1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/* Copyright (c) 2003, 2013, Oracle and/or its affiliates
Copyright (c) 2009, 2013, Monty Program Ab.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/*
Implementation of a bitmap type.
The idea with this is to be able to handle any constant number of bits but
also be able to use 32 or 64 bits bitmaps very efficiently
*/
#ifndef SQL_BITMAP_INCLUDED
#define SQL_BITMAP_INCLUDED
#include <my_sys.h>
#include <my_bitmap.h>
template <uint default_width> class Bitmap
{
MY_BITMAP map;
uint32 buffer[(default_width+31)/32];
public:
Bitmap() { init(); }
Bitmap(const Bitmap& from) { *this=from; }
explicit Bitmap(uint prefix_to_set) { init(prefix_to_set); }
void init() { my_bitmap_init(&map, buffer, default_width, 0); }
void init(uint prefix_to_set) { init(); set_prefix(prefix_to_set); }
uint length() const { return default_width; }
Bitmap& operator=(const Bitmap& map2)
{
init();
memcpy(buffer, map2.buffer, sizeof(buffer));
return *this;
}
void set_bit(uint n) { bitmap_set_bit(&map, n); }
void clear_bit(uint n) { bitmap_clear_bit(&map, n); }
void set_prefix(uint n) { bitmap_set_prefix(&map, n); }
void set_all() { bitmap_set_all(&map); }
void clear_all() { bitmap_clear_all(&map); }
void intersect(Bitmap& map2) { bitmap_intersect(&map, &map2.map); }
void intersect(ulonglong map2buff)
{
// Use a spearate temporary buffer, as bitmap_init() clears all the bits.
ulonglong buf2;
MY_BITMAP map2;
my_bitmap_init(&map2, (uint32 *) &buf2, sizeof(ulonglong) * 8, 0);
// Store the original bits.
if (sizeof(ulonglong) >= 8)
{
int8store(const_cast<uchar *>(static_cast<uchar *>
(static_cast<void *>(&buf2))),
map2buff);
}
else
{
DBUG_ASSERT(sizeof(buffer) >= 4);
int4store(const_cast<uchar *>(static_cast<uchar *>
(static_cast<void *>(&buf2))),
static_cast<uint32>(map2buff));
}
bitmap_intersect(&map, &map2);
}
/* Use highest bit for all bits above sizeof(ulonglong)*8. */
void intersect_extended(ulonglong map2buff)
{
intersect(map2buff);
if (map.n_bits > sizeof(ulonglong) * 8)
bitmap_set_above(&map, sizeof(ulonglong),
MY_TEST(map2buff & (1LL << (sizeof(ulonglong) * 8 - 1))));
}
void subtract(Bitmap& map2) { bitmap_subtract(&map, &map2.map); }
void merge(Bitmap& map2) { bitmap_union(&map, &map2.map); }
bool is_set(uint n) const { return bitmap_is_set(&map, n); }
bool is_prefix(uint n) const { return bitmap_is_prefix(&map, n); }
bool is_clear_all() const { return bitmap_is_clear_all(&map); }
bool is_set_all() const { return bitmap_is_set_all(&map); }
bool is_subset(const Bitmap& map2) const { return bitmap_is_subset(&map, &map2.map); }
bool is_overlapping(const Bitmap& map2) const { return bitmap_is_overlapping(&map, &map2.map); }
bool operator==(const Bitmap& map2) const { return bitmap_cmp(&map, &map2.map); }
bool operator!=(const Bitmap& map2) const { return !(*this == map2); }
char *print(char *buf) const
{
char *s=buf;
const uchar *e=(uchar *)buffer, *b=e+sizeof(buffer)-1;
while (!*b && b>e)
b--;
if ((*s=_dig_vec_upper[*b >> 4]) != '0')
s++;
*s++=_dig_vec_upper[*b & 15];
while (--b>=e)
{
*s++=_dig_vec_upper[*b >> 4];
*s++=_dig_vec_upper[*b & 15];
}
*s=0;
return buf;
}
ulonglong to_ulonglong() const
{
if (sizeof(buffer) >= 8)
return uint8korr(static_cast<const uchar *>
(static_cast<const void *>(buffer)));
DBUG_ASSERT(sizeof(buffer) >= 4);
return (ulonglong)
uint4korr(static_cast<const uchar *>
(static_cast<const void *>(buffer)));
}
uint bits_set()
{
return bitmap_bits_set(&map);
}
class Iterator
{
Bitmap ↦
uint no;
public:
Iterator(Bitmap<default_width> &map2): map(map2), no(0) {}
int operator++(int) {
if (no == default_width) return BITMAP_END;
while (!map.is_set(no))
{
if ((++no) == default_width) return BITMAP_END;
}
return no ++;
}
enum { BITMAP_END= default_width };
};
};
/* An iterator to quickly walk over bits in unlonglong bitmap. */
class Table_map_iterator
{
ulonglong bmp;
uint no;
public:
Table_map_iterator(ulonglong t) : bmp(t), no(0) {}
int next_bit()
{
static const char last_bit[16]= {32, 0, 1, 0,
2, 0, 1, 0,
3, 0, 1, 0,
2, 0, 1, 0};
uint bit;
while ((bit= last_bit[bmp & 0xF]) == 32)
{
no += 4;
bmp= bmp >> 4;
if (!bmp)
return BITMAP_END;
}
bmp &= ~(1LL << bit);
return no + bit;
}
int operator++(int) { return next_bit(); }
enum { BITMAP_END= 64 };
};
template <> class Bitmap<64>
{
ulonglong map;
public:
Bitmap<64>() { }
explicit Bitmap<64>(uint prefix_to_set) { set_prefix(prefix_to_set); }
void init() { }
void init(uint prefix_to_set) { set_prefix(prefix_to_set); }
uint length() const { return 64; }
void set_bit(uint n) { map|= ((ulonglong)1) << n; }
void clear_bit(uint n) { map&= ~(((ulonglong)1) << n); }
void set_prefix(uint n)
{
if (n >= length())
set_all();
else
map= (((ulonglong)1) << n)-1;
}
void set_all() { map=~(ulonglong)0; }
void clear_all() { map=(ulonglong)0; }
void intersect(Bitmap<64>& map2) { map&= map2.map; }
void intersect(ulonglong map2) { map&= map2; }
void intersect_extended(ulonglong map2) { map&= map2; }
void subtract(Bitmap<64>& map2) { map&= ~map2.map; }
void merge(Bitmap<64>& map2) { map|= map2.map; }
bool is_set(uint n) const { return MY_TEST(map & (((ulonglong) 1) << n)); }
bool is_prefix(uint n) const { return map == (((ulonglong)1) << n)-1; }
bool is_clear_all() const { return map == (ulonglong)0; }
bool is_set_all() const { return map == ~(ulonglong)0; }
bool is_subset(const Bitmap<64>& map2) const { return !(map & ~map2.map); }
bool is_overlapping(const Bitmap<64>& map2) const { return (map & map2.map)!= 0; }
bool operator==(const Bitmap<64>& map2) const { return map == map2.map; }
char *print(char *buf) const { longlong2str(map,buf,16); return buf; }
ulonglong to_ulonglong() const { return map; }
class Iterator : public Table_map_iterator
{
public:
Iterator(Bitmap<64> &map2) : Table_map_iterator(map2.map) {}
};
uint bits_set()
{
//TODO: use my_count_bits()
uint res= 0, i= 0;
for (; i < 64 ; i++)
{
if (map & ((ulonglong)1<<i))
res++;
}
return res;
}
};
#endif /* SQL_BITMAP_INCLUDED */
|
