https://llvm.org/bugs/show_bug.cgi?id=27208
Bug ID: 27208
Summary: Make sure _Unwind_Exception object is double-word
aligned.
Product: libc++abi
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedb...@nondot.org
Reporter: ahata...@gmail.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
Itanium C++ ABI states that an _Unwind_Exception object should be double-word
(16B) aligned:
https://mentorembedded.github.io/cxx-abi/abi-eh.html#base-data
However, libc++abi doesn't guarantee it's 16-byte aligned, which caused
programs to crash when __cxa_allocate_exception returned an under-aligned
object.
r264998 fixed clang to lower the expected alignment on Darwin. We should
investigate whether other OSes need similar fixes and whether it's possible to
fix this in libc++abi (instead of in clang) without breaking the ABI.
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