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

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#ifndef SHARE_GC_PARALLEL_PARMARKBITMAP_INLINE_HPP
#define SHARE_GC_PARALLEL_PARMARKBITMAP_INLINE_HPP

#include "gc/parallel/parMarkBitMap.hpp"

#include "utilities/align.hpp"
#include "utilities/bitMap.inline.hpp"

inline ParMarkBitMap::ParMarkBitMap():
  _heap_start(nullptr), _heap_size(0), _beg_bits(), _virtual_space(nullptr), _reserved_byte_size(0)
{ }

inline void ParMarkBitMap::clear_range(HeapWord* beg, HeapWord* end) {
  const idx_t beg_bit = addr_to_bit(beg);
  const idx_t end_bit = addr_to_bit(end);
  _beg_bits.clear_range(beg_bit, end_bit);
}

inline HeapWord* ParMarkBitMap::heap_start() const {
  return _heap_start;
}

inline HeapWord* ParMarkBitMap::heap_end() const {
  return heap_start() + heap_size();
}

inline size_t ParMarkBitMap::heap_size() const {
  return _heap_size;
}

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

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

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

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 bool ParMarkBitMap::mark_obj(HeapWord* addr) {
  return _beg_bits.par_set_bit(addr_to_bit(addr));
}

inline bool ParMarkBitMap::mark_obj(oop obj) {
  return mark_obj(cast_from_oop<HeapWord*>(obj));
}

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

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

inline ParMarkBitMap::idx_t ParMarkBitMap::align_range_end(idx_t range_end) const {
  // size is aligned, so if range_end <= size then so is aligned result.
  assert(range_end <= size(), "range end out of range");
  return align_up(range_end, BitsPerWord);
}

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 = align_range_end(end_bit);
  const idx_t res_bit = MIN2(_beg_bits.find_first_set_bit_aligned_right(beg_bit, search_end),
                             end_bit);
  return bit_to_addr(res_bit);
}

inline HeapWord* ParMarkBitMap::find_obj_beg_reverse(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 res_bit = _beg_bits.find_last_set_bit_aligned_left(beg_bit, 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 >= heap_start(),
         "addr too small, addr: " PTR_FORMAT " heap start: " PTR_FORMAT, p2i(addr), p2i(heap_start()));
  assert(addr <= heap_end(),
         "addr too big, addr: " PTR_FORMAT " heap end: " PTR_FORMAT, p2i(addr), p2i(heap_end()));
}
#endif  // #ifdef ASSERT

#endif // SHARE_GC_PARALLEL_PARMARKBITMAP_INLINE_HPP