llvm dev - Nov 2009 - [LLVMdev] Unwinding through a native layer

On Wed, Nov 18, 2009 at 9:33 AM, Duncan Sands <baldrick at free.fr>
wrote:
> Hi Garrison,
>
>> - fc merely executes an unwind.
>
> the code generators do not know how to codegen unwind.  Only the
> interpreter has support for it.  Yes, this sucks.  You will need
> to call the libgcc unwind routine directly.
Really?  I thought the JIT supported exceptions via -enable-eh.

Reid

Reid Kleckner wrote:
> On Wed, Nov 18, 2009 at 9:33 AM, Duncan Sands <baldrick at free.fr>
wrote:
>> Hi Garrison,
>>
>>> - fc merely executes an unwind.
>> the code generators do not know how to codegen unwind.  Only the
>> interpreter has support for it.  Yes, this sucks.  You will need
>> to call the libgcc unwind routine directly.
> 
> Really?  I thought the JIT supported exceptions via -enable-eh.
You mean by lowering to setjmp/longjmp?  Maybe, I don't know.
It should be easy to find out by trying it.

Ciao,

Duncan.

> You mean by lowering to setjmp/longjmp?  Maybe, I don't know.
> It should be easy to find out by trying it.
No, with DWARF.  There's all this code in the JIT
(JITDwarfEmitter.cpp) to register the DWARF with libgcc.

Reid