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1 /*
2  * SPDX-License-Identifier: GPL-2.0-or-later
3  *
4  * Bitmap.c unit-tests.
5  *
6  * Copyright (C) 2019, Red Hat, Inc.
7  *
8  * Author: Peter Xu <[email protected]>
9  */
10
11 #include <stdlib.h>
12 #include "qemu/osdep.h"
13 #include "qemu/bitmap.h"
14
15 #define BMAP_SIZE  1024
16
17 static void check_bitmap_copy_with_offset(void)
18 {
19     unsigned long *bmap1, *bmap2, *bmap3, total;
20
21     bmap1 = bitmap_new(BMAP_SIZE);
22     bmap2 = bitmap_new(BMAP_SIZE);
23     bmap3 = bitmap_new(BMAP_SIZE);
24
25     bmap1[0] = random();
26     bmap1[1] = random();
27     bmap1[2] = random();
28     bmap1[3] = random();
29     total = BITS_PER_LONG * 4;
30
31     /* Shift 115 bits into bmap2 */
32     bitmap_copy_with_dst_offset(bmap2, bmap1, 115, total);
33     /* Shift another 85 bits into bmap3 */
34     bitmap_copy_with_dst_offset(bmap3, bmap2, 85, total + 115);
35     /* Shift back 200 bits back */
36     bitmap_copy_with_src_offset(bmap2, bmap3, 200, total);
37
38     g_assert_cmpmem(bmap1, total / BITS_PER_LONG,
39                     bmap2, total / BITS_PER_LONG);
40
41     bitmap_clear(bmap1, 0, BMAP_SIZE);
42     /* Set bits in bmap1 are 100-245 */
43     bitmap_set(bmap1, 100, 145);
44
45     /* Set bits in bmap2 are 60-205 */
46     bitmap_copy_with_src_offset(bmap2, bmap1, 40, 250);
47     g_assert_cmpint(find_first_bit(bmap2, 60), ==, 60);
48     g_assert_cmpint(find_next_zero_bit(bmap2, 205, 60), ==, 205);
49     g_assert(test_bit(205, bmap2) == 0);
50
51     /* Set bits in bmap3 are 135-280 */
52     bitmap_copy_with_dst_offset(bmap3, bmap1, 35, 250);
53     g_assert_cmpint(find_first_bit(bmap3, 135), ==, 135);
54     g_assert_cmpint(find_next_zero_bit(bmap3, 280, 135), ==, 280);
55     g_assert(test_bit(280, bmap3) == 0);
56
57     g_free(bmap1);
58     g_free(bmap2);
59     g_free(bmap3);
60 }
61
62 typedef void (*bmap_set_func)(unsigned long *map, long i, long len);
63 static void bitmap_set_case(bmap_set_func set_func)
64 {
65     unsigned long *bmap;
66     int offset;
67
68     bmap = bitmap_new(BMAP_SIZE);
69
70     /* Both Aligned, set bits [BITS_PER_LONG, 3*BITS_PER_LONG] */
71     set_func(bmap, BITS_PER_LONG, 2 * BITS_PER_LONG);
72     g_assert_cmpuint(bmap[1], ==, -1ul);
73     g_assert_cmpuint(bmap[2], ==, -1ul);
74     g_assert_cmpint(find_first_bit(bmap, BITS_PER_LONG), ==, BITS_PER_LONG);
75     g_assert_cmpint(find_next_zero_bit(bmap, 3 * BITS_PER_LONG, BITS_PER_LONG),
76                     ==, 3 * BITS_PER_LONG);
77
78     for (offset = 0; offset <= BITS_PER_LONG; offset++) {
79         bitmap_clear(bmap, 0, BMAP_SIZE);
80         /* End Aligned, set bits [BITS_PER_LONG - offset, 3*BITS_PER_LONG] */
81         set_func(bmap, BITS_PER_LONG - offset, 2 * BITS_PER_LONG + offset);
82         g_assert_cmpuint(bmap[1], ==, -1ul);
83         g_assert_cmpuint(bmap[2], ==, -1ul);
84         g_assert_cmpint(find_first_bit(bmap, BITS_PER_LONG),
85                         ==, BITS_PER_LONG - offset);
86         g_assert_cmpint(find_next_zero_bit(bmap,
87                                            3 * BITS_PER_LONG,
88                                            BITS_PER_LONG - offset),
89                         ==, 3 * BITS_PER_LONG);
90     }
91
92     for (offset = 0; offset <= BITS_PER_LONG; offset++) {
93         bitmap_clear(bmap, 0, BMAP_SIZE);
94         /* Start Aligned, set bits [BITS_PER_LONG, 3*BITS_PER_LONG + offset] */
95         set_func(bmap, BITS_PER_LONG, 2 * BITS_PER_LONG + offset);
96         g_assert_cmpuint(bmap[1], ==, -1ul);
97         g_assert_cmpuint(bmap[2], ==, -1ul);
98         g_assert_cmpint(find_first_bit(bmap, BITS_PER_LONG),
99                         ==, BITS_PER_LONG);
100         g_assert_cmpint(find_next_zero_bit(bmap,
101                                            3 * BITS_PER_LONG + offset,
102                                            BITS_PER_LONG),
103                         ==, 3 * BITS_PER_LONG + offset);
104     }
105
106     g_free(bmap);
107 }
108
109 static void check_bitmap_set(void)
110 {
111     bitmap_set_case(bitmap_set);
112     bitmap_set_case(bitmap_set_atomic);
113 }
114
115 int main(int argc, char **argv)
116 {
117     g_test_init(&argc, &argv, NULL);
118
119     g_test_add_func("/bitmap/bitmap_copy_with_offset",
120                     check_bitmap_copy_with_offset);
121     g_test_add_func("/bitmap/bitmap_set",
122                     check_bitmap_set);
123
124     g_test_run();
125
126     return 0;
127 }
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