
  37   BitMap::idx_t const end_offset = addr_to_offset(mr.end());
  38   BitMap::idx_t offset = _bm.get_next_one_offset(addr_to_offset(mr.start()), end_offset);
  39 
  40   while (offset < end_offset) {
  41     HeapWord* const addr = offset_to_addr(offset);
  42     if (!cl->do_addr(addr)) {
  43       return false;
  44     }
  45     size_t const obj_size = (size_t)((oop)addr)->size();
  46     offset = _bm.get_next_one_offset(offset + (obj_size >> _shifter), end_offset);
  47   }
  48   return true;
  49 }
  50 
  51 inline HeapWord* G1CMBitMap::get_next_marked_addr(const HeapWord* addr,
  52                                                   const HeapWord* limit) const {
  53   assert(limit != NULL, "limit must not be NULL");
  54   // Round addr up to a possible object boundary to be safe.
  55   size_t const addr_offset = addr_to_offset(align_up(addr, HeapWordSize << _shifter));
  56   size_t const limit_offset = addr_to_offset(limit);
  57   size_t const nextOffset = _bm.get_next_one_offset(addr_offset, limit_offset);
  58   return offset_to_addr(nextOffset);
  59 }
  60 
  61 #ifdef ASSERT
  62 inline void G1CMBitMap::check_mark(HeapWord* addr) {
  63   assert(G1CollectedHeap::heap()->is_in_exact(addr),
  64          "Trying to access bitmap " PTR_FORMAT " for address " PTR_FORMAT " not in the heap.",
  65          p2i(this), p2i(addr));
  66 }
  67 #endif
  68 
  69 inline void G1CMBitMap::mark(HeapWord* addr) {
  70   check_mark(addr);
  71   _bm.set_bit(addr_to_offset(addr));
  72 }
  73 
  74 inline void G1CMBitMap::clear(HeapWord* addr) {
  75   check_mark(addr);
  76   _bm.clear_bit(addr_to_offset(addr));
  77 }
  78 
  79 inline bool G1CMBitMap::par_mark(HeapWord* addr) {
  80   check_mark(addr);
  81   return _bm.par_set_bit(addr_to_offset(addr));
  82 }
  83 
  84 #endif // SHARE_VM_GC_G1_G1CONCURRENTMARKBITMAP_INLINE_HPP