libcxxabi/test/exception_object_alignment.pass.cpp

   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
  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: stdlib=apple-libc++ && 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 }