aoqi@0: /*
aoqi@0:  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_UTILITIES_BITMAP_INLINE_HPP
aoqi@0: #define SHARE_VM_UTILITIES_BITMAP_INLINE_HPP
aoqi@0: 
aoqi@0: #include "runtime/atomic.hpp"
aoqi@0: #include "utilities/bitMap.hpp"
aoqi@0: 
aoqi@0: #ifdef ASSERT
aoqi@0: inline void BitMap::verify_index(idx_t index) const {
aoqi@0:   assert(index < _size, "BitMap index out of bounds");
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap::verify_range(idx_t beg_index, idx_t end_index) const {
aoqi@0:   assert(beg_index <= end_index, "BitMap range error");
aoqi@0:   // Note that [0,0) and [size,size) are both valid ranges.
aoqi@0:   if (end_index != _size) verify_index(end_index);
aoqi@0: }
aoqi@0: #endif // #ifdef ASSERT
aoqi@0: 
aoqi@0: inline void BitMap::set_bit(idx_t bit) {
aoqi@0:   verify_index(bit);
aoqi@0:   *word_addr(bit) |= bit_mask(bit);
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap::clear_bit(idx_t bit) {
aoqi@0:   verify_index(bit);
aoqi@0:   *word_addr(bit) &= ~bit_mask(bit);
aoqi@0: }
aoqi@0: 
aoqi@0: inline bool BitMap::par_set_bit(idx_t bit) {
aoqi@0:   verify_index(bit);
aoqi@0:   volatile bm_word_t* const addr = word_addr(bit);
aoqi@0:   const bm_word_t mask = bit_mask(bit);
aoqi@0:   bm_word_t old_val = *addr;
aoqi@0: 
aoqi@0:   do {
aoqi@0:     const bm_word_t new_val = old_val | mask;
aoqi@0:     if (new_val == old_val) {
aoqi@0:       return false;     // Someone else beat us to it.
aoqi@0:     }
aoqi@0:     const bm_word_t cur_val = (bm_word_t) Atomic::cmpxchg_ptr((void*) new_val,
aoqi@0:                                                       (volatile void*) addr,
aoqi@0:                                                       (void*) old_val);
aoqi@0:     if (cur_val == old_val) {
aoqi@0:       return true;      // Success.
aoqi@0:     }
aoqi@0:     old_val = cur_val;  // The value changed, try again.
aoqi@0:   } while (true);
aoqi@0: }
aoqi@0: 
aoqi@0: inline bool BitMap::par_clear_bit(idx_t bit) {
aoqi@0:   verify_index(bit);
aoqi@0:   volatile bm_word_t* const addr = word_addr(bit);
aoqi@0:   const bm_word_t mask = ~bit_mask(bit);
aoqi@0:   bm_word_t old_val = *addr;
aoqi@0: 
aoqi@0:   do {
aoqi@0:     const bm_word_t new_val = old_val & mask;
aoqi@0:     if (new_val == old_val) {
aoqi@0:       return false;     // Someone else beat us to it.
aoqi@0:     }
aoqi@0:     const bm_word_t cur_val = (bm_word_t) Atomic::cmpxchg_ptr((void*) new_val,
aoqi@0:                                                       (volatile void*) addr,
aoqi@0:                                                       (void*) old_val);
aoqi@0:     if (cur_val == old_val) {
aoqi@0:       return true;      // Success.
aoqi@0:     }
aoqi@0:     old_val = cur_val;  // The value changed, try again.
