1 //===------------------------- dynamic_cast.pass.cpp ----------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include <cassert>
10 
11 // This test explicitly tests dynamic cast with types that have inaccessible
12 // bases.
13 #if defined(__clang__)
14 #   pragma clang diagnostic ignored "-Winaccessible-base"
15 #elif defined(__GNUC__)
16 #   pragma GCC diagnostic ignored "-Winaccessible-base"
17 #endif
18 
19 typedef char Pad1[43981];
20 typedef char Pad2[34981];
21 typedef char Pad3[93481];
22 typedef char Pad4[13489];
23 typedef char Pad5[81349];
24 typedef char Pad6[34819];
25 typedef char Pad7[3489];
26 
27 namespace t1
28 {
29 
30 // PR33425
31 struct C3 { virtual ~C3() {} Pad1 _; };
32 struct C5 : protected virtual C3 { Pad2 _; };
33 struct C6 : virtual C5 { Pad3 _; };
34 struct C7 : virtual C3 { Pad4 _; };
35 struct C9 : C6, C7 { Pad5 _; };
36 
37 C9 c9;
38 C3 *c3 = &c9;
39 
40 void test()
41 {
42     assert(dynamic_cast<C3*>(c3) == static_cast<C3*>(&c9));
43     assert(dynamic_cast<C5*>(c3) == static_cast<C5*>(&c9));
44     assert(dynamic_cast<C6*>(c3) == static_cast<C6*>(&c9));
45     assert(dynamic_cast<C7*>(c3) == static_cast<C7*>(&c9));
46     assert(dynamic_cast<C9*>(c3) == static_cast<C9*>(&c9));
47 }
48 
49 }  // t1
50 
51 namespace t2
52 {
53 
54 // PR33425
55 struct Src { virtual ~Src() {} Pad1 _; };
56 struct Mask : protected virtual Src { Pad2 _; };
57 struct Dest : Mask { Pad3 _; };
58 struct Root : Dest, virtual Src { Pad4 _; };
59 
60 Root root;
61 Src *src = &root;
62 
63 void test()
64 {
65     assert(dynamic_cast<Src*>(src) == static_cast<Src*>(&root));
66     assert(dynamic_cast<Mask*>(src) == static_cast<Mask*>(&root));
67     assert(dynamic_cast<Dest*>(src) == static_cast<Dest*>(&root));
68     assert(dynamic_cast<Root*>(src) == static_cast<Root*>(&root));
69 }
70 
71 }  // t2
72 
73 namespace t3
74 {
75 
76 // PR33487
77 struct Class1 { virtual ~Class1() {} Pad1 _; };
78 struct Shared : virtual Class1 { Pad2 _; };
79 struct Class6 : virtual Shared { Pad3 _; };
80 struct Left : Class6 { Pad4 _; };
81 struct Right : Class6 { Pad5 _; };
82 struct Main : Left, Right { Pad6 _; };
83 
84 Main m;
85 Class1 *c1 = &m;
86 
87 void test()
88 {
89     assert(dynamic_cast<Class1*>(c1) == static_cast<Class1*>(&m));
90     assert(dynamic_cast<Shared*>(c1) == static_cast<Shared*>(&m));
91     assert(dynamic_cast<Class6*>(c1) == 0);
92     assert(dynamic_cast<Left*>(c1) == static_cast<Left*>(&m));
93     assert(dynamic_cast<Right*>(c1) == static_cast<Right*>(&m));
94     assert(dynamic_cast<Main*>(c1) == static_cast<Main*>(&m));
95 }
96 
97 }  // t3
98 
99 namespace t4
100 {
101 
102 // PR33439
103 struct C2 { virtual ~C2() {} Pad1 _; };
104 struct C3 { virtual ~C3() {} Pad2 _; };
105 struct C4 : C3 { Pad3 _; };
106 struct C8 : C2, virtual C4 { Pad4 _; };
107 struct C9 : C4, C8 { Pad5 _; };
108 
109 C9 c9;
110 C2 *c2 = &c9;
111 
112 void test()
113 {
114     assert(dynamic_cast<C2*>(c2) == static_cast<C2*>(&c9));
115     assert(dynamic_cast<C3*>(c2) == 0);
116     assert(dynamic_cast<C4*>(c2) == 0);
117     assert(dynamic_cast<C8*>(c2) == static_cast<C8*>(&c9));
118     assert(dynamic_cast<C9*>(c2) == static_cast<C9*>(&c9));
119 }
120 
121 }  // t4
122 
123 namespace t5
124 {
125 
126 // PR33439
127 struct Dummy { virtual ~Dummy() {} Pad1 _; };
128 struct Src { virtual ~Src() {} Pad2 _; };
129 struct Dest : Dummy { Pad3 _; };
130 struct A1 : Dest { Pad4 _; };
131 struct A2 : Dest { Pad5 _; };
132 struct Root : Src, A1, A2 { Pad6 _; };
133 
134 Root root;
135 Src *src = &root;
136 
137 void test()
138 {
139     assert(dynamic_cast<Dummy*>(src) == 0);
140     assert(dynamic_cast<Src*>(src) == static_cast<Src*>(&root));
141     assert(dynamic_cast<Dest*>(src) == 0);
142     assert(dynamic_cast<A1*>(src) == static_cast<A1*>(&root));
143     assert(dynamic_cast<A2*>(src) == static_cast<A2*>(&root));
144 }
145 
146 }  // t5
147 
148 int main(int, char**)
149 {
150     t1::test();
151     t2::test();
152     t3::test();
153     t4::test();
154     t5::test();
155 
156     return 0;
157 }
158