Re: [PATCH] Cygwin: strace: ignore GCC exceptions

[Ken Brown via Cygwin-patches]

On 8/20/2020 10:06 AM, Corinna Vinschen wrote:

Wouldn't it make sense to create a header defining the GCC status values
as in libgcc/unwind-seh.c and share this between exceptions.cc and
strace.cc?


Yes, thanks for the suggestion.  New patch(es) on the way.  I called the header 
"gcc_seh.h".  Feel free to suggest a better name.


Ken

Re: [PATCH] Cygwin: strace: ignore GCC exceptions

[Corinna Vinschen]

Hi Ken,

On Aug 20 09:54, Ken Brown via Cygwin-patches wrote:
> Any C++ app that calls 'throw' on 64-bit Cygwin results in an
> exception of type STATUS_GCC_THROW (0x20474343) generated by the C++
> runtime.  Don't pollute the strace output by printing information
> about this and other GCC exceptions.
> ---
>  winsup/utils/strace.cc | 7 +++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/winsup/utils/strace.cc b/winsup/utils/strace.cc
> index 9b6569a70..2b317012d 100644
> --- a/winsup/utils/strace.cc
> +++ b/winsup/utils/strace.cc
> @@ -790,6 +790,13 @@ proc_child (unsigned mask, FILE *ofile, pid_t pid)
>   case STATUS_BREAKPOINT:
>   case 0x406d1388:/* SetThreadName exception. */
> break;
> +#ifdef __x86_64__
> + case 0x20474343:/* STATUS_GCC_THROW. */
> + case 0x21474343:/* STATUS_GCC_UNWIND. */
> + case 0x22474343:/* STATUS_GCC_FORCED. */
> +   status = DBG_EXCEPTION_NOT_HANDLED;
> +   break;
> +#endif
>   default:
> status = DBG_EXCEPTION_NOT_HANDLED;
> if (ev.u.Exception.dwFirstChance)
> -- 
> 2.28.0

Wouldn't it make sense to create a header defining the GCC status values
as in libgcc/unwind-seh.c and share this between exceptions.cc and
strace.cc?


Thanks,
Corinna