aoqi@0:   } while (true);
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap::set_range(idx_t beg, idx_t end, RangeSizeHint hint) {
aoqi@0:   if (hint == small_range && end - beg == 1) {
aoqi@0:     set_bit(beg);
aoqi@0:   } else {
aoqi@0:     if (hint == large_range) {
aoqi@0:       set_large_range(beg, end);
aoqi@0:     } else {
aoqi@0:       set_range(beg, end);
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap::clear_range(idx_t beg, idx_t end, RangeSizeHint hint) {
aoqi@0:   if (hint == small_range && end - beg == 1) {
aoqi@0:     clear_bit(beg);
aoqi@0:   } else {
aoqi@0:     if (hint == large_range) {
aoqi@0:       clear_large_range(beg, end);
aoqi@0:     } else {
aoqi@0:       clear_range(beg, end);
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap::par_set_range(idx_t beg, idx_t end, RangeSizeHint hint) {
aoqi@0:   if (hint == small_range && end - beg == 1) {
aoqi@0:     par_at_put(beg, true);
aoqi@0:   } else {
aoqi@0:     if (hint == large_range) {
aoqi@0:       par_at_put_large_range(beg, end, true);
aoqi@0:     } else {
aoqi@0:       par_at_put_range(beg, end, true);
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap::set_range_of_words(idx_t beg, idx_t end) {
aoqi@0:   bm_word_t* map = _map;
aoqi@0:   for (idx_t i = beg; i < end; ++i) map[i] = ~(uintptr_t)0;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: inline void BitMap::clear_range_of_words(idx_t beg, idx_t end) {
aoqi@0:   bm_word_t* map = _map;
aoqi@0:   for (idx_t i = beg; i < end; ++i) map[i] = 0;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: inline void BitMap::clear() {
aoqi@0:   clear_range_of_words(0, size_in_words());
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: inline void BitMap::par_clear_range(idx_t beg, idx_t end, RangeSizeHint hint) {
aoqi@0:   if (hint == small_range && end - beg == 1) {
aoqi@0:     par_at_put(beg, false);
aoqi@0:   } else {
aoqi@0:     if (hint == large_range) {
aoqi@0:       par_at_put_large_range(beg, end, false);
aoqi@0:     } else {
aoqi@0:       par_at_put_range(beg, end, false);
aoqi@0:     }
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: inline BitMap::idx_t
aoqi@0: BitMap::get_next_one_offset_inline(idx_t l_offset, idx_t r_offset) const {
aoqi@0:   assert(l_offset <= size(), "BitMap index out of bounds");
aoqi@0:   assert(r_offset <= size(), "BitMap index out of bounds");
aoqi@0:   assert(l_offset <= r_offset, "l_offset > r_offset ?");
aoqi@0: 
aoqi@0:   if (l_offset == r_offset) {
aoqi@0:     return l_offset;
aoqi@0:   }
aoqi@0:   idx_t   index = word_index(l_offset);
aoqi@0:   idx_t r_index = word_index(r_offset-1) + 1;
aoqi@0:   idx_t res_offset = l_offset;
aoqi@0: 
aoqi@0:   // check bits including and to the _left_ of offset's position
aoqi@0:   idx_t pos = bit_in_word(res_offset);
aoqi@0:   idx_t res = map(index) >> pos;
aoqi@0:   if (res != (uintptr_t)NoBits) {
aoqi@0:     // find the position of the 1-bit
aoqi@0:     for (; !(res & 1); res_offset++) {
aoqi@0:       res = res >> 1;
aoqi@0:     }
aoqi@0: 
aoqi@0: #ifdef ASSERT
aoqi@0:     // In the following assert, if r_offset is not bitamp word aligned,
aoqi@0:     // checking that res_offset is strictly less than r_offset is too
aoqi@0:     // strong and will trip the assert.
aoqi@0:     //
aoqi@0:     // Consider the case where l_offset is bit 15 and r_offset is bit 17
aoqi@0:     // of the same map word, and where bits [15:16:17:18] == [00:00:00:01].
aoqi@0:     // All the bits in the range [l_offset:r_offset) are 0.
aoqi@0:     // The loop that calculates res_offset, above, would yield the offset
aoqi@0:     // of bit 18 because it's in the same map word as l_offset and there
aoqi@0:     // is a set bit in that map word above l_offset (i.e. res != NoBits).
aoqi@0:     //
aoqi@0:     // In this case, however, we can assert is that res_offset is strictly
aoqi@0:     // less than size() since we know that there is at least one set bit
aoqi@0:     // at an offset above, but in the same map word as, r_offset.
