| 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 | // UNSUPPORTED: c++03 |
| 11 | |
| 12 | // Test that the address of the exception object is properly aligned as required |
| 13 | // by the relevant ABI |
| 14 | |
| 15 | #include <cstdint> |
| 16 | #include <cassert> |
| 17 | #include <__cxxabi_config.h> |
| 18 | |
| 19 | #include <unwind.h> |
| 20 | |
| 21 | struct __attribute__((aligned)) AlignedType {}; |
| 22 | |
| 23 | // EHABI : 8-byte aligned |
| 24 | // Itanium: Largest supported alignment for the system |
| 25 | #if defined(_LIBCXXABI_ARM_EHABI) |
| 26 | # define EXPECTED_ALIGNMENT 8 |
| 27 | #else |
| 28 | # define EXPECTED_ALIGNMENT alignof(AlignedType) |
| 29 | #endif |
| 30 | |
| 31 | static_assert(alignof(_Unwind_Exception) == EXPECTED_ALIGNMENT, |
| 32 | "_Unwind_Exception is incorrectly aligned. This test is expected to fail"); |
| 33 | |
| 34 | struct MinAligned { }; |
| 35 | static_assert(alignof(MinAligned) == 1 && sizeof(MinAligned) == 1, ""); |
| 36 | |
| 37 | int main(int, char**) { |
| 38 | for (int i=0; i < 10; ++i) { |
| 39 | try { |
| 40 | throw MinAligned{}; |
| 41 | } catch (MinAligned const& ref) { |
| 42 | assert(reinterpret_cast<uintptr_t>(&ref) % EXPECTED_ALIGNMENT == 0); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 |