diff options
author | Eric Fiselier <eric@efcs.ca> | 2017-03-04 02:04:45 +0000 |
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committer | Eric Fiselier <eric@efcs.ca> | 2017-03-04 02:04:45 +0000 |
commit | aad059409f93f48058f669d730cb35ad7b84bb69 (patch) | |
tree | 9ed81b7357634d43cfdd134cb1f915e75de2daac /test | |
parent | da7d616fd2870e097eaa85bcec38b97a6d6dbde2 (diff) |
[libcxxabi] Fix alignment of allocated exceptions in 32 bit builds
Summary:
In 32 bit builds on a 64 bit system `std::malloc` does not return correctly aligned memory. This leads to undefined behavior.
This patch switches to using `posix_memalign` to allocate correctly aligned memory instead.
Reviewers: mclow.lists, danalbert, jroelofs, compnerd
Reviewed By: compnerd
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D25417
git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@296952 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r-- | test/test_exception_address_alignment.pass.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/test_exception_address_alignment.pass.cpp b/test/test_exception_address_alignment.pass.cpp new file mode 100644 index 0000000..5c5b4df --- /dev/null +++ b/test/test_exception_address_alignment.pass.cpp @@ -0,0 +1,28 @@ +//===----------------------------------------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is dual licensed under the MIT and the University of Illinois Open +// Source Licenses. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +// Test that the address of the exception object is properly aligned to the +// largest supported alignment for the system. + +#include <cstdint> +#include <cassert> + +struct __attribute__((aligned)) AlignedType {}; +struct MinAligned { }; +static_assert(alignof(MinAligned) == 1 && sizeof(MinAligned) == 1, ""); + +int main() { + for (int i=0; i < 10; ++i) { + try { + throw MinAligned{}; + } catch (MinAligned const& ref) { + assert(reinterpret_cast<uintptr_t>(&ref) % alignof(AlignedType) == 0); + } + } +} |