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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | // // Tests for // T& operator*() const; // T* operator->() const; // #include <libkern/c++/bounded_ptr.h> #include <array> #include <darwintest.h> #include <darwintest_utils.h> #include "test_utils.h" #define _assert(...) T_ASSERT_TRUE((__VA_ARGS__), # __VA_ARGS__) struct T { int i; friend constexpr bool operator==(T const volatile& a, T const& b) { return a.i == b.i; } }; namespace { struct tracking_policy { static bool did_trap; static void trap(char const*) { did_trap = true; } }; bool tracking_policy::did_trap = false; } template <typename T, typename QualT> static void tests() { std::array<T, 5> array = {T{0}, T{1}, T{2}, T{3}, T{4}}; { // T{0} T{1} T{2} T{3} T{4} <one-past-last> // ^ ^ // | | // begin, ptr end test_bounded_ptr<QualT> ptr(array.begin() + 0, array.begin(), array.end()); QualT& ref = *ptr; _assert(ref == T{0}); _assert(&ref == &array[0]); _assert(ptr->i == 0); _assert(&ptr->i == &array[0].i); } { // T{0} T{1} T{2} T{3} T{4} <one-past-last> // ^ ^ ^ // | | | // begin ptr end test_bounded_ptr<QualT> ptr(array.begin() + 1, array.begin(), array.end()); QualT& ref = *ptr; _assert(ref == T{1}); _assert(&ref == &array[1]); _assert(ptr->i == 1); _assert(&ptr->i == &array[1].i); } { // T{0} T{1} T{2} T{3} T{4} <one-past-last> // ^ ^ ^ // | | | // begin ptr end test_bounded_ptr<QualT> ptr(array.begin() + 2, array.begin(), array.end()); QualT& ref = *ptr; _assert(ref == T{2}); _assert(&ref == &array[2]); _assert(ptr->i == 2); _assert(&ptr->i == &array[2].i); } { // T{0} T{1} T{2} T{3} T{4} <one-past-last> // ^ ^ ^ // | | | // begin ptr end test_bounded_ptr<QualT> ptr(array.begin() + 4, array.begin(), array.end()); QualT& ref = *ptr; _assert(ref == T{4}); _assert(&ref == &array[4]); _assert(ptr->i == 4); _assert(&ptr->i == &array[4].i); } // Make sure we don't trap when dereferencing an in-bounds pointer { // T{0} T{1} T{2} T{3} T{4} <one-past-last> // ^ ^ ^ // | | | // begin ptr end libkern::bounded_ptr<QualT, tracking_policy> ptr(array.begin() + 1, array.begin(), array.end()); tracking_policy::did_trap = false; (void)*ptr; (void)ptr->i; _assert(!tracking_policy::did_trap); } // Make sure we trap when dereferencing an out-of-bounds pointer { // T{0} T{1} T{2} T{3} T{4} <one-past-last> // ^ ^ ^ // | | | // begin end ptr libkern::bounded_ptr<QualT, tracking_policy> ptr(array.end() - 1, array.begin(), array.end() - 2); tracking_policy::did_trap = false; (void)*ptr; _assert(tracking_policy::did_trap); tracking_policy::did_trap = false; (void)ptr->i; _assert(tracking_policy::did_trap); } { // T{0} T{1} T{2} T{3} T{4} <one-past-last> // ^ ^ ^ // | | | // ptr begin end libkern::bounded_ptr<QualT, tracking_policy> ptr(array.begin(), array.begin() + 1, array.end()); tracking_policy::did_trap = false; (void)*ptr; _assert(tracking_policy::did_trap); tracking_policy::did_trap = false; (void)ptr->i; _assert(tracking_policy::did_trap); } { // T{0} T{1} T{2} T{3} T{4} <one-past-last> // ^ ^ ^ // | (just a bit off) | | // begin ptr end T* t3 = const_cast<T*>(array.begin() + 3); char* just_off = reinterpret_cast<char*>(t3) + 1; // 1 byte off libkern::bounded_ptr<QualT, tracking_policy> ptr(reinterpret_cast<QualT*>(just_off), array.begin(), array.end() - 1); tracking_policy::did_trap = false; (void)*ptr; _assert(tracking_policy::did_trap); tracking_policy::did_trap = false; (void)ptr->i; _assert(tracking_policy::did_trap); } } T_DECL(deref, "bounded_ptr.deref") { tests<T, T>(); tests<T, T const>(); tests<T, T volatile>(); tests<T, T const volatile>(); // Make sure that we don't hard-error in the definition of operator* // when instantiating a `bounded_ptr<cv-void>` test_bounded_ptr<void> p1; test_bounded_ptr<void const> p2; test_bounded_ptr<void volatile> p3; test_bounded_ptr<void const volatile> p4; } |