src/hotspot/share/gc/parallel/parMarkBitMap.inline.hpp

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 *
 * 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_PARALLEL_PARMARKBITMAP_INLINE_HPP
#define SHARE_VM_GC_PARALLEL_PARMARKBITMAP_INLINE_HPP

#include "gc/parallel/parMarkBitMap.hpp"
#include "utilities/bitMap.inline.hpp"

inline ParMarkBitMap::ParMarkBitMap():
  _beg_bits(), _end_bits(), _region_start(NULL), _region_size(0), _virtual_space(NULL), _reserved_byte_size(0)
{ }

inline void ParMarkBitMap::clear_range(idx_t beg, idx_t end) {
  _beg_bits.clear_range(beg, end);
  _end_bits.clear_range(beg, end);
}

inline ParMarkBitMap::idx_t ParMarkBitMap::bits_required(size_t words) {
  // Need two bits (one begin bit, one end bit) for each unit of 'object
  // granularity' in the heap.
  return words_to_bits(words * 2);
}

inline ParMarkBitMap::idx_t ParMarkBitMap::bits_required(MemRegion covered_region) {
  return bits_required(covered_region.word_size());
}

inline HeapWord* ParMarkBitMap::region_start() const {
  return _region_start;
}

inline HeapWord* ParMarkBitMap::region_end() const {
  return region_start() + region_size();
}

inline size_t ParMarkBitMap::region_size() const {
  return _region_size;
}

inline size_t ParMarkBitMap::size() const {
  return _beg_bits.size();
}

inline bool ParMarkBitMap::is_obj_beg(idx_t bit) const {
  return _beg_bits.at(bit);
}

inline bool ParMarkBitMap::is_obj_end(idx_t bit) const {
  return _end_bits.at(bit);
}

inline bool ParMarkBitMap::is_marked(idx_t bit) const {
  return is_obj_beg(bit);
}

inline bool ParMarkBitMap::is_marked(HeapWord* addr) const {
  return is_marked(addr_to_bit(addr));
}

inline bool ParMarkBitMap::is_marked(oop obj) const {
  return is_marked((HeapWord*)obj);
}

inline bool ParMarkBitMap::is_unmarked(idx_t bit) const {
  return !is_marked(bit);
}

inline bool ParMarkBitMap::is_unmarked(HeapWord* addr) const {
  return !is_marked(addr);
}

inline bool ParMarkBitMap::is_unmarked(oop obj) const {
  return !is_marked(obj);
}

inline size_t ParMarkBitMap::bits_to_words(idx_t bits) {
  return bits << obj_granularity_shift();
}

inline ParMarkBitMap::idx_t ParMarkBitMap::words_to_bits(size_t words) {
  return words >> obj_granularity_shift();
}

inline size_t ParMarkBitMap::obj_size(idx_t beg_bit, idx_t end_bit) const {
  DEBUG_ONLY(verify_bit(beg_bit);)
  DEBUG_ONLY(verify_bit(end_bit);)
  return bits_to_words(end_bit - beg_bit + 1);
}

inline size_t ParMarkBitMap::obj_size(HeapWord* beg_addr, HeapWord* end_addr) const {
  DEBUG_ONLY(verify_addr(beg_addr);)
  DEBUG_ONLY(verify_addr(end_addr);)
  return pointer_delta(end_addr, beg_addr) + obj_granularity();
}

inline size_t ParMarkBitMap::obj_size(idx_t beg_bit) const {
  const idx_t end_bit = _end_bits.get_next_one_offset(beg_bit, size());
  assert(is_marked(beg_bit), "obj not marked");
  assert(end_bit < size(), "end bit missing");
  return obj_size(beg_bit, end_bit);
}

inline size_t ParMarkBitMap::obj_size(HeapWord* addr) const {
  return obj_size(addr_to_bit(addr));
}

inline ParMarkBitMap::IterationStatus ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure,
                                                             HeapWord* range_beg,
                                                             HeapWord* range_end) const {
  return iterate(live_closure, addr_to_bit(range_beg), addr_to_bit(range_end));
}

inline ParMarkBitMap::IterationStatus ParMarkBitMap::iterate(ParMarkBitMapClosure* live_closure,
                                                             ParMarkBitMapClosure* dead_closure,
                                                             HeapWord* range_beg,
                                                             HeapWord* range_end,
                                                             HeapWord* dead_range_end) const {
  return iterate(live_closure, dead_closure,
                 addr_to_bit(range_beg), addr_to_bit(range_end),
                 addr_to_bit(dead_range_end));
}

inline bool ParMarkBitMap::mark_obj(oop obj, int size) {
  return mark_obj((HeapWord*)obj, (size_t)size);
}

inline BitMap::idx_t ParMarkBitMap::addr_to_bit(HeapWord* addr) const {
  DEBUG_ONLY(verify_addr(addr);)
  return words_to_bits(pointer_delta(addr, region_start()));
}

inline HeapWord* ParMarkBitMap::bit_to_addr(idx_t bit) const {
  DEBUG_ONLY(verify_bit(bit);)
  return region_start() + bits_to_words(bit);
}

inline ParMarkBitMap::idx_t ParMarkBitMap::find_obj_beg(idx_t beg, idx_t end) const {
  return _beg_bits.get_next_one_offset_aligned_right(beg, end);
}

inline ParMarkBitMap::idx_t ParMarkBitMap::find_obj_end(idx_t beg, idx_t end) const {
  return _end_bits.get_next_one_offset_aligned_right(beg, end);
}

inline HeapWord* ParMarkBitMap::find_obj_beg(HeapWord* beg, HeapWord* end) const {
  const idx_t beg_bit = addr_to_bit(beg);
  const idx_t end_bit = addr_to_bit(end);
  const idx_t search_end = BitMap::word_align_up(end_bit);
  const idx_t res_bit = MIN2(find_obj_beg(beg_bit, search_end), end_bit);
  return bit_to_addr(res_bit);
}

inline HeapWord* ParMarkBitMap::find_obj_end(HeapWord* beg, HeapWord* end) const {
  const idx_t beg_bit = addr_to_bit(beg);
  const idx_t end_bit = addr_to_bit(end);
  const idx_t search_end = BitMap::word_align_up(end_bit);
  const idx_t res_bit = MIN2(find_obj_end(beg_bit, search_end), end_bit);
  return bit_to_addr(res_bit);
}

#ifdef  ASSERT
inline void ParMarkBitMap::verify_bit(idx_t bit) const {
  // Allow one past the last valid bit; useful for loop bounds.
  assert(bit <= _beg_bits.size(), "bit out of range");
}

inline void ParMarkBitMap::verify_addr(HeapWord* addr) const {
  // Allow one past the last valid address; useful for loop bounds.
  assert(addr >= region_start(),
         "addr too small, addr: " PTR_FORMAT " region start: " PTR_FORMAT, p2i(addr), p2i(region_start()));
  assert(addr <= region_end(),
         "addr too big, addr: " PTR_FORMAT " region end: " PTR_FORMAT, p2i(addr), p2i(region_end()));
}
#endif  // #ifdef ASSERT

#endif /* SHARE_VM_GC_PARALLEL_PARMARKBITMAP_INLINE_HPP */