[LLVMdev] unwind/invoke design

[Wesley W. Terpstra]

On Mon, Jun 15, 2009 at 7:08 PM, Aaron
Gray<aaronngray.lists at googlemail.com> wrote:
>> The documentation of unwind/invoke is quite clear and does exactly
>> what I need: unwinding the stack. I don't need it to carry an object
>> back. I don't need it to figure out what the type of the object is or
>> what catch() blocks it matches. I just need it to unwind the stack.
>> The rest is my job as a part of the runtime. Unfortunately, I have
>> learned that while this works with the bytecode evaluator, it doesn't
>> work with the JIT or native codegen [1].
>
> DWARF EH maybe what you want, it has zero overhead on normal calls and I
> believe it is built into LLVM's assemblers. A DWARF style EH is also built
> into the JIT too.

How do I tell llc to output dwarf-style 'unwnd' ? Both -enable-eh and
-enable-correct-eh-support compile 'unwind' to nothing on x86 with llc
v2.5.