libcxxabi/test/dynamic_cast.pass.cpp

   1 //===----------------------------------------------------------------------===//
   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 // PR33425 and PR33487 are not fixed until the dylib shipped with macOS 10.15
  10 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.14
  11
  12 // PR33439 isn't fixed until the dylib shipped with macOS 10.14
  13 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
  14
  15 #include <cassert>
  16
  17 // This test explicitly tests dynamic cast with types that have inaccessible
  18 // bases.
  19 #if defined(__clang__)
  20 #   pragma clang diagnostic ignored "-Winaccessible-base"
  21 #elif defined(__GNUC__)
  22 #   pragma GCC diagnostic ignored "-Winaccessible-base"
  23 #endif
  24
  25 typedef char Pad1[43981];
  26 typedef char Pad2[34981];
  27 typedef char Pad3[93481];
  28 typedef char Pad4[13489];
  29 typedef char Pad5[81349];
  30 typedef char Pad6[34819];
  31 typedef char Pad7[3489];
  32
  33 namespace t1
  34 {
  35
  36 // PR33425
  37 struct C3 { virtual ~C3() {} Pad1 _; };
  38 struct C5 : protected virtual C3 { Pad2 _; };
  39 struct C6 : virtual C5 { Pad3 _; };
  40 struct C7 : virtual C3 { Pad4 _; };
  41 struct C9 : C6, C7 { Pad5 _; };
  42
  43 C9 c9;
  44 C3 *c3 = &c9;
  45
  46 void test()
  47 {
  48     assert(dynamic_cast<C3*>(c3) == static_cast<C3*>(&c9));
  49     assert(dynamic_cast<C5*>(c3) == static_cast<C5*>(&c9));
  50     assert(dynamic_cast<C6*>(c3) == static_cast<C6*>(&c9));
  51     assert(dynamic_cast<C7*>(c3) == static_cast<C7*>(&c9));
  52     assert(dynamic_cast<C9*>(c3) == static_cast<C9*>(&c9));
  53 }
  54
  55 }  // t1
  56
  57 namespace t2
  58 {
  59
  60 // PR33425
  61 struct Src { virtual ~Src() {} Pad1 _; };
  62 struct Mask : protected virtual Src { Pad2 _; };
  63 struct Dest : Mask { Pad3 _; };
  64 struct Root : Dest, virtual Src { Pad4 _; };
  65
  66 Root root;
  67 Src *src = &root;
  68
  69 void test()
  70 {
  71     assert(dynamic_cast<Src*>(src) == static_cast<Src*>(&root));
  72     assert(dynamic_cast<Mask*>(src) == static_cast<Mask*>(&root));
  73     assert(dynamic_cast<Dest*>(src) == static_cast<Dest*>(&root));
  74     assert(dynamic_cast<Root*>(src) == static_cast<Root*>(&root));
  75 }
  76
  77 }  // t2
  78
  79 namespace t3
  80 {
  81
  82 // PR33487
  83 struct Class1 { virtual ~Class1() {} Pad1 _; };
  84 struct Shared : virtual Class1 { Pad2 _; };
  85 struct Class6 : virtual Shared { Pad3 _; };
  86 struct Left : Class6 { Pad4 _; };
  87 struct Right : Class6 { Pad5 _; };
  88 struct Main : Left, Right { Pad6 _; };
  89
  90 Main m;
  91 Class1 *c1 = &m;
  92
  93 void test()
  94 {
  95     assert(dynamic_cast<Class1*>(c1) == static_cast<Class1*>(&m));
  96     assert(dynamic_cast<Shared*>(c1) == static_cast<Shared*>(&m));
  97     assert(dynamic_cast<Class6*>(c1) == 0);
  98     assert(dynamic_cast<Left*>(c1) == static_cast<Left*>(&m));
  99     assert(dynamic_cast<Right*>(c1) == static_cast<Right*>(&m));
 100     assert(dynamic_cast<Main*>(c1) == static_cast<Main*>(&m));
 101 }
 102
 103 }  // t3
 104
 105 namespace t4
 106 {
 107
 108 // PR33439
 109 struct C2 { virtual ~C2() {} Pad1 _; };
 110 struct C3 { virtual ~C3() {} Pad2 _; };
 111 struct C4 : C3 { Pad3 _; };
 112 struct C8 : C2, virtual C4 { Pad4 _; };
 113 struct C9 : C4, C8 { Pad5 _; };
 114
 115 C9 c9;
 116 C2 *c2 = &c9;
 117
 118 void test()
 119 {
 120     assert(dynamic_cast<C2*>(c2) == static_cast<C2*>(&c9));
 121     assert(dynamic_cast<C3*>(c2) == 0);
 122     assert(dynamic_cast<C4*>(c2) == 0);
 123     assert(dynamic_cast<C8*>(c2) == static_cast<C8*>(&c9));
 124     assert(dynamic_cast<C9*>(c2) == static_cast<C9*>(&c9));
 125 }
 126
 127 }  // t4
 128
 129 namespace t5
 130 {
 131
 132 // PR33439
 133 struct Dummy { virtual ~Dummy() {} Pad1 _; };
 134 struct Src { virtual ~Src() {} Pad2 _; };
 135 struct Dest : Dummy { Pad3 _; };
 136 struct A1 : Dest { Pad4 _; };
 137 struct A2 : Dest { Pad5 _; };
 138 struct Root : Src, A1, A2 { Pad6 _; };
 139
 140 Root root;
 141 Src *src = &root;
 142
 143 void test()
 144 {
 145     assert(dynamic_cast<Dummy*>(src) == 0);
 146     assert(dynamic_cast<Src*>(src) == static_cast<Src*>(&root));
 147     assert(dynamic_cast<Dest*>(src) == 0);
 148     assert(dynamic_cast<A1*>(src) == static_cast<A1*>(&root));
 149     assert(dynamic_cast<A2*>(src) == static_cast<A2*>(&root));
 150 }
 151
 152 }  // t5
 153
 154 int main(int, char**)
 155 {
 156     t1::test();
 157     t2::test();
 158     t3::test();
 159     t4::test();
 160     t5::test();
 161
 162     return 0;
 163 }