[llvm-bugs] [Bug 44372] ClangCl: windows structured exception handling crash at the runtime

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Dec 24 13:00:01 PST 2019


Reid Kleckner <rnk at google.com> changed:

           What    |Removed                     |Added
         Resolution|---                         |DUPLICATE
                 CC|                            |rnk at google.com
             Status|NEW                         |RESOLVED

--- Comment #1 from Reid Kleckner <rnk at google.com> ---
This is a non-call exception, which LLVM cannot catch in the same frame. This
is working-as-designed. I recently wrote up the current the state here:

Pasted below:
This is currently working-as-designed, and documented:
"Asynchronous Exceptions (SEH): Partial. Structured exceptions (__try /
__except / __finally) mostly work on x86 and x64. LLVM does not model
asynchronous exceptions, so it is currently impossible to catch an asynchronous
exception generated in the same frame as the catching __try."

It was brought up recently and (hopefully) clarified here:
"the important thing to understand is that LLVM is currently incapable of
representing non-call instructions that might throw an exception."

There may be some future effort to implement support for non-call exceptions,
but to my knowledge, nobody has started and there is no timeline.

*** This bug has been marked as a duplicate of bug 1269 ***

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