https://bugs.llvm.org/show_bug.cgi?id=45346
Bug ID: 45346
Summary: AArch64 Windows EH UnwindHelp object not located at
fixed offset from FP
Product: libraries
Version: 9.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: unassignedb...@nondot.org
Reporter: daniel.framp...@microsoft.com
CC: arnaud.degrandmai...@arm.com,
llvm-bugs@lists.llvm.org, smithp...@googlemail.com,
ties.st...@arm.com
Created attachment 23289
--> https://bugs.llvm.org/attachment.cgi?id=23289&action=edit
Program that will crash if compiled and run on aarch64-pc-windows-msvc
On AArch64 Windows the UnwindHelp object used for EH is allocated as a normal
stack object.
If there are aligned objects in the frame, then the object will be subject to
alignment.
This means during exception handling the object can not be reliably found,
causing incorrect exception handling behavior.
Attaching simple C++ repro.
Bug exists in both LLVM9 and master.
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