--- a/hotspot/src/share/vm/utilities/bitMap.inline.hpp Wed Jun 04 13:51:09 2008 -0700
+++ b/hotspot/src/share/vm/utilities/bitMap.inline.hpp Thu Jun 05 15:57:56 2008 -0700
@@ -22,6 +22,17 @@
*
*/
+
+inline void BitMap::set_bit(idx_t bit) {
+ verify_index(bit);
+ *word_addr(bit) |= bit_mask(bit);
+}
+
+inline void BitMap::clear_bit(idx_t bit) {
+ verify_index(bit);
+ *word_addr(bit) &= ~bit_mask(bit);
+}
+
inline bool BitMap::par_set_bit(idx_t bit) {
verify_index(bit);
volatile idx_t* const addr = word_addr(bit);
@@ -64,42 +75,236 @@
} while (true);
}
-inline BitMap::idx_t
-BitMap::find_next_one_bit(idx_t beg_bit, idx_t end_bit) const
-{
- verify_range(beg_bit, end_bit);
- assert(bit_in_word(end_bit) == 0, "end_bit not word-aligned");
+inline void BitMap::set_range(idx_t beg, idx_t end, RangeSizeHint hint) {
+ if (hint == small_range && end - beg == 1) {
+ set_bit(beg);
+ } else {
+ if (hint == large_range) {
+ set_large_range(beg, end);
+ } else {
+ set_range(beg, end);
+ }
+ }
+}
+
+inline void BitMap::clear_range(idx_t beg, idx_t end, RangeSizeHint hint) {
+ if (hint == small_range && end - beg == 1) {
+ clear_bit(beg);
+ } else {
+ if (hint == large_range) {
+ clear_large_range(beg, end);
+ } else {
+ clear_range(beg, end);
+ }
+ }
+}
+
+inline void BitMap::par_set_range(idx_t beg, idx_t end, RangeSizeHint hint) {
+ if (hint == small_range && end - beg == 1) {
+ par_at_put(beg, true);
+ } else {
+ if (hint == large_range) {
+ par_at_put_large_range(beg, end, true);
+ } else {
+ par_at_put_range(beg, end, true);
+ }
+ }
+}
- if (beg_bit == end_bit) {
- return beg_bit;
- }
+inline void BitMap::set_range_of_words(idx_t beg, idx_t end) {
+ bm_word_t* map = _map;
+ for (idx_t i = beg; i < end; ++i) map[i] = ~(uintptr_t)0;
+}
+
+
+inline void BitMap::clear_range_of_words(idx_t beg, idx_t end) {
+ bm_word_t* map = _map;
+ for (idx_t i = beg; i < end; ++i) map[i] = 0;
+}
+
+
+inline void BitMap::clear() {
+ clear_range_of_words(0, size_in_words());
+}
+
- idx_t index = word_index(beg_bit);
- idx_t r_index = word_index(end_bit);
- idx_t res_bit = beg_bit;
+inline void BitMap::par_clear_range(idx_t beg, idx_t end, RangeSizeHint hint) {
+ if (hint == small_range && end - beg == 1) {
+ par_at_put(beg, false);
+ } else {
+ if (hint == large_range) {
+ par_at_put_large_range(beg, end, false);
+ } else {
+ par_at_put_range(beg, end, false);
+ }
+ }
+}
+
+inline BitMap::idx_t
+BitMap::get_next_one_offset_inline(idx_t l_offset, idx_t r_offset) const {
+ assert(l_offset <= size(), "BitMap index out of bounds");
+ assert(r_offset <= size(), "BitMap index out of bounds");
+ assert(l_offset <= r_offset, "l_offset > r_offset ?");
+
+ if (l_offset == r_offset) {
+ return l_offset;
+ }
+ idx_t index = word_index(l_offset);
+ idx_t r_index = word_index(r_offset-1) + 1;
+ idx_t res_offset = l_offset;
// check bits including and to the _left_ of offset's position
- idx_t res = map(index) >> bit_in_word(res_bit);
- if (res != (uintptr_t) NoBits) {
+ idx_t pos = bit_in_word(res_offset);
+ idx_t res = map(index) >> pos;
+ if (res != (uintptr_t)NoBits) {
// find the position of the 1-bit
- for (; !(res & 1); res_bit++) {
+ for (; !(res & 1); res_offset++) {
res = res >> 1;
}
- assert(res_bit >= beg_bit && res_bit < end_bit, "just checking");
- return res_bit;
+ assert(res_offset >= l_offset &&
+ res_offset < r_offset, "just checking");
+ return MIN2(res_offset, r_offset);
}
// skip over all word length 0-bit runs
for (index++; index < r_index; index++) {
res = map(index);
- if (res != (uintptr_t) NoBits) {
+ if (res != (uintptr_t)NoBits) {
// found a 1, return the offset
- for (res_bit = bit_index(index); !(res & 1); res_bit++) {
+ for (res_offset = bit_index(index); !(res & 1); res_offset++) {
res = res >> 1;
}
assert(res & 1, "tautology; see loop condition");
- assert(res_bit >= beg_bit && res_bit < end_bit, "just checking");
- return res_bit;
+ assert(res_offset >= l_offset, "just checking");
+ return MIN2(res_offset, r_offset);
+ }
+ }
+ return r_offset;
+}
+
+inline BitMap::idx_t
