test_exception_address_alignment.pass.cpp (1565B)
1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // UNSUPPORTED: libcxxabi-no-exceptions 11 // UNSUPPORTED: c++98, c++03 12 13 // The system unwind.h on OS X provides an incorrectly aligned _Unwind_Exception 14 // type. That causes these tests to fail. This XFAIL is my best attempt at 15 // working around this failure. 16 // XFAIL: darwin && libcxxabi-has-system-unwinder 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() { 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 }