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. That causes these tests to 14 // fail with those SDKs. Note that we use the AppleClang version as a cheap 15 // proxy for the SDK version. 16 // XFAIL: apple-clang-11 && libcxxabi-has-system-unwinder 17 // XFAIL: apple-clang-10 && libcxxabi-has-system-unwinder 18 // XFAIL: apple-clang-9 && libcxxabi-has-system-unwinder 19 20 // Test that the address of the exception object is properly aligned as required 21 // by the relevant ABI 22 23 #include <cstdint> 24 #include <cassert> 25 #include <__cxxabi_config.h> 26 27 #include <unwind.h> 28 29 struct __attribute__((aligned)) AlignedType {}; 30 31 // EHABI : 8-byte aligned 32 // Itanium: Largest supported alignment for the system 33 #if defined(_LIBCXXABI_ARM_EHABI) 34 # define EXPECTED_ALIGNMENT 8 35 #else 36 # define EXPECTED_ALIGNMENT alignof(AlignedType) 37 #endif 38 39 static_assert(alignof(_Unwind_Exception) == EXPECTED_ALIGNMENT, 40 "_Unwind_Exception is incorrectly aligned. This test is expected to fail"); 41 42 struct MinAligned { }; 43 static_assert(alignof(MinAligned) == 1 && sizeof(MinAligned) == 1, ""); 44 45 int main() { 46 for (int i=0; i < 10; ++i) { 47 try { 48 throw MinAligned{}; 49 } catch (MinAligned const& ref) { 50 assert(reinterpret_cast<uintptr_t>(&ref) % EXPECTED_ALIGNMENT == 0); 51 } 52 } 53 } 54