+BitMap::get_next_zero_offset_inline(idx_t l_offset, idx_t r_offset) const {
+ assert(l_offset <= size(), "BitMap index out of bounds");
+ assert(r_offset <= size(), "BitMap index out of bounds");
+ assert(l_offset <= r_offset, "l_offset > r_offset ?");
+
+ if (l_offset == r_offset) {
+ return l_offset;
+ }
+ idx_t index = word_index(l_offset);
+ idx_t r_index = word_index(r_offset-1) + 1;
+ idx_t res_offset = l_offset;
+
+ // check bits including and to the _left_ of offset's position
+ idx_t pos = res_offset & (BitsPerWord - 1);
+ idx_t res = (map(index) >> pos) | left_n_bits((int)pos);
+
+ if (res != (uintptr_t)AllBits) {
+ // find the position of the 0-bit
+ for (; res & 1; res_offset++) {
+ res = res >> 1;
+ }
+ assert(res_offset >= l_offset, "just checking");
+ return MIN2(res_offset, r_offset);
+ }
+ // skip over all word length 1-bit runs
+ for (index++; index < r_index; index++) {
+ res = map(index);
+ if (res != (uintptr_t)AllBits) {
+ // found a 0, return the offset
+ for (res_offset = index << LogBitsPerWord; res & 1;
+ res_offset++) {
+ res = res >> 1;
+ }
+ assert(!(res & 1), "tautology; see loop condition");
+ assert(res_offset >= l_offset, "just checking");
+ return MIN2(res_offset, r_offset);
}
}
- return end_bit;
+ return r_offset;
+}
+
+inline BitMap::idx_t
+BitMap::get_next_one_offset_inline_aligned_right(idx_t l_offset,
+ idx_t r_offset) const
+{
+ verify_range(l_offset, r_offset);
+ assert(bit_in_word(r_offset) == 0, "r_offset not word-aligned");
+
+ if (l_offset == r_offset) {
+ return l_offset;
+ }
+ idx_t index = word_index(l_offset);
+ idx_t r_index = word_index(r_offset);
+ idx_t res_offset = l_offset;
+
+ // check bits including and to the _left_ of offset's position
+ idx_t res = map(index) >> bit_in_word(res_offset);
+ if (res != (uintptr_t)NoBits) {
+ // find the position of the 1-bit
+ for (; !(res & 1); res_offset++) {
+ res = res >> 1;
+ }
+ assert(res_offset >= l_offset &&
+ res_offset < r_offset, "just checking");
+ return res_offset;
+ }
+ // skip over all word length 0-bit runs
+ for (index++; index < r_index; index++) {
+ res = map(index);
+ if (res != (uintptr_t)NoBits) {
+ // found a 1, return the offset
+ for (res_offset = bit_index(index); !(res & 1); res_offset++) {
+ res = res >> 1;
+ }
+ assert(res & 1, "tautology; see loop condition");
+ assert(res_offset >= l_offset && res_offset < r_offset, "just checking");
+ return res_offset;
+ }
+ }
+ return r_offset;
}
+
+
+// Returns a bit mask for a range of bits [beg, end) within a single word. Each
+// bit in the mask is 0 if the bit is in the range, 1 if not in the range. The
+// returned mask can be used directly to clear the range, or inverted to set the
+// range. Note: end must not be 0.
+inline BitMap::bm_word_t
+BitMap::inverted_bit_mask_for_range(idx_t beg, idx_t end) const {
+ assert(end != 0, "does not work when end == 0");
+ assert(beg == end || word_index(beg) == word_index(end - 1),
+ "must be a single-word range");
+ bm_word_t mask = bit_mask(beg) - 1; // low (right) bits
+ if (bit_in_word(end) != 0) {
+ mask |= ~(bit_mask(end) - 1); // high (left) bits
+ }
+ return mask;
+}
+
+inline void BitMap::set_large_range_of_words(idx_t beg, idx_t end) {
+ memset(_map + beg, ~(unsigned char)0, (end - beg) * sizeof(uintptr_t));
+}
+
+inline void BitMap::clear_large_range_of_words(idx_t beg, idx_t end) {
+ memset(_map + beg, 0, (end - beg) * sizeof(uintptr_t));
+}
+
+inline BitMap::idx_t BitMap::word_index_round_up(idx_t bit) const {
+ idx_t bit_rounded_up = bit + (BitsPerWord - 1);
+ // Check for integer arithmetic overflow.
+ return bit_rounded_up > bit ? word_index(bit_rounded_up) : size_in_words();
+}
+
+inline BitMap::idx_t BitMap::get_next_one_offset(idx_t l_offset,
+ idx_t r_offset) const {
+ return get_next_one_offset_inline(l_offset, r_offset);
+}
+
+inline BitMap::idx_t BitMap::get_next_zero_offset(idx_t l_offset,
+ idx_t r_offset) const {
+ return get_next_zero_offset_inline(l_offset, r_offset);
+}
+
+inline void BitMap2D::clear() {
+ _map.clear();
+}