Re: Modifying LJ to add a few math functions
- From: Mike Pall <mike-1307@xxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Fri, 26 Jul 2013 08:51:25 +0200
Emil Dotchevski wrote:
> What should I change in order to add functions to the math lib? I
> added the functions to lib_math.c like so:
>
> LJLIB_ASM(math_nmod) LJLIB_REC(math_nmod)
> {
> int x = lj_lib_checkint(L, 1);
> if (L->base+1 < L->top) {
> int y = lj_lib_checkint(L, 2);
> setintV(L->base-1, x%y);
> return FFH_RES(1);
> }
> return FFH_RETRY;
> }
Change this to:
LJLIB_CF(math_nmod)
{
int x = lj_lib_checkint(L, 1);
int y = lj_lib_checkint(L, 2);
setintV(L->top-1, x%y);
return 1;
}
> LJLIB_ASM(math_pi) LJLIB_REC(math_pi)
> {
Umm ... is this really a function? Because math.pi is already
defined. But it's a constant, not a function. Look for:
LJLIB_PUSH(3.14159265358979323846) LJLIB_SET(pi)
If you really, really want to turn that into a function, then
remove that definition and replace it with:
LJLIB_CF(math_pi)
{
setnumV(L->top++,3.14159265358979323846);
return 1;
}
[Note: this will only get you new functions for the interpreter.
Ok, so that's all you need on a (restricted) console. Hooking into
the JIT-compiler would be a bit more involved. This is just in case
someone else reads this posting out of context.]
--Mike
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