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
|
/* Copyright 2016 MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include <limits>
#include "mongo/platform/overflow_arithmetic.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
using limits = std::numeric_limits<int64_t>;
#define assertArithOverflow(FN, LHS, RHS, EXPECT_OVERFLOW, EXPECTED_RESULT) \
do { \
const bool expectOverflow = EXPECT_OVERFLOW; \
int64_t result; \
ASSERT_EQ(expectOverflow, FN(LHS, RHS, &result)) << #FN "(" #LHS ", " #RHS; \
if (!expectOverflow) { \
ASSERT_EQ(EXPECTED_RESULT, result) << #FN "(" #LHS ", " #RHS " - >"; \
} \
} while (false)
#define assertMultiplyNoOverflow(LHS, RHS, EXPECTED) \
assertArithOverflow(mongoSignedMultiplyOverflow64, LHS, RHS, false, EXPECTED)
#define assertMultiplyWithOverflow(LHS, RHS) \
assertArithOverflow(mongoSignedMultiplyOverflow64, LHS, RHS, true, 0)
#define assertAddNoOverflow(LHS, RHS, EXPECTED) \
assertArithOverflow(mongoSignedAddOverflow64, LHS, RHS, false, EXPECTED)
#define assertAddWithOverflow(LHS, RHS) \
assertArithOverflow(mongoSignedAddOverflow64, LHS, RHS, true, 0)
#define assertSubtractNoOverflow(LHS, RHS, EXPECTED) \
assertArithOverflow(mongoSignedSubtractOverflow64, LHS, RHS, false, EXPECTED)
#define assertSubtractWithOverflow(LHS, RHS) \
assertArithOverflow(mongoSignedSubtractOverflow64, LHS, RHS, true, 0)
TEST(OverflowArithmetic, MultiplicationTests) {
assertMultiplyNoOverflow(0, limits::max(), 0);
assertMultiplyNoOverflow(0, limits::min(), 0);
assertMultiplyNoOverflow(1, limits::max(), limits::max());
assertMultiplyNoOverflow(1, limits::min(), limits::min());
assertMultiplyNoOverflow(-1, limits::max(), limits::min() + 1);
assertMultiplyNoOverflow(1000, 57, 57000);
assertMultiplyNoOverflow(1000, -57, -57000);
assertMultiplyNoOverflow(-1000, -57, 57000);
assertMultiplyNoOverflow(0x3fffffffffffffff, 2, 0x7ffffffffffffffe);
assertMultiplyNoOverflow(0x3fffffffffffffff, -2, -0x7ffffffffffffffe);
assertMultiplyNoOverflow(-0x3fffffffffffffff, -2, 0x7ffffffffffffffe);
assertMultiplyWithOverflow(-1, limits::min());
assertMultiplyWithOverflow(2, limits::max());
assertMultiplyWithOverflow(-2, limits::max());
assertMultiplyWithOverflow(2, limits::min());
assertMultiplyWithOverflow(-2, limits::min());
assertMultiplyWithOverflow(limits::min(), limits::max());
assertMultiplyWithOverflow(limits::max(), limits::max());
assertMultiplyWithOverflow(limits::min(), limits::min());
assertMultiplyWithOverflow(1LL << 62, 8);
assertMultiplyWithOverflow(-(1LL << 62), 8);
assertMultiplyWithOverflow(-(1LL << 62), -8);
}
TEST(OverflowArithmetic, AdditionTests) {
assertAddNoOverflow(0, limits::max(), limits::max());
assertAddNoOverflow(-1, limits::max(), limits::max() - 1);
assertAddNoOverflow(0, limits::min(), limits::min());
assertAddNoOverflow(1, limits::min(), limits::min() + 1);
assertAddNoOverflow(limits::max(), limits::min(), -1);
assertAddNoOverflow(1, 1, 2);
assertAddNoOverflow(-1, -1, -2);
assertAddWithOverflow(limits::max(), 1);
assertAddWithOverflow(limits::max(), limits::max());
assertAddWithOverflow(limits::min(), -1);
assertAddWithOverflow(limits::min(), limits::min());
}
TEST(OverflowArithmetic, SubtractionTests) {
assertSubtractNoOverflow(limits::max(), 0, limits::max());
assertSubtractNoOverflow(limits::max(), 1, limits::max() - 1);
assertSubtractNoOverflow(limits::min(), 0, limits::min());
assertSubtractNoOverflow(limits::min(), -1, limits::min() + 1);
assertSubtractNoOverflow(limits::max(), limits::max(), 0);
assertSubtractNoOverflow(limits::min(), limits::min(), 0);
assertSubtractWithOverflow(0, limits::min());
assertSubtractWithOverflow(limits::max(), -1);
assertSubtractWithOverflow(limits::max(), limits::min());
assertSubtractWithOverflow(limits::min(), 1);
assertSubtractWithOverflow(limits::min(), limits::max());
}
} // namespace
} // namespace mongo
|
