blob: d20a55cf7fcaa4c72156c251973d43c49d922a8f (
plain)
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
|
// { dg-do run }
// Copyright (C) 2001 Free Software Foundation, Inc.
// Contributed by Nathan Sidwell 31 Jul 2001 <nathan@codesourcery.com>
// Bug 3820. We were bit copying empty bases including the
// padding. Which clobbers whatever they overlay.
struct Empty {};
struct Inter : Empty {};
long now = 0;
struct NonPod
{
long m;
NonPod () {m = 0x12345678;}
NonPod (long m_) {m = m_;}
NonPod &operator= (NonPod const &src) {now = m; m = src.m; return *this;}
NonPod (NonPod const &src) {m = src.m;}
};
struct A : Inter
{
A (long c) {m = c;}
NonPod m;
};
struct B
{
Inter empty;
NonPod m;
B (long c) {m = c;}
};
struct C : NonPod, Inter
{
C (long c) : NonPod (c), Inter () {}
};
int main ()
{
A a (0x12131415);
long was = a.m.m;
a = 0x22232425;
if (was != now)
return 1; // we copied the empty base which clobbered a.m.m's
// original value.
A b (0x32333435);
*(Inter *)&a = *(Inter *)&b;
if (a.m.m != 0x22232425)
return 2; // we copied padding, which clobbered a.m.m
A b2 (0x32333435);
(Inter &)b2 = Inter ();
if (b2.m.m != 0x32333435)
return 2; // we copied padding, which clobbered b2.m.m
B c (0x12131415);
was = c.m.m;
c = 0x22232425;
if (was != now)
return 3;
B d (0x32333435);
c.empty = d.empty;
if (c.m.m != 0x22232425)
return 4;
C e (0x32333435);
if (e.m != 0x32333435)
return 2; // we copied padding
return 0;
}
|
