libcxxabi/test/exception_object_alignment.pass.cpp

   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 // Check that the pointer __cxa_allocate_exception returns is aligned to the
  12 // default alignment for the target architecture.
  13
  14 #include <cassert>
  15 #include <cstdint>
  16 #include <cxxabi.h>
  17 #include <type_traits>
  18 #include <__cxxabi_config.h>
  19
  20 struct S {
  21   int a[4];
  22 } __attribute__((aligned));
  23
  24 int main() {
  25 #if !defined(_LIBCXXABI_ARM_EHABI)
  26   void *p = __cxxabiv1::__cxa_allocate_exception(16);
  27   auto i = reinterpret_cast<uintptr_t>(p);
  28   auto a = std::alignment_of<S>::value;
  29   assert(i % a == 0);
  30   __cxxabiv1::__cxa_free_exception(p);
  31 #endif
  32   return 0;
  33 }