1// { dg-do run }
2
3// Copyright (C) 2001 Free Software Foundation, Inc.
4// Contributed by Nathan Sidwell 31 Jul 2001 <nathan@codesourcery.com>
5
6// Bug 3820. We were bit copying empty bases including the
7// padding. Which clobbers whatever they overlay.
8
9struct Empty {};
10
11struct Inter : Empty {};
12
13long now = 0;
14
15struct NonPod
16{
17  long m;
18
19  NonPod () {m = 0x12345678;}
20  NonPod (long m_) {m = m_;}
21  NonPod &operator= (NonPod const &src) {now = m; m = src.m; return *this;}
22  NonPod (NonPod const &src) {m = src.m;}
23};
24
25struct A : Inter
26{
27  A (long c) {m = c;}
28
29  NonPod m;
30};
31
32struct B
33{
34  Inter empty;
35  NonPod m;
36
37  B (long c) {m = c;}
38};
39
40struct C : NonPod, Inter
41{
42  C (long c) : NonPod (c), Inter () {}
43};
44
45int main ()
46{
47  A a (0x12131415);
48
49  long was = a.m.m;
50
51  a = 0x22232425;
52
53  if (was != now)
54    return 1;	// we copied the empty base which clobbered a.m.m's
55		// original value.
56
57  A b (0x32333435);
58  *(Inter *)&a = *(Inter *)&b;
59
60  if (a.m.m != 0x22232425)
61    return 2;	// we copied padding, which clobbered a.m.m
62
63  A b2 (0x32333435);
64  (Inter &)b2 = Inter ();
65  if (b2.m.m != 0x32333435)
66    return 2;	// we copied padding, which clobbered b2.m.m
67
68  B c (0x12131415);
69  was = c.m.m;
70  c = 0x22232425;
71  if (was != now)
72    return 3;
73
74  B d (0x32333435);
75  c.empty = d.empty;
76
77  if (c.m.m != 0x22232425)
78    return 4;
79
80  C e (0x32333435);
81
82  if (e.m != 0x32333435)
83    return 2;	// we copied padding
84
85  return 0;
86}
87