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digitalmars.D.ldc - Win64 exception support?

reply "kinke" <noone hotmail.com> writes:
Hey guys,

what's currently missing for working exception handling under 
Win64?
https://github.com/ldc-developers/ldc/issues/166 suggests LLVM 
3.3 provides at least preliminary support. What else do we need? 
I'd like to help, but I need some hints...

Thanks and keep it up!
Feb 10 2013
next sibling parent "David Nadlinger" <see klickverbot.at> writes:
On Sunday, 10 February 2013 at 22:16:17 UTC, kinke wrote:

 https://github.com/ldc-developers/ldc/issues/166 suggests LLVM 
 3.3 provides at least preliminary support. What else do we 
 need? I'd like to help, but I need some hints...


As far as I know (I haven't really been following the 
llvm-commits list lately), the only thing that already made its 
way into the LLVM SVN is the part of the patch that adds support 
for the exception tables to the COFF file dumping tool.

I think Kai also did some work on the other parts of the patches 

don't know if he has been able to make much progress yet.

David
Feb 10 2013
prev sibling parent reply "Kai Nacke" <kai.nacke redstar.de> writes:
On Sunday, 10 February 2013 at 22:16:17 UTC, kinke wrote:

 Hey guys,

 what's currently missing for working exception handling under 
 Win64?
 https://github.com/ldc-developers/ldc/issues/166 suggests LLVM 
 3.3 provides at least preliminary support. What else do we 
 need? I'd like to help, but I need some hints...

 Thanks and keep it up!


The code to generate the EH data is linked to the issue. (Just 
give me a hint if you can't apply it cleanly. I update the patch 
then.)

There are (at least!) 2 bugs left:
- the EH personality function is hard coded. IMHO this is easy to 
change.
- the code generated by LLVM does not always conform to the WinABI

The last point is serious. E.g. the WinABI states that all 
integers are passed as 64-bit values and expect that the whole 
64-bit register is saved on the stack. In contrast, LLVM reserves 
and stores only 32-bit values for 32-bit wide parameters. This 
breaks the EH data generation.

Is these problems are solved then the implementation in druntime 
is still missing. Again, this should be easy and simply following 
the Dwarf EH solution from Linux.

Regards
Kai
Feb 10 2013
parent "Kai Nacke" <kai redstar.de> writes:
You could also try to get Setjmp/Longjmp exception handling to 
work. This would have the benefit to work in 32 bit mode, too.
That's not the best solution but my be easier to realize.

Regards
Kai
Feb 16 2013