[LLVMbugs] [Bug 11468] Clang incorrectly handles exceptions in presence of stack aligned variables

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Dec 2 22:57:32 PST 2011


Bill Wendling <wendling at apple.com> changed:

           What    |Removed                     |Added
             Status|REOPENED                    |RESOLVED
         Resolution|                            |INVALID

--- Comment #5 from Bill Wendling <wendling at apple.com> 2011-12-03 00:57:32 CST ---
>From the EH ABI:

"The unwind runtime will likely have modified the stack (e.g. popped frames
from it) or register context, or landing pad code may have corrupted them. As a
result, the the caller of _Unwind_RaiseException can make no assumptions about
the state of its stack or registers."

So basically we cannot rely upon any register values being valid except for
those we know are restored via the unwinder. Sorry about that.

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