ahatanak added a comment. In https://reviews.llvm.org/D33030#751187, @mehdi_amini wrote:
> Something still isn't clear to me: the issue IIUC is not with the > `unwindHeader` itself, but with the misaligned thrown object that is > allocated right after the __cxa_exception itself. Isn't it? > > Then are you aligning the `unwindHeader` field and by side-effect the size of > the __cxa_exception structure becomes aligned and then the thrown object will > be as well? Yes, that's correct. If field unwindHeader is annotated with the aligned attribute, both the field and struct __cxa_exception are aligned. As a result, the exception object that follows __cxa_exception is aligned too. If we annotate struct __cxa_exception with the attribute instead of annotating the field, the test case segfaults. It seems that this approach doesn't work because several places in cxa_exception.cpp assume the exception object immediately follows field unwindHeader (there are should be no paddings at the end of __cxa_exception). https://reviews.llvm.org/D33030 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
