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
|
/*******************************************************************\
Module: Unit tests of expression size/offset computation
Author: Michael Tautschnig
\*******************************************************************/
#include <testing-utils/use_catch.h>
#include <util/arith_tools.h>
#include <util/byte_operators.h>
#include <util/c_types.h>
#include <util/cmdline.h>
#include <util/config.h>
#include <util/namespace.h>
#include <util/pointer_offset_size.h>
#include <util/std_expr.h>
#include <util/symbol_table.h>
TEST_CASE("Build subexpression to access element at offset into array")
{
// this test does require a proper architecture to be set so that byte extract
// uses adequate endianness
cmdlinet cmdline;
config.set(cmdline);
symbol_tablet symbol_table;
namespacet ns(symbol_table);
const signedbv_typet t(32);
array_typet array_type(t, from_integer(2, size_type()));
symbol_exprt a("array", array_type);
{
const auto result = get_subexpression_at_offset(a, 0, t, ns);
REQUIRE(result.value() == index_exprt(a, from_integer(0, c_index_type())));
}
{
const auto result = get_subexpression_at_offset(a, 32 / 8, t, ns);
REQUIRE(result.value() == index_exprt(a, from_integer(1, c_index_type())));
}
{
const auto result =
get_subexpression_at_offset(a, from_integer(0, size_type()), t, ns);
REQUIRE(result.value() == index_exprt(a, from_integer(0, c_index_type())));
}
{
const auto result =
get_subexpression_at_offset(a, size_of_expr(t, ns).value(), t, ns);
REQUIRE(result.value() == index_exprt(a, from_integer(1, c_index_type())));
}
{
const signedbv_typet small_t(8);
const auto result = get_subexpression_at_offset(a, 1, small_t, ns);
REQUIRE(
result.value() == make_byte_extract(
index_exprt(a, from_integer(0, c_index_type())),
from_integer(1, c_index_type()),
small_t));
}
{
const signedbv_typet int16_t(16);
const auto result = get_subexpression_at_offset(a, 3, int16_t, ns);
// At offset 3 there are only 8 bits remaining in an element of type t so
// not enough to fill a 16 bit int, so this cannot be transformed in an
// index_exprt.
REQUIRE(
result.value() ==
make_byte_extract(a, from_integer(3, c_index_type()), int16_t));
}
}
TEST_CASE("Build subexpression to access element at offset into struct")
{
// this test does require a proper architecture to be set so that byte extract
// uses adequate endianness
cmdlinet cmdline;
config.set(cmdline);
symbol_tablet symbol_table;
namespacet ns(symbol_table);
const signedbv_typet t(32);
struct_typet st({{"foo", t}, {"bar", t}});
symbol_exprt s("struct", st);
{
const auto result = get_subexpression_at_offset(s, 0, t, ns);
REQUIRE(result.value() == member_exprt(s, "foo", t));
}
{
const auto result = get_subexpression_at_offset(s, 32 / 8, t, ns);
REQUIRE(result.value() == member_exprt(s, "bar", t));
}
{
const auto result =
get_subexpression_at_offset(s, from_integer(0, size_type()), t, ns);
REQUIRE(result.value() == member_exprt(s, "foo", t));
}
{
const auto result =
get_subexpression_at_offset(s, size_of_expr(t, ns).value(), t, ns);
REQUIRE(result.value() == member_exprt(s, "bar", t));
}
{
const signedbv_typet small_t(8);
const auto result = get_subexpression_at_offset(s, 1, small_t, ns);
REQUIRE(
result.value() ==
make_byte_extract(
member_exprt(s, "foo", t), from_integer(1, c_index_type()), small_t));
}
}
|
