size_classes.c revision e3195fa4a54344cf707d30e510e91ed43f5a8b84 
1#include "test/jemalloc_test.h"
2
3static size_t
4get_max_size_class(void)
5{
6	unsigned nhchunks;
7	size_t mib[4];
8	size_t sz, miblen, max_size_class;
9
10	sz = sizeof(unsigned);
11	assert_d_eq(mallctl("arenas.nhchunks", &nhchunks, &sz, NULL, 0), 0,
12	    "Unexpected mallctl() error");
13
14	miblen = sizeof(mib) / sizeof(size_t);
15	assert_d_eq(mallctlnametomib("arenas.hchunk.0.size", mib, &miblen), 0,
16	    "Unexpected mallctlnametomib() error");
17	mib[2] = nhchunks - 1;
18
19	sz = sizeof(size_t);
20	assert_d_eq(mallctlbymib(mib, miblen, &max_size_class, &sz, NULL, 0), 0,
21	    "Unexpected mallctlbymib() error");
22
23	return (max_size_class);
24}
25
26TEST_BEGIN(test_size_classes)
27{
28	size_t size_class, max_size_class;
29	szind_t index, max_index;
30
31	max_size_class = get_max_size_class();
32	max_index = size2index(max_size_class);
33
34	for (index = 0, size_class = index2size(index); index < max_index ||
35	    size_class < max_size_class; index++, size_class =
36	    index2size(index)) {
37		assert_true(index < max_index,
38		    "Loop conditionals should be equivalent; index=%u, "
39		    "size_class=%zu (%#zx)", index, size_class, size_class);
40		assert_true(size_class < max_size_class,
41		    "Loop conditionals should be equivalent; index=%u, "
42		    "size_class=%zu (%#zx)", index, size_class, size_class);
43
44		assert_u_eq(index, size2index(size_class),
45		    "size2index() does not reverse index2size(): index=%u -->"
46		    " size_class=%zu --> index=%u --> size_class=%zu", index,
47		    size_class, size2index(size_class),
48		    index2size(size2index(size_class)));
49		assert_zu_eq(size_class, index2size(size2index(size_class)),
50		    "index2size() does not reverse size2index(): index=%u -->"
51		    " size_class=%zu --> index=%u --> size_class=%zu", index,
52		    size_class, size2index(size_class),
53		    index2size(size2index(size_class)));
54
55		assert_u_eq(index+1, size2index(size_class+1),
56		    "Next size_class does not round up properly");
57
58		assert_zu_eq(size_class, (index > 0) ?
59		    s2u(index2size(index-1)+1) : s2u(1),
60		    "s2u() does not round up to size class");
61		assert_zu_eq(size_class, s2u(size_class-1),
62		    "s2u() does not round up to size class");
63		assert_zu_eq(size_class, s2u(size_class),
64		    "s2u() does not compute same size class");
65		assert_zu_eq(s2u(size_class+1), index2size(index+1),
66		    "s2u() does not round up to next size class");
67	}
68
69	assert_u_eq(index, size2index(index2size(index)),
70	    "size2index() does not reverse index2size()");
71	assert_zu_eq(max_size_class, index2size(size2index(max_size_class)),
72	    "index2size() does not reverse size2index()");
73
74	assert_zu_eq(size_class, s2u(index2size(index-1)+1),
75	    "s2u() does not round up to size class");
76	assert_zu_eq(size_class, s2u(size_class-1),
77	    "s2u() does not round up to size class");
78	assert_zu_eq(size_class, s2u(size_class),
79	    "s2u() does not compute same size class");
80}
81TEST_END
82
83TEST_BEGIN(test_overflow)
84{
85	size_t max_size_class;
86
87	max_size_class = get_max_size_class();
88
89	assert_u_ge(size2index(max_size_class+1), NSIZES,
90	    "size2index() should return >= NSIZES on overflow");
91	assert_u_ge(size2index(ZU(PTRDIFF_MAX)+1), NSIZES,
92	    "size2index() should return >= NSIZES on overflow");
93	assert_u_ge(size2index(SIZE_T_MAX), NSIZES,
94	    "size2index() should return >= NSIZES on overflow");
95
96	assert_zu_gt(s2u(max_size_class+1), HUGE_MAXCLASS,
97	    "s2u() should return > HUGE_MAXCLASS for unsupported size");
98	assert_zu_gt(s2u(ZU(PTRDIFF_MAX)+1), HUGE_MAXCLASS,
99	    "s2u() should return > HUGE_MAXCLASS for unsupported size");
100	assert_zu_eq(s2u(SIZE_T_MAX), 0,
101	    "s2u() should return 0 on overflow");
102}
103TEST_END
104
105int
106main(void)
107{
108
109	return (test(
110	    test_size_classes,
111	    test_overflow));
112}
113