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| author | Akira Hatanaka <ahatanaka@apple.com> | 2017-05-16 15:19:08 +0000 |
|---|---|---|
| committer | Akira Hatanaka <ahatanaka@apple.com> | 2017-05-16 15:19:08 +0000 |
| commit | 1089e7519494be608611df538b5d17ebf246304c (patch) | |
| tree | f299138be1d3f26b178e3b23c65a4dd1404a1c08 /src/cxa_noexception.cpp | |
| parent | fa4e00b737b2c91a3f4e7b676ee196792e06b3af (diff) | |
[libcxxabi] Align unwindHeader on a double-word boundary.
r276215 made a change to annotate _Unwind_Exception with attribute
"aligned" so that an exception object following field __cxa_exception
is sufficiently aligned. This fix hasn't been incorporated to unwind.h
on Darwin since it is an ABI breaking change.
Instead of annotating struct _Unwind_Exception with the attribute, this
commit annotates field unwindHeader of __cxa_exception. This ensures the
exception object is sufficiently aligned without breaking the ABI.
This recommits r302978 and r302981, which were reverted in r303016
because a libcxx test was failing on an AArch64 bot. I also modified the
libcxxabi test case to check the alignment of the pointer returned by
__cxa_allocate_exception rather than compiling the test with -O1 and
checking whether it segfaults.
rdar://problem/25364625
Differential Revision: https://reviews.llvm.org/D33030
git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@303175 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'src/cxa_noexception.cpp')
0 files changed, 0 insertions, 0 deletions