jdk8-mips64-public/hotspot: comparison src/share/vm/utilities/bitMap.hpp

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+/*
+* Copyright (c) 1997, 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_HPP
+#define SHARE_VM_UTILITIES_BITMAP_HPP
+#include "memory/allocation.hpp"
+#include "utilities/top.hpp"
+// Forward decl;
+class BitMapClosure;
+// Operations for bitmaps represented as arrays of unsigned integers.
+// Bit offsets are numbered from 0 to size-1.
+class BitMap VALUE_OBJ_CLASS_SPEC {
+friend class BitMap2D;
+public:
+typedef size_t idx_t;         // Type used for bit and word indices.
+typedef uintptr_t bm_word_t;  // Element type of array that represents
+// the bitmap.
+// Hints for range sizes.
+typedef enum {
+unknown_range, small_range, large_range
+} RangeSizeHint;
+private:
+ArrayAllocator<bm_word_t, mtInternal> _map_allocator;
+bm_word_t* _map;     // First word in bitmap
+idx_t      _size;    // Size of bitmap (in bits)
+// Puts the given value at the given offset, using resize() to size
+// the bitmap appropriately if needed using factor-of-two expansion.
+void at_put_grow(idx_t index, bool value);
+protected:
+// Return the position of bit within the word that contains it (e.g., if
+// bitmap words are 32 bits, return a number 0 <= n <= 31).
+static idx_t bit_in_word(idx_t bit) { return bit & (BitsPerWord - 1); }
+// Return a mask that will select the specified bit, when applied to the word
+// containing the bit.
+static bm_word_t bit_mask(idx_t bit) { return (bm_word_t)1 << bit_in_word(bit); }
+// Return the index of the word containing the specified bit.
+static idx_t word_index(idx_t bit)  { return bit >> LogBitsPerWord; }
+// Return the bit number of the first bit in the specified word.
+static idx_t bit_index(idx_t word)  { return word << LogBitsPerWord; }
+// Return the array of bitmap words, or a specific word from it.
+bm_word_t* map() const           { return _map; }
+bm_word_t  map(idx_t word) const { return _map[word]; }
+// Return a pointer to the word containing the specified bit.
+bm_word_t* word_addr(idx_t bit) const { return map() + word_index(bit); }
+// Set a word to a specified value or to all ones; clear a word.
+void set_word  (idx_t word, bm_word_t val) { _map[word] = val; }
+void set_word  (idx_t word)            { set_word(word, ~(uintptr_t)0); }
+void clear_word(idx_t word)            { _map[word] = 0; }
+// Utilities for ranges of bits.  Ranges are half-open [beg, end).
+// Ranges within a single word.
+bm_word_t inverted_bit_mask_for_range(idx_t beg, idx_t end) const;
+void  set_range_within_word      (idx_t beg, idx_t end);
+void  clear_range_within_word    (idx_t beg, idx_t end);
+void  par_put_range_within_word  (idx_t beg, idx_t end, bool value);
+// Ranges spanning entire words.
+void      set_range_of_words         (idx_t beg, idx_t end);
+void      clear_range_of_words       (idx_t beg, idx_t end);
+void      set_large_range_of_words   (idx_t beg, idx_t end);
+void      clear_large_range_of_words (idx_t beg, idx_t end);
+// The index of the first full word in a range.
+idx_t word_index_round_up(idx_t bit) const;
+// Verification.
+inline void verify_index(idx_t index) const NOT_DEBUG_RETURN;
+inline void verify_range(idx_t beg_index, idx_t end_index) const
+NOT_DEBUG_RETURN;
+// Statistics.
+static idx_t* _pop_count_table;
+static void init_pop_count_table();
+static idx_t num_set_bits(bm_word_t w);
+static idx_t num_set_bits_from_table(unsigned char c);
+public:
+// Constructs a bitmap with no map, and size 0.
+BitMap() : _map(NULL), _size(0), _map_allocator(false) {}
+// Constructs a bitmap with the given map and size.
+BitMap(bm_word_t* map, idx_t size_in_bits);
+// Constructs an empty bitmap of the given size (that is, this clears the
+// new bitmap).  Allocates the map array in resource area if
+// "in_resource_area" is true, else in the C heap.
+BitMap(idx_t size_in_bits, bool in_resource_area = true);
+// Set the map and size.
