libcxxabi/test/catch_multi_level_pointer.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 // UNSUPPORTED: no-exceptions
  10
  11 // 1b00fc5d8133 made it in the dylib in macOS 10.11
  12 // XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10}}
  13
  14 #include <cassert>
  15 #include <cstdio>
  16 #include <cstdlib>
  17
  18 // Roll our own assertion macro to get better error messages out of the tests.
  19 // In particular on systems that don't use __PRETTY_FUNCTION__ in assertions.
  20 #define my_assert(pred, msg) do_assert(pred, msg, __LINE__, __PRETTY_FUNCTION__)
  21
  22 void do_assert(bool assert_passed, const char* msg, int line, const char* func) {
  23   if (assert_passed)
  24     return;
  25   std::printf("%s:%d %s: Assertion Failed '%s'\n\n", __FILE__, line, func, msg);
  26   std::abort();
  27 }
  28
  29 struct A {};
  30 struct Base {};
  31 struct Derived : public Base {};
  32
  33 template <class To>
  34 bool test_conversion(To) { return true; }
  35
  36 template <class To>
  37 bool test_conversion(...) { return false; }
  38
  39 template <class Pointer>
  40 struct CreatePointer {
  41   Pointer operator()() const {
  42       return (Pointer)0;
  43   }
  44 };
  45
  46 template <class Tp>
  47 struct CreatePointer<Tp*> {
  48   Tp* operator()() const {
  49       return (Tp*)42;
  50   }
  51 };
  52
  53 template <class Throw, class Catch>
  54 void catch_pointer_test() {
  55   Throw throw_ptr = CreatePointer<Throw>()();
  56   // Use the compiler to determine if the exception of type Throw can be
  57   // implicitly converted to type Catch.
  58   const bool can_convert = test_conversion<Catch>(throw_ptr);
  59   try {
  60     throw throw_ptr;
  61     assert(false);
  62   } catch (Catch catch_ptr) {
  63     Catch catch2 = CreatePointer<Catch>()();
  64     my_assert(can_convert, "non-convertible type incorrectly caught");
  65     my_assert(catch_ptr == catch2,
  66               "Thrown pointer does not match caught ptr");
  67   } catch (...) {
  68     my_assert(!can_convert, "convertible type incorrectly not caught");
  69   }
  70 }
  71
  72 // Generate CV qualified pointer typedefs.
  73 template <class Tp, bool First = false>
  74 struct TestTypes {
  75   typedef Tp* Type;
  76   typedef Tp const* CType;
  77   typedef Tp volatile* VType;
  78   typedef Tp const volatile* CVType;
  79 };
  80
  81 // Special case for cv-qualifying a pointer-to-member without adding an extra
  82 // pointer to it.
  83 template <class Member, class Class>
  84 struct TestTypes<Member Class::*, true> {
  85   typedef Member (Class::*Type);
  86   typedef const Member (Class::*CType);
  87   typedef volatile Member (Class::*VType);
  88   typedef const volatile Member (Class::*CVType);
  89 };
  90
  91 template <class Throw, class Catch, int level, bool first = false>
  92 struct generate_tests_imp {
  93   typedef TestTypes<Throw, first> ThrowTypes;
  94   typedef TestTypes<Catch, first> CatchTypes;
  95   void operator()() {
  96       typedef typename ThrowTypes::Type Type;
  97       typedef typename ThrowTypes::CType CType;
  98       typedef typename ThrowTypes::VType VType;
  99       typedef typename ThrowTypes::CVType CVType;
 100
 101       run_catch_tests<Type>();
 102       run_catch_tests<CType>();
 103       run_catch_tests<VType>();
 104       run_catch_tests<CVType>();
 105   }
 106
 107   template <class ThrowTp>
 108   void run_catch_tests() {
 109       typedef typename CatchTypes::Type Type;
 110       typedef typename CatchTypes::CType CType;
 111       typedef typename CatchTypes::VType VType;
 112       typedef typename CatchTypes::CVType CVType;
 113
 114       catch_pointer_test<ThrowTp, Type>();
 115       catch_pointer_test<ThrowTp, CType>();
 116       catch_pointer_test<ThrowTp, VType>();
 117       catch_pointer_test<ThrowTp, CVType>();
 118
 119       generate_tests_imp<ThrowTp, Type, level-1>()();
 120       generate_tests_imp<ThrowTp, CType, level-1>()();
 121       generate_tests_imp<ThrowTp, VType, level-1>()();
 122       generate_tests_imp<ThrowTp, CVType, level-1>()();
 123   }
 124 };
 125
 126 template <class Throw, class Catch, bool first>
 127 struct generate_tests_imp<Throw, Catch, 0, first> {
 128   void operator()() {
 129       catch_pointer_test<Throw, Catch>();
 130   }
 131 };
 132
 133 template <class Throw, class Catch, int level>
 134 struct generate_tests : generate_tests_imp<Throw, Catch, level, true> {};
 135
 136 int main(int, char**)
 137 {
 138   generate_tests<int, int, 3>()();
 139   generate_tests<Base, Derived, 2>()();
 140   generate_tests<Derived, Base, 2>()();
 141   generate_tests<int, void, 2>()();
 142   generate_tests<void, int, 2>()();
 143
 144   generate_tests<int A::*, int A::*, 3>()();
 145   generate_tests<int A::*, void, 2>()();
 146   generate_tests<void, int A::*, 2>()();
 147
 148   return 0;
 149 }