xnu-7195.50.7.100.1.tar.gz

[apple/xnu.git] / tests / bounded_ptr_src / reinterpret_cast.cpp

diff --git a/tests/bounded_ptr_src/reinterpret_cast.cpp b/tests/bounded_ptr_src/reinterpret_cast.cpp
new file mode 100644 (file)
index 0000000..0486ddc
--- /dev/null
+++ b/tests/bounded_ptr_src/reinterpret_cast.cpp
@@ -0,0 +1,86 @@
+//
+// Tests for
+//  template <typename T, typename U, typename Policy>
+//  bounded_ptr<T, Policy> reinterpret_pointer_cast(bounded_ptr<U, Policy> const& p) noexcept
+//
+
+#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 Base { int i; };
+struct Derived : Base { };
+
+struct Base1 { int i; };
+struct Base2 { long l; };
+struct DerivedMultiple : Base1, Base2 {
+       DerivedMultiple(int i) : Base1{i}, Base2{i + 10}
+       {
+       }
+};
+
+struct non_default_policy {
+       static constexpr void
+       trap(char const*)
+       {
+       }
+};
+
+template <typename Stored, typename From, typename To>
+static void
+tests()
+{
+       std::array<Stored, 5> array = {Stored{0}, Stored{1}, Stored{2}, Stored{3}, Stored{4}};
+
+       {
+               test_bounded_ptr<From> from(array.begin() + 2, array.begin(), array.end());
+               test_bounded_ptr<To> to = libkern::reinterpret_pointer_cast<To>(from);
+               _assert(to.discard_bounds() == reinterpret_cast<To const*>(from.discard_bounds()));
+       }
+
+       {
+               test_bounded_ptr<From> from(array.begin() + 2, array.begin(), array.end());
+               test_bounded_ptr<To> to = libkern::reinterpret_pointer_cast<To>(from);
+               _assert(to.discard_bounds() == reinterpret_cast<To const volatile*>(from.discard_bounds()));
+       }
+
+       // Test `reinterpret_pointer_cast`ing a null pointer
+       {
+               test_bounded_ptr<From> from(nullptr, nullptr, nullptr);
+               test_bounded_ptr<To> to = libkern::reinterpret_pointer_cast<To>(from);
+               _assert(to.unsafe_discard_bounds() == nullptr);
+       }
+
+       // Test with a non-default policy
+       {
+               libkern::bounded_ptr<From, non_default_policy> from(array.begin(), array.begin(), array.end());
+               libkern::bounded_ptr<To, non_default_policy> to = libkern::reinterpret_pointer_cast<To>(from);
+               _assert(to.discard_bounds() == reinterpret_cast<To const*>(from.discard_bounds()));
+       }
+}
+
+T_DECL(reinterpret_cast_, "bounded_ptr.reinterpret_cast") {
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ Base>();
+       tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ Base const>();
+       tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ Base volatile>();
+       tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ Base const volatile>();
+
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple, /*to*/ Base1>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const, /*to*/ Base1 const>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple volatile, /*to*/ Base1 volatile>();
+       tests</*stored*/ DerivedMultiple, /*from*/ DerivedMultiple const volatile, /*to*/ Base1 const volatile>();
+
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ void>();
+       tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ void const>();
+       tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ void volatile>();
+       tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ void const volatile>();
+
+       tests</*stored*/ Derived, /*from*/ Derived, /*to*/ char>();
+       tests</*stored*/ Derived, /*from*/ Derived const, /*to*/ char const>();
+       tests</*stored*/ Derived, /*from*/ Derived volatile, /*to*/ char volatile>();
+       tests</*stored*/ Derived, /*from*/ Derived const volatile, /*to*/ char const volatile>();
+}