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 <peterx@redhat.com>
9 */
10
11 #include "qemu/osdep.h"
12 #include "qemu/bitmap.h"
13
14 #define BMAP_SIZE 1024
15
check_bitmap_copy_with_offset(void)16 static void check_bitmap_copy_with_offset(void)
17 {
18 unsigned long *bmap1, *bmap2, *bmap3, total;
19
20 bmap1 = bitmap_new(BMAP_SIZE);
21 bmap2 = bitmap_new(BMAP_SIZE);
22 bmap3 = bitmap_new(BMAP_SIZE);
23
24 bmap1[0] = g_test_rand_int();
25 bmap1[1] = g_test_rand_int();
26 bmap1[2] = g_test_rand_int();
27 bmap1[3] = g_test_rand_int();
28 total = BITS_PER_LONG * 4;
29
30 /* Shift 115 bits into bmap2 */
31 bitmap_copy_with_dst_offset(bmap2, bmap1, 115, total);
32 /* Shift another 85 bits into bmap3 */
33 bitmap_copy_with_dst_offset(bmap3, bmap2, 85, total + 115);
34 /* Shift back 200 bits back */
35 bitmap_copy_with_src_offset(bmap2, bmap3, 200, total);
36
37 g_assert_cmpmem(bmap1, total / BITS_PER_LONG,
38 bmap2, total / BITS_PER_LONG);
39
40 bitmap_clear(bmap1, 0, BMAP_SIZE);
41 /* Set bits in bmap1 are 100-245 */
42 bitmap_set(bmap1, 100, 145);
43
44 /* Set bits in bmap2 are 60-205 */
45 bitmap_copy_with_src_offset(bmap2, bmap1, 40, 250);
46 g_assert_cmpint(find_first_bit(bmap2, 60), ==, 60);
47 g_assert_cmpint(find_next_zero_bit(bmap2, 205, 60), ==, 205);
48 g_assert(test_bit(205, bmap2) == 0);
49
50 /* Set bits in bmap3 are 135-280 */
51 bitmap_copy_with_dst_offset(bmap3, bmap1, 35, 250);
52 g_assert_cmpint(find_first_bit(bmap3, 135), ==, 135);
53 g_assert_cmpint(find_next_zero_bit(bmap3, 280, 135), ==, 280);
54 g_assert(test_bit(280, bmap3) == 0);
55
56 g_free(bmap1);
57 g_free(bmap2);
58 g_free(bmap3);
59 }
60
61 typedef void (*bmap_set_func)(unsigned long *map, long i, long len);
bitmap_set_case(bmap_set_func set_func)62 static void bitmap_set_case(bmap_set_func set_func)
63 {
64 unsigned long *bmap;
65 int offset;
66
67 bmap = bitmap_new(BMAP_SIZE);
68
69 /* Set one bit at offset in second word */
70 for (offset = 0; offset <= BITS_PER_LONG; offset++) {
71 bitmap_clear(bmap, 0, BMAP_SIZE);
72 set_func(bmap, BITS_PER_LONG + offset, 1);
73 g_assert_cmpint(find_first_bit(bmap, 2 * BITS_PER_LONG),
74 ==, BITS_PER_LONG + offset);
75 g_assert_cmpint(find_next_zero_bit(bmap,
76 3 * BITS_PER_LONG,
77 BITS_PER_LONG + offset),
78 ==, BITS_PER_LONG + offset + 1);
79 }
80
81 /* Both Aligned, set bits [BITS_PER_LONG, 3*BITS_PER_LONG] */
82 set_func(bmap, BITS_PER_LONG, 2 * BITS_PER_LONG);
83 g_assert_cmpuint(bmap[1], ==, -1ul);
84 g_assert_cmpuint(bmap[2], ==, -1ul);
85 g_assert_cmpint(find_first_bit(bmap, BITS_PER_LONG), ==, BITS_PER_LONG);
86 g_assert_cmpint(find_next_zero_bit(bmap, 3 * BITS_PER_LONG, BITS_PER_LONG),
87 ==, 3 * BITS_PER_LONG);
88
89 for (offset = 0; offset <= BITS_PER_LONG; offset++) {
90 bitmap_clear(bmap, 0, BMAP_SIZE);
91 /* End Aligned, set bits [BITS_PER_LONG - offset, 3*BITS_PER_LONG] */
92 set_func(bmap, BITS_PER_LONG - offset, 2 * BITS_PER_LONG + offset);
93 g_assert_cmpuint(bmap[1], ==, -1ul);
94 g_assert_cmpuint(bmap[2], ==, -1ul);
95 g_assert_cmpint(find_first_bit(bmap, BITS_PER_LONG),
96 ==, BITS_PER_LONG - offset);
97 g_assert_cmpint(find_next_zero_bit(bmap,
98 3 * BITS_PER_LONG,
99 BITS_PER_LONG - offset),
100 ==, 3 * BITS_PER_LONG);
101 }
102
103 for (offset = 0; offset <= BITS_PER_LONG; offset++) {
104 bitmap_clear(bmap, 0, BMAP_SIZE);
105 /* Start Aligned, set bits [BITS_PER_LONG, 3*BITS_PER_LONG + offset] */
106 set_func(bmap, BITS_PER_LONG, 2 * BITS_PER_LONG + offset);
107 g_assert_cmpuint(bmap[1], ==, -1ul);
108 g_assert_cmpuint(bmap[2], ==, -1ul);
109 g_assert_cmpint(find_first_bit(bmap, BITS_PER_LONG),
110 ==, BITS_PER_LONG);
111 g_assert_cmpint(find_next_zero_bit(bmap,
112 3 * BITS_PER_LONG + offset,
113 BITS_PER_LONG),
114 ==, 3 * BITS_PER_LONG + offset);
115 }
116
117 g_free(bmap);
118 }
119
check_bitmap_set(void)120 static void check_bitmap_set(void)
121 {
122 bitmap_set_case(bitmap_set);
123 bitmap_set_case(bitmap_set_atomic);
124 }
125
main(int argc,char ** argv)126 int main(int argc, char **argv)
127 {
128 g_test_init(&argc, &argv, NULL);
129
130 g_test_add_func("/bitmap/bitmap_copy_with_offset",
131 check_bitmap_copy_with_offset);
132 g_test_add_func("/bitmap/bitmap_set",
133 check_bitmap_set);
134
135 g_test_run();
136
137 return 0;
138 }
139