1 // 2 // Tests for 3 // template <typename U, typename Policy> 4 // bounded_ptr(bounded_ptr<U, Policy> const& other); 5 // 6 7 #include <libkern/c++/bounded_ptr.h> 8 #include <array> 9 #include <type_traits> 10 #include <darwintest.h> 11 #include <darwintest_utils.h> 12 #include "test_utils.h" 13 14 #define _assert(...) T_ASSERT_TRUE((__VA_ARGS__), # __VA_ARGS__) 15 16 struct Base { int i; }; 17 struct Derived : Base { }; 18 19 struct Base1 { int i; }; 20 struct Base2 { long l; }; 21 struct DerivedMultiple : Base1, Base2 { 22 DerivedMultiple(int i) : Base1{i}, Base2{i + 10} 23 { 24 } 25 }; 26 27 struct Unrelated { }; 28 29 struct dummy_policy1 { 30 static constexpr void 31 trap(char const*) 32 { 33 } 34 }; 35 struct dummy_policy2 { 36 static constexpr void 37 trap(char const*) 38 { 39 } 40 }; 41 42 template <typename Stored, typename From, typename To> 43 static void 44 tests() 45 { 46 std::array<Stored, 5> array = {Stored{0}, Stored{1}, Stored{2}, Stored{3}, Stored{4}}; 47 Stored* const ptr = array.begin() + 2; 48 49 { 50 test_bounded_ptr<From> const from(ptr, array.begin(), array.end()); 51 test_bounded_ptr<To> to = from; // conversion (implicit) 52 _assert(to.discard_bounds() == static_cast<To const*>(ptr)); 53 } 54 { 55 test_bounded_ptr<From> const from(ptr, array.begin(), array.end()); 56 test_bounded_ptr<To> to(from); // conversion (explicit) 57 _assert(to.discard_bounds() == static_cast<To const*>(ptr)); 58 } 59 { 60 test_bounded_ptr<From> const from(ptr, array.begin(), array.end()); 61 test_bounded_ptr<To> to{from}; // conversion (explicit) 62 _assert(to.discard_bounds() == static_cast<To const*>(ptr)); 63 } 64 { 65 test_bounded_ptr<From> const from(ptr, array.begin(), array.end()); 66 test_bounded_ptr<To> to = static_cast<test_bounded_ptr<To> >(from); // conversion (explicit) 67 _assert(to.discard_bounds() == static_cast<To const*>(ptr)); 68 } 69 70 // Test converting from a null pointer 71 { 72 test_bounded_ptr<From> from = nullptr; 73 test_bounded_ptr<To> to = from; // conversion (implicit) 74 _assert(to.unsafe_discard_bounds() == nullptr); 75 } 76 77 // Test with different policies 78 { 79 libkern::bounded_ptr<From, dummy_policy1> from(ptr, array.begin(), array.end()); 80 libkern::bounded_ptr<To, dummy_policy2> to = from; // conversion (implicit) 81 _assert(to.discard_bounds() == static_cast<To const*>(ptr)); 82 } 83 84 // T{0} T{1} T{2} T{3} T{4} <one-past-last> 85 // ^ ^ ^ 86 // | | | 87 // from begin end 88 { 89 test_bounded_ptr<From> const from(array.begin(), array.begin() + 1, array.end()); 90 test_bounded_ptr<To> to(from); 91 _assert(to.unsafe_discard_bounds() == static_cast<To const*>(array.begin())); 92 } 93 } 94 95 T_DECL(ctor_convert, "bounded_ptr.ctor.convert") { 96 tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Derived>(); 97 tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Derived const>(); 98 tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ Derived volatile>(); 99 tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ Derived const volatile>(); 100 101 tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base>(); 102 tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Base const>(); 103 tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ Base volatile>(); 104 tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ Base const volatile>(); 105 106 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base1>(); 107 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base1 const>(); 108 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple volatile, /*to*/ Base1 volatile>(); 109 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const volatile, /*to*/ Base1 const volatile>(); 110 111 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base2>(); 112 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base2 const>(); 113 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple volatile, /*to*/ Base2 volatile>(); 114 tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const volatile, /*to*/ Base2 const volatile>(); 115 116 tests</*stored*/ Derived, /*from*/ Derived, /*to*/ void>(); 117 tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ void const>(); 118 tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ void volatile>(); 119 tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ void const volatile>(); 120 121 // Make sure downcasts are disabled 122 static_assert(!std::is_convertible_v</*from*/ test_bounded_ptr<Base>, /*to*/ test_bounded_ptr<Derived> >); 123 static_assert(!std::is_convertible_v</*from*/ test_bounded_ptr<Base1>, /*to*/ test_bounded_ptr<DerivedMultiple> >); 124 static_assert(!std::is_convertible_v</*from*/ test_bounded_ptr<Base2>, /*to*/ test_bounded_ptr<DerivedMultiple> >); 125 static_assert(!std::is_convertible_v</*from*/ test_bounded_ptr<Base1>, /*to*/ test_bounded_ptr<Base2> >); 126 127 // Make sure const-casting away doesn't work 128 static_assert(!std::is_convertible_v</*from*/ test_bounded_ptr<Derived const>, /*to*/ test_bounded_ptr<Derived> >); 129 130 // Make sure casting to unrelated types doesn't work implicitly 131 static_assert(!std::is_convertible_v</*from*/ test_bounded_ptr<Derived>, /*to*/ test_bounded_ptr<char> >); 132 static_assert(!std::is_convertible_v</*from*/ test_bounded_ptr<Derived>, /*to*/ test_bounded_ptr<Unrelated> >); 133 static_assert(!std::is_convertible_v</*from*/ test_bounded_ptr<Base1>, /*to*/ test_bounded_ptr<Base2> >); 134 135 // Make sure even explicit conversion to unrelated types doesn't work 136 static_assert(!std::is_constructible_v</*to*/ test_bounded_ptr<char>, /*from*/ test_bounded_ptr<Derived> >); 137 static_assert(!std::is_constructible_v</*to*/ test_bounded_ptr<Unrelated>, /*from*/ test_bounded_ptr<Derived> >); 138 static_assert(!std::is_constructible_v</*to*/ test_bounded_ptr<Base2>, /*from*/ test_bounded_ptr<Base1> >); 139 140 // Make sure construction from a raw pointer doesn't work 141 static_assert(!std::is_constructible_v</*to*/ test_bounded_ptr<Derived>, /*from*/ Derived*>); 142 } 143