+void set_map(bm_word_t* map)      { _map = map; }
+void set_size(idx_t size_in_bits) { _size = size_in_bits; }
+// Allocates necessary data structure, either in the resource area
+// or in the C heap, as indicated by "in_resource_area."
+// Preserves state currently in bit map by copying data.
+// Zeros any newly-addressable bits.
+// If "in_resource_area" is false, frees the current map.
+// (Note that this assumes that all calls to "resize" on the same BitMap
+// use the same value for "in_resource_area".)
+void resize(idx_t size_in_bits, bool in_resource_area = true);
+// Accessing
+idx_t size() const                    { return _size; }
+idx_t size_in_words() const           {
+return word_index(size() + BitsPerWord - 1);
+}
+bool at(idx_t index) const {
+verify_index(index);
+return (*word_addr(index) & bit_mask(index)) != 0;
+}
+// Align bit index up or down to the next bitmap word boundary, or check
+// alignment.
+static idx_t word_align_up(idx_t bit) {
+return align_size_up(bit, BitsPerWord);
+}
+static idx_t word_align_down(idx_t bit) {
+return align_size_down(bit, BitsPerWord);
+}
+static bool is_word_aligned(idx_t bit) {
+return word_align_up(bit) == bit;
+}
+// Set or clear the specified bit.
+inline void set_bit(idx_t bit);
+inline void clear_bit(idx_t bit);
+// Atomically set or clear the specified bit.
+inline bool par_set_bit(idx_t bit);
+inline bool par_clear_bit(idx_t bit);
+// Put the given value at the given offset. The parallel version
+// will CAS the value into the bitmap and is quite a bit slower.
+// The parallel version also returns a value indicating if the
+// calling thread was the one that changed the value of the bit.
+void at_put(idx_t index, bool value);
+bool par_at_put(idx_t index, bool value);
+// Update a range of bits.  Ranges are half-open [beg, end).
+void set_range   (idx_t beg, idx_t end);
+void clear_range (idx_t beg, idx_t end);
+void set_large_range   (idx_t beg, idx_t end);
+void clear_large_range (idx_t beg, idx_t end);
+void at_put_range(idx_t beg, idx_t end, bool value);
+void par_at_put_range(idx_t beg, idx_t end, bool value);
+void at_put_large_range(idx_t beg, idx_t end, bool value);
+void par_at_put_large_range(idx_t beg, idx_t end, bool value);
+// Update a range of bits, using a hint about the size.  Currently only
+// inlines the predominant case of a 1-bit range.  Works best when hint is a
+// compile-time constant.
+void set_range(idx_t beg, idx_t end, RangeSizeHint hint);
+void clear_range(idx_t beg, idx_t end, RangeSizeHint hint);
+void par_set_range(idx_t beg, idx_t end, RangeSizeHint hint);
+void par_clear_range  (idx_t beg, idx_t end, RangeSizeHint hint);
+// Clearing
+void clear_large();
+inline void clear();
+// Iteration support.  Returns "true" if the iteration completed, false
+// if the iteration terminated early (because the closure "blk" returned
+// false).
+bool iterate(BitMapClosure* blk, idx_t leftIndex, idx_t rightIndex);
+bool iterate(BitMapClosure* blk) {
+// call the version that takes an interval
+return iterate(blk, 0, size());
+}
+// Looking for 1's and 0's at indices equal to or greater than "l_index",
+// stopping if none has been found before "r_index", and returning
+// "r_index" (which must be at most "size") in that case.
+idx_t get_next_one_offset_inline (idx_t l_index, idx_t r_index) const;
+idx_t get_next_zero_offset_inline(idx_t l_index, idx_t r_index) const;
+// Like "get_next_one_offset_inline", except requires that "r_index" is
+// aligned to bitsizeof(bm_word_t).
+idx_t get_next_one_offset_inline_aligned_right(idx_t l_index,
+idx_t r_index) const;
+// Non-inline versionsof the above.
+idx_t get_next_one_offset (idx_t l_index, idx_t r_index) const;
+idx_t get_next_zero_offset(idx_t l_index, idx_t r_index) const;
+idx_t get_next_one_offset(idx_t offset) const {
+return get_next_one_offset(offset, size());
+}
+idx_t get_next_zero_offset(idx_t offset) const {
+return get_next_zero_offset(offset, size());
+}
+// Returns the number of bits set in the bitmap.
+idx_t count_one_bits() const;
+// Set operations.
