Re: LuaJit FFI with iOS
- From: Joe Riedel <joeriedel@xxxxxxxxxxx>
- To: "luajit@xxxxxxxxxxxxx" <luajit@xxxxxxxxxxxxx>
- Date: Mon, 24 Jun 2013 13:55:57 -0600
Hi Mike,
Does this mean that on targets that don't support JIT that the C API is faster
than the FFI?
Thanks,
-- Joe
Sent from my iPhone
On Jun 24, 2013, at 4:34, "Mike Pall" <mike-1306@xxxxxxxxxx> wrote:
Dominik Weinhold wrote:
> At the moment I am looking into getting it to run for an iOS app but I'm
> having trouble with the FFI. From what I know Apple does not allow any
> dynamic library in App-Store Apps. So I was wondering if there is a way to
> use the LuaJit FFI with static libraries so that apple will accept it?
Use a static struct holding function pointers on the C side. Pass
a pointer to that as a lightuserdata to Lua. Declare the same
struct on the Lua side and cast the received lightuserdata to a
pointer (or reference) to it.
[You probably know that Apple doesn't permit JIT-compilation,
which means you only get the fast LuaJIT interpreter. Alas, the
FFI is quite slow when only interpreted. This might be a problem
on iOS, if you plan to call C functions via the FFI in performance
sensitive contexts (millions of calls in a loop).]
--Mike
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