aoqi@0:     // Otherwise, if r_offset is word aligned then it will not be in the
aoqi@0:     // same map word as l_offset (unless it equals l_offset). So either
aoqi@0:     // there won't be a set bit between l_offset and the end of it's map
aoqi@0:     // word (i.e. res == NoBits), or res_offset will be less than r_offset.
aoqi@0: 
aoqi@0:     idx_t limit = is_word_aligned(r_offset) ? r_offset : size();
aoqi@0:     assert(res_offset >= l_offset && res_offset < limit, "just checking");
aoqi@0: #endif // ASSERT
aoqi@0:     return MIN2(res_offset, r_offset);
aoqi@0:   }
aoqi@0:   // skip over all word length 0-bit runs
aoqi@0:   for (index++; index < r_index; index++) {
aoqi@0:     res = map(index);
aoqi@0:     if (res != (uintptr_t)NoBits) {
aoqi@0:       // found a 1, return the offset
aoqi@0:       for (res_offset = bit_index(index); !(res & 1); res_offset++) {
aoqi@0:         res = res >> 1;
aoqi@0:       }
aoqi@0:       assert(res & 1, "tautology; see loop condition");
aoqi@0:       assert(res_offset >= l_offset, "just checking");
aoqi@0:       return MIN2(res_offset, r_offset);
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return r_offset;
aoqi@0: }
aoqi@0: 
aoqi@0: inline BitMap::idx_t
aoqi@0: BitMap::get_next_zero_offset_inline(idx_t l_offset, idx_t r_offset) const {
aoqi@0:   assert(l_offset <= size(), "BitMap index out of bounds");
aoqi@0:   assert(r_offset <= size(), "BitMap index out of bounds");
aoqi@0:   assert(l_offset <= r_offset, "l_offset > r_offset ?");
aoqi@0: 
aoqi@0:   if (l_offset == r_offset) {
aoqi@0:     return l_offset;
aoqi@0:   }
aoqi@0:   idx_t   index = word_index(l_offset);
aoqi@0:   idx_t r_index = word_index(r_offset-1) + 1;
aoqi@0:   idx_t res_offset = l_offset;
aoqi@0: 
aoqi@0:   // check bits including and to the _left_ of offset's position
aoqi@0:   idx_t pos = res_offset & (BitsPerWord - 1);
aoqi@0:   idx_t res = (map(index) >> pos) | left_n_bits((int)pos);
aoqi@0: 
aoqi@0:   if (res != (uintptr_t)AllBits) {
aoqi@0:     // find the position of the 0-bit
aoqi@0:     for (; res & 1; res_offset++) {
aoqi@0:       res = res >> 1;
aoqi@0:     }
aoqi@0:     assert(res_offset >= l_offset, "just checking");
aoqi@0:     return MIN2(res_offset, r_offset);
aoqi@0:   }
aoqi@0:   // skip over all word length 1-bit runs
aoqi@0:   for (index++; index < r_index; index++) {
aoqi@0:     res = map(index);
aoqi@0:     if (res != (uintptr_t)AllBits) {
aoqi@0:       // found a 0, return the offset
aoqi@0:       for (res_offset = index << LogBitsPerWord; res & 1;
aoqi@0:            res_offset++) {
aoqi@0:         res = res >> 1;
aoqi@0:       }
aoqi@0:       assert(!(res & 1), "tautology; see loop condition");
aoqi@0:       assert(res_offset >= l_offset, "just checking");
aoqi@0:       return MIN2(res_offset, r_offset);
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return r_offset;
aoqi@0: }
aoqi@0: 
aoqi@0: inline BitMap::idx_t
aoqi@0: BitMap::get_next_one_offset_inline_aligned_right(idx_t l_offset,
aoqi@0:                                                  idx_t r_offset) const
aoqi@0: {
aoqi@0:   verify_range(l_offset, r_offset);
aoqi@0:   assert(bit_in_word(r_offset) == 0, "r_offset not word-aligned");
aoqi@0: 
aoqi@0:   if (l_offset == r_offset) {
aoqi@0:     return l_offset;
aoqi@0:   }
