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 // The <unwind.h> header provided in the SDK of older Xcodes used to provide 13 // an incorrectly aligned _Unwind_Exception type on non-ARM. That causes these 14 // tests to fail when running against a system libc++abi and libunwind that was 15 // compiled with an incorrect definition of _Unwind_Exception. 16 // XFAIL: stdlib=system && target={{.+}}-apple-macosx10.{{9|10|11|12}} 17 18 // Test that the address of the exception object is properly aligned as required 19 // by the relevant ABI 20 21 #include <cstdint> 22 #include <cassert> 23 #include <__cxxabi_config.h> 24 25 #include <unwind.h> 26 27 struct __attribute__((aligned)) AlignedType {}; 28 29 // EHABI : 8-byte aligned 30 // Itanium: Largest supported alignment for the system 31 #if defined(_LIBCXXABI_ARM_EHABI) 32 # define EXPECTED_ALIGNMENT 8 33 #else 34 # define EXPECTED_ALIGNMENT alignof(AlignedType) 35 #endif 36 37 static_assert(alignof(_Unwind_Exception) == EXPECTED_ALIGNMENT, 38 "_Unwind_Exception is incorrectly aligned. This test is expected to fail"); 39 40 struct MinAligned { }; 41 static_assert(alignof(MinAligned) == 1 && sizeof(MinAligned) == 1, ""); 42 43 int main(int, char**) { 44 for (int i=0; i < 10; ++i) { 45 try { 46 throw MinAligned{}; 47 } catch (MinAligned const& ref) { 48 assert(reinterpret_cast<uintptr_t>(&ref) % EXPECTED_ALIGNMENT == 0); 49 } 50 } 51 52 return 0; 53 } 54