https://llvm.org/bugs/show_bug.cgi?id=24604
Bug ID: 24604
Summary: __cxa_allocate_exception returns under-aligned memory
in 32 bit builds
Product: libc++abi
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedb...@nondot.org
Reporter: e...@efcs.ca
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
In 32 bit builds with GNU unwind __cxa_exception is 16 byte aligned. However
the maximal alignment in 32 bit builds is 8 bytes. That means that the memory
returned from std::malloc is not suitably aligned to represent a
__cxa_exception and this causes undefined behavior.
We need to figure out the best way to get over-aligned memory from
__cxa_allocate_exception.
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