aoqi@0:   idx_t   index = word_index(l_offset);
aoqi@0:   idx_t r_index = word_index(r_offset);
aoqi@0:   idx_t res_offset = l_offset;
aoqi@0: 
aoqi@0:   // check bits including and to the _left_ of offset's position
aoqi@0:   idx_t res = map(index) >> bit_in_word(res_offset);
aoqi@0:   if (res != (uintptr_t)NoBits) {
aoqi@0:     // find the position of the 1-bit
aoqi@0:     for (; !(res & 1); res_offset++) {
aoqi@0:       res = res >> 1;
aoqi@0:     }
aoqi@0:     assert(res_offset >= l_offset &&
aoqi@0:            res_offset < r_offset, "just checking");
aoqi@0:     return res_offset;
aoqi@0:   }
aoqi@0:   // skip over all word length 0-bit runs
aoqi@0:   for (index++; index < r_index; index++) {
aoqi@0:     res = map(index);
aoqi@0:     if (res != (uintptr_t)NoBits) {
aoqi@0:       // found a 1, return the offset
aoqi@0:       for (res_offset = bit_index(index); !(res & 1); res_offset++) {
aoqi@0:         res = res >> 1;
aoqi@0:       }
aoqi@0:       assert(res & 1, "tautology; see loop condition");
aoqi@0:       assert(res_offset >= l_offset && res_offset < r_offset, "just checking");
aoqi@0:       return res_offset;
aoqi@0:     }
aoqi@0:   }
aoqi@0:   return r_offset;
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: // Returns a bit mask for a range of bits [beg, end) within a single word.  Each
aoqi@0: // bit in the mask is 0 if the bit is in the range, 1 if not in the range.  The
aoqi@0: // returned mask can be used directly to clear the range, or inverted to set the
aoqi@0: // range.  Note:  end must not be 0.
aoqi@0: inline BitMap::bm_word_t
aoqi@0: BitMap::inverted_bit_mask_for_range(idx_t beg, idx_t end) const {
aoqi@0:   assert(end != 0, "does not work when end == 0");
aoqi@0:   assert(beg == end || word_index(beg) == word_index(end - 1),
aoqi@0:          "must be a single-word range");
aoqi@0:   bm_word_t mask = bit_mask(beg) - 1;   // low (right) bits
aoqi@0:   if (bit_in_word(end) != 0) {
aoqi@0:     mask |= ~(bit_mask(end) - 1);       // high (left) bits
aoqi@0:   }
aoqi@0:   return mask;
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap::set_large_range_of_words(idx_t beg, idx_t end) {
aoqi@0:   memset(_map + beg, ~(unsigned char)0, (end - beg) * sizeof(uintptr_t));
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap::clear_large_range_of_words(idx_t beg, idx_t end) {
aoqi@0:   memset(_map + beg, 0, (end - beg) * sizeof(uintptr_t));
aoqi@0: }
aoqi@0: 
aoqi@0: inline BitMap::idx_t BitMap::word_index_round_up(idx_t bit) const {
aoqi@0:   idx_t bit_rounded_up = bit + (BitsPerWord - 1);
aoqi@0:   // Check for integer arithmetic overflow.
aoqi@0:   return bit_rounded_up > bit ? word_index(bit_rounded_up) : size_in_words();
aoqi@0: }
aoqi@0: 
aoqi@0: inline BitMap::idx_t BitMap::get_next_one_offset(idx_t l_offset,
aoqi@0:                                           idx_t r_offset) const {
aoqi@0:   return get_next_one_offset_inline(l_offset, r_offset);
aoqi@0: }
aoqi@0: 
aoqi@0: inline BitMap::idx_t BitMap::get_next_zero_offset(idx_t l_offset,
aoqi@0:                                            idx_t r_offset) const {
aoqi@0:   return get_next_zero_offset_inline(l_offset, r_offset);
aoqi@0: }
aoqi@0: 
aoqi@0: inline void BitMap2D::clear() {
aoqi@0:   _map.clear();
aoqi@0: }
aoqi@0: 
aoqi@0: #endif // SHARE_VM_UTILITIES_BITMAP_INLINE_HPP