+void set_union(BitMap bits);
+void set_difference(BitMap bits);
+void set_intersection(BitMap bits);
+// Returns true iff "this" is a superset of "bits".
+bool contains(const BitMap bits) const;
+// Returns true iff "this and "bits" have a non-empty intersection.
+bool intersects(const BitMap bits) const;
+// Returns result of whether this map changed
+// during the operation
+bool set_union_with_result(BitMap bits);
+bool set_difference_with_result(BitMap bits);
+bool set_intersection_with_result(BitMap bits);
+// Requires the submap of "bits" starting at offset to be at least as
+// large as "this".  Modifies "this" to be the intersection of its
+// current contents and the submap of "bits" starting at "offset" of the
+// same length as "this."
+// (For expedience, currently requires the offset to be aligned to the
+// bitsize of a uintptr_t.  This should go away in the future though it
+// will probably remain a good case to optimize.)
+void set_intersection_at_offset(BitMap bits, idx_t offset);
+void set_from(BitMap bits);
+bool is_same(BitMap bits);
+// Test if all bits are set or cleared
+bool is_full() const;
+bool is_empty() const;
+void print_on_error(outputStream* st, const char* prefix) const;
+#ifndef PRODUCT
+public:
+// Printing
+void print_on(outputStream* st) const;
+#endif
+};
+// Convenience class wrapping BitMap which provides multiple bits per slot.
+class BitMap2D VALUE_OBJ_CLASS_SPEC {
+public:
+typedef BitMap::idx_t idx_t;          // Type used for bit and word indices.
+typedef BitMap::bm_word_t bm_word_t;  // Element type of array that
+// represents the bitmap.
+private:
+BitMap _map;
+idx_t  _bits_per_slot;
+idx_t bit_index(idx_t slot_index, idx_t bit_within_slot_index) const {
+return slot_index * _bits_per_slot + bit_within_slot_index;
+}
+void verify_bit_within_slot_index(idx_t index) const {
+assert(index < _bits_per_slot, "bit_within_slot index out of bounds");
+}
+public:
+// Construction. bits_per_slot must be greater than 0.
+BitMap2D(bm_word_t* map, idx_t size_in_slots, idx_t bits_per_slot);
+// Allocates necessary data structure in resource area. bits_per_slot must be greater than 0.
+BitMap2D(idx_t size_in_slots, idx_t bits_per_slot);
+idx_t size_in_bits() {
+return _map.size();
+}
+// Returns number of full slots that have been allocated
+idx_t size_in_slots() {
+// Round down
+return _map.size() / _bits_per_slot;
+}
+bool is_valid_index(idx_t slot_index, idx_t bit_within_slot_index) {
+verify_bit_within_slot_index(bit_within_slot_index);
+return (bit_index(slot_index, bit_within_slot_index) < size_in_bits());
+}
+bool at(idx_t slot_index, idx_t bit_within_slot_index) const {
+verify_bit_within_slot_index(bit_within_slot_index);
+return _map.at(bit_index(slot_index, bit_within_slot_index));
+}
+void set_bit(idx_t slot_index, idx_t bit_within_slot_index) {
+verify_bit_within_slot_index(bit_within_slot_index);
+_map.set_bit(bit_index(slot_index, bit_within_slot_index));
+}
+void clear_bit(idx_t slot_index, idx_t bit_within_slot_index) {
+verify_bit_within_slot_index(bit_within_slot_index);
+_map.clear_bit(bit_index(slot_index, bit_within_slot_index));
+}
+void at_put(idx_t slot_index, idx_t bit_within_slot_index, bool value) {
+verify_bit_within_slot_index(bit_within_slot_index);
+_map.at_put(bit_index(slot_index, bit_within_slot_index), value);
+}
+void at_put_grow(idx_t slot_index, idx_t bit_within_slot_index, bool value) {
+verify_bit_within_slot_index(bit_within_slot_index);
+_map.at_put_grow(bit_index(slot_index, bit_within_slot_index), value);
+}
+void clear();
+};
+// Closure for iterating over BitMaps
+class BitMapClosure VALUE_OBJ_CLASS_SPEC {
+public:
+// Callback when bit in map is set.  Should normally return "true";
+// return of false indicates that the bitmap iteration should terminate.
+virtual bool do_bit(BitMap::idx_t offset) = 0;
+};
+#endif // SHARE_VM_UTILITIES_BITMAP_HPP

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/utilities/bitMap.hpp

src/share/vm/utilities/bitMap.hpp