[LLVMdev] Re-JITing a Function

[Jeffrey Yasskin]

On Tue, Oct 27, 2009 at 9:24 AM, Chris Lattner <clattner at apple.com> wrote:
>
> On Oct 27, 2009, at 9:18 AM, John Criswell wrote:
>
>> Dear LLVMers,
>>
>> Can the LLVM JIT, at run-time, take a function for which it has
>> already
>> generated native code, re-optimize it at the LLVM level, and then
>> re-generate its native code, replacing calls of the old function with
>> calls to the new function?
>>
>> I seem to recall that it could, but I need to make sure.
>
> Sure, ExecutionEngine::recompileAndRelinkFunction is your API.

But since that overwrites the beginning of the old version of the
function with a jump to the new version, be sure no threads are inside
there when you call it.