libcxxabi/test/exception_object_alignment.2.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 // This test checks that the compiler does not make incorrect assumptions
  12 // about the alignment of the exception (only in that specific case, of
  13 // course).
  14 //
  15 // There was a bug where Clang would emit a call to memset assuming a 16-byte
  16 // aligned exception even when back-deploying to older Darwin systems where
  17 // exceptions are 8-byte aligned, which caused a segfault on those systems.
  18
  19 struct exception {
  20     exception() : x(0) { }
  21     exception(const exception&) = default;
  22     exception& operator=(const exception&) = default;
  23     virtual ~exception() { }
  24     int x;
  25 };
  26
  27 struct foo : exception { };
  28
  29 int main(int, char**) {
  30     try {
  31       throw foo();
  32     } catch (...) {
  33
  34     }
  35     return 0;
  36 }