1  //===---------------- exception_object_alignment.pass.cpp -----------------===//
 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  
11  // The situation for the alignment of exception objects is badly messed up
12  // before macOS 10.14. The test fails on macOS 10.9 to 10.12, passes on macOS
13  // 10.13 (no investigation done), and passes afterwards. Just mark all the OSes
14  // before 10.14 as unsupported.
15  // UNSUPPORTED: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12|13}}
16  
17  // Check that the pointer __cxa_allocate_exception returns is aligned to the
18  // default alignment for the target architecture.
19  
20  #include <cassert>
21  #include <cstdint>
22  #include <cxxabi.h>
23  #include <type_traits>
24  #include <__cxxabi_config.h>
25  
26  struct S {
27    int a[4];
28  } __attribute__((aligned));
29  
30  int main(int, char**) {
31  #if !defined(_LIBCXXABI_ARM_EHABI)
32    void *p = __cxxabiv1::__cxa_allocate_exception(16);
33    auto i = reinterpret_cast<uintptr_t>(p);
34    auto a = std::alignment_of<S>::value;
35    assert(i % a == 0);
36    __cxxabiv1::__cxa_free_exception(p);
37  #endif
38    return 0;
39  }