jdk8-mips64-public/hotspot: src/share/vm/utilities/bitMap.inline.hpp@2d8a650513c2 (annotated)

src/share/vm/utilities/bitMap.inline.hpp@2d8a650513c2 (annotated)

src/share/vm/utilities/bitMap.inline.hpp

Fri, 29 Apr 2016 00:06:10 +0800

author: aoqi
date: Fri, 29 Apr 2016 00:06:10 +0800
changeset 1: 2d8a650513c2
parent 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

Added MIPS 64-bit port.

 /*
  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * 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.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_UTILITIES_BITMAP_INLINE_HPP
 #define SHARE_VM_UTILITIES_BITMAP_INLINE_HPP
 #include "runtime/atomic.hpp"
 #include "utilities/bitMap.hpp"
 #ifdef ASSERT
 inline void BitMap::verify_index(idx_t index) const {
   assert(index < _size, "BitMap index out of bounds");
 }
 inline void BitMap::verify_range(idx_t beg_index, idx_t end_index) const {
   assert(beg_index <= end_index, "BitMap range error");
   // Note that [0,0) and [size,size) are both valid ranges.
   if (end_index != _size) verify_index(end_index);
 }
 #endif // #ifdef ASSERT
 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 bm_word_t* const addr = word_addr(bit);
   const bm_word_t mask = bit_mask(bit);
   bm_word_t old_val = *addr;
   do {
     const bm_word_t new_val = old_val | mask;
     if (new_val == old_val) {
       return false;     // Someone else beat us to it.
     }
     const bm_word_t cur_val = (bm_word_t) Atomic::cmpxchg_ptr((void*) new_val,
                                                       (volatile void*) addr,
                                                       (void*) old_val);
     if (cur_val == old_val) {
       return true;      // Success.
     }
     old_val = cur_val;  // The value changed, try again.
   } while (true);
 }
 inline bool BitMap::par_clear_bit(idx_t bit) {
   verify_index(bit);
   volatile bm_word_t* const addr = word_addr(bit);
   const bm_word_t mask = ~bit_mask(bit);
   bm_word_t old_val = *addr;
   do {
     const bm_word_t new_val = old_val & mask;
     if (new_val == old_val) {
       return false;     // Someone else beat us to it.
     }
     const bm_word_t cur_val = (bm_word_t) Atomic::cmpxchg_ptr((void*) new_val,
                                                       (volatile void*) addr,
                                                       (void*) old_val);
     if (cur_val == old_val) {
       return true;      // Success.
     }
     old_val = cur_val;  // The value changed, try again.
   } while (true);
 }
 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);
     }
   }
 }
 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());
 }
 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 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_offset++) {
       res = res >> 1;
     }
 #ifdef ASSERT
     // In the following assert, if r_offset is not bitamp word aligned,
     // checking that res_offset is strictly less than r_offset is too
     // strong and will trip the assert.
     //
     // Consider the case where l_offset is bit 15 and r_offset is bit 17
     // of the same map word, and where bits [15:16:17:18] == [00:00:00:01].
     // All the bits in the range [l_offset:r_offset) are 0.
     // The loop that calculates res_offset, above, would yield the offset
     // of bit 18 because it's in the same map word as l_offset and there
     // is a set bit in that map word above l_offset (i.e. res != NoBits).
     //
     // In this case, however, we can assert is that res_offset is strictly
     // less than size() since we know that there is at least one set bit
     // at an offset above, but in the same map word as, r_offset.
     // Otherwise, if r_offset is word aligned then it will not be in the
     // same map word as l_offset (unless it equals l_offset). So either
     // there won't be a set bit between l_offset and the end of it's map
     // word (i.e. res == NoBits), or res_offset will be less than r_offset.
     idx_t limit = is_word_aligned(r_offset) ? r_offset : size();
     assert(res_offset >= l_offset && res_offset < limit, "just checking");
 #endif // ASSERT
     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) {
       // 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, "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 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();
 }
 #endif // SHARE_VM_UTILITIES_BITMAP_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/utilities/bitMap.inline.hpp@2d8a650513c2 (annotated)

src/share/vm/utilities/bitMap.inline.hpp