Exceptions

[flyker]

Using MSVC i can write

__try {
     ...
 }
 __except( EXCEPTION_EXECUTE_HANDLER )
 {
    ...
 }

using Winelib i can write

__TRY {
     ...
 }
 __EXCEPT( ??? )
 {
    ...
 }

what can i use how EXCEPTION_EXECUTE_HANDLER ?

And i can't link this by using -lntdll

[Mike Hearn]

I believe structured exception handling is not implemented in Wine (it
requires support from gcc first).

On Wed, 2003-08-27 at 11:50, flyker wrote:
> Using MSVC i can write
>
> __try {
>      ...
>  }
>  __except( EXCEPTION_EXECUTE_HANDLER )
>  {
>     ...
>  }
>
> using Winelib i can write
>
> __TRY {
>      ...
>  }
>  __EXCEPT( ??? )
>  {
>     ...
>  }
>
> what can i use how EXCEPTION_EXECUTE_HANDLER ?
>
> And i can't link this by using -lntdll

[Steven Edwards]

--- Mike Hearn  wrote:
> I believe structured exception handling is not implemented in Wine (it
> requires support from gcc first).

There is a patch to give basic SEH support to gcc that has been developed for Mingw. The ReactOS
Project is also looking in to ways to implement SEH in the event Mingw and GCC main will not
accept the patches for this. I dont know all of the low level details of the plan except the if we
cannot get permission from the patent holder then we are going to have to implement SEH as a set
of macros. Our developers have a few good ideas of how to get around it in ReactOS and Mingw but I
dont about the WINE case.

http://www.geocrawler.com/archives/3/6016/2002/8/0/9368824/

Thanks
Steven

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[Mike Hearn]

I'm a bit confused. Clearly SEH *is* implemented in Wine, at least to
some extent, as you can watch exceptions being thrown and caught again
in the traces. I remember some threads talking about how it couldn't be
implemented, but, I've seen __TRY/__EXCEPT code in the Wine source.

What am I missing here?

On Wed, 2003-08-27 at 14:11, Steven Edwards wrote:
> --- Mike Hearn  wrote:
> > I believe structured exception handling is not implemented in Wine (it
> > requires support from gcc first).
>
> There is a patch to give basic SEH support to gcc that has been developed for Mingw. The ReactOS
> Project is also looking in to ways to implement SEH in the event Mingw and GCC main will not
> accept the patches for this. I dont know all of the low level details of the plan except the if we
> cannot get permission from the patent holder then we are going to have to implement SEH as a set
> of macros. Our developers have a few good ideas of how to get around it in ReactOS and Mingw but I
> dont about the WINE case.
>
> http://www.geocrawler.com/archives/3/6016/2002/8/0/9368824/
>
> Thanks
> Steven
>
> Do you Yahoo!?
> Yahoo! SiteBuilder - Free, easy-to-use web site design software
> http://sitebuilder.yahoo.com

[Dimitrie O. Paun]

On August 28, 2003 07:36 am, Mike Hearn wrote:
> I'm a bit confused. Clearly SEH *is* implemented in Wine, at least to
> some extent, as you can watch exceptions being thrown and caught again
> in the traces. I remember some threads talking about how it couldn't be
> implemented, but, I've seen __TRY/__EXCEPT code in the Wine source.
>
> What am I missing here?

The C-level support for __try/__except that can't be replicated using
macros (for things like return/goto out of the __try blocks). See the
thread on wine-devel from a few months back when Greg tried real hard
to simulate such a thing using gcc's support for inner functions without
much success.

[Alexandre Julliard]

"flyker"  writes:
> using Winelib i can write
>
> __TRY {
>      ...
>  }
>  __EXCEPT( ??? )
>  {
>     ...
>  }
>
> what can i use how EXCEPTION_EXECUTE_HANDLER ?

In general you need to create a function that returns a filter value
(EXCEPTION_EXECUTE_HANDLER or EXCEPTION_CONTINUE_SEARCH), and pass
that function name in __EXCEPT(). There are many examples of that in
the Wine source. As a simplification, if you want to execute the
handler in all cases (i.e. your filter function always returns
EXCEPTION_EXECUTE_HANDLER) then you can use NULL instead of a function
name.

[Gregory M. Turner]

On Wednesday 27 August 2003 03:04 pm, Alexandre Julliard wrote:
> "flyker"  writes:
> > using Winelib i can write
> >
> > __TRY {
> >      ...
> >  }
> >  __EXCEPT( ??? )
> >  {
> >     ...
> >  }
> >
> > what can i use how EXCEPTION_EXECUTE_HANDLER ?
>
> In general you need to create a function that returns a filter value
> (EXCEPTION_EXECUTE_HANDLER or EXCEPTION_CONTINUE_SEARCH), and pass
> that function name in __EXCEPT(). There are many examples of that in
> the Wine source. As a simplification, if you want to execute the
> handler in all cases (i.e. your filter function always returns
> EXCEPTION_EXECUTE_HANDLER) then you can use NULL instead of a function
> name.

There are limitations.  You must exit the try block using "normal" flow 
control.  That is, using return, goto, break, or continue to leave a __TRY 
block will cause disaster.  Otherwise they work OK.