[cfe-dev] [LLVMdev] RFC: Replace __cxa_begin_catch/__cxa_end_catch with intrinsics

[Reid Kleckner]

This seems reasonable to me. Adding John explicitly...

On Mon, Feb 2, 2015 at 4:03 PM, Kaylor, Andrew <andrew.kaylor at intel.com>
wrote:

>  Hi all,
>
>
>
> I brought this up last week in an LLVMDev discussion of C++ EH support on
> Windows, but I thought I should float it again with a subject that would be
> less likely to be missed by people who don’t have a direct interest in
> Windows support.
>
>
>
> I would like to introduce two new intrinsics, llvm.eh.begincatch and
> llvm.eh.endcatch, to take the place of __cxa_begin_catch and
> __cxa_end_catch in the IR prior to the CodeGen prepare passes.  For the
> majority of platforms the intrinsics will be directly mapped to the
> existing function calls during one of the CodeGen prepare passes.  For
> MSVC-environment Windows targets there is no equivalent function call to be
> made, but these intrinsics will be extremely useful during the WinEHPrepare
> pass as a means of identifying the limits of catch-specific code.
>
>
>
> If there is a reason why I should not introduce intrinsics for this
> purpose, please give me feedback now.  Otherwise, I’m going to begin work
> on a patch to support this in the back end with the expectation that a
> corresponding change will be made in the clang front end when the intrinsic
> support is ready.
>
>
>
> Thanks,
>
> Andy
>